sys/vfs/hammer/hammer_volume.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com> and
   6  * Michael Neumann <mneumann@ntecs.de>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "hammer.h"
  38 #include <sys/fcntl.h>
  39 #include <sys/nlookup.h>
  40 #include <sys/buf.h>
  41
  42 #include <sys/buf2.h>
  43
  44 static int
  45 hammer_setup_device(struct vnode **devvpp, const char *dev_path, int ronly);
  46
  47 static void
  48 hammer_close_device(struct vnode **devvpp, int ronly);
  49
  50 static int
  51 hammer_format_volume_header(struct hammer_mount *hmp, struct vnode *devvp,
  52         const char *vol_name, int vol_no, int vol_count,
  53         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size);
  54
  55 static int
  56 hammer_clear_volume_header(struct vnode *devvp);
  57
  58 struct bigblock_stat {
  59         uint64_t total_bigblocks;
  60         uint64_t total_free_bigblocks;
  61         uint64_t counter;
  62 };
  63
  64 static int
  65 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  66         struct bigblock_stat *stat);
  67
  68 static int
  69 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  70         struct bigblock_stat *stat);
  71
  72 int
  73 hammer_ioc_volume_add(hammer_transaction_t trans, hammer_inode_t ip,
  74                 struct hammer_ioc_volume *ioc)
  75 {
  76         struct hammer_mount *hmp = trans->hmp;
  77         struct mount *mp = hmp->mp;
  78         hammer_volume_t volume;
  79         int error;
  80
  81         if (mp->mnt_flag & MNT_RDONLY) {
  82                 kprintf("Cannot add volume to read-only HAMMER filesystem\n");
  83                 return (EINVAL);
  84         }
  85
  86         if (hmp->nvolumes + 1 >= HAMMER_MAX_VOLUMES) {
  87                 kprintf("Max number of HAMMER volumes exceeded\n");
  88                 return (EINVAL);
  89         }
  90
  91         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
  92                 kprintf("Another volume operation is in progress!\n");
  93                 return (EAGAIN);
  94         }
  95
  96         /*
  97          * Find an unused volume number.
  98          */
  99         int free_vol_no = 0;
 100         while (free_vol_no < HAMMER_MAX_VOLUMES &&
 101                RB_LOOKUP(hammer_vol_rb_tree, &hmp->rb_vols_root, free_vol_no)) {
 102                 ++free_vol_no;
 103         }
 104         if (free_vol_no >= HAMMER_MAX_VOLUMES) {
 105                 kprintf("Max number of HAMMER volumes exceeded\n");
 106                 hammer_unlock(&hmp->volume_lock);
 107                 return (EINVAL);
 108         }
 109
 110         struct vnode *devvp = NULL;
 111         error = hammer_setup_device(&devvp, ioc->device_name, 0);
 112         if (error)
 113                 goto end;
 114         KKASSERT(devvp);
 115         error = hammer_format_volume_header(
 116                 hmp,
 117                 devvp,
 118                 hmp->rootvol->ondisk->vol_name,
 119                 free_vol_no,
 120                 hmp->nvolumes+1,
 121                 ioc->vol_size,
 122                 ioc->boot_area_size,
 123                 ioc->mem_area_size);
 124         hammer_close_device(&devvp, 0);
 125         if (error)
 126                 goto end;
 127
 128         error = hammer_install_volume(hmp, ioc->device_name, NULL);
 129         if (error)
 130                 goto end;
 131
 132         hammer_sync_lock_sh(trans);
 133         hammer_lock_ex(&hmp->blkmap_lock);
 134
 135         ++hmp->nvolumes;
 136
 137         /*
 138          * Set each volumes new value of the vol_count field.
