ref: e51c4bc6e493a9cd0d9e9d7f1d24c57ae77bab65
dir: /sys/src/cmd/cwfs/sub.c/
#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 count, int data)
{
uchar *p;
Chan *cp, *icp;
int i;
p = ialloc((uintptr)count * (sizeof(Chan)+data), 0);
icp = (Chan*)p;
for(i = 0; i < count; i++) {
cp = (Chan*)p;
cp->next = chans;
chans = cp;
cp->chan = cons.chano;
cons.chano++;
snprint(cp->whoname, sizeof(cp->whoname), "<none>");
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);
freewp(f->wpath);
f->open = 0;
authfree(f->auth);
f->auth = 0;
f->cp = 0;
qunlock(f);
goto loop;
}
unlock(&flock);
}
/*
* 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);
fprint(2, "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) {
/*
* walk directories regardless.
* otherwise its impossible to get
* from the root to noworld's directories.
*/
if((d->mode & DDIR) && (m == DEXEC))
return 0;
if(!ingroup(f->uid, 9999))
return 0;
}
/* read access for du */
if(duallow != 0 && duallow == f->uid)
if((d->mode & DDIR) && (m == DREAD || m == DEXEC))
return 0;
/* allow god */
return !isallowed(f);
}
int
isallowed(File *f)
{
if(f->cp == cons.chan)
return 1;
switch(allowed){
case 0:
return 0;
case -1:
return 1;
default:
return f->uid == allowed;
}
}
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) {
fprint(2, "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;
do {
path = ++sb->qidgen;
} while(path == QPDIR);
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)) {
fprint(2, "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) {
fprint(2, "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);
fprint(2, "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 ||
#ifndef COMPAT32
tag == Tind3 || tag == Tind4 || /* add more Tind tags here ... */
#endif
tag == Tdir)
bp->flags |= Bimm;
putbuf(bp);
putbuf(p);
return a;
}
/*
* what are legal characters in a name?
* only disallow control characters.
* utf avoids control characters, so we
* only need to inspect the ascii range.
*/
int
checkname(char *n)
{
int i, c;
if(n == 0 || *n == 0)
return Ename;
if(*n == '.' && (n[1] == 0 || (n[1] == '.' && n[2] == 0)))
return Edot;
for(i=1; i<NAMELEN; i++) {
c = n[i] & 0xff;
if(c == 0)
return 0;
if(c < 040 || c == '/')
return Ename;
}
return Etoolong;
}
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.file)
snprint(s, sizeof(s), "%c\"%s\"", c, d->wren.file);
else 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 | 0775;
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 = ialloc(sizeof(Msgbuf), 0);
mb->magic = Mbmagic;
mb->xdata = ialloc(LARGEBUF+Slop, 0);
mb->flags = LARGE;
mbfree(mb);
cons.nlarge++;
}
for(i=0; i<conf.nsmmsg; i++) {
mb = ialloc(sizeof(Msgbuf), 0);
mb->magic = Mbmagic;
mb->xdata = ialloc(SMALLBUF+Slop, 0);
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 = ialloc(sizeof(*rb), 0);
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 = ialloc(sizeof(Msgbuf), 0);
mb->xdata = ialloc(LARGEBUF+Slop, 0);
cons.nlarge++;
} else
msgalloc.lmsgbuf = mb->next;
mb->flags = LARGE;
} else {
mb = msgalloc.smsgbuf;
if(mb == nil) {
mb = ialloc(sizeof(Msgbuf), 0);
mb->xdata = ialloc(SMALLBUF+Slop, 0);
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;
if(mb->magic != Mbmagic)
panic("mbfree: bad magic 0x%lux", mb->magic);
if(mb->flags & BTRACE)
fprint(2, "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) {
fprint(2, "%s\n", s1);
s1[0] = 0;
}
}
if(s1[0])
fprint(2, "%s\n", s1);
}
extern int cas(long *p, long ov, long nv);
void*
fs_recv(Queue *q, int)
{
void *a;
long v;
v = q->count;
if(v == 0 || cas(&q->count, v, v-1) == 0)
semacquire(&q->count, 1);
lock(&q->rl);
a = *q->rp;
if(++q->rp >= &q->args[q->size])
q->rp = q->args;
unlock(&q->rl);
semrelease(&q->avail, 1);
return a;
}
void
fs_send(Queue *q, void *a)
{
long v;
v = q->avail;
if(v == 0 || cas(&q->avail, v, v-1) == 0)
semacquire(&q->avail, 1);
lock(&q->wl);
*q->wp = a;
if(++q->wp >= &q->args[q->size])
q->wp = q->args;
unlock(&q->wl);
semrelease(&q->count, 1);
}
Queue*
newqueue(int size, char *name)
{
Queue *q;
q = ialloc(sizeof(Queue) + (size-1)*sizeof(void*), 0);
q->size = size;
q->avail = size;
q->count = 0;
q->rp = q->args;
q->wp = q->args;
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:
fprint(2, "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:
fprint(2, "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:
if(chatty)
print("\tdevream %Z %d\n", d, top);
switch(d->type) {
default:
fprint(2, "devream: 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 (;;) {
if(chatty)
print("recover %Z\n", d);
switch(d->type) {
default:
fprint(2, "devrecover: 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;
if(chatty)
print("\tdevinit %Z\n", d);
switch(d->type) {
default:
fprint(2, "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:
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:
fprint(2, "no swab for tag=%G rw=%d\n", t->tag, flag);
hexdump(p, 256);
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);
}
}