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Re: [Qemu-devel] [PATCH 31/38] ivshmem: Inline check_shm_size() into its
From: |
Marc-André Lureau |
Subject: |
Re: [Qemu-devel] [PATCH 31/38] ivshmem: Inline check_shm_size() into its only caller |
Date: |
Wed, 2 Mar 2016 19:49:16 +0100 |
Hi
On Mon, Feb 29, 2016 at 7:40 PM, Markus Armbruster <address@hidden> wrote:
> Improve the error messages while there.
>
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
I am not convinced this improves readibility much, I would cleanup a
bit the function, but keep it.
> hw/misc/ivshmem.c | 37 +++++++++++--------------------------
> 1 file changed, 11 insertions(+), 26 deletions(-)
>
> diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> index 0440bca..785ed1c 100644
> --- a/hw/misc/ivshmem.c
> +++ b/hw/misc/ivshmem.c
> @@ -342,29 +342,6 @@ static void watch_vector_notifier(IVShmemState *s,
> EventNotifier *n,
> NULL, &s->msi_vectors[vector]);
> }
>
> -static int check_shm_size(IVShmemState *s, int fd, Error **errp)
> -{
> - /* check that the guest isn't going to try and map more memory than the
> - * the object has allocated return -1 to indicate error */
> -
> - struct stat buf;
> -
> - if (fstat(fd, &buf) < 0) {
> - error_setg(errp, "exiting: fstat on fd %d failed: %s",
> - fd, strerror(errno));
> - return -1;
> - }
> -
> - if (s->ivshmem_size > buf.st_size) {
> - error_setg(errp, "Requested memory size greater"
> - " than shared object size (%zu > %" PRIu64")",
> - s->ivshmem_size, (uint64_t)buf.st_size);
> - return -1;
> - } else {
> - return 0;
> - }
> -}
> -
> static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
> {
> memory_region_add_eventfd(&s->ivshmem_mmio,
> @@ -479,7 +456,7 @@ static void setup_interrupt(IVShmemState *s, int vector,
> Error **errp)
>
> static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
> {
> - Error *err = NULL;
> + struct stat buf;
> void *ptr;
>
> if (s->ivshmem_bar2) {
> @@ -488,8 +465,16 @@ static void process_msg_shmem(IVShmemState *s, int fd,
> Error **errp)
> return;
> }
>
> - if (check_shm_size(s, fd, &err) == -1) {
> - error_propagate(errp, err);
> + if (fstat(fd, &buf) < 0) {
> + error_setg_errno(errp, errno,
> + "can't determine size of shared memory sent by server");
> + close(fd);
> + return;
> + }
> +
> + if (s->ivshmem_size > buf.st_size) {
> + error_setg(errp, "server sent only %zd bytes of shared memory",
> + (size_t)buf.st_size);
> close(fd);
> return;
> }
> --
> 2.4.3
>
>
--
Marc-André Lureau
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