diff options
author | Heiko Schocher <hs@denx.de> | 2014-06-24 12:10:04 +0400 |
---|---|---|
committer | Tom Rini <trini@ti.com> | 2014-08-26 03:25:55 +0400 |
commit | ff94bc40af3481d47546595ba73c136de6af6929 (patch) | |
tree | 858119077e2ca8a992589185c36bd431e4a8c80e /drivers/mtd/mtdpart.c | |
parent | 0c06db59836746c5caf397e642cd0f2bf1cc20a6 (diff) | |
download | u-boot-ff94bc40af3481d47546595ba73c136de6af6929.tar.xz |
mtd, ubi, ubifs: resync with Linux-3.14
resync ubi subsystem with linux:
commit 455c6fdbd219161bd09b1165f11699d6d73de11c
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Mar 30 20:40:15 2014 -0700
Linux 3.14
A nice side effect of this, is we introduce UBI Fastmap support
to U-Boot.
Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Sergey Lapin <slapin@ossfans.org>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Joerg Krause <jkrause@posteo.de>
Diffstat (limited to 'drivers/mtd/mtdpart.c')
-rw-r--r-- | drivers/mtd/mtdpart.c | 515 |
1 files changed, 455 insertions, 60 deletions
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index 146ce11eb1..d20b8578e7 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -1,35 +1,50 @@ /* * Simple MTD partitioning layer * - * (C) 2000 Nicolas Pitre <nico@cam.org> + * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net> + * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de> + * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> * - * This code is GPL + * SPDX-License-Identifier: GPL-2.0+ * - * 02-21-2002 Thomas Gleixner <gleixner@autronix.de> - * added support for read_oob, write_oob */ +#define __UBOOT__ +#ifndef __UBOOT__ +#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 <asm/errno.h> +#include <linux/compat.h> +#include <ubi_uboot.h> -#include <linux/types.h> -#include <linux/list.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> -#include <linux/compat.h> +#include <linux/err.h> + +#include "mtdcore.h" /* Our partition linked list */ -struct list_head mtd_partitions; +static LIST_HEAD(mtd_partitions); +#ifndef __UBOOT__ +static DEFINE_MUTEX(mtd_partitions_mutex); +#else +DEFINE_MUTEX(mtd_partitions_mutex); +#endif /* Our partition node structure */ struct mtd_part { struct mtd_info mtd; struct mtd_info *master; uint64_t offset; - int index; struct list_head list; - int registered; }; /* @@ -39,6 +54,30 @@ struct mtd_part { #define PART(x) ((struct mtd_part *)(x)) +#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 + /* * MTD methods which simply translate the effective address and pass through * to the _real_ device. @@ -52,7 +91,8 @@ static int part_read(struct mtd_info *mtd, loff_t from, size_t len, int res; stats = part->master->ecc_stats; - res = mtd_read(part->master, from + part->offset, len, retlen, buf); + res = part->master->_read(part->master, from + part->offset, len, + retlen, buf); if (unlikely(mtd_is_eccerr(res))) mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed; @@ -62,6 +102,36 @@ static int part_read(struct mtd_info *mtd, loff_t from, size_t len, 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) +{ + struct mtd_part *part = PART(mtd); + + return part->master->_point(part->master, from + part->offset, len, + retlen, virt, phys); +} + +static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) +{ + struct mtd_part *part = PART(mtd); + + return part->master->_unpoint(part->master, from + part->offset, len); +} +#endif + +static unsigned long part_get_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + struct mtd_part *part = PART(mtd); + + offset += part->offset; + return part->master->_get_unmapped_area(part->master, len, offset, + flags); +} + static int part_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { @@ -72,8 +142,25 @@ static int part_read_oob(struct mtd_info *mtd, loff_t from, return -EINVAL; if (ops->datbuf && from + ops->len > mtd->size) return -EINVAL; - res = mtd_read_oob(part->master, from + part->offset, ops); + /* + * 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 = part->master->_read_oob(part->master, from + part->offset, ops); if (unlikely(res)) { if (mtd_is_bitflip(res)) mtd->ecc_stats.corrected++; @@ -87,35 +174,46 @@ static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = PART(mtd); - return mtd_read_user_prot_reg(part->master, from, len, retlen, buf); + return part->master->_read_user_prot_reg(part->master, from, len, + retlen, buf); } static int part_get_user_prot_info(struct mtd_info *mtd, struct otp_info *buf, size_t len) { struct mtd_part *part = PART(mtd); - return mtd_get_user_prot_info(part->master, buf, len); + return part->master->_get_user_prot_info(part->master, buf, len); } static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = PART(mtd); - return mtd_read_fact_prot_reg(part->master, from, len, retlen, buf); + return part->master->_read_fact_prot_reg(part->master, from, len, + retlen, buf); } static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, size_t len) { struct mtd_part *part = PART(mtd); - return mtd_get_fact_prot_info(part->master, buf, len); + return part->master->_get_fact_prot_info(part->master, buf, len); } static int part_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct mtd_part *part = PART(mtd); - return mtd_write(part->master, to + part->offset, len, retlen, buf); + return part->master->_write(part->master, to + part->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) +{ + struct mtd_part *part = PART(mtd); + return part->master->_panic_write(part->master, to + part->offset, len, + retlen, buf); } static int part_write_oob(struct mtd_info *mtd, loff_t to, @@ -127,30 +225,41 @@ static int part_write_oob(struct mtd_info *mtd, loff_t to, return -EINVAL; if (ops->datbuf && to + ops->len > mtd->size) return -EINVAL; - return mtd_write_oob(part->master, to + part->offset, ops); + return part->master->_write_oob(part->master, to + part->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) { struct mtd_part *part = PART(mtd); - return mtd_write_user_prot_reg(part->master, from, len, retlen, buf); + return part->master->_write_user_prot_reg(part->master, from, len, + retlen, buf); } static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) { struct mtd_part *part = PART(mtd); - return mtd_lock_user_prot_reg(part->master, from, len); + return part->master->_lock_user_prot_reg(part->master, 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) +{ + struct mtd_part *part = PART(mtd); + return part->master->_writev(part->master, vecs, count, + to + part->offset, retlen); +} +#endif + static int part_erase(struct mtd_info *mtd, struct erase_info *instr) { struct mtd_part *part = PART(mtd); int ret; instr->addr += part->offset; - ret = mtd_erase(part->master, instr); + ret = part->master->_erase(part->master, instr); if (ret) { if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) instr->fail_addr -= part->offset; @@ -171,30 +280,51 @@ void mtd_erase_callback(struct erase_info *instr) 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) { struct mtd_part *part = PART(mtd); - return mtd_lock(part->master, ofs + part->offset, len); + return part->master->_lock(part->master, ofs + part->offset, len); } static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { struct mtd_part *part = PART(mtd); - return mtd_unlock(part->master, ofs + part->offset, len); + return part->master->_unlock(part->master, ofs + part->offset, len); +} + +static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) +{ + struct mtd_part *part = PART(mtd); + return part->master->_is_locked(part->master, ofs + part->offset, len); } static void part_sync(struct mtd_info *mtd) { struct mtd_part *part = PART(mtd); - mtd_sync(part->master); + part->master->_sync(part->master); } +#ifndef __UBOOT__ +static int part_suspend(struct mtd_info *mtd) +{ + struct mtd_part *part = PART(mtd); + return part->master->_suspend(part->master); +} + +static void part_resume(struct mtd_info *mtd) +{ + struct mtd_part *part = PART(mtd); + part->master->_resume(part->master); +} +#endif + static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) { struct mtd_part *part = PART(mtd); ofs += part->offset; - return mtd_block_isbad(part->master, ofs); + return part->master->_block_isbad(part->master, ofs); } static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) @@ -203,12 +333,18 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) int res; ofs += part->offset; - res = mtd_block_markbad(part->master, ofs); + res = part->master->_block_markbad(part->master, ofs); if (!res) mtd->ecc_stats.badblocks++; return res; } +static inline void free_partition(struct mtd_part *p) +{ + kfree(p->mtd.name); + kfree(p); +} + /* * This function unregisters and destroy all slave MTD objects which are * attached to the given master MTD object. @@ -217,49 +353,78 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) int del_mtd_partitions(struct mtd_info *master) { struct mtd_part *slave, *next; + int ret, err = 0; + mutex_lock(&mtd_partitions_mutex); list_for_each_entry_safe(slave, next, &mtd_partitions, list) if (slave->master == master) { + ret = del_mtd_device(&slave->mtd); + if (ret < 0) { + err = ret; + continue; + } list_del(&slave->list); - if (slave->registered) - del_mtd_device(&slave->mtd); - kfree(slave); + free_partition(slave); } + mutex_unlock(&mtd_partitions_mutex); - return 0; + return err; } -static struct mtd_part *add_one_partition(struct mtd_info *master, - const struct mtd_partition *part, int partno, - uint64_t cur_offset) +static struct mtd_part *allocate_partition(struct mtd_info *master, + const struct mtd_partition *part, int partno, + uint64_t cur_offset) { struct mtd_part *slave; + char *name; /* allocate the partition structure */ slave = kzalloc(sizeof(*slave), GFP_KERNEL); - if (!slave) { + name = kstrdup(part->name, GFP_KERNEL); + if (!name || !slave) { printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", - master->name); - del_mtd_partitions(master); - return NULL; + master->name); + kfree(name); + kfree(slave); + return ERR_PTR(-ENOMEM); } - list_add(&slave->list, &mtd_partitions); /* set up the MTD object for this partition */ slave->mtd.type = master->type; slave->mtd.flags = master->flags & ~part->mask_flags; slave->mtd.size = part->size; slave->mtd.writesize = master->writesize; + slave->mtd.writebufsize = master->writebufsize; slave->mtd.oobsize = master->oobsize; slave->mtd.oobavail = master->oobavail; slave->mtd.subpage_sft = master->subpage_sft; - slave->mtd.name = part->name; + slave->mtd.name = name; slave->mtd.owner = master->owner; +#ifndef __UBOOT__ + slave->mtd.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->mtd.dev.parent = master->dev.parent; +#endif slave->mtd._read = part_read; slave->mtd._write = part_write; + if (master->_panic_write) + slave->mtd._panic_write = part_panic_write; + +#ifndef __UBOOT__ + if (master->_point && master->_unpoint) { + slave->mtd._point = part_point; + slave->mtd._unpoint = part_unpoint; + } +#endif + + if (master->_get_unmapped_area) + slave->mtd._get_unmapped_area = part_get_unmapped_area; if (master->_read_oob) slave->mtd._read_oob = part_read_oob; if (master->_write_oob) @@ -278,10 +443,21 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, slave->mtd._get_fact_prot_info = part_get_fact_prot_info; if (master->_sync) slave->mtd._sync = part_sync; +#ifndef __UBOOT__ + if (!partno && !master->dev.class && master->_suspend && + master->_resume) { + slave->mtd._suspend = part_suspend; + slave->mtd._resume = part_resume; + } + if (master->_writev) + slave->mtd._writev = part_writev; +#endif if (master->_lock) slave->mtd._lock = part_lock; if (master->_unlock) slave->mtd._unlock = part_unlock; + if (master->_is_locked) + slave->mtd._is_locked = part_is_locked; if (master->_block_isbad) slave->mtd._block_isbad = part_block_isbad; if (master->_block_markbad) @@ -289,7 +465,6 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, slave->mtd._erase = part_erase; slave->master = master; slave->offset = part->offset; - slave->index = partno; if (slave->offset == MTDPART_OFS_APPEND) slave->offset = cur_offset; @@ -298,18 +473,29 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, 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); + 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->mtd.size) { + slave->mtd.size = master->size - slave->offset + - slave->mtd.size; + } else { + debug("mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", + part->name, master->size - slave->offset, + slave->mtd.size); + /* register to preserve ordering */ + goto out_register; } } if (slave->mtd.size == MTDPART_SIZ_FULL) slave->mtd.size = master->size - slave->offset; - debug("0x%012llx-0x%012llx : \"%s\"\n", - (unsigned long long)slave->offset, - (unsigned long long)(slave->offset + slave->mtd.size), - slave->mtd.name); + debug("0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, + (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); /* let's do some sanity checks */ if (slave->offset >= master->size) { @@ -336,7 +522,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, for (i = 0; i < max && regions[i].offset <= slave->offset; i++) ; /* The loop searched for the region _behind_ the first one */ - i--; + if (i > 0) + i--; /* Pick biggest erasesize */ for (; i < max && regions[i].offset < end; i++) { @@ -367,6 +554,10 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, } slave->mtd.ecclayout = master->ecclayout; + slave->mtd.ecc_step_size = master->ecc_step_size; + slave->mtd.ecc_strength = master->ecc_strength; + slave->mtd.bitflip_threshold = master->bitflip_threshold; + if (master->_block_isbad) { uint64_t offs = 0; @@ -378,18 +569,89 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, } out_register: - if (part->mtdp) { - /* store the object pointer (caller may or may not register it*/ - *part->mtdp = &slave->mtd; - slave->registered = 0; - } else { - /* register our partition */ - add_mtd_device(&slave->mtd); - slave->registered = 1; - } return slave; } +int mtd_add_partition(struct mtd_info *master, const char *name, + long long offset, long long length) +{ + struct mtd_partition part; + struct mtd_part *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, &mtd_partitions, list) + if (p->master == master) { + if ((start >= p->offset) && + (start < (p->offset + p->mtd.size))) + goto err_inv; + + if ((end >= p->offset) && + (end < (p->offset + p->mtd.size))) + goto err_inv; + } + + list_add(&new->list, &mtd_partitions); + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&new->mtd); + + 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_part *slave, *next; + int ret = -EINVAL; + + mutex_lock(&mtd_partitions_mutex); + list_for_each_entry_safe(slave, next, &mtd_partitions, list) + if ((slave->master == master) && + (slave->mtd.index == partno)) { + ret = del_mtd_device(&slave->mtd); + if (ret < 0) + break; + + list_del(&slave->list); + free_partition(slave); + break; + } + mutex_unlock(&mtd_partitions_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(mtd_del_partition); + /* * 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 @@ -407,6 +669,7 @@ int add_mtd_partitions(struct mtd_info *master, uint64_t cur_offset = 0; int i; +#ifdef __UBOOT__ /* * Need to init the list here, since LIST_INIT() does not * work on platforms where relocation has problems (like MIPS @@ -414,15 +677,147 @@ int add_mtd_partitions(struct mtd_info *master, */ if (mtd_partitions.next == NULL) INIT_LIST_HEAD(&mtd_partitions); +#endif debug("Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); for (i = 0; i < nbparts; i++) { - slave = add_one_partition(master, parts + i, i, cur_offset); - if (!slave) - return -ENOMEM; + slave = allocate_partition(master, parts + i, i, cur_offset); + if (IS_ERR(slave)) + return PTR_ERR(slave); + + mutex_lock(&mtd_partitions_mutex); + list_add(&slave->list, &mtd_partitions); + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&slave->mtd); + cur_offset = slave->offset + slave->mtd.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 + +int mtd_is_partition(const struct mtd_info *mtd) +{ + struct mtd_part *part; + int ispart = 0; + + mutex_lock(&mtd_partitions_mutex); + list_for_each_entry(part, &mtd_partitions, list) + if (&part->mtd == mtd) { + ispart = 1; + break; + } + mutex_unlock(&mtd_partitions_mutex); + + return ispart; +} +EXPORT_SYMBOL_GPL(mtd_is_partition); + +/* 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->size; + + return PART(mtd)->master->size; +} +EXPORT_SYMBOL_GPL(mtd_get_device_size); |