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

/* AFS superblock handling
 *
 * Copyright (c) 2002, 2007 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 "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 const 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,
	.umount_begin	= afs_umount_begin,
	.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("");

	/* 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);
		_leave(" = %d", ret);
		return ret;
	}

	_leave(" = 0");
	return 0;
}

/*
 * clean up the filesystem
 */
void __exit afs_fs_exit(void)
{
	_enter("");

	afs_mntpt_kill_timer();
	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);
	_leave("");
}

/*
 * 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;
}

/*
 * 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;
}

/*
 * 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)
{
	struct afs_cell *cell;
	char *key, *value;
	int ret;

	_enter("%s", options);

	options[PAGE_SIZE - 1] = 0;

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

		_debug("kAFS: KEY: %s, VAL:%s", key, value ?: "-");

		if (strcmp(key, "rwpath") == 0) {
			if (!want_no_value(&value, "rwpath"))
				return -EINVAL;
			params->rwpath = 1;
		} else if (strcmp(key, "vol") == 0) {
			if (!want_arg(&value, "vol"))
				return -EINVAL;
			*devname = value;
		} else if (strcmp(key, "cell") == 0) {
			if (!want_arg(&value, "cell"))
				return -EINVAL;
			cell = afs_cell_lookup(value, strlen(value));
			if (IS_ERR(cell))
				return PTR_ERR(cell);
			afs_put_cell(params->default_cell);
			params->default_cell = cell;
		} else {
			printk("kAFS: Unknown mount option: '%s'\n",  key);
			ret = -EINVAL;
			goto error;
		}
	}

	ret = 0;
error:
	_leave(" = %d", ret);
	return ret;
}

/*
 * 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;
}

/*
 * 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;

	_enter("");

	/* 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;
	inode = afs_iget(sb, &fid);
	if (IS_ERR(inode))
		goto error_inode;

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

	sb->s_root = root;

	_leave(" = 0");
	return 0;

error_inode:
	ret = PTR_ERR(inode);
	inode = NULL;
error:
	iput(inode);
	afs_put_volume(as->volume);
	kfree(as);

	sb->s_fs_info = NULL;

	_leave(" = %d", ret);
	return ret;
}

/*
 * 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;
	struct afs_volume *vol;
	int ret;

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

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

	/* 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 */
	vol = afs_volume_lookup(dev_name, params.default_cell, params.rwpath);
	if (IS_ERR(vol)) {
		ret = PTR_ERR(vol);
		goto error;
	}

	params.volume = vol;

	/* allocate a deviceless superblock */
	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
	if (IS_ERR(sb)) {
		ret = PTR_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]", sb);
	return 0;

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

/*
 * 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);

	_leave("");
}

/*
 * 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 = _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_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
		mutex_init(&vnode->cb_broken_lock);
	}
}

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

	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;
	vnode->cb_promised	= false;

	return &vnode->vfs_inode;
}

/*
 * destroy an AFS inode struct
 */
static void afs_destroy_inode(struct inode *inode)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);

	_enter("{%lu}", inode->i_ino);

	_debug("DESTROY INODE %p", inode);

	ASSERTCMP(vnode->server, ==, NULL);

