Date:	Wed, 15 Jul 2009 14:24:49 -0700
From:	Sage Weil <sage@...dream.net>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Sage Weil <sage@...dream.net>
Subject: [PATCH 19/20] ceph: debugfs

Basic state information is available via /debug/ceph, including
instances of the client, fsids, current monitor, mds and osd maps,
outstanding server requests, and hooks to adjust debug levels.

Signed-off-by: Sage Weil <sage@...dream.net>
---
 fs/ceph/debugfs.c |  604 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 604 insertions(+), 0 deletions(-)
 create mode 100644 fs/ceph/debugfs.c

diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
new file mode 100644
index 0000000..bf399e7
--- /dev/null
+++ b/fs/ceph/debugfs.c
@@ -0,0 +1,604 @@
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "super.h"
+#include "mds_client.h"
+
+static struct dentry *ceph_debugfs_dir;
+static struct dentry *ceph_debugfs_debug;
+static struct dentry *ceph_debugfs_debug_msgr;
+static struct dentry *ceph_debugfs_debug_console;
+static struct dentry *ceph_debugfs_debug_mask;
+static struct dentry *ceph_debugfs_caps_reservation;
+
+/*
+ * ceph_debug_mask
+ */
+struct _debug_mask_name {
+	int mask;
+	char *name;
+};
+
+static struct _debug_mask_name _debug_mask_names[] = {
+		{DOUT_MASK_ADDR, "addr"},
+		{DOUT_MASK_CAPS, "caps"},
+		{DOUT_MASK_DIR, "dir"},
+		{DOUT_MASK_EXPORT, "export"},
+		{DOUT_MASK_FILE, "file"},
+		{DOUT_MASK_INODE, "inode"},
+		{DOUT_MASK_IOCTL, "ioctl"},
+		{DOUT_MASK_MDSC, "mdsc"},
+		{DOUT_MASK_MDSMAP, "mdsmap"},
+		{DOUT_MASK_MSGR, "msgr"},
+		{DOUT_MASK_MON, "mon"},
+		{DOUT_MASK_OSDC, "osdc"},
+		{DOUT_MASK_OSDMAP, "osdmap"},
+		{DOUT_MASK_SNAP, "snap"},
+		{DOUT_MASK_SUPER, "super"},
+		{DOUT_MASK_PROTOCOL, "protocol"},
+		{DOUT_MASK_PROC, "proc"},
+		{DOUT_MASK_TOOLS, "tools"},
+		{0, NULL}
+};
+
+static int debug_mask_show(struct seq_file *s, void *p)
+{
+	int i = 0;
+	seq_printf(s, "0x%x", ceph_debug_mask);
+
+	while (_debug_mask_names[i].mask) {
+		if (ceph_debug_mask & _debug_mask_names[i].mask)
+			seq_printf(s, " %s",
+				       _debug_mask_names[i].name);
+		i++;
+	}
+	seq_printf(s, "\n");
+	return 0;
+}
+
+static int get_debug_mask(const char *name, int len)
+{
+	int i = 0;
+
+	while (_debug_mask_names[i].name) {
+		if (strncmp(_debug_mask_names[i].name, name, len) == 0)
+			return _debug_mask_names[i].mask;
+		i++;
+	}
+	return 0;
+}
+
+static ssize_t debug_mask_store(struct file *file, const char __user *buffer,
+				size_t count, loff_t *data)
+{
+	char *next, *tok;
+	char *buf;
+
+	if (count > PAGE_SIZE)
+		return -EINVAL;
+
+	buf = kmalloc(count + 1, GFP_KERNEL);
+
+	if (copy_from_user(buf, buffer, count))
+		return -EFAULT;
+
+	buf[count] = '\0';
+
+	next = buf;
+
+	while (1) {
+		tok = next;
+		next = strpbrk(tok, " \t\r\n");
+		if (!next)
+			break;
+		if (isdigit(*tok)) {
+			ceph_debug_mask = simple_strtol(tok, NULL, 0);
+		} else {
+			int remove = 0;
+			int mask;
+
+			if (*tok == '-') {
+				remove = 1;
+				tok++;
+			} else if (*tok == '+')
+				tok++;
+			mask = get_debug_mask(tok, next-tok);
+			if (mask) {
+				if (remove)
+					ceph_debug_mask &= ~mask;
+				else
+					ceph_debug_mask |= mask;
+			}
+		}
+		next++;
+	}
+
+	kfree(buf);
+
+	return count;
+}
+
+static int debug_mask_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debug_mask_show, NULL);
+}
+
+static const struct file_operations ceph_debug_mask_fops = {
+	.open		= debug_mask_open,
+	.read		= seq_read,
