1997/0327/port/devroot.c (diff list | history)

1997/0327/sys/src/9/port/devroot.c:1,249 – 1997/0408/sys/src/9/port/devroot.c:1,252 (short | long | prev | next)
1990/0227		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/0227		#include "mem.h" #include "dat.h" #include "fns.h"
1992/0111		#include "../port/error.h"
1990/0227
1993/0724		enum{ Qdir= 0,
1990/0227		Qbin, Qdev, Qenv, Qproc,
1992/0213		Qnet,
1995/1114		Qnetalt,
1993/0501		Qrecover,
1993/0724		Qboot, /* readable files */
1991/1206
1993/0724		Nfiles=13, /* max root files */
1990/0227		};
1991/1206		extern ulong bootlen;
1992/0902		extern uchar bootcode[];
1991/0214
1993/0724		Dirtab rootdir[Nfiles]={ "bin", {Qbin|CHDIR}, 0, 0777, "dev", {Qdev|CHDIR}, 0, 0777, "env", {Qenv|CHDIR}, 0, 0777, "proc", {Qproc|CHDIR}, 0, 0777, "net", {Qnet|CHDIR}, 0, 0777,
1995/1114		"net.alt", {Qnetalt|CHDIR}, 0, 0777,
1993/0724		"recover", {Qrecover}, 0, 0777,
1990/0227		};
1993/0724		static uchar *rootdata[Nfiles]; static int nroot = Qboot - 1;
1993/1031		static int recovbusy;
1993/0724
1993/0501		typedef struct Recover Recover; struct Recover { int len; char *req; Recover *next; }; struct { Lock; QLock; Rendez; Recover *q; }reclist;
1993/0724		/* * add a root file */ void addrootfile(char *name, uchar *contents, ulong len)
1991/0615		{
1993/0724		Dirtab *d;
1992/0711
1993/0724		if(nroot >= Nfiles) panic("too many root files"); rootdata[nroot] = contents; d = &rootdir[nroot]; strcpy(d->name, name); d->length = len; d->perm = 0555; d->qid.path = nroot+1; nroot++;
1991/0615		}
1997/0327		static void
1990/0227		rootreset(void) {
1993/0724		addrootfile("boot", bootcode, bootlen); /* always have a boot file */
1990/0227		}
1997/0327		static Chan*
1990/0227		rootattach(char *spec) { return devattach('/', spec); }
1997/0327		static int
1990/0227		rootwalk(Chan *c, char *name) {
1991/1206		if(strcmp(name, "..") == 0) { c->qid.path = Qdir|CHDIR; return 1; }
1992/0225		if((c->qid.path & ~CHDIR) != Qdir)
1992/0226		return 0;
1993/0724		return devwalk(c, name, rootdir, nroot, devgen);
1990/0227		}
1997/0327		static void
1990/0227		rootstat(Chan *c, char *dp) {
1993/0724		devstat(c, dp, rootdir, nroot, devgen);
1990/0227		}
1997/0327		static Chan*
1990/0227		rootopen(Chan *c, int omode) {
1993/0501		switch(c->qid.path & ~CHDIR) { default: break; case Qrecover:
1993/1031		if(recovbusy) error(Einuse);
1993/0501		if(strcmp(up->user, eve) != 0) error(Eperm);
1993/1031		recovbusy = 1;
1993/0501		break; }
1993/0724		return devopen(c, omode, rootdir, nroot, devgen);
1990/0227		} /* * sysremove() knows this is a nop */
1997/0327		static void
1990/0227		rootclose(Chan *c) {
1993/1031		switch(c->qid.path) { default: break; case Qrecover: if(c->flag&COPEN) recovbusy = 0; break; }
1990/0227		}
1997/0327		static int
1995/0804		rdrdy(void*)
1993/0501		{ return reclist.q != 0; }
1997/0327		static long
1991/0411		rootread(Chan *c, void *buf, long n, ulong offset)
1990/0227		{
1993/0724		ulong t; Dirtab *d; uchar *data;
1993/0501		Recover *r;
1990/0227
1993/0724		t = c->qid.path & ~CHDIR; switch(t){
1990/0227		case Qdir:
1993/0724		return devdirread(c, buf, n, rootdir, nroot, devgen);
1993/0501		case Qrecover: qlock(&reclist); if(waserror()) { qunlock(&reclist); nexterror(); } sleep(&reclist, rdrdy, 0); lock(&reclist); r = reclist.q; reclist.q = r->next; unlock(&reclist); qunlock(&reclist); poperror(); if(n < r->len) n = r->len; memmove(buf, r->req, n); free(r->req); free(r); return n;
1993/0724		}
1993/0501
1993/0724		if(t < Qboot)
1990/0227		return 0;
1993/0724		d = &rootdir[t-1]; data = rootdata[t-1]; if(offset >= d->length) return 0; if(offset+n > d->length) n = d->length - offset; memmove(buf, data+offset, n); return n;
1990/0227		}
1997/0327		static long
1995/0804		rootwrite(Chan *c, void *buf, long n, ulong)
1990/0227		{
1993/0501		char tmp[256]; switch(c->qid.path & ~CHDIR){ default: error(Egreg); case Qrecover: if(n > sizeof(tmp)-1) error(Etoosmall); /* Nul terminate */ memmove(tmp, buf, n); tmp[n] = '\0'; mntrepl(tmp); return n; } return 0;
1995/0108		}
1997/0327		Dev rootdevtab = {
1997/0408		'/', "root",
1997/0327		rootreset, devinit, rootattach, devclone, rootwalk, rootstat, rootopen, devcreate, rootclose, rootread, devbread, rootwrite, devbwrite, devremove, devwstat, };
1993/0501		void rootrecover(Path *p, char *mntname) { int i; Recover *r; char buf[256]; r = malloc(sizeof(Recover)); i = ptpath(p, buf, sizeof(buf)); r->req = smalloc(i+strlen(mntname)+2); sprint(r->req, "%s %s", buf, mntname); lock(&reclist); r->next = reclist.q; reclist.q = r; unlock(&reclist); wakeup(&reclist);
1990/0227		}