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![Martin Kaistra](/assets/img/avatar_default.png)
The types of "offset" and "size" of "struct mtd_partition" are uint64_t, while mtd_parse_partitions() uses int to work with these values. When the offset reaches 2GB, it is interpreted as a negative value, which leads to error messages like mtd: partition "<partition name>" is out of reach -- disabled eg. when using the "ubi part" command. Fix this by using uint64_t for cur_off and cur_sz. Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> Reviewed-by: Heiko Schocher <hs@denx.de>
1001 lines
26 KiB
C
1001 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Simple MTD partitioning layer
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*
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* Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
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* Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
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* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
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*
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*/
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#ifndef __UBOOT__
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#include <log.h>
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#include <dm/devres.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/kmod.h>
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#endif
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#include <common.h>
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#include <malloc.h>
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <linux/compat.h>
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#include <ubi_uboot.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/err.h>
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#include <linux/sizes.h>
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#include "mtdcore.h"
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#ifndef __UBOOT__
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static DEFINE_MUTEX(mtd_partitions_mutex);
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#else
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DEFINE_MUTEX(mtd_partitions_mutex);
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#endif
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#ifdef __UBOOT__
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/* from mm/util.c */
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/**
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* kstrdup - allocate space for and copy an existing string
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* @s: the string to duplicate
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* @gfp: the GFP mask used in the kmalloc() call when allocating memory
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*/
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char *kstrdup(const char *s, gfp_t gfp)
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{
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size_t len;
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char *buf;
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if (!s)
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return NULL;
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len = strlen(s) + 1;
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buf = kmalloc(len, gfp);
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if (buf)
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memcpy(buf, s, len);
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return buf;
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}
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#endif
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#define MTD_SIZE_REMAINING (~0LLU)
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#define MTD_OFFSET_NOT_SPECIFIED (~0LLU)
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bool mtd_partitions_used(struct mtd_info *master)
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{
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struct mtd_info *slave;
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list_for_each_entry(slave, &master->partitions, node) {
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if (slave->usecount)
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return true;
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}
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return false;
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}
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/**
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* mtd_parse_partition - Parse @mtdparts partition definition, fill @partition
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* with it and update the @mtdparts string pointer.
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*
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* The partition name is allocated and must be freed by the caller.
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*
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* This function is widely inspired from part_parse (mtdparts.c).
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*
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* @mtdparts: String describing the partition with mtdparts command syntax
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* @partition: MTD partition structure to fill
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*
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* @return 0 on success, an error otherwise.
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*/
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static int mtd_parse_partition(const char **_mtdparts,
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struct mtd_partition *partition)
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{
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const char *mtdparts = *_mtdparts;
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const char *name = NULL;
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int name_len;
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char *buf;
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/* Ensure the partition structure is empty */
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memset(partition, 0, sizeof(struct mtd_partition));
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/* Fetch the partition size */
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if (*mtdparts == '-') {
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/* Assign all remaining space to this partition */
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partition->size = MTD_SIZE_REMAINING;
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mtdparts++;
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} else {
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partition->size = ustrtoull(mtdparts, (char **)&mtdparts, 0);
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if (partition->size < SZ_4K) {
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printf("Minimum partition size 4kiB, %lldB requested\n",
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partition->size);
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return -EINVAL;
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}
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}
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/* Check for the offset */
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partition->offset = MTD_OFFSET_NOT_SPECIFIED;
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if (*mtdparts == '@') {
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mtdparts++;
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partition->offset = ustrtoull(mtdparts, (char **)&mtdparts, 0);
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}
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/* Now look for the name */
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if (*mtdparts == '(') {
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name = ++mtdparts;
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mtdparts = strchr(name, ')');
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if (!mtdparts) {
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printf("No closing ')' found in partition name\n");
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return -EINVAL;
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}
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name_len = mtdparts - name + 1;
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if ((name_len - 1) == 0) {
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printf("Empty partition name\n");
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return -EINVAL;
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}
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mtdparts++;
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} else {
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/* Name will be of the form size@offset */
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name_len = 22;
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}
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/* Check if the partition is read-only */
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if (strncmp(mtdparts, "ro", 2) == 0) {
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partition->mask_flags |= MTD_WRITEABLE;
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mtdparts += 2;
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}
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/* Check for a potential next partition definition */
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if (*mtdparts == ',') {
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if (partition->size == MTD_SIZE_REMAINING) {
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printf("No partitions allowed after a fill-up\n");
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return -EINVAL;
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}
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++mtdparts;
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} else if ((*mtdparts == ';') || (*mtdparts == '\0')) {
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/* NOP */
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} else {
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printf("Unexpected character '%c' in mtdparts\n", *mtdparts);
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return -EINVAL;
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}
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/*
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* Allocate a buffer for the name and either copy the provided name or
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* auto-generate it with the form 'size@offset'.
