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.
11 // Design notes: There is no spec for mount. Remind me to write one.
13 // mount_main() calls singlemount() which calls mount_it_now().
15 // mount_main() can loop through /etc/fstab for mount -a
16 // singlemount() can loop through /etc/filesystems for fstype detection.
17 // mount_it_now() does the actual mount.
21 #include <sys/mount.h>
22 // Grab more as needed from util-linux's mount/mount_constants.h
24 # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
27 # define MS_UNION (1 << 8)
30 # define MS_BIND (1 << 12)
33 # define MS_MOVE (1 << 13)
36 # define MS_RECURSIVE (1 << 14)
39 # define MS_SILENT (1 << 15)
41 // The shared subtree stuff, which went in around 2.6.15
43 # define MS_UNBINDABLE (1 << 17)
46 # define MS_PRIVATE (1 << 18)
49 # define MS_SLAVE (1 << 19)
52 # define MS_SHARED (1 << 20)
55 # define MS_RELATIME (1 << 21)
59 #if ENABLE_FEATURE_MOUNT_LABEL
60 # include "volume_id.h"
62 # define resolve_mount_spec(fsname) ((void)0)
65 // Needed for nfs support only
66 #include <sys/utsname.h>
70 #include <rpc/pmap_prot.h>
71 #include <rpc/pmap_clnt.h>
74 #if defined(__dietlibc__)
75 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
76 // dietlibc-0.30 does not have implementation of getmntent_r()
77 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
78 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
80 struct mntent* ment = getmntent(stream);
81 return memcpy(result, ment, sizeof(*ment));
86 // Not real flags, but we want to be able to check for this.
88 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
89 MOUNT_NOAUTO = (1 << 29),
90 MOUNT_SWAP = (1 << 30),
94 #define OPTION_STR "o:t:rwanfvsiO:"
109 #if ENABLE_FEATURE_MTAB_SUPPORT
110 #define USE_MTAB (!(option_mask32 & OPT_n))
115 #if ENABLE_FEATURE_MOUNT_FAKE
116 #define FAKE_IT (option_mask32 & OPT_f)
121 #if ENABLE_FEATURE_MOUNT_HELPERS
122 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
124 #define HELPERS_ALLOWED 0
128 // TODO: more "user" flag compatibility.
129 // "user" option (from mount manpage):
130 // Only the user that mounted a filesystem can unmount it again.
131 // If any user should be able to unmount, then use users instead of user
132 // in the fstab line. The owner option is similar to the user option,
133 // with the restriction that the user must be the owner of the special file.
134 // This may be useful e.g. for /dev/fd if a login script makes
135 // the console user owner of this device.
137 // Standard mount options (from -o options or --options),
138 // with corresponding flags
139 static const int32_t mount_options[] = {
140 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
142 IF_FEATURE_MOUNT_LOOP(
146 IF_FEATURE_MOUNT_FSTAB(
148 /* "quiet" 0 - do not filter out, vfat wants to see it */
149 /* "noauto" */ MOUNT_NOAUTO,
150 /* "sw" */ MOUNT_SWAP,
151 /* "swap" */ MOUNT_SWAP,
152 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
153 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
157 IF_FEATURE_MOUNT_FLAGS(
159 /* "nosuid" */ MS_NOSUID,
160 /* "suid" */ ~MS_NOSUID,
161 /* "dev" */ ~MS_NODEV,
162 /* "nodev" */ MS_NODEV,
163 /* "exec" */ ~MS_NOEXEC,
164 /* "noexec" */ MS_NOEXEC,
165 /* "sync" */ MS_SYNCHRONOUS,
166 /* "dirsync" */ MS_DIRSYNC,
167 /* "async" */ ~MS_SYNCHRONOUS,
168 /* "atime" */ ~MS_NOATIME,
169 /* "noatime" */ MS_NOATIME,
170 /* "diratime" */ ~MS_NODIRATIME,
171 /* "nodiratime" */ MS_NODIRATIME,
172 /* "mand" */ MS_MANDLOCK,
173 /* "nomand" */ ~MS_MANDLOCK,
174 /* "relatime" */ MS_RELATIME,
175 /* "norelatime" */ ~MS_RELATIME,
176 /* "loud" */ ~MS_SILENT,
179 /* "union" */ MS_UNION,
180 /* "bind" */ MS_BIND,
181 /* "move" */ MS_MOVE,
182 /* "shared" */ MS_SHARED,
183 /* "slave" */ MS_SLAVE,
184 /* "private" */ MS_PRIVATE,
185 /* "unbindable" */ MS_UNBINDABLE,
186 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
187 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
188 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
189 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
192 // Always understood.
193 /* "ro" */ MS_RDONLY, // vfs flag
194 /* "rw" */ ~MS_RDONLY, // vfs flag
195 /* "remount" */ MS_REMOUNT // action flag
198 static const char mount_option_str[] =
199 IF_FEATURE_MOUNT_LOOP(
202 IF_FEATURE_MOUNT_FSTAB(
204 // "quiet\0" - do not filter out, vfat wants to see it
209 IF_DESKTOP("users\0")
212 IF_FEATURE_MOUNT_FLAGS(
247 // Always understood.
