Re: [patch 38/52] fs: icache RCU free inodes

From: Nick Piggin
Date: Wed Jun 30 2010 - 10:33:47 EST

On Wed, Jun 30, 2010 at 06:57:11PM +1000, Dave Chinner wrote:
> On Thu, Jun 24, 2010 at 01:02:50PM +1000, npiggin@xxxxxxx wrote:
> > RCU free the struct inode. This will allow:
> Rather than what it will allow, what are the constraints this
> imposes on allocating and freeing a struct inode? e.g. XFS embeds
> the struct inode in a larger inode structure and does it's own
> allocation, caching and freeing of the larger structure outside of
> the VFS functionality.
> Does this need to be converted to RCU? Do we need to do more
> initialisation of the struct inode than we currently do? What
> functions/call chains now implicitly require RCU freeing semantics
> on the struct inode for safe operation? What else do we need to be
> aware of?

Yeah, filesystems with their own freeing functions will need to
do a call_rcu to free it (many are not converted). Otherwise,
there is nothing else to know. They could take advantage of RCU
if they would like though.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at