--- /dev/null
+From 97519dc52b44af054d7654776e78eaa211cf1842 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 21 Jun 2017 08:26:45 +0200
+Subject: [PATCH] mtd: partitions: add support for subpartitions
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some flash device partitions can be containers with extra subpartitions
+(volumes). All callbacks are already capable of this additional level of
+indirection.
+
+This patch makes sure we always display subpartitions using a tree
+structure and takes care of deleting subpartitions when parent gets
+removed.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 23 ++++++++++++++++-------
+ 1 file changed, 16 insertions(+), 7 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -413,7 +413,7 @@ static struct mtd_part *allocate_partiti
+ * parent conditional on that option. Note, this is a way to
+ * distinguish between the master and the partition in sysfs.
+ */
+- slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) ?
++ slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
+ &parent->dev :
+ parent->dev.parent;
+ slave->mtd.dev.of_node = part->of_node;
+@@ -664,8 +664,17 @@ EXPORT_SYMBOL_GPL(mtd_add_partition);
+ */
+ static int __mtd_del_partition(struct mtd_part *priv)
+ {
++ struct mtd_part *child, *next;
+ int err;
+
++ list_for_each_entry_safe(child, next, &mtd_partitions, list) {
++ if (child->parent == &priv->mtd) {
++ err = __mtd_del_partition(child);
++ if (err)
++ return err;
++ }
++ }
++
+ sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
+
+ err = del_mtd_device(&priv->mtd);
+@@ -680,16 +689,16 @@ static int __mtd_del_partition(struct mt
+
+ /*
+ * This function unregisters and destroy all slave MTD objects which are
+- * attached to the given master MTD object.
++ * attached to the given MTD object.
+ */
+-int del_mtd_partitions(struct mtd_info *master)
++int del_mtd_partitions(struct mtd_info *mtd)
+ {
+ 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->parent == master) {
++ if (slave->parent == mtd) {
+ ret = __mtd_del_partition(slave);
+ if (ret < 0)
+ err = ret;
+@@ -699,14 +708,14 @@ int del_mtd_partitions(struct mtd_info *
+ return err;
+ }
+
+-int mtd_del_partition(struct mtd_info *master, int partno)
++int mtd_del_partition(struct mtd_info *mtd, 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->parent == master) &&
++ if ((slave->parent == mtd) &&
+ (slave->mtd.index == partno)) {
+ ret = __mtd_del_partition(slave);
+ break;
+@@ -939,6 +948,6 @@ uint64_t mtd_get_device_size(const struc
+ if (!mtd_is_partition(mtd))
+ return mtd->size;
+
+- return mtd_to_part(mtd)->parent->size;
++ return mtd_get_device_size(mtd_to_part(mtd)->parent);
+ }
+ EXPORT_SYMBOL_GPL(mtd_get_device_size);
--- /dev/null
+From 1a0915be192606fee64830b9c5d70b7ed59426b6 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 21 Jun 2017 08:26:46 +0200
+Subject: [PATCH] mtd: partitions: add support for partition parsers
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some devices have partitions that are kind of containers with extra
+subpartitions / volumes instead of e.g. a simple filesystem data. To
+support such cases we need to first create normal flash device
+partitions and then take care of these special ones.
+
+It's very common case for home routers. Depending on the vendor there
+are formats like TRX, Seama, TP-Link, WRGG & more. All of them are used
+to embed few partitions into a single one / single firmware file.
+
+Ideally all vendors would use some well documented / standardized format
+like UBI (and some probably start doing so), but there are still
+countless devices on the market using these poor vendor specific
+formats.
+
+This patch extends MTD subsystem by allowing to specify list of parsers
+that should be tried for a given partition. Supporting such poor formats
+is highly unlikely to be the top priority so these changes try to
+minimize maintenance cost to the minimum. It reuses existing code for
+these new parsers and just adds a one property and one new function.
+
+This implementation requires setting partition parsers in a flash
+parser. A proper change of bcm47xxpart will follow and in the future we
+will hopefully also find a solution for doing it with ofpart
+("fixed-partitions").
