[linux-2.6-block.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 <linux/iversion.h>
#include "internal.h"

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

/*
 * Initialise an inode from the vnode status.
 */
static int afs_inode_init_from_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);

	read_seqlock_excl(&vnode->cb_lock);

	afs_update_inode_from_status(vnode, &vnode->status, NULL,
				     AFS_VNODE_NOT_YET_SET);

	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;
		inode->i_mapping->a_ops	= &afs_fs_aops;
		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;
		inode->i_mapping->a_ops	= &afs_dir_aops;
		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;

			set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);

			inode->i_mode	= S_IFDIR | 0555;
			inode->i_op	= &afs_mntpt_inode_operations;
			inode->i_fop	= &afs_mntpt_file_operations;
			inode->i_mapping->a_ops	= &afs_fs_aops;
		} else {
			inode->i_mode	= S_IFLNK | vnode->status.mode;
			inode->i_op	= &afs_symlink_inode_operations;
			inode->i_mapping->a_ops	= &afs_fs_aops;
		}
		inode_nohighmem(inode);
		break;
	default:
		printk("kAFS: AFS vnode with undefined type\n");
		read_sequnlock_excl(&vnode->cb_lock);
		return afs_protocol_error(NULL, -EBADMSG);
	}

	inode->i_blocks		= 0;
	vnode->invalid_before	= vnode->status.data_version;

	read_sequnlock_excl(&vnode->cb_lock);
	return 0;
}

/*
 * Fetch file status from the volume.
 */
int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
{
	struct afs_fs_cursor fc;
	int ret;

	_enter("%s,{%x:%u.%u,S=%lx}",
	       vnode->volume->name,
	       vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
	       vnode->flags);

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, vnode, key)) {
		while (afs_select_fileserver(&fc)) {
			fc.cb_break = vnode->cb_break + vnode->cb_s_break;
			afs_fs_fetch_file_status(&fc, NULL, new_inode);
		}

		afs_check_for_remote_deletion(&fc, fc.vnode);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
		ret = afs_end_vnode_operation(&fc);
	}

	_leave(" = %d", ret);
	return ret;
}

/*
 * iget5() comparator
 */
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_pseudo_dir_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;
}

/*
 * Create an inode for a dynamic root directory or an autocell dynamic
 * automount dir.
 */
struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
{
	struct afs_iget_data data;
	struct afs_super_info *as;
	struct afs_vnode *vnode;
	struct inode *inode;
	static atomic_t afs_autocell_ino;

	_enter("");

	as = sb->s_fs_info;
	if (as->volume) {
		data.volume = as->volume;
		data.fid.vid = as->volume->vid;
	}
	if (root) {
		data.fid.vnode = 1;
		data.fid.unique = 1;
	} else {
		data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
		data.fid.unique = 0;
	}

	inode = iget5_locked(sb, data.fid.vnode,
			     afs_iget5_pseudo_dir_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;
	if (root) {
		inode->i_op	= &afs_dynroot_inode_operations;
		inode->i_fop	= &afs_dynroot_file_operations;
	} else {
		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_set_iversion_raw(inode, 0);
	inode->i_generation	= 0;

	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
	if (!root) {
		set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
		inode->i_flags |= S_AUTOMOUNT;
	}

	inode->i_flags |= S_NOATIME;
	unlock_new_inode(inode);
	_leave(" = %p", inode);
	return inode;
}

/*
 * Get a cache cookie for an inode.
 */
static void afs_get_inode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
	struct {
		u32 vnode_id;
		u32 unique;
		u32 vnode_id_ext[2];	/* Allow for a 96-bit key */
	} __packed key;
	struct afs_vnode_cache_aux aux;

	if (vnode->status.type == AFS_FTYPE_DIR) {
		vnode->cache = NULL;
		return;
	}

	key.vnode_id		= vnode->fid.vnode;
	key.unique		= vnode->fid.unique;
	key.vnode_id_ext[0]	= 0;
	key.vnode_id_ext[1]	= 0;
	aux.data_version	= vnode->status.data_version;

	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
					      &afs_vnode_cache_index_def,
					      &key, sizeof(key),
					      &aux, sizeof(aux),
					      vnode, vnode->status.size, true);
#endif
}

