The copy problem is really the backup problem

Posted Jun 19, 2019 21:32 UTC (Wed) by nix (subscriber, #2304)
In reply to: The copy problem is really the backup problem by mcr
Parent article: The Linux "copy problem"

btrfs send and receive are not regular I/O, so they work fine. (Though I'm not sure what happens in conjunction with O_DIRECT, which is a bit... hard to grasp the semantics of on a CoW filesystem in any case.)

(You don't get -ETXTBSY if you read a file in any case, only if you try to modify it.)