Lines Matching full:wc
104 #define WC_MODE_PMEM(wc) ((wc)->pmem_mode) argument
105 #define WC_MODE_FUA(wc) ((wc)->writeback_fua) argument
107 #define WC_MODE_PMEM(wc) false argument
108 #define WC_MODE_FUA(wc) false argument
110 #define WC_MODE_SORT_FREELIST(wc) (!WC_MODE_PMEM(wc)) argument
228 struct dm_writecache *wc; member
237 struct dm_writecache *wc; member
246 static void wc_lock(struct dm_writecache *wc) in wc_lock() argument
248 mutex_lock(&wc->lock); in wc_lock()
251 static void wc_unlock(struct dm_writecache *wc) in wc_unlock() argument
253 mutex_unlock(&wc->lock); in wc_unlock()
257 static int persistent_memory_claim(struct dm_writecache *wc) in persistent_memory_claim() argument
267 wc->memory_vmapped = false; in persistent_memory_claim()
269 s = wc->memory_map_size; in persistent_memory_claim()
280 offset = get_start_sect(wc->ssd_dev->bdev); in persistent_memory_claim()
289 da = dax_direct_access(wc->ssd_dev->dax_dev, offset, p, DAX_ACCESS, in persistent_memory_claim()
290 &wc->memory_map, &pfn); in persistent_memory_claim()
292 wc->memory_map = NULL; in persistent_memory_claim()
297 wc->memory_map = NULL; in persistent_memory_claim()
303 wc->memory_map = NULL; in persistent_memory_claim()
312 daa = dax_direct_access(wc->ssd_dev->dax_dev, offset + i, in persistent_memory_claim()
329 wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL); in persistent_memory_claim()
330 if (!wc->memory_map) { in persistent_memory_claim()
335 wc->memory_vmapped = true; in persistent_memory_claim()
340 wc->memory_map += (size_t)wc->start_sector << SECTOR_SHIFT; in persistent_memory_claim()
341 wc->memory_map_size -= (size_t)wc->start_sector << SECTOR_SHIFT; in persistent_memory_claim()
352 static int persistent_memory_claim(struct dm_writecache *wc) in persistent_memory_claim() argument
358 static void persistent_memory_release(struct dm_writecache *wc) in persistent_memory_release() argument
360 if (wc->memory_vmapped) in persistent_memory_release()
361 vunmap(wc->memory_map - ((size_t)wc->start_sector << SECTOR_SHIFT)); in persistent_memory_release()
389 static struct wc_memory_superblock *sb(struct dm_writecache *wc) in sb() argument
391 return wc->memory_map; in sb()
394 static struct wc_memory_entry *memory_entry(struct dm_writecache *wc, struct wc_entry *e) in memory_entry() argument
396 return &sb(wc)->entries[e->index]; in memory_entry()
399 static void *memory_data(struct dm_writecache *wc, struct wc_entry *e) in memory_data() argument
401 return (char *)wc->block_start + (e->index << wc->block_size_bits); in memory_data()
404 static sector_t cache_sector(struct dm_writecache *wc, struct wc_entry *e) in cache_sector() argument
406 return wc->start_sector + wc->metadata_sectors + in cache_sector()
407 ((sector_t)e->index << (wc->block_size_bits - SECTOR_SHIFT)); in cache_sector()
410 static uint64_t read_original_sector(struct dm_writecache *wc, struct wc_entry *e) in read_original_sector() argument
415 return le64_to_cpu(memory_entry(wc, e)->original_sector); in read_original_sector()
419 static uint64_t read_seq_count(struct dm_writecache *wc, struct wc_entry *e) in read_seq_count() argument
424 return le64_to_cpu(memory_entry(wc, e)->seq_count); in read_seq_count()
428 static void clear_seq_count(struct dm_writecache *wc, struct wc_entry *e) in clear_seq_count() argument
433 pmem_assign(memory_entry(wc, e)->seq_count, cpu_to_le64(-1)); in clear_seq_count()
436 static void write_original_sector_seq_count(struct dm_writecache *wc, struct wc_entry *e, in write_original_sector_seq_count() argument
446 pmem_assign(*memory_entry(wc, e), me); in write_original_sector_seq_count()
449 #define writecache_error(wc, err, msg, arg...) \ argument
451 if (!cmpxchg(&(wc)->error, 0, err)) \
453 wake_up(&(wc)->freelist_wait); \
456 #define writecache_has_error(wc) (unlikely(READ_ONCE((wc)->error))) argument
458 static void writecache_flush_all_metadata(struct dm_writecache *wc) in writecache_flush_all_metadata() argument
460 if (!WC_MODE_PMEM(wc)) in writecache_flush_all_metadata()
461 memset(wc->dirty_bitmap, -1, wc->dirty_bitmap_size); in writecache_flush_all_metadata()
464 static void writecache_flush_region(struct dm_writecache *wc, void *ptr, size_t size) in writecache_flush_region() argument
466 if (!WC_MODE_PMEM(wc)) in writecache_flush_region()
467 __set_bit(((char *)ptr - (char *)wc->memory_map) / BITMAP_GRANULARITY, in writecache_flush_region()
468 wc->dirty_bitmap); in writecache_flush_region()
471 static void writecache_disk_flush(struct dm_writecache *wc, struct dm_dev *dev);
474 struct dm_writecache *wc; member
484 writecache_error(endio->wc, -EIO, "error writing metadata"); in writecache_notify_io()
490 static void writecache_wait_for_ios(struct dm_writecache *wc, int direction) in writecache_wait_for_ios() argument
492 wait_event(wc->bio_in_progress_wait[direction], in writecache_wait_for_ios()
493 !atomic_read(&wc->bio_in_progress[direction])); in writecache_wait_for_ios()
496 static void ssd_commit_flushed(struct dm_writecache *wc, bool wait_for_ios) in ssd_commit_flushed() argument
501 wc, in ssd_commit_flushed()
505 unsigned bitmap_bits = wc->dirty_bitmap_size * 8; in ssd_commit_flushed()
510 i = find_next_bit(wc->dirty_bitmap, bitmap_bits, i); in ssd_commit_flushed()
513 j = find_next_zero_bit(wc->dirty_bitmap, bitmap_bits, i); in ssd_commit_flushed()
515 region.bdev = wc->ssd_dev->bdev; in ssd_commit_flushed()
519 if (unlikely(region.sector >= wc->metadata_sectors)) in ssd_commit_flushed()
521 if (unlikely(region.sector + region.count > wc->metadata_sectors)) in ssd_commit_flushed()
522 region.count = wc->metadata_sectors - region.sector; in ssd_commit_flushed()
524 region.sector += wc->start_sector; in ssd_commit_flushed()
528 req.mem.ptr.vma = (char *)wc->memory_map + (size_t)i * BITMAP_GRANULARITY; in ssd_commit_flushed()
529 req.client = wc->dm_io; in ssd_commit_flushed()
542 writecache_wait_for_ios(wc, WRITE); in ssd_commit_flushed()
544 writecache_disk_flush(wc, wc->ssd_dev); in ssd_commit_flushed()
546 memset(wc->dirty_bitmap, 0, wc->dirty_bitmap_size); in ssd_commit_flushed()
549 static void ssd_commit_superblock(struct dm_writecache *wc) in ssd_commit_superblock() argument
555 region.bdev = wc->ssd_dev->bdev; in ssd_commit_superblock()
557 region.count = max(4096U, wc->block_size) >> SECTOR_SHIFT; in ssd_commit_superblock()
559 if (unlikely(region.sector + region.count > wc->metadata_sectors)) in ssd_commit_superblock()
560 region.count = wc->metadata_sectors - region.sector; in ssd_commit_superblock()
562 region.sector += wc->start_sector; in ssd_commit_superblock()
566 req.mem.ptr.vma = (char *)wc->memory_map; in ssd_commit_superblock()
567 req.client = wc->dm_io; in ssd_commit_superblock()
573 writecache_error(wc, r, "error writing superblock"); in ssd_commit_superblock()
576 static void writecache_commit_flushed(struct dm_writecache *wc, bool wait_for_ios) in writecache_commit_flushed() argument
578 if (WC_MODE_PMEM(wc)) in writecache_commit_flushed()
581 ssd_commit_flushed(wc, wait_for_ios); in writecache_commit_flushed()
