config: allow Array line to contain array name without /dev/md/ prefix.

For consistency with --create and --assemble, allow the array name
given in mdadm.conf to exclude the "/dev/md/" prefix.  So e.g.

  ARRAY home uuid=whatever

is treated like

  ARRAY /dev/md/home uuid=whatever

Also exclude names which create_mddev will reject.

Signed-off-by: NeilBrown <neilb@suse.de>

3 files changed, 55 insertions, 8 deletions

diff --git a/Monitor.c b/Monitor.c
index 4b660e4..e43175f 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -173,7 +173,13 @@ int Monitor(mddev_dev_t devlist,
 			st = malloc(sizeof *st);
 			if (st == NULL)
 				continue;
-			st->devname = strdup(mdlist->devname);
+			if (mdlist->devname[0] == '/')
+				st->devname = strdup(mdlist->devname);
+			else {
+				st->devname = malloc(8+strlen(mdlist->devname)+1);
+				strcpy(strcpy(st->devname, "/dev/md/"),
+				       mdlist->devname);
+			}
 			st->utime = 0;
 			st->next = statelist;
 			st->err = 0;
diff --git a/config.c b/config.c
index fd757ad..41428ae 100644
--- a/config.c
+++ b/config.c
@@ -448,6 +448,17 @@ void devline(char *line)
 mddev_ident_t mddevlist = NULL;
 mddev_ident_t *mddevlp = &mddevlist;
 
+static int is_number(char *w)
+{
+	/* check if there are 1 or more digits and nothing else */
+	int digits = 0;
+	while (*w && isdigit(*w)) {
+		digits++;
+		w++;
+	}
+	return (digits && ! *w);
+}
+
 void arrayline(char *line)
 {
 	char *w;
@@ -473,11 +484,35 @@ void arrayline(char *line)
 	mis.member = NULL;
 
 	for (w=dl_next(line); w!=line; w=dl_next(w)) {
-		if (w[0] == '/' || strcasecmp(w, "<ignore>") == 0) {
-			if (mis.devname)
-				fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n",
-					mis.devname, w);
-			else mis.devname = w;
+		if (w[0] == '/' || strchr(w, '=') == NULL) {
+			/* This names the device, or is '<ignore>'.
+			 * The rules match those in create_mddev.
+			 * 'w' must be:
+			 *  /dev/md/{anything}
+			 *  /dev/mdNN
+			 *  /dev/md_dNN
+			 *  <ignore>
+			 *  or anything that doesn't start '/' or '<'
+			 */
+			if (strcasecmp(w, "<ignore>") == 0 ||
+			    strncmp(w, "/dev/md/", 8) == 0 ||
+			    (w[0] != '/' && w[0] != '<') ||
+			    (strncmp(w, "/dev/md", 7) == 0 && 
+			     is_number(w+7)) ||
+			    (strncmp(w, "/dev/md_d", 9) == 0 &&
+			     is_number(w+9))
+				) {
+				/* This is acceptable */;
+				if (mis.devname)
+					fprintf(stderr, Name ": only give one "
+						"device per ARRAY line: %s and %s\n",
+						mis.devname, w);
+				else
+					mis.devname = w;
+			}else {
+				fprintf(stderr, Name ": %s is an invalid name for "
+					"an md device - ignored.\n", w);
+			}
 		} else if (strncasecmp(w, "uuid=", 5)==0 ) {
 			if (mis.uuid_set)
 				fprintf(stderr, Name ": only specify uuid once, %s ignored.\n",
diff --git a/mdadm.conf.5 b/mdadm.conf.5
index f69c0b0..9876d27 100644
--- a/mdadm.conf.5
+++ b/mdadm.conf.5
@@ -95,14 +95,20 @@ DEVICE partitions
 The ARRAY lines identify actual arrays.  The second word on the line
 may be the name of the device where the array is normally
 assembled, such as
-.BR  /dev/md1 .
+.B /dev/md1
+or
+.BR /dev/md/backup .
+If the name does not start with a slash
+.RB (' / '),
+it is treated as being in
+.BR /dev/md/ .
 Alternately the word
 .B <ignore>
 (complete with angle brackets) can be given in which case any array
 which matches the rest of the line will never be automatically assembled.
 If no device name is given,
 .I mdadm
-will use various heuristic to determine an appropriate name.
+will use various heuristics to determine an appropriate name.
 .PP
 Subsequent words identify the array, or identify the array as a member
 of a group. If multiple identities are given,