From 2f07a88b30f510c7625d75cdf286903b465350a0 Mon Sep 17 00:00:00 2001
From: John Kacur <jkacur@redhat.com>
Date: Wed, 5 May 2010 15:15:39 +0200
Subject: [PATCH] udf: BKL ioctl pushdown

Convert udf_ioctl to an unlocked_ioctl and push the BKL down into it.

Signed-off-by: John Kacur <jkacur@redhat.com
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/udf/dir.c     |  2 +-
 fs/udf/file.c    | 43 +++++++++++++++++++++++++++----------------
 fs/udf/udfdecl.h |  3 +--
 3 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index f0f2a43..3a84455 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -209,6 +209,6 @@ static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
 const struct file_operations udf_dir_operations = {
 	.read			= generic_read_dir,
 	.readdir		= udf_readdir,
-	.ioctl			= udf_ioctl,
+	.unlocked_ioctl		= udf_ioctl,
 	.fsync			= simple_fsync,
 };
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 4b6a46c..83092fb 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -37,6 +37,7 @@
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
 #include <linux/aio.h>
+#include <linux/smp_lock.h>
 
 #include "udf_i.h"
 #include "udf_sb.h"
@@ -144,50 +145,60 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	return retval;
 }
 
-int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
-	      unsigned long arg)
+long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+	struct inode *inode = filp->f_dentry->d_inode;
 	long old_block, new_block;
 	int result = -EINVAL;
 
+	lock_kernel();
+
 	if (file_permission(filp, MAY_READ) != 0) {
-		udf_debug("no permission to access inode %lu\n",
-			  inode->i_ino);
-		return -EPERM;
+		udf_debug("no permission to access inode %lu\n", inode->i_ino);
+		result = -EPERM;
+		goto out;
 	}
 
 	if (!arg) {
 		udf_debug("invalid argument to udf_ioctl\n");
-		return -EINVAL;
+		result = -EINVAL;
+		goto out;
 	}
 
 	switch (cmd) {
 	case UDF_GETVOLIDENT:
 		if (copy_to_user((char __user *)arg,
 				 UDF_SB(inode->i_sb)->s_volume_ident, 32))
-			return -EFAULT;
+			result = -EFAULT;
 		else
-			return 0;
+			result = 0;
+		goto out;
 	case UDF_RELOCATE_BLOCKS:
-		if (!capable(CAP_SYS_ADMIN))
-			return -EACCES;
-		if (get_user(old_block, (long __user *)arg))
-			return -EFAULT;
+		if (!capable(CAP_SYS_ADMIN)) {
+			result = -EACCES;
+			goto out;
+		}
+		if (get_user(old_block, (long __user *)arg)) {
+			result = -EFAULT;
+			goto out;
+		}
 		result = udf_relocate_blocks(inode->i_sb,
 						old_block, &new_block);
 		if (result == 0)
 			result = put_user(new_block, (long __user *)arg);
-		return result;
+		goto out;
 	case UDF_GETEASIZE:
 		result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
-		break;
+		goto out;
 	case UDF_GETEABLOCK:
 		result = copy_to_user((char __user *)arg,
 				      UDF_I(inode)->i_ext.i_data,
 				      UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
-		break;
+		goto out;
 	}
 
+out:
+	unlock_kernel();
 	return result;
 }
 
@@ -207,7 +218,7 @@ static int udf_release_file(struct inode *inode, struct file *filp)
 const struct file_operations udf_file_operations = {
 	.read			= do_sync_read,
 	.aio_read		= generic_file_aio_read,
-	.ioctl			= udf_ioctl,
+	.unlocked_ioctl		= udf_ioctl,
 	.open			= dquot_file_open,
 	.mmap			= generic_file_mmap,
 	.write			= do_sync_write,
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 702a114..9079ff7 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -130,8 +130,7 @@ extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
 			uint8_t *, uint8_t *);
 
 /* file.c */
-extern int udf_ioctl(struct inode *, struct file *, unsigned int,
-		     unsigned long);
+extern long udf_ioctl(struct file *, unsigned int, unsigned long);
 extern int udf_setattr(struct dentry *dentry, struct iattr *iattr);
 /* inode.c */
 extern struct inode *udf_iget(struct super_block *, struct kernel_lb_addr *);
-- 
2.7.4