ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /emu/port/devlogfs.c/
#ifndef EMU
#include "u.h"
#include "../port/lib.h"
#include "../port/error.h"
#else
#include "error.h"
#endif
#include <dat.h>
#include <fns.h>
#include <kernel.h>
#include <logfs.h>
#include <nandfs.h>
#ifndef EMU
#define Sleep sleep
#define Wakeup wakeup
#endif
#ifndef offsetof
#define offsetof(T,X) ((ulong)&(((T*)0)->X))
#endif
typedef struct Devlogfs Devlogfs;
typedef struct DevlogfsSession DevlogfsSession;
//#define CALLTRACE
enum {
DEVLOGFSDEBUG = 0,
DEVLOGFSIODEBUG = 0,
DEVLOGFSBAD = 1,
};
enum {
Qdir,
Qctl,
Qusers,
Qdump,
Qfs,
Qfsboot,
Qend,
};
typedef enum DevlogfsServerState { Closed, BootOpen, NeedVersion, NeedAttach, Attached, Hungup } DevlogfsServerState;
struct Devlogfs {
QLock qlock;
Ref ref;
int instance;
int trace; /* (debugging) trace of read/write actions */
int nand;
char *name;
char *device;
char *filename[Qend - Qfs];
LogfsLowLevel *ll;
Chan *flash, *flashctl;
QLock bootqlock;
int logfstrace;
LogfsBoot *lb;
/* stuff for server */
ulong openflags;
Fcall in;
Fcall out;
int reading;
DevlogfsServerState state;
Rendez readrendez;
Rendez writerendez;
uint readcount;
ulong readbufsize;
uchar *readbuf;
uchar *readp;
LogfsServer *server;
Devlogfs *next;
};
#define MAXMSIZE 8192
static struct {
RWlock rwlock; /* rlock when walking, wlock when changing */
QLock configqlock; /* serialises addition of new configurations */
Devlogfs *head;
char *defname;
} devlogfslist;
static LogfsIdentityStore *is;
#ifndef EMU
char Eunknown[] = "unknown user or group id";
#endif
static void devlogfsfree(Devlogfs*);
#define SPLITPATH(path, qtype, instance, qid, qt) { instance = path >> 4; qid = path & 0xf; qt = qtype & QTDIR; }
#define DATAQID(q, qt) (!(qt) && (q) >= Qfs && (q) < Qend)
#define MKPATH(instance, qid) ((instance << 4) | qid)
#define PREFIX "logfs"
static char *devlogfsprefix = PREFIX;
static char *devlogfsctlname = PREFIX "ctl";
static char *devlogfsusersname = PREFIX "users";
static char *devlogfsdumpname = PREFIX "dump";
static char *devlogfsbootsuffix = "boot";
static char *devlogfs9pversion = "9P2000";
enum {
Toshiba = 0x98,
Samsung = 0xec,
};
static struct {
uchar manufacturer;
uchar device;
} nandtab[] = {
{ 0, 0xe6 },
{ 0, 0xea },
{ 0, 0xe3 },
{ 0, 0xe5 },
{ 0, 0x73 },
{ 0, 0x75 },
{ 0, 0x76 },
};
static void
errorany(char *errmsg)
{
if (errmsg)
error(errmsg);
}
static void *
emalloc(ulong size)
{
void *p;
p = logfsrealloc(nil, size);
if (p == nil)
error(Enomem);
return p;
}
static char *
estrdup(char *q)
{
void *p;
if (q == nil)
return nil;
p = logfsrealloc(nil, strlen(q) + 1);
if (p == nil)
error(Enomem);
return strcpy(p, q);
}
static char *
estrconcat(char *a, ...)
