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--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -18,6 +18,11 @@ config MTD_ROOTFS_ROOT_DEV
bool "Automatically set 'rootfs' partition to be root filesystem"
default y
+config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ select MTD_SPLIT
+ default y
+
config MTD_SPLIT_FIRMWARE
bool "Automatically split firmware partition for kernel+rootfs"
default y
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -680,6 +680,47 @@ mtd_pad_erasesize(struct mtd_info *mtd,
return len;
}
+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
+{
+ size_t squashfs_len;
+ int len, ret;
+
+ ret = mtd_get_squashfs_len(master, offset, &squashfs_len);
+ if (ret)
+ return ret;
+
+ len = mtd_pad_erasesize(master, offset, squashfs_len);
+ *split_offset = offset + len;
+
+ return 0;
+}
+
+static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part)
+{
+ unsigned int split_offset = 0;
+ unsigned int split_size;
+ int ret;
+
+ ret = split_squashfs(master, part->offset, &split_offset);
+ if (ret)
+ return;
+
+ if (split_offset <= 0)
+ return;
+
+ if (config_enabled(CONFIG_MTD_SPLIT_SQUASHFS_ROOT))
+ pr_err("Dedicated partitioner didn't create \"rootfs_data\" partition, please fill a bug report!\n");
+ else
+ pr_warn("Support for built-in \"rootfs_data\" splitter will be removed, please use CONFIG_MTD_SPLIT_SQUASHFS_ROOT\n");
+
+ split_size = part->mtd.size - (split_offset - part->offset);
+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n",
+ ROOTFS_SPLIT_NAME, split_offset, split_size);
+
+ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset,
+ split_size, false);
+}
+
#define UBOOT_MAGIC 0x27051956
static void split_uimage(struct mtd_info *master, struct mtd_part *part)
@@ -742,7 +783,10 @@ static void mtd_partition_split(struct m
return;
if (!strcmp(part->mtd.name, "rootfs")) {
- run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
+ int num = run_parsers_by_type(part, MTD_PARSER_TYPE_ROOTFS);
+
+ if (num <= 0 && config_enabled(CONFIG_MTD_ROOTFS_SPLIT))
+ split_rootfs_data(master, part);
rootfs_found = 1;
}
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