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/mtdpart.c | 31 +++++++++++++++++++++++++++++++
+ include/linux/mtd/partitions.h | 7 +++++++
+ 2 files changed, 38 insertions(+)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -369,6 +369,35 @@ static inline void free_partition(struct
+ kfree(p);
+ }
+
++/**
++ * mtd_parse_part - parse MTD partition looking for subpartitions
++ *
++ * @slave: part that is supposed to be a container and should be parsed
++ * @types: NULL-terminated array with names of partition parsers to try
++ *
++ * Some partitions are kind of containers with extra subpartitions (volumes).
++ * There can be various formats of such containers. This function tries to use
++ * specified parsers to analyze given partition and registers found
++ * subpartitions on success.
++ */
++static int mtd_parse_part(struct mtd_part *slave, const char *const *types)
++{
++ struct mtd_partitions parsed;
++ int err;
++
++ err = parse_mtd_partitions(&slave->mtd, types, &parsed, NULL);
++ if (err)
++ return err;
++ else if (!parsed.nr_parts)
++ return -ENOENT;
++
++ err = add_mtd_partitions(&slave->mtd, parsed.parts, parsed.nr_parts);
++
++ mtd_part_parser_cleanup(&parsed);
++
++ return err;
++}
++
+ static struct mtd_part *allocate_partition(struct mtd_info *parent,
+ const struct mtd_partition *part, int partno,
+ uint64_t cur_offset)
+@@ -758,6 +787,8 @@ int add_mtd_partitions(struct mtd_info *
+
+ add_mtd_device(&slave->mtd);
+ mtd_add_partition_attrs(slave);
++ if (parts[i].types)
++ mtd_parse_part(slave, parts[i].types);
+
+ cur_offset = slave->offset + slave->mtd.size;
+ }
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -20,6 +20,12 @@
+ *
+ * For each partition, these fields are available:
+ * name: string that will be used to label the partition's MTD device.
++ * types: some partitions can be containers using specific format to describe
++ * embedded subpartitions / volumes. E.g. many home routers use "firmware"
++ * partition that contains at least kernel and rootfs. In such case an
++ * extra parser is needed that will detect these dynamic partitions and
++ * report them to the MTD subsystem. If set this property stores an array
++ * of parser names to use when looking for subpartitions.
+ * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
+ * will extend to the end of the master MTD device.
+ * offset: absolute starting position within the master MTD device; if
+@@ -38,6 +44,7 @@
+
+ struct mtd_partition {
+ const char *name; /* identifier string */
++ const char *const *types; /* names of parsers to use if any */
+ uint64_t size; /* partition size */
+ uint64_t offset; /* offset within the master MTD space */
+ uint32_t mask_flags; /* master MTD flags to mask out for this partition */
#include <linux/err.h>
#include "mtdcore.h"
-@@ -815,6 +816,42 @@ void deregister_mtd_parser(struct mtd_pa
+@@ -855,6 +856,42 @@ void deregister_mtd_parser(struct mtd_pa
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
/*
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
* are changing this array!
*/
-@@ -872,6 +909,13 @@ int parse_mtd_partitions(struct mtd_info
+@@ -912,6 +949,13 @@ int parse_mtd_partitions(struct mtd_info
{
struct mtd_part_parser *parser;
int ret, err = 0;
if (!types)
types = default_mtd_part_types;
-@@ -897,6 +941,7 @@ int parse_mtd_partitions(struct mtd_info
+@@ -937,6 +981,7 @@ int parse_mtd_partitions(struct mtd_info
if (ret < 0 && !err)
err = ret;
}
/*
* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
* the pointer to that structure.
