#include <linux/rmap.h>
#include <linux/sched.h>
#include <asm/tlbflush.h>
-#include "filemap.h"
/*
* We do use our own empty page to avoid interference with other users
static struct page *xip_sparse_page(void)
{
if (!__xip_sparse_page) {
- unsigned long zeroes = get_zeroed_page(GFP_HIGHUSER);
- if (zeroes) {
+ struct page *page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
+
+ if (page) {
static DEFINE_SPINLOCK(xip_alloc_lock);
spin_lock(&xip_alloc_lock);
if (!__xip_sparse_page)
- __xip_sparse_page = virt_to_page(zeroes);
+ __xip_sparse_page = page;
else
- free_page(zeroes);
+ __free_page(page);
spin_unlock(&xip_alloc_lock);
}
}
unsigned long index;
unsigned long offset;
size_t copied;
+ char *kaddr;
offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
index = pos >> PAGE_CACHE_SHIFT;
if (bytes > count)
bytes = count;
- /*
- * Bring in the user page that we will copy from _first_.
- * Otherwise there's a nasty deadlock on copying from the
- * same page as we're writing to, without it being marked
- * up-to-date.
- */
- fault_in_pages_readable(buf, bytes);
-
page = a_ops->get_xip_page(mapping,
index*(PAGE_SIZE/512), 0);
if (IS_ERR(page) && (PTR_ERR(page) == -ENODATA)) {
break;
}
- copied = filemap_copy_from_user(page, offset, buf, bytes);
+ fault_in_pages_readable(buf, bytes);
+ kaddr = kmap_atomic(page, KM_USER0);
+ copied = bytes -
+ __copy_from_user_inatomic_nocache(kaddr + offset, buf, bytes);
+ kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
+
if (likely(copied > 0)) {
status = copied;