521 lines
13 KiB
C
521 lines
13 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratories.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)pack.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/param.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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/*
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* Packing. We have three separate kinds of packing here.
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*
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* First, we pack device instances, to collapse things like
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*
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* uba0 at sbi0 nexus ?
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* uba0 at bi0 nexus ?
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*
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* into a single instance that is "at sbi0 or bi0".
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*
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* Second, we pack locators. Given something like
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*
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* hp0 at mba0 drive 0
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* hp* at mba* drive ?
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* ht0 at mba0 drive 0
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* tu0 at ht0 slave 0
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* ht* at mba* drive ?
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* tu* at ht* slave ?
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*
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* (where the default drive and slave numbers are -1), we have three
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* locators whose value is 0 and three whose value is -1. Rather than
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* emitting six integers, we emit just two.
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*
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* Finally, we pack parent vectors. This is very much like packing
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* locators. Unlike locators, however, parent vectors are always
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* terminated by -1 (rather like the way C strings always end with
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* a NUL).
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*
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* When packing locators, we would like to find sequences such as
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* {1 2 3} {2 3 4} {3} {4 5}
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* and turn this into the flat sequence {1 2 3 4 5}, with each subsequence
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* given by the appropriate offset (here 0, 1, 2, and 3 respectively).
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* When we pack parent vectors, overlap of this sort is impossible.
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* Non-overlapping packing is much easier, and so we use that here
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* and miss out on the chance to squeeze the locator sequence optimally.
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* (So it goes.)
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*/
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typedef int (*vec_cmp_func) __P((const void *, int, int));
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#define TAILHSIZE 128
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#define PVHASH(i) ((i) & (TAILHSIZE - 1))
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#define LOCHASH(l) (((int)(l) >> 2) & (TAILHSIZE - 1))
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struct tails {
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struct tails *t_next;
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int t_ends_at;
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};
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static struct tails *tails[TAILHSIZE];
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static int locspace;
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static int pvecspace;
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static int longest_pvec;
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static void packdevi __P((void));
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static void packlocs __P((void));
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static void packpvec __P((void));
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static void addparents __P((struct devi *src, struct devi *dst));
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static int nparents __P((struct devi **, struct devbase *, int));
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static int sameas __P((struct devi *, struct devi *));
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static int findvec __P((const void *, int, int, vec_cmp_func, int));
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static int samelocs __P((const void *, int, int));
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static int addlocs __P((const char **, int));
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static int loclencmp __P((const void *, const void *));
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static int samepv __P((const void *, int, int));
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static int addpv __P((short *, int));
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static int pvlencmp __P((const void *, const void *));
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static void resettails __P((void));
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void
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pack()
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{
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register struct devi *i;
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register int n;
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/* Pack instances and make parent vectors. */
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packdevi();
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/*
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* Now that we know what we have, find upper limits on space
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* needed for the loc[] and pv[] tables, and find the longest
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* single pvec. The loc and pv table sizes are bounded by
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* what we would get if no packing occurred.
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*/
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locspace = pvecspace = 0;
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for (i = alldevi; i != NULL; i = i->i_next) {
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if (i->i_collapsed)
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continue;
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locspace += i->i_atattr->a_loclen;
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n = i->i_pvlen + 1;
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if (n > longest_pvec)
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longest_pvec = n;
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pvecspace += n;
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}
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/* Allocate and pack loc[]. */
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locators.vec = emalloc(locspace * sizeof(*locators.vec));
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locators.used = 0;
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packlocs();
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/* Allocate and pack pv[]. */
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parents.vec = emalloc(pvecspace * sizeof(*parents.vec));
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parents.used = 0;
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packpvec();
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}
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/*
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* Pack instances together wherever possible. When everything is
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* packed, go back and set up the parents for each. We must do this
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* on a second pass because during the first one, we do not know which,
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* if any, of the parents will collapse during packing.
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*/
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void
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packdevi()
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{
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register struct devi *i, *l, *p;
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register struct devbase *d;
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register int j, m, n;
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packed = emalloc((ndevi + 1) * sizeof *packed);
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n = 0;
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for (d = allbases; d != NULL; d = d->d_next) {
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/*
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* For each instance of each device, add or collapse
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* all its aliases.