 139          */
 140         for (int vol_no = 0; vol_no < HAMMER_MAX_VOLUMES; ++vol_no) {
 141                 volume = hammer_get_volume(hmp, vol_no, &error);
 142                 if (volume == NULL && error == ENOENT) {
 143                         /*
 144                          * Skip unused volume numbers
 145                          */
 146                         error = 0;
 147                         continue;
 148                 }
 149                 KKASSERT(volume != NULL && error == 0);
 150                 hammer_modify_volume_field(trans, volume, vol_count);
 151                 volume->ondisk->vol_count = hmp->nvolumes;
 152                 hammer_modify_volume_done(volume);
 153
 154                 /*
 155                  * Only changes to the header of the root volume
 156                  * are automatically flushed to disk. For all
 157                  * other volumes that we modify we do it here.
 158                  *
 159                  * No interlock is needed, volume buffers are not
 160                  * messed with by bioops.
 161                  */
 162                 if (volume != trans->rootvol && volume->io.modified) {
 163                         hammer_crc_set_volume(volume->ondisk);
 164                         hammer_io_flush(&volume->io, 0);
 165                 }
 166
 167                 hammer_rel_volume(volume, 0);
 168         }
 169
 170         volume = hammer_get_volume(hmp, free_vol_no, &error);
 171         KKASSERT(volume != NULL && error == 0);
 172
 173         struct bigblock_stat stat;
 174         error = hammer_format_freemap(trans, volume, &stat);
 175         KKASSERT(error == 0);
 176
 177         /*
 178          * Increase the total number of bigblocks and update stat/vstat totals.
 179          */
 180         hammer_modify_volume_field(trans, trans->rootvol,
 181                 vol0_stat_bigblocks);
 182         trans->rootvol->ondisk->vol0_stat_bigblocks += stat.total_bigblocks;
 183         hammer_modify_volume_done(trans->rootvol);
 184         /*
 185          * Bigblock count changed so recompute the total number of blocks.
 186          */
 187         mp->mnt_stat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 188             (HAMMER_LARGEBLOCK_SIZE / HAMMER_BUFSIZE);
 189         mp->mnt_vstat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 190             (HAMMER_LARGEBLOCK_SIZE / HAMMER_BUFSIZE);
 191
 192         /*
 193          * Increase the number of free bigblocks
 194          * (including the copy in hmp)
 195          */
 196         hammer_modify_volume_field(trans, trans->rootvol,
 197                 vol0_stat_freebigblocks);
 198         trans->rootvol->ondisk->vol0_stat_freebigblocks += stat.total_free_bigblocks;
 199         hmp->copy_stat_freebigblocks =
 200                 trans->rootvol->ondisk->vol0_stat_freebigblocks;
 201         hammer_modify_volume_done(trans->rootvol);
 202
 203         hammer_rel_volume(volume, 0);
 204
 205         hammer_unlock(&hmp->blkmap_lock);
 206         hammer_sync_unlock(trans);
 207
 208         KKASSERT(error == 0);
 209 end:
 210         hammer_unlock(&hmp->volume_lock);
 211         if (error)
 212                 kprintf("An error occurred: %d\n", error);
 213         return (error);
 214 }
 215
 216
 217 /*
 218  * Remove a volume.
