1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 /* 11 * Quota change tags are associated with each transaction that allocates or 12 * deallocates space. Those changes are accumulated locally to each node (in a 13 * per-node file) and then are periodically synced to the quota file. This 14 * avoids the bottleneck of constantly touching the quota file, but introduces 15 * fuzziness in the current usage value of IDs that are being used on different 16 * nodes in the cluster simultaneously. So, it is possible for a user on 17 * multiple nodes to overrun their quota, but that overrun is controlable. 18 * Since quota tags are part of transactions, there is no need for a quota check 19 * program to be run on node crashes or anything like that. 20 * 21 * There are couple of knobs that let the administrator manage the quota 22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be 23 * sitting on one node before being synced to the quota file. (The default is 24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency 25 * of quota file syncs increases as the user moves closer to their limit. The 26 * more frequent the syncs, the more accurate the quota enforcement, but that 27 * means that there is more contention between the nodes for the quota file. 28 * The default value is one. This sets the maximum theoretical quota overrun 29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In 30 * practice, the maximum overrun you see should be much less.) A "quota_scale" 31 * number greater than one makes quota syncs more frequent and reduces the 32 * maximum overrun. Numbers less than one (but greater than zero) make quota 33 * syncs less frequent. 34 * 35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of 36 * the quota file, so it is not being constantly read. 37 */ 38 39 #include <linux/sched.h> 40 #include <linux/slab.h> 41 #include <linux/mm.h> 42 #include <linux/spinlock.h> 43 #include <linux/completion.h> 44 #include <linux/buffer_head.h> 45 #include <linux/sort.h> 46 #include <linux/fs.h> 47 #include <linux/bio.h> 48 #include <linux/gfs2_ondisk.h> 49 #include <linux/kthread.h> 50 #include <linux/freezer.h> 51 #include <linux/quota.h> 52 #include <linux/dqblk_xfs.h> 53 #include <linux/lockref.h> 54 #include <linux/list_lru.h> 55 56 #include "gfs2.h" 57 #include "incore.h" 58 #include "bmap.h" 59 #include "glock.h" 60 #include "glops.h" 61 #include "log.h" 62 #include "meta_io.h" 63 #include "quota.h" 64 #include "rgrp.h" 65 #include "super.h" 66 #include "trans.h" 67 #include "inode.h" 68 #include "util.h" 69 70 struct gfs2_quota_change_host { 71 u64 qc_change; 72 u32 qc_flags; /* GFS2_QCF_... */ 73 struct kqid qc_id; 74 }; 75 76 /* Lock order: qd_lock -> qd->lockref.lock -> lru lock */ 77 static DEFINE_SPINLOCK(qd_lock); 78 struct list_lru gfs2_qd_lru; 79 80 static void gfs2_qd_dispose(struct list_head *list) 81 { 82 struct gfs2_quota_data *qd; 83 struct gfs2_sbd *sdp; 84 85 while (!list_empty(list)) { 86 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru); 87 sdp = qd->qd_gl->gl_sbd; 88 89 list_del(&qd->qd_lru); 90 91 /* Free from the filesystem-specific list */ 92 spin_lock(&qd_lock); 93 list_del(&qd->qd_list); 94 spin_unlock(&qd_lock); 95 96 gfs2_assert_warn(sdp, !qd->qd_change); 97 gfs2_assert_warn(sdp, !qd->qd_slot_count); 98 gfs2_assert_warn(sdp, !qd->qd_bh_count); 99 100 gfs2_glock_put(qd->qd_gl); 101 atomic_dec(&sdp->sd_quota_count); 102 103 /* Delete it from the common reclaim list */ 104 kmem_cache_free(gfs2_quotad_cachep, qd); 105 } 106 } 107 108 109 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg) 110 { 111 struct list_head *dispose = arg; 112 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru); 113 114 if (!spin_trylock(&qd->qd_lockref.lock)) 115 return LRU_SKIP; 116 117 if (qd->qd_lockref.count == 0) { 118 lockref_mark_dead(&qd->qd_lockref); 119 list_move(&qd->qd_lru, dispose); 120 } 121 122 spin_unlock(&qd->qd_lockref.lock); 123 return LRU_REMOVED; 124 } 125 126 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, 127 struct shrink_control *sc) 128 { 129 LIST_HEAD(dispose); 130 unsigned long freed; 131 132 if (!(sc->gfp_mask & __GFP_FS)) 133 return SHRINK_STOP; 134 135 freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate, 136 &dispose, &sc->nr_to_scan); 137 138 gfs2_qd_dispose(&dispose); 139 140 return freed; 141 } 142 143 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, 144 struct shrink_control *sc) 145 { 146 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid)); 147 } 148 149 struct shrinker gfs2_qd_shrinker = { 150 .count_objects = gfs2_qd_shrink_count, 151 .scan_objects = gfs2_qd_shrink_scan, 152 .seeks = DEFAULT_SEEKS, 153 .flags = SHRINKER_NUMA_AWARE, 154 }; 155 156 157 static u64 qd2index(struct gfs2_quota_data *qd) 158 { 159 struct kqid qid = qd->qd_id; 160 return (2 * (u64)from_kqid(&init_user_ns, qid)) + 161 ((qid.type == USRQUOTA) ? 