#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/fadvise.h>
-#include <linux/writeback.h>
#include <linux/syscalls.h>
#include <asm/unistd.h>
/*
* POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
* deactivate the pages and clear PG_Referenced.
- *
- * LINUX_FADV_ASYNC_WRITE: start async writeout of any dirty pages between file
- * offsets `offset' and `offset+len' inclusive. Any pages which are currently
- * under writeout are skipped, whether or not they are dirty.
- *
- * LINUX_FADV_WRITE_WAIT: wait upon writeout of any dirty pages between file
- * offsets `offset' and `offset+len'.
- *
- * By combining these two operations the application may do several things:
- *
- * LINUX_FADV_ASYNC_WRITE: push some or all of the dirty pages at the disk.
- *
*/
asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
{
struct file *file = fget(fd);
struct address_space *mapping;
struct backing_dev_info *bdi;
- loff_t endbyte; /* inclusive */
+ loff_t endbyte;
pgoff_t start_index;
pgoff_t end_index;
unsigned long nrpages;
endbyte = offset + len;
if (!len || endbyte < len)
endbyte = -1;
- else
- endbyte--; /* inclusive */
bdi = mapping->backing_dev_info;
/* First and last PARTIAL page! */
start_index = offset >> PAGE_CACHE_SHIFT;
- end_index = endbyte >> PAGE_CACHE_SHIFT;
+ end_index = (endbyte-1) >> PAGE_CACHE_SHIFT;
/* Careful about overflow on the "+1" */
nrpages = end_index - start_index + 1;
filemap_flush(mapping);
/* First and last FULL page! */
- start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
+ start_index = (offset + (PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
end_index = (endbyte >> PAGE_CACHE_SHIFT);
- if (end_index >= start_index)
- invalidate_mapping_pages(mapping, start_index,
- end_index);
+ if (end_index > start_index)
+ invalidate_mapping_pages(mapping, start_index, end_index-1);
break;
default:
ret = -EINVAL;