1241 lines
42 KiB
C
1241 lines
42 KiB
C
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/*
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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/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/slab.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <linux/notifier.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/ubi.h>
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#include <asm/pgtable.h>
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#include "ubi-media.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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struct ubi_device;
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/* Normal UBI messages */
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__printf(2, 3)
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void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...);
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/* UBI warning messages */
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__printf(2, 3)
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void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...);
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/* UBI error messages */
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__printf(2, 3)
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void ubi_err(const struct ubi_device *ubi, const char *fmt, ...);
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/* Background thread name pattern */
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#define UBI_BGT_NAME_PATTERN "ubi_bgt%dd"
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/*
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* This marker in the EBA table means that the LEB is um-mapped.
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* NOTE! It has to have the same value as %UBI_ALL.
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*/
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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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* Length of the protection queue. The length is effectively equivalent to the
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* number of (global) erase cycles PEBs are protected from the wear-leveling
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* worker.
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*/
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#define UBI_PROT_QUEUE_LEN 10
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/* The volume ID/LEB number/erase counter is unknown */
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#define UBI_UNKNOWN -1
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/*
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* The UBI debugfs directory name pattern and maximum name length (3 for "ubi"
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* + 2 for the number plus 1 for the trailing zero byte.
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*/
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#define UBI_DFS_DIR_NAME "ubi%d"
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#define UBI_DFS_DIR_LEN (3 + 2 + 1)
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/*
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* Error codes returned by the I/O sub-system.
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*
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* UBI_IO_FF: the read region of flash contains only 0xFFs
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* UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data
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* integrity error reported by the MTD driver
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* (uncorrectable ECC error in case of NAND)
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* UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC)
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* UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a
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* data integrity error reported by the MTD driver
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* (uncorrectable ECC error in case of NAND)
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* UBI_IO_BITFLIPS: bit-flips were detected and corrected
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*
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* Note, it is probably better to have bit-flip and ebadmsg as flags which can
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* be or'ed with other error code. But this is a big change because there are
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* may callers, so it does not worth the risk of introducing a bug
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*/
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enum {
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UBI_IO_FF = 1,
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UBI_IO_FF_BITFLIPS,
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UBI_IO_BAD_HDR,
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UBI_IO_BAD_HDR_EBADMSG,
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UBI_IO_BITFLIPS,
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};
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/*
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* Return codes of the 'ubi_eba_copy_leb()' function.
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*
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* MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source
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* PEB was put meanwhile, or there is I/O on the source PEB
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* MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source
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* PEB
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* MOVE_TARGET_RD_ERR: canceled because there was a read error from the target
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* PEB
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* MOVE_TARGET_WR_ERR: canceled because there was a write error to the target
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* PEB
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* MOVE_TARGET_BITFLIPS: canceled because a bit-flip was detected in the
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* target PEB
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* MOVE_RETRY: retry scrubbing the PEB
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*/
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enum {
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MOVE_CANCEL_RACE = 1,
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MOVE_SOURCE_RD_ERR,
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MOVE_TARGET_RD_ERR,
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MOVE_TARGET_WR_ERR,
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MOVE_TARGET_BITFLIPS,
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MOVE_RETRY,
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};
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/*
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* Return codes of the fastmap sub-system
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*
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* UBI_NO_FASTMAP: No fastmap super block was found
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* UBI_BAD_FASTMAP: A fastmap was found but it's unusable
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*/
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enum {
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UBI_NO_FASTMAP = 1,
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UBI_BAD_FASTMAP,
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};
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/*
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* Flags for emulate_power_cut in ubi_debug_info
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*
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* POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header
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* POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header
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*/
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enum {
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POWER_CUT_EC_WRITE = 0x01,
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POWER_CUT_VID_WRITE = 0x02,
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};
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/**
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* struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the
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* flash.
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* @hdr: a pointer to the VID header stored in buffer
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* @buffer: underlying buffer
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*/
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struct ubi_vid_io_buf {
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struct ubi_vid_hdr *hdr;
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void *buffer;
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};
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/**
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* struct ubi_wl_entry - wear-leveling entry.
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* @u.rb: link in the corresponding (free/used) RB-tree
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* @u.list: link in the protection queue
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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 sub-system. Each physical eraseblock
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* has a corresponding &struct wl_entry object which may be kept in different
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* RB-trees. See WL sub-system for details.
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*/
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struct ubi_wl_entry {
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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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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 sub-system to implement per-LEB
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* locking. 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 sub-system 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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/**
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* struct ubi_rename_entry - volume re-name description data structure.
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* @new_name_len: new volume name length
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* @new_name: new volume name
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* @remove: if not zero, this volume should be removed, not re-named
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* @desc: descriptor of the volume
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* @list: links re-name entries into a list
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*
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* This data structure is utilized in the multiple volume re-name code. Namely,
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* UBI first creates a list of &struct ubi_rename_entry objects from the
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* &struct ubi_rnvol_req request object, and then utilizes this list to do all
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* the job.
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*/
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struct ubi_rename_entry {
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int new_name_len;
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char new_name[UBI_VOL_NAME_MAX + 1];
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int remove;
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struct ubi_volume_desc *desc;
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struct list_head list;
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};
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struct ubi_volume_desc;
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/**
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* struct ubi_fastmap_layout - in-memory fastmap data structure.
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* @e: PEBs used by the current fastmap
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* @to_be_tortured: if non-zero tortured this PEB
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* @used_blocks: number of used PEBs
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* @max_pool_size: maximal size of the user pool
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* @max_wl_pool_size: maximal size of the pool used by the WL sub-system
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*/
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struct ubi_fastmap_layout {
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struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
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int to_be_tortured[UBI_FM_MAX_BLOCKS];
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int used_blocks;
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int max_pool_size;
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int max_wl_pool_size;
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};
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/**
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* struct ubi_fm_pool - in-memory fastmap pool
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* @pebs: PEBs in this pool
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* @used: number of used PEBs
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* @size: total number of PEBs in this pool
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* @max_size: maximal size of the pool
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*
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* A pool gets filled with up to max_size.
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* If all PEBs within the pool are used a new fastmap will be written
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* to the flash and the pool gets refilled with empty PEBs.
