BKL: remove BKL from qnx4

All uses of the BKL in qnx4 were the result of a pushdown into
code that doesn't really need it. As Christoph points out, this
is a read-only file system, which eliminates most of the races in
readdir/lookup.

Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Anders Larsen <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>

fs/qnx4/dir.c

···
  * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
  */
 
-#include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include "qnx4.h"
 
···
 
 	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
 	QNX4DEBUG((KERN_INFO "filp->f_pos         = %ld\n", (long) filp->f_pos));
-
-	lock_kernel();
 
 	while (filp->f_pos < inode->i_size) {
 		blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
···
 		brelse(bh);
 	}
 out:
-	unlock_kernel();
 	return 0;
 }
 

fs/qnx4/inode.c

···
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/highuid.h>
-#include <linux/smp_lock.h>
 #include <linux/pagemap.h>
 #include <linux/buffer_head.h>
 #include <linux/writeback.h>
···
 	struct super_block *sb = dentry->d_sb;
 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 
-	lock_kernel();
-
 	buf->f_type    = sb->s_magic;
 	buf->f_bsize   = sb->s_blocksize;
 	buf->f_blocks  = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
···
 	buf->f_namelen = QNX4_NAME_MAX;
 	buf->f_fsid.val[0] = (u32)id;
 	buf->f_fsid.val[1] = (u32)(id >> 32);
-
-	unlock_kernel();
 
 	return 0;
 }
···
 	struct qnx4_sb_info *qs;
 	int ret = -EINVAL;
 
-	lock_kernel();
-
 	qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
-	if (!qs) {
-		unlock_kernel();
+	if (!qs)
 		return -ENOMEM;
-	}
 	s->s_fs_info = qs;
 
 	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
···
  		goto outi;
 
 	brelse(bh);
-
-	unlock_kernel();
 	return 0;
 
       outi:
···
       outnobh:
 	kfree(qs);
 	s->s_fs_info = NULL;
-	unlock_kernel();
 	return ret;
 }
 

fs/qnx4/namei.c

···
  * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
  */
 
-#include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include "qnx4.h"
 
···
 	int len = dentry->d_name.len;
 	struct inode *foundinode = NULL;
 
-	lock_kernel();
 	if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
 		goto out;
 	/* The entry is linked, let's get the real info */
···
 
 	foundinode = qnx4_iget(dir->i_sb, ino);
 	if (IS_ERR(foundinode)) {
-		unlock_kernel();
 		QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
 			   PTR_ERR(foundinode)));
 		return ERR_CAST(foundinode);
 	}
 out:
-	unlock_kernel();
 	d_add(dentry, foundinode);
 
 	return NULL;