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:rwanfvsiO:"
81 #if ENABLE_FEATURE_MTAB_SUPPORT
82 #define USE_MTAB (!(option_mask32 & OPT_n))
87 #if ENABLE_FEATURE_MOUNT_FAKE
88 #define FAKE_IT (option_mask32 & OPT_f)
93 #if ENABLE_FEATURE_MOUNT_HELPERS
94 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
96 #define HELPERS_ALLOWED 0
100 // TODO: more "user" flag compatibility.
101 // "user" option (from mount manpage):
102 // Only the user that mounted a filesystem can unmount it again.
103 // If any user should be able to unmount, then use users instead of user
104 // in the fstab line. The owner option is similar to the user option,
105 // with the restriction that the user must be the owner of the special file.
106 // This may be useful e.g. for /dev/fd if a login script makes
107 // the console user owner of this device.
109 // Standard mount options (from -o options or --options),
110 // with corresponding flags
111 static const int32_t mount_options[] = {
112 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
114 IF_FEATURE_MOUNT_LOOP(
118 IF_FEATURE_MOUNT_FSTAB(
120 /* "quiet" 0 - do not filter out, vfat wants to see it */
121 /* "noauto" */ MOUNT_NOAUTO,
122 /* "sw" */ MOUNT_SWAP,
123 /* "swap" */ MOUNT_SWAP,
124 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
125 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
129 IF_FEATURE_MOUNT_FLAGS(
131 /* "nosuid" */ MS_NOSUID,
132 /* "suid" */ ~MS_NOSUID,
133 /* "dev" */ ~MS_NODEV,
134 /* "nodev" */ MS_NODEV,
135 /* "exec" */ ~MS_NOEXEC,
136 /* "noexec" */ MS_NOEXEC,
137 /* "sync" */ MS_SYNCHRONOUS,
138 /* "dirsync" */ MS_DIRSYNC,
139 /* "async" */ ~MS_SYNCHRONOUS,
140 /* "atime" */ ~MS_NOATIME,
141 /* "noatime" */ MS_NOATIME,
142 /* "diratime" */ ~MS_NODIRATIME,
143 /* "nodiratime" */ MS_NODIRATIME,
144 /* "mand" */ MS_MANDLOCK,
145 /* "nomand" */ ~MS_MANDLOCK,
146 /* "relatime" */ MS_RELATIME,
147 /* "norelatime" */ ~MS_RELATIME,
148 /* "loud" */ ~MS_SILENT,
151 /* "bind" */ MS_BIND,
152 /* "move" */ MS_MOVE,
153 /* "shared" */ MS_SHARED,
154 /* "slave" */ MS_SLAVE,
155 /* "private" */ MS_PRIVATE,
156 /* "unbindable" */ MS_UNBINDABLE,
157 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
158 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
159 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
160 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
163 // Always understood.
164 /* "ro" */ MS_RDONLY, // vfs flag
165 /* "rw" */ ~MS_RDONLY, // vfs flag
166 /* "remount" */ MS_REMOUNT // action flag
169 static const char mount_option_str[] =
170 IF_FEATURE_MOUNT_LOOP(
173 IF_FEATURE_MOUNT_FSTAB(
175 // "quiet\0" - do not filter out, vfat wants to see it
180 IF_DESKTOP("users\0")
183 IF_FEATURE_MOUNT_FLAGS(
217 // Always understood.
220 "remount\0" // action flag
225 #if ENABLE_FEATURE_MOUNT_NFS
226 smalluint nfs_mount_version;
228 #if ENABLE_FEATURE_MOUNT_VERBOSE
232 char getmntent_buf[1];
235 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
236 #define G (*(struct globals*)&bb_common_bufsiz1)
237 #define nfs_mount_version (G.nfs_mount_version)
238 #if ENABLE_FEATURE_MOUNT_VERBOSE
239 #define verbose (G.verbose )
243 #define fslist (G.fslist )
244 #define getmntent_buf (G.getmntent_buf )
247 #if ENABLE_FEATURE_MOUNT_VERBOSE
248 static int verbose_mount(const char *source, const char *target,
249 const char *filesystemtype,
250 unsigned long mountflags, const void *data)
255 rc = mount(source, target, filesystemtype, mountflags, data);
257 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
258 source, target, filesystemtype,
259 mountflags, (char*)data, rc);
263 #define verbose_mount(...) mount(__VA_ARGS__)
266 #if ENABLE_FEATURE_MOUNT_LABEL
267 static void resolve_mount_spec(char **fsname)
271 if (!strncmp(*fsname, "UUID=", 5))
272 tmp = get_devname_from_uuid(*fsname + 5);
273 else if (!strncmp(*fsname, "LABEL=", 6))
274 tmp = get_devname_from_label(*fsname + 6);
280 #define resolve_mount_spec(fsname) ((void)0)
283 // Append mount options to string
284 static void append_mount_options(char **oldopts, const char *newopts)
286 if (*oldopts && **oldopts) {
287 // Do not insert options which are already there
290 int len = strlen(newopts);
291 p = strchr(newopts, ',');
292 if (p) len = p - newopts;
295 if (!strncmp(p, newopts, len)
296 && (p[len] == ',' || p[len] == '\0'))
302 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
307 while (newopts[0] == ',') newopts++;
310 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
311 *oldopts = xstrdup(newopts);
315 // Use the mount_options list to parse options into flags.