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*
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*/
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struct ubi_fm_pool {
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int pebs[UBI_FM_MAX_POOL_SIZE];
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int used;
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int size;
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int max_size;
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};
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/**
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* struct ubi_eba_leb_desc - EBA logical eraseblock descriptor
|
|||
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* @lnum: the logical eraseblock number
|
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* @pnum: the physical eraseblock where the LEB can be found
|
|||
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*
|
|||
|
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* This structure is here to hide EBA's internal from other part of the
|
|||
|
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* UBI implementation.
|
|||
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*
|
|||
|
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* One can query the position of a LEB by calling ubi_eba_get_ldesc().
|
|||
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*/
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struct ubi_eba_leb_desc {
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int lnum;
|
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int pnum;
|
|||
|
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};
|
|||
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|
|
|||
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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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* @metaonly: whether somebody is altering only meta data of this volume
|
|||
|
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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
|
|||
|
|
* @used_bytes: how many bytes of data this volume contains
|
|||
|
|
* @alignment: volume alignment
|
|||
|
|
* @data_pad: how many bytes are not used at the end of physical eraseblocks to
|
|||
|
|
* satisfy the requested alignment
|
|||
|
|
* @name_len: volume name length
|
|||
|
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* @name: volume name
|
|||
|
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*
|
|||
|
|
* @upd_ebs: how many eraseblocks are expected to be updated
|
|||
|
|
* @ch_lnum: LEB number which is being changing by the atomic LEB change
|
|||
|
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* operation
|
|||
|
|
* @upd_bytes: how many bytes are expected to be received for volume update or
|
|||
|
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* atomic LEB change
|
|||
|
|
* @upd_received: how many bytes were already received for volume update or
|
|||
|
|
* atomic LEB change
|
|||
|
|
* @upd_buf: update buffer which is used to collect update data or data for
|
|||
|
|
* atomic LEB change
|
|||
|
|
*
|
|||
|
|
* @eba_tbl: EBA table of this volume (LEB->PEB mapping)
|
|||
|
|
* @skip_check: %1 if CRC check of this static volume should be skipped.
|
|||
|
|
* Directly reflects the presence of the
|
|||
|
|
* %UBI_VTBL_SKIP_CRC_CHECK_FLG flag in the vtbl entry
|
|||
|
|
* @checked: %1 if this static volume was checked
|
|||
|
|
* @corrupted: %1 if the volume is corrupted (static volumes only)
|
|||
|
|
* @upd_marker: %1 if the update marker is set for this volume
|
|||
|
|
* @updating: %1 if the volume is being updated
|
|||
|
|
* @changing_leb: %1 if the atomic LEB change ioctl command is in progress
|
|||
|
|
* @direct_writes: %1 if direct writes are enabled for this volume
|
|||
|
|
*
|
|||
|
|
* @checkmap: bitmap to remember which PEB->LEB mappings got checked,
|
|||
|
|
* protected by UBI LEB lock tree.
|
|||
|
|
*
|
|||
|
|
* The @corrupted field indicates that the volume's contents is corrupted.
|
|||
|
|
* Since UBI protects only static volumes, this field is not relevant to
|
|||
|
|
* dynamic volumes - it is user's responsibility to assure their data
|
|||
|
|
* integrity.
|
|||
|
|
*
|
|||
|
|
* The @upd_marker flag indicates that this volume is either being updated at
|
|||
|
|
* the moment or is damaged because of an unclean reboot.
|
|||
|
|
*/
|
|||
|
|
struct ubi_volume {
|
|||
|
|
struct device dev;
|
|||
|
|
struct cdev cdev;
|
|||
|
|
struct ubi_device *ubi;
|
|||
|
|
int vol_id;
|
|||
|
|
int ref_count;
|
|||
|
|
int readers;
|
|||
|
|
int writers;
|
|||
|
|
int exclusive;
|
|||
|
|
int metaonly;
|
|||
|
|
|
|||
|
|
int reserved_pebs;
|
|||
|
|
int vol_type;
|
|||
|
|
int usable_leb_size;
|
|||
|
|
int used_ebs;
|
|||
|
|
int last_eb_bytes;
|
|||
|
|
long long used_bytes;
|
|||
|
|
int alignment;
|
|||
|
|
int data_pad;
|
|||
|
|
int name_len;
|
|||
|
|
char name[UBI_VOL_NAME_MAX + 1];
|
|||
|
|
|
|||
|
|
int upd_ebs;
|
|||
|
|
int ch_lnum;
|
|||
|
|
long long upd_bytes;
|
|||
|
|
long long upd_received;
|
|||
|
|
void *upd_buf;
|
|||
|
|
|
|||
|
|
struct ubi_eba_table *eba_tbl;
|
|||
|
|
unsigned int skip_check:1;
|
|||
|
|
unsigned int checked:1;
|
|||
|
|
unsigned int corrupted:1;
|
|||
|
|
unsigned int upd_marker:1;
|
|||
|
|
unsigned int updating:1;
|
|||
|
|
unsigned int changing_leb:1;
|
|||
|
|
unsigned int direct_writes:1;
|
|||
|
|
|
|||
|
|
#ifdef CONFIG_MTD_UBI_FASTMAP
|
|||
|
|
unsigned long *checkmap;
|
|||
|
|
#endif
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* struct ubi_volume_desc - UBI volume descriptor returned when it is opened.
|
|||
|
|
* @vol: reference to the corresponding volume description object
|
|||
|
|
* @mode: open mode (%UBI_READONLY, %UBI_READWRITE, %UBI_EXCLUSIVE
|
|||
|
|
* or %UBI_METAONLY)
|
|||
|
|
*/
|
|||
|
|
struct ubi_volume_desc {
|
|||
|
|
struct ubi_volume *vol;
|
|||
|
|
int mode;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
struct ubi_wl_entry;
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* struct ubi_debug_info - debugging information for an UBI device.
