![Kent Overstreet](/assets/img/avatar_default.png)
More work to disentangle various code from struct btree Signed-off-by: Kent Overstreet <kmo@daterainc.com>
253 lines
5.2 KiB
C
253 lines
5.2 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 "extents.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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#ifdef CONFIG_BCACHE_DEBUG
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#define for_each_written_bset(b, start, i) \
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for (i = (start); \
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(void *) i < (void *) (start) + (KEY_SIZE(&b->key) << 9) &&\
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i->seq == (start)->seq; \
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i = (void *) i + set_blocks(i, block_bytes(b->c)) * \
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block_bytes(b->c))
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void bch_btree_verify(struct btree *b)
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{
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struct btree *v = b->c->verify_data;
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struct bset *ondisk, *sorted, *inmemory;
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struct bio *bio;
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if (!b->c->verify || !b->c->verify_ondisk)
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return;
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down(&b->io_mutex);
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mutex_lock(&b->c->verify_lock);
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ondisk = b->c->verify_ondisk;
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sorted = b->c->verify_data->keys.set->data;
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inmemory = b->keys.set->data;
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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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v->keys.ops = b->keys.ops;
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bio = bch_bbio_alloc(b->c);
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bio->bi_bdev = PTR_CACHE(b->c, &b->key, 0)->bdev;
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bio->bi_iter.bi_sector = PTR_OFFSET(&b->key, 0);
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bio->bi_iter.bi_size = KEY_SIZE(&v->key) << 9;
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bch_bio_map(bio, sorted);
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submit_bio_wait(REQ_META|READ_SYNC, bio);
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bch_bbio_free(bio, b->c);
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memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9);
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bch_btree_node_read_done(v);
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sorted = v->keys.set->data;
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if (inmemory->keys != sorted->keys ||
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memcmp(inmemory->start,
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sorted->start,
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(void *) bset_bkey_last(inmemory) - (void *) inmemory->start)) {
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struct bset *i;
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unsigned j;
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console_lock();
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printk(KERN_ERR "*** in memory:\n");
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bch_dump_bset(&b->keys, inmemory, 0);
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printk(KERN_ERR "*** read back in:\n");
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bch_dump_bset(&v->keys, sorted, 0);
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for_each_written_bset(b, ondisk, i) {
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unsigned block = ((void *) i - (void *) ondisk) /
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block_bytes(b->c);
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printk(KERN_ERR "*** on disk block %u:\n", block);
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bch_dump_bset(&b->keys, i, block);
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}
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printk(KERN_ERR "*** block %zu not written\n",
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((void *) i - (void *) ondisk) / block_bytes(b->c));
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for (j = 0; j < inmemory->keys; j++)
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if (inmemory->d[j] != sorted->d[j])
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break;
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printk(KERN_ERR "b->written %u\n", b->written);
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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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up(&b->io_mutex);
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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, *bv2;
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struct bvec_iter iter;
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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, iter) {
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void *p1 = kmap_atomic(bv.bv_page);
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void *p2 = page_address(check->bi_io_vec[iter.bi_idx].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_iter.bi_sector);
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kunmap_atomic(p1);
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}
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bio_for_each_segment_all(bv2, check, i)
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__free_page(bv2->bv_page);
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out_put:
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bio_put(check);
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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_extent_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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