2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <vm/vm_page2.h>
42 static int hammer_res_rb_compare(hammer_reserve_t res1, hammer_reserve_t res2);
43 static void hammer_reserve_setdelay_offset(hammer_mount_t hmp,
44 hammer_off_t base_offset, int zone,
45 struct hammer_blockmap_layer2 *layer2);
46 static void hammer_reserve_setdelay(hammer_mount_t hmp, hammer_reserve_t resv);
47 static int update_bytes_free(hammer_reserve_t resv, int bytes);
48 static int hammer_check_volume(hammer_mount_t, hammer_off_t*);
49 static void hammer_skip_volume(hammer_off_t *offsetp);
52 * Reserved big-blocks red-black tree support
54 RB_GENERATE2(hammer_res_rb_tree, hammer_reserve, rb_node,
55 hammer_res_rb_compare, hammer_off_t, zone_offset);
58 hammer_res_rb_compare(hammer_reserve_t res1, hammer_reserve_t res2)
60 if (res1->zone_offset < res2->zone_offset)
62 if (res1->zone_offset > res2->zone_offset)
68 * Allocate bytes from a zone
71 hammer_blockmap_alloc(hammer_transaction_t trans, int zone, int bytes,
72 hammer_off_t hint, int *errorp)
75 hammer_volume_t root_volume;
76 hammer_blockmap_t blockmap;
77 hammer_blockmap_t freemap;
78 hammer_reserve_t resv;
79 struct hammer_blockmap_layer1 *layer1;
80 struct hammer_blockmap_layer2 *layer2;
81 hammer_buffer_t buffer1 = NULL;
82 hammer_buffer_t buffer2 = NULL;
83 hammer_buffer_t buffer3 = NULL;
84 hammer_off_t tmp_offset;
85 hammer_off_t next_offset;
86 hammer_off_t result_offset;
87 hammer_off_t layer1_offset;
88 hammer_off_t layer2_offset;
89 hammer_off_t base_off;
91 int offset; /* offset within big-block */
97 * Deal with alignment and buffer-boundary issues.
99 * Be careful, certain primary alignments are used below to allocate
100 * new blockmap blocks.
102 bytes = (bytes + 15) & ~15;
103 KKASSERT(bytes > 0 && bytes <= HAMMER_XBUFSIZE);
104 KKASSERT(hammer_is_zone2_mapped_index(zone));
109 root_volume = trans->rootvol;
111 blockmap = &hmp->blockmap[zone];
112 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
113 KKASSERT(HAMMER_ZONE_DECODE(blockmap->next_offset) == zone);
116 * Use the hint if we have one.
118 if (hint && HAMMER_ZONE_DECODE(hint) == zone) {
119 next_offset = (hint + 15) & ~(hammer_off_t)15;
122 next_offset = blockmap->next_offset;
128 * use_hint is turned off if we leave the hinted big-block.
130 if (use_hint && ((next_offset ^ hint) & ~HAMMER_HINTBLOCK_MASK64)) {
131 next_offset = blockmap->next_offset;
138 if (next_offset == HAMMER_ZONE_ENCODE(zone + 1, 0)) {
144 next_offset = HAMMER_ZONE_ENCODE(zone, 0);
148 * The allocation request may not cross a buffer boundary. Special
149 * large allocations must not cross a big-block boundary.
151 tmp_offset = next_offset + bytes - 1;
152 if (bytes <= HAMMER_BUFSIZE) {
153 if ((next_offset ^ tmp_offset) & ~HAMMER_BUFMASK64) {
154 next_offset = tmp_offset & ~HAMMER_BUFMASK64;
158 if ((next_offset ^ tmp_offset) & ~HAMMER_BIGBLOCK_MASK64) {
159 next_offset = tmp_offset & ~HAMMER_BIGBLOCK_MASK64;
163 offset = (int)next_offset & HAMMER_BIGBLOCK_MASK;
168 layer1_offset = freemap->phys_offset +
169 HAMMER_BLOCKMAP_LAYER1_OFFSET(next_offset);
171 layer1 = hammer_bread(hmp, layer1_offset, errorp, &buffer1);
180 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
181 hammer_lock_ex(&hmp->blkmap_lock);
182 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
183 hpanic("CRC FAILED: LAYER1");
184 hammer_unlock(&hmp->blkmap_lock);
188 * If we are at a big-block boundary and layer1 indicates no
189 * free big-blocks, then we cannot allocate a new big-block in
190 * layer2, skip to the next layer1 entry.
192 if (offset == 0 && layer1->blocks_free == 0) {
193 next_offset = (next_offset + HAMMER_BLOCKMAP_LAYER2) &
194 ~HAMMER_BLOCKMAP_LAYER2_MASK;
195 if (hammer_check_volume(hmp, &next_offset)) {
201 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
204 * Skip the whole volume if it is pointing to a layer2 big-block
205 * on a volume that we are currently trying to remove from the
206 * file-system. This is used by the volume-del code together with
207 * the reblocker to free up a volume.
209 if (HAMMER_VOL_DECODE(layer1->phys_offset) == hmp->volume_to_remove) {
210 hammer_skip_volume(&next_offset);
215 * Dive layer 2, each entry represents a big-block.
217 layer2_offset = layer1->phys_offset +
218 HAMMER_BLOCKMAP_LAYER2_OFFSET(next_offset);
219 layer2 = hammer_bread(hmp, layer2_offset, errorp, &buffer2);
226 * Check CRC. This can race another thread holding the lock
227 * and in the middle of modifying layer2.
229 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
230 hammer_lock_ex(&hmp->blkmap_lock);
231 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
232 hpanic("CRC FAILED: LAYER2");
233 hammer_unlock(&hmp->blkmap_lock);
237 * Skip the layer if the zone is owned by someone other then us.
