[deliverable/linux.git] / fs / 9p / v9fs.c

/*
 *  linux/fs/9p/v9fs.c
 *
 *  This file contains functions assisting in mapping VFS to 9P2000
 *
 *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/parser.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
#include "v9fs.h"
#include "v9fs_vfs.h"
#include "cache.h"

static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
static LIST_HEAD(v9fs_sessionlist);
struct kmem_cache *v9fs_inode_cache;

/*
 * Option Parsing (code inspired by NFS code)
 *  NOTE: each transport will parse its own options
 */

enum {
	/* Options that take integer arguments */
	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
	/* String options */
	Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
	/* Options that take no arguments */
	Opt_nodevmap,
	/* Cache options */
	Opt_cache_loose, Opt_fscache,
	/* Access options */
	Opt_access, Opt_posixacl,
	/* Error token */
	Opt_err
};

static const match_table_t tokens = {
	{Opt_debug, "debug=%x"},
	{Opt_dfltuid, "dfltuid=%u"},
	{Opt_dfltgid, "dfltgid=%u"},
	{Opt_afid, "afid=%u"},
	{Opt_uname, "uname=%s"},
	{Opt_remotename, "aname=%s"},
	{Opt_nodevmap, "nodevmap"},
	{Opt_cache, "cache=%s"},
	{Opt_cache_loose, "loose"},
	{Opt_fscache, "fscache"},
	{Opt_cachetag, "cachetag=%s"},
	{Opt_access, "access=%s"},
	{Opt_posixacl, "posixacl"},
	{Opt_err, NULL}
};

/* Interpret mount options for cache mode */
static int get_cache_mode(char *s)
{
	int version = -EINVAL;

	if (!strcmp(s, "loose")) {
		version = CACHE_LOOSE;
		P9_DPRINTK(P9_DEBUG_9P, "Cache mode: loose\n");
	} else if (!strcmp(s, "fscache")) {
		version = CACHE_FSCACHE;
		P9_DPRINTK(P9_DEBUG_9P, "Cache mode: fscache\n");
	} else if (!strcmp(s, "none")) {
		version = CACHE_NONE;
		P9_DPRINTK(P9_DEBUG_9P, "Cache mode: none\n");
	} else
		printk(KERN_INFO "9p: Unknown Cache mode %s.\n", s);
	return version;
}

/**
 * v9fs_parse_options - parse mount options into session structure
 * @v9ses: existing v9fs session information
 *
 * Return 0 upon success, -ERRNO upon failure.
 */

static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
{
	char *options, *tmp_options;
	substring_t args[MAX_OPT_ARGS];
	char *p;
	int option = 0;
	char *s, *e;
	int ret = 0;

	/* setup defaults */
	v9ses->afid = ~0;
	v9ses->debug = 0;
	v9ses->cache = CACHE_NONE;
#ifdef CONFIG_9P_FSCACHE
	v9ses->cachetag = NULL;
#endif

	if (!opts)
		return 0;

	tmp_options = kstrdup(opts, GFP_KERNEL);
	if (!tmp_options) {
		ret = -ENOMEM;
		goto fail_option_alloc;
	}
	options = tmp_options;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;
		token = match_token(p, tokens, args);
		if (token < Opt_uname) {
			int r = match_int(&args[0], &option);
			if (r < 0) {
				P9_DPRINTK(P9_DEBUG_ERROR,
					"integer field, but no integer?\n");
				ret = r;
				continue;
			}
		}
		switch (token) {
		case Opt_debug:
			v9ses->debug = option;
#ifdef CONFIG_NET_9P_DEBUG
			p9_debug_level = option;
#endif
			break;

		case Opt_dfltuid:
			v9ses->dfltuid = option;
			break;
		case Opt_dfltgid:
			v9ses->dfltgid = option;
			break;
		case Opt_afid:
			v9ses->afid = option;
			break;
		case Opt_uname:
			match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
			break;
		case Opt_remotename:
			match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
			break;
		case Opt_nodevmap:
			v9ses->nodev = 1;
			break;
		case Opt_cache_loose:
			v9ses->cache = CACHE_LOOSE;
			break;
		case Opt_fscache:
			v9ses->cache = CACHE_FSCACHE;
			break;
		case Opt_cachetag:
#ifdef CONFIG_9P_FSCACHE
			v9ses->cachetag = match_strdup(&args[0]);
#endif
			break;
		case Opt_cache:
			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
				P9_DPRINTK(P9_DEBUG_ERROR,
				  "problem allocating copy of cache arg\n");
				goto free_and_return;
			}
			ret = get_cache_mode(s);
			if (ret == -EINVAL) {
				kfree(s);
				goto free_and_return;
			}

			v9ses->cache = ret;
			kfree(s);
			break;

		case Opt_access:
			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
				P9_DPRINTK(P9_DEBUG_ERROR,
				  "problem allocating copy of access arg\n");
				goto free_and_return;
			}

