[deliverable/linux.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/key.h>
#include <keys/ceph-type.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/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"


/*
 * 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";
	case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
	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;

	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;
		}
	}

	/* 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_key,
	Opt_ip,
	Opt_last_string,
	/* string args above */
	Opt_share,
	Opt_noshare,
	Opt_crc,
	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_key, "key=%s"},
	{Opt_ip, "ip=%s"},
	/* string args above */
	{Opt_share, "share"},
	{Opt_noshare, "noshare"},
	{Opt_crc, "crc"},
	{Opt_nocrc, "nocrc"},
	{-1, NULL}
};

void ceph_destroy_options(struct ceph_options *opt)
{
	dout("destroy_options %p\n", opt);
	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 key *ukey;
	int key_err;
	int err = 0;
	struct ceph_crypto_key *ckey;

	ukey = request_key(&key_type_ceph, name, NULL);
	if (!ukey || 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:
			pr_warning("ceph: Mount failed due to key not found: %s\n", name);
			break;
		case -EKEYEXPIRED:
			pr_warning("ceph: Mount failed due to expired key: %s\n", name);
			break;
		case -EKEYREVOKED:
			pr_warning("ceph: Mount failed due to revoked key: %s\n", name);
			break;
		default:
			pr_warning("ceph: Mount failed due to unknown key error"
			       " %d: %s\n", key_err, name);
		}
		err = -EPERM;
		goto out;
	}

	ckey = ukey->payload.data;
	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;
}

struct ceph_options *
ceph_parse_options(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_PTR(-ENOMEM);
	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_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->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
			if (!opt->key) {
				err = -ENOMEM;
				goto out;
			}
			err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
			if (err < 0)
				goto out;
			break;
		case Opt_key:
		        opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
			if (!opt->key) {
				err = -ENOMEM;
				goto out;
			}
			err = get_secret(opt->key, argstr[0].from);
			if (err < 0)
				goto out;
			break;

			/* misc */
		case Opt_osdtimeout:
			pr_warning("ignoring deprecated osdtimeout option\n");
			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_share:
			opt->flags &= ~CEPH_OPT_NOSHARE;
			break;
		case Opt_noshare:
			opt->flags |= CEPH_OPT_NOSHARE;
			break;

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

		default:
			BUG_ON(token);
		}
	}

	/* success */
	return opt;

out:
	ceph_destroy_options(opt);
	return ERR_PTR(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,
				       unsigned int supported_features,
				       unsigned int required_features)
{
	struct ceph_client *client;
	struct ceph_entity_addr *myaddr = NULL;
	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_FEATURES_SUPPORTED_DEFAULT |
		supported_features;
	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT |
		required_features;

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

	/* 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);

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

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

	ceph_monc_stop(&client->monc);

	ceph_debugfs_client_cleanup(client);

	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)
{
	int err;
	unsigned long timeout = client->options->mount_timeout * HZ;

	/* 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_crypto_init();
	if (ret < 0)
		goto out_debugfs;

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

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

static void __exit exit_ceph_lib(void)
{
	dout("exit_ceph_lib\n");
	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 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>
e2c3d29b	8	#include <linux/key.h>
4b2a58ab	9	#include <keys/ceph-type.h>
3d14c5d2 YS	10	#include <linux/module.h>
	11	#include <linux/mount.h>
	12	#include <linux/parser.h>
	13	#include <linux/sched.h>
	14	#include <linux/seq_file.h>
	15	#include <linux/slab.h>
	16	#include <linux/statfs.h>
	17	#include <linux/string.h>
	18
	19
1fe60e51	20	#include <linux/ceph/ceph_features.h>
3d14c5d2 YS	21	#include <linux/ceph/libceph.h>
	22	#include <linux/ceph/debugfs.h>
	23	#include <linux/ceph/decode.h>
	24	#include <linux/ceph/mon_client.h>
	25	#include <linux/ceph/auth.h>
8323c3aa	26	#include "crypto.h"
3d14c5d2 YS	27
	28
	29
	30	/*
	31	* find filename portion of a path (/foo/bar/baz -> baz)
	32	*/
	33	const char ceph_file_part(const char s, int len)
	34	{
	35	const char *e = s + len;
	36
	37	while (e != s && *(e-1) != '/')
	38	e--;
	39	return e;
	40	}
	41	EXPORT_SYMBOL(ceph_file_part);
	42
	43	const char *ceph_msg_type_name(int type)
	44	{
	45	switch (type) {
	46	case CEPH_MSG_SHUTDOWN: return "shutdown";
	47	case CEPH_MSG_PING: return "ping";
	48	case CEPH_MSG_AUTH: return "auth";
	49	case CEPH_MSG_AUTH_REPLY: return "auth_reply";
	50	case CEPH_MSG_MON_MAP: return "mon_map";
	51	case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
	52	case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
	53	case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
	54	case CEPH_MSG_STATFS: return "statfs";
	55	case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
	56	case CEPH_MSG_MDS_MAP: return "mds_map";
	57	case CEPH_MSG_CLIENT_SESSION: return "client_session";
	58	case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
	59	case CEPH_MSG_CLIENT_REQUEST: return "client_request";
	60	case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
	61	case CEPH_MSG_CLIENT_REPLY: return "client_reply";
	62	case CEPH_MSG_CLIENT_CAPS: return "client_caps";
	63	case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
	64	case CEPH_MSG_CLIENT_SNAP: return "client_snap";
	65	case CEPH_MSG_CLIENT_LEASE: return "client_lease";
	66	case CEPH_MSG_OSD_MAP: return "osd_map";
	67	case CEPH_MSG_OSD_OP: return "osd_op";
	68	case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
a40c4f10	69	case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
3d14c5d2 YS	70	default: return "unknown";
	71	}
	72	}
	73	EXPORT_SYMBOL(ceph_msg_type_name);
	74
	75	/*
	76	* Initially learn our fsid, or verify an fsid matches.
	77	*/
	78	int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid)
	79	{
	80	if (client->have_fsid) {
	81	if (ceph_fsid_compare(&client->fsid, fsid)) {
	82	pr_err("bad fsid, had %pU got %pU",
	83	&client->fsid, fsid);
	84	return -1;
	85	}
	86	} else {
3d14c5d2	87	memcpy(&client->fsid, fsid, sizeof(*fsid));
3d14c5d2 YS	88	}
	89	return 0;
	90	}
	91	EXPORT_SYMBOL(ceph_check_fsid);
	92
	93	static int strcmp_null(const char s1, const char s2)
	94	{
	95	if (!s1 && !s2)
	96	return 0;
	97	if (s1 && !s2)
	98	return -1;
	99	if (!s1 && s2)
	100	return 1;
	101	return strcmp(s1, s2);
	102	}
	103
	104	int ceph_compare_options(struct ceph_options *new_opt,
	105	struct ceph_client *client)
	106	{
	107	struct ceph_options *opt1 = new_opt;
