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"
25 //usage: "\n -a Mount all filesystems in fstab"
26 //usage: IF_FEATURE_MOUNT_FAKE(
27 //usage: IF_FEATURE_MTAB_SUPPORT(
28 //usage: "\n -f Update /etc/mtab, but don't mount"
30 //usage: IF_NOT_FEATURE_MTAB_SUPPORT(
31 //usage: "\n -f Dry run"
34 //usage: IF_FEATURE_MOUNT_HELPERS(
35 //usage: "\n -i Don't run mount helper"
37 //usage: IF_FEATURE_MTAB_SUPPORT(
38 //usage: "\n -n Don't update /etc/mtab"
40 //usage: "\n -r Read-only mount"
41 //usage: "\n -w Read-write mount (default)"
42 //usage: "\n -t FSTYPE Filesystem type"
43 //usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
45 //usage: IF_FEATURE_MOUNT_LOOP(
46 //usage: "\n loop Ignored (loop devices are autodetected)"
48 //usage: IF_FEATURE_MOUNT_FLAGS(
49 //usage: "\n [a]sync Writes are [a]synchronous"
50 //usage: "\n [no]atime Disable/enable updates to inode access times"
51 //usage: "\n [no]diratime Disable/enable atime updates to directories"
52 //usage: "\n [no]relatime Disable/enable atime updates relative to modification time"
53 //usage: "\n [no]dev (Dis)allow use of special device files"
54 //usage: "\n [no]exec (Dis)allow use of executable files"
55 //usage: "\n [no]suid (Dis)allow set-user-id-root programs"
56 //usage: "\n [r]shared Convert [recursively] to a shared subtree"
57 //usage: "\n [r]slave Convert [recursively] to a slave subtree"
58 //usage: "\n [r]private Convert [recursively] to a private subtree"
59 //usage: "\n [un]bindable Make mount point [un]able to be bind mounted"
60 //usage: "\n [r]bind Bind a file or directory [recursively] to another location"
61 //usage: "\n move Relocate an existing mount point"
63 //usage: "\n remount Remount a mounted filesystem, changing flags"
64 //usage: "\n ro/rw Same as -r/-w"
66 //usage: "\nThere are filesystem-specific -o flags."
68 //usage:#define mount_example_usage
70 //usage: "/dev/hda3 on / type minix (rw)\n"
71 //usage: "proc on /proc type proc (rw)\n"
72 //usage: "devpts on /dev/pts type devpts (rw)\n"
73 //usage: "$ mount /dev/fd0 /mnt -t msdos -o ro\n"
74 //usage: "$ mount /tmp/diskimage /opt -t ext2 -o loop\n"
75 //usage: "$ mount cd_image.iso mydir\n"
76 //usage:#define mount_notes_usage
77 //usage: "Returns 0 for success, number of failed mounts for -a, or errno for one mount."
81 #include <sys/mount.h>
82 // Grab more as needed from util-linux's mount/mount_constants.h
84 # define MS_DIRSYNC (1 << 7) // Directory modifications are synchronous
87 # define MS_UNION (1 << 8)
90 # define MS_BIND (1 << 12)
93 # define MS_MOVE (1 << 13)
96 # define MS_RECURSIVE (1 << 14)
99 # define MS_SILENT (1 << 15)
101 // The shared subtree stuff, which went in around 2.6.15
102 #ifndef MS_UNBINDABLE
103 # define MS_UNBINDABLE (1 << 17)
106 # define MS_PRIVATE (1 << 18)
109 # define MS_SLAVE (1 << 19)
112 # define MS_SHARED (1 << 20)
115 # define MS_RELATIME (1 << 21)
119 #if ENABLE_FEATURE_MOUNT_LABEL
120 # include "volume_id.h"
122 # define resolve_mount_spec(fsname) ((void)0)
125 // Needed for nfs support only
126 #include <sys/utsname.h>
129 #if ENABLE_FEATURE_MOUNT_NFS
130 /* This is just a warning of a common mistake. Possibly this should be a
131 * uclibc faq entry rather than in busybox... */
132 # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
133 # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
135 # include <rpc/rpc.h>
136 # include <rpc/pmap_prot.h>
137 # include <rpc/pmap_clnt.h>
141 #if defined(__dietlibc__)
142 // 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
143 // dietlibc-0.30 does not have implementation of getmntent_r()
144 static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
145 char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM)
147 struct mntent* ment = getmntent(stream);
148 return memcpy(result, ment, sizeof(*ment));
153 // Not real flags, but we want to be able to check for this.
155 MOUNT_USERS = (1 << 28) * ENABLE_DESKTOP,
156 MOUNT_NOAUTO = (1 << 29),
157 MOUNT_SWAP = (1 << 30),
161 #define OPTION_STR "o:t:rwanfvsiO:"
176 #if ENABLE_FEATURE_MTAB_SUPPORT
177 #define USE_MTAB (!(option_mask32 & OPT_n))
182 #if ENABLE_FEATURE_MOUNT_FAKE
183 #define FAKE_IT (option_mask32 & OPT_f)
188 #if ENABLE_FEATURE_MOUNT_HELPERS
189 #define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
191 #define HELPERS_ALLOWED 0
195 // TODO: more "user" flag compatibility.
196 // "user" option (from mount manpage):
197 // Only the user that mounted a filesystem can unmount it again.
198 // If any user should be able to unmount, then use users instead of user
199 // in the fstab line. The owner option is similar to the user option,
200 // with the restriction that the user must be the owner of the special file.
201 // This may be useful e.g. for /dev/fd if a login script makes
202 // the console user owner of this device.
204 // Standard mount options (from -o options or --options),
205 // with corresponding flags
206 static const int32_t mount_options[] = {
207 // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs.