239 if (layer2->zone && layer2->zone != zone) {
240 next_offset += (HAMMER_BIGBLOCK_SIZE - offset);
243 if (offset < layer2->append_off) {
244 next_offset += layer2->append_off - offset;
250 * If operating in the current non-hint blockmap block, do not
251 * allow it to get over-full. Also drop any active hinting so
252 * blockmap->next_offset is updated at the end.
254 * We do this for B-Tree and meta-data allocations to provide
255 * localization for updates.
257 if ((zone == HAMMER_ZONE_BTREE_INDEX ||
258 zone == HAMMER_ZONE_META_INDEX) &&
259 offset >= HAMMER_BIGBLOCK_OVERFILL &&
260 !((next_offset ^ blockmap->next_offset) & ~HAMMER_BIGBLOCK_MASK64)) {
261 if (offset >= HAMMER_BIGBLOCK_OVERFILL) {
262 next_offset += (HAMMER_BIGBLOCK_SIZE - offset);
270 * We need the lock from this point on. We have to re-check zone
271 * ownership after acquiring the lock and also check for reservations.
273 hammer_lock_ex(&hmp->blkmap_lock);
275 if (layer2->zone && layer2->zone != zone) {
276 hammer_unlock(&hmp->blkmap_lock);
277 next_offset += (HAMMER_BIGBLOCK_SIZE - offset);
280 if (offset < layer2->append_off) {
281 hammer_unlock(&hmp->blkmap_lock);
282 next_offset += layer2->append_off - offset;
287 * The big-block might be reserved by another zone. If it is reserved
288 * by our zone we may have to move next_offset past the append_off.
290 base_off = hammer_xlate_to_zone2(next_offset &
291 ~HAMMER_BIGBLOCK_MASK64);
292 resv = RB_LOOKUP(hammer_res_rb_tree, &hmp->rb_resv_root, base_off);
294 if (resv->zone != zone) {
295 hammer_unlock(&hmp->blkmap_lock);
296 next_offset = (next_offset + HAMMER_BIGBLOCK_SIZE) &
297 ~HAMMER_BIGBLOCK_MASK64;
300 if (offset < resv->append_off) {
301 hammer_unlock(&hmp->blkmap_lock);
302 next_offset += resv->append_off - offset;
309 * Ok, we can allocate out of this layer2 big-block. Assume ownership
310 * of the layer for real. At this point we've validated any
311 * reservation that might exist and can just ignore resv.
313 if (layer2->zone == 0) {
315 * Assign the big-block to our zone
317 hammer_modify_buffer(trans, buffer1, layer1, sizeof(*layer1));
318 --layer1->blocks_free;
319 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
320 hammer_modify_buffer_done(buffer1);
321 hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
323 KKASSERT(layer2->bytes_free == HAMMER_BIGBLOCK_SIZE);
324 KKASSERT(layer2->append_off == 0);
325 hammer_modify_volume_field(trans, trans->rootvol,
326 vol0_stat_freebigblocks);
327 --root_volume->ondisk->vol0_stat_freebigblocks;
328 hmp->copy_stat_freebigblocks =
329 root_volume->ondisk->vol0_stat_freebigblocks;
330 hammer_modify_volume_done(trans->rootvol);
332 hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
334 KKASSERT(layer2->zone == zone);
337 * NOTE: bytes_free can legally go negative due to de-dup.
339 layer2->bytes_free -= bytes;
340 KKASSERT(layer2->append_off <= offset);
341 layer2->append_off = offset + bytes;
342 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
343 hammer_modify_buffer_done(buffer2);
346 * We hold the blockmap lock and should be the only ones
347 * capable of modifying resv->append_off. Track the allocation
350 KKASSERT(bytes != 0);
352 KKASSERT(resv->append_off <= offset);
353 resv->append_off = offset + bytes;
354 resv->flags &= ~HAMMER_RESF_LAYER2FREE;
355 hammer_blockmap_reserve_complete(hmp, resv);
359 * If we are allocating from the base of a new buffer we can avoid
360 * a disk read by calling hammer_bnew_ext().
362 if ((next_offset & HAMMER_BUFMASK) == 0) {
363 hammer_bnew_ext(trans->hmp, next_offset, bytes,
370 result_offset = next_offset;
373 * If we weren't supplied with a hint or could not use the hint
374 * then we wound up using blockmap->next_offset as the hint and
378 hammer_modify_volume_noundo(NULL, root_volume);
379 blockmap->next_offset = next_offset + bytes;
380 hammer_modify_volume_done(root_volume);
382 hammer_unlock(&hmp->blkmap_lock);
389 hammer_rel_buffer(buffer1, 0);
391 hammer_rel_buffer(buffer2, 0);
393 hammer_rel_buffer(buffer3, 0);
395 return(result_offset);
399 * Frontend function - Reserve bytes in a zone.
401 * This code reserves bytes out of a blockmap without committing to any
402 * meta-data modifications, allowing the front-end to directly issue disk
403 * write I/O for big-blocks of data
405 * The backend later finalizes the reservation with hammer_blockmap_finalize()
406 * upon committing the related record.
409 hammer_blockmap_reserve(hammer_mount_t hmp, int zone, int bytes,
410 hammer_off_t *zone_offp, int *errorp)
412 hammer_volume_t root_volume;
413 hammer_blockmap_t blockmap;
414 hammer_blockmap_t freemap;
415 struct hammer_blockmap_layer1 *layer1;
416 struct hammer_blockmap_layer2 *layer2;
417 hammer_buffer_t buffer1 = NULL;
418 hammer_buffer_t buffer2 = NULL;
419 hammer_buffer_t buffer3 = NULL;
420 hammer_off_t tmp_offset;
421 hammer_off_t next_offset;
422 hammer_off_t layer1_offset;
423 hammer_off_t layer2_offset;
424 hammer_off_t base_off;
425 hammer_reserve_t resv;
426 hammer_reserve_t resx;
433 KKASSERT(hammer_is_zone2_mapped_index(zone));
434 root_volume = hammer_get_root_volume(hmp, errorp);
437 blockmap = &hmp->blockmap[zone];
438 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
439 KKASSERT(HAMMER_ZONE_DECODE(blockmap->next_offset) == zone);
442 * Deal with alignment and buffer-boundary issues.
