fastmap.c 40.3 KB
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/*
 * Copyright (c) 2012 Linutronix GmbH
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 * Copyright (c) 2014 sigma star gmbh
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 * Author: Richard Weinberger <richard@nod.at>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
 * the GNU General Public License for more details.
 *
 */

#include <linux/crc32.h>
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#include <linux/bitmap.h>
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#include "ubi.h"

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/**
 * init_seen - allocate memory for used for debugging.
 * @ubi: UBI device description object
 */
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static inline unsigned long *init_seen(struct ubi_device *ubi)
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{
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	unsigned long *ret;
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	if (!ubi_dbg_chk_fastmap(ubi))
		return NULL;

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	ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
		      GFP_KERNEL);
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	if (!ret)
		return ERR_PTR(-ENOMEM);

	return ret;
}

/**
 * free_seen - free the seen logic integer array.
 * @seen: integer array of @ubi->peb_count size
 */
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static inline void free_seen(unsigned long *seen)
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{
	kfree(seen);
}

/**
 * set_seen - mark a PEB as seen.
 * @ubi: UBI device description object
 * @pnum: The PEB to be makred as seen
 * @seen: integer array of @ubi->peb_count size
 */
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static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen)
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{
	if (!ubi_dbg_chk_fastmap(ubi) || !seen)
		return;

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	set_bit(pnum, seen);
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}

/**
 * self_check_seen - check whether all PEB have been seen by fastmap.
 * @ubi: UBI device description object
 * @seen: integer array of @ubi->peb_count size
 */
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static int self_check_seen(struct ubi_device *ubi, unsigned long *seen)
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{
	int pnum, ret = 0;

	if (!ubi_dbg_chk_fastmap(ubi) || !seen)
		return 0;

	for (pnum = 0; pnum < ubi->peb_count; pnum++) {
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		if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) {
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			ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum);
			ret = -EINVAL;
		}
	}

	return ret;
}

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/**
 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
 * @ubi: UBI device description object
 */
size_t ubi_calc_fm_size(struct ubi_device *ubi)
{
	size_t size;

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	size = sizeof(struct ubi_fm_sb) +
		sizeof(struct ubi_fm_hdr) +
		sizeof(struct ubi_fm_scan_pool) +
		sizeof(struct ubi_fm_scan_pool) +
		(ubi->peb_count * sizeof(struct ubi_fm_ec)) +
		(sizeof(struct ubi_fm_eba) +
		(ubi->peb_count * sizeof(__be32))) +
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		sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
	return roundup(size, ubi->leb_size);
}


/**
 * new_fm_vhdr - allocate a new volume header for fastmap usage.
 * @ubi: UBI device description object
 * @vol_id: the VID of the new header
 *
 * Returns a new struct ubi_vid_hdr on success.
 * NULL indicates out of memory.
 */
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static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id)
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{
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	struct ubi_vid_io_buf *new;
	struct ubi_vid_hdr *vh;
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	new = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
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	if (!new)
		goto out;

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	vh = ubi_get_vid_hdr(new);
	vh->vol_type = UBI_VID_DYNAMIC;
	vh->vol_id = cpu_to_be32(vol_id);
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	/* UBI implementations without fastmap support have to delete the
	 * fastmap.
	 */
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	vh->compat = UBI_COMPAT_DELETE;
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out:
	return new;
}

/**
 * add_aeb - create and add a attach erase block to a given list.
 * @ai: UBI attach info object
 * @list: the target list
 * @pnum: PEB number of the new attach erase block
 * @ec: erease counter of the new LEB
 * @scrub: scrub this PEB after attaching
 *
 * Returns 0 on success, < 0 indicates an internal error.
 */
static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
		   int pnum, int ec, int scrub)
{
	struct ubi_ainf_peb *aeb;

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	aeb = ubi_alloc_aeb(ai, pnum, ec);
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	if (!aeb)
		return -ENOMEM;

	aeb->lnum = -1;
	aeb->scrub = scrub;
	aeb->copy_flag = aeb->sqnum = 0;

	ai->ec_sum += aeb->ec;
	ai->ec_count++;

	if (ai->max_ec < aeb->ec)
		ai->max_ec = aeb->ec;

	if (ai->min_ec > aeb->ec)
		ai->min_ec = aeb->ec;

	list_add_tail(&aeb->u.list, list);

	return 0;
}

/**
 * add_vol - create and add a new volume to ubi_attach_info.
 * @ai: ubi_attach_info object
 * @vol_id: VID of the new volume
 * @used_ebs: number of used EBS
 * @data_pad: data padding value of the new volume
 * @vol_type: volume type
 * @last_eb_bytes: number of bytes in the last LEB
 *
 * Returns the new struct ubi_ainf_volume on success.
 * NULL indicates an error.
 */
static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
				       int used_ebs, int data_pad, u8 vol_type,
				       int last_eb_bytes)
{
	struct ubi_ainf_volume *av;

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	av = ubi_add_av(ai, vol_id);
	if (IS_ERR(av))
		return av;
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	av->data_pad = data_pad;
	av->last_data_size = last_eb_bytes;
	av->compat = 0;
	av->vol_type = vol_type;
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	if (av->vol_type == UBI_STATIC_VOLUME)
		av->used_ebs = used_ebs;
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	dbg_bld("found volume (ID %i)", vol_id);
	return av;
}

/**
 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
 * from it's original list.
 * @ai: ubi_attach_info object
 * @aeb: the to be assigned SEB
 * @av: target scan volume
 */
static void assign_aeb_to_av(struct ubi_attach_info *ai,
			     struct ubi_ainf_peb *aeb,
			     struct ubi_ainf_volume *av)
{
	struct ubi_ainf_peb *tmp_aeb;
	struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;

	p = &av->root.rb_node;
	while (*p) {
		parent = *p;

		tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
		if (aeb->lnum != tmp_aeb->lnum) {
			if (aeb->lnum < tmp_aeb->lnum)
				p = &(*p)->rb_left;
			else
				p = &(*p)->rb_right;

			continue;
		} else
			break;
	}

	list_del(&aeb->u.list);
	av->leb_count++;

	rb_link_node(&aeb->u.rb, parent, p);
	rb_insert_color(&aeb->u.rb, &av->root);
}

/**
 * update_vol - inserts or updates a LEB which was found a pool.
 * @ubi: the UBI device object
 * @ai: attach info object
 * @av: the volume this LEB belongs to
 * @new_vh: the volume header derived from new_aeb
 * @new_aeb: the AEB to be examined
 *
 * Returns 0 on success, < 0 indicates an internal error.
 */
static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
		      struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
		      struct ubi_ainf_peb *new_aeb)
{
	struct rb_node **p = &av->root.rb_node, *parent = NULL;
	struct ubi_ainf_peb *aeb, *victim;
	int cmp_res;

	while (*p) {
		parent = *p;
		aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);

		if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
			if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
				p = &(*p)->rb_left;
			else
				p = &(*p)->rb_right;

			continue;
		}

		/* This case can happen if the fastmap gets written
		 * because of a volume change (creation, deletion, ..).
		 * Then a PEB can be within the persistent EBA and the pool.
		 */
		if (aeb->pnum == new_aeb->pnum) {
			ubi_assert(aeb->lnum == new_aeb->lnum);
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			ubi_free_aeb(ai, new_aeb);
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			return 0;
		}

		cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
		if (cmp_res < 0)
			return cmp_res;

		/* new_aeb is newer */
		if (cmp_res & 1) {
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			victim = ubi_alloc_aeb(ai, aeb->pnum, aeb->ec);
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			if (!victim)
				return -ENOMEM;

			list_add_tail(&victim->u.list, &ai->erase);

			if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
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				av->last_data_size =
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					be32_to_cpu(new_vh->data_size);

			dbg_bld("vol %i: AEB %i's PEB %i is the newer",
				av->vol_id, aeb->lnum, new_aeb->pnum);

			aeb->ec = new_aeb->ec;
			aeb->pnum = new_aeb->pnum;
			aeb->copy_flag = new_vh->copy_flag;
			aeb->scrub = new_aeb->scrub;
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			aeb->sqnum = new_aeb->sqnum;
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			ubi_free_aeb(ai, new_aeb);
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		/* new_aeb is older */
		} else {
			dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
				av->vol_id, aeb->lnum, new_aeb->pnum);
			list_add_tail(&new_aeb->u.list, &ai->erase);
		}

		return 0;
	}
	/* This LEB is new, let's add it to the volume */

	if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
		av->highest_lnum = be32_to_cpu(new_vh->lnum);
		av->last_data_size = be32_to_cpu(new_vh->data_size);
	}

	if (av->vol_type == UBI_STATIC_VOLUME)
		av->used_ebs = be32_to_cpu(new_vh->used_ebs);

	av->leb_count++;

	rb_link_node(&new_aeb->u.rb, parent, p);
	rb_insert_color(&new_aeb->u.rb, &av->root);

	return 0;
}

/**
 * process_pool_aeb - we found a non-empty PEB in a pool.
 * @ubi: UBI device object
 * @ai: attach info object
 * @new_vh: the volume header derived from new_aeb
 * @new_aeb: the AEB to be examined
 *
 * Returns 0 on success, < 0 indicates an internal error.
 */
static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
			    struct ubi_vid_hdr *new_vh,
			    struct ubi_ainf_peb *new_aeb)
{
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	int vol_id = be32_to_cpu(new_vh->vol_id);
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	struct ubi_ainf_volume *av;
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	if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) {
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		ubi_free_aeb(ai, new_aeb);
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		return 0;
	}

	/* Find the volume this SEB belongs to */
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	av = ubi_find_av(ai, vol_id);
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	if (!av) {
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		ubi_err(ubi, "orphaned volume in fastmap pool!");
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		ubi_free_aeb(ai, new_aeb);
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		return UBI_BAD_FASTMAP;
	}

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	ubi_assert(vol_id == av->vol_id);
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	return update_vol(ubi, ai, av, new_vh, new_aeb);
}

/**
 * unmap_peb - unmap a PEB.
 * If fastmap detects a free PEB in the pool it has to check whether
 * this PEB has been unmapped after writing the fastmap.
 *
 * @ai: UBI attach info object
 * @pnum: The PEB to be unmapped
 */
static void unmap_peb(struct ubi_attach_info *ai, int pnum)
{
	struct ubi_ainf_volume *av;
	struct rb_node *node, *node2;
	struct ubi_ainf_peb *aeb;

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	ubi_rb_for_each_entry(node, av, &ai->volumes, rb) {
		ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) {
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			if (aeb->pnum == pnum) {
				rb_erase(&aeb->u.rb, &av->root);
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				av->leb_count--;
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				ubi_free_aeb(ai, aeb);
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				return;
			}
		}
	}
}

/**
 * scan_pool - scans a pool for changed (no longer empty PEBs).
 * @ubi: UBI device object
 * @ai: attach info object
 * @pebs: an array of all PEB numbers in the to be scanned pool
 * @pool_size: size of the pool (number of entries in @pebs)
 * @max_sqnum: pointer to the maximal sequence number
 * @free: list of PEBs which are most likely free (and go into @ai->free)
 *
 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
 * < 0 indicates an internal error.
 */
static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
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		     __be32 *pebs, int pool_size, unsigned long long *max_sqnum,
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		     struct list_head *free)
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{
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	struct ubi_vid_io_buf *vb;
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	struct ubi_vid_hdr *vh;
	struct ubi_ec_hdr *ech;
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	struct ubi_ainf_peb *new_aeb;
	int i, pnum, err, ret = 0;
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	ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
	if (!ech)
		return -ENOMEM;

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	vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
	if (!vb) {
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		kfree(ech);
		return -ENOMEM;
	}

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	vh = ubi_get_vid_hdr(vb);

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	dbg_bld("scanning fastmap pool: size = %i", pool_size);

	/*
	 * Now scan all PEBs in the pool to find changes which have been made
	 * after the creation of the fastmap
	 */
	for (i = 0; i < pool_size; i++) {
		int scrub = 0;
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		int image_seq;
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		pnum = be32_to_cpu(pebs[i]);

		if (ubi_io_is_bad(ubi, pnum)) {
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			ubi_err(ubi, "bad PEB in fastmap pool!");
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			ret = UBI_BAD_FASTMAP;
			goto out;
		}

		err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
		if (err && err != UBI_IO_BITFLIPS) {
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			ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
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				pnum, err);
			ret = err > 0 ? UBI_BAD_FASTMAP : err;
			goto out;
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		} else if (err == UBI_IO_BITFLIPS)
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			scrub = 1;

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		/*
		 * Older UBI implementations have image_seq set to zero, so
		 * we shouldn't fail if image_seq == 0.
		 */
		image_seq = be32_to_cpu(ech->image_seq);

		if (image_seq && (image_seq != ubi->image_seq)) {
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			ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
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				be32_to_cpu(ech->image_seq), ubi->image_seq);
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			ret = UBI_BAD_FASTMAP;
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			goto out;
		}

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		err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
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		if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
			unsigned long long ec = be64_to_cpu(ech->ec);
			unmap_peb(ai, pnum);
			dbg_bld("Adding PEB to free: %i", pnum);
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			if (err == UBI_IO_FF_BITFLIPS)
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				scrub = 1;

			add_aeb(ai, free, pnum, ec, scrub);
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			continue;
		} else if (err == 0 || err == UBI_IO_BITFLIPS) {
			dbg_bld("Found non empty PEB:%i in pool", pnum);

			if (err == UBI_IO_BITFLIPS)
				scrub = 1;

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			new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec));
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			if (!new_aeb) {
				ret = -ENOMEM;
				goto out;
			}

			new_aeb->lnum = be32_to_cpu(vh->lnum);
			new_aeb->sqnum = be64_to_cpu(vh->sqnum);
			new_aeb->copy_flag = vh->copy_flag;
			new_aeb->scrub = scrub;

			if (*max_sqnum < new_aeb->sqnum)
				*max_sqnum = new_aeb->sqnum;

			err = process_pool_aeb(ubi, ai, vh, new_aeb);
			if (err) {
				ret = err > 0 ? UBI_BAD_FASTMAP : err;
				goto out;
			}
		} else {
			/* We are paranoid and fall back to scanning mode */
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			ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
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			ret = err > 0 ? UBI_BAD_FASTMAP : err;
			goto out;
		}

	}

out:
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	ubi_free_vid_buf(vb);
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	kfree(ech);
	return ret;
}

/**
 * count_fastmap_pebs - Counts the PEBs found by fastmap.
 * @ai: The UBI attach info object
 */
static int count_fastmap_pebs(struct ubi_attach_info *ai)
{
	struct ubi_ainf_peb *aeb;
	struct ubi_ainf_volume *av;
	struct rb_node *rb1, *rb2;
	int n = 0;

	list_for_each_entry(aeb, &ai->erase, u.list)
		n++;

	list_for_each_entry(aeb, &ai->free, u.list)
		n++;

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	ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
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		ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
			n++;

	return n;
}

/**
 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
 * @ubi: UBI device object
 * @ai: UBI attach info object
 * @fm: the fastmap to be attached
 *
 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
 * < 0 indicates an internal error.
 */
static int ubi_attach_fastmap(struct ubi_device *ubi,
			      struct ubi_attach_info *ai,
			      struct ubi_fastmap_layout *fm)
{
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	struct list_head used, free;
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	struct ubi_ainf_volume *av;
	struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
	struct ubi_fm_sb *fmsb;
	struct ubi_fm_hdr *fmhdr;
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	struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
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	struct ubi_fm_ec *fmec;
	struct ubi_fm_volhdr *fmvhdr;
	struct ubi_fm_eba *fm_eba;
	int ret, i, j, pool_size, wl_pool_size;
	size_t fm_pos = 0, fm_size = ubi->fm_size;
	unsigned long long max_sqnum = 0;
	void *fm_raw = ubi->fm_buf;

	INIT_LIST_HEAD(&used);
	INIT_LIST_HEAD(&free);
	ai->min_ec = UBI_MAX_ERASECOUNTER;

	fmsb = (struct ubi_fm_sb *)(fm_raw);
	ai->max_sqnum = fmsb->sqnum;
	fm_pos += sizeof(struct ubi_fm_sb);
	if (fm_pos >= fm_size)
		goto fail_bad;

	fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmhdr);
	if (fm_pos >= fm_size)
		goto fail_bad;

	if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
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		ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
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591 592 593 594
			be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
		goto fail_bad;
	}

595 596
	fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl);
R
Richard Weinberger 已提交
597 598
	if (fm_pos >= fm_size)
		goto fail_bad;
599
	if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
600
		ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
601
			be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
R
Richard Weinberger 已提交
602 603 604
		goto fail_bad;
	}

605 606
	fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl_wl);
R
Richard Weinberger 已提交
607 608
	if (fm_pos >= fm_size)
		goto fail_bad;
609 610 611
	if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
		ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
			be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
R
Richard Weinberger 已提交
612 613 614
		goto fail_bad;
	}

615 616 617 618
	pool_size = be16_to_cpu(fmpl->size);
	wl_pool_size = be16_to_cpu(fmpl_wl->size);
	fm->max_pool_size = be16_to_cpu(fmpl->max_size);
	fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
R
Richard Weinberger 已提交
619 620

	if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
621
		ubi_err(ubi, "bad pool size: %i", pool_size);
R
Richard Weinberger 已提交
622 623 624 625
		goto fail_bad;
	}

	if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
626
		ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
R
Richard Weinberger 已提交
627 628 629 630 631 632
		goto fail_bad;
	}


	if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
	    fm->max_pool_size < 0) {
633
		ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
R
Richard Weinberger 已提交
634 635 636 637 638
		goto fail_bad;
	}

	if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
	    fm->max_wl_pool_size < 0) {
639 640
		ubi_err(ubi, "bad maximal WL pool size: %i",
			fm->max_wl_pool_size);
R
Richard Weinberger 已提交
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
		goto fail_bad;
	}

	/* read EC values from free list */
	for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;

		add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
			be32_to_cpu(fmec->ec), 0);
	}

	/* read EC values from used list */
	for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;

		add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
			be32_to_cpu(fmec->ec), 0);
	}

	/* read EC values from scrub list */
	for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;

		add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
			be32_to_cpu(fmec->ec), 1);
	}

	/* read EC values from erase list */
	for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;

		add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
			be32_to_cpu(fmec->ec), 1);
	}

	ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
	ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);

	/* Iterate over all volumes and read their EBA table */
	for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
		fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmvhdr);
		if (fm_pos >= fm_size)
			goto fail_bad;

		if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
699
			ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
R
Richard Weinberger 已提交
700 701 702 703 704 705 706 707 708 709
				be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
			goto fail_bad;
		}

		av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
			     be32_to_cpu(fmvhdr->used_ebs),
			     be32_to_cpu(fmvhdr->data_pad),
			     fmvhdr->vol_type,
			     be32_to_cpu(fmvhdr->last_eb_bytes));

710 711 712 713 714
		if (IS_ERR(av)) {
			if (PTR_ERR(av) == -EEXIST)
				ubi_err(ubi, "volume (ID %i) already exists",
					fmvhdr->vol_id);

715 716
			goto fail_bad;
		}
R
Richard Weinberger 已提交
717 718 719 720 721 722 723 724 725 726 727 728

		ai->vols_found++;
		if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
			ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);

		fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fm_eba);
		fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
		if (fm_pos >= fm_size)
			goto fail_bad;

		if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
729
			ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
R
Richard Weinberger 已提交
730 731 732 733 734 735 736
				be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
			goto fail_bad;
		}

		for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
			int pnum = be32_to_cpu(fm_eba->pnum[j]);

737
			if (pnum < 0)
R
Richard Weinberger 已提交
738 739 740 741
				continue;

			aeb = NULL;
			list_for_each_entry(tmp_aeb, &used, u.list) {
742
				if (tmp_aeb->pnum == pnum) {
R
Richard Weinberger 已提交
743
					aeb = tmp_aeb;
744 745
					break;
				}
R
Richard Weinberger 已提交
746 747 748
			}

			if (!aeb) {
749 750
				ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
				goto fail_bad;
R
Richard Weinberger 已提交
751 752 753 754 755 756 757 758 759 760 761 762 763 764
			}

			aeb->lnum = j;

			if (av->highest_lnum <= aeb->lnum)
				av->highest_lnum = aeb->lnum;

			assign_aeb_to_av(ai, aeb, av);

			dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
				aeb->pnum, aeb->lnum, av->vol_id);
		}
	}

765
	ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
R
Richard Weinberger 已提交
766 767 768
	if (ret)
		goto fail;

769
	ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
R
Richard Weinberger 已提交
770 771 772 773 774 775
	if (ret)
		goto fail;

	if (max_sqnum > ai->max_sqnum)
		ai->max_sqnum = max_sqnum;

776 777
	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
		list_move_tail(&tmp_aeb->u.list, &ai->free);
R
Richard Weinberger 已提交
778

779 780 781
	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
		list_move_tail(&tmp_aeb->u.list, &ai->erase);

782 783
	ubi_assert(list_empty(&free));

R
Richard Weinberger 已提交
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798
	/*
	 * If fastmap is leaking PEBs (must not happen), raise a
	 * fat warning and fall back to scanning mode.
	 * We do this here because in ubi_wl_init() it's too late
	 * and we cannot fall back to scanning.
	 */
	if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
		    ai->bad_peb_count - fm->used_blocks))
		goto fail_bad;

	return 0;

fail_bad:
	ret = UBI_BAD_FASTMAP;
fail:
799 800
	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
		list_del(&tmp_aeb->u.list);
801
		ubi_free_aeb(ai, tmp_aeb);
802 803 804
	}
	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
		list_del(&tmp_aeb->u.list);
805
		ubi_free_aeb(ai, tmp_aeb);
806 807
	}

R
Richard Weinberger 已提交
808 809 810
	return ret;
}

811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
/**
 * find_fm_anchor - find the most recent Fastmap superblock (anchor)
 * @ai: UBI attach info to be filled
 */
static int find_fm_anchor(struct ubi_attach_info *ai)
{
	int ret = -1;
	struct ubi_ainf_peb *aeb;
	unsigned long long max_sqnum = 0;

	list_for_each_entry(aeb, &ai->fastmap, u.list) {
		if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) {
			max_sqnum = aeb->sqnum;
			ret = aeb->pnum;
		}
	}

	return ret;
}

831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
static struct ubi_ainf_peb *clone_aeb(struct ubi_attach_info *ai,
				      struct ubi_ainf_peb *old)
{
	struct ubi_ainf_peb *new;

	new = ubi_alloc_aeb(ai, old->pnum, old->ec);
	if (!new)
		return NULL;

	new->vol_id = old->vol_id;
	new->sqnum = old->sqnum;
	new->lnum = old->lnum;
	new->scrub = old->scrub;
	new->copy_flag = old->copy_flag;

	return new;
}

R
Richard Weinberger 已提交
849 850 851 852
/**
 * ubi_scan_fastmap - scan the fastmap.
 * @ubi: UBI device object
 * @ai: UBI attach info to be filled
853 854
 * @scan_ai: UBI attach info from the first 64 PEBs,
 *           used to find the most recent Fastmap data structure
R
Richard Weinberger 已提交
855 856 857 858 859 860
 *
 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
 * UBI_BAD_FASTMAP if one was found but is not usable.
 * < 0 indicates an internal error.
 */
int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
861
		     struct ubi_attach_info *scan_ai)
R
Richard Weinberger 已提交
862 863
{
	struct ubi_fm_sb *fmsb, *fmsb2;
864
	struct ubi_vid_io_buf *vb;
R
Richard Weinberger 已提交
865 866 867
	struct ubi_vid_hdr *vh;
	struct ubi_ec_hdr *ech;
	struct ubi_fastmap_layout *fm;
868
	struct ubi_ainf_peb *aeb;
869
	int i, used_blocks, pnum, fm_anchor, ret = 0;
R
Richard Weinberger 已提交
870 871 872 873
	size_t fm_size;
	__be32 crc, tmp_crc;
	unsigned long long sqnum = 0;

874 875 876 877
	fm_anchor = find_fm_anchor(scan_ai);
	if (fm_anchor < 0)
		return UBI_NO_FASTMAP;

878 879 880 881 882 883 884 885 886 887
	/* Copy all (possible) fastmap blocks into our new attach structure. */
	list_for_each_entry(aeb, &scan_ai->fastmap, u.list) {
		struct ubi_ainf_peb *new;

		new = clone_aeb(ai, aeb);
		if (!new)
			return -ENOMEM;

		list_add(&new->u.list, &ai->fastmap);
	}
888

889
	down_write(&ubi->fm_protect);
R
Richard Weinberger 已提交
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
	memset(ubi->fm_buf, 0, ubi->fm_size);

	fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
	if (!fmsb) {
		ret = -ENOMEM;
		goto out;
	}

	fm = kzalloc(sizeof(*fm), GFP_KERNEL);
	if (!fm) {
		ret = -ENOMEM;
		kfree(fmsb);
		goto out;
	}

905
	ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb));
R
Richard Weinberger 已提交
906 907 908 909 910 911
	if (ret && ret != UBI_IO_BITFLIPS)
		goto free_fm_sb;
	else if (ret == UBI_IO_BITFLIPS)
		fm->to_be_tortured[0] = 1;

	if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
912
		ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
R
Richard Weinberger 已提交
913 914 915 916 917 918
			be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	if (fmsb->version != UBI_FM_FMT_VERSION) {
919
		ubi_err(ubi, "bad fastmap version: %i, expected: %i",
R
Richard Weinberger 已提交
920 921 922 923 924 925 926
			fmsb->version, UBI_FM_FMT_VERSION);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	used_blocks = be32_to_cpu(fmsb->used_blocks);
	if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
927 928
		ubi_err(ubi, "number of fastmap blocks is invalid: %i",
			used_blocks);
R
Richard Weinberger 已提交
929 930 931 932 933 934
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	fm_size = ubi->leb_size * used_blocks;
	if (fm_size != ubi->fm_size) {
935 936
		ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
			fm_size, ubi->fm_size);
R
Richard Weinberger 已提交
937 938 939 940 941 942 943 944 945 946
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
	if (!ech) {
		ret = -ENOMEM;
		goto free_fm_sb;
	}

947 948
	vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
	if (!vb) {
R
Richard Weinberger 已提交
949 950 951 952
		ret = -ENOMEM;
		goto free_hdr;
	}

953 954
	vh = ubi_get_vid_hdr(vb);

R
Richard Weinberger 已提交
955
	for (i = 0; i < used_blocks; i++) {
956 957
		int image_seq;

R
Richard Weinberger 已提交
958 959 960 961 962 963 964
		pnum = be32_to_cpu(fmsb->block_loc[i]);

		if (ubi_io_is_bad(ubi, pnum)) {
			ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		}

965 966 967 968 969 970 971
		if (i == 0 && pnum != fm_anchor) {
			ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
				pnum, fm_anchor);
			ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		}

R
Richard Weinberger 已提交
972 973
		ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
		if (ret && ret != UBI_IO_BITFLIPS) {
974
			ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
R
Richard Weinberger 已提交
975 976 977 978 979 980 981
				i, pnum);
			if (ret > 0)
				ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		} else if (ret == UBI_IO_BITFLIPS)
			fm->to_be_tortured[i] = 1;

982
		image_seq = be32_to_cpu(ech->image_seq);
R
Richard Weinberger 已提交
983
		if (!ubi->image_seq)
984
			ubi->image_seq = image_seq;
R
Richard Weinberger 已提交
985

986 987 988 989 990
		/*
		 * Older UBI implementations have image_seq set to zero, so
		 * we shouldn't fail if image_seq == 0.
		 */
		if (image_seq && (image_seq != ubi->image_seq)) {
991
			ubi_err(ubi, "wrong image seq:%d instead of %d",
992
				be32_to_cpu(ech->image_seq), ubi->image_seq);
R
Richard Weinberger 已提交
993 994 995 996
			ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		}

997
		ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
R
Richard Weinberger 已提交
998
		if (ret && ret != UBI_IO_BITFLIPS) {
999
			ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
R
Richard Weinberger 已提交
1000 1001 1002 1003 1004 1005
				i, pnum);
			goto free_hdr;
		}

		if (i == 0) {
			if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
1006
				ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
R
Richard Weinberger 已提交
1007 1008 1009 1010 1011 1012 1013
					be32_to_cpu(vh->vol_id),
					UBI_FM_SB_VOLUME_ID);
				ret = UBI_BAD_FASTMAP;
				goto free_hdr;
			}
		} else {
			if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
1014
				ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
R
Richard Weinberger 已提交
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
					be32_to_cpu(vh->vol_id),
					UBI_FM_DATA_VOLUME_ID);
				ret = UBI_BAD_FASTMAP;
				goto free_hdr;
			}
		}

		if (sqnum < be64_to_cpu(vh->sqnum))
			sqnum = be64_to_cpu(vh->sqnum);

1025 1026
		ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i),
				       pnum, 0, ubi->leb_size);
R
Richard Weinberger 已提交
1027
		if (ret && ret != UBI_IO_BITFLIPS) {
1028
			ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
R
Richard Weinberger 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
				"err: %i)", i, pnum, ret);
			goto free_hdr;
		}
	}

	kfree(fmsb);
	fmsb = NULL;

	fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
	tmp_crc = be32_to_cpu(fmsb2->data_crc);
	fmsb2->data_crc = 0;
	crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
	if (crc != tmp_crc) {
1042 1043 1044
		ubi_err(ubi, "fastmap data CRC is invalid");
		ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
			tmp_crc, crc);
R
Richard Weinberger 已提交
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
		ret = UBI_BAD_FASTMAP;
		goto free_hdr;
	}

	fmsb2->sqnum = sqnum;

	fm->used_blocks = used_blocks;

	ret = ubi_attach_fastmap(ubi, ai, fm);
	if (ret) {
		if (ret > 0)
			ret = UBI_BAD_FASTMAP;
		goto free_hdr;
	}

	for (i = 0; i < used_blocks; i++) {
		struct ubi_wl_entry *e;

		e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
		if (!e) {
			while (i--)
				kfree(fm->e[i]);

			ret = -ENOMEM;
			goto free_hdr;
		}

		e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
		e->ec = be32_to_cpu(fmsb2->block_ec[i]);
		fm->e[i] = e;
	}

	ubi->fm = fm;
	ubi->fm_pool.max_size = ubi->fm->max_pool_size;
	ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
1080 1081 1082 1083
	ubi_msg(ubi, "attached by fastmap");
	ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
	ubi_msg(ubi, "fastmap WL pool size: %d",
		ubi->fm_wl_pool.max_size);
R
Richard Weinberger 已提交
1084
	ubi->fm_disabled = 0;
1085
	ubi->fast_attach = 1;
R
Richard Weinberger 已提交
1086

1087
	ubi_free_vid_buf(vb);
R
Richard Weinberger 已提交
1088 1089
	kfree(ech);
out:
1090
	up_write(&ubi->fm_protect);
R
Richard Weinberger 已提交
1091
	if (ret == UBI_BAD_FASTMAP)
1092
		ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
R
Richard Weinberger 已提交
1093 1094 1095
	return ret;

free_hdr:
1096
	ubi_free_vid_buf(vb);
R
Richard Weinberger 已提交
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
	kfree(ech);
free_fm_sb:
	kfree(fmsb);
	kfree(fm);
	goto out;
}

/**
 * ubi_write_fastmap - writes a fastmap.
 * @ubi: UBI device object
 * @new_fm: the to be written fastmap
 *
 * Returns 0 on success, < 0 indicates an internal error.
 */
static int ubi_write_fastmap(struct ubi_device *ubi,
			     struct ubi_fastmap_layout *new_fm)
{
	size_t fm_pos = 0;
	void *fm_raw;
	struct ubi_fm_sb *fmsb;
	struct ubi_fm_hdr *fmh;
1118
	struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
R
Richard Weinberger 已提交
1119 1120 1121 1122 1123
	struct ubi_fm_ec *fec;
	struct ubi_fm_volhdr *fvh;
	struct ubi_fm_eba *feba;
	struct ubi_wl_entry *wl_e;
	struct ubi_volume *vol;
1124
	struct ubi_vid_io_buf *avbuf, *dvbuf;
R
Richard Weinberger 已提交
1125 1126
	struct ubi_vid_hdr *avhdr, *dvhdr;
	struct ubi_work *ubi_wrk;
1127
	struct rb_node *tmp_rb;
R
Richard Weinberger 已提交
1128 1129
	int ret, i, j, free_peb_count, used_peb_count, vol_count;
	int scrub_peb_count, erase_peb_count;
1130
	unsigned long *seen_pebs = NULL;
R
Richard Weinberger 已提交
1131 1132 1133 1134

	fm_raw = ubi->fm_buf;
	memset(ubi->fm_buf, 0, ubi->fm_size);

