1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 5 */ 6 7 /* 8 * Quota change tags are associated with each transaction that allocates or 9 * deallocates space. Those changes are accumulated locally to each node (in a 10 * per-node file) and then are periodically synced to the quota file. This 11 * avoids the bottleneck of constantly touching the quota file, but introduces 12 * fuzziness in the current usage value of IDs that are being used on different 13 * nodes in the cluster simultaneously. So, it is possible for a user on 14 * multiple nodes to overrun their quota, but that overrun is controlable. 15 * Since quota tags are part of transactions, there is no need for a quota check 16 * program to be run on node crashes or anything like that. 17 * 18 * There are couple of knobs that let the administrator manage the quota 19 * fuzziness. "quota_quantum" sets the maximum time a quota change can be 20 * sitting on one node before being synced to the quota file. (The default is 21 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency 22 * of quota file syncs increases as the user moves closer to their limit. The 23 * more frequent the syncs, the more accurate the quota enforcement, but that 24 * means that there is more contention between the nodes for the quota file. 25 * The default value is one. This sets the maximum theoretical quota overrun 26 * (with infinite node with infinite bandwidth) to twice the user's limit. (In 27 * practice, the maximum overrun you see should be much less.) A "quota_scale" 28 * number greater than one makes quota syncs more frequent and reduces the 29 * maximum overrun. Numbers less than one (but greater than zero) make quota 30 * syncs less frequent. 31 * 32 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of 33 * the quota file, so it is not being constantly read. 34 */ 35 36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 37 38 #include <linux/sched.h> 39 #include <linux/slab.h> 40 #include <linux/mm.h> 41 #include <linux/spinlock.h> 42 #include <linux/completion.h> 43 #include <linux/buffer_head.h> 44 #include <linux/sort.h> 45 #include <linux/fs.h> 46 #include <linux/bio.h> 47 #include <linux/gfs2_ondisk.h> 48 #include <linux/kthread.h> 49 #include <linux/freezer.h> 50 #include <linux/quota.h> 51 #include <linux/dqblk_xfs.h> 52 #include <linux/lockref.h> 53 #include <linux/list_lru.h> 54 #include <linux/rcupdate.h> 55 #include <linux/rculist_bl.h> 56 #include <linux/bit_spinlock.h> 57 #include <linux/jhash.h> 58 #include <linux/vmalloc.h> 59 60 #include "gfs2.h" 61 #include "incore.h" 62 #include "bmap.h" 63 #include "glock.h" 64 #include "glops.h" 65 #include "log.h" 66 #include "meta_io.h" 67 #include "quota.h" 68 #include "rgrp.h" 69 #include "super.h" 70 #include "trans.h" 71 #include "inode.h" 72 #include "util.h" 73 74 #define GFS2_QD_HASH_SHIFT 12 75 #define GFS2_QD_HASH_SIZE BIT(GFS2_QD_HASH_SHIFT) 76 #define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1) 77 78 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */ 79 /* -> sd_bitmap_lock */ 80 static DEFINE_SPINLOCK(qd_lock); 81 struct list_lru gfs2_qd_lru; 82 83 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE]; 84 85 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp, 86 const struct kqid qid) 87 { 88 unsigned int h; 89 90 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0); 91 h = jhash(&qid, sizeof(struct kqid), h); 92 93 return h & GFS2_QD_HASH_MASK; 94 } 95 96 static inline void spin_lock_bucket(unsigned