int main(void)
{
fopen("", "r");
fopen64("", "r");
freopen("", "r", NULL);
freopen64("", "r", NULL);
open("", O_RDONLY);
open64("", O_RDONLY);
creat("", S_IRWXU);
creat64("", S_IRWXU);
unlink("");
rename("", "");
#ifdef AT_FUNCTIONS
unlinkat(0, "", 0);
renameat(0, "", 0, "");
openat(0, "", 0);
openat64(0, "", 0);
#endif
return 0;
}
TEST(fcntl, openat_openat64) {
int fd;
fd = openat(AT_FDCWD, "/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
fd = openat64(AT_FDCWD, "/proc/version", O_RDONLY);
ASSERT_TRUE(fd != -1);
close(fd);
}
/* Error-checking wrapper for the openat64 function, compatible with the
wrapper_func type. */
static int
wrap_openat64 (const char *path, int flags, mode_t mode)
{
int ret = openat64 (AT_FDCWD, path, flags, mode);
if (ret < 0)
{
printf ("error: openat64 (\"%s\", 0x%x, 0%03o): %m\n", path, flags, mode);
exit (1);
}
return ret;
}
static void
zpool_open_func(void *arg)
{
rdsk_node_t *rn = arg;
struct stat64 statbuf;
nvlist_t *config;
int fd;
if (rn->rn_nozpool)
return;
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;
}
/* 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);
}
if ((zpool_read_label(fd, &config)) != 0) {
(void) close(fd);
(void) no_memory(rn->rn_hdl);
return;
}
(void) close(fd);
rn->rn_config = config;
if (config != NULL) {
assert(rn->rn_nozpool == B_FALSE);
}
}
int
vn_openat(char *path, enum uio_seg x1, int flags, int mode,
vnode_t **vpp, enum create x2, mode_t x3, vnode_t *startvp,
int pfd)
{
int save_errno, fd, stflags = 0;
mode_t old_umask;
struct stat64 st;
if (flags & FNOFOLLOW)
stflags |= AT_SYMLINK_NOFOLLOW;
if (!(flags & FCREAT) && fstatat64(pfd, path, &st, stflags) == -1)
return (errno);
if (flags & FCREAT)
old_umask = umask(0);
if (!(flags & FCREAT) && S_ISBLK(st.st_mode)) {
flags |= O_DIRECT;
if (flags & FWRITE)
flags |= O_EXCL;
}
/*
* The construct 'flags - FREAD' conveniently maps combinations of
* FREAD and FWRITE to the corresponding O_RDONLY, O_WRONLY, and O_RDWR.
*/
fd = openat64(pfd, path, flags - FREAD, mode);
save_errno = errno;
if (flags & FCREAT)
umask(old_umask);
if (fd == -1)
return (save_errno);
/* isfromfd */
return (vn_fromfd(fd, path, flags, vpp, startvp != rootdir));
}
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;
}
int
do_test (int argc, char *argv[])
{
int ret, fd2;
struct stat64 statbuf;
ret = lseek64 (fd, TWO_GB+100, SEEK_SET);
if (ret == -1 && errno == ENOSYS)
{
error (0, 0, "lseek64 is not supported.");
exit (EXIT_SUCCESS);
}
if (ret == -1 && errno == EINVAL)
{
error (0, 0, "LFS seems not to be supported.");
exit (EXIT_SUCCESS);
}
if (ret == -1)
{
error (0, errno, "lseek64 failed with error");
exit (EXIT_FAILURE);
}
ret = write (fd, "Hello", 5);
if (ret == -1 && errno == EFBIG)
{
error (0, 0, "LFS seems not to be supported.");
exit (EXIT_SUCCESS);
}
if (ret == -1 && errno == ENOSPC)
{
error (0, 0, "Not enough space to write file.");
exit (EXIT_SUCCESS);
}
if (ret != 5)
error (EXIT_FAILURE, errno, "cannot write test string to large file");
ret = close (fd);
if (ret == -1)
error (EXIT_FAILURE, errno, "error closing file");
ret = stat64 (name, &statbuf);
if (ret == -1 && (errno == ENOSYS || errno == EOVERFLOW))
error (0, 0, "stat64 is not supported.");
else if (ret == -1)
error (EXIT_FAILURE, errno, "cannot stat file `%s'", name);
else if (statbuf.st_size != (TWO_GB + 100 + 5))
error (EXIT_FAILURE, 0, "stat reported size %lld instead of %lld.",
(long long int) statbuf.st_size, (TWO_GB + 100 + 5));
fd2 = openat64 (AT_FDCWD, name, O_RDWR);
if (fd2 == -1)
{
if (errno == ENOSYS)
{
/* Silently ignore this test. */
error (0, 0, "openat64 is not supported");
}
else
error (EXIT_FAILURE, errno, "openat64 failed to open big file");
}
else
{
ret = close (fd2);
if (ret == -1)
error (EXIT_FAILURE, errno, "error closing file");
}
test_ftello ();
return 0;
}
/*
* 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);
}
static void
zpool_open_func(void *arg)
{
rdsk_node_t *rn = arg;
