1 /* vi: set sw=4 ts=4: */
3 * Mini mount implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 /* Design notes: There is no spec for mount. Remind me to write one.
14 mount_main() calls singlemount() which calls mount_it_now().
16 mount_main() can loop through /etc/fstab for mount -a
17 singlemount() can loop through /etc/filesystems for fstype detection.
18 mount_it_now() does the actual mount.
25 #if ENABLE_FEATURE_MOUNT_LABEL
26 #include "volume_id.h"
29 /* Needed for nfs support only */
30 #include <sys/utsname.h>
34 #include <rpc/pmap_prot.h>
35 #include <rpc/pmap_clnt.h>
38 #define MS_SILENT (1 << 15)
40 /* Grab more as needed from util-linux's mount/mount_constants.h */
42 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
46 #if defined(__dietlibc__)
47 /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
48 * dietlibc-0.30 does not have implementation of getmntent_r() */
49 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
50 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
52 struct mntent* ment = getmntent(stream);
53 return memcpy(result, ment, sizeof(*ment));
58 // Not real flags, but we want to be able to check for this.
60 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
61 MOUNT_NOAUTO = (1 << 29),
62 MOUNT_SWAP = (1 << 30),
66 #define OPTION_STR "o:t:rwanfvsi"
80 #if ENABLE_FEATURE_MTAB_SUPPORT
81 #define useMtab (!(option_mask32 & OPT_n))
86 #if ENABLE_FEATURE_MOUNT_FAKE
87 #define fakeIt (option_mask32 & OPT_f)
93 // TODO: more "user" flag compatibility.
94 // "user" option (from mount manpage):
95 // Only the user that mounted a filesystem can unmount it again.
96 // If any user should be able to unmount, then use users instead of user
97 // in the fstab line. The owner option is similar to the user option,
98 // with the restriction that the user must be the owner of the special file.
99 // This may be useful e.g. for /dev/fd if a login script makes
100 // the console user owner of this device.
102 /* Standard mount options (from -o options or --options), with corresponding
105 static const int32_t mount_options[] = {
106 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
108 USE_FEATURE_MOUNT_LOOP(
112 USE_FEATURE_MOUNT_FSTAB(
114 /* "quiet" 0 - do not filter out, vfat wants to see it */
115 /* "noauto" */ MOUNT_NOAUTO,
116 /* "sw" */ MOUNT_SWAP,
117 /* "swap" */ MOUNT_SWAP,
118 USE_DESKTOP(/* "user" */ MOUNT_USERS,)
119 USE_DESKTOP(/* "users" */ MOUNT_USERS,)
123 USE_FEATURE_MOUNT_FLAGS(
125 /* "nosuid" */ MS_NOSUID,
126 /* "suid" */ ~MS_NOSUID,
127 /* "dev" */ ~MS_NODEV,
128 /* "nodev" */ MS_NODEV,
129 /* "exec" */ ~MS_NOEXEC,
130 /* "noexec" */ MS_NOEXEC,
131 /* "sync" */ MS_SYNCHRONOUS,
132 /* "dirsync" */ MS_DIRSYNC,
133 /* "async" */ ~MS_SYNCHRONOUS,
134 /* "atime" */ ~MS_NOATIME,
135 /* "noatime" */ MS_NOATIME,
136 /* "diratime" */ ~MS_NODIRATIME,
137 /* "nodiratime" */ MS_NODIRATIME,
138 /* "mand" */ MS_MANDLOCK,
139 /* "nomand" */ ~MS_MANDLOCK,
140 /* "loud" */ ~MS_SILENT,
143 /* "bind" */ MS_BIND,
144 /* "move" */ MS_MOVE,
145 /* "shared" */ MS_SHARED,
146 /* "slave" */ MS_SLAVE,
147 /* "private" */ MS_PRIVATE,
148 /* "unbindable" */ MS_UNBINDABLE,
149 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
150 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
151 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
152 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
155 // Always understood.
156 /* "ro" */ MS_RDONLY, // vfs flag
157 /* "rw" */ ~MS_RDONLY, // vfs flag
158 /* "remount" */ MS_REMOUNT // action flag
161 static const char mount_option_str[] =
162 USE_FEATURE_MOUNT_LOOP(
165 USE_FEATURE_MOUNT_FSTAB(
167 /* "quiet" "\0" - do not filter out, vfat wants to see it */
171 USE_DESKTOP("user" "\0")
172 USE_DESKTOP("users" "\0")
175 USE_FEATURE_MOUNT_FLAGS(
207 // Always understood.
