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-rw-r--r--mm/truncate.c54
1 files changed, 51 insertions, 3 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 2e84fe59190b..0db9258319f0 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -35,7 +35,8 @@ static void clear_exceptional_entry(struct address_space *mapping,
* without the tree itself locked. These unlocked entries
* need verification under the tree lock.
*/
- radix_tree_delete_item(&mapping->page_tree, index, entry);
+ if (radix_tree_delete_item(&mapping->page_tree, index, entry) == entry)
+ mapping->nrshadows--;
spin_unlock_irq(&mapping->tree_lock);
}
@@ -229,7 +230,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
int i;
cleancache_invalidate_inode(mapping);
- if (mapping->nrpages == 0)
+ if (mapping->nrpages == 0 && mapping->nrshadows == 0)
return;
/* Offsets within partial pages */
@@ -392,6 +393,53 @@ void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
EXPORT_SYMBOL(truncate_inode_pages);
/**
+ * truncate_inode_pages_final - truncate *all* pages before inode dies
+ * @mapping: mapping to truncate
+ *
+ * Called under (and serialized by) inode->i_mutex.
+ *
+ * Filesystems have to use this in the .evict_inode path to inform the
+ * VM that this is the final truncate and the inode is going away.
+ */
+void truncate_inode_pages_final(struct address_space *mapping)
+{
+ unsigned long nrshadows;
+ unsigned long nrpages;
+
+ /*
+ * Page reclaim can not participate in regular inode lifetime
+ * management (can't call iput()) and thus can race with the
+ * inode teardown. Tell it when the address space is exiting,
+ * so that it does not install eviction information after the
+ * final truncate has begun.
+ */
+ mapping_set_exiting(mapping);
+
+ /*
+ * When reclaim installs eviction entries, it increases
+ * nrshadows first, then decreases nrpages. Make sure we see
+ * this in the right order or we might miss an entry.
+ */
+ nrpages = mapping->nrpages;
+ smp_rmb();
+ nrshadows = mapping->nrshadows;
+
+ if (nrpages || nrshadows) {
+ /*
+ * As truncation uses a lockless tree lookup, cycle
+ * the tree lock to make sure any ongoing tree
+ * modification that does not see AS_EXITING is
+ * completed before starting the final truncate.
+ */
+ spin_lock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
+
+ truncate_inode_pages(mapping, 0);
+ }
+}
+EXPORT_SYMBOL(truncate_inode_pages_final);
+
+/**
* 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
@@ -484,7 +532,7 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
goto failed;
BUG_ON(page_has_private(page));
- __delete_from_page_cache(page);
+ __delete_from_page_cache(page, NULL);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);

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