[GitHub/mt8127/android_kernel_alcatel_ttab.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@infradead.org>
 *          David Howells <dhowells@redhat.com>
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.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;
	}

#ifdef CONFIG_AFS_FSCACHE
	if (vnode->status.size != inode->i_size)
		fscache_attr_changed(vnode->cache);
#endif

	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;
	}

	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();
		}
	}

	/* set up caching before mapping the status, as map-status reads the
	 * first page of symlinks to see if they're really mountpoints */
	inode->i_size = vnode->status.size;
#ifdef CONFIG_AFS_FSCACHE
	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
					      &afs_vnode_cache_index_def,
					      vnode);
#endif

	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:
#ifdef CONFIG_AFS_FSCACHE
	fscache_relinquish_cookie(vnode->cache, 0);
	vnode->cache = NULL;
#endif
	iget_failed(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 CONFIG_AFS_FSCACHE
	fscache_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	*
44d1b980	11	* Authors: David Woodhouse <dwmw2@infradead.org>
1da177e4 LT	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/fs.h>
1da177e4 LT	20	#include <linux/pagemap.h>
e8edc6e0	21	#include <linux/sched.h>
1da177e4 LT	22	#include "internal.h"
	23
	24	struct afs_iget_data {
	25	struct afs_fid fid;
	26	struct afs_volume volume; / volume on which resides */
	27	};
	28
1da177e4 LT	29	/*
	30	* map the AFS file status to the inode member variables
	31	*/
00d3b7a4	32	static int afs_inode_map_status(struct afs_vnode vnode, struct key key)
1da177e4 LT	33	{
	34	struct inode *inode = AFS_VNODE_TO_I(vnode);
	35
260a9803	36	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
1da177e4 LT	37	vnode->status.type,
1da177e4 LT	38	vnode->status.nlink,
ba3e0e1a	39	(unsigned long long) vnode->status.size,
08e0e7c8	40	vnode->status.data_version,
1da177e4 LT	41	vnode->status.mode);
	42
	43	switch (vnode->status.type) {
	44	case AFS_FTYPE_FILE:
	45	inode->i_mode = S_IFREG \| vnode->status.mode;
	46	inode->i_op = &afs_file_inode_operations;
00d3b7a4	47	inode->i_fop = &afs_file_operations;
1da177e4 LT	48	break;
	49	case AFS_FTYPE_DIR:
	50	inode->i_mode = S_IFDIR \| vnode->status.mode;
	51	inode->i_op = &afs_dir_inode_operations;
	52	inode->i_fop = &afs_dir_file_operations;
	53	break;
	54	case AFS_FTYPE_SYMLINK:
	55	inode->i_mode = S_IFLNK \| vnode->status.mode;
	56	inode->i_op = &page_symlink_inode_operations;
	57	break;
	58	default:
	59	printk("kAFS: AFS vnode with undefined type\n");
	60	return -EBADMSG;
	61	}
	62
9b3f26c9 DH	63	#ifdef CONFIG_AFS_FSCACHE
	64	if (vnode->status.size != inode->i_size)
	65	fscache_attr_changed(vnode->cache);
	66	#endif
	67
1da177e4 LT	68	inode->i_nlink = vnode->status.nlink;
	69	inode->i_uid = vnode->status.owner;
	70	inode->i_gid = 0;
	71	inode->i_size = vnode->status.size;
	72	inode->i_ctime.tv_sec = vnode->status.mtime_server;
	73	inode->i_ctime.tv_nsec = 0;
	74	inode->i_atime = inode->i_mtime = inode->i_ctime;
1da177e4 LT	75	inode->i_blocks = 0;
	76	inode->i_version = vnode->fid.unique;
	77	inode->i_mapping->a_ops = &afs_fs_aops;
	78
	79	/* check to see whether a symbolic link is really a mountpoint */
	80	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
00d3b7a4	81	afs_mntpt_check_symlink(vnode, key);
1da177e4	82
08e0e7c8	83	if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
1da177e4 LT	84	inode->i_mode = S_IFDIR \| vnode->status.mode;
	85	inode->i_op = &afs_mntpt_inode_operations;
	86	inode->i_fop = &afs_mntpt_file_operations;
	87	}
	88	}
	89
	90	return 0;
ec26815a	91	}
1da177e4	92
1da177e4 LT	93	/*
	94	* iget5() comparator
	95	*/
	96	static int afs_iget5_test(struct inode inode, void opaque)
	97	{
	98	struct afs_iget_data *data = opaque;
	99
	100	return inode->i_ino == data->fid.vnode &&
	101	inode->i_version == data->fid.unique;
ec26815a	102	}
1da177e4	103
1da177e4 LT	104	/*
	105	* iget5() inode initialiser
	106	*/
	107	static int afs_iget5_set(struct inode inode, void opaque)
	108	{
	109	struct afs_iget_data *data = opaque;
	110	struct afs_vnode *vnode = AFS_FS_I(inode);
	111
	112	inode->i_ino = data->fid.vnode;
	113	inode->i_version = data->fid.unique;
	114	vnode->fid = data->fid;
	115	vnode->volume = data->volume;
	116
	117	return 0;
ec26815a	118	}
1da177e4	119
1da177e4 LT	120	/*
	121	* inode retrieval
	122	*/
260a9803 DH	123	struct inode afs_iget(struct super_block sb, struct key *key,
	124	struct afs_fid fid, struct afs_file_status status,
	125	struct afs_callback *cb)
1da177e4 LT	126	{
	127	struct afs_iget_data data = { .fid = *fid };
	128	struct afs_super_info *as;
	129	struct afs_vnode *vnode;
	130	struct inode *inode;
	131	int ret;
	132
416351f2	133	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	134
	135	as = sb->s_fs_info;
	136	data.volume = as->volume;
	137
	138	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	139	&data);
	140	if (!inode) {
	141	_leave(" = -ENOMEM");
08e0e7c8	142	return ERR_PTR(-ENOMEM);
1da177e4 LT	143	}
1da177e4 LT	144
08e0e7c8 DH	145	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	146	inode, fid->vid, fid->vnode, fid->unique);
	147
1da177e4 LT	148	vnode = AFS_FS_I(inode);
	149
	150	/* deal with an existing inode */
	151	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	152	_leave(" = %p", inode);
08e0e7c8 DH	153	return inode;
1da177e4 LT	154	}
1da177e4 LT	155
260a9803 DH	156	if (!status) {
	157	/* it's a remotely extant inode */
	158	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	159	ret = afs_vnode_fetch_status(vnode, NULL, key);
	160	if (ret < 0)
	161	goto bad_inode;
	162	} else {
	163	/* it's an inode we just created */
	164	memcpy(&vnode->status, status, sizeof(vnode->status));
	165
	166	if (!cb) {
	167	/* it's a symlink we just created (the fileserver
	168	* didn't give us a callback) */
	169	vnode->cb_version = 0;
	170	vnode->cb_expiry = 0;
	171	vnode->cb_type = 0;
	172	vnode->cb_expires = get_seconds();
	173	} else {
	174	vnode->cb_version = cb->version;
	175	vnode->cb_expiry = cb->expiry;
	176	vnode->cb_type = cb->type;
	177	vnode->cb_expires = vnode->cb_expiry + get_seconds();
	178	}
	179	}
	180
9b3f26c9 DH	181	/* set up caching before mapping the status, as map-status reads the
	182	* first page of symlinks to see if they're really mountpoints */
	183	inode->i_size = vnode->status.size;
	184	#ifdef CONFIG_AFS_FSCACHE
	185	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	186	&afs_vnode_cache_index_def,
	187	vnode);
	188	#endif
	189
00d3b7a4	190	ret = afs_inode_map_status(vnode, key);
08e0e7c8	191	if (ret < 0)
1da177e4 LT	192	goto bad_inode;
	193
	194	/* success */
260a9803	195	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	196	inode->i_flags \|= S_NOATIME;
1da177e4	197	unlock_new_inode(inode);
08e0e7c8 DH	198	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	199	return inode;
1da177e4 LT	200
1da177e4 LT	201	/* failure */
ec26815a	202	bad_inode:
9b3f26c9 DH	203	#ifdef CONFIG_AFS_FSCACHE
	204	fscache_relinquish_cookie(vnode->cache, 0);
	205	vnode->cache = NULL;
	206	#endif
aa7fa240	207	iget_failed(inode);
1da177e4	208	_leave(" = %d [bad]", ret);
08e0e7c8	209	return ERR_PTR(ret);
ec26815a	210	}
1da177e4	211
416351f2 DH	212	/*
	213	* mark the data attached to an inode as obsolete due to a write on the server
	214	* - might also want to ditch all the outstanding writes and dirty pages
	215	*/
	216	void afs_zap_data(struct afs_vnode *vnode)
	217	{
0f300ca9	218	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2 DH	219
416351f2 DH	220	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	221	* written back in a regular file and completely discard the pages in a
	222	* directory or symlink */
	223	if (S_ISREG(vnode->vfs_inode.i_mode))
	224	invalidate_remote_inode(&vnode->vfs_inode);
	225	else
	226	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	227	}
416351f2 DH	228
260a9803 DH	229	/*
	230	* validate a vnode/inode
	231	* - there are several things we need to check
	232	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	233	* symlink)
	234	* - parent dir metadata changed (security changes)
	235	* - dentry data changed (write, truncate)
	236	* - dentry metadata changed (security changes)
	237	*/
	238	int afs_validate(struct afs_vnode vnode, struct key key)
	239	{
	240	int ret;
	241
	242	_enter("{v={%x:%u} fl=%lx},%x",
	243	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	244	key_serial(key));
	245
	246	if (vnode->cb_promised &&
	247	!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	248	!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	249	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
	250	if (vnode->cb_expires < get_seconds() + 10) {
	251	_debug("callback expired");
