ext4: recheck buffer uptodate bit under buffer lock

Commit 7cb159d71ace ("ext4: remove an unnecessary if statement in
__ext4_get_inode_loc()") forget to recheck buffer's uptodate bit again
under buffer lock, which may overwrite the buffer if someone else have
already brought it uptodate and changed it.

Fixes: 7cb159d71ace ("ext4: remove an unnecessary if statement in __ext4_get_inode_loc()")
Cc: stable@kernel.org
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20210910080316.70421-1-yi.zhang@huawei.com

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9df1ab070fa541dcb4b3947eb6bac0de8580cf4b..b7c561ad38dd85d9333d015f0f8a11350aa341d9 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4277,6 +4277,12 @@ static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino,
                goto has_buffer;
 
        lock_buffer(bh);
+       if (ext4_buffer_uptodate(bh)) {
+               /* Someone brought it uptodate while we waited */
+               unlock_buffer(bh);
+               goto has_buffer;
+       }
+
        /*
         * If we have all information of the inode in memory and this
         * is the only valid inode in the block, we need not read the