	kmem_cache_free(afs_inode_cachep, vnode);
	atomic_dec(&afs_count_active_inodes);
}
Commit	Line	Data
ec26815a DH	1	/* AFS superblock handling
ec26815a DH	2	*
08e0e7c8	3	* Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
1da177e4 LT	4	*
	5	* This software may be freely redistributed under the terms of the
	6	* GNU General Public License.
	7	*
	8	* You should have received a copy of the GNU General Public License
	9	* along with this program; if not, write to the Free Software
	10	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	11	*
	12	* Authors: David Howells <[email protected]>
ec26815a	13	* David Woodhouse <[email protected]>
1da177e4 LT	14	*
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/slab.h>
	21	#include <linux/fs.h>
	22	#include <linux/pagemap.h>
1da177e4 LT	23	#include "internal.h"
	24
	25	#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
	26
	27	struct afs_mount_params {
	28	int rwpath;
	29	struct afs_cell *default_cell;
	30	struct afs_volume *volume;
	31	};
	32
e18b890b	33	static void afs_i_init_once(void foo, struct kmem_cache cachep,
1da177e4 LT	34	unsigned long flags);
1da177e4 LT	35
454e2398 DH	36	static int afs_get_sb(struct file_system_type *fs_type,
	37	int flags, const char *dev_name,
	38	void data, struct vfsmount mnt);
1da177e4 LT	39
	40	static struct inode afs_alloc_inode(struct super_block sb);
	41
	42	static void afs_put_super(struct super_block *sb);
	43
	44	static void afs_destroy_inode(struct inode *inode);
	45
1f5ce9e9	46	struct file_system_type afs_fs_type = {
1da177e4 LT	47	.owner = THIS_MODULE,
	48	.name = "afs",
	49	.get_sb = afs_get_sb,
	50	.kill_sb = kill_anon_super,
	51	.fs_flags = FS_BINARY_MOUNTDATA,
	52	};
	53
ee9b6d61	54	static const struct super_operations afs_super_ops = {
1da177e4 LT	55	.statfs = simple_statfs,
	56	.alloc_inode = afs_alloc_inode,
	57	.drop_inode = generic_delete_inode,
	58	.destroy_inode = afs_destroy_inode,
	59	.clear_inode = afs_clear_inode,
08e0e7c8	60	.umount_begin = afs_umount_begin,
1da177e4 LT	61	.put_super = afs_put_super,
	62	};
	63
e18b890b	64	static struct kmem_cache *afs_inode_cachep;
1da177e4 LT	65	static atomic_t afs_count_active_inodes;
1da177e4 LT	66
1da177e4 LT	67	/*
	68	* initialise the filesystem
	69	*/
	70	int __init afs_fs_init(void)
	71	{
	72	int ret;
	73
	74	_enter("");
	75
1da177e4 LT	76	/* create ourselves an inode cache */
	77	atomic_set(&afs_count_active_inodes, 0);
	78
	79	ret = -ENOMEM;
	80	afs_inode_cachep = kmem_cache_create("afs_inode_cache",
	81	sizeof(struct afs_vnode),
	82	0,
	83	SLAB_HWCACHE_ALIGN,
	84	afs_i_init_once,
	85	NULL);
	86	if (!afs_inode_cachep) {
	87	printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
	88	return ret;
	89	}
	90
	91	/* now export our filesystem to lesser mortals */
	92	ret = register_filesystem(&afs_fs_type);
	93	if (ret < 0) {
	94	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	95	_leave(" = %d", ret);
1da177e4 LT	96	return ret;
	97	}
	98
08e0e7c8	99	_leave(" = 0");
1da177e4	100	return 0;
ec26815a	101	}
1da177e4	102
1da177e4 LT	103	/*
	104	* clean up the filesystem
	105	*/
	106	void __exit afs_fs_exit(void)
	107	{
08e0e7c8 DH	108	_enter("");
	109
	110	afs_mntpt_kill_timer();
1da177e4 LT	111	unregister_filesystem(&afs_fs_type);
	112
	113	if (atomic_read(&afs_count_active_inodes) != 0) {
	114	printk("kAFS: %d active inode objects still present\n",
	115	atomic_read(&afs_count_active_inodes));
	116	BUG();
	117	}
	118
	119	kmem_cache_destroy(afs_inode_cachep);
08e0e7c8	120	_leave("");
ec26815a	121	}
1da177e4	122
1da177e4 LT	123	/*
	124	* check that an argument has a value
	125	*/
	126	static int want_arg(char *_value, const char option)
	127	{
	128	if (!_value \|\| !_value \|\| !*_value) {
	129	printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
	130	return 0;
	131	}
	132	return 1;
ec26815a	133	}
1da177e4	134
1da177e4 LT	135	/*
	136	* check that there's no subsequent value
	137	*/
	138	static int want_no_value(char const _value, const char *option)
