fs/ceph/debugfs.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #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/math64.h>
 #include <linux/ktime.h>

 #include <linux/ceph/libceph.h>
 #include <linux/ceph/mon_client.h>
 #include <linux/ceph/auth.h>
 #include <linux/ceph/debugfs.h>

 #include "super.h"

 #ifdef CONFIG_DEBUG_FS

 #include "mds_client.h"
 #include "metric.h"

 static int mdsmap_show(struct seq_file *s, void *p)
 {
 	int i;
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_mdsmap *mdsmap;

 	if (!fsc->mdsc || !fsc->mdsc->mdsmap)
 		return 0;
 	mdsmap = fsc->mdsc->mdsmap;
 	seq_printf(s, "epoch %d\n", mdsmap->m_epoch);
 	seq_printf(s, "root %d\n", mdsmap->m_root);
 	seq_printf(s, "max_mds %d\n", mdsmap->m_max_mds);
 	seq_printf(s, "session_timeout %d\n", mdsmap->m_session_timeout);
 	seq_printf(s, "session_autoclose %d\n", mdsmap->m_session_autoclose);
 	for (i = 0; i < mdsmap->possible_max_rank; i++) {
 		struct ceph_entity_addr *addr = &mdsmap->m_info[i].addr;
 		int state = mdsmap->m_info[i].state;
 		seq_printf(s, "\tmds%d\t%s\t(%s)\n", i,
 			       ceph_pr_addr(addr),
 			       ceph_mds_state_name(state));
 	}
 	return 0;
 }

 /*
  * mdsc debugfs
  */
 static int mdsc_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct ceph_mds_request *req;
 	struct rb_node *rp;
 	int pathlen = 0;
 	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 && req->r_session)
 			seq_printf(s, "%lld\tmds%d\t", req->r_tid,
 				   req->r_session->s_mds);
 		else if (!req->r_request)
 			seq_printf(s, "%lld\t(no request)\t", req->r_tid);
 		else
 			seq_printf(s, "%lld\t(no session)\t", req->r_tid);

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

 		if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
 			seq_puts(s, "\t(unsafe)");
 		else
 			seq_puts(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/%pd (%s)",
 				   ceph_ino(d_inode(req->r_dentry->d_parent)),
 				   req->r_dentry,
 				   path ? path : "");
 			spin_unlock(&req->r_dentry->d_lock);
 			ceph_mdsc_free_path(path, pathlen);
 		} else if (req->r_path1) {
 			seq_printf(s, " #%llx/%s", req->r_ino1.ino,
 				   req->r_path1);
 		} else {
 			seq_printf(s, " #%llx", req->r_ino1.ino);
 		}

 		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/%pd (%s)",
 				   req->r_old_dentry_dir ?
 				   ceph_ino(req->r_old_dentry_dir) : 0,
 				   req->r_old_dentry,
 				   path ? path : "");
 			spin_unlock(&req->r_old_dentry->d_lock);
 			ceph_mdsc_free_path(path, pathlen);
 		} else if (req->r_path2 && req->r_op != CEPH_MDS_OP_SYMLINK) {
 			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_puts(s, "\n");
 	}
 	mutex_unlock(&mdsc->mutex);

 	return 0;
 }

 #define CEPH_LAT_METRIC_SHOW(name, total, avg, min, max, sq) {		\
 	s64 _total, _avg, _min, _max, _sq, _st;				\
 	_avg = ktime_to_us(avg);					\
 	_min = ktime_to_us(min == KTIME_MAX ? 0 : min);			\
 	_max = ktime_to_us(max);					\
 	_total = total - 1;						\
 	_sq = _total > 0 ? DIV64_U64_ROUND_CLOSEST(sq, _total) : 0;	\
 	_st = int_sqrt64(_sq);						\
 	_st = ktime_to_us(_st);						\
 	seq_printf(s, "%-14s%-12lld%-16lld%-16lld%-16lld%lld\n",	\
 		   name, total, _avg, _min, _max, _st);			\
 }