208 "ro" "\0" // vfs flag
209 "rw" "\0" // vfs flag
210 "remount" "\0" // action flag
215 #if ENABLE_FEATURE_MOUNT_NFS
216 smalluint nfs_mount_version;
218 #if ENABLE_FEATURE_MOUNT_VERBOSE
222 char getmntent_buf[1];
225 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
226 #define G (*(struct globals*)&bb_common_bufsiz1)
227 #define nfs_mount_version (G.nfs_mount_version)
228 #if ENABLE_FEATURE_MOUNT_VERBOSE
229 #define verbose (G.verbose )
233 #define fslist (G.fslist )
234 #define getmntent_buf (G.getmntent_buf )
237 #if ENABLE_FEATURE_MOUNT_VERBOSE
238 static int verbose_mount(const char *source, const char *target,
239 const char *filesystemtype,
240 unsigned long mountflags, const void *data)
245 rc = mount(source, target, filesystemtype, mountflags, data);
247 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
248 source, target, filesystemtype,
249 mountflags, (char*)data, rc);
253 #define verbose_mount(...) mount(__VA_ARGS__)
256 static int resolve_mount_spec(char **fsname)
260 #if ENABLE_FEATURE_MOUNT_LABEL
261 if (!strncmp(*fsname, "UUID=", 5))
262 tmp = get_devname_from_uuid(*fsname + 5);
263 else if (!strncmp(*fsname, "LABEL=", 6))
264 tmp = get_devname_from_label(*fsname + 6);
274 /* Append mount options to string */
275 static void append_mount_options(char **oldopts, const char *newopts)
277 if (*oldopts && **oldopts) {
278 /* do not insert options which are already there */
281 int len = strlen(newopts);
282 p = strchr(newopts, ',');
283 if (p) len = p - newopts;
286 if (!strncmp(p, newopts, len)
287 && (p[len] == ',' || p[len] == '\0'))
293 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
298 while (newopts[0] == ',') newopts++;
301 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
302 *oldopts = xstrdup(newopts);
306 /* Use the mount_options list to parse options into flags.
307 * Also return list of unrecognized options if unrecognized!=NULL */
308 static long parse_mount_options(char *options, char **unrecognized)
310 long flags = MS_SILENT;
312 // Loop through options
315 char *comma = strchr(options, ',');
316 const char *option_str = mount_option_str;
318 if (comma) *comma = '\0';
320 /* FIXME: use hasmntopt() */
321 // Find this option in mount_options
322 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
323 if (!strcasecmp(option_str, options)) {
324 long fl = mount_options[i];
325 if (fl < 0) flags &= fl;
329 option_str += strlen(option_str) + 1;
331 // If unrecognized not NULL, append unrecognized mount options */
332 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
333 // Add it to strflags, to pass on to kernel
334 i = *unrecognized ? strlen(*unrecognized) : 0;
335 *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2);
337 // Comma separated if it's not the first one
338 if (i) (*unrecognized)[i++] = ',';
339 strcpy((*unrecognized)+i, options);
344 // Advance to next option
352 // Return a list of all block device backed filesystems
354 static llist_t *get_block_backed_filesystems(void)
356 static const char filesystems[2][sizeof("/proc/filesystems")] = {
365 for (i = 0; i < 2; i++) {
366 f = fopen(filesystems[i], "r");
369 while ((buf = xmalloc_fgetline(f)) != NULL) {
370 if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
372 fs = skip_whitespace(buf);
373 if (*fs=='#' || *fs=='*' || !*fs) continue;
375 llist_add_to_end(&list, xstrdup(fs));
378 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
384 #if ENABLE_FEATURE_CLEAN_UP
385 static void delete_block_backed_filesystems(void)
387 llist_free(fslist, free);
390 void delete_block_backed_filesystems(void);
393 // Perform actual mount of specific filesystem at specific location.
394 // NB: mp->xxx fields may be trashed on exit
395 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
401 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
402 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
403 vfsflags, filteropts);
407 // Mount, with fallback to read-only if necessary.
410 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
411 vfsflags, filteropts);
413 // If mount failed, try
414 // helper program mount.<mnt_type>
415 if (ENABLE_FEATURE_MOUNT_HELPERS && rc) {
417 int errno_save = errno;
418 args[0] = xasprintf("mount.%s", mp->mnt_type);
421 args[rc++] = (char *)"-o";
422 args[rc++] = filteropts;
424 args[rc++] = mp->mnt_fsname;
425 args[rc++] = mp->mnt_dir;
427 rc = wait4pid(spawn(args));
434 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
436 if (!(vfsflags & MS_SILENT))
437 bb_error_msg("%s is write-protected, mounting read-only",
439 vfsflags |= MS_RDONLY;
442 // Abort entirely if permission denied.
444 if (rc && errno == EPERM)
445 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
447 /* If the mount was successful, and we're maintaining an old-style
448 * mtab file by hand, add the new entry to it now. */
450 if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
452 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
453 const char *option_str = mount_option_str;
457 bb_error_msg("no %s", bb_path_mtab_file);
461 // Add vfs string flags
463 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
464 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
465 append_mount_options(&(mp->mnt_opts), option_str);
466 option_str += strlen(option_str) + 1;
469 // Remove trailing / (if any) from directory we mounted on
471 i = strlen(mp->mnt_dir) - 1;
472 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
474 // Convert to canonical pathnames as needed
476 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
478 if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
479 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
480 mp->mnt_type = (char*)"bind";
482 mp->mnt_freq = mp->mnt_passno = 0;
486 addmntent(mountTable, mp);
487 endmntent(mountTable);
488 if (ENABLE_FEATURE_CLEAN_UP) {
497 #if ENABLE_FEATURE_MOUNT_NFS
501 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
503 * Licensed under GPLv2, see file LICENSE in this tarball for details.
