[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 */
};

static const struct inode_operations afs_symlink_inode_operations = {
	.get_link	= page_get_link,
	.listxattr	= afs_listxattr,
};

/*
 * 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:
		/* Symlinks with a mode of 0644 are actually mountpoints. */
		if ((vnode->status.mode & 0777) == 0644) {
			inode->i_flags |= S_AUTOMOUNT;

			spin_lock(&vnode->lock);
			set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
			spin_unlock(&vnode->lock);

			inode->i_mode	= S_IFDIR | 0555;
			inode->i_op	= &afs_mntpt_inode_operations;
			inode->i_fop	= &afs_mntpt_file_operations;
		} else {
			inode->i_mode	= S_IFLNK | vnode->status.mode;
			inode->i_op	= &afs_symlink_inode_operations;
		}
		inode_nohighmem(inode);
		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

	set_nlink(inode, vnode->status.nlink);
	inode->i_uid		= vnode->status.owner;
	inode->i_gid            = vnode->status.group;
	inode->i_size		= vnode->status.size;
	inode->i_ctime.tv_sec	= vnode->status.mtime_client;
	inode->i_ctime.tv_nsec	= 0;
	inode->i_atime		= inode->i_mtime = inode->i_ctime;
	inode->i_blocks		= 0;
	inode->i_generation	= vnode->fid.unique;
	inode->i_version	= vnode->status.data_version;
	inode->i_mapping->a_ops	= &afs_fs_aops;
	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_generation == 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_generation = 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;
	set_nlink(inode, 2);
	inode->i_uid		= GLOBAL_ROOT_UID;
	inode->i_gid		= GLOBAL_ROOT_GID;
	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 = ktime_get_real_seconds();
		} else {
			vnode->cb_version = cb->version;
			vnode->cb_expiry = cb->expiry;
			vnode->cb_type = cb->type;
			vnode->cb_expires = vnode->cb_expiry +
				ktime_get_real_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, true);
#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 < ktime_get_real_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(const struct path *path, struct kstat *stat,
		u32 request_mask, unsigned int query_flags)
{
	struct inode *inode = d_inode(path->dentry);

	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);

	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_final(&inode->i_data);
	clear_inode(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_INIT_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(d_inode(dentry));
	struct key *key;
	int ret;

