usr/src/lib/lvm/libsvm/common/metaconf.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <sys/types.h>
  29 #include <sys/mkdev.h>
  30 #include <sys/stat.h>
  31 #include <unistd.h>
  32 #include <dirent.h>
  33 #include <limits.h>
  34 #include <string.h>
  35 #include <libsvm.h>
  36 #include <svm.h>
  37 #include <errno.h>
  38
  39
  40 #define VERSION "1.0"
  41 #define DISK_DIR "/dev/rdsk"
  42
  43 extern int _map_to_effective_dev();
  44
  45 static int is_blank(char *);
  46
  47 /*
  48  * is_blank() returns 1 (true) if a line specified is composed of
  49  * whitespace characters only. otherwise, it returns 0 (false).
  50  *
  51  * Note. the argument (line) must be null-terminated.
  52  */
  53 static int
  54 is_blank(char *line)
  55 {
  56         for (/* nothing */; *line != '\0'; line++)
  57                 if (!isspace(*line))
  58                         return (0);
  59         return (1);
  60 }
  61
  62 /*
  63  * FUNCTION: write_targ_nm_table
  64  *      creates a tuple table of <driver name, major number > in md.conf
  65  * INPUT: rootpath
  66  *
  67  * RETURN VALUES:
  68  *      RET_SUCCESS
  69  *      RET_ERROR
  70  */
  71
  72 int
  73 write_targ_nm_table(char *path)
  74 {
  75         FILE    *targfp = NULL;
  76         FILE    *mdfp = NULL;
  77         char    buf[PATH_MAX], *cp;
  78         int     retval = RET_SUCCESS;
  79         int     first_entry = 1;
  80
  81         if ((mdfp = fopen(MD_CONF, "a")) == NULL)
  82                 return (RET_ERROR);
  83
  84         (void) snprintf(buf, sizeof (buf), "%s%s", path, NAME_TO_MAJOR);
  85
  86         if ((targfp = fopen(buf, "r")) == NULL) {
  87                 (void) fclose(mdfp);
  88                 return (RET_ERROR);
  89         }
  90
  91         while (fgets(buf, PATH_MAX, targfp) != NULL &&
  92             (retval == RET_SUCCESS)) {
  93                 /* remove a new-line character for md_targ_nm_table */
  94                 if ((cp = strchr(buf, '\n')) != NULL)
  95                         *cp = 0;
  96                 /* cut off comments starting with '#' */
  97                 if ((cp = strchr(buf, '#')) != NULL)
  98                         *cp = 0;
  99                 /* ignore comment or blank lines */
 100                 if (is_blank(buf))
 101                         continue;
 102                 if (first_entry) {
 103                         if (fprintf(mdfp, "md_targ_nm_table=\"%s\"", buf) < 0)
 104                                 retval = RET_ERROR;
 105                         first_entry = 0;
 106                 } else {
 107                         if (fprintf(mdfp, ",\"%s\"", buf) < 0)
 108                                         retval = RET_ERROR;
 109                 }
 110         }
 111         if (!first_entry)
 112                 if (fprintf(mdfp, ";\n") < 0)
 113                         retval = RET_ERROR;
 114         (void) fclose(mdfp);
 115         (void) fclose(targfp);
 116         return (retval);
 117 }
 118
 119 /*
 120  * FUNCTION: write_xlate_to_mdconf
 121  *      creates a tuple table of <miniroot devt, target devt> in md.conf
 122  * INPUT: rootpath
 123  *
 124  * RETURN VALUES:
 125  *      RET_SUCCESS
 126  *      RET_ERROR
 127  */
 128
 129 int
 130 write_xlate_to_mdconf(char *path)
 131 {
 132         FILE            *fptr = NULL;
 133         struct dirent   *dp;
 134         DIR             *dirp;
 135         struct stat     statb_dev;
 136         struct stat     statb_edev;
 137         char            *devname;
 138         char            edevname[PATH_MAX];
 139         char            targname[PATH_MAX];
 140         char            diskdir[PATH_MAX];
 141         char            linkpath[PATH_MAX];
 142         int             first_devid = 1;
 143         int             ret = RET_SUCCESS;
 144
 145         if ((fptr = fopen(MD_CONF, "a")) == NULL) {
 146                 return (RET_ERROR);
 147         }
 148
 149
 150         (void) snprintf(diskdir, sizeof (diskdir), "%s%s", path, DISK_DIR);
 151         if ((dirp = opendir(diskdir)) == NULL) {
 152                 (void) fclose(fptr);
 153                 return (RET_ERROR);
 154         }
 155
 156         /* special case to write the first tuple in the table */
 157         while (((dp = readdir(dirp)) != (struct dirent *)0) &&
 158             (ret != RET_ERROR)) {
 159                 if ((strcmp(dp->d_name, ".") == 0) ||
 160                     (strcmp(dp->d_name, "..") == 0))
 161                         continue;
 162
 163                 if ((strlen(diskdir) + strlen(dp->d_name) + 2) > PATH_MAX) {
 164                         continue;
 165                 }
 166
 167                 (void) snprintf(targname, sizeof (targname), "%s/%s",
 168                     diskdir, dp->d_name);
 169
 170                 /*
 171                  * stat /devices to see if it's a devfs based file system
 172                  * On Solaris 10 and up, the devfs has been built on the
 173                  * fly for the mini-root. We need to adjust the path
 174                  * accordingly.
 175                  * If it's not devfs, just use the targname as it is.
 176                  */
 177
 178                 if (stat("/devices", &statb_dev) != 0) {
 179                         continue;
 180                 }
 181
 182                 if (strncmp("devfs", statb_dev.st_fstype, 5) == 0) {
 183                         if (readlink(targname, linkpath,
 184                             sizeof (linkpath)) == -1) {
 185                                 continue;
 186                         }
 187                         /*
 188                          * turn ../../devices/<path> into /devices/<path>
 189                          * and stat that into statb_dev
 190                          */
 191                         if (stat(strstr(linkpath, "/devices"),
 192                             &statb_dev) != 0) {
 193                                 continue;
 194                         }
 195                 } else {
 196                         if (stat(targname, &statb_dev) != 0) {
 197                                 continue;
 198                         }
 199                 }
 200
 201                 if ((devname = strstr(targname, DISK_DIR)) == NULL) {
 202                         continue;
 203                 }
 204
 205                 if (_map_to_effective_dev((char *)devname, (char *)&edevname)
 206                     != 0) {
 207                         continue;
 208                 }
 209
 210                 if (stat(edevname, &statb_edev) != 0) {
 211                         continue;
 212                 }
 213
 214                 if (first_devid) {
 215                         if (fprintf(fptr, "md_xlate_ver=\"%s\";\n"
 216                             "md_xlate=%lu,%lu", VERSION,
 217                             statb_edev.st_rdev, statb_dev.st_rdev) < 0)
 218                                 ret = RET_ERROR;
 219                         first_devid = 0;
 220                 }
 221                 if (fprintf(fptr, ",%lu,%lu", statb_edev.st_rdev,
 222                     statb_dev.st_rdev) < 0)
 223                         ret = RET_ERROR;
 224         } /* end while */
 225
 226         if (!first_devid)
 227                 if (fprintf(fptr, ";\n") < 0)
 228                         ret = RET_ERROR;
 229         (void) fclose(fptr);
 230         (void) closedir(dirp);
 231         return (ret);
 232 }