0 : 1); 162 } 163 164 static u64 qd2offset(struct gfs2_quota_data *qd) 165 { 166 u64 offset; 167 168 offset = qd2index(qd); 169 offset *= sizeof(struct gfs2_quota); 170 171 return offset; 172 } 173 174 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid, 175 struct gfs2_quota_data **qdp) 176 { 177 struct gfs2_quota_data *qd; 178 int error; 179 180 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 181 if (!qd) 182 return -ENOMEM; 183 184 qd->qd_lockref.count = 1; 185 spin_lock_init(&qd->qd_lockref.lock); 186 qd->qd_id = qid; 187 qd->qd_slot = -1; 188 INIT_LIST_HEAD(&qd->qd_lru); 189 190 error = gfs2_glock_get(sdp, qd2index(qd), 191 &gfs2_quota_glops, CREATE, &qd->qd_gl); 192 if (error) 193 goto fail; 194 195 *qdp = qd; 196 197 return 0; 198 199 fail: 200 kmem_cache_free(gfs2_quotad_cachep, qd); 201 return error; 202 } 203 204 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid, 205 struct gfs2_quota_data **qdp) 206 { 207 struct gfs2_quota_data *qd = NULL, *new_qd = NULL; 208 int error, found; 209 210 *qdp = NULL; 211 212 for (;;) { 213 found = 0; 214 spin_lock(&qd_lock); 215 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 216 if (qid_eq(qd->qd_id, qid) && 217 lockref_get_not_dead(&qd->qd_lockref)) { 218 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 219 found = 1; 220 break; 221 } 222 } 223 224 if (!found) 225 qd = NULL; 226 227 if (!qd && new_qd) { 228 qd = new_qd; 229 list_add(&qd->qd_list, &sdp->sd_quota_list); 230 atomic_inc(&sdp->sd_quota_count); 231 new_qd = NULL; 232 } 233 234 spin_unlock(&qd_lock); 235 236 if (qd) { 237 if (new_qd) { 238 gfs2_glock_put(new_qd->qd_gl); 239 kmem_cache_free(gfs2_quotad_cachep, new_qd); 240 } 241 *qdp = qd; 242 return 0; 243 } 244 245 error = qd_alloc(sdp, qid, &new_qd); 246 if (error) 247 return error; 248 } 249 } 250 251 static void qd_hold(struct gfs2_quota_data *qd) 252 { 253 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 254 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref)); 255 lockref_get(&qd->qd_lockref); 256 } 257 258 static void qd_put(struct gfs2_quota_data *qd) 259 { 260 if (lockref_put_or_lock(&qd->qd_lockref)) 261 return; 262 263 qd->qd_lockref.count = 0; 264 list_lru_add(&gfs2_qd_lru, &qd->qd_lru); 265 spin_unlock(&qd->qd_lockref.lock); 266 267 } 268 269 static int slot_get(struct gfs2_quota_data *qd) 270 { 271 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 272 unsigned int c, o = 0, b; 273 unsigned char byte = 0; 274 275 spin_lock(&qd_lock); 276 277 if (qd->qd_slot_count++) { 278 spin_unlock(&qd_lock); 279 return 0; 280 } 281 282 for (c = 0; c < sdp->sd_quota_chunks; c++) 283 for (o = 0; o < PAGE_SIZE; o++) { 284 byte = sdp->sd_quota_bitmap[c][o]; 285 if (byte != 0xFF) 286 goto found; 287 } 288 289 goto fail; 290 291 found: 292 for (b = 0; b < 8; b++) 293 if (!(byte & (1 << b))) 294 break; 295 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b; 296 297 if (qd->qd_slot >= sdp->sd_quota_slots) 298 goto fail; 299 300 sdp->sd_quota_bitmap[c][o] |= 1 << b; 301 302 spin_unlock(&qd_lock); 303 304 return 0; 305 306 fail: 307 qd->qd_slot_count--; 308 spin_unlock(&qd_lock); 309 return -ENOSPC; 310 } 311 312 static void slot_hold(struct gfs2_quota_data *qd) 313 { 314 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 315 316 spin_lock(&qd_lock); 317 gfs2_assert(sdp, qd->qd_slot_count); 318 qd->qd_slot_count++; 319 spin_unlock(&qd_lock); 320 } 321 322 static void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap, 323 unsigned int bit, int new_value) 324 { 325 unsigned int c, o, b = bit; 326 int old_value; 327 328 c = b / (8 * PAGE_SIZE); 329 b %= 8 * PAGE_SIZE; 330 o = b / 8; 331 b %= 8; 332 333 old_value = (bitmap[c][o] & (1 << b)); 334 gfs2_assert_withdraw(sdp, !old_value != !new_value); 335 336 if (new_value) 337 bitmap[c][o] |= 1 << b; 338 else 339 bitmap[c][o] &= ~(1 << b); 340 } 341 342 static void slot_put(struct gfs2_quota_data *qd) 343 { 344 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 345 346 spin_lock(&qd_lock); 347 gfs2_assert(sdp, qd->qd_slot_count); 348 if (!--qd->qd_slot_count) { 349 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0); 350 qd->qd_slot = -1; 351 } 352 spin_unlock(&qd_lock); 353 } 354 355 static int bh_get(struct gfs2_quota_data *qd) 356 { 357 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 358 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 359 unsigned int block, offset; 360 struct buffer_head *bh; 361 int error; 362 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 363 364 mutex_lock(&sdp->sd_quota_mutex); 365 366 if (qd->qd_bh_count++) { 367 mutex_unlock(&sdp->sd_quota_mutex); 368 return 0; 369 } 370 371 block = qd->qd_slot / sdp->sd_qc_per_block; 372 offset = qd->qd_slot % sdp->sd_qc_per_block; 373 374 bh_map.b_size = 1 << ip->i_inode.i_blkbits; 375 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 376 if (error) 377 goto fail; 378 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh); 379 if (error) 380 goto fail; 381 error = -EIO; 382 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 383 goto fail_brelse; 384 385 qd->qd_bh = bh; 386 qd->qd_bh_qc = (struct gfs2_quota_change *) 387 (bh->b_data + sizeof(struct gfs2_meta_header) + 388 offset * sizeof(struct gfs2_quota_change)); 389 390 mutex_unlock(&sdp->sd_quota_mutex); 391 392 return 0; 393 394 fail_brelse: 395 brelse(bh); 396 fail: 397 qd->qd_bh_count--; 398 mutex_unlock(&sdp->sd_quota_mutex); 399 return error; 400 } 401 402 static void bh_put(struct gfs2_quota_data *qd) 403 { 404 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 405 406 mutex_lock(&sdp->sd_quota_mutex); 407 gfs2_assert(sdp, qd->qd_bh_count); 408 if (!