size_t count)
{
WARN_ON(direction & ~(READ | WRITE));
- WARN_ON_ONCE(uaccess_kernel());
*i = (struct iov_iter) {
.iter_type = ITER_IOVEC,
.data_source = direction,
}
static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
- struct csum_state *csstate,
- struct iov_iter *i)
+ struct iov_iter *i, __wsum *sump)
{
struct pipe_inode_info *pipe = i->pipe;
unsigned int p_mask = pipe->ring_size - 1;
- __wsum sum = csstate->csum;
- size_t off = csstate->off;
+ __wsum sum = *sump;
+ size_t off = 0;
unsigned int i_head;
- size_t n, r;
+ size_t r;
if (!sanity(i))
return 0;
- bytes = n = push_pipe(i, bytes, &i_head, &r);
- if (unlikely(!n))
- return 0;
- do {
- size_t chunk = min_t(size_t, n, PAGE_SIZE - r);
- char *p = kmap_atomic(pipe->bufs[i_head & p_mask].page);
- sum = csum_and_memcpy(p + r, addr, chunk, sum, off);
- kunmap_atomic(p);
+ bytes = push_pipe(i, bytes, &i_head, &r);
+ while (bytes) {
+ size_t chunk = min_t(size_t, bytes, PAGE_SIZE - r);
+ char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page);
+ sum = csum_and_memcpy(p + r, addr + off, chunk, sum, off);
+ kunmap_local(p);
i->head = i_head;
i->iov_offset = r + chunk;
- n -= chunk;
+ bytes -= chunk;
off += chunk;
- addr += chunk;
r = 0;
i_head++;
- } while (n);
- i->count -= bytes;
- csstate->csum = sum;
- csstate->off = off;
- return bytes;
+ }
+ *sump = sum;
+ i->count -= off;
+ return off;
}
size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
return n;
}
-static unsigned long copy_mc_to_page(struct page *page, size_t offset,
- const char *from, size_t len)
-{
- unsigned long ret;
- char *to;
-
- to = kmap_atomic(page);
- ret = copy_mc_to_kernel(to + offset, from, len);
- kunmap_atomic(to);
-
- return ret;
-}
-
static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes,
struct iov_iter *i)
{
if (!sanity(i))
return 0;
- bytes = n = push_pipe(i, bytes, &i_head, &off);
- if (unlikely(!n))
- return 0;
- do {
+ n = push_pipe(i, bytes, &i_head, &off);
+ while (n) {
size_t chunk = min_t(size_t, n, PAGE_SIZE - off);
+ char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page);
unsigned long rem;
-
- rem = copy_mc_to_page(pipe->bufs[i_head & p_mask].page,
- off, addr, chunk);
+ rem = copy_mc_to_kernel(p + off, addr + xfer, chunk);
+ chunk -= rem;
+ kunmap_local(p);
i->head = i_head;
- i->iov_offset = off + chunk - rem;
- xfer += chunk - rem;
+ i->iov_offset = off + chunk;
+ xfer += chunk;
if (rem)
break;
n -= chunk;
- addr += chunk;
off = 0;
i_head++;
- } while (n);
+ }
i->count -= xfer;
return xfer;
}
do {
size_t chunk = min_t(size_t, n, PAGE_SIZE - off);
- memzero_page(pipe->bufs[i_head & p_mask].page, off, chunk);
+ char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page);
+ memset(p + off, 0, chunk);
+ kunmap_local(p);
i->head = i_head;
i->iov_offset = off + chunk;
n -= chunk;
}
iterate_and_advance(i, bytes, base, len, off, ({
next = csum_and_copy_from_user(base, addr + off, len);
- if (next)
- sum = csum_block_add(sum, next, off);
+ sum = csum_block_add(sum, next, off);
next ? 0 : len;
}), ({
sum = csum_and_memcpy(addr + off, base, len, sum, off);
struct csum_state *csstate = _csstate;
__wsum sum, next;
- if (unlikely(iov_iter_is_pipe(i)))
- return csum_and_copy_to_pipe_iter(addr, bytes, _csstate, i);
-
- sum = csum_shift(csstate->csum, csstate->off);
if (unlikely(iov_iter_is_discard(i))) {
WARN_ON(1); /* for now */
return 0;
}
- iterate_and_advance(i, bytes, base, len, off, ({
+
+ sum = csum_shift(csstate->csum, csstate->off);
+ if (unlikely(iov_iter_is_pipe(i)))
+ bytes = csum_and_copy_to_pipe_iter(addr, bytes, i, &sum);
+ else iterate_and_advance(i, bytes, base, len, off, ({
next = csum_and_copy_to_user(addr + off, base, len);
- if (next)
- sum = csum_block_add(sum, next, off);
+ sum = csum_block_add(sum, next, off);
next ? 0 : len;
}), ({
sum = csum_and_memcpy(base, addr + off, len, sum, off);