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