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*/
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buf = malloc(name_len);
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if (!buf)
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return -ENOMEM;
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if (name)
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strncpy(buf, name, name_len - 1);
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else
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snprintf(buf, name_len, "0x%08llx@0x%08llx",
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partition->size, partition->offset);
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buf[name_len - 1] = '\0';
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partition->name = buf;
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*_mtdparts = mtdparts;
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return 0;
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}
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/**
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* mtd_parse_partitions - Create a partition array from an mtdparts definition
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*
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* Stateless function that takes a @parent MTD device, a string @_mtdparts
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* describing the partitions (with the "mtdparts" command syntax) and creates
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* the corresponding MTD partition structure array @_parts. Both the name and
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* the structure partition itself must be freed freed, the caller may use
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* @mtd_free_parsed_partitions() for this purpose.
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*
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* @parent: MTD device which contains the partitions
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* @_mtdparts: Pointer to a string describing the partitions with "mtdparts"
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* command syntax.
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* @_parts: Allocated array containing the partitions, must be freed by the
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* caller.
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* @_nparts: Size of @_parts array.
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*
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* @return 0 on success, an error otherwise.
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*/
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int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
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struct mtd_partition **_parts, int *_nparts)
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{
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struct mtd_partition partition = {}, *parts;
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const char *mtdparts = *_mtdparts;
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uint64_t cur_off = 0, cur_sz = 0;
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int nparts = 0;
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int ret, idx;
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u64 sz;
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/* First, iterate over the partitions until we know their number */
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while (mtdparts[0] != '\0' && mtdparts[0] != ';') {
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ret = mtd_parse_partition(&mtdparts, &partition);
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if (ret)
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return ret;
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free((char *)partition.name);
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nparts++;
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}
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/* Allocate an array of partitions to give back to the caller */
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parts = malloc(sizeof(*parts) * nparts);
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if (!parts) {
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printf("Not enough space to save partitions meta-data\n");
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return -ENOMEM;
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}
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/* Iterate again over each partition to save the data in our array */
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for (idx = 0; idx < nparts; idx++) {
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ret = mtd_parse_partition(_mtdparts, &parts[idx]);
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if (ret)
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return ret;
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if (parts[idx].size == MTD_SIZE_REMAINING)
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parts[idx].size = parent->size - cur_sz;
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cur_sz += parts[idx].size;
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sz = parts[idx].size;
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if (sz < parent->writesize || do_div(sz, parent->writesize)) {
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printf("Partition size must be a multiple of %d\n",
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parent->writesize);
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return -EINVAL;
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}
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if (parts[idx].offset == MTD_OFFSET_NOT_SPECIFIED)
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parts[idx].offset = cur_off;
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cur_off += parts[idx].size;
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parts[idx].ecclayout = parent->ecclayout;
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}
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/* Offset by one mtdparts to point to the next device if any */
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if (*_mtdparts[0] == ';')
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(*_mtdparts)++;
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*_parts = parts;
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*_nparts = nparts;
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return 0;
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}
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/**
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* mtd_free_parsed_partitions - Free dynamically allocated partitions
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*
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* Each successful call to @mtd_parse_partitions must be followed by a call to
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* @mtd_free_parsed_partitions to free any allocated array during the parsing
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* process.
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*
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* @parts: Array containing the partitions that will be freed.
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* @nparts: Size of @parts array.
