Merge with /home/shaggy/git/linus-clean/

1 files changed, 1797 insertions, 0 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
new file mode 100644
index 000000000000..7307ba528913
--- /dev/null
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -0,0 +1,1797 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/file.h>
+#include <linux/kthread.h>
+#include <linux/configfs.h>
+#include <linux/random.h>
+#include <linux/crc32.h>
+#include <linux/time.h>
+
+#include "heartbeat.h"
+#include "tcp.h"
+#include "nodemanager.h"
+#include "quorum.h"
+
+#include "masklog.h"
+
+
+/*
+ * The first heartbeat pass had one global thread that would serialize all hb
+ * callback calls.  This global serializing sem should only be removed once
+ * we've made sure that all callees can deal with being called concurrently
+ * from multiple hb region threads.
+ */
+static DECLARE_RWSEM(o2hb_callback_sem);
+
+/*
+ * multiple hb threads are watching multiple regions.  A node is live
+ * whenever any of the threads sees activity from the node in its region.
+ */
+static spinlock_t o2hb_live_lock = SPIN_LOCK_UNLOCKED;
+static struct list_head o2hb_live_slots[O2NM_MAX_NODES];
+static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
+static LIST_HEAD(o2hb_node_events);
+static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
+
+static LIST_HEAD(o2hb_all_regions);
+
+static struct o2hb_callback {
+        struct list_head list;
+} o2hb_callbacks[O2HB_NUM_CB];
+
+static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type);
+
+#define O2HB_DEFAULT_BLOCK_BITS       9
+
+unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
+
+/* Only sets a new threshold if there are no active regions. 
+ *
+ * No locking or otherwise interesting code is required for reading
+ * o2hb_dead_threshold as it can't change once regions are active and
+ * it's not interesting to anyone until then anyway. */
+static void o2hb_dead_threshold_set(unsigned int threshold)
+{
+        if (threshold > O2HB_MIN_DEAD_THRESHOLD) {
+                spin_lock(&o2hb_live_lock);
+                if (list_empty(&o2hb_all_regions))
+                        o2hb_dead_threshold = threshold;
+                spin_unlock(&o2hb_live_lock);
+        }
+}
+
+struct o2hb_node_event {
+        struct list_head        hn_item;
+        enum o2hb_callback_type hn_event_type;
+        struct o2nm_node        *hn_node;
+        int                     hn_node_num;
+};
+
+struct o2hb_disk_slot {
+        struct o2hb_disk_heartbeat_block *ds_raw_block;
+        u8                      ds_node_num;
+        u64                     ds_last_time;
+        u64                     ds_last_generation;
+        u16                     ds_equal_samples;
+        u16                     ds_changed_samples;
+        struct list_head        ds_live_item;
+};
+
+/* each thread owns a region.. when we're asked to tear down the region
+ * we ask the thread to stop, who cleans up the region */
+struct o2hb_region {
+        struct config_item      hr_item;
+
+        struct list_head        hr_all_item;
+        unsigned                hr_unclean_stop:1;
+
+        /* protected by the hr_callback_sem */
+        struct task_struct      *hr_task;
+
+        unsigned int            hr_blocks;
+        unsigned long long      hr_start_block;
+
+        unsigned int            hr_block_bits;
+        unsigned int            hr_block_bytes;
+
+        unsigned int            hr_slots_per_page;
+        unsigned int            hr_num_pages;
+
+        struct page             **hr_slot_data;
+        struct block_device     *hr_bdev;
+        struct o2hb_disk_slot   *hr_slots;
+
+        /* let the person setting up hb wait for it to return until it
+         * has reached a 'steady' state.  This will be fixed when we have
+         * a more complete api that doesn't lead to this sort of fragility. */
+        atomic_t                hr_steady_iterations;
+
+        char                    hr_dev_name[BDEVNAME_SIZE];
+
+        unsigned int            hr_timeout_ms;
+
+        /* randomized as the region goes up and down so that a node
+         * recognizes a node going up and down in one iteration */
+        u64                     hr_generation;
+
+        struct work_struct      hr_write_timeout_work;
+        unsigned long           hr_last_timeout_start;
+
+        /* Used during o2hb_check_slot to hold a copy of the block
+         * being checked because we temporarily have to zero out the
+         * crc field. */
+        struct o2hb_disk_heartbeat_block *hr_tmp_block;
+};
+
+struct o2hb_bio_wait_ctxt {
+        atomic_t          wc_num_reqs;
+        struct completion wc_io_complete;
+};
+
+static void o2hb_write_timeout(void *arg)
+{
+        struct o2hb_region *reg = arg;
+
+        mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u "
+             "milliseconds\n", reg->hr_dev_name,
+             jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); 
+        o2quo_disk_timeout();
+}
+
+static void o2hb_arm_write_timeout(struct o2hb_region *reg)
+{
+        mlog(0, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS);
+
+        cancel_delayed_work(&reg->hr_write_timeout_work);
+        reg->hr_last_timeout_start = jiffies;
+        schedule_delayed_work(&reg->hr_write_timeout_work,
+                              msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS));
+}
+
+static void o2hb_disarm_write_timeout(struct o2hb_region *reg)
+{
+        cancel_delayed_work(&reg->hr_write_timeout_work);
+        flush_scheduled_work();
+}
+
+static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc,
+                                      unsigned int num_ios)
+{
+        atomic_set(&wc->wc_num_reqs, num_ios);
+        init_completion(&wc->wc_io_complete);
+}
+
+/* Used in error paths too */
+static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
+                                     unsigned int num)
+{
+        /* sadly atomic_sub_and_test() isn't available on all platforms.  The
+         * good news is that the fast path only completes one at a time */
+        while(num--) {
+                if (atomic_dec_and_test(&wc->wc_num_reqs)) {
+                        BUG_ON(num > 0);
+                        complete(&wc->wc_io_complete);
+                }
+        }
+}
+
+static void o2hb_wait_on_io(struct o2hb_region *reg,
+                            struct o2hb_bio_wait_ctxt *wc)
+{
+        struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping;
+
+        blk_run_address_space(mapping);
+
+        wait_for_completion(&wc->wc_io_complete);
+}
+
+static int o2hb_bio_end_io(struct bio *bio,
+                           unsigned int bytes_done,
+                           int error)
+{
+        struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
+
+        if (error)
+                mlog(ML_ERROR, "IO Error %d\n", error);
+
+        if (bio->bi_size)
+                return 1;
+
+        o2hb_bio_wait_dec(wc, 1);
+        return 0;
+}
+
+/* Setup a Bio to cover I/O against num_slots slots starting at
+ * start_slot. */
+static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
+                                      struct o2hb_bio_wait_ctxt *wc,
