From patchwork Tue Jan 29 10:11:59 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miao Xie X-Patchwork-Id: 2060811 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id F2EF13FDD1 for ; Tue, 29 Jan 2013 10:11:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753141Ab3A2KLW (ORCPT ); Tue, 29 Jan 2013 05:11:22 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:19835 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751845Ab3A2KLV (ORCPT ); Tue, 29 Jan 2013 05:11:21 -0500 X-IronPort-AV: E=Sophos;i="4.84,559,1355068800"; d="scan'208";a="6660423" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 29 Jan 2013 18:09:09 +0800 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 r0TABIxY020765 for ; Tue, 29 Jan 2013 18:11:18 +0800 Received: from [10.167.225.199] ([10.167.225.199]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2013012918101339-137480 ; Tue, 29 Jan 2013 18:10:13 +0800 Message-ID: <5107A06F.8020909@cn.fujitsu.com> Date: Tue, 29 Jan 2013 18:11:59 +0800 From: Miao Xie Reply-To: miaox@cn.fujitsu.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: Linux Btrfs Subject: [PATCH V2 08/10] Btrfs: use the inode own lock to protect its delalloc_bytes References: <51079D72.7000301@cn.fujitsu.com> In-Reply-To: <51079D72.7000301@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/01/29 18:10:13, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/01/29 18:10:13, Serialize complete at 2013/01/29 18:10:13 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org We need not use a global lock to protect the delalloc_bytes of the inode, just use its own lock. In this way, we can reduce the lock contention and ->delalloc_lock will just protect delalloc inode list. Signed-off-by: Miao Xie --- Changelog v1 -> v2: - none. --- fs/btrfs/btrfs_inode.h | 1 + fs/btrfs/disk-io.c | 2 ++ fs/btrfs/inode.c | 47 ++++++++++++++++++++++++++++++++++------------- 3 files changed, 37 insertions(+), 13 deletions(-) diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 2a8c242..c935a77 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -40,6 +40,7 @@ #define BTRFS_INODE_HAS_ASYNC_EXTENT 6 #define BTRFS_INODE_NEEDS_FULL_SYNC 7 #define BTRFS_INODE_COPY_EVERYTHING 8 +#define BTRFS_INODE_IN_DELALLOC_LIST 9 /* in memory btrfs inode */ struct btrfs_inode { diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 29d52af..abf1f10 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3685,6 +3685,8 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) delalloc_inodes); list_del_init(&btrfs_inode->delalloc_inodes); + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &btrfs_inode->runtime_flags); btrfs_invalidate_inodes(btrfs_inode->root); } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d98b508..4f92b35 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1508,15 +1508,22 @@ static void btrfs_set_bit_hook(struct inode *inode, spin_unlock(&BTRFS_I(inode)->lock); } - spin_lock(&root->fs_info->delalloc_lock); - BTRFS_I(inode)->delalloc_bytes += len; __percpu_counter_add(&root->fs_info->delalloc_bytes, len, root->fs_info->delalloc_batch); - if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { - list_add_tail(&BTRFS_I(inode)->delalloc_inodes, - &root->fs_info->delalloc_inodes); + spin_lock(&BTRFS_I(inode)->lock); + BTRFS_I(inode)->delalloc_bytes += len; + if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags)) { + spin_lock(&root->fs_info->delalloc_lock); + if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { + list_add_tail(&BTRFS_I(inode)->delalloc_inodes, + &root->fs_info->delalloc_inodes); + set_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags); + } + spin_unlock(&root->fs_info->delalloc_lock); } - spin_unlock(&root->fs_info->delalloc_lock); + spin_unlock(&BTRFS_I(inode)->lock); } } @@ -1551,16 +1558,22 @@ static void btrfs_clear_bit_hook(struct inode *inode, && do_list) btrfs_free_reserved_data_space(inode, len); - spin_lock(&root->fs_info->delalloc_lock); __percpu_counter_add(&root->fs_info->delalloc_bytes, -len, root->fs_info->delalloc_batch); + spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->delalloc_bytes -= len; - if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && - !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { - list_del_init(&BTRFS_I(inode)->delalloc_inodes); + test_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags)) { + spin_lock(&root->fs_info->delalloc_lock); + if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) { + list_del_init(&BTRFS_I(inode)->delalloc_inodes); + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &BTRFS_I(inode)->runtime_flags); + } + spin_unlock(&root->fs_info->delalloc_lock); } - spin_unlock(&root->fs_info->delalloc_lock); + spin_unlock(&BTRFS_I(inode)->lock); } } @@ -7316,14 +7329,19 @@ fail: static int btrfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { + u64 delalloc_bytes; struct inode *inode = dentry->d_inode; u32 blocksize = inode->i_sb->s_blocksize; generic_fillattr(inode, stat); stat->dev = BTRFS_I(inode)->root->anon_dev; stat->blksize = PAGE_CACHE_SIZE; + + spin_lock(&BTRFS_I(inode)->lock); + delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; + spin_unlock(&BTRFS_I(inode)->lock); stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + - ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; + ALIGN(delalloc_bytes, blocksize)) >> 9; return 0; } @@ -7611,8 +7629,11 @@ again: list_del_init(&binode->delalloc_inodes); inode = igrab(&binode->vfs_inode); - if (!inode) + if (!inode) { + clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, + &binode->runtime_flags); continue; + } list_add_tail(&binode->delalloc_inodes, &root->fs_info->delalloc_inodes);