btrfs: open code trivial helper btrfs_header_fsid
The helper btrfs_header_fsid follows naming convention of other struct
accessors but does something compeletly different. As the offsetof
calculation is clear in the context of extent buffer operations we can
remove it.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 06819c4..2e482657 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -541,7 +541,8 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
return -EUCLEAN;
ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
- btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
+ offsetof(struct btrfs_header, fsid),
+ BTRFS_FSID_SIZE) == 0);
if (csum_tree_block(eb, result))
return -EINVAL;
@@ -571,7 +572,8 @@ static int check_tree_block_fsid(struct extent_buffer *eb)
u8 fsid[BTRFS_FSID_SIZE];
int ret = 1;
- read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
+ read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
+ BTRFS_FSID_SIZE);
while (fs_devices) {
u8 *metadata_uuid;
