#include <linux/random.h>
#include <linux/crc32.h>
#include <linux/time.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
#include "heartbeat.h"
#include "tcp.h"
static LIST_HEAD(o2hb_node_events);
static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
+#define O2HB_DEBUG_DIR "o2hb"
+#define O2HB_DEBUG_LIVENODES "livenodes"
+static struct dentry *o2hb_debug_dir;
+static struct dentry *o2hb_debug_livenodes;
+
static LIST_HEAD(o2hb_all_regions);
static struct o2hb_callback {
unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
-/* Only sets a new threshold if there are no active regions.
+/* 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
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));
+ 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);
+ mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n",
+ O2HB_MAX_WRITE_TIMEOUT_MS);
cancel_delayed_work(®->hr_write_timeout_work);
reg->hr_last_timeout_start = jiffies;
wait_for_completion(&wc->wc_io_complete);
}
-static int o2hb_bio_end_io(struct bio *bio,
- unsigned int bytes_done,
+static void o2hb_bio_end_io(struct bio *bio,
int error)
{
struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
wc->wc_error = error;
}
- if (bio->bi_size)
- return 1;
-
o2hb_bio_wait_dec(wc, 1);
bio_put(bio);
- return 0;
}
/* Setup a Bio to cover I/O against num_slots slots starting at
current_page = cs / spp;
page = reg->hr_slot_data[current_page];
- vec_len = min(PAGE_CACHE_SIZE,
+ vec_len = min(PAGE_CACHE_SIZE - vec_start,
(max_slots-cs) * (PAGE_CACHE_SIZE/spp) );
mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
"seq %llu last %llu changed %u equal %u\n",
slot->ds_node_num, (long long)slot->ds_last_generation,
le32_to_cpu(hb_block->hb_cksum),
- (unsigned long long)le64_to_cpu(hb_block->hb_seq),
+ (unsigned long long)le64_to_cpu(hb_block->hb_seq),
(unsigned long long)slot->ds_last_time, slot->ds_changed_samples,
slot->ds_equal_samples);
while (!kthread_should_stop() && !reg->hr_unclean_stop) {
/* We track the time spent inside
- * o2hb_do_disk_heartbeat so that we avoid more then
+ * o2hb_do_disk_heartbeat so that we avoid more than
* 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(&after_hb);
elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb);
- mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
+ mlog(ML_HEARTBEAT,
+ "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
before_hb.tv_sec, (unsigned long) before_hb.tv_usec,
after_hb.tv_sec, (unsigned long) after_hb.tv_usec,
elapsed_msec);
return 0;
}
-void o2hb_init(void)
+#ifdef CONFIG_DEBUG_FS
+static int o2hb_debug_open(struct inode *inode, struct file *file)
+{
+ unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ char *buf = NULL;
+ int i = -1;
+ int out = 0;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ goto bail;
+
+ o2hb_fill_node_map(map, sizeof(map));
+
+ while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
+ out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+ out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+
+ i_size_write(inode, out);
+
+ file->private_data = buf;
+
+ return 0;
+bail:
+ return -ENOMEM;
+}
+
+static int o2hb_debug_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+ i_size_read(file->f_mapping->host));
+}
+#else
+static int o2hb_debug_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+static int o2hb_debug_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static const struct file_operations o2hb_debug_fops = {
+ .open = o2hb_debug_open,
+ .release = o2hb_debug_release,
