diff options
| -rw-r--r-- | drivers/md/bcache/Makefile | 5 | ||||
| -rw-r--r-- | drivers/md/bcache/bset.c | 279 | ||||
| -rw-r--r-- | drivers/md/bcache/bset.h | 8 | ||||
| -rw-r--r-- | drivers/md/bcache/btree.c | 6 | ||||
| -rw-r--r-- | drivers/md/bcache/btree.h | 42 | ||||
| -rw-r--r-- | drivers/md/bcache/debug.c | 1 | ||||
| -rw-r--r-- | drivers/md/bcache/extents.c | 354 | ||||
| -rw-r--r-- | drivers/md/bcache/extents.h | 12 | ||||
| -rw-r--r-- | drivers/md/bcache/super.c | 5 |
9 files changed, 423 insertions, 289 deletions
diff --git a/drivers/md/bcache/Makefile b/drivers/md/bcache/Makefile index 0e9c825..c488b84 100644 --- a/drivers/md/bcache/Makefile +++ b/drivers/md/bcache/Makefile @@ -1,7 +1,8 @@ obj-$(CONFIG_BCACHE) += bcache.o -bcache-y := alloc.o btree.o bset.o io.o journal.o writeback.o\ - movinggc.o request.o super.o sysfs.o debug.o util.o trace.o stats.o closure.o +bcache-y := alloc.o bset.o btree.o closure.o debug.o extents.o\ + io.o journal.o movinggc.o request.o stats.o super.o sysfs.o trace.o\ + util.o writeback.o CFLAGS_request.o += -Iblock diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index e04e590..c2c42cb 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -63,140 +63,6 @@ void bch_keylist_pop_front(struct keylist *l) bch_keylist_bytes(l)); } -/* Pointer validation */ - -static bool __ptr_invalid(struct cache_set *c, const struct bkey *k) -{ - unsigned i; - - for (i = 0; i < KEY_PTRS(k); i++) - if (ptr_available(c, k, i)) { - struct cache *ca = PTR_CACHE(c, k, i); - size_t bucket = PTR_BUCKET_NR(c, k, i); - size_t r = bucket_remainder(c, PTR_OFFSET(k, i)); - - if (KEY_SIZE(k) + r > c->sb.bucket_size || - bucket < ca->sb.first_bucket || - bucket >= ca->sb.nbuckets) - return true; - } - - return false; -} - -bool bch_btree_ptr_invalid(struct cache_set *c, const struct bkey *k) -{ - char buf[80]; - - if (!KEY_PTRS(k) || !KEY_SIZE(k) || KEY_DIRTY(k)) - goto bad; - - if (__ptr_invalid(c, k)) - goto bad; - - return false; -bad: - bch_bkey_to_text(buf, sizeof(buf), k); - cache_bug(c, "spotted btree ptr %s: %s", buf, bch_ptr_status(c, k)); - return true; -} - -bool bch_extent_ptr_invalid(struct cache_set *c, const struct bkey *k) -{ - char buf[80]; - - if (!KEY_SIZE(k)) - return true; - - if (KEY_SIZE(k) > KEY_OFFSET(k)) - goto bad; - - if (__ptr_invalid(c, k)) - goto bad; - - return false; -bad: - bch_bkey_to_text(buf, sizeof(buf), k); - cache_bug(c, "spotted extent %s: %s", buf, bch_ptr_status(c, k)); - return true; -} - -static bool ptr_bad_expensive_checks(struct btree *b, const struct bkey *k, - unsigned ptr) -{ - struct bucket *g = PTR_BUCKET(b->c, k, ptr); - char buf[80]; - - if (mutex_trylock(&b->c->bucket_lock)) { - if (b->level) { - if (KEY_DIRTY(k) || - g->prio != BTREE_PRIO || - (b->c->gc_mark_valid && - GC_MARK(g) != GC_MARK_METADATA)) - goto err; - - } else { - if (g->prio == BTREE_PRIO) - goto err; - - if (KEY_DIRTY(k) && - b->c->gc_mark_valid && - GC_MARK(g) != GC_MARK_DIRTY) - goto err; - } - mutex_unlock(&b->c->bucket_lock); - } - - return false; -err: - mutex_unlock(&b->c->bucket_lock); - bch_bkey_to_text(buf, sizeof(buf), k); - btree_bug(b, -"inconsistent pointer %s: bucket %zu pin %i prio %i gen %i last_gc %i mark %llu gc_gen %i", - buf, PTR_BUCKET_NR(b->c, k, ptr), atomic_read(&g->pin), - g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen); - return true; -} - -bool bch_ptr_bad(struct btree *b, const struct bkey *k) -{ - struct bucket *g; - unsigned i, stale; - - if (!bkey_cmp(k, &ZERO_KEY) || - !KEY_PTRS(k) || - bch_ptr_invalid(b, k)) - return true; - - for (i = 0; i < KEY_PTRS(k); i++) - if (!ptr_available(b->c, k, i)) - return true; - - if (!expensive_debug_checks(b->c) && KEY_DIRTY(k)) - return false; - - for (i = 0; i < KEY_PTRS(k); i++) { - g = PTR_BUCKET(b->c, k, i); - stale = ptr_stale(b->c, k, i); - - btree_bug_on(stale > 96, b, - "key too stale: %i, need_gc %u", - stale, b->c->need_gc); - - btree_bug_on(stale && KEY_DIRTY(k) && KEY_SIZE(k), - b, "stale dirty pointer"); - - if (stale) - return true; - - if (expensive_debug_checks(b->c) && - ptr_bad_expensive_checks(b, k, i)) - return true; - } - - return false; -} - /* Key/pointer manipulation */ void bch_bkey_copy_single_ptr(struct bkey *dest, const struct bkey *src, @@ -251,57 +117,6 @@ bool __bch_cut_back(const struct bkey *where, struct bkey *k) return true; } -static uint64_t merge_chksums(struct bkey *l, struct bkey *r) -{ - return (l->ptr[KEY_PTRS(l)] + r->ptr[KEY_PTRS(r)]) & - ~((uint64_t)1 << 63); -} - -/* Tries to merge l and r: l should be lower than r - * Returns true if we were able to merge. If we did merge, l will be the merged - * key, r will be untouched. - */ -bool bch_bkey_try_merge(struct btree *b, struct bkey *l, struct bkey *r) -{ - unsigned i; - - if (key_merging_disabled(b->c)) - return false; - - if (KEY_PTRS(l) != KEY_PTRS(r) || - KEY_DIRTY(l) != KEY_DIRTY(r) || - bkey_cmp(l, &START_KEY(r))) - return false; - - for (i = 0; i < KEY_PTRS(l); i++) - if (l->ptr[i] + PTR(0, KEY_SIZE(l), 0) != r->ptr[i] || - PTR_BUCKET_NR(b->c, l, i) != PTR_BUCKET_NR(b->c, r, i)) - return false; - - /* Keys with no pointers aren't restricted to one bucket and could - * overflow KEY_SIZE - */ - if (KEY_SIZE(l) + KEY_SIZE(r) > USHRT_MAX) { - SET_KEY_OFFSET(l, KEY_OFFSET(l) + USHRT_MAX - KEY_SIZE(l)); - SET_KEY_SIZE(l, USHRT_MAX); - - bch_cut_front(l, r); - return false; - } - - if (KEY_CSUM(l)) { - if (KEY_CSUM(r)) - l->ptr[KEY_PTRS(l)] = merge_chksums(l, r); - else - SET_KEY_CSUM(l, 0); - } - - SET_KEY_OFFSET(l, KEY_OFFSET(l) + KEY_SIZE(r)); - SET_KEY_SIZE(l, KEY_SIZE(l) + KEY_SIZE(r)); - - return true; -} - /* Auxiliary search trees */ /* 32 bits total: */ @@ -1099,85 +914,6 @@ int bch_bset_sort_state_init(struct bset_sort_state *state, unsigned page_order) return 0; } -static void sort_key_next(struct btree_iter *iter, - struct btree_iter_set *i) -{ - i->k = bkey_next(i->k); - - if (i->k == i->end) - *i = iter->data[--iter->used]; -} - -/* - * Returns true if l > r - unless l == r, in which case returns true if l is - * older than r. - * - * Necessary for btree_sort_fixup() - if there are multiple keys that compare - * equal in different sets, we have to process them newest to oldest. - */ -static inline bool sort_extent_cmp(struct btree_iter_set l, - struct btree_iter_set r) -{ - int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(r.k)); - - return c ? c > 0 : l.k < r.k; -} - -static inline bool sort_cmp(struct btree_iter_set l, - struct btree_iter_set r) -{ - int64_t c = bkey_cmp(l.k, r.k); - - return c ? c > 0 : l.k < r.k; -} - -static struct bkey *btree_sort_fixup_extents(struct btree_iter *iter, - struct bkey *tmp) -{ - while (iter->used > 1) { - struct btree_iter_set *top = iter->data, *i = top + 1; - - if (iter->used > 2 && - sort_extent_cmp(i[0], i[1])) - i++; - - if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) - break; - - if (!KEY_SIZE(i->k)) { - sort_key_next(iter, i); - heap_sift(iter, i - top, sort_extent_cmp); - continue; - } - - if (top->k > i->k) { - if (bkey_cmp(top->k, i->k) >= 0) - sort_key_next(iter, i); - else - bch_cut_front(top->k, i->k); - - heap_sift(iter, i - top, sort_extent_cmp); - } else { - /* can't happen because of comparison func */ - BUG_ON(!bkey_cmp(&START_KEY(top->k), &START_KEY(i->k))); - - if (bkey_cmp(i->k, top->k) < 0) { - bkey_copy(tmp, top->k); - - bch_cut_back(&START_KEY(i->k), tmp); - bch_cut_front(i->k, top->k); - heap_sift(iter, 0, btree_iter_cmp); - - return tmp; - } else { - bch_cut_back(&START_KEY(i->k), top->k); - } - } - } - - return NULL; -} - static void btree_mergesort(struct btree *b, struct bset *out, struct btree_iter *iter, bool fixup, bool remove_stale) @@ -1185,25 +921,22 @@ static void btree_mergesort(struct btree *b, struct bset *out, int i; struct bkey *k, *last = NULL; BKEY_PADDED(k) tmp; - btree_iter_cmp_fn *cmp = b->level - ? sort_cmp - : sort_extent_cmp; bool (*bad)(struct btree *, const struct bkey *) = remove_stale ? bch_ptr_bad : bch_ptr_invalid; /* Heapify the iterator, using our comparison function */ for (i = iter->used / 2 - 1; i >= 0; --i) - heap_sift(iter, i, cmp); + heap_sift(iter, i, b->ops->sort_cmp); while (!btree_iter_end(iter)) { - if (fixup && !b->level) - k = btree_sort_fixup_extents(iter, &tmp.k); + if (b->ops->sort_fixup && fixup) + k = b->ops->sort_fixup(iter, &tmp.k); else k = NULL; if (!k) - k = __bch_btree_iter_next(iter, cmp); + k = __bch_btree_iter_next(iter, b->ops->sort_cmp); if (bad(b, k)) continue; @@ -1211,8 +944,7 @@ static void btree_mergesort(struct btree *b, struct bset *out, if (!last) { last = out->start; bkey_copy(last, k); - } else if (b->level || - !bch_bkey_try_merge(b, last, k)) { + } else if (!bch_bkey_try_merge(b, last, k)) { last = bkey_next(last); bkey_copy(last, k); } @@ -1300,6 +1032,7 @@ void bch_btree_sort_partial(struct btree *b, unsigned start, EBUG_ON(b->written && oldsize >= 0 && bch_count_data(b) != oldsize); } +EXPORT_SYMBOL(bch_btree_sort_partial); void bch_btree_sort_and_fix_extents(struct btree *b, struct btree_iter *iter, struct bset_sort_state *state) diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index ab31f3f..b579712 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -376,14 +376,6 @@ int __bch_keylist_realloc(struct keylist *, unsigned); struct cache_set; const char *bch_ptr_status(struct cache_set *, const struct bkey *); -bool bch_btree_ptr_invalid(struct cache_set *, const struct bkey *); -bool bch_extent_ptr_invalid(struct cache_set *, const