444 * Be careful, certain primary alignments are used below to allocate
445 * new blockmap blocks.
447 bytes = (bytes + 15) & ~15;
448 KKASSERT(bytes > 0 && bytes <= HAMMER_XBUFSIZE);
450 next_offset = blockmap->next_offset;
456 if (next_offset == HAMMER_ZONE_ENCODE(zone + 1, 0)) {
461 next_offset = HAMMER_ZONE_ENCODE(zone, 0);
465 * The allocation request may not cross a buffer boundary. Special
466 * large allocations must not cross a big-block boundary.
468 tmp_offset = next_offset + bytes - 1;
469 if (bytes <= HAMMER_BUFSIZE) {
470 if ((next_offset ^ tmp_offset) & ~HAMMER_BUFMASK64) {
471 next_offset = tmp_offset & ~HAMMER_BUFMASK64;
475 if ((next_offset ^ tmp_offset) & ~HAMMER_BIGBLOCK_MASK64) {
476 next_offset = tmp_offset & ~HAMMER_BIGBLOCK_MASK64;
480 offset = (int)next_offset & HAMMER_BIGBLOCK_MASK;
485 layer1_offset = freemap->phys_offset +
486 HAMMER_BLOCKMAP_LAYER1_OFFSET(next_offset);
487 layer1 = hammer_bread(hmp, layer1_offset, errorp, &buffer1);
494 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
495 hammer_lock_ex(&hmp->blkmap_lock);
496 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
497 hpanic("CRC FAILED: LAYER1");
498 hammer_unlock(&hmp->blkmap_lock);
502 * If we are at a big-block boundary and layer1 indicates no
503 * free big-blocks, then we cannot allocate a new big-block in
504 * layer2, skip to the next layer1 entry.
506 if ((next_offset & HAMMER_BIGBLOCK_MASK) == 0 &&
507 layer1->blocks_free == 0) {
508 next_offset = (next_offset + HAMMER_BLOCKMAP_LAYER2) &
509 ~HAMMER_BLOCKMAP_LAYER2_MASK;
510 if (hammer_check_volume(hmp, &next_offset))
514 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
517 * Dive layer 2, each entry represents a big-block.
519 layer2_offset = layer1->phys_offset +
520 HAMMER_BLOCKMAP_LAYER2_OFFSET(next_offset);
521 layer2 = hammer_bread(hmp, layer2_offset, errorp, &buffer2);
526 * Check CRC if not allocating into uninitialized space (which we
527 * aren't when reserving space).
529 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
530 hammer_lock_ex(&hmp->blkmap_lock);
531 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
532 hpanic("CRC FAILED: LAYER2");
533 hammer_unlock(&hmp->blkmap_lock);
537 * Skip the layer if the zone is owned by someone other then us.
539 if (layer2->zone && layer2->zone != zone) {
540 next_offset += (HAMMER_BIGBLOCK_SIZE - offset);
543 if (offset < layer2->append_off) {
544 next_offset += layer2->append_off - offset;
549 * We need the lock from this point on. We have to re-check zone
550 * ownership after acquiring the lock and also check for reservations.
552 hammer_lock_ex(&hmp->blkmap_lock);
554 if (layer2->zone && layer2->zone != zone) {
555 hammer_unlock(&hmp->blkmap_lock);
556 next_offset += (HAMMER_BIGBLOCK_SIZE - offset);
559 if (offset < layer2->append_off) {
560 hammer_unlock(&hmp->blkmap_lock);
561 next_offset += layer2->append_off - offset;
566 * The big-block might be reserved by another zone. If it is reserved
567 * by our zone we may have to move next_offset past the append_off.
569 base_off = hammer_xlate_to_zone2(next_offset &
570 ~HAMMER_BIGBLOCK_MASK64);
571 resv = RB_LOOKUP(hammer_res_rb_tree, &hmp->rb_resv_root, base_off);
573 if (resv->zone != zone) {
574 hammer_unlock(&hmp->blkmap_lock);
575 next_offset = (next_offset + HAMMER_BIGBLOCK_SIZE) &
576 ~HAMMER_BIGBLOCK_MASK64;
579 if (offset < resv->append_off) {
580 hammer_unlock(&hmp->blkmap_lock);
581 next_offset += resv->append_off - offset;
587 resx = kmalloc(sizeof(*resv), hmp->m_misc,
588 M_WAITOK | M_ZERO | M_USE_RESERVE);
591 resx->zone_offset = base_off;
592 if (layer2->bytes_free == HAMMER_BIGBLOCK_SIZE)
593 resx->flags |= HAMMER_RESF_LAYER2FREE;
594 resv = RB_INSERT(hammer_res_rb_tree, &hmp->rb_resv_root, resx);
595 KKASSERT(resv == NULL);
597 ++hammer_count_reservations;
599 resv->append_off = offset + bytes;
602 * If we are not reserving a whole buffer but are at the start of
603 * a new block, call hammer_bnew() to avoid a disk read.
605 * If we are reserving a whole buffer (or more), the caller will
606 * probably use a direct read, so do nothing.
608 * If we do not have a whole lot of system memory we really can't
609 * afford to block while holding the blkmap_lock!
