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|MS_NOEXEC|MS_NOSUID|MS_NODEV },
103 /* Allow ordinary user to mount */
104 { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
105 { "user", 1, 0, MS_USER|MS_NOEXEC|MS_NOSUID|MS_NODEV },
106 /* Allow ordinary user to mount */
107 { "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */
108 { "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */
109 { "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */
110 { "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */
111 { "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */
112 { "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */
113 { "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/
115 /* add new options here */
117 { "sub", 0, 1, MS_NOSUB }, /* allow submounts */
118 { "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
121 { "quiet", 0, 0, MS_SILENT }, /* be quiet */
122 { "loud", 0, 1, MS_SILENT }, /* print out messages. */
125 { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
126 { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
128 { "loop", 1, 0, MS_DUMMY }, /* use a loop device */
130 { "atime", 0, 1, MS_NOATIME }, /* Update access time */
131 { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
134 { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
135 { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
140 /* Try to build a canonical options string. */
141 static char * fix_opts_string (int flags, const char *extra_opts) {
142 const struct opt_map *om;
145 new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
146 if (flags & MS_USER) {
147 /* record who mounted this so they can unmount */
148 struct passwd *pw = getpwuid(getuid());
150 new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name);
152 if (flags & MS_USERS)
153 new_opts = xstrconcat3(new_opts, ",users", "");
155 for (om = opt_map; om->opt != NULL; om++) {
158 if (om->inv || !om->mask || (flags & om->mask) != om->mask)
160 new_opts = xstrconcat3(new_opts, ",", om->opt);
163 if (extra_opts && *extra_opts) {
164 new_opts = xstrconcat3(new_opts, ",", extra_opts);
170 int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno)
175 ment.mnt_fsname = fsname;
176 ment.mnt_dir = mount_point;
177 ment.mnt_type = fstype;
178 ment.mnt_opts = fix_opts_string(flags, opts);
182 if(flags & MS_REMOUNT) {
183 update_mtab(ment.mnt_dir, &ment);
189 if ((mtab = setmntent(MOUNTED, "a+")) == NULL) {
190 fprintf(stderr, "Can't open " MOUNTED);
194 if (addmntent(mtab, &ment) == 1) {
197 fprintf(stderr, "Can't write mount entry");
201 if (fchmod(fileno(mtab), 0644) == -1) {
204 fprintf(stderr, "Can't set perms on " MOUNTED);
215 int do_mount_syscall(char *spec, char *node, char *type, int flags, void *data)
217 return mount(spec, node, type, flags, data);
222 printf("usage: %s remotetarget dir [-rvVwfnh] [-t version] [-o nfsoptions]\n", progname);
223 printf("options:\n\t-r\t\tMount file system readonly\n");
224 printf("\t-v\t\tVerbose\n");
225 printf("\t-V\t\tPrint version\n");
226 printf("\t-w\t\tMount file system read-write\n");
227 printf("\t-f\t\tFake mount, don't actually mount\n");
228 printf("\t-n\t\tDo not update /etc/mtab\n");
229 printf("\t-s\t\tTolerate sloppy mount options rather than failing.\n");
230 printf("\t-h\t\tPrint this help\n");
231 printf("\tversion\t\tnfs4 - NFS version 4, nfs - older NFS version supported\n");
232 printf("\tnfsoptions\tRefer mount.nfs(8) or nfs(5)\n\n");
236 parse_opt(const char *opt, int *mask, char *extra_opts, int len) {
237 const struct opt_map *om;
239 for (om = opt_map; om->opt != NULL; om++) {
240 if (!strcmp (opt, om->opt)) {
249 len -= strlen(extra_opts);
251 if (*extra_opts && --len > 0)
252 strcat(extra_opts, ",");
254 if ((len -= strlen(opt)) > 0)
255 strcat(extra_opts, opt);
258 /* Take -o options list and compute 4th and 5th args to mount(2). flags
259 gets the standard options (indicated by bits) and extra_opts all the rest */
260 static void parse_opts (const char *options, int *flags, char **extra_opts)
262 if (options != NULL) {
263 char *opts = xstrdup(options);
265 int len = strlen(opts);
268 *extra_opts = xmalloc(len);
271 for (p=opts, opt=NULL; p && *p; p++) {
273 opt = p; /* begin of the option item */
275 open_quote ^= 1; /* reverse the status */
277 continue; /* still in a quoted block */
279 *p = '\0'; /* terminate the option item */
280 /* end of option item or last item */
281 if (*p == '\0' || *(p+1) == '\0') {
282 parse_opt(opt, flags, *extra_opts, len);
290 static void mount_error(char *node)
294 fprintf(stderr, "%s: mount point %s is not a directory\n", progname, node);
297 fprintf(stderr, "%s: %s is already mounted or busy\n", progname, node);
300 fprintf(stderr, "%s: mount point %s does not exist\n", progname, node);
303 fprintf(stderr, "%s: %s\n", progname, strerror(errno));
307 static void start_statd()
309 /* If /var/run/rpc.statd.pid exists and is non-empty,
310 * assume statd already running.
