xfs: preserve default grace interval during quotacheck

stable inclusion
from stable-v5.10.143
commit f1101295c145e9710b1b37e9b0a13ef9af9af0c9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5RTF5


CVE: NA

--------------------------------

commit 5885539f upstream.

When quotacheck runs, it zeroes all the timer fields in every dquot.
Unfortunately, it also does this to the root dquot, which erases any
preconfigured grace intervals and warning limits that the administrator
may have set.  Worse yet, the incore copies of those variables remain
set.  This cache coherence problem manifests itself as the grace
interval mysteriously being reset back to the defaults at the /next/
mount.

Fix it by not resetting the root disk dquot's timer and warning fields.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: tangbin <tangbin_yewu@cmss.chinamobile.c...>