[net-next-2.6.git] / net / ceph / ceph_common.c


#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/module.h>
#include <linux/mount.h>
#include <linux/parser.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/string.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>


/*
 * find filename portion of a path (/foo/bar/baz -> baz)
 */
const char *ceph_file_part(const char *s, int len)
{
	const char *e = s + len;

	while (e != s && *(e-1) != '/')
		e--;
	return e;
}
EXPORT_SYMBOL(ceph_file_part);

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_MDS_MAP: return "mds_map";
	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_SNAP: return "client_snap";
	case CEPH_MSG_CLIENT_LEASE: return "client_lease";
	case CEPH_MSG_OSD_MAP: return "osd_map";
	case CEPH_MSG_OSD_OP: return "osd_op";
	case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
	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 {
		pr_info("client%lld fsid %pU\n", ceph_client_id(client), fsid);
		memcpy(&client->fsid, fsid, sizeof(*fsid));
		ceph_debugfs_client_init(client);
		client->have_fsid = true;
	}
	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;

	ret = memcmp(opt1, opt2, ofs);
	if (ret)
		return ret;

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

	ret = strcmp_null(opt1->secret, opt2->secret);
	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);


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'\n", 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_last_int,
	/* int args above */
	Opt_fsid,
	Opt_name,
	Opt_secret,
	Opt_ip,
	Opt_last_string,
	/* string args above */
	Opt_noshare,
	Opt_nocrc,
};

static match_table_t opt_tokens = {
	{Opt_osdtimeout, "osdtimeout=%d"},
	{Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
	{Opt_mount_timeout, "mount_timeout=%d"},
	{Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
	/* int args above */
	{Opt_fsid, "fsid=%s"},
	{Opt_name, "name=%s"},
	{Opt_secret, "secret=%s"},
	{Opt_ip, "ip=%s"},
	/* string args above */
	{Opt_noshare, "noshare"},
	{Opt_nocrc, "nocrc"},
	{-1, NULL}
};

void ceph_destroy_options(struct ceph_options *opt)
{
	dout("destroy_options %p\n", opt);
	kfree(opt->name);
	kfree(opt->secret);
	kfree(opt);
}
EXPORT_SYMBOL(ceph_destroy_options);

int ceph_parse_options(struct ceph_options **popt, char *options,
		       const char *dev_name, const char *dev_name_end,
		       int (*parse_extra_token)(char *c, void *private),
		       void *private)
{
	struct ceph_options *opt;
	const char *c;
	int err = -ENOMEM;
	substring_t argstr[MAX_OPT_ARGS];

	opt = kzalloc(sizeof(*opt), GFP_KERNEL);
	if (!opt)
		return err;
	opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
				GFP_KERNEL);
	if (!opt->mon_addr)
		goto out;

	dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
	     dev_name);

	/* start with defaults */
	opt->flags = CEPH_OPT_DEFAULT;
	opt->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
	opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
	opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
	opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */

	/* get mon ip(s) */
	/* ip1[:port1][,ip2[:port2]...] */
	err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
			     CEPH_MAX_MON, &opt->num_mon);
	if (err < 0)
		goto out;

	/* parse mount options */
	while ((c = strsep(&options, ",")) != NULL) {
		int token, intval, ret;
		if (!*c)
			continue;
		err = -EINVAL;
		token = match_token((char *)c, opt_tokens, argstr);
		if (token < 0 && parse_extra_token) {
			/* extra? */
			err = parse_extra_token((char *)c, private);
			if (err < 0) {
				pr_err("bad option at '%s'\n", c);
				goto out;
			}
			continue;
		}
		if (token < Opt_last_int) {
			ret = match_int(&argstr[0], &intval);
			if (ret < 0) {
				pr_err("bad mount option arg (not int) "
				       "at '%s'\n", c);
				continue;
			}
			dout("got int token %d val %d\n", token, intval);
		} else if (token > Opt_last_int && token < Opt_last_string) {
			dout("got string token %d val %s\n", token,
			     argstr[0].from);
		} else {
			dout("got token %d\n", token);
		}
		switch (token) {
		case Opt_ip:
			err = ceph_parse_ips(argstr[0].from,
					     argstr[0].to,
					     &opt->my_addr,
					     1, NULL);
			if (err < 0)
				goto out;
			opt->flags |= CEPH_OPT_MYIP;
			break;

		case Opt_fsid:
			err = parse_fsid(argstr[0].from, &opt->fsid);
			if (err == 0)
				opt->flags |= CEPH_OPT_FSID;
			break;
		case Opt_name:
			opt->name = kstrndup(argstr[0].from,
					      argstr[0].to-argstr[0].from,
					      GFP_KERNEL);
			break;
		case Opt_secret:
			opt->secret = kstrndup(argstr[0].from,
						argstr[0].to-argstr[0].from,
						GFP_KERNEL);
			break;

