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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Simple MTD partitioning layer
- *
- * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
- * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
- * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
- *
- */
- #ifndef __UBOOT__
- #include <log.h>
- #include <dm/devres.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/list.h>
- #include <linux/kmod.h>
- #endif
- #include <common.h>
- #include <malloc.h>
- #include <linux/bug.h>
- #include <linux/errno.h>
- #include <linux/compat.h>
- #include <ubi_uboot.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
- #include <linux/err.h>
- #include <linux/sizes.h>
- #include "mtdcore.h"
- #ifndef __UBOOT__
- static DEFINE_MUTEX(mtd_partitions_mutex);
- #else
- DEFINE_MUTEX(mtd_partitions_mutex);
- #endif
- #ifdef __UBOOT__
- /* from mm/util.c */
- /**
- * kstrdup - allocate space for and copy an existing string
- * @s: the string to duplicate
- * @gfp: the GFP mask used in the kmalloc() call when allocating memory
- */
- char *kstrdup(const char *s, gfp_t gfp)
- {
- size_t len;
- char *buf;
- if (!s)
- return NULL;
- len = strlen(s) + 1;
- buf = kmalloc(len, gfp);
- if (buf)
- memcpy(buf, s, len);
- return buf;
- }
- #endif
- #define MTD_SIZE_REMAINING (~0LLU)
- #define MTD_OFFSET_NOT_SPECIFIED (~0LLU)
- bool mtd_partitions_used(struct mtd_info *master)
- {
- struct mtd_info *slave;
- list_for_each_entry(slave, &master->partitions, node) {
- if (slave->usecount)
- return true;
- }
- return false;
- }
- /**
- * mtd_parse_partition - Parse @mtdparts partition definition, fill @partition
- * with it and update the @mtdparts string pointer.
- *
- * The partition name is allocated and must be freed by the caller.
- *
- * This function is widely inspired from part_parse (mtdparts.c).
- *
- * @mtdparts: String describing the partition with mtdparts command syntax
- * @partition: MTD partition structure to fill
- *
- * @return 0 on success, an error otherwise.
- */
- static int mtd_parse_partition(const char **_mtdparts,
- struct mtd_partition *partition)
- {
- const char *mtdparts = *_mtdparts;
- const char *name = NULL;
- int name_len;
- char *buf;
- /* Ensure the partition structure is empty */
- memset(partition, 0, sizeof(struct mtd_partition));
- /* Fetch the partition size */
- if (*mtdparts == '-') {
- /* Assign all remaining space to this partition */
- partition->size = MTD_SIZE_REMAINING;
- mtdparts++;
- } else {
- partition->size = ustrtoull(mtdparts, (char **)&mtdparts, 0);
- if (partition->size < SZ_4K) {
- printf("Minimum partition size 4kiB, %lldB requested\n",
- partition->size);
- return -EINVAL;
- }
- }
- /* Check for the offset */
- partition->offset = MTD_OFFSET_NOT_SPECIFIED;
- if (*mtdparts == '@') {
- mtdparts++;
- partition->offset = ustrtoull(mtdparts, (char **)&mtdparts, 0);
- }
- /* Now look for the name */
- if (*mtdparts == '(') {
- name = ++mtdparts;
- mtdparts = strchr(name, ')');
- if (!mtdparts) {
- printf("No closing ')' found in partition name\n");
- return -EINVAL;
- }
- name_len = mtdparts - name + 1;
- if ((name_len - 1) == 0) {
- printf("Empty partition name\n");
- return -EINVAL;
- }
- mtdparts++;
- } else {
- /* Name will be of the form size@offset */
- name_len = 22;
- }
- /* Check if the partition is read-only */
- if (strncmp(mtdparts, "ro", 2) == 0) {
- partition->mask_flags |= MTD_WRITEABLE;
- mtdparts += 2;
- }
- /* Check for a potential next partition definition */
- if (*mtdparts == ',') {
- if (partition->size == MTD_SIZE_REMAINING) {
- printf("No partitions allowed after a fill-up\n");
- return -EINVAL;
- }
- ++mtdparts;
- } else if ((*mtdparts == ';') || (*mtdparts == '\0')) {
- /* NOP */
- } else {
- printf("Unexpected character '%c' in mtdparts\n", *mtdparts);
- return -EINVAL;
- }
- /*
- * Allocate a buffer for the name and either copy the provided name or
- * auto-generate it with the form 'size@offset'.
