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From 94c5482a7e0cbb6fd289745a4b5f49a133a4f5e8 Mon Sep 17 00:00:00 2001
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
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Date: Tue, 10 Nov 2020 15:11:09 -0500
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Subject: [PATCH] xfs: refactor quota expiration timer modification
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Source kernel commit: 11d8a9190275855f79d62093d789e962cc7228fb
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Define explicit limits on the range of quota grace period expiration
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timeouts and refactor the code that modifies the timeouts into helpers
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that clamp the values appropriately. Note that we'll refactor the
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default grace period timer separately.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Christoph Hellwig <hch@lst.de>
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Reviewed-by: Allison Collins <allison.henderson@oracle.com>
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Reviewed-by: Dave Chinner <dchinner@redhat.com>
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Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
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---
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diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
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index 5712aa0..c67bd61 100644
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--- a/libxfs/xfs_format.h
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+++ b/libxfs/xfs_format.h
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@@ -1180,6 +1180,30 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
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#define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */
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#define XFS_DQUOT_VERSION (uint8_t)0x01 /* latest version number */
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+/*
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+ * XFS Quota Timers
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+ * ================
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+ *
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+ * Traditional quota grace period expiration timers are an unsigned 32-bit
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+ * seconds counter; time zero is the Unix epoch, Jan 1 00:00:01 UTC 1970.
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+ * Note that an expiration value of zero means that the quota limit has not
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+ * been reached, and therefore no expiration has been set. Therefore, the
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+ * ondisk min and max defined here can be used directly to constrain the incore
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+ * quota expiration timestamps on a Unix system.
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+ */
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+
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+/*
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+ * Smallest possible ondisk quota expiration value with traditional timestamps.
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+ * This corresponds exactly with the incore expiration Jan 1 00:00:01 UTC 1970.
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+ */
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+#define XFS_DQ_LEGACY_EXPIRY_MIN ((int64_t)1)
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+
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+/*
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+ * Largest possible ondisk quota expiration value with traditional timestamps.
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+ * This corresponds exactly with the incore expiration Feb 7 06:28:15 UTC 2106.
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+ */
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+#define XFS_DQ_LEGACY_EXPIRY_MAX ((int64_t)U32_MAX)
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+
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/*
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* This is the main portion of the on-disk representation of quota
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* information for a user. This is the q_core of the xfs_dquot_t that
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