From: Al Viro <al@aretha.pdmi.ras.ru>
Date: Fri, 19 Sep 2008 07:08:13 +0000 (-0400)
Subject: [PATCH] get rid of struct file use in blkdev_ioctl() BLKBSZSET
X-Git-Tag: v2.6.28-rc1~23^2~1
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=commitdiff_plain;h=6af3a56e1dd4d95836a47214e5c60d5b749a5501

[PATCH] get rid of struct file use in blkdev_ioctl() BLKBSZSET

We need to do bd_claim() only if file hadn't been opened with O_EXCL
and then we have no need to use file itself as owner.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/block/ioctl.c b/block/ioctl.c
index bd214cb37f2..14b7f2c1066 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -343,10 +343,11 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
 			return -EINVAL;
 		if (get_user(n, (int __user *) arg))
 			return -EFAULT;
-		if (bd_claim(bdev, file) < 0)
+		if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
 			return -EBUSY;
 		ret = set_blocksize(bdev, n);
-		bd_release(bdev);
+		if (!(mode & FMODE_EXCL))
+			bd_release(bdev);
 		return ret;
 	case BLKPG:
 		lock_kernel();