2 * Assorted bcache debug code
4 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
5 * Copyright 2012 Google, Inc.
13 #include <linux/console.h>
14 #include <linux/debugfs.h>
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/seq_file.h>
19 static struct dentry *debug;
21 #ifdef CONFIG_BCACHE_DEBUG
23 #define for_each_written_bset(b, start, i) \
25 (void *) i < (void *) (start) + (KEY_SIZE(&b->key) << 9) &&\
26 i->seq == (start)->seq; \
27 i = (void *) i + set_blocks(i, block_bytes(b->c)) * \
30 void bch_btree_verify(struct btree *b)
32 struct btree *v = b->c->verify_data;
33 struct bset *ondisk, *sorted, *inmemory;
36 if (!b->c->verify || !b->c->verify_ondisk)
40 mutex_lock(&b->c->verify_lock);
42 ondisk = b->c->verify_ondisk;
43 sorted = b->c->verify_data->keys.set->data;
44 inmemory = b->keys.set->data;
46 bkey_copy(&v->key, &b->key);
49 v->keys.ops = b->keys.ops;
51 bio = bch_bbio_alloc(b->c);
52 bio->bi_bdev = PTR_CACHE(b->c, &b->key, 0)->bdev;
53 bio->bi_iter.bi_sector = PTR_OFFSET(&b->key, 0);
54 bio->bi_iter.bi_size = KEY_SIZE(&v->key) << 9;
55 bch_bio_map(bio, sorted);
57 submit_bio_wait(REQ_META|READ_SYNC, bio);
58 bch_bbio_free(bio, b->c);
60 memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9);
62 bch_btree_node_read_done(v);
63 sorted = v->keys.set->data;
65 if (inmemory->keys != sorted->keys ||
66 memcmp(inmemory->start,
68 (void *) bset_bkey_last(inmemory) - (void *) inmemory->start)) {
74 printk(KERN_ERR "*** in memory:\n");
75 bch_dump_bset(&b->keys, inmemory, 0);
77 printk(KERN_ERR "*** read back in:\n");
78 bch_dump_bset(&v->keys, sorted, 0);
80 for_each_written_bset(b, ondisk, i) {
81 unsigned block = ((void *) i - (void *) ondisk) /
84 printk(KERN_ERR "*** on disk block %u:\n", block);
85 bch_dump_bset(&b->keys, i, block);
88 printk(KERN_ERR "*** block %zu not written\n",
89 ((void *) i - (void *) ondisk) / block_bytes(b->c));
91 for (j = 0; j < inmemory->keys; j++)
92 if (inmemory->d[j] != sorted->d[j])
95 printk(KERN_ERR "b->written %u\n", b->written);
98 panic("verify failed at %u\n", j);
101 mutex_unlock(&b->c->verify_lock);
105 void bch_data_verify(struct cached_dev *dc, struct bio *bio)
107 char name[BDEVNAME_SIZE];
109 struct bio_vec bv, *bv2;
110 struct bvec_iter iter;
113 check = bio_clone(bio, GFP_NOIO);
117 if (bio_alloc_pages(check, GFP_NOIO))
120 submit_bio_wait(READ_SYNC, check);
122 bio_for_each_segment(bv, bio, iter) {
123 void *p1 = kmap_atomic(bv.bv_page);
124 void *p2 = page_address(check->bi_io_vec[iter.bi_idx].bv_page);
126 cache_set_err_on(memcmp(p1 + bv.bv_offset,
130 "verify failed at dev %s sector %llu",
131 bdevname(dc->bdev, name),
132 (uint64_t) bio->bi_iter.bi_sector);
137 bio_for_each_segment_all(bv2, check, i)
138 __free_page(bv2->bv_page);
145 #ifdef CONFIG_DEBUG_FS
147 /* XXX: cache set refcounting */
149 struct dump_iterator {
156 static bool dump_pred(struct keybuf *buf, struct bkey *k)
161 static ssize_t bch_dump_read(struct file *file, char __user *buf,
162 size_t size, loff_t *ppos)
164 struct dump_iterator *i = file->private_data;
169 struct keybuf_key *w;
170 unsigned bytes = min(i->bytes, size);
172 int err = copy_to_user(buf, i->buf, bytes);
180 memmove(i->buf, i->buf + bytes, i->bytes);
185 w = bch_keybuf_next_rescan(i->c, &i->keys, &MAX_KEY, dump_pred);
189 bch_extent_to_text(kbuf, sizeof(kbuf), &w->key);
190 i->bytes = snprintf(i->buf, PAGE_SIZE, "%s\n", kbuf);
191 bch_keybuf_del(&i->keys, w);
197 static int bch_dump_open(struct inode *inode, struct file *file)
199 struct cache_set *c = inode->i_private;
200 struct dump_iterator *i;
202 i = kzalloc(sizeof(struct dump_iterator), GFP_KERNEL);
206 file->private_data = i;
208 bch_keybuf_init(&i->keys);
209 i->keys.last_scanned = KEY(0, 0, 0);
214 static int bch_dump_release(struct inode *inode, struct file *file)
216 kfree(file->private_data);
220 static const struct file_operations cache_set_debug_ops = {
221 .owner = THIS_MODULE,
222 .open = bch_dump_open,
223 .read = bch_dump_read,
224 .release = bch_dump_release
227 void bch_debug_init_cache_set(struct cache_set *c)
229 if (!IS_ERR_OR_NULL(debug)) {
231 snprintf(name, 50, "bcache-%pU", c->sb.set_uuid);
233 c->debug = debugfs_create_file(name, 0400, debug, c,
234 &cache_set_debug_ops);
240 void bch_debug_exit(void)
242 if (!IS_ERR_OR_NULL(debug))
243 debugfs_remove_recursive(debug);
246 int __init bch_debug_init(struct kobject *kobj)
250 debug = debugfs_create_dir("bcache", NULL);