send/receive locking

Hugo Mills
2014-03-08T21:53:50Z

Is there anything that can be done about the issues of btrfs send
blocking? I've been writing a backup script (slowly), and several
times I've managed to hit a situation where large chunks of the
machine grind to a complete halt in D state because the backup script
has jammed up.

   Now, I'm aware that you can't send and receive to the same
filesystem at the same time, and that's a restriction I can live with.
However, having things that aren't related to the backup process
suddenly stop working because the backup script is trying to log its
progress to the same FS it's backing up is... umm... somewhat vexing,
to say the least.

   Is this a truly fundamental property of send/receive, or is there
likely to be a simple(ish) solution?

   Hugo.

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