From: Jeff Layton Subject: [RFC PATCH v1 28/30] btrfs: only dirty the inode in btrfs_update_time if something was changed Date: Wed, 21 Dec 2016 12:03:45 -0500 Message-ID: <1482339827-7882-29-git-send-email-jlayton@redhat.com> References: <1482339827-7882-1-git-send-email-jlayton@redhat.com> Cc: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <1482339827-7882-1-git-send-email-jlayton@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org At this point, we know that "now" and the file times may differ, and we suspect that the i_version has been flagged to be bumped. Attempt to bump the i_version, and only mark the inode dirty if that actually occurred or if one of the times was updated. Signed-off-by: Jeff Layton --- fs/btrfs/inode.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a03e5a1d5e05..65a7065c0fbf 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6025,19 +6025,20 @@ static int btrfs_update_time(struct inode *inode, struct timespec *now, int flags) { struct btrfs_root *root = BTRFS_I(inode)->root; + bool dirty = flags & ~S_VERSION; if (btrfs_root_readonly(root)) return -EROFS; if (flags & S_VERSION) - inode_inc_iversion(inode, true); + dirty |= inode_inc_iversion(inode, dirty); if (flags & S_CTIME) inode->i_ctime = *now; if (flags & S_MTIME) inode->i_mtime = *now; if (flags & S_ATIME) inode->i_atime = *now; - return btrfs_dirty_inode(inode); + return dirty ? btrfs_dirty_inode(inode) : 0; } /* -- 2.7.4