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>
69 #if ENABLE_FEATURE_MOUNT_NFS
70 /* This is just a warning of a common mistake. Possibly this should be a
71 * uclibc faq entry rather than in busybox... */
72 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
73 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
76 # include <rpc/pmap_prot.h>
77 # include <rpc/pmap_clnt.h>
81 #if defined(__dietlibc__)
82 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
83 // dietlibc-0.30 does not have implementation of getmntent_r()
84 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
85 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
87 struct mntent* ment = getmntent(stream);
88 return memcpy(result, ment, sizeof(*ment));
93 // Not real flags, but we want to be able to check for this.
95 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
96 MOUNT_NOAUTO = (1 << 29),
97 MOUNT_SWAP = (1 << 30),
101 #define OPTION_STR "o:t:rwanfvsiO:"
116 #if ENABLE_FEATURE_MTAB_SUPPORT
117 #define USE_MTAB (!(option_mask32 & OPT_n))
122 #if ENABLE_FEATURE_MOUNT_FAKE
123 #define FAKE_IT (option_mask32 & OPT_f)
128 #if ENABLE_FEATURE_MOUNT_HELPERS
129 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
131 #define HELPERS_ALLOWED 0
135 // TODO: more "user" flag compatibility.
136 // "user" option (from mount manpage):
137 // Only the user that mounted a filesystem can unmount it again.
138 // If any user should be able to unmount, then use users instead of user
139 // in the fstab line. The owner option is similar to the user option,
140 // with the restriction that the user must be the owner of the special file.
141 // This may be useful e.g. for /dev/fd if a login script makes
142 // the console user owner of this device.
144 // Standard mount options (from -o options or --options),
145 // with corresponding flags
146 static const int32_t mount_options[] = {
147 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
149 IF_FEATURE_MOUNT_LOOP(
153 IF_FEATURE_MOUNT_FSTAB(
155 /* "quiet" 0 - do not filter out, vfat wants to see it */
156 /* "noauto" */ MOUNT_NOAUTO,
157 /* "sw" */ MOUNT_SWAP,
158 /* "swap" */ MOUNT_SWAP,
159 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
160 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
164 IF_FEATURE_MOUNT_FLAGS(
166 /* "nosuid" */ MS_NOSUID,
167 /* "suid" */ ~MS_NOSUID,
168 /* "dev" */ ~MS_NODEV,
169 /* "nodev" */ MS_NODEV,
170 /* "exec" */ ~MS_NOEXEC,
171 /* "noexec" */ MS_NOEXEC,
172 /* "sync" */ MS_SYNCHRONOUS,
173 /* "dirsync" */ MS_DIRSYNC,
174 /* "async" */ ~MS_SYNCHRONOUS,
175 /* "atime" */ ~MS_NOATIME,
176 /* "noatime" */ MS_NOATIME,
177 /* "diratime" */ ~MS_NODIRATIME,
178 /* "nodiratime" */ MS_NODIRATIME,
179 /* "mand" */ MS_MANDLOCK,
180 /* "nomand" */ ~MS_MANDLOCK,
181 /* "relatime" */ MS_RELATIME,
182 /* "norelatime" */ ~MS_RELATIME,
183 /* "loud" */ ~MS_SILENT,
186 /* "union" */ MS_UNION,
187 /* "bind" */ MS_BIND,
188 /* "move" */ MS_MOVE,
189 /* "shared" */ MS_SHARED,
190 /* "slave" */ MS_SLAVE,
191 /* "private" */ MS_PRIVATE,
192 /* "unbindable" */ MS_UNBINDABLE,
193 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
194 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
195 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
196 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
199 // Always understood.
200 /* "ro" */ MS_RDONLY, // vfs flag
201 /* "rw" */ ~MS_RDONLY, // vfs flag
202 /* "remount" */ MS_REMOUNT // action flag
205 static const char mount_option_str[] =
206 IF_FEATURE_MOUNT_LOOP(
209 IF_FEATURE_MOUNT_FSTAB(
211 // "quiet\0" - do not filter out, vfat wants to see it
216 IF_DESKTOP("users\0")
219 IF_FEATURE_MOUNT_FLAGS(
254 // Always understood.
