22 static int ovl_encode_maybe_copy_up(struct dentry *dentry)  in ovl_encode_maybe_copy_up()  argument
26 	if (ovl_dentry_upper(dentry))  in ovl_encode_maybe_copy_up()
29 	err = ovl_want_write(dentry);  in ovl_encode_maybe_copy_up()
31 		err = ovl_copy_up(dentry);  in ovl_encode_maybe_copy_up()
32 		ovl_drop_write(dentry);  in ovl_encode_maybe_copy_up()
37 				    dentry, err);  in ovl_encode_maybe_copy_up()
80 static int ovl_connectable_layer(struct dentry *dentry)  in ovl_connectable_layer()  argument
82 	struct ovl_entry *oe = OVL_E(dentry);  in ovl_connectable_layer()
85 	if (dentry == dentry->d_sb->s_root)  in ovl_connectable_layer()
92 	if (ovl_dentry_upper(dentry) &&  in ovl_connectable_layer()
93 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_connectable_layer()
108 static int ovl_connect_layer(struct dentry *dentry)  in ovl_connect_layer()  argument
110 	struct dentry *next, *parent = NULL;  in ovl_connect_layer()
114 	if (WARN_ON(dentry == dentry->d_sb->s_root) ||  in ovl_connect_layer()
115 	    WARN_ON(!ovl_dentry_lower(dentry)))  in ovl_connect_layer()
118 	origin_layer = OVL_E(dentry)->lowerstack[0].layer->idx;  in ovl_connect_layer()
119 	if (ovl_dentry_test_flag(OVL_E_CONNECTED, dentry))  in ovl_connect_layer()
123 	next = dget(dentry);  in ovl_connect_layer()
153 		ovl_dentry_set_flag(OVL_E_CONNECTED, dentry);  in ovl_connect_layer()
186 static int ovl_check_encode_origin(struct dentry *dentry)  in ovl_check_encode_origin()  argument
188 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_check_encode_origin()
191 	if (!ovl_dentry_lower(dentry))  in ovl_check_encode_origin()
200 	if (ovl_dentry_upper(dentry) &&  in ovl_check_encode_origin()
201 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_check_encode_origin()
210 	if (d_is_dir(dentry) && ofs->upper_mnt)  in ovl_check_encode_origin()
211 		return ovl_connect_layer(dentry);  in ovl_check_encode_origin()
217 static int ovl_d_to_fh(struct dentry *dentry, char *buf, int buflen)  in ovl_d_to_fh()  argument
226 	err = enc_lower = ovl_check_encode_origin(dentry);  in ovl_d_to_fh()
231 	fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :  in ovl_d_to_fh()
232 				ovl_dentry_upper(dentry), !enc_lower);  in ovl_d_to_fh()
250 			    dentry, err, buflen, fh ? (int)fh->len : 0,  in ovl_d_to_fh()
255 static int ovl_dentry_to_fh(struct dentry *dentry, u32 *fid, int *max_len)  in ovl_dentry_to_fh()  argument
259 	res = ovl_d_to_fh(dentry, (char *)fid, len);  in ovl_dentry_to_fh()
273 	struct dentry *dentry;  in ovl_encode_fh()  local
280 	dentry = d_find_any_alias(inode);  in ovl_encode_fh()
281 	if (WARN_ON(!dentry))  in ovl_encode_fh()
284 	type = ovl_dentry_to_fh(dentry, fid, max_len);  in ovl_encode_fh()
286 	dput(dentry);  in ovl_encode_fh()
293 static struct dentry *ovl_obtain_alias(struct super_block *sb,  in ovl_obtain_alias()
294 				       struct dentry *upper_alias,  in ovl_obtain_alias()
296 				       struct dentry *index)  in ovl_obtain_alias()
298 	struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;  in ovl_obtain_alias()
299 	struct dentry *upper = upper_alias ?: index;  in ovl_obtain_alias()
300 	struct dentry *dentry;  in ovl_obtain_alias()  local
323 	dentry = d_find_any_alias(inode);  in ovl_obtain_alias()
324 	if (!dentry) {  in ovl_obtain_alias()
325 		dentry = d_alloc_anon(inode->i_sb);  in ovl_obtain_alias()
326 		if (!dentry)  in ovl_obtain_alias()
333 			oe->lowerstack->dentry = dget(lower);  in ovl_obtain_alias()
336 		dentry->d_fsdata = oe;  in ovl_obtain_alias()
338 			ovl_dentry_set_upper_alias(dentry);  in ovl_obtain_alias()
341 	return d_instantiate_anon(dentry, inode);  in ovl_obtain_alias()
345 	dput(dentry);  in ovl_obtain_alias()
350 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)  in ovl_dentry_real_at()  argument
352 	struct ovl_entry *oe = dentry->d_fsdata;  in ovl_dentry_real_at()
356 		return ovl_dentry_upper(dentry);  in ovl_dentry_real_at()
