From 6997f77706a8c518a9c9cd84e1291b93f2065cc4 Mon Sep 17 00:00:00 2001
From: Kenneth R Westerback <krw@cvs.openbsd.org>
Date: Tue, 26 Jan 2016 02:38:06 +0000
Subject: Simplify logic of read_partition_map(), junking retries with various
 sizes of logical block. Rely on read_dpme() to do the correct thing.

---
 sbin/pdisk/partition_map.c | 83 +++++++++++++++-------------------------------
 1 file changed, 27 insertions(+), 56 deletions(-)

(limited to 'sbin/pdisk')

diff --git a/sbin/pdisk/partition_map.c b/sbin/pdisk/partition_map.c
index dd75ec753e8..b79e7ce2941 100644
--- a/sbin/pdisk/partition_map.c
+++ b/sbin/pdisk/partition_map.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: partition_map.c,v 1.64 2016/01/25 23:43:20 krw Exp $	*/
+/*	$OpenBSD: partition_map.c,v 1.65 2016/01/26 02:38:05 krw Exp $	*/
 
 /*
  * partition_map.c - partition map routines
@@ -108,7 +108,7 @@ open_partition_map(int fd, char *name, uint64_t mediasz, uint32_t sectorsz)
 		return NULL;
 	}
 
-	if (read_partition_map(map) != -1)
+	if (read_partition_map(map) == 0)
 		return map;
 
 	if (!lflag) {
@@ -149,69 +149,40 @@ int
 read_partition_map(struct partition_map_header *map)
 {
 	struct dpme *dpme;
-	double d;
-	int ix, old_logical;
+	int ix;
 	uint32_t limit;
 
-	dpme = malloc(sizeof(struct dpme));
-	if (dpme == NULL) {
-		warn("can't allocate memory for disk buffers");
-		return -1;
-	}
-	if (read_dpme(map->fd, 1, dpme) == 0) {
-		warnx("Can't read block 1 from '%s'", map->name);
-		free(dpme);
-		return -1;
-	} else if (dpme->dpme_signature != DPME_SIGNATURE) {
-		old_logical = map->logical_block;
-		map->logical_block = 512;
-		while (map->logical_block <= map->physical_block) {
-			if (read_dpme(map->fd, 1, dpme) == 0) {
-				warnx("Can't read block 1 from '%s'",
-				    map->name);
-				free(dpme);
-				return -1;
-			} else if (dpme->dpme_signature == DPME_SIGNATURE) {
-				d = map->media_size;
-				map->media_size = (d * old_logical) /
-				    map->logical_block;
-				break;
-			}
-			map->logical_block *= 2;
-		}
-		if (map->logical_block > map->physical_block) {
-			warnx("No valid block 1 on '%s'", map->name);
-			free(dpme);
-			return -1;
-		}
-	}
-	limit = dpme->dpme_map_entries;
-	ix = 1;
-	while (1) {
-		if (add_data_to_map(dpme, ix, map) == 0) {
-			free(dpme);
-			return -1;
-		}
-		if (ix >= limit) {
-			break;
-		} else {
-			ix++;
-		}
-
+	limit = 1; /* There has to be at least one, which has actual value. */
+	for (ix = 1; ix <= limit; ix++) {
 		dpme = malloc(sizeof(struct dpme));
 		if (dpme == NULL) {
-			warn("can't allocate memory for disk buffers");
-			return -1;
+			warn("can't allocate memory for partition entry");
+			return 1;
 		}
 		if (read_dpme(map->fd, ix, dpme) == 0) {
 			warnx("Can't read block %u from '%s'", ix, map->name);
 			free(dpme);
-			return -1;
-		} else if ((dpme->dpme_signature != DPME_SIGNATURE) ||
-			   (dpme->dpme_map_entries != limit)) {
-			warnx("Bad dpme in block %u from '%s'", ix, map->name);
+			return 1;
+		}
+		if (dpme->dpme_signature != DPME_SIGNATURE) {
+			warnx("Invalid signature on block %d. Expected %x, "
+			    "got %x", ix, DPME_SIGNATURE,
+			    dpme->dpme_signature);
+			free(dpme);
+			return 1;
+		}
+		if (ix == 1)
+			limit = dpme->dpme_map_entries;
+		if (limit != dpme->dpme_map_entries) {
+			warnx("Invalid entry count on block %d. "
+			    "Expected %d, got %d", ix, limit,
+			    dpme->dpme_map_entries);
+			free(dpme);
+			return 1;
+		}
+		if (add_data_to_map(dpme, ix, map) == 0) {
 			free(dpme);
-			return -1;
+			return 1;
 		}
 	}
 	return 0;
-- 
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