X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=block%2Fgenhd.c;h=4cd3433c99ac7d64fe05b72a1061cba01059920a;hb=0217eae3a825d551b99991bc30555c3daeb0a4df;hp=eedab5b4685b4cfd9a6f9724294738f21dc6d112;hpb=689d6fac40b41c7bf154f362deaf442548e4dc81;p=safe%2Fjmp%2Flinux-2.6

diff --git a/block/genhd.c b/block/genhd.c
index eedab5b..4cd3433 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -478,14 +478,37 @@ static int exact_lock(dev_t devt, void *data)
  *
  * This function registers the partitioning information in @disk
  * with the kernel.
+ *
+ * FIXME: error handling
  */
 void add_disk(struct gendisk *disk)
 {
 	struct backing_dev_info *bdi;
+	dev_t devt;
 	int retval;
 
+	/* minors == 0 indicates to use ext devt from part0 and should
+	 * be accompanied with EXT_DEVT flag.  Make sure all
+	 * parameters make sense.
+	 */
+	WARN_ON(disk->minors && !(disk->major || disk->first_minor));
+	WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT));
+
 	disk->flags |= GENHD_FL_UP;
-	disk_to_dev(disk)->devt = MKDEV(disk->major, disk->first_minor);
+
+	retval = blk_alloc_devt(&disk->part0, &devt);
+	if (retval) {
+		WARN_ON(1);
+		return;
+	}
+	disk_to_dev(disk)->devt = devt;
+
+	/* ->major and ->first_minor aren't supposed to be
+	 * dereferenced from here on, but set them just in case.
+	 */
+	disk->major = MAJOR(devt);
+	disk->first_minor = MINOR(devt);
+
 	blk_register_region(disk_devt(disk), disk->minors, NULL,
 			    exact_match, exact_lock, disk);
 	register_disk(disk);
@@ -555,13 +578,13 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
  * RETURNS:
  * Resulting block_device on success, NULL on failure.
  */
-extern struct block_device *bdget_disk(struct gendisk *disk, int partno)
+struct block_device *bdget_disk(struct gendisk *disk, int partno)
 {
 	struct hd_struct *part;
 	struct block_device *bdev = NULL;
 
 	part = disk_get_part(disk, partno);
-	if (part && (part->nr_sects || partno == 0))
+	if (part)
 		bdev = bdget(part_devt(part));
 	disk_put_part(part);
 
@@ -631,7 +654,7 @@ static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos)
 	struct class_dev_iter *iter;
 	struct device *dev;
 
-	iter = kmalloc(GFP_KERNEL, sizeof(*iter));
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 	if (!iter)
 		return ERR_PTR(-ENOMEM);
 
@@ -674,7 +697,7 @@ static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
 	static void *p;
 
 	p = disk_seqf_start(seqf, pos);
-	if (!IS_ERR(p) && p)
+	if (!IS_ERR(p) && p && !*pos)
 		seq_puts(seqf, "major minor  #blocks  name\n\n");
 	return p;
 }
@@ -794,6 +817,11 @@ static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
 static struct device_attribute dev_attr_fail =
 	__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
 #endif
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+static struct device_attribute dev_attr_fail_timeout =
+	__ATTR(io-timeout-fail,  S_IRUGO|S_IWUSR, part_timeout_show,
+		part_timeout_store);
+#endif
 
 static struct attribute *disk_attrs[] = {
 	&dev_attr_range.attr,
@@ -806,6 +834,9 @@ static struct attribute *disk_attrs[] = {
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 	&dev_attr_fail.attr,
 #endif
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+	&dev_attr_fail_timeout.attr,
+#endif
 	NULL
 };
 
@@ -1008,7 +1039,7 @@ dev_t blk_lookup_devt(const char *name, int partno)
 			continue;
 
 		part = disk_get_part(disk, partno);
-		if (part && (part->nr_sects || partno == 0)) {
+		if (part) {
 			devt = part_devt(part);
 			disk_put_part(part);
 			break;