+ .read = o2hb_debug_read,
+ .llseek = generic_file_llseek,
+};
+
+void o2hb_exit(void)
+{
+ if (o2hb_debug_livenodes)
+ debugfs_remove(o2hb_debug_livenodes);
+ if (o2hb_debug_dir)
+ debugfs_remove(o2hb_debug_dir);
+}
+
+int o2hb_init(void)
{
int i;
INIT_LIST_HEAD(&o2hb_node_events);
memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
+
+ o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
+ if (!o2hb_debug_dir) {
+ mlog_errno(-ENOMEM);
+ return -ENOMEM;
+ }
+
+ o2hb_debug_livenodes = debugfs_create_file(O2HB_DEBUG_LIVENODES,
+ S_IFREG|S_IRUSR,
+ o2hb_debug_dir, NULL,
+ &o2hb_debug_fops);
+ if (!o2hb_debug_livenodes) {
+ mlog_errno(-ENOMEM);
+ debugfs_remove(o2hb_debug_dir);
+ return -ENOMEM;
+ }
+
+ return 0;
}
/* if we're already in a callback then we're already serialized by the sem */
}
if (reg->hr_bdev)
- blkdev_put(reg->hr_bdev);
+ blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
if (reg->hr_slots)
kfree(reg->hr_slots);
goto out;
reg->hr_bdev = I_BDEV(filp->f_mapping->host);
- ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, 0);
+ ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ);
if (ret) {
reg->hr_bdev = NULL;
goto out;
bdevname(reg->hr_bdev, reg->hr_dev_name);
- sectsize = bdev_hardsect_size(reg->hr_bdev);
+ sectsize = bdev_logical_block_size(reg->hr_bdev);
if (sectsize != reg->hr_block_bytes) {
mlog(ML_ERROR,
"blocksize %u incorrect for device, expected %d",
ret = wait_event_interruptible(o2hb_steady_queue,
atomic_read(®->hr_steady_iterations) == 0);
if (ret) {
+ /* We got interrupted (hello ptrace!). Clean up */
spin_lock(&o2hb_live_lock);
hb_task = reg->hr_task;
reg->hr_task = NULL;
goto out;
}
- ret = count;
+ /* Ok, we were woken. Make sure it wasn't by drop_item() */
+ spin_lock(&o2hb_live_lock);
+ hb_task = reg->hr_task;
+ spin_unlock(&o2hb_live_lock);
+
+ if (hb_task)
+ ret = count;
+ else
+ ret = -EIO;
+
out:
if (filp)
fput(filp);
iput(inode);
if (ret < 0) {
if (reg->hr_bdev) {
- blkdev_put(reg->hr_bdev);
+ blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
reg->hr_bdev = NULL;
}
}
spin_lock(&o2hb_live_lock);
if (reg->hr_task)
- pid = reg->hr_task->pid;
+ pid = task_pid_nr(reg->hr_task);
spin_unlock(&o2hb_live_lock);
if (!pid)
const char *name)
{
struct o2hb_region *reg = NULL;
- struct config_item *ret = NULL;
reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
if (reg == NULL)
- goto out; /* ENOMEM */
+ return ERR_PTR(-ENOMEM);
config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
- ret = ®->hr_item;
-
spin_lock(&o2hb_live_lock);
list_add_tail(®->hr_all_item, &o2hb_all_regions);
spin_unlock(&o2hb_live_lock);
-out:
- if (ret == NULL)
- kfree(reg);
- return ret;
+ return ®->hr_item;
}
static void o2hb_heartbeat_group_drop_item(struct config_group *group,
if (hb_task)
kthread_stop(hb_task);
+ /*
+ * If we're racing a dev_write(), we need to wake them. They will
+ * check reg->hr_task
+ */
+ if (atomic_read(®->hr_steady_iterations) != 0) {
+ atomic_set(®->hr_steady_iterations, 0);
+ wake_up(&o2hb_steady_queue);
+ }
+
config_item_put(item);
}
ret = -ENOENT;
spin_unlock(&o2hb_live_lock);
- if (!ret)
- ret = o2nm_depend_item(®->hr_item);
+ if (ret)
+ goto out;
+
+ ret = o2nm_depend_this_node();
+ if (ret)
+ goto out;
+
+ ret = o2nm_depend_item(®->hr_item);
+ if (ret)
+ o2nm_undepend_this_node();
+out:
return ret;
}
spin_unlock(&o2hb_live_lock);
- if (reg)
+ if (reg) {
o2nm_undepend_item(®->hr_item);
+ o2nm_undepend_this_node();
+ }
}
int o2hb_register_callback(const char *region_uuid,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff