lib/libzfs/os/freebsd/libzfs_zmount.c

   1 /*
   2  * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * This file implements Solaris compatible zmount() function.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/param.h>
  35 #include <sys/mount.h>
  36 #include <sys/uio.h>
  37 #include <sys/mntent.h>
  38 #include <assert.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <sys/mnttab.h>
  43 #include <sys/errno.h>
  44 #include <libzfs.h>
  45
  46 #include "../../libzfs_impl.h"
  47
  48 static void
  49 build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val,
  50     size_t len)
  51 {
  52         int i;
  53
  54         if (*iovlen < 0)
  55                 return;
  56         i = *iovlen;
  57         *iov = realloc(*iov, sizeof (**iov) * (i + 2));
  58         if (*iov == NULL) {
  59                 *iovlen = -1;
  60                 return;
  61         }
  62         (*iov)[i].iov_base = strdup(name);
  63         (*iov)[i].iov_len = strlen(name) + 1;
  64         i++;
  65         (*iov)[i].iov_base = val;
  66         if (len == (size_t)-1) {
  67                 if (val != NULL)
  68                         len = strlen(val) + 1;
  69                 else
  70                         len = 0;
  71         }
  72         (*iov)[i].iov_len = (int)len;
  73         *iovlen = ++i;
  74 }
  75
  76 static int
  77 do_mount_(const char *spec, const char *dir, int mflag, char *fstype,
  78     char *dataptr, int datalen, char *optptr, int optlen)
  79 {
  80         struct iovec *iov;
  81         char *optstr, *p, *tofree;
  82         int iovlen, rv;
  83
  84         assert(spec != NULL);
  85         assert(dir != NULL);
  86         assert(fstype != NULL);
  87         assert(strcmp(fstype, MNTTYPE_ZFS) == 0);
  88         assert(dataptr == NULL);
  89         assert(datalen == 0);
  90         assert(optptr != NULL);
  91         assert(optlen > 0);
  92
  93         tofree = optstr = strdup(optptr);
  94         assert(optstr != NULL);
  95
  96         iov = NULL;
  97         iovlen = 0;
  98         if (strstr(optstr, MNTOPT_REMOUNT) != NULL)
  99                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 100         if (mflag & MS_RDONLY)
 101                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 102         build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
 103         build_iovec(&iov, &iovlen, "fspath", __DECONST(char *, dir),
 104             (size_t)-1);
 105         build_iovec(&iov, &iovlen, "from", __DECONST(char *, spec), (size_t)-1);
 106         while ((p = strsep(&optstr, ",/")) != NULL)
 107                 build_iovec(&iov, &iovlen, p, NULL, (size_t)-1);
 108         rv = nmount(iov, iovlen, 0);
 109         free(tofree);
 110         if (rv < 0)
 111                 return (errno);
 112         return (rv);
 113 }
 114
 115 int
 116 do_mount(zfs_handle_t *zhp, const char *mntpt, char *opts, int flags)
 117 {
 118
 119         return (do_mount_(zfs_get_name(zhp), mntpt, flags, MNTTYPE_ZFS, NULL, 0,
 120             opts, sizeof (mntpt)));
 121 }
 122
 123 int
 124 do_unmount(const char *mntpt, int flags)
 125 {
 126         if (unmount(mntpt, flags) < 0)
 127                 return (errno);
 128         return (0);
 129 }
 130
 131 int
 132 zfs_mount_delegation_check(void)
 133 {
 134         return (0);
 135 }