Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
Zach Brown | ec6b910 | 2007-07-11 10:00:37 -0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 20 | #include <linux/writeback.h> |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 21 | #include "hash.h" |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 22 | #include "crc32c.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 23 | #include "ctree.h" |
| 24 | #include "disk-io.h" |
| 25 | #include "print-tree.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 26 | #include "transaction.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 27 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 28 | #include "locking.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 29 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 30 | #define BLOCK_GROUP_DATA EXTENT_WRITEBACK |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 31 | #define BLOCK_GROUP_METADATA EXTENT_UPTODATE |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 32 | #define BLOCK_GROUP_SYSTEM EXTENT_NEW |
| 33 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 34 | #define BLOCK_GROUP_DIRTY EXTENT_DIRTY |
| 35 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 36 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
| 37 | btrfs_root *extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 38 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
| 39 | btrfs_root *extent_root); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 40 | static struct btrfs_block_group_cache * |
| 41 | __btrfs_find_block_group(struct btrfs_root *root, |
| 42 | struct btrfs_block_group_cache *hint, |
| 43 | u64 search_start, int data, int owner); |
Yan | d548ee5 | 2008-01-03 13:56:30 -0500 | [diff] [blame] | 44 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 45 | void maybe_lock_mutex(struct btrfs_root *root) |
| 46 | { |
| 47 | if (root != root->fs_info->extent_root && |
| 48 | root != root->fs_info->chunk_root && |
| 49 | root != root->fs_info->dev_root) { |
| 50 | mutex_lock(&root->fs_info->alloc_mutex); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | void maybe_unlock_mutex(struct btrfs_root *root) |
| 55 | { |
| 56 | if (root != root->fs_info->extent_root && |
| 57 | root != root->fs_info->chunk_root && |
| 58 | root != root->fs_info->dev_root) { |
| 59 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 60 | } |
| 61 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 62 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 63 | static int cache_block_group(struct btrfs_root *root, |
| 64 | struct btrfs_block_group_cache *block_group) |
| 65 | { |
| 66 | struct btrfs_path *path; |
| 67 | int ret; |
| 68 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 69 | struct extent_buffer *leaf; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 70 | struct extent_io_tree *free_space_cache; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 71 | int slot; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 72 | u64 last = 0; |
| 73 | u64 hole_size; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 74 | u64 first_free; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 75 | int found = 0; |
| 76 | |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 77 | if (!block_group) |
| 78 | return 0; |
| 79 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 80 | root = root->fs_info->extent_root; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 81 | free_space_cache = &root->fs_info->free_space_cache; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 82 | |
| 83 | if (block_group->cached) |
| 84 | return 0; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 85 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 86 | path = btrfs_alloc_path(); |
| 87 | if (!path) |
| 88 | return -ENOMEM; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 89 | |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 90 | path->reada = 2; |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 91 | /* |
| 92 | * we get into deadlocks with paths held by callers of this function. |
| 93 | * since the alloc_mutex is protecting things right now, just |
| 94 | * skip the locking here |
| 95 | */ |
| 96 | path->skip_locking = 1; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 97 | first_free = block_group->key.objectid; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 98 | key.objectid = block_group->key.objectid; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 99 | key.offset = 0; |
| 100 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 101 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 102 | if (ret < 0) |
| 103 | return ret; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 104 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
Yan | d548ee5 | 2008-01-03 13:56:30 -0500 | [diff] [blame] | 105 | if (ret < 0) |
| 106 | return ret; |
| 107 | if (ret == 0) { |
| 108 | leaf = path->nodes[0]; |
| 109 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 110 | if (key.objectid + key.offset > first_free) |
| 111 | first_free = key.objectid + key.offset; |
| 112 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 113 | while(1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 114 | leaf = path->nodes[0]; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 115 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 116 | if (slot >= btrfs_header_nritems(leaf)) { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 117 | ret = btrfs_next_leaf(root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 118 | if (ret < 0) |
| 119 | goto err; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 120 | if (ret == 0) { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 121 | continue; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 122 | } else { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 123 | break; |
| 124 | } |
| 125 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 126 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 127 | if (key.objectid < block_group->key.objectid) { |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 128 | goto next; |
| 129 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 130 | if (key.objectid >= block_group->key.objectid + |
| 131 | block_group->key.offset) { |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 132 | break; |
| 133 | } |
| 134 | |
| 135 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
| 136 | if (!found) { |
| 137 | last = first_free; |
| 138 | found = 1; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 139 | } |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 140 | if (key.objectid > last) { |
| 141 | hole_size = key.objectid - last; |
| 142 | set_extent_dirty(free_space_cache, last, |
| 143 | last + hole_size - 1, |
| 144 | GFP_NOFS); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 145 | } |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 146 | last = key.objectid + key.offset; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 147 | } |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 148 | next: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 149 | path->slots[0]++; |
| 150 | } |
| 151 | |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 152 | if (!found) |
| 153 | last = first_free; |
| 154 | if (block_group->key.objectid + |
| 155 | block_group->key.offset > last) { |
| 156 | hole_size = block_group->key.objectid + |
| 157 | block_group->key.offset - last; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 158 | set_extent_dirty(free_space_cache, last, |
| 159 | last + hole_size - 1, GFP_NOFS); |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 160 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 161 | block_group->cached = 1; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 162 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 163 | btrfs_free_path(path); |
| 164 | return 0; |
| 165 | } |
| 166 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 167 | struct btrfs_block_group_cache *btrfs_lookup_first_block_group(struct |
| 168 | btrfs_fs_info *info, |
| 169 | u64 bytenr) |
| 170 | { |
| 171 | struct extent_io_tree *block_group_cache; |
| 172 | struct btrfs_block_group_cache *block_group = NULL; |
| 173 | u64 ptr; |
| 174 | u64 start; |
| 175 | u64 end; |
| 176 | int ret; |
| 177 | |
| 178 | bytenr = max_t(u64, bytenr, |
| 179 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); |
| 180 | block_group_cache = &info->block_group_cache; |
| 181 | ret = find_first_extent_bit(block_group_cache, |
| 182 | bytenr, &start, &end, |
| 183 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
| 184 | BLOCK_GROUP_SYSTEM); |
| 185 | if (ret) { |
| 186 | return NULL; |
| 187 | } |
| 188 | ret = get_state_private(block_group_cache, start, &ptr); |
| 189 | if (ret) |
| 190 | return NULL; |
| 191 | |
| 192 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
| 193 | return block_group; |
| 194 | } |
| 195 | |
Chris Mason | 5276aed | 2007-06-11 21:33:38 -0400 | [diff] [blame] | 196 | struct btrfs_block_group_cache *btrfs_lookup_block_group(struct |
| 197 | btrfs_fs_info *info, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 198 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 199 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 200 | struct extent_io_tree *block_group_cache; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 201 | struct btrfs_block_group_cache *block_group = NULL; |
| 202 | u64 ptr; |
| 203 | u64 start; |
| 204 | u64 end; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 205 | int ret; |
| 206 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 207 | bytenr = max_t(u64, bytenr, |
| 208 | BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 209 | block_group_cache = &info->block_group_cache; |
| 210 | ret = find_first_extent_bit(block_group_cache, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 211 | bytenr, &start, &end, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 212 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
| 213 | BLOCK_GROUP_SYSTEM); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 214 | if (ret) { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 215 | return NULL; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 216 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 217 | ret = get_state_private(block_group_cache, start, &ptr); |
| 218 | if (ret) |
| 219 | return NULL; |
| 220 | |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 221 | block_group = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
Yan | 5cf6642 | 2007-11-16 14:57:09 -0500 | [diff] [blame] | 222 | if (block_group->key.objectid <= bytenr && bytenr < |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 223 | block_group->key.objectid + block_group->key.offset) |
| 224 | return block_group; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 225 | return NULL; |
| 226 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 227 | |
| 228 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 229 | { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 230 | return (cache->flags & bits) == bits; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | static int noinline find_search_start(struct btrfs_root *root, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 234 | struct btrfs_block_group_cache **cache_ret, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 235 | u64 *start_ret, u64 num, int data) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 236 | { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 237 | int ret; |
| 238 | struct btrfs_block_group_cache *cache = *cache_ret; |
Chris Mason | d7fc640 | 2008-02-18 12:12:38 -0500 | [diff] [blame] | 239 | struct extent_io_tree *free_space_cache; |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 240 | struct extent_state *state; |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 241 | u64 last; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 242 | u64 start = 0; |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 243 | u64 cache_miss = 0; |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 244 | u64 total_fs_bytes; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 245 | u64 search_start = *start_ret; |
Chris Mason | f84a8b3 | 2007-11-06 10:26:29 -0500 | [diff] [blame] | 246 | int wrapped = 0; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 247 | |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 248 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
Chris Mason | d7fc640 | 2008-02-18 12:12:38 -0500 | [diff] [blame] | 249 | free_space_cache = &root->fs_info->free_space_cache; |
| 250 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 251 | if (!cache) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 252 | goto out; |
Chris Mason | f84a8b3 | 2007-11-06 10:26:29 -0500 | [diff] [blame] | 253 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 254 | again: |
| 255 | ret = cache_block_group(root, cache); |
| 256 | if (ret) { |
| 257 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 258 | } |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 259 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 260 | last = max(search_start, cache->key.objectid); |
| 261 | if (!block_group_bits(cache, data) || cache->ro) |
| 262 | goto new_group; |
| 263 | |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 264 | spin_lock_irq(&free_space_cache->lock); |
| 265 | state = find_first_extent_bit_state(free_space_cache, last, EXTENT_DIRTY); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 266 | while(1) { |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 267 | if (!state) { |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 268 | if (!cache_miss) |
| 269 | cache_miss = last; |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 270 | spin_unlock_irq(&free_space_cache->lock); |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 271 | goto new_group; |
| 272 | } |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 273 | |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 274 | start = max(last, state->start); |
| 275 | last = state->end + 1; |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 276 | if (last - start < num) { |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 277 | do { |
| 278 | state = extent_state_next(state); |
| 279 | } while(state && !(state->state & EXTENT_DIRTY)); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 280 | continue; |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 281 | } |
Chris Mason | 7d1660d | 2008-03-24 15:02:03 -0400 | [diff] [blame] | 282 | spin_unlock_irq(&free_space_cache->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 283 | if (cache->ro) { |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 284 | goto new_group; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 285 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 286 | if (start + num > cache->key.objectid + cache->key.offset) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 287 | goto new_group; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 288 | if (!block_group_bits(cache, data)) { |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 289 | printk("block group bits don't match %Lu %d\n", cache->flags, data); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 290 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 291 | *start_ret = start; |
| 292 | return 0; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 293 | } |
| 294 | out: |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 295 | cache = btrfs_lookup_block_group(root->fs_info, search_start); |
| 296 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 297 | printk("Unable to find block group for %Lu\n", search_start); |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 298 | WARN_ON(1); |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 299 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 300 | return -ENOSPC; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 301 | |
| 302 | new_group: |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 303 | last = cache->key.objectid + cache->key.offset; |
Chris Mason | f84a8b3 | 2007-11-06 10:26:29 -0500 | [diff] [blame] | 304 | wrapped: |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 305 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 306 | if (!cache || cache->key.objectid >= total_fs_bytes) { |
Chris Mason | 0e4de58 | 2007-11-26 10:55:49 -0500 | [diff] [blame] | 307 | no_cache: |
Chris Mason | f84a8b3 | 2007-11-06 10:26:29 -0500 | [diff] [blame] | 308 | if (!wrapped) { |
| 309 | wrapped = 1; |
| 310 | last = search_start; |
Chris Mason | f84a8b3 | 2007-11-06 10:26:29 -0500 | [diff] [blame] | 311 | goto wrapped; |
| 312 | } |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 313 | goto out; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 314 | } |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 315 | if (cache_miss && !cache->cached) { |
| 316 | cache_block_group(root, cache); |
| 317 | last = cache_miss; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 318 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 319 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 320 | cache_miss = 0; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 321 | cache = __btrfs_find_block_group(root, cache, last, data, 0); |
Chris Mason | 0e4de58 | 2007-11-26 10:55:49 -0500 | [diff] [blame] | 322 | if (!cache) |
| 323 | goto no_cache; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 324 | *cache_ret = cache; |
| 325 | goto again; |
| 326 | } |
| 327 | |
Chris Mason | 84f54cf | 2007-06-12 07:43:08 -0400 | [diff] [blame] | 328 | static u64 div_factor(u64 num, int factor) |
| 329 | { |
Chris Mason | 257d0ce | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 330 | if (factor == 10) |
| 331 | return num; |
Chris Mason | 84f54cf | 2007-06-12 07:43:08 -0400 | [diff] [blame] | 332 | num *= factor; |
| 333 | do_div(num, 10); |
| 334 | return num; |
| 335 | } |
| 336 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 337 | static int block_group_state_bits(u64 flags) |
| 338 | { |
| 339 | int bits = 0; |
| 340 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 341 | bits |= BLOCK_GROUP_DATA; |
| 342 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 343 | bits |= BLOCK_GROUP_METADATA; |
| 344 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 345 | bits |= BLOCK_GROUP_SYSTEM; |
| 346 | return bits; |
| 347 | } |
| 348 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 349 | static struct btrfs_block_group_cache * |
| 350 | __btrfs_find_block_group(struct btrfs_root *root, |
| 351 | struct btrfs_block_group_cache *hint, |
| 352 | u64 search_start, int data, int owner) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 353 | { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 354 | struct btrfs_block_group_cache *cache; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 355 | struct extent_io_tree *block_group_cache; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 356 | struct btrfs_block_group_cache *found_group = NULL; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 357 | struct btrfs_fs_info *info = root->fs_info; |
| 358 | u64 used; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 359 | u64 last = 0; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 360 | u64 start; |
| 361 | u64 end; |
| 362 | u64 free_check; |
| 363 | u64 ptr; |
| 364 | int bit; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 365 | int ret; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 366 | int full_search = 0; |
Chris Mason | bce4eae | 2008-04-24 14:42:46 -0400 | [diff] [blame] | 367 | int factor = 10; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 368 | int wrapped = 0; |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 369 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 370 | block_group_cache = &info->block_group_cache; |
| 371 | |
Chris Mason | a236aed | 2008-04-29 09:38:00 -0400 | [diff] [blame] | 372 | if (data & BTRFS_BLOCK_GROUP_METADATA) |
| 373 | factor = 9; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 374 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 375 | bit = block_group_state_bits(data); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 376 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 377 | if (search_start) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 378 | struct btrfs_block_group_cache *shint; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 379 | shint = btrfs_lookup_first_block_group(info, search_start); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 380 | if (shint && block_group_bits(shint, data) && !shint->ro) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 381 | used = btrfs_block_group_used(&shint->item); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 382 | if (used + shint->pinned < |
| 383 | div_factor(shint->key.offset, factor)) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 384 | return shint; |
| 385 | } |
| 386 | } |
| 387 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 388 | if (hint && !hint->ro && block_group_bits(hint, data)) { |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 389 | used = btrfs_block_group_used(&hint->item); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 390 | if (used + hint->pinned < |
| 391 | div_factor(hint->key.offset, factor)) { |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 392 | return hint; |
