[mirror_ubuntu-bionic-kernel.git] / fs / afs / inode.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 Woodhouse <dwmw2@cambridge.redhat.com>
 *          David Howells <dhowells@redhat.com>
 *
 */

#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 <linux/sched.h>
#include "internal.h"

struct afs_iget_data {
	struct afs_fid		fid;
	struct afs_volume	*volume;	/* volume on which resides */
};

/*
 * map the AFS file status to the inode member variables
 */
static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
{
	struct inode *inode = AFS_VNODE_TO_I(vnode);

	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
	       vnode->status.type,
	       vnode->status.nlink,
	       (unsigned long long) vnode->status.size,
	       vnode->status.data_version,
	       vnode->status.mode);

	switch (vnode->status.type) {
	case AFS_FTYPE_FILE:
		inode->i_mode	= S_IFREG | vnode->status.mode;
		inode->i_op	= &afs_file_inode_operations;
		inode->i_fop	= &afs_file_operations;
		break;
	case AFS_FTYPE_DIR:
		inode->i_mode	= S_IFDIR | vnode->status.mode;
		inode->i_op	= &afs_dir_inode_operations;
		inode->i_fop	= &afs_dir_file_operations;
		break;
	case AFS_FTYPE_SYMLINK:
		inode->i_mode	= S_IFLNK | vnode->status.mode;
		inode->i_op	= &page_symlink_inode_operations;
		break;
	default:
		printk("kAFS: AFS vnode with undefined type\n");
		return -EBADMSG;
	}

	inode->i_nlink		= vnode->status.nlink;
	inode->i_uid		= vnode->status.owner;
	inode->i_gid		= 0;
	inode->i_size		= vnode->status.size;
	inode->i_ctime.tv_sec	= vnode->status.mtime_server;
	inode->i_ctime.tv_nsec	= 0;
	inode->i_atime		= inode->i_mtime = inode->i_ctime;
	inode->i_blocks		= 0;
	inode->i_version	= vnode->fid.unique;
	inode->i_mapping->a_ops	= &afs_fs_aops;

	/* check to see whether a symbolic link is really a mountpoint */
	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
		afs_mntpt_check_symlink(vnode, key);

		if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
			inode->i_mode	= S_IFDIR | vnode->status.mode;
			inode->i_op	= &afs_mntpt_inode_operations;
			inode->i_fop	= &afs_mntpt_file_operations;
		}
	}

	return 0;
}

/*
 * iget5() comparator
 */
static int afs_iget5_test(struct inode *inode, void *opaque)
{
	struct afs_iget_data *data = opaque;

	return inode->i_ino == data->fid.vnode &&
		inode->i_version == data->fid.unique;
}

/*
 * iget5() inode initialiser
 */
static int afs_iget5_set(struct inode *inode, void *opaque)
{
	struct afs_iget_data *data = opaque;
	struct afs_vnode *vnode = AFS_FS_I(inode);

	inode->i_ino = data->fid.vnode;
	inode->i_version = data->fid.unique;
	vnode->fid = data->fid;
	vnode->volume = data->volume;

	return 0;
}

/*
 * inode retrieval
 */
struct inode *afs_iget(struct super_block *sb, struct key *key,
		       struct afs_fid *fid, struct afs_file_status *status,
		       struct afs_callback *cb)
{
	struct afs_iget_data data = { .fid = *fid };
	struct afs_super_info *as;
	struct afs_vnode *vnode;
	struct inode *inode;
	int ret;

	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);

	as = sb->s_fs_info;
	data.volume = as->volume;

	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
			     &data);
	if (!inode) {
		_leave(" = -ENOMEM");
		return ERR_PTR(-ENOMEM);
	}

	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	       inode, fid->vid, fid->vnode, fid->unique);

	vnode = AFS_FS_I(inode);

	/* deal with an existing inode */
	if (!(inode->i_state & I_NEW)) {
		_leave(" = %p", inode);
		return inode;
	}

