From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 828742126578B for ; Wed, 15 May 2019 12:27:32 -0700 (PDT) From: Vivek Goyal Subject: [PATCH v2 01/30] fuse: delete dentry if timeout is zero Date: Wed, 15 May 2019 15:26:46 -0400 Message-Id: <20190515192715.18000-2-vgoyal@redhat.com> In-Reply-To: <20190515192715.18000-1-vgoyal@redhat.com> References: <20190515192715.18000-1-vgoyal@redhat.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-nvdimm@lists.01.org Cc: swhiteho@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, miklos@szeredi.hu List-ID: From: Miklos Szeredi Don't hold onto dentry in lru list if need to re-lookup it anyway at next access. More advanced version of this patch would periodically flush out dentries from the lru which have gone stale. Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index dd0f64f7bc06..fd8636e67ae9 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -29,12 +29,26 @@ union fuse_dentry { struct rcu_head rcu; }; -static inline void fuse_dentry_settime(struct dentry *entry, u64 time) +static void fuse_dentry_settime(struct dentry *dentry, u64 time) { - ((union fuse_dentry *) entry->d_fsdata)->time = time; + /* + * Mess with DCACHE_OP_DELETE because dput() will be faster without it. + * Don't care about races, either way it's just an optimization + */ + if ((time && (dentry->d_flags & DCACHE_OP_DELETE)) || + (!time && !(dentry->d_flags & DCACHE_OP_DELETE))) { + spin_lock(&dentry->d_lock); + if (time) + dentry->d_flags &= ~DCACHE_OP_DELETE; + else + dentry->d_flags |= DCACHE_OP_DELETE; + spin_unlock(&dentry->d_lock); + } + + ((union fuse_dentry *) dentry->d_fsdata)->time = time; } -static inline u64 fuse_dentry_time(struct dentry *entry) +static inline u64 fuse_dentry_time(const struct dentry *entry) { return ((union fuse_dentry *) entry->d_fsdata)->time; } @@ -255,8 +269,14 @@ static void fuse_dentry_release(struct dentry *dentry) kfree_rcu(fd, rcu); } +static int fuse_dentry_delete(const struct dentry *dentry) +{ + return time_before64(fuse_dentry_time(dentry), get_jiffies_64()); +} + const struct dentry_operations fuse_dentry_operations = { .d_revalidate = fuse_dentry_revalidate, + .d_delete = fuse_dentry_delete, .d_init = fuse_dentry_init, .d_release = fuse_dentry_release, }; -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm