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fs: create __sb_write_started() helper

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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>
This commit is contained in:
Amir Goldstein 2023-11-22 14:27:13 +02:00 committed by Christian Brauner
parent 6ae654392b
commit 8802e580ee
1 changed files with 15 additions and 1 deletions
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16
include/linux/fs.h
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@ -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);
}
/**