#ifdef AFS_CACHING_SUPPORT
	/* set up caching before reading the status, as fetch-status reads the
	 * first page of symlinks to see if they're really mntpts */
	cachefs_acquire_cookie(vnode->volume->cache,
			       NULL,
			       vnode,
			       &vnode->cache);
#endif

	if (!status) {
		/* it's a remotely extant inode */
		set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
		ret = afs_vnode_fetch_status(vnode, NULL, key);
		if (ret < 0)
			goto bad_inode;
	} else {
		/* it's an inode we just created */
		memcpy(&vnode->status, status, sizeof(vnode->status));

		if (!cb) {
			/* it's a symlink we just created (the fileserver
			 * didn't give us a callback) */
			vnode->cb_version = 0;
			vnode->cb_expiry = 0;
			vnode->cb_type = 0;
			vnode->cb_expires = get_seconds();
		} else {
			vnode->cb_version = cb->version;
			vnode->cb_expiry = cb->expiry;
			vnode->cb_type = cb->type;
			vnode->cb_expires = vnode->cb_expiry + get_seconds();
		}
	}

	ret = afs_inode_map_status(vnode, key);
	if (ret < 0)
		goto bad_inode;

	/* success */
	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
	inode->i_flags |= S_NOATIME;
	unlock_new_inode(inode);
	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
	return inode;

	/* failure */
bad_inode:
	make_bad_inode(inode);
	unlock_new_inode(inode);
	iput(inode);

	_leave(" = %d [bad]", ret);
	return ERR_PTR(ret);
}

/*
 * mark the data attached to an inode as obsolete due to a write on the server
 * - might also want to ditch all the outstanding writes and dirty pages
 */
void afs_zap_data(struct afs_vnode *vnode)
{
	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);

	/* nuke all the non-dirty pages that aren't locked, mapped or being
	 * written back in a regular file and completely discard the pages in a
	 * directory or symlink */
	if (S_ISREG(vnode->vfs_inode.i_mode))
		invalidate_remote_inode(&vnode->vfs_inode);
	else
		invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
}

/*
 * validate a vnode/inode
 * - there are several things we need to check
 *   - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
 *     symlink)
 *   - parent dir metadata changed (security changes)
 *   - dentry data changed (write, truncate)
 *   - dentry metadata changed (security changes)
 */
int afs_validate(struct afs_vnode *vnode, struct key *key)
{
	int ret;

	_enter("{v={%x:%u} fl=%lx},%x",
	       vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	       key_serial(key));

	if (vnode->cb_promised &&
	    !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	    !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	    !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
		if (vnode->cb_expires < get_seconds() + 10) {
			_debug("callback expired");
			set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
		} else {
			goto valid;
		}
	}

	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
		goto valid;

	mutex_lock(&vnode->validate_lock);

	/* if the promise has expired, we need to check the server again to get
	 * a new promise - note that if the (parent) directory's metadata was
	 * changed then the security may be different and we may no longer have
	 * access */
	if (!vnode->cb_promised ||
	    test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
		_debug("not promised");
		ret = afs_vnode_fetch_status(vnode, NULL, key);
		if (ret < 0)
			goto error_unlock;
		_debug("new promise [fl=%lx]", vnode->flags);
	}

	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
		_debug("file already deleted");
		ret = -ESTALE;
		goto error_unlock;
	}

	/* if the vnode's data version number changed then its contents are
	 * different */
	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
		afs_zap_data(vnode);

	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	mutex_unlock(&vnode->validate_lock);
valid:
	_leave(" = 0");
	return 0;

error_unlock:
	mutex_unlock(&vnode->validate_lock);
	_leave(" = %d", ret);
	return ret;
}

/*
 * read the attributes of an inode
 */
int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
		      struct kstat *stat)
{
	struct inode *inode;

	inode = dentry->d_inode;

	_enter("{ ino=%lu v=%llu }", inode->i_ino,
		(unsigned long long)inode->i_version);

	generic_fillattr(inode, stat);
	return 0;
}

/*
 * clear an AFS inode
 */
void afs_clear_inode(struct inode *inode)
{
	struct afs_permits *permits;
	struct afs_vnode *vnode;

	vnode = AFS_FS_I(inode);

