// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Authors: Artem Bityutskiy (Битюцкий Артём)
 *          Adrian Hunter
 */

/*
 * This file implements most of the debugging stuff which is compiled in only
 * when it is enabled. But some debugging check functions are implemented in
 * corresponding subsystem, just because they are closely related and utilize
 * various local functions of those subsystems.
 */

#include <stdio.h>
#include <unistd.h>

#include "linux_err.h"
#include "bitops.h"
#include "kmem.h"
#include "ubifs.h"
#include "defs.h"
#include "debug.h"
#include "key.h"
#include "misc.h"

static DEFINE_SPINLOCK(dbg_lock);

static const char *get_key_fmt(int fmt)
{
	switch (fmt) {
	case UBIFS_SIMPLE_KEY_FMT:
		return "simple";
	default:
		return "unknown/invalid format";
	}
}

static const char *get_key_hash(int hash)
{
	switch (hash) {
	case UBIFS_KEY_HASH_R5:
		return "R5";
	case UBIFS_KEY_HASH_TEST:
		return "test";
	default:
		return "unknown/invalid name hash";
	}
}

static const char *get_key_type(int type)
{
	switch (type) {
	case UBIFS_INO_KEY:
		return "inode";
	case UBIFS_DENT_KEY:
		return "direntry";
	case UBIFS_XENT_KEY:
		return "xentry";
	case UBIFS_DATA_KEY:
		return "data";
	case UBIFS_TRUN_KEY:
		return "truncate";
	default:
		return "unknown/invalid key";
	}
}

const char *ubifs_get_type_name(int type)
{
	switch (type) {
	case UBIFS_ITYPE_REG:
		return "file";
	case UBIFS_ITYPE_DIR:
		return "dir";
	case UBIFS_ITYPE_LNK:
		return "symlink";
	case UBIFS_ITYPE_BLK:
		return "blkdev";
	case UBIFS_ITYPE_CHR:
		return "char dev";
	case UBIFS_ITYPE_FIFO:
		return "fifo";
	case UBIFS_ITYPE_SOCK:
		return "socket";
	default:
		return "unknown/invalid type";
	}
}

const char *dbg_snprintf_key(const struct ubifs_info *c,
			     const union ubifs_key *key, char *buffer, int len)
{
	char *p = buffer;
	int type = key_type(c, key);

	if (c->key_fmt == UBIFS_SIMPLE_KEY_FMT) {
		switch (type) {
		case UBIFS_INO_KEY:
			len -= snprintf(p, len, "(%lu, %s)",
					(unsigned long)key_inum(c, key),
					get_key_type(type));
			break;
		case UBIFS_DENT_KEY:
		case UBIFS_XENT_KEY:
			len -= snprintf(p, len, "(%lu, %s, %#08x)",
					(unsigned long)key_inum(c, key),
					get_key_type(type), key_hash(c, key));
			break;
		case UBIFS_DATA_KEY:
			len -= snprintf(p, len, "(%lu, %s, %u)",
					(unsigned long)key_inum(c, key),
					get_key_type(type), key_block(c, key));
			break;
		case UBIFS_TRUN_KEY:
			len -= snprintf(p, len, "(%lu, %s)",
					(unsigned long)key_inum(c, key),
					get_key_type(type));
			break;
		default:
			len -= snprintf(p, len, "(bad key type: %#08x, %#08x)",
					key->u32[0], key->u32[1]);
		}
	} else
		len -= snprintf(p, len, "bad key format %d", c->key_fmt);
	ubifs_assert(c, len > 0);
	return p;
}

const char *dbg_ntype(int type)
{
	switch (type) {
	case UBIFS_PAD_NODE:
		return "padding node";
	case UBIFS_SB_NODE:
		return "superblock node";
	case UBIFS_MST_NODE:
		return "master node";
	case UBIFS_REF_NODE:
		return "reference node";
	case UBIFS_INO_NODE:
		return "inode node";
	case UBIFS_DENT_NODE:
		return "direntry node";
	case UBIFS_XENT_NODE:
		return "xentry node";
	case UBIFS_DATA_NODE:
		return "data node";
	case UBIFS_TRUN_NODE:
		return "truncate node";
	case UBIFS_IDX_NODE:
		return "indexing node";
	case UBIFS_CS_NODE:
		return "commit start node";
	case UBIFS_ORPH_NODE:
		return "orphan node";
	case UBIFS_AUTH_NODE:
		return "auth node";
	default:
		return "unknown node";
	}
}

static const char *dbg_gtype(int type)
{
	switch (type) {
	case UBIFS_NO_NODE_GROUP:
		return "no node group";
	case UBIFS_IN_NODE_GROUP:
		return "in node group";
	case UBIFS_LAST_OF_NODE_GROUP:
		return "last of node group";
	default:
		return "unknown";
	}
}