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*/
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void mtd_free_parsed_partitions(struct mtd_partition *parts,
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unsigned int nparts)
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{
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int i;
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for (i = 0; i < nparts; i++)
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free((char *)parts[i].name);
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free(parts);
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}
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/*
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* MTD methods which simply translate the effective address and pass through
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* to the _real_ device.
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*/
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static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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struct mtd_ecc_stats stats;
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int res;
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stats = mtd->parent->ecc_stats;
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res = mtd->parent->_read(mtd->parent, from + mtd->offset, len,
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retlen, buf);
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if (unlikely(mtd_is_eccerr(res)))
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mtd->ecc_stats.failed +=
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mtd->parent->ecc_stats.failed - stats.failed;
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else
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mtd->ecc_stats.corrected +=
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mtd->parent->ecc_stats.corrected - stats.corrected;
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return res;
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}
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#ifndef __UBOOT__
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static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, void **virt, resource_size_t *phys)
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{
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return mtd->parent->_point(mtd->parent, from + mtd->offset, len,
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retlen, virt, phys);
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}
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static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
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{
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return mtd->parent->_unpoint(mtd->parent, from + mtd->offset, len);
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}
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#endif
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static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
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unsigned long len,
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unsigned long offset,
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unsigned long flags)
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{
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offset += mtd->offset;
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return mtd->parent->_get_unmapped_area(mtd->parent, len, offset, flags);
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}
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static int part_read_oob(struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops)
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{
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int res;
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if (from >= mtd->size)
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return -EINVAL;
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if (ops->datbuf && from + ops->len > mtd->size)
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return -EINVAL;
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/*
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* If OOB is also requested, make sure that we do not read past the end
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* of this partition.
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*/
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if (ops->oobbuf) {
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size_t len, pages;
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if (ops->mode == MTD_OPS_AUTO_OOB)
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len = mtd->oobavail;
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else
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len = mtd->oobsize;
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pages = mtd_div_by_ws(mtd->size, mtd);
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pages -= mtd_div_by_ws(from, mtd);
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if (ops->ooboffs + ops->ooblen > pages * len)
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return -EINVAL;
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}
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res = mtd->parent->_read_oob(mtd->parent, from + mtd->offset, ops);
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if (unlikely(res)) {
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if (mtd_is_bitflip(res))
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mtd->ecc_stats.corrected++;
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if (mtd_is_eccerr(res))
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mtd->ecc_stats.failed++;
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}
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return res;
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}
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static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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return mtd->parent->_read_user_prot_reg(mtd->parent, from, len,
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retlen, buf);
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}
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static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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return mtd->parent->_get_user_prot_info(mtd->parent, len, retlen,
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buf);
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}
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static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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return mtd->parent->_read_fact_prot_reg(mtd->parent, from, len,
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retlen, buf);
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}
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static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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return mtd->parent->_get_fact_prot_info(mtd->parent, len, retlen,
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buf);
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}
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static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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return mtd->parent->_write(mtd->parent, to + mtd->offset, len,
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retlen, buf);
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}
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static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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return mtd->parent->_panic_write(mtd->parent, to + mtd->offset, len,
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retlen, buf);
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}
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static int part_write_oob(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops)
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{
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if (to >= mtd->size)
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return -EINVAL;
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if (ops->datbuf && to + ops->len > mtd->size)
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return -EINVAL;
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return mtd->parent->_write_oob(mtd->parent, to + mtd->offset, ops);
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}
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static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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return mtd->parent->_write_user_prot_reg(mtd->parent, from, len,
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retlen, buf);
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}
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static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len)
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{
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return mtd->parent->_lock_user_prot_reg(mtd->parent, from, len);
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}
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#ifndef __UBOOT__
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static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen)
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{
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return mtd->parent->_writev(mtd->parent, vecs, count,
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to + mtd->offset, retlen);
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}
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#endif
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static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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int ret;
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instr->addr += mtd->offset;
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ret = mtd->parent->_erase(mtd->parent, instr);
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if (ret) {
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if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr -= mtd->offset;
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instr->addr -= mtd->offset;
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}
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return ret;
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}
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void mtd_erase_callback(struct erase_info *instr)
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{
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if (instr->mtd->_erase == part_erase) {
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if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr -= instr->mtd->offset;
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instr->addr -= instr->mtd->offset;
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}
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if (instr->callback)
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instr->callback(instr);
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}
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EXPORT_SYMBOL_GPL(mtd_erase_callback);
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static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->parent->_lock(mtd->parent, ofs + mtd->offset, len);
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}
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static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->parent->_unlock(mtd->parent, ofs + mtd->offset, len);
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}
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static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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return mtd->parent->_is_locked(mtd->parent, ofs + mtd->offset, len);
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}
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static void part_sync(struct mtd_info *mtd)
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{
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mtd->parent->_sync(mtd->parent);
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}
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#ifndef __UBOOT__
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static int part_suspend(struct mtd_info *mtd)
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{
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return mtd->parent->_suspend(mtd->parent);
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}
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static void part_resume(struct mtd_info *mtd)
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{
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mtd->parent->_resume(mtd->parent);
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}
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#endif
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static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
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{
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ofs += mtd->offset;
|
|
return mtd->parent->_block_isreserved(mtd->parent, ofs);
|
|
}
|
|
|
|
static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
ofs += mtd->offset;
|
|
return mtd->parent->_block_isbad(mtd->parent, ofs);
|
|
}
|
|
|
|
static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
int res;
|
|
|
|
ofs += mtd->offset;
|
|
res = mtd->parent->_block_markbad(mtd->parent, ofs);
|
|
if (!res)
|
|
mtd->ecc_stats.badblocks++;
|
|
return res;
|
|
}
|
|
|
|
static inline void free_partition(struct mtd_info *p)
|
|
{
|
|
kfree(p->name);
|
|
kfree(p);
|
|
}
|
|
|
|
/*
|
|
* This function unregisters and destroy all slave MTD objects which are
|
|
* attached to the given master MTD object, recursively.
|
|
*/
|
|
static int do_del_mtd_partitions(struct mtd_info *master)
|
|
{
|
|
struct mtd_info *slave, *next;
|
|
int ret, err = 0;
|
|
|
|
list_for_each_entry_safe(slave, next, &master->partitions, node) {
|
|
if (mtd_has_partitions(slave))
|
|
del_mtd_partitions(slave);
|
|
|
|
debug("Deleting %s MTD partition\n", slave->name);
|
|
ret = del_mtd_device(slave);
|
|
if (ret < 0) {
|
|
printf("Error when deleting partition \"%s\" (%d)\n",
|
|
slave->name, ret);
|
|
err = ret;
|
|
continue;
|
|
}
|
|
|
|
list_del(&slave->node);
|
|
free_partition(slave);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int del_mtd_partitions(struct mtd_info *master)
|
|
{
|
|
int ret;
|
|
|
|
debug("Deleting MTD partitions on \"%s\":\n", master->name);
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
ret = do_del_mtd_partitions(master);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct mtd_info *allocate_partition(struct mtd_info *master,
|
|
const struct mtd_partition *part,
|
|
int partno, uint64_t cur_offset)
|
|
{
|
|
struct mtd_info *slave;
|
|
char *name;
|
|
|
|
/* allocate the partition structure */
|
|
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
|
|
name = kstrdup(part->name, GFP_KERNEL);
|
|
if (!name || !slave) {
|
|
printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
|
|
master->name);
|
|
kfree(name);
|
|
kfree(slave);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/* set up the MTD object for this partition */
|
|
slave->type = master->type;
|
|
slave->flags = master->flags & ~part->mask_flags;
|
|
slave->size = part->size;
|
|
slave->writesize = master->writesize;
|
|
slave->writebufsize = master->writebufsize;
|
|
slave->oobsize = master->oobsize;
|
|
slave->oobavail = master->oobavail;
|
|
slave->subpage_sft = master->subpage_sft;
|
|
|
|
slave->name = name;
|
|
slave->owner = master->owner;
|
|
#ifndef __UBOOT__
|
|
slave->backing_dev_info = master->backing_dev_info;
|
|
|
|
/* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
|
|
* to have the same data be in two different partitions.
