[linux.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 <[email protected]>
 *          David Howells <[email protected]>
 *
 */

#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;
		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;

			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;
		} 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");
		read_sequnlock_excl(&vnode->cb_lock);
		return -EBADMSG;
	}

	inode->i_blocks		= 0;
	inode->i_mapping->a_ops	= &afs_fs_aops;
	vnode->invalid_before	= vnode->status.data_version;

	read_sequnlock_excl(&vnode->cb_lock);

#ifdef CONFIG_AFS_FSCACHE
	if (vnode->status.size > 0)
		fscache_attr_changed(vnode->cache);
#endif
	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;

	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:
#ifdef CONFIG_AFS_FSCACHE
	fscache_relinquish_cookie(vnode->cache, NULL, ret == -ENOENT);
	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);

	if (S_ISDIR(vnode->vfs_inode.i_mode))
		afs_stat_v(vnode, n_inval);

#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 (!test_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags) &&
			   !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);

	clear_bit(AFS_VNODE_DIR_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);
	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 <[email protected]>
1da177e4 LT	12	* David Howells <[email protected]>
	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;
1da177e4 LT	56	break;
	57	case AFS_FTYPE_DIR:
	58	inode->i_mode = S_IFDIR \| vnode->status.mode;
	59	inode->i_op = &afs_dir_inode_operations;
	60	inode->i_fop = &afs_dir_file_operations;
	61	break;
	62	case AFS_FTYPE_SYMLINK:
944c74f4 DH	63	/* Symlinks with a mode of 0644 are actually mountpoints. */
	64	if ((vnode->status.mode & 0777) == 0644) {
	65	inode->i_flags \|= S_AUTOMOUNT;
	66
944c74f4	67	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
944c74f4 DH	68
	69	inode->i_mode = S_IFDIR \| 0555;
	70	inode->i_op = &afs_mntpt_inode_operations;
	71	inode->i_fop = &afs_mntpt_file_operations;
	72	} else {
	73	inode->i_mode = S_IFLNK \| vnode->status.mode;
d3e3b7ea	74	inode->i_op = &afs_symlink_inode_operations;
944c74f4	75	}
21fc61c7	76	inode_nohighmem(inode);
1da177e4 LT	77	break;
	78	default:
	79	printk("kAFS: AFS vnode with undefined type\n");
c435ee34	80	read_sequnlock_excl(&vnode->cb_lock);
1da177e4 LT	81	return -EBADMSG;
	82	}
	83
1da177e4	84	inode->i_blocks = 0;
1da177e4	85	inode->i_mapping->a_ops = &afs_fs_aops;
a4ff7401	86	vnode->invalid_before = vnode->status.data_version;
c435ee34 DH	87
	88	read_sequnlock_excl(&vnode->cb_lock);
	89
	90	#ifdef CONFIG_AFS_FSCACHE
dd9fbcb8	91	if (vnode->status.size > 0)
c435ee34 DH	92	fscache_attr_changed(vnode->cache);
c435ee34 DH	93	#endif
1da177e4	94	return 0;
ec26815a	95	}
1da177e4	96
d2ddc776 DH	97	/*
	98	* Fetch file status from the volume.
	99	*/
0c3a5ac2	100	int afs_fetch_status(struct afs_vnode vnode, struct key key, bool new_inode)
d2ddc776 DH	101	{
	102	struct afs_fs_cursor fc;
	103	int ret;
	104
	105	_enter("%s,{%x:%u.%u,S=%lx}",
	106	vnode->volume->name,
	107	vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
	108	vnode->flags);
	109
	110	ret = -ERESTARTSYS;
	111	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	112	while (afs_select_fileserver(&fc)) {
	113	fc.cb_break = vnode->cb_break + vnode->cb_s_break;
0c3a5ac2	114	afs_fs_fetch_file_status(&fc, NULL, new_inode);
d2ddc776 DH	115	}
	116
	117	afs_check_for_remote_deletion(&fc, fc.vnode);
	118	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	119	ret = afs_end_vnode_operation(&fc);
	120	}
	121
	122	_leave(" = %d", ret);
	123	return ret;
	124	}
	125
1da177e4 LT	126	/*
