2 * mount.c -- Linux NFS mount
4 * Copyright (C) 2006 Amit Gud <agud@redhat.com>
6 * - Basic code and wrapper around mount and umount code of NFS.
7 * Based on util-linux/mount/mount.c.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
23 #include <sys/types.h>
28 #include <sys/mount.h>
35 #include "mount_constants.h"
36 #include "nfs_paths.h"
38 #include "nfs_mount.h"
39 #include "nfs4_mount.h"
40 #include "nfsumount.h"
49 static struct option longopts[] = {
50 { "fake", 0, 0, 'f' },
51 { "help", 0, 0, 'h' },
52 { "no-mtab", 0, 0, 'n' },
53 { "read-only", 0, 0, 'r' },
55 { "verbose", 0, 0, 'v' },
56 { "version", 0, 0, 'V' },
57 { "read-write", 0, 0, 'w' },
59 { "options", 1, 0, 'o' },
60 { "nfsvers", 1, 0, 't' },
61 { "bind", 0, 0, 128 },
62 { "replace", 0, 0, 129 },
63 { "after", 0, 0, 130 },
64 { "before", 0, 0, 131 },
65 { "over", 0, 0, 132 },
66 { "move", 0, 0, 133 },
67 { "rbind", 0, 0, 135 },
71 /* Map from -o and fstab option strings to the flag argument to mount(2). */
73 const char *opt; /* option name */
74 int skip; /* skip in mtab option string */
75 int inv; /* true if flag value should be inverted */
76 int mask; /* flag mask value */
79 /* Custom mount options for our own purposes. */
80 #define MS_DUMMY 0x00000000
81 #define MS_USERS 0x40000000
82 #define MS_USER 0x80000000
84 static const struct opt_map opt_map[] = {
85 { "defaults", 0, 0, 0 }, /* default options */
86 { "ro", 1, 0, MS_RDONLY }, /* read-only */
87 { "rw", 1, 1, MS_RDONLY }, /* read-write */
88 { "exec", 0, 1, MS_NOEXEC }, /* permit execution of binaries */
89 { "noexec", 0, 0, MS_NOEXEC }, /* don't execute binaries */
90 { "suid", 0, 1, MS_NOSUID }, /* honor suid executables */
91 { "nosuid", 0, 0, MS_NOSUID }, /* don't honor suid executables */
92 { "dev", 0, 1, MS_NODEV }, /* interpret device files */
93 { "nodev", 0, 0, MS_NODEV }, /* don't interpret devices */
94 { "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */
95 { "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
96 { "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */
97 { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */
98 { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */
99 { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */
100 { "auto", 0, 0, MS_DUMMY }, /* Can be mounted using -a */
101 { "noauto", 0, 0, MS_DUMMY }, /* Can only be mounted explicitly */
102 { "users", 1, 0, MS_USERS }, /* Allow ordinary user to mount */
103 { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
104 { "user", 1, 0, MS_USER }, /* Allow ordinary user to mount */
105 { "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
106 { "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */
107 { "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */
108 { "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */
109 { "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */
110 { "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */
111 { "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/
113 /* add new options here */
115 { "sub", 0, 1, MS_NOSUB }, /* allow submounts */
116 { "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
119 { "quiet", 0, 0, MS_SILENT }, /* be quiet */
120 { "loud", 0, 1, MS_SILENT }, /* print out messages. */
123 { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
124 { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
126 { "loop", 1, 0, MS_DUMMY }, /* use a loop device */
128 { "atime", 0, 1, MS_NOATIME }, /* Update access time */
129 { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
132 { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
133 { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
