cluster/cmirror-kernel/src dm-cmirror-client.c ...

[jbrassow at sourceware dot org]

CVSROOT:	/cvs/cluster
Module name:	cluster
Branch: 	RHEL4U4
Changes by:	jbrassow@sourceware.org	2006-07-27 23:10:58

Modified files:
	cmirror-kernel/src: dm-cmirror-client.c dm-cmirror-common.h 
	                    dm-cmirror-server.c 

Log message:
	- further tightening for 199826
	
	We now refuse to read/write the disk log if we are suspended.  We also
	add BUG_ON(<suspended>) to operations that do I/O to the log device.
	
	The reason for the BUG_ON() is that it is better to drop the machine
	than to have it hang the cluster while it attempts to read/write from
	a suspended device.  That being said, it should now be impossible to
	get to those functions which would perform I/O operations during
	suspension.
	
	I have still seen cases where the mirror will stall.  However, I think
	this is due to LVM (clvmd), because it happens when a mirror is created
	while the log device is suspended - which must not happen.  I've only
	seen this when doing simultaneous create/convert/remove from all nodes
	in the cluster.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/cluster/cmirror-kernel/src/dm-cmirror-client.c.diff?cvsroot=cluster&only_with_tag=RHEL4U4&r1=1.1.2.19.2.3&r2=1.1.2.19.2.4
http://sourceware.org/cgi-bin/cvsweb.cgi/cluster/cmirror-kernel/src/dm-cmirror-common.h.diff?cvsroot=cluster&only_with_tag=RHEL4U4&r1=1.1.2.7.2.2&r2=1.1.2.7.2.3
http://sourceware.org/cgi-bin/cvsweb.cgi/cluster/cmirror-kernel/src/dm-cmirror-server.c.diff?cvsroot=cluster&only_with_tag=RHEL4U4&r1=1.1.2.9.2.6&r2=1.1.2.9.2.7