611 if (bytes < HAMMER_BUFSIZE && (next_offset & HAMMER_BUFMASK) == 0) {
612 if (!vm_page_count_min(HAMMER_BUFSIZE / PAGE_SIZE)) {
613 hammer_bnew(hmp, next_offset, errorp, &buffer3);
620 * Adjust our iterator and alloc_offset. The layer1 and layer2
621 * space beyond alloc_offset is uninitialized. alloc_offset must
622 * be big-block aligned.
624 blockmap->next_offset = next_offset + bytes;
625 hammer_unlock(&hmp->blkmap_lock);
629 hammer_rel_buffer(buffer1, 0);
631 hammer_rel_buffer(buffer2, 0);
633 hammer_rel_buffer(buffer3, 0);
634 hammer_rel_volume(root_volume, 0);
635 *zone_offp = next_offset;
641 * Frontend function - Dedup bytes in a zone.
643 * Dedup reservations work exactly the same as normal write reservations
644 * except we only adjust bytes_free field and don't touch append offset.
645 * Finalization mechanic for dedup reservations is also the same as for
646 * normal write ones - the backend finalizes the reservation with
647 * hammer_blockmap_finalize().
650 hammer_blockmap_reserve_dedup(hammer_mount_t hmp, int zone, int bytes,
651 hammer_off_t zone_offset, int *errorp)
653 hammer_volume_t root_volume;
654 hammer_blockmap_t freemap;
655 struct hammer_blockmap_layer1 *layer1;
656 struct hammer_blockmap_layer2 *layer2;
657 hammer_buffer_t buffer1 = NULL;
658 hammer_buffer_t buffer2 = NULL;
659 hammer_off_t layer1_offset;
660 hammer_off_t layer2_offset;
661 hammer_off_t base_off;
662 hammer_reserve_t resv = NULL;
663 hammer_reserve_t resx = NULL;
668 KKASSERT(hammer_is_zone2_mapped_index(zone));
669 root_volume = hammer_get_root_volume(hmp, errorp);
672 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
673 KKASSERT(freemap->phys_offset != 0);
675 bytes = (bytes + 15) & ~15;
676 KKASSERT(bytes > 0 && bytes <= HAMMER_XBUFSIZE);
681 layer1_offset = freemap->phys_offset +
682 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
683 layer1 = hammer_bread(hmp, layer1_offset, errorp, &buffer1);
690 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
691 hammer_lock_ex(&hmp->blkmap_lock);
692 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
693 hpanic("CRC FAILED: LAYER1");
694 hammer_unlock(&hmp->blkmap_lock);
696 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
699 * Dive layer 2, each entry represents a big-block.
701 layer2_offset = layer1->phys_offset +
702 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
703 layer2 = hammer_bread(hmp, layer2_offset, errorp, &buffer2);
710 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
711 hammer_lock_ex(&hmp->blkmap_lock);
712 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
713 hpanic("CRC FAILED: LAYER2");
714 hammer_unlock(&hmp->blkmap_lock);
718 * Fail if the zone is owned by someone other than us.
720 if (layer2->zone && layer2->zone != zone)
724 * We need the lock from this point on. We have to re-check zone
725 * ownership after acquiring the lock and also check for reservations.
727 hammer_lock_ex(&hmp->blkmap_lock);
729 if (layer2->zone && layer2->zone != zone) {
730 hammer_unlock(&hmp->blkmap_lock);
734 base_off = hammer_xlate_to_zone2(zone_offset &
735 ~HAMMER_BIGBLOCK_MASK64);
736 resv = RB_LOOKUP(hammer_res_rb_tree, &hmp->rb_resv_root, base_off);
738 if (resv->zone != zone) {
739 hammer_unlock(&hmp->blkmap_lock);
744 * Due to possible big-block underflow we can't simply
745 * subtract bytes from bytes_free.
747 if (update_bytes_free(resv, bytes) == 0) {
748 hammer_unlock(&hmp->blkmap_lock);
755 resx = kmalloc(sizeof(*resv), hmp->m_misc,
756 M_WAITOK | M_ZERO | M_USE_RESERVE);
759 resx->bytes_free = layer2->bytes_free;
761 * Due to possible big-block underflow we can't simply
762 * subtract bytes from bytes_free.
764 if (update_bytes_free(resx, bytes) == 0) {
765 hammer_unlock(&hmp->blkmap_lock);
766 kfree(resx, hmp->m_misc);
769 resx->zone_offset = base_off;
770 resv = RB_INSERT(hammer_res_rb_tree, &hmp->rb_resv_root, resx);
771 KKASSERT(resv == NULL);
773 ++hammer_count_reservations;
776 hammer_unlock(&hmp->blkmap_lock);
780 hammer_rel_buffer(buffer1, 0);
782 hammer_rel_buffer(buffer2, 0);
783 hammer_rel_volume(root_volume, 0);
789 update_bytes_free(hammer_reserve_t resv, int bytes)
794 * Big-block underflow check
796 temp = resv->bytes_free - HAMMER_BIGBLOCK_SIZE * 2;
797 cpu_ccfence(); /* XXX do we really need it ? */
798 if (temp > resv->bytes_free) {
799 hdkprintf("BIGBLOCK UNDERFLOW\n");
803 resv->bytes_free -= bytes;
808 * Dereference a reservation structure. Upon the final release the
809 * underlying big-block is checked and if it is entirely free we delete
810 * any related HAMMER buffers to avoid potential conflicts with future
811 * reuse of the big-block.
814 hammer_blockmap_reserve_complete(hammer_mount_t hmp, hammer_reserve_t resv)
816 hammer_off_t base_offset;
819 KKASSERT(resv->refs > 0);
820 KKASSERT(hammer_is_zone_raw_buffer(resv->zone_offset));
823 * Setting append_off to the max prevents any new allocations
824 * from occuring while we are trying to dispose of the reservation,
825 * allowing us to safely delete any related HAMMER buffers.
