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| author | Amir Goldstein <amir73il@gmail.com> | 2023-11-22 14:27:13 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-11-24 10:39:13 +0100 |
| commit | 8802e580ee643e3f63c6b39ff64e7c7baa4a55ba (patch) | |
| tree | 14e53613c2ced25b7be76deb980298adb1517408 | |
| parent | 6ae654392bb516a0baa47fed1f085d84e8cad739 (diff) | |
| download | lwn-8802e580ee643e3f63c6b39ff64e7c7baa4a55ba.tar.gz lwn-8802e580ee643e3f63c6b39ff64e7c7baa4a55ba.zip | |
fs: create __sb_write_started() helper
Similar to sb_write_started() for use by other sb freeze levels.
Unlike the boolean sb_write_started(), this helper returns a tristate
to distiguish the cases of lockdep disabled or unknown lock state.
This is needed for fanotify "pre content" events.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231122122715.2561213-15-amir73il@gmail.com
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | include/linux/fs.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 98b7a7a8c42e..ac8b5a9b467b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1645,9 +1645,23 @@ static inline bool __sb_start_write_trylock(struct super_block *sb, int level) #define __sb_writers_release(sb, lev) \ percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_) +/** + * __sb_write_started - check if sb freeze level is held + * @sb: the super we write to + * @level: the freeze level + * + * > 0 sb freeze level is held + * 0 sb freeze level is not held + * < 0 !CONFIG_LOCKDEP/LOCK_STATE_UNKNOWN + */ +static inline int __sb_write_started(const struct super_block *sb, int level) +{ + return lockdep_is_held_type(sb->s_writers.rw_sem + level - 1, 1); +} + static inline bool sb_write_started(const struct super_block *sb) { - return lockdep_is_held_type(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1, 1); + return __sb_write_started(sb, SB_FREEZE_WRITE); } /** |