From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Thu, 25 Jul 2013 23:02:52 +0000 (-0700)
Subject: 3.0-stable patches
X-Git-Tag: v3.0.88~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=af1bddb4c8ea04af805d87876e72c4f20263c7b6;p=thirdparty%2Fkernel%2Fstable-queue.git

3.0-stable patches

added patches:
	writeback-fix-periodic-writeback-after-fs-mount.patch
---

diff --git a/queue-3.0/series b/queue-3.0/series
index 4aeb4c1919c..d0c5b09a5fc 100644
--- a/queue-3.0/series
+++ b/queue-3.0/series
@@ -25,3 +25,4 @@ ifb-fix-rcu_sched-self-detected-stalls.patch
 dummy-fix-oops-when-loading-the-dummy-failed.patch
 ifb-fix-oops-when-loading-the-ifb-failed.patch
 vlan-fix-a-race-in-egress-prio-management.patch
+writeback-fix-periodic-writeback-after-fs-mount.patch
diff --git a/queue-3.0/writeback-fix-periodic-writeback-after-fs-mount.patch b/queue-3.0/writeback-fix-periodic-writeback-after-fs-mount.patch
new file mode 100644
index 00000000000..4afe52aa024
--- /dev/null
+++ b/queue-3.0/writeback-fix-periodic-writeback-after-fs-mount.patch
@@ -0,0 +1,56 @@
+From a5faeaf9109578e65e1a32e2a3e76c8b47e7dcb6 Mon Sep 17 00:00:00 2001
+From: Jan Kara <jack@suse.cz>
+Date: Fri, 28 Jun 2013 16:04:02 +0200
+Subject: writeback: Fix periodic writeback after fs mount
+
+From: Jan Kara <jack@suse.cz>
+
+commit a5faeaf9109578e65e1a32e2a3e76c8b47e7dcb6 upstream.
+
+Code in blkdev.c moves a device inode to default_backing_dev_info when
+the last reference to the device is put and moves the device inode back
+to its bdi when the first reference is acquired. This includes moving to
+wb.b_dirty list if the device inode is dirty. The code however doesn't
+setup timer to wake corresponding flusher thread and while wb.b_dirty
+list is non-empty __mark_inode_dirty() will not set it up either. Thus
+periodic writeback is effectively disabled until a sync(2) call which can
+lead to unexpected data loss in case of crash or power failure.
+
+Fix the problem by setting up a timer for periodic writeback in case we
+add the first dirty inode to wb.b_dirty list in bdev_inode_switch_bdi().
+
+Reported-by: Bert De Jonghe <Bert.DeJonghe@amplidata.com>
+Signed-off-by: Jan Kara <jack@suse.cz>
+Signed-off-by: Jens Axboe <axboe@kernel.dk>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+
+---
+ fs/block_dev.c |   10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+--- a/fs/block_dev.c
++++ b/fs/block_dev.c
+@@ -55,13 +55,21 @@ EXPORT_SYMBOL(I_BDEV);
+ static void bdev_inode_switch_bdi(struct inode *inode,
+ 			struct backing_dev_info *dst)
+ {
++	bool wakeup_bdi = false;
++
+ 	spin_lock(&inode_wb_list_lock);
+ 	spin_lock(&inode->i_lock);
+ 	inode->i_data.backing_dev_info = dst;
+-	if (inode->i_state & I_DIRTY)
++	if (inode->i_state & I_DIRTY) {
++		if (bdi_cap_writeback_dirty(dst) && !wb_has_dirty_io(&dst->wb))
++			wakeup_bdi = true;
+ 		list_move(&inode->i_wb_list, &dst->wb.b_dirty);
++	}
+ 	spin_unlock(&inode->i_lock);
+ 	spin_unlock(&inode_wb_list_lock);
++
++	if (wakeup_bdi)
++		bdi_wakeup_thread_delayed(dst);
+ }
+ 
+ sector_t blkdev_max_block(struct block_device *bdev)