[PATCH] mdadm: check bitmap first when reshape raid1 to raid0

[Xiao Ni <xni@redhat.com>]

One raid1 with bitmap is composed by 4 disks. It'll fail when rashape to raid0
and lose 3 disks. It should check bitmap first when reshape raid1 to raid0.

And need to free subarray, close cfd in Grow_reshape.

Signed-off-by: Xiao Ni <xni@redhat.com>
---
 Grow.c  | 38 ++++++++++++++++++++------------------
 mdadm.c | 16 ++++++++++++----
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/Grow.c b/Grow.c
index d711884..51ed0c0 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1600,15 +1600,14 @@ int Grow_reshape(char *devname, int fd,
 			cfd = open_dev_excl(st->container_devnm);
 		} else {
 			container = st->devnm;
-			close(fd);
 			cfd = open_dev_excl(st->devnm);
 			fd = cfd;
 		}
 		if (cfd < 0) {
 			pr_err("Unable to open container for %s\n",
 				devname);
-			free(subarray);
-			return 1;
+			rv = 1;
+			goto release;
 		}
 
 		rv = st->ss->load_container(st, cfd, NULL);
@@ -1616,8 +1615,8 @@ int Grow_reshape(char *devname, int fd,
 		if (rv) {
 			pr_err("Cannot read superblock for %s\n",
 				devname);
-			free(subarray);
-			return 1;
+			rv = 1;
+			goto release;
 		}
 
 		/* check if operation is supported for metadata handler */
@@ -1641,8 +1640,8 @@ int Grow_reshape(char *devname, int fd,
 					pr_err("cannot reshape arrays in container with unsupported metadata: %s(%s)\n",
 					       devname, container);
 					sysfs_free(cc);
-					free(subarray);
-					return 1;
+					rv = 1;
+					goto release;
 				}
 			}
 			sysfs_free(cc);
@@ -1662,7 +1661,8 @@ int Grow_reshape(char *devname, int fd,
 		       s->raiddisks - array.raid_disks,
 		       s->raiddisks - array.raid_disks == 1 ? "" : "s",
 		       array.spare_disks + added_disks);
-		return 1;
+		rv = 1;
+		goto release;
 	}
 
 	sra = sysfs_read(fd, NULL, GET_LEVEL | GET_DISKS | GET_DEVS
@@ -1675,17 +1675,18 @@ int Grow_reshape(char *devname, int fd,
 	} else {
 		pr_err("failed to read sysfs parameters for %s\n",
 			devname);
-		return 1;
+		rv = 1;
+		goto release;
 	}
 	frozen = freeze(st);
 	if (frozen < -1) {
 		/* freeze() already spewed the reason */
-		sysfs_free(sra);
-		return 1;
+		rv = 1;
+		goto release;
 	} else if (frozen < 0) {
 		pr_err("%s is performing resync/recovery and cannot be reshaped\n", devname);
-		sysfs_free(sra);
-		return 1;
+		rv = 1;
+		goto release;
 	}
 
 	/* ========= set size =============== */
@@ -1901,8 +1902,6 @@ size_change_error:
 		
 		if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
 		        dprintf("Bitmap must be removed before level can be changed\n");
-		        if (cfd > -1)
-		                close(cfd);
 		        rv = 1;
 		        goto release;
 		}
@@ -1910,8 +1909,6 @@ size_change_error:
 		err = remove_disks_for_takeover(st, sra, array.layout);
 		if (err) {
 			dprintf("Array cannot be reshaped\n");
-			if (cfd > -1)
-				close(cfd);
 			rv = 1;
 			goto release;
 		}
@@ -2087,9 +2084,14 @@ size_change_error:
 		frozen = 0;
 	}
 release:
-	sysfs_free(sra);
 	if (frozen > 0)
 		unfreeze(st);
+	if (sra)
+		sysfs_free(sra);
+	if (cfd > -1)
+		close(cfd);
+	if (subarray)
+		free(subarray);
 	return rv;
 }
 
diff --git a/mdadm.c b/mdadm.c
index f56a8cf..95db2a0 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1299,7 +1299,8 @@ int main(int argc, char *argv[])
 			pr_err("'1' is an unusual number of drives for an array, so it is probably\n"
 				"     a mistake.  If you really mean it you will need to specify --force before\n"
 				"     setting the number of drives.\n");
-			exit(2);
+			rv = 2;
+			goto release;
 		}
 	}
 
@@ -1326,13 +1327,15 @@ int main(int argc, char *argv[])
 			rv = get_cluster_name(&c.homecluster);
 		if (rv) {
 			pr_err("The md can't get cluster name\n");
-			exit(1);
+			rv = 1;
+			goto release;
 		}
 	}
 
 	if (c.backup_file && data_offset != INVALID_SECTORS) {
 		pr_err("--backup-file and --data-offset are incompatible\n");
-		exit(2);
+		rv = 2;
+		goto release;
 	}
 
 	if ((mode == MISC && devmode == 'E')
@@ -1340,7 +1343,8 @@ int main(int argc, char *argv[])
 		/* Anyone may try this */;
 	else if (geteuid() != 0) {
 		pr_err("must be super-user to perform this action\n");
-		exit(1);
+		rv = 1;
+		goto release;
 	}
 
 	ident.autof = c.autof;
@@ -1640,6 +1644,10 @@ int main(int argc, char *argv[])
 		autodetect();
 		break;
 	}
+
+release:
+	if (mdfd > -1)
+		close(mdfd);
 	exit(rv);
 }
 
-- 
1.8.3.1