const char *dbg_cstate(int cmt_state)
{
	switch (cmt_state) {
	case COMMIT_RESTING:
		return "commit resting";
	case COMMIT_BACKGROUND:
		return "background commit requested";
	case COMMIT_REQUIRED:
		return "commit required";
	case COMMIT_RUNNING_BACKGROUND:
		return "BACKGROUND commit running";
	case COMMIT_RUNNING_REQUIRED:
		return "commit running and required";
	case COMMIT_BROKEN:
		return "broken commit";
	default:
		return "unknown commit state";
	}
}

const char *dbg_jhead(int jhead)
{
	switch (jhead) {
	case GCHD:
		return "0 (GC)";
	case BASEHD:
		return "1 (base)";
	case DATAHD:
		return "2 (data)";
	default:
		return "unknown journal head";
	}
}

static void dump_ch(const struct ubifs_ch *ch)
{
	pr_err("\tmagic          %#x\n", le32_to_cpu(ch->magic));
	pr_err("\tcrc            %#x\n", le32_to_cpu(ch->crc));
	pr_err("\tnode_type      %d (%s)\n", ch->node_type,
	       dbg_ntype(ch->node_type));
	pr_err("\tgroup_type     %d (%s)\n", ch->group_type,
	       dbg_gtype(ch->group_type));
	pr_err("\tsqnum          %llu\n",
	       (unsigned long long)le64_to_cpu(ch->sqnum));
	pr_err("\tlen            %u\n", le32_to_cpu(ch->len));
}

void ubifs_dump_node(const struct ubifs_info *c, const void *node, int node_len)
{
	int i, n, type, safe_len, max_node_len, min_node_len;
	union ubifs_key key;
	const struct ubifs_ch *ch = node;
	char key_buf[DBG_KEY_BUF_LEN];

	/* If the magic is incorrect, just hexdump the first bytes */
	if (le32_to_cpu(ch->magic) != UBIFS_NODE_MAGIC) {
		pr_err("Not a node, first %zu bytes:", UBIFS_CH_SZ);
		print_hex_dump("", DUMP_PREFIX_OFFSET, 32, 1,
			       (void *)node, UBIFS_CH_SZ, 1);
		return;
	}

	/* Skip dumping unknown type node */
	type = ch->node_type;
	if (type < 0 || type >= UBIFS_NODE_TYPES_CNT) {
		pr_err("node type %d was not recognized\n", type);
		return;
	}

	spin_lock(&dbg_lock);
	dump_ch(node);

	if (c->ranges[type].max_len == 0) {
		max_node_len = min_node_len = c->ranges[type].len;
	} else {
		max_node_len = c->ranges[type].max_len;
		min_node_len = c->ranges[type].min_len;
	}
	safe_len = le32_to_cpu(ch->len);
	safe_len = safe_len > 0 ? safe_len : 0;
	safe_len = min3(safe_len, max_node_len, node_len);
	if (safe_len < min_node_len) {
		pr_err("node len(%d) is too short for %s, left %d bytes:\n",
		       safe_len, dbg_ntype(type),
		       safe_len > UBIFS_CH_SZ ?
		       safe_len - (int)UBIFS_CH_SZ : 0);
		if (safe_len > UBIFS_CH_SZ)
			print_hex_dump("", DUMP_PREFIX_OFFSET, 32, 1,
				       (void *)node + UBIFS_CH_SZ,
				       safe_len - UBIFS_CH_SZ, 0);
		goto out_unlock;
	}
	if (safe_len != le32_to_cpu(ch->len))
		pr_err("\ttruncated node length      %d\n", safe_len);

	switch (type) {
	case UBIFS_PAD_NODE:
	{
		const struct ubifs_pad_node *pad = node;

		pr_err("\tpad_len        %u\n", le32_to_cpu(pad->pad_len));
		break;
	}
	case UBIFS_SB_NODE:
	{
		const struct ubifs_sb_node *sup = node;
		unsigned int sup_flags = le32_to_cpu(sup->flags);

		pr_err("\tkey_hash       %d (%s)\n",
		       (int)sup->key_hash, get_key_hash(sup->key_hash));
		pr_err("\tkey_fmt        %d (%s)\n",
		       (int)sup->key_fmt, get_key_fmt(sup->key_fmt));
		pr_err("\tflags          %#x\n", sup_flags);
		pr_err("\tbig_lpt        %u\n",
		       !!(sup_flags & UBIFS_FLG_BIGLPT));
		pr_err("\tspace_fixup    %u\n",
		       !!(sup_flags & UBIFS_FLG_SPACE_FIXUP));
		pr_err("\tmin_io_size    %u\n", le32_to_cpu(sup->min_io_size));
		pr_err("\tleb_size       %u\n", le32_to_cpu(sup->leb_size));
		pr_err("\tleb_cnt        %u\n", le32_to_cpu(sup->leb_cnt));
		pr_err("\tmax_leb_cnt    %u\n", le32_to_cpu(sup->max_leb_cnt));
		pr_err("\tmax_bud_bytes  %llu\n",
		       (unsigned long long)le64_to_cpu(sup->max_bud_bytes));
		pr_err("\tlog_lebs       %u\n", le32_to_cpu(sup->log_lebs));
		pr_err("\tlpt_lebs       %u\n", le32_to_cpu(sup->lpt_lebs));
		pr_err("\torph_lebs      %u\n", le32_to_cpu(sup->orph_lebs));
		pr_err("\tjhead_cnt      %u\n", le32_to_cpu(sup->jhead_cnt));
		pr_err("\tfanout         %u\n", le32_to_cpu(sup->fanout));
		pr_err("\tlsave_cnt      %u\n", le32_to_cpu(sup->lsave_cnt));
		pr_err("\tdefault_compr  %u\n",
		       (int)le16_to_cpu(sup->default_compr));
		pr_err("\trp_size        %llu\n",
		       (unsigned long long)le64_to_cpu(sup->rp_size));
		pr_err("\trp_uid         %u\n", le32_to_cpu(sup->rp_uid));
		pr_err("\trp_gid         %u\n", le32_to_cpu(sup->rp_gid));
		pr_err("\tfmt_version    %u\n", le32_to_cpu(sup->fmt_version));
		pr_err("\ttime_gran      %u\n", le32_to_cpu(sup->time_gran));
		pr_err("\tUUID           %pUB\n", sup->uuid);
		break;
	}
	case UBIFS_MST_NODE:
	{
		const struct ubifs_mst_node *mst = node;

