ext4: recheck buffer uptodate bit under buffer lock

Commit 8e33fad ("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: 8e33fad ("ext4: remove an unnecessary if statement in __ext4_get_inode_loc()")
Cc: [email protected]
Signed-off-by: Zhang Yi <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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