diff options
| author | WeiXiong Liao <liaoweixiong@allwinnertech.com> | 2020-03-25 16:55:05 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-05-31 19:49:00 -0700 |
| commit | 7dcb7848ba110ff192efc917d1a6de66b4c9ca4f (patch) | |
| tree | 53e7bdd3c266bbadeb9b7091889a736f5c76897a /include/linux/pstore_blk.h | |
| parent | 1525fb3bb6d69028b3941d34363397c28345ffab (diff) | |
pstore/blk: Support non-block storage devices
Add support for non-block devices (e.g. MTD). A non-block driver calls
pstore_blk_register_device() to register iself.
In addition, pstore/zone is updated to handle non-block devices,
where an erase must be done before a write. Without this, there is no
way to remove records stored to an MTD.
Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-10-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/linux/pstore_blk.h')
| -rw-r--r-- | include/linux/pstore_blk.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h index 0c40774e71e0..61e914522b01 100644 --- a/include/linux/pstore_blk.h +++ b/include/linux/pstore_blk.h @@ -50,6 +50,44 @@ int register_pstore_blk(struct pstore_blk_info *info); void unregister_pstore_blk(unsigned int major); /** + * struct pstore_device_info - back-end pstore/blk driver structure. + * + * @total_size: The total size in bytes pstore/blk can use. It must be greater + * than 4096 and be multiple of 4096. + * @flags: Refer to macro starting with PSTORE_FLAGS defined in + * linux/pstore.h. It means what front-ends this device support. + * Zero means all backends for compatible. + * @read: The general read operation. Both of the function parameters + * @size and @offset are relative value to bock device (not the + * whole disk). + * On success, the number of bytes should be returned, others + * means error. + * @write: The same as @read, but the following error number: + * -EBUSY means try to write again later. + * -ENOMSG means to try next zone. + * @erase: The general erase operation for device with special removing + * job. Both of the function parameters @size and @offset are + * relative value to storage. + * Return 0 on success and others on failure. + * @panic_write:The write operation only used for panic case. It's optional + * if you do not care panic log. The parameters are relative + * value to storage. + * On success, the number of bytes should be returned, others + * excluding -ENOMSG mean error. -ENOMSG means to try next zone. + */ +struct pstore_device_info { + unsigned long total_size; + unsigned int flags; + pstore_zone_read_op read; + pstore_zone_write_op write; + pstore_zone_erase_op erase; + pstore_zone_write_op panic_write; +}; + +int register_pstore_device(struct pstore_device_info *dev); +void unregister_pstore_device(struct pstore_device_info *dev); + +/** * struct pstore_blk_config - the pstore_blk backend configuration * * @device: Name of the desired block device |