diff options
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 39 |
1 files changed, 18 insertions, 21 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index a496219baa39..84799ef76758 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -545,33 +545,30 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page) static int check_tree_block_fsid(struct extent_buffer *eb) { struct btrfs_fs_info *fs_info = eb->fs_info; - struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs; u8 fsid[BTRFS_FSID_SIZE]; - int ret = 1; + u8 *metadata_uuid; read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid), BTRFS_FSID_SIZE); - while (fs_devices) { - u8 *metadata_uuid; + /* + * Checking the incompat flag is only valid for the current fs. For + * seed devices it's forbidden to have their uuid changed so reading + * ->fsid in this case is fine + */ + if (btrfs_fs_incompat(fs_info, METADATA_UUID)) + metadata_uuid = fs_devices->metadata_uuid; + else + metadata_uuid = fs_devices->fsid; - /* - * Checking the incompat flag is only valid for the current - * fs. For seed devices it's forbidden to have their uuid - * changed so reading ->fsid in this case is fine - */ - if (fs_devices == fs_info->fs_devices && - btrfs_fs_incompat(fs_info, METADATA_UUID)) - metadata_uuid = fs_devices->metadata_uuid; - else - metadata_uuid = fs_devices->fsid; + if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) + return 0; - if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE)) { - ret = 0; - break; - } - fs_devices = fs_devices->seed; - } - return ret; + list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list) + if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE)) + return 0; + + return 1; } static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, |