site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Hi Shawn, I am basically looking for the mechanism of locking the I/O's at file system level (VFS level) for a fraction of time so that i can copy out the specific data block for achieving the block level Snapshot on Mac OS X. And after initializing the Meta data for my module we will release the IO (unlock) the file system. The same patch is available in Linux LVM where they support Snapshot after applying the VFS lock Patch. My basic intension is to see if this lock is supported by Mac OS X VFS layer, if not how should we approach to write this VFS lock Patch in MAC OS X Darwin kernel. I am familiar with some part of VFS layer in Darwin kernel of Mac OS X. Thanks in Advance. YOGESH PAHILWAN (SOFTWARE ENGINNER) S P Software Technologies (I) Pvt. Ltd. (An ISO 9001:2000 Company) Pune, Maharashtra, India - 411 004. Tel : 91-20-4006154, 4006983, 4007503. Fax : 91-20-4006153. Email : pahilwan.yogesh@spsoftindia.com Visit us at : www.spsoftindia.com On Mon, 2005-01-10 at 22:59, Shawn Erickson wrote:

On Jan 9, 2005, at 10:06 PM, Yogesh P wrote:

...

Hi Folks,

I am working on the VFS-Lock patch available for linux which is use to get the functionality of locking and unlocking the filesystem.

Is anyone is working on to get the same functionality on MAC OS X which makes the filesystem lock unlock????

Is darwin kernel has some kind of mechanism for locking or unlocking the filesystem???

Any pointers,reply certainly helps.

Can you better online what you mean by lock/unlock. Locks out IO, Locks out fs changes, etc. What is the main goal for this product, what type of feature are you trying to allow?

Note that on Mac OS X the swap space is made of files in the boot file system (by default) and it is dynamic, files can come and go as swap needs change.

-Shawn

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