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-rw-r--r--fs/bcachefs/debug.c425
1 files changed, 425 insertions, 0 deletions
diff --git a/fs/bcachefs/debug.c b/fs/bcachefs/debug.c
new file mode 100644
index 000000000000..7db0e65927c6
--- /dev/null
+++ b/fs/bcachefs/debug.c
@@ -0,0 +1,425 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Assorted bcachefs debug code
+ *
+ * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
+ * Copyright 2012 Google, Inc.
+ */
+
+#include "bcachefs.h"
+#include "bkey_methods.h"
+#include "btree_cache.h"
+#include "btree_io.h"
+#include "btree_iter.h"
+#include "btree_update.h"
+#include "buckets.h"
+#include "debug.h"
+#include "error.h"
+#include "extents.h"
+#include "fsck.h"
+#include "inode.h"
+#include "io.h"
+#include "super.h"
+
+#include <linux/console.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+
+static struct dentry *bch_debug;
+
+#ifdef CONFIG_BCACHEFS_DEBUG
+
+void __bch2_btree_verify(struct bch_fs *c, struct btree *b)
+{
+ struct btree *v = c->verify_data;
+ struct btree_node *n_ondisk, *n_sorted, *n_inmemory;
+ struct bset *sorted, *inmemory;
+ struct extent_pick_ptr pick;
+ struct bch_dev *ca;
+ struct bio *bio;
+
+ if (c->opts.nochanges)
+ return;
+
+ btree_node_io_lock(b);
+ mutex_lock(&c->verify_lock);
+
+ n_ondisk = c->verify_ondisk;
+ n_sorted = c->verify_data->data;
+ n_inmemory = b->data;
+
+ bkey_copy(&v->key, &b->key);
+ v->written = 0;
+ v->level = b->level;
+ v->btree_id = b->btree_id;
+ bch2_btree_keys_init(v, &c->expensive_debug_checks);
+
+ if (bch2_btree_pick_ptr(c, b, NULL, &pick) <= 0)
+ return;
+
+ ca = bch_dev_bkey_exists(c, pick.ptr.dev);
+ if (!bch2_dev_get_ioref(ca, READ))
+ return;
+
+ bio = bio_alloc_bioset(ca->disk_sb.bdev,
+ buf_pages(n_sorted, btree_bytes(c)),
+ REQ_OP_READ|REQ_META,
+ GFP_NOIO,
+ &c->btree_bio);
+ bio->bi_iter.bi_sector = pick.ptr.offset;
+ bio->bi_iter.bi_size = btree_bytes(c);
+ bch2_bio_map(bio, n_sorted);
+
+ submit_bio_wait(bio);
+
+ bio_put(bio);
+ percpu_ref_put(&ca->io_ref);
+
+ memcpy(n_ondisk, n_sorted, btree_bytes(c));
+
+ if (bch2_btree_node_read_done(c, v, false))
+ goto out;
+
+ n_sorted = c->verify_data->data;
+ sorted = &n_sorted->keys;
+ inmemory = &n_inmemory->keys;
+
+ if (inmemory->u64s != sorted->u64s ||
+ memcmp(inmemory->start,
+ sorted->start,
+ vstruct_end(inmemory) - (void *) inmemory->start)) {
+ unsigned offset = 0, sectors;
+ struct bset *i;
+ unsigned j;
+
+ console_lock();
+
+ printk(KERN_ERR "*** in memory:\n");
+ bch2_dump_bset(b, inmemory, 0);
+
+ printk(KERN_ERR "*** read back in:\n");
+ bch2_dump_bset(v, sorted, 0);
+
+ while (offset < b->written) {
+ if (!offset ) {
+ i = &n_ondisk->keys;
+ sectors = vstruct_blocks(n_ondisk, c->block_bits) <<
+ c->block_bits;
+ } else {
+ struct btree_node_entry *bne =
+ (void *) n_ondisk + (offset << 9);
+ i = &bne->keys;
+
+ sectors = vstruct_blocks(bne, c->block_bits) <<
+ c->block_bits;
+ }
+
+ printk(KERN_ERR "*** on disk block %u:\n", offset);
+ bch2_dump_bset(b, i, offset);
+
+ offset += sectors;
+ }
+