struct bkey *); -bool bch_btree_ptr_bad(struct btree *, const struct bkey *); -bool bch_extent_ptr_bad(struct btree *, const struct bkey *); - -bool bch_ptr_bad(struct btree *, const struct bkey *); - -bool bch_bkey_try_merge(struct btree *, struct bkey *, struct bkey *); int bch_bset_print_stats(struct cache_set *, char *); diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 89252e7..6734e27 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -23,6 +23,7 @@ #include "bcache.h" #include "btree.h" #include "debug.h" +#include "extents.h" #include "writeback.h" #include <linux/slab.h> @@ -931,6 +932,11 @@ out: b->level = level; b->parent = (void *) ~0UL; + if (!b->level) + b->ops = &bch_extent_keys_ops; + else + b->ops = &bch_btree_keys_ops; + mca_reinit(b); return b; diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h index b354117..0b43607 100644 --- a/drivers/md/bcache/btree.h +++ b/drivers/md/bcache/btree.h @@ -113,7 +113,28 @@ struct btree_write { int prio_blocked; }; +struct btree_keys_ops { + bool (*sort_cmp)(struct btree_iter_set, + struct btree_iter_set); + struct bkey *(*sort_fixup)(struct btree_iter *, + struct bkey *); + bool (*key_invalid)(struct btree *, + const struct bkey *); + bool (*key_bad)(struct btree *, + const struct bkey *); + bool (*key_merge)(struct btree *, + struct bkey *, struct bkey *); + + + /* + * Only used for deciding whether to use START_KEY(k) or just the key + * itself in a couple places + */ + bool is_extents; +}; + struct btree { + const struct btree_keys_ops *ops; /* Hottest entries first */ struct hlist_node hash; @@ -232,10 +253,23 @@ static inline void set_gc_sectors(struct cache_set *c) static inline bool bch_ptr_invalid(struct btree *b, const struct bkey *k) { - if (b->level) - return bch_btree_ptr_invalid(b->c, k); - else - return bch_extent_ptr_invalid(b->c, k); + return b->ops->key_invalid(b, k); +} + +static inline bool bch_ptr_bad(struct btree *b, const struct bkey *k) +{ + return b->ops->key_bad(b, k); +} + +/* + * Tries to merge l and r: l should be lower than r + * Returns true if we were able to merge. If we did merge, l will be the merged + * key, r will be untouched. + */ +static inline bool bch_bkey_try_merge(struct btree *b, + struct bkey *l, struct bkey *r) +{ + return b->ops->key_merge ? b->ops->key_merge(b, l, r) : false; } void bkey_put(struct cache_set *c, struct bkey *k); diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c index 5a78137..2c6587d 100644 --- a/drivers/md/bcache/debug.c +++ b/drivers/md/bcache/debug.c @@ -145,6 +145,7 @@ void bch_btree_verify(struct btree *b) bkey_copy(&v->key, &b->key); v->written = 0; v->level = b->level; + v->ops = b->ops; bio = bch_bbio_alloc(b->c); bio->bi_bdev = PTR_CACHE(b->c, &b->key, 0)->bdev; diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c new file mode 100644 index 0000000..8fe6aae --- /dev/null +++ b/drivers/md/bcache/extents.c @@ -0,0 +1,354 @@ +/* + * Copyright (C) 2010 Kent Overstreet <kent.overstreet@gmail.com> + * + * Uses a block device as cache for other block devices; optimized for SSDs. + * All allocation is done in buckets, which should match the erase block size + * of the