{
va_list l;
char *p, *r;
int t;
t = strlen(a);
va_start(l, a);
while ((p = va_arg(l, char *)) != nil)
t += strlen(p);
r = logfsrealloc(nil, t + 1);
if (r == nil)
error(Enomem);
strcpy(r, a);
va_start(l, a);
while ((p = va_arg(l, char *)) != nil)
strcat(r, p);
va_end(l);
return r;
}
static int
gen(Chan *c, int i, Dir *dp, int lockit)
{
Devlogfs *l;
long size;
Qid qid;
qid.vers = 0;
qid.type = 0;
if (i + Qctl < Qfs) {
switch (i + Qctl) {
case Qctl:
qid.path = Qctl;
devdir(c, qid, devlogfsctlname, 0, eve, 0666, dp);
return 1;
case Qusers:
qid.path = Qusers;
devdir(c, qid, devlogfsusersname, 0, eve, 0444, dp);
return 1;
case Qdump:
qid.path = Qdump;
devdir(c, qid, devlogfsdumpname, 0, eve, 0444, dp);
return 1;
}
}
i -= Qfs - Qctl;
if (lockit)
rlock(&devlogfslist.rwlock);
if (waserror()) {
if (lockit)
runlock(&devlogfslist.rwlock);
nexterror();
}
for (l = devlogfslist.head; l; l = l->next) {
if (i < Qend - Qfs)
break;
i -= Qend - Qfs;
}
if (l == nil) {
poperror();
if (lockit)
runlock(&devlogfslist.rwlock);
return -1;
}
switch (Qfs + i) {
case Qfsboot:
size = l->lb ? logfsbootgetsize(l->lb) : 0;
break;
default:
size = 0;
break;
}
/* perhaps the user id should come from the underlying file */
qid.path = MKPATH(l->instance, Qfs + i);
devdir(c, qid, l->filename[i], size, eve, 0666, dp);
poperror();
if (lockit)
runlock(&devlogfslist.rwlock);
return 1;
}
static int
devlogfsgen(Chan *c, char *n, Dirtab *tab, int ntab, int i, Dir *dp)
{
USED(n);
USED(tab);
USED(ntab);
return gen(c, i, dp, 1);
}
static int
devlogfsgennolock(Chan *c, char *n, Dirtab *tab, int ntab, int i, Dir *dp)
{
USED(n);
USED(tab);
USED(ntab);
return gen(c, i, dp, 0);
}
/* called under lock */
static Devlogfs *
devlogfsfind(int instance)
{
Devlogfs *l;
for (l = devlogfslist.head; l; l = l->next)
if (l->instance == instance)
break;
return l;
}
static Devlogfs *
devlogfsget(int instance)
{
Devlogfs *l;
rlock(&devlogfslist.rwlock);
for (l = devlogfslist.head; l; l = l->next)
if (l->instance == instance)
break;
if (l)
incref(&l->ref);
runlock(&devlogfslist.rwlock);
return l;
}
static Devlogfs *
devlogfsfindbyname(char *name)
{
Devlogfs *l;
rlock(&devlogfslist.rwlock);
for (l = devlogfslist.head; l; l = l->next)
if (strcmp(l->name, name) == 0)
break;
runlock(&devlogfslist.rwlock);
return l;
}
static Devlogfs *
devlogfssetdefname(char *name)
{
Devlogfs *l;
char *searchname;
wlock(&devlogfslist.rwlock);
if (waserror()) {
wunlock(&devlogfslist.rwlock);
nexterror();
}
if (name == nil)
searchname = devlogfslist.defname;
else
searchname = name;
for (l = devlogfslist.head; l; l = l->next)
if (strcmp(l->name, searchname) == 0)
break;
if (l == nil) {
logfsfreemem(devlogfslist.defname);
devlogfslist.defname = nil;
}
else if (name) {
if (devlogfslist.defname) {
logfsfreemem(devlogfslist.defname);
devlogfslist.defname = nil;
}
devlogfslist.defname = estrdup(name);
}
poperror();
wunlock(&devlogfslist.rwlock);
return l;
}
static Chan *
devlogfskopen(char *name, char *suffix, int mode)
{
Chan *c;
char *fn;
int fd;
fn = estrconcat(name, suffix, 0);
fd = kopen(fn, mode);
logfsfreemem(fn);
if (fd < 0)
error(up->env->errstr);
c = fdtochan(up->env->fgrp, fd, mode, 0, 1);
kclose(fd);
return c;
}
static char *
xread(void *a, void *buf, long nbytes, ulong offset)
{
Devlogfs *l = a;
long rv;
if (DEVLOGFSIODEBUG || l->trace)
print("devlogfs: %s: read(0x%lux, %ld)\n", l->device, offset, nbytes);
l->flash->offset = offset;
rv = kchanio(l->flash, buf, nbytes, OREAD);
if (rv < 0) {
print("devlogfs: %s: flash read error: %s\n", l->device, up->env->errstr);
return up->env->errstr;
}
if (rv != nbytes) {
print("devlogfs: %s: short flash read: offset %lud, %ld not %ld\n", l->device, offset, rv, nbytes);
return "short read";
}
return nil;
}
static char *
xwrite(void *a, void *buf, long nbytes, ulong offset)
{
Devlogfs *l = a;
long rv;
if (DEVLOGFSIODEBUG || l->trace)
print("devlogfs: %s: write(0x%lux, %ld)\n", l->device, offset, nbytes);