|
|
*/
|
|
slave->dev.parent = master->dev.parent;
|
|
#endif
|
|
|
|
if (master->_read)
|
|
slave->_read = part_read;
|
|
if (master->_write)
|
|
slave->_write = part_write;
|
|
|
|
if (master->_panic_write)
|
|
slave->_panic_write = part_panic_write;
|
|
|
|
#ifndef __UBOOT__
|
|
if (master->_point && master->_unpoint) {
|
|
slave->_point = part_point;
|
|
slave->_unpoint = part_unpoint;
|
|
}
|
|
#endif
|
|
|
|
if (master->_get_unmapped_area)
|
|
slave->_get_unmapped_area = part_get_unmapped_area;
|
|
if (master->_read_oob)
|
|
slave->_read_oob = part_read_oob;
|
|
if (master->_write_oob)
|
|
slave->_write_oob = part_write_oob;
|
|
if (master->_read_user_prot_reg)
|
|
slave->_read_user_prot_reg = part_read_user_prot_reg;
|
|
if (master->_read_fact_prot_reg)
|
|
slave->_read_fact_prot_reg = part_read_fact_prot_reg;
|
|
if (master->_write_user_prot_reg)
|
|
slave->_write_user_prot_reg = part_write_user_prot_reg;
|
|
if (master->_lock_user_prot_reg)
|
|
slave->_lock_user_prot_reg = part_lock_user_prot_reg;
|
|
if (master->_get_user_prot_info)
|
|
slave->_get_user_prot_info = part_get_user_prot_info;
|
|
if (master->_get_fact_prot_info)
|
|
slave->_get_fact_prot_info = part_get_fact_prot_info;
|
|
if (master->_sync)
|
|
slave->_sync = part_sync;
|
|
#ifndef __UBOOT__
|
|
if (!partno && !master->dev.class && master->_suspend &&
|
|
master->_resume) {
|
|
slave->_suspend = part_suspend;
|
|
slave->_resume = part_resume;
|
|
}
|
|
if (master->_writev)
|
|
slave->_writev = part_writev;
|
|
#endif
|
|
if (master->_lock)
|
|
slave->_lock = part_lock;
|
|
if (master->_unlock)
|
|
slave->_unlock = part_unlock;
|
|
if (master->_is_locked)
|
|
slave->_is_locked = part_is_locked;
|
|
if (master->_block_isreserved)
|
|
slave->_block_isreserved = part_block_isreserved;
|
|
if (master->_block_isbad)
|
|
slave->_block_isbad = part_block_isbad;
|
|
if (master->_block_markbad)
|
|
slave->_block_markbad = part_block_markbad;
|
|
slave->_erase = part_erase;
|
|
slave->parent = master;
|
|
slave->offset = part->offset;
|
|
INIT_LIST_HEAD(&slave->partitions);
|
|
INIT_LIST_HEAD(&slave->node);
|
|
|
|
if (slave->offset == MTDPART_OFS_APPEND)
|
|
slave->offset = cur_offset;
|
|
if (slave->offset == MTDPART_OFS_NXTBLK) {
|
|
slave->offset = cur_offset;
|
|
if (mtd_mod_by_eb(cur_offset, master) != 0) {
|
|
/* Round up to next erasesize */
|
|
slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
|
|
debug("Moving partition %d: "
|
|
"0x%012llx -> 0x%012llx\n", partno,
|
|
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
|
|
}
|
|
}
|
|
if (slave->offset == MTDPART_OFS_RETAIN) {
|
|
slave->offset = cur_offset;
|
|
if (master->size - slave->offset >= slave->size) {
|
|
slave->size = master->size - slave->offset
|
|
- slave->size;
|
|
} else {
|
|
debug("mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
|
|
part->name, master->size - slave->offset,
|
|
slave->size);
|
|
/* register to preserve ordering */
|
|
goto out_register;
|
|
}
|
|
}
|
|
if (slave->size == MTDPART_SIZ_FULL)
|
|
slave->size = master->size - slave->offset;
|
|
|
|
debug("0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
|
|
(unsigned long long)(slave->offset + slave->size), slave->name);
|
|
|
|
/* let's do some sanity checks */
|
|
if (slave->offset >= master->size) {
|
|
/* let's register it anyway to preserve ordering */
|
|
slave->offset = 0;
|
|
slave->size = 0;
|
|
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
|
|
part->name);
|
|
goto out_register;
|
|
}
|
|
if (slave->offset + slave->size > master->size) {
|
|
slave->size = master->size - slave->offset;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
|
|
part->name, master->name, slave->size);
|
|
}
|
|
if (master->numeraseregions > 1) {
|
|
