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cwfs: noatime flag

--- a/sys/src/cmd/cwfs/all.h

+++ b/sys/src/cmd/cwfs/all.h

@@ -84,6 +84,7 @@

 ulong	authdebugflag;

 int	noattach;		/* attach is disabled */

 int	noauth;			/* auth is disable */

+int	noatime;		/* atime is disabled */

 int	wstatallow;		/* set to circumvent wstat permissions */

 int	writeallow;		/* set to circumvent write permissions */

 int	duallow;		/* single user to allow du */

--- a/sys/src/cmd/cwfs/con.c

+++ b/sys/src/cmd/cwfs/con.c

@@ -690,10 +690,17 @@

 cmd_noauth(int, char *[])

 {

 	noauth = !noauth;

-	print("authentication %s\n", noauth ? "disabled" : "enabled");

+	print("auth %s\n", noauth ? "disabled" : "enabled");

 }

 void

+cmd_noatime(int, char *[])

+{

+	noatime = !noatime;

+	print("atime %s\n", noatime ? "disabled" : "enabled");

+}

+

+void

 cmd_noattach(int, char *[])

 {

 	noattach = !noattach;

@@ -767,6 +774,7 @@

 	cmd_install("hangup", "chan -- clunk files", cmd_hangup);

 	cmd_install("printconf", "-- print configuration", cmd_printconf);

 	cmd_install("noauth", "toggle noauth flag", cmd_noauth);

+	cmd_install("noatime", "toggle noatime flag", cmd_noatime);

 	cmd_install("noattach", "toggle noattach flag", cmd_noattach);

 	cmd_install("files", "report on files structure", cmd_files);

--- a/sys/src/cmd/cwfs/config.c

+++ b/sys/src/cmd/cwfs/config.c

@@ -22,6 +22,7 @@

 static char *src, *dest;

 static int noauthset = 0;

+static int noatimeset = 0;

 static int readonlyset = 0;

 static int resetparams;

@@ -432,6 +433,8 @@

 	if(!noauthset)

 		noauth = 0;

+	if(!noatimeset)

+		noatime = 0;

 	if(!readonlyset)

 		readonly = 0;

 	for (cp = p->iobuf; *cp != '\0'; cp++) {

@@ -448,6 +451,9 @@

 		} else if(strcmp(word, "noauth") == 0){

 			if(!noauthset)

 				noauth = 1;

+		} else if(strcmp(word, "noatime") == 0){

+			if(!noatimeset)

+				noatime = 1;

 		} else if(strcmp(word, "readonly") == 0){

 			if(!readonlyset)

 				readonly = 1;

@@ -595,6 +601,8 @@

 					fs->conf);

 		if(noauth)

 			cp = seprint(cp, ep, "noauth\n");

+		if(noatime)

+			cp = seprint(cp, ep, "noatime\n");

 		if(readonly)

 			cp = seprint(cp, ep, "readonly\n");

 		if(conf.newcache)

@@ -605,7 +613,7 @@

 		putbuf(p);

 		f.modconf = f.newconf = 0;

-		noauthset = readonlyset = 0;

+		noauthset = noatimeset = readonlyset = 0;

 		goto start;

 	}

 	putbuf(p);

@@ -993,19 +1001,26 @@

 		}

 		if(strcmp(word, "noattach") == 0) {

 			noattach = !noattach;

-			print("attach is now %s\n", noattach ? "disallowed" : "allowed");

+			print("attach %s\n", noattach ? "disallowed" : "allowed");

 			continue;

 		}

 		if(strcmp(word, "noauth") == 0) {

 			noauth = !noauth;

-			print("auth is now %s\n", noauth ? "disabled" : "enabled");

+			print("auth %s\n", noauth ? "disabled" : "enabled");

 			noauthset++;

 			f.modconf = 1;

 			continue;

 		}

+		if(strcmp(word, "noatime") == 0) {

+			noatime = !noatime;

+			print("atime %s\n", noatime ? "disabled" : "enabled");

+			noatimeset++;

+			f.modconf = 1;

+			continue;

+		}

 		if(strcmp(word, "readonly") == 0) {

 			readonly = !readonly;

-			print("filesystem is now %s\n", readonly ? "readonly" : "writable");

+			print("filesystem %s\n", readonly ? "readonly" : "writable");

 			readonlyset++;

 			f.modconf = 1;

 			continue;

--- a/sys/src/cmd/cwfs/dentry.c

+++ b/sys/src/cmd/cwfs/dentry.c

@@ -13,16 +13,18 @@

 {

 	Timet t;

-	if(p && p->dev->type != Devro) {

-		p->flags |= Bmod;

-		t = time(nil);

-		if(f & (FREAD|FWRITE))

-			d->atime = t;

-		if(f & FWRITE) {

-			d->mtime = t;

-			d->muid = uid;

-			d->qid.version++;

-		}

+	if(p == nil || p->dev->type == Devro)

+		return;

+	f &= FREAD|FWRITE;

+	if(f != FWRITE && noatime)

+		return;

+	p->flags |= Bmod;

+	t = time(nil);

+	d->atime = t;

+	if(f & FWRITE){

+		d->mtime = t;

+		d->muid = uid;

+		d->qid.version++;

 	}

 }