		pr_err("\thighest_inum   %llu\n",
		       (unsigned long long)le64_to_cpu(mst->highest_inum));
		pr_err("\tcommit number  %llu\n",
		       (unsigned long long)le64_to_cpu(mst->cmt_no));
		pr_err("\tflags          %#x\n", le32_to_cpu(mst->flags));
		pr_err("\tlog_lnum       %u\n", le32_to_cpu(mst->log_lnum));
		pr_err("\troot_lnum      %u\n", le32_to_cpu(mst->root_lnum));
		pr_err("\troot_offs      %u\n", le32_to_cpu(mst->root_offs));
		pr_err("\troot_len       %u\n", le32_to_cpu(mst->root_len));
		pr_err("\tgc_lnum        %u\n", le32_to_cpu(mst->gc_lnum));
		pr_err("\tihead_lnum     %u\n", le32_to_cpu(mst->ihead_lnum));
		pr_err("\tihead_offs     %u\n", le32_to_cpu(mst->ihead_offs));
		pr_err("\tindex_size     %llu\n",
		       (unsigned long long)le64_to_cpu(mst->index_size));
		pr_err("\tlpt_lnum       %u\n", le32_to_cpu(mst->lpt_lnum));
		pr_err("\tlpt_offs       %u\n", le32_to_cpu(mst->lpt_offs));
		pr_err("\tnhead_lnum     %u\n", le32_to_cpu(mst->nhead_lnum));
		pr_err("\tnhead_offs     %u\n", le32_to_cpu(mst->nhead_offs));
		pr_err("\tltab_lnum      %u\n", le32_to_cpu(mst->ltab_lnum));
		pr_err("\tltab_offs      %u\n", le32_to_cpu(mst->ltab_offs));
		pr_err("\tlsave_lnum     %u\n", le32_to_cpu(mst->lsave_lnum));
		pr_err("\tlsave_offs     %u\n", le32_to_cpu(mst->lsave_offs));
		pr_err("\tlscan_lnum     %u\n", le32_to_cpu(mst->lscan_lnum));
		pr_err("\tleb_cnt        %u\n", le32_to_cpu(mst->leb_cnt));
		pr_err("\tempty_lebs     %u\n", le32_to_cpu(mst->empty_lebs));
		pr_err("\tidx_lebs       %u\n", le32_to_cpu(mst->idx_lebs));
		pr_err("\ttotal_free     %llu\n",
		       (unsigned long long)le64_to_cpu(mst->total_free));
		pr_err("\ttotal_dirty    %llu\n",
		       (unsigned long long)le64_to_cpu(mst->total_dirty));
		pr_err("\ttotal_used     %llu\n",
		       (unsigned long long)le64_to_cpu(mst->total_used));
		pr_err("\ttotal_dead     %llu\n",
		       (unsigned long long)le64_to_cpu(mst->total_dead));
		pr_err("\ttotal_dark     %llu\n",
		       (unsigned long long)le64_to_cpu(mst->total_dark));
		break;
	}
	case UBIFS_REF_NODE:
	{
		const struct ubifs_ref_node *ref = node;

		pr_err("\tlnum           %u\n", le32_to_cpu(ref->lnum));
		pr_err("\toffs           %u\n", le32_to_cpu(ref->offs));
		pr_err("\tjhead          %u\n", le32_to_cpu(ref->jhead));
		break;
	}
	case UBIFS_INO_NODE:
	{
		const struct ubifs_ino_node *ino = node;

