struct iov_iter *iter, loff_t pos)
{
/*
- * This function returns zero on purpose in order to support direct IO.
- * __dentry_open checks a_ops->direct_IO and returns EINVAL if it is null.
- *
- * However, this function won't be called by certain file operations
- * including generic fs functions. * reads and writes are delivered to
- * the lower file systems and the direct IOs will be handled by them.
- *
- * NOTE: exceptionally, on the recent kernels (since Linux 3.8.x),
- * swap_writepage invokes this function directly.
+ * This function should never be called directly. We need it
+ * to exist, to get past a check in open_check_o_direct(),
+ * which is called from do_last().
*/
- printk(KERN_INFO "%s, operation is not supported\n", __func__);
- return 0;
+ return -EINVAL;
}
-/*
- * XXX: the default address_space_ops for sdcardfs is empty. We cannot set
- * our inode->i_mapping->a_ops to NULL because too many code paths expect
- * the a_ops vector to be non-NULL.
- */
const struct address_space_operations sdcardfs_aops = {
- /* empty on purpose */
.direct_IO = sdcardfs_direct_IO,
};
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