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From: Vivek Goyal <vgoyal@redhat.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com,
	dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com
Subject: [PATCH 11/52] fuse: implement FUSE_FORGET for virtio-fs
Date: Mon, 10 Dec 2018 12:12:37 -0500
Message-ID: <20181210171318.16998-12-vgoyal@redhat.com> (raw)
In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com>

From: Stefan Hajnoczi <stefanha@redhat.com>

Sent single FUSE_FORGET requests on the hiprio queue.  In the future it
may be possible to do FUSE_BATCH_FORGET but that is tricky since
virtio-fs gets called synchronously when forgets are queued.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 fs/fuse/virtio_fs.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 89 insertions(+), 4 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index fa99a31ee930..225eb729656f 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -140,10 +140,26 @@ static void virtio_fs_notifications_done_work(struct work_struct *work)
 	return;
 }
 
-static void virtio_fs_hiprio_done(struct virtqueue *vq)
+/* Work function for hiprio completion */
+static void virtio_fs_hiprio_done_work(struct work_struct *work)
 {
-	/* TODO */
-	dev_dbg(&vq->vdev->dev, "%s\n", __func__);
+	struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
+						 done_work);
+	struct fuse_pqueue *fpq = &fsvq->fud->pq;
+	struct virtqueue *vq = fsvq->vq;
+
+	/* Free completed FUSE_FORGET requests */
+	spin_lock(&fpq->lock);
+	do {
+		unsigned len;
+		void *req;
+
+		virtqueue_disable_cb(vq);
+
+		while ((req = virtqueue_get_buf(vq, &len)) != NULL)
+			kfree(req);
+	} while (!virtqueue_enable_cb(vq) && likely(!virtqueue_is_broken(vq)));
+	spin_unlock(&fpq->lock);
 }
 
 /* Allocate and copy args into req->argbuf */
@@ -302,6 +318,7 @@ static int virtio_fs_setup_vqs(struct virtio_device *vdev,
 	callbacks[1] = virtio_fs_vq_done;
 	snprintf(fs->vqs[1].name, sizeof(fs->vqs[1].name), "hiprio");
 	names[1] = fs->vqs[1].name;
+	INIT_WORK(&fs->vqs[1].done_work, virtio_fs_hiprio_done_work);
 
 	/* Initialize the requests virtqueues */
 	for (i = 2; i < fs->nvqs; i++) {
@@ -424,11 +441,79 @@ static struct virtio_driver virtio_fs_driver = {
 #endif
 };
 
+struct virtio_fs_forget {
+	struct fuse_in_header ih;
+	struct fuse_forget_in arg;
+};
+
 static void virtio_fs_wake_forget_and_unlock(struct fuse_iqueue *fiq)
 __releases(fiq->waitq.lock)
 {
-	/* TODO */
+	struct fuse_forget_link *link;
+	struct virtio_fs_forget *forget;
+	struct fuse_pqueue *fpq;
+	struct scatterlist sg;
+	struct scatterlist *sgs[] = {&sg};
+	struct virtio_fs *fs;
+	struct virtqueue *vq;
+	bool notify;
+	u64 unique;
+	int ret;
+
+	BUG_ON(!fiq->forget_list_head.next);
+	link = fiq->forget_list_head.next;
+	BUG_ON(link->next);
+	fiq->forget_list_head.next = NULL;
+	fiq->forget_list_tail = &fiq->forget_list_head;
+
+	unique = fuse_get_unique(fiq);
+
+	fs = fiq->priv;
+
 	spin_unlock(&fiq->waitq.lock);
+
+	/* Allocate a buffer for the request */
+	forget = kmalloc(sizeof(*forget), GFP_ATOMIC);
+	if (!forget) {
+		pr_err("virtio-fs: dropped FORGET: kmalloc failed\n");
+		goto out; /* TODO avoid dropping it? */
+	}
+
+	forget->ih = (struct fuse_in_header){
+		.opcode = FUSE_FORGET,
+		.nodeid = link->forget_one.nodeid,
+		.unique = unique,
+		.len = sizeof(*forget),
+	};
+	forget->arg = (struct fuse_forget_in){
+		.nlookup = link->forget_one.nlookup,
+	};
+
+	sg_init_one(&sg, forget, sizeof(*forget));
+
+	/* Enqueue the request */
+	vq = fs->vqs[1].vq;
+	dev_dbg(&vq->vdev->dev, "%s\n", __func__);
+	fpq = vq_to_fpq(vq);
+	spin_lock(&fpq->lock);
+
+	ret = virtqueue_add_sgs(vq, sgs, 1, 0, forget, GFP_ATOMIC);
+	if (ret < 0) {
+		pr_err("virtio-fs: dropped FORGET: queue full\n");
+		/* TODO handle full virtqueue */
+		spin_unlock(&fpq->lock);
+		goto out;
+	}
+
+	notify = virtqueue_kick_prepare(vq);
+
+	spin_unlock(&fpq->lock);
+
+	if (notify)
+		virtqueue_notify(vq);
+
+out:
+	kfree(link);
 }
 