| 393 | } |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 394 | last = hint->key.objectid + hint->key.offset; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 395 | } else { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 396 | if (hint) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 397 | last = max(hint->key.objectid, search_start); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 398 | else |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 399 | last = search_start; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 400 | } |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 401 | again: |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 402 | while(1) { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 403 | ret = find_first_extent_bit(block_group_cache, last, |
| 404 | &start, &end, bit); |
| 405 | if (ret) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 406 | break; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 407 | |
| 408 | ret = get_state_private(block_group_cache, start, &ptr); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 409 | if (ret) { |
| 410 | last = end + 1; |
| 411 | continue; |
| 412 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 413 | |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 414 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 415 | last = cache->key.objectid + cache->key.offset; |
| 416 | used = btrfs_block_group_used(&cache->item); |
| 417 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 418 | if (!cache->ro && block_group_bits(cache, data)) { |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 419 | free_check = div_factor(cache->key.offset, factor); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 420 | if (used + cache->pinned < free_check) { |
| 421 | found_group = cache; |
| 422 | goto found; |
| 423 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 424 | } |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 425 | cond_resched(); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 426 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 427 | if (!wrapped) { |
| 428 | last = search_start; |
| 429 | wrapped = 1; |
| 430 | goto again; |
| 431 | } |
| 432 | if (!full_search && factor < 10) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 433 | last = search_start; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 434 | full_search = 1; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 435 | factor = 10; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 436 | goto again; |
| 437 | } |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 438 | found: |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 439 | return found_group; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 440 | } |
| 441 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 442 | struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, |
| 443 | struct btrfs_block_group_cache |
| 444 | *hint, u64 search_start, |
| 445 | int data, int owner) |
| 446 | { |
| 447 | |
| 448 | struct btrfs_block_group_cache *ret; |
| 449 | mutex_lock(&root->fs_info->alloc_mutex); |
| 450 | ret = __btrfs_find_block_group(root, hint, search_start, data, owner); |
| 451 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 452 | return ret; |
| 453 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 454 | static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 455 | u64 owner, u64 owner_offset) |
| 456 | { |
| 457 | u32 high_crc = ~(u32)0; |
| 458 | u32 low_crc = ~(u32)0; |
| 459 | __le64 lenum; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 460 | lenum = cpu_to_le64(root_objectid); |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 461 | high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 462 | lenum = cpu_to_le64(ref_generation); |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 463 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Chris Mason | 21a4989 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 464 | if (owner >= BTRFS_FIRST_FREE_OBJECTID) { |
| 465 | lenum = cpu_to_le64(owner); |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 466 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Chris Mason | 21a4989 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 467 | lenum = cpu_to_le64(owner_offset); |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 468 | low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); |
Chris Mason | 21a4989 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 469 | } |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 470 | return ((u64)high_crc << 32) | (u64)low_crc; |
| 471 | } |
| 472 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 473 | static int match_extent_ref(struct extent_buffer *leaf, |
| 474 | struct btrfs_extent_ref *disk_ref, |
| 475 | struct btrfs_extent_ref *cpu_ref) |
| 476 | { |
| 477 | int ret; |
| 478 | int len; |
| 479 | |
| 480 | if (cpu_ref->objectid) |
| 481 | len = sizeof(*cpu_ref); |
| 482 | else |
| 483 | len = 2 * sizeof(u64); |
| 484 | ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, |
| 485 | len); |
| 486 | return ret == 0; |
| 487 | } |
| 488 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 489 | static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, |
| 490 | struct btrfs_root *root, |
| 491 | struct btrfs_path *path, u64 bytenr, |
| 492 | u64 root_objectid, |
| 493 | u64 ref_generation, u64 owner, |
| 494 | u64 owner_offset, int del) |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 495 | { |
| 496 | u64 hash; |
| 497 | struct btrfs_key key; |
| 498 | struct btrfs_key found_key; |
| 499 | struct btrfs_extent_ref ref; |
| 500 | struct extent_buffer *leaf; |
| 501 | struct btrfs_extent_ref *disk_ref; |
| 502 | int ret; |
| 503 | int ret2; |
| 504 | |
| 505 | btrfs_set_stack_ref_root(&ref, root_objectid); |
| 506 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
| 507 | btrfs_set_stack_ref_objectid(&ref, owner); |
| 508 | btrfs_set_stack_ref_offset(&ref, owner_offset); |
| 509 | |
| 510 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
| 511 | owner_offset); |
| 512 | key.offset = hash; |
| 513 | key.objectid = bytenr; |
| 514 | key.type = BTRFS_EXTENT_REF_KEY; |
| 515 | |
| 516 | while (1) { |
| 517 | ret = btrfs_search_slot(trans, root, &key, path, |
| 518 | del ? -1 : 0, del); |
| 519 | if (ret < 0) |
| 520 | goto out; |
| 521 | leaf = path->nodes[0]; |
| 522 | if (ret != 0) { |
| 523 | u32 nritems = btrfs_header_nritems(leaf); |
| 524 | if (path->slots[0] >= nritems) { |
| 525 | ret2 = btrfs_next_leaf(root, path); |
| 526 | if (ret2) |
| 527 | goto out; |
| 528 | leaf = path->nodes[0]; |
| 529 | } |
| 530 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 531 | if (found_key.objectid != bytenr || |
| 532 | found_key.type != BTRFS_EXTENT_REF_KEY) |
| 533 | goto out; |
| 534 | key.offset = found_key.offset; |
| 535 | if (del) { |
| 536 | btrfs_release_path(root, path); |
| 537 | continue; |
| 538 | } |
| 539 | } |
| 540 | disk_ref = btrfs_item_ptr(path->nodes[0], |
| 541 | path->slots[0], |
| 542 | struct btrfs_extent_ref); |
| 543 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { |
| 544 | ret = 0; |
| 545 | goto out; |
| 546 | } |
| 547 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 548 | key.offset = found_key.offset + 1; |
| 549 | btrfs_release_path(root, path); |
| 550 | } |
| 551 | out: |
| 552 | return ret; |
| 553 | } |
| 554 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 555 | /* |
| 556 | * Back reference rules. Back refs have three main goals: |
| 557 | * |
| 558 | * 1) differentiate between all holders of references to an extent so that |
| 559 | * when a reference is dropped we can make sure it was a valid reference |
| 560 | * before freeing the extent. |
| 561 | * |
| 562 | * 2) Provide enough information to quickly find the holders of an extent |
| 563 | * if we notice a given block is corrupted or bad. |
| 564 | * |
| 565 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 566 | * maintenance. This is actually the same as #2, but with a slightly |
| 567 | * different use case. |
| 568 | * |
| 569 | * File extents can be referenced by: |
| 570 | * |
| 571 | * - multiple snapshots, subvolumes, or different generations in one subvol |
| 572 | * - different files inside a single subvolume (in theory, not implemented yet) |
| 573 | * - different offsets inside a file (bookend extents in file.c) |
| 574 | * |
| 575 | * The extent ref structure has fields for: |
| 576 | * |
| 577 | * - Objectid of the subvolume root |
| 578 | * - Generation number of the tree holding the reference |
| 579 | * - objectid of the file holding the reference |
| 580 | * - offset in the file corresponding to the key holding the reference |
| 581 | * |
| 582 | * When a file extent is allocated the fields are filled in: |
| 583 | * (root_key.objectid, trans->transid, inode objectid, offset in file) |
| 584 | * |
| 585 | * When a leaf is cow'd new references are added for every file extent found |
| 586 | * in the leaf. It looks the same as the create case, but trans->transid |
| 587 | * will be different when the block is cow'd. |
| 588 | * |
| 589 | * (root_key.objectid, trans->transid, inode objectid, offset in file) |
| 590 | * |
| 591 | * When a file extent is removed either during snapshot deletion or file |
| 592 | * truncation, the corresponding back reference is found |
| 593 | * by searching for: |
| 594 | * |
| 595 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
| 596 | * inode objectid, offset in file) |
| 597 | * |
| 598 | * Btree extents can be referenced by: |
| 599 | * |
| 600 | * - Different subvolumes |
| 601 | * - Different generations of the same subvolume |
| 602 | * |
| 603 | * Storing sufficient information for a full reverse mapping of a btree |
| 604 | * block would require storing the lowest key of the block in the backref, |
| 605 | * and it would require updating that lowest key either before write out or |
| 606 | * every time it changed. Instead, the objectid of the lowest key is stored |
| 607 | * along with the level of the tree block. This provides a hint |
| 608 | * about where in the btree the block can be found. Searches through the |
| 609 | * btree only need to look for a pointer to that block, so they stop one |
| 610 | * level higher than the level recorded in the backref. |
| 611 | * |
| 612 | * Some btrees do not do reference counting on their extents. These |
| 613 | * include the extent tree and the tree of tree roots. Backrefs for these |
| 614 | * trees always have a generation of zero. |
| 615 | * |
| 616 | * When a tree block is created, back references are inserted: |
| 617 | * |
Chris Mason | f6dbff5 | 2007-12-13 11:13:32 -0500 | [diff] [blame] | 618 | * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 619 | * |
| 620 | * When a tree block is cow'd in a reference counted root, |
| 621 | * new back references are added for all the blocks it points to. |
| 622 | * These are of the form (trans->transid will have increased since creation): |
| 623 | * |
Chris Mason | f6dbff5 | 2007-12-13 11:13:32 -0500 | [diff] [blame] | 624 | * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 625 | * |
| 626 | * Because the lowest_key_objectid and the level are just hints |
| 627 | * they are not used when backrefs are deleted. When a backref is deleted: |
| 628 | * |
| 629 | * if backref was for a tree root: |
| 630 | * root_objectid = root->root_key.objectid |
| 631 | * else |
| 632 | * root_objectid = btrfs_header_owner(parent) |
| 633 | * |
| 634 | * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) |
| 635 | * |
| 636 | * Back Reference Key hashing: |
| 637 | * |
| 638 | * Back references have four fields, each 64 bits long. Unfortunately, |
| 639 | * This is hashed into a single 64 bit number and placed into the key offset. |
| 640 | * The key objectid corresponds to the first byte in the extent, and the |
| 641 | * key type is set to BTRFS_EXTENT_REF_KEY |
| 642 | */ |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 643 | int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, |
| 644 | struct btrfs_root *root, |
| 645 | struct btrfs_path *path, u64 bytenr, |
| 646 | u64 root_objectid, u64 ref_generation, |
| 647 | u64 owner, u64 owner_offset) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 648 | { |
| 649 | u64 hash; |
| 650 | struct btrfs_key key; |
| 651 | struct btrfs_extent_ref ref; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 652 | struct btrfs_extent_ref *disk_ref; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 653 | int ret; |
| 654 | |
| 655 | btrfs_set_stack_ref_root(&ref, root_objectid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 656 | btrfs_set_stack_ref_generation(&ref, ref_generation); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 657 | btrfs_set_stack_ref_objectid(&ref, owner); |
| 658 | btrfs_set_stack_ref_offset(&ref, owner_offset); |
| 659 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 660 | hash = hash_extent_ref(root_objectid, ref_generation, owner, |
| 661 | owner_offset); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 662 | key.offset = hash; |
| 663 | key.objectid = bytenr; |
| 664 | key.type = BTRFS_EXTENT_REF_KEY; |
| 665 | |
| 666 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); |
| 667 | while (ret == -EEXIST) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 668 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 669 | struct btrfs_extent_ref); |
| 670 | if (match_extent_ref(path->nodes[0], disk_ref, &ref)) |
| 671 | goto out; |
| 672 | key.offset++; |
| 673 | btrfs_release_path(root, path); |
| 674 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 675 | sizeof(ref)); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 676 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 677 | if (ret) |
| 678 | goto out; |
| 679 | disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 680 | struct btrfs_extent_ref); |
| 681 | write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, |
| 682 | sizeof(ref)); |
| 683 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 684 | out: |
| 685 | btrfs_release_path(root, path); |
| 686 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 687 | } |
| 688 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 689 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 690 | struct btrfs_root *root, |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 691 | u64 bytenr, u64 num_bytes, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 692 | u64 root_objectid, u64 ref_generation, |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 693 | u64 owner, u64 owner_offset) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 694 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 695 | struct btrfs_path *path; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 696 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 697 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 698 | struct extent_buffer *l; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 699 | struct btrfs_extent_item *item; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 700 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 701 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 702 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 703 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 704 | if (!path) |
| 705 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 706 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 707 | path->reada = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 708 | key.objectid = bytenr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 709 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 710 | key.offset = num_bytes; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 711 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 712 | 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 713 | if (ret < 0) |
| 714 | return ret; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 715 | if (ret != 0) { |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 716 | BUG(); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 717 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 718 | BUG_ON(ret != 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 719 | l = path->nodes[0]; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 720 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 721 | refs = btrfs_extent_refs(l, item); |
| 722 | btrfs_set_extent_refs(l, item, refs + 1); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 723 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 724 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 725 | btrfs_release_path(root->fs_info->extent_root, path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 726 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 727 | path->reada = 1; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 728 | ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, |
| 729 | path, bytenr, root_objectid, |
| 730 | ref_generation, owner, owner_offset); |
| 731 | BUG_ON(ret); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 732 | finish_current_insert(trans, root->fs_info->extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 733 | del_pending_extents(trans, root->fs_info->extent_root); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 734 | |
| 735 | btrfs_free_path(path); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 736 | return 0; |
| 737 | } |
| 738 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 739 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
| 740 | struct btrfs_root *root, |
| 741 | u64 bytenr, u64 num_bytes, |
| 742 | u64 root_objectid, u64 ref_generation, |
| 743 | u64 owner, u64 owner_offset) |
| 744 | { |
| 745 | int ret; |
| 746 | |
| 747 | mutex_lock(&root->fs_info->alloc_mutex); |
| 748 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, |
| 749 | root_objectid, ref_generation, |
| 750 | owner, owner_offset); |
| 751 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 752 | return ret; |
| 753 | } |
| 754 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 755 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
| 756 | struct btrfs_root *root) |
| 757 | { |
| 758 | finish_current_insert(trans, root->fs_info->extent_root); |
| 759 | del_pending_extents(trans, root->fs_info->extent_root); |
| 760 | return 0; |
| 761 | } |
| 762 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 763 | static int lookup_extent_ref(struct btrfs_trans_handle *trans, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 764 | struct btrfs_root *root, u64 bytenr, |
| 765 | u64 num_bytes, u32 *refs) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 766 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 767 | struct btrfs_path *path; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 768 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 769 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 770 | struct extent_buffer *l; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 771 | struct btrfs_extent_item *item; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 772 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 773 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 774 | path = btrfs_alloc_path(); |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 775 | path->reada = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 776 | key.objectid = bytenr; |
| 777 | key.offset = num_bytes; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 778 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 779 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 780 | 0, 0); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 781 | if (ret < 0) |
| 782 | goto out; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 783 | if (ret != 0) { |
| 784 | btrfs_print_leaf(root, path->nodes[0]); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 785 | printk("failed to find block number %Lu\n", bytenr); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 786 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 787 | } |
| 788 | l = path->nodes[0]; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 789 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 790 | *refs = btrfs_extent_refs(l, item); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 791 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 792 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 793 | return 0; |
| 794 | } |
| 795 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 796 | u32 btrfs_count_snapshots_in_path(struct btrfs_root *root, |
| 797 | struct btrfs_path *count_path, |
Chris Mason | a68d593 | 2008-05-08 14:11:56 -0400 | [diff] [blame] | 798 | u64 expected_owner, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 799 | u64 first_extent) |
| 800 | { |
| 801 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 802 | struct btrfs_path *path; |
| 803 | u64 bytenr; |
| 804 | u64 found_objectid; |
Chris Mason | a68d593 | 2008-05-08 14:11:56 -0400 | [diff] [blame] | 805 | u64 found_owner; |
Chris Mason | 56b453c | 2008-01-03 09:08:27 -0500 | [diff] [blame] | 806 | u64 root_objectid = root->root_key.objectid; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 807 | u32 total_count = 0; |
Chris Mason | bbaf549 | 2008-05-08 16:31:21 -0400 | [diff] [blame] | 808 | u32 extent_refs; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 809 | u32 cur_count; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 810 | u32 nritems; |
| 811 | int ret; |
| 812 | struct btrfs_key key; |
| 813 | struct btrfs_key found_key; |
| 814 | struct extent_buffer *l; |
| 815 | struct btrfs_extent_item *item; |
| 816 | struct btrfs_extent_ref *ref_item; |
| 817 | int level = -1; |
| 818 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 819 | /* FIXME, needs locking */ |
| 820 | BUG(); |
| 821 | |
| 822 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 823 | path = btrfs_alloc_path(); |