257 "remount\0" // action flag
262 #if ENABLE_FEATURE_MOUNT_NFS
263 smalluint nfs_mount_version;
265 #if ENABLE_FEATURE_MOUNT_VERBOSE
269 char getmntent_buf[1];
271 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
272 #define G (*(struct globals*)&bb_common_bufsiz1)
273 #define nfs_mount_version (G.nfs_mount_version)
274 #if ENABLE_FEATURE_MOUNT_VERBOSE
275 #define verbose (G.verbose )
279 #define fslist (G.fslist )
280 #define getmntent_buf (G.getmntent_buf )
283 #if ENABLE_FEATURE_MOUNT_VERBOSE
284 static int verbose_mount(const char *source, const char *target,
285 const char *filesystemtype,
286 unsigned long mountflags, const void *data)
291 rc = mount(source, target, filesystemtype, mountflags, data);
293 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
294 source, target, filesystemtype,
295 mountflags, (char*)data, rc);
299 #define verbose_mount(...) mount(__VA_ARGS__)
302 // Append mount options to string
303 static void append_mount_options(char **oldopts, const char *newopts)
305 if (*oldopts && **oldopts) {
306 // Do not insert options which are already there
309 int len = strlen(newopts);
310 p = strchr(newopts, ',');
311 if (p) len = p - newopts;
314 if (!strncmp(p, newopts, len)
315 && (p[len] == ',' || p[len] == '\0'))
321 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
326 while (newopts[0] == ',') newopts++;
329 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
330 *oldopts = xstrdup(newopts);
334 // Use the mount_options list to parse options into flags.
335 // Also return list of unrecognized options if unrecognized != NULL
336 static long parse_mount_options(char *options, char **unrecognized)
338 long flags = MS_SILENT;
340 // Loop through options
343 char *comma = strchr(options, ',');
344 const char *option_str = mount_option_str;
346 if (comma) *comma = '\0';
348 // FIXME: use hasmntopt()
349 // Find this option in mount_options
350 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
351 if (!strcasecmp(option_str, options)) {
352 long fl = mount_options[i];
353 if (fl < 0) flags &= fl;
357 option_str += strlen(option_str) + 1;
359 // If unrecognized not NULL, append unrecognized mount options
360 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
361 // Add it to strflags, to pass on to kernel
362 i = *unrecognized ? strlen(*unrecognized) : 0;
363 *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2);
365 // Comma separated if it's not the first one
366 if (i) (*unrecognized)[i++] = ',';
367 strcpy((*unrecognized)+i, options);
372 // Advance to next option
380 // Return a list of all block device backed filesystems
381 static llist_t *get_block_backed_filesystems(void)
383 static const char filesystems[2][sizeof("/proc/filesystems")] = {
388 llist_t *list = NULL;
392 for (i = 0; i < 2; i++) {
393 f = fopen_for_read(filesystems[i]);
396 while ((buf = xmalloc_fgetline(f)) != NULL) {
397 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
399 fs = skip_whitespace(buf);
400 if (*fs == '#' || *fs == '*' || !*fs)
403 llist_add_to_end(&list, xstrdup(fs));
406 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
412 #if ENABLE_FEATURE_CLEAN_UP
413 static void delete_block_backed_filesystems(void)
415 llist_free(fslist, free);
418 void delete_block_backed_filesystems(void);
421 // Perform actual mount of specific filesystem at specific location.
422 // NB: mp->xxx fields may be trashed on exit
423 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
429 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
430 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
431 vfsflags, filteropts);
435 // Mount, with fallback to read-only if necessary.
438 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
439 vfsflags, filteropts);
441 // If mount failed, try
442 // helper program mount.<mnt_type>
443 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
445 int errno_save = errno;
446 args[0] = xasprintf("mount.%s", mp->mnt_type);
449 args[rc++] = (char *)"-f";
450 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
451 args[rc++] = (char *)"-n";
452 args[rc++] = mp->mnt_fsname;
453 args[rc++] = mp->mnt_dir;
455 args[rc++] = (char *)"-o";
456 args[rc++] = filteropts;
459 rc = spawn_and_wait(args);
466 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
468 if (!(vfsflags & MS_SILENT))
469 bb_error_msg("%s is write-protected, mounting read-only",
471 vfsflags |= MS_RDONLY;
474 // Abort entirely if permission denied.
476 if (rc && errno == EPERM)
477 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
479 // If the mount was successful, and we're maintaining an old-style
480 // mtab file by hand, add the new entry to it now.
482 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
484 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
485 const char *option_str = mount_option_str;
489 bb_error_msg("no %s", bb_path_mtab_file);
493 // Add vfs string flags
495 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
496 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
497 append_mount_options(&(mp->mnt_opts), option_str);
498 option_str += strlen(option_str) + 1;
501 // Remove trailing / (if any) from directory we mounted on
503 i = strlen(mp->mnt_dir) - 1;
504 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
506 // Convert to canonical pathnames as needed
508 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
510 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
511 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
512 mp->mnt_type = (char*)"bind";
514 mp->mnt_freq = mp->mnt_passno = 0;
518 addmntent(mountTable, mp);
519 endmntent(mountTable);
520 if (ENABLE_FEATURE_CLEAN_UP) {
529 #if ENABLE_FEATURE_MOUNT_NFS
533 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
535 * Licensed under GPLv2, see file LICENSE in this tarball for details.
