restore: Preserve timestamps to the nanosecond.

The restore utility already knows the full-resolution timestamps, so the
only thing to do is to stop converting the timespecs to timevals and use
futimens() and utimensat().

Differential Revision:	https://reviews.freebsd.org/D2020
Reviewed by:	jhb

2 files changed, 23 insertions, 21 deletions

diff --git a/sbin/restore/dirs.c b/sbin/restore/dirs.c
index b2cd8fd..7b308cd 100644
--- a/sbin/restore/dirs.c
+++ b/sbin/restore/dirs.c
@@ -80,8 +80,8 @@ static struct inotab *inotab[HASHSIZE];
  */
 struct modeinfo {
 	ino_t ino;
-	struct timeval ctimep[2];
-	struct timeval mtimep[2];
+	struct timespec ctimep[2];
+	struct timespec mtimep[2];
 	mode_t mode;
 	uid_t uid;
 	gid_t gid;
@@ -656,8 +656,8 @@ setdirmodes(int flags)
 			else
 				(void) chown(cp, node.uid, node.gid);
 			(void) chmod(cp, node.mode);
-			utimes(cp, node.ctimep);
-			utimes(cp, node.mtimep);
+			utimensat(AT_FDCWD, cp, node.ctimep, 0);
+			utimensat(AT_FDCWD, cp, node.mtimep, 0);
 			(void) chflags(cp, node.flags);
 		}
 		ep->e_flags &= ~NEW;
@@ -746,13 +746,13 @@ allocinotab(struct context *ctxp, long seekpt)
 		return (itp);
 	node.ino = ctxp->ino;
 	node.mtimep[0].tv_sec = ctxp->atime_sec;
-	node.mtimep[0].tv_usec = ctxp->atime_nsec / 1000;
+	node.mtimep[0].tv_nsec = ctxp->atime_nsec;
 	node.mtimep[1].tv_sec = ctxp->mtime_sec;
-	node.mtimep[1].tv_usec = ctxp->mtime_nsec / 1000;
+	node.mtimep[1].tv_nsec = ctxp->mtime_nsec;
 	node.ctimep[0].tv_sec = ctxp->atime_sec;
-	node.ctimep[0].tv_usec = ctxp->atime_nsec / 1000;
+	node.ctimep[0].tv_nsec = ctxp->atime_nsec;
 	node.ctimep[1].tv_sec = ctxp->birthtime_sec;
-	node.ctimep[1].tv_usec = ctxp->birthtime_nsec / 1000;
+	node.ctimep[1].tv_nsec = ctxp->birthtime_nsec;
 	node.extsize = ctxp->extsize;
 	node.mode = ctxp->mode;
 	node.flags = ctxp->file_flags;
diff --git a/sbin/restore/tape.c b/sbin/restore/tape.c
index 225fe32..9c9890f 100644
--- a/sbin/restore/tape.c
+++ b/sbin/restore/tape.c
@@ -569,20 +569,20 @@ extractfile(char *name)
 	gid_t gid;
 	mode_t mode;
 	int extsize;
-	struct timeval mtimep[2], ctimep[2];
+	struct timespec mtimep[2], ctimep[2];
 	struct entry *ep;
 	char *buf;
 
 	curfile.name = name;
 	curfile.action = USING;
 	mtimep[0].tv_sec = curfile.atime_sec;
-	mtimep[0].tv_usec = curfile.atime_nsec / 1000;
+	mtimep[0].tv_nsec = curfile.atime_nsec;
 	mtimep[1].tv_sec = curfile.mtime_sec;
-	mtimep[1].tv_usec = curfile.mtime_nsec / 1000;
+	mtimep[1].tv_nsec = curfile.mtime_nsec;
 	ctimep[0].tv_sec = curfile.atime_sec;
-	ctimep[0].tv_usec = curfile.atime_nsec / 1000;
+	ctimep[0].tv_nsec = curfile.atime_nsec;
 	ctimep[1].tv_sec = curfile.birthtime_sec;
-	ctimep[1].tv_usec = curfile.birthtime_nsec / 1000;
+	ctimep[1].tv_nsec = curfile.birthtime_nsec;
 	extsize = curfile.extsize;
 	uid = getuid();
 	if (uid == 0)
@@ -628,8 +628,10 @@ extractfile(char *name)
 				set_extattr_link(name, buf, extsize);
 			(void) lchown(name, uid, gid);
 			(void) lchmod(name, mode);
-			(void) lutimes(name, ctimep);
-			(void) lutimes(name, mtimep);
+			(void) utimensat(AT_FDCWD, name, ctimep,
+			    AT_SYMLINK_NOFOLLOW);
+			(void) utimensat(AT_FDCWD, name, mtimep,
+			    AT_SYMLINK_NOFOLLOW);
 			(void) lchflags(name, flags);
 			return (GOOD);
 		}
@@ -658,8 +660,8 @@ extractfile(char *name)
 		}
 		(void) chown(name, uid, gid);
 		(void) chmod(name, mode);
-		(void) utimes(name, ctimep);
-		(void) utimes(name, mtimep);
+		(void) utimensat(AT_FDCWD, name, ctimep, 0);
+		(void) utimensat(AT_FDCWD, name, mtimep, 0);
 		(void) chflags(name, flags);
 		return (GOOD);
 
@@ -688,8 +690,8 @@ extractfile(char *name)
 		}
 		(void) chown(name, uid, gid);
 		(void) chmod(name, mode);
-		(void) utimes(name, ctimep);
-		(void) utimes(name, mtimep);
+		(void) utimensat(AT_FDCWD, name, ctimep, 0);
+		(void) utimensat(AT_FDCWD, name, mtimep, 0);
 		(void) chflags(name, flags);
 		return (GOOD);
 
@@ -714,8 +716,8 @@ extractfile(char *name)
 			set_extattr_fd(ofile, name, buf, extsize);
 		(void) fchown(ofile, uid, gid);
 		(void) fchmod(ofile, mode);
-		(void) futimes(ofile, ctimep);
-		(void) futimes(ofile, mtimep);
+		(void) futimens(ofile, ctimep);
+		(void) futimens(ofile, mtimep);
 		(void) fchflags(ofile, flags);
 		(void) close(ofile);
 		return (GOOD);