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fs: add a lockdep check function for sb_start_write()

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Add a function sb_write_started() to allow callers to verify if
sb_start_write() is properly called. It will be used for assertion in
btrfs.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2022-03-29 15:55:59 +09:00 • committed by David Sterba
parent d864546231
commit 7f8d12ea96
1 changed files with 5 additions and 0 deletions
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5
include/linux/fs.h
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@ -1708,6 +1708,11 @@ 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_)
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);
}
/**
* sb_end_write - drop write access to a superblock
* @sb: the super we wrote to