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Diffstat (limited to 'fs/btrfs/extent_io.h')
-rw-r--r--fs/btrfs/extent_io.h16
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index e80c6d96b318..1f9df88afbf6 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -22,6 +22,10 @@
/* flags for bio submission */
#define EXTENT_BIO_COMPRESSED 1
+/* these are bit numbers for test/set bit */
+#define EXTENT_BUFFER_UPTODATE 0
+#define EXTENT_BUFFER_BLOCKING 1
+
/*
* page->private values. Every page that is controlled by the extent
* map has page->private set to one.
@@ -95,11 +99,19 @@ struct extent_buffer {
unsigned long map_start;
unsigned long map_len;
struct page *first_page;
+ unsigned long bflags;
atomic_t refs;
- int flags;
struct list_head leak_list;
struct rb_node rb_node;
- struct mutex mutex;
+
+ /* the spinlock is used to protect most operations */
+ spinlock_t lock;
+
+ /*
+ * when we keep the lock held while blocking, waiters go onto
+ * the wq
+ */
+ wait_queue_head_t lock_wq;
};
struct extent_map_tree;