From 911c9610099f26e9e6ea3d1962ce24f53890b163 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Sun, 28 Jul 2013 18:35:09 -0700 Subject: bcache: Split out sort_extent_cmp() Only use extent comparison for comparing extents, so we're not using START_KEY() on other key types (i.e. btree pointers) Signed-off-by: Kent Overstreet --- drivers/md/bcache/bset.c | 84 +++++++++++++++++++++++++++++++++++------------ drivers/md/bcache/bset.h | 4 +-- drivers/md/bcache/btree.c | 10 ++++-- drivers/md/bcache/btree.h | 7 ---- 4 files changed, 73 insertions(+), 32 deletions(-) (limited to 'drivers/md/bcache') diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index bfee926e35f0..9e3a53d87de0 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -855,19 +855,13 @@ struct bkey *__bch_bset_search(struct btree *b, struct bset_tree *t, /* Btree iterator */ -/* - * 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. - */ +typedef bool (btree_iter_cmp_fn)(struct btree_iter_set, + struct btree_iter_set); + static inline bool btree_iter_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; + return bkey_cmp(l.k, r.k) > 0; } static inline bool btree_iter_end(struct btree_iter *iter) @@ -884,8 +878,10 @@ void bch_btree_iter_push(struct btree_iter *iter, struct bkey *k, btree_iter_cmp)); } -struct bkey *__bch_btree_iter_init(struct btree *b, struct btree_iter *iter, - struct bkey *search, struct bset_tree *start) +static struct bkey *__bch_btree_iter_init(struct btree *b, + struct btree_iter *iter, + struct bkey *search, + struct bset_tree *start) { struct bkey *ret = NULL; iter->size = ARRAY_SIZE(iter->data); @@ -903,7 +899,15 @@ struct bkey *__bch_btree_iter_init(struct btree *b, struct btree_iter *iter, return ret; } -struct bkey *bch_btree_iter_next(struct btree_iter *iter) +struct bkey *bch_btree_iter_init(struct btree *b, + struct btree_iter *iter, + struct bkey *search) +{ + return __bch_btree_iter_init(b, iter, search, b->sets); +} + +static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter, + btree_iter_cmp_fn *cmp) { struct btree_iter_set unused; struct bkey *ret = NULL; @@ -920,14 +924,20 @@ struct bkey *bch_btree_iter_next(struct btree_iter *iter) } if (iter->data->k == iter->data->end) - heap_pop(iter, unused, btree_iter_cmp); + heap_pop(iter, unused, cmp); else - heap_sift(iter, 0, btree_iter_cmp); + heap_sift(iter, 0, cmp); } return ret; } +struct bkey *bch_btree_iter_next(struct btree_iter *iter) +{ + return __bch_btree_iter_next(iter, btree_iter_cmp); + +} + struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter, struct btree *b, ptr_filter_fn fn) { @@ -951,13 +961,37 @@ static void sort_key_next(struct btree_iter *iter, *i = iter->data[--iter->used]; } -static struct bkey *btree_sort_fixup(struct btree_iter *iter, struct bkey *tmp) +/* + * 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 && - btree_iter_cmp(i[0], i[1])) + sort_extent_cmp(i[0], i[1])) i++; if (bkey_cmp(top->k, &START_KEY(i->k)) <= 0) @@ -965,7 +999,7 @@ static struct bkey *btree_sort_fixup(struct btree_iter *iter, struct bkey *tmp) if (!KEY_SIZE(i->k)) { sort_key_next(iter, i); - heap_sift(iter, i - top, btree_iter_cmp); + heap_sift(iter, i - top, sort_extent_cmp); continue; } @@ -975,7 +1009,7 @@ static struct bkey *btree_sort_fixup(struct btree_iter *iter, struct bkey *tmp) else bch_cut_front(top->k, i->k); - heap_sift(iter, i - top, btree_iter_cmp); + 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))); @@ -1001,20 +1035,28 @@ static void btree_mergesort(struct btree *b, struct bset *out, struct btree_iter *iter, bool fixup, bool remove_stale) { + 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); + while (!btree_iter_end(iter)) { if (fixup && !b->level) - k = btree_sort_fixup(iter, &tmp.k); + k = btree_sort_fixup_extents(iter, &tmp.k); else k = NULL; if (!k) - k = bch_btree_iter_next(iter); + k = __bch_btree_iter_next(iter, cmp); if (bad(b, k)) continue; diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index 88b6edbf508b..91bcbdb04085 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -305,8 +305,8 @@ struct bkey *bch_btree_iter_next_filter(struct btree_iter *, struct btree *, ptr_filter_fn); void bch_btree_iter_push(struct btree_iter *, struct bkey *, struct bkey *); -struct bkey *__bch_btree_iter_init(struct btree *, struct btree_iter *, - struct bkey *, struct bset_tree *); +struct bkey *bch_btree_iter_init(struct btree *, struct btree_iter *, + struct bkey *); /* 32 bits total: */ #define BKEY_MID_BITS 3 diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 8aaaf16637a0..e1e36e761724 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -1854,10 +1854,16 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert, while (1) { struct bkey *k = bch_btree_iter_next(iter); - if (!k || - bkey_cmp(&START_KEY(k), insert) >= 0) + if (!k) break; + if (bkey_cmp(&START_KEY(k), insert) >= 0) { + if (KEY_SIZE(k)) + break; + else + continue; + } + if (bkey_cmp(k, &START_KEY(insert)) <= 0) continue; diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h index 580b01137264..2a5a8481f25e 100644 --- a/drivers/md/bcache/btree.h +++ b/drivers/md/bcache/btree.h @@ -225,13 +225,6 @@ static inline void set_gc_sectors(struct cache_set *c) atomic_set(&c->sectors_to_gc, c->sb.bucket_size * c->nbuckets / 16); } -static inline struct bkey *bch_btree_iter_init(struct btree *b, - struct btree_iter *iter, - struct bkey *search) -{ - return __bch_btree_iter_init(b, iter, search, b->sets); -} - static inline bool bch_ptr_invalid(struct btree *b, const struct bkey *k) { if (b->level) -- cgit v1.2.1