505 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
506 * numbers to be specified on the command line.
508 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
509 * Omit the call to connect() for Linux version 1.3.11 or later.
511 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
512 * Implemented the "bg", "fg" and "retry" mount options for NFS.
514 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
515 * - added Native Language Support
517 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
521 /* This is just a warning of a common mistake. Possibly this should be a
522 * uclibc faq entry rather than in busybox... */
523 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
524 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
527 #define MOUNTPORT 635
528 #define MNTPATHLEN 1024
529 #define MNTNAMLEN 255
533 typedef char fhandle[FHSIZE];
536 unsigned int fhandle3_len;
548 MNT3ERR_NAMETOOLONG = 63,
549 MNT3ERR_NOTSUPP = 10004,
550 MNT3ERR_SERVERFAULT = 10006,
552 typedef enum mountstat3 mountstat3;
555 unsigned int fhs_status;
560 typedef struct fhstatus fhstatus;
562 struct mountres3_ok {
565 unsigned int auth_flavours_len;
566 char *auth_flavours_val;
569 typedef struct mountres3_ok mountres3_ok;
572 mountstat3 fhs_status;
574 mountres3_ok mountinfo;
577 typedef struct mountres3 mountres3;
579 typedef char *dirpath;
583 typedef struct mountbody *mountlist;
587 dirpath ml_directory;
590 typedef struct mountbody mountbody;
592 typedef struct groupnode *groups;
598 typedef struct groupnode groupnode;
600 typedef struct exportnode *exports;
607 typedef struct exportnode exportnode;
620 typedef struct ppathcnf ppathcnf;
622 #define MOUNTPROG 100005
625 #define MOUNTPROC_NULL 0
626 #define MOUNTPROC_MNT 1
627 #define MOUNTPROC_DUMP 2
628 #define MOUNTPROC_UMNT 3
629 #define MOUNTPROC_UMNTALL 4
630 #define MOUNTPROC_EXPORT 5
631 #define MOUNTPROC_EXPORTALL 6
633 #define MOUNTVERS_POSIX 2
635 #define MOUNTPROC_PATHCONF 7
639 #define MOUNTPROC3_NULL 0
640 #define MOUNTPROC3_MNT 1
641 #define MOUNTPROC3_DUMP 2
642 #define MOUNTPROC3_UMNT 3
643 #define MOUNTPROC3_UMNTALL 4
644 #define MOUNTPROC3_EXPORT 5
656 * We want to be able to compile mount on old kernels in such a way
657 * that the binary will work well on more recent kernels.
658 * Thus, if necessary we teach nfsmount.c the structure of new fields
659 * that will come later.
661 * Moreover, the new kernel includes conflict with glibc includes
662 * so it is easiest to ignore the kernel altogether (at compile time).
670 unsigned char data[64];
673 struct nfs_mount_data {
676 struct nfs2_fh old_root; /* 1 */
682 int acregmin; /* 1 */
683 int acregmax; /* 1 */
684 int acdirmin; /* 1 */
685 int acdirmax; /* 1 */
686 struct sockaddr_in addr; /* 1 */
687 char hostname[256]; /* 1 */
689 unsigned int bsize; /* 3 */
690 struct nfs3_fh root; /* 4 */
693 /* bits in the flags field */
695 NFS_MOUNT_SOFT = 0x0001, /* 1 */
696 NFS_MOUNT_INTR = 0x0002, /* 1 */
697 NFS_MOUNT_SECURE = 0x0004, /* 1 */
698 NFS_MOUNT_POSIX = 0x0008, /* 1 */
699 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
700 NFS_MOUNT_NOAC = 0x0020, /* 1 */
701 NFS_MOUNT_TCP = 0x0040, /* 2 */
702 NFS_MOUNT_VER3 = 0x0080, /* 3 */
703 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
704 NFS_MOUNT_NONLM = 0x0200 /* 3 */
709 * We need to translate between nfs status return values and
710 * the local errno values which may not be the same.
712 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
713 * "after #include <errno.h> the symbol errno is reserved for any use,
714 * it cannot even be used as a struct tag or field name".
