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 source tree.
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.
20 //usage:#define mount_trivial_usage
21 //usage: "[OPTIONS] [-o OPTS] DEVICE NODE"
22 //usage:#define mount_full_usage "\n\n"
23 //usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n"
24 //usage: "\n -a Mount all filesystems in fstab"
25 //usage: IF_FEATURE_MOUNT_FAKE(
26 //usage: IF_FEATURE_MTAB_SUPPORT(
27 //usage: "\n -f Update /etc/mtab, but don't mount"
29 //usage: IF_NOT_FEATURE_MTAB_SUPPORT(
30 //usage: "\n -f Dry run"
33 //usage: IF_FEATURE_MOUNT_HELPERS(
34 //usage: "\n -i Don't run mount helper"
36 //usage: IF_FEATURE_MTAB_SUPPORT(
37 //usage: "\n -n Don't update /etc/mtab"
39 //usage: "\n -r Read-only mount"
40 //usage: "\n -w Read-write mount (default)"
41 //usage: "\n -t FSTYPE[,...] Filesystem type(s)"
42 //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
44 //usage: IF_FEATURE_MOUNT_LOOP(
45 //usage: "\n loop Ignored (loop devices are autodetected)"
47 //usage: IF_FEATURE_MOUNT_FLAGS(
48 //usage: "\n [a]sync Writes are [a]synchronous"
49 //usage: "\n [no]atime Disable/enable updates to inode access times"
50 //usage: "\n [no]diratime Disable/enable atime updates to directories"
51 //usage: "\n [no]relatime Disable/enable atime updates relative to modification time"
52 //usage: "\n [no]dev (Dis)allow use of special device files"
53 //usage: "\n [no]exec (Dis)allow use of executable files"
54 //usage: "\n [no]suid (Dis)allow set-user-id-root programs"
55 //usage: "\n [r]shared Convert [recursively] to a shared subtree"
56 //usage: "\n [r]slave Convert [recursively] to a slave subtree"
57 //usage: "\n [r]private Convert [recursively] to a private subtree"
58 //usage: "\n [un]bindable Make mount point [un]able to be bind mounted"
59 //usage: "\n [r]bind Bind a file or directory [recursively] to another location"
60 //usage: "\n move Relocate an existing mount point"
62 //usage: "\n remount Remount a mounted filesystem, changing flags"
63 //usage: "\n ro/rw Same as -r/-w"
65 //usage: "\nThere are filesystem-specific -o flags."
67 //usage:#define mount_example_usage
69 //usage: "/dev/hda3 on / type minix (rw)\n"
70 //usage: "proc on /proc type proc (rw)\n"
71 //usage: "devpts on /dev/pts type devpts (rw)\n"
72 //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n"
73 //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
74 //usage: "$ mount cd_image.iso mydir\n"
75 //usage:#define mount_notes_usage
76 //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount."
80 #include <sys/mount.h>
81 // Grab more as needed from util-linux's mount/mount_constants.h
83 # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
86 # define MS_UNION (1 << 8)
89 # define MS_BIND (1 << 12)
92 # define MS_MOVE (1 << 13)
95 # define MS_RECURSIVE (1 << 14)
98 # define MS_SILENT (1 << 15)
100 // The shared subtree stuff, which went in around 2.6.15
101 #ifndef MS_UNBINDABLE
102 # define MS_UNBINDABLE (1 << 17)
105 # define MS_PRIVATE (1 << 18)
108 # define MS_SLAVE (1 << 19)
111 # define MS_SHARED (1 << 20)
114 # define MS_RELATIME (1 << 21)
116 #ifndef MS_STRICTATIME
117 # define MS_STRICTATIME (1 << 24)
120 /* Any ~MS_FOO value has this bit set: */
121 #define BB_MS_INVERTED_VALUE (1u << 31)
124 #if ENABLE_FEATURE_MOUNT_LABEL
125 # include "volume_id.h"
127 # define resolve_mount_spec(fsname) ((void)0)
130 // Needed for nfs support only
131 #include <sys/utsname.h>
134 #if ENABLE_FEATURE_MOUNT_NFS
135 /* This is just a warning of a common mistake. Possibly this should be a
136 * uclibc faq entry rather than in busybox... */
137 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
138 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
140 # include <rpc/rpc.h>
141 # include <rpc/pmap_prot.h>
142 # include <rpc/pmap_clnt.h>
146 #if defined(__dietlibc__)
147 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
148 // dietlibc-0.30 does not have implementation of getmntent_r()
149 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
150 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
152 struct mntent* ment = getmntent(stream);
153 return memcpy(result, ment, sizeof(*ment));
158 // Not real flags, but we want to be able to check for this.
160 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
161 MOUNT_NOAUTO = (1 << 29),
162 MOUNT_SWAP = (1 << 30),
166 #define OPTION_STR "o:t:rwanfvsiO:"
181 #if ENABLE_FEATURE_MTAB_SUPPORT
182 #define USE_MTAB (!(option_mask32 & OPT_n))
187 #if ENABLE_FEATURE_MOUNT_FAKE
188 #define FAKE_IT (option_mask32 & OPT_f)
193 #if ENABLE_FEATURE_MOUNT_HELPERS
194 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
196 #define HELPERS_ALLOWED 0
200 // TODO: more "user" flag compatibility.
201 // "user" option (from mount manpage):
202 // Only the user that mounted a filesystem can unmount it again.
203 // If any user should be able to unmount, then use users instead of user
204 // in the fstab line. The owner option is similar to the user option,
205 // with the restriction that the user must be the owner of the special file.
206 // This may be useful e.g. for /dev/fd if a login script makes
207 // the console user owner of this device.
