For Linux 5.10/5.11, qemu write zeros to a multipath device using ioctl(fd, BLKZEROOUT, range) with cache none or directsync return -EBUSY permanently. Fallback to pwritev instead of exit for -EBUSY error.
The issue was introduced in Linux 5.10: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=384d87ef2c954fc58e6c5fd8253e4a1984f5fe02 Fixed in Linux 5.12: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=56887cffe946bb0a90c74429fa94d6110a73119d Signed-off-by: ChangLimin <chan...@chinatelecom.cn> --- block/file-posix.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 20e14f8e96..d4054ac9cb 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1624,8 +1624,12 @@ 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; + switch (ret) { + case -ENOTSUP: + s->has_write_zeroes = false; /* fall through */ + case -EBUSY: /* Linux 5.10/5.11 may return -EBUSY for multipath devices */ + return -ENOTSUP; + break; } } #endif -- 2.27.0