 #define CEPH_SZ_METRIC_SHOW(name, total, avg, min, max, sum) {		\
 	u64 _min = min == U64_MAX ? 0 : min;				\
 	seq_printf(s, "%-14s%-12lld%-16llu%-16llu%-16llu%llu\n",	\
 		   name, total, avg, _min, max, sum);			\
 }

 static int metrics_file_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_client_metric *m = &fsc->mdsc->metric;

 	seq_printf(s, "item                               total\n");
 	seq_printf(s, "------------------------------------------\n");
 	seq_printf(s, "%-35s%lld\n", "total inodes",
 		   percpu_counter_sum(&m->total_inodes));
 	seq_printf(s, "%-35s%lld\n", "opened files",
 		   atomic64_read(&m->opened_files));
 	seq_printf(s, "%-35s%lld\n", "pinned i_caps",
 		   atomic64_read(&m->total_caps));
 	seq_printf(s, "%-35s%lld\n", "opened inodes",
 		   percpu_counter_sum(&m->opened_inodes));
 	return 0;
 }

 static const char * const metric_str[] = {
 	"read",
 	"write",
 	"metadata",
 	"copyfrom"
 };
 static int metrics_latency_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_client_metric *cm = &fsc->mdsc->metric;
 	struct ceph_metric *m;
 	s64 total, sum, avg, min, max, sq;
 	int i;

 	seq_printf(s, "item          total       avg_lat(us)     min_lat(us)     max_lat(us)     stdev(us)\n");
 	seq_printf(s, "-----------------------------------------------------------------------------------\n");

 	for (i = 0; i < METRIC_MAX; i++) {
 		m = &cm->metric[i];
 		spin_lock(&m->lock);
 		total = m->total;
 		sum = m->latency_sum;
 		avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
 		min = m->latency_min;
 		max = m->latency_max;
 		sq = m->latency_sq_sum;
 		spin_unlock(&m->lock);
 		CEPH_LAT_METRIC_SHOW(metric_str[i], total, avg, min, max, sq);
 	}

 	return 0;
 }

 static int metrics_size_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_client_metric *cm = &fsc->mdsc->metric;
 	struct ceph_metric *m;
 	s64 total;
 	u64 sum, avg, min, max;
 	int i;

 	seq_printf(s, "item          total       avg_sz(bytes)   min_sz(bytes)   max_sz(bytes)  total_sz(bytes)\n");
 	seq_printf(s, "----------------------------------------------------------------------------------------\n");

 	for (i = 0; i < METRIC_MAX; i++) {
 		/* skip 'metadata' as it doesn't use the size metric */
 		if (i == METRIC_METADATA)
 			continue;
 		m = &cm->metric[i];
 		spin_lock(&m->lock);
 		total = m->total;
 		sum = m->size_sum;
 		avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
 		min = m->size_min;
 		max = m->size_max;
 		spin_unlock(&m->lock);
 		CEPH_SZ_METRIC_SHOW(metric_str[i], total, avg, min, max, sum);
 	}

 	return 0;
 }

 static int metrics_caps_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_client_metric *m = &fsc->mdsc->metric;
 	int nr_caps = 0;

 	seq_printf(s, "item          total           miss            hit\n");
 	seq_printf(s, "-------------------------------------------------\n");

 	seq_printf(s, "%-14s%-16lld%-16lld%lld\n", "d_lease",
 		   atomic64_read(&m->total_dentries),
 		   percpu_counter_sum(&m->d_lease_mis),
 		   percpu_counter_sum(&m->d_lease_hit));

 	nr_caps = atomic64_read(&m->total_caps);
 	seq_printf(s, "%-14s%-16d%-16lld%lld\n", "caps", nr_caps,
 		   percpu_counter_sum(&m->i_caps_mis),
 		   percpu_counter_sum(&m->i_caps_hit));

 	return 0;
 }

 static int caps_show_cb(struct inode *inode, struct ceph_cap *cap, void *p)
 {
 	struct seq_file *s = p;

 	seq_printf(s, "0x%-17llx%-3d%-17s%-17s\n", ceph_ino(inode),
 		   cap->session->s_mds,
 		   ceph_cap_string(cap->issued),
 		   ceph_cap_string(cap->implemented));
 	return 0;
 }

 static int caps_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	int total, avail, used, reserved, min, i;
 	struct cap_wait	*cw;

 	ceph_reservation_status(fsc, &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\t%d\n\n",
 		   total, avail, used, reserved, min);
 	seq_printf(s, "ino              mds  issued           implemented\n");
 	seq_printf(s, "--------------------------------------------------\n");

 	mutex_lock(&mdsc->mutex);
 	for (i = 0; i < mdsc->max_sessions; i++) {
 		struct ceph_mds_session *session;

