kernel/3.10: add separate rootfs partition parser

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38110 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 71 insertions, 0 deletions

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 0000000000..7953e8c382
--- /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);