Re: [Qemu-devel] [PATCH 14/36] migration: use qemu_file_get_error() return value when possible

[Anthony Liguori <anthony@codemonkey.ws>]

On 10/11/2011 05:00 AM, Juan Quintela wrote:
> Signed-off-by: Juan Quintela<quintela@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   arch_init.c       |    6 ++++--
>   block-migration.c |    7 ++++---
>   buffered_file.c   |   13 ++++++++-----
>   savevm.c          |    4 ++--
>   4 files changed, 18 insertions(+), 12 deletions(-)
>
> diff --git a/arch_init.c b/arch_init.c
> index 9128be0..98daaf3 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -371,6 +371,7 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
>   {
>       ram_addr_t addr;
>       int flags;
> +    int error;
>
>       if (version_id<  3 || version_id>  4) {
>           return -EINVAL;
> @@ -451,8 +452,9 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
>
>               qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
>           }
> -        if (qemu_file_get_error(f)) {
> -            return -EIO;
> +        error = qemu_file_get_error(f);
> +        if (error) {
> +            return error;
>           }
>       } while (!(flags&  RAM_SAVE_FLAG_EOS));
>
> diff --git a/block-migration.c b/block-migration.c
> index 8308753..e36f2e3 100644
> --- a/block-migration.c
> +++ b/block-migration.c
> @@ -646,6 +646,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
>       uint8_t *buf;
>       int64_t total_sectors = 0;
>       int nr_sectors;
> +    int ret;
>
>       do {
>           addr = qemu_get_be64(f);
> @@ -654,7 +655,6 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
>           addr>>= BDRV_SECTOR_BITS;
>
>           if (flags&  BLK_MIG_FLAG_DEVICE_BLOCK) {
> -            int ret;
>               /* get device name */
>               len = qemu_get_byte(f);
>               qemu_get_buffer(f, (uint8_t *)device_name, len);
> @@ -704,8 +704,9 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
>               fprintf(stderr, "Unknown flags\n");
>               return -EINVAL;
>           }
> -        if (qemu_file_get_error(f)) {
> -            return -EIO;
> +        ret = qemu_file_get_error(f);
> +        if (ret != 0) {
> +            return ret;
>           }
>       } while (!(flags&  BLK_MIG_FLAG_EOS));
>
> diff --git a/buffered_file.c b/buffered_file.c
> index 82f4001..42bbbd3 100644
> --- a/buffered_file.c
> +++ b/buffered_file.c
> @@ -71,9 +71,11 @@ static void buffered_append(QEMUFileBuffered *s,
>   static void buffered_flush(QEMUFileBuffered *s)
>   {
>       size_t offset = 0;
> +    int error;
>
> -    if (qemu_file_get_error(s->file)) {
> -        DPRINTF("flush when error, bailing\n");
> +    error = qemu_file_get_error(s->file);
> +    if (error != 0) {
> +        DPRINTF("flush when error, bailing: %s\n", strerror(-error));
>           return;
>       }
>
> @@ -108,13 +110,14 @@ static void buffered_flush(QEMUFileBuffered *s)
>   static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
>   {
>       QEMUFileBuffered *s = opaque;
> -    int offset = 0;
> +    int offset = 0, error;
>       ssize_t ret;
>
>       DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
>
> -    if (qemu_file_get_error(s->file)) {
> -        DPRINTF("flush when error, bailing\n");
> +    error = qemu_file_get_error(s->file);
> +    if (error) {
> +        DPRINTF("flush when error, bailing: %s\n", strerror(-error));
>           return -EINVAL;
>       }
>
> diff --git a/savevm.c b/savevm.c
> index 69a2ccd..3042ae5 100644
> --- a/savevm.c
> +++ b/savevm.c
> @@ -1835,8 +1835,8 @@ out:
>           g_free(le);
>       }
>
> -    if (qemu_file_get_error(f)) {
> -        ret = -EIO;
> +    if (ret == 0) {
> +        ret = qemu_file_get_error(f);
>       }
>
>       return ret;