|
|||
|
|
*
|
|||
|
|
* @chk_gen: if UBI general extra checks are enabled
|
|||
|
|
* @chk_io: if UBI I/O extra checks are enabled
|
|||
|
|
* @chk_fastmap: if UBI fastmap extra checks are enabled
|
|||
|
|
* @disable_bgt: disable the background task for testing purposes
|
|||
|
|
* @emulate_bitflips: emulate bit-flips for testing purposes
|
|||
|
|
* @emulate_io_failures: emulate write/erase failures for testing purposes
|
|||
|
|
* @emulate_power_cut: emulate power cut for testing purposes
|
|||
|
|
* @power_cut_counter: count down for writes left until emulated power cut
|
|||
|
|
* @power_cut_min: minimum number of writes before emulating a power cut
|
|||
|
|
* @power_cut_max: maximum number of writes until emulating a power cut
|
|||
|
|
* @dfs_dir_name: name of debugfs directory containing files of this UBI device
|
|||
|
|
* @dfs_dir: direntry object of the UBI device debugfs directory
|
|||
|
|
* @dfs_chk_gen: debugfs knob to enable UBI general extra checks
|
|||
|
|
* @dfs_chk_io: debugfs knob to enable UBI I/O extra checks
|
|||
|
|
* @dfs_chk_fastmap: debugfs knob to enable UBI fastmap extra checks
|
|||
|
|
* @dfs_disable_bgt: debugfs knob to disable the background task
|
|||
|
|
* @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
|
|||
|
|
* @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
|
|||
|
|
* @dfs_emulate_power_cut: debugfs knob to emulate power cuts
|
|||
|
|
* @dfs_power_cut_min: debugfs knob for minimum writes before power cut
|
|||
|
|
* @dfs_power_cut_max: debugfs knob for maximum writes until power cut
|
|||
|
|
*/
|
|||
|
|
struct ubi_debug_info {
|
|||
|
|
unsigned int chk_gen:1;
|
|||
|
|
unsigned int chk_io:1;
|
|||
|
|
unsigned int chk_fastmap:1;
|
|||
|
|
unsigned int disable_bgt:1;
|
|||
|
|
unsigned int emulate_bitflips:1;
|
|||
|
|
unsigned int emulate_io_failures:1;
|
|||
|
|
unsigned int emulate_power_cut:2;
|
|||
|
|
unsigned int power_cut_counter;
|
|||
|
|
unsigned int power_cut_min;
|
|||
|
|
unsigned int power_cut_max;
|
|||
|
|
char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
|
|||
|
|
struct dentry *dfs_dir;
|
|||
|
|
struct dentry *dfs_chk_gen;
|
|||
|
|
struct dentry *dfs_chk_io;
|
|||
|
|
struct dentry *dfs_chk_fastmap;
|
|||
|
|
struct dentry *dfs_disable_bgt;
|
|||
|
|
struct dentry *dfs_emulate_bitflips;
|
|||
|
|
struct dentry *dfs_emulate_io_failures;
|
|||
|
|
struct dentry *dfs_emulate_power_cut;
|
|||
|
|
struct dentry *dfs_power_cut_min;
|
|||
|
|
struct dentry *dfs_power_cut_max;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* struct ubi_device - UBI device description structure
|
|||
|
|
* @dev: UBI device object to use the the Linux device model
|
|||
|
|
* @cdev: character device object to create character device
|
|||
|
|
* @ubi_num: UBI device number
|
|||
|
|
* @ubi_name: UBI device name
|
|||
|
|
* @vol_count: number of volumes in this UBI device
|
|||
|
|
* @volumes: volumes of this UBI device
|
|||
|
|
* @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs,
|
|||
|
|
* @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count,
|
|||
|
|
* @vol->readers, @vol->writers, @vol->exclusive,
|
|||
|
|
* @vol->metaonly, @vol->ref_count, @vol->mapping and
|
|||
|
|
* @vol->eba_tbl.
|
|||
|
|
* @ref_count: count of references on the UBI device
|
|||
|
|
* @image_seq: image sequence number recorded on EC headers
|
|||
|
|
*
|
|||
|
|
* @rsvd_pebs: count of reserved physical eraseblocks
|
|||
|
|
* @avail_pebs: count of available physical eraseblocks
|
|||
|
|
* @beb_rsvd_pebs: how many physical eraseblocks are reserved for bad PEB
|
|||
|
|
* handling
|
|||
|
|
* @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
|
|||
|
|
*
|
|||
|
|
* @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
|
|||
|
|
* of UBI initialization
|
|||
|
|
* @vtbl_slots: how many slots are available in the volume table
|
|||
|
|
* @vtbl_size: size of the volume table in bytes
|
|||
|
|
* @vtbl: in-RAM volume table copy
|
|||
|
|
* @device_mutex: protects on-flash volume table and serializes volume
|
|||
|
|
* creation, deletion, update, re-size, re-name and set
|
|||
|
|
* property
|
|||
|
|
*
|
|||
|
|
* @max_ec: current highest erase counter value
|
|||
|
|
* @mean_ec: current mean erase counter value
|
|||
|
|
*
|
|||
|
|
* @global_sqnum: global sequence number
|
|||
|
|
* @ltree_lock: protects the lock tree and @global_sqnum
|
|||
|
|
* @ltree: the lock tree
|
|||
|
|
* @alc_mutex: serializes "atomic LEB change" operations
|
|||
|
|
*
|
|||
|
|
* @fm_disabled: non-zero if fastmap is disabled (default)
|
|||
|
|
* @fm: in-memory data structure of the currently used fastmap
|
|||
|
|
* @fm_pool: in-memory data structure of the fastmap pool
|
|||
|
|
* @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
|
|||
|
|
* sub-system
|
|||
|
|
* @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure
|
|||
|
|
* that critical sections cannot be interrupted by ubi_update_fastmap()
|
|||
|
|
* @fm_buf: vmalloc()'d buffer which holds the raw fastmap
|
|||
|
|
* @fm_size: fastmap size in bytes
|
|||
|
|
* @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes
|
|||
|
|
* @fm_work: fastmap work queue
|
|||
|
|
* @fm_work_scheduled: non-zero if fastmap work was scheduled