	252	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	253	} else {
	254	goto valid;
	255	}
	256	}
	257
	258	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	259	goto valid;
	260
	261	mutex_lock(&vnode->validate_lock);
	262
	263	/* if the promise has expired, we need to check the server again to get
	264	* a new promise - note that if the (parent) directory's metadata was
	265	* changed then the security may be different and we may no longer have
	266	* access */
	267	if (!vnode->cb_promised \|\|
	268	test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
	269	_debug("not promised");
	270	ret = afs_vnode_fetch_status(vnode, NULL, key);
	271	if (ret < 0)
	272	goto error_unlock;
	273	_debug("new promise [fl=%lx]", vnode->flags);
	274	}
	275
	276	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	277	_debug("file already deleted");
	278	ret = -ESTALE;
	279	goto error_unlock;
	280	}
	281
	282	/* if the vnode's data version number changed then its contents are
	283	* different */
416351f2 DH	284	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	285	afs_zap_data(vnode);
260a9803 DH	286
	287	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	288	mutex_unlock(&vnode->validate_lock);
	289	valid:
	290	_leave(" = 0");
	291	return 0;
	292
	293	error_unlock:
	294	mutex_unlock(&vnode->validate_lock);
	295	_leave(" = %d", ret);
	296	return ret;
	297	}
	298
1da177e4 LT	299	/*
	300	* read the attributes of an inode
	301	*/
416351f2	302	int afs_getattr(struct vfsmount mnt, struct dentry dentry,
1da177e4 LT	303	struct kstat *stat)
1da177e4 LT	304	{
1da177e4	305	struct inode *inode;
1da177e4 LT	306
	307	inode = dentry->d_inode;
	308
7a224228 JNC	309	_enter("{ ino=%lu v=%llu }", inode->i_ino,
7a224228 JNC	310	(unsigned long long)inode->i_version);
1da177e4	311
1da177e4	312	generic_fillattr(inode, stat);
1da177e4	313	return 0;
ec26815a	314	}
1da177e4	315
1da177e4 LT	316	/*
	317	* clear an AFS inode
	318	*/
	319	void afs_clear_inode(struct inode *inode)
	320	{
00d3b7a4	321	struct afs_permits *permits;
1da177e4 LT	322	struct afs_vnode *vnode;
	323
	324	vnode = AFS_FS_I(inode);
	325
416351f2	326	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
260a9803	327	vnode->fid.vid,
1da177e4	328	vnode->fid.vnode,
260a9803	329	vnode->fid.unique,
1da177e4 LT	330	vnode->cb_version,
1da177e4 LT	331	vnode->cb_expiry,
08e0e7c8	332	vnode->cb_type);
1da177e4	333
08e0e7c8 DH	334	_debug("CLEAR INODE %p", inode);
	335
	336	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	337
	338	afs_give_up_callback(vnode);
	339
	340	if (vnode->server) {
	341	spin_lock(&vnode->server->fs_lock);
	342	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	343	spin_unlock(&vnode->server->fs_lock);
	344	afs_put_server(vnode->server);
	345	vnode->server = NULL;
	346	}
1da177e4	347
31143d5d	348	ASSERT(list_empty(&vnode->writebacks));
08e0e7c8	349	ASSERT(!vnode->cb_promised);
1da177e4	350
9b3f26c9 DH	351	#ifdef CONFIG_AFS_FSCACHE
9b3f26c9 DH	352	fscache_relinquish_cookie(vnode->cache, 0);
1da177e4 LT	353	vnode->cache = NULL;
	354	#endif
	355
00d3b7a4 DH	356	mutex_lock(&vnode->permits_lock);
	357	permits = vnode->permits;
	358	rcu_assign_pointer(vnode->permits, NULL);
	359	mutex_unlock(&vnode->permits_lock);
	360	if (permits)
	361	call_rcu(&permits->rcu, afs_zap_permits);
	362
1da177e4	363	_leave("");
ec26815a	364	}
31143d5d DH	365
	366	/*
	367	* set the attributes of an inode
	368	*/
	369	int afs_setattr(struct dentry dentry, struct iattr attr)
	370	{
	371	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	372	struct key *key;
	373	int ret;
	374
	375	_enter("{%x:%u},{n=%s},%x",
	376	vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
	377	attr->ia_valid);
	378
	379	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	380	ATTR_MTIME))) {
	381	_leave(" = 0 [unsupported]");
	382	return 0;
	383	}
	384
	385	/* flush any dirty data outstanding on a regular file */
	386	if (S_ISREG(vnode->vfs_inode.i_mode)) {
	387	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
	388	afs_writeback_all(vnode);
	389	}
	390
	391	if (attr->ia_valid & ATTR_FILE) {
	392	key = attr->ia_file->private_data;
	393	} else {
	394	key = afs_request_key(vnode->volume->cell);
	395	if (IS_ERR(key)) {
	396	ret = PTR_ERR(key);
	397	goto error;
	398	}
	399	}
	400
	401	ret = afs_vnode_setattr(vnode, key, attr);
	402	if (!(attr->ia_valid & ATTR_FILE))
	403	key_put(key);
	404
	405	error:
	406	_leave(" = %d", ret);
	407	return ret;
	408	}