/*
 * 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_cb_interest *cbi)
{
	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 */
		ret = afs_fetch_status(vnode, key, true);
		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_type = 0;
			vnode->cb_expires_at = 0;
		} else {
			vnode->cb_version = cb->version;
			vnode->cb_type = cb->type;
			vnode->cb_expires_at = cb->expiry;
			vnode->cb_interest = afs_get_cb_interest(cbi);
			set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
		}

		vnode->cb_expires_at += ktime_get_real_seconds();
	}

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

	afs_get_inode_cache(vnode);

	/* 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:
	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);

#ifdef CONFIG_AFS_FSCACHE
	fscache_invalidate(vnode->cache);
#endif

	/* 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)
{
	time64_t now = ktime_get_real_seconds();
	bool valid = false;
	int ret;

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

	/* Quickly check the callback state.  Ideally, we'd use read_seqbegin
	 * here, but we have no way to pass the net namespace to the RCU
	 * cleanup for the server record.
	 */
	read_seqlock_excl(&vnode->cb_lock);

	if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
		if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break) {
			vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
		} else if (vnode->status.type == AFS_FTYPE_DIR &&
			   test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
			   vnode->cb_expires_at - 10 > now) {
				valid = true;
		} else if (!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
			   vnode->cb_expires_at - 10 > now) {
				valid = true;
		}
	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
		valid = true;
	}

	read_sequnlock_excl(&vnode->cb_lock);

	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
		clear_nlink(&vnode->vfs_inode);

	if (valid)
		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 (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
		_debug("not promised");
		ret = afs_fetch_status(vnode, key, false);
		if (ret < 0) {
			if (ret == -ENOENT) {
				set_bit(AFS_VNODE_DELETED, &vnode->flags);
				ret = -ESTALE;
			}
			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);
	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);
	struct afs_vnode *vnode = AFS_FS_I(inode);
	int seq = 0;

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

	do {
		read_seqbegin_or_lock(&vnode->cb_lock, &seq);
		generic_fillattr(inode, stat);
	} while (need_seqretry(&vnode->cb_lock, seq));

	done_seqretry(&vnode->cb_lock, seq);
	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_vnode *vnode;

	vnode = AFS_FS_I(inode);

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

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

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

	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);

	if (vnode->cb_interest) {
		afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
		vnode->cb_interest = NULL;
	}

	while (!list_empty(&vnode->wb_keys)) {
		struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
						    struct afs_wb_key, vnode_link);
		list_del(&wbk->vnode_link);
		afs_put_wb_key(wbk);
	}

#ifdef CONFIG_AFS_FSCACHE
	{
		struct afs_vnode_cache_aux aux;

		aux.data_version = vnode->status.data_version;
		fscache_relinquish_cookie(vnode->cache, &aux,
					  test_bit(AFS_VNODE_DELETED, &vnode->flags));
		vnode->cache = NULL;
	}
#endif

	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
	_leave("");
}

/*
 * set the attributes of an inode
 */
int afs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct afs_fs_cursor fc;
	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);

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

	ret = -ERESTARTSYS;
	if (afs_begin_vnode_operation(&fc, vnode, key)) {
		while (afs_select_fileserver(&fc)) {
			fc.cb_break = vnode->cb_break + vnode->cb_s_break;
			afs_fs_setattr(&fc, attr);
		}

		afs_check_for_remote_deletion(&fc, fc.vnode);
		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
		ret = afs_end_vnode_operation(&fc);
	}

