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block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers

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Filter drivers that support .bdrv_co_pwrite_zeroes can safely advertise
BDRV_REQ_NO_FALLBACK because they just forward the request flags to
their child node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2019-03-22 13:42:39 +01:00
parent fe0480d629
commit 80f5c33ff3
4 changed files with 7 additions and 7 deletions
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2
block/blkdebug.c
View File

@ -401,7 +401,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
(BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
ret = -EINVAL;

7
block/copy-on-read.c
View File

@ -34,12 +34,11 @@ static int cor_open(BlockDriverState *bs, QDict *options, int flags,
}
bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
(BDRV_REQ_FUA &
bs->file->bs->supported_write_flags);
(BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
bs->file->bs->supported_zero_flags);
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
return 0;
}

3
block/mirror.c
View File

@ -1548,7 +1548,8 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
}
mirror_top_bs->total_sectors = bs->total_sectors;
mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED;
mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED;
mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
BDRV_REQ_NO_FALLBACK;
bs_opaque = g_new0(MirrorBDSOpaque, 1);
mirror_top_bs->opaque = bs_opaque;
bdrv_set_aio_context(mirror_top_bs, bdrv_get_aio_context(bs));

2
block/raw-format.c
View File

@ -434,7 +434,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
(BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
if (bs->probed && !bdrv_is_read_only(bs)) {