Re: flushing HFS cache to disk
Re: flushing HFS cache to disk
- Subject: Re: flushing HFS cache to disk
- From: Shantonu Sen <email@hidden>
- Date: Tue, 29 Nov 2005 09:39:03 -0800
that's what sync(2) does.
What information in particular do you not think is getting flushed to
disk. And why in the world are you accessing the filesystem through
the raw device instead of the mounted filesystem. Even if you sync
(2), you're never going to get a coherent snapshot of the filesystem
that is mounted read/write.
Shantonu
On Nov 29, 2005, at 2:38 AM, email@hidden wrote:
In order to read _current_ HFS data from a mounted disk we need to
flush the HFS cache to disk before we start to read.
- Calling sync() does not do the job - data on disk is not updated
with HFS cache.
- Opening the disk with open("/dev/rdsk0s10", O_RDWR) or (open("/",
O_RDWR) and calling fsync(diskfd) or ioctl(diskfd,
DKIOCSYNCHRONIZECACHE) does not do it - data on disk is not updated
with HFS cache.
- Starting Disk Utility does the job - afterwards the HFS data on
disk is updated with current information.
Any idea how Disk Utility forces to flush the HFS cache to disk,
and how we can do it in our code (without having to start Disk
Utility ;-))?
Thanks,
Uwe Gohlke
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