	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>
a01179e6	24	#include <linux/iversion.h>
1da177e4 LT	25	#include "internal.h"
1da177e4 LT	26
d3e3b7ea DH	27	static const struct inode_operations afs_symlink_inode_operations = {
	28	.get_link = page_get_link,
	29	.listxattr = afs_listxattr,
	30	};
	31
1da177e4	32	/*
dd9fbcb8	33	* Initialise an inode from the vnode status.
1da177e4	34	*/
dd9fbcb8	35	static int afs_inode_init_from_status(struct afs_vnode vnode, struct key key)
1da177e4 LT	36	{
	37	struct inode *inode = AFS_VNODE_TO_I(vnode);
	38
260a9803	39	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
1da177e4 LT	40	vnode->status.type,
1da177e4 LT	41	vnode->status.nlink,
ba3e0e1a	42	(unsigned long long) vnode->status.size,
08e0e7c8	43	vnode->status.data_version,
1da177e4 LT	44	vnode->status.mode);
1da177e4 LT	45
c435ee34 DH	46	read_seqlock_excl(&vnode->cb_lock);
c435ee34 DH	47
dd9fbcb8 DH	48	afs_update_inode_from_status(vnode, &vnode->status, NULL,
	49	AFS_VNODE_NOT_YET_SET);
	50
1da177e4 LT	51	switch (vnode->status.type) {
	52	case AFS_FTYPE_FILE:
	53	inode->i_mode = S_IFREG \| vnode->status.mode;
	54	inode->i_op = &afs_file_inode_operations;
00d3b7a4	55	inode->i_fop = &afs_file_operations;
f3ddee8d	56	inode->i_mapping->a_ops = &afs_fs_aops;
1da177e4 LT	57	break;
	58	case AFS_FTYPE_DIR:
	59	inode->i_mode = S_IFDIR \| vnode->status.mode;
	60	inode->i_op = &afs_dir_inode_operations;
	61	inode->i_fop = &afs_dir_file_operations;
f3ddee8d	62	inode->i_mapping->a_ops = &afs_dir_aops;
1da177e4 LT	63	break;
1da177e4 LT	64	case AFS_FTYPE_SYMLINK:
944c74f4 DH	65	/* Symlinks with a mode of 0644 are actually mountpoints. */
	66	if ((vnode->status.mode & 0777) == 0644) {
	67	inode->i_flags \|= S_AUTOMOUNT;
	68
944c74f4	69	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
944c74f4 DH	70
	71	inode->i_mode = S_IFDIR \| 0555;
	72	inode->i_op = &afs_mntpt_inode_operations;
	73	inode->i_fop = &afs_mntpt_file_operations;
f3ddee8d	74	inode->i_mapping->a_ops = &afs_fs_aops;
944c74f4 DH	75	} else {
944c74f4 DH	76	inode->i_mode = S_IFLNK \| vnode->status.mode;
d3e3b7ea	77	inode->i_op = &afs_symlink_inode_operations;
f3ddee8d	78	inode->i_mapping->a_ops = &afs_fs_aops;
944c74f4	79	}
21fc61c7	80	inode_nohighmem(inode);
1da177e4 LT	81	break;
	82	default:
	83	printk("kAFS: AFS vnode with undefined type\n");
c435ee34	84	read_sequnlock_excl(&vnode->cb_lock);
5f702c8e	85	return afs_protocol_error(NULL, -EBADMSG);
1da177e4 LT	86	}
1da177e4 LT	87
1da177e4	88	inode->i_blocks = 0;
a4ff7401	89	vnode->invalid_before = vnode->status.data_version;
c435ee34 DH	90
c435ee34 DH	91	read_sequnlock_excl(&vnode->cb_lock);
1da177e4	92	return 0;
ec26815a	93	}
1da177e4	94
d2ddc776 DH	95	/*
	96	* Fetch file status from the volume.
	97	*/
0c3a5ac2	98	int afs_fetch_status(struct afs_vnode vnode, struct key key, bool new_inode)
d2ddc776 DH	99	{
	100	struct afs_fs_cursor fc;
	101	int ret;
	102
	103	_enter("%s,{%x:%u.%u,S=%lx}",
	104	vnode->volume->name,
	105	vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
	106	vnode->flags);
	107
	108	ret = -ERESTARTSYS;
	109	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	110	while (afs_select_fileserver(&fc)) {
	111	fc.cb_break = vnode->cb_break + vnode->cb_s_break;
0c3a5ac2	112	afs_fs_fetch_file_status(&fc, NULL, new_inode);
d2ddc776 DH	113	}
	114
	115	afs_check_for_remote_deletion(&fc, fc.vnode);
	116	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	117	ret = afs_end_vnode_operation(&fc);
	118	}
	119
	120	_leave(" = %d", ret);
	121	return ret;
	122	}
	123
1da177e4 LT	124	/*
	125	* iget5() comparator
	126	*/
c435ee34	127	int afs_iget5_test(struct inode inode, void opaque)