			v9ses->flags &= ~V9FS_ACCESS_MASK;
			if (strcmp(s, "user") == 0)
				v9ses->flags |= V9FS_ACCESS_USER;
			else if (strcmp(s, "any") == 0)
				v9ses->flags |= V9FS_ACCESS_ANY;
			else if (strcmp(s, "client") == 0) {
				v9ses->flags |= V9FS_ACCESS_CLIENT;
			} else {
				v9ses->flags |= V9FS_ACCESS_SINGLE;
				v9ses->uid = simple_strtoul(s, &e, 10);
				if (*e != '\0') {
					ret = -EINVAL;
					printk(KERN_INFO "9p: Unknown access "
							"argument %s.\n", s);
					kfree(s);
					goto free_and_return;
				}
			}

			kfree(s);
			break;

		case Opt_posixacl:
#ifdef CONFIG_9P_FS_POSIX_ACL
			v9ses->flags |= V9FS_POSIX_ACL;
#else
			P9_DPRINTK(P9_DEBUG_ERROR,
					"Not defined CONFIG_9P_FS_POSIX_ACL. "
					"Ignoring posixacl option\n");
#endif
			break;

		default:
			continue;
		}
	}

free_and_return:
	kfree(tmp_options);
fail_option_alloc:
	return ret;
}

/**
 * v9fs_session_init - initialize session
 * @v9ses: session information structure
 * @dev_name: device being mounted
 * @data: options
 *
 */

struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
		  const char *dev_name, char *data)
{
	int retval = -EINVAL;
	struct p9_fid *fid;
	int rc;

	v9ses->uname = __getname();
	if (!v9ses->uname)
		return ERR_PTR(-ENOMEM);

	v9ses->aname = __getname();
	if (!v9ses->aname) {
		__putname(v9ses->uname);
		return ERR_PTR(-ENOMEM);
	}
	init_rwsem(&v9ses->rename_sem);

	rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
	if (rc) {
		__putname(v9ses->aname);
		__putname(v9ses->uname);
		return ERR_PTR(rc);
	}

	spin_lock(&v9fs_sessionlist_lock);
	list_add(&v9ses->slist, &v9fs_sessionlist);
	spin_unlock(&v9fs_sessionlist_lock);

	strcpy(v9ses->uname, V9FS_DEFUSER);
	strcpy(v9ses->aname, V9FS_DEFANAME);
	v9ses->uid = ~0;
	v9ses->dfltuid = V9FS_DEFUID;
	v9ses->dfltgid = V9FS_DEFGID;

	v9ses->clnt = p9_client_create(dev_name, data);
	if (IS_ERR(v9ses->clnt)) {
		retval = PTR_ERR(v9ses->clnt);
		v9ses->clnt = NULL;
		P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
		goto error;
	}

	v9ses->flags = V9FS_ACCESS_USER;

	if (p9_is_proto_dotl(v9ses->clnt)) {
		v9ses->flags = V9FS_ACCESS_CLIENT;
		v9ses->flags |= V9FS_PROTO_2000L;
	} else if (p9_is_proto_dotu(v9ses->clnt)) {
		v9ses->flags |= V9FS_PROTO_2000U;
	}

	rc = v9fs_parse_options(v9ses, data);
	if (rc < 0) {
		retval = rc;
		goto error;
	}

	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;

	if (!v9fs_proto_dotl(v9ses) &&
	    ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
		/*
		 * We support ACCESS_CLIENT only for dotl.
		 * Fall back to ACCESS_USER
		 */
		v9ses->flags &= ~V9FS_ACCESS_MASK;
		v9ses->flags |= V9FS_ACCESS_USER;
	}
	/*FIXME !! */
	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
	if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
		((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {

		v9ses->flags &= ~V9FS_ACCESS_MASK;
		v9ses->flags |= V9FS_ACCESS_ANY;
		v9ses->uid = ~0;
	}
	if (!v9fs_proto_dotl(v9ses) ||
		!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
		/*
		 * We support ACL checks on clinet only if the protocol is
		 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
		 */
		v9ses->flags &= ~V9FS_ACL_MASK;
	}

	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
							v9ses->aname);
	if (IS_ERR(fid)) {
		retval = PTR_ERR(fid);
		fid = NULL;
		P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
		goto error;
	}

	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
		fid->uid = v9ses->uid;
	else
		fid->uid = ~0;

#ifdef CONFIG_9P_FSCACHE
	/* register the session for caching */
	v9fs_cache_session_get_cookie(v9ses);
#endif

	return fid;

error:
	bdi_destroy(&v9ses->bdi);
	return ERR_PTR(retval);
}

/**
 * v9fs_session_close - shutdown a session
 * @v9ses: session information structure
 *
 */

void v9fs_session_close(struct v9fs_session_info *v9ses)
{
	if (v9ses->clnt) {
		p9_client_destroy(v9ses->clnt);
		v9ses->clnt = NULL;
	}