 219  */
 220 int
 221 hammer_ioc_volume_del(hammer_transaction_t trans, hammer_inode_t ip,
 222                 struct hammer_ioc_volume *ioc)
 223 {
 224         struct hammer_mount *hmp = trans->hmp;
 225         struct mount *mp = hmp->mp;
 226         hammer_volume_t volume;
 227         int error = 0;
 228
 229         if (mp->mnt_flag & MNT_RDONLY) {
 230                 kprintf("Cannot del volume from read-only HAMMER filesystem\n");
 231                 return (EINVAL);
 232         }
 233
 234         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 235                 kprintf("Another volume operation is in progress!\n");
 236                 return (EAGAIN);
 237         }
 238
 239         volume = NULL;
 240
 241         /*
 242          * find volume by volname
 243          */
 244         for (int vol_no = 0; vol_no < HAMMER_MAX_VOLUMES; ++vol_no) {
 245                 volume = hammer_get_volume(hmp, vol_no, &error);
 246                 if (volume == NULL && error == ENOENT) {
 247                         /*
 248                          * Skip unused volume numbers
 249                          */
 250                         error = 0;
 251                         continue;
 252                 }
 253                 KKASSERT(volume != NULL && error == 0);
 254                 if (strcmp(volume->vol_name, ioc->device_name) == 0) {
 255                         break;
 256                 }
 257                 hammer_rel_volume(volume, 0);
 258                 volume = NULL;
 259         }
 260
 261         if (volume == NULL) {
 262                 kprintf("Couldn't find volume\n");
 263                 error = EINVAL;
 264                 goto end;
 265         }
 266
 267         if (volume == trans->rootvol) {
 268                 kprintf("Cannot remove root-volume\n");
 269                 hammer_rel_volume(volume, 0);
 270                 error = EINVAL;
 271                 goto end;
 272         }
 273
 274         /*
 275          *
 276          */
 277
 278         hmp->volume_to_remove = volume->vol_no;
 279
 280         struct hammer_ioc_reblock reblock;
 281         bzero(&reblock, sizeof(reblock));
 282
 283         reblock.key_beg.localization = HAMMER_MIN_LOCALIZATION;
 284         reblock.key_beg.obj_id = HAMMER_MIN_OBJID;
 285         reblock.key_end.localization = HAMMER_MAX_LOCALIZATION;
 286         reblock.key_end.obj_id = HAMMER_MAX_OBJID;
 287         reblock.head.flags = HAMMER_IOC_DO_FLAGS;
 288         reblock.free_level = 0;
 289
 290         error = hammer_ioc_reblock(trans, ip, &reblock);
 291
 292         if (reblock.head.flags & HAMMER_IOC_HEAD_INTR) {
 293                 error = EINTR;
 294         }
 295
 296         if (error) {
 297                 if (error == EINTR) {
 298                         kprintf("reblock was interrupted\n");
 299                 } else {
 300                         kprintf("reblock failed: %d\n", error);
 301                 }
 302                 hmp->volume_to_remove = -1;
 303                 hammer_rel_volume(volume, 0);
 304                 goto end;
 305         }
 306
 307         /*
 308          * Sync filesystem
 309          */
 310         int count = 0;
 311         while (hammer_flusher_haswork(hmp)) {
 312                 hammer_flusher_sync(hmp);
 313                 ++count;
 314                 if (count >= 5) {
 315                         if (count == 5)
 316                                 kprintf("HAMMER: flushing.");
 317                         else
 318                                 kprintf(".");
 319                         tsleep(&count, 0, "hmrufl", hz);
 320                 }
 321                 if (count == 30) {
 322                         kprintf("giving up");
 323                         break;
 324                 }
 325         }
 326         kprintf("\n");
 327
 328         hammer_sync_lock_sh(trans);
 329         hammer_lock_ex(&hmp->blkmap_lock);
 330
 331         /*
 332          * We use stat later to update rootvol's bigblock stats
 333          */
 334         struct bigblock_stat stat;
 335         error = hammer_free_freemap(trans, volume, &stat);
 336         if (error) {
 337                 kprintf("Failed to free volume. Volume not empty!\n");
 338                 hmp->volume_to_remove = -1;
 339                 hammer_rel_volume(volume, 0);
 340                 hammer_unlock(&hmp->blkmap_lock);
 341                 hammer_sync_unlock(trans);
 342                 goto end;
 343         }
 344
 345         hmp->volume_to_remove = -1;
 346
 347         hammer_rel_volume(volume, 0);
 348
 349         /*
 350          * Unload buffers
 351          */
 352         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 353                 hammer_unload_buffer, volume);
 354
 355         error = hammer_unload_volume(volume, NULL);
 356         if (error == -1) {
 357                 kprintf("Failed to unload volume\n");
 358                 hammer_unlock(&hmp->blkmap_lock);
 359                 hammer_sync_unlock(trans);
 360                 goto end;
 361         }
 362
 363         volume = NULL;
 364         --hmp->nvolumes;
 365
 366         /*
 367          * Set each volume's new value of the vol_count field.
