[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@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 <linux/mount.h>
#include <linux/namei.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() comparator for inode created by autocell operations
 *
 * These pseudo inodes don't match anything.
 */
static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
{
	return 0;
}

/*
 * 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 for autocell
 */
struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
				int namesz, struct key *key)
{
	struct afs_iget_data data;
	struct afs_super_info *as;
	struct afs_vnode *vnode;
	struct super_block *sb;
	struct inode *inode;
	static atomic_t afs_autocell_ino;

	_enter("{%x:%u},%*.*s,",
	       AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
	       namesz, namesz, dev_name ?: "");

	sb = dir->i_sb;
	as = sb->s_fs_info;
	data.volume = as->volume;
	data.fid.vid = as->volume->vid;
	data.fid.unique = 0;
	data.fid.vnode = 0;

	inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
			     afs_iget5_autocell_test, afs_iget5_set,
			     &data);
	if (!inode) {
		_leave(" = -ENOMEM");
		return ERR_PTR(-ENOMEM);
	}

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

	vnode = AFS_FS_I(inode);

	/* there shouldn't be an existing inode */
	BUG_ON(!(inode->i_state & I_NEW));

	inode->i_size		= 0;
	inode->i_mode		= S_IFDIR | S_IRUGO | S_IXUGO;
	inode->i_op		= &afs_autocell_inode_operations;
	inode->i_nlink		= 2;
	inode->i_uid		= 0;
	inode->i_gid		= 0;
	inode->i_ctime.tv_sec	= get_seconds();
	inode->i_ctime.tv_nsec	= 0;
	inode->i_atime		= inode->i_mtime = inode->i_ctime;
	inode->i_blocks		= 0;
	inode->i_version	= 0;
	inode->i_generation	= 0;

	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
	unlock_new_inode(inode);
	_leave(" = %p", inode);
	return inode;
}

/*
 * 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;
}

/*
 * discard an AFS inode
 */
int afs_drop_inode(struct inode *inode)
{
	_enter("");

	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
		return generic_delete_inode(inode);
	else
		return generic_drop_inode(inode);
}

/*
 * clear an AFS inode
 */
void afs_evict_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);

	truncate_inode_pages(&inode->i_data, 0);
	end_writeback(inode);