#ifdef CONFIG_9P_FSCACHE
	if (v9ses->fscache) {
		v9fs_cache_session_put_cookie(v9ses);
		kfree(v9ses->cachetag);
	}
#endif
	__putname(v9ses->uname);
	__putname(v9ses->aname);

	bdi_destroy(&v9ses->bdi);

	spin_lock(&v9fs_sessionlist_lock);
	list_del(&v9ses->slist);
	spin_unlock(&v9fs_sessionlist_lock);
}

/**
 * v9fs_session_cancel - terminate a session
 * @v9ses: session to terminate
 *
 * mark transport as disconnected and cancel all pending requests.
 */

void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
	p9_client_disconnect(v9ses->clnt);
}

/**
 * v9fs_session_begin_cancel - Begin terminate of a session
 * @v9ses: session to terminate
 *
 * After this call we don't allow any request other than clunk.
 */

void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
{
	P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
	p9_client_begin_disconnect(v9ses->clnt);
}

extern int v9fs_error_init(void);

static struct kobject *v9fs_kobj;

#ifdef CONFIG_9P_FSCACHE
/**
 * caches_show - list caches associated with a session
 *
 * Returns the size of buffer written.
 */

static ssize_t caches_show(struct kobject *kobj,
			   struct kobj_attribute *attr,
			   char *buf)
{
	ssize_t n = 0, count = 0, limit = PAGE_SIZE;
	struct v9fs_session_info *v9ses;

	spin_lock(&v9fs_sessionlist_lock);
	list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
		if (v9ses->cachetag) {
			n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
			if (n < 0) {
				count = n;
				break;
			}

			count += n;
			limit -= n;
		}
	}

	spin_unlock(&v9fs_sessionlist_lock);
	return count;
}

static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
#endif /* CONFIG_9P_FSCACHE */

static struct attribute *v9fs_attrs[] = {
#ifdef CONFIG_9P_FSCACHE
	&v9fs_attr_cache.attr,
#endif
	NULL,
};

static struct attribute_group v9fs_attr_group = {
	.attrs = v9fs_attrs,
};

/**
 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
 *
 */

static int v9fs_sysfs_init(void)
{
	v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
	if (!v9fs_kobj)
		return -ENOMEM;

	if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
		kobject_put(v9fs_kobj);
		return -ENOMEM;
	}

	return 0;
}

/**
 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
 *
 */

static void v9fs_sysfs_cleanup(void)
{
	sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
	kobject_put(v9fs_kobj);
}

static void v9fs_inode_init_once(void *foo)
{
	struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
#ifdef CONFIG_9P_FSCACHE
	v9inode->fscache = NULL;
#endif
	memset(&v9inode->qid, 0, sizeof(v9inode->qid));
	inode_init_once(&v9inode->vfs_inode);
}

/**
 * v9fs_init_inode_cache - initialize a cache for 9P
 * Returns 0 on success.
 */
static int v9fs_init_inode_cache(void)
{
	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
					  sizeof(struct v9fs_inode),
					  0, (SLAB_RECLAIM_ACCOUNT|
					      SLAB_MEM_SPREAD),
					  v9fs_inode_init_once);
	if (!v9fs_inode_cache)
		return -ENOMEM;

	return 0;
}

/**
 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
 *
 */
static void v9fs_destroy_inode_cache(void)
{
	kmem_cache_destroy(v9fs_inode_cache);
}

static int v9fs_cache_register(void)
{
	int ret;
	ret = v9fs_init_inode_cache();
	if (ret < 0)
		return ret;
#ifdef CONFIG_9P_FSCACHE
	return fscache_register_netfs(&v9fs_cache_netfs);
#else
	return ret;
#endif
}

static void v9fs_cache_unregister(void)
{
	v9fs_destroy_inode_cache();
#ifdef CONFIG_9P_FSCACHE
	fscache_unregister_netfs(&v9fs_cache_netfs);
#endif
}

/**
 * init_v9fs - Initialize module
 *
 */

static int __init init_v9fs(void)
{
	int err;
	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
	/* TODO: Setup list of registered trasnport modules */
	err = register_filesystem(&v9fs_fs_type);
	if (err < 0) {
		printk(KERN_ERR "Failed to register filesystem\n");
		return err;
	}

	err = v9fs_cache_register();
	if (err < 0) {
		printk(KERN_ERR "Failed to register v9fs for caching\n");
		goto out_fs_unreg;
	}

	err = v9fs_sysfs_init();
	if (err < 0) {
		printk(KERN_ERR "Failed to register with sysfs\n");
		goto out_sysfs_cleanup;
	}

	return 0;

out_sysfs_cleanup:
	v9fs_sysfs_cleanup();

out_fs_unreg:
	unregister_filesystem(&v9fs_fs_type);

	return err;
}

/**
 * exit_v9fs - shutdown module
 *
 */

static void __exit exit_v9fs(void)
{
	v9fs_sysfs_cleanup();
	v9fs_cache_unregister();
	unregister_filesystem(&v9fs_fs_type);
}

module_init(init_v9fs)
module_exit(exit_v9fs)

MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
MODULE_LICENSE("GPL");
Commit	Line	Data
9e82cf6a EVH	1	/*
	2	* linux/fs/9p/v9fs.c
	3	*
	4	* This file contains functions assisting in mapping VFS to 9P2000
	5	*
8a0dc95f	6	* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
9e82cf6a EVH	7	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
42e8c509 EVH	10	* it under the terms of the GNU General Public License version 2
42e8c509 EVH	11	* as published by the Free Software Foundation.
9e82cf6a EVH	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to:
	20	* Free Software Foundation
	21	* 51 Franklin Street, Fifth Floor
	22	* Boston, MA 02111-1301 USA
	23	*
	24	*/
	25
9e82cf6a EVH	26	#include <linux/module.h>
	27	#include <linux/errno.h>
	28	#include <linux/fs.h>
914e2637	29	#include <linux/sched.h>
9e82cf6a EVH	30	#include <linux/parser.h>
9e82cf6a EVH	31	#include <linux/idr.h>
5a0e3ad6	32	#include <linux/slab.h>
bd238fb4	33	#include <net/9p/9p.h>
bd238fb4	34	#include <net/9p/client.h>
8b81ef58	35	#include <net/9p/transport.h>
9e82cf6a	36	#include "v9fs.h"
9e82cf6a	37	#include "v9fs_vfs.h"
60e78d2c AK	38	#include "cache.h"
	39
	40	static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
	41	static LIST_HEAD(v9fs_sessionlist);
a78ce05d	42	struct kmem_cache *v9fs_inode_cache;
9e82cf6a EVH	43
9e82cf6a EVH	44	/*
60e78d2c AK	45	* Option Parsing (code inspired by NFS code)
	46	* NOTE: each transport will parse its own options
	47	*/
9e82cf6a EVH	48
	49	enum {
	50	/* Options that take integer arguments */
8a0dc95f	51	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
9e82cf6a	52	/* String options */
60e78d2c	53	Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
9e82cf6a	54	/* Options that take no arguments */
8a0dc95f	55	Opt_nodevmap,
e03abc0c	56	/* Cache options */
60e78d2c	57	Opt_cache_loose, Opt_fscache,
ba17674f	58	/* Access options */
e782ef71	59	Opt_access, Opt_posixacl,
9e82cf6a EVH	60	/* Error token */
	61	Opt_err
	62	};
	63
a447c093	64	static const match_table_t tokens = {
9e2f6688	65	{Opt_debug, "debug=%x"},
bd32b82d LI	66	{Opt_dfltuid, "dfltuid=%u"},
bd32b82d LI	67	{Opt_dfltgid, "dfltgid=%u"},
9e82cf6a	68	{Opt_afid, "afid=%u"},
67543e50	69	{Opt_uname, "uname=%s"},
9e82cf6a	70	{Opt_remotename, "aname=%s"},
9e82cf6a	71	{Opt_nodevmap, "nodevmap"},
60e78d2c	72	{Opt_cache, "cache=%s"},
e03abc0c	73	{Opt_cache_loose, "loose"},
60e78d2c AK	74	{Opt_fscache, "fscache"},
60e78d2c AK	75	{Opt_cachetag, "cachetag=%s"},
ba17674f	76	{Opt_access, "access=%s"},
e782ef71	77	{Opt_posixacl, "posixacl"},
9e82cf6a EVH	78	{Opt_err, NULL}
	79	};
	80
a2dd43bb PK	81	/* Interpret mount options for cache mode */
	82	static int get_cache_mode(char *s)
	83	{
	84	int version = -EINVAL;
	85
	86	if (!strcmp(s, "loose")) {
	87	version = CACHE_LOOSE;
	88	P9_DPRINTK(P9_DEBUG_9P, "Cache mode: loose\n");
	89	} else if (!strcmp(s, "fscache")) {
	90	version = CACHE_FSCACHE;
	91	P9_DPRINTK(P9_DEBUG_9P, "Cache mode: fscache\n");
	92	} else if (!strcmp(s, "none")) {
	93	version = CACHE_NONE;
	94	P9_DPRINTK(P9_DEBUG_9P, "Cache mode: none\n");
	95	} else
	96	printk(KERN_INFO "9p: Unknown Cache mode %s.\n", s);
	97	return version;
	98	}
	99
9e82cf6a EVH	100	/**
9e82cf6a EVH	101	* v9fs_parse_options - parse mount options into session structure
9e82cf6a EVH	102	* @v9ses: existing v9fs session information
9e82cf6a EVH	103	*
ab31267d	104	* Return 0 upon success, -ERRNO upon failure.
9e82cf6a EVH	105	*/
9e82cf6a EVH	106
4b53e4b5	107	static int v9fs_parse_options(struct v9fs_session_info v9ses, char opts)
9e82cf6a	108	{