--qd->qd_bh_count) { 409 brelse(qd->qd_bh); 410 qd->qd_bh = NULL; 411 qd->qd_bh_qc = NULL; 412 } 413 mutex_unlock(&sdp->sd_quota_mutex); 414 } 415 416 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd, 417 u64 *sync_gen) 418 { 419 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 420 !test_bit(QDF_CHANGE, &qd->qd_flags) || 421 (sync_gen && (qd->qd_sync_gen >= *sync_gen))) 422 return 0; 423 424 if (!lockref_get_not_dead(&qd->qd_lockref)) 425 return 0; 426 427 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 428 set_bit(QDF_LOCKED, &qd->qd_flags); 429 qd->qd_change_sync = qd->qd_change; 430 gfs2_assert_warn(sdp, qd->qd_slot_count); 431 qd->qd_slot_count++; 432 return 1; 433 } 434 435 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 436 { 437 struct gfs2_quota_data *qd = NULL; 438 int error; 439 int found = 0; 440 441 *qdp = NULL; 442 443 if (sdp->sd_vfs->s_flags & MS_RDONLY) 444 return 0; 445 446 spin_lock(&qd_lock); 447 448 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 449 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen); 450 if (found) 451 break; 452 } 453 454 if (!found) 455 qd = NULL; 456 457 spin_unlock(&qd_lock); 458 459 if (qd) { 460 gfs2_assert_warn(sdp, qd->qd_change_sync); 461 error = bh_get(qd); 462 if (error) { 463 clear_bit(QDF_LOCKED, &qd->qd_flags); 464 slot_put(qd); 465 qd_put(qd); 466 return error; 467 } 468 } 469 470 *qdp = qd; 471 472 return 0; 473 } 474 475 static void qd_unlock(struct gfs2_quota_data *qd) 476 { 477 gfs2_assert_warn(qd->qd_gl->gl_sbd, 478 test_bit(QDF_LOCKED, &qd->qd_flags)); 479 clear_bit(QDF_LOCKED, &qd->qd_flags); 480 bh_put(qd); 481 slot_put(qd); 482 qd_put(qd); 483 } 484 485 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid, 486 struct gfs2_quota_data **qdp) 487 { 488 int error; 489 490 error = qd_get(sdp, qid, qdp); 491 if (error) 492 return error; 493 494 error = slot_get(*qdp); 495 if (error) 496 goto fail; 497 498 error = bh_get(*qdp); 499 if (error) 500 goto fail_slot; 501 502 return 0; 503 504 fail_slot: 505 slot_put(*qdp); 506 fail: 507 qd_put(*qdp); 508 return error; 509 } 510 511 static void qdsb_put(struct gfs2_quota_data *qd) 512 { 513 bh_put(qd); 514 slot_put(qd); 515 qd_put(qd); 516 } 517 518 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 519 { 520 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 521 struct gfs2_quota_data **qd; 522 int error; 523 524 if (ip->i_res == NULL) { 525 error = gfs2_rs_alloc(ip); 526 if (error) 527 return error; 528 } 529 530 qd = ip->i_res->rs_qa_qd; 531 532 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) || 533 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 534 return -EIO; 535 536 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 537 return 0; 538 539 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd); 540 if (error) 541 goto out; 542 ip->i_res->rs_qa_qd_num++; 543 qd++; 544 545 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd); 546 if (error) 547 goto out; 548 ip->i_res->rs_qa_qd_num++; 549 qd++; 550 551 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) && 552 !uid_eq(uid, ip->i_inode.i_uid)) { 553 error = qdsb_get(sdp, make_kqid_uid(uid), qd); 554 if (error) 555 goto out; 556 ip->i_res->rs_qa_qd_num++; 557 qd++; 558 } 559 560 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) && 561 !gid_eq(gid, ip->i_inode.i_gid)) { 562 error = qdsb_get(sdp, make_kqid_gid(gid), qd); 563 if (error) 564 goto out; 565 ip->i_res->rs_qa_qd_num++; 566 qd++; 567 } 568 569 out: 570 if (error) 571 gfs2_quota_unhold(ip); 572 return error; 573 } 574 575 void gfs2_quota_unhold(struct gfs2_inode *ip) 576 { 577 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 578 unsigned int x; 579 580 if (ip->i_res == NULL) 581 return; 582 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 583 584 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 585 qdsb_put(ip->i_res->rs_qa_qd[x]); 586 ip->i_res->rs_qa_qd[x] = NULL; 587 } 588 ip->i_res->rs_qa_qd_num = 0; 589 } 590 591 static int sort_qd(const void *a, const void *b) 592 { 593 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 594 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 595 596 if (qid_lt(qd_a->qd_id, qd_b->qd_id)) 597 return -1; 598 if (qid_lt(qd_b->qd_id, qd_a->qd_id)) 599 return 1; 600 return 0; 601 } 602 603 static void do_qc(struct gfs2_quota_data *qd, s64 change) 604 { 605 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 606 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 607 struct gfs2_quota_change *qc = qd->qd_bh_qc; 608 s64 x; 609 610 mutex_lock(&sdp->sd_quota_mutex); 611 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh); 612 613 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 614 qc->qc_change = 0; 615 qc->qc_flags = 0; 616 if (qd->qd_id.type == USRQUOTA) 617 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 618 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id)); 619 } 620 621 x = be64_to_cpu(qc->qc_change) + change; 622 qc->qc_change = cpu_to_be64(x); 623 624 spin_lock(&qd_lock); 625 qd->qd_change = x; 626 spin_unlock(&qd_lock); 627 628 if (!x) { 629 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 630 clear_bit(QDF_CHANGE, &qd->qd_flags); 631 qc->qc_flags = 0; 632 qc->qc_id = 0; 633 slot_put(qd); 634 qd_put(qd); 635 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 636 qd_hold(qd); 637 slot_hold(qd); 638 } 639 640 mutex_unlock(&sdp->sd_quota_mutex); 641 } 642 643 /** 644 * gfs2_adjust_quota - adjust record of current block usage 645 * @ip: The quota inode 646 * @loc: Offset of the entry in the quota file 647 * @change: The amount of usage change to record 648 * @qd: The quota data 649 * @fdq: The updated limits to record 650 * 651 * This function was mostly borrowed from gfs2_block_truncate_page which was 652 * in turn mostly borrowed from ext3 653 * 654 * Returns: 0 or -ve on error 655 */ 656 657 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 658 s64 change, struct gfs2_quota_data *qd, 659 struct fs_disk_quota *fdq) 660 { 661 struct inode *inode = &ip->i_inode; 662 struct gfs2_sbd *sdp = GFS2_SB(inode); 663 struct address_space *mapping = inode->i_mapping; 664 unsigned long index = loc >> PAGE_CACHE_SHIFT; 665 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 666 unsigned blocksize, iblock, pos; 667 struct buffer_head *bh; 668 struct page *page; 669 void *kaddr, *ptr; 670 struct gfs2_quota q; 671 int err, nbytes; 672 u64 size; 673 674 if (gfs2_is_stuffed(ip)) { 675 err = gfs2_unstuff_dinode(ip, NULL); 676 if (err) 677 return err; 678 } 679 680 memset(&q, 0, sizeof(struct gfs2_quota)); 681 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); 682 if (err < 0) 683 return err; 684 685 err = -EIO; 686 be64_add_cpu(&q.qu_value, change); 687 qd->qd_qb.qb_value = q.qu_value; 688 if (fdq) { 689 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 690 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 691 qd->qd_qb.qb_warn = q.qu_warn; 692 } 693 if (fdq->d_fieldmask & FS_DQ_BHARD) { 694 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 695 qd->qd_qb.qb_limit = q.qu_limit; 696 } 697 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 698 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 699 qd->qd_qb.qb_value = q.qu_value; 700 } 701 } 702 703 /* Write the quota into the quota file on disk */ 704 ptr = &q; 705 nbytes = sizeof(struct gfs2_quota); 706 get_a_page: 707 page = find_or_create_page(mapping, index, GFP_NOFS); 708 if (!page) 709 return -ENOMEM; 710 711 blocksize = inode->i_sb->s_blocksize; 712 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 713 714 if (!page_has_buffers(page)) 715 create_empty_buffers(page, blocksize, 0); 716 717 bh = page_buffers(page); 718 pos = blocksize; 719 while (offset >= pos) { 720 bh = bh->b_this_page; 721 iblock++; 722 pos += blocksize; 723 } 724 725 if (!buffer_mapped(bh)) { 726 gfs2_block_map(inode, iblock, bh, 1); 727 if (!buffer_mapped(bh)) 728 goto unlock_out; 729 /* If it's a newly allocated disk block for quota, zero it */ 730 if (buffer_new(bh)) 731 zero_user(page, pos - blocksize, bh->b_size); 732 } 733 734 if (PageUptodate(page)) 735 set_buffer_uptodate(bh); 736 737 if (!buffer_uptodate(bh)) { 738 ll_rw_block(READ | REQ_META, 1, &bh); 739 wait_on_buffer(bh); 740 if (!buffer_uptodate(bh)) 741 goto unlock_out; 742 } 743 744 gfs2_trans_add_data(ip->i_gl, bh); 745 746 kaddr = kmap_atomic(page); 747 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 748 nbytes = PAGE_CACHE_SIZE - offset; 749 memcpy(kaddr + offset, ptr, nbytes); 750 flush_dcache_page(page); 751 kunmap_atomic(kaddr); 752 unlock_page(page); 753 page_cache_release(page); 754 755 /* If quota straddles page boundary, we need to update the rest of the 756 * quota at the beginning of the next page */ 757 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 758 ptr = ptr + nbytes; 759 nbytes = sizeof(struct gfs2_quota) - nbytes; 760 offset = 0; 761 index++; 762 goto get_a_page; 763 } 764 765 size = loc + sizeof(struct gfs2_quota); 766 if (size > inode->i_size) 767 i_size_write(inode, size); 768 inode->i_mtime = inode->i_atime = CURRENT_TIME; 769 mark_inode_dirty(inode); 770 return 0; 771 772 unlock_out: 773 unlock_page(page); 774 page_cache_release(page); 775 return err; 776 } 777 778 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 779 { 780 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 781 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 782 struct gfs2_alloc_parms ap = { .aflags = 0, }; 783 unsigned int data_blocks, ind_blocks; 784 struct gfs2_holder *ghs, i_gh; 785 unsigned int qx, x; 786 struct gfs2_quota_data *qd; 787 unsigned reserved; 788 loff_t offset; 789 unsigned int nalloc = 0, blocks; 790 int error; 791 792 error = gfs2_rs_alloc(ip); 793 if (error) 794 return error; 795 796 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 797 &data_blocks, &ind_blocks); 798 799 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 800 if (!ghs) 801 return -ENOMEM; 802 803 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 804 mutex_lock(&ip->i_inode.i_mutex); 805 for (qx = 0; qx < num_qd; qx++) { 806 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 807 GL_NOCACHE, &ghs[qx]); 808 if (error) 809 goto out; 810 } 811 812 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 813 if (error) 814 goto out; 815 816 for (x = 0; x < num_qd; x++) { 817 offset = qd2offset(qda[x]); 818 if (gfs2_write_alloc_required(ip, offset, 819 sizeof(struct gfs2_quota))) 820 nalloc++; 821 } 822 823 /* 824 * 1 blk for unstuffing inode if stuffed. We add this extra 825 * block to the reservation unconditionally. If the inode 826 * doesn't need unstuffing, the block will be released to the 827 * rgrp since it won't be allocated during the transaction 828 */ 829 /* +3 in the end for unstuffing block, inode size update block 830 * and another block in case quota straddles page boundary and 831 * two blocks need to be updated instead of 1 */ 832 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 833 834 reserved = 1 + (nalloc * (data_blocks + ind_blocks)); 835 ap.target = reserved; 836 error = gfs2_inplace_reserve(ip, &ap); 837 if (error) 838 goto out_alloc; 839 840 if (nalloc) 841 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; 842 843 error = gfs2_trans_begin(sdp, blocks, 0); 