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block: Add flags to BlockDriver.bdrv_co_truncate()

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This adds a new BdrvRequestFlags parameter to the .bdrv_co_truncate()
driver callbacks, and a supported_truncate_flags field in
BlockDriverState that allows drivers to advertise support for request
flags in the context of truncate.

For now, we always pass 0 and no drivers declare support for any flag.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200424125448.63318-2-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-04-24 14:54:39 +02:00
parent 3fb6108707
commit 92b92799dc
15 changed files with 33 additions and 13 deletions
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10
include/block/block_int.h
View file

@ -355,7 +355,7 @@ struct BlockDriver {
*/
int coroutine_fn (*bdrv_co_truncate)(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp);
BdrvRequestFlags flags, Error **errp);
int64_t (*bdrv_getlength)(BlockDriverState *bs);
bool has_variable_length;
@ -847,6 +847,14 @@ struct BlockDriverState {
/* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
* BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */
unsigned int supported_zero_flags;
/*
* Flags honoured during truncate (so far: BDRV_REQ_ZERO_WRITE).
*
* If BDRV_REQ_ZERO_WRITE is given, the truncate operation must make sure
* that any added space reads as all zeros. If this can't be guaranteed,
* the operation must fail.
*/
unsigned int supported_truncate_flags;
/* the following member gives a name to every node on the bs graph. */
char node_name[32];