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/*
* Copyright (c) International Business Machines Corp., 2006
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Artem Bityutskiy (Битюцкий Артём)
*/
#ifndef __UBI_SCAN_H__
#define __UBI_SCAN_H__
/* The erase counter value for this physical eraseblock is unknown */
#define UBI_SCAN_UNKNOWN_EC (-1)
/**
* struct ubi_scan_leb - scanning information about a physical eraseblock.
* @ec: erase counter (%UBI_SCAN_UNKNOWN_EC if it is unknown)
* @pnum: physical eraseblock number
* @lnum: logical eraseblock number
* @scrub: if this physical eraseblock needs scrubbing
* @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB)
* @sqnum: sequence number
* @u: unions RB-tree or @list links
* @u.rb: link in the per-volume RB-tree of &struct ubi_scan_leb objects
* @u.list: link in one of the eraseblock lists
*
* One object of this type is allocated for each physical eraseblock during
* scanning.
*/
struct ubi_scan_leb {
int ec;
int pnum;
int lnum;
unsigned int scrub:1;
unsigned int copy_flag:1;
unsigned long long sqnum;
union {
struct rb_node rb;
struct list_head list;
} u;
};
/**
* struct ubi_scan_volume - scanning information about a volume.
* @vol_id: volume ID
* @highest_lnum: highest logical eraseblock number in this volume
* @leb_count: number of logical eraseblocks in this volume
* @vol_type: volume type
* @used_ebs: number of used logical eraseblocks in this volume (only for
* static volumes)
* @last_data_size: amount of data in the last logical eraseblock of this
* volume (always equivalent to the usable logical eraseblock
* size in case of dynamic volumes)
* @data_pad: how many bytes at the end of logical eraseblocks of this volume
* are not used (due to volume alignment)
* @compat: compatibility flags of this volume
* @rb: link in the volume RB-tree
* @root: root of the RB-tree containing all the eraseblock belonging to this
* volume (&struct ubi_scan_leb objects)
*
* One object of this type is allocated for each volume during scanning.
*/
struct ubi_scan_volume {
int vol_id;
int highest_lnum;
int leb_count;
int vol_type;
int used_ebs;
int last_data_size;
int data_pad;
int compat;
struct rb_node rb;
struct rb_root root;
};
/**
* struct ubi_scan_info - UBI scanning information.
* @volumes: root of the volume RB-tree
* @corr: list of corrupted physical eraseblocks
* @free: list of free physical eraseblocks
* @erase: list of physical eraseblocks which have to be erased
* @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
* those belonging to "preserve"-compatible internal volumes)
* @corr_peb_count: count of PEBs in the @corr list
* @empty_peb_count: count of PEBs which are presumably empty (contain only
* 0xFF bytes)
* @alien_peb_count: count of PEBs in the @alien list
* @bad_peb_count: count of bad physical eraseblocks
* @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked
* as bad yet, but which look like bad
* @vols_found: number of volumes found during scanning
* @highest_vol_id: highest volume ID
* @is_empty: flag indicating whether the MTD device is empty or not
* @min_ec: lowest erase counter value
* @max_ec: highest erase counter value
* @max_sqnum: highest sequence number value
* @mean_ec: mean erase counter value
* @ec_sum: a temporary variable used when calculating @mean_ec
* @ec_count: a temporary variable used when calculating @mean_ec
* @scan_leb_slab: slab cache for &struct ubi_scan_leb objects
*
* This data structure contains the result of scanning and may be used by other
* UBI sub-systems to build final UBI data structures, further error-recovery
* and so on.
*/
struct ubi_scan_info {
struct rb_root volumes;
struct list_head corr;
struct list_head free;
struct list_head erase;
struct list_head alien;
int corr_peb_count;
int empty_peb_count;
int alien_peb_count;
int bad_peb_count;
int maybe_bad_peb_count;
int vols_found;
int highest_vol_id;
int is_empty;
int min_ec;
int max_ec;
unsigned long long max_sqnum;
int mean_ec;
uint64_t ec_sum;
int ec_count;
struct kmem_cache *scan_leb_slab;
};
struct ubi_device;
struct ubi_vid_hdr;
/*
* ubi_scan_move_to_list - move a PEB from the volume tree to a list.
*
* @sv: volume scanning information
* @seb: scanning eraseblock information
* @list: the list to move to
*/
static inline void ubi_scan_move_to_list(struct ubi_scan_volume *sv,
struct ubi_scan_leb *seb,
struct list_head *list)
{
rb_erase(&seb->u.rb, &sv->root);
list_add_tail(&seb->u.list, list);
}
int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
int pnum, int ec, const struct ubi_vid_hdr *vid_hdr,
int bitflips);
struct ubi_scan_volume *ubi_scan_find_sv(const struct ubi_scan_info *si,
int vol_id);
struct ubi_scan_leb *ubi_scan_find_seb(const struct ubi_scan_volume *sv,
int lnum);
void ubi_scan_rm_volume(struct ubi_scan_info *si, struct ubi_scan_volume *sv);
struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
struct ubi_scan_info *si);
int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_scan_info *si,
int pnum, int ec);
struct ubi_scan_info *ubi_scan(struct ubi_device *ubi);
void ubi_scan_destroy_si(struct ubi_scan_info *si);
#endif /* !__UBI_SCAN_H__ */
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