+ printk(KERN_ERR "*** block %u/%u not written\n",
+ offset >> c->block_bits, btree_blocks(c));
+
+ for (j = 0; j < le16_to_cpu(inmemory->u64s); j++)
+ if (inmemory->_data[j] != sorted->_data[j])
+ break;
+
+ printk(KERN_ERR "b->written %u\n", b->written);
+
+ console_unlock();
+ panic("verify failed at %u\n", j);
+ }
+out:
+ mutex_unlock(&c->verify_lock);
+ btree_node_io_unlock(b);
+}
+
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+
+/* XXX: bch_fs refcounting */
+
+struct dump_iter {
+ struct bpos from;
+ struct bch_fs *c;
+ enum btree_id id;
+
+ char buf[PAGE_SIZE];
+ size_t bytes; /* what's currently in buf */
+
+ char __user *ubuf; /* destination user buffer */
+ size_t size; /* size of requested read */
+ ssize_t ret; /* bytes read so far */
+};
+
+static int flush_buf(struct dump_iter *i)
+{
+ if (i->bytes) {
+ size_t bytes = min(i->bytes, i->size);
+ int err = copy_to_user(i->ubuf, i->buf, bytes);
+
+ if (err)
+ return err;
+
+ i->ret += bytes;
+ i->ubuf += bytes;
+ i->size -= bytes;
+ i->bytes -= bytes;
+ memmove(i->buf, i->buf + bytes, i->bytes);
+ }
+
+ return 0;
+}
+
+static int bch2_dump_open(struct inode *inode, struct file *file)
+{
+ struct btree_debug *bd = inode->i_private;
+ struct dump_iter *i;
+
+ i = kzalloc(sizeof(struct dump_iter), GFP_KERNEL);
+ if (!i)
+ return -ENOMEM;
+
+ file->private_data = i;
+ i->from = POS_MIN;
+ i->c = container_of(bd, struct bch_fs, btree_debug[bd->id]);
+ i->id = bd->id;
+
+ return 0;
+}
+
+static int bch2_dump_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static ssize_t bch2_read_btree(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct dump_iter *i = file->private_data;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int err;
+
+ i->ubuf = buf;
+ i->size = size;
+ i->ret = 0;
+
+ err = flush_buf(i);
+ if (err)
+ return err;
+
+ if (!i->size)
+ return i->ret;
+
+ bch2_btree_iter_init(&iter, i->c, i->id, i->from, BTREE_ITER_PREFETCH);
+ k = bch2_btree_iter_peek(&iter);
+
+ while (k.k && !(err = btree_iter_err(k))) {
+ bch2_bkey_val_to_text(i->c, bkey_type(0, i->id),
+ i->buf, sizeof(i->buf), k);
+ i->bytes = strlen(i->buf);
+ BUG_ON(i->bytes >= PAGE_SIZE);
+ i->buf[i->bytes] = '\n';
+ i->bytes++;
+
+ k = bch2_btree_iter_next(&iter);
+ i->from = iter.pos;
+
+ err = flush_buf(i);
+ if (err)
+ break;
+
+ if (!i->size)
+ break;
+ }
+ bch2_btree_iter_unlock(&iter);
+
+ return err < 0 ? err : i->ret;
+}
+
+static const struct file_operations btree_debug_ops = {
+ .owner = THIS_MODULE,
+ .open = bch2_dump_open,
+ .release = bch2_dump_release,
+ .read = bch2_read_btree,
+};
+
+static ssize_t bch2_read_btree_formats(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct dump_iter *i = file->private_data;
+ struct btree_iter iter;
+ struct btree *b;
+ int err;
+
+ i->ubuf = buf;
+ i->size = size;
+ i->ret = 0;
+
+ err = flush_buf(i);
+ if (err)
+ return err;
+
+ if (!i->size || !bkey_cmp(POS_MAX, i->from))
+ return i->ret;
+
+ for_each_btree_node(&iter, i->c, i->id, i->from, 0, b) {
+ i->bytes = bch2_print_btree_node(i->c, b, i->buf,
+ sizeof(i->buf));