250 "remount\0" // action flag
255 #if ENABLE_FEATURE_MOUNT_NFS
256 smalluint nfs_mount_version;
258 #if ENABLE_FEATURE_MOUNT_VERBOSE
262 char getmntent_buf[1];
265 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
266 #define G (*(struct globals*)&bb_common_bufsiz1)
267 #define nfs_mount_version (G.nfs_mount_version)
268 #if ENABLE_FEATURE_MOUNT_VERBOSE
269 #define verbose (G.verbose )
273 #define fslist (G.fslist )
274 #define getmntent_buf (G.getmntent_buf )
277 #if ENABLE_FEATURE_MOUNT_VERBOSE
278 static int verbose_mount(const char *source, const char *target,
279 const char *filesystemtype,
280 unsigned long mountflags, const void *data)
285 rc = mount(source, target, filesystemtype, mountflags, data);
287 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
288 source, target, filesystemtype,
289 mountflags, (char*)data, rc);
293 #define verbose_mount(...) mount(__VA_ARGS__)
296 // Append mount options to string
297 static void append_mount_options(char **oldopts, const char *newopts)
299 if (*oldopts && **oldopts) {
300 // Do not insert options which are already there
303 int len = strlen(newopts);
304 p = strchr(newopts, ',');
305 if (p) len = p - newopts;
308 if (!strncmp(p, newopts, len)
309 && (p[len] == ',' || p[len] == '\0'))
315 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
320 while (newopts[0] == ',') newopts++;
323 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
324 *oldopts = xstrdup(newopts);
328 // Use the mount_options list to parse options into flags.
329 // Also return list of unrecognized options if unrecognized != NULL
330 static long parse_mount_options(char *options, char **unrecognized)
332 long flags = MS_SILENT;
334 // Loop through options
337 char *comma = strchr(options, ',');
338 const char *option_str = mount_option_str;
340 if (comma) *comma = '\0';
342 // FIXME: use hasmntopt()
343 // Find this option in mount_options
344 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
345 if (!strcasecmp(option_str, options)) {
346 long fl = mount_options[i];
347 if (fl < 0) flags &= fl;
351 option_str += strlen(option_str) + 1;
353 // If unrecognized not NULL, append unrecognized mount options
354 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
355 // Add it to strflags, to pass on to kernel
356 i = *unrecognized ? strlen(*unrecognized) : 0;
357 *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2);
359 // Comma separated if it's not the first one
360 if (i) (*unrecognized)[i++] = ',';
361 strcpy((*unrecognized)+i, options);
366 // Advance to next option
374 // Return a list of all block device backed filesystems
375 static llist_t *get_block_backed_filesystems(void)
377 static const char filesystems[2][sizeof("/proc/filesystems")] = {
382 llist_t *list = NULL;
386 for (i = 0; i < 2; i++) {
387 f = fopen_for_read(filesystems[i]);
390 while ((buf = xmalloc_fgetline(f)) != NULL) {
391 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
393 fs = skip_whitespace(buf);
394 if (*fs == '#' || *fs == '*' || !*fs)
397 llist_add_to_end(&list, xstrdup(fs));
400 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
406 #if ENABLE_FEATURE_CLEAN_UP
407 static void delete_block_backed_filesystems(void)
409 llist_free(fslist, free);
412 void delete_block_backed_filesystems(void);
415 // Perform actual mount of specific filesystem at specific location.
416 // NB: mp->xxx fields may be trashed on exit
417 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
423 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
424 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
425 vfsflags, filteropts);
429 // Mount, with fallback to read-only if necessary.
432 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
433 vfsflags, filteropts);
435 // If mount failed, try
436 // helper program mount.<mnt_type>
437 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
439 int errno_save = errno;
440 args[0] = xasprintf("mount.%s", mp->mnt_type);
443 args[rc++] = (char *)"-f";
444 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
445 args[rc++] = (char *)"-n";
446 args[rc++] = mp->mnt_fsname;
447 args[rc++] = mp->mnt_dir;
449 args[rc++] = (char *)"-o";
450 args[rc++] = filteropts;
453 rc = wait4pid(spawn(args));
460 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
462 if (!(vfsflags & MS_SILENT))
463 bb_error_msg("%s is write-protected, mounting read-only",
465 vfsflags |= MS_RDONLY;
468 // Abort entirely if permission denied.
470 if (rc && errno == EPERM)
471 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
473 // If the mount was successful, and we're maintaining an old-style
474 // mtab file by hand, add the new entry to it now.
476 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
478 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
479 const char *option_str = mount_option_str;
483 bb_error_msg("no %s", bb_path_mtab_file);
487 // Add vfs string flags
489 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
490 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
491 append_mount_options(&(mp->mnt_opts), option_str);
492 option_str += strlen(option_str) + 1;
495 // Remove trailing / (if any) from directory we mounted on
497 i = strlen(mp->mnt_dir) - 1;
498 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
500 // Convert to canonical pathnames as needed
502 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
504 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
505 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
506 mp->mnt_type = (char*)"bind";
508 mp->mnt_freq = mp->mnt_passno = 0;
512 addmntent(mountTable, mp);
513 endmntent(mountTable);
514 if (ENABLE_FEATURE_CLEAN_UP) {
523 #if ENABLE_FEATURE_MOUNT_NFS
527 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
529 * Licensed under GPLv2, see file LICENSE in this tarball for details.
531 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
532 * numbers to be specified on the command line.
534 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
535 * Omit the call to connect() for Linux version 1.3.11 or later.
