+ ext3-wait-on-all-pending-commits-in-ext3_sync_fs.patch added to -mm tree
diff mbox

Message ID 200811032037.mA3Kbud5019550@imap1.linux-foundation.org
State Accepted, archived
Headers show

Commit Message

Andrew Morton Nov. 3, 2008, 8:37 p.m. UTC
The patch titled
     ext3: wait on all pending commits in ext3_sync_fs
has been added to the -mm tree.  Its filename is
     ext3-wait-on-all-pending-commits-in-ext3_sync_fs.patch

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------------------------------------------------------
Subject: ext3: wait on all pending commits in ext3_sync_fs
From: Arthur Jones <ajones@riverbed.com>

In ext3_sync_fs, we only wait for a commit to finish if we started it, but
there may be one already in progress which will not be synced.

In the case of a data=ordered umount with pending long symlinks which are
delayed due to a long list of other I/O on the backing block device, this
causes the buffer associated with the long symlinks to not be moved to the
inode dirty list in the second phase of fsync_super.  Then, before they
can be dirtied again, kjournald exits, seeing the UMOUNT flag and the
dirty pages are never written to the backing block device, causing long
symlink corruption and exposing new or previously freed block data to
userspace.

This can be reproduced with a script created
by Eric Sandeen <sandeen@redhat.com>:

	#!/bin/bash

	umount /mnt/test2
	mount /dev/sdb4 /mnt/test2
	rm -f /mnt/test2/*
	dd if=/dev/zero of=/mnt/test2/bigfile bs=1M count=512
	touch
	/mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
	ln -s
	/mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
	/mnt/test2/link
	umount /mnt/test2
	mount /dev/sdb4 /mnt/test2
	ls /mnt/test2/
	umount /mnt/test2

To ensure all commits are synced, we flush all journal commits now when
sync_fs'ing ext3.

Signed-off-by: Arthur Jones <ajones@riverbed.com>
Eric Sandeen <sandeen@redhat.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: <stable@kernel.org>		[2.6.everything]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ext3/super.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Patch
diff mbox

diff -puN fs/ext3/super.c~ext3-wait-on-all-pending-commits-in-ext3_sync_fs fs/ext3/super.c
--- a/fs/ext3/super.c~ext3-wait-on-all-pending-commits-in-ext3_sync_fs
+++ a/fs/ext3/super.c
@@ -2390,13 +2390,12 @@  static void ext3_write_super (struct sup
 
 static int ext3_sync_fs(struct super_block *sb, int wait)
 {
-	tid_t target;
-
 	sb->s_dirt = 0;
-	if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
-		if (wait)
-			log_wait_commit(EXT3_SB(sb)->s_journal, target);
-	}
+	if (wait)
+		ext3_force_commit(sb);
+	else
+		journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
+
 	return 0;
 }