718 #define EDQUOT ENOSPC
721 // Convert each NFSERR_BLAH into EBLAH
723 static const struct {
727 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
728 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
729 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
730 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
733 static char *nfs_strerror(int status)
737 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
738 if (nfs_errtbl[i].stat == status)
739 return strerror(nfs_errtbl[i].errnum);
741 return xasprintf("unknown nfs status return value: %d", status);
744 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
746 if (!xdr_opaque(xdrs, objp, FHSIZE))
751 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
753 if (!xdr_u_int(xdrs, &objp->fhs_status))
755 switch (objp->fhs_status) {
757 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
766 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
768 if (!xdr_string(xdrs, objp, MNTPATHLEN))
773 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
775 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
780 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
782 if (!xdr_fhandle3(xdrs, &objp->fhandle))
784 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
785 sizeof (int), (xdrproc_t) xdr_int))
790 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
792 if (!xdr_enum(xdrs, (enum_t *) objp))
797 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
799 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
801 switch (objp->fhs_status) {
803 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
812 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
815 * Unfortunately, the kernel prints annoying console messages
816 * in case of an unexpected nfs mount version (instead of
817 * just returning some error). Therefore we'll have to try
818 * and figure out what version the kernel expects.
821 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
822 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
823 * nfs_mount_version: version this source and running kernel can handle
826 find_kernel_nfs_mount_version(void)
830 if (nfs_mount_version)
833 nfs_mount_version = 4; /* default */
835 kernel_version = get_linux_version_code();
836 if (kernel_version) {
837 if (kernel_version < KERNEL_VERSION(2,1,32))
838 nfs_mount_version = 1;
839 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
840 (kernel_version >= KERNEL_VERSION(2,3,0) &&
841 kernel_version < KERNEL_VERSION(2,3,99)))
842 nfs_mount_version = 3;
843 /* else v4 since 2.3.99pre4 */
848 get_mountport(struct pmap *pm_mnt,
849 struct sockaddr_in *server_addr,
851 long unsigned version,
855 struct pmaplist *pmap;
857 server_addr->sin_port = PMAPPORT;
858 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
859 * I understand it like "IPv6 for this is not 100% ready" */
860 pmap = pmap_getmaps(server_addr);
862 if (version > MAX_NFSPROT)
863 version = MAX_NFSPROT;
866 pm_mnt->pm_prog = prog;
867 pm_mnt->pm_vers = version;
868 pm_mnt->pm_prot = proto;
869 pm_mnt->pm_port = port;
872 if (pmap->pml_map.pm_prog != prog)
874 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
876 if (version > 2 && pmap->pml_map.pm_vers != version)
878 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
880 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
881 (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) ||
882 (port && pmap->pml_map.pm_port != port))
884 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
886 pmap = pmap->pml_next;
888 if (!pm_mnt->pm_vers)
889 pm_mnt->pm_vers = MOUNTVERS;
890 if (!pm_mnt->pm_port)
891 pm_mnt->pm_port = MOUNTPORT;
892 if (!pm_mnt->pm_prot)
893 pm_mnt->pm_prot = IPPROTO_TCP;
897 static int daemonize(void)
901 if (pid < 0) /* error */
903 if (pid > 0) /* parent */
906 fd = xopen(bb_dev_null, O_RDWR);
910 while (fd > 2) close(fd--);
912 openlog(applet_name, LOG_PID, LOG_DAEMON);
913 logmode = LOGMODE_SYSLOG;
917 static inline int daemonize(void) { return -ENOSYS; }
921 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
926 /* RPC strerror analogs are terminally idiotic:
927 * *mandatory* prefix and \n at end.
928 * This hopefully helps. Usage:
929 * error_msg_rpc(clnt_*error*(" ")) */
930 static void error_msg_rpc(const char *msg)
933 while (msg[0] == ' ' || msg[0] == ':') msg++;
935 while (len && msg[len-1] == '\n') len--;
936 bb_error_msg("%.*s", len, msg);
939 // NB: mp->xxx fields may be trashed on exit
940 static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
946 struct nfs_mount_data data;
949 struct sockaddr_in server_addr;
950 struct sockaddr_in mount_server_addr;
953 struct fhstatus nfsv2;
954 struct mountres3 nfsv3;
980 find_kernel_nfs_mount_version();
988 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
990 filteropts = xstrdup(filteropts); /* going to trash it later... */
992 hostname = xstrdup(mp->mnt_fsname);
993 /* mount_main() guarantees that ':' is there */
994 s = strchr(hostname, ':');
997 /* Ignore all but first hostname in replicated mounts
998 until they can be fully supported. (mack@sgi.com) */
999 s = strchr(hostname, ',');
1002 bb_error_msg("warning: multiple hostnames not supported");
1005 server_addr.sin_family = AF_INET;
1006 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1007 hp = gethostbyname(hostname);
1009 bb_herror_msg("%s", hostname);
1012 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1013 bb_error_msg("got bad hp->h_length");
1014 hp->h_length = sizeof(struct in_addr);
1016 memcpy(&server_addr.sin_addr,
1017 hp->h_addr, hp->h_length);
1020 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1022 /* add IP address to mtab options for use when unmounting */
1024 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1025 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1027 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1028 mp->mnt_opts[0] ? "," : "",
1029 inet_ntoa(server_addr.sin_addr));
1034 /* Set default options.