			/* misc */
		case Opt_osdtimeout:
			opt->osd_timeout = intval;
			break;
		case Opt_osdkeepalivetimeout:
			opt->osd_keepalive_timeout = intval;
			break;
		case Opt_osd_idle_ttl:
			opt->osd_idle_ttl = intval;
			break;
		case Opt_mount_timeout:
			opt->mount_timeout = intval;
			break;

		case Opt_noshare:
			opt->flags |= CEPH_OPT_NOSHARE;
			break;

		case Opt_nocrc:
			opt->flags |= CEPH_OPT_NOCRC;
			break;

		default:
			BUG_ON(token);
		}
	}

	/* success */
	*popt = opt;
	return 0;

out:
	ceph_destroy_options(opt);
	return err;
}
EXPORT_SYMBOL(ceph_parse_options);

u64 ceph_client_id(struct ceph_client *client)
{
	return client->monc.auth->global_id;
}
EXPORT_SYMBOL(ceph_client_id);

/*
 * create a fresh client instance
 */
struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
{
	struct ceph_client *client;
	int err = -ENOMEM;

	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_FEATURE_SUPPORTED_DEFAULT;
	client->required_features = CEPH_FEATURE_REQUIRED_DEFAULT;

	client->msgr = NULL;

	/* 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:
	kfree(client);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(ceph_create_client);

void ceph_destroy_client(struct ceph_client *client)
{
	dout("destroy_client %p\n", client);

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

	/*
	 * make sure mds and osd connections close out before destroying
	 * the auth module, which is needed to free those connections'
	 * ceph_authorizers.
	 */
	ceph_msgr_flush();

	ceph_monc_stop(&client->monc);

	ceph_debugfs_client_cleanup(client);

	if (client->msgr)
		ceph_messenger_destroy(client->msgr);

	ceph_destroy_options(client->options);

	kfree(client);
	dout("destroy_client %p done\n", client);
}
EXPORT_SYMBOL(ceph_destroy_client);

/*
 * true if we have the mon map (and have thus joined the cluster)
 */
static int 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)
{
	struct ceph_entity_addr *myaddr = NULL;
	int err;
	unsigned long timeout = client->options->mount_timeout * HZ;

	/* initialize the messenger */
	if (client->msgr == NULL) {
		if (ceph_test_opt(client, MYIP))
			myaddr = &client->options->my_addr;
		client->msgr = ceph_messenger_create(myaddr,
					client->supported_features,
					client->required_features);
		if (IS_ERR(client->msgr)) {
			client->msgr = NULL;
			return PTR_ERR(client->msgr);
		}
		client->msgr->nocrc = ceph_test_opt(client, NOCRC);
	}

	/* 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)) {
		err = -EIO;
		if (timeout && time_after_eq(jiffies, started + timeout))
			return err;

		/* wait */
		dout("mount waiting for mon_map\n");
		err = wait_event_interruptible_timeout(client->auth_wq,
			have_mon_and_osd_map(client) || (client->auth_err < 0),
			timeout);
		if (err == -EINTR || err == -ERESTARTSYS)
			return err;
		if (client->auth_err < 0)
			return client->auth_err;
	}

	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\n");
	mutex_lock(&client->mount_mutex);

	ret = __ceph_open_session(client, started);

	mutex_unlock(&client->mount_mutex);
	return ret;
}
EXPORT_SYMBOL(ceph_open_session);


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

	ret = ceph_debugfs_init();
	if (ret < 0)
		goto out;

