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>
23 # define MS_BIND (1 << 12)
26 # define MS_MOVE (1 << 13)
29 # define MS_RECURSIVE (1 << 14)
32 # define MS_SILENT (1 << 15)
34 /* The shared subtree stuff, which went in around 2.6.15. */
36 # define MS_UNBINDABLE (1 << 17)
39 # define MS_PRIVATE (1 << 18)
42 # define MS_SLAVE (1 << 19)
45 # define MS_SHARED (1 << 20)
48 # define MS_RELATIME (1 << 21)
52 #if ENABLE_FEATURE_MOUNT_LABEL
53 #include "volume_id.h"
56 // Needed for nfs support only
57 #include <sys/utsname.h>
61 #include <rpc/pmap_prot.h>
62 #include <rpc/pmap_clnt.h>
65 #define MS_SILENT (1 << 15)
67 // Grab more as needed from util-linux's mount/mount_constants.h
69 #define MS_DIRSYNC 128 // Directory modifications are synchronous
73 #if defined(__dietlibc__)
74 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
75 // dietlibc-0.30 does not have implementation of getmntent_r()
76 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
77 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
79 struct mntent* ment = getmntent(stream);
80 return memcpy(result, ment, sizeof(*ment));
85 // Not real flags, but we want to be able to check for this.
87 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
88 MOUNT_NOAUTO = (1 << 29),
89 MOUNT_SWAP = (1 << 30),
93 #define OPTION_STR "o:t:rwanfvsiO:"
108 #if ENABLE_FEATURE_MTAB_SUPPORT
109 #define USE_MTAB (!(option_mask32 & OPT_n))
114 #if ENABLE_FEATURE_MOUNT_FAKE
115 #define FAKE_IT (option_mask32 & OPT_f)
120 #if ENABLE_FEATURE_MOUNT_HELPERS
121 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
123 #define HELPERS_ALLOWED 0
127 // TODO: more "user" flag compatibility.
128 // "user" option (from mount manpage):
129 // Only the user that mounted a filesystem can unmount it again.
130 // If any user should be able to unmount, then use users instead of user
131 // in the fstab line. The owner option is similar to the user option,
132 // with the restriction that the user must be the owner of the special file.
133 // This may be useful e.g. for /dev/fd if a login script makes
134 // the console user owner of this device.
136 // Standard mount options (from -o options or --options),
137 // with corresponding flags
138 static const int32_t mount_options[] = {
139 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
141 IF_FEATURE_MOUNT_LOOP(
145 IF_FEATURE_MOUNT_FSTAB(
147 /* "quiet" 0 - do not filter out, vfat wants to see it */
148 /* "noauto" */ MOUNT_NOAUTO,
149 /* "sw" */ MOUNT_SWAP,
150 /* "swap" */ MOUNT_SWAP,
151 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
152 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
156 IF_FEATURE_MOUNT_FLAGS(
158 /* "nosuid" */ MS_NOSUID,
159 /* "suid" */ ~MS_NOSUID,
160 /* "dev" */ ~MS_NODEV,
161 /* "nodev" */ MS_NODEV,
162 /* "exec" */ ~MS_NOEXEC,
163 /* "noexec" */ MS_NOEXEC,
164 /* "sync" */ MS_SYNCHRONOUS,
165 /* "dirsync" */ MS_DIRSYNC,
166 /* "async" */ ~MS_SYNCHRONOUS,
167 /* "atime" */ ~MS_NOATIME,
168 /* "noatime" */ MS_NOATIME,
169 /* "diratime" */ ~MS_NODIRATIME,
170 /* "nodiratime" */ MS_NODIRATIME,
171 /* "mand" */ MS_MANDLOCK,
172 /* "nomand" */ ~MS_MANDLOCK,
173 /* "relatime" */ MS_RELATIME,
174 /* "norelatime" */ ~MS_RELATIME,
175 /* "loud" */ ~MS_SILENT,
178 /* "bind" */ MS_BIND,
179 /* "move" */ MS_MOVE,
180 /* "shared" */ MS_SHARED,
181 /* "slave" */ MS_SLAVE,
182 /* "private" */ MS_PRIVATE,
183 /* "unbindable" */ MS_UNBINDABLE,
184 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
185 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
186 /* "rprivate" */ MS_SLAVE|MS_RECURSIVE,
187 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
190 // Always understood.
191 /* "ro" */ MS_RDONLY, // vfs flag
192 /* "rw" */ ~MS_RDONLY, // vfs flag
193 /* "remount" */ MS_REMOUNT // action flag
196 static const char mount_option_str[] =
197 IF_FEATURE_MOUNT_LOOP(
200 IF_FEATURE_MOUNT_FSTAB(
202 // "quiet\0" - do not filter out, vfat wants to see it
207 IF_DESKTOP("users\0")
210 IF_FEATURE_MOUNT_FLAGS(
244 // Always understood.