	_enter("{%x:%u},{n=%pd},%x",
	       vnode->fid.vid, vnode->fid.vnode, dentry,
	       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
	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@infradead.org>
	12	* David Howells <dhowells@redhat.com>
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/fs.h>
	20	#include <linux/pagemap.h>
	21	#include <linux/sched.h>
	22	#include <linux/mount.h>
	23	#include <linux/namei.h>
	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
	31	static const struct inode_operations afs_symlink_inode_operations = {
	32	.get_link = page_get_link,
	33	.listxattr = afs_listxattr,
	34	};
	35
	36	/*
	37	* map the AFS file status to the inode member variables
	38	*/
	39	static int afs_inode_map_status(struct afs_vnode vnode, struct key key)
	40	{
	41	struct inode *inode = AFS_VNODE_TO_I(vnode);
	42
	43	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
	44	vnode->status.type,
	45	vnode->status.nlink,
	46	(unsigned long long) vnode->status.size,
	47	vnode->status.data_version,
	48	vnode->status.mode);
	49
	50	switch (vnode->status.type) {
	51	case AFS_FTYPE_FILE:
	52	inode->i_mode = S_IFREG \| vnode->status.mode;
	53	inode->i_op = &afs_file_inode_operations;
	54	inode->i_fop = &afs_file_operations;
	55	break;
	56	case AFS_FTYPE_DIR:
	57	inode->i_mode = S_IFDIR \| vnode->status.mode;
	58	inode->i_op = &afs_dir_inode_operations;
	59	inode->i_fop = &afs_dir_file_operations;
	60	break;
	61	case AFS_FTYPE_SYMLINK:
	62	/* Symlinks with a mode of 0644 are actually mountpoints. */
	63	if ((vnode->status.mode & 0777) == 0644) {
	64	inode->i_flags \|= S_AUTOMOUNT;
	65
	66	spin_lock(&vnode->lock);
	67	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	68	spin_unlock(&vnode->lock);
	69
	70	inode->i_mode = S_IFDIR \| 0555;
	71	inode->i_op = &afs_mntpt_inode_operations;
	72	inode->i_fop = &afs_mntpt_file_operations;
	73	} else {
	74	inode->i_mode = S_IFLNK \| vnode->status.mode;
	75	inode->i_op = &afs_symlink_inode_operations;
	76	}
	77	inode_nohighmem(inode);
	78	break;
	79	default:
	80	printk("kAFS: AFS vnode with undefined type\n");
	81	return -EBADMSG;
	82	}
	83
	84	#ifdef CONFIG_AFS_FSCACHE
	85	if (vnode->status.size != inode->i_size)
	86	fscache_attr_changed(vnode->cache);
	87	#endif
	88
	89	set_nlink(inode, vnode->status.nlink);
	90	inode->i_uid = vnode->status.owner;
	91	inode->i_gid = vnode->status.group;
	92	inode->i_size = vnode->status.size;
	93	inode->i_ctime.tv_sec = vnode->status.mtime_client;
	94	inode->i_ctime.tv_nsec = 0;
	95	inode->i_atime = inode->i_mtime = inode->i_ctime;
	96	inode->i_blocks = 0;
	97	inode->i_generation = vnode->fid.unique;
	98	inode->i_version = vnode->status.data_version;
	99	inode->i_mapping->a_ops = &afs_fs_aops;
	100	return 0;
	101	}
	102
	103	/*
	104	* iget5() comparator
	105	*/
	106	static int afs_iget5_test(struct inode inode, void opaque)
	107	{
	108	struct afs_iget_data *data = opaque;
	109
	110	return inode->i_ino == data->fid.vnode &&
	111	inode->i_generation == data->fid.unique;
	112	}
	113
	114	/*
	115	* iget5() comparator for inode created by autocell operations
	116	*
	117	* These pseudo inodes don't match anything.
	118	*/
	119	static int afs_iget5_autocell_test(struct inode inode, void opaque)
	120	{
	121	return 0;
	122	}
	123
	124	/*
	125	* iget5() inode initialiser
	126	*/
	127	static int afs_iget5_set(struct inode inode, void opaque)
	128	{
	129	struct afs_iget_data *data = opaque;
	130	struct afs_vnode *vnode = AFS_FS_I(inode);
	131
	132	inode->i_ino = data->fid.vnode;
	133	inode->i_generation = data->fid.unique;
	134	vnode->fid = data->fid;
	135	vnode->volume = data->volume;
	136
	137	return 0;
	138	}
	139
	140	/*
	141	* inode retrieval for autocell
	142	*/
	143	struct inode afs_iget_autocell(struct inode dir, const char *dev_name,
	144	int namesz, struct key *key)
	145	{
	146	struct afs_iget_data data;
	147	struct afs_super_info *as;
	148	struct afs_vnode *vnode;
	149	struct super_block *sb;
	150	struct inode *inode;
	151	static atomic_t afs_autocell_ino;
	152
	153	_enter("{%x:%u},%.s,",
	154	AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
	155	namesz, namesz, dev_name ?: "");
	156
	157	sb = dir->i_sb;
	158	as = sb->s_fs_info;
	159	data.volume = as->volume;
	160	data.fid.vid = as->volume->vid;
	161	data.fid.unique = 0;
	162	data.fid.vnode = 0;
	163
	164	inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
	165	afs_iget5_autocell_test, afs_iget5_set,
	166	&data);
	167	if (!inode) {
	168	_leave(" = -ENOMEM");
	169	return ERR_PTR(-ENOMEM);
	170	}
	171
	172	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
	173	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	174	data.fid.unique);
	175