844 if (error) 845 goto out_ipres; 846 847 for (x = 0; x < num_qd; x++) { 848 qd = qda[x]; 849 offset = qd2offset(qd); 850 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 851 if (error) 852 goto out_end_trans; 853 854 do_qc(qd, -qd->qd_change_sync); 855 set_bit(QDF_REFRESH, &qd->qd_flags); 856 } 857 858 error = 0; 859 860 out_end_trans: 861 gfs2_trans_end(sdp); 862 out_ipres: 863 gfs2_inplace_release(ip); 864 out_alloc: 865 gfs2_glock_dq_uninit(&i_gh); 866 out: 867 while (qx--) 868 gfs2_glock_dq_uninit(&ghs[qx]); 869 mutex_unlock(&ip->i_inode.i_mutex); 870 kfree(ghs); 871 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); 872 return error; 873 } 874 875 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 876 { 877 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 878 struct gfs2_quota q; 879 struct gfs2_quota_lvb *qlvb; 880 loff_t pos; 881 int error; 882 883 memset(&q, 0, sizeof(struct gfs2_quota)); 884 pos = qd2offset(qd); 885 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); 886 if (error < 0) 887 return error; 888 889 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 890 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 891 qlvb->__pad = 0; 892 qlvb->qb_limit = q.qu_limit; 893 qlvb->qb_warn = q.qu_warn; 894 qlvb->qb_value = q.qu_value; 895 qd->qd_qb = *qlvb; 896 897 return 0; 898 } 899 900 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 901 struct gfs2_holder *q_gh) 902 { 903 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 904 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 905 struct gfs2_holder i_gh; 906 int error; 907 908 restart: 909 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 910 if (error) 911 return error; 912 913 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 914 915 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 916 gfs2_glock_dq_uninit(q_gh); 917 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 918 GL_NOCACHE, q_gh); 919 if (error) 920 return error; 921 922 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 923 if (error) 924 goto fail; 925 926 error = update_qd(sdp, qd); 927 if (error) 928 goto fail_gunlock; 929 930 gfs2_glock_dq_uninit(&i_gh); 931 gfs2_glock_dq_uninit(q_gh); 932 force_refresh = 0; 933 goto restart; 934 } 935 936 return 0; 937 938 fail_gunlock: 939 gfs2_glock_dq_uninit(&i_gh); 940 fail: 941 gfs2_glock_dq_uninit(q_gh); 942 return error; 943 } 944 945 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 946 { 947 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 948 struct gfs2_quota_data *qd; 949 unsigned int x; 950 int error = 0; 951 952 error = gfs2_quota_hold(ip, uid, gid); 953 if (error) 954 return error; 955 956 if (capable(CAP_SYS_RESOURCE) || 957 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 958 return 0; 959 960 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num, 961 sizeof(struct gfs2_quota_data *), sort_qd, NULL); 962 963 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 964 int force = NO_FORCE; 965 qd = ip->i_res->rs_qa_qd[x]; 966 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 967 force = FORCE; 968 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]); 969 if (error) 970 break; 971 } 972 973 if (!error) 974 set_bit(GIF_QD_LOCKED, &ip->i_flags); 975 else { 976 while (x--) 977 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 978 gfs2_quota_unhold(ip); 979 } 980 981 return error; 982 } 983 984 static int need_sync(struct gfs2_quota_data *qd) 985 { 986 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 987 struct gfs2_tune *gt = &sdp->sd_tune; 988 s64 value; 989 unsigned int num, den; 990 int do_sync = 1; 991 992 if (!qd->qd_qb.qb_limit) 993 return 0; 994 995 spin_lock(&qd_lock); 996 value = qd->qd_change; 997 spin_unlock(&qd_lock); 998 999 spin_lock(>->gt_spin); 1000 num = gt->gt_quota_scale_num; 1001 den = gt->gt_quota_scale_den; 1002 spin_unlock(>->gt_spin); 1003 1004 if (value < 0) 1005 do_sync = 0; 1006 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 1007 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1008 do_sync = 0; 1009 else { 1010 value *= gfs2_jindex_size(sdp) * num; 1011 value = div_s64(value, den); 1012 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 1013 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1014 do_sync = 0; 1015 } 1016 1017 return do_sync; 1018 } 1019 1020 void gfs2_quota_unlock(struct gfs2_inode *ip) 1021 { 1022 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1023 struct gfs2_quota_data *qda[4]; 1024 unsigned int count = 0; 1025 unsigned int x; 1026 int found; 1027 1028 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1029 goto out; 1030 1031 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1032 struct gfs2_quota_data *qd; 1033 int sync; 1034 1035 qd = ip->i_res->rs_qa_qd[x]; 1036 sync = need_sync(qd); 1037 1038 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 1039 if (!sync) 1040 continue; 1041 1042 spin_lock(&qd_lock); 1043 found = qd_check_sync(sdp, qd, NULL); 1044 spin_unlock(&qd_lock); 1045 1046 if (!found) 1047 continue; 1048 1049 gfs2_assert_warn(sdp, qd->qd_change_sync); 1050 if (bh_get(qd)) { 1051 clear_bit(QDF_LOCKED, &qd->qd_flags); 1052 slot_put(qd); 1053 qd_put(qd); 1054 continue; 1055 } 1056 1057 qda[count++] = qd; 1058 } 1059 1060 if (count) { 1061 do_sync(count, qda); 1062 for (x = 0; x < count; x++) 1063 qd_unlock(qda[x]); 1064 } 1065 1066 out: 1067 gfs2_quota_unhold(ip); 1068 } 1069 1070 #define MAX_LINE 256 1071 