 		session = __ceph_lookup_mds_session(mdsc, i);
 		if (!session)
 			continue;
 		mutex_unlock(&mdsc->mutex);
 		mutex_lock(&session->s_mutex);
 		ceph_iterate_session_caps(session, caps_show_cb, s);
 		mutex_unlock(&session->s_mutex);
 		ceph_put_mds_session(session);
 		mutex_lock(&mdsc->mutex);
 	}
 	mutex_unlock(&mdsc->mutex);

 	seq_printf(s, "\n\nWaiters:\n--------\n");
 	seq_printf(s, "tgid         ino                need             want\n");
 	seq_printf(s, "-----------------------------------------------------\n");

 	spin_lock(&mdsc->caps_list_lock);
 	list_for_each_entry(cw, &mdsc->cap_wait_list, list) {
 		seq_printf(s, "%-13d0x%-17llx%-17s%-17s\n", cw->tgid, cw->ino,
 				ceph_cap_string(cw->need),
 				ceph_cap_string(cw->want));
 	}
 	spin_unlock(&mdsc->caps_list_lock);

 	return 0;
 }

 static int mds_sessions_show(struct seq_file *s, void *ptr)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct ceph_auth_client *ac = fsc->client->monc.auth;
 	struct ceph_options *opt = fsc->client->options;
 	int mds;

 	mutex_lock(&mdsc->mutex);

 	/* The 'num' portion of an 'entity name' */
 	seq_printf(s, "global_id %llu\n", ac->global_id);

 	/* The -o name mount argument */
 	seq_printf(s, "name \"%s\"\n", opt->name ? opt->name : "");

 	/* The list of MDS session rank+state */
 	for (mds = 0; mds < mdsc->max_sessions; mds++) {
 		struct ceph_mds_session *session =
 			__ceph_lookup_mds_session(mdsc, mds);
 		if (!session) {
 			continue;
 		}
 		mutex_unlock(&mdsc->mutex);
 		seq_printf(s, "mds.%d %s\n",
 				session->s_mds,
 				ceph_session_state_name(session->s_state));

 		ceph_put_mds_session(session);
 		mutex_lock(&mdsc->mutex);
 	}
 	mutex_unlock(&mdsc->mutex);

 	return 0;
 }

 static int status_show(struct seq_file *s, void *p)
 {
 	struct ceph_fs_client *fsc = s->private;
 	struct ceph_entity_inst *inst = &fsc->client->msgr.inst;
 	struct ceph_entity_addr *client_addr = ceph_client_addr(fsc->client);

 	seq_printf(s, "instance: %s.%lld %s/%u\n", ENTITY_NAME(inst->name),
 		   ceph_pr_addr(client_addr), le32_to_cpu(client_addr->nonce));
 	seq_printf(s, "blocklisted: %s\n", fsc->blocklisted ? "true" : "false");

 	return 0;
 }

 DEFINE_SHOW_ATTRIBUTE(mdsmap);
 DEFINE_SHOW_ATTRIBUTE(mdsc);
 DEFINE_SHOW_ATTRIBUTE(caps);
 DEFINE_SHOW_ATTRIBUTE(mds_sessions);
 DEFINE_SHOW_ATTRIBUTE(status);
 DEFINE_SHOW_ATTRIBUTE(metrics_file);
 DEFINE_SHOW_ATTRIBUTE(metrics_latency);
 DEFINE_SHOW_ATTRIBUTE(metrics_size);
 DEFINE_SHOW_ATTRIBUTE(metrics_caps);


 /*
  * debugfs
  */
 static int congestion_kb_set(void *data, u64 val)
 {
 	struct ceph_fs_client *fsc = (struct ceph_fs_client *)data;

 	fsc->mount_options->congestion_kb = (int)val;
 	return 0;
 }

 static int congestion_kb_get(void *data, u64 *val)
 {
 	struct ceph_fs_client *fsc = (struct ceph_fs_client *)data;