 static void virtio_fs_wake_interrupt_and_unlock(struct fuse_iqueue *fiq)
-- 
2.13.6


  parent reply index

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10 17:12 [PATCH 00/52] [RFC] virtio-fs: shared file system for virtual machines Vivek Goyal
2018-12-10 17:12 ` [PATCH 01/52] fuse: add skeleton virtio_fs.ko module Vivek Goyal
2018-12-10 17:12 ` [PATCH 02/52] fuse: add probe/remove virtio driver Vivek Goyal
2018-12-10 17:12 ` [PATCH 03/52] fuse: rely on mutex_unlock() barrier instead of fput() Vivek Goyal
2018-12-10 17:12 ` [PATCH 04/52] fuse: extract fuse_fill_super_common() Vivek Goyal
2018-12-10 17:12 ` [PATCH 05/52] virtio_fs: get mount working Vivek Goyal
2018-12-10 17:12 ` [PATCH 06/52] fuse: export fuse_end_request() Vivek Goyal
2018-12-10 17:12 ` [PATCH 07/52] fuse: export fuse_len_args() Vivek Goyal
2018-12-10 17:12 ` [PATCH 08/52] fuse: add fuse_iqueue_ops callbacks Vivek Goyal
2018-12-10 17:12 ` [PATCH 09/52] fuse: process requests queues Vivek Goyal
2018-12-10 17:12 ` [PATCH 10/52] fuse: export fuse_get_unique() Vivek Goyal
2018-12-10 17:12 ` Vivek Goyal [this message]
2018-12-10 17:12 ` [PATCH 12/52] virtio_fs: Set up dax_device Vivek Goyal
2018-12-10 17:12 ` [PATCH 13/52] dax: remove block device dependencies Vivek Goyal
2018-12-10 17:12 ` [PATCH 14/52] fuse: add fuse_conn->dax_dev field Vivek Goyal
2018-12-10 17:12 ` [PATCH 15/52] fuse: map virtio_fs DAX window BAR Vivek Goyal
2018-12-12 16:37   ` Christian Borntraeger
2018-12-13 11:55     ` Stefan Hajnoczi
2018-12-13 16:06   ` kbuild test robot
2018-12-13 19:55   ` Dan Williams
2018-12-13 20:09     ` Dr. David Alan Gilbert
2018-12-13 20:15       ` Dan Williams
2018-12-13 20:40         ` Vivek Goyal
2018-12-13 21:18           ` Vivek Goyal
2018-12-14 10:09             ` Dr. David Alan Gilbert
2018-12-10 17:12 ` [PATCH 16/52] virtio-fs: Add VIRTIO_PCI_CAP_SHARED_MEMORY_CFG and utility to find them Vivek Goyal
2018-12-12 16:36   ` [PATCH] virtio-fs: fix semicolon.cocci warnings kbuild test robot
2018-12-12 16:36   ` [PATCH 16/52] virtio-fs: Add VIRTIO_PCI_CAP_SHARED_MEMORY_CFG and utility to find them kbuild test robot
2018-12-10 17:12 ` [PATCH 17/52] virtio-fs: Retrieve shm capabilities for cache Vivek Goyal
2018-12-10 17:12 ` [PATCH 18/52] virtio-fs: Map cache using the values from the capabilities Vivek Goyal
2018-12-13  9:10   ` David Hildenbrand
2018-12-13  9:13     ` Dr. David Alan Gilbert
2018-12-13  9:34       ` David Hildenbrand
2018-12-13 10:00         ` Dr. David Alan Gilbert
2018-12-13 11:26           ` David Hildenbrand
2018-12-13 12:15             ` Dr. David Alan Gilbert
2018-12-13 12:24               ` David Hildenbrand
2018-12-13 12:38                 ` Cornelia Huck
2018-12-14 13:44                   ` Stefan Hajnoczi
2018-12-14 13:50                     ` Cornelia Huck
2018-12-14 14:06                       ` Dr. David Alan Gilbert
2018-12-17 11:25                       ` Stefan Hajnoczi
2018-12-17 10:53                     ` David Hildenbrand
2018-12-17 14:56                       ` Stefan Hajnoczi
2018-12-18 17:13                         ` Cornelia Huck
2018-12-18 17:25                           ` David Hildenbrand
2019-01-02 10:24                             ` Stefan Hajnoczi
2019-03-17  0:33   ` Liu Bo
2019-03-20 10:42     ` Dr. David Alan Gilbert
2019-03-17  0:35   ` [PATCH] virtio-fs: fix multiple tag support Liu Bo
2019-03-19 20:26     ` Vivek Goyal
2019-03-20  2:04       ` Liu Bo
2018-12-10 17:12 ` [PATCH 19/52] virito-fs: Make dax optional Vivek Goyal
2018-12-10 17:12 ` [PATCH 20/52] Limit number of pages returned by direct_access() Vivek Goyal