1da177e4 LT	128	{
	129	struct afs_iget_data *data = opaque;
	130
	131	return inode->i_ino == data->fid.vnode &&
d6e43f75	132	inode->i_generation == data->fid.unique;
ec26815a	133	}
1da177e4	134
bec5eb61	135	/*
	136	* iget5() comparator for inode created by autocell operations
	137	*
	138	* These pseudo inodes don't match anything.
	139	*/
4d673da1	140	static int afs_iget5_pseudo_dir_test(struct inode inode, void opaque)
bec5eb61	141	{
	142	return 0;
	143	}
	144
1da177e4 LT	145	/*
	146	* iget5() inode initialiser
	147	*/
	148	static int afs_iget5_set(struct inode inode, void opaque)
	149	{
	150	struct afs_iget_data *data = opaque;
	151	struct afs_vnode *vnode = AFS_FS_I(inode);
	152
	153	inode->i_ino = data->fid.vnode;
d6e43f75	154	inode->i_generation = data->fid.unique;
1da177e4 LT	155	vnode->fid = data->fid;
	156	vnode->volume = data->volume;
	157
	158	return 0;
ec26815a	159	}
1da177e4	160
bec5eb61	161	/*
4d673da1 DH	162	* Create an inode for a dynamic root directory or an autocell dynamic
4d673da1 DH	163	* automount dir.
bec5eb61	164	*/
4d673da1	165	struct inode afs_iget_pseudo_dir(struct super_block sb, bool root)
bec5eb61	166	{
	167	struct afs_iget_data data;
	168	struct afs_super_info *as;
	169	struct afs_vnode *vnode;
bec5eb61	170	struct inode *inode;
	171	static atomic_t afs_autocell_ino;
	172
4d673da1	173	_enter("");
bec5eb61	174
bec5eb61	175	as = sb->s_fs_info;
4d673da1 DH	176	if (as->volume) {
	177	data.volume = as->volume;
	178	data.fid.vid = as->volume->vid;
	179	}
	180	if (root) {
	181	data.fid.vnode = 1;
	182	data.fid.unique = 1;
	183	} else {
	184	data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
	185	data.fid.unique = 0;
	186	}
bec5eb61	187
4d673da1 DH	188	inode = iget5_locked(sb, data.fid.vnode,
4d673da1 DH	189	afs_iget5_pseudo_dir_test, afs_iget5_set,
bec5eb61	190	&data);
	191	if (!inode) {
	192	_leave(" = -ENOMEM");
	193	return ERR_PTR(-ENOMEM);
	194	}
	195
	196	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
	197	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	198	data.fid.unique);
	199
	200	vnode = AFS_FS_I(inode);
	201
	202	/* there shouldn't be an existing inode */
	203	BUG_ON(!(inode->i_state & I_NEW));
	204
	205	inode->i_size = 0;
	206	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
4d673da1 DH	207	if (root) {
	208	inode->i_op = &afs_dynroot_inode_operations;
	209	inode->i_fop = &afs_dynroot_file_operations;
	210	} else {
	211	inode->i_op = &afs_autocell_inode_operations;
	212	}
bfe86848	213	set_nlink(inode, 2);
a0a5386a EB	214	inode->i_uid = GLOBAL_ROOT_UID;
a0a5386a EB	215	inode->i_gid = GLOBAL_ROOT_GID;
bec5eb61	216	inode->i_ctime.tv_sec = get_seconds();
	217	inode->i_ctime.tv_nsec = 0;
	218	inode->i_atime = inode->i_mtime = inode->i_ctime;
	219	inode->i_blocks = 0;
a01179e6	220	inode_set_iversion_raw(inode, 0);
bec5eb61	221	inode->i_generation = 0;
	222
	223	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
4d673da1 DH	224	if (!root) {
	225	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	226	inode->i_flags \|= S_AUTOMOUNT;
	227	}
	228
	229	inode->i_flags \|= S_NOATIME;
bec5eb61	230	unlock_new_inode(inode);
	231	_leave(" = %p", inode);
	232	return inode;
	233	}
	234
402cb8dd DH	235	/*
	236	* Get a cache cookie for an inode.
	237	*/
	238	static void afs_get_inode_cache(struct afs_vnode *vnode)
	239	{
	240	#ifdef CONFIG_AFS_FSCACHE
	241	struct {
	242	u32 vnode_id;
	243	u32 unique;
	244	u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
	245	} __packed key;
	246	struct afs_vnode_cache_aux aux;
	247
f3ddee8d DH	248	if (vnode->status.type == AFS_FTYPE_DIR) {
	249	vnode->cache = NULL;
	250	return;
	251	}
