filesetup.c

   1 #include <unistd.h>
   2 #include <fcntl.h>
   3 #include <string.h>
   4 #include <assert.h>
   5 #include <sys/stat.h>
   6 #include <sys/mman.h>
   7
   8 #include "fio.h"
   9 #include "os.h"
  10
  11 /*
  12  * Check if the file exists and it's large enough.
  13  */
  14 static int file_ok(struct thread_data *td, struct fio_file *f)
  15 {
  16         struct stat st;
  17
  18         if (td->filetype != FIO_TYPE_FILE)
  19                 return 0;
  20
  21         if (stat(f->file_name, &st) == -1)
  22                 return 1;
  23         else if (st.st_size < (off_t) f->file_size)
  24                 return 1;
  25
  26         return 0;
  27 }
  28
  29 static int create_file(struct thread_data *td, struct fio_file *f)
  30 {
  31         unsigned long long left;
  32         unsigned int bs;
  33         char *b;
  34         int r;
  35
  36         f->fd = open(f->file_name, O_WRONLY | O_CREAT | O_TRUNC, 0644);
  37         if (f->fd < 0) {
  38                 td_verror(td, errno);
  39                 return 1;
  40         }
  41
  42         if (ftruncate(f->fd, f->file_size) == -1) {
  43                 td_verror(td, errno);
  44                 goto err;
  45         }
  46
  47         if (posix_fallocate(f->fd, 0, f->file_size) < 0) {
  48                 td_verror(td, errno);
  49                 goto err;
  50         }
  51
  52         b = malloc(td->max_bs[DDIR_WRITE]);
  53         memset(b, 0, td->max_bs[DDIR_WRITE]);
  54
  55         left = f->file_size;
  56         while (left && !td->terminate) {
  57                 bs = td->max_bs[DDIR_WRITE];
  58                 if (bs > left)
  59                         bs = left;
  60
  61                 r = write(f->fd, b, bs);
  62
  63                 if (r == (int) bs) {
  64                         left -= bs;
  65                         continue;
  66                 } else {
  67                         if (r < 0)
  68                                 td_verror(td, errno);
  69                         else
  70                                 td_verror(td, EIO);
  71
  72                         break;
  73                 }
  74         }
  75
  76         if (td->terminate)
  77                 unlink(f->file_name);
  78         else if (td->create_fsync)
  79                 fsync(f->fd);
  80
  81         free(b);
  82         close(f->fd);
  83         f->fd = -1;
  84         return 0;
  85 err:
  86         close(f->fd);
  87         f->fd = -1;
  88         return 1;
  89 }
  90
  91 static int create_files(struct thread_data *td)
  92 {
  93         struct fio_file *f;
  94         int i, err, need_create;
  95
  96         for_each_file(td, f, i)
  97                 f->file_size = td->total_file_size / td->nr_files;
  98
  99         /*
 100          * unless specifically asked for overwrite, let normal io extend it
 101          */
 102         if (!td->overwrite)
 103                 return 0;
 104
 105         need_create = 0;
 106         if (td->filetype == FIO_TYPE_FILE) {
 107                 for_each_file(td, f, i) {
 108                         int file_there = !file_ok(td, f);
 109
 110                         if (file_there && td->ddir == WRITE && !td->overwrite) {
 111                                 unlink(f->file_name);
 112                                 file_there = 0;
 113                         }
 114
 115                         need_create += !file_there;
 116                 }
 117         }
 118
 119         if (!need_create)
 120                 return 0;
 121
 122         if (!td->total_file_size) {
 123                 log_err("Need size for create\n");
 124                 td_verror(td, EINVAL);
 125                 return 1;
 126         }
 127
 128         temp_stall_ts = 1;
 129         fprintf(f_out, "%s: Laying out IO file(s) (%u x %LuMiB == %LuMiB)\n",
 130                                 td->name, td->nr_uniq_files,
 131                                 (td->total_file_size >> 20) / td->nr_uniq_files,
 132                                 td->total_file_size >> 20);
 133
 134         err = 0;
 135         for_each_file(td, f, i) {
 136                 /*
 137                  * Only unlink files that we created.