827 * If we are unable to clean out all related HAMMER buffers we
830 if (resv->refs == 1 && (resv->flags & HAMMER_RESF_LAYER2FREE)) {
831 resv->append_off = HAMMER_BIGBLOCK_SIZE;
832 base_offset = hammer_xlate_to_zoneX(resv->zone, resv->zone_offset);
833 if (!TAILQ_EMPTY(&hmp->dedup_lru_list))
834 hammer_dedup_cache_inval(hmp, base_offset);
835 error = hammer_del_buffers(hmp, base_offset,
837 HAMMER_BIGBLOCK_SIZE,
839 if (hammer_debug_general & 0x20000) {
840 hkprintf("delbgblk %016jx error %d\n",
841 (intmax_t)base_offset, error);
844 hammer_reserve_setdelay(hmp, resv);
846 if (--resv->refs == 0) {
847 if (hammer_debug_general & 0x20000) {
848 hkprintf("delresvr %016jx zone %02x\n",
849 (intmax_t)resv->zone_offset, resv->zone);
851 KKASSERT((resv->flags & HAMMER_RESF_ONDELAY) == 0);
852 RB_REMOVE(hammer_res_rb_tree, &hmp->rb_resv_root, resv);
853 kfree(resv, hmp->m_misc);
854 --hammer_count_reservations;
859 * Prevent a potentially free big-block from being reused until after
860 * the related flushes have completely cycled, otherwise crash recovery
861 * could resurrect a data block that was already reused and overwritten.
863 * The caller might reset the underlying layer2 entry's append_off to 0, so
864 * our covering append_off must be set to max to prevent any reallocation
865 * until after the flush delays complete, not to mention proper invalidation
866 * of any underlying cached blocks.
869 hammer_reserve_setdelay_offset(hammer_mount_t hmp, hammer_off_t base_offset,
870 int zone, struct hammer_blockmap_layer2 *layer2)
872 hammer_reserve_t resv;
875 * Allocate the reservation if necessary.
877 * NOTE: need lock in future around resv lookup/allocation and
878 * the setdelay call, currently refs is not bumped until the call.
881 resv = RB_LOOKUP(hammer_res_rb_tree, &hmp->rb_resv_root, base_offset);
883 resv = kmalloc(sizeof(*resv), hmp->m_misc,
884 M_WAITOK | M_ZERO | M_USE_RESERVE);
886 resv->zone_offset = base_offset;
888 resv->append_off = HAMMER_BIGBLOCK_SIZE;
890 if (layer2->bytes_free == HAMMER_BIGBLOCK_SIZE)
891 resv->flags |= HAMMER_RESF_LAYER2FREE;
892 if (RB_INSERT(hammer_res_rb_tree, &hmp->rb_resv_root, resv)) {
893 kfree(resv, hmp->m_misc);
896 ++hammer_count_reservations;
898 if (layer2->bytes_free == HAMMER_BIGBLOCK_SIZE)
899 resv->flags |= HAMMER_RESF_LAYER2FREE;
901 hammer_reserve_setdelay(hmp, resv);
905 * Enter the reservation on the on-delay list, or move it if it
906 * is already on the list.
909 hammer_reserve_setdelay(hammer_mount_t hmp, hammer_reserve_t resv)
911 if (resv->flags & HAMMER_RESF_ONDELAY) {
912 TAILQ_REMOVE(&hmp->delay_list, resv, delay_entry);
913 resv->flg_no = hmp->flusher.next + 1;
914 TAILQ_INSERT_TAIL(&hmp->delay_list, resv, delay_entry);
917 ++hmp->rsv_fromdelay;
918 resv->flags |= HAMMER_RESF_ONDELAY;
919 resv->flg_no = hmp->flusher.next + 1;
920 TAILQ_INSERT_TAIL(&hmp->delay_list, resv, delay_entry);
925 * Reserve has reached its flush point, remove it from the delay list
926 * and finish it off. hammer_blockmap_reserve_complete() inherits
927 * the ondelay reference.
930 hammer_reserve_clrdelay(hammer_mount_t hmp, hammer_reserve_t resv)
932 KKASSERT(resv->flags & HAMMER_RESF_ONDELAY);
933 resv->flags &= ~HAMMER_RESF_ONDELAY;
934 TAILQ_REMOVE(&hmp->delay_list, resv, delay_entry);
935 --hmp->rsv_fromdelay;
936 hammer_blockmap_reserve_complete(hmp, resv);
940 * Backend function - free (offset, bytes) in a zone.
945 hammer_blockmap_free(hammer_transaction_t trans,
946 hammer_off_t zone_offset, int bytes)
949 hammer_volume_t root_volume;
950 hammer_blockmap_t freemap;
951 struct hammer_blockmap_layer1 *layer1;
952 struct hammer_blockmap_layer2 *layer2;
953 hammer_buffer_t buffer1 = NULL;
954 hammer_buffer_t buffer2 = NULL;
955 hammer_off_t layer1_offset;
956 hammer_off_t layer2_offset;
957 hammer_off_t base_off;
968 bytes = (bytes + 15) & ~15;
969 KKASSERT(bytes <= HAMMER_XBUFSIZE);
970 KKASSERT(((zone_offset ^ (zone_offset + (bytes - 1))) &
971 ~HAMMER_BIGBLOCK_MASK64) == 0);
974 * Basic zone validation & locking
976 zone = HAMMER_ZONE_DECODE(zone_offset);
977 KKASSERT(hammer_is_zone2_mapped_index(zone));
978 root_volume = trans->rootvol;
981 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
986 layer1_offset = freemap->phys_offset +
987 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
988 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
991 KKASSERT(layer1->phys_offset &&
992 layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
993 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
994 hammer_lock_ex(&hmp->blkmap_lock);
995 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
996 hpanic("CRC FAILED: LAYER1");
997 hammer_unlock(&hmp->blkmap_lock);
1001 * Dive layer 2, each entry represents a big-block.
