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authorNaohiro Aota <naohiro.aota@wdc.com>2022-03-29 15:55:59 +0900
committerDavid Sterba <dsterba@suse.com>2022-05-16 17:03:10 +0200
commit7f8d12ea96352275c2850c24a1367166179392d2 (patch)
treea9b97f2d113cb47da1a0d276bfd8723fb942c26b /include
parentd864546231e051e33e200025e4a6988b996f2654 (diff)
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: 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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bbde95387a23..01d61984ce7a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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