[821] | 1 | /*
|
---|
| 2 | * irel_ma.c
|
---|
| 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 | #include <fcntl.h>
|
---|
| 13 | #include <stdio.h>
|
---|
| 14 | #include <string.h>
|
---|
| 15 | #if HAVE_UNISTD_H
|
---|
| 16 | #include <unistd.h>
|
---|
| 17 | #endif
|
---|
| 18 | #if HAVE_ERRNO_H
|
---|
| 19 | #include <errno.h>
|
---|
| 20 | #endif
|
---|
| 21 |
|
---|
| 22 | #include "ext2_fs.h"
|
---|
| 23 | #include "ext2fs.h"
|
---|
| 24 | #include "irel.h"
|
---|
| 25 |
|
---|
| 26 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
|
---|
| 27 | struct ext2_inode_relocate_entry *ent);
|
---|
| 28 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
|
---|
| 29 | struct ext2_inode_relocate_entry *ent);
|
---|
| 30 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
|
---|
| 31 | struct ext2_inode_relocate_entry *ent);
|
---|
| 32 | static errcode_t ima_start_iter(ext2_irel irel);
|
---|
| 33 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
|
---|
| 34 | struct ext2_inode_relocate_entry *ent);
|
---|
| 35 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
|
---|
| 36 | struct ext2_inode_reference *ref);
|
---|
| 37 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino);
|
---|
| 38 | static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref);
|
---|
| 39 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);
|
---|
| 40 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old);
|
---|
| 41 | static errcode_t ima_free(ext2_irel irel);
|
---|
| 42 |
|
---|
| 43 | /*
|
---|
| 44 | * This data structure stores the array of inode references; there is
|
---|
| 45 | * a structure for each inode.
|
---|
| 46 | */
|
---|
| 47 | struct inode_reference_entry {
|
---|
| 48 | __u16 num;
|
---|
| 49 | struct ext2_inode_reference *refs;
|
---|
| 50 | };
|
---|
| 51 |
|
---|
| 52 | struct irel_ma {
|
---|
| 53 | __u32 magic;
|
---|
| 54 | ext2_ino_t max_inode;
|
---|
| 55 | ext2_ino_t ref_current;
|
---|
| 56 | int ref_iter;
|
---|
| 57 | ext2_ino_t *orig_map;
|
---|
| 58 | struct ext2_inode_relocate_entry *entries;
|
---|
| 59 | struct inode_reference_entry *ref_entries;
|
---|
| 60 | };
|
---|
| 61 |
|
---|
| 62 | errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
|
---|
| 63 | ext2_irel *new_irel)
|
---|
| 64 | {
|
---|
| 65 | ext2_irel irel = 0;
|
---|
| 66 | errcode_t retval;
|
---|
| 67 | struct irel_ma *ma = 0;
|
---|
| 68 | size_t size;
|
---|
| 69 |
|
---|
| 70 | *new_irel = 0;
|
---|
| 71 |
|
---|
| 72 | /*
|
---|
| 73 | * Allocate memory structures
|
---|
| 74 | */
|
---|
| 75 | retval = ext2fs_get_mem(sizeof(struct ext2_inode_relocation_table),
|
---|
| 76 | &irel);
|
---|
| 77 | if (retval)
|
---|
| 78 | goto errout;
|
---|
| 79 | memset(irel, 0, sizeof(struct ext2_inode_relocation_table));
|
---|
| 80 |
|
---|
| 81 | retval = ext2fs_get_mem(strlen(name)+1, &irel->name);
|
---|
| 82 | if (retval)
|
---|
| 83 | goto errout;
|
---|
| 84 | strcpy(irel->name, name);
|
---|
| 85 |
|
---|
| 86 | retval = ext2fs_get_mem(sizeof(struct irel_ma), &ma);
|
---|
| 87 | if (retval)
|
---|
| 88 | goto errout;
|
---|
| 89 | memset(ma, 0, sizeof(struct irel_ma));
|
---|
| 90 | irel->priv_data = ma;
|
---|
| 91 |
|
---|
| 92 | size = (size_t) (sizeof(ext2_ino_t) * (max_inode+1));
|
---|
| 93 | retval = ext2fs_get_mem(size, &ma->orig_map);
|
---|