+                                      unsigned int start_slot,
+                                      unsigned int num_slots)
+{
+        int i, nr_vecs, len, first_page, last_page;
+        unsigned int vec_len, vec_start;
+        unsigned int bits = reg->hr_block_bits;
+        unsigned int spp = reg->hr_slots_per_page;
+        struct bio *bio;
+        struct page *page;
+
+        nr_vecs = (num_slots + spp - 1) / spp;
+
+        /* Testing has shown this allocation to take long enough under
+         * GFP_KERNEL that the local node can get fenced. It would be
+         * nicest if we could pre-allocate these bios and avoid this
+         * all together. */
+        bio = bio_alloc(GFP_ATOMIC, nr_vecs);
+        if (!bio) {
+                mlog(ML_ERROR, "Could not alloc slots BIO!\n");
+                bio = ERR_PTR(-ENOMEM);
+                goto bail;
+        }
+
+        /* Must put everything in 512 byte sectors for the bio... */
+        bio->bi_sector = (reg->hr_start_block + start_slot) << (bits - 9);
+        bio->bi_bdev = reg->hr_bdev;
+        bio->bi_private = wc;
+        bio->bi_end_io = o2hb_bio_end_io;
+
+        first_page = start_slot / spp;
+        last_page = first_page + nr_vecs;
+        vec_start = (start_slot << bits) % PAGE_CACHE_SIZE;
+        for(i = first_page; i < last_page; i++) {
+                page = reg->hr_slot_data[i];
+
+                vec_len = PAGE_CACHE_SIZE;
+                /* last page might be short */
+                if (((i + 1) * spp) > (start_slot + num_slots))
+                        vec_len = ((num_slots + start_slot) % spp) << bits;
+                vec_len -=  vec_start;
+
+                mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
+                     i, vec_len, vec_start);
+
+                len = bio_add_page(bio, page, vec_len, vec_start);
+                if (len != vec_len) {
+                        bio_put(bio);
+                        bio = ERR_PTR(-EIO);
+
+                        mlog(ML_ERROR, "Error adding page to bio i = %d, "
+                             "vec_len = %u, len = %d\n, start = %u\n",
+                             i, vec_len, len, vec_start);
+                        goto bail;
+                }
+
+                vec_start = 0;
+        }
+
+bail:
+        return bio;
+}
+
+/*
+ * Compute the maximum number of sectors the bdev can handle in one bio,
+ * as a power of two.
+ *
+ * Stolen from oracleasm, thanks Joel!
+ */
+static int compute_max_sectors(struct block_device *bdev)
+{
+        int max_pages, max_sectors, pow_two_sectors;
+
+        struct request_queue *q;
+
+        q = bdev_get_queue(bdev);
+        max_pages = q->max_sectors >> (PAGE_SHIFT - 9);
+        if (max_pages > BIO_MAX_PAGES)
+                max_pages = BIO_MAX_PAGES;
+        if (max_pages > q->max_phys_segments)
+                max_pages = q->max_phys_segments;
+        if (max_pages > q->max_hw_segments)
+                max_pages = q->max_hw_segments;
+        max_pages--; /* Handle I/Os that straddle a page */
+
+        max_sectors = max_pages << (PAGE_SHIFT - 9);
+
+        /* Why is fls() 1-based???? */
+        pow_two_sectors = 1 << (fls(max_sectors) - 1);
+
+        return pow_two_sectors;
+}
+
+static inline void o2hb_compute_request_limits(struct o2hb_region *reg,
+                                               unsigned int num_slots,
+                                               unsigned int *num_bios,
+                                               unsigned int *slots_per_bio)
+{
+        unsigned int max_sectors, io_sectors;
+
+        max_sectors = compute_max_sectors(reg->hr_bdev);
+
+        io_sectors = num_slots << (reg->hr_block_bits - 9);
+
+        *num_bios = (io_sectors + max_sectors - 1) / max_sectors;
+        *slots_per_bio = max_sectors >> (reg->hr_block_bits - 9);
+
+        mlog(ML_HB_BIO, "My io size is %u sectors for %u slots. This "
+             "device can handle %u sectors of I/O\n", io_sectors, num_slots,
+             max_sectors);
+        mlog(ML_HB_BIO, "Will need %u bios holding %u slots each\n",
+             *num_bios, *slots_per_bio);
+}
+
+static int o2hb_read_slots(struct o2hb_region *reg,
+                           unsigned int max_slots)
+{
+        unsigned int num_bios, slots_per_bio, start_slot, num_slots;
+        int i, status;
+        struct o2hb_bio_wait_ctxt wc;
+        struct bio **bios;
+        struct bio *bio;
+
+        o2hb_compute_request_limits(reg, max_slots, &num_bios, &slots_per_bio);
+
+        bios = kcalloc(num_bios, sizeof(struct bio *), GFP_KERNEL);
+        if (!bios) {
+                status = -ENOMEM;
+                mlog_errno(status);
+                return status;
+        }
+
+        o2hb_bio_wait_init(&wc, num_bios);
+
+        num_slots = slots_per_bio;
+        for(i = 0; i < num_bios; i++) {
+                start_slot = i * slots_per_bio;
+
+                /* adjust num_slots at last bio */
+                if (max_slots < (start_slot + num_slots))
+                        num_slots = max_slots - start_slot;
+
+                bio = o2hb_setup_one_bio(reg, &wc, start_slot, num_slots);
+                if (IS_ERR(bio)) {
+                        o2hb_bio_wait_dec(&wc, num_bios - i);
+
+                        status = PTR_ERR(bio);
+                        mlog_errno(status);
+                        goto bail_and_wait;
+                }
+                bios[i] = bio;
+
+                submit_bio(READ, bio);
+        }
+
+        status = 0;
+
+bail_and_wait:
+        o2hb_wait_on_io(reg, &wc);
+
+        if (bios) {
+                for(i = 0; i < num_bios; i++)
+                        if (bios[i])
+                                bio_put(bios[i]);
+                kfree(bios);
+        }
+
+        return status;
+}
+
+static int o2hb_issue_node_write(struct o2hb_region *reg,
+                                 struct bio **write_bio,
+                                 struct o2hb_bio_wait_ctxt *write_wc)
+{
+        int status;
+        unsigned int slot;
+        struct bio *bio;
+
+        o2hb_bio_wait_init(write_wc, 1);
+
+        slot = o2nm_this_node();
+
+        bio = o2hb_setup_one_bio(reg, write_wc, slot, 1);
+        if (IS_ERR(bio)) {
+                status = PTR_ERR(bio);
+                mlog_errno(status);
+                goto bail;
+        }
+
+        submit_bio(WRITE, bio);
+
+        *write_bio = bio;
+        status = 0;
+bail:
+        return status;
+}
+
+static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg,
+                                     struct o2hb_disk_heartbeat_block *hb_block)
+{
+        __le32 old_cksum;
+        u32 ret;
+
+        /* We want to compute the block crc with a 0 value in the
+         * hb_cksum field. Save it off here and replace after the
+         * crc. */
+        old_cksum = hb_block->hb_cksum;
+        hb_block->hb_cksum = 0;
+
+        ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes);
+
+        hb_block->hb_cksum = old_cksum;
+
+        return ret;
+}
+
+static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block)
+{
+        mlog(ML_ERROR, "Dump slot information: seq = 0x%"MLFx64", node = %u, "
