// SPDX-License-Identifier: GPL-2.0-only

  
  #include <linux/ceph/ceph_debug.h>
  #include <linux/backing-dev.h>
  #include <linux/ctype.h>
  #include <linux/fs.h>
  #include <linux/inet.h>
  #include <linux/in6.h>

  #include <linux/key.h>

  #include <keys/ceph-type.h>

  #include <linux/module.h>
  #include <linux/mount.h>

  #include <linux/nsproxy.h>

  #include <linux/fs_parser.h>

  #include <linux/sched.h>

  #include <linux/sched/mm.h>

  #include <linux/seq_file.h>
  #include <linux/slab.h>
  #include <linux/statfs.h>
  #include <linux/string.h>

  #include <linux/vmalloc.h>

  #include <linux/ceph/ceph_features.h>

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

  #include "crypto.h"

  /*
   * Module compatibility interface.  For now it doesn't do anything,
   * but its existence signals a certain level of functionality.
   *
   * The data buffer is used to pass information both to and from
   * libceph.  The return value indicates whether libceph determines
   * it is compatible with the caller (from another kernel module),
   * given the provided data.
   *
   * The data pointer can be null.
   */
  bool libceph_compatible(void *data)
  {

  	return true;

  }
  EXPORT_SYMBOL(libceph_compatible);

  static int param_get_supported_features(char *buffer,
  					const struct kernel_param *kp)
  {
  	return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
  }
  static const struct kernel_param_ops param_ops_supported_features = {
  	.get = param_get_supported_features,
  };
  module_param_cb(supported_features, &param_ops_supported_features, NULL,

  		0444);

  const char *ceph_msg_type_name(int type)
  {
  	switch (type) {
  	case CEPH_MSG_SHUTDOWN: return "shutdown";
  	case CEPH_MSG_PING: return "ping";
  	case CEPH_MSG_AUTH: return "auth";
  	case CEPH_MSG_AUTH_REPLY: return "auth_reply";
  	case CEPH_MSG_MON_MAP: return "mon_map";
  	case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
  	case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
  	case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
  	case CEPH_MSG_STATFS: return "statfs";
  	case CEPH_MSG_STATFS_REPLY: return "statfs_reply";

  	case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
  	case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";

  	case CEPH_MSG_MDS_MAP: return "mds_map";

  	case CEPH_MSG_FS_MAP_USER: return "fs_map_user";

  	case CEPH_MSG_CLIENT_SESSION: return "client_session";
  	case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
  	case CEPH_MSG_CLIENT_REQUEST: return "client_request";
  	case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
  	case CEPH_MSG_CLIENT_REPLY: return "client_reply";
  	case CEPH_MSG_CLIENT_CAPS: return "client_caps";
  	case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";

  	case CEPH_MSG_CLIENT_QUOTA: return "client_quota";

  	case CEPH_MSG_CLIENT_SNAP: return "client_snap";
  	case CEPH_MSG_CLIENT_LEASE: return "client_lease";

  	case CEPH_MSG_POOLOP_REPLY: return "poolop_reply";
  	case CEPH_MSG_POOLOP: return "poolop";
  	case CEPH_MSG_MON_COMMAND: return "mon_command";
  	case CEPH_MSG_MON_COMMAND_ACK: return "mon_command_ack";

  	case CEPH_MSG_OSD_MAP: return "osd_map";
  	case CEPH_MSG_OSD_OP: return "osd_op";
  	case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";

  	case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";

  	case CEPH_MSG_OSD_BACKOFF: return "osd_backoff";

  	default: return "unknown";
  	}
  }
  EXPORT_SYMBOL(ceph_msg_type_name);
  
  /*
   * Initially learn our fsid, or verify an fsid matches.
   */
  int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
  {
  	if (client->have_fsid) {
  		if (ceph_fsid_compare(&client->fsid, fsid)) {
  			pr_err("bad fsid, had %pU got %pU",
  			       &client->fsid, fsid);
  			return -1;
  		}
  	} else {

  		memcpy(&client->fsid, fsid, sizeof(*fsid));

