KVM: IRQ ACK notifier should be used with in-kernel irqchip
[linux-2.6.git] / mm / truncate.c
index 9838c05..1229211 100644 (file)
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2002, Linus Torvalds
  *
- * 10Sep2002   akpm@zip.com.au
+ * 10Sep2002   Andrew Morton
  *             Initial version.
  */
 
@@ -18,6 +18,7 @@
 #include <linux/task_io_accounting_ops.h>
 #include <linux/buffer_head.h> /* grr. try_to_release_page,
                                   do_invalidatepage */
+#include "internal.h"
 
 
 /**
@@ -84,7 +85,7 @@ EXPORT_SYMBOL(cancel_dirty_page);
 
 /*
  * If truncate cannot remove the fs-private metadata from the page, the page
- * becomes anonymous.  It will be left on the LRU and may even be mapped into
+ * becomes orphaned.  It will be left on the LRU and may even be mapped into
  * user pagetables if we're racing with filemap_fault().
  *
  * We need to bale out if page->mapping is no longer equal to the original
@@ -103,8 +104,8 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
 
        cancel_dirty_page(page, PAGE_CACHE_SIZE);
 
+       clear_page_mlock(page);
        remove_from_page_cache(page);
-       ClearPageUptodate(page);
        ClearPageMappedToDisk(page);
        page_cache_release(page);       /* pagecache ref */
 }
@@ -128,14 +129,14 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
        if (PagePrivate(page) && !try_to_release_page(page, 0))
                return 0;
 
+       clear_page_mlock(page);
        ret = remove_mapping(mapping, page);
 
        return ret;
 }
 
 /**
- * truncate_inode_pages - truncate range of pages specified by start and
- * end byte offsets
+ * truncate_inode_pages - truncate range of pages specified by start & end byte offsets
  * @mapping: mapping to truncate
  * @lstart: offset from which to truncate
  * @lend: offset to which to truncate
@@ -189,7 +190,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
                        if (page_index > next)
                                next = page_index;
                        next++;
-                       if (TestSetPageLocked(page))
+                       if (!trylock_page(page))
                                continue;
                        if (PageWriteback(page)) {
                                unlock_page(page);
@@ -282,7 +283,7 @@ unsigned long __invalidate_mapping_pages(struct address_space *mapping,
                        pgoff_t index;
                        int lock_failed;
 
-                       lock_failed = TestSetPageLocked(page);
+                       lock_failed = !trylock_page(page);
 
                        /*
                         * We really shouldn't be looking at the ->index of an
@@ -350,18 +351,18 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
        if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
                return 0;
 
-       write_lock_irq(&mapping->tree_lock);
+       spin_lock_irq(&mapping->tree_lock);
        if (PageDirty(page))
                goto failed;
 
+       clear_page_mlock(page);
        BUG_ON(PagePrivate(page));
        __remove_from_page_cache(page);
-       write_unlock_irq(&mapping->tree_lock);
-       ClearPageUptodate(page);
+       spin_unlock_irq(&mapping->tree_lock);
        page_cache_release(page);       /* pagecache ref */
        return 1;
 failed:
-       write_unlock_irq(&mapping->tree_lock);
+       spin_unlock_irq(&mapping->tree_lock);
        return 0;
 }
 
@@ -383,7 +384,7 @@ static int do_launder_page(struct address_space *mapping, struct page *page)
  * Any pages which are found to be mapped into pagetables are unmapped prior to
  * invalidation.
  *
- * Returns -EIO if any pages could not be invalidated.
+ * Returns -EBUSY if any pages could not be invalidated.
  */
 int invalidate_inode_pages2_range(struct address_space *mapping,
                                  pgoff_t start, pgoff_t end)
@@ -392,6 +393,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
        pgoff_t next;
        int i;
        int ret = 0;
+       int ret2 = 0;
        int did_range_unmap = 0;
        int wrapped = 0;
 
@@ -439,9 +441,13 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
                                }
                        }
                        BUG_ON(page_mapped(page));
-                       ret = do_launder_page(mapping, page);
-                       if (ret == 0 && !invalidate_complete_page2(mapping, page))
-                               ret = -EIO;
+                       ret2 = do_launder_page(mapping, page);
+                       if (ret2 == 0) {
+                               if (!invalidate_complete_page2(mapping, page))
+                                       ret2 = -EBUSY;
+                       }
+                       if (ret2 < 0)
+                               ret = ret2;
                        unlock_page(page);
                }
                pagevec_release(&pvec);