#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>
struct file *file = fget(fd);
struct address_space *mapping;
struct backing_dev_info *bdi;
- loff_t endbyte;
+ loff_t endbyte; /* inclusive */
pgoff_t start_index;
pgoff_t end_index;
unsigned long nrpages;
if (!file)
return -EBADF;
+ if (S_ISFIFO(file->f_dentry->d_inode->i_mode)) {
+ ret = -ESPIPE;
+ goto out;
+ }
+
mapping = file->f_mapping;
if (!mapping || len < 0) {
ret = -EINVAL;
goto out;
}
+ if (mapping->a_ops->get_xip_page)
+ /* no bad return value, but ignore advice */
+ goto out;
+
/* Careful about overflows. Len == 0 means "as much as possible" */
endbyte = offset + len;
if (!len || endbyte < len)
endbyte = -1;
+ else
+ endbyte--; /* inclusive */
bdi = mapping->backing_dev_info;
file->f_ra.ra_pages = bdi->ra_pages * 2;
break;
case POSIX_FADV_WILLNEED:
- case POSIX_FADV_NOREUSE:
if (!mapping->a_ops->readpage) {
ret = -EINVAL;
break;
/* First and last PARTIAL page! */
start_index = offset >> PAGE_CACHE_SHIFT;
- end_index = (endbyte-1) >> PAGE_CACHE_SHIFT;
+ end_index = endbyte >> PAGE_CACHE_SHIFT;
/* Careful about overflow on the "+1" */
nrpages = end_index - start_index + 1;
if (ret > 0)
ret = 0;
break;
+ case POSIX_FADV_NOREUSE:
+ break;
case POSIX_FADV_DONTNEED:
if (!bdi_write_congested(mapping->backing_dev_info))
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-1);
+ if (end_index >= start_index)
+ invalidate_mapping_pages(mapping, start_index,
+ end_index);
break;
default:
ret = -EINVAL;