ceph: limit osd write size

OSD has a configurable limitation of max write size. OSD return
error if write request size is larger than the limitation. For now,
set max write size to CEPH_MSG_MAX_DATA_LEN. It should be small
enough.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 85f0dba394a2..a39ff54cb372 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -887,7 +887,9 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
                         break;
                 }
 
-                if (!write)
+                if (write)
+                        size = min_t(u64, size, fsc->mount_options->wsize);
+                else
                         size = min_t(u64, size, fsc->mount_options->rsize);
 
                 len = size;