209 // Standard mount options (from -o options or --options),
210 // with corresponding flags
211 static const int32_t mount_options[] = {
212 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
214 IF_FEATURE_MOUNT_LOOP(
218 IF_FEATURE_MOUNT_FSTAB(
220 /* "quiet" 0 - do not filter out, vfat wants to see it */
221 /* "noauto" */ MOUNT_NOAUTO,
222 /* "sw" */ MOUNT_SWAP,
223 /* "swap" */ MOUNT_SWAP,
224 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
225 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
227 IF_DESKTOP(/* "comment" */ 0,) /* systemd uses this in fstab */
230 IF_FEATURE_MOUNT_FLAGS(
232 /* "nosuid" */ MS_NOSUID,
233 /* "suid" */ ~MS_NOSUID,
234 /* "dev" */ ~MS_NODEV,
235 /* "nodev" */ MS_NODEV,
236 /* "exec" */ ~MS_NOEXEC,
237 /* "noexec" */ MS_NOEXEC,
238 /* "sync" */ MS_SYNCHRONOUS,
239 /* "dirsync" */ MS_DIRSYNC,
240 /* "async" */ ~MS_SYNCHRONOUS,
241 /* "atime" */ ~MS_NOATIME,
242 /* "noatime" */ MS_NOATIME,
243 /* "diratime" */ ~MS_NODIRATIME,
244 /* "nodiratime" */ MS_NODIRATIME,
245 /* "mand" */ MS_MANDLOCK,
246 /* "nomand" */ ~MS_MANDLOCK,
247 /* "relatime" */ MS_RELATIME,
248 /* "norelatime" */ ~MS_RELATIME,
249 /* "strictatime" */ MS_STRICTATIME,
250 /* "loud" */ ~MS_SILENT,
251 /* "rbind" */ MS_BIND|MS_RECURSIVE,
254 /* "union" */ MS_UNION,
255 /* "bind" */ MS_BIND,
256 /* "move" */ MS_MOVE,
257 /* "shared" */ MS_SHARED,
258 /* "slave" */ MS_SLAVE,
259 /* "private" */ MS_PRIVATE,
260 /* "unbindable" */ MS_UNBINDABLE,
261 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
262 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
263 /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
264 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
267 // Always understood.
268 /* "ro" */ MS_RDONLY, // vfs flag
269 /* "rw" */ ~MS_RDONLY, // vfs flag
270 /* "remount" */ MS_REMOUNT // action flag
273 static const char mount_option_str[] =
274 IF_FEATURE_MOUNT_LOOP(
277 IF_FEATURE_MOUNT_FSTAB(
279 // "quiet\0" - do not filter out, vfat wants to see it
284 IF_DESKTOP("users\0")
286 IF_DESKTOP("comment\0") /* systemd uses this in fstab */
288 IF_FEATURE_MOUNT_FLAGS(
325 // Always understood.
328 "remount\0" // action flag
333 #if ENABLE_FEATURE_MOUNT_NFS
334 smalluint nfs_mount_version;
336 #if ENABLE_FEATURE_MOUNT_VERBOSE
340 char getmntent_buf[1];
342 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
343 #define G (*(struct globals*)&bb_common_bufsiz1)
344 #define nfs_mount_version (G.nfs_mount_version)
345 #if ENABLE_FEATURE_MOUNT_VERBOSE
346 #define verbose (G.verbose )
350 #define fslist (G.fslist )
351 #define getmntent_buf (G.getmntent_buf )
352 #define INIT_G() do { } while (0)
354 #if ENABLE_FEATURE_MTAB_SUPPORT
356 * update_mtab_entry_on_move() is used to update entry in case of mount --move.
357 * we are looking for existing entries mnt_dir which is equal to mnt_fsname of
358 * input mntent and replace it by new one.
360 static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
362 struct mntent *entries, *m;
366 mountTable = setmntent(bb_path_mtab_file, "r");
368 bb_perror_msg(bb_path_mtab_file);
374 while ((m = getmntent(mountTable)) != NULL) {
375 entries = xrealloc_vector(entries, 3, count);
376 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
377 entries[count].mnt_dir = xstrdup(m->mnt_dir);
378 entries[count].mnt_type = xstrdup(m->mnt_type);
379 entries[count].mnt_opts = xstrdup(m->mnt_opts);
380 entries[count].mnt_freq = m->mnt_freq;
381 entries[count].mnt_passno = m->mnt_passno;
384 endmntent(mountTable);
386 mountTable = setmntent(bb_path_mtab_file, "w");
388 for (i = 0; i < count; i++) {
389 if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
390 addmntent(mountTable, &entries[i]);
392 addmntent(mountTable, mp);
394 endmntent(mountTable);
395 } else if (errno != EROFS)
396 bb_perror_msg(bb_path_mtab_file);
398 if (ENABLE_FEATURE_CLEAN_UP) {
399 for (i = 0; i < count; i++) {
400 free(entries[i].mnt_fsname);
401 free(entries[i].mnt_dir);
402 free(entries[i].mnt_type);
403 free(entries[i].mnt_opts);
410 #if ENABLE_FEATURE_MOUNT_VERBOSE
411 static int verbose_mount(const char *source, const char *target,
412 const char *filesystemtype,
413 unsigned long mountflags, const void *data)
418 rc = mount(source, target, filesystemtype, mountflags, data);
420 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
421 source, target, filesystemtype,
422 mountflags, (char*)data, rc);
426 #define verbose_mount(...) mount(__VA_ARGS__)
429 // Append mount options to string
430 static void append_mount_options(char **oldopts, const char *newopts)
432 if (*oldopts && **oldopts) {
433 // Do not insert options which are already there
436 int len = strlen(newopts);
437 p = strchr(newopts, ',');
438 if (p) len = p - newopts;
441 if (!strncmp(p, newopts, len)
442 && (p[len] == ',' || p[len] == '\0'))
448 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
453 while (newopts[0] == ',') newopts++;
456 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
457 *oldopts = xstrdup(newopts);
461 // Use the mount_options list to parse options into flags.
462 // Also update list of unrecognized options if unrecognized != NULL
463 static unsigned long parse_mount_options(char *options, char **unrecognized)
465 unsigned long flags = MS_SILENT;
467 // Loop through options
470 char *comma = strchr(options, ',');
471 const char *option_str = mount_option_str;
473 if (comma) *comma = '\0';
475 // FIXME: use hasmntopt()
476 // Find this option in mount_options
477 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
478 /* We support "option=" match for "comment=" thingy */
479 unsigned opt_len = strlen(option_str);
480 if (strncasecmp(option_str, options, opt_len) == 0
481 && (options[opt_len] == '\0' || options[opt_len] == '=')
483 unsigned long fl = mount_options[i];
484 if (fl & BB_MS_INVERTED_VALUE)
490 option_str += opt_len + 1;
492 // We did not recognize this option.
