From e55f1a1871b148802b42ee3807edcb6528ffc27d Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 31 Aug 2016 12:59:29 +1000 Subject: [PATCH] ceph: remove warning when ceph_releasepage() is called on dirty page If O_DIRECT writes are racing with buffered writes, then the call to invalidate_inode_pages2_range() can call ceph_releasepage() on dirty pages. Most filesystems hold inode_lock() across O_DIRECT writes so they do not suffer this race, but cephfs deliberately drops the lock, and opens a window for the race. This race can be triggered with the generic/036 test from the xfstests test suite. It doesn't happen every time, but it does happen often. As the possibilty is expected, remove the warning, and instead include the PageDirty() status in the debug message. Signed-off-by: NeilBrown Reviewed-by: Jeff Layton Reviewed-by: Yan, Zheng --- fs/ceph/addr.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index f410a0c..ef3ebd7 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -175,9 +175,8 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset, static int ceph_releasepage(struct page *page, gfp_t g) { - dout("%p releasepage %p idx %lu\n", page->mapping->host, - page, page->index); - WARN_ON(PageDirty(page)); + dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, + page, page->index, PageDirty(page) ? "" : "not "); /* Can we release the page from the cache? */ if (!ceph_release_fscache_page(page, g)) -- 2.7.4