mirror of
https://github.com/checkpoint-restore/criu.git
synced 2026-01-23 02:14:37 +00:00
88aaae3ace
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com> Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
101 lines
2 KiB
C
101 lines
2 KiB
C
#include <sys/mount.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "criu-plugin.h"
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#include "criu-log.h"
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#define IMG_NAME "ext-mount-test-%d.img"
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extern cr_plugin_init_t cr_plugin_init;
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extern cr_plugin_dump_ext_mount_t cr_plugin_dump_ext_mount;
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extern cr_plugin_restore_ext_mount_t cr_plugin_restore_ext_mount;
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int cr_plugin_init(void)
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{
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pr_info("Initialized ext mount c/r\n");
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return 0;
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}
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int cr_plugin_dump_ext_mount(char *mountpoint, int id)
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{
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char *aux, *dst;
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int fd;
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char img[64];
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pr_info("Check for ext mount %s being mine\n", mountpoint);
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aux = strrchr(mountpoint, '/');
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if (!aux) {
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pr_err("Bad path provided\n");
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return -ENOTSUP;
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}
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dst = getenv("EMP_MOUNTPOINT");
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if (!dst) {
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pr_err("No EMP_MOUNTPOINT env\n");
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return -1;
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}
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if (strcmp(aux + 1, dst)) {
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pr_info("Not mine\n");
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return -ENOTSUP;
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}
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pr_info("Dumping my mount %d\n", id);
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sprintf(img, IMG_NAME, id);
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fd = openat(criu_get_image_dir(), img,
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O_RDWR | O_CREAT | O_TRUNC, 0600);
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if (fd < 0) {
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pr_perror("Can't open image");
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return -1;
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}
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close(fd);
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return 0;
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}
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int cr_plugin_restore_ext_mount(int id, char *mountpoint, char *old_root, int *is_file)
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{
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int fd;
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char img[64], src[256], *src_file;
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pr_info("Restoring my mount %d?\n", id);
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sprintf(img, IMG_NAME, id);
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fd = openat(criu_get_image_dir(), img, O_RDONLY);
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if (fd < 0) {
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if (errno == ENOENT)
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return -ENOTSUP;
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pr_perror("Can't open my image");
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return -1;
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}
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close(fd);
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src_file = getenv("EMP_ROOT_P");
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if (!src_file) {
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pr_err("Can't get EMP_ROOT_P env\n");
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return -1;
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}
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if (creat(mountpoint, 0600) < 0) {
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if (errno != EEXIST) {
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pr_perror("Can't make mountpoint");
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return -1;
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}
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}
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if (is_file)
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*is_file = 1;
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sprintf(src, "/%s/%s", old_root, src_file);
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pr_info("Mount %s -> %s\n", src, mountpoint);
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if (mount(src, mountpoint, NULL, MS_BIND, NULL) < 0) {
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pr_perror("Can't bind mount");
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return -1;
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}
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return 0;
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}
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