	127	* iget5() comparator
	128	*/
c435ee34	129	int afs_iget5_test(struct inode inode, void opaque)
1da177e4 LT	130	{
	131	struct afs_iget_data *data = opaque;
	132
	133	return inode->i_ino == data->fid.vnode &&
d6e43f75	134	inode->i_generation == data->fid.unique;
ec26815a	135	}
1da177e4	136
bec5eb61	137	/*
	138	* iget5() comparator for inode created by autocell operations
	139	*
	140	* These pseudo inodes don't match anything.
	141	*/
4d673da1	142	static int afs_iget5_pseudo_dir_test(struct inode inode, void opaque)
bec5eb61	143	{
	144	return 0;
	145	}
	146
1da177e4 LT	147	/*
	148	* iget5() inode initialiser
	149	*/
	150	static int afs_iget5_set(struct inode inode, void opaque)
	151	{
	152	struct afs_iget_data *data = opaque;
	153	struct afs_vnode *vnode = AFS_FS_I(inode);
	154
	155	inode->i_ino = data->fid.vnode;
d6e43f75	156	inode->i_generation = data->fid.unique;
1da177e4 LT	157	vnode->fid = data->fid;
	158	vnode->volume = data->volume;
	159
	160	return 0;
ec26815a	161	}
1da177e4	162
bec5eb61	163	/*
4d673da1 DH	164	* Create an inode for a dynamic root directory or an autocell dynamic
4d673da1 DH	165	* automount dir.
bec5eb61	166	*/
4d673da1	167	struct inode afs_iget_pseudo_dir(struct super_block sb, bool root)
bec5eb61	168	{
	169	struct afs_iget_data data;
	170	struct afs_super_info *as;
	171	struct afs_vnode *vnode;
bec5eb61	172	struct inode *inode;
	173	static atomic_t afs_autocell_ino;
	174
4d673da1	175	_enter("");
bec5eb61	176
bec5eb61	177	as = sb->s_fs_info;
4d673da1 DH	178	if (as->volume) {
	179	data.volume = as->volume;
	180	data.fid.vid = as->volume->vid;
	181	}
	182	if (root) {
	183	data.fid.vnode = 1;
	184	data.fid.unique = 1;
	185	} else {
	186	data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
	187	data.fid.unique = 0;
	188	}
bec5eb61	189
4d673da1 DH	190	inode = iget5_locked(sb, data.fid.vnode,
4d673da1 DH	191	afs_iget5_pseudo_dir_test, afs_iget5_set,
bec5eb61	192	&data);
	193	if (!inode) {
	194	_leave(" = -ENOMEM");
	195	return ERR_PTR(-ENOMEM);
	196	}
	197
	198	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
	199	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	200	data.fid.unique);
	201
	202	vnode = AFS_FS_I(inode);
	203
	204	/* there shouldn't be an existing inode */
	205	BUG_ON(!(inode->i_state & I_NEW));
	206
	207	inode->i_size = 0;
	208	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
4d673da1 DH	209	if (root) {
	210	inode->i_op = &afs_dynroot_inode_operations;
	211	inode->i_fop = &afs_dynroot_file_operations;
	212	} else {
	213	inode->i_op = &afs_autocell_inode_operations;
	214	}
bfe86848	215	set_nlink(inode, 2);
a0a5386a EB	216	inode->i_uid = GLOBAL_ROOT_UID;
a0a5386a EB	217	inode->i_gid = GLOBAL_ROOT_GID;
bec5eb61	218	inode->i_ctime.tv_sec = get_seconds();
	219	inode->i_ctime.tv_nsec = 0;
	220	inode->i_atime = inode->i_mtime = inode->i_ctime;
	221	inode->i_blocks = 0;
a01179e6	222	inode_set_iversion_raw(inode, 0);
bec5eb61	223	inode->i_generation = 0;
	224
	225	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
4d673da1 DH	226	if (!root) {
	227	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	228	inode->i_flags \|= S_AUTOMOUNT;
	229	}
	230
	231	inode->i_flags \|= S_NOATIME;
bec5eb61	232	unlock_new_inode(inode);
	233	_leave(" = %p", inode);
	234	return inode;
	235	}
	236
402cb8dd DH	237	/*
	238	* Get a cache cookie for an inode.
	239	*/
	240	static void afs_get_inode_cache(struct afs_vnode *vnode)
	241	{
	242	#ifdef CONFIG_AFS_FSCACHE
	243	struct {
	244	u32 vnode_id;
	245	u32 unique;
	246	u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
	247	} __packed key;
	248	struct afs_vnode_cache_aux aux;
	249
	250	key.vnode_id = vnode->fid.vnode;
	251	key.unique = vnode->fid.unique;
