Btrfs: Add compatibility for kernels >= 2.6.27-rc1

Add a couple of #if's to follow API changes.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5368e3b6eb96..1cf4baba4342 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2649,9 +2649,24 @@ static inline struct page *extent_buffer_page(struct extent_buffer *eb,
         mapping = eb->first_page->mapping;
         if (!mapping)
                 return NULL;
+
+        /*
+         * extent_buffer_page is only called after pinning the page
+         * by increasing the reference count.  So we know the page must
+         * be in the radix tree.
+         */
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
+        rcu_read_lock();
+#else
         read_lock_irq(&mapping->tree_lock);
+#endif
         p = radix_tree_lookup(&mapping->page_tree, i);
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
+        rcu_read_unlock();
+#else
         read_unlock_irq(&mapping->tree_lock);
+#endif
         return p;
 }
 
@@ -2843,13 +2858,21 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
                         }
                 }
                 clear_page_dirty_for_io(page);
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
+                spin_lock_irq(&page->mapping->tree_lock);
+#else
                 read_lock_irq(&page->mapping->tree_lock);
+#endif
                 if (!PageDirty(page)) {
                         radix_tree_tag_clear(&page->mapping->page_tree,
                                                 page_index(page),
                                                 PAGECACHE_TAG_DIRTY);
                 }
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
+                spin_unlock_irq(&page->mapping->tree_lock);
+#else
                 read_unlock_irq(&page->mapping->tree_lock);
+#endif
                 unlock_page(page);
         }
         return 0;