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*/
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for (i = d->d_ihead; i != NULL; i = i->i_bsame) {
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m = n;
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for (l = i; l != NULL; l = l->i_alias) {
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l->i_pvlen = 0;
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l->i_pvoff = -1;
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l->i_locoff = -1;
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l->i_ivoff = -1;
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/* try to find an equivalent for l */
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for (j = m; j < n; j++) {
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p = packed[j];
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if (sameas(l, p)) {
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l->i_collapsed = 1;
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l->i_cfindex = p->i_cfindex;
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goto nextalias;
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}
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}
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/* could not find a suitable alias */
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l->i_collapsed = 0;
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l->i_cfindex = n;
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l->i_parents = emalloc(sizeof(*l->i_parents));
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l->i_parents[0] = NULL;
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packed[n++] = l;
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nextalias:;
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}
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}
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}
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npacked = n;
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packed[n] = NULL;
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for (i = alldevi; i != NULL; i = i->i_next)
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addparents(i, packed[i->i_cfindex]);
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}
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/*
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* Return true if two aliases are "the same". In this case, they need
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* to have the same config flags and the same locators.
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*/
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static int
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sameas(i1, i2)
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register struct devi *i1, *i2;
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{
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register const char **p1, **p2;
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if (i1->i_cfflags != i2->i_cfflags)
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return (0);
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for (p1 = i1->i_locs, p2 = i2->i_locs; *p1 == *p2; p2++)
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if (*p1++ == 0)
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return (1);
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return 0;
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}
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/*
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* Add the parents associated with "src" to the (presumably uncollapsed)
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* instance "dst".
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*/
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static void
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addparents(src, dst)
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register struct devi *src, *dst;
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{
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register struct nvlist *nv;
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register struct devi *i, **p, **q;
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register int j, n, old, new, ndup;
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if (dst->i_collapsed)
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panic("addparents() i_collapsed");
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/* Collect up list of parents to add. */
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if (src->i_at == NULL) /* none, 'cuz "at root" */
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return;
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if (src->i_atdev != NULL) {
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n = nparents(NULL, src->i_atdev, src->i_atunit);
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p = emalloc(n * sizeof *p);
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if (n == 0)
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return;
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(void)nparents(p, src->i_atdev, src->i_atunit);
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} else {
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n = 0;
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for (nv = src->i_atattr->a_refs; nv != NULL; nv = nv->nv_next)
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n += nparents(NULL, nv->nv_ptr, src->i_atunit);
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if (n == 0)
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return;
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p = emalloc(n * sizeof *p);
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n = 0;
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for (nv = src->i_atattr->a_refs; nv != NULL; nv = nv->nv_next)
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n += nparents(p + n, nv->nv_ptr, src->i_atunit);
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}
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/* Now elide duplicates. */
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ndup = 0;
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for (j = 0; j < n; j++) {
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i = p[j];
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for (q = dst->i_parents; *q != NULL; q++) {
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if (*q == i) {
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ndup++;
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p[j] = NULL;
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break;
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}
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}
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}
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/* Finally, add all the non-duplicates. */
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old = dst->i_pvlen;
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new = old + (n - ndup);
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if (old > new)
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panic("addparents() old > new");
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if (old == new) {
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free(p);
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return;
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}
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dst->i_parents = q = erealloc(dst->i_parents, (new + 1) * sizeof(*q));
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dst->i_pvlen = new;
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q[new] = NULL;
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q += old;
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for (j = 0; j < n; j++)
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if (p[j] != NULL)
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*q++ = p[j];
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free(p);
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}
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/*
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* Count up parents, and optionally store pointers to each.
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*/
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static int
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nparents(p, dev, unit)
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register struct devi **p;
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register struct devbase *dev;
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register int unit;
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{
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register struct devi *i, *l;
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register int n;
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n = 0;
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/* for each instance ... */
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for (i = dev->d_ihead; i != NULL; i = i->i_bsame) {
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/* ... take each un-collapsed alias */
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for (l = i; l != NULL; l = l->i_alias) {
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if (!l->i_collapsed &&
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(unit == WILD || unit == l->i_unit)) {
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if (p != NULL)
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*p++ = l;
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n++;
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}
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}
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}
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return (n);
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}
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static void
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packlocs()
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{
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register struct devi **p, *i;
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register int l, o;
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qsort(packed, npacked, sizeof *packed, loclencmp);
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for (p = packed; (i = *p) != NULL; p++) {
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if ((l = i->i_atattr->a_loclen) > 0) {
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o = findvec(i->i_locs, LOCHASH(i->i_locs[l - 1]), l,
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samelocs, locators.used);
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i->i_locoff = o < 0 ? addlocs(i->i_locs, l) : o;
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} else
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i->i_locoff = -1;
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}
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resettails();
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}
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static void
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packpvec()
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{
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register struct devi **p, *i, **par;
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register int l, v, o;
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register short *vec;
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vec = emalloc(longest_pvec * sizeof(*vec));
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qsort(packed, npacked, sizeof *packed, pvlencmp);
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for (p = packed; (i = *p) != NULL; p++) {
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l = i->i_pvlen;
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if (l > longest_pvec) panic("packpvec");
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par = i->i_parents;
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for (v = 0; v < l; v++)
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vec[v] = par[v]->i_cfindex;
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if (l == 0 ||
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(o = findvec(vec, PVHASH(vec[l - 1]), l,
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samepv, parents.used)) < 0)
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o = addpv(vec, l);
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i->i_pvoff = o;
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}
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free(vec);
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resettails();
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}
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/*
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* Return the index at which the given vector already exists, or -1
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* if it is not anywhere in the current set. If we return -1, we assume
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* our caller will add it at the end of the current set, and we make
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* sure that next time, we will find it there.