|
|||
|
|
* @fast_attach: non-zero if UBI was attached by fastmap
|
|||
|
|
* @fm_anchor: The next anchor PEB to use for fastmap
|
|||
|
|
* @fm_do_produce_anchor: If true produce an anchor PEB in wl
|
|||
|
|
*
|
|||
|
|
* @used: RB-tree of used physical eraseblocks
|
|||
|
|
* @erroneous: RB-tree of erroneous used physical eraseblocks
|
|||
|
|
* @free: RB-tree of free physical eraseblocks
|
|||
|
|
* @free_count: Contains the number of elements in @free
|
|||
|
|
* @scrub: RB-tree of physical eraseblocks which need scrubbing
|
|||
|
|
* @pq: protection queue (contain physical eraseblocks which are temporarily
|
|||
|
|
* protected from the wear-leveling worker)
|
|||
|
|
* @pq_head: protection queue head
|
|||
|
|
* @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
|
|||
|
|
* @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
|
|||
|
|
* @erroneous, @erroneous_peb_count, @fm_work_scheduled, @fm_pool,
|
|||
|
|
* and @fm_wl_pool fields
|
|||
|
|
* @move_mutex: serializes eraseblock moves
|
|||
|
|
* @work_sem: used to wait for all the scheduled works to finish and prevent
|
|||
|
|
* new works from being submitted
|
|||
|
|
* @wl_scheduled: non-zero if the wear-leveling was scheduled
|
|||
|
|
* @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any
|
|||
|
|
* physical eraseblock
|
|||
|
|
* @move_from: physical eraseblock from where the data is being moved
|
|||
|
|
* @move_to: physical eraseblock where the data is being moved to
|
|||
|
|
* @move_to_put: if the "to" PEB was put
|
|||
|
|
* @works: list of pending works
|
|||
|
|
* @works_count: count of pending works
|
|||
|
|
* @bgt_thread: background thread description object
|
|||
|
|
* @thread_enabled: if the background thread is enabled
|
|||
|
|
* @bgt_name: background thread name
|
|||
|
|
*
|
|||
|
|
* @flash_size: underlying MTD device size (in bytes)
|
|||
|
|
* @peb_count: count of physical eraseblocks on the MTD device
|
|||
|
|
* @peb_size: physical eraseblock size
|
|||
|
|
* @bad_peb_limit: top limit of expected bad physical eraseblocks
|
|||
|
|
* @bad_peb_count: count of bad physical eraseblocks
|
|||
|
|
* @good_peb_count: count of good physical eraseblocks
|
|||
|
|
* @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
|
|||
|
|
* used by UBI)
|
|||
|
|
* @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
|
|||
|
|
* @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
|
|||
|
|
* @min_io_size: minimal input/output unit size of the underlying MTD device
|
|||
|
|
* @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
|
|||
|
|
* @ro_mode: if the UBI device is in read-only mode
|
|||
|
|
* @leb_size: logical eraseblock size
|
|||
|
|
* @leb_start: starting offset of logical eraseblocks within physical
|
|||
|
|
* eraseblocks
|
|||
|
|
* @ec_hdr_alsize: size of the EC header aligned to @hdrs_min_io_size
|
|||
|
|
* @vid_hdr_alsize: size of the VID header aligned to @hdrs_min_io_size
|
|||
|
|
* @vid_hdr_offset: starting offset of the volume identifier header (might be
|
|||
|
|
* unaligned)
|
|||
|
|
* @vid_hdr_aloffset: starting offset of the VID header aligned to
|
|||
|
|
* @hdrs_min_io_size
|
|||
|
|
* @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset
|
|||
|
|
* @bad_allowed: whether the MTD device admits bad physical eraseblocks or not
|
|||
|
|
* @nor_flash: non-zero if working on top of NOR flash
|
|||
|
|
* @max_write_size: maximum amount of bytes the underlying flash can write at a
|
|||
|
|
* time (MTD write buffer size)
|
|||
|
|
* @mtd: MTD device descriptor
|
|||
|
|
*
|
|||
|
|
* @peb_buf: a buffer of PEB size used for different purposes
|
|||
|
|
* @buf_mutex: protects @peb_buf
|
|||
|
|
* @ckvol_mutex: serializes static volume checking when opening
|
|||
|
|
*
|
|||
|
|
* @dbg: debugging information for this UBI device
|
|||
|
|
*/
|
|||
|
|
struct ubi_device {
|
|||
|
|
struct cdev cdev;
|
|||
|
|
struct device dev;
|
|||
|
|
int ubi_num;
|
|||
|
|
char ubi_name[sizeof(UBI_NAME_STR)+5];
|
|||
|
|
int vol_count;
|
|||
|
|
struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
|
|||
|
|
spinlock_t volumes_lock;
|
|||
|
|
int ref_count;
|
|||
|
|
int image_seq;
|
|||
|
|
|
|||
|
|
int rsvd_pebs;
|
|||
|
|
int avail_pebs;
|
|||
|
|
int beb_rsvd_pebs;
|
|||
|
|
int beb_rsvd_level;
|
|||
|
|
int bad_peb_limit;
|
|||
|
|
|
|||
|
|
int autoresize_vol_id;
|
|||
|
|
int vtbl_slots;
|
|||
|
|
int vtbl_size;
|
|||
|
|
struct ubi_vtbl_record *vtbl;
|
|||
|
|
struct mutex device_mutex;
|
|||
|
|
|
|||
|
|
int max_ec;
|
|||
|
|
/* Note, mean_ec is not updated run-time - should be fixed */
|
|||
|
|
int mean_ec;
|
|||
|
|
|
|||
|
|
/* EBA sub-system's stuff */
|
|||
|
|
unsigned long long global_sqnum;
|
|||
|
|
spinlock_t ltree_lock;
|
|||
|
|
struct rb_root ltree;
|
|||
|
|
struct mutex alc_mutex;
|
|||
|
|
|
|||
|
|
/* Fastmap stuff */
|
|||
|
|
int fm_disabled;
|
|||
|
|
struct ubi_fastmap_layout *fm;
|
|||
|
|
struct ubi_fm_pool fm_pool;
|
|||
|
|
struct ubi_fm_pool fm_wl_pool;
|
|||
|
|
struct rw_semaphore fm_eba_sem;
|
|||
|
|
struct rw_semaphore fm_protect;
|
|||
|
|
void *fm_buf;
|
|||
|
|
size_t fm_size;
|
|||
|
|
struct work_struct fm_work;
|
|||
|
|
int fm_work_scheduled;
|
|||
|
|
int fast_attach;
|
|||