	252	key.vnode_id_ext[0] = 0;
	253	key.vnode_id_ext[1] = 0;
	254	aux.data_version = vnode->status.data_version;
	255
	256	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	257	&afs_vnode_cache_index_def,
	258	&key, sizeof(key),
	259	&aux, sizeof(aux),
ee1235a9	260	vnode, vnode->status.size, true);
402cb8dd DH	261	#endif
	262	}
	263
1da177e4 LT	264	/*
	265	* inode retrieval
	266	*/
260a9803 DH	267	struct inode afs_iget(struct super_block sb, struct key *key,
260a9803 DH	268	struct afs_fid fid, struct afs_file_status status,
d2ddc776	269	struct afs_callback cb, struct afs_cb_interest cbi)
1da177e4 LT	270	{
	271	struct afs_iget_data data = { .fid = *fid };
	272	struct afs_super_info *as;
	273	struct afs_vnode *vnode;
	274	struct inode *inode;
	275	int ret;
	276
416351f2	277	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	278
	279	as = sb->s_fs_info;
	280	data.volume = as->volume;
	281
	282	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	283	&data);
	284	if (!inode) {
	285	_leave(" = -ENOMEM");
08e0e7c8	286	return ERR_PTR(-ENOMEM);
1da177e4 LT	287	}
1da177e4 LT	288
08e0e7c8 DH	289	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
	290	inode, fid->vid, fid->vnode, fid->unique);
	291
1da177e4 LT	292	vnode = AFS_FS_I(inode);
	293
	294	/* deal with an existing inode */
	295	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	296	_leave(" = %p", inode);
08e0e7c8 DH	297	return inode;
1da177e4 LT	298	}
1da177e4 LT	299
260a9803 DH	300	if (!status) {
260a9803 DH	301	/* it's a remotely extant inode */
0c3a5ac2	302	ret = afs_fetch_status(vnode, key, true);
260a9803 DH	303	if (ret < 0)
	304	goto bad_inode;
	305	} else {
	306	/* it's an inode we just created */
	307	memcpy(&vnode->status, status, sizeof(vnode->status));
	308
	309	if (!cb) {
	310	/* it's a symlink we just created (the fileserver
	311	* didn't give us a callback) */
	312	vnode->cb_version = 0;
260a9803	313	vnode->cb_type = 0;
c435ee34	314	vnode->cb_expires_at = 0;
260a9803 DH	315	} else {
260a9803 DH	316	vnode->cb_version = cb->version;
260a9803	317	vnode->cb_type = cb->type;
c435ee34	318	vnode->cb_expires_at = cb->expiry;
d2ddc776	319	vnode->cb_interest = afs_get_cb_interest(cbi);
c435ee34	320	set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
260a9803	321	}
c435ee34 DH	322
c435ee34 DH	323	vnode->cb_expires_at += ktime_get_real_seconds();
260a9803 DH	324	}
260a9803 DH	325
dd9fbcb8	326	ret = afs_inode_init_from_status(vnode, key);
08e0e7c8	327	if (ret < 0)
1da177e4 LT	328	goto bad_inode;
1da177e4 LT	329
5800db81 DH	330	afs_get_inode_cache(vnode);
5800db81 DH	331
1da177e4	332	/* success */
260a9803	333	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	334	inode->i_flags \|= S_NOATIME;
1da177e4	335	unlock_new_inode(inode);
08e0e7c8 DH	336	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	337	return inode;
1da177e4 LT	338
1da177e4 LT	339	/* failure */
ec26815a	340	bad_inode:
9b3f26c9	341	#ifdef CONFIG_AFS_FSCACHE
402cb8dd	342	fscache_relinquish_cookie(vnode->cache, NULL, ret == -ENOENT);
9b3f26c9 DH	343	vnode->cache = NULL;
9b3f26c9 DH	344	#endif
aa7fa240	345	iget_failed(inode);
1da177e4	346	_leave(" = %d [bad]", ret);
08e0e7c8	347	return ERR_PTR(ret);
ec26815a	348	}
1da177e4	349
416351f2 DH	350	/*
	351	* mark the data attached to an inode as obsolete due to a write on the server
	352	* - might also want to ditch all the outstanding writes and dirty pages
	353	*/
	354	void afs_zap_data(struct afs_vnode *vnode)
	355	{
0f300ca9	356	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
416351f2	357
d55b4da4 DH	358	if (S_ISDIR(vnode->vfs_inode.i_mode))
	359	afs_stat_v(vnode, n_inval);
	360
c1515999 DH	361	#ifdef CONFIG_AFS_FSCACHE
