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Message-ID: <20061223092718.GA26276@infradead.org> Date: Sat, 23 Dec 2006 09:27:18 +0000 From: Christoph Hellwig <hch@...radead.org> To: David Chinner <dgc@....com> Cc: Alex Tomas <alex@...sterfs.com>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC] delayed allocation for ext4 On Sat, Dec 23, 2006 at 02:31:23PM +1100, David Chinner wrote: > > - ext4-delayed-allocation.patch > > delayed allocation itself, enabled by "delalloc" mount option. > > extents support is also required. currently it works only > > with blocksize=pagesize. > > Ah, that's why you can get away with a page flag - you've ignored > the partial page delay state problem. Any plans to use the > existing method in the future so we will be able to use ext4 delalloc > on machines with a page size larger than 4k? I think fixing this up for blocksize < pagesize is an absolute requirement to get things merged. We don't need more filesystems that are crippled on half of our platforms. Note that recording delayed alloc state at a page granularity in addition to just the buffer heads has a lot of advantages aswell and would help xfs, too. But I think it makes a lot more sense to record it as a radix tree tag to speed up the gang lookups for delalloc conversion. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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