247 "remount\0" // action flag
252 #if ENABLE_FEATURE_MOUNT_NFS
253 smalluint nfs_mount_version;
255 #if ENABLE_FEATURE_MOUNT_VERBOSE
259 char getmntent_buf[1];
262 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
263 #define G (*(struct globals*)&bb_common_bufsiz1)
264 #define nfs_mount_version (G.nfs_mount_version)
265 #if ENABLE_FEATURE_MOUNT_VERBOSE
266 #define verbose (G.verbose )
270 #define fslist (G.fslist )
271 #define getmntent_buf (G.getmntent_buf )
274 #if ENABLE_FEATURE_MOUNT_VERBOSE
275 static int verbose_mount(const char *source, const char *target,
276 const char *filesystemtype,
277 unsigned long mountflags, const void *data)
282 rc = mount(source, target, filesystemtype, mountflags, data);
284 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
285 source, target, filesystemtype,
286 mountflags, (char*)data, rc);
290 #define verbose_mount(...) mount(__VA_ARGS__)
293 #if ENABLE_FEATURE_MOUNT_LABEL
294 static void resolve_mount_spec(char **fsname)
298 if (!strncmp(*fsname, "UUID=", 5))
299 tmp = get_devname_from_uuid(*fsname + 5);
300 else if (!strncmp(*fsname, "LABEL=", 6))
301 tmp = get_devname_from_label(*fsname + 6);
307 #define resolve_mount_spec(fsname) ((void)0)
310 // Append mount options to string
311 static void append_mount_options(char **oldopts, const char *newopts)
313 if (*oldopts && **oldopts) {
314 // Do not insert options which are already there
317 int len = strlen(newopts);
318 p = strchr(newopts, ',');
319 if (p) len = p - newopts;
322 if (!strncmp(p, newopts, len)
323 && (p[len] == ',' || p[len] == '\0'))
329 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
334 while (newopts[0] == ',') newopts++;
337 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
338 *oldopts = xstrdup(newopts);
342 // Use the mount_options list to parse options into flags.
343 // Also return list of unrecognized options if unrecognized != NULL
344 static long parse_mount_options(char *options, char **unrecognized)
346 long flags = MS_SILENT;
348 // Loop through options
351 char *comma = strchr(options, ',');
352 const char *option_str = mount_option_str;
354 if (comma) *comma = '\0';
356 // FIXME: use hasmntopt()
357 // Find this option in mount_options
358 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
359 if (!strcasecmp(option_str, options)) {
360 long fl = mount_options[i];
361 if (fl < 0) flags &= fl;
365 option_str += strlen(option_str) + 1;
367 // If unrecognized not NULL, append unrecognized mount options
368 if (unrecognized && i == ARRAY_SIZE(mount_options)) {
369 // Add it to strflags, to pass on to kernel
370 i = *unrecognized ? strlen(*unrecognized) : 0;
371 *unrecognized = xrealloc(*unrecognized, i + strlen(options) + 2);
373 // Comma separated if it's not the first one
374 if (i) (*unrecognized)[i++] = ',';
375 strcpy((*unrecognized)+i, options);
380 // Advance to next option
388 // Return a list of all block device backed filesystems
389 static llist_t *get_block_backed_filesystems(void)
391 static const char filesystems[2][sizeof("/proc/filesystems")] = {
396 llist_t *list = NULL;
400 for (i = 0; i < 2; i++) {
401 f = fopen_for_read(filesystems[i]);
404 while ((buf = xmalloc_fgetline(f)) != NULL) {
405 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
407 fs = skip_whitespace(buf);
408 if (*fs == '#' || *fs == '*' || !*fs)
411 llist_add_to_end(&list, xstrdup(fs));
414 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
420 #if ENABLE_FEATURE_CLEAN_UP
421 static void delete_block_backed_filesystems(void)
423 llist_free(fslist, free);
426 void delete_block_backed_filesystems(void);
429 // Perform actual mount of specific filesystem at specific location.
430 // NB: mp->xxx fields may be trashed on exit
431 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
437 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
438 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
439 vfsflags, filteropts);
443 // Mount, with fallback to read-only if necessary.
446 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
447 vfsflags, filteropts);
449 // If mount failed, try
450 // helper program mount.<mnt_type>
451 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
453 int errno_save = errno;
454 args[0] = xasprintf("mount.%s", mp->mnt_type);
457 args[rc++] = (char *)"-f";
458 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
459 args[rc++] = (char *)"-n";
460 args[rc++] = mp->mnt_fsname;
461 args[rc++] = mp->mnt_dir;
463 args[rc++] = (char *)"-o";
464 args[rc++] = filteropts;
467 rc = wait4pid(spawn(args));
474 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
476 if (!(vfsflags & MS_SILENT))
477 bb_error_msg("%s is write-protected, mounting read-only",
479 vfsflags |= MS_RDONLY;
482 // Abort entirely if permission denied.
484 if (rc && errno == EPERM)
485 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
487 // If the mount was successful, and we're maintaining an old-style
488 // mtab file by hand, add the new entry to it now.
