harvey/sys/src/cmd/fossil/9fsys.c

#include "stdinc.h"
#include "dat.h"
#include "fns.h"

#include "9.h"

typedef struct Fsys Fsys;

typedef struct Fsys {
	VtLock* lock;

	char*	name;
	char*	dev;
	char*	venti;

	Fs*	fs;
	VtSession* session;
	int	ref;

	int	noauth;
	int	noperm;
	int	wstatallow;

	Fsys*	next;
} Fsys;

static struct {
	VtLock*	lock;
	Fsys*	head;
	Fsys*	tail;

	char*	curfsys;
} sbox;

static char *_argv0;
#define argv0 _argv0

static char EFsysBusy[] = "fsys: '%s' busy";
static char EFsysExists[] = "fsys: '%s' already exists";
static char EFsysNoCurrent[] = "fsys: no current fsys";
static char EFsysNotFound[] = "fsys: '%s' not found";
static char EFsysNotOpen[] = "fsys: '%s' not open";

static Fsys*
_fsysGet(char* name)
{
	Fsys *fsys;

	if(name == nil || name[0] == '\0')
		name = "main";

	vtRLock(sbox.lock);
	for(fsys = sbox.head; fsys != nil; fsys = fsys->next){
		if(strcmp(name, fsys->name) == 0){
			fsys->ref++;
			break;
		}
	}
	if(fsys == nil)
		vtSetError(EFsysNotFound, name);
	vtRUnlock(sbox.lock);

	return fsys;
}

static int
cmdPrintConfig(int argc, char* argv[])
{
	Fsys *fsys;
	char *usage = "usage: printconfig";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND

	if(argc)
		return cliError(usage);

	vtRLock(sbox.lock);
	for(fsys = sbox.head; fsys != nil; fsys = fsys->next){
		consPrint("\tfsys %s config %s\n", fsys->name, fsys->dev);
		if(fsys->venti && fsys->venti[0])
			consPrint("\tfsys %s venti %q\n", fsys->name, fsys->venti);
	}
	vtRUnlock(sbox.lock);
	return 1;
}

Fsys*
fsysGet(char* name)
{
	Fsys *fsys;

	if((fsys = _fsysGet(name)) == nil)
		return nil;

	vtLock(fsys->lock);
	if(fsys->fs == nil){
		vtSetError(EFsysNotOpen, fsys->name);
		vtUnlock(fsys->lock);
		fsysPut(fsys);
		return nil;
	}
	vtUnlock(fsys->lock);

	return fsys;
}

char*
fsysGetName(Fsys* fsys)
{
	return fsys->name;
}

Fsys*
fsysIncRef(Fsys* fsys)
{
	vtLock(sbox.lock);
	fsys->ref++;
	vtUnlock(sbox.lock);

	return fsys;
}

void
fsysPut(Fsys* fsys)
{
	vtLock(sbox.lock);
	assert(fsys->ref > 0);
	fsys->ref--;
	vtUnlock(sbox.lock);
}

Fs*
fsysGetFs(Fsys* fsys)
{
	assert(fsys != nil && fsys->fs != nil);

	return fsys->fs;
}

void
fsysFsRlock(Fsys* fsys)
{
	vtRLock(fsys->fs->elk);
}

void
fsysFsRUnlock(Fsys* fsys)
{
	vtRUnlock(fsys->fs->elk);
}

int
fsysNoAuthCheck(Fsys* fsys)
{
	return fsys->noauth;
}

int
fsysNoPermCheck(Fsys* fsys)
{
	return fsys->noperm;
}

int
fsysWstatAllow(Fsys* fsys)
{
	return fsys->wstatallow;
}

static char modechars[] = "YUGalLdHSATs";
static ulong modebits[] = {
	ModeSticky,
	ModeSetUid,
	ModeSetGid,
	ModeAppend,
	ModeExclusive,
	ModeLink,
	ModeDir,
	ModeHidden,
	ModeSystem,
	ModeArchive,
	ModeTemporary,
	ModeSnapshot,
	0
};
	
char*
fsysModeString(ulong mode, char *buf)
{
	int i;
	char *p;

	p = buf;
	for(i=0; modebits[i]; i++)
		if(mode & modebits[i])
			*p++ = modechars[i];
	sprint(p, "%luo", mode&0777);
	return buf;
}

int
fsysParseMode(char* s, ulong* mode)
{
	ulong x, y;
	char *p;

	x = 0;
	for(; *s < '0' || *s > '9'; s++){
		if(*s == 0)
			return 0;
		p = strchr(modechars, *s);
		if(p == nil)
			return 0;
		x |= modebits[p-modechars];
	}
	y = strtoul(s, &p, 8);
	if(*p != '\0' || y > 0777)
		return 0;
	*mode = x|y;
	return 1;
}