 138                  */
 139                 f->unlink = 0;
 140                 if (file_ok(td, f)) {
 141                         f->unlink = td->unlink;
 142                         err = create_file(td, f);
 143                         if (err)
 144                                 break;
 145                 }
 146         }
 147
 148         temp_stall_ts = 0;
 149         return err;
 150 }
 151
 152 static int file_size(struct thread_data *td, struct fio_file *f)
 153 {
 154         struct stat st;
 155
 156         if (td->overwrite) {
 157                 if (fstat(f->fd, &st) == -1) {
 158                         td_verror(td, errno);
 159                         return 1;
 160                 }
 161
 162                 f->real_file_size = st.st_size;
 163
 164                 if (!f->file_size || f->file_size > f->real_file_size)
 165                         f->file_size = f->real_file_size;
 166         } else
 167                 f->real_file_size = f->file_size;
 168
 169         return 0;
 170 }
 171
 172 static int bdev_size(struct thread_data *td, struct fio_file *f)
 173 {
 174         unsigned long long bytes;
 175         int r;
 176
 177         r = blockdev_size(f->fd, &bytes);
 178         if (r) {
 179                 td_verror(td, r);
 180                 return 1;
 181         }
 182
 183         f->real_file_size = bytes;
 184
 185         /*
 186          * no extend possibilities, so limit size to device size if too large
 187          */
 188         if (!f->file_size || f->file_size > f->real_file_size)
 189                 f->file_size = f->real_file_size;
 190
 191         f->file_size -= f->file_offset;
 192         return 0;
 193 }
 194
 195 static int get_file_size(struct thread_data *td, struct fio_file *f)
 196 {
 197         int ret = 0;
 198
 199         if (td->filetype == FIO_TYPE_FILE)
 200                 ret = file_size(td, f);
 201         else if (td->filetype == FIO_TYPE_BD)
 202                 ret = bdev_size(td, f);
 203         else
 204                 f->real_file_size = -1;
 205
 206         if (ret)
 207                 return ret;
 208
 209         if (f->file_offset > f->real_file_size) {
 210                 log_err("%s: offset extends end (%Lu > %Lu)\n", td->name, f->file_offset, f->real_file_size);
 211                 return 1;
 212         }
 213
 214         return 0;
 215 }
 216
 217 int file_invalidate_cache(struct thread_data *td, struct fio_file *f)
 218 {
 219         int ret = 0;
 220
 221         /*
 222          * FIXME: add blockdev flushing too
 223          */
 224         if (td->io_ops->flags & FIO_MMAPIO)
 225                 ret = madvise(f->mmap, f->file_size, MADV_DONTNEED);
 226         else if (td->filetype == FIO_TYPE_FILE)
 227                 ret = fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_DONTNEED);
 228         else if (td->filetype == FIO_TYPE_BD)
 229                 ret = blockdev_invalidate_cache(f->fd);
 230         else if (td->filetype == FIO_TYPE_CHAR)
 231                 ret = 0;
 232
 233         if (ret < 0) {
 234                 td_verror(td, errno);
 235                 return 1;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int __setup_file_mmap(struct thread_data *td, struct fio_file *f)
 242 {
 243         int flags;
 244
 245         if (td_rw(td))
 246                 flags = PROT_READ | PROT_WRITE;
 247         else if (td_write(td)) {
 248                 flags = PROT_WRITE;
 249
 250                 if (td->verify != VERIFY_NONE)
 251                         flags |= PROT_READ;
 252         } else
 253                 flags = PROT_READ;
 254
 255         f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
 256         if (f->mmap == MAP_FAILED) {
 257                 f->mmap = NULL;
 258                 td_verror(td, errno);
 259                 return 1;
 260         }
 261
 262         if (td->invalidate_cache && file_invalidate_cache(td, f))
 263                 return 1;
 264
 265         if (td->sequential) {
 266                 if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
 267                         td_verror(td, errno);
 268                         return 1;
 269                 }
 270         } else {
 271                 if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
 272                         td_verror(td, errno);
 273                         return 1;
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int setup_files_mmap(struct thread_data *td)
 281 {
 282         struct fio_file *f;
 283         int i, err = 0;
 284
 285         for_each_file(td, f, i) {
 286                 err = __setup_file_mmap(td, f);
 287                 if (err)
 288                         break;
 289         }
 290
 291         return err;
 292 }
 293
 294 static int __setup_file_plain(struct thread_data *td, struct fio_file *f)
 295 {
 296         if (td->invalidate_cache && file_invalidate_cache(td, f))
 297                 return 1;
 298
 299         if (td->sequential) {