490 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
492 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
493 const char *option_str = mount_option_str;
497 bb_error_msg("no %s", bb_path_mtab_file);
501 // Add vfs string flags
503 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
504 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
505 append_mount_options(&(mp->mnt_opts), option_str);
506 option_str += strlen(option_str) + 1;
509 // Remove trailing / (if any) from directory we mounted on
511 i = strlen(mp->mnt_dir) - 1;
512 if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
514 // Convert to canonical pathnames as needed
516 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
518 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
519 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
520 mp->mnt_type = (char*)"bind";
522 mp->mnt_freq = mp->mnt_passno = 0;
526 addmntent(mountTable, mp);
527 endmntent(mountTable);
528 if (ENABLE_FEATURE_CLEAN_UP) {
537 #if ENABLE_FEATURE_MOUNT_NFS
541 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
543 * Licensed under GPLv2, see file LICENSE in this tarball for details.
545 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
546 * numbers to be specified on the command line.
548 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
549 * Omit the call to connect() for Linux version 1.3.11 or later.
551 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
552 * Implemented the "bg", "fg" and "retry" mount options for NFS.
554 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
555 * - added Native Language Support
557 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
561 /* This is just a warning of a common mistake. Possibly this should be a
562 * uclibc faq entry rather than in busybox... */
563 #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
564 #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
567 #define MOUNTPORT 635
568 #define MNTPATHLEN 1024
569 #define MNTNAMLEN 255
573 typedef char fhandle[FHSIZE];
576 unsigned int fhandle3_len;
588 MNT3ERR_NAMETOOLONG = 63,
589 MNT3ERR_NOTSUPP = 10004,
590 MNT3ERR_SERVERFAULT = 10006,
592 typedef enum mountstat3 mountstat3;
595 unsigned int fhs_status;
600 typedef struct fhstatus fhstatus;
602 struct mountres3_ok {
605 unsigned int auth_flavours_len;
606 char *auth_flavours_val;
609 typedef struct mountres3_ok mountres3_ok;
612 mountstat3 fhs_status;
614 mountres3_ok mountinfo;
617 typedef struct mountres3 mountres3;
619 typedef char *dirpath;
623 typedef struct mountbody *mountlist;
627 dirpath ml_directory;
630 typedef struct mountbody mountbody;
632 typedef struct groupnode *groups;
638 typedef struct groupnode groupnode;
640 typedef struct exportnode *exports;
647 typedef struct exportnode exportnode;
660 typedef struct ppathcnf ppathcnf;
662 #define MOUNTPROG 100005
665 #define MOUNTPROC_NULL 0
666 #define MOUNTPROC_MNT 1
667 #define MOUNTPROC_DUMP 2
668 #define MOUNTPROC_UMNT 3
669 #define MOUNTPROC_UMNTALL 4
670 #define MOUNTPROC_EXPORT 5
671 #define MOUNTPROC_EXPORTALL 6
673 #define MOUNTVERS_POSIX 2
675 #define MOUNTPROC_PATHCONF 7
679 #define MOUNTPROC3_NULL 0
680 #define MOUNTPROC3_MNT 1
681 #define MOUNTPROC3_DUMP 2
682 #define MOUNTPROC3_UMNT 3
683 #define MOUNTPROC3_UMNTALL 4
684 #define MOUNTPROC3_EXPORT 5
696 * We want to be able to compile mount on old kernels in such a way
697 * that the binary will work well on more recent kernels.
698 * Thus, if necessary we teach nfsmount.c the structure of new fields
699 * that will come later.
701 * Moreover, the new kernel includes conflict with glibc includes
702 * so it is easiest to ignore the kernel altogether (at compile time).
710 unsigned char data[64];
713 struct nfs_mount_data {
716 struct nfs2_fh old_root; /* 1 */
722 int acregmin; /* 1 */
723 int acregmax; /* 1 */
724 int acdirmin; /* 1 */
725 int acdirmax; /* 1 */
726 struct sockaddr_in addr; /* 1 */
727 char hostname[256]; /* 1 */
729 unsigned int bsize; /* 3 */
730 struct nfs3_fh root; /* 4 */
733 /* bits in the flags field */
735 NFS_MOUNT_SOFT = 0x0001, /* 1 */
736 NFS_MOUNT_INTR = 0x0002, /* 1 */
737 NFS_MOUNT_SECURE = 0x0004, /* 1 */
738 NFS_MOUNT_POSIX = 0x0008, /* 1 */
739 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
740 NFS_MOUNT_NOAC = 0x0020, /* 1 */
741 NFS_MOUNT_TCP = 0x0040, /* 2 */
742 NFS_MOUNT_VER3 = 0x0080, /* 3 */
743 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
744 NFS_MOUNT_NONLM = 0x0200, /* 3 */
745 NFS_MOUNT_NORDIRPLUS = 0x4000
750 * We need to translate between nfs status return values and
751 * the local errno values which may not be the same.
753 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
754 * "after #include <errno.h> the symbol errno is reserved for any use,
755 * it cannot even be used as a struct tag or field name".