316 // Also return list of unrecognized options if unrecognized != NULL
317 static long parse_mount_options(char *options, char **unrecognized)
319 long flags = MS_SILENT;
321 // Loop through options
324 char *comma = strchr(options, ',');
325 const char *option_str = mount_option_str;
327 if (comma) *comma = '\0';
329 // FIXME: use hasmntopt()
330 // Find this option in mount_options
331 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
332 if (!strcasecmp(option_str, options)) {
333 long fl = mount_options[i];
334 if (fl < 0) flags &= fl;
338 option_str += strlen(option_str) + 1;
340 // If unrecognized not NULL, append unrecognized mount options
341 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
342 // Add it to strflags, to pass on to kernel
343 i = *unrecognized ? strlen(*unrecognized) : 0;
344 *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2);
346 // Comma separated if it's not the first one
347 if (i) (*unrecognized)[i++] = ',';
348 strcpy((*unrecognized)+i, options);
353 // Advance to next option
361 // Return a list of all block device backed filesystems
362 static llist_t *get_block_backed_filesystems(void)
364 static const char filesystems[2][sizeof("/proc/filesystems")] = {
369 llist_t *list = NULL;
373 for (i = 0; i < 2; i++) {
374 f = fopen_for_read(filesystems[i]);
377 while ((buf = xmalloc_fgetline(f)) != NULL) {
378 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
380 fs = skip_whitespace(buf);
381 if (*fs == '#' || *fs == '*' || !*fs)
384 llist_add_to_end(&list, xstrdup(fs));
387 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
393 #if ENABLE_FEATURE_CLEAN_UP
394 static void delete_block_backed_filesystems(void)
396 llist_free(fslist, free);
399 void delete_block_backed_filesystems(void);
402 // Perform actual mount of specific filesystem at specific location.
403 // NB: mp->xxx fields may be trashed on exit
404 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
410 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
411 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
412 vfsflags, filteropts);
416 // Mount, with fallback to read-only if necessary.
419 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
420 vfsflags, filteropts);
422 // If mount failed, try
423 // helper program mount.<mnt_type>
424 if (HELPERS_ALLOWED && rc) {
426 int errno_save = errno;
427 args[0] = xasprintf("mount.%s", mp->mnt_type);
430 args[rc++] = (char *)"-f";
431 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
432 args[rc++] = (char *)"-n";
433 args[rc++] = mp->mnt_fsname;
434 args[rc++] = mp->mnt_dir;
436 args[rc++] = (char *)"-o";
437 args[rc++] = filteropts;
440 rc = wait4pid(spawn(args));
447 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
449 if (!(vfsflags & MS_SILENT))
450 bb_error_msg("%s is write-protected, mounting read-only",
452 vfsflags |= MS_RDONLY;
455 // Abort entirely if permission denied.
457 if (rc && errno == EPERM)
458 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
460 // If the mount was successful, and we're maintaining an old-style
461 // mtab file by hand, add the new entry to it now.
463 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
465 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
466 const char *option_str = mount_option_str;
470 bb_error_msg("no %s", bb_path_mtab_file);
474 // Add vfs string flags
476 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
477 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
478 append_mount_options(&(mp->mnt_opts), option_str);
479 option_str += strlen(option_str) + 1;
482 // Remove trailing / (if any) from directory we mounted on
484 i = strlen(mp->mnt_dir) - 1;
485 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
487 // Convert to canonical pathnames as needed
489 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
491 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
492 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
493 mp->mnt_type = (char*)"bind";
495 mp->mnt_freq = mp->mnt_passno = 0;
499 addmntent(mountTable, mp);
500 endmntent(mountTable);
501 if (ENABLE_FEATURE_CLEAN_UP) {
510 #if ENABLE_FEATURE_MOUNT_NFS
514 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
516 * Licensed under GPLv2, see file LICENSE in this tarball for details.
518 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
519 * numbers to be specified on the command line.
521 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
522 * Omit the call to connect() for Linux version 1.3.11 or later.
524 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
525 * Implemented the "bg", "fg" and "retry" mount options for NFS.
