19 static int ovl_encode_maybe_copy_up(struct dentry *dentry)  in ovl_encode_maybe_copy_up()  argument
23 	if (ovl_dentry_upper(dentry))  in ovl_encode_maybe_copy_up()
26 	err = ovl_want_write(dentry);  in ovl_encode_maybe_copy_up()
28 		err = ovl_copy_up(dentry);  in ovl_encode_maybe_copy_up()
29 		ovl_drop_write(dentry);  in ovl_encode_maybe_copy_up()
34 				    dentry, err);  in ovl_encode_maybe_copy_up()
77 static int ovl_connectable_layer(struct dentry *dentry)  in ovl_connectable_layer()  argument
79 	struct ovl_entry *oe = OVL_E(dentry);  in ovl_connectable_layer()
82 	if (dentry == dentry->d_sb->s_root)  in ovl_connectable_layer()
89 	if (ovl_dentry_upper(dentry) &&  in ovl_connectable_layer()
90 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_connectable_layer()
105 static int ovl_connect_layer(struct dentry *dentry)  in ovl_connect_layer()  argument
107 	struct dentry *next, *parent = NULL;  in ovl_connect_layer()
111 	if (WARN_ON(dentry == dentry->d_sb->s_root) ||  in ovl_connect_layer()
112 	    WARN_ON(!ovl_dentry_lower(dentry)))  in ovl_connect_layer()
115 	origin_layer = OVL_E(dentry)->lowerstack[0].layer->idx;  in ovl_connect_layer()
116 	if (ovl_dentry_test_flag(OVL_E_CONNECTED, dentry))  in ovl_connect_layer()
120 	next = dget(dentry);  in ovl_connect_layer()
150 		ovl_dentry_set_flag(OVL_E_CONNECTED, dentry);  in ovl_connect_layer()
183 static int ovl_check_encode_origin(struct dentry *dentry)  in ovl_check_encode_origin()  argument
185 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_check_encode_origin()
188 	if (!ovl_dentry_lower(dentry))  in ovl_check_encode_origin()
197 	if (ovl_dentry_upper(dentry) &&  in ovl_check_encode_origin()
198 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_check_encode_origin()
207 	if (d_is_dir(dentry) && ofs->upper_mnt)  in ovl_check_encode_origin()
208 		return ovl_connect_layer(dentry);  in ovl_check_encode_origin()
214 static int ovl_d_to_fh(struct dentry *dentry, char *buf, int buflen)  in ovl_d_to_fh()  argument
223 	err = enc_lower = ovl_check_encode_origin(dentry);  in ovl_d_to_fh()
228 	fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :  in ovl_d_to_fh()
229 				ovl_dentry_upper(dentry), !enc_lower);  in ovl_d_to_fh()
246 			    dentry, err, buflen, fh ? (int)fh->len : 0,  in ovl_d_to_fh()
251 static int ovl_dentry_to_fh(struct dentry *dentry, u32 *fid, int *max_len)  in ovl_dentry_to_fh()  argument
255 	res = ovl_d_to_fh(dentry, (char *)fid, len);  in ovl_dentry_to_fh()
269 	struct dentry *dentry;  in ovl_encode_fh()  local
276 	dentry = d_find_any_alias(inode);  in ovl_encode_fh()
277 	if (WARN_ON(!dentry))  in ovl_encode_fh()
280 	type = ovl_dentry_to_fh(dentry, fid, max_len);  in ovl_encode_fh()
282 	dput(dentry);  in ovl_encode_fh()
289 static struct dentry *ovl_obtain_alias(struct super_block *sb,  in ovl_obtain_alias()
290 				       struct dentry *upper_alias,  in ovl_obtain_alias()
292 				       struct dentry *index)  in ovl_obtain_alias()
294 	struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;  in ovl_obtain_alias()
295 	struct dentry *upper = upper_alias ?: index;  in ovl_obtain_alias()
296 	struct dentry *dentry;  in ovl_obtain_alias()  local
319 	dentry = d_find_any_alias(inode);  in ovl_obtain_alias()
320 	if (!dentry) {  in ovl_obtain_alias()
321 		dentry = d_alloc_anon(inode->i_sb);  in ovl_obtain_alias()
322 		if (!dentry)  in ovl_obtain_alias()
329 			oe->lowerstack->dentry = dget(lower);  in ovl_obtain_alias()
332 		dentry->d_fsdata = oe;  in ovl_obtain_alias()
334 			ovl_dentry_set_upper_alias(dentry);  in ovl_obtain_alias()
337 	return d_instantiate_anon(dentry, inode);  in ovl_obtain_alias()
341 	dput(dentry);  in ovl_obtain_alias()
346 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)  in ovl_dentry_real_at()  argument
348 	struct ovl_entry *oe = dentry->d_fsdata;  in ovl_dentry_real_at()
