Commit 7f8d12ea authored by Naohiro Aota's avatar Naohiro Aota Committed by David Sterba
Browse files

fs: add a lockdep check function for sb_start_write() 



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: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarNaohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent d8645462

include/linux/fs.h

+5 −0
Original line number Diff line number Diff line
@@ -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