New branch 'review' available with the following commits: commit 1b772c431669971119f8fb7eb5e906fe8b0ece48 Author: David Teigland teigland@redhat.com Date: Thu Jun 19 10:51:54 2014 -0500

sanlock: fix get_hosts off by one

When a host_id is specified, the information for host_id+1 is returned.

Signed-off-by: David Teigland teigland@redhat.com

commit 153a0e2a0ba377f471455aad803f648556f8f06e Author: David Teigland teigland@redhat.com Date: Thu Jun 5 15:38:30 2014 -0500

sanlock: set an event for all hosts in the bitmap

Signed-off-by: David Teigland teigland@redhat.com

commit 32f22cf728955bf4101752b515f712615a79e267 Author: David Teigland teigland@redhat.com Date: Fri May 30 15:06:00 2014 -0500

reset: daemon and program for resetting hosts

The sanlk_resetd daemon gets events from specified lockspaces. Events are defined to cause the sanlk_resetd to: - use wdmd/watchdog to reset the host (event 1) - use /proc/sysrq-trigger to reboot the host (event 4)

The sanlk_resetd daemon can be used alone, and events passed to it from another host by: sanlock client set_event -s lockspace_name -i host_id -e 1

The sanlk_reset program can also be used to communicate with sanlk_resetd on another host. It will set the event(s), then monitor the host status until the target host is dead.

Signed-off-by: David Teigland teigland@redhat.com

commit 77c93f9ee653be0d6b9d2097ca34a4ecd2993911 Author: David Teigland teigland@redhat.com Date: Tue May 27 15:16:00 2014 -0500

sanlock: lockspace host events

Hosts can set/get events between each other using a common lockspace. . set_event takes two opaque 64 bit values ("event" and "data"), and a target host_id with optional host generation. . reg_event creates an fd that a program can use in poll(2), and . get_event on this fd returns the event values that have been set along with the source host_id/generation. . end_event releases the registered fd.

Each set_event call replaces generation/event/data values from the previous set_event call, but host_id's from each are maintained.

set_event can be used to send the same event/data values to multiple hosts at once using multiple set_event calls (generation is not applicable in this case.)

set_event with different values within the same window of time can result in the earlier target host(s) seeing later values not intended for them, and missing the earlier values.

Event values are passed through fields in the lockspace delta leases. Event notification is done via the host_id bitmaps in lockspace delta leases. Setting an event (or making a resource request) for a target host results in the target host's bit being set in the sending host's bitmap. The bit remains set for set_bitmap_seconds (60 sec with 10 sec io timeout.) After this, the bit is cleared and the target host will no longer be notified. The target host will typically generate three events for each set_event, once from each delta lease renewal (every 20 seconds) over the course of the set_bitmap_seconds.

Signed-off-by: David Teigland teigland@redhat.com

commit 93885cbfc6271ecb5007601369ad29cee3df6b99 Author: David Teigland teigland@redhat.com Date: Fri Apr 11 14:10:25 2014 -0500

sanlock: shutdown reply

A wait option (-w 1) can be added to sanlock shutdown. The shutdown command will wait for a result from the daemon indicating success (exiting), or failure (not exiting because lockspaces exist).

Signed-off-by: David Teigland teigland@redhat.com