		key_read(c, &ino->key, &key);
		pr_err("\tkey            %s\n",
		       dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
		pr_err("\tcreat_sqnum    %llu\n",
		       (unsigned long long)le64_to_cpu(ino->creat_sqnum));
		pr_err("\tsize           %llu\n",
		       (unsigned long long)le64_to_cpu(ino->size));
		pr_err("\tnlink          %u\n", le32_to_cpu(ino->nlink));
		pr_err("\tatime          %lld.%u\n",
		       (long long)le64_to_cpu(ino->atime_sec),
		       le32_to_cpu(ino->atime_nsec));
		pr_err("\tmtime          %lld.%u\n",
		       (long long)le64_to_cpu(ino->mtime_sec),
		       le32_to_cpu(ino->mtime_nsec));
		pr_err("\tctime          %lld.%u\n",
		       (long long)le64_to_cpu(ino->ctime_sec),
		       le32_to_cpu(ino->ctime_nsec));
		pr_err("\tuid            %u\n", le32_to_cpu(ino->uid));
		pr_err("\tgid            %u\n", le32_to_cpu(ino->gid));
		pr_err("\tmode           %u\n", le32_to_cpu(ino->mode));
		pr_err("\tflags          %#x\n", le32_to_cpu(ino->flags));
		pr_err("\txattr_cnt      %u\n", le32_to_cpu(ino->xattr_cnt));
		pr_err("\txattr_size     %u\n", le32_to_cpu(ino->xattr_size));
		pr_err("\txattr_names    %u\n", le32_to_cpu(ino->xattr_names));
		pr_err("\tcompr_type     %#x\n",
		       (int)le16_to_cpu(ino->compr_type));
		pr_err("\tdata len       %u\n", le32_to_cpu(ino->data_len));
		break;
	}
	case UBIFS_DENT_NODE:
	case UBIFS_XENT_NODE:
	{
		const struct ubifs_dent_node *dent = node;
		int nlen = le16_to_cpu(dent->nlen);

		key_read(c, &dent->key, &key);
		pr_err("\tkey            %s\n",
		       dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
		pr_err("\tinum           %llu\n",
		       (unsigned long long)le64_to_cpu(dent->inum));
		pr_err("\ttype           %d\n", (int)dent->type);
		pr_err("\tnlen           %d\n", nlen);
		pr_err("\tname           ");

		if (nlen > UBIFS_MAX_NLEN ||
		    nlen > safe_len - UBIFS_DENT_NODE_SZ)
			pr_err("(bad name length, not printing, bad or corrupted node)");
		else {
			for (i = 0; i < nlen && dent->name[i]; i++)
				pr_cont("%c", isprint(dent->name[i]) ?
					dent->name[i] : '?');
		}
		pr_cont("\n");

		break;
	}
	case UBIFS_DATA_NODE:
	{
		const struct ubifs_data_node *dn = node;

		key_read(c, &dn->key, &key);
		pr_err("\tkey            %s\n",
		       dbg_snprintf_key(c, &key, key_buf, DBG_KEY_BUF_LEN));
		pr_err("\tsize           %u\n", le32_to_cpu(dn->size));
		pr_err("\tcompr_typ      %d\n",
		       (int)le16_to_cpu(dn->compr_type));
		pr_err("\tdata size      %u\n",
		       le32_to_cpu(ch->len) - (unsigned int)UBIFS_DATA_NODE_SZ);
		pr_err("\tdata (length = %d):\n",
		       safe_len - (int)UBIFS_DATA_NODE_SZ);
		print_hex_dump("\t", DUMP_PREFIX_OFFSET, 32, 1,
			       (void *)&dn->data,
			       safe_len - (int)UBIFS_DATA_NODE_SZ, 0);
		break;
	}
	case UBIFS_TRUN_NODE:
	{
		const struct ubifs_trun_node *trun = node;

		pr_err("\tinum           %u\n", le32_to_cpu(trun->inum));
		pr_err("\told_size       %llu\n",
		       (unsigned long long)le64_to_cpu(trun->old_size));
		pr_err("\tnew_size       %llu\n",
		       (unsigned long long)le64_to_cpu(trun->new_size));
		break;
	}
	case UBIFS_IDX_NODE:
	{
		const struct ubifs_idx_node *idx = node;
		int max_child_cnt = (safe_len - UBIFS_IDX_NODE_SZ) /
				    (ubifs_idx_node_sz(c, 1) -
				    UBIFS_IDX_NODE_SZ);

		n = min_t(int, le16_to_cpu(idx->child_cnt), max_child_cnt);
		pr_err("\tchild_cnt      %d\n", (int)le16_to_cpu(idx->child_cnt));
		pr_err("\tlevel          %d\n", (int)le16_to_cpu(idx->level));
		pr_err("\tBranches:\n");

		for (i = 0; i < n && i < c->fanout; i++) {
			const struct ubifs_branch *br;

			br = ubifs_idx_branch(c, idx, i);
			key_read(c, &br->key, &key);
			pr_err("\t%d: LEB %d:%d len %d key %s\n",
			       i, le32_to_cpu(br->lnum), le32_to_cpu(br->offs),
			       le32_to_cpu(br->len),
			       dbg_snprintf_key(c, &key, key_buf,
						DBG_KEY_BUF_LEN));
		}
		break;
	}
	case UBIFS_CS_NODE:
		break;
	case UBIFS_ORPH_NODE:
	{
		const struct ubifs_orph_node *orph = node;

