Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/fs.h> |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 3 | #include <linux/blkdev.h> |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 4 | #include <linux/crypto.h> |
| 5 | #include <linux/scatterlist.h> |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 6 | #include <linux/swap.h> |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 7 | #include "ctree.h" |
| 8 | #include "disk-io.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 9 | #include "transaction.h" |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 10 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 11 | static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 12 | { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 13 | struct btrfs_node *node = btrfs_buffer_node(buf); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 14 | if (buf->b_blocknr != btrfs_header_blocknr(&node->header)) { |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 15 | BUG(); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 16 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 17 | if (root->node && btrfs_header_parentid(&node->header) != |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 18 | btrfs_header_parentid(btrfs_buffer_header(root->node))) { |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 19 | BUG(); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 20 | } |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 21 | return 0; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 22 | } |
| 23 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 24 | struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 25 | { |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 26 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
| 27 | int blockbits = root->fs_info->sb->s_blocksize_bits; |
| 28 | unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits); |
| 29 | struct page *page; |
| 30 | struct buffer_head *bh; |
| 31 | struct buffer_head *head; |
| 32 | struct buffer_head *ret = NULL; |
| 33 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 34 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 35 | page = find_lock_page(mapping, index); |
| 36 | if (!page) |
| 37 | return NULL; |
| 38 | |
| 39 | if (!page_has_buffers(page)) |
| 40 | goto out_unlock; |
| 41 | |
| 42 | head = page_buffers(page); |
| 43 | bh = head; |
| 44 | do { |
| 45 | if (buffer_mapped(bh) && bh->b_blocknr == blocknr) { |
| 46 | ret = bh; |
| 47 | get_bh(bh); |
| 48 | goto out_unlock; |
| 49 | } |
| 50 | bh = bh->b_this_page; |
| 51 | } while (bh != head); |
| 52 | out_unlock: |
| 53 | unlock_page(page); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 54 | if (ret) { |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 55 | touch_buffer(ret); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 56 | } |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 57 | page_cache_release(page); |
| 58 | return ret; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 59 | } |
| 60 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 61 | struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root, |
| 62 | u64 blocknr) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 63 | { |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 64 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
| 65 | int blockbits = root->fs_info->sb->s_blocksize_bits; |
| 66 | unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits); |
| 67 | struct page *page; |
| 68 | struct buffer_head *bh; |
| 69 | struct buffer_head *head; |
| 70 | struct buffer_head *ret = NULL; |
| 71 | u64 first_block = index << (PAGE_CACHE_SHIFT - blockbits); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 72 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 73 | page = grab_cache_page(mapping, index); |
| 74 | if (!page) |
| 75 | return NULL; |
| 76 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 77 | if (!page_has_buffers(page)) |
| 78 | create_empty_buffers(page, root->fs_info->sb->s_blocksize, 0); |
| 79 | head = page_buffers(page); |
| 80 | bh = head; |
| 81 | do { |
| 82 | if (!buffer_mapped(bh)) { |
| 83 | bh->b_bdev = root->fs_info->sb->s_bdev; |
| 84 | bh->b_blocknr = first_block; |
| 85 | set_buffer_mapped(bh); |
| 86 | } |
| 87 | if (bh->b_blocknr == blocknr) { |
| 88 | ret = bh; |
| 89 | get_bh(bh); |
| 90 | goto out_unlock; |
| 91 | } |
| 92 | bh = bh->b_this_page; |
| 93 | first_block++; |
| 94 | } while (bh != head); |
| 95 | out_unlock: |
| 96 | unlock_page(page); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 97 | if (ret) |
| 98 | touch_buffer(ret); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 99 | page_cache_release(page); |
| 100 | return ret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 101 | } |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 102 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 103 | static sector_t max_block(struct block_device *bdev) |
| 104 | { |
| 105 | sector_t retval = ~((sector_t)0); |
| 106 | loff_t sz = i_size_read(bdev->bd_inode); |
| 107 | |
| 108 | if (sz) { |
| 109 | unsigned int size = block_size(bdev); |
| 110 | unsigned int sizebits = blksize_bits(size); |
| 111 | retval = (sz >> sizebits); |
| 112 | } |
| 113 | return retval; |
| 114 | } |
| 115 | |
| 116 | static int btree_get_block(struct inode *inode, sector_t iblock, |
| 117 | struct buffer_head *bh, int create) |
| 118 | { |
| 119 | if (iblock >= max_block(inode->i_sb->s_bdev)) { |
| 120 | if (create) |
| 121 | return -EIO; |
| 122 | |
| 123 | /* |
| 124 | * for reads, we're just trying to fill a partial page. |
| 125 | * return a hole, they will have to call get_block again |
| 126 | * before they can fill it, and they will get -EIO at that |
| 127 | * time |