527 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
528 * - added Native Language Support
530 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
534 /* This is just a warning of a common mistake. Possibly this should be a
535 * uclibc faq entry rather than in busybox... */
536 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
537 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
540 #define MOUNTPORT 635
541 #define MNTPATHLEN 1024
542 #define MNTNAMLEN 255
546 typedef char fhandle[FHSIZE];
549 unsigned int fhandle3_len;
561 MNT3ERR_NAMETOOLONG = 63,
562 MNT3ERR_NOTSUPP = 10004,
563 MNT3ERR_SERVERFAULT = 10006,
565 typedef enum mountstat3 mountstat3;
568 unsigned int fhs_status;
573 typedef struct fhstatus fhstatus;
575 struct mountres3_ok {
578 unsigned int auth_flavours_len;
579 char *auth_flavours_val;
582 typedef struct mountres3_ok mountres3_ok;
585 mountstat3 fhs_status;
587 mountres3_ok mountinfo;
590 typedef struct mountres3 mountres3;
592 typedef char *dirpath;
596 typedef struct mountbody *mountlist;
600 dirpath ml_directory;
603 typedef struct mountbody mountbody;
605 typedef struct groupnode *groups;
611 typedef struct groupnode groupnode;
613 typedef struct exportnode *exports;
620 typedef struct exportnode exportnode;
633 typedef struct ppathcnf ppathcnf;
635 #define MOUNTPROG 100005
638 #define MOUNTPROC_NULL 0
639 #define MOUNTPROC_MNT 1
640 #define MOUNTPROC_DUMP 2
641 #define MOUNTPROC_UMNT 3
642 #define MOUNTPROC_UMNTALL 4
643 #define MOUNTPROC_EXPORT 5
644 #define MOUNTPROC_EXPORTALL 6
646 #define MOUNTVERS_POSIX 2
648 #define MOUNTPROC_PATHCONF 7
652 #define MOUNTPROC3_NULL 0
653 #define MOUNTPROC3_MNT 1
654 #define MOUNTPROC3_DUMP 2
655 #define MOUNTPROC3_UMNT 3
656 #define MOUNTPROC3_UMNTALL 4
657 #define MOUNTPROC3_EXPORT 5
669 * We want to be able to compile mount on old kernels in such a way
670 * that the binary will work well on more recent kernels.
671 * Thus, if necessary we teach nfsmount.c the structure of new fields
672 * that will come later.
674 * Moreover, the new kernel includes conflict with glibc includes
675 * so it is easiest to ignore the kernel altogether (at compile time).
683 unsigned char data[64];
686 struct nfs_mount_data {
689 struct nfs2_fh old_root; /* 1 */
695 int acregmin; /* 1 */
696 int acregmax; /* 1 */
697 int acdirmin; /* 1 */
698 int acdirmax; /* 1 */
699 struct sockaddr_in addr; /* 1 */
700 char hostname[256]; /* 1 */
702 unsigned int bsize; /* 3 */
703 struct nfs3_fh root; /* 4 */
706 /* bits in the flags field */
708 NFS_MOUNT_SOFT = 0x0001, /* 1 */
709 NFS_MOUNT_INTR = 0x0002, /* 1 */
710 NFS_MOUNT_SECURE = 0x0004, /* 1 */
711 NFS_MOUNT_POSIX = 0x0008, /* 1 */
712 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
713 NFS_MOUNT_NOAC = 0x0020, /* 1 */
714 NFS_MOUNT_TCP = 0x0040, /* 2 */
715 NFS_MOUNT_VER3 = 0x0080, /* 3 */
716 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
717 NFS_MOUNT_NONLM = 0x0200, /* 3 */
718 NFS_MOUNT_NORDIRPLUS = 0x4000
723 * We need to translate between nfs status return values and
724 * the local errno values which may not be the same.
726 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
727 * "after #include <errno.h> the symbol errno is reserved for any use,
728 * it cannot even be used as a struct tag or field name".
732 #define EDQUOT ENOSPC
735 /* Convert each NFSERR_BLAH into EBLAH */
736 static const struct {
740 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
741 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
742 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
743 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
745 static char *nfs_strerror(int status)
749 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
750 if (nfs_errtbl[i].stat == status)
751 return strerror(nfs_errtbl[i].errnum);
753 return xasprintf("unknown nfs status return value: %d", status);
756 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
758 if (!xdr_opaque(xdrs, objp, FHSIZE))
763 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
765 if (!xdr_u_int(xdrs, &objp->fhs_status))
767 switch (objp->fhs_status) {
769 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
778 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
780 if (!xdr_string(xdrs, objp, MNTPATHLEN))
785 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
787 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
792 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
794 if (!xdr_fhandle3(xdrs, &objp->fhandle))
796 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
797 sizeof(int), (xdrproc_t) xdr_int))
802 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
804 if (!xdr_enum(xdrs, (enum_t *) objp))
809 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
811 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
813 switch (objp->fhs_status) {
815 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
824 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
827 * Unfortunately, the kernel prints annoying console messages
828 * in case of an unexpected nfs mount version (instead of
829 * just returning some error). Therefore we'll have to try
830 * and figure out what version the kernel expects.
