multipath-tools kpartx/dasd.c multipath/multip ...

[bmarzins@sourceware.org]

CVSROOT:	/cvs/dm
Module name:	multipath-tools
Branch: 	RHEL4_FC5
Changes by:	bmarzins@sourceware.org	2007-01-04 19:02:30

Modified files:
	kpartx         : dasd.c 
	multipath      : multipath.conf.redhat 

Log message:
	Add Stefan Bader's dasd partition fix, and some clarifications to
	multipath.conf
	
	Note: with the dasd partition fix, it may be necessary to remake the file
	system on the device, because the superblock may no longer be at the same
	location in the partition.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/kpartx/dasd.c.diff?cvsroot=dm&only_with_tag=RHEL4_FC5&r1=1.1.2.1&r2=1.1.2.2
http://sourceware.org/cgi-bin/cvsweb.cgi/multipath-tools/multipath/multipath.conf.redhat.diff?cvsroot=dm&only_with_tag=RHEL4_FC5&r1=1.5&r2=1.5.2.1

--- multipath-tools/kpartx/dasd.c	2006/09/19 21:06:40	1.1.2.1
+++ multipath-tools/kpartx/dasd.c	2007/01/04 19:02:30	1.1.2.2
@@ -40,14 +40,20 @@
 #include "byteorder.h"
 #include "dasd.h"
 
+unsigned long sectors512(unsigned long sectors, int blocksize)
+{
+	return sectors * (blocksize >> 9);
+}
+
 /*
  */
 int 
 read_dasd_pt(int fd, struct slice all, struct slice *sp, int ns)
 {
 	int retval = -1;
-	int blocksize, offset, size;
+	int blocksize;
 	long disksize;
+	unsigned long offset, size;
 	dasd_information_t info;
 	struct hd_geometry geo;
 	char type[5] = {0,};
@@ -172,13 +178,13 @@
 			/* disk is reserved minidisk */
 			blocksize = label[3];
 			offset = label[13];
-			size = (label[7] - 1)*(blocksize >> 9);
+			size   = sectors512(label[7] - 1, blocksize);
 		} else {
-			offset = (info.label_block + 1) * (blocksize >> 9);
-			size = disksize - offset;
+			offset = info.label_block + 1;
+			size   = disksize;
 		}
-		sp[0].start = offset * (blocksize >> 9);
-		sp[0].size = size - offset * (blocksize >> 9);
+		sp[0].start = sectors512(offset, blocksize);
+		sp[0].size  = size - sp[0].start;
 		retval = 1;
 	} else if ((strncmp(type, "VOL1", 4) == 0) &&
 		(!info.FBA_layout) && (!strcmp(info.type, "ECKD"))) {
@@ -214,8 +220,8 @@
 		        offset = cchh2blk(&f1.DS1EXT1.llimit, &geo);
 			size  = cchh2blk(&f1.DS1EXT1.ulimit, &geo) - 
 				offset + geo.sectors;
-			sp[counter].start = offset * (blocksize >> 9);
-			sp[counter].size = size * (blocksize >> 9);
+			sp[counter].start = sectors512(offset, blocksize);
+			sp[counter].size  = sectors512(size, blocksize);
 			counter++;
 			blk++;
 		}
@@ -224,10 +230,8 @@
 		/*
 		 * Old style LNX1 or unlabeled disk
 		 */
-		offset = (info.label_block + 1) * (blocksize >> 9);
-		size = disksize - offset;
-		sp[0].start = offset * (blocksize >> 9);
-		sp[0].size = size - offset * (blocksize >> 9);
+		sp[0].start = sectors512(info.label_block + 1, blocksize);
+		sp[0].size  = disksize - sp[0].start;
 		retval = 1;
 	}
 
--- multipath-tools/multipath/multipath.conf.redhat	2006/04/19 18:58:28	1.5
+++ multipath-tools/multipath/multipath.conf.redhat	2007/01/04 19:02:30	1.5.2.1
@@ -36,7 +36,12 @@
 ##
 ## The wwid line in the following blacklist section is shown as an example
 ## of how to blacklist devices by wwid.  The 3 devnode lines are the
-## compiled in default blacklist.
+## compiled in default blacklist. If you want to blacklist entire types
+## of devices, such as all scsi devices, you should use a devnode line.
+## However, if you want to blacklist specific devices, you should use
+## a wwid line.  Since there is no guarantee that a specific device will
+## not change names on reboot (from /dev/sda to /dev/sdb for example)
+## devnode lines are not recommended for blacklisting specific devices.
 ##
 #devnode_blacklist {
 #       wwid 26353900f02796769