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)
118 #if ENABLE_FEATURE_MOUNT_LABEL
119 # include "volume_id.h"
121 # define resolve_mount_spec(fsname) ((void)0)
124 // Needed for nfs support only
125 #include <sys/utsname.h>
128 #if ENABLE_FEATURE_MOUNT_NFS
129 /* This is just a warning of a common mistake. Possibly this should be a
130 * uclibc faq entry rather than in busybox... */
131 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
132 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
134 # include <rpc/rpc.h>
135 # include <rpc/pmap_prot.h>
136 # include <rpc/pmap_clnt.h>
140 #if defined(__dietlibc__)
141 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
142 // dietlibc-0.30 does not have implementation of getmntent_r()
143 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
144 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
146 struct mntent* ment = getmntent(stream);
147 return memcpy(result, ment, sizeof(*ment));
152 // Not real flags, but we want to be able to check for this.
154 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
155 MOUNT_NOAUTO = (1 << 29),
156 MOUNT_SWAP = (1 << 30),
160 #define OPTION_STR "o:t:rwanfvsiO:"
175 #if ENABLE_FEATURE_MTAB_SUPPORT
176 #define USE_MTAB (!(option_mask32 & OPT_n))
181 #if ENABLE_FEATURE_MOUNT_FAKE
182 #define FAKE_IT (option_mask32 & OPT_f)
187 #if ENABLE_FEATURE_MOUNT_HELPERS
188 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
190 #define HELPERS_ALLOWED 0
194 // TODO: more "user" flag compatibility.
195 // "user" option (from mount manpage):
196 // Only the user that mounted a filesystem can unmount it again.
197 // If any user should be able to unmount, then use users instead of user
198 // in the fstab line. The owner option is similar to the user option,
199 // with the restriction that the user must be the owner of the special file.
200 // This may be useful e.g. for /dev/fd if a login script makes
201 // the console user owner of this device.
203 // Standard mount options (from -o options or --options),
204 // with corresponding flags
205 static const int32_t mount_options[] = {
206 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
208 IF_FEATURE_MOUNT_LOOP(
212 IF_FEATURE_MOUNT_FSTAB(
214 /* "quiet" 0 - do not filter out, vfat wants to see it */
215 /* "noauto" */ MOUNT_NOAUTO,
216 /* "sw" */ MOUNT_SWAP,
217 /* "swap" */ MOUNT_SWAP,
218 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
219 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
223 IF_FEATURE_MOUNT_FLAGS(
225 /* "nosuid" */ MS_NOSUID,
226 /* "suid" */ ~MS_NOSUID,
227 /* "dev" */ ~MS_NODEV,
228 /* "nodev" */ MS_NODEV,
229 /* "exec" */ ~MS_NOEXEC,
230 /* "noexec" */ MS_NOEXEC,
231 /* "sync" */ MS_SYNCHRONOUS,
232 /* "dirsync" */ MS_DIRSYNC,
233 /* "async" */ ~MS_SYNCHRONOUS,
234 /* "atime" */ ~MS_NOATIME,
235 /* "noatime" */ MS_NOATIME,
236 /* "diratime" */ ~MS_NODIRATIME,
237 /* "nodiratime" */ MS_NODIRATIME,
238 /* "mand" */ MS_MANDLOCK,
239 /* "nomand" */ ~MS_MANDLOCK,
240 /* "relatime" */ MS_RELATIME,
241 /* "norelatime" */ ~MS_RELATIME,
242 /* "loud" */ ~MS_SILENT,
243 /* "rbind" */ MS_BIND|MS_RECURSIVE,
246 /* "union" */ MS_UNION,
247 /* "bind" */ MS_BIND,
248 /* "move" */ MS_MOVE,
249 /* "shared" */ MS_SHARED,
250 /* "slave" */ MS_SLAVE,
251 /* "private" */ MS_PRIVATE,
252 /* "unbindable" */ MS_UNBINDABLE,
253 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
254 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
255 /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
256 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
259 // Always understood.
260 /* "ro" */ MS_RDONLY, // vfs flag
261 /* "rw" */ ~MS_RDONLY, // vfs flag
262 /* "remount" */ MS_REMOUNT // action flag
265 static const char mount_option_str[] =
266 IF_FEATURE_MOUNT_LOOP(
269 IF_FEATURE_MOUNT_FSTAB(
271 // "quiet\0" - do not filter out, vfat wants to see it
276 IF_DESKTOP("users\0")
279 IF_FEATURE_MOUNT_FLAGS(
315 // Always understood.
318 "remount\0" // action flag
323 #if ENABLE_FEATURE_MOUNT_NFS
324 smalluint nfs_mount_version;
326 #if ENABLE_FEATURE_MOUNT_VERBOSE
330 char getmntent_buf[1];
332 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
333 #define G (*(struct globals*)&bb_common_bufsiz1)
334 #define nfs_mount_version (G.nfs_mount_version)
335 #if ENABLE_FEATURE_MOUNT_VERBOSE
336 #define verbose (G.verbose )
340 #define fslist (G.fslist )
341 #define getmntent_buf (G.getmntent_buf )
342 #define INIT_G() do { } while (0)
344 #if ENABLE_FEATURE_MTAB_SUPPORT
346 * update_mtab_entry_on_move() is used to update entry in case of mount --move.
347 * we are looking for existing entries mnt_dir which is equal to mnt_fsname of
348 * input mntent and replace it by new one.
