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page-read: Support reading by chunks

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This is needed for the case when we get data from image-cache/proxy socket.

Signed-off-by: Rodrigo Bruno <rbruno@gsd.inesc-id.pt>
Signed-off-by: Katerina Koukiou <k.koukiou@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
rbruno@gsd.inesc-id.pt
2017-02-11 04:34:43 +01:00
committed by Pavel Emelyanov
parent b43f3f54be
commit 86b9170ff3
1 changed files with 10 additions and 4 deletions
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14
criu/pagemap.c
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@@ -249,6 +249,7 @@ static int read_local_page(struct page_read *pr, unsigned long vaddr,
{
int fd = img_raw_fd(pr->pi);
int ret;
size_t curr = 0;
/*
* Flush any pending async requests if any not to break the
@@ -258,10 +259,15 @@ static int read_local_page(struct page_read *pr, unsigned long vaddr,
return -1;
pr_debug("\tpr%u Read page from self %lx/%"PRIx64"\n", pr->id, pr->cvaddr, pr->pi_off);
ret = pread(fd, buf, len, pr->pi_off);
if (ret != len) {
pr_perror("Can't read mapping page %d", ret);
return -1;
while (1) {
ret = pread(fd, buf + curr, len - curr, pr->pi_off + curr);
if (ret < 1) {
pr_perror("Can't read mapping page %d", ret);
return -1;
}
curr += ret;
if (curr == len)
break;
}
if (opts.auto_dedup) {