Major mount(8) refactor
This commit is contained in:
Hiltjo Posthuma
sin
parent
14716af472
commit
35e3f401ab
196
mount.c
196
mount.c
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@ -15,46 +15,79 @@ struct {
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const char *notopt;
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unsigned long v;
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} optnames[] = {
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{ "remount", NULL, MS_REMOUNT },
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{ "ro", "rw", MS_RDONLY },
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{ "sync", "async", MS_SYNCHRONOUS },
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{ "dirsync", NULL, MS_DIRSYNC },
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{ "nodev", "dev", MS_NODEV },
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{ "noatime", "atime", MS_NOATIME },
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{ "nodiratime", "diratime", MS_NODIRATIME },
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{ "noexec", "exec", MS_NOEXEC },
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{ "nosuid", "suid", MS_NOSUID },
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{ "mand", "nomand", MS_MANDLOCK },
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{ "relatime", "norelatime", MS_RELATIME },
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{ NULL, NULL, 0 }
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{ "remount", NULL, MS_REMOUNT },
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{ "ro", "rw", MS_RDONLY },
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{ "sync", "async", MS_SYNCHRONOUS },
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{ "dirsync", NULL, MS_DIRSYNC },
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{ "nodev", "dev", MS_NODEV },
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{ "noatime", "atime", MS_NOATIME },
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{ "nodiratime", "diratime", MS_NODIRATIME },
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{ "noexec", "exec", MS_NOEXEC },
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{ "nosuid", "suid", MS_NOSUID },
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{ "mand", "nomand", MS_MANDLOCK },
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{ "relatime", "norelatime", MS_RELATIME },
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{ "bind", NULL, MS_BIND },
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{ NULL, NULL, 0 }
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};
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static struct option {
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static void
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parseopts(char *popts, unsigned long *flags, char *data, size_t bufsiz)
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{
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unsigned int i, validopt;
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size_t optlen, dlen = 0;
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char *name;
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struct option *next;
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} *opthead;
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data[0] = '\0';
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for(name = strtok(popts, ","); name; name = strtok(NULL, ",")) {
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validopt = 0;
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for(i = 0; optnames[i].v; i++) {
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if(optnames[i].opt && strcmp(name, optnames[i].opt) == 0) {
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*flags |= optnames[i].v;
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validopt = 1;
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break;
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}
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if(optnames[i].notopt && strcmp(name, optnames[i].notopt) == 0) {
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*flags &= ~optnames[i].v;
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validopt = 1;
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break;
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}
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}
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if(!validopt) {
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/* unknown option, pass as data option to mount() */
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if((optlen = strlen(name))) {
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if(dlen + optlen + 2 >= bufsiz)
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return; /* prevent overflow */
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if(dlen)
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data[dlen++] = ',';
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memcpy(&data[dlen], name, optlen);
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dlen += optlen;
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data[dlen] = '\0';
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}
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}
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}
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-BMRadn] [-t fstype] [-o options] [source] [target]\n",
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eprintf("usage: %s [-BMRan] [-t fstype] [-o options] [source] [target]\n",
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argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int i, validopt;
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int oflag = 0, aflag = 0;
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int aflag = 0, i;
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unsigned long flags = 0;
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char *types = NULL, *arg = NULL, *p;
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const char *source;
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const char *target;
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struct stat st1, st2;
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void *data = NULL;
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char *types = NULL, data[512];
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char *files[] = { "/proc/mounts", "/etc/fstab", NULL };
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size_t datasiz = sizeof(data);
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const char *source, *target;
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struct stat st;
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struct mntent *me = NULL;
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FILE *fp;
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struct option *opt, *tmp;
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data[0] = '\0';
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ARGBEGIN {
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case 'B':
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@ -69,22 +102,8 @@ main(int argc, char *argv[])
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case 'a':
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aflag = 1;
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break;
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case 'd':
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data = EARGF(usage());
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break;
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case 'o':
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oflag = 1;
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arg = EARGF(usage());
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for (p = strtok(arg, ","); p; p = strtok(NULL, ",")) {
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opt = malloc(sizeof(*opt));
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if (!opt)
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eprintf("malloc:");
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opt->name = strdup(p);
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if (!opt->name)
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eprintf("strdup:");
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opt->next = opthead;
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opthead = opt;
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}
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parseopts(EARGF(usage()), &flags, data, datasiz);