350 static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
352 struct mntent *entries, *m;
356 mountTable = setmntent(bb_path_mtab_file, "r");
358 bb_perror_msg(bb_path_mtab_file);
364 while ((m = getmntent(mountTable)) != NULL) {
365 entries = xrealloc_vector(entries, 3, count);
366 entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
367 entries[count].mnt_dir = xstrdup(m->mnt_dir);
368 entries[count].mnt_type = xstrdup(m->mnt_type);
369 entries[count].mnt_opts = xstrdup(m->mnt_opts);
370 entries[count].mnt_freq = m->mnt_freq;
371 entries[count].mnt_passno = m->mnt_passno;
374 endmntent(mountTable);
376 mountTable = setmntent(bb_path_mtab_file, "w");
378 for (i = 0; i < count; i++) {
379 if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
380 addmntent(mountTable, &entries[i]);
382 addmntent(mountTable, mp);
384 endmntent(mountTable);
385 } else if (errno != EROFS)
386 bb_perror_msg(bb_path_mtab_file);
388 if (ENABLE_FEATURE_CLEAN_UP) {
389 for (i = 0; i < count; i++) {
390 free(entries[i].mnt_fsname);
391 free(entries[i].mnt_dir);
392 free(entries[i].mnt_type);
393 free(entries[i].mnt_opts);
400 #if ENABLE_FEATURE_MOUNT_VERBOSE
401 static int verbose_mount(const char *source, const char *target,
402 const char *filesystemtype,
403 unsigned long mountflags, const void *data)
408 rc = mount(source, target, filesystemtype, mountflags, data);
410 bb_perror_msg("mount('%s','%s','%s',0x%08lx,'%s'):%d",
411 source, target, filesystemtype,
412 mountflags, (char*)data, rc);
416 #define verbose_mount(...) mount(__VA_ARGS__)
419 // Append mount options to string
420 static void append_mount_options(char **oldopts, const char *newopts)
422 if (*oldopts && **oldopts) {
423 // Do not insert options which are already there
426 int len = strlen(newopts);
427 p = strchr(newopts, ',');
428 if (p) len = p - newopts;
431 if (!strncmp(p, newopts, len)
432 && (p[len] == ',' || p[len] == '\0'))
438 p = xasprintf("%s,%.*s", *oldopts, len, newopts);
443 while (newopts[0] == ',') newopts++;
446 if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts);
447 *oldopts = xstrdup(newopts);
451 // Use the mount_options list to parse options into flags.
452 // Also update list of unrecognized options if unrecognized != NULL
453 static unsigned long parse_mount_options(char *options, char **unrecognized)
455 unsigned long flags = MS_SILENT;
457 // Loop through options
460 char *comma = strchr(options, ',');
461 const char *option_str = mount_option_str;
463 if (comma) *comma = '\0';
465 // FIXME: use hasmntopt()
466 // Find this option in mount_options
467 for (i = 0; i < ARRAY_SIZE(mount_options); i++) {
468 if (strcasecmp(option_str, options) == 0) {
469 unsigned long fl = mount_options[i];
476 option_str += strlen(option_str) + 1;
478 // We did not recognize this option.
479 // If "unrecognized" is not NULL, append option there.
480 // Note that we should not append *empty* option -
481 // in this case we want to pass NULL, not "", to "data"
482 // parameter of mount(2) syscall.
483 // This is crucial for filesystems that don't accept
484 // any arbitrary mount options, like cgroup fs:
485 // "mount -t cgroup none /mnt"
486 if (options[0] && unrecognized) {
487 // Add it to strflags, to pass on to kernel
488 char *p = *unrecognized;
489 unsigned len = p ? strlen(p) : 0;
490 *unrecognized = p = xrealloc(p, len + strlen(options) + 2);
492 // Comma separated if it's not the first one
493 if (len) p[len++] = ',';
494 strcpy(p + len, options);
499 // Advance to next option
507 // Return a list of all block device backed filesystems
508 static llist_t *get_block_backed_filesystems(void)
510 static const char filesystems[2][sizeof("/proc/filesystems")] = {
515 llist_t *list = NULL;
519 for (i = 0; i < 2; i++) {
520 f = fopen_for_read(filesystems[i]);
523 while ((buf = xmalloc_fgetline(f)) != NULL) {
524 if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
526 fs = skip_whitespace(buf);
527 if (*fs == '#' || *fs == '*' || !*fs)
530 llist_add_to_end(&list, xstrdup(fs));
534 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
540 #if ENABLE_FEATURE_CLEAN_UP
541 static void delete_block_backed_filesystems(void)
543 llist_free(fslist, free);
546 void delete_block_backed_filesystems(void);
549 // Perform actual mount of specific filesystem at specific location.
550 // NB: mp->xxx fields may be trashed on exit
551 static int mount_it_now(struct mntent *mp, unsigned long vfsflags, char *filteropts)
557 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
558 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
559 vfsflags, filteropts);
563 // Mount, with fallback to read-only if necessary.
566 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
567 vfsflags, filteropts);
569 // If mount failed, try
570 // helper program mount.<mnt_type>
571 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
573 int errno_save = errno;
574 args[0] = xasprintf("mount.%s", mp->mnt_type);
577 args[rc++] = (char *)"-f";
578 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
579 args[rc++] = (char *)"-n";
580 args[rc++] = mp->mnt_fsname;
581 args[rc++] = mp->mnt_dir;
583 args[rc++] = (char *)"-o";
584 args[rc++] = filteropts;
587 rc = spawn_and_wait(args);
594 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
596 if (!(vfsflags & MS_SILENT))
597 bb_error_msg("%s is write-protected, mounting read-only",
599 vfsflags |= MS_RDONLY;
602 // Abort entirely if permission denied.
604 if (rc && errno == EPERM)
605 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
607 // If the mount was successful, and we're maintaining an old-style
608 // mtab file by hand, add the new entry to it now.