1035 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1036 * let the kernel decide.
1037 * timeo is filled in after we know whether it'll be TCP or UDP. */
1038 memset(&data, 0, sizeof(data));
1044 data.namlen = NAME_MAX;
1052 retry = 10000; /* 10000 minutes ~ 1 week */
1055 mountprog = MOUNTPROG;
1063 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1064 char *opteq = strchr(opt, '=');
1067 static const char options[] ALIGN1 =
1072 /* 4 */ "acregmin\0"
1073 /* 5 */ "acregmax\0"
1074 /* 6 */ "acdirmin\0"
1075 /* 7 */ "acdirmax\0"
1079 /* 11 */ "mountport\0"
1080 /* 12 */ "mounthost\0"
1081 /* 13 */ "mountprog\0"
1082 /* 14 */ "mountvers\0"
1083 /* 15 */ "nfsprog\0"
1084 /* 16 */ "nfsvers\0"
1091 idx = index_in_strings(options, opt);
1093 case 12: // "mounthost"
1094 mounthost = xstrndup(opteq,
1095 strcspn(opteq, " \t\n\r,"));
1098 if (!strncmp(opteq, "tcp", 3))
1100 else if (!strncmp(opteq, "udp", 3))
1103 bb_error_msg("warning: unrecognized proto= option");
1105 case 20: // "addr" - ignore
1109 val = xatoi_u(opteq);
1120 case 3: // "retrans"
1123 case 4: // "acregmin"
1124 data.acregmin = val;
1126 case 5: // "acregmax"
1127 data.acregmax = val;
1129 case 6: // "acdirmin"
1130 data.acdirmin = val;
1132 case 7: // "acdirmax"
1133 data.acdirmax = val;
1135 case 8: // "actimeo"
1136 data.acregmin = val;
1137 data.acregmax = val;
1138 data.acdirmin = val;
1139 data.acdirmax = val;
1147 case 11: // "mountport"
1150 case 13: // "mountprog"
1153 case 14: // "mountvers"
1156 case 15: // "nfsprog"
1159 case 16: // "nfsvers"
1163 case 19: // "namlen"
1164 //if (nfs_mount_version >= 2)
1167 // bb_error_msg("warning: option namlen is not supported\n");
1170 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1174 else { /* not of the form opt=val */
1175 static const char options[] ALIGN1 =
1188 if (!strncmp(opt, "no", 2)) {
1192 switch (index_in_strings(options, opt)) {
1228 if (nfs_mount_version >= 3)
1231 bb_error_msg("warning: option nolock is not supported");
1234 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1239 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1241 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1242 | (intr ? NFS_MOUNT_INTR : 0)
1243 | (posix ? NFS_MOUNT_POSIX : 0)
1244 | (nocto ? NFS_MOUNT_NOCTO : 0)
1245 | (noac ? NFS_MOUNT_NOAC : 0);
1246 if (nfs_mount_version >= 2)
1247 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1248 if (nfs_mount_version >= 3)
1249 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1250 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1251 bb_error_msg("NFSv%d not supported", nfsvers);
1254 if (nfsvers && !mountvers)
1255 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1256 if (nfsvers && nfsvers < mountvers) {
1257 mountvers = nfsvers;
1260 /* Adjust options if none specified */
1262 data.timeo = tcp ? 70 : 7;
1264 data.version = nfs_mount_version;
1266 if (vfsflags & MS_REMOUNT)
1270 * If the previous mount operation on the same host was
1271 * backgrounded, and the "bg" for this mount is also set,
1272 * give up immediately, to avoid the initial timeout.
1274 if (bg && we_saw_this_host_before(hostname)) {
1275 daemonized = daemonize();
1276 if (daemonized <= 0) { /* parent or error */
1277 retval = -daemonized;
1282 /* create mount daemon client */
1283 /* See if the nfs host = mount host. */
1285 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1286 mount_server_addr.sin_family = AF_INET;
1287 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1289 hp = gethostbyname(mounthost);
1291 bb_herror_msg("%s", mounthost);
1294 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1295 bb_error_msg("got bad hp->h_length");
1296 hp->h_length = sizeof(struct in_addr);
1298 mount_server_addr.sin_family = AF_INET;
1299 memcpy(&mount_server_addr.sin_addr,
1300 hp->h_addr, hp->h_length);
1305 * The following loop implements the mount retries. When the mount
1306 * times out, and the "bg" option is set, we background ourself
1307 * and continue trying.
1309 * The case where the mount point is not present and the "bg"
1310 * option is set, is treated as a timeout. This is done to
1311 * support nested mounts.
1313 * The "retry" count specified by the user is the number of
1314 * minutes to retry before giving up.