| 94 | if (retval)
|
---|
| 95 | goto errout;
|
---|
| 96 | memset(ma->orig_map, 0, size);
|
---|
| 97 |
|
---|
| 98 | size = (size_t) (sizeof(struct ext2_inode_relocate_entry) *
|
---|
| 99 | (max_inode+1));
|
---|
| 100 | retval = ext2fs_get_mem(size, &ma->entries);
|
---|
| 101 | if (retval)
|
---|
| 102 | goto errout;
|
---|
| 103 | memset(ma->entries, 0, size);
|
---|
| 104 |
|
---|
| 105 | size = (size_t) (sizeof(struct inode_reference_entry) *
|
---|
| 106 | (max_inode+1));
|
---|
| 107 | retval = ext2fs_get_mem(size, &ma->ref_entries);
|
---|
| 108 | if (retval)
|
---|
| 109 | goto errout;
|
---|
| 110 | memset(ma->ref_entries, 0, size);
|
---|
| 111 | ma->max_inode = max_inode;
|
---|
| 112 |
|
---|
| 113 | /*
|
---|
| 114 | * Fill in the irel data structure
|
---|
| 115 | */
|
---|
| 116 | irel->put = ima_put;
|
---|
| 117 | irel->get = ima_get;
|
---|
| 118 | irel->get_by_orig = ima_get_by_orig;
|
---|
| 119 | irel->start_iter = ima_start_iter;
|
---|
| 120 | irel->next = ima_next;
|
---|
| 121 | irel->add_ref = ima_add_ref;
|
---|
| 122 | irel->start_iter_ref = ima_start_iter_ref;
|
---|
| 123 | irel->next_ref = ima_next_ref;
|
---|
| 124 | irel->move = ima_move;
|
---|
| 125 | irel->delete = ima_delete;
|
---|
| 126 | irel->free = ima_free;
|
---|
| 127 |
|
---|
| 128 | *new_irel = irel;
|
---|
| 129 | return 0;
|
---|
| 130 |
|
---|
| 131 | errout:
|
---|
| 132 | ima_free(irel);
|
---|
| 133 | return retval;
|
---|
| 134 | }
|
---|
| 135 |
|
---|
| 136 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
|
---|
| 137 | struct ext2_inode_relocate_entry *ent)
|
---|
| 138 | {
|
---|
| 139 | struct inode_reference_entry *ref_ent;
|
---|
| 140 | struct irel_ma *ma;
|
---|
| 141 | errcode_t retval;
|
---|
| 142 | size_t size, old_size;
|
---|
| 143 |
|
---|
| 144 | ma = irel->priv_data;
|
---|
| 145 | if (old > ma->max_inode)
|
---|
| 146 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 147 |
|
---|
| 148 | /*
|
---|
| 149 | * Force the orig field to the correct value; the application
|
---|
| 150 | * program shouldn't be messing with this field.
|
---|
| 151 | */
|
---|
| 152 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 153 | ent->orig = old;
|
---|
| 154 | else
|
---|
| 155 | ent->orig = ma->entries[(unsigned) old].orig;
|
---|
| 156 |
|
---|
| 157 | /*
|
---|
| 158 | * If max_refs has changed, reallocate the refs array
|
---|
| 159 | */
|
---|
| 160 | ref_ent = ma->ref_entries + (unsigned) old;
|
---|
| 161 | if (ref_ent->refs && ent->max_refs !=
|
---|
| 162 | ma->entries[(unsigned) old].max_refs) {
|
---|
| 163 | size = (sizeof(struct ext2_inode_reference) * ent->max_refs);
|
---|
| 164 | old_size = (sizeof(struct ext2_inode_reference) *
|
---|
| 165 | ma->entries[(unsigned) old].max_refs);
|
---|
| 166 | retval = ext2fs_resize_mem(old_size, size, &ref_ent->refs);
|
---|
| 167 | if (retval)
|
---|
| 168 | return retval;
|
---|
| 169 | }
|
---|
| 170 |
|
---|
| 171 | ma->entries[(unsigned) old] = *ent;
|
---|
| 172 | ma->orig_map[(unsigned) ent->orig] = old;
|
---|
| 173 | return 0;
|
---|
| 174 | }
|
---|
| 175 |
|
---|
| 176 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
|
---|
| 177 | struct ext2_inode_relocate_entry *ent)
|
---|
| 178 | {
|
---|
| 179 | struct irel_ma *ma;
|
---|
| 180 |
|
---|
| 181 | ma = irel->priv_data;
|
---|
