2010/9/15 Kostik Belousov <kostik...@gmail.com>: > On Wed, Sep 15, 2010 at 02:24:21PM +0000, Attilio Rao wrote: >> Author: attilio >> Date: Wed Sep 15 14:24:21 2010 >> New Revision: 212661 >> URL: http://svn.freebsd.org/changeset/base/212661 >> >> Log: >> Fix bogus busying mechanism from cdevsw callbacks: >> - D_TRACKCLOSE may be used there as d_close() are expected to match up >> d_open() calls > VFS is not very good at properly calling VOP_CLOSE(). As example, premature > vnode reclaim due to devfs unmount would cause VOP_CLOSE() to be called > only once despite the number of opens being > 1.
Yes. That makes implementing a similar semantic in drivers very difficult and not very well fixable, in particular within the d_* callbacks. I'm seriously wondering if we might just make a shortcut just for supporting such a feature (busying the device on real devfs entry activity) as several of them may be needing and may be probabilly needing to be 100%. Luckilly, it seems that such paths are not experienced very frequently. Attilio -- Peace can only be achieved by understanding - A. Einstein _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