1072 static int print_message(struct gfs2_quota_data *qd, char *type) 1073 { 1074 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1075 1076 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1077 sdp->sd_fsname, type, 1078 (qd->qd_id.type == USRQUOTA) ? "user" : "group", 1079 from_kqid(&init_user_ns, qd->qd_id)); 1080 1081 return 0; 1082 } 1083 1084 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 1085 { 1086 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1087 struct gfs2_quota_data *qd; 1088 s64 value; 1089 unsigned int x; 1090 int error = 0; 1091 1092 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1093 return 0; 1094 1095 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1096 return 0; 1097 1098 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1099 qd = ip->i_res->rs_qa_qd[x]; 1100 1101 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1102 qid_eq(qd->qd_id, make_kqid_gid(gid)))) 1103 continue; 1104 1105 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1106 spin_lock(&qd_lock); 1107 value += qd->qd_change; 1108 spin_unlock(&qd_lock); 1109 1110 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1111 print_message(qd, "exceeded"); 1112 quota_send_warning(qd->qd_id, 1113 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1114 1115 error = -EDQUOT; 1116 break; 1117 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1118 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1119 time_after_eq(jiffies, qd->qd_last_warn + 1120 gfs2_tune_get(sdp, 1121 gt_quota_warn_period) * HZ)) { 1122 quota_send_warning(qd->qd_id, 1123 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1124 error = print_message(qd, "warning"); 1125 qd->qd_last_warn = jiffies; 1126 } 1127 } 1128 1129 return error; 1130 } 1131 1132 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1133 kuid_t uid, kgid_t gid) 1134 { 1135 struct gfs2_quota_data *qd; 1136 unsigned int x; 1137 1138 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1139 return; 1140 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1141 return; 1142 1143 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1144 qd = ip->i_res->rs_qa_qd[x]; 1145 1146 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1147 qid_eq(qd->qd_id, make_kqid_gid(gid))) { 1148 do_qc(qd, change); 1149 } 1150 } 1151 } 1152 1153 int gfs2_quota_sync(struct super_block *sb, int type) 1154 { 1155 struct gfs2_sbd *sdp = sb->s_fs_info; 1156 struct gfs2_quota_data **qda; 1157 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder); 1158 unsigned int num_qd; 1159 unsigned int x; 1160 int error = 0; 1161 1162 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1163 if (!qda) 1164 return -ENOMEM; 1165 1166 mutex_lock(&sdp->sd_quota_sync_mutex); 1167 sdp->sd_quota_sync_gen++; 1168 1169 do { 1170 num_qd = 0; 1171 1172 for (;;) { 1173 error = qd_fish(sdp, qda + num_qd); 1174 if (error || !qda[num_qd]) 1175 break; 1176 if (++num_qd == max_qd) 1177 break; 1178 } 1179 1180 if (num_qd) { 1181 if (!error) 1182 error = do_sync(num_qd, qda); 1183 if (!error) 1184 for (x = 0; x < num_qd; x++) 1185 qda[x]->qd_sync_gen = 1186 sdp->sd_quota_sync_gen; 1187 1188 for (x = 0; x < num_qd; x++) 1189 qd_unlock(qda[x]); 1190 } 1191 } while (!error && num_qd == max_qd); 1192 1193 mutex_unlock(&sdp->sd_quota_sync_mutex); 1194 kfree(qda); 1195 1196 return error; 1197 } 1198 1199 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid) 1200 { 1201 struct gfs2_quota_data *qd; 1202 struct gfs2_holder q_gh; 1203 int error; 1204 1205 error = qd_get(sdp, qid, &qd); 1206 if (error) 1207 return error; 1208 1209 error = do_glock(qd, FORCE, &q_gh); 1210 if (!error) 1211 gfs2_glock_dq_uninit(&q_gh); 1212 1213 qd_put(qd); 1214 return error; 1215 } 1216 1217 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1218 { 1219 const struct gfs2_quota_change *str = buf; 1220 1221 qc->qc_change = be64_to_cpu(str->qc_change); 1222 qc->qc_flags = be32_to_cpu(str->qc_flags); 1223 qc->qc_id = make_kqid(&init_user_ns, 1224 (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA, 1225 be32_to_cpu(str->qc_id)); 1226 } 1227 1228 int gfs2_quota_init(struct gfs2_sbd *sdp) 1229 { 1230 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1231 u64 size = i_size_read(sdp->sd_qc_inode); 1232 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1233 unsigned int x, slot = 0; 1234 unsigned int found = 0; 1235 u64 dblock; 1236 u32 extlen = 0; 1237 int error; 1238 1239 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1240 return -EIO; 1241 1242 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1243 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1244 1245 error = -ENOMEM; 1246 1247 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1248 sizeof(unsigned char *), GFP_NOFS); 1249 if (!sdp->sd_quota_bitmap) 1250 return error; 1251 1252 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1253 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1254 if (!sdp->sd_quota_bitmap[x]) 1255 goto fail; 1256 } 1257 1258 for (x = 0; x < blocks; x++) { 1259 struct buffer_head *bh; 1260 unsigned int y; 1261 1262 if (!extlen) { 1263 int new = 0; 1264 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1265 if (error) 1266 goto fail; 1267 } 1268 error = -EIO; 1269 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1270 if (!bh) 1271 goto fail; 1272 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1273 brelse(bh); 1274 goto fail; 1275 } 1276 1277 