584 static void writecache_disk_flush(struct dm_writecache *wc, struct dm_dev *dev) in writecache_disk_flush() argument
596 req.client = wc->dm_io; in writecache_disk_flush()
601 writecache_error(wc, r, "error flushing metadata: %d", r); in writecache_disk_flush()
607 static struct wc_entry *writecache_find_entry(struct dm_writecache *wc, in writecache_find_entry() argument
611 struct rb_node *node = wc->tree.rb_node; in writecache_find_entry()
618 if (read_original_sector(wc, e) == block) in writecache_find_entry()
621 node = (read_original_sector(wc, e) >= block ? in writecache_find_entry()
626 if (read_original_sector(wc, e) >= block) { in writecache_find_entry()
647 if (read_original_sector(wc, e2) != block) in writecache_find_entry()
653 static void writecache_insert_entry(struct dm_writecache *wc, struct wc_entry *ins) in writecache_insert_entry() argument
656 struct rb_node **node = &wc->tree.rb_node, *parent = NULL; in writecache_insert_entry()
661 if (read_original_sector(wc, e) > read_original_sector(wc, ins)) in writecache_insert_entry()
667 rb_insert_color(&ins->rb_node, &wc->tree); in writecache_insert_entry()
668 list_add(&ins->lru, &wc->lru); in writecache_insert_entry()
672 static void writecache_unlink(struct dm_writecache *wc, struct wc_entry *e) in writecache_unlink() argument
675 rb_erase(&e->rb_node, &wc->tree); in writecache_unlink()
678 static void writecache_add_to_freelist(struct dm_writecache *wc, struct wc_entry *e) in writecache_add_to_freelist() argument
680 if (WC_MODE_SORT_FREELIST(wc)) { in writecache_add_to_freelist()
681 struct rb_node **node = &wc->freetree.rb_node, *parent = NULL; in writecache_add_to_freelist()
683 wc->current_free = e; in writecache_add_to_freelist()
692 rb_insert_color(&e->rb_node, &wc->freetree); in writecache_add_to_freelist()
694 list_add_tail(&e->lru, &wc->freelist); in writecache_add_to_freelist()
696 wc->freelist_size++; in writecache_add_to_freelist()
699 static inline void writecache_verify_watermark(struct dm_writecache *wc) in writecache_verify_watermark() argument
701 if (unlikely(wc->freelist_size + wc->writeback_size <= wc->freelist_high_watermark)) in writecache_verify_watermark()
702 queue_work(wc->writeback_wq, &wc->writeback_work); in writecache_verify_watermark()
707 struct dm_writecache *wc = from_timer(wc, t, max_age_timer); in writecache_max_age_timer() local
709 if (!dm_suspended(wc->ti) && !writecache_has_error(wc)) { in writecache_max_age_timer()
710 queue_work(wc->writeback_wq, &wc->writeback_work); in writecache_max_age_timer()
711 mod_timer(&wc->max_age_timer, jiffies + wc->max_age / MAX_AGE_DIV); in writecache_max_age_timer()
715 static struct wc_entry *writecache_pop_from_freelist(struct dm_writecache *wc, sector_t expected_se… in writecache_pop_from_freelist() argument
719 if (WC_MODE_SORT_FREELIST(wc)) { in writecache_pop_from_freelist()
721 if (unlikely(!wc->current_free)) in writecache_pop_from_freelist()
723 e = wc->current_free; in writecache_pop_from_freelist()
724 if (expected_sector != (sector_t)-1 && unlikely(cache_sector(wc, e) != expected_sector)) in writecache_pop_from_freelist()
727 rb_erase(&e->rb_node, &wc->freetree); in writecache_pop_from_freelist()
729 next = rb_first(&wc->freetree); in writecache_pop_from_freelist()
730 wc->current_free = next ? container_of(next, struct wc_entry, rb_node) : NULL; in writecache_pop_from_freelist()
732 if (unlikely(list_empty(&wc->freelist))) in writecache_pop_from_freelist()
734 e = container_of(wc->freelist.next, struct wc_entry, lru); in writecache_pop_from_freelist()
735 if (expected_sector != (sector_t)-1 && unlikely(cache_sector(wc, e) != expected_sector)) in writecache_pop_from_freelist()
739 wc->freelist_size--; in writecache_pop_from_freelist()
741 writecache_verify_watermark(wc); in writecache_pop_from_freelist()
746 static void writecache_free_entry(struct dm_writecache *wc, struct wc_entry *e) in writecache_free_entry() argument
748 writecache_unlink(wc, e); in writecache_free_entry()
749 writecache_add_to_freelist(wc, e); in writecache_free_entry()
750 clear_seq_count(wc, e); in writecache_free_entry()
751 writecache_flush_region(wc, memory_entry(wc, e), sizeof(struct wc_memory_entry)); in writecache_free_entry()
752 if (unlikely(waitqueue_active(&wc->freelist_wait))) in writecache_free_entry()
753 wake_up(&wc->freelist_wait); in writecache_free_entry()
756 static void writecache_wait_on_freelist(struct dm_writecache *wc) in writecache_wait_on_freelist() argument
760 prepare_to_wait(&wc->freelist_wait, &wait, TASK_UNINTERRUPTIBLE); in writecache_wait_on_freelist()
761 wc_unlock(wc); in writecache_wait_on_freelist()
763 finish_wait(&wc->freelist_wait, &wait); in writecache_wait_on_freelist()
764 wc_lock(wc); in writecache_wait_on_freelist()
767 static void writecache_poison_lists(struct dm_writecache *wc) in writecache_poison_lists() argument
772 memset(&wc->tree, -1, sizeof wc->tree); in writecache_poison_lists()
773 wc->lru.next = LIST_POISON1; in writecache_poison_lists()
774 wc->lru.prev = LIST_POISON2; in writecache_poison_lists()
775 wc->freelist.next = LIST_POISON1; in writecache_poison_lists()
776 wc->freelist.prev = LIST_POISON2; in writecache_poison_lists()
779 static void writecache_flush_entry(struct dm_writecache *wc, struct wc_entry *e) in writecache_flush_entry() argument
781 writecache_flush_region(wc, memory_entry(wc, e), sizeof(struct wc_memory_entry)); in writecache_flush_entry()
782 if (WC_MODE_PMEM(wc)) in writecache_flush_entry()
783 writecache_flush_region(wc, memory_data(wc, e), wc->block_size); in writecache_flush_entry()
786 static bool writecache_entry_is_committed(struct dm_writecache *wc, struct wc_entry *e) in writecache_entry_is_committed() argument
788 return read_seq_count(wc, e) < wc->seq_count; in writecache_entry_is_committed()
791 static void writecache_flush(struct dm_writecache *wc) in writecache_flush() argument
796 wc->uncommitted_blocks = 0; in writecache_flush()
797 del_timer(&wc->autocommit_timer); in writecache_flush()
799 if (list_empty(&wc->lru)) in writecache_flush()
802 e = container_of(wc->lru.next, struct wc_entry, lru); in writecache_flush()
803 if (writecache_entry_is_committed(wc, e)) { in writecache_flush()
804 if (wc->overwrote_committed) { in writecache_flush()
805 writecache_wait_for_ios(wc, WRITE); in writecache_flush()
806 writecache_disk_flush(wc, wc->ssd_dev); in writecache_flush()
807 wc->overwrote_committed = false; in writecache_flush()
812 writecache_flush_entry(wc, e); in writecache_flush()
813 if (unlikely(e->lru.next == &wc->lru)) in writecache_flush()
816 if (writecache_entry_is_committed(wc, e2)) in writecache_flush()
821 writecache_commit_flushed(wc, true); in writecache_flush()
823 wc->seq_count++; in writecache_flush()
824 pmem_assign(sb(wc)->seq_count, cpu_to_le64(wc->seq_count)); in writecache_flush()
825 if (WC_MODE_PMEM(wc)) in writecache_flush()
826 writecache_commit_flushed(wc, false); in writecache_flush()
828 ssd_commit_superblock(wc); in writecache_flush()
830 wc->overwrote_committed = false; in writecache_flush()
839 if (read_original_sector(wc, e2) == read_original_sector(wc, e) && in writecache_flush()
