[LU-8040] changelog_mask modifications from default do not persist across MDT restart

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.9.0
• Labels: bgti patch
• Severity: 3
• Assignee: Niu Yawei (Inactive)
• Reporter: Artem Blagodarenko (Inactive)

Description

If the changelog_mask is updated from the default, e.g. by running on MGS:
lctl conf_param snx11155-MDT0000.changelog_mask=+CLOSE
The mask change is picked up by the MDS, but on MDS restart (e.g. on failover of MDT), the updated flag is not preserved. The changelog_mask reverts to its original setting.

lctl set_param -P command stores options to params file. This options
are aplied in server_start_targets during target mount. At least
changelog apply default options during initialization. So it reset
options applied by set_param -P.

Params log file processing should be moved after device initialization.
So new parameters aplied after default.

How to recreate:

lctl get_param mdd.*.changelog_mask
testfs.changelog_mask=
MARK CREAT MKDIR HLINK SLINK MKNOD UNLNK RMDIR RENME RNMTO OPEN  LYOUT TRUNC SATTR XATTR HSM MTIME CTIME 
lctl conf_param testfs-MDT0000.mdd.changelog_mask='MARK CREAT MKDIR HLINK SLINK MKNOD UNLNK RMDIR RENME RNMTO OPEN CLOSE LYOUT TRUNC SATTR XATTR HSM MTIME CTIME'
lctl get_param mdd.*.changelog_mask
testfs-MDT0000.changelog_mask=
MARK CREAT MKDIR HLINK SLINK MKNOD UNLNK RMDIR RENME RNMTO OPEN CLOSE LYOUT TRUNC SATTR XATTR HSM MTIME CTIME
#restart mdt
lctl get_param mdd.*.changelog_mask
MARK CREAT MKDIR HLINK SLINK MKNOD UNLNK RMDIR RENME RNMTO OPEN LYOUT TRUNC SATTR XATTR HSM MTIME CTIME