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1278 y++, slot++) { 1279 struct gfs2_quota_change_host qc; 1280 struct gfs2_quota_data *qd; 1281 1282 gfs2_quota_change_in(&qc, bh->b_data + 1283 sizeof(struct gfs2_meta_header) + 1284 y * sizeof(struct gfs2_quota_change)); 1285 if (!qc.qc_change) 1286 continue; 1287 1288 error = qd_alloc(sdp, qc.qc_id, &qd); 1289 if (error) { 1290 brelse(bh); 1291 goto fail; 1292 } 1293 1294 set_bit(QDF_CHANGE, &qd->qd_flags); 1295 qd->qd_change = qc.qc_change; 1296 qd->qd_slot = slot; 1297 qd->qd_slot_count = 1; 1298 1299 spin_lock(&qd_lock); 1300 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1301 list_add(&qd->qd_list, &sdp->sd_quota_list); 1302 atomic_inc(&sdp->sd_quota_count); 1303 spin_unlock(&qd_lock); 1304 1305 found++; 1306 } 1307 1308 brelse(bh); 1309 dblock++; 1310 extlen--; 1311 } 1312 1313 if (found) 1314 fs_info(sdp, "found %u quota changes\n", found); 1315 1316 return 0; 1317 1318 fail: 1319 gfs2_quota_cleanup(sdp); 1320 return error; 1321 } 1322 1323 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1324 { 1325 struct list_head *head = &sdp->sd_quota_list; 1326 struct gfs2_quota_data *qd; 1327 unsigned int x; 1328 1329 spin_lock(&qd_lock); 1330 while (!list_empty(head)) { 1331 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1332 1333 /* 1334 * To be removed in due course... we should be able to 1335 * ensure that all refs to the qd have done by this point 1336 * so that this rather odd test is not required 1337 */ 1338 spin_lock(&qd->qd_lockref.lock); 1339 if (qd->qd_lockref.count > 1 || 1340 (qd->qd_lockref.count && !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1341 spin_unlock(&qd->qd_lockref.lock); 1342 list_move(&qd->qd_list, head); 1343 spin_unlock(&qd_lock); 1344 schedule(); 1345 spin_lock(&qd_lock); 1346 continue; 1347 } 1348 spin_unlock(&qd->qd_lockref.lock); 1349 1350 list_del(&qd->qd_list); 1351 /* Also remove if this qd exists in the reclaim list */ 1352 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 1353 atomic_dec(&sdp->sd_quota_count); 1354 spin_unlock(&qd_lock); 1355 1356 if (!qd->qd_lockref.count) { 1357 gfs2_assert_warn(sdp, !qd->qd_change); 1358 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1359 } else 1360 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1361 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1362 1363 gfs2_glock_put(qd->qd_gl); 1364 kmem_cache_free(gfs2_quotad_cachep, qd); 1365 1366 spin_lock(&qd_lock); 1367 } 1368 spin_unlock(&qd_lock); 1369 1370 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1371 1372 if (sdp->sd_quota_bitmap) { 1373 for (x = 0; x < sdp->sd_quota_chunks; x++) 1374 kfree(sdp->sd_quota_bitmap[x]); 1375 kfree(sdp->sd_quota_bitmap); 1376 } 1377 } 1378 1379 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1380 { 1381 if (error == 0 || error == -EROFS) 1382 return; 1383 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1384 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1385 } 1386 1387 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1388 int (*fxn)(struct super_block *sb, int type), 1389 unsigned long t, unsigned long *timeo, 1390 unsigned int *new_timeo) 1391 { 1392 if (t >= *timeo) { 1393 int error = fxn(sdp->sd_vfs, 0); 1394 quotad_error(sdp, msg, error); 1395 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1396 } else { 1397 *timeo -= t; 1398 } 1399 } 1400 1401 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1402 { 1403 struct gfs2_inode *ip; 1404 1405 while(1) { 1406 ip = NULL; 1407 spin_lock(&sdp->sd_trunc_lock); 1408 if (!list_empty(&sdp->sd_trunc_list)) { 1409 ip = list_entry(sdp->sd_trunc_list.next, 1410 struct gfs2_inode, i_trunc_list); 1411 list_del_init(&ip->i_trunc_list); 1412 } 1413 spin_unlock(&sdp->sd_trunc_lock); 1414 if (ip == NULL) 1415 return; 1416 gfs2_glock_finish_truncate(ip); 1417 } 1418 } 1419 1420 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1421 if (!sdp->sd_statfs_force_sync) { 1422 sdp->sd_statfs_force_sync = 1; 1423 wake_up(&sdp->sd_quota_wait); 1424 } 1425 } 1426 1427 1428 /** 1429 * gfs2_quotad - Write cached quota changes into the quota file 1430 * @sdp: Pointer to GFS2 superblock 1431 * 1432 */ 1433 1434 int gfs2_quotad(void *data) 1435 { 1436 struct gfs2_sbd *sdp = data; 1437 struct gfs2_tune *tune = &sdp->sd_tune; 1438 unsigned long statfs_timeo = 0; 1439 unsigned long quotad_timeo = 0; 1440 unsigned long t = 0; 1441 DEFINE_WAIT(wait); 1442 int empty; 1443 1444 while (!kthread_should_stop()) { 1445 1446 /* Update the master statfs file */ 1447 if (sdp->sd_statfs_force_sync) { 1448 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1449 quotad_error(sdp, "statfs", error); 1450 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1451 } 1452 else 1453 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1454 &statfs_timeo, 1455 &tune->gt_statfs_quantum); 1456 1457 /* Update quota file */ 1458 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t, 1459 "ad_timeo, &tune->gt_quota_quantum); 1460 1461 /* Check for & recover partially truncated inodes */ 1462 quotad_check_trunc_list(sdp); 1463 1464 try_to_freeze(); 1465 1466 t = min(quotad_timeo, statfs_timeo); 1467 1468 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1469 spin_lock(&sdp->sd_trunc_lock); 1470 empty = list_empty(&sdp->sd_trunc_list); 1471 spin_unlock(&sdp->sd_trunc_lock); 1472 if (empty && !sdp->sd_statfs_force_sync) 1473 t -= schedule_timeout(t); 1474 else 1475 t = 0; 1476 