1135 1136
	avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
	if (!avbuf) {
R
Richard Weinberger 已提交
1137 1138 1139 1140
		ret = -ENOMEM;
		goto out;
	}

1141 1142
	dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID);
	if (!dvbuf) {
R
Richard Weinberger 已提交
1143 1144 1145 1146
		ret = -ENOMEM;
		goto out_kfree;
	}

1147 1148 1149
	avhdr = ubi_get_vid_hdr(avbuf);
	dvhdr = ubi_get_vid_hdr(dvbuf);

1150 1151 1152 1153 1154 1155
	seen_pebs = init_seen(ubi);
	if (IS_ERR(seen_pebs)) {
		ret = PTR_ERR(seen_pebs);
		goto out_kfree;
	}

R
Richard Weinberger 已提交
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
	spin_lock(&ubi->volumes_lock);
	spin_lock(&ubi->wl_lock);

	fmsb = (struct ubi_fm_sb *)fm_raw;
	fm_pos += sizeof(*fmsb);
	ubi_assert(fm_pos <= ubi->fm_size);

	fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmh);
	ubi_assert(fm_pos <= ubi->fm_size);

	fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
	fmsb->version = UBI_FM_FMT_VERSION;
	fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
	/* the max sqnum will be filled in while *reading* the fastmap */
	fmsb->sqnum = 0;

	fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
	free_peb_count = 0;
	used_peb_count = 0;
	scrub_peb_count = 0;
	erase_peb_count = 0;
	vol_count = 0;

1180 1181 1182 1183 1184
	fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl);
	fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
	fmpl->size = cpu_to_be16(ubi->fm_pool.size);
	fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size);
R
Richard Weinberger 已提交
1185

1186
	for (i = 0; i < ubi->fm_pool.size; i++) {
1187
		fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1188 1189
		set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs);
	}
R
Richard Weinberger 已提交
1190

1191 1192 1193 1194 1195
	fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl_wl);
	fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
	fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size);
	fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
R
Richard Weinberger 已提交
1196

1197
	for (i = 0; i < ubi->fm_wl_pool.size; i++) {
1198
		fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1199 1200
		set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs);
	}
R
Richard Weinberger 已提交
1201

1202
	ubi_for_each_free_peb(ubi, wl_e, tmp_rb) {
R
Richard Weinberger 已提交
1203 1204 1205
		fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);

		fec->pnum = cpu_to_be32(wl_e->pnum);
1206
		set_seen(ubi, wl_e->pnum, seen_pebs);
R
Richard Weinberger 已提交
1207 1208 1209 1210 1211 1212 1213 1214
		fec->ec = cpu_to_be32(wl_e->ec);

		free_peb_count++;
		fm_pos += sizeof(*fec);
		ubi_assert(fm_pos <= ubi->fm_size);
	}
	fmh->free_peb_count = cpu_to_be32(free_peb_count);

1215
	ubi_for_each_used_peb(ubi, wl_e, tmp_rb) {
R
Richard Weinberger 已提交
1216 1217 1218
		fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);

		fec->pnum = cpu_to_be32(wl_e->pnum);
1219
		set_seen(ubi, wl_e->pnum, seen_pebs);
R
Richard Weinberger 已提交
1220 1221 1222 1223 1224 1225
		fec->ec = cpu_to_be32(wl_e->ec);

		used_peb_count++;
		fm_pos += sizeof(*fec);
		ubi_assert(fm_pos <= ubi->fm_size);
	}
1226

1227 1228
	ubi_for_each_protected_peb(ubi, i, wl_e) {
		fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1229

1230 1231 1232
		fec->pnum = cpu_to_be32(wl_e->pnum);
		set_seen(ubi, wl_e->pnum, seen_pebs);
		fec->ec = cpu_to_be32(wl_e->ec);
1233

1234 1235 1236
		used_peb_count++;
		fm_pos += sizeof(*fec);
		ubi_assert(fm_pos <= ubi->fm_size);
1237
	}
R
Richard Weinberger 已提交
1238 1239
	fmh->used_peb_count = cpu_to_be32(used_peb_count);

1240
	ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) {
R
Richard Weinberger 已提交
1241 1242 1243
		fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);

		fec->pnum = cpu_to_be32(wl_e->pnum);
1244
		set_seen(ubi, wl_e->pnum, seen_pebs);
R
Richard Weinberger 已提交
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
		fec->ec = cpu_to_be32(wl_e->ec);

		scrub_peb_count++;
		fm_pos += sizeof(*fec);
		ubi_assert(fm_pos <= ubi->fm_size);
	}
	fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);


	list_for_each_entry(ubi_wrk, &ubi->works, list) {
		if (ubi_is_erase_work(ubi_wrk)) {
			wl_e = ubi_wrk->e;
			ubi_assert(wl_e);

			fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);

			fec->pnum = cpu_to_be32(wl_e->pnum);
1262
			set_seen(ubi, wl_e->pnum, seen_pebs);
R
Richard Weinberger 已提交
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
			fec->ec = cpu_to_be32(wl_e->ec);

			erase_peb_count++;
			fm_pos += sizeof(*fec);
			ubi_assert(fm_pos <= ubi->fm_size);
		}
	}
	fmh->erase_peb_count = cpu_to_be32(erase_peb_count);

	for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
		vol = ubi->volumes[i];

		if (!vol)
			continue;

		vol_count++;

		fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fvh);
		ubi_assert(fm_pos <= ubi->fm_size);

		fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
		fvh->vol_id = cpu_to_be32(vol->vol_id);
		fvh->vol_type = vol->vol_type;
		fvh->used_ebs = cpu_to_be32(vol->used_ebs);
		fvh->data_pad = cpu_to_be32(vol->data_pad);
		fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);

		ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
			vol->vol_type == UBI_STATIC_VOLUME);

		feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
		fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
		ubi_assert(fm_pos <= ubi->fm_size);