+             "cksum = 0x%x, generation 0x%"MLFx64"\n",
+             le64_to_cpu(hb_block->hb_seq), hb_block->hb_node,
+             le32_to_cpu(hb_block->hb_cksum),
+             le64_to_cpu(hb_block->hb_generation));
+}
+
+static int o2hb_verify_crc(struct o2hb_region *reg,
+                           struct o2hb_disk_heartbeat_block *hb_block)
+{
+        u32 read, computed;
+
+        read = le32_to_cpu(hb_block->hb_cksum);
+        computed = o2hb_compute_block_crc_le(reg, hb_block);
+
+        return read == computed;
+}
+
+/* We want to make sure that nobody is heartbeating on top of us --
+ * this will help detect an invalid configuration. */
+static int o2hb_check_last_timestamp(struct o2hb_region *reg)
+{
+        int node_num, ret;
+        struct o2hb_disk_slot *slot;
+        struct o2hb_disk_heartbeat_block *hb_block;
+
+        node_num = o2nm_this_node();
+
+        ret = 1;
+        slot = &reg->hr_slots[node_num];
+        /* Don't check on our 1st timestamp */
+        if (slot->ds_last_time) {
+                hb_block = slot->ds_raw_block;
+
+                if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time)
+                        ret = 0;
+        }
+
+        return ret;
+}
+
+static inline void o2hb_prepare_block(struct o2hb_region *reg,
+                                      u64 generation)
+{
+        int node_num;
+        u64 cputime;
+        struct o2hb_disk_slot *slot;
+        struct o2hb_disk_heartbeat_block *hb_block;
+
+        node_num = o2nm_this_node();
+        slot = &reg->hr_slots[node_num];
+
+        hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block;
+        memset(hb_block, 0, reg->hr_block_bytes);
+        /* TODO: time stuff */
+        cputime = CURRENT_TIME.tv_sec;
+        if (!cputime)
+                cputime = 1;
+
+        hb_block->hb_seq = cpu_to_le64(cputime);
+        hb_block->hb_node = node_num;
+        hb_block->hb_generation = cpu_to_le64(generation);
+
+        /* This step must always happen last! */
+        hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg,
+                                                                   hb_block));
+
+        mlog(ML_HB_BIO, "our node generation = 0x%"MLFx64", cksum = 0x%x\n",
+             cpu_to_le64(generation), le32_to_cpu(hb_block->hb_cksum));
+}
+
+static void o2hb_fire_callbacks(struct o2hb_callback *hbcall,
+                                struct o2nm_node *node,
+                                int idx)
+{
+        struct list_head *iter;
+        struct o2hb_callback_func *f;
+
+        list_for_each(iter, &hbcall->list) {
+                f = list_entry(iter, struct o2hb_callback_func, hc_item);
+                mlog(ML_HEARTBEAT, "calling funcs %p\n", f);
+                (f->hc_func)(node, idx, f->hc_data);
+        }
+}
+
+/* Will run the list in order until we process the passed event */
+static void o2hb_run_event_list(struct o2hb_node_event *queued_event)
+{
+        int empty;
+        struct o2hb_callback *hbcall;
+        struct o2hb_node_event *event;
+
+        spin_lock(&o2hb_live_lock);
+        empty = list_empty(&queued_event->hn_item);
+        spin_unlock(&o2hb_live_lock);
+        if (empty)
+                return;
+
+        /* Holding callback sem assures we don't alter the callback
+         * lists when doing this, and serializes ourselves with other
+         * processes wanting callbacks. */
+        down_write(&o2hb_callback_sem);
+
+        spin_lock(&o2hb_live_lock);
+        while (!list_empty(&o2hb_node_events)
+               && !list_empty(&queued_event->hn_item)) {
+                event = list_entry(o2hb_node_events.next,
+                                   struct o2hb_node_event,
+                                   hn_item);
+                list_del_init(&event->hn_item);
+                spin_unlock(&o2hb_live_lock);
+
+                mlog(ML_HEARTBEAT, "Node %s event for %d\n",
+                     event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN",
+                     event->hn_node_num);
+
+                hbcall = hbcall_from_type(event->hn_event_type);
+
+                /* We should *never* have gotten on to the list with a
+                 * bad type... This isn't something that we should try
+                 * to recover from. */
+                BUG_ON(IS_ERR(hbcall));
+
+                o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num);
+
+                spin_lock(&o2hb_live_lock);
+        }
+        spin_unlock(&o2hb_live_lock);
+
+        up_write(&o2hb_callback_sem);
+}
+
+static void o2hb_queue_node_event(struct o2hb_node_event *event,
+                                  enum o2hb_callback_type type,
+                                  struct o2nm_node *node,
+                                  int node_num)
+{
+        assert_spin_locked(&o2hb_live_lock);
+
+        event->hn_event_type = type;
+        event->hn_node = node;
+        event->hn_node_num = node_num;
+
+        mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n",
+             type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num);
+
+        list_add_tail(&event->hn_item, &o2hb_node_events);
+}
+
+static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
+{
+        struct o2hb_node_event event =
+                { .hn_item = LIST_HEAD_INIT(event.hn_item), };
+        struct o2nm_node *node;
+
+        node = o2nm_get_node_by_num(slot->ds_node_num);
+        if (!node)
+                return;
+
+        spin_lock(&o2hb_live_lock);
+        if (!list_empty(&slot->ds_live_item)) {
+                mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n",
+                     slot->ds_node_num);
+
+                list_del_init(&slot->ds_live_item);
+
+                if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
+                        clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
+
+                        o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
+                                              slot->ds_node_num);
+                }
+        }
+        spin_unlock(&o2hb_live_lock);
+
+        o2hb_run_event_list(&event);
+
+        o2nm_node_put(node);
+}
+
+static int o2hb_check_slot(struct o2hb_region *reg,
+                           struct o2hb_disk_slot *slot)
+{
+        int changed = 0, gen_changed = 0;
+        struct o2hb_node_event event =
+                { .hn_item = LIST_HEAD_INIT(event.hn_item), };
+        struct o2nm_node *node;
+        struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block;
+        u64 cputime;
+
+        memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes);
+
+        /* Is this correct? Do we assume that the node doesn't exist
+         * if we're not configured for him? */
+        node = o2nm_get_node_by_num(slot->ds_node_num);
+        if (!node)
+                return 0;
+
+        if (!o2hb_verify_crc(reg, hb_block)) {
+                /* all paths from here will drop o2hb_live_lock for
+                 * us. */
+                spin_lock(&o2hb_live_lock);
+
+                /* Don't print an error on the console in this case -
+                 * a freshly formatted heartbeat area will not have a
