Hi again, Le 27/08/2019 à 08:21, Qu Wenruo a écrit : > I'd prefer to do a "btrfs check --readonly" anyway (which also checks > free space cache), then go nospace_cache if you're concerned.
Here's what I dit, here's what I got...: root@PartedMagic:~# uname -r 5.1.5-pmagic64 root@PartedMagic:~# btrfs --version btrfs-progs v5.1 root@PartedMagic:~# btrfs check --readonly /dev/PPL_VG1/LINUX [1/7] checking root items [2/7] checking extents [3/7] checking free space cache block group 52677312512 has wrong amount of free space, free space cache has 266551296 block group has 266584064 failed to load free space cache for block group 52677312512 [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) Opening filesystem to check... Checking filesystem on /dev/PPL_VG1/LINUX UUID: 25fede5a-d8c2-4c7e-9e7e-b19aad319044 found 87804731392 bytes used, no error found total csum bytes: 79811080 total tree bytes: 2195832832 total fs tree bytes: 1992900608 total extent tree bytes: 101548032 btree space waste bytes: 380803707 file data blocks allocated: 626135830528 referenced 124465221632 root@PartedMagic:~# mkdir /hd root@PartedMagic:~# mount -t btrfs -o noatime,clear_cache /dev/PPL_VG1/LINUX /hd (Waited for no disk activity and top showing no btrfs processes) root@PartedMagic:~# umount /hd root@PartedMagic:~# mount -t btrfs -o noatime /dev/PPL_VG1/LINUX /hd root@PartedMagic:~# grep btrfs /proc/self/mountinfo 40 31 0:43 / /hd rw,noatime - btrfs /dev/mapper/PPL_VG1-LINUX rw,ssd,space_cache,subvolid=5,subvol=/ root@PartedMagic:~# umount /hd root@PartedMagic:~# btrfs check --readonly /dev/PPL_VG1/LINUX [1/7] checking root items [2/7] checking extents [3/7] checking free space cache block group 52677312512 has wrong amount of free space, free space cache has 266551296 block group has 266584064 failed to load free space cache for block group 52677312512 [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) Opening filesystem to check... Checking filesystem on /dev/PPL_VG1/LINUX UUID: 25fede5a-d8c2-4c7e-9e7e-b19aad319044 found 87804207104 bytes used, no error found total csum bytes: 79811080 total tree bytes: 2195832832 total fs tree bytes: 1992900608 total extent tree bytes: 101548032 btree space waste bytes: 380804019 file data blocks allocated: 626135306240 referenced 124464697344 root@PartedMagic:~# So it seems that mounting with “clear_cache” did not actually clear the cache and fix the issue ? ॐ -- Swâmi Petaramesh <sw...@petaramesh.org> PGP 9076E32E
