Nicholas D Steeves wrote on 2016/05/15 22:11 -0400:
The volume was created with btrfs-progs-4.4.41; I upgraded to
linux-4.4.10 today, and here is what I grepped from my dmesg:
[ +0.002613] Btrfs loaded
[ +0.080621] BTRFS: device label Red devid 1 transid 108234 /dev/sda3
[ +0.000106] BTRFS: device label Red devid 2 transid 108234 /dev/sdb2
[ +0.011888] BTRFS info (device sdb2): disk space caching is enabled
[ +0.000001] BTRFS: has skinny extents
[ +0.063532] BTRFS info (device sdb2): disk space caching is enabled
[ +3.615389] BTRFS warning (device sdb2): block group 183639212032
has wrong amount of free space
[ +0.000002] BTRFS warning (device sdb2): failed to load free space
cache for block group 183639212032, rebuilding it now
[ +1.718348] BTRFS warning (device sdb2): block group 859022819328
has wrong amount of free space
[ +0.000003] BTRFS warning (device sdb2): failed to load free space
cache for block group 859022819328, rebuilding it now
[ +4.357965] BTRFS info (device sdb2): The free space cache file
(1082361118720) is invalid. skip it
[ +0.026489] BTRFS info (device sdb2): The free space cache file
(1094172278784) is invalid. skip it
[ +0.740340] BTRFS info (device sdb2): The free space cache file
(1183292850176) is invalid. skip it
[ +0.610161] BTRFS info (device sdb2): The free space cache file
(1248791101440) is invalid. skip it
[ +0.353670] BTRFS info (device sdb2): The free space cache file
(1284224581632) is invalid. skip it
What is the standard procedure for fixing the cache? Rootfs is a
subvolume and the first entry in fstab. Second entry is /btrfs-admin,
which is where I mount the whole volume. Is it sufficient to add the
clear_cache option to the rootfs entry, or does the /btrfs-admin entry
also need it?
IIRC clear_cache option is fs level option.
So the first mount with clear_cache, then all subvolume will have
clear_cache.
$ sudo mount /dev/sda6 -o subvol=sub1,clear_cache /mnt/data/
$ sudo mount /dev/sda6 -o subvol=sub2 /mnt/test/
$ mount | grep btrfs
/dev/sda6 on /mnt/data type btrfs
(rw,relatime,space_cache,clear_cache,subvolid=257,subvol=/sub1)
/dev/sda6 on /mnt/test type btrfs
(rw,relatime,space_cache,clear_cache,subvolid=258,subvol=/sub2)
Thanks,
Qu
From what I've read in the documentation one modifies fstab, reboots,
removes modification from fstab, and it's fixed.
Cheers,
Nicholas
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