 368          */
 369         for (int vol_no = 0; vol_no < HAMMER_MAX_VOLUMES; ++vol_no) {
 370                 volume = hammer_get_volume(hmp, vol_no, &error);
 371                 if (volume == NULL && error == ENOENT) {
 372                         /*
 373                          * Skip unused volume numbers
 374                          */
 375                         error = 0;
 376                         continue;
 377                 }
 378
 379                 KKASSERT(volume != NULL && error == 0);
 380                 hammer_modify_volume_field(trans, volume, vol_count);
 381                 volume->ondisk->vol_count = hmp->nvolumes;
 382                 hammer_modify_volume_done(volume);
 383
 384                 /*
 385                  * Only changes to the header of the root volume
 386                  * are automatically flushed to disk. For all
 387                  * other volumes that we modify we do it here.
 388                  *
 389                  * No interlock is needed, volume buffers are not
 390                  * messed with by bioops.
 391                  */
 392                 if (volume != trans->rootvol && volume->io.modified) {
 393                         hammer_crc_set_volume(volume->ondisk);
 394                         hammer_io_flush(&volume->io, 0);
 395                 }
 396
 397                 hammer_rel_volume(volume, 0);
 398         }
 399
 400         /*
 401          * Update the total number of bigblocks
 402          */
 403         hammer_modify_volume_field(trans, trans->rootvol,
 404                 vol0_stat_bigblocks);
 405         trans->rootvol->ondisk->vol0_stat_bigblocks -= stat.total_bigblocks;
 406         hammer_modify_volume_done(trans->rootvol);
 407
 408         /*
 409          * Update the number of free bigblocks
 410          * (including the copy in hmp)
 411          */
 412         hammer_modify_volume_field(trans, trans->rootvol,
 413                 vol0_stat_freebigblocks);
 414         trans->rootvol->ondisk->vol0_stat_freebigblocks -= stat.total_free_bigblocks;
 415         hmp->copy_stat_freebigblocks =
 416                 trans->rootvol->ondisk->vol0_stat_freebigblocks;
 417         hammer_modify_volume_done(trans->rootvol);
 418         /*
 419          * Bigblock count changed so recompute the total number of blocks.
 420          */
 421         mp->mnt_stat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 422             (HAMMER_LARGEBLOCK_SIZE / HAMMER_BUFSIZE);
 423         mp->mnt_vstat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 424             (HAMMER_LARGEBLOCK_SIZE / HAMMER_BUFSIZE);
 425
 426         hammer_unlock(&hmp->blkmap_lock);
 427         hammer_sync_unlock(trans);
 428
 429         /*
 430          * Erase the volume header of the removed device.
 431          *
 432          * This is to not accidentally mount the volume again.
 433          */
 434         struct vnode *devvp = NULL;
 435         error = hammer_setup_device(&devvp, ioc->device_name, 0);
 436         if (error) {
 437                 kprintf("Failed to open device: %s\n", ioc->device_name);
 438                 goto end;
 439         }
 440         KKASSERT(devvp);
 441         error = hammer_clear_volume_header(devvp);
 442         if (error) {
 443                 kprintf("Failed to clear volume header of device: %s\n",
 444                         ioc->device_name);
 445                 goto end;
 446         }
 447         hammer_close_device(&devvp, 0);
 448
 449         KKASSERT(error == 0);
 450 end:
 451         hammer_unlock(&hmp->volume_lock);
 452         return (error);
 453 }
 454
 455
 456 int
 457 hammer_ioc_volume_list(hammer_transaction_t trans, hammer_inode_t ip,
 458     struct hammer_ioc_volume_list *ioc)
 459 {
 460         struct hammer_mount *hmp = trans->hmp;
 461         hammer_volume_t volume;
 462         int error = 0;
 463         int i, cnt, len;
 464
 465         for (i = 0, cnt = 0; i < HAMMER_MAX_VOLUMES && cnt < ioc->nvols; i++) {
 466                 volume = hammer_get_volume(hmp, i, &error);
 467                 if (volume == NULL && error == ENOENT) {
 468                         error = 0;
 469                         continue;
 470                 }
 471                 KKASSERT(volume != NULL && error == 0);
 472
 473                 len = strlen(volume->vol_name) + 1;
 474                 KKASSERT(len <= MAXPATHLEN);
 475
 476                 error = copyout(volume->vol_name, ioc->vols[cnt].device_name,
 477                                 len);
 478                 if (error) {
 479                         hammer_rel_volume(volume, 0);
 480                         return (error);
 481                 }
 482                 cnt++;
 483                 hammer_rel_volume(volume, 0);
 484         }
 485         ioc->nvols = cnt;
 486
 487         return (error);
 488 }
 489
 490 /*
 491  * Iterate over all usable L1 entries of the volume and
 492  * the corresponding L2 entries.
