On 01/27/2017 07:31 AM, Christoph Anton Mitterer wrote:
On Thu, 2017-01-26 at 11:10 +0800, Qu Wenruo wrote:
Would you please try lowmem_tests branch of my repo?
That branch contains a special debug output for the case you
encountered, which should help to debug the case.
pecial debug output for the case you encountered, which
Here the output with your patches (again, not having applied the
unnecessary fs-tests patches):
In the output below I've replaced filenames with "[snip..snap]" and
exchanged some of the xattr values.
In case you should need their original values for testing, just tell me
and I send them to you off-list.
Sorry for the late reply, in Chinese New Year vacation.
btrfs-progs v4.9 WITH patches:
******************************
# btrfs check --mode=lowmem /dev/nbd0 ; echo $?
checking extents
checking free space cache
checking fs roots
ERROR: root 6031 EXTENT_DATA[277 524288] datasum missing, have: 36864, expect: 45056 ret: 0
Thanks a lot for your debug output!
This shows the full reason of the problem! And it can be fixed easily now.
Checking filesystem on /dev/nbd0
UUID: 326d292d-f97b-43ca-b1e8-c722d3474719
=== fs tree leaf dump: slot: 136 ===
leaf 5960902508544 items 191 free space 60 generation 2775 owner 6031
fs uuid 326d292d-f97b-43ca-b1e8-c722d3474719
chunk uuid 5da7e818-7f0b-43c1-b465-fdfaa52da633
<snipped>
item 136 key (277 EXTENT_DATA 524288) itemoff 8443 itemsize 53
generation 2775 type 1 (regular)
extent data disk byte 6805694144512 nr 36864
extent data offset 0 nr 45056 ram 45056
extent compression 1 (zlib)
I just forgot that, we must handle plain extent and compressed extent
separately.
For compressed case, we should not use extent offset and nr_bytes, but
use the full extent.
I'll update the patchset soon to address it.
Thanks again for your detailed output and patience,
Qu
=== csum tree dump ===
leaf 4983028940800 items 22 free space 6853 generation 3093 owner 7
fs uuid 326d292d-f97b-43ca-b1e8-c722d3474719
chunk uuid 5da7e818-7f0b-43c1-b465-fdfaa52da633
item 0 key (EXTENT_CSUM EXTENT_CSUM 6805691457536) itemoff 16279 itemsize 4
extent csum item
item 1 key (EXTENT_CSUM EXTENT_CSUM 6805691461632) itemoff 16275 itemsize 4
extent csum item
item 2 key (EXTENT_CSUM EXTENT_CSUM 6805691465728) itemoff 16263 itemsize 12
extent csum item
item 3 key (EXTENT_CSUM EXTENT_CSUM 6805691478016) itemoff 16231 itemsize 32
extent csum item
item 4 key (EXTENT_CSUM EXTENT_CSUM 6805691510784) itemoff 16223 itemsize 8
extent csum item
item 5 key (EXTENT_CSUM EXTENT_CSUM 6805691518976) itemoff 16199 itemsize 24
extent csum item
item 6 key (EXTENT_CSUM EXTENT_CSUM 6805691543552) itemoff 16183 itemsize 16
extent csum item
item 7 key (EXTENT_CSUM EXTENT_CSUM 6805691559936) itemoff 15159 itemsize 1024
extent csum item
item 8 key (EXTENT_CSUM EXTENT_CSUM 6805692608512) itemoff 15151 itemsize 8
extent csum item
item 9 key (EXTENT_CSUM EXTENT_CSUM 6805692616704) itemoff 15055 itemsize 96
extent csum item
item 10 key (EXTENT_CSUM EXTENT_CSUM 6805692715008) itemoff 14903 itemsize 152
extent csum item
item 11 key (EXTENT_CSUM EXTENT_CSUM 6805693132800) itemoff 14519 itemsize 384
extent csum item
item 12 key (EXTENT_CSUM EXTENT_CSUM 6805693526016) itemoff 14391 itemsize 128
extent csum item
item 13 key (EXTENT_CSUM EXTENT_CSUM 6805693919232) itemoff 14135 itemsize 256
extent csum item
item 14 key (EXTENT_CSUM EXTENT_CSUM 6805694443520) itemoff 12727 itemsize 1408
extent csum item
item 15 key (EXTENT_CSUM EXTENT_CSUM 6805695885312) itemoff 11811 itemsize 916
extent csum item
item 16 key (EXTENT_CSUM EXTENT_CSUM 6805696823296) itemoff 11007 itemsize 804
extent csum item
item 17 key (EXTENT_CSUM EXTENT_CSUM 6805697646592) itemoff 10211 itemsize 796
extent csum item
item 18 key (EXTENT_CSUM EXTENT_CSUM 6805698461696) itemoff 9799 itemsize 412
extent csum item
item 19 key (EXTENT_CSUM EXTENT_CSUM 6805698883584) itemoff 9259 itemsize 540
extent csum item
item 20 key (EXTENT_CSUM EXTENT_CSUM 6805699436544) itemoff 8827 itemsize 432
extent csum item
item 21 key (EXTENT_CSUM EXTENT_CSUM 6805699878912) itemoff 7403 itemsize 1424
extent csum item
ERROR: errors found in fs roots
found 7519512838144 bytes used, error(s) found
total csum bytes: 7330834320
total tree bytes: 10902437888
total fs tree bytes: 2019704832
total extent tree bytes: 1020149760
btree space waste bytes: 925714197
file data blocks allocated: 7509228494848
referenced 7630551511040
1
Cheers,
Chris.
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