759 #define EDQUOT ENOSPC
762 /* Convert each NFSERR_BLAH into EBLAH */
763 static const struct {
767 {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
768 {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
769 {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
770 {70,ESTALE}, {71,EREMOTE}, {-1,EIO}
772 static char *nfs_strerror(int status)
776 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
777 if (nfs_errtbl[i].stat == status)
778 return strerror(nfs_errtbl[i].errnum);
780 return xasprintf("unknown nfs status return value: %d", status);
783 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
785 if (!xdr_opaque(xdrs, objp, FHSIZE))
790 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
792 if (!xdr_u_int(xdrs, &objp->fhs_status))
794 switch (objp->fhs_status) {
796 if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
805 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
807 if (!xdr_string(xdrs, objp, MNTPATHLEN))
812 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
814 if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
819 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
821 if (!xdr_fhandle3(xdrs, &objp->fhandle))
823 if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
824 sizeof(int), (xdrproc_t) xdr_int))
829 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
831 if (!xdr_enum(xdrs, (enum_t *) objp))
836 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
838 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
840 switch (objp->fhs_status) {
842 if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
851 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
854 * Unfortunately, the kernel prints annoying console messages
855 * in case of an unexpected nfs mount version (instead of
856 * just returning some error). Therefore we'll have to try
857 * and figure out what version the kernel expects.
860 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
861 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
862 * nfs_mount_version: version this source and running kernel can handle
865 find_kernel_nfs_mount_version(void)
869 if (nfs_mount_version)
872 nfs_mount_version = 4; /* default */
874 kernel_version = get_linux_version_code();
875 if (kernel_version) {
876 if (kernel_version < KERNEL_VERSION(2,1,32))
877 nfs_mount_version = 1;
878 else if (kernel_version < KERNEL_VERSION(2,2,18) ||
879 (kernel_version >= KERNEL_VERSION(2,3,0) &&
880 kernel_version < KERNEL_VERSION(2,3,99)))
881 nfs_mount_version = 3;
882 /* else v4 since 2.3.99pre4 */
887 get_mountport(struct pmap *pm_mnt,
888 struct sockaddr_in *server_addr,
890 long unsigned version,
894 struct pmaplist *pmap;
896 server_addr->sin_port = PMAPPORT;
897 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
898 * I understand it like "IPv6 for this is not 100% ready" */
899 pmap = pmap_getmaps(server_addr);
901 if (version > MAX_NFSPROT)
902 version = MAX_NFSPROT;
905 pm_mnt->pm_prog = prog;
906 pm_mnt->pm_vers = version;
907 pm_mnt->pm_prot = proto;
908 pm_mnt->pm_port = port;
911 if (pmap->pml_map.pm_prog != prog)
913 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
915 if (version > 2 && pmap->pml_map.pm_vers != version)
917 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
919 if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
920 (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto) ||
921 (port && pmap->pml_map.pm_port != port))
923 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
925 pmap = pmap->pml_next;
927 if (!pm_mnt->pm_vers)
928 pm_mnt->pm_vers = MOUNTVERS;
929 if (!pm_mnt->pm_port)
930 pm_mnt->pm_port = MOUNTPORT;
931 if (!pm_mnt->pm_prot)
932 pm_mnt->pm_prot = IPPROTO_TCP;
936 static int daemonize(void)
939 if (pid < 0) /* error */
941 if (pid > 0) /* parent */
945 xopen(bb_dev_null, O_RDWR);
949 openlog(applet_name, LOG_PID, LOG_DAEMON);
950 logmode = LOGMODE_SYSLOG;
954 static inline int daemonize(void) { return -ENOSYS; }
958 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
963 /* RPC strerror analogs are terminally idiotic:
964 * *mandatory* prefix and \n at end.
965 * This hopefully helps. Usage:
966 * error_msg_rpc(clnt_*error*(" ")) */
967 static void error_msg_rpc(const char *msg)
970 while (msg[0] == ' ' || msg[0] == ':') msg++;
972 while (len && msg[len-1] == '\n') len--;
973 bb_error_msg("%.*s", len, msg);
976 /* NB: mp->xxx fields may be trashed on exit */
977 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
983 /* prior to 2.6.23, kernel took NFS options in a form of this struct
984 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
985 * then data pointer is interpreted as a string. */
986 struct nfs_mount_data data;
989 struct sockaddr_in server_addr;
990 struct sockaddr_in mount_server_addr;
993 struct fhstatus nfsv2;
994 struct mountres3 nfsv3;
1012 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1022 find_kernel_nfs_mount_version();
1030 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1032 filteropts = xstrdup(filteropts); /* going to trash it later... */
1034 hostname = xstrdup(mp->mnt_fsname);
1035 /* mount_main() guarantees that ':' is there */
1036 s = strchr(hostname, ':');
1039 /* Ignore all but first hostname in replicated mounts
1040 until they can be fully supported. (mack@sgi.com) */
1041 s = strchr(hostname, ',');
1044 bb_error_msg("warning: multiple hostnames not supported");
1047 server_addr.sin_family = AF_INET;
1048 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1049 hp = gethostbyname(hostname);
1051 bb_herror_msg("%s", hostname);
1054 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1055 bb_error_msg("got bad hp->h_length");
1056 hp->h_length = sizeof(struct in_addr);
1058 memcpy(&server_addr.sin_addr,
1059 hp->h_addr, hp->h_length);
1062 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1064 /* add IP address to mtab options for use when unmounting */
1066 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1067 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1069 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1070 mp->mnt_opts[0] ? "," : "",
1071 inet_ntoa(server_addr.sin_addr));
1076 /* Set default options.
