linux-kernel - [PATCH 117/241] reiserfs: Fix lock ordering during remount

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Message-Id: <1355407206-17100-118-git-send-email-herton.krzesinski@canonical.com>
Date:	Thu, 13 Dec 2012 11:58:02 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Jan Kara <jack@...e.cz>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 117/241] reiserfs: Fix lock ordering during remount

3.5.7.2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@...e.cz>

commit 3bb3e1fc47aca554e7e2cc4deeddc24750987ac2 upstream.

When remounting reiserfs dquot_suspend() or dquot_resume() can be called.
These functions take dqonoff_mutex which ranks above write lock so we have
to drop it before calling into quota code.

Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 fs/reiserfs/super.c |   27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 651ce76..2ad0789 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1325,7 +1325,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 				kfree(qf_names[i]);
 #endif
 		err = -EINVAL;
-		goto out_err;
+		goto out_unlock;
 	}
 #ifdef CONFIG_QUOTA
 	handle_quota_files(s, qf_names, &qfmt);
@@ -1369,7 +1369,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	if (blocks) {
 		err = reiserfs_resize(s, blocks);
 		if (err != 0)
-			goto out_err;
+			goto out_unlock;
 	}
 
 	if (*mount_flags & MS_RDONLY) {
@@ -1379,9 +1379,15 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 			/* it is read-only already */
 			goto out_ok;
 
+		/*
+		 * Drop write lock. Quota will retake it when needed and lock
+		 * ordering requires calling dquot_suspend() without it.
+		 */
+		reiserfs_write_unlock(s);
 		err = dquot_suspend(s, -1);
 		if (err < 0)
 			goto out_err;
+		reiserfs_write_lock(s);
 
 		/* try to remount file system with read-only permissions */
 		if (sb_umount_state(rs) == REISERFS_VALID_FS
@@ -1391,7 +1397,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 
 		err = journal_begin(&th, s, 10);
 		if (err)
-			goto out_err;
+			goto out_unlock;
 
 		/* Mounting a rw partition read-only. */
 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
@@ -1406,7 +1412,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 
 		if (reiserfs_is_journal_aborted(journal)) {
 			err = journal->j_errno;
-			goto out_err;
+			goto out_unlock;
 		}
 
 		handle_data_mode(s, mount_options);
@@ -1415,7 +1421,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 		s->s_flags &= ~MS_RDONLY;	/* now it is safe to call journal_begin */
 		err = journal_begin(&th, s, 10);
 		if (err)
-			goto out_err;
+			goto out_unlock;
 
 		/* Mount a partition which is read-only, read-write */
 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
@@ -1432,10 +1438,16 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	SB_JOURNAL(s)->j_must_wait = 1;
 	err = journal_end(&th, s, 10);
 	if (err)
-		goto out_err;
+		goto out_unlock;
 
 	if (!(*mount_flags & MS_RDONLY)) {
+		/*
+		 * Drop write lock. Quota will retake it when needed and lock
+		 * ordering requires calling dquot_resume() without it.
+		 */
+		reiserfs_write_unlock(s);
 		dquot_resume(s, -1);
+		reiserfs_write_lock(s);
 		finish_unfinished(s);
 		reiserfs_xattr_init(s, *mount_flags);
 	}
@@ -1445,9 +1457,10 @@ out_ok:
 	reiserfs_write_unlock(s);
 	return 0;
 
+out_unlock:
+	reiserfs_write_unlock(s);
 out_err:
 	kfree(new_opts);
-	reiserfs_write_unlock(s);
 	return err;
 }
 
-- 
1.7.9.5

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