3.4-stable patches

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

diff --git a/queue-3.4/series b/queue-3.4/series
index 4064b84df5b86cc467e55788e2b2ae52226d3edf..32b08fb29ac63e4c7c332b1a270530ec5c821b4e 100644 (file)
--- a/queue-3.4/series
+++ b/queue-3.4/series
@@ -39,3 +39,4 @@ ifb-fix-oops-when-loading-the-ifb-failed.patch
 atl1e-fix-dma-mapping-warnings.patch
 atl1e-unmap-partially-mapped-skb-on-dma-error-and-free-skb.patch
 vlan-fix-a-race-in-egress-prio-management.patch
+writeback-fix-periodic-writeback-after-fs-mount.patch

diff --git a/queue-3.4/writeback-fix-periodic-writeback-after-fs-mount.patch b/queue-3.4/writeback-fix-periodic-writeback-after-fs-mount.patch
new file mode 100644 (file)
index 0000000..b9b20a5
--- /dev/null
+++ b/queue-3.4/writeback-fix-periodic-writeback-after-fs-mount.patch
@@ -0,0 +1,58 @@
+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 |    9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+--- a/fs/block_dev.c
++++ b/fs/block_dev.c
+@@ -57,17 +57,24 @@ static void bdev_inode_switch_bdi(struct
+                       struct backing_dev_info *dst)
+ {
+       struct backing_dev_info *old = inode->i_data.backing_dev_info;
++      bool wakeup_bdi = false;
+ 
+       if (unlikely(dst == old))               /* deadlock avoidance */
+               return;
+       bdi_lock_two(&old->wb, &dst->wb);
+       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(&old->wb.list_lock);
+       spin_unlock(&dst->wb.list_lock);
++
++      if (wakeup_bdi)
++              bdi_wakeup_thread_delayed(dst);
+ }
+ 
+ sector_t blkdev_max_block(struct block_device *bdev)