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break;
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case 't':
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types = EARGF(usage());
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@ -95,85 +114,60 @@ main(int argc, char *argv[])
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usage();
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} ARGEND;
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if (argc < 1 && aflag == 0)
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if(argc < 1 && aflag == 0)
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usage();
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for (opt = opthead; opt; opt = opt->next) {
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validopt = 0;
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for (i = 0; optnames[i].v; i++) {
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if (optnames[i].opt) {
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if (!strcmp(opt->name,
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optnames[i].opt)) {
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flags |= optnames[i].v;
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validopt = 1;
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break;
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}
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}
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if (optnames[i].notopt) {
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if (!strcmp(opt->name,
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optnames[i].notopt)) {
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flags &= ~optnames[i].v;
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validopt = 1;
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break;
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}
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}
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}
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if (!validopt)
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break;
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}
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if (oflag && !validopt)
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eprintf("unknown option: %s\n", opt->name);
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if (aflag == 1)
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goto domount;
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if(aflag == 1)
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goto mountall;
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source = argv[0];
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target = argv[1];
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if (!target) {
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if(!target) {
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target = argv[0];
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source = NULL;
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if (stat(target, &st1) < 0)
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if(stat(target, &st) < 0)
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eprintf("stat %s:", target);
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fp = setmntent("/proc/mounts", "r");
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if (!fp)
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eprintf("setmntent %s:", "/proc/mounts");
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while ((me = getmntent(fp))) {
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if (stat(me->mnt_dir, &st2) < 0)
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eprintf("stat %s:", me->mnt_dir);
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if (st1.st_dev == st2.st_dev &&
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st1.st_ino == st2.st_ino) {
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source = strdup(me->mnt_fsname);
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break;
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}
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for(i = 0; files[i]; i++) {
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if((fp = setmntent(files[i], "r"))) {
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while((me = getmntent(fp))) {
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if(strcmp(me->mnt_dir, target) == 0 ||
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strcmp(me->mnt_fsname, target) == 0) {
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source = me->mnt_fsname;
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target = me->mnt_dir;
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if(!types)
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types = me->mnt_type;
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goto mountsingle;
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}
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}
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endmntent(fp);
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fp = NULL;
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} else {
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fprintf(stderr, "setmntent %s: %s\n", files[i], strerror(errno));
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}
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endmntent(fp);
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if (!source)
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eprintf("can't find %s mountpoint\n", target);
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}
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if(!source)
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eprintf("can't find %s mountpoint\n", target);
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if (mount(source, target, types, flags, data) < 0)
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mountsingle:
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if(mount(source, target, types, flags, data) < 0)
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eprintf("mount:");
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domount:
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if (aflag == 1) {
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fp = setmntent("/etc/fstab", "r");
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if (!fp)
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eprintf("setmntent %s:", "/etc/fstab");
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while ((me = getmntent(fp)))
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if (mount(me->mnt_fsname, me->mnt_dir, me->mnt_type,
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0, me->mnt_opts) < 0)
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fprintf(stderr, "mount: %s\n", strerror(errno));
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if(fp)
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endmntent(fp);
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}
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return EXIT_SUCCESS;
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opt = opthead;
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while (opt) {
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tmp = opt->next;
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free(opt->name);
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free(opt);
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opt = tmp;
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mountall:
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if(!(fp = setmntent("/etc/fstab", "r")))
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eprintf("setmntent %s:", "/etc/fstab");
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while((me = getmntent(fp))) {
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flags = 0;
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parseopts(me->mnt_opts, &flags, data, datasiz);
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if(mount(me->mnt_fsname, me->mnt_dir, me->mnt_type, flags, data) < 0)
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fprintf(stderr, "mount: %s\n", strerror(errno));
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}
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endmntent(fp);
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return EXIT_SUCCESS;
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}
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