1077 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1078 * let the kernel decide.
1079 * timeo is filled in after we know whether it'll be TCP or UDP. */
1080 memset(&data, 0, sizeof(data));
1086 data.namlen = NAME_MAX;
1095 retry = 10000; /* 10000 minutes ~ 1 week */
1098 mountprog = MOUNTPROG;
1106 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1107 char *opteq = strchr(opt, '=');
1110 static const char options[] ALIGN1 =
1115 /* 4 */ "acregmin\0"
1116 /* 5 */ "acregmax\0"
1117 /* 6 */ "acdirmin\0"
1118 /* 7 */ "acdirmax\0"
1122 /* 11 */ "mountport\0"
1123 /* 12 */ "mounthost\0"
1124 /* 13 */ "mountprog\0"
1125 /* 14 */ "mountvers\0"
1126 /* 15 */ "nfsprog\0"
1127 /* 16 */ "nfsvers\0"
1134 idx = index_in_strings(options, opt);
1136 case 12: // "mounthost"
1137 mounthost = xstrndup(opteq,
1138 strcspn(opteq, " \t\n\r,"));
1141 if (!strncmp(opteq, "tcp", 3))
1143 else if (!strncmp(opteq, "udp", 3))
1146 bb_error_msg("warning: unrecognized proto= option");
1148 case 20: // "addr" - ignore
1152 val = xatoi_u(opteq);
1163 case 3: // "retrans"
1166 case 4: // "acregmin"
1167 data.acregmin = val;
1169 case 5: // "acregmax"
1170 data.acregmax = val;
1172 case 6: // "acdirmin"
1173 data.acdirmin = val;
1175 case 7: // "acdirmax"
1176 data.acdirmax = val;
1178 case 8: // "actimeo"
1179 data.acregmin = val;
1180 data.acregmax = val;
1181 data.acdirmin = val;
1182 data.acdirmax = val;
1190 case 11: // "mountport"
1193 case 13: // "mountprog"
1196 case 14: // "mountvers"
1199 case 15: // "nfsprog"
1202 case 16: // "nfsvers"
1206 case 19: // "namlen"
1207 //if (nfs_mount_version >= 2)
1210 // bb_error_msg("warning: option namlen is not supported\n");
1213 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1217 else { /* not of the form opt=val */
1218 static const char options[] ALIGN1 =
1232 if (!strncmp(opt, "no", 2)) {
1236 switch (index_in_strings(options, opt)) {
1272 if (nfs_mount_version >= 3)
1275 bb_error_msg("warning: option nolock is not supported");
1281 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1286 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1288 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1289 | (intr ? NFS_MOUNT_INTR : 0)
1290 | (posix ? NFS_MOUNT_POSIX : 0)
1291 | (nocto ? NFS_MOUNT_NOCTO : 0)
1292 | (noac ? NFS_MOUNT_NOAC : 0)
1293 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1294 if (nfs_mount_version >= 2)
1295 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1296 if (nfs_mount_version >= 3)
1297 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1298 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1299 bb_error_msg("NFSv%d not supported", nfsvers);
1302 if (nfsvers && !mountvers)
1303 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1304 if (nfsvers && nfsvers < mountvers) {
1305 mountvers = nfsvers;
1308 /* Adjust options if none specified */
1310 data.timeo = tcp ? 70 : 7;
1312 data.version = nfs_mount_version;
1314 if (vfsflags & MS_REMOUNT)
1318 * If the previous mount operation on the same host was
1319 * backgrounded, and the "bg" for this mount is also set,
1320 * give up immediately, to avoid the initial timeout.
1322 if (bg && we_saw_this_host_before(hostname)) {
1323 daemonized = daemonize();
1324 if (daemonized <= 0) { /* parent or error */
1325 retval = -daemonized;
1330 /* Create mount daemon client */
1331 /* See if the nfs host = mount host. */
1333 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1334 mount_server_addr.sin_family = AF_INET;
1335 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1337 hp = gethostbyname(mounthost);
1339 bb_herror_msg("%s", mounthost);
1342 if ((size_t)hp->h_length > sizeof(struct in_addr)) {
1343 bb_error_msg("got bad hp->h_length");
1344 hp->h_length = sizeof(struct in_addr);
1346 mount_server_addr.sin_family = AF_INET;
1347 memcpy(&mount_server_addr.sin_addr,
1348 hp->h_addr, hp->h_length);
1353 * The following loop implements the mount retries. When the mount
1354 * times out, and the "bg" option is set, we background ourself
1355 * and continue trying.
1357 * The case where the mount point is not present and the "bg"
1358 * option is set, is treated as a timeout. This is done to
1359 * support nested mounts.
1361 * The "retry" count specified by the user is the number of
1362 * minutes to retry before giving up.
