diff options
author | Henry C Chang <henry_c_chang@tcloudcomputing.com> | 2010-12-17 12:55:59 -0500 |
---|---|---|
committer | Sage Weil <sage@newdream.net> | 2010-12-17 12:55:59 -0500 |
commit | 361cf40519a491f68b28ad90225e4611c4bf8e12 (patch) | |
tree | ac0a77f2d6b36d4140bbaf3b8c14a37e8ae1ef11 /net | |
parent | b6aa5901c7a2bd90d0b6b9866300d2648b2568f3 (diff) |
ceph: handle partial result from get_user_pages
The get_user_pages() helper can return fewer than the requested pages.
Error out in that case, and clean up the partial result.
Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com>
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/ceph/pagevec.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c index 01947a5d03b7..1a040e64c69f 100644 --- a/net/ceph/pagevec.c +++ b/net/ceph/pagevec.c | |||
@@ -26,12 +26,12 @@ struct page **ceph_get_direct_page_vector(const char __user *data, | |||
26 | rc = get_user_pages(current, current->mm, (unsigned long)data, | 26 | rc = get_user_pages(current, current->mm, (unsigned long)data, |
27 | num_pages, write_page, 0, pages, NULL); | 27 | num_pages, write_page, 0, pages, NULL); |
28 | up_read(¤t->mm->mmap_sem); | 28 | up_read(¤t->mm->mmap_sem); |
29 | if (rc < 0) | 29 | if (rc < num_pages) |
30 | goto fail; | 30 | goto fail; |
31 | return pages; | 31 | return pages; |
32 | 32 | ||
33 | fail: | 33 | fail: |
34 | kfree(pages); | 34 | ceph_put_page_vector(pages, rc > 0 ? rc : 0, false); |
35 | return ERR_PTR(rc); | 35 | return ERR_PTR(rc); |
36 | } | 36 | } |
37 | EXPORT_SYMBOL(ceph_get_direct_page_vector); | 37 | EXPORT_SYMBOL(ceph_get_direct_page_vector); |