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71528152915301531153215331534153515361537 |
- #include "all.h"
- #include "io.h"
- enum {
- Slop = 256, /* room at the start of a message buf for proto hdrs */
- };
- Filsys*
- fsstr(char *p)
- {
- Filsys *fs;
- for(fs=filsys; fs->name; fs++)
- if(strcmp(fs->name, p) == 0)
- return fs;
- return 0;
- }
- Filsys*
- dev2fs(Device *dev)
- {
- Filsys *fs;
- for(fs=filsys; fs->name; fs++)
- if(fs->dev == dev)
- return fs;
- return 0;
- }
- /*
- * allocate 'count' contiguous channels
- * of type 'type' and return pointer to base
- */
- Chan*
- fs_chaninit(int type, int count, int data)
- {
- uchar *p;
- Chan *cp, *icp;
- int i;
- p = malloc(count * (sizeof(Chan)+data));
- icp = (Chan*)p;
- for(i = 0; i < count; i++) {
- cp = (Chan*)p;
- cp->next = chans;
- chans = cp;
- cp->type = type;
- cp->chan = cons.chano;
- cons.chano++;
- strncpy(cp->whoname, "<none>", sizeof cp->whoname);
- wlock(&cp->reflock);
- wunlock(&cp->reflock);
- rlock(&cp->reflock);
- runlock(&cp->reflock);
- p += sizeof(Chan);
- if(data){
- cp->pdata = p;
- p += data;
- }
- }
- return icp;
- }
- void
- fileinit(Chan *cp)
- {
- File *f, *prev;
- Tlock *t;
- int h;
- loop:
- lock(&flock);
- for (h=0; h < nelem(flist); h++)
- for (prev=0, f = flist[h]; f; prev=f, f=f->next) {
- if(f->cp != cp)
- continue;
- if(prev) {
- prev->next = f->next;
- f->next = flist[h];
- flist[h] = f;
- }
- flist[h] = f->next;
- unlock(&flock);
- qlock(f);
- if(t = f->tlock) {
- if(t->file == f)
- t->time = 0; /* free the lock */
- f->tlock = 0;
- }
- if(f->open & FREMOV)
- doremove(f, 0);
- freewp(f->wpath);
- f->open = 0;
- authfree(f->auth);
- f->auth = 0;
- f->cp = 0;
- qunlock(f);
- goto loop;
- }
- unlock(&flock);
- }
- enum { NOFID = (ulong)~0 };
- /*
- * returns a locked file structure
- */
- File*
- filep(Chan *cp, ulong fid, int flag)
- {
- File *f;
- int h;
- if(fid == NOFID)
- return 0;
- h = (long)(uintptr)cp + fid;
- if(h < 0)
- h = ~h;
- h %= nelem(flist);
- loop:
- lock(&flock);
- for(f=flist[h]; f; f=f->next)
- if(f->fid == fid && f->cp == cp){
- /*
- * Already in use is an error
- * when called from attach or clone (walk
- * in 9P2000). The console uses FID[12] and
- * never clunks them so catch that case.
- */
- if(flag == 0 || cp == cons.chan)
- goto out;
- unlock(&flock);
- return 0;
- }
- if(flag) {
- f = newfp();
- if(f) {
- f->fid = fid;
- f->cp = cp;
- f->wpath = 0;
- f->tlock = 0;
- f->doffset = 0;
- f->dslot = 0;
- f->auth = 0;
- f->next = flist[h];
- flist[h] = f;
- goto out;
- }
- }
- unlock(&flock);
- return 0;
- out:
- unlock(&flock);
- qlock(f);
- if(f->fid == fid && f->cp == cp)
- return f;
- qunlock(f);
- goto loop;
- }
- /*
- * always called with flock locked
- */
- File*
- newfp(void)
- {
- static int first;
- File *f;
- int start, i;
- i = first;
- start = i;
- do {
- f = &files[i];
- i++;
- if(i >= conf.nfile)
- i = 0;
- if(f->cp)
- continue;
- first = i;
- return f;
- } while(i != start);
- print("out of files\n");
- return 0;
- }
- void
- freefp(File *fp)
- {
- Chan *cp;
- File *f, *prev;
- int h;
- if(!fp || !(cp = fp->cp))
- return;
- h = (long)(uintptr)cp + fp->fid;
- if(h < 0)
- h = ~h;
- h %= nelem(flist);
- lock(&flock);