833 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
834 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
835 * nfs_mount_version: version this source and running kernel can handle
838 find_kernel_nfs_mount_version(void)
842 if (nfs_mount_version)
845 nfs_mount_version = 4; /* default */
847 kernel_version = get_linux_version_code();
848 if (kernel_version) {
849 if (kernel_version < KERNEL_VERSION(2,1,32))
850 nfs_mount_version = 1;
851 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
852 (kernel_version >= KERNEL_VERSION(2,3,0) &&
853 kernel_version < KERNEL_VERSION(2,3,99)))
854 nfs_mount_version = 3;
855 /* else v4 since 2.3.99pre4 */
860 get_mountport(struct pmap *pm_mnt,
861 struct sockaddr_in *server_addr,
863 long unsigned version,
867 struct pmaplist *pmap;
869 server_addr->sin_port = PMAPPORT;
870 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
871 * I understand it like "IPv6 for this is not 100% ready" */
872 pmap = pmap_getmaps(server_addr);
874 if (version > MAX_NFSPROT)
875 version = MAX_NFSPROT;
878 pm_mnt->pm_prog = prog;
879 pm_mnt->pm_vers = version;
880 pm_mnt->pm_prot = proto;
881 pm_mnt->pm_port = port;
884 if (pmap->pml_map.pm_prog != prog)
886 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
888 if (version > 2 && pmap->pml_map.pm_vers != version)
890 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
892 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
893 (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) ||
894 (port && pmap->pml_map.pm_port != port))
896 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
898 pmap = pmap->pml_next;
900 if (!pm_mnt->pm_vers)
901 pm_mnt->pm_vers = MOUNTVERS;
902 if (!pm_mnt->pm_port)
903 pm_mnt->pm_port = MOUNTPORT;
904 if (!pm_mnt->pm_prot)
905 pm_mnt->pm_prot = IPPROTO_TCP;
909 static int daemonize(void)
912 if (pid < 0) /* error */
914 if (pid > 0) /* parent */
918 xopen(bb_dev_null, O_RDWR);
922 openlog(applet_name, LOG_PID, LOG_DAEMON);
923 logmode = LOGMODE_SYSLOG;
927 static inline int daemonize(void) { return -ENOSYS; }
931 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
936 /* RPC strerror analogs are terminally idiotic:
937 * *mandatory* prefix and \n at end.
938 * This hopefully helps. Usage:
939 * error_msg_rpc(clnt_*error*(" ")) */
940 static void error_msg_rpc(const char *msg)
943 while (msg[0] == ' ' || msg[0] == ':') msg++;
945 while (len && msg[len-1] == '\n') len--;
946 bb_error_msg("%.*s", len, msg);
949 /* NB: mp->xxx fields may be trashed on exit */
950 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
956 /* prior to 2.6.23, kernel took NFS options in a form of this struct
957 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
958 * then data pointer is interpreted as a string. */
959 struct nfs_mount_data data;
962 struct sockaddr_in server_addr;
963 struct sockaddr_in mount_server_addr;
966 struct fhstatus nfsv2;
967 struct mountres3 nfsv3;
985 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
995 find_kernel_nfs_mount_version();
1003 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1005 filteropts = xstrdup(filteropts); /* going to trash it later... */
1007 hostname = xstrdup(mp->mnt_fsname);
1008 /* mount_main() guarantees that ':' is there */
1009 s = strchr(hostname, ':');
1012 /* Ignore all but first hostname in replicated mounts
1013 until they can be fully supported. (mack@sgi.com) */
1014 s = strchr(hostname, ',');
1017 bb_error_msg("warning: multiple hostnames not supported");
1020 server_addr.sin_family = AF_INET;
1021 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1022 hp = gethostbyname(hostname);
1024 bb_herror_msg("%s", hostname);
1027 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1028 bb_error_msg("got bad hp->h_length");
1029 hp->h_length = sizeof(struct in_addr);
1031 memcpy(&server_addr.sin_addr,
1032 hp->h_addr, hp->h_length);
1035 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1037 /* add IP address to mtab options for use when unmounting */
1039 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1040 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1042 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1043 mp->mnt_opts[0] ? "," : "",
1044 inet_ntoa(server_addr.sin_addr));
1049 /* Set default options.
1050 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1051 * let the kernel decide.
