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page-xfer: Handle partial splicing

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In case if pipe buffers are full the splicing
may wakeup reader first with incomplete data
transfer. Thus splice data in cycle.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Cyrill Gorcunov 2018-08-10 18:00:51 +03:00 • committed by Andrei Vagin
parent 1c37c0d46b
commit c5f8748b72
1 changed files with 11 additions and 3 deletions
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14
criu/page-xfer.c
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@ -147,11 +147,19 @@ static inline int send_psi(int sk, struct page_server_iov *pi)
static int write_pages_to_server(struct page_xfer *xfer,
int p, unsigned long len)
{
ssize_t ret, left = len;
pr_debug("Splicing %lu bytes / %lu pages into socket\n", len, len / PAGE_SIZE);
if (splice(p, NULL, xfer->sk, NULL, len, SPLICE_F_MOVE) != len) {
pr_perror("Can't write pages to socket");
return -1;
while (left > 0) {
ret = splice(p, NULL, xfer->sk, NULL, left, SPLICE_F_MOVE);
if (ret < 0) {
pr_perror("Can't write pages to socket");
return -1;
}
pr_debug("\tSpliced: %lu bytes sent\n", (unsigned long)ret);
left -= ret;
}
return 0;