Commit 8802e580 authored by Amir Goldstein's avatar Amir Goldstein Committed by Christian Brauner
Browse files

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: default avatarAmir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231122122715.2561213-15-amir73il@gmail.com


Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 6ae65439

include/linux/fs.h

+15 −1
Original line number Diff line number Diff line
@@ -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);

}



/**