fs/ceph/debugfs.c - kernel/msm-4.9 - Gitiles

 #include "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 "super.h"
 #include "mds_client.h"
 #include "mon_client.h"
 #include "auth.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
  *      .../mdsmap      - current mdsmap
  *      .../monmap      - current monmap
  *      .../osdc        - active osd requests
  *      .../mdsc        - active mds 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),
 			   pr_addr(&inst->addr.in_addr));
 	}
 	return 0;
 }

 static int mdsmap_show(struct seq_file *s, void *p)
 {
 	int i;
 	struct ceph_client *client = s->private;

 	if (client->mdsc.mdsmap == NULL)
 		return 0;
 	seq_printf(s, "epoch %d\n", client->mdsc.mdsmap->m_epoch);
 	seq_printf(s, "root %d\n", client->mdsc.mdsmap->m_root);
 	seq_printf(s, "session_timeout %d\n",
 		       client->mdsc.mdsmap->m_session_timeout);
 	seq_printf(s, "session_autoclose %d\n",
 		       client->mdsc.mdsmap->m_session_autoclose);
 	for (i = 0; i < client->mdsc.mdsmap->m_max_mds; i++) {
 		struct ceph_entity_addr *addr =
 			&client->mdsc.mdsmap->m_info[i].addr;
 		int state = client->mdsc.mdsmap->m_info[i].state;

 		seq_printf(s, "\tmds%d\t%s\t(%s)\n", i, pr_addr(&addr->in_addr),
 			       ceph_mds_state_name(state));
 	}
 	return 0;
 }

 static int osdmap_show(struct seq_file *s, void *p)
 {
 	int i;
 	struct ceph_client *client = s->private;
 	struct rb_node *n;

 	if (client->osdc.osdmap == NULL)
 		return 0;
 	seq_printf(s, "epoch %d\n", client->osdc.osdmap->epoch);
 	seq_printf(s, "flags%s%s\n",
 		   (client->osdc.osdmap->flags & CEPH_OSDMAP_NEARFULL) ?
 		   " NEARFULL" : "",
 		   (client->osdc.osdmap->flags & CEPH_OSDMAP_FULL) ?
 		   " FULL" : "");
 	for (n = rb_first(&client->osdc.osdmap->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, "pg_pool %d pg_num %d / %d, lpg_num %d / %d\n",
 			   pool->id, pool->v.pg_num, pool->pg_num_mask,
 			   pool->v.lpg_num, pool->lpg_num_mask);
 	}
 	for (i = 0; i < client->osdc.osdmap->max_osd; i++) {
 		struct ceph_entity_addr *addr =
 			&client->osdc.osdmap->osd_addr[i];
 		int state = client->osdc.osdmap->osd_state[i];
 		char sb[64];

 		seq_printf(s, "\tosd%d\t%s\t%3d%%\t(%s)\n",
 			   i, pr_addr(&addr->in_addr),
 			   ((client->osdc.osdmap->osd_weight[i]*100) >> 16),
 			   ceph_osdmap_state_str(sb, sizeof(sb), state));
 	}
 	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)monc->have_mdsmap);
 	if (monc->have_osdmap)
 		seq_printf(s, "have osdmap %u\n", (unsigned)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, "%lld statfs\n", req->tid);
 		else
 			seq_printf(s, "%lld unknown\n", req->tid);
 	}

 	mutex_unlock(&monc->mutex);
 	return 0;
 }

 static int mdsc_show(struct seq_file *s, void *p)
 {
 	struct ceph_client *client = s->private;
 	struct ceph_mds_client *mdsc = &client->mdsc;
 	struct ceph_mds_request *req;
 	struct rb_node *rp;
 	int pathlen;
 	u64 pathbase;
 	char *path;

 	mutex_lock(&mdsc->mutex);
 	for (rp = rb_first(&mdsc->request_tree); rp; rp = rb_next(rp)) {
 		req = rb_entry(rp, struct ceph_mds_request, r_node);

 		if (req->r_request)
 			seq_printf(s, "%lld\tmds%d\t", req->r_tid, req->r_mds);
 		else
 			seq_printf(s, "%lld\t(no request)\t", req->r_tid);