537 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
538 * numbers to be specified on the command line.
540 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
541 * Omit the call to connect() for Linux version 1.3.11 or later.
543 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
544 * Implemented the "bg", "fg" and "retry" mount options for NFS.
546 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
547 * - added Native Language Support
549 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
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".
744 # define EDQUOT ENOSPC
746 /* Convert each NFSERR_BLAH into EBLAH */
747 static const uint8_t nfs_err_stat[] = {
749 19, 20, 21, 22, 27, 28,
750 30, 63, 66, 69, 70, 71
752 static const uint8_t nfs_err_errnum[] = {
753 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
754 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
755 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
757 static char *nfs_strerror(int status)
761 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
762 if (nfs_err_stat[i] == status)
763 return strerror(nfs_err_errnum[i]);
765 return xasprintf("unknown nfs status return value: %d", status);
768 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
770 if (!xdr_opaque(xdrs, objp, FHSIZE))
775 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
777 if (!xdr_u_int(xdrs, &objp->fhs_status))
779 switch (objp->fhs_status) {
781 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
790 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
792 if (!xdr_string(xdrs, objp, MNTPATHLEN))
797 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
799 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
800 (unsigned int *) &objp->fhandle3_len,
808 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
810 if (!xdr_fhandle3(xdrs, &objp->fhandle))
812 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
813 &(objp->auth_flavours.auth_flavours_len),
823 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
825 if (!xdr_enum(xdrs, (enum_t *) objp))
830 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
832 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
834 switch (objp->fhs_status) {
836 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
845 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
848 * Unfortunately, the kernel prints annoying console messages
849 * in case of an unexpected nfs mount version (instead of
850 * just returning some error). Therefore we'll have to try
851 * and figure out what version the kernel expects.
854 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
855 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
856 * nfs_mount_version: version this source and running kernel can handle
859 find_kernel_nfs_mount_version(void)
863 if (nfs_mount_version)
866 nfs_mount_version = 4; /* default */
868 kernel_version = get_linux_version_code();
869 if (kernel_version) {
870 if (kernel_version < KERNEL_VERSION(2,2,18))
871 nfs_mount_version = 3;
872 /* else v4 since 2.3.99pre4 */
877 get_mountport(struct pmap *pm_mnt,
878 struct sockaddr_in *server_addr,
880 long unsigned version,
884 struct pmaplist *pmap;
886 server_addr->sin_port = PMAPPORT;
887 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
888 * I understand it like "IPv6 for this is not 100% ready" */
889 pmap = pmap_getmaps(server_addr);
891 if (version > MAX_NFSPROT)
892 version = MAX_NFSPROT;
895 pm_mnt->pm_prog = prog;
896 pm_mnt->pm_vers = version;
897 pm_mnt->pm_prot = proto;
898 pm_mnt->pm_port = port;
901 if (pmap->pml_map.pm_prog != prog)
903 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
905 if (version > 2 && pmap->pml_map.pm_vers != version)
907 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
909 if (pmap->pml_map.pm_vers > MAX_NFSPROT
910 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
911 || (port && pmap->pml_map.pm_port != port)
915 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
917 pmap = pmap->pml_next;
919 if (!pm_mnt->pm_vers)
920 pm_mnt->pm_vers = MOUNTVERS;
921 if (!pm_mnt->pm_port)
922 pm_mnt->pm_port = MOUNTPORT;
923 if (!pm_mnt->pm_prot)
924 pm_mnt->pm_prot = IPPROTO_TCP;
928 static int daemonize(void)
931 if (pid < 0) /* error */
933 if (pid > 0) /* parent */
937 xopen(bb_dev_null, O_RDWR);
941 openlog(applet_name, LOG_PID, LOG_DAEMON);
942 logmode = LOGMODE_SYSLOG;
946 static inline int daemonize(void) { return -ENOSYS; }
950 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
955 /* RPC strerror analogs are terminally idiotic:
956 * *mandatory* prefix and \n at end.
