forked from Minki/linux
633 lines
21 KiB
C
633 lines
21 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2006
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* Copyright (c) Nokia Corporation, 2006, 2007
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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_UBI_H__
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#define __UBI_UBI_H__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/spinlock.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/ubi.h>
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#include "ubi-media.h"
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#include "scan.h"
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#include "debug.h"
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/* Maximum number of supported UBI devices */
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#define UBI_MAX_DEVICES 32
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/* UBI name used for character devices, sysfs, etc */
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#define UBI_NAME_STR "ubi"
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/* Normal UBI messages */
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#define ubi_msg(fmt, ...) printk(KERN_NOTICE "UBI: " fmt "\n", ##__VA_ARGS__)
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/* UBI warning messages */
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#define ubi_warn(fmt, ...) printk(KERN_WARNING "UBI warning: %s: " fmt "\n", \
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__func__, ##__VA_ARGS__)
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/* UBI error messages */
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#define ubi_err(fmt, ...) printk(KERN_ERR "UBI error: %s: " fmt "\n", \
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__func__, ##__VA_ARGS__)
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/* Lowest number PEBs reserved for bad PEB handling */
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#define MIN_RESEVED_PEBS 2
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/* Background thread name pattern */
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#define UBI_BGT_NAME_PATTERN "ubi_bgt%dd"
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/* This marker in the EBA table means that the LEB is um-mapped */
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#define UBI_LEB_UNMAPPED -1
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/*
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* In case of errors, UBI tries to repeat the operation several times before
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* returning error. The below constant defines how many times UBI re-tries.
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*/
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#define UBI_IO_RETRIES 3
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/*
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* Error codes returned by the I/O unit.
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*
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* UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only
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* 0xFF bytes
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* UBI_IO_PEB_FREE: the physical eraseblock is free, i.e. it contains only a
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* valid erase counter header, and the rest are %0xFF bytes
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* UBI_IO_BAD_EC_HDR: the erase counter header is corrupted (bad magic or CRC)
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* UBI_IO_BAD_VID_HDR: the volume identifier header is corrupted (bad magic or
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* CRC)
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* UBI_IO_BITFLIPS: bit-flips were detected and corrected
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*/
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enum {
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UBI_IO_PEB_EMPTY = 1,
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UBI_IO_PEB_FREE,
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UBI_IO_BAD_EC_HDR,
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UBI_IO_BAD_VID_HDR,
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UBI_IO_BITFLIPS
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};
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/**
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* struct ubi_wl_entry - wear-leveling entry.
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* @rb: link in the corresponding RB-tree
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* @ec: erase counter
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* @pnum: physical eraseblock number
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*
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* This data structure is used in the WL unit. Each physical eraseblock has a
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* corresponding &struct wl_entry object which may be kept in different
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* RB-trees. See WL unit for details.
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*/
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struct ubi_wl_entry {
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struct rb_node rb;
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int ec;
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int pnum;
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};
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/**
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* struct ubi_ltree_entry - an entry in the lock tree.
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* @rb: links RB-tree nodes
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* @vol_id: volume ID of the locked logical eraseblock
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* @lnum: locked logical eraseblock number
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* @users: how many tasks are using this logical eraseblock or wait for it
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* @mutex: read/write mutex to implement read/write access serialization to
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* the (@vol_id, @lnum) logical eraseblock
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*
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* This data structure is used in the EBA unit to implement per-LEB locking.
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* When a logical eraseblock is being locked - corresponding
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* &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree).
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* See EBA unit for details.
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*/
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struct ubi_ltree_entry {
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struct rb_node rb;
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int vol_id;
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int lnum;
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int users;
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struct rw_semaphore mutex;
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};
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struct ubi_volume_desc;
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/**
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* struct ubi_volume - UBI volume description data structure.
