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block: Add PreallocMode to BD.bdrv_truncate()

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Add a PreallocMode parameter to the bdrv_truncate() function implemented
by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no
driver accepts anything else.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-06-13 22:20:52 +02:00
parent 32a1681adc
commit 8243ccb743
14 changed files with 98 additions and 15 deletions
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8
block/crypto.c
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@ -361,12 +361,18 @@ static int block_crypto_create_generic(QCryptoBlockFormat format,
}
static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
Error **errp)
PreallocMode prealloc, Error **errp)
{
BlockCrypto *crypto = bs->opaque;
size_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block);
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
offset += payload_offset;
return bdrv_truncate(bs->file, offset, errp);