ceph: don't truncate dirty pages in invalidate work thread

#include <linux/namei.h>

#include <linux/writeback.h>

#include <linux/vmalloc.h>

#include <linux/pagevec.h>

#include "super.h"

#include "decode.h"

	}

}

/*

 * invalidate any pages that are not dirty or under writeback.  this

 * includes pages that are clean and mapped.

 */

static void ceph_invalidate_nondirty_pages(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];

			pgoff_t index;

			int skip_page =

				(PageDirty(page) || PageWriteback(page));

			if (!skip_page)

				skip_page = !trylock_page(page);

			/*

			 * We really shouldn't be looking at the ->index of an

			 * unlocked page.  But we're not allowed to lock these

			 * pages.  So we rely upon nobody altering the ->index

			 * of this (pinned-by-us) page.

			 */

			index = page->index;

			if (index > next)

				next = index;

			next++;

			if (skip_page)

				continue;

			generic_error_remove_page(mapping, page);

			unlock_page(page);

		}

		pagevec_release(&pvec);

		cond_resched();

	}

}

/*

 * Invalidate inode pages in a worker thread.  (This can't be done

 * in the message handler context.)

	orig_gen = ci->i_rdcache_gen;

	spin_unlock(&inode->i_lock);

	truncate_inode_pages(&inode->i_data, 0);

	ceph_invalidate_nondirty_pages(inode->i_mapping);

	spin_lock(&inode->i_lock);

	if (orig_gen == ci->i_rdcache_gen) {