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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: darrick.wong@oracle.com, david@fromorbit.com, hch@infradead.org
Cc: linux-xfs@vger.kernel.org, amir73il@gmail.com, sandeen@sandeen.net
Subject: [PATCH 06/11] xfs: kill struct xfs_timestamp
Date: Wed, 26 Aug 2020 15:05:36 -0700	[thread overview]
Message-ID: <159847953684.2601708.8165492597542894989.stgit@magnolia> (raw)
In-Reply-To: <159847949739.2601708.16579235017313836378.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

Replace this struct with an encoded __be64 value and add conversion
helpers to deal with the change.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_format.h      |    8 ++---
 fs/xfs/libxfs/xfs_inode_buf.c   |   62 +++++++++++++++++++++++++++++----------
 fs/xfs/libxfs/xfs_inode_buf.h   |    2 +
 fs/xfs/scrub/inode.c            |   25 +++++++++++-----
 fs/xfs/xfs_inode_item_recover.c |   26 +++++++++++-----
 fs/xfs/xfs_ondisk.h             |    2 +
 6 files changed, 87 insertions(+), 38 deletions(-)


diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 4b68a473b090..96734ba9aa5f 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -856,12 +856,10 @@ struct xfs_agfl {
  * seconds and nanoseconds; time zero is the Unix epoch, Jan  1 00:00:00 UTC
  * 1970, which means that the timestamp epoch is the same as the Unix epoch.
  * Therefore, the ondisk min and max defined here can be used directly to
- * constrain the incore timestamps on a Unix system.
+ * constrain the incore timestamps on a Unix system.  Note that we actually
+ * encode a __be64 value on disk.
  */
-typedef struct xfs_timestamp {
-	__be32		t_sec;		/* timestamp seconds */
-	__be32		t_nsec;		/* timestamp nanoseconds */
-} xfs_timestamp_t;
+typedef __be64 xfs_timestamp_t;
 
 /*
  * Smallest possible ondisk seconds value with traditional timestamps.  This
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index fa83591ca89b..1e65e28a9386 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -157,6 +157,26 @@ xfs_imap_to_bp(
 	return 0;
 }
 
+/*
+ * Convert an ondisk timestamp to an incore timestamp.
+ *
+ * For traditional timestamps, the ondisk format specifies that the seconds
+ * are stored in the first four bytes and the nanoseconds in the second four.
+ * Let the be64 conversion rotate the seconds field into the upper 32-bits,
+ * then shift and mask to extract the two values.
+ */
+struct timespec64
+xfs_inode_from_disk_ts(
+	const xfs_timestamp_t	ts)
+{
+	struct timespec64	tv;
+	uint64_t		t = be64_to_cpu(ts);
+
+	tv.tv_sec = (int64_t)t >> 32;
+	tv.tv_nsec = (int32_t)(t & 0xffffffff);
+	return tv;
+}
+
 int
 xfs_inode_from_disk(
 	struct xfs_inode	*ip,
@@ -211,12 +231,9 @@ xfs_inode_from_disk(
 	 * a time before epoch is converted to a time long after epoch
 	 * on 64 bit systems.
 	 */
-	inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
-	inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
-	inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
-	inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
-	inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
-	inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
+	inode->i_atime = xfs_inode_from_disk_ts(from->di_atime);
+	inode->i_mtime = xfs_inode_from_disk_ts(from->di_mtime);
+	inode->i_ctime = xfs_inode_from_disk_ts(from->di_ctime);
 
 	to->di_size = be64_to_cpu(from->di_size);
 	to->di_nblocks = be64_to_cpu(from->di_nblocks);
@@ -229,8 +246,7 @@ xfs_inode_from_disk(
 	if (xfs_sb_version_has_v3inode(&ip->i_mount->m_sb)) {
 		inode_set_iversion_queried(inode,
 					   be64_to_cpu(from->di_changecount));
-		to->di_crtime.tv_sec = be32_to_cpu(from->di_crtime.t_sec);
-		to->di_crtime.tv_nsec = be32_to_cpu(from->di_crtime.t_nsec);
+		to->di_crtime = xfs_inode_from_disk_ts(from->di_crtime);
 		to->di_flags2 = be64_to_cpu(from->di_flags2);
 		to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
 	}
@@ -252,6 +268,24 @@ xfs_inode_from_disk(
 	return error;
 }
 
