Re: [V9fs-developer] [GIT PULL] 9p file system bug fixes for 2.6.35-rc2

From: Linus Torvalds
Date: Wed Jun 30 2010 - 14:31:52 EST

On Wed, Jun 30, 2010 at 11:16 AM, Latchesar Ionkov <lucho@xxxxxxxxxx> wrote:
> I think that you need to use the s_vfs_rename_mutex in the super_block
> struct instead of introducing a new rename_lock in the v9fs session.

I actually think it's better to avoid having filesystems muck around
with VFS locking details. Also, I think we get the VFS rename mutex
only for cross-directory renames, and as mentioned, 9p needs locking
even for regular directory renames.

(Also, this way you can have parallel readers - although we could
obviously change the vfs rename mutex into a rw-sem too).

So I do think that keeping the logic private to a 9p-specific lock is
the right solution here.

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