67 lines
1.7 KiB
Diff
67 lines
1.7 KiB
Diff
From: Daniel Golle <daniel@makrotopia.org>
|
|
Subject: ubi: auto-create ubiblock device for rootfs
|
|
|
|
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
|
|
---
|
|
drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++
|
|
1 file changed, 42 insertions(+)
|
|
|
|
--- a/drivers/mtd/ubi/block.c
|
|
+++ b/drivers/mtd/ubi/block.c
|
|
@@ -652,6 +652,44 @@ static void __init ubiblock_create_from_
|
|
}
|
|
}
|
|
|
|
+#define UBIFS_NODE_MAGIC 0x06101831
|
|
+static inline int ubi_vol_is_ubifs(struct ubi_volume_desc *desc)
|
|
+{
|
|
+ int ret;
|
|
+ uint32_t magic_of, magic;
|
|
+ ret = ubi_read(desc, 0, (char *)&magic_of, 0, 4);
|
|
+ if (ret)
|
|
+ return 0;
|
|
+ magic = le32_to_cpu(magic_of);
|
|
+ return magic == UBIFS_NODE_MAGIC;
|
|
+}
|
|
+
|
|
+static void __init ubiblock_create_auto_rootfs(void)
|
|
+{
|
|
+ int ubi_num, ret, is_ubifs;
|
|
+ struct ubi_volume_desc *desc;
|
|
+ struct ubi_volume_info vi;
|
|
+
|
|
+ for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) {
|
|
+ desc = ubi_open_volume_nm(ubi_num, "rootfs", UBI_READONLY);
|
|
+ if (IS_ERR(desc))
|
|
+ continue;
|
|
+
|
|
+ ubi_get_volume_info(desc, &vi);
|
|
+ is_ubifs = ubi_vol_is_ubifs(desc);
|
|
+ ubi_close_volume(desc);
|
|
+ if (is_ubifs)
|
|
+ break;
|
|
+
|
|
+ ret = ubiblock_create(&vi);
|
|
+ if (ret)
|
|
+ pr_err("UBI error: block: can't add '%s' volume, err=%d\n",
|
|
+ vi.name, ret);
|
|
+ /* always break if we get here */
|
|
+ break;
|
|
+ }
|
|
+}
|
|
+
|
|
static void ubiblock_remove_all(void)
|
|
{
|
|
struct ubiblock *next;
|
|
@@ -684,6 +722,10 @@ int __init ubiblock_init(void)
|
|
*/
|
|
ubiblock_create_from_param();
|
|
|
|
+ /* auto-attach "rootfs" volume if existing and non-ubifs */
|
|
+ if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV))
|
|
+ ubiblock_create_auto_rootfs();
|
|
+
|
|
/*
|
|
* Block devices are only created upon user requests, so we ignore
|
|
* existing volumes.
|