[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:
		/* 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	= &page_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
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:
944c74f4 DH	57	/* Symlinks with a mode of 0644 are actually mountpoints. */
	58	if ((vnode->status.mode & 0777) == 0644) {
	59	inode->i_flags \|= S_AUTOMOUNT;
	60
	61	spin_lock(&vnode->lock);
	62	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	63	spin_unlock(&vnode->lock);
	64
	65	inode->i_mode = S_IFDIR \| 0555;
	66	inode->i_op = &afs_mntpt_inode_operations;
	67	inode->i_fop = &afs_mntpt_file_operations;
	68	} else {
	69	inode->i_mode = S_IFLNK \| vnode->status.mode;
	70	inode->i_op = &page_symlink_inode_operations;
	71	}
21fc61c7	72	inode_nohighmem(inode);
1da177e4 LT	73	break;
	74	default:
	75	printk("kAFS: AFS vnode with undefined type\n");
	76	return -EBADMSG;
	77	}
	78
9b3f26c9 DH	79	#ifdef CONFIG_AFS_FSCACHE
	80	if (vnode->status.size != inode->i_size)
	81	fscache_attr_changed(vnode->cache);
	82	#endif
	83
bfe86848	84	set_nlink(inode, vnode->status.nlink);
1da177e4	85	inode->i_uid = vnode->status.owner;
6186f078	86	inode->i_gid = vnode->status.group;
1da177e4	87	inode->i_size = vnode->status.size;
ab94f5d0	88	inode->i_ctime.tv_sec = vnode->status.mtime_client;
1da177e4 LT	89	inode->i_ctime.tv_nsec = 0;
1da177e4 LT	90	inode->i_atime = inode->i_mtime = inode->i_ctime;
1da177e4	91	inode->i_blocks = 0;
d6e43f75 DH	92	inode->i_generation = vnode->fid.unique;
d6e43f75 DH	93	inode->i_version = vnode->status.data_version;
1da177e4	94	inode->i_mapping->a_ops = &afs_fs_aops;
1da177e4	95	return 0;
ec26815a	96	}
1da177e4	97
1da177e4 LT	98	/*
	99	* iget5() comparator
	100	*/
	101	static int afs_iget5_test(struct inode inode, void opaque)
	102	{
	103	struct afs_iget_data *data = opaque;
	104
	105	return inode->i_ino == data->fid.vnode &&
d6e43f75	106	inode->i_generation == data->fid.unique;
ec26815a	107	}
1da177e4	108
bec5eb61	109	/*
	110	* iget5() comparator for inode created by autocell operations
	111	*
	112	* These pseudo inodes don't match anything.
	113	*/
	114	static int afs_iget5_autocell_test(struct inode inode, void opaque)
	115	{
	116	return 0;
	117	}
	118
1da177e4 LT	119	/*
	120	* iget5() inode initialiser
	121	*/
	122	static int afs_iget5_set(struct inode inode, void opaque)
	123	{
	124	struct afs_iget_data *data = opaque;
	125	struct afs_vnode *vnode = AFS_FS_I(inode);
	126
	127	inode->i_ino = data->fid.vnode;
d6e43f75	128	inode->i_generation = data->fid.unique;
1da177e4 LT	129	vnode->fid = data->fid;
	130	vnode->volume = data->volume;
	131
	132	return 0;
ec26815a	133	}
1da177e4	134
bec5eb61	135	/*
	136	* inode retrieval for autocell
	137	*/
	138	struct inode afs_iget_autocell(struct inode dir, const char *dev_name,
	139	int namesz, struct key *key)
	140	{
	141	struct afs_iget_data data;
	142	struct afs_super_info *as;
	143	struct afs_vnode *vnode;
	144	struct super_block *sb;
	145	struct inode *inode;
	146	static atomic_t afs_autocell_ino;
	147
	148	_enter("{%x:%u},%.s,",
	149	AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
	150	namesz, namesz, dev_name ?: "");
	151
	152	sb = dir->i_sb;
	153	as = sb->s_fs_info;
	154	data.volume = as->volume;
	155	data.fid.vid = as->volume->vid;
	156	data.fid.unique = 0;
	157	data.fid.vnode = 0;
	158
	159	inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
	160	afs_iget5_autocell_test, afs_iget5_set,
	161	&data);
	162	if (!inode) {
	163	_leave(" = -ENOMEM");