| 182 | if (old > ma->max_inode)
|
---|
| 183 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 184 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 185 | return ENOENT;
|
---|
| 186 | *ent = ma->entries[(unsigned) old];
|
---|
| 187 | return 0;
|
---|
| 188 | }
|
---|
| 189 |
|
---|
| 190 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
|
---|
| 191 | struct ext2_inode_relocate_entry *ent)
|
---|
| 192 | {
|
---|
| 193 | struct irel_ma *ma;
|
---|
| 194 | ext2_ino_t ino;
|
---|
| 195 |
|
---|
| 196 | ma = irel->priv_data;
|
---|
| 197 | if (orig > ma->max_inode)
|
---|
| 198 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 199 | ino = ma->orig_map[(unsigned) orig];
|
---|
| 200 | if (ino == 0)
|
---|
| 201 | return ENOENT;
|
---|
| 202 | *old = ino;
|
---|
| 203 | *ent = ma->entries[(unsigned) ino];
|
---|
| 204 | return 0;
|
---|
| 205 | }
|
---|
| 206 |
|
---|
| 207 | static errcode_t ima_start_iter(ext2_irel irel)
|
---|
| 208 | {
|
---|
| 209 | irel->current = 0;
|
---|
| 210 | return 0;
|
---|
| 211 | }
|
---|
| 212 |
|
---|
| 213 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
|
---|
| 214 | struct ext2_inode_relocate_entry *ent)
|
---|
| 215 | {
|
---|
| 216 | struct irel_ma *ma;
|
---|
| 217 |
|
---|
| 218 | ma = irel->priv_data;
|
---|
| 219 | while (++irel->current < ma->max_inode) {
|
---|
| 220 | if (ma->entries[(unsigned) irel->current].new == 0)
|
---|
| 221 | continue;
|
---|
| 222 | *old = irel->current;
|
---|
| 223 | *ent = ma->entries[(unsigned) irel->current];
|
---|
| 224 | return 0;
|
---|
| 225 | }
|
---|
| 226 | *old = 0;
|
---|
| 227 | return 0;
|
---|
| 228 | }
|
---|
| 229 |
|
---|
| 230 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
|
---|
| 231 | struct ext2_inode_reference *ref)
|
---|
| 232 | {
|
---|
| 233 | struct irel_ma *ma;
|
---|
| 234 | size_t size;
|
---|
| 235 | struct inode_reference_entry *ref_ent;
|
---|
| 236 | struct ext2_inode_relocate_entry *ent;
|
---|
| 237 | errcode_t retval;
|
---|
| 238 |
|
---|
| 239 | ma = irel->priv_data;
|
---|
| 240 | if (ino > ma->max_inode)
|
---|
| 241 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 242 |
|
---|
| 243 | ref_ent = ma->ref_entries + (unsigned) ino;
|
---|
| 244 | ent = ma->entries + (unsigned) ino;
|
---|
| 245 |
|
---|
| 246 | /*
|
---|
| 247 | * If the inode reference array doesn't exist, create it.
|
---|
| 248 | */
|
---|
| 249 | if (ref_ent->refs == 0) {
|
---|
| 250 | size = (size_t) ((sizeof(struct ext2_inode_reference) *
|
---|
| 251 | ent->max_refs));
|
---|
| 252 | retval = ext2fs_get_mem(size, &ref_ent->refs);
|
---|
| 253 | if (retval)
|
---|
| 254 | return retval;
|
---|
| 255 | memset(ref_ent->refs, 0, size);
|
---|
| 256 | ref_ent->num = 0;
|
---|
| 257 | }
|
---|
| 258 |
|
---|
| 259 | if (ref_ent->num >= ent->max_refs)
|
---|
| 260 | return EXT2_ET_TOO_MANY_REFS;
|
---|
| 261 |
|
---|
| 262 | ref_ent->refs[(unsigned) ref_ent->num++] = *ref;
|
---|
| 263 | return 0;
|
---|
| 264 | }
|
---|
| 265 |
|
---|
| 266 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino)
|
---|
| 267 | {
|
---|
| 268 | struct irel_ma *ma;
|
---|
| 269 |
|
---|
| 270 | ma = irel->priv_data;
|
---|
| 271 | if (ino > ma->max_inode)
|
---|
| 272 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 273 | if (ma->entries[(unsigned) ino].new == 0)
|
---|