138 /* Try to build a canonical options string. */
139 static char * fix_opts_string (int flags, const char *extra_opts) {
140 const struct opt_map *om;
143 new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
144 if (flags & MS_USER) {
145 /* record who mounted this so they can unmount */
146 struct passwd *pw = getpwuid(getuid());
148 new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name);
150 if (flags & MS_USERS)
151 new_opts = xstrconcat3(new_opts, ",users", "");
153 for (om = opt_map; om->opt != NULL; om++) {
156 if (om->inv || !om->mask || (flags & om->mask) != om->mask)
158 new_opts = xstrconcat3(new_opts, ",", om->opt);
161 if (extra_opts && *extra_opts) {
162 new_opts = xstrconcat3(new_opts, ",", extra_opts);
168 int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno)
173 ment.mnt_fsname = fsname;
174 ment.mnt_dir = mount_point;
175 ment.mnt_type = fstype;
176 ment.mnt_opts = fix_opts_string(flags, opts);
180 if(flags & MS_REMOUNT) {
181 update_mtab(ment.mnt_dir, &ment);
187 if ((mtab = setmntent(MOUNTED, "a+")) == NULL) {
188 fprintf(stderr, "Can't open " MOUNTED);
192 if (addmntent(mtab, &ment) == 1) {
195 fprintf(stderr, "Can't write mount entry");
199 if (fchmod(fileno(mtab), 0644) == -1) {
202 fprintf(stderr, "Can't set perms on " MOUNTED);
213 int do_mount_syscall(char *spec, char *node, char *type, int flags, void *data)
215 return mount(spec, node, type, flags, data);
220 printf("usage: %s remotetarget dir [-rvVwfnh] [-t version] [-o nfsoptions]\n", progname);
221 printf("options:\n\t-r\t\tMount file system readonly\n");
222 printf("\t-v\t\tVerbose\n");
223 printf("\t-V\t\tPrint version\n");
224 printf("\t-w\t\tMount file system read-write\n");
225 printf("\t-f\t\tFake mount, don't actually mount\n");
226 printf("\t-n\t\tDo not update /etc/mtab\n");
227 printf("\t-s\t\tTolerate sloppy mount options rather than failing.\n");
228 printf("\t-h\t\tPrint this help\n");
229 printf("\tversion\t\tnfs4 - NFS version 4, nfs - older NFS version supported\n");
230 printf("\tnfsoptions\tRefer mount.nfs(8) or nfs(5)\n\n");
234 parse_opt(const char *opt, int *mask, char *extra_opts, int len) {
235 const struct opt_map *om;
237 for (om = opt_map; om->opt != NULL; om++) {
238 if (!strcmp (opt, om->opt)) {
247 len -= strlen(extra_opts);
249 if (*extra_opts && --len > 0)
250 strcat(extra_opts, ",");
252 if ((len -= strlen(opt)) > 0)
253 strcat(extra_opts, opt);
256 /* Take -o options list and compute 4th and 5th args to mount(2). flags
257 gets the standard options (indicated by bits) and extra_opts all the rest */
258 static void parse_opts (const char *options, int *flags, char **extra_opts)
260 if (options != NULL) {
261 char *opts = xstrdup(options);
263 int len = strlen(opts) + 1; /* include room for a null */
266 *extra_opts = xmalloc(len);
269 for (p=opts, opt=NULL; p && *p; p++) {
271 opt = p; /* begin of the option item */
273 open_quote ^= 1; /* reverse the status */
275 continue; /* still in a quoted block */
277 *p = '\0'; /* terminate the option item */
278 /* end of option item or last item */
279 if (*p == '\0' || *(p+1) == '\0') {
280 parse_opt(opt, flags, *extra_opts, len);
288 static void mount_error(char *node)
292 fprintf(stderr, "%s: mount point %s is not a directory\n", progname, node);
295 fprintf(stderr, "%s: %s is already mounted or busy\n", progname, node);
298 fprintf(stderr, "%s: mount point %s does not exist\n", progname, node);
301 fprintf(stderr, "%s: %s\n", progname, strerror(errno));
305 static void start_statd()
307 /* If /var/run/rpc.statd.pid exists and is non-empty,
308 * assume statd already running.
