mdctl-v0.4mdctl-v0.4

1 files changed, 133 insertions, 0 deletions

diff --git a/Build.c b/Build.c
index bcad0a6..40b631f 100644
--- a/Build.c
+++ b/Build.c
@@ -29,8 +29,141 @@
 
 #include "mdctl.h"
 
+#define REGISTER_DEV 		_IO (MD_MAJOR, 1)
+#define START_MD     		_IO (MD_MAJOR, 2)
+#define STOP_MD      		_IO (MD_MAJOR, 3)
+
 int Build(char *mddev, int mdfd, int chunk, int level,
 	  int raiddisks,
 	  int subdevs, char *subdev[])
 {
+	/* Build a linear or raid0 arrays without superblocks
+	 * We cannot really do any checks, we just do it.
+	 * For md_version < 0.90.0, we call REGISTER_DEV
+	 * with the device numbers, and then
+	 * START_MD giving the "geometry"
+	 * geometry is 0xpp00cc
+	 * where pp is personality: 1==linear, 2=raid0
+	 * cc = chunk size factor: 0==4k, 1==8k etc.
+	 *
+	 * For md_version >= 0.90.0 we call
+	 * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
+	 *
+	 */
+	int i;
+	int vers;
+	struct stat stb;
+	if (raiddisks != subdevs) {
+		fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
+			raiddisks, subdevs);
+		return 1;
+	}
+
+	/* scan all devices, make sure they really are block devices */
+	for (i=0; i<subdevs; i++) {
+		if (stat(subdev[i], &stb)) {
+			fprintf(stderr, Name ": Cannot find %s: %s\n",
+				subdev[i], strerror(errno));
+			return 1;
+		}
+		if ((stb.st_mode & S_IFMT) != S_IFBLK) {
+			fprintf(stderr, Name ": %s is not a block device.\n",
+				subdev[i]);
+			return 1;
+		}
+	}
+
+	vers = md_get_version(mdfd);
+	
+	/* looks Ok, go for it */
+	if (vers >= 90000) {
+		mdu_array_info_t array;
+		array.level = level;
+		array.size = 0;
+		array.nr_disks = raiddisks;
+		array.raid_disks = raiddisks;
+		array.md_minor = 0;
+		if (fstat(mdfd, &stb)==0)
+			array.md_minor = MINOR(stb.st_rdev);
+		array.not_persistent = 0;
+		array.state = 0; /* not clean, but no errors */
+		array.active_disks = raiddisks;
+		array.working_disks = raiddisks;
+		array.spare_disks = 0;
+		array.failed_disks = 0;
+		array.chunk_size = chunk*1024;
+		if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
+			fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
+				mddev, strerror(errno));
+			return 1;
+		}
+	}
+	/* now add the devices */
+	for (i=0; i<subdevs; i++) {
+		if (stat(subdev[i], &stb)) {
+			fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
+				subdev[i]);
+			goto abort;
+		}
+		if ((stb.st_rdev & S_IFMT)!= S_IFBLK) {
+			fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
+				subdev[i]);
+			goto abort;
+		}
+		if (vers> 90000) {
+			mdu_disk_info_t disk;
+			disk.number = i;
+			disk.raid_disk = i;
+			disk.state = 6;
+			disk.major = MAJOR(stb.st_rdev);
+			disk.minor = MINOR(stb.st_rdev);
+			if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
+				fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
+					subdev[i], strerror(errno));
+				goto abort;
+			}
+		} else {
+			if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
+				fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n",
+					subdev[i], strerror(errno));
+				goto abort;
+			}
+		}
+	}
+	/* now to start it */
+	if (vers > 90000) {
+		mdu_param_t param; /* not used by syscall */
+		if (ioctl(mdfd, RUN_ARRAY, param)) {
+			fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
+				strerror(errno));
+			goto abort;
+		}
+	} else {
+		int arg;
+		arg=0;
+		while (chunk > 4096) {
+			arg++;
+			chunk >>= 1;
+		}
+		if (level == 0)
+			chunk |= 0x20000;
+		else 	chunk |= 0x10000;
+		if (ioctl(mdfd, START_MD, arg)) {
+			fprintf(stderr, Name ": START_MD failed: %s\n",
+				strerror(errno));
+			goto abort;
+		}
+	}
+	fprintf(stderr, Name ": array %s built and started.\n",
+		mddev);
+	return 0;
+
+ abort:
+	if (vers > 900000)
+	    ioctl(mdfd, STOP_ARRAY, 0);
+	else
+	    ioctl(mdfd, STOP_MD, 0);
+	return 1;
+		
 }
+