537 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
538 * Implemented the "bg", "fg" and "retry" mount options for NFS.
540 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
541 * - added Native Language Support
543 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
547 /* This is just a warning of a common mistake. Possibly this should be a
548 * uclibc faq entry rather than in busybox... */
549 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
550 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
553 #define MOUNTPORT 635
554 #define MNTPATHLEN 1024
555 #define MNTNAMLEN 255
559 typedef char fhandle[FHSIZE];
562 unsigned int fhandle3_len;
574 MNT3ERR_NAMETOOLONG = 63,
575 MNT3ERR_NOTSUPP = 10004,
576 MNT3ERR_SERVERFAULT = 10006,
578 typedef enum mountstat3 mountstat3;
581 unsigned int fhs_status;
586 typedef struct fhstatus fhstatus;
588 struct mountres3_ok {
591 unsigned int auth_flavours_len;
592 char *auth_flavours_val;
595 typedef struct mountres3_ok mountres3_ok;
598 mountstat3 fhs_status;
600 mountres3_ok mountinfo;
603 typedef struct mountres3 mountres3;
605 typedef char *dirpath;
609 typedef struct mountbody *mountlist;
613 dirpath ml_directory;
616 typedef struct mountbody mountbody;
618 typedef struct groupnode *groups;
624 typedef struct groupnode groupnode;
626 typedef struct exportnode *exports;
633 typedef struct exportnode exportnode;
646 typedef struct ppathcnf ppathcnf;
648 #define MOUNTPROG 100005
651 #define MOUNTPROC_NULL 0
652 #define MOUNTPROC_MNT 1
653 #define MOUNTPROC_DUMP 2
654 #define MOUNTPROC_UMNT 3
655 #define MOUNTPROC_UMNTALL 4
656 #define MOUNTPROC_EXPORT 5
657 #define MOUNTPROC_EXPORTALL 6
659 #define MOUNTVERS_POSIX 2
661 #define MOUNTPROC_PATHCONF 7
665 #define MOUNTPROC3_NULL 0
666 #define MOUNTPROC3_MNT 1
667 #define MOUNTPROC3_DUMP 2
668 #define MOUNTPROC3_UMNT 3
669 #define MOUNTPROC3_UMNTALL 4
670 #define MOUNTPROC3_EXPORT 5
682 * We want to be able to compile mount on old kernels in such a way
683 * that the binary will work well on more recent kernels.
684 * Thus, if necessary we teach nfsmount.c the structure of new fields
685 * that will come later.
687 * Moreover, the new kernel includes conflict with glibc includes
688 * so it is easiest to ignore the kernel altogether (at compile time).
696 unsigned char data[64];
699 struct nfs_mount_data {
702 struct nfs2_fh old_root; /* 1 */
708 int acregmin; /* 1 */
709 int acregmax; /* 1 */
710 int acdirmin; /* 1 */
711 int acdirmax; /* 1 */
712 struct sockaddr_in addr; /* 1 */
713 char hostname[256]; /* 1 */
715 unsigned int bsize; /* 3 */
716 struct nfs3_fh root; /* 4 */
719 /* bits in the flags field */
721 NFS_MOUNT_SOFT = 0x0001, /* 1 */
722 NFS_MOUNT_INTR = 0x0002, /* 1 */
723 NFS_MOUNT_SECURE = 0x0004, /* 1 */
724 NFS_MOUNT_POSIX = 0x0008, /* 1 */
725 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
726 NFS_MOUNT_NOAC = 0x0020, /* 1 */
727 NFS_MOUNT_TCP = 0x0040, /* 2 */
728 NFS_MOUNT_VER3 = 0x0080, /* 3 */
729 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
730 NFS_MOUNT_NONLM = 0x0200, /* 3 */
731 NFS_MOUNT_NORDIRPLUS = 0x4000
736 * We need to translate between nfs status return values and
737 * the local errno values which may not be the same.
739 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
740 * "after #include <errno.h> the symbol errno is reserved for any use,
741 * it cannot even be used as a struct tag or field name".
745 #define EDQUOT ENOSPC
748 /* Convert each NFSERR_BLAH into EBLAH */
749 static const struct {
753 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
754 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
755 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
756 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
758 static char *nfs_strerror(int status)
762 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
763 if (nfs_errtbl[i].stat == status)
764 return strerror(nfs_errtbl[i].errnum);
766 return xasprintf("unknown nfs status return value: %d", status);
769 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
771 if (!xdr_opaque(xdrs, objp, FHSIZE))
776 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
778 if (!xdr_u_int(xdrs, &objp->fhs_status))
780 switch (objp->fhs_status) {
782 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
791 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
793 if (!xdr_string(xdrs, objp, MNTPATHLEN))
798 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
800 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
805 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
807 if (!xdr_fhandle3(xdrs, &objp->fhandle))
809 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
810 sizeof(int), (xdrproc_t) xdr_int))
815 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
817 if (!xdr_enum(xdrs, (enum_t *) objp))
822 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
824 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
826 switch (objp->fhs_status) {
828 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
837 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
840 * Unfortunately, the kernel prints annoying console messages
841 * in case of an unexpected nfs mount version (instead of
842 * just returning some error). Therefore we'll have to try
843 * and figure out what version the kernel expects.