 		seq_printf(s, "%s", ceph_mds_op_name(req->r_op));

 		if (req->r_got_unsafe)
 			seq_printf(s, "\t(unsafe)");
 		else
 			seq_printf(s, "\t");

 		if (req->r_inode) {
 			seq_printf(s, " #%llx", ceph_ino(req->r_inode));
 		} else if (req->r_dentry) {
 			path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
 						    &pathbase, 0);
 			if (IS_ERR(path))
 				path = NULL;
 			spin_lock(&req->r_dentry->d_lock);
 			seq_printf(s, " #%llx/%.*s (%s)",
 				   ceph_ino(req->r_dentry->d_parent->d_inode),
 				   req->r_dentry->d_name.len,
 				   req->r_dentry->d_name.name,
 				   path ? path : "");
 			spin_unlock(&req->r_dentry->d_lock);
 			kfree(path);
 		} else if (req->r_path1) {
 			seq_printf(s, " #%llx/%s", req->r_ino1.ino,
 				   req->r_path1);
 		}

 		if (req->r_old_dentry) {
 			path = ceph_mdsc_build_path(req->r_old_dentry, &pathlen,
 						    &pathbase, 0);
 			if (IS_ERR(path))
 				path = NULL;
 			spin_lock(&req->r_old_dentry->d_lock);
 			seq_printf(s, " #%llx/%.*s (%s)",
 			   ceph_ino(req->r_old_dentry->d_parent->d_inode),
 				   req->r_old_dentry->d_name.len,
 				   req->r_old_dentry->d_name.name,
 				   path ? path : "");
 			spin_unlock(&req->r_old_dentry->d_lock);
 			kfree(path);
 		} else if (req->r_path2) {
 			if (req->r_ino2.ino)
 				seq_printf(s, " #%llx/%s", req->r_ino2.ino,
 					   req->r_path2);
 			else
 				seq_printf(s, " %s", req->r_path2);
 		}

 		seq_printf(s, "\n");
 	}
 	mutex_unlock(&mdsc->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;
 		struct ceph_osd_request_head *head;
 		struct ceph_osd_op *op;
 		int num_ops;
 		int opcode, olen;
 		int i;

 		req = rb_entry(p, struct ceph_osd_request, r_node);

 		seq_printf(s, "%lld\tosd%d\t%d.%x\t", req->r_tid,
 			   req->r_osd ? req->r_osd->o_osd : -1,
 			   le32_to_cpu(req->r_pgid.pool),
 			   le16_to_cpu(req->r_pgid.ps));

 		head = req->r_request->front.iov_base;
 		op = (void *)(head + 1);

 		num_ops = le16_to_cpu(head->num_ops);
 		olen = le32_to_cpu(head->object_len);
 		seq_printf(s, "%.*s", olen,
 			   (const char *)(head->ops + num_ops));

 		if (req->r_reassert_version.epoch)
 			seq_printf(s, "\t%u'%llu",
 			   (unsigned)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 < num_ops; i++) {
 			opcode = le16_to_cpu(op->op);
 			seq_printf(s, "\t%s", ceph_osd_op_name(opcode));
 			op++;
 		}

 		seq_printf(s, "\n");
 	}
 	mutex_unlock(&osdc->request_mutex);
 	return 0;
 }

 static int caps_show(struct seq_file *s, void *p)
 {
 	struct ceph_client *client = s->private;
 	int total, avail, used, reserved, min;

 	ceph_reservation_status(client, &total, &avail, &used, &reserved, &min);
 	seq_printf(s, "total\t\t%d\n"
 		   "avail\t\t%d\n"
 		   "used\t\t%d\n"
 		   "reserved\t%d\n"
 		   "min\t%d\n",
 		   total, avail, used, reserved, min);
 	return 0;
 }

 static int dentry_lru_show(struct seq_file *s, void *ptr)
 {
 	struct ceph_client *client = s->private;
 	struct ceph_mds_client *mdsc = &client->mdsc;
 	struct ceph_dentry_info *di;

