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Subject: Re: [PATCH v7 09/18] pstore/blk: Introduce backend for block devices
To:     Kees Cook <keescook@chromium.org>,
        WeiXiong Liao <liaoweixiong@allwinnertech.com>
Cc:     Anton Vorontsov <anton@enomsg.org>,
        Colin Cross <ccross@android.com>,
        Tony Luck <tony.luck@intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Petr Mladek <pmladek@suse.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Rob Herring <robh@kernel.org>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mtd@lists.infradead.org
References: <20200510202436.63222-1-keescook@chromium.org>
 <20200510202436.63222-10-keescook@chromium.org>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <2b4fec3e-53f7-b8d9-49f8-d24401f83363@infradead.org>
Date:   Mon, 11 May 2020 08:36:49 -0700
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On 5/10/20 1:24 PM, Kees Cook wrote:
> diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
> index 98d2457bdd9f..92ba73bd0b62 100644
> --- a/fs/pstore/Kconfig
> +++ b/fs/pstore/Kconfig
> @@ -160,3 +160,67 @@ config PSTORE_ZONE
>  	help
>  	  The common layer for pstore/blk (and pstore/ram in the future)
>  	  to manage storage in zones.
> +
> +config PSTORE_BLK
> +	tristate "Log panic/oops to a block device"
> +	depends on PSTORE
> +	depends on BLOCK
> +	select PSTORE_ZONE
> +	default n
> +	help
> +	  This enables panic and oops message to be logged to a block dev
> +	  where it can be read back at some later point.
> +
> +	  If unsure, say N.
> +
> +config PSTORE_BLK_BLKDEV
> +	string "block device identifier"
> +	depends on PSTORE_BLK
> +	default ""
> +	help
> +	  Which block device should be used for pstore/blk.
> +
> +	  It accept the following variants:
> +	  1) <hex_major><hex_minor> device number in hexadecimal represents
> +	     itself no leading 0x, for example b302.

	     itself with no leading 0x,

> +	  2) /dev/<disk_name> represents the device number of disk
> +	  3) /dev/<disk_name><decimal> represents the device number
> +	     of partition - device number of disk plus the partition number
> +	  4) /dev/<disk_name>p<decimal> - same as the above, this form is
> +	     used when disk name of partitioned disk ends with a digit.
> +	  5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
> +	     unique id of a partition if the partition table provides it.
> +	     The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
> +	     partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
> +	     filled hex representation of the 32-bit "NT disk signature", and PP
> +	     is a zero-filled hex representation of the 1-based partition number.
> +	  6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation
> +	     to a partition with a known unique id.
> +	  7) <major>:<minor> major and minor number of the device separated by
> +	     a colon.


-- 
~Randy