| 128 | */ |
| 129 | return 0; |
| 130 | } |
| 131 | bh->b_bdev = inode->i_sb->s_bdev; |
| 132 | bh->b_blocknr = iblock; |
| 133 | set_buffer_mapped(bh); |
| 134 | return 0; |
| 135 | } |
| 136 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 137 | int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len, |
| 138 | char *result) |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 139 | { |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 140 | struct scatterlist sg; |
| 141 | struct crypto_hash *tfm = root->fs_info->hash_tfm; |
| 142 | struct hash_desc desc; |
| 143 | int ret; |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 144 | |
| 145 | desc.tfm = tfm; |
| 146 | desc.flags = 0; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 147 | sg_init_one(&sg, data, len); |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 148 | spin_lock(&root->fs_info->hash_lock); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 149 | ret = crypto_hash_digest(&desc, &sg, 1, result); |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 150 | spin_unlock(&root->fs_info->hash_lock); |
| 151 | if (ret) { |
| 152 | printk("sha256 digest failed\n"); |
| 153 | } |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 154 | return ret; |
| 155 | } |
| 156 | static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh, |
| 157 | int verify) |
| 158 | { |
| 159 | char result[BTRFS_CSUM_SIZE]; |
| 160 | int ret; |
| 161 | struct btrfs_node *node; |
| 162 | |
| 163 | ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE, |
| 164 | bh->b_size - BTRFS_CSUM_SIZE, result); |
| 165 | if (ret) |
| 166 | return ret; |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 167 | if (verify) { |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 168 | if (memcmp(bh->b_data, result, BTRFS_CSUM_SIZE)) { |
| 169 | printk("checksum verify failed on %lu\n", |
| 170 | bh->b_blocknr); |
| 171 | return 1; |
| 172 | } |
| 173 | } else { |
| 174 | node = btrfs_buffer_node(bh); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 175 | memcpy(node->header.csum, result, BTRFS_CSUM_SIZE); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 176 | } |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 177 | return 0; |
| 178 | } |
| 179 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 180 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
| 181 | { |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 182 | struct buffer_head *bh; |
| 183 | struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb); |
| 184 | struct buffer_head *head; |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 185 | if (!page_has_buffers(page)) { |
| 186 | create_empty_buffers(page, root->fs_info->sb->s_blocksize, |
| 187 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
| 188 | } |
| 189 | head = page_buffers(page); |
| 190 | bh = head; |
| 191 | do { |
| 192 | if (buffer_dirty(bh)) |
| 193 | csum_tree_block(root, bh, 0); |
| 194 | bh = bh->b_this_page; |
| 195 | } while (bh != head); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 196 | return block_write_full_page(page, btree_get_block, wbc); |
| 197 | } |
| 198 | |
| 199 | static int btree_readpage(struct file * file, struct page * page) |
| 200 | { |
| 201 | return block_read_full_page(page, btree_get_block); |
| 202 | } |
| 203 | |
| 204 | static struct address_space_operations btree_aops = { |
| 205 | .readpage = btree_readpage, |
| 206 | .writepage = btree_writepage, |
| 207 | .sync_page = block_sync_page, |
| 208 | }; |
| 209 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 210 | struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) |
| 211 | { |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 212 | struct buffer_head *bh = NULL; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 213 | |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 214 | bh = btrfs_find_create_tree_block(root, blocknr); |
| 215 | if (!bh) |
| 216 | return bh; |
Chris Mason | 9d64272 | 2007-04-03 11:43:19 -0400 | [diff] [blame] | 217 | if (buffer_uptodate(bh)) |
| 218 | goto uptodate; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 219 | lock_buffer(bh); |
| 220 | if (!buffer_uptodate(bh)) { |
| 221 | get_bh(bh); |
| 222 | bh->b_end_io = end_buffer_read_sync; |
| 223 | submit_bh(READ, bh); |
| 224 | wait_on_buffer(bh); |
| 225 | if (!buffer_uptodate(bh)) |
| 226 | goto fail; |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 227 | csum_tree_block(root, bh, 1); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 228 | } else { |
| 229 | unlock_buffer(bh); |
| 230 | } |
Chris Mason | 9d64272 | 2007-04-03 11:43:19 -0400 | [diff] [blame] | 231 | uptodate: |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 232 | if (check_tree_block(root, bh)) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 233 | BUG(); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 234 | return bh; |
| 235 | fail: |
| 236 | brelse(bh); |
| 237 | return NULL; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 238 | } |
| 239 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 240 | int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 241 | struct buffer_head *buf) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 242 | { |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 243 | WARN_ON(atomic_read(&buf->b_count) == 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 244 | mark_buffer_dirty(buf); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 248 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 249 | struct buffer_head *buf) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 250 | { |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 251 | WARN_ON(atomic_read(&buf->b_count) == 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 252 | clear_buffer_dirty(buf); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 256 | static int __setup_root(int blocksize, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 257 | struct btrfs_root *root, |