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* @dev: device object to make use of the the Linux device model
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* @cdev: character device object to create character device
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* @ubi: reference to the UBI device description object
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* @vol_id: volume ID
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* @ref_count: volume reference count
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* @readers: number of users holding this volume in read-only mode
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* @writers: number of users holding this volume in read-write mode
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* @exclusive: whether somebody holds this volume in exclusive mode
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*
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* @reserved_pebs: how many physical eraseblocks are reserved for this volume
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* @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
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* @usable_leb_size: logical eraseblock size without padding
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* @used_ebs: how many logical eraseblocks in this volume contain data
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* @last_eb_bytes: how many bytes are stored in the last logical eraseblock
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* @used_bytes: how many bytes of data this volume contains
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* @alignment: volume alignment
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* @data_pad: how many bytes are not used at the end of physical eraseblocks to
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* satisfy the requested alignment
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* @name_len: volume name length
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* @name: volume name
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*
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* @upd_ebs: how many eraseblocks are expected to be updated
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* @ch_lnum: LEB number which is being changing by the atomic LEB change
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* operation
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* @ch_dtype: data persistency type which is being changing by the atomic LEB
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* change operation
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* @upd_bytes: how many bytes are expected to be received for volume update or
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* atomic LEB change
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* @upd_received: how many bytes were already received for volume update or
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* atomic LEB change
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* @upd_buf: update buffer which is used to collect update data or data for
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* atomic LEB change
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*
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* @eba_tbl: EBA table of this volume (LEB->PEB mapping)
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* @checked: %1 if this static volume was checked
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* @corrupted: %1 if the volume is corrupted (static volumes only)
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* @upd_marker: %1 if the update marker is set for this volume
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* @updating: %1 if the volume is being updated
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* @changing_leb: %1 if the atomic LEB change ioctl command is in progress
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*
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* @gluebi_desc: gluebi UBI volume descriptor
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* @gluebi_refcount: reference count of the gluebi MTD device
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* @gluebi_mtd: MTD device description object of the gluebi MTD device
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*
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* The @corrupted field indicates that the volume's contents is corrupted.
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* Since UBI protects only static volumes, this field is not relevant to
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* dynamic volumes - it is user's responsibility to assure their data
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* integrity.
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*
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* The @upd_marker flag indicates that this volume is either being updated at
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* the moment or is damaged because of an unclean reboot.
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*/
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struct ubi_volume {
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struct device dev;
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struct cdev cdev;
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struct ubi_device *ubi;
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int vol_id;
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int ref_count;
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int readers;
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int writers;
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int exclusive;
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int reserved_pebs;
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int vol_type;
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int usable_leb_size;
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int used_ebs;
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int last_eb_bytes;
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long long used_bytes;
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int alignment;
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int data_pad;
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int name_len;
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char name[UBI_VOL_NAME_MAX+1];
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int upd_ebs;
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int ch_lnum;
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int ch_dtype;
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long long upd_bytes;
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long long upd_received;
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void *upd_buf;
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int *eba_tbl;
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unsigned int checked:1;
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unsigned int corrupted:1;
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unsigned int upd_marker:1;
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unsigned int updating:1;
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unsigned int changing_leb:1;
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#ifdef CONFIG_MTD_UBI_GLUEBI
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/*
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* Gluebi-related stuff may be compiled out.
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* TODO: this should not be built into UBI but should be a separate
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* ubimtd driver which works on top of UBI and emulates MTD devices.
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*/
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struct ubi_volume_desc *gluebi_desc;
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int gluebi_refcount;
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struct mtd_info gluebi_mtd;
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#endif
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};
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/**
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* struct ubi_volume_desc - descriptor of the UBI volume returned when it is
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* opened.
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* @vol: reference to the corresponding volume description object
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* @mode: open mode (%UBI_READONLY, %UBI_READWRITE, or %UBI_EXCLUSIVE)
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*/
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struct ubi_volume_desc {
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struct ubi_volume *vol;
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int mode;
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};
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struct ubi_wl_entry;
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/**
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* struct ubi_device - UBI device description structure
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* @dev: UBI device object to use the the Linux device model
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* @cdev: character device object to create character device
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* @ubi_num: UBI device number
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* @ubi_name: UBI device name
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* @vol_count: number of volumes in this UBI device
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* @volumes: volumes of this UBI device
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* @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs,
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* @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count,
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* @vol->readers, @vol->writers, @vol->exclusive,
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* @vol->ref_count, @vol->mapping and @vol->eba_tbl.