int hash) 97 { 98 hlist_bl_lock(&qd_hash_table[hash]); 99 } 100 101 static inline void spin_unlock_bucket(unsigned int hash) 102 { 103 hlist_bl_unlock(&qd_hash_table[hash]); 104 } 105 106 static void gfs2_qd_dealloc(struct rcu_head *rcu) 107 { 108 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu); 109 kmem_cache_free(gfs2_quotad_cachep, qd); 110 } 111 112 static void gfs2_qd_dispose(struct list_head *list) 113 { 114 struct gfs2_quota_data *qd; 115 struct gfs2_sbd *sdp; 116 117 while (!list_empty(list)) { 118 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru); 119 sdp = qd->qd_gl->gl_name.ln_sbd; 120 121 list_del(&qd->qd_lru); 122 123 /* Free from the filesystem-specific list */ 124 spin_lock(&qd_lock); 125 list_del(&qd->qd_list); 126 spin_unlock(&qd_lock); 127 128 spin_lock_bucket(qd->qd_hash); 129 hlist_bl_del_rcu(&qd->qd_hlist); 130 spin_unlock_bucket(qd->qd_hash); 131 132 gfs2_assert_warn(sdp, !qd->qd_change); 133 gfs2_assert_warn(sdp, !qd->qd_slot_count); 134 gfs2_assert_warn(sdp, !qd->qd_bh_count); 135 136 gfs2_glock_put(qd->qd_gl); 137 atomic_dec(&sdp->sd_quota_count); 138 139 /* Delete it from the common reclaim list */ 140 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); 141 } 142 } 143 144 145 static enum lru_status gfs2_qd_isolate(struct list_head *item, 146 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg) 147 { 148 struct list_head *dispose = arg; 149 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru); 150 151 if (!spin_trylock(&qd->qd_lockref.lock)) 152 return LRU_SKIP; 153 154 if (qd->qd_lockref.count == 0) { 155 lockref_mark_dead(&qd->qd_lockref); 156 list_lru_isolate_move(lru, &qd->qd_lru, dispose); 157 } 158 159 spin_unlock(&qd->qd_lockref.lock); 160 return LRU_REMOVED; 161 } 162 163 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink, 164 struct shrink_control *sc) 165 { 166 LIST_HEAD(dispose); 167 unsigned long freed; 168 169 if (!(sc->gfp_mask & __GFP_FS)) 170 return SHRINK_STOP; 171 172 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc, 173 gfs2_qd_isolate, &dispose); 174 175 gfs2_qd_dispose(&dispose); 176 177 return freed; 178 } 179 180 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink, 181 struct shrink_control *sc) 182 { 183 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc)); 184 } 185 186 struct shrinker gfs2_qd_shrinker = { 187 .count_objects = gfs2_qd_shrink_count, 188 .scan_objects = gfs2_qd_shrink_scan, 189 .seeks = DEFAULT_SEEKS, 190 .flags = SHRINKER_NUMA_AWARE, 191 }; 192 193 194 static u64 qd2index(struct gfs2_quota_data *qd) 195 { 196 struct kqid qid = qd->qd_id; 197 return (2 * (u64)from_kqid(&init_user_ns, qid)) + 198 ((qid.type == USRQUOTA) ? 0 : 1); 199 } 200 201 static u64 qd2offset(struct gfs2_quota_data *qd) 202 { 203 u64 offset; 204 205 offset = qd2index(qd); 206 offset *= sizeof(struct gfs2_quota); 207 208 return offset; 209 } 210 211 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid) 212 { 213 struct gfs2_quota_data *qd; 214 int error; 215 216 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 217 if (!qd) 218 return NULL; 219 220 qd->qd_sbd = sdp; 221 qd->qd_lockref.count = 1; 222 spin_lock_init(&qd->qd_lockref.lock); 223 qd->qd_id = qid; 224 qd->qd_slot = -1; 225 INIT_LIST_HEAD(&qd->qd_lru); 226 qd->qd_hash = hash; 227 228 error = gfs2_glock_get(sdp, qd2index(qd), 229 &gfs2_quota_glops, CREATE, &qd->qd_gl); 230 if (error) 231 goto fail; 232 233 return qd; 234 235 fail: 236 kmem_cache_free(gfs2_quotad_cachep, qd); 237 return NULL; 238 } 