do_invalidatepage(page, partial);
}
+/*
+ * This cancels just the dirty bit on the kernel page itself, it
+ * does NOT actually remove dirty bits on any mmap's that may be
+ * around. It also leaves the page tagged dirty, so any sync
+ * activity will still find it on the dirty lists, and in particular,
+ * clear_page_dirty_for_io() will still look at the dirty bits in
+ * the VM.
+ *
+ * Doing this should *normally* only ever be done when a page
+ * is truncated, and is not actually mapped anywhere at all. However,
+ * fs/buffer.c does this when it notices that somebody has cleaned
+ * out all the buffers on a page without actually doing it through
+ * the VM. Can you say "ext3 is horribly ugly"? Tought you could.
+ */
void cancel_dirty_page(struct page *page, unsigned int account_size)
{
- /* If we're cancelling the page, it had better not be mapped any more */
- if (page_mapped(page)) {
- static unsigned int warncount;
-
- WARN_ON(++warncount < 5);
- }
-
if (TestClearPageDirty(page)) {
struct address_space *mapping = page->mapping;
if (mapping && mapping_cap_account_dirty(mapping)) {
return 0;
}
+static int do_launder_page(struct address_space *mapping, struct page *page)
+{
+ if (!PageDirty(page))
+ return 0;
+ if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
+ return 0;
+ return mapping->a_ops->launder_page(page);
+}
+
/**
* invalidate_inode_pages2_range - remove range of pages from an address_space
* @mapping: the address_space
PAGE_CACHE_SIZE, 0);
}
}
- if (!invalidate_complete_page2(mapping, page))
+ ret = do_launder_page(mapping, page);
+ if (ret == 0 && !invalidate_complete_page2(mapping, page))
ret = -EIO;
unlock_page(page);
}
pagevec_release(&pvec);
cond_resched();
}
- WARN_ON_ONCE(ret);
return ret;
}
EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);