Hi all,
I executed the following simple sequence of commands:
# mount /dev/sda /mnt/btrfs
# btrfs quota enable /mnt/btrfs/
# btrfs subvolume create /mnt/btrfs/SV
Create subvolume '/mnt/btrfs/SV'
# btrfs qgroup limit 1m /mnt/btrfs/SV
# dd if=/dev/zero of=/mnt/btrfs/SV/file bs=64x1024
dd: writing `/mnt/btrfs/SV/file': Disk quota exceeded
16+0 records in
15+0 records out
983040 bytes (983 kB) copied, 0.00192474 s, 511 MB/s
# rm /mnt/btrfs/SV/file
The file was removed, but in the kern.log I see:
[67577.594688] [ cut here ]
[67577.594723] WARNING: at /source/fs/btrfs/inode.c:7177
btrfs_destroy_inode+0x266/0x300 [btrfs]()
[67577.594726] Hardware name: Bochs
[67577.594728] Modules linked in: btrfs(O) libcrc32c deflate zlib_deflate
ctr twofish_generic twofish_x86_64_3way glue_helper lrw xts gf128mul
twofish_x86_64 twofish_common camellia_generic serpent_generic
blowfish_generic blowfish_x86_64 blowfish_common cast5_generic des_generic
xcbc rmd160 sha512_generic crypto_null af_key xfrm_algo kvm ppdev microcode
psmouse nfsv4 serio_raw nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc
parport_pc mac_hid i2c_piix4 lp parport floppy [last unloaded: btrfs]
[67577.594788] Pid: 10692, comm: rm Tainted: GW O 3.7.0-560-generic
#57ba86c00f9573b63b8c06810d4f6915efed2442
[67577.594790] Call Trace:
[67577.594804] [] warn_slowpath_common+0x7f/0xc0
[67577.594810] [] warn_slowpath_null+0x1a/0x20
[67577.594830] [] btrfs_destroy_inode+0x266/0x300 [btrfs]
[67577.594838] [] destroy_inode+0x3c/0x70
[67577.594843] [] evict+0x136/0x1d0
[67577.594849] [] iput_final+0xe2/0x170
[67577.594853] [] iput+0x3e/0x50
[67577.594859] [] do_unlinkat+0x12b/0x1d0
[67577.594867] [] ? do_page_fault+0xe/0x10
[67577.594871] [] ? do_async_page_fault+0x35/0xa0
[67577.594877] [] sys_unlinkat+0x22/0x40
[67577.594883] [] system_call_fastpath+0x16/0x1b
[67577.594886] ---[ end trace 0b7f0b925e0b6048 ]---
[67577.594888] [ cut here ]
[67577.594906] WARNING: at /source/fs/btrfs/inode.c:7178
btrfs_destroy_inode+0x2ef/0x300 [btrfs]()
[67577.594908] Hardware name: Bochs
[67577.594910] Modules linked in: btrfs(O) libcrc32c deflate zlib_deflate
ctr twofish_generic twofish_x86_64_3way glue_helper lrw xts gf128mul
twofish_x86_64 twofish_common camellia_generic serpent_generic
blowfish_generic blowfish_x86_64 blowfish_common cast5_generic des_generic
xcbc rmd160 sha512_generic crypto_null af_key xfrm_algo kvm ppdev microcode
psmouse nfsv4 serio_raw nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc
parport_pc mac_hid i2c_piix4 lp parport floppy [last unloaded: btrfs]
[67577.594979] Pid: 10692, comm: rm Tainted: GW O 3.7.0-560-generic
#57ba86c00f9573b63b8c06810d4f6915efed2442
[67577.594981] Call Trace:
[67577.594988] [] warn_slowpath_common+0x7f/0xc0
[67577.594993] [] warn_slowpath_null+0x1a/0x20
[67577.595012] [] btrfs_destroy_inode+0x2ef/0x300 [btrfs]
[67577.595017] [] destroy_inode+0x3c/0x70
[67577.595022] [] evict+0x136/0x1d0
[67577.595027] [] iput_final+0xe2/0x170
[67577.595032] [] iput+0x3e/0x50
[67577.595037] [] do_unlinkat+0x12b/0x1d0
[67577.595042] [] ? do_page_fault+0xe/0x10
[67577.595046] [] ? do_async_page_fault+0x35/0xa0
[67577.595051] [] sys_unlinkat+0x22/0x40
[67577.595056] [] system_call_fastpath+0x16/0x1b
[67577.595059] ---[ end trace 0b7f0b925e0b6049 ]---
Then, when I delete the subvolume and unmount the file system I also get
warnings:
# btrfs subvolume delete /mnt/btrfs/SV
Delete subvolume '/mnt/btrfs/SV'
# umount /mnt/btrfs
[67847.557519] [ cut here ]
[67847.557550] WARNING: at /source/fs/btrfs/extent-tree.c:4366
btrfs_free_block_groups+0x2ce/0x370 [btrfs]()
[67847.557553] Hardware name: Bochs
[67847.557554] Modules linked in: btrfs(O) libcrc32c deflate zlib_deflate
ctr twofish_generic twofish_x86_64_3way glue_helper lrw xts gf128mul
twofish_x86_64 twofish_common camellia_generic serpent_generic
blowfish_generic blowfish_x86_64 blowfish_common cast5_generic des_generic
xcbc rmd160 sha512_generic crypto_null af_key xfrm_algo kvm ppdev microcode
psmouse nfsv4 serio_raw nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc
parport_pc mac_hid i2c_piix4 lp parport floppy [last unloaded: btrfs]
[67847.557614] Pid: 10706, comm: umount Tainted: GW O
3.7.0-560-generic #57ba86c00f9573b63b8c06810d4f6915efed2442
[67847.557616] Call Trace:
[67847.557629] [] warn_slowpath_common+0x7f/0xc0
[67847.557635] [] warn_slowpath_null+0x1a/0x20
[67847.557651] [] btrfs_free_block_groups+0x2ce/0x370
[btrfs]
[67847.557669] [] close_ctree+0x1c7/0x310 [btrfs]
[67847.557678] [] ? evict_inodes+0xce/0x130
[67847.557689] [] btrfs_put_super+0x19/0x20 [btrfs]
[67847.557697] [] generic_shutdown_super+0x62/0xf0
[67847.557703] [] kill_anon_super+0x16/0x30
[67847.557714] [] btrfs_kill_super+0x1a/0x90 [btrfs]
[67847.557720] [] deactivate_locked_super+0x3c/0x90
[67847.557725] [] deactivate_super+0x4e/0x70
[67847.557730] [] mn
