From patchwork Thu Mar 17 14:30:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Foster X-Patchwork-Id: 8611811 Return-Path: X-Original-To: patchwork-linux-block@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3C19B9FC32 for ; Thu, 17 Mar 2016 14:31:01 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 723B4201ED for ; Thu, 17 Mar 2016 14:31:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B537620364 for ; Thu, 17 Mar 2016 14:30:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030281AbcCQOar (ORCPT ); Thu, 17 Mar 2016 10:30:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45414 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934653AbcCQOaj (ORCPT ); Thu, 17 Mar 2016 10:30:39 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 6BDFDC00EB35; Thu, 17 Mar 2016 14:30:39 +0000 (UTC) Received: from bfoster.bfoster (dhcp-41-24.bos.redhat.com [10.18.41.24]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2HEUdb0003136; Thu, 17 Mar 2016 10:30:39 -0400 Received: by bfoster.bfoster (Postfix, from userid 1000) id CE5EA125E70; Thu, 17 Mar 2016 10:30:37 -0400 (EDT) From: Brian Foster To: xfs@oss.sgi.com Cc: dm-devel@redhat.com, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 7/9] dm thin: add method to provision space Date: Thu, 17 Mar 2016 10:30:35 -0400 Message-Id: <1458225037-24155-8-git-send-email-bfoster@redhat.com> In-Reply-To: <1458225037-24155-1-git-send-email-bfoster@redhat.com> References: <1458225037-24155-1-git-send-email-bfoster@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a hacky interface added to support the filesystem experiment for reserving blocks out of thin pools. The XFS POC uses this method provision space in the pool when blocks are allocated. The number of actual blocks allocated is returned, which is used to update the filesystem accounting. Signed-off-by: Brian Foster --- drivers/md/dm-thin.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index ac770d89..00b7322 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -4389,6 +4389,52 @@ static int thin_get_reserved_space(struct dm_target *ti, sector_t *nr_sects) return 0; } +static int thin_provision_space(struct dm_target *ti, sector_t offset, sector_t len) +{ + struct thin_c *tc = ti->private; + struct pool *pool = tc->pool; + sector_t end; + dm_block_t pblock; + dm_block_t vblock; + int error; + struct dm_thin_lookup_result lookup; + sector_t count; + + if (!is_factor(offset, pool->sectors_per_block)) + return -EINVAL; + + if (!len || !is_factor(len, pool->sectors_per_block)) + return -EINVAL; + + end = offset + len; + + count = 0; + while (offset < end) { + vblock = offset / pool->sectors_per_block; + + error = dm_thin_find_block(tc->td, vblock, true, &lookup); + if (error == 0) + goto next; + if (error != -ENODATA) + return error; + + error = alloc_data_block(tc, &pblock); + if (error) + return error; + + error = dm_thin_insert_block(tc->td, vblock, pblock); + if (error) + return error; + + count += pool->sectors_per_block; +next: + offset += pool->sectors_per_block; + } + + /* XXX: int -> sector_t ! */ + return count; +} + static struct target_type thin_target = { .name = "thin", .version = {1, 18, 0}, @@ -4405,6 +4451,7 @@ static struct target_type thin_target = { .io_hints = thin_io_hints, .reserve_space = thin_reserve_space, .get_reserved_space = thin_get_reserved_space, + .provision_space = thin_provision_space, }; /*----------------------------------------------------------------*/