352 		return ovl_dentry_upper(dentry);  in ovl_dentry_real_at()
356 			return oe->lowerstack[i].dentry;  in ovl_dentry_real_at()
368 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()
369 					  struct dentry *real,  in ovl_lookup_real_one()
373 	struct dentry *this, *parent = NULL;  in ovl_lookup_real_one()
424 static struct dentry *ovl_lookup_real(struct super_block *sb,
425 				      struct dentry *real,
431 static struct dentry *ovl_lookup_real_inode(struct super_block *sb,  in ovl_lookup_real_inode()
432 					    struct dentry *real,  in ovl_lookup_real_inode()
437 	struct dentry *index = NULL;  in ovl_lookup_real_inode()
438 	struct dentry *this = NULL;  in ovl_lookup_real_inode()
465 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lookup_real_inode()
497 static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,  in ovl_lookup_real_ancestor()
498 					       struct dentry *real,  in ovl_lookup_real_ancestor()
501 	struct dentry *next, *parent = NULL;  in ovl_lookup_real_ancestor()
502 	struct dentry *ancestor = ERR_PTR(-EIO);  in ovl_lookup_real_ancestor()
550 static struct dentry *ovl_lookup_real(struct super_block *sb,  in ovl_lookup_real()
551 				      struct dentry *real,  in ovl_lookup_real()
554 	struct dentry *connected;  in ovl_lookup_real()
562 		struct dentry *next, *this;  in ovl_lookup_real()
563 		struct dentry *parent = NULL;  in ovl_lookup_real()
564 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
652 static struct dentry *ovl_get_dentry(struct super_block *sb,  in ovl_get_dentry()
653 				     struct dentry *upper,  in ovl_get_dentry()
655 				     struct dentry *index)  in ovl_get_dentry()
660 	struct dentry *real = upper ?: (index ?: lowerpath->dentry);  in ovl_get_dentry()
680 static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,  in ovl_upper_fh_to_d()
684 	struct dentry *dentry;  in ovl_upper_fh_to_d()  local
685 	struct dentry *upper;  in ovl_upper_fh_to_d()
694 	dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_upper_fh_to_d()
697 	return dentry;  in ovl_upper_fh_to_d()
700 static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,  in ovl_lower_fh_to_d()
706 	struct dentry *dentry = NULL;  in ovl_lower_fh_to_d()  local
707 	struct dentry *index = NULL;  in ovl_lower_fh_to_d()
716 	if (!d_is_dir(origin.dentry) ||  in ovl_lower_fh_to_d()
717 	    !(origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
718 		inode = ovl_lookup_inode(sb, origin.dentry, false);  in ovl_lower_fh_to_d()
723 			dentry = d_find_any_alias(inode);  in ovl_lower_fh_to_d()
725 			if (dentry)  in ovl_lower_fh_to_d()
742 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lower_fh_to_d()
748 		dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_lower_fh_to_d()
754 	if (d_is_dir(origin.dentry)) {  in ovl_lower_fh_to_d()
755 		dput(origin.dentry);  in ovl_lower_fh_to_d()
756 		origin.dentry = NULL;  in ovl_lower_fh_to_d()
762 		err = ovl_verify_origin(index, origin.dentry, false);  in ovl_lower_fh_to_d()
768 	dentry = ovl_get_dentry(sb, NULL, &origin, index);  in ovl_lower_fh_to_d()
771 	dput(origin.dentry);  in ovl_lower_fh_to_d()
773 	return dentry;  in ovl_lower_fh_to_d()
776 	dentry = ERR_PTR(err);  in ovl_lower_fh_to_d()
780 static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,  in ovl_fh_to_dentry()
783 	struct dentry *dentry = NULL;  in ovl_fh_to_dentry()  local
798 	dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?  in ovl_fh_to_dentry()
801 	err = PTR_ERR(dentry);  in ovl_fh_to_dentry()
802 	if (IS_ERR(dentry) && err != -ESTALE)  in ovl_fh_to_dentry()
805 	return dentry;  in ovl_fh_to_dentry()
813 static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,  in ovl_fh_to_parent()
820 static int ovl_get_name(struct dentry *parent, char *name,  in ovl_get_name()
821 			struct dentry *child)  in ovl_get_name()
831 static struct dentry *ovl_get_parent(struct dentry *dentry)  in ovl_get_parent()  argument