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 == DDIR_WRITE &&
 111                             !td->overwrite) {
 112                                 unlink(f->file_name);
 113                                 file_there = 0;
 114                         }
 115
 116                         need_create += !file_there;
 117                 }
 118         }
 119
 120         if (!need_create)
 121                 return 0;
 122
 123         if (!td->total_file_size) {
 124                 log_err("Need size for create\n");
 125                 td_verror(td, EINVAL);
 126                 return 1;
 127         }
 128
 129         temp_stall_ts = 1;
 130         fprintf(f_out, "%s: Laying out IO file(s) (%u x %LuMiB == %LuMiB)\n",
 131                                 td->name, td->nr_uniq_files,
 132                                 (td->total_file_size >> 20) / td->nr_uniq_files,
 133                                 td->total_file_size >> 20);
 134
 135         err = 0;
 136         for_each_file(td, f, i) {
 137                 /*
 138                  * Only unlink files that we created.
 139                  */
 140                 f->unlink = 0;
 141                 if (file_ok(td, f)) {
 142                         f->unlink = td->unlink;
 143                         err = create_file(td, f);
 144                         if (err)
 145                                 break;
 146                 }
 147         }
 148
 149         temp_stall_ts = 0;
 150         return err;
 151 }
 152
 153 static int file_size(struct thread_data *td, struct fio_file *f)
 154 {
 155         struct stat st;
 156
 157         if (td->overwrite) {
 158                 if (fstat(f->fd, &st) == -1) {
 159                         td_verror(td, errno);
 160                         return 1;
 161                 }
 162
 163                 f->real_file_size = st.st_size;
 164
 165                 if (!f->file_size || f->file_size > f->real_file_size)
 166                         f->file_size = f->real_file_size;
 167         } else
 168                 f->real_file_size = f->file_size;
 169
 170         return 0;
 171 }
 172
 173 static int bdev_size(struct thread_data *td, struct fio_file *f)
 174 {
 175         unsigned long long bytes;
 176         int r;
 177
 178         r = blockdev_size(f->fd, &bytes);
 179         if (r) {
 180                 td_verror(td, r);
 181                 return 1;
 182         }
 183
 184         f->real_file_size = bytes;
 185
 186         /*
 187          * no extend possibilities, so limit size to device size if too large
 188          */
 189         if (!f->file_size || f->file_size > f->real_file_size)
 190                 f->file_size = f->real_file_size;
 191
 192         f->file_size -= f->file_offset;
 193         return 0;
 194 }
 195
 196 static int get_file_size(struct thread_data *td, struct fio_file *f)
 197 {
 198         int ret = 0;
 199
 200         if (td->filetype == FIO_TYPE_FILE)
 201                 ret = file_size(td, f);
 202         else if (td->filetype == FIO_TYPE_BD)
 203                 ret = bdev_size(td, f);
 204         else
 205                 f->real_file_size = -1;
 206
 207         if (ret)
 208                 return ret;
 209
 210         if (f->file_offset > f->real_file_size) {
 211                 log_err("%s: offset extends end (%Lu > %Lu)\n", td->name, f->file_offset, f->real_file_size);
 212                 return 1;
 213         }
 214
 215         return 0;
 216 }
 217
 218 int file_invalidate_cache(struct thread_data *td, struct fio_file *f)
 219 {
 220         int ret = 0;
 221
 222         /*
 223          * FIXME: add blockdev flushing too
 224          */
 225         if (td->io_ops->flags & FIO_MMAPIO)
 226                 ret = madvise(f->mmap, f->file_size, MADV_DONTNEED);
 227         else if (td->filetype == FIO_TYPE_FILE)
 228                 ret = fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_DONTNEED);
 229         else if (td->filetype == FIO_TYPE_BD)
 230                 ret = blockdev_invalidate_cache(f->fd);
 231         else if (td->filetype == FIO_TYPE_CHAR)
 232                 ret = 0;
 233
 234         if (ret < 0) {
 235                 td_verror(td, errno);
 236                 return 1;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static int __setup_file_mmap(struct thread_data *td, struct fio_file *f)
 243 {
 244         int flags;
 245
 246         if (td_rw(td))
 247                 flags = PROT_READ | PROT_WRITE;
 248         else if (td_write(td)) {
 249                 flags = PROT_WRITE;
 250
 251                 if (td->verify != VERIFY_NONE)
 252                         flags |= PROT_READ;
 253         } else
 254                 flags = PROT_READ;
 255
 256         f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
 257         if (f->mmap == MAP_FAILED) {
 258                 f->mmap = NULL;
 259                 td_verror(td, errno);
 260                 return 1;
 261         }
 262
 263         if (td->invalidate_cache && file_invalidate_cache(td, f))
 264                 return 1;
 265
 266         if (td->sequential) {
 267                 if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
 268                         td_verror(td, errno);
 269                         return 1;
 270                 }
 271         } else {
 272                 if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
 273                         td_verror(td, errno);
 274                         return 1;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int setup_files_mmap(struct thread_data *td)
 282 {