841 writecache_free_entry(wc, e2); in writecache_flush()
845 if (unlikely(e->lru.prev == &wc->lru)) in writecache_flush()
852 writecache_commit_flushed(wc, false); in writecache_flush()
857 struct dm_writecache *wc = container_of(work, struct dm_writecache, flush_work); in writecache_flush_work() local
859 wc_lock(wc); in writecache_flush_work()
860 writecache_flush(wc); in writecache_flush_work()
861 wc_unlock(wc); in writecache_flush_work()
866 struct dm_writecache *wc = from_timer(wc, t, autocommit_timer); in writecache_autocommit_timer() local
867 if (!writecache_has_error(wc)) in writecache_autocommit_timer()
868 queue_work(wc->writeback_wq, &wc->flush_work); in writecache_autocommit_timer()
871 static void writecache_schedule_autocommit(struct dm_writecache *wc) in writecache_schedule_autocommit() argument
873 if (!timer_pending(&wc->autocommit_timer)) in writecache_schedule_autocommit()
874 mod_timer(&wc->autocommit_timer, jiffies + wc->autocommit_jiffies); in writecache_schedule_autocommit()
877 static void writecache_discard(struct dm_writecache *wc, sector_t start, sector_t end) in writecache_discard() argument
882 e = writecache_find_entry(wc, start, WFE_RETURN_FOLLOWING | WFE_LOWEST_SEQ); in writecache_discard()
886 while (read_original_sector(wc, e) < end) { in writecache_discard()
891 if (!WC_MODE_PMEM(wc)) { in writecache_discard()
892 writecache_wait_for_ios(wc, READ); in writecache_discard()
893 writecache_wait_for_ios(wc, WRITE); in writecache_discard()
897 if (!writecache_entry_is_committed(wc, e)) in writecache_discard()
898 wc->uncommitted_blocks--; in writecache_discard()
899 writecache_free_entry(wc, e); in writecache_discard()
909 writecache_commit_flushed(wc, false); in writecache_discard()
912 static bool writecache_wait_for_writeback(struct dm_writecache *wc) in writecache_wait_for_writeback() argument
914 if (wc->writeback_size) { in writecache_wait_for_writeback()
915 writecache_wait_on_freelist(wc); in writecache_wait_for_writeback()
923 struct dm_writecache *wc = ti->private; in writecache_suspend() local
926 del_timer_sync(&wc->autocommit_timer); in writecache_suspend()
927 del_timer_sync(&wc->max_age_timer); in writecache_suspend()
929 wc_lock(wc); in writecache_suspend()
930 writecache_flush(wc); in writecache_suspend()
931 flush_on_suspend = wc->flush_on_suspend; in writecache_suspend()
933 wc->flush_on_suspend = false; in writecache_suspend()
934 wc->writeback_all++; in writecache_suspend()
935 queue_work(wc->writeback_wq, &wc->writeback_work); in writecache_suspend()
937 wc_unlock(wc); in writecache_suspend()
939 drain_workqueue(wc->writeback_wq); in writecache_suspend()
941 wc_lock(wc); in writecache_suspend()
943 wc->writeback_all--; in writecache_suspend()
944 while (writecache_wait_for_writeback(wc)); in writecache_suspend()
946 if (WC_MODE_PMEM(wc)) in writecache_suspend()
947 persistent_memory_flush_cache(wc->memory_map, wc->memory_map_size); in writecache_suspend()
949 writecache_poison_lists(wc); in writecache_suspend()
951 wc_unlock(wc); in writecache_suspend()
954 static int writecache_alloc_entries(struct dm_writecache *wc) in writecache_alloc_entries() argument
958 if (wc->entries) in writecache_alloc_entries()
960 wc->entries = vmalloc(array_size(sizeof(struct wc_entry), wc->n_blocks)); in writecache_alloc_entries()
961 if (!wc->entries) in writecache_alloc_entries()
963 for (b = 0; b < wc->n_blocks; b++) { in writecache_alloc_entries()
964 struct wc_entry *e = &wc->entries[b]; in writecache_alloc_entries()
973 static int writecache_read_metadata(struct dm_writecache *wc, sector_t n_sectors) in writecache_read_metadata() argument
978 region.bdev = wc->ssd_dev->bdev; in writecache_read_metadata()
979 region.sector = wc->start_sector; in writecache_read_metadata()
983 req.mem.ptr.vma = (char *)wc->memory_map; in writecache_read_metadata()
984 req.client = wc->dm_io; in writecache_read_metadata()
992 struct dm_writecache *wc = ti->private; in writecache_resume() local
998 wc_lock(wc); in writecache_resume()
1000 wc->data_device_sectors = bdev_nr_sectors(wc->dev->bdev); in writecache_resume()
1002 if (WC_MODE_PMEM(wc)) { in writecache_resume()
1003 persistent_memory_invalidate_cache(wc->memory_map, wc->memory_map_size); in writecache_resume()
1005 r = writecache_read_metadata(wc, wc->metadata_sectors); in writecache_resume()
1008 writecache_error(wc, r, "unable to read metadata: %d", r); in writecache_resume()
1010 memset((char *)wc->memory_map + sb_entries_offset, -1, in writecache_resume()
1011 (wc->metadata_sectors << SECTOR_SHIFT) - sb_entries_offset); in writecache_resume()
1015 wc->tree = RB_ROOT; in writecache_resume()
1016 INIT_LIST_HEAD(&wc->lru); in writecache_resume()
1017 if (WC_MODE_SORT_FREELIST(wc)) { in writecache_resume()
1018 wc->freetree = RB_ROOT; in writecache_resume()
1019 wc->current_free = NULL; in writecache_resume()
1021 INIT_LIST_HEAD(&wc->freelist); in writecache_resume()
1023 wc->freelist_size = 0; in writecache_resume()
1025 r = copy_mc_to_kernel(&sb_seq_count, &sb(wc)->seq_count, in writecache_resume()
1028 writecache_error(wc, r, "hardware memory error when reading superblock: %d", r); in writecache_resume()
1031 wc->seq_count = le64_to_cpu(sb_seq_count); in writecache_resume()
1034 for (b = 0; b < wc->n_blocks; b++) { in writecache_resume()
1035 struct wc_entry *e = &wc->entries[b]; in writecache_resume()
1037 if (writecache_has_error(wc)) { in writecache_resume()
1042 r = copy_mc_to_kernel(&wme, memory_entry(wc, e), in writecache_resume()
1045 writecache_error(wc, r, "hardware memory error when reading metadata entry %lu: %d", in writecache_resume()
1056 for (b = 0; b < wc->n_blocks; b++) { in writecache_resume()
1057 struct wc_entry *e = &wc->entries[b]; in writecache_resume()
1058 if (!writecache_entry_is_committed(wc, e)) { in writecache_resume()
1059 if (read_seq_count(wc, e) != -1) { in writecache_resume()
1061 clear_seq_count(wc, e); in writecache_resume()
1064 writecache_add_to_freelist(wc, e); in writecache_resume()
1068 old = writecache_find_entry(wc, read_original_sector(wc, e), 0); in writecache_resume()
1070 writecache_insert_entry(wc, e); in writecache_resume()
1072 if (read_seq_count(wc, old) == read_seq_count(wc, e)) { in writecache_resume()
1073 writecache_error(wc, -EINVAL, in writecache_resume()
1075 (unsigned long long)b, (unsigned long long)read_original_sector(wc, e), in writecache_resume()
1076 (unsigned long long)read_seq_count(wc, e)); in writecache_resume()
1078 if (read_seq_count(wc, old) > read_seq_count(wc, e)) { in writecache_resume()
1081 writecache_free_entry(wc, old); in writecache_resume()
1082 writecache_insert_entry(wc, e); in writecache_resume()
1091 writecache_flush_all_metadata(wc); in writecache_resume()
1092 writecache_commit_flushed(wc, false); in writecache_resume()
1095 writecache_verify_watermark(wc); in writecache_resume()
1097 if (wc->max_age != MAX_AGE_UNSPECIFIED) in writecache_resume()
1098 mod_timer(&wc->max_age_timer, jiffies + wc->max_age / MAX_AGE_DIV); in writecache_resume()
1100 wc_unlock(wc); in writecache_resume()
