[1765] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * irel_ma.c
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 1996, 1997 Theodore Ts'o.
|
---|
| 6 | *
|
---|
| 7 | * %Begin-Header%
|
---|
| 8 | * This file may be redistributed under the terms of the GNU Public
|
---|
| 9 | * License.
|
---|
| 10 | * %End-Header%
|
---|
| 11 | */
|
---|
| 12 |
|
---|
| 13 | #include <fcntl.h>
|
---|
| 14 | #include <stdio.h>
|
---|
| 15 | #include <string.h>
|
---|
| 16 | #if HAVE_UNISTD_H
|
---|
| 17 | #include <unistd.h>
|
---|
| 18 | #endif
|
---|
| 19 | #if HAVE_ERRNO_H
|
---|
| 20 | #include <errno.h>
|
---|
| 21 | #endif
|
---|
| 22 |
|
---|
| 23 | #include "ext2_fs.h"
|
---|
| 24 | #include "ext2fs.h"
|
---|
| 25 | #include "irel.h"
|
---|
| 26 |
|
---|
| 27 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
|
---|
| 28 | struct ext2_inode_relocate_entry *ent);
|
---|
| 29 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
|
---|
| 30 | struct ext2_inode_relocate_entry *ent);
|
---|
| 31 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
|
---|
| 32 | struct ext2_inode_relocate_entry *ent);
|
---|
| 33 | static errcode_t ima_start_iter(ext2_irel irel);
|
---|
| 34 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
|
---|
| 35 | struct ext2_inode_relocate_entry *ent);
|
---|
| 36 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
|
---|
| 37 | struct ext2_inode_reference *ref);
|
---|
| 38 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino);
|
---|
| 39 | static errcode_t ima_next_ref(ext2_irel irel, struct ext2_inode_reference *ref);
|
---|
| 40 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new);
|
---|
| 41 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old);
|
---|
| 42 | static errcode_t ima_free(ext2_irel irel);
|
---|
| 43 |
|
---|
| 44 | /*
|
---|
| 45 | * This data structure stores the array of inode references; there is
|
---|
| 46 | * a structure for each inode.
|
---|
| 47 | */
|
---|
| 48 | struct inode_reference_entry {
|
---|
| 49 | __u16 num;
|
---|
| 50 | struct ext2_inode_reference *refs;
|
---|
| 51 | };
|
---|
| 52 |
|
---|
| 53 | struct irel_ma {
|
---|
| 54 | __u32 magic;
|
---|
| 55 | ext2_ino_t max_inode;
|
---|
| 56 | ext2_ino_t ref_current;
|
---|
| 57 | int ref_iter;
|
---|
| 58 | ext2_ino_t *orig_map;
|
---|
| 59 | struct ext2_inode_relocate_entry *entries;
|
---|
| 60 | struct inode_reference_entry *ref_entries;
|
---|
| 61 | };
|
---|
| 62 |
|
---|
| 63 | errcode_t ext2fs_irel_memarray_create(char *name, ext2_ino_t max_inode,
|
---|
| 64 | ext2_irel *new_irel)
|
---|
| 65 | {
|
---|
| 66 | ext2_irel irel = 0;
|
---|
| 67 | errcode_t retval;
|
---|
| 68 | struct irel_ma *ma = 0;
|
---|
| 69 | size_t size;
|
---|
| 70 |
|
---|
| 71 | *new_irel = 0;
|
---|
| 72 |
|
---|
| 73 | /*
|
---|
| 74 | * Allocate memory structures
|
---|
| 75 | */
|
---|
| 76 | retval = ext2fs_get_mem(sizeof(struct ext2_inode_relocation_table),
|
---|
| 77 | &irel);
|
---|
| 78 | if (retval)
|
---|
| 79 | goto errout;
|
---|
| 80 | memset(irel, 0, sizeof(struct ext2_inode_relocation_table));
|
---|
| 81 |
|
---|
| 82 | retval = ext2fs_get_mem(strlen(name)+1, &irel->name);
|
---|
| 83 | if (retval)
|
---|
| 84 | goto errout;
|
---|
| 85 | strcpy(irel->name, name);
|
---|
| 86 |
|
---|
| 87 | retval = ext2fs_get_mem(sizeof(struct irel_ma), &ma);
|
---|
| 88 | if (retval)
|
---|
| 89 | goto errout;
|
---|
| 90 | memset(ma, 0, sizeof(struct irel_ma));
