kernel: move mtdsplit files to drivers/mtd/mtdsplit/ to simplify maintenance, unify...

[15.05/openwrt.git] / target / linux / generic / files / drivers / mtd / mtdsplit / mtdsplit_squashfs.c

diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_squashfs.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_squashfs.c
new file mode 100644 (file)
index 0000000..3d80e07
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_squashfs.c
@@ -0,0 +1,72 @@
+/*
+ *  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 __init mtdsplit_squashfs_init(void)
+{
+       register_mtd_parser(&mtdsplit_squashfs_parser);
+
+       return 0;
+}
+
+subsys_initcall(mtdsplit_squashfs_init);