tests/cases/test-throttled-io.c

   1 #include <sys/fcntl.h>
   2 #include <unistd.h>
   3 #include <stdlib.h>
   4 #include <sys/resource.h>
   5 #include <CommonCrypto/CommonDigest.h>
   6 #include <stdbool.h>
   7 #include <stdio.h>
   8 #include <spawn.h>
   9 #include <string.h>
  10 #include <signal.h>
  11 #include <stdarg.h>
  12 #include <sys/errno.h>
  13 #include <libkern/OSAtomic.h>
  14 #include <zlib.h>
  15 #include <pthread.h>
  16
  17 #include "hfs-tests.h"
  18 #include "test-utils.h"
  19 #include "disk-image.h"
  20
  21 TEST(throttled_io)
  22
  23 static disk_image_t *gDI;
  24 static char *gFile1, *gFile2, *gFile3;
  25
  26 static pid_t gPID = 0;
  27 static void *gBuf;
  28 static const size_t gBuf_size = 64 * 1024 * 1024;
  29
  30 static void start_background_io(void)
  31 {
  32         char *of;
  33         asprintf(&of, "of=%s", gFile1);
  34
  35         assert_no_err(posix_spawn(&gPID, "/bin/dd", NULL, NULL,
  36                                                           (char *[]){ "/bin/dd", "if=/dev/random",
  37                                                                   of, NULL },
  38                                                           NULL));
  39 }
  40
  41 static void end_background_io(void)
  42 {
  43         if ( gPID != 0 )
  44         {
  45                 kill(gPID, SIGKILL);
  46                 int stat;
  47                 wait(&stat);
  48                 gPID = 0;
  49         }
  50 }
  51
  52 static int run_test1(void)
  53 {
  54
  55         // Kick off another process to ensure we get throttled
  56         start_background_io();
  57
  58         assert_no_err(setiopolicy_np(IOPOL_TYPE_DISK, IOPOL_SCOPE_PROCESS,
  59                                                                  IOPOL_THROTTLE));
  60
  61         int fd, fd2;
  62         assert_with_errno((fd = open("/dev/random", O_RDONLY)) >= 0);
  63         assert_with_errno((fd2 = open(gFile2,
  64                                                                   O_RDWR | O_CREAT | O_TRUNC, 0666)) >= 0);
  65
  66         assert_no_err(fcntl(fd2, F_SINGLE_WRITER, 1));
  67         assert_no_err(fcntl(fd2, F_NOCACHE, 1));
  68
  69         gBuf = valloc(gBuf_size);
  70         CC_SHA1_CTX ctx;
  71         CC_SHA1_Init(&ctx);
  72
  73         ssize_t res = check_io(read(fd, gBuf, gBuf_size), gBuf_size);
  74
  75         CC_SHA1_Update(&ctx, gBuf, (CC_LONG)res);
  76
  77         res = check_io(write(fd2, gBuf, res), res);
  78
  79         bzero(gBuf, gBuf_size);
  80
  81         CC_SHA1_CTX ctx2;
  82         CC_SHA1_Init(&ctx2);
  83
  84         lseek(fd2, 0, SEEK_SET);
  85
  86         res = check_io(read(fd2, gBuf, gBuf_size), gBuf_size);
  87
  88         CC_SHA1_Update(&ctx2, gBuf, (CC_LONG)res);
  89
  90         uint8_t digest1[CC_SHA1_DIGEST_LENGTH], digest2[CC_SHA1_DIGEST_LENGTH];
  91         CC_SHA1_Final(digest1, &ctx);
  92         CC_SHA1_Final(digest2, &ctx2);
  93
  94         assert(!memcmp(digest1, digest2, CC_SHA1_DIGEST_LENGTH));
  95
  96         assert_no_err (close(fd));
  97         assert_no_err (close(fd2));
  98
  99         end_background_io();
 100
 101         return 0;
 102 }
 103
 104 static volatile uint64_t written;
 105 static volatile bool done;
 106
 107 static void test2_thread(void)
 108 {
 109         int fd = open(gFile3, O_RDONLY);
 110         assert(fd >= 0);
 111
 112         void *b = gBuf + gBuf_size / 2;
 113         uLong seq = crc32(0, Z_NULL, 0);
 114         uint32_t offset = 0;
 115
 116         do {
 117                 ssize_t res;
 118
 119                 do {
 120                         res = check_io(pread(fd, b, gBuf_size / 2, offset), -1);
 121                 } while (res == 0 && !done);
 122
 123                 assert (res % 4 == 0);
 124
 125                 offset += res;
 126
 127                 for (uLong *p = b; res; ++p, res -= sizeof(uLong)) {
 128                         seq = crc32(Z_NULL, (void *)&seq, 4);
 129                         assert(*p == seq);
 130                 }
 131
 132                 if (offset < written)
 133                         continue;
 134                 OSMemoryBarrier();
 135         } while (!done);
 136
 137         assert_no_err (close(fd));
 138
 139 }
 140
 141 static int run_test2(void)
 142 {
 143         start_background_io();
 144
 145         int fd = open(gFile3, O_RDWR | O_CREAT | O_TRUNC, 0666);
 146         assert(fd >= 0);
 147
 148         assert_no_err(fcntl(fd, F_SINGLE_WRITER, 1));
 149         assert_no_err(fcntl(fd, F_NOCACHE, 1));
 150
 151         pthread_t thread;
 152         pthread_create(&thread, NULL, (void *(*)(void *))test2_thread, NULL);
 153         uLong seq = crc32(0, Z_NULL, 0);
 154
 155         for (int i = 0; i < 4; ++i) {
 156                 uLong *p = gBuf;
 157                 for (unsigned i = 0; i < gBuf_size / 2 / sizeof(uLong); ++i) {
 158                         seq = crc32(Z_NULL, (void *)&seq, 4);
 159                         p[i] = seq;
 160                 }
 161
 162                 ssize_t res = check_io(write(fd, gBuf, gBuf_size / 2), gBuf_size / 2);
 163
 164                 written += res;
 165         }
 166
 167         OSMemoryBarrier();
 168
 169         done = true;
 170
 171         pthread_join(thread, NULL);
 172
 173         assert_no_err (close(fd));
 174
 175         end_background_io();
 176
 177         return 0;
 178 }
 179
 180 static bool clean_up(void)
 181 {
 182         end_background_io();
 183
 184         unlink(gFile1);
 185         unlink(gFile2);
 186         unlink(gFile3);
 187
 188         free(gFile1);
 189         free(gFile2);
 190         free(gFile3);
 191
 192         return true;
 193 }
 194
 195 int run_throttled_io(__unused test_ctx_t *ctx)
 196 {
 197         gDI = disk_image_get();
 198
 199         asprintf(&gFile1, "%s/throttled_io.1", gDI->mount_point);
 200         asprintf(&gFile2, "%s/throttled_io.2", gDI->mount_point);
 201         asprintf(&gFile3, "%s/throttled_io.3", gDI->mount_point);
 202
 203         test_cleanup(^ bool {
 204                 return clean_up();
 205         });
 206
 207         int res = run_test1();
 208         if (res)
 209                 return res;
 210
 211         res = run_test2();
 212         if (res)
 213                 return res;
 214
 215         return res;
 216 }