void nilfs_clear_dirty_pages(struct address_space *mapping)
{
	struct pagevec pvec;
	unsigned int i;
	pgoff_t index = 0;

	pagevec_init(&pvec, 0);

	while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
				  PAGEVEC_SIZE)) {
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];
			struct buffer_head *bh, *head;

			lock_page(page);
			ClearPageUptodate(page);
			ClearPageMappedToDisk(page);
			bh = head = page_buffers(page);
			do {
				lock_buffer(bh);
				clear_buffer_dirty(bh);
				clear_buffer_nilfs_volatile(bh);
				clear_buffer_uptodate(bh);
				clear_buffer_mapped(bh);
				unlock_buffer(bh);
				bh = bh->b_this_page;
			} while (bh != head);

			__nilfs_clear_page_dirty(page);
			unlock_page(page);
		}
		pagevec_release(&pvec);
		cond_resched();
	}
}

/**
 * nilfs_copy_back_pages -- copy back pages to original cache from shadow cache
 * @dmap: destination page cache
 * @smap: source page cache
 *
 * No pages must no be added to the cache during this process.
 * This must be ensured by the caller.
 */
void nilfs_copy_back_pages(struct address_space *dmap,
			   struct address_space *smap)
{
	struct pagevec pvec;
	unsigned int i, n;
	pgoff_t index = 0;
	int err;

	pagevec_init(&pvec);
repeat:
	n = pagevec_lookup(&pvec, smap, &index);
	if (!n)
		return;

	for (i = 0; i < pagevec_count(&pvec); i++) {
		struct page *page = pvec.pages[i], *dpage;
		pgoff_t offset = page->index;

		lock_page(page);
		dpage = find_lock_page(dmap, offset);
		if (dpage) {
			/* override existing page on the destination cache */
			WARN_ON(PageDirty(dpage));
			nilfs_copy_page(dpage, page, 0);
			unlock_page(dpage);
			put_page(dpage);
		} else {
			struct page *page2;

			/* move the page to the destination cache */
			spin_lock_irq(&smap->tree_lock);
			page2 = radix_tree_delete(&smap->page_tree, offset);
			WARN_ON(page2 != page);

			smap->nrpages--;
			spin_unlock_irq(&smap->tree_lock);

			spin_lock_irq(&dmap->tree_lock);
			err = radix_tree_insert(&dmap->page_tree, offset, page);
			if (unlikely(err < 0)) {
				WARN_ON(err == -EEXIST);
				page->mapping = NULL;
				put_page(page); /* for cache */
			} else {
				page->mapping = dmap;
				dmap->nrpages++;
				if (PageDirty(page))
					radix_tree_tag_set(&dmap->page_tree,
							   offset,
							   PAGECACHE_TAG_DIRTY);
			}
			spin_unlock_irq(&dmap->tree_lock);
		}
		unlock_page(page);
	}
	pagevec_release(&pvec);
	cond_resched();

	goto repeat;
}

///////////////////////////////////////////////////////////
// trace_pages
//
//
///////////////////////////////////////////////////////////
unsigned
trace_pages(
    IN struct address_space* mapping
    )
{
  struct pagevec pvec;
  pgoff_t next = 0;
  unsigned Ret = 0;
  int i;

  pagevec_init( &pvec, 0 );

  while ( pagevec_lookup( &pvec, mapping, next, PAGEVEC_SIZE ) ) {
    for ( i = 0; i < pvec.nr; i++ ) {
      struct page *page = pvec.pages[i];
      void* d = kmap_atomic( page, KM_USER0 );
      DebugTrace( 0, UFSD_LEVEL_VFS, ("p=%p o=%llx f=%lx%s\n", page, (UINT64)page->index << PAGE_CACHE_SHIFT, page->flags, IsZero( d, PAGE_CACHE_SIZE )?", zero" : "" ));
      TracePageBuffers( page, 0 );
      kunmap_atomic( d, KM_USER0 );
      if ( page->index > next )
        next = page->index;
      Ret += 1;
      next += 1;
    }
    pagevec_release(&pvec);
  }
  if ( 0 == next )
    DebugTrace( 0, UFSD_LEVEL_VFS, ("no pages\n"));
  return Ret;
}

