I had 3 x 3 TB drives in an almost full btrfs raid1 setup containing
only large (~20 GB) files linearly written and not modified after.
Then one of the drives got busted.
> Mounting the fs in degraded mode
and adding a new fresh drive to rebuild raid1, generated several
"...blocked for more than 120 seconds." messages. I left it running
for a couple of days, but "btrfs device add..." command wouldn't
return. I did a hard reboot, and after a degraded mount, am unable to
unmount, or add a drive or delete missing without getting stuck with
the same error. iostat shows no disk activity. When attempting an
unmount, both "umount" and "[btrfs-transacti]" processes become
defunct. Tried -o skip_balance as well to no avail.
# btrfs fi show
Label: 'cohenraid1' uuid: 288723c3-2e98-4a6c-87d3-058451d87d26
Total devices 3 FS bytes used 3.44TiB
devid 1 size 2.73TiB used 2.19TiB path /dev/sdg1
devid 2 size 2.73TiB used 2.46TiB path /dev/sdf1
*** Some devices missing
the below patch would add ambiguity in the situation like this,
We would not know a critical info - whether the btrfs kernel
knows about the missing device...
http://marc.info/?l=linux-btrfs&m=139175679431525&w=2
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