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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. whitequark‏ @whitequark 5 Oct 2018
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      today in cursed tech: swap files on linux. apparently swap files aren't handled via the VFS layer because FS might want to allocate... so to make hibernation possible, swap files are made from blocks that include raw offsets into the next block on the device (via @marcan42)

      4 replies 11 retweets 41 likes
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    2. whitequark‏ @whitequark 5 Oct 2018
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      that's right, a swap file is a "filesystem" unto its own. you still need to find the first header though so there's a resume_offset= kernel option that tells it where to locate it so you don't need to mount the dirty hibernated filesystem horrifying how does it even work with LVM

      5 replies 3 retweets 29 likes
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    3. Hector Martin‏ @marcan42 5 Oct 2018
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      Replying to @whitequark

      With LVM you're supposed to have an initramfs open the volume and echo the device into some /sys file to trigger the kernel to resume. same with crypto, RAID, or any other block layer transforms.

      1 reply 0 retweets 2 likes
    4. whitequark‏ @whitequark 5 Oct 2018
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      Replying to @marcan42

      horrifying

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 5 Oct 2018
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      Replying to @whitequark

      I imagine if you have a dirty/recovering RAID then you can activate that in read-only mode. And if you suspend/resume in the middle of a RAID re-stripe or similar the world might collapse into a black hole and it's all your fault.

      2:59 AM - 5 Oct 2018
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      • Jacob Tоxen Micr⬡Hex Niklas Real AI Mlkj Tony Naggs whitequark
      1 reply 0 retweets 9 likes
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        1. Real AI‏ @Luiz0x29A 5 Oct 2018
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          Replying to @marcan42 @whitequark

          why would you hibernate a server I don't know

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 5 Oct 2018
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          Replying to @Luiz0x29A @whitequark

          Hector Martin Retweeted Hector Martin

          Your laptop doesn't have RAID?https://twitter.com/marcan42/status/1025992758438182912 …

          Hector Martin added,

          Hector Martin @marcan42
          Replying to @marcan42 @hedgeberg @AbeSnowman
          At one point I had a laptop with a... rather complex RAID/crypto/LVM setup. Still only typed one passphrase on boot (for a LUKS loopfile!). There were good reasons for this mess back then, but now I just have an LVM on LUKS SSD and an LVM on raw dm-crypt HDD w/keyfile on SSD. pic.twitter.com/3oa11BqO8B
          1 reply 0 retweets 6 likes
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