From c310e72c89926e06138e4881f21e4c8da3e7ef18 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 20 Nov 2014 09:21:14 -0500 Subject: rds: switch ->inc_copy_to_user() to passing iov_iter instances get considerably simpler from that... Signed-off-by: Al Viro --- net/rds/ib_recv.c | 37 +++++++++++-------------------------- 1 file changed, 11 insertions(+), 26 deletions(-) (limited to 'net/rds/ib_recv.c') diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index d67de453c35a..1b981a4e42c2 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -472,15 +472,12 @@ static struct list_head *rds_ib_recv_cache_get(struct rds_ib_refill_cache *cache return head; } -int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *first_iov, - size_t size) +int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to) { struct rds_ib_incoming *ibinc; struct rds_page_frag *frag; - struct iovec *iov = first_iov; unsigned long to_copy; unsigned long frag_off = 0; - unsigned long iov_off = 0; int copied = 0; int ret; u32 len; @@ -489,37 +486,25 @@ int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *first_iov, frag = list_entry(ibinc->ii_frags.next, struct rds_page_frag, f_item); len = be32_to_cpu(inc->i_hdr.h_len); - while (copied < size && copied < len) { + while (iov_iter_count(to) && copied < len) { if (frag_off == RDS_FRAG_SIZE) { frag = list_entry(frag->f_item.next, struct rds_page_frag, f_item); frag_off = 0; } - while (iov_off == iov->iov_len) { - iov_off = 0; - iov++; - } - - to_copy = min(iov->iov_len - iov_off, RDS_FRAG_SIZE - frag_off); - to_copy = min_t(size_t, to_copy, size - copied); + to_copy = min_t(unsigned long, iov_iter_count(to), + RDS_FRAG_SIZE - frag_off); to_copy = min_t(unsigned long, to_copy, len - copied); - rdsdebug("%lu bytes to user [%p, %zu] + %lu from frag " - "[%p, %u] + %lu\n", - to_copy, iov->iov_base, iov->iov_len, iov_off, - sg_page(&frag->f_sg), frag->f_sg.offset, frag_off); - /* XXX needs + offset for multiple recvs per page */ - ret = rds_page_copy_to_user(sg_page(&frag->f_sg), - frag->f_sg.offset + frag_off, - iov->iov_base + iov_off, - to_copy); - if (ret) { - copied = ret; - break; - } + rds_stats_add(s_copy_to_user, to_copy); + ret = copy_page_to_iter(sg_page(&frag->f_sg), + frag->f_sg.offset + frag_off, + to_copy, + to); + if (ret != to_copy) + return -EFAULT; - iov_off += to_copy; frag_off += to_copy; copied += to_copy; } -- cgit v1.2.3