From e3eb3799f7e0d0924ceeba672ab271865de2802d Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Tue, 12 Jan 2016 07:49:36 +0100 Subject: lightnvm: core on-disk initialization MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit An Open-Channel SSD shall be initialized before use. To initialize, we define an on-disk format, that keeps a small set of metadata to bring up the media manager on top of the device. The initial step is introduced to allow a user to format the disks for a given media manager. During format, a system block is stored on one to three separate luns on the device. Each lun has the system block duplicated. During initialization, the system block can be retrieved and the appropriate media manager can initialized. The on-disk format currently covers (struct nvm_system_block): - Magic value "NVMS". - Monotonic increasing sequence number. - The physical block erase count. - Version of the system block format. - Media manager type. - Media manager superblock physical address. The interface provides three functions to manage the system block: int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *) int nvm_get_sysblock(struct nvm *dev, struct nvm_sb_info *) int nvm_update_sysblock(struct nvm *dev, struct nvm_sb_info *) Each implement a part of the logic to manage the system block. The initialization creates the first system blocks and mark them on the device. Get retrieves the latest system block by scanning all pages in the associated system blocks. The update sysblock writes new metadata and allocates new block if necessary. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- include/uapi/linux/lightnvm.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux/lightnvm.h') diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h index 928f98997d8a..0171b85e7efc 100644 --- a/include/uapi/linux/lightnvm.h +++ b/include/uapi/linux/lightnvm.h @@ -33,6 +33,7 @@ #define NVM_TTYPE_NAME_MAX 48 #define NVM_TTYPE_MAX 63 +#define NVM_MMTYPE_LEN 8 #define NVM_CTRL_FILE "/dev/lightnvm/control" -- cgit v1.2.3-59-g8ed1b