diff options
| -rw-r--r-- | fs/btrfs/inode.c | 51 |
1 files changed, 39 insertions, 12 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 55ed2c4829a8..844bb896f5ac 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -998,15 +998,24 @@ static noinline int cow_file_range(struct inode *inode, BTRFS_DATA_RELOC_TREE_OBJECTID) { ret = btrfs_reloc_clone_csums(inode, start, cur_alloc_size); + /* + * Only drop cache here, and process as normal. + * + * We must not allow extent_clear_unlock_delalloc() + * at out_unlock label to free meta of this ordered + * extent, as its meta should be freed by + * btrfs_finish_ordered_io(). + * + * So we must continue until @start is increased to + * skip current ordered extent. + */ if (ret) - goto out_drop_extent_cache; + btrfs_drop_extent_cache(BTRFS_I(inode), start, + start + ram_size - 1, 0); } btrfs_dec_block_group_reservations(fs_info, ins.objectid); - if (disk_num_bytes < cur_alloc_size) - break; - /* we're not doing compressed IO, don't unlock the first * page (which the caller expects to stay locked), don't * clear any dirty bits and don't set any writeback bits @@ -1022,10 +1031,21 @@ static noinline int cow_file_range(struct inode *inode, delalloc_end, locked_page, EXTENT_LOCKED | EXTENT_DELALLOC, op); - disk_num_bytes -= cur_alloc_size; + if (disk_num_bytes < cur_alloc_size) + disk_num_bytes = 0; + else + disk_num_bytes -= cur_alloc_size; num_bytes -= cur_alloc_size; alloc_hint = ins.objectid + ins.offset; start += cur_alloc_size; + + /* + * btrfs_reloc_clone_csums() error, since start is increased + * extent_clear_unlock_delalloc() at out_unlock label won't + * free metadata of current ordered extent, we're OK to exit. + */ + if (ret) + goto out_unlock; } out: return ret; @@ -1414,15 +1434,14 @@ out_check: BUG_ON(ret); /* -ENOMEM */ if (root->root_key.objectid == - BTRFS_DATA_RELOC_TREE_OBJECTID) { + BTRFS_DATA_RELOC_TREE_OBJECTID) + /* + * Error handled later, as we must prevent + * extent_clear_unlock_delalloc() in error handler + * from freeing metadata of created ordered extent. + */ ret = btrfs_reloc_clone_csums(inode, cur_offset, num_bytes); - if (ret) { - if (!nolock && nocow) - btrfs_end_write_no_snapshoting(root); - goto error; - } - } extent_clear_unlock_delalloc(inode, cur_offset, cur_offset + num_bytes - 1, end, @@ -1434,6 +1453,14 @@ out_check: if (!nolock && nocow) btrfs_end_write_no_snapshoting(root); cur_offset = extent_end; + + /* + * btrfs_reloc_clone_csums() error, now we're OK to call error + * handler, as metadata for created ordered extent will only + * be freed by btrfs_finish_ordered_io(). + */ + if (ret) + goto error; if (cur_offset > end) break; } |