From: Maxim Levitsky <mlevitsk@redhat.com>
Date: Wed, 11 Nov 2020 15:39:12 +0000 (+0200)
Subject: file-posix: allow -EBUSY errors during write zeros on raw block devices
X-Git-Tag: qemu-xen-4.16.0-rc4~478^2~4
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ece4fa9152ea37c7ebd158af330e3b20e33cf385;p=qemu-xen.git

file-posix: allow -EBUSY errors during write zeros on raw block devices

On Linux, fallocate(fd, FALLOC_FL_PUNCH_HOLE) when it is used on a block device,
without O_DIRECT can return -EBUSY if it races with another write to the same page.

Since this is rare and discard is not a critical operation, ignore this error

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20201111153913.41840-2-mlevitsk@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---

diff --git a/block/file-posix.c b/block/file-posix.c
index c63926d592..d5fd1dbcd2 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1698,6 +1698,7 @@ static int handle_aiocb_write_zeroes_unmap(void *opaque)
     switch (ret) {
     case -ENOTSUP:
     case -EINVAL:
+    case -EBUSY:
         break;
     default:
         return ret;