  	}
  	return 0;
  }
  EXPORT_SYMBOL(ceph_check_fsid);
  
  static int strcmp_null(const char *s1, const char *s2)
  {
  	if (!s1 && !s2)
  		return 0;
  	if (s1 && !s2)
  		return -1;
  	if (!s1 && s2)
  		return 1;
  	return strcmp(s1, s2);
  }
  
  int ceph_compare_options(struct ceph_options *new_opt,
  			 struct ceph_client *client)
  {
  	struct ceph_options *opt1 = new_opt;
  	struct ceph_options *opt2 = client->options;
  	int ofs = offsetof(struct ceph_options, mon_addr);
  	int i;
  	int ret;

  	/*
  	 * Don't bother comparing options if network namespaces don't
  	 * match.
  	 */
  	if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
  		return -1;

  	ret = memcmp(opt1, opt2, ofs);
  	if (ret)
  		return ret;
  
  	ret = strcmp_null(opt1->name, opt2->name);
  	if (ret)
  		return ret;

  	if (opt1->key && !opt2->key)
  		return -1;
  	if (!opt1->key && opt2->key)
  		return 1;
  	if (opt1->key && opt2->key) {
  		if (opt1->key->type != opt2->key->type)
  			return -1;
  		if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
  			return -1;
  		if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
  			return -1;
  		if (opt1->key->len != opt2->key->len)
  			return -1;
  		if (opt1->key->key && !opt2->key->key)
  			return -1;
  		if (!opt1->key->key && opt2->key->key)
  			return 1;
  		if (opt1->key->key && opt2->key->key) {
  			ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
  			if (ret)
  				return ret;
  		}
  	}

  	ret = ceph_compare_crush_locs(&opt1->crush_locs, &opt2->crush_locs);
  	if (ret)
  		return ret;

  	/* any matching mon ip implies a match */
  	for (i = 0; i < opt1->num_mon; i++) {
  		if (ceph_monmap_contains(client->monc.monmap,
  				 &opt1->mon_addr[i]))
  			return 0;
  	}
  	return -1;
  }
  EXPORT_SYMBOL(ceph_compare_options);

  /*
   * kvmalloc() doesn't fall back to the vmalloc allocator unless flags are
   * compatible with (a superset of) GFP_KERNEL.  This is because while the
   * actual pages are allocated with the specified flags, the page table pages

   * are always allocated with GFP_KERNEL.

   *
   * ceph_kvmalloc() may be called with GFP_KERNEL, GFP_NOFS or GFP_NOIO.
   */

  void *ceph_kvmalloc(size_t size, gfp_t flags)
  {

  	void *p;
  
  	if ((flags & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) {
  		p = kvmalloc(size, flags);
  	} else if ((flags & (__GFP_IO | __GFP_FS)) == __GFP_IO) {
  		unsigned int nofs_flag = memalloc_nofs_save();
  		p = kvmalloc(size, GFP_KERNEL);
  		memalloc_nofs_restore(nofs_flag);
  	} else {
  		unsigned int noio_flag = memalloc_noio_save();
  		p = kvmalloc(size, GFP_KERNEL);
  		memalloc_noio_restore(noio_flag);

  	}

  	return p;

  }

  static int parse_fsid(const char *str, struct ceph_fsid *fsid)
  {
  	int i = 0;
  	char tmp[3];
  	int err = -EINVAL;
  	int d;
  
  	dout("parse_fsid '%s'
  ", str);
  	tmp[2] = 0;
  	while (*str && i < 16) {
  		if (ispunct(*str)) {
  			str++;
  			continue;
  		}
  		if (!isxdigit(str[0]) || !isxdigit(str[1]))
  			break;
  		tmp[0] = str[0];
  		tmp[1] = str[1];
  		if (sscanf(tmp, "%x", &d) < 1)
  			break;
  		fsid->fsid[i] = d & 0xff;
  		i++;
  		str += 2;
  	}
  
  	if (i == 16)
  		err = 0;

  	dout("parse_fsid ret %d got fsid %pU
  ", err, fsid);

  	return err;
  }
  
  /*
   * ceph options
   */
  enum {
  	Opt_osdtimeout,
  	Opt_osdkeepalivetimeout,
  	Opt_mount_timeout,
  	Opt_osd_idle_ttl,