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* @ref_count: count of references on the UBI device
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*
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* @rsvd_pebs: count of reserved physical eraseblocks
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* @avail_pebs: count of available physical eraseblocks
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* @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB
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* handling
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* @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
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*
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* @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
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* of UBI ititializetion
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* @vtbl_slots: how many slots are available in the volume table
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* @vtbl_size: size of the volume table in bytes
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* @vtbl: in-RAM volume table copy
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* @volumes_mutex: protects on-flash volume table and serializes volume
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* changes, like creation, deletion, update, resize
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*
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* @max_ec: current highest erase counter value
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* @mean_ec: current mean erase counter value
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*
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* @global_sqnum: global sequence number
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* @ltree_lock: protects the lock tree and @global_sqnum
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* @ltree: the lock tree
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* @alc_mutex: serializes "atomic LEB change" operations
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*
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* @used: RB-tree of used physical eraseblocks
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* @free: RB-tree of free physical eraseblocks
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* @scrub: RB-tree of physical eraseblocks which need scrubbing
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* @prot: protection trees
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* @prot.pnum: protection tree indexed by physical eraseblock numbers
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* @prot.aec: protection tree indexed by absolute erase counter value
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* @wl_lock: protects the @used, @free, @prot, @lookuptbl, @abs_ec, @move_from,
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* @move_to, @move_to_put @erase_pending, @wl_scheduled, and @works
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* fields
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* @move_mutex: serializes eraseblock moves
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* @wl_scheduled: non-zero if the wear-leveling was scheduled
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* @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any
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* physical eraseblock
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* @abs_ec: absolute erase counter
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* @move_from: physical eraseblock from where the data is being moved
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* @move_to: physical eraseblock where the data is being moved to
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* @move_to_put: if the "to" PEB was put
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* @works: list of pending works
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* @works_count: count of pending works
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* @bgt_thread: background thread description object
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* @thread_enabled: if the background thread is enabled
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* @bgt_name: background thread name
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*
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* @flash_size: underlying MTD device size (in bytes)
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* @peb_count: count of physical eraseblocks on the MTD device
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* @peb_size: physical eraseblock size
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* @bad_peb_count: count of bad physical eraseblocks
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* @good_peb_count: count of good physical eraseblocks
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* @min_io_size: minimal input/output unit size of the underlying MTD device
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* @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
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* @ro_mode: if the UBI device is in read-only mode
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* @leb_size: logical eraseblock size
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* @leb_start: starting offset of logical eraseblocks within physical
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* eraseblocks
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* @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size
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* @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size
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* @vid_hdr_offset: starting offset of the volume identifier header (might be
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* unaligned)
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* @vid_hdr_aloffset: starting offset of the VID header aligned to
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* @hdrs_min_io_size
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* @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset
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* @bad_allowed: whether the MTD device admits of bad physical eraseblocks or
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* not
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* @mtd: MTD device descriptor
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*
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* @peb_buf1: a buffer of PEB size used for different purposes
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* @peb_buf2: another buffer of PEB size used for different purposes
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* @buf_mutex: proptects @peb_buf1 and @peb_buf2
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* @dbg_peb_buf: buffer of PEB size used for debugging
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* @dbg_buf_mutex: proptects @dbg_peb_buf
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*/
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struct ubi_device {
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struct cdev cdev;
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struct device dev;
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int ubi_num;
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char ubi_name[sizeof(UBI_NAME_STR)+5];
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int vol_count;
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struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
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spinlock_t volumes_lock;
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int ref_count;
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int rsvd_pebs;
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int avail_pebs;
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int beb_rsvd_pebs;
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int beb_rsvd_level;
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int autoresize_vol_id;
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int vtbl_slots;
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int vtbl_size;
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struct ubi_vtbl_record *vtbl;
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struct mutex volumes_mutex;
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int max_ec;
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/* TODO: mean_ec is not updated run-time, fix */
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int mean_ec;
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/* EBA unit's stuff */
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unsigned long long global_sqnum;
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spinlock_t ltree_lock;
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struct rb_root ltree;
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struct mutex alc_mutex;
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/* Wear-leveling unit's stuff */
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struct rb_root used;
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struct rb_root free;
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struct rb_root scrub;
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struct {
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struct rb_root pnum;
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struct rb_root aec;
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} prot;
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spinlock_t wl_lock;
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struct mutex move_mutex;
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struct rw_semaphore work_sem;
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int wl_scheduled;
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struct ubi_wl_entry **lookuptbl;
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unsigned long long abs_ec;
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struct ubi_wl_entry *move_from;
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struct ubi_wl_entry *move_to;
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int move_to_put;
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struct list_head works;