360 			return oe->lowerstack[i].dentry;  in ovl_dentry_real_at()
372 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()
373 					  struct dentry *real,  in ovl_lookup_real_one()
377 	struct dentry *this, *parent = NULL;  in ovl_lookup_real_one()
428 static struct dentry *ovl_lookup_real(struct super_block *sb,
429 				      struct dentry *real,
435 static struct dentry *ovl_lookup_real_inode(struct super_block *sb,  in ovl_lookup_real_inode()
436 					    struct dentry *real,  in ovl_lookup_real_inode()
441 	struct dentry *index = NULL;  in ovl_lookup_real_inode()
442 	struct dentry *this = NULL;  in ovl_lookup_real_inode()
469 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lookup_real_inode()
501 static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,  in ovl_lookup_real_ancestor()
502 					       struct dentry *real,  in ovl_lookup_real_ancestor()
505 	struct dentry *next, *parent = NULL;  in ovl_lookup_real_ancestor()
506 	struct dentry *ancestor = ERR_PTR(-EIO);  in ovl_lookup_real_ancestor()
554 static struct dentry *ovl_lookup_real(struct super_block *sb,  in ovl_lookup_real()
555 				      struct dentry *real,  in ovl_lookup_real()
558 	struct dentry *connected;  in ovl_lookup_real()
566 		struct dentry *next, *this;  in ovl_lookup_real()
567 		struct dentry *parent = NULL;  in ovl_lookup_real()
568 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
656 static struct dentry *ovl_get_dentry(struct super_block *sb,  in ovl_get_dentry()
657 				     struct dentry *upper,  in ovl_get_dentry()
659 				     struct dentry *index)  in ovl_get_dentry()
664 	struct dentry *real = upper ?: (index ?: lowerpath->dentry);  in ovl_get_dentry()
684 static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,  in ovl_upper_fh_to_d()
688 	struct dentry *dentry;  in ovl_upper_fh_to_d()  local
689 	struct dentry *upper;  in ovl_upper_fh_to_d()
698 	dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_upper_fh_to_d()
701 	return dentry;  in ovl_upper_fh_to_d()
704 static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,  in ovl_lower_fh_to_d()
710 	struct dentry *dentry = NULL;  in ovl_lower_fh_to_d()  local
711 	struct dentry *index = NULL;  in ovl_lower_fh_to_d()
720 	if (!d_is_dir(origin.dentry) ||  in ovl_lower_fh_to_d()
721 	    !(origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
722 		inode = ovl_lookup_inode(sb, origin.dentry, false);  in ovl_lower_fh_to_d()
727 			dentry = d_find_any_alias(inode);  in ovl_lower_fh_to_d()
729 			if (dentry)  in ovl_lower_fh_to_d()
746 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lower_fh_to_d()
752 		dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_lower_fh_to_d()
758 	if (d_is_dir(origin.dentry) &&  in ovl_lower_fh_to_d()
759 	    (origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
760 		dput(origin.dentry);  in ovl_lower_fh_to_d()
761 		origin.dentry = NULL;  in ovl_lower_fh_to_d()
767 		err = ovl_verify_origin(index, origin.dentry, false);  in ovl_lower_fh_to_d()
772 	dentry = ovl_get_dentry(sb, NULL, &origin, index);  in ovl_lower_fh_to_d()
775 	dput(origin.dentry);  in ovl_lower_fh_to_d()
777 	return dentry;  in ovl_lower_fh_to_d()
780 	dentry = ERR_PTR(err);  in ovl_lower_fh_to_d()
784 static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,  in ovl_fh_to_dentry()
787 	struct dentry *dentry = NULL;  in ovl_fh_to_dentry()  local
802 	dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?  in ovl_fh_to_dentry()
805 	err = PTR_ERR(dentry);  in ovl_fh_to_dentry()
806 	if (IS_ERR(dentry) && err != -ESTALE)  in ovl_fh_to_dentry()
809 	return dentry;  in ovl_fh_to_dentry()
817 static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,  in ovl_fh_to_parent()
824 static int ovl_get_name(struct dentry *parent, char *name,  in ovl_get_name()
825 			struct dentry *child)  in ovl_get_name()
835 static struct dentry *ovl_get_parent(struct dentry *dentry)  in ovl_get_parent()  argument