File*
fsysGetRoot(Fsys* fsys, char* name)
{
	File *root, *sub;

	assert(fsys != nil && fsys->fs != nil);

	root = fsGetRoot(fsys->fs);
	if(name == nil || strcmp(name, "") == 0)
		return root;

	sub = fileWalk(root, name);
	fileDecRef(root);

	return sub;
}

static Fsys*
fsysAlloc(char* name, char* dev)
{
	Fsys *fsys;

	vtLock(sbox.lock);
	for(fsys = sbox.head; fsys != nil; fsys = fsys->next){
		if(strcmp(fsys->name, name) != 0)
			continue;
		vtSetError(EFsysExists, name);
		vtUnlock(sbox.lock);
		return nil;
	}

	fsys = vtMemAllocZ(sizeof(Fsys));
	fsys->lock = vtLockAlloc();
	fsys->name = vtStrDup(name);
	fsys->dev = vtStrDup(dev);

	fsys->ref = 1;

	if(sbox.tail != nil)
		sbox.tail->next = fsys;
	else
		sbox.head = fsys;
	sbox.tail = fsys;
	vtUnlock(sbox.lock);

	return fsys;
}

static int
fsysClose(Fsys* fsys, int argc, char* argv[])
{
	char *usage = "usage: [fsys name] close";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc)
		return cliError(usage);

	return cliError("close isn't working yet; sync and then kill fossil");

	/*
	 * Oooh. This could be hard. What if fsys->ref != 1?
	 * Also, fsClose() either does the job or panics, can we
	 * gracefully detect it's still busy?
	 *
	 * More thought and care needed here.
	 */
	fsClose(fsys->fs);
	fsys->fs = nil;
	vtClose(fsys->session);
	fsys->session = nil;

	if(sbox.curfsys != nil && strcmp(fsys->name, sbox.curfsys) == 0){
		sbox.curfsys = nil;
		consPrompt(nil);
	}

	return 1;
}

static int
fsysVac(Fsys* fsys, int argc, char* argv[])
{
	uchar score[VtScoreSize];
	char *usage = "usage: [fsys name] vac path";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc != 1)
		return cliError(usage);

	if(!fsVac(fsys->fs, argv[0], score))
		return 0;

	consPrint("vac:%V\n", score);
	return 1;
}

static int
fsysSnap(Fsys* fsys, int argc, char* argv[])
{
	int doarchive;
	char *usage = "usage: [fsys name] snap [-a]";

	doarchive = 0;
	ARGBEGIN{
	default:
		return cliError(usage);
	case 'a':
		doarchive = 1;
		break;
	}ARGEND
	if(argc)
		return cliError(usage);

	if(!fsSnapshot(fsys->fs, doarchive))
		return 0;

	return 1;
}

static int
fsysSnapTime(Fsys* fsys, int argc, char* argv[])
{
	char buf[40], *x;
	int hh, mm;
	u32int arch, snap;
	char *usage = "usage: [fsys name] snaptime [-a hhmm] [-s minutes]";

	snapGetTimes(fsys->fs->snap, &arch, &snap);
	ARGBEGIN{
	case 'a':
		x = ARGF();
		if(x == nil)
			return cliError(usage);
		if(strcmp(x, "none") == 0){
			arch = ~(u32int)0;
			break;
		}
		if(strlen(x) != 4 || strspn(x, "0123456789") != 4)
			return cliError(usage);
		hh = (x[0]-'0')*10 + x[1]-'0';
		mm = (x[2]-'0')*10 + x[3]-'0';
		if(hh >= 24 || mm >= 60)
			return cliError(usage);
		arch = hh*60+mm;
		break;
	case 's':
		x = ARGF();
		if(x == nil)
			return cliError(usage);
		if(strcmp(x, "none") == 0){
			snap = ~(u32int)0;
			break;
		}
		snap = atoi(x);
		break;
	default:
		return cliError(usage);
	}ARGEND
	if(argc > 0)
		return cliError(usage);

	snapSetTimes(fsys->fs->snap, arch, snap);
	snapGetTimes(fsys->fs->snap, &arch, &snap);
	if(arch != ~(u32int)0)
		sprint(buf, "-a %02d%02d", arch/60, arch%60);
	else
		sprint(buf, "-a none");
	if(snap != ~(u32int)0)
		sprint(buf+strlen(buf), " -s %d", snap);
	else
		sprint(buf+strlen(buf), " -s none");
	consPrint("\tsnaptime %s\n", buf);
	return 1;
}

static int
fsysSync(Fsys* fsys, int argc, char* argv[])
{
	char *usage = "usage: [fsys name] sync";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc > 0)
		return cliError(usage);