+                 * crc set on it. */
+                if (list_empty(&slot->ds_live_item))
+                        goto out;
+
+                /* The node is live but pushed out a bad crc. We
+                 * consider it a transient miss but don't populate any
+                 * other values as they may be junk. */
+                mlog(ML_ERROR, "Node %d has written a bad crc to %s\n",
+                     slot->ds_node_num, reg->hr_dev_name);
+                o2hb_dump_slot(hb_block);
+
+                slot->ds_equal_samples++;
+                goto fire_callbacks;
+        }
+
+        /* we don't care if these wrap.. the state transitions below
+         * clear at the right places */
+        cputime = le64_to_cpu(hb_block->hb_seq);
+        if (slot->ds_last_time != cputime)
+                slot->ds_changed_samples++;
+        else
+                slot->ds_equal_samples++;
+        slot->ds_last_time = cputime;
+
+        /* The node changed heartbeat generations. We assume this to
+         * mean it dropped off but came back before we timed out. We
+         * want to consider it down for the time being but don't want
+         * to lose any changed_samples state we might build up to
+         * considering it live again. */
+        if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) {
+                gen_changed = 1;
+                slot->ds_equal_samples = 0;
+                mlog(ML_HEARTBEAT, "Node %d changed generation (0x%"MLFx64" "
+                     "to 0x%"MLFx64")\n", slot->ds_node_num,
+                     slot->ds_last_generation,
+                     le64_to_cpu(hb_block->hb_generation));
+        }
+
+        slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
+
+        mlog(ML_HEARTBEAT, "Slot %d gen 0x%"MLFx64" cksum 0x%x "
+             "seq %"MLFu64" last %"MLFu64" changed %u equal %u\n",
+             slot->ds_node_num, slot->ds_last_generation,
+             le32_to_cpu(hb_block->hb_cksum), le64_to_cpu(hb_block->hb_seq), 
+             slot->ds_last_time, slot->ds_changed_samples,
+             slot->ds_equal_samples);
+
+        spin_lock(&o2hb_live_lock);
+
+fire_callbacks:
+        /* dead nodes only come to life after some number of
+         * changes at any time during their dead time */
+        if (list_empty(&slot->ds_live_item) &&
+            slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) {
+                mlog(ML_HEARTBEAT, "Node %d (id 0x%"MLFx64") joined my "
+                     "region\n", slot->ds_node_num, slot->ds_last_generation);
+
+                /* first on the list generates a callback */
+                if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
+                        set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
+
+                        o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node,
+                                              slot->ds_node_num);
+
+                        changed = 1;
+                }
+
+                list_add_tail(&slot->ds_live_item,
+                              &o2hb_live_slots[slot->ds_node_num]);
+
+                slot->ds_equal_samples = 0;
+                goto out;
+        }
+
+        /* if the list is dead, we're done.. */
+        if (list_empty(&slot->ds_live_item))
+                goto out;
+
+        /* live nodes only go dead after enough consequtive missed
+         * samples..  reset the missed counter whenever we see
+         * activity */
+        if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) {
+                mlog(ML_HEARTBEAT, "Node %d left my region\n",
+                     slot->ds_node_num);
+
+                /* last off the live_slot generates a callback */
+                list_del_init(&slot->ds_live_item);
+                if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
+                        clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
+
+                        o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
+                                              slot->ds_node_num);
+
+                        changed = 1;
+                }
+
+                /* We don't clear this because the node is still
+                 * actually writing new blocks. */
+                if (!gen_changed)
+                        slot->ds_changed_samples = 0;
+                goto out;
+        }
+        if (slot->ds_changed_samples) {
+                slot->ds_changed_samples = 0;
+                slot->ds_equal_samples = 0;
+        }
+out:
+        spin_unlock(&o2hb_live_lock);
+
+        o2hb_run_event_list(&event);
+
+        o2nm_node_put(node);
+        return changed;
+}
+
+/* This could be faster if we just implmented a find_last_bit, but I
+ * don't think the circumstances warrant it. */
+static int o2hb_highest_node(unsigned long *nodes,
+                             int numbits)
+{
+        int highest, node;
+
+        highest = numbits;
+        node = -1;
+        while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) {
+                if (node >= numbits)
+                        break;
+
+                highest = node;
+        }
+
+        return highest;
+}
+
+static void o2hb_do_disk_heartbeat(struct o2hb_region *reg)
+{
+        int i, ret, highest_node, change = 0;
+        unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
+        struct bio *write_bio;
+        struct o2hb_bio_wait_ctxt write_wc;
+
+        if (o2nm_configured_node_map(configured_nodes, sizeof(configured_nodes)))
+                return;
+
+        highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
+        if (highest_node >= O2NM_MAX_NODES) {
+                mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n");
+                return;
+        }
+
+        /* No sense in reading the slots of nodes that don't exist
+         * yet. Of course, if the node definitions have holes in them
+         * then we're reading an empty slot anyway... Consider this
+         * best-effort. */
+        ret = o2hb_read_slots(reg, highest_node + 1);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return;
+        }
+
+        /* With an up to date view of the slots, we can check that no
+         * other node has been improperly configured to heartbeat in
+         * our slot. */
+        if (!o2hb_check_last_timestamp(reg))
+                mlog(ML_ERROR, "Device \"%s\": another node is heartbeating "
+                     "in our slot!\n", reg->hr_dev_name);
+
+        /* fill in the proper info for our next heartbeat */
+        o2hb_prepare_block(reg, reg->hr_generation);
+
+        /* And fire off the write. Note that we don't wait on this I/O
+         * until later. */
+        ret = o2hb_issue_node_write(reg, &write_bio, &write_wc);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return;
+        }
+
+        i = -1;
+        while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
+
+                change |= o2hb_check_slot(reg, &reg->hr_slots[i]);
+        }
+
+        /*
+         * We have to be sure we've advertised ourselves on disk
+         * before we can go to steady state.  This ensures that
+         * people we find in our steady state have seen us.