device. + * + * Buckets containing cached data are kept on a heap sorted by priority; + * bucket priority is increased on cache hit, and periodically all the buckets + * on the heap have their priority scaled down. This currently is just used as + * an LRU but in the future should allow for more intelligent heuristics. + * + * Buckets have an 8 bit counter; freeing is accomplished by incrementing the + * counter. Garbage collection is used to remove stale pointers. + * + * Indexing is done via a btree; nodes are not necessarily fully sorted, rather + * as keys are inserted we only sort the pages that have not yet been written. + * When garbage collection is run, we resort the entire node. + * + * All configuration is done via sysfs; see Documentation/bcache.txt. + */ + +#include "bcache.h" +#include "btree.h" +#include "debug.h" +#include "extents.h" +#include "writeback.h" + +static void sort_key_next(struct btree_iter *iter, + struct btree_iter_set *i) +{ + i->k = bkey_next(i->k); + + if (i->k == i->end) + *i = iter->data[--iter->used]; +} + +static bool bch_key_sort_cmp(struct btree_iter_set l, + struct btree_iter_set r) +{ + int64_t c = bkey_cmp(l.k, r.k); + + return c ? c > 0 : l.k < r.k; +} + +static bool __ptr_invalid(struct cache_set *c, const struct bkey *k) +{ + unsigned i; + + for (i = 0; i < KEY_PTRS(k); i++) + if (ptr_available(c, k, i)) { + struct cache *ca = PTR_CACHE(c, k, i); + size_t bucket = PTR_BUCKET_NR(c, k, i); + size_t r = bucket_remainder(c, PTR_OFFSET(k, i)); + + if (KEY_SIZE(k) + r > c->sb.bucket_size || + bucket < ca->sb.first_bucket || + bucket >= ca->sb.nbuckets) + return true; + } + + return false; +} + +/* Btree ptrs */ + +bool __bch_btree_ptr_invalid(struct cache_set *c, const struct bkey *k) +{ + char buf[80]; + + if (!KEY_PTRS(k) || !KEY_SIZE(k) || KEY_DIRTY(k)) + goto bad; + + if (__ptr_invalid(c, k)) + goto bad; + + return false; +bad: + bch_bkey_to_text(buf, sizeof(buf), k); + cache_bug(c, "spotted btree ptr %s: %s", buf, bch_ptr_status(c, k)); + return true; +} + +static bool bch_btree_ptr_invalid(struct btree *b, const struct bkey *k) +{ + return __bch_btree_ptr_invalid(b->c, k); +} + +static bool btree_ptr_bad_expensive(struct btree *b, const struct bkey *k) +{ + unsigned i; + char buf[80]; + struct bucket *g; + + if (mutex_trylock(&b->c->bucket_lock)) { + for (i = 0; i < KEY_PTRS(k); i++) + if (ptr_available(b->c, k, i)) { + g = PTR_BUCKET(b->c, k, i); + + if (KEY_DIRTY(k) || + g->prio != BTREE_PRIO || + (b->c->gc_mark_valid && + GC_MARK(g) != GC_MARK_METADATA)) + goto err; + } + + mutex_unlock(&b->c->bucket_lock); + } + + return false; +err: + mutex_unlock(&b->c->bucket_lock); + bch_bkey_to_text(buf, sizeof(buf), k); + btree_bug(b, +"inconsistent btree pointer %s: bucket %li pin %i prio %i gen %i last_gc %i mark %llu gc_gen %i", + buf, PTR_BUCKET_NR(b->c, k, i), atomic_read(&g->pin), + g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen); + return true; +} + +static bool bch_btree_ptr_bad(struct btree *b, const struct bkey *k) +{ + unsigned i; + + if (!bkey_cmp(k, &ZERO_KEY) || + !KEY_PTRS(k) || + bch_ptr_invalid(b, k)) + return true; + + for (i = 0; i < KEY_PTRS(k); i++) + if (!ptr_available(b->c, k, i) || + ptr_stale(b->c, k, i)) + return true; + + if (expensive_debug_checks(b->c) && + btree_ptr_bad_expensive(b, k)) + return true; + + return false; +} + +const struct btree_keys_ops bch_btree_keys_ops = { + .sort_cmp = bch_key_sort_cmp, + .key_invalid = bch_btree_ptr_invalid, + .key_bad = bch_btree_ptr_bad, +}; + +/* Extents */ + +/* + * Returns true if l > r - unless l == r, in which case returns true if l is + * older than r. + * + * Necessary for btree_sort_fixup() - if there are multiple keys that compare + * equal in different sets, we have to process them newest to oldest. + */ +static bool bch_extent_sort_cmp(struct btree_iter_set l, + struct btree_iter_set r) +{ + int64_t c = bkey_cmp(&START_KEY(l.k), &START_KEY(r.k)); + + return c ? c > 0 : l.k < r.k; +} + +static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter, + struct bkey *tmp) +{ + while (iter->used > 1) { + struct btree_iter_set *top = iter->data, *i = top + 1; + + if (iter->used > 2 && + bch_extent_sort_cmp(i[0], i[1])) + i++; + + if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) + break; + + if (!KEY_SIZE(i->k)) { + sort_key_next(iter, i); + heap_sift(iter, i - top, bch_extent_sort_cmp); + continue; + } + + if (top->k > i->k) { + if (bkey_cmp(top->k, i->k) >= 0) + sort_key_next(iter, i); + else + bch_cut_front(top->k, i->k); + + heap_sift(iter, i - top, bch_extent_sort_cmp); + } else { + /* can't happen because of comparison func */ + BUG_ON(!bkey_cmp(&START_KEY(top->k), &START_KEY(i->k))); + + if (bkey_cmp(i->k, top->k) < 0) { + bkey_copy(tmp, top->k); + + bch_cut_back(&START_KEY(i->k), tmp); + bch_cut_front(i->k, top->k); + heap_sift(iter, 0, bch_extent_sort_cmp); + + return tmp; + } else { + bch_cut_back(&START_KEY(i->k), top->k); + } + } + } + + return NULL; +} + +static bool bch_extent_invalid(struct btree *b, const struct bkey *k) +{ + char buf[80]; + + if (!KEY_SIZE(k)) + return true; + + if (KEY_SIZE(k) > KEY_OFFSET(k)) + goto bad; + + if (__ptr_invalid(b->c, k)) + goto bad; + + return false; +bad: + bch_bkey_to_text(buf, sizeof(buf), k); + cache_bug(b->c, "spotted extent %s: %s", buf, bch_ptr_status(b->c, k)); + return true; +} + +static bool bch_extent_bad_expensive(struct btree *b, const struct bkey *k, + unsigned ptr) +{ + struct bucket *g = PTR_BUCKET(b->c, k, ptr); + char buf[80]; + + if (mutex_trylock(&b->c->bucket_lock)) { + if (b->c->gc_mark_valid && + ((GC_MARK(g) != GC_MARK_DIRTY && + KEY_DIRTY(k)) || + GC_MARK(g) == GC_MARK_METADATA)) + goto err; + + if (g->prio == BTREE_PRIO) + goto err; + + mutex_unlock(&b->c->bucket_lock); + } + + return false; +err: + mutex_unlock(&b->c->bucket_lock); + bch_bkey_to_text(buf, sizeof(buf), k); + btree_bug(b, +"inconsistent extent pointer %s:\nbucket %zu pin %i prio %i gen %i last_gc %i mark %llu gc_gen %i", + buf, PTR_BUCKET_NR(b->c, k, ptr), atomic_read(&g->pin), + g->prio, g->gen, g->last_gc, GC_MARK(g), g->gc_gen); + return true; +} + +static bool bch_extent_bad(struct btree *b, const struct bkey *k) +{ + struct bucket *g; + unsigned i, stale; + + if (!KEY_PTRS(k) || + bch_extent_invalid(b, k)) + return true; + + for (i = 