	fsSync(fsys->fs);

	return 1;
}

static int
fsysRemove(Fsys* fsys, int argc, char* argv[])
{
	File *file;
	char *usage = "usage: [fsys name] remove path ...";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc == 0)
		return cliError(usage);

	vtRLock(fsys->fs->elk);
	while(argc > 0){
		if((file = fileOpen(fsys->fs, argv[0])) == nil)
			consPrint("%s: %R\n", argv[0]);
		else{
			if(!fileRemove(file, uidadm))
				consPrint("%s: %R\n", argv[0]);
			fileDecRef(file);
		}
		argc--;
		argv++;
	}
	vtRUnlock(fsys->fs->elk);

	return 1;
}

static int
fsysClri(Fsys* fsys, int argc, char* argv[])
{
	char *usage = "usage: [fsys name] clri path ...";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc == 0)
		return cliError(usage);

	vtRLock(fsys->fs->elk);
	while(argc > 0){
		if(!fileClri(fsys->fs, argv[0], uidadm))
			consPrint("clri %s: %R\n", argv[0]);
		argc--;
		argv++;
	}
	vtRUnlock(fsys->fs->elk);

	return 1;
}

/*
 * Inspect and edit the labels for blocks on disk.
 */
static int
fsysLabel(Fsys* fsys, int argc, char* argv[])
{
	Fs *fs;
	Label l;
	int n, r;
	u32int addr;
	Block *b, *bb;
	char *usage = "usage: [fsys name] label addr [type state epoch epochClose tag]";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc != 1 && argc != 6)
		return cliError(usage);

	r = 0;
	vtRLock(fsys->fs->elk);

	fs = fsys->fs;
	addr = strtoul(argv[0], 0, 0);
	b = cacheLocal(fs->cache, PartData, addr, OReadOnly);
	if(b == nil)
		goto Out0;

	l = b->l;
	consPrint("%slabel %#ux %ud %ud %ud %ud %#x\n",
		argc==6 ? "old: " : "", addr, l.type, l.state,
		l.epoch, l.epochClose, l.tag);

	if(argc == 6){
		if(strcmp(argv[1], "-") != 0)
			l.type = atoi(argv[1]);
		if(strcmp(argv[2], "-") != 0)
			l.state = atoi(argv[2]);
		if(strcmp(argv[3], "-") != 0)
			l.epoch = strtoul(argv[3], 0, 0);
		if(strcmp(argv[4], "-") != 0)
			l.epochClose = strtoul(argv[4], 0, 0);
		if(strcmp(argv[5], "-") != 0)
			l.tag = strtoul(argv[5], 0, 0);

		consPrint("new: label %#ux %ud %ud %ud %ud %#x\n",
			addr, l.type, l.state, l.epoch, l.epochClose, l.tag);
		bb = _blockSetLabel(b, &l);
		if(bb == nil)
			goto Out1;
		n = 0;
		for(;;){
			if(blockWrite(bb)){
				while(bb->iostate != BioClean){
					assert(bb->iostate == BioWriting);
					vtSleep(bb->ioready);
				}
				break;
			}
			consPrint("blockWrite: %R\n");
			if(n++ >= 5){
				consPrint("giving up\n");
				break;
			}
			sleep(5*1000);
		}
		blockPut(bb);
	}
	r = 1;
Out1:
	blockPut(b);
Out0:
	vtRUnlock(fs->elk);

	return r;
}

/*
 * Inspect and edit the blocks on disk.
 */
static int
fsysBlock(Fsys* fsys, int argc, char* argv[])
{
	Fs *fs;
	char *s;
	Block *b;
	uchar *buf;
	u32int addr;
	int c, count, i, offset;
	char *usage = "usage: [fsys name] block addr offset [count [data]]";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc < 2 || argc > 4)
		return cliError(usage);

	fs = fsys->fs;
	addr = strtoul(argv[0], 0, 0);
	offset = strtoul(argv[1], 0, 0);
	if(offset < 0 || offset >= fs->blockSize){
		vtSetError("bad offset");
		return 0;
	}
	if(argc > 2)
		count = strtoul(argv[2], 0, 0);
	else
		count = 100000000;
	if(offset+count > fs->blockSize)
		count = fs->blockSize - count;

	vtRLock(fs->elk);

	b = cacheLocal(fs->cache, PartData, addr, argc==4 ? OReadWrite : OReadOnly);
	if(b == nil){
		vtSetError("cacheLocal %#ux: %R", addr);
		vtRUnlock(fs->elk);
		return 0;
	}

	consPrint("\t%sblock %#ux %ud %ud %.*H\n", 
		argc==4 ? "old: " : "", addr, offset, count, count, b->data+offset);