 	*val = (u64)fsc->mount_options->congestion_kb;
 	return 0;
 }

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


 void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
 {
 	dout("ceph_fs_debugfs_cleanup\n");
 	debugfs_remove(fsc->debugfs_bdi);
 	debugfs_remove(fsc->debugfs_congestion_kb);
 	debugfs_remove(fsc->debugfs_mdsmap);
 	debugfs_remove(fsc->debugfs_mds_sessions);
 	debugfs_remove(fsc->debugfs_caps);
 	debugfs_remove(fsc->debugfs_status);
 	debugfs_remove(fsc->debugfs_mdsc);
 	debugfs_remove_recursive(fsc->debugfs_metrics_dir);
 }

 void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
 {
 	char name[100];

 	dout("ceph_fs_debugfs_init\n");
 	fsc->debugfs_congestion_kb =
 		debugfs_create_file("writeback_congestion_kb",
 				    0600,
 				    fsc->client->debugfs_dir,
 				    fsc,
 				    &congestion_kb_fops);

 	snprintf(name, sizeof(name), "../../bdi/%s",
 		 bdi_dev_name(fsc->sb->s_bdi));
 	fsc->debugfs_bdi =
 		debugfs_create_symlink("bdi",
 				       fsc->client->debugfs_dir,
 				       name);

 	fsc->debugfs_mdsmap = debugfs_create_file("mdsmap",
 					0400,
 					fsc->client->debugfs_dir,
 					fsc,
 					&mdsmap_fops);

 	fsc->debugfs_mds_sessions = debugfs_create_file("mds_sessions",
 					0400,
 					fsc->client->debugfs_dir,
 					fsc,
 					&mds_sessions_fops);

 	fsc->debugfs_mdsc = debugfs_create_file("mdsc",
 						0400,
 						fsc->client->debugfs_dir,
 						fsc,
 						&mdsc_fops);

 	fsc->debugfs_caps = debugfs_create_file("caps",
 						0400,
 						fsc->client->debugfs_dir,
 						fsc,
 						&caps_fops);

 	fsc->debugfs_status = debugfs_create_file("status",
 						  0400,
 						  fsc->client->debugfs_dir,
 						  fsc,
 						  &status_fops);

 	fsc->debugfs_metrics_dir = debugfs_create_dir("metrics",
 						      fsc->client->debugfs_dir);

 	debugfs_create_file("file", 0400, fsc->debugfs_metrics_dir, fsc,
 			    &metrics_file_fops);
 	debugfs_create_file("latency", 0400, fsc->debugfs_metrics_dir, fsc,
 			    &metrics_latency_fops);
 	debugfs_create_file("size", 0400, fsc->debugfs_metrics_dir, fsc,
 			    &metrics_size_fops);
 	debugfs_create_file("caps", 0400, fsc->debugfs_metrics_dir, fsc,
 			    &metrics_caps_fops);
 }


 #else  /* CONFIG_DEBUG_FS */

 void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
 {
 }

 void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
 {
 }

 #endif  /* CONFIG_DEBUG_FS */
	// SPDX-License-Identifier: GPL-2.0
	#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/math64.h>
	#include <linux/ktime.h>

	#include <linux/ceph/libceph.h>
	#include <linux/ceph/mon_client.h>
	#include <linux/ceph/auth.h>
	#include <linux/ceph/debugfs.h>

	#include "super.h"

	#ifdef CONFIG_DEBUG_FS

	#include "mds_client.h"
	#include "metric.h"

	static int mdsmap_show(struct seq_file s, void p)
	{
	int i;
	struct ceph_fs_client *fsc = s->private;
	struct ceph_mdsmap *mdsmap;

	if (!fsc->mdsc \|\| !fsc->mdsc->mdsmap)
	return 0;
	mdsmap = fsc->mdsc->mdsmap;
	seq_printf(s, "epoch %d\n", mdsmap->m_epoch);
	seq_printf(s, "root %d\n", mdsmap->m_root);
	seq_printf(s, "max_mds %d\n", mdsmap->m_max_mds);
	seq_printf(s, "session_timeout %d\n", mdsmap->m_session_timeout);
	seq_printf(s, "session_autoclose %d\n", mdsmap->m_session_autoclose);
	for (i = 0; i < mdsmap->possible_max_rank; i++) {
	struct ceph_entity_addr *addr = &mdsmap->m_info[i].addr;
	int state = mdsmap->m_info[i].state;
	seq_printf(s, "\tmds%d\t%s\t(%s)\n", i,
	ceph_pr_addr(addr),
	ceph_mds_state_name(state));
	}
	return 0;
	}

	/*
	* mdsc debugfs
	*/
	static int mdsc_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_mds_client *mdsc = fsc->mdsc;
	struct ceph_mds_request *req;
	struct rb_node *rp;
	int pathlen = 0;
	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 && req->r_session)
	seq_printf(s, "%lld\tmds%d\t", req->r_tid,
	req->r_session->s_mds);
	else if (!req->r_request)
	seq_printf(s, "%lld\t(no request)\t", req->r_tid);
	else
	seq_printf(s, "%lld\t(no session)\t", req->r_tid);