0; i < KEY_PTRS(k); i++) + if (!ptr_available(b->c, k, i)) + return true; + + if (!expensive_debug_checks(b->c) && KEY_DIRTY(k)) + return false; + + for (i = 0; i < KEY_PTRS(k); i++) { + g = PTR_BUCKET(b->c, k, i); + stale = ptr_stale(b->c, k, i); + + btree_bug_on(stale > 96, b, + "key too stale: %i, need_gc %u", + stale, b->c->need_gc); + + btree_bug_on(stale && KEY_DIRTY(k) && KEY_SIZE(k), + b, "stale dirty pointer"); + + if (stale) + return true; + + if (expensive_debug_checks(b->c) && + bch_extent_bad_expensive(b, k, i)) + return true; + } + + return false; +} + +static uint64_t merge_chksums(struct bkey *l, struct bkey *r) +{ + return (l->ptr[KEY_PTRS(l)] + r->ptr[KEY_PTRS(r)]) & + ~((uint64_t)1 << 63); +} + +static bool bch_extent_merge(struct btree *b, struct bkey *l, struct bkey *r) +{ + unsigned i; + + if (key_merging_disabled(b->c)) + return false; + + if (KEY_PTRS(l) != KEY_PTRS(r) || + KEY_DIRTY(l) != KEY_DIRTY(r) || + bkey_cmp(l, &START_KEY(r))) + return false; + + for (i = 0; i < KEY_PTRS(l); i++) + if (l->ptr[i] + PTR(0, KEY_SIZE(l), 0) != r->ptr[i] || + PTR_BUCKET_NR(b->c, l, i) != PTR_BUCKET_NR(b->c, r, i)) + return false; + + /* Keys with no pointers aren't restricted to one bucket and could + * overflow KEY_SIZE + */ + if (KEY_SIZE(l) + KEY_SIZE(r) > USHRT_MAX) { + SET_KEY_OFFSET(l, KEY_OFFSET(l) + USHRT_MAX - KEY_SIZE(l)); + SET_KEY_SIZE(l, USHRT_MAX); + + bch_cut_front(l, r); + return false; + } + + if (KEY_CSUM(l)) { + if (KEY_CSUM(r)) + l->ptr[KEY_PTRS(l)] = merge_chksums(l, r); + else + SET_KEY_CSUM(l, 0); + } + + SET_KEY_OFFSET(l, KEY_OFFSET(l) + KEY_SIZE(r)); + SET_KEY_SIZE(l, KEY_SIZE(l) + KEY_SIZE(r)); + + return true; +} + +const struct btree_keys_ops bch_extent_keys_ops = { + .sort_cmp = bch_extent_sort_cmp, + .sort_fixup = bch_extent_sort_fixup, + .key_invalid = bch_extent_invalid, + .key_bad = bch_extent_bad, + .key_merge = bch_extent_merge, + .is_extents = true, +}; diff --git a/drivers/md/bcache/extents.h b/drivers/md/bcache/extents.h new file mode 100644 index 0000000..e0c0b68 --- /dev/null +++ b/drivers/md/bcache/extents.h @@ -0,0 +1,12 @@ +#ifndef _BCACHE_EXTENTS_H +#define _BCACHE_EXTENTS_H + +extern const struct btree_keys_ops bch_btree_keys_ops; +extern const struct btree_keys_ops bch_extent_keys_ops; + +struct bkey; +struct cache_set; + +bool __bch_btree_ptr_invalid(struct cache_set *, const struct bkey *); + +#endif /* _BCACHE_EXTENTS_H */ diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 12057a4..6d6a7a1 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -9,6 +9,7 @@ #include "bcache.h" #include "btree.h" #include "debug.h" +#include "extents.h" #include "request.h" #include "writeback.h" @@ -399,7 +400,7 @@ static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl) { struct bkey *k = &j->uuid_bucket; - if (bch_btree_ptr_invalid(c, k)) + if (__bch_btree_ptr_invalid(c, k)) return "bad uuid pointer"; bkey_copy(&c->uuid_bucket, k); @@ -1575,7 +1576,7 @@ static void run_cache_set(struct cache_set *c) k = &j->btree_root; err = "bad btree root"; - if (bch_btree_ptr_invalid(c, k)) + if (__bch_btree_ptr_invalid(c, k)) goto err; err = "error reading btree root"; |