	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       vnode->cb_version,
	       vnode->cb_expiry,
	       vnode->cb_type);

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

	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);

	afs_give_up_callback(vnode);

	if (vnode->server) {
		spin_lock(&vnode->server->fs_lock);
		rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
		spin_unlock(&vnode->server->fs_lock);
		afs_put_server(vnode->server);
		vnode->server = NULL;
	}

	ASSERT(list_empty(&vnode->writebacks));
	ASSERT(!vnode->cb_promised);

#ifdef AFS_CACHING_SUPPORT
	cachefs_relinquish_cookie(vnode->cache, 0);
	vnode->cache = NULL;
#endif

	mutex_lock(&vnode->permits_lock);
	permits = vnode->permits;
	rcu_assign_pointer(vnode->permits, NULL);
	mutex_unlock(&vnode->permits_lock);
	if (permits)
		call_rcu(&permits->rcu, afs_zap_permits);

	_leave("");
}

/*
 * set the attributes of an inode
 */
int afs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	struct key *key;
	int ret;

	_enter("{%x:%u},{n=%s},%x",
	       vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
	       attr->ia_valid);

	if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
				ATTR_MTIME))) {
		_leave(" = 0 [unsupported]");
		return 0;
	}

	/* flush any dirty data outstanding on a regular file */
	if (S_ISREG(vnode->vfs_inode.i_mode)) {
		filemap_write_and_wait(vnode->vfs_inode.i_mapping);
		afs_writeback_all(vnode);
	}

	if (attr->ia_valid & ATTR_FILE) {
		key = attr->ia_file->private_data;
	} else {
		key = afs_request_key(vnode->volume->cell);
		if (IS_ERR(key)) {
			ret = PTR_ERR(key);
			goto error;
		}
	}

	ret = afs_vnode_setattr(vnode, key, attr);
	if (!(attr->ia_valid & ATTR_FILE))
		key_put(key);

