/* $NetBSD: sem.c,v 1.26 2007/01/08 16:08:08 cube Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratories. * * 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. Neither the name of the University 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 BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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. * * from: @(#)sem.c 8.1 (Berkeley) 6/6/93 */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include #include #include #include #include #include #include "defs.h" #include "sem.h" /* * config semantics. */ #define NAMESIZE 100 /* local name buffers */ const char *s_ifnet; /* magic attribute */ const char *s_qmark; const char *s_none; static struct hashtab *cfhashtab; /* for config lookup */ struct hashtab *devitab; /* etc */ static struct attr errattr; static struct devbase errdev; static struct deva errdeva; static int has_errobj(struct nvlist *, void *); static struct nvlist *addtoattr(struct nvlist *, struct devbase *); static int resolve(struct nvlist **, const char *, const char *, struct nvlist *, int); static struct pspec *getpspec(struct attr *, struct devbase *, int); static struct devi *newdevi(const char *, int, struct devbase *d); static struct devi *getdevi(const char *); static void remove_devi(struct devi *); static const char *concat(const char *, int); static char *extend(char *, const char *); static int split(const char *, size_t, char *, size_t, int *); static void selectbase(struct devbase *, struct deva *); static const char **fixloc(const char *, struct attr *, struct nvlist *); static const char *makedevstr(int, int); static const char *major2name(int); static int dev2major(struct devbase *); extern const char *yyfile; extern int vflag; void initsem(void) { attrtab = ht_new(); errattr.a_name = ""; TAILQ_INIT(&allbases); TAILQ_INIT(&alldevas); TAILQ_INIT(&allpspecs); cfhashtab = ht_new(); TAILQ_INIT(&allcf); TAILQ_INIT(&alldevi); errdev.d_name = ""; TAILQ_INIT(&allpseudo); TAILQ_INIT(&alldevms); s_ifnet = intern("ifnet"); s_qmark = intern("?"); s_none = intern("none"); } /* Name of include file just ended (set in scan.l) */ extern const char *lastfile; void enddefs(void) { struct devbase *dev; TAILQ_FOREACH(dev, &allbases, d_next) { if (!dev->d_isdef) { (void)fprintf(stderr, "%s: device `%s' used but not defined\n", lastfile, dev->d_name); errors++; continue; } } if (errors) { (void)fprintf(stderr, "*** Stop.\n"); exit(1); } } void setdefmaxusers(int min, int def, int max) { if (min < 1 || min > def || def > max) error("maxusers must have 1 <= min (%d) <= default (%d) <= max (%d)", min, def, max); else { minmaxusers = min; defmaxusers = def; maxmaxusers = max; } } void setmaxusers(int n) { if (maxusers == n) { error("duplicate maxusers parameter"); return; } if (vflag && maxusers != 0) warn("maxusers already defined"); maxusers = n; if (n < minmaxusers) { error("warning: minimum of %d maxusers assumed", minmaxusers); errors--; /* take it away */ maxusers = minmaxusers; } else if (n > maxmaxusers) { error("warning: maxusers (%d) > %d", n, maxmaxusers); errors--; } } void setident(const char *i) { ident = intern(i); } /* * Define an attribute, optionally with an interface (a locator list) * and a set of attribute-dependencies. * * Attribute dependencies MAY NOT be interface attributes. * * Since an empty locator list is logically different from "no interface", * all locator lists include a dummy head node, which we discard here. */ int defattr(const char *name, struct nvlist *locs, struct nvlist *deps, int devclass) { struct attr *a, *dep; struct nvlist *nv; int len; if (locs != NULL && devclass) panic("defattr(%s): locators and devclass", name); if (deps != NULL && devclass) panic("defattr(%s): dependencies and devclass", name); /* * If this attribute depends on any others, make sure none of * the dependencies are interface attributes. */ for (nv = deps; nv != NULL; nv = nv->nv_next) { dep = nv->nv_ptr; if (dep->a_iattr) { error("`%s' dependency `%s' is an interface attribute", name, dep->a_name); return (1); } } a = ecalloc(1, sizeof *a); if (ht_insert(attrtab, name, a)) { free(a); error("attribute `%s' already defined", name); nvfreel(locs); return (1); } a->a_name = name; if (locs != NULL) { a->a_iattr = 1; a->a_locs = locs->nv_next; nvfree(locs); } else { a->a_iattr = 0; a->a_locs = NULL; } if (devclass) { char classenum[256], *cp; int errored = 0; (void)snprintf(classenum, sizeof(classenum), "DV_%s", name); for (cp = classenum + 3; *cp; cp++) { if (!errored && (!isalnum((unsigned char)*cp) || (isalpha((unsigned char)*cp) && !islower((unsigned