d8c8a9e3	109	char options, tmp_options;
9e82cf6a	110	substring_t args[MAX_OPT_ARGS];
a80d923e	111	char *p;
8a0dc95f	112	int option = 0;
ba17674f	113	char s, e;
ab31267d	114	int ret = 0;
9e82cf6a EVH	115
9e82cf6a EVH	116	/* setup defaults */
9e82cf6a EVH	117	v9ses->afid = ~0;
9e82cf6a EVH	118	v9ses->debug = 0;
a2dd43bb	119	v9ses->cache = CACHE_NONE;
60e78d2c AK	120	#ifdef CONFIG_9P_FSCACHE
	121	v9ses->cachetag = NULL;
	122	#endif
9e82cf6a	123
4b53e4b5	124	if (!opts)
ab31267d	125	return 0;
9e82cf6a	126
d8c8a9e3	127	tmp_options = kstrdup(opts, GFP_KERNEL);
bf2d29c6 EVH	128	if (!tmp_options) {
bf2d29c6 EVH	129	ret = -ENOMEM;
60e78d2c	130	goto fail_option_alloc;
bf2d29c6	131	}
d8c8a9e3	132	options = tmp_options;
ab31267d	133
9e82cf6a EVH	134	while ((p = strsep(&options, ",")) != NULL) {
	135	int token;
	136	if (!*p)
	137	continue;
	138	token = match_token(p, tokens, args);
67543e50	139	if (token < Opt_uname) {
ab31267d JM	140	int r = match_int(&args[0], &option);
ab31267d JM	141	if (r < 0) {
bd238fb4	142	P9_DPRINTK(P9_DEBUG_ERROR,
9e82cf6a	143	"integer field, but no integer?\n");
ab31267d	144	ret = r;
9e82cf6a EVH	145	continue;
9e82cf6a EVH	146	}
9e82cf6a EVH	147	}
9e82cf6a EVH	148	switch (token) {
9e2f6688 EVH	149	case Opt_debug:
9e2f6688 EVH	150	v9ses->debug = option;
10fa16e7	151	#ifdef CONFIG_NET_9P_DEBUG
9e2f6688	152	p9_debug_level = option;
10fa16e7	153	#endif
9e2f6688	154	break;
8a0dc95f	155
bd32b82d LI	156	case Opt_dfltuid:
bd32b82d LI	157	v9ses->dfltuid = option;
9e82cf6a	158	break;
bd32b82d LI	159	case Opt_dfltgid:
bd32b82d LI	160	v9ses->dfltgid = option;
9e82cf6a EVH	161	break;
	162	case Opt_afid:
	163	v9ses->afid = option;
	164	break;
67543e50	165	case Opt_uname:
b32a09db	166	match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
9e82cf6a EVH	167	break;
9e82cf6a EVH	168	case Opt_remotename:
b32a09db	169	match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
9e82cf6a	170	break;
9e82cf6a EVH	171	case Opt_nodevmap:
	172	v9ses->nodev = 1;
	173	break;
e03abc0c EVH	174	case Opt_cache_loose:
	175	v9ses->cache = CACHE_LOOSE;
	176	break;
60e78d2c AK	177	case Opt_fscache:
	178	v9ses->cache = CACHE_FSCACHE;
	179	break;
	180	case Opt_cachetag:
	181	#ifdef CONFIG_9P_FSCACHE
	182	v9ses->cachetag = match_strdup(&args[0]);
	183	#endif
	184	break;
	185	case Opt_cache:
	186	s = match_strdup(&args[0]);
bf2d29c6 EVH	187	if (!s) {
	188	ret = -ENOMEM;
	189	P9_DPRINTK(P9_DEBUG_ERROR,
	190	"problem allocating copy of cache arg\n");
	191	goto free_and_return;
	192	}
a2dd43bb PK	193	ret = get_cache_mode(s);
	194	if (ret == -EINVAL) {
	195	kfree(s);
	196	goto free_and_return;
	197	}
60e78d2c	198
a2dd43bb	199	v9ses->cache = ret;
60e78d2c AK	200	kfree(s);
60e78d2c AK	201	break;
ba17674f LI	202
	203	case Opt_access:
	204	s = match_strdup(&args[0]);
bf2d29c6 EVH	205	if (!s) {
	206	ret = -ENOMEM;
	207	P9_DPRINTK(P9_DEBUG_ERROR,
	208	"problem allocating copy of access arg\n");
	209	goto free_and_return;
	210	}
60e78d2c	211
ba17674f LI	212	v9ses->flags &= ~V9FS_ACCESS_MASK;
	213	if (strcmp(s, "user") == 0)
	214	v9ses->flags \|= V9FS_ACCESS_USER;
	215	else if (strcmp(s, "any") == 0)
	216	v9ses->flags \|= V9FS_ACCESS_ANY;
76381a42	217	else if (strcmp(s, "client") == 0) {
76381a42	218	v9ses->flags \|= V9FS_ACCESS_CLIENT;
76381a42	219	} else {
ba17674f	220	v9ses->flags \|= V9FS_ACCESS_SINGLE;
f1d9e458	221	v9ses->uid = simple_strtoul(s, &e, 10);
a2dd43bb PK	222	if (*e != '\0') {
	223	ret = -EINVAL;
	224	printk(KERN_INFO "9p: Unknown access "
	225	"argument %s.\n", s);
	226	kfree(s);
	227	goto free_and_return;
	228	}