1052 * timeo is filled in after we know whether it'll be TCP or UDP. */
1053 memset(&data, 0, sizeof(data));
1059 data.namlen = NAME_MAX;
1068 retry = 10000; /* 10000 minutes ~ 1 week */
1071 mountprog = MOUNTPROG;
1079 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1080 char *opteq = strchr(opt, '=');
1083 static const char options[] ALIGN1 =
1088 /* 4 */ "acregmin\0"
1089 /* 5 */ "acregmax\0"
1090 /* 6 */ "acdirmin\0"
1091 /* 7 */ "acdirmax\0"
1095 /* 11 */ "mountport\0"
1096 /* 12 */ "mounthost\0"
1097 /* 13 */ "mountprog\0"
1098 /* 14 */ "mountvers\0"
1099 /* 15 */ "nfsprog\0"
1100 /* 16 */ "nfsvers\0"
1107 idx = index_in_strings(options, opt);
1109 case 12: // "mounthost"
1110 mounthost = xstrndup(opteq,
1111 strcspn(opteq, " \t\n\r,"));
1114 if (!strncmp(opteq, "tcp", 3))
1116 else if (!strncmp(opteq, "udp", 3))
1119 bb_error_msg("warning: unrecognized proto= option");
1121 case 20: // "addr" - ignore
1125 val = xatoi_u(opteq);
1136 case 3: // "retrans"
1139 case 4: // "acregmin"
1140 data.acregmin = val;
1142 case 5: // "acregmax"
1143 data.acregmax = val;
1145 case 6: // "acdirmin"
1146 data.acdirmin = val;
1148 case 7: // "acdirmax"
1149 data.acdirmax = val;
1151 case 8: // "actimeo"
1152 data.acregmin = val;
1153 data.acregmax = val;
1154 data.acdirmin = val;
1155 data.acdirmax = val;
1163 case 11: // "mountport"
1166 case 13: // "mountprog"
1169 case 14: // "mountvers"
1172 case 15: // "nfsprog"
1175 case 16: // "nfsvers"
1179 case 19: // "namlen"
1180 //if (nfs_mount_version >= 2)
1183 // bb_error_msg("warning: option namlen is not supported\n");
1186 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1190 else { /* not of the form opt=val */
1191 static const char options[] ALIGN1 =
1205 if (!strncmp(opt, "no", 2)) {
1209 switch (index_in_strings(options, opt)) {
1245 if (nfs_mount_version >= 3)
1248 bb_error_msg("warning: option nolock is not supported");
1254 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1259 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1261 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1262 | (intr ? NFS_MOUNT_INTR : 0)
1263 | (posix ? NFS_MOUNT_POSIX : 0)
1264 | (nocto ? NFS_MOUNT_NOCTO : 0)
1265 | (noac ? NFS_MOUNT_NOAC : 0)
1266 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1267 if (nfs_mount_version >= 2)
1268 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1269 if (nfs_mount_version >= 3)
1270 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1271 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1272 bb_error_msg("NFSv%d not supported", nfsvers);
1275 if (nfsvers && !mountvers)
1276 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1277 if (nfsvers && nfsvers < mountvers) {
1278 mountvers = nfsvers;
1281 /* Adjust options if none specified */
1283 data.timeo = tcp ? 70 : 7;
1285 data.version = nfs_mount_version;
1287 if (vfsflags & MS_REMOUNT)
1291 * If the previous mount operation on the same host was
1292 * backgrounded, and the "bg" for this mount is also set,
1293 * give up immediately, to avoid the initial timeout.
1295 if (bg && we_saw_this_host_before(hostname)) {
1296 daemonized = daemonize();
1297 if (daemonized <= 0) { /* parent or error */
1298 retval = -daemonized;
1303 /* Create mount daemon client */
1304 /* See if the nfs host = mount host. */
1306 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1307 mount_server_addr.sin_family = AF_INET;
1308 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1310 hp = gethostbyname(mounthost);
1312 bb_herror_msg("%s", mounthost);
1315 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1316 bb_error_msg("got bad hp->h_length");
1317 hp->h_length = sizeof(struct in_addr);
1319 mount_server_addr.sin_family = AF_INET;
1320 memcpy(&mount_server_addr.sin_addr,
1321 hp->h_addr, hp->h_length);
1326 * The following loop implements the mount retries. When the mount
1327 * times out, and the "bg" option is set, we background ourself
1328 * and continue trying.
1330 * The case where the mount point is not present and the "bg"
1331 * option is set, is treated as a timeout. This is done to
1332 * support nested mounts.
1334 * The "retry" count specified by the user is the number of
1335 * minutes to retry before giving up.