+ err = flush_buf(i);
+ if (err)
+ break;
+
+ /*
+ * can't easily correctly restart a btree node traversal across
+ * all nodes, meh
+ */
+ i->from = bkey_cmp(POS_MAX, b->key.k.p)
+ ? bkey_successor(b->key.k.p)
+ : b->key.k.p;
+
+ if (!i->size)
+ break;
+ }
+ bch2_btree_iter_unlock(&iter);
+
+ return err < 0 ? err : i->ret;
+}
+
+static const struct file_operations btree_format_debug_ops = {
+ .owner = THIS_MODULE,
+ .open = bch2_dump_open,
+ .release = bch2_dump_release,
+ .read = bch2_read_btree_formats,
+};
+
+static ssize_t bch2_read_bfloat_failed(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct dump_iter *i = file->private_data;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct btree *prev_node = NULL;
+ int err;
+
+ i->ubuf = buf;
+ i->size = size;
+ i->ret = 0;
+
+ err = flush_buf(i);
+ if (err)
+ return err;
+
+ if (!i->size)
+ return i->ret;
+
+ bch2_btree_iter_init(&iter, i->c, i->id, i->from, BTREE_ITER_PREFETCH);
+
+ while ((k = bch2_btree_iter_peek(&iter)).k &&
+ !(err = btree_iter_err(k))) {
+ struct btree_iter_level *l = &iter.l[0];
+ struct bkey_packed *_k =
+ bch2_btree_node_iter_peek(&l->iter, l->b);
+
+ if (l->b != prev_node) {
+ i->bytes = bch2_print_btree_node(i->c, l->b, i->buf,
+ sizeof(i->buf));
+ err = flush_buf(i);
+ if (err)
+ break;
+ }
+ prev_node = l->b;
+
+ i->bytes = bch2_bkey_print_bfloat(l->b, _k, i->buf,
+ sizeof(i->buf));
+
+ err = flush_buf(i);
+ if (err)
+ break;
+
+ bch2_btree_iter_next(&iter);
+ i->from = iter.pos;
+
+ err = flush_buf(i);
+ if (err)
+ break;
+
+ if (!i->size)
+ break;
+ }
+ bch2_btree_iter_unlock(&iter);
+
+ return err < 0 ? err : i->ret;
+}
+
+static const struct file_operations bfloat_failed_debug_ops = {
+ .owner = THIS_MODULE,
+ .open = bch2_dump_open,
+ .release = bch2_dump_release,
+ .read = bch2_read_bfloat_failed,
+};
+
+void bch2_fs_debug_exit(struct bch_fs *c)
+{
+ if (!IS_ERR_OR_NULL(c->debug))
+ debugfs_remove_recursive(c->debug);
+}
+
+void bch2_fs_debug_init(struct bch_fs *c)
+{
+ struct btree_debug *bd;
+ char name[100];
+
+ if (IS_ERR_OR_NULL(bch_debug))
+ return;
+
+ snprintf(name, sizeof(name), "%pU", c->sb.user_uuid.b);
+ c->debug = debugfs_create_dir(name, bch_debug);
+ if (IS_ERR_OR_NULL(c->debug))
+ return;
+
+ for (bd = c->btree_debug;
+ bd < c->btree_debug + ARRAY_SIZE(c->btree_debug);
+ bd++) {
+ bd->id = bd - c->btree_debug;
+ bd->btree = debugfs_create_file(bch2_btree_ids[bd->id],
+ 0400, c->debug, bd,
+ &btree_debug_ops);
+
+ snprintf(name, sizeof(name), "%s-formats",
+ bch2_btree_ids[bd->id]);
+
+ bd->btree_format = debugfs_create_file(name, 0400, c->debug, bd,
+ &btree_format_debug_ops);
+
+ snprintf(name, sizeof(name), "%s-bfloat-failed",
+ bch2_btree_ids[bd->id]);
+
+ bd->failed = debugfs_create_file(name, 0400, c->debug, bd,
+ &bfloat_failed_debug_ops);
+ }
+}
+
+#endif
+
+void bch2_debug_exit(void)
+{
+ if (!IS_ERR_OR_NULL(bch_debug))
+ debugfs_remove_recursive(bch_debug);
+}
+
+int __init bch2_debug_init(void)
+{
+ int ret = 0;
+
+ bch_debug = debugfs_create_dir("bcachefs", NULL);
+ return ret;
+}