error:
	_leave(" = %d", ret);
	return ret;
}
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 Woodhouse <dwmw2@cambridge.redhat.com>
	12	* David Howells <dhowells@redhat.com>
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
1da177e4 LT	19	#include <linux/slab.h>
	20	#include <linux/fs.h>
	21	#include <linux/pagemap.h>
e8edc6e0	22	#include <linux/sched.h>
1da177e4 LT	23	#include "internal.h"
	24
	25	struct afs_iget_data {
	26	struct afs_fid fid;
	27	struct afs_volume volume; / volume on which resides */
	28	};
	29
1da177e4 LT	30	/*
	31	* map the AFS file status to the inode member variables
	32	*/
00d3b7a4	33	static int afs_inode_map_status(struct afs_vnode vnode, struct key key)
1da177e4 LT	34	{
	35	struct inode *inode = AFS_VNODE_TO_I(vnode);
	36
260a9803	37	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
1da177e4 LT	38	vnode->status.type,
1da177e4 LT	39	vnode->status.nlink,
ba3e0e1a	40	(unsigned long long) vnode->status.size,
08e0e7c8	41	vnode->status.data_version,
1da177e4 LT	42	vnode->status.mode);
	43
	44	switch (vnode->status.type) {
	45	case AFS_FTYPE_FILE:
	46	inode->i_mode = S_IFREG \| vnode->status.mode;
	47	inode->i_op = &afs_file_inode_operations;
00d3b7a4	48	inode->i_fop = &afs_file_operations;
1da177e4 LT	49	break;
	50	case AFS_FTYPE_DIR:
	51	inode->i_mode = S_IFDIR \| vnode->status.mode;
	52	inode->i_op = &afs_dir_inode_operations;
	53	inode->i_fop = &afs_dir_file_operations;
	54	break;
	55	case AFS_FTYPE_SYMLINK:
	56	inode->i_mode = S_IFLNK \| vnode->status.mode;
	57	inode->i_op = &page_symlink_inode_operations;
	58	break;
	59	default:
	60	printk("kAFS: AFS vnode with undefined type\n");
	61	return -EBADMSG;
	62	}
	63
	64	inode->i_nlink = vnode->status.nlink;
	65	inode->i_uid = vnode->status.owner;
	66	inode->i_gid = 0;
	67	inode->i_size = vnode->status.size;
	68	inode->i_ctime.tv_sec = vnode->status.mtime_server;
	69	inode->i_ctime.tv_nsec = 0;
	70	inode->i_atime = inode->i_mtime = inode->i_ctime;
1da177e4 LT	71	inode->i_blocks = 0;
	72	inode->i_version = vnode->fid.unique;
	73	inode->i_mapping->a_ops = &afs_fs_aops;
	74
	75	/* check to see whether a symbolic link is really a mountpoint */
	76	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
00d3b7a4	77	afs_mntpt_check_symlink(vnode, key);
1da177e4	78
08e0e7c8	79	if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
1da177e4 LT	80	inode->i_mode = S_IFDIR \| vnode->status.mode;
	81	inode->i_op = &afs_mntpt_inode_operations;
	82	inode->i_fop = &afs_mntpt_file_operations;
	83	}
	84	}
	85
	86	return 0;
ec26815a	87	}
1da177e4	88
1da177e4 LT	89	/*
	90	* iget5() comparator
	91	*/
	92	static int afs_iget5_test(struct inode inode, void opaque)
	93	{
	94	struct afs_iget_data *data = opaque;
	95
	96	return inode->i_ino == data->fid.vnode &&
	97	inode->i_version == data->fid.unique;
ec26815a	98	}
1da177e4	99
1da177e4 LT	100	/*
	101	* iget5() inode initialiser
	102	*/
	103	static int afs_iget5_set(struct inode inode, void opaque)
	104	{
	105	struct afs_iget_data *data = opaque;
	106	struct afs_vnode *vnode = AFS_FS_I(inode);
	107
	108	inode->i_ino = data->fid.vnode;
	109	inode->i_version = data->fid.unique;
	110	vnode->fid = data->fid;
	111	vnode->volume = data->volume;
	112
	113	return 0;
ec26815a	114	}
1da177e4	115
1da177e4 LT	116	/*
	117	* inode retrieval
	118	*/
260a9803 DH	119	struct inode afs_iget(struct super_block sb, struct key *key,
	120	struct afs_fid fid, struct afs_file_status status,
	121	struct afs_callback *cb)
1da177e4 LT	122	{
	123	struct afs_iget_data data = { .fid = *fid };
	124	struct afs_super_info *as;
	125	struct afs_vnode *vnode;
	126	struct inode *inode;
	127	int ret;
	128
416351f2	129	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	130
	131	as = sb->s_fs_info;
	132	data.volume = as->volume;
	133
	134	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	135	&data);
	136	if (!inode) {
	137	_leave(" = -ENOMEM");
08e0e7c8	138	return ERR_PTR(-ENOMEM);
1da177e4 LT	139	}
1da177e4 LT	140