	if(argc == 4){
		s = argv[3];
		if(strlen(s) != 2*count){
			vtSetError("bad data count");
			goto Out;
		}
		buf = vtMemAllocZ(count);
		for(i = 0; i < count*2; i++){
			if(s[i] >= '0' && s[i] <= '9')
				c = s[i] - '0';
			else if(s[i] >= 'a' && s[i] <= 'f')
				c = s[i] - 'a' + 10;
			else if(s[i] >= 'A' && s[i] <= 'F')
				c = s[i] - 'A' + 10;
			else{
				vtSetError("bad hex");
				vtMemFree(buf);
				goto Out;
			}
			if((i & 1) == 0)
				c <<= 4;
			buf[i>>1] |= c;
		}
		memmove(b->data+offset, buf, count);
		consPrint("\tnew: block %#ux %ud %ud %.*H\n", 
			addr, offset, count, count, b->data+offset);
		blockDirty(b);
	}

Out:
	blockPut(b);
	vtRUnlock(fs->elk);

	return 1;
}

/*
 * Free a disk block.
 */
static int
fsysBfree(Fsys* fsys, int argc, char* argv[])
{
	Fs *fs;
	Label l;
	char *p;
	Block *b;
	u32int addr;
	char *usage = "usage: [fsys name] bfree addr ...";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc == 0)
		return cliError(usage);

	fs = fsys->fs;
	vtRLock(fs->elk);
	while(argc > 0){
		addr = strtoul(argv[0], &p, 0);
		if(*p != '\0'){
			consPrint("bad address - '%s'\n", addr);
			/* syntax error; let's stop */
			vtRUnlock(fs->elk);
			return 0;
		}
		b = cacheLocal(fs->cache, PartData, addr, OReadOnly);
		if(b == nil){
			consPrint("loading %#ux: %R\n", addr);
			continue;
		}
		l = b->l;
		consPrint("label %#ux %ud %ud %ud %ud %#x\n",
			addr, l.type, l.state, l.epoch, l.epochClose, l.tag);
		l.state = BsFree;
		l.type = BtMax;
		l.tag = 0;
		l.epoch = 0;
		l.epochClose = 0;
		if(!blockSetLabel(b, &l))
			consPrint("freeing %#ux: %R\n", addr);
		blockPut(b);
		argc--;
		argv++;
	}
	vtRUnlock(fs->elk);

	return 1;
}

/*
 * Zero an entry or a pointer.
 */
static int
fsysClrep(Fsys* fsys, int argc, char* argv[], int ch)
{
	Fs *fs;
	Entry e;
	Block *b;
	u32int addr;
	int i, max, offset, sz;
	uchar zero[VtEntrySize];
	char *usage = "usage: [fsys name] clr%c addr offset ...";

	ARGBEGIN{
	default:
		return cliError(usage, ch);
	}ARGEND
	if(argc < 2)
		return cliError(usage, ch);

	fs = fsys->fs;
	vtRLock(fsys->fs->elk);

	addr = strtoul(argv[0], 0, 0);
	b = cacheLocal(fs->cache, PartData, addr, argc==4 ? OReadWrite : OReadOnly);
	if(b == nil){
		vtSetError("cacheLocal %#ux: %R", addr);
	Err:
		vtRUnlock(fsys->fs->elk);
		return 0;
	}

	switch(ch){
	default:
		vtSetError("clrep");
		goto Err;
	case 'e':
		if(b->l.type != BtDir){
			vtSetError("wrong block type");
			goto Err;
		}
		sz = VtEntrySize;
		memset(&e, 0, sizeof e);
		entryPack(&e, zero, 0);
		break;
	case 'p':
		if(b->l.type == BtDir || b->l.type == BtData){
			vtSetError("wrong block type");
			goto Err;
		}
		sz = VtScoreSize;
		memmove(zero, vtZeroScore, VtScoreSize);
		break;
	}
	max = fs->blockSize/sz;

	for(i = 1; i < argc; i++){
		offset = atoi(argv[i]);
		if(offset >= max){
			consPrint("\toffset %d too large (>= %d)\n", i, max);
			continue;
		}
		consPrint("\tblock %#ux %d %d %.*H\n", addr, offset*sz, sz, sz, b->data+offset*sz);
		memmove(b->data+offset*sz, zero, sz);
	}
	blockDirty(b);
	blockPut(b);
	vtRUnlock(fsys->fs->elk);

	return 1;
}

static int
fsysClre(Fsys* fsys, int argc, char* argv[])
{
	return fsysClrep(fsys, argc, argv, 'e');
}

