From 30e05599219f3c15bd5f24190af0e33cdb4a00e5 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Mon, 24 Aug 2020 16:01:34 -0700
Subject: [PATCH] xfs: redefine xfs_ictimestamp_t
Git-commit: 30e05599219f3c15bd5f24190af0e33cdb4a00e5
Patch-mainline: v5.10-rc1
References: bsc#1203387

Redefine xfs_ictimestamp_t as a uint64_t typedef in preparation for the
bigtime functionality.  Preserve the legacy structure format so that we
can let the compiler take care of the masking and shifting.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>

---
 fs/xfs/libxfs/xfs_inode_buf.c  |  6 ++++--
 fs/xfs/libxfs/xfs_log_format.h |  7 +++++--
 fs/xfs/xfs_inode_item.c        | 30 ++++++++++++++++++++++--------
 fs/xfs/xfs_ondisk.h            |  3 ++-
 4 files changed, 33 insertions(+), 13 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 89c597ccf2cd..0213d1f41743 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -360,11 +360,13 @@ xfs_log_dinode_to_disk_ts(
 	const xfs_ictimestamp_t		its)
 {
 	struct xfs_legacy_timestamp	*lts;
+	struct xfs_legacy_ictimestamp	*lits;
 	xfs_timestamp_t			ts;
 
 	lts = (struct xfs_legacy_timestamp *)&ts;
-	lts->t_sec = cpu_to_be32(its.t_sec);
-	lts->t_nsec = cpu_to_be32(its.t_nsec);
+	lits = (struct xfs_legacy_ictimestamp *)&its;
+	lts->t_sec = cpu_to_be32(lits->t_sec);
+	lts->t_nsec = cpu_to_be32(lits->t_nsec);
 
 	return ts;
 }
diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
index 53a94834f747..fe9a713b1e18 100644
--- a/fs/xfs/libxfs/xfs_log_format.h
+++ b/fs/xfs/libxfs/xfs_log_format.h
@@ -380,10 +380,13 @@ static inline int xfs_ilog_fdata(int w)
  * directly mirrors the xfs_dinode structure as it must contain all the same
  * information.
  */
-typedef struct xfs_ictimestamp {
+typedef uint64_t xfs_ictimestamp_t;
+
+/* Legacy timestamp encoding format. */
+struct xfs_legacy_ictimestamp {
 	int32_t		t_sec;		/* timestamp seconds */
 	int32_t		t_nsec;		/* timestamp nanoseconds */
-} xfs_ictimestamp_t;
+};
 
 /*
  * Define the format of the inode core that is logged. This structure must be
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index fe19deb2b917..ced6f4dfce2f 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -310,6 +310,24 @@ xfs_inode_item_format_attr_fork(
 	}
 }
 
+/*
+ * Convert an incore timestamp to a log timestamp.  Note that the log format
+ * specifies host endian format!
+ */
+static inline xfs_ictimestamp_t
+xfs_inode_to_log_dinode_ts(
+	const struct timespec64		tv)
+{
+	struct xfs_legacy_ictimestamp	*lits;
+	xfs_ictimestamp_t		its;
+
+	lits = (struct xfs_legacy_ictimestamp *)&its;
+	lits->t_sec = tv.tv_sec;
+	lits->t_nsec = tv.tv_nsec;
+
+	return its;
+}
+
 static void
 xfs_inode_to_log_dinode(
 	struct xfs_inode	*ip,
@@ -330,12 +348,9 @@ xfs_inode_to_log_dinode(
 
 	memset(to->di_pad, 0, sizeof(to->di_pad));
 	memset(to->di_pad3, 0, sizeof(to->di_pad3));
-	to->di_atime.t_sec = inode->i_atime.tv_sec;
-	to->di_atime.t_nsec = inode->i_atime.tv_nsec;
-	to->di_mtime.t_sec = inode->i_mtime.tv_sec;
-	to->di_mtime.t_nsec = inode->i_mtime.tv_nsec;
-	to->di_ctime.t_sec = inode->i_ctime.tv_sec;
-	to->di_ctime.t_nsec = inode->i_ctime.tv_nsec;
+	to->di_atime = xfs_inode_to_log_dinode_ts(inode->i_atime);
+	to->di_mtime = xfs_inode_to_log_dinode_ts(inode->i_mtime);
+	to->di_ctime = xfs_inode_to_log_dinode_ts(inode->i_ctime);
 	to->di_nlink = inode->i_nlink;
 	to->di_gen = inode->i_generation;
 	to->di_mode = inode->i_mode;
@@ -356,8 +371,7 @@ xfs_inode_to_log_dinode(
 
 	if (from->di_version == 3) {
 		to->di_changecount = inode_peek_iversion(inode);
-		to->di_crtime.t_sec = from->di_crtime.tv_sec;
-		to->di_crtime.t_nsec = from->di_crtime.tv_nsec;
+		to->di_crtime = xfs_inode_to_log_dinode_ts(from->di_crtime);
 		to->di_flags2 = from->di_flags2;
 		to->di_cowextsize = from->di_cowextsize;
 		to->di_ino = ip->i_ino;
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 6d726cc42a7c..6934cd75068a 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -133,7 +133,8 @@ xfs_check_ondisk_structs(void)
 	XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64,		16);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode,		176);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log,		28);
-	XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp,		8);
+	XFS_CHECK_STRUCT_SIZE(xfs_ictimestamp_t,		8);
+	XFS_CHECK_STRUCT_SIZE(struct xfs_legacy_ictimestamp,	8);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32,	52);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,	56);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
-- 
2.35.3