145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
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#include <lib.h>
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#define mount _mount
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#define umount _umount
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#include <string.h>
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#include <sys/mount.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <minix/syslib.h>
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#include <minix/rs.h>
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#include <minix/paths.h>
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#define OK 0
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#define FSPATH "/sbin/"
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#define FSDEFAULT "mfs"
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PRIVATE int rs_down(char *label)
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{
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char cmd[200];
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if(strlen(_PATH_SERVICE)+strlen(label)+50 >= sizeof(cmd))
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return -1;
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sprintf(cmd, _PATH_SERVICE " down '%s'", label);
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return system(cmd);
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}
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PUBLIC int mount(special, name, mountflags, type, args)
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char *name, *special, *type, *args;
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int mountflags;
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{
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int r;
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message m;
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struct stat statbuf;
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char label[16];
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char path[60];
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char cmd[200];
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char *p;
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int reuse;
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/* Default values. */
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if (type == NULL) type = FSDEFAULT;
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if (args == NULL) args = "";
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reuse = 0;
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/* Check mount flags */
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if(mountflags & MS_REUSE) {
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reuse = 1;
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mountflags &= ~MS_REUSE; /* Temporary: turn off to not confuse VFS */
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}
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/* Make a label for the file system process. This label must be unique and
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* may currently not exceed 16 characters including terminating null. For
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* requests with an associated block device, we use the last path component
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* name of the block special file (truncated to 12 characters, which is
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* hopefully enough). For requests with no associated block device, we use
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* the device number and inode of the mount point, in hexadecimal form.
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*/
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if (special) {
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p = strrchr(special, '/');
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p = p ? p + 1 : special;
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if (strchr(p, '\'')) {
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errno = EINVAL;
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return -1;
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}
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sprintf(label, "fs_%.12s", p);
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} else {
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if (stat(name, &statbuf) < 0) return -1;
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sprintf(label, "fs_%04x%lx", statbuf.st_dev, statbuf.st_ino);
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}
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/* Tell VFS that we are passing in a 16-byte label. */
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mountflags |= MS_LABEL16;
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/* See if the given type is even remotely valid. */
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if(strlen(FSPATH)+strlen(type) >= sizeof(path)) {
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errno = E2BIG;
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return -1;
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}
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strcpy(path, FSPATH);
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strcat(path, type);
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if(stat(path, &statbuf) != 0) {
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errno = EINVAL;
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return -1;
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}
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/* Sanity check on user input. */
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if(strchr(args, '\'')) {
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errno = EINVAL;
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return -1;
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}
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if(strlen(_PATH_SERVICE)+strlen(path)+strlen(label)+
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strlen(args)+50 >= sizeof(cmd)) {
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errno = E2BIG;
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return -1;
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}
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sprintf(cmd, _PATH_SERVICE " %sup %s -label '%s' -args '%s%s'",
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reuse ? "-r ": "", path, label, args[0] ? "-o " : "", args);
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if((r = system(cmd)) != 0) {
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fprintf(stderr, "mount: couldn't run %s\n", cmd);
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errno = r;
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return -1;
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}
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/* Now perform mount(). */
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m.m1_i1 = special ? strlen(special) + 1 : 0;
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m.m1_i2 = strlen(name) + 1;
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m.m1_i3 = mountflags;
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m.m1_p1 = special;
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m.m1_p2 = name;
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m.m1_p3 = label;
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r = _syscall(VFS_PROC_NR, MOUNT, &m);
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if(r != OK) {
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/* If mount() failed, tell RS to shutdown MFS process.
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* No error check - won't do anything with this error anyway.
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*/
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rs_down(label);
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}
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return r;
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}
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PUBLIC int umount(name)
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_CONST char *name;
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{
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message m;
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int r;
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_loadname(name, &m);
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r = _syscall(VFS_PROC_NR, UMOUNT, &m);
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if(r == OK) {
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/* VFS returns the label of the unmounted file system in the reply.
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* As of writing, the size of the m3_ca1 field is 16 bytes.
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*/
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rs_down(m.m3_ca1);
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}
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return r;
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}
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