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

	if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
	seq_puts(s, "\t(unsafe)");
	else
	seq_puts(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/%pd (%s)",
	ceph_ino(d_inode(req->r_dentry->d_parent)),
	req->r_dentry,
	path ? path : "");
	spin_unlock(&req->r_dentry->d_lock);
	ceph_mdsc_free_path(path, pathlen);
	} else if (req->r_path1) {
	seq_printf(s, " #%llx/%s", req->r_ino1.ino,
	req->r_path1);
	} else {
	seq_printf(s, " #%llx", req->r_ino1.ino);
	}

	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/%pd (%s)",
	req->r_old_dentry_dir ?
	ceph_ino(req->r_old_dentry_dir) : 0,
	req->r_old_dentry,
	path ? path : "");
	spin_unlock(&req->r_old_dentry->d_lock);
	ceph_mdsc_free_path(path, pathlen);
	} else if (req->r_path2 && req->r_op != CEPH_MDS_OP_SYMLINK) {
	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_puts(s, "\n");
	}
	mutex_unlock(&mdsc->mutex);

	return 0;
	}

	#define CEPH_LAT_METRIC_SHOW(name, total, avg, min, max, sq) { \
	s64 _total, _avg, _min, _max, _sq, _st; \
	_avg = ktime_to_us(avg); \
	_min = ktime_to_us(min == KTIME_MAX ? 0 : min); \
	_max = ktime_to_us(max); \
	_total = total - 1; \
	_sq = _total > 0 ? DIV64_U64_ROUND_CLOSEST(sq, _total) : 0; \
	_st = int_sqrt64(_sq); \
	_st = ktime_to_us(_st); \
	seq_printf(s, "%-14s%-12lld%-16lld%-16lld%-16lld%lld\n", \
	name, total, _avg, _min, _max, _st); \
	}

	#define CEPH_SZ_METRIC_SHOW(name, total, avg, min, max, sum) { \
	u64 _min = min == U64_MAX ? 0 : min; \
	seq_printf(s, "%-14s%-12lld%-16llu%-16llu%-16llu%llu\n", \
	name, total, avg, _min, max, sum); \
	}

	static int metrics_file_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_client_metric *m = &fsc->mdsc->metric;

	seq_printf(s, "item total\n");
	seq_printf(s, "------------------------------------------\n");
	seq_printf(s, "%-35s%lld\n", "total inodes",
	percpu_counter_sum(&m->total_inodes));
	seq_printf(s, "%-35s%lld\n", "opened files",
	atomic64_read(&m->opened_files));
	seq_printf(s, "%-35s%lld\n", "pinned i_caps",
	atomic64_read(&m->total_caps));
	seq_printf(s, "%-35s%lld\n", "opened inodes",
	percpu_counter_sum(&m->opened_inodes));
	return 0;
	}

	static const char * const metric_str[] = {
	"read",
	"write",
	"metadata",
	"copyfrom"
	};
	static int metrics_latency_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_client_metric *cm = &fsc->mdsc->metric;
	struct ceph_metric *m;
	s64 total, sum, avg, min, max, sq;
	int i;

	seq_printf(s, "item total avg_lat(us) min_lat(us) max_lat(us) stdev(us)\n");
	seq_printf(s, "-----------------------------------------------------------------------------------\n");

	for (i = 0; i < METRIC_MAX; i++) {
	m = &cm->metric[i];
	spin_lock(&m->lock);
	total = m->total;
	sum = m->latency_sum;
	avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
	min = m->latency_min;
	max = m->latency_max;
	sq = m->latency_sq_sum;
	spin_unlock(&m->lock);
	CEPH_LAT_METRIC_SHOW(metric_str[i], total, avg, min, max, sq);
	}

	return 0;
	}

	static int metrics_size_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_client_metric *cm = &fsc->mdsc->metric;
	struct ceph_metric *m;
	s64 total;
	u64 sum, avg, min, max;
	int i;

	seq_printf(s, "item total avg_sz(bytes) min_sz(bytes) max_sz(bytes) total_sz(bytes)\n");
	seq_printf(s, "----------------------------------------------------------------------------------------\n");

