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Date: Mon, 28 Apr 2008 09:03:58 -0400 From: Christoph Hellwig <hch@...radead.org> To: Takashi Sato <t-sato@...jp.nec.com> Cc: Christoph Hellwig <hch@...radead.org>, linux-ext4@...r.kernel.org, xfs@....sgi.com, dm-devel@...hat.com, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 1/3] Implement generic freeze feature On Mon, Apr 28, 2008 at 09:59:55PM +0900, Takashi Sato wrote: >> I think the protection against double freezes would be better done by >> using a trylock on bd_mount_sem. > > bd_mount_sem can protect against only freezes and cannot protect against > unfreezes. If multiple unfreezes run in parallel, the multiple up() for > bd_mount_sem might occur incorrectly. Indeed. The bit flag would fix that because unfreeze could then check for the bit beeing set first. So that's probably the easiest way to go. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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