From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Formally define the inode timestamp ranges that existing filesystems
support, and switch the vfs timetamp ranges to use it.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
libxfs/libxfs_api_defs.h | 4 ++++
libxfs/xfs_format.h | 19 +++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 99bc5b936da7..4ee02473df0d 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -14,6 +14,10 @@ struct timespec64 {
long tv_nsec; /* nanoseconds */
};
+#define U32_MAX ((uint32_t)~0U)
+#define S32_MAX ((int32_t)(U32_MAX >> 1))
+#define S32_MIN ((int32_t)(-S32_MAX - 1))
+
/*
* This file defines all the kernel based functions we expose to userspace
* via the libxfs_* namespace. This is kept in a separate header file so
diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 88cbcb7950c3..f2a851e49ec3 100644
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -849,11 +849,30 @@ struct xfs_agfl {
ASSERT(xfs_daddr_to_agno(mp, d) == \
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
+/*
+ * XFS Timestamps
+ * ==============
+ *
+ * Inode timestamps consist of signed 32-bit counters for seconds and
+ * nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC 1970.
+ */
typedef struct xfs_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
+/*
+ * Smallest possible timestamp with traditional timestamps, which is
+ * Dec 13 20:45:52 UTC 1901.
+ */
+#define XFS_INO_TIME_MIN ((int64_t)S32_MIN)
+
+/*
+ * Largest possible timestamp with traditional timestamps, which is
+ * Jan 19 03:14:07 UTC 2038.
+ */
+#define XFS_INO_TIME_MAX ((int64_t)S32_MAX)
+
/*
* On-disk inode structure.
*
