Re: [PATCH 2/2] zram: do not count duplicated pages as compressed
From: Christoph Hellwig <hch@infradead.org>
Date: 2017-05-21 07:04:27
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linux-fsdevel, lkml
On Wed, May 17, 2017 at 05:32:12PM +0900, Minchan Kim wrote:
Is block device(esp, zram which is compressed ram block device) okay to return garbage when ongoing overwrite IO fails? O_DIRECT write 4 block "aaa.." -> success read 4 block "aaa.." -> success O_DIRECT write 4 block "bbb.." -> fail read 4 block "000..' -> it is okay? Hope to get an answer form experts. :)
It's "okay" as it's what existing real block devices do (at least on a sector boundary). It's not "nice" though, so if you can avoid it, please do.