610 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
612 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
613 const char *option_str = mount_option_str;
617 bb_perror_msg(bb_path_mtab_file);
621 // Add vfs string flags
622 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
623 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
624 append_mount_options(&(mp->mnt_opts), option_str);
625 option_str += strlen(option_str) + 1;
628 // Remove trailing / (if any) from directory we mounted on
629 i = strlen(mp->mnt_dir) - 1;
630 while (i > 0 && mp->mnt_dir[i] == '/')
631 mp->mnt_dir[i--] = '\0';
633 // Convert to canonical pathnames as needed
634 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
636 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
637 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
638 mp->mnt_type = (char*)"bind";
640 mp->mnt_freq = mp->mnt_passno = 0;
643 #if ENABLE_FEATURE_MTAB_SUPPORT
644 if (vfsflags & MS_MOVE)
645 update_mtab_entry_on_move(mp);
648 addmntent(mountTable, mp);
649 endmntent(mountTable);
651 if (ENABLE_FEATURE_CLEAN_UP) {
660 #if ENABLE_FEATURE_MOUNT_NFS
664 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
666 * Licensed under GPLv2, see file LICENSE in this source tree.
668 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
669 * numbers to be specified on the command line.
671 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
672 * Omit the call to connect() for Linux version 1.3.11 or later.
674 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
675 * Implemented the "bg", "fg" and "retry" mount options for NFS.
677 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
678 * - added Native Language Support
680 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
684 #define MOUNTPORT 635
685 #define MNTPATHLEN 1024
686 #define MNTNAMLEN 255
690 typedef char fhandle[FHSIZE];
693 unsigned int fhandle3_len;
705 MNT3ERR_NAMETOOLONG = 63,
706 MNT3ERR_NOTSUPP = 10004,
707 MNT3ERR_SERVERFAULT = 10006,
709 typedef enum mountstat3 mountstat3;
712 unsigned int fhs_status;
717 typedef struct fhstatus fhstatus;
719 struct mountres3_ok {
722 unsigned int auth_flavours_len;
723 char *auth_flavours_val;
726 typedef struct mountres3_ok mountres3_ok;
729 mountstat3 fhs_status;
731 mountres3_ok mountinfo;
734 typedef struct mountres3 mountres3;
736 typedef char *dirpath;
740 typedef struct mountbody *mountlist;
744 dirpath ml_directory;
747 typedef struct mountbody mountbody;
749 typedef struct groupnode *groups;
755 typedef struct groupnode groupnode;
757 typedef struct exportnode *exports;
764 typedef struct exportnode exportnode;
777 typedef struct ppathcnf ppathcnf;
779 #define MOUNTPROG 100005
782 #define MOUNTPROC_NULL 0
783 #define MOUNTPROC_MNT 1
784 #define MOUNTPROC_DUMP 2
785 #define MOUNTPROC_UMNT 3
786 #define MOUNTPROC_UMNTALL 4
787 #define MOUNTPROC_EXPORT 5
788 #define MOUNTPROC_EXPORTALL 6
790 #define MOUNTVERS_POSIX 2
792 #define MOUNTPROC_PATHCONF 7
796 #define MOUNTPROC3_NULL 0
797 #define MOUNTPROC3_MNT 1
798 #define MOUNTPROC3_DUMP 2
799 #define MOUNTPROC3_UMNT 3
800 #define MOUNTPROC3_UMNTALL 4
801 #define MOUNTPROC3_EXPORT 5
813 * We want to be able to compile mount on old kernels in such a way
814 * that the binary will work well on more recent kernels.
815 * Thus, if necessary we teach nfsmount.c the structure of new fields
816 * that will come later.
818 * Moreover, the new kernel includes conflict with glibc includes
819 * so it is easiest to ignore the kernel altogether (at compile time).
827 unsigned char data[64];
830 struct nfs_mount_data {
833 struct nfs2_fh old_root; /* 1 */
839 int acregmin; /* 1 */
840 int acregmax; /* 1 */
841 int acdirmin; /* 1 */
842 int acdirmax; /* 1 */
843 struct sockaddr_in addr; /* 1 */
844 char hostname[256]; /* 1 */
846 unsigned int bsize; /* 3 */
847 struct nfs3_fh root; /* 4 */
850 /* bits in the flags field */
852 NFS_MOUNT_SOFT = 0x0001, /* 1 */
853 NFS_MOUNT_INTR = 0x0002, /* 1 */
854 NFS_MOUNT_SECURE = 0x0004, /* 1 */
855 NFS_MOUNT_POSIX = 0x0008, /* 1 */
856 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
857 NFS_MOUNT_NOAC = 0x0020, /* 1 */
858 NFS_MOUNT_TCP = 0x0040, /* 2 */
859 NFS_MOUNT_VER3 = 0x0080, /* 3 */
860 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
861 NFS_MOUNT_NONLM = 0x0200, /* 3 */
862 NFS_MOUNT_NOACL = 0x0800, /* 4 */
863 NFS_MOUNT_NORDIRPLUS = 0x4000
868 * We need to translate between nfs status return values and
869 * the local errno values which may not be the same.
871 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
872 * "after #include <errno.h> the symbol errno is reserved for any use,
873 * it cannot even be used as a struct tag or field name".
876 # define EDQUOT ENOSPC
878 /* Convert each NFSERR_BLAH into EBLAH */
879 static const uint8_t nfs_err_stat[] = {
881 19, 20, 21, 22, 27, 28,
882 30, 63, 66, 69, 70, 71
885 EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
886 ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
887 EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
888 typedef uint8_t nfs_err_type;
890 typedef uint16_t nfs_err_type;
892 static const nfs_err_type nfs_err_errnum[] = {
893 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
894 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
895 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
897 static char *nfs_strerror(int status)
901 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
902 if (nfs_err_stat[i] == status)
903 return strerror(nfs_err_errnum[i]);
905 return xasprintf("unknown nfs status return value: %d", status);
908 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
910 return xdr_opaque(xdrs, objp, FHSIZE);
913 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
915 if (!xdr_u_int(xdrs, &objp->fhs_status))
917 if (objp->fhs_status == 0)
918 return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
922 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
924 return xdr_string(xdrs, objp, MNTPATHLEN);
927 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
929 return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
930 (unsigned int *) &objp->fhandle3_len,
934 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
936 if (!xdr_fhandle3(xdrs, &objp->fhandle))
938 return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
939 &(objp->auth_flavours.auth_flavours_len),
942 (xdrproc_t) xdr_int);
945 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
947 return xdr_enum(xdrs, (enum_t *) objp);
950 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
952 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
954 if (objp->fhs_status == MNT_OK)
955 return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
959 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
962 * Unfortunately, the kernel prints annoying console messages
963 * in case of an unexpected nfs mount version (instead of
964 * just returning some error). Therefore we'll have to try
965 * and figure out what version the kernel expects.
