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Diffstat (limited to 'lkm/vinum/lock.c')
| -rw-r--r-- | lkm/vinum/lock.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/lkm/vinum/lock.c b/lkm/vinum/lock.c deleted file mode 100644 index ed69649..0000000 --- a/lkm/vinum/lock.c +++ /dev/null @@ -1,137 +0,0 @@ -/*- - * Copyright (c) 1997, 1998 - * Nan Yang Computer Services Limited. All rights reserved. - * - * This software is distributed under the so-called ``Berkeley - * License'': - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Nan Yang Computer - * Services Limited. - * 4. Neither the name of the Company nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * This software is provided ``as is'', and any express or implied - * warranties, including, but not limited to, the implied warranties of - * merchantability and fitness for a particular purpose are disclaimed. - * In no event shall the company or contributors be liable for any - * direct, indirect, incidental, special, exemplary, or consequential - * damages (including, but not limited to, procurement of substitute - * goods or services; loss of use, data, or profits; or business - * interruption) however caused and on any theory of liability, whether - * in contract, strict liability, or tort (including negligence or - * otherwise) arising in any way out of the use of this software, even if - * advised of the possibility of such damage. - * - * $Id: lock.c,v 1.6 1998/07/28 06:32:57 grog Exp grog $ - */ - -#define REALLYKERNEL -#include "vinumhdr.h" - -/* Lock routines. Currently, we lock either an individual volume - * or the global configuration. I don't think tsleep and - * wakeup are SMP safe. FIXME XXX */ - -/* Lock a volume, wait if it's in use */ -int -lockvol(struct volume *vol) -{ - int error; - - while ((vol->flags & VF_LOCKED) != 0) { - vol->flags |= VF_LOCKING; - /* It would seem to make more sense to sleep on - * the address 'vol'. Unfortuntaly we can't - * guarantee that this address won't change due to - * table expansion. The address we choose won't change. */ - if ((error = tsleep(&vinum_conf.volume + vol->devno, - PRIBIO | PCATCH, - "volock", - 0)) != 0) - return error; - } - vol->flags |= VF_LOCKED; - return 0; -} - -/* Unlock a volume and let the next one at it */ -void -unlockvol(struct volume *vol) -{ - vol->flags &= ~VF_LOCKED; - if ((vol->flags & VF_LOCKING) != 0) { - vol->flags &= ~VF_LOCKING; - wakeup(&vinum_conf.volume + vol->devno); - } -} - -/* Lock a plex, wait if it's in use */ -int -lockplex(struct plex *plex) -{ - int error; - - while ((plex->flags & VF_LOCKED) != 0) { - plex->flags |= VF_LOCKING; - /* It would seem to make more sense to sleep on - * the address 'plex'. Unfortuntaly we can't - * guarantee that this address won't change due to - * table expansion. The address we choose won't change. */ - if ((error = tsleep(&vinum_conf.plex + plex->sdnos[0], - PRIBIO | PCATCH, - "plexlk", - 0)) != 0) - return error; - } - plex->flags |= VF_LOCKED; - return 0; -} - -/* Unlock a plex and let the next one at it */ -void -unlockplex(struct plex *plex) -{ - plex->flags &= ~VF_LOCKED; - if ((plex->flags & VF_LOCKING) != 0) { - plex->flags &= ~VF_LOCKING; - wakeup(&vinum_conf.plex + plex->plexno); - } -} - - -/* Get a lock for the global config, wait if it's not available */ -int -lock_config(void) -{ - int error; - - while ((vinum_conf.flags & VF_LOCKED) != 0) { - vinum_conf.flags |= VF_LOCKING; - if ((error = tsleep(&vinum_conf, PRIBIO | PCATCH, "vincfg", 0)) != 0) - return error; - } - vinum_conf.flags |= VF_LOCKED; - return 0; -} - -/* Unlock and wake up any waiters */ -void -unlock_config(void) -{ - vinum_conf.flags &= ~VF_LOCKED; - if ((vinum_conf.flags & VF_LOCKING) != 0) { - vinum_conf.flags &= ~VF_LOCKING; - wakeup(&vinum_conf); - } -} |
