diff options
Diffstat (limited to 'libdiskfs/diskfs.h')
| -rw-r--r-- | libdiskfs/diskfs.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/libdiskfs/diskfs.h b/libdiskfs/diskfs.h index ae1a1502..2c68aa34 100644 --- a/libdiskfs/diskfs.h +++ b/libdiskfs/diskfs.h @@ -686,6 +686,33 @@ diskfs_notice_filechange (struct node *np, enum file_changed_type type, The new node will have one hard reference and no light references. */ struct node *diskfs_make_node (struct disknode *dn); +/* Create a new node structure. Also allocate SIZE bytes for the + disknode. The address of the disknode can be obtained using + diskfs_node_disknode. The new node will have one hard reference + and no light references. */ +struct node *diskfs_make_node_alloc (size_t size); + +/* To avoid breaking the ABI whenever sizeof (struct node) changes, we + explicitly provide the size. The following two functions will use + this value for offset calculations. */ +extern const size_t _diskfs_sizeof_struct_node; + +/* Return the address of the disknode for NODE. NODE must have been + allocated using diskfs_make_node_alloc. */ +static inline struct disknode * +diskfs_node_disknode (struct node *node) +{ + return (struct disknode *) ((char *) node + _diskfs_sizeof_struct_node); +} + +/* Return the address of the node for DISKNODE. DISKNODE must have + been allocated using diskfs_make_node_alloc. */ +static inline struct node * +diskfs_disknode_node (struct disknode *disknode) +{ + return (struct node *) ((char *) disknode - _diskfs_sizeof_struct_node); +} + /* The library also exports the following functions; they are not generally useful unless you are redefining other functions the library provides. */ |