/*
 * indication the cookie is no longer uncached
 * - this function is called when the backing store currently caching a cookie
 *   is removed
 * - the netfs should use this to clean up any markers indicating cached pages
 * - this is mandatory for any object that may have data
 */
static void afs_vnode_cache_now_uncached(void *cookie_netfs_data)
{
	struct afs_vnode *vnode = cookie_netfs_data;
	struct pagevec pvec;
	pgoff_t first;
	int loop, nr_pages;

	_enter("{%x,%x,%Lx}",
	       vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version);

	pagevec_init(&pvec, 0);
	first = 0;

	for (;;) {
		/* grab a bunch of pages to clean */
		nr_pages = pagevec_lookup(&pvec, vnode->vfs_inode.i_mapping,
					  first,
					  PAGEVEC_SIZE - pagevec_count(&pvec));
		if (!nr_pages)
			break;

		for (loop = 0; loop < nr_pages; loop++)
			ClearPageFsCache(pvec.pages[loop]);

		first = pvec.pages[nr_pages - 1]->index + 1;

		pvec.nr = nr_pages;
		pagevec_release(&pvec);
		cond_resched();
	}

	_leave("");
}

/**
 * invalidate_inode_pages2 - remove all unmapped pages from an address_space
 * @mapping - the address_space
 *
 * invalidate_inode_pages2() is like truncate_inode_pages(), except for the case
 * where the page is seen to be mapped into process pagetables.  In that case,
 * the page is marked clean but is left attached to its address_space.
 *
 * The page is also marked not uptodate so that a subsequent pagefault will
 * perform I/O to bringthe page's contents back into sync with its backing
 * store.
 *
 * FIXME: invalidate_inode_pages2() is probably trivially livelockable.
 */
void invalidate_inode_pages2(struct address_space *mapping)
{
	struct pagevec pvec;
	pgoff_t next = 0;
	int i;

	pagevec_init(&pvec, 0);
	while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			lock_page(page);
			if (page->mapping == mapping) {	/* truncate race? */
				wait_on_page_writeback(page);
				next = page->index + 1;
				if (page_mapped(page)) {
					clear_page_dirty(page);
					ClearPageUptodate(page);
				} else {
					if (!invalidate_complete_page(mapping,
								      page)) {
						clear_page_dirty(page);
						ClearPageUptodate(page);
					}
				}
			}
			unlock_page(page);
		}
		pagevec_release(&pvec);
		cond_resched();
	}
}

/*
 * Indication from FS-Cache that the cookie is no longer cached
 * - This function is called when the backing store currently caching a cookie
 *   is removed
 * - The netfs should use this to clean up any markers indicating cached pages
 * - This is mandatory for any object that may have data
 */
static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
{
	struct nfs_inode *nfsi = cookie_netfs_data;
	struct pagevec pvec;
	pgoff_t first;
	int loop, nr_pages;

	pagevec_init(&pvec, 0);
	first = 0;

	dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);

	for (;;) {
		/* grab a bunch of pages to unmark */
		nr_pages = pagevec_lookup(&pvec,
					  nfsi->vfs_inode.i_mapping,
					  first,
					  PAGEVEC_SIZE - pagevec_count(&pvec));
		if (!nr_pages)
			break;

		for (loop = 0; loop < nr_pages; loop++)
			ClearPageFsCache(pvec.pages[loop]);

		first = pvec.pages[nr_pages - 1]->index + 1;

		pvec.nr = nr_pages;
		pagevec_release(&pvec);
		cond_resched();
	}
}

static void v9fs_cache_inode_now_uncached(void *cookie_netfs_data)
{
	struct v9fs_inode *v9inode = cookie_netfs_data;
	struct pagevec pvec;
	pgoff_t first;
	int loop, nr_pages;

	pagevec_init(&pvec, 0);
	first = 0;

	for (;;) {
		nr_pages = pagevec_lookup(&pvec, v9inode->vfs_inode.i_mapping,
					  first,
					  PAGEVEC_SIZE - pagevec_count(&pvec));
		if (!nr_pages)
			break;

		for (loop = 0; loop < nr_pages; loop++)
			ClearPageFsCache(pvec.pages[loop]);

		first = pvec.pages[nr_pages - 1]->index + 1;

