From ffc79664d15841025d90afdd902c4112ffe168d6 Mon Sep 17 00:00:00 2001 From: Milosz Tanski Date: Wed, 25 Sep 2013 11:18:14 -0400 Subject: [PATCH] ceph: hung on ceph fscache invalidate in some cases In some cases I'm on my ceph client cluster I'm seeing hunk kernel tasks in the invalidate page code path. This is due to the fact that we don't check if the page is marked as cache before calling fscache_wait_on_page_write(). This is the log from the hang INFO: task XXXXXX:12034 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ... Call Trace: [] schedule+0x29/0x70 [] __fscache_wait_on_page_write+0x6d/0xb0 [fscache] [] ? add_wait_queue+0x60/0x60 [] ceph_invalidate_fscache_page+0x29/0x50 [ceph] [] ceph_invalidatepage+0x70/0x190 [ceph] [] ? delete_from_page_cache+0x5f/0x70 [] truncate_inode_page+0x8b/0x90 [] truncate_inode_pages_range.part.12+0x13d/0x620 [] truncate_inode_pages_range+0x4d/0x60 [] truncate_inode_pages+0x15/0x20 [] evict+0x1a6/0x1b0 [] iput+0x103/0x190 ... Signed-off-by: Milosz Tanski Reviewed-by: Sage Weil --- fs/ceph/cache.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ceph/cache.c b/fs/ceph/cache.c index 6bfe65e0b038..360b622b0be0 100644 --- a/fs/ceph/cache.c +++ b/fs/ceph/cache.c @@ -324,6 +324,9 @@ void ceph_invalidate_fscache_page(struct inode* inode, struct page *page) { struct ceph_inode_info *ci = ceph_inode(inode); + if (!PageFsCache(page)) + return; + fscache_wait_on_page_write(ci->fscache, page); fscache_uncache_page(ci->fscache, page); } -- 2.20.1