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[Qemu-devel] [Bug 1776920] Re: qemu-img convert on Mac OSX creates corru
From: |
Yan-Jie Wang |
Subject: |
[Qemu-devel] [Bug 1776920] Re: qemu-img convert on Mac OSX creates corrupt images |
Date: |
Fri, 07 Sep 2018 18:04:14 -0000 |
I have done some experiments and find out that
the behavior of lseek with whence set to SEEK_DATA is different from the
behavior of Linux's lseek.
If the supplied offset is in the middle of a data region, it returns the
start of the next data region. There may be many data regions in a big
file even though it has no hole.
return value of lseek with whence set to SEEK_DATA:
|--(offset)--Data----|(return value)----Data----|
|--(offset)--Data----|----Hole----|(return value)----Data----|
** Patch added: "macOS-lseek.patch"
https://bugs.launchpad.net/qemu/+bug/1776920/+attachment/5186138/+files/macOS-lseek.patch
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https://bugs.launchpad.net/bugs/1776920
Title:
qemu-img convert on Mac OSX creates corrupt images
Status in QEMU:
New
Bug description:
An image created by qemu-img create, then modified by another program
is converted to bad/corrupt image when using convert sub command on
Mac OSX. The same convert works on Linux. The version of qemu-img is
2.12.
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- [Qemu-devel] [Bug 1776920] Re: qemu-img convert on Mac OSX creates corrupt images,
Yan-Jie Wang <=