	362	fscache_invalidate(vnode->cache);
	363	#endif
	364
416351f2	365	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	366	* written back in a regular file and completely discard the pages in a
	367	* directory or symlink */
	368	if (S_ISREG(vnode->vfs_inode.i_mode))
	369	invalidate_remote_inode(&vnode->vfs_inode);
	370	else
	371	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	372	}
416351f2 DH	373
260a9803 DH	374	/*
	375	* validate a vnode/inode
	376	* - there are several things we need to check
	377	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	378	* symlink)
	379	* - parent dir metadata changed (security changes)
	380	* - dentry data changed (write, truncate)
	381	* - dentry metadata changed (security changes)
	382	*/
	383	int afs_validate(struct afs_vnode vnode, struct key key)
	384	{
c435ee34 DH	385	time64_t now = ktime_get_real_seconds();
c435ee34 DH	386	bool valid = false;
260a9803 DH	387	int ret;
	388
	389	_enter("{v={%x:%u} fl=%lx},%x",
	390	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	391	key_serial(key));
	392
c435ee34 DH	393	/* Quickly check the callback state. Ideally, we'd use read_seqbegin
	394	* here, but we have no way to pass the net namespace to the RCU
	395	* cleanup for the server record.
	396	*/
	397	read_seqlock_excl(&vnode->cb_lock);
	398
	399	if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
	400	if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break) {
	401	vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
	402	} else if (!test_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags) &&
	403	!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
	404	vnode->cb_expires_at - 10 > now) {
	405	valid = true;
260a9803	406	}
c435ee34 DH	407	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
c435ee34 DH	408	valid = true;
260a9803 DH	409	}
260a9803 DH	410
c435ee34	411	read_sequnlock_excl(&vnode->cb_lock);
440fbc3a DH	412
	413	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	414	clear_nlink(&vnode->vfs_inode);
	415
c435ee34	416	if (valid)
260a9803 DH	417	goto valid;
	418
	419	mutex_lock(&vnode->validate_lock);
	420
	421	/* if the promise has expired, we need to check the server again to get
	422	* a new promise - note that if the (parent) directory's metadata was
	423	* changed then the security may be different and we may no longer have
	424	* access */
c435ee34	425	if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
260a9803	426	_debug("not promised");
0c3a5ac2	427	ret = afs_fetch_status(vnode, key, false);
c435ee34 DH	428	if (ret < 0) {
	429	if (ret == -ENOENT) {
	430	set_bit(AFS_VNODE_DELETED, &vnode->flags);
	431	ret = -ESTALE;
	432	}
260a9803	433	goto error_unlock;
c435ee34	434	}
260a9803 DH	435	_debug("new promise [fl=%lx]", vnode->flags);
	436	}
	437
	438	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	439	_debug("file already deleted");
	440	ret = -ESTALE;
	441	goto error_unlock;
	442	}
	443
	444	/* if the vnode's data version number changed then its contents are
	445	* different */
416351f2 DH	446	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	447	afs_zap_data(vnode);
260a9803	448
c435ee34	449	clear_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags);
260a9803 DH	450	mutex_unlock(&vnode->validate_lock);
	451	valid:
	452	_leave(" = 0");
	453	return 0;
	454
	455	error_unlock:
	456	mutex_unlock(&vnode->validate_lock);
	457	_leave(" = %d", ret);
	458	return ret;
	459	}
	460
1da177e4 LT	461	/*
	462	* read the attributes of an inode
	463	*/
a528d35e DH	464	int afs_getattr(const struct path path, struct kstat stat,
a528d35e DH	465	u32 request_mask, unsigned int query_flags)
1da177e4	466	{
a528d35e	467	struct inode *inode = d_inode(path->dentry);
