Hi,
I've noticed that a single device partition was using metadata.single and
system.single instead of metadata.dup and system.dup. All tests to force
conversion to dup failed.
Here is how to reproduce this with an image and some very simple BTRFS commands
(Debian stretch):
$ uname -a
Linux asdasd 4.0.0-1-amd64 #1 SMP Debian 4.0.2-1 (2015-05-11) x86_64 GNU/Linux
$ btrfs --version
btrfs-progs v4.0
$ fallocate -l 8G test.img
$ mkdir mnt
$ mkfs.btrfs test.img
$ mount -o loop test.img mnt
$ touch mnt/asdasd
$ btrfs fi df mnt
Data, single: total=8.00MiB, used=64.00KiB
System, DUP: total=8.00MiB, used=16.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, DUP: total=409.56MiB, used=112.00KiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=16.00MiB, used=0.00B
$ btrfs balance start -v -mconvert=single -sconvert=single -dconvert=single mnt
-f
Dumping filters: flags 0xf, state 0x0, force is on
DATA (flags 0x100): converting, target=281474976710656, soft is off
METADATA (flags 0x100): converting, target=281474976710656, soft is off
SYSTEM (flags 0x100): converting, target=281474976710656, soft is off
Done, had to relocate 5 out of 5 chunks
$ btrfs fi df mnt
Data, single: total=832.00MiB, used=256.00KiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=256.00MiB, used=112.00KiB
GlobalReserve, single: total=16.00MiB, used=0.00B
$ btrfs balance start -v -mconvert=dup -sconvert=dup -dconvert=single mnt -f
Dumping filters: flags 0xf, state 0x0, force is on
DATA (flags 0x100): converting, target=281474976710656, soft is off
METADATA (flags 0x100): converting, target=32, soft is off
SYSTEM (flags 0x100): converting, target=32, soft is off
Done, had to relocate 3 out of 3 chunks
$ btrfs fi df mnt
Data, single: total=832.00MiB, used=320.00KiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=256.00MiB, used=112.00KiB
GlobalReserve, single: total=16.00MiB, used=0.00B
The expected result would be "Metadata, DUP" and "System, DUP" and not
"Metadata, single" and "System, single"
Some more info.
$ btrfs fi show mnt
Label: none uuid: b1a70fc4-7c18-4929-9b73-8f8bb328e7de
Total devices 1 FS bytes used 384.00KiB
devid 1 size 8.00GiB used 1.09GiB path /dev/loop0
btrfs-progs v4.0
$ btrfs fi usage mnt
Overall:
Device size: 8.00GiB
Device allocated: 1.09GiB
Device unallocated: 6.91GiB
Device missing: 0.00B
Used: 384.00KiB
Free (estimated): 7.72GiB (min: 7.72GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 16.00MiB (used: 0.00B)
Data,single: Size:832.00MiB, Used:256.00KiB
/dev/loop0 832.00MiB
Metadata,single: Size:256.00MiB, Used:112.00KiB
/dev/loop0 256.00MiB
System,single: Size:32.00MiB, Used:16.00KiB
/dev/loop0 32.00MiB
Unallocated:
/dev/loop0 6.91GiB
$ btrfs-debug-tree test.img
root tree
leaf 2539634688 items 16 free space 12515 generation 47 owner 1
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (EXTENT_TREE ROOT_ITEM 0) itemoff 15844 itemsize 439
root data bytenr 2539651072 level 0 dirid 0 refs 1 gen 47
uuid 00000000-0000-0000-0000-000000000000
item 1 key (DEV_TREE ROOT_ITEM 0) itemoff 15405 itemsize 439
root data bytenr 2539569152 level 0 dirid 0 refs 1 gen 46
uuid 00000000-0000-0000-0000-000000000000
item 2 key (FS_TREE INODE_REF 6) itemoff 15388 itemsize 17
inode ref index 0 namelen 7 name: default
item 3 key (FS_TREE ROOT_ITEM 0) itemoff 14949 itemsize 439
root data bytenr 2539356160 level 0 dirid 256 refs 1 gen 42
uuid 00000000-0000-0000-0000-000000000000
ctransid 6 otransid 0 stransid 0 rtransid 0
item 4 key (ROOT_TREE_DIR INODE_ITEM 0) itemoff 14789 itemsize 160
inode generation 3 transid 0 size 0 block group 0 mode 40755
links 1 uid 0 gid 0 rdev 0 flags 0x0
item 5 key (ROOT_TREE_DIR INODE_REF 6) itemoff 14777 itemsize 12
inode ref index 0 namelen 2 name: ..