968 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
969 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
970 * nfs_mount_version: version this source and running kernel can handle
973 find_kernel_nfs_mount_version(void)
977 if (nfs_mount_version)
980 nfs_mount_version = 4; /* default */
982 kernel_version = get_linux_version_code();
983 if (kernel_version) {
984 if (kernel_version < KERNEL_VERSION(2,2,18))
985 nfs_mount_version = 3;
986 /* else v4 since 2.3.99pre4 */
991 get_mountport(struct pmap *pm_mnt,
992 struct sockaddr_in *server_addr,
994 long unsigned version,
998 struct pmaplist *pmap;
1000 server_addr->sin_port = PMAPPORT;
1001 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
1002 * I understand it like "IPv6 for this is not 100% ready" */
1003 pmap = pmap_getmaps(server_addr);
1005 if (version > MAX_NFSPROT)
1006 version = MAX_NFSPROT;
1009 pm_mnt->pm_prog = prog;
1010 pm_mnt->pm_vers = version;
1011 pm_mnt->pm_prot = proto;
1012 pm_mnt->pm_port = port;
1015 if (pmap->pml_map.pm_prog != prog)
1017 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
1019 if (version > 2 && pmap->pml_map.pm_vers != version)
1021 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
1023 if (pmap->pml_map.pm_vers > MAX_NFSPROT
1024 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
1025 || (port && pmap->pml_map.pm_port != port)
1029 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
1031 pmap = pmap->pml_next;
1033 if (!pm_mnt->pm_vers)
1034 pm_mnt->pm_vers = MOUNTVERS;
1035 if (!pm_mnt->pm_port)
1036 pm_mnt->pm_port = MOUNTPORT;
1037 if (!pm_mnt->pm_prot)
1038 pm_mnt->pm_prot = IPPROTO_TCP;
1042 static int daemonize(void)
1045 if (pid < 0) /* error */
1047 if (pid > 0) /* parent */
1051 xopen(bb_dev_null, O_RDWR);
1055 openlog(applet_name, LOG_PID, LOG_DAEMON);
1056 logmode = LOGMODE_SYSLOG;
1060 static inline int daemonize(void) { return -ENOSYS; }
1064 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
1069 /* RPC strerror analogs are terminally idiotic:
1070 * *mandatory* prefix and \n at end.
1071 * This hopefully helps. Usage:
1072 * error_msg_rpc(clnt_*error*(" ")) */
1073 static void error_msg_rpc(const char *msg)
1076 while (msg[0] == ' ' || msg[0] == ':') msg++;
1078 while (len && msg[len-1] == '\n') len--;
1079 bb_error_msg("%.*s", len, msg);
1082 /* NB: mp->xxx fields may be trashed on exit */
1083 static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1089 /* prior to 2.6.23, kernel took NFS options in a form of this struct
1090 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
1091 * then data pointer is interpreted as a string. */
1092 struct nfs_mount_data data;
1095 struct sockaddr_in server_addr;
1096 struct sockaddr_in mount_server_addr;
1099 struct fhstatus nfsv2;
1100 struct mountres3 nfsv3;
1118 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1129 find_kernel_nfs_mount_version();
1137 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1139 filteropts = xstrdup(filteropts); /* going to trash it later... */
1141 hostname = xstrdup(mp->mnt_fsname);
1142 /* mount_main() guarantees that ':' is there */
1143 s = strchr(hostname, ':');
1146 /* Ignore all but first hostname in replicated mounts
1147 * until they can be fully supported. (mack@sgi.com) */
1148 s = strchr(hostname, ',');
1151 bb_error_msg("warning: multiple hostnames not supported");
1154 server_addr.sin_family = AF_INET;
1155 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1156 hp = gethostbyname(hostname);
1158 bb_herror_msg("%s", hostname);
1161 if (hp->h_length != (int)sizeof(struct in_addr)) {
1162 bb_error_msg_and_die("only IPv4 is supported");
1164 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1167 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1169 /* add IP address to mtab options for use when unmounting */
1171 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1172 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1174 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1175 mp->mnt_opts[0] ? "," : "",
1176 inet_ntoa(server_addr.sin_addr));
1181 /* Set default options.
1182 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1183 * let the kernel decide.
