f2fs: check s_dirty under cp_mutex
It needs to check s_dirty under cp_mutex, since s_dirty is reset under that
mutex.
And previous condition was not correct, since we can omit doing checkpoint
when checkpoint was done followed by all the node pages were written back.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 6f38aad..dc29b78 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -952,6 +952,10 @@
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "start block_ops");
mutex_lock(&sbi->cp_mutex);
+
+ if (!sbi->s_dirty)
+ goto out;
+
block_operations(sbi);
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish block_ops");
@@ -976,9 +980,9 @@
do_checkpoint(sbi, is_umount);
unblock_operations(sbi);
- mutex_unlock(&sbi->cp_mutex);
-
stat_inc_cp_count(sbi->stat_info);
+out:
+ mutex_unlock(&sbi->cp_mutex);
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish checkpoint");
}