l->flash->offset = offset;
rv = kchanio(l->flash, buf, nbytes, OWRITE);
if (rv < 0) {
print("devlogfs: %s: flash write error: %s\n", l->device, up->env->errstr);
return up->env->errstr;
}
if (rv != nbytes) {
print("devlogfs: %s: short flash write: offset %lud, %ld not %ld\n", l->device, offset, rv, nbytes);
return "short write";
}
return nil;
}
static char *
xerase(void *a, long address)
{
Devlogfs *l = a;
char cmd[40];
if (DEVLOGFSIODEBUG || l->trace)
print("devlogfs: %s: erase(0x%lux)\n", l->device, address);
snprint(cmd, sizeof(cmd), "erase 0x%8.8lux", address);
if (kchanio(l->flashctl, cmd, strlen(cmd), OWRITE) <= 0) {
print("devlogfs: %s: flash erase error: %s\n", l->device, up->env->errstr);
return up->env->errstr;
}
return nil;
}
static char *
xsync(void *a)
{
Devlogfs *l = a;
uchar statbuf[STATFIXLEN];
if (DEVLOGFSIODEBUG || l->trace)
print("devlogfs: %s: sync()\n", l->device);
memset(statbuf, 0xff, sizeof(statbuf));
memset(statbuf + STATFIXLEN - 8, 0x00, 8);
PBIT16(statbuf, sizeof(statbuf) - BIT16SZ);
if (kwstat(l->device, statbuf, sizeof(statbuf)) < 0)
return up->env->errstr;
return nil;
}
//#define LEAKHUNT
#ifdef LEAKHUNT
#define MAXLIVE 2000
typedef struct Live {
void *p;
int freed;
ulong callerpc;
} Live;
static Live livemem[MAXLIVE];
static void
leakalloc(void *p, ulong callerpc)
{
int x;
int use = -1;
for (x = 0; x < MAXLIVE; x++) {
if (livemem[x].p == p) {
if (!livemem[x].freed)
print("leakalloc: unexpected realloc of 0x%.8lux from 0x%.8lux\n", p, callerpc);
// else
// print("leakalloc: reusing address 0x%.8lux from 0x%.8lux\n", p, callerpc);
livemem[x].freed = 0;
livemem[x].callerpc = callerpc;
return;
}
else if (use < 0 && livemem[x].p == 0)
use = x;
}
if (use < 0)
panic("leakalloc: too many live entries");
livemem[use].p = p;
livemem[use].freed = 0;
livemem[use].callerpc = callerpc;
}
static void
leakaudit(void)
{
int x;
for (x = 0; x < MAXLIVE; x++) {
if (livemem[x].p && !livemem[x].freed)
print("leakaudit: 0x%.8lux from 0x%.8lux\n", livemem[x].p, livemem[x].callerpc);
}
}
static void
leakfree(void *p, ulong callerpc)
{
int x;
if (p == nil)
return;
for (x = 0; x < MAXLIVE; x++) {
if (livemem[x].p == p) {
if (livemem[x].freed)
print("leakfree: double free of 0x%.8lux from 0x%.8lux, originally by 0x%.8lux\n",
p, callerpc, livemem[x].callerpc);
livemem[x].freed = 1;
livemem[x].callerpc = callerpc;
return;
}
}
print("leakfree: free of unalloced address 0x%.8lux from 0x%.8lux\n", p, callerpc);
leakaudit();
}
static void
leakrealloc(void *newp, void *oldp, ulong callerpc)
{
leakfree(oldp, callerpc);
leakalloc(newp, callerpc);
}
#endif
#ifdef LEAKHUNT
static void *_realloc(void *p, ulong size, ulong callerpc)
#else
void *
logfsrealloc(void *p, ulong size)
#endif
{
void *q;
ulong osize;
if (waserror()) {
print("wobbly thrown in memory allocator: %s\n", up->env->errstr);
nexterror();
}
if (p == nil) {
q = smalloc(size);
poperror();
#ifdef LEAKHUNT
leakrealloc(q, nil, callerpc);
#endif
return q;
}
q = realloc(p, size);
if (q) {
poperror();
#ifdef LEAKHUNT
leakrealloc(q, p, callerpc);
#endif
return q;
}
q = smalloc(size);
osize = msize(p);
if (osize > size)
osize = size;
memmove(q, p, osize);
free(p);
poperror();
#ifdef LEAKHUNT
leakrealloc(q, p, callerpc);
#endif
return q;
}
#ifdef LEAKHUNT
void *
logfsrealloc(void *p, ulong size)
{
return _realloc(p, size, getcallerpc(&p));
}
void *
nandfsrealloc(void *p, ulong size)
{
return _realloc(p, size, getcallerpc(&p));
}
#else
void *
nandfsrealloc(void *p, ulong size)
{
return logfsrealloc(p, size);
}
#endif
void
logfsfreemem(void *p)
{
#ifdef LEAKHUNT
leakfree(p, getcallerpc(&p));
#endif
free(p);
}
void
nandfsfreemem(void *p)
{
#ifdef LEAKHUNT
leakfree(p, getcallerpc(&p));
#endif
free(p);
}
static Devlogfs *
devlogfsconfig(char *name, char *device)
{
Devlogfs *newl, *l;
int i;
int n;
char buf[100], *fields[8];
long rawblocksize, rawsize;
newl = nil;
qlock(&devlogfslist.configqlock);
