linux-kernel - md: regression: incorrect warn about updating super block failure

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Message-ID: <20260128082430.96788-1-tj.iam.tj@proton.me>
Date: Wed, 28 Jan 2026 08:25:28 +0000
From: Tj <tj.iam.tj@...ton.me>
To: yukuai@...as.com
Cc: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: md: regression: incorrect warn about updating super block failure

Commit 8c9e376b9d1a222 introduces an error message that is incorrectly reported for LVM raid volumes:

$ journalctl --dmesg --priority err
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX
 md_update_sb: can't update sb for read-only array mdX

$ sudo dmsetup table --target raid
SUNNY-Documents: 0 20971520 raid raid1 3 0 region_size 4096 2 254:74 254:75 254:76 254:77
SUNNY-Media: 0 171966464 raid raid1 3 0 region_size 4096 2 254:69 254:70 254:71 254:72
SUNNY-NAS: 0 46874624 raid raid1 3 0 region_size 4096 2 254:15 254:16 254:17 254:18
SUNNY-Projects: 0 23068672 raid raid1 3 0 region_size 4096 2 254:20 254:21 254:22 254:23
SUNNY-SourceCode_wcorig: 0 478150656 raid raid1 3 0 region_size 4096 2 254:26 254:27 254:28 254:29
SUNNY-WINE: 0 16777216 raid raid1 3 0 region_size 4096 2 254:80 254:81 254:82 254:83
SUNNY-etc: 0 106496 raid raid1 3 0 region_size 4096 2 254:57 254:58 254:59 254:60
SUNNY-home_wcorig: 0 301989888 raid raid1 3 0 region_size 4096 2 254:46 254:47 254:48 254:49
SUNNY-l8r: 0 16777216 raid raid1 3 0 region_size 4096 2 254:37 254:38 254:39 254:40
SUNNY-machines_old: 0 34185216 raid raid1 3 0 region_size 4096 2 254:32 254:33 254:34 254:35
SUNNY-opt: 0 41943040 raid raid1 3 0 region_size 4096 2 254:64 254:65 254:66 254:67
SUNNY-rootfs: 0 67108864 raid raid1 3 0 region_size 4096 2 254:3 254:4 254:5 254:6
SUNNY-usr_local: 0 16777216 raid raid1 3 0 region_size 4096 2 254:52 254:53 254:54 254:55
SUNNY-var_wcorig: 0 25165824 raid raid1 3 0 region_size 4096 2 254:9 254:10 254:11 254:12