| 824 | again: |
| 825 | if (level == -1) |
| 826 | bytenr = first_extent; |
| 827 | else |
| 828 | bytenr = count_path->nodes[level]->start; |
| 829 | |
| 830 | cur_count = 0; |
| 831 | key.objectid = bytenr; |
| 832 | key.offset = 0; |
| 833 | |
| 834 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 835 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 836 | if (ret < 0) |
| 837 | goto out; |
| 838 | BUG_ON(ret == 0); |
| 839 | |
| 840 | l = path->nodes[0]; |
| 841 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); |
| 842 | |
| 843 | if (found_key.objectid != bytenr || |
| 844 | found_key.type != BTRFS_EXTENT_ITEM_KEY) { |
| 845 | goto out; |
| 846 | } |
| 847 | |
| 848 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | bbaf549 | 2008-05-08 16:31:21 -0400 | [diff] [blame] | 849 | extent_refs = btrfs_extent_refs(l, item); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 850 | while (1) { |
Chris Mason | bd09835 | 2008-01-03 13:23:19 -0500 | [diff] [blame] | 851 | l = path->nodes[0]; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 852 | nritems = btrfs_header_nritems(l); |
| 853 | if (path->slots[0] >= nritems) { |
| 854 | ret = btrfs_next_leaf(extent_root, path); |
| 855 | if (ret == 0) |
| 856 | continue; |
| 857 | break; |
| 858 | } |
| 859 | btrfs_item_key_to_cpu(l, &found_key, path->slots[0]); |
| 860 | if (found_key.objectid != bytenr) |
| 861 | break; |
Chris Mason | bd09835 | 2008-01-03 13:23:19 -0500 | [diff] [blame] | 862 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 863 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
| 864 | path->slots[0]++; |
| 865 | continue; |
| 866 | } |
| 867 | |
| 868 | cur_count++; |
| 869 | ref_item = btrfs_item_ptr(l, path->slots[0], |
| 870 | struct btrfs_extent_ref); |
| 871 | found_objectid = btrfs_ref_root(l, ref_item); |
| 872 | |
Chris Mason | 56b453c | 2008-01-03 09:08:27 -0500 | [diff] [blame] | 873 | if (found_objectid != root_objectid) { |
| 874 | total_count = 2; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 875 | goto out; |
Chris Mason | 56b453c | 2008-01-03 09:08:27 -0500 | [diff] [blame] | 876 | } |
Chris Mason | a68d593 | 2008-05-08 14:11:56 -0400 | [diff] [blame] | 877 | if (level == -1) { |
| 878 | found_owner = btrfs_ref_objectid(l, ref_item); |
| 879 | if (found_owner != expected_owner) { |
| 880 | total_count = 2; |
| 881 | goto out; |
| 882 | } |
Chris Mason | bbaf549 | 2008-05-08 16:31:21 -0400 | [diff] [blame] | 883 | /* |
| 884 | * nasty. we don't count a reference held by |
| 885 | * the running transaction. This allows nodatacow |
| 886 | * to avoid cow most of the time |
| 887 | */ |
| 888 | if (found_owner >= BTRFS_FIRST_FREE_OBJECTID && |
| 889 | btrfs_ref_generation(l, ref_item) == |
| 890 | root->fs_info->generation) { |
| 891 | extent_refs--; |
| 892 | } |
Chris Mason | a68d593 | 2008-05-08 14:11:56 -0400 | [diff] [blame] | 893 | } |
Chris Mason | 56b453c | 2008-01-03 09:08:27 -0500 | [diff] [blame] | 894 | total_count = 1; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 895 | path->slots[0]++; |
| 896 | } |
Chris Mason | bbaf549 | 2008-05-08 16:31:21 -0400 | [diff] [blame] | 897 | /* |
| 898 | * if there is more than one reference against a data extent, |
| 899 | * we have to assume the other ref is another snapshot |
| 900 | */ |
| 901 | if (level == -1 && extent_refs > 1) { |
| 902 | total_count = 2; |
| 903 | goto out; |
| 904 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 905 | if (cur_count == 0) { |
| 906 | total_count = 0; |
| 907 | goto out; |
| 908 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 909 | if (level >= 0 && root->node == count_path->nodes[level]) |
| 910 | goto out; |
| 911 | level++; |
| 912 | btrfs_release_path(root, path); |
| 913 | goto again; |
| 914 | |
| 915 | out: |
| 916 | btrfs_free_path(path); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 917 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 918 | return total_count; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 919 | } |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 920 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 921 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 922 | struct extent_buffer *buf) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 923 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 924 | u64 bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 925 | u32 nritems; |
| 926 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 927 | struct btrfs_file_extent_item *fi; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 928 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 929 | int level; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 930 | int ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 931 | int faili; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 932 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 933 | if (!root->ref_cows) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 934 | return 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 935 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 936 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 937 | level = btrfs_header_level(buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 938 | nritems = btrfs_header_nritems(buf); |
| 939 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 940 | if (level == 0) { |
| 941 | u64 disk_bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 942 | btrfs_item_key_to_cpu(buf, &key, i); |
| 943 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 944 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 945 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 946 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 947 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 236454d | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 948 | BTRFS_FILE_EXTENT_INLINE) |
| 949 | continue; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 950 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 951 | if (disk_bytenr == 0) |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 952 | continue; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 953 | ret = __btrfs_inc_extent_ref(trans, root, disk_bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 954 | btrfs_file_extent_disk_num_bytes(buf, fi), |
| 955 | root->root_key.objectid, trans->transid, |
| 956 | key.objectid, key.offset); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 957 | if (ret) { |
| 958 | faili = i; |
| 959 | goto fail; |
| 960 | } |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 961 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 962 | bytenr = btrfs_node_blockptr(buf, i); |
Chris Mason | 6caab48 | 2007-12-13 09:48:07 -0500 | [diff] [blame] | 963 | btrfs_node_key_to_cpu(buf, &key, i); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 964 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 965 | btrfs_level_size(root, level - 1), |
| 966 | root->root_key.objectid, |
Chris Mason | f6dbff5 | 2007-12-13 11:13:32 -0500 | [diff] [blame] | 967 | trans->transid, |
| 968 | level - 1, key.objectid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 969 | if (ret) { |
| 970 | faili = i; |
| 971 | goto fail; |
| 972 | } |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 973 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 974 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 975 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 976 | return 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 977 | fail: |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 978 | WARN_ON(1); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 979 | #if 0 |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 980 | for (i =0; i < faili; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 981 | if (level == 0) { |
| 982 | u64 disk_bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 983 | btrfs_item_key_to_cpu(buf, &key, i); |
| 984 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 985 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 986 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 987 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 988 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 989 | BTRFS_FILE_EXTENT_INLINE) |
| 990 | continue; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 991 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 992 | if (disk_bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 993 | continue; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 994 | err = btrfs_free_extent(trans, root, disk_bytenr, |
| 995 | btrfs_file_extent_disk_num_bytes(buf, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 996 | fi), 0); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 997 | BUG_ON(err); |
| 998 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 999 | bytenr = btrfs_node_blockptr(buf, i); |
| 1000 | err = btrfs_free_extent(trans, root, bytenr, |
| 1001 | btrfs_level_size(root, level - 1), 0); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1002 | BUG_ON(err); |
| 1003 | } |
| 1004 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1005 | #endif |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1006 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1007 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1008 | } |
| 1009 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1010 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 1011 | struct btrfs_root *root, |
| 1012 | struct btrfs_path *path, |
| 1013 | struct btrfs_block_group_cache *cache) |
| 1014 | { |
| 1015 | int ret; |
| 1016 | int pending_ret; |
| 1017 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1018 | unsigned long bi; |
| 1019 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1020 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1021 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1022 | if (ret < 0) |
| 1023 | goto fail; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1024 | BUG_ON(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1025 | |
| 1026 | leaf = path->nodes[0]; |
| 1027 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 1028 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 1029 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1030 | btrfs_release_path(extent_root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1031 | fail: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1032 | finish_current_insert(trans, extent_root); |
| 1033 | pending_ret = del_pending_extents(trans, extent_root); |
| 1034 | if (ret) |
| 1035 | return ret; |
| 1036 | if (pending_ret) |
| 1037 | return pending_ret; |
| 1038 | return 0; |
| 1039 | |
| 1040 | } |
| 1041 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1042 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 1043 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1044 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1045 | struct extent_io_tree *block_group_cache; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1046 | struct btrfs_block_group_cache *cache; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1047 | int ret; |
| 1048 | int err = 0; |
| 1049 | int werr = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1050 | struct btrfs_path *path; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1051 | u64 last = 0; |
| 1052 | u64 start; |
| 1053 | u64 end; |
| 1054 | u64 ptr; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1055 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1056 | block_group_cache = &root->fs_info->block_group_cache; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1057 | path = btrfs_alloc_path(); |
| 1058 | if (!path) |
| 1059 | return -ENOMEM; |
| 1060 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1061 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1062 | while(1) { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1063 | ret = find_first_extent_bit(block_group_cache, last, |
| 1064 | &start, &end, BLOCK_GROUP_DIRTY); |
| 1065 | if (ret) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1066 | break; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1067 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1068 | last = end + 1; |
| 1069 | ret = get_state_private(block_group_cache, start, &ptr); |
| 1070 | if (ret) |
| 1071 | break; |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 1072 | cache = (struct btrfs_block_group_cache *)(unsigned long)ptr; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1073 | err = write_one_cache_group(trans, root, |
| 1074 | path, cache); |
| 1075 | /* |
| 1076 | * if we fail to write the cache group, we want |
| 1077 | * to keep it marked dirty in hopes that a later |
| 1078 | * write will work |
| 1079 | */ |
| 1080 | if (err) { |
| 1081 | werr = err; |
| 1082 | continue; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1083 | } |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1084 | clear_extent_bits(block_group_cache, start, end, |
| 1085 | BLOCK_GROUP_DIRTY, GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1086 | } |
| 1087 | btrfs_free_path(path); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1088 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1089 | return werr; |
| 1090 | } |
| 1091 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1092 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 1093 | u64 flags) |
| 1094 | { |
| 1095 | struct list_head *head = &info->space_info; |
| 1096 | struct list_head *cur; |
| 1097 | struct btrfs_space_info *found; |
| 1098 | list_for_each(cur, head) { |
| 1099 | found = list_entry(cur, struct btrfs_space_info, list); |
| 1100 | if (found->flags == flags) |
| 1101 | return found; |
| 1102 | } |
| 1103 | return NULL; |
| 1104 | |
| 1105 | } |
| 1106 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1107 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 1108 | u64 total_bytes, u64 bytes_used, |
| 1109 | struct btrfs_space_info **space_info) |
| 1110 | { |
| 1111 | struct btrfs_space_info *found; |
| 1112 | |
| 1113 | found = __find_space_info(info, flags); |
| 1114 | if (found) { |
| 1115 | found->total_bytes += total_bytes; |
| 1116 | found->bytes_used += bytes_used; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1117 | found->full = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1118 | WARN_ON(found->total_bytes < found->bytes_used); |
| 1119 | *space_info = found; |
| 1120 | return 0; |
| 1121 | } |
| 1122 | found = kmalloc(sizeof(*found), GFP_NOFS); |
| 1123 | if (!found) |
| 1124 | return -ENOMEM; |
| 1125 | |
| 1126 | list_add(&found->list, &info->space_info); |
| 1127 | found->flags = flags; |
| 1128 | found->total_bytes = total_bytes; |
| 1129 | found->bytes_used = bytes_used; |
| 1130 | found->bytes_pinned = 0; |
| 1131 | found->full = 0; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1132 | found->force_alloc = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1133 | *space_info = found; |
| 1134 | return 0; |
| 1135 | } |
| 1136 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1137 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 1138 | { |
| 1139 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1140 | BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 1141 | BTRFS_BLOCK_GROUP_RAID10 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1142 | BTRFS_BLOCK_GROUP_DUP); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1143 | if (extra_flags) { |
| 1144 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 1145 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 1146 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 1147 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 1148 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 1149 | fs_info->avail_system_alloc_bits |= extra_flags; |
| 1150 | } |
| 1151 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1152 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1153 | static u64 reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1154 | { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1155 | u64 num_devices = root->fs_info->fs_devices->num_devices; |
| 1156 | |
| 1157 | if (num_devices == 1) |
| 1158 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); |
| 1159 | if (num_devices < 4) |
| 1160 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 1161 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1162 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
| 1163 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1164 | BTRFS_BLOCK_GROUP_RAID10))) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1165 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1166 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1167 | |
| 1168 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1169 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1170 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1171 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1172 | |
| 1173 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && |
| 1174 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | |
| 1175 | (flags & BTRFS_BLOCK_GROUP_RAID10) | |
| 1176 | (flags & BTRFS_BLOCK_GROUP_DUP))) |
| 1177 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; |
| 1178 | return flags; |
| 1179 | } |
| 1180 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1181 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
| 1182 | struct btrfs_root *extent_root, u64 alloc_bytes, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1183 | u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1184 | { |
| 1185 | struct btrfs_space_info *space_info; |
| 1186 | u64 thresh; |
| 1187 | u64 start; |
| 1188 | u64 num_bytes; |
| 1189 | int ret; |
| 1190 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1191 | flags = reduce_alloc_profile(extent_root, flags); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1192 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1193 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1194 | if (!space_info) { |
| 1195 | ret = update_space_info(extent_root->fs_info, flags, |
| 1196 | 0, 0, &space_info); |
| 1197 | BUG_ON(ret); |
| 1198 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1199 | BUG_ON(!space_info); |
| 1200 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1201 | if (space_info->force_alloc) { |
| 1202 | force = 1; |
| 1203 | space_info->force_alloc = 0; |
| 1204 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1205 | if (space_info->full) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1206 | goto out; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1207 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1208 | thresh = div_factor(space_info->total_bytes, 6); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1209 | if (!force && |
| 1210 | (space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) < |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1211 | thresh) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1212 | goto out; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1213 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1214 | mutex_lock(&extent_root->fs_info->chunk_mutex); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1215 | ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes, flags); |
| 1216 | if (ret == -ENOSPC) { |
| 1217 | printk("space info full %Lu\n", flags); |
| 1218 | space_info->full = 1; |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1219 | goto out_unlock; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1220 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1221 | BUG_ON(ret); |
| 1222 | |
| 1223 | ret = btrfs_make_block_group(trans, extent_root, 0, flags, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 1224 | BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1225 | BUG_ON(ret); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1226 | out_unlock: |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1227 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1228 | out: |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1229 | return 0; |
| 1230 | } |
| 1231 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1232 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 1233 | struct btrfs_root *root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1234 | u64 bytenr, u64 num_bytes, int alloc, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1235 | int mark_free) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1236 | { |
| 1237 | struct btrfs_block_group_cache *cache; |
| 1238 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1239 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1240 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1241 | u64 byte_in_group; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1242 | u64 start; |
| 1243 | u64 end; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 1244 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1245 | while(total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1246 | cache = btrfs_lookup_block_group(info, bytenr); |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 1247 | if (!cache) { |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1248 | return -1; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1249 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1250 | byte_in_group = bytenr - cache->key.objectid; |
| 1251 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1252 | start = cache->key.objectid; |
| 1253 | end = start + cache->key.offset - 1; |
| 1254 | set_extent_bits(&info->block_group_cache, start, end, |
| 1255 | BLOCK_GROUP_DIRTY, GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1256 | |
