mir/criu
2
0
Fork 0
mirror of https://github.com/checkpoint-restore/criu synced 2025-08-31 06:15:24 +00:00
Code Issues Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

48
cr-restore.c
View File

@@ -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);

2
image.c
View File

@@ -157,6 +157,8 @@ struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX] = {
FD_ENTRY(FILE_LOCKS, "filelocks-%d", show_file_locks),
FD_ENTRY(RLIMIT, "rlimit", show_rlimit),
FD_ENTRY(PAGES, "pages-%u", NULL),
FD_ENTRY(PAGES_OLD, "pages-%d", NULL),
FD_ENTRY(SHM_PAGES_OLD, "pages-shmem-%ld", NULL),
FD_ENTRY(SIGNAL, "signal-s-%d", show_siginfo), /* shared signals */
FD_ENTRY(PSIGNAL, "signal-p-%d", show_siginfo), /* private signals */
};

3
include/crtools.h
View File

@@ -86,6 +86,9 @@ enum {
CR_FD_PAGES,
CR_FD_PSIGNAL,
CR_FD_PAGES_OLD,
CR_FD_SHM_PAGES_OLD,
CR_FD_MAX
};

3
include/magic.h
View File

@@ -72,4 +72,7 @@
#define ROUTE_MAGIC RAW_IMAGE_MAGIC
#define TMPFS_MAGIC RAW_IMAGE_MAGIC
#define PAGES_OLD_MAGIC PAGEMAP_MAGIC
#define SHM_PAGES_OLD_MAGIC PAGEMAP_MAGIC
#endif /* __CR_MAGIC_H__ */

51
shmem.c
View File

@@ -139,30 +139,51 @@ static int restore_shmem_content(void *addr, struct shmem_info *si)
int fd, fd_pg, ret = 0;
fd = open_image_ro(CR_FD_SHMEM_PAGEMAP, si->shmid);
if (fd < 0)
goto err_unmap;
fd_pg = open_pages_image(O_RSTR, fd);
if (fd_pg < 0)
goto out_close;
if (fd < 0) {
fd_pg = open_image_ro(CR_FD_SHM_PAGES_OLD, si->shmid);
if (fd_pg < 0)
goto err_unmap;
} else {
fd_pg = open_pages_image(O_RSTR, fd);
if (fd_pg < 0)
goto out_close;
}
while (1) {
PagemapEntry *pe;
unsigned long vaddr;
unsigned nr_pages;
ret = pb_read_one_eof(fd, &pe, PB_PAGEMAP);
if (ret <= 0)
if (fd >= 0) {
PagemapEntry *pe;
ret = pb_read_one_eof(fd, &pe, PB_PAGEMAP);
if (ret <= 0)
break;
vaddr = (unsigned long)decode_pointer(pe->vaddr);
nr_pages = pe->nr_pages;
pagemap_entry__free_unpacked(pe, NULL);
} else {
__u64 img_vaddr;
ret = read_img_eof(fd_pg, &img_vaddr);
if (ret <= 0)
break;
vaddr = (unsigned long)decode_pointer(img_vaddr);
nr_pages = 1;
}
if (vaddr + nr_pages * PAGE_SIZE > si->size)
break;
if (pe->vaddr + pe->nr_pages * PAGE_SIZE > si->size)
break;
ret = read(fd_pg, addr + pe->vaddr, pe->nr_pages * PAGE_SIZE);
if (ret != pe->nr_pages * PAGE_SIZE) {
ret = read(fd_pg, addr + vaddr, nr_pages * PAGE_SIZE);
if (ret != nr_pages * PAGE_SIZE) {
ret = -1;
break;
}
pagemap_entry__free_unpacked(pe, NULL);
}
close(fd_pg);