1338 struct timeval total_timeout;
1339 struct timeval retry_timeout;
1345 retry_timeout.tv_sec = 3;
1346 retry_timeout.tv_usec = 0;
1347 total_timeout.tv_sec = 20;
1348 total_timeout.tv_usec = 0;
1349 /* FIXME: use monotonic()? */
1350 timeout = time(NULL) + 60 * retry;
1354 /* Be careful not to use too many CPU cycles */
1358 get_mountport(&pm_mnt, &mount_server_addr,
1363 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1365 /* contact the mount daemon via TCP */
1366 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1367 msock = RPC_ANYSOCK;
1369 switch (pm_mnt.pm_prot) {
1371 mclient = clntudp_create(&mount_server_addr,
1378 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1379 msock = RPC_ANYSOCK;
1381 mclient = clnttcp_create(&mount_server_addr,
1390 if (!daemonized && prevt == 0)
1391 error_msg_rpc(clnt_spcreateerror(" "));
1393 enum clnt_stat clnt_stat;
1395 /* Try to mount hostname:pathname */
1396 mclient->cl_auth = authunix_create_default();
1398 /* Make pointers in xdr_mountres3 NULL so
1399 * that xdr_array allocates memory for us
1401 memset(&status, 0, sizeof(status));
1403 if (pm_mnt.pm_vers == 3)
1404 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1405 (xdrproc_t) xdr_dirpath,
1406 (caddr_t) &pathname,
1407 (xdrproc_t) xdr_mountres3,
1411 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1412 (xdrproc_t) xdr_dirpath,
1413 (caddr_t) &pathname,
1414 (xdrproc_t) xdr_fhstatus,
1418 if (clnt_stat == RPC_SUCCESS)
1419 goto prepare_kernel_data; /* we're done */
1420 if (errno != ECONNREFUSED) {
1421 error_msg_rpc(clnt_sperror(mclient, " "));
1422 goto fail; /* don't retry */
1424 /* Connection refused */
1425 if (!daemonized && prevt == 0) /* print just once */
1426 error_msg_rpc(clnt_sperror(mclient, " "));
1427 auth_destroy(mclient->cl_auth);
1428 clnt_destroy(mclient);
1434 /* Timeout. We are going to retry... maybe */
1438 daemonized = daemonize();
1439 if (daemonized <= 0) { /* parent or error */
1440 retval = -daemonized;
1447 /* TODO error message */
1453 prepare_kernel_data:
1456 if (status.nfsv2.fhs_status != 0) {
1457 bb_error_msg("%s:%s failed, reason given by server: %s",
1459 nfs_strerror(status.nfsv2.fhs_status));
1462 memcpy(data.root.data,
1463 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1465 data.root.size = NFS_FHSIZE;
1466 memcpy(data.old_root.data,
1467 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1470 fhandle3 *my_fhandle;
1471 if (status.nfsv3.fhs_status != 0) {
1472 bb_error_msg("%s:%s failed, reason given by server: %s",
1474 nfs_strerror(status.nfsv3.fhs_status));
1477 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1478 memset(data.old_root.data, 0, NFS_FHSIZE);
1479 memset(&data.root, 0, sizeof(data.root));
1480 data.root.size = my_fhandle->fhandle3_len;
1481 memcpy(data.root.data,
1482 (char *) my_fhandle->fhandle3_val,
1483 my_fhandle->fhandle3_len);
1485 data.flags |= NFS_MOUNT_VER3;
1488 /* Create nfs socket for kernel */
1490 if (nfs_mount_version < 3) {
1491 bb_error_msg("NFS over TCP is not supported");
1494 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1496 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1498 bb_perror_msg("nfs socket");
1501 if (bindresvport(fsock, 0) < 0) {
1502 bb_perror_msg("nfs bindresvport");
1506 server_addr.sin_port = PMAPPORT;
1507 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1508 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1512 server_addr.sin_port = htons(port);
1514 /* Prepare data structure for kernel */
1516 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1517 strncpy(data.hostname, hostname, sizeof(data.hostname));
1520 auth_destroy(mclient->cl_auth);
1521 clnt_destroy(mclient);
1526 /* We must wait until mount directory is available */
1527 struct stat statbuf;
1529 while (stat(mp->mnt_dir, &statbuf) == -1) {
1531 daemonized = daemonize();
1532 if (daemonized <= 0) { /* parent or error */
1533 /* FIXME: parent doesn't close fsock - ??! */
1534 retval = -daemonized;
1538 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1545 /* Perform actual mount */
1547 mp->mnt_type = (char*)"nfs";
1548 retval = mount_it_now(mp, vfsflags, (char*)&data);
1555 auth_destroy(mclient->cl_auth);
1556 clnt_destroy(mclient);
1570 #else // !ENABLE_FEATURE_MOUNT_NFS
1572 // Never called. Call should be optimized out.
1573 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1575 #endif // !ENABLE_FEATURE_MOUNT_NFS
1577 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1578 // type detection. Returns 0 for success, nonzero for failure.
1579 // NB: mp->xxx fields may be trashed on exit
1580 static int singlemount(struct mntent *mp, int ignore_busy)
1584 char *loopFile = NULL, *filteropts = NULL;
1588 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1590 // Treat fstype "auto" as unspecified
1591 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1592 mp->mnt_type = NULL;
1594 // Might this be a virtual filesystem?
1595 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1599 // fsname: "cmd#arg1#arg2..."
1600 // WARNING: allows execution of arbitrary commands!
1601 // Try "mount 'sh#-c#sh' bogus_dir".
1602 // It is safe ONLY because non-root
1603 // cannot use two-argument mount command
1604 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1605 // "mount: can't find sh#-c#sh in /etc/fstab"
1606 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1611 while (*s && n < 35 - 2) {
1612 if (*s++ == '#' && *s != '#') {
1617 args[n++] = mp->mnt_dir;
1619 rc = wait4pid(xspawn(args));
1623 // Might this be an CIFS filesystem?
1624 if (ENABLE_FEATURE_MOUNT_CIFS
1625 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1626 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1627 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1629 #if 0 /* reported to break things */
1630 len_and_sockaddr *lsa;
1634 // Replace '/' with '\' and verify that unc points to "//server/share".
1635 for (s = mp->mnt_fsname; *s; ++s)
1636 if (*s == '/') *s = '\\';
1639 s = strrchr(mp->mnt_fsname, '\\');
1640 if (s <= mp->mnt_fsname+1)
1643 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1648 // Insert ip=... option into string flags.