- for(prev=0,f=flist[h]; f; prev=f,f=f->next)
- if(f == fp) {
- if(prev)
- prev->next = f->next;
- else
- flist[h] = f->next;
- break;
- }
- fp->cp = 0;
- unlock(&flock);
- }
- int
- iaccess(File *f, Dentry *d, int m)
- {
- /* uid none gets only other permissions */
- if(f->uid != 0) {
- /*
- * owner
- */
- if(f->uid == d->uid)
- if((m<<6) & d->mode)
- return 0;
- /*
- * group membership
- */
- if(ingroup(f->uid, d->gid))
- if((m<<3) & d->mode)
- return 0;
- }
- /*
- * other
- */
- if(m & d->mode) {
- if((d->mode & DDIR) && (m == DEXEC))
- return 0;
- if(!ingroup(f->uid, 9999))
- return 0;
- }
- /*
- * various forms of superuser
- */
- if(wstatallow)
- return 0;
- if(duallow != 0 && duallow == f->uid)
- if((d->mode & DDIR) && (m == DREAD || m == DEXEC))
- return 0;
- return 1;
- }
- Tlock*
- tlocked(Iobuf *p, Dentry *d)
- {
- Tlock *t, *t1;
- Off qpath;
- Timet tim;
- Device *dev;
- tim = toytime();
- qpath = d->qid.path;
- dev = p->dev;
- again:
- t1 = 0;
- for(t=tlocks+NTLOCK-1; t>=tlocks; t--) {
- if(t->qpath == qpath)
- if(t->time >= tim)
- if(t->dev == dev)
- return nil; /* its locked */
- if(t1 != nil && t->time == 0)
- t1 = t; /* remember free lock */
- }
- if(t1 == 0) {
- // reclaim old locks
- lock(&tlocklock);
- for(t=tlocks+NTLOCK-1; t>=tlocks; t--)
- if(t->time < tim) {
- t->time = 0;
- t1 = t;
- }
- unlock(&tlocklock);
- }
- if(t1) {
- lock(&tlocklock);
- if(t1->time != 0) {
- unlock(&tlocklock);
- goto again;
- }
- t1->dev = dev;
- t1->qpath = qpath;
- t1->time = tim + TLOCK;
- unlock(&tlocklock);
- }
- /* botch
- * out of tlock nodes simulates
- * a locked file
- */
- return t1;
- }
- Wpath*
- newwp(void)
- {
- static int si = 0;
- int i;
- Wpath *w, *sw, *ew;
- i = si + 1;
- if(i < 0 || i >= conf.nwpath)
- i = 0;
- si = i;
- sw = &wpaths[i];
- ew = &wpaths[conf.nwpath];
- for(w=sw;;) {
- w++;
- if(w >= ew)
- w = &wpaths[0];
- if(w == sw) {
- print("out of wpaths\n");
- return 0;
- }
- if(w->refs)
- continue;
- lock(&wpathlock);
- if(w->refs) {
- unlock(&wpathlock);
- continue;
- }
- w->refs = 1;
- w->up = 0;
- unlock(&wpathlock);
- return w;
- }
- }
- void
- freewp(Wpath *w)
- {
- lock(&wpathlock);
- for(; w; w=w->up)
- w->refs--;
- unlock(&wpathlock);
- }
- Off
- qidpathgen(Device *dev)
- {
- Iobuf *p;
- Superb *sb;
- Off path;
- p = getbuf(dev, superaddr(dev), Brd|Bmod);
- if(!p || checktag(p, Tsuper, QPSUPER))
- panic("newqid: super block");
- sb = (Superb*)p->iobuf;
- sb->qidgen++;
- path = sb->qidgen;
- putbuf(p);
- return path;
- }
- /* truncating to length > 0 */
- static void
- truncfree(Truncstate *ts, Device *dev, int d, Iobuf *p, int i)
- {
- int pastlast;
- Off a;
- pastlast = ts->pastlast;
- a = ((Off *)p->iobuf)[i];
- if (d > 0 || pastlast)
- buffree(dev, a, d, ts);
- if (pastlast) {
- ((Off *)p->iobuf)[i] = 0;
- p->flags |= Bmod|Bimm;
- } else if (d == 0 && ts->relblk == ts->lastblk)
- ts->pastlast = 1;
- if (d == 0)
- ts->relblk++;
- }
- /*
- * free the block at `addr' on dev.
- * if it's an indirect block (d [depth] > 0),
- * first recursively free all the blocks it names.
- *
- * ts->relblk is the block number within the file of this
- * block (or the first data block eventually pointed to via
- * this indirect block).