	108	struct ceph_options *opt2 = client->options;
	109	int ofs = offsetof(struct ceph_options, mon_addr);
	110	int i;
	111	int ret;
	112
	113	ret = memcmp(opt1, opt2, ofs);
	114	if (ret)
	115	return ret;
	116
	117	ret = strcmp_null(opt1->name, opt2->name);
	118	if (ret)
	119	return ret;
	120
8323c3aa TV	121	if (opt1->key && !opt2->key)
	122	return -1;
	123	if (!opt1->key && opt2->key)
	124	return 1;
	125	if (opt1->key && opt2->key) {
	126	if (opt1->key->type != opt2->key->type)
	127	return -1;
	128	if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
	129	return -1;
	130	if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
	131	return -1;
	132	if (opt1->key->len != opt2->key->len)
	133	return -1;
	134	if (opt1->key->key && !opt2->key->key)
	135	return -1;
	136	if (!opt1->key->key && opt2->key->key)
	137	return 1;
	138	if (opt1->key->key && opt2->key->key) {
	139	ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
	140	if (ret)
	141	return ret;
	142	}
	143	}
3d14c5d2 YS	144
	145	/* any matching mon ip implies a match */
	146	for (i = 0; i < opt1->num_mon; i++) {
	147	if (ceph_monmap_contains(client->monc.monmap,
	148	&opt1->mon_addr[i]))
	149	return 0;
	150	}
	151	return -1;
	152	}
	153	EXPORT_SYMBOL(ceph_compare_options);
	154
	155
	156	static int parse_fsid(const char str, struct ceph_fsid fsid)
	157	{
	158	int i = 0;
	159	char tmp[3];
	160	int err = -EINVAL;
	161	int d;
	162
	163	dout("parse_fsid '%s'\n", str);
	164	tmp[2] = 0;
	165	while (*str && i < 16) {
	166	if (ispunct(*str)) {
	167	str++;
	168	continue;
	169	}
	170	if (!isxdigit(str[0]) \|\| !isxdigit(str[1]))
	171	break;
	172	tmp[0] = str[0];
	173	tmp[1] = str[1];
	174	if (sscanf(tmp, "%x", &d) < 1)
	175	break;
	176	fsid->fsid[i] = d & 0xff;
	177	i++;
	178	str += 2;
	179	}
	180
	181	if (i == 16)
	182	err = 0;
	183	dout("parse_fsid ret %d got fsid %pU", err, fsid);
	184	return err;
	185	}
	186
	187	/*
	188	* ceph options
	189	*/
	190	enum {
	191	Opt_osdtimeout,
	192	Opt_osdkeepalivetimeout,
	193	Opt_mount_timeout,
	194	Opt_osd_idle_ttl,
	195	Opt_last_int,
	196	/* int args above */
	197	Opt_fsid,
	198	Opt_name,
	199	Opt_secret,
e2c3d29b	200	Opt_key,
3d14c5d2 YS	201	Opt_ip,
	202	Opt_last_string,
	203	/* string args above */
cffaba15	204	Opt_share,
3d14c5d2	205	Opt_noshare,
cffaba15	206	Opt_crc,
3d14c5d2 YS	207	Opt_nocrc,
	208	};
	209
	210	static match_table_t opt_tokens = {
	211	{Opt_osdtimeout, "osdtimeout=%d"},
	212	{Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
	213	{Opt_mount_timeout, "mount_timeout=%d"},
	214	{Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
	215	/* int args above */
	216	{Opt_fsid, "fsid=%s"},
	217	{Opt_name, "name=%s"},
	218	{Opt_secret, "secret=%s"},
e2c3d29b	219	{Opt_key, "key=%s"},
3d14c5d2 YS	220	{Opt_ip, "ip=%s"},
3d14c5d2 YS	221	/* string args above */
cffaba15	222	{Opt_share, "share"},
3d14c5d2	223	{Opt_noshare, "noshare"},
cffaba15	224	{Opt_crc, "crc"},
3d14c5d2 YS	225	{Opt_nocrc, "nocrc"},
	226	{-1, NULL}
	227	};
	228
	229	void ceph_destroy_options(struct ceph_options *opt)
	230	{
	231	dout("destroy_options %p\n", opt);
	232	kfree(opt->name);
8323c3aa TV	233	if (opt->key) {
	234	ceph_crypto_key_destroy(opt->key);
	235	kfree(opt->key);
	236	}
1cad7893	237	kfree(opt->mon_addr);
3d14c5d2 YS	238	kfree(opt);
	239	}
	240	EXPORT_SYMBOL(ceph_destroy_options);
	241
e2c3d29b TV	242	/* get secret from key store */
	243	static int get_secret(struct ceph_crypto_key dst, const char name) {