+	.write		= debug_mask_store,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int fsid_show(struct seq_file *s, void *p)
+{
+	struct ceph_client *client = s->private;
+
+	seq_printf(s, "%llx.%llx\n",
+	       le64_to_cpu(__ceph_fsid_major(&client->monc.monmap->fsid)),
+	       le64_to_cpu(__ceph_fsid_minor(&client->monc.monmap->fsid)));
+	return 0;
+}
+
+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%d\t%u.%u.%u.%u:%u\n",
+			       ENTITY_NAME(inst->name),
+			       IPQUADPORT(inst->addr.ipaddr));
+	}
+	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_addr[i];
+		int state = client->mdsc.mdsmap->m_state[i];
+
+		seq_printf(s, "\tmds%d\t%u.%u.%u.%u:%u\t(%s)\n",
+			       i,
+			       IPQUADPORT(addr->ipaddr),
+			       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;
+
+	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 (i = 0; i < client->osdc.osdmap->num_pools; i++) {
+		struct ceph_pg_pool_info *pool =
+			&client->osdc.osdmap->pg_pool[i];
+		seq_printf(s, "pg_pool %d pg_num %d / %d, lpg_num %d / %d\n",
+			   i, 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%u.%u.%u.%u:%u\t%3d%%\t(%s)\n",
+		       i, IPQUADPORT(addr->ipaddr),
+		       ((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_statfs_request *req;
+	u64 nexttid = 0;
+	int got;
+	struct ceph_mon_client *monc = &client->monc;
+
+	mutex_lock(&monc->statfs_mutex);
+
+	if (monc->want_osdmap)
+		seq_printf(s, "want osdmap %u\n", (unsigned)monc->want_osdmap);
+	if (monc->want_mdsmap)
+		seq_printf(s, "want mdsmap %u\n", (unsigned)monc->want_mdsmap);
+
+	while (nexttid < monc->last_tid) {
+		got = radix_tree_gang_lookup(&monc->statfs_request_tree,
+					     (void **)&req, nexttid, 1);
+		if (got == 0)
+			break;
+		nexttid = req->tid + 1;
+
+		seq_printf(s, "%u.%u.%u.%u:%u (%s%d)\tstatfs\n",
+			IPQUADPORT(req->request->hdr.dst.addr.ipaddr),
+			ENTITY_NAME(req->request->hdr.dst.name));
+	}
+	mutex_unlock(&monc->statfs_mutex);
+
+	return 0;
+}
+
+static int mdsc_show(struct seq_file *s, void *p)
+{
+	struct ceph_client *client = s->private;
+	struct ceph_mds_request *req;
+	u64 nexttid = 0;
+	int got;
+	struct ceph_mds_client *mdsc = &client->mdsc;
+	int pathlen;
+	u64 pathbase;
+	char *path;
+
+	mutex_lock(&mdsc->mutex);
+	while (nexttid < mdsc->last_tid) {
+		got = radix_tree_gang_lookup(&mdsc->request_tree,
+					     (void **)&req, nexttid, 1);
+		if (got == 0)
+			break;
+		nexttid = req->r_tid + 1;
+
+		seq_printf(s, "%lld\t%u.%u.%u.%u:%u (%s%d)\t",
+			   req->r_tid,
+			   IPQUADPORT(req->r_request->hdr.dst.addr.ipaddr),
+			   ENTITY_NAME(req->r_request->hdr.dst.name));
+
+		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);
+			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);
+			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 *p)
+{
+	struct ceph_client *client = s->private;
+	struct ceph_osd_client *osdc = &client->osdc;
+	u64 nexttid = 0;
+
+	mutex_lock(&osdc->request_mutex);
+	while (nexttid < osdc->last_tid) {
+		struct ceph_osd_request *req;
+		struct ceph_osd_request_head *head;
+		struct ceph_osd_op *op;
+		int num_ops;
+		int opcode, olen;
+		int got, i;
+
+		got = radix_tree_gang_lookup(&osdc->request_tree,
+					     (void **)&req, nexttid, 1);
+		if (got == 0)
+			break;
+
+		nexttid = req->r_tid + 1;
+
+		seq_printf(s, "%lld\t%u.%u.%u.%u:%u (%s%d)\t",
+			   req->r_tid,
+			   IPQUADPORT(req->r_request->hdr.dst.addr.ipaddr),
+			   ENTITY_NAME(req->r_request->hdr.dst.name));