493 // If "unrecognized" is not NULL, append option there.
494 // Note that we should not append *empty* option -
495 // in this case we want to pass NULL, not "", to "data"
496 // parameter of mount(2) syscall.
497 // This is crucial for filesystems that don't accept
498 // any arbitrary mount options, like cgroup fs:
499 // "mount -t cgroup none /mnt"
500 if (options[0] && unrecognized) {
501 // Add it to strflags, to pass on to kernel
502 char *p = *unrecognized;
503 unsigned len = p ? strlen(p) : 0;
504 *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
506 // Comma separated if it's not the first one
507 if (len) p[len++] = ',';
508 strcpy(p + len, options);
513 // Advance to next option
521 // Return a list of all block device backed filesystems
522 static llist_t *get_block_backed_filesystems(void)
524 static const char filesystems[2][sizeof("/proc/filesystems")] = {
529 llist_t *list = NULL;
533 for (i = 0; i < 2; i++) {
534 f = fopen_for_read(filesystems[i]);
537 while ((buf = xmalloc_fgetline(f)) != NULL) {
538 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
540 fs = skip_whitespace(buf);
541 if (*fs == '#' || *fs == '*' || !*fs)
544 llist_add_to_end(&list, xstrdup(fs));
548 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
554 #if ENABLE_FEATURE_CLEAN_UP
555 static void delete_block_backed_filesystems(void)
557 llist_free(fslist, free);
560 void delete_block_backed_filesystems(void);
563 // Perform actual mount of specific filesystem at specific location.
564 // NB: mp->xxx fields may be trashed on exit
565 static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts)
571 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
572 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
573 vfsflags, filteropts);
577 // Mount, with fallback to read-only if necessary.
580 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
581 vfsflags, filteropts);
583 // If mount failed, try
584 // helper program mount.<mnt_type>
585 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
587 int errno_save = errno;
588 args[0] = xasprintf("mount.%s", mp->mnt_type);
591 args[rc++] = (char *)"-f";
592 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
593 args[rc++] = (char *)"-n";
594 args[rc++] = mp->mnt_fsname;
595 args[rc++] = mp->mnt_dir;
597 args[rc++] = (char *)"-o";
598 args[rc++] = filteropts;
601 rc = spawn_and_wait(args);
608 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
610 if (!(vfsflags & MS_SILENT))
611 bb_error_msg("%s is write-protected, mounting read-only",
613 vfsflags |= MS_RDONLY;
616 // Abort entirely if permission denied.
618 if (rc && errno == EPERM)
619 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
621 // If the mount was successful, and we're maintaining an old-style
622 // mtab file by hand, add the new entry to it now.
624 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
626 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
627 const char *option_str = mount_option_str;
631 bb_perror_msg(bb_path_mtab_file);
635 // Add vfs string flags
636 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
637 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
638 append_mount_options(&(mp->mnt_opts), option_str);
639 option_str += strlen(option_str) + 1;
642 // Remove trailing / (if any) from directory we mounted on
643 i = strlen(mp->mnt_dir) - 1;
644 while (i > 0 && mp->mnt_dir[i] == '/')
645 mp->mnt_dir[i--] = '\0';
647 // Convert to canonical pathnames as needed
648 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
650 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
651 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
652 mp->mnt_type = (char*)"bind";
654 mp->mnt_freq = mp->mnt_passno = 0;
657 #if ENABLE_FEATURE_MTAB_SUPPORT
658 if (vfsflags & MS_MOVE)
659 update_mtab_entry_on_move(mp);
662 addmntent(mountTable, mp);
663 endmntent(mountTable);
665 if (ENABLE_FEATURE_CLEAN_UP) {
674 #if ENABLE_FEATURE_MOUNT_NFS
678 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
680 * Licensed under GPLv2, see file LICENSE in this source tree.
682 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
683 * numbers to be specified on the command line.
685 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
686 * Omit the call to connect() for Linux version 1.3.11 or later.
688 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
689 * Implemented the "bg", "fg" and "retry" mount options for NFS.
691 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
692 * - added Native Language Support
694 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
698 #define MOUNTPORT 635
699 #define MNTPATHLEN 1024
700 #define MNTNAMLEN 255
704 typedef char fhandle[FHSIZE];
707 unsigned int fhandle3_len;
719 MNT3ERR_NAMETOOLONG = 63,
720 MNT3ERR_NOTSUPP = 10004,
721 MNT3ERR_SERVERFAULT = 10006,
723 typedef enum mountstat3 mountstat3;
726 unsigned int fhs_status;
731 typedef struct fhstatus fhstatus;
733 struct mountres3_ok {
736 unsigned int auth_flavours_len;
737 char *auth_flavours_val;
740 typedef struct mountres3_ok mountres3_ok;
743 mountstat3 fhs_status;
745 mountres3_ok mountinfo;
748 typedef struct mountres3 mountres3;
750 typedef char *dirpath;
754 typedef struct mountbody *mountlist;
758 dirpath ml_directory;
761 typedef struct mountbody mountbody;
763 typedef struct groupnode *groups;
769 typedef struct groupnode groupnode;
771 typedef struct exportnode *exports;
778 typedef struct exportnode exportnode;
791 typedef struct ppathcnf ppathcnf;
793 #define MOUNTPROG 100005
796 #define MOUNTPROC_NULL 0
797 #define MOUNTPROC_MNT 1
798 #define MOUNTPROC_DUMP 2
799 #define MOUNTPROC_UMNT 3
800 #define MOUNTPROC_UMNTALL 4
801 #define MOUNTPROC_EXPORT 5
802 #define MOUNTPROC_EXPORTALL 6
804 #define MOUNTVERS_POSIX 2
806 #define MOUNTPROC_PATHCONF 7
810 #define MOUNTPROC3_NULL 0
811 #define MOUNTPROC3_MNT 1
812 #define MOUNTPROC3_DUMP 2
813 #define MOUNTPROC3_UMNT 3
814 #define MOUNTPROC3_UMNTALL 4
815 #define MOUNTPROC3_EXPORT 5
827 * We want to be able to compile mount on old kernels in such a way
828 * that the binary will work well on more recent kernels.