	for (i = 0; i < METRIC_MAX; i++) {
	/* skip 'metadata' as it doesn't use the size metric */
	if (i == METRIC_METADATA)
	continue;
	m = &cm->metric[i];
	spin_lock(&m->lock);
	total = m->total;
	sum = m->size_sum;
	avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
	min = m->size_min;
	max = m->size_max;
	spin_unlock(&m->lock);
	CEPH_SZ_METRIC_SHOW(metric_str[i], total, avg, min, max, sum);
	}

	return 0;
	}

	static int metrics_caps_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_client_metric *m = &fsc->mdsc->metric;
	int nr_caps = 0;

	seq_printf(s, "item total miss hit\n");
	seq_printf(s, "-------------------------------------------------\n");

	seq_printf(s, "%-14s%-16lld%-16lld%lld\n", "d_lease",
	atomic64_read(&m->total_dentries),
	percpu_counter_sum(&m->d_lease_mis),
	percpu_counter_sum(&m->d_lease_hit));

	nr_caps = atomic64_read(&m->total_caps);
	seq_printf(s, "%-14s%-16d%-16lld%lld\n", "caps", nr_caps,
	percpu_counter_sum(&m->i_caps_mis),
	percpu_counter_sum(&m->i_caps_hit));

	return 0;
	}

	static int caps_show_cb(struct inode inode, struct ceph_cap cap, void *p)
	{
	struct seq_file *s = p;

	seq_printf(s, "0x%-17llx%-3d%-17s%-17s\n", ceph_ino(inode),
	cap->session->s_mds,
	ceph_cap_string(cap->issued),
	ceph_cap_string(cap->implemented));
	return 0;
	}

	static int caps_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_mds_client *mdsc = fsc->mdsc;
	int total, avail, used, reserved, min, i;
	struct cap_wait *cw;

	ceph_reservation_status(fsc, &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\t%d\n\n",
	total, avail, used, reserved, min);
	seq_printf(s, "ino mds issued implemented\n");
	seq_printf(s, "--------------------------------------------------\n");

	mutex_lock(&mdsc->mutex);
	for (i = 0; i < mdsc->max_sessions; i++) {
	struct ceph_mds_session *session;

	session = __ceph_lookup_mds_session(mdsc, i);
	if (!session)
	continue;
	mutex_unlock(&mdsc->mutex);
	mutex_lock(&session->s_mutex);
	ceph_iterate_session_caps(session, caps_show_cb, s);
	mutex_unlock(&session->s_mutex);
	ceph_put_mds_session(session);
	mutex_lock(&mdsc->mutex);
	}
	mutex_unlock(&mdsc->mutex);

	seq_printf(s, "\n\nWaiters:\n--------\n");
	seq_printf(s, "tgid ino need want\n");
	seq_printf(s, "-----------------------------------------------------\n");

	spin_lock(&mdsc->caps_list_lock);
	list_for_each_entry(cw, &mdsc->cap_wait_list, list) {
	seq_printf(s, "%-13d0x%-17llx%-17s%-17s\n", cw->tgid, cw->ino,
	ceph_cap_string(cw->need),
	ceph_cap_string(cw->want));
	}
	spin_unlock(&mdsc->caps_list_lock);

	return 0;
	}

	static int mds_sessions_show(struct seq_file s, void ptr)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_mds_client *mdsc = fsc->mdsc;
	struct ceph_auth_client *ac = fsc->client->monc.auth;
	struct ceph_options *opt = fsc->client->options;
	int mds;

	mutex_lock(&mdsc->mutex);

	/* The 'num' portion of an 'entity name' */
	seq_printf(s, "global_id %llu\n", ac->global_id);

	/* The -o name mount argument */
	seq_printf(s, "name \"%s\"\n", opt->name ? opt->name : "");

	/* The list of MDS session rank+state */
	for (mds = 0; mds < mdsc->max_sessions; mds++) {
	struct ceph_mds_session *session =
	__ceph_lookup_mds_session(mdsc, mds);
	if (!session) {
	continue;
	}
	mutex_unlock(&mdsc->mutex);
	seq_printf(s, "mds.%d %s\n",
	session->s_mds,
	ceph_session_state_name(session->s_state));

	ceph_put_mds_session(session);
	mutex_lock(&mdsc->mutex);
	}
	mutex_unlock(&mdsc->mutex);

