Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * the_nilfs.c - the_nilfs shared structure. |
| 3 | * |
| 4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/buffer_head.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/blkdev.h> |
| 27 | #include <linux/backing-dev.h> |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 28 | #include <linux/crc32.h> |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 29 | #include "nilfs.h" |
| 30 | #include "segment.h" |
| 31 | #include "alloc.h" |
| 32 | #include "cpfile.h" |
| 33 | #include "sufile.h" |
| 34 | #include "dat.h" |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 35 | #include "segbuf.h" |
| 36 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 37 | |
| 38 | static LIST_HEAD(nilfs_objects); |
| 39 | static DEFINE_SPINLOCK(nilfs_lock); |
| 40 | |
Ryusuke Konishi | 6c125160 | 2010-06-28 19:15:26 +0900 | [diff] [blame] | 41 | static int nilfs_valid_sb(struct nilfs_super_block *sbp); |
| 42 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 43 | void nilfs_set_last_segment(struct the_nilfs *nilfs, |
| 44 | sector_t start_blocknr, u64 seq, __u64 cno) |
| 45 | { |
| 46 | spin_lock(&nilfs->ns_last_segment_lock); |
| 47 | nilfs->ns_last_pseg = start_blocknr; |
| 48 | nilfs->ns_last_seq = seq; |
| 49 | nilfs->ns_last_cno = cno; |
Ryusuke Konishi | 3250204 | 2010-06-29 14:42:13 +0900 | [diff] [blame] | 50 | |
| 51 | if (!nilfs_sb_dirty(nilfs)) { |
| 52 | if (nilfs->ns_prev_seq == nilfs->ns_last_seq) |
| 53 | goto stay_cursor; |
| 54 | |
| 55 | set_nilfs_sb_dirty(nilfs); |
| 56 | } |
| 57 | nilfs->ns_prev_seq = nilfs->ns_last_seq; |
| 58 | |
| 59 | stay_cursor: |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 60 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * alloc_nilfs - allocate the_nilfs structure |
| 65 | * @bdev: block device to which the_nilfs is related |
| 66 | * |
| 67 | * alloc_nilfs() allocates memory for the_nilfs and |
| 68 | * initializes its reference count and locks. |
| 69 | * |
| 70 | * Return Value: On success, pointer to the_nilfs is returned. |
| 71 | * On error, NULL is returned. |
| 72 | */ |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 73 | static struct the_nilfs *alloc_nilfs(struct block_device *bdev) |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 74 | { |
| 75 | struct the_nilfs *nilfs; |
| 76 | |
| 77 | nilfs = kzalloc(sizeof(*nilfs), GFP_KERNEL); |
| 78 | if (!nilfs) |
| 79 | return NULL; |
| 80 | |
| 81 | nilfs->ns_bdev = bdev; |
| 82 | atomic_set(&nilfs->ns_count, 1); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 83 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
| 84 | init_rwsem(&nilfs->ns_sem); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 85 | init_rwsem(&nilfs->ns_super_sem); |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 86 | mutex_init(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 027d640 | 2009-08-02 22:45:33 +0900 | [diff] [blame] | 87 | init_rwsem(&nilfs->ns_writer_sem); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 88 | INIT_LIST_HEAD(&nilfs->ns_list); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 89 | INIT_LIST_HEAD(&nilfs->ns_supers); |
| 90 | spin_lock_init(&nilfs->ns_last_segment_lock); |
| 91 | nilfs->ns_gc_inodes_h = NULL; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 92 | init_rwsem(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 93 | |
| 94 | return nilfs; |
| 95 | } |
| 96 | |
| 97 | /** |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 98 | * find_or_create_nilfs - find or create nilfs object |
| 99 | * @bdev: block device to which the_nilfs is related |
| 100 | * |
| 101 | * find_nilfs() looks up an existent nilfs object created on the |
| 102 | * device and gets the reference count of the object. If no nilfs object |
| 103 | * is found on the device, a new nilfs object is allocated. |
| 104 | * |
| 105 | * Return Value: On success, pointer to the nilfs object is returned. |
| 106 | * On error, NULL is returned. |
| 107 | */ |
| 108 | struct the_nilfs *find_or_create_nilfs(struct block_device *bdev) |
| 109 | { |
| 110 | struct the_nilfs *nilfs, *new = NULL; |
| 111 | |
| 112 | retry: |
| 113 | spin_lock(&nilfs_lock); |
| 114 | list_for_each_entry(nilfs, &nilfs_objects, ns_list) { |
| 115 | if (nilfs->ns_bdev == bdev) { |
| 116 | get_nilfs(nilfs); |
| 117 | spin_unlock(&nilfs_lock); |
| 118 | if (new) |
| 119 | put_nilfs(new); |
| 120 | return nilfs; /* existing object */ |
| 121 | } |
| 122 | } |
| 123 | if (new) { |
| 124 | list_add_tail(&new->ns_list, &nilfs_objects); |
| 125 | spin_unlock(&nilfs_lock); |
| 126 | return new; /* new object */ |
| 127 | } |
| 128 | spin_unlock(&nilfs_lock); |
| 129 | |
| 130 | new = alloc_nilfs(bdev); |
| 131 | if (new) |
| 132 | goto retry; |
| 133 | return NULL; /* insufficient memory */ |
| 134 | } |
| 135 | |
| 136 | /** |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 137 | * put_nilfs - release a reference to the_nilfs |