| 258 | struct btrfs_fs_info *fs_info, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 259 | u64 objectid) |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 260 | { |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 261 | root->node = NULL; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 262 | root->commit_root = NULL; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 263 | root->blocksize = blocksize; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 264 | root->ref_cows = 0; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 265 | root->fs_info = fs_info; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 266 | memset(&root->root_key, 0, sizeof(root->root_key)); |
| 267 | memset(&root->root_item, 0, sizeof(root->root_item)); |
| 268 | return 0; |
| 269 | } |
| 270 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 271 | static int find_and_setup_root(int blocksize, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 272 | struct btrfs_root *tree_root, |
| 273 | struct btrfs_fs_info *fs_info, |
| 274 | u64 objectid, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 275 | struct btrfs_root *root) |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 276 | { |
| 277 | int ret; |
| 278 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 279 | __setup_root(blocksize, root, fs_info, objectid); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 280 | ret = btrfs_find_last_root(tree_root, objectid, |
| 281 | &root->root_item, &root->root_key); |
| 282 | BUG_ON(ret); |
| 283 | |
| 284 | root->node = read_tree_block(root, |
| 285 | btrfs_root_blocknr(&root->root_item)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 286 | BUG_ON(!root->node); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 287 | return 0; |
| 288 | } |
| 289 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 290 | struct btrfs_root *open_ctree(struct super_block *sb) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 291 | { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 292 | struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root), |
| 293 | GFP_NOFS); |
| 294 | struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), |
| 295 | GFP_NOFS); |
| 296 | struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), |
| 297 | GFP_NOFS); |
| 298 | struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root), |
| 299 | GFP_NOFS); |
| 300 | struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info), |
| 301 | GFP_NOFS); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 302 | int ret; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 303 | struct btrfs_super_block *disk_super; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 304 | |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 305 | init_bit_radix(&fs_info->pinned_radix); |
| 306 | init_bit_radix(&fs_info->pending_del_radix); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 307 | sb_set_blocksize(sb, 4096); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 308 | fs_info->running_transaction = NULL; |
| 309 | fs_info->fs_root = root; |
| 310 | fs_info->tree_root = tree_root; |
| 311 | fs_info->extent_root = extent_root; |
| 312 | fs_info->inode_root = inode_root; |
| 313 | fs_info->last_inode_alloc = 0; |
Chris Mason | 5be6f7f | 2007-04-05 13:35:25 -0400 | [diff] [blame] | 314 | fs_info->highest_inode = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 315 | fs_info->sb = sb; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 316 | fs_info->btree_inode = new_inode(sb); |
| 317 | fs_info->btree_inode->i_ino = 1; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 318 | fs_info->btree_inode->i_nlink = 1; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 319 | fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size; |
| 320 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 321 | insert_inode_hash(fs_info->btree_inode); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 322 | mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 323 | fs_info->hash_tfm = crypto_alloc_hash("sha256", 0, CRYPTO_ALG_ASYNC); |
Chris Mason | 30ae846 | 2007-03-29 09:59:15 -0400 | [diff] [blame] | 324 | spin_lock_init(&fs_info->hash_lock); |
Chris Mason | 30ae846 | 2007-03-29 09:59:15 -0400 | [diff] [blame] | 325 | if (!fs_info->hash_tfm || IS_ERR(fs_info->hash_tfm)) { |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 326 | printk("failed to allocate sha256 hash\n"); |
| 327 | return NULL; |
| 328 | } |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 329 | mutex_init(&fs_info->trans_mutex); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 330 | mutex_init(&fs_info->fs_mutex); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 331 | memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert)); |
| 332 | memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 333 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 334 | __setup_root(sb->s_blocksize, tree_root, |
| 335 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
| 336 | fs_info->sb_buffer = read_tree_block(tree_root, |
| 337 | BTRFS_SUPER_INFO_OFFSET / |
| 338 | sb->s_blocksize); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 339 | |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 340 | if (!fs_info->sb_buffer) { |
| 341 | printk("failed2\n"); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 342 | return NULL; |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 343 | } |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 344 | disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 345 | if (!btrfs_super_root(disk_super)) { |
| 346 | return NULL; |
