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A messenger fix, marked for stable. 

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Merge tag 'ceph-for-4.20-rc4' of https://github.com/ceph/ceph-client

Pullk ceph fix from Ilya Dryomov:
 "A messenger fix, marked for stable"

* tag 'ceph-for-4.20-rc4' of https://github.com/ceph/ceph-client:
  libceph: fall back to sendmsg for slab pages
This commit is contained in:
Linus Torvalds 2018-11-23 11:24:55 -08:00
parent 3381918fec 7e241f647d
commit 7c98a42618
1 changed files with 9 additions and 3 deletions
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12
net/ceph/messenger.c
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@ -580,9 +580,15 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
struct bio_vec bvec;
int ret;
/* sendpage cannot properly handle pages with page_count == 0,
* we need to fallback to sendmsg if that's the case */
if (page_count(page) >= 1)
/*
* sendpage cannot properly handle pages with page_count == 0,
* we need to fall back to sendmsg if that's the case.
*
* Same goes for slab pages: skb_can_coalesce() allows
* coalescing neighboring slab objects into a single frag which
* triggers one of hardened usercopy checks.
*/
if (page_count(page) >= 1 && !PageSlab(page))
return __ceph_tcp_sendpage(sock, page, offset, size, more);
bvec.bv_page = page;