Just a small update, I understand from HFS+ spec that I can simply create a RAM disk and this bit will probably be set automatically.
If that's the case, then the solution is to create a RAM disk and copy the contents to it bypassing the cache. However, I'd prefer to be based on .dmg based filesystem. is it possible ? thanks, Irad On Mon, Apr 30, 2018 at 2:17 PM, Irad K <iradizat...@gmail.com> wrote: > I've created empty HFS+ filesystem represented by dmg image file. For > security reasons I'd like to make sure every IO applies directly to the dmg > file and not through any kind of memory in the middle. > > Is there any way to cancel the option for read and write caching while > mounting the filesystem? > > During my research about this theme, I've discovered that HFS+ header > contain attributes field, and one of its containing bits in volume > attributes field named kHFSVolumeNoCacheRequiredBit. It set if we want > that blocks from this volume wouldn't not be cached, which is pretty much > what I need. However, i don't have a clue about how to set it on. > > Any idea how to configure this volume properly (command-line, application, > API, etc .. ) ? > > thanks, > > Irad >
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