diff options
Diffstat (limited to 'fs/btrfs/fs.h')
| -rw-r--r-- | fs/btrfs/fs.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/fs.h b/fs/btrfs/fs.h index 2bd9bedc7095..d04b729cbdf3 100644 --- a/fs/btrfs/fs.h +++ b/fs/btrfs/fs.h @@ -416,6 +416,12 @@ struct btrfs_fs_info { struct btrfs_block_rsv empty_block_rsv; + /* + * Updated while holding the lock 'trans_lock'. Due to the life cycle of + * a transaction, it can be directly read while holding a transaction + * handle, everywhere else must be read with btrfs_get_fs_generation(). + * Should always be updated using btrfs_set_fs_generation(). + */ u64 generation; u64 last_trans_committed; /* @@ -817,6 +823,16 @@ struct btrfs_fs_info { #endif }; +static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info) +{ + return READ_ONCE(fs_info->generation); +} + +static inline void btrfs_set_fs_generation(struct btrfs_fs_info *fs_info, u64 gen) +{ + WRITE_ONCE(fs_info->generation, gen); +} + static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info, u64 gen) { |