1365 struct timeval total_timeout;
1366 struct timeval retry_timeout;
1372 retry_timeout.tv_sec = 3;
1373 retry_timeout.tv_usec = 0;
1374 total_timeout.tv_sec = 20;
1375 total_timeout.tv_usec = 0;
1376 /* FIXME: use monotonic()? */
1377 timeout = time(NULL) + 60 * retry;
1381 /* Be careful not to use too many CPU cycles */
1385 get_mountport(&pm_mnt, &mount_server_addr,
1390 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1392 /* contact the mount daemon via TCP */
1393 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1394 msock = RPC_ANYSOCK;
1396 switch (pm_mnt.pm_prot) {
1398 mclient = clntudp_create(&mount_server_addr,
1405 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1406 msock = RPC_ANYSOCK;
1408 mclient = clnttcp_create(&mount_server_addr,
1417 if (!daemonized && prevt == 0)
1418 error_msg_rpc(clnt_spcreateerror(" "));
1420 enum clnt_stat clnt_stat;
1422 /* Try to mount hostname:pathname */
1423 mclient->cl_auth = authunix_create_default();
1425 /* Make pointers in xdr_mountres3 NULL so
1426 * that xdr_array allocates memory for us
1428 memset(&status, 0, sizeof(status));
1430 if (pm_mnt.pm_vers == 3)
1431 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1432 (xdrproc_t) xdr_dirpath,
1433 (caddr_t) &pathname,
1434 (xdrproc_t) xdr_mountres3,
1438 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1439 (xdrproc_t) xdr_dirpath,
1440 (caddr_t) &pathname,
1441 (xdrproc_t) xdr_fhstatus,
1445 if (clnt_stat == RPC_SUCCESS)
1446 goto prepare_kernel_data; /* we're done */
1447 if (errno != ECONNREFUSED) {
1448 error_msg_rpc(clnt_sperror(mclient, " "));
1449 goto fail; /* don't retry */
1451 /* Connection refused */
1452 if (!daemonized && prevt == 0) /* print just once */
1453 error_msg_rpc(clnt_sperror(mclient, " "));
1454 auth_destroy(mclient->cl_auth);
1455 clnt_destroy(mclient);
1461 /* Timeout. We are going to retry... maybe */
1465 daemonized = daemonize();
1466 if (daemonized <= 0) { /* parent or error */
1467 retval = -daemonized;
1474 /* TODO error message */
1480 prepare_kernel_data:
1483 if (status.nfsv2.fhs_status != 0) {
1484 bb_error_msg("%s:%s failed, reason given by server: %s",
1486 nfs_strerror(status.nfsv2.fhs_status));
1489 memcpy(data.root.data,
1490 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1492 data.root.size = NFS_FHSIZE;
1493 memcpy(data.old_root.data,
1494 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1497 fhandle3 *my_fhandle;
1498 if (status.nfsv3.fhs_status != 0) {
1499 bb_error_msg("%s:%s failed, reason given by server: %s",
1501 nfs_strerror(status.nfsv3.fhs_status));
1504 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1505 memset(data.old_root.data, 0, NFS_FHSIZE);
1506 memset(&data.root, 0, sizeof(data.root));
1507 data.root.size = my_fhandle->fhandle3_len;
1508 memcpy(data.root.data,
1509 (char *) my_fhandle->fhandle3_val,
1510 my_fhandle->fhandle3_len);
1512 data.flags |= NFS_MOUNT_VER3;
1515 /* Create nfs socket for kernel */
1517 if (nfs_mount_version < 3) {
1518 bb_error_msg("NFS over TCP is not supported");
1521 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1523 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1525 bb_perror_msg("nfs socket");
1528 if (bindresvport(fsock, 0) < 0) {
1529 bb_perror_msg("nfs bindresvport");
1533 server_addr.sin_port = PMAPPORT;
1534 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1535 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1539 server_addr.sin_port = htons(port);
1541 /* Prepare data structure for kernel */
1543 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1544 strncpy(data.hostname, hostname, sizeof(data.hostname));
1547 auth_destroy(mclient->cl_auth);
1548 clnt_destroy(mclient);
1553 /* We must wait until mount directory is available */
1554 struct stat statbuf;
1556 while (stat(mp->mnt_dir, &statbuf) == -1) {
1558 daemonized = daemonize();
1559 if (daemonized <= 0) { /* parent or error */
1560 /* FIXME: parent doesn't close fsock - ??! */
1561 retval = -daemonized;
1565 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1572 /* Perform actual mount */
1574 mp->mnt_type = (char*)"nfs";
1575 retval = mount_it_now(mp, vfsflags, (char*)&data);
1582 auth_destroy(mclient->cl_auth);
1583 clnt_destroy(mclient);
1597 #else // !ENABLE_FEATURE_MOUNT_NFS
1599 // Never called. Call should be optimized out.
1600 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1602 #endif // !ENABLE_FEATURE_MOUNT_NFS
1604 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1605 // type detection. Returns 0 for success, nonzero for failure.
1606 // NB: mp->xxx fields may be trashed on exit
1607 static int singlemount(struct mntent *mp, int ignore_busy)
1611 char *loopFile = NULL, *filteropts = NULL;
1615 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1617 // Treat fstype "auto" as unspecified
1618 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1619 mp->mnt_type = NULL;
1621 // Might this be a virtual filesystem?
1622 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1626 // fsname: "cmd#arg1#arg2..."
1627 // WARNING: allows execution of arbitrary commands!
1628 // Try "mount 'sh#-c#sh' bogus_dir".