| 274 | return ENOENT;
|
---|
| 275 | ma->ref_current = ino;
|
---|
| 276 | ma->ref_iter = 0;
|
---|
| 277 | return 0;
|
---|
| 278 | }
|
---|
| 279 |
|
---|
| 280 | static errcode_t ima_next_ref(ext2_irel irel,
|
---|
| 281 | struct ext2_inode_reference *ref)
|
---|
| 282 | {
|
---|
| 283 | struct irel_ma *ma;
|
---|
| 284 | struct inode_reference_entry *ref_ent;
|
---|
| 285 |
|
---|
| 286 | ma = irel->priv_data;
|
---|
| 287 |
|
---|
| 288 | ref_ent = ma->ref_entries + ma->ref_current;
|
---|
| 289 |
|
---|
| 290 | if ((ref_ent->refs == NULL) ||
|
---|
| 291 | (ma->ref_iter >= ref_ent->num)) {
|
---|
| 292 | ref->block = 0;
|
---|
| 293 | ref->offset = 0;
|
---|
| 294 | return 0;
|
---|
| 295 | }
|
---|
| 296 | *ref = ref_ent->refs[ma->ref_iter++];
|
---|
| 297 | return 0;
|
---|
| 298 | }
|
---|
| 299 |
|
---|
| 300 |
|
---|
| 301 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new)
|
---|
| 302 | {
|
---|
| 303 | struct irel_ma *ma;
|
---|
| 304 |
|
---|
| 305 | ma = irel->priv_data;
|
---|
| 306 | if ((old > ma->max_inode) || (new > ma->max_inode))
|
---|
| 307 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 308 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 309 | return ENOENT;
|
---|
| 310 |
|
---|
| 311 | ma->entries[(unsigned) new] = ma->entries[(unsigned) old];
|
---|
| 312 | ext2fs_free_mem(&ma->ref_entries[(unsigned) new].refs);
|
---|
| 313 | ma->ref_entries[(unsigned) new] = ma->ref_entries[(unsigned) old];
|
---|
| 314 |
|
---|
| 315 | ma->entries[(unsigned) old].new = 0;
|
---|
| 316 | ma->ref_entries[(unsigned) old].num = 0;
|
---|
| 317 | ma->ref_entries[(unsigned) old].refs = 0;
|
---|
| 318 |
|
---|
| 319 | ma->orig_map[ma->entries[new].orig] = new;
|
---|
| 320 | return 0;
|
---|
| 321 | }
|
---|
| 322 |
|
---|
| 323 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old)
|
---|
| 324 | {
|
---|
| 325 | struct irel_ma *ma;
|
---|
| 326 |
|
---|
| 327 | ma = irel->priv_data;
|
---|
| 328 | if (old > ma->max_inode)
|
---|
| 329 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 330 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 331 | return ENOENT;
|
---|
| 332 |
|
---|
| 333 | ma->entries[old].new = 0;
|
---|
| 334 | ext2fs_free_mem(&ma->ref_entries[(unsigned) old].refs);
|
---|
| 335 | ma->orig_map[ma->entries[(unsigned) old].orig] = 0;
|
---|
| 336 |
|
---|
| 337 | ma->ref_entries[(unsigned) old].num = 0;
|
---|
| 338 | ma->ref_entries[(unsigned) old].refs = 0;
|
---|
| 339 | return 0;
|
---|
| 340 | }
|
---|
| 341 |
|
---|
| 342 | static errcode_t ima_free(ext2_irel irel)
|
---|
| 343 | {
|
---|
| 344 | struct irel_ma *ma;
|
---|
| 345 | ext2_ino_t ino;
|
---|
| 346 |
|
---|
| 347 | if (!irel)
|
---|
| 348 | return 0;
|
---|
| 349 |
|
---|
| 350 | ma = irel->priv_data;
|
---|
| 351 |
|
---|
| 352 | if (ma) {
|
---|
| 353 | ext2fs_free_mem(&ma->orig_map);
|
---|
| 354 | ext2fs_free_mem(&ma->entries);
|
---|
| 355 | if (ma->ref_entries) {
|
---|
| 356 | for (ino = 0; ino <= ma->max_inode; ino++) {
|
---|
| 357 | ext2fs_free_mem(&ma->ref_entries[(unsigned) ino].refs);
|
---|
| 358 | }
|
---|
| 359 | ext2fs_free_mem(&ma->ref_entries);
|
---|
| 360 | }
|
---|
| 361 | ext2fs_free_mem(&ma);
|
---|
| 362 | }
|
---|
| 363 | ext2fs_free_mem(&irel->name);
|
---|
| 364 | ext2fs_free_mem(&irel);
|
---|
| 365 | return 0;
|
---|
| 366 | }
|
---|