ba17674f	229	}
a2dd43bb	230
0a976297	231	kfree(s);
ba17674f LI	232	break;
ba17674f LI	233
e782ef71 VJJ	234	case Opt_posixacl:
	235	#ifdef CONFIG_9P_FS_POSIX_ACL
	236	v9ses->flags \|= V9FS_POSIX_ACL;
	237	#else
	238	P9_DPRINTK(P9_DEBUG_ERROR,
	239	"Not defined CONFIG_9P_FS_POSIX_ACL. "
	240	"Ignoring posixacl option\n");
	241	#endif
	242	break;
	243
9e82cf6a EVH	244	default:
	245	continue;
	246	}
	247	}
d8c8a9e3	248
bf2d29c6	249	free_and_return:
d8c8a9e3	250	kfree(tmp_options);
60e78d2c	251	fail_option_alloc:
bf2d29c6	252	return ret;
9e82cf6a EVH	253	}
9e82cf6a EVH	254
9e82cf6a EVH	255	/**
	256	* v9fs_session_init - initialize session
	257	* @v9ses: session information structure
	258	* @dev_name: device being mounted
	259	* @data: options
	260	*
	261	*/
	262
bd238fb4	263	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	264	const char dev_name, char data)
9e82cf6a EVH	265	{
9e82cf6a	266	int retval = -EINVAL;
bd238fb4	267	struct p9_fid *fid;
ab31267d	268	int rc;
9e82cf6a	269
ba17674f LI	270	v9ses->uname = __getname();
ba17674f LI	271	if (!v9ses->uname)
bd238fb4	272	return ERR_PTR(-ENOMEM);
9e82cf6a	273
ba17674f LI	274	v9ses->aname = __getname();
	275	if (!v9ses->aname) {
	276	__putname(v9ses->uname);
bd238fb4	277	return ERR_PTR(-ENOMEM);
9e82cf6a	278	}
a534c8d1	279	init_rwsem(&v9ses->rename_sem);
9e82cf6a	280
0ed07ddb JA	281	rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
	282	if (rc) {
	283	__putname(v9ses->aname);
	284	__putname(v9ses->uname);
	285	return ERR_PTR(rc);
	286	}
	287
60e78d2c AK	288	spin_lock(&v9fs_sessionlist_lock);
	289	list_add(&v9ses->slist, &v9fs_sessionlist);
	290	spin_unlock(&v9fs_sessionlist_lock);
	291
ba17674f LI	292	strcpy(v9ses->uname, V9FS_DEFUSER);
	293	strcpy(v9ses->aname, V9FS_DEFANAME);
	294	v9ses->uid = ~0;
bd32b82d LI	295	v9ses->dfltuid = V9FS_DEFUID;
bd32b82d LI	296	v9ses->dfltgid = V9FS_DEFGID;
ab31267d	297
4b53e4b5	298	v9ses->clnt = p9_client_create(dev_name, data);
bd238fb4 LI	299	if (IS_ERR(v9ses->clnt)) {
	300	retval = PTR_ERR(v9ses->clnt);
	301	v9ses->clnt = NULL;
	302	P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
	303	goto error;
9e82cf6a EVH	304	}
9e82cf6a EVH	305
6752a1eb VJJ	306	v9ses->flags = V9FS_ACCESS_USER;
	307
	308	if (p9_is_proto_dotl(v9ses->clnt)) {
	309	v9ses->flags = V9FS_ACCESS_CLIENT;
476ada04	310	v9ses->flags \|= V9FS_PROTO_2000L;
6752a1eb	311	} else if (p9_is_proto_dotu(v9ses->clnt)) {
476ada04	312	v9ses->flags \|= V9FS_PROTO_2000U;
6752a1eb VJJ	313	}
	314
	315	rc = v9fs_parse_options(v9ses, data);
	316	if (rc < 0) {
	317	retval = rc;
	318	goto error;
	319	}
ba17674f	320
fbedadc1	321	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
8a0dc95f	322
76381a42 AK	323	if (!v9fs_proto_dotl(v9ses) &&
	324	((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	325	/*
	326	* We support ACCESS_CLIENT only for dotl.
	327	* Fall back to ACCESS_USER
	328	*/
	329	v9ses->flags &= ~V9FS_ACCESS_MASK;
	330	v9ses->flags \|= V9FS_ACCESS_USER;
	331	}
	332	/FIXME !! /
ba17674f	333	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
9ffaf63e	334	if (!(v9fs_proto_dotu(v9ses) \|\| v9fs_proto_dotl(v9ses)) &&
ba17674f LI	335	((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
	336
	337	v9ses->flags &= ~V9FS_ACCESS_MASK;
	338	v9ses->flags \|= V9FS_ACCESS_ANY;
	339	v9ses->uid = ~0;
	340	}
e782ef71 VJJ	341	if (!v9fs_proto_dotl(v9ses) \|\|
	342	!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	343	/*
	344	* We support ACL checks on clinet only if the protocol is
	345	* 9P2000.L and access is V9FS_ACCESS_CLIENT.
	346	*/
