Mdassemble improvements

From: Luca Berra <bluca@comedia.it>

- Fix a bug where mdassemble didn't close a filedescriptor and so couldn't assembele
  stacked arrays.
- Allow mdassemble, when run a second time, to mark all arrays as writable.
  This is useful if they are started read-only as is best at boot-time.

ChangeLog

@@ -4,6 +4,10 @@ Changes Prior to this release
     -   Reduce maximum bitmap usage when working with bitmap files,
 	so that a only single-page allocations are made, even on
 	64bit hosts with 4K pages.
+    -   Close stray fd in mdassemble so that it can assemble stacked
+	devices
+    -   If mdassemble finds an array already assembled, it marks it
+        read-write.
 
 Changes Prior to 2.5.4 release
     -   When creating devices in /dev/md/ create matching symlinks

Makefile

@@ -76,7 +76,7 @@ SRCS =  mdadm.c config.c mdstat.c  ReadMe.c util.c Manage.c Assemble.c Build.c \
 STATICSRC = pwgr.c
 STATICOBJS = pwgr.o
 
-ASSEMBLE_SRCS := mdassemble.c Assemble.c config.c dlink.c util.c super0.c super1.c sha1.c
+ASSEMBLE_SRCS := mdassemble.c Assemble.c Manage.c config.c dlink.c util.c super0.c super1.c sha1.c
 ASSEMBLE_FLAGS:= $(CFLAGS) -DMDASSEMBLE
 ifdef MDASSEMBLE_AUTO
 ASSEMBLE_SRCS += mdopen.c mdstat.c

Manage.c

@@ -72,6 +72,8 @@ int Manage_ro(char *devname, int fd, int readonly)
 	return 0;			
 }
 
+#ifndef MDASSEMBLE
+
 int Manage_runstop(char *devname, int fd, int runstop, int quiet)
 {
 	/* Run or stop the array. array must already be configured
@@ -394,3 +396,4 @@ int Manage_subdevs(char *devname, int fd,
 	return 0;
 	
 }
+#endif

mdassemble.8

@@ -25,6 +25,13 @@ Invoking
 .B mdassemble
 has the same effect as invoking
 .B mdadm --assemble --scan.
+.PP
+Invoking
+.B mdassemble
+a second time will make all defined arrays readwrite, this is useful if
+using the
+.B start_ro
+module parameter.
 
 .SH OPTIONS
 
@@ -54,6 +61,5 @@ define.
 .PP
 .BR mdadm (8),
 .BR mdadm.conf (5),
-.BR md (4).
+.BR md (4),
-.PP
 .BR diet (1).

mdassemble.c

@@ -91,13 +91,14 @@ int main(int argc, char *argv[]) {
 				rv |= 1;
 				continue;
 			}
-			if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0)
+			if (ioctl(mdfd, GET_ARRAY_INFO, &array) < 0) {
-				/* already assembled, skip */
-				continue;
 				rv |= Assemble(array_list->st, array_list->devname, mdfd,
-					   array_list,
+					   array_list, NULL, NULL,
-					   NULL, NULL,
 					   readonly, runstop, NULL, NULL, verbose, force);
+			} else {
+				rv |= Manage_ro(array_list->devname, mdfd, -1); /* make it readwrite */
+			}
+			close(mdfd);
 		}
 	return rv;
 }

util.c

@@ -241,6 +241,7 @@ int same_uuid(int a[4], int b[4], int swapuuid)
 	}
 }
 
+#ifndef MDASSEMBLE
 int check_ext2(int fd, char *name)
 {
 	/*
@@ -338,6 +339,7 @@ int ask(char *mesg)
 	fprintf(stderr, Name ": assuming 'no'\n");
 	return 0;
 }
+#endif /* MDASSEMBLE */
 
 char *map_num(mapping_t *map, int num)
 {
@@ -534,6 +536,7 @@ unsigned long calc_csum(void *super, int bytes)
 	return csum;
 }
 
+#ifndef MDASSEMBLE
 char *human_size(long long bytes)
 {
 	static char buf[30];
@@ -586,7 +589,9 @@ char *human_size_brief(long long bytes)
 			);
 	return buf;
 }
+#endif
 
+#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 int get_mdp_major(void)
 {
 static int mdp_major = -1;
@@ -670,6 +675,7 @@ void put_md_name(char *name)
 	if (strncmp(name, "/dev/.tmp.md", 12)==0)
 		unlink(name);
 }
+#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
 
 int dev_open(char *dev, int flags)
 {