1184 * timeo is filled in after we know whether it'll be TCP or UDP. */
1185 memset(&data, 0, sizeof(data));
1191 data.namlen = NAME_MAX;
1201 retry = 10000; /* 10000 minutes ~ 1 week */
1202 tcp = 1; /* nfs-utils uses tcp per default */
1204 mountprog = MOUNTPROG;
1212 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1213 char *opteq = strchr(opt, '=');
1216 static const char options[] ALIGN1 =
1221 /* 4 */ "acregmin\0"
1222 /* 5 */ "acregmax\0"
1223 /* 6 */ "acdirmin\0"
1224 /* 7 */ "acdirmax\0"
1228 /* 11 */ "mountport\0"
1229 /* 12 */ "mounthost\0"
1230 /* 13 */ "mountprog\0"
1231 /* 14 */ "mountvers\0"
1232 /* 15 */ "nfsprog\0"
1233 /* 16 */ "nfsvers\0"
1240 idx = index_in_strings(options, opt);
1242 case 12: // "mounthost"
1243 mounthost = xstrndup(opteq,
1244 strcspn(opteq, " \t\n\r,"));
1247 if (!strncmp(opteq, "tcp", 3))
1249 else if (!strncmp(opteq, "udp", 3))
1252 bb_error_msg("warning: unrecognized proto= option");
1254 case 20: // "addr" - ignore
1257 if (vfsflags & MS_REMOUNT)
1261 val = xatoi_positive(opteq);
1272 case 3: // "retrans"
1275 case 4: // "acregmin"
1276 data.acregmin = val;
1278 case 5: // "acregmax"
1279 data.acregmax = val;
1281 case 6: // "acdirmin"
1282 data.acdirmin = val;
1284 case 7: // "acdirmax"
1285 data.acdirmax = val;
1287 case 8: // "actimeo"
1288 data.acregmin = val;
1289 data.acregmax = val;
1290 data.acdirmin = val;
1291 data.acdirmax = val;
1299 case 11: // "mountport"
1302 case 13: // "mountprog"
1305 case 14: // "mountvers"
1308 case 15: // "nfsprog"
1311 case 16: // "nfsvers"
1315 case 19: // "namlen"
1316 //if (nfs_mount_version >= 2)
1319 // bb_error_msg("warning: option namlen is not supported\n");
1322 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1326 else { /* not of the form opt=val */
1327 static const char options[] ALIGN1 =
1342 if (!strncmp(opt, "no", 2)) {
1346 switch (index_in_strings(options, opt)) {
1382 if (nfs_mount_version >= 3)
1385 bb_error_msg("warning: option nolock is not supported");
1394 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1399 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1401 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1402 | (intr ? NFS_MOUNT_INTR : 0)
1403 | (posix ? NFS_MOUNT_POSIX : 0)
1404 | (nocto ? NFS_MOUNT_NOCTO : 0)
1405 | (noac ? NFS_MOUNT_NOAC : 0)
1406 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0)
1407 | (noacl ? NFS_MOUNT_NOACL : 0);
1408 if (nfs_mount_version >= 2)
1409 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1410 if (nfs_mount_version >= 3)
1411 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1412 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1413 bb_error_msg("NFSv%d not supported", nfsvers);
1416 if (nfsvers && !mountvers)
1417 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1418 if (nfsvers && nfsvers < mountvers) {
1419 mountvers = nfsvers;
1422 /* Adjust options if none specified */
1424 data.timeo = tcp ? 70 : 7;
1426 data.version = nfs_mount_version;
1428 if (vfsflags & MS_REMOUNT)
1432 * If the previous mount operation on the same host was
1433 * backgrounded, and the "bg" for this mount is also set,
1434 * give up immediately, to avoid the initial timeout.
1436 if (bg && we_saw_this_host_before(hostname)) {
1437 daemonized = daemonize();
1438 if (daemonized <= 0) { /* parent or error */
1439 retval = -daemonized;
1444 /* Create mount daemon client */
1445 /* See if the nfs host = mount host. */
1447 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1448 mount_server_addr.sin_family = AF_INET;
1449 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1451 hp = gethostbyname(mounthost);
1453 bb_herror_msg("%s", mounthost);
1456 if (hp->h_length != (int)sizeof(struct in_addr)) {
1457 bb_error_msg_and_die("only IPv4 is supported");
1459 mount_server_addr.sin_family = AF_INET;
1460 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1465 * The following loop implements the mount retries. When the mount
1466 * times out, and the "bg" option is set, we background ourself
1467 * and continue trying.
1469 * The case where the mount point is not present and the "bg"
1470 * option is set, is treated as a timeout. This is done to
1471 * support nested mounts.
1473 * The "retry" count specified by the user is the number of
1474 * minutes to retry before giving up.
1477 struct timeval total_timeout;
1478 struct timeval retry_timeout;
1484 retry_timeout.tv_sec = 3;
1485 retry_timeout.tv_usec = 0;
1486 total_timeout.tv_sec = 20;
1487 total_timeout.tv_usec = 0;
1488 /* FIXME: use monotonic()? */
1489 timeout = time(NULL) + 60 * retry;
1493 /* Be careful not to use too many CPU cycles */
1497 get_mountport(&pm_mnt, &mount_server_addr,
1502 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1504 /* contact the mount daemon via TCP */
1505 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1506 msock = RPC_ANYSOCK;
1508 switch (pm_mnt.pm_prot) {
1510 mclient = clntudp_create(&mount_server_addr,
1517 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1518 msock = RPC_ANYSOCK;
1520 mclient = clnttcp_create(&mount_server_addr,
1529 if (!daemonized && prevt == 0)
1530 error_msg_rpc(clnt_spcreateerror(" "));
1532 enum clnt_stat clnt_stat;
1534 /* Try to mount hostname:pathname */
1535 mclient->cl_auth = authunix_create_default();
1537 /* Make pointers in xdr_mountres3 NULL so
1538 * that xdr_array allocates memory for us
1540 memset(&status, 0, sizeof(status));
1542 if (pm_mnt.pm_vers == 3)
1543 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1544 (xdrproc_t) xdr_dirpath,
1545 (caddr_t) &pathname,
1546 (xdrproc_t) xdr_mountres3,
1550 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1551 (xdrproc_t) xdr_dirpath,
1552 (caddr_t) &pathname,
1553 (xdrproc_t) xdr_fhstatus,
1557 if (clnt_stat == RPC_SUCCESS)
1558 goto prepare_kernel_data; /* we're done */
1559 if (errno != ECONNREFUSED) {
