Subject: Re: Pending entries support for fileassoc(9)
To: Andrew Doran <email@example.com>
From: Brett Lymn <firstname.lastname@example.org>
Date: 12/05/2007 10:15:48
On Tue, Dec 04, 2007 at 10:23:51PM +0000, Andrew Doran wrote:
> - What is the concurrency strategy (e.g. locking)?
Locking would be good here and, tagentially, in Veriexec too.
1) Add a lock so we can lock the fileassoc_pending list for
read/write both when adding and when traversing in
2) I have not looked closely but if it is not already locked, lock
the vnode of the mount point so that no other operations can happen
while resolving the pending fileassoc entries.
Also, it looks like there is a bit of a race/hole when adding entries,
if the file system is already mounted and for some silly reason
fileassoc_add_pending() is called with a filename on that mounted
system then it will sit in the pending list forever - there probably
should be a check to see if the filesystem is already mounted prior to
adding the entry to the list.
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