| 138 | * @nilfs: the_nilfs structure to be released |
| 139 | * |
| 140 | * put_nilfs() decrements a reference counter of the_nilfs. |
| 141 | * If the reference count reaches zero, the_nilfs is freed. |
| 142 | */ |
| 143 | void put_nilfs(struct the_nilfs *nilfs) |
| 144 | { |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 145 | spin_lock(&nilfs_lock); |
| 146 | if (!atomic_dec_and_test(&nilfs->ns_count)) { |
| 147 | spin_unlock(&nilfs_lock); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 148 | return; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 149 | } |
| 150 | list_del_init(&nilfs->ns_list); |
| 151 | spin_unlock(&nilfs_lock); |
| 152 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 153 | /* |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 154 | * Increment of ns_count never occurs below because the caller |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 155 | * of get_nilfs() holds at least one reference to the_nilfs. |
| 156 | * Thus its exclusion control is not required here. |
| 157 | */ |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 158 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 159 | might_sleep(); |
| 160 | if (nilfs_loaded(nilfs)) { |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 161 | nilfs_mdt_destroy(nilfs->ns_sufile); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 162 | nilfs_mdt_destroy(nilfs->ns_cpfile); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 163 | nilfs_mdt_destroy(nilfs->ns_dat); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 164 | nilfs_mdt_destroy(nilfs->ns_gc_dat); |
| 165 | } |
| 166 | if (nilfs_init(nilfs)) { |
| 167 | nilfs_destroy_gccache(nilfs); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 168 | brelse(nilfs->ns_sbh[0]); |
| 169 | brelse(nilfs->ns_sbh[1]); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 170 | } |
| 171 | kfree(nilfs); |
| 172 | } |
| 173 | |
Ryusuke Konishi | 8b94025 | 2010-05-23 01:39:02 +0900 | [diff] [blame] | 174 | static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block) |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 175 | { |
| 176 | struct buffer_head *bh_sr; |
| 177 | struct nilfs_super_root *raw_sr; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 178 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 179 | unsigned dat_entry_size, segment_usage_size, checkpoint_size; |
| 180 | unsigned inode_size; |
| 181 | int err; |
| 182 | |
Ryusuke Konishi | 8b94025 | 2010-05-23 01:39:02 +0900 | [diff] [blame] | 183 | err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 184 | if (unlikely(err)) |
| 185 | return err; |
| 186 | |
| 187 | down_read(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 188 | dat_entry_size = le16_to_cpu(sbp[0]->s_dat_entry_size); |
| 189 | checkpoint_size = le16_to_cpu(sbp[0]->s_checkpoint_size); |
| 190 | segment_usage_size = le16_to_cpu(sbp[0]->s_segment_usage_size); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 191 | up_read(&nilfs->ns_sem); |
| 192 | |
| 193 | inode_size = nilfs->ns_inode_size; |
| 194 | |
| 195 | err = -ENOMEM; |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 196 | nilfs->ns_dat = nilfs_dat_new(nilfs, dat_entry_size); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 197 | if (unlikely(!nilfs->ns_dat)) |
| 198 | goto failed; |
| 199 | |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 200 | nilfs->ns_gc_dat = nilfs_dat_new(nilfs, dat_entry_size); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 201 | if (unlikely(!nilfs->ns_gc_dat)) |
| 202 | goto failed_dat; |
| 203 | |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 204 | nilfs->ns_cpfile = nilfs_cpfile_new(nilfs, checkpoint_size); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 205 | if (unlikely(!nilfs->ns_cpfile)) |
| 206 | goto failed_gc_dat; |
| 207 | |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 208 | nilfs->ns_sufile = nilfs_sufile_new(nilfs, segment_usage_size); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 209 | if (unlikely(!nilfs->ns_sufile)) |
| 210 | goto failed_cpfile; |
| 211 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 212 | nilfs_mdt_set_shadow(nilfs->ns_dat, nilfs->ns_gc_dat); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 213 | |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 214 | err = nilfs_dat_read(nilfs->ns_dat, (void *)bh_sr->b_data + |
| 215 | NILFS_SR_DAT_OFFSET(inode_size)); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 216 | if (unlikely(err)) |
| 217 | goto failed_sufile; |
| 218 | |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 219 | err = nilfs_cpfile_read(nilfs->ns_cpfile, (void *)bh_sr->b_data + |
| 220 | NILFS_SR_CPFILE_OFFSET(inode_size)); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 221 | if (unlikely(err)) |
| 222 | goto failed_sufile; |