| 1257 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1258 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1259 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1260 | old_val += num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1261 | cache->space_info->bytes_used += num_bytes; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1262 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1263 | old_val -= num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1264 | cache->space_info->bytes_used -= num_bytes; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1265 | if (mark_free) { |
| 1266 | set_extent_dirty(&info->free_space_cache, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1267 | bytenr, bytenr + num_bytes - 1, |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1268 | GFP_NOFS); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 1269 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1270 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1271 | btrfs_set_block_group_used(&cache->item, old_val); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1272 | total -= num_bytes; |
| 1273 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1274 | } |
| 1275 | return 0; |
| 1276 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1277 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1278 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 1279 | { |
| 1280 | u64 start; |
| 1281 | u64 end; |
| 1282 | int ret; |
| 1283 | ret = find_first_extent_bit(&root->fs_info->block_group_cache, |
| 1284 | search_start, &start, &end, |
| 1285 | BLOCK_GROUP_DATA | BLOCK_GROUP_METADATA | |
| 1286 | BLOCK_GROUP_SYSTEM); |
| 1287 | if (ret) |
| 1288 | return 0; |
| 1289 | return start; |
| 1290 | } |
| 1291 | |
| 1292 | |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1293 | static int update_pinned_extents(struct btrfs_root *root, |
| 1294 | u64 bytenr, u64 num, int pin) |
| 1295 | { |
| 1296 | u64 len; |
| 1297 | struct btrfs_block_group_cache *cache; |
| 1298 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1299 | |
| 1300 | if (pin) { |
| 1301 | set_extent_dirty(&fs_info->pinned_extents, |
| 1302 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 1303 | } else { |
| 1304 | clear_extent_dirty(&fs_info->pinned_extents, |
| 1305 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 1306 | } |
| 1307 | while (num > 0) { |
| 1308 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1309 | if (!cache) { |
| 1310 | u64 first = first_logical_byte(root, bytenr); |
| 1311 | WARN_ON(first < bytenr); |
| 1312 | len = min(first - bytenr, num); |
| 1313 | } else { |
| 1314 | len = min(num, cache->key.offset - |
| 1315 | (bytenr - cache->key.objectid)); |
| 1316 | } |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1317 | if (pin) { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1318 | if (cache) { |
| 1319 | cache->pinned += len; |
| 1320 | cache->space_info->bytes_pinned += len; |
| 1321 | } |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1322 | fs_info->total_pinned += len; |
| 1323 | } else { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1324 | if (cache) { |
| 1325 | cache->pinned -= len; |
| 1326 | cache->space_info->bytes_pinned -= len; |
| 1327 | } |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1328 | fs_info->total_pinned -= len; |
| 1329 | } |
| 1330 | bytenr += len; |
| 1331 | num -= len; |
| 1332 | } |
| 1333 | return 0; |
| 1334 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1335 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1336 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1337 | { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1338 | u64 last = 0; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1339 | u64 start; |
| 1340 | u64 end; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1341 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1342 | int ret; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1343 | |
| 1344 | while(1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1345 | ret = find_first_extent_bit(pinned_extents, last, |
| 1346 | &start, &end, EXTENT_DIRTY); |
| 1347 | if (ret) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1348 | break; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1349 | set_extent_dirty(copy, start, end, GFP_NOFS); |
| 1350 | last = end + 1; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 1351 | } |
| 1352 | return 0; |
| 1353 | } |
| 1354 | |
| 1355 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
| 1356 | struct btrfs_root *root, |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1357 | struct extent_io_tree *unpin) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1358 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1359 | u64 start; |
| 1360 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1361 | int ret; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1362 | struct extent_io_tree *free_space_cache; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1363 | free_space_cache = &root->fs_info->free_space_cache; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1364 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1365 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1366 | while(1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1367 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
| 1368 | EXTENT_DIRTY); |
| 1369 | if (ret) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1370 | break; |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1371 | update_pinned_extents(root, start, end + 1 - start, 0); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1372 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
| 1373 | set_extent_dirty(free_space_cache, start, end, GFP_NOFS); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1374 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1375 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1376 | return 0; |
| 1377 | } |
| 1378 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 1379 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
| 1380 | struct btrfs_root *extent_root) |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1381 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1382 | u64 start; |
| 1383 | u64 end; |
| 1384 | struct btrfs_fs_info *info = extent_root->fs_info; |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 1385 | struct extent_buffer *eb; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1386 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 1387 | struct btrfs_key ins; |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 1388 | struct btrfs_disk_key first; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1389 | struct btrfs_extent_item extent_item; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1390 | int ret; |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 1391 | int level; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1392 | int err = 0; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1393 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1394 | btrfs_set_stack_extent_refs(&extent_item, 1); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 1395 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1396 | path = btrfs_alloc_path(); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1397 | |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1398 | while(1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1399 | ret = find_first_extent_bit(&info->extent_ins, 0, &start, |
| 1400 | &end, EXTENT_LOCKED); |
| 1401 | if (ret) |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1402 | break; |
| 1403 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1404 | ins.objectid = start; |
| 1405 | ins.offset = end + 1 - start; |
| 1406 | err = btrfs_insert_item(trans, extent_root, &ins, |
| 1407 | &extent_item, sizeof(extent_item)); |
| 1408 | clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, |
| 1409 | GFP_NOFS); |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 1410 | eb = read_tree_block(extent_root, ins.objectid, ins.offset, |
| 1411 | trans->transid); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1412 | btrfs_tree_lock(eb); |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 1413 | level = btrfs_header_level(eb); |
| 1414 | if (level == 0) { |
| 1415 | btrfs_item_key(eb, &first, 0); |
| 1416 | } else { |
| 1417 | btrfs_node_key(eb, &first, 0); |
| 1418 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1419 | btrfs_tree_unlock(eb); |
| 1420 | free_extent_buffer(eb); |
| 1421 | /* |
| 1422 | * the first key is just a hint, so the race we've created |
| 1423 | * against reading it is fine |
| 1424 | */ |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1425 | err = btrfs_insert_extent_backref(trans, extent_root, path, |
| 1426 | start, extent_root->root_key.objectid, |
Chris Mason | f6dbff5 | 2007-12-13 11:13:32 -0500 | [diff] [blame] | 1427 | 0, level, |
| 1428 | btrfs_disk_key_objectid(&first)); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1429 | BUG_ON(err); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1430 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1431 | btrfs_free_path(path); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1432 | return 0; |
| 1433 | } |
| 1434 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1435 | static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, |
| 1436 | int pending) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1437 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1438 | int err = 0; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1439 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1440 | if (!pending) { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1441 | #if 0 |
| 1442 | struct extent_buffer *buf; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1443 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1444 | if (buf) { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1445 | if (!btrfs_try_tree_lock(buf) && |
| 1446 | btrfs_buffer_uptodate(buf, 0)) { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1447 | u64 transid = |
| 1448 | root->fs_info->running_transaction->transid; |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 1449 | u64 header_transid = |
| 1450 | btrfs_header_generation(buf); |
Chris Mason | 6bc3467 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 1451 | if (header_transid == transid && |
| 1452 | !btrfs_header_flag(buf, |
| 1453 | BTRFS_HEADER_FLAG_WRITTEN)) { |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 1454 | clean_tree_block(NULL, root, buf); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1455 | btrfs_tree_unlock(buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1456 | free_extent_buffer(buf); |
Yan | c549228 | 2007-11-06 10:25:25 -0500 | [diff] [blame] | 1457 | return 1; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1458 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1459 | btrfs_tree_unlock(buf); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1460 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1461 | free_extent_buffer(buf); |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 1462 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1463 | #endif |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1464 | update_pinned_extents(root, bytenr, num_bytes, 1); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1465 | } else { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1466 | set_extent_bits(&root->fs_info->pending_del, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1467 | bytenr, bytenr + num_bytes - 1, |
| 1468 | EXTENT_LOCKED, GFP_NOFS); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 1469 | } |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1470 | BUG_ON(err < 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1471 | return 0; |
| 1472 | } |
| 1473 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1474 | /* |
| 1475 | * remove an extent from the root, returns 0 on success |
| 1476 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1477 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1478 | *root, u64 bytenr, u64 num_bytes, |
| 1479 | u64 root_objectid, u64 ref_generation, |
| 1480 | u64 owner_objectid, u64 owner_offset, int pin, |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 1481 | int mark_free) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1482 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1483 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 1484 | struct btrfs_key key; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 1485 | struct btrfs_fs_info *info = root->fs_info; |
| 1486 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1487 | struct extent_buffer *leaf; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1488 | int ret; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1489 | int extent_slot = 0; |
| 1490 | int found_extent = 0; |
| 1491 | int num_to_del = 1; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1492 | struct btrfs_extent_item *ei; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 1493 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1494 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1495 | key.objectid = bytenr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 1496 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1497 | key.offset = num_bytes; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1498 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1499 | if (!path) |
| 1500 | return -ENOMEM; |
| 1501 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1502 | path->reada = 1; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1503 | ret = lookup_extent_backref(trans, extent_root, path, |
| 1504 | bytenr, root_objectid, |
| 1505 | ref_generation, |
| 1506 | owner_objectid, owner_offset, 1); |
| 1507 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1508 | struct btrfs_key found_key; |
| 1509 | extent_slot = path->slots[0]; |
| 1510 | while(extent_slot > 0) { |
| 1511 | extent_slot--; |
| 1512 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 1513 | extent_slot); |
| 1514 | if (found_key.objectid != bytenr) |
| 1515 | break; |
| 1516 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && |
| 1517 | found_key.offset == num_bytes) { |
| 1518 | found_extent = 1; |
| 1519 | break; |
| 1520 | } |
| 1521 | if (path->slots[0] - extent_slot > 5) |
| 1522 | break; |
| 1523 | } |
| 1524 | if (!found_extent) |
| 1525 | ret = btrfs_del_item(trans, extent_root, path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1526 | } else { |
| 1527 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 1528 | WARN_ON(1); |
| 1529 | printk("Unable to find ref byte nr %Lu root %Lu " |
| 1530 | " gen %Lu owner %Lu offset %Lu\n", bytenr, |
| 1531 | root_objectid, ref_generation, owner_objectid, |
| 1532 | owner_offset); |
| 1533 | } |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1534 | if (!found_extent) { |
| 1535 | btrfs_release_path(extent_root, path); |
| 1536 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); |
| 1537 | if (ret < 0) |
| 1538 | return ret; |
| 1539 | BUG_ON(ret); |
| 1540 | extent_slot = path->slots[0]; |
| 1541 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1542 | |
| 1543 | leaf = path->nodes[0]; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1544 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1545 | struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1546 | refs = btrfs_extent_refs(leaf, ei); |
| 1547 | BUG_ON(refs == 0); |
| 1548 | refs -= 1; |
| 1549 | btrfs_set_extent_refs(leaf, ei, refs); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1550 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1551 | btrfs_mark_buffer_dirty(leaf); |
| 1552 | |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1553 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
| 1554 | /* if the back ref and the extent are next to each other |
| 1555 | * they get deleted below in one shot |
| 1556 | */ |
| 1557 | path->slots[0] = extent_slot; |
| 1558 | num_to_del = 2; |
| 1559 | } else if (found_extent) { |
| 1560 | /* otherwise delete the extent back ref */ |
| 1561 | ret = btrfs_del_item(trans, extent_root, path); |
| 1562 | BUG_ON(ret); |
| 1563 | /* if refs are 0, we need to setup the path for deletion */ |
| 1564 | if (refs == 0) { |
| 1565 | btrfs_release_path(extent_root, path); |
| 1566 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 1567 | -1, 1); |
| 1568 | if (ret < 0) |
| 1569 | return ret; |
| 1570 | BUG_ON(ret); |
| 1571 | } |
| 1572 | } |
| 1573 | |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 1574 | if (refs == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1575 | u64 super_used; |
| 1576 | u64 root_used; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1577 | |
| 1578 | if (pin) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1579 | ret = pin_down_bytes(root, bytenr, num_bytes, 0); |
Yan | c549228 | 2007-11-06 10:25:25 -0500 | [diff] [blame] | 1580 | if (ret > 0) |
| 1581 | mark_free = 1; |
| 1582 | BUG_ON(ret < 0); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 1583 | } |
| 1584 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1585 | /* block accounting for super block */ |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1586 | spin_lock_irq(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1587 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 1588 | btrfs_set_super_bytes_used(&info->super_copy, |
| 1589 | super_used - num_bytes); |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1590 | spin_unlock_irq(&info->delalloc_lock); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1591 | |
| 1592 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1593 | root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1594 | btrfs_set_root_used(&root->root_item, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1595 | root_used - num_bytes); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 1596 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 1597 | num_to_del); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1598 | if (ret) { |
| 1599 | return ret; |
| 1600 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1601 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1602 | mark_free); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1603 | BUG_ON(ret); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1604 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1605 | btrfs_free_path(path); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1606 | finish_current_insert(trans, extent_root); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1607 | return ret; |
| 1608 | } |
| 1609 | |
| 1610 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1611 | * find all the blocks marked as pending in the radix tree and remove |
| 1612 | * them from the extent map |
| 1613 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1614 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
| 1615 | btrfs_root *extent_root) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1616 | { |
| 1617 | int ret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1618 | int err = 0; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1619 | u64 start; |
| 1620 | u64 end; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1621 | struct extent_io_tree *pending_del; |
| 1622 | struct extent_io_tree *pinned_extents; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 1623 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1624 | pending_del = &extent_root->fs_info->pending_del; |
| 1625 | pinned_extents = &extent_root->fs_info->pinned_extents; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1626 | |
| 1627 | while(1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1628 | ret = find_first_extent_bit(pending_del, 0, &start, &end, |
| 1629 | EXTENT_LOCKED); |
| 1630 | if (ret) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1631 | break; |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 1632 | update_pinned_extents(extent_root, start, end + 1 - start, 1); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1633 | clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, |
| 1634 | GFP_NOFS); |
| 1635 | ret = __free_extent(trans, extent_root, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1636 | start, end + 1 - start, |
| 1637 | extent_root->root_key.objectid, |
| 1638 | 0, 0, 0, 0, 0); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1639 | if (ret) |
| 1640 | err = ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1641 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1642 | return err; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1643 | } |
| 1644 | |
| 1645 | /* |
| 1646 | * remove an extent from the root, returns 0 on success |
| 1647 | */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1648 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 1649 | struct btrfs_root *root, u64 bytenr, |
| 1650 | u64 num_bytes, u64 root_objectid, |
| 1651 | u64 ref_generation, u64 owner_objectid, |
| 1652 | u64 owner_offset, int pin) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1653 | { |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 1654 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1655 | int pending_ret; |
| 1656 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1657 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1658 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1659 | if (!root->ref_cows) |
| 1660 | ref_generation = 0; |
| 1661 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1662 | if (root == extent_root) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1663 | pin_down_bytes(root, bytenr, num_bytes, 1); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1664 | return 0; |