- */
- buf = malloc(name_len);
- if (!buf)
- return -ENOMEM;
- if (name)
- strncpy(buf, name, name_len - 1);
- else
- snprintf(buf, name_len, "0x%08llx@0x%08llx",
- partition->size, partition->offset);
- buf[name_len - 1] = '\0';
- partition->name = buf;
- *_mtdparts = mtdparts;
- return 0;
- }
- /**
- * mtd_parse_partitions - Create a partition array from an mtdparts definition
- *
- * Stateless function that takes a @parent MTD device, a string @_mtdparts
- * describing the partitions (with the "mtdparts" command syntax) and creates
- * the corresponding MTD partition structure array @_parts. Both the name and
- * the structure partition itself must be freed freed, the caller may use
- * @mtd_free_parsed_partitions() for this purpose.
- *
- * @parent: MTD device which contains the partitions
- * @_mtdparts: Pointer to a string describing the partitions with "mtdparts"
- * command syntax.
- * @_parts: Allocated array containing the partitions, must be freed by the
- * caller.
- * @_nparts: Size of @_parts array.
- *
- * @return 0 on success, an error otherwise.
- */
- int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
- struct mtd_partition **_parts, int *_nparts)
- {
- struct mtd_partition partition = {}, *parts;
- const char *mtdparts = *_mtdparts;
- int cur_off = 0, cur_sz = 0;
- int nparts = 0;
- int ret, idx;
- u64 sz;
- /* First, iterate over the partitions until we know their number */
- while (mtdparts[0] != '\0' && mtdparts[0] != ';') {
- ret = mtd_parse_partition(&mtdparts, &partition);
- if (ret)
- return ret;
- free((char *)partition.name);
- nparts++;
- }
- /* Allocate an array of partitions to give back to the caller */
- parts = malloc(sizeof(*parts) * nparts);
- if (!parts) {
- printf("Not enough space to save partitions meta-data\n");
- return -ENOMEM;
- }
- /* Iterate again over each partition to save the data in our array */
- for (idx = 0; idx < nparts; idx++) {
- ret = mtd_parse_partition(_mtdparts, &parts[idx]);
- if (ret)
- return ret;
- if (parts[idx].size == MTD_SIZE_REMAINING)
- parts[idx].size = parent->size - cur_sz;
- cur_sz += parts[idx].size;
- sz = parts[idx].size;
- if (sz < parent->writesize || do_div(sz, parent->writesize)) {
- printf("Partition size must be a multiple of %d\n",
- parent->writesize);
- return -EINVAL;
- }
- if (parts[idx].offset == MTD_OFFSET_NOT_SPECIFIED)
- parts[idx].offset = cur_off;
- cur_off += parts[idx].size;
- parts[idx].ecclayout = parent->ecclayout;
- }
- /* Offset by one mtdparts to point to the next device if any */
- if (*_mtdparts[0] == ';')
- (*_mtdparts)++;
- *_parts = parts;
- *_nparts = nparts;
- return 0;
- }
- /**
- * mtd_free_parsed_partitions - Free dynamically allocated partitions
- *
- * Each successful call to @mtd_parse_partitions must be followed by a call to
- * @mtd_free_parsed_partitions to free any allocated array during the parsing
- * process.
- *
- * @parts: Array containing the partitions that will be freed.
- * @nparts: Size of @parts array.
- */
- void mtd_free_parsed_partitions(struct mtd_partition *parts,
- unsigned int nparts)
- {
- int i;
- for (i = 0; i < nparts; i++)
- free((char *)parts[i].name);
- free(parts);
- }
- /*
- * MTD methods which simply translate the effective address and pass through
- * to the _real_ device.
- */
- static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
- {
- struct mtd_ecc_stats stats;
- int res;
- stats = mtd->parent->ecc_stats;
- res = mtd->parent->_read(mtd->parent, from + mtd->offset, len,
- retlen, buf);
- if (unlikely(mtd_is_eccerr(res)))
- mtd->ecc_stats.failed +=
- mtd->parent->ecc_stats.failed - stats.failed;
- else
- mtd->ecc_stats.corrected +=
- mtd->parent->ecc_stats.corrected - stats.corrected;
- return res;
- }
- #ifndef __UBOOT__
- static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
- size_t *retlen, void **virt, resource_size_t *phys)
- {
- return mtd->parent->_point(mtd->parent, from + mtd->offset, len,
- retlen, virt, phys);
- }
- static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
- {
- return mtd->parent->_unpoint(mtd->parent, from + mtd->offset, len);
- }
- #endif
- static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
- unsigned long len,
- unsigned long offset,
- unsigned long flags)
- {
- offset += mtd->offset;
- return mtd->parent->_get_unmapped_area(mtd->parent, len, offset, flags);
- }
- static int part_read_oob(struct mtd_info *mtd, loff_t from,
- struct mtd_oob_ops *ops)
- {
- int res;
- if (from >= mtd->size)
- return -EINVAL;
- if (ops->datbuf && from + ops->len > mtd->size)
- return -EINVAL;
- /*
- * If OOB is also requested, make sure that we do not read past the end
- * of this partition.
