Fixes for loopback files in btrfs

[deliverable/linux.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index fd58dd846e61ec66260e274231d1f831f8dd5975..052555ced44d91425b6657359a88cacc368b4aae 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -37,11 +37,12 @@ extern struct kmem_cache *btrfs_path_cachep;
 
 #define BTRFS_MAGIC "_B2RfS_M"
 
+#define BTRFS_MAX_LEVEL 8
 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
 #define BTRFS_FS_TREE_OBJECTID 3ULL
 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
-#define BTRFS_FIRST_FREE_OBJECTID 5ULL
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
 
 /*
  * we can actually store much bigger names, but lets not confuse the rest
@@ -53,7 +54,7 @@ extern struct kmem_cache *btrfs_path_cachep;
 #define BTRFS_CSUM_SIZE 32
 /* four bytes for CRC32 */
 #define BTRFS_CRC32_SIZE 4
-#define BTRFS_EMPTY_DIR_SIZE 6
+#define BTRFS_EMPTY_DIR_SIZE 0
 
 #define BTRFS_FT_UNKNOWN       0
 #define BTRFS_FT_REG_FILE      1
@@ -107,7 +108,6 @@ struct btrfs_header {
        u8 level;
 } __attribute__ ((__packed__));
 
-#define BTRFS_MAX_LEVEL 8
 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
                                sizeof(struct btrfs_header)) / \
                                sizeof(struct btrfs_key_ptr))
@@ -206,6 +206,11 @@ struct btrfs_extent_ref {
        __le64 offset;
 } __attribute__ ((__packed__));
 
+struct btrfs_inode_ref {
+       __le16 name_len;
+       /* name goes here */
+} __attribute__ ((__packed__));
+
 struct btrfs_inode_timespec {
        __le64 sec;
        __le32 nsec;
@@ -379,7 +384,8 @@ struct btrfs_root {
  * the FS
  */
 #define BTRFS_INODE_ITEM_KEY           1
-#define BTRFS_XATTR_ITEM_KEY           2
+#define BTRFS_INODE_REF_KEY            2
+#define BTRFS_XATTR_ITEM_KEY           8
 /* reserve 2-15 close to the inode for later flexibility */
 
 /*
@@ -486,6 +492,9 @@ BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
                         used, 64);
 
+/* struct btrfs_inode_ref */
+BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+
 /* struct btrfs_inode_item */
 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
@@ -544,11 +553,12 @@ BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
 
-BTRFS_SETGET_STACK_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
-BTRFS_SETGET_STACK_FUNCS(ref_generation, struct btrfs_extent_ref,
+BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
                         generation, 64);
-BTRFS_SETGET_STACK_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
-BTRFS_SETGET_STACK_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
+                        objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
 
 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
                         refs, 32);
@@ -914,24 +924,45 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
                                                 *hint, u64 search_start,
                                                 int data, int owner);
 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
-                      struct btrfs_root *root);
+                      struct btrfs_root *root, u64 owner_objectid);
 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                                            struct btrfs_root *root, u32 size,
+                                           u64 root_objectid,
                                            u64 hint, u64 empty_size);
+struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
+                                            struct btrfs_root *root,
+                                            u32 blocksize,
+                                            u64 root_objectid,
+                                            u64 ref_generation,
+                                            u64 first_objectid,
+                                            int level,
+                                            u64 hint,
+                                            u64 empty_size);
+int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
+                                struct btrfs_root *root,
+                                struct btrfs_path *path, u64 bytenr,
+                                u64 root_objectid, u64 ref_generation,
+                                u64 owner, u64 owner_offset);
 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
-                      struct btrfs_root *root, u64 owner,
-                      u64 num_bytes, u64 empty_size, u64 search_start,
+                      struct btrfs_root *root,
+                      u64 num_bytes, u64 root_objectid, u64 ref_generation,
+                      u64 owner, u64 owner_offset,
+                      u64 empty_size, u64 hint_byte,
                       u64 search_end, struct btrfs_key *ins, int data);
 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                  struct extent_buffer *buf);
 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
-                     *root, u64 bytenr, u64 num_bytes, int pin);
+                     *root, u64 bytenr, u64 num_bytes,
+                     u64 root_objectid, u64 ref_generation,
+                     u64 owner_objectid, u64 owner_offset, int pin);
 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
                               struct btrfs_root *root,
                               struct extent_map_tree *unpin);
 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
-                               u64 bytenr, u64 num_bytes);
+                               u64 bytenr, u64 num_bytes,
+                               u64 root_objectid, u64 ref_generation,
+                               u64 owner, u64 owner_offset);
 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
                                    struct btrfs_root *root);
 int btrfs_free_block_groups(struct btrfs_fs_info *info);
@@ -966,6 +997,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
                            *root, struct btrfs_path *path, struct btrfs_key
                            *cpu_key, u32 data_size);
 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
                        *root);
@@ -1020,6 +1052,14 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
 
 /* inode-item.c */
+int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *root,
+                          const char *name, int name_len,
+                          u64 inode_objectid, u64 ref_objectid);
+int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *root,
+                          const char *name, int name_len,
+                          u64 inode_objectid, u64 ref_objectid);
 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
                             struct btrfs_root *root,
                             struct btrfs_path *path, u64 objectid);