| 1665 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1666 | ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, |
| 1667 | ref_generation, owner_objectid, owner_offset, |
| 1668 | pin, pin == 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1669 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1670 | return ret ? ret : pending_ret; |
| 1671 | } |
| 1672 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1673 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
| 1674 | struct btrfs_root *root, u64 bytenr, |
| 1675 | u64 num_bytes, u64 root_objectid, |
| 1676 | u64 ref_generation, u64 owner_objectid, |
| 1677 | u64 owner_offset, int pin) |
| 1678 | { |
| 1679 | int ret; |
| 1680 | |
| 1681 | maybe_lock_mutex(root); |
| 1682 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, |
| 1683 | root_objectid, ref_generation, |
| 1684 | owner_objectid, owner_offset, pin); |
| 1685 | maybe_unlock_mutex(root); |
| 1686 | return ret; |
| 1687 | } |
| 1688 | |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 1689 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
| 1690 | { |
| 1691 | u64 mask = ((u64)root->stripesize - 1); |
| 1692 | u64 ret = (val + mask) & ~mask; |
| 1693 | return ret; |
| 1694 | } |
| 1695 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1696 | /* |
| 1697 | * walks the btree of allocated extents and find a hole of a given size. |
| 1698 | * The key ins is changed to record the hole: |
| 1699 | * ins->objectid == block start |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 1700 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1701 | * ins->offset == number of blocks |
| 1702 | * Any available blocks before search_start are skipped. |
| 1703 | */ |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 1704 | static int noinline find_free_extent(struct btrfs_trans_handle *trans, |
| 1705 | struct btrfs_root *orig_root, |
| 1706 | u64 num_bytes, u64 empty_size, |
| 1707 | u64 search_start, u64 search_end, |
| 1708 | u64 hint_byte, struct btrfs_key *ins, |
| 1709 | u64 exclude_start, u64 exclude_nr, |
| 1710 | int data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1711 | { |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 1712 | int ret; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1713 | u64 orig_search_start; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 1714 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
Chris Mason | f2458e1 | 2007-04-25 15:52:25 -0400 | [diff] [blame] | 1715 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1716 | u64 total_needed = num_bytes; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1717 | u64 *last_ptr = NULL; |
Chris Mason | be08c1b | 2007-05-03 09:06:49 -0400 | [diff] [blame] | 1718 | struct btrfs_block_group_cache *block_group; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1719 | int full_scan = 0; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1720 | int wrapped = 0; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1721 | int chunk_alloc_done = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1722 | int empty_cluster = 2 * 1024 * 1024; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1723 | int allowed_chunk_alloc = 0; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1724 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1725 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 1726 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
| 1727 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1728 | if (orig_root->ref_cows || empty_size) |
| 1729 | allowed_chunk_alloc = 1; |
| 1730 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1731 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
| 1732 | last_ptr = &root->fs_info->last_alloc; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1733 | empty_cluster = 256 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1734 | } |
| 1735 | |
| 1736 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) { |
| 1737 | last_ptr = &root->fs_info->last_data_alloc; |
| 1738 | } |
| 1739 | |
| 1740 | if (last_ptr) { |
| 1741 | if (*last_ptr) |
| 1742 | hint_byte = *last_ptr; |
| 1743 | else { |
| 1744 | empty_size += empty_cluster; |
| 1745 | } |
| 1746 | } |
| 1747 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1748 | search_start = max(search_start, first_logical_byte(root, 0)); |
| 1749 | orig_search_start = search_start; |
| 1750 | |
Chris Mason | 7f93bf8 | 2008-03-24 15:01:28 -0400 | [diff] [blame] | 1751 | if (search_end == (u64)-1) |
| 1752 | search_end = btrfs_super_total_bytes(&info->super_copy); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1753 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1754 | if (hint_byte) { |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1755 | block_group = btrfs_lookup_first_block_group(info, hint_byte); |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 1756 | if (!block_group) |
| 1757 | hint_byte = search_start; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1758 | block_group = __btrfs_find_block_group(root, block_group, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1759 | hint_byte, data, 1); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1760 | if (last_ptr && *last_ptr == 0 && block_group) |
| 1761 | hint_byte = block_group->key.objectid; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1762 | } else { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1763 | block_group = __btrfs_find_block_group(root, |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 1764 | trans->block_group, |
| 1765 | search_start, data, 1); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1766 | } |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1767 | search_start = max(search_start, hint_byte); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1768 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1769 | total_needed += empty_size; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1770 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1771 | check_failed: |
Chris Mason | 70b043f | 2007-12-13 09:02:46 -0500 | [diff] [blame] | 1772 | if (!block_group) { |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1773 | block_group = btrfs_lookup_first_block_group(info, |
| 1774 | search_start); |
Chris Mason | 70b043f | 2007-12-13 09:02:46 -0500 | [diff] [blame] | 1775 | if (!block_group) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1776 | block_group = btrfs_lookup_first_block_group(info, |
Chris Mason | 70b043f | 2007-12-13 09:02:46 -0500 | [diff] [blame] | 1777 | orig_search_start); |
| 1778 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1779 | if (full_scan && !chunk_alloc_done) { |
| 1780 | if (allowed_chunk_alloc) { |
| 1781 | do_chunk_alloc(trans, root, |
| 1782 | num_bytes + 2 * 1024 * 1024, data, 1); |
| 1783 | allowed_chunk_alloc = 0; |
| 1784 | } else if (block_group && block_group_bits(block_group, data)) { |
| 1785 | block_group->space_info->force_alloc = 1; |
| 1786 | } |
| 1787 | chunk_alloc_done = 1; |
| 1788 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1789 | ret = find_search_start(root, &block_group, &search_start, |
| 1790 | total_needed, data); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1791 | if (ret == -ENOSPC && last_ptr && *last_ptr) { |
| 1792 | *last_ptr = 0; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1793 | block_group = btrfs_lookup_first_block_group(info, |
| 1794 | orig_search_start); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1795 | search_start = orig_search_start; |
| 1796 | ret = find_search_start(root, &block_group, &search_start, |
| 1797 | total_needed, data); |
| 1798 | } |
| 1799 | if (ret == -ENOSPC) |
| 1800 | goto enospc; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1801 | if (ret) |
| 1802 | goto error; |
| 1803 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1804 | if (last_ptr && *last_ptr && search_start != *last_ptr) { |
| 1805 | *last_ptr = 0; |
| 1806 | if (!empty_size) { |
| 1807 | empty_size += empty_cluster; |
| 1808 | total_needed += empty_size; |
| 1809 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1810 | block_group = btrfs_lookup_first_block_group(info, |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1811 | orig_search_start); |
| 1812 | search_start = orig_search_start; |
| 1813 | ret = find_search_start(root, &block_group, |
| 1814 | &search_start, total_needed, data); |
| 1815 | if (ret == -ENOSPC) |
| 1816 | goto enospc; |
| 1817 | if (ret) |
| 1818 | goto error; |
| 1819 | } |
| 1820 | |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 1821 | search_start = stripe_align(root, search_start); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1822 | ins->objectid = search_start; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1823 | ins->offset = num_bytes; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 1824 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1825 | if (ins->objectid + num_bytes >= search_end) |
Chris Mason | cf67582 | 2007-09-17 11:00:51 -0400 | [diff] [blame] | 1826 | goto enospc; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1827 | |
| 1828 | if (ins->objectid + num_bytes > |
| 1829 | block_group->key.objectid + block_group->key.offset) { |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 1830 | search_start = block_group->key.objectid + |
| 1831 | block_group->key.offset; |
| 1832 | goto new_group; |
| 1833 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1834 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1835 | if (test_range_bit(&info->extent_ins, ins->objectid, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1836 | ins->objectid + num_bytes -1, EXTENT_LOCKED, 0)) { |
| 1837 | search_start = ins->objectid + num_bytes; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1838 | goto new_group; |
| 1839 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1840 | |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1841 | if (test_range_bit(&info->pinned_extents, ins->objectid, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1842 | ins->objectid + num_bytes -1, EXTENT_DIRTY, 0)) { |
| 1843 | search_start = ins->objectid + num_bytes; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1844 | goto new_group; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1845 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1846 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1847 | if (exclude_nr > 0 && (ins->objectid + num_bytes > exclude_start && |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 1848 | ins->objectid < exclude_start + exclude_nr)) { |
| 1849 | search_start = exclude_start + exclude_nr; |
| 1850 | goto new_group; |
| 1851 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1852 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1853 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) { |
Chris Mason | 5276aed | 2007-06-11 21:33:38 -0400 | [diff] [blame] | 1854 | block_group = btrfs_lookup_block_group(info, ins->objectid); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1855 | if (block_group) |
| 1856 | trans->block_group = block_group; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 1857 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1858 | ins->offset = num_bytes; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1859 | if (last_ptr) { |
| 1860 | *last_ptr = ins->objectid + ins->offset; |
| 1861 | if (*last_ptr == |
| 1862 | btrfs_super_total_bytes(&root->fs_info->super_copy)) { |
| 1863 | *last_ptr = 0; |
| 1864 | } |
| 1865 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1866 | return 0; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1867 | |
| 1868 | new_group: |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1869 | if (search_start + num_bytes >= search_end) { |
Chris Mason | cf67582 | 2007-09-17 11:00:51 -0400 | [diff] [blame] | 1870 | enospc: |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1871 | search_start = orig_search_start; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1872 | if (full_scan) { |
| 1873 | ret = -ENOSPC; |
| 1874 | goto error; |
| 1875 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1876 | if (wrapped) { |
| 1877 | if (!full_scan) |
| 1878 | total_needed -= empty_size; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1879 | full_scan = 1; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1880 | } else |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1881 | wrapped = 1; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1882 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1883 | block_group = btrfs_lookup_first_block_group(info, search_start); |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1884 | cond_resched(); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1885 | block_group = __btrfs_find_block_group(root, block_group, |
Chris Mason | 1a2b2ac | 2007-12-04 13:18:24 -0500 | [diff] [blame] | 1886 | search_start, data, 0); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 1887 | goto check_failed; |
| 1888 | |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 1889 | error: |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 1890 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1891 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1892 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1893 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1894 | * finds a free extent and does all the dirty work required for allocation |
| 1895 | * returns the key for the extent through ins, and a tree buffer for |
| 1896 | * the first block of the extent through buf. |
| 1897 | * |
| 1898 | * returns 0 if everything worked, non-zero otherwise. |
| 1899 | */ |
Chris Mason | 4d77567 | 2007-04-20 20:23:12 -0400 | [diff] [blame] | 1900 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1901 | struct btrfs_root *root, |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 1902 | u64 num_bytes, u64 min_alloc_size, |
| 1903 | u64 root_objectid, u64 ref_generation, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1904 | u64 owner, u64 owner_offset, |
| 1905 | u64 empty_size, u64 hint_byte, |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1906 | u64 search_end, struct btrfs_key *ins, u64 data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 1907 | { |
| 1908 | int ret; |
| 1909 | int pending_ret; |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 1910 | u64 super_used; |
| 1911 | u64 root_used; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 1912 | u64 search_start = 0; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1913 | u64 alloc_profile; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 1914 | u32 sizes[2]; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 1915 | struct btrfs_fs_info *info = root->fs_info; |
| 1916 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 1917 | struct btrfs_extent_item *extent_item; |
| 1918 | struct btrfs_extent_ref *ref; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1919 | struct btrfs_path *path; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 1920 | struct btrfs_key keys[2]; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 1921 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1922 | maybe_lock_mutex(root); |
| 1923 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1924 | if (data) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1925 | alloc_profile = info->avail_data_alloc_bits & |
| 1926 | info->data_alloc_profile; |
| 1927 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1928 | } else if (root == root->fs_info->chunk_root) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1929 | alloc_profile = info->avail_system_alloc_bits & |
| 1930 | info->system_alloc_profile; |
| 1931 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1932 | } else { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1933 | alloc_profile = info->avail_metadata_alloc_bits & |
| 1934 | info->metadata_alloc_profile; |
| 1935 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1936 | } |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 1937 | again: |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1938 | data = reduce_alloc_profile(root, data); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1939 | /* |
| 1940 | * the only place that sets empty_size is btrfs_realloc_node, which |
| 1941 | * is not called recursively on allocations |
| 1942 | */ |
| 1943 | if (empty_size || root->ref_cows) { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1944 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1945 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1946 | 2 * 1024 * 1024, |
| 1947 | BTRFS_BLOCK_GROUP_METADATA | |
| 1948 | (info->metadata_alloc_profile & |
| 1949 | info->avail_metadata_alloc_bits), 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1950 | BUG_ON(ret); |
| 1951 | } |
| 1952 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1953 | num_bytes + 2 * 1024 * 1024, data, 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1954 | BUG_ON(ret); |
| 1955 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1956 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1957 | WARN_ON(num_bytes < root->sectorsize); |
| 1958 | ret = find_free_extent(trans, root, num_bytes, empty_size, |
| 1959 | search_start, search_end, hint_byte, ins, |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1960 | trans->alloc_exclude_start, |
| 1961 | trans->alloc_exclude_nr, data); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 1962 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 1963 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
| 1964 | num_bytes = num_bytes >> 1; |
| 1965 | num_bytes = max(num_bytes, min_alloc_size); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1966 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 1967 | num_bytes, data, 1); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 1968 | goto again; |
| 1969 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1970 | if (ret) { |
| 1971 | printk("allocation failed flags %Lu\n", data); |
| 1972 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1973 | if (ret) { |
| 1974 | BUG(); |
| 1975 | goto out; |
| 1976 | } |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 1977 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1978 | /* block accounting for super block */ |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1979 | spin_lock_irq(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1980 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 1981 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1982 | spin_unlock_irq(&info->delalloc_lock); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1983 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1984 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1985 | root_used = btrfs_root_used(&root->root_item); |
| 1986 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1987 | |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1988 | clear_extent_dirty(&root->fs_info->free_space_cache, |
| 1989 | ins->objectid, ins->objectid + ins->offset - 1, |
| 1990 | GFP_NOFS); |
| 1991 | |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1992 | if (root == extent_root) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1993 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
| 1994 | ins->objectid + ins->offset - 1, |
| 1995 | EXTENT_LOCKED, GFP_NOFS); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1996 | goto update_block; |
| 1997 | } |
| 1998 | |
| 1999 | WARN_ON(trans->alloc_exclude_nr); |
| 2000 | trans->alloc_exclude_start = ins->objectid; |
| 2001 | trans->alloc_exclude_nr = ins->offset; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2002 | |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2003 | memcpy(&keys[0], ins, sizeof(*ins)); |
| 2004 | keys[1].offset = hash_extent_ref(root_objectid, ref_generation, |
| 2005 | owner, owner_offset); |
| 2006 | keys[1].objectid = ins->objectid; |
| 2007 | keys[1].type = BTRFS_EXTENT_REF_KEY; |
| 2008 | sizes[0] = sizeof(*extent_item); |
| 2009 | sizes[1] = sizeof(*ref); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2010 | |
| 2011 | path = btrfs_alloc_path(); |
| 2012 | BUG_ON(!path); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2013 | |
| 2014 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, |
| 2015 | sizes, 2); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2016 | |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2017 | BUG_ON(ret); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 2018 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 2019 | struct btrfs_extent_item); |
| 2020 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); |
| 2021 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 2022 | struct btrfs_extent_ref); |
| 2023 | |
| 2024 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); |
| 2025 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); |
| 2026 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); |
| 2027 | btrfs_set_ref_offset(path->nodes[0], ref, owner_offset); |
| 2028 | |
| 2029 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 2030 | |
| 2031 | trans->alloc_exclude_start = 0; |
| 2032 | trans->alloc_exclude_nr = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2033 | btrfs_free_path(path); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2034 | finish_current_insert(trans, extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2035 | pending_ret = del_pending_extents(trans, extent_root); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2036 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2037 | if (ret) |
