Re: [PATCH] virtio_fs: fix the hash table using in virtio_fs_enqueue_req()

[Stefan Hajnoczi]

On Thu, Jul 3, 2025 at 2:48 AM lirongqing <lirongqing@xxxxxxxxx> wrote:
>
> From: Li RongQing <lirongqing@xxxxxxxxx>
>
> The original commit be2ff42c5d6e ("fuse: Use hash table to link
> processing request") converted fuse_pqueue->processing to a hash table,
> but virtio_fs_enqueue_req() was not updated to use it correctly.
> So use fuse_pqueue->processing as a hash table, this make the code
> more coherent
>
> Co-developed-by: Fushuai Wang <wangfushuai@xxxxxxxxx>
> Signed-off-by: Fushuai Wang <wangfushuai@xxxxxxxxx>
> Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
> ---
>  fs/fuse/dev.c       | 1 +
>  fs/fuse/virtio_fs.c | 6 ++++--
>  2 files changed, 5 insertions(+), 2 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>

>
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index e80cd8f..4659bc8 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -322,6 +322,7 @@ unsigned int fuse_req_hash(u64 unique)
>  {
>         return hash_long(unique & ~FUSE_INT_REQ_BIT, FUSE_PQ_HASH_BITS);
>  }
> +EXPORT_SYMBOL_GPL(fuse_req_hash);
>
>  /*
>   * A new request is available, wake fiq->waitq
> diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
> index b8a99d3..d050470 100644
> --- a/fs/fuse/virtio_fs.c
> +++ b/fs/fuse/virtio_fs.c
> @@ -21,6 +21,7 @@
>  #include <linux/cleanup.h>
>  #include <linux/uio.h>
>  #include "fuse_i.h"
> +#include "fuse_dev_i.h"
>
>  /* Used to help calculate the FUSE connection's max_pages limit for a request's
>   * size. Parts of the struct fuse_req are sliced into scattergather lists in
> @@ -1382,7 +1383,7 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
>         unsigned int out_sgs = 0;
>         unsigned int in_sgs = 0;
>         unsigned int total_sgs;
> -       unsigned int i;
> +       unsigned int i, hash;
>         int ret;
>         bool notify;
>         struct fuse_pqueue *fpq;
> @@ -1442,8 +1443,9 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
>
>         /* Request successfully sent. */
>         fpq = &fsvq->fud->pq;
> +       hash = fuse_req_hash(req->in.h.unique);
>         spin_lock(&fpq->lock);
> -       list_add_tail(&req->list, fpq->processing);
> +       list_add_tail(&req->list, &fpq->processing[hash]);
>         spin_unlock(&fpq->lock);
>         set_bit(FR_SENT, &req->flags);
>         /* matches barrier in request_wait_answer() */
> --
> 2.9.4
>
>