1 // SPDX-License-Identifier: GPL-2.0-only
30 	const struct export_operations *nop = dir->d_sb->s_export_op;  in exportfs_get_name()
33 	if (nop->get_name)  in exportfs_get_name()
34 		return nop->get_name(dir, name, child);  in exportfs_get_name()
53 	inode = result->d_inode;  in find_acceptable_alias()
54 	spin_lock(&inode->i_lock);  in find_acceptable_alias()
55 	hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {  in find_acceptable_alias()
57 		spin_unlock(&inode->i_lock);  in find_acceptable_alias()
64 		spin_lock(&inode->i_lock);  in find_acceptable_alias()
67 	spin_unlock(&inode->i_lock);  in find_acceptable_alias()
77 	while (dentry->d_flags & DCACHE_DISCONNECTED) {  in dentry_connected()
94 	while (dentry->d_flags & DCACHE_DISCONNECTED) {  in clear_disconnected()
99 		spin_lock(&dentry->d_lock);  in clear_disconnected()
100 		dentry->d_flags &= ~DCACHE_DISCONNECTED;  in clear_disconnected()
101 		spin_unlock(&dentry->d_lock);  in clear_disconnected()
128 	parent = ERR_PTR(-EACCES);  in reconnect_one()
129 	inode_lock(dentry->d_inode);  in reconnect_one()
130 	if (mnt->mnt_sb->s_export_op->get_parent)  in reconnect_one()
131 		parent = mnt->mnt_sb->s_export_op->get_parent(dentry);  in reconnect_one()
132 	inode_unlock(dentry->d_inode);  in reconnect_one()
136 			dentry->d_inode->i_ino, PTR_ERR(parent));  in reconnect_one()
141 		dentry->d_inode->i_ino, parent->d_inode->i_ino);  in reconnect_one()
143 	if (err == -ENOENT)  in reconnect_one()
158 		 * got looked up and thus connected, and it would  in reconnect_one()
159 		 * remain connected afterwards.  We are done.  in reconnect_one()
166 		err = -ESTALE;  in reconnect_one()
187 	 * double check that this worked and return -ESTALE if not:  in reconnect_one()
190 		return ERR_PTR(-ESTALE);  in reconnect_one()
195  * Make sure target_dir is fully connected to the dentry tree.
198  * target_dir, and target_dir->d_parent->...->d_parent will reach the
201  * Whenever DCACHE_DISCONNECTED is unset, target_dir is fully connected.
203  * set but already be connected.  In that case we'll verify the
208  * connected, but further operations using the filehandle will fail when
218 	while (dentry->d_flags & DCACHE_DISCONNECTED) {  in reconnect_path()
219 		BUG_ON(dentry == mnt->mnt_sb->s_root);  in reconnect_path()
257 	buf->sequence++;  in filldir_one()
258 	if (buf->ino == ino && len <= NAME_MAX) {  in filldir_one()
259 		memcpy(buf->name, name, len);  in filldir_one()
260 		buf->name[len] = '\0';  in filldir_one()
261 		buf->found = 1;  in filldir_one()
268  * get_name - default export_operations->get_name function
279 	struct inode *dir = path->dentry->d_inode;  in get_name()
284 		.mnt = path->mnt,  in get_name()
292 	error = -ENOTDIR;  in get_name()
293 	if (!dir || !S_ISDIR(dir->i_mode))  in get_name()
295 	error = -EINVAL;  in get_name()
296 	if (!dir->i_fop)  in get_name()
299 	 * inode->i_ino is unsigned long, kstat->ino is u64, so the  in get_name()
300 	 * former would be insufficient on 32-bit hosts when the  in get_name()
301 	 * filesystem supports 64-bit inode numbers.  So we need to  in get_name()
302 	 * actually call ->getattr, not just read i_ino:  in get_name()
317 	error = -EINVAL;  in get_name()
318 	if (!file->f_op->iterate_shared)  in get_name()
334 		error = -ENOENT;  in get_name()
346  * export_encode_fh - default export_operations->encode_fh function
372 	fid->i32.ino = inode->i_ino;  in export_encode_fh()
373 	fid->i32.gen = inode->i_generation;  in export_encode_fh()
375 		fid->i32.parent_ino = parent->i_ino;  in export_encode_fh()
376 		fid->i32.parent_gen = parent->i_generation;  in export_encode_fh()
385  * exportfs_encode_inode_fh - encode a file handle from inode
397 	const struct export_operations *nop = inode->i_sb->s_export_op;  in exportfs_encode_inode_fh()
403 	if (nop && !(flags & EXPORT_FH_FID) && !nop->fh_to_dentry)  in exportfs_encode_inode_fh()
404 		return -EOPNOTSUPP;  in exportfs_encode_inode_fh()
406 	if (nop && nop->encode_fh)  in exportfs_encode_inode_fh()
407 		return nop->encode_fh(inode, fid->raw, max_len, parent);  in exportfs_encode_inode_fh()
414  * exportfs_encode_fh - encode a file handle from dentry
427 	struct inode *inode = dentry->d_inode, *parent = NULL;  in exportfs_encode_fh()
429 	if ((flags & EXPORT_FH_CONNECTABLE) && !S_ISDIR(inode->i_mode)) {  in exportfs_encode_fh()
433 		 * it's still pinned by and still positive.  in exportfs_encode_fh()
435 		parent = p->d_inode;  in exportfs_encode_fh()
451 	const struct export_operations *nop = mnt->mnt_sb->s_export_op;  in exportfs_decode_fh_raw()
459 	if (!nop || !nop->fh_to_dentry)  in exportfs_decode_fh_raw()
460 		return ERR_PTR(-ESTALE);  in exportfs_decode_fh_raw()
461 	result = nop->fh_to_dentry(mnt->mnt_sb, fid, fh_len, fileid_type);  in exportfs_decode_fh_raw()
478 		 * On the positive side there is only one dentry for each  in exportfs_decode_fh_raw()
480 		 * to ensure our dentry is connected all the way up to the  in exportfs_decode_fh_raw()
483 		if (result->d_flags & DCACHE_DISCONNECTED) {  in exportfs_decode_fh_raw()
490 			err = -EACCES;  in exportfs_decode_fh_raw()
508 		 * it's connected to the filesystem root.  in exportfs_decode_fh_raw()
518 		err = -ESTALE;  in exportfs_decode_fh_raw()
519 		if (!nop->fh_to_parent)  in exportfs_decode_fh_raw()
522 		target_dir = nop->fh_to_parent(mnt->mnt_sb, fid,  in exportfs_decode_fh_raw()
532 		 * connected to the filesystem root.  The VFS really doesn't  in exportfs_decode_fh_raw()
542 		 * Now that we've got both a well-connected parent and a  in exportfs_decode_fh_raw()
544 		 * inode is actually connected to the parent.  in exportfs_decode_fh_raw()
552 		inode_lock(target_dir->d_inode);  in exportfs_decode_fh_raw()
556 			if (unlikely(nresult->d_inode != result->d_inode)) {  in exportfs_decode_fh_raw()
558 				nresult = ERR_PTR(-ESTALE);  in exportfs_decode_fh_raw()
561 		inode_unlock(target_dir->d_inode);  in exportfs_decode_fh_raw()
581 			err = -EACCES;  in exportfs_decode_fh_raw()
604 		if (ret == ERR_PTR(-ENOMEM))  in exportfs_decode_fh()
606 		return ERR_PTR(-ESTALE);  in exportfs_decode_fh()