1298 1299 1300 1301 1302 1303
		for (j = 0; j < vol->reserved_pebs; j++) {
			struct ubi_eba_leb_desc ldesc;

			ubi_eba_get_ldesc(vol, j, &ldesc);
			feba->pnum[j] = cpu_to_be32(ldesc.pnum);
		}
R
Richard Weinberger 已提交
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317

		feba->reserved_pebs = cpu_to_be32(j);
		feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
	}
	fmh->vol_count = cpu_to_be32(vol_count);
	fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);

	avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
	avhdr->lnum = 0;

	spin_unlock(&ubi->wl_lock);
	spin_unlock(&ubi->volumes_lock);

	dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1318
	ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf);
R
Richard Weinberger 已提交
1319
	if (ret) {
1320
		ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
R
Richard Weinberger 已提交
1321 1322 1323 1324 1325
		goto out_kfree;
	}

	for (i = 0; i < new_fm->used_blocks; i++) {
		fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1326
		set_seen(ubi, new_fm->e[i]->pnum, seen_pebs);
R
Richard Weinberger 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
		fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
	}

	fmsb->data_crc = 0;
	fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
					   ubi->fm_size));

	for (i = 1; i < new_fm->used_blocks; i++) {
		dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
		dvhdr->lnum = cpu_to_be32(i);
		dbg_bld("writing fastmap data to PEB %i sqnum %llu",
			new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1339
		ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf);
R
Richard Weinberger 已提交
1340
		if (ret) {
1341
			ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
R
Richard Weinberger 已提交
1342 1343 1344 1345 1346 1347
				new_fm->e[i]->pnum);
			goto out_kfree;
		}
	}

	for (i = 0; i < new_fm->used_blocks; i++) {
1348 1349
		ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size),
					new_fm->e[i]->pnum, 0, ubi->leb_size);
R
Richard Weinberger 已提交
1350
		if (ret) {
1351
			ubi_err(ubi, "unable to write fastmap to PEB %i!",
R
Richard Weinberger 已提交
1352 1353 1354 1355 1356 1357 1358 1359
				new_fm->e[i]->pnum);
			goto out_kfree;
		}
	}

	ubi_assert(new_fm);
	ubi->fm = new_fm;

1360
	ret = self_check_seen(ubi, seen_pebs);
R
Richard Weinberger 已提交
1361 1362 1363
	dbg_bld("fastmap written!");

out_kfree:
1364 1365
	ubi_free_vid_buf(avbuf);
	ubi_free_vid_buf(dvbuf);
1366
	free_seen(seen_pebs);
R
Richard Weinberger 已提交
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
out:
	return ret;
}

/**
 * erase_block - Manually erase a PEB.
 * @ubi: UBI device object
 * @pnum: PEB to be erased
 *
 * Returns the new EC value on success, < 0 indicates an internal error.
 */
static int erase_block(struct ubi_device *ubi, int pnum)
{
	int ret;
	struct ubi_ec_hdr *ec_hdr;
	long long ec;

	ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
	if (!ec_hdr)
		return -ENOMEM;

	ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
	if (ret < 0)
		goto out;
	else if (ret && ret != UBI_IO_BITFLIPS) {
		ret = -EINVAL;
		goto out;
	}

	ret = ubi_io_sync_erase(ubi, pnum, 0);
	if (ret < 0)
		goto out;

	ec = be64_to_cpu(ec_hdr->ec);
	ec += ret;
	if (ec > UBI_MAX_ERASECOUNTER) {
		ret = -EINVAL;
		goto out;
	}

	ec_hdr->ec = cpu_to_be64(ec);
	ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
	if (ret < 0)
		goto out;

	ret = ec;
out:
	kfree(ec_hdr);
	return ret;
}

/**
 * invalidate_fastmap - destroys a fastmap.
 * @ubi: UBI device object
 *
1422 1423 1424 1425 1426 1427
 * This function ensures that upon next UBI attach a full scan
 * is issued. We need this if UBI is about to write a new fastmap
 * but is unable to do so. In this case we have two options:
 * a) Make sure that the current fastmap will not be usued upon
 * attach time and contine or b) fall back to RO mode to have the
 * current fastmap in a valid state.
R
Richard Weinberger 已提交
1428 1429
 * Returns 0 on success, < 0 indicates an internal error.
 */
1430
static int invalidate_fastmap(struct ubi_device *ubi)
R
Richard Weinberger 已提交
1431
{
1432
	int ret;
1433 1434
	struct ubi_fastmap_layout *fm;
	struct ubi_wl_entry *e;
1435 1436
	struct ubi_vid_io_buf *vb = NULL;
	struct ubi_vid_hdr *vh;
R
Richard Weinberger 已提交
1437

1438 1439 1440 1441 1442 1443 1444 1445 1446
	if (!ubi->fm)
		return 0;

	ubi->fm = NULL;

	ret = -ENOMEM;
	fm = kzalloc(sizeof(*fm), GFP_KERNEL);
	if (!fm)
		goto out;
R
Richard Weinberger 已提交
1447

1448 1449
	vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
	if (!vb)
1450 1451
		goto out_free_fm;

1452 1453
	vh = ubi_get_vid_hdr(vb);

1454 1455 1456 1457
	ret = -ENOSPC;
	e = ubi_wl_get_fm_peb(ubi, 1);
	if (!e)
		goto out_free_fm;
R
Richard Weinberger 已提交
1458

1459 1460 1461 1462
	/*
	 * Create fake fastmap such that UBI will fall back
	 * to scanning mode.
	 */
R
Richard Weinberger 已提交
1463
	vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1464
	ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb);
1465 1466 1467 1468
	if (ret < 0) {
		ubi_wl_put_fm_peb(ubi, e, 0, 0);
		goto out_free_fm;
	}
R
Richard Weinberger 已提交
1469

1470 1471 1472 1473 1474 1475
	fm->used_blocks = 1;
	fm->e[0] = e;

	ubi->fm = fm;

out:
1476
	ubi_free_vid_buf(vb);
R
Richard Weinberger 已提交
1477
	return ret;
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504

out_free_fm:
	kfree(fm);
	goto out;
}

/**
 * return_fm_pebs - returns all PEBs used by a fastmap back to the
 * WL sub-system.
 * @ubi: UBI device object
 * @fm: fastmap layout object
 */
static void return_fm_pebs(struct ubi_device *ubi,
			   struct ubi_fastmap_layout *fm)
{
	int i;

	if (!fm)
		return;

	for (i = 0; i < fm->used_blocks; i++) {
		if (fm->e[i]) {
			ubi_wl_put_fm_peb(ubi, fm->e[i], i,
					  fm->to_be_tortured[i]);
			fm->e[i] = NULL;
		}
	}
R
Richard Weinberger 已提交
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
}

/**
 * ubi_update_fastmap - will be called by UBI if a volume changes or
 * a fastmap pool becomes full.
 * @ubi: UBI device object
 *
 * Returns 0 on success, < 0 indicates an internal error.
 */
int ubi_update_fastmap(struct ubi_device *ubi)
{
1516
	int ret, i, j;
R
Richard Weinberger 已提交
1517 1518 1519
	struct ubi_fastmap_layout *new_fm, *old_fm;
	struct ubi_wl_entry *tmp_e;