+/*
+ * Convert an incore timestamp to an ondisk timestamp.
+ *
+ * For traditional timestamps, the ondisk format specifies that the seconds
+ * are stored in the first four bytes and the nanoseconds in the second four.
+ * Shift the seconds into the upper 32-bits so that the be64 conversion will
+ * take care of rotating the bytes for us.
+ */
+static inline xfs_timestamp_t
+xfs_inode_to_disk_ts(
+	const struct timespec64	tv)
+{
+	uint64_t		t;
+
+	t = ((int64_t)tv.tv_sec << 32) | (tv.tv_nsec & 0xffffffff);
+	return cpu_to_be64(t);
+}
+
 void
 xfs_inode_to_disk(
 	struct xfs_inode	*ip,
@@ -271,12 +305,9 @@ xfs_inode_to_disk(
 	to->di_projid_hi = cpu_to_be16(from->di_projid >> 16);
 
 	memset(to->di_pad, 0, sizeof(to->di_pad));
-	to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
-	to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
-	to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
-	to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
-	to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
-	to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
+	to->di_atime = xfs_inode_to_disk_ts(inode->i_atime);
+	to->di_mtime = xfs_inode_to_disk_ts(inode->i_mtime);
+	to->di_ctime = xfs_inode_to_disk_ts(inode->i_ctime);
 	to->di_nlink = cpu_to_be32(inode->i_nlink);
 	to->di_gen = cpu_to_be32(inode->i_generation);
 	to->di_mode = cpu_to_be16(inode->i_mode);
@@ -295,8 +326,7 @@ xfs_inode_to_disk(
 	if (xfs_sb_version_has_v3inode(&ip->i_mount->m_sb)) {
 		to->di_version = 3;
 		to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
-		to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.tv_sec);
-		to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.tv_nsec);
+		to->di_crtime = xfs_inode_to_disk_ts(from->di_crtime);
 		to->di_flags2 = cpu_to_be64(from->di_flags2);
 		to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
 		to->di_ino = cpu_to_be64(ip->i_ino);
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 89f7bea8efd6..3060ecd24a2e 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -58,4 +58,6 @@ xfs_failaddr_t xfs_inode_validate_cowextsize(struct xfs_mount *mp,
 		uint32_t cowextsize, uint16_t mode, uint16_t flags,
 		uint64_t flags2);
 
+struct timespec64 xfs_inode_from_disk_ts(const xfs_timestamp_t ts);
+
 #endif	/* __XFS_INODE_BUF_H__ */
diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
index 6d483ab29e63..eb1cc013d4ca 100644
--- a/fs/xfs/scrub/inode.c
+++ b/fs/xfs/scrub/inode.c
@@ -195,6 +195,19 @@ xchk_inode_flags2(
 	xchk_ino_set_corrupt(sc, ino);
 }
 
+static inline void
+xchk_dinode_nsec(
+	struct xfs_scrub	*sc,
+	xfs_ino_t		ino,
+	const xfs_timestamp_t	ts)
+{
+	struct timespec64	tv;
+
+	tv = xfs_inode_from_disk_ts(ts);
+	if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
+		xchk_ino_set_corrupt(sc, ino);
+}
+
 /* Scrub all the ondisk inode fields. */
 STATIC void
 xchk_dinode(
@@ -293,12 +306,9 @@ xchk_dinode(
 	}
 
 	/* di_[amc]time.nsec */
-	if (be32_to_cpu(dip->di_atime.t_nsec) >= NSEC_PER_SEC)
-		xchk_ino_set_corrupt(sc, ino);
-	if (be32_to_cpu(dip->di_mtime.t_nsec) >= NSEC_PER_SEC)
-		xchk_ino_set_corrupt(sc, ino);
-	if (be32_to_cpu(dip->di_ctime.t_nsec) >= NSEC_PER_SEC)
-		xchk_ino_set_corrupt(sc, ino);
+	xchk_dinode_nsec(sc, ino, dip->di_atime);
+	xchk_dinode_nsec(sc, ino, dip->di_mtime);
+	xchk_dinode_nsec(sc, ino, dip->di_ctime);
 
 	/*
 	 * di_size.  xfs_dinode_verify checks for things that screw up
@@ -403,8 +413,7 @@ xchk_dinode(
 	}
 
 	if (dip->di_version >= 3) {
-		if (be32_to_cpu(dip->di_crtime.t_nsec) >= NSEC_PER_SEC)
-			xchk_ino_set_corrupt(sc, ino);
+		xchk_dinode_nsec(sc, ino, dip->di_crtime);
 		xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
 		xchk_inode_cowextsize(sc, dip, ino, mode, flags,
 				flags2);
diff --git a/fs/xfs/xfs_inode_item_recover.c b/fs/xfs/xfs_inode_item_recover.c
index 1e417ace2912..e7c6f2b95e17 100644
--- a/fs/xfs/xfs_inode_item_recover.c
+++ b/fs/xfs/xfs_inode_item_recover.c
@@ -115,6 +115,20 @@ xfs_recover_inode_owner_change(
 	return error;
 }
 
