fs/overlayfs/namei.c

120 	struct ovl_fh *fh = NULL;
132 	fh = kzalloc(res + OVL_FH_WIRE_OFFSET, GFP_KERNEL);
133 	if (!fh)
136 	res = ovl_getxattr_upper(ofs, upperdentry, ox, fh->buf, res);
140 	err = ovl_check_fb_len(&fh->fb, res);
147 	return fh;
150 	kfree(fh);
157 	pr_warn_ratelimited("invalid origin (%*phN)\n", res, fh);
161 struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
176 	    !uuid_equal(&fh->fb.uuid, &mnt->mnt_sb->s_uuid) :
177 	    !uuid_is_null(&fh->fb.uuid))
180 	bytes = (fh->fb.len - offsetof(struct ovl_fb, fid));
181 	real = exportfs_decode_fh(mnt, (struct fid *)fh->fb.fid,
182 				  bytes >> 2, (int)fh->fb.type,
192 		    !(fh->fb.flags & OVL_FH_FLAG_PATH_UPPER))
421 int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
430 		 * fh->uuid to layer.
436 		origin = ovl_decode_real_fh(ofs, fh, ofs->layers[i].mnt,
475 	struct ovl_fh *fh = ovl_get_fh(ofs, upperdentry, OVL_XATTR_ORIGIN);
478 	if (IS_ERR_OR_NULL(fh))
479 		return PTR_ERR(fh);
481 	err = ovl_check_origin_fh(ofs, fh, false, upperdentry, stackp);
482 	kfree(fh);
494  * Verify that @fh matches the file handle stored in xattr @name.
498 			 enum ovl_xattr ox, const struct ovl_fh *fh)
509 	if (fh->fb.len != ofh->fb.len || memcmp(&fh->fb, &ofh->fb, fh->fb.len))
517 		      enum ovl_xattr ox, const struct ovl_fh *fh,
522 	err = ovl_verify_fh(ofs, dentry, ox, fh);
524 		err = ovl_setxattr(ofs, dentry, ox, fh->buf, fh->fb.len);
542 	struct ovl_fh *fh;
545 	fh = ovl_encode_real_fh(ofs, real, is_upper);
546 	err = PTR_ERR(fh);
547 	if (IS_ERR(fh)) {
548 		fh = NULL;
552 	err = ovl_verify_set_fh(ofs, dentry, ox, fh, is_upper, set);
557 	kfree(fh);
573 	struct ovl_fh *fh;
579 	fh = ovl_get_fh(ofs, index, OVL_XATTR_UPPER);
580 	if (IS_ERR_OR_NULL(fh))
581 		return ERR_CAST(fh);
583 	upper = ovl_decode_real_fh(ofs, fh, ovl_upper_mnt(ofs), connected);
584 	kfree(fh);
606 	struct ovl_fh *fh = NULL;
622 	fh = kzalloc(len + OVL_FH_WIRE_OFFSET, GFP_KERNEL);
623 	if (!fh)
627 	if (hex2bin(fh->buf, index->d_name.name, len))
630 	err = ovl_check_fb_len(&fh->fb, len);
672 	err = ovl_verify_fh(ofs, upper, OVL_XATTR_ORIGIN, fh);
679 		err = ovl_check_origin_fh(ofs, fh, false, index, &stack);
689 	kfree(fh);
705 int ovl_get_index_name_fh(const struct ovl_fh *fh, struct qstr *name)
709 	n = kcalloc(fh->fb.len, 2, GFP_KERNEL);
713 	s  = bin2hex(n, fh->buf, fh->fb.len);
738 	struct ovl_fh *fh;
741 	fh = ovl_encode_real_fh(ofs, origin, false);
742 	if (IS_ERR(fh))
743 		return PTR_ERR(fh);
745 	err = ovl_get_index_name_fh(fh, name);
747 	kfree(fh);
752 struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
758 	err = ovl_get_index_name_fh(fh, &name);
898 	const struct ovl_fh *fh;
904 	fh = ovl_get_origin_fh(ofs, lower);
905 	if (IS_ERR(fh))
906 		return PTR_ERR(fh);
912 	err = ovl_set_origin_fh(ofs, fh, upper);
918 	kfree(fh);
1139 		 * If no origin fh is stored in upper of a merge dir, store fh