1317 struct timeval total_timeout;
1318 struct timeval retry_timeout;
1324 retry_timeout.tv_sec = 3;
1325 retry_timeout.tv_usec = 0;
1326 total_timeout.tv_sec = 20;
1327 total_timeout.tv_usec = 0;
1328 timeout = time(NULL) + 60 * retry;
1332 /* be careful not to use too many CPU cycles */
1336 get_mountport(&pm_mnt, &mount_server_addr,
1341 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1343 /* contact the mount daemon via TCP */
1344 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1345 msock = RPC_ANYSOCK;
1347 switch (pm_mnt.pm_prot) {
1349 mclient = clntudp_create(&mount_server_addr,
1356 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1357 msock = RPC_ANYSOCK;
1359 mclient = clnttcp_create(&mount_server_addr,
1368 if (!daemonized && prevt == 0)
1369 error_msg_rpc(clnt_spcreateerror(" "));
1371 enum clnt_stat clnt_stat;
1372 /* try to mount hostname:pathname */
1373 mclient->cl_auth = authunix_create_default();
1375 /* make pointers in xdr_mountres3 NULL so
1376 * that xdr_array allocates memory for us
1378 memset(&status, 0, sizeof(status));
1380 if (pm_mnt.pm_vers == 3)
1381 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1382 (xdrproc_t) xdr_dirpath,
1383 (caddr_t) &pathname,
1384 (xdrproc_t) xdr_mountres3,
1388 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1389 (xdrproc_t) xdr_dirpath,
1390 (caddr_t) &pathname,
1391 (xdrproc_t) xdr_fhstatus,
1395 if (clnt_stat == RPC_SUCCESS)
1396 goto prepare_kernel_data; /* we're done */
1397 if (errno != ECONNREFUSED) {
1398 error_msg_rpc(clnt_sperror(mclient, " "));
1399 goto fail; /* don't retry */
1401 /* Connection refused */
1402 if (!daemonized && prevt == 0) /* print just once */
1403 error_msg_rpc(clnt_sperror(mclient, " "));
1404 auth_destroy(mclient->cl_auth);
1405 clnt_destroy(mclient);
1411 /* Timeout. We are going to retry... maybe */
1416 daemonized = daemonize();
1417 if (daemonized <= 0) { /* parent or error */
1418 retval = -daemonized;
1425 /* TODO error message */
1431 prepare_kernel_data:
1434 if (status.nfsv2.fhs_status != 0) {
1435 bb_error_msg("%s:%s failed, reason given by server: %s",
1437 nfs_strerror(status.nfsv2.fhs_status));
1440 memcpy(data.root.data,
1441 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1443 data.root.size = NFS_FHSIZE;
1444 memcpy(data.old_root.data,
1445 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1448 fhandle3 *my_fhandle;
1449 if (status.nfsv3.fhs_status != 0) {
1450 bb_error_msg("%s:%s failed, reason given by server: %s",
1452 nfs_strerror(status.nfsv3.fhs_status));
1455 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1456 memset(data.old_root.data, 0, NFS_FHSIZE);
1457 memset(&data.root, 0, sizeof(data.root));
1458 data.root.size = my_fhandle->fhandle3_len;
1459 memcpy(data.root.data,
1460 (char *) my_fhandle->fhandle3_val,
1461 my_fhandle->fhandle3_len);
1463 data.flags |= NFS_MOUNT_VER3;
1466 /* create nfs socket for kernel */
1469 if (nfs_mount_version < 3) {
1470 bb_error_msg("NFS over TCP is not supported");
1473 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1475 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1477 bb_perror_msg("nfs socket");
1480 if (bindresvport(fsock, 0) < 0) {
1481 bb_perror_msg("nfs bindresvport");
1485 server_addr.sin_port = PMAPPORT;
1486 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1487 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1491 server_addr.sin_port = htons(port);
1493 /* prepare data structure for kernel */
1496 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1497 strncpy(data.hostname, hostname, sizeof(data.hostname));
1501 auth_destroy(mclient->cl_auth);
1502 clnt_destroy(mclient);
1507 /* We must wait until mount directory is available */
1508 struct stat statbuf;
1510 while (stat(mp->mnt_dir, &statbuf) == -1) {
1512 daemonized = daemonize();
1513 if (daemonized <= 0) { /* parent or error */
1514 // FIXME: parent doesn't close fsock - ??!
1515 retval = -daemonized;
1519 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1526 do_mount: /* perform actual mount */
1528 mp->mnt_type = (char*)"nfs";
1529 retval = mount_it_now(mp, vfsflags, (char*)&data);
1536 auth_destroy(mclient->cl_auth);
1537 clnt_destroy(mclient);
1551 #else /* !ENABLE_FEATURE_MOUNT_NFS */
1553 /* Never called. Call should be optimized out. */
1554 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1556 #endif /* !ENABLE_FEATURE_MOUNT_NFS */
1558 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1559 // type detection. Returns 0 for success, nonzero for failure.
1560 // NB: mp->xxx fields may be trashed on exit
1561 static int singlemount(struct mntent *mp, int ignore_busy)
1565 char *loopFile = 0, *filteropts = 0;
1569 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1571 // Treat fstype "auto" as unspecified.