829 * Thus, if necessary we teach nfsmount.c the structure of new fields
830 * that will come later.
832 * Moreover, the new kernel includes conflict with glibc includes
833 * so it is easiest to ignore the kernel altogether (at compile time).
841 unsigned char data[64];
844 struct nfs_mount_data {
847 struct nfs2_fh old_root; /* 1 */
853 int acregmin; /* 1 */
854 int acregmax; /* 1 */
855 int acdirmin; /* 1 */
856 int acdirmax; /* 1 */
857 struct sockaddr_in addr; /* 1 */
858 char hostname[256]; /* 1 */
860 unsigned int bsize; /* 3 */
861 struct nfs3_fh root; /* 4 */
864 /* bits in the flags field */
866 NFS_MOUNT_SOFT = 0x0001, /* 1 */
867 NFS_MOUNT_INTR = 0x0002, /* 1 */
868 NFS_MOUNT_SECURE = 0x0004, /* 1 */
869 NFS_MOUNT_POSIX = 0x0008, /* 1 */
870 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
871 NFS_MOUNT_NOAC = 0x0020, /* 1 */
872 NFS_MOUNT_TCP = 0x0040, /* 2 */
873 NFS_MOUNT_VER3 = 0x0080, /* 3 */
874 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
875 NFS_MOUNT_NONLM = 0x0200, /* 3 */
876 NFS_MOUNT_NOACL = 0x0800, /* 4 */
877 NFS_MOUNT_NORDIRPLUS = 0x4000
882 * We need to translate between nfs status return values and
883 * the local errno values which may not be the same.
885 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
886 * "after #include <errno.h> the symbol errno is reserved for any use,
887 * it cannot even be used as a struct tag or field name".
890 # define EDQUOT ENOSPC
892 /* Convert each NFSERR_BLAH into EBLAH */
893 static const uint8_t nfs_err_stat[] = {
895 19, 20, 21, 22, 27, 28,
896 30, 63, 66, 69, 70, 71
899 EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
900 ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
901 EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
902 typedef uint8_t nfs_err_type;
904 typedef uint16_t nfs_err_type;
906 static const nfs_err_type nfs_err_errnum[] = {
907 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
908 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
909 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
911 static char *nfs_strerror(int status)
915 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
916 if (nfs_err_stat[i] == status)
917 return strerror(nfs_err_errnum[i]);
919 return xasprintf("unknown nfs status return value: %d", status);
922 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
924 return xdr_opaque(xdrs, objp, FHSIZE);
927 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
929 if (!xdr_u_int(xdrs, &objp->fhs_status))
931 if (objp->fhs_status == 0)
932 return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
936 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
938 return xdr_string(xdrs, objp, MNTPATHLEN);
941 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
943 return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
944 (unsigned int *) &objp->fhandle3_len,
948 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
950 if (!xdr_fhandle3(xdrs, &objp->fhandle))
952 return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
953 &(objp->auth_flavours.auth_flavours_len),
956 (xdrproc_t) xdr_int);
959 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
961 return xdr_enum(xdrs, (enum_t *) objp);
964 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
966 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
968 if (objp->fhs_status == MNT_OK)
969 return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
973 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
976 * Unfortunately, the kernel prints annoying console messages
977 * in case of an unexpected nfs mount version (instead of
978 * just returning some error). Therefore we'll have to try
979 * and figure out what version the kernel expects.
982 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
983 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
984 * nfs_mount_version: version this source and running kernel can handle
987 find_kernel_nfs_mount_version(void)
991 if (nfs_mount_version)
994 nfs_mount_version = 4; /* default */
996 kernel_version = get_linux_version_code();
997 if (kernel_version) {
998 if (kernel_version < KERNEL_VERSION(2,2,18))
999 nfs_mount_version = 3;
1000 /* else v4 since 2.3.99pre4 */
1005 get_mountport(struct pmap *pm_mnt,
1006 struct sockaddr_in *server_addr,
1008 long unsigned version,
1009 long unsigned proto,
1012 struct pmaplist *pmap;
1014 server_addr->sin_port = PMAPPORT;
1015 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
1016 * I understand it like "IPv6 for this is not 100% ready" */
1017 pmap = pmap_getmaps(server_addr);
1019 if (version > MAX_NFSPROT)
1020 version = MAX_NFSPROT;
1023 pm_mnt->pm_prog = prog;
1024 pm_mnt->pm_vers = version;
1025 pm_mnt->pm_prot = proto;
1026 pm_mnt->pm_port = port;
1029 if (pmap->pml_map.pm_prog != prog)
1031 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
1033 if (version > 2 && pmap->pml_map.pm_vers != version)
1035 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
1037 if (pmap->pml_map.pm_vers > MAX_NFSPROT
1038 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
1039 || (port && pmap->pml_map.pm_port != port)
1043 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
1045 pmap = pmap->pml_next;
1047 if (!pm_mnt->pm_vers)
1048 pm_mnt->pm_vers = MOUNTVERS;
1049 if (!pm_mnt->pm_port)
1050 pm_mnt->pm_port = MOUNTPORT;
1051 if (!pm_mnt->pm_prot)
1052 pm_mnt->pm_prot = IPPROTO_TCP;
1056 static int daemonize(void)
1059 if (pid < 0) /* error */
1061 if (pid > 0) /* parent */
1065 xopen(bb_dev_null, O_RDWR);
1069 openlog(applet_name, LOG_PID, LOG_DAEMON);
1070 logmode = LOGMODE_SYSLOG;
1074 static inline int daemonize(void) { return -ENOSYS; }
1078 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
1083 /* RPC strerror analogs are terminally idiotic:
1084 * *mandatory* prefix and \n at end.
1085 * This hopefully helps. Usage:
1086 * error_msg_rpc(clnt_*error*(" ")) */
1087 static void error_msg_rpc(const char *msg)
1090 while (msg[0] == ' ' || msg[0] == ':') msg++;
1092 while (len && msg[len-1] == '\n') len--;
1093 bb_error_msg("%.*s", len, msg);
1096 /* NB: mp->xxx fields may be trashed on exit */
1097 static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1103 /* prior to 2.6.23, kernel took NFS options in a form of this struct
1104 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
1105 * then data pointer is interpreted as a string. */
1106 struct nfs_mount_data data;
1109 struct sockaddr_in server_addr;
1110 struct sockaddr_in mount_server_addr;
1113 struct fhstatus nfsv2;
1114 struct mountres3 nfsv3;
1132 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1143 find_kernel_nfs_mount_version();
1151 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1153 filteropts = xstrdup(filteropts); /* going to trash it later... */
1155 hostname = xstrdup(mp->mnt_fsname);
1156 /* mount_main() guarantees that ':' is there */
1157 s = strchr(hostname, ':');
1160 /* Ignore all but first hostname in replicated mounts
1161 * until they can be fully supported. (mack@sgi.com) */
1162 s = strchr(hostname, ',');
1165 bb_error_msg("warning: multiple hostnames not supported");
1168 server_addr.sin_family = AF_INET;
1169 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1170 hp = gethostbyname(hostname);
1172 bb_herror_msg("%s", hostname);
1175 if (hp->h_length != (int)sizeof(struct in_addr)) {
1176 bb_error_msg_and_die("only IPv4 is supported");
1178 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1181 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1183 /* add IP address to mtab options for use when unmounting */
1185 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1186 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1188 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1189 mp->mnt_opts[0] ? "," : "",
1190 inet_ntoa(server_addr.sin_addr));
1195 /* Set default options.
1196 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1197 * let the kernel decide.
1198 * timeo is filled in after we know whether it'll be TCP or UDP. */
1199 memset(&data, 0, sizeof(data));
1205 data.namlen = NAME_MAX;
1215 retry = 10000; /* 10000 minutes ~ 1 week */
1216 tcp = 1; /* nfs-utils uses tcp per default */
1218 mountprog = MOUNTPROG;
1226 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1227 char *opteq = strchr(opt, '=');
1230 static const char options[] ALIGN1 =
1235 /* 4 */ "acregmin\0"
1236 /* 5 */ "acregmax\0"
1237 /* 6 */ "acdirmin\0"
1238 /* 7 */ "acdirmax\0"
1242 /* 11 */ "mountport\0"
1243 /* 12 */ "mounthost\0"
1244 /* 13 */ "mountprog\0"
1245 /* 14 */ "mountvers\0"
1246 /* 15 */ "nfsprog\0"
1247 /* 16 */ "nfsvers\0"
1254 idx = index_in_strings(options, opt);
1256 case 12: // "mounthost"
1257 mounthost = xstrndup(opteq,
1258 strcspn(opteq, " \t\n\r,"));
1261 if (!strncmp(opteq, "tcp", 3))
1263 else if (!strncmp(opteq, "udp", 3))
1266 bb_error_msg("warning: unrecognized proto= option");
1268 case 20: // "addr" - ignore
1271 if (vfsflags & MS_REMOUNT)
1275 val = xatoi_positive(opteq);
1286 case 3: // "retrans"
1289 case 4: // "acregmin"
1290 data.acregmin = val;
1292 case 5: // "acregmax"
1293 data.acregmax = val;
1295 case 6: // "acdirmin"
1296 data.acdirmin = val;
1298 case 7: // "acdirmax"
1299 data.acdirmax = val;
1301 case 8: // "actimeo"
1302 data.acregmin = val;
1303 data.acregmax = val;
1304 data.acdirmin = val;
1305 data.acdirmax = val;
1313 case 11: // "mountport"
1316 case 13: // "mountprog"
1319 case 14: // "mountvers"
1322 case 15: // "nfsprog"
1325 case 16: // "nfsvers"
1329 case 19: // "namlen"
1330 //if (nfs_mount_version >= 2)
1333 // bb_error_msg("warning: option namlen is not supported\n");
1336 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1340 else { /* not of the form opt=val */
1341 static const char options[] ALIGN1 =
1356 if (!strncmp(opt, "no", 2)) {
1360 switch (index_in_strings(options, opt)) {
1396 if (nfs_mount_version >= 3)
1399 bb_error_msg("warning: option nolock is not supported");
1408 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1413 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1415 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1416 | (intr ? NFS_MOUNT_INTR : 0)
1417 | (posix ? NFS_MOUNT_POSIX : 0)
1418 | (nocto ? NFS_MOUNT_NOCTO : 0)
1419 | (noac ? NFS_MOUNT_NOAC : 0)
1420 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0)
1421 | (noacl ? NFS_MOUNT_NOACL : 0);
1422 if (nfs_mount_version >= 2)
1423 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1424 if (nfs_mount_version >= 3)
1425 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1426 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1427 bb_error_msg("NFSv%d not supported", nfsvers);
1430 if (nfsvers && !mountvers)
1431 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1432 if (nfsvers && nfsvers < mountvers) {
1433 mountvers = nfsvers;
1436 /* Adjust options if none specified */
1438 data.timeo = tcp ? 70 : 7;
1440 data.version = nfs_mount_version;
1442 if (vfsflags & MS_REMOUNT)
1446 * If the previous mount operation on the same host was
1447 * backgrounded, and the "bg" for this mount is also set,
1448 * give up immediately, to avoid the initial timeout.
1450 if (bg && we_saw_this_host_before(hostname)) {
1451 daemonized = daemonize();
1452 if (daemonized <= 0) { /* parent or error */
1453 retval = -daemonized;
1458 /* Create mount daemon client */
1459 /* See if the nfs host = mount host. */
1461 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1462 mount_server_addr.sin_family = AF_INET;
1463 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1465 hp = gethostbyname(mounthost);
1467 bb_herror_msg("%s", mounthost);
1470 if (hp->h_length != (int)sizeof(struct in_addr)) {
1471 bb_error_msg_and_die("only IPv4 is supported");
1473 mount_server_addr.sin_family = AF_INET;
1474 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1479 * The following loop implements the mount retries. When the mount
1480 * times out, and the "bg" option is set, we background ourself
1481 * and continue trying.
1483 * The case where the mount point is not present and the "bg"
1484 * option is set, is treated as a timeout. This is done to
1485 * support nested mounts.
1487 * The "retry" count specified by the user is the number of
1488 * minutes to retry before giving up.
