#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/mm.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/task_io_accounting_ops.h>
unsigned long req_size)
{
unsigned long max = max_sane_readahead(ra->ra_pages);
+ pgoff_t prev_offset;
/*
* start of file
/*
* sequential cache miss
+ * trivial case: (offset - prev_offset) == 1
+ * unaligned reads: (offset - prev_offset) == 0
*/
- if (offset - (ra->prev_pos >> PAGE_CACHE_SHIFT) <= 1UL)
+ prev_offset = (unsigned long long)ra->prev_pos >> PAGE_CACHE_SHIFT;
+ if (offset - prev_offset <= 1UL)
goto initial_readahead;
/*