209 IF_FEATURE_MOUNT_LOOP(
213 IF_FEATURE_MOUNT_FSTAB(
215 /* "quiet" 0 - do not filter out, vfat wants to see it */
216 /* "noauto" */ MOUNT_NOAUTO,
217 /* "sw" */ MOUNT_SWAP,
218 /* "swap" */ MOUNT_SWAP,
219 IF_DESKTOP(/* "user" */ MOUNT_USERS,)
220 IF_DESKTOP(/* "users" */ MOUNT_USERS,)
224 IF_FEATURE_MOUNT_FLAGS(
226 /* "nosuid" */ MS_NOSUID,
227 /* "suid" */ ~MS_NOSUID,
228 /* "dev" */ ~MS_NODEV,
229 /* "nodev" */ MS_NODEV,
230 /* "exec" */ ~MS_NOEXEC,
231 /* "noexec" */ MS_NOEXEC,
232 /* "sync" */ MS_SYNCHRONOUS,
233 /* "dirsync" */ MS_DIRSYNC,
234 /* "async" */ ~MS_SYNCHRONOUS,
235 /* "atime" */ ~MS_NOATIME,
236 /* "noatime" */ MS_NOATIME,
237 /* "diratime" */ ~MS_NODIRATIME,
238 /* "nodiratime" */ MS_NODIRATIME,
239 /* "mand" */ MS_MANDLOCK,
240 /* "nomand" */ ~MS_MANDLOCK,
241 /* "relatime" */ MS_RELATIME,
242 /* "norelatime" */ ~MS_RELATIME,
243 /* "loud" */ ~MS_SILENT,
244 /* "rbind" */ MS_BIND|MS_RECURSIVE,
247 /* "union" */ MS_UNION,
248 /* "bind" */ MS_BIND,
249 /* "move" */ MS_MOVE,
250 /* "shared" */ MS_SHARED,
251 /* "slave" */ MS_SLAVE,
252 /* "private" */ MS_PRIVATE,
253 /* "unbindable" */ MS_UNBINDABLE,
254 /* "rshared" */ MS_SHARED|MS_RECURSIVE,
255 /* "rslave" */ MS_SLAVE|MS_RECURSIVE,
256 /* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
257 /* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
260 // Always understood.
261 /* "ro" */ MS_RDONLY, // vfs flag
262 /* "rw" */ ~MS_RDONLY, // vfs flag
263 /* "remount" */ MS_REMOUNT // action flag
266 static const char mount_option_str[] =
267 IF_FEATURE_MOUNT_LOOP(
270 IF_FEATURE_MOUNT_FSTAB(
272 // "quiet\0" - do not filter out, vfat wants to see it
277 IF_DESKTOP("users\0")
280 IF_FEATURE_MOUNT_FLAGS(
316 // Always understood.
319 "remount\0" // action flag
324 #if ENABLE_FEATURE_MOUNT_NFS
325 smalluint nfs_mount_version;
327 #if ENABLE_FEATURE_MOUNT_VERBOSE
331 char getmntent_buf[1];
333 enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_buf) };
334 #define G (*(struct globals*)&bb_common_bufsiz1)
335 #define nfs_mount_version (G.nfs_mount_version)
336 #if ENABLE_FEATURE_MOUNT_VERBOSE
337 #define verbose (G.verbose )
341 #define fslist (G.fslist )
342 #define getmntent_buf (G.getmntent_buf )
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 long parse_mount_options(char *options, char **unrecognized)
455 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 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));
533 if (ENABLE_FEATURE_CLEAN_UP) fclose(f);
539 #if ENABLE_FEATURE_CLEAN_UP
540 static void delete_block_backed_filesystems(void)
542 llist_free(fslist, free);
545 void delete_block_backed_filesystems(void);
548 // Perform actual mount of specific filesystem at specific location.
549 // NB: mp->xxx fields may be trashed on exit
550 static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
556 bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
557 mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
558 vfsflags, filteropts);
562 // Mount, with fallback to read-only if necessary.
565 rc = verbose_mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
566 vfsflags, filteropts);
568 // If mount failed, try
569 // helper program mount.<mnt_type>
570 if (HELPERS_ALLOWED && rc && mp->mnt_type) {
572 int errno_save = errno;
573 args[0] = xasprintf("mount.%s", mp->mnt_type);
576 args[rc++] = (char *)"-f";
577 if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
578 args[rc++] = (char *)"-n";
579 args[rc++] = mp->mnt_fsname;
580 args[rc++] = mp->mnt_dir;
582 args[rc++] = (char *)"-o";
583 args[rc++] = filteropts;
586 rc = spawn_and_wait(args);
593 if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
595 if (!(vfsflags & MS_SILENT))
596 bb_error_msg("%s is write-protected, mounting read-only",
598 vfsflags |= MS_RDONLY;
601 // Abort entirely if permission denied.
603 if (rc && errno == EPERM)
604 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
606 // If the mount was successful, and we're maintaining an old-style
607 // mtab file by hand, add the new entry to it now.
609 if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
611 FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
612 const char *option_str = mount_option_str;
616 bb_perror_msg(bb_path_mtab_file);
620 // Add vfs string flags
621 for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
622 if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
623 append_mount_options(&(mp->mnt_opts), option_str);
624 option_str += strlen(option_str) + 1;
627 // Remove trailing / (if any) from directory we mounted on
628 i = strlen(mp->mnt_dir) - 1;
629 while (i > 0 && mp->mnt_dir[i] == '/')
630 mp->mnt_dir[i--] = '\0';
632 // Convert to canonical pathnames as needed
633 mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
635 if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
636 mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
637 mp->mnt_type = (char*)"bind";
639 mp->mnt_freq = mp->mnt_passno = 0;
642 #if ENABLE_FEATURE_MTAB_SUPPORT
643 if (vfsflags & MS_MOVE)
644 update_mtab_entry_on_move(mp);
647 addmntent(mountTable, mp);
648 endmntent(mountTable);
650 if (ENABLE_FEATURE_CLEAN_UP) {
659 #if ENABLE_FEATURE_MOUNT_NFS
663 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
665 * Licensed under GPLv2, see file LICENSE in this source tree.
667 * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
668 * numbers to be specified on the command line.
670 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
671 * Omit the call to connect() for Linux version 1.3.11 or later.
673 * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
674 * Implemented the "bg", "fg" and "retry" mount options for NFS.