 493  */
 494 static int
 495 hammer_iterate_l1l2_entries(hammer_transaction_t trans, hammer_volume_t volume,
 496         int (*callback)(hammer_transaction_t, hammer_volume_t, hammer_buffer_t*,
 497                 struct hammer_blockmap_layer1*, struct hammer_blockmap_layer2*,
 498                 hammer_off_t, hammer_off_t, void*),
 499         void *data)
 500 {
 501         struct hammer_mount *hmp = trans->hmp;
 502         hammer_blockmap_t freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 503         hammer_buffer_t buffer = NULL;
 504         int error = 0;
 505
 506         hammer_off_t phys_off;
 507         hammer_off_t block_off;
 508         hammer_off_t layer1_off;
 509         hammer_off_t layer2_off;
 510         hammer_off_t aligned_buf_end_off;
 511         struct hammer_blockmap_layer1 *layer1;
 512         struct hammer_blockmap_layer2 *layer2;
 513
 514         /*
 515          * Calculate the usable size of the volume, which
 516          * must be aligned at a bigblock (8 MB) boundary.
 517          */
 518         aligned_buf_end_off = (HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 519                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 520                 & ~HAMMER_LARGEBLOCK_MASK64));
 521
 522         /*
 523          * Iterate the volume's address space in chunks of 4 TB, where each
 524          * chunk consists of at least one physically available 8 MB bigblock.
 525          *
 526          * For each chunk we need one L1 entry and one L2 bigblock.
 527          * We use the first bigblock of each chunk as L2 block.
 528          */
 529         for (phys_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no, 0);
 530              phys_off < aligned_buf_end_off;
 531              phys_off += HAMMER_BLOCKMAP_LAYER2) {
 532                 for (block_off = 0;
 533                      block_off < HAMMER_BLOCKMAP_LAYER2;
 534                      block_off += HAMMER_LARGEBLOCK_SIZE) {
 535                         layer2_off = phys_off +
 536                                 HAMMER_BLOCKMAP_LAYER2_OFFSET(block_off);
 537                         layer2 = hammer_bread(hmp, layer2_off, &error, &buffer);
 538                         if (error)
 539                                 goto end;
 540
 541                         error = callback(trans, volume, &buffer, NULL,
 542                                          layer2, phys_off, block_off, data);
 543                         if (error)
 544                                 goto end;
 545                 }
 546
 547                 layer1_off = freemap->phys_offset +
 548                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_off);
 549                 layer1 = hammer_bread(hmp, layer1_off, &error, &buffer);
 550                 if (error)
 551                         goto end;
 552
 553                 error = callback(trans, volume, &buffer, layer1, NULL,
 554                                  phys_off, 0, data);
 555                 if (error)
 556                         goto end;
 557         }
 558
 559 end:
 560         if (buffer) {
 561                 hammer_rel_buffer(buffer, 0);
 562                 buffer = NULL;
 563         }
 564
 565         return error;
 566 }
 567
 568
 569 static int
 570 format_callback(hammer_transaction_t trans, hammer_volume_t volume,
 571         hammer_buffer_t *bufferp,
 572         struct hammer_blockmap_layer1 *layer1,
 573         struct hammer_blockmap_layer2 *layer2,
 574         hammer_off_t phys_off,
 575         hammer_off_t block_off,
 576         void *data)
 577 {
 578         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 579
 580         /*
 581          * Calculate the usable size of the volume, which must be aligned
 582          * at a bigblock (8 MB) boundary.