		pvec.nr = nr_pages;
		pagevec_release(&pvec);
		cond_resched();
	}
}

static void cifs_fscache_inode_now_uncached(void *cookie_netfs_data)
{
	struct cifsInodeInfo *cifsi = cookie_netfs_data;
	struct pagevec pvec;
	pgoff_t first;
	int loop, nr_pages;

	pagevec_init(&pvec, 0);
	first = 0;

	cFYI(1, "cifs inode 0x%p now uncached", cifsi);

	for (;;) {
		nr_pages = pagevec_lookup(&pvec,
					  cifsi->vfs_inode.i_mapping, first,
					  PAGEVEC_SIZE - pagevec_count(&pvec));
		if (!nr_pages)
			break;

		for (loop = 0; loop < nr_pages; loop++)
			ClearPageFsCache(pvec.pages[loop]);

		first = pvec.pages[nr_pages - 1]->index + 1;

		pvec.nr = nr_pages;
		pagevec_release(&pvec);
		cond_resched();
	}
}

static int gfs2_write_cache_jdata(struct address_space *mapping,
				  struct writeback_control *wbc)
{
	struct backing_dev_info *bdi = mapping->backing_dev_info;
	int ret = 0;
	int done = 0;
	struct pagevec pvec;
	int nr_pages;
	pgoff_t index;
	pgoff_t end;
	int scanned = 0;
	int range_whole = 0;

	if (wbc->nonblocking && bdi_write_congested(bdi)) {
		wbc->encountered_congestion = 1;
		return 0;
	}

	pagevec_init(&pvec, 0);
	if (wbc->range_cyclic) {
		index = mapping->writeback_index; /* Start from prev offset */
		end = -1;
	} else {
		index = wbc->range_start >> PAGE_CACHE_SHIFT;
		end = wbc->range_end >> PAGE_CACHE_SHIFT;
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
			range_whole = 1;
		scanned = 1;
	}

retry:
	 while (!done && (index <= end) &&
		(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
					       PAGECACHE_TAG_DIRTY,
					       min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
		scanned = 1;
		ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end);
		if (ret)
			done = 1;
		if (ret > 0)
			ret = 0;

		pagevec_release(&pvec);
		cond_resched();
	}

	if (!scanned && !done) {
		/*
		 * We hit the last page and there is more work to be done: wrap
		 * back to the start of the file
		 */
		scanned = 1;
		index = 0;
		goto retry;
	}

	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = index;
	return ret;
}

/**
 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
 * @mapping: the address_space which holds the pages to invalidate
 * @start: the offset 'from' which to invalidate
 * @end: the offset 'to' which to invalidate (inclusive)
 *
 * This function only removes the unlocked pages, if you want to
 * remove all the pages of one inode, you must call truncate_inode_pages.
 *
 * invalidate_mapping_pages() will not block on IO activity. It will not
 * invalidate pages which are dirty, locked, under writeback or mapped into
 * pagetables.
 */
unsigned long invalidate_mapping_pages(struct address_space *mapping,
		pgoff_t start, pgoff_t end)
{
	struct pagevec pvec;
	pgoff_t index = start;
	unsigned long ret;
	unsigned long count = 0;
	int i;

	/*
	 * Note: this function may get called on a shmem/tmpfs mapping:
	 * pagevec_lookup() might then return 0 prematurely (because it
	 * got a gangful of swap entries); but it's hardly worth worrying
	 * about - it can rarely have anything to free from such a mapping
	 * (most pages are dirty), and already skips over any difficulties.
	 */

	pagevec_init(&pvec, 0);
	while (index <= end && pagevec_lookup(&pvec, mapping, index,
			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
		mem_cgroup_uncharge_start();
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			/* We rely upon deletion not changing page->index */
			index = page->index;
			if (index > end)
				break;

			if (!trylock_page(page))
				continue;
			WARN_ON(page->index != index);
			ret = invalidate_inode_page(page);
			unlock_page(page);
			/*
			 * Invalidation is a hint that the page is no longer
			 * of interest and try to speed up its reclaim.
			 */
			if (!ret)
				deactivate_page(page);
			count += ret;
		}
		pagevec_release(&pvec);
		mem_cgroup_uncharge_end();
		cond_resched();
		index++;
	}
	return count;
}

