9869cd801c
Before UBI got into mainline, there was a slight flash format change - we did not have sequence number support, then added it. We have carried full support of those ancient images till this moment. Now the support is removed, well, not fully removed. Now UBI will support only _clean_ old images, which were cleanly detached last time (just before kernel upgrade). This is most likely the case. But we will not support unclean ancient images. Surprisingly, this allows us to remove a big chunk of legacy code. And the same should be true for downgrading: clean images should downgrade fine, but unclean ones will not. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
163 lines
5.5 KiB
C
163 lines
5.5 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Artem Bityutskiy (Битюцкий Артём)
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*/
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#ifndef __UBI_SCAN_H__
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#define __UBI_SCAN_H__
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/* The erase counter value for this physical eraseblock is unknown */
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#define UBI_SCAN_UNKNOWN_EC (-1)
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/**
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* struct ubi_scan_leb - scanning information about a physical eraseblock.
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* @ec: erase counter (%UBI_SCAN_UNKNOWN_EC if it is unknown)
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* @pnum: physical eraseblock number
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* @lnum: logical eraseblock number
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* @scrub: if this physical eraseblock needs scrubbing
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* @sqnum: sequence number
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* @u: unions RB-tree or @list links
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* @u.rb: link in the per-volume RB-tree of &struct ubi_scan_leb objects
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* @u.list: link in one of the eraseblock lists
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*
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* One object of this type is allocated for each physical eraseblock during
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* scanning.
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*/
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struct ubi_scan_leb {
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int ec;
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int pnum;
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int lnum;
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int scrub;
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unsigned long long sqnum;
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union {
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struct rb_node rb;
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struct list_head list;
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} u;
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};
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/**
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* struct ubi_scan_volume - scanning information about a volume.
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* @vol_id: volume ID
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* @highest_lnum: highest logical eraseblock number in this volume
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* @leb_count: number of logical eraseblocks in this volume
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* @vol_type: volume type
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* @used_ebs: number of used logical eraseblocks in this volume (only for
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* static volumes)
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* @last_data_size: amount of data in the last logical eraseblock of this
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* volume (always equivalent to the usable logical eraseblock
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* size in case of dynamic volumes)
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* @data_pad: how many bytes at the end of logical eraseblocks of this volume
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* are not used (due to volume alignment)
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* @compat: compatibility flags of this volume
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* @rb: link in the volume RB-tree
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* @root: root of the RB-tree containing all the eraseblock belonging to this
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* volume (&struct ubi_scan_leb objects)
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*
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* One object of this type is allocated for each volume during scanning.
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*/
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struct ubi_scan_volume {
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int vol_id;
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int highest_lnum;
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int leb_count;
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int vol_type;
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int used_ebs;
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int last_data_size;
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int data_pad;
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int compat;
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struct rb_node rb;
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struct rb_root root;
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};
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/**
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* struct ubi_scan_info - UBI scanning information.
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* @volumes: root of the volume RB-tree
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* @corr: list of corrupted physical eraseblocks
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* @free: list of free physical eraseblocks
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* @erase: list of physical eraseblocks which have to be erased
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* @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
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* those belonging to "preserve"-compatible internal volumes)
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* @bad_peb_count: count of bad physical eraseblocks
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* @vols_found: number of volumes found during scanning
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* @highest_vol_id: highest volume ID
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* @alien_peb_count: count of physical eraseblocks in the @alien list
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* @is_empty: flag indicating whether the MTD device is empty or not
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* @min_ec: lowest erase counter value
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* @max_ec: highest erase counter value
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* @max_sqnum: highest sequence number value
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* @mean_ec: mean erase counter value
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* @ec_sum: a temporary variable used when calculating @mean_ec
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* @ec_count: a temporary variable used when calculating @mean_ec
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*
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* This data structure contains the result of scanning and may be used by other
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* UBI sub-systems to build final UBI data structures, further error-recovery
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* and so on.
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*/
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struct ubi_scan_info {
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struct rb_root volumes;
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struct list_head corr;
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struct list_head free;
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struct list_head erase;
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struct list_head alien;
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int bad_peb_count;
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int vols_found;
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int highest_vol_id;
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int alien_peb_count;
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int is_empty;
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int min_ec;
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int max_ec;
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unsigned long long max_sqnum;
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int mean_ec;
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uint64_t ec_sum;
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int ec_count;
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};
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struct ubi_device;
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struct ubi_vid_hdr;
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/*
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* ubi_scan_move_to_list - move a PEB from the volume tree to a list.
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*
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* @sv: volume scanning information
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* @seb: scanning eraseblock infprmation
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* @list: the list to move to
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*/
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static inline void ubi_scan_move_to_list(struct ubi_scan_volume *sv,
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struct ubi_scan_leb *seb,
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struct list_head *list)
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{
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rb_erase(&seb->u.rb, &sv->root);
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list_add_tail(&seb->u.list, list);
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}
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int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
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int pnum, int ec, const struct ubi_vid_hdr *vid_hdr,
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int bitflips);
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struct ubi_scan_volume *ubi_scan_find_sv(const struct ubi_scan_info *si,
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int vol_id);
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struct ubi_scan_leb *ubi_scan_find_seb(const struct ubi_scan_volume *sv,
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int lnum);
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void ubi_scan_rm_volume(struct ubi_scan_info *si, struct ubi_scan_volume *sv);
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struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
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struct ubi_scan_info *si);
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int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_scan_info *si,
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int pnum, int ec);
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struct ubi_scan_info *ubi_scan(struct ubi_device *ubi);
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void ubi_scan_destroy_si(struct ubi_scan_info *si);
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#endif /* !__UBI_SCAN_H__ */
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