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Re: [PATCH 2/2] zram: do not count duplicated pages as compressed

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 2/2] zram: do not count duplicated pages as compressed
Date 2017-05-21 09:10 +0200
Message-ID <tJta1-4G5-1@gated-at.bofh.it> (permalink)
References <tHFfk-2DH-13@gated-at.bofh.it> <tI2Yh-Rs-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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.

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[PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-15 09:50 +0200
  Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-05-16 03:40 +0200
    Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-16 04:00 +0200
      Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-05-16 04:40 +0200
        Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-16 07:30 +0200
          Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-05-16 07:50 +0200
            Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-16 09:20 +0200
              Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-05-16 09:40 +0200
                Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-17 11:00 +0200
                Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-05-17 11:20 +0200
                Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-18 07:00 +0200
                Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Christoph Hellwig <hch@infradead.org> - 2017-05-21 09:10 +0200
                Re: [PATCH 2/2] zram: do not count duplicated pages as compressed Minchan Kim <minchan@kernel.org> - 2017-05-21 09:20 +0200

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