	347	v9ses->flags &= ~V9FS_ACL_MASK;
	348	}
ba17674f LI	349
	350	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
	351	v9ses->aname);
bd238fb4 LI	352	if (IS_ERR(fid)) {
	353	retval = PTR_ERR(fid);
	354	fid = NULL;
	355	P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
	356	goto error;
9e82cf6a EVH	357	}
9e82cf6a EVH	358
ba17674f LI	359	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
	360	fid->uid = v9ses->uid;
	361	else
	362	fid->uid = ~0;
	363
60e78d2c AK	364	#ifdef CONFIG_9P_FSCACHE
	365	/* register the session for caching */
	366	v9fs_cache_session_get_cookie(v9ses);
	367	#endif
	368
bd238fb4	369	return fid;
9e82cf6a	370
bd238fb4	371	error:
0ed07ddb	372	bdi_destroy(&v9ses->bdi);
bd238fb4	373	return ERR_PTR(retval);
9e82cf6a EVH	374	}
	375
	376	/**
	377	* v9fs_session_close - shutdown a session
	378	* @v9ses: session information structure
	379	*
	380	*/
	381
	382	void v9fs_session_close(struct v9fs_session_info *v9ses)
	383	{
bd238fb4 LI	384	if (v9ses->clnt) {
	385	p9_client_destroy(v9ses->clnt);
	386	v9ses->clnt = NULL;
3cf6429a	387	}
9e82cf6a	388
60e78d2c AK	389	#ifdef CONFIG_9P_FSCACHE
	390	if (v9ses->fscache) {
	391	v9fs_cache_session_put_cookie(v9ses);
	392	kfree(v9ses->cachetag);
	393	}
	394	#endif
ba17674f LI	395	__putname(v9ses->uname);
ba17674f LI	396	__putname(v9ses->aname);
60e78d2c	397
0ed07ddb JA	398	bdi_destroy(&v9ses->bdi);
0ed07ddb JA	399
60e78d2c AK	400	spin_lock(&v9fs_sessionlist_lock);
	401	list_del(&v9ses->slist);
	402	spin_unlock(&v9fs_sessionlist_lock);
9e82cf6a EVH	403	}
9e82cf6a EVH	404
322b329a	405	/**
ee443996 EVH	406	* v9fs_session_cancel - terminate a session
	407	* @v9ses: session to terminate
	408	*
	409	* mark transport as disconnected and cancel all pending requests.
322b329a	410	*/
ee443996	411
322b329a	412	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
bd238fb4 LI	413	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4 LI	414	p9_client_disconnect(v9ses->clnt);
322b329a EVH	415	}
322b329a EVH	416
6d96d3ab AK	417	/**
	418	* v9fs_session_begin_cancel - Begin terminate of a session
	419	* @v9ses: session to terminate
	420	*
	421	* After this call we don't allow any request other than clunk.
	422	*/
	423
	424	void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
	425	{
	426	P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
	427	p9_client_begin_disconnect(v9ses->clnt);
	428	}
	429
9e82cf6a EVH	430	extern int v9fs_error_init(void);
9e82cf6a EVH	431
60e78d2c AK	432	static struct kobject *v9fs_kobj;
	433
	434	#ifdef CONFIG_9P_FSCACHE
9e82cf6a	435	/**
60e78d2c AK	436	* caches_show - list caches associated with a session
	437	*
	438	* Returns the size of buffer written.
	439	*/
	440
	441	static ssize_t caches_show(struct kobject *kobj,
	442	struct kobj_attribute *attr,
	443	char *buf)
	444	{
	445	ssize_t n = 0, count = 0, limit = PAGE_SIZE;
	446	struct v9fs_session_info *v9ses;
	447
	448	spin_lock(&v9fs_sessionlist_lock);
	449	list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
	450	if (v9ses->cachetag) {
	451	n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
	452	if (n < 0) {
	453	count = n;
	454	break;
	455	}
	456
	457	count += n;
	458	limit -= n;
	459	}
	460	}
	461
	462	spin_unlock(&v9fs_sessionlist_lock);
	463	return count;
	464	}
	465
	466	static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
	467	#endif /* CONFIG_9P_FSCACHE */
	468
	469	static struct attribute *v9fs_attrs[] = {
	470	#ifdef CONFIG_9P_FSCACHE
	471	&v9fs_attr_cache.attr,
	472	#endif
	473	NULL,
	474	};
	475
	476	static struct attribute_group v9fs_attr_group = {