957 * This hopefully helps. Usage:
958 * error_msg_rpc(clnt_*error*(" ")) */
959 static void error_msg_rpc(const char *msg)
962 while (msg[0] == ' ' || msg[0] == ':') msg++;
964 while (len && msg[len-1] == '\n') len--;
965 bb_error_msg("%.*s", len, msg);
968 /* NB: mp->xxx fields may be trashed on exit */
969 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
975 /* prior to 2.6.23, kernel took NFS options in a form of this struct
976 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
977 * then data pointer is interpreted as a string. */
978 struct nfs_mount_data data;
981 struct sockaddr_in server_addr;
982 struct sockaddr_in mount_server_addr;
985 struct fhstatus nfsv2;
986 struct mountres3 nfsv3;
1004 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1014 find_kernel_nfs_mount_version();
1022 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1024 filteropts = xstrdup(filteropts); /* going to trash it later... */
1026 hostname = xstrdup(mp->mnt_fsname);
1027 /* mount_main() guarantees that ':' is there */
1028 s = strchr(hostname, ':');
1031 /* Ignore all but first hostname in replicated mounts
1032 until they can be fully supported. (mack@sgi.com) */
1033 s = strchr(hostname, ',');
1036 bb_error_msg("warning: multiple hostnames not supported");
1039 server_addr.sin_family = AF_INET;
1040 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1041 hp = gethostbyname(hostname);
1043 bb_herror_msg("%s", hostname);
1046 if (hp->h_length != (int)sizeof(struct in_addr)) {
1047 bb_error_msg_and_die("only IPv4 is supported");
1049 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1052 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1054 /* add IP address to mtab options for use when unmounting */
1056 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1057 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1059 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1060 mp->mnt_opts[0] ? "," : "",
1061 inet_ntoa(server_addr.sin_addr));
1066 /* Set default options.
1067 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1068 * let the kernel decide.
1069 * timeo is filled in after we know whether it'll be TCP or UDP. */
1070 memset(&data, 0, sizeof(data));
1076 data.namlen = NAME_MAX;
1085 retry = 10000; /* 10000 minutes ~ 1 week */
1088 mountprog = MOUNTPROG;
1096 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1097 char *opteq = strchr(opt, '=');
1100 static const char options[] ALIGN1 =
1105 /* 4 */ "acregmin\0"
1106 /* 5 */ "acregmax\0"
1107 /* 6 */ "acdirmin\0"
1108 /* 7 */ "acdirmax\0"
1112 /* 11 */ "mountport\0"
1113 /* 12 */ "mounthost\0"
1114 /* 13 */ "mountprog\0"
1115 /* 14 */ "mountvers\0"
1116 /* 15 */ "nfsprog\0"
1117 /* 16 */ "nfsvers\0"
1124 idx = index_in_strings(options, opt);
1126 case 12: // "mounthost"
1127 mounthost = xstrndup(opteq,
1128 strcspn(opteq, " \t\n\r,"));
1131 if (!strncmp(opteq, "tcp", 3))
1133 else if (!strncmp(opteq, "udp", 3))
1136 bb_error_msg("warning: unrecognized proto= option");
1138 case 20: // "addr" - ignore
1142 val = xatoi_u(opteq);
1153 case 3: // "retrans"
1156 case 4: // "acregmin"
1157 data.acregmin = val;
1159 case 5: // "acregmax"
1160 data.acregmax = val;
1162 case 6: // "acdirmin"
1163 data.acdirmin = val;
1165 case 7: // "acdirmax"
1166 data.acdirmax = val;
1168 case 8: // "actimeo"
1169 data.acregmin = val;
1170 data.acregmax = val;
1171 data.acdirmin = val;
1172 data.acdirmax = val;
1180 case 11: // "mountport"
1183 case 13: // "mountprog"
1186 case 14: // "mountvers"
1189 case 15: // "nfsprog"
1192 case 16: // "nfsvers"
1196 case 19: // "namlen"
1197 //if (nfs_mount_version >= 2)
1200 // bb_error_msg("warning: option namlen is not supported\n");
1203 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1207 else { /* not of the form opt=val */
1208 static const char options[] ALIGN1 =
1222 if (!strncmp(opt, "no", 2)) {
1226 switch (index_in_strings(options, opt)) {
1262 if (nfs_mount_version >= 3)
1265 bb_error_msg("warning: option nolock is not supported");
1271 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1276 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1278 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1279 | (intr ? NFS_MOUNT_INTR : 0)
1280 | (posix ? NFS_MOUNT_POSIX : 0)
1281 | (nocto ? NFS_MOUNT_NOCTO : 0)
1282 | (noac ? NFS_MOUNT_NOAC : 0)
1283 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1284 if (nfs_mount_version >= 2)
1285 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1286 if (nfs_mount_version >= 3)
1287 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1288 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1289 bb_error_msg("NFSv%d not supported", nfsvers);
1292 if (nfsvers && !mountvers)
1293 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1294 if (nfsvers && nfsvers < mountvers) {
1295 mountvers = nfsvers;
1298 /* Adjust options if none specified */
1300 data.timeo = tcp ? 70 : 7;
1302 data.version = nfs_mount_version;
1304 if (vfsflags & MS_REMOUNT)
1308 * If the previous mount operation on the same host was
1309 * backgrounded, and the "bg" for this mount is also set,
1310 * give up immediately, to avoid the initial timeout.
