mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 22:10:24 +00:00
c41564b5af
these typos. SGI-PV: 904196 SGI-Modid: xfs-linux-melb:xfs-kern:25539a Signed-off-by: Nathan Scott <nathans@sgi.com>
204 lines
4.4 KiB
C
204 lines
4.4 KiB
C
/*
|
|
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "xfs.h"
|
|
|
|
/*
|
|
* Source file used to associate/disassociate behaviors with virtualized
|
|
* objects. See xfs_behavior.h for more information about behaviors, etc.
|
|
*
|
|
* The implementation is split between functions in this file and macros
|
|
* in xfs_behavior.h.
|
|
*/
|
|
|
|
/*
|
|
* Insert a new behavior descriptor into a behavior chain.
|
|
*
|
|
* The behavior chain is ordered based on the 'position' number which
|
|
* lives in the first field of the ops vector (higher numbers first).
|
|
*
|
|
* Attempts to insert duplicate ops result in an EINVAL return code.
|
|
* Otherwise, return 0 to indicate success.
|
|
*/
|
|
int
|
|
bhv_insert(bhv_head_t *bhp, bhv_desc_t *bdp)
|
|
{
|
|
bhv_desc_t *curdesc, *prev;
|
|
int position;
|
|
|
|
/*
|
|
* Validate the position value of the new behavior.
|
|
*/
|
|
position = BHV_POSITION(bdp);
|
|
ASSERT(position >= BHV_POSITION_BASE && position <= BHV_POSITION_TOP);
|
|
|
|
/*
|
|
* Find location to insert behavior. Check for duplicates.
|
|
*/
|
|
prev = NULL;
|
|
for (curdesc = bhp->bh_first;
|
|
curdesc != NULL;
|
|
curdesc = curdesc->bd_next) {
|
|
|
|
/* Check for duplication. */
|
|
if (curdesc->bd_ops == bdp->bd_ops) {
|
|
ASSERT(0);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Find correct position */
|
|
if (position >= BHV_POSITION(curdesc)) {
|
|
ASSERT(position != BHV_POSITION(curdesc));
|
|
break; /* found it */
|
|
}
|
|
|
|
prev = curdesc;
|
|
}
|
|
|
|
if (prev == NULL) {
|
|
/* insert at front of chain */
|
|
bdp->bd_next = bhp->bh_first;
|
|
bhp->bh_first = bdp;
|
|
} else {
|
|
/* insert after prev */
|
|
bdp->bd_next = prev->bd_next;
|
|
prev->bd_next = bdp;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove a behavior descriptor from a position in a behavior chain;
|
|
* the position is guaranteed not to be the first position.
|
|
* Should only be called by the bhv_remove() macro.
|
|
*/
|
|
void
|
|
bhv_remove_not_first(bhv_head_t *bhp, bhv_desc_t *bdp)
|
|
{
|
|
bhv_desc_t *curdesc, *prev;
|
|
|
|
ASSERT(bhp->bh_first != NULL);
|
|
ASSERT(bhp->bh_first->bd_next != NULL);
|
|
|
|
prev = bhp->bh_first;
|
|
for (curdesc = bhp->bh_first->bd_next;
|
|
curdesc != NULL;
|
|
curdesc = curdesc->bd_next) {
|
|
|
|
if (curdesc == bdp)
|
|
break; /* found it */
|
|
prev = curdesc;
|
|
}
|
|
|
|
ASSERT(curdesc == bdp);
|
|
prev->bd_next = bdp->bd_next; /* remove from after prev */
|
|
}
|
|
|
|
/*
|
|
* Look for a specific ops vector on the specified behavior chain.
|
|
* Return the associated behavior descriptor. Or NULL, if not found.
|
|
*/
|
|
bhv_desc_t *
|
|
bhv_lookup(bhv_head_t *bhp, void *ops)
|
|
{
|
|
bhv_desc_t *curdesc;
|
|
|
|
for (curdesc = bhp->bh_first;
|
|
curdesc != NULL;
|
|
curdesc = curdesc->bd_next) {
|
|
|
|
if (curdesc->bd_ops == ops)
|
|
return curdesc;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Looks for the first behavior within a specified range of positions.
|
|
* Return the associated behavior descriptor. Or NULL, if none found.
|
|
*/
|
|
bhv_desc_t *
|
|
bhv_lookup_range(bhv_head_t *bhp, int low, int high)
|
|
{
|
|
bhv_desc_t *curdesc;
|
|
|
|
for (curdesc = bhp->bh_first;
|
|
curdesc != NULL;
|
|
curdesc = curdesc->bd_next) {
|
|
|
|
int position = BHV_POSITION(curdesc);
|
|
|
|
if (position <= high) {
|
|
if (position >= low)
|
|
return curdesc;
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return the base behavior in the chain, or NULL if the chain
|
|
* is empty.
|
|
*
|
|
* The caller has not read locked the behavior chain, so acquire the
|
|
* lock before traversing the chain.
|
|
*/
|
|
bhv_desc_t *
|
|
bhv_base(bhv_head_t *bhp)
|
|
{
|
|
bhv_desc_t *curdesc;
|
|
|
|
for (curdesc = bhp->bh_first;
|
|
curdesc != NULL;
|
|
curdesc = curdesc->bd_next) {
|
|
|
|
if (curdesc->bd_next == NULL) {
|
|
return curdesc;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
bhv_head_init(
|
|
bhv_head_t *bhp,
|
|
char *name)
|
|
{
|
|
bhp->bh_first = NULL;
|
|
}
|
|
|
|
void
|
|
bhv_insert_initial(
|
|
bhv_head_t *bhp,
|
|
bhv_desc_t *bdp)
|
|
{
|
|
ASSERT(bhp->bh_first == NULL);
|
|
(bhp)->bh_first = bdp;
|
|
}
|
|
|
|
void
|
|
bhv_head_destroy(
|
|
bhv_head_t *bhp)
|
|
{
|
|
ASSERT(bhp->bh_first == NULL);
|
|
}
|