309 * If START_STATD not defined, or defined to a non-existent file,
311 * else run that file (typically a shell script)
314 if (stat("/var/run/rpc.statd.pid", &stb) == 0 &&
318 if (stat(START_STATD, &stb) ==0 &&
319 S_ISREG(stb.st_mode) &&
320 (stb.st_mode & S_IXUSR))
325 int main(int argc, char *argv[])
327 int c, flags = 0, nfs_mount_vers = 0, mnt_err = 1, fake = 0;
328 char *spec, *mount_point, *extra_opts = NULL;
329 char *mount_opts = NULL, *p;
330 uid_t uid = getuid();
336 if ((p = strrchr(progname, '/')) != NULL)
339 if(!strncmp(progname, "umount", strlen("umount"))) {
344 exit(nfsumount(argc, argv) ? 0 : 1);
347 if(argv[1] && argv[1][0] == '-') {
348 if(argv[1][1] == 'V')
349 printf("%s ("PACKAGE_STRING")\n", progname);
361 mount_point = argv[2];
363 argv[2] = argv[0]; /* so that getopt error messages are correct */
364 while ((c = getopt_long (argc - 2, argv + 2, "rt:vVwfno:hs",
365 longopts, NULL)) != -1) {
371 if (strcmp(optarg, "nfs4") == 0)
373 else if (strcmp(optarg, "nfs") == 0)
376 fprintf(stderr, "%s: unknown filesystem type: %s\n",
385 printf("%s: ("PACKAGE_STRING")\n", progname);
396 case 'o': /* specify mount options */
398 mount_opts = xstrconcat3(mount_opts, ",", optarg);
400 mount_opts = xstrdup(optarg);
408 case 129: /* replace */
409 mounttype = MS_REPLACE;
411 case 130: /* after */
412 mounttype = MS_AFTER;
414 case 131: /* before */
415 mounttype = MS_BEFORE;
423 case 135: /* rbind */
424 mounttype = MS_BIND | MS_REC;
432 if (optind != argc-2) {
433 /* Extra non-option words at the end... */
438 if (strcmp(progname, "mount.nfs4") == 0)
442 /* don't even think about it unless options exactly
445 struct mntentchn *mc;
447 if ((mc = getfsfile(mount_point)) == NULL ||
448 strcmp(mc->m.mnt_fsname, spec) != 0 ||
449 strcmp(mc->m.mnt_type, (nfs_mount_vers == 4 ? "nfs4":"nfs")) != 0
451 fprintf(stderr, "%s: permission died - no match for fstab\n",
455 /* 'mount' munges the options from fstab before passing them
456 * to us, so it is non-trivial to test that we have the correct
457 * set of options and we don't want to trust what the user
458 * gave us, so just take whatever is in fstab
460 mount_opts = strdup(mc->m.mnt_opts);
464 mount_point = canonicalize(mount_point);
465 if (mount_point == NULL ||
466 mount_point[0] != '/') {
467 fprintf(stderr, "%s: unknown mount point %s\n",
468 progname, mount_point ? : "");
472 parse_opts(mount_opts, &flags, &extra_opts);
475 if (! (flags & (MS_USERS | MS_USER))) {
476 fprintf(stderr, "%s: permission denied\n", progname);
481 if (nfs_mount_vers == 4)
482 mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0);
485 mnt_err = nfsmount(spec, mount_point, &flags,
486 &extra_opts, &mount_opts,
488 if (!mnt_err && !fake && need_statd)
496 mnt_err = do_mount_syscall(spec, mount_point,
497 nfs_mount_vers == 4 ? "nfs4" : "nfs",
498 flags & ~(MS_USER|MS_USERS) ,
502 mount_error(mount_point);
508 add_mtab(spec, mount_point,
509 nfs_mount_vers == 4 ? "nfs4" : "nfs",
510 flags, extra_opts, 0, 0);