From: Daniel Golle Subject: ubi: auto-create ubiblock device for rootfs Signed-off-by: Daniel Golle --- drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -644,10 +644,47 @@ match_volume_desc(struct ubi_volume_info return true; } +#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(struct ubi_volume_info *vi) +{ + int ret, is_ubifs; + struct ubi_volume_desc *desc; + + if (strcmp(vi->name, "rootfs") && + strcmp(vi->name, "fit")) + return; + + desc = ubi_open_volume(vi->ubi_num, vi->vol_id, UBI_READONLY); + if (IS_ERR(desc)) + return; + + is_ubifs = ubi_vol_is_ubifs(desc); + ubi_close_volume(desc); + if (is_ubifs) + return; + + ret = ubiblock_create(vi); + if (ret) + pr_err("UBI error: block: can't add '%s' volume, err=%d\n", + vi->name, ret); +} + static void ubiblock_create_from_param(struct ubi_volume_info *vi) { int i, ret = 0; + bool got_param = false; struct ubiblock_param *p; /* @@ -660,6 +697,7 @@ ubiblock_create_from_param(struct ubi_vo if (!match_volume_desc(vi, p->name, p->ubi_num, p->vol_id)) continue; + got_param = true; ret = ubiblock_create(vi); if (ret) { pr_err( @@ -668,6 +706,10 @@ ubiblock_create_from_param(struct ubi_vo } break; } + + /* auto-attach "rootfs" volume if existing and non-ubifs */ + if (!got_param && IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV)) + ubiblock_create_auto_rootfs(vi); } static int ubiblock_notify(struct notifier_block *nb,