1 // SPDX-License-Identifier: GPL-2.0-or-later
30 	struct afs_super_info *as = AFS_FS_S(inode->i_sb);  in afs_iget5_pseudo_set()
34 	vnode->volume		= as->volume;  in afs_iget5_pseudo_set()
35 	vnode->fid		= *fid;  in afs_iget5_pseudo_set()
36 	inode->i_ino		= fid->vnode;  in afs_iget5_pseudo_set()
37 	inode->i_generation	= fid->unique;  in afs_iget5_pseudo_set()
54 	if (as->volume)  in afs_iget_pseudo_dir()
55 		fid.vid = as->volume->vid;  in afs_iget_pseudo_dir()
67 		_leave(" = -ENOMEM");  in afs_iget_pseudo_dir()
68 		return ERR_PTR(-ENOMEM);  in afs_iget_pseudo_dir()
72 	       inode, inode->i_ino, fid.vid, fid.vnode, fid.unique);  in afs_iget_pseudo_dir()
77 	BUG_ON(!(inode->i_state & I_NEW));  in afs_iget_pseudo_dir()
79 	netfs_inode_init(&vnode->netfs, NULL, false);  in afs_iget_pseudo_dir()
80 	inode->i_size		= 0;  in afs_iget_pseudo_dir()
81 	inode->i_mode		= S_IFDIR | S_IRUGO | S_IXUGO;  in afs_iget_pseudo_dir()
83 		inode->i_op	= &afs_dynroot_inode_operations;  in afs_iget_pseudo_dir()
84 		inode->i_fop	= &simple_dir_operations;  in afs_iget_pseudo_dir()
86 		inode->i_op	= &afs_autocell_inode_operations;  in afs_iget_pseudo_dir()
88 	set_nlink(inode, 2);  in afs_iget_pseudo_dir()
89 	inode->i_uid		= GLOBAL_ROOT_UID;  in afs_iget_pseudo_dir()
90 	inode->i_gid		= GLOBAL_ROOT_GID;  in afs_iget_pseudo_dir()
92 	inode->i_blocks		= 0;  in afs_iget_pseudo_dir()
93 	inode->i_generation	= 0;  in afs_iget_pseudo_dir()
95 	set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);  in afs_iget_pseudo_dir()
97 		set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);  in afs_iget_pseudo_dir()
98 		inode->i_flags |= S_AUTOMOUNT;  in afs_iget_pseudo_dir()
101 	inode->i_flags |= S_NOATIME;  in afs_iget_pseudo_dir()
108  * Probe to see if a cell may exist.  This prevents positive dentries from
113 	struct afs_cell *cell;  in afs_probe_cell_name()  local
115 	const char *name = dentry->d_name.name;  in afs_probe_cell_name()
116 	size_t len = dentry->d_name.len;  in afs_probe_cell_name()
123 			return -EINVAL;  in afs_probe_cell_name()
125 		len--;  in afs_probe_cell_name()
128 	cell = afs_find_cell(net, name, len, afs_cell_trace_use_probe);  in afs_probe_cell_name()
129 	if (!IS_ERR(cell)) {  in afs_probe_cell_name()
130 		afs_unuse_cell(net, cell, afs_cell_trace_unuse_probe);  in afs_probe_cell_name()
134 	ret = dns_query(net->net, "afsdb", name, len, "srv=1",  in afs_probe_cell_name()
136 	if (ret == -ENODATA || ret == -ENOKEY || ret == 0)  in afs_probe_cell_name()
137 		ret = -ENOENT;  in afs_probe_cell_name()
141 		if (v1->hdr.zero == 0 &&  in afs_probe_cell_name()
142 		    v1->hdr.content == DNS_PAYLOAD_IS_SERVER_LIST &&  in afs_probe_cell_name()
143 		    v1->hdr.version == 1 &&  in afs_probe_cell_name()
144 		    (v1->status != DNS_LOOKUP_GOOD &&  in afs_probe_cell_name()
145 		     v1->status != DNS_LOOKUP_GOOD_WITH_BAD))  in afs_probe_cell_name()
146 			return -ENOENT;  in afs_probe_cell_name()
162 	int ret = -ENOENT;  in afs_try_auto_mntpt()
165 	       dentry, dentry, vnode->fid.vid, vnode->fid.vnode);  in afs_try_auto_mntpt()
167 	if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))  in afs_try_auto_mntpt()
174 	inode = afs_iget_pseudo_dir(dir->i_sb, false);  in afs_try_auto_mntpt()
185 	return ret == -ENOENT ? NULL : ERR_PTR(ret);  in afs_try_auto_mntpt()
199 		return ERR_PTR(-EOPNOTSUPP);  in afs_dynroot_lookup()
201 	if (dentry->d_name.len >= AFSNAMEMAX) {  in afs_dynroot_lookup()
202 		_leave(" = -ENAMETOOLONG");  in afs_dynroot_lookup()
203 		return ERR_PTR(-ENAMETOOLONG);  in afs_dynroot_lookup()
220  * Create a manually added cell mount directory.