 	spin_lock(&mdsc->dentry_lru_lock);
 	list_for_each_entry(di, &mdsc->dentry_lru, lru) {
 		struct dentry *dentry = di->dentry;
 		seq_printf(s, "%p %p\t%.*s\n",
 			   di, dentry, dentry->d_name.len, dentry->d_name.name);
 	}
 	spin_unlock(&mdsc->dentry_lru_lock);

 	return 0;
 }

 #define DEFINE_SHOW_FUNC(name)						\
 static int name##_open(struct inode *inode, struct file *file)		\
 {									\
 	struct seq_file *sf;						\
 	int ret;							\
 									\
 	ret = single_open(file, name, NULL);				\
 	sf = file->private_data;					\
 	sf->private = inode->i_private;					\
 	return ret;							\
 }									\
 									\
 static const struct file_operations name##_fops = {			\
 	.open		= name##_open,					\
 	.read		= seq_read,					\
 	.llseek		= seq_lseek,					\
 	.release	= single_release,				\
 };

 DEFINE_SHOW_FUNC(monmap_show)
 DEFINE_SHOW_FUNC(mdsmap_show)
 DEFINE_SHOW_FUNC(osdmap_show)
 DEFINE_SHOW_FUNC(monc_show)
 DEFINE_SHOW_FUNC(mdsc_show)
 DEFINE_SHOW_FUNC(osdc_show)
 DEFINE_SHOW_FUNC(dentry_lru_show)
 DEFINE_SHOW_FUNC(caps_show)

 static int congestion_kb_set(void *data, u64 val)
 {
 	struct ceph_client *client = (struct ceph_client *)data;

 	if (client)
 		client->mount_args->congestion_kb = (int)val;

 	return 0;
 }

 static int congestion_kb_get(void *data, u64 *val)
 {
 	struct ceph_client *client = (struct ceph_client *)data;

 	if (client)
 		*val = (u64)client->mount_args->congestion_kb;

 	return 0;
 }


 DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
 			congestion_kb_set, "%llu\n");

 int __init 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 = 0;
 	char name[80];

 	snprintf(name, sizeof(name), "%pU.client%lld", &client->fsid,
 		 client->monc.auth->global_id);

 	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->mdsc.debugfs_file = debugfs_create_file("mdsc",
 						      0600,
 						      client->debugfs_dir,
 						      client,
 						      &mdsc_show_fops);
 	if (!client->mdsc.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_mdsmap = debugfs_create_file("mdsmap",
 					0600,
 					client->debugfs_dir,
 					client,
 					&mdsmap_show_fops);
 	if (!client->debugfs_mdsmap)
 		goto out;

 	client->debugfs_osdmap = debugfs_create_file("osdmap",
 					0600,
 					client->debugfs_dir,
 					client,
 					&osdmap_show_fops);
 	if (!client->debugfs_osdmap)
 		goto out;

 	client->debugfs_dentry_lru = debugfs_create_file("dentry_lru",
 					0600,
 					client->debugfs_dir,
 					client,
 					&dentry_lru_show_fops);
 	if (!client->debugfs_dentry_lru)
 		goto out;

 	client->debugfs_caps = debugfs_create_file("caps",
 						   0400,
 						   client->debugfs_dir,
 						   client,
 						   &caps_show_fops);
 	if (!client->debugfs_caps)
 		goto out;

 	client->debugfs_congestion_kb =
 		debugfs_create_file("writeback_congestion_kb",
 				    0600,
 				    client->debugfs_dir,
 				    client,
 				    &congestion_kb_fops);
 	if (!client->debugfs_congestion_kb)
 		goto out;

 	sprintf(name, "../../bdi/%s", dev_name(client->sb->s_bdi->dev));
 	client->debugfs_bdi = debugfs_create_symlink("bdi", client->debugfs_dir,
 						     name);

 	return 0;

 out:
 	ceph_debugfs_client_cleanup(client);
 	return ret;
 }

 void ceph_debugfs_client_cleanup(struct ceph_client *client)
 {
 	debugfs_remove(client->debugfs_bdi);
 	debugfs_remove(client->debugfs_caps);
 	debugfs_remove(client->debugfs_dentry_lru);
 	debugfs_remove(client->debugfs_osdmap);
 	debugfs_remove(client->debugfs_mdsmap);
 	debugfs_remove(client->debugfs_monmap);
 	debugfs_remove(client->osdc.debugfs_file);
 	debugfs_remove(client->mdsc.debugfs_file);
 	debugfs_remove(client->monc.debugfs_file);
 	debugfs_remove(client->debugfs_congestion_kb);
 	debugfs_remove(client->debugfs_dir);
 }