if (waserror()) {
qunlock(&devlogfslist.configqlock);
devlogfsfree(newl);
nexterror();
}
rlock(&devlogfslist.rwlock);
for (l = devlogfslist.head; l; l = l->next)
if (strcmp(l->name, name) == 0) {
runlock(&devlogfslist.rwlock);
error(Einuse);
}
/* horrid n^2 solution to finding a unique instance number */
for (i = 0;; i++) {
for (l = devlogfslist.head; l; l = l->next)
if (l->instance == i)
break;
if (l == nil)
break;
}
runlock(&devlogfslist.rwlock);
newl = emalloc(sizeof(Devlogfs));
newl->instance = i;
newl->name = estrdup(name);
newl->device = estrdup(device);
newl->filename[Qfs - Qfs] = estrconcat(devlogfsprefix, name, nil);
newl->filename[Qfsboot - Qfs] = estrconcat(devlogfsprefix, name, devlogfsbootsuffix, nil);
newl->flash = devlogfskopen(device, nil, ORDWR);
newl->flashctl = devlogfskopen(device, "ctl", ORDWR);
newl->flashctl->offset = 0;
if ((n = kchanio(newl->flashctl, buf, sizeof(buf), OREAD)) <= 0) {
print("devlogfsconfig: read ctl failed: %s\n", up->env->errstr);
error(up->env->errstr);
}
if (n >= sizeof(buf))
n = sizeof(buf) - 1;
buf[n] = 0;
n = getfields(buf, fields, nelem(fields), 1, " \t\n");
newl->nand = 0;
if (n >= 2) {
/* detect NAND devices, and learn parameters from there */
ulong manufacturer = strtoul(fields[0], nil, 16);
ulong device = strtoul(fields[1], nil, 16);
int d;
for (d = 0; d < sizeof(nandtab) / sizeof(nandtab[0]); d++) {
if ((nandtab[d].manufacturer == manufacturer
&& nandtab[d].device == device)
|| (nandtab[d].manufacturer == 0
&& (manufacturer == Toshiba || manufacturer == Samsung)
&& nandtab[d].device == device))
{
if (DEVLOGFSDEBUG)
print("devlogfsconfig: nand device detected\n");
newl->nand = 1;
break;
}
}
}
if (n < 4)
error("unknown erase size");
rawblocksize = strtol(fields[5], nil, 0);
rawsize = strtol(fields[4], nil, 0)-strtol(fields[3], nil, 0);
if (newl->nand == 0)
error("only NAND supported at the moment");
errorany(nandfsinit(newl, rawsize, rawblocksize, xread, xwrite, xerase, xsync, &newl->ll));
wlock(&devlogfslist.rwlock);
newl->next = devlogfslist.head;
devlogfslist.head = newl;
logfsfreemem(devlogfslist.defname);
devlogfslist.defname = nil;
if (waserror()) {
}
else {
devlogfslist.defname = estrdup(name);
poperror();
}
wunlock(&devlogfslist.rwlock);
poperror();
qunlock(&devlogfslist.configqlock);
return newl;
}
void
devlogfsunconfig(Devlogfs *devlogfs)
{
Devlogfs **lp;
qlock(&devlogfslist.configqlock);
if (waserror()) {
qunlock(&devlogfslist.configqlock);
nexterror();
}
wlock(&devlogfslist.rwlock);
if (waserror()) {
wunlock(&devlogfslist.rwlock);
nexterror();
}
for (lp = &devlogfslist.head; *lp && (*lp) != devlogfs; lp = &(*lp)->next)
;
if (*lp == nil) {
if (DEVLOGFSBAD)
print("devlogfsunconfig: not in list\n");
}
else
*lp = devlogfs->next;
poperror();
wunlock(&devlogfslist.rwlock);
/* now invisible to the naked eye */
devlogfsfree(devlogfs);
poperror();
qunlock(&devlogfslist.configqlock);
}
static void
devlogfsllopen(Devlogfs *l)
{
qlock(&l->qlock);
if (waserror()) {
qunlock(&l->qlock);
nexterror();
}
if (l->lb == nil)
errorany(logfsbootopen(l->ll, 0, 0, l->logfstrace, 1, &l->lb));
l->state = BootOpen;
poperror();
qunlock(&l->qlock);
}
static void
devlogfsllformat(Devlogfs *l, long bootsize)
{
qlock(&l->qlock);
if (waserror()) {
qunlock(&l->qlock);
nexterror();
}
if (l->lb == nil)
errorany(logfsformat(l->ll, 0, 0, bootsize, l->logfstrace));
poperror();
qunlock(&l->qlock);
}
static Chan *
devlogfsattach(char *spec)
{
Chan *c;
#ifdef CALLTRACE
print("devlogfsattach(spec = %s) - start\n", spec);
#endif
/* create the identity store on first attach */
if (is == nil)
errorany(logfsisnew(&is));
c = devattach(0x29f, spec);
// c = devattach(L'ʟ', spec);
#ifdef CALLTRACE
print("devlogfsattach(spec = %s) - return %.8lux\n", spec, (ulong)c);
#endif
return c;
}
static Walkqid*
devlogfswalk(Chan *c, Chan *nc, char **name, int nname)
{
int instance, qid, qt, clone;
Walkqid *wq;
#ifdef CALLTRACE