1003 layer2_offset = layer1->phys_offset +
1004 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
1005 layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
1008 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
1009 hammer_lock_ex(&hmp->blkmap_lock);
1010 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
1011 hpanic("CRC FAILED: LAYER2");
1012 hammer_unlock(&hmp->blkmap_lock);
1015 hammer_lock_ex(&hmp->blkmap_lock);
1017 hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
1020 * Free space previously allocated via blockmap_alloc().
1022 * NOTE: bytes_free can be and remain negative due to de-dup ops
1023 * but can never become larger than HAMMER_BIGBLOCK_SIZE.
1025 KKASSERT(layer2->zone == zone);
1026 layer2->bytes_free += bytes;
1027 KKASSERT(layer2->bytes_free <= HAMMER_BIGBLOCK_SIZE);
1030 * If a big-block becomes entirely free we must create a covering
1031 * reservation to prevent premature reuse. Note, however, that
1032 * the big-block and/or reservation may still have an append_off
1033 * that allows further (non-reused) allocations.
1035 * Once the reservation has been made we re-check layer2 and if
1036 * the big-block is still entirely free we reset the layer2 entry.
1037 * The reservation will prevent premature reuse.
1039 * NOTE: hammer_buffer's are only invalidated when the reservation
1040 * is completed, if the layer2 entry is still completely free at
1041 * that time. Any allocations from the reservation that may have
1042 * occured in the mean time, or active references on the reservation
1043 * from new pending allocations, will prevent the invalidation from
1046 if (layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
1047 base_off = hammer_xlate_to_zone2(zone_offset &
1048 ~HAMMER_BIGBLOCK_MASK64);
1050 hammer_reserve_setdelay_offset(hmp, base_off, zone, layer2);
1051 if (layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
1053 layer2->append_off = 0;
1054 hammer_modify_buffer(trans, buffer1,
1055 layer1, sizeof(*layer1));
1056 ++layer1->blocks_free;
1057 layer1->layer1_crc = crc32(layer1,
1058 HAMMER_LAYER1_CRCSIZE);
1059 hammer_modify_buffer_done(buffer1);
1060 hammer_modify_volume_field(trans,
1062 vol0_stat_freebigblocks);
1063 ++root_volume->ondisk->vol0_stat_freebigblocks;
1064 hmp->copy_stat_freebigblocks =
1065 root_volume->ondisk->vol0_stat_freebigblocks;
1066 hammer_modify_volume_done(trans->rootvol);
1069 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
1070 hammer_modify_buffer_done(buffer2);
1071 hammer_unlock(&hmp->blkmap_lock);
1075 hammer_rel_buffer(buffer1, 0);
1077 hammer_rel_buffer(buffer2, 0);
1081 hammer_blockmap_dedup(hammer_transaction_t trans,
1082 hammer_off_t zone_offset, int bytes)
1085 hammer_blockmap_t freemap;
1086 struct hammer_blockmap_layer1 *layer1;
1087 struct hammer_blockmap_layer2 *layer2;
1088 hammer_buffer_t buffer1 = NULL;
1089 hammer_buffer_t buffer2 = NULL;
1090 hammer_off_t layer1_offset;
1091 hammer_off_t layer2_offset;
1094 int zone __debugvar;
1103 bytes = (bytes + 15) & ~15;
1104 KKASSERT(bytes <= HAMMER_BIGBLOCK_SIZE);
1105 KKASSERT(((zone_offset ^ (zone_offset + (bytes - 1))) &
1106 ~HAMMER_BIGBLOCK_MASK64) == 0);
1109 * Basic zone validation & locking
1111 zone = HAMMER_ZONE_DECODE(zone_offset);
1112 KKASSERT(hammer_is_zone2_mapped_index(zone));
1115 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
1120 layer1_offset = freemap->phys_offset +
1121 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
1122 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
1125 KKASSERT(layer1->phys_offset &&
1126 layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
1127 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
1128 hammer_lock_ex(&hmp->blkmap_lock);
1129 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
1130 hpanic("CRC FAILED: LAYER1");
1131 hammer_unlock(&hmp->blkmap_lock);
1135 * Dive layer 2, each entry represents a big-block.
1137 layer2_offset = layer1->phys_offset +
1138 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
1139 layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
1142 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
1143 hammer_lock_ex(&hmp->blkmap_lock);
1144 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
1145 hpanic("CRC FAILED: LAYER2");
1146 hammer_unlock(&hmp->blkmap_lock);
1149 hammer_lock_ex(&hmp->blkmap_lock);
1151 hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
1154 * Free space previously allocated via blockmap_alloc().
1156 * NOTE: bytes_free can be and remain negative due to de-dup ops
1157 * but can never become larger than HAMMER_BIGBLOCK_SIZE.
1159 KKASSERT(layer2->zone == zone);
1160 temp = layer2->bytes_free - HAMMER_BIGBLOCK_SIZE * 2;
1161 cpu_ccfence(); /* prevent gcc from optimizing temp out */
1162 if (temp > layer2->bytes_free) {
1166 layer2->bytes_free -= bytes;
1168 KKASSERT(layer2->bytes_free <= HAMMER_BIGBLOCK_SIZE);
1170 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
1172 hammer_modify_buffer_done(buffer2);
1173 hammer_unlock(&hmp->blkmap_lock);
1177 hammer_rel_buffer(buffer1, 0);
1179 hammer_rel_buffer(buffer2, 0);
1184 * Backend function - finalize (offset, bytes) in a zone.
