Commit cb33cf00 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] check for presence of readpage() in the readahead code

Make sure that the address_space is capable of performing the readahead
before going in and allocating the pages.
parent b068fc92
......@@ -260,6 +260,9 @@ int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
{
int ret = 0;
if (unlikely(!mapping->a_ops->readpage && !mapping->a_ops->readpages))
return -EINVAL;
while (nr_to_read) {
int err;
......
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