	244	struct key *ukey;
	245	int key_err;
	246	int err = 0;
4b2a58ab	247	struct ceph_crypto_key *ckey;
e2c3d29b	248
4b2a58ab	249	ukey = request_key(&key_type_ceph, name, NULL);
e2c3d29b TV	250	if (!ukey \|\| IS_ERR(ukey)) {
	251	/* request_key errors don't map nicely to mount(2)
	252	errors; don't even try, but still printk */
	253	key_err = PTR_ERR(ukey);
	254	switch (key_err) {
	255	case -ENOKEY:
	256	pr_warning("ceph: Mount failed due to key not found: %s\n", name);
	257	break;
	258	case -EKEYEXPIRED:
	259	pr_warning("ceph: Mount failed due to expired key: %s\n", name);
	260	break;
	261	case -EKEYREVOKED:
	262	pr_warning("ceph: Mount failed due to revoked key: %s\n", name);
	263	break;
	264	default:
	265	pr_warning("ceph: Mount failed due to unknown key error"
	266	" %d: %s\n", key_err, name);
	267	}
	268	err = -EPERM;
	269	goto out;
	270	}
	271
4b2a58ab TV	272	ckey = ukey->payload.data;
4b2a58ab TV	273	err = ceph_crypto_key_clone(dst, ckey);
e2c3d29b TV	274	if (err)
	275	goto out_key;
	276	/* pass through, err is 0 */
	277
	278	out_key:
	279	key_put(ukey);
	280	out:
	281	return err;
	282	}
	283
ee57741c AE	284	struct ceph_options *
	285	ceph_parse_options(char options, const char dev_name,
	286	const char *dev_name_end,
	287	int (parse_extra_token)(char c, void *private),
	288	void *private)
3d14c5d2 YS	289	{
	290	struct ceph_options *opt;
	291	const char *c;
	292	int err = -ENOMEM;
	293	substring_t argstr[MAX_OPT_ARGS];
	294
	295	opt = kzalloc(sizeof(*opt), GFP_KERNEL);
	296	if (!opt)
ee57741c	297	return ERR_PTR(-ENOMEM);
3d14c5d2 YS	298	opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
	299	GFP_KERNEL);
	300	if (!opt->mon_addr)
	301	goto out;
	302
	303	dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
	304	dev_name);
	305
	306	/* start with defaults */
	307	opt->flags = CEPH_OPT_DEFAULT;
3d14c5d2 YS	308	opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
	309	opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
	310	opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
	311
	312	/* get mon ip(s) */
	313	/* ip1[:port1][,ip2[:port2]...] */
	314	err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
	315	CEPH_MAX_MON, &opt->num_mon);
	316	if (err < 0)
	317	goto out;
	318
	319	/* parse mount options */
	320	while ((c = strsep(&options, ",")) != NULL) {
	321	int token, intval, ret;
	322	if (!*c)
	323	continue;
	324	err = -EINVAL;
	325	token = match_token((char *)c, opt_tokens, argstr);
010e3b48	326	if (token < 0 && parse_extra_token) {
3d14c5d2 YS	327	/* extra? */
	328	err = parse_extra_token((char *)c, private);
	329	if (err < 0) {
	330	pr_err("bad option at '%s'\n", c);
	331	goto out;
	332	}
	333	continue;
	334	}
	335	if (token < Opt_last_int) {
	336	ret = match_int(&argstr[0], &intval);
	337	if (ret < 0) {
	338	pr_err("bad mount option arg (not int) "
	339	"at '%s'\n", c);
	340	continue;
	341	}
	342	dout("got int token %d val %d\n", token, intval);
	343	} else if (token > Opt_last_int && token < Opt_last_string) {
	344	dout("got string token %d val %s\n", token,
	345	argstr[0].from);
	346	} else {
	347	dout("got token %d\n", token);
	348	}
	349	switch (token) {
	350	case Opt_ip:
	351	err = ceph_parse_ips(argstr[0].from,
	352	argstr[0].to,
	353	&opt->my_addr,
	354	1, NULL);
	355	if (err < 0)
	356	goto out;
	357	opt->flags \|= CEPH_OPT_MYIP;
	358	break;
	359
	360	case Opt_fsid:
	361	err = parse_fsid(argstr[0].from, &opt->fsid);
	362	if (err == 0)
	363	opt->flags \|= CEPH_OPT_FSID;
