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>
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 5368e3b..1cf4bab 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2649,9 +2649,24 @@
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 @@
}
}
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;