4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ilya Dryomov <idryomov@xxxxxxxxx>
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@xxxxxxxxxxxxxxx
Fixes: 95cca2b44e54 ("ceph: limit osd write size")
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: "Yan, Zheng" <zyan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ceph/file.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -878,6 +878,11 @@ ceph_direct_read_write(struct kiocb *ioc
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,
@@ -893,11 +898,6 @@ ceph_direct_read_write(struct kiocb *ioc
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)) {
