>One of my computers got its BTRFS filesystem into a state where it would hang when trying to mount read/write. What I suspect is that there was some filesystem

>One of my computers got its BTRFS filesystem into a state where it would hang when trying to mount read/write. What I suspect is that there was some filesystem thing happening in the background when I rebooted the machine. >The first problem is directly attributable to BTRFS. There is no way a filesystem should get corrupted by a simple user-initiated reboot, regardless of what the system is doing in the background. It doesn't seem like you have any direct evidence that this has something to do with rebooting. In fact, Btrfs is much less susceptible to these sorts of problems than previous file systems. That's because writes in Btrfs are atomic, so a file is never "partially" written to disk. Either it's written, or it isn't. You can't get disk corruption from write failures. What I suppose might potentially happen is that you rebooted the system while in the middle of installing a bootloader or kernel update. I don't know if you tried mounting the partition r/w from another system or not, but assuming you didn't, it's probably more likely that something broke on your system that prevented it from remounting the partition during the boot process.