	252
402cb8dd DH	253	key.vnode_id = vnode->fid.vnode;
	254	key.unique = vnode->fid.unique;
	255	key.vnode_id_ext[0] = 0;
	256	key.vnode_id_ext[1] = 0;
	257	aux.data_version = vnode->status.data_version;
	258
	259	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	260	&afs_vnode_cache_index_def,
	261	&key, sizeof(key),
	262	&aux, sizeof(aux),
ee1235a9	263	vnode, vnode->status.size, true);
402cb8dd DH	264	#endif
	265	}
	266
1da177e4 LT	267	/*
	268	* inode retrieval
	269	*/
260a9803 DH	270	struct inode afs_iget(struct super_block sb, struct key *key,
260a9803 DH	271	struct afs_fid fid, struct afs_file_status status,
d2ddc776	272	struct afs_callback cb, struct afs_cb_interest cbi)
1da177e4 LT	273	{
	274	struct afs_iget_data data = { .fid = *fid };
	275	struct afs_super_info *as;
	276	struct afs_vnode *vnode;
	277	struct inode *inode;
	278	int ret;
	279
416351f2	280	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	281
	282	as = sb->s_fs_info;
	283	data.volume = as->volume;
	284
	285	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	286	&data);
	287	if (!inode) {
	288	_leave(" = -ENOMEM");
08e0e7c8	289	return ERR_PTR(-ENOMEM);
1da177e4 LT	290	}
1da177e4 LT	291
08e0e7c8 DH	292	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	293	inode, fid->vid, fid->vnode, fid->unique);
	294
1da177e4 LT	295	vnode = AFS_FS_I(inode);
	296
	297	/* deal with an existing inode */
	298	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	299	_leave(" = %p", inode);
08e0e7c8 DH	300	return inode;
1da177e4 LT	301	}
1da177e4 LT	302
260a9803 DH	303	if (!status) {
260a9803 DH	304	/* it's a remotely extant inode */
0c3a5ac2	305	ret = afs_fetch_status(vnode, key, true);
260a9803 DH	306	if (ret < 0)
	307	goto bad_inode;
	308	} else {
	309	/* it's an inode we just created */
	310	memcpy(&vnode->status, status, sizeof(vnode->status));
	311
	312	if (!cb) {
	313	/* it's a symlink we just created (the fileserver
	314	* didn't give us a callback) */
	315	vnode->cb_version = 0;
260a9803	316	vnode->cb_type = 0;
c435ee34	317	vnode->cb_expires_at = 0;
260a9803 DH	318	} else {
260a9803 DH	319	vnode->cb_version = cb->version;
260a9803	320	vnode->cb_type = cb->type;
c435ee34	321	vnode->cb_expires_at = cb->expiry;
d2ddc776	322	vnode->cb_interest = afs_get_cb_interest(cbi);
c435ee34	323	set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
260a9803	324	}
c435ee34 DH	325
c435ee34 DH	326	vnode->cb_expires_at += ktime_get_real_seconds();
260a9803 DH	327	}
260a9803 DH	328
dd9fbcb8	329	ret = afs_inode_init_from_status(vnode, key);
08e0e7c8	330	if (ret < 0)
1da177e4 LT	331	goto bad_inode;
1da177e4 LT	332
5800db81 DH	333	afs_get_inode_cache(vnode);
5800db81 DH	334
1da177e4	335	/* success */
260a9803	336	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	337	inode->i_flags \|= S_NOATIME;
1da177e4	338	unlock_new_inode(inode);
08e0e7c8 DH	339	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	340	return inode;
1da177e4 LT	341
1da177e4 LT	342	/* failure */
ec26815a	343	bad_inode:
aa7fa240	344	iget_failed(inode);
1da177e4	345	_leave(" = %d [bad]", ret);
08e0e7c8	346	return ERR_PTR(ret);
ec26815a	347	}
1da177e4	348
416351f2 DH	349	/*
	350	* mark the data attached to an inode as obsolete due to a write on the server
	351	* - might also want to ditch all the outstanding writes and dirty pages
	352	*/
	353	void afs_zap_data(struct afs_vnode *vnode)
	354	{
0f300ca9	355	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2	356
c1515999 DH	357	#ifdef CONFIG_AFS_FSCACHE
	358	fscache_invalidate(vnode->cache);
	359	#endif
	360
416351f2	361	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	362	* written back in a regular file and completely discard the pages in a