1560 error_msg_rpc(clnt_sperror(mclient, " "));
1561 goto fail; /* don't retry */
1563 /* Connection refused */
1564 if (!daemonized && prevt == 0) /* print just once */
1565 error_msg_rpc(clnt_sperror(mclient, " "));
1566 auth_destroy(mclient->cl_auth);
1567 clnt_destroy(mclient);
1573 /* Timeout. We are going to retry... maybe */
1577 daemonized = daemonize();
1578 if (daemonized <= 0) { /* parent or error */
1579 retval = -daemonized;
1586 /* TODO error message */
1592 prepare_kernel_data:
1595 if (status.nfsv2.fhs_status != 0) {
1596 bb_error_msg("%s:%s failed, reason given by server: %s",
1598 nfs_strerror(status.nfsv2.fhs_status));
1601 memcpy(data.root.data,
1602 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1604 data.root.size = NFS_FHSIZE;
1605 memcpy(data.old_root.data,
1606 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1609 fhandle3 *my_fhandle;
1610 if (status.nfsv3.fhs_status != 0) {
1611 bb_error_msg("%s:%s failed, reason given by server: %s",
1613 nfs_strerror(status.nfsv3.fhs_status));
1616 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1617 memset(data.old_root.data, 0, NFS_FHSIZE);
1618 memset(&data.root, 0, sizeof(data.root));
1619 data.root.size = my_fhandle->fhandle3_len;
1620 memcpy(data.root.data,
1621 (char *) my_fhandle->fhandle3_val,
1622 my_fhandle->fhandle3_len);
1624 data.flags |= NFS_MOUNT_VER3;
1627 /* Create nfs socket for kernel */
1629 if (nfs_mount_version < 3) {
1630 bb_error_msg("NFS over TCP is not supported");
1633 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1635 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1637 bb_perror_msg("nfs socket");
1640 if (bindresvport(fsock, 0) < 0) {
1641 bb_perror_msg("nfs bindresvport");
1645 server_addr.sin_port = PMAPPORT;
1646 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1647 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1651 server_addr.sin_port = htons(port);
1653 /* Prepare data structure for kernel */
1655 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1656 strncpy(data.hostname, hostname, sizeof(data.hostname));
1659 auth_destroy(mclient->cl_auth);
1660 clnt_destroy(mclient);
1665 /* We must wait until mount directory is available */
1666 struct stat statbuf;
1668 while (stat(mp->mnt_dir, &statbuf) == -1) {
1670 daemonized = daemonize();
1671 if (daemonized <= 0) { /* parent or error */
1672 /* FIXME: parent doesn't close fsock - ??! */
1673 retval = -daemonized;
1677 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1684 /* Perform actual mount */
1686 retval = mount_it_now(mp, vfsflags, (char*)&data);
1693 auth_destroy(mclient->cl_auth);
1694 clnt_destroy(mclient);
1708 #else // !ENABLE_FEATURE_MOUNT_NFS
1710 /* Linux 2.6.23+ supports nfs mounts with options passed as a string.
1711 * For older kernels, you must build busybox with ENABLE_FEATURE_MOUNT_NFS.
1712 * (However, note that then you lose any chances that NFS over IPv6 would work).
1714 static int nfsmount(struct mntent *mp, unsigned long vfsflags, char *filteropts)
1716 len_and_sockaddr *lsa;
1722 # if ENABLE_FEATURE_IPV6
1723 end = strchr(mp->mnt_fsname, ']');
1724 if (end && end[1] == ':')
1728 /* mount_main() guarantees that ':' is there */
1729 end = strchr(mp->mnt_fsname, ':');
1732 lsa = xhost2sockaddr(mp->mnt_fsname, /*port:*/ 0);
1734 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1735 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1736 opts = xasprintf("%s%saddr=%s",
1737 filteropts ? filteropts : "",
1738 filteropts ? "," : "",
1741 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1742 ret = mount_it_now(mp, vfsflags, opts);
1743 if (ENABLE_FEATURE_CLEAN_UP) free(opts);
1748 #endif // !ENABLE_FEATURE_MOUNT_NFS
1750 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1751 // type detection. Returns 0 for success, nonzero for failure.
1752 // NB: mp->xxx fields may be trashed on exit
1753 static int singlemount(struct mntent *mp, int ignore_busy)
1756 unsigned long vfsflags;
1757 char *loopFile = NULL, *filteropts = NULL;
1763 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1765 // Treat fstype "auto" as unspecified
1766 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1767 mp->mnt_type = NULL;
1769 // Might this be a virtual filesystem?
1770 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1774 // fsname: "cmd#arg1#arg2..."
1775 // WARNING: allows execution of arbitrary commands!
1776 // Try "mount 'sh#-c#sh' bogus_dir".
1777 // It is safe ONLY because non-root
1778 // cannot use two-argument mount command
1779 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1780 // "mount: can't find sh#-c#sh in /etc/fstab"
1781 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1786 while (*s && n < 35 - 2) {
1787 if (*s++ == '#' && *s != '#') {
1792 args[n++] = mp->mnt_dir;
1794 rc = spawn_and_wait(args);
1798 // Might this be an CIFS filesystem?
1799 if (ENABLE_FEATURE_MOUNT_CIFS
1800 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1801 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1802 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1806 len_and_sockaddr *lsa;
1807 char *hostname, *dotted, *ip;
1809 hostname = mp->mnt_fsname + 2;
1810 len = strcspn(hostname, "/\\");
1811 if (len == 0 || hostname[len] == '\0')
1814 hostname[len] = '\0';
1815 lsa = host2sockaddr(hostname, 0);
1820 // Insert "ip=..." option into options
1821 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1822 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1823 ip = xasprintf("ip=%s", dotted);
1824 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1825 parse_mount_options(ip, &filteropts);
1826 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1828 // "-o mand" is required [why?]
1829 vfsflags |= MS_MANDLOCK;
1830 mp->mnt_type = (char*)"cifs";
1831 rc = mount_it_now(mp, vfsflags, filteropts);
1836 // Might this be an NFS filesystem?
