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rds: switch rds_message_copy_from_user() to iov_iter

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-11-20 09:31:08 -05:00
parent c310e72c89
commit 083735f4b0
3 changed files with 16 additions and 33 deletions
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42
net/rds/message.c
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@@ -264,64 +264,46 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
return rm;
}
int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
size_t total_len)
int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from)
{
unsigned long to_copy;
unsigned long iov_off;
unsigned long sg_off;
struct iovec *iov;
struct scatterlist *sg;
int ret = 0;
rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
/*
* now allocate and copy in the data payload.
*/
sg = rm->data.op_sg;
iov = first_iov;
iov_off = 0;
sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
while (total_len) {
while (iov_iter_count(from)) {
if (!sg_page(sg)) {
ret = rds_page_remainder_alloc(sg, total_len,
ret = rds_page_remainder_alloc(sg, iov_iter_count(from),
GFP_HIGHUSER);
if (ret)
goto out;
return ret;
rm->data.op_nents++;
sg_off = 0;
}
while (iov_off == iov->iov_len) {
iov_off = 0;
iov++;
}
to_copy = min_t(unsigned long, iov_iter_count(from),
sg->length - sg_off);
to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
to_copy = min_t(size_t, to_copy, total_len);
rds_stats_add(s_copy_from_user, to_copy);
ret = copy_page_from_iter(sg_page(sg), sg->offset + sg_off,
to_copy, from);
if (ret != to_copy)
return -EFAULT;
rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
"sg [%p, %u, %u] + %lu\n",
to_copy, iov->iov_base, iov->iov_len, iov_off,
(void *)sg_page(sg), sg->offset, sg->length, sg_off);
ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
iov->iov_base + iov_off,
to_copy);
if (ret)
goto out;
iov_off += to_copy;
total_len -= to_copy;
sg_off += to_copy;
if (sg_off == sg->length)
sg++;
}
out:
return ret;
}