1573 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1574 mp->mnt_type = NULL;
1576 // Might this be a virtual filesystem?
1578 if (ENABLE_FEATURE_MOUNT_HELPERS
1579 && (strchr(mp->mnt_fsname, '#'))
1581 char *s, *p, *args[35];
1583 // FIXME: does it allow execution of arbitrary commands?!
1584 // What args[0] can end up with?
1585 for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) {
1586 if (s[0] == '#' && s[1] != '#') {
1593 args[n++] = mp->mnt_dir;
1595 rc = wait4pid(xspawn(args));
1599 // Might this be an CIFS filesystem?
1601 if (ENABLE_FEATURE_MOUNT_CIFS
1602 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1603 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1604 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1606 len_and_sockaddr *lsa;
1611 // Replace '/' with '\' and verify that unc points to "//server/share".
1613 for (s = mp->mnt_fsname; *s; ++s)
1614 if (*s == '/') *s = '\\';
1618 s = strrchr(mp->mnt_fsname, '\\');
1619 if (s <= mp->mnt_fsname+1) goto report_error;
1621 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1623 if (!lsa) goto report_error;
1625 // insert ip=... option into string flags.
1627 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1628 ip = xasprintf("ip=%s", dotted);
1629 parse_mount_options(ip, &filteropts);
1631 // compose new unc '\\server-ip\share'
1632 // (s => slash after hostname)
1634 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1637 vfsflags |= MS_MANDLOCK;
1639 mp->mnt_type = (char*)"cifs";
1640 rc = mount_it_now(mp, vfsflags, filteropts);
1641 if (ENABLE_FEATURE_CLEAN_UP) {
1642 free(mp->mnt_fsname);
1650 // Might this be an NFS filesystem?
1652 if (ENABLE_FEATURE_MOUNT_NFS
1653 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1654 && strchr(mp->mnt_fsname, ':') != NULL
1656 rc = nfsmount(mp, vfsflags, filteropts);
1660 // Look at the file. (Not found isn't a failure for remount, or for
1661 // a synthetic filesystem like proc or sysfs.)
1662 // (We use stat, not lstat, in order to allow
1663 // mount symlink_to_file_or_blkdev dir)
1665 if (!stat(mp->mnt_fsname, &st)
1666 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1668 // Do we need to allocate a loopback device for it?
1670 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1671 loopFile = bb_simplify_path(mp->mnt_fsname);
1672 mp->mnt_fsname = NULL; /* will receive malloced loop dev name */
1673 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1674 if (errno == EPERM || errno == EACCES)
1675 bb_error_msg(bb_msg_perm_denied_are_you_root);
1677 bb_perror_msg("cannot setup loop device");
1681 // Autodetect bind mounts
1683 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1684 vfsflags |= MS_BIND;
1687 /* If we know the fstype (or don't need to), jump straight
1688 * to the actual mount. */
1690 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1691 rc = mount_it_now(mp, vfsflags, filteropts);
1693 // Loop through filesystem types until mount succeeds
1696 /* Initialize list of block backed filesystems. This has to be
1697 * done here so that during "mount -a", mounts after /proc shows up
1698 * can autodetect. */
1701 fslist = get_block_backed_filesystems();
1702 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1703 atexit(delete_block_backed_filesystems);
1706 for (fl = fslist; fl; fl = fl->link) {
1707 mp->mnt_type = fl->data;
1708 rc = mount_it_now(mp, vfsflags, filteropts);
1713 // If mount failed, clean up loop file (if any).
1715 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1716 del_loop(mp->mnt_fsname);
1717 if (ENABLE_FEATURE_CLEAN_UP) {
1719 free(mp->mnt_fsname);
1724 if (ENABLE_FEATURE_CLEAN_UP)
1727 if (errno == EBUSY && ignore_busy)
1730 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1734 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1735 // each directory to be mounted.
1737 static const char must_be_root[] ALIGN1 = "you must be root";
1739 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1740 int mount_main(int argc UNUSED_PARAM, char **argv)
1742 char *cmdopts = xstrdup("");
1743 char *fstype = NULL;
1746 const char *fstabname;
1750 struct mntent mtpair[2], *mtcur = mtpair;
1751 SKIP_DESKTOP(const int nonroot = 0;)
1753 USE_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1755 // Parse long options, like --bind and --move. Note that -o option
1756 // and --option are synonymous. Yes, this means --remount,rw works.
1757 for (i = j = 1; argv[i]; i++) {
1758 if (argv[i][0] == '-' && argv[i][1] == '-')
1759 append_mount_options(&cmdopts, argv[i] + 2);
1761 argv[j++] = argv[i];
1765 // Parse remaining options
1766 // Max 2 params; -v is a counter
1767 opt_complementary = "?2" USE_FEATURE_MOUNT_VERBOSE(":vv");
1768 opt = getopt32(argv, OPTION_STR, &opt_o, &fstype
1769 USE_FEATURE_MOUNT_VERBOSE(, &verbose));
1770 if (opt & OPT_o) append_mount_options(&cmdopts, opt_o); // -o
1771 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1772 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1775 // If we have no arguments, show currently mounted filesystems
1777 if (!(opt & OPT_a)) {
1778 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1781 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1783 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1786 // Don't show rootfs. FIXME: why??