	363	* directory or symlink */
	364	if (S_ISREG(vnode->vfs_inode.i_mode))
	365	invalidate_remote_inode(&vnode->vfs_inode);
	366	else
	367	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	368	}
416351f2 DH	369
260a9803 DH	370	/*
	371	* validate a vnode/inode
	372	* - there are several things we need to check
	373	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	374	* symlink)
	375	* - parent dir metadata changed (security changes)
	376	* - dentry data changed (write, truncate)
	377	* - dentry metadata changed (security changes)
	378	*/
	379	int afs_validate(struct afs_vnode vnode, struct key key)
	380	{
c435ee34 DH	381	time64_t now = ktime_get_real_seconds();
c435ee34 DH	382	bool valid = false;
260a9803 DH	383	int ret;
	384
	385	_enter("{v={%x:%u} fl=%lx},%x",
	386	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	387	key_serial(key));
	388
c435ee34 DH	389	/* Quickly check the callback state. Ideally, we'd use read_seqbegin
	390	* here, but we have no way to pass the net namespace to the RCU
	391	* cleanup for the server record.
	392	*/
	393	read_seqlock_excl(&vnode->cb_lock);
	394
	395	if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
	396	if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break) {
	397	vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
63a4681f DH	398	} else if (vnode->status.type == AFS_FTYPE_DIR &&
	399	test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
	400	vnode->cb_expires_at - 10 > now) {
	401	valid = true;
	402	} else if (!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
c435ee34 DH	403	vnode->cb_expires_at - 10 > now) {
c435ee34 DH	404	valid = true;
260a9803	405	}
c435ee34 DH	406	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
c435ee34 DH	407	valid = true;
260a9803 DH	408	}
260a9803 DH	409
c435ee34	410	read_sequnlock_excl(&vnode->cb_lock);
440fbc3a DH	411
	412	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	413	clear_nlink(&vnode->vfs_inode);
	414
c435ee34	415	if (valid)
260a9803 DH	416	goto valid;
	417
	418	mutex_lock(&vnode->validate_lock);
	419
	420	/* if the promise has expired, we need to check the server again to get
	421	* a new promise - note that if the (parent) directory's metadata was
	422	* changed then the security may be different and we may no longer have
	423	* access */
c435ee34	424	if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
260a9803	425	_debug("not promised");
0c3a5ac2	426	ret = afs_fetch_status(vnode, key, false);
c435ee34 DH	427	if (ret < 0) {
	428	if (ret == -ENOENT) {
	429	set_bit(AFS_VNODE_DELETED, &vnode->flags);
	430	ret = -ESTALE;
	431	}
260a9803	432	goto error_unlock;
c435ee34	433	}
260a9803 DH	434	_debug("new promise [fl=%lx]", vnode->flags);
	435	}
	436
	437	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	438	_debug("file already deleted");
	439	ret = -ESTALE;
	440	goto error_unlock;
	441	}
	442
	443	/* if the vnode's data version number changed then its contents are
	444	* different */
416351f2 DH	445	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	446	afs_zap_data(vnode);
260a9803 DH	447	mutex_unlock(&vnode->validate_lock);
	448	valid:
	449	_leave(" = 0");
	450	return 0;
	451
	452	error_unlock:
	453	mutex_unlock(&vnode->validate_lock);
	454	_leave(" = %d", ret);
	455	return ret;
	456	}
	457
1da177e4 LT	458	/*
	459	* read the attributes of an inode
	460	*/
a528d35e DH	461	int afs_getattr(const struct path path, struct kstat stat,
a528d35e DH	462	u32 request_mask, unsigned int query_flags)
1da177e4	463	{
a528d35e	464	struct inode *inode = d_inode(path->dentry);
c435ee34 DH	465	struct afs_vnode *vnode = AFS_FS_I(inode);