		pr_err("\tcommit number  %llu\n",
		       (unsigned long long)
				le64_to_cpu(orph->cmt_no) & LLONG_MAX);
		pr_err("\tlast node flag %llu\n",
		       (unsigned long long)(le64_to_cpu(orph->cmt_no)) >> 63);
		n = (safe_len - UBIFS_ORPH_NODE_SZ) >> 3;
		pr_err("\t%d orphan inode numbers:\n", n);
		for (i = 0; i < n; i++)
			pr_err("\t  ino %llu\n",
			       (unsigned long long)le64_to_cpu(orph->inos[i]));
		break;
	}
	case UBIFS_AUTH_NODE:
	{
		break;
	}
	default:
		pr_err("node type %d was not recognized\n", type);
	}

out_unlock:
	spin_unlock(&dbg_lock);
}

void ubifs_dump_lstats(const struct ubifs_lp_stats *lst)
{
	spin_lock(&dbg_lock);
	pr_err("(pid %d) Lprops statistics: empty_lebs %d, idx_lebs  %d\n",
	       getpid(), lst->empty_lebs, lst->idx_lebs);
	pr_err("\ttaken_empty_lebs %d, total_free %lld, total_dirty %lld\n",
	       lst->taken_empty_lebs, lst->total_free, lst->total_dirty);
	pr_err("\ttotal_used %lld, total_dark %lld, total_dead %lld\n",
	       lst->total_used, lst->total_dark, lst->total_dead);
	spin_unlock(&dbg_lock);
}

void ubifs_dump_budg(struct ubifs_info *c, const struct ubifs_budg_info *bi)
{
	int i;
	struct rb_node *rb;
	struct ubifs_bud *bud;
	struct ubifs_gced_idx_leb *idx_gc;
	long long available, outstanding, free;

	spin_lock(&c->space_lock);
	spin_lock(&dbg_lock);
	pr_err("(pid %d) Budgeting info: data budget sum %lld, total budget sum %lld\n",
	       getpid(), bi->data_growth + bi->dd_growth,
	       bi->data_growth + bi->dd_growth + bi->idx_growth);
	pr_err("\tbudg_data_growth %lld, budg_dd_growth %lld, budg_idx_growth %lld\n",
	       bi->data_growth, bi->dd_growth, bi->idx_growth);
	pr_err("\tmin_idx_lebs %d, old_idx_sz %llu, uncommitted_idx %lld\n",
	       bi->min_idx_lebs, bi->old_idx_sz, bi->uncommitted_idx);
	pr_err("\tpage_budget %d, inode_budget %d, dent_budget %d\n",
	       bi->page_budget, bi->inode_budget, bi->dent_budget);
	pr_err("\tnospace %u, nospace_rp %u\n", bi->nospace, bi->nospace_rp);
	pr_err("\tdark_wm %d, dead_wm %d, max_idx_node_sz %d\n",
	       c->dark_wm, c->dead_wm, c->max_idx_node_sz);

	if (bi != &c->bi)
		/*
		 * If we are dumping saved budgeting data, do not print
		 * additional information which is about the current state, not
		 * the old one which corresponded to the saved budgeting data.
		 */
		goto out_unlock;

	pr_err("\tfreeable_cnt %d, calc_idx_sz %lld, idx_gc_cnt %d\n",
	       c->freeable_cnt, c->calc_idx_sz, c->idx_gc_cnt);
	pr_err("\tdirty_pg_cnt %ld, dirty_zn_cnt %ld, clean_zn_cnt %ld\n",
	       atomic_long_read(&c->dirty_pg_cnt),
	       atomic_long_read(&c->dirty_zn_cnt),
	       atomic_long_read(&c->clean_zn_cnt));
	pr_err("\tgc_lnum %d, ihead_lnum %d\n", c->gc_lnum, c->ihead_lnum);

	/* If we are in R/O mode, journal heads do not exist */
	if (c->jheads)
		for (i = 0; i < c->jhead_cnt; i++)
			pr_err("\tjhead %s\t LEB %d\n",
			       dbg_jhead(c->jheads[i].wbuf.jhead),
			       c->jheads[i].wbuf.lnum);
	for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
		bud = rb_entry(rb, struct ubifs_bud, rb);
		pr_err("\tbud LEB %d\n", bud->lnum);
	}
	list_for_each_entry(bud, &c->old_buds, list)
		pr_err("\told bud LEB %d\n", bud->lnum);
	list_for_each_entry(idx_gc, &c->idx_gc, list)
		pr_err("\tGC'ed idx LEB %d unmap %d\n",
		       idx_gc->lnum, idx_gc->unmap);
	pr_err("\tcommit state %d\n", c->cmt_state);

	/* Print budgeting predictions */
	available = ubifs_calc_available(c, c->bi.min_idx_lebs);
	outstanding = c->bi.data_growth + c->bi.dd_growth;
	free = ubifs_get_free_space_nolock(c);
	pr_err("Budgeting predictions:\n");
	pr_err("\tavailable: %lld, outstanding %lld, free %lld\n",
	       available, outstanding, free);
out_unlock:
	spin_unlock(&dbg_lock);
	spin_unlock(&c->space_lock);
}

void ubifs_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
{
	int i, spc, dark = 0, dead = 0;
	struct rb_node *rb;
	struct ubifs_bud *bud;

	spc = lp->free + lp->dirty;
	if (spc < c->dead_wm)
		dead = spc;
	else
		dark = ubifs_calc_dark(c, spc);

	if (lp->flags & LPROPS_INDEX)
		pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d flags %#x (",
		       lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
		       lp->flags);
	else
		pr_err("LEB %-7d free %-8d dirty %-8d used %-8d free + dirty %-8d dark %-4d dead %-4d nodes fit %-3d flags %#-4x (",
		       lp->lnum, lp->free, lp->dirty, c->leb_size - spc, spc,
		       dark, dead, (int)(spc / UBIFS_MAX_NODE_SZ), lp->flags);

	if (lp->flags & LPROPS_TAKEN) {
		if (lp->flags & LPROPS_INDEX)
			pr_cont("index, taken");
		else
			pr_cont("taken");
	} else {
		const char *s;

		if (lp->flags & LPROPS_INDEX) {
			switch (lp->flags & LPROPS_CAT_MASK) {
			case LPROPS_DIRTY_IDX:
				s = "dirty index";
				break;
			case LPROPS_FRDI_IDX:
				s = "freeable index";
				break;
			default:
				s = "index";
			}
		} else {
			switch (lp->flags & LPROPS_CAT_MASK) {
			case LPROPS_UNCAT:
				s = "not categorized";
				break;
			case LPROPS_DIRTY:
				s = "dirty";
				break;
			case LPROPS_FREE:
				s = "free";
				break;
			case LPROPS_EMPTY:
				s = "empty";
				break;
			case LPROPS_FREEABLE:
				s = "freeable";
				break;
			default:
				s = NULL;
				break;
			}
		}
		pr_cont("%s", s);
	}

	for (rb = rb_first((struct rb_root *)&c->buds); rb; rb = rb_next(rb)) {
		bud = rb_entry(rb, struct ubifs_bud, rb);
		if (bud->lnum == lp->lnum) {
			int head = 0;
			for (i = 0; i < c->jhead_cnt; i++) {
				/*
				 * Note, if we are in R/O mode or in the middle
				 * of mounting/re-mounting, the write-buffers do
				 * not exist.
				 */
				if (c->jheads &&
				    lp->lnum == c->jheads[i].wbuf.lnum) {
					pr_cont(", jhead %s", dbg_jhead(i));
					head = 1;
				}
			}
			if (!head)
				pr_cont(", bud of jhead %s",
				       dbg_jhead(bud->jhead));
		}
	}
	if (lp->lnum == c->gc_lnum)
		pr_cont(", GC LEB");
	pr_cont(")\n");
}

void ubifs_dump_lprops(struct ubifs_info *c)
{
	int lnum, err;
	struct ubifs_lprops lp;
	struct ubifs_lp_stats lst;

	pr_err("(pid %d) start dumping LEB properties\n", getpid());
	ubifs_get_lp_stats(c, &lst);
	ubifs_dump_lstats(&lst);

	for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) {
		err = ubifs_read_one_lp(c, lnum, &lp);
		if (err) {
			ubifs_err(c, "cannot read lprops for LEB %d", lnum);
			continue;
		}

		ubifs_dump_lprop(c, &lp);
	}
	pr_err("(pid %d) finish dumping LEB properties\n", getpid());
}

void ubifs_dump_lpt_info(struct ubifs_info *c)
{
	int i;

	spin_lock(&dbg_lock);
	pr_err("(pid %d) dumping LPT information\n", getpid());
	pr_err("\tlpt_sz:        %lld\n", c->lpt_sz);
	pr_err("\tpnode_sz:      %d\n", c->pnode_sz);
	pr_err("\tnnode_sz:      %d\n", c->nnode_sz);
	pr_err("\tltab_sz:       %d\n", c->ltab_sz);
	pr_err("\tlsave_sz:      %d\n", c->lsave_sz);
	pr_err("\tbig_lpt:       %u\n", c->big_lpt);
	pr_err("\tlpt_hght:      %d\n", c->lpt_hght);
	pr_err("\tpnode_cnt:     %d\n", c->pnode_cnt);
	pr_err("\tnnode_cnt:     %d\n", c->nnode_cnt);
	pr_err("\tdirty_pn_cnt:  %d\n", c->dirty_pn_cnt);
	pr_err("\tdirty_nn_cnt:  %d\n", c->dirty_nn_cnt);
	pr_err("\tlsave_cnt:     %d\n", c->lsave_cnt);
	pr_err("\tspace_bits:    %d\n", c->space_bits);
	pr_err("\tlpt_lnum_bits: %d\n", c->lpt_lnum_bits);
	pr_err("\tlpt_offs_bits: %d\n", c->lpt_offs_bits);
	pr_err("\tlpt_spc_bits:  %d\n", c->lpt_spc_bits);
	pr_err("\tpcnt_bits:     %d\n", c->pcnt_bits);
	pr_err("\tlnum_bits:     %d\n", c->lnum_bits);
	pr_err("\tLPT root is at %d:%d\n", c->lpt_lnum, c->lpt_offs);
	pr_err("\tLPT head is at %d:%d\n",
	       c->nhead_lnum, c->nhead_offs);
	pr_err("\tLPT ltab is at %d:%d\n", c->ltab_lnum, c->ltab_offs);
	if (c->big_lpt)
		pr_err("\tLPT lsave is at %d:%d\n",
		       c->lsave_lnum, c->lsave_offs);
	for (i = 0; i < c->lpt_lebs; i++)
		pr_err("\tLPT LEB %d free %d dirty %d tgc %d cmt %d\n",
		       i + c->lpt_first, c->ltab[i].free, c->ltab[i].dirty,
		       c->ltab[i].tgc, c->ltab[i].cmt);
	spin_unlock(&dbg_lock);
}