 583          */
 584         hammer_off_t aligned_buf_end_off;
 585         aligned_buf_end_off = (HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 586                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 587                 & ~HAMMER_LARGEBLOCK_MASK64));
 588
 589         if (layer1) {
 590                 KKASSERT(layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL);
 591
 592                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 593                 bzero(layer1, sizeof(*layer1));
 594                 layer1->phys_offset = phys_off;
 595                 layer1->blocks_free = stat->counter;
 596                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 597                 hammer_modify_buffer_done(*bufferp);
 598
 599                 stat->total_free_bigblocks += stat->counter;
 600                 stat->counter = 0; /* reset */
 601         } else if (layer2) {
 602                 hammer_modify_buffer(trans, *bufferp, layer2, sizeof(*layer2));
 603                 bzero(layer2, sizeof(*layer2));
 604
 605                 if (block_off == 0) {
 606                         /*
 607                          * The first entry represents the L2 bigblock itself.
 608                          */
 609                         layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 610                         layer2->append_off = HAMMER_LARGEBLOCK_SIZE;
 611                         layer2->bytes_free = 0;
 612                         ++stat->total_bigblocks;
 613                 } else if (phys_off + block_off < aligned_buf_end_off) {
 614                         /*
 615                          * Available bigblock
 616                          */
 617                         layer2->zone = 0;
 618                         layer2->append_off = 0;
 619                         layer2->bytes_free = HAMMER_LARGEBLOCK_SIZE;
 620                         ++stat->total_bigblocks;
 621                         ++stat->counter;
 622                 } else {
 623                         /*
 624                          * Bigblock outside of physically available
 625                          * space
 626                          */
 627                         layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 628                         layer2->append_off = HAMMER_LARGEBLOCK_SIZE;
 629                         layer2->bytes_free = 0;
 630                 }
 631
 632                 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
 633                 hammer_modify_buffer_done(*bufferp);
 634         } else {
 635                 KKASSERT(0);
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int
 642 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 643         struct bigblock_stat *stat)
 644 {
 645         stat->total_bigblocks = 0;
 646         stat->total_free_bigblocks = 0;
 647         stat->counter = 0;
 648         return hammer_iterate_l1l2_entries(trans, volume, format_callback, stat);
 649 }
 650
 651 static int
 652 free_callback(hammer_transaction_t trans, hammer_volume_t volume __unused,
 653         hammer_buffer_t *bufferp,
 654         struct hammer_blockmap_layer1 *layer1,
 655         struct hammer_blockmap_layer2 *layer2,
 656         hammer_off_t phys_off,
 657         hammer_off_t block_off __unused,
 658         void *data)
 659 {
 660         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 661
 662         /*
 663          * No modifications to ondisk structures
 664          */
 665         int testonly = (stat == NULL);
 666
 667         if (layer1) {
 668                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 669                         /*
 670                          * This layer1 entry is already free.
 671                          */
 672                         return 0;
 673                 }
 674
 675                 KKASSERT((int)HAMMER_VOL_DECODE(layer1->phys_offset) ==
 676                         trans->hmp->volume_to_remove);
 677
 678                 if (testonly)
 679                         return 0;
 680
 681                 /*
 682                  * Free the L1 entry
 683                  */
 684                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 685                 bzero(layer1, sizeof(*layer1));
 686                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 687                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 688                 hammer_modify_buffer_done(*bufferp);
 689
 690                 return 0;
 691         } else if (layer2) {
 692                 if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
 693                         return 0;
 694                 }
 695
 696                 if (layer2->zone == HAMMER_ZONE_FREEMAP_INDEX) {
 697                         if (stat) {
 698                                 ++stat->total_bigblocks;
 699                         }
 700                         return 0;
 701                 }
 702
 703                 if (layer2->append_off == 0 &&
 704                     layer2->bytes_free == HAMMER_LARGEBLOCK_SIZE) {
 705                         if (stat) {
 706                                 ++stat->total_bigblocks;
 707                                 ++stat->total_free_bigblocks;
 708                         }
 709                         return 0;
 710                 }
 711
 712                 /*
 713                  * We found a layer2 entry that is not empty!
