site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Scanning the code, i didn't see the exact functionality that you'll need; vfs_busy() was as close as it gets, and fails; it uses the mnt_lock in the mount struct.. On Jan 10, 2005, at 11:13 PM, Yogesh P wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... 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. This email sent to site_archiver@lists.apple.com