Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 fix from Ted Ts'o:
 "Fix an ext4 regression which breaks remounting r/w file systems that
  have the quota feature enabled"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: only check dquot_initialize_needed() when debugging
  Revert "ext4: don't clear SB_RDONLY when remounting r/w until quota is re-enabled"

Author: torvalds

fs/ext4/super.c

@@ -6388,7 +6388,6 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
 	struct ext4_mount_options old_opts;
 	ext4_group_t g;
 	int err = 0;
-	int enable_rw = 0;
 #ifdef CONFIG_QUOTA
 	int enable_quota = 0;
 	int i, j;
@@ -6575,7 +6574,7 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
 			if (err)
 				goto restore_opts;
 
-			enable_rw = 1;
+			sb->s_flags &= ~SB_RDONLY;
 			if (ext4_has_feature_mmp(sb)) {
 				err = ext4_multi_mount_protect(sb,
 						le64_to_cpu(es->s_mmp_block));
@@ -6622,9 +6621,6 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
 	if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
 		ext4_release_system_zone(sb);
 
-	if (enable_rw)
-		sb->s_flags &= ~SB_RDONLY;
-
 	/*
 	 * Reinitialize lazy itable initialization thread based on
 	 * current settings

fs/ext4/xattr.c

@@ -2056,8 +2056,9 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
 			else {
 				u32 ref;
 
+#ifdef EXT4_XATTR_DEBUG
 				WARN_ON_ONCE(dquot_initialize_needed(inode));
-
+#endif
 				/* The old block is released after updating
 				   the inode. */
 				error = dquot_alloc_block(inode,
@@ -2120,8 +2121,9 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
 			/* We need to allocate a new block */
 			ext4_fsblk_t goal, block;
 
+#ifdef EXT4_XATTR_DEBUG
 			WARN_ON_ONCE(dquot_initialize_needed(inode));
-
+#endif
 			goal = ext4_group_first_block_no(sb,
 						EXT4_I(inode)->i_block_group);
 			block = ext4_new_meta_blocks(handle, inode, goal, 0,