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Bug 1696876

Summary:	stratisd does not properly update the MDV when a filesystem is extended
Product:	Red Hat Enterprise Linux 8	Reporter:	Todd Gill <tgill>
Component:	stratisd	Assignee:	mulhern <amulhern>
Status:	CLOSED ERRATA	QA Contact:	Storage QE <storage-qe>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	---	CC:	amulhern, dkeefe, ingo.thierack, jkrysl, rhandlin
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-05 21:04:23 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Todd Gill 2019-04-05 20:19:01 UTC

Description of problem:

When stratisd extends the thin device, it does not update the MDV.  When the system is rebooted - stratisd reconstructs the DM table with the wrong length.  The problem causes the filesystem to fail mounting.

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. Create a pool with more than 1TB
2. Create a filesystem in the pool - mount it
3. Write more than 1TB to the filesystem
4. Reboot
5. Attempt to mount the filesystem

Actual results:

Filesystem fails to mount - fail to read superblock

Expected results:

Filesystem mounts cleanly

Additional info:

https://github.com/stratis-storage/stratisd/issues/1474

Comment 1 mulhern 2019-04-17 13:21:24 UTC

upstream issue: https://github.com/stratis-storage/stratisd/issues/1474.

Comment 3 Jakub Krysl 2019-07-31 07:33:34 UTC

# rpm -qa stratisd
stratisd-1.0.4-2.el8.x86_64

# lsblk
NAME                                                                                        MAJ:MIN RM   SIZE RO TYPE    MOUNTPOINT
sda                                                                                           8:0    0   9.1T  0 disk
└─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-physical-originsub                     253:0    0   9.1T  0 stratis
  ├─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thinmeta                        253:1    0   9.3G  0 stratis
  │ └─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-thinpool-pool                      253:3    0   9.1T  0 stratis
  │   └─stratis-1-c6ad7e9f3415498899dba1e15feb1ec6-thin-fs-277a28d0ede943daab9bbaf0b7a8761b 253:5    0     2T  0 stratis /root/stratis
  ├─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thindata                        253:2    0   9.1T  0 stratis
  │ └─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-thinpool-pool                      253:3    0   9.1T  0 stratis
  │   └─stratis-1-c6ad7e9f3415498899dba1e15feb1ec6-thin-fs-277a28d0ede943daab9bbaf0b7a8761b 253:5    0     2T  0 stratis /root/stratis
  └─stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-mdv                             253:4    0    16M  0 stratis

# stratis fs
Pool Name  Name  Used      Created            Device            UUID
test       fs    1.05 TiB  Jul 29 2019 14:56  /stratis/test/fs  277a28d0ede943daab9bbaf0b7a8761b

# dmsetup table
stratis-1-c6ad7e9f3415498899dba1e15feb1ec6-thin-fs-277a28d0ede943daab9bbaf0b7a8761b: 0 4294967296 thin 253:3 0
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-thinpool-pool: 0 19513270272 thin-pool 253:1 253:2 2048 8425322 3 skip_block_zeroing no_discard_passdown error_if_no_space
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-physical-originsub: 0 19532865536 linear 8:0 8192
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thindata: 0 1572864 linear 253:0 65536
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thindata: 1572864 19511697408 linear 253:0 21168128
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-mdv: 0 32768 linear 253:0 1638400
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thinmeta: 0 32768 linear 253:0 0
stratis-1-private-c6ad7e9f3415498899dba1e15feb1ec6-flex-thinmeta: 32768 19496960 linear 253:0 1671168


Rebooting the system does not cause any issues on mounting any more.

Comment 6 errata-xmlrpc 2019-11-05 21:04:23 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3414