676 * 1999-02-22 Arkadiusz Mickiewicz <misiek@misiek.eu.org>
677 * - added Native Language Support
679 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
683 #define MOUNTPORT 635
684 #define MNTPATHLEN 1024
685 #define MNTNAMLEN 255
689 typedef char fhandle[FHSIZE];
692 unsigned int fhandle3_len;
704 MNT3ERR_NAMETOOLONG = 63,
705 MNT3ERR_NOTSUPP = 10004,
706 MNT3ERR_SERVERFAULT = 10006,
708 typedef enum mountstat3 mountstat3;
711 unsigned int fhs_status;
716 typedef struct fhstatus fhstatus;
718 struct mountres3_ok {
721 unsigned int auth_flavours_len;
722 char *auth_flavours_val;
725 typedef struct mountres3_ok mountres3_ok;
728 mountstat3 fhs_status;
730 mountres3_ok mountinfo;
733 typedef struct mountres3 mountres3;
735 typedef char *dirpath;
739 typedef struct mountbody *mountlist;
743 dirpath ml_directory;
746 typedef struct mountbody mountbody;
748 typedef struct groupnode *groups;
754 typedef struct groupnode groupnode;
756 typedef struct exportnode *exports;
763 typedef struct exportnode exportnode;
776 typedef struct ppathcnf ppathcnf;
778 #define MOUNTPROG 100005
781 #define MOUNTPROC_NULL 0
782 #define MOUNTPROC_MNT 1
783 #define MOUNTPROC_DUMP 2
784 #define MOUNTPROC_UMNT 3
785 #define MOUNTPROC_UMNTALL 4
786 #define MOUNTPROC_EXPORT 5
787 #define MOUNTPROC_EXPORTALL 6
789 #define MOUNTVERS_POSIX 2
791 #define MOUNTPROC_PATHCONF 7
795 #define MOUNTPROC3_NULL 0
796 #define MOUNTPROC3_MNT 1
797 #define MOUNTPROC3_DUMP 2
798 #define MOUNTPROC3_UMNT 3
799 #define MOUNTPROC3_UMNTALL 4
800 #define MOUNTPROC3_EXPORT 5
812 * We want to be able to compile mount on old kernels in such a way
813 * that the binary will work well on more recent kernels.
814 * Thus, if necessary we teach nfsmount.c the structure of new fields
815 * that will come later.
817 * Moreover, the new kernel includes conflict with glibc includes
818 * so it is easiest to ignore the kernel altogether (at compile time).
826 unsigned char data[64];
829 struct nfs_mount_data {
832 struct nfs2_fh old_root; /* 1 */
838 int acregmin; /* 1 */
839 int acregmax; /* 1 */
840 int acdirmin; /* 1 */
841 int acdirmax; /* 1 */
842 struct sockaddr_in addr; /* 1 */
843 char hostname[256]; /* 1 */
845 unsigned int bsize; /* 3 */
846 struct nfs3_fh root; /* 4 */
849 /* bits in the flags field */
851 NFS_MOUNT_SOFT = 0x0001, /* 1 */
852 NFS_MOUNT_INTR = 0x0002, /* 1 */
853 NFS_MOUNT_SECURE = 0x0004, /* 1 */
854 NFS_MOUNT_POSIX = 0x0008, /* 1 */
855 NFS_MOUNT_NOCTO = 0x0010, /* 1 */
856 NFS_MOUNT_NOAC = 0x0020, /* 1 */
857 NFS_MOUNT_TCP = 0x0040, /* 2 */
858 NFS_MOUNT_VER3 = 0x0080, /* 3 */
859 NFS_MOUNT_KERBEROS = 0x0100, /* 3 */
860 NFS_MOUNT_NONLM = 0x0200, /* 3 */
861 NFS_MOUNT_NORDIRPLUS = 0x4000
866 * We need to translate between nfs status return values and
867 * the local errno values which may not be the same.
869 * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
870 * "after #include <errno.h> the symbol errno is reserved for any use,
871 * it cannot even be used as a struct tag or field name".
874 # define EDQUOT ENOSPC
876 /* Convert each NFSERR_BLAH into EBLAH */
877 static const uint8_t nfs_err_stat[] = {
879 19, 20, 21, 22, 27, 28,
880 30, 63, 66, 69, 70, 71
883 EPERM | ENOENT | EIO | ENXIO | EACCES| EEXIST | \
884 ENODEV| ENOTDIR | EISDIR | EINVAL| EFBIG | ENOSPC | \
885 EROFS | ENAMETOOLONG| ENOTEMPTY| EDQUOT| ESTALE| EREMOTE) < 256
886 typedef uint8_t nfs_err_type;
888 typedef uint16_t nfs_err_type;
890 static const nfs_err_type nfs_err_errnum[] = {
891 EPERM , ENOENT , EIO , ENXIO , EACCES, EEXIST,
892 ENODEV, ENOTDIR , EISDIR , EINVAL, EFBIG , ENOSPC,
893 EROFS , ENAMETOOLONG, ENOTEMPTY, EDQUOT, ESTALE, EREMOTE
895 static char *nfs_strerror(int status)
899 for (i = 0; i < ARRAY_SIZE(nfs_err_stat); i++) {
900 if (nfs_err_stat[i] == status)
901 return strerror(nfs_err_errnum[i]);
903 return xasprintf("unknown nfs status return value: %d", status);
906 static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
908 return xdr_opaque(xdrs, objp, FHSIZE);
911 static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
913 if (!xdr_u_int(xdrs, &objp->fhs_status))
915 if (objp->fhs_status == 0)
916 return xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle);
920 static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
922 return xdr_string(xdrs, objp, MNTPATHLEN);
925 static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
927 return xdr_bytes(xdrs, (char **)&objp->fhandle3_val,
928 (unsigned int *) &objp->fhandle3_len,
932 static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
934 if (!xdr_fhandle3(xdrs, &objp->fhandle))
936 return xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val),
937 &(objp->auth_flavours.auth_flavours_len),
940 (xdrproc_t) xdr_int);
943 static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
945 return xdr_enum(xdrs, (enum_t *) objp);
948 static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
950 if (!xdr_mountstat3(xdrs, &objp->fhs_status))
952 if (objp->fhs_status == MNT_OK)
953 return xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo);
957 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
960 * Unfortunately, the kernel prints annoying console messages
961 * in case of an unexpected nfs mount version (instead of
962 * just returning some error). Therefore we'll have to try
963 * and figure out what version the kernel expects.