08e0e7c8 DH	141	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	142	inode, fid->vid, fid->vnode, fid->unique);
	143
1da177e4 LT	144	vnode = AFS_FS_I(inode);
	145
	146	/* deal with an existing inode */
	147	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	148	_leave(" = %p", inode);
08e0e7c8 DH	149	return inode;
1da177e4 LT	150	}
	151
	152	#ifdef AFS_CACHING_SUPPORT
	153	/* set up caching before reading the status, as fetch-status reads the
	154	* first page of symlinks to see if they're really mntpts */
	155	cachefs_acquire_cookie(vnode->volume->cache,
	156	NULL,
	157	vnode,
	158	&vnode->cache);
	159	#endif
	160
260a9803 DH	161	if (!status) {
	162	/* it's a remotely extant inode */
	163	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	164	ret = afs_vnode_fetch_status(vnode, NULL, key);
	165	if (ret < 0)
	166	goto bad_inode;
	167	} else {
	168	/* it's an inode we just created */
	169	memcpy(&vnode->status, status, sizeof(vnode->status));
	170
	171	if (!cb) {
	172	/* it's a symlink we just created (the fileserver
	173	* didn't give us a callback) */
	174	vnode->cb_version = 0;
	175	vnode->cb_expiry = 0;
	176	vnode->cb_type = 0;
	177	vnode->cb_expires = get_seconds();
	178	} else {
	179	vnode->cb_version = cb->version;
	180	vnode->cb_expiry = cb->expiry;
	181	vnode->cb_type = cb->type;
	182	vnode->cb_expires = vnode->cb_expiry + get_seconds();
	183	}
	184	}
	185
00d3b7a4	186	ret = afs_inode_map_status(vnode, key);
08e0e7c8	187	if (ret < 0)
1da177e4 LT	188	goto bad_inode;
	189
	190	/* success */
260a9803	191	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	192	inode->i_flags \|= S_NOATIME;
1da177e4	193	unlock_new_inode(inode);
08e0e7c8 DH	194	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	195	return inode;
1da177e4 LT	196
1da177e4 LT	197	/* failure */
ec26815a	198	bad_inode:
1da177e4 LT	199	make_bad_inode(inode);
	200	unlock_new_inode(inode);
	201	iput(inode);
	202
	203	_leave(" = %d [bad]", ret);
08e0e7c8	204	return ERR_PTR(ret);
ec26815a	205	}
1da177e4	206
416351f2 DH	207	/*
	208	* mark the data attached to an inode as obsolete due to a write on the server
	209	* - might also want to ditch all the outstanding writes and dirty pages
	210	*/
	211	void afs_zap_data(struct afs_vnode *vnode)
	212	{
0f300ca9	213	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2 DH	214
416351f2 DH	215	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	216	* written back in a regular file and completely discard the pages in a
	217	* directory or symlink */
	218	if (S_ISREG(vnode->vfs_inode.i_mode))
	219	invalidate_remote_inode(&vnode->vfs_inode);
	220	else
	221	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	222	}
416351f2 DH	223
260a9803 DH	224	/*
	225	* validate a vnode/inode
	226	* - there are several things we need to check
	227	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	228	* symlink)
	229	* - parent dir metadata changed (security changes)
	230	* - dentry data changed (write, truncate)
	231	* - dentry metadata changed (security changes)
	232	*/
	233	int afs_validate(struct afs_vnode vnode, struct key key)
	234	{
	235	int ret;
	236
	237	_enter("{v={%x:%u} fl=%lx},%x",
	238	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	239	key_serial(key));
	240
	241	if (vnode->cb_promised &&
	242	!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	243	!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	244	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
	245	if (vnode->cb_expires < get_seconds() + 10) {
	246	_debug("callback expired");
	247	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	248	} else {
	249	goto valid;
	250	}
	251	}
	252
	253	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	254	goto valid;
	255
	256	mutex_lock(&vnode->validate_lock);
	257
	258	/* if the promise has expired, we need to check the server again to get
	259	* a new promise - note that if the (parent) directory's metadata was
	260	* changed then the security may be different and we may no longer have
