diff options
Diffstat (limited to 'target/linux/generic/pending-4.14/491-ubi-auto-create-ubiblock-device-for-rootfs.patch')
| -rw-r--r-- | target/linux/generic/pending-4.14/491-ubi-auto-create-ubiblock-device-for-rootfs.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/491-ubi-auto-create-ubiblock-device-for-rootfs.patch b/target/linux/generic/pending-4.14/491-ubi-auto-create-ubiblock-device-for-rootfs.patch new file mode 100644 index 0000000..f8dc1bc --- /dev/null +++ b/target/linux/generic/pending-4.14/491-ubi-auto-create-ubiblock-device-for-rootfs.patch @@ -0,0 +1,66 @@ +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 +@@ -625,6 +625,44 @@ 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; +@@ -655,6 +693,10 @@ 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. |