846 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
847 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
848 * nfs_mount_version: version this source and running kernel can handle
851 find_kernel_nfs_mount_version(void)
855 if (nfs_mount_version)
858 nfs_mount_version = 4; /* default */
860 kernel_version = get_linux_version_code();
861 if (kernel_version) {
862 if (kernel_version < KERNEL_VERSION(2,1,32))
863 nfs_mount_version = 1;
864 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
865 (kernel_version >= KERNEL_VERSION(2,3,0) &&
866 kernel_version < KERNEL_VERSION(2,3,99)))
867 nfs_mount_version = 3;
868 /* else v4 since 2.3.99pre4 */
873 get_mountport(struct pmap *pm_mnt,
874 struct sockaddr_in *server_addr,
876 long unsigned version,
880 struct pmaplist *pmap;
882 server_addr->sin_port = PMAPPORT;
883 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
884 * I understand it like "IPv6 for this is not 100% ready" */
885 pmap = pmap_getmaps(server_addr);
887 if (version > MAX_NFSPROT)
888 version = MAX_NFSPROT;
891 pm_mnt->pm_prog = prog;
892 pm_mnt->pm_vers = version;
893 pm_mnt->pm_prot = proto;
894 pm_mnt->pm_port = port;
897 if (pmap->pml_map.pm_prog != prog)
899 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
901 if (version > 2 && pmap->pml_map.pm_vers != version)
903 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
905 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
906 (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) ||
907 (port && pmap->pml_map.pm_port != port))
909 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
911 pmap = pmap->pml_next;
913 if (!pm_mnt->pm_vers)
914 pm_mnt->pm_vers = MOUNTVERS;
915 if (!pm_mnt->pm_port)
916 pm_mnt->pm_port = MOUNTPORT;
917 if (!pm_mnt->pm_prot)
918 pm_mnt->pm_prot = IPPROTO_TCP;
922 static int daemonize(void)
925 if (pid < 0) /* error */
927 if (pid > 0) /* parent */
931 xopen(bb_dev_null, O_RDWR);
935 openlog(applet_name, LOG_PID, LOG_DAEMON);
936 logmode = LOGMODE_SYSLOG;
940 static inline int daemonize(void) { return -ENOSYS; }
944 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
949 /* RPC strerror analogs are terminally idiotic:
950 * *mandatory* prefix and \n at end.
951 * This hopefully helps. Usage:
952 * error_msg_rpc(clnt_*error*(" ")) */
953 static void error_msg_rpc(const char *msg)
956 while (msg[0] == ' ' || msg[0] == ':') msg++;
958 while (len && msg[len-1] == '\n') len--;
959 bb_error_msg("%.*s", len, msg);
962 /* NB: mp->xxx fields may be trashed on exit */
963 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
969 /* prior to 2.6.23, kernel took NFS options in a form of this struct
970 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
971 * then data pointer is interpreted as a string. */
972 struct nfs_mount_data data;
975 struct sockaddr_in server_addr;
976 struct sockaddr_in mount_server_addr;
979 struct fhstatus nfsv2;
980 struct mountres3 nfsv3;
998 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1008 find_kernel_nfs_mount_version();
1016 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1018 filteropts = xstrdup(filteropts); /* going to trash it later... */
1020 hostname = xstrdup(mp->mnt_fsname);
1021 /* mount_main() guarantees that ':' is there */
1022 s = strchr(hostname, ':');
1025 /* Ignore all but first hostname in replicated mounts
1026 until they can be fully supported. (mack@sgi.com) */
1027 s = strchr(hostname, ',');
1030 bb_error_msg("warning: multiple hostnames not supported");
1033 server_addr.sin_family = AF_INET;
1034 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1035 hp = gethostbyname(hostname);
1037 bb_herror_msg("%s", hostname);
1040 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1041 bb_error_msg("got bad hp->h_length");
1042 hp->h_length = sizeof(struct in_addr);
1044 memcpy(&server_addr.sin_addr,
1045 hp->h_addr, hp->h_length);
1048 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1050 /* add IP address to mtab options for use when unmounting */
1052 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1053 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1055 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1056 mp->mnt_opts[0] ? "," : "",
1057 inet_ntoa(server_addr.sin_addr));
1062 /* Set default options.
1063 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1064 * let the kernel decide.
