Support 'bitmap=' in mdadm.conf for auto-assembling arrays with write-intent bitmaps in separate files.

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

Assemble.c

@@ -623,8 +623,22 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 				fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
 				return 1;
 			}
+		} else if (ident->bitmap_file) {
+			/* From config file */
+			int bmfd = open(ident->bitmap_file, O_RDWR);
+			if (bmfd < 0) {
+				fprintf(stderr, Name ": Could not open bitmap file %s\n",
+					ident->bitmap_file);
+				return 1;
+			}
+			if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
+				fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
+				close(bmfd);
+				return 1;
+			}
+			close(bmfd);
 		}
-					
+
 		/* First, add the raid disks, but add the chosen one last */
 		for (i=0; i<= bestcnt; i++) {
 			int j;

ChangeLog

@@ -14,6 +14,8 @@ Changes Prior to 2.4 release
     -   Handle symlinks in /dev better
     -   Fix mess in --detail output which a device is missing.
     -   Manpage tidyup
+    -   Support 'bitmap=' in mdadm.conf for auto-assembling arrays with
+	write-intent bitmaps in separate files.
 
 Changes Prior to 2.3.1 release
     -   Fixed -O2 compile so I could make and RPM.

config.c

@@ -281,6 +281,7 @@ void arrayline(char *line)
 	mis.next = NULL;
 	mis.st = NULL;
 	mis.bitmap_fd = -1;
+	mis.bitmap_file = NULL;
 	mis.name[0] = 0;
 
 	for (w=dl_next(line); w!=line; w=dl_next(w)) {
@@ -321,6 +322,13 @@ void arrayline(char *line)
 			else
 				strcpy(mis.name, w+5);
 
+		} else if (strncasecmp(w, "bitmap=", 7) == 0) {
+			if (mis.bitmap_file)
+				fprintf(stderr, Name ": only specify bitmap file once. %s ignored\n",
+					w);
+			else
+				mis.bitmap_file = w+7;
+
 		} else if (strncasecmp(w, "devices=", 8 ) == 0 ) {
 			if (mis.devices)
 				fprintf(stderr, Name ": only specify devices once (use a comma separated list). %s ignored\n",

mdadm.c

@@ -112,6 +112,7 @@ int main(int argc, char *argv[])
 	ident.autof = 0;
 	ident.st = NULL;
 	ident.bitmap_fd = -1;
+	ident.bitmap_file = NULL;
 	ident.name[0] = 0;
 
 	while ((option_index = -1) ,

mdadm.conf.5

@@ -151,6 +151,18 @@ also have a number appended to indicate how many partitions to create
 device files for, e.g.
 .BR auto=mdp5 .
 The default is 4.
+
+.TP
+.B bitmap=
+The option specifies a file in which a write-intent bitmap should be
+found.  When assembling the array,
+.I mdadm
+will provide this file to the
+.B md
+driver as the bitmap file.  This has the same function as the
+.B --bitmap-file
+option to
+.BR --assemble .
 .RE
 
 .TP

mdadm.h

@@ -147,6 +147,7 @@ typedef struct mddev_ident_s {
 	struct supertype *st;
 	int	autof;		/* 1 for normal, 2 for partitioned */
 	char	*spare_group;
+	char	*bitmap_file;
 	int	bitmap_fd;
 
 	struct mddev_ident_s *next;