Initial revision
This commit is contained in:
Eric Andersen
430
util-linux/mount.c
Normal file
430
util-linux/mount.c
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@ -0,0 +1,430 @@
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/*
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3/21/1999 Charles P. Wright <cpwright@cpwright.com>
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searches through fstab when -a is passed
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will try mounting stuff with all fses when passed -t auto
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1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
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*/
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#include "internal.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <mntent.h>
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#include <sys/mount.h>
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#include <ctype.h>
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const char mount_usage[] = "mount\n"
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"\t\tmount [flags] special-device directory\n"
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"\n"
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"Flags:\n"
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"\t-a:\tMount all file systems in fstab.\n"
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\t"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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struct mount_options {
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const char * name;
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unsigned long and;
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unsigned long or;
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};
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static const struct mount_options mount_options[] = {
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{ "async", ~MS_SYNCHRONOUS,0 },
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{ "defaults", ~0, 0 },
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{ "dev", ~MS_NODEV, 0 },
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{ "exec", ~MS_NOEXEC, 0 },
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{ "nodev", ~0, MS_NODEV },
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{ "noexec", ~0, MS_NOEXEC },
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{ "nosuid", ~0, MS_NOSUID },
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{ "remount", ~0, MS_REMOUNT },
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{ "ro", ~0, MS_RDONLY },
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{ "rw", ~MS_RDONLY, 0 },
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{ "suid", ~MS_NOSUID, 0 },
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{ "sync", ~0, MS_SYNCHRONOUS },
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{ 0, 0, 0 }
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};
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static void
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show_flags(unsigned long flags, char * buffer)
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{
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const struct mount_options * f = mount_options;
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while ( f->name ) {
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if ( flags & f->and ) {
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int length = strlen(f->name);
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memcpy(buffer, f->name, length);
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buffer += length;
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*buffer++ = ',';
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*buffer = '\0';
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}
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f++;
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}
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}
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static void
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one_option(
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char * option
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,unsigned long * flags
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,char * data)
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{
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const struct mount_options * f = mount_options;
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while ( f->name != 0 ) {
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if ( strcasecmp(f->name, option) == 0 ) {
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*flags &= f->and;
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*flags |= f->or;
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return;
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}
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f++;
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}
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if ( *data ) {
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data += strlen(data);
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*data++ = ',';
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}
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strcpy(data, option);
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}
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static void
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parse_mount_options(
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char * options
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,unsigned long * flags
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,char * data)
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{
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while ( *options ) {
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char * comma = strchr(options, ',');
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if ( comma )
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*comma = '\0';
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one_option(options, flags, data);
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if ( comma ) {
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*comma = ',';
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options = ++comma;
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}
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else
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break;
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}
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}
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int
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mount_one(
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char * blockDevice
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,char * directory
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,char * filesystemType
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,unsigned long flags
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,char * string_flags
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,int noMtab
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,int fake)
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{
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int error = 0;
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int status = 0;
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char buf[255];
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if (!fake) {
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if (*filesystemType == 'a') { //Will fail on real FS starting with 'a'
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FILE *f = fopen("/proc/filesystems", "r");
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if (f == NULL) return 1;
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while (fgets(buf, sizeof(buf), f) != NULL) {
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filesystemType = buf;
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if (*filesystemType == '\t') { // Not a nodev filesystem
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while (*filesystemType && *filesystemType != '\n') filesystemType++;
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*filesystemType = '\0';
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filesystemType = buf;
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filesystemType++; //hop past tab
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status = mount(blockDevice, directory, filesystemType,
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flags|MS_MGC_VAL ,string_flags);
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error = errno;
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if (status == 0) break;
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}
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}
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fclose(f);
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} else {
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status = mount( blockDevice, directory, filesystemType,
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flags|MS_MGC_VAL ,string_flags);
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error = errno;
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}
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}
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if ( status == 0 ) {
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char * s = &string_flags[strlen(string_flags)];
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FILE * mountTable;
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if ( s != string_flags ) {
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*s++ = ',';
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show_flags(flags, s);
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}
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if ( !noMtab && (mountTable = setmntent("/etc/mtab", "a+")) ) {
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int length = strlen(directory);
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struct mntent m;
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if ( length > 1 && directory[length - 1] == '/' )
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directory[length - 1] = '\0';
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if ( filesystemType == 0 ) {
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struct mntent * p
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= findMountPoint(blockDevice, "/proc/mounts");
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if ( p && p->mnt_type )
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filesystemType = p->mnt_type;
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}
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m.mnt_fsname = blockDevice;
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m.mnt_dir = directory;
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m.mnt_type = filesystemType ? filesystemType : "default";
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if (*string_flags) {
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m.mnt_opts = string_flags;
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} else {
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if ( (flags | MS_RDONLY) == flags )
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m.mnt_opts = "ro";
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else
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m.mnt_opts = "rw";
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}
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m.mnt_freq = 0;
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m.mnt_passno = 0;
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addmntent(mountTable, &m);
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endmntent(mountTable);
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}
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return 0;
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} else {
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fprintf(stderr, "Mount %s", blockDevice);
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if ( filesystemType && *filesystemType )
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fprintf(stderr, " (type %s)", filesystemType);
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fprintf(
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stderr
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," on %s: "
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,directory);
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switch ( error ) {
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case EPERM:
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if (geteuid() == 0)
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fprintf(
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stderr
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,"mount point %s is not a directory"
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,blockDevice);
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else
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fprintf(
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stderr
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,"must be superuser to use mount");
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break;
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case EBUSY:
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fprintf(
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stderr
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,"%s already mounted or %s busy"
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,blockDevice
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,directory);
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break;
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case ENOENT:
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{
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struct stat statbuf;
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if ( stat(directory, &statbuf) != 0 )
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fprintf(
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stderr
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,"directory %s does not exist"
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,directory);
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else if ( stat(blockDevice, &statbuf) != 0 )
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fprintf(
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stderr
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,"block device %s does not exist"
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,blockDevice);
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else
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fprintf(
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stderr
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,"%s is not mounted on %s, but the mount table says it is."
