source: MondoRescue/branches/2.2.9/mindi-busybox/e2fsprogs/old_e2fsprogs/ext2fs/irel.h@ 3320

/* vi: set sw=4 ts=4: */
/*
 * irel.h
 *
 * Copyright (C) 1996, 1997 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

struct ext2_inode_reference {
    blk_t   block;
    __u16 offset;
};

struct ext2_inode_relocate_entry {
    ext2_ino_t  new;
    ext2_ino_t  orig;
    __u16       flags;
    __u16       max_refs;
};

typedef struct ext2_inode_relocation_table *ext2_irel;

struct ext2_inode_relocation_table {
    __u32   magic;
    char    *name;
    ext2_ino_t  current;
    void    *priv_data;

    /*
     * Add an inode relocation entry.
     */
    errcode_t (*put)(ext2_irel irel, ext2_ino_t old,
                  struct ext2_inode_relocate_entry *ent);
    /*
     * Get an inode relocation entry.
     */
    errcode_t (*get)(ext2_irel irel, ext2_ino_t old,
                  struct ext2_inode_relocate_entry *ent);

    /*
     * Get an inode relocation entry by its original inode number
     */
    errcode_t (*get_by_orig)(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
                 struct ext2_inode_relocate_entry *ent);

    /*
     * Initialize for iterating over the inode relocation entries.
     */
    errcode_t (*start_iter)(ext2_irel irel);

    /*
     * The iterator function for the inode relocation entries.
     * Returns an inode number of 0 when out of entries.
     */
    errcode_t (*next)(ext2_irel irel, ext2_ino_t *old,
              struct ext2_inode_relocate_entry *ent);

    /*
     * Add an inode reference (i.e., note the fact that a
     * particular block/offset contains a reference to an inode)
     */
    errcode_t (*add_ref)(ext2_irel irel, ext2_ino_t ino,
                 struct ext2_inode_reference *ref);

    /*
     * Initialize for iterating over the inode references for a
     * particular inode.
     */
    errcode_t (*start_iter_ref)(ext2_irel irel, ext2_ino_t ino);

    /*
     * The iterator function for the inode references for an
     * inode.  The references for only one inode can be interator
     * over at a time, as the iterator state is stored in ext2_irel.
     */
    errcode_t (*next_ref)(ext2_irel irel,
                  struct ext2_inode_reference *ref);

    /*
     * Move the inode relocation table from one inode number to
     * another.  Note that the inode references also must move.
     */
    errcode_t (*move)(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);

    /*
     * Remove an inode relocation entry, along with all of the
     * inode references.
     */
    errcode_t (*delete)(ext2_irel irel, ext2_ino_t old);

    /*
     * Free the inode relocation table.
     */
    errcode_t (*free)(ext2_irel irel);
};

errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
                    ext2_irel *irel);

#define ext2fs_irel_put(irel, old, ent) ((irel)->put((irel), old, ent))
#define ext2fs_irel_get(irel, old, ent) ((irel)->get((irel), old, ent))
#define ext2fs_irel_get_by_orig(irel, orig, old, ent) \
            ((irel)->get_by_orig((irel), orig, old, ent))
#define ext2fs_irel_start_iter(irel) ((irel)->start_iter((irel)))
#define ext2fs_irel_next(irel, old, ent) ((irel)->next((irel), old, ent))
#define ext2fs_irel_add_ref(irel, ino, ref) ((irel)->add_ref((irel), ino, ref))
#define ext2fs_irel_start_iter_ref(irel, ino) ((irel)->start_iter_ref((irel), ino))
#define ext2fs_irel_next_ref(irel, ref) ((irel)->next_ref((irel), ref))
#define ext2fs_irel_move(irel, old, new) ((irel)->move((irel), old, new))
#define ext2fs_irel_delete(irel, old) ((irel)->delete((irel), old))
#define ext2fs_irel_free(irel) ((irel)->free((irel)))