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*/
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static int
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findvec(ptr, hash, len, cmp, nextplace)
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const void *ptr;
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int hash, len;
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vec_cmp_func cmp;
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int nextplace;
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{
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register struct tails *t, **hp;
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register int off;
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hp = &tails[hash];
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for (t = *hp; t != NULL; t = t->t_next) {
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off = t->t_ends_at - len;
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if (off >= 0 && (*cmp)(ptr, off, len))
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return (off);
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}
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t = emalloc(sizeof(*t));
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t->t_next = *hp;
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*hp = t;
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t->t_ends_at = nextplace + len;
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return (-1);
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}
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/*
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* Comparison function for locators.
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*/
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static int
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samelocs(ptr, off, len)
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const void *ptr;
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int off;
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register int len;
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{
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register const char **p, **q;
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for (p = &locators.vec[off], q = (const char **)ptr; --len >= 0;)
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if (*p++ != *q++)
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return (0); /* different */
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return (1); /* same */
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}
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/*
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* Add the given locators at the end of the global loc[] table.
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*/
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static int
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addlocs(locs, len)
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register const char **locs;
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register int len;
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{
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register const char **p;
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register int ret;
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ret = locators.used;
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if ((locators.used = ret + len) > locspace)
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panic("addlocs: overrun");
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for (p = &locators.vec[ret]; --len >= 0;)
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*p++ = *locs++;
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return (ret);
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}
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/*
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* Comparison function for qsort-by-locator-length, longest first.
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* We rashly assume that subtraction of these lengths does not overflow.
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*/
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static int
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loclencmp(a, b)
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const void *a, *b;
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{
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register int l1, l2;
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l1 = (*(struct devi **)a)->i_atattr->a_loclen;
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l2 = (*(struct devi **)b)->i_atattr->a_loclen;
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return (l2 - l1);
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}
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/*
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* Comparison function for parent vectors.
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*/
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static int
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samepv(ptr, off, len)
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const void *ptr;
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int off;
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register int len;
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{
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register short *p, *q;
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for (p = &parents.vec[off], q = (short *)ptr; --len >= 0;)
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if (*p++ != *q++)
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return (0); /* different */
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return (1); /* same */
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}
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/*
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* Add the given parent vectors at the end of the global pv[] table.
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*/
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static int
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addpv(pv, len)
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register short *pv;
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register int len;
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{
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register short *p;
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register int ret;
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static int firstend = -1;
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/*
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* If the vector is empty, reuse the first -1. It will be
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* there if there are any nonempty vectors at all, since we
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* do the longest first. If there are no nonempty vectors,
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* something is probably wrong, but we will ignore that here.
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*/
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if (len == 0 && firstend >= 0)
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return (firstend);
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len++; /* account for trailing -1 */
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ret = parents.used;
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if ((parents.used = ret + len) > pvecspace)
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panic("addpv: overrun");
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for (p = &parents.vec[ret]; --len > 0;)
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*p++ = *pv++;
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*p = -1;
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if (firstend < 0)
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firstend = parents.used - 1;
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return (ret);
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}
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/*
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* Comparison function for qsort-by-parent-vector-length, longest first.
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* We rashly assume that subtraction of these lengths does not overflow.
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*/
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static int
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pvlencmp(a, b)
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const void *a, *b;
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{
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register int l1, l2;
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l1 = (*(struct devi **)a)->i_pvlen;
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l2 = (*(struct devi **)b)->i_pvlen;
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return (l2 - l1);
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}
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static void
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resettails()
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{
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register struct tails **p, *t, *next;
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register int i;
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for (p = tails, i = TAILHSIZE; --i >= 0; p++) {
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for (t = *p; t != NULL; t = next) {
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next = t->t_next;
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free(t);
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}
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*p = NULL;
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}
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}
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