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ceph: handle partial result from get_user_pages

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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>
This commit is contained in:
Henry C Chang 2010-12-17 09:55:59 -08:00 committed by Sage Weil
parent b6aa5901c7
commit 361cf40519
1 changed files with 2 additions and 2 deletions
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4
net/ceph/pagevec.c
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@ -26,12 +26,12 @@ struct page **ceph_get_direct_page_vector(const char __user *data,
rc = get_user_pages(current, current->mm, (unsigned long)data,
num_pages, write_page, 0, pages, NULL);
up_read(&current->mm->mmap_sem);
if (rc < 0)
if (rc < num_pages)
goto fail;
return pages;
fail:
kfree(pages);
ceph_put_page_vector(pages, rc > 0 ? rc : 0, false);
return ERR_PTR(rc);
}
EXPORT_SYMBOL(ceph_get_direct_page_vector);