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pages: Accept pages images from versions v0.4 and below

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After reworkring the way pagemap is stored the backward compatibility
was not preserved for patches simplicity. Time to return it back.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2013-03-27 13:12:02 +04:00
parent 18242f8319
commit 421d46f79e
5 changed files with 76 additions and 31 deletions
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48
cr-restore.c
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@@ -277,29 +277,47 @@ static int restore_priv_vma_content(pid_t pid)
vma = list_first_entry(&rst_vmas.h, struct vma_area, list);
fd = open_image_ro(CR_FD_PAGEMAP, (long)pid);
if (fd < 0)
return -1;
fd_pg = open_pages_image(O_RSTR, fd);
if (fd_pg < 0) {
close(fd);
return -1;
if (fd < 0) {
fd_pg = open_image_ro(CR_FD_PAGES_OLD, pid);
if (fd_pg < 0)
return -1;
} else {
fd_pg = open_pages_image(O_RSTR, fd);
if (fd_pg < 0) {
close(fd);
return -1;
}
}
/*
* Read page contents.
*/
while (1) {
PagemapEntry *pe;
unsigned long off, i;
unsigned long off, i, nr_pages;;
ret = pb_read_one_eof(fd, &pe, PB_PAGEMAP);
if (ret <= 0)
break;
if (fd >= 0) {
PagemapEntry *pe;
va = (unsigned long)decode_pointer(pe->vaddr);
ret = pb_read_one_eof(fd, &pe, PB_PAGEMAP);
if (ret <= 0)
break;
for (i = 0; i < pe->nr_pages; i++) {
va = (unsigned long)decode_pointer(pe->vaddr);
nr_pages = pe->nr_pages;
pagemap_entry__free_unpacked(pe, NULL);
} else {
__u64 img_va;
ret = read_img_eof(fd_pg, &img_va);
if (ret <= 0)
break;
va = (unsigned long)decode_pointer(img_va);
nr_pages = 1;
}
for (i = 0; i < nr_pages; i++) {
unsigned char buf[PAGE_SIZE];
void *p;
@@ -350,8 +368,6 @@ static int restore_priv_vma_content(pid_t pid)
memcpy(p, buf, PAGE_SIZE);
nr_restored++;
}
pagemap_entry__free_unpacked(pe, NULL);
}
close(fd_pg);
close(fd);