[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;
		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, afs_eproto_file_type);
	}

	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,{%llx:%llu.%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 = afs_calc_vnode_cb_break(vnode);
			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;
	struct afs_vnode *vnode = AFS_FS_I(inode);

	return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
}

/*
 * 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);

	vnode->fid = data->fid;
	vnode->volume = data->volume;

	/* YFS supports 96-bit vnode IDs, but Linux only supports
	 * 64-bit inode numbers.
	 */
	inode->i_ino = data->fid.vnode;
	inode->i_generation = data->fid.unique;
	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=%llx, vn=%llx, 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]	= vnode->fid.vnode >> 32;
	key.vnode_id_ext[1]	= vnode->fid.vnode_hi;
	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(",{%llx:%llu.%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=%llx vn=%llx, 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 = ktime_get();
		} else {
			vnode->cb_version = cb->version;
			vnode->cb_type = cb->type;
			vnode->cb_expires_at = cb->expires_at;
			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("{%llx:%llu}", 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;
	int ret;

	_enter("{v={%llx:%llu} 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_v_break != vnode->volume->cb_v_break) {
			vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
			vnode->cb_v_break = vnode->volume->cb_v_break;
			valid = false;
		} else if (vnode->status.type == AFS_FTYPE_DIR &&
			   (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
			    vnode->cb_expires_at - 10 <= now)) {
			valid = false;
		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
			   vnode->cb_expires_at - 10 <= now) {
			valid = false;
		} else {
			valid = true;
		}
	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
		valid = true;
	} else {
		vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
		vnode->cb_v_break = vnode->volume->cb_v_break;
		valid = false;
	}

	read_sequnlock_excl(&vnode->cb_lock);

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

	if (valid)
		goto valid;

	down_write(&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);
	up_write(&vnode->validate_lock);
valid:
	_leave(" = 0");
	return 0;