966 * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
967 * NFS_MOUNT_VERSION: these nfsmount sources at compile time
968 * nfs_mount_version: version this source and running kernel can handle
971 find_kernel_nfs_mount_version(void)
975 if (nfs_mount_version)
978 nfs_mount_version = 4; /* default */
980 kernel_version = get_linux_version_code();
981 if (kernel_version) {
982 if (kernel_version < KERNEL_VERSION(2,2,18))
983 nfs_mount_version = 3;
984 /* else v4 since 2.3.99pre4 */
989 get_mountport(struct pmap *pm_mnt,
990 struct sockaddr_in *server_addr,
992 long unsigned version,
996 struct pmaplist *pmap;
998 server_addr->sin_port = PMAPPORT;
999 /* glibc 2.4 (still) has pmap_getmaps(struct sockaddr_in *).
1000 * I understand it like "IPv6 for this is not 100% ready" */
1001 pmap = pmap_getmaps(server_addr);
1003 if (version > MAX_NFSPROT)
1004 version = MAX_NFSPROT;
1007 pm_mnt->pm_prog = prog;
1008 pm_mnt->pm_vers = version;
1009 pm_mnt->pm_prot = proto;
1010 pm_mnt->pm_port = port;
1013 if (pmap->pml_map.pm_prog != prog)
1015 if (!version && pm_mnt->pm_vers > pmap->pml_map.pm_vers)
1017 if (version > 2 && pmap->pml_map.pm_vers != version)
1019 if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
1021 if (pmap->pml_map.pm_vers > MAX_NFSPROT
1022 || (proto && pm_mnt->pm_prot && pmap->pml_map.pm_prot != proto)
1023 || (port && pmap->pml_map.pm_port != port)
1027 memcpy(pm_mnt, &pmap->pml_map, sizeof(*pm_mnt));
1029 pmap = pmap->pml_next;
1031 if (!pm_mnt->pm_vers)
1032 pm_mnt->pm_vers = MOUNTVERS;
1033 if (!pm_mnt->pm_port)
1034 pm_mnt->pm_port = MOUNTPORT;
1035 if (!pm_mnt->pm_prot)
1036 pm_mnt->pm_prot = IPPROTO_TCP;
1040 static int daemonize(void)
1043 if (pid < 0) /* error */
1045 if (pid > 0) /* parent */
1049 xopen(bb_dev_null, O_RDWR);
1053 openlog(applet_name, LOG_PID, LOG_DAEMON);
1054 logmode = LOGMODE_SYSLOG;
1058 static inline int daemonize(void) { return -ENOSYS; }
1062 static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM)
1067 /* RPC strerror analogs are terminally idiotic:
1068 * *mandatory* prefix and \n at end.
1069 * This hopefully helps. Usage:
1070 * error_msg_rpc(clnt_*error*(" ")) */
1071 static void error_msg_rpc(const char *msg)
1074 while (msg[0] == ' ' || msg[0] == ':') msg++;
1076 while (len && msg[len-1] == '\n') len--;
1077 bb_error_msg("%.*s", len, msg);
1080 /* NB: mp->xxx fields may be trashed on exit */
1081 static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
1087 /* prior to 2.6.23, kernel took NFS options in a form of this struct
1088 * only. 2.6.23+ looks at data->version, and if it's not 1..6,
1089 * then data pointer is interpreted as a string. */
1090 struct nfs_mount_data data;
1093 struct sockaddr_in server_addr;
1094 struct sockaddr_in mount_server_addr;
1097 struct fhstatus nfsv2;
1098 struct mountres3 nfsv3;
1116 /* these all are one-bit really. gcc 4.3.1 likes this combination: */
1126 find_kernel_nfs_mount_version();
1134 /* NB: hostname, mounthost, filteropts must be free()d prior to return */
1136 filteropts = xstrdup(filteropts); /* going to trash it later... */
1138 hostname = xstrdup(mp->mnt_fsname);
1139 /* mount_main() guarantees that ':' is there */
1140 s = strchr(hostname, ':');
1143 /* Ignore all but first hostname in replicated mounts
1144 until they can be fully supported. (mack@sgi.com) */
1145 s = strchr(hostname, ',');
1148 bb_error_msg("warning: multiple hostnames not supported");
1151 server_addr.sin_family = AF_INET;
1152 if (!inet_aton(hostname, &server_addr.sin_addr)) {
1153 hp = gethostbyname(hostname);
1155 bb_herror_msg("%s", hostname);
1158 if (hp->h_length != (int)sizeof(struct in_addr)) {
1159 bb_error_msg_and_die("only IPv4 is supported");
1161 memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1164 memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
1166 /* add IP address to mtab options for use when unmounting */
1168 if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
1169 mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
1171 char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
1172 mp->mnt_opts[0] ? "," : "",
1173 inet_ntoa(server_addr.sin_addr));
1178 /* Set default options.
1179 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
1180 * let the kernel decide.
