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[PATCH] xfs: avoid false quotacheck after unclean shutdown

To: cbay@xxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Subject: [PATCH] xfs: avoid false quotacheck after unclean shutdown
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 22 Jul 2014 12:10:14 -0500
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <53CE6415.8080607@xxxxxxxxxxxxx>
References: <53CE6415.8080607@xxxxxxxxxxxxx>
The commit

83e782e xfs: Remove incore use of XFS_OQUOTA_ENFD and XFS_OQUOTA_CHKD

added a new function xfs_sb_quota_from_disk() which swaps
on-disk XFS_OQUOTA_* flags for in-core XFS_GQUOTA_* and XFS_PQUOTA_*
flags after the superblock is read.

However, if log recovery is required, the superblock is read again,
and the modified in-core flags are re-read from disk, so we have
XFS_OQUOTA_* flags in memory again.  This causes the 
XFS_QM_NEED_QUOTACHECK() test to be true, because the XFS_OQUOTA_CHKD
is still set, and not XFS_GQUOTA_CHKD or XFS_PQUOTA_CHKD.

The simple one-line fix is to call xfs_sb_quota_from_disk after
we re-read the superblock during log recovery.

Reported-by: Cyril B. <cbay@xxxxxxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>

Quick-tested only; it seems to resolve Cyril's testcase, but I've
not done an xfstests run yet as this is somewhat of an RFC:

It feels like there may be a better/more systemic fix here, though.
We can't call xfs_sb_quota_from_disk it from xfs_sb_from_disk(),
because the sb read verifier wants to know what was really on disk,
not what was fixed up after the fact.

We could add an "xlate_quota" arg to xfs_sb_from_disk(), but
that feels a little odd; the function today quite clearly only
does endian conversions, not other more detailed translations.

But if something like that is preferred, I can send a patch V2.

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index bce53ac..0a29de7 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -4429,6 +4429,7 @@ xlog_do_recover(
        /* Convert superblock from on-disk format */
        sbp = &log->l_mp->m_sb;
        xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp));
+       xfs_sb_quota_from_disk(sbp);
        ASSERT(sbp->sb_magicnum == XFS_SB_MAGIC);

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