1 /* 2 * mkquota.c --- create quota files for a filesystem 3 * 4 * Aditya Kali <adityakali (at) google.com> 5 */ 6 #include <sys/types.h> 7 #include <sys/stat.h> 8 #include <unistd.h> 9 #include <errno.h> 10 #include <string.h> 11 #include <fcntl.h> 12 13 #include "ext2fs/ext2_fs.h" 14 #include "ext2fs/ext2fs.h" 15 #include "e2p/e2p.h" 16 17 #include "quotaio.h" 18 #include "quotaio_v2.h" 19 #include "quotaio_tree.h" 20 #include "mkquota.h" 21 #include "common.h" 22 23 /* Needed for architectures where sizeof(int) != sizeof(void *) */ 24 #define UINT_TO_VOIDPTR(val) ((void *)(intptr_t)(val)) 25 #define VOIDPTR_TO_UINT(ptr) ((unsigned int)(intptr_t)(ptr)) 26 27 #if DEBUG_QUOTA 28 static void print_inode(struct ext2_inode *inode) 29 { 30 if (!inode) 31 return; 32 33 fprintf(stderr, " i_mode = %d\n", inode->i_mode); 34 fprintf(stderr, " i_uid = %d\n", inode->i_uid); 35 fprintf(stderr, " i_size = %d\n", inode->i_size); 36 fprintf(stderr, " i_atime = %d\n", inode->i_atime); 37 fprintf(stderr, " i_ctime = %d\n", inode->i_ctime); 38 fprintf(stderr, " i_mtime = %d\n", inode->i_mtime); 39 fprintf(stderr, " i_dtime = %d\n", inode->i_dtime); 40 fprintf(stderr, " i_gid = %d\n", inode->i_gid); 41 fprintf(stderr, " i_links_count = %d\n", inode->i_links_count); 42 fprintf(stderr, " i_blocks = %d\n", inode->i_blocks); 43 fprintf(stderr, " i_flags = %d\n", inode->i_flags); 44 45 return; 46 } 47 #endif 48 49 /* 50 * Returns 0 if not able to find the quota file, otherwise returns its 51 * inode number. 52 */ 53 int quota_file_exists(ext2_filsys fs, int qtype, int fmt) 54 { 55 char qf_name[256]; 56 errcode_t ret; 57 ext2_ino_t ino; 58 59 if (qtype >= MAXQUOTAS) 60 return -EINVAL; 61 62 quota_get_qf_name(qtype, QFMT_VFS_V1, qf_name); 63 64 ret = ext2fs_lookup(fs, EXT2_ROOT_INO, qf_name, strlen(qf_name), 0, 65 &ino); 66 if (ret) 67 return 0; 68 69 return ino; 70 } 71 72 /* 73 * Set the value for reserved quota inode number field in superblock. 74 */ 75 void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, int qtype) 76 { 77 ext2_ino_t *inump; 78 79 inump = (qtype == USRQUOTA) ? &fs->super->s_usr_quota_inum : 80 &fs->super->s_grp_quota_inum; 81 82 log_debug("setting quota ino in superblock: ino=%u, type=%d", ino, 83 qtype); 84 *inump = ino; 85 ext2fs_mark_super_dirty(fs); 86 } 87 88 errcode_t quota_remove_inode(ext2_filsys fs, int qtype) 89 { 90 ext2_ino_t qf_ino; 91 92 ext2fs_read_bitmaps(fs); 93 qf_ino = (qtype == USRQUOTA) ? fs->super->s_usr_quota_inum : 94 fs->super->s_grp_quota_inum; 95 quota_set_sb_inum(fs, 0, qtype); 96 /* Truncate the inode only if its a reserved one. */ 97 if (qf_ino < EXT2_FIRST_INODE(fs->super)) 98 quota_inode_truncate(fs, qf_ino); 99 100 ext2fs_mark_super_dirty(fs); 101 fs->flags &= ~EXT2_FLAG_SUPER_ONLY; 102 ext2fs_write_bitmaps(fs); 103 return 0; 104 } 105 106 static void