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int works_count;
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struct task_struct *bgt_thread;
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int thread_enabled;
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char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2];
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/* I/O unit's stuff */
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long long flash_size;
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int peb_count;
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int peb_size;
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int bad_peb_count;
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int good_peb_count;
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int min_io_size;
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int hdrs_min_io_size;
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int ro_mode;
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int leb_size;
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int leb_start;
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int ec_hdr_alsize;
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int vid_hdr_alsize;
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int vid_hdr_offset;
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int vid_hdr_aloffset;
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int vid_hdr_shift;
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int bad_allowed;
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struct mtd_info *mtd;
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void *peb_buf1;
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void *peb_buf2;
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struct mutex buf_mutex;
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struct mutex ckvol_mutex;
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#ifdef CONFIG_MTD_UBI_DEBUG
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void *dbg_peb_buf;
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struct mutex dbg_buf_mutex;
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#endif
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};
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extern struct kmem_cache *ubi_wl_entry_slab;
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extern struct file_operations ubi_ctrl_cdev_operations;
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extern struct file_operations ubi_cdev_operations;
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extern struct file_operations ubi_vol_cdev_operations;
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extern struct class *ubi_class;
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extern struct mutex ubi_devices_mutex;
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/* vtbl.c */
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int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
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struct ubi_vtbl_record *vtbl_rec);
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int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si);
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/* vmt.c */
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int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req);
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int ubi_remove_volume(struct ubi_volume_desc *desc);
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int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs);
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int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol);
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void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
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/* upd.c */
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int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
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long long bytes);
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int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
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const void __user *buf, int count);
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int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
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const struct ubi_leb_change_req *req);
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int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
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const void __user *buf, int count);
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/* misc.c */
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int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, int length);
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int ubi_check_volume(struct ubi_device *ubi, int vol_id);
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void ubi_calculate_reserved(struct ubi_device *ubi);
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/* gluebi.c */
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#ifdef CONFIG_MTD_UBI_GLUEBI
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int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol);
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int ubi_destroy_gluebi(struct ubi_volume *vol);
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void ubi_gluebi_updated(struct ubi_volume *vol);
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#else
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#define ubi_create_gluebi(ubi, vol) 0
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#define ubi_destroy_gluebi(vol) 0
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#define ubi_gluebi_updated(vol)
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#endif
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/* eba.c */
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int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
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int lnum);
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int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
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void *buf, int offset, int len, int check);
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int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
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const void *buf, int offset, int len, int dtype);
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int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
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int lnum, const void *buf, int len, int dtype,
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int used_ebs);
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int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
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int lnum, const void *buf, int len, int dtype);
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int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
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struct ubi_vid_hdr *vid_hdr);
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int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si);
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void ubi_eba_close(const struct ubi_device *ubi);
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/* wl.c */
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int ubi_wl_get_peb(struct ubi_device *ubi, int dtype);
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int ubi_wl_put_peb(struct ubi_device *ubi, int pnum, int torture);
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int ubi_wl_flush(struct ubi_device *ubi);
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int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
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int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si);
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void ubi_wl_close(struct ubi_device *ubi);
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int ubi_thread(void *u);
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/* io.c */
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int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
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int len);
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int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
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int len);
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int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture);
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int ubi_io_is_bad(const struct ubi_device *ubi, int pnum);
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int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum);
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int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
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struct ubi_ec_hdr *ec_hdr, int verbose);
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int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
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struct ubi_ec_hdr *ec_hdr);
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int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
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struct ubi_vid_hdr *vid_hdr, int verbose);
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int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
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struct ubi_vid_hdr *vid_hdr);
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/* build.c */
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int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset);
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int ubi_detach_mtd_dev(int ubi_num, int anyway);
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struct ubi_device *ubi_get_device(int ubi_num);
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void ubi_put_device(struct ubi_device *ubi);
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struct ubi_device *ubi_get_by_major(int major);
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int ubi_major2num(int major);
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/*
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* ubi_rb_for_each_entry - walk an RB-tree.
