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authorWeiXiong Liao <liaoweixiong@allwinnertech.com>2020-03-25 11:55:05 +0300
committerKees Cook <keescook@chromium.org>2020-06-01 05:49:00 +0300
commit7dcb7848ba110ff192efc917d1a6de66b4c9ca4f (patch)
tree53e7bdd3c266bbadeb9b7091889a736f5c76897a /Documentation/admin-guide/pstore-blk.rst
parent1525fb3bb6d69028b3941d34363397c28345ffab (diff)
downloadlinux-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.tar.xz
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 'Documentation/admin-guide/pstore-blk.rst')
-rw-r--r--Documentation/admin-guide/pstore-blk.rst17
1 files changed, 13 insertions, 4 deletions
diff --git a/Documentation/admin-guide/pstore-blk.rst b/Documentation/admin-guide/pstore-blk.rst
index bef8c7436721..d45341e55e82 100644
--- a/Documentation/admin-guide/pstore-blk.rst
+++ b/Documentation/admin-guide/pstore-blk.rst
@@ -7,8 +7,8 @@ Introduction
------------
pstore block (pstore/blk) is an oops/panic logger that writes its logs to a
-block device before the system crashes. You can get these log files by
-mounting pstore filesystem like::
+block device and non-block device before the system crashes. You can get
+these log files by mounting pstore filesystem like::
mount -t pstore pstore /sys/fs/pstore
@@ -24,8 +24,8 @@ Configurations for user determine how pstore/blk works, such as pmsg_size,
kmsg_size and so on. All of them support both Kconfig and module parameters,
but module parameters have priority over Kconfig.
-Configurations for driver are all about block device, such as total_size
-of block device and read/write operations.
+Configurations for driver are all about block device and non-block device,
+such as total_size of block device and read/write operations.
Configurations for user
-----------------------
@@ -152,6 +152,15 @@ driver uses ``register_pstore_blk`` to register to pstore/blk.
.. kernel-doc:: fs/pstore/blk.c
:identifiers: register_pstore_blk
+A non-block device driver uses ``register_pstore_device`` with
+``struct pstore_device_info`` to register to pstore/blk.
+
+.. kernel-doc:: fs/pstore/blk.c
+ :identifiers: register_pstore_device
+
+.. kernel-doc:: include/linux/pstore_blk.h
+ :identifiers: pstore_device_info
+
Compression and header
----------------------