+/*
+ * Convert a log timestamp to an ondisk timestamp.  See notes about the ondisk
+ * encoding in the comments for xfs_inode_to_disk_ts.
+ */
+static inline xfs_timestamp_t
+xfs_log_dinode_to_disk_ts(
+	const xfs_ictimestamp_t	its)
+{
+	uint64_t		t;
+
+	t = ((int64_t)its.t_sec << 32) | (its.t_nsec & 0xffffffff);
+	return cpu_to_be64(t);
+}
+
 STATIC void
 xfs_log_dinode_to_disk(
 	struct xfs_log_dinode	*from,
@@ -132,12 +146,9 @@ xfs_log_dinode_to_disk(
 	to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
 	memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
 
-	to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
-	to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
-	to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
-	to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
-	to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
-	to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
+	to->di_atime = xfs_log_dinode_to_disk_ts(from->di_atime);
+	to->di_mtime = xfs_log_dinode_to_disk_ts(from->di_mtime);
+	to->di_ctime = xfs_log_dinode_to_disk_ts(from->di_ctime);
 
 	to->di_size = cpu_to_be64(from->di_size);
 	to->di_nblocks = cpu_to_be64(from->di_nblocks);
@@ -153,8 +164,7 @@ xfs_log_dinode_to_disk(
 
 	if (from->di_version == 3) {
 		to->di_changecount = cpu_to_be64(from->di_changecount);
-		to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
-		to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
+		to->di_crtime = xfs_log_dinode_to_disk_ts(from->di_crtime);
 		to->di_flags2 = cpu_to_be64(from->di_flags2);
 		to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
 		to->di_ino = cpu_to_be64(from->di_ino);
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index acb9b737fe6b..2f11a6f9e005 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -41,7 +41,7 @@ xfs_check_ondisk_structs(void)
 	XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec,		12);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key,		20);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec,		24);
-	XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp,		8);
+	XFS_CHECK_STRUCT_SIZE(xfs_timestamp_t,			8);
 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t,			8);
 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t,			4);
 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t,			8);


  parent reply	other threads:[~2020-08-26 22:05 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-26 22:04 [PATCH v4 00/11] xfs: widen timestamps to deal with y2038 Darrick J. Wong
2020-08-26 22:05 ` [PATCH 01/11] xfs: explicitly define inode timestamp range Darrick J. Wong
2020-08-27  6:42   ` Christoph Hellwig
2020-08-28  4:08   ` Allison Collins
2020-08-26 22:05 ` [PATCH 02/11] xfs: refactor quota expiration timer modification Darrick J. Wong
2020-08-27  6:43   ` Christoph Hellwig
2020-08-28  4:08   ` Allison Collins
2020-08-26 22:05 ` [PATCH 03/11] xfs: refactor default quota grace period setting code Darrick J. Wong
2020-08-27  6:44   ` Christoph Hellwig
2020-08-28  4:08   ` Allison Collins
2020-08-26 22:05 ` [PATCH 04/11] xfs: refactor quota timestamp coding Darrick J. Wong
2020-08-27  6:44   ` Christoph Hellwig
2020-08-28  4:08   ` Allison Collins
2020-08-26 22:05 ` [PATCH 05/11] xfs: move xfs_log_dinode_to_disk to the log recovery code Darrick J. Wong
2020-08-27  6:45   ` Christoph Hellwig
2020-08-28  4:08   ` Allison Collins
2020-08-26 22:05 ` Darrick J. Wong [this message]
2020-08-28  4:08   ` [PATCH 06/11] xfs: kill struct xfs_timestamp Allison Collins
2020-08-26 22:05 ` [PATCH 07/11] xfs: kill struct xfs_ictimestamp Darrick J. Wong
2020-08-27  6:51   ` Christoph Hellwig
2020-08-27  8:17     ` Amir Goldstein
2020-08-27  8:18       ` Christoph Hellwig
2020-08-27  8:56         ` Amir Goldstein
2020-08-27 15:31     ` Darrick J. Wong
2020-08-26 22:05 ` [PATCH 08/11] xfs: widen ondisk inode timestamps to deal with y2038+ Darrick J. Wong
2020-08-27  6:58   ` Christoph Hellwig
2020-08-27 15:38     ` Darrick J. Wong
2020-08-26 22:05 ` [PATCH 09/11] xfs: widen ondisk quota expiration timestamps to handle y2038+ Darrick J. Wong
2020-08-27  7:00   ` Christoph Hellwig
2020-08-27 17:49     ` Darrick J. Wong
2020-08-28  6:08   ` Allison Collins
2020-08-26 22:06 ` [PATCH 10/11] xfs: trace timestamp limits Darrick J. Wong
2020-08-27  7:01   ` Christoph Hellwig
2020-08-28  6:08   ` Allison Collins
2020-08-26 22:06 ` [PATCH 11/11] xfs: enable big timestamps Darrick J. Wong
2020-08-28  6:09   ` Allison Collins
2020-08-27  6:41 ` [PATCH v4 00/11] xfs: widen timestamps to deal with y2038 Christoph Hellwig

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