- */
- void
- buffree(Device *dev, Off addr, int d, Truncstate *ts)
- {
- Iobuf *p;
- Off a;
- int i, pastlast;
- if(!addr)
- return;
- pastlast = (ts == nil? 1: ts->pastlast);
- /*
- * if this is an indirect block, recurse and free any
- * suitable blocks within it (possibly via further indirect blocks).
- */
- if(d > 0) {
- d--;
- p = getbuf(dev, addr, Brd);
- if(p) {
- if (ts == nil) /* common case: create */
- for(i=INDPERBUF-1; i>=0; i--) {
- a = ((Off *)p->iobuf)[i];
- buffree(dev, a, d, nil);
- }
- else /* wstat truncation */
- for (i = 0; i < INDPERBUF; i++)
- truncfree(ts, dev, d, p, i);
- putbuf(p);
- }
- }
- if (!pastlast)
- return;
- /*
- * having zeroed the pointer to this block, add it to the free list.
- * stop outstanding i/o
- */
- p = getbuf(dev, addr, Bprobe);
- if(p) {
- p->flags &= ~(Bmod|Bimm);
- putbuf(p);
- }
- /*
- * dont put written worm
- * blocks into free list
- */
- if(dev->type == Devcw) {
- i = cwfree(dev, addr);
- if(i)
- return;
- }
- p = getbuf(dev, superaddr(dev), Brd|Bmod);
- if(!p || checktag(p, Tsuper, QPSUPER))
- panic("buffree: super block");
- addfree(dev, addr, (Superb*)p->iobuf);
- putbuf(p);
- }
- Off
- bufalloc(Device *dev, int tag, long qid, int uid)
- {
- Iobuf *bp, *p;
- Superb *sb;
- Off a, n;
- p = getbuf(dev, superaddr(dev), Brd|Bmod);
- if(!p || checktag(p, Tsuper, QPSUPER)) {
- print("bufalloc: super block\n");
- if(p)
- putbuf(p);
- return 0;
- }
- sb = (Superb*)p->iobuf;
- loop:
- n = --sb->fbuf.nfree;
- sb->tfree--;
- if(n < 0 || n >= FEPERBUF) {
- print("bufalloc: %Z: bad freelist\n", dev);
- n = 0;
- sb->fbuf.free[0] = 0;
- }
- a = sb->fbuf.free[n];
- if(n <= 0) {
- if(a == 0) {
- sb->tfree = 0;
- sb->fbuf.nfree = 1;
- if(dev->type == Devcw) {
- n = uid;
- if(n < 0 || n >= nelem(growacct))
- n = 0;
- growacct[n]++;
- if(cwgrow(dev, sb, uid))
- goto loop;
- }
- putbuf(p);
- print("fs %Z full uid=%d\n", dev, uid);
- return 0;
- }
- bp = getbuf(dev, a, Brd);
- if(!bp || checktag(bp, Tfree, QPNONE)) {
- if(bp)
- putbuf(bp);
- putbuf(p);
- return 0;
- }
- sb->fbuf = *(Fbuf*)bp->iobuf;
- putbuf(bp);
- }
- bp = getbuf(dev, a, Bmod);
- memset(bp->iobuf, 0, RBUFSIZE);
- settag(bp, tag, qid);
- if(tag == Tind1 || tag == Tind2 || tag == Tdir)
- bp->flags |= Bimm;
- putbuf(bp);
- putbuf(p);
- return a;
- }
- /*
- * what are legal characters in a name?
- * only disallow control characters.
- * a) utf avoids control characters.