 714                  */
 715                 return EBUSY;
 716         } else {
 717                 KKASSERT(0);
 718         }
 719
 720         return EINVAL;
 721 }
 722
 723 static int
 724 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 725         struct bigblock_stat *stat)
 726 {
 727         int error;
 728
 729         stat->total_bigblocks = 0;
 730         stat->total_free_bigblocks = 0;
 731         stat->counter = 0;
 732
 733         error = hammer_iterate_l1l2_entries(trans, volume, free_callback, NULL);
 734         if (error)
 735                 return error;
 736
 737         error = hammer_iterate_l1l2_entries(trans, volume, free_callback, stat);
 738         return error;
 739 }
 740
 741 /************************************************************************
 742  *                              MISC                                    *
 743  ************************************************************************
 744  */
 745
 746 static int
 747 hammer_setup_device(struct vnode **devvpp, const char *dev_path, int ronly)
 748 {
 749         int error;
 750         struct nlookupdata nd;
 751
 752         /*
 753          * Get the device vnode
 754          */
 755         if (*devvpp == NULL) {
 756                 error = nlookup_init(&nd, dev_path, UIO_SYSSPACE, NLC_FOLLOW);
 757                 if (error == 0)
 758                         error = nlookup(&nd);
 759                 if (error == 0)
 760                         error = cache_vref(&nd.nl_nch, nd.nl_cred, devvpp);
 761                 nlookup_done(&nd);
 762         } else {
 763                 error = 0;
 764         }
 765
 766         if (error == 0) {
 767                 if (vn_isdisk(*devvpp, &error)) {
 768                         error = vfs_mountedon(*devvpp);
 769                 }
 770         }
 771         if (error == 0 && vcount(*devvpp) > 0)
 772                 error = EBUSY;
 773         if (error == 0) {
 774                 vn_lock(*devvpp, LK_EXCLUSIVE | LK_RETRY);
 775                 error = vinvalbuf(*devvpp, V_SAVE, 0, 0);
 776                 if (error == 0) {
 777                         error = VOP_OPEN(*devvpp,
 778                                          (ronly ? FREAD : FREAD|FWRITE),
 779                                          FSCRED, NULL);
 780                 }
 781                 vn_unlock(*devvpp);
 782         }
 783         if (error && *devvpp) {
 784                 vrele(*devvpp);
 785                 *devvpp = NULL;
 786         }
 787         return (error);
 788 }
 789
 790 static void
 791 hammer_close_device(struct vnode **devvpp, int ronly)
 792 {
 793         if (*devvpp) {
 794                 vn_lock(*devvpp, LK_EXCLUSIVE | LK_RETRY);
 795                 vinvalbuf(*devvpp, ronly ? 0 : V_SAVE, 0, 0);
 796                 VOP_CLOSE(*devvpp, (ronly ? FREAD : FREAD|FWRITE), NULL);
 797                 vn_unlock(*devvpp);
 798                 vrele(*devvpp);
 799                 *devvpp = NULL;
 800         }
 801 }
 802
 803 static int
 804 hammer_format_volume_header(struct hammer_mount *hmp, struct vnode *devvp,
 805         const char *vol_name, int vol_no, int vol_count,
 806         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size)
 807 {
 808         struct buf *bp = NULL;
 809         struct hammer_volume_ondisk *ondisk;
 810         int error;
 811
 812         /*
 813          * Extract the volume number from the volume header and do various
 814          * sanity checks.
