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bcache: Btree verify code improvements

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Used this fixed code to find and fix the bug fixed by
a4d885097b0ac0cd1337f171f2d4b83e946094d4.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-12-17 22:49:08 -08:00
parent 88b9f8c426
commit 78b77bf8b2
6 changed files with 83 additions and 40 deletions
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97
drivers/md/bcache/debug.c
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@@ -53,18 +53,18 @@ int bch_bkey_to_text(char *buf, size_t size, const struct bkey *k)
#define p(...) (out += scnprintf(out, end - out, __VA_ARGS__))
p("%llu:%llu len %llu -> [", KEY_INODE(k), KEY_OFFSET(k), KEY_SIZE(k));
if (KEY_PTRS(k))
while (1) {
p("%llu:%llu gen %llu",
PTR_DEV(k, i), PTR_OFFSET(k, i), PTR_GEN(k, i));
if (++i == KEY_PTRS(k))
break;
p("%llu:%llu len %llu -> [", KEY_INODE(k), KEY_START(k), KEY_SIZE(k));
for (i = 0; i < KEY_PTRS(k); i++) {
if (i)
p(", ");
}
if (PTR_DEV(k, i) == PTR_CHECK_DEV)
p("check dev");
else
p("%llu:%llu gen %llu", PTR_DEV(k, i),
PTR_OFFSET(k, i), PTR_GEN(k, i));
}
p("]");
@@ -78,7 +78,7 @@ int bch_bkey_to_text(char *buf, size_t size, const struct bkey *k)
#ifdef CONFIG_BCACHE_DEBUG
static void dump_bset(struct btree *b, struct bset *i)
static void dump_bset(struct btree *b, struct bset *i, unsigned set)
{
struct bkey *k, *next;
unsigned j;
@@ -88,7 +88,7 @@ static void dump_bset(struct btree *b, struct bset *i)
next = bkey_next(k);
bch_bkey_to_text(buf, sizeof(buf), k);
printk(KERN_ERR "block %u key %zi/%u: %s", bset_block_offset(b, i),
printk(KERN_ERR "b %u k %zi/%u: %s", set,
(uint64_t *) k - i->d, i->keys, buf);
for (j = 0; j < KEY_PTRS(k); j++) {
@@ -114,50 +114,83 @@ static void bch_dump_bucket(struct btree *b)
console_lock();
for (i = 0; i <= b->nsets; i++)
dump_bset(b, b->sets[i].data);
dump_bset(b, b->sets[i].data,
bset_block_offset(b, b->sets[i].data));
console_unlock();
}
void bch_btree_verify(struct btree *b, struct bset *new)
#define for_each_written_bset(b, start, i) \
for (i = (start); \
(void *) i < (void *) (start) + (KEY_SIZE(&b->key) << 9) &&\
i->seq == (start)->seq; \
i = (void *) i + set_blocks(i, b->c) * block_bytes(b->c))
void bch_btree_verify(struct btree *b)
{
struct btree *v = b->c->verify_data;
struct closure cl;
closure_init_stack(&cl);
struct bset *ondisk, *sorted, *inmemory;
struct bio *bio;
if (!b->c->verify)
if (!b->c->verify || !b->c->verify_ondisk)
return;
down(&b->io_mutex);
mutex_lock(&b->c->verify_lock);
ondisk = b->c->verify_ondisk;
sorted = b->c->verify_data->sets->data;
inmemory = b->sets->data;
bkey_copy(&v->key, &b->key);
v->written = 0;
v->level = b->level;
bch_btree_node_read(v);
bio = bch_bbio_alloc(b->c);
bio->bi_bdev = PTR_CACHE(b->c, &b->key, 0)->bdev;
bio->bi_iter.bi_sector = PTR_OFFSET(&b->key, 0);
bio->bi_iter.bi_size = KEY_SIZE(&v->key) << 9;
bch_bio_map(bio, sorted);
if (new->keys != v->sets[0].data->keys ||
memcmp(new->start,
v->sets[0].data->start,
(void *) end(new) - (void *) new->start)) {
unsigned i, j;
submit_bio_wait(REQ_META|READ_SYNC, bio);
bch_bbio_free(bio, b->c);
memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9);
bch_btree_node_read_done(v);
sorted = v->sets->data;
if (inmemory->keys != sorted->keys ||
memcmp(inmemory->start,
sorted->start,
(void *) end(inmemory) - (void *) inmemory->start)) {
struct bset *i;
unsigned j;
console_lock();
printk(KERN_ERR "*** original memory node:\n");
for (i = 0; i <= b->nsets; i++)
dump_bset(b, b->sets[i].data);
printk(KERN_ERR "*** in memory:\n");
dump_bset(b, inmemory, 0);
printk(KERN_ERR "*** sorted memory node:\n");
dump_bset(b, new);
printk(KERN_ERR "*** read back in:\n");
dump_bset(v, sorted, 0);
printk(KERN_ERR "*** on disk node:\n");
dump_bset(v, v->sets[0].data);
for_each_written_bset(b, ondisk, i) {
unsigned block = ((void *) i - (void *) ondisk) /
block_bytes(b->c);
for (j = 0; j < new->keys; j++)
if (new->d[j] != v->sets[0].data->d[j])
printk(KERN_ERR "*** on disk block %u:\n", block);
dump_bset(b, i, block);
}
printk(KERN_ERR "*** block %zu not written\n",
((void *) i - (void *) ondisk) / block_bytes(b->c));
for (j = 0; j < inmemory->keys; j++)
if (inmemory->d[j] != sorted->d[j])
break;
printk(KERN_ERR "b->written %u\n", b->written);
console_unlock();
panic("verify failed at %u\n", j);
}