+         */
+        o2hb_wait_on_io(reg, &write_wc);
+        bio_put(write_bio);
+        o2hb_arm_write_timeout(reg);
+
+        /* let the person who launched us know when things are steady */
+        if (!change && (atomic_read(&reg->hr_steady_iterations) != 0)) {
+                if (atomic_dec_and_test(&reg->hr_steady_iterations))
+                        wake_up(&o2hb_steady_queue);
+        }
+}
+
+/* Subtract b from a, storing the result in a. a *must* have a larger
+ * value than b. */
+static void o2hb_tv_subtract(struct timeval *a,
+                             struct timeval *b)
+{
+        /* just return 0 when a is after b */
+        if (a->tv_sec < b->tv_sec ||
+            (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) {
+                a->tv_sec = 0;
+                a->tv_usec = 0;
+                return;
+        }
+
+        a->tv_sec -= b->tv_sec;
+        a->tv_usec -= b->tv_usec;
+        while ( a->tv_usec < 0 ) {
+                a->tv_sec--;
+                a->tv_usec += 1000000;
+        }
+}
+
+static unsigned int o2hb_elapsed_msecs(struct timeval *start,
+                                       struct timeval *end)
+{
+        struct timeval res = *end;
+
+        o2hb_tv_subtract(&res, start);
+
+        return res.tv_sec * 1000 + res.tv_usec / 1000;
+}
+
+/*
+ * we ride the region ref that the region dir holds.  before the region
+ * dir is removed and drops it ref it will wait to tear down this
+ * thread.
+ */
+static int o2hb_thread(void *data)
+{
+        int i, ret;
+        struct o2hb_region *reg = data;
+        struct bio *write_bio;
+        struct o2hb_bio_wait_ctxt write_wc;
+        struct timeval before_hb, after_hb;
+        unsigned int elapsed_msec;
+
+        mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n");
+
+        set_user_nice(current, -20);
+
+        while (!kthread_should_stop() && !reg->hr_unclean_stop) {
+                /* We track the time spent inside
+                 * o2hb_do_disk_heartbeat so that we avoid more then
+                 * hr_timeout_ms between disk writes. On busy systems
+                 * this should result in a heartbeat which is less
+                 * likely to time itself out. */
+                do_gettimeofday(&before_hb);
+
+                o2hb_do_disk_heartbeat(reg);
+
+                do_gettimeofday(&after_hb);
+                elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb);
+
+                mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
+                     before_hb.tv_sec, before_hb.tv_usec,
+                     after_hb.tv_sec, after_hb.tv_usec, elapsed_msec);
+
+                if (elapsed_msec < reg->hr_timeout_ms) {
+                        /* the kthread api has blocked signals for us so no
+                         * need to record the return value. */
+                        msleep_interruptible(reg->hr_timeout_ms - elapsed_msec);
+                }
+        }
+
+        o2hb_disarm_write_timeout(reg);
+
+        /* unclean stop is only used in very bad situation */
+        for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++)
+                o2hb_shutdown_slot(&reg->hr_slots[i]);
+
+        /* Explicit down notification - avoid forcing the other nodes
+         * to timeout on this region when we could just as easily
+         * write a clear generation - thus indicating to them that
+         * this node has left this region.
+         *
+         * XXX: Should we skip this on unclean_stop? */
+        o2hb_prepare_block(reg, 0);
+        ret = o2hb_issue_node_write(reg, &write_bio, &write_wc);
+        if (ret == 0) {
+                o2hb_wait_on_io(reg, &write_wc);
+                bio_put(write_bio);
+        } else {
+                mlog_errno(ret);
+        }
+
+        mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n");
+
+        return 0;
+}
+
+void o2hb_init(void)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++)
+                INIT_LIST_HEAD(&o2hb_callbacks[i].list);
+
+        for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++)
+                INIT_LIST_HEAD(&o2hb_live_slots[i]);
+
+        INIT_LIST_HEAD(&o2hb_node_events);
+
+        memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
+}
+
+/* if we're already in a callback then we're already serialized by the sem */
+static void o2hb_fill_node_map_from_callback(unsigned long *map,
+                                             unsigned bytes)
+{
+        BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
+
+        memcpy(map, &o2hb_live_node_bitmap, bytes);
+}
+
+/*
+ * get a map of all nodes that are heartbeating in any regions
+ */
+void o2hb_fill_node_map(unsigned long *map, unsigned bytes)
+{
+        /* callers want to serialize this map and callbacks so that they
+         * can trust that they don't miss nodes coming to the party */
+        down_read(&o2hb_callback_sem);
+        spin_lock(&o2hb_live_lock);
+        o2hb_fill_node_map_from_callback(map, bytes);
+        spin_unlock(&o2hb_live_lock);
+        up_read(&o2hb_callback_sem);
+}
+EXPORT_SYMBOL_GPL(o2hb_fill_node_map);
+
+/*
+ * heartbeat configfs bits.  The heartbeat set is a default set under
+ * the cluster set in nodemanager.c.
+ */
+
+static struct o2hb_region *to_o2hb_region(struct config_item *item)
+{
+        return item ? container_of(item, struct o2hb_region, hr_item) : NULL;
+}
+
+/* drop_item only drops its ref after killing the thread, nothing should
+ * be using the region anymore.  this has to clean up any state that
+ * attributes might have built up. */
+static void o2hb_region_release(struct config_item *item)
+{
+        int i;
+        struct page *page;
+        struct o2hb_region *reg = to_o2hb_region(item);
+
+        if (reg->hr_tmp_block)
+                kfree(reg->hr_tmp_block);
+
+        if (reg->hr_slot_data) {
+                for (i = 0; i < reg->hr_num_pages; i++) {
+                        page = reg->hr_slot_data[i];
+                        if (page)
+                                __free_page(page);
+                }
+                kfree(reg->hr_slot_data);
+        }
+
+        if (reg->hr_bdev)
+                blkdev_put(reg->hr_bdev);
+
+        if (reg->hr_slots)
+                kfree(reg->hr_slots);
+
+        spin_lock(&o2hb_live_lock);
+        list_del(&reg->hr_all_item);
+        spin_unlock(&o2hb_live_lock);
+
+        kfree(reg);
+}
+
+static int o2hb_read_block_input(struct o2hb_region *reg,
+                                 const char *page,
+                                 size_t count,
+                                 unsigned long *ret_bytes,
+                                 unsigned int *ret_bits)
+{
+        unsigned long bytes;
+        char *p = (char *)page;
+
+        bytes = simple_strtoul(p, &p, 0);
+        if (!p || (*p && (*p != '\n')))
+                return -EINVAL;
+
+        /* Heartbeat and fs min / max block sizes are the same. */
+        if (bytes > 4096 || bytes < 512)
+                return -ERANGE;
+        if (hweight16(bytes) != 1)
+                return -EINVAL;
+
+        if (ret_bytes)
+                *ret_bytes = bytes;
+        if (ret_bits)
+                *ret_bits = ffs(bytes) - 1;
+
+        return 0;
+}
+
+static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg,
+                                            char *page)
+{
+        return sprintf(page, "%u\n", reg->hr_block_bytes);
+}
+
+static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg,
+                                             const char *page,
+                                             size_t count)
+{
+        int status;
+        unsigned long block_bytes;
+        unsigned int block_bits;
+
+        if (reg->hr_bdev)
+                return -EINVAL;
+
+        status = o2hb_read_block_input(reg, page, count,
+                                       &block_bytes, &block_bits);
+        if (status)
+                return status;
+
+        reg->hr_block_bytes = (unsigned int)block_bytes;
+        reg->hr_block_bits = block_bits;
+
+        return count;
+}
+
+static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg,
+                                            char *page)