static int
fsysClrp(Fsys* fsys, int argc, char* argv[])
{
	return fsysClrep(fsys, argc, argv, 'p');
}

static int
fsysEsearch1(File* f, char* s, u32int elo)
{
	int n, r;
	DirEntry de;
	DirEntryEnum *dee;
	File *ff;
	Entry e, ee;
	char *t;

	dee = deeOpen(f);
	if(dee == nil)
		return 0;

	n = 0;
	for(;;){
		r = deeRead(dee, &de);
		if(r < 0){
			consPrint("\tdeeRead %s/%s: %R\n", s, de.elem);
			break;
		}
		if(r == 0)
			break;
		if(de.mode & ModeSnapshot){
			if((ff = fileWalk(f, de.elem)) == nil)
				consPrint("\tcannot walk %s/%s: %R\n", s, de.elem);
			else{
				if(!fileGetSources(ff, &e, &ee, 0))
					consPrint("\tcannot get sources for %s/%s: %R\n", s, de.elem);
				else if(e.snap != 0 && e.snap < elo){
					consPrint("\t%ud\tclri %s/%s\n", e.snap, s, de.elem);
					n++;
				}
				fileDecRef(ff);
			}
		}
		else if(de.mode & ModeDir){
			if((ff = fileWalk(f, de.elem)) == nil)
				consPrint("\tcannot walk %s/%s: %R\n", s, de.elem);
			else{
				t = smprint("%s/%s", s, de.elem);
				n += fsysEsearch1(ff, t, elo);
				vtMemFree(t);
				fileDecRef(ff);
			}
		}
		deCleanup(&de);
		if(r < 0)
			break;
	}
	deeClose(dee);

	return n;
}
			
static int
fsysEsearch(Fs* fs, char* path, u32int elo)
{
	int n;
	File *f;
	DirEntry de;

	f = fileOpen(fs, path);
	if(f == nil)
		return 0;
	if(!fileGetDir(f, &de)){
		consPrint("\tfileGetDir %s failed: %R\n", path);
		fileDecRef(f);
		return 0;
	}
	if((de.mode & ModeDir) == 0){
		fileDecRef(f);
		deCleanup(&de);
		return 0;
	}
	deCleanup(&de);
	n = fsysEsearch1(f, path, elo);
	fileDecRef(f);
	return n;
}

static int
fsysEpoch(Fsys* fsys, int argc, char* argv[])
{
	Fs *fs;
	int force, n;
	u32int low, old;
	char *usage = "usage: [fsys name] epoch [[-y] low]";

	force = 0;
	ARGBEGIN{
	case 'y':
		force = 1;
		break;
	default:
		return cliError(usage);
	}ARGEND
	if(argc > 1)
		return cliError(usage);
	if(argc > 0)
		low = strtoul(argv[0], 0, 0);
	else
		low = ~(u32int)0;

	fs = fsys->fs;

	vtRLock(fs->elk);
	consPrint("\tlow %ud hi %ud\n", fs->elo, fs->ehi);
	n = fsysEsearch(fsys->fs, "/archive", low);
	n += fsysEsearch(fsys->fs, "/snapshot", low);
	consPrint("\t%d snapshot%s found with epoch < %ud\n", n, n==1 ? "" : "s", low);
	vtRUnlock(fs->elk);

	/*
	 * There's a small race here -- a new snapshot with epoch < low might
	 * get introduced now that we unlocked fs->elk.  Low has to
	 * be <= fs->ehi.  Of course, in order for this to happen low has
	 * to be equal to the current fs->ehi _and_ a snapshot has to 
	 * run right now.  This is a small enough window that I don't care.
	 */
	if(n != 0 && !force){
		consPrint("\tnot setting low epoch\n");
		return 1;
	}
	old = fs->elo;
	if(!fsEpochLow(fs, low))
		consPrint("\tfsEpochLow: %R\n");
	else{
		consPrint("\told: epoch%s %ud\n", force ? " -y" : "", old);
		consPrint("\tnew: epoch%s %ud\n", force ? " -y" : "", fs->elo);
		if(fs->elo < low)
			consPrint("\twarning: new low epoch < old low epoch\n");
	}

	return 1;
}

static int
fsysCreate(Fsys* fsys, int argc, char* argv[])
{
	int r;
	ulong mode;
	char *elem, *p, *path;
	char *usage = "usage: [fsys name] create path uid gid perm";
	DirEntry de;
	File *file, *parent;

