1993/0501/port/devroot.c (diff list | history)

port/devroot.c on 1990/0227
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		#include "devtab.h"
1993/0501		enum {
1990/0227		Qdir, Qbin, Qdev, Qenv, Qproc,
1992/0213		Qnet,
1993/0501		Qrecover,
1991/1206		Qboot, Qcfs,
1992/0902		Qfs,
1990/0227		};
1991/0214		extern long cfslen;
1991/0216		extern ulong cfscode[];
1992/0902		extern long fslen; extern ulong fscode[];
1991/1206		extern ulong bootlen;
1992/0902		extern uchar bootcode[];
1991/0214
1990/0227		Dirtab rootdir[]={
1991/1112		"bin", {Qbin|CHDIR}, 0, 0777, "boot", {Qboot}, 0, 0777, "dev", {Qdev|CHDIR}, 0, 0777, "env", {Qenv|CHDIR}, 0, 0777, "proc", {Qproc|CHDIR}, 0, 0777,
1992/0213		"net", {Qnet|CHDIR}, 0, 0777,
1993/0501		"recover", {Qrecover}, 0, 0777,
1990/0227		}; #define NROOT (sizeof rootdir/sizeof(Dirtab))
1991/0615		Dirtab rootpdir[]={
1991/1112		"cfs", {Qcfs}, 0, 0777,
1992/0902		"fs", {Qfs}, 0, 0777,
1991/0615		}; Dirtab *rootmap[sizeof rootpdir/sizeof(Dirtab)];
1991/0214		int nroot;
1990/0227
1993/0501		typedef struct Recover Recover; struct Recover { int len; char *req; Recover *next; }; struct { Lock; QLock; Rendez; Recover *q; }reclist;
1991/0615		int rootgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp) {
1992/0711		USED(ntab);
1992/0225		if(i >= nroot)
1991/0615		return -1;
1992/0225
1991/0615		if(i < NROOT)
1992/0225		tab = &rootdir[i];
1991/0615		else tab = rootmap[i - NROOT];
1992/0225
1991/1109		devdir(c, tab->qid, tab->name, tab->length, eve, tab->perm, dp);
1991/0615		return 1; }
1990/0227		void rootreset(void) {
1991/0615		int i; i = 0; if(cfslen) rootmap[i++] = &rootpdir[0];
1992/0902		if(fslen)
1991/0913		rootmap[i++] = &rootpdir[1];
1991/0615		nroot = NROOT + i;
1990/0227		} void rootinit(void) { } Chan* rootattach(char *spec) { return devattach('/', spec); } Chan* rootclone(Chan *c, Chan *nc) { return devclone(c, nc); } int 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;
1991/0615		return devwalk(c, name, rootdir, nroot, rootgen);
1990/0227		} void rootstat(Chan *c, char *dp) {
1991/0615		devstat(c, dp, rootdir, nroot, rootgen);
1990/0227		} Chan* rootopen(Chan *c, int omode) {
1993/0501		switch(c->qid.path & ~CHDIR) { default: break; case Qrecover: if(strcmp(up->user, eve) != 0) error(Eperm); break; }
1991/0615		return devopen(c, omode, rootdir, nroot, rootgen);
1990/0227		} void rootcreate(Chan *c, char *name, int omode, ulong perm) {
1991/1115		USED(c, name, omode, perm);
1990/11211		error(Eperm);
1990/0227		} /* * sysremove() knows this is a nop */ void rootclose(Chan *c) {
1991/1115		USED(c);
1990/0227		}
1993/0501		int rdrdy(void *a) { USED(a); return reclist.q != 0; }
1990/0227		long
1991/0411		rootread(Chan *c, void *buf, long n, ulong offset)
1990/0227		{
1993/0501		Recover *r;
1990/0227
1990/11211		switch(c->qid.path & ~CHDIR){
1990/0227		case Qdir:
1991/0615		return devdirread(c, buf, n, rootdir, nroot, rootgen);
1990/0227		case Qboot: /* boot */
1991/1206		if(offset >= bootlen)
1990/0227		return 0;
1991/1206		if(offset+n > bootlen) n = bootlen - offset;
1992/0902		memmove(buf, bootcode+offset, n);
1991/0214		return n;
1991/0312		case Qcfs: /* cfs */
1991/0411		if(offset >= cfslen)
1991/0214		return 0;
1991/0411		if(offset+n > cfslen) n = cfslen - offset; memmove(buf, ((char*)cfscode)+offset, n);
1991/0910		return n;
1992/0902		case Qfs: /* fs */ if(offset >= fslen)
1991/0910		return 0;
1992/0902		if(offset+n > fslen) n = fslen - offset; memmove(buf, ((char*)fscode)+offset, n);
1990/0227		return n;
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;
1990/0227		case Qdev: return 0; } return 0; } long
1991/0411		rootwrite(Chan *c, void *buf, long n, ulong offset)
1990/0227		{
1993/0501		char tmp[256]; USED(offset); 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;
1990/0227		} void rootremove(Chan *c) {
1991/1115		USED(c);
1990/11211		error(Eperm);
1990/0227		} void rootwstat(Chan *c, char *dp) {
1991/1115		USED(c, dp);
1990/11211		error(Eperm);
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		}