From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 387AEC433DB for ; Mon, 11 Jan 2021 10:59:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EBCDA2222D for ; Mon, 11 Jan 2021 10:59:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729598AbhAKK7A (ORCPT ); Mon, 11 Jan 2021 05:59:00 -0500 Received: from mx2.suse.de ([195.135.220.15]:34456 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729458AbhAKK7A (ORCPT ); Mon, 11 Jan 2021 05:59:00 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1610362694; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=YoNCE+1BmQlHL5Tv9Xb58anQKfY89tW9FqyGgC63WIU=; b=mXC1FXrxDg4mTMZ9nkWQVraszlxqfGXc/otiFgdczTlBpmPuG654Duhw3BOP33QNrDSmxp fdSq8mc3+MPV3qkn8Kf0fv/63fozsRKN7wUO6JrnY9IKiHfNqNWsliWWmYbWj7F0VJ7q98 kgGSQ+l5gM83tvXWq5zhcnTqW5IbpEQ= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 51CB0ACBA; Mon, 11 Jan 2021 10:58:14 +0000 (UTC) From: Nikolay Borisov To: dsterba@suse.cz Cc: linux-btrfs@vger.kernel.org, Nikolay Borisov Subject: [PATCH 1/2] btrfs: Make btrfs_start_delalloc_root's nr argument a long Date: Mon, 11 Jan 2021 12:58:11 +0200 Message-Id: <20210111105812.423915-1-nborisov@suse.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org It's currently u64 which gets instantly translated either to LONG_MAX (if U64_MAX is passed) or casted to an unsigned long (which is in fact, wrong because iwriteback_control::nr_to_write is a signed, long type). Just convert the function's argument to be long time which obviates the need to manually convert u64 value to a long. Adjust all call sites which pass U64_MAX to pass LONG_MAX. Finally ensure that in shrink_delalloc the u64 is converted to a long without overflowing, resulting in a negative number. Signed-off-by: Nikolay Borisov --- David, Here are 2 patches which I believe should be folded into "btrfs: shrink delalloc pages instead of full inodes" so as to avoid needless casts and a possible overflow, resulting in negative nr_to_write value. fs/btrfs/ctree.h | 2 +- fs/btrfs/dev-replace.c | 2 +- fs/btrfs/inode.c | 6 +++--- fs/btrfs/ioctl.c | 2 +- fs/btrfs/space-info.c | 3 ++- 5 files changed, 8 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 05f009fbbd55..3dc67f241919 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3101,7 +3101,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, u32 min_type); int btrfs_start_delalloc_snapshot(struct btrfs_root *root); -int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr, +int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, bool in_reclaim_context); int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end, unsigned int extra_bits, diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 324f646d6e5e..bc73f798ce3a 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -715,7 +715,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, * flush all outstanding I/O and inode extent mappings before the * copy operation is declared as being finished */ - ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false); + ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); if (ret) { mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return ret; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5c173a30a97a..69e24341afc0 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -9474,11 +9474,11 @@ int btrfs_start_delalloc_snapshot(struct btrfs_root *root) return start_delalloc_inodes(root, &wbc, true, false); } -int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr, +int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, bool in_reclaim_context) { struct writeback_control wbc = { - .nr_to_write = (nr == U64_MAX) ? LONG_MAX : (unsigned long)nr, + .nr_to_write = nr, .sync_mode = WB_SYNC_NONE, .range_start = 0, .range_end = LLONG_MAX, @@ -9500,7 +9500,7 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr, * Reset nr_to_write here so we know that we're doing a full * flush. */ - if (nr == U64_MAX) + if (nr == LONG_MAX) wbc.nr_to_write = LONG_MAX; root = list_first_entry(&splice, struct btrfs_root, diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index db29c1b54daa..998ea561d934 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -4973,7 +4973,7 @@ long btrfs_ioctl(struct file *file, unsigned int case BTRFS_IOC_SYNC: { int ret; - ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false); + ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); if (ret) return ret; ret = btrfs_sync_fs(inode->i_sb, 1); diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index e8347461c8dd..84fb94e78a8f 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -532,7 +532,8 @@ static void shrink_delalloc(struct btrfs_fs_info *fs_info, loops = 0; while ((delalloc_bytes || dio_bytes) && loops < 3) { - u64 nr_pages = min(delalloc_bytes, to_reclaim) >> PAGE_SHIFT; + u64 temp = min(delalloc_bytes, to_reclaim) >> PAGE_SHIFT; + long nr_pages = min_t(u64, temp, LONG_MAX); btrfs_start_delalloc_roots(fs_info, nr_pages, true); -- 2.25.1