item 6 key (ROOT_TREE_DIR DIR_ITEM 2378154706) itemoff 14740 itemsize 37
location key (FS_TREE ROOT_ITEM -1) type DIR
namelen 7 datalen 0 name: default
item 7 key (CSUM_TREE ROOT_ITEM 0) itemoff 14301 itemsize 439
root data bytenr 2539667456 level 0 dirid 0 refs 1 gen 47
uuid 00000000-0000-0000-0000-000000000000
item 8 key (UUID_TREE ROOT_ITEM 0) itemoff 13862 itemsize 439
root data bytenr 2539208704 level 0 dirid 0 refs 1 gen 41
uuid be2539ee-1c09-e84c-8ec9-bfe054347ccf
item 9 key (259 INODE_ITEM 0) itemoff 13702 itemsize 160
inode generation 47 transid 47 size 196608 block group 0 mode
100600 links 1 uid 0 gid 0 rdev 0 flags 0x1b
item 10 key (259 EXTENT_DATA 0) itemoff 13649 itemsize 53
extent data disk byte 1633615872 nr 196608
extent data offset 0 nr 196608 ram 196608
extent compression 0
item 11 key (260 INODE_ITEM 0) itemoff 13489 itemsize 160
inode generation 47 transid 47 size 65536 block group 0 mode
100600 links 1 uid 0 gid 0 rdev 0 flags 0x1b
item 12 key (260 EXTENT_DATA 0) itemoff 13436 itemsize 53
extent data disk byte 1633222656 nr 65536
extent data offset 0 nr 65536 ram 65536
extent compression 0
item 13 key (FREE_SPACE UNTYPED 1633222656) itemoff 13395 itemsize 41
location key (259 INODE_ITEM 0)
cache generation 47 entries 2 bitmaps 0
item 14 key (FREE_SPACE UNTYPED 2539192320) itemoff 13354 itemsize 41
location key (260 INODE_ITEM 0)
cache generation 47 entries 6 bitmaps 0
item 15 key (DATA_RELOC_TREE ROOT_ITEM 0) itemoff 12915 itemsize 439
root data bytenr 2539552768 level 0 dirid 256 refs 1 gen 46
uuid 00000000-0000-0000-0000-000000000000
chunk tree
leaf 2505637888 items 4 free space 15845 generation 46 owner 3
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 16185 itemsize 98
dev item devid 1 total_bytes 8589934592 bytes used 1174405120
dev uuid fbdcbb0e-9419-4fc8-8779-4b758783b1db
item 1 key (FIRST_CHUNK_TREE CHUNK_ITEM 1633222656) itemoff 16105
itemsize 80
chunk length 872415232 owner 2 type DATA num_stripes 1
stripe 0 devid 1 offset 2071068672
item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2505637888) itemoff 16025
itemsize 80
chunk length 33554432 owner 2 type SYSTEM num_stripes 1
stripe 0 devid 1 offset 1048576
item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 2539192320) itemoff 15945
itemsize 80
chunk length 268435456 owner 2 type METADATA num_stripes 1
stripe 0 devid 1 offset 34603008
extent tree key (EXTENT_TREE ROOT_ITEM 0)
leaf 2539651072 items 13 free space 15516 generation 47 owner 2
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (1633222656 EXTENT_ITEM 65536) itemoff 16230 itemsize 53
extent refs 1 gen 47 flags DATA
extent data backref root 1 objectid 260 offset 0 count 1
item 1 key (1633222656 BLOCK_GROUP_ITEM 872415232) itemoff 16206
itemsize 24
block group used 262144 chunk_objectid 256 flags DATA
item 2 key (1633615872 EXTENT_ITEM 196608) itemoff 16153 itemsize 53
extent refs 1 gen 47 flags DATA
extent data backref root 1 objectid 259 offset 0 count 1
item 3 key (2505637888 METADATA_ITEM 0) itemoff 16120 itemsize 33
extent refs 1 gen 46 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 3
item 4 key (2505637888 BLOCK_GROUP_ITEM 33554432) itemoff 16096
itemsize 24
block group used 16384 chunk_objectid 256 flags SYSTEM
item 5 key (2539192320 BLOCK_GROUP_ITEM 268435456) itemoff 16072
itemsize 24
block group used 114688 chunk_objectid 256 flags METADATA
item 6 key (2539208704 METADATA_ITEM 0) itemoff 16039 itemsize 33
extent refs 1 gen 41 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 9
item 7 key (2539356160 METADATA_ITEM 0) itemoff 16006 itemsize 33
extent refs 1 gen 42 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 5
item 8 key (2539552768 METADATA_ITEM 0) itemoff 15973 itemsize 33
extent refs 1 gen 46 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 18446744073709551607
item 9 key (2539569152 METADATA_ITEM 0) itemoff 15940 itemsize 33
extent refs 1 gen 46 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 4
item 10 key (2539634688 METADATA_ITEM 0) itemoff 15907 itemsize 33
extent refs 1 gen 47 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 1
item 11 key (2539651072 METADATA_ITEM 0) itemoff 15874 itemsize 33
extent refs 1 gen 47 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 2
item 12 key (2539667456 METADATA_ITEM 0) itemoff 15841 itemsize 33
extent refs 1 gen 47 flags TREE_BLOCK
tree block skinny level 0
tree block backref root 7
device tree key (DEV_TREE ROOT_ITEM 0)
leaf 2539569152 items 4 free space 15999 generation 46 owner 4
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (0 DEV_STATS_ITEM 1) itemoff 16243 itemsize 40
device stats
item 1 key (1 DEV_EXTENT 1048576) itemoff 16195 itemsize 48
dev extent chunk_tree 3
chunk objectid 256 chunk offset 2505637888 length 33554432
item 2 key (1 DEV_EXTENT 34603008) itemoff 16147 itemsize 48
dev extent chunk_tree 3
chunk objectid 256 chunk offset 2539192320 length 268435456
item 3 key (1 DEV_EXTENT 2071068672) itemoff 16099 itemsize 48
dev extent chunk_tree 3
chunk objectid 256 chunk offset 1633222656 length 872415232
fs tree key (FS_TREE ROOT_ITEM 0)
leaf 2539356160 items 6 free space 15713 generation 42 owner 5
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160
inode generation 3 transid 6 size 12 block group 0 mode 40755
links 1 uid 0 gid 0 rdev 0 flags 0x0
item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12
inode ref index 0 namelen 2 name: ..
item 2 key (256 DIR_ITEM 1642998658) itemoff 16075 itemsize 36
location key (257 INODE_ITEM 0) type FILE
namelen 6 datalen 0 name: asdasd
item 3 key (256 DIR_INDEX 2) itemoff 16039 itemsize 36
location key (257 INODE_ITEM 0) type FILE
namelen 6 datalen 0 name: asdasd
item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
inode generation 6 transid 6 size 0 block group 0 mode 100644
links 1 uid 0 gid 0 rdev 0 flags 0x0
item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
inode ref index 2 namelen 6 name: asdasd
checksum tree key (CSUM_TREE ROOT_ITEM 0)
leaf 2539667456 items 0 free space 16283 generation 47 owner 7
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
uuid tree key (UUID_TREE ROOT_ITEM 0)
leaf 2539208704 items 0 free space 16283 generation 41 owner 9
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
data reloc tree key (DATA_RELOC_TREE ROOT_ITEM 0)
leaf 2539552768 items 2 free space 16061 generation 46 owner
18446744073709551607
fs uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
chunk uuid c2606900-bfa1-444e-ab4d-3f0b2d31626b
item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160
inode generation 3 transid 0 size 0 block group 0 mode 40755
links 1 uid 0 gid 0 rdev 0 flags 0x0
item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12
inode ref index 0 namelen 2 name: ..
total bytes 8589934592
bytes used 393216
uuid b1a70fc4-7c18-4929-9b73-8f8bb328e7de
btrfs-progs v4.0
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