1312 if (bg && we_saw_this_host_before(hostname)) {
1313 daemonized = daemonize();
1314 if (daemonized <= 0) { /* parent or error */
1315 retval = -daemonized;
1320 /* Create mount daemon client */
1321 /* See if the nfs host = mount host. */
1323 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1324 mount_server_addr.sin_family = AF_INET;
1325 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1327 hp = gethostbyname(mounthost);
1329 bb_herror_msg("%s", mounthost);
1332 if (hp->h_length != (int)sizeof(struct in_addr)) {
1333 bb_error_msg_and_die("only IPv4 is supported");
1335 mount_server_addr.sin_family = AF_INET;
1336 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1341 * The following loop implements the mount retries. When the mount
1342 * times out, and the "bg" option is set, we background ourself
1343 * and continue trying.
1345 * The case where the mount point is not present and the "bg"
1346 * option is set, is treated as a timeout. This is done to
1347 * support nested mounts.
1349 * The "retry" count specified by the user is the number of
1350 * minutes to retry before giving up.
1353 struct timeval total_timeout;
1354 struct timeval retry_timeout;
1360 retry_timeout.tv_sec = 3;
1361 retry_timeout.tv_usec = 0;
1362 total_timeout.tv_sec = 20;
1363 total_timeout.tv_usec = 0;
1364 /* FIXME: use monotonic()? */
1365 timeout = time(NULL) + 60 * retry;
1369 /* Be careful not to use too many CPU cycles */
1373 get_mountport(&pm_mnt, &mount_server_addr,
1378 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1380 /* contact the mount daemon via TCP */
1381 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1382 msock = RPC_ANYSOCK;
1384 switch (pm_mnt.pm_prot) {
1386 mclient = clntudp_create(&mount_server_addr,
1393 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1394 msock = RPC_ANYSOCK;
1396 mclient = clnttcp_create(&mount_server_addr,
1405 if (!daemonized && prevt == 0)
1406 error_msg_rpc(clnt_spcreateerror(" "));
1408 enum clnt_stat clnt_stat;
1410 /* Try to mount hostname:pathname */
1411 mclient->cl_auth = authunix_create_default();
1413 /* Make pointers in xdr_mountres3 NULL so
1414 * that xdr_array allocates memory for us
1416 memset(&status, 0, sizeof(status));
1418 if (pm_mnt.pm_vers == 3)
1419 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1420 (xdrproc_t) xdr_dirpath,
1421 (caddr_t) &pathname,
1422 (xdrproc_t) xdr_mountres3,
1426 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1427 (xdrproc_t) xdr_dirpath,
1428 (caddr_t) &pathname,
1429 (xdrproc_t) xdr_fhstatus,
1433 if (clnt_stat == RPC_SUCCESS)
1434 goto prepare_kernel_data; /* we're done */
1435 if (errno != ECONNREFUSED) {
1436 error_msg_rpc(clnt_sperror(mclient, " "));
1437 goto fail; /* don't retry */
1439 /* Connection refused */
1440 if (!daemonized && prevt == 0) /* print just once */
1441 error_msg_rpc(clnt_sperror(mclient, " "));
1442 auth_destroy(mclient->cl_auth);
1443 clnt_destroy(mclient);
1449 /* Timeout. We are going to retry... maybe */
1453 daemonized = daemonize();
1454 if (daemonized <= 0) { /* parent or error */
1455 retval = -daemonized;
1462 /* TODO error message */
1468 prepare_kernel_data:
1471 if (status.nfsv2.fhs_status != 0) {
1472 bb_error_msg("%s:%s failed, reason given by server: %s",
1474 nfs_strerror(status.nfsv2.fhs_status));
1477 memcpy(data.root.data,
1478 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1480 data.root.size = NFS_FHSIZE;
1481 memcpy(data.old_root.data,
1482 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1485 fhandle3 *my_fhandle;
1486 if (status.nfsv3.fhs_status != 0) {
1487 bb_error_msg("%s:%s failed, reason given by server: %s",
1489 nfs_strerror(status.nfsv3.fhs_status));
1492 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1493 memset(data.old_root.data, 0, NFS_FHSIZE);
1494 memset(&data.root, 0, sizeof(data.root));
1495 data.root.size = my_fhandle->fhandle3_len;
1496 memcpy(data.root.data,
1497 (char *) my_fhandle->fhandle3_val,
1498 my_fhandle->fhandle3_len);
1500 data.flags |= NFS_MOUNT_VER3;
1503 /* Create nfs socket for kernel */
1505 if (nfs_mount_version < 3) {
1506 bb_error_msg("NFS over TCP is not supported");
1509 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1511 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1513 bb_perror_msg("nfs socket");
1516 if (bindresvport(fsock, 0) < 0) {
1517 bb_perror_msg("nfs bindresvport");
1521 server_addr.sin_port = PMAPPORT;
1522 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1523 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1527 server_addr.sin_port = htons(port);
1529 /* Prepare data structure for kernel */
1531 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1532 strncpy(data.hostname, hostname, sizeof(data.hostname));
1535 auth_destroy(mclient->cl_auth);
1536 clnt_destroy(mclient);
1541 /* We must wait until mount directory is available */
1542 struct stat statbuf;
1544 while (stat(mp->mnt_dir, &statbuf) == -1) {
1546 daemonized = daemonize();
1547 if (daemonized <= 0) { /* parent or error */
1548 /* FIXME: parent doesn't close fsock - ??! */
1549 retval = -daemonized;
1553 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1560 /* Perform actual mount */
1562 mp->mnt_type = (char*)"nfs";
1563 retval = mount_it_now(mp, vfsflags, (char*)&data);
1570 auth_destroy(mclient->cl_auth);
1571 clnt_destroy(mclient);
1585 #else // !ENABLE_FEATURE_MOUNT_NFS
1587 // Never called. Call should be optimized out.