|
|
struct ubi_wl_entry *fm_anchor;
|
|||
|
|
int fm_do_produce_anchor;
|
|||
|
|
|
|||
|
|
/* Wear-leveling sub-system's stuff */
|
|||
|
|
struct rb_root used;
|
|||
|
|
struct rb_root erroneous;
|
|||
|
|
struct rb_root free;
|
|||
|
|
int free_count;
|
|||
|
|
struct rb_root scrub;
|
|||
|
|
struct list_head pq[UBI_PROT_QUEUE_LEN];
|
|||
|
|
int pq_head;
|
|||
|
|
spinlock_t wl_lock;
|
|||
|
|
struct mutex move_mutex;
|
|||
|
|
struct rw_semaphore work_sem;
|
|||
|
|
int wl_scheduled;
|
|||
|
|
struct ubi_wl_entry **lookuptbl;
|
|||
|
|
struct ubi_wl_entry *move_from;
|
|||
|
|
struct ubi_wl_entry *move_to;
|
|||
|
|
int move_to_put;
|
|||
|
|
struct list_head works;
|
|||
|
|
int works_count;
|
|||
|
|
struct task_struct *bgt_thread;
|
|||
|
|
int thread_enabled;
|
|||
|
|
char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2];
|
|||
|
|
|
|||
|
|
/* I/O sub-system's stuff */
|
|||
|
|
long long flash_size;
|
|||
|
|
int peb_count;
|
|||
|
|
int peb_size;
|
|||
|
|
int bad_peb_count;
|
|||
|
|
int good_peb_count;
|
|||
|
|
int corr_peb_count;
|
|||
|
|
int erroneous_peb_count;
|
|||
|
|
int max_erroneous;
|
|||
|
|
int min_io_size;
|
|||
|
|
int hdrs_min_io_size;
|
|||
|
|
int ro_mode;
|
|||
|
|
int leb_size;
|
|||
|
|
int leb_start;
|
|||
|
|
int ec_hdr_alsize;
|
|||
|
|
int vid_hdr_alsize;
|
|||
|
|
int vid_hdr_offset;
|
|||
|
|
int vid_hdr_aloffset;
|
|||
|
|
int vid_hdr_shift;
|
|||
|
|
unsigned int bad_allowed:1;
|
|||
|
|
unsigned int nor_flash:1;
|
|||
|
|
int max_write_size;
|
|||
|
|
struct mtd_info *mtd;
|
|||
|
|
|
|||
|
|
void *peb_buf;
|
|||
|
|
struct mutex buf_mutex;
|
|||
|
|
struct mutex ckvol_mutex;
|
|||
|
|
|
|||
|
|
struct ubi_debug_info dbg;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* struct ubi_ainf_peb - attach information about a physical eraseblock.
|
|||
|
|
* @ec: erase counter (%UBI_UNKNOWN if it is unknown)
|
|||
|
|
* @pnum: physical eraseblock number
|
|||
|
|
* @vol_id: ID of the volume this LEB belongs to
|
|||
|
|
* @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_ainf_peb objects
|
|||
|
|
* @u.list: link in one of the eraseblock lists
|
|||
|
|
*
|
|||
|
|
* One object of this type is allocated for each physical eraseblock when
|
|||
|
|
* attaching an MTD device. Note, if this PEB does not belong to any LEB /
|
|||
|
|
* volume, the @vol_id and @lnum fields are initialized to %UBI_UNKNOWN.
|
|||
|
|
*/
|
|||
|
|
struct ubi_ainf_peb {
|
|||
|
|
int ec;
|
|||
|
|
int pnum;
|
|||
|
|
int vol_id;
|
|||
|
|
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_ainf_volume - attaching 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_ainf_peb objects)
|
|||
|
|
*
|
|||
|
|
* One object of this type is allocated for each volume when attaching an MTD
|
|||
|
|
* device.
|
|||
|
|
*/
|
|||
|
|
struct ubi_ainf_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_attach_info - MTD device attaching 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)
|
|||
|
|
* @fastmap: list of physical eraseblocks which relate to fastmap (e.g.,
|
|||
|
|
* eraseblocks of the current and not yet erased old fastmap blocks)
|
|||
|
|
* @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
|
|||
|
|
* @highest_vol_id: highest volume ID
|
|||
|
|
* @is_empty: flag indicating whether the MTD device is empty or not
|
|||
|
|
* @force_full_scan: flag indicating whether we need to do a full scan and drop
|
|||
|
|
all existing Fastmap data structures
|
|||
|
|
* @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
|
|||
|
|
* @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects
|
|||
|
|
* @ech: temporary EC header. Only available during scan
|
|||
|
|
* @vidh: temporary VID buffer. Only available during scan
|
|||
|
|
*
|
|||
|
|
* This data structure contains the result of attaching an MTD device and may
|
|||
|
|
* be used by other UBI sub-systems to build final UBI data structures, further
|
|||
|
|
* error-recovery and so on.
|
|||
|
|
*/
|
|||
|
|
struct ubi_attach_info {
|
|||
|
|
struct rb_root volumes;
|
|||
|
|
struct list_head corr;
|
|||
|
|
struct list_head free;
|
|||
|
|
struct list_head erase;
|
|||
|
|
struct list_head alien;
|
|||
|
|
struct list_head fastmap;
|
|||
|
|
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 force_full_scan;
|
|||
|
|
int min_ec;
|
|||
|
|
int max_ec;
|
|||
|
|
unsigned long long max_sqnum;
|
|||
|
|
int mean_ec;
|
|||
|
|
uint64_t ec_sum;
|
|||
|
|
int ec_count;
|
|||
|
|
struct kmem_cache *aeb_slab_cache;
|
|||
|
|
struct ubi_ec_hdr *ech;
|
|||
|
|
struct ubi_vid_io_buf *vidb;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* struct ubi_work - UBI work description data structure.
|
|||
|
|
* @list: a link in the list of pending works
|
|||
|
|
* @func: worker function
|
|||
|
|
* @e: physical eraseblock to erase
|
|||
|
|
* @vol_id: the volume ID on which this erasure is being performed
|
|||
|
|
* @lnum: the logical eraseblock number
|
|||
|
|
* @torture: if the physical eraseblock has to be tortured
|
|||
|
|
*
|
|||
|
|
* The @func pointer points to the worker function. If the @shutdown argument is
|
|||
|
|
* not zero, the worker has to free the resources and exit immediately as the
|
|||
|
|
* WL sub-system is shutting down.