error_unlock:
	up_write(&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("{%llx:%llu.%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("{%llx:%llu},{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 = afs_calc_vnode_cb_break(vnode);
			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;
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);
160cb957	85	return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
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
3b6492df	103	_enter("%s,{%llx:%llu.%u,S=%lx}",
d2ddc776 DH	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)) {
68251f0a	111	fc.cb_break = afs_calc_vnode_cb_break(vnode);
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	{
1da177e4 LT	129	struct afs_iget_data *data = opaque;
3b6492df	130	struct afs_vnode *vnode = AFS_FS_I(inode);
1da177e4	131
3b6492df	132	return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
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
1da177e4 LT	153	vnode->fid = data->fid;
	154	vnode->volume = data->volume;
	155
3b6492df DH	156	/* YFS supports 96-bit vnode IDs, but Linux only supports
	157	* 64-bit inode numbers.
	158	*/
	159	inode->i_ino = data->fid.vnode;
	160	inode->i_generation = data->fid.unique;
1da177e4	161	return 0;
ec26815a	162	}
1da177e4	163
bec5eb61	164	/*
4d673da1 DH	165	* Create an inode for a dynamic root directory or an autocell dynamic
4d673da1 DH	166	* automount dir.
bec5eb61	167	*/
4d673da1	168	struct inode afs_iget_pseudo_dir(struct super_block sb, bool root)
bec5eb61	169	{
	170	struct afs_iget_data data;
	171	struct afs_super_info *as;
	172	struct afs_vnode *vnode;
bec5eb61	173	struct inode *inode;
	174	static atomic_t afs_autocell_ino;
	175
4d673da1	176	_enter("");
bec5eb61	177
bec5eb61	178	as = sb->s_fs_info;
4d673da1 DH	179	if (as->volume) {
	180	data.volume = as->volume;
	181	data.fid.vid = as->volume->vid;
	182	}
	183	if (root) {
	184	data.fid.vnode = 1;
	185	data.fid.unique = 1;
	186	} else {
	187	data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
	188	data.fid.unique = 0;
	189	}
bec5eb61	190
4d673da1 DH	191	inode = iget5_locked(sb, data.fid.vnode,
4d673da1 DH	192	afs_iget5_pseudo_dir_test, afs_iget5_set,
bec5eb61	193	&data);
	194	if (!inode) {
	195	_leave(" = -ENOMEM");
	196	return ERR_PTR(-ENOMEM);
	197	}
	198
3b6492df	199	_debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
bec5eb61	200	inode, inode->i_ino, data.fid.vid, data.fid.vnode,
	201	data.fid.unique);
	202
	203	vnode = AFS_FS_I(inode);
	204
	205	/* there shouldn't be an existing inode */
	206	BUG_ON(!(inode->i_state & I_NEW));
	207
	208	inode->i_size = 0;
	209	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
4d673da1 DH	210	if (root) {
	211	inode->i_op = &afs_dynroot_inode_operations;
	212	inode->i_fop = &afs_dynroot_file_operations;
	213	} else {
	214	inode->i_op = &afs_autocell_inode_operations;
	215	}
bfe86848	216	set_nlink(inode, 2);
a0a5386a EB	217	inode->i_uid = GLOBAL_ROOT_UID;
a0a5386a EB	218	inode->i_gid = GLOBAL_ROOT_GID;
bec5eb61	219	inode->i_ctime.tv_sec = get_seconds();
	220	inode->i_ctime.tv_nsec = 0;
	221	inode->i_atime = inode->i_mtime = inode->i_ctime;
	222	inode->i_blocks = 0;
a01179e6	223	inode_set_iversion_raw(inode, 0);
bec5eb61	224	inode->i_generation = 0;
	225
	226	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
4d673da1 DH	227	if (!root) {
	228	set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
	229	inode->i_flags \|= S_AUTOMOUNT;
	230	}
	231
	232	inode->i_flags \|= S_NOATIME;
bec5eb61	233	unlock_new_inode(inode);
	234	_leave(" = %p", inode);
	235	return inode;
	236	}
	237
402cb8dd DH	238	/*
	239	* Get a cache cookie for an inode.
	240	*/
	241	static void afs_get_inode_cache(struct afs_vnode *vnode)
	242	{
	243	#ifdef CONFIG_AFS_FSCACHE
	244	struct {
	245	u32 vnode_id;
	246	u32 unique;
	247	u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
	248	} __packed key;
	249	struct afs_vnode_cache_aux aux;
