From patchwork Tue May 14 23:33:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 10944065 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C1A81390 for ; Tue, 14 May 2019 23:33:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5828128980 for ; Tue, 14 May 2019 23:33:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3205428987; Tue, 14 May 2019 23:33:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A9C9928980 for ; Tue, 14 May 2019 23:33:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726394AbfENXdx (ORCPT ); Tue, 14 May 2019 19:33:53 -0400 Received: from mx2.suse.de ([195.135.220.15]:58022 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726180AbfENXdx (ORCPT ); Tue, 14 May 2019 19:33:53 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 0FE0BAD7B for ; Tue, 14 May 2019 23:33:52 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH] btrfs: extent-tree: Refactor add_pinned_bytes() to add|sub_pinned_bytes() Date: Wed, 15 May 2019 07:33:48 +0800 Message-Id: <20190514233348.10696-1-wqu@suse.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Instead of using @sign to determine whether we're adding or subtracting. Even it only has 3 callers, it's still (and in fact already caused problem in the past) confusing to use. Refactor add_pinned_bytes() to add_pinned_bytes() and sub_pinned_bytes() to explicitly show what we're doing. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba --- To David, Would you please fold this patch to "btrfs: extent-tree: Fix a bug that btrfs is unable to add pinned bytes" in misc-next branch? Thanks, Qu --- fs/btrfs/extent-tree.c | 43 ++++++++++++++++++++++++++---------------- 1 file changed, 27 insertions(+), 16 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 1aee51a9f3bf..aa8c5e3247fc 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -756,27 +756,38 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, return NULL; } -static void add_pinned_bytes(struct btrfs_fs_info *fs_info, - struct btrfs_ref *ref, int sign) +static u64 generic_ref_to_space_flags(struct btrfs_ref *ref) { - struct btrfs_space_info *space_info; - s64 num_bytes; - u64 flags; - - ASSERT(sign == 1 || sign == -1); - num_bytes = sign * ref->len; if (ref->type == BTRFS_REF_METADATA) { if (ref->tree_ref.root == BTRFS_CHUNK_TREE_OBJECTID) - flags = BTRFS_BLOCK_GROUP_SYSTEM; + return BTRFS_BLOCK_GROUP_SYSTEM; else - flags = BTRFS_BLOCK_GROUP_METADATA; - } else { - flags = BTRFS_BLOCK_GROUP_DATA; + return BTRFS_BLOCK_GROUP_METADATA; } + return BTRFS_BLOCK_GROUP_DATA; +} + +static void add_pinned_bytes(struct btrfs_fs_info *fs_info, + struct btrfs_ref *ref) +{ + struct btrfs_space_info *space_info; + u64 flags = generic_ref_to_space_flags(ref); + + space_info = __find_space_info(fs_info, flags); + ASSERT(space_info); + percpu_counter_add_batch(&space_info->total_bytes_pinned, ref->len, + BTRFS_TOTAL_BYTES_PINNED_BATCH); +} + +static void sub_pinned_bytes(struct btrfs_fs_info *fs_info, + struct btrfs_ref *ref) +{ + struct btrfs_space_info *space_info; + u64 flags = generic_ref_to_space_flags(ref); space_info = __find_space_info(fs_info, flags); ASSERT(space_info); - percpu_counter_add_batch(&space_info->total_bytes_pinned, num_bytes, + percpu_counter_add_batch(&space_info->total_bytes_pinned, -ref->len, BTRFS_TOTAL_BYTES_PINNED_BATCH); } @@ -2065,7 +2076,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, btrfs_ref_tree_mod(fs_info, generic_ref); if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) - add_pinned_bytes(fs_info, generic_ref, -1); + sub_pinned_bytes(fs_info, generic_ref); return ret; } @@ -7191,7 +7202,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans, } out: if (pin) - add_pinned_bytes(fs_info, &generic_ref, 1); + add_pinned_bytes(fs_info, &generic_ref); if (last_ref) { /* @@ -7239,7 +7250,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref) btrfs_ref_tree_mod(fs_info, ref); if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) - add_pinned_bytes(fs_info, ref, 1); + add_pinned_bytes(fs_info, ref); return ret; }