c435ee34 DH	466	int seq = 0;
1da177e4	467
d6e43f75	468	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
1da177e4	469
c435ee34 DH	470	do {
	471	read_seqbegin_or_lock(&vnode->cb_lock, &seq);
	472	generic_fillattr(inode, stat);
	473	} while (need_seqretry(&vnode->cb_lock, seq));
	474
	475	done_seqretry(&vnode->cb_lock, seq);
1da177e4	476	return 0;
ec26815a	477	}
1da177e4	478
bec5eb61	479	/*
	480	* discard an AFS inode
	481	*/
	482	int afs_drop_inode(struct inode *inode)
	483	{
	484	_enter("");
	485
	486	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	487	return generic_delete_inode(inode);
	488	else
	489	return generic_drop_inode(inode);
	490	}
	491
1da177e4 LT	492	/*
	493	* clear an AFS inode
	494	*/
b57922d9	495	void afs_evict_inode(struct inode *inode)
1da177e4 LT	496	{
	497	struct afs_vnode *vnode;
	498
	499	vnode = AFS_FS_I(inode);
	500
c435ee34	501	_enter("{%x:%u.%d}",
260a9803	502	vnode->fid.vid,
1da177e4	503	vnode->fid.vnode,
c435ee34	504	vnode->fid.unique);
1da177e4	505
08e0e7c8 DH	506	_debug("CLEAR INODE %p", inode);
	507
	508	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	509
91b0abe3	510	truncate_inode_pages_final(&inode->i_data);
dbd5768f	511	clear_inode(inode);
b57922d9	512
c435ee34 DH	513	if (vnode->cb_interest) {
	514	afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
	515	vnode->cb_interest = NULL;
08e0e7c8	516	}
1da177e4	517
4343d008 DH	518	while (!list_empty(&vnode->wb_keys)) {
	519	struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
	520	struct afs_wb_key, vnode_link);
	521	list_del(&wbk->vnode_link);
	522	afs_put_wb_key(wbk);
	523	}
1da177e4	524
9b3f26c9	525	#ifdef CONFIG_AFS_FSCACHE
402cb8dd DH	526	{
	527	struct afs_vnode_cache_aux aux;
	528
	529	aux.data_version = vnode->status.data_version;
	530	fscache_relinquish_cookie(vnode->cache, &aux,
	531	test_bit(AFS_VNODE_DELETED, &vnode->flags));
	532	vnode->cache = NULL;
	533	}
1da177e4 LT	534	#endif
1da177e4 LT	535
fe342cf7	536	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
1da177e4	537	_leave("");
ec26815a	538	}
31143d5d DH	539
	540	/*
	541	* set the attributes of an inode
	542	*/
	543	int afs_setattr(struct dentry dentry, struct iattr attr)
	544	{
d2ddc776	545	struct afs_fs_cursor fc;
2b0143b5	546	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
31143d5d DH	547	struct key *key;
	548	int ret;
	549
a455589f AV	550	_enter("{%x:%u},{n=%pd},%x",
a455589f AV	551	vnode->fid.vid, vnode->fid.vnode, dentry,
31143d5d DH	552	attr->ia_valid);
	553
	554	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	555	ATTR_MTIME))) {
	556	_leave(" = 0 [unsupported]");
	557	return 0;
	558	}
	559
	560	/* flush any dirty data outstanding on a regular file */
4343d008	561	if (S_ISREG(vnode->vfs_inode.i_mode))
31143d5d	562	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
31143d5d DH	563
31143d5d DH	564	if (attr->ia_valid & ATTR_FILE) {
215804a9	565	key = afs_file_key(attr->ia_file);
31143d5d DH	566	} else {
	567	key = afs_request_key(vnode->volume->cell);
	568	if (IS_ERR(key)) {
	569	ret = PTR_ERR(key);
	570	goto error;
	571	}
	572	}
	573
d2ddc776 DH	574	ret = -ERESTARTSYS;
	575	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	576	while (afs_select_fileserver(&fc)) {
	577	fc.cb_break = vnode->cb_break + vnode->cb_s_break;
	578	afs_fs_setattr(&fc, attr);
	579	}
	580
	581	afs_check_for_remote_deletion(&fc, fc.vnode);
	582	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	583	ret = afs_end_vnode_operation(&fc);
	584	}
	585
31143d5d DH	586	if (!(attr->ia_valid & ATTR_FILE))
	587	key_put(key);
	588
	589	error:
	590	_leave(" = %d", ret);
	591	return ret;
	592	}