/* Deal with variable erase size stuff */
|
|
int i, max = master->numeraseregions;
|
|
u64 end = slave->offset + slave->size;
|
|
struct mtd_erase_region_info *regions = master->eraseregions;
|
|
|
|
/* Find the first erase regions which is part of this
|
|
* partition. */
|
|
for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
|
|
;
|
|
/* The loop searched for the region _behind_ the first one */
|
|
if (i > 0)
|
|
i--;
|
|
|
|
/* Pick biggest erasesize */
|
|
for (; i < max && regions[i].offset < end; i++) {
|
|
if (slave->erasesize < regions[i].erasesize)
|
|
slave->erasesize = regions[i].erasesize;
|
|
}
|
|
WARN_ON(slave->erasesize == 0);
|
|
} else {
|
|
/* Single erase size */
|
|
slave->erasesize = master->erasesize;
|
|
}
|
|
|
|
if ((slave->flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->offset, slave)) {
|
|
/* Doesn't start on a boundary of major erase size */
|
|
/* FIXME: Let it be writable if it is on a boundary of
|
|
* _minor_ erase size though */
|
|
slave->flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
|
part->name);
|
|
}
|
|
if ((slave->flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->size, slave)) {
|
|
slave->flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
|
part->name);
|
|
}
|
|
|
|
slave->ecclayout = master->ecclayout;
|
|
slave->ecc_step_size = master->ecc_step_size;
|
|
slave->ecc_strength = master->ecc_strength;
|
|
slave->bitflip_threshold = master->bitflip_threshold;
|
|
|
|
if (master->_block_isbad) {
|
|
uint64_t offs = 0;
|
|
|
|
while (offs < slave->size) {
|
|
if (mtd_block_isbad(master, offs + slave->offset))
|
|
slave->ecc_stats.badblocks++;
|
|
offs += slave->erasesize;
|
|
}
|
|
}
|
|
|
|
out_register:
|
|
return slave;
|
|
}
|
|
|
|
#ifndef __UBOOT__
|
|
int mtd_add_partition(struct mtd_info *master, const char *name,
|
|
long long offset, long long length)
|
|
{
|
|
struct mtd_partition part;
|
|
struct mtd_info *p, *new;
|
|
uint64_t start, end;
|
|
int ret = 0;
|
|
|
|
/* the direct offset is expected */
|
|
if (offset == MTDPART_OFS_APPEND ||
|
|
offset == MTDPART_OFS_NXTBLK)
|
|
return -EINVAL;
|
|
|
|
if (length == MTDPART_SIZ_FULL)
|
|
length = master->size - offset;
|
|
|
|
if (length <= 0)
|
|
return -EINVAL;
|
|
|
|
part.name = name;
|
|
part.size = length;
|
|
part.offset = offset;
|
|
part.mask_flags = 0;
|
|
part.ecclayout = NULL;
|
|
|
|
new = allocate_partition(master, &part, -1, offset);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
|
|
start = offset;
|
|
end = offset + length;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry(p, &master->partitions, node) {
|
|
if (start >= p->offset &&
|
|
(start < (p->offset + p->size)))
|
|
goto err_inv;
|
|
|
|
if (end >= p->offset &&
|
|
(end < (p->offset + p->size)))
|
|
goto err_inv;
|
|
}
|
|
|
|
list_add_tail(&new->node, &master->partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(new);
|
|
|
|
return ret;
|
|
err_inv:
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
free_partition(new);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_add_partition);
|
|
|
|
int mtd_del_partition(struct mtd_info *master, int partno)
|
|
{
|
|
struct mtd_info *slave, *next;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry_safe(slave, next, &master->partitions, node)
|
|
if (slave->index == partno) {
|
|
ret = del_mtd_device(slave);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
list_del(&slave->node);
|
|
free_partition(slave);
|
|
break;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_del_partition);
|
|
#endif
|
|
|
|
/*
|
|
* This function, given a master MTD object and a partition table, creates
|
|
* and registers slave MTD objects which are bound to the master according to
|
|
* the partition definitions.