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

	pr_info("loaded (mon/osd proto %d/%d, osdmap %d/%d %d/%d)\n",
		CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL,
		CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
		CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);

	return 0;

out_debugfs:
	ceph_debugfs_cleanup();
out:
	return ret;
}

static void __exit exit_ceph_lib(void)
{
	dout("exit_ceph_lib\n");
	ceph_msgr_exit();
	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 filesystem for Linux");
MODULE_LICENSE("GPL");
Commit	Line	Data
3d14c5d2 YS	1
	2	#include <linux/ceph/ceph_debug.h>
	3	#include <linux/backing-dev.h>
	4	#include <linux/ctype.h>
	5	#include <linux/fs.h>
	6	#include <linux/inet.h>
	7	#include <linux/in6.h>
	8	#include <linux/module.h>
	9	#include <linux/mount.h>
	10	#include <linux/parser.h>
	11	#include <linux/sched.h>
	12	#include <linux/seq_file.h>
	13	#include <linux/slab.h>
	14	#include <linux/statfs.h>
	15	#include <linux/string.h>
	16
	17
	18	#include <linux/ceph/libceph.h>
	19	#include <linux/ceph/debugfs.h>
	20	#include <linux/ceph/decode.h>
	21	#include <linux/ceph/mon_client.h>
	22	#include <linux/ceph/auth.h>
	23
	24
	25
	26	/*
	27	* find filename portion of a path (/foo/bar/baz -> baz)
	28	*/
	29	const char ceph_file_part(const char s, int len)
	30	{
	31	const char *e = s + len;
	32
	33	while (e != s && *(e-1) != '/')
	34	e--;
	35	return e;
	36	}
	37	EXPORT_SYMBOL(ceph_file_part);
	38
	39	const char *ceph_msg_type_name(int type)
	40	{
	41	switch (type) {
	42	case CEPH_MSG_SHUTDOWN: return "shutdown";
	43	case CEPH_MSG_PING: return "ping";
	44	case CEPH_MSG_AUTH: return "auth";
	45	case CEPH_MSG_AUTH_REPLY: return "auth_reply";
	46	case CEPH_MSG_MON_MAP: return "mon_map";
	47	case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
	48	case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
	49	case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
	50	case CEPH_MSG_STATFS: return "statfs";
	51	case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
	52	case CEPH_MSG_MDS_MAP: return "mds_map";
	53	case CEPH_MSG_CLIENT_SESSION: return "client_session";
	54	case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
	55	case CEPH_MSG_CLIENT_REQUEST: return "client_request";
	56	case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
	57	case CEPH_MSG_CLIENT_REPLY: return "client_reply";
	58	case CEPH_MSG_CLIENT_CAPS: return "client_caps";
	59	case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
	60	case CEPH_MSG_CLIENT_SNAP: return "client_snap";
	61	case CEPH_MSG_CLIENT_LEASE: return "client_lease";
	62	case CEPH_MSG_OSD_MAP: return "osd_map";
	63	case CEPH_MSG_OSD_OP: return "osd_op";
	64	case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
65	default: return "unknown";
66	}
67	}
68	EXPORT_SYMBOL(ceph_msg_type_name);
69
70	/*
71	* Initially learn our fsid, or verify an fsid matches.
72	*/
73	int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid)
74	{
75	if (client->have_fsid) {
76	if (ceph_fsid_compare(&client->fsid, fsid)) {
77	pr_err("bad fsid, had %pU got %pU",
78	&client->fsid, fsid);
79	return -1;
80	}
81	} else {
82	pr_info("client%lld fsid %pU\n", ceph_client_id(client), fsid);
83	memcpy(&client->fsid, fsid, sizeof(*fsid));
84	ceph_debugfs_client_init(client);
85	client->have_fsid = true;
86	}
87	return 0;
88	}
89	EXPORT_SYMBOL(ceph_check_fsid);
90
91	static int strcmp_null(const char s1, const char s2)
92	{
93	if (!s1 && !s2)
94	return 0;
95	if (s1 && !s2)
96	return -1;
97	if (!s1 && s2)
