96 lines
4.3 KiB
Plaintext
96 lines
4.3 KiB
Plaintext
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sunlabel.c is the source. It should build Just Fine on any NetBSD
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machine; with -DDISTRIB, probably on many non-NetBSD machines - though
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it may require a little tweaking on some. It should work on both
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big-endian and little-endian machines; though I have not personally
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tried it on anything but SPARC and sun3, I have heard one report that
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it worked on NetBSD/i386, which is little-endian.
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Usage: pass a single argument, which is the disk device or file you
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wish to read/write the label to/from. sunlabel reads/writes only the
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first 512 bytes of its argument. There are also some flags supported:
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-disk
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takes an argument specifying the disk device (in case
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you want to give something beginning with a -)
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-fixmagic
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says to ignore an incorrect magic number in the disk
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label
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-fixsum
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says to ignore checksum errors when reading the label
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-new
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says to synthesize a new label rather than reading
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what's there
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-q
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quiet mode - don't print unnecessary babble (currently
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this suppresses the "sunlabel>" prompt).
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Note that -fixmagic is dangerous, especially when combined with
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-fixsum, since it will then happily believe whatever garbage it may
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find in the label. If you use these, you should check all values
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carefully, both the values printed by L and the partition table printed
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by P.
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sunlabel prints a prompt "sunlabel>" and expects commands. You can
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type ? for help; as of this writing, the help is
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? - print this help
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L - print label, except for partition table
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P - print partition table
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[abcdefghijklmnop] <cylno> <size> - change partition
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V <name> <value> - change a non-partition label value
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W - write (possibly modified) label out
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S - set label in the kernel (orthogonal to W)
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Q - quit program (error if no write since last change)
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Q! - quit program (unconditionally) [EOF also quits]
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(If built without special precautions, the S line is present only when
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built on NetBSD.)
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The a through p commands will accept, for the <size> parameter, the
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nnn/nnn/nnn syntax used by SunOS 4.x format(8). (For those not
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familiar with this syntax, a/b/c means a cylinders + b tracks + c
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sectors. For example, if the disk has 16 tracks of 32 sectors, 3/4/5
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means (3*16*32)+(4*32)+5=1669. This calculation always uses the nsect
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and ntrack values as printed by the L command; in particular, if they
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are zero (which they will initially be if -new is used), this syntax is
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not very useful. Some additional strings are accepted. For the
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<cylno> parameter, "end-X" (where X is a partition letter) indicates
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that the partition should start with the first free cylinder after
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partition X; "start-X" indicates that the partition should start at the
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same place as partition X. For the <size> parameter, "end-X" indicates
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that the partition should end at the same place as partition X (even if
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partition X ends partway through a cylinder); "start-X" indicates that
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the partition should end with the last cylinder before partition X; and
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"size-X" means that the partition's size should exactly match partition
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X's size.
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Note that sunlabel supports 16 partitions. SunOS supports only 8.
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Labels written by sunlabel, when partitions i through p are all set
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offset=0 size=0, are identical to Sun labels. If any of the "extended"
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partitions are nontrivial, information about them is tucked into some
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otherwise unused (as far as I can tell) space in the Sun label format.
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I don't know whether SunOS cares what's in that space; as far as I know
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only NetBSD actually uses the extended information, and even that only
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with my patches to do so.
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The V command changes fields printed by the L command. For example, if
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the L command prints
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ascii: ST15230N cyl 5657 alt 2 hd 19 sec 78
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rpm: 0 pcyl: 0 apc: 0 obs1: 0
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obs2: 0 intrlv: 1 ncyl: 5657 acyl: 0
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nhead: 19 nsect: 78 obs3: 0 obs4: 0
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then you could type "V ncyl 6204" to set the ncyl value to 6204, or
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"V ascii Seagate ST15230N cyl 5657 hd 19 sec varying" to set the
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ascii-label string to that string. sunlabel performs very few
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consistency checks on the values you supply, and the ones it does
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perform never generate errors, only warnings; it's a YAFIYGI program.
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I will be glad to correspond with anyone about this program. I'm...
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der Mouse
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mouse@rodents.montreal.qc.ca
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7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
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