| 223 | |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 224 | err = nilfs_sufile_read(nilfs->ns_sufile, (void *)bh_sr->b_data + |
| 225 | NILFS_SR_SUFILE_OFFSET(inode_size)); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 226 | if (unlikely(err)) |
| 227 | goto failed_sufile; |
| 228 | |
| 229 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; |
| 230 | nilfs->ns_nongc_ctime = le64_to_cpu(raw_sr->sr_nongc_ctime); |
| 231 | |
| 232 | failed: |
| 233 | brelse(bh_sr); |
| 234 | return err; |
| 235 | |
| 236 | failed_sufile: |
| 237 | nilfs_mdt_destroy(nilfs->ns_sufile); |
| 238 | |
| 239 | failed_cpfile: |
| 240 | nilfs_mdt_destroy(nilfs->ns_cpfile); |
| 241 | |
| 242 | failed_gc_dat: |
| 243 | nilfs_mdt_destroy(nilfs->ns_gc_dat); |
| 244 | |
| 245 | failed_dat: |
| 246 | nilfs_mdt_destroy(nilfs->ns_dat); |
| 247 | goto failed; |
| 248 | } |
| 249 | |
| 250 | static void nilfs_init_recovery_info(struct nilfs_recovery_info *ri) |
| 251 | { |
| 252 | memset(ri, 0, sizeof(*ri)); |
| 253 | INIT_LIST_HEAD(&ri->ri_used_segments); |
| 254 | } |
| 255 | |
| 256 | static void nilfs_clear_recovery_info(struct nilfs_recovery_info *ri) |
| 257 | { |
| 258 | nilfs_dispose_segment_list(&ri->ri_used_segments); |
| 259 | } |
| 260 | |
| 261 | /** |
Ryusuke Konishi | 843d63ba | 2010-06-28 19:15:24 +0900 | [diff] [blame] | 262 | * nilfs_store_log_cursor - load log cursor from a super block |
| 263 | * @nilfs: nilfs object |
| 264 | * @sbp: buffer storing super block to be read |
| 265 | * |
| 266 | * nilfs_store_log_cursor() reads the last position of the log |
| 267 | * containing a super root from a given super block, and initializes |
| 268 | * relevant information on the nilfs object preparatory for log |
| 269 | * scanning and recovery. |
| 270 | */ |
| 271 | static int nilfs_store_log_cursor(struct the_nilfs *nilfs, |
| 272 | struct nilfs_super_block *sbp) |
| 273 | { |
| 274 | int ret = 0; |
| 275 | |
| 276 | nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg); |
| 277 | nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno); |
| 278 | nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq); |
| 279 | |
Ryusuke Konishi | 3250204 | 2010-06-29 14:42:13 +0900 | [diff] [blame] | 280 | nilfs->ns_prev_seq = nilfs->ns_last_seq; |
Ryusuke Konishi | 843d63ba | 2010-06-28 19:15:24 +0900 | [diff] [blame] | 281 | nilfs->ns_seg_seq = nilfs->ns_last_seq; |
| 282 | nilfs->ns_segnum = |
| 283 | nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg); |
| 284 | nilfs->ns_cno = nilfs->ns_last_cno + 1; |
| 285 | if (nilfs->ns_segnum >= nilfs->ns_nsegments) { |
| 286 | printk(KERN_ERR "NILFS invalid last segment number.\n"); |
| 287 | ret = -EINVAL; |
| 288 | } |
| 289 | return ret; |
| 290 | } |
| 291 | |
| 292 | /** |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 293 | * load_nilfs - load and recover the nilfs |
| 294 | * @nilfs: the_nilfs structure to be released |
| 295 | * @sbi: nilfs_sb_info used to recover past segment |
| 296 | * |
| 297 | * load_nilfs() searches and load the latest super root, |
| 298 | * attaches the last segment, and does recovery if needed. |
| 299 | * The caller must call this exclusively for simultaneous mounts. |
| 300 | */ |
| 301 | int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) |
| 302 | { |
| 303 | struct nilfs_recovery_info ri; |
| 304 | unsigned int s_flags = sbi->s_super->s_flags; |
| 305 | int really_read_only = bdev_read_only(nilfs->ns_bdev); |
Ryusuke Konishi | a057d2c | 2009-11-19 19:58:46 +0900 | [diff] [blame] | 306 | int valid_fs = nilfs_valid_fs(nilfs); |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 307 | int err; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 308 | |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 309 | if (nilfs_loaded(nilfs)) { |
| 310 | if (valid_fs || |
| 311 | ((s_flags & MS_RDONLY) && nilfs_test_opt(sbi, NORECOVERY))) |
| 312 | return 0; |
| 313 | printk(KERN_ERR "NILFS: the filesystem is in an incomplete " |
| 314 | "recovery state.\n"); |
| 315 | return -EINVAL; |
| 316 | } |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 317 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 318 | if (!valid_fs) { |
| 319 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); |
| 320 | if (s_flags & MS_RDONLY) { |
| 321 | printk(KERN_INFO "NILFS: INFO: recovery " |
| 322 | "required for readonly filesystem.\n"); |
| 323 | printk(KERN_INFO "NILFS: write access will " |
| 324 | "be enabled during recovery.\n"); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 325 | } |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 326 | } |
| 327 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 328 | nilfs_init_recovery_info(&ri); |
| 329 | |
Ryusuke Konishi | 8b94025 | 2010-05-23 01:39:02 +0900 | [diff] [blame] | 330 | err = nilfs_search_super_root(nilfs, &ri); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 331 | if (unlikely(err)) { |