1065 * timeo is filled in after we know whether it'll be TCP or UDP. */
1066 memset(&data, 0, sizeof(data));
1072 data.namlen = NAME_MAX;
1081 retry = 10000; /* 10000 minutes ~ 1 week */
1084 mountprog = MOUNTPROG;
1092 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1093 char *opteq = strchr(opt, '=');
1096 static const char options[] ALIGN1 =
1101 /* 4 */ "acregmin\0"
1102 /* 5 */ "acregmax\0"
1103 /* 6 */ "acdirmin\0"
1104 /* 7 */ "acdirmax\0"
1108 /* 11 */ "mountport\0"
1109 /* 12 */ "mounthost\0"
1110 /* 13 */ "mountprog\0"
1111 /* 14 */ "mountvers\0"
1112 /* 15 */ "nfsprog\0"
1113 /* 16 */ "nfsvers\0"
1120 idx = index_in_strings(options, opt);
1122 case 12: // "mounthost"
1123 mounthost = xstrndup(opteq,
1124 strcspn(opteq, " \t\n\r,"));
1127 if (!strncmp(opteq, "tcp", 3))
1129 else if (!strncmp(opteq, "udp", 3))
1132 bb_error_msg("warning: unrecognized proto= option");
1134 case 20: // "addr" - ignore
1138 val = xatoi_u(opteq);
1149 case 3: // "retrans"
1152 case 4: // "acregmin"
1153 data.acregmin = val;
1155 case 5: // "acregmax"
1156 data.acregmax = val;
1158 case 6: // "acdirmin"
1159 data.acdirmin = val;
1161 case 7: // "acdirmax"
1162 data.acdirmax = val;
1164 case 8: // "actimeo"
1165 data.acregmin = val;
1166 data.acregmax = val;
1167 data.acdirmin = val;
1168 data.acdirmax = val;
1176 case 11: // "mountport"
1179 case 13: // "mountprog"
1182 case 14: // "mountvers"
1185 case 15: // "nfsprog"
1188 case 16: // "nfsvers"
1192 case 19: // "namlen"
1193 //if (nfs_mount_version >= 2)
1196 // bb_error_msg("warning: option namlen is not supported\n");
1199 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1203 else { /* not of the form opt=val */
1204 static const char options[] ALIGN1 =
1218 if (!strncmp(opt, "no", 2)) {
1222 switch (index_in_strings(options, opt)) {
1258 if (nfs_mount_version >= 3)
1261 bb_error_msg("warning: option nolock is not supported");
1267 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1272 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1274 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1275 | (intr ? NFS_MOUNT_INTR : 0)
1276 | (posix ? NFS_MOUNT_POSIX : 0)
1277 | (nocto ? NFS_MOUNT_NOCTO : 0)
1278 | (noac ? NFS_MOUNT_NOAC : 0)
1279 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1280 if (nfs_mount_version >= 2)
1281 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1282 if (nfs_mount_version >= 3)
1283 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1284 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1285 bb_error_msg("NFSv%d not supported", nfsvers);
1288 if (nfsvers && !mountvers)
1289 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1290 if (nfsvers && nfsvers < mountvers) {
1291 mountvers = nfsvers;
1294 /* Adjust options if none specified */
1296 data.timeo = tcp ? 70 : 7;
1298 data.version = nfs_mount_version;
1300 if (vfsflags & MS_REMOUNT)
1304 * If the previous mount operation on the same host was
1305 * backgrounded, and the "bg" for this mount is also set,
1306 * give up immediately, to avoid the initial timeout.
1308 if (bg && we_saw_this_host_before(hostname)) {
1309 daemonized = daemonize();
1310 if (daemonized <= 0) { /* parent or error */
1311 retval = -daemonized;
1316 /* Create mount daemon client */
1317 /* See if the nfs host = mount host. */
1319 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1320 mount_server_addr.sin_family = AF_INET;
1321 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1323 hp = gethostbyname(mounthost);
1325 bb_herror_msg("%s", mounthost);
1328 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1329 bb_error_msg("got bad hp->h_length");
1330 hp->h_length = sizeof(struct in_addr);
1332 mount_server_addr.sin_family = AF_INET;
1333 memcpy(&mount_server_addr.sin_addr,
1334 hp->h_addr, hp->h_length);
1339 * The following loop implements the mount retries. When the mount
1340 * times out, and the "bg" option is set, we background ourself
1341 * and continue trying.
1343 * The case where the mount point is not present and the "bg"
1344 * option is set, is treated as a timeout. This is done to
1345 * support nested mounts.
1347 * The "retry" count specified by the user is the number of
1348 * minutes to retry before giving up.
1351 struct timeval total_timeout;
1352 struct timeval retry_timeout;
1358 retry_timeout.tv_sec = 3;
1359 retry_timeout.tv_usec = 0;
1360 total_timeout.tv_sec = 20;
1361 total_timeout.tv_usec = 0;
1362 /* FIXME: use monotonic()? */
1363 timeout = time(NULL) + 60 * retry;
1367 /* Be careful not to use too many CPU cycles */
1371 get_mountport(&pm_mnt, &mount_server_addr,
1376 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1378 /* contact the mount daemon via TCP */
1379 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1380 msock = RPC_ANYSOCK;
1382 switch (pm_mnt.pm_prot) {
1384 mclient = clntudp_create(&mount_server_addr,
1391 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1392 msock = RPC_ANYSOCK;
1394 mclient = clnttcp_create(&mount_server_addr,
1403 if (!daemonized && prevt == 0)
1404 error_msg_rpc(clnt_spcreateerror(" "));
1406 enum clnt_stat clnt_stat;
1408 /* Try to mount hostname:pathname */
1409 mclient->cl_auth = authunix_create_default();
1411 /* Make pointers in xdr_mountres3 NULL so
1412 * that xdr_array allocates memory for us
1414 memset(&status, 0, sizeof(status));
1416 if (pm_mnt.pm_vers == 3)
1417 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1418 (xdrproc_t) xdr_dirpath,