221  * - The caller must hold net->proc_cells_lock
223 int afs_dynroot_mkdir(struct afs_net *net, struct afs_cell *cell)  in afs_dynroot_mkdir()  argument
225 	struct super_block *sb = net->dynroot_sb;  in afs_dynroot_mkdir()
227 	char *dotname = cell->name - 1;  in afs_dynroot_mkdir()
230 	if (!sb || atomic_read(&sb->s_active) == 0)  in afs_dynroot_mkdir()
233 	/* Let the ->lookup op do the creation */  in afs_dynroot_mkdir()
234 	root = sb->s_root;  in afs_dynroot_mkdir()
235 	inode_lock(root->d_inode);  in afs_dynroot_mkdir()
236 	subdir = lookup_one_len(cell->name, root, cell->name_len);  in afs_dynroot_mkdir()
242 	dsubdir = lookup_one_len(dotname, root, cell->name_len + 1);  in afs_dynroot_mkdir()
250 	subdir->d_fsdata = (void *)1UL;  in afs_dynroot_mkdir()
251 	dsubdir->d_fsdata = (void *)1UL;  in afs_dynroot_mkdir()
254 	inode_unlock(root->d_inode);  in afs_dynroot_mkdir()
262 	/* Don't want to trigger a lookup call, which will re-add the cell */  in afs_dynroot_rm_one_dir()
271 	if (subdir->d_fsdata) {  in afs_dynroot_rm_one_dir()
273 		subdir->d_fsdata = NULL;  in afs_dynroot_rm_one_dir()
280  * Remove a manually added cell mount directory.
281  * - The caller must hold net->proc_cells_lock
283 void afs_dynroot_rmdir(struct afs_net *net, struct afs_cell *cell)  in afs_dynroot_rmdir()  argument
285 	struct super_block *sb = net->dynroot_sb;  in afs_dynroot_rmdir()
286 	char *dotname = cell->name - 1;  in afs_dynroot_rmdir()
288 	if (!sb || atomic_read(&sb->s_active) == 0)  in afs_dynroot_rmdir()
291 	inode_lock(sb->s_root->d_inode);  in afs_dynroot_rmdir()
292 	afs_dynroot_rm_one_dir(sb->s_root, cell->name, cell->name_len);  in afs_dynroot_rmdir()
293 	afs_dynroot_rm_one_dir(sb->s_root, dotname, cell->name_len + 1);  in afs_dynroot_rmdir()
294 	inode_unlock(sb->s_root->d_inode);  in afs_dynroot_rmdir()
300 	struct afs_cell *cell = arg;  in afs_atcell_delayed_put_cell()  local
302 	afs_put_cell(cell, afs_cell_trace_put_atcell);  in afs_atcell_delayed_put_cell()
306  * Read @cell or .@cell symlinks.
312 	struct afs_cell *cell;  in afs_atcell_get_link()  local
315 	bool dotted = vnode->fid.vnode == 3;  in afs_atcell_get_link()
317 	if (!rcu_access_pointer(net->ws_cell))  in afs_atcell_get_link()
318 		return ERR_PTR(-ENOENT);  in afs_atcell_get_link()
321 		/* We're in RCU-pathwalk. */  in afs_atcell_get_link()
322 		cell = rcu_dereference(net->ws_cell);  in afs_atcell_get_link()
324 			name = cell->name - 1;  in afs_atcell_get_link()
326 			name = cell->name;  in afs_atcell_get_link()
331 	down_read(&net->cells_lock);  in afs_atcell_get_link()
333 	cell = rcu_dereference_protected(net->ws_cell, lockdep_is_held(&net->cells_lock));  in afs_atcell_get_link()
335 		name = cell->name - 1;  in afs_atcell_get_link()
337 		name = cell->name;  in afs_atcell_get_link()
338 	afs_get_cell(cell, afs_cell_trace_get_atcell);  in afs_atcell_get_link()
339 	set_delayed_call(done, afs_atcell_delayed_put_cell, cell);  in afs_atcell_get_link()
341 	up_read(&net->cells_lock);  in afs_atcell_get_link()
350  * Look up @cell or .@cell in a dynroot directory.  This is a substitution for
351  * the local cell name for the net namespace.