| 2038 | goto out; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2039 | if (pending_ret) { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2040 | ret = pending_ret; |
| 2041 | goto out; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2042 | } |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2043 | |
| 2044 | update_block: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2045 | ret = update_block_group(trans, root, ins->objectid, ins->offset, 1, 0); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 2046 | if (ret) { |
| 2047 | printk("update block group failed for %Lu %Lu\n", |
| 2048 | ins->objectid, ins->offset); |
| 2049 | BUG(); |
| 2050 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2051 | out: |
| 2052 | maybe_unlock_mutex(root); |
| 2053 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2054 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2055 | /* |
| 2056 | * helper function to allocate a block for a given tree |
| 2057 | * returns the tree buffer or NULL. |
| 2058 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2059 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2060 | struct btrfs_root *root, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2061 | u32 blocksize, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2062 | u64 root_objectid, |
| 2063 | u64 ref_generation, |
| 2064 | u64 first_objectid, |
| 2065 | int level, |
| 2066 | u64 hint, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2067 | u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2068 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 2069 | struct btrfs_key ins; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2070 | int ret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2071 | struct extent_buffer *buf; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2072 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 2073 | ret = btrfs_alloc_extent(trans, root, blocksize, blocksize, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2074 | root_objectid, ref_generation, |
Chris Mason | f6dbff5 | 2007-12-13 11:13:32 -0500 | [diff] [blame] | 2075 | level, first_objectid, empty_size, hint, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2076 | (u64)-1, &ins, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2077 | if (ret) { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2078 | BUG_ON(ret > 0); |
| 2079 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2080 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2081 | buf = btrfs_find_create_tree_block(root, ins.objectid, blocksize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2082 | if (!buf) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2083 | btrfs_free_extent(trans, root, ins.objectid, blocksize, |
| 2084 | root->root_key.objectid, ref_generation, |
| 2085 | 0, 0, 0); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2086 | return ERR_PTR(-ENOMEM); |
| 2087 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2088 | btrfs_set_header_generation(buf, trans->transid); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2089 | btrfs_tree_lock(buf); |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2090 | clean_tree_block(trans, root, buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2091 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2092 | |
| 2093 | if (PageDirty(buf->first_page)) { |
| 2094 | printk("page %lu dirty\n", buf->first_page->index); |
| 2095 | WARN_ON(1); |
| 2096 | } |
| 2097 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2098 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 2099 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | 9afbb0b | 2008-02-15 13:19:35 -0500 | [diff] [blame] | 2100 | if (!btrfs_test_opt(root, SSD)) |
| 2101 | btrfs_set_buffer_defrag(buf); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2102 | trans->blocks_used++; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2103 | return buf; |
| 2104 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2105 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2106 | static int noinline drop_leaf_ref(struct btrfs_trans_handle *trans, |
| 2107 | struct btrfs_root *root, |
| 2108 | struct extent_buffer *leaf) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2109 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2110 | u64 leaf_owner; |
| 2111 | u64 leaf_generation; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2112 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2113 | struct btrfs_file_extent_item *fi; |
| 2114 | int i; |
| 2115 | int nritems; |
| 2116 | int ret; |
| 2117 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2118 | BUG_ON(!btrfs_is_leaf(leaf)); |
| 2119 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2120 | leaf_owner = btrfs_header_owner(leaf); |
| 2121 | leaf_generation = btrfs_header_generation(leaf); |
| 2122 | |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2123 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2124 | u64 disk_bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2125 | |
| 2126 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 2127 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2128 | continue; |
| 2129 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2130 | if (btrfs_file_extent_type(leaf, fi) == |
| 2131 | BTRFS_FILE_EXTENT_INLINE) |
Chris Mason | 236454d | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 2132 | continue; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2133 | /* |
| 2134 | * FIXME make sure to insert a trans record that |
| 2135 | * repeats the snapshot del on crash |
| 2136 | */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2137 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 2138 | if (disk_bytenr == 0) |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 2139 | continue; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2140 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2141 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
| 2142 | leaf_owner, leaf_generation, |
| 2143 | key.objectid, key.offset, 0); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2144 | BUG_ON(ret); |
| 2145 | } |
| 2146 | return 0; |
| 2147 | } |
| 2148 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2149 | static void noinline reada_walk_down(struct btrfs_root *root, |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2150 | struct extent_buffer *node, |
| 2151 | int slot) |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2152 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2153 | u64 bytenr; |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2154 | u64 last = 0; |
| 2155 | u32 nritems; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2156 | u32 refs; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2157 | u32 blocksize; |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2158 | int ret; |
| 2159 | int i; |
| 2160 | int level; |
| 2161 | int skipped = 0; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2162 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2163 | nritems = btrfs_header_nritems(node); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2164 | level = btrfs_header_level(node); |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2165 | if (level) |
| 2166 | return; |
| 2167 | |
| 2168 | for (i = slot; i < nritems && skipped < 32; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2169 | bytenr = btrfs_node_blockptr(node, i); |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2170 | if (last && ((bytenr > last && bytenr - last > 32 * 1024) || |
| 2171 | (last > bytenr && last - bytenr > 32 * 1024))) { |
| 2172 | skipped++; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2173 | continue; |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2174 | } |
| 2175 | blocksize = btrfs_level_size(root, level - 1); |
| 2176 | if (i != slot) { |
| 2177 | ret = lookup_extent_ref(NULL, root, bytenr, |
| 2178 | blocksize, &refs); |
| 2179 | BUG_ON(ret); |
| 2180 | if (refs != 1) { |
| 2181 | skipped++; |
| 2182 | continue; |
| 2183 | } |
| 2184 | } |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 2185 | ret = readahead_tree_block(root, bytenr, blocksize, |
| 2186 | btrfs_node_ptr_generation(node, i)); |
Chris Mason | bea495e | 2008-01-24 16:13:14 -0500 | [diff] [blame] | 2187 | last = bytenr + blocksize; |
Chris Mason | 409eb95 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2188 | cond_resched(); |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2189 | if (ret) |
| 2190 | break; |
| 2191 | } |
| 2192 | } |
| 2193 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2194 | /* |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2195 | * we want to avoid as much random IO as we can with the alloc mutex |
| 2196 | * held, so drop the lock and do the lookup, then do it again with the |
| 2197 | * lock held. |
| 2198 | */ |
| 2199 | int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len, |
| 2200 | u32 *refs) |
| 2201 | { |
| 2202 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 2203 | lookup_extent_ref(NULL, root, start, len, refs); |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame^] | 2204 | cond_resched(); |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2205 | mutex_lock(&root->fs_info->alloc_mutex); |
| 2206 | return lookup_extent_ref(NULL, root, start, len, refs); |
| 2207 | } |
| 2208 | |
| 2209 | /* |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2210 | * helper function for drop_snapshot, this walks down the tree dropping ref |
| 2211 | * counts as it goes. |
| 2212 | */ |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2213 | static int noinline walk_down_tree(struct btrfs_trans_handle *trans, |
| 2214 | struct btrfs_root *root, |
| 2215 | struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2216 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2217 | u64 root_owner; |
| 2218 | u64 root_gen; |
| 2219 | u64 bytenr; |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 2220 | u64 ptr_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2221 | struct extent_buffer *next; |
| 2222 | struct extent_buffer *cur; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2223 | struct extent_buffer *parent; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2224 | u32 blocksize; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2225 | int ret; |
| 2226 | u32 refs; |
| 2227 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2228 | mutex_lock(&root->fs_info->alloc_mutex); |
| 2229 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2230 | WARN_ON(*level < 0); |
| 2231 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2232 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2233 | path->nodes[*level]->len, &refs); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2234 | BUG_ON(ret); |
| 2235 | if (refs > 1) |
| 2236 | goto out; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2237 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2238 | /* |
| 2239 | * walk down to the last node level and free all the leaves |
| 2240 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2241 | while(*level >= 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2242 | WARN_ON(*level < 0); |
| 2243 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2244 | cur = path->nodes[*level]; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2245 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2246 | if (btrfs_header_level(cur) != *level) |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2247 | WARN_ON(1); |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 2248 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2249 | if (path->slots[*level] >= |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2250 | btrfs_header_nritems(cur)) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2251 | break; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2252 | if (*level == 0) { |
| 2253 | ret = drop_leaf_ref(trans, root, cur); |
| 2254 | BUG_ON(ret); |
| 2255 | break; |
| 2256 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2257 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 2258 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2259 | blocksize = btrfs_level_size(root, *level - 1); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2260 | |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2261 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2262 | BUG_ON(ret); |
| 2263 | if (refs != 1) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2264 | parent = path->nodes[*level]; |
| 2265 | root_owner = btrfs_header_owner(parent); |
| 2266 | root_gen = btrfs_header_generation(parent); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2267 | path->slots[*level]++; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2268 | ret = __btrfs_free_extent(trans, root, bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2269 | blocksize, root_owner, |
| 2270 | root_gen, 0, 0, 1); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2271 | BUG_ON(ret); |
| 2272 | continue; |
| 2273 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2274 | next = btrfs_find_tree_block(root, bytenr, blocksize); |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 2275 | if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2276 | free_extent_buffer(next); |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2277 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 2278 | |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 2279 | if (path->slots[*level] == 0) |
| 2280 | reada_walk_down(root, cur, path->slots[*level]); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2281 | |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 2282 | next = read_tree_block(root, bytenr, blocksize, |
| 2283 | ptr_gen); |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame^] | 2284 | cond_resched(); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2285 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 2286 | |
| 2287 | /* we've dropped the lock, double check */ |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2288 | ret = drop_snap_lookup_refcount(root, bytenr, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2289 | blocksize, &refs); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2290 | BUG_ON(ret); |
| 2291 | if (refs != 1) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2292 | parent = path->nodes[*level]; |
| 2293 | root_owner = btrfs_header_owner(parent); |
| 2294 | root_gen = btrfs_header_generation(parent); |
| 2295 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2296 | path->slots[*level]++; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2297 | free_extent_buffer(next); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2298 | ret = __btrfs_free_extent(trans, root, bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2299 | blocksize, |
| 2300 | root_owner, |
| 2301 | root_gen, 0, 0, 1); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 2302 | BUG_ON(ret); |
| 2303 | continue; |
| 2304 | } |
| 2305 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2306 | WARN_ON(*level <= 0); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 2307 | if (path->nodes[*level-1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2308 | free_extent_buffer(path->nodes[*level-1]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2309 | path->nodes[*level-1] = next; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2310 | *level = btrfs_header_level(next); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2311 | path->slots[*level] = 0; |
| 2312 | } |
| 2313 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2314 | WARN_ON(*level < 0); |
| 2315 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2316 | |
| 2317 | if (path->nodes[*level] == root->node) { |
| 2318 | root_owner = root->root_key.objectid; |
| 2319 | parent = path->nodes[*level]; |
| 2320 | } else { |
| 2321 | parent = path->nodes[*level + 1]; |
| 2322 | root_owner = btrfs_header_owner(parent); |
| 2323 | } |
| 2324 | |
| 2325 | root_gen = btrfs_header_generation(parent); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2326 | ret = __btrfs_free_extent(trans, root, path->nodes[*level]->start, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2327 | path->nodes[*level]->len, |
| 2328 | root_owner, root_gen, 0, 0, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2329 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2330 | path->nodes[*level] = NULL; |
| 2331 | *level += 1; |
| 2332 | BUG_ON(ret); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2333 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame^] | 2334 | cond_resched(); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2335 | return 0; |
| 2336 | } |
| 2337 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2338 | /* |
| 2339 | * helper for dropping snapshots. This walks back up the tree in the path |
| 2340 | * to find the first node higher up where we haven't yet gone through |
| 2341 | * all the slots |
| 2342 | */ |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2343 | static int noinline walk_up_tree(struct btrfs_trans_handle *trans, |
| 2344 | struct btrfs_root *root, |
| 2345 | struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2346 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2347 | u64 root_owner; |
| 2348 | u64 root_gen; |
| 2349 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2350 | int i; |
| 2351 | int slot; |
| 2352 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2353 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2354 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2355 | slot = path->slots[i]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2356 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
| 2357 | struct extent_buffer *node; |
| 2358 | struct btrfs_disk_key disk_key; |
| 2359 | node = path->nodes[i]; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2360 | path->slots[i]++; |
| 2361 | *level = i; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2362 | WARN_ON(*level == 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2363 | btrfs_node_key(node, &disk_key, path->slots[i]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2364 | memcpy(&root_item->drop_progress, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2365 | &disk_key, sizeof(disk_key)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2366 | root_item->drop_level = i; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2367 | return 0; |
| 2368 | } else { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2369 | if (path->nodes[*level] == root->node) { |
| 2370 | root_owner = root->root_key.objectid; |
| 2371 | root_gen = |
| 2372 | btrfs_header_generation(path->nodes[*level]); |
| 2373 | } else { |
| 2374 | struct extent_buffer *node; |
| 2375 | node = path->nodes[*level + 1]; |
| 2376 | root_owner = btrfs_header_owner(node); |
| 2377 | root_gen = btrfs_header_generation(node); |
| 2378 | } |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2379 | ret = btrfs_free_extent(trans, root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2380 | path->nodes[*level]->start, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2381 | path->nodes[*level]->len, |
| 2382 | root_owner, root_gen, 0, 0, 1); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 2383 | BUG_ON(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2384 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 2385 | path->nodes[*level] = NULL; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2386 | *level = i + 1; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2387 | } |
| 2388 | } |
| 2389 | return 1; |
| 2390 | } |
| 2391 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2392 | /* |
| 2393 | * drop the reference count on the tree rooted at 'snap'. This traverses |
| 2394 | * the tree freeing any blocks that have a ref count of zero after being |
| 2395 | * decremented. |
| 2396 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2397 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2398 | *root) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2399 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 2400 | int ret = 0; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2401 | int wret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2402 | int level; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2403 | struct btrfs_path *path; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2404 | int i; |
| 2405 | int orig_level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2406 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2407 | |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2408 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2409 | path = btrfs_alloc_path(); |
| 2410 | BUG_ON(!path); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2411 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2412 | level = btrfs_header_level(root->node); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2413 | orig_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2414 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| 2415 | path->nodes[level] = root->node; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2416 | extent_buffer_get(root->node); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2417 | path->slots[level] = 0; |
| 2418 | } else { |
| 2419 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2420 | struct btrfs_disk_key found_key; |
| 2421 | struct extent_buffer *node; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2422 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2423 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2424 | level = root_item->drop_level; |