- * b) '/' may not be the separator
- */
- int
- checkname(char *n)
- {
- int i, c;
- for(i=0; i<NAMELEN; i++) {
- c = *n & 0xff;
- if(c == 0) {
- if(i == 0)
- return 1;
- memset(n, 0, NAMELEN-i);
- return 0;
- }
- if(c <= 040)
- return 1;
- n++;
- }
- return 1; /* too long */
- }
- void
- addfree(Device *dev, Off addr, Superb *sb)
- {
- int n;
- Iobuf *p;
- n = sb->fbuf.nfree;
- if(n < 0 || n > FEPERBUF)
- panic("addfree: bad freelist");
- if(n >= FEPERBUF) {
- p = getbuf(dev, addr, Bmod|Bimm);
- if(p == 0)
- panic("addfree: getbuf");
- *(Fbuf*)p->iobuf = sb->fbuf;
- settag(p, Tfree, QPNONE);
- putbuf(p);
- n = 0;
- }
- sb->fbuf.free[n++] = addr;
- sb->fbuf.nfree = n;
- sb->tfree++;
- if(addr >= sb->fsize)
- sb->fsize = addr+1;
- }
- /*
- static int
- Yfmt(Fmt* fmt)
- {
- Chan *cp;
- char s[20];
- cp = va_arg(fmt->args, Chan*);
- sprint(s, "C%d.%.3d", cp->type, cp->chan);
- return fmtstrcpy(fmt, s);
- }
- */
- static int
- Zfmt(Fmt* fmt)
- {
- Device *d;
- int c, c1;
- char s[100];
- d = va_arg(fmt->args, Device*);
- if(d == nil) {
- sprint(s, "Z***");
- goto out;
- }
- c = c1 = '\0';
- switch(d->type) {
- default:
- sprint(s, "D%d", d->type);
- break;
- case Devwren:
- c = 'w';
- /* fallthrough */
- case Devworm:
- if (c == '\0')
- c = 'r';
- /* fallthrough */
- case Devlworm:
- if (c == '\0')
- c = 'l';
- if(d->wren.ctrl == 0 && d->wren.lun == 0)
- sprint(s, "%c%d", c, d->wren.targ);
- else
- sprint(s, "%c%d.%d.%d", c, d->wren.ctrl, d->wren.targ,
- d->wren.lun);
- break;
- case Devmcat:
- c = '(';
- c1 = ')';
- /* fallthrough */
- case Devmlev:
- if (c == '\0') {
- c = '[';
- c1 = ']';
- }
- /* fallthrough */
- case Devmirr:
- if (c == '\0') {
- c = '{';
- c1 = '}';
- }
- if(d->cat.first == d->cat.last)
- sprint(s, "%c%Z%c", c, d->cat.first, c1);
- else if(d->cat.first->link == d->cat.last)
- sprint(s, "%c%Z%Z%c", c, d->cat.first, d->cat.last, c1);
- else
- sprint(s, "%c%Z-%Z%c", c, d->cat.first, d->cat.last, c1);
- break;
- case Devro:
- sprint(s, "o%Z%Z", d->ro.parent->cw.c, d->ro.parent->cw.w);
- break;
- case Devcw:
- sprint(s, "c%Z%Z", d->cw.c, d->cw.w);
- break;
- case Devjuke:
- sprint(s, "j%Z%Z", d->j.j, d->j.m);
- break;
- case Devfworm:
- sprint(s, "f%Z", d->fw.fw);
- break;
- case Devpart:
- sprint(s, "p(%Z)%ld.%ld", d->part.d, d->part.base, d->part.size);
- break;
- case Devswab:
- sprint(s, "x%Z", d->swab.d);
- break;
- case Devnone:
- sprint(s, "n");
- break;
- }
- out:
- return fmtstrcpy(fmt, s);
- }
- static int
- Gfmt(Fmt* fmt)
- {
- int t;
- char *s;
- t = va_arg(fmt->args, int);
- s = "<badtag>";
- if(t >= 0 && t < MAXTAG)
- s = tagnames[t];
- return fmtstrcpy(fmt, s);
- }
- void
- formatinit(void)
- {
- quotefmtinstall();
- // fmtinstall('Y', Yfmt); /* print channels */
- fmtinstall('Z', Zfmt); /* print devices */
- fmtinstall('G', Gfmt); /* print tags */
- fmtinstall('T', Tfmt); /* print times */
- // fmtinstall('E', eipfmt); /* print ether addresses */
- fmtinstall('I', eipfmt); /* print ip addresses */
- }
- void
- rootream(Device *dev, Off addr)
- {
- Iobuf *p;
- Dentry *d;
- p = getbuf(dev, addr, Bmod|Bimm);
- memset(p->iobuf, 0, RBUFSIZE);
- settag(p, Tdir, QPROOT);
- d = getdir(p, 0);
- strcpy(d->name, "/");
- d->uid = -1;
- d->gid = -1;
- d->mode = DALLOC | DDIR |
- ((DREAD|DEXEC) << 6) |
- ((DREAD|DEXEC) << 3) |
- ((DREAD|DEXEC) << 0);
- d->qid = QID9P1(QPROOT|QPDIR,0);
- d->atime = time(nil);
- d->mtime = d->atime;
- d->muid = 0;
- putbuf(p);
- }
- void
- superream(Device *dev, Off addr)
- {
- Iobuf *p;
- Superb *s;
- Off i;
- p = getbuf(dev, addr, Bmod|Bimm);
- memset(p->iobuf, 0, RBUFSIZE);
- settag(p, Tsuper, QPSUPER);
- s = (Superb*)p->iobuf;
- s->fstart = 2;
- s->fsize = devsize(dev);
- s->fbuf.nfree = 1;
- s->qidgen = 10;
- for(i = s->fsize-1; i >= addr+2; i--)
- addfree(dev, i, s);
- putbuf(p);
- }
- struct
- {
- Lock;
- Msgbuf *smsgbuf;
- Msgbuf *lmsgbuf;
- } msgalloc;
- /*
- * pre-allocate some message buffers at boot time.