1588 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1590 #endif // !ENABLE_FEATURE_MOUNT_NFS
1592 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1593 // type detection. Returns 0 for success, nonzero for failure.
1594 // NB: mp->xxx fields may be trashed on exit
1595 static int singlemount(struct mntent *mp, int ignore_busy)
1599 char *loopFile = NULL, *filteropts = NULL;
1605 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1607 // Treat fstype "auto" as unspecified
1608 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1609 mp->mnt_type = NULL;
1611 // Might this be a virtual filesystem?
1612 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1616 // fsname: "cmd#arg1#arg2..."
1617 // WARNING: allows execution of arbitrary commands!
1618 // Try "mount 'sh#-c#sh' bogus_dir".
1619 // It is safe ONLY because non-root
1620 // cannot use two-argument mount command
1621 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1622 // "mount: can't find sh#-c#sh in /etc/fstab"
1623 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1628 while (*s && n < 35 - 2) {
1629 if (*s++ == '#' && *s != '#') {
1634 args[n++] = mp->mnt_dir;
1636 rc = spawn_and_wait(args);
1640 // Might this be an CIFS filesystem?
1641 if (ENABLE_FEATURE_MOUNT_CIFS
1642 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1643 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1644 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1648 len_and_sockaddr *lsa;
1649 char *hostname, *dotted, *ip;
1651 hostname = mp->mnt_fsname + 2;
1652 len = strcspn(hostname, "/\\");
1653 if (len == 0 || hostname[len] == '\0')
1656 hostname[len] = '\0';
1657 lsa = host2sockaddr(hostname, 0);
1662 // Insert "ip=..." option into options
1663 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1664 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1665 ip = xasprintf("ip=%s", dotted);
1666 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1667 parse_mount_options(ip, &filteropts);
1668 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1670 // "-o mand" is required [why?]
1671 vfsflags |= MS_MANDLOCK;
1672 mp->mnt_type = (char*)"cifs";
1673 rc = mount_it_now(mp, vfsflags, filteropts);
1678 // Might this be an NFS filesystem?
1679 if (ENABLE_FEATURE_MOUNT_NFS
1680 && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0)
1681 && strchr(mp->mnt_fsname, ':') != NULL
1683 rc = nfsmount(mp, vfsflags, filteropts);
1687 // Look at the file. (Not found isn't a failure for remount, or for
1688 // a synthetic filesystem like proc or sysfs.)
1689 // (We use stat, not lstat, in order to allow
1690 // mount symlink_to_file_or_blkdev dir)
1691 if (!stat(mp->mnt_fsname, &st)
1692 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1694 // Do we need to allocate a loopback device for it?
1695 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1696 loopFile = bb_simplify_path(mp->mnt_fsname);
1697 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1698 if (set_loop(&mp->mnt_fsname, loopFile, 0) < 0) {
1699 if (errno == EPERM || errno == EACCES)
1700 bb_error_msg(bb_msg_perm_denied_are_you_root);
1702 bb_perror_msg("can't setup loop device");
1706 // Autodetect bind mounts
1707 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1708 vfsflags |= MS_BIND;
1711 // If we know the fstype (or don't need to), jump straight
1712 // to the actual mount.
1713 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1714 rc = mount_it_now(mp, vfsflags, filteropts);
1716 // Loop through filesystem types until mount succeeds
1719 // Initialize list of block backed filesystems.
1720 // This has to be done here so that during "mount -a",
1721 // mounts after /proc shows up can autodetect.