-@@ -649,6 +653,7 @@ int mtd_add_partition(struct mtd_info *p
+@@ -678,6 +682,7 @@ int mtd_add_partition(struct mtd_info *p
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
mtd_add_partition_attrs(new);
-@@ -718,6 +723,35 @@ int mtd_del_partition(struct mtd_info *m
+@@ -756,6 +761,35 @@ int mtd_del_partition(struct mtd_info *m
}
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
-@@ -749,6 +783,7 @@ int add_mtd_partitions(struct mtd_info *
+@@ -787,6 +821,7 @@ int add_mtd_partitions(struct mtd_info *
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
+ mtd_partition_split(master, slave);
mtd_add_partition_attrs(slave);
-
- cur_offset = slave->offset + slave->mtd.size;
+ if (parts[i].types)
+ mtd_parse_part(slave, parts[i].types);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
-@@ -102,5 +102,7 @@ int mtd_add_partition(struct mtd_info *m
+@@ -109,5 +109,7 @@ int mtd_add_partition(struct mtd_info *m
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);
uint64_t mtd_get_device_size(const struct mtd_info *mtd);
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
-@@ -996,6 +996,62 @@ void mtd_part_parser_cleanup(struct mtd_
+@@ -1036,6 +1036,62 @@ void mtd_part_parser_cleanup(struct mtd_
}
}
struct mtd_part *part;
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
-@@ -61,11 +61,14 @@ struct mtd_part_parser_data {
+@@ -68,11 +68,14 @@ struct mtd_part_parser_data {
unsigned long origin;
};
struct mtd_part_parser {
struct list_head list;
struct module *owner;
-@@ -73,6 +76,7 @@ struct mtd_part_parser {
+@@ -80,6 +83,7 @@ struct mtd_part_parser {
int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
struct mtd_part_parser_data *);
void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
};
/* Container for passing around a set of parsed partitions */
-@@ -105,4 +109,9 @@ uint64_t mtd_get_device_size(const struc
+@@ -112,4 +116,9 @@ uint64_t mtd_get_device_size(const struc
extern void __weak arch_split_mtd_part(struct mtd_info *master,
const char *name, int offset, int size);
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
-@@ -723,6 +723,36 @@ int mtd_del_partition(struct mtd_info *m
+@@ -761,6 +761,36 @@ int mtd_del_partition(struct mtd_info *m
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
#else
-@@ -731,6 +761,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
+@@ -769,6 +799,7 @@ EXPORT_SYMBOL_GPL(mtd_del_partition);
static void split_firmware(struct mtd_info *master, struct mtd_part *part)
{
}
void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
-@@ -745,6 +776,12 @@ static void mtd_partition_split(struct m
+@@ -783,6 +814,12 @@ static void mtd_partition_split(struct m
if (rootfs_found)
return;
split_firmware(master, part);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
-@@ -67,6 +67,8 @@ struct mtd_part_parser_data {
+@@ -74,6 +74,8 @@ struct mtd_part_parser_data {
enum mtd_parser_type {
MTD_PARSER_TYPE_DEVICE = 0,
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
-@@ -753,6 +753,17 @@ run_parsers_by_type(struct mtd_part *sla
+@@ -791,6 +791,17 @@ run_parsers_by_type(struct mtd_part *sla
return nr_parts;
}
#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
#else
-@@ -1106,6 +1117,24 @@ int mtd_is_partition(const struct mtd_in
+@@ -1146,6 +1157,24 @@ int mtd_is_partition(const struct mtd_in
}
EXPORT_SYMBOL_GPL(mtd_is_partition);
{
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
-@@ -107,6 +107,8 @@ int mtd_is_partition(const struct mtd_in
+@@ -114,6 +114,8 @@ int mtd_is_partition(const struct mtd_in
int mtd_add_partition(struct mtd_info *master, const char *name,
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
-@@ -35,6 +35,7 @@
+@@ -41,6 +41,7 @@
* Note: writeable partitions require their size and offset be
* erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
*/
struct mtd_partition {
const char *name; /* identifier string */
-@@ -50,7 +51,6 @@ struct mtd_partition {
+@@ -57,7 +58,6 @@ struct mtd_partition {
#define MTDPART_SIZ_FULL (0)
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
-@@ -561,19 +630,22 @@ static struct mtd_part *allocate_partiti
+@@ -590,19 +659,22 @@ static struct mtd_part *allocate_partiti
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
/* Doesn't start on a boundary of major erase size */
projects / openwrt / staging / mkresin.git / commitdiff