1 /* $NetBSD: mtab_aix.c,v 1.1.1.2 2009/03/20 20:26:50 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/conf/mtab/mtab_aix.c 43 * 44 */ 45 46 /* 47 * AIX systems don't write their mount tables on a file. Instead, they 48 * use a (better) system where the kernel keeps this state, and you access 49 * the mount tables via a known interface. 50 */ 51 52 #ifdef HAVE_CONFIG_H 53 # include <config.h> 54 #endif /* HAVE_CONFIG_H */ 55 #include <am_defs.h> 56 #include <amu.h> 57 58 /* 59 * These were missing external definitions from old AIX's headers. They 60 * appear to be available in <sys/vmount.h> on AIX 5.3, and possibly 61 * earlier. Hence I commented this out. 62 */ 63 #ifndef HAVE_EXTERN_MNTCTL 64 extern int mntctl(int cmd, int size, voidp buf); 65 #endif /* not HAVE_EXTERN_MNTCTL */ 66 67 68 static mntent_t * 69 mnt_dup(struct vmount *mp) 70 { 71 mntent_t *new_mp = ALLOC(mntent_t); 72 char *ty; 73 char *fsname = strdup(vmt2dataptr(mp, VMT_OBJECT)); 74 75 new_mp->mnt_dir = strdup(vmt2dataptr(mp, VMT_STUB)); 76 new_mp->mnt_opts = strdup(vmt2dataptr(mp, VMT_ARGS)); 77 78 switch (mp->vmt_gfstype) { 79 80 case MOUNT_TYPE_UFS: 81 ty = MNTTAB_TYPE_UFS; 82 new_mp->mnt_fsname = strdup(fsname); 83 break; 84 85 case MOUNT_TYPE_NFS: 86 ty = MNTTAB_TYPE_NFS; 87 new_mp->mnt_fsname = str3cat((char *) NULL, 88 vmt2dataptr(mp, VMT_HOSTNAME), ":", 89 fsname); 90 break; 91 92 #ifdef HAVE_FS_NFS3 93 case MOUNT_TYPE_NFS3: 94 ty = MNTTAB_TYPE_NFS3; 95 new_mp->mnt_fsname = str3cat((char *) NULL, 96 vmt2dataptr(mp, VMT_HOSTNAME), ":", 97 fsname); 98 break; 99 #endif /* HAVE_FS_NFS3 */ 100 101 default: 102 ty = "unknown"; 103 new_mp->mnt_fsname = strdup(fsname); 104 break; 105 106 } 107 108 new_mp->mnt_type = strdup(ty); 109 /* store the VFS ID for uvmount() */ 110 new_mp->mnt_passno = mp->vmt_vfsnumber; 111 new_mp->mnt_freq = 0; 112 113 XFREE(fsname); 114 115 return new_mp; 116 } 117 118 119 /* 120 * Read a mount table into memory 121 */ 122 mntlist * 123 read_mtab(char *fs, const char *mnttabname) 124 { 125 mntlist **mpp, *mhp; 126 int i; 127 char *mntinfo = NULL, *cp; 128 struct vmount *vp; 129 int ret; 130 int maxtry = 10; /* maximum number of times to try mntctl */ 131 132 /* 133 * Figure out size of mount table and allocate space for a copy. Then get 134 * mount table for real. We repeat this loop at most 10 times to minimze 135 * the chance of a race condition (something gets un/mounted in between 136 * calls to mntctl() 137 */ 138 i = sizeof(int); 139 do { 140 if (mntinfo) 141 XFREE(mntinfo); 142 mntinfo = xmalloc(i); 143 ret = mntctl(MCTL_QUERY, i, mntinfo); 144 if (ret == 0) 145 i = *(int*) mntinfo; 146 if (--maxtry <= 0) { 147 plog(XLOG_ERROR, "mntctl: could not get a stable result"); 148 ret = -1; 149 errno = EINVAL; 150 break; 151 } 152 } while (ret == 0); 153 if (ret < 0) { 154 plog(XLOG_ERROR, "mntctl: %m"); 155 goto out; 156 } 157 158 mpp = &mhp; 159 for (i = 0, cp = mntinfo; i < ret; i++, cp += vp->vmt_length) { 160 vp = (struct vmount *) cp; 161 162 /* 163 * Allocate a new slot 164 */ 165 *mpp = ALLOC(struct mntlist); 166 167 /* 168 * Copy the data returned by mntctl 169 */ 170 (*mpp)->mnt = mnt_dup(vp); 171 172 /* 173 * Move to next pointer 174 */ 175 mpp = &(*mpp)->mnext; 176 } 177 178 *mpp = NULL; 179 180 out: 181 if (mntinfo) 182 XFREE(mntinfo); 183 return mhp; 184 } 185