linux-kernel - [42/55] Revert "block: rescan partitions on invalidated devices on -ENOMEDIA

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Message-Id: <20110806000253.083070807@clark.kroah.org>
Date:	Fri, 05 Aug 2011 17:02:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Tejun Heo <tj@...nel.org>, David Zeuthen <zeuthen@...il.com>,
	Martin Pitt <martin.pitt@...ntu.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Jens Axboe <jaxboe@...ionio.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: [42/55] Revert "block: rescan partitions on invalidated devices on -ENOMEDIA

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------
 too"

This reverts commit 5b2745db12a3f97a9ec9efd4ffa077da707d3e4c (commit
02e352287a40bd456eb78df705bf888bc3161d3f upstream)

This should have only been commited on .38 and newer, not older kernels
like this one, sorry.

Cc: Tejun Heo <tj@...nel.org>
Cc: David Zeuthen <zeuthen@...il.com>
Cc: Martin Pitt <martin.pitt@...ntu.com>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Jens Axboe <jaxboe@...ionio.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/block_dev.c |   27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1203,7 +1203,6 @@ static int __blkdev_get(struct block_dev
 			if (!bdev->bd_part)
 				goto out_clear;
 
-			ret = 0;
 			if (disk->fops->open) {
 				ret = disk->fops->open(bdev, mode);
 				if (ret == -ERESTARTSYS) {
@@ -1219,18 +1218,9 @@ static int __blkdev_get(struct block_dev
 					mutex_unlock(&bdev->bd_mutex);
 					goto restart;
 				}
+				if (ret)
+					goto out_clear;
 			}
-			/*
-			 * If the device is invalidated, rescan partition
-			 * if open succeeded or failed with -ENOMEDIUM.
-			 * The latter is necessary to prevent ghost
-			 * partitions on a removed medium.
-			 */
-			if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
-				rescan_partitions(disk, bdev);
-			if (ret)
-				goto out_clear;
-
 			if (!bdev->bd_openers) {
 				bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
 				bdi = blk_get_backing_dev_info(bdev);
@@ -1238,6 +1228,8 @@ static int __blkdev_get(struct block_dev
 					bdi = &default_backing_dev_info;
 				bdev->bd_inode->i_data.backing_dev_info = bdi;
 			}
+			if (bdev->bd_invalidated)
+				rescan_partitions(disk, bdev);
 		} else {
 			struct block_device *whole;
 			whole = bdget_disk(disk, 0);
@@ -1264,14 +1256,13 @@ static int __blkdev_get(struct block_dev
 		put_disk(disk);
 		disk = NULL;
 		if (bdev->bd_contains == bdev) {
-			ret = 0;
-			if (bdev->bd_disk->fops->open)
+			if (bdev->bd_disk->fops->open) {
 				ret = bdev->bd_disk->fops->open(bdev, mode);
-			/* the same as first opener case, read comment there */
-			if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
+				if (ret)
+					goto out_unlock_bdev;
+			}
+			if (bdev->bd_invalidated)
 				rescan_partitions(bdev->bd_disk, bdev);
-			if (ret)
-				goto out_unlock_bdev;
 		}
 	}
 	bdev->bd_openers++;


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