Ryusuke Konishi | 6c125160 | 2010-06-28 19:15:26 +0900 | [diff] [blame] | 332 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| 333 | int blocksize; |
| 334 | |
| 335 | if (err != -EINVAL) |
| 336 | goto scan_error; |
| 337 | |
| 338 | if (!nilfs_valid_sb(sbp[1])) { |
| 339 | printk(KERN_WARNING |
| 340 | "NILFS warning: unable to fall back to spare" |
| 341 | "super block\n"); |
| 342 | goto scan_error; |
| 343 | } |
| 344 | printk(KERN_INFO |
| 345 | "NILFS: try rollback from an earlier position\n"); |
| 346 | |
| 347 | /* |
| 348 | * restore super block with its spare and reconfigure |
| 349 | * relevant states of the nilfs object. |
| 350 | */ |
| 351 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
| 352 | nilfs->ns_crc_seed = le32_to_cpu(sbp[0]->s_crc_seed); |
| 353 | nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); |
| 354 | |
| 355 | /* verify consistency between two super blocks */ |
| 356 | blocksize = BLOCK_SIZE << le32_to_cpu(sbp[0]->s_log_block_size); |
| 357 | if (blocksize != nilfs->ns_blocksize) { |
| 358 | printk(KERN_WARNING |
| 359 | "NILFS warning: blocksize differs between " |
| 360 | "two super blocks (%d != %d)\n", |
| 361 | blocksize, nilfs->ns_blocksize); |
| 362 | goto scan_error; |
| 363 | } |
| 364 | |
| 365 | err = nilfs_store_log_cursor(nilfs, sbp[0]); |
| 366 | if (err) |
| 367 | goto scan_error; |
| 368 | |
| 369 | /* drop clean flag to allow roll-forward and recovery */ |
| 370 | nilfs->ns_mount_state &= ~NILFS_VALID_FS; |
| 371 | valid_fs = 0; |
| 372 | |
| 373 | err = nilfs_search_super_root(nilfs, &ri); |
| 374 | if (err) |
| 375 | goto scan_error; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 376 | } |
| 377 | |
Ryusuke Konishi | 8b94025 | 2010-05-23 01:39:02 +0900 | [diff] [blame] | 378 | err = nilfs_load_super_root(nilfs, ri.ri_super_root); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 379 | if (unlikely(err)) { |
| 380 | printk(KERN_ERR "NILFS: error loading super root.\n"); |
| 381 | goto failed; |
| 382 | } |
| 383 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 384 | if (valid_fs) |
| 385 | goto skip_recovery; |
| 386 | |
| 387 | if (s_flags & MS_RDONLY) { |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 388 | __u64 features; |
| 389 | |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 390 | if (nilfs_test_opt(sbi, NORECOVERY)) { |
| 391 | printk(KERN_INFO "NILFS: norecovery option specified. " |
| 392 | "skipping roll-forward recovery\n"); |
| 393 | goto skip_recovery; |
| 394 | } |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 395 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & |
| 396 | ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| 397 | if (features) { |
| 398 | printk(KERN_ERR "NILFS: couldn't proceed with " |
| 399 | "recovery because of unsupported optional " |
| 400 | "features (%llx)\n", |
| 401 | (unsigned long long)features); |
| 402 | err = -EROFS; |
| 403 | goto failed_unload; |
| 404 | } |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 405 | if (really_read_only) { |
| 406 | printk(KERN_ERR "NILFS: write access " |
| 407 | "unavailable, cannot proceed.\n"); |
| 408 | err = -EROFS; |
| 409 | goto failed_unload; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 410 | } |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 411 | sbi->s_super->s_flags &= ~MS_RDONLY; |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 412 | } else if (nilfs_test_opt(sbi, NORECOVERY)) { |
| 413 | printk(KERN_ERR "NILFS: recovery cancelled because norecovery " |
| 414 | "option was specified for a read/write mount\n"); |
| 415 | err = -EINVAL; |
| 416 | goto failed_unload; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Ryusuke Konishi | aee5ce2 | 2010-05-23 12:21:57 +0900 | [diff] [blame] | 419 | err = nilfs_salvage_orphan_logs(nilfs, sbi, &ri); |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 420 | if (err) |
| 421 | goto failed_unload; |
| 422 | |
| 423 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 424 | nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */ |
| 425 | err = nilfs_cleanup_super(sbi); |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 426 | up_write(&nilfs->ns_sem); |
| 427 | |
| 428 | if (err) { |
| 429 | printk(KERN_ERR "NILFS: failed to update super block. " |
| 430 | "recovery unfinished.\n"); |
| 431 | goto failed_unload; |
| 432 | } |
| 433 | printk(KERN_INFO "NILFS: recovery complete.\n"); |
| 434 | |
| 435 | skip_recovery: |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 436 | set_nilfs_loaded(nilfs); |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 437 | nilfs_clear_recovery_info(&ri); |
| 438 | sbi->s_super->s_flags = s_flags; |
| 439 | return 0; |
| 440 | |
Ryusuke Konishi | 6c125160 | 2010-06-28 19:15:26 +0900 | [diff] [blame] | 441 | scan_error: |
| 442 | printk(KERN_ERR "NILFS: error searching super root.\n"); |
| 443 | goto failed; |
| 444 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 445 | failed_unload: |