write_dquots(dict_t *dict, struct quota_handle *qh) 107 { 108 dnode_t *n; 109 struct dquot *dq; 110 111 for (n = dict_first(dict); n; n = dict_next(dict, n)) { 112 dq = dnode_get(n); 113 if (dq) { 114 dq->dq_h = qh; 115 update_grace_times(dq); 116 qh->qh_ops->commit_dquot(dq); 117 } 118 } 119 } 120 121 errcode_t quota_write_inode(quota_ctx_t qctx, int qtype) 122 { 123 int retval = 0, i; 124 dict_t *dict; 125 ext2_filsys fs; 126 struct quota_handle *h = NULL; 127 int fmt = QFMT_VFS_V1; 128 129 if (!qctx) 130 return 0; 131 132 fs = qctx->fs; 133 retval = ext2fs_get_mem(sizeof(struct quota_handle), &h); 134 if (retval) { 135 log_err("Unable to allocate quota handle"); 136 goto out; 137 } 138 139 ext2fs_read_bitmaps(fs); 140 141 for (i = 0; i < MAXQUOTAS; i++) { 142 if ((qtype != -1) && (i != qtype)) 143 continue; 144 145 dict = qctx->quota_dict[i]; 146 if (!dict) 147 continue; 148 149 retval = quota_file_create(h, fs, i, fmt); 150 if (retval < 0) { 151 log_err("Cannot initialize io on quotafile"); 152 continue; 153 } 154 155 write_dquots(dict, h); 156 retval = quota_file_close(h); 157 if (retval < 0) { 158 log_err("Cannot finish IO on new quotafile: %s", 159 strerror(errno)); 160 if (h->qh_qf.e2_file) 161 ext2fs_file_close(h->qh_qf.e2_file); 162 quota_inode_truncate(fs, h->qh_qf.ino); 163 continue; 164 } 165 166 /* Set quota inode numbers in superblock. */ 167 quota_set_sb_inum(fs, h->qh_qf.ino, i); 168 ext2fs_mark_super_dirty(fs); 169 ext2fs_mark_bb_dirty(fs); 170 fs->flags &= ~EXT2_FLAG_SUPER_ONLY; 171 } 172 173 ext2fs_write_bitmaps(fs); 174 out: 175 if (h) 176 ext2fs_free_mem(&h); 177 return retval; 178 } 179 180 /******************************************************************/ 181 /* Helper functions for computing quota in memory. */ 182 /******************************************************************/ 183 184 static int dict_uint_cmp(const void *a, const void *b) 185 { 186 unsigned int c, d; 187 188 c = VOIDPTR_TO_UINT(a); 189 d = VOIDPTR_TO_UINT(b); 190 191 return c - d; 192 } 193 194 static inline qid_t get_qid(struct ext2_inode *inode, int qtype) 195 { 196 if (qtype == USRQUOTA) 197 return inode_uid(*inode); 198 return inode_gid(*inode); 199 } 200 201 static void quota_dnode_free(dnode_t *node, 202 void *context EXT2FS_ATTR((unused))) 203 { 204 void *ptr = node ? dnode_get(node) : 0; 205 206 ext2fs_free_mem(&ptr); 207 free(node); 208 } 209 210 /* 211 * Set up the quota tracking data structures. 