1419 (caddr_t) &pathname,
1420 (xdrproc_t) xdr_mountres3,
1424 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1425 (xdrproc_t) xdr_dirpath,
1426 (caddr_t) &pathname,
1427 (xdrproc_t) xdr_fhstatus,
1431 if (clnt_stat == RPC_SUCCESS)
1432 goto prepare_kernel_data; /* we're done */
1433 if (errno != ECONNREFUSED) {
1434 error_msg_rpc(clnt_sperror(mclient, " "));
1435 goto fail; /* don't retry */
1437 /* Connection refused */
1438 if (!daemonized && prevt == 0) /* print just once */
1439 error_msg_rpc(clnt_sperror(mclient, " "));
1440 auth_destroy(mclient->cl_auth);
1441 clnt_destroy(mclient);
1447 /* Timeout. We are going to retry... maybe */
1451 daemonized = daemonize();
1452 if (daemonized <= 0) { /* parent or error */
1453 retval = -daemonized;
1460 /* TODO error message */
1466 prepare_kernel_data:
1469 if (status.nfsv2.fhs_status != 0) {
1470 bb_error_msg("%s:%s failed, reason given by server: %s",
1472 nfs_strerror(status.nfsv2.fhs_status));
1475 memcpy(data.root.data,
1476 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1478 data.root.size = NFS_FHSIZE;
1479 memcpy(data.old_root.data,
1480 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1483 fhandle3 *my_fhandle;
1484 if (status.nfsv3.fhs_status != 0) {
1485 bb_error_msg("%s:%s failed, reason given by server: %s",
1487 nfs_strerror(status.nfsv3.fhs_status));
1490 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1491 memset(data.old_root.data, 0, NFS_FHSIZE);
1492 memset(&data.root, 0, sizeof(data.root));
1493 data.root.size = my_fhandle->fhandle3_len;
1494 memcpy(data.root.data,
1495 (char *) my_fhandle->fhandle3_val,
1496 my_fhandle->fhandle3_len);
1498 data.flags |= NFS_MOUNT_VER3;
1501 /* Create nfs socket for kernel */
1503 if (nfs_mount_version < 3) {
1504 bb_error_msg("NFS over TCP is not supported");
1507 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1509 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1511 bb_perror_msg("nfs socket");
1514 if (bindresvport(fsock, 0) < 0) {
1515 bb_perror_msg("nfs bindresvport");
1519 server_addr.sin_port = PMAPPORT;
1520 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1521 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1525 server_addr.sin_port = htons(port);
1527 /* Prepare data structure for kernel */
1529 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1530 strncpy(data.hostname, hostname, sizeof(data.hostname));
1533 auth_destroy(mclient->cl_auth);
1534 clnt_destroy(mclient);
1539 /* We must wait until mount directory is available */
1540 struct stat statbuf;
1542 while (stat(mp->mnt_dir, &statbuf) == -1) {
1544 daemonized = daemonize();
1545 if (daemonized <= 0) { /* parent or error */
1546 /* FIXME: parent doesn't close fsock - ??! */
1547 retval = -daemonized;
1551 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1558 /* Perform actual mount */
1560 mp->mnt_type = (char*)"nfs";
1561 retval = mount_it_now(mp, vfsflags, (char*)&data);
1568 auth_destroy(mclient->cl_auth);
1569 clnt_destroy(mclient);
1583 #else // !ENABLE_FEATURE_MOUNT_NFS
1585 // Never called. Call should be optimized out.
1586 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1588 #endif // !ENABLE_FEATURE_MOUNT_NFS
1590 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1591 // type detection. Returns 0 for success, nonzero for failure.
1592 // NB: mp->xxx fields may be trashed on exit
1593 static int singlemount(struct mntent *mp, int ignore_busy)
1597 char *loopFile = NULL, *filteropts = NULL;
1601 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1603 // Treat fstype "auto" as unspecified
1604 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1605 mp->mnt_type = NULL;
1607 // Might this be a virtual filesystem?
1608 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1612 // fsname: "cmd#arg1#arg2..."
1613 // WARNING: allows execution of arbitrary commands!
1614 // Try "mount 'sh#-c#sh' bogus_dir".
1615 // It is safe ONLY because non-root
1616 // cannot use two-argument mount command
1617 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1618 // "mount: can't find sh#-c#sh in /etc/fstab"
1619 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1624 while (*s && n < 35 - 2) {
1625 if (*s++ == '#' && *s != '#') {
1630 args[n++] = mp->mnt_dir;
1632 rc = wait4pid(xspawn(args));
1636 // Might this be an CIFS filesystem?
1637 if (ENABLE_FEATURE_MOUNT_CIFS
1638 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1639 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1640 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1642 #if 0 /* reported to break things */
1643 len_and_sockaddr *lsa;
1647 // Replace '/' with '\' and verify that unc points to "//server/share".
1648 for (s = mp->mnt_fsname; *s; ++s)
1649 if (*s == '/') *s = '\\';
1652 s = strrchr(mp->mnt_fsname, '\\');
1653 if (s <= mp->mnt_fsname+1)
1656 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1661 // Insert ip=... option into string flags.
1662 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1663 ip = xasprintf("ip=%s", dotted);
1664 parse_mount_options(ip, &filteropts);
1666 // Compose new unc '\\server-ip\share'
1667 // (s => slash after hostname)
1668 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1670 // Lock is required [why?]
1671 vfsflags |= MS_MANDLOCK;
1672 mp->mnt_type = (char*)"cifs";
1673 rc = mount_it_now(mp, vfsflags, filteropts);
1675 if (ENABLE_FEATURE_CLEAN_UP) {
1676 free(mp->mnt_fsname);
1685 // Might this be an NFS filesystem?