1649 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1650 ip = xasprintf("ip=%s", dotted);
1651 parse_mount_options(ip, &filteropts);
1653 // Compose new unc '\\server-ip\share'
1654 // (s => slash after hostname)
1655 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1657 // Lock is required [why?]
1658 vfsflags |= MS_MANDLOCK;
1659 mp->mnt_type = (char*)"cifs";
1660 rc = mount_it_now(mp, vfsflags, filteropts);
1662 if (ENABLE_FEATURE_CLEAN_UP) {
1663 free(mp->mnt_fsname);
1672 // Might this be an NFS filesystem?
1673 if (ENABLE_FEATURE_MOUNT_NFS
1674 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1675 && strchr(mp->mnt_fsname, ':') != NULL
1677 rc = nfsmount(mp, vfsflags, filteropts);
1681 // Look at the file. (Not found isn't a failure for remount, or for
1682 // a synthetic filesystem like proc or sysfs.)
1683 // (We use stat, not lstat, in order to allow
1684 // mount symlink_to_file_or_blkdev dir)
1685 if (!stat(mp->mnt_fsname, &st)
1686 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1688 // Do we need to allocate a loopback device for it?
1689 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1690 loopFile = bb_simplify_path(mp->mnt_fsname);
1691 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1692 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1693 if (errno == EPERM || errno == EACCES)
1694 bb_error_msg(bb_msg_perm_denied_are_you_root);
1696 bb_perror_msg("cannot setup loop device");
1700 // Autodetect bind mounts
1701 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1702 vfsflags |= MS_BIND;
1705 // If we know the fstype (or don't need to), jump straight
1706 // to the actual mount.
1707 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1708 rc = mount_it_now(mp, vfsflags, filteropts);
1710 // Loop through filesystem types until mount succeeds
1713 // Initialize list of block backed filesystems. This has to be
1714 // done here so that during "mount -a", mounts after /proc shows up
1717 fslist = get_block_backed_filesystems();
1718 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1719 atexit(delete_block_backed_filesystems);
1722 for (fl = fslist; fl; fl = fl->link) {
1723 mp->mnt_type = fl->data;
1724 rc = mount_it_now(mp, vfsflags, filteropts);
1730 // If mount failed, clean up loop file (if any).
1731 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1732 del_loop(mp->mnt_fsname);
1733 if (ENABLE_FEATURE_CLEAN_UP) {
1735 free(mp->mnt_fsname);
1740 if (ENABLE_FEATURE_CLEAN_UP)
1743 if (errno == EBUSY && ignore_busy)
1746 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1751 * Unlike -t, -O should interpret "no" prefix differently:
1752 * -t noa,b,c = -t no(a,b,c) = mount all except fs'es with types a,b, and c
1753 * -O noa,b,c = -O noa,b,c = mount all with without option a,
1754 * or with option b or c.
1755 * But for now we do not support -O a,b,c at all (only -O a).
1757 * Another difference from -t support (match_fstype) is that
1758 * we need to examine the _list_ of options in fsopt, not just a string.
1760 static int match_opt(const char *fs_opt, const char *O_opt)
1768 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1773 len = strlen(O_opt);
1775 if (strncmp(fs_opt, O_opt, len) == 0
1776 && (fs_opt[len] == '\0' || fs_opt[len] == ',')
1780 fs_opt = strchr(fs_opt, ',');
1789 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1790 // each directory to be mounted.
1791 static const char must_be_root[] ALIGN1 = "you must be root";
1793 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1794 int mount_main(int argc UNUSED_PARAM, char **argv)
1796 char *cmdopts = xzalloc(1);
1797 char *fstype = NULL;
1798 char *O_optmatch = NULL;
1800 llist_t *lst_o = NULL;
1801 const char *fstabname;
1805 struct mntent mtpair[2], *mtcur = mtpair;
1806 IF_NOT_DESKTOP(const int nonroot = 0;)
1808 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1810 // Parse long options, like --bind and --move. Note that -o option
1811 // and --option are synonymous. Yes, this means --remount,rw works.
1812 for (i = j = 1; argv[i]; i++) {
1813 if (argv[i][0] == '-' && argv[i][1] == '-')
1814 append_mount_options(&cmdopts, argv[i] + 2);
1816 argv[j++] = argv[i];
1820 // Parse remaining options
1821 // Max 2 params; -o is a list, -v is a counter
1822 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1823 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1824 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1825 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1826 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1827 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1830 // If we have no arguments, show currently mounted filesystems
1832 if (!(opt & OPT_a)) {
1833 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1836 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1838 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1841 // Don't show rootfs. FIXME: why??
1842 // util-linux 2.12a happily shows rootfs...
1843 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1845 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1846 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1847 mtpair->mnt_dir, mtpair->mnt_type,
1850 if (ENABLE_FEATURE_CLEAN_UP)
1851 endmntent(mountTable);
1852 return EXIT_SUCCESS;
1854 storage_path = NULL;
1856 // When we have two arguments, the second is the directory and we can
1857 // skip looking at fstab entirely. We can always abspath() the directory
1858 // argument when we get it.
