IMSM: Add warning message when assemble spanned container

Due to several changes in code assemble with disks
spanned between different controllers can be obtained
in some cases. After IMSM container will be assembled, check HBA of
disks, and print proper warning if mismatch is detected.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

Assemble.c

@@ -1001,6 +1001,22 @@ static int start_array(int mdfd,
 					content->array.raid_disks);
 			fprintf(stderr, "\n");
 		}
+
+		if (st->ss->validate_container) {
+			struct mdinfo *devices_list;
+			struct mdinfo *info_devices = xmalloc(sizeof(struct mdinfo)*(okcnt+sparecnt));
+			unsigned int count;
+			devices_list = NULL;
+			for (count = 0; count < okcnt+sparecnt; count++) {
+				info_devices[count] = devices[count].i;
+				info_devices[count].next = devices_list;
+				devices_list = &info_devices[count];
+			}
+			if (st->ss->validate_container(devices_list))
+				pr_err("Mismatch detected!\n");
+			free(info_devices);
+		}
+
 		st->ss->free_super(st);
 		sysfs_uevent(content, "change");
 		if (err_ok && okcnt < (unsigned)content->array.raid_disks)

mdadm.h

@@ -960,6 +960,9 @@ extern struct superswitch {
 	/* for external backup area */
 	int (*recover_backup)(struct supertype *st, struct mdinfo *info);
 
+	/* validate container after assemble */
+	int (*validate_container)(struct mdinfo *info);
+
 	int swapuuid; /* true if uuid is bigending rather than hostendian */
 	int external;
 	const char *name; /* canonical metadata name */

platform-intel.h

@@ -204,6 +204,7 @@ struct sys_dev *find_intel_devices(void);
 const struct imsm_orom *find_imsm_capability(enum sys_dev_type hba_id);
 const struct imsm_orom *find_imsm_orom(void);
 int disk_attached_to_hba(int fd, const char *hba_path);
+int devt_attached_to_hba(dev_t dev, const char *hba_path);
 char *devt_to_devpath(dev_t dev);
 int path_attached_to_hba(const char *disk_path, const char *hba_path);
 const char *get_sys_dev_type(enum sys_dev_type);

super-intel.c

@@ -10484,6 +10484,48 @@ abort:
 
 	return ret_val;
 }
+
+/*******************************************************************************
+ * Function:	validate_container_imsm
+ * Description: This routine validates container after assemble,
+ *		eg. if devices in container are under the same controller.
+ *
+ * Parameters:
+ *	info	: linked list with info about devices used in array
+ * Returns:
+ *	1 : HBA mismatch
+ *	0 : Success
+ ******************************************************************************/
+int validate_container_imsm(struct mdinfo *info)
+{
+	if (!check_env("IMSM_NO_PLATFORM")) {
+		struct sys_dev *idev;
+		struct mdinfo *dev;
+		char *hba_path = NULL;
+		char *dev_path = devt_to_devpath(makedev(info->disk.major,
+										info->disk.minor));
+
+		for (idev = find_intel_devices(); idev; idev = idev->next) {
+			if (strstr(dev_path, idev->path)) {
+				hba_path = idev->path;
+				break;
+			}
+		}
+		free(dev_path);
+
+		if (hba_path) {
+			for (dev = info->next; dev; dev = dev->next) {
+				if (!devt_attached_to_hba(makedev(dev->disk.major,
+						dev->disk.minor), hba_path)) {
+					pr_err("WARNING - IMSM container assembled with disks under different HBAs!\n"
+						"       This operation is not supported and can lead to data loss.\n");
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
 #endif /* MDASSEMBLE */
 
 struct superswitch super_imsm = {
@@ -10527,6 +10569,7 @@ struct superswitch super_imsm = {
 	.free_super	= free_super_imsm,
 	.match_metadata_desc = match_metadata_desc_imsm,
 	.container_content = container_content_imsm,
+	.validate_container = validate_container_imsm,
 
 	.external	= 1,
 	.name = "imsm",