+{
+        return sprintf(page, "%llu\n", reg->hr_start_block);
+}
+
+static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg,
+                                             const char *page,
+                                             size_t count)
+{
+        unsigned long long tmp;
+        char *p = (char *)page;
+
+        if (reg->hr_bdev)
+                return -EINVAL;
+
+        tmp = simple_strtoull(p, &p, 0);
+        if (!p || (*p && (*p != '\n')))
+                return -EINVAL;
+
+        reg->hr_start_block = tmp;
+
+        return count;
+}
+
+static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg,
+                                       char *page)
+{
+        return sprintf(page, "%d\n", reg->hr_blocks);
+}
+
+static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg,
+                                        const char *page,
+                                        size_t count)
+{
+        unsigned long tmp;
+        char *p = (char *)page;
+
+        if (reg->hr_bdev)
+                return -EINVAL;
+
+        tmp = simple_strtoul(p, &p, 0);
+        if (!p || (*p && (*p != '\n')))
+                return -EINVAL;
+
+        if (tmp > O2NM_MAX_NODES || tmp == 0)
+                return -ERANGE;
+
+        reg->hr_blocks = (unsigned int)tmp;
+
+        return count;
+}
+
+static ssize_t o2hb_region_dev_read(struct o2hb_region *reg,
+                                    char *page)
+{
+        unsigned int ret = 0;
+
+        if (reg->hr_bdev)
+                ret = sprintf(page, "%s\n", reg->hr_dev_name);
+
+        return ret;
+}
+
+static void o2hb_init_region_params(struct o2hb_region *reg)
+{
+        reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits;
+        reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS;
+
+        mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n",
+             reg->hr_start_block, reg->hr_blocks);
+        mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n",
+             reg->hr_block_bytes, reg->hr_block_bits);
+        mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms);
+        mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold);
+}
+
+static int o2hb_map_slot_data(struct o2hb_region *reg)
+{
+        int i, j;
+        unsigned int last_slot;
+        unsigned int spp = reg->hr_slots_per_page;
+        struct page *page;
+        char *raw;
+        struct o2hb_disk_slot *slot;
+
+        reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL);
+        if (reg->hr_tmp_block == NULL) {
+                mlog_errno(-ENOMEM);
+                return -ENOMEM;
+        }
+
+        reg->hr_slots = kcalloc(reg->hr_blocks,
+                                sizeof(struct o2hb_disk_slot), GFP_KERNEL);
+        if (reg->hr_slots == NULL) {
+                mlog_errno(-ENOMEM);
+                return -ENOMEM;
+        }
+
+        for(i = 0; i < reg->hr_blocks; i++) {
+                slot = &reg->hr_slots[i];
+                slot->ds_node_num = i;
+                INIT_LIST_HEAD(&slot->ds_live_item);
+                slot->ds_raw_block = NULL;
+        }
+
+        reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp;
+        mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks "
+                           "at %u blocks per page\n",
+             reg->hr_num_pages, reg->hr_blocks, spp);
+
+        reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *),
+                                    GFP_KERNEL);
+        if (!reg->hr_slot_data) {
+                mlog_errno(-ENOMEM);
+                return -ENOMEM;
+        }
+
+        for(i = 0; i < reg->hr_num_pages; i++) {
+                page = alloc_page(GFP_KERNEL);
+                if (!page) {
+                        mlog_errno(-ENOMEM);
+                        return -ENOMEM;
+                }
+
+                reg->hr_slot_data[i] = page;
+
+                last_slot = i * spp;
+                raw = page_address(page);
+                for (j = 0;
+                     (j < spp) && ((j + last_slot) < reg->hr_blocks);
+                     j++) {
+                        BUG_ON((j + last_slot) >= reg->hr_blocks);
+
+                        slot = &reg->hr_slots[j + last_slot];
+                        slot->ds_raw_block =
+                                (struct o2hb_disk_heartbeat_block *) raw;
+
+                        raw += reg->hr_block_bytes;
+                }
+        }
+
+        return 0;
+}
+
+/* Read in all the slots available and populate the tracking
+ * structures so that we can start with a baseline idea of what's
+ * there. */
+static int o2hb_populate_slot_data(struct o2hb_region *reg)
+{
+        int ret, i;
+        struct o2hb_disk_slot *slot;
+        struct o2hb_disk_heartbeat_block *hb_block;
+
+        mlog_entry_void();
+
+        ret = o2hb_read_slots(reg, reg->hr_blocks);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /* We only want to get an idea of the values initially in each
+         * slot, so we do no verification - o2hb_check_slot will
+         * actually determine if each configured slot is valid and
+         * whether any values have changed. */
+        for(i = 0; i < reg->hr_blocks; i++) {
+                slot = &reg->hr_slots[i];
+                hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block;
+
+                /* Only fill the values that o2hb_check_slot uses to
+                 * determine changing slots */
+                slot->ds_last_time = le64_to_cpu(hb_block->hb_seq);
+                slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
+        }
+
+out:
+        mlog_exit(ret);
+        return ret;
+}
+
+/* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
+static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
+                                     const char *page,
+                                     size_t count)
+{
+        long fd;
+        int sectsize;
+        char *p = (char *)page;
+        struct file *filp = NULL;
+        struct inode *inode = NULL;
+        ssize_t ret = -EINVAL;
+
+        if (reg->hr_bdev)
+                goto out;
+
+        /* We can't heartbeat without having had our node number
+         * configured yet. */
+        if (o2nm_this_node() == O2NM_MAX_NODES)
+                goto out;
+
+        fd = simple_strtol(p, &p, 0);
+        if (!p || (*p && (*p != '\n')))
+                goto out;
+
+        if (fd < 0 || fd >= INT_MAX)
+                goto out;
+
+        filp = fget(fd);
+        if (filp == NULL)
+                goto out;
+
+        if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
+            reg->hr_block_bytes == 0)
+                goto out;
+
+        inode = igrab(filp->f_mapping->host);
+        if (inode == NULL)
+                goto out;
+
+        if (!S_ISBLK(inode->i_mode))
+                goto out;
+
+        reg->hr_bdev = I_BDEV(filp->f_mapping->host);
+        ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, 0);
+        if (ret) {
+                reg->hr_bdev = NULL;
+                goto out;
+        }
+        inode = NULL;
+
+        bdevname(reg->hr_bdev, reg->hr_dev_name);
+
+        sectsize = bdev_hardsect_size(reg->hr_bdev);
+        if (sectsize != reg->hr_block_bytes) {
+                mlog(ML_ERROR,
+                     "blocksize %u incorrect for device, expected %d",
+                     reg->hr_block_bytes, sectsize);
+                ret = -EINVAL;
+                goto out;
+        }
+
+        o2hb_init_region_params(reg);
+
+        /* Generation of zero is invalid */
+        do {
+                get_random_bytes(&reg->hr_generation,
+                                 sizeof(reg->hr_generation));
+        } while (reg->hr_generation == 0);
+
+        ret = o2hb_map_slot_data(reg);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = o2hb_populate_slot_data(reg);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        INIT_WORK(&reg->hr_write_timeout_work, o2hb_write_timeout, reg);
+
+        /*
+         * A node is considered live after it has beat LIVE_THRESHOLD
+         * times.  We're not steady until we've given them a chance
+         * _after_ our first read.
