Swing the axe and remove some archaic features from newfs which modern

diskdrives do neither need nor want:

	-O create a 4.3BSD format filesystem
	-d rotational delay between contiguous blocks
	-k sector 0 skew, per track
	-l hardware sector interleave
	-n number of distinguished rotational positions
	-p spare sectors per track
	-r revolutions/minute
	-t tracks/cylinder
	-x spare sectors per cylinder

No change in the produced filesystem image unless one or more of
these options were used.

Approved by:	mckusick

1 files changed, 3 insertions, 82 deletions

diff --git a/sbin/newfs/newfs.8 b/sbin/newfs/newfs.8
index aefc95d..dfcb9a1 100644
--- a/sbin/newfs/newfs.8
+++ b/sbin/newfs/newfs.8
@@ -46,24 +46,16 @@
 .Op Fl a Ar maxcontig
 .Op Fl b Ar block-size
 .Op Fl c Ar cylinders
-.Op Fl d Ar rotdelay
 .Op Fl e Ar maxbpg
 .Op Fl f Ar frag-size
 .Op Fl g Ar avgfilesize
 .Op Fl h Ar avfpdir
 .Op Fl i Ar bytes
-.Op Fl k Ar skew
-.Op Fl l Ar interleave
 .Op Fl m Ar free space
-.Op Fl n Ar rotational positions
 .Op Fl o Ar optimization
-.Op Fl p Ar sectors
-.Op Fl r Ar revolutions
 .Op Fl s Ar size
-.Op Fl t Ar tracks
 .Op Fl u Ar sectors
 .Op Fl v
-.Op Fl x Ar sectors
 .Ar special
 .Sh DESCRIPTION
 .Nm Newfs
@@ -91,19 +83,11 @@ For backward compatibility.
 .It Fl N
 Cause the file system parameters to be printed out
 without really creating the file system.
-.It Fl O
-Create a
-.Bx 4.3
-format filesystem.
-This options is primarily used to build root filesystems
-that can be understood by older boot ROMs.
 .It Fl U
 Enables soft updates on the new filesystem.
 .It Fl a Ar maxcontig
 Specify the maximum number of contiguous blocks that will be
-laid out before forcing a rotational delay (see the
-.Fl d
-option).
+laid out before forcing a rotational delay.
 The default value is 1.
 See
 .Xr tunefs 8
@@ -119,14 +103,6 @@ The number of cylinders per cylinder group in a file system.  The default
 is to compute the maximum allowed by the other parameters.  This value is
 dependent on a number of other parameters, in particular the block size
 and the number of bytes per inode.
-.It Fl d Ar rotdelay
-This parameter once specified the minimum time in milliseconds required to
-initiate another disk transfer on the same cylinder.  It was used in determining
-the rotationally optimal layout for disk blocks within a file.  Modern disks
-with read/write-behind achieve higher performance with this feature disabled, so
-this value should be left at the default value of 0 milliseconds.  See
-.Xr tunefs 8
-for more details on how to set this option.
 .It Fl e Ar maxbpg
 Indicate the maximum number of blocks any single file can
 allocate out of a cylinder group before it is forced to begin
@@ -167,15 +143,6 @@ currently 8%.
 See
 .Xr tunefs 8
 for more details on how to set this option.
-.It Fl n Ar number of distinguished rotational positions
-UFS has the ability to keep track of the availability of blocks at different
-rotational positions, so that it could lay out the data to be picked up with
-minimum rotational latency.  This parameter specifies the default number of
-rotational positions to distinguish.
-.Pp
-Nowadays this value should be set to 1 (which essentially disables the
-rotational position table) because modern drives with read-ahead and
-write-behind do better without the rotational position table.
 .It Fl o Ar optimization\ preference
 .Pq Ar space No or Ar time .
 The file system can either be instructed to try to minimize the time spent
@@ -218,57 +185,11 @@ to find the alternate superblocks if the standard superblock is lost.
 .Bl -tag -width indent
 .It Fl S Ar sector-size
 The size of a sector in bytes (almost never anything but 512).
-.It Fl k Ar sector \&0 skew , per track
-Used to describe perturbations in the media format to compensate for
-a slow controller.
-Track skew is the offset of sector 0 on track N relative to sector 0
-on track N-1 on the same cylinder.
-This option is of historical importance only; modern controllers are always fast
-enough to handle operations back-to-back.
-.It Fl l Ar hardware sector interleave
-Used to describe perturbations in the media format to compensate for
-a slow controller.
-Interleave is physical sector interleave on each track,
-specified as the denominator of the ratio:
-.Dl sectors read/sectors passed over
-Thus an interleave of 1/1 implies contiguous layout, while 1/2 implies
-logical sector 0 is separated by one sector from logical sector 1.
-This option is of historical importance only; the physical sector layout of
-modern disks is not visible from outside.
-.It Fl p Ar spare sectors per track
-Spare sectors (bad sector replacements) are physical sectors that occupy
-space at the end of each track.
-They are not counted as part of the sectors/track
-.Pq Fl u
-since they are not available to the file system for data allocation.
-This option is of historical importance only.  Modern disks perform their own
-bad sector allocation.
-.It Fl r Ar revolutions/minute
-The speed of the disk in revolutions per minute.  This value is no longer of
-interest, since all the parameters which depend on it are usually disabled.
-.It Fl t Ar #tracks/cylinder
-The number of tracks/cylinder available for data allocation by the file
-system.
-The default is 1.
-If zero is specified, the value from the disklabel will be used.
-.It Fl u Ar sectors/track
-The number of sectors per track available for data allocation by the file
+.It Fl u Ar sectors/cylinders
+The number of sectors per cylinder available for data allocation by the file
 system.
 The default is 4096.
 If zero is specified, the value from the disklabel will be used.
-This does not include sectors reserved at the end of each track for bad
-block replacement (see the
-.Fl p
-option).
-.It Fl x Ar spare sectors per cylinder
-Spare sectors (bad sector replacements) are physical sectors that occupy
-space at the end of the last track in the cylinder.
-They are deducted from the sectors/track
-.Pq Fl u
-of the last track of each cylinder since they are not available to the file
-system for data allocation.
-This option is of historical importance only.  Modern disks perform their own
-bad sector allocation.
 .El
 .Sh EXAMPLES
 .Dl newfs /dev/ad3s1a