|
|||
|
|
* The worker has to return zero in case of success and a negative error code in
|
|||
|
|
* case of failure.
|
|||
|
|
*/
|
|||
|
|
struct ubi_work {
|
|||
|
|
struct list_head list;
|
|||
|
|
int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int shutdown);
|
|||
|
|
/* The below fields are only relevant to erasure works */
|
|||
|
|
struct ubi_wl_entry *e;
|
|||
|
|
int vol_id;
|
|||
|
|
int lnum;
|
|||
|
|
int torture;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
#include "debug.h"
|
|||
|
|
|
|||
|
|
extern struct kmem_cache *ubi_wl_entry_slab;
|
|||
|
|
extern const struct file_operations ubi_ctrl_cdev_operations;
|
|||
|
|
extern const struct file_operations ubi_cdev_operations;
|
|||
|
|
extern const struct file_operations ubi_vol_cdev_operations;
|
|||
|
|
extern struct class ubi_class;
|
|||
|
|
extern struct mutex ubi_devices_mutex;
|
|||
|
|
extern struct blocking_notifier_head ubi_notifiers;
|
|||
|
|
|
|||
|
|
/* attach.c */
|
|||
|
|
struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum,
|
|||
|
|
int ec);
|
|||
|
|
void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);
|
|||
|
|
int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
|
|||
|
|
int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
|
|||
|
|
struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id);
|
|||
|
|
struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
|
|||
|
|
int vol_id);
|
|||
|
|
void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
|
|||
|
|
struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
|
|||
|
|
struct ubi_attach_info *ai);
|
|||
|
|
int ubi_attach(struct ubi_device *ubi, int force_scan);
|
|||
|
|
void ubi_destroy_ai(struct ubi_attach_info *ai);
|
|||
|
|
|
|||
|
|
/* vtbl.c */
|
|||
|
|
int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
|
|||
|
|
struct ubi_vtbl_record *vtbl_rec);
|
|||
|
|
int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
|
|||
|
|
struct list_head *rename_list);
|
|||
|
|
int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai);
|
|||
|
|
|
|||
|
|
/* vmt.c */
|
|||
|
|
int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req);
|
|||
|
|
int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl);
|
|||
|
|
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs);
|
|||
|
|
int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list);
|
|||
|
|
int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol);
|
|||
|
|
void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
|
|||
|
|
|
|||
|
|
/* upd.c */
|
|||
|
|
int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
long long bytes);
|
|||
|
|
int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
const void __user *buf, int count);
|
|||
|
|
int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
const struct ubi_leb_change_req *req);
|
|||
|
|
int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
const void __user *buf, int count);
|
|||
|
|
|
|||
|
|
/* misc.c */
|
|||
|
|
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
|
|||
|
|
int length);
|
|||
|
|
int ubi_check_volume(struct ubi_device *ubi, int vol_id);
|
|||
|
|
void ubi_update_reserved(struct ubi_device *ubi);
|
|||
|
|
void ubi_calculate_reserved(struct ubi_device *ubi);
|
|||
|
|
int ubi_check_pattern(const void *buf, uint8_t patt, int size);
|
|||
|
|
|
|||
|
|
static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum)
|
|||
|
|
{
|
|||
|
|
return lnum >= 0 && lnum < vol->reserved_pebs;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* eba.c */
|
|||
|
|
struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
|
|||
|
|
int nentries);
|
|||
|
|
void ubi_eba_destroy_table(struct ubi_eba_table *tbl);
|
|||
|
|
void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
|
|||
|
|
int nentries);
|
|||
|
|
void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl);
|
|||
|
|
void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
|
|||
|
|
struct ubi_eba_leb_desc *ldesc);
|
|||
|
|
bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum);
|
|||
|
|
int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
int lnum);
|
|||
|
|
int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
|
|||
|
|
void *buf, int offset, int len, int check);
|
|||
|
|
int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
struct ubi_sgl *sgl, int lnum, int offset, int len,
|
|||
|
|
int check);
|
|||
|
|
int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
|
|||
|
|
const void *buf, int offset, int len);
|
|||
|
|
int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
int lnum, const void *buf, int len, int used_ebs);
|
|||
|
|
int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
int lnum, const void *buf, int len);
|
|||
|
|
int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
|
|
struct ubi_vid_io_buf *vidb);
|
|||
|
|
int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
|
|||
|
|
unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
|
|||
|
|
int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
|
|||
|
|
struct ubi_attach_info *ai_scan);
|
|||
|
|
|
|||
|
|
/* wl.c */
|
|||
|
|
int ubi_wl_get_peb(struct ubi_device *ubi);
|
|||
|
|
int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum,
|
|||
|
|
int pnum, int torture);
|
|||
|
|
int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum);
|
|||
|
|
int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
|
|||
|
|
int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
|
|||
|
|
void ubi_wl_close(struct ubi_device *ubi);
|
|||
|
|
int ubi_thread(void *u);
|
|||
|
|
struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
|
|||
|
|
int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
|
|||
|
|
int lnum, int torture);
|
|||
|
|
int ubi_is_erase_work(struct ubi_work *wrk);
|
|||
|
|
void ubi_refill_pools(struct ubi_device *ubi);
|
|||
|
|