	164	return ERR_PTR(-ENOMEM);
	165	}
	166
	167	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
	168	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	169	data.fid.unique);
	170
	171	vnode = AFS_FS_I(inode);
	172
	173	/* there shouldn't be an existing inode */
	174	BUG_ON(!(inode->i_state & I_NEW));
	175
	176	inode->i_size = 0;
	177	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
	178	inode->i_op = &afs_autocell_inode_operations;
bfe86848	179	set_nlink(inode, 2);
a0a5386a EB	180	inode->i_uid = GLOBAL_ROOT_UID;
a0a5386a EB	181	inode->i_gid = GLOBAL_ROOT_GID;
bec5eb61	182	inode->i_ctime.tv_sec = get_seconds();
	183	inode->i_ctime.tv_nsec = 0;
	184	inode->i_atime = inode->i_mtime = inode->i_ctime;
	185	inode->i_blocks = 0;
	186	inode->i_version = 0;
	187	inode->i_generation = 0;
	188
	189	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
d18610b0 DH	190	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
d18610b0 DH	191	inode->i_flags \|= S_AUTOMOUNT \| S_NOATIME;
bec5eb61	192	unlock_new_inode(inode);
	193	_leave(" = %p", inode);
	194	return inode;
	195	}
	196
1da177e4 LT	197	/*
	198	* inode retrieval
	199	*/
260a9803 DH	200	struct inode afs_iget(struct super_block sb, struct key *key,
	201	struct afs_fid fid, struct afs_file_status status,
	202	struct afs_callback *cb)
1da177e4 LT	203	{
	204	struct afs_iget_data data = { .fid = *fid };
	205	struct afs_super_info *as;
	206	struct afs_vnode *vnode;
	207	struct inode *inode;
	208	int ret;
	209
416351f2	210	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	211
	212	as = sb->s_fs_info;
	213	data.volume = as->volume;
	214
	215	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	216	&data);
	217	if (!inode) {
	218	_leave(" = -ENOMEM");
08e0e7c8	219	return ERR_PTR(-ENOMEM);
1da177e4 LT	220	}
1da177e4 LT	221
08e0e7c8 DH	222	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	223	inode, fid->vid, fid->vnode, fid->unique);
	224
1da177e4 LT	225	vnode = AFS_FS_I(inode);
	226
	227	/* deal with an existing inode */
	228	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	229	_leave(" = %p", inode);
08e0e7c8 DH	230	return inode;
1da177e4 LT	231	}
1da177e4 LT	232
260a9803 DH	233	if (!status) {
	234	/* it's a remotely extant inode */
	235	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	236	ret = afs_vnode_fetch_status(vnode, NULL, key);
	237	if (ret < 0)
	238	goto bad_inode;
	239	} else {
	240	/* it's an inode we just created */
	241	memcpy(&vnode->status, status, sizeof(vnode->status));
	242
	243	if (!cb) {
	244	/* it's a symlink we just created (the fileserver
	245	* didn't give us a callback) */
	246	vnode->cb_version = 0;
	247	vnode->cb_expiry = 0;
	248	vnode->cb_type = 0;
56e71431	249	vnode->cb_expires = ktime_get_real_seconds();
260a9803 DH	250	} else {
	251	vnode->cb_version = cb->version;
	252	vnode->cb_expiry = cb->expiry;
	253	vnode->cb_type = cb->type;
56e71431 TR	254	vnode->cb_expires = vnode->cb_expiry +
56e71431 TR	255	ktime_get_real_seconds();
260a9803 DH	256	}
	257	}
	258
9b3f26c9 DH	259	/* set up caching before mapping the status, as map-status reads the
	260	* first page of symlinks to see if they're really mountpoints */
	261	inode->i_size = vnode->status.size;
	262	#ifdef CONFIG_AFS_FSCACHE
	263	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	264	&afs_vnode_cache_index_def,
94d30ae9	265	vnode, true);
9b3f26c9 DH	266	#endif
9b3f26c9 DH	267
00d3b7a4	268	ret = afs_inode_map_status(vnode, key);
08e0e7c8	269	if (ret < 0)
1da177e4 LT	270	goto bad_inode;
	271
