Revert "md: improve partition detection in md array"
This reverts commit 5b479c91da90eef605f851508744bfe8269591a0.
Quoth Neil Brown:
"It causes an oops when auto-detecting raid arrays, and it doesn't
seem easy to fix.
The array may not be 'open' when do_md_run is called, so
bdev->bd_disk might be NULL, so bd_set_size can oops.
This whole approach of opening an md device before it has been
assembled just seems to get more and more painful. I think I'm going
to have to come up with something clever to provide both backward
comparability with usage expectation, and sane integration into the
rest of the kernel."
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2901d0c..65814b0 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3104,7 +3104,6 @@
struct gendisk *disk;
struct mdk_personality *pers;
char b[BDEVNAME_SIZE];
- struct block_device *bdev;
if (list_empty(&mddev->disks))
/* cannot run an array with no devices.. */
@@ -3332,13 +3331,7 @@
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
- bdev = bdget_disk(mddev->gendisk, 0);
- if (bdev) {
- bd_set_size(bdev, mddev->array_size << 1);
- blkdev_ioctl(bdev->bd_inode, NULL, BLKRRPART, 0);
- bdput(bdev);
- }
-
+ mddev->changed = 1;
md_new_event(mddev);
kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
return 0;
@@ -3460,6 +3453,7 @@
mddev->pers = NULL;
set_capacity(disk, 0);
+ mddev->changed = 1;
if (mddev->ro)
mddev->ro = 0;
@@ -4599,6 +4593,20 @@
return 0;
}
+static int md_media_changed(struct gendisk *disk)
+{
+ mddev_t *mddev = disk->private_data;
+
+ return mddev->changed;
+}
+
+static int md_revalidate(struct gendisk *disk)
+{
+ mddev_t *mddev = disk->private_data;
+
+ mddev->changed = 0;
+ return 0;
+}
static struct block_device_operations md_fops =
{
.owner = THIS_MODULE,
@@ -4606,6 +4614,8 @@
.release = md_release,
.ioctl = md_ioctl,
.getgeo = md_getgeo,
+ .media_changed = md_media_changed,
+ .revalidate_disk= md_revalidate,
};
static int md_thread(void * arg)