print("devlogfswalk(c = 0x%.8lux, nc = 0x%.8lux, name = 0x%.8lux, nname = %d) - start\n",
(ulong)c, (ulong)nc, (ulong)name, nname);
#endif
clone = 0;
if(nc == nil){
nc = devclone(c);
nc->type = 0;
SPLITPATH(c->qid.path, c->qid.type, instance, qid, qt);
if(DATAQID(qid, qt))
nc->aux = devlogfsget(instance);
clone = 1;
}
wq = devwalk(c, nc, name, nname, 0, 0, devlogfsgen);
if (wq == nil || wq->nqid < nname) {
if(clone)
cclose(nc);
}
else if (clone) {
wq->clone = nc;
nc->type = c->type;
}
#ifdef CALLTRACE
print("devlogfswalk(c = 0x%.8lux, nc = 0x%.8lux, name = 0x%.8lux, nname = %d) - return\n",
(ulong)c, (ulong)nc, (ulong)name, nname);
#endif
return wq;
}
static int
devlogfsstat(Chan *c, uchar *dp, int n)
{
#ifdef CALLTRACE
print("devlogfsstat(c = 0x%.8lux, dp = 0x%.8lux n= %d)\n",
(ulong)c, (ulong)dp, n);
#endif
return devstat(c, dp, n, 0, 0, devlogfsgen);
}
static Chan*
devlogfsopen(Chan *c, int omode)
{
int instance, qid, qt;
omode = openmode(omode);
SPLITPATH(c->qid.path, c->qid.type, instance, qid, qt);
#ifdef CALLTRACE
print("devlogfsopen(c = 0x%.8lux, omode = %o, instance = %d, qid = %d, qt = %d)\n",
(ulong)c, omode, instance, qid, qt);
#endif
rlock(&devlogfslist.rwlock);
if (waserror()) {
runlock(&devlogfslist.rwlock);
#ifdef CALLTRACE
print("devlogfsopen(c = 0x%.8lux, omode = %o) - error %s\n", (ulong)c, omode, up->env->errstr);
#endif
nexterror();
}
if (DATAQID(qid, qt)) {
Devlogfs *d;
d = devlogfsfind(instance);
if (d == nil)
error(Enodev);
if (strcmp(up->env->user, eve) != 0)
error(Eperm);
if (qid == Qfs && d->state != BootOpen)
error(Eperm);
if (d->server == nil) {
errorany(logfsservernew(d->lb, d->ll, is, d->openflags, d->logfstrace, &d->server));
d->state = NeedVersion;
}
c = devopen(c, omode, 0, 0, devlogfsgennolock);
incref(&d->ref);
c->aux = d;
}
else if (qid == Qctl || qid == Qusers) {
if (strcmp(up->env->user, eve) != 0)
error(Eperm);
c = devopen(c, omode, 0, 0, devlogfsgennolock);
}
else
c = devopen(c, omode, 0, 0, devlogfsgennolock);
poperror();
runlock(&devlogfslist.rwlock);
#ifdef CALLTRACE
print("devlogfsopen(c = 0x%.8lux, omode = %o) - return\n", (ulong)c, omode);
#endif
return c;
}
static void
devlogfsclose(Chan *c)
{
int instance, qid, qt;
#ifdef CALLTRACE
print("devlogfsclose(c = 0x%.8lux)\n", (ulong)c);
#endif
SPLITPATH(c->qid.path, c->qid.type, instance, qid, qt);
USED(instance);
if(DATAQID(qid, qt) && (c->flag & COPEN) != 0) {
Devlogfs *d;
d = c->aux;
qlock(&d->qlock);
if (qid == Qfs && d->state == Attached) {
logfsserverflush(d->server);
logfsserverfree(&d->server);
d->state = BootOpen;
}
qunlock(&d->qlock);
decref(&d->ref);
}
#ifdef CALLTRACE
print("devlogfsclose(c = 0x%.8lux) - return\n", (ulong)c);
#endif
}
typedef char *(SMARTIOFN)(void *magic, void *buf, long n, ulong offset, int write);
void
smartio(SMARTIOFN *io, void *magic, void *buf, long n, ulong offset, long blocksize, int write)
{
void *tmp = nil;
ulong blocks, toread;
if (waserror()) {
logfsfreemem(tmp);
nexterror();
}
if (offset % blocksize) {
ulong aoffset;
int tmpoffset;
int tocopy;
if (tmp == nil)
tmp = emalloc(blocksize);
aoffset = offset / blocksize;
aoffset *= blocksize;
errorany((*io)(magic, tmp, blocksize, aoffset, 0));
tmpoffset = offset - aoffset;
tocopy = blocksize - tmpoffset;
if (tocopy > n)
tocopy = n;
if (write) {
memmove((uchar *)tmp + tmpoffset, buf, tocopy);
errorany((*io)(magic, tmp, blocksize, aoffset, 1));
}
else
memmove(buf, (uchar *)tmp + tmpoffset, tocopy);
buf = (uchar *)buf + tocopy;
n -= tocopy;
offset = aoffset + blocksize;
}
blocks = n / blocksize;
toread = blocks * blocksize;
errorany((*io)(magic, buf, toread, offset, write));
buf = (uchar *)buf + toread;
n -= toread;
offset += toread;
if (n) {
if (tmp == nil)
tmp = emalloc(blocksize);
errorany((*io)(magic, tmp, blocksize, offset, 0));
if (write) {
memmove(tmp, buf, n);
errorany((*io)(magic, tmp, blocksize, offset, 1));
}
memmove(buf, tmp, n);
}
poperror();
logfsfreemem(tmp);
