[PATCH 4.9 151/153] ceph: update readpages osd request according to size of pages

Greg Kroah-Hartman
2017-03-10T14:53:07Z

From: Yan, Zheng <zyan@redhat.com>

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>

---
fs/ceph/addr.c | 1 +
net/ceph/osd_client.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)

--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -363,6 +363,7 @@ static int start_read(struct inode *inod
nr_pages = i;
if (nr_pages > 0) {
len = nr_pages << PAGE_SHIFT;
+ osd_req_op_extent_update(req, 0, len);
break;
}
goto out_pages;
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -672,7 +672,8 @@ void osd_req_op_extent_update(struct cep
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);