Annotation of src/sbin/mount_puffs/mount_puffs.c, Revision 1.5
1.5 ! pho 1: /* $NetBSD: mount_puffs.c,v 1.4 2011/08/29 14:35:02 joerg Exp $ */
1.1 pooka 2:
3: /*
4: * Copyright (c) 2010 Antti Kantee. All Rights Reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: */
27:
28: /*
1.5 ! pho 29: * This is to support -o getargs without having to replicate it in
! 30: * every file server. It also allows puffs filesystems to be mounted
! 31: * via "mount -a".
1.1 pooka 32: */
33:
34: #include <sys/cdefs.h>
35: #ifndef lint
1.5 ! pho 36: __RCSID("$NetBSD: mount_puffs.c,v 1.4 2011/08/29 14:35:02 joerg Exp $");
1.1 pooka 37: #endif /* !lint */
38:
39: #include <sys/param.h>
40: #include <sys/mount.h>
41:
42: #include <fs/puffs/puffs_msgif.h>
43:
44: #include <err.h>
45: #include <stdio.h>
46: #include <stdlib.h>
1.5 ! pho 47: #include <string.h>
! 48: #include <sys/cdefs.h>
1.1 pooka 49: #include <unistd.h>
1.5 ! pho 50: #include <util.h>
1.1 pooka 51:
1.5 ! pho 52: static int
1.1 pooka 53: usage(void)
54: {
55:
1.5 ! pho 56: fprintf(stderr, "usage: %s [-o options] program[#source] mountpoint\n", getprogname());
! 57: return 1;
1.1 pooka 58: }
59:
1.5 ! pho 60: static int show_puffs_mount_args(const char *mountpoint)
1.1 pooka 61: {
62: const char *vtypes[] = { VNODE_TYPES };
63: struct puffs_kargs kargs;
64:
1.5 ! pho 65: if (mount(MOUNT_PUFFS, mountpoint, MNT_GETARGS, &kargs, sizeof(kargs)) == -1)
! 66: err(1, "mount");
1.1 pooka 67:
1.3 pooka 68: printf("version=%d, ", kargs.pa_vers);
1.1 pooka 69: printf("flags=0x%x, ", kargs.pa_flags);
70:
71: printf("root cookie=%p, ", kargs.pa_root_cookie);
72: printf("root type=%s", vtypes[kargs.pa_root_vtype]);
73:
74: if (kargs.pa_root_vtype != VDIR)
75: printf(", root size=%llu",
76: (unsigned long long)kargs.pa_root_vsize);
77: if (kargs.pa_root_vtype == VCHR || kargs.pa_root_vtype == VBLK)
78: printf(", root rdev=0x%" PRIx64, (uint64_t)kargs.pa_root_rdev);
79: printf("\n");
1.2 pooka 80:
81: return 0;
1.1 pooka 82: }
1.5 ! pho 83:
! 84: static int
! 85: mount_puffs_filesystem(const char *program, const char *opts,
! 86: const char *source, const char *mountpoint)
! 87: {
! 88: int argc = 0;
! 89: const char **argv;
! 90: int rv = 0;
! 91:
! 92: /* Construct an argument vector:
! 93: * program [-o opts] [source] mountpoint */
! 94: argv = ecalloc(1 + 2 + 1 + 1, sizeof(*argv));
! 95: argv[argc++] = program;
! 96: if (opts != NULL) {
! 97: argv[argc++] = "-o";
! 98: argv[argc++] = opts;
! 99: }
! 100: if (source != NULL) {
! 101: argv[argc++] = source;
! 102: }
! 103: argv[argc++] = mountpoint;
! 104: argv[argc] = NULL;
! 105:
! 106: /* We intentionally use execvp(3) here because the program can
! 107: * actually be a basename. */
! 108: if (execvp(program, __UNCONST(argv)) == -1) {
! 109: warn("Cannot execute %s", program);
! 110: rv = 1;
! 111: }
! 112:
! 113: free(argv);
! 114: return rv;
! 115: }
! 116:
! 117: static void add_opt(char **opts, const char *opt)
! 118: {
! 119: const size_t orig_len = *opts == NULL ? 0 : strlen(*opts);
! 120:
! 121: *opts = erealloc(*opts, orig_len + 1 + strlen(opt) + 1);
! 122:
! 123: if (orig_len == 0) {
! 124: strcpy(*opts, opt);
! 125: }
! 126: else {
! 127: strcat(*opts, ",");
! 128: strcat(*opts, opt);
! 129: }
! 130: }
! 131:
! 132: int
! 133: main(int argc, char *argv[])
! 134: {
! 135: int mntflags = 0;
! 136: int ch;
! 137: char *opts = NULL;
! 138: int rv = 0;
! 139:
! 140: while ((ch = getopt(argc, argv, "o:")) != -1) {
! 141: switch (ch) {
! 142: case 'o':
! 143: for (char *opt = optarg; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
! 144: if (strcmp(opt, "getargs") == 0) {
! 145: mntflags |= MNT_GETARGS;
! 146: break; /* No need to parse it any further. */
! 147: }
! 148: else {
! 149: add_opt(&opts, opt);
! 150: }
! 151: }
! 152: break;
! 153: default:
! 154: rv = usage();
! 155: goto free_opts;
! 156: }
! 157: }
! 158: argc -= optind;
! 159: argv += optind;
! 160:
! 161: if (argc != 2) {
! 162: rv = usage();
! 163: goto free_opts;
! 164: }
! 165:
! 166: if (mntflags & MNT_GETARGS) {
! 167: /* Special case for -o getargs: retrieve kernel arguments for
! 168: * an already mounted filesystem. */
! 169: rv = show_puffs_mount_args(argv[1]);
! 170: }
! 171: else {
! 172: /* Split the program name and source. This is to allow
! 173: * filesystems to be mounted via "mount -a" i.e. /etc/fstab */
! 174: char *source = argv[0];
! 175: char *program = strsep(&source, "#");
! 176:
! 177: rv = mount_puffs_filesystem(program, opts, source, argv[1]);
! 178: }
! 179:
! 180: free_opts:
! 181: free(opts);
! 182: return rv;
! 183: }
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