|
---|
| 91 | irel->priv_data = ma;
|
---|
| 92 |
|
---|
| 93 | size = (size_t) (sizeof(ext2_ino_t) * (max_inode+1));
|
---|
| 94 | retval = ext2fs_get_mem(size, &ma->orig_map);
|
---|
| 95 | if (retval)
|
---|
| 96 | goto errout;
|
---|
| 97 | memset(ma->orig_map, 0, size);
|
---|
| 98 |
|
---|
| 99 | size = (size_t) (sizeof(struct ext2_inode_relocate_entry) *
|
---|
| 100 | (max_inode+1));
|
---|
| 101 | retval = ext2fs_get_mem(size, &ma->entries);
|
---|
| 102 | if (retval)
|
---|
| 103 | goto errout;
|
---|
| 104 | memset(ma->entries, 0, size);
|
---|
| 105 |
|
---|
| 106 | size = (size_t) (sizeof(struct inode_reference_entry) *
|
---|
| 107 | (max_inode+1));
|
---|
| 108 | retval = ext2fs_get_mem(size, &ma->ref_entries);
|
---|
| 109 | if (retval)
|
---|
| 110 | goto errout;
|
---|
| 111 | memset(ma->ref_entries, 0, size);
|
---|
| 112 | ma->max_inode = max_inode;
|
---|
| 113 |
|
---|
| 114 | /*
|
---|
| 115 | * Fill in the irel data structure
|
---|
| 116 | */
|
---|
| 117 | irel->put = ima_put;
|
---|
| 118 | irel->get = ima_get;
|
---|
| 119 | irel->get_by_orig = ima_get_by_orig;
|
---|
| 120 | irel->start_iter = ima_start_iter;
|
---|
| 121 | irel->next = ima_next;
|
---|
| 122 | irel->add_ref = ima_add_ref;
|
---|
| 123 | irel->start_iter_ref = ima_start_iter_ref;
|
---|
| 124 | irel->next_ref = ima_next_ref;
|
---|
| 125 | irel->move = ima_move;
|
---|
| 126 | irel->delete = ima_delete;
|
---|
| 127 | irel->free = ima_free;
|
---|
| 128 |
|
---|
| 129 | *new_irel = irel;
|
---|
| 130 | return 0;
|
---|
| 131 |
|
---|
| 132 | errout:
|
---|
| 133 | ima_free(irel);
|
---|
| 134 | return retval;
|
---|
| 135 | }
|
---|
| 136 |
|
---|
| 137 | static errcode_t ima_put(ext2_irel irel, ext2_ino_t old,
|
---|
| 138 | struct ext2_inode_relocate_entry *ent)
|
---|
| 139 | {
|
---|
| 140 | struct inode_reference_entry *ref_ent;
|
---|
| 141 | struct irel_ma *ma;
|
---|
| 142 | errcode_t retval;
|
---|
| 143 | size_t size, old_size;
|
---|
| 144 |
|
---|
| 145 | ma = irel->priv_data;
|
---|
| 146 | if (old > ma->max_inode)
|
---|
| 147 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 148 |
|
---|
| 149 | /*
|
---|
| 150 | * Force the orig field to the correct value; the application
|
---|
| 151 | * program shouldn't be messing with this field.
|
---|
| 152 | */
|
---|
| 153 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 154 | ent->orig = old;
|
---|
| 155 | else
|
---|
| 156 | ent->orig = ma->entries[(unsigned) old].orig;
|
---|
| 157 |
|
---|
| 158 | /*
|
---|
| 159 | * If max_refs has changed, reallocate the refs array
|
---|
| 160 | */
|
---|
| 161 | ref_ent = ma->ref_entries + (unsigned) old;
|
---|
| 162 | if (ref_ent->refs && ent->max_refs !=
|
---|
| 163 | ma->entries[(unsigned) old].max_refs) {
|
---|
| 164 | size = (sizeof(struct ext2_inode_reference) * ent->max_refs);
|
---|
| 165 | old_size = (sizeof(struct ext2_inode_reference) *
|
---|
| 166 | ma->entries[(unsigned) old].max_refs);
|
---|
| 167 | retval = ext2fs_resize_mem(old_size, size, &ref_ent->refs);
|
---|
| 168 | if (retval)
|
---|
| 169 | return retval;
|
---|
| 170 | }
|
---|
| 171 |
|
---|
| 172 | ma->entries[(unsigned) old] = *ent;
|
---|
| 173 | ma->orig_map[(unsigned) ent->orig] = old;
|
---|
| 174 | return 0;
|
---|
| 175 | }
|
---|
| 176 |
|
---|
| 177 | static errcode_t ima_get(ext2_irel irel, ext2_ino_t old,
|
---|
| 178 | struct ext2_inode_relocate_entry *ent)
|
