diff options
Diffstat (limited to 'target/linux/generic/patches-4.0/400-mtd-add-rootfs-split-support.patch')
| -rw-r--r-- | target/linux/generic/patches-4.0/400-mtd-add-rootfs-split-support.patch | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.0/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-4.0/400-mtd-add-rootfs-split-support.patch new file mode 100644 index 0000000..6cb31dc --- /dev/null +++ b/target/linux/generic/patches-4.0/400-mtd-add-rootfs-split-support.patch @@ -0,0 +1,171 @@ +--- 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 +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -29,9 +29,11 @@ + #include <linux/kmod.h> + #include <linux/mtd/mtd.h> + #include <linux/mtd/partitions.h> ++#include <linux/magic.h> + #include <linux/err.h> + + #include "mtdcore.h" ++#include "mtdsplit/mtdsplit.h" + + /* Our partition linked list */ + static LIST_HEAD(mtd_partitions); +@@ -45,13 +47,14 @@ 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 with this macro. + */ + #define PART(x) ((struct mtd_part *)(x)) + +- + /* + * MTD methods which simply translate the effective address and pass through + * to the _real_ device. +@@ -546,8 +549,10 @@ out_register: + return slave; + } + +-int mtd_add_partition(struct mtd_info *master, const char *name, +- long long offset, long long length) ++ ++static int ++__mtd_add_partition(struct mtd_info *master, const char *name, ++ long long offset, long long length, bool dup_check) + { + struct mtd_partition part; + struct mtd_part *p, *new; +@@ -579,21 +584,24 @@ int mtd_add_partition(struct mtd_info *m + 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; +- } ++ if (dup_check) { ++ 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); ++ mtd_partition_split(master, new); + + return ret; + err_inv: +@@ -603,6 +611,12 @@ err_inv: + } + EXPORT_SYMBOL_GPL(mtd_add_partition); + ++int mtd_add_partition(struct mtd_info *master, const char *name, ++ long long offset, long long length) ++{ ++ return __mtd_add_partition(master, name, offset, length, true); ++} ++ + int mtd_del_partition(struct mtd_info *master, int partno) + { + struct mtd_part *slave, *next; +@@ -626,6 +640,35 @@ 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 ++#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) && ++ config_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 +@@ -655,6 +698,7 @@ int add_mtd_partitions(struct mtd_info * + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&slave->mtd); ++ mtd_partition_split(master, slave); + + cur_offset = slave->offset + slave->mtd.size; + } +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -84,5 +84,7 @@ 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); ++extern void __weak arch_split_mtd_part(struct mtd_info *master, ++ const char *name, int offset, int size); + + #endif |