	139	{
	140	if (_value && *_value) {
	141	printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
	142	option, *_value);
	143	return 0;
	144	}
	145	return 1;
ec26815a	146	}
1da177e4	147
1da177e4 LT	148	/*
	149	* parse the mount options
	150	* - this function has been shamelessly adapted from the ext3 fs which
	151	* shamelessly adapted it from the msdos fs
	152	*/
	153	static int afs_super_parse_options(struct afs_mount_params *params,
08e0e7c8	154	char options, const char *devname)
1da177e4	155	{
08e0e7c8	156	struct afs_cell *cell;
1da177e4 LT	157	char key, value;
	158	int ret;
	159
	160	_enter("%s", options);
	161
	162	options[PAGE_SIZE - 1] = 0;
	163
	164	ret = 0;
08e0e7c8	165	while ((key = strsep(&options, ","))) {
1da177e4 LT	166	value = strchr(key, '=');
	167	if (value)
	168	*value++ = 0;
	169
08e0e7c8	170	_debug("kAFS: KEY: %s, VAL:%s", key, value ?: "-");
1da177e4 LT	171
	172	if (strcmp(key, "rwpath") == 0) {
	173	if (!want_no_value(&value, "rwpath"))
	174	return -EINVAL;
	175	params->rwpath = 1;
ec26815a	176	} else if (strcmp(key, "vol") == 0) {
1da177e4 LT	177	if (!want_arg(&value, "vol"))
	178	return -EINVAL;
	179	*devname = value;
ec26815a	180	} else if (strcmp(key, "cell") == 0) {
1da177e4 LT	181	if (!want_arg(&value, "cell"))
1da177e4 LT	182	return -EINVAL;
08e0e7c8 DH	183	cell = afs_cell_lookup(value, strlen(value));
	184	if (IS_ERR(cell))
	185	return PTR_ERR(cell);
1da177e4	186	afs_put_cell(params->default_cell);
08e0e7c8 DH	187	params->default_cell = cell;
	188	} else {
	189	printk("kAFS: Unknown mount option: '%s'\n", key);
	190	ret = -EINVAL;
	191	goto error;
1da177e4	192	}
1da177e4 LT	193	}
	194
	195	ret = 0;
ec26815a	196	error:
1da177e4 LT	197	_leave(" = %d", ret);
1da177e4 LT	198	return ret;
ec26815a	199	}
1da177e4	200
1da177e4 LT	201	/*
	202	* check a superblock to see if it's the one we're looking for
	203	*/
	204	static int afs_test_super(struct super_block sb, void data)
	205	{
	206	struct afs_mount_params *params = data;
	207	struct afs_super_info *as = sb->s_fs_info;
	208
	209	return as->volume == params->volume;
ec26815a	210	}
1da177e4	211
1da177e4 LT	212	/*
	213	* fill in the superblock
	214	*/
	215	static int afs_fill_super(struct super_block sb, void data, int silent)
	216	{
	217	struct afs_mount_params *params = data;
	218	struct afs_super_info *as = NULL;
	219	struct afs_fid fid;
	220	struct dentry *root = NULL;
	221	struct inode *inode = NULL;
	222	int ret;
	223
08e0e7c8	224	_enter("");
1da177e4 LT	225
1da177e4 LT	226	/* allocate a superblock info record */
b593e48d	227	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
1da177e4 LT	228	if (!as) {
	229	_leave(" = -ENOMEM");
	230	return -ENOMEM;
	231	}
	232
1da177e4 LT	233	afs_get_volume(params->volume);
	234	as->volume = params->volume;
	235
	236	/* fill in the superblock */
	237	sb->s_blocksize = PAGE_CACHE_SIZE;
	238	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	239	sb->s_magic = AFS_FS_MAGIC;
	240	sb->s_op = &afs_super_ops;
	241	sb->s_fs_info = as;
	242
	243	/* allocate the root inode and dentry */
	244	fid.vid = as->volume->vid;
	245	fid.vnode = 1;
	246	fid.unique = 1;
08e0e7c8 DH	247	inode = afs_iget(sb, &fid);
	248	if (IS_ERR(inode))
	249	goto error_inode;
1da177e4 LT	250
	251	ret = -ENOMEM;
	252	root = d_alloc_root(inode);
	253	if (!root)
	254	goto error;
	255
	256	sb->s_root = root;
	257
08e0e7c8	258	_leave(" = 0");
1da177e4 LT	259	return 0;
1da177e4 LT	260
08e0e7c8 DH	261	error_inode:
	262	ret = PTR_ERR(inode);
	263	inode = NULL;
ec26815a	264	error:
1da177e4 LT	265	iput(inode);
	266	afs_put_volume(as->volume);
	267	kfree(as);
	268
	269	sb->s_fs_info = NULL;
	270
08e0e7c8	271	_leave(" = %d", ret);
1da177e4	272	return ret;
ec26815a	273	}
1da177e4	274
1da177e4 LT	275	/*
	276	* get an AFS superblock
	277	* - TODO: don't use get_sb_nodev(), but rather call sget() directly
	278	*/
454e2398 DH	279	static int afs_get_sb(struct file_system_type *fs_type,