- * if this supply is exhausted, more will be allocated as needed.
- */
- void
- mbinit(void)
- {
- Msgbuf *mb;
- Rabuf *rb;
- int i;
- lock(&msgalloc);
- unlock(&msgalloc);
- msgalloc.lmsgbuf = 0;
- msgalloc.smsgbuf = 0;
- for(i=0; i<conf.nlgmsg; i++) {
- mb = malloc(sizeof(Msgbuf));
- mb->magic = Mbmagic;
- mb->xdata = malloc(LARGEBUF+Slop);
- mb->flags = LARGE;
- mbfree(mb);
- cons.nlarge++;
- }
- for(i=0; i<conf.nsmmsg; i++) {
- mb = malloc(sizeof(Msgbuf));
- mb->magic = Mbmagic;
- mb->xdata = malloc(SMALLBUF+Slop);
- mb->flags = 0;
- mbfree(mb);
- cons.nsmall++;
- }
- memset(mballocs, 0, sizeof(mballocs));
- lock(&rabuflock);
- unlock(&rabuflock);
- rabuffree = 0;
- for(i=0; i<1000; i++) {
- rb = malloc(sizeof(*rb));
- rb->link = rabuffree;
- rabuffree = rb;
- }
- }
- Msgbuf*
- mballoc(int count, Chan *cp, int category)
- {
- Msgbuf *mb;
- lock(&msgalloc);
- if(count > SMALLBUF) {
- if(count > LARGEBUF)
- panic("msgbuf count");
- mb = msgalloc.lmsgbuf;
- if(mb == nil) {
- mb = malloc(sizeof(Msgbuf));
- mb->xdata = malloc(LARGEBUF+Slop);
- cons.nlarge++;
- } else
- msgalloc.lmsgbuf = mb->next;
- mb->flags = LARGE;
- } else {
- mb = msgalloc.smsgbuf;
- if(mb == nil) {
- mb = malloc(sizeof(Msgbuf));
- mb->xdata = malloc(SMALLBUF+Slop);
- cons.nsmall++;
- } else
- msgalloc.smsgbuf = mb->next;
- mb->flags = 0;
- }
- mballocs[category]++;
- unlock(&msgalloc);
- mb->magic = Mbmagic;
- mb->count = count;
- mb->chan = cp;
- mb->next = 0;
- mb->param = 0;
- mb->category = category;
- mb->data = mb->xdata+Slop;
- return mb;
- }
- void
- mbfree(Msgbuf *mb)
- {
- if(mb == nil)
- return;
- assert(mb->magic == Mbmagic);
- if (mb->magic != Mbmagic)
- panic("mbfree: bad magic 0x%lux", mb->magic);
- if(mb->flags & BTRACE)
- print("mbfree: BTRACE cat=%d flags=%ux, caller %#p\n",
- mb->category, mb->flags, getcallerpc(&mb));
- if(mb->flags & FREE)
- panic("mbfree already free");
- lock(&msgalloc);
- mballocs[mb->category]--;
- mb->flags |= FREE;
- if(mb->flags & LARGE) {
- mb->next = msgalloc.lmsgbuf;
- msgalloc.lmsgbuf = mb;
- } else {
- mb->next = msgalloc.smsgbuf;
- msgalloc.smsgbuf = mb;
- }
- mb->data = 0;
- mb->magic = 0;
- unlock(&msgalloc);
- }
- /*
- * returns 1 if n is prime
- * used for adjusting lengths
- * of hashing things.
- * there is no need to be clever
- */
- int
- prime(vlong n)
- {
- long i;
- if((n%2) == 0)
- return 0;
- for(i=3;; i+=2) {
- if((n%i) == 0)
- return 0;
- if((vlong)i*i >= n)
- return 1;
- }
- }
- char*
- getwrd(char *word, char *line)
- {
- int c, n;
- while(isascii(*line) && isspace(*line) && *line != '\n')
- line++;
- for(n = 0; n < Maxword; n++) {
- c = *line;
- if(c == '\0' || isascii(c) && isspace(c))
- break;
- line++;
- *word++ = c;
- }
- *word = 0;
- return line;
- }
- void
- hexdump(void *a, int n)
- {
- char s1[30], s2[4];
- uchar *p;
- int i;
- p = a;
- s1[0] = 0;
- for(i = 0; i < n; i++) {
- sprint(s2, " %.2ux", p[i]);
- strcat(s1, s2);
- if((i&7) == 7) {
- print("%s\n", s1);
- s1[0] = 0;
- }
- }
- if(s1[0])
- print("%s\n", s1);
- }
- void*
- fs_recv(Queue *q, int)
- {
- void *a;
- int i, c;
- if(q == nil)
- panic("recv null q");
- qlock(q);
- q->waitedfor = 1;
- while((c = q->count) <= 0)
- rsleep(&q->empty);
- i = q->loc;
- a = q->args[i];
- i++;
- if(i >= q->size)
- i = 0;
- q->loc = i;
- q->count = c-1;
- rwakeup(&q->full); /* no longer full */
- qunlock(q);
- return a;
- }
- void
- fs_send(Queue *q, void *a)
- {
- int i, c;
- if(q == nil)
- panic("send null q");
- if(!q->waitedfor) {
- for (i = 0; i < 5 && !q->waitedfor; i++)
- sleep(1000);
- if(!q->waitedfor) {
- /* likely a bug; don't wait forever */
- print("no readers yet for %s q\n", q->name);
- abort();
- }
- }
- qlock(q);
- while((c = q->count) >= q->size)
- rsleep(&q->full);
- i = q->loc + c;
- if(i >= q->size)
- i -= q->size;
- q->args[i] = a;
- q->count = c+1;
- rwakeup(&q->empty); /* no longer empty */
- qunlock(q);
- }
- Queue*
- newqueue(int size, char *name)
- {
- Queue *q;
- q = malloc(sizeof(Queue) + (size-1)*sizeof(void*));
- q->size = size;
- q->full.l = q->empty.l = &q->QLock;
- q->name = name;
- return q;
- }
- int
- devread(Device *d, Off b, void *c)
- {
- int e;
- for (;;)
- switch(d->type) {
- case Devcw:
- return cwread(d, b, c);
- case Devjuke:
- d = d->j.m;
- break;
- case Devro:
- return roread(d, b, c);
- case Devwren:
- return wrenread(d, b, c);
- case Devworm:
- case Devlworm:
- return wormread(d, b, c);
- case Devfworm:
- return fwormread(d, b, c);
- case Devmcat:
- return mcatread(d, b, c);
- case Devmlev:
- return mlevread(d, b, c);
- case Devmirr:
- return mirrread(d, b, c);
- case Devpart:
- return partread(d, b, c);
- case Devswab:
- e = devread(d->swab.d, b, c);
- if(e == 0)
- swab(c, 0);
- return e;
- case Devnone:
- print("read from device none(%lld)\n", (Wideoff)b);
- return 1;
- default:
- panic("illegal device in devread: %Z %lld",
- d, (Wideoff)b);
- return 1;
- }
- }
- int
- devwrite(Device *d, Off b, void *c)
- {
- int e;
- /*
- * set readonly to non-0 to prevent all writes;
- * mainly for trying dangerous experiments.
