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assemblers/qemu/loop: open backing file O_DIRECT

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This should improve performance and save memory as we don't need two
page caches.

Signed-off-by: Tom Gundersen <teg@jklm.no>
This commit is contained in:
Tom Gundersen 2019-10-02 14:24:55 +02:00 • committed by Lars Karlitski
parent f470c3f3a3
commit 816d111779
1 changed files with 1 additions and 1 deletions
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2
assemblers/org.osbuild.qemu
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@ -27,7 +27,7 @@ def mount_api(dest):
@contextlib.contextmanager
def loop_device(loop_client, image, size, offset=0):
fd = os.open(image, os.O_RDWR)
fd = os.open(image, os.O_RDWR | os.O_DIRECT)
devname = loop_client.create_device(fd, offset=offset, sizelimit=size)
os.close(fd)
path = f"/dev/{devname}"