1686 if (ENABLE_FEATURE_MOUNT_NFS
1687 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1688 && strchr(mp->mnt_fsname, ':') != NULL
1690 rc = nfsmount(mp, vfsflags, filteropts);
1694 // Look at the file. (Not found isn't a failure for remount, or for
1695 // a synthetic filesystem like proc or sysfs.)
1696 // (We use stat, not lstat, in order to allow
1697 // mount symlink_to_file_or_blkdev dir)
1698 if (!stat(mp->mnt_fsname, &st)
1699 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1701 // Do we need to allocate a loopback device for it?
1702 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1703 loopFile = bb_simplify_path(mp->mnt_fsname);
1704 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1705 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1706 if (errno == EPERM || errno == EACCES)
1707 bb_error_msg(bb_msg_perm_denied_are_you_root);
1709 bb_perror_msg("can't setup loop device");
1713 // Autodetect bind mounts
1714 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1715 vfsflags |= MS_BIND;
1718 // If we know the fstype (or don't need to), jump straight
1719 // to the actual mount.
1720 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1721 rc = mount_it_now(mp, vfsflags, filteropts);
1723 // Loop through filesystem types until mount succeeds
1726 // Initialize list of block backed filesystems. This has to be
1727 // done here so that during "mount -a", mounts after /proc shows up
1730 fslist = get_block_backed_filesystems();
1731 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1732 atexit(delete_block_backed_filesystems);
1735 for (fl = fslist; fl; fl = fl->link) {
1736 mp->mnt_type = fl->data;
1737 rc = mount_it_now(mp, vfsflags, filteropts);
1743 // If mount failed, clean up loop file (if any).
1744 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1745 del_loop(mp->mnt_fsname);
1746 if (ENABLE_FEATURE_CLEAN_UP) {
1748 free(mp->mnt_fsname);
1753 if (ENABLE_FEATURE_CLEAN_UP)
1756 if (errno == EBUSY && ignore_busy)
1759 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1764 // -O interprets a list of filter options which select whether a mount
1765 // point will be mounted: only mounts with options matching *all* filtering
1766 // options will be selected.
1767 // By default each -O filter option must be present in the list of mount
1768 // options, but if it is prefixed by "no" then it must be absent.
1770 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1771 // (and also fails to match -o a because -o c is absent).
1773 // It is different from -t in that each option is matched exactly; a leading
1774 // "no" at the beginning of one option does not negate the rest.
1775 static int match_opt(const char *fs_opt_in, const char *O_opt)
1781 const char *fs_opt = fs_opt_in;
1785 // If option begins with "no" then treat as an inverted match:
1786 // matching is a failure
1788 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1792 // Isolate the current O option
1793 O_len = strchrnul(O_opt, ',') - O_opt;
1794 // Check for a match against existing options
1796 if (strncmp(fs_opt, O_opt, O_len) == 0
1797 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1800 return 0; // "no" prefix, but option found
1801 match = 1; // current O option found, go check next one
1804 fs_opt = strchr(fs_opt, ',');
1810 return 0; // match wanted but not found
1811 if (O_opt[O_len] == '\0') // end?
1813 // Step to the next O option
1816 // If we get here then everything matched
1820 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1821 // each directory to be mounted.
1822 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1823 int mount_main(int argc UNUSED_PARAM, char **argv)
1825 char *cmdopts = xzalloc(1);
1826 char *fstype = NULL;
1827 char *O_optmatch = NULL;
1829 llist_t *lst_o = NULL;
1830 const char *fstabname;
1833 int rc = EXIT_SUCCESS;
1835 struct mntent mtpair[2], *mtcur = mtpair;
1836 IF_NOT_DESKTOP(const int nonroot = 0;)
1838 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1840 // Parse long options, like --bind and --move. Note that -o option
1841 // and --option are synonymous. Yes, this means --remount,rw works.
1842 for (i = j = 1; argv[i]; i++) {
1843 if (argv[i][0] == '-' && argv[i][1] == '-')
1844 append_mount_options(&cmdopts, argv[i] + 2);
1846 argv[j++] = argv[i];
1850 // Parse remaining options
1851 // Max 2 params; -o is a list, -v is a counter
1852 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1853 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1854 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1855 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1856 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1857 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1860 // If we have no arguments, show currently mounted filesystems
1862 if (!(opt & OPT_a)) {
1863 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1866 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1868 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1871 // Don't show rootfs. FIXME: why??
1872 // util-linux 2.12a happily shows rootfs...
1873 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1875 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1876 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1877 mtpair->mnt_dir, mtpair->mnt_type,
1880 if (ENABLE_FEATURE_CLEAN_UP)
1881 endmntent(mountTable);
1882 return EXIT_SUCCESS;
1884 storage_path = NULL;
1886 // When we have two arguments, the second is the directory and we can
1887 // skip looking at fstab entirely. We can always abspath() the directory
1888 // argument when we get it.
1891 bb_error_msg_and_die(bb_msg_you_must_be_root);
1892 mtpair->mnt_fsname = argv[0];
1893 mtpair->mnt_dir = argv[1];
1894 mtpair->mnt_type = fstype;
1895 mtpair->mnt_opts = cmdopts;
1896 resolve_mount_spec(&mtpair->mnt_fsname);
1897 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
1900 storage_path = bb_simplify_path(argv[0]); // malloced
1903 // Past this point, we are handling either "mount -a [opts]"
1904 // or "mount [opts] single_param"
1906 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
1907 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1908 bb_error_msg_and_die(bb_msg_you_must_be_root);
1910 // If we have a shared subtree flag, don't worry about fstab or mtab.
