Messages in this thread Patch in this message | | | Date | Wed, 29 Sep 1999 08:49:50 -0500 | From | "Louis J. LaBash" <> | Subject | RFC: mtx problem & fix. |
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The media tape changer "mtx" fails after loading a write-protected cartridge when using Linux 2.2.7 /libc6 (see below). I've used mtx for a couple of years with kernel 2.0.x /libc5 without problems.
Note: Cartridge in slot-2 is write-protected.
lou1:/usr/src/mtx-1.1 # uname -a Linux lou1 2.2.7 #12 Wed Sep 22 14:32:23 CDT 1999 i586 unknown
lou1:~ # ldd `which mtx` libc.so.6 => /lib/libc.so.6 (0x40007000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x2aaaa000) lou1:/usr/src/mtx-1.1 #echo $TAPE /dev/nst0 lou1:/usr/src/mtx-1.1 # ls -l /dev/nst0 crw-rw---- 1 root disk 9, 128 Apr 15 00:14 /dev/nst0
lou1:/usr/src/mtx-1.1 # mtx status Data Transfer Element: Empty Storage Element 1: Full Storage Element 2: Full Storage Element 3: Full Storage Element 4: Full lou1:/usr/src/mtx-1.1 # mtx load 1 Loading Storage Element 1 into Data Transfer Element...done lou1:/usr/src/mtx-1.1 # mtx unload 1 Unloading Data Transfer Element into Storage Element 1...done lou1:/usr/src/mtx-1.1 # mtx load 2 Loading Storage Element 2 into Data Transfer Element...done lou1:/usr/src/mtx-1.1 # mtx unload 2 mtx: cannot open SCSI device '/dev/nst0' - Read-only file system lou1:/usr/src/mtx-1.1 # mtx status mtx: cannot open SCSI device '/dev/nst0' - Read-only file system
Error-message was from trying to open tape-device as read/write.
After making the following change:
------------------- cut here mtx-1.1a.dif ----------------------- --- mtx.c-orig Tue May 12 23:59:01 1998 +++ mtx.c Mon Sep 27 12:34:21 1999 @@ -355,7 +355,7 @@ static int SCSI_OpenDevice(char *DeviceName) { - int DeviceFD = open(DeviceName, O_RDWR); + int DeviceFD = open(DeviceName, O_RDONLY); if (DeviceFD < 0) FatalError("cannot open SCSI device '%s' - %m\n", DeviceName); return DeviceFD; ------------------- cut here mtx-1.1a.dif ----------------------- mtx seems to function properly on my old as well as new system.
Does anyone see problems with my change.
Thanks. -- Louis-ljl-{labash@lou1.ll.siue.edu} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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