---|
| 179 | {
|
---|
| 180 | struct irel_ma *ma;
|
---|
| 181 |
|
---|
| 182 | ma = irel->priv_data;
|
---|
| 183 | if (old > ma->max_inode)
|
---|
| 184 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 185 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 186 | return ENOENT;
|
---|
| 187 | *ent = ma->entries[(unsigned) old];
|
---|
| 188 | return 0;
|
---|
| 189 | }
|
---|
| 190 |
|
---|
| 191 | static errcode_t ima_get_by_orig(ext2_irel irel, ext2_ino_t orig, ext2_ino_t *old,
|
---|
| 192 | struct ext2_inode_relocate_entry *ent)
|
---|
| 193 | {
|
---|
| 194 | struct irel_ma *ma;
|
---|
| 195 | ext2_ino_t ino;
|
---|
| 196 |
|
---|
| 197 | ma = irel->priv_data;
|
---|
| 198 | if (orig > ma->max_inode)
|
---|
| 199 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 200 | ino = ma->orig_map[(unsigned) orig];
|
---|
| 201 | if (ino == 0)
|
---|
| 202 | return ENOENT;
|
---|
| 203 | *old = ino;
|
---|
| 204 | *ent = ma->entries[(unsigned) ino];
|
---|
| 205 | return 0;
|
---|
| 206 | }
|
---|
| 207 |
|
---|
| 208 | static errcode_t ima_start_iter(ext2_irel irel)
|
---|
| 209 | {
|
---|
| 210 | irel->current = 0;
|
---|
| 211 | return 0;
|
---|
| 212 | }
|
---|
| 213 |
|
---|
| 214 | static errcode_t ima_next(ext2_irel irel, ext2_ino_t *old,
|
---|
| 215 | struct ext2_inode_relocate_entry *ent)
|
---|
| 216 | {
|
---|
| 217 | struct irel_ma *ma;
|
---|
| 218 |
|
---|
| 219 | ma = irel->priv_data;
|
---|
| 220 | while (++irel->current < ma->max_inode) {
|
---|
| 221 | if (ma->entries[(unsigned) irel->current].new == 0)
|
---|
| 222 | continue;
|
---|
| 223 | *old = irel->current;
|
---|
| 224 | *ent = ma->entries[(unsigned) irel->current];
|
---|
| 225 | return 0;
|
---|
| 226 | }
|
---|
| 227 | *old = 0;
|
---|
| 228 | return 0;
|
---|
| 229 | }
|
---|
| 230 |
|
---|
| 231 | static errcode_t ima_add_ref(ext2_irel irel, ext2_ino_t ino,
|
---|
| 232 | struct ext2_inode_reference *ref)
|
---|
| 233 | {
|
---|
| 234 | struct irel_ma *ma;
|
---|
| 235 | size_t size;
|
---|
| 236 | struct inode_reference_entry *ref_ent;
|
---|
| 237 | struct ext2_inode_relocate_entry *ent;
|
---|
| 238 | errcode_t retval;
|
---|
| 239 |
|
---|
| 240 | ma = irel->priv_data;
|
---|
| 241 | if (ino > ma->max_inode)
|
---|
| 242 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 243 |
|
---|
| 244 | ref_ent = ma->ref_entries + (unsigned) ino;
|
---|
| 245 | ent = ma->entries + (unsigned) ino;
|
---|
| 246 |
|
---|
| 247 | /*
|
---|
| 248 | * If the inode reference array doesn't exist, create it.
|
---|
| 249 | */
|
---|
| 250 | if (ref_ent->refs == 0) {
|
---|
| 251 | size = (size_t) ((sizeof(struct ext2_inode_reference) *
|
---|
| 252 | ent->max_refs));
|
---|
| 253 | retval = ext2fs_get_mem(size, &ref_ent->refs);
|
---|
| 254 | if (retval)
|
---|
| 255 | return retval;
|
---|
| 256 | memset(ref_ent->refs, 0, size);
|
---|
| 257 | ref_ent->num = 0;
|
---|
| 258 | }
|
---|
| 259 |
|
---|
| 260 | if (ref_ent->num >= ent->max_refs)
|
---|
| 261 | return EXT2_ET_TOO_MANY_REFS;
|
---|
| 262 |
|
---|
| 263 | ref_ent->refs[(unsigned) ref_ent->num++] = *ref;
|
---|
| 264 | return 0;
|
---|
| 265 | }
|
---|
| 266 |
|
---|
| 267 | static errcode_t ima_start_iter_ref(ext2_irel irel, ext2_ino_t ino)
|
---|
| 268 | {
|
---|
| 269 | struct irel_ma *ma;
|
---|
| 270 |
|
---|
| 271 | ma = irel->priv_data;
|
---|
| 272 | if (ino > ma->max_inode)
|
---|
