Add a function sb_write_started() to return if sb_start_write() is
properly called. It is used in the next commit.
Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
---
include/linux/fs.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 27746a3da8fd..1f3df6e8a74d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1732,6 +1732,11 @@ 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
--
2.35.1