	176	vnode = AFS_FS_I(inode);
	177
	178	/* there shouldn't be an existing inode */
	179	BUG_ON(!(inode->i_state & I_NEW));
	180
	181	inode->i_size = 0;
	182	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
	183	inode->i_op = &afs_autocell_inode_operations;
	184	set_nlink(inode, 2);
	185	inode->i_uid = GLOBAL_ROOT_UID;
	186	inode->i_gid = GLOBAL_ROOT_GID;
	187	inode->i_ctime.tv_sec = get_seconds();
	188	inode->i_ctime.tv_nsec = 0;
	189	inode->i_atime = inode->i_mtime = inode->i_ctime;
	190	inode->i_blocks = 0;
	191	inode->i_version = 0;
	192	inode->i_generation = 0;
	193
	194	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
	195	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	196	inode->i_flags \|= S_AUTOMOUNT \| S_NOATIME;
	197	unlock_new_inode(inode);
	198	_leave(" = %p", inode);
	199	return inode;
	200	}
	201
	202	/*
	203	* inode retrieval
	204	*/
	205	struct inode afs_iget(struct super_block sb, struct key *key,
	206	struct afs_fid fid, struct afs_file_status status,
	207	struct afs_callback *cb)
	208	{
	209	struct afs_iget_data data = { .fid = *fid };
	210	struct afs_super_info *as;
	211	struct afs_vnode *vnode;
	212	struct inode *inode;
	213	int ret;
	214
	215	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
	216
	217	as = sb->s_fs_info;
	218	data.volume = as->volume;
	219
	220	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	221	&data);
	222	if (!inode) {
	223	_leave(" = -ENOMEM");
	224	return ERR_PTR(-ENOMEM);
	225	}
	226
	227	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	228	inode, fid->vid, fid->vnode, fid->unique);
	229
	230	vnode = AFS_FS_I(inode);
	231
	232	/* deal with an existing inode */
	233	if (!(inode->i_state & I_NEW)) {
	234	_leave(" = %p", inode);
	235	return inode;
	236	}
	237
	238	if (!status) {
	239	/* it's a remotely extant inode */
	240	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	241	ret = afs_vnode_fetch_status(vnode, NULL, key);
	242	if (ret < 0)
	243	goto bad_inode;
	244	} else {
	245	/* it's an inode we just created */
	246	memcpy(&vnode->status, status, sizeof(vnode->status));
	247
	248	if (!cb) {
	249	/* it's a symlink we just created (the fileserver
	250	* didn't give us a callback) */
	251	vnode->cb_version = 0;
	252	vnode->cb_expiry = 0;
	253	vnode->cb_type = 0;
	254	vnode->cb_expires = ktime_get_real_seconds();
	255	} else {
	256	vnode->cb_version = cb->version;
	257	vnode->cb_expiry = cb->expiry;
	258	vnode->cb_type = cb->type;
	259	vnode->cb_expires = vnode->cb_expiry +
	260	ktime_get_real_seconds();
	261	}
	262	}
	263
	264	/* set up caching before mapping the status, as map-status reads the
	265	* first page of symlinks to see if they're really mountpoints */
	266	inode->i_size = vnode->status.size;
	267	#ifdef CONFIG_AFS_FSCACHE
	268	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	269	&afs_vnode_cache_index_def,
	270	vnode, true);
	271	#endif
	272
	273	ret = afs_inode_map_status(vnode, key);
	274	if (ret < 0)
	275	goto bad_inode;
	276
	277	/* success */
	278	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
	279	inode->i_flags \|= S_NOATIME;
	280	unlock_new_inode(inode);
	281	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
	282	return inode;
	283
	284	/* failure */
	285	bad_inode:
	286	#ifdef CONFIG_AFS_FSCACHE
	287	fscache_relinquish_cookie(vnode->cache, 0);
	288	vnode->cache = NULL;
	289	#endif
	290	iget_failed(inode);
	291	_leave(" = %d [bad]", ret);
	292	return ERR_PTR(ret);
	293	}
	294
	295	/*
	296	* mark the data attached to an inode as obsolete due to a write on the server
	297	* - might also want to ditch all the outstanding writes and dirty pages
	298	*/
	299	void afs_zap_data(struct afs_vnode *vnode)
	300	{
	301	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
	302
	303	/* nuke all the non-dirty pages that aren't locked, mapped or being
	304	* written back in a regular file and completely discard the pages in a
	305	* directory or symlink */
	306	if (S_ISREG(vnode->vfs_inode.i_mode))
	307	invalidate_remote_inode(&vnode->vfs_inode);
	308	else
	309	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
	310	}
	311
	312	/*
	313	* validate a vnode/inode
	314	* - there are several things we need to check
	315	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	316	* symlink)
	317	* - parent dir metadata changed (security changes)
	318	* - dentry data changed (write, truncate)
	319	* - dentry metadata changed (security changes)
	320	*/
	321	int afs_validate(struct afs_vnode vnode, struct key key)
	322	{
	323	int ret;
	324
	325	_enter("{v={%x:%u} fl=%lx},%x",
	326	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	327	key_serial(key));
	328
	329	if (vnode->cb_promised &&