1186 * Allocate space that was previously reserved by the frontend.
1189 hammer_blockmap_finalize(hammer_transaction_t trans,
1190 hammer_reserve_t resv,
1191 hammer_off_t zone_offset, int bytes)
1194 hammer_volume_t root_volume;
1195 hammer_blockmap_t freemap;
1196 struct hammer_blockmap_layer1 *layer1;
1197 struct hammer_blockmap_layer2 *layer2;
1198 hammer_buffer_t buffer1 = NULL;
1199 hammer_buffer_t buffer2 = NULL;
1200 hammer_off_t layer1_offset;
1201 hammer_off_t layer2_offset;
1213 bytes = (bytes + 15) & ~15;
1214 KKASSERT(bytes <= HAMMER_XBUFSIZE);
1217 * Basic zone validation & locking
1219 zone = HAMMER_ZONE_DECODE(zone_offset);
1220 KKASSERT(hammer_is_zone2_mapped_index(zone));
1221 root_volume = trans->rootvol;
1224 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
1229 layer1_offset = freemap->phys_offset +
1230 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
1231 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
1234 KKASSERT(layer1->phys_offset &&
1235 layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
1236 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
1237 hammer_lock_ex(&hmp->blkmap_lock);
1238 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
1239 hpanic("CRC FAILED: LAYER1");
1240 hammer_unlock(&hmp->blkmap_lock);
1244 * Dive layer 2, each entry represents a big-block.
1246 layer2_offset = layer1->phys_offset +
1247 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
1248 layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
1251 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
1252 hammer_lock_ex(&hmp->blkmap_lock);
1253 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
1254 hpanic("CRC FAILED: LAYER2");
1255 hammer_unlock(&hmp->blkmap_lock);
1258 hammer_lock_ex(&hmp->blkmap_lock);
1260 hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
1263 * Finalize some or all of the space covered by a current
1264 * reservation. An allocation in the same layer may have
1265 * already assigned ownership.
1267 if (layer2->zone == 0) {
1268 hammer_modify_buffer(trans, buffer1, layer1, sizeof(*layer1));
1269 --layer1->blocks_free;
1270 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
1271 hammer_modify_buffer_done(buffer1);
1272 layer2->zone = zone;
1273 KKASSERT(layer2->bytes_free == HAMMER_BIGBLOCK_SIZE);
1274 KKASSERT(layer2->append_off == 0);
1275 hammer_modify_volume_field(trans,
1277 vol0_stat_freebigblocks);
1278 --root_volume->ondisk->vol0_stat_freebigblocks;
1279 hmp->copy_stat_freebigblocks =
1280 root_volume->ondisk->vol0_stat_freebigblocks;
1281 hammer_modify_volume_done(trans->rootvol);
1283 if (layer2->zone != zone)
1284 hdkprintf("layer2 zone mismatch %d %d\n", layer2->zone, zone);
1285 KKASSERT(layer2->zone == zone);
1286 KKASSERT(bytes != 0);
1287 layer2->bytes_free -= bytes;
1290 resv->flags &= ~HAMMER_RESF_LAYER2FREE;
1294 * Finalizations can occur out of order, or combined with allocations.
1295 * append_off must be set to the highest allocated offset.
1297 offset = ((int)zone_offset & HAMMER_BIGBLOCK_MASK) + bytes;
1298 if (layer2->append_off < offset)
1299 layer2->append_off = offset;
1301 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
1302 hammer_modify_buffer_done(buffer2);
1303 hammer_unlock(&hmp->blkmap_lock);
1307 hammer_rel_buffer(buffer1, 0);
1309 hammer_rel_buffer(buffer2, 0);
1314 * Return the approximate number of free bytes in the big-block
1315 * containing the specified blockmap offset.
1317 * WARNING: A negative number can be returned if data de-dup exists,
1318 * and the result will also not represent he actual number
1319 * of free bytes in this case.
1321 * This code is used only by the reblocker.
1324 hammer_blockmap_getfree(hammer_mount_t hmp, hammer_off_t zone_offset,
1325 int *curp, int *errorp)
1327 hammer_volume_t root_volume;
1328 hammer_blockmap_t blockmap;
1329 hammer_blockmap_t freemap;
1330 struct hammer_blockmap_layer1 *layer1;
1331 struct hammer_blockmap_layer2 *layer2;
1332 hammer_buffer_t buffer = NULL;
1333 hammer_off_t layer1_offset;
1334 hammer_off_t layer2_offset;
1338 zone = HAMMER_ZONE_DECODE(zone_offset);
1339 KKASSERT(hammer_is_zone2_mapped_index(zone));
1340 root_volume = hammer_get_root_volume(hmp, errorp);
1345 blockmap = &hmp->blockmap[zone];
1346 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
1351 layer1_offset = freemap->phys_offset +
1352 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
1353 layer1 = hammer_bread(hmp, layer1_offset, errorp, &buffer);
1359 KKASSERT(layer1->phys_offset);
1360 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
1361 hammer_lock_ex(&hmp->blkmap_lock);
1362 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
1363 hpanic("CRC FAILED: LAYER1");
1364 hammer_unlock(&hmp->blkmap_lock);
1368 * Dive layer 2, each entry represents a big-block.
1370 * (reuse buffer, layer1 pointer becomes invalid)
1372 layer2_offset = layer1->phys_offset +
1373 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
1374 layer2 = hammer_bread(hmp, layer2_offset, errorp, &buffer);
1380 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
1381 hammer_lock_ex(&hmp->blkmap_lock);
1382 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
1383 hpanic("CRC FAILED: LAYER2");
1384 hammer_unlock(&hmp->blkmap_lock);
1386 KKASSERT(layer2->zone == zone);
1388 bytes = layer2->bytes_free;
1391 * *curp becomes 1 only when no error and,
1392 * next_offset and zone_offset are in the same big-block.
