diff options
Diffstat (limited to 'drivers/md/bcache/debug.c')
| -rw-r--r-- | drivers/md/bcache/debug.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c new file mode 100644 index 000000000..f6b60d590 --- /dev/null +++ b/drivers/md/bcache/debug.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Assorted bcache debug code + * + * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> + * Copyright 2012 Google, Inc. + */ + +#include "bcache.h" +#include "btree.h" +#include "debug.h" +#include "extents.h" + +#include <linux/console.h> +#include <linux/debugfs.h> +#include <linux/module.h> +#include <linux/random.h> +#include <linux/seq_file.h> + +struct dentry *bcache_debug; + +#ifdef CONFIG_BCACHE_DEBUG + +#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, block_bytes(b->c)) * \ + block_bytes(b->c)) + +void bch_btree_verify(struct btree *b) +{ + struct btree *v = b->c->verify_data; + struct bset *ondisk, *sorted, *inmemory; + struct bio *bio; + + 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->keys.set->data; + inmemory = b->keys.set->data; + + bkey_copy(&v->key, &b->key); + v->written = 0; + v->level = b->level; + v->keys.ops = b->keys.ops; + + bio = bch_bbio_alloc(b->c); + bio_set_dev(bio, 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; + bio->bi_opf = REQ_OP_READ | REQ_META; + bch_bio_map(bio, sorted); + + submit_bio_wait(bio); + bch_bbio_free(bio, b->c); + + memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9); + + bch_btree_node_read_done(v); + sorted = v->keys.set->data; + + if (inmemory->keys != sorted->keys || + memcmp(inmemory->start, + sorted->start, + (void *) bset_bkey_last(inmemory) - + (void *) inmemory->start)) { + struct bset *i; + unsigned int j; + + console_lock(); + + pr_err("*** in memory:\n"); + bch_dump_bset(&b->keys, inmemory, 0); + + pr_err("*** read back in:\n"); + bch_dump_bset(&v->keys, sorted, 0); + + for_each_written_bset(b, ondisk, i) { + unsigned int block = ((void *) i - (void *) ondisk) / + block_bytes(b->c); + + pr_err("*** on disk block %u:\n", block); + bch_dump_bset(&b->keys, i, block); + } + + pr_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; + + pr_err("b->written %u\n", b->written); + + console_unlock(); + panic("verify failed at %u\n", j); + } + + mutex_unlock(&b->c->verify_lock); + up(&b->io_mutex); +} + +void bch_data_verify(struct cached_dev *dc, struct bio *bio) +{ + struct bio *check; + struct bio_vec bv, cbv; + struct bvec_iter iter, citer = { 0 }; + + check = bio_kmalloc(GFP_NOIO, bio_segments(bio)); + if (!check) + return; + check->bi_disk = bio->bi_disk; + check->bi_opf = REQ_OP_READ; + check->bi_iter.bi_sector = bio->bi_iter.bi_sector; + check->bi_iter.bi_size = bio->bi_iter.bi_size; + + bch_bio_map(check, NULL); + if (bch_bio_alloc_pages(check, GFP_NOIO)) + goto out_put; + + submit_bio_wait(check); + + citer.bi_size = UINT_MAX; + bio_for_each_segment(bv, bio, iter) { + void *p1 = kmap_atomic(bv.bv_page); + void *p2; + + cbv = bio_iter_iovec(check, citer); + p2 = page_address(cbv.bv_page); + + cache_set_err_on(memcmp(p1 + bv.bv_offset, + p2 + bv.bv_offset, + bv.bv_len), + dc->disk.c, + "verify failed at dev %s sector %llu", + dc->backing_dev_name, + (uint64_t) bio->bi_iter.bi_sector); + + kunmap_atomic(p1); + bio_advance_iter(check, &citer, bv.bv_len); + } + + bio_free_pages(check); +out_put: + bio_put(check); +} + +#endif + +#ifdef CONFIG_DEBUG_FS + +/* XXX: cache set refcounting */ + +struct dump_iterator { + char buf[PAGE_SIZE]; + size_t bytes; + struct cache_set *c; + struct keybuf keys; +}; + +static bool dump_pred(struct keybuf *buf, struct bkey *k) +{ + return true; +} + +static ssize_t bch_dump_read(struct file *file, char __user *buf, + size_t size, loff_t *ppos) +{ + struct dump_iterator *i = file->private_data; + ssize_t ret = 0; + char kbuf[80]; + + while (size) { + struct keybuf_key *w; + unsigned int bytes = min(i->bytes, size); + + if (copy_to_user(buf, i->buf, bytes)) + return -EFAULT; + + ret += bytes; + buf += bytes; + size -= bytes; + i->bytes -= bytes; + memmove(i->buf, i->buf + bytes, i->bytes); + + if (i->bytes) + break; + + w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY, dump_pred); + if (!w) + break; + + bch_extent_to_text(kbuf, sizeof(kbuf), &w->key); + i->bytes = snprintf(i->buf, PAGE_SIZE, "%s\n", kbuf); + bch_keybuf_del(&i->keys, w); + } + + return ret; +} + +static int bch_dump_open(struct inode *inode, struct file *file) +{ + struct cache_set *c = inode->i_private; + struct dump_iterator *i; + + i = kzalloc(sizeof(struct dump_iterator), GFP_KERNEL); + if (!i) + return -ENOMEM; + + file->private_data = i; + i->c = c; + bch_keybuf_init(&i->keys); + i->keys.last_scanned = KEY(0, 0, 0); + + return 0; +} + +static int bch_dump_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static const struct file_operations cache_set_debug_ops = { + .owner = THIS_MODULE, + .open = bch_dump_open, + .read = bch_dump_read, + .release = bch_dump_release +}; + +void bch_debug_init_cache_set(struct cache_set *c) +{ + if (!IS_ERR_OR_NULL(bcache_debug)) { + char name[50]; + + snprintf(name, 50, "bcache-%pU", c->sb.set_uuid); + c->debug = debugfs_create_file(name, 0400, bcache_debug, c, + &cache_set_debug_ops); + } +} + +#endif + +void bch_debug_exit(void) +{ + debugfs_remove_recursive(bcache_debug); +} + +void __init bch_debug_init(struct kobject *kobj) +{ + /* + * it is unnecessary to check return value of + * debugfs_create_file(), we should not care + * about this. + */ + bcache_debug = debugfs_create_dir("bcache", NULL); +} |