 815          */
 816         KKASSERT(HAMMER_BUFSIZE >= sizeof(struct hammer_volume_ondisk));
 817         error = bread(devvp, 0LL, HAMMER_BUFSIZE, &bp);
 818         if (error || bp->b_bcount < sizeof(struct hammer_volume_ondisk))
 819                 goto late_failure;
 820
 821         ondisk = (struct hammer_volume_ondisk*) bp->b_data;
 822
 823         /*
 824          * Note that we do NOT allow to use a device that contains
 825          * a valid HAMMER signature. It has to be cleaned up with dd
 826          * before.
 827          */
 828         if (ondisk->vol_signature == HAMMER_FSBUF_VOLUME) {
 829                 kprintf("hammer_volume_add: Formatting of valid HAMMER volume "
 830                         "%s denied. Erase with dd!\n", vol_name);
 831                 error = EFTYPE;
 832                 goto late_failure;
 833         }
 834
 835         bzero(ondisk, sizeof(struct hammer_volume_ondisk));
 836         ksnprintf(ondisk->vol_name, sizeof(ondisk->vol_name), "%s", vol_name);
 837         ondisk->vol_fstype = hmp->rootvol->ondisk->vol_fstype;
 838         ondisk->vol_signature = HAMMER_FSBUF_VOLUME;
 839         ondisk->vol_fsid = hmp->fsid;
 840         ondisk->vol_rootvol = hmp->rootvol->vol_no;
 841         ondisk->vol_no = vol_no;
 842         ondisk->vol_count = vol_count;
 843         ondisk->vol_version = hmp->version;
 844
 845         /*
 846          * Reserve space for (future) header junk, setup our poor-man's
 847          * bigblock allocator.
 848          */
 849         int64_t vol_alloc = HAMMER_BUFSIZE * 16;
 850
 851         ondisk->vol_bot_beg = vol_alloc;
 852         vol_alloc += boot_area_size;
 853         ondisk->vol_mem_beg = vol_alloc;
 854         vol_alloc += mem_area_size;
 855
 856         /*
 857          * The remaining area is the zone 2 buffer allocation area.  These
 858          * buffers
 859          */
 860         ondisk->vol_buf_beg = vol_alloc;
 861         ondisk->vol_buf_end = vol_size & ~(int64_t)HAMMER_BUFMASK;
 862
 863         if (ondisk->vol_buf_end < ondisk->vol_buf_beg) {
 864                 kprintf("volume %d %s is too small to hold the volume header",
 865                      ondisk->vol_no, ondisk->vol_name);
 866                 error = EFTYPE;
 867                 goto late_failure;
 868         }
 869
 870         ondisk->vol_nblocks = (ondisk->vol_buf_end - ondisk->vol_buf_beg) /
 871                               HAMMER_BUFSIZE;
 872         ondisk->vol_blocksize = HAMMER_BUFSIZE;
 873
 874         /*
 875          * Write volume header to disk
 876          */
 877         error = bwrite(bp);
 878         bp = NULL;
 879
 880 late_failure:
 881         if (bp)
 882                 brelse(bp);
 883         return (error);
 884 }
 885
 886 /*
 887  * Invalidates the volume header. Used by volume-del.
 888  */
 889 static int
 890 hammer_clear_volume_header(struct vnode *devvp)
 891 {
 892         struct buf *bp = NULL;
 893         struct hammer_volume_ondisk *ondisk;
 894         int error;
 895
 896         KKASSERT(HAMMER_BUFSIZE >= sizeof(struct hammer_volume_ondisk));
 897         error = bread(devvp, 0LL, HAMMER_BUFSIZE, &bp);
 898         if (error || bp->b_bcount < sizeof(struct hammer_volume_ondisk))
 899                 goto late_failure;
 900
 901         ondisk = (struct hammer_volume_ondisk*) bp->b_data;
 902         bzero(ondisk, sizeof(struct hammer_volume_ondisk));
 903
 904         error = bwrite(bp);
 905         bp = NULL;
 906
 907 late_failure:
 908         if (bp)
 909                 brelse(bp);
 910         return (error);
 911 }