}
static int
readok(void *a)
{
Devlogfs *d = a;
return d->reading;
}
static int
writeok(void *a)
{
Devlogfs *d = a;
return !d->reading;
}
long
devlogfsserverread(Devlogfs *d, void *buf, long n)
{
if (d->state == Hungup)
error(Ehungup);
Sleep(&d->readrendez, readok, d);
if (n > d->readcount)
n = d->readcount;
memmove(buf, d->readp, n);
d->readp += n;
d->readcount -= n;
if (d->readcount == 0) {
d->reading = 0;
Wakeup(&d->writerendez);
}
return n;
}
static void
reply(Devlogfs *d)
{
d->readp = d->readbuf;
d->readcount = convS2M(&d->out, d->readp, d->readbufsize);
//print("reply is %d bytes\n", d->readcount);
if (d->readcount == 0)
panic("logfs: reply: did not fit\n");
d->reading = 1;
Wakeup(&d->readrendez);
}
static void
rerror(Devlogfs *d, char *ename)
{
d->out.type = Rerror;
d->out.ename = ename;
reply(d);
}
static struct {
QLock qlock;
int (*read)(void *magic, Devlogfs *d, int line, char *buf, int buflen);
void *magic;
Devlogfs *d;
int line;
} dump;
static void *
extentdumpinit(Devlogfs *d, int argc, char **argv)
{
int *p;
ulong path;
ulong flashaddr, length;
long block;
int page, offset;
if (argc != 1)
error(Ebadarg);
path = strtoul(argv[0], 0, 0);
errorany(logfsserverreadpathextent(d->server, path, 0, &flashaddr, &length, &block, &page, &offset));
p = emalloc(sizeof(ulong));
*p = path;
return p;
}
static int
extentdumpread(void *magic, Devlogfs *d, int line, char *buf, int buflen)
{
ulong *p = magic;
ulong flashaddr, length;
long block;
int page, offset;
USED(d);
errorany(logfsserverreadpathextent(d->server, *p, line, &flashaddr, &length, &block, &page, &offset));
if (length == 0)
return 0;
return snprint(buf, buflen, "%.8ux %ud %ld %d %d\n", flashaddr, length, block, page, offset);
}
void
devlogfsdumpinit(Devlogfs *d,
void *(*init)(Devlogfs *d, int argc, char **argv),
int (*read)(void *magic, Devlogfs *d, int line, char *buf, int buflen), int argc, char **argv)
{
qlock(&dump.qlock);
if (waserror()) {
qunlock(&dump.qlock);
nexterror();
}
if (d) {
if (d->state < NeedVersion)
error("not mounted");
qlock(&d->qlock);
if (waserror()) {
qunlock(&d->qlock);
nexterror();
}
}
if (dump.magic) {
logfsfreemem(dump.magic);
dump.magic = nil;
}
dump.d = d;
dump.magic = (*init)(d, argc, argv);
dump.read = read;
dump.line = 0;
if (d) {
poperror();
qunlock(&d->qlock);
}
poperror();
qunlock(&dump.qlock);
}
long
devlogfsdumpread(char *buf, int buflen)
{
char *tmp = nil;
long n;
qlock(&dump.qlock);
if (waserror()) {
logfsfreemem(tmp);
qunlock(&dump.qlock);
nexterror();
}
if (dump.magic == nil)
error(Eio);
tmp = emalloc(READSTR);
if (dump.d) {
if (dump.d->state < NeedVersion)
error("not mounted");
qlock(&dump.d->qlock);
if (waserror()) {
qunlock(&dump.d->qlock);
nexterror();
}
}
n = (*dump.read)(dump.magic, dump.d, dump.line, tmp, READSTR);
if (n) {
dump.line++;
n = readstr(0, buf, buflen, tmp);
}
if (dump.d) {
poperror();
qunlock(&dump.d->qlock);
}
logfsfreemem(tmp);
poperror();
qunlock(&dump.qlock);
return n;
}
void
devlogfsserverlogsweep(Devlogfs *d, int justone)
{
int didsomething;
if (d->state < NeedVersion)
error("not mounted");
qlock(&d->qlock);
if (waserror()) {
qunlock(&d->qlock);
nexterror();
}
errorany(logfsserverlogsweep(d->server, justone, &didsomething));
poperror();
qunlock(&d->qlock);
}
void
devlogfsserverwrite(Devlogfs *d, void *buf, long n)
{
int locked = 0;
if (d->state == Hungup)
error(Ehungup);
Sleep(&d->writerendez, writeok, d);
if (convM2S(buf, n, &d->in) != n) {
/*
* someone is writing drivel; have nothing to do with them anymore
* most common cause; trying to mount authenticated
*/
d->state = Hungup;
error(Ehungup);
}
d->out.tag = d->in.tag;
d->out.fid = d->in.fid;
d->out.type = d->in.type + 1;
if (waserror()) {
if (locked)
qunlock(&d->qlock);
rerror(d, up->env->errstr);
return;
}
if (d->in.type != Tversion && d->in.type != Tattach) {
if (d->state != Attached)
error("must be attached");
qlock(&d->qlock);
locked = 1;
}
switch (d->in.type) {
