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file-posix: Fix has_write_zeroes after NO_FALLBACK 

If QEMU_AIO_NO_FALLBACK is given, we always return failure and don't
even try to use the BLKZEROOUT ioctl. In this failure case, we shouldn't
disable has_write_zeroes because we didn't learn anything about the
ioctl. The next request might not set QEMU_AIO_NO_FALLBACK and we can
still use the ioctl then.

Fixes: 738301e117
Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2019-08-16 11:48:17 +02:00
parent 6b9d62c2a9
commit effecce6bc
1 changed files with 3 additions and 3 deletions
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6
block/file-posix.c
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@ -1502,12 +1502,12 @@ static ssize_t handle_aiocb_write_zeroes_block(RawPosixAIOData *aiocb)
} while (errno == EINTR);
ret = translate_err(-errno);
if (ret == -ENOTSUP) {
s->has_write_zeroes = false;
}
}
#endif
if (ret == -ENOTSUP) {
s->has_write_zeroes = false;
}
return ret;
}