int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
|
|||
|
|
|
|||
|
|
/* io.c */
|
|||
|
|
int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
|
|||
|
|
int len);
|
|||
|
|
int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
|
|||
|
|
int len);
|
|||
|
|
int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture);
|
|||
|
|
int ubi_io_is_bad(const struct ubi_device *ubi, int pnum);
|
|||
|
|
int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum);
|
|||
|
|
int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
|
|||
|
|
struct ubi_ec_hdr *ec_hdr, int verbose);
|
|||
|
|
int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
|
|||
|
|
struct ubi_ec_hdr *ec_hdr);
|
|||
|
|
int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
|
|||
|
|
struct ubi_vid_io_buf *vidb, int verbose);
|
|||
|
|
int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
|
|||
|
|
struct ubi_vid_io_buf *vidb);
|
|||
|
|
|
|||
|
|
/* build.c */
|
|||
|
|
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
|
|||
|
|
int vid_hdr_offset, int max_beb_per1024);
|
|||
|
|
int ubi_detach_mtd_dev(int ubi_num, int anyway);
|
|||
|
|
struct ubi_device *ubi_get_device(int ubi_num);
|
|||
|
|
void ubi_put_device(struct ubi_device *ubi);
|
|||
|
|
struct ubi_device *ubi_get_by_major(int major);
|
|||
|
|
int ubi_major2num(int major);
|
|||
|
|
int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
int ntype);
|
|||
|
|
int ubi_notify_all(struct ubi_device *ubi, int ntype,
|
|||
|
|
struct notifier_block *nb);
|
|||
|
|
int ubi_enumerate_volumes(struct notifier_block *nb);
|
|||
|
|
void ubi_free_internal_volumes(struct ubi_device *ubi);
|
|||
|
|
|
|||
|
|
/* kapi.c */
|
|||
|
|
void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
|
|||
|
|
void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
|
|
struct ubi_volume_info *vi);
|
|||
|
|
/* scan.c */
|
|||
|
|
int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
|
|||
|
|
int pnum, const struct ubi_vid_hdr *vid_hdr);
|
|||
|
|
|
|||
|
|
/* fastmap.c */
|
|||
|
|
#ifdef CONFIG_MTD_UBI_FASTMAP
|
|||
|
|
size_t ubi_calc_fm_size(struct ubi_device *ubi);
|
|||
|
|
int ubi_update_fastmap(struct ubi_device *ubi);
|
|||
|
|
int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
|
|||
|
|
struct ubi_attach_info *scan_ai);
|
|||
|
|
int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count);
|
|||
|
|
void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol);
|
|||
|
|
#else
|
|||
|
|
static inline int ubi_update_fastmap(struct ubi_device *ubi) { return 0; }
|
|||
|
|
int static inline ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) { return 0; }
|
|||
|
|
static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {}
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
/* block.c */
|
|||
|
|
#ifdef CONFIG_MTD_UBI_BLOCK
|
|||
|
|
int ubiblock_init(void);
|
|||
|
|
void ubiblock_exit(void);
|
|||
|
|
int ubiblock_create(struct ubi_volume_info *vi);
|
|||
|
|
int ubiblock_remove(struct ubi_volume_info *vi);
|
|||
|
|
#else
|
|||
|
|
static inline int ubiblock_init(void) { return 0; }
|
|||
|
|
static inline void ubiblock_exit(void) {}
|
|||
|
|
static inline int ubiblock_create(struct ubi_volume_info *vi)
|
|||
|
|
{
|
|||
|
|
return -ENOSYS;
|
|||
|
|
}
|
|||
|
|
static inline int ubiblock_remove(struct ubi_volume_info *vi)
|
|||
|
|
{
|
|||
|
|
return -ENOSYS;
|
|||
|
|
}
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_for_each_free_peb - walk the UBI free RB tree.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @e: a pointer to a ubi_wl_entry to use as cursor
|
|||
|
|
* @pos: a pointer to RB-tree entry type to use as a loop counter
|
|||
|
|
*/
|
|||
|
|
#define ubi_for_each_free_peb(ubi, e, tmp_rb) \
|
|||
|
|
ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->free, u.rb)
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_for_each_used_peb - walk the UBI used RB tree.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @e: a pointer to a ubi_wl_entry to use as cursor
|
|||
|
|
* @pos: a pointer to RB-tree entry type to use as a loop counter
|
|||
|
|
*/
|
|||
|
|
#define ubi_for_each_used_peb(ubi, e, tmp_rb) \
|
|||
|
|
ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->used, u.rb)
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_for_each_scub_peb - walk the UBI scub RB tree.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @e: a pointer to a ubi_wl_entry to use as cursor
|
|||
|
|
* @pos: a pointer to RB-tree entry type to use as a loop counter
|
|||
|
|
*/
|
|||
|
|
#define ubi_for_each_scrub_peb(ubi, e, tmp_rb) \
|
|||
|
|
ubi_rb_for_each_entry((tmp_rb), (e), &(ubi)->scrub, u.rb)
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_for_each_protected_peb - walk the UBI protection queue.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @i: a integer used as counter
|
|||
|
|
* @e: a pointer to a ubi_wl_entry to use as cursor
|
|||
|
|
*/
|
|||
|
|
#define ubi_for_each_protected_peb(ubi, i, e) \
|
|||
|
|
for ((i) = 0; (i) < UBI_PROT_QUEUE_LEN; (i)++) \
|
|||
|
|
list_for_each_entry((e), &(ubi->pq[(i)]), u.list)
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_rb_for_each_entry - walk an RB-tree.
|
|||
|
|
* @rb: a pointer to type 'struct rb_node' to use as a loop counter
|
|||
|
|
* @pos: a pointer to RB-tree entry type to use as a loop counter
|
|||
|
|
* @root: RB-tree's root
|
|||
|
|
* @member: the name of the 'struct rb_node' within the RB-tree entry
|
|||
|
|
*/
|
|||
|
|
#define ubi_rb_for_each_entry(rb, pos, root, member) \
|
|||
|
|
for (rb = rb_first(root), \
|
|||
|
|
pos = (rb ? container_of(rb, typeof(*pos), member) : NULL); \
|
|||
|
|
rb; \
|
|||
|
|
rb = rb_next(rb), \
|
|||
|
|
pos = (rb ? container_of(rb, typeof(*pos), member) : NULL))
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ubi_move_aeb_to_list - move a PEB from the volume tree to a list.
