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iov: Add iovec2pagemap() helper

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2014-06-19 15:38:26 +04:00
parent cd34724092
commit 3b995f1aef
3 changed files with 9 additions and 5 deletions
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1
include/page-read.h
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@ -71,6 +71,7 @@ struct page_read {
extern int open_page_read(int pid, struct page_read *, int flags, bool shmem);
extern int open_page_read_at(int dfd, int pid, struct page_read *pr, int flags, bool shmem);
extern void pagemap2iovec(PagemapEntry *pe, struct iovec *iov);
extern void iovec2pagemap(struct iovec *iov, PagemapEntry *pe);
extern int seek_pagemap_page(struct page_read *pr, unsigned long vaddr, bool warn);
extern int dedup_one_iovec(struct page_read *pr, struct iovec *iov);

6
page-read.c
View File

@ -49,6 +49,12 @@ void pagemap2iovec(PagemapEntry *pe, struct iovec *iov)
iov->iov_len = pe->nr_pages * PAGE_SIZE;
}
void iovec2pagemap(struct iovec *iov, PagemapEntry *pe)
{
pe->vaddr = encode_pointer(iov->iov_base);
pe->nr_pages = iov->iov_len / PAGE_SIZE;
}
static int get_pagemap(struct page_read *pr, struct iovec *iov)
{
int ret;

7
page-xfer.c
View File

@ -457,9 +457,7 @@ static int write_pagemap_loc(struct page_xfer *xfer,
int ret;
PagemapEntry pe = PAGEMAP_ENTRY__INIT;
pe.vaddr = encode_pointer(iov->iov_base);
pe.nr_pages = iov->iov_len / PAGE_SIZE;
iovec2pagemap(iov, &pe);
if (opts.auto_dedup && xfer->parent != NULL) {
ret = dedup_one_iovec(xfer->parent, iov);
if (ret == -1) {
@ -544,8 +542,7 @@ static int write_pagehole_loc(struct page_xfer *xfer, struct iovec *iov)
}
}
pe.vaddr = encode_pointer(iov->iov_base);
pe.nr_pages = iov->iov_len / PAGE_SIZE;
iovec2pagemap(iov, &pe);
pe.has_in_parent = true;
pe.in_parent = true;