  	Opt_osd_request_timeout,

  	/* int args above */
  	Opt_fsid,
  	Opt_name,
  	Opt_secret,

  	Opt_key,

  	Opt_ip,

  	Opt_crush_location,

  	Opt_read_from_replica,

  	/* string args above */

  	Opt_share,

  	Opt_crc,

  	Opt_cephx_require_signatures,

  	Opt_cephx_sign_messages,

  	Opt_tcp_nodelay,

  	Opt_abort_on_full,

  };

  enum {
  	Opt_read_from_replica_no,
  	Opt_read_from_replica_balance,
  	Opt_read_from_replica_localize,
  };
  
  static const struct constant_table ceph_param_read_from_replica[] = {
  	{"no",		Opt_read_from_replica_no},
  	{"balance",	Opt_read_from_replica_balance},
  	{"localize",	Opt_read_from_replica_localize},
  	{}
  };

  static const struct fs_parameter_spec ceph_parameters[] = {

  	fsparam_flag	("abort_on_full",		Opt_abort_on_full),
  	fsparam_flag_no ("cephx_require_signatures",	Opt_cephx_require_signatures),
  	fsparam_flag_no ("cephx_sign_messages",		Opt_cephx_sign_messages),
  	fsparam_flag_no ("crc",				Opt_crc),

  	fsparam_string	("crush_location",		Opt_crush_location),

  	fsparam_string	("fsid",			Opt_fsid),
  	fsparam_string	("ip",				Opt_ip),
  	fsparam_string	("key",				Opt_key),
  	fsparam_u32	("mount_timeout",		Opt_mount_timeout),
  	fsparam_string	("name",			Opt_name),
  	fsparam_u32	("osd_idle_ttl",		Opt_osd_idle_ttl),
  	fsparam_u32	("osd_request_timeout",		Opt_osd_request_timeout),
  	fsparam_u32	("osdkeepalive",		Opt_osdkeepalivetimeout),
  	__fsparam	(fs_param_is_s32, "osdtimeout", Opt_osdtimeout,

  			 fs_param_deprecated, NULL),

  	fsparam_enum	("read_from_replica",		Opt_read_from_replica,
  			 ceph_param_read_from_replica),

  	fsparam_string	("secret",			Opt_secret),
  	fsparam_flag_no ("share",			Opt_share),
  	fsparam_flag_no ("tcp_nodelay",			Opt_tcp_nodelay),
  	{}
  };

  struct ceph_options *ceph_alloc_options(void)
  {
  	struct ceph_options *opt;
  
  	opt = kzalloc(sizeof(*opt), GFP_KERNEL);
  	if (!opt)
  		return NULL;

  	opt->crush_locs = RB_ROOT;

  	opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
  				GFP_KERNEL);
  	if (!opt->mon_addr) {
  		kfree(opt);
  		return NULL;
  	}
  
  	opt->flags = CEPH_OPT_DEFAULT;
  	opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
  	opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
  	opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
  	opt->osd_request_timeout = CEPH_OSD_REQUEST_TIMEOUT_DEFAULT;

  	opt->read_from_replica = CEPH_READ_FROM_REPLICA_DEFAULT;

  	return opt;
  }
  EXPORT_SYMBOL(ceph_alloc_options);

  void ceph_destroy_options(struct ceph_options *opt)
  {
  	dout("destroy_options %p
  ", opt);

  	if (!opt)
  		return;

  	ceph_clear_crush_locs(&opt->crush_locs);

  	kfree(opt->name);

  	if (opt->key) {
  		ceph_crypto_key_destroy(opt->key);
  		kfree(opt->key);
  	}

  	kfree(opt->mon_addr);

  	kfree(opt);
  }
  EXPORT_SYMBOL(ceph_destroy_options);

  /* get secret from key store */

  static int get_secret(struct ceph_crypto_key *dst, const char *name,

  		      struct p_log *log)