+
+		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_reservation_show(struct seq_file *s, void *p)
+{
+	int total, avail, used, reserved;
+
+	ceph_reservation_status(&total, &avail, &used, &reserved);
+
+	seq_printf(s, "total\t\t%d\n"
+		      "avail\t\t%d\n"
+		      "used\t\t%d\n"
+		      "reserved\t%d\n",
+		   total, avail, used, reserved);
+	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(fsid_show)
+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(caps_reservation_show)
+DEFINE_SHOW_FUNC(dentry_lru_show)
+
+int ceph_debugfs_init(void)
+{
+	int ret = -ENOMEM;
+
+	ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
+
+	if (!ceph_debugfs_dir)
+		goto out;
+
+	ceph_debugfs_debug = debugfs_create_u32("debug",
+					0600,
+					ceph_debugfs_dir,
+					(u32 *)&ceph_debug);
+	if (!ceph_debugfs_debug)
+		goto out;
+
+	ceph_debugfs_debug_msgr = debugfs_create_u32("msgr",
+					0600,
+					ceph_debugfs_dir,
+					(u32 *)&ceph_debug_msgr);
+	if (!ceph_debugfs_debug_msgr)
+		goto out;
+
+	ceph_debugfs_debug_console = debugfs_create_u32("console",
+					0600,
+					ceph_debugfs_dir,
+					(u32 *)&ceph_debug_console);
+	if (!ceph_debugfs_debug_console)
+		goto out;
+
+	ceph_debugfs_debug_mask = debugfs_create_file("mask",
+					0600,
+					ceph_debugfs_dir,
+					NULL,
+					&ceph_debug_mask_fops);
+	if (!ceph_debugfs_debug_mask)
+		goto out;
+
+	ceph_debugfs_caps_reservation = debugfs_create_file("caps_reservation",
+					0400,
+					ceph_debugfs_dir,
+					NULL,
+					&caps_reservation_show_fops);
+	if (!ceph_debugfs_caps_reservation)
+		goto out;
+
+	return 0;
+
+out:
+	ceph_debugfs_cleanup();
+	return ret;
+}
+
+void ceph_debugfs_cleanup(void)
+{
+	debugfs_remove(ceph_debugfs_caps_reservation);
+	debugfs_remove(ceph_debugfs_debug_console);
+	debugfs_remove(ceph_debugfs_debug_mask);
+	debugfs_remove(ceph_debugfs_debug_msgr);
+	debugfs_remove(ceph_debugfs_debug);
+	debugfs_remove(ceph_debugfs_dir);
+}
+
+int ceph_debugfs_client_init(struct ceph_client *client)
+{
+	int ret = 0;
+#define TMP_NAME_SIZE 16
+	char name[TMP_NAME_SIZE];
+
+	snprintf(name, TMP_NAME_SIZE, "client%d", client->whoami);
+
+	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 (ret)
+		goto out;
+
+	client->mdsc.debugfs_file = debugfs_create_file("mdsc",
+						      0600,
+						      client->debugfs_dir,
+						      client,
+						      &mdsc_show_fops);
+	if (ret)
+		goto out;
+
+	client->osdc.debugfs_file = debugfs_create_file("osdc",
+						      0600,
+						      client->debugfs_dir,
+						      client,
+						      &osdc_show_fops);
+	if (ret)
+		goto out;
+
+	client->debugfs_fsid = debugfs_create_file("fsid",
+					0600,
+					client->debugfs_dir,
+					client,
+					&fsid_show_fops);
+	if (!client->debugfs_fsid)
+		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_osdmap)
+		goto out;
+
+	return 0;
+
+out:
+	ceph_debugfs_client_cleanup(client);
+	return ret;
+}
+
+void ceph_debugfs_client_cleanup(struct ceph_client *client)
+{
+	debugfs_remove(client->monc.debugfs_file);
+	debugfs_remove(client->mdsc.debugfs_file);
+	debugfs_remove(client->osdc.debugfs_file);
+	debugfs_remove(client->debugfs_dentry_lru);
+	debugfs_remove(client->debugfs_monmap);
+	debugfs_remove(client->debugfs_mdsmap);
+	debugfs_remove(client->debugfs_osdmap);
+	debugfs_remove(client->debugfs_fsid);
+	debugfs_remove(client->debugfs_dir);
+}
+
-- 
1.5.6.5

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