static void
zpool_open_func(void *arg)
{
rdsk_node_t *rn = arg;
#ifdef __APPLE__
struct stat statbuf;
#else
struct stat64 statbuf;
#endif
nvlist_t *config;
int num_labels;
int fd;
if (rn->rn_nozpool)
return;
#if defined (__linux__) || defined (__APPLE__)
/*
* Skip devices with well known prefixes there can be side effects
* when opening devices which need to be avoided.
*
* core - Symlink to /proc/kcore
* fd* - Floppy interface.
* fuse - Fuse control device.
* hpet - High Precision Event Timer
* lp* - Printer interface.
* parport* - Parallel port interface.
* ppp - Generic PPP driver.
* random - Random device
* rtc - Real Time Clock
* tty* - Generic serial interface.
* urandom - Random device.
* usbmon* - USB IO monitor.
* vcs* - Virtual console memory.
* watchdog - Watchdog must be closed in a special way.
*/
if ((strncmp(rn->rn_name, "core", 4) == 0) ||
(strncmp(rn->rn_name, "fd", 2) == 0) ||
(strncmp(rn->rn_name, "fuse", 4) == 0) ||
(strncmp(rn->rn_name, "hpet", 4) == 0) ||
(strncmp(rn->rn_name, "lp", 2) == 0) ||
(strncmp(rn->rn_name, "parport", 7) == 0) ||
(strncmp(rn->rn_name, "ppp", 3) == 0) ||
(strncmp(rn->rn_name, "random", 6) == 0) ||
(strncmp(rn->rn_name, "rtc", 3) == 0) ||
(strncmp(rn->rn_name, "tty", 3) == 0) ||
(strncmp(rn->rn_name, "urandom", 7) == 0) ||
(strncmp(rn->rn_name, "usbmon", 6) == 0) ||
(strncmp(rn->rn_name, "vcs", 3) == 0) ||
#ifdef __APPLE__
(strncmp(rn->rn_name, "pty", 3) == 0) || // lots, skip for speed
(strncmp(rn->rn_name, "com", 3) == 0) || // /dev/com_digidesign_semiface
#endif
(strncmp(rn->rn_name, "watchdog", 8) == 0))
return;
/*
* Ignore failed stats. We only want regular files and block devices.
*/
if (fstatat64(rn->rn_dfd, rn->rn_name, &statbuf, 0) != 0 ||
(!S_ISREG(statbuf.st_mode) && !S_ISBLK(statbuf.st_mode)))
return;
#ifdef __APPLE__
/* It is desirable to skip optical media as well, as they are
* also called /dev/diskX
*/
if (is_optical_media((char *)rn->rn_name))
return;
#endif
if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) {
/* symlink to a device that's no longer there */
if (errno == ENOENT)
nozpool_all_slices(rn->rn_avl, rn->rn_name);
return;
}
#else /* LINUX, APPLE -> IllumOS */
if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) {
/* symlink to a device that's no longer there */
if (errno == ENOENT)
nozpool_all_slices(rn->rn_avl, rn->rn_name);
return;
}
/*
* Ignore failed stats. We only want regular
* files, character devs and block devs.
*/
if (fstat64(fd, &statbuf) != 0 ||
(!S_ISREG(statbuf.st_mode) &&
!S_ISCHR(statbuf.st_mode) &&
!S_ISBLK(statbuf.st_mode))) {
(void) close(fd);
return;
}
#endif
/* this file is too small to hold a zpool */
if (S_ISREG(statbuf.st_mode) &&
statbuf.st_size < SPA_MINDEVSIZE) {
(void) close(fd);
return;
} else if (!S_ISREG(statbuf.st_mode)) {
/*
* Try to read the disk label first so we don't have to
* open a bunch of minor nodes that can't have a zpool.