 300                 if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_SEQUENTIAL) < 0) {
 301                         td_verror(td, errno);
 302                         return 1;
 303                 }
 304         } else {
 305                 if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_RANDOM) < 0) {
 306                         td_verror(td, errno);
 307                         return 1;
 308                 }
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int setup_files_plain(struct thread_data *td)
 315 {
 316         struct fio_file *f;
 317         int i, err = 0;
 318
 319         for_each_file(td, f, i) {
 320                 err = __setup_file_plain(td, f);
 321                 if (err)
 322                         break;
 323         }
 324
 325         return err;
 326 }
 327
 328 static int setup_file(struct thread_data *td, struct fio_file *f)
 329 {
 330         int flags = 0;
 331
 332         if (td->odirect)
 333                 flags |= OS_O_DIRECT;
 334         if (td->sync_io)
 335                 flags |= O_SYNC;
 336
 337         if (td_write(td) || td_rw(td)) {
 338                 flags |= O_RDWR;
 339
 340                 if (td->filetype == FIO_TYPE_FILE) {
 341                         if (!td->overwrite)
 342                                 flags |= O_TRUNC;
 343
 344                         flags |= O_CREAT;
 345                 }
 346
 347                 f->fd = open(f->file_name, flags, 0600);
 348         } else {
 349                 if (td->filetype == FIO_TYPE_CHAR)
 350                         flags |= O_RDWR;
 351                 else
 352                         flags |= O_RDONLY;
 353
 354                 f->fd = open(f->file_name, flags);
 355         }
 356
 357         if (f->fd == -1) {
 358                 td_verror(td, errno);
 359                 return 1;
 360         }
 361
 362         if (get_file_size(td, f))
 363                 return 1;
 364
 365         return 0;
 366 }
 367
 368 int open_files(struct thread_data *td)
 369 {
 370         struct fio_file *f;
 371         int i, err = 0;
 372
 373         for_each_file(td, f, i) {
 374                 err = setup_file(td, f);
 375                 if (err)
 376                         break;
 377         }
 378
 379         if (!err)
 380                 return 0;
 381
 382         for_each_file(td, f, i) {
 383                 if (f->fd != -1) {
 384                         close(f->fd);
 385                         f->fd = -1;
 386                 }
 387         }
 388
 389         return err;
 390 }
 391
 392 int setup_files(struct thread_data *td)
 393 {
 394         struct fio_file *f;
 395         int err, i;
 396
 397         /*
 398          * if ioengine defines a setup() method, it's responsible for
 399          * setting up everything in the td->files[] area.
 400          */
 401         if (td->io_ops->setup)
 402                 return td->io_ops->setup(td);
 403
 404         if (create_files(td))
 405                 return 1;
 406
 407         err = open_files(td);
 408         if (err)
 409                 return err;
 410
 411         /*
 412          * Recalculate the total file size now that files are set up.
 413          */
 414         td->total_file_size = 0;
 415         for_each_file(td, f, i)
 416                 td->total_file_size += f->file_size;
 417
 418         td->io_size = td->total_file_size;
 419         if (td->io_size == 0) {
 420                 log_err("%s: no io blocks\n", td->name);
 421                 td_verror(td, EINVAL);
 422                 return 1;
 423         }
 424
 425         if (!td->zone_size)
 426                 td->zone_size = td->io_size;
 427
 428         td->total_io_size = td->io_size * td->loops;
 429
 430         if (td->io_ops->flags & FIO_MMAPIO)
 431                 err = setup_files_mmap(td);
 432         else
 433                 err = setup_files_plain(td);
 434
 435         for_each_file(td, f, i) {
 436                 if (f->fd != -1) {
 437                         close(f->fd);
 438                         f->fd = -1;
 439                 }
 440         }
 441
 442         return err;
 443 }
 444
 445 void close_files(struct thread_data *td)
 446 {
 447         struct fio_file *f;
 448         int i;
 449
 450         for_each_file(td, f, i) {
 451                 if (!td->filename && f->unlink &&
 452                     td->filetype == FIO_TYPE_FILE) {
 453                         unlink(f->file_name);
 454                         free(f->file_name);
 455                         f->file_name = NULL;
 456                 }
 457                 if (f->fd != -1) {
 458                         close(f->fd);
 459                         f->fd = -1;
 460                 }
 461                 if (f->mmap) {
 462                         munmap(f->mmap, f->file_size);
 463                         f->mmap = NULL;
 464                 }
 465         }
 466
 467         td->filename = NULL;
 468         free(td->files);
 469         td->files = NULL;
 470         td->nr_files = 0;
 471 }