char)*cp)))) { error("device class names must be lower-case alphanumeric characters"); errored = 1; } *cp = toupper((unsigned char)*cp); } a->a_devclass = intern(classenum); } else a->a_devclass = NULL; len = 0; for (nv = a->a_locs; nv != NULL; nv = nv->nv_next) len++; a->a_loclen = len; a->a_devs = NULL; a->a_refs = NULL; a->a_deps = deps; a->a_expanding = 0; /* Expand the attribute to check for cycles in the graph. */ expandattr(a, NULL); return (0); } /* * Return true if the given `error object' is embedded in the given * pointer list. */ static int has_errobj(struct nvlist *nv, void *obj) { for (; nv != NULL; nv = nv->nv_next) if (nv->nv_ptr == obj) return (1); return (0); } /* * Return true if the given attribute is embedded in the given * pointer list. */ int has_attr(struct nvlist *nv, const char *attr) { struct attr *a; if ((a = getattr(attr)) == NULL) return (0); for (; nv != NULL; nv = nv->nv_next) if (nv->nv_ptr == a) return (1); return (0); } /* * Add a device base to a list in an attribute (actually, to any list). * Note that this does not check for duplicates, and does reverse the * list order, but no one cares anyway. */ static struct nvlist * addtoattr(struct nvlist *l, struct devbase *dev) { struct nvlist *n; n = newnv(NULL, NULL, dev, 0, l); return (n); } /* * Define a device. This may (or may not) also define an interface * attribute and/or refer to existing attributes. */ void defdev(struct devbase *dev, struct nvlist *loclist, struct nvlist *attrs, int ispseudo) { struct nvlist *nv; struct attr *a; if (dev == &errdev) goto bad; if (dev->d_isdef) { error("redefinition of `%s'", dev->d_name); goto bad; } dev->d_isdef = 1; if (has_errobj(attrs, &errattr)) goto bad; /* * Handle implicit attribute definition from locator list. Do * this before scanning the `at' list so that we can have, e.g.: * device foo at other, foo { slot = -1 } * (where you can plug in a foo-bus extender to a foo-bus). */ if (loclist != NULL) { nv = loclist; loclist = NULL; /* defattr disposes of them for us */ if (defattr(dev->d_name, nv, NULL, 0)) goto bad; attrs = newnv(dev->d_name, NULL, getattr(dev->d_name), 0, attrs); } /* * Pseudo-devices can have children. Consider them as * attaching at root. */ if (ispseudo) { for (nv = attrs; nv != NULL; nv = nv->nv_next) if (((struct attr *)(nv->nv_ptr))->a_iattr) break; if (nv != NULL) ht_insert(devroottab, dev->d_name, dev); } /* Committed! Set up fields. */ dev->d_ispseudo = ispseudo; dev->d_attrs = attrs; dev->d_classattr = NULL; /* for now */ /* * For each interface attribute this device refers to, add this * device to its reference list. This makes, e.g., finding all * "scsi"s easier. * * While looking through the attributes, set up the device * class if any are devclass attributes (and error out if the * device has two classes). */ for (nv = attrs; nv != NULL; nv = nv->nv_next) { a = nv->nv_ptr; if (a->a_iattr) a->a_refs = addtoattr(a->a_refs, dev); if (a->a_devclass != NULL) { if (dev->d_classattr != NULL) { error("device `%s' has multiple classes (`%s' and `%s')", dev->d_name, dev->d_classattr->a_name, a->a_name); } dev->d_classattr = a; } } return; bad: nvfreel(loclist); nvfreel(attrs); } /* * Look up a devbase. Also makes sure it is a reasonable name, * i.e., does not end in a digit or contain special characters. */ struct devbase * getdevbase(const char *name) { u_char *p; struct devbase *dev; p = (u_char *)name; if (!isalpha(*p)) goto badname; while (*++p) { if (!isalnum(*p) && *p != '_') goto badname; } if (isdigit(*--p)) { badname: error("bad device base name `%s'", name); return (&errdev); } dev = ht_lookup(devbasetab, name); if (dev == NULL) { dev = ecalloc(1, sizeof *dev); dev->d_name = name; dev->d_isdef = 0; dev->d_major = NODEV; dev->d_attrs = NULL; dev->d_ihead = NULL; dev->d_ipp = &dev->d_ihead; dev->d_ahead = NULL; dev->d_app = &dev->d_ahead; dev->d_umax = 0; TAILQ_INSERT_TAIL(&allbases, dev, d_next); if (ht_insert(devbasetab, name, dev)) panic("getdevbase(%s)", name); } return (dev); } /* * Define some of a device's allowable parent attachments. * There may be a list of (plain) attributes. */ void defdevattach(struct deva *deva, struct devbase *dev, struct nvlist *atlist, struct nvlist *attrs) { struct nvlist *nv; struct attr *a; struct deva *da; if (dev == &errdev) goto bad; if (deva == NULL) deva = getdevattach(dev->d_name); if (deva == &errdeva) goto bad; if (!dev->d_isdef) { error("attaching undefined device `%s'", dev->d_name); goto bad; } if (deva->d_isdef) { error("redefinition of `%s'", deva->d_name); goto bad; } if (dev->d_ispseudo) { error("pseudo-devices can't attach"); goto