 #else  /* CONFIG_DEBUG_FS */

 int __init 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 */
	#include "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 "super.h"
	#include "mds_client.h"
	#include "mon_client.h"
	#include "auth.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
	* .../mdsmap - current mdsmap
	* .../monmap - current monmap
	* .../osdc - active osd requests
	* .../mdsc - active mds 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),
	pr_addr(&inst->addr.in_addr));
	}
	return 0;
	}

	static int mdsmap_show(struct seq_file s, void p)
	{
	int i;
	struct ceph_client *client = s->private;

	if (client->mdsc.mdsmap == NULL)
	return 0;
	seq_printf(s, "epoch %d\n", client->mdsc.mdsmap->m_epoch);
	seq_printf(s, "root %d\n", client->mdsc.mdsmap->m_root);
	seq_printf(s, "session_timeout %d\n",
	client->mdsc.mdsmap->m_session_timeout);
	seq_printf(s, "session_autoclose %d\n",
	client->mdsc.mdsmap->m_session_autoclose);
	for (i = 0; i < client->mdsc.mdsmap->m_max_mds; i++) {
	struct ceph_entity_addr *addr =
	&client->mdsc.mdsmap->m_info[i].addr;
	int state = client->mdsc.mdsmap->m_info[i].state;

	seq_printf(s, "\tmds%d\t%s\t(%s)\n", i, pr_addr(&addr->in_addr),
	ceph_mds_state_name(state));
	}
	return 0;
	}

	static int osdmap_show(struct seq_file s, void p)
	{
	int i;
	struct ceph_client *client = s->private;
	struct rb_node *n;

	if (client->osdc.osdmap == NULL)
	return 0;
	seq_printf(s, "epoch %d\n", client->osdc.osdmap->epoch);
	seq_printf(s, "flags%s%s\n",
	(client->osdc.osdmap->flags & CEPH_OSDMAP_NEARFULL) ?
	" NEARFULL" : "",
	(client->osdc.osdmap->flags & CEPH_OSDMAP_FULL) ?
	" FULL" : "");
	for (n = rb_first(&client->osdc.osdmap->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, "pg_pool %d pg_num %d / %d, lpg_num %d / %d\n",
	pool->id, pool->v.pg_num, pool->pg_num_mask,
	pool->v.lpg_num, pool->lpg_num_mask);
	}
	for (i = 0; i < client->osdc.osdmap->max_osd; i++) {
	struct ceph_entity_addr *addr =
	&client->osdc.osdmap->osd_addr[i];
	int state = client->osdc.osdmap->osd_state[i];
	char sb[64];

	seq_printf(s, "\tosd%d\t%s\t%3d%%\t(%s)\n",
	i, pr_addr(&addr->in_addr),
	((client->osdc.osdmap->osd_weight[i]*100) >> 16),
	ceph_osdmap_state_str(sb, sizeof(sb), state));
	}
	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)monc->have_mdsmap);
	if (monc->have_osdmap)
	seq_printf(s, "have osdmap %u\n", (unsigned)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, "%lld statfs\n", req->tid);
	else
	seq_printf(s, "%lld unknown\n", req->tid);
	}

	mutex_unlock(&monc->mutex);
	return 0;
	}

	static int mdsc_show(struct seq_file s, void p)
	{
	struct ceph_client *client = s->private;
	struct ceph_mds_client *mdsc = &client->mdsc;
	struct ceph_mds_request *req;
	struct rb_node *rp;
	int pathlen;
	u64 pathbase;
	char *path;

	mutex_lock(&mdsc->mutex);
	for (rp = rb_first(&mdsc->request_tree); rp; rp = rb_next(rp)) {
	req = rb_entry(rp, struct ceph_mds_request, r_node);