void ubifs_dump_leb(const struct ubifs_info *c, int lnum)
{
	struct ubifs_scan_leb *sleb;
	struct ubifs_scan_node *snod;
	void *buf;

	pr_err("(pid %d) start dumping LEB %d\n", getpid(), lnum);

	buf = __vmalloc(c->leb_size, GFP_NOFS);
	if (!buf) {
		ubifs_err(c, "cannot allocate memory for dumping LEB %d", lnum);
		return;
	}

	sleb = ubifs_scan(c, lnum, 0, buf, 0);
	if (IS_ERR(sleb)) {
		ubifs_err(c, "scan error %d", (int)PTR_ERR(sleb));
		goto out;
	}

	pr_err("LEB %d has %d nodes ending at %d\n", lnum,
	       sleb->nodes_cnt, sleb->endpt);

	list_for_each_entry(snod, &sleb->nodes, list) {
		cond_resched();
		pr_err("Dumping node at LEB %d:%d len %d\n", lnum,
		       snod->offs, snod->len);
		ubifs_dump_node(c, snod->node, c->leb_size - snod->offs);
	}

	pr_err("(pid %d) finish dumping LEB %d\n", getpid(), lnum);
	ubifs_scan_destroy(sleb);

out:
	vfree(buf);
	return;
}

void ubifs_dump_znode(const struct ubifs_info *c,
		      const struct ubifs_znode *znode)
{
	int n;
	const struct ubifs_zbranch *zbr;
	char key_buf[DBG_KEY_BUF_LEN];

	spin_lock(&dbg_lock);
	if (znode->parent)
		zbr = &znode->parent->zbranch[znode->iip];
	else
		zbr = &c->zroot;

	pr_err("znode %p, LEB %d:%d len %d parent %p iip %d level %d child_cnt %d flags %lx\n",
	       znode, zbr->lnum, zbr->offs, zbr->len, znode->parent, znode->iip,
	       znode->level, znode->child_cnt, znode->flags);

	if (znode->child_cnt <= 0 || znode->child_cnt > c->fanout) {
		spin_unlock(&dbg_lock);
		return;
	}

	pr_err("zbranches:\n");
	for (n = 0; n < znode->child_cnt; n++) {
		zbr = &znode->zbranch[n];
		if (znode->level > 0)
			pr_err("\t%d: znode %p LEB %d:%d len %d key %s\n",
			       n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
			       dbg_snprintf_key(c, &zbr->key, key_buf,
						DBG_KEY_BUF_LEN));
		else
			pr_err("\t%d: LNC %p LEB %d:%d len %d key %s\n",
			       n, zbr->znode, zbr->lnum, zbr->offs, zbr->len,
			       dbg_snprintf_key(c, &zbr->key, key_buf,
						DBG_KEY_BUF_LEN));
	}
	spin_unlock(&dbg_lock);
}

void ubifs_dump_heap(__unused struct ubifs_info *c, struct ubifs_lpt_heap *heap,
		     int cat)
{
	int i;

	pr_err("(pid %d) start dumping heap cat %d (%d elements)\n",
	       getpid(), cat, heap->cnt);
	for (i = 0; i < heap->cnt; i++) {
		struct ubifs_lprops *lprops = heap->arr[i];

		pr_err("\t%d. LEB %d hpos %d free %d dirty %d flags %d\n",
		       i, lprops->lnum, lprops->hpos, lprops->free,
		       lprops->dirty, lprops->flags);
	}
	pr_err("(pid %d) finish dumping heap\n", getpid());
}

void ubifs_dump_pnode(__unused struct ubifs_info *c, struct ubifs_pnode *pnode,
		      struct ubifs_nnode *parent, int iip)
{
	int i;

	pr_err("(pid %d) dumping pnode:\n", getpid());
	pr_err("\taddress %zx parent %zx cnext %zx\n",
	       (size_t)pnode, (size_t)parent, (size_t)pnode->cnext);
	pr_err("\tflags %lu iip %d level %d num %d\n",
	       pnode->flags, iip, pnode->level, pnode->num);
	for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
		struct ubifs_lprops *lp = &pnode->lprops[i];

		pr_err("\t%d: free %d dirty %d flags %d lnum %d\n",
		       i, lp->free, lp->dirty, lp->flags, lp->lnum);
	}
}