	250
f3ddee8d DH	251	if (vnode->status.type == AFS_FTYPE_DIR) {
	252	vnode->cache = NULL;
	253	return;
	254	}
	255
402cb8dd DH	256	key.vnode_id = vnode->fid.vnode;
402cb8dd DH	257	key.unique = vnode->fid.unique;
3b6492df DH	258	key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
3b6492df DH	259	key.vnode_id_ext[1] = vnode->fid.vnode_hi;
402cb8dd DH	260	aux.data_version = vnode->status.data_version;
	261
	262	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
	263	&afs_vnode_cache_index_def,
	264	&key, sizeof(key),
	265	&aux, sizeof(aux),
ee1235a9	266	vnode, vnode->status.size, true);
402cb8dd DH	267	#endif
	268	}
	269
1da177e4 LT	270	/*
	271	* inode retrieval
	272	*/
260a9803 DH	273	struct inode afs_iget(struct super_block sb, struct key *key,
260a9803 DH	274	struct afs_fid fid, struct afs_file_status status,
d2ddc776	275	struct afs_callback cb, struct afs_cb_interest cbi)
1da177e4 LT	276	{
	277	struct afs_iget_data data = { .fid = *fid };
	278	struct afs_super_info *as;
	279	struct afs_vnode *vnode;
	280	struct inode *inode;
	281	int ret;
	282
3b6492df	283	_enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
1da177e4 LT	284
	285	as = sb->s_fs_info;
	286	data.volume = as->volume;
	287
	288	inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
	289	&data);
	290	if (!inode) {
	291	_leave(" = -ENOMEM");
08e0e7c8	292	return ERR_PTR(-ENOMEM);
1da177e4 LT	293	}
1da177e4 LT	294
3b6492df	295	_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
08e0e7c8 DH	296	inode, fid->vid, fid->vnode, fid->unique);
08e0e7c8 DH	297
1da177e4 LT	298	vnode = AFS_FS_I(inode);
	299
	300	/* deal with an existing inode */
	301	if (!(inode->i_state & I_NEW)) {
08e0e7c8 DH	302	_leave(" = %p", inode);
08e0e7c8 DH	303	return inode;
1da177e4 LT	304	}
1da177e4 LT	305
260a9803 DH	306	if (!status) {
260a9803 DH	307	/* it's a remotely extant inode */
0c3a5ac2	308	ret = afs_fetch_status(vnode, key, true);
260a9803 DH	309	if (ret < 0)
	310	goto bad_inode;
	311	} else {
	312	/* it's an inode we just created */
	313	memcpy(&vnode->status, status, sizeof(vnode->status));
	314
	315	if (!cb) {
	316	/* it's a symlink we just created (the fileserver
	317	* didn't give us a callback) */
	318	vnode->cb_version = 0;
260a9803	319	vnode->cb_type = 0;
12d8e95a	320	vnode->cb_expires_at = ktime_get();
260a9803 DH	321	} else {
260a9803 DH	322	vnode->cb_version = cb->version;
260a9803	323	vnode->cb_type = cb->type;
12d8e95a	324	vnode->cb_expires_at = cb->expires_at;
d2ddc776	325	vnode->cb_interest = afs_get_cb_interest(cbi);
c435ee34	326	set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
260a9803	327	}
c435ee34 DH	328
c435ee34 DH	329	vnode->cb_expires_at += ktime_get_real_seconds();
260a9803 DH	330	}
260a9803 DH	331
dd9fbcb8	332	ret = afs_inode_init_from_status(vnode, key);
08e0e7c8	333	if (ret < 0)
1da177e4 LT	334	goto bad_inode;
1da177e4 LT	335
5800db81 DH	336	afs_get_inode_cache(vnode);
5800db81 DH	337
1da177e4	338	/* success */
260a9803	339	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
08e0e7c8	340	inode->i_flags \|= S_NOATIME;
1da177e4	341	unlock_new_inode(inode);
08e0e7c8 DH	342	_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
08e0e7c8 DH	343	return inode;
1da177e4 LT	344
1da177e4 LT	345	/* failure */
ec26815a	346	bad_inode:
aa7fa240	347	iget_failed(inode);
1da177e4	348	_leave(" = %d [bad]", ret);
08e0e7c8	349	return ERR_PTR(ret);
ec26815a	350	}
1da177e4	351
416351f2 DH	352	/*
	353	* mark the data attached to an inode as obsolete due to a write on the server
	354	* - might also want to ditch all the outstanding writes and dirty pages
	355	*/
	356	void afs_zap_data(struct afs_vnode *vnode)
	357	{
3b6492df	358	_enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
416351f2	359
c1515999 DH	360	#ifdef CONFIG_AFS_FSCACHE
	361	fscache_invalidate(vnode->cache);
	362	#endif
	363
416351f2	364	/* nuke all the non-dirty pages that aren't locked, mapped or being
