From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([222.73.24.84]:22079 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751968AbaAFB5q (ORCPT ); Sun, 5 Jan 2014 20:57:46 -0500 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id s061vfHO002425 for ; Mon, 6 Jan 2014 09:57:43 +0800 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v3 2/9] btrfs: Add noautodefrag mount option. Date: Mon, 6 Jan 2014 09:58:26 +0800 Message-Id: <1388973513-11240-3-git-send-email-quwenruo@cn.fujitsu.com> In-Reply-To: <1388973513-11240-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1388973513-11240-1-git-send-email-quwenruo@cn.fujitsu.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: Btrfs has autodefrag mount option but no pairing noautodefrag option, which makes it impossible to disable autodefrag without umount. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba --- Changelog: v2: Add noautodefrag option v3: None --- Documentation/filesystems/btrfs.txt | 8 +++++--- fs/btrfs/super.c | 8 +++++++- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt index ce487a2..e87609a 100644 --- a/Documentation/filesystems/btrfs.txt +++ b/Documentation/filesystems/btrfs.txt @@ -46,10 +46,12 @@ Options with (*) are default options and will not show in the mount options. bytes, optionally with a K, M, or G suffix, case insensitive. Default is 1MB. + noautodefrag(*) autodefrag - Detect small random writes into files and queue them up for the - defrag process. Works best for small files; Not well suited for - large database workloads. + Disable/enable auto defragmentation. + Auto defragmentation detects small random writes into files and queue + them up for the defrag process. Works best for small files; + Not well suited for large database workloads. check_int check_int_data diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index fe9d8a6..c65f696 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -323,7 +323,7 @@ enum { Opt_no_space_cache, Opt_recovery, Opt_skip_balance, Opt_check_integrity, Opt_check_integrity_including_extent_data, Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, - Opt_commit_interval, Opt_barrier, + Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_err, }; @@ -357,6 +357,7 @@ static match_table_t tokens = { {Opt_enospc_debug, "enospc_debug"}, {Opt_subvolrootid, "subvolrootid=%d"}, {Opt_defrag, "autodefrag"}, + {Opt_nodefrag, "noautodefrag"}, {Opt_inode_cache, "inode_cache"}, {Opt_no_space_cache, "nospace_cache"}, {Opt_recovery, "recovery"}, @@ -602,6 +603,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) btrfs_info(root->fs_info, "enabling auto defrag"); btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); break; + case Opt_nodefrag: + if (btrfs_test_opt(root, AUTO_DEFRAG)) + btrfs_info(root->fs_info, "disabling auto defrag"); + btrfs_clear_opt(info->mount_opt, AUTO_DEFRAG); + break; case Opt_recovery: btrfs_info(root->fs_info, "enabling auto recovery"); btrfs_set_opt(info->mount_opt, RECOVERY); -- 1.8.5.2