1491 struct timeval total_timeout;
1492 struct timeval retry_timeout;
1498 retry_timeout.tv_sec = 3;
1499 retry_timeout.tv_usec = 0;
1500 total_timeout.tv_sec = 20;
1501 total_timeout.tv_usec = 0;
1502 /* FIXME: use monotonic()? */
1503 timeout = time(NULL) + 60 * retry;
1507 /* Be careful not to use too many CPU cycles */
1511 get_mountport(&pm_mnt, &mount_server_addr,
1516 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1518 /* contact the mount daemon via TCP */
1519 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1520 msock = RPC_ANYSOCK;
1522 switch (pm_mnt.pm_prot) {
1524 mclient = clntudp_create(&mount_server_addr,
1531 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1532 msock = RPC_ANYSOCK;
1534 mclient = clnttcp_create(&mount_server_addr,
1543 if (!daemonized && prevt == 0)
1544 error_msg_rpc(clnt_spcreateerror(" "));
1546 enum clnt_stat clnt_stat;
1548 /* Try to mount hostname:pathname */
1549 mclient->cl_auth = authunix_create_default();
1551 /* Make pointers in xdr_mountres3 NULL so
1552 * that xdr_array allocates memory for us
1554 memset(&status, 0, sizeof(status));
1556 if (pm_mnt.pm_vers == 3)
1557 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1558 (xdrproc_t) xdr_dirpath,
1559 (caddr_t) &pathname,
1560 (xdrproc_t) xdr_mountres3,
1564 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1565 (xdrproc_t) xdr_dirpath,
1566 (caddr_t) &pathname,
1567 (xdrproc_t) xdr_fhstatus,
1571 if (clnt_stat == RPC_SUCCESS)
1572 goto prepare_kernel_data; /* we're done */
1573 if (errno != ECONNREFUSED) {
1574 error_msg_rpc(clnt_sperror(mclient, " "));
1575 goto fail; /* don't retry */
1577 /* Connection refused */
1578 if (!daemonized && prevt == 0) /* print just once */
1579 error_msg_rpc(clnt_sperror(mclient, " "));
1580 auth_destroy(mclient->cl_auth);
1581 clnt_destroy(mclient);
1587 /* Timeout. We are going to retry... maybe */
1591 daemonized = daemonize();
1592 if (daemonized <= 0) { /* parent or error */
1593 retval = -daemonized;
1600 /* TODO error message */
1606 prepare_kernel_data:
1609 if (status.nfsv2.fhs_status != 0) {
1610 bb_error_msg("%s:%s failed, reason given by server: %s",
1612 nfs_strerror(status.nfsv2.fhs_status));
1615 memcpy(data.root.data,
1616 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1618 data.root.size = NFS_FHSIZE;
1619 memcpy(data.old_root.data,
1620 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1623 fhandle3 *my_fhandle;
1624 if (status.nfsv3.fhs_status != 0) {
1625 bb_error_msg("%s:%s failed, reason given by server: %s",
1627 nfs_strerror(status.nfsv3.fhs_status));
1630 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1631 memset(data.old_root.data, 0, NFS_FHSIZE);
1632 memset(&data.root, 0, sizeof(data.root));
1633 data.root.size = my_fhandle->fhandle3_len;
1634 memcpy(data.root.data,
1635 (char *) my_fhandle->fhandle3_val,
1636 my_fhandle->fhandle3_len);
1638 data.flags |= NFS_MOUNT_VER3;
1641 /* Create nfs socket for kernel */
1643 if (nfs_mount_version < 3) {
1644 bb_error_msg("NFS over TCP is not supported");
1647 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1649 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1651 bb_perror_msg("nfs socket");
1654 if (bindresvport(fsock, 0) < 0) {
1655 bb_perror_msg("nfs bindresvport");
1659 server_addr.sin_port = PMAPPORT;
1660 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1661 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1665 server_addr.sin_port = htons(port);
1667 /* Prepare data structure for kernel */
1669 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1670 strncpy(data.hostname, hostname, sizeof(data.hostname));
1673 auth_destroy(mclient->cl_auth);
1674 clnt_destroy(mclient);
1679 /* We must wait until mount directory is available */
1680 struct stat statbuf;
1682 while (stat(mp->mnt_dir, &statbuf) == -1) {
1684 daemonized = daemonize();
1685 if (daemonized <= 0) { /* parent or error */
1686 /* FIXME: parent doesn't close fsock - ??! */
1687 retval = -daemonized;
1691 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1698 /* Perform actual mount */
1700 retval = mount_it_now(mp, vfsflags, (char*)&data);
1707 auth_destroy(mclient->cl_auth);
1708 clnt_destroy(mclient);
1722 #else // !ENABLE_FEATURE_MOUNT_NFS
1724 /* Linux 2.6.23+ supports nfs mounts with options passed as a string.
1725 * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS.
1726 * (However, note that then you lose any chances that NFS over IPv6 would work).
1728 static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1730 len_and_sockaddr *lsa;
1736 # if ENABLE_FEATURE_IPV6
1737 end = strchr(mp->mnt_fsname, ']');
1738 if (end && end[1] == ':')
1742 /* mount_main() guarantees that ':' is there */
1743 end = strchr(mp->mnt_fsname, ':');
1746 lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0);
1748 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1749 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1750 opts = xasprintf("%s%saddr=%s",
1751 filteropts ? filteropts : "",
1752 filteropts ? "," : "",
1755 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1756 ret = mount_it_now(mp, vfsflags, opts);
1757 if (ENABLE_FEATURE_CLEAN_UP) free(opts);
1762 #endif // !ENABLE_FEATURE_MOUNT_NFS
1764 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1765 // type detection. Returns 0 for success, nonzero for failure.
1766 // NB: mp->xxx fields may be trashed on exit
1767 static int singlemount(struct mntent *mp, int ignore_busy)
1770 unsigned long vfsflags;
1771 char *loopFile = NULL, *filteropts = NULL;
1777 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1779 // Treat fstype "auto" as unspecified
1780 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1781 mp->mnt_type = NULL;
1783 // Might this be a virtual filesystem?
1784 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1788 // fsname: "cmd#arg1#arg2..."
1789 // WARNING: allows execution of arbitrary commands!
1790 // Try "mount 'sh#-c#sh' bogus_dir".