1837 if ((!mp->mnt_type || strncmp(mp->mnt_type, "nfs", 3) == 0)
1838 && strchr(mp->mnt_fsname, ':') != NULL
1841 mp->mnt_type = (char*)"nfs";
1842 rc = nfsmount(mp, vfsflags, filteropts);
1846 // Look at the file. (Not found isn't a failure for remount, or for
1847 // a synthetic filesystem like proc or sysfs.)
1848 // (We use stat, not lstat, in order to allow
1849 // mount symlink_to_file_or_blkdev dir)
1850 if (!stat(mp->mnt_fsname, &st)
1851 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1853 // Do we need to allocate a loopback device for it?
1854 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1855 loopFile = bb_simplify_path(mp->mnt_fsname);
1856 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1857 if (set_loop(&mp->mnt_fsname, loopFile, 0, /*ro:*/ (vfsflags & MS_RDONLY)) < 0) {
1858 if (errno == EPERM || errno == EACCES)
1859 bb_error_msg(bb_msg_perm_denied_are_you_root);
1861 bb_perror_msg("can't setup loop device");
1865 // Autodetect bind mounts
1866 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1867 vfsflags |= MS_BIND;
1870 // If we know the fstype (or don't need to), jump straight
1871 // to the actual mount.
1872 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
1875 next = mp->mnt_type ? strchr(mp->mnt_type, ',') : NULL;
1878 rc = mount_it_now(mp, vfsflags, filteropts);
1879 if (rc == 0 || !next)
1881 mp->mnt_type = next + 1;
1884 // Loop through filesystem types until mount succeeds
1887 // Initialize list of block backed filesystems.
1888 // This has to be done here so that during "mount -a",
1889 // mounts after /proc shows up can autodetect.
1891 fslist = get_block_backed_filesystems();
1892 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1893 atexit(delete_block_backed_filesystems);
1896 for (fl = fslist; fl; fl = fl->link) {
1897 mp->mnt_type = fl->data;
1898 rc = mount_it_now(mp, vfsflags, filteropts);
1904 // If mount failed, clean up loop file (if any).
1905 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1906 del_loop(mp->mnt_fsname);
1907 if (ENABLE_FEATURE_CLEAN_UP) {
1909 free(mp->mnt_fsname);
1914 if (ENABLE_FEATURE_CLEAN_UP)
1917 if (errno == EBUSY && ignore_busy)
1920 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1925 // -O interprets a list of filter options which select whether a mount
1926 // point will be mounted: only mounts with options matching *all* filtering
1927 // options will be selected.
1928 // By default each -O filter option must be present in the list of mount
1929 // options, but if it is prefixed by "no" then it must be absent.
1931 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1932 // (and also fails to match -o a because -o c is absent).
1934 // It is different from -t in that each option is matched exactly; a leading
1935 // "no" at the beginning of one option does not negate the rest.
1936 static int match_opt(const char *fs_opt_in, const char *O_opt)
1942 const char *fs_opt = fs_opt_in;
1946 // If option begins with "no" then treat as an inverted match:
1947 // matching is a failure
1949 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1953 // Isolate the current O option
1954 O_len = strchrnul(O_opt, ',') - O_opt;
1955 // Check for a match against existing options
1957 if (strncmp(fs_opt, O_opt, O_len) == 0
1958 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1961 return 0; // "no" prefix, but option found
1962 match = 1; // current O option found, go check next one
1965 fs_opt = strchr(fs_opt, ',');
1971 return 0; // match wanted but not found
1972 if (O_opt[O_len] == '\0') // end?
1974 // Step to the next O option
1977 // If we get here then everything matched
1981 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1982 // each directory to be mounted.
1983 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1984 int mount_main(int argc UNUSED_PARAM, char **argv)
1986 char *cmdopts = xzalloc(1);
1987 char *fstype = NULL;
1988 char *O_optmatch = NULL;
1990 llist_t *lst_o = NULL;
1991 const char *fstabname;
1994 int rc = EXIT_SUCCESS;
1995 unsigned long cmdopt_flags;
1997 struct mntent mtpair[2], *mtcur = mtpair;
1998 IF_NOT_DESKTOP(const int nonroot = 0;)
2000 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
2004 // Parse long options, like --bind and --move. Note that -o option
2005 // and --option are synonymous. Yes, this means --remount,rw works.
2006 for (i = j = 1; argv[i]; i++) {
2007 if (argv[i][0] == '-' && argv[i][1] == '-')
2008 append_mount_options(&cmdopts, argv[i] + 2);
2010 argv[j++] = argv[i];
2014 // Parse remaining options
2015 // Max 2 params; -o is a list, -v is a counter
2016 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
2017 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
2018 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
2019 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
2020 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
2021 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
2024 // If we have no arguments, show currently mounted filesystems
2026 if (!(opt & OPT_a)) {
2027 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
2030 bb_error_msg_and_die("no %s", bb_path_mtab_file);
2032 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
2035 // Don't show rootfs. FIXME: why??
2036 // util-linux 2.12a happily shows rootfs...
2037 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
2039 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
2040 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
2041 mtpair->mnt_dir, mtpair->mnt_type,
2044 if (ENABLE_FEATURE_CLEAN_UP)
2045 endmntent(mountTable);
2046 return EXIT_SUCCESS;
2048 storage_path = NULL;
2050 // When we have two arguments, the second is the directory and we can
2051 // skip looking at fstab entirely. We can always abspath() the directory
2052 // argument when we get it.