|
|
*
|
|
* We don't register the master, or expect the caller to have done so,
|
|
* for reasons of data integrity.
|
|
*/
|
|
|
|
int add_mtd_partitions(struct mtd_info *master,
|
|
const struct mtd_partition *parts,
|
|
int nbparts)
|
|
{
|
|
struct mtd_info *slave;
|
|
uint64_t cur_offset = 0;
|
|
int i;
|
|
|
|
debug("Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
|
|
|
|
for (i = 0; i < nbparts; i++) {
|
|
slave = allocate_partition(master, parts + i, i, cur_offset);
|
|
if (IS_ERR(slave))
|
|
return PTR_ERR(slave);
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_add_tail(&slave->node, &master->partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(slave);
|
|
|
|
cur_offset = slave->offset + slave->size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifndef __UBOOT__
|
|
static DEFINE_SPINLOCK(part_parser_lock);
|
|
static LIST_HEAD(part_parsers);
|
|
|
|
static struct mtd_part_parser *get_partition_parser(const char *name)
|
|
{
|
|
struct mtd_part_parser *p, *ret = NULL;
|
|
|
|
spin_lock(&part_parser_lock);
|
|
|
|
list_for_each_entry(p, &part_parsers, list)
|
|
if (!strcmp(p->name, name) && try_module_get(p->owner)) {
|
|
ret = p;
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
|
|
|
|
void register_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_add(&p->list, &part_parsers);
|
|
spin_unlock(&part_parser_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_mtd_parser);
|
|
|
|
void deregister_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_del(&p->list);
|
|
spin_unlock(&part_parser_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
|
|
|
|
/*
|
|
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
|
|
* are changing this array!
|
|
*/
|
|
static const char * const default_mtd_part_types[] = {
|
|
"cmdlinepart",
|
|
"ofpart",
|
|
NULL
|
|
};
|
|
|
|
/**
|
|
* parse_mtd_partitions - parse MTD partitions
|
|
* @master: the master partition (describes whole MTD device)
|
|
* @types: names of partition parsers to try or %NULL
|
|
* @pparts: array of partitions found is returned here
|
|
* @data: MTD partition parser-specific data
|
|
*
|
|
* This function tries to find partition on MTD device @master. It uses MTD
|
|
* partition parsers, specified in @types. However, if @types is %NULL, then
|
|
* the default list of parsers is used. The default list contains only the
|
|
* "cmdlinepart" and "ofpart" parsers ATM.
|
|
* Note: If there are more then one parser in @types, the kernel only takes the
|
|
* partitions parsed out by the first parser.
|
|
*
|
|
* This function may return:
|
|
* o a negative error code in case of failure
|
|
* o zero if no partitions were found
|
|
* o a positive number of found partitions, in which case on exit @pparts will
|
|
* point to an array containing this number of &struct mtd_info objects.
|
|
*/
|
|
int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
|
|
struct mtd_partition **pparts,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_part_parser *parser;
|
|
int ret = 0;
|
|
|
|
if (!types)
|
|
types = default_mtd_part_types;
|
|
|
|
for ( ; ret <= 0 && *types; types++) {
|
|
parser = get_partition_parser(*types);
|
|
if (!parser && !request_module("%s", *types))
|
|
parser = get_partition_parser(*types);
|
|
if (!parser)
|
|
continue;
|
|
ret = (*parser->parse_fn)(master, pparts, data);
|
|
put_partition_parser(parser);
|
|
if (ret > 0) {
|
|
printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
|
|
ret, parser->name, master->name);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/* Returns the size of the entire flash chip */
|
|
uint64_t mtd_get_device_size(const struct mtd_info *mtd)
|
|
{
|
|
if (mtd_is_partition(mtd))
|
|
return mtd->parent->size;
|
|
|
|
return mtd->size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_device_size);
|