linux-kernel - Re: [PATCH 01/17] pramfs: documentation

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Message-ID: <4D281D65.1070102@gmail.com>
Date:	Sat, 08 Jan 2011 09:16:37 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Tony Luck <tony.luck@...el.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Tim Bird <tim.bird@...sony.com>
Subject: Re: [PATCH 01/17] pramfs: documentation

On 07/01/2011 22:59, Tony Luck wrote:
> On Fri, Jan 7, 2011 at 12:30 PM, Marco Stornelli
> <marco.stornelli@...il.com> wrote:
>> constraint). About the errors: pramfs does not maintain file data in the
>> page caches for normal file I/O, so no writeback, the read/write
>> operation are done with direct io and they are always sync. The data are
>> write protected in hw when the arch provide this facility (x86 does).
>> Inode contains a checksum and when there are problems they are marked as
>> bad. Superblock contains checksum and there is a redundant superblock.
> 
> But you can still get pramfs inconsistencies if the system crashes at an
> inopportune moment. E.g. when making files you write the new inode to
> pramfs, and then you insert the entry into the directory. A crash between
> these two operations leaves an allocated inode that doesn't appear in
> any directory.  Without a fsck option, it will be hard to see that you have
> this problem, and your only recovery option is to wipe *all* files by making
> a new filesystem.

Is it a problem if you lost some logs? However do you expect that fsck
in this case will drop the inode?
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