	364	break;
	365	case Opt_name:
	366	opt->name = kstrndup(argstr[0].from,
	367	argstr[0].to-argstr[0].from,
	368	GFP_KERNEL);
	369	break;
	370	case Opt_secret:
8323c3aa TV	371	opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
	372	if (!opt->key) {
	373	err = -ENOMEM;
	374	goto out;
	375	}
	376	err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
	377	if (err < 0)
	378	goto out;
3d14c5d2	379	break;
e2c3d29b TV	380	case Opt_key:
	381	opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
	382	if (!opt->key) {
	383	err = -ENOMEM;
	384	goto out;
	385	}
	386	err = get_secret(opt->key, argstr[0].from);
	387	if (err < 0)
	388	goto out;
	389	break;
3d14c5d2 YS	390
	391	/* misc */
	392	case Opt_osdtimeout:
83aff95e	393	pr_warning("ignoring deprecated osdtimeout option\n");
3d14c5d2 YS	394	break;
	395	case Opt_osdkeepalivetimeout:
	396	opt->osd_keepalive_timeout = intval;
	397	break;
	398	case Opt_osd_idle_ttl:
	399	opt->osd_idle_ttl = intval;
	400	break;
	401	case Opt_mount_timeout:
	402	opt->mount_timeout = intval;
	403	break;
	404
cffaba15 AE	405	case Opt_share:
	406	opt->flags &= ~CEPH_OPT_NOSHARE;
	407	break;
3d14c5d2 YS	408	case Opt_noshare:
	409	opt->flags \|= CEPH_OPT_NOSHARE;
	410	break;
	411
cffaba15 AE	412	case Opt_crc:
	413	opt->flags &= ~CEPH_OPT_NOCRC;
	414	break;
3d14c5d2 YS	415	case Opt_nocrc:
	416	opt->flags \|= CEPH_OPT_NOCRC;
	417	break;
	418
	419	default:
	420	BUG_ON(token);
	421	}
	422	}
	423
	424	/* success */
ee57741c	425	return opt;
3d14c5d2 YS	426
	427	out:
	428	ceph_destroy_options(opt);
ee57741c	429	return ERR_PTR(err);
3d14c5d2 YS	430	}
	431	EXPORT_SYMBOL(ceph_parse_options);
	432
	433	u64 ceph_client_id(struct ceph_client *client)
	434	{
	435	return client->monc.auth->global_id;
	436	}
	437	EXPORT_SYMBOL(ceph_client_id);
	438
	439	/*
	440	* create a fresh client instance
	441	*/
6ab00d46	442	struct ceph_client ceph_create_client(struct ceph_options opt, void *private,
95c96174 ED	443	unsigned int supported_features,
95c96174 ED	444	unsigned int required_features)
3d14c5d2 YS	445	{
3d14c5d2 YS	446	struct ceph_client *client;
6ab00d46	447	struct ceph_entity_addr *myaddr = NULL;
3d14c5d2 YS	448	int err = -ENOMEM;
	449
	450	client = kzalloc(sizeof(*client), GFP_KERNEL);
	451	if (client == NULL)
	452	return ERR_PTR(-ENOMEM);
	453
	454	client->private = private;
	455	client->options = opt;
	456
	457	mutex_init(&client->mount_mutex);
	458	init_waitqueue_head(&client->auth_wq);
	459	client->auth_err = 0;
	460
	461	client->extra_mon_dispatch = NULL;
1fe60e51	462	client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT \|
6ab00d46	463	supported_features;
1fe60e51	464	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT \|
6ab00d46 SW	465	required_features;
	466
	467	/* msgr */
	468	if (ceph_test_opt(client, MYIP))
	469	myaddr = &client->options->my_addr;
15d9882c AE	470	ceph_messenger_init(&client->msgr, myaddr,
	471	client->supported_features,
	472	client->required_features,
	473	ceph_test_opt(client, NOCRC));
3d14c5d2 YS	474
	475	/* subsystems */
	476	err = ceph_monc_init(&client->monc, client);
	477	if (err < 0)
15d9882c	478	goto fail;
3d14c5d2 YS	479	err = ceph_osdc_init(&client->osdc, client);
	480	if (err < 0)
	481	goto fail_monc;
	482
	483	return client;
	484
	485	fail_monc:
	486	ceph_monc_stop(&client->monc);
	487	fail:
	488	kfree(client);
	489	return ERR_PTR(err);
	490	}
	491	EXPORT_SYMBOL(ceph_create_client);
	492
	493	void ceph_destroy_client(struct ceph_client *client)
