e1491b341b
Our mtdsplit parsers may want to create partition with name choice based on partition file system (e.g. SquashFS vs. JFFS2). This patch allows passing extra argument pointing to variable that will be set properly. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 48598
96 lines
2 KiB
C
96 lines
2 KiB
C
/*
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* Copyright (C) 2014 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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#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/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <asm/unaligned.h>
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#include "mtdsplit.h"
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#define LZMA_NR_PARTS 2
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#define LZMA_PROPERTIES_SIZE 5
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struct lzma_header {
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u8 props[LZMA_PROPERTIES_SIZE];
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u8 size_low[4];
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u8 size_high[4];
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};
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static int mtdsplit_parse_lzma(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 lzma_header hdr;
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size_t hdr_len, retlen;
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size_t rootfs_offset;
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u32 t;
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struct mtd_partition *parts;
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int err;
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hdr_len = sizeof(hdr);
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err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
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if (err)
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return err;
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if (retlen != hdr_len)
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return -EIO;
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/* verify LZMA properties */
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if (hdr.props[0] >= (9 * 5 * 5))
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return -EINVAL;
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t = get_unaligned_le32(&hdr.props[1]);
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if (!is_power_of_2(t))
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return -EINVAL;
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t = get_unaligned_le32(&hdr.size_high);
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if (t)
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return -EINVAL;
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err = mtd_find_rootfs_from(master, master->erasesize, master->size,
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&rootfs_offset, NULL);
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if (err)
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return err;
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parts = kzalloc(LZMA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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parts[0].name = KERNEL_PART_NAME;
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parts[0].offset = 0;
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parts[0].size = rootfs_offset;
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parts[1].name = ROOTFS_PART_NAME;
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parts[1].offset = rootfs_offset;
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parts[1].size = master->size - rootfs_offset;
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*pparts = parts;
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return LZMA_NR_PARTS;
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}
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static struct mtd_part_parser mtdsplit_lzma_parser = {
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.owner = THIS_MODULE,
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.name = "lzma-fw",
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.parse_fn = mtdsplit_parse_lzma,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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static int __init mtdsplit_lzma_init(void)
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{
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register_mtd_parser(&mtdsplit_lzma_parser);
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return 0;
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}
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subsys_initcall(mtdsplit_lzma_init);
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