1629 // It is safe ONLY because non-root
1630 // cannot use two-argument mount command
1631 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1632 // "mount: can't find sh#-c#sh in /etc/fstab"
1633 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1638 while (*s && n < 35 - 2) {
1639 if (*s++ == '#' && *s != '#') {
1644 args[n++] = mp->mnt_dir;
1646 rc = wait4pid(xspawn(args));
1650 // Might this be an CIFS filesystem?
1651 if (ENABLE_FEATURE_MOUNT_CIFS
1652 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1653 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1654 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1656 #if 0 /* reported to break things */
1657 len_and_sockaddr *lsa;
1661 // Replace '/' with '\' and verify that unc points to "//server/share".
1662 for (s = mp->mnt_fsname; *s; ++s)
1663 if (*s == '/') *s = '\\';
1666 s = strrchr(mp->mnt_fsname, '\\');
1667 if (s <= mp->mnt_fsname+1)
1670 lsa = host2sockaddr(mp->mnt_fsname+2, 0);
1675 // Insert ip=... option into string flags.
1676 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1677 ip = xasprintf("ip=%s", dotted);
1678 parse_mount_options(ip, &filteropts);
1680 // Compose new unc '\\server-ip\share'
1681 // (s => slash after hostname)
1682 mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
1684 // Lock is required [why?]
1685 vfsflags |= MS_MANDLOCK;
1686 mp->mnt_type = (char*)"cifs";
1687 rc = mount_it_now(mp, vfsflags, filteropts);
1689 if (ENABLE_FEATURE_CLEAN_UP) {
1690 free(mp->mnt_fsname);
1699 // Might this be an NFS filesystem?
1700 if (ENABLE_FEATURE_MOUNT_NFS
1701 && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs"))
1702 && strchr(mp->mnt_fsname, ':') != NULL
1704 rc = nfsmount(mp, vfsflags, filteropts);
1708 // Look at the file. (Not found isn't a failure for remount, or for
1709 // a synthetic filesystem like proc or sysfs.)
1710 // (We use stat, not lstat, in order to allow
1711 // mount symlink_to_file_or_blkdev dir)
1712 if (!stat(mp->mnt_fsname, &st)
1713 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1715 // Do we need to allocate a loopback device for it?
1716 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1717 loopFile = bb_simplify_path(mp->mnt_fsname);
1718 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1719 if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) {
1720 if (errno == EPERM || errno == EACCES)
1721 bb_error_msg(bb_msg_perm_denied_are_you_root);
1723 bb_perror_msg("cannot setup loop device");
1727 // Autodetect bind mounts
1728 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1729 vfsflags |= MS_BIND;
1732 // If we know the fstype (or don't need to), jump straight
1733 // to the actual mount.
1734 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
1735 rc = mount_it_now(mp, vfsflags, filteropts);
1737 // Loop through filesystem types until mount succeeds
1740 // Initialize list of block backed filesystems. This has to be
1741 // done here so that during "mount -a", mounts after /proc shows up
1744 fslist = get_block_backed_filesystems();
1745 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1746 atexit(delete_block_backed_filesystems);
1749 for (fl = fslist; fl; fl = fl->link) {
1750 mp->mnt_type = fl->data;
1751 rc = mount_it_now(mp, vfsflags, filteropts);
1757 // If mount failed, clean up loop file (if any).
1758 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1759 del_loop(mp->mnt_fsname);
1760 if (ENABLE_FEATURE_CLEAN_UP) {
1762 free(mp->mnt_fsname);
1767 if (ENABLE_FEATURE_CLEAN_UP)
1770 if (errno == EBUSY && ignore_busy)
1773 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1778 * Unlike -t, -O should interpret "no" prefix differently:
1779 * -t noa,b,c = -t no(a,b,c) = mount all except fs'es with types a,b, and c
1780 * -O noa,b,c = -O noa,b,c = mount all with without option a,
1781 * or with option b or c.
1782 * But for now we do not support -O a,b,c at all (only -O a).
1784 * Another difference from -t support (match_fstype) is that
1785 * we need to examine the _list_ of options in fsopt, not just a string.
1787 static int match_opt(const char *fs_opt, const char *O_opt)
1795 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1800 len = strlen(O_opt);
1802 if (strncmp(fs_opt, O_opt, len) == 0
1803 && (fs_opt[len] == '\0' || fs_opt[len] == ',')
1807 fs_opt = strchr(fs_opt, ',');
1816 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1817 // each directory to be mounted.
1818 static const char must_be_root[] ALIGN1 = "you must be root";
1820 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1821 int mount_main(int argc UNUSED_PARAM, char **argv)
1823 char *cmdopts = xzalloc(1);
1824 char *fstype = NULL;
1825 char *O_optmatch = NULL;
1827 llist_t *lst_o = NULL;
1828 const char *fstabname;
1832 struct mntent mtpair[2], *mtcur = mtpair;
1833 IF_NOT_DESKTOP(const int nonroot = 0;)
1835 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1837 // Parse long options, like --bind and --move. Note that -o option
1838 // and --option are synonymous. Yes, this means --remount,rw works.
