[PATCH] virtiofs: use GFP_NOFS when enqueuing request through kworker

[PATCH] virtiofs: use GFP_NOFS when enqueuing request through kworker

[Hou Tao]

From: Hou Tao <houtao1@huawei.com>

When invoking virtio_fs_enqueue_req() through kworker, both the
allocation of the sg array and the bounce buffer still use GFP_ATOMIC.
Considering the size of both the sg array and the bounce buffer may be
greater than PAGE_SIZE, use GFP_NOFS instead of GFP_ATOMIC to lower the
possibility of memory allocation failure.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 fs/fuse/virtio_fs.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 3aac31d45198..ec4d0d81a5e2 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -87,7 +87,8 @@ struct virtio_fs_req_work {
 };
 
 static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
-				 struct fuse_req *req, bool in_flight);
+				 struct fuse_req *req, bool in_flight,
+				 bool in_atomic);
 
 static const struct constant_table dax_param_enums[] = {
 	{"always",	FUSE_DAX_ALWAYS },
@@ -383,7 +384,7 @@ static void virtio_fs_request_dispatch_work(struct work_struct *work)
 		list_del_init(&req->list);
 		spin_unlock(&fsvq->lock);
 
-		ret = virtio_fs_enqueue_req(fsvq, req, true);
+		ret = virtio_fs_enqueue_req(fsvq, req, true, false);
 		if (ret < 0) {
 			if (ret == -ENOMEM || ret == -ENOSPC) {
 				spin_lock(&fsvq->lock);
@@ -488,7 +489,7 @@ static void virtio_fs_hiprio_dispatch_work(struct work_struct *work)
 }
 
 /* Allocate and copy args into req->argbuf */
-static int copy_args_to_argbuf(struct fuse_req *req)
+static int copy_args_to_argbuf(struct fuse_req *req, gfp_t gfp)
 {
 	struct fuse_args *args = req->args;
 	unsigned int offset = 0;
@@ -502,7 +503,7 @@ static int copy_args_to_argbuf(struct fuse_req *req)
 	len = fuse_len_args(num_in, (struct fuse_arg *) args->in_args) +
 	      fuse_len_args(num_out, args->out_args);
 
-	req->argbuf = kmalloc(len, GFP_ATOMIC);
+	req->argbuf = kmalloc(len, gfp);
 	if (!req->argbuf)
 		return -ENOMEM;
 
@@ -1119,7 +1120,8 @@ static unsigned int sg_init_fuse_args(struct scatterlist *sg,
 
 /* Add a request to a virtqueue and kick the device */
 static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
-				 struct fuse_req *req, bool in_flight)
+				 struct fuse_req *req, bool in_flight,
+				 bool in_atomic)
 {
 	/* requests need at least 4 elements */
 	struct scatterlist *stack_sgs[6];
@@ -1128,6 +1130,7 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
 	struct scatterlist *sg = stack_sg;
 	struct virtqueue *vq;
 	struct fuse_args *args = req->args;
+	gfp_t gfp = in_atomic ? GFP_ATOMIC : GFP_NOFS;
 	unsigned int argbuf_used = 0;
 	unsigned int out_sgs = 0;
 	unsigned int in_sgs = 0;
@@ -1140,8 +1143,8 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
 	/* Does the sglist fit on the stack? */
 	total_sgs = sg_count_fuse_req(req);
 	if (total_sgs > ARRAY_SIZE(stack_sgs)) {
-		sgs = kmalloc_array(total_sgs, sizeof(sgs[0]), GFP_ATOMIC);
-		sg = kmalloc_array(total_sgs, sizeof(sg[0]), GFP_ATOMIC);
+		sgs = kmalloc_array(total_sgs, sizeof(sgs[0]), gfp);
+		sg = kmalloc_array(total_sgs, sizeof(sg[0]), gfp);
 		if (!sgs || !sg) {
 			ret = -ENOMEM;
 			goto out;
@@ -1149,7 +1152,7 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
 	}
 
 	/* Use a bounce buffer since stack args cannot be mapped */
-	ret = copy_args_to_argbuf(req);
+	ret = copy_args_to_argbuf(req, gfp);
 	if (ret < 0)
 		goto out;
 
@@ -1245,7 +1248,7 @@ __releases(fiq->lock)
 		 fuse_len_args(req->args->out_numargs, req->args->out_args));
 
 	fsvq = &fs->vqs[queue_id];
-	ret = virtio_fs_enqueue_req(fsvq, req, false);
+	ret = virtio_fs_enqueue_req(fsvq, req, false, true);
 	if (ret < 0) {
 		if (ret == -ENOMEM || ret == -ENOSPC) {
 			/*
-- 
2.29.2

Re: [PATCH] virtiofs: use GFP_NOFS when enqueuing request through kworker

[Matthew Wilcox]

On Thu, Jan 04, 2024 at 09:58:05AM +0800, Hou Tao wrote:
>  static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
> -				 struct fuse_req *req, bool in_flight);
> +				 struct fuse_req *req, bool in_flight,
> +				 bool in_atomic);

Better to pass the gfp_t directly instead of a bool.