| 2425 | path->lowest_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2426 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2427 | if (wret < 0) { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2428 | ret = wret; |
| 2429 | goto out; |
| 2430 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2431 | node = path->nodes[level]; |
| 2432 | btrfs_node_key(node, &found_key, path->slots[level]); |
| 2433 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, |
| 2434 | sizeof(found_key))); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2435 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
| 2436 | if (path->nodes[i] && path->locks[i]) { |
| 2437 | path->locks[i] = 0; |
| 2438 | btrfs_tree_unlock(path->nodes[i]); |
| 2439 | } |
| 2440 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2441 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2442 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2443 | wret = walk_down_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2444 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2445 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2446 | if (wret < 0) |
| 2447 | ret = wret; |
| 2448 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2449 | wret = walk_up_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2450 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2451 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2452 | if (wret < 0) |
| 2453 | ret = wret; |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame^] | 2454 | if (trans->transaction->in_commit) { |
| 2455 | ret = -EAGAIN; |
| 2456 | break; |
| 2457 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2458 | } |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 2459 | for (i = 0; i <= orig_level; i++) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2460 | if (path->nodes[i]) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2461 | free_extent_buffer(path->nodes[i]); |
Chris Mason | 0f82731 | 2007-10-15 16:18:56 -0400 | [diff] [blame] | 2462 | path->nodes[i] = NULL; |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 2463 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2464 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 2465 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2466 | btrfs_free_path(path); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 2467 | return ret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 2468 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2469 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 2470 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 2471 | { |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2472 | u64 start; |
| 2473 | u64 end; |
Yan | b97f920 | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2474 | u64 ptr; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 2475 | int ret; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2476 | |
| 2477 | mutex_lock(&info->alloc_mutex); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 2478 | while(1) { |
| 2479 | ret = find_first_extent_bit(&info->block_group_cache, 0, |
| 2480 | &start, &end, (unsigned int)-1); |
| 2481 | if (ret) |
| 2482 | break; |
Yan | b97f920 | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2483 | ret = get_state_private(&info->block_group_cache, start, &ptr); |
| 2484 | if (!ret) |
| 2485 | kfree((void *)(unsigned long)ptr); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 2486 | clear_extent_bits(&info->block_group_cache, start, |
| 2487 | end, (unsigned int)-1, GFP_NOFS); |
| 2488 | } |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2489 | while(1) { |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2490 | ret = find_first_extent_bit(&info->free_space_cache, 0, |
| 2491 | &start, &end, EXTENT_DIRTY); |
| 2492 | if (ret) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2493 | break; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2494 | clear_extent_dirty(&info->free_space_cache, start, |
| 2495 | end, GFP_NOFS); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2496 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2497 | mutex_unlock(&info->alloc_mutex); |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 2498 | return 0; |
| 2499 | } |
| 2500 | |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 2501 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
| 2502 | unsigned long nr) |
| 2503 | { |
| 2504 | return min(last, start + nr - 1); |
| 2505 | } |
| 2506 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2507 | static int noinline relocate_inode_pages(struct inode *inode, u64 start, |
| 2508 | u64 len) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2509 | { |
| 2510 | u64 page_start; |
| 2511 | u64 page_end; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2512 | unsigned long last_index; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2513 | unsigned long i; |
| 2514 | struct page *page; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2515 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2516 | struct file_ra_state *ra; |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 2517 | unsigned long total_read = 0; |
| 2518 | unsigned long ra_pages; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2519 | struct btrfs_trans_handle *trans; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2520 | |
| 2521 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2522 | |
| 2523 | mutex_lock(&inode->i_mutex); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2524 | i = start >> PAGE_CACHE_SHIFT; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2525 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
| 2526 | |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 2527 | ra_pages = BTRFS_I(inode)->root->fs_info->bdi.ra_pages; |
| 2528 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2529 | file_ra_state_init(ra, inode->i_mapping); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2530 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2531 | for (; i <= last_index; i++) { |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 2532 | if (total_read % ra_pages == 0) { |
| 2533 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
| 2534 | calc_ra(i, last_index, ra_pages)); |
| 2535 | } |
| 2536 | total_read++; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2537 | if (((u64)i << PAGE_CACHE_SHIFT) > inode->i_size) |
| 2538 | goto truncate_racing; |
| 2539 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2540 | page = grab_cache_page(inode->i_mapping, i); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2541 | if (!page) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2542 | goto out_unlock; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2543 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2544 | if (!PageUptodate(page)) { |
| 2545 | btrfs_readpage(NULL, page); |
| 2546 | lock_page(page); |
| 2547 | if (!PageUptodate(page)) { |
| 2548 | unlock_page(page); |
| 2549 | page_cache_release(page); |
| 2550 | goto out_unlock; |
| 2551 | } |
| 2552 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2553 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
| 2554 | ClearPageDirty(page); |
| 2555 | #else |
| 2556 | cancel_dirty_page(page, PAGE_CACHE_SIZE); |
| 2557 | #endif |
| 2558 | wait_on_page_writeback(page); |
| 2559 | set_page_extent_mapped(page); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2560 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 2561 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 2562 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2563 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2564 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2565 | set_extent_delalloc(io_tree, page_start, |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2566 | page_end, GFP_NOFS); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2567 | set_page_dirty(page); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2568 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2569 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2570 | unlock_page(page); |
| 2571 | page_cache_release(page); |
| 2572 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2573 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
| 2574 | total_read); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2575 | |
| 2576 | out_unlock: |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2577 | kfree(ra); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2578 | trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1); |
| 2579 | if (trans) { |
| 2580 | btrfs_add_ordered_inode(inode); |
| 2581 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); |
| 2582 | mark_inode_dirty(inode); |
| 2583 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2584 | mutex_unlock(&inode->i_mutex); |
| 2585 | return 0; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2586 | |
| 2587 | truncate_racing: |
| 2588 | vmtruncate(inode, inode->i_size); |
| 2589 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, |
| 2590 | total_read); |
| 2591 | goto out_unlock; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2592 | } |
| 2593 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2594 | /* |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2595 | * The back references tell us which tree holds a ref on a block, |
| 2596 | * but it is possible for the tree root field in the reference to |
| 2597 | * reflect the original root before a snapshot was made. In this |
| 2598 | * case we should search through all the children of a given root |
| 2599 | * to find potential holders of references on a block. |
| 2600 | * |
| 2601 | * Instead, we do something a little less fancy and just search |
| 2602 | * all the roots for a given key/block combination. |
| 2603 | */ |
| 2604 | static int find_root_for_ref(struct btrfs_root *root, |
| 2605 | struct btrfs_path *path, |
| 2606 | struct btrfs_key *key0, |
| 2607 | int level, |
| 2608 | int file_key, |
| 2609 | struct btrfs_root **found_root, |
| 2610 | u64 bytenr) |
| 2611 | { |
| 2612 | struct btrfs_key root_location; |
| 2613 | struct btrfs_root *cur_root = *found_root; |
| 2614 | struct btrfs_file_extent_item *file_extent; |
| 2615 | u64 root_search_start = BTRFS_FS_TREE_OBJECTID; |
| 2616 | u64 found_bytenr; |
| 2617 | int ret; |
| 2618 | int i; |
| 2619 | |
| 2620 | root_location.offset = (u64)-1; |
| 2621 | root_location.type = BTRFS_ROOT_ITEM_KEY; |
| 2622 | path->lowest_level = level; |
| 2623 | path->reada = 0; |
| 2624 | while(1) { |
| 2625 | ret = btrfs_search_slot(NULL, cur_root, key0, path, 0, 0); |
| 2626 | found_bytenr = 0; |
| 2627 | if (ret == 0 && file_key) { |
| 2628 | struct extent_buffer *leaf = path->nodes[0]; |
| 2629 | file_extent = btrfs_item_ptr(leaf, path->slots[0], |
| 2630 | struct btrfs_file_extent_item); |
| 2631 | if (btrfs_file_extent_type(leaf, file_extent) == |
| 2632 | BTRFS_FILE_EXTENT_REG) { |
| 2633 | found_bytenr = |
| 2634 | btrfs_file_extent_disk_bytenr(leaf, |
| 2635 | file_extent); |
| 2636 | } |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 2637 | } else if (!file_key) { |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2638 | if (path->nodes[level]) |
| 2639 | found_bytenr = path->nodes[level]->start; |
| 2640 | } |
| 2641 | |
| 2642 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { |
| 2643 | if (!path->nodes[i]) |
| 2644 | break; |
| 2645 | free_extent_buffer(path->nodes[i]); |
| 2646 | path->nodes[i] = NULL; |
| 2647 | } |
| 2648 | btrfs_release_path(cur_root, path); |
| 2649 | |
| 2650 | if (found_bytenr == bytenr) { |
| 2651 | *found_root = cur_root; |
| 2652 | ret = 0; |
| 2653 | goto out; |
| 2654 | } |
| 2655 | ret = btrfs_search_root(root->fs_info->tree_root, |
| 2656 | root_search_start, &root_search_start); |
| 2657 | if (ret) |
| 2658 | break; |
| 2659 | |
| 2660 | root_location.objectid = root_search_start; |
| 2661 | cur_root = btrfs_read_fs_root_no_name(root->fs_info, |
| 2662 | &root_location); |
| 2663 | if (!cur_root) { |
| 2664 | ret = 1; |
| 2665 | break; |
| 2666 | } |
| 2667 | } |
| 2668 | out: |
| 2669 | path->lowest_level = 0; |
| 2670 | return ret; |
| 2671 | } |
| 2672 | |
| 2673 | /* |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2674 | * note, this releases the path |
| 2675 | */ |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2676 | static int noinline relocate_one_reference(struct btrfs_root *extent_root, |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2677 | struct btrfs_path *path, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2678 | struct btrfs_key *extent_key, |
| 2679 | u64 *last_file_objectid, |
| 2680 | u64 *last_file_offset, |
| 2681 | u64 *last_file_root, |
| 2682 | u64 last_extent) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2683 | { |
| 2684 | struct inode *inode; |
| 2685 | struct btrfs_root *found_root; |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2686 | struct btrfs_key root_location; |
| 2687 | struct btrfs_key found_key; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2688 | struct btrfs_extent_ref *ref; |
| 2689 | u64 ref_root; |
| 2690 | u64 ref_gen; |
| 2691 | u64 ref_objectid; |
| 2692 | u64 ref_offset; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2693 | int ret; |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2694 | int level; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2695 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 2696 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 2697 | struct btrfs_extent_ref); |
| 2698 | ref_root = btrfs_ref_root(path->nodes[0], ref); |
| 2699 | ref_gen = btrfs_ref_generation(path->nodes[0], ref); |
| 2700 | ref_objectid = btrfs_ref_objectid(path->nodes[0], ref); |
| 2701 | ref_offset = btrfs_ref_offset(path->nodes[0], ref); |
| 2702 | btrfs_release_path(extent_root, path); |
| 2703 | |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2704 | root_location.objectid = ref_root; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2705 | if (ref_gen == 0) |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2706 | root_location.offset = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2707 | else |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2708 | root_location.offset = (u64)-1; |
| 2709 | root_location.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2710 | |
| 2711 | found_root = btrfs_read_fs_root_no_name(extent_root->fs_info, |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2712 | &root_location); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2713 | BUG_ON(!found_root); |
| 2714 | |
| 2715 | if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2716 | found_key.objectid = ref_objectid; |
| 2717 | found_key.type = BTRFS_EXTENT_DATA_KEY; |
| 2718 | found_key.offset = ref_offset; |
| 2719 | level = 0; |
| 2720 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2721 | if (last_extent == extent_key->objectid && |
| 2722 | *last_file_objectid == ref_objectid && |
| 2723 | *last_file_offset == ref_offset && |
| 2724 | *last_file_root == ref_root) |
| 2725 | goto out; |
| 2726 | |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2727 | ret = find_root_for_ref(extent_root, path, &found_key, |
| 2728 | level, 1, &found_root, |
| 2729 | extent_key->objectid); |
| 2730 | |
| 2731 | if (ret) |
| 2732 | goto out; |
| 2733 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2734 | if (last_extent == extent_key->objectid && |
| 2735 | *last_file_objectid == ref_objectid && |
| 2736 | *last_file_offset == ref_offset && |
| 2737 | *last_file_root == ref_root) |
| 2738 | goto out; |
| 2739 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2740 | inode = btrfs_iget_locked(extent_root->fs_info->sb, |
| 2741 | ref_objectid, found_root); |
| 2742 | if (inode->i_state & I_NEW) { |
| 2743 | /* the inode and parent dir are two different roots */ |
| 2744 | BTRFS_I(inode)->root = found_root; |
| 2745 | BTRFS_I(inode)->location.objectid = ref_objectid; |
| 2746 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; |
| 2747 | BTRFS_I(inode)->location.offset = 0; |
| 2748 | btrfs_read_locked_inode(inode); |
| 2749 | unlock_new_inode(inode); |
| 2750 | |
| 2751 | } |
| 2752 | /* this can happen if the reference is not against |
| 2753 | * the latest version of the tree root |
| 2754 | */ |
| 2755 | if (is_bad_inode(inode)) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2756 | goto out; |
| 2757 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2758 | *last_file_objectid = inode->i_ino; |
| 2759 | *last_file_root = found_root->root_key.objectid; |
| 2760 | *last_file_offset = ref_offset; |
| 2761 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2762 | relocate_inode_pages(inode, ref_offset, extent_key->offset); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2763 | iput(inode); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2764 | } else { |
| 2765 | struct btrfs_trans_handle *trans; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2766 | struct extent_buffer *eb; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2767 | int i; |
| 2768 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2769 | eb = read_tree_block(found_root, extent_key->objectid, |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 2770 | extent_key->offset, 0); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2771 | btrfs_tree_lock(eb); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2772 | level = btrfs_header_level(eb); |
| 2773 | |
| 2774 | if (level == 0) |
| 2775 | btrfs_item_key_to_cpu(eb, &found_key, 0); |
| 2776 | else |
| 2777 | btrfs_node_key_to_cpu(eb, &found_key, 0); |
| 2778 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2779 | btrfs_tree_unlock(eb); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2780 | free_extent_buffer(eb); |
| 2781 | |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2782 | ret = find_root_for_ref(extent_root, path, &found_key, |
| 2783 | level, 0, &found_root, |
| 2784 | extent_key->objectid); |
| 2785 | |
| 2786 | if (ret) |
| 2787 | goto out; |
| 2788 | |
| 2789 | trans = btrfs_start_transaction(found_root, 1); |
| 2790 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2791 | path->lowest_level = level; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 2792 | path->reada = 2; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2793 | ret = btrfs_search_slot(trans, found_root, &found_key, path, |
| 2794 | 0, 1); |
| 2795 | path->lowest_level = 0; |
| 2796 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { |
| 2797 | if (!path->nodes[i]) |
| 2798 | break; |
| 2799 | free_extent_buffer(path->nodes[i]); |
| 2800 | path->nodes[i] = NULL; |
| 2801 | } |
| 2802 | btrfs_release_path(found_root, path); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2803 | if (found_root == found_root->fs_info->extent_root) |
| 2804 | btrfs_extent_post_op(trans, found_root); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2805 | btrfs_end_transaction(trans, found_root); |
| 2806 | } |
| 2807 | |
| 2808 | out: |
| 2809 | return 0; |
| 2810 | } |
| 2811 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2812 | static int noinline del_extent_zero(struct btrfs_root *extent_root, |
| 2813 | struct btrfs_path *path, |
| 2814 | struct btrfs_key *extent_key) |
| 2815 | { |
| 2816 | int ret; |
| 2817 | struct btrfs_trans_handle *trans; |
| 2818 | |
| 2819 | trans = btrfs_start_transaction(extent_root, 1); |
| 2820 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
| 2821 | if (ret > 0) { |
| 2822 | ret = -EIO; |
| 2823 | goto out; |
| 2824 | } |
| 2825 | if (ret < 0) |
| 2826 | goto out; |
| 2827 | ret = btrfs_del_item(trans, extent_root, path); |
| 2828 | out: |
| 2829 | btrfs_end_transaction(trans, extent_root); |
| 2830 | return ret; |
| 2831 | } |
| 2832 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2833 | static int noinline relocate_one_extent(struct btrfs_root *extent_root, |
| 2834 | struct btrfs_path *path, |
| 2835 | struct btrfs_key *extent_key) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2836 | { |
| 2837 | struct btrfs_key key; |
| 2838 | struct btrfs_key found_key; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2839 | struct extent_buffer *leaf; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2840 | u64 last_file_objectid = 0; |
| 2841 | u64 last_file_root = 0; |
| 2842 | u64 last_file_offset = (u64)-1; |
| 2843 | u64 last_extent = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2844 | u32 nritems; |
| 2845 | u32 item_size; |
| 2846 | int ret = 0; |
| 2847 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2848 | if (extent_key->objectid == 0) { |
| 2849 | ret = del_extent_zero(extent_root, path, extent_key); |
| 2850 | goto out; |
| 2851 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2852 | key.objectid = extent_key->objectid; |
| 2853 | key.type = BTRFS_EXTENT_REF_KEY; |
| 2854 | key.offset = 0; |
| 2855 | |
| 2856 | while(1) { |
| 2857 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 2858 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2859 | if (ret < 0) |
| 2860 | goto out; |
| 2861 | |
| 2862 | ret = 0; |
| 2863 | leaf = path->nodes[0]; |
| 2864 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2865 | if (path->slots[0] == nritems) { |
| 2866 | ret = btrfs_next_leaf(extent_root, path); |
| 2867 | if (ret > 0) { |
| 2868 | ret = 0; |
| 2869 | goto out; |
| 2870 | } |
| 2871 | if (ret < 0) |
| 2872 | goto out; |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 2873 | leaf = path->nodes[0]; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2874 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2875 | |
