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Re: hfs+ read only over fibre channel
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Re: hfs+ read only over fibre channel


  • Subject: Re: hfs+ read only over fibre channel
  • From: Mark Day <email@hidden>
  • Date: Mon, 2 Jul 2007 16:09:37 -0700

Probably the closest you can get is to do an update mount, with the MNT_RELOAD flag also set. Use at your own risk. Changing the on-disk structures behind the file system's back is very risky; you could corrupt the file system and lose data. This is not the right way to hook multiple machines up to a SAN.

-Mark

On Jul 2, 2007, at 3:51 PM, Brian Sturk wrote:

Not sure if this is the right mailing list for this sort of question.
If not I'll ask on the appropriate list.

I'm trying to force an HFS volume that is mounted read only to re-read
directory entries from disk (bypassing it's cache). I haven't found
anything at the VFS layer that allows me to do that (cache_purgevfs
etc). The VOP_READDIR path seems to go almost straight to the
underlying driver. Just looking for any pointers on how to accomplish
this if it can even be done. I know that re-mounting the volume
accomplishes this but I'm looking to do it *without* having to remount.


Having asked this I'm very aware of how dangerous this is i.e. reading
structures off the disk while another could be possibly writing to the disk.


Any info would be greatly appreciated!

~brian

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