/**
 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
 * @mapping: the address_space which holds the pages to invalidate
 * @start: the offset 'from' which to invalidate
 * @end: the offset 'to' which to invalidate (inclusive)
 *
 * This function only removes the unlocked pages, if you want to
 * remove all the pages of one inode, you must call truncate_inode_pages.
 *
 * invalidate_mapping_pages() will not block on IO activity. It will not
 * invalidate pages which are dirty, locked, under writeback or mapped into
 * pagetables.
 */
unsigned long invalidate_mapping_pages(struct address_space *mapping,
		pgoff_t start, pgoff_t end)
{
	pgoff_t indices[PAGEVEC_SIZE];
	struct pagevec pvec;
	pgoff_t index = start;
	unsigned long ret;
	unsigned long count = 0;
	int i;

	pagevec_init(&pvec, 0);
	while (index <= end && __pagevec_lookup(&pvec, mapping, index,
			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
			indices)) {
		mem_cgroup_uncharge_start();
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			/* We rely upon deletion not changing page->index */
			index = indices[i];
			if (index > end)
				break;

			if (radix_tree_exceptional_entry(page)) {
				clear_exceptional_entry(mapping, index, page);
				continue;
			}

			if (!trylock_page(page))
				continue;
			WARN_ON(page->index != index);
			ret = invalidate_inode_page(page);
			unlock_page(page);
			/*
			 * Invalidation is a hint that the page is no longer
			 * of interest and try to speed up its reclaim.
			 */
			if (!ret)
				deactivate_page(page);
			count += ret;
		}
		pagevec_remove_exceptionals(&pvec);
		pagevec_release(&pvec);
		mem_cgroup_uncharge_end();
		cond_resched();
		index++;
	}
	return count;
}

int nilfs_copy_dirty_pages(struct address_space *dmap,
			   struct address_space *smap)
{
	struct pagevec pvec;
	unsigned int i;
	pgoff_t index = 0;
	int err = 0;

	pagevec_init(&pvec, 0);
repeat:
	if (!pagevec_lookup_tag(&pvec, smap, &index, PAGECACHE_TAG_DIRTY,
				PAGEVEC_SIZE))
		return 0;

	for (i = 0; i < pagevec_count(&pvec); i++) {
		struct page *page = pvec.pages[i], *dpage;

		lock_page(page);
		if (unlikely(!PageDirty(page)))
			NILFS_PAGE_BUG(page, "inconsistent dirty state");

		dpage = grab_cache_page(dmap, page->index);
		if (unlikely(!dpage)) {
			/* No empty page is added to the page cache */
			err = -ENOMEM;
			unlock_page(page);
			break;
		}
		if (unlikely(!page_has_buffers(page)))
			NILFS_PAGE_BUG(page,
				       "found empty page in dat page cache");

		nilfs_copy_page(dpage, page, 1);
		__set_page_dirty_nobuffers(dpage);

		unlock_page(dpage);
		page_cache_release(dpage);
		unlock_page(page);
	}
	pagevec_release(&pvec);
	cond_resched();

	if (likely(!err))
		goto repeat;
	return err;
}

/*
 * Radix-tree checker
 */
void nilfs_check_radix_tree(const char *fname, int line,
			    struct address_space *mapping, int tag)
{
	struct pagevec pvec;
	unsigned int i, n;
	pgoff_t index = 0;
	char *page_type;
	int nr_found = 0;

	if (tag == PAGECACHE_TAG_DIRTY)
		page_type = "dirty";
	else if (tag == PAGECACHE_TAG_WRITEBACK)
		page_type = "writeback";
	else
		page_type = "leaking";

	pagevec_init(&pvec, 0);
 repeat:
	if (tag < 0) {
		n = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
		if (n)
			index = pvec.pages[n - 1]->index + 1;
	} else
		n = pagevec_lookup_tag(&pvec, mapping, &index, tag,
				       PAGEVEC_SIZE);
	if (!n) {
		if (nr_found)
			printk(KERN_WARNING "%s: found %d %s pages\n",
			       fname, nr_found, page_type);
		return;
	}

	for (i = 0; i < n; i++) {
		nilfs_page_debug(fname, line, pvec.pages[i], "%s page",
				 page_type);
		nr_found++;
	}
	pagevec_release(&pvec);
	cond_resched();
	goto repeat;
}

