Messages in this thread | ![/](/images/icornerl.gif) | | From | Alex Tomas <> | Subject | Re: [RFC] delayed allocation for ext4 | Date | Sat, 23 Dec 2006 22:09:57 +0300 |
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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?
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