	if (req->r_request)
	seq_printf(s, "%lld\tmds%d\t", req->r_tid, req->r_mds);
	else
	seq_printf(s, "%lld\t(no request)\t", req->r_tid);

	seq_printf(s, "%s", ceph_mds_op_name(req->r_op));

	if (req->r_got_unsafe)
	seq_printf(s, "\t(unsafe)");
	else
	seq_printf(s, "\t");

	if (req->r_inode) {
	seq_printf(s, " #%llx", ceph_ino(req->r_inode));
	} else if (req->r_dentry) {
	path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
	&pathbase, 0);
	if (IS_ERR(path))
	path = NULL;
	spin_lock(&req->r_dentry->d_lock);
	seq_printf(s, " #%llx/%.*s (%s)",
	ceph_ino(req->r_dentry->d_parent->d_inode),
	req->r_dentry->d_name.len,
	req->r_dentry->d_name.name,
	path ? path : "");
	spin_unlock(&req->r_dentry->d_lock);
	kfree(path);
	} else if (req->r_path1) {
	seq_printf(s, " #%llx/%s", req->r_ino1.ino,
	req->r_path1);
	}

	if (req->r_old_dentry) {
	path = ceph_mdsc_build_path(req->r_old_dentry, &pathlen,
	&pathbase, 0);
	if (IS_ERR(path))
	path = NULL;
	spin_lock(&req->r_old_dentry->d_lock);
	seq_printf(s, " #%llx/%.*s (%s)",
	ceph_ino(req->r_old_dentry->d_parent->d_inode),
	req->r_old_dentry->d_name.len,
	req->r_old_dentry->d_name.name,
	path ? path : "");
	spin_unlock(&req->r_old_dentry->d_lock);
	kfree(path);
	} else if (req->r_path2) {
	if (req->r_ino2.ino)
	seq_printf(s, " #%llx/%s", req->r_ino2.ino,
	req->r_path2);
	else
	seq_printf(s, " %s", req->r_path2);
	}

	seq_printf(s, "\n");
	}
	mutex_unlock(&mdsc->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;
	struct ceph_osd_request_head *head;
	struct ceph_osd_op *op;
	int num_ops;
	int opcode, olen;
	int i;

	req = rb_entry(p, struct ceph_osd_request, r_node);

	seq_printf(s, "%lld\tosd%d\t%d.%x\t", req->r_tid,
	req->r_osd ? req->r_osd->o_osd : -1,
	le32_to_cpu(req->r_pgid.pool),
	le16_to_cpu(req->r_pgid.ps));

	head = req->r_request->front.iov_base;
	op = (void *)(head + 1);

	num_ops = le16_to_cpu(head->num_ops);
	olen = le32_to_cpu(head->object_len);
	seq_printf(s, "%.*s", olen,
	(const char *)(head->ops + num_ops));

	if (req->r_reassert_version.epoch)
	seq_printf(s, "\t%u'%llu",
	(unsigned)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 < num_ops; i++) {
	opcode = le16_to_cpu(op->op);
	seq_printf(s, "\t%s", ceph_osd_op_name(opcode));
	op++;
	}

	seq_printf(s, "\n");
	}
	mutex_unlock(&osdc->request_mutex);
	return 0;
	}

	static int caps_show(struct seq_file s, void p)
	{
	struct ceph_client *client = s->private;
	int total, avail, used, reserved, min;

	ceph_reservation_status(client, &total, &avail, &used, &reserved, &min);
	seq_printf(s, "total\t\t%d\n"
	"avail\t\t%d\n"
	"used\t\t%d\n"
	"reserved\t%d\n"
	"min\t%d\n",
	total, avail, used, reserved, min);
	return 0;
	}

	static int dentry_lru_show(struct seq_file s, void ptr)
	{
	struct ceph_client *client = s->private;
	struct ceph_mds_client *mdsc = &client->mdsc;
	struct ceph_dentry_info *di;

	spin_lock(&mdsc->dentry_lru_lock);
	list_for_each_entry(di, &mdsc->dentry_lru, lru) {
	struct dentry *dentry = di->dentry;
	seq_printf(s, "%p %p\t%.*s\n",
	di, dentry, dentry->d_name.len, dentry->d_name.name);
	}
	spin_unlock(&mdsc->dentry_lru_lock);