bad; } deva->d_isdef = 1; if (has_errobj(attrs, &errattr)) goto bad; for (nv = attrs; nv != NULL; nv = nv->nv_next) { a = nv->nv_ptr; if (a == &errattr) continue; /* already complained */ if (a->a_iattr || a->a_devclass != NULL) error("`%s' is not a plain attribute", a->a_name); } /* Committed! Set up fields. */ deva->d_attrs = attrs; deva->d_atlist = atlist; deva->d_devbase = dev; /* * Turn the `at' list into interface attributes (map each * nv_name to an attribute, or to NULL for root), and add * this device to those attributes, so that children can * be listed at this particular device if they are supported * by that attribute. */ for (nv = atlist; nv != NULL; nv = nv->nv_next) { if (nv->nv_name == NULL) nv->nv_ptr = a = NULL; /* at root */ else nv->nv_ptr = a = getattr(nv->nv_name); if (a == &errattr) continue; /* already complained */ /* * Make sure that an attachment spec doesn't * already say how to attach to this attribute. */ for (da = dev->d_ahead; da != NULL; da = da->d_bsame) if (onlist(da->d_atlist, a)) error("attach at `%s' already done by `%s'", a ? a->a_name : "root", da->d_name); if (a == NULL) { ht_insert(devroottab, dev->d_name, dev); continue; /* at root; don't add */ } if (!a->a_iattr) error("%s cannot be at plain attribute `%s'", dev->d_name, a->a_name); else a->a_devs = addtoattr(a->a_devs, dev); } /* attach to parent */ *dev->d_app = deva; dev->d_app = &deva->d_bsame; return; bad: nvfreel(atlist); nvfreel(attrs); } /* * Look up a device attachment. Also makes sure it is a reasonable * name, i.e., does not contain digits or special characters. */ struct deva * getdevattach(const char *name) { u_char *p; struct deva *deva; p = (u_char *)name; if (!isalpha(*p)) goto badname; while (*++p) { if (!isalnum(*p) && *p != '_') goto badname; } if (isdigit(*--p)) { badname: error("bad device attachment name `%s'", name); return (&errdeva); } deva = ht_lookup(devatab, name); if (deva == NULL) { deva = ecalloc(1, sizeof *deva); deva->d_name = name; deva->d_bsame = NULL; deva->d_isdef = 0; deva->d_devbase = NULL; deva->d_atlist = NULL; deva->d_attrs = NULL; deva->d_ihead = NULL; deva->d_ipp = &deva->d_ihead; TAILQ_INSERT_TAIL(&alldevas, deva, d_next); if (ht_insert(devatab, name, deva)) panic("getdeva(%s)", name); } return (deva); } /* * Look up an attribute. */ struct attr * getattr(const char *name) { struct attr *a; if ((a = ht_lookup(attrtab, name)) == NULL) { error("undefined attribute `%s'", name); a = &errattr; } return (a); } /* * Recursively expand an attribute and its dependencies, checking for * cycles, and invoking a callback for each attribute found. */ void expandattr(struct attr *a, void (*callback)(struct attr *)) { struct nvlist *nv; struct attr *dep; if (a->a_expanding) { error("circular dependency on attribute `%s'", a->a_name); return; } a->a_expanding = 1; /* First expand all of this attribute's dependencies. */ for (nv = a->a_deps; nv != NULL; nv = nv->nv_next) { dep = nv->nv_ptr; expandattr(dep, callback); } /* ...and now invoke the callback for ourself. */ if (callback != NULL) (*callback)(a); a->a_expanding = 0; } /* * Set the major device number for a device, so that it can be used * as a root/dumps "on" device in a configuration. */ void setmajor(struct devbase *d, int n) { if (d != &errdev && d->d_major != NODEV) error("device `%s' is already major %d", d->d_name, d->d_major); else d->d_major = n; } const char * major2name(int maj) { struct devbase *dev; struct devm *dm; if (!do_devsw) { TAILQ_FOREACH(dev, &allbases, d_next) { if (dev->d_major == maj) return (dev->d_name); } } else { TAILQ_FOREACH(dm, &alldevms, dm_next) { if (dm->dm_bmajor == maj) return (dm->dm_name); } } return (NULL); } int dev2major(struct devbase *dev) { struct devm *dm; if (!do_devsw) return (dev->d_major); TAILQ_FOREACH(dm, &alldevms, dm_next) { if (strcmp(dm->dm_name, dev->d_name) == 0) return (dm->dm_bmajor); } return (NODEV); } /* * Make a string description of the device at maj/min. */ static const char * makedevstr(int maj, int min) { const char *devname; char buf[32]; devname = major2name(maj); if (devname == NULL) (void)snprintf(buf, sizeof(buf), "<%d/%d>", maj, min); else (void)snprintf(buf, sizeof(buf), "%s%d%c", devname, min / maxpartitions, (min % maxpartitions) + 'a'); return (intern(buf)); } /* * Map things like "ra0b" => makedev(major("ra"), 0*maxpartitions + 'b'-'a'). * Handle the case where the device number is given but there is no * corresponding name, and map NULL to the default. */ static int resolve(struct nvlist **nvp, const char *name, const char *what, struct nvlist *dflt, int part) { struct nvlist *nv; struct