bug fixes extracted from larger qcow2 zero bit work

[PATCH v2 4/4] sheepdog: Consistently set bdrv_has_zero_init_truncate

Posted by Eric Blake 5 years, 6 months ago

block_int.h claims that .bdrv_has_zero_init must return 0 if
.bdrv_has_zero_init_truncate does likewise; but this is violated if
only the former callback is provided if .bdrv_co_truncate also exists.
When adding the latter callback, it was mistakenly added to only one
of the three possible sheepdog instantiations.

Fixes: 1dcaf527
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 block/sheepdog.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index cfa84338a2d6..522c16a93676 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -3269,6 +3269,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
     .bdrv_co_create               = sd_co_create,
     .bdrv_co_create_opts          = sd_co_create_opts,
     .bdrv_has_zero_init           = bdrv_has_zero_init_1,
+    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
     .bdrv_getlength               = sd_getlength,
     .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
     .bdrv_co_truncate             = sd_co_truncate,
@@ -3307,6 +3308,7 @@ static BlockDriver bdrv_sheepdog_unix = {
     .bdrv_co_create               = sd_co_create,
     .bdrv_co_create_opts          = sd_co_create_opts,
     .bdrv_has_zero_init           = bdrv_has_zero_init_1,
+    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
     .bdrv_getlength               = sd_getlength,
     .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
     .bdrv_co_truncate             = sd_co_truncate,
-- 
2.26.0.rc2

Re: [PATCH v2 4/4] sheepdog: Consistently set bdrv_has_zero_init_truncate

Posted by John Snow 5 years, 6 months ago


On 3/24/20 1:42 PM, Eric Blake wrote:
> block_int.h claims that .bdrv_has_zero_init must return 0 if
> .bdrv_has_zero_init_truncate does likewise; but this is violated if
> only the former callback is provided if .bdrv_co_truncate also exists.
> When adding the latter callback, it was mistakenly added to only one
> of the three possible sheepdog instantiations.
> 
> Fixes: 1dcaf527
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>  block/sheepdog.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/block/sheepdog.c b/block/sheepdog.c
> index cfa84338a2d6..522c16a93676 100644
> --- a/block/sheepdog.c
> +++ b/block/sheepdog.c
> @@ -3269,6 +3269,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
>      .bdrv_co_create               = sd_co_create,
>      .bdrv_co_create_opts          = sd_co_create_opts,
>      .bdrv_has_zero_init           = bdrv_has_zero_init_1,
> +    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
>      .bdrv_getlength               = sd_getlength,
>      .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
>      .bdrv_co_truncate             = sd_co_truncate,
> @@ -3307,6 +3308,7 @@ static BlockDriver bdrv_sheepdog_unix = {
>      .bdrv_co_create               = sd_co_create,
>      .bdrv_co_create_opts          = sd_co_create_opts,
>      .bdrv_has_zero_init           = bdrv_has_zero_init_1,
> +    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
>      .bdrv_getlength               = sd_getlength,
>      .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
>      .bdrv_co_truncate             = sd_co_truncate,
> 

Reviewed-by: John Snow <jsnow@redhat.com>

Re: [PATCH-for-5.0 v2 4/4] sheepdog: Consistently set bdrv_has_zero_init_truncate

Posted by Philippe Mathieu-Daudé 5 years, 6 months ago

On 3/24/20 6:42 PM, Eric Blake wrote:
> block_int.h claims that .bdrv_has_zero_init must return 0 if
> .bdrv_has_zero_init_truncate does likewise; but this is violated if
> only the former callback is provided if .bdrv_co_truncate also exists.
> When adding the latter callback, it was mistakenly added to only one
> of the three possible sheepdog instantiations.
> 
> Fixes: 1dcaf527
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>   block/sheepdog.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/block/sheepdog.c b/block/sheepdog.c
> index cfa84338a2d6..522c16a93676 100644
> --- a/block/sheepdog.c
> +++ b/block/sheepdog.c
> @@ -3269,6 +3269,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
>       .bdrv_co_create               = sd_co_create,
>       .bdrv_co_create_opts          = sd_co_create_opts,
>       .bdrv_has_zero_init           = bdrv_has_zero_init_1,
> +    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
>       .bdrv_getlength               = sd_getlength,
>       .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
>       .bdrv_co_truncate             = sd_co_truncate,
> @@ -3307,6 +3308,7 @@ static BlockDriver bdrv_sheepdog_unix = {
>       .bdrv_co_create               = sd_co_create,
>       .bdrv_co_create_opts          = sd_co_create_opts,
>       .bdrv_has_zero_init           = bdrv_has_zero_init_1,
> +    .bdrv_has_zero_init_truncate  = bdrv_has_zero_init_1,
>       .bdrv_getlength               = sd_getlength,
>       .bdrv_get_allocated_file_size = sd_get_allocated_file_size,
>       .bdrv_co_truncate             = sd_co_truncate,
> 

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>