*/
check_slices(rn->rn_avl, fd, rn->rn_name);
}
#ifdef __APPLE__
int32_t blksz = 0;
if (S_ISBLK(statbuf.st_mode) &&
(ioctl(fd, DKIOCGETBLOCKSIZE, &blksz) || blksz == 0)) {
if (strncmp(rn->rn_name, "vn", 2) != 0)
fprintf(stderr, "device '%s' failed to report blocksize -- skipping\r\n",
rn->rn_name);
close(fd);
return;
}
struct sigaction sact;
sigemptyset(&sact.sa_mask);
sact.sa_flags = 0;
sact.sa_handler = signal_alarm;
sigaction(SIGALRM, &sact, NULL);
if (setjmp(buffer) != 0) {
printf("ZFS: Warning, timeout reading device '%s'\n", rn->rn_name);
close(fd);
return;
}
alarm(20);
#endif
if ((zpool_read_label(fd, &config, &num_labels)) != 0) {
#ifdef __APPLE__
alarm(0);
#endif
(void) close(fd);
(void) no_memory(rn->rn_hdl);
return;
}
#ifdef __APPLE__
alarm(0);
#endif
if (num_labels == 0) {
(void) close(fd);
nvlist_free(config);
return;
}
(void) close(fd);
rn->rn_config = config;
rn->rn_num_labels = num_labels;
}
/*
* Given a list of directories to search, find all pools stored on disk. This
* includes partial pools which are not available to import. If no args are
* given (argc is 0), then the default directory (/dev/dsk) is searched.
* poolname or guid (but not both) are provided by the caller when trying
* to import a specific pool.
*/
static nvlist_t *
zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg)
{
int i, num_labels, dirs = iarg->paths;
DIR *dirp = NULL;
struct dirent *dp;
char path[MAXPATHLEN];
char *end, **dir = iarg->path;
size_t pathleft;
struct stat statbuf;
nvlist_t *ret = NULL, *config;
int fd;
pool_list_t pools = { 0 };
pool_entry_t *pe, *penext;
vdev_entry_t *ve, *venext;
config_entry_t *ce, *cenext;
name_entry_t *ne, *nenext;
verify(iarg->poolname == NULL || iarg->guid == 0);
if (dirs == 0) {
#ifdef HAVE_LIBBLKID
/* Use libblkid to scan all device for their type */
if (zpool_find_import_blkid(hdl, &pools) == 0)
goto skip_scanning;
(void) zfs_error_fmt(hdl, EZFS_BADCACHE,
dgettext(TEXT_DOMAIN, "blkid failure falling back "
"to manual probing"));
#endif /* HAVE_LIBBLKID */
dir = zpool_default_import_path;
dirs = DEFAULT_IMPORT_PATH_SIZE;
}
/*
* Go through and read the label configuration information from every
* possible device, organizing the information according to pool GUID
* and toplevel GUID.
*/
for (i = 0; i < dirs; i++) {
char *rdsk;
int dfd;
/* use realpath to normalize the path */
if (realpath(dir[i], path) == 0) {
/* it is safe to skip missing search paths */
if (errno == ENOENT)
continue;
zfs_error_aux(hdl, strerror(errno));
(void) zfs_error_fmt(hdl, EZFS_BADPATH,
dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]);
goto error;
}
end = &path[strlen(path)];
*end++ = '/';
*end = 0;
pathleft = &path[sizeof (path)] - end;
/*
* Using raw devices instead of block devices when we're
* reading the labels skips a bunch of slow operations during
* close(2) processing, so we replace /dev/dsk with /dev/rdsk.
*/
if (strcmp(path, "/dev/dsk/") == 0)
rdsk = "/dev/rdsk/";
else
rdsk = path;
if ((dfd = open(rdsk, O_RDONLY)) < 0 ||
(dirp = fdopendir(dfd)) == NULL) {
zfs_error_aux(hdl, strerror(errno));
(void) zfs_error_fmt(hdl, EZFS_BADPATH,
dgettext(TEXT_DOMAIN, "cannot open '%s'"),
rdsk);
goto error;
}
/*
* This is not MT-safe, but we have no MT consumers of libzfs
*/
while ((dp = readdir(dirp)) != NULL) {
const char *name = dp->d_name;
if (name[0] == '.' &&
(name[1] == 0 || (name[1] == '.' && name[2] == 0)))
continue;
/*
* Skip checking devices with well known prefixes:
* watchdog - A special close is required to avoid
* triggering it and resetting the system.
* fuse - Fuse control device.
* ppp - Generic PPP driver.
* tty* - Generic serial interface.
* vcs* - Virtual console memory.
* parport* - Parallel port interface.
* lp* - Printer interface.