| 446 | nilfs_mdt_destroy(nilfs->ns_cpfile); |
| 447 | nilfs_mdt_destroy(nilfs->ns_sufile); |
| 448 | nilfs_mdt_destroy(nilfs->ns_dat); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 449 | |
| 450 | failed: |
| 451 | nilfs_clear_recovery_info(&ri); |
| 452 | sbi->s_super->s_flags = s_flags; |
| 453 | return err; |
| 454 | } |
| 455 | |
| 456 | static unsigned long long nilfs_max_size(unsigned int blkbits) |
| 457 | { |
| 458 | unsigned int max_bits; |
| 459 | unsigned long long res = MAX_LFS_FILESIZE; /* page cache limit */ |
| 460 | |
| 461 | max_bits = blkbits + NILFS_BMAP_KEY_BIT; /* bmap size limit */ |
| 462 | if (max_bits < 64) |
| 463 | res = min_t(unsigned long long, res, (1ULL << max_bits) - 1); |
| 464 | return res; |
| 465 | } |
| 466 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 467 | static int nilfs_store_disk_layout(struct the_nilfs *nilfs, |
| 468 | struct nilfs_super_block *sbp) |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 469 | { |
| 470 | if (le32_to_cpu(sbp->s_rev_level) != NILFS_CURRENT_REV) { |
| 471 | printk(KERN_ERR "NILFS: revision mismatch " |
| 472 | "(superblock rev.=%d.%d, current rev.=%d.%d). " |
| 473 | "Please check the version of mkfs.nilfs.\n", |
| 474 | le32_to_cpu(sbp->s_rev_level), |
| 475 | le16_to_cpu(sbp->s_minor_rev_level), |
| 476 | NILFS_CURRENT_REV, NILFS_MINOR_REV); |
| 477 | return -EINVAL; |
| 478 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 479 | nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes); |
| 480 | if (nilfs->ns_sbsize > BLOCK_SIZE) |
| 481 | return -EINVAL; |
| 482 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 483 | nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size); |
| 484 | nilfs->ns_first_ino = le32_to_cpu(sbp->s_first_ino); |
| 485 | |
| 486 | nilfs->ns_blocks_per_segment = le32_to_cpu(sbp->s_blocks_per_segment); |
| 487 | if (nilfs->ns_blocks_per_segment < NILFS_SEG_MIN_BLOCKS) { |
Ryusuke Konishi | c91cea1 | 2010-03-14 04:01:27 +0900 | [diff] [blame] | 488 | printk(KERN_ERR "NILFS: too short segment.\n"); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 489 | return -EINVAL; |
| 490 | } |
| 491 | |
| 492 | nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block); |
| 493 | nilfs->ns_nsegments = le64_to_cpu(sbp->s_nsegments); |
| 494 | nilfs->ns_r_segments_percentage = |
| 495 | le32_to_cpu(sbp->s_r_segments_percentage); |
| 496 | nilfs->ns_nrsvsegs = |
| 497 | max_t(unsigned long, NILFS_MIN_NRSVSEGS, |
| 498 | DIV_ROUND_UP(nilfs->ns_nsegments * |
| 499 | nilfs->ns_r_segments_percentage, 100)); |
| 500 | nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed); |
| 501 | return 0; |
| 502 | } |
| 503 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 504 | static int nilfs_valid_sb(struct nilfs_super_block *sbp) |
| 505 | { |
| 506 | static unsigned char sum[4]; |
| 507 | const int sumoff = offsetof(struct nilfs_super_block, s_sum); |
| 508 | size_t bytes; |
| 509 | u32 crc; |
| 510 | |
| 511 | if (!sbp || le16_to_cpu(sbp->s_magic) != NILFS_SUPER_MAGIC) |
| 512 | return 0; |
| 513 | bytes = le16_to_cpu(sbp->s_bytes); |
| 514 | if (bytes > BLOCK_SIZE) |
| 515 | return 0; |
| 516 | crc = crc32_le(le32_to_cpu(sbp->s_crc_seed), (unsigned char *)sbp, |
| 517 | sumoff); |
| 518 | crc = crc32_le(crc, sum, 4); |
| 519 | crc = crc32_le(crc, (unsigned char *)sbp + sumoff + 4, |
| 520 | bytes - sumoff - 4); |
| 521 | return crc == le32_to_cpu(sbp->s_sum); |
| 522 | } |
| 523 | |
| 524 | static int nilfs_sb2_bad_offset(struct nilfs_super_block *sbp, u64 offset) |
| 525 | { |
| 526 | return offset < ((le64_to_cpu(sbp->s_nsegments) * |
| 527 | le32_to_cpu(sbp->s_blocks_per_segment)) << |
| 528 | (le32_to_cpu(sbp->s_log_block_size) + 10)); |
| 529 | } |
| 530 | |
| 531 | static void nilfs_release_super_block(struct the_nilfs *nilfs) |
| 532 | { |
| 533 | int i; |
| 534 | |
| 535 | for (i = 0; i < 2; i++) { |
| 536 | if (nilfs->ns_sbp[i]) { |
| 537 | brelse(nilfs->ns_sbh[i]); |
| 538 | nilfs->ns_sbh[i] = NULL; |
| 539 | nilfs->ns_sbp[i] = NULL; |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | void nilfs_fall_back_super_block(struct the_nilfs *nilfs) |
| 545 | { |
| 546 | brelse(nilfs->ns_sbh[0]); |
| 547 | nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; |
| 548 | nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; |
| 549 | nilfs->ns_sbh[1] = NULL; |
| 550 | nilfs->ns_sbp[1] = NULL; |
| 551 | } |
| 552 | |
| 553 | void nilfs_swap_super_block(struct the_nilfs *nilfs) |
| 554 | { |
| 555 | struct buffer_head *tsbh = nilfs->ns_sbh[0]; |
| 556 | struct nilfs_super_block *tsbp = nilfs->ns_sbp[0]; |
| 557 | |
| 558 | nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; |
| 559 | nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; |
| 560 | nilfs->ns_sbh[1] = tsbh; |
| 561 | nilfs->ns_sbp[1] = tsbp; |
| 562 | } |
| 563 | |
| 564 | static int nilfs_load_super_block(struct the_nilfs *nilfs, |