/**
 * nilfs_clear_dirty_pages - discard dirty pages in address space
 * @mapping: address space with dirty pages for discarding
 * @silent: suppress [true] or print [false] warning messages
 */
void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
{
	struct pagevec pvec;
	unsigned int i;
	pgoff_t index = 0;

	pagevec_init(&pvec);

	while (pagevec_lookup_tag(&pvec, mapping, &index,
					PAGECACHE_TAG_DIRTY)) {
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			lock_page(page);
			nilfs_clear_dirty_page(page, silent);
			unlock_page(page);
		}
		pagevec_release(&pvec);
		cond_resched();
	}
}

/**
 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
 * @mapping: the address_space which holds the pages to invalidate
 * @start: the offset 'from' which to invalidate
 * @end: the offset 'to' which to invalidate (inclusive)
 *
 * This function only removes the unlocked pages, if you want to
 * remove all the pages of one inode, you must call truncate_inode_pages.
 *
 * invalidate_mapping_pages() will not block on IO activity. It will not
 * invalidate pages which are dirty, locked, under writeback or mapped into
 * pagetables.
 */
unsigned long invalidate_mapping_pages(struct address_space *mapping,
				pgoff_t start, pgoff_t end)
{
	struct pagevec pvec;
	pgoff_t next = start;
	unsigned long ret = 0;
	int i;

	pagevec_init(&pvec, 0);
	while (next <= end &&
			pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			if (TestSetPageLocked(page)) {
				next++;
				continue;
			}
			if (page->index > next)
				next = page->index;
			next++;
			if (PageDirty(page) || PageWriteback(page))
				goto unlock;
			if (page_mapped(page))
				goto unlock;
			ret += invalidate_complete_page(mapping, page);
unlock:
			unlock_page(page);
			if (next > end)
				break;
		}
		pagevec_release(&pvec);
		cond_resched();
	}
	return ret;
}

/**
 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
 * @mapping: the address_space which holds the pages to invalidate
 * @start: the offset 'from' which to invalidate
 * @end: the offset 'to' which to invalidate (inclusive)
 *
 * This function only removes the unlocked pages, if you want to
 * remove all the pages of one inode, you must call truncate_inode_pages.
 *
 * invalidate_mapping_pages() will not block on IO activity. It will not
 * invalidate pages which are dirty, locked, under writeback or mapped into
 * pagetables.
 */
unsigned long invalidate_mapping_pages(struct address_space *mapping,
		pgoff_t start, pgoff_t end)
{
	pgoff_t indices[PAGEVEC_SIZE];
	struct pagevec pvec;
	pgoff_t index = start;
	unsigned long ret;
	unsigned long count = 0;
	int i;

	pagevec_init(&pvec, 0);
	while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
			min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
			indices)) {
		for (i = 0; i < pagevec_count(&pvec); i++) {
			struct page *page = pvec.pages[i];

			/* We rely upon deletion not changing page->index */
			index = indices[i];
			if (index > end)
				break;

			if (radix_tree_exceptional_entry(page)) {
				clear_exceptional_entry(mapping, index, page);
				continue;
			}

			if (!trylock_page(page))
				continue;

			WARN_ON(page_to_index(page) != index);

			/* Middle of THP: skip */
			if (PageTransTail(page)) {
				unlock_page(page);
				continue;
			} else if (PageTransHuge(page)) {
				index += HPAGE_PMD_NR - 1;
				i += HPAGE_PMD_NR - 1;
				/* 'end' is in the middle of THP */
				if (index ==  round_down(end, HPAGE_PMD_NR))
					continue;
			}

			ret = invalidate_inode_page(page);
			unlock_page(page);
			/*
			 * Invalidation is a hint that the page is no longer
			 * of interest and try to speed up its reclaim.
			 */
			if (!ret)
				deactivate_file_page(page);
			count += ret;
		}
		pagevec_remove_exceptionals(&pvec);
		pagevec_release(&pvec);
		cond_resched();
		index++;
	}
	return count;
}

//.........这里部分代码省略.........

			done_index = page->index + 1;

			lock_page(page);

			/*
			 * Page truncated or invalidated. We can freely skip it
			 * then, even for data integrity operations: the page
			 * has disappeared concurrently, so there could be no
			 * real expectation of this data interity operation
			 * even if there is now a new, dirty page at the same
			 * pagecache address.
			 */
			if (unlikely(page->mapping != mapping)) {
continue_unlock:
				unlock_page(page);
				continue;
			}

			if (!PageDirty(page)) {
				/* someone wrote it for us */
				goto continue_unlock;
			}

			if (PageWriteback(page)) {
				if (wbc->sync_mode != WB_SYNC_NONE)
					wait_on_page_writeback(page);
				else
					goto continue_unlock;
			}

