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Allow negative argument for mkpartition

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Allow negative argument for mtpartition to support kernels >= 4.6.
Update the mt man page.
This commit is contained in:
Kai Mäkisara
2016-05-01 02:04:05 +02:00
committed by Iustin Pop
parent 6edb9f2cc5
commit 6a00368c21
2 changed files with 11 additions and 3 deletions
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mt.1
+9 -1
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@@ -124,7 +124,10 @@ in the partition given by the argument after count. The default
partition is zero.
.IP mkpartition
(SCSI tapes) Format the tape with one (count is zero) or two partitions
(count gives the size of the second partition in megabytes). The tape
(count gives the size of the second partition in megabytes). If the count is
positive, it specifies the size of partition 1. From kernel version 4.6, if
the count is negative, it specifies the size of partition 0. With older
kernels, a negative argument formats the tape with one partition. The tape
drive must be able to format partitioned tapes with
initiator-specified partition size and partition support
must be enabled for the drive.
@@ -282,6 +285,11 @@ Otherwise, a default device defined in the file
is used (note that the actual path to
.I mtio.h
can vary per architecture and/or distribution).
.SH NOTES
The argument of mkpartition specifies the size of the partition in
megabytes. If you add a postfix, it applies to this definition. For example,
argument 1G means 1 giga megabytes, which probably is not what the user is
anticipating.
.SH AUTHOR
The program is written by Kai Makisara <Kai.Makisara@kolumbus.fi>.
.SH COPYRIGHT
mt.c
+2 -2
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@@ -462,14 +462,14 @@ do_standard(int mtfd, cmdef_tr *cmd, int argc, char **argv)
return 3;
}
max_count = INT_MAX / multiplier;
if (mt_com.mt_count > max_count) {
if (abs(mt_com.mt_count) > max_count) {
fprintf(stderr, "mt: repeat count too large.\n");
return 3;
}
mt_com.mt_count *= multiplier;
}
mt_com.mt_count |= cmd->cmd_count_bits;
if (mt_com.mt_count < 0) {
if (mt_com.mt_op != MTMKPART && mt_com.mt_count < 0) {
fprintf(stderr, "mt: negative repeat count\n");
return 1;
}