  {

  	struct key *ukey;
  	int key_err;
  	int err = 0;

  	struct ceph_crypto_key *ckey;

  	ukey = request_key(&key_type_ceph, name, NULL);

  	if (IS_ERR(ukey)) {

  		/* request_key errors don't map nicely to mount(2)
  		   errors; don't even try, but still printk */
  		key_err = PTR_ERR(ukey);
  		switch (key_err) {
  		case -ENOKEY:

  			error_plog(log, "Failed due to key not found: %s",

  			       name);

  			break;
  		case -EKEYEXPIRED:

  			error_plog(log, "Failed due to expired key: %s",

  			       name);

  			break;
  		case -EKEYREVOKED:

  			error_plog(log, "Failed due to revoked key: %s",

  			       name);

  			break;
  		default:

  			error_plog(log, "Failed due to key error %d: %s",

  			       key_err, name);

  		}
  		err = -EPERM;
  		goto out;
  	}

  	ckey = ukey->payload.data[0];

  	err = ceph_crypto_key_clone(dst, ckey);

  	if (err)
  		goto out_key;
  	/* pass through, err is 0 */
  
  out_key:
  	key_put(ukey);
  out:
  	return err;
  }

  int ceph_parse_mon_ips(const char *buf, size_t len, struct ceph_options *opt,

  		       struct fc_log *l)

  {

  	struct p_log log = {.prefix = "libceph", .log = l};

  	int ret;

  	/* ip1[:port1][,ip2[:port2]...] */

  	ret = ceph_parse_ips(buf, buf + len, opt->mon_addr, CEPH_MAX_MON,
  			     &opt->num_mon);
  	if (ret) {

  		error_plog(&log, "Failed to parse monitor IPs: %d", ret);

  		return ret;
  	}

  	return 0;
  }
  EXPORT_SYMBOL(ceph_parse_mon_ips);
  
  int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,

  		     struct fc_log *l)

  {
  	struct fs_parse_result result;
  	int token, err;

  	struct p_log log = {.prefix = "libceph", .log = l};

  	token = __fs_parse(&log, ceph_parameters, param, &result);

  	dout("%s fs_parse '%s' token %d
  ", __func__, param->key, token);
  	if (token < 0)
  		return token;
  
  	switch (token) {
  	case Opt_ip:
  		err = ceph_parse_ips(param->string,
  				     param->string + param->size,
  				     &opt->my_addr,
  				     1, NULL);
  		if (err) {

  			error_plog(&log, "Failed to parse ip: %d", err);

  			return err;

  		}

  		opt->flags |= CEPH_OPT_MYIP;
  		break;
  
  	case Opt_fsid:
  		err = parse_fsid(param->string, &opt->fsid);
  		if (err) {

  			error_plog(&log, "Failed to parse fsid: %d", err);

  			return err;

  		}

  		opt->flags |= CEPH_OPT_FSID;
  		break;
  	case Opt_name:
  		kfree(opt->name);
  		opt->name = param->string;
  		param->string = NULL;
  		break;
  	case Opt_secret:
  		ceph_crypto_key_destroy(opt->key);
  		kfree(opt->key);

  		opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
  		if (!opt->key)
  			return -ENOMEM;
  		err = ceph_crypto_key_unarmor(opt->key, param->string);
  		if (err) {

  			error_plog(&log, "Failed to parse secret: %d", err);

  			return err;
  		}
  		break;
  	case Opt_key:
  		ceph_crypto_key_destroy(opt->key);
  		kfree(opt->key);

  		opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
  		if (!opt->key)
  			return -ENOMEM;

  		return get_secret(opt->key, param->string, &log);

  	case Opt_crush_location:
  		ceph_clear_crush_locs(&opt->crush_locs);
  		err = ceph_parse_crush_location(param->string,
  						&opt->crush_locs);
  		if (err) {
  			error_plog(&log, "Failed to parse CRUSH location: %d",
  				   err);
  			return err;
  		}
  		break;

  	case Opt_read_from_replica:
  		switch (result.uint_32) {
  		case Opt_read_from_replica_no:

  			opt->read_from_replica = 0;

  			break;
  		case Opt_read_from_replica_balance:

  			opt->read_from_replica = CEPH_OSD_FLAG_BALANCE_READS;

  			break;
  		case Opt_read_from_replica_localize:

  			opt->read_from_replica = CEPH_OSD_FLAG_LOCALIZE_READS;

