file_trunc.c

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    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 https://opensource.org/licenses/CDDL-1.0.
   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 /*
   23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   24  * Use is subject to license terms.
   25  */
   26 
   27 /*
   28  * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
   29  */
   30 
   31 #include <stdio.h>
   32 #include <stdlib.h>
   33 #include <unistd.h>
   34 #include <limits.h>
   35 #include <errno.h>
   36 #include <fcntl.h>
   37 #include <sys/types.h>
   38 #include <sys/stat.h>
   39 #include <sys/statvfs.h>
   40 #include <sys/time.h>
   41 #include <sys/ioctl.h>
   42 #include <sys/wait.h>
   43 #include <sys/param.h>
   44 #include <string.h>
   45 #include <time.h>
   46 #include <inttypes.h>
   47 
   48 #define FSIZE   256*1024*1024
   49 #define BSIZE   512
   50 
   51 /* Initialize Globals */
   52 static long     fsize = FSIZE;
   53 static size_t   bsize = BSIZE;
   54 static int      count = 0;
   55 static int      rflag = 0;
   56 static uint_t   seed = 0;
   57 static int      vflag = 0;
   58 static int      errflag = 0;
   59 static off_t    offset = 0;
   60 static char     *filename = NULL;
   61 
   62 static void usage(char *execname);
   63 static void parse_options(int argc, char *argv[]);
   64 static void do_write(int fd);
   65 static void do_trunc(int fd);
   66 
   67 static void
   68 usage(char *execname)
   69 {
   70         (void) fprintf(stderr,
   71             "usage: %s [-b blocksize] [-c count] [-f filesize]"
   72             " [-o offset] [-s seed] [-r] [-v] filename\n", execname);
   73         (void) exit(1);
   74 }
   75 
   76 int
   77 main(int argc, char *argv[])
   78 {
   79         int i = 0;
   80         int fd = -1;
   81 
   82         parse_options(argc, argv);
   83 
   84         fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
   85         if (fd < 0) {
   86                 perror("open");
   87                 exit(3);
   88         }
   89 
   90         for (i = 0; count == 0 || i < count; i++) {
   91                 (void) do_write(fd);
   92                 (void) do_trunc(fd);
   93         }
   94 
   95         (void) close(fd);
   96         return (0);
   97 }
   98 
   99 static void
  100 parse_options(int argc, char *argv[])
  101 {
  102         int c;
  103 
  104         extern char *optarg;
  105         extern int optind, optopt;
  106 
  107         count = fsize / bsize;
  108         seed = (uint_t)time(NULL);
  109         while ((c = getopt(argc, argv, "b:c:f:o:rs:v")) != -1) {
  110                 switch (c) {
  111                         case 'b':
  112                                 bsize = atoi(optarg);
  113                                 break;
  114 
  115                         case 'c':
  116                                 count = atoi(optarg);
  117                                 break;
  118 
  119                         case 'f':
  120                                 fsize = atoi(optarg);
  121                                 break;
  122 
  123                         case 'o':
  124                                 offset = atoi(optarg);
  125                                 break;
  126 
  127                         case 'r':
  128                                 rflag++;
  129                                 break;
  130 
  131                         case 's':
  132                                 seed = atoi(optarg);
  133                                 break;
  134 
  135                         case 'v':
  136                                 vflag++;
  137                                 break;
  138 
  139                         case ':':
  140                                 (void) fprintf(stderr,
  141                                     "Option -%c requires an operand\n", optopt);
  142                                 errflag++;
  143                                 break;
  144 
  145                         case '?':
  146                                 (void) fprintf(stderr,
  147                                     "Unrecognized option: -%c\n", optopt);
  148                                 errflag++;
  149                                 break;
  150                 }
  151 
  152                 if (errflag) {
  153                         (void) usage(argv[0]);
  154                 }
  155         }
  156         if (argc <= optind) {
  157                 (void) fprintf(stderr,
  158                     "No filename specified\n");
  159                 usage(argv[0]);
  160         }
  161         filename = argv[optind];
  162 
  163         if (vflag) {
  164                 (void) fprintf(stderr, "Seed = %d\n", seed);
  165         }
  166         srandom(seed);
  167 }
  168 
  169 static void
  170 do_write(int fd)
  171 {
  172         off_t   roffset = 0;
  173         char    *buf = NULL;
  174         char    *rbuf = NULL;
  175 
  176         buf = (char *)calloc(1, bsize);
  177         rbuf = (char *)calloc(1, bsize);
  178         if (buf == NULL || rbuf == NULL) {
  179                 perror("malloc");
  180                 exit(4);
  181         }
  182 
  183         roffset = random() % fsize;
  184         if (lseek64(fd, (offset + roffset), SEEK_SET) < 0) {
  185                 perror("lseek");
  186                 exit(5);
  187         }
  188 
  189         (void) strcpy(buf, "ZFS Test Suite Truncation Test");
  190         if (write(fd, buf, bsize) < bsize) {
  191                 perror("write");
  192                 exit(6);
  193         }
  194 
  195         if (rflag) {
  196                 if (lseek64(fd, (offset + roffset), SEEK_SET) < 0) {
  197                         perror("lseek");
  198                         exit(7);
  199                 }
  200 
  201                 if (read(fd, rbuf, bsize) < bsize) {
  202                         perror("read");
  203                         exit(8);
  204                 }
  205 
  206                 if (memcmp(buf, rbuf, bsize) != 0) {
  207                         perror("memcmp");
  208                         exit(9);
  209                 }
  210         }
  211         if (vflag) {
  212                 (void) fprintf(stderr,
  213                     "Wrote to offset %" PRId64 "\n", (offset + roffset));
  214                 if (rflag) {
  215                         (void) fprintf(stderr,
  216                             "Read back from offset %" PRId64 "\n",
  217                             (offset + roffset));
  218                 }
  219         }
  220 
  221         (void) free(buf);
  222         (void) free(rbuf);
  223 }
  224 
  225 static void
  226 do_trunc(int fd)
  227 {
  228         off_t   roffset = 0;
  229 
  230         roffset = random() % fsize;
  231         if (ftruncate64(fd, (offset + roffset))  < 0) {
  232                 perror("truncate");
  233                 exit(7);
  234         }
  235 
  236         if (vflag) {
  237                 (void) fprintf(stderr, "Truncated at offset %" PRId64 "\n",
  238                     (offset + roffset));
  239         }
  240 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/file/file_trunc.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/file/file_trunc.c