7703e14bc4
On most image types the rootfs ends at an erase-block. However, at least with brnImages this is not the case: while the partitions are aligned with the erase-block size there is a 12 byte footer at the end of the partition which must not be touched by any filesystem. This lead to a rootfs_data partition which was not aligned properly (and thus ended up being readonly): 0x000000480000-0x00000085a800 : "rootfs_data" (128 KiB EB) Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> SVN-Revision: 48263
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/*
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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 = mtd_rounddown_to_eb(master->size - part->offset, master);
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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 __init mtdsplit_squashfs_init(void)
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{
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register_mtd_parser(&mtdsplit_squashfs_parser);
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return 0;
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}
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subsys_initcall(mtdsplit_squashfs_init);
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