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Subject[PATCH v3 00/11] pstore: mtd: support crash log to block and mtd device
Why do we need to log to block (mtd) device?
1. Most embedded intelligent equipment have no persistent ram, which
increases costs. We perfer to cheaper solutions, like block devices.
2. Do not any equipment have battery, which means that it lost all data
on general ram if power failure. Pstore has little to do for these

Why do we need mtdpstore instead of mtdoops?
1. repetitive jobs between pstore and mtdoops
Both of pstore and mtdoops do the same jobs that store panic/oops log.
2. do what a driver should do
To me, a driver should provide methods instead of policies. What MTD
should do is to provide read/write/erase operations, geting rid of codes
about chunk management, kmsg dumper and configuration.
3. enhanced feature
Not only store log, but also show it as files.
Not only log, but also trigger time and trigger count.
Not only panic/oops log, but also log recorder for pmsg, console and
ftrace in the future.

Before upstream submission, pstore/blk is tested on arch ARM and x84_64,
block device and mtd device, built as modules and in kernel. Here are the

[PATCH v3]:
1. patch 1~10: a lot of improvements according to Kees Cook <>
including rename module, typo, reorder, rewrite document, bugs
and so on.
2. patch 11: rename funtions of pstore/blk and update document.
[PATCH v2]:
1. fix syntax error in documents. Thank Randy Dunlap <>
2. replace pr_* with dev_* for mtdpstore.
Thank Vignesh Raghavendra <>
3. improve mtdpstore. Thank Miquel Raynal <>
[PATCH v1]:
1. fix errors and warnings reported by kbuild test robot.

WeiXiong Liao (11):
pstore/zone: a common layer to manage storage as zones
pstore/blk: new support logger for block devices
pstore/blk: respect for driver to pick pstore front-ends
pstore/blk: pstore/zone: support pmsg recorder
pstore/blk: blkoops: support console recorder
pstore/blk: blkoops: support ftrace recorder
Documentation: create document for pstore/blk
pstore/zone: skip broken zone for MTD device
pstore/blk: a way to get user configure about pstore front-ends.
pstore/zone: pstore/blk: support non-block devices
mtd: new support oops logger based on pstore/blk

Documentation/admin-guide/pstore-block.rst | 237 +++++
drivers/mtd/Kconfig | 10 +
drivers/mtd/Makefile | 1 +
drivers/mtd/mtdpstore.c | 564 +++++++++++
fs/pstore/Kconfig | 107 ++
fs/pstore/Makefile | 4 +
fs/pstore/platform.c | 3 +-
fs/pstore/pstore_blk.c | 480 +++++++++
fs/pstore/pstore_zone.c | 1511 ++++++++++++++++++++++++++++
include/linux/pstore.h | 1 +
include/linux/pstore_blk.h | 77 ++
include/linux/pstore_zone.h | 60 ++
13 files changed, 3055 insertions(+), 1 deletion(-)
create mode 100644 Documentation/admin-guide/pstore-block.rst
create mode 100644 drivers/mtd/mtdpstore.c
create mode 100644 fs/pstore/pstore_blk.c
create mode 100644 fs/pstore/pstore_zone.c
create mode 100644 include/linux/pstore_blk.h
create mode 100644 include/linux/pstore_zone.h


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