1394 if ((blockmap->next_offset ^ zone_offset) & ~HAMMER_BIGBLOCK_MASK64)
1395 *curp = 0; /* not same */
1400 hammer_rel_buffer(buffer, 0);
1401 hammer_rel_volume(root_volume, 0);
1402 if (hammer_debug_general & 0x4000) {
1403 hdkprintf("%016jx -> %d\n", (intmax_t)zone_offset, bytes);
1410 * Lookup a blockmap offset and verify blockmap layers.
1413 hammer_blockmap_lookup_verify(hammer_mount_t hmp, hammer_off_t zone_offset,
1416 hammer_volume_t root_volume;
1417 hammer_blockmap_t freemap;
1418 struct hammer_blockmap_layer1 *layer1;
1419 struct hammer_blockmap_layer2 *layer2;
1420 hammer_buffer_t buffer = NULL;
1421 hammer_off_t layer1_offset;
1422 hammer_off_t layer2_offset;
1423 hammer_off_t result_offset;
1424 hammer_off_t base_off;
1425 hammer_reserve_t resv __debugvar;
1429 * Calculate the zone-2 offset.
1431 zone = HAMMER_ZONE_DECODE(zone_offset);
1432 result_offset = hammer_xlate_to_zone2(zone_offset);
1435 * Validate the allocation zone
1437 root_volume = hammer_get_root_volume(hmp, errorp);
1440 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
1441 KKASSERT(freemap->phys_offset != 0);
1446 layer1_offset = freemap->phys_offset +
1447 HAMMER_BLOCKMAP_LAYER1_OFFSET(zone_offset);
1448 layer1 = hammer_bread(hmp, layer1_offset, errorp, &buffer);
1451 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
1452 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE)) {
1453 hammer_lock_ex(&hmp->blkmap_lock);
1454 if (layer1->layer1_crc != crc32(layer1, HAMMER_LAYER1_CRCSIZE))
1455 hpanic("CRC FAILED: LAYER1");
1456 hammer_unlock(&hmp->blkmap_lock);
1460 * Dive layer 2, each entry represents a big-block.
1462 layer2_offset = layer1->phys_offset +
1463 HAMMER_BLOCKMAP_LAYER2_OFFSET(zone_offset);
1464 layer2 = hammer_bread(hmp, layer2_offset, errorp, &buffer);
1468 if (layer2->zone == 0) {
1469 base_off = hammer_xlate_to_zone2(zone_offset &
1470 ~HAMMER_BIGBLOCK_MASK64);
1471 resv = RB_LOOKUP(hammer_res_rb_tree, &hmp->rb_resv_root,
1473 KKASSERT(resv && resv->zone == zone);
1475 } else if (layer2->zone != zone) {
1476 hpanic("bad zone %d/%d", layer2->zone, zone);
1478 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE)) {
1479 hammer_lock_ex(&hmp->blkmap_lock);
1480 if (layer2->entry_crc != crc32(layer2, HAMMER_LAYER2_CRCSIZE))
1481 hpanic("CRC FAILED: LAYER2");
1482 hammer_unlock(&hmp->blkmap_lock);
1487 hammer_rel_buffer(buffer, 0);
1488 hammer_rel_volume(root_volume, 0);
1489 if (hammer_debug_general & 0x0800) {
1490 hdkprintf("%016jx -> %016jx\n",
1491 (intmax_t)zone_offset, (intmax_t)result_offset);
1493 return(result_offset);
1498 * Check space availability
1500 * MPSAFE - does not require fs_token
1503 _hammer_checkspace(hammer_mount_t hmp, int slop, int64_t *resp)
1505 const int in_size = sizeof(struct hammer_inode_data) +
1506 sizeof(union hammer_btree_elm);
1507 const int rec_size = (sizeof(union hammer_btree_elm) * 2);
1510 usedbytes = hmp->rsv_inodes * in_size +
1511 hmp->rsv_recs * rec_size +
1512 hmp->rsv_databytes +
1513 ((int64_t)hmp->rsv_fromdelay << HAMMER_BIGBLOCK_BITS) +
1514 ((int64_t)hammer_limit_dirtybufspace) +
1515 (slop << HAMMER_BIGBLOCK_BITS);
1517 hammer_count_extra_space_used = usedbytes; /* debugging */
1521 if (hmp->copy_stat_freebigblocks >=
1522 (usedbytes >> HAMMER_BIGBLOCK_BITS)) {
1529 hammer_check_volume(hammer_mount_t hmp, hammer_off_t *offsetp)
1531 hammer_blockmap_t freemap;
1532 struct hammer_blockmap_layer1 *layer1;
1533 hammer_buffer_t buffer1 = NULL;
1534 hammer_off_t layer1_offset;
1537 freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
1539 layer1_offset = freemap->phys_offset +
1540 HAMMER_BLOCKMAP_LAYER1_OFFSET(*offsetp);
1541 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
1546 * No more physically available space in layer1s
1547 * of the current volume, go to the next volume.
1549 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL)
1550 hammer_skip_volume(offsetp);
1553 hammer_rel_buffer(buffer1, 0);
1558 hammer_skip_volume(hammer_off_t *offsetp)
1560 hammer_off_t offset;
1564 zone = HAMMER_ZONE_DECODE(offset);
1565 vol_no = HAMMER_VOL_DECODE(offset) + 1;
1566 KKASSERT(vol_no <= HAMMER_MAX_VOLUMES);
1568 if (vol_no == HAMMER_MAX_VOLUMES) { /* wrap */
1573 *offsetp = HAMMER_ENCODE(zone, vol_no, 0);