* fd* - Floppy interface.
* hpet - High Precision Event Timer, crashes qemu
* when accessed from a virtual machine.
* core - Symlink to /proc/kcore, causes a crash
* when access from Xen dom0.
*/
if ((strncmp(name, "watchdog", 8) == 0) ||
(strncmp(name, "fuse", 4) == 0) ||
(strncmp(name, "ppp", 3) == 0) ||
(strncmp(name, "tty", 3) == 0) ||
(strncmp(name, "vcs", 3) == 0) ||
(strncmp(name, "parport", 7) == 0) ||
(strncmp(name, "lp", 2) == 0) ||
(strncmp(name, "fd", 2) == 0) ||
(strncmp(name, "hpet", 4) == 0) ||
#ifdef __APPLE__
(strncmp(name, "pty", 3) == 0) || // lots, skip for speed
(strncmp(name, "com", 3) == 0) || // /dev/com_digidesign_semiface
#endif
(strncmp(name, "core", 4) == 0))
continue;
/*
* Ignore failed stats. We only want regular
* files and block devices.
*/
if ((fstatat64(dfd, name, &statbuf, 0) != 0) ||
(!S_ISREG(statbuf.st_mode) &&
!S_ISBLK(statbuf.st_mode)))
continue;
#ifdef __APPLE__
/* It is desirable to skip optical media as well, as they are
* also called /dev/diskX
*/
if (is_optical_media((char *)name))
continue;
#endif
if ((fd = openat64(dfd, name, O_RDONLY)) < 0)
continue;
int32_t blksz = 0;
if (S_ISBLK(statbuf.st_mode) &&
(ioctl(fd, DKIOCGETBLOCKSIZE, &blksz) || blksz == 0)) {
if (strncmp(name, "vn", 2) != 0)
fprintf(stderr, "device '%s' failed to report blocksize -- skipping\r\n",
name);
close(fd);
continue;
}
#ifdef __APPLE__
struct sigaction sact;
sigemptyset(&sact.sa_mask);
sact.sa_flags = 0;
sact.sa_handler = signal_alarm;
sigaction(SIGALRM, &sact, NULL);
if (setjmp(buffer) != 0) {
printf("ZFS: Warning, timeout reading device '%s'\n", name);
close(fd);
continue;
}
alarm(20);
#endif
if ((zpool_read_label(fd, &config, NULL)) != 0) {
#ifdef __APPLE__
alarm(0);
#endif
(void) close(fd);
(void) no_memory(hdl);
goto error;
}
#ifdef __APPLE__
alarm(0);
#endif
(void) close(fd);
if (config != NULL) {
boolean_t matched = B_TRUE;
char *pname;
if ((iarg->poolname != NULL) &&
(nvlist_lookup_string(config,
ZPOOL_CONFIG_POOL_NAME, &pname) == 0)) {
if (strcmp(iarg->poolname, pname))
matched = B_FALSE;
} else if (iarg->guid != 0) {
uint64_t this_guid;
matched = nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_GUID,
&this_guid) == 0 &&
iarg->guid == this_guid;
}
if (!matched) {
nvlist_free(config);
config = NULL;
continue;
}
/* use the non-raw path for the config */
(void) strlcpy(end, name, pathleft);
if (add_config(hdl, &pools, path, i+1,
num_labels, config))
goto error;
}
}
(void) closedir(dirp);
dirp = NULL;
}
#ifdef HAVE_LIBBLKID
skip_scanning:
#endif
ret = get_configs(hdl, &pools, iarg->can_be_active);
error:
for (pe = pools.pools; pe != NULL; pe = penext) {
penext = pe->pe_next;
for (ve = pe->pe_vdevs; ve != NULL; ve = venext) {
venext = ve->ve_next;
for (ce = ve->ve_configs; ce != NULL; ce = cenext) {
cenext = ce->ce_next;
if (ce->ce_config)
nvlist_free(ce->ce_config);
free(ce);
}
free(ve);
}
free(pe);
}
for (ne = pools.names; ne != NULL; ne = nenext) {
nenext = ne->ne_next;
if (ne->ne_name)
free(ne->ne_name);
free(ne);
}
if (dirp)
(void) closedir(dirp);
return (ret);
}
