linux-kernel - [Patch v2] block: revert block

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

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@...hat.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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