| 347 | } |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 348 | fs_info->disk_super = disk_super; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 349 | tree_root->node = read_tree_block(tree_root, |
| 350 | btrfs_super_root(disk_super)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 351 | BUG_ON(!tree_root->node); |
| 352 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 353 | mutex_lock(&fs_info->fs_mutex); |
| 354 | ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 355 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 356 | BUG_ON(ret); |
| 357 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 358 | ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 359 | BTRFS_INODE_MAP_OBJECTID, inode_root); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 360 | BUG_ON(ret); |
| 361 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 362 | ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 363 | BTRFS_FS_TREE_OBJECTID, root); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 364 | BUG_ON(ret); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 365 | root->commit_root = root->node; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 366 | get_bh(root->node); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 367 | root->ref_cows = 1; |
Chris Mason | 293ffd5 | 2007-03-20 15:57:25 -0400 | [diff] [blame] | 368 | root->fs_info->generation = root->root_key.offset + 1; |
Chris Mason | 5be6f7f | 2007-04-05 13:35:25 -0400 | [diff] [blame] | 369 | ret = btrfs_find_highest_inode(root, &root->fs_info->last_inode_alloc); |
| 370 | if (ret == 0) |
| 371 | fs_info->highest_inode = fs_info->last_inode_alloc; |
| 372 | mutex_unlock(&fs_info->fs_mutex); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 373 | return root; |
| 374 | } |
| 375 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 376 | int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 377 | *root) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 378 | { |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 379 | struct buffer_head *bh = root->fs_info->sb_buffer; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 380 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 381 | btrfs_set_super_root(root->fs_info->disk_super, |
| 382 | root->fs_info->tree_root->node->b_blocknr); |
| 383 | lock_buffer(bh); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 384 | WARN_ON(atomic_read(&bh->b_count) < 1); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 385 | clear_buffer_dirty(bh); |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 386 | csum_tree_block(root, bh, 0); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 387 | bh->b_end_io = end_buffer_write_sync; |
| 388 | get_bh(bh); |
| 389 | submit_bh(WRITE, bh); |
| 390 | wait_on_buffer(bh); |
| 391 | if (!buffer_uptodate(bh)) { |
| 392 | WARN_ON(1); |
| 393 | return -EIO; |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 394 | } |
| 395 | return 0; |
| 396 | } |
| 397 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 398 | int close_ctree(struct btrfs_root *root) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 399 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 400 | int ret; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 401 | struct btrfs_trans_handle *trans; |
| 402 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 403 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 404 | trans = btrfs_start_transaction(root, 1); |
| 405 | btrfs_commit_transaction(trans, root); |
| 406 | /* run commit again to drop the original snapshot */ |
| 407 | trans = btrfs_start_transaction(root, 1); |
| 408 | btrfs_commit_transaction(trans, root); |
| 409 | ret = btrfs_write_and_wait_transaction(NULL, root); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 410 | BUG_ON(ret); |
Chris Mason | 79154b1 | 2007-03-22 15:59:16 -0400 | [diff] [blame] | 411 | write_ctree_super(NULL, root); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 412 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 413 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 414 | if (root->node) |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 415 | btrfs_block_release(root, root->node); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 416 | if (root->fs_info->extent_root->node) |
| 417 | btrfs_block_release(root->fs_info->extent_root, |
| 418 | root->fs_info->extent_root->node); |
| 419 | if (root->fs_info->inode_root->node) |
| 420 | btrfs_block_release(root->fs_info->inode_root, |
| 421 | root->fs_info->inode_root->node); |
| 422 | if (root->fs_info->tree_root->node) |
| 423 | btrfs_block_release(root->fs_info->tree_root, |
| 424 | root->fs_info->tree_root->node); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 425 | btrfs_block_release(root, root->commit_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 426 | btrfs_block_release(root, root->fs_info->sb_buffer); |
Chris Mason | 87cbda5 | 2007-03-28 19:44:27 -0400 | [diff] [blame] | 427 | crypto_free_hash(root->fs_info->hash_tfm); |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 428 | truncate_inode_pages(root->fs_info->btree_inode->i_mapping, 0); |
| 429 | iput(root->fs_info->btree_inode); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 430 | kfree(root->fs_info->extent_root); |
| 431 | kfree(root->fs_info->inode_root); |
| 432 | kfree(root->fs_info->tree_root); |
| 433 | kfree(root->fs_info); |
| 434 | kfree(root); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 435 | return 0; |
| 436 | } |
| 437 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 438 | void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 439 | { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 440 | brelse(buf); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 441 | } |
| 442 | |