From 911c9610099f26e9e6ea3d1962ce24f53890b163 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@daterainc.com>
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 <kmo@daterainc.com>
---
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)
--
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