/**
 * dbg_walk_index - walk the on-flash index.
 * @c: UBIFS file-system description object
 * @leaf_cb: called for each leaf node
 * @znode_cb: called for each indexing node
 * @priv: private data which is passed to callbacks
 *
 * This function walks the UBIFS index and calls the @leaf_cb for each leaf
 * node and @znode_cb for each indexing node. Returns zero in case of success
 * and a negative error code in case of failure.
 *
 * It would be better if this function removed every znode it pulled to into
 * the TNC, so that the behavior more closely matched the non-debugging
 * behavior.
 */
int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
		   dbg_znode_callback znode_cb, void *priv)
{
	int err;
	struct ubifs_zbranch *zbr;
	struct ubifs_znode *znode, *child;

	mutex_lock(&c->tnc_mutex);
	/* If the root indexing node is not in TNC - pull it */
	if (!c->zroot.znode) {
		c->zroot.znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
		if (IS_ERR(c->zroot.znode)) {
			err = PTR_ERR(c->zroot.znode);
			c->zroot.znode = NULL;
			goto out_unlock;
		}
	}

	/*
	 * We are going to traverse the indexing tree in the postorder manner.
	 * Go down and find the leftmost indexing node where we are going to
	 * start from.
	 */
	znode = c->zroot.znode;
	while (znode->level > 0) {
		zbr = &znode->zbranch[0];
		child = zbr->znode;
		if (!child) {
			child = ubifs_load_znode(c, zbr, znode, 0);
			if (IS_ERR(child)) {
				err = PTR_ERR(child);
				goto out_unlock;
			}
		}

		znode = child;
	}

	/* Iterate over all indexing nodes */
	while (1) {
		int idx;

		cond_resched();

		if (znode_cb) {
			err = znode_cb(c, znode, priv);
			if (err) {
				ubifs_err(c, "znode checking function returned error %d",
					  err);
				ubifs_dump_znode(c, znode);
				goto out_dump;
			}
		}
		if (leaf_cb && znode->level == 0) {
			for (idx = 0; idx < znode->child_cnt; idx++) {
				zbr = &znode->zbranch[idx];
				err = leaf_cb(c, zbr, priv);
				if (err) {
					ubifs_err(c, "leaf checking function returned error %d, for leaf at LEB %d:%d",
						  err, zbr->lnum, zbr->offs);
					goto out_dump;
				}
			}
		}

		if (!znode->parent)
			break;

		idx = znode->iip + 1;
		znode = znode->parent;
		if (idx < znode->child_cnt) {
			/* Switch to the next index in the parent */
			zbr = &znode->zbranch[idx];
			child = zbr->znode;
			if (!child) {
				child = ubifs_load_znode(c, zbr, znode, idx);
				if (IS_ERR(child)) {
					err = PTR_ERR(child);
					goto out_unlock;
				}
				zbr->znode = child;
			}
			znode = child;
		} else
			/*
			 * This is the last child, switch to the parent and
			 * continue.
			 */
			continue;

		/* Go to the lowest leftmost znode in the new sub-tree */
		while (znode->level > 0) {
			zbr = &znode->zbranch[0];
			child = zbr->znode;
			if (!child) {
				child = ubifs_load_znode(c, zbr, znode, 0);
				if (IS_ERR(child)) {
					err = PTR_ERR(child);
					goto out_unlock;
				}
				zbr->znode = child;
			}
			znode = child;
		}
	}

	mutex_unlock(&c->tnc_mutex);
	return 0;

out_dump:
	if (znode->parent)
		zbr = &znode->parent->zbranch[znode->iip];
	else
		zbr = &c->zroot;
	ubifs_msg(c, "dump of znode at LEB %d:%d", zbr->lnum, zbr->offs);
	ubifs_dump_znode(c, znode);
out_unlock:
	mutex_unlock(&c->tnc_mutex);
	return err;
}

/**
 * add_size - add znode size to partially calculated index size.
 * @c: UBIFS file-system description object
 * @znode: znode to add size for
 * @priv: partially calculated index size
 *
 * This is a helper function for 'dbg_check_idx_size()' which is called for
 * every indexing node and adds its size to the 'long long' variable pointed to
 * by @priv.
 */
int add_size(struct ubifs_info *c, struct ubifs_znode *znode, void *priv)
{
	long long *idx_size = priv;
	int add;

	add = ubifs_idx_node_sz(c, znode->child_cnt);
	add = ALIGN(add, 8);
	*idx_size += add;
	return 0;
}

void ubifs_assert_failed(struct ubifs_info *c, const char *expr,
			 const char *file, int line)
{
	ubifs_err(c, "UBIFS assert failed: %s, in %s:%u", expr, file, line);

	/*
	 * Different from linux kernel.
	 * Invoke callback function if there is one, otherwise make filesystem
	 * readonly when assertion is failed.
	 */
	if (c->assert_failed_cb)
		c->assert_failed_cb(c);
	else
		ubifs_ro_mode(c, -EINVAL);
}