shithub: gefs

ref: 81129e88677f7d4e6b71be8b6aa2f9136caeb617
dir: /main.c/

#include <u.h>
#include <libc.h>
#include <avl.h>
#include <fcall.h>

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

Gefs *fs;

int	ream;
int	debug;
int	noauth;
int	nproc;
char	*forceuser;
char	*srvname = "gefs";
int	cachesz = 512*MiB;

vlong
inc64(vlong *v, vlong dv)
{
	vlong ov, nv;

	while(1){
		ov = *v;
		nv = ov + dv;
		if(cas64((u64int*)v, ov, nv))
			return ov;
	}
}

static void
initfs(vlong cachesz)
{
	if((fs = mallocz(sizeof(Gefs), 1)) == nil)
		sysfatal("malloc: %r");

	fs->noauth = noauth;
	fs->cmax = cachesz/Blksz;
	if(fs->cmax >= (2ULL*GiB)/sizeof(Bucket))
		sysfatal("cache too big");
	if((fs->cache = mallocz(fs->cmax*sizeof(Bucket), 1)) == nil)
		sysfatal("malloc: %r");
}

static void
launch(void (*f)(int, void *), int wid, void *arg, char *text)
{
	int pid;

	assert(wid == -1 || wid < nelem(fs->active));
	pid = rfork(RFPROC|RFMEM|RFNOWAIT);
	if (pid < 0)
		sysfatal("can't fork: %r");
	if (pid == 0) {
		procsetname("%s", text);
		(*f)(wid, arg);
		exits("child returned");
	}
}

static int
postfd(char *name, char *suff)
{
	char buf[80];
	int fd[2];
	int cfd;

	if(pipe(fd) < 0)
		sysfatal("can't make a pipe");
	snprint(buf, sizeof buf, "/srv/%s%s", name, suff);
	if((cfd = create(buf, OWRITE|ORCLOSE|OCEXEC, 0600)) == -1)
		sysfatal("create %s: %r", buf);
	if(fprint(cfd, "%d", fd[0]) == -1)
		sysfatal("write %s: %r", buf);
	close(fd[0]);
	return fd[1];
}

static void
usage(void)
{
	fprint(2, "usage: %s [-rA] [-m mem] [-s srv] [-u usr] dev\n", argv0);
	exits("usage");
}

void
main(int argc, char **argv)
{
	int i, srvfd, ctlfd;
	char *s;

	ARGBEGIN{
	case 'r':
		ream = 1;
		break;
	case 'm':
		cachesz = strtoll(EARGF(usage()), nil, 0)*MiB;
		break;
	case 'd':
		debug++;
		break;
	case 's':
		srvname = EARGF(usage());
		break;
	case 'A':
		noauth = 1;
		break;
	case 'u':
		forceuser = EARGF(usage());
		break;
	default:
		usage();
		break;
	}ARGEND;
	if(argc == 0)
		usage();

	/*
	 * sanity checks -- I've tuned these to stupid
	 * values in the past.
	 */
	assert(4*Kpmax < Pivspc);
	assert(2*Msgmax < Bufspc);
	assert(Treesz < Inlmax);
	initfs(cachesz);
	initshow();
	fmtinstall('H', encodefmt);
	fmtinstall('B', Bconv);
	fmtinstall('M', Mconv);
	fmtinstall('P', Pconv);
	fmtinstall('K', Kconv);
	fmtinstall('R', Rconv);
	fmtinstall('F', fcallfmt);
	fmtinstall('Q', Qconv);

	if((s = getenv("NPROC")) != nil)
		nproc = atoi(s);
	if(nproc == 0)
		nproc = 2;
	if(nproc > nelem(fs->active))
		nproc = nelem(fs->active);
	if(ream){
		reamfs(argv[0]);
		exits(nil);
	}

	loadfs(argv[0]);

	fs->syncrz.l = &fs->synclk;
	fs->rdchan = mkchan(32);
	fs->wrchan = mkchan(32);
	fs->nsyncers = nproc;
	if(fs->nsyncers > fs->narena)
		fs->nsyncers = fs->narena;
	for(i = 0; i < fs->nsyncers; i++)
		fs->chsync[i] = mkchan(128);
	for(i = 0; i < fs->narena; i++)
		fs->arenas[i].sync = fs->chsync[i%nproc];
	srvfd = postfd(srvname, "");
	ctlfd = postfd(srvname, ".cmd");
	launch(runtasks, -1, nil, "tasks");
	launch(runcons, fs->nquiesce++, (void*)ctlfd, "ctl");
	launch(runwrite, fs->nquiesce++, nil, "mutate");
	for(i = 0; i < nproc; i++)
		launch(runread, fs->nquiesce++, nil, "readio");
	for(i = 0; i < fs->nsyncers; i++)
		launch(runsync, -1, fs->chsync[i], "syncio");
	if(srvfd != -1)
		launch(runfs, fs->nquiesce++, (void*)srvfd, "srvio");
	exits(nil);
}