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[Patch v2] block: revert block_dev read-only check

From:  Chuck Ebbert <cebbert-AT-redhat.com>
To:  Linus Torvalds <torvalds-AT-linux-foundation.org>
Subject:  [Patch v2] block: revert block_dev read-only check
Date:  Wed, 16 Feb 2011 18:11:53 -0500
Message-ID:  <20110216181153.5b8f81d5@katamari>
Cc:  linux-kernel-AT-vger.kernel.org, Tejun Heo <tj-AT-kernel.org>, Milan Broz <mbroz-AT-redhat.com>
Archive-link:  Article

This reverts commit 75f1dc0d076d1c1168f2115f1941ea627d38bd5a
("block: check bdev_read_only() from blkdev_get()"). That commit added
stricter checking to make sure devices that were being used read-only
were actually opened in that mode.

It turns out that the change breaks a bunch of kernel code that opens
block devices. Affected systems include dm, md, and the loop device.
Because strict checking for read-only opens of block devices was not
done before this, the code that opens the devices was opening them
read-write even if they were being used read-only. Auditing all that
code will take time, and new userspace packages for dm, mdadm, etc.
will also be required.

Signed-off-by: Chuck Ebbert <cebbert@redhat.com>

--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1215,12 +1215,6 @@ int blkdev_get(struct block_device *bdev
 
 	res = __blkdev_get(bdev, mode, 0);
 
-	/* __blkdev_get() may alter read only status, check it afterwards */
-	if (!res && (mode & FMODE_WRITE) && bdev_read_only(bdev)) {
-		__blkdev_put(bdev, mode, 0);
-		res = -EACCES;
-	}
-
 	if (whole) {
 		/* finish claiming */
 		mutex_lock(&bdev->bd_mutex);
@@ -1298,6 +1292,11 @@ struct block_device *blkdev_get_by_path(
 	if (err)
 		return ERR_PTR(err);
 
+	if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) {
+		blkdev_put(bdev, mode);
+		return ERR_PTR(-EACCES);
+	}
+
 	return bdev;
 }
 EXPORT_SYMBOL(blkdev_get_by_path);


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