openwrtv4/target/linux/generic/patches-3.18/406-mtd-old-rootfs-squashfs-splitter.patch
John Crispin 6856535e29 kernel: move linux, part-probe dt parsing in generic code
The "linux,part-probe" dts parsing is a pretty neat generic feature.
It has been posted to kernel.org and could easily be reused by all
targets.

This change moves the patch to the 3.18 and 4.1 generic folders, and
makes the feature available to all platforms who may want to use it.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 46654
2015-08-17 06:17:37 +00:00

76 lines
2.1 KiB
Diff

--- 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
@@ -682,6 +682,47 @@ 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)
@@ -744,7 +785,10 @@ 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;
}