Commit 911c9610 authored by Kent Overstreet's avatar Kent Overstreet
Browse files

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: default avatarKent Overstreet <kmo@daterainc.com>
parent fafff81c

drivers/md/bcache/bset.c

+63 −21
Original line number Diff line number Diff line
@@ -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;

drivers/md/bcache/bset.h

+2 −2
Original line number Diff line number Diff line
@@ -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

drivers/md/bcache/btree.c

+8 −2
Original line number Diff line number Diff line
@@ -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;

drivers/md/bcache/btree.h

+0 −7
Original line number Diff line number Diff line
@@ -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)

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