0f300ca9 DH	365	* written back in a regular file and completely discard the pages in a
	366	* directory or symlink */
	367	if (S_ISREG(vnode->vfs_inode.i_mode))
	368	invalidate_remote_inode(&vnode->vfs_inode);
	369	else
	370	invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
416351f2 DH	371	}
416351f2 DH	372
260a9803 DH	373	/*
	374	* validate a vnode/inode
	375	* - there are several things we need to check
	376	* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
	377	* symlink)
	378	* - parent dir metadata changed (security changes)
	379	* - dentry data changed (write, truncate)
	380	* - dentry metadata changed (security changes)
	381	*/
	382	int afs_validate(struct afs_vnode vnode, struct key key)
	383	{
c435ee34	384	time64_t now = ktime_get_real_seconds();
ae3b7361	385	bool valid;
260a9803 DH	386	int ret;
260a9803 DH	387
3b6492df	388	_enter("{v={%llx:%llu} fl=%lx},%x",
260a9803 DH	389	vnode->fid.vid, vnode->fid.vnode, vnode->flags,
	390	key_serial(key));
	391
c435ee34 DH	392	/* Quickly check the callback state. Ideally, we'd use read_seqbegin
	393	* here, but we have no way to pass the net namespace to the RCU
	394	* cleanup for the server record.
	395	*/
	396	read_seqlock_excl(&vnode->cb_lock);
	397
	398	if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
68251f0a DH	399	if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break \|\|
68251f0a DH	400	vnode->cb_v_break != vnode->volume->cb_v_break) {
c435ee34	401	vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
68251f0a DH	402	vnode->cb_v_break = vnode->volume->cb_v_break;
68251f0a DH	403	valid = false;
63a4681f	404	} else if (vnode->status.type == AFS_FTYPE_DIR &&
ae3b7361 DH	405	(!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) \|\|
	406	vnode->cb_expires_at - 10 <= now)) {
	407	valid = false;
	408	} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) \|\|
	409	vnode->cb_expires_at - 10 <= now) {
	410	valid = false;
	411	} else {
68251f0a	412	valid = true;
260a9803	413	}
c435ee34 DH	414	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
c435ee34 DH	415	valid = true;
ae3b7361 DH	416	} else {
	417	vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
	418	vnode->cb_v_break = vnode->volume->cb_v_break;
	419	valid = false;
260a9803 DH	420	}
260a9803 DH	421
c435ee34	422	read_sequnlock_excl(&vnode->cb_lock);
440fbc3a DH	423
	424	if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
	425	clear_nlink(&vnode->vfs_inode);
	426
c435ee34	427	if (valid)
260a9803 DH	428	goto valid;
260a9803 DH	429
b61f7dcf	430	down_write(&vnode->validate_lock);
260a9803 DH	431
	432	/* if the promise has expired, we need to check the server again to get
	433	* a new promise - note that if the (parent) directory's metadata was
	434	* changed then the security may be different and we may no longer have
	435	* access */
c435ee34	436	if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
260a9803	437	_debug("not promised");
0c3a5ac2	438	ret = afs_fetch_status(vnode, key, false);
c435ee34 DH	439	if (ret < 0) {
	440	if (ret == -ENOENT) {
	441	set_bit(AFS_VNODE_DELETED, &vnode->flags);
	442	ret = -ESTALE;
	443	}
260a9803	444	goto error_unlock;
c435ee34	445	}
260a9803 DH	446	_debug("new promise [fl=%lx]", vnode->flags);
	447	}
	448
	449	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
	450	_debug("file already deleted");
	451	ret = -ESTALE;
	452	goto error_unlock;
	453	}
	454
	455	/* if the vnode's data version number changed then its contents are
	456	* different */
416351f2 DH	457	if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
416351f2 DH	458	afs_zap_data(vnode);
b61f7dcf	459	up_write(&vnode->validate_lock);
260a9803 DH	460	valid:
	461	_leave(" = 0");
	462	return 0;
	463
	464	error_unlock:
b61f7dcf	465	up_write(&vnode->validate_lock);
260a9803 DH	466	_leave(" = %d", ret);
	467	return ret;
	468	}
	469
1da177e4 LT	470	/*
	471	* read the attributes of an inode
	472	*/
