xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bcache: Abstract out stuff needed for sorting

Browse Source 
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-12-20 17:22:05 -08:00
parent ee811287c9
commit 65d45231b5
9 changed files with 423 additions and 289 deletions
Download Patch File Download Diff File Expand all files Collapse all files

279
drivers/md/bcache/bset.c
View File

@@ -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)