239 240 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash, 241 const struct gfs2_sbd *sdp, 242 struct kqid qid) 243 { 244 struct gfs2_quota_data *qd; 245 struct hlist_bl_node *h; 246 247 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) { 248 if (!qid_eq(qd->qd_id, qid)) 249 continue; 250 if (qd->qd_sbd != sdp) 251 continue; 252 if (lockref_get_not_dead(&qd->qd_lockref)) { 253 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 254 return qd; 255 } 256 } 257 258 return NULL; 259 } 260 261 262 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid, 263 struct gfs2_quota_data **qdp) 264 { 265 struct gfs2_quota_data *qd, *new_qd; 266 unsigned int hash = gfs2_qd_hash(sdp, qid); 267 268 rcu_read_lock(); 269 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); 270 rcu_read_unlock(); 271 272 if (qd) 273 return 0; 274 275 new_qd = qd_alloc(hash, sdp, qid); 276 if (!new_qd) 277 return -ENOMEM; 278 279 spin_lock(&qd_lock); 280 spin_lock_bucket(hash); 281 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid); 282 if (qd == NULL) { 283 *qdp = new_qd; 284 list_add(&new_qd->qd_list, &sdp->sd_quota_list); 285 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]); 286 atomic_inc(&sdp->sd_quota_count); 287 } 288 spin_unlock_bucket(hash); 289 spin_unlock(&qd_lock); 290 291 if (qd) { 292 gfs2_glock_put(new_qd->qd_gl); 293 kmem_cache_free(gfs2_quotad_cachep, new_qd); 294 } 295 296 return 0; 297 } 298 299 300 static void qd_hold(struct gfs2_quota_data *qd) 301 { 302 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 303 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref)); 304 lockref_get(&qd->qd_lockref); 305 } 306 307 static void qd_put(struct gfs2_quota_data *qd) 308 { 309 if (lockref_put_or_lock(&qd->qd_lockref)) 310 return; 311 312 qd->qd_lockref.count = 0; 313 list_lru_add(&gfs2_qd_lru, &qd->qd_lru); 314 spin_unlock(&qd->qd_lockref.lock); 315 316 } 317 318 static int slot_get(struct gfs2_quota_data *qd) 319 { 320 struct gfs2_sbd *sdp = qd->qd_sbd; 321 unsigned int bit; 322 int error = 0; 323 324 spin_lock(&sdp->sd_bitmap_lock); 325 if (qd->qd_slot_count != 0) 326 goto out; 327 328 error = -ENOSPC; 329 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots); 330 if (bit < sdp->sd_quota_slots) { 331 set_bit(bit, sdp->sd_quota_bitmap); 332 qd->qd_slot = bit; 333 error = 0; 334 out: 335 qd->qd_slot_count++; 336 } 337 spin_unlock(&sdp->sd_bitmap_lock); 338 339 return error; 340 } 341 342 static void slot_hold(struct gfs2_quota_data *qd) 343 { 344 struct gfs2_sbd *sdp = qd->qd_sbd; 345 346 spin_lock(&sdp->sd_bitmap_lock); 347 gfs2_assert(sdp, qd->qd_slot_count); 348 qd->qd_slot_count++; 349 spin_unlock(&sdp->sd_bitmap_lock); 350 } 351 352 static void slot_put(struct gfs2_quota_data *qd) 353 { 354 struct gfs2_sbd *sdp = qd->qd_sbd; 355 356 spin_lock(&sdp->sd_bitmap_lock); 357 gfs2_assert(sdp, qd->qd_slot_count); 358 if (!--qd->qd_slot_count) { 359 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap)); 360 qd->qd_slot = -1; 361 } 362 spin_unlock(&sdp->sd_bitmap_lock); 363 } 364 365 static int bh_get(struct gfs2_quota_data *qd) 366 { 367 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 368 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 369 unsigned int block, offset; 370 struct buffer_head *bh; 371 int error; 372 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 373 374 mutex_lock(&sdp->sd_quota_mutex); 375 376 if (qd->qd_bh_count++) { 377 mutex_unlock(&sdp->sd_quota_mutex); 378 return 0; 379 } 380 381 block = qd->qd_slot / sdp->sd_qc_per_block; 382 offset = qd->qd_slot % sdp->sd_qc_per_block; 383 384 bh_map.b_size = BIT(ip->i_inode.i_blkbits); 385 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 386 if (error) 387 goto fail; 388 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh); 389 if (error) 390 goto fail; 391 error = -EIO; 392 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 393 goto fail_brelse; 394 395 qd->qd_bh = bh; 396 qd->qd_bh_qc = (struct gfs2_quota_change *) 397 (bh->b_data + sizeof(struct gfs2_meta_header) + 398 offset * sizeof(struct gfs2_quota_change)); 399 400 mutex_unlock(&sdp->sd_quota_mutex); 401 402 return 0; 403 404 fail_brelse: 405 brelse(bh); 406 fail: 407 qd->qd_bh_count--; 408 mutex_unlock(&sdp->sd_quota_mutex); 409 return error; 410 } 411 412 static void bh_put(struct gfs2_quota_data *qd) 413 { 414 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 415 416 mutex_lock(&sdp->sd_quota_mutex); 417 gfs2_assert(sdp, qd->qd_bh_count); 418 if (!--qd->qd_bh_count) { 419 brelse(qd->qd_bh); 420 qd->qd_bh = NULL; 421 qd->qd_bh_qc = NULL; 422 } 423 mutex_unlock(&sdp->sd_quota_mutex); 424 } 425 426 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd, 427 u64 *sync_gen) 428 { 429 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 430 !test_bit(QDF_CHANGE, &qd->qd_flags) || 431 (sync_gen && (qd->qd_sync_gen >= *sync_gen))) 432 return 0; 433 434 if (!lockref_get_not_dead(&qd->qd_lockref)) 435 return 0; 436 437 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 438 set_bit(QDF_LOCKED, &qd->qd_flags); 439 qd->qd_change_sync = qd->qd_change; 440 slot_hold(qd); 441 return 1; 442 } 443 444 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 445 { 446 struct gfs2_quota_data *qd = NULL; 447 int error; 448 int found = 0; 449 450 *qdp = NULL; 451 452 if (sb_rdonly(sdp->sd_vfs)) 453 return 0; 454 455 spin_lock(&qd_lock); 456 457 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 458 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen); 459 if (found) 460 break; 461 } 462 463 if (!found) 464 qd = NULL; 465 466 spin_unlock(&qd_lock); 467 468 if (qd) { 469 gfs2_assert_warn(sdp, qd->qd_change_sync); 470 error = bh_get(qd); 471 if (error) { 472 clear_bit(QDF_LOCKED, &qd->qd_flags); 473 slot_put(qd); 474 qd_put(qd); 475 return error; 476 } 477 } 478 479 *qdp = qd; 480 481 return 0; 482 } 483 484 static void qd_unlock(struct gfs2_quota_data *qd) 485 { 486 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd, 487 test_bit(QDF_LOCKED, &qd->qd_flags)); 488 clear_bit(QDF_LOCKED, &qd->qd_flags); 489 bh_put(qd); 490 slot_put(qd); 491 qd_put(qd); 492 } 493 494 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid, 495 struct gfs2_quota_data **qdp) 496 { 497 int error; 498 499 error = qd_get(sdp, qid, qdp); 500 if (error) 501 return error; 502 503 error = slot_get(*qdp); 504 if (error) 505 goto fail; 506 507 error = bh_get(*qdp); 508 if (error) 509 goto fail_slot; 510 511 return 0; 512 513 fail_slot: 514 slot_put(*qdp); 515 fail: 516 qd_put(*qdp); 517 return error; 518 } 519 520 static void qdsb_put(struct gfs2_quota_data *qd) 521 { 522 bh_put(qd); 523 slot_put(qd); 524 qd_put(qd); 525 } 526 527 /** 528 * gfs2_qa_get - make sure we have a quota allocations data structure, 529 * if necessary 530 * @ip: the inode for this reservation 531 */ 532 int gfs2_qa_get(struct gfs2_inode *ip) 533 { 534 int error = 0; 535 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 536 537 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 538 return 