a528d35e DH	473	int afs_getattr(const struct path path, struct kstat stat,
a528d35e DH	474	u32 request_mask, unsigned int query_flags)
1da177e4	475	{
a528d35e	476	struct inode *inode = d_inode(path->dentry);
c435ee34 DH	477	struct afs_vnode *vnode = AFS_FS_I(inode);
c435ee34 DH	478	int seq = 0;
1da177e4	479
d6e43f75	480	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
1da177e4	481
c435ee34 DH	482	do {
	483	read_seqbegin_or_lock(&vnode->cb_lock, &seq);
	484	generic_fillattr(inode, stat);
	485	} while (need_seqretry(&vnode->cb_lock, seq));
	486
	487	done_seqretry(&vnode->cb_lock, seq);
1da177e4	488	return 0;
ec26815a	489	}
1da177e4	490
bec5eb61	491	/*
	492	* discard an AFS inode
	493	*/
	494	int afs_drop_inode(struct inode *inode)
	495	{
	496	_enter("");
	497
	498	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
	499	return generic_delete_inode(inode);
	500	else
	501	return generic_drop_inode(inode);
	502	}
	503
1da177e4 LT	504	/*
	505	* clear an AFS inode
	506	*/
b57922d9	507	void afs_evict_inode(struct inode *inode)
1da177e4 LT	508	{
	509	struct afs_vnode *vnode;
	510
	511	vnode = AFS_FS_I(inode);
	512
3b6492df	513	_enter("{%llx:%llu.%d}",
260a9803	514	vnode->fid.vid,
1da177e4	515	vnode->fid.vnode,
c435ee34	516	vnode->fid.unique);
1da177e4	517
08e0e7c8 DH	518	_debug("CLEAR INODE %p", inode);
	519
	520	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
	521
91b0abe3	522	truncate_inode_pages_final(&inode->i_data);
dbd5768f	523	clear_inode(inode);
b57922d9	524
c435ee34 DH	525	if (vnode->cb_interest) {
	526	afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
	527	vnode->cb_interest = NULL;
08e0e7c8	528	}
1da177e4	529
4343d008 DH	530	while (!list_empty(&vnode->wb_keys)) {
	531	struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
	532	struct afs_wb_key, vnode_link);
	533	list_del(&wbk->vnode_link);
	534	afs_put_wb_key(wbk);
	535	}
1da177e4	536
9b3f26c9	537	#ifdef CONFIG_AFS_FSCACHE
402cb8dd DH	538	{
	539	struct afs_vnode_cache_aux aux;
	540
	541	aux.data_version = vnode->status.data_version;
	542	fscache_relinquish_cookie(vnode->cache, &aux,
	543	test_bit(AFS_VNODE_DELETED, &vnode->flags));
	544	vnode->cache = NULL;
	545	}
1da177e4 LT	546	#endif
1da177e4 LT	547
fe342cf7	548	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
1da177e4	549	_leave("");
ec26815a	550	}
31143d5d DH	551
	552	/*
	553	* set the attributes of an inode
	554	*/
	555	int afs_setattr(struct dentry dentry, struct iattr attr)
	556	{
d2ddc776	557	struct afs_fs_cursor fc;
2b0143b5	558	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
31143d5d DH	559	struct key *key;
	560	int ret;
	561
3b6492df	562	_enter("{%llx:%llu},{n=%pd},%x",
a455589f	563	vnode->fid.vid, vnode->fid.vnode, dentry,
31143d5d DH	564	attr->ia_valid);
	565
	566	if (!(attr->ia_valid & (ATTR_SIZE \| ATTR_MODE \| ATTR_UID \| ATTR_GID \|
	567	ATTR_MTIME))) {
	568	_leave(" = 0 [unsupported]");
	569	return 0;
	570	}
	571
	572	/* flush any dirty data outstanding on a regular file */
4343d008	573	if (S_ISREG(vnode->vfs_inode.i_mode))
31143d5d	574	filemap_write_and_wait(vnode->vfs_inode.i_mapping);
31143d5d DH	575
31143d5d DH	576	if (attr->ia_valid & ATTR_FILE) {
215804a9	577	key = afs_file_key(attr->ia_file);
31143d5d DH	578	} else {
	579	key = afs_request_key(vnode->volume->cell);
	580	if (IS_ERR(key)) {
	581	ret = PTR_ERR(key);
	582	goto error;
	583	}
	584	}
	585
d2ddc776 DH	586	ret = -ERESTARTSYS;
	587	if (afs_begin_vnode_operation(&fc, vnode, key)) {
	588	while (afs_select_fileserver(&fc)) {
68251f0a	589	fc.cb_break = afs_calc_vnode_cb_break(vnode);
d2ddc776 DH	590	afs_fs_setattr(&fc, attr);
	591	}
	592
	593	afs_check_for_remote_deletion(&fc, fc.vnode);
	594	afs_vnode_commit_status(&fc, vnode, fc.cb_break);
	595	ret = afs_end_vnode_operation(&fc);
	596	}
	597
31143d5d DH	598	if (!(attr->ia_valid & ATTR_FILE))
	599	key_put(key);
	600
	601	error:
	602	_leave(" = %d", ret);
	603	return ret;
	604	}