Btrfs: switch extent_map to a rw lock

[net-next-2.6.git] / fs / btrfs / extent_map.h

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index abbcbeb28c79d0d910ac922164b8def8a353a8ea..6216dfbcf9be7a195632d733248b1cb766c6139e 100644 (file)
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -11,6 +11,8 @@
 /* bits for the flags field */
 #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
 #define EXTENT_FLAG_COMPRESSED 1
+#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
+#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
 
 struct extent_map {
        struct rb_node rb_node;
@@ -18,6 +20,7 @@ struct extent_map {
        /* all of these are in bytes */
        u64 start;
        u64 len;
+       u64 orig_start;
        u64 block_start;
        u64 block_len;
        unsigned long flags;
@@ -28,7 +31,7 @@ struct extent_map {
 
 struct extent_map_tree {
        struct rb_root map;
-       spinlock_t lock;
+       rwlock_t lock;
 };
 
 static inline u64 extent_map_end(struct extent_map *em)