![Kent Overstreet](/assets/img/avatar_default.png)
More testing ftw! Also, now verify mode doesn't break if you read dirty data. Signed-off-by: Kent Overstreet <kmo@daterainc.com>
387 lines
7.6 KiB
C
387 lines
7.6 KiB
C
/*
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* Assorted bcache debug code
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*
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* Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
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* Copyright 2012 Google, Inc.
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*/
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#include "bcache.h"
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#include "btree.h"
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#include "debug.h"
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#include <linux/console.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/seq_file.h>
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static struct dentry *debug;
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const char *bch_ptr_status(struct cache_set *c, const struct bkey *k)
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{
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unsigned i;
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for (i = 0; i < KEY_PTRS(k); i++)
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if (ptr_available(c, k, i)) {
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struct cache *ca = PTR_CACHE(c, k, i);
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size_t bucket = PTR_BUCKET_NR(c, k, i);
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size_t r = bucket_remainder(c, PTR_OFFSET(k, i));
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if (KEY_SIZE(k) + r > c->sb.bucket_size)
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return "bad, length too big";
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if (bucket < ca->sb.first_bucket)
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return "bad, short offset";
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if (bucket >= ca->sb.nbuckets)
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return "bad, offset past end of device";
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if (ptr_stale(c, k, i))
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return "stale";
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}
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if (!bkey_cmp(k, &ZERO_KEY))
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return "bad, null key";
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if (!KEY_PTRS(k))
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return "bad, no pointers";
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if (!KEY_SIZE(k))
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return "zeroed key";
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return "";
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}
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int bch_bkey_to_text(char *buf, size_t size, const struct bkey *k)
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{
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unsigned i = 0;
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char *out = buf, *end = buf + size;
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#define p(...) (out += scnprintf(out, end - out, __VA_ARGS__))
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p("%llu:%llu len %llu -> [", KEY_INODE(k), KEY_OFFSET(k), KEY_SIZE(k));
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if (KEY_PTRS(k))
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while (1) {
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p("%llu:%llu gen %llu",
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PTR_DEV(k, i), PTR_OFFSET(k, i), PTR_GEN(k, i));
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if (++i == KEY_PTRS(k))
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break;
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p(", ");
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}
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p("]");
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if (KEY_DIRTY(k))
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p(" dirty");
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if (KEY_CSUM(k))
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p(" cs%llu %llx", KEY_CSUM(k), k->ptr[1]);
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#undef p
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return out - buf;
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}
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#ifdef CONFIG_BCACHE_DEBUG
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static void dump_bset(struct btree *b, struct bset *i)
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{
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struct bkey *k, *next;
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unsigned j;
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char buf[80];
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for (k = i->start; k < end(i); k = next) {
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next = bkey_next(k);
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bch_bkey_to_text(buf, sizeof(buf), k);
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printk(KERN_ERR "block %zu key %zi/%u: %s", index(i, b),
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(uint64_t *) k - i->d, i->keys, buf);
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for (j = 0; j < KEY_PTRS(k); j++) {
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size_t n = PTR_BUCKET_NR(b->c, k, j);
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printk(" bucket %zu", n);
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if (n >= b->c->sb.first_bucket && n < b->c->sb.nbuckets)
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printk(" prio %i",
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PTR_BUCKET(b->c, k, j)->prio);
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}
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printk(" %s\n", bch_ptr_status(b->c, k));
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if (next < end(i) &&
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bkey_cmp(k, !b->level ? &START_KEY(next) : next) > 0)
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printk(KERN_ERR "Key skipped backwards\n");
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}
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}
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static void bch_dump_bucket(struct btree *b)
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{
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unsigned i;
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console_lock();
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for (i = 0; i <= b->nsets; i++)
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dump_bset(b, b->sets[i].data);
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console_unlock();
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}
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void bch_btree_verify(struct btree *b, struct bset *new)
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{
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struct btree *v = b->c->verify_data;
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struct closure cl;
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closure_init_stack(&cl);
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if (!b->c->verify)
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return;
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closure_wait_event(&b->io.wait, &cl,
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atomic_read(&b->io.cl.remaining) == -1);
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mutex_lock(&b->c->verify_lock);
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bkey_copy(&v->key, &b->key);
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v->written = 0;
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v->level = b->level;
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bch_btree_node_read(v);
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closure_wait_event(&v->io.wait, &cl,
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atomic_read(&b->io.cl.remaining) == -1);
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if (new->keys != v->sets[0].data->keys ||
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memcmp(new->start,
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v->sets[0].data->start,
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(void *) end(new) - (void *) new->start)) {
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unsigned i, j;
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console_lock();
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printk(KERN_ERR "*** original memory node:\n");
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for (i = 0; i <= b->nsets; i++)
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dump_bset(b, b->sets[i].data);
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printk(KERN_ERR "*** sorted memory node:\n");
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dump_bset(b, new);
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printk(KERN_ERR "*** on disk node:\n");
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dump_bset(v, v->sets[0].data);
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for (j = 0; j < new->keys; j++)
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if (new->d[j] != v->sets[0].data->d[j])
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break;
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console_unlock();
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panic("verify failed at %u\n", j);
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}
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mutex_unlock(&b->c->verify_lock);
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}
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void bch_data_verify(struct cached_dev *dc, struct bio *bio)
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{
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char name[BDEVNAME_SIZE];
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struct bio *check;
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struct bio_vec *bv;
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int i;
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check = bio_clone(bio, GFP_NOIO);
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if (!check)
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return;
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if (bio_alloc_pages(check, GFP_NOIO))
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goto out_put;
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submit_bio_wait(READ_SYNC, check);
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bio_for_each_segment(bv, bio, i) {
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void *p1 = kmap_atomic(bv->bv_page);
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void *p2 = page_address(check->bi_io_vec[i].bv_page);
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cache_set_err_on(memcmp(p1 + bv->bv_offset,
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p2 + bv->bv_offset,
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bv->bv_len),
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dc->disk.c,
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"verify failed at dev %s sector %llu",
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bdevname(dc->bdev, name),
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(uint64_t) bio->bi_sector);
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kunmap_atomic(p1);
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}
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bio_for_each_segment_all(bv, check, i)
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__free_page(bv->bv_page);
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out_put:
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bio_put(check);
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}
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int __bch_count_data(struct btree *b)
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{
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unsigned ret = 0;
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struct btree_iter iter;
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struct bkey *k;
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if (!b->level)
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for_each_key(b, k, &iter)
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ret += KEY_SIZE(k);
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return ret;
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}
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void __bch_check_keys(struct btree *b, const char *fmt, ...)