| 565 | struct super_block *sb, int blocksize, |
| 566 | struct nilfs_super_block **sbpp) |
| 567 | { |
| 568 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| 569 | struct buffer_head **sbh = nilfs->ns_sbh; |
| 570 | u64 sb2off = NILFS_SB2_OFFSET_BYTES(nilfs->ns_bdev->bd_inode->i_size); |
| 571 | int valid[2], swp = 0; |
| 572 | |
| 573 | sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize, |
| 574 | &sbh[0]); |
| 575 | sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]); |
| 576 | |
| 577 | if (!sbp[0]) { |
| 578 | if (!sbp[1]) { |
| 579 | printk(KERN_ERR "NILFS: unable to read superblock\n"); |
| 580 | return -EIO; |
| 581 | } |
| 582 | printk(KERN_WARNING |
| 583 | "NILFS warning: unable to read primary superblock\n"); |
| 584 | } else if (!sbp[1]) |
| 585 | printk(KERN_WARNING |
| 586 | "NILFS warning: unable to read secondary superblock\n"); |
| 587 | |
Ryusuke Konishi | 25294d8 | 2010-05-01 11:54:21 +0900 | [diff] [blame] | 588 | /* |
| 589 | * Compare two super blocks and set 1 in swp if the secondary |
| 590 | * super block is valid and newer. Otherwise, set 0 in swp. |
| 591 | */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 592 | valid[0] = nilfs_valid_sb(sbp[0]); |
| 593 | valid[1] = nilfs_valid_sb(sbp[1]); |
Ryusuke Konishi | 25294d8 | 2010-05-01 11:54:21 +0900 | [diff] [blame] | 594 | swp = valid[1] && (!valid[0] || |
| 595 | le64_to_cpu(sbp[1]->s_last_cno) > |
| 596 | le64_to_cpu(sbp[0]->s_last_cno)); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 597 | |
| 598 | if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) { |
| 599 | brelse(sbh[1]); |
| 600 | sbh[1] = NULL; |
| 601 | sbp[1] = NULL; |
| 602 | swp = 0; |
| 603 | } |
| 604 | if (!valid[swp]) { |
| 605 | nilfs_release_super_block(nilfs); |
| 606 | printk(KERN_ERR "NILFS: Can't find nilfs on dev %s.\n", |
| 607 | sb->s_id); |
| 608 | return -EINVAL; |
| 609 | } |
| 610 | |
| 611 | if (swp) { |
| 612 | printk(KERN_WARNING "NILFS warning: broken superblock. " |
| 613 | "using spare superblock.\n"); |
| 614 | nilfs_swap_super_block(nilfs); |
| 615 | } |
| 616 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 617 | nilfs->ns_sbwcount = 0; |
| 618 | nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 619 | nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); |
| 620 | *sbpp = sbp[0]; |
| 621 | return 0; |
| 622 | } |
| 623 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 624 | /** |
| 625 | * init_nilfs - initialize a NILFS instance. |
| 626 | * @nilfs: the_nilfs structure |
| 627 | * @sbi: nilfs_sb_info |
| 628 | * @sb: super block |
| 629 | * @data: mount options |
| 630 | * |
| 631 | * init_nilfs() performs common initialization per block device (e.g. |
| 632 | * reading the super block, getting disk layout information, initializing |
| 633 | * shared fields in the_nilfs). It takes on some portion of the jobs |
| 634 | * typically done by a fill_super() routine. This division arises from |
| 635 | * the nature that multiple NILFS instances may be simultaneously |
| 636 | * mounted on a device. |
| 637 | * For multiple mounts on the same device, only the first mount |
| 638 | * invokes these tasks. |
| 639 | * |
| 640 | * Return Value: On success, 0 is returned. On error, a negative error |
| 641 | * code is returned. |
| 642 | */ |
| 643 | int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) |
| 644 | { |
| 645 | struct super_block *sb = sbi->s_super; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 646 | struct nilfs_super_block *sbp; |
| 647 | struct backing_dev_info *bdi; |
| 648 | int blocksize; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 649 | int err; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 650 | |
| 651 | down_write(&nilfs->ns_sem); |
| 652 | if (nilfs_init(nilfs)) { |
| 653 | /* Load values from existing the_nilfs */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 654 | sbp = nilfs->ns_sbp[0]; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 655 | err = nilfs_store_magic_and_option(sb, sbp, data); |
| 656 | if (err) |
| 657 | goto out; |
| 658 | |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 659 | err = nilfs_check_feature_compatibility(sb, sbp); |
| 660 | if (err) |
| 661 | goto out; |
| 662 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 663 | blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); |
| 664 | if (sb->s_blocksize != blocksize && |
| 665 | !sb_set_blocksize(sb, blocksize)) { |
| 666 | printk(KERN_ERR "NILFS: blocksize %d unfit to device\n", |
| 667 | blocksize); |
| 668 | err = -EINVAL; |
| 669 | } |
| 670 | sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); |
| 671 | goto out; |
| 672 | } |
| 673 | |
Ryusuke Konishi | 89c0fd0 | 2010-07-25 22:44:53 +0900 | [diff] [blame^] | 674 | blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 675 | if (!blocksize) { |