case Tauth:
error("no authentication needed");
case Tversion: {
char *rversion;
if (d->state != NeedVersion)
error("unexpected Tversion");
if (d->in.tag != NOTAG)
error("protocol botch");
/*
* check the version string
*/
if (strcmp(d->in.version, devlogfs9pversion) != 0)
rversion = "unknown";
else
rversion = devlogfs9pversion;
/*
* allocate the reply buffer
*/
d->readbufsize = d->in.msize;
if (d->readbufsize > MAXMSIZE)
d->readbufsize = MAXMSIZE;
d->readbuf = emalloc(d->readbufsize);
/*
* compose the Rversion
*/
d->out.msize = d->readbufsize;
d->out.version = rversion;
d->state = NeedAttach;
break;
}
case Tattach:
if (d->state != NeedAttach)
error("unexpected attach");
if (d->in.afid != NOFID)
error("unexpected afid");
errorany(logfsserverattach(d->server, d->in.fid, d->in.uname, &d->out.qid));
d->state = Attached;
break;
case Tclunk:
errorany(logfsserverclunk(d->server, d->in.fid));
break;
case Tcreate:
errorany(logfsservercreate(d->server, d->in.fid, d->in.name, d->in.perm, d->in.mode, &d->out.qid));
d->out.iounit = d->readbufsize - 11;
break;
case Tflush:
break;
case Topen:
errorany(logfsserveropen(d->server, d->in.fid, d->in.mode, &d->out.qid));
d->out.iounit = d->readbufsize - 11;
break;
case Tread:
d->out.data = (char *)d->readbuf + 11;
/* TODO - avoid memmove */
errorany(logfsserverread(d->server, d->in.fid, d->in.offset, d->in.count, (uchar *)d->out.data,
d->readbufsize - 11, &d->out.count));
break;
case Tremove:
errorany(logfsserverremove(d->server, d->in.fid));
break;
case Tstat:
d->out.stat = d->readbuf + 9;
/* TODO - avoid memmove */
errorany(logfsserverstat(d->server, d->in.fid, d->out.stat, d->readbufsize - 9, &d->out.nstat));
// print("nstat %d\n", d->out.nstat);
break;
case Twalk:
errorany(logfsserverwalk(d->server, d->in.fid, d->in.newfid,
d->in.nwname, d->in.wname, &d->out.nwqid, d->out.wqid));
break;
case Twrite:
errorany(logfsserverwrite(d->server, d->in.fid, d->in.offset, d->in.count, (uchar *)d->in.data,
&d->out.count));
break;
case Twstat:
errorany(logfsserverwstat(d->server, d->in.fid, d->in.stat, d->in.nstat));
break;
default:
print("devlogfsserverwrite: msg %d unimplemented\n", d->in.type);
error("unimplemented");
}
poperror();
if (locked)
qunlock(&d->qlock);
reply(d);
}
static long
devlogfsread(Chan *c, void *buf, long n, vlong off)
{
int instance, qid, qt;
SPLITPATH(c->qid.path, c->qid.type, instance, qid, qt);
USED(instance);
#ifdef CALLTRACE
print("devlogfsread(c = 0x%.8lux, buf = 0x%.8lux, n = %ld, instance = %d, qid = %d, qt = %d) - start\n",
(ulong)c, (ulong)buf, n, instance, qid, qt);
#endif
if(qt & QTDIR) {
#ifdef CALLTRACE
print("devlogfsread(c = 0x%.8lux, buf = 0x%.8lux, n = %ld, instance = %d, qid = %d, qt = %d) - calling devdirread\n",
(ulong)c, (ulong)buf, n, instance, qid, qt);
#endif
return devdirread(c, buf, n, 0, 0, devlogfsgen);
}
if(DATAQID(qid, qt)) {
if (qid == Qfsboot) {
Devlogfs *l = c->aux;
qlock(&l->bootqlock);
if (waserror()) {
qunlock(&l->bootqlock);
nexterror();
}
smartio((SMARTIOFN *)logfsbootio, l->lb, buf, n, off, logfsbootgetiosize(l->lb), 0);
poperror();
qunlock(&l->bootqlock);
return n;
}
else if (qid == Qfs) {
Devlogfs *d = c->aux;
return devlogfsserverread(d, buf, n);
}
error(Eio);
}
if (qid == Qusers) {
long nr;
errorany(logfsisusersread(is, buf, n, (ulong)off, &nr));
return nr;
}
else if (qid == Qdump)
return devlogfsdumpread(buf, n);
if (qid != Qctl)
error(Egreg);
return 0;
}
static long
devlogfswrite(Chan *c, void *buf, long n, vlong off)
{
char cmd[64], *realfields[6];
int i;
int instance, qid, qt;
if(n <= 0)
return 0;
SPLITPATH(c->qid.path, c->qid.type, instance, qid, qt);
#ifdef CALLTRACE
print("devlogfswrite(c = 0x%.8lux, buf = 0x%.8lux, n = %ld, instance = %d, qid = %d, qt = %d) - start\n",
(ulong)c, (ulong)buf, n, instance, qid, qt);
#endif
USED(instance);
if(DATAQID(qid, qt)){
if (qid == Qfsboot) {
Devlogfs *l = c->aux;
qlock(&l->bootqlock);
if (waserror()) {