1103 static int process_flush_mesg(unsigned argc, char **argv, struct dm_writecache *wc) in process_flush_mesg() argument
1108 wc_lock(wc); in process_flush_mesg()
1109 if (dm_suspended(wc->ti)) { in process_flush_mesg()
1110 wc_unlock(wc); in process_flush_mesg()
1113 if (writecache_has_error(wc)) { in process_flush_mesg()
1114 wc_unlock(wc); in process_flush_mesg()
1118 writecache_flush(wc); in process_flush_mesg()
1119 wc->writeback_all++; in process_flush_mesg()
1120 queue_work(wc->writeback_wq, &wc->writeback_work); in process_flush_mesg()
1121 wc_unlock(wc); in process_flush_mesg()
1123 flush_workqueue(wc->writeback_wq); in process_flush_mesg()
1125 wc_lock(wc); in process_flush_mesg()
1126 wc->writeback_all--; in process_flush_mesg()
1127 if (writecache_has_error(wc)) { in process_flush_mesg()
1128 wc_unlock(wc); in process_flush_mesg()
1131 wc_unlock(wc); in process_flush_mesg()
1136 static int process_flush_on_suspend_mesg(unsigned argc, char **argv, struct dm_writecache *wc) in process_flush_on_suspend_mesg() argument
1141 wc_lock(wc); in process_flush_on_suspend_mesg()
1142 wc->flush_on_suspend = true; in process_flush_on_suspend_mesg()
1143 wc_unlock(wc); in process_flush_on_suspend_mesg()
1148 static void activate_cleaner(struct dm_writecache *wc) in activate_cleaner() argument
1150 wc->flush_on_suspend = true; in activate_cleaner()
1151 wc->cleaner = true; in activate_cleaner()
1152 wc->freelist_high_watermark = wc->n_blocks; in activate_cleaner()
1153 wc->freelist_low_watermark = wc->n_blocks; in activate_cleaner()
1156 static int process_cleaner_mesg(unsigned argc, char **argv, struct dm_writecache *wc) in process_cleaner_mesg() argument
1161 wc_lock(wc); in process_cleaner_mesg()
1162 activate_cleaner(wc); in process_cleaner_mesg()
1163 if (!dm_suspended(wc->ti)) in process_cleaner_mesg()
1164 writecache_verify_watermark(wc); in process_cleaner_mesg()
1165 wc_unlock(wc); in process_cleaner_mesg()
1170 static int process_clear_stats_mesg(unsigned argc, char **argv, struct dm_writecache *wc) in process_clear_stats_mesg() argument
1175 wc_lock(wc); in process_clear_stats_mesg()
1176 memset(&wc->stats, 0, sizeof wc->stats); in process_clear_stats_mesg()
1177 wc_unlock(wc); in process_clear_stats_mesg()
1186 struct dm_writecache *wc = ti->private; in writecache_message() local
1189 r = process_flush_mesg(argc, argv, wc); in writecache_message()
1191 r = process_flush_on_suspend_mesg(argc, argv, wc); in writecache_message()
1193 r = process_cleaner_mesg(argc, argv, wc); in writecache_message()
1195 r = process_clear_stats_mesg(argc, argv, wc); in writecache_message()
1238 static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data) in bio_copy_block() argument
1243 unsigned remaining_size = wc->block_size; in bio_copy_block()
1257 writecache_error(wc, r, "hardware memory error when reading data: %d", r); in bio_copy_block()
1275 struct dm_writecache *wc = data; in writecache_flush_thread() local
1280 wc_lock(wc); in writecache_flush_thread()
1281 bio = bio_list_pop(&wc->flush_list); in writecache_flush_thread()
1284 wc_unlock(wc); in writecache_flush_thread()
1296 writecache_discard(wc, bio->bi_iter.bi_sector, in writecache_flush_thread()
1298 wc_unlock(wc); in writecache_flush_thread()
1299 bio_set_dev(bio, wc->dev->bdev); in writecache_flush_thread()
1302 writecache_flush(wc); in writecache_flush_thread()
1303 wc_unlock(wc); in writecache_flush_thread()
1304 if (writecache_has_error(wc)) in writecache_flush_thread()
1313 static void writecache_offload_bio(struct dm_writecache *wc, struct bio *bio) in writecache_offload_bio() argument
1315 if (bio_list_empty(&wc->flush_list)) in writecache_offload_bio()
1316 wake_up_process(wc->flush_thread); in writecache_offload_bio()
1317 bio_list_add(&wc->flush_list, bio); in writecache_offload_bio()
1328 static void writecache_map_remap_origin(struct dm_writecache *wc, struct bio *bio, in writecache_map_remap_origin() argument
1333 read_original_sector(wc, e) - bio->bi_iter.bi_sector; in writecache_map_remap_origin()
1339 static enum wc_map_op writecache_map_read(struct dm_writecache *wc, struct bio *bio) in writecache_map_read() argument
1345 wc->stats.reads++; in writecache_map_read()
1346 e = writecache_find_entry(wc, bio->bi_iter.bi_sector, WFE_RETURN_FOLLOWING); in writecache_map_read()
1347 if (e && read_original_sector(wc, e) == bio->bi_iter.bi_sector) { in writecache_map_read()
1348 wc->stats.read_hits++; in writecache_map_read()
1349 if (WC_MODE_PMEM(wc)) { in writecache_map_read()
1350 bio_copy_block(wc, bio, memory_data(wc, e)); in writecache_map_read()
1355 dm_accept_partial_bio(bio, wc->block_size >> SECTOR_SHIFT); in writecache_map_read()
1356 bio_set_dev(bio, wc->ssd_dev->bdev); in writecache_map_read()
1357 bio->bi_iter.bi_sector = cache_sector(wc, e); in writecache_map_read()
1358 if (!writecache_entry_is_committed(wc, e)) in writecache_map_read()
1359 writecache_wait_for_ios(wc, WRITE); in writecache_map_read()
1363 writecache_map_remap_origin(wc, bio, e); in writecache_map_read()
1364 wc->stats.reads += (bio->bi_iter.bi_size - wc->block_size) >> wc->block_size_bits; in writecache_map_read()
1371 static void writecache_bio_copy_ssd(struct dm_writecache *wc, struct bio *bio, in writecache_bio_copy_ssd() argument
1374 unsigned bio_size = wc->block_size; in writecache_bio_copy_ssd()
1375 sector_t start_cache_sec = cache_sector(wc, e); in writecache_bio_copy_ssd()
1380 struct wc_entry *f = writecache_pop_from_freelist(wc, current_cache_sec); in writecache_bio_copy_ssd()
1383 write_original_sector_seq_count(wc, f, bio->bi_iter.bi_sector + in writecache_bio_copy_ssd()
1384 (bio_size >> SECTOR_SHIFT), wc->seq_count); in writecache_bio_copy_ssd()
1385 writecache_insert_entry(wc, f); in writecache_bio_copy_ssd()
1386 wc->uncommitted_blocks++; in writecache_bio_copy_ssd()
1395 if (read_original_sector(wc, f) != in writecache_bio_copy_ssd()
1396 read_original_sector(wc, e) + (wc->block_size >> SECTOR_SHIFT)) in writecache_bio_copy_ssd()
1400 if (writecache_entry_is_committed(wc, f)) in writecache_bio_copy_ssd()
1401 wc->overwrote_committed = true; in writecache_bio_copy_ssd()
1404 bio_size += wc->block_size; in writecache_bio_copy_ssd()
1405 current_cache_sec += wc->block_size >> SECTOR_SHIFT; in writecache_bio_copy_ssd()
1408 bio_set_dev(bio, wc->ssd_dev->bdev); in writecache_bio_copy_ssd()
1412 wc->stats.writes += bio->bi_iter.bi_size >> wc->block_size_bits; in writecache_bio_copy_ssd()
1413 wc->stats.writes_allocate += (bio->bi_iter.bi_size - wc->block_size) >> wc->block_size_bits; in writecache_bio_copy_ssd()
1415 if (unlikely(wc->uncommitted_blocks >= wc->autocommit_blocks)) { in writecache_bio_copy_ssd()
1416 wc->uncommitted_blocks = 0; in writecache_bio_copy_ssd()
1417 queue_work(wc->writeback_wq, &wc->flush_work); in writecache_bio_copy_ssd()
1419 writecache_schedule_autocommit(wc); in writecache_bio_copy_ssd()
1423 static enum wc_map_op writecache_map_write(struct dm_writecache *wc, struct bio *bio) in writecache_map_write() argument
1430 if (writecache_has_error(wc)) { in writecache_map_write()
1431 wc->stats.writes += bio->bi_iter.bi_size >> wc->block_size_bits; in writecache_map_write()