1787 // util-linux 2.12a happily shows rootfs...
1788 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1790 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1791 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1792 mtpair->mnt_dir, mtpair->mnt_type,
1795 if (ENABLE_FEATURE_CLEAN_UP)
1796 endmntent(mountTable);
1797 return EXIT_SUCCESS;
1799 storage_path = NULL;
1801 // When we have two arguments, the second is the directory and we can
1802 // skip looking at fstab entirely. We can always abspath() the directory
1803 // argument when we get it.
1806 bb_error_msg_and_die(must_be_root);
1807 mtpair->mnt_fsname = argv[0];
1808 mtpair->mnt_dir = argv[1];
1809 mtpair->mnt_type = fstype;
1810 mtpair->mnt_opts = cmdopts;
1811 if (ENABLE_FEATURE_MOUNT_LABEL) {
1812 resolve_mount_spec(&mtpair->mnt_fsname);
1814 rc = singlemount(mtpair, 0);
1817 storage_path = bb_simplify_path(argv[0]); // malloced
1820 // Past this point, we are handling either "mount -a [opts]"
1821 // or "mount [opts] single_param"
1823 i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int"
1824 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1825 bb_error_msg_and_die(must_be_root);
1827 // If we have a shared subtree flag, don't worry about fstab or mtab.
1828 if (ENABLE_FEATURE_MOUNT_FLAGS
1829 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1831 rc = verbose_mount(/*source:*/ "", /*target:*/ argv[0],
1832 /*type:*/ "", /*flags:*/ i, /*data:*/ "");
1834 bb_simple_perror_msg_and_die(argv[0]);
1838 // Open either fstab or mtab
1839 fstabname = "/etc/fstab";
1840 if (i & MS_REMOUNT) {
1841 // WARNING. I am not sure this matches util-linux's
1842 // behavior. It's possible util-linux does not
1843 // take -o opts from mtab (takes only mount source).
1844 fstabname = bb_path_mtab_file;
1846 fstab = setmntent(fstabname, "r");
1848 bb_perror_msg_and_die("cannot read %s", fstabname);
1850 // Loop through entries until we find what we're looking for
1851 memset(mtpair, 0, sizeof(mtpair));
1853 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
1855 // Get next fstab entry
1856 if (!getmntent_r(fstab, mtcur, getmntent_buf
1857 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
1858 GETMNTENT_BUFSIZE/2)
1859 ) { // End of fstab/mtab is reached
1860 mtcur = mtother; // the thing we found last time
1864 // If we're trying to mount something specific and this isn't it,
1865 // skip it. Note we must match the exact text in fstab (ala
1866 // "proc") or a full path from root
1869 // Is this what we're looking for?
1870 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1871 strcmp(storage_path, mtcur->mnt_fsname) &&
1872 strcmp(argv[0], mtcur->mnt_dir) &&
1873 strcmp(storage_path, mtcur->mnt_dir)) continue;
1875 // Remember this entry. Something later may have
1876 // overmounted it, and we want the _last_ match.
1879 // If we're mounting all
1881 // Do we need to match a filesystem type?
1882 if (fstype && match_fstype(mtcur, fstype))
1885 // Skip noauto and swap anyway.
1886 if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP))
1889 // No, mount -a won't mount anything,
1890 // even user mounts, for mere humans
1892 bb_error_msg_and_die(must_be_root);
1895 if (ENABLE_FEATURE_MOUNT_LABEL)
1896 resolve_mount_spec(&mtpair->mnt_fsname);
1898 // NFS mounts want this to be xrealloc-able
1899 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1900 if (singlemount(mtcur, 1)) {
1901 // Count number of failed mounts
1904 free(mtcur->mnt_opts);
1908 // End of fstab/mtab is reached.
1909 // Were we looking for something specific?
1911 // If we didn't find anything, complain
1912 if (!mtcur->mnt_fsname)
1913 bb_error_msg_and_die("can't find %s in %s",
1914 argv[0], fstabname);
1916 // fstab must have "users" or "user"
1917 if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
1918 bb_error_msg_and_die(must_be_root);
1921 // Mount the last thing we found
1922 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1923 append_mount_options(&(mtcur->mnt_opts), cmdopts);
1924 if (ENABLE_FEATURE_MOUNT_LABEL) {
1925 resolve_mount_spec(&mtpair->mnt_fsname);
1927 rc = singlemount(mtcur, 0);
1928 if (ENABLE_FEATURE_CLEAN_UP)
1929 free(mtcur->mnt_opts);
1932 if (ENABLE_FEATURE_CLEAN_UP)
1934 if (ENABLE_FEATURE_CLEAN_UP) {