1791 // It is safe ONLY because non-root
1792 // cannot use two-argument mount command
1793 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1794 // "mount: can't find sh#-c#sh in /etc/fstab"
1795 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1800 while (*s && n < 35 - 2) {
1801 if (*s++ == '#' && *s != '#') {
1806 args[n++] = mp->mnt_dir;
1808 rc = spawn_and_wait(args);
1812 // Might this be an CIFS filesystem?
1813 if (ENABLE_FEATURE_MOUNT_CIFS
1814 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1815 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1816 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1820 len_and_sockaddr *lsa;
1821 char *hostname, *dotted, *ip;
1823 hostname = mp->mnt_fsname + 2;
1824 len = strcspn(hostname, "/\\");
1825 if (len == 0 || hostname[len] == '\0')
1828 hostname[len] = '\0';
1829 lsa = host2sockaddr(hostname, 0);
1834 // Insert "ip=..." option into options
1835 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1836 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1837 ip = xasprintf("ip=%s", dotted);
1838 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1839 parse_mount_options(ip, &filteropts);
1840 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1842 // "-o mand" is required [why?]
1843 vfsflags |= MS_MANDLOCK;
1844 mp->mnt_type = (char*)"cifs";
1845 rc = mount_it_now(mp, vfsflags, filteropts);
1850 // Might this be an NFS filesystem?
1851 if ((!mp->mnt_type || strncmp(mp->mnt_type, "nfs", 3) == 0)
1852 && strchr(mp->mnt_fsname, ':') != NULL
1855 mp->mnt_type = (char*)"nfs";
1856 rc = nfsmount(mp, vfsflags, filteropts);
1860 // Look at the file. (Not found isn't a failure for remount, or for
1861 // a synthetic filesystem like proc or sysfs.)
1862 // (We use stat, not lstat, in order to allow
1863 // mount symlink_to_file_or_blkdev dir)
1864 if (!stat(mp->mnt_fsname, &st)
1865 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1867 // Do we need to allocate a loopback device for it?
1868 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1869 loopFile = bb_simplify_path(mp->mnt_fsname);
1870 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1871 if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) {
1872 if (errno == EPERM || errno == EACCES)
1873 bb_error_msg(bb_msg_perm_denied_are_you_root);
1875 bb_perror_msg("can't setup loop device");
1879 // Autodetect bind mounts
1880 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1881 vfsflags |= MS_BIND;
1884 // If we know the fstype (or don't need to), jump straight
1885 // to the actual mount.
1886 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
1889 next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL;
1892 rc = mount_it_now(mp, vfsflags, filteropts);
1893 if (rc == 0 || !next)
1895 mp->mnt_type = next + 1;
1898 // Loop through filesystem types until mount succeeds
1901 // Initialize list of block backed filesystems.
1902 // This has to be done here so that during "mount -a",
1903 // mounts after /proc shows up can autodetect.
1905 fslist = get_block_backed_filesystems();
1906 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1907 atexit(delete_block_backed_filesystems);
1910 for (fl = fslist; fl; fl = fl->link) {
1911 mp->mnt_type = fl->data;
1912 rc = mount_it_now(mp, vfsflags, filteropts);
1918 // If mount failed, clean up loop file (if any).
1919 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1920 del_loop(mp->mnt_fsname);
1921 if (ENABLE_FEATURE_CLEAN_UP) {
1923 free(mp->mnt_fsname);
1928 if (ENABLE_FEATURE_CLEAN_UP)
1931 if (errno == EBUSY && ignore_busy)
1934 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1939 // -O interprets a list of filter options which select whether a mount
1940 // point will be mounted: only mounts with options matching *all* filtering
1941 // options will be selected.
1942 // By default each -O filter option must be present in the list of mount
1943 // options, but if it is prefixed by "no" then it must be absent.
1945 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1946 // (and also fails to match -o a because -o c is absent).
1948 // It is different from -t in that each option is matched exactly; a leading
1949 // "no" at the beginning of one option does not negate the rest.
1950 static int match_opt(const char *fs_opt_in, const char *O_opt)
1956 const char *fs_opt = fs_opt_in;
1960 // If option begins with "no" then treat as an inverted match:
1961 // matching is a failure
1963 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1967 // Isolate the current O option
1968 O_len = strchrnul(O_opt, ',') - O_opt;
1969 // Check for a match against existing options
1971 if (strncmp(fs_opt, O_opt, O_len) == 0
1972 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1975 return 0; // "no" prefix, but option found
1976 match = 1; // current O option found, go check next one
1979 fs_opt = strchr(fs_opt, ',');
1985 return 0; // match wanted but not found
1986 if (O_opt[O_len] == '\0') // end?
1988 // Step to the next O option
1991 // If we get here then everything matched
1995 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1996 // each directory to be mounted.
1997 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1998 int mount_main(int argc UNUSED_PARAM, char **argv)
2000 char *cmdopts = xzalloc(1);
2001 char *fstype = NULL;
2002 char *O_optmatch = NULL;
2004 llist_t *lst_o = NULL;
2005 const char *fstabname;
2008 int rc = EXIT_SUCCESS;
2009 unsigned long cmdopt_flags;
2011 struct mntent mtpair[2], *mtcur = mtpair;
2012 IF_NOT_DESKTOP(const int nonroot = 0;)
2014 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
2018 // Parse long options, like --bind and --move. Note that -o option
2019 // and --option are synonymous. Yes, this means --remount,rw works.
2020 for (i = j = 1; argv[i]; i++) {
2021 if (argv[i][0] == '-' && argv[i][1] == '-')
2022 append_mount_options(&cmdopts, argv[i] + 2);
2024 argv[j++] = argv[i];
2028 // Parse remaining options
2029 // Max 2 params; -o is a list, -v is a counter
2030 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
2031 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
2032 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
2033 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
2034 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
2035 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
2038 // If we have no arguments, show currently mounted filesystems
2040 if (!(opt & OPT_a)) {
2041 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
2044 bb_error_msg_and_die("no %s", bb_path_mtab_file);
2046 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
2049 // Don't show rootfs. FIXME: why??
2050 // util-linux 2.12a happily shows rootfs...
2051 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
2053 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
2054 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
2055 mtpair->mnt_dir, mtpair->mnt_type,
2058 if (ENABLE_FEATURE_CLEAN_UP)
2059 endmntent(mountTable);
2060 return EXIT_SUCCESS;
2062 storage_path = NULL;
2064 // When we have two arguments, the second is the directory and we can
2065 // skip looking at fstab entirely. We can always abspath() the directory
2066 // argument when we get it.
