redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

ocfs2/cluster: Maintain bitmap of quorum regions 

o2hb allows online adding of regions. However, a newly added region is not
used in quorum calculations unless it has been added on all nodes. This patch
tracks a bitmap of such quorum regions.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
hifive-unleashed-5.1
Sunil Mushran 2010-10-06 17:55:16 -07:00
parent e7d656baf6
commit 43182d2a79
1 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
fs/ocfs2/cluster/heartbeat.c
View File

@ -66,9 +66,12 @@ static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
* In global heartbeat, we maintain a series of region bitmaps.
* - o2hb_region_bitmap allows us to limit the region number to max region.
* - o2hb_live_region_bitmap tracks live regions (seen steady iterations).
* - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes
* heartbeat on it.
*/
static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
#define O2HB_DB_TYPE_LIVENODES 0
struct o2hb_debug_buf {
@ -607,6 +610,35 @@ static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
o2nm_node_put(node);
}
static void o2hb_set_quorum_device(struct o2hb_region *reg,
struct o2hb_disk_slot *slot)
{
assert_spin_locked(&o2hb_live_lock);
if (!o2hb_global_heartbeat_active())
return;
if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
return;
/*
* A region can be added to the quorum only when it sees all
* live nodes heartbeat on it. In other words, the region has been
* added to all nodes.
*/
if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap,
sizeof(o2hb_live_node_bitmap)))
return;
if (slot->ds_changed_samples < O2HB_LIVE_THRESHOLD)
return;
printk(KERN_NOTICE "o2hb: Region %s is now a quorum device\n",
config_item_name(&reg->hr_item));
set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
}
static int o2hb_check_slot(struct o2hb_region *reg,
struct o2hb_disk_slot *slot)
{
@ -772,6 +804,8 @@ fire_callbacks:
slot->ds_equal_samples = 0;
}
out:
o2hb_set_quorum_device(reg, slot);
spin_unlock(&o2hb_live_lock);
o2hb_run_event_list(&event);
@ -1138,6 +1172,7 @@ int o2hb_init(void)
memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
return o2hb_debug_init();
}