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file-win32: Support BDRV_REQ_ZERO_WRITE for truncate

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When using bdrv_file, .bdrv_has_zero_init_truncate always returns 1;
therefore, we can behave just like file-posix, and always implement
BDRV_REQ_ZERO_WRITE by ignoring it since the OS gives it to us for
free (note that file-posix.c had to use an 'if' because it shared code
between regular files and block devices, but in file-win32.c,
bdrv_host_device uses a separate .bdrv_file_open).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-3-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-04-28 15:28:58 -05:00 committed by Kevin Wolf
parent 5e09bcee5b
commit 8e51979504
1 changed files with 3 additions and 0 deletions
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block/file-win32.c
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@ -408,6 +408,9 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
}
/* When extending regular files, we get zeros from the OS */
bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
ret = 0;
fail:
qemu_opts_del(opts);