	477	.attrs = v9fs_attrs,
	478	};
	479
	480	/**
	481	* v9fs_sysfs_init - Initialize the v9fs sysfs interface
	482	*
	483	*/
	484
	485	static int v9fs_sysfs_init(void)
	486	{
	487	v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
	488	if (!v9fs_kobj)
	489	return -ENOMEM;
	490
	491	if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
	492	kobject_put(v9fs_kobj);
	493	return -ENOMEM;
	494	}
	495
	496	return 0;
	497	}
	498
	499	/**
500	* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
501	*
502	*/
503
504	static void v9fs_sysfs_cleanup(void)
505	{
506	sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
507	kobject_put(v9fs_kobj);
508	}
509
a78ce05d AK	510	static void v9fs_inode_init_once(void *foo)
	511	{
	512	struct v9fs_inode v9inode = (struct v9fs_inode )foo;
	513	#ifdef CONFIG_9P_FSCACHE
	514	v9inode->fscache = NULL;
a78ce05d	515	#endif
fd2421f5	516	memset(&v9inode->qid, 0, sizeof(v9inode->qid));
a78ce05d AK	517	inode_init_once(&v9inode->vfs_inode);
	518	}
	519
	520	/**
	521	* v9fs_init_inode_cache - initialize a cache for 9P
	522	* Returns 0 on success.
	523	*/
	524	static int v9fs_init_inode_cache(void)
	525	{
	526	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
	527	sizeof(struct v9fs_inode),
	528	0, (SLAB_RECLAIM_ACCOUNT\|
	529	SLAB_MEM_SPREAD),
	530	v9fs_inode_init_once);
	531	if (!v9fs_inode_cache)
	532	return -ENOMEM;
	533
	534	return 0;
	535	}
	536
	537	/**
	538	* v9fs_destroy_inode_cache - destroy the cache of 9P inode
	539	*
	540	*/
	541	static void v9fs_destroy_inode_cache(void)
	542	{
	543	kmem_cache_destroy(v9fs_inode_cache);
	544	}
	545
	546	static int v9fs_cache_register(void)
	547	{
	548	int ret;
	549	ret = v9fs_init_inode_cache();
	550	if (ret < 0)
	551	return ret;
	552	#ifdef CONFIG_9P_FSCACHE
	553	return fscache_register_netfs(&v9fs_cache_netfs);
	554	#else
	555	return ret;
	556	#endif
	557	}
	558
	559	static void v9fs_cache_unregister(void)
	560	{
	561	v9fs_destroy_inode_cache();
	562	#ifdef CONFIG_9P_FSCACHE
	563	fscache_unregister_netfs(&v9fs_cache_netfs);
	564	#endif
	565	}
	566
60e78d2c AK	567	/**
60e78d2c AK	568	* init_v9fs - Initialize module
9e82cf6a EVH	569	*
	570	*/
	571
	572	static int __init init_v9fs(void)
	573	{
60e78d2c	574	int err;
f94b3470	575	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
a80d923e	576	/* TODO: Setup list of registered trasnport modules */
60e78d2c AK	577	err = register_filesystem(&v9fs_fs_type);
	578	if (err < 0) {
	579	printk(KERN_ERR "Failed to register filesystem\n");
	580	return err;
	581	}
	582
	583	err = v9fs_cache_register();
	584	if (err < 0) {
	585	printk(KERN_ERR "Failed to register v9fs for caching\n");
	586	goto out_fs_unreg;
	587	}
	588
	589	err = v9fs_sysfs_init();
	590	if (err < 0) {
	591	printk(KERN_ERR "Failed to register with sysfs\n");
	592	goto out_sysfs_cleanup;
	593	}
	594
	595	return 0;
	596
	597	out_sysfs_cleanup:
	598	v9fs_sysfs_cleanup();
	599
	600	out_fs_unreg:
	601	unregister_filesystem(&v9fs_fs_type);
	602
	603	return err;
9e82cf6a EVH	604	}
	605
	606	/**
60e78d2c	607	* exit_v9fs - shutdown module
9e82cf6a EVH	608	*
	609	*/
	610
	611	static void __exit exit_v9fs(void)
	612	{
60e78d2c AK	613	v9fs_sysfs_cleanup();
60e78d2c AK	614	v9fs_cache_unregister();
9e82cf6a EVH	615	unregister_filesystem(&v9fs_fs_type);
	616	}
	617
	618	module_init(init_v9fs)
	619	module_exit(exit_v9fs)
	620
bd238fb4	621	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	622	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	623	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	624	MODULE_LICENSE("GPL");