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      1 /*
      2  * irel.h
      3  *
      4  * Copyright (C) 1996, 1997 Theodore Ts'o.
      5  *
      6  * %Begin-Header%
      7  * This file may be redistributed under the terms of the GNU Library
      8  * General Public License, version 2.
      9  * %End-Header%
     10  */
     11 
     12 struct ext2_inode_reference {
     13 	blk_t	block;
     14 	__u16 offset;
     15 };
     16 
     17 struct ext2_inode_relocate_entry {
     18 	ext2_ino_t	new;
     19 	ext2_ino_t	orig;
     20 	__u16		flags;
     21 	__u16		max_refs;
     22 };
     23 
     24 typedef struct ext2_inode_relocation_table *ext2_irel;
     25 
     26 struct ext2_inode_relocation_table {
     27 	__u32	magic;
     28 	char	*name;
     29 	ext2_ino_t	current;
     30 	void	*priv_data;
     31 
     32 	/*
     33 	 * Add an inode relocation entry.
     34 	 */
     35 	errcode_t (*put)(ext2_irel irel, ext2_ino_t old,
     36 			      struct ext2_inode_relocate_entry *ent);
     37 	/*
     38 	 * Get an inode relocation entry.
     39 	 */
     40 	errcode_t (*get)(ext2_irel irel, ext2_ino_t old,
     41 			      struct ext2_inode_relocate_entry *ent);
     42 
     43 	/*
     44 	 * Get an inode relocation entry by its original inode number
     45 	 */
     46 	errcode_t (*get_by_orig)(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
     47 				 struct ext2_inode_relocate_entry *ent);
     48 
     49 	/*
     50 	 * Initialize for iterating over the inode relocation entries.
     51 	 */
     52 	errcode_t (*start_iter)(ext2_irel irel);
     53 
     54 	/*
     55 	 * The iterator function for the inode relocation entries.
     56 	 * Returns an inode number of 0 when out of entries.
     57 	 */
     58 	errcode_t (*next)(ext2_irel irel, ext2_ino_t *old,
     59 			  struct ext2_inode_relocate_entry *ent);
     60 
     61 	/*
     62 	 * Add an inode reference (i.e., note the fact that a
     63 	 * particular block/offset contains a reference to an inode)
     64 	 */
     65 	errcode_t (*add_ref)(ext2_irel irel, ext2_ino_t ino,
     66 			     struct ext2_inode_reference *ref);
     67 
     68 	/*
     69 	 * Initialize for iterating over the inode references for a
     70 	 * particular inode.
     71 	 */
     72 	errcode_t (*start_iter_ref)(ext2_irel irel, ext2_ino_t ino);
     73 
     74 	/*
     75 	 * The iterator function for the inode references for an
     76 	 * inode.  The references for only one inode can be interator
     77 	 * over at a time, as the iterator state is stored in ext2_irel.
     78 	 */
     79 	errcode_t (*next_ref)(ext2_irel irel,
     80 			      struct ext2_inode_reference *ref);
     81 
     82 	/*
     83 	 * Move the inode relocation table from one inode number to
     84 	 * another.  Note that the inode references also must move.
     85 	 */
     86 	errcode_t (*move)(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);
     87 
     88 	/*
     89 	 * Remove an inode relocation entry, along with all of the
     90 	 * inode references.
     91 	 */
     92 	errcode_t (*delete)(ext2_irel irel, ext2_ino_t old);
     93 
     94 	/*
     95 	 * Free the inode relocation table.
     96 	 */
     97 	errcode_t (*free)(ext2_irel irel);
     98 };
     99 
    100 errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
    101 				    ext2_irel *irel);
    102 
    103 #define ext2fs_irel_put(irel, old, ent) ((irel)->put((irel), old, ent))
    104 #define ext2fs_irel_get(irel, old, ent) ((irel)->get((irel), old, ent))
    105 #define ext2fs_irel_get_by_orig(irel, orig, old, ent) \
    106 			((irel)->get_by_orig((irel), orig, old, ent))
    107 #define ext2fs_irel_start_iter(irel) ((irel)->start_iter((irel)))
    108 #define ext2fs_irel_next(irel, old, ent) ((irel)->next((irel), old, ent))
    109 #define ext2fs_irel_add_ref(irel, ino, ref) ((irel)->add_ref((irel), ino, ref))
    110 #define ext2fs_irel_start_iter_ref(irel, ino) ((irel)->start_iter_ref((irel), ino))
    111 #define ext2fs_irel_next_ref(irel, ref) ((irel)->next_ref((irel), ref))
    112 #define ext2fs_irel_move(irel, old, new) ((irel)->move((irel), old, new))
    113 #define ext2fs_irel_delete(irel, old) ((irel)->delete((irel), old))
    114 #define ext2fs_irel_free(irel) ((irel)->free((irel)))
    115