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>
34 #include "mount_constants.h"
35 #include "nfs_paths.h"
37 #include "nfs_mount.h"
38 #include "nfs4_mount.h"
39 #include "nfsumount.h"
48 static struct option longopts[] = {
49 { "fake", 0, 0, 'f' },
50 { "help", 0, 0, 'h' },
51 { "no-mtab", 0, 0, 'n' },
52 { "read-only", 0, 0, 'r' },
54 { "verbose", 0, 0, 'v' },
55 { "version", 0, 0, 'V' },
56 { "read-write", 0, 0, 'w' },
58 { "options", 1, 0, 'o' },
59 { "nfsvers", 1, 0, 't' },
60 { "bind", 0, 0, 128 },
61 { "replace", 0, 0, 129 },
62 { "after", 0, 0, 130 },
63 { "before", 0, 0, 131 },
64 { "over", 0, 0, 132 },
65 { "move", 0, 0, 133 },
66 { "rbind", 0, 0, 135 },
70 /* Map from -o and fstab option strings to the flag argument to mount(2). */
72 const char *opt; /* option name */
73 int skip; /* skip in mtab option string */
74 int inv; /* true if flag value should be inverted */
75 int mask; /* flag mask value */
78 static const struct opt_map opt_map[] = {
79 { "defaults", 0, 0, 0 }, /* default options */
80 { "ro", 1, 0, MS_RDONLY }, /* read-only */
81 { "rw", 1, 1, MS_RDONLY }, /* read-write */
82 { "exec", 0, 1, MS_NOEXEC }, /* permit execution of binaries */
83 { "noexec", 0, 0, MS_NOEXEC }, /* don't execute binaries */
84 { "suid", 0, 1, MS_NOSUID }, /* honor suid executables */
85 { "nosuid", 0, 0, MS_NOSUID }, /* don't honor suid executables */
86 { "dev", 0, 1, MS_NODEV }, /* interpret device files */
87 { "nodev", 0, 0, MS_NODEV }, /* don't interpret devices */
88 { "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */
89 { "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */
90 { "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */
91 { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */
92 { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */
93 { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */
95 /* add new options here */
97 { "sub", 0, 1, MS_NOSUB }, /* allow submounts */
98 { "nosub", 0, 0, MS_NOSUB }, /* don't allow submounts */
101 { "quiet", 0, 0, MS_SILENT }, /* be quiet */
102 { "loud", 0, 1, MS_SILENT }, /* print out messages. */
105 { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */
106 { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */
109 { "atime", 0, 1, MS_NOATIME }, /* Update access time */
110 { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */
113 { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */
114 { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */
119 /* Try to build a canonical options string. */
120 static char * fix_opts_string (int flags, const char *extra_opts) {
121 const struct opt_map *om;
124 new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw");
125 for (om = opt_map; om->opt != NULL; om++) {
128 if (om->inv || !om->mask || (flags & om->mask) != om->mask)
130 new_opts = xstrconcat3(new_opts, ",", om->opt);
133 if (extra_opts && *extra_opts) {
134 new_opts = xstrconcat3(new_opts, ",", extra_opts);
140 int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno)
145 ment.mnt_fsname = fsname;
146 ment.mnt_dir = mount_point;
147 ment.mnt_type = fstype;
148 ment.mnt_opts = fix_opts_string(flags, opts);
154 if ((mtab = setmntent(MOUNTED, "a+")) == NULL) {
155 fprintf(stderr, "Can't open " MOUNTED);
159 if (addmntent(mtab, &ment) == 1) {
162 fprintf(stderr, "Can't write mount entry");
166 if (fchmod(fileno(mtab), 0644) == -1) {
169 fprintf(stderr, "Can't set perms on " MOUNTED);
180 int do_mount_syscall(char *spec, char *node, char *type, int flags, void *data)
182 return mount(spec, node, type, flags, data);
187 printf("usage: %s remotetarget dir [-rvVwfnh] [-t version] [-o nfsoptions]\n", progname);