1520
	down_write(&ubi->fm_protect);
1521 1522
	down_write(&ubi->work_sem);
	down_write(&ubi->fm_eba_sem);
R
Richard Weinberger 已提交
1523 1524 1525 1526

	ubi_refill_pools(ubi);

	if (ubi->ro_mode || ubi->fm_disabled) {
1527 1528
		up_write(&ubi->fm_eba_sem);
		up_write(&ubi->work_sem);
1529
		up_write(&ubi->fm_protect);
R
Richard Weinberger 已提交
1530 1531 1532 1533 1534
		return 0;
	}

	ret = ubi_ensure_anchor_pebs(ubi);
	if (ret) {
1535 1536
		up_write(&ubi->fm_eba_sem);
		up_write(&ubi->work_sem);
1537
		up_write(&ubi->fm_protect);
R
Richard Weinberger 已提交
1538 1539 1540 1541 1542
		return ret;
	}

	new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
	if (!new_fm) {
1543 1544
		up_write(&ubi->fm_eba_sem);
		up_write(&ubi->work_sem);
1545
		up_write(&ubi->fm_protect);
R
Richard Weinberger 已提交
1546 1547 1548 1549 1550 1551 1552 1553
		return -ENOMEM;
	}

	new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
	old_fm = ubi->fm;
	ubi->fm = NULL;

	if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1554
		ubi_err(ubi, "fastmap too large");
R
Richard Weinberger 已提交
1555 1556 1557 1558 1559 1560 1561 1562 1563
		ret = -ENOSPC;
		goto err;
	}

	for (i = 1; i < new_fm->used_blocks; i++) {
		spin_lock(&ubi->wl_lock);
		tmp_e = ubi_wl_get_fm_peb(ubi, 0);
		spin_unlock(&ubi->wl_lock);

1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
		if (!tmp_e) {
			if (old_fm && old_fm->e[i]) {
				ret = erase_block(ubi, old_fm->e[i]->pnum);
				if (ret < 0) {
					ubi_err(ubi, "could not erase old fastmap PEB");

					for (j = 1; j < i; j++) {
						ubi_wl_put_fm_peb(ubi, new_fm->e[j],
								  j, 0);
						new_fm->e[j] = NULL;
					}
					goto err;
				}
				new_fm->e[i] = old_fm->e[i];
				old_fm->e[i] = NULL;
			} else {
				ubi_err(ubi, "could not get any free erase block");

				for (j = 1; j < i; j++) {
					ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
					new_fm->e[j] = NULL;
				}
R
Richard Weinberger 已提交
1586

1587
				ret = -ENOSPC;
R
Richard Weinberger 已提交
1588 1589 1590
				goto err;
			}
		} else {
1591
			new_fm->e[i] = tmp_e;
R
Richard Weinberger 已提交
1592

1593
			if (old_fm && old_fm->e[i]) {
R
Richard Weinberger 已提交
1594 1595
				ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
						  old_fm->to_be_tortured[i]);
1596 1597
				old_fm->e[i] = NULL;
			}
R
Richard Weinberger 已提交
1598 1599 1600
		}
	}

1601 1602 1603 1604 1605
	/* Old fastmap is larger than the new one */
	if (old_fm && new_fm->used_blocks < old_fm->used_blocks) {
		for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) {
			ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
					  old_fm->to_be_tortured[i]);
1606
			old_fm->e[i] = NULL;
1607 1608 1609
		}
	}

R
Richard Weinberger 已提交
1610 1611 1612 1613 1614 1615 1616 1617 1618
	spin_lock(&ubi->wl_lock);
	tmp_e = ubi_wl_get_fm_peb(ubi, 1);
	spin_unlock(&ubi->wl_lock);

	if (old_fm) {
		/* no fresh anchor PEB was found, reuse the old one */
		if (!tmp_e) {
			ret = erase_block(ubi, old_fm->e[0]->pnum);
			if (ret < 0) {
1619
				ubi_err(ubi, "could not erase old anchor PEB");
R
Richard Weinberger 已提交
1620

1621
				for (i = 1; i < new_fm->used_blocks; i++) {
R
Richard Weinberger 已提交
1622 1623
					ubi_wl_put_fm_peb(ubi, new_fm->e[i],
							  i, 0);
1624 1625
					new_fm->e[i] = NULL;
				}
R
Richard Weinberger 已提交
1626 1627
				goto err;
			}
1628
			new_fm->e[0] = old_fm->e[0];
R
Richard Weinberger 已提交
1629
			new_fm->e[0]->ec = ret;
1630
			old_fm->e[0] = NULL;
R
Richard Weinberger 已提交
1631 1632 1633 1634
		} else {
			/* we've got a new anchor PEB, return the old one */
			ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
					  old_fm->to_be_tortured[0]);
1635
			new_fm->e[0] = tmp_e;
1636
			old_fm->e[0] = NULL;
R
Richard Weinberger 已提交
1637 1638 1639
		}
	} else {
		if (!tmp_e) {
1640
			ubi_err(ubi, "could not find any anchor PEB");
R
Richard Weinberger 已提交
1641

1642
			for (i = 1; i < new_fm->used_blocks; i++) {
R
Richard Weinberger 已提交
1643
				ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1644 1645
				new_fm->e[i] = NULL;
			}
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Richard Weinberger 已提交
1646 1647 1648 1649

			ret = -ENOSPC;
			goto err;
		}
1650
		new_fm->e[0] = tmp_e;
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1651 1652 1653 1654 1655 1656 1657 1658
	}

	ret = ubi_write_fastmap(ubi, new_fm);

	if (ret)
		goto err;

out_unlock:
1659 1660
	up_write(&ubi->fm_eba_sem);
	up_write(&ubi->work_sem);
1661
	up_write(&ubi->fm_protect);
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Richard Weinberger 已提交
1662 1663 1664 1665
	kfree(old_fm);
	return ret;

err:
1666
	ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
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Richard Weinberger 已提交
1667

1668 1669
	ret = invalidate_fastmap(ubi);
	if (ret < 0) {
1670
		ubi_err(ubi, "Unable to invalidate current fastmap!");
1671 1672 1673 1674 1675
		ubi_ro_mode(ubi);
	} else {
		return_fm_pebs(ubi, old_fm);
		return_fm_pebs(ubi, new_fm);
		ret = 0;
R
Richard Weinberger 已提交
1676
	}
1677 1678

	kfree(new_fm);
R
Richard Weinberger 已提交
1679 1680
	goto out_unlock;
}