1181 * timeo is filled in after we know whether it'll be TCP or UDP. */
1182 memset(&data, 0, sizeof(data));
1188 data.namlen = NAME_MAX;
1197 retry = 10000; /* 10000 minutes ~ 1 week */
1198 tcp = 1; /* nfs-utils uses tcp per default */
1200 mountprog = MOUNTPROG;
1208 if (filteropts) for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
1209 char *opteq = strchr(opt, '=');
1212 static const char options[] ALIGN1 =
1217 /* 4 */ "acregmin\0"
1218 /* 5 */ "acregmax\0"
1219 /* 6 */ "acdirmin\0"
1220 /* 7 */ "acdirmax\0"
1224 /* 11 */ "mountport\0"
1225 /* 12 */ "mounthost\0"
1226 /* 13 */ "mountprog\0"
1227 /* 14 */ "mountvers\0"
1228 /* 15 */ "nfsprog\0"
1229 /* 16 */ "nfsvers\0"
1236 idx = index_in_strings(options, opt);
1238 case 12: // "mounthost"
1239 mounthost = xstrndup(opteq,
1240 strcspn(opteq, " \t\n\r,"));
1243 if (!strncmp(opteq, "tcp", 3))
1245 else if (!strncmp(opteq, "udp", 3))
1248 bb_error_msg("warning: unrecognized proto= option");
1250 case 20: // "addr" - ignore
1253 if (vfsflags & MS_REMOUNT)
1257 val = xatoi_positive(opteq);
1268 case 3: // "retrans"
1271 case 4: // "acregmin"
1272 data.acregmin = val;
1274 case 5: // "acregmax"
1275 data.acregmax = val;
1277 case 6: // "acdirmin"
1278 data.acdirmin = val;
1280 case 7: // "acdirmax"
1281 data.acdirmax = val;
1283 case 8: // "actimeo"
1284 data.acregmin = val;
1285 data.acregmax = val;
1286 data.acdirmin = val;
1287 data.acdirmax = val;
1295 case 11: // "mountport"
1298 case 13: // "mountprog"
1301 case 14: // "mountvers"
1304 case 15: // "nfsprog"
1307 case 16: // "nfsvers"
1311 case 19: // "namlen"
1312 //if (nfs_mount_version >= 2)
1315 // bb_error_msg("warning: option namlen is not supported\n");
1318 bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
1322 else { /* not of the form opt=val */
1323 static const char options[] ALIGN1 =
1337 if (!strncmp(opt, "no", 2)) {
1341 switch (index_in_strings(options, opt)) {
1377 if (nfs_mount_version >= 3)
1380 bb_error_msg("warning: option nolock is not supported");
1386 bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
1391 proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
1393 data.flags = (soft ? NFS_MOUNT_SOFT : 0)
1394 | (intr ? NFS_MOUNT_INTR : 0)
1395 | (posix ? NFS_MOUNT_POSIX : 0)
1396 | (nocto ? NFS_MOUNT_NOCTO : 0)
1397 | (noac ? NFS_MOUNT_NOAC : 0)
1398 | (nordirplus ? NFS_MOUNT_NORDIRPLUS : 0);
1399 if (nfs_mount_version >= 2)
1400 data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
1401 if (nfs_mount_version >= 3)
1402 data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
1403 if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
1404 bb_error_msg("NFSv%d not supported", nfsvers);
1407 if (nfsvers && !mountvers)
1408 mountvers = (nfsvers < 3) ? 1 : nfsvers;
1409 if (nfsvers && nfsvers < mountvers) {
1410 mountvers = nfsvers;
1413 /* Adjust options if none specified */
1415 data.timeo = tcp ? 70 : 7;
1417 data.version = nfs_mount_version;
1419 if (vfsflags & MS_REMOUNT)
1423 * If the previous mount operation on the same host was
1424 * backgrounded, and the "bg" for this mount is also set,
1425 * give up immediately, to avoid the initial timeout.
1427 if (bg && we_saw_this_host_before(hostname)) {
1428 daemonized = daemonize();
1429 if (daemonized <= 0) { /* parent or error */
1430 retval = -daemonized;
1435 /* Create mount daemon client */
1436 /* See if the nfs host = mount host. */
1438 if (mounthost[0] >= '0' && mounthost[0] <= '9') {
1439 mount_server_addr.sin_family = AF_INET;
1440 mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
1442 hp = gethostbyname(mounthost);
1444 bb_herror_msg("%s", mounthost);
1447 if (hp->h_length != (int)sizeof(struct in_addr)) {
1448 bb_error_msg_and_die("only IPv4 is supported");
1450 mount_server_addr.sin_family = AF_INET;
1451 memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
1456 * The following loop implements the mount retries. When the mount
1457 * times out, and the "bg" option is set, we background ourself
1458 * and continue trying.
1460 * The case where the mount point is not present and the "bg"
1461 * option is set, is treated as a timeout. This is done to
1462 * support nested mounts.
1464 * The "retry" count specified by the user is the number of
1465 * minutes to retry before giving up.
1468 struct timeval total_timeout;
1469 struct timeval retry_timeout;
1475 retry_timeout.tv_sec = 3;
1476 retry_timeout.tv_usec = 0;
1477 total_timeout.tv_sec = 20;
1478 total_timeout.tv_usec = 0;
1479 /* FIXME: use monotonic()? */
1480 timeout = time(NULL) + 60 * retry;
1484 /* Be careful not to use too many CPU cycles */
1488 get_mountport(&pm_mnt, &mount_server_addr,
1493 nfsvers = (pm_mnt.pm_vers < 2) ? 2 : pm_mnt.pm_vers;
1495 /* contact the mount daemon via TCP */
1496 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1497 msock = RPC_ANYSOCK;
1499 switch (pm_mnt.pm_prot) {
1501 mclient = clntudp_create(&mount_server_addr,
1508 mount_server_addr.sin_port = htons(pm_mnt.pm_port);
1509 msock = RPC_ANYSOCK;
1511 mclient = clnttcp_create(&mount_server_addr,
1520 if (!daemonized && prevt == 0)
1521 error_msg_rpc(clnt_spcreateerror(" "));
1523 enum clnt_stat clnt_stat;
1525 /* Try to mount hostname:pathname */
1526 mclient->cl_auth = authunix_create_default();
1528 /* Make pointers in xdr_mountres3 NULL so
1529 * that xdr_array allocates memory for us
1531 memset(&status, 0, sizeof(status));
1533 if (pm_mnt.pm_vers == 3)
1534 clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
1535 (xdrproc_t) xdr_dirpath,
1536 (caddr_t) &pathname,
1537 (xdrproc_t) xdr_mountres3,