	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>
bec5eb61	22	#include <linux/mount.h>
bec5eb61	23	#include <linux/namei.h>
1da177e4 LT	24	#include "internal.h"
	25
	26	struct afs_iget_data {
	27	struct afs_fid fid;
	28	struct afs_volume volume; / volume on which resides */
	29	};
	30
1da177e4 LT	31	/*
	32	* map the AFS file status to the inode member variables
	33	*/
00d3b7a4	34	static int afs_inode_map_status(struct afs_vnode vnode, struct key key)
1da177e4 LT	35	{
	36	struct inode *inode = AFS_VNODE_TO_I(vnode);
	37
260a9803	38	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
1da177e4 LT	39	vnode->status.type,
1da177e4 LT	40	vnode->status.nlink,
ba3e0e1a	41	(unsigned long long) vnode->status.size,
08e0e7c8	42	vnode->status.data_version,
1da177e4 LT	43	vnode->status.mode);
	44
	45	switch (vnode->status.type) {
	46	case AFS_FTYPE_FILE:
	47	inode->i_mode = S_IFREG \| vnode->status.mode;
	48	inode->i_op = &afs_file_inode_operations;
00d3b7a4	49	inode->i_fop = &afs_file_operations;
1da177e4 LT	50	break;
	51	case AFS_FTYPE_DIR:
	52	inode->i_mode = S_IFDIR \| vnode->status.mode;
	53	inode->i_op = &afs_dir_inode_operations;
	54	inode->i_fop = &afs_dir_file_operations;
	55	break;
	56	case AFS_FTYPE_SYMLINK:
	57	inode->i_mode = S_IFLNK \| vnode->status.mode;
	58	inode->i_op = &page_symlink_inode_operations;
	59	break;
	60	default:
	61	printk("kAFS: AFS vnode with undefined type\n");
	62	return -EBADMSG;
	63	}
	64
9b3f26c9 DH	65	#ifdef CONFIG_AFS_FSCACHE
	66	if (vnode->status.size != inode->i_size)
	67	fscache_attr_changed(vnode->cache);
	68	#endif
	69
1da177e4 LT	70	inode->i_nlink = vnode->status.nlink;
	71	inode->i_uid = vnode->status.owner;
	72	inode->i_gid = 0;
	73	inode->i_size = vnode->status.size;
	74	inode->i_ctime.tv_sec = vnode->status.mtime_server;
	75	inode->i_ctime.tv_nsec = 0;
	76	inode->i_atime = inode->i_mtime = inode->i_ctime;
1da177e4 LT	77	inode->i_blocks = 0;
	78	inode->i_version = vnode->fid.unique;
	79	inode->i_mapping->a_ops = &afs_fs_aops;
	80
	81	/* check to see whether a symbolic link is really a mountpoint */
	82	if (vnode->status.type == AFS_FTYPE_SYMLINK) {
00d3b7a4	83	afs_mntpt_check_symlink(vnode, key);
1da177e4	84
08e0e7c8	85	if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
1da177e4 LT	86	inode->i_mode = S_IFDIR \| vnode->status.mode;
	87	inode->i_op = &afs_mntpt_inode_operations;
	88	inode->i_fop = &afs_mntpt_file_operations;
	89	}
	90	}
	91
	92	return 0;
ec26815a	93	}
1da177e4	94
1da177e4 LT	95	/*
	96	* iget5() comparator
	97	*/
	98	static int afs_iget5_test(struct inode inode, void opaque)
	99	{
	100	struct afs_iget_data *data = opaque;
	101
	102	return inode->i_ino == data->fid.vnode &&
	103	inode->i_version == data->fid.unique;
ec26815a	104	}
1da177e4	105
bec5eb61	106	/*
	107	* iget5() comparator for inode created by autocell operations
	108	*
	109	* These pseudo inodes don't match anything.
	110	*/
	111	static int afs_iget5_autocell_test(struct inode inode, void opaque)
	112	{
	113	return 0;
	114	}
	115
1da177e4 LT	116	/*
	117	* iget5() inode initialiser
	118	*/
	119	static int afs_iget5_set(struct inode inode, void opaque)
	120	{
	121	struct afs_iget_data *data = opaque;
	122	struct afs_vnode *vnode = AFS_FS_I(inode);
	123
	124	inode->i_ino = data->fid.vnode;
	125	inode->i_version = data->fid.unique;
	126	vnode->fid = data->fid;
	127	vnode->volume = data->volume;
	128
	129	return 0;
ec26815a	130	}
1da177e4	131
bec5eb61	132	/*
	133	* inode retrieval for autocell
	134	*/
	135	struct inode afs_iget_autocell(struct inode dir, const char *dev_name,
	136	int namesz, struct key *key)
	137	{
	138	struct afs_iget_data data;
