tree 006423477542cea861ad3189645b46209d09cccd
parent 093486c453a55230ccdad4b48863b872fe68c46e
author Miao Xie <miaox@cn.fujitsu.com> 1356002349 +0000
committer Josef Bacik <jbacik@fusionio.com> 1361371002 -0500

Btrfs: flush all dirty inodes if writeback can not start

We may try to flush some dirty pages when there is no enough space to reserve.
But it is possible that this operation fails, in order to get enough space to
reserve successfully, we will sync all the delalloc file. This operation is
safe, we needn't worry about the case that the filesystem goes from r/w to r/o.
because the filesystem should guarantee all the dirty pages have been written
into the disk after it becomes readonly, so the sync operation will do nothing
if the filesystem is already readonly. Though it may waste lots of time,
as a corner case, we needn't care.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>