	return 0;
	}

	#define DEFINE_SHOW_FUNC(name) \
	static int name##_open(struct inode inode, struct file file) \
	{ \
	struct seq_file *sf; \
	int ret; \
	\
	ret = single_open(file, name, NULL); \
	sf = file->private_data; \
	sf->private = inode->i_private; \
	return ret; \
	} \
	\
	static const struct file_operations name##_fops = { \
	.open = name##_open, \
	.read = seq_read, \
	.llseek = seq_lseek, \
	.release = single_release, \
	};

	DEFINE_SHOW_FUNC(monmap_show)
	DEFINE_SHOW_FUNC(mdsmap_show)
	DEFINE_SHOW_FUNC(osdmap_show)
	DEFINE_SHOW_FUNC(monc_show)
	DEFINE_SHOW_FUNC(mdsc_show)
	DEFINE_SHOW_FUNC(osdc_show)
	DEFINE_SHOW_FUNC(dentry_lru_show)
	DEFINE_SHOW_FUNC(caps_show)

	static int congestion_kb_set(void *data, u64 val)
	{
	struct ceph_client client = (struct ceph_client )data;

	if (client)
	client->mount_args->congestion_kb = (int)val;

	return 0;
	}

	static int congestion_kb_get(void data, u64 val)
	{
	struct ceph_client client = (struct ceph_client )data;

	if (client)
	*val = (u64)client->mount_args->congestion_kb;

	return 0;
	}


	DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
	congestion_kb_set, "%llu\n");

	int __init 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 = 0;
	char name[80];

	snprintf(name, sizeof(name), "%pU.client%lld", &client->fsid,
	client->monc.auth->global_id);

	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->mdsc.debugfs_file = debugfs_create_file("mdsc",
	0600,
	client->debugfs_dir,
	client,
	&mdsc_show_fops);
	if (!client->mdsc.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_mdsmap = debugfs_create_file("mdsmap",
	0600,
	client->debugfs_dir,
	client,
	&mdsmap_show_fops);
	if (!client->debugfs_mdsmap)
	goto out;

	client->debugfs_osdmap = debugfs_create_file("osdmap",
	0600,
	client->debugfs_dir,
	client,
	&osdmap_show_fops);
	if (!client->debugfs_osdmap)
	goto out;

	client->debugfs_dentry_lru = debugfs_create_file("dentry_lru",
	0600,
	client->debugfs_dir,
	client,
	&dentry_lru_show_fops);
	if (!client->debugfs_dentry_lru)
	goto out;

	client->debugfs_caps = debugfs_create_file("caps",
	0400,
	client->debugfs_dir,
	client,
	&caps_show_fops);
	if (!client->debugfs_caps)
	goto out;

	client->debugfs_congestion_kb =
	debugfs_create_file("writeback_congestion_kb",
	0600,
	client->debugfs_dir,
	client,
	&congestion_kb_fops);
	if (!client->debugfs_congestion_kb)
	goto out;

	sprintf(name, "../../bdi/%s", dev_name(client->sb->s_bdi->dev));
	client->debugfs_bdi = debugfs_create_symlink("bdi", client->debugfs_dir,
	name);

	return 0;

	out:
	ceph_debugfs_client_cleanup(client);
	return ret;
	}

	void ceph_debugfs_client_cleanup(struct ceph_client *client)
	{
	debugfs_remove(client->debugfs_bdi);
	debugfs_remove(client->debugfs_caps);
	debugfs_remove(client->debugfs_dentry_lru);
	debugfs_remove(client->debugfs_osdmap);
	debugfs_remove(client->debugfs_mdsmap);
	debugfs_remove(client->debugfs_monmap);
	debugfs_remove(client->osdc.debugfs_file);
	debugfs_remove(client->mdsc.debugfs_file);
	debugfs_remove(client->monc.debugfs_file);
	debugfs_remove(client->debugfs_congestion_kb);
	debugfs_remove(client->debugfs_dir);
	}

	#else /* CONFIG_DEBUG_FS */

	int __init 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 */