Bug 1020825 - Thin_check doesn't return error exit code for broken metadata
Thin_check doesn't return error exit code for broken metadata
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: device-mapper-persistent-data (Show other bugs)
Unspecified Unspecified
high Severity medium
: rc
: 7.0
Assigned To: Heinz Mauelshagen
Depends On: 1019217
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Reported: 2013-10-18 06:52 EDT by Heinz Mauelshagen
Modified: 2014-06-18 01:09 EDT (History)
11 users (show)

See Also:
Fixed In Version: 0.2.8-1.el7
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 1019217
Last Closed: 2014-06-13 09:12:25 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Comment 6 yanfu,wang 2013-12-05 01:07:33 EST
Verified on device-mapper-persistent-data-0.2.8-2.el7:
# modprobe scsi_debug dev_size_mb=256 lbpu=1 lbpws10=1
# pvcreate /dev/sdn
# vgcreate vg /dev/sdn
# lvcreate -T -L20 -V10 -n LV1 vg/pool
# lvcreate -T -V10 -n LV2 vg/pool
# mkfs.ext2 /dev/vg/LV1
# mkfs.ext2 /dev/vg/LV2
# lvs -a vg
  LV              VG              Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert
  LV1             vg              Vwi-a-tz--  12.00m pool          5.21                          
  LV2             vg              Vwi-a-tz--  12.00m pool          5.21                          
  [lvol0_pmspare] vg              ewi-------   4.00m                                             
  pool            vg              twi-a-tz--  20.00m               6.25                          
  [pool_tdata]    vg              Twi-ao----  20.00m                                             
  [pool_tmeta]    vg              ewi-ao----   4.00m                                             

# lvchange -an vg/LV1
# lvchange -an vg/LV2
# lvchange -an vg/pool
# lvs -a vg

swap and dump metadata:
# lvcreate -n meta -L 8M vg
# lvconvert --poolmetadata vg/meta  --thinpool vg/pool
# lvchange -ay vg/meta
# thin_dump /dev/vg/meta >meta
# cat meta 
<superblock uuid="" time="0" transaction="2" data_block_size="128" nr_data_blocks="320">
  <device dev_id="1" mapped_blocks="10" transaction="0" creation_time="0" snap_time="0">
    <range_mapping origin_begin="0" data_begin="0" length="5" time="0"/>
    <range_mapping origin_begin="128" data_begin="5" length="4" time="0"/>
    <single_mapping origin_block="191" data_block="9" time="0"/>
  <device dev_id="2" mapped_blocks="10" transaction="1" creation_time="0" snap_time="0">
    <range_mapping origin_begin="0" data_begin="10" length="5" time="0"/>
    <range_mapping origin_begin="128" data_begin="15" length="4" time="0"/>
    <single_mapping origin_block="191" data_block="19" time="0"/>

Single byte corruption in metadata:
# dd if=/dev/zero of=/dev/vg/meta bs=1 seek=40960 count=1
# thin_check /dev/vg/meta 
examining superblock
examining devices tree
examining mapping tree
  missing all mappings for devices: [3, -]
    bad checksum in btree node
  thin device 2 is missing mappings [3, 0]
[root@sun-x2270m2-01 ~]# echo $?
note: fixed version gives the correct 'failing' exit code now. 

# thin_dump /dev/vg/meta >meta2
metadata contains errors (run thin_check for details).
perhaps you wanted to run with --repair

repair metedata now:
# lvcreate -n fix -L 8M vg
# thin_repair -i /dev/vg/meta -o /dev/vg/fix
# echo $?
# thin_check /dev/vg/fix 
examining superblock
examining devices tree
examining mapping tree
Comment 7 Ludek Smid 2014-06-13 09:12:25 EDT
This request was resolved in Red Hat Enterprise Linux 7.0.

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