356 	struct afs_fid fid = { .vnode = 2, .unique = 1, };  in afs_dynroot_create_symlink()
365 		return ERR_PTR(-ENOMEM);  in afs_dynroot_create_symlink()
367 	inode = iget5_locked(dentry->d_sb, fid.vnode,  in afs_dynroot_create_symlink()
371 		return ERR_PTR(-ENOMEM);  in afs_dynroot_create_symlink()
377 	if (WARN_ON_ONCE(!(inode->i_state & I_NEW))) {  in afs_dynroot_create_symlink()
380 		return ERR_PTR(-EIO);  in afs_dynroot_create_symlink()
383 	netfs_inode_init(&vnode->netfs, NULL, false);  in afs_dynroot_create_symlink()
386 	inode->i_size		= 0;  in afs_dynroot_create_symlink()
387 	inode->i_mode		= S_IFLNK | 0555;  in afs_dynroot_create_symlink()
388 	inode->i_op		= &afs_atcell_inode_operations;  in afs_dynroot_create_symlink()
389 	inode->i_uid		= GLOBAL_ROOT_UID;  in afs_dynroot_create_symlink()
390 	inode->i_gid		= GLOBAL_ROOT_GID;  in afs_dynroot_create_symlink()
391 	inode->i_blocks		= 0;  in afs_dynroot_create_symlink()
392 	inode->i_generation	= 0;  in afs_dynroot_create_symlink()
393 	inode->i_flags		|= S_NOATIME;  in afs_dynroot_create_symlink()
401  * Create @cell and .@cell symlinks.
405 	struct super_block *sb = net->dynroot_sb;  in afs_dynroot_symlink()
409 	/* Let the ->lookup op do the creation */  in afs_dynroot_symlink()
410 	root = sb->s_root;  in afs_dynroot_symlink()
411 	inode_lock(root->d_inode);  in afs_dynroot_symlink()
412 	symlink = afs_dynroot_create_symlink(root, "@cell");  in afs_dynroot_symlink()
418 	dsymlink = afs_dynroot_create_symlink(root, ".@cell");  in afs_dynroot_symlink()
426 	symlink->d_fsdata = (void *)1UL;  in afs_dynroot_symlink()
427 	dsymlink->d_fsdata = (void *)1UL;  in afs_dynroot_symlink()
430 	inode_unlock(root->d_inode);  in afs_dynroot_symlink()
435  * Populate a newly created dynamic root with cell names.
439 	struct afs_cell *cell;  in afs_dynroot_populate()  local
443 	mutex_lock(&net->proc_cells_lock);  in afs_dynroot_populate()
445 	net->dynroot_sb = sb;  in afs_dynroot_populate()
450 	hlist_for_each_entry(cell, &net->proc_cells, proc_link) {  in afs_dynroot_populate()
451 		ret = afs_dynroot_mkdir(net, cell);  in afs_dynroot_populate()
458 	mutex_unlock(&net->proc_cells_lock);  in afs_dynroot_populate()
462 	net->dynroot_sb = NULL;  in afs_dynroot_populate()
473 	struct dentry *root = sb->s_root, *subdir;  in afs_dynroot_depopulate()
476 	mutex_lock(&net->proc_cells_lock);  in afs_dynroot_depopulate()
477 	if (net->dynroot_sb == sb)  in afs_dynroot_depopulate()
478 		net->dynroot_sb = NULL;  in afs_dynroot_depopulate()
479 	mutex_unlock(&net->proc_cells_lock);  in afs_dynroot_depopulate()
483 		inode_lock(root->d_inode);  in afs_dynroot_depopulate()
486 		hlist_for_each_entry_safe(subdir, n, &root->d_children, d_sib) {  in afs_dynroot_depopulate()
487 			if (subdir->d_fsdata) {  in afs_dynroot_depopulate()
488 				subdir->d_fsdata = NULL;  in afs_dynroot_depopulate()
493 		inode_unlock(root->d_inode);  in afs_dynroot_depopulate()