1723 fslist = get_block_backed_filesystems();
1724 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1725 atexit(delete_block_backed_filesystems);
1728 for (fl = fslist; fl; fl = fl->link) {
1729 mp->mnt_type = fl->data;
1730 rc = mount_it_now(mp, vfsflags, filteropts);
1736 // If mount failed, clean up loop file (if any).
1737 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1738 del_loop(mp->mnt_fsname);
1739 if (ENABLE_FEATURE_CLEAN_UP) {
1741 free(mp->mnt_fsname);
1746 if (ENABLE_FEATURE_CLEAN_UP)
1749 if (errno == EBUSY && ignore_busy)
1752 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1757 // -O interprets a list of filter options which select whether a mount
1758 // point will be mounted: only mounts with options matching *all* filtering
1759 // options will be selected.
1760 // By default each -O filter option must be present in the list of mount
1761 // options, but if it is prefixed by "no" then it must be absent.
1763 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1764 // (and also fails to match -o a because -o c is absent).
1766 // It is different from -t in that each option is matched exactly; a leading
1767 // "no" at the beginning of one option does not negate the rest.
1768 static int match_opt(const char *fs_opt_in, const char *O_opt)
1774 const char *fs_opt = fs_opt_in;
1778 // If option begins with "no" then treat as an inverted match:
1779 // matching is a failure
1781 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1785 // Isolate the current O option
1786 O_len = strchrnul(O_opt, ',') - O_opt;
1787 // Check for a match against existing options
1789 if (strncmp(fs_opt, O_opt, O_len) == 0
1790 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1793 return 0; // "no" prefix, but option found
1794 match = 1; // current O option found, go check next one
1797 fs_opt = strchr(fs_opt, ',');
1803 return 0; // match wanted but not found
1804 if (O_opt[O_len] == '\0') // end?
1806 // Step to the next O option
1809 // If we get here then everything matched
1813 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1814 // each directory to be mounted.
1815 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1816 int mount_main(int argc UNUSED_PARAM, char **argv)
1818 char *cmdopts = xzalloc(1);
1819 char *fstype = NULL;
1820 char *O_optmatch = NULL;
1822 llist_t *lst_o = NULL;
1823 const char *fstabname;
1826 int rc = EXIT_SUCCESS;
1828 struct mntent mtpair[2], *mtcur = mtpair;
1829 IF_NOT_DESKTOP(const int nonroot = 0;)
1831 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1833 // Parse long options, like --bind and --move. Note that -o option
1834 // and --option are synonymous. Yes, this means --remount,rw works.
1835 for (i = j = 1; argv[i]; i++) {
1836 if (argv[i][0] == '-' && argv[i][1] == '-')
1837 append_mount_options(&cmdopts, argv[i] + 2);
1839 argv[j++] = argv[i];
1843 // Parse remaining options
1844 // Max 2 params; -o is a list, -v is a counter
1845 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1846 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1847 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1848 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1849 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1850 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1853 // If we have no arguments, show currently mounted filesystems
1855 if (!(opt & OPT_a)) {
1856 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1859 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1861 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1864 // Don't show rootfs. FIXME: why??
1865 // util-linux 2.12a happily shows rootfs...
1866 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
1868 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
1869 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1870 mtpair->mnt_dir, mtpair->mnt_type,
1873 if (ENABLE_FEATURE_CLEAN_UP)
1874 endmntent(mountTable);
1875 return EXIT_SUCCESS;
1877 storage_path = NULL;
1879 // When we have two arguments, the second is the directory and we can
1880 // skip looking at fstab entirely. We can always abspath() the directory
1881 // argument when we get it.
1884 bb_error_msg_and_die(bb_msg_you_must_be_root);
1885 mtpair->mnt_fsname = argv[0];
1886 mtpair->mnt_dir = argv[1];
1887 mtpair->mnt_type = fstype;
1888 mtpair->mnt_opts = cmdopts;
1889 resolve_mount_spec(&mtpair->mnt_fsname);
1890 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
1893 storage_path = bb_simplify_path(argv[0]); // malloced
1896 // Past this point, we are handling either "mount -a [opts]"
1897 // or "mount [opts] single_param"
1899 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
1900 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1901 bb_error_msg_and_die(bb_msg_you_must_be_root);
1903 // If we have a shared subtree flag, don't worry about fstab or mtab.
1904 if (ENABLE_FEATURE_MOUNT_FLAGS
1905 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1907 // verbose_mount(source, target, type, flags, data)
1908 rc = verbose_mount("", argv[0], "", i, "");
1910 bb_simple_perror_msg_and_die(argv[0]);
1914 // Open either fstab or mtab
1915 fstabname = "/etc/fstab";
1916 if (i & MS_REMOUNT) {
1917 // WARNING. I am not sure this matches util-linux's
1918 // behavior. It's possible util-linux does not
1919 // take -o opts from mtab (takes only mount source).
