text: #include <linux/ceph/ceph_debug.h>
  
  #include <linux/device.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/ctype.h>
  #include <linux/debugfs.h>
  #include <linux/seq_file.h>
  
  #include <linux/ceph/libceph.h>
  #include <linux/ceph/mon_client.h>
  #include <linux/ceph/auth.h>
  #include <linux/ceph/debugfs.h>
  
  #ifdef CONFIG_DEBUG_FS
  
  /*
   * Implement /sys/kernel/debug/ceph fun
   *
   * /sys/kernel/debug/ceph/client*  - an instance of the ceph client
   *      .../osdmap      - current osdmap
   *      .../monmap      - current monmap
   *      .../osdc        - active osd requests
   *      .../monc        - mon client state
   *      .../dentry_lru  - dump contents of dentry lru
   *      .../caps        - expose cap (reservation) stats
   *      .../bdi         - symlink to ../../bdi/something
   */
  
  static struct dentry *ceph_debugfs_dir;
  
  static int monmap_show(struct seq_file *s, void *p)
  {
  	int i;
  	struct ceph_client *client = s->private;
  
  	if (client->monc.monmap == NULL)
  		return 0;
  
  	seq_printf(s, "epoch %d\n", client->monc.monmap->epoch);
  	for (i = 0; i < client->monc.monmap->num_mon; i++) {
  		struct ceph_entity_inst *inst =
  			&client->monc.monmap->mon_inst[i];
  
  		seq_printf(s, "\t%s%lld\t%s\n",
  			   ENTITY_NAME(inst->name),
  			   ceph_pr_addr(&inst->addr.in_addr));
  	}
  	return 0;
  }
  
  static int osdmap_show(struct seq_file *s, void *p)
  {
  	int i;
  	struct ceph_client *client = s->private;
  	struct ceph_osdmap *map = client->osdc.osdmap;
  	struct rb_node *n;
  
  	if (map == NULL)
  		return 0;
  
  	seq_printf(s, "epoch %d\n", map->epoch);
  	seq_printf(s, "flags%s%s\n",
  		   (map->flags & CEPH_OSDMAP_NEARFULL) ?  " NEARFULL" : "",
  		   (map->flags & CEPH_OSDMAP_FULL) ?  " FULL" : "");
  
  	for (n = rb_first(&map->pg_pools); n; n = rb_next(n)) {
  		struct ceph_pg_pool_info *pool =
  			rb_entry(n, struct ceph_pg_pool_info, node);
  
  		seq_printf(s, "pool %lld pg_num %u (%d) read_tier %lld write_tier %lld\n",
  			   pool->id, pool->pg_num, pool->pg_num_mask,
  			   pool->read_tier, pool->write_tier);
  	}
  	for (i = 0; i < map->max_osd; i++) {
  		struct ceph_entity_addr *addr = &map->osd_addr[i];
  		int state = map->osd_state[i];
  		char sb[64];
  
  		seq_printf(s, "osd%d\t%s\t%3d%%\t(%s)\t%3d%%\n",
  			   i, ceph_pr_addr(&addr->in_addr),
  			   ((map->osd_weight[i]*100) >> 16),
  			   ceph_osdmap_state_str(sb, sizeof(sb), state),
  			   ((ceph_get_primary_affinity(map, i)*100) >> 16));
  	}
  	for (n = rb_first(&map->pg_temp); n; n = rb_next(n)) {
  		struct ceph_pg_mapping *pg =
  			rb_entry(n, struct ceph_pg_mapping, node);
  
  		seq_printf(s, "pg_temp %llu.%x [", pg->pgid.pool,
  			   pg->pgid.seed);
  		for (i = 0; i < pg->pg_temp.len; i++)
  			seq_printf(s, "%s%d", (i == 0 ? "" : ","),
  				   pg->pg_temp.osds[i]);
  		seq_printf(s, "]\n");
  	}
  	for (n = rb_first(&map->primary_temp); n; n = rb_next(n)) {
  		struct ceph_pg_mapping *pg =
  			rb_entry(n, struct ceph_pg_mapping, node);
  
  		seq_printf(s, "primary_temp %llu.%x %d\n", pg->pgid.pool,
  			   pg->pgid.seed, pg->primary_temp.osd);
  	}
  
  	return 0;
  }
  
  static int monc_show(struct seq_file *s, void *p)
  {
  	struct ceph_client *client = s->private;
  	struct ceph_mon_generic_request *req;
  	struct ceph_mon_client *monc = &client->monc;
  	struct rb_node *rp;
  
  	mutex_lock(&monc->mutex);
  
  	if (monc->have_mdsmap)
  		seq_printf(s, "have mdsmap %u\n", (unsigned int)monc->have_mdsmap);
  	if (monc->have_osdmap)
  		seq_printf(s, "have osdmap %u\n", (unsigned int)monc->have_osdmap);
  	if (monc->want_next_osdmap)
  		seq_printf(s, "want next osdmap\n");
  
