C++ (Cpp) rst_get_mnt_root Examples

Example #1

File: files-reg.c Project: 8472/criu

static int create_ghost(struct ghost_file *gf, GhostFileEntry *gfe, struct cr_img *img)
{
	char path[PATH_MAX];
	int ret, root_len;
	char *msg;

	root_len = ret = rst_get_mnt_root(gf->remap.rmnt_id, path, sizeof(path));
	if (ret < 0) {
		pr_err("The %d mount is not found for ghost\n", gf->remap.rmnt_id);
		goto err;
	}

	snprintf(path + ret, sizeof(path) - ret, "/%s", gf->remap.rpath);
	ret = -1;
again:
	if (S_ISFIFO(gfe->mode)) {
		if ((ret = mknod(path, gfe->mode, 0)) < 0)
			msg = "Can't create node for ghost file";
	} else if (S_ISCHR(gfe->mode) || S_ISBLK(gfe->mode)) {
		if (!gfe->has_rdev) {
			pr_err("No rdev for ghost device\n");
			goto err;
		}
		if ((ret = mknod(path, gfe->mode, gfe->rdev)) < 0)
			msg = "Can't create node for ghost dev";
	} else if (S_ISDIR(gfe->mode)) {
		if ((ret = mkdir(path, gfe->mode)) < 0) {
			pr_perror("Can't make ghost dir");
			goto err;
		}
	} else {
		if ((ret = mkreg_ghost(path, gfe->mode, gf, img)) < 0)
			msg = "Can't create ghost regfile\n";
	}

	if (ret < 0) {
		/* Use grand parent, if parent directory does not exist */
		if (errno == ENOENT) {
			if (trim_last_parent(path) < 0) {
				pr_err("trim failed: @%s@\n", path);
				goto err;
			}
			goto again;
		}

		pr_perror("%s", msg);
		goto err;
	}

	strcpy(gf->remap.rpath, path + root_len + 1);
	pr_debug("Remap rpath is %s\n", gf->remap.rpath);

	ret = -1;
	if (ghost_apply_metadata(path, gfe))
		goto err;

	ret = 0;
err:
	return ret;
}

Example #2

File: files-reg.c Project: nwmcsween/criu

static int create_ghost(struct ghost_file *gf, GhostFileEntry *gfe, struct cr_img *img)
{
	int gfd, ghost_flags, ret;
	char path[PATH_MAX];

	ret = rst_get_mnt_root(gf->remap.rmnt_id, path, sizeof(path));
	if (ret < 0) {
		pr_err("The %d mount is not found for ghost\n", gf->remap.rmnt_id);
		goto err;
	}

	snprintf(path + ret, sizeof(path) - ret, "/%s", gf->remap.rpath);
	ret = -1;

	if (S_ISFIFO(gfe->mode)) {
		if (mknod(path, gfe->mode, 0)) {
			pr_perror("Can't create node for ghost file");
			goto err;
		}
		ghost_flags = O_RDWR; /* To not block */
	} else if (S_ISCHR(gfe->mode) || S_ISBLK(gfe->mode)) {
		if (!gfe->has_rdev) {
			pr_err("No rdev for ghost device\n");
			goto err;
		}

		if (mknod(path, gfe->mode, gfe->rdev)) {
			pr_perror("Can't create node for ghost dev");
			goto err;
		}
		ghost_flags = O_WRONLY;
	} else if (S_ISDIR(gfe->mode)) {
		if (mkdir(path, gfe->mode)) {
			pr_perror("Can't make ghost dir");
			goto err;
		}
		ghost_flags = O_DIRECTORY;
	} else
		ghost_flags = O_WRONLY | O_CREAT | O_EXCL;

	gfd = open(path, ghost_flags, gfe->mode);
	if (gfd < 0) {
		pr_perror("Can't open ghost file %s", path);
		goto err;
	}

	if (fchown(gfd, gfe->uid, gfe->gid) < 0) {
		pr_perror("Can't reset user/group on ghost %s", path);
		goto err_c;
	}

	if (S_ISREG(gfe->mode)) {
		if (copy_file(img_raw_fd(img), gfd, 0) < 0)
			goto err_c;
	}

	ret = 0;
err_c:
	close(gfd);
err:
	return ret;
}