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From: Felix Fietkau <nbd@nbd.name>
Subject: make rootfs split/detection more generic - patch can be moved to generic-2.6 after testing on other platforms
lede-commit: 328e660b31f0937d52c5ae3d6e7029409918a9df
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
drivers/mtd/Kconfig | 17 +++++++++++++++++
drivers/mtd/mtdpart.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/mtd/partitions.h | 2 ++
3 files changed, 54 insertions(+)
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 5a2d71729b9a..f5ac04e288eb 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -12,6 +12,23 @@ menuconfig MTD
if MTD
+menu "OpenWrt specific MTD options"
+
+config MTD_ROOTFS_ROOT_DEV
+ bool "Automatically set 'rootfs' partition to be root filesystem"
+ default y
+
+config MTD_SPLIT_FIRMWARE
+ bool "Automatically split firmware partition for kernel+rootfs"
+ default y
+
+config MTD_SPLIT_FIRMWARE_NAME
+ string "Firmware partition name"
+ depends on MTD_SPLIT_FIRMWARE
+ default "firmware"
+
+endmenu
+
config MTD_TESTS
tristate "MTD tests support (DANGEROUS)"
depends on m
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index dd86b430e46e..33d152d1876a 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -29,10 +29,12 @@
#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
+#include <linux/magic.h>
#include <linux/of.h>
#include <linux/err.h>
#include "mtdcore.h"
+#include "mtdsplit/mtdsplit.h"
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
@@ -52,6 +54,8 @@ struct mtd_part {
struct list_head list;
};
+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
+
/*
* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
* the pointer to that structure.
@@ -678,6 +682,7 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
+ mtd_partition_split(parent, new);
mtd_add_partition_attrs(new);
@@ -756,6 +761,35 @@ int mtd_del_partition(struct mtd_info *mtd, int partno)
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
+#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
+#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
+#else
+#define SPLIT_FIRMWARE_NAME "unused"
+#endif
+
+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,
+ int offset, int size)
+{
+}
+
+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
+{
+ static int rootfs_found = 0;
+
+ if (rootfs_found)
+ return;
+
+ if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
+ IS_ENABLED(CONFIG_MTD_SPLIT_FIRMWARE))
+ split_firmware(master, part);
+
+ arch_split_mtd_part(master, part->mtd.name, part->offset,
+ part->mtd.size);
+}
/*
* 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
@@ -787,6 +821,7 @@ int add_mtd_partitions(struct mtd_info *master,
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
+ mtd_partition_split(master, slave);
mtd_add_partition_attrs(slave);
if (parts[i].types)
mtd_parse_part(slave, parts[i].types);
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index c4beb70dacbd..320a791290c5 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -109,5 +109,7 @@ 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);
uint64_t mtd_get_device_size(const struct mtd_info *mtd);
+extern void __weak arch_split_mtd_part(struct mtd_info *master,
+ const char *name, int offset, int size);
#endif
--
2.11.0
|
