tests/zfs-tests/cmd/file/file_write.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 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 #include "file_common.h"
  28 #include <libgen.h>
  29 #include <string.h>
  30 #include <inttypes.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include <stdlib.h>
  34 #include <time.h>
  35 #include <stdint.h>
  36
  37 static unsigned char bigbuffer[BIGBUFFERSIZE];
  38
  39 /*
  40  * Writes (or appends) a given value to a file repeatedly.
  41  * See header file for defaults.
  42  */
  43
  44 static void usage(char *);
  45
  46 /*
  47  * pseudo-randomize the buffer
  48  */
  49 static void randomize_buffer(int block_size) {
  50         int i;
  51         char rnd = rand() & 0xff;
  52         for (i = 0; i < block_size; i++)
  53                 bigbuffer[i] ^= rnd;
  54 }
  55
  56 int
  57 main(int argc, char **argv)
  58 {
  59         int             bigfd;
  60         int             c;
  61         int             oflag = 0;
  62         int             err = 0;
  63         int             k;
  64         long            i;
  65         int64_t         good_writes = 0;
  66         uchar_t         nxtfillchar;
  67         char            *prog = argv[0];
  68         /*
  69          * Default Parameters
  70          */
  71         int             write_count = BIGFILESIZE;
  72         uchar_t         fillchar = DATA;
  73         int             block_size = BLOCKSZ;
  74         char            *filename = NULL;
  75         char            *operation = NULL;
  76         offset_t        noffset, offset = 0;
  77         int             verbose = 0;
  78         int             rsync = 0;
  79         int             wsync = 0;
  80
  81         /*
  82          * Process Arguments
  83          */
  84         while ((c = getopt(argc, argv, "b:c:d:s:f:o:vwr")) != -1) {
  85                 switch (c) {
  86                         case 'b':
  87                                 block_size = atoi(optarg);
  88                                 break;
  89                         case 'c':
  90                                 write_count = atoi(optarg);
  91                                 break;
  92                         case 'd':
  93                                 if (optarg[0] == 'R')
  94                                         fillchar = 'R'; /* R = random data */
  95                                 else
  96                                         fillchar = atoi(optarg);
  97                                 break;
  98                         case 's':
  99                                 offset = atoll(optarg);
 100                                 break;
 101                         case 'f':
 102                                 filename = optarg;
 103                                 break;
 104                         case 'o':
 105                                 operation = optarg;
 106                                 break;
 107                         case 'v':
 108                                 verbose = 1;
 109                                 break;
 110                         case 'w':
 111                                 wsync = 1;
 112                                 break;
 113                         case 'r':
 114                                 rsync = 1;
 115                                 break;
 116                         case '?':
 117                                 (void) printf("unknown arg %c\n", optopt);
 118                                 usage(prog);
 119                                 break;
 120                 }
 121         }
 122
 123         /*
 124          * Validate Parameters
 125          */
 126         if (!filename) {
 127                 (void) printf("Filename not specified (-f <file>)\n");
 128                 err++;
 129         }
 130
 131         if (!operation) {
 132                 (void) printf("Operation not specified (-o <operation>).\n");
 133                 err++;
 134         }
 135
 136         if (block_size > BIGBUFFERSIZE) {
 137                 (void) printf("block_size is too large max==%d.\n",
 138                     BIGBUFFERSIZE);
 139                 err++;
 140         }
 141
 142         if (err) {
 143                 usage(prog); /* no return */
 144                 return (1);
 145         }
 146
 147         /*
 148          * Prepare the buffer and determine the requested operation
 149          */
 150         nxtfillchar = fillchar;
 151         k = 0;
 152
 153         if (fillchar == 'R')
 154                 srand(time(NULL));
 155
 156         for (i = 0; i < block_size; i++) {
 157                 bigbuffer[i] = nxtfillchar;
 158
 159                 if (fillchar == 0) {
 160                         if ((k % DATA_RANGE) == 0) {
 161                                 k = 0;
 162                         }
 163                         nxtfillchar = k++;
 164                 } else if (fillchar == 'R') {
 165                         nxtfillchar = rand() & 0xff;
 166                 }
 167         }
 168
 169         /*
 170          * using the strncmp of operation will make the operation match the
 171          * first shortest match - as the operations are unique from the first
 172          * character this means that we match single character operations
 173          */
 174         if ((strncmp(operation, "create", strlen(operation) + 1)) == 0 ||
 175             (strncmp(operation, "overwrite", strlen(operation) + 1)) == 0) {
 176                 oflag = (O_RDWR|O_CREAT);
 177         } else if ((strncmp(operation, "append", strlen(operation) + 1)) == 0) {
 178                 oflag = (O_RDWR|O_APPEND);
 179         } else {
 180                 (void) printf("valid operations are <create|append> not '%s'\n",
 181                     operation);
 182                 usage(prog);
 183         }
 184
 185         if (rsync) {
 186                 oflag = oflag | O_RSYNC;
 187         }
 188
 189         if (wsync) {
 190                 oflag = oflag | O_SYNC;
 191         }
 192
 193         /*
 194          * Given an operation (create/overwrite/append), open the file
 195          * accordingly and perform a write of the appropriate type.
 196          */
 197         if ((bigfd = open(filename, oflag, 0666)) == -1) {
 198                 (void) printf("open %s: failed [%s]%d. Aborting!\n", filename,
 199                     strerror(errno), errno);
 200                 exit(errno);
 201         }
 202         noffset = lseek64(bigfd, offset, SEEK_SET);
 203         if (noffset != offset) {
 204                 (void) printf("llseek %s (%lld/%lld) failed [%s]%d.Aborting!\n",
 205                     filename, offset, noffset, strerror(errno), errno);
 206                 exit(errno);
 207         }
 208
 209         if (verbose) {
 210                 (void) printf("%s: block_size = %d, write_count = %d, "
 211                     "offset = %lld, ", filename, block_size,
 212                     write_count, offset);
 213                 if (fillchar == 'R') {
 214                         (void) printf("data = [random]\n");
 215                 } else {
 216                         (void) printf("data = %s%d\n",
 217                             (fillchar == 0) ? "0->" : "",
 218                             (fillchar == 0) ? DATA_RANGE : fillchar);
 219                 }
 220         }
 221
 222         for (i = 0; i < write_count; i++) {
 223                 ssize_t n;
 224                 if (fillchar == 'R')
 225                         randomize_buffer(block_size);
 226
 227                 if ((n = write(bigfd, &bigbuffer, block_size)) == -1) {
 228                         (void) printf("write failed (%ld), good_writes = %"
 229                             PRId64 ", " "error: %s[%d]\n",
 230                             (long)n, good_writes,
 231                             strerror(errno),
 232                             errno);
 233                         exit(errno);
 234                 }
 235                 good_writes++;
 236         }
 237
 238         if (verbose) {
 239                 (void) printf("Success: good_writes = %" PRId64 "(%"
 240                     PRId64 ")\n", good_writes, (good_writes * block_size));
 241         }
 242
 243         return (0);
 244 }
 245
 246 static void
 247 usage(char *prog)
 248 {
 249         (void) printf("Usage: %s [-v] -o {create,overwrite,append} -f file_name"
 250             " [-b block_size]\n"
 251             "\t[-s offset] [-c write_count] [-d data]\n\n"
 252             "Where [data] equal to zero causes chars "
 253             "0->%d to be repeated throughout, or [data]\n"
 254             "equal to 'R' for pseudorandom data.\n",
 255             prog, DATA_RANGE);
 256
 257         exit(1);
 258 }