|
|||
|
|
*
|
|||
|
|
* @av: volume attaching information
|
|||
|
|
* @aeb: attaching eraseblock information
|
|||
|
|
* @list: the list to move to
|
|||
|
|
*/
|
|||
|
|
static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av,
|
|||
|
|
struct ubi_ainf_peb *aeb,
|
|||
|
|
struct list_head *list)
|
|||
|
|
{
|
|||
|
|
rb_erase(&aeb->u.rb, &av->root);
|
|||
|
|
list_add_tail(&aeb->u.list, list);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_init_vid_buf - Initialize a VID buffer
|
|||
|
|
* @ubi: the UBI device
|
|||
|
|
* @vidb: the VID buffer to initialize
|
|||
|
|
* @buf: the underlying buffer
|
|||
|
|
*/
|
|||
|
|
static inline void ubi_init_vid_buf(const struct ubi_device *ubi,
|
|||
|
|
struct ubi_vid_io_buf *vidb,
|
|||
|
|
void *buf)
|
|||
|
|
{
|
|||
|
|
if (buf)
|
|||
|
|
memset(buf, 0, ubi->vid_hdr_alsize);
|
|||
|
|
|
|||
|
|
vidb->buffer = buf;
|
|||
|
|
vidb->hdr = buf + ubi->vid_hdr_shift;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_init_vid_buf - Allocate a VID buffer
|
|||
|
|
* @ubi: the UBI device
|
|||
|
|
* @gfp_flags: GFP flags to use for the allocation
|
|||
|
|
*/
|
|||
|
|
static inline struct ubi_vid_io_buf *
|
|||
|
|
ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags)
|
|||
|
|
{
|
|||
|
|
struct ubi_vid_io_buf *vidb;
|
|||
|
|
void *buf;
|
|||
|
|
|
|||
|
|
vidb = kzalloc(sizeof(*vidb), gfp_flags);
|
|||
|
|
if (!vidb)
|
|||
|
|
return NULL;
|
|||
|
|
|
|||
|
|
buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags);
|
|||
|
|
if (!buf) {
|
|||
|
|
kfree(vidb);
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
ubi_init_vid_buf(ubi, vidb, buf);
|
|||
|
|
|
|||
|
|
return vidb;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_free_vid_buf - Free a VID buffer
|
|||
|
|
* @vidb: the VID buffer to free
|
|||
|
|
*/
|
|||
|
|
static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb)
|
|||
|
|
{
|
|||
|
|
if (!vidb)
|
|||
|
|
return;
|
|||
|
|
|
|||
|
|
kfree(vidb->buffer);
|
|||
|
|
kfree(vidb);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_get_vid_hdr - Get the VID header attached to a VID buffer
|
|||
|
|
* @vidb: VID buffer
|
|||
|
|
*/
|
|||
|
|
static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb)
|
|||
|
|
{
|
|||
|
|
return vidb->hdr;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* This function is equivalent to 'ubi_io_read()', but @offset is relative to
|
|||
|
|
* the beginning of the logical eraseblock, not to the beginning of the
|
|||
|
|
* physical eraseblock.
|
|||
|
|
*/
|
|||
|
|
static inline int ubi_io_read_data(const struct ubi_device *ubi, void *buf,
|
|||
|
|
int pnum, int offset, int len)
|
|||
|
|
{
|
|||
|
|
ubi_assert(offset >= 0);
|
|||
|
|
return ubi_io_read(ubi, buf, pnum, offset + ubi->leb_start, len);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* This function is equivalent to 'ubi_io_write()', but @offset is relative to
|
|||
|
|
* the beginning of the logical eraseblock, not to the beginning of the
|
|||
|
|
* physical eraseblock.
|
|||
|
|
*/
|
|||
|
|
static inline int ubi_io_write_data(struct ubi_device *ubi, const void *buf,
|
|||
|
|
int pnum, int offset, int len)
|
|||
|
|
{
|
|||
|
|
ubi_assert(offset >= 0);
|
|||
|
|
return ubi_io_write(ubi, buf, pnum, offset + ubi->leb_start, len);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_ro_mode - switch to read-only mode.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
*/
|
|||
|
|
static inline void ubi_ro_mode(struct ubi_device *ubi)
|
|||
|
|
{
|
|||
|
|
if (!ubi->ro_mode) {
|
|||
|
|
ubi->ro_mode = 1;
|
|||
|
|
ubi_warn(ubi, "switch to read-only mode");
|
|||
|
|
dump_stack();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* vol_id2idx - get table index by volume ID.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @vol_id: volume ID
|
|||
|
|
*/
|
|||
|
|
static inline int vol_id2idx(const struct ubi_device *ubi, int vol_id)
|
|||
|
|
{
|
|||
|
|
if (vol_id >= UBI_INTERNAL_VOL_START)
|
|||
|
|
return vol_id - UBI_INTERNAL_VOL_START + ubi->vtbl_slots;
|
|||
|
|
else
|
|||
|
|
return vol_id;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* idx2vol_id - get volume ID by table index.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @idx: table index
|
|||
|
|
*/
|
|||
|
|
static inline int idx2vol_id(const struct ubi_device *ubi, int idx)
|
|||
|
|
{
|
|||
|
|
if (idx >= ubi->vtbl_slots)
|
|||
|
|
return idx - ubi->vtbl_slots + UBI_INTERNAL_VOL_START;
|
|||
|
|
else
|
|||
|
|
return idx;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_is_fm_vol - check whether a volume ID is a Fastmap volume.
|
|||
|
|
* @vol_id: volume ID
|
|||
|
|
*/
|
|||
|
|
static inline bool ubi_is_fm_vol(int vol_id)
|
|||
|
|
{
|
|||
|
|
switch (vol_id) {
|
|||
|
|
case UBI_FM_SB_VOLUME_ID:
|
|||
|
|
case UBI_FM_DATA_VOLUME_ID:
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* ubi_find_fm_block - check whether a PEB is part of the current Fastmap.
|
|||
|
|
* @ubi: UBI device description object
|
|||
|
|
* @pnum: physical eraseblock to look for
|
|||
|
|
*
|
|||
|
|
* This function returns a wear leveling object if @pnum relates to the current
|
|||
|
|
* fastmap, @NULL otherwise.
|
|||
|
|
*/
|
|||
|
|
static inline struct ubi_wl_entry *ubi_find_fm_block(const struct ubi_device *ubi,
|
|||
|
|
int pnum)
|
|||
|
|
{
|
|||
|
|
int i;
|
|||
|
|
|
|||
|
|
if (ubi->fm) {
|
|||
|
|
for (i = 0; i < ubi->fm->used_blocks; i++) {
|
|||
|
|
if (ubi->fm->e[i]->pnum == pnum)
|
|||
|
|
return ubi->fm->e[i];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* !__UBI_UBI_H__ */
|