devbase *dev; const char *cp; int maj, min, i, l; int unit; char buf[NAMESIZE]; if ((u_int)(part -= 'a') >= maxpartitions) panic("resolve"); if ((nv = *nvp) == NULL) { dev_t d = NODEV; /* * Apply default. Easiest to do this by number. * Make sure to retain NODEVness, if this is dflt's disposition. */ if (dflt->nv_int != NODEV) { maj = major(dflt->nv_int); min = ((minor(dflt->nv_int) / maxpartitions) * maxpartitions) + part; d = makedev(maj, min); cp = makedevstr(maj, min); } else cp = NULL; *nvp = nv = newnv(NULL, cp, NULL, d, NULL); } if (nv->nv_int != NODEV) { /* * By the numbers. Find the appropriate major number * to make a name. */ maj = major(nv->nv_int); min = minor(nv->nv_int); nv->nv_str = makedevstr(maj, min); return (0); } if (nv->nv_str == NULL || nv->nv_str == s_qmark) /* * Wildcarded or unspecified; leave it as NODEV. */ return (0); /* * The normal case: things like "ra2b". Check for partition * suffix, remove it if there, and split into name ("ra") and * unit (2). */ l = i = strlen(nv->nv_str); cp = &nv->nv_str[l]; if (l > 1 && *--cp >= 'a' && *cp < 'a' + maxpartitions && isdigit((unsigned char)cp[-1])) { l--; part = *cp - 'a'; } cp = nv->nv_str; if (split(cp, l, buf, sizeof buf, &unit)) { error("%s: invalid %s device name `%s'", name, what, cp); return (1); } dev = ht_lookup(devbasetab, intern(buf)); if (dev == NULL) { error("%s: device `%s' does not exist", name, buf); return (1); } /* * Check for the magic network interface attribute, and * don't bother making a device number. */ if (has_attr(dev->d_attrs, s_ifnet)) { nv->nv_int = NODEV; nv->nv_ifunit = unit; /* XXX XXX XXX */ } else { maj = dev2major(dev); if (maj == NODEV) { error("%s: can't make %s device from `%s'", name, what, nv->nv_str); return (1); } nv->nv_int = makedev(maj, unit * maxpartitions + part); } nv->nv_name = dev->d_name; return (0); } /* * Add a completed configuration to the list. */ void addconf(struct config *cf0) { struct config *cf; const char *name; name = cf0->cf_name; cf = ecalloc(1, sizeof *cf); if (ht_insert(cfhashtab, name, cf)) { error("configuration `%s' already defined", name); free(cf); goto bad; } *cf = *cf0; /* * Resolve the root device. */ if (cf->cf_root == NULL) { error("%s: no root device specified", name); goto bad; } if (cf->cf_root && cf->cf_root->nv_str != s_qmark) { struct nvlist *nv; nv = cf->cf_root; if (resolve(&cf->cf_root, name, "root", nv, 'a')) goto bad; } /* * Resolve the dump device. */ if (cf->cf_dump == NULL || cf->cf_dump->nv_str == s_qmark) { /* * Wildcarded dump device is equivalent to unspecified. */ cf->cf_dump = NULL; } else if (cf->cf_dump->nv_str == s_none) { /* * Operator has requested that no dump device should be * configured; do nothing. */ } else { if (resolve(&cf->cf_dump, name, "dumps", cf->cf_dump, 'b')) goto bad; } /* Wildcarded fstype is `unspecified'. */ if (cf->cf_fstype == s_qmark) cf->cf_fstype = NULL; TAILQ_INSERT_TAIL(&allcf, cf, cf_next); return; bad: nvfreel(cf0->cf_root); nvfreel(cf0->cf_dump); } void setconf(struct nvlist **npp, const char *what, struct nvlist *v) { if (*npp != NULL) { error("duplicate %s specification", what); nvfreel(v); } else *npp = v; } void delconf(const char *name) { struct config *cf; if (ht_lookup(cfhashtab, name) == NULL) { error("configuration `%s' undefined", name); return; } (void)ht_remove(cfhashtab, name); TAILQ_FOREACH(cf, &allcf, cf_next) if (!strcmp(cf->cf_name, name)) break; if (cf == NULL) panic("lost configuration `%s'", name); TAILQ_REMOVE(&allcf, cf, cf_next); } void setfstype(const char **fstp, const char *v) { if (*fstp != NULL) { error("multiple fstype specifications"); return; } if (v != s_qmark && OPT_FSOPT(v)) { error("\"%s\" is not a configured file system", v); return; } *fstp = v; } static struct devi * newdevi(const char *name, int unit, struct devbase *d) { struct devi *i; i = ecalloc(1, sizeof *i); i->i_name = name; i->i_unit = unit; i->i_base = d; i->i_bsame = NULL; i->i_asame = NULL; i->i_alias = NULL; i->i_at = NULL; i->i_pspec = NULL; i->i_atdeva = NULL; i->i_locs = NULL; i->i_cfflags = 0; i->i_lineno = currentline(); i->i_srcfile = yyfile; i->i_active = DEVI_ORPHAN; /* Proper analysis comes later */ i->i_level = devilevel; if (unit >= d->d_umax) d->d_umax = unit + 1; return (i); } /* * Add the named device as attaching to the named attribute (or perhaps * another device instead) plus unit number. */ void adddev(const char *name, const char *at, struct nvlist *loclist, int flags) { struct devi *i; /* the new instance */ struct pspec *p; /* and its pspec */ struct attr *attr; /* attribute that allows attach */ struct devbase *ib; /* i->i_base */ struct devbase *ab; /* not NULL => at another dev */ struct nvlist *nv; struct deva *iba; /* devbase attachment used */ const char *cp; int atunit; char atbuf[NAMESIZE]; int hit; ab = NULL; iba = NULL; if (at == NULL) { /* "at root" */ p = NULL; if ((i = getdevi(name)) == NULL) goto bad; /* * Must warn about i_unit > 0 later, after taking care of * the STAR cases (we could do non-star's here but why * bother?). Make sure this device can be at root. */ ib = i->i_base; hit = 0; for (iba = ib->d_ahead; iba != NULL; iba = iba->d_bsame) if (onlist(iba->d_atlist, NULL)) { hit = 1; break; } if (!hit) { error("`%s' cannot attach to the root", ib->d_name); i->i_active = DEVI_BROKEN; goto bad; } attr = &errattr; /* a convenient "empty" attr */ } else { if (split(at, strlen(at), atbuf, sizeof atbuf, &atunit)) { error("invalid attachment name `%s'", at); /* (void)getdevi(name); -- ??? */ goto bad; } if ((i = getdevi(name)) == NULL) goto bad; ib = i->i_base; /* * Devices can attach to two types of things: Attributes, * and other devices (which have the appropriate attributes * to allow attachment). * * (1) If we're attached to an attribute, then we don't need * look at the parent base device to see what attributes * it has, and make sure that we can attach to them. * * (2) If we're attached to a real device (i.e. named in * the config file), we want to remember that so that * at cross-check time, if the device we're attached to * is missing but other devices which also provide the * attribute are present, we don't get a false "OK." * * (3) If the thing we're attached to is an attribute * but is actually named in the config file, we still * have to remember its devbase. */ cp = intern(atbuf); /* Figure out parent's devbase, to satisfy case (3). */ ab = ht_lookup(devbasetab, cp); /* Find out if it's an attribute. */ attr = ht_lookup(attrtab, cp); /* Make sure we're _really_ attached to the attr. Case (1). */ if (attr != NULL && onlist(attr->a_devs, ib)) goto findattachment; /* * Else a real device, and not just an attribute. Case (2). * * Have to work a bit harder to see whether we have * something like "tg0 at esp0" (where esp is merely * not an attribute) or "tg0 at nonesuch0" (where * nonesuch is not even a device). */ if (ab == NULL) { error("%s at %s: `%s' unknown", name, at, atbuf); i->i_active = DEVI_BROKEN; goto bad; } /* * See if the named parent carries an attribute * that allows it to supervise device ib. */ for (nv = ab->d_attrs; nv != NULL; nv = nv->nv_next) { attr = nv->nv_ptr; if (onlist(attr->a_devs, ib)) goto findattachment; } error("`%s' cannot attach to `%s'", ib->d_name, atbuf); i->i_active = DEVI_BROKEN; goto bad; findattachment: /* * Find the parent spec. If a matching one has not yet been * created, create one. */ p = getpspec(attr, ab, atunit); p->p_devs = newnv(NULL, NULL, i, 0, p->p_devs); /* find out which attachment it uses */ hit = 0; for (iba = ib->d_ahead; iba != NULL; iba = iba->d_bsame) if (onlist(iba->d_atlist, attr)) { hit = 1; break; } if (!hit) panic("adddev: can't figure out attachment"); } if ((i->i_locs = fixloc(name, attr, loclist)) == NULL) { i->i_active = DEVI_BROKEN; goto bad; } i->i_at = at; i->i_pspec = p; i->i_atdeva = iba; i->i_cfflags = flags; *iba->d_ipp = i; iba->d_ipp = &i->i_asame; /* all done, fall into ... */ bad: nvfreel(loclist); return; } void deldevi(const char *name, const char *at) { struct devi *firsti, *i; struct devbase *d; int unit; char base[NAMESIZE]; if (split(name, strlen(name), base, sizeof base, &unit)) { error("invalid device name `%s'", name); return; } d = ht_lookup(devbasetab, intern(base)); if (d == NULL) { error("%s: unknown device `%s'", name, base); return; } if (d->d_ispseudo) { error("%s: %s is a pseudo-device", name, base); return; } if ((firsti = ht_lookup(devitab, name)) == NULL) { error("`%s' not defined", name); return; } if (at == NULL && firsti->i_at == NULL) { /* 'at root' */ remove_devi(firsti); return; } else if (at != NULL) for (i = firsti; i != NULL; i = i->i_alias) if (strcmp(at, i->i_at) == 0) { remove_devi(i); return; } error("`%s' at `%s' not found", name, at ? at : "root"); } static void remove_devi(struct devi *i) { struct devbase *d = i->i_base; struct devi *f, *j, **ppi; struct deva *iba; f = ht_lookup(devitab, i->i_name); if (f == NULL) panic("remove_devi(): instance %s disappeared from devitab", i->i_name); /* * We have the device instance, i. * We have to: * - delete the alias * * If the devi was an alias of an already listed devi, all is * good we don't have to do more. * If it was the first alias, we have to replace i's entry in * d's