- */
- if (readonly)
- return 0;
- for (;;)
- switch(d->type) {
- case Devcw:
- return cwwrite(d, b, c);
- case Devjuke:
- d = d->j.m;
- break;
- case Devro:
- print("write to ro device %Z(%lld)\n", d, (Wideoff)b);
- return 1;
- case Devwren:
- return wrenwrite(d, b, c);
- case Devworm:
- case Devlworm:
- return wormwrite(d, b, c);
- case Devfworm:
- return fwormwrite(d, b, c);
- case Devmcat:
- return mcatwrite(d, b, c);
- case Devmlev:
- return mlevwrite(d, b, c);
- case Devmirr:
- return mirrwrite(d, b, c);
- case Devpart:
- return partwrite(d, b, c);
- case Devswab:
- swab(c, 1);
- e = devwrite(d->swab.d, b, c);
- swab(c, 0);
- return e;
- case Devnone:
- /* checktag() can generate blocks with type devnone */
- return 0;
- default:
- panic("illegal device in devwrite: %Z %lld",
- d, (Wideoff)b);
- return 1;
- }
- }
- Devsize
- devsize(Device *d)
- {
- for (;;)
- switch(d->type) {
- case Devcw:
- case Devro:
- return cwsize(d);
- case Devjuke:
- d = d->j.m;
- break;
- case Devwren:
- return wrensize(d);
- case Devworm:
- case Devlworm:
- return wormsize(d);
- case Devfworm:
- return fwormsize(d);
- case Devmcat:
- return mcatsize(d);
- case Devmlev:
- return mlevsize(d);
- case Devmirr:
- return mirrsize(d);
- case Devpart:
- return partsize(d);
- case Devswab:
- d = d->swab.d;
- break;
- default:
- panic("illegal device in devsize: %Z", d);
- return 0;
- }
- }
- /* result is malloced */
- char *
- sdof(Device *d)
- {
- static char name[256];
- for (;;)
- switch(d->type) {
- case Devjuke:
- d = d->j.j; /* robotics */
- break;
- case Devwren:
- snprint(name, sizeof name, "/dev/sd%d%d", d->wren.ctrl,
- d->wren.targ);
- return strdup(name);
- case Devswab:
- d = d->swab.d;
- break;
- default:
- panic("illegal device in sdof: %Z", d);
- return nil;
- }
- }
- Off
- superaddr(Device *d)
- {
- for (;;)
- switch(d->type) {
- default:
- return SUPER_ADDR;
- case Devcw:
- case Devro:
- return cwsaddr(d);
- case Devswab:
- d = d->swab.d;
- break;
- }
- }
- Off
- getraddr(Device *d)
- {
- for (;;)
- switch(d->type) {
- default:
- return ROOT_ADDR;
- case Devcw:
- case Devro:
- return cwraddr(d);
- case Devswab:
- d = d->swab.d;
- break;
- }
- }
- void
- devream(Device *d, int top)
- {
- Device *l;
- loop:
- print("\tdevream: %Z %d\n", d, top);
- switch(d->type) {
- default:
- print("ream: unknown dev type %Z\n", d);
- return;
- case Devcw:
- devream(d->cw.w, 0);
- devream(d->cw.c, 0);
- if(top) {
- wlock(&mainlock);
- cwream(d);
- wunlock(&mainlock);
- }
- devinit(d);
- return;
- case Devfworm:
- devream(d->fw.fw, 0);
- fwormream(d);
- break;
- case Devpart:
- devream(d->part.d, 0);
- break;
- case Devmlev:
- case Devmcat:
- case Devmirr:
- for(l=d->cat.first; l; l=l->link)
- devream(l, 0);
- break;
- case Devjuke:
- case Devworm:
- case Devlworm:
- case Devwren:
- break;
- case Devswab:
- d = d->swab.d;
- goto loop;
- }
- devinit(d);
- if(top) {
- wlock(&mainlock);
- rootream(d, ROOT_ADDR);
- superream(d, SUPER_ADDR);
- wunlock(&mainlock);
- }
- }
- void
- devrecover(Device *d)
- {
- for (;;) {
- print("recover: %Z\n", d);
- switch(d->type) {
- default:
- print("recover: unknown dev type %Z\n", d);
- return;
- case Devcw:
- wlock(&mainlock); /* recover */
- cwrecover(d);
- wunlock(&mainlock);
- return;
- case Devswab:
- d = d->swab.d;
- break;
- }
- }
- }
- void
- devinit(Device *d)
- {
- for (;;) {
- if(d->init)
- return;
- d->init = 1;
- print("\tdevinit %Z\n", d);
- switch(d->type) {
- default:
- print("devinit unknown device %Z\n", d);
- return;