2069 bb_error_msg_and_die(bb_msg_you_must_be_root);
2070 mtpair->mnt_fsname = argv[0];
2071 mtpair->mnt_dir = argv[1];
2072 mtpair->mnt_type = fstype;
2073 mtpair->mnt_opts = cmdopts;
2074 resolve_mount_spec(&mtpair->mnt_fsname);
2075 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
2078 storage_path = bb_simplify_path(argv[0]); // malloced
2081 // Past this point, we are handling either "mount -a [opts]"
2082 // or "mount [opts] single_param"
2084 cmdopt_flags = parse_mount_options(cmdopts, NULL);
2085 if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags
2086 bb_error_msg_and_die(bb_msg_you_must_be_root);
2088 // If we have a shared subtree flag, don't worry about fstab or mtab.
2089 if (ENABLE_FEATURE_MOUNT_FLAGS
2090 && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2092 // verbose_mount(source, target, type, flags, data)
2093 rc = verbose_mount("", argv[0], "", cmdopt_flags, "");
2095 bb_simple_perror_msg_and_die(argv[0]);
2099 // Open either fstab or mtab
2100 fstabname = "/etc/fstab";
2101 if (cmdopt_flags & MS_REMOUNT) {
2102 // WARNING. I am not sure this matches util-linux's
2103 // behavior. It's possible util-linux does not
2104 // take -o opts from mtab (takes only mount source).
2105 fstabname = bb_path_mtab_file;
2107 fstab = setmntent(fstabname, "r");
2109 bb_perror_msg_and_die("can't read '%s'", fstabname);
2111 // Loop through entries until we find what we're looking for
2112 memset(mtpair, 0, sizeof(mtpair));
2114 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
2116 // Get next fstab entry
2117 if (!getmntent_r(fstab, mtcur, getmntent_buf
2118 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
2119 GETMNTENT_BUFSIZE/2)
2120 ) { // End of fstab/mtab is reached
2121 mtcur = mtother; // the thing we found last time
2125 // If we're trying to mount something specific and this isn't it,
2126 // skip it. Note we must match the exact text in fstab (ala
2127 // "proc") or a full path from root
2130 // Is this what we're looking for?
2131 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
2132 && strcmp(storage_path, mtcur->mnt_fsname) != 0
2133 && strcmp(argv[0], mtcur->mnt_dir) != 0
2134 && strcmp(storage_path, mtcur->mnt_dir) != 0
2139 // Remember this entry. Something later may have
2140 // overmounted it, and we want the _last_ match.
2143 // If we're mounting all
2146 // No, mount -a won't mount anything,
2147 // even user mounts, for mere humans
2149 bb_error_msg_and_die(bb_msg_you_must_be_root);
2151 // Does type match? (NULL matches always)
2152 if (!match_fstype(mtcur, fstype))
2155 // Skip noauto and swap anyway
2156 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
2157 // swap is bogus "fstype", parse_mount_options can't check fstypes
2158 || strcasecmp(mtcur->mnt_type, "swap") == 0
2163 // Does (at least one) option match?
2164 // (NULL matches always)
2165 if (!match_opt(mtcur->mnt_opts, O_optmatch))
2168 resolve_mount_spec(&mtcur->mnt_fsname);
2170 // NFS mounts want this to be xrealloc-able
2171 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2173 // If nothing is mounted on this directory...
2174 // (otherwise repeated "mount -a" mounts everything again)
2175 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2176 // We do not check fsname match of found mount point -
2177 // "/" may have fsname of "/dev/root" while fstab
2178 // says "/dev/something_else".
2181 bb_error_msg("according to %s, "
2182 "%s is already mounted on %s",
2184 mp->mnt_fsname, mp->mnt_dir);
2187 // ...mount this thing
2188 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2189 // Count number of failed mounts
2193 free(mtcur->mnt_opts);
2197 // End of fstab/mtab is reached.
2198 // Were we looking for something specific?
2199 if (argv[0]) { // yes
2202 // If we didn't find anything, complain
2203 if (!mtcur->mnt_fsname)
2204 bb_error_msg_and_die("can't find %s in %s",
2205 argv[0], fstabname);
2207 // What happens when we try to "mount swap_partition"?
2208 // (fstab containts "swap_partition swap swap defaults 0 0")
2209 // util-linux-ng 2.13.1 does this:
2210 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2211 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2212 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2213 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2214 // exit_group(32) = ?
2216 // In case we want to simply skip swap partitions:
2217 l = parse_mount_options(mtcur->mnt_opts, NULL);
2218 if ((l & MOUNT_SWAP)
2219 // swap is bogus "fstype", parse_mount_options can't check fstypes
2220 || strcasecmp(mtcur->mnt_type, "swap") == 0
2226 // fstab must have "users" or "user"
2227 l = parse_mount_options(mtcur->mnt_opts, NULL);
2228 if (!(l & MOUNT_USERS))
2229 bb_error_msg_and_die(bb_msg_you_must_be_root);
2232 //util-linux-2.12 does not do this check.
2233 //// If nothing is mounted on this directory...
2234 //// (otherwise repeated "mount FOO" mounts FOO again)
2235 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2237 // bb_error_msg("according to %s, "
2238 // "%s is already mounted on %s",
2239 // bb_path_mtab_file,
2240 // mp->mnt_fsname, mp->mnt_dir);
2242 // ...mount the last thing we found
2243 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2244 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2245 resolve_mount_spec(&mtpair->mnt_fsname);
2246 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2247 if (ENABLE_FEATURE_CLEAN_UP)
2248 free(mtcur->mnt_opts);
2253 if (ENABLE_FEATURE_CLEAN_UP)
2255 if (ENABLE_FEATURE_CLEAN_UP) {
2260 //TODO: exitcode should be ORed mask of (from "man mount"):
2262 // 1 incorrect invocation or permissions
2263 // 2 system error (out of memory, cannot fork, no more loop devices)
2264 // 4 internal mount bug or missing nfs support in mount
2266 //16 problems writing or locking /etc/mtab
2268 //64 some mount succeeded