98	return 1;
99	return strcmp(s1, s2);
100	}
101
102	int ceph_compare_options(struct ceph_options *new_opt,
103	struct ceph_client *client)
104	{
105	struct ceph_options *opt1 = new_opt;
106	struct ceph_options *opt2 = client->options;
107	int ofs = offsetof(struct ceph_options, mon_addr);
108	int i;
109	int ret;
110
111	ret = memcmp(opt1, opt2, ofs);
112	if (ret)
113	return ret;
114
115	ret = strcmp_null(opt1->name, opt2->name);
116	if (ret)
117	return ret;
118
119	ret = strcmp_null(opt1->secret, opt2->secret);
120	if (ret)
121	return ret;
122
123	/* any matching mon ip implies a match */
124	for (i = 0; i < opt1->num_mon; i++) {
125	if (ceph_monmap_contains(client->monc.monmap,
126	&opt1->mon_addr[i]))
127	return 0;
128	}
129	return -1;
130	}
131	EXPORT_SYMBOL(ceph_compare_options);
132
133
134	static int parse_fsid(const char str, struct ceph_fsid fsid)
135	{
136	int i = 0;
137	char tmp[3];
138	int err = -EINVAL;
139	int d;
140
141	dout("parse_fsid '%s'\n", str);
142	tmp[2] = 0;
143	while (*str && i < 16) {
144	if (ispunct(*str)) {
145	str++;
146	continue;
147	}
148	if (!isxdigit(str[0]) \|\| !isxdigit(str[1]))
149	break;
150	tmp[0] = str[0];
151	tmp[1] = str[1];
152	if (sscanf(tmp, "%x", &d) < 1)
153	break;
154	fsid->fsid[i] = d & 0xff;
155	i++;
156	str += 2;
157	}
158
159	if (i == 16)
160	err = 0;
161	dout("parse_fsid ret %d got fsid %pU", err, fsid);
162	return err;
163	}
164
165	/*
166	* ceph options
167	*/
168	enum {
169	Opt_osdtimeout,
170	Opt_osdkeepalivetimeout,
171	Opt_mount_timeout,
172	Opt_osd_idle_ttl,
173	Opt_last_int,
174	/* int args above */
175	Opt_fsid,
176	Opt_name,
177	Opt_secret,
178	Opt_ip,
179	Opt_last_string,
180	/* string args above */
181	Opt_noshare,
182	Opt_nocrc,
183	};
184
185	static match_table_t opt_tokens = {
186	{Opt_osdtimeout, "osdtimeout=%d"},
187	{Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
188	{Opt_mount_timeout, "mount_timeout=%d"},
189	{Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
190	/* int args above */
191	{Opt_fsid, "fsid=%s"},
192	{Opt_name, "name=%s"},
193	{Opt_secret, "secret=%s"},
194	{Opt_ip, "ip=%s"},
195	/* string args above */
196	{Opt_noshare, "noshare"},
197	{Opt_nocrc, "nocrc"},
198	{-1, NULL}
199	};
200
201	void ceph_destroy_options(struct ceph_options *opt)
202	{
203	dout("destroy_options %p\n", opt);
204	kfree(opt->name);
205	kfree(opt->secret);
206	kfree(opt);
207	}
208	EXPORT_SYMBOL(ceph_destroy_options);
209
210	int ceph_parse_options(struct ceph_options *popt, char options,
211	const char dev_name, const char dev_name_end,
212	int (parse_extra_token)(char c, void *private),
213	void *private)
214	{
215	struct ceph_options *opt;
216	const char *c;
217	int err = -ENOMEM;
218	substring_t argstr[MAX_OPT_ARGS];
219
220	opt = kzalloc(sizeof(*opt), GFP_KERNEL);
221	if (!opt)
222	return err;
223	opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
224	GFP_KERNEL);
225	if (!opt->mon_addr)
226	goto out;
227
228	dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
229	dev_name);
230
231	/* start with defaults */
232	opt->flags = CEPH_OPT_DEFAULT;
233	opt->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
234	opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
235	opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
236	opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
237
238	/* get mon ip(s) */
239	/* ip1[:port1][,ip2[:port2]...] */
240	err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
241	CEPH_MAX_MON, &opt->num_mon);
242	if (err < 0)
243	goto out;
244
245	/* parse mount options */