- case Devro:
- cwinit(d->ro.parent);
- return;
- case Devcw:
- cwinit(d);
- return;
- case Devjuke:
- jukeinit(d);
- return;
- case Devwren:
- wreninit(d);
- return;
- case Devworm:
- case Devlworm:
- return;
- case Devfworm:
- fworminit(d);
- return;
- case Devmcat:
- mcatinit(d);
- return;
- case Devmlev:
- mlevinit(d);
- return;
- case Devmirr:
- mirrinit(d);
- return;
- case Devpart:
- partinit(d);
- return;
- case Devswab:
- d = d->swab.d;
- break;
- case Devnone:
- print("devinit of Devnone\n");
- return;
- }
- }
- }
- void
- swab2(void *c)
- {
- uchar *p;
- int t;
- p = c;
- t = p[0];
- p[0] = p[1];
- p[1] = t;
- }
- void
- swab4(void *c)
- {
- uchar *p;
- int t;
- p = c;
- t = p[0];
- p[0] = p[3];
- p[3] = t;
- t = p[1];
- p[1] = p[2];
- p[2] = t;
- }
- void
- swab8(void *c)
- {
- uchar *p;
- int t;
- p = c;
- t = p[0];
- p[0] = p[7];
- p[7] = t;
- t = p[1];
- p[1] = p[6];
- p[6] = t;
- t = p[2];
- p[2] = p[5];
- p[5] = t;
- t = p[3];
- p[3] = p[4];
- p[4] = t;
- }
- /*
- * swab a block
- * flag = 0 -- convert from foreign to native
- * flag = 1 -- convert from native to foreign
- */
- void
- swab(void *c, int flag)
- {
- uchar *p;
- Tag *t;
- int i, j;
- Dentry *d;
- Cache *h;
- Bucket *b;
- Superb *s;
- Fbuf *f;
- Off *l;
- /* swab the tag */
- p = (uchar*)c;
- t = (Tag*)(p + BUFSIZE);
- if(!flag) {
- swab2(&t->pad);
- swab2(&t->tag);
- swaboff(&t->path);
- }
- /* swab each block type */
- switch(t->tag) {
- default:
- print("no swab for tag=%G rw=%d\n", t->tag, flag);
- for(j=0; j<16; j++)
- print(" %.2x", p[BUFSIZE+j]);
- print("\n");
- for(i=0; i<16; i++) {
- print("%.4x", i*16);
- for(j=0; j<16; j++)
- print(" %.2x", p[i*16+j]);
- print("\n");
- }
- panic("swab");
- break;
- case Tsuper:
- s = (Superb*)p;
- swaboff(&s->fbuf.nfree);
- for(i=0; i<FEPERBUF; i++)
- swaboff(&s->fbuf.free[i]);
- swaboff(&s->fstart);
- swaboff(&s->fsize);
- swaboff(&s->tfree);
- swaboff(&s->qidgen);
- swaboff(&s->cwraddr);
- swaboff(&s->roraddr);
- swaboff(&s->last);
- swaboff(&s->next);
- break;
- case Tdir:
- for(i=0; i<DIRPERBUF; i++) {
- d = (Dentry*)p + i;
- swab2(&d->uid);
- swab2(&d->gid);
- swab2(&d->mode);
- swab2(&d->muid);
- swaboff(&d->qid.path);
- swab4(&d->qid.version);
- swaboff(&d->size);
- for(j=0; j<NDBLOCK; j++)
- swaboff(&d->dblock[j]);
- for (j = 0; j < NIBLOCK; j++)
- swaboff(&d->iblocks[j]);
- swab4(&d->atime);
- swab4(&d->mtime);
- }
- break;
- case Tind1:
- case Tind2:
- #ifndef COMPAT32
- case Tind3:
- case Tind4:
- /* add more Tind tags here ... */
- #endif
- l = (Off *)p;
- for(i=0; i<INDPERBUF; i++) {
- swaboff(l);
- l++;
- }
- break;
- case Tfree:
- f = (Fbuf*)p;
- swaboff(&f->nfree);
- for(i=0; i<FEPERBUF; i++)
- swaboff(&f->free[i]);
- break;
- case Tbuck:
- for(i=0; i<BKPERBLK; i++) {
- b = (Bucket*)p + i;
- swab4(&b->agegen);
- for(j=0; j<CEPERBK; j++) {
- swab2(&b->entry[j].age);
- swab2(&b->entry[j].state);
- swaboff(&b->entry[j].waddr);
- }
- }
- break;
- case Tcache:
- h = (Cache*)p;
- swaboff(&h->maddr);
- swaboff(&h->msize);
- swaboff(&h->caddr);
- swaboff(&h->csize);
- swaboff(&h->fsize);
- swaboff(&h->wsize);
- swaboff(&h->wmax);
- swaboff(&h->sbaddr);
- swaboff(&h->cwraddr);
- swaboff(&h->roraddr);
- swab4(&h->toytime);
- swab4(&h->time);
- break;
- case Tnone: // unitialized
- case Tfile: // someone elses problem
- case Tvirgo: // bit map -- all bytes
- case Tconfig: // configuration string -- all bytes
- break;
- }
- /* swab the tag */
- if(flag) {
- swab2(&t->pad);
- swab2(&t->tag);
- swaboff(&t->path);
- }
- }
|