0; 539 540 down_write(&ip->i_rw_mutex); 541 if (ip->i_qadata == NULL) { 542 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS); 543 if (!ip->i_qadata) { 544 error = -ENOMEM; 545 goto out; 546 } 547 } 548 ip->i_qadata->qa_ref++; 549 out: 550 up_write(&ip->i_rw_mutex); 551 return error; 552 } 553 554 void gfs2_qa_put(struct gfs2_inode *ip) 555 { 556 down_write(&ip->i_rw_mutex); 557 if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) { 558 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata); 559 ip->i_qadata = NULL; 560 } 561 up_write(&ip->i_rw_mutex); 562 } 563 564 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 565 { 566 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 567 struct gfs2_quota_data **qd; 568 int error; 569 570 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 571 return 0; 572 573 error = gfs2_qa_get(ip); 574 if (error) 575 return error; 576 577 qd = ip->i_qadata->qa_qd; 578 579 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) || 580 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) { 581 error = -EIO; 582 goto out; 583 } 584 585 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd); 586 if (error) 587 goto out_unhold; 588 ip->i_qadata->qa_qd_num++; 589 qd++; 590 591 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd); 592 if (error) 593 goto out_unhold; 594 ip->i_qadata->qa_qd_num++; 595 qd++; 596 597 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) && 598 !uid_eq(uid, ip->i_inode.i_uid)) { 599 error = qdsb_get(sdp, make_kqid_uid(uid), qd); 600 if (error) 601 goto out_unhold; 602 ip->i_qadata->qa_qd_num++; 603 qd++; 604 } 605 606 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) && 607 !gid_eq(gid, ip->i_inode.i_gid)) { 608 error = qdsb_get(sdp, make_kqid_gid(gid), qd); 609 if (error) 610 goto out_unhold; 611 ip->i_qadata->qa_qd_num++; 612 qd++; 613 } 614 615 out_unhold: 616 if (error) 617 gfs2_quota_unhold(ip); 618 out: 619 return error; 620 } 621 622 void gfs2_quota_unhold(struct gfs2_inode *ip) 623 { 624 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 625 u32 x; 626 627 if (ip->i_qadata == NULL) 628 return; 629 630 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 631 632 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 633 qdsb_put(ip->i_qadata->qa_qd[x]); 634 ip->i_qadata->qa_qd[x] = NULL; 635 } 636 ip->i_qadata->qa_qd_num = 0; 637 gfs2_qa_put(ip); 638 } 639 640 static int sort_qd(const void *a, const void *b) 641 { 642 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 643 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 644 645 if (qid_lt(qd_a->qd_id, qd_b->qd_id)) 646 return -1; 647 if (qid_lt(qd_b->qd_id, qd_a->qd_id)) 648 return 1; 649 return 0; 650 } 651 652 static void do_qc(struct gfs2_quota_data *qd, s64 change) 653 { 654 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 655 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 656 struct gfs2_quota_change *qc = qd->qd_bh_qc; 657 s64 x; 658 659 mutex_lock(&sdp->sd_quota_mutex); 660 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh); 661 662 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 663 qc->qc_change = 0; 664 qc->qc_flags = 0; 665 if (qd->qd_id.type == USRQUOTA) 666 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 667 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id)); 668 } 669 670 x = be64_to_cpu(qc->qc_change) + change; 671 qc->qc_change = cpu_to_be64(x); 672 673 spin_lock(&qd_lock); 674 qd->qd_change = x; 675 spin_unlock(&qd_lock); 676 677 if (!x) { 