1434 e = writecache_find_entry(wc, bio->bi_iter.bi_sector, 0); in writecache_map_write()
1436 if (!writecache_entry_is_committed(wc, e)) { in writecache_map_write()
1437 wc->stats.write_hits_uncommitted++; in writecache_map_write()
1441 wc->stats.write_hits_committed++; in writecache_map_write()
1442 if (!WC_MODE_PMEM(wc) && !e->write_in_progress) { in writecache_map_write()
1443 wc->overwrote_committed = true; in writecache_map_write()
1449 if (unlikely(wc->cleaner) || in writecache_map_write()
1450 (wc->metadata_only && !(bio->bi_opf & REQ_META))) in writecache_map_write()
1453 e = writecache_pop_from_freelist(wc, (sector_t)-1); in writecache_map_write()
1455 if (!WC_MODE_PMEM(wc) && !found_entry) { in writecache_map_write()
1457 e = writecache_find_entry(wc, bio->bi_iter.bi_sector, WFE_RETURN_FOLLOWING); in writecache_map_write()
1458 writecache_map_remap_origin(wc, bio, e); in writecache_map_write()
1459 wc->stats.writes_around += bio->bi_iter.bi_size >> wc->block_size_bits; in writecache_map_write()
1460 wc->stats.writes += bio->bi_iter.bi_size >> wc->block_size_bits; in writecache_map_write()
1463 wc->stats.writes_blocked_on_freelist++; in writecache_map_write()
1464 writecache_wait_on_freelist(wc); in writecache_map_write()
1467 write_original_sector_seq_count(wc, e, bio->bi_iter.bi_sector, wc->seq_count); in writecache_map_write()
1468 writecache_insert_entry(wc, e); in writecache_map_write()
1469 wc->uncommitted_blocks++; in writecache_map_write()
1470 wc->stats.writes_allocate++; in writecache_map_write()
1472 if (WC_MODE_PMEM(wc)) { in writecache_map_write()
1473 bio_copy_block(wc, bio, memory_data(wc, e)); in writecache_map_write()
1474 wc->stats.writes++; in writecache_map_write()
1476 writecache_bio_copy_ssd(wc, bio, e, search_used); in writecache_map_write()
1481 if (unlikely(bio->bi_opf & REQ_FUA || wc->uncommitted_blocks >= wc->autocommit_blocks)) in writecache_map_write()
1482 writecache_flush(wc); in writecache_map_write()
1484 writecache_schedule_autocommit(wc); in writecache_map_write()
1489 static enum wc_map_op writecache_map_flush(struct dm_writecache *wc, struct bio *bio) in writecache_map_flush() argument
1491 if (writecache_has_error(wc)) in writecache_map_flush()
1494 if (WC_MODE_PMEM(wc)) { in writecache_map_flush()
1495 wc->stats.flushes++; in writecache_map_flush()
1496 writecache_flush(wc); in writecache_map_flush()
1497 if (writecache_has_error(wc)) in writecache_map_flush()
1499 else if (unlikely(wc->cleaner) || unlikely(wc->metadata_only)) in writecache_map_flush()
1506 wc->stats.flushes++; in writecache_map_flush()
1507 writecache_offload_bio(wc, bio); in writecache_map_flush()
1511 static enum wc_map_op writecache_map_discard(struct dm_writecache *wc, struct bio *bio) in writecache_map_discard() argument
1513 wc->stats.discards += bio->bi_iter.bi_size >> wc->block_size_bits; in writecache_map_discard()
1515 if (writecache_has_error(wc)) in writecache_map_discard()
1518 if (WC_MODE_PMEM(wc)) { in writecache_map_discard()
1519 writecache_discard(wc, bio->bi_iter.bi_sector, bio_end_sector(bio)); in writecache_map_discard()
1523 writecache_offload_bio(wc, bio); in writecache_map_discard()
1529 struct dm_writecache *wc = ti->private; in writecache_map() local
1534 wc_lock(wc); in writecache_map()
1537 map_op = writecache_map_flush(wc, bio); in writecache_map()
1544 (wc->block_size / 512 - 1)) != 0)) { in writecache_map()
1547 bio->bi_iter.bi_size, wc->block_size); in writecache_map()
1553 map_op = writecache_map_discard(wc, bio); in writecache_map()
1558 map_op = writecache_map_read(wc, bio); in writecache_map()
1560 map_op = writecache_map_write(wc, bio); in writecache_map()
1564 if (likely(wc->pause != 0)) { in writecache_map()
1566 dm_iot_io_begin(&wc->iot, 1); in writecache_map()
1570 bio_set_dev(bio, wc->dev->bdev); in writecache_map()
1571 wc_unlock(wc); in writecache_map()
1577 atomic_inc(&wc->bio_in_progress[bio_data_dir(bio)]); in writecache_map()
1578 wc_unlock(wc); in writecache_map()
1582 wc_unlock(wc); in writecache_map()
1587 wc_unlock(wc); in writecache_map()
1591 wc_unlock(wc); in writecache_map()
1597 wc_unlock(wc); in writecache_map()
1604 struct dm_writecache *wc = ti->private; in writecache_end_io() local
1608 if (atomic_dec_and_test(&wc->bio_in_progress[dir])) in writecache_end_io()
1609 if (unlikely(waitqueue_active(&wc->bio_in_progress_wait[dir]))) in writecache_end_io()
1610 wake_up(&wc->bio_in_progress_wait[dir]); in writecache_end_io()
1612 dm_iot_io_end(&wc->iot, 1); in writecache_end_io()
1620 struct dm_writecache *wc = ti->private; in writecache_iterate_devices() local
1622 return fn(ti, wc->dev, 0, ti->len, data); in writecache_iterate_devices()
1627 struct dm_writecache *wc = ti->private; in writecache_io_hints() local
1629 if (limits->logical_block_size < wc->block_size) in writecache_io_hints()
1630 limits->logical_block_size = wc->block_size; in writecache_io_hints()
1632 if (limits->physical_block_size < wc->block_size) in writecache_io_hints()
1633 limits->physical_block_size = wc->block_size; in writecache_io_hints()
1635 if (limits->io_min < wc->block_size) in writecache_io_hints()
1636 limits->io_min = wc->block_size; in writecache_io_hints()
1643 struct dm_writecache *wc = wb->wc; in writecache_writeback_endio() local
1646 raw_spin_lock_irqsave(&wc->endio_list_lock, flags); in writecache_writeback_endio()
1647 if (unlikely(list_empty(&wc->endio_list))) in writecache_writeback_endio()
1648 wake_up_process(wc->endio_thread); in writecache_writeback_endio()
1649 list_add_tail(&wb->endio_entry, &wc->endio_list); in writecache_writeback_endio()
1650 raw_spin_unlock_irqrestore(&wc->endio_list_lock, flags); in writecache_writeback_endio()
1656 struct dm_writecache *wc = c->wc; in writecache_copy_endio() local
1660 raw_spin_lock_irq(&wc->endio_list_lock); in writecache_copy_endio()
1661 if (unlikely(list_empty(&wc->endio_list))) in writecache_copy_endio()
1662 wake_up_process(wc->endio_thread); in writecache_copy_endio()
1663 list_add_tail(&c->endio_entry, &wc->endio_list); in writecache_copy_endio()
1664 raw_spin_unlock_irq(&wc->endio_list_lock); in writecache_copy_endio()
1667 static void __writecache_endio_pmem(struct dm_writecache *wc, struct list_head *list) in __writecache_endio_pmem() argument
1679 writecache_error(wc, blk_status_to_errno(wb->bio.bi_status), in __writecache_endio_pmem()
1687 if (!writecache_has_error(wc)) in __writecache_endio_pmem()
1688 writecache_free_entry(wc, e); in __writecache_endio_pmem()
1689 BUG_ON(!wc->writeback_size); in __writecache_endio_pmem()
1690 wc->writeback_size--; in __writecache_endio_pmem()
1693 writecache_commit_flushed(wc, false); in __writecache_endio_pmem()
1694 wc_unlock(wc); in __writecache_endio_pmem()
1695 wc_lock(wc); in __writecache_endio_pmem()
1706 static void __writecache_endio_ssd(struct dm_writecache *wc, struct list_head *list) in __writecache_endio_ssd() argument
1716 writecache_error(wc, c->error, "copy error"); in __writecache_endio_ssd()
1723 if (!writecache_has_error(wc)) in __writecache_endio_ssd()
