[linux.git] / fs / afs / super.c

/*
 * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
 *
 * This software may be freely redistributed under the terms of the
 * GNU General Public License.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Authors: David Howells <[email protected]>
 *          David Woodhouse <[email protected]>
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include "vnode.h"
#include "volume.h"
#include "cell.h"
#include "cmservice.h"
#include "fsclient.h"
#include "super.h"
#include "internal.h"

#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */

struct afs_mount_params {
	int			rwpath;
	struct afs_cell		*default_cell;
	struct afs_volume	*volume;
};

static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
			    unsigned long flags);

static int afs_get_sb(struct file_system_type *fs_type,
		      int flags, const char *dev_name,
		      void *data, struct vfsmount *mnt);

static struct inode *afs_alloc_inode(struct super_block *sb);

static void afs_put_super(struct super_block *sb);

static void afs_destroy_inode(struct inode *inode);

struct file_system_type afs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "afs",
	.get_sb		= afs_get_sb,
	.kill_sb	= kill_anon_super,
	.fs_flags	= FS_BINARY_MOUNTDATA,
};

static struct super_operations afs_super_ops = {
	.statfs		= simple_statfs,
	.alloc_inode	= afs_alloc_inode,
	.drop_inode	= generic_delete_inode,
	.destroy_inode	= afs_destroy_inode,
	.clear_inode	= afs_clear_inode,
	.put_super	= afs_put_super,
};

static struct kmem_cache *afs_inode_cachep;
static atomic_t afs_count_active_inodes;

/*****************************************************************************/
/*
 * initialise the filesystem
 */
int __init afs_fs_init(void)
{
	int ret;

	_enter("");

	afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);

	/* create ourselves an inode cache */
	atomic_set(&afs_count_active_inodes, 0);

	ret = -ENOMEM;
	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
					     sizeof(struct afs_vnode),
					     0,
					     SLAB_HWCACHE_ALIGN,
					     afs_i_init_once,
					     NULL);
	if (!afs_inode_cachep) {
		printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
		return ret;
	}

	/* now export our filesystem to lesser mortals */
	ret = register_filesystem(&afs_fs_type);
	if (ret < 0) {
		kmem_cache_destroy(afs_inode_cachep);
		kleave(" = %d", ret);
		return ret;
	}

	kleave(" = 0");
	return 0;
} /* end afs_fs_init() */

/*****************************************************************************/
/*
 * clean up the filesystem
 */
void __exit afs_fs_exit(void)
{
	unregister_filesystem(&afs_fs_type);

	if (atomic_read(&afs_count_active_inodes) != 0) {
		printk("kAFS: %d active inode objects still present\n",
		       atomic_read(&afs_count_active_inodes));
		BUG();
	}

	kmem_cache_destroy(afs_inode_cachep);

} /* end afs_fs_exit() */

/*****************************************************************************/
/*
 * check that an argument has a value
 */
static int want_arg(char **_value, const char *option)
{
	if (!_value || !*_value || !**_value) {
		printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
		return 0;
	}
	return 1;
} /* end want_arg() */

/*****************************************************************************/
/*
 * check that there's no subsequent value
 */
static int want_no_value(char *const *_value, const char *option)
{
	if (*_value && **_value) {
		printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
		       option, *_value);
		return 0;
	}
	return 1;
} /* end want_no_value() */

/*****************************************************************************/
/*
 * parse the mount options
 * - this function has been shamelessly adapted from the ext3 fs which
 *   shamelessly adapted it from the msdos fs
 */
static int afs_super_parse_options(struct afs_mount_params *params,
				   char *options,
				   const char **devname)
{
	char *key, *value;
	int ret;