678 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 679 clear_bit(QDF_CHANGE, &qd->qd_flags); 680 qc->qc_flags = 0; 681 qc->qc_id = 0; 682 slot_put(qd); 683 qd_put(qd); 684 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 685 qd_hold(qd); 686 slot_hold(qd); 687 } 688 689 if (change < 0) /* Reset quiet flag if we freed some blocks */ 690 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); 691 mutex_unlock(&sdp->sd_quota_mutex); 692 } 693 694 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index, 695 unsigned off, void *buf, unsigned bytes) 696 { 697 struct inode *inode = &ip->i_inode; 698 struct gfs2_sbd *sdp = GFS2_SB(inode); 699 struct address_space *mapping = inode->i_mapping; 700 struct page *page; 701 struct buffer_head *bh; 702 void *kaddr; 703 u64 blk; 704 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0; 705 unsigned to_write = bytes, pg_off = off; 706 int done = 0; 707 708 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift); 709 boff = off % bsize; 710 711 page = find_or_create_page(mapping, index, GFP_NOFS); 712 if (!page) 713 return -ENOMEM; 714 if (!page_has_buffers(page)) 715 create_empty_buffers(page, bsize, 0); 716 717 bh = page_buffers(page); 718 while (!done) { 719 /* Find the beginning block within the page */ 720 if (pg_off >= ((bnum * bsize) + bsize)) { 721 bh = bh->b_this_page; 722 bnum++; 723 blk++; 724 continue; 725 } 726 if (!buffer_mapped(bh)) { 727 gfs2_block_map(inode, blk, bh, 1); 728 if (!buffer_mapped(bh)) 729 goto unlock_out; 730 /* If it's a newly allocated disk block, zero it */ 731 if (buffer_new(bh)) 732 zero_user(page, bnum * bsize, bh->b_size); 733 } 734 if (PageUptodate(page)) 735 set_buffer_uptodate(bh); 736 if (!buffer_uptodate(bh)) { 737 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh); 738 wait_on_buffer(bh); 739 if (!buffer_uptodate(bh)) 740 goto unlock_out; 741 } 742 if (gfs2_is_jdata(ip)) 743 gfs2_trans_add_data(ip->i_gl, bh); 744 else 745 gfs2_ordered_add_inode(ip); 746 747 /* If we need to write to the next block as well */ 748 if (to_write > (bsize - boff)) { 749 pg_off += (bsize - boff); 750 to_write -= (bsize - boff); 751 boff = pg_off % bsize; 752 continue; 753 } 754 done = 1; 755 } 756 757 /* Write to the page, now that we have setup the buffer(s) */ 758 kaddr = kmap_atomic(page); 759 memcpy(kaddr + off, buf, bytes); 760 flush_dcache_page(page); 761 kunmap_atomic(kaddr); 762 unlock_page(page); 763 put_page(page); 764 765 return 0; 766 767 unlock_out: 768 unlock_page(page); 769 put_page(page); 770 return -EIO; 771 } 772 773 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp, 774 loff_t loc) 775 { 776 unsigned long pg_beg; 777 unsigned pg_off, nbytes, overflow = 0; 778 int pg_oflow = 0, error; 779 void *ptr; 780 781 nbytes = sizeof(struct gfs2_quota); 782 783 pg_beg = loc >> PAGE_SHIFT; 784 pg_off = offset_in_page(loc); 785 786 /* If the quota straddles a page boundary, split the write in two */ 787 if ((pg_off + nbytes) > PAGE_SIZE) { 788 pg_oflow = 1; 789 overflow = (pg_off + nbytes) - PAGE_SIZE; 790 } 791 792 ptr = qp; 793 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr, 794 nbytes - overflow); 795 /* If there's an overflow, write the remaining bytes to the next page */ 796 if (!error && pg_oflow) 797 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0, 798 ptr + nbytes - overflow, 799 overflow); 800 return error; 801 } 802 803 /** 804 * gfs2_adjust_quota - adjust record of current block usage 805 * @ip: The quota inode 806 * @loc: Offset of