1724 writecache_free_entry(wc, e); in __writecache_endio_ssd()
1726 BUG_ON(!wc->writeback_size); in __writecache_endio_ssd()
1727 wc->writeback_size--; in __writecache_endio_ssd()
1730 mempool_free(c, &wc->copy_pool); in __writecache_endio_ssd()
1736 struct dm_writecache *wc = data; in writecache_endio_thread() local
1741 raw_spin_lock_irq(&wc->endio_list_lock); in writecache_endio_thread()
1742 if (!list_empty(&wc->endio_list)) in writecache_endio_thread()
1745 raw_spin_unlock_irq(&wc->endio_list_lock); in writecache_endio_thread()
1757 list = wc->endio_list; in writecache_endio_thread()
1759 INIT_LIST_HEAD(&wc->endio_list); in writecache_endio_thread()
1760 raw_spin_unlock_irq(&wc->endio_list_lock); in writecache_endio_thread()
1762 if (!WC_MODE_FUA(wc)) in writecache_endio_thread()
1763 writecache_disk_flush(wc, wc->dev); in writecache_endio_thread()
1765 wc_lock(wc); in writecache_endio_thread()
1767 if (WC_MODE_PMEM(wc)) { in writecache_endio_thread()
1768 __writecache_endio_pmem(wc, &list); in writecache_endio_thread()
1770 __writecache_endio_ssd(wc, &list); in writecache_endio_thread()
1771 writecache_wait_for_ios(wc, READ); in writecache_endio_thread()
1774 writecache_commit_flushed(wc, false); in writecache_endio_thread()
1776 wc_unlock(wc); in writecache_endio_thread()
1784 struct dm_writecache *wc = wb->wc; in wc_add_block() local
1785 unsigned block_size = wc->block_size; in wc_add_block()
1786 void *address = memory_data(wc, e); in wc_add_block()
1790 if (unlikely(bio_end_sector(&wb->bio) >= wc->data_device_sectors)) in wc_add_block()
1802 static void __writeback_throttle(struct dm_writecache *wc, struct writeback_list *wbl) in __writeback_throttle() argument
1804 if (unlikely(wc->max_writeback_jobs)) { in __writeback_throttle()
1805 if (READ_ONCE(wc->writeback_size) - wbl->size >= wc->max_writeback_jobs) { in __writeback_throttle()
1806 wc_lock(wc); in __writeback_throttle()
1807 while (wc->writeback_size - wbl->size >= wc->max_writeback_jobs) in __writeback_throttle()
1808 writecache_wait_on_freelist(wc); in __writeback_throttle()
1809 wc_unlock(wc); in __writeback_throttle()
1815 static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeback_list *wbl) in __writecache_writeback_pmem() argument
1829 bio = bio_alloc_bioset(wc->dev->bdev, max_pages, REQ_OP_WRITE, in __writecache_writeback_pmem()
1830 GFP_NOIO, &wc->bio_set); in __writecache_writeback_pmem()
1832 wb->wc = wc; in __writecache_writeback_pmem()
1834 bio->bi_iter.bi_sector = read_original_sector(wc, e); in __writecache_writeback_pmem()
1850 if (read_original_sector(wc, f) != in __writecache_writeback_pmem()
1851 read_original_sector(wc, e) + (wc->block_size >> SECTOR_SHIFT)) in __writecache_writeback_pmem()
1860 if (WC_MODE_FUA(wc)) in __writecache_writeback_pmem()
1862 if (writecache_has_error(wc)) { in __writecache_writeback_pmem()
1872 __writeback_throttle(wc, wbl); in __writecache_writeback_pmem()
1876 static void __writecache_writeback_ssd(struct dm_writecache *wc, struct writeback_list *wbl) in __writecache_writeback_ssd() argument
1889 n_sectors = e->wc_list_contiguous << (wc->block_size_bits - SECTOR_SHIFT); in __writecache_writeback_ssd()
1891 from.bdev = wc->ssd_dev->bdev; in __writecache_writeback_ssd()
1892 from.sector = cache_sector(wc, e); in __writecache_writeback_ssd()
1894 to.bdev = wc->dev->bdev; in __writecache_writeback_ssd()
1895 to.sector = read_original_sector(wc, e); in __writecache_writeback_ssd()
1898 c = mempool_alloc(&wc->copy_pool, GFP_NOIO); in __writecache_writeback_ssd()
1899 c->wc = wc; in __writecache_writeback_ssd()
1903 while ((n_sectors -= wc->block_size >> SECTOR_SHIFT)) { in __writecache_writeback_ssd()
1911 if (unlikely(to.sector + to.count > wc->data_device_sectors)) { in __writecache_writeback_ssd()
1912 if (to.sector >= wc->data_device_sectors) { in __writecache_writeback_ssd()
1916 from.count = to.count = wc->data_device_sectors - to.sector; in __writecache_writeback_ssd()
1919 dm_kcopyd_copy(wc->dm_kcopyd, &from, 1, &to, 0, writecache_copy_endio, c); in __writecache_writeback_ssd()
1921 __writeback_throttle(wc, wbl); in __writecache_writeback_ssd()
1927 struct dm_writecache *wc = container_of(work, struct dm_writecache, writeback_work); in writecache_writeback() local
1935 if (!WC_MODE_PMEM(wc)) { in writecache_writeback()
1937 dm_kcopyd_client_flush(wc->dm_kcopyd); in writecache_writeback()
1940 if (likely(wc->pause != 0)) { in writecache_writeback()
1943 if (unlikely(wc->cleaner) || unlikely(wc->writeback_all) || in writecache_writeback()
1944 unlikely(dm_suspended(wc->ti))) in writecache_writeback()
1946 idle = dm_iot_idle_time(&wc->iot); in writecache_writeback()
1947 if (idle >= wc->pause) in writecache_writeback()
1949 idle = wc->pause - idle; in writecache_writeback()
1956 wc_lock(wc); in writecache_writeback()
1958 if (writecache_has_error(wc)) { in writecache_writeback()
1959 wc_unlock(wc); in writecache_writeback()
1963 if (unlikely(wc->writeback_all)) { in writecache_writeback()
1964 if (writecache_wait_for_writeback(wc)) in writecache_writeback()
1968 if (wc->overwrote_committed) { in writecache_writeback()
1969 writecache_wait_for_ios(wc, WRITE); in writecache_writeback()
1976 while (!list_empty(&wc->lru) && in writecache_writeback()
1977 (wc->writeback_all || in writecache_writeback()
1978 wc->freelist_size + wc->writeback_size <= wc->freelist_low_watermark || in writecache_writeback()
1979 (jiffies - container_of(wc->lru.prev, struct wc_entry, lru)->age >= in writecache_writeback()
1980 wc->max_age - wc->max_age / MAX_AGE_DIV))) { in writecache_writeback()
1984 likely(!wc->writeback_all)) { in writecache_writeback()
1985 if (likely(!dm_suspended(wc->ti))) in writecache_writeback()
1986 queue_work(wc->writeback_wq, &wc->writeback_work); in writecache_writeback()
1990 if (unlikely(wc->writeback_all)) { in writecache_writeback()
1992 writecache_flush(wc); in writecache_writeback()
1993 e = container_of(rb_first(&wc->tree), struct wc_entry, rb_node); in writecache_writeback()
1997 e = container_of(wc->lru.prev, struct wc_entry, lru); in writecache_writeback()
1999 if (unlikely(!writecache_entry_is_committed(wc, e))) { in writecache_writeback()
2000 writecache_flush(wc); in writecache_writeback()
2005 if (unlikely(read_original_sector(wc, f) == in writecache_writeback()
2006 read_original_sector(wc, e))) { in writecache_writeback()
2013 wc->writeback_size++; in writecache_writeback()
2026 if (unlikely(read_original_sector(wc, g) == in writecache_writeback()
2027 read_original_sector(wc, f))) { in writecache_writeback()
2031 if (read_original_sector(wc, g) != in writecache_writeback()
2032 read_original_sector(wc, f) + (wc->block_size >> SECTOR_SHIFT)) in writecache_writeback()
2036 if (unlikely(!writecache_entry_is_committed(wc, g))) in writecache_writeback()
2039 if (!WC_MODE_PMEM(wc)) { in writecache_writeback()
2045 //if (unlikely(n_walked > WRITEBACK_LATENCY) && likely(!wc->writeback_all)) in writecache_writeback()
2048 wc->writeback_size++; in writecache_writeback()
2056 if (unlikely(wc->writeback_all)) { in writecache_writeback()
2068 list_splice_tail(&skipped, &wc->lru); in writecache_writeback()