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc != 4)
		return cliError(usage);

	if(!fsysParseMode(argv[3], &mode))
		return cliError(usage);
	if(mode&ModeSnapshot)
		return cliError("create - cannot create with snapshot bit set");

	if(strcmp(argv[1], uidnoworld) == 0)
		return cliError("permission denied");

	vtRLock(fsys->fs->elk);
	path = vtStrDup(argv[0]);
	if((p = strrchr(path, '/')) != nil){
		*p++ = '\0';
		elem = p;
		p = path;
		if(*p == '\0')
			p = "/";
	}
	else{
		p = "/";
		elem = path;
	}

	r = 0;
	if((parent = fileOpen(fsys->fs, p)) == nil)
		goto out;

	file = fileCreate(parent, elem, mode, argv[1]);
	fileDecRef(parent);
	if(file == nil){
		vtSetError("create %s/%s: %R", p, elem);
		goto out;
	}

	if(!fileGetDir(file, &de)){
		vtSetError("stat failed after create: %R");
		goto out1;
	}

	if(strcmp(de.gid, argv[2]) != 0){
		vtMemFree(de.gid);		
		de.gid = vtStrDup(argv[2]);
		if(!fileSetDir(file, &de, argv[1])){
			vtSetError("wstat failed after create: %R");
			goto out2;
		}
	}
	r = 1;

out2:
	deCleanup(&de);
out1:
	fileDecRef(file);
out:
	vtMemFree(path);	
	vtRUnlock(fsys->fs->elk);

	return r;
}

static void
fsysPrintStat(char *prefix, char *file, DirEntry *de)
{
	char buf[64];

	if(prefix == nil)
		prefix = "";
	consPrint("%sstat %q %q %q %q %s %llud\n", prefix,
		file, de->elem, de->uid, de->gid, fsysModeString(de->mode, buf), de->size);
}

static int
fsysStat(Fsys* fsys, int argc, char* argv[])
{
	int i;
	File *f;
	DirEntry de;
	char *usage = "usage: [fsys name] stat files...";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND

	if(argc == 0)
		return cliError(usage);

	vtRLock(fsys->fs->elk);
	for(i=0; i<argc; i++){
		if((f = fileOpen(fsys->fs, argv[i])) == nil){
			consPrint("%s: %R\n");
			continue;
		}
		if(!fileGetDir(f, &de)){
			consPrint("%s: %R\n");
			fileDecRef(f);
			continue;
		}
		fsysPrintStat("\t", argv[i], &de);
		deCleanup(&de);
		fileDecRef(f);
	}
	vtRUnlock(fsys->fs->elk);
	return 1;
}

static int
fsysWstat(Fsys *fsys, int argc, char* argv[])
{
	File *f;
	char *p;
	DirEntry de;
	char *usage = "usage: [fsys name] wstat file elem uid gid mode length\n"
		"\tuse - for any field to mean don't change";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND

	if(argc != 6)
		return cliError(usage);

	vtRLock(fsys->fs->elk);
	if((f = fileOpen(fsys->fs, argv[0])) == nil){
		vtSetError("console wstat - walk - %R");
		vtRUnlock(fsys->fs->elk);
		return 0;
	}
	if(!fileGetDir(f, &de)){
		vtSetError("console wstat - stat - %R");
		fileDecRef(f);
		vtRUnlock(fsys->fs->elk);
		return 0;
	}
	fsysPrintStat("\told: w", argv[0], &de);

	if(strcmp(argv[1], "-") != 0){
		if(!validFileName(argv[1])){
			vtSetError("console wstat - bad elem");
			goto error;
		}
		vtMemFree(de.elem);
		de.elem = vtStrDup(argv[1]);
	}
	if(strcmp(argv[2], "-") != 0){
		if(!validUserName(argv[2])){
			vtSetError("console wstat - bad uid");
			goto error;
		}
		vtMemFree(de.uid);
		de.uid = vtStrDup(argv[2]);
	}
	if(strcmp(argv[3], "-") != 0){
		if(!validUserName(argv[3])){
			vtSetError("console wstat - bad gid");
			goto error;
		}
		vtMemFree(de.gid);
		de.gid = vtStrDup(argv[3]);
	}
	if(strcmp(argv[4], "-") != 0){
		if(!fsysParseMode(argv[4], &de.mode)){
			vtSetError("console wstat - bad mode");
			goto error;
		}
	}
	if(strcmp(argv[5], "-") != 0){
		de.size = strtoull(argv[5], &p, 0);
		if(argv[5][0] == '\0' || *p != '\0' || de.size < 0){
			vtSetError("console wstat - bad length");
			goto error;
		}
	}

	if(!fileSetDir(f, &de, uidadm)){
		vtSetError("console wstat - %R");
		goto error;
	}
	deCleanup(&de);

	if(!fileGetDir(f, &de)){
		vtSetError("console wstat - stat2 - %R");
		goto error;
	}
	fsysPrintStat("\tnew: w", argv[0], &de);
	deCleanup(&de);
	fileDecRef(f);
	vtRUnlock(fsys->fs->elk);

	return 1;

error:
	deCleanup(&de);	/* okay to do this twice */
	fileDecRef(f);
	vtRUnlock(fsys->fs->elk);
	return 0;
}

static int
fsysVenti(char* name, int argc, char* argv[])
{
	int r;
	char *host;
	char *usage = "usage: [fsys name] venti [address]";
	Fsys *fsys;

