btrfs-tools 4.4-1
gargamel:~# uname -r
4.4.2-amd64-i915-volpreempt-20160214bc2
2 drive array stopped working after a crash/reboot. Check --repair finds nothing wrong with it:
gargamel:~# btrfs check --repair /dev/mapper/raid0d1
enabling repair mode
Checking filesystem on /dev/mapper/raid0d1
UUID: 01334b81-c0db-4e80-92e4-cac4da867651
checking extents
Fixed 0 roots.
checking free space cache
cache and super generation don't match, space cache will be invalidated
checking fs roots
checking csums
checking root refs
found 1201345524312 bytes used err is 0
total csum bytes: 1165124220
total tree bytes: 8258322432
total fs tree bytes: 5574197248
total extent tree bytes: 1020428288
btree space waste bytes: 1902023247
file data blocks allocated: 1193398628352
referenced 1209324777472
gargamel:~# mount /var/local/space
mount: wrong fs type, bad option, bad superblock on /dev/mapper/raid0d1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
[ 8200.511021] BTRFS info (device dm-6): disk space caching is enabled
[ 8200.533030] BTRFS: failed to read the system array on dm-6
[ 8200.582097] BTRFS: open_ctree failed
gargamel:~# btrfs check --repair /dev/mapper/raid0d2
enabling repair mode
Checking filesystem on /dev/mapper/raid0d2
UUID: 01334b81-c0db-4e80-92e4-cac4da867651
checking extents
Fixed 0 roots.
checking free space cache
cache and super generation don't match, space cache will be invalidated
checking fs roots
checking csums
checking root refs
found 1201345540696 bytes used err is 0
total csum bytes: 1165124220
total tree bytes: 8258338816
total fs tree bytes: 5574197248
total extent tree bytes: 1020444672
btree space waste bytes: 1902039421
file data blocks allocated: 1193398628352
referenced 1209324777472
gargamel:~# mount /var/local/space
mount: wrong fs type, bad option, bad superblock on /dev/mapper/raid0d1,
[13373.606737] BTRFS info (device dm-6): disk space caching is enabled
[13373.628682] BTRFS: failed to read the system array on dm-6
[13373.672607] BTRFS: open_ctree failed
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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