	139	struct afs_super_info *as;
	140	struct afs_vnode *vnode;
	141	struct super_block *sb;
	142	struct inode *inode;
	143	static atomic_t afs_autocell_ino;
	144
	145	_enter("{%x:%u},%.s,",
	146	AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
	147	namesz, namesz, dev_name ?: "");
	148
	149	sb = dir->i_sb;
	150	as = sb->s_fs_info;
	151	data.volume = as->volume;
	152	data.fid.vid = as->volume->vid;
	153	data.fid.unique = 0;
	154	data.fid.vnode = 0;
	155
	156	inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
	157	afs_iget5_autocell_test, afs_iget5_set,
	158	&data);
	159	if (!inode) {
	160	_leave(" = -ENOMEM");
	161	return ERR_PTR(-ENOMEM);
	162	}
	163
	164	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
	165	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	166	data.fid.unique);
	167
	168	vnode = AFS_FS_I(inode);
	169
	170	/* there shouldn't be an existing inode */
	171	BUG_ON(!(inode->i_state & I_NEW));
	172
	173	inode->i_size = 0;
	174	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
	175	inode->i_op = &afs_autocell_inode_operations;
	176	inode->i_nlink = 2;
	177	inode->i_uid = 0;
	178	inode->i_gid = 0;
	179	inode->i_ctime.tv_sec = get_seconds();
	180	inode->i_ctime.tv_nsec = 0;
	181	inode->i_atime = inode->i_mtime = inode->i_ctime;
	182	inode->i_blocks = 0;
	183	inode->i_version = 0;
	184	inode->i_generation = 0;
	185
	186	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
d18610b0 DH	187	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
d18610b0 DH	188	inode->i_flags \|= S_AUTOMOUNT \| S_NOATIME;
bec5eb61	189	unlock_new_inode(inode);
	190	_leave(" = %p", inode);
	191	return inode;
	192	}
	193
1da177e4 LT	194	/*
	195	* inode retrieval
	196	*/
260a9803 DH	197	struct inode afs_iget(struct super_block sb, struct key *key,
	198	struct afs_fid fid, struct afs_file_status status,
	199	struct afs_callback *cb)
1da177e4 LT	200	{
	201	struct afs_iget_data data = { .fid = *fid };
	202	struct afs_super_info *as;
	203	struct afs_vnode *vnode;
	204	struct inode *inode;
	205	int ret;
	206
416351f2	207	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	208
	209	as = sb->s_fs_info;
	210	data.volume = as->volume;
	211
	212	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	213	&data);
	214	if (!inode) {
	215	_leave(" = -ENOMEM");
08e0e7c8	216	return ERR_PTR(-ENOMEM);
1da177e4 LT	217	}
1da177e4 LT	218
08e0e7c8 DH	219	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	220	inode, fid->vid, fid->vnode, fid->unique);
	221
1da177e4 LT	222	vnode = AFS_FS_I(inode);
	223
	224	/* deal with an existing inode */
	225	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	226	_leave(" = %p", inode);
08e0e7c8 DH	227	return inode;
1da177e4 LT	228	}
1da177e4 LT	229
260a9803 DH	230	if (!status) {
	231	/* it's a remotely extant inode */
	232	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	233	ret = afs_vnode_fetch_status(vnode, NULL, key);
	234	if (ret < 0)
	235	goto bad_inode;
	236	} else {
	237	/* it's an inode we just created */
	238	memcpy(&vnode->status, status, sizeof(vnode->status));
	239
	240	if (!cb) {
	241	/* it's a symlink we just created (the fileserver
	242	* didn't give us a callback) */
	243	vnode->cb_version = 0;
	244	vnode->cb_expiry = 0;
	245	vnode->cb_type = 0;
	246	vnode->cb_expires = get_seconds();
	247	} else {
	248	vnode->cb_version = cb->version;
	249	vnode->cb_expiry = cb->expiry;
	250	vnode->cb_type = cb->type;
	251	vnode->cb_expires = vnode->cb_expiry + get_seconds();
	252	}
	253	}
	254
9b3f26c9 DH	255	/* set up caching before mapping the status, as map-status reads the
	256	* first page of symlinks to see if they're really mountpoints */