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND

	if(argc == 0)
		host = nil;
	else if(argc == 1)
		host = argv[0];
	else
		return cliError(usage);

	if((fsys = _fsysGet(name)) == nil)
		return 0;

	vtLock(fsys->lock);
	if(host == nil)
		host = fsys->venti;
	else{
		vtMemFree(fsys->venti);
		if(host[0])
			fsys->venti = vtStrDup(host);
		else{
			host = nil;
			fsys->venti = nil;
		}
	}

	/* already open: do a redial */
	if(fsys->fs != nil){
		r = 1;
		if(!vtRedial(fsys->session, host)
		|| !vtConnect(fsys->session, 0))
			r = 0;
		vtUnlock(fsys->lock);
		fsysPut(fsys);
		return r;
	}

	/* not yet open: try to dial */
	if(fsys->session)
		vtClose(fsys->session);
	r = 1;
	if((fsys->session = vtDial(host, 0)) == nil
	|| !vtConnect(fsys->session, 0))
		r = 0;
	vtUnlock(fsys->lock);
	fsysPut(fsys);
	return r;
}

static int
fsysOpen(char* name, int argc, char* argv[])
{
	char *p, *host;
	Fsys *fsys;
	long ncache;
	int noauth, noperm, rflag, wstatallow;
	char *usage = "usage: fsys name open [-APWr] [-c ncache]";

	ncache = 1000;
	noauth = noperm = wstatallow = 0;
	rflag = OReadWrite;

	ARGBEGIN{
	default:
		return cliError(usage);
	case 'A':
		noauth = 1;
		break;
	case 'P':
		noperm = 1;
		break;
	case 'W':
		wstatallow = 1;
		break;
	case 'c':
		p = ARGF();
		if(p == nil)
			return cliError(usage);
		ncache = strtol(argv[0], &p, 0);
		if(ncache <= 0 || p == argv[0] || *p != '\0')
			return cliError(usage);
		break;
	case 'r':
		rflag = OReadOnly;
		break;
	}ARGEND
	if(argc)
		return cliError(usage);

	if((fsys = _fsysGet(name)) == nil)
		return 0;

	vtLock(fsys->lock);
	if(fsys->fs != nil){
		vtSetError(EFsysBusy, fsys->name);
		vtUnlock(fsys->lock);
		fsysPut(fsys);
		return 0;
	}

	if(fsys->session == nil){
		if(fsys->venti && fsys->venti[0])
			host = fsys->venti;
		else
			host = nil;
		fsys->session = vtDial(host, 1);
		if(!vtConnect(fsys->session, nil))
			fprint(2, "warning: connecting to venti: %R\n");
	}
	if((fsys->fs = fsOpen(fsys->dev, fsys->session, ncache, rflag)) == nil){
		vtUnlock(fsys->lock);
		fsysPut(fsys);
		return 0;
	}
	fsys->noauth = noauth;
	fsys->noperm = noperm;
	fsys->wstatallow = wstatallow;
	vtUnlock(fsys->lock);

	fsysPut(fsys);

	return 1;
}

static int
fsysUnconfig(char* name, int argc, char* argv[])
{
	Fsys *fsys, **fp;
	char *usage = "usage: fsys name unconfig";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc)
		return cliError(usage);

	vtLock(sbox.lock);
	fp = &sbox.head;
	for(fsys = *fp; fsys != nil; fsys = fsys->next){
		if(strcmp(fsys->name, name) == 0)
			break;
		fp = &fsys->next;
	}
	if(fsys == nil){
		vtSetError(EFsysNotFound, name);
		vtUnlock(sbox.lock);
		return 0;
	}
	if(fsys->ref != 0 || fsys->fs != nil){
		vtSetError(EFsysBusy, fsys->name);
		vtUnlock(sbox.lock);
		return 0;
	}
	*fp = fsys->next;
	vtUnlock(sbox.lock);

	if(fsys->session != nil){
		vtClose(fsys->session);
		vtFree(fsys->session);
	}
	if(fsys->venti != nil)
		vtMemFree(fsys->venti);
	if(fsys->dev != nil)
		vtMemFree(fsys->dev);
	if(fsys->name != nil)
		vtMemFree(fsys->name);
	vtMemFree(fsys);