+         */
+        atomic_set(&reg->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1);
+
+        reg->hr_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
+                                   reg->hr_item.ci_name);
+        if (IS_ERR(reg->hr_task)) {
+                ret = PTR_ERR(reg->hr_task);
+                mlog_errno(ret);
+                reg->hr_task = NULL;
+                goto out;
+        }
+
+        ret = wait_event_interruptible(o2hb_steady_queue,
+                                atomic_read(&reg->hr_steady_iterations) == 0);
+        if (ret) {
+                kthread_stop(reg->hr_task);
+                reg->hr_task = NULL;
+                goto out;
+        }
+
+        ret = count;
+out:
+        if (filp)
+                fput(filp);
+        if (inode)
+                iput(inode);
+        if (ret < 0) {
+                if (reg->hr_bdev) {
+                        blkdev_put(reg->hr_bdev);
+                        reg->hr_bdev = NULL;
+                }
+        }
+        return ret;
+}
+
+struct o2hb_region_attribute {
+        struct configfs_attribute attr;
+        ssize_t (*show)(struct o2hb_region *, char *);
+        ssize_t (*store)(struct o2hb_region *, const char *, size_t);
+};
+
+static struct o2hb_region_attribute o2hb_region_attr_block_bytes = {
+        .attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "block_bytes",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+        .show   = o2hb_region_block_bytes_read,
+        .store  = o2hb_region_block_bytes_write,
+};
+
+static struct o2hb_region_attribute o2hb_region_attr_start_block = {
+        .attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "start_block",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+        .show   = o2hb_region_start_block_read,
+        .store  = o2hb_region_start_block_write,
+};
+
+static struct o2hb_region_attribute o2hb_region_attr_blocks = {
+        .attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "blocks",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+        .show   = o2hb_region_blocks_read,
+        .store  = o2hb_region_blocks_write,
+};
+
+static struct o2hb_region_attribute o2hb_region_attr_dev = {
+        .attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "dev",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+        .show   = o2hb_region_dev_read,
+        .store  = o2hb_region_dev_write,
+};
+
+static struct configfs_attribute *o2hb_region_attrs[] = {
+        &o2hb_region_attr_block_bytes.attr,
+        &o2hb_region_attr_start_block.attr,
+        &o2hb_region_attr_blocks.attr,
+        &o2hb_region_attr_dev.attr,
+        NULL,
+};
+
+static ssize_t o2hb_region_show(struct config_item *item,
+                                struct configfs_attribute *attr,
+                                char *page)
+{
+        struct o2hb_region *reg = to_o2hb_region(item);
+        struct o2hb_region_attribute *o2hb_region_attr =
+                container_of(attr, struct o2hb_region_attribute, attr);
+        ssize_t ret = 0;
+
+        if (o2hb_region_attr->show)
+                ret = o2hb_region_attr->show(reg, page);
+        return ret;
+}
+
+static ssize_t o2hb_region_store(struct config_item *item,
+                                 struct configfs_attribute *attr,
+                                 const char *page, size_t count)
+{
+        struct o2hb_region *reg = to_o2hb_region(item);
+        struct o2hb_region_attribute *o2hb_region_attr =
+                container_of(attr, struct o2hb_region_attribute, attr);
+        ssize_t ret = -EINVAL;
+
+        if (o2hb_region_attr->store)
+                ret = o2hb_region_attr->store(reg, page, count);
+        return ret;
+}
+
+static struct configfs_item_operations o2hb_region_item_ops = {
+        .release                = o2hb_region_release,
+        .show_attribute         = o2hb_region_show,
+        .store_attribute        = o2hb_region_store,
+};
+
+static struct config_item_type o2hb_region_type = {
+        .ct_item_ops    = &o2hb_region_item_ops,
+        .ct_attrs       = o2hb_region_attrs,
+        .ct_owner       = THIS_MODULE,
+};
+
+/* heartbeat set */
+
+struct o2hb_heartbeat_group {
+        struct config_group hs_group;
+        /* some stuff? */
+};
+
+static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group)
+{
+        return group ?
+                container_of(group, struct o2hb_heartbeat_group, hs_group)
+                : NULL;
+}
+
+static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
+                                                          const char *name)
+{
+        struct o2hb_region *reg = NULL;
+        struct config_item *ret = NULL;
+
+        reg = kcalloc(1, sizeof(struct o2hb_region), GFP_KERNEL);
+        if (reg == NULL)
+                goto out; /* ENOMEM */
+
+        config_item_init_type_name(&reg->hr_item, name, &o2hb_region_type);
+
+        ret = &reg->hr_item;
+
+        spin_lock(&o2hb_live_lock);
+        list_add_tail(&reg->hr_all_item, &o2hb_all_regions);
+        spin_unlock(&o2hb_live_lock);
+out:
+        if (ret == NULL)
+                kfree(reg);
+
+        return ret;
+}
+
+static void o2hb_heartbeat_group_drop_item(struct config_group *group,
+                                           struct config_item *item)
+{
+        struct o2hb_region *reg = to_o2hb_region(item);
+
+        /* stop the thread when the user removes the region dir */
+        if (reg->hr_task) {
+                kthread_stop(reg->hr_task);
+                reg->hr_task = NULL;
+        }
+
+        config_item_put(item);
+}
+
+struct o2hb_heartbeat_group_attribute {
+        struct configfs_attribute attr;
+        ssize_t (*show)(struct o2hb_heartbeat_group *, char *);
+        ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t);
+};
+
+static ssize_t o2hb_heartbeat_group_show(struct config_item *item,
+                                         struct configfs_attribute *attr,
+                                         char *page)
+{
+        struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
+        struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
+                container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
+        ssize_t ret = 0;
+
+        if (o2hb_heartbeat_group_attr->show)
+                ret = o2hb_heartbeat_group_attr->show(reg, page);
+        return ret;
+}
+
+static ssize_t o2hb_heartbeat_group_store(struct config_item *item,
+                                          struct configfs_attribute *attr,
+                                          const char *page, size_t count)
+{
+        struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
+        struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
+                container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
+        ssize_t ret = -EINVAL;
+
+        if (o2hb_heartbeat_group_attr->store)
+                ret = o2hb_heartbeat_group_attr->store(reg, page, count);
+        return ret;
+}
+