2018-12-10 17:12 ` [PATCH 21/52] fuse: Introduce fuse_dax_mapping Vivek Goyal
2018-12-10 17:12 ` [PATCH 22/52] Create a list of free memory ranges Vivek Goyal
2018-12-11 17:44   ` kbuild test robot
2018-12-15 19:22   ` kbuild test robot
2018-12-10 17:12 ` [PATCH 23/52] fuse: simplify fuse_fill_super_common() calling Vivek Goyal
2018-12-10 17:12 ` [PATCH 24/52] fuse: Introduce setupmapping/removemapping commands Vivek Goyal
2018-12-10 17:12 ` [PATCH 25/52] Introduce interval tree basic data structures Vivek Goyal
2018-12-10 17:12 ` [PATCH 26/52] fuse: Implement basic DAX read/write support commands Vivek Goyal
2018-12-10 17:12 ` [PATCH 27/52] fuse: Maintain a list of busy elements Vivek Goyal
2018-12-10 17:12 ` [PATCH 28/52] Do fallocate() to grow file before mapping for file growing writes Vivek Goyal
2018-12-11  6:13   ` kbuild test robot
2018-12-11  6:20   ` kbuild test robot
2018-12-10 17:12 ` [PATCH 29/52] fuse: add DAX mmap support Vivek Goyal
2018-12-10 17:12 ` [PATCH 30/52] fuse: delete dentry if timeout is zero Vivek Goyal
2018-12-10 17:12 ` [PATCH 31/52] dax: Pass dax_dev to dax_writeback_mapping_range() Vivek Goyal
2018-12-11  6:12   ` kbuild test robot
2018-12-11 17:38   ` kbuild test robot
2018-12-10 17:12 ` [PATCH 32/52] fuse: Define dax address space operations Vivek Goyal
2018-12-10 17:12 ` [PATCH 33/52] fuse, dax: Take ->i_mmap_sem lock during dax page fault Vivek Goyal
2018-12-10 17:13 ` [PATCH 34/52] fuse: Add logic to free up a memory range Vivek Goyal
2018-12-10 17:13 ` [PATCH 35/52] fuse: Add logic to do direct reclaim of memory Vivek Goyal
2018-12-10 17:13 ` [PATCH 36/52] fuse: Kick worker when free memory drops below 20% of total ranges Vivek Goyal
2018-12-10 17:13 ` [PATCH 37/52] fuse: multiplex cached/direct_io/dax file operations Vivek Goyal
2018-12-10 17:13 ` [PATCH 38/52] Dispatch FORGET requests later instead of dropping them Vivek Goyal
2018-12-10 17:13 ` [PATCH 39/52] Release file in process context Vivek Goyal
2018-12-10 17:13 ` [PATCH 40/52] fuse: Do not block on inode lock while freeing memory range Vivek Goyal
2018-12-10 17:13 ` [PATCH 41/52] fuse: Reschedule dax free work if too many EAGAIN attempts Vivek Goyal
2018-12-10 17:13 ` [PATCH 42/52] fuse: Wait for memory ranges to become free Vivek Goyal
2018-12-10 17:13 ` [PATCH 43/52] fuse: Take inode lock for dax inode truncation Vivek Goyal
2018-12-10 17:13 ` [PATCH 44/52] fuse: Clear setuid bit even in direct I/O path Vivek Goyal
2018-12-10 17:13 ` [PATCH 45/52] virtio: Free fuse devices on umount Vivek Goyal
2018-12-10 17:13 ` [PATCH 46/52] virtio-fs: Retrieve shm capabilities for version table Vivek Goyal
2018-12-10 17:13 ` [PATCH 47/52] virtio-fs: Map using the values from the capabilities Vivek Goyal
2018-12-10 17:13 ` [PATCH 48/52] virtio-fs: pass version table pointer to fuse Vivek Goyal
2018-12-10 17:13 ` [PATCH 49/52] fuse: don't crash if version table is NULL Vivek Goyal
2018-12-10 17:13 ` [PATCH 50/52] fuse: add shared version support (virtio-fs only) Vivek Goyal
2018-12-10 17:13 ` [PATCH 51/52] fuse: shared version cleanups Vivek Goyal
2018-12-10 17:13 ` [PATCH 52/52] fuse: fix fuse_permission() for the default_permissions case Vivek Goyal
2018-12-19 21:25   ` kbuild test robot
2018-12-11 12:54 ` [PATCH 00/52] [RFC] virtio-fs: shared file system for virtual machines Stefan Hajnoczi
2018-12-12 20:30 ` Konrad Rzeszutek Wilk
2018-12-12 21:22   ` Vivek Goyal
2019-02-12 15:56 ` Aneesh Kumar K.V
2019-02-12 18:57   ` Vivek Goyal

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