	257	inode->i_size = vnode->status.size;
	258	#ifdef CONFIG_AFS_FSCACHE
	259	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	260	&afs_vnode_cache_index_def,
	261	vnode);
	262	#endif
	263
00d3b7a4	264	ret = afs_inode_map_status(vnode, key);
08e0e7c8	265	if (ret < 0)
1da177e4 LT	266	goto bad_inode;
	267
	268	/* success */
260a9803	269	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	270	inode->i_flags \|= S_NOATIME;
1da177e4	271	unlock_new_inode(inode);
08e0e7c8 DH	272	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	273	return inode;
1da177e4 LT	274
1da177e4 LT	275	/* failure */
ec26815a	276	bad_inode:
9b3f26c9 DH	277	#ifdef CONFIG_AFS_FSCACHE
	278	fscache_relinquish_cookie(vnode->cache, 0);
	279	vnode->cache = NULL;
	280	#endif
aa7fa240	281	iget_failed(inode);
1da177e4	282	_leave(" = %d [bad]", ret);
08e0e7c8	283	return ERR_PTR(ret);
ec26815a	284	}
1da177e4	285
416351f2 DH	286	/*
	287	* mark the data attached to an inode as obsolete due to a write on the server
	288	* - might also want to ditch all the outstanding writes and dirty pages
	289	*/
	290	void afs_zap_data(struct afs_vnode *vnode)
	291	{
0f300ca9	292	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2 DH	293
416351f2 DH	294	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	295	* written back in a regular file and completely discard the pages in a
	296	* directory or symlink */
	297	if (S_ISREG(vnode->vfs_inode.i_mode))
	298	invalidate_remote_inode(&vnode->vfs_inode);
	299	else
	300	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	301	}
416351f2 DH	302
260a9803 DH	303	/*
	304	* validate a vnode/inode
	305	* - there are several things we need to check
	306	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	307	* symlink)
	308	* - parent dir metadata changed (security changes)
	309	* - dentry data changed (write, truncate)
	310	* - dentry metadata changed (security changes)
	311	*/
	312	int afs_validate(struct afs_vnode vnode, struct key key)
	313	{
	314	int ret;
	315
	316	_enter("{v={%x:%u} fl=%lx},%x",
	317	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	318	key_serial(key));
	319
	320	if (vnode->cb_promised &&
	321	!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	322	!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	323	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
	324	if (vnode->cb_expires < get_seconds() + 10) {
	325	_debug("callback expired");
	326	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	327	} else {
	328	goto valid;
	329	}
	330	}
	331
	332	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	333	goto valid;
	334
	335	mutex_lock(&vnode->validate_lock);
	336
	337	/* if the promise has expired, we need to check the server again to get
	338	* a new promise - note that if the (parent) directory's metadata was
	339	* changed then the security may be different and we may no longer have
	340	* access */
	341	if (!vnode->cb_promised \|\|
	342	test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
	343	_debug("not promised");
	344	ret = afs_vnode_fetch_status(vnode, NULL, key);
	345	if (ret < 0)
	346	goto error_unlock;
	347	_debug("new promise [fl=%lx]", vnode->flags);
	348	}
	349
	350	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	351	_debug("file already deleted");
	352	ret = -ESTALE;
	353	goto error_unlock;
	354	}
	355
	356	/* if the vnode's data version number changed then its contents are
	357	* different */
416351f2 DH	358	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	359	afs_zap_data(vnode);
260a9803 DH	360
	361	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	362	mutex_unlock(&vnode->validate_lock);
	363	valid:
	364	_leave(" = 0");
	365	return 0;
	366
	367	error_unlock:
	368	mutex_unlock(&vnode->validate_lock);
	369	_leave(" = %d", ret);
	370	return ret;
	371	}
	372
1da177e4 LT	373	/*
	374	* read the attributes of an inode
	375	*/
416351f2	376	int afs_getattr(struct vfsmount mnt, struct dentry dentry,
1da177e4 LT	377	struct kstat *stat)
1da177e4 LT	378	{
1da177e4	379	struct inode *inode;
1da177e4 LT	380
	381	inode = dentry->d_inode;
	382
7a224228 JNC	383	_enter("{ ino=%lu v=%llu }", inode->i_ino,
7a224228 JNC	384	(unsigned long long)inode->i_version);
1da177e4	385
1da177e4	386	generic_fillattr(inode, stat);
1da177e4	387	return 0;
ec26815a	388	}
1da177e4	389
bec5eb61	390	/*
	391	* discard an AFS inode
	392	*/
	393	int afs_drop_inode(struct inode *inode)
	394	{
	395	_enter("");
	396
	397	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	398	return generic_delete_inode(inode);
	399	else
	400	return generic_drop_inode(inode);
	401	}
	402
1da177e4 LT	403	/*
	404	* clear an AFS inode
	405	*/
b57922d9	406	void afs_evict_inode(struct inode *inode)
1da177e4	407	{
00d3b7a4	408	struct afs_permits *permits;
1da177e4 LT	409	struct afs_vnode *vnode;
	410
	411	vnode = AFS_FS_I(inode);
	412
416351f2	413	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
260a9803	414	vnode->fid.vid,
1da177e4	415	vnode->fid.vnode,
260a9803	416	vnode->fid.unique,
1da177e4 LT	417	vnode->cb_version,
1da177e4 LT	418	vnode->cb_expiry,
08e0e7c8	419	vnode->cb_type);
1da177e4	420
08e0e7c8 DH	421	_debug("CLEAR INODE %p", inode);
	422
	423	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	424
b57922d9 AV	425	truncate_inode_pages(&inode->i_data, 0);
	426	end_writeback(inode);
	427
08e0e7c8 DH	428	afs_give_up_callback(vnode);
	429
	430	if (vnode->server) {
	431	spin_lock(&vnode->server->fs_lock);
	432	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	433	spin_unlock(&vnode->server->fs_lock);
	434	afs_put_server(vnode->server);
	435	vnode->server = NULL;
	436	}
1da177e4	437
31143d5d	438	ASSERT(list_empty(&vnode->writebacks));
08e0e7c8	439	ASSERT(!vnode->cb_promised);
1da177e4	440
9b3f26c9 DH	441	#ifdef CONFIG_AFS_FSCACHE
9b3f26c9 DH	442	fscache_relinquish_cookie(vnode->cache, 0);
1da177e4 LT	443	vnode->cache = NULL;
	444	#endif
	445
00d3b7a4 DH	446	mutex_lock(&vnode->permits_lock);
	447	permits = vnode->permits;
	448	rcu_assign_pointer(vnode->permits, NULL);
	449	mutex_unlock(&vnode->permits_lock);
	450	if (permits)
	451	call_rcu(&permits->rcu, afs_zap_permits);
	452
1da177e4	453	_leave("");
ec26815a	454	}
31143d5d DH	455
	456	/*
	457	* set the attributes of an inode
	458	*/
	459	int afs_setattr(struct dentry dentry, struct iattr attr)
	460	{
	461	struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
	462	struct key *key;
	463	int ret;
	464
	465	_enter("{%x:%u},{n=%s},%x",
	466	vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
	467	attr->ia_valid);
	468
	469	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	470	ATTR_MTIME))) {
	471	_leave(" = 0 [unsupported]");
	472	return 0;
	473	}
	474
	475	/* flush any dirty data outstanding on a regular file */
	476	if (S_ISREG(vnode->vfs_inode.i_mode)) {
	477	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
	478	afs_writeback_all(vnode);
	479	}
	480
	481	if (attr->ia_valid & ATTR_FILE) {
	482	key = attr->ia_file->private_data;
	483	} else {
	484	key = afs_request_key(vnode->volume->cell);
	485	if (IS_ERR(key)) {
	486	ret = PTR_ERR(key);
	487	goto error;
	488	}
	489	}
	490
	491	ret = afs_vnode_setattr(vnode, key, attr);
	492	if (!(attr->ia_valid & ATTR_FILE))
	493	key_put(key);
	494
	495	error:
	496	_leave(" = %d", ret);
	497	return ret;
	498	}