	494	{
	495	dout("destroy_client %p\n", client);
	496
a2a32584 GH	497	atomic_set(&client->msgr.stopping, 1);
a2a32584 GH	498
3d14c5d2 YS	499	/* unmount */
	500	ceph_osdc_stop(&client->osdc);
	501
3d14c5d2 YS	502	ceph_monc_stop(&client->monc);
	503
	504	ceph_debugfs_client_cleanup(client);
	505
3d14c5d2 YS	506	ceph_destroy_options(client->options);
	507
	508	kfree(client);
	509	dout("destroy_client %p done\n", client);
	510	}
	511	EXPORT_SYMBOL(ceph_destroy_client);
	512
	513	/*
	514	* true if we have the mon map (and have thus joined the cluster)
	515	*/
	516	static int have_mon_and_osd_map(struct ceph_client *client)
	517	{
	518	return client->monc.monmap && client->monc.monmap->epoch &&
	519	client->osdc.osdmap && client->osdc.osdmap->epoch;
	520	}
	521
	522	/*
	523	* mount: join the ceph cluster, and open root directory.
	524	*/
	525	int __ceph_open_session(struct ceph_client *client, unsigned long started)
	526	{
3d14c5d2 YS	527	int err;
	528	unsigned long timeout = client->options->mount_timeout * HZ;
	529
3d14c5d2 YS	530	/* open session, and wait for mon and osd maps */
	531	err = ceph_monc_open_session(&client->monc);
	532	if (err < 0)
	533	return err;
	534
	535	while (!have_mon_and_osd_map(client)) {
	536	err = -EIO;
	537	if (timeout && time_after_eq(jiffies, started + timeout))
	538	return err;
	539
	540	/* wait */
	541	dout("mount waiting for mon_map\n");
	542	err = wait_event_interruptible_timeout(client->auth_wq,
	543	have_mon_and_osd_map(client) \|\| (client->auth_err < 0),
	544	timeout);
	545	if (err == -EINTR \|\| err == -ERESTARTSYS)
	546	return err;
	547	if (client->auth_err < 0)
	548	return client->auth_err;
	549	}
	550
	551	return 0;
	552	}
	553	EXPORT_SYMBOL(__ceph_open_session);
	554
	555
	556	int ceph_open_session(struct ceph_client *client)
	557	{
	558	int ret;
	559	unsigned long started = jiffies; /* note the start time */
	560
	561	dout("open_session start\n");
	562	mutex_lock(&client->mount_mutex);
	563
	564	ret = __ceph_open_session(client, started);
	565
	566	mutex_unlock(&client->mount_mutex);
	567	return ret;
	568	}
	569	EXPORT_SYMBOL(ceph_open_session);
	570
	571
	572	static int __init init_ceph_lib(void)
	573	{
	574	int ret = 0;
	575
	576	ret = ceph_debugfs_init();
	577	if (ret < 0)
	578	goto out;
	579
4b2a58ab	580	ret = ceph_crypto_init();
3d14c5d2 YS	581	if (ret < 0)
	582	goto out_debugfs;
	583
4b2a58ab TV	584	ret = ceph_msgr_init();
	585	if (ret < 0)
	586	goto out_crypto;
	587
3d14c5d2 YS	588	pr_info("loaded (mon/osd proto %d/%d, osdmap %d/%d %d/%d)\n",
	589	CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL,
	590	CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
	591	CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
	592
	593	return 0;
	594
4b2a58ab TV	595	out_crypto:
4b2a58ab TV	596	ceph_crypto_shutdown();
3d14c5d2 YS	597	out_debugfs:
	598	ceph_debugfs_cleanup();
	599	out:
	600	return ret;
	601	}
	602
	603	static void __exit exit_ceph_lib(void)
	604	{
	605	dout("exit_ceph_lib\n");
	606	ceph_msgr_exit();
4b2a58ab	607	ceph_crypto_shutdown();
3d14c5d2 YS	608	ceph_debugfs_cleanup();
	609	}
	610
	611	module_init(init_ceph_lib);
	612	module_exit(exit_ceph_lib);
	613
	614	MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
	615	MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
	616	MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
	617	MODULE_DESCRIPTION("Ceph filesystem for Linux");
	618	MODULE_LICENSE("GPL");