| 2876 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2877 | if (found_key.objectid != extent_key->objectid) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2878 | break; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2879 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2880 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2881 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2882 | break; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2883 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2884 | |
| 2885 | key.offset = found_key.offset + 1; |
| 2886 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 2887 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2888 | ret = relocate_one_reference(extent_root, path, extent_key, |
| 2889 | &last_file_objectid, |
| 2890 | &last_file_offset, |
| 2891 | &last_file_root, last_extent); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2892 | if (ret) |
| 2893 | goto out; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2894 | last_extent = extent_key->objectid; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2895 | } |
| 2896 | ret = 0; |
| 2897 | out: |
| 2898 | btrfs_release_path(extent_root, path); |
| 2899 | return ret; |
| 2900 | } |
| 2901 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2902 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 2903 | { |
| 2904 | u64 num_devices; |
| 2905 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | |
| 2906 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 2907 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2908 | num_devices = root->fs_info->fs_devices->num_devices; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2909 | if (num_devices == 1) { |
| 2910 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 2911 | stripped = flags & ~stripped; |
| 2912 | |
| 2913 | /* turn raid0 into single device chunks */ |
| 2914 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 2915 | return stripped; |
| 2916 | |
| 2917 | /* turn mirroring into duplication */ |
| 2918 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 2919 | BTRFS_BLOCK_GROUP_RAID10)) |
| 2920 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
| 2921 | return flags; |
| 2922 | } else { |
| 2923 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 2924 | if (flags & stripped) |
| 2925 | return flags; |
| 2926 | |
| 2927 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 2928 | stripped = flags & ~stripped; |
| 2929 | |
| 2930 | /* switch duplicated blocks with raid1 */ |
| 2931 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 2932 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 2933 | |
| 2934 | /* turn single device chunks into raid0 */ |
| 2935 | return stripped | BTRFS_BLOCK_GROUP_RAID0; |
| 2936 | } |
| 2937 | return flags; |
| 2938 | } |
| 2939 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2940 | int __alloc_chunk_for_shrink(struct btrfs_root *root, |
| 2941 | struct btrfs_block_group_cache *shrink_block_group, |
| 2942 | int force) |
| 2943 | { |
| 2944 | struct btrfs_trans_handle *trans; |
| 2945 | u64 new_alloc_flags; |
| 2946 | u64 calc; |
| 2947 | |
| 2948 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
| 2949 | |
| 2950 | trans = btrfs_start_transaction(root, 1); |
| 2951 | new_alloc_flags = update_block_group_flags(root, |
| 2952 | shrink_block_group->flags); |
| 2953 | if (new_alloc_flags != shrink_block_group->flags) { |
| 2954 | calc = |
| 2955 | btrfs_block_group_used(&shrink_block_group->item); |
| 2956 | } else { |
| 2957 | calc = shrink_block_group->key.offset; |
| 2958 | } |
| 2959 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 2960 | calc + 2 * 1024 * 1024, new_alloc_flags, force); |
| 2961 | btrfs_end_transaction(trans, root); |
| 2962 | } |
| 2963 | return 0; |
| 2964 | } |
| 2965 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2966 | int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 shrink_start) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2967 | { |
| 2968 | struct btrfs_trans_handle *trans; |
| 2969 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
| 2970 | struct btrfs_path *path; |
| 2971 | u64 cur_byte; |
| 2972 | u64 total_found; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2973 | u64 shrink_last_byte; |
| 2974 | struct btrfs_block_group_cache *shrink_block_group; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2975 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2976 | struct btrfs_key key; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 2977 | struct btrfs_key found_key; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2978 | struct extent_buffer *leaf; |
| 2979 | u32 nritems; |
| 2980 | int ret; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2981 | int progress; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2982 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2983 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2984 | shrink_block_group = btrfs_lookup_block_group(root->fs_info, |
| 2985 | shrink_start); |
| 2986 | BUG_ON(!shrink_block_group); |
| 2987 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2988 | shrink_last_byte = shrink_block_group->key.objectid + |
| 2989 | shrink_block_group->key.offset; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 2990 | |
| 2991 | shrink_block_group->space_info->total_bytes -= |
| 2992 | shrink_block_group->key.offset; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2993 | path = btrfs_alloc_path(); |
| 2994 | root = root->fs_info->extent_root; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 2995 | path->reada = 2; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 2996 | |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 2997 | printk("btrfs relocating block group %llu flags %llu\n", |
| 2998 | (unsigned long long)shrink_start, |
| 2999 | (unsigned long long)shrink_block_group->flags); |
| 3000 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3001 | __alloc_chunk_for_shrink(root, shrink_block_group, 1); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 3002 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3003 | again: |
| 3004 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3005 | shrink_block_group->ro = 1; |
| 3006 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3007 | total_found = 0; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 3008 | progress = 0; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3009 | key.objectid = shrink_start; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3010 | key.offset = 0; |
| 3011 | key.type = 0; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3012 | cur_byte = key.objectid; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 3013 | |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3014 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3015 | if (ret < 0) |
| 3016 | goto out; |
| 3017 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3018 | ret = btrfs_previous_item(root, path, 0, BTRFS_EXTENT_ITEM_KEY); |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3019 | if (ret < 0) |
| 3020 | goto out; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3021 | |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3022 | if (ret == 0) { |
| 3023 | leaf = path->nodes[0]; |
| 3024 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3025 | if (found_key.objectid + found_key.offset > shrink_start && |
| 3026 | found_key.objectid < shrink_last_byte) { |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3027 | cur_byte = found_key.objectid; |
| 3028 | key.objectid = cur_byte; |
| 3029 | } |
| 3030 | } |
| 3031 | btrfs_release_path(root, path); |
| 3032 | |
| 3033 | while(1) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3034 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3035 | if (ret < 0) |
| 3036 | goto out; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3037 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3038 | leaf = path->nodes[0]; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3039 | nritems = btrfs_header_nritems(leaf); |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3040 | next: |
| 3041 | if (path->slots[0] >= nritems) { |
| 3042 | ret = btrfs_next_leaf(root, path); |
| 3043 | if (ret < 0) |
| 3044 | goto out; |
| 3045 | if (ret == 1) { |
| 3046 | ret = 0; |
| 3047 | break; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3048 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3049 | leaf = path->nodes[0]; |
| 3050 | nritems = btrfs_header_nritems(leaf); |
| 3051 | } |
| 3052 | |
| 3053 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 3054 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3055 | if (found_key.objectid >= shrink_last_byte) |
| 3056 | break; |
| 3057 | |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 3058 | if (progress && need_resched()) { |
| 3059 | memcpy(&key, &found_key, sizeof(key)); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 3060 | cond_resched(); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 3061 | btrfs_release_path(root, path); |
| 3062 | btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3063 | progress = 0; |
| 3064 | goto next; |
| 3065 | } |
| 3066 | progress = 1; |
| 3067 | |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3068 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY || |
| 3069 | found_key.objectid + found_key.offset <= cur_byte) { |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3070 | memcpy(&key, &found_key, sizeof(key)); |
| 3071 | key.offset++; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3072 | path->slots[0]++; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3073 | goto next; |
| 3074 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3075 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3076 | total_found++; |
| 3077 | cur_byte = found_key.objectid + found_key.offset; |
| 3078 | key.objectid = cur_byte; |
| 3079 | btrfs_release_path(root, path); |
| 3080 | ret = relocate_one_extent(root, path, &found_key); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3081 | __alloc_chunk_for_shrink(root, shrink_block_group, 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3082 | } |
| 3083 | |
| 3084 | btrfs_release_path(root, path); |
| 3085 | |
| 3086 | if (total_found > 0) { |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 3087 | printk("btrfs relocate found %llu last extent was %llu\n", |
| 3088 | (unsigned long long)total_found, |
| 3089 | (unsigned long long)found_key.objectid); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3090 | trans = btrfs_start_transaction(tree_root, 1); |
| 3091 | btrfs_commit_transaction(trans, tree_root); |
| 3092 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3093 | btrfs_clean_old_snapshots(tree_root); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3094 | |
| 3095 | trans = btrfs_start_transaction(tree_root, 1); |
| 3096 | btrfs_commit_transaction(trans, tree_root); |
| 3097 | goto again; |
| 3098 | } |
| 3099 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3100 | /* |
| 3101 | * we've freed all the extents, now remove the block |
| 3102 | * group item from the tree |
| 3103 | */ |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3104 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3105 | memcpy(&key, &shrink_block_group->key, sizeof(key)); |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 3106 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3107 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 3108 | if (ret > 0) |
| 3109 | ret = -EIO; |
| 3110 | if (ret < 0) |
| 3111 | goto out; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3112 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3113 | clear_extent_bits(&info->block_group_cache, key.objectid, |
| 3114 | key.objectid + key.offset - 1, |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3115 | (unsigned int)-1, GFP_NOFS); |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 3116 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3117 | |
| 3118 | clear_extent_bits(&info->free_space_cache, |
| 3119 | key.objectid, key.objectid + key.offset - 1, |
| 3120 | (unsigned int)-1, GFP_NOFS); |
| 3121 | |
| 3122 | memset(shrink_block_group, 0, sizeof(*shrink_block_group)); |
| 3123 | kfree(shrink_block_group); |
| 3124 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3125 | btrfs_del_item(trans, root, path); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3126 | btrfs_commit_transaction(trans, root); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3127 | |
| 3128 | /* the code to unpin extents might set a few bits in the free |
| 3129 | * space cache for this range again |
| 3130 | */ |
| 3131 | clear_extent_bits(&info->free_space_cache, |
| 3132 | key.objectid, key.objectid + key.offset - 1, |
| 3133 | (unsigned int)-1, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3134 | out: |
| 3135 | btrfs_free_path(path); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3136 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 3137 | return ret; |
| 3138 | } |
| 3139 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3140 | int find_first_block_group(struct btrfs_root *root, struct btrfs_path *path, |
| 3141 | struct btrfs_key *key) |
| 3142 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3143 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3144 | struct btrfs_key found_key; |
| 3145 | struct extent_buffer *leaf; |
| 3146 | int slot; |
| 3147 | |
| 3148 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 3149 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3150 | goto out; |
| 3151 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3152 | while(1) { |
| 3153 | slot = path->slots[0]; |
| 3154 | leaf = path->nodes[0]; |
| 3155 | if (slot >= btrfs_header_nritems(leaf)) { |
| 3156 | ret = btrfs_next_leaf(root, path); |
| 3157 | if (ret == 0) |
| 3158 | continue; |
| 3159 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3160 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3161 | break; |
| 3162 | } |
| 3163 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 3164 | |
| 3165 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3166 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 3167 | ret = 0; |
| 3168 | goto out; |
| 3169 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3170 | path->slots[0]++; |
| 3171 | } |
| 3172 | ret = -ENOENT; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3173 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3174 | return ret; |
| 3175 | } |
| 3176 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3177 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 3178 | { |
| 3179 | struct btrfs_path *path; |
| 3180 | int ret; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3181 | int bit; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3182 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 3183 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3184 | struct btrfs_space_info *space_info; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3185 | struct extent_io_tree *block_group_cache; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3186 | struct btrfs_key key; |
| 3187 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3188 | struct extent_buffer *leaf; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3189 | |
| 3190 | block_group_cache = &info->block_group_cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 3191 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3192 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3193 | key.offset = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3194 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3195 | path = btrfs_alloc_path(); |
| 3196 | if (!path) |
| 3197 | return -ENOMEM; |
| 3198 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3199 | mutex_lock(&root->fs_info->alloc_mutex); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3200 | while(1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3201 | ret = find_first_block_group(root, path, &key); |
| 3202 | if (ret > 0) { |
| 3203 | ret = 0; |
| 3204 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3205 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3206 | if (ret != 0) |
| 3207 | goto error; |
| 3208 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3209 | leaf = path->nodes[0]; |
| 3210 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3211 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3212 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3213 | ret = -ENOMEM; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3214 | break; |
| 3215 | } |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 3216 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3217 | read_extent_buffer(leaf, &cache->item, |
| 3218 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 3219 | sizeof(cache->item)); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3220 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3221 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3222 | key.objectid = found_key.objectid + found_key.offset; |
| 3223 | btrfs_release_path(root, path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3224 | cache->flags = btrfs_block_group_flags(&cache->item); |
| 3225 | bit = 0; |
| 3226 | if (cache->flags & BTRFS_BLOCK_GROUP_DATA) { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3227 | bit = BLOCK_GROUP_DATA; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3228 | } else if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { |
| 3229 | bit = BLOCK_GROUP_SYSTEM; |
| 3230 | } else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3231 | bit = BLOCK_GROUP_METADATA; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 3232 | } |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3233 | set_avail_alloc_bits(info, cache->flags); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3234 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3235 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 3236 | btrfs_block_group_used(&cache->item), |
| 3237 | &space_info); |
| 3238 | BUG_ON(ret); |
| 3239 | cache->space_info = space_info; |
| 3240 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3241 | /* use EXTENT_LOCKED to prevent merging */ |
| 3242 | set_extent_bits(block_group_cache, found_key.objectid, |
| 3243 | found_key.objectid + found_key.offset - 1, |
| 3244 | bit | EXTENT_LOCKED, GFP_NOFS); |
| 3245 | set_state_private(block_group_cache, found_key.objectid, |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 3246 | (unsigned long)cache); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 3247 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3248 | if (key.objectid >= |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3249 | btrfs_super_total_bytes(&info->super_copy)) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3250 | break; |
| 3251 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3252 | ret = 0; |
| 3253 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3254 | btrfs_free_path(path); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3255 | mutex_unlock(&root->fs_info->alloc_mutex); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3256 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 3257 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3258 | |
| 3259 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 3260 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3261 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3262 | u64 size) |
| 3263 | { |
| 3264 | int ret; |
| 3265 | int bit = 0; |
| 3266 | struct btrfs_root *extent_root; |
| 3267 | struct btrfs_block_group_cache *cache; |
| 3268 | struct extent_io_tree *block_group_cache; |
| 3269 | |
| 3270 | extent_root = root->fs_info->extent_root; |
| 3271 | block_group_cache = &root->fs_info->block_group_cache; |
| 3272 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 3273 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3274 | BUG_ON(!cache); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3275 | cache->key.objectid = chunk_offset; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3276 | cache->key.offset = size; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3277 | btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3278 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3279 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3280 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
| 3281 | cache->flags = type; |
| 3282 | btrfs_set_block_group_flags(&cache->item, type); |
| 3283 | |
| 3284 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 3285 | &cache->space_info); |
| 3286 | BUG_ON(ret); |
| 3287 | |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 3288 | bit = block_group_state_bits(type); |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3289 | set_extent_bits(block_group_cache, chunk_offset, |
| 3290 | chunk_offset + size - 1, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3291 | bit | EXTENT_LOCKED, GFP_NOFS); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3292 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 3293 | set_state_private(block_group_cache, chunk_offset, |
| 3294 | (unsigned long)cache); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3295 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
| 3296 | sizeof(cache->item)); |
| 3297 | BUG_ON(ret); |
| 3298 | |
| 3299 | finish_current_insert(trans, extent_root); |
| 3300 | ret = del_pending_extents(trans, extent_root); |
| 3301 | BUG_ON(ret); |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 3302 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3303 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3304 | return 0; |
| 3305 | } |