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{
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va_list args;
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struct bkey *k, *p = NULL;
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struct btree_iter iter;
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const char *err;
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for_each_key(b, k, &iter) {
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if (!b->level) {
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err = "Keys out of order";
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if (p && bkey_cmp(&START_KEY(p), &START_KEY(k)) > 0)
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goto bug;
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if (bch_ptr_invalid(b, k))
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continue;
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err = "Overlapping keys";
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if (p && bkey_cmp(p, &START_KEY(k)) > 0)
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goto bug;
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} else {
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if (bch_ptr_bad(b, k))
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continue;
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err = "Duplicate keys";
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if (p && !bkey_cmp(p, k))
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goto bug;
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}
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p = k;
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}
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err = "Key larger than btree node key";
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if (p && bkey_cmp(p, &b->key) > 0)
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goto bug;
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return;
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bug:
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bch_dump_bucket(b);
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va_start(args, fmt);
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vprintk(fmt, args);
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va_end(args);
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panic("bcache error: %s:\n", err);
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}
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void bch_btree_iter_next_check(struct btree_iter *iter)
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{
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struct bkey *k = iter->data->k, *next = bkey_next(k);
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if (next < iter->data->end &&
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bkey_cmp(k, iter->b->level ? next : &START_KEY(next)) > 0) {
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bch_dump_bucket(iter->b);
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panic("Key skipped backwards\n");
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}
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}
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#endif
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#ifdef CONFIG_DEBUG_FS
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/* XXX: cache set refcounting */
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struct dump_iterator {
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char buf[PAGE_SIZE];
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size_t bytes;
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struct cache_set *c;
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struct keybuf keys;
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};
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static bool dump_pred(struct keybuf *buf, struct bkey *k)
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{
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return true;
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}
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static ssize_t bch_dump_read(struct file *file, char __user *buf,
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size_t size, loff_t *ppos)
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{
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struct dump_iterator *i = file->private_data;
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ssize_t ret = 0;
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char kbuf[80];
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while (size) {
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struct keybuf_key *w;
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unsigned bytes = min(i->bytes, size);
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int err = copy_to_user(buf, i->buf, bytes);
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if (err)
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return err;
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ret += bytes;
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buf += bytes;
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size -= bytes;
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i->bytes -= bytes;
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memmove(i->buf, i->buf + bytes, i->bytes);
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if (i->bytes)
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break;
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w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY, dump_pred);
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if (!w)
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break;
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bch_bkey_to_text(kbuf, sizeof(kbuf), &w->key);
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i->bytes = snprintf(i->buf, PAGE_SIZE, "%s\n", kbuf);
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bch_keybuf_del(&i->keys, w);
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}
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return ret;
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}
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static int bch_dump_open(struct inode *inode, struct file *file)
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{
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struct cache_set *c = inode->i_private;
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struct dump_iterator *i;
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i = kzalloc(sizeof(struct dump_iterator), GFP_KERNEL);
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if (!i)
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return -ENOMEM;
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file->private_data = i;
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i->c = c;
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bch_keybuf_init(&i->keys);
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i->keys.last_scanned = KEY(0, 0, 0);
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return 0;
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}
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static int bch_dump_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static const struct file_operations cache_set_debug_ops = {
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.owner = THIS_MODULE,
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.open = bch_dump_open,
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.read = bch_dump_read,
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.release = bch_dump_release
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};
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void bch_debug_init_cache_set(struct cache_set *c)
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{
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if (!IS_ERR_OR_NULL(debug)) {
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char name[50];
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snprintf(name, 50, "bcache-%pU", c->sb.set_uuid);
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c->debug = debugfs_create_file(name, 0400, debug, c,
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&cache_set_debug_ops);
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}
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}
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#endif
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void bch_debug_exit(void)
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{
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if (!IS_ERR_OR_NULL(debug))
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debugfs_remove_recursive(debug);
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}
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int __init bch_debug_init(struct kobject *kobj)
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{
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int ret = 0;
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debug = debugfs_create_dir("bcache", NULL);
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return ret;
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}
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