311 * If START_STATD not defined, or defined to a non-existent file,
313 * else run that file (typically a shell script)
316 if (stat("/var/run/rpc.statd.pid", &stb) == 0 &&
320 if (stat(START_STATD, &stb) ==0 &&
321 S_ISREG(stb.st_mode) &&
322 (stb.st_mode & S_IXUSR))
327 int main(int argc, char *argv[])
329 int c, flags = 0, nfs_mount_vers = 0, mnt_err = 1, fake = 0;
330 char *spec, *mount_point, *extra_opts = NULL;
331 char *mount_opts = NULL, *p;
332 uid_t uid = getuid();
338 if ((p = strrchr(progname, '/')) != NULL)
341 if(!strncmp(progname, "umount", strlen("umount"))) {
346 exit(nfsumount(argc, argv) ? 0 : 1);
349 if(argv[1] && argv[1][0] == '-') {
350 if(argv[1][1] == 'V')
351 printf("%s ("PACKAGE_STRING")\n", progname);
363 mount_point = argv[2];
365 argv[2] = argv[0]; /* so that getopt error messages are correct */
366 while ((c = getopt_long (argc - 2, argv + 2, "rt:vVwfno:hs",
367 longopts, NULL)) != -1) {
373 if (strcmp(optarg, "nfs4") == 0)
375 else if (strcmp(optarg, "nfs") == 0)
378 fprintf(stderr, "%s: unknown filesystem type: %s\n",
387 printf("%s: ("PACKAGE_STRING")\n", progname);
398 case 'o': /* specify mount options */
400 mount_opts = xstrconcat3(mount_opts, ",", optarg);
402 mount_opts = xstrdup(optarg);
410 case 129: /* replace */
411 mounttype = MS_REPLACE;
413 case 130: /* after */
414 mounttype = MS_AFTER;
416 case 131: /* before */
417 mounttype = MS_BEFORE;
425 case 135: /* rbind */
426 mounttype = MS_BIND | MS_REC;
434 if (optind != argc-2) {
435 /* Extra non-option words at the end... */
440 if (strcmp(progname, "mount.nfsv4") == 0)
444 /* don't even think about it unless options exactly
447 struct mntentchn *mc;
449 if ((mc = getfsfile(mount_point)) == NULL ||
450 strcmp(mc->m.mnt_fsname, spec) != 0 ||
451 strcmp(mc->m.mnt_type, (nfs_mount_vers == 4 ? "nfs4":"nfs")) != 0
453 fprintf(stderr, "%s: permission died - no match for fstab\n",
457 /* 'mount' munges the options from fstab before passing them
458 * to us, so it is non-trivial to test that we have the correct
459 * set of options and we don't want to trust what the user
460 * gave us, so just take whatever is in fstab
462 mount_opts = strdup(mc->m.mnt_opts);
466 mount_point = canonicalize(mount_point);
467 if (mount_point == NULL ||
468 mount_point[0] != '/') {
469 fprintf(stderr, "%s: unknown mount point %s\n",
470 progname, mount_point ? : "");
474 parse_opts(mount_opts, &flags, &extra_opts);
477 if (! (flags & (MS_USERS | MS_USER))) {
478 fprintf(stderr, "%s: permission denied\n", progname);
483 if (nfs_mount_vers == 4)
484 mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0);
487 mnt_err = nfsmount(spec, mount_point, &flags,
488 &extra_opts, &mount_opts,
490 if (!mnt_err && !fake && need_statd)
498 mnt_err = do_mount_syscall(spec, mount_point,
499 nfs_mount_vers == 4 ? "nfs4" : "nfs",
500 flags & ~(MS_USER|MS_USERS) ,
504 mount_error(mount_point);
510 add_mtab(spec, mount_point,
511 nfs_mount_vers == 4 ? "nfs4" : "nfs",
512 flags, extra_opts, 0, 0);