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
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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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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#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 <linux/byteorder/generic.h>
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#include "mtdsplit.h"
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#define SEAMA_MAGIC 0x5EA3A417
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#define SEAMA_NR_PARTS 2
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#define SEAMA_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
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struct seama_header {
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__be32 magic; /* should always be SEAMA_MAGIC. */
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__be16 reserved; /* reserved for */
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__be16 metasize; /* size of the META data */
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__be32 size; /* size of the image */
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};
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static int mtdsplit_parse_seama(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 seama_header hdr;
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size_t hdr_len, retlen, kernel_ent_size;
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size_t rootfs_offset;
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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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/* sanity checks */
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if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC)
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return -EINVAL;
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kernel_ent_size = hdr_len + be32_to_cpu(hdr.size) +
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be16_to_cpu(hdr.metasize);
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if (kernel_ent_size > master->size)
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return -EINVAL;
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/* Check for the rootfs right after Seama entity with a kernel. */
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err = mtd_check_rootfs_magic(master, kernel_ent_size, NULL);
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if (!err) {
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rootfs_offset = kernel_ent_size;
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} else {
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/*
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* On some devices firmware entity might contain both: kernel
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* and rootfs. We can't determine kernel size so we just have to
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* look for rootfs magic.
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* Start the search from an arbitrary offset.
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*/
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err = mtd_find_rootfs_from(master, SEAMA_MIN_ROOTFS_OFFS,
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master->size, &rootfs_offset, NULL);
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if (err)
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return err;
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}
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parts = kzalloc(SEAMA_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 SEAMA_NR_PARTS;
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}
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static struct mtd_part_parser mtdsplit_seama_parser = {
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.owner = THIS_MODULE,
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.name = "seama-fw",
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.parse_fn = mtdsplit_parse_seama,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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static int __init mtdsplit_seama_init(void)
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{
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register_mtd_parser(&mtdsplit_seama_parser);
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return 0;
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}
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subsys_initcall(mtdsplit_seama_init);
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