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

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
......@@ -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
......
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