2055 bb_error_msg_and_die(bb_msg_you_must_be_root);
2056 mtpair->mnt_fsname = argv[0];
2057 mtpair->mnt_dir = argv[1];
2058 mtpair->mnt_type = fstype;
2059 mtpair->mnt_opts = cmdopts;
2060 resolve_mount_spec(&mtpair->mnt_fsname);
2061 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
2064 storage_path = bb_simplify_path(argv[0]); // malloced
2067 // Past this point, we are handling either "mount -a [opts]"
2068 // or "mount [opts] single_param"
2070 cmdopt_flags = parse_mount_options(cmdopts, NULL);
2071 if (nonroot && (cmdopt_flags & ~MS_SILENT)) // Non-root users cannot specify flags
2072 bb_error_msg_and_die(bb_msg_you_must_be_root);
2074 // If we have a shared subtree flag, don't worry about fstab or mtab.
2075 if (ENABLE_FEATURE_MOUNT_FLAGS
2076 && (cmdopt_flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2078 // verbose_mount(source, target, type, flags, data)
2079 rc = verbose_mount("", argv[0], "", cmdopt_flags, "");
2081 bb_simple_perror_msg_and_die(argv[0]);
2085 // Open either fstab or mtab
2086 fstabname = "/etc/fstab";
2087 if (cmdopt_flags & MS_REMOUNT) {
2088 // WARNING. I am not sure this matches util-linux's
2089 // behavior. It's possible util-linux does not
2090 // take -o opts from mtab (takes only mount source).
2091 fstabname = bb_path_mtab_file;
2093 fstab = setmntent(fstabname, "r");
2095 bb_perror_msg_and_die("can't read '%s'", fstabname);
2097 // Loop through entries until we find what we're looking for
2098 memset(mtpair, 0, sizeof(mtpair));
2100 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
2102 // Get next fstab entry
2103 if (!getmntent_r(fstab, mtcur, getmntent_buf
2104 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
2105 GETMNTENT_BUFSIZE/2)
2106 ) { // End of fstab/mtab is reached
2107 mtcur = mtother; // the thing we found last time
2111 // If we're trying to mount something specific and this isn't it,
2112 // skip it. Note we must match the exact text in fstab (ala
2113 // "proc") or a full path from root
2116 // Is this what we're looking for?
2117 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
2118 && strcmp(storage_path, mtcur->mnt_fsname) != 0
2119 && strcmp(argv[0], mtcur->mnt_dir) != 0
2120 && strcmp(storage_path, mtcur->mnt_dir) != 0
2125 // Remember this entry. Something later may have
2126 // overmounted it, and we want the _last_ match.
2129 // If we're mounting all
2132 // No, mount -a won't mount anything,
2133 // even user mounts, for mere humans
2135 bb_error_msg_and_die(bb_msg_you_must_be_root);
2137 // Does type match? (NULL matches always)
2138 if (!match_fstype(mtcur, fstype))
2141 // Skip noauto and swap anyway
2142 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
2143 // swap is bogus "fstype", parse_mount_options can't check fstypes
2144 || strcasecmp(mtcur->mnt_type, "swap") == 0
2149 // Does (at least one) option match?
2150 // (NULL matches always)
2151 if (!match_opt(mtcur->mnt_opts, O_optmatch))
2154 resolve_mount_spec(&mtcur->mnt_fsname);
2156 // NFS mounts want this to be xrealloc-able
2157 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2159 // If nothing is mounted on this directory...
2160 // (otherwise repeated "mount -a" mounts everything again)
2161 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2162 // We do not check fsname match of found mount point -
2163 // "/" may have fsname of "/dev/root" while fstab
2164 // says "/dev/something_else".
2167 bb_error_msg("according to %s, "
2168 "%s is already mounted on %s",
2170 mp->mnt_fsname, mp->mnt_dir);
2173 // ...mount this thing
2174 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2175 // Count number of failed mounts
2179 free(mtcur->mnt_opts);
2183 // End of fstab/mtab is reached.
2184 // Were we looking for something specific?
2185 if (argv[0]) { // yes
2188 // If we didn't find anything, complain
2189 if (!mtcur->mnt_fsname)
2190 bb_error_msg_and_die("can't find %s in %s",
2191 argv[0], fstabname);
2193 // What happens when we try to "mount swap_partition"?
2194 // (fstab containts "swap_partition swap swap defaults 0 0")
2195 // util-linux-ng 2.13.1 does this:
2196 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2197 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2198 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2199 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2200 // exit_group(32) = ?
2202 // In case we want to simply skip swap partitions:
2203 l = parse_mount_options(mtcur->mnt_opts, NULL);
2204 if ((l & MOUNT_SWAP)
2205 // swap is bogus "fstype", parse_mount_options can't check fstypes
2206 || strcasecmp(mtcur->mnt_type, "swap") == 0
2212 // fstab must have "users" or "user"
2213 l = parse_mount_options(mtcur->mnt_opts, NULL);
2214 if (!(l & MOUNT_USERS))
2215 bb_error_msg_and_die(bb_msg_you_must_be_root);
2218 //util-linux-2.12 does not do this check.
2219 //// If nothing is mounted on this directory...
2220 //// (otherwise repeated "mount FOO" mounts FOO again)
2221 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2223 // bb_error_msg("according to %s, "
2224 // "%s is already mounted on %s",
2225 // bb_path_mtab_file,
2226 // mp->mnt_fsname, mp->mnt_dir);
2228 // ...mount the last thing we found
2229 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2230 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2231 resolve_mount_spec(&mtpair->mnt_fsname);
2232 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2233 if (ENABLE_FEATURE_CLEAN_UP)
2234 free(mtcur->mnt_opts);
2239 if (ENABLE_FEATURE_CLEAN_UP)
2241 if (ENABLE_FEATURE_CLEAN_UP) {
2246 //TODO: exitcode should be ORed mask of (from "man mount"):
2248 // 1 incorrect invocation or permissions
2249 // 2 system error (out of memory, cannot fork, no more loop devices)
2250 // 4 internal mount bug or missing nfs support in mount
2252 //16 problems writing or locking /etc/mtab
2254 //64 some mount succeeded