[PATCH] f2fs: use lock_buffer when changing superblock

[Jaegeuk Kim]

When modifying sb contents, we need to use lock its buffer.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a018ed3..294e715 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1591,14 +1591,18 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
 		return err;
 
 	/* update superblock with uuid */
+	lock_buffer(sbi->raw_super_buf);
 	generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
+	unlock_buffer(sbi->raw_super_buf);
 
 	err = f2fs_commit_super(sbi, false);
 
 	mnt_drop_write_file(filp);
 	if (err) {
 		/* undo new data */
+		lock_buffer(sbi->raw_super_buf);
 		memset(sbi->raw_super->encrypt_pw_salt, 0, 16);
+		unlock_buffer(sbi->raw_super_buf);
 		return err;
 	}
 got_it:
-- 
2.4.9 (Apple Git-60)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/