	return 0;
	}

	static int status_show(struct seq_file s, void p)
	{
	struct ceph_fs_client *fsc = s->private;
	struct ceph_entity_inst *inst = &fsc->client->msgr.inst;
	struct ceph_entity_addr *client_addr = ceph_client_addr(fsc->client);

	seq_printf(s, "instance: %s.%lld %s/%u\n", ENTITY_NAME(inst->name),
	ceph_pr_addr(client_addr), le32_to_cpu(client_addr->nonce));
	seq_printf(s, "blocklisted: %s\n", fsc->blocklisted ? "true" : "false");

	return 0;
	}

	DEFINE_SHOW_ATTRIBUTE(mdsmap);
	DEFINE_SHOW_ATTRIBUTE(mdsc);
	DEFINE_SHOW_ATTRIBUTE(caps);
	DEFINE_SHOW_ATTRIBUTE(mds_sessions);
	DEFINE_SHOW_ATTRIBUTE(status);
	DEFINE_SHOW_ATTRIBUTE(metrics_file);
	DEFINE_SHOW_ATTRIBUTE(metrics_latency);
	DEFINE_SHOW_ATTRIBUTE(metrics_size);
	DEFINE_SHOW_ATTRIBUTE(metrics_caps);


	/*
	* debugfs
	*/
	static int congestion_kb_set(void *data, u64 val)
	{
	struct ceph_fs_client fsc = (struct ceph_fs_client )data;

	fsc->mount_options->congestion_kb = (int)val;
	return 0;
	}

	static int congestion_kb_get(void data, u64 val)
	{
	struct ceph_fs_client fsc = (struct ceph_fs_client )data;

	*val = (u64)fsc->mount_options->congestion_kb;
	return 0;
	}

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


	void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
	{
	dout("ceph_fs_debugfs_cleanup\n");
	debugfs_remove(fsc->debugfs_bdi);
	debugfs_remove(fsc->debugfs_congestion_kb);
	debugfs_remove(fsc->debugfs_mdsmap);
	debugfs_remove(fsc->debugfs_mds_sessions);
	debugfs_remove(fsc->debugfs_caps);
	debugfs_remove(fsc->debugfs_status);
	debugfs_remove(fsc->debugfs_mdsc);
	debugfs_remove_recursive(fsc->debugfs_metrics_dir);
	}

	void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
	{
	char name[100];

	dout("ceph_fs_debugfs_init\n");
	fsc->debugfs_congestion_kb =
	debugfs_create_file("writeback_congestion_kb",
	0600,
	fsc->client->debugfs_dir,
	fsc,
	&congestion_kb_fops);

	snprintf(name, sizeof(name), "../../bdi/%s",
	bdi_dev_name(fsc->sb->s_bdi));
	fsc->debugfs_bdi =
	debugfs_create_symlink("bdi",
	fsc->client->debugfs_dir,
	name);

	fsc->debugfs_mdsmap = debugfs_create_file("mdsmap",
	0400,
	fsc->client->debugfs_dir,
	fsc,
	&mdsmap_fops);

	fsc->debugfs_mds_sessions = debugfs_create_file("mds_sessions",
	0400,
	fsc->client->debugfs_dir,
	fsc,
	&mds_sessions_fops);

	fsc->debugfs_mdsc = debugfs_create_file("mdsc",
	0400,
	fsc->client->debugfs_dir,
	fsc,
	&mdsc_fops);

	fsc->debugfs_caps = debugfs_create_file("caps",
	0400,
	fsc->client->debugfs_dir,
	fsc,
	&caps_fops);

	fsc->debugfs_status = debugfs_create_file("status",
	0400,
	fsc->client->debugfs_dir,
	fsc,
	&status_fops);

	fsc->debugfs_metrics_dir = debugfs_create_dir("metrics",
	fsc->client->debugfs_dir);

	debugfs_create_file("file", 0400, fsc->debugfs_metrics_dir, fsc,
	&metrics_file_fops);
	debugfs_create_file("latency", 0400, fsc->debugfs_metrics_dir, fsc,
	&metrics_latency_fops);
	debugfs_create_file("size", 0400, fsc->debugfs_metrics_dir, fsc,
	&metrics_size_fops);
	debugfs_create_file("caps", 0400, fsc->debugfs_metrics_dir, fsc,
	&metrics_caps_fops);
	}


	#else /* CONFIG_DEBUG_FS */

	void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
	{
	}

	void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
	{
	}

	#endif /* CONFIG_DEBUG_FS */