linux-kernel - Re: ext4 superblock last write time clearly isnt the last write time

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Message-ID: <m2r4xlp5u3.fsf@firstfloor.org>
Date:	Thu, 23 Feb 2012 14:01:24 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Neil Clarkson <neilaclarkson@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ext4 superblock last write time clearly isnt the last write time

Neil Clarkson <neilaclarkson@...il.com> writes:

> Isn't the s_wtime field of the ext4 superblock supposed to show the
> time, in seconds since the epoch, of the last write to the file
> system? 

Last write to the super block. Obviously last write to the file system
would be incredible expensive: every write to the file system would
cause a super block write too, doubling all write IO.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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