pagemap.h (712cba5d87a6c0e980ee5fad45734e189c4d7151) pagemap.h (5cbc198ae08d84bd416b672ad8bd1222acd0855c)
1#ifndef _LINUX_PAGEMAP_H
2#define _LINUX_PAGEMAP_H
3
4/*
5 * Copyright 1995 Linus Torvalds
6 */
7#include <linux/mm.h>
8#include <linux/fs.h>

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369static inline struct page *read_mapping_page(struct address_space *mapping,
370 pgoff_t index, void *data)
371{
372 filler_t *filler = (filler_t *)mapping->a_ops->readpage;
373 return read_cache_page(mapping, index, filler, data);
374}
375
376/*
1#ifndef _LINUX_PAGEMAP_H
2#define _LINUX_PAGEMAP_H
3
4/*
5 * Copyright 1995 Linus Torvalds
6 */
7#include <linux/mm.h>
8#include <linux/fs.h>

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369static inline struct page *read_mapping_page(struct address_space *mapping,
370 pgoff_t index, void *data)
371{
372 filler_t *filler = (filler_t *)mapping->a_ops->readpage;
373 return read_cache_page(mapping, index, filler, data);
374}
375
376/*
377 * Get the offset in PAGE_SIZE.
378 * (TODO: hugepage should have ->index in PAGE_SIZE)
377 * Get index of the page with in radix-tree
378 * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)
379 */
379 */
380static inline pgoff_t page_to_pgoff(struct page *page)
380static inline pgoff_t page_to_index(struct page *page)
381{
382 pgoff_t pgoff;
383
381{
382 pgoff_t pgoff;
383
384 if (unlikely(PageHeadHuge(page)))
385 return page->index << compound_order(page);
386
387 if (likely(!PageTransTail(page)))
388 return page->index;
389
390 /*
391 * We don't initialize ->index for tail pages: calculate based on
392 * head page
393 */
394 pgoff = compound_head(page)->index;
395 pgoff += page - compound_head(page);
396 return pgoff;
397}
398
399/*
384 if (likely(!PageTransTail(page)))
385 return page->index;
386
387 /*
388 * We don't initialize ->index for tail pages: calculate based on
389 * head page
390 */
391 pgoff = compound_head(page)->index;
392 pgoff += page - compound_head(page);
393 return pgoff;
394}
395
396/*
397 * Get the offset in PAGE_SIZE.
398 * (TODO: hugepage should have ->index in PAGE_SIZE)
399 */
400static inline pgoff_t page_to_pgoff(struct page *page)
401{
402 if (unlikely(PageHeadHuge(page)))
403 return page->index << compound_order(page);
404
405 return page_to_index(page);
406}
407
408/*
400 * Return byte-offset into filesystem object for page.
401 */
402static inline loff_t page_offset(struct page *page)
403{
404 return ((loff_t)page->index) << PAGE_SHIFT;
405}
406
407static inline loff_t page_file_offset(struct page *page)

--- 210 unchanged lines hidden --- 		409 * Return byte-offset into filesystem object for page.
410 */
411static inline loff_t page_offset(struct page *page)
412{
413 return ((loff_t)page->index) << PAGE_SHIFT;
414}
415
416static inline loff_t page_file_offset(struct page *page)

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