	_enter("%s", options);

	options[PAGE_SIZE - 1] = 0;

	ret = 0;
	while ((key = strsep(&options, ",")) != 0)
	{
		value = strchr(key, '=');
		if (value)
			*value++ = 0;

		printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");

		if (strcmp(key, "rwpath") == 0) {
			if (!want_no_value(&value, "rwpath"))
				return -EINVAL;
			params->rwpath = 1;
			continue;
		}
		else if (strcmp(key, "vol") == 0) {
			if (!want_arg(&value, "vol"))
				return -EINVAL;
			*devname = value;
			continue;
		}
		else if (strcmp(key, "cell") == 0) {
			if (!want_arg(&value, "cell"))
				return -EINVAL;
			afs_put_cell(params->default_cell);
			ret = afs_cell_lookup(value,
					      strlen(value),
					      &params->default_cell);
			if (ret < 0)
				return -EINVAL;
			continue;
		}

		printk("kAFS: Unknown mount option: '%s'\n",  key);
		ret = -EINVAL;
		goto error;
	}

	ret = 0;

 error:
	_leave(" = %d", ret);
	return ret;
} /* end afs_super_parse_options() */

/*****************************************************************************/
/*
 * check a superblock to see if it's the one we're looking for
 */
static int afs_test_super(struct super_block *sb, void *data)
{
	struct afs_mount_params *params = data;
	struct afs_super_info *as = sb->s_fs_info;

	return as->volume == params->volume;
} /* end afs_test_super() */

/*****************************************************************************/
/*
 * fill in the superblock
 */
static int afs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct afs_mount_params *params = data;
	struct afs_super_info *as = NULL;
	struct afs_fid fid;
	struct dentry *root = NULL;
	struct inode *inode = NULL;
	int ret;

	kenter("");

	/* allocate a superblock info record */
	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
	if (!as) {
		_leave(" = -ENOMEM");
		return -ENOMEM;
	}

	afs_get_volume(params->volume);
	as->volume = params->volume;

	/* fill in the superblock */
	sb->s_blocksize		= PAGE_CACHE_SIZE;
	sb->s_blocksize_bits	= PAGE_CACHE_SHIFT;
	sb->s_magic		= AFS_FS_MAGIC;
	sb->s_op		= &afs_super_ops;
	sb->s_fs_info		= as;

	/* allocate the root inode and dentry */
	fid.vid		= as->volume->vid;
	fid.vnode	= 1;
	fid.unique	= 1;
	ret = afs_iget(sb, &fid, &inode);
	if (ret < 0)
		goto error;

	ret = -ENOMEM;
	root = d_alloc_root(inode);
	if (!root)
		goto error;

	sb->s_root = root;

	kleave(" = 0");
	return 0;

 error:
	iput(inode);
	afs_put_volume(as->volume);
	kfree(as);

	sb->s_fs_info = NULL;

	kleave(" = %d", ret);
	return ret;
} /* end afs_fill_super() */

/*****************************************************************************/
/*
 * get an AFS superblock
 * - TODO: don't use get_sb_nodev(), but rather call sget() directly
 */
static int afs_get_sb(struct file_system_type *fs_type,
		      int flags,
		      const char *dev_name,
		      void *options,
		      struct vfsmount *mnt)
{
	struct afs_mount_params params;
	struct super_block *sb;
	int ret;

	_enter(",,%s,%p", dev_name, options);

	memset(&params, 0, sizeof(params));

	/* start the cache manager */
	ret = afscm_start();
	if (ret < 0) {
		_leave(" = %d", ret);
		return ret;
	}

	/* parse the options */
	if (options) {
		ret = afs_super_parse_options(&params, options, &dev_name);
		if (ret < 0)
			goto error;
		if (!dev_name) {
			printk("kAFS: no volume name specified\n");
			ret = -EINVAL;
			goto error;
		}
	}

	/* parse the device name */
	ret = afs_volume_lookup(dev_name,
				params.default_cell,
				params.rwpath,
				&params.volume);
	if (ret < 0)
		goto error;

