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walk: add D and T fmt characters (fileserver device/type)

--- a/sys/man/1/walk

+++ b/sys/man/1/walk

@@ -89,6 +89,12 @@

 .TP

 .B x

 permissions

+.TP

+.B D

+server device

+.TP

+.B T

+server type (kernel device rune)

 .PD

 .PP

 The default statfmt is simply,

--- a/sys/src/cmd/walk.c

+++ b/sys/src/cmd/walk.c

@@ -71,6 +71,10 @@

 		case 'q': Bprint(bout, "%ullx.%uld.%.2uhhx", f->qid.path, f->qid.vers, f->qid.type); break;

 		case 's': Bprint(bout, "%lld", f->length); break;

 		case 'x': Bprint(bout, "%ulo", f->mode); break;

+

+		/* These two  are slightly different, as they tell us about the fileserver instead of the file */

+		case 'D': Bprint(bout, "%ud", f->dev); break;

+		case 'T': Bprint(bout, "%C", f->type); break;

 		default:

 			abort();

 		}

@@ -238,7 +242,7 @@

 		if((stfmt = s_reset(stfmt)) == nil)

 			sysfatal("s_reset: %r");

 		s_append(stfmt, EARGF(usage()));

-		i = strspn(s_to_c(stfmt), "UGMamnpqsx");

+		i = strspn(s_to_c(stfmt), "UGMamnpqsxDT");

 		if(i != s_len(stfmt))

 			sysfatal("bad stfmt: %s", s_to_c(stfmt));

 		break;