| 273 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 274 | if (ma->entries[(unsigned) ino].new == 0)
|
---|
| 275 | return ENOENT;
|
---|
| 276 | ma->ref_current = ino;
|
---|
| 277 | ma->ref_iter = 0;
|
---|
| 278 | return 0;
|
---|
| 279 | }
|
---|
| 280 |
|
---|
| 281 | static errcode_t ima_next_ref(ext2_irel irel,
|
---|
| 282 | struct ext2_inode_reference *ref)
|
---|
| 283 | {
|
---|
| 284 | struct irel_ma *ma;
|
---|
| 285 | struct inode_reference_entry *ref_ent;
|
---|
| 286 |
|
---|
| 287 | ma = irel->priv_data;
|
---|
| 288 |
|
---|
| 289 | ref_ent = ma->ref_entries + ma->ref_current;
|
---|
| 290 |
|
---|
| 291 | if ((ref_ent->refs == NULL) ||
|
---|
| 292 | (ma->ref_iter >= ref_ent->num)) {
|
---|
| 293 | ref->block = 0;
|
---|
| 294 | ref->offset = 0;
|
---|
| 295 | return 0;
|
---|
| 296 | }
|
---|
| 297 | *ref = ref_ent->refs[ma->ref_iter++];
|
---|
| 298 | return 0;
|
---|
| 299 | }
|
---|
| 300 |
|
---|
| 301 |
|
---|
| 302 | static errcode_t ima_move(ext2_irel irel, ext2_ino_t old, ext2_ino_t new)
|
---|
| 303 | {
|
---|
| 304 | struct irel_ma *ma;
|
---|
| 305 |
|
---|
| 306 | ma = irel->priv_data;
|
---|
| 307 | if ((old > ma->max_inode) || (new > ma->max_inode))
|
---|
| 308 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 309 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 310 | return ENOENT;
|
---|
| 311 |
|
---|
| 312 | ma->entries[(unsigned) new] = ma->entries[(unsigned) old];
|
---|
| 313 | ext2fs_free_mem(&ma->ref_entries[(unsigned) new].refs);
|
---|
| 314 | ma->ref_entries[(unsigned) new] = ma->ref_entries[(unsigned) old];
|
---|
| 315 |
|
---|
| 316 | ma->entries[(unsigned) old].new = 0;
|
---|
| 317 | ma->ref_entries[(unsigned) old].num = 0;
|
---|
| 318 | ma->ref_entries[(unsigned) old].refs = 0;
|
---|
| 319 |
|
---|
| 320 | ma->orig_map[ma->entries[new].orig] = new;
|
---|
| 321 | return 0;
|
---|
| 322 | }
|
---|
| 323 |
|
---|
| 324 | static errcode_t ima_delete(ext2_irel irel, ext2_ino_t old)
|
---|
| 325 | {
|
---|
| 326 | struct irel_ma *ma;
|
---|
| 327 |
|
---|
| 328 | ma = irel->priv_data;
|
---|
| 329 | if (old > ma->max_inode)
|
---|
| 330 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 331 | if (ma->entries[(unsigned) old].new == 0)
|
---|
| 332 | return ENOENT;
|
---|
| 333 |
|
---|
| 334 | ma->entries[old].new = 0;
|
---|
| 335 | ext2fs_free_mem(&ma->ref_entries[(unsigned) old].refs);
|
---|
| 336 | ma->orig_map[ma->entries[(unsigned) old].orig] = 0;
|
---|
| 337 |
|
---|
| 338 | ma->ref_entries[(unsigned) old].num = 0;
|
---|
| 339 | ma->ref_entries[(unsigned) old].refs = 0;
|
---|
| 340 | return 0;
|
---|
| 341 | }
|
---|
| 342 |
|
---|
| 343 | static errcode_t ima_free(ext2_irel irel)
|
---|
| 344 | {
|
---|
| 345 | struct irel_ma *ma;
|
---|
| 346 | ext2_ino_t ino;
|
---|
| 347 |
|
---|
| 348 | if (!irel)
|
---|
| 349 | return 0;
|
---|
| 350 |
|
---|
| 351 | ma = irel->priv_data;
|
---|
| 352 |
|
---|
| 353 | if (ma) {
|
---|
| 354 | ext2fs_free_mem(&ma->orig_map);
|
---|
| 355 | ext2fs_free_mem(&ma->entries);
|
---|
| 356 | if (ma->ref_entries) {
|
---|
| 357 | for (ino = 0; ino <= ma->max_inode; ino++) {
|
---|
| 358 | ext2fs_free_mem(&ma->ref_entries[(unsigned) ino].refs);
|
---|
| 359 | }
|
---|
| 360 | ext2fs_free_mem(&ma->ref_entries);
|
---|
| 361 | }
|
---|
| 362 | ext2fs_free_mem(&ma);
|
---|
| 363 | }
|
---|
| 364 | ext2fs_free_mem(&irel->name);
|
---|
| 365 | ext2fs_free_mem(&irel);
|
---|
| 366 | return 0;
|
---|
| 367 | }
|
---|