1839 for (i = j = 1; argv[i]; i++) {
1840 if (argv[i][0] == '-' && argv[i][1] == '-')
1841 append_mount_options(&cmdopts, argv[i] + 2);
1843 argv[j++] = argv[i];
1847 // Parse remaining options
1848 // Max 2 params; -o is a list, -v is a counter
1849 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1850 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1851 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1852 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1853 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1854 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1857 // If we have no arguments, show currently mounted filesystems
1859 if (!(opt & OPT_a)) {
1860 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1863 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1865 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1868 // Don't show rootfs. FIXME: why??
1869 // util-linux 2.12a happily shows rootfs...
1870 //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue;
1872 if (!fstype || !strcmp(mtpair->mnt_type, fstype))
1873 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1874 mtpair->mnt_dir, mtpair->mnt_type,
1877 if (ENABLE_FEATURE_CLEAN_UP)
1878 endmntent(mountTable);
1879 return EXIT_SUCCESS;
1881 storage_path = NULL;
1883 // When we have two arguments, the second is the directory and we can
1884 // skip looking at fstab entirely. We can always abspath() the directory
1885 // argument when we get it.
1888 bb_error_msg_and_die(must_be_root);
1889 mtpair->mnt_fsname = argv[0];
1890 mtpair->mnt_dir = argv[1];
1891 mtpair->mnt_type = fstype;
1892 mtpair->mnt_opts = cmdopts;
1893 resolve_mount_spec(&mtpair->mnt_fsname);
1894 rc = singlemount(mtpair, 0);
1897 storage_path = bb_simplify_path(argv[0]); // malloced
1900 // Past this point, we are handling either "mount -a [opts]"
1901 // or "mount [opts] single_param"
1903 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
1904 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
1905 bb_error_msg_and_die(must_be_root);
1907 // If we have a shared subtree flag, don't worry about fstab or mtab.
1908 if (ENABLE_FEATURE_MOUNT_FLAGS
1909 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
1911 // verbose_mount(source, target, type, flags, data)
1912 rc = verbose_mount("", argv[0], "", i, "");
1914 bb_simple_perror_msg_and_die(argv[0]);
1918 // Open either fstab or mtab
1919 fstabname = "/etc/fstab";
1920 if (i & MS_REMOUNT) {
1921 // WARNING. I am not sure this matches util-linux's
1922 // behavior. It's possible util-linux does not
1923 // take -o opts from mtab (takes only mount source).
1924 fstabname = bb_path_mtab_file;
1926 fstab = setmntent(fstabname, "r");
1928 bb_perror_msg_and_die("cannot read %s", fstabname);
1930 // Loop through entries until we find what we're looking for
1931 memset(mtpair, 0, sizeof(mtpair));
1933 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
1935 // Get next fstab entry
1936 if (!getmntent_r(fstab, mtcur, getmntent_buf
1937 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
1938 GETMNTENT_BUFSIZE/2)
1939 ) { // End of fstab/mtab is reached
1940 mtcur = mtother; // the thing we found last time
1944 // If we're trying to mount something specific and this isn't it,
1945 // skip it. Note we must match the exact text in fstab (ala
1946 // "proc") or a full path from root
1949 // Is this what we're looking for?
1950 if (strcmp(argv[0], mtcur->mnt_fsname) &&
1951 strcmp(storage_path, mtcur->mnt_fsname) &&
1952 strcmp(argv[0], mtcur->mnt_dir) &&
1953 strcmp(storage_path, mtcur->mnt_dir)) continue;
1955 // Remember this entry. Something later may have
1956 // overmounted it, and we want the _last_ match.
1959 // 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(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);
1989 if (singlemount(mtcur, 1)) {
1990 // Count number of failed mounts
1993 free(mtcur->mnt_opts);
1997 // End of fstab/mtab is reached.
1998 // Were we looking for something specific?
2002 // If we didn't find anything, complain
2003 if (!mtcur->mnt_fsname)
2004 bb_error_msg_and_die("can't find %s in %s",
2005 argv[0], fstabname);
2007 // What happens when we try to "mount swap_partition"?
2008 // (fstab containts "swap_partition swap swap defaults 0 0")
2009 // util-linux-ng 2.13.1 does this:
2010 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2011 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2012 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2013 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2014 // exit_group(32) = ?
2016 // In case we want to simply skip swap partitions:
2017 l = parse_mount_options(mtcur->mnt_opts, NULL);
2018 if ((l & MOUNT_SWAP)
2019 // swap is bogus "fstype", parse_mount_options can't check fstypes
2020 || strcasecmp(mtcur->mnt_type, "swap") == 0
2026 // fstab must have "users" or "user"
2027 l = parse_mount_options(mtcur->mnt_opts, NULL);
2028 if (!(l & MOUNT_USERS))
2029 bb_error_msg_and_die(must_be_root);
2032 // Mount the last thing we found
2033 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2034 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2035 resolve_mount_spec(&mtpair->mnt_fsname);
2036 rc = singlemount(mtcur, 0);
2037 if (ENABLE_FEATURE_CLEAN_UP)
2038 free(mtcur->mnt_opts);
2042 if (ENABLE_FEATURE_CLEAN_UP)
2044 if (ENABLE_FEATURE_CLEAN_UP) {