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()
57 		fid.vnode = 1;  in afs_iget_pseudo_dir()
58 		fid.unique = 1;  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()
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()
122 		if (len == 1)  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()
189  * Look up @cell in a dynroot directory.  This is a substitution for the
190  * local cell name for the net namespace.
194 	struct afs_cell *cell;  in afs_lookup_atcell()  local
200 	if (!net->ws_cell)  in afs_lookup_atcell()
201 		return ERR_PTR(-ENOENT);  in afs_lookup_atcell()
203 	ret = ERR_PTR(-ENOMEM);  in afs_lookup_atcell()
204 	name = kmalloc(AFS_MAXCELLNAME + 1, GFP_KERNEL);  in afs_lookup_atcell()
208 	down_read(&net->cells_lock);  in afs_lookup_atcell()
209 	cell = net->ws_cell;  in afs_lookup_atcell()
210 	if (cell) {  in afs_lookup_atcell()
211 		len = cell->name_len;  in afs_lookup_atcell()
212 		memcpy(name, cell->name, len + 1);  in afs_lookup_atcell()
214 	up_read(&net->cells_lock);  in afs_lookup_atcell()
216 	ret = ERR_PTR(-ENOENT);  in afs_lookup_atcell()
217 	if (!cell)  in afs_lookup_atcell()
220 	ret = lookup_one_len(name, dentry->d_parent, len);  in afs_lookup_atcell()
222 	/* We don't want to d_add() the @cell dentry here as we don't want to  in afs_lookup_atcell()
223 	 * the cached dentry to hide changes to the local cell name.  in afs_lookup_atcell()
243 		return ERR_PTR(-EOPNOTSUPP);  in afs_dynroot_lookup()
245 	if (dentry->d_name.len >= AFSNAMEMAX) {  in afs_dynroot_lookup()
246 		_leave(" = -ENAMETOOLONG");  in afs_dynroot_lookup()
247 		return ERR_PTR(-ENAMETOOLONG);  in afs_dynroot_lookup()
250 	if (dentry->d_name.len == 5 &&  in afs_dynroot_lookup()
251 	    memcmp(dentry->d_name.name, "@cell", 5) == 0)  in afs_dynroot_lookup()
268  * Create a manually added cell mount directory.
269  * - The caller must hold net->proc_cells_lock
271 int afs_dynroot_mkdir(struct afs_net *net, struct afs_cell *cell)  in afs_dynroot_mkdir()  argument
273 	struct super_block *sb = net->dynroot_sb;  in afs_dynroot_mkdir()
277 	if (!sb || atomic_read(&sb->s_active) == 0)  in afs_dynroot_mkdir()
280 	/* Let the ->lookup op do the creation */  in afs_dynroot_mkdir()
281 	root = sb->s_root;  in afs_dynroot_mkdir()
282 	inode_lock(root->d_inode);  in afs_dynroot_mkdir()
283 	subdir = lookup_one_len(cell->name, root, cell->name_len);  in afs_dynroot_mkdir()
290 	subdir->d_fsdata = (void *)1UL;  in afs_dynroot_mkdir()
293 	inode_unlock(root->d_inode);  in afs_dynroot_mkdir()
298  * Remove a manually added cell mount directory.
299  * - The caller must hold net->proc_cells_lock
301 void afs_dynroot_rmdir(struct afs_net *net, struct afs_cell *cell)  in afs_dynroot_rmdir()  argument
303 	struct super_block *sb = net->dynroot_sb;  in afs_dynroot_rmdir()
306 	if (!sb || atomic_read(&sb->s_active) == 0)  in afs_dynroot_rmdir()
309 	root = sb->s_root;  in afs_dynroot_rmdir()
310 	inode_lock(root->d_inode);  in afs_dynroot_rmdir()
312 	/* Don't want to trigger a lookup call, which will re-add the cell */  in afs_dynroot_rmdir()
313 	subdir = try_lookup_one_len(cell->name, root, cell->name_len);  in afs_dynroot_rmdir()
321 	if (subdir->d_fsdata) {  in afs_dynroot_rmdir()
323 		subdir->d_fsdata = NULL;  in afs_dynroot_rmdir()
328 	inode_unlock(root->d_inode);  in afs_dynroot_rmdir()
333  * Populate a newly created dynamic root with cell names.
337 	struct afs_cell *cell;  in afs_dynroot_populate()  local
341 	mutex_lock(&net->proc_cells_lock);  in afs_dynroot_populate()
343 	net->dynroot_sb = sb;  in afs_dynroot_populate()
344 	hlist_for_each_entry(cell, &net->proc_cells, proc_link) {  in afs_dynroot_populate()
345 		ret = afs_dynroot_mkdir(net, cell);  in afs_dynroot_populate()
352 	mutex_unlock(&net->proc_cells_lock);  in afs_dynroot_populate()
356 	net->dynroot_sb = NULL;  in afs_dynroot_populate()
367 	struct dentry *root = sb->s_root, *subdir;  in afs_dynroot_depopulate()
370 	mutex_lock(&net->proc_cells_lock);  in afs_dynroot_depopulate()
371 	if (net->dynroot_sb == sb)  in afs_dynroot_depopulate()
372 		net->dynroot_sb = NULL;  in afs_dynroot_depopulate()
373 	mutex_unlock(&net->proc_cells_lock);  in afs_dynroot_depopulate()
377 		inode_lock(root->d_inode);  in afs_dynroot_depopulate()
380 		hlist_for_each_entry_safe(subdir, n, &root->d_children, d_sib) {  in afs_dynroot_depopulate()
381 			if (subdir->d_fsdata) {  in afs_dynroot_depopulate()
382 				subdir->d_fsdata = NULL;  in afs_dynroot_depopulate()
387 		inode_unlock(root->d_inode);  in afs_dynroot_depopulate()