[mirror_ubuntu-bionic-kernel.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}
};

/**
 * 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 = 0;
#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;
			}

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