1541 clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
1542 (xdrproc_t) xdr_dirpath,
1543 (caddr_t) &pathname,
1544 (xdrproc_t) xdr_fhstatus,
1548 if (clnt_stat == RPC_SUCCESS)
1549 goto prepare_kernel_data; /* we're done */
1550 if (errno != ECONNREFUSED) {
1551 error_msg_rpc(clnt_sperror(mclient, " "));
1552 goto fail; /* don't retry */
1554 /* Connection refused */
1555 if (!daemonized && prevt == 0) /* print just once */
1556 error_msg_rpc(clnt_sperror(mclient, " "));
1557 auth_destroy(mclient->cl_auth);
1558 clnt_destroy(mclient);
1564 /* Timeout. We are going to retry... maybe */
1568 daemonized = daemonize();
1569 if (daemonized <= 0) { /* parent or error */
1570 retval = -daemonized;
1577 /* TODO error message */
1583 prepare_kernel_data:
1586 if (status.nfsv2.fhs_status != 0) {
1587 bb_error_msg("%s:%s failed, reason given by server: %s",
1589 nfs_strerror(status.nfsv2.fhs_status));
1592 memcpy(data.root.data,
1593 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1595 data.root.size = NFS_FHSIZE;
1596 memcpy(data.old_root.data,
1597 (char *) status.nfsv2.fhstatus_u.fhs_fhandle,
1600 fhandle3 *my_fhandle;
1601 if (status.nfsv3.fhs_status != 0) {
1602 bb_error_msg("%s:%s failed, reason given by server: %s",
1604 nfs_strerror(status.nfsv3.fhs_status));
1607 my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
1608 memset(data.old_root.data, 0, NFS_FHSIZE);
1609 memset(&data.root, 0, sizeof(data.root));
1610 data.root.size = my_fhandle->fhandle3_len;
1611 memcpy(data.root.data,
1612 (char *) my_fhandle->fhandle3_val,
1613 my_fhandle->fhandle3_len);
1615 data.flags |= NFS_MOUNT_VER3;
1618 /* Create nfs socket for kernel */
1620 if (nfs_mount_version < 3) {
1621 bb_error_msg("NFS over TCP is not supported");
1624 fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1626 fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
1628 bb_perror_msg("nfs socket");
1631 if (bindresvport(fsock, 0) < 0) {
1632 bb_perror_msg("nfs bindresvport");
1636 server_addr.sin_port = PMAPPORT;
1637 port = pmap_getport(&server_addr, nfsprog, nfsvers,
1638 tcp ? IPPROTO_TCP : IPPROTO_UDP);
1642 server_addr.sin_port = htons(port);
1644 /* Prepare data structure for kernel */
1646 memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
1647 strncpy(data.hostname, hostname, sizeof(data.hostname));
1650 auth_destroy(mclient->cl_auth);
1651 clnt_destroy(mclient);
1656 /* We must wait until mount directory is available */
1657 struct stat statbuf;
1659 while (stat(mp->mnt_dir, &statbuf) == -1) {
1661 daemonized = daemonize();
1662 if (daemonized <= 0) { /* parent or error */
1663 /* FIXME: parent doesn't close fsock - ??! */
1664 retval = -daemonized;
1668 sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */
1675 /* Perform actual mount */
1677 mp->mnt_type = (char*)"nfs";
1678 retval = mount_it_now(mp, vfsflags, (char*)&data);
1685 auth_destroy(mclient->cl_auth);
1686 clnt_destroy(mclient);
1700 #else // !ENABLE_FEATURE_MOUNT_NFS
1702 // Never called. Call should be optimized out.
1703 int nfsmount(struct mntent *mp, long vfsflags, char *filteropts);
1705 #endif // !ENABLE_FEATURE_MOUNT_NFS
1707 // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
1708 // type detection. Returns 0 for success, nonzero for failure.
1709 // NB: mp->xxx fields may be trashed on exit
1710 static int singlemount(struct mntent *mp, int ignore_busy)
1714 char *loopFile = NULL, *filteropts = NULL;
1720 vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
1722 // Treat fstype "auto" as unspecified
1723 if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0)
1724 mp->mnt_type = NULL;
1726 // Might this be a virtual filesystem?
1727 if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
1731 // fsname: "cmd#arg1#arg2..."
1732 // WARNING: allows execution of arbitrary commands!
1733 // Try "mount 'sh#-c#sh' bogus_dir".
1734 // It is safe ONLY because non-root
1735 // cannot use two-argument mount command
1736 // and using one-argument "mount 'sh#-c#sh'" doesn't work:
1737 // "mount: can't find sh#-c#sh in /etc/fstab"
1738 // (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
1743 while (*s && n < 35 - 2) {
1744 if (*s++ == '#' && *s != '#') {
1749 args[n++] = mp->mnt_dir;
1751 rc = spawn_and_wait(args);
1755 // Might this be an CIFS filesystem?
1756 if (ENABLE_FEATURE_MOUNT_CIFS
1757 && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0)
1758 && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\')
1759 && mp->mnt_fsname[0] == mp->mnt_fsname[1]
1763 len_and_sockaddr *lsa;
1764 char *hostname, *dotted, *ip;
1766 hostname = mp->mnt_fsname + 2;
1767 len = strcspn(hostname, "/\\");
1768 if (len == 0 || hostname[len] == '\0')
1771 hostname[len] = '\0';
1772 lsa = host2sockaddr(hostname, 0);
1777 // Insert "ip=..." option into options
1778 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
1779 if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
1780 ip = xasprintf("ip=%s", dotted);
1781 if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
1782 parse_mount_options(ip, &filteropts);
1783 if (ENABLE_FEATURE_CLEAN_UP) free(ip);
1785 // "-o mand" is required [why?]
1786 vfsflags |= MS_MANDLOCK;
1787 mp->mnt_type = (char*)"cifs";
1788 rc = mount_it_now(mp, vfsflags, filteropts);
1793 // Might this be an NFS filesystem?
1794 if (ENABLE_FEATURE_MOUNT_NFS
1795 && (!mp->mnt_type || strcmp(mp->mnt_type, "nfs") == 0)
1796 && strchr(mp->mnt_fsname, ':') != NULL
1798 rc = nfsmount(mp, vfsflags, filteropts);
1802 // Look at the file. (Not found isn't a failure for remount, or for
1803 // a synthetic filesystem like proc or sysfs.)
