diff options
Diffstat (limited to 'fs/btrfs/subpage.h')
| -rw-r--r-- | fs/btrfs/subpage.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/btrfs/subpage.h b/fs/btrfs/subpage.h index 7ba544bcc9c6..fe51cc237a66 100644 --- a/fs/btrfs/subpage.h +++ b/fs/btrfs/subpage.h @@ -19,7 +19,13 @@ struct btrfs_subpage { /* Common members for both data and metadata pages */ spinlock_t lock; union { - /* Structures only used by metadata */ + /* + * Structures only used by metadata + * + * @eb_refs should only be operated under private_lock, as it + * manages whether the subpage can be detached. + */ + atomic_t eb_refs; /* Structures only used by data */ }; }; @@ -40,4 +46,9 @@ int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, enum btrfs_subpage_type type); void btrfs_free_subpage(struct btrfs_subpage *subpage); +void btrfs_page_inc_eb_refs(const struct btrfs_fs_info *fs_info, + struct page *page); +void btrfs_page_dec_eb_refs(const struct btrfs_fs_info *fs_info, + struct page *page); + #endif |