	272	/* success */
260a9803	273	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	274	inode->i_flags \|= S_NOATIME;
1da177e4	275	unlock_new_inode(inode);
08e0e7c8 DH	276	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	277	return inode;
1da177e4 LT	278
1da177e4 LT	279	/* failure */
ec26815a	280	bad_inode:
9b3f26c9 DH	281	#ifdef CONFIG_AFS_FSCACHE
	282	fscache_relinquish_cookie(vnode->cache, 0);
	283	vnode->cache = NULL;
	284	#endif
aa7fa240	285	iget_failed(inode);
1da177e4	286	_leave(" = %d [bad]", ret);
08e0e7c8	287	return ERR_PTR(ret);
ec26815a	288	}
1da177e4	289
416351f2 DH	290	/*
	291	* mark the data attached to an inode as obsolete due to a write on the server
	292	* - might also want to ditch all the outstanding writes and dirty pages
	293	*/
	294	void afs_zap_data(struct afs_vnode *vnode)
	295	{
0f300ca9	296	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2 DH	297
416351f2 DH	298	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	299	* written back in a regular file and completely discard the pages in a
	300	* directory or symlink */
	301	if (S_ISREG(vnode->vfs_inode.i_mode))
	302	invalidate_remote_inode(&vnode->vfs_inode);
	303	else
	304	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	305	}
416351f2 DH	306
260a9803 DH	307	/*
	308	* validate a vnode/inode
	309	* - there are several things we need to check
	310	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	311	* symlink)
	312	* - parent dir metadata changed (security changes)
	313	* - dentry data changed (write, truncate)
	314	* - dentry metadata changed (security changes)
	315	*/
	316	int afs_validate(struct afs_vnode vnode, struct key key)
	317	{
	318	int ret;
	319
	320	_enter("{v={%x:%u} fl=%lx},%x",
	321	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	322	key_serial(key));
	323
	324	if (vnode->cb_promised &&
	325	!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
	326	!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
	327	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
56e71431	328	if (vnode->cb_expires < ktime_get_real_seconds() + 10) {
260a9803 DH	329	_debug("callback expired");
	330	set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
	331	} else {
	332	goto valid;
	333	}
	334	}
	335
	336	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	337	goto valid;
	338
	339	mutex_lock(&vnode->validate_lock);
	340
	341	/* if the promise has expired, we need to check the server again to get
	342	* a new promise - note that if the (parent) directory's metadata was
	343	* changed then the security may be different and we may no longer have
	344	* access */
	345	if (!vnode->cb_promised \|\|
	346	test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
	347	_debug("not promised");
	348	ret = afs_vnode_fetch_status(vnode, NULL, key);
	349	if (ret < 0)
	350	goto error_unlock;
	351	_debug("new promise [fl=%lx]", vnode->flags);
	352	}
	353
	354	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	355	_debug("file already deleted");
	356	ret = -ESTALE;
	357	goto error_unlock;
	358	}
	359
	360	/* if the vnode's data version number changed then its contents are
	361	* different */
416351f2 DH	362	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	363	afs_zap_data(vnode);
260a9803 DH	364
	365	clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
	366	mutex_unlock(&vnode->validate_lock);
	367	valid:
	368	_leave(" = 0");
	369	return 0;
	370
	371	error_unlock:
	372	mutex_unlock(&vnode->validate_lock);
	373	_leave(" = %d", ret);
	374	return ret;
