From: <gregkh@linuxfoundation.org>
To: jack@suse.cz, alexander.levin@microsoft.com, gregkh@linuxfoundation.org
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "reiserfs: Make cancel_old_flush() reliable" has been added to the 3.18-stable tree
Date: Mon, 19 Mar 2018 10:13:19 +0100 [thread overview]
Message-ID: <1521450799201161@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
reiserfs: Make cancel_old_flush() reliable
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
reiserfs-make-cancel_old_flush-reliable.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Mon Mar 19 10:11:52 CET 2018
From: Jan Kara <jack@suse.cz>
Date: Wed, 5 Apr 2017 14:09:48 +0200
Subject: reiserfs: Make cancel_old_flush() reliable
From: Jan Kara <jack@suse.cz>
[ Upstream commit 71b0576bdb862e964a82c73327cdd1a249c53e67 ]
Currently canceling of delayed work that flushes old data using
cancel_old_flush() does not prevent work from being requeued. Thus
in theory new work can be queued after cancel_old_flush() from
reiserfs_freeze() has run. This will become larger problem once
flush_old_commits() can requeue the work itself.
Fix the problem by recording in sbi->work_queue that flushing work is
canceled and should not be requeued.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/reiserfs/journal.c | 2 +-
fs/reiserfs/reiserfs.h | 1 +
fs/reiserfs/super.c | 21 +++++++++++++++------
3 files changed, 17 insertions(+), 7 deletions(-)
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -1961,7 +1961,7 @@ static int do_journal_release(struct rei
* will be requeued because superblock is being shutdown and doesn't
* have MS_ACTIVE set.
*/
- cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
+ reiserfs_cancel_old_flush(sb);
/* wait for all commits to finish */
cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
--- a/fs/reiserfs/reiserfs.h
+++ b/fs/reiserfs/reiserfs.h
@@ -2946,6 +2946,7 @@ int reiserfs_allocate_list_bitmaps(struc
struct reiserfs_list_bitmap *, unsigned int);
void reiserfs_schedule_old_flush(struct super_block *s);
+void reiserfs_cancel_old_flush(struct super_block *s);
void add_save_link(struct reiserfs_transaction_handle *th,
struct inode *inode, int truncate);
int remove_save_link(struct inode *inode, int truncate);
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -89,7 +89,9 @@ static void flush_old_commits(struct wor
s = sbi->s_journal->j_work_sb;
spin_lock(&sbi->old_work_lock);
- sbi->work_queued = 0;
+ /* Avoid clobbering the cancel state... */
+ if (sbi->work_queued == 1)
+ sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
reiserfs_sync_fs(s, 1);
@@ -116,21 +118,22 @@ void reiserfs_schedule_old_flush(struct
spin_unlock(&sbi->old_work_lock);
}
-static void cancel_old_flush(struct super_block *s)
+void reiserfs_cancel_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
- cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
spin_lock(&sbi->old_work_lock);
- sbi->work_queued = 0;
+ /* Make sure no new flushes will be queued */
+ sbi->work_queued = 2;
spin_unlock(&sbi->old_work_lock);
+ cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
}
static int reiserfs_freeze(struct super_block *s)
{
struct reiserfs_transaction_handle th;
- cancel_old_flush(s);
+ reiserfs_cancel_old_flush(s);
reiserfs_write_lock(s);
if (!(s->s_flags & MS_RDONLY)) {
@@ -151,7 +154,13 @@ static int reiserfs_freeze(struct super_
static int reiserfs_unfreeze(struct super_block *s)
{
+ struct reiserfs_sb_info *sbi = REISERFS_SB(s);
+
reiserfs_allow_writes(s);
+ spin_lock(&sbi->old_work_lock);
+ /* Allow old_work to run again */
+ sbi->work_queued = 0;
+ spin_unlock(&sbi->old_work_lock);
return 0;
}
@@ -2164,7 +2173,7 @@ error_unlocked:
if (sbi->commit_wq)
destroy_workqueue(sbi->commit_wq);
- cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
+ reiserfs_cancel_old_flush(s);
reiserfs_free_bitmap_cache(s);
if (SB_BUFFER_WITH_SB(s))
Patches currently in stable-queue which might be from jack@suse.cz are
queue-3.18/reiserfs-make-cancel_old_flush-reliable.patch
reply other threads:[~2018-03-19 9:15 UTC|newest]
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