  			break;
  		default:
  			BUG();
  		}
  		break;

  
  	case Opt_osdtimeout:

  		warn_plog(&log, "Ignoring osdtimeout");

  		break;
  	case Opt_osdkeepalivetimeout:
  		/* 0 isn't well defined right now, reject it */
  		if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
  			goto out_of_range;
  		opt->osd_keepalive_timeout =
  		    msecs_to_jiffies(result.uint_32 * 1000);
  		break;
  	case Opt_osd_idle_ttl:
  		/* 0 isn't well defined right now, reject it */
  		if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
  			goto out_of_range;
  		opt->osd_idle_ttl = msecs_to_jiffies(result.uint_32 * 1000);
  		break;
  	case Opt_mount_timeout:
  		/* 0 is "wait forever" (i.e. infinite timeout) */
  		if (result.uint_32 > INT_MAX / 1000)
  			goto out_of_range;
  		opt->mount_timeout = msecs_to_jiffies(result.uint_32 * 1000);
  		break;
  	case Opt_osd_request_timeout:
  		/* 0 is "wait forever" (i.e. infinite timeout) */
  		if (result.uint_32 > INT_MAX / 1000)
  			goto out_of_range;
  		opt->osd_request_timeout =
  		    msecs_to_jiffies(result.uint_32 * 1000);
  		break;
  
  	case Opt_share:
  		if (!result.negated)

  			opt->flags &= ~CEPH_OPT_NOSHARE;

  		else

  			opt->flags |= CEPH_OPT_NOSHARE;

  		break;
  	case Opt_crc:
  		if (!result.negated)

  			opt->flags &= ~CEPH_OPT_NOCRC;

  		else

  			opt->flags |= CEPH_OPT_NOCRC;

  		break;
  	case Opt_cephx_require_signatures:
  		if (!result.negated)

  			opt->flags &= ~CEPH_OPT_NOMSGAUTH;

  		else

  			opt->flags |= CEPH_OPT_NOMSGAUTH;

  		break;
  	case Opt_cephx_sign_messages:
  		if (!result.negated)

  			opt->flags &= ~CEPH_OPT_NOMSGSIGN;

  		else

  			opt->flags |= CEPH_OPT_NOMSGSIGN;

  		break;
  	case Opt_tcp_nodelay:
  		if (!result.negated)

  			opt->flags |= CEPH_OPT_TCP_NODELAY;

  		else

  			opt->flags &= ~CEPH_OPT_TCP_NODELAY;

  		break;

  	case Opt_abort_on_full:
  		opt->flags |= CEPH_OPT_ABORT_ON_FULL;
  		break;

  	default:
  		BUG();

  	}

  	return 0;

  out_of_range:

  	return inval_plog(&log, "%s out of range", param->key);

  }

  EXPORT_SYMBOL(ceph_parse_param);

  int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
  			      bool show_all)

  {
  	struct ceph_options *opt = client->options;
  	size_t pos = m->count;

  	struct rb_node *n;

  	if (opt->name) {
  		seq_puts(m, "name=");
  		seq_escape(m, opt->name, ", \t
  \\");
  		seq_putc(m, ',');
  	}

  	if (opt->key)
  		seq_puts(m, "secret=<hidden>,");

  	if (!RB_EMPTY_ROOT(&opt->crush_locs)) {
  		seq_puts(m, "crush_location=");
  		for (n = rb_first(&opt->crush_locs); ; ) {
  			struct crush_loc_node *loc =
  			    rb_entry(n, struct crush_loc_node, cl_node);
  
  			seq_printf(m, "%s:%s", loc->cl_loc.cl_type_name,
  				   loc->cl_loc.cl_name);
  			n = rb_next(n);
  			if (!n)
  				break;
  
  			seq_putc(m, '|');
  		}
  		seq_putc(m, ',');
  	}

  	if (opt->read_from_replica == CEPH_OSD_FLAG_BALANCE_READS) {

  		seq_puts(m, "read_from_replica=balance,");

