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Date: Sat, 23 Dec 2006 22:09:57 +0300 From: Alex Tomas <alex@...sterfs.com> 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 Good day, >>>>> David Chinner (DC) writes: DC> So that mean's we'll have 2 separate mechanisms for marking DC> pages as delalloc. XFS uses the BH_delay flag to indicate DC> that a buffer (block) attached to the page is using delalloc. well, for blocksize=pagesize we can save 56 bytes on every page. DC> FWIW, how does this mechanism deal with block size < page size? DC> Don't you have to track delalloc on a block basis rather than DC> a page basis? I'm still thinking how better to deal with that w/o much code duplication. DC> Ah, that's why you can get away with a page flag - you've ignored DC> the partial page delay state problem. Any plans to use the DC> existing method in the future so we will be able to use ext4 delalloc DC> on machines with a page size larger than 4k? what do you mean by "exsiting"? BH_delay? thanks, Alex - 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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