| 676 | printk(KERN_ERR "NILFS: unable to set blocksize\n"); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 677 | err = -EINVAL; |
| 678 | goto out; |
| 679 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 680 | err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); |
| 681 | if (err) |
| 682 | goto out; |
| 683 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 684 | err = nilfs_store_magic_and_option(sb, sbp, data); |
| 685 | if (err) |
| 686 | goto failed_sbh; |
| 687 | |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 688 | err = nilfs_check_feature_compatibility(sb, sbp); |
| 689 | if (err) |
| 690 | goto failed_sbh; |
| 691 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 692 | blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); |
Ryusuke Konishi | 89c0fd0 | 2010-07-25 22:44:53 +0900 | [diff] [blame^] | 693 | if (blocksize < NILFS_MIN_BLOCK_SIZE || |
| 694 | blocksize > NILFS_MAX_BLOCK_SIZE) { |
| 695 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " |
| 696 | "filesystem blocksize %d\n", blocksize); |
| 697 | err = -EINVAL; |
| 698 | goto failed_sbh; |
| 699 | } |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 700 | if (sb->s_blocksize != blocksize) { |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 701 | int hw_blocksize = bdev_logical_block_size(sb->s_bdev); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 702 | |
| 703 | if (blocksize < hw_blocksize) { |
| 704 | printk(KERN_ERR |
| 705 | "NILFS: blocksize %d too small for device " |
| 706 | "(sector-size = %d).\n", |
| 707 | blocksize, hw_blocksize); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 708 | err = -EINVAL; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 709 | goto failed_sbh; |
| 710 | } |
| 711 | nilfs_release_super_block(nilfs); |
| 712 | sb_set_blocksize(sb, blocksize); |
| 713 | |
| 714 | err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); |
| 715 | if (err) |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 716 | goto out; |
| 717 | /* not failed_sbh; sbh is released automatically |
| 718 | when reloading fails. */ |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 719 | } |
| 720 | nilfs->ns_blocksize_bits = sb->s_blocksize_bits; |
Ryusuke Konishi | 92c60cc | 2010-05-23 00:17:48 +0900 | [diff] [blame] | 721 | nilfs->ns_blocksize = blocksize; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 722 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 723 | err = nilfs_store_disk_layout(nilfs, sbp); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 724 | if (err) |
| 725 | goto failed_sbh; |
| 726 | |
| 727 | sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); |
| 728 | |
| 729 | nilfs->ns_mount_state = le16_to_cpu(sbp->s_state); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 730 | |
Jens Axboe | 2c96ce9 | 2009-09-15 09:43:56 +0200 | [diff] [blame] | 731 | bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 732 | nilfs->ns_bdi = bdi ? : &default_backing_dev_info; |
| 733 | |
Ryusuke Konishi | 843d63ba | 2010-06-28 19:15:24 +0900 | [diff] [blame] | 734 | err = nilfs_store_log_cursor(nilfs, sbp); |
| 735 | if (err) |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 736 | goto failed_sbh; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 737 | |
| 738 | /* Initialize gcinode cache */ |
| 739 | err = nilfs_init_gccache(nilfs); |
| 740 | if (err) |
| 741 | goto failed_sbh; |
| 742 | |
| 743 | set_nilfs_init(nilfs); |
| 744 | err = 0; |
| 745 | out: |
| 746 | up_write(&nilfs->ns_sem); |
| 747 | return err; |
| 748 | |
| 749 | failed_sbh: |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 750 | nilfs_release_super_block(nilfs); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 751 | goto out; |
| 752 | } |
| 753 | |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 754 | int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump, |
| 755 | size_t nsegs) |
| 756 | { |
| 757 | sector_t seg_start, seg_end; |
| 758 | sector_t start = 0, nblocks = 0; |
| 759 | unsigned int sects_per_block; |
| 760 | __u64 *sn; |
| 761 | int ret = 0; |
| 762 | |
| 763 | sects_per_block = (1 << nilfs->ns_blocksize_bits) / |
| 764 | bdev_logical_block_size(nilfs->ns_bdev); |
| 765 | for (sn = segnump; sn < segnump + nsegs; sn++) { |
| 766 | nilfs_get_segment_range(nilfs, *sn, &seg_start, &seg_end); |
| 767 | |
| 768 | if (!nblocks) { |
| 769 | start = seg_start; |
| 770 | nblocks = seg_end - seg_start + 1; |
| 771 | } else if (start + nblocks == seg_start) { |
| 772 | nblocks += seg_end - seg_start + 1; |
| 773 | } else { |
| 774 | ret = blkdev_issue_discard(nilfs->ns_bdev, |
| 775 | start * sects_per_block, |
| 776 | nblocks * sects_per_block, |
| 777 | GFP_NOFS, |
Stephen Rothwell | 6a47dc1 | 2010-04-29 09:32:00 +0200 | [diff] [blame] | 778 | BLKDEV_IFL_BARRIER); |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 779 | if (ret < 0) |
| 780 | return ret; |
| 781 | nblocks = 0; |
| 782 | } |
| 783 | } |
| 784 | if (nblocks) |
