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pvfs_bufmap_copy_from_iovec(): don't rely upon size being equal to iov_iter_count(iter)

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro 2015-10-08 17:47:44 -04:00 • committed by Mike Marshall
parent 5c278228bb
commit 34204fde4c
1 changed files with 11 additions and 12 deletions
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23
fs/orangefs/pvfs2-bufmap.c
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@ -512,26 +512,25 @@ int pvfs_bufmap_copy_from_iovec(struct pvfs2_bufmap *bufmap,
int buffer_index,
size_t size)
{
struct pvfs_bufmap_desc *to;
struct page *page;
size_t copied;
struct pvfs_bufmap_desc *to = &bufmap->desc_array[buffer_index];
int i;
gossip_debug(GOSSIP_BUFMAP_DEBUG,
"%s: buffer_index:%d: size:%lu:\n",
"%s: buffer_index:%d: size:%zu:\n",
__func__, buffer_index, size);
to = &bufmap->desc_array[buffer_index];
for (i = 0; size; i++) {
page = to->page_array[i];
copied = copy_page_from_iter(page, 0, PAGE_SIZE, iter);
size -= copied;
if ((copied == 0) && (size))
break;
struct page *page = to->page_array[i];
size_t n = size;
if (n > PAGE_SIZE)
n = PAGE_SIZE;
n = copy_page_from_iter(page, 0, n, iter);
if (!n)
return -EFAULT;
size -= n;
}
return size ? -EFAULT : 0;
return 0;
}