	/* allocate a deviceless superblock */
	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
	if (IS_ERR(sb))
		goto error;

	sb->s_flags = flags;

	ret = afs_fill_super(sb, &params, flags & MS_SILENT ? 1 : 0);
	if (ret < 0) {
		up_write(&sb->s_umount);
		deactivate_super(sb);
		goto error;
	}
	sb->s_flags |= MS_ACTIVE;
	simple_set_mnt(mnt, sb);

	afs_put_volume(params.volume);
	afs_put_cell(params.default_cell);
	_leave(" = 0 [%p]", 0, sb);
	return 0;

 error:
	afs_put_volume(params.volume);
	afs_put_cell(params.default_cell);
	afscm_stop();
	_leave(" = %d", ret);
	return ret;
} /* end afs_get_sb() */

/*****************************************************************************/
/*
 * finish the unmounting process on the superblock
 */
static void afs_put_super(struct super_block *sb)
{
	struct afs_super_info *as = sb->s_fs_info;

	_enter("");

	afs_put_volume(as->volume);
	afscm_stop();

	_leave("");
} /* end afs_put_super() */

/*****************************************************************************/
/*
 * initialise an inode cache slab element prior to any use
 */
static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
			    unsigned long flags)
{
	struct afs_vnode *vnode = (struct afs_vnode *) _vnode;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		memset(vnode, 0, sizeof(*vnode));
		inode_init_once(&vnode->vfs_inode);
		init_waitqueue_head(&vnode->update_waitq);
		spin_lock_init(&vnode->lock);
		INIT_LIST_HEAD(&vnode->cb_link);
		INIT_LIST_HEAD(&vnode->cb_hash_link);
		afs_timer_init(&vnode->cb_timeout,
			       &afs_vnode_cb_timed_out_ops);
	}

} /* end afs_i_init_once() */

/*****************************************************************************/
/*
 * allocate an AFS inode struct from our slab cache
 */
static struct inode *afs_alloc_inode(struct super_block *sb)
{
	struct afs_vnode *vnode;

	vnode = (struct afs_vnode *)
		kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
	if (!vnode)
		return NULL;

	atomic_inc(&afs_count_active_inodes);

	memset(&vnode->fid, 0, sizeof(vnode->fid));
	memset(&vnode->status, 0, sizeof(vnode->status));

	vnode->volume		= NULL;
	vnode->update_cnt	= 0;
	vnode->flags		= 0;

	return &vnode->vfs_inode;
} /* end afs_alloc_inode() */

/*****************************************************************************/
/*
 * destroy an AFS inode struct
 */
static void afs_destroy_inode(struct inode *inode)
{
	_enter("{%lu}", inode->i_ino);

	kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));

	atomic_dec(&afs_count_active_inodes);

