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- 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
- @@ -635,6 +635,44 @@ 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;
- @@ -667,6 +705,10 @@ 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.
|
