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 676280bc7562..7ba544bcc9c6 100644 --- a/fs/btrfs/subpage.h +++ b/fs/btrfs/subpage.h @@ -18,6 +18,10 @@ struct btrfs_subpage { /* Common members for both data and metadata pages */ spinlock_t lock; + union { + /* Structures only used by metadata */ + /* Structures only used by data */ + }; }; enum btrfs_subpage_type { @@ -30,4 +34,10 @@ int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info, struct page *page); +/* Allocate additional data where page represents more than one sector */ +int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, + struct btrfs_subpage **ret, + enum btrfs_subpage_type type); +void btrfs_free_subpage(struct btrfs_subpage *subpage); + #endif |