} /* end afs_destroy_inode() */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2002 Red Hat, Inc. All rights reserved.
	3	*
	4	* This software may be freely redistributed under the terms of the
	5	* GNU General Public License.
	6	*
	7	* You should have received a copy of the GNU General Public License
	8	* along with this program; if not, write to the Free Software
	9	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	10	*
	11	* Authors: David Howells <[email protected]>
	12	* David Woodhouse <[email protected]>
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/slab.h>
	20	#include <linux/fs.h>
	21	#include <linux/pagemap.h>
	22	#include "vnode.h"
	23	#include "volume.h"
	24	#include "cell.h"
	25	#include "cmservice.h"
	26	#include "fsclient.h"
	27	#include "super.h"
	28	#include "internal.h"
	29
	30	#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
	31
	32	struct afs_mount_params {
	33	int rwpath;
	34	struct afs_cell *default_cell;
	35	struct afs_volume *volume;
	36	};
	37
e18b890b	38	static void afs_i_init_once(void foo, struct kmem_cache cachep,
1da177e4 LT	39	unsigned long flags);
1da177e4 LT	40
454e2398 DH	41	static int afs_get_sb(struct file_system_type *fs_type,
	42	int flags, const char *dev_name,
	43	void data, struct vfsmount mnt);
1da177e4 LT	44
	45	static struct inode afs_alloc_inode(struct super_block sb);
	46
	47	static void afs_put_super(struct super_block *sb);
	48
	49	static void afs_destroy_inode(struct inode *inode);
	50
1f5ce9e9	51	struct file_system_type afs_fs_type = {
1da177e4 LT	52	.owner = THIS_MODULE,
	53	.name = "afs",
	54	.get_sb = afs_get_sb,
	55	.kill_sb = kill_anon_super,
	56	.fs_flags = FS_BINARY_MOUNTDATA,
	57	};
	58
	59	static struct super_operations afs_super_ops = {
	60	.statfs = simple_statfs,
	61	.alloc_inode = afs_alloc_inode,
	62	.drop_inode = generic_delete_inode,
	63	.destroy_inode = afs_destroy_inode,
	64	.clear_inode = afs_clear_inode,
	65	.put_super = afs_put_super,
	66	};
	67
e18b890b	68	static struct kmem_cache *afs_inode_cachep;
1da177e4 LT	69	static atomic_t afs_count_active_inodes;
	70
	71	/*****************************************************************************/
	72	/*
	73	* initialise the filesystem
	74	*/
	75	int __init afs_fs_init(void)
	76	{
	77	int ret;
	78
	79	_enter("");
	80
	81	afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);
	82
	83	/* create ourselves an inode cache */
	84	atomic_set(&afs_count_active_inodes, 0);
	85
	86	ret = -ENOMEM;
	87	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
	88	sizeof(struct afs_vnode),
	89	0,
	90	SLAB_HWCACHE_ALIGN,
	91	afs_i_init_once,
	92	NULL);
	93	if (!afs_inode_cachep) {
	94	printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
	95	return ret;
	96	}
	97
	98	/* now export our filesystem to lesser mortals */
	99	ret = register_filesystem(&afs_fs_type);
	100	if (ret < 0) {
	101	kmem_cache_destroy(afs_inode_cachep);
	102	kleave(" = %d", ret);
	103	return ret;
	104	}
	105
	106	kleave(" = 0");
	107	return 0;
	108	} /* end afs_fs_init() */
	109
	110	/*****************************************************************************/
	111	/*
	112	* clean up the filesystem
	113	*/
	114	void __exit afs_fs_exit(void)
	115	{
	116	unregister_filesystem(&afs_fs_type);
	117
	118	if (atomic_read(&afs_count_active_inodes) != 0) {
	119	printk("kAFS: %d active inode objects still present\n",
	120	atomic_read(&afs_count_active_inodes));
	121	BUG();
	122	}
	123
	124	kmem_cache_destroy(afs_inode_cachep);
	125
	126	} /* end afs_fs_exit() */
	127
	128	/*****************************************************************************/
	129	/*
	130	* check that an argument has a value
	131	*/
	132	static int want_arg(char *_value, const char option)
133	{
134	if (!_value \|\| !_value \|\| !*_value) {
135	printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
136	return 0;
137	}
138	return 1;
139	} /* end want_arg() */
140
141	/*****************************************************************************/
142	/*
