Orange Pi5 kernel

// 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->cache)) *	\
<------><------> block_bytes(b->c->cache))
 
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->cache);
 
<------><------><------>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->cache));
 
<------><------>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->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(void)
{
<------>/*
<------> * it is unnecessary to check return value of
<------> * debugfs_create_file(), we should not care
<------> * about this.
<------> */
<------>bcache_debug = debugfs_create_dir("bcache", NULL);
}