246	while ((c = strsep(&options, ",")) != NULL) {
247	int token, intval, ret;
248	if (!*c)
249	continue;
250	err = -EINVAL;
251	token = match_token((char *)c, opt_tokens, argstr);
010e3b48	252	if (token < 0 && parse_extra_token) {
3d14c5d2 YS	253	/* extra? */
	254	err = parse_extra_token((char *)c, private);
	255	if (err < 0) {
	256	pr_err("bad option at '%s'\n", c);
	257	goto out;
	258	}
	259	continue;
	260	}
	261	if (token < Opt_last_int) {
	262	ret = match_int(&argstr[0], &intval);
	263	if (ret < 0) {
	264	pr_err("bad mount option arg (not int) "
	265	"at '%s'\n", c);
	266	continue;
	267	}
	268	dout("got int token %d val %d\n", token, intval);
	269	} else if (token > Opt_last_int && token < Opt_last_string) {
	270	dout("got string token %d val %s\n", token,
	271	argstr[0].from);
	272	} else {
	273	dout("got token %d\n", token);
	274	}
	275	switch (token) {
	276	case Opt_ip:
	277	err = ceph_parse_ips(argstr[0].from,
	278	argstr[0].to,
	279	&opt->my_addr,
	280	1, NULL);
	281	if (err < 0)
	282	goto out;
	283	opt->flags \|= CEPH_OPT_MYIP;
	284	break;
	285
	286	case Opt_fsid:
	287	err = parse_fsid(argstr[0].from, &opt->fsid);
	288	if (err == 0)
	289	opt->flags \|= CEPH_OPT_FSID;
	290	break;
	291	case Opt_name:
	292	opt->name = kstrndup(argstr[0].from,
	293	argstr[0].to-argstr[0].from,
	294	GFP_KERNEL);
	295	break;
	296	case Opt_secret:
	297	opt->secret = kstrndup(argstr[0].from,
	298	argstr[0].to-argstr[0].from,
	299	GFP_KERNEL);
	300	break;
	301
	302	/* misc */
	303	case Opt_osdtimeout:
	304	opt->osd_timeout = intval;
	305	break;
	306	case Opt_osdkeepalivetimeout:
	307	opt->osd_keepalive_timeout = intval;
	308	break;
	309	case Opt_osd_idle_ttl:
	310	opt->osd_idle_ttl = intval;
	311	break;
	312	case Opt_mount_timeout:
	313	opt->mount_timeout = intval;
	314	break;
	315
	316	case Opt_noshare:
317	opt->flags \|= CEPH_OPT_NOSHARE;
318	break;
319
320	case Opt_nocrc:
321	opt->flags \|= CEPH_OPT_NOCRC;
322	break;
323
324	default:
325	BUG_ON(token);
326	}
327	}
328
329	/* success */
330	*popt = opt;
331	return 0;
332
333	out:
334	ceph_destroy_options(opt);
335	return err;
336	}
337	EXPORT_SYMBOL(ceph_parse_options);
338
339	u64 ceph_client_id(struct ceph_client *client)
340	{
341	return client->monc.auth->global_id;
342	}
343	EXPORT_SYMBOL(ceph_client_id);
344
345	/*
346	* create a fresh client instance
347	*/
348	struct ceph_client ceph_create_client(struct ceph_options opt, void *private)
349	{
350	struct ceph_client *client;
351	int err = -ENOMEM;
352
353	client = kzalloc(sizeof(*client), GFP_KERNEL);
354	if (client == NULL)
355	return ERR_PTR(-ENOMEM);
356
357	client->private = private;
358	client->options = opt;
359
360	mutex_init(&client->mount_mutex);
361	init_waitqueue_head(&client->auth_wq);
362	client->auth_err = 0;
363
364	client->extra_mon_dispatch = NULL;
365	client->supported_features = CEPH_FEATURE_SUPPORTED_DEFAULT;
366	client->required_features = CEPH_FEATURE_REQUIRED_DEFAULT;
367
368	client->msgr = NULL;
369
370	/* subsystems */
371	err = ceph_monc_init(&client->monc, client);
372	if (err < 0)
373	goto fail;
374	err = ceph_osdc_init(&client->osdc, client);
375	if (err < 0)
376	goto fail_monc;
377
378	return client;
379
380	fail_monc:
381	ceph_monc_stop(&client->monc);
382	fail:
383	kfree(client);
384	return ERR_PTR(err);
385	}
386	EXPORT_SYMBOL(ceph_create_client);
387
388	void ceph_destroy_client(struct ceph_client *client)
389	{
390	dout("destroy_client %p\n", client);
391
392	/* unmount */
393	ceph_osdc_stop(&client->osdc);
394
395	/*
