From 4636b4e251127a727c1b3bbdad50e58b2ebf09fc Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Thu, 3 May 2018 16:10:09 +0200 Subject: [PATCH] ceph: fix rsize/wsize capping in ceph_direct_read_write() commit 3a15b38fd2efc1d648cb33186bf71e9138c93491 upstream. rsize/wsize cap should be applied before ceph_osdc_new_request() is called. Otherwise, if the size is limited by the cap instead of the stripe unit, ceph_osdc_new_request() would setup an extent op that is bigger than what dio_get_pages_alloc() would pin and add to the page vector, triggering asserts in the messenger. Cc: stable@vger.kernel.org Fixes: 95cca2b44e54 ("ceph: limit osd write size") Signed-off-by: Ilya Dryomov Reviewed-by: "Yan, Zheng" Signed-off-by: Greg Kroah-Hartman --- fs/ceph/file.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 0024d3e61bcd..6d653235e323 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -873,6 +873,11 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, size_t start = 0; ssize_t len; + if (write) + size = min_t(u64, size, fsc->mount_options->wsize); + else + size = min_t(u64, size, fsc->mount_options->rsize); + vino = ceph_vino(inode); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, pos, &size, 0, @@ -888,11 +893,6 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, break; } - if (write) - size = min_t(u64, size, fsc->mount_options->wsize); - else - size = min_t(u64, size, fsc->mount_options->rsize); - len = size; pages = dio_get_pages_alloc(iter, len, &start, &num_pages); if (IS_ERR(pages)) {