	330	!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	331	!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	332	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
	333	if (vnode->cb_expires < ktime_get_real_seconds() + 10) {
	334	_debug("callback expired");
	335	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	336	} else {
	337	goto valid;
	338	}
	339	}
	340
	341	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	342	goto valid;
	343
	344	mutex_lock(&vnode->validate_lock);
	345
	346	/* if the promise has expired, we need to check the server again to get
	347	* a new promise - note that if the (parent) directory's metadata was
	348	* changed then the security may be different and we may no longer have
	349	* access */
	350	if (!vnode->cb_promised \|\|
	351	test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
	352	_debug("not promised");
	353	ret = afs_vnode_fetch_status(vnode, NULL, key);
	354	if (ret < 0)
	355	goto error_unlock;
	356	_debug("new promise [fl=%lx]", vnode->flags);
	357	}
	358
	359	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	360	_debug("file already deleted");
	361	ret = -ESTALE;
	362	goto error_unlock;
	363	}
	364
	365	/* if the vnode's data version number changed then its contents are
	366	* different */
	367	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
	368	afs_zap_data(vnode);
	369
	370	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	371	mutex_unlock(&vnode->validate_lock);
	372	valid:
	373	_leave(" = 0");
	374	return 0;
	375
	376	error_unlock:
	377	mutex_unlock(&vnode->validate_lock);
	378	_leave(" = %d", ret);
	379	return ret;
	380	}
	381
	382	/*
	383	* read the attributes of an inode
	384	*/
	385	int afs_getattr(const struct path path, struct kstat stat,
	386	u32 request_mask, unsigned int query_flags)
	387	{
	388	struct inode *inode = d_inode(path->dentry);
	389
	390	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
	391
	392	generic_fillattr(inode, stat);
	393	return 0;
	394	}
	395
	396	/*
	397	* discard an AFS inode
	398	*/
	399	int afs_drop_inode(struct inode *inode)
	400	{
	401	_enter("");
	402
	403	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	404	return generic_delete_inode(inode);
	405	else
	406	return generic_drop_inode(inode);
	407	}
	408
	409	/*
	410	* clear an AFS inode
	411	*/
	412	void afs_evict_inode(struct inode *inode)
	413	{
	414	struct afs_permits *permits;
	415	struct afs_vnode *vnode;
	416
	417	vnode = AFS_FS_I(inode);
	418
	419	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
	420	vnode->fid.vid,
	421	vnode->fid.vnode,
	422	vnode->fid.unique,
	423	vnode->cb_version,
	424	vnode->cb_expiry,
	425	vnode->cb_type);
	426
	427	_debug("CLEAR INODE %p", inode);
	428
	429	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	430
	431	truncate_inode_pages_final(&inode->i_data);
	432	clear_inode(inode);
	433
	434	afs_give_up_callback(vnode);
	435
	436	if (vnode->server) {
	437	spin_lock(&vnode->server->fs_lock);
	438	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	439	spin_unlock(&vnode->server->fs_lock);
	440	afs_put_server(vnode->server);
	441	vnode->server = NULL;
	442	}
	443
	444	ASSERT(list_empty(&vnode->writebacks));
	445	ASSERT(!vnode->cb_promised);
	446
	447	#ifdef CONFIG_AFS_FSCACHE
	448	fscache_relinquish_cookie(vnode->cache, 0);
	449	vnode->cache = NULL;
	450	#endif
	451
	452	mutex_lock(&vnode->permits_lock);
	453	permits = vnode->permits;
	454	RCU_INIT_POINTER(vnode->permits, NULL);
	455	mutex_unlock(&vnode->permits_lock);
	456	if (permits)
	457	call_rcu(&permits->rcu, afs_zap_permits);
	458
	459	_leave("");
	460	}
	461
	462	/*
	463	* set the attributes of an inode
	464	*/
	465	int afs_setattr(struct dentry dentry, struct iattr attr)
	466	{
	467	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
	468	struct key *key;
	469	int ret;
	470
	471	_enter("{%x:%u},{n=%pd},%x",
	472	vnode->fid.vid, vnode->fid.vnode, dentry,
	473	attr->ia_valid);
	474
	475	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	476	ATTR_MTIME))) {
	477	_leave(" = 0 [unsupported]");
	478	return 0;
	479	}
	480
	481	/* flush any dirty data outstanding on a regular file */
	482	if (S_ISREG(vnode->vfs_inode.i_mode)) {
	483	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
	484	afs_writeback_all(vnode);
	485	}
	486
	487	if (attr->ia_valid & ATTR_FILE) {
	488	key = attr->ia_file->private_data;
	489	} else {
	490	key = afs_request_key(vnode->volume->cell);
	491	if (IS_ERR(key)) {
	492	ret = PTR_ERR(key);
	493	goto error;
	494	}
	495	}
	496
	497	ret = afs_vnode_setattr(vnode, key, attr);
	498	if (!(attr->ia_valid & ATTR_FILE))
	499	key_put(key);
	500
	501	error:
	502	_leave(" = %d", ret);
	503	return ret;
	504	}