diff options
Diffstat (limited to 'fs/btrfs/subpage.h')
| -rw-r--r-- | fs/btrfs/subpage.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/subpage.h b/fs/btrfs/subpage.h index 291cb1932f27..9d087ab3244e 100644 --- a/fs/btrfs/subpage.h +++ b/fs/btrfs/subpage.h @@ -33,6 +33,7 @@ struct btrfs_subpage { /* Structures only used by data */ struct { atomic_t readers; + atomic_t writers; }; }; }; @@ -63,6 +64,15 @@ void btrfs_subpage_start_reader(const struct btrfs_fs_info *fs_info, void btrfs_subpage_end_reader(const struct btrfs_fs_info *fs_info, struct page *page, u64 start, u32 len); +void btrfs_subpage_start_writer(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len); +bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len); +int btrfs_page_start_writer_lock(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len); +void btrfs_page_end_writer_lock(const struct btrfs_fs_info *fs_info, + struct page *page, u64 start, u32 len); + /* * Template for subpage related operations. * |