ceph: update readpages osd request according to size of pages

commit d641df819db8b80198fd85d9de91137e8a823b07 upstream.

add_to_page_cache_lru() can fails, so the actual pages to read
can be smaller than the initial size of osd request. We need to
update osd request size in that case.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index ef3ebd780aff..1e643c718917 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -363,6 +363,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
                         nr_pages = i;
                         if (nr_pages > 0) {
                                 len = nr_pages << PAGE_SHIFT;
+                                osd_req_op_extent_update(req, 0, len);
                                 break;
                         }
                         goto out_pages;
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index e6ae15bc41b7..0ffeb60cfe67 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -672,7 +672,8 @@ void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
         BUG_ON(length > previous);
 
         op->extent.length = length;
-        op->indata_len -= previous - length;
+        if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
+                op->indata_len -= previous - length;
 }
 EXPORT_SYMBOL(osd_req_op_extent_update);