  	} else if (opt->read_from_replica == CEPH_OSD_FLAG_LOCALIZE_READS) {

  		seq_puts(m, "read_from_replica=localize,");
  	}

  	if (opt->flags & CEPH_OPT_FSID)
  		seq_printf(m, "fsid=%pU,", &opt->fsid);
  	if (opt->flags & CEPH_OPT_NOSHARE)
  		seq_puts(m, "noshare,");
  	if (opt->flags & CEPH_OPT_NOCRC)
  		seq_puts(m, "nocrc,");
  	if (opt->flags & CEPH_OPT_NOMSGAUTH)
  		seq_puts(m, "nocephx_require_signatures,");

  	if (opt->flags & CEPH_OPT_NOMSGSIGN)
  		seq_puts(m, "nocephx_sign_messages,");

  	if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
  		seq_puts(m, "notcp_nodelay,");

  	if (show_all && (opt->flags & CEPH_OPT_ABORT_ON_FULL))
  		seq_puts(m, "abort_on_full,");

  
  	if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)

  		seq_printf(m, "mount_timeout=%d,",
  			   jiffies_to_msecs(opt->mount_timeout) / 1000);

  	if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)

  		seq_printf(m, "osd_idle_ttl=%d,",
  			   jiffies_to_msecs(opt->osd_idle_ttl) / 1000);

  	if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
  		seq_printf(m, "osdkeepalivetimeout=%d,",

  		    jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);

  	if (opt->osd_request_timeout != CEPH_OSD_REQUEST_TIMEOUT_DEFAULT)
  		seq_printf(m, "osd_request_timeout=%d,",
  			   jiffies_to_msecs(opt->osd_request_timeout) / 1000);

  
  	/* drop redundant comma */
  	if (m->count != pos)
  		m->count--;
  
  	return 0;
  }
  EXPORT_SYMBOL(ceph_print_client_options);

  struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client)
  {
  	return &client->msgr.inst.addr;
  }
  EXPORT_SYMBOL(ceph_client_addr);

  u64 ceph_client_gid(struct ceph_client *client)

  {
  	return client->monc.auth->global_id;
  }

  EXPORT_SYMBOL(ceph_client_gid);

  
  /*
   * create a fresh client instance
   */

  struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)

  {
  	struct ceph_client *client;

  	struct ceph_entity_addr *myaddr = NULL;

  	int err;
  
  	err = wait_for_random_bytes();
  	if (err < 0)
  		return ERR_PTR(err);

  
  	client = kzalloc(sizeof(*client), GFP_KERNEL);
  	if (client == NULL)
  		return ERR_PTR(-ENOMEM);
  
  	client->private = private;
  	client->options = opt;
  
  	mutex_init(&client->mount_mutex);
  	init_waitqueue_head(&client->auth_wq);
  	client->auth_err = 0;
  
  	client->extra_mon_dispatch = NULL;

  	client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
  	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
  
  	if (!ceph_test_opt(client, NOMSGAUTH))
  		client->required_features |= CEPH_FEATURE_MSG_AUTH;

  
  	/* msgr */
  	if (ceph_test_opt(client, MYIP))
  		myaddr = &client->options->my_addr;

  	ceph_messenger_init(&client->msgr, myaddr);

  
  	/* subsystems */
  	err = ceph_monc_init(&client->monc, client);
  	if (err < 0)

  		goto fail;

  	err = ceph_osdc_init(&client->osdc, client);
  	if (err < 0)
  		goto fail_monc;
  
  	return client;
  
  fail_monc:
  	ceph_monc_stop(&client->monc);
  fail:

  	ceph_messenger_fini(&client->msgr);

  	kfree(client);
  	return ERR_PTR(err);
  }
  EXPORT_SYMBOL(ceph_create_client);
  
  void ceph_destroy_client(struct ceph_client *client)
  {
  	dout("destroy_client %p
  ", client);

  	atomic_set(&client->msgr.stopping, 1);

