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75 lines
2.5 KiB
75 lines
2.5 KiB
From 18e3b8c234fac67c6c96e9ff34f0ab4598220fa1 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: explicitly define inode timestamp range
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Source kernel commit: 876fdc7c4f366a709ac272ef3336ae7dce58f2af
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Formally define the inode timestamp ranges that existing filesystems
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support, and switch the vfs timetamp ranges to use it.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Amir Goldstein <amir73il@gmail.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: Gao Xiang <hsiangkao@redhat.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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NOTE: we hvae no xfs_compat.h so S32_MAX etc went in xfs_fs.h
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diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
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index 7f7b03a..5712aa0 100644
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--- a/libxfs/xfs_format.h
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+++ b/libxfs/xfs_format.h
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@@ -839,11 +839,33 @@ typedef struct xfs_agfl {
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ASSERT(xfs_daddr_to_agno(mp, d) == \
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xfs_daddr_to_agno(mp, (d) + (len) - 1)))
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+/*
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+ * XFS Timestamps
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+ * ==============
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+ *
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+ * Traditional ondisk inode timestamps consist of signed 32-bit counters for
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+ * seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
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+ * 1970, which means that the timestamp epoch is the same as the Unix epoch.
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+ * Therefore, the ondisk min and max defined here can be used directly to
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+ * constrain the incore timestamps on a Unix system.
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+ */
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typedef struct xfs_timestamp {
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__be32 t_sec; /* timestamp seconds */
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__be32 t_nsec; /* timestamp nanoseconds */
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} xfs_timestamp_t;
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+/*
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+ * Smallest possible ondisk seconds value with traditional timestamps. This
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+ * corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
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+ */
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+#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
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+
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+/*
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+ * Largest possible ondisk seconds value with traditional timestamps. This
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+ * corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
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+ */
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+#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
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+
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/*
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* On-disk inode structure.
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*
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diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h
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index fbc9031..4fa9852 100644
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--- a/libxfs/xfs_fs.h
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+++ b/libxfs/xfs_fs.h
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@@ -694,6 +694,10 @@ struct timespec64 {
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long tv_nsec; /* nanoseconds */
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};
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+#define U32_MAX ((uint32_t)~0U)
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+#define S32_MAX ((int32_t)(U32_MAX >> 1))
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+#define S32_MIN ((int32_t)(-S32_MAX - 1))
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+
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#ifndef HAVE_BBMACROS
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/*
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* Block I/O parameterization. A basic block (BB) is the lowest size of
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