[Devel] [PATCH 1/2] fs/fuse kio: fix FALLOC_FL_ZERO_RANGE outside end of file

[Alexey Kuznetsov]

Ack to both patches

On Wed, Jun 5, 2019 at 6:50 PM Pavel Butsykin <pbutsykin at virtuozzo.com> wrote:
>
> Fallocate FALLOC_FL_ZERO_RANGE beyond end of file should change the file size.
>
> #VSTOR-23781
>
> Signed-off-by: Pavel Butsykin <pbutsykin at virtuozzo.com>
> ---
>  fs/fuse/kio/pcs/pcs_fuse_kdirect.c | 27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
>
> diff --git a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
> index 0d8cb3a751e2..60c47aaf592e 100644
> --- a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
> +++ b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
> @@ -858,7 +858,7 @@ static bool kqueue_insert(struct pcs_dentry_info *di, struct fuse_file *ff,
>  }
>
>  static inline int req_wait_grow_queue(struct pcs_fuse_req *r,
> -                                     struct fuse_file *ff, u16 type,
> +                                     struct fuse_file *ff,
>                                       off_t offset, size_t size)
>  {
>         struct pcs_dentry_info *di = get_pcs_inode(r->req.io_inode);
> @@ -866,7 +866,6 @@ static inline int req_wait_grow_queue(struct pcs_fuse_req *r,
>         if (!kqueue_insert(di, ff, &r->req))
>                 return -EIO;
>
> -       pcs_fuse_prep_io(r, type, offset, size, 0);
>         inode_dio_begin(r->req.io_inode);
>         wait_grow(r, di, offset + size);
>         return 1;
> @@ -922,8 +921,9 @@ static int pcs_fuse_prep_rw(struct pcs_fuse_req *r, struct fuse_file *ff)
>                 struct fuse_write_in *in = &req->misc.write.in;
>
>                 if (in->offset + in->size > di->fileinfo.attr.size) {
> -                       ret = req_wait_grow_queue(r, ff, PCS_REQ_T_WRITE,
> -                                                 in->offset, in->size);
> +                       pcs_fuse_prep_io(r, PCS_REQ_T_WRITE, in->offset,
> +                                        in->size, 0);
> +                       ret = req_wait_grow_queue(r, ff, in->offset, in->size);
>                         goto pending;
>                 }
>                 spin_unlock(&di->lock);
> @@ -957,25 +957,28 @@ static int pcs_fuse_prep_rw(struct pcs_fuse_req *r, struct fuse_file *ff)
>         }
>         case FUSE_FALLOCATE: {
>                 struct fuse_fallocate_in const *in = req->in.args[0].value;
> -               u16 type;
> +               u16 type = PCS_REQ_T_MAX;
>
>                 if (in->mode & FALLOC_FL_PUNCH_HOLE)
>                         type = PCS_REQ_T_WRITE_HOLE;
>                 else if (in->mode & FALLOC_FL_ZERO_RANGE)
>                         type = PCS_REQ_T_WRITE_ZERO;
> -               else {
> -                       ret = -EPERM;
> -                       goto fail;
> -               }
>
>                 if (in->offset + in->length > di->fileinfo.attr.size) {
> -                       ret = req_wait_grow_queue(r, ff, type, in->offset,
> -                                                 in->length);
> +                       if (type < PCS_REQ_T_MAX)
> +                               pcs_fuse_prep_io(r, type, in->offset,
> +                                                in->length, 0);
> +                       else
> +                               pcs_fuse_prep_fallocate(r);
> +                       ret = req_wait_grow_queue(r, ff, in->offset, in->length);
>                         goto pending;
>                 }
>                 spin_unlock(&di->lock);
>
> -               pcs_fuse_prep_io(r, type, in->offset, in->length, 0);
> +               if (type < PCS_REQ_T_MAX)
> +                       pcs_fuse_prep_io(r, type, in->offset, in->length, 0);
> +               else
> +                       return -EPERM; /* NOPE */
>                 break;
>         }
>         default:
> --
> 2.15.1
>