212 */ 213 errcode_t quota_init_context(quota_ctx_t *qctx, ext2_filsys fs, int qtype) 214 { 215 int i, err = 0; 216 dict_t *dict; 217 quota_ctx_t ctx; 218 219 err = ext2fs_get_mem(sizeof(struct quota_ctx), &ctx); 220 if (err) { 221 log_err("Failed to allocate quota context"); 222 return err; 223 } 224 225 memset(ctx, 0, sizeof(struct quota_ctx)); 226 for (i = 0; i < MAXQUOTAS; i++) { 227 if ((qtype != -1) && (i != qtype)) 228 continue; 229 err = ext2fs_get_mem(sizeof(dict_t), &dict); 230 if (err) { 231 log_err("Failed to allocate dictionary"); 232 quota_release_context(&ctx); 233 return err; 234 } 235 ctx->quota_dict[i] = dict; 236 dict_init(dict, DICTCOUNT_T_MAX, dict_uint_cmp); 237 dict_set_allocator(dict, NULL, quota_dnode_free, NULL); 238 } 239 240 ctx->fs = fs; 241 *qctx = ctx; 242 return 0; 243 } 244 245 void quota_release_context(quota_ctx_t *qctx) 246 { 247 dict_t *dict; 248 int i; 249 quota_ctx_t ctx; 250 251 if (!qctx) 252 return; 253 254 ctx = *qctx; 255 for (i = 0; i < MAXQUOTAS; i++) { 256 dict = ctx->quota_dict[i]; 257 ctx->quota_dict[i] = 0; 258 if (dict) { 259 dict_free_nodes(dict); 260 free(dict); 261 } 262 } 263 *qctx = NULL; 264 free(ctx); 265 } 266 267 static struct dquot *get_dq(dict_t *dict, __u32 key) 268 { 269 struct dquot *dq; 270 dnode_t *n; 271 272 n = dict_lookup(dict, UINT_TO_VOIDPTR(key)); 273 if (n) 274 dq = dnode_get(n); 275 else { 276 if (ext2fs_get_mem(sizeof(struct dquot), &dq)) { 277 log_err("Unable to allocate dquot"); 278 return NULL; 279 } 280 memset(dq, 0, sizeof(struct dquot)); 281 dict_alloc_insert(dict, UINT_TO_VOIDPTR(key), dq); 282 dq->dq_id = key; 283 } 284 return dq; 285 } 286 287 288 /* 289 * Called to update the blocks used by a particular inode 290 */ 291 void quota_data_add(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino, 292 qsize_t space) 293 { 294 struct dquot *dq; 295 dict_t *dict; 296 int i; 297 298 if (!qctx) 299 return; 300 301 log_debug("ADD_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino, 302 inode_uid(*inode), 303 inode_gid(*inode), space); 304 for (i = 0; i < MAXQUOTAS; i++) { 305 dict = qctx->quota_dict[i]; 306 if (dict) { 307 dq = get_dq(dict, get_qid(inode, i)); 308 if (dq) 309 dq->dq_dqb.dqb_curspace += space; 310 } 311 } 312 } 313 314 /* 315 * Called to remove some blocks used by a particular inode 316 */ 317 void quota_data_sub(quota_ctx_t qctx, struct ext2_inode *inode, ext2_ino_t ino, 318 qsize_t space) 319 { 320 struct dquot *dq; 321 dict_t *dict; 322 int i; 323 324 if (!qctx) 325 return; 326 327 log_debug("SUB_DATA: Inode: %u, UID/GID: %u/%u, space: %ld", ino, 328 inode_uid(*inode), 329 inode_gid(*inode), space); 330 for (i = 0; i < MAXQUOTAS; i++) { 331 dict = qctx->quota_dict[i]; 332 if (dict) { 333 dq = get_dq(dict, get_qid(inode, i)); 334 dq->dq_dqb.dqb_curspace -= space; 335 } 336 } 337 } 338 339 /* 340 * Called to count the files used by an inode's user/group 341 */ 342 void quota_data_inodes(quota_ctx_t qctx, struct ext2_inode *inode, 343 ext2_ino_t ino, int adjust) 344 { 345 struct dquot *dq; 346 dict_t *dict; 347 int i; 348 349 if (!qctx) 350 return; 351 352 log_debug("ADJ_INODE: Inode: %u, UID/GID: %u/%u, adjust: %d", ino, 353 inode_uid(*inode), 354 inode_gid(*inode), adjust); 