void
hammer_cmd_pseudofs_create(char **av, int ac, int is_slave)
{
struct hammer_ioc_pseudofs_rw pfs;
struct hammer_pseudofs_data pfsd;
struct stat st;
const char *path;
char *dirpath;
char *linkpath;
int pfs_id;
int fd;
int error;
if (ac == 0)
pseudofs_usage(1);
path = av[0];
if (lstat(path, &st) == 0) {
fprintf(stderr, "Cannot create %s, file exists!\n", path);
exit(1);
}
/*
* Figure out the directory prefix, taking care of degenerate
* cases.
*/
dirpath = strdup(path);
if (strrchr(dirpath, '/') != NULL) {
*strrchr(dirpath, '/') = 0;
if (dirpath[0] == 0) {
free(dirpath);
dirpath = strdup("/");
}
} else {
free(dirpath);
dirpath = strdup(".");
}
fd = open(dirpath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Cannot open directory %s\n", dirpath);
exit(1);
}
error = 0;
for (pfs_id = 0; pfs_id < HAMMER_MAX_PFS; ++pfs_id) {
bzero(&pfs, sizeof(pfs));
bzero(&pfsd, sizeof(pfsd));
pfs.pfs_id = pfs_id;
pfs.ondisk = &pfsd;
pfs.bytes = sizeof(pfsd);
pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
error = errno;
break;
}
}
if (pfs_id == HAMMER_MAX_PFS) {
fprintf(stderr, "Cannot create %s, all PFSs in use\n", path);
exit(1);
}
if (error != ENOENT) {
fprintf(stderr, "Cannot create %s, got %s during scan\n",
path, strerror(error));
exit(1);
}
/*
* Create the new PFS
*/
printf("Creating PFS #%d\t", pfs_id);
bzero(&pfsd, sizeof(pfsd));
init_pfsd(&pfsd, is_slave);
pfs.pfs_id = pfs_id;
pfs.ondisk = &pfsd;
pfs.bytes = sizeof(pfsd);
pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
printf("failed: %s\n", strerror(errno));
} else {
/* special symlink, must be exactly 10 characters */
asprintf(&linkpath, "@@PFS%05d", pfs_id);
if (symlink(linkpath, path) < 0) {
printf("failed: cannot create symlink: %s\n",
strerror(errno));
} else {
printf("succeeded!\n");
hammer_cmd_pseudofs_update(av, ac);
}
}
close(fd);
}
void
hammer_cmd_pseudofs_create(char **av, int ac, int is_slave)
{
struct hammer_ioc_pseudofs_rw pfs;
struct hammer_pseudofs_data pfsd;
struct stat st;
const char *path;
char *dirpath;
char *linkpath;
int pfs_id;
int fd;
int error;
if (ac == 0)
pseudofs_usage(1);
path = av[0];
if (lstat(path, &st) == 0) {
fprintf(stderr, "Cannot create %s, file exists!\n", path);
exit(1);
}
/*
* Figure out the directory prefix, taking care of degenerate
* cases.
*/
dirpath = getdir(path);
fd = open(dirpath, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Cannot open directory %s\n", dirpath);
exit(1);
}
/*
* Avoid foot-shooting. Don't let the user create a PFS
* softlink via a PFS. PFS softlinks may only be accessed
* via the master filesystem. Checking it here ensures
* other PFS commands access PFS under the master filesystem.
*/
bzero(&pfs, sizeof(pfs));
bzero(&pfsd, sizeof(pfsd));
pfs.pfs_id = -1;
pfs.ondisk = &pfsd;
pfs.bytes = sizeof(pfsd);
ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs);
if (pfs.pfs_id != 0) {
fprintf(stderr,
"You are attempting to access a PFS softlink "
"from a PFS. It may not represent the PFS\n"
"on the main filesystem mount that you "
"expect! You may only access PFS softlinks\n"
"via the main filesystem mount!\n");
exit(1);
}
error = 0;
for (pfs_id = 0; pfs_id < HAMMER_MAX_PFS; ++pfs_id) {
bzero(&pfs, sizeof(pfs));
bzero(&pfsd, sizeof(pfsd));
pfs.pfs_id = pfs_id;
pfs.ondisk = &pfsd;
pfs.bytes = sizeof(pfsd);
pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
error = errno;
break;
}
}
if (pfs_id == HAMMER_MAX_PFS) {
fprintf(stderr, "Cannot create %s, all PFSs in use\n", path);
exit(1);
}
if (error != ENOENT) {
fprintf(stderr, "Cannot create %s, got %s during scan\n",
path, strerror(error));
exit(1);
}
/*
* Create the new PFS
*/
printf("Creating PFS #%d\t", pfs_id);
init_pfsd(&pfsd, is_slave);
pfs.pfs_id = pfs_id;
pfs.ondisk = &pfsd;
pfs.bytes = sizeof(pfsd);
pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
printf("failed: %s\n", strerror(errno));
} else {
/* special symlink, must be exactly 10 characters */
asprintf(&linkpath, "@@PFS%05d", pfs_id);
if (symlink(linkpath, path) < 0) {
printf("failed: cannot create symlink: %s\n",
strerror(errno));
} else {
printf("succeeded!\n");
hammer_cmd_pseudofs_update(av, ac);
}
}
free(dirpath);
close(fd);
}