 283         struct fio_file *f;
 284         int i, err = 0;
 285
 286         for_each_file(td, f, i) {
 287                 err = __setup_file_mmap(td, f);
 288                 if (err)
 289                         break;
 290         }
 291
 292         return err;
 293 }
 294
 295 static int __setup_file_plain(struct thread_data *td, struct fio_file *f)
 296 {
 297         if (td->invalidate_cache && file_invalidate_cache(td, f))
 298                 return 1;
 299
 300         if (td->sequential) {
 301                 if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_SEQUENTIAL) < 0) {
 302                         td_verror(td, errno);
 303                         return 1;
 304                 }
 305         } else {
 306                 if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_RANDOM) < 0) {
 307                         td_verror(td, errno);
 308                         return 1;
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int setup_files_plain(struct thread_data *td)
 316 {
 317         struct fio_file *f;
 318         int i, err = 0;
 319
 320         for_each_file(td, f, i) {
 321                 err = __setup_file_plain(td, f);
 322                 if (err)
 323                         break;
 324         }
 325
 326         return err;
 327 }
 328
 329 static int setup_file(struct thread_data *td, struct fio_file *f)
 330 {
 331         int flags = 0;
 332
 333         if (td->io_ops->flags & FIO_NETIO)
 334                 return 0;
 335         if (td->odirect)
 336                 flags |= OS_O_DIRECT;
 337         if (td->sync_io)
 338                 flags |= O_SYNC;
 339
 340         if (td_write(td) || td_rw(td)) {
 341                 flags |= O_RDWR;
 342
 343                 if (td->filetype == FIO_TYPE_FILE) {
 344                         if (!td->overwrite)
 345                                 flags |= O_TRUNC;
 346
 347                         flags |= O_CREAT;
 348                 }
 349
 350                 f->fd = open(f->file_name, flags, 0600);
 351         } else {
 352                 if (td->filetype == FIO_TYPE_CHAR)
 353                         flags |= O_RDWR;
 354                 else
 355                         flags |= O_RDONLY;
 356
 357                 f->fd = open(f->file_name, flags);
 358         }
 359
 360         if (f->fd == -1) {
 361                 td_verror(td, errno);
 362                 return 1;
 363         }
 364
 365         if (get_file_size(td, f))
 366                 return 1;
 367
 368         return 0;
 369 }
 370
 371 int open_files(struct thread_data *td)
 372 {
 373         struct fio_file *f;
 374         int i, err = 0;
 375
 376         for_each_file(td, f, i) {
 377                 err = setup_file(td, f);
 378                 if (err)
 379                         break;
 380         }
 381
 382         if (!err)
 383                 return 0;
 384
 385         for_each_file(td, f, i) {
 386                 if (f->fd != -1) {
 387                         close(f->fd);
 388                         f->fd = -1;
 389                 }
 390         }
 391
 392         return err;
 393 }
 394
 395 int setup_files(struct thread_data *td)
 396 {
 397         struct fio_file *f;
 398         int err, i;
 399
 400         /*
 401          * if ioengine defines a setup() method, it's responsible for
 402          * setting up everything in the td->files[] area.
 403          */
 404         if (td->io_ops->setup)
 405                 return td->io_ops->setup(td);
 406
 407         if (create_files(td))
 408                 return 1;
 409
 410         err = open_files(td);
 411         if (err)
 412                 return err;
 413
 414         /*
 415          * Recalculate the total file size now that files are set up.
 416          */
 417         td->total_file_size = 0;
 418         for_each_file(td, f, i)
 419                 td->total_file_size += f->file_size;
 420
 421         td->io_size = td->total_file_size;
 422         if (td->io_size == 0) {
 423                 log_err("%s: no io blocks\n", td->name);
 424                 td_verror(td, EINVAL);
 425                 return 1;
 426         }
 427
 428         if (!td->zone_size)
 429                 td->zone_size = td->io_size;
 430
 431         td->total_io_size = td->io_size * td->loops;
 432
 433         if (td->io_ops->flags & FIO_MMAPIO)
 434                 err = setup_files_mmap(td);
 435         else
 436                 err = setup_files_plain(td);
 437
 438         for_each_file(td, f, i) {
 439                 if (f->fd != -1) {
 440                         close(f->fd);
 441                         f->fd = -1;
 442                 }
 443         }
 444
 445         return err;
 446 }
 447
 448 void close_files(struct thread_data *td)
 449 {
 450         struct fio_file *f;
 451         int i;
 452
 453         for_each_file(td, f, i) {
 454                 if (!td->filename && f->unlink &&
 455                     td->filetype == FIO_TYPE_FILE) {
 456                         unlink(f->file_name);
 457                         free(f->file_name);
 458                         f->file_name = NULL;
 459                 }
 460                 if (f->fd != -1) {
 461                         close(f->fd);
 462                         f->fd = -1;
 463                 }
 464                 if (f->mmap) {
 465                         munmap(f->mmap, f->file_size);
 466                         f->mmap = NULL;
 467                 }
 468         }
 469
 470         td->filename = NULL;
 471         free(td->files);
 472         td->files = NULL;
 473         td->nr_files = 0;
 474 }