143	* check that there's no subsequent value
144	*/
145	static int want_no_value(char const _value, const char *option)
146	{
147	if (_value && *_value) {
148	printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
149	option, *_value);
150	return 0;
151	}
152	return 1;
153	} /* end want_no_value() */
154
155	/*****************************************************************************/
156	/*
157	* parse the mount options
158	* - this function has been shamelessly adapted from the ext3 fs which
159	* shamelessly adapted it from the msdos fs
160	*/
161	static int afs_super_parse_options(struct afs_mount_params *params,
162	char *options,
163	const char **devname)
164	{
165	char key, value;
166	int ret;
167
168	_enter("%s", options);
169
170	options[PAGE_SIZE - 1] = 0;
171
172	ret = 0;
173	while ((key = strsep(&options, ",")) != 0)
174	{
175	value = strchr(key, '=');
176	if (value)
177	*value++ = 0;
178
179	printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");
180
181	if (strcmp(key, "rwpath") == 0) {
182	if (!want_no_value(&value, "rwpath"))
183	return -EINVAL;
184	params->rwpath = 1;
185	continue;
186	}
187	else if (strcmp(key, "vol") == 0) {
188	if (!want_arg(&value, "vol"))
189	return -EINVAL;
190	*devname = value;
191	continue;
192	}
193	else if (strcmp(key, "cell") == 0) {
194	if (!want_arg(&value, "cell"))
195	return -EINVAL;
196	afs_put_cell(params->default_cell);
197	ret = afs_cell_lookup(value,
198	strlen(value),
199	&params->default_cell);
200	if (ret < 0)
201	return -EINVAL;
202	continue;
203	}
204
205	printk("kAFS: Unknown mount option: '%s'\n", key);
206	ret = -EINVAL;
207	goto error;
208	}
209
210	ret = 0;
211
212	error:
213	_leave(" = %d", ret);
214	return ret;
215	} /* end afs_super_parse_options() */
216
217	/*****************************************************************************/
218	/*
219	* check a superblock to see if it's the one we're looking for
220	*/
221	static int afs_test_super(struct super_block sb, void data)
222	{
223	struct afs_mount_params *params = data;
224	struct afs_super_info *as = sb->s_fs_info;
225
226	return as->volume == params->volume;
227	} /* end afs_test_super() */
228
229	/*****************************************************************************/
230	/*
231	* fill in the superblock
232	*/
233	static int afs_fill_super(struct super_block sb, void data, int silent)
234	{
235	struct afs_mount_params *params = data;
236	struct afs_super_info *as = NULL;
237	struct afs_fid fid;
238	struct dentry *root = NULL;
239	struct inode *inode = NULL;
240	int ret;
241
242	kenter("");
243
244	/* allocate a superblock info record */
b593e48d	245	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
1da177e4 LT	246	if (!as) {
	247	_leave(" = -ENOMEM");
	248	return -ENOMEM;
	249	}
	250
1da177e4 LT	251	afs_get_volume(params->volume);
	252	as->volume = params->volume;
	253
	254	/* fill in the superblock */
	255	sb->s_blocksize = PAGE_CACHE_SIZE;
	256	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	257	sb->s_magic = AFS_FS_MAGIC;
	258	sb->s_op = &afs_super_ops;
	259	sb->s_fs_info = as;
	260
	261	/* allocate the root inode and dentry */
	262	fid.vid = as->volume->vid;
	263	fid.vnode = 1;
	264	fid.unique = 1;
	265	ret = afs_iget(sb, &fid, &inode);
	266	if (ret < 0)
	267	goto error;
	268
	269	ret = -ENOMEM;
	270	root = d_alloc_root(inode);
	271	if (!root)
	272	goto error;
	273
	274	sb->s_root = root;
	275
	276	kleave(" = 0");
	277	return 0;
	278
	279	error:
	280	iput(inode);
	281	afs_put_volume(as->volume);
	282	kfree(as);
	283
	284	sb->s_fs_info = NULL;
	285
	286	kleave(" = %d", ret);
	287	return ret;
	288	} /* end afs_fill_super() */
	289
	290	/*****************************************************************************/
	291	/*
	292	* get an AFS superblock
	293	* - TODO: don't use get_sb_nodev(), but rather call sget() directly
	294	*/
454e2398 DH	295	static int afs_get_sb(struct file_system_type *fs_type,
	296	int flags,
	297	const char *dev_name,
	298	void *options,
