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Date: Fri, 8 Feb 2002 13:31:07 +0100
Message-Id: <200202081231.g18CV7e31341@ns.caldera.de>
From: Christoph Hellwig <hch@ns.caldera.de>
To: mingo@elte.hu (Ingo Molnar)
Cc: Martin Wirth <Martin.Wirth@dlr.de>,
        linux-kernel <linux-kernel@vger.kernel.org>, akpm <akpm@zip.com.au>,
        torvalds <torvalds@transmet.com>, rml <rml@tech9.net>,
        nigel <nigel@nrg.org>
To: yodaiken <yodaiken@fsmlabs.com>
Subject: Re: [RFC] New locking primitive for 2.5
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In article <Pine.LNX.4.33.0202072305480.2976-100000@localhost.localdomain> you wrote:
> i think one example *could* be to turn inode->i_sem into a combi-lock. Eg.
> generic_file_llseek() could use the spin variant.

No.  i_sem should be split into a spinlock for short-time accessed
fields that get written to even if the file content is only read (i.e.
atime) and a read-write semaphore.

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