188 printf("options:\n\t-r\t\tMount file system readonly\n");
189 printf("\t-v\t\tVerbose\n");
190 printf("\t-V\t\tPrint version\n");
191 printf("\t-w\t\tMount file system read-write\n");
192 printf("\t-f\t\tFake mount, don't actually mount\n");
193 printf("\t-n\t\tDo not update /etc/mtab\n");
194 printf("\t-s\t\tTolerate sloppy mount options rather than failing.\n");
195 printf("\t-h\t\tPrint this help\n");
196 printf("\tversion\t\tnfs4 - NFS version 4, nfs - older NFS version supported\n");
197 printf("\tnfsoptions\tRefer mount.nfs(8) or nfs(5)\n\n");
201 parse_opt(const char *opt, int *mask, char *extra_opts, int len) {
202 const struct opt_map *om;
204 for (om = opt_map; om->opt != NULL; om++) {
205 if (!strcmp (opt, om->opt)) {
214 len -= strlen(extra_opts);
216 if (*extra_opts && --len > 0)
217 strcat(extra_opts, ",");
219 if ((len -= strlen(opt)) > 0)
220 strcat(extra_opts, opt);
223 /* Take -o options list and compute 4th and 5th args to mount(2). flags
224 gets the standard options (indicated by bits) and extra_opts all the rest */
225 static void parse_opts (const char *options, int *flags, char **extra_opts)
227 if (options != NULL) {
228 char *opts = xstrdup(options);
230 int len = strlen(opts) + 20;
232 *extra_opts = xmalloc(len);
235 for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ","))
236 parse_opt(opt, flags, *extra_opts, len);
243 static void mount_error(char *node)
247 printf("%s: mount point %s is not a directory\n", progname, node);
250 printf("%s: %s is already mounted or busy\n", progname, node);
253 printf("%s: mount point %s does not exist\n", progname, node);
256 printf("%s: %s\n", progname, strerror(errno));
260 static void start_statd()
262 /* If /var/run/rpc.statd.pid exists and is non-empty,
263 * assume statd already running.
264 * If START_STATD not defined, or defined to a non-existent file,
266 * else run that file (typically a shell script)
269 if (stat("/var/run/rpc.statd.pid", &stb) == 0 &&
273 if (stat(START_STATD, &stb) ==0 &&
274 S_ISREG(stb.st_mode) &&
275 (stb.st_mode & S_IXUSR))
280 int main(int argc, char *argv[])
282 int c, flags = 0, nfs_mount_vers = 0, mnt_err = 1, fake = 0;
283 char *spec, *mount_point, *extra_opts = NULL;
284 char *mount_opts = NULL, *p;
287 if ((p = strrchr(progname, '/')) != NULL)
291 printf("%s: only root can do that.\n", progname);
295 if(!strncmp(progname, "umount", strlen("umount"))) {
300 exit(nfsumount(argc, argv) ? 0 : 1);
308 if(argv[1][0] == '-') {
309 if(argv[1][1] == 'V')
310 printf("%s ("PACKAGE_STRING")\n", progname);
316 while ((c = getopt_long (argc - 2, argv + 2, "rt:vVwfno:hs",
317 longopts, NULL)) != -1) {
323 nfs_mount_vers = (strncmp(optarg, "nfs4", 4)) ? 0 : 4;
329 printf("%s: ("PACKAGE_STRING")\n", progname);
340 case 'o': /* specify mount options */
342 mount_opts = xstrconcat3(mount_opts, ",", optarg);
344 mount_opts = xstrdup(optarg);
352 case 129: /* replace */
353 mounttype = MS_REPLACE;
355 case 130: /* after */
356 mounttype = MS_AFTER;
358 case 131: /* before */
359 mounttype = MS_BEFORE;
367 case 135: /* rbind */
368 mounttype = MS_BIND | MS_REC;
378 mount_point = canonicalize(argv[2]);
380 parse_opts(mount_opts, &flags, &extra_opts);
382 if (!strcmp(progname, "mount.nfs4") || nfs_mount_vers == 4) {
384 mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0);
386 else if (!strcmp(progname, "mount.nfs")) {
388 mnt_err = nfsmount(spec, mount_point, &flags,
389 &extra_opts, &mount_opts,
391 if (!mnt_err && !fake && need_statd)
400 mnt_err = do_mount_syscall(spec, mount_point,
401 nfs_mount_vers == 4 ? "nfs4" : "nfs",
405 mount_error(mount_point);
410 add_mtab(spec, mount_point,
411 nfs_mount_vers == 4 ? "nfs4" : "nfs",
412 flags, extra_opts, 0, 0);