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* @rb: a pointer to type 'struct rb_node' to to use as a loop counter
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* @pos: a pointer to RB-tree entry type to use as a loop counter
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* @root: RB-tree's root
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* @member: the name of the 'struct rb_node' within the RB-tree entry
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*/
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#define ubi_rb_for_each_entry(rb, pos, root, member) \
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for (rb = rb_first(root), \
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pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \
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rb; \
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rb = rb_next(rb), pos = container_of(rb, typeof(*pos), member))
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/**
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* ubi_zalloc_vid_hdr - allocate a volume identifier header object.
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* @ubi: UBI device description object
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* @gfp_flags: GFP flags to allocate with
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*
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* This function returns a pointer to the newly allocated and zero-filled
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* volume identifier header object in case of success and %NULL in case of
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* failure.
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*/
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static inline struct ubi_vid_hdr *
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ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags)
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{
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void *vid_hdr;
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vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags);
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if (!vid_hdr)
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return NULL;
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/*
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* VID headers may be stored at un-aligned flash offsets, so we shift
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* the pointer.
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*/
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return vid_hdr + ubi->vid_hdr_shift;
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}
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/**
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* ubi_free_vid_hdr - free a volume identifier header object.
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* @ubi: UBI device description object
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* @vid_hdr: the object to free
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*/
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static inline void ubi_free_vid_hdr(const struct ubi_device *ubi,
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struct ubi_vid_hdr *vid_hdr)
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{
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void *p = vid_hdr;
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if (!p)
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return;
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kfree(p - ubi->vid_hdr_shift);
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}
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/*
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* This function is equivalent to 'ubi_io_read()', but @offset is relative to
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* the beginning of the logical eraseblock, not to the beginning of the
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* physical eraseblock.
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*/
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static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf,
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int pnum, int offset, int len)
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{
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ubi_assert(offset >= 0);
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return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len);
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}
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/*
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* This function is equivalent to 'ubi_io_write()', but @offset is relative to
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* the beginning of the logical eraseblock, not to the beginning of the
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* physical eraseblock.
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*/
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static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf,
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int pnum, int offset, int len)
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{
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ubi_assert(offset >= 0);
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return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len);
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}
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/**
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* ubi_ro_mode - switch to read-only mode.
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* @ubi: UBI device description object
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*/
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static inline void ubi_ro_mode(struct ubi_device *ubi)
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{
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if (!ubi->ro_mode) {
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ubi->ro_mode = 1;
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ubi_warn("switch to read-only mode");
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}
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}
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/**
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* vol_id2idx - get table index by volume ID.
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* @ubi: UBI device description object
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* @vol_id: volume ID
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*/
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static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id)
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{
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if (vol_id >= UBI_INTERNAL_VOL_START)
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return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots;
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else
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return vol_id;
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}
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/**
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* idx2vol_id - get volume ID by table index.
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* @ubi: UBI device description object
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* @idx: table index
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*/
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static inline int idx2vol_id(const struct ubi_device *ubi, int idx)
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{
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if (idx >= ubi->vtbl_slots)
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return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START;
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else
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return idx;
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}
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#endif /* !__UBI_UBI_H__ */
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