tree 8f74edaae6bfb61178af444a9c68fc5cf791f8da
parent 77310320c299b0dc050037ff8fc29fd1861fb005
author Yan, Zheng <zyan@redhat.com> 1460699772 +0800
committer Ilya Dryomov <idryomov@gmail.com> 1464218132 +0200

ceph: don't call truncate_pagecache in ceph_writepages_start

truncate_pagecache() may decrease inode's reference. This can cause
deadlock if inode's last reference is dropped and iput_final() wants
to evict the inode. (evict() calls inode_wait_for_writeback(), which
waits for ceph_writepages_start() to return).

The fix is use work thead to truncate dirty pages. Also add 'forced
umount' check to ceph_update_writeable_page(), which prevents new
pages getting dirty.

Signed-off-by: Yan, Zheng <zyan@redhat.com>