1861 bb_error_msg_and_die(must_be_root);
1862 mtpair->mnt_fsname = argv[0];
1863 mtpair->mnt_dir = argv[1];
1864 mtpair->mnt_type = fstype;
1865 mtpair->mnt_opts = cmdopts;
1866 resolve_mount_spec(&mtpair->mnt_fsname);
1867 rc = singlemount(mtpair, 0);
1870 storage_path = bb_simplify_path(argv[0]); // malloced
1873 // Past this point, we are handling either "mount -a [opts]"
1874 // or "mount [opts] single_param"
1876 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
1877 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1878 bb_error_msg_and_die(must_be_root);
1880 // If we have a shared subtree flag, don't worry about fstab or mtab.
1881 if (ENABLE_FEATURE_MOUNT_FLAGS
1882 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1884 // verbose_mount(source, target, type, flags, data)
1885 rc = verbose_mount("", argv[0], "", i, "");
1887 bb_simple_perror_msg_and_die(argv[0]);
1891 // Open either fstab or mtab
1892 fstabname = "/etc/fstab";
1893 if (i & MS_REMOUNT) {
1894 // WARNING. I am not sure this matches util-linux's
1895 // behavior. It's possible util-linux does not
1896 // take -o opts from mtab (takes only mount source).
1897 fstabname = bb_path_mtab_file;
1899 fstab = setmntent(fstabname, "r");
1901 bb_perror_msg_and_die("cannot read %s", fstabname);
1903 // Loop through entries until we find what we're looking for
1904 memset(mtpair, 0, sizeof(mtpair));
1906 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
1908 // Get next fstab entry
1909 if (!getmntent_r(fstab, mtcur, getmntent_buf
1910 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
1911 GETMNTENT_BUFSIZE/2)
1912 ) { // End of fstab/mtab is reached
1913 mtcur = mtother; // the thing we found last time
1917 // If we're trying to mount something specific and this isn't it,
1918 // skip it. Note we must match the exact text in fstab (ala
1919 // "proc") or a full path from root
1922 // Is this what we're looking for?
1923 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1924 strcmp(storage_path, mtcur->mnt_fsname) &&
1925 strcmp(argv[0], mtcur->mnt_dir) &&
1926 strcmp(storage_path, mtcur->mnt_dir)) continue;
1928 // Remember this entry. Something later may have
1929 // overmounted it, and we want the _last_ match.
1932 // If we're mounting all
1934 // No, mount -a won't mount anything,
1935 // even user mounts, for mere humans
1937 bb_error_msg_and_die(must_be_root);
1939 // Does type match? (NULL matches always)
1940 if (!match_fstype(mtcur, fstype))
1943 // Skip noauto and swap anyway.
1944 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
1945 // swap is bogus "fstype", parse_mount_options can't check fstypes
1946 || strcasecmp(mtcur->mnt_type, "swap") == 0
1951 // Does (at least one) option match?
1952 // (NULL matches always)
1953 if (!match_opt(mtcur->mnt_opts, O_optmatch))
1956 resolve_mount_spec(&mtcur->mnt_fsname);
1958 // NFS mounts want this to be xrealloc-able
1959 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
1962 if (singlemount(mtcur, 1)) {
1963 // Count number of failed mounts
1966 free(mtcur->mnt_opts);
1970 // End of fstab/mtab is reached.
1971 // Were we looking for something specific?
1975 // If we didn't find anything, complain
1976 if (!mtcur->mnt_fsname)
1977 bb_error_msg_and_die("can't find %s in %s",
1978 argv[0], fstabname);
1980 // What happens when we try to "mount swap_partition"?
1981 // (fstab containts "swap_partition swap swap defaults 0 0")
1982 // util-linux-ng 2.13.1 does this:
1983 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
1984 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
1985 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
1986 // write(2, "mount: mount point swap does not exist\n", 39) = 39
1987 // exit_group(32) = ?
1989 // In case we want to simply skip swap partitions:
1990 l = parse_mount_options(mtcur->mnt_opts, NULL);
1991 if ((l & MOUNT_SWAP)
1992 // swap is bogus "fstype", parse_mount_options can't check fstypes
1993 || strcasecmp(mtcur->mnt_type, "swap") == 0
1999 // fstab must have "users" or "user"
2000 l = parse_mount_options(mtcur->mnt_opts, NULL);
2001 if (!(l & MOUNT_USERS))
2002 bb_error_msg_and_die(must_be_root);
2005 // Mount the last thing we found
2006 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2007 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2008 resolve_mount_spec(&mtpair->mnt_fsname);
2009 rc = singlemount(mtcur, 0);
2010 if (ENABLE_FEATURE_CLEAN_UP)
2011 free(mtcur->mnt_opts);
2015 if (ENABLE_FEATURE_CLEAN_UP)
2017 if (ENABLE_FEATURE_CLEAN_UP) {