struct stat64 statbuf;
nvlist_t *config;
int num_labels;
int fd;
if (rn->rn_nozpool)
return;
#ifdef __linux__
/*
* 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) ||
(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;
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
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);
}
if ((zpool_read_label(fd, &config, &num_labels)) != 0) {
(void) close(fd);
(void) no_memory(rn->rn_hdl);
return;
}
if (num_labels == 0) {
(void) close(fd);
nvlist_free(config);
return;
}
(void) close(fd);
rn->rn_config = config;
rn->rn_num_labels = num_labels;
}
int
main(int argc, char *argv[])
{
int fd;
int dirfd;
int i;
int argslen;
char *shell;
char *args[4];
char *cmdargs;
if (argc < 2) {
usage();
exit(127);
}
if ((fd = open64(argv[1], O_RDONLY)) == -1) {
(void) fprintf(stderr,
gettext("runat: cannot open %s: %s\n"), argv[1],
strerror(errno));
exit(125);
}
if ((dirfd = openat64(fd, ".", O_RDONLY|O_XATTR)) == -1) {
(void) fprintf(stderr,
gettext("runat: cannot open attribute"
" directory for %s: %s\n"), argv[1], strerror(errno));
exit(125);
}
(void) close(fd);
if (fchdir(dirfd) == -1) {
(void) fprintf(stderr,
gettext("runat: cannot fchdir to attribute"
" directory: %s\n"), strerror(errno));
exit(125);
}
if (argc < 3) {
shell = getenv("SHELL");
if (shell == NULL) {
(void) fprintf(stderr,
gettext(
"runat: shell not found, using /bin/sh\n"));
shell = "/bin/sh";
}
(void) execl(shell, shell, NULL);
(void) fprintf(stderr,
gettext("runat: Failed to exec %s: %s\n"), shell,
strerror(errno));
return (126);
}
/*
* Count up the size of all of the args
*/
for (i = 2, argslen = 0; i < argc; i++) {
argslen += strlen(argv[i]) + 1;
}
cmdargs = calloc(1, argslen);
if (cmdargs == NULL) {
(void) fprintf(stderr, gettext(
"runat: failed to allocate memory for"
" command arguments: %s\n"), strerror(errno));
exit(126);
}
/*
* create string with all of the args concatenated together
* This is done so that the shell will interpret the args
* and do globbing if necessary.
*/
for (i = 2; i < argc; i++) {
if (strlcat(cmdargs, argv[i], argslen) >= argslen) {
(void) fprintf(stderr, gettext(
"runat: arguments won't fit in"
" allocated buffer\n"));
exit(126);
}
/*
* tack on a space if there are more args
*/
if ((i + 1) < argc) {
if (strlcat(cmdargs, " ", argslen) >= argslen) {
(void) fprintf(stderr, gettext(
"runat: arguments won't fit in"
" allocated buffer\n"));
exit(126);
}
}
}
args[0] = "/bin/sh";
args[1] = "-c";
args[2] = cmdargs;
args[3] = NULL;
(void) execvp(args[0], args);
(void) fprintf(stderr, gettext("runat: Failed to exec %s: %s\n"),
argv[0], strerror(errno));
return (126);
}
/*
* 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, dirs = iarg->paths;
DIR *dirp = NULL;
struct dirent64 *dp;
char path[MAXPATHLEN];
char *end, **dir = iarg->path;
size_t pathleft;
struct stat64 statbuf;
nvlist_t *ret = NULL, *config;
static char *default_dir = DISK_ROOT;
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 */
dirs = 1;
dir = &default_dir;
}
/*
* 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) {
(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 = open64(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 = readdir64(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) ||
(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;
if ((fd = openat64(dfd, name, O_RDONLY)) < 0)
continue;
if ((zpool_read_label(fd, &config)) != 0) {
(void) close(fd);
(void) no_memory(hdl);
goto error;
}
(void) close(fd);
if (config != NULL) {
boolean_t matched = B_TRUE;
if (iarg->poolname != NULL) {
char *pname;
matched = nvlist_lookup_string(config,
ZPOOL_CONFIG_POOL_NAME,
&pname) == 0 &&
strcmp(iarg->poolname, pname) == 0;
} 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, config) != 0)
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);
}
int
open64(char *path, int fmode, int cmode)
{
return (openat64(AT_FDCWD, path, fmode, cmode));
}