2074 writecache_wait_for_writeback(wc); in writecache_writeback()
2077 wc_unlock(wc); in writecache_writeback()
2081 if (WC_MODE_PMEM(wc)) in writecache_writeback()
2082 __writecache_writeback_pmem(wc, &wbl); in writecache_writeback()
2084 __writecache_writeback_ssd(wc, &wbl); in writecache_writeback()
2088 if (unlikely(wc->writeback_all)) { in writecache_writeback()
2089 wc_lock(wc); in writecache_writeback()
2090 while (writecache_wait_for_writeback(wc)); in writecache_writeback()
2091 wc_unlock(wc); in writecache_writeback()
2130 static int init_memory(struct dm_writecache *wc) in init_memory() argument
2135 r = calculate_memory_size(wc->memory_map_size, wc->block_size, &wc->n_blocks, NULL); in init_memory()
2139 r = writecache_alloc_entries(wc); in init_memory()
2143 for (b = 0; b < ARRAY_SIZE(sb(wc)->padding); b++) in init_memory()
2144 pmem_assign(sb(wc)->padding[b], cpu_to_le64(0)); in init_memory()
2145 pmem_assign(sb(wc)->version, cpu_to_le32(MEMORY_SUPERBLOCK_VERSION)); in init_memory()
2146 pmem_assign(sb(wc)->block_size, cpu_to_le32(wc->block_size)); in init_memory()
2147 pmem_assign(sb(wc)->n_blocks, cpu_to_le64(wc->n_blocks)); in init_memory()
2148 pmem_assign(sb(wc)->seq_count, cpu_to_le64(0)); in init_memory()
2150 for (b = 0; b < wc->n_blocks; b++) { in init_memory()
2151 write_original_sector_seq_count(wc, &wc->entries[b], -1, -1); in init_memory()
2155 writecache_flush_all_metadata(wc); in init_memory()
2156 writecache_commit_flushed(wc, false); in init_memory()
2157 pmem_assign(sb(wc)->magic, cpu_to_le32(MEMORY_SUPERBLOCK_MAGIC)); in init_memory()
2158 writecache_flush_region(wc, &sb(wc)->magic, sizeof sb(wc)->magic); in init_memory()
2159 writecache_commit_flushed(wc, false); in init_memory()
2166 struct dm_writecache *wc = ti->private; in writecache_dtr() local
2168 if (!wc) in writecache_dtr()
2171 if (wc->endio_thread) in writecache_dtr()
2172 kthread_stop(wc->endio_thread); in writecache_dtr()
2174 if (wc->flush_thread) in writecache_dtr()
2175 kthread_stop(wc->flush_thread); in writecache_dtr()
2177 bioset_exit(&wc->bio_set); in writecache_dtr()
2179 mempool_exit(&wc->copy_pool); in writecache_dtr()
2181 if (wc->writeback_wq) in writecache_dtr()
2182 destroy_workqueue(wc->writeback_wq); in writecache_dtr()
2184 if (wc->dev) in writecache_dtr()
2185 dm_put_device(ti, wc->dev); in writecache_dtr()
2187 if (wc->ssd_dev) in writecache_dtr()
2188 dm_put_device(ti, wc->ssd_dev); in writecache_dtr()
2190 vfree(wc->entries); in writecache_dtr()
2192 if (wc->memory_map) { in writecache_dtr()
2193 if (WC_MODE_PMEM(wc)) in writecache_dtr()
2194 persistent_memory_release(wc); in writecache_dtr()
2196 vfree(wc->memory_map); in writecache_dtr()
2199 if (wc->dm_kcopyd) in writecache_dtr()
2200 dm_kcopyd_client_destroy(wc->dm_kcopyd); in writecache_dtr()
2202 if (wc->dm_io) in writecache_dtr()
2203 dm_io_client_destroy(wc->dm_io); in writecache_dtr()
2205 vfree(wc->dirty_bitmap); in writecache_dtr()
2207 kfree(wc); in writecache_dtr()
2212 struct dm_writecache *wc; in writecache_ctr() local
2231 wc = kzalloc(sizeof(struct dm_writecache), GFP_KERNEL); in writecache_ctr()
2232 if (!wc) { in writecache_ctr()
2237 ti->private = wc; in writecache_ctr()
2238 wc->ti = ti; in writecache_ctr()
2240 mutex_init(&wc->lock); in writecache_ctr()
2241 wc->max_age = MAX_AGE_UNSPECIFIED; in writecache_ctr()
2242 writecache_poison_lists(wc); in writecache_ctr()
2243 init_waitqueue_head(&wc->freelist_wait); in writecache_ctr()
2244 timer_setup(&wc->autocommit_timer, writecache_autocommit_timer, 0); in writecache_ctr()
2245 timer_setup(&wc->max_age_timer, writecache_max_age_timer, 0); in writecache_ctr()
2248 atomic_set(&wc->bio_in_progress[i], 0); in writecache_ctr()
2249 init_waitqueue_head(&wc->bio_in_progress_wait[i]); in writecache_ctr()
2252 wc->dm_io = dm_io_client_create(); in writecache_ctr()
2253 if (IS_ERR(wc->dm_io)) { in writecache_ctr()
2254 r = PTR_ERR(wc->dm_io); in writecache_ctr()
2256 wc->dm_io = NULL; in writecache_ctr()
2260 wc->writeback_wq = alloc_workqueue("writecache-writeback", WQ_MEM_RECLAIM, 1); in writecache_ctr()
2261 if (!wc->writeback_wq) { in writecache_ctr()
2266 INIT_WORK(&wc->writeback_work, writecache_writeback); in writecache_ctr()
2267 INIT_WORK(&wc->flush_work, writecache_flush_work); in writecache_ctr()
2269 dm_iot_init(&wc->iot); in writecache_ctr()
2271 raw_spin_lock_init(&wc->endio_list_lock); in writecache_ctr()
2272 INIT_LIST_HEAD(&wc->endio_list); in writecache_ctr()
2273 wc->endio_thread = kthread_run(writecache_endio_thread, wc, "writecache_endio"); in writecache_ctr()
2274 if (IS_ERR(wc->endio_thread)) { in writecache_ctr()
2275 r = PTR_ERR(wc->endio_thread); in writecache_ctr()
2276 wc->endio_thread = NULL; in writecache_ctr()
2289 wc->pmem_mode = false; in writecache_ctr()
2292 wc->pmem_mode = true; in writecache_ctr()
2293 wc->writeback_fua = true; in writecache_ctr()
2308 if (WC_MODE_PMEM(wc)) { in writecache_ctr()
2309 r = bioset_init(&wc->bio_set, BIO_POOL_SIZE, in writecache_ctr()
2317 wc->pause = PAUSE_WRITEBACK; in writecache_ctr()
2318 r = mempool_init_kmalloc_pool(&wc->copy_pool, 1, sizeof(struct copy_struct)); in writecache_ctr()
2331 r = dm_get_device(ti, string, dm_table_get_mode(ti->table), &wc->dev); in writecache_ctr()
2344 r = dm_get_device(ti, string, dm_table_get_mode(ti->table), &wc->ssd_dev); in writecache_ctr()
2349 wc->memory_map_size = bdev_nr_bytes(wc->ssd_dev->bdev); in writecache_ctr()
2357 if (sscanf(string, "%u%c", &wc->block_size, &dummy) != 1 || in writecache_ctr()
2358 wc->block_size < 512 || wc->block_size > PAGE_SIZE || in writecache_ctr()
2359 (wc->block_size & (wc->block_size - 1))) { in writecache_ctr()
2364 if (wc->block_size < bdev_logical_block_size(wc->dev->bdev) || in writecache_ctr()
2365 wc->block_size < bdev_logical_block_size(wc->ssd_dev->bdev)) { in writecache_ctr()
2370 wc->block_size_bits = __ffs(wc->block_size); in writecache_ctr()
2372 wc->max_writeback_jobs = MAX_WRITEBACK_JOBS; in writecache_ctr()
2373 wc->autocommit_blocks = !WC_MODE_PMEM(wc) ? AUTOCOMMIT_BLOCKS_SSD : AUTOCOMMIT_BLOCKS_PMEM; in writecache_ctr()
2374 wc->autocommit_jiffies = msecs_to_jiffies(AUTOCOMMIT_MSEC); in writecache_ctr()
2390 wc->start_sector = start_sector; in writecache_ctr()
2391 wc->start_sector_set = true; in writecache_ctr()
2392 if (wc->start_sector != start_sector || in writecache_ctr()
2393 wc->start_sector >= wc->memory_map_size >> SECTOR_SHIFT) in writecache_ctr()
2401 wc->high_wm_percent_value = high_wm_percent; in writecache_ctr()
2402 wc->high_wm_percent_set = true; in writecache_ctr()
2409 wc->low_wm_percent_value = low_wm_percent; in writecache_ctr()
2410 wc->low_wm_percent_set = true; in writecache_ctr()
2413 if (sscanf(string, "%u%c", &wc->max_writeback_jobs, &dummy) != 1) in writecache_ctr()
2415 wc->max_writeback_jobs_set = true; in writecache_ctr()
2418 if (sscanf(string, "%u%c", &wc->autocommit_blocks, &dummy) != 1) in writecache_ctr()
2420 wc->autocommit_blocks_set = true; in writecache_ctr()
2428 wc->autocommit_jiffies = msecs_to_jiffies(autocommit_msecs); in writecache_ctr()
