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 Public 8 * License. 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