kernel/3.10: add separate rootfs partition parser
Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 38110
This commit is contained in:
Gabor Juhos
parent
d89bea92b3
commit
daec7ad768
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@ -1935,6 +1935,7 @@ CONFIG_MTD_ROOTFS_SPLIT=y
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CONFIG_MTD_SPLIT=y
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# CONFIG_MTD_SPLIT_FIRMWARE is not set
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CONFIG_MTD_SPLIT_FIRMWARE_NAME="firmware"
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# CONFIG_MTD_SPLIT_SQUASHFS_ROOT is not set
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# CONFIG_MTD_SST25L is not set
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# CONFIG_MTD_SWAP is not set
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# CONFIG_MTD_TESTS is not set
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71
target/linux/generic/files/drivers/mtd/mtdsplit_squashfs.c
Normal file
71
target/linux/generic/files/drivers/mtd/mtdsplit_squashfs.c
Normal file
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@ -0,0 +1,71 @@
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/*
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* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/magic.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/byteorder/generic.h>
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#include "mtdsplit.h"
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static int
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mtdsplit_parse_squashfs(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct mtd_partition *part;
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struct mtd_info *parent_mtd;
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size_t part_offset;
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size_t squashfs_len;
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int err;
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err = mtd_get_squashfs_len(master, 0, &squashfs_len);
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if (err)
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return err;
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parent_mtd = mtdpart_get_master(master);
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part_offset = mtdpart_get_offset(master);
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part = kzalloc(sizeof(*part), GFP_KERNEL);
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if (!part) {
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pr_alert("unable to allocate memory for \"%s\" partition\n",
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ROOTFS_SPLIT_NAME);
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return -ENOMEM;
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}
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part->name = ROOTFS_SPLIT_NAME;
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part->offset = mtd_roundup_to_eb(part_offset + squashfs_len,
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parent_mtd) - part_offset;
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part->size = master->size - part->offset;
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*pparts = part;
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return 1;
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}
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static struct mtd_part_parser mtdsplit_squashfs_parser = {
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.owner = THIS_MODULE,
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.name = "squashfs-split",
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.parse_fn = mtdsplit_parse_squashfs,
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.type = MTD_PARSER_TYPE_ROOTFS,
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};
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static int
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mtdsplit_squashfs_init(void)
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{
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return register_mtd_parser(&mtdsplit_squashfs_parser);
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}
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subsys_initcall(mtdsplit_squashfs_init);
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@ -0,0 +1,83 @@
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -435,14 +435,12 @@ static struct mtd_part *allocate_partiti
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if (slave->offset == MTDPART_OFS_APPEND)
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slave->offset = cur_offset;
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if (slave->offset == MTDPART_OFS_NXTBLK) {
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- slave->offset = cur_offset;
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- if (mtd_mod_by_eb(cur_offset, master) != 0) {
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- /* Round up to next erasesize */
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- slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
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+ /* Round up to next erasesize */
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+ slave->offset = mtd_roundup_to_eb(cur_offset, master);
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+ if (slave->offset != cur_offset)
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printk(KERN_NOTICE "Moving partition %d: "
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"0x%012llx -> 0x%012llx\n", partno,
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(unsigned long long)cur_offset, (unsigned long long)slave->offset);
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- }
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}
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if (slave->offset == MTDPART_OFS_RETAIN) {
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slave->offset = cur_offset;
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@@ -996,6 +994,24 @@ int mtd_is_partition(const struct mtd_in
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}
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EXPORT_SYMBOL_GPL(mtd_is_partition);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return (struct mtd_info *)mtd;
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+
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+ return PART(mtd)->master;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_master);
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+
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return 0;
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+
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+ return PART(mtd)->offset;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_offset);
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+
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/* Returns the size of the entire flash chip */
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uint64_t mtd_get_device_size(const struct mtd_info *mtd)
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{
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--- a/include/linux/mtd/partitions.h
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+++ b/include/linux/mtd/partitions.h
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@@ -90,6 +90,8 @@ int mtd_is_partition(const struct mtd_in
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int mtd_add_partition(struct mtd_info *master, char *name,
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long long offset, long long length);
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int mtd_del_partition(struct mtd_info *master, int partno);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd);
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uint64_t mtd_get_device_size(const struct mtd_info *mtd);
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extern void __weak arch_split_mtd_part(struct mtd_info *master,
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const char *name, int offset, int size);
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -331,6 +331,24 @@ static inline uint32_t mtd_mod_by_eb(uin
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return do_div(sz, mtd->erasesize);
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}
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+static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round up to next erase block */
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+ return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize;
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+}
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+
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+static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round down to the start of the current erase block */
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+ return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize;
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+}
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+
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static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->writesize_shift)
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@ -0,0 +1,30 @@
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -37,6 +37,17 @@ config MTD_UIMAGE_SPLIT
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depends on MTD_SPLIT_FIRMWARE
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default y
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+comment "Rootfs partition parsers"
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+
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+config MTD_SPLIT_SQUASHFS_ROOT
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+ bool "Squashfs based root partition parser"
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+ select MTD_SPLIT
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+ default n
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+ help
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+ This provides a parsing function which allows to detect the
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+ offset and size of the unused portion of a rootfs partition
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+ containing a squashfs.
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+
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config MTD_SPLIT
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def_bool n
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help
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--- a/drivers/mtd/Makefile
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+++ b/drivers/mtd/Makefile
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@@ -7,6 +7,7 @@ obj-$(CONFIG_MTD) += mtd.o
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mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o mtdchar.o
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mtd-$(CONFIG_MTD_SPLIT) += mtdsplit.o
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+mtd-$(CONFIG_MTD_SPLIT_SQUASHFS_ROOT) += mtdsplit_squashfs.o
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obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
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obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
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