	375	}
	376
1da177e4 LT	377	/*
	378	* read the attributes of an inode
	379	*/
a528d35e DH	380	int afs_getattr(const struct path path, struct kstat stat,
a528d35e DH	381	u32 request_mask, unsigned int query_flags)
1da177e4	382	{
a528d35e	383	struct inode *inode = d_inode(path->dentry);
1da177e4	384
d6e43f75	385	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
1da177e4	386
1da177e4	387	generic_fillattr(inode, stat);
1da177e4	388	return 0;
ec26815a	389	}
1da177e4	390
bec5eb61	391	/*
	392	* discard an AFS inode
	393	*/
	394	int afs_drop_inode(struct inode *inode)
	395	{
	396	_enter("");
	397
	398	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	399	return generic_delete_inode(inode);
	400	else
	401	return generic_drop_inode(inode);
	402	}
	403
1da177e4 LT	404	/*
	405	* clear an AFS inode
	406	*/
b57922d9	407	void afs_evict_inode(struct inode *inode)
1da177e4	408	{
00d3b7a4	409	struct afs_permits *permits;
1da177e4 LT	410	struct afs_vnode *vnode;
	411
	412	vnode = AFS_FS_I(inode);
	413
416351f2	414	_enter("{%x:%u.%d} v=%u x=%u t=%u }",
260a9803	415	vnode->fid.vid,
1da177e4	416	vnode->fid.vnode,
260a9803	417	vnode->fid.unique,
1da177e4 LT	418	vnode->cb_version,
1da177e4 LT	419	vnode->cb_expiry,
08e0e7c8	420	vnode->cb_type);
1da177e4	421
08e0e7c8 DH	422	_debug("CLEAR INODE %p", inode);
	423
	424	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	425
91b0abe3	426	truncate_inode_pages_final(&inode->i_data);
dbd5768f	427	clear_inode(inode);
b57922d9	428
08e0e7c8 DH	429	afs_give_up_callback(vnode);
	430
	431	if (vnode->server) {
	432	spin_lock(&vnode->server->fs_lock);
	433	rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
	434	spin_unlock(&vnode->server->fs_lock);
	435	afs_put_server(vnode->server);
	436	vnode->server = NULL;
	437	}
1da177e4	438
31143d5d	439	ASSERT(list_empty(&vnode->writebacks));
08e0e7c8	440	ASSERT(!vnode->cb_promised);
1da177e4	441
9b3f26c9 DH	442	#ifdef CONFIG_AFS_FSCACHE
9b3f26c9 DH	443	fscache_relinquish_cookie(vnode->cache, 0);
1da177e4 LT	444	vnode->cache = NULL;
	445	#endif
	446
00d3b7a4 DH	447	mutex_lock(&vnode->permits_lock);
00d3b7a4 DH	448	permits = vnode->permits;
1d7e4ebf	449	RCU_INIT_POINTER(vnode->permits, NULL);
00d3b7a4 DH	450	mutex_unlock(&vnode->permits_lock);
	451	if (permits)
	452	call_rcu(&permits->rcu, afs_zap_permits);
	453
1da177e4	454	_leave("");
ec26815a	455	}
31143d5d DH	456
	457	/*
	458	* set the attributes of an inode
	459	*/
	460	int afs_setattr(struct dentry dentry, struct iattr attr)
	461	{
2b0143b5	462	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
31143d5d DH	463	struct key *key;
	464	int ret;
	465
a455589f AV	466	_enter("{%x:%u},{n=%pd},%x",
a455589f AV	467	vnode->fid.vid, vnode->fid.vnode, dentry,
31143d5d DH	468	attr->ia_valid);
	469
	470	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	471	ATTR_MTIME))) {
	472	_leave(" = 0 [unsupported]");
	473	return 0;
	474	}
	475
	476	/* flush any dirty data outstanding on a regular file */
	477	if (S_ISREG(vnode->vfs_inode.i_mode)) {
	478	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
	479	afs_writeback_all(vnode);
	480	}
	481
	482	if (attr->ia_valid & ATTR_FILE) {
	483	key = attr->ia_file->private_data;
	484	} else {
	485	key = afs_request_key(vnode->volume->cell);
	486	if (IS_ERR(key)) {
	487	ret = PTR_ERR(key);
	488	goto error;
	489	}
	490	}
	491
	492	ret = afs_vnode_setattr(vnode, key, attr);
	493	if (!(attr->ia_valid & ATTR_FILE))
	494	key_put(key);
	495
	496	error:
	497	_leave(" = %d", ret);
	498	return ret;
	499	}