	299	struct vfsmount *mnt)
1da177e4 LT	300	{
	301	struct afs_mount_params params;
	302	struct super_block *sb;
	303	int ret;
	304
	305	_enter(",,%s,%p", dev_name, options);
	306
	307	memset(&params, 0, sizeof(params));
	308
	309	/* start the cache manager */
	310	ret = afscm_start();
	311	if (ret < 0) {
	312	_leave(" = %d", ret);
454e2398	313	return ret;
1da177e4 LT	314	}
	315
	316	/* parse the options */
	317	if (options) {
	318	ret = afs_super_parse_options(&params, options, &dev_name);
	319	if (ret < 0)
	320	goto error;
	321	if (!dev_name) {
	322	printk("kAFS: no volume name specified\n");
	323	ret = -EINVAL;
	324	goto error;
	325	}
	326	}
	327
	328	/* parse the device name */
	329	ret = afs_volume_lookup(dev_name,
	330	params.default_cell,
	331	params.rwpath,
	332	&params.volume);
	333	if (ret < 0)
	334	goto error;
	335
	336	/* allocate a deviceless superblock */
	337	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
	338	if (IS_ERR(sb))
	339	goto error;
	340
	341	sb->s_flags = flags;
	342
9b04c997	343	ret = afs_fill_super(sb, &params, flags & MS_SILENT ? 1 : 0);
1da177e4 LT	344	if (ret < 0) {
	345	up_write(&sb->s_umount);
	346	deactivate_super(sb);
	347	goto error;
	348	}
	349	sb->s_flags \|= MS_ACTIVE;
454e2398	350	simple_set_mnt(mnt, sb);
1da177e4 LT	351
	352	afs_put_volume(params.volume);
	353	afs_put_cell(params.default_cell);
454e2398 DH	354	_leave(" = 0 [%p]", 0, sb);
454e2398 DH	355	return 0;
1da177e4 LT	356
	357	error:
	358	afs_put_volume(params.volume);
	359	afs_put_cell(params.default_cell);
	360	afscm_stop();
	361	_leave(" = %d", ret);
454e2398	362	return ret;
1da177e4 LT	363	} /* end afs_get_sb() */
	364
	365	/*****************************************************************************/
	366	/*
	367	* finish the unmounting process on the superblock
	368	*/
	369	static void afs_put_super(struct super_block *sb)
	370	{
	371	struct afs_super_info *as = sb->s_fs_info;
	372
	373	_enter("");
	374
	375	afs_put_volume(as->volume);
	376	afscm_stop();
	377
	378	_leave("");
	379	} /* end afs_put_super() */
	380
	381	/*****************************************************************************/
	382	/*
	383	* initialise an inode cache slab element prior to any use
	384	*/
e18b890b	385	static void afs_i_init_once(void _vnode, struct kmem_cache cachep,
1da177e4 LT	386	unsigned long flags)
	387	{
	388	struct afs_vnode vnode = (struct afs_vnode ) _vnode;
	389
	390	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	391	SLAB_CTOR_CONSTRUCTOR) {
	392	memset(vnode, 0, sizeof(*vnode));
	393	inode_init_once(&vnode->vfs_inode);
	394	init_waitqueue_head(&vnode->update_waitq);
	395	spin_lock_init(&vnode->lock);
	396	INIT_LIST_HEAD(&vnode->cb_link);
	397	INIT_LIST_HEAD(&vnode->cb_hash_link);
	398	afs_timer_init(&vnode->cb_timeout,
	399	&afs_vnode_cb_timed_out_ops);
	400	}
	401
	402	} /* end afs_i_init_once() */
	403
	404	/*****************************************************************************/
	405	/*
	406	* allocate an AFS inode struct from our slab cache
	407	*/
	408	static struct inode afs_alloc_inode(struct super_block sb)
	409	{
	410	struct afs_vnode *vnode;
	411
	412	vnode = (struct afs_vnode *)
e94b1766	413	kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
1da177e4 LT	414	if (!vnode)
	415	return NULL;
	416
	417	atomic_inc(&afs_count_active_inodes);
	418
	419	memset(&vnode->fid, 0, sizeof(vnode->fid));
	420	memset(&vnode->status, 0, sizeof(vnode->status));
	421
	422	vnode->volume = NULL;
	423	vnode->update_cnt = 0;
	424	vnode->flags = 0;
	425
	426	return &vnode->vfs_inode;
	427	} /* end afs_alloc_inode() */
	428
	429	/*****************************************************************************/
	430	/*
	431	* destroy an AFS inode struct
	432	*/
	433	static void afs_destroy_inode(struct inode *inode)
	434	{
	435	_enter("{%lu}", inode->i_ino);
	436
	437	kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
	438
	439	atomic_dec(&afs_count_active_inodes);
	440
	441	} /* end afs_destroy_inode() */