  	for (rp = rb_first(&monc->generic_request_tree); rp; rp = rb_next(rp)) {
  		__u16 op;
  		req = rb_entry(rp, struct ceph_mon_generic_request, node);
  		op = le16_to_cpu(req->request->hdr.type);
  		if (op == CEPH_MSG_STATFS)
  			seq_printf(s, "%llu statfs\n", req->tid);
  		else if (op == CEPH_MSG_POOLOP)
  			seq_printf(s, "%llu poolop\n", req->tid);
  		else if (op == CEPH_MSG_MON_GET_VERSION)
  			seq_printf(s, "%llu mon_get_version", req->tid);
  		else
  			seq_printf(s, "%llu unknown\n", req->tid);
  	}
  
  	mutex_unlock(&monc->mutex);
  	return 0;
  }
  
  static int osdc_show(struct seq_file *s, void *pp)
  {
  	struct ceph_client *client = s->private;
  	struct ceph_osd_client *osdc = &client->osdc;
  	struct rb_node *p;
  
  	mutex_lock(&osdc->request_mutex);
  	for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
  		struct ceph_osd_request *req;
  		unsigned int i;
  		int opcode;
  
  		req = rb_entry(p, struct ceph_osd_request, r_node);
  
  		seq_printf(s, "%lld\tosd%d\t%lld.%x\t", req->r_tid,
  			   req->r_osd ? req->r_osd->o_osd : -1,
  			   req->r_pgid.pool, req->r_pgid.seed);
  
  		seq_printf(s, "%.*s", req->r_base_oid.name_len,
  			   req->r_base_oid.name);
  
  		if (req->r_reassert_version.epoch)
  			seq_printf(s, "\t%u'%llu",
  			   (unsigned int)le32_to_cpu(req->r_reassert_version.epoch),
  			   le64_to_cpu(req->r_reassert_version.version));
  		else
  			seq_printf(s, "\t");
  
  		for (i = 0; i < req->r_num_ops; i++) {
  			opcode = req->r_ops[i].op;
  			seq_printf(s, "\t%s", ceph_osd_op_name(opcode));
  		}
  
  		seq_printf(s, "\n");
  	}
  	mutex_unlock(&osdc->request_mutex);
  	return 0;
  }
  
  CEPH_DEFINE_SHOW_FUNC(monmap_show)
  CEPH_DEFINE_SHOW_FUNC(osdmap_show)
  CEPH_DEFINE_SHOW_FUNC(monc_show)
  CEPH_DEFINE_SHOW_FUNC(osdc_show)
  
  int ceph_debugfs_init(void)
  {
  	ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
  	if (!ceph_debugfs_dir)
  		return -ENOMEM;
  	return 0;
  }
  
  void ceph_debugfs_cleanup(void)
  {
  	debugfs_remove(ceph_debugfs_dir);
  }
  
  int ceph_debugfs_client_init(struct ceph_client *client)
  {
  	int ret = -ENOMEM;
  	char name[80];
  
  	snprintf(name, sizeof(name), "%pU.client%lld", &client->fsid,
  		 client->monc.auth->global_id);
  
  	dout("ceph_debugfs_client_init %p %s\n", client, name);
  
  	BUG_ON(client->debugfs_dir);
  	client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
  	if (!client->debugfs_dir)
  		goto out;
  
  	client->monc.debugfs_file = debugfs_create_file("monc",
  						      0600,
  						      client->debugfs_dir,
  						      client,
  						      &monc_show_fops);
  	if (!client->monc.debugfs_file)
  		goto out;
  
  	client->osdc.debugfs_file = debugfs_create_file("osdc",
  						      0600,
  						      client->debugfs_dir,
  						      client,
  						      &osdc_show_fops);
  	if (!client->osdc.debugfs_file)
  		goto out;
  
  	client->debugfs_monmap = debugfs_create_file("monmap",
  					0600,
  					client->debugfs_dir,
  					client,
  					&monmap_show_fops);
  	if (!client->debugfs_monmap)
  		goto out;
  
  	client->debugfs_osdmap = debugfs_create_file("osdmap",
  					0600,
  					client->debugfs_dir,
  					client,
  					&osdmap_show_fops);
  	if (!client->debugfs_osdmap)
  		goto out;
  
  	return 0;
  
  out:
  	ceph_debugfs_client_cleanup(client);
  	return ret;
  }
  
  void ceph_debugfs_client_cleanup(struct ceph_client *client)
  {
  	dout("ceph_debugfs_client_cleanup %p\n", client);
  	debugfs_remove(client->debugfs_osdmap);
  	debugfs_remove(client->debugfs_monmap);
  	debugfs_remove(client->osdc.debugfs_file);
  	debugfs_remove(client->monc.debugfs_file);
  	debugfs_remove(client->debugfs_dir);
  }
  
  #else  /* CONFIG_DEBUG_FS */
  
  int ceph_debugfs_init(void)
  {
  	return 0;
  }
  
  void ceph_debugfs_cleanup(void)
  {
  }
  
  int ceph_debugfs_client_init(struct ceph_client *client)
  {
  	return 0;
  }
  
  void ceph_debugfs_client_cleanup(struct ceph_client *client)
  {
  }
  
  #endif  /* CONFIG_DEBUG_FS */
  
  EXPORT_SYMBOL(ceph_debugfs_init);
  EXPORT_SYMBOL(ceph_debugfs_cleanup);
  