1804 // (We use stat, not lstat, in order to allow
1805 // mount symlink_to_file_or_blkdev dir)
1806 if (!stat(mp->mnt_fsname, &st)
1807 && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
1809 // Do we need to allocate a loopback device for it?
1810 if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
1811 loopFile = bb_simplify_path(mp->mnt_fsname);
1812 mp->mnt_fsname = NULL; // will receive malloced loop dev name
1813 if (set_loop(&mp->mnt_fsname, loopFile, 0) < 0) {
1814 if (errno == EPERM || errno == EACCES)
1815 bb_error_msg(bb_msg_perm_denied_are_you_root);
1817 bb_perror_msg("can't setup loop device");
1821 // Autodetect bind mounts
1822 } else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
1823 vfsflags |= MS_BIND;
1826 // If we know the fstype (or don't need to), jump straight
1827 // to the actual mount.
1828 if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
1829 rc = mount_it_now(mp, vfsflags, filteropts);
1831 // Loop through filesystem types until mount succeeds
1834 // Initialize list of block backed filesystems.
1835 // This has to be done here so that during "mount -a",
1836 // mounts after /proc shows up can autodetect.
1838 fslist = get_block_backed_filesystems();
1839 if (ENABLE_FEATURE_CLEAN_UP && fslist)
1840 atexit(delete_block_backed_filesystems);
1843 for (fl = fslist; fl; fl = fl->link) {
1844 mp->mnt_type = fl->data;
1845 rc = mount_it_now(mp, vfsflags, filteropts);
1851 // If mount failed, clean up loop file (if any).
1852 if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
1853 del_loop(mp->mnt_fsname);
1854 if (ENABLE_FEATURE_CLEAN_UP) {
1856 free(mp->mnt_fsname);
1861 if (ENABLE_FEATURE_CLEAN_UP)
1864 if (errno == EBUSY && ignore_busy)
1867 bb_perror_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
1872 // -O interprets a list of filter options which select whether a mount
1873 // point will be mounted: only mounts with options matching *all* filtering
1874 // options will be selected.
1875 // By default each -O filter option must be present in the list of mount
1876 // options, but if it is prefixed by "no" then it must be absent.
1878 // -O a,nob,c matches -o a,c but fails to match -o a,b,c
1879 // (and also fails to match -o a because -o c is absent).
1881 // It is different from -t in that each option is matched exactly; a leading
1882 // "no" at the beginning of one option does not negate the rest.
1883 static int match_opt(const char *fs_opt_in, const char *O_opt)
1889 const char *fs_opt = fs_opt_in;
1893 // If option begins with "no" then treat as an inverted match:
1894 // matching is a failure
1896 if (O_opt[0] == 'n' && O_opt[1] == 'o') {
1900 // Isolate the current O option
1901 O_len = strchrnul(O_opt, ',') - O_opt;
1902 // Check for a match against existing options
1904 if (strncmp(fs_opt, O_opt, O_len) == 0
1905 && (fs_opt[O_len] == '\0' || fs_opt[O_len] == ',')
1908 return 0; // "no" prefix, but option found
1909 match = 1; // current O option found, go check next one
1912 fs_opt = strchr(fs_opt, ',');
1918 return 0; // match wanted but not found
1919 if (O_opt[O_len] == '\0') // end?
1921 // Step to the next O option
1924 // If we get here then everything matched
1928 // Parse options, if necessary parse fstab/mtab, and call singlemount for
1929 // each directory to be mounted.
1930 int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1931 int mount_main(int argc UNUSED_PARAM, char **argv)
1933 char *cmdopts = xzalloc(1);
1934 char *fstype = NULL;
1935 char *O_optmatch = NULL;
1937 llist_t *lst_o = NULL;
1938 const char *fstabname;
1941 int rc = EXIT_SUCCESS;
1943 struct mntent mtpair[2], *mtcur = mtpair;
1944 IF_NOT_DESKTOP(const int nonroot = 0;)
1946 IF_DESKTOP(int nonroot = ) sanitize_env_if_suid();
1948 // Parse long options, like --bind and --move. Note that -o option
1949 // and --option are synonymous. Yes, this means --remount,rw works.
1950 for (i = j = 1; argv[i]; i++) {
1951 if (argv[i][0] == '-' && argv[i][1] == '-')
1952 append_mount_options(&cmdopts, argv[i] + 2);
1954 argv[j++] = argv[i];
1958 // Parse remaining options
1959 // Max 2 params; -o is a list, -v is a counter
1960 opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
1961 opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
1962 IF_FEATURE_MOUNT_VERBOSE(, &verbose));
1963 while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
1964 if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
1965 if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
1968 // If we have no arguments, show currently mounted filesystems
1970 if (!(opt & OPT_a)) {
1971 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
1974 bb_error_msg_and_die("no %s", bb_path_mtab_file);
1976 while (getmntent_r(mountTable, &mtpair[0], getmntent_buf,
1979 // Don't show rootfs. FIXME: why??
1980 // util-linux 2.12a happily shows rootfs...
1981 //if (strcmp(mtpair->mnt_fsname, "rootfs") == 0) continue;
1983 if (!fstype || strcmp(mtpair->mnt_type, fstype) == 0)
1984 printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname,
1985 mtpair->mnt_dir, mtpair->mnt_type,
1988 if (ENABLE_FEATURE_CLEAN_UP)
1989 endmntent(mountTable);
1990 return EXIT_SUCCESS;
1992 storage_path = NULL;
1994 // When we have two arguments, the second is the directory and we can
1995 // skip looking at fstab entirely. We can always abspath() the directory
1996 // argument when we get it.
1999 bb_error_msg_and_die(bb_msg_you_must_be_root);
2000 mtpair->mnt_fsname = argv[0];
2001 mtpair->mnt_dir = argv[1];
2002 mtpair->mnt_type = fstype;
2003 mtpair->mnt_opts = cmdopts;
2004 resolve_mount_spec(&mtpair->mnt_fsname);
2005 rc = singlemount(mtpair, /*ignore_busy:*/ 0);
2008 storage_path = bb_simplify_path(argv[0]); // malloced
2011 // Past this point, we are handling either "mount -a [opts]"
2012 // or "mount [opts] single_param"
2014 i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
2015 if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
2016 bb_error_msg_and_die(bb_msg_you_must_be_root);
2018 // If we have a shared subtree flag, don't worry about fstab or mtab.
2019 if (ENABLE_FEATURE_MOUNT_FLAGS
2020 && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2022 // verbose_mount(source, target, type, flags, data)
2023 rc = verbose_mount("", argv[0], "", i, "");
2025 bb_simple_perror_msg_and_die(argv[0]);
2029 // Open either fstab or mtab
2030 fstabname = "/etc/fstab";
2031 if (i & MS_REMOUNT) {
2032 // WARNING. I am not sure this matches util-linux's
2033 // behavior. It's possible util-linux does not
2034 // take -o opts from mtab (takes only mount source).
2035 fstabname = bb_path_mtab_file;
2037 fstab = setmntent(fstabname, "r");
2039 bb_perror_msg_and_die("can't read '%s'", fstabname);
2041 // Loop through entries until we find what we're looking for
2042 memset(mtpair, 0, sizeof(mtpair));
2044 struct mntent *mtother = (mtcur==mtpair ? mtpair+1 : mtpair);
2046 // Get next fstab entry
2047 if (!getmntent_r(fstab, mtcur, getmntent_buf
2048 + (mtcur==mtpair ? GETMNTENT_BUFSIZE/2 : 0),
2049 GETMNTENT_BUFSIZE/2)
2050 ) { // End of fstab/mtab is reached
2051 mtcur = mtother; // the thing we found last time
2055 // If we're trying to mount something specific and this isn't it,
2056 // skip it. Note we must match the exact text in fstab (ala
2057 // "proc") or a full path from root
2060 // Is this what we're looking for?
2061 if (strcmp(argv[0], mtcur->mnt_fsname) != 0
2062 && strcmp(storage_path, mtcur->mnt_fsname) != 0
2063 && strcmp(argv[0], mtcur->mnt_dir) != 0
2064 && strcmp(storage_path, mtcur->mnt_dir) != 0
2069 // Remember this entry. Something later may have
2070 // overmounted it, and we want the _last_ match.
2073 // If we're mounting all
2076 // No, mount -a won't mount anything,
2077 // even user mounts, for mere humans
2079 bb_error_msg_and_die(bb_msg_you_must_be_root);
2081 // Does type match? (NULL matches always)
2082 if (!match_fstype(mtcur, fstype))
2085 // Skip noauto and swap anyway
2086 if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
2087 // swap is bogus "fstype", parse_mount_options can't check fstypes
2088 || strcasecmp(mtcur->mnt_type, "swap") == 0
2093 // Does (at least one) option match?
2094 // (NULL matches always)
2095 if (!match_opt(mtcur->mnt_opts, O_optmatch))
2098 resolve_mount_spec(&mtcur->mnt_fsname);
2100 // NFS mounts want this to be xrealloc-able
2101 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2103 // If nothing is mounted on this directory...
2104 // (otherwise repeated "mount -a" mounts everything again)
2105 mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2106 // We do not check fsname match of found mount point -
2107 // "/" may have fsname of "/dev/root" while fstab
2108 // says "/dev/something_else".
2111 bb_error_msg("according to %s, "
2112 "%s is already mounted on %s",
2114 mp->mnt_fsname, mp->mnt_dir);
2117 // ...mount this thing
2118 if (singlemount(mtcur, /*ignore_busy:*/ 1)) {
2119 // Count number of failed mounts
2123 free(mtcur->mnt_opts);
2127 // End of fstab/mtab is reached.
2128 // Were we looking for something specific?
2129 if (argv[0]) { // yes
2132 // If we didn't find anything, complain
2133 if (!mtcur->mnt_fsname)
2134 bb_error_msg_and_die("can't find %s in %s",
2135 argv[0], fstabname);
2137 // What happens when we try to "mount swap_partition"?
2138 // (fstab containts "swap_partition swap swap defaults 0 0")
2139 // util-linux-ng 2.13.1 does this:
2140 // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
2141 // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
2142 // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
2143 // write(2, "mount: mount point swap does not exist\n", 39) = 39
2144 // exit_group(32) = ?
2146 // In case we want to simply skip swap partitions:
2147 l = parse_mount_options(mtcur->mnt_opts, NULL);
2148 if ((l & MOUNT_SWAP)
2149 // swap is bogus "fstype", parse_mount_options can't check fstypes
2150 || strcasecmp(mtcur->mnt_type, "swap") == 0
2156 // fstab must have "users" or "user"
2157 l = parse_mount_options(mtcur->mnt_opts, NULL);
2158 if (!(l & MOUNT_USERS))
2159 bb_error_msg_and_die(bb_msg_you_must_be_root);
2162 //util-linux-2.12 does not do this check.
2163 //// If nothing is mounted on this directory...
2164 //// (otherwise repeated "mount FOO" mounts FOO again)
2165 //mp = find_mount_point(mtcur->mnt_dir, /*subdir_too:*/ 0);
2167 // bb_error_msg("according to %s, "
2168 // "%s is already mounted on %s",
2169 // bb_path_mtab_file,
2170 // mp->mnt_fsname, mp->mnt_dir);
2172 // ...mount the last thing we found
2173 mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
2174 append_mount_options(&(mtcur->mnt_opts), cmdopts);
2175 resolve_mount_spec(&mtpair->mnt_fsname);
2176 rc = singlemount(mtcur, /*ignore_busy:*/ 0);
2177 if (ENABLE_FEATURE_CLEAN_UP)
2178 free(mtcur->mnt_opts);
2183 if (ENABLE_FEATURE_CLEAN_UP)
2185 if (ENABLE_FEATURE_CLEAN_UP) {
2190 //TODO: exitcode should be ORed mask of (from "man mount"):
2192 // 1 incorrect invocation or permissions
2193 // 2 system error (out of memory, cannot fork, no more loop devices)
2194 // 4 internal mount bug or missing nfs support in mount
2196 //16 problems writing or locking /etc/mtab
2198 //64 some mount succeeded