2429 wc->autocommit_time_value = autocommit_msecs; in writecache_ctr()
2430 wc->autocommit_time_set = true; in writecache_ctr()
2438 wc->max_age = msecs_to_jiffies(max_age_msecs); in writecache_ctr()
2439 wc->max_age_set = true; in writecache_ctr()
2440 wc->max_age_value = max_age_msecs; in writecache_ctr()
2442 wc->cleaner_set = true; in writecache_ctr()
2443 wc->cleaner = true; in writecache_ctr()
2445 if (WC_MODE_PMEM(wc)) { in writecache_ctr()
2446 wc->writeback_fua = true; in writecache_ctr()
2447 wc->writeback_fua_set = true; in writecache_ctr()
2450 if (WC_MODE_PMEM(wc)) { in writecache_ctr()
2451 wc->writeback_fua = false; in writecache_ctr()
2452 wc->writeback_fua_set = true; in writecache_ctr()
2455 wc->metadata_only = true; in writecache_ctr()
2458 if (WC_MODE_PMEM(wc)) in writecache_ctr()
2465 wc->pause = msecs_to_jiffies(pause_msecs); in writecache_ctr()
2466 wc->pause_set = true; in writecache_ctr()
2467 wc->pause_value = pause_msecs; in writecache_ctr()
2482 if (WC_MODE_PMEM(wc)) { in writecache_ctr()
2483 if (!dax_synchronous(wc->ssd_dev->dax_dev)) { in writecache_ctr()
2489 r = persistent_memory_claim(wc); in writecache_ctr()
2498 wc->memory_map_size -= (uint64_t)wc->start_sector << SECTOR_SHIFT; in writecache_ctr()
2500 bio_list_init(&wc->flush_list); in writecache_ctr()
2501 wc->flush_thread = kthread_run(writecache_flush_thread, wc, "dm_writecache_flush"); in writecache_ctr()
2502 if (IS_ERR(wc->flush_thread)) { in writecache_ctr()
2503 r = PTR_ERR(wc->flush_thread); in writecache_ctr()
2504 wc->flush_thread = NULL; in writecache_ctr()
2509 r = calculate_memory_size(wc->memory_map_size, wc->block_size, in writecache_ctr()
2516 n_bitmap_bits = (((uint64_t)n_metadata_blocks << wc->block_size_bits) + in writecache_ctr()
2525 wc->memory_map = vmalloc(n_metadata_blocks << wc->block_size_bits); in writecache_ctr()
2526 if (!wc->memory_map) { in writecache_ctr()
2532 wc->dm_kcopyd = dm_kcopyd_client_create(&dm_kcopyd_throttle); in writecache_ctr()
2533 if (IS_ERR(wc->dm_kcopyd)) { in writecache_ctr()
2534 r = PTR_ERR(wc->dm_kcopyd); in writecache_ctr()
2536 wc->dm_kcopyd = NULL; in writecache_ctr()
2540 wc->metadata_sectors = n_metadata_blocks << (wc->block_size_bits - SECTOR_SHIFT); in writecache_ctr()
2541 wc->dirty_bitmap_size = (n_bitmap_bits + BITS_PER_LONG - 1) / in writecache_ctr()
2543 wc->dirty_bitmap = vzalloc(wc->dirty_bitmap_size); in writecache_ctr()
2544 if (!wc->dirty_bitmap) { in writecache_ctr()
2550 r = writecache_read_metadata(wc, wc->block_size >> SECTOR_SHIFT); in writecache_ctr()
2557 r = copy_mc_to_kernel(&s, sb(wc), sizeof(struct wc_memory_superblock)); in writecache_ctr()
2563 r = init_memory(wc); in writecache_ctr()
2568 r = copy_mc_to_kernel(&s, sb(wc), in writecache_ctr()
2588 if (le32_to_cpu(s.block_size) != wc->block_size) { in writecache_ctr()
2594 wc->n_blocks = le64_to_cpu(s.n_blocks); in writecache_ctr()
2596 offset = wc->n_blocks * sizeof(struct wc_memory_entry); in writecache_ctr()
2597 if (offset / sizeof(struct wc_memory_entry) != le64_to_cpu(sb(wc)->n_blocks)) { in writecache_ctr()
2606 offset = (offset + wc->block_size - 1) & ~(size_t)(wc->block_size - 1); in writecache_ctr()
2607 data_size = wc->n_blocks * (size_t)wc->block_size; in writecache_ctr()
2608 if (!offset || (data_size / wc->block_size != wc->n_blocks) || in writecache_ctr()
2611 if (offset + data_size > wc->memory_map_size) { in writecache_ctr()
2617 wc->metadata_sectors = offset >> SECTOR_SHIFT; in writecache_ctr()
2618 wc->block_start = (char *)sb(wc) + offset; in writecache_ctr()
2620 x = (uint64_t)wc->n_blocks * (100 - high_wm_percent); in writecache_ctr()
2623 wc->freelist_high_watermark = x; in writecache_ctr()
2624 x = (uint64_t)wc->n_blocks * (100 - low_wm_percent); in writecache_ctr()
2627 wc->freelist_low_watermark = x; in writecache_ctr()
2629 if (wc->cleaner) in writecache_ctr()
2630 activate_cleaner(wc); in writecache_ctr()
2632 r = writecache_alloc_entries(wc); in writecache_ctr()
2638 ti->num_flush_bios = WC_MODE_PMEM(wc) ? 1 : 2; in writecache_ctr()
2642 if (WC_MODE_PMEM(wc)) in writecache_ctr()
2643 persistent_memory_flush_cache(wc->memory_map, wc->memory_map_size); in writecache_ctr()
2658 struct dm_writecache *wc = ti->private; in writecache_status() local
2665 writecache_has_error(wc), in writecache_status()
2666 (unsigned long long)wc->n_blocks, (unsigned long long)wc->freelist_size, in writecache_status()
2667 (unsigned long long)wc->writeback_size, in writecache_status()
2668 wc->stats.reads, in writecache_status()
2669 wc->stats.read_hits, in writecache_status()
2670 wc->stats.writes, in writecache_status()
2671 wc->stats.write_hits_uncommitted, in writecache_status()
2672 wc->stats.write_hits_committed, in writecache_status()
2673 wc->stats.writes_around, in writecache_status()
2674 wc->stats.writes_allocate, in writecache_status()
2675 wc->stats.writes_blocked_on_freelist, in writecache_status()
2676 wc->stats.flushes, in writecache_status()
2677 wc->stats.discards); in writecache_status()
2680 DMEMIT("%c %s %s %u ", WC_MODE_PMEM(wc) ? 'p' : 's', in writecache_status()
2681 wc->dev->name, wc->ssd_dev->name, wc->block_size); in writecache_status()
2683 if (wc->start_sector_set) in writecache_status()
2685 if (wc->high_wm_percent_set) in writecache_status()
2687 if (wc->low_wm_percent_set) in writecache_status()
2689 if (wc->max_writeback_jobs_set) in writecache_status()
2691 if (wc->autocommit_blocks_set) in writecache_status()
2693 if (wc->autocommit_time_set) in writecache_status()
2695 if (wc->max_age_set) in writecache_status()
2697 if (wc->cleaner_set) in writecache_status()
2699 if (wc->writeback_fua_set) in writecache_status()
2701 if (wc->metadata_only) in writecache_status()
2703 if (wc->pause_set) in writecache_status()
2707 if (wc->start_sector_set) in writecache_status()
2708 DMEMIT(" start_sector %llu", (unsigned long long)wc->start_sector); in writecache_status()
2709 if (wc->high_wm_percent_set) in writecache_status()
2710 DMEMIT(" high_watermark %u", wc->high_wm_percent_value); in writecache_status()
2711 if (wc->low_wm_percent_set) in writecache_status()
2712 DMEMIT(" low_watermark %u", wc->low_wm_percent_value); in writecache_status()
2713 if (wc->max_writeback_jobs_set) in writecache_status()
2714 DMEMIT(" writeback_jobs %u", wc->max_writeback_jobs); in writecache_status()
2715 if (wc->autocommit_blocks_set) in writecache_status()
2716 DMEMIT(" autocommit_blocks %u", wc->autocommit_blocks); in writecache_status()
2717 if (wc->autocommit_time_set) in writecache_status()
2718 DMEMIT(" autocommit_time %u", wc->autocommit_time_value); in writecache_status()
2719 if (wc->max_age_set) in writecache_status()
2720 DMEMIT(" max_age %u", wc->max_age_value); in writecache_status()
2721 if (wc->cleaner_set) in writecache_status()
2723 if (wc->writeback_fua_set) in writecache_status()
2724 DMEMIT(" %sfua", wc->writeback_fua ? "" : "no"); in writecache_status()
2725 if (wc->metadata_only) in writecache_status()
2727 if (wc->pause_set) in writecache_status()
2728 DMEMIT(" pause_writeback %u", wc->pause_value); in writecache_status()