+static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group,
+                                                     char *page)
+{
+        return sprintf(page, "%u\n", o2hb_dead_threshold);
+}
+
+static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group,
+                                                    const char *page,
+                                                    size_t count)
+{
+        unsigned long tmp;
+        char *p = (char *)page;
+
+        tmp = simple_strtoul(p, &p, 10);
+        if (!p || (*p && (*p != '\n')))
+                return -EINVAL;
+
+        /* this will validate ranges for us. */
+        o2hb_dead_threshold_set((unsigned int) tmp);
+
+        return count;
+}
+
+static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = {
+        .attr   = { .ca_owner = THIS_MODULE,
+                    .ca_name = "dead_threshold",
+                    .ca_mode = S_IRUGO | S_IWUSR },
+        .show   = o2hb_heartbeat_group_threshold_show,
+        .store  = o2hb_heartbeat_group_threshold_store,
+};
+
+static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = {
+        &o2hb_heartbeat_group_attr_threshold.attr,
+        NULL,
+};
+
+static struct configfs_item_operations o2hb_hearbeat_group_item_ops = {
+        .show_attribute         = o2hb_heartbeat_group_show,
+        .store_attribute        = o2hb_heartbeat_group_store,
+};
+
+static struct configfs_group_operations o2hb_heartbeat_group_group_ops = {
+        .make_item      = o2hb_heartbeat_group_make_item,
+        .drop_item      = o2hb_heartbeat_group_drop_item,
+};
+
+static struct config_item_type o2hb_heartbeat_group_type = {
+        .ct_group_ops   = &o2hb_heartbeat_group_group_ops,
+        .ct_item_ops    = &o2hb_hearbeat_group_item_ops,
+        .ct_attrs       = o2hb_heartbeat_group_attrs,
+        .ct_owner       = THIS_MODULE,
+};
+
+/* this is just here to avoid touching group in heartbeat.h which the
+ * entire damn world #includes */
+struct config_group *o2hb_alloc_hb_set(void)
+{
+        struct o2hb_heartbeat_group *hs = NULL;
+        struct config_group *ret = NULL;
+
+        hs = kcalloc(1, sizeof(struct o2hb_heartbeat_group), GFP_KERNEL);
+        if (hs == NULL)
+                goto out;
+
+        config_group_init_type_name(&hs->hs_group, "heartbeat",
+                                    &o2hb_heartbeat_group_type);
+
+        ret = &hs->hs_group;
+out:
+        if (ret == NULL)
+                kfree(hs);
+        return ret;
+}
+
+void o2hb_free_hb_set(struct config_group *group)
+{
+        struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group);
+        kfree(hs);
+}
+
+/* hb callback registration and issueing */
+
+static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type)
+{
+        if (type == O2HB_NUM_CB)
+                return ERR_PTR(-EINVAL);
+
+        return &o2hb_callbacks[type];
+}
+
+void o2hb_setup_callback(struct o2hb_callback_func *hc,
+                         enum o2hb_callback_type type,
+                         o2hb_cb_func *func,
+                         void *data,
+                         int priority)
+{
+        INIT_LIST_HEAD(&hc->hc_item);
+        hc->hc_func = func;
+        hc->hc_data = data;
+        hc->hc_priority = priority;
+        hc->hc_type = type;
+        hc->hc_magic = O2HB_CB_MAGIC;
+}
+EXPORT_SYMBOL_GPL(o2hb_setup_callback);
+
+int o2hb_register_callback(struct o2hb_callback_func *hc)
+{
+        struct o2hb_callback_func *tmp;
+        struct list_head *iter;
+        struct o2hb_callback *hbcall;
+        int ret;
+
+        BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
+        BUG_ON(!list_empty(&hc->hc_item));
+
+        hbcall = hbcall_from_type(hc->hc_type);
+        if (IS_ERR(hbcall)) {
+                ret = PTR_ERR(hbcall);
+                goto out;
+        }
+
+        down_write(&o2hb_callback_sem);
+
+        list_for_each(iter, &hbcall->list) {
+                tmp = list_entry(iter, struct o2hb_callback_func, hc_item);
+                if (hc->hc_priority < tmp->hc_priority) {
+                        list_add_tail(&hc->hc_item, iter);
+                        break;
+                }
+        }
+        if (list_empty(&hc->hc_item))
+                list_add_tail(&hc->hc_item, &hbcall->list);
+
+        up_write(&o2hb_callback_sem);
+        ret = 0;
+out:
+        mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n",
+             ret, __builtin_return_address(0), hc);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(o2hb_register_callback);
+
+int o2hb_unregister_callback(struct o2hb_callback_func *hc)
+{
+        BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
+
+        mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n",
+             __builtin_return_address(0), hc);
+
+        if (list_empty(&hc->hc_item))
+                return 0;
+
+        down_write(&o2hb_callback_sem);
+
+        list_del_init(&hc->hc_item);
+
+        up_write(&o2hb_callback_sem);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
+
+int o2hb_check_node_heartbeating(u8 node_num)
+{
+        unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+
+        o2hb_fill_node_map(testing_map, sizeof(testing_map));
+        if (!test_bit(node_num, testing_map)) {
+                mlog(ML_HEARTBEAT,
+                     "node (%u) does not have heartbeating enabled.\n",
+                     node_num);
+                return 0;
+        }
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating);
+
+int o2hb_check_node_heartbeating_from_callback(u8 node_num)
+{
+        unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+
+        o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
+        if (!test_bit(node_num, testing_map)) {
+                mlog(ML_HEARTBEAT,
+                     "node (%u) does not have heartbeating enabled.\n",
+                     node_num);
+                return 0;
+        }
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback);
+
+/* Makes sure our local node is configured with a node number, and is
+ * heartbeating. */
+int o2hb_check_local_node_heartbeating(void)
+{
+        u8 node_num;
+
+        /* if this node was set then we have networking */
+        node_num = o2nm_this_node();
+        if (node_num == O2NM_MAX_NODES) {
+                mlog(ML_HEARTBEAT, "this node has not been configured.\n");
+                return 0;
+        }
+
+        return o2hb_check_node_heartbeating(node_num);
+}
+EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating);
+
+/*
+ * this is just a hack until we get the plumbing which flips file systems
+ * read only and drops the hb ref instead of killing the node dead.
+ */
+void o2hb_stop_all_regions(void)
+{
+        struct o2hb_region *reg;
+
+        mlog(ML_ERROR, "stopping heartbeat on all active regions.\n");
+
+        spin_lock(&o2hb_live_lock);
+
+        list_for_each_entry(reg, &o2hb_all_regions, hr_all_item)
+                reg->hr_unclean_stop = 1;
+
+        spin_unlock(&o2hb_live_lock);
+}
+EXPORT_SYMBOL_GPL(o2hb_stop_all_regions);