qunlock(&l->bootqlock);
nexterror();
}
smartio((SMARTIOFN *)logfsbootio, l->lb, buf, n, off, logfsbootgetiosize(l->lb), 1);
poperror();
qunlock(&l->bootqlock);
return n;
}
else if (qid == Qfs) {
Devlogfs *d = c->aux;
devlogfsserverwrite(d, buf, n);
return n;
}
error(Eio);
}
else if (qid == Qctl) {
Devlogfs *l = nil;
char **fields;
if(n > sizeof(cmd)-1)
n = sizeof(cmd)-1;
memmove(cmd, buf, n);
cmd[n] = 0;
i = getfields(cmd, realfields, 6, 1, " \t\n");
//print("i = %d\n", i);
if (i <= 0)
error(Ebadarg);
fields = realfields;
if (i == 3 && strcmp(fields[0], "uname") == 0) {
switch (fields[2][0]) {
default:
errorany(logfsisgroupcreate(is, fields[1], fields[2]));
break;
case ':':
errorany(logfsisgroupcreate(is, fields[1], fields[2] + 1));
break;
case '%':
errorany(logfsisgrouprename(is, fields[1], fields[2] + 1));
break;
case '=':
errorany(logfsisgroupsetleader(is, fields[1], fields[2] + 1));
break;
case '+':
errorany(logfsisgroupaddmember(is, fields[1], fields[2] + 1));
break;
case '-':
errorany(logfsisgroupremovemember(is, fields[1], fields[2] + 1));
break;
}
i = 0;
}
if (i == 4 && strcmp(fields[0], "fsys") == 0 && strcmp(fields[2], "config") == 0) {
l = devlogfsconfig(fields[1], fields[3]);
i = 0;
}
else if (i >= 2 && strcmp(fields[0], "fsys") == 0) {
l = devlogfssetdefname(fields[1]);
if (l == nil)
error(Ebadarg);
i -= 2;
fields += 2;
}
if (i != 0) {
if (l == nil)
l = devlogfssetdefname(nil);
if (i >= 1 && strcmp(fields[0], "open") == 0) {
int a;
if (l == nil)
error(Ebadarg);
for (a = 1; a < i; a++)
if (fields[a][0] == '-')
switch (fields[a][1]) {
case 'P':
l->openflags |= LogfsOpenFlagNoPerm;
break;
case 'W':
l->openflags |= LogfsOpenFlagWstatAllow;
break;
default:
error(Ebadarg);
}
devlogfsllopen(l);
i = 0;
}
else if (i == 2 && strcmp(fields[0], "format") == 0) {
if (l == nil)
error(Ebadarg);
devlogfsllformat(l, strtol(fields[1], nil, 0));
i = 0;
}
else if (i >= 1 && strcmp(fields[0], "sweep") == 0) {
if (l == nil)
error(Ebadarg);
devlogfsserverlogsweep(l, 0);
i = 0;
}
else if (i >= 1 && strcmp(fields[0], "sweepone") == 0) {
if (l == nil)
error(Ebadarg);
devlogfsserverlogsweep(l, 1);
i = 0;
}
else if (i <= 2&& strcmp(fields[0], "trace") == 0) {
if (l == nil)
error(Ebadarg);
l->logfstrace = i > 1 ? strtol(fields[1], nil, 0) : 0;
if (l->server)
logfsservertrace(l->server, l->logfstrace);
if (l->lb)
logfsboottrace(l->lb, l->logfstrace);
i = 0;
}
else if (i == 1 && strcmp(fields[0], "unconfig") == 0) {
if (l == nil)
error(Ebadarg);
if (l->ref.ref > 0)
error(Einuse);
devlogfsunconfig(l);
i = 0;
}
else if (i == 2 && strcmp(fields[0], "extent") == 0) {
if (l == nil)
error(Ebadarg);
devlogfsdumpinit(l, extentdumpinit, extentdumpread, i - 1, fields + 1);
i = 0;
}
else if (i >= 2 && strcmp(fields[0], "test") == 0) {
if (l == nil)
error(Ebadarg);
errorany(logfsservertestcmd(l->server, i - 1, fields + 1));
i = 0;
}
#ifdef LEAKHUNT
else if (i == 1 && strcmp(fields[0], "leakaudit") == 0) {
leakaudit();
i = 0;
}
#endif
}
if (i != 0)
error(Ebadarg);
return n;
}
error(Egreg);
return 0; /* not reached */
}
static void
devlogfsfree(Devlogfs *devlogfs)
{
if (devlogfs != nil) {
int i;
logfsfreemem(devlogfs->device);
logfsfreemem(devlogfs->name);
for (i = 0; i < Qend - Qfs; i++)
logfsfreemem(devlogfs->filename[i]);
cclose(devlogfs->flash);
cclose(devlogfs->flashctl);
qlock(&devlogfs->qlock);
logfsserverfree(&devlogfs->server);
logfsbootfree(devlogfs->lb);
if (devlogfs->ll)
(*devlogfs->ll->free)(devlogfs->ll);
logfsfreemem(devlogfs->readbuf);
qunlock(&devlogfs->qlock);
logfsfreemem(devlogfs);
}
}
#ifdef EMU
ulong
logfsnow(void)
{
extern vlong timeoffset;
return (timeoffset + osusectime()) / 1000000;
}
#endif
Dev logfsdevtab = {
0x29f,
// L'ʟ',
"logfs",
#ifndef EMU
devreset,
#endif
devinit,
#ifndef EMU
devshutdown,
#endif
devlogfsattach,
devlogfswalk,
devlogfsstat,
devlogfsopen,
devcreate,
devlogfsclose,
devlogfsread,
devbread,
devlogfswrite,
devbwrite,
devremove,
devwstat,
};