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,blockDevice
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,directory);
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break;
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}
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case ENOTDIR:
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fprintf(
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stderr
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,"%s is not a directory"
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,directory);
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break;
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case EINVAL:
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fprintf(
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stderr
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,"wrong filesystem type, or bad superblock on %s"
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,blockDevice);
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break;
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case EMFILE:
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fprintf(stderr, "mount table full");
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break;
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case EIO:
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fprintf(
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stderr
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,"I/O error reading %s"
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,blockDevice);
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break;
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case ENODEV:
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{
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FILE * f = fopen("/proc/filesystems", "r");
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fprintf(
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stderr
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,"filesystem type %s not in kernel.\n"
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,filesystemType);
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fprintf(stderr, "Do you need to load a module?\n");
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if ( f ) {
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char buf[100];
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fprintf(
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stderr
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,"Here are the filesystem types the kernel"
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" can mount:\n");
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while ( fgets(buf, sizeof(buf), f) != 0 )
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fprintf(stderr, "\t%s", buf);
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fclose(f);
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}
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break;
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}
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case ENOTBLK:
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fprintf(
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stderr
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,"%s is not a block device"
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,blockDevice);
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break;
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case ENXIO:
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fprintf(
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stderr
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,"%s is not a valid block device"
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,blockDevice);
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break;
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default:
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fputs(strerror(errno), stderr);
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}
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putc('\n', stderr);
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return -1;
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}
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}
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extern int
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mount_main(struct FileInfo * i, int argc, char * * argv)
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{
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char string_flags[1024];
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unsigned long flags = 0;
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char * filesystemType = "auto";
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int fake = 0;
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int noMtab = 0;
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int all = 0;
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*string_flags = '\0';
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if ( argc == 1 ) {
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FILE * mountTable;
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if ( (mountTable = setmntent("/etc/mtab", "r")) ) {
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struct mntent * m;
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while ( (m = getmntent(mountTable)) != 0 ) {
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printf(
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"%s on %s type %s (%s)\n"
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,m->mnt_fsname
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,m->mnt_dir
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,m->mnt_type
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,m->mnt_opts);
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}
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endmntent(mountTable);
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}
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return 0;
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}
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while ( argc >= 2 && argv[1][0] == '-' ) {
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switch ( argv[1][1] ) {
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case 'f':
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fake = 1;
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break;
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case 'n':
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noMtab = 1;
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break;
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case 'o':
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if ( argc < 3 ) {
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usage(mount_usage);
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return 1;
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}
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parse_mount_options(argv[2], &flags, string_flags);
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argc--;
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argv++;
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break;
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case 'r':
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flags |= MS_RDONLY;
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break;
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case 't':
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if ( argc < 3 ) {
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usage(mount_usage);
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return 1;
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}
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filesystemType = argv[2];
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argc--;
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argv++;
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break;
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case 'v':
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break;
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case 'w':
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flags &= ~MS_RDONLY;
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break;
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case 'a':
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all = 1;
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break;
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default:
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usage(mount_usage);
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return 1;
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}
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argc--;
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argv++;
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}
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if (all == 1) {
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struct mntent *m;
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FILE *f = setmntent("/etc/fstab", "r");
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if (f == NULL) {
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return 1;
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}
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// FIXME: Combine read routine (make new function) with unmount_all to save space.
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while ((m = getmntent(f)) != NULL) {
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// If the file system isn't noauto, and isn't mounted on /, mount it
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if ((!strstr(m->mnt_opts, "noauto")) && (m->mnt_dir[1] != '\0')
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&& !((m->mnt_type[0] == 's') && (m->mnt_type[1] == 'w'))
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&& !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
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mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type, flags, m->mnt_opts, noMtab, fake);
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}
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}
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endmntent(f);
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} else {
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if ( argc >= 3 ) {
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if ( mount_one( argv[1], argv[2], filesystemType, flags, string_flags, noMtab, fake) == 0 )
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return 0;
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else
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return 1;
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} else {
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usage(mount_usage);
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return 1;
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}
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}
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return 0;
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}
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