unsigned long nr, ret;
cond_resched();
- if (index == next_index)
- next_index = page_cache_readahead(mapping, &ra, filp,
- index, last_index - index);
-
find_page:
page = find_get_page(mapping, index);
- if (unlikely(page == NULL)) {
- handle_ra_miss(mapping, &ra, index);
- goto no_cached_page;
+ if (!page) {
+ page_cache_sync_readahead(mapping,
+ &ra, filp,
+ index, last_index - index);
+ page = find_get_page(mapping, index);
+ if (unlikely(page == NULL))
+ goto no_cached_page;
+ }
+ if (PageReadahead(page)) {
+ page_cache_async_readahead(mapping,
+ &ra, filp, page,
+ index, last_index - index);
}
if (!PageUptodate(page))
goto page_not_up_to_date;
out:
*_ra = ra;
+ _ra->prev_index = prev_index;
*ppos = ((loff_t) index << PAGE_CACHE_SHIFT) + offset;
if (cached_page)
}
EXPORT_SYMBOL(generic_file_aio_read);
-int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size)
-{
- ssize_t written;
- unsigned long count = desc->count;
- struct file *file = desc->arg.data;
-
- if (size > count)
- size = count;
-
- written = file->f_op->sendpage(file, page, offset,
- size, &file->f_pos, size<count);
- if (written < 0) {
- desc->error = written;
- written = 0;
- }
- desc->count = count - written;
- desc->written += written;
- return written;
-}
-
static ssize_t
do_readahead(struct address_space *mapping, struct file *filp,
unsigned long index, unsigned long nr)
if (VM_RandomReadHint(vma))
goto no_cached_page;
- /*
- * The readahead code wants to be told about each and every page
- * so it can build and shrink its windows appropriately
- *
- * For sequential accesses, we use the generic readahead logic.
- */
- if (VM_SequentialReadHint(vma))
- page_cache_readahead(mapping, ra, file, vmf->pgoff, 1);
-
/*
* Do we have something in the page cache already?
*/
retry_find:
page = find_lock_page(mapping, vmf->pgoff);
+ /*
+ * For sequential accesses, we use the generic readahead logic.
+ */
+ if (VM_SequentialReadHint(vma)) {
+ if (!page) {
+ page_cache_sync_readahead(mapping, ra, file,
+ vmf->pgoff, 1);
+ page = find_lock_page(mapping, vmf->pgoff);
+ if (!page)
+ goto no_cached_page;
+ }
+ if (PageReadahead(page)) {
+ page_cache_async_readahead(mapping, ra, file, page,
+ vmf->pgoff, 1);
+ }
+ }
+
if (!page) {
unsigned long ra_pages;
- if (VM_SequentialReadHint(vma)) {
- handle_ra_miss(mapping, ra, vmf->pgoff);
- goto no_cached_page;
- }
ra->mmap_miss++;
/*
size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (unlikely(vmf->pgoff >= size)) {
unlock_page(page);
+ page_cache_release(page);
goto outside_data_content;
}
* Found the page and have a reference on it.
*/
mark_page_accessed(page);
+ ra->prev_index = page->index;
vmf->page = page;
return ret | VM_FAULT_LOCKED;