- */
- if (ops->oobbuf) {
- size_t len, pages;
- if (ops->mode == MTD_OPS_AUTO_OOB)
- len = mtd->oobavail;
- else
- len = mtd->oobsize;
- pages = mtd_div_by_ws(mtd->size, mtd);
- pages -= mtd_div_by_ws(from, mtd);
- if (ops->ooboffs + ops->ooblen > pages * len)
- return -EINVAL;
- }
- res = mtd->parent->_read_oob(mtd->parent, from + mtd->offset, ops);
- if (unlikely(res)) {
- if (mtd_is_bitflip(res))
- mtd->ecc_stats.corrected++;
- if (mtd_is_eccerr(res))
- mtd->ecc_stats.failed++;
- }
- return res;
- }
- static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
- size_t len, size_t *retlen, u_char *buf)
- {
- return mtd->parent->_read_user_prot_reg(mtd->parent, from, len,
- retlen, buf);
- }
- static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
- size_t *retlen, struct otp_info *buf)
- {
- return mtd->parent->_get_user_prot_info(mtd->parent, len, retlen,
- buf);
- }
- static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
- size_t len, size_t *retlen, u_char *buf)
- {
- return mtd->parent->_read_fact_prot_reg(mtd->parent, from, len,
- retlen, buf);
- }
- static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
- size_t *retlen, struct otp_info *buf)
- {
- return mtd->parent->_get_fact_prot_info(mtd->parent, len, retlen,
- buf);
- }
- static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
- {
- return mtd->parent->_write(mtd->parent, to + mtd->offset, len,
- retlen, buf);
- }
- static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
- {
- return mtd->parent->_panic_write(mtd->parent, to + mtd->offset, len,
- retlen, buf);
- }
- static int part_write_oob(struct mtd_info *mtd, loff_t to,
- struct mtd_oob_ops *ops)
- {
- if (to >= mtd->size)
- return -EINVAL;
- if (ops->datbuf && to + ops->len > mtd->size)
- return -EINVAL;
- return mtd->parent->_write_oob(mtd->parent, to + mtd->offset, ops);
- }
- static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
- size_t len, size_t *retlen, u_char *buf)
- {
- return mtd->parent->_write_user_prot_reg(mtd->parent, from, len,
- retlen, buf);
- }
- static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
- size_t len)
- {
- return mtd->parent->_lock_user_prot_reg(mtd->parent, from, len);
- }
- #ifndef __UBOOT__
- static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
- unsigned long count, loff_t to, size_t *retlen)
- {
- return mtd->parent->_writev(mtd->parent, vecs, count,
- to + mtd->offset, retlen);
- }
- #endif
- static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
- {
- int ret;
- instr->addr += mtd->offset;
- ret = mtd->parent->_erase(mtd->parent, instr);
- if (ret) {
- if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
- instr->fail_addr -= mtd->offset;
- instr->addr -= mtd->offset;
- }
- return ret;
- }
- void mtd_erase_callback(struct erase_info *instr)
- {
- if (instr->mtd->_erase == part_erase) {
- if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
- instr->fail_addr -= instr->mtd->offset;
- instr->addr -= instr->mtd->offset;
- }
- if (instr->callback)
- instr->callback(instr);
- }
- EXPORT_SYMBOL_GPL(mtd_erase_callback);
- static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
- {
- return mtd->parent->_lock(mtd->parent, ofs + mtd->offset, len);
- }
- static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
- {
- return mtd->parent->_unlock(mtd->parent, ofs + mtd->offset, len);
- }
- static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
- {
- return mtd->parent->_is_locked(mtd->parent, ofs + mtd->offset, len);
- }
- static void part_sync(struct mtd_info *mtd)
- {
- mtd->parent->_sync(mtd->parent);
- }
- #ifndef __UBOOT__
- static int part_suspend(struct mtd_info *mtd)
- {
- return mtd->parent->_suspend(mtd->parent);
- }
- static void part_resume(struct mtd_info *mtd)
- {
- mtd->parent->_resume(mtd->parent);
- }
- #endif
- static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
- {
- 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);
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