c435ee34 DH	468	struct afs_vnode *vnode = AFS_FS_I(inode);
c435ee34 DH	469	int seq = 0;
1da177e4	470
d6e43f75	471	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
1da177e4	472
c435ee34 DH	473	do {
	474	read_seqbegin_or_lock(&vnode->cb_lock, &seq);
	475	generic_fillattr(inode, stat);
	476	} while (need_seqretry(&vnode->cb_lock, seq));
	477
	478	done_seqretry(&vnode->cb_lock, seq);
1da177e4	479	return 0;
ec26815a	480	}
1da177e4	481
bec5eb61	482	/*
	483	* discard an AFS inode
	484	*/
	485	int afs_drop_inode(struct inode *inode)
	486	{
	487	_enter("");
	488
	489	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	490	return generic_delete_inode(inode);
	491	else
	492	return generic_drop_inode(inode);
	493	}
	494
1da177e4 LT	495	/*
	496	* clear an AFS inode
	497	*/
b57922d9	498	void afs_evict_inode(struct inode *inode)
1da177e4 LT	499	{
	500	struct afs_vnode *vnode;
	501
	502	vnode = AFS_FS_I(inode);
	503
c435ee34	504	_enter("{%x:%u.%d}",
260a9803	505	vnode->fid.vid,
1da177e4	506	vnode->fid.vnode,
c435ee34	507	vnode->fid.unique);
1da177e4	508
08e0e7c8 DH	509	_debug("CLEAR INODE %p", inode);
	510
	511	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	512
91b0abe3	513	truncate_inode_pages_final(&inode->i_data);
dbd5768f	514	clear_inode(inode);
b57922d9	515
c435ee34 DH	516	if (vnode->cb_interest) {
	517	afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
	518	vnode->cb_interest = NULL;
08e0e7c8	519	}
1da177e4	520
4343d008 DH	521	while (!list_empty(&vnode->wb_keys)) {
	522	struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
	523	struct afs_wb_key, vnode_link);
	524	list_del(&wbk->vnode_link);
	525	afs_put_wb_key(wbk);
	526	}
1da177e4	527
9b3f26c9	528	#ifdef CONFIG_AFS_FSCACHE
402cb8dd DH	529	{
	530	struct afs_vnode_cache_aux aux;
	531
	532	aux.data_version = vnode->status.data_version;
	533	fscache_relinquish_cookie(vnode->cache, &aux,
	534	test_bit(AFS_VNODE_DELETED, &vnode->flags));
	535	vnode->cache = NULL;
	536	}
1da177e4 LT	537	#endif
1da177e4 LT	538
fe342cf7	539	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
1da177e4	540	_leave("");
ec26815a	541	}
31143d5d DH	542
	543	/*
	544	* set the attributes of an inode
	545	*/
	546	int afs_setattr(struct dentry dentry, struct iattr attr)
	547	{
d2ddc776	548	struct afs_fs_cursor fc;
2b0143b5	549	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
31143d5d DH	550	struct key *key;
	551	int ret;
	552
a455589f AV	553	_enter("{%x:%u},{n=%pd},%x",
a455589f AV	554	vnode->fid.vid, vnode->fid.vnode, dentry,
31143d5d DH	555	attr->ia_valid);
	556
	557	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	558	ATTR_MTIME))) {
	559	_leave(" = 0 [unsupported]");
	560	return 0;
	561	}
	562
	563	/* flush any dirty data outstanding on a regular file */
4343d008	564	if (S_ISREG(vnode->vfs_inode.i_mode))
31143d5d	565	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
31143d5d DH	566
31143d5d DH	567	if (attr->ia_valid & ATTR_FILE) {
215804a9	568	key = afs_file_key(attr->ia_file);
31143d5d DH	569	} else {
	570	key = afs_request_key(vnode->volume->cell);
	571	if (IS_ERR(key)) {
	572	ret = PTR_ERR(key);
	573	goto error;
	574	}
	575	}
	576
d2ddc776 DH	577	ret = -ERESTARTSYS;
	578	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	579	while (afs_select_fileserver(&fc)) {
	580	fc.cb_break = vnode->cb_break + vnode->cb_s_break;
	581	afs_fs_setattr(&fc, attr);
	582	}
	583
	584	afs_check_for_remote_deletion(&fc, fc.vnode);
	585	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	586	ret = afs_end_vnode_operation(&fc);
	587	}
	588
31143d5d DH	589	if (!(attr->ia_valid & ATTR_FILE))
	590	key_put(key);
	591
	592	error:
	593	_leave(" = %d", ret);
	594	return ret;
	595	}