			BUG_ON(PageWriteback(page));
			if (!clear_page_dirty_for_io(page))
				goto continue_unlock;

			ret = (*writepage)(page, wbc, data);

			if (unlikely(ret)) {
				if (ret == AOP_WRITEPAGE_ACTIVATE) {
					unlock_page(page);
					ret = 0;
				} else {
					/*
					 * done_index is set past this page,
					 * so media errors will not choke
					 * background writeout for the entire
					 * file. This has consequences for
					 * range_cyclic semantics (ie. it may
					 * not be suitable for data integrity
					 * writeout).
					 */
					done = 1;
					break;
				}
 			}

			if (wbc->nr_to_write > 0) {
				wbc->nr_to_write--;
				if (wbc->nr_to_write == 0 &&
				    wbc->sync_mode == WB_SYNC_NONE) {
					/*
					 * We stop writing back only if we are
					 * not doing integrity sync. In case of
					 * integrity sync we have to keep going
					 * because someone may be concurrently
					 * dirtying pages, and we might have
					 * synced a lot of newly appeared dirty
					 * pages, but have not synced all of the
					 * old dirty pages.
					 */
					done = 1;
					break;
				}
			}

			if (wbc->nonblocking && bdi_write_congested(bdi)) {
				wbc->encountered_congestion = 1;
				done = 1;
				break;
			}
		}
		pagevec_release(&pvec);
		cond_resched();
	}
	if (!cycled && !done) {
		/*
		 * range_cyclic:
		 * We hit the last page and there is more work to be done: wrap
		 * back to the start of the file
		 */
		cycled = 1;
		index = 0;
		end = writeback_index - 1;
		goto retry;
	}
	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = done_index;

	return ret;
}

static int gfs2_write_cache_jdata(struct address_space *mapping,
				  struct writeback_control *wbc)
{
	int ret = 0;
	int done = 0;
	struct pagevec pvec;
	int nr_pages;
	pgoff_t uninitialized_var(writeback_index);
	pgoff_t index;
	pgoff_t end;
	pgoff_t done_index;
	int cycled;
	int range_whole = 0;
	int tag;

	pagevec_init(&pvec, 0);
	if (wbc->range_cyclic) {
		writeback_index = mapping->writeback_index; /* prev offset */
		index = writeback_index;
		if (index == 0)
			cycled = 1;
		else
			cycled = 0;
		end = -1;
	} else {
		index = wbc->range_start >> PAGE_CACHE_SHIFT;
		end = wbc->range_end >> PAGE_CACHE_SHIFT;
		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
			range_whole = 1;
		cycled = 1; /* ignore range_cyclic tests */
	}
	if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
		tag = PAGECACHE_TAG_TOWRITE;
	else
		tag = PAGECACHE_TAG_DIRTY;

retry:
	if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
		tag_pages_for_writeback(mapping, index, end);
	done_index = index;
	while (!done && (index <= end)) {
		nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
			      min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
		if (nr_pages == 0)
			break;

		ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index);
		if (ret)
			done = 1;
		if (ret > 0)
			ret = 0;
		pagevec_release(&pvec);
		cond_resched();
	}

	if (!cycled && !done) {
		/*
		 * range_cyclic:
		 * We hit the last page and there is more work to be done: wrap
		 * back to the start of the file
		 */
		cycled = 1;
		index = 0;
		end = writeback_index - 1;
		goto retry;
	}

	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = done_index;

	return ret;
}

//.........这里部分代码省略.........
			}

			done_index = page->index + 1;

			lock_page(page);

			/*
			 * Page truncated or invalidated. We can freely skip it
			 * then, even for data integrity operations: the page
			 * has disappeared concurrently, so there could be no
			 * real expectation of this data interity operation
			 * even if there is now a new, dirty page at the same
			 * pagecache address.
			 */
			if (unlikely(page->mapping != mapping)) {
continue_unlock:
				unlock_page(page);
				continue;
			}

			if (!PageDirty(page)) {
				/* someone wrote it for us */
				goto continue_unlock;
			}

			if (PageWriteback(page)) {
				if (wbc->sync_mode != WB_SYNC_NONE)
					wait_on_page_writeback(page);
				else
					goto continue_unlock;
			}

