dcache_{readdir,dir_lseek}() users: switch to ->iterate_shared

no need to lock directory in dcache_dir_lseek(), while we are
at it - per-struct file exclusion is enough.

Signed-off-by: Al Viro <[e-mail]>

arch/powerpc/platforms/cell/spufs/inode.c

···
 	.release	= spufs_dir_close,
 	.llseek		= dcache_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.fsync		= noop_fsync,
 };
 EXPORT_SYMBOL_GPL(spufs_context_fops);

fs/autofs4/root.c

···
 	.open		= dcache_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
 	.unlocked_ioctl	= autofs4_root_ioctl,
 #ifdef CONFIG_COMPAT
···
 	.open		= autofs4_dir_open,
 	.release	= dcache_dir_close,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.llseek		= dcache_dir_lseek,
 };
 

fs/libfs.c

···
 loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
 {
 	struct dentry *dentry = file->f_path.dentry;
-	inode_lock(d_inode(dentry));
 	switch (whence) {
 		case 1:
 			offset += file->f_pos;
···
 			if (offset >= 0)
 				break;
 		default:
-			inode_unlock(d_inode(dentry));
 			return -EINVAL;
 	}
 	if (offset != file->f_pos) {
···
 			spin_unlock(&dentry->d_lock);
 		}
 	}
-	inode_unlock(d_inode(dentry));
 	return offset;
 }
 EXPORT_SYMBOL(dcache_dir_lseek);
···
 	.release	= dcache_dir_close,
 	.llseek		= dcache_dir_lseek,
 	.read		= generic_read_dir,
-	.iterate	= dcache_readdir,
+	.iterate_shared	= dcache_readdir,
 	.fsync		= noop_fsync,
 };
 EXPORT_SYMBOL(simple_dir_operations);