diff options
Diffstat (limited to 'fs/btrfs/file-item.c')
| -rw-r--r-- | fs/btrfs/file-item.c | 66 |
1 files changed, 47 insertions, 19 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index ff8f3339c68..8cc3c1d1541 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -4,7 +4,7 @@ #include "transaction.h" #define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \ - sizeof(struct btrfs_item)) / \ + sizeof(struct btrfs_item) * 2) / \ sizeof(struct btrfs_csum_item)) - 1)) int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, @@ -19,11 +19,6 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); BUG_ON(!path); btrfs_init_path(path); - /* - ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block, - (u64)-1, &ins); - */ - BUG_ON(ret); file_key.objectid = objectid; file_key.offset = pos; file_key.flags = 0; @@ -40,6 +35,7 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, btrfs_set_file_extent_num_blocks(item, num_blocks); btrfs_set_file_extent_generation(item, trans->transid); btrfs_mark_buffer_dirty(path->nodes[0]); + btrfs_release_path(root, path); btrfs_free_path(path); return 0; @@ -57,6 +53,7 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, struct btrfs_csum_item *item; struct btrfs_leaf *leaf; u64 csum_offset = 0; + int csums_in_item; file_key.objectid = objectid; file_key.offset = offset; @@ -79,9 +76,11 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, } csum_offset = (offset - found_key.offset) >> root->fs_info->sb->s_blocksize_bits; - if (csum_offset >= - btrfs_item_size(leaf->items + path->slots[0]) / - sizeof(struct btrfs_csum_item)) { + csums_in_item = btrfs_item_size(leaf->items + path->slots[0]); + csums_in_item /= sizeof(struct btrfs_csum_item); + + if (csum_offset >= csums_in_item) { + ret = -EFBIG; goto fail; } } @@ -128,16 +127,36 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); BUG_ON(!path); - btrfs_init_path(path); - item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0); - if (!IS_ERR(item)) - goto found; - btrfs_release_path(root, path); file_key.objectid = objectid; file_key.offset = offset; file_key.flags = 0; btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); + + item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1); + if (!IS_ERR(item)) + goto found; + ret = PTR_ERR(item); + if (ret == -EFBIG) { + u32 item_size; + /* we found one, but it isn't big enough yet */ + leaf = btrfs_buffer_leaf(path->nodes[0]); + item_size = btrfs_item_size(leaf->items + path->slots[0]); + if ((item_size / sizeof(struct btrfs_csum_item)) >= + MAX_CSUM_ITEMS(root)) { + /* already at max size, make a new one */ + goto insert; + } + } else { + /* we didn't find a csum item, insert one */ + goto insert; + } + + /* + * at this point, we know the tree has an item, but it isn't big + * enough yet to put our csum in. Grow it + */ + btrfs_release_path(root, path); ret = btrfs_search_slot(trans, root, &file_key, path, sizeof(struct btrfs_csum_item), 1); if (ret < 0) @@ -146,7 +165,6 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, BUG(); } if (path->slots[0] == 0) { - btrfs_release_path(root, path); goto insert; } path->slots[0]--; @@ -157,29 +175,36 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || found_key.objectid != objectid || csum_offset >= MAX_CSUM_ITEMS(root)) { - btrfs_release_path(root, path); + WARN_ON(1); goto insert; } if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) / sizeof(struct btrfs_csum_item)) { - ret = btrfs_extend_item(trans, root, path, - sizeof(struct btrfs_csum_item)); + u32 diff = (csum_offset + 1) * sizeof(struct btrfs_csum_item); + diff = diff - btrfs_item_size(leaf->items + path->slots[0]); + WARN_ON(diff != sizeof(struct btrfs_csum_item)); + ret = btrfs_extend_item(trans, root, path, diff); BUG_ON(ret); goto csum; } insert: + btrfs_release_path(root, path); csum_offset = 0; ret = btrfs_insert_empty_item(trans, root, path, &file_key, sizeof(struct btrfs_csum_item)); - if (ret != 0 && ret != -EEXIST) + if (ret != 0) { + printk("at insert for %Lu %u %Lu ret is %d\n", file_key.objectid, file_key.flags, file_key.offset, ret); + WARN_ON(1); goto fail; + } csum: item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], struct btrfs_csum_item); ret = 0; item += csum_offset; found: + btrfs_check_bounds(item->csum, BTRFS_CSUM_SIZE, path->nodes[0]->b_data, root->fs_info->sb->s_blocksize); ret = btrfs_csum_data(root, data, len, item->csum); btrfs_mark_buffer_dirty(path->nodes[0]); fail: @@ -210,6 +235,9 @@ int btrfs_csum_verify_file_block(struct btrfs_root *root, item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0); if (IS_ERR(item)) { ret = PTR_ERR(item); + /* a csum that isn't present is a preallocated region. */ + if (ret == -ENOENT || ret == -EFBIG) + ret = 1; goto fail; } |