diff options
Diffstat (limited to 'fs/btrfs/space-info.h')
| -rw-r--r-- | fs/btrfs/space-info.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/btrfs/space-info.h b/fs/btrfs/space-info.h index fcec5286e0cb..702e431580c6 100644 --- a/fs/btrfs/space-info.h +++ b/fs/btrfs/space-info.h @@ -75,6 +75,29 @@ static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); } +/* + * + * Declare a helper function to detect underflow of various space info members + */ +#define DECLARE_SPACE_INFO_UPDATE(name) \ +static inline void \ +btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ + struct btrfs_space_info *sinfo, \ + s64 bytes) \ +{ \ + lockdep_assert_held(&sinfo->lock); \ + trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ + if (bytes < 0 && sinfo->name < -bytes) { \ + WARN_ON(1); \ + sinfo->name = 0; \ + return; \ + } \ + sinfo->name += bytes; \ +} + +DECLARE_SPACE_INFO_UPDATE(bytes_may_use); +DECLARE_SPACE_INFO_UPDATE(bytes_pinned); + void btrfs_space_info_add_new_bytes(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, u64 num_bytes); |