	return 1;
}

static int
fsysConfig(char* name, int argc, char* argv[])
{
	Fsys *fsys;
	char *usage = "usage: fsys name config dev";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND
	if(argc != 1)
		return cliError(usage);

	if((fsys = _fsysGet(argv[0])) != nil){
		vtLock(fsys->lock);
		if(fsys->fs != nil){
			vtSetError(EFsysBusy, fsys->name);
			vtUnlock(fsys->lock);
			fsysPut(fsys);
			return 0;
		}
		vtMemFree(fsys->dev);
		fsys->dev = vtStrDup(argv[0]);
		vtUnlock(fsys->lock);
	}
	else if((fsys = fsysAlloc(name, argv[0])) == nil)
		return 0;

	fsysPut(fsys);

	return 1;
}

static struct {
	char*	cmd;
	int	(*f)(Fsys*, int, char**);
	int	(*f1)(char*, int, char**);
} fsyscmd[] = {
	{ "close",	fsysClose, },
	{ "config",	nil, fsysConfig, },
	{ "open",	nil, fsysOpen, },
	{ "unconfig",	nil, fsysUnconfig, },
	{ "venti",	nil, fsysVenti, },

	{ "bfree",	fsysBfree, },
	{ "block",	fsysBlock, },
	{ "clre",	fsysClre, },
	{ "clri",	fsysClri, },
	{ "clrp",	fsysClrp, },
	{ "create",	fsysCreate, },
	{ "epoch",	fsysEpoch, },
	{ "label",	fsysLabel, },
	{ "remove",	fsysRemove, },
	{ "snap",	fsysSnap, },
	{ "snaptime",	fsysSnapTime, },
	{ "stat",	fsysStat, },
	{ "sync",	fsysSync, },
	{ "wstat",	fsysWstat, },
	{ "vac",	fsysVac, },

	{ nil,		nil, },
};

static int
fsysXXX(char* name, int argc, char* argv[])
{
	int i, r;
	Fsys *fsys;

	for(i = 0; fsyscmd[i].cmd != nil; i++){
		if(strcmp(fsyscmd[i].cmd, argv[0]) == 0)
			break;
	}

	if(fsyscmd[i].cmd == nil){
		vtSetError("unknown command - '%s'", argv[0]);
		return 0;
	}

	/* some commands want the name... */
	if(fsyscmd[i].f1 != nil)
		return (*fsyscmd[i].f1)(name, argc, argv);

	/* ... but most commands want the Fsys */
	if((fsys = _fsysGet(name)) == nil)
		return 0;

	vtLock(fsys->lock);
	if(fsys->fs == nil){
		vtUnlock(fsys->lock);
		vtSetError(EFsysNotOpen, name);
		fsysPut(fsys);
		return 0;
	}

	r = (*fsyscmd[i].f)(fsys, argc, argv);
	vtUnlock(fsys->lock);
	fsysPut(fsys);
	return r;
}

static int
cmdFsysXXX(int argc, char* argv[])
{
	char *name;

	if((name = sbox.curfsys) == nil){
		vtSetError(EFsysNoCurrent, argv[0]);
		return 0;
	}

	return fsysXXX(name, argc, argv);
}

static int
cmdFsys(int argc, char* argv[])
{
	Fsys *fsys;
	char *usage = "usage: fsys [name ...]";

	ARGBEGIN{
	default:
		return cliError(usage);
	}ARGEND

	if(argc == 0){
		vtRLock(sbox.lock);
		for(fsys = sbox.head; fsys != nil; fsys = fsys->next)
			consPrint("\t%s\n", fsys->name);
		vtRUnlock(sbox.lock);
		return 1;
	}
	if(argc == 1){
		if((fsys = fsysGet(argv[0])) == nil)
			return 0;
		sbox.curfsys = vtStrDup(fsys->name);
		consPrompt(sbox.curfsys);
		fsysPut(fsys);
		return 1;
	}

	return fsysXXX(argv[0], argc-1, argv+1);
}

int
fsysInit(void)
{
	int i;

	fmtinstall('H', encodefmt);
	fmtinstall('V', scoreFmt);
	fmtinstall('R', vtErrFmt);
	fmtinstall('L', labelFmt);

	sbox.lock = vtLockAlloc();

	cliAddCmd("fsys", cmdFsys);
	for(i = 0; fsyscmd[i].cmd != nil; i++){
		if(fsyscmd[i].f != nil)
			cliAddCmd(fsyscmd[i].cmd, cmdFsysXXX);
	}
	/* the venti cmd is special: the fs can be either open or closed */
	cliAddCmd("venti", cmdFsysXXX);
	cliAddCmd("printconfig", cmdPrintConfig);

	return 1;
}