| 785 | ret = blkdev_issue_discard(nilfs->ns_bdev, |
| 786 | start * sects_per_block, |
| 787 | nblocks * sects_per_block, |
Stephen Rothwell | 6a47dc1 | 2010-04-29 09:32:00 +0200 | [diff] [blame] | 788 | GFP_NOFS, BLKDEV_IFL_BARRIER); |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 789 | return ret; |
| 790 | } |
| 791 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 792 | int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks) |
| 793 | { |
| 794 | struct inode *dat = nilfs_dat_inode(nilfs); |
| 795 | unsigned long ncleansegs; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 796 | |
| 797 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ |
Ryusuke Konishi | ef7d475 | 2009-11-13 08:45:32 +0900 | [diff] [blame] | 798 | ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 799 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ |
Ryusuke Konishi | ef7d475 | 2009-11-13 08:45:32 +0900 | [diff] [blame] | 800 | *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment; |
| 801 | return 0; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 802 | } |
| 803 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 804 | int nilfs_near_disk_full(struct the_nilfs *nilfs) |
| 805 | { |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 806 | unsigned long ncleansegs, nincsegs; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 807 | |
Ryusuke Konishi | ef7d475 | 2009-11-13 08:45:32 +0900 | [diff] [blame] | 808 | ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); |
| 809 | nincsegs = atomic_read(&nilfs->ns_ndirtyblks) / |
| 810 | nilfs->ns_blocks_per_segment + 1; |
| 811 | |
| 812 | return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs; |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 815 | /** |
| 816 | * nilfs_find_sbinfo - find existing nilfs_sb_info structure |
| 817 | * @nilfs: nilfs object |
| 818 | * @rw_mount: mount type (non-zero value for read/write mount) |
| 819 | * @cno: checkpoint number (zero for read-only mount) |
| 820 | * |
| 821 | * nilfs_find_sbinfo() returns the nilfs_sb_info structure which |
| 822 | * @rw_mount and @cno (in case of snapshots) matched. If no instance |
| 823 | * was found, NULL is returned. Although the super block instance can |
| 824 | * be unmounted after this function returns, the nilfs_sb_info struct |
| 825 | * is kept on memory until nilfs_put_sbinfo() is called. |
| 826 | */ |
| 827 | struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs, |
| 828 | int rw_mount, __u64 cno) |
| 829 | { |
| 830 | struct nilfs_sb_info *sbi; |
| 831 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 832 | down_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 833 | /* |
| 834 | * The SNAPSHOT flag and sb->s_flags are supposed to be |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 835 | * protected with nilfs->ns_super_sem. |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 836 | */ |
| 837 | sbi = nilfs->ns_current; |
| 838 | if (rw_mount) { |
| 839 | if (sbi && !(sbi->s_super->s_flags & MS_RDONLY)) |
| 840 | goto found; /* read/write mount */ |
| 841 | else |
| 842 | goto out; |
| 843 | } else if (cno == 0) { |
| 844 | if (sbi && (sbi->s_super->s_flags & MS_RDONLY)) |
| 845 | goto found; /* read-only mount */ |
| 846 | else |
| 847 | goto out; |
| 848 | } |
| 849 | |
| 850 | list_for_each_entry(sbi, &nilfs->ns_supers, s_list) { |
| 851 | if (nilfs_test_opt(sbi, SNAPSHOT) && |
| 852 | sbi->s_snapshot_cno == cno) |
| 853 | goto found; /* snapshot mount */ |
| 854 | } |
| 855 | out: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 856 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 857 | return NULL; |
| 858 | |
| 859 | found: |
| 860 | atomic_inc(&sbi->s_count); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 861 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 862 | return sbi; |
| 863 | } |
| 864 | |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 865 | int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno, |
| 866 | int snapshot_mount) |
| 867 | { |
| 868 | struct nilfs_sb_info *sbi; |
| 869 | int ret = 0; |
| 870 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 871 | down_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 872 | if (cno == 0 || cno > nilfs->ns_cno) |
| 873 | goto out_unlock; |
| 874 | |
| 875 | list_for_each_entry(sbi, &nilfs->ns_supers, s_list) { |
| 876 | if (sbi->s_snapshot_cno == cno && |
| 877 | (!snapshot_mount || nilfs_test_opt(sbi, SNAPSHOT))) { |
| 878 | /* exclude read-only mounts */ |
| 879 | ret++; |
| 880 | break; |
| 881 | } |
| 882 | } |
| 883 | /* for protecting recent checkpoints */ |
| 884 | if (cno >= nilfs_last_cno(nilfs)) |
| 885 | ret++; |
| 886 | |
| 887 | out_unlock: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 888 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 8a9d219 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 889 | return ret; |
| 890 | } |