			BUG_ON(PageWriteback(page));
			if (!clear_page_dirty_for_io(page))
				goto continue_unlock;

			pgs[pgidx++] = page;
		}

		/*trace_wbc_writepage(wbc, mapping->backing_dev_info);*/
		ret = ecryptfs_encrypt_pages(pgs, pgidx);
		//printk("[g-ecryptfs] Info: enc %d pages in writepages\n", pgidx);
		mapping_set_error(mapping, ret);

		for (i = 0; i < nr_pages; i++) {
			page = pvec.pages[i];

			if (unlikely(ret)) {
				if (ret == AOP_WRITEPAGE_ACTIVATE) {
					if (PageLocked(page))
						unlock_page(page);
					ret = 0;
				} else {
					/*
					 * done_index is set past this page,
					 * so media errors will not choke
					 * background writeout for the entire
					 * file. This has consequences for
					 * range_cyclic semantics (ie. it may
					 * not be suitable for data integrity
					 * writeout).
					 */
					done = 1;
					break;
				}
			}

			/*
			 * We stop writing back only if we are not doing
			 * integrity sync. In case of integrity sync we have to
			 * keep going until we have written all the pages
			 * we tagged for writeback prior to entering this loop.
			 */
			if (--wbc->nr_to_write <= 0 &&
			    wbc->sync_mode == WB_SYNC_NONE) {
				done = 1;
				break;
			}
		}
		pagevec_release(&pvec);
		cond_resched();
	}
	if (!cycled && !done) {
		/*
		 * range_cyclic:
		 * We hit the last page and there is more work to be done: wrap
		 * back to the start of the file
		 */
		cycled = 1;
		index = 0;
		end = writeback_index - 1;
		goto retry;
	}
	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
		mapping->writeback_index = done_index;

	kfree(pgs);

	return ret;
}

//.........这里部分代码省略.........
            cycled = 0;
        end = -1;
    } else {
        index = wbc->range_start >> PAGE_CACHE_SHIFT;
        end = wbc->range_end >> PAGE_CACHE_SHIFT;
        if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
            range_whole = 1;
        cycled = 1; /* ignore range_cyclic tests */
    }
    if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
        tag = PAGECACHE_TAG_TOWRITE;
    else
        tag = PAGECACHE_TAG_DIRTY;
retry:
    if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
        tag_pages_for_writeback(mapping, index, end);
    done_index = index;
    while (!done && (index <= end)) {
        int i;

        nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
                                      min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1);
        if (nr_pages == 0)
            break;

        for (i = 0; i < nr_pages; i++) {
            struct page *page = pvec.pages[i];

            if (page->index > end) {
                done = 1;
                break;
            }

            done_index = page->index;

            lock_page(page);

            if (unlikely(page->mapping != mapping)) {
continue_unlock:
                unlock_page(page);
                continue;
            }

            if (!PageDirty(page)) {
                /* someone wrote it for us */
                goto continue_unlock;
            }

            if (step == is_cold_data(page))
                goto continue_unlock;

            if (PageWriteback(page)) {
                if (wbc->sync_mode != WB_SYNC_NONE)
                    f2fs_wait_on_page_writeback(page, DATA);
                else
                    goto continue_unlock;
            }

            BUG_ON(PageWriteback(page));
            if (!clear_page_dirty_for_io(page))
                goto continue_unlock;

            ret = (*writepage)(page, wbc, data);
            if (unlikely(ret)) {
                if (ret == AOP_WRITEPAGE_ACTIVATE) {
                    unlock_page(page);
                    ret = 0;
                } else {
                    done_index = page->index + 1;
                    done = 1;
                    break;
                }
            }

            if (--wbc->nr_to_write <= 0 &&
                    wbc->sync_mode == WB_SYNC_NONE) {
                done = 1;
                break;
            }
        }
        pagevec_release(&pvec);
        cond_resched();
    }

    if (step < 1) {
        step++;
        goto next;
    }

    if (!cycled && !done) {
        cycled = 1;
        index = 0;
        end = writeback_index - 1;
        goto retry;
    }
    if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
        mapping->writeback_index = done_index;

    return ret;
}