355 for (i = 0; i < MAXQUOTAS; i++) { 356 dict = qctx->quota_dict[i]; 357 if (dict) { 358 dq = get_dq(dict, get_qid(inode, i)); 359 dq->dq_dqb.dqb_curinodes += adjust; 360 } 361 } 362 } 363 364 errcode_t quota_compute_usage(quota_ctx_t qctx) 365 { 366 ext2_filsys fs; 367 ext2_ino_t ino; 368 errcode_t ret; 369 struct ext2_inode inode; 370 qsize_t space; 371 ext2_inode_scan scan; 372 373 if (!qctx) 374 return 0; 375 376 fs = qctx->fs; 377 ret = ext2fs_open_inode_scan(fs, 0, &scan); 378 if (ret) { 379 log_err("while opening inode scan. ret=%ld", ret); 380 return ret; 381 } 382 383 while (1) { 384 ret = ext2fs_get_next_inode(scan, &ino, &inode); 385 if (ret) { 386 log_err("while getting next inode. ret=%ld", ret); 387 ext2fs_close_inode_scan(scan); 388 return ret; 389 } 390 if (ino == 0) 391 break; 392 if (inode.i_links_count && 393 (ino == EXT2_ROOT_INO || 394 ino >= EXT2_FIRST_INODE(fs->super))) { 395 space = ext2fs_inode_i_blocks(fs, &inode) << 9; 396 quota_data_add(qctx, &inode, ino, space); 397 quota_data_inodes(qctx, &inode, ino, +1); 398 } 399 } 400 401 ext2fs_close_inode_scan(scan); 402 403 return 0; 404 } 405 406 struct scan_dquots_data { 407 dict_t *quota_dict; 408 int update_limits; /* update limits from disk */ 409 int update_usage; 410 int usage_is_inconsistent; 411 }; 412 413 static int scan_dquots_callback(struct dquot *dquot, void *cb_data) 414 { 415 struct scan_dquots_data *scan_data = cb_data; 416 dict_t *quota_dict = scan_data->quota_dict; 417 struct dquot *dq; 418 419 dq = get_dq(quota_dict, dquot->dq_id); 420 dq->dq_id = dquot->dq_id; 421 dq->dq_dqb.u.v2_mdqb.dqb_off = dquot->dq_dqb.u.v2_mdqb.dqb_off; 422 423 /* Check if there is inconsistancy. */ 424 if (dq->dq_dqb.dqb_curspace != dquot->dq_dqb.dqb_curspace || 425 dq->dq_dqb.dqb_curinodes != dquot->dq_dqb.dqb_curinodes) { 426 scan_data->usage_is_inconsistent = 1; 427 fprintf(stderr, "[QUOTA WARNING] Usage inconsistent for ID %d:" 428 "actual (%llu, %llu) != expected (%llu, %llu)\n", 429 dq->dq_id, (long long)dq->dq_dqb.dqb_curspace, 430 (long long)dq->dq_dqb.dqb_curinodes, 431 (long long)dquot->dq_dqb.dqb_curspace, 432 (long long)dquot->dq_dqb.dqb_curinodes); 433 } 434 435 if (scan_data->update_limits) { 436 dq->dq_dqb.dqb_ihardlimit = dquot->dq_dqb.dqb_ihardlimit; 437 dq->dq_dqb.dqb_isoftlimit = dquot->dq_dqb.dqb_isoftlimit; 438 dq->dq_dqb.dqb_bhardlimit = dquot->dq_dqb.dqb_bhardlimit; 439 dq->dq_dqb.dqb_bsoftlimit = dquot->dq_dqb.dqb_bsoftlimit; 440 } 441 442 if (scan_data->update_usage) { 443 dq->dq_dqb.dqb_curspace = dquot->dq_dqb.dqb_curspace; 444 dq->dq_dqb.dqb_curinodes = dquot->dq_dqb.dqb_curinodes; 445 } 446 447 return 0; 448 } 449 450 /* 451 * Read all dquots from quota file into memory 452 */ 453 static errcode_t quota_read_all_dquots(struct quota_handle *qh, 454 quota_ctx_t qctx, int update_limits) 455 { 456 struct scan_dquots_data scan_data; 457 458 scan_data.quota_dict = qctx->quota_dict[qh->qh_type]; 459 scan_data.update_limits = update_limits; 460 scan_data.update_usage = 0; 461 462 return qh->qh_ops->scan_dquots(qh, scan_dquots_callback, &scan_data); 463 } 464 465 /* 466 * Write all memory dquots into quota file 467 */ 468 #if 0 /* currently unused, but may be useful in the future? */ 469 static errcode_t quota_write_all_dquots(struct quota_handle *qh, 470 quota_ctx_t qctx) 471 { 472 errcode_t err; 473 474 err = ext2fs_read_bitmaps(qctx->fs); 475 if (err) 476 return err; 477 write_dquots(qctx->quota_dict[qh->qh_type], qh); 478 ext2fs_mark_bb_dirty(qctx->fs); 479 qctx->fs->flags &= ~EXT2_FLAG_SUPER_ONLY; 480 ext2fs_write_bitmaps(qctx->fs); 481 return 0; 482 } 483 #endif 484 485 /* 486 * Updates the in-memory quota limits from the given quota inode. 487 */ 488 errcode_t quota_update_limits(quota_ctx_t qctx, ext2_ino_t qf_ino, int type) 489 { 490 struct quota_handle *qh; 491 errcode_t err; 492 493 if (!qctx) 494 return 0; 495 496 err = ext2fs_get_mem(sizeof(struct quota_handle), &qh); 497 if (err) { 498 log_err("Unable to allocate quota handle"); 499 return err; 500 } 501 502 err = quota_file_open(qh, qctx->fs, qf_ino, type, -1, 0); 503 if (err) { 504 log_err("Open quota file failed"); 505 goto out; 506 } 507 508 quota_read_all_dquots(qh, qctx, 1); 509 510 err = quota_file_close(qh); 511 if (err) { 512 log_err("Cannot finish IO on new quotafile: %s", 513 strerror(errno)); 514 if (qh->qh_qf.e2_file) 515 ext2fs_file_close(qh->qh_qf.e2_file); 516 } 517 out: 518 ext2fs_free_mem(&qh); 519 return err; 520 } 521 522 /* 523 * Compares the measured quota in qctx->quota_dict with that in the quota inode 524 * on disk and updates the limits in qctx->quota_dict. 'usage_inconsistent' is 525 * set to 1 if the supplied and on-disk quota usage values are not identical. 526 */ 527 errcode_t quota_compare_and_update(quota_ctx_t qctx, int qtype, 528 int *usage_inconsistent) 529 { 530 ext2_filsys fs = qctx->fs; 531 struct quota_handle qh; 532 struct scan_dquots_data scan_data; 533 ext2_ino_t qf_ino; 534 errcode_t err = 0; 535 536 if (!qctx->quota_dict[qtype]) 537 goto out; 538 539 qf_ino = qtype == USRQUOTA ? fs->super->s_usr_quota_inum : 540 fs->super->s_grp_quota_inum; 541 err = quota_file_open(&qh, fs, qf_ino, qtype, -1, 0); 542 if (err) { 543 log_err("Open quota file failed"); 544 goto out; 545 } 546 547 scan_data.quota_dict = qctx->quota_dict[qtype]; 548 scan_data.update_limits = 1; 549 scan_data.update_usage = 0; 550 scan_data.usage_is_inconsistent = 0; 551 err = qh.qh_ops->scan_dquots(&qh, scan_dquots_callback, &scan_data); 552 if (err) { 553 log_err("Error scanning dquots"); 554 goto out; 555 } 556 *usage_inconsistent = scan_data.usage_is_inconsistent; 557 558 out: 559 return err; 560 } 561