1911 if (ENABLE_FEATURE_MOUNT_FLAGS
1912 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1914 // verbose_mount(source, target, type, flags, data)
1915 rc = verbose_mount("", argv[0], "", i, "");
1917 bb_simple_perror_msg_and_die(argv[0]);
1921 // Open either fstab or mtab
1922 fstabname = "/etc/fstab";
1923 if (i & MS_REMOUNT) {
1924 // WARNING. I am not sure this matches util-linux's
1925 // behavior. It's possible util-linux does not
1926 // take -o opts from mtab (takes only mount source).
1927 fstabname = bb_path_mtab_file;
1929 fstab = setmntent(fstabname, "r");
1931 bb_perror_msg_and_die("can't read %s", fstabname);
1933 // Loop through entries until we find what we're looking for
1934 memset(mtpair, 0, sizeof(mtpair));
1936 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
1938 // Get next fstab entry
1939 if (!getmntent_r(fstab, mtcur, getmntent_buf
1940 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
1941 GETMNTENT_BUFSIZE/2)
1942 ) { // End of fstab/mtab is reached
1943 mtcur = mtother; // the thing we found last time
1947 // If we're trying to mount something specific and this isn't it,
1948 // skip it. Note we must match the exact text in fstab (ala
1949 // "proc") or a full path from root
1952 // Is this what we're looking for?
1953 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
1954 && strcmp(storage_path, mtcur->mnt_fsname) != 0
1955 && strcmp(argv[0], mtcur->mnt_dir) != 0
1956 && strcmp(storage_path, mtcur->mnt_dir) != 0
1961 // Remember this entry. Something later may have
1962 // overmounted it, and we want the _last_ match.
1965 // If we're mounting all
1968 // No, mount -a won't mount anything,
1969 // even user mounts, for mere humans
1971 bb_error_msg_and_die(bb_msg_you_must_be_root);
1973 // Does type match? (NULL matches always)
1974 if (!match_fstype(mtcur, fstype))
1977 // Skip noauto and swap anyway
1978 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
1979 // swap is bogus "fstype", parse_mount_options can't check fstypes
1980 || strcasecmp(mtcur->mnt_type, "swap") == 0
1985 // Does (at least one) option match?
1986 // (NULL matches always)
1987 if (!match_opt(mtcur->mnt_opts, O_optmatch))
1990 resolve_mount_spec(&mtcur->mnt_fsname);
1992 // NFS mounts want this to be xrealloc-able
1993 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1995 // If nothing is mounted on this directory...
1996 // (otherwise repeated "mount -a" mounts everything again)
1997 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
1998 // We do not check fsname match of found mount point -
1999 // "/" may have fsname of "/dev/root" while fstab
2000 // says "/dev/something_else".
2003 bb_error_msg("according to %s, "
2004 "%s is already mounted on %s",
2006 mp->mnt_fsname, mp->mnt_dir);
2009 // ...mount this thing
2010 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2011 // Count number of failed mounts
2015 free(mtcur->mnt_opts);
2019 // End of fstab/mtab is reached.
2020 // Were we looking for something specific?
2021 if (argv[0]) { // yes
2024 // If we didn't find anything, complain
2025 if (!mtcur->mnt_fsname)
2026 bb_error_msg_and_die("can't find %s in %s",
2027 argv[0], fstabname);
2029 // What happens when we try to "mount swap_partition"?
2030 // (fstab containts "swap_partition swap swap defaults 0 0")
2031 // util-linux-ng 2.13.1 does this:
2032 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2033 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2034 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2035 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2036 // exit_group(32) = ?
2038 // In case we want to simply skip swap partitions:
2039 l = parse_mount_options(mtcur->mnt_opts, NULL);
2040 if ((l & MOUNT_SWAP)
2041 // swap is bogus "fstype", parse_mount_options can't check fstypes
2042 || strcasecmp(mtcur->mnt_type, "swap") == 0
2048 // fstab must have "users" or "user"
2049 l = parse_mount_options(mtcur->mnt_opts, NULL);
2050 if (!(l & MOUNT_USERS))
2051 bb_error_msg_and_die(bb_msg_you_must_be_root);
2054 //util-linux-2.12 does not do this check.
2055 //// If nothing is mounted on this directory...
2056 //// (otherwise repeated "mount FOO" mounts FOO again)
2057 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2059 // bb_error_msg("according to %s, "
2060 // "%s is already mounted on %s",
2061 // bb_path_mtab_file,
2062 // mp->mnt_fsname, mp->mnt_dir);
2064 // ...mount the last thing we found
2065 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2066 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2067 resolve_mount_spec(&mtpair->mnt_fsname);
2068 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2069 if (ENABLE_FEATURE_CLEAN_UP)
2070 free(mtcur->mnt_opts);
2075 if (ENABLE_FEATURE_CLEAN_UP)
2077 if (ENABLE_FEATURE_CLEAN_UP) {
2082 //TODO: exitcode should be ORed mask of (from "man mount"):
2084 // 1 incorrect invocation or permissions
2085 // 2 system error (out of memory, cannot fork, no more loop devices)
2086 // 4 internal mount bug or missing nfs support in mount
2088 //16 problems writing or locking /etc/mtab
2090 //64 some mount succeeded