396	* make sure mds and osd connections close out before destroying
397	* the auth module, which is needed to free those connections'
398	* ceph_authorizers.
399	*/
400	ceph_msgr_flush();
401
402	ceph_monc_stop(&client->monc);
403
404	ceph_debugfs_client_cleanup(client);
405
406	if (client->msgr)
407	ceph_messenger_destroy(client->msgr);
408
409	ceph_destroy_options(client->options);
410
411	kfree(client);
412	dout("destroy_client %p done\n", client);
413	}
414	EXPORT_SYMBOL(ceph_destroy_client);
415
416	/*
417	* true if we have the mon map (and have thus joined the cluster)
418	*/
419	static int have_mon_and_osd_map(struct ceph_client *client)
420	{
421	return client->monc.monmap && client->monc.monmap->epoch &&
422	client->osdc.osdmap && client->osdc.osdmap->epoch;
423	}
424
425	/*
426	* mount: join the ceph cluster, and open root directory.
427	*/
428	int __ceph_open_session(struct ceph_client *client, unsigned long started)
429	{
430	struct ceph_entity_addr *myaddr = NULL;
431	int err;
432	unsigned long timeout = client->options->mount_timeout * HZ;
433
434	/* initialize the messenger */
435	if (client->msgr == NULL) {
436	if (ceph_test_opt(client, MYIP))
437	myaddr = &client->options->my_addr;
438	client->msgr = ceph_messenger_create(myaddr,
439	client->supported_features,
440	client->required_features);
441	if (IS_ERR(client->msgr)) {
442	client->msgr = NULL;
443	return PTR_ERR(client->msgr);
444	}
445	client->msgr->nocrc = ceph_test_opt(client, NOCRC);
446	}
447
448	/* open session, and wait for mon and osd maps */
449	err = ceph_monc_open_session(&client->monc);
450	if (err < 0)
451	return err;
452
453	while (!have_mon_and_osd_map(client)) {
454	err = -EIO;
455	if (timeout && time_after_eq(jiffies, started + timeout))
456	return err;
457
458	/* wait */
459	dout("mount waiting for mon_map\n");
460	err = wait_event_interruptible_timeout(client->auth_wq,
461	have_mon_and_osd_map(client) \|\| (client->auth_err < 0),
462	timeout);
463	if (err == -EINTR \|\| err == -ERESTARTSYS)
464	return err;
465	if (client->auth_err < 0)
466	return client->auth_err;
467	}
468
469	return 0;
470	}
471	EXPORT_SYMBOL(__ceph_open_session);
472
473
474	int ceph_open_session(struct ceph_client *client)
475	{
476	int ret;
477	unsigned long started = jiffies; /* note the start time */
478
479	dout("open_session start\n");
480	mutex_lock(&client->mount_mutex);
481
482	ret = __ceph_open_session(client, started);
483
484	mutex_unlock(&client->mount_mutex);
485	return ret;
486	}
487	EXPORT_SYMBOL(ceph_open_session);
488
489
490	static int __init init_ceph_lib(void)
491	{
492	int ret = 0;
493
494	ret = ceph_debugfs_init();
495	if (ret < 0)
496	goto out;
497
498	ret = ceph_msgr_init();
499	if (ret < 0)
500	goto out_debugfs;
501
502	pr_info("loaded (mon/osd proto %d/%d, osdmap %d/%d %d/%d)\n",
503	CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL,
504	CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
505	CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
506
507	return 0;
508
509	out_debugfs:
510	ceph_debugfs_cleanup();
511	out:
512	return ret;
513	}
514
515	static void __exit exit_ceph_lib(void)
516	{
517	dout("exit_ceph_lib\n");
518	ceph_msgr_exit();
519	ceph_debugfs_cleanup();
520	}
521
522	module_init(init_ceph_lib);
523	module_exit(exit_ceph_lib);
524
525	MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
526	MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
527	MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
528	MODULE_DESCRIPTION("Ceph filesystem for Linux");
529	MODULE_LICENSE("GPL");