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| 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_zone.h | |
| parent | 1525fb3bb6d69028b3941d34363397c28345ffab (diff) | |
| download | lwn-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.tar.gz lwn-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.zip | |
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_zone.h')
| -rw-r--r-- | include/linux/pstore_zone.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/pstore_zone.h b/include/linux/pstore_zone.h index e79a18e41064..1e35eaa33e5e 100644 --- a/include/linux/pstore_zone.h +++ b/include/linux/pstore_zone.h @@ -7,6 +7,7 @@ typedef ssize_t (*pstore_zone_read_op)(char *, size_t, loff_t); typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t); +typedef ssize_t (*pstore_zone_erase_op)(size_t, loff_t); /** * struct pstore_zone_info - pstore/zone back-end driver structure * @@ -27,6 +28,10 @@ typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t); * @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. @@ -45,6 +50,7 @@ struct pstore_zone_info { unsigned long ftrace_size; pstore_zone_read_op read; pstore_zone_write_op write; + pstore_zone_erase_op erase; pstore_zone_write_op panic_write; }; |