	261	* access */
	262	if (!vnode->cb_promised \|\|
	263	test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
	264	_debug("not promised");
	265	ret = afs_vnode_fetch_status(vnode, NULL, key);
	266	if (ret < 0)
	267	goto error_unlock;
	268	_debug("new promise [fl=%lx]", vnode->flags);
	269	}
	270
	271	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	272	_debug("file already deleted");
	273	ret = -ESTALE;
	274	goto error_unlock;
	275	}
	276
	277	/* if the vnode's data version number changed then its contents are
	278	* different */
416351f2 DH	279	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	280	afs_zap_data(vnode);
260a9803 DH	281
	282	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	283	mutex_unlock(&vnode->validate_lock);
	284	valid:
	285	_leave(" = 0");
	286	return 0;
	287
	288	error_unlock:
	289	mutex_unlock(&vnode->validate_lock);
	290	_leave(" = %d", ret);
	291	return ret;
	292	}
	293
1da177e4 LT	294	/*
	295	* read the attributes of an inode
	296	*/
416351f2	297	int afs_getattr(struct vfsmount mnt, struct dentry dentry,
1da177e4 LT	298	struct kstat *stat)
1da177e4 LT	299	{
1da177e4	300	struct inode *inode;
1da177e4 LT	301
	302	inode = dentry->d_inode;
	303
7a224228 JNC	304	_enter("{ ino=%lu v=%llu }", inode->i_ino,
7a224228 JNC	305	(unsigned long long)inode->i_version);
1da177e4	306
1da177e4	307	generic_fillattr(inode, stat);
1da177e4	308	return 0;
ec26815a	309	}
1da177e4	310
1da177e4 LT	311	/*
	312	* clear an AFS inode
	313	*/
	314	void afs_clear_inode(struct inode *inode)
	315	{
00d3b7a4	316	struct afs_permits *permits;
1da177e4 LT	317	struct afs_vnode *vnode;
	318
	319	vnode = AFS_FS_I(inode);
	320
416351f2	321	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
260a9803	322	vnode->fid.vid,
1da177e4	323	vnode->fid.vnode,
260a9803	324	vnode->fid.unique,
1da177e4 LT	325	vnode->cb_version,
1da177e4 LT	326	vnode->cb_expiry,
08e0e7c8	327	vnode->cb_type);
1da177e4	328
08e0e7c8 DH	329	_debug("CLEAR INODE %p", inode);
	330
	331	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	332
	333	afs_give_up_callback(vnode);
	334
	335	if (vnode->server) {
	336	spin_lock(&vnode->server->fs_lock);
	337	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	338	spin_unlock(&vnode->server->fs_lock);
	339	afs_put_server(vnode->server);
	340	vnode->server = NULL;
	341	}
1da177e4	342
31143d5d	343	ASSERT(list_empty(&vnode->writebacks));
08e0e7c8	344	ASSERT(!vnode->cb_promised);
1da177e4 LT	345
	346	#ifdef AFS_CACHING_SUPPORT
	347	cachefs_relinquish_cookie(vnode->cache, 0);
	348	vnode->cache = NULL;
	349	#endif
	350
00d3b7a4 DH	351	mutex_lock(&vnode->permits_lock);
	352	permits = vnode->permits;
	353	rcu_assign_pointer(vnode->permits, NULL);
	354	mutex_unlock(&vnode->permits_lock);
	355	if (permits)
	356	call_rcu(&permits->rcu, afs_zap_permits);
	357
1da177e4	358	_leave("");
ec26815a	359	}
31143d5d DH	360
	361	/*
	362	* set the attributes of an inode
	363	*/
	364	int afs_setattr(struct dentry dentry, struct iattr attr)
	365	{
	366	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	367	struct key *key;
	368	int ret;
	369
	370	_enter("{%x:%u},{n=%s},%x",
	371	vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
	372	attr->ia_valid);
	373
	374	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	375	ATTR_MTIME))) {
	376	_leave(" = 0 [unsupported]");
	377	return 0;
	378	}
	379
	380	/* flush any dirty data outstanding on a regular file */
	381	if (S_ISREG(vnode->vfs_inode.i_mode)) {
	382	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
	383	afs_writeback_all(vnode);
	384	}
	385
	386	if (attr->ia_valid & ATTR_FILE) {
	387	key = attr->ia_file->private_data;
	388	} else {
	389	key = afs_request_key(vnode->volume->cell);
	390	if (IS_ERR(key)) {
	391	ret = PTR_ERR(key);
	392	goto error;
	393	}
	394	}
	395
	396	ret = afs_vnode_setattr(vnode, key, attr);
	397	if (!(attr->ia_valid & ATTR_FILE))
	398	key_put(key);
	399
	400	error:
	401	_leave(" = %d", ret);
	402	return ret;
	403	}