list by its first alias. * If it was the only entry, we must remove i's entry from d's * list. */ if (i != f) { for (j = f; j->i_alias != i; j = j->i_alias); j->i_alias = i->i_alias; } else { if (i->i_alias == NULL) { /* No alias, must unlink the entry from devitab */ ht_remove(devitab, i->i_name); j = i->i_bsame; } else { /* Or have the first alias replace i in d's list */ i->i_alias->i_bsame = i->i_bsame; j = i->i_alias; if (i == f) ht_replace(devitab, i->i_name, i->i_alias); } /* * - remove/replace the instance from the devbase's list * * A double-linked list would make this much easier. Oh, well, * what is done is done. */ for (ppi = &d->d_ihead; *ppi != NULL && *ppi != i && (*ppi)->i_bsame != i; ppi = &(*ppi)->i_bsame); if (*ppi == NULL) panic("deldev: dev (%s) doesn't list the devi" " (%s at %s)", d->d_name, i->i_name, i->i_at); f = *ppi; if (f == i) /* That implies d->d_ihead == i */ *ppi = j; else (*ppi)->i_bsame = j; if (d->d_ipp == &i->i_bsame) { if (i->i_alias == NULL) { if (f == i) d->d_ipp = &d->d_ihead; else d->d_ipp = &f->i_bsame; } else d->d_ipp = &i->i_alias->i_bsame; } } /* * - delete the attachment instance */ iba = i->i_atdeva; for (ppi = &iba->d_ihead; *ppi != NULL && *ppi != i && (*ppi)->i_asame != i; ppi = &(*ppi)->i_asame); if (*ppi == NULL) panic("deldev: deva (%s) doesn't list the devi (%s)", iba->d_name, i->i_name); f = *ppi; if (f == i) /* That implies iba->d_ihead == i */ *ppi = i->i_asame; else (*ppi)->i_asame = i->i_asame; if (iba->d_ipp == &i->i_asame) { if (f == i) iba->d_ipp = &iba->d_ihead; else iba->d_ipp = &f->i_asame; } /* * - delete the pspec */ if (i->i_pspec) { struct pspec *p = i->i_pspec; struct nvlist *nv, *onv; /* Double-linked nvlist anyone? */ for (nv = p->p_devs; nv->nv_next != NULL; nv = nv->nv_next) { if (nv->nv_next && nv->nv_next->nv_ptr == i) { onv = nv->nv_next; nv->nv_next = onv->nv_next; nvfree(onv); break; } if (nv->nv_ptr == i) { /* nv is p->p_devs in that case */ p->p_devs = nv->nv_next; nvfree(nv); break; } } if (p->p_devs == NULL) TAILQ_REMOVE(&allpspecs, p, p_list); } /* * - delete the alldevi entry */ TAILQ_REMOVE(&alldevi, i, i_next); ndevi--; /* * Put it in deaddevitab * * Each time a devi is removed, devilevel is increased so that later on * it is possible to tell if an instance was added before or after the * removal of its parent. * * For active instances, i_level contains the number of devi removed so * far, and for dead devis, it contains its index. */ i->i_level = devilevel++; i->i_alias = NULL; f = ht_lookup(deaddevitab, i->i_name); if (f == NULL) { if (ht_insert(deaddevitab, i->i_name, i)) panic("remove_devi(%s) - can't add to deaddevitab", i->i_name); } else { for (j = f; j->i_alias != NULL; j = j->i_alias); j->i_alias = i; } /* * - reconstruct d->d_umax */ d->d_umax = 0; for (i = d->d_ihead; i != NULL; i = i->i_bsame) if (i->i_unit >= d->d_umax) d->d_umax = i->i_unit + 1; } void deldeva(const char *at) { int unit; const char *cp; struct devbase *d, *ad; struct devi *i, *j; struct attr *a; struct pspec *p; struct nvlist *nv, *stack = NULL; if (at == NULL) { TAILQ_FOREACH(i, &alldevi, i_next) if (i->i_at == NULL) stack = newnv(NULL, NULL, i, 0, stack); } else { int l; l = strlen(at) - 1; if (at[l] == '?' || isdigit((unsigned char)at[l])) { char base[NAMESIZE]; if (split(at, l+1, base, sizeof base, &unit)) { error("invalid attachment name `%s'", at); return; } cp = intern(base); } else { cp = intern(at); unit = STAR; } ad = ht_lookup(devbasetab, cp); a = ht_lookup(attrtab, cp); if (a == NULL) { error("unknown attachment attribute or device `%s'", cp); return; } if (!a->a_iattr) { error("plain attribute `%s' cannot have children", a->a_name); return; } /* * remove_devi() makes changes to the devbase's list and the * alias list, * so the actual deletion of the instances must * be delayed. */ for (nv = a->a_devs; nv != NULL; nv = nv->nv_next) { d = nv->nv_ptr; for (i = d->d_ihead; i != NULL; i = i->i_bsame) for (j = i; j != NULL; j = j->i_alias) { /* Ignore devices at root */ if (j->i_at == NULL) continue; p = j->i_pspec; /* * There are three cases: * * 1. unit is not STAR. Consider 'at' * to be explicit, even if it * references an interface * attribute. * * 2. unit is STAR and 'at' references * a real device. Look for pspec * that have a matching p_atdev * field. * * 3. unit is STAR and 'at' references * an interface attribute. Look * for pspec that have a matching * p_iattr field. */ if ((unit != STAR && /* Case */ !strcmp(j->i_at, at)) || /* 1 */ (unit == STAR && ((ad != NULL && /* Case */ p->p_atdev == ad) || /* 2 */ (ad == NULL && /* Case */ p->p_iattr == a)))) /* 3 */ stack = newnv(NULL, NULL, j, 0, stack); } } } for (nv = stack; nv != NULL; nv = nv->nv_next) remove_devi(nv->nv_ptr); nvfreel(stack); } void deldev(const char *name) { int l; struct devi *firsti, *i; struct nvlist *nv, *stack = NULL; l = strlen(name) - 1; if (name[l] == '*' || isdigit((unsigned char)name[l])) { /* `no mydev0' or `no mydev*' */ firsti = ht_lookup(devitab, name); if (firsti == NULL) { error("unknown instance %s", name); return; } for (i = firsti; i != NULL; i = i->i_alias) stack = newnv(NULL, NULL, i, 0, stack); } else { struct devbase *d = ht_lookup(devbasetab, name); if (d == NULL) { error("unknown device %s", name); return; } if (d->d_ispseudo) { error("%s is a pseudo-device; " "use \"no pseudo-device %s\" instead", name, name); return; } for (firsti = d->d_ihead; firsti != NULL; firsti = firsti->i_bsame) for (i = firsti; i != NULL; i = i->i_alias) stack = newnv(NULL, NULL, i, 0, stack); } for (nv = stack; nv != NULL; nv = nv->nv_next) remove_devi(nv->nv_ptr); nvfreel(stack); } void addpseudo(const char *name, int number) { struct devbase *d; struct devi *i; d = ht_lookup(devbasetab, name); if (d == NULL) { error("undefined pseudo-device %s", name); return; } if (!d->d_ispseudo) { error("%s is a real device, not a pseudo-device", name); return; } if (ht_lookup(devitab, name) != NULL) { error("`%s' already defined", name); return; } i = newdevi(name, number - 1, d); /* foo 16 => "foo0..foo15" */ if (ht_insert(devitab, name, i)) panic("addpseudo(%s)", name); /* Useful to retrieve the instance from the devbase */ d->d_ihead = i; i->i_active = DEVI_ACTIVE; TAILQ_INSERT_TAIL(&allpseudo, i, i_next); } void delpseudo(const char *name) { struct devbase *d; struct devi *i; d = ht_lookup(devbasetab, name); if (d == NULL) { error("undefined pseudo-device %s", name); return; } if (!d->d_ispseudo) { error("%s is a real device, not a pseudo-device", name); return; } if ((i = ht_lookup(devitab, name)) == NULL) { error("`%s' not defined", name); return; } d->d_umax = 0; /* clear neads-count entries */ d->d_ihead = NULL; /* make sure it won't be considered active */ TAILQ_REMOVE(&allpseudo, i, i_next); if (ht_remove(devitab, name)) panic("delpseudo(%s) - can't remove from devitab", name); if (ht_insert(deaddevitab, name, i)) panic("delpseudo(%s) - can't add to deaddevitab", name); } void adddevm(const char *name, int cmajor, int bmajor, struct nvlist *options) { struct devm *dm; if (cmajor < -1 || cmajor >= 4096) { error("character major %d is invalid", cmajor); nvfreel(options); return; } if (bmajor < -1 || bmajor >= 4096) { error("block major %d is invalid", bmajor); nvfreel(options); return; } if (cmajor == -1 && bmajor == -1) { error("both character/block majors are not specified"); nvfreel(options); return; } dm = ecalloc(1, sizeof(*dm)); dm->dm_srcfile = yyfile; dm->dm_srcline = currentline(); dm->dm_name = name; dm->dm_cmajor = cmajor; dm->dm_bmajor = bmajor; dm->dm_opts = options; TAILQ_INSERT_TAIL(&alldevms, dm, dm_next); maxcdevm = MAX(maxcdevm, dm->dm_cmajor); maxbdevm = MAX(maxbdevm, dm->dm_bmajor); } int fixdevis(void) { struct devi *i; int error = 0; TAILQ_FOREACH(i, &alldevi, i_next) if (i->i_active == DEVI_ACTIVE) selectbase(i->i_base, i->i_atdeva); else if (i->i_active == DEVI_ORPHAN) { /* * At this point, we can't have instances for which * i_at or i_pspec are NULL. */ ++error; xerror(i->i_srcfile, i->i_lineno, "`%s at %s' is orphaned (%s `%s' found)", i->i_name, i->i_at, i->i_pspec->p_atunit == WILD ? "nothing matching" : "no", i->i_at); } else if (vflag && i->i_active == DEVI_IGNORED) xwarn(i->i_srcfile, i->i_lineno, "ignoring explicitely" " orphaned instance `%s at %s'", i->i_name, i->i_at); if (error) return error; TAILQ_FOREACH(i, &allpseudo, i_next) if (i->i_active == DEVI_ACTIVE) selectbase(i->i_base, NULL); return 0; } /* * Look up a parent spec, creating a new one if it does not exist. */ static struct pspec * getpspec(struct attr *attr, struct devbase *ab, int atunit) { struct pspec *p; TAILQ_FOREACH(p, &allpspecs, p_list) { if (p->p_iattr == attr && p->p_atdev == ab && p->p_atunit == atunit) return (p); } p = ecalloc(1, sizeof(*p)); p->p_iattr = attr; p->p_atdev = ab; p->p_atunit = atunit; p->p_inst = npspecs++; p->p_active = 0; TAILQ_INSERT_TAIL(&allpspecs, p, p_list); return (p); } /* * Define a new instance of a specific device. */ static struct devi * getdevi(const char *name) { struct devi *i, *firsti; struct devbase *d; int unit; char base[NAMESIZE]; if (split(name, strlen(name), base, sizeof base, &unit)) { error("invalid device name `%s'", name); return (NULL); } d = ht_lookup(devbasetab, intern(base)); if (d == NULL) { error("%s: unknown device `%s'", name, base); return (NULL); } if (d->d_ispseudo) { error("%s: %s is a pseudo-device", name, base); return (NULL); } firsti = ht_lookup(devitab, name); i = newdevi(name, unit, d); if (firsti == NULL) { if (ht_insert(devitab, name, i)) panic("getdevi(%s)", name); *d->d_ipp = i; d->d_ipp = &i->i_bsame; } else { while (firsti->i_alias) firsti = firsti->i_alias; firsti->i_alias = i; } TAILQ_INSERT_TAIL(&alldevi, i, i_next); ndevi++; return (i); } static const char * concat(const char *name, int c) { int len; char buf[NAMESIZE]; len = strlen(name); if (len + 2 > sizeof(buf)) { error("device name `%s%c' too long", name, c); len = sizeof(buf) - 2; } memmove(buf, name, len); buf[len] = c; buf[len + 1] = 0; return (intern(buf)); } const char * starref(const char *name) { return (concat(name, '*')); } const char * wildref(const char *name) { return (concat(name, '?')); } /* * Split a name like "foo0" into base name (foo) and unit number (0). * Return 0 on success. To make this useful for names like "foo0a", * the length of the "foo0" part is one of the arguments. */ static int split(const char *name, size_t nlen, char *base, size_t bsize, int *aunit) { const char *cp; int c, l; l = nlen; if (l < 2 || l >= bsize || isdigit((unsigned char)*name)) return (1); c = (u_char)name[--l]; if (!isdigit(c)) { if (c == '*') *aunit = STAR; else if (c == '?') *aunit = WILD; else return (1); } else { cp = &name[l]; while (isdigit((unsigned char)cp[-1])) l--, cp--; *aunit = atoi(cp); } memmove(base, name, l); base[l] = 0; return (0); } void selectattr(struct attr *a) { (void)ht_insert(selecttab, a->a_name, (char *)a->a_name); } /* * We have an instance of the base foo, so select it and all its * attributes for "optional foo". */ static void selectbase(struct devbase *d, struct deva *da) { struct attr *a; struct nvlist *nv; (void)ht_insert(selecttab, d->d_name, (char *)d->d_name); for (nv = d->d_attrs; nv != NULL; nv = nv->nv_next) { a = nv->nv_ptr; expandattr(a, selectattr); } if (da != NULL) { (void)ht_insert(selecttab, da->d_name, (char *)da->d_name); for (nv = da->d_attrs; nv != NULL; nv = nv->nv_next) { a = nv->nv_ptr; expandattr(a, selectattr); } } } /* * Is the given pointer on the given list of pointers? */ int onlist(struct nvlist *nv, void *ptr) { for (; nv != NULL; nv = nv->nv_next) if (nv->nv_ptr == ptr) return (1); return (0); } static char * extend(char *p, const char *name) { int l; l = strlen(name); memmove(p, name, l); p += l; *p++ = ','; *p++ = ' '; return (p); } /* * Check that we got all required locators, and default any that are * given as "?" and have defaults. Return 0 on success. */ static const char ** fixloc(const char *name, struct attr *attr, struct nvlist *got) { struct nvlist *m, *n; int ord; const char **lp; int nmissing, nextra, nnodefault; char *mp, *ep, *ndp; char missing[1000], extra[1000], nodefault[1000]; static const char *nullvec[1]; /* * Look for all required locators, and number the given ones * according to the required order. While we are numbering, * set default values for defaulted locators. */ if (attr->a_loclen == 0) /* e.g., "at root" */ lp = nullvec; else lp = emalloc((attr->a_loclen + 1) * sizeof(const char *)); for (n = got; n != NULL; n = n->nv_next) n->nv_int = -1; nmissing = 0; mp = missing; /* yes, this is O(mn), but m and n should be small */ for (ord = 0, m = attr->a_locs; m != NULL; m = m->nv_next, ord++) { for (n = got; n != NULL; n = n->nv_next) { if (n->nv_name == m->nv_name) { n->nv_int = ord; break; } } if (n == NULL && m->nv_int == 0) { nmissing++; mp = extend(mp, m->nv_name); } lp[ord] = m->nv_str; } if (ord != attr->a_loclen) panic("fixloc"); lp[ord] = NULL; nextra = 0; ep = extra; nnodefault = 0; ndp = nodefault; for (n = got; n != NULL; n = n->nv_next) { if (n->nv_int >= 0) { if (n->nv_str != NULL) lp[n->nv_int] = n->nv_str; else if (lp[n->nv_int] == NULL) { nnodefault++; ndp = extend(ndp, n->nv_name); } } else { nextra++; ep = extend(ep, n->nv_name); } } if (nextra) { ep[-2] = 0; /* kill ", " */ error("%s: extraneous locator%s: %s", name, nextra > 1 ? "s" : "", extra); } if (nmissing) { mp[-2] = 0; error("%s: must specify %s", name, missing); } if (nnodefault) { ndp[-2] = 0; error("%s: cannot wildcard %s", name, nodefault); } if (nmissing || nnodefault) { free(lp); lp = NULL; } return (lp); } void setversion(int newver) { if (newver > CONFIG_VERSION) error("your sources require a newer version of config(1) " "-- please rebuild it."); else if (newver < CONFIG_MINVERSION) error("your sources are out of date -- please update."); else version = newver; }