  	/* unmount */
  	ceph_osdc_stop(&client->osdc);

  	ceph_monc_stop(&client->monc);

  	ceph_messenger_fini(&client->msgr);

  
  	ceph_debugfs_client_cleanup(client);

  	ceph_destroy_options(client->options);
  
  	kfree(client);
  	dout("destroy_client %p done
  ", client);
  }
  EXPORT_SYMBOL(ceph_destroy_client);

  void ceph_reset_client_addr(struct ceph_client *client)
  {
  	ceph_messenger_reset_nonce(&client->msgr);
  	ceph_monc_reopen_session(&client->monc);
  	ceph_osdc_reopen_osds(&client->osdc);
  }
  EXPORT_SYMBOL(ceph_reset_client_addr);

  /*
   * true if we have the mon map (and have thus joined the cluster)
   */

  static bool have_mon_and_osd_map(struct ceph_client *client)

  {
  	return client->monc.monmap && client->monc.monmap->epoch &&
  	       client->osdc.osdmap && client->osdc.osdmap->epoch;
  }
  
  /*
   * mount: join the ceph cluster, and open root directory.
   */
  int __ceph_open_session(struct ceph_client *client, unsigned long started)
  {

  	unsigned long timeout = client->options->mount_timeout;

  	long err;

  	/* open session, and wait for mon and osd maps */
  	err = ceph_monc_open_session(&client->monc);
  	if (err < 0)
  		return err;
  
  	while (!have_mon_and_osd_map(client)) {

  		if (timeout && time_after_eq(jiffies, started + timeout))

  			return -ETIMEDOUT;

  
  		/* wait */
  		dout("mount waiting for mon_map
  ");
  		err = wait_event_interruptible_timeout(client->auth_wq,
  			have_mon_and_osd_map(client) || (client->auth_err < 0),

  			ceph_timeout_jiffies(timeout));

  		if (err < 0)

  			return err;
  		if (client->auth_err < 0)
  			return client->auth_err;
  	}

  	pr_info("client%llu fsid %pU
  ", ceph_client_gid(client),
  		&client->fsid);

  	ceph_debugfs_client_init(client);

  	return 0;
  }
  EXPORT_SYMBOL(__ceph_open_session);

  int ceph_open_session(struct ceph_client *client)
  {
  	int ret;
  	unsigned long started = jiffies;  /* note the start time */
  
  	dout("open_session start
  ");
  	mutex_lock(&client->mount_mutex);
  
  	ret = __ceph_open_session(client, started);
  
  	mutex_unlock(&client->mount_mutex);
  	return ret;
  }
  EXPORT_SYMBOL(ceph_open_session);

  int ceph_wait_for_latest_osdmap(struct ceph_client *client,
  				unsigned long timeout)
  {
  	u64 newest_epoch;
  	int ret;
  
  	ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch);
  	if (ret)
  		return ret;
  
  	if (client->osdc.osdmap->epoch >= newest_epoch)
  		return 0;
  
  	ceph_osdc_maybe_request_map(&client->osdc);
  	return ceph_monc_wait_osdmap(&client->monc, newest_epoch, timeout);
  }
  EXPORT_SYMBOL(ceph_wait_for_latest_osdmap);

  
  static int __init init_ceph_lib(void)
  {
  	int ret = 0;

  	ceph_debugfs_init();

  	ret = ceph_crypto_init();

  	if (ret < 0)
  		goto out_debugfs;

  	ret = ceph_msgr_init();
  	if (ret < 0)
  		goto out_crypto;

  	ret = ceph_osdc_setup();
  	if (ret < 0)
  		goto out_msgr;

  	pr_info("loaded (mon/osd proto %d/%d)
  ",
  		CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);

  
  	return 0;

  out_msgr:
  	ceph_msgr_exit();

  out_crypto:
  	ceph_crypto_shutdown();

  out_debugfs:
  	ceph_debugfs_cleanup();

  	return ret;
  }
  
  static void __exit exit_ceph_lib(void)
  {
  	dout("exit_ceph_lib
  ");

  	WARN_ON(!ceph_strings_empty());

  	ceph_osdc_cleanup();

  	ceph_msgr_exit();

  	ceph_crypto_shutdown();

  	ceph_debugfs_cleanup();
  }
  
  module_init(init_ceph_lib);
  module_exit(exit_ceph_lib);
  
  MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
  MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
  MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");

  MODULE_DESCRIPTION("Ceph core library");

  MODULE_LICENSE("GPL");