1920 fstabname = bb_path_mtab_file;
1922 fstab = setmntent(fstabname, "r");
1924 bb_perror_msg_and_die("can't read '%s'", fstabname);
1926 // Loop through entries until we find what we're looking for
1927 memset(mtpair, 0, sizeof(mtpair));
1929 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
1931 // Get next fstab entry
1932 if (!getmntent_r(fstab, mtcur, getmntent_buf
1933 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
1934 GETMNTENT_BUFSIZE/2)
1935 ) { // End of fstab/mtab is reached
1936 mtcur = mtother; // the thing we found last time
1940 // If we're trying to mount something specific and this isn't it,
1941 // skip it. Note we must match the exact text in fstab (ala
1942 // "proc") or a full path from root
1945 // Is this what we're looking for?
1946 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
1947 && strcmp(storage_path, mtcur->mnt_fsname) != 0
1948 && strcmp(argv[0], mtcur->mnt_dir) != 0
1949 && strcmp(storage_path, mtcur->mnt_dir) != 0
1954 // Remember this entry. Something later may have
1955 // overmounted it, and we want the _last_ match.
1958 // If we're mounting all
1961 // No, mount -a won't mount anything,
1962 // even user mounts, for mere humans
1964 bb_error_msg_and_die(bb_msg_you_must_be_root);
1966 // Does type match? (NULL matches always)
1967 if (!match_fstype(mtcur, fstype))
1970 // Skip noauto and swap anyway
1971 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
1972 // swap is bogus "fstype", parse_mount_options can't check fstypes
1973 || strcasecmp(mtcur->mnt_type, "swap") == 0
1978 // Does (at least one) option match?
1979 // (NULL matches always)
1980 if (!match_opt(mtcur->mnt_opts, O_optmatch))
1983 resolve_mount_spec(&mtcur->mnt_fsname);
1985 // NFS mounts want this to be xrealloc-able
1986 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1988 // If nothing is mounted on this directory...
1989 // (otherwise repeated "mount -a" mounts everything again)
1990 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
1991 // We do not check fsname match of found mount point -
1992 // "/" may have fsname of "/dev/root" while fstab
1993 // says "/dev/something_else".
1996 bb_error_msg("according to %s, "
1997 "%s is already mounted on %s",
1999 mp->mnt_fsname, mp->mnt_dir);
2002 // ...mount this thing
2003 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2004 // Count number of failed mounts
2008 free(mtcur->mnt_opts);
2012 // End of fstab/mtab is reached.
2013 // Were we looking for something specific?
2014 if (argv[0]) { // yes
2017 // If we didn't find anything, complain
2018 if (!mtcur->mnt_fsname)
2019 bb_error_msg_and_die("can't find %s in %s",
2020 argv[0], fstabname);
2022 // What happens when we try to "mount swap_partition"?
2023 // (fstab containts "swap_partition swap swap defaults 0 0")
2024 // util-linux-ng 2.13.1 does this:
2025 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2026 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2027 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2028 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2029 // exit_group(32) = ?
2031 // In case we want to simply skip swap partitions:
2032 l = parse_mount_options(mtcur->mnt_opts, NULL);
2033 if ((l & MOUNT_SWAP)
2034 // swap is bogus "fstype", parse_mount_options can't check fstypes
2035 || strcasecmp(mtcur->mnt_type, "swap") == 0
2041 // fstab must have "users" or "user"
2042 l = parse_mount_options(mtcur->mnt_opts, NULL);
2043 if (!(l & MOUNT_USERS))
2044 bb_error_msg_and_die(bb_msg_you_must_be_root);
2047 //util-linux-2.12 does not do this check.
2048 //// If nothing is mounted on this directory...
2049 //// (otherwise repeated "mount FOO" mounts FOO again)
2050 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2052 // bb_error_msg("according to %s, "
2053 // "%s is already mounted on %s",
2054 // bb_path_mtab_file,
2055 // mp->mnt_fsname, mp->mnt_dir);
2057 // ...mount the last thing we found
2058 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2059 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2060 resolve_mount_spec(&mtpair->mnt_fsname);
2061 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2062 if (ENABLE_FEATURE_CLEAN_UP)
2063 free(mtcur->mnt_opts);
2068 if (ENABLE_FEATURE_CLEAN_UP)
2070 if (ENABLE_FEATURE_CLEAN_UP) {
2075 //TODO: exitcode should be ORed mask of (from "man mount"):
2077 // 1 incorrect invocation or permissions
2078 // 2 system error (out of memory, cannot fork, no more loop devices)
2079 // 4 internal mount bug or missing nfs support in mount
2081 //16 problems writing or locking /etc/mtab
2083 //64 some mount succeeded