diff options
4 files changed, 185 insertions, 0 deletions
diff --git a/target/linux/generic/config-3.10 b/target/linux/generic/config-3.10 index 9e1b100..61c7cf7 100644 --- a/target/linux/generic/config-3.10 +++ b/target/linux/generic/config-3.10 @@ -1935,6 +1935,7 @@ CONFIG_MTD_ROOTFS_SPLIT=y CONFIG_MTD_SPLIT=y # CONFIG_MTD_SPLIT_FIRMWARE is not set CONFIG_MTD_SPLIT_FIRMWARE_NAME="firmware" +# CONFIG_MTD_SPLIT_SQUASHFS_ROOT is not set # CONFIG_MTD_SST25L is not set # CONFIG_MTD_SWAP is not set # CONFIG_MTD_TESTS is not set diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit_squashfs.c b/target/linux/generic/files/drivers/mtd/mtdsplit_squashfs.c new file mode 100644 index 0000000..7953e8c --- /dev/null +++ b/target/linux/generic/files/drivers/mtd/mtdsplit_squashfs.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> + * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/magic.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> +#include <linux/byteorder/generic.h> + +#include "mtdsplit.h" + +static int +mtdsplit_parse_squashfs(struct mtd_info *master, + struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + struct mtd_partition *part; + struct mtd_info *parent_mtd; + size_t part_offset; + size_t squashfs_len; + int err; + + err = mtd_get_squashfs_len(master, 0, &squashfs_len); + if (err) + return err; + + parent_mtd = mtdpart_get_master(master); + part_offset = mtdpart_get_offset(master); + + part = kzalloc(sizeof(*part), GFP_KERNEL); + if (!part) { + pr_alert("unable to allocate memory for \"%s\" partition\n", + ROOTFS_SPLIT_NAME); + return -ENOMEM; + } + + part->name = ROOTFS_SPLIT_NAME; + part->offset = mtd_roundup_to_eb(part_offset + squashfs_len, + parent_mtd) - part_offset; + part->size = master->size - part->offset; + + *pparts = part; + return 1; +} + +static struct mtd_part_parser mtdsplit_squashfs_parser = { + .owner = THIS_MODULE, + .name = "squashfs-split", + .parse_fn = mtdsplit_parse_squashfs, + .type = MTD_PARSER_TYPE_ROOTFS, +}; + +static int +mtdsplit_squashfs_init(void) +{ + return register_mtd_parser(&mtdsplit_squashfs_parser); +} + +subsys_initcall(mtdsplit_squashfs_init); diff --git a/target/linux/generic/patches-3.10/405-mtd-add-more-helper-functions.patch b/target/linux/generic/patches-3.10/405-mtd-add-more-helper-functions.patch new file mode 100644 index 0000000..4e54b1b --- /dev/null +++ b/target/linux/generic/patches-3.10/405-mtd-add-more-helper-functions.patch @@ -0,0 +1,83 @@ +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -435,14 +435,12 @@ static struct mtd_part *allocate_partiti + 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; ++ /* Round up to next erasesize */ ++ slave->offset = mtd_roundup_to_eb(cur_offset, master); ++ if (slave->offset != cur_offset) + printk(KERN_NOTICE "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; +@@ -996,6 +994,24 @@ int mtd_is_partition(const struct mtd_in + } + EXPORT_SYMBOL_GPL(mtd_is_partition); + ++struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd) ++{ ++ if (!mtd_is_partition(mtd)) ++ return (struct mtd_info *)mtd; ++ ++ return PART(mtd)->master; ++} ++EXPORT_SYMBOL_GPL(mtdpart_get_master); ++ ++uint64_t mtdpart_get_offset(const struct mtd_info *mtd) ++{ ++ if (!mtd_is_partition(mtd)) ++ return 0; ++ ++ return PART(mtd)->offset; ++} ++EXPORT_SYMBOL_GPL(mtdpart_get_offset); ++ + /* Returns the size of the entire flash chip */ + uint64_t mtd_get_device_size(const struct mtd_info *mtd) + { +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -90,6 +90,8 @@ int mtd_is_partition(const struct mtd_in + int mtd_add_partition(struct mtd_info *master, char *name, + long long offset, long long length); + int mtd_del_partition(struct mtd_info *master, int partno); ++struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd); ++uint64_t mtdpart_get_offset(const struct mtd_info *mtd); + 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); +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -331,6 +331,24 @@ static inline uint32_t mtd_mod_by_eb(uin + return do_div(sz, mtd->erasesize); + } + ++static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd) ++{ ++ if (mtd_mod_by_eb(sz, mtd) == 0) ++ return sz; ++ ++ /* Round up to next erase block */ ++ return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize; ++} ++ ++static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd) ++{ ++ if (mtd_mod_by_eb(sz, mtd) == 0) ++ return sz; ++ ++ /* Round down to the start of the current erase block */ ++ return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize; ++} ++ + static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd) + { + if (mtd->writesize_shift) diff --git a/target/linux/generic/patches-3.10/406-mtd-add-squashfs-parser.patch b/target/linux/generic/patches-3.10/406-mtd-add-squashfs-parser.patch new file mode 100644 index 0000000..b3ff9d9 --- /dev/null +++ b/target/linux/generic/patches-3.10/406-mtd-add-squashfs-parser.patch @@ -0,0 +1,30 @@ +--- a/drivers/mtd/Kconfig ++++ b/drivers/mtd/Kconfig +@@ -37,6 +37,17 @@ config MTD_UIMAGE_SPLIT + depends on MTD_SPLIT_FIRMWARE + default y + ++comment "Rootfs partition parsers" ++ ++config MTD_SPLIT_SQUASHFS_ROOT ++ bool "Squashfs based root partition parser" ++ select MTD_SPLIT ++ default n ++ help ++ This provides a parsing function which allows to detect the ++ offset and size of the unused portion of a rootfs partition ++ containing a squashfs. ++ + config MTD_SPLIT + def_bool n + help +--- a/drivers/mtd/Makefile ++++ b/drivers/mtd/Makefile +@@ -7,6 +7,7 @@ obj-$(CONFIG_MTD) += mtd.o + mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o mtdchar.o + + mtd-$(CONFIG_MTD_SPLIT) += mtdsplit.o ++mtd-$(CONFIG_MTD_SPLIT_SQUASHFS_ROOT) += mtdsplit_squashfs.o + + obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o + obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o |