finish_wait(&sdp->sd_quota_wait, &wait); 1477 } 1478 1479 return 0; 1480 } 1481 1482 static int gfs2_quota_get_xstate(struct super_block *sb, 1483 struct fs_quota_stat *fqs) 1484 { 1485 struct gfs2_sbd *sdp = sb->s_fs_info; 1486 1487 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1488 fqs->qs_version = FS_QSTAT_VERSION; 1489 1490 switch (sdp->sd_args.ar_quota) { 1491 case GFS2_QUOTA_ON: 1492 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1493 /*FALLTHRU*/ 1494 case GFS2_QUOTA_ACCOUNT: 1495 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1496 break; 1497 case GFS2_QUOTA_OFF: 1498 break; 1499 } 1500 1501 if (sdp->sd_quota_inode) { 1502 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1503 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1504 } 1505 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1506 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1507 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru); 1508 return 0; 1509 } 1510 1511 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, 1512 struct fs_disk_quota *fdq) 1513 { 1514 struct gfs2_sbd *sdp = sb->s_fs_info; 1515 struct gfs2_quota_lvb *qlvb; 1516 struct gfs2_quota_data *qd; 1517 struct gfs2_holder q_gh; 1518 int error; 1519 1520 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1521 1522 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1523 return -ESRCH; /* Crazy XFS error code */ 1524 1525 if ((qid.type != USRQUOTA) && 1526 (qid.type != GRPQUOTA)) 1527 return -EINVAL; 1528 1529 error = qd_get(sdp, qid, &qd); 1530 if (error) 1531 return error; 1532 error = do_glock(qd, FORCE, &q_gh); 1533 if (error) 1534 goto out; 1535 1536 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1537 fdq->d_version = FS_DQUOT_VERSION; 1538 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1539 fdq->d_id = from_kqid_munged(current_user_ns(), qid); 1540 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; 1541 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; 1542 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift; 1543 1544 gfs2_glock_dq_uninit(&q_gh); 1545 out: 1546 qd_put(qd); 1547 return error; 1548 } 1549 1550 /* GFS2 only supports a subset of the XFS fields */ 1551 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) 1552 1553 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, 1554 struct fs_disk_quota *fdq) 1555 { 1556 struct gfs2_sbd *sdp = sb->s_fs_info; 1557 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1558 struct gfs2_quota_data *qd; 1559 struct gfs2_holder q_gh, i_gh; 1560 unsigned int data_blocks, ind_blocks; 1561 unsigned int blocks = 0; 1562 int alloc_required; 1563 loff_t offset; 1564 int error; 1565 1566 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1567 return -ESRCH; /* Crazy XFS error code */ 1568 1569 if ((qid.type != USRQUOTA) && 1570 (qid.type != GRPQUOTA)) 1571 return -EINVAL; 1572 1573 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1574 return -EINVAL; 1575 1576 error = qd_get(sdp, qid, &qd); 1577 if (error) 1578 return error; 1579 1580 error = gfs2_rs_alloc(ip); 1581 if (error) 1582 goto out_put; 1583 1584 mutex_lock(&ip->i_inode.i_mutex); 1585 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1586 if (error) 1587 goto out_unlockput; 1588 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1589 if (error) 1590 goto out_q; 1591 1592 /* Check for existing entry, if none then alloc new blocks */ 1593 error = update_qd(sdp, qd); 1594 if (error) 1595 goto out_i; 1596 1597 /* If nothing has changed, this is a no-op */ 1598 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1599 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1600 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1601 1602 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1603 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1604 fdq->d_fieldmask ^= FS_DQ_BHARD; 1605 1606 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1607 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1608 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1609 1610 if (fdq->d_fieldmask == 0) 1611 goto out_i; 1612 1613 offset = qd2offset(qd); 1614 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1615 if (gfs2_is_stuffed(ip)) 1616 alloc_required = 1; 1617 if (alloc_required) { 1618 struct gfs2_alloc_parms ap = { .aflags = 0, }; 1619 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1620 &data_blocks, &ind_blocks); 1621 blocks = 1 + data_blocks + ind_blocks; 1622 ap.target = blocks; 1623 error = gfs2_inplace_reserve(ip, &ap); 1624 if (error) 1625 goto out_i; 1626 blocks += gfs2_rg_blocks(ip, blocks); 1627 } 1628 1629 /* Some quotas span block boundaries and can update two blocks, 1630 adding an extra block to the transaction to handle such quotas */ 1631 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1632 if (error) 1633 goto out_release; 1634 1635 /* Apply changes */ 1636 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1637 1638 gfs2_trans_end(sdp); 1639 out_release: 1640 if (alloc_required) 1641 gfs2_inplace_release(ip); 1642 out_i: 1643 gfs2_glock_dq_uninit(&i_gh); 1644 out_q: 1645 gfs2_glock_dq_uninit(&q_gh); 1646 out_unlockput: 1647 mutex_unlock(&ip->i_inode.i_mutex); 1648 out_put: 1649 qd_put(qd); 1650 return error; 1651 } 1652 1653 const struct quotactl_ops gfs2_quotactl_ops = { 1654 .quota_sync = gfs2_quota_sync, 1655 .get_xstate = gfs2_quota_get_xstate, 1656 .get_dqblk = gfs2_get_dqblk, 1657 .set_dqblk = gfs2_set_dqblk, 1658 }; 1659