	280	int flags,
	281	const char *dev_name,
	282	void *options,
	283	struct vfsmount *mnt)
1da177e4 LT	284	{
	285	struct afs_mount_params params;
	286	struct super_block *sb;
08e0e7c8	287	struct afs_volume *vol;
1da177e4 LT	288	int ret;
	289
	290	_enter(",,%s,%p", dev_name, options);
	291
	292	memset(&params, 0, sizeof(params));
	293
1da177e4 LT	294	/* parse the options */
	295	if (options) {
	296	ret = afs_super_parse_options(&params, options, &dev_name);
	297	if (ret < 0)
	298	goto error;
	299	if (!dev_name) {
	300	printk("kAFS: no volume name specified\n");
	301	ret = -EINVAL;
	302	goto error;
	303	}
	304	}
	305
	306	/* parse the device name */
08e0e7c8 DH	307	vol = afs_volume_lookup(dev_name, params.default_cell, params.rwpath);
	308	if (IS_ERR(vol)) {
	309	ret = PTR_ERR(vol);
1da177e4	310	goto error;
08e0e7c8 DH	311	}
	312
	313	params.volume = vol;
1da177e4 LT	314
	315	/* allocate a deviceless superblock */
	316	sb = sget(fs_type, afs_test_super, set_anon_super, &params);
08e0e7c8 DH	317	if (IS_ERR(sb)) {
08e0e7c8 DH	318	ret = PTR_ERR(sb);
1da177e4	319	goto error;
08e0e7c8	320	}
1da177e4 LT	321
	322	sb->s_flags = flags;
	323
9b04c997	324	ret = afs_fill_super(sb, &params, flags & MS_SILENT ? 1 : 0);
1da177e4 LT	325	if (ret < 0) {
	326	up_write(&sb->s_umount);
	327	deactivate_super(sb);
	328	goto error;
	329	}
	330	sb->s_flags \|= MS_ACTIVE;
454e2398	331	simple_set_mnt(mnt, sb);
1da177e4 LT	332
	333	afs_put_volume(params.volume);
	334	afs_put_cell(params.default_cell);
08e0e7c8	335	_leave(" = 0 [%p]", sb);
454e2398	336	return 0;
1da177e4	337
ec26815a	338	error:
1da177e4 LT	339	afs_put_volume(params.volume);
1da177e4 LT	340	afs_put_cell(params.default_cell);
1da177e4	341	_leave(" = %d", ret);
454e2398	342	return ret;
ec26815a	343	}
1da177e4	344
1da177e4 LT	345	/*
	346	* finish the unmounting process on the superblock
	347	*/
	348	static void afs_put_super(struct super_block *sb)
	349	{
	350	struct afs_super_info *as = sb->s_fs_info;
	351
	352	_enter("");
	353
	354	afs_put_volume(as->volume);
1da177e4 LT	355
1da177e4 LT	356	_leave("");
ec26815a	357	}
1da177e4	358
1da177e4 LT	359	/*
	360	* initialise an inode cache slab element prior to any use
	361	*/
e18b890b	362	static void afs_i_init_once(void _vnode, struct kmem_cache cachep,
1da177e4 LT	363	unsigned long flags)
1da177e4 LT	364	{
ec26815a	365	struct afs_vnode *vnode = _vnode;
1da177e4 LT	366
	367	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	368	SLAB_CTOR_CONSTRUCTOR) {
	369	memset(vnode, 0, sizeof(*vnode));
	370	inode_init_once(&vnode->vfs_inode);
	371	init_waitqueue_head(&vnode->update_waitq);
	372	spin_lock_init(&vnode->lock);
08e0e7c8 DH	373	INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
08e0e7c8 DH	374	mutex_init(&vnode->cb_broken_lock);
1da177e4	375	}
ec26815a	376	}
1da177e4	377
1da177e4 LT	378	/*
	379	* allocate an AFS inode struct from our slab cache
	380	*/
	381	static struct inode afs_alloc_inode(struct super_block sb)
	382	{
	383	struct afs_vnode *vnode;
	384
ec26815a	385	vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
1da177e4 LT	386	if (!vnode)
	387	return NULL;
	388
	389	atomic_inc(&afs_count_active_inodes);
	390
	391	memset(&vnode->fid, 0, sizeof(vnode->fid));
	392	memset(&vnode->status, 0, sizeof(vnode->status));
	393
	394	vnode->volume = NULL;
	395	vnode->update_cnt = 0;
	396	vnode->flags = 0;
08e0e7c8	397	vnode->cb_promised = false;
1da177e4 LT	398
1da177e4 LT	399	return &vnode->vfs_inode;
ec26815a	400	}
1da177e4	401
1da177e4 LT	402	/*
	403	* destroy an AFS inode struct
	404	*/
	405	static void afs_destroy_inode(struct inode *inode)
	406	{
08e0e7c8 DH	407	struct afs_vnode *vnode = AFS_FS_I(inode);
08e0e7c8 DH	408
1da177e4 LT	409	_enter("{%lu}", inode->i_ino);
1da177e4 LT	410
08e0e7c8 DH	411	_debug("DESTROY INODE %p", inode);
	412
	413	ASSERTCMP(vnode->server, ==, NULL);
	414
	415	kmem_cache_free(afs_inode_cachep, vnode);
1da177e4	416	atomic_dec(&afs_count_active_inodes);
ec26815a	417	}