the entry in the quota file 807 * @change: The amount of usage change to record 808 * @qd: The quota data 809 * @fdq: The updated limits to record 810 * 811 * This function was mostly borrowed from gfs2_block_truncate_page which was 812 * in turn mostly borrowed from ext3 813 * 814 * Returns: 0 or -ve on error 815 */ 816 817 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 818 s64 change, struct gfs2_quota_data *qd, 819 struct qc_dqblk *fdq) 820 { 821 struct inode *inode = &ip->i_inode; 822 struct gfs2_sbd *sdp = GFS2_SB(inode); 823 struct gfs2_quota q; 824 int err; 825 u64 size; 826 827 if (gfs2_is_stuffed(ip)) { 828 err = gfs2_unstuff_dinode(ip, NULL); 829 if (err) 830 return err; 831 } 832 833 memset(&q, 0, sizeof(struct gfs2_quota)); 834 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); 835 if (err < 0) 836 return err; 837 838 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */ 839 err = -EIO; 840 be64_add_cpu(&q.qu_value, change); 841 if (((s64)be64_to_cpu(q.qu_value)) < 0) 842 q.qu_value = 0; /* Never go negative on quota usage */ 843 qd->qd_qb.qb_value = q.qu_value; 844 if (fdq) { 845 if (fdq->d_fieldmask & QC_SPC_SOFT) { 846 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift); 847 qd->qd_qb.qb_warn = q.qu_warn; 848 } 849 if (fdq->d_fieldmask & QC_SPC_HARD) { 850 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift); 851 qd->qd_qb.qb_limit = q.qu_limit; 852 } 853 if (fdq->d_fieldmask & QC_SPACE) { 854 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift); 855 qd->qd_qb.qb_value = q.qu_value; 856 } 857 } 858 859 err = gfs2_write_disk_quota(ip, &q, loc); 860 if (!err) { 861 size = loc + sizeof(struct gfs2_quota); 862 if (size > inode->i_size) 863 i_size_write(inode, size); 864 inode->i_mtime = inode->i_atime = current_time(inode); 865 mark_inode_dirty(inode); 866 set_bit(QDF_REFRESH, &qd->qd_flags); 867 } 868 869 return err; 870 } 871 872 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 873 { 874 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd; 875 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 876 struct gfs2_alloc_parms ap = { .aflags = 0, }; 877 unsigned int data_blocks, ind_blocks; 878 struct gfs2_holder *ghs, i_gh; 879 unsigned int qx, x; 880 struct gfs2_quota_data *qd; 881 unsigned reserved; 882 loff_t offset; 883 unsigned int nalloc = 0, blocks; 884 int error; 885 886 error = gfs2_qa_get(ip); 887 if (error) 888 return error; 889 890 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 891 &data_blocks, &ind_blocks); 892 893 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 894 if (!ghs) { 895 error = -ENOMEM; 896 goto out; 897 } 898 899 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 900 inode_lock(&ip->i_inode); 901 for (qx = 0; qx < num_qd; qx++) { 902 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 903 GL_NOCACHE, &ghs[qx]); 904 if (error) 905 goto out_dq; 906 } 907 908 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 909 if (error) 910 goto out_dq; 911 912 for (x = 0; x < num_qd; x++) { 913 offset = qd2offset(qda[x]); 914 if (gfs2_write_alloc_required(ip, offset, 915 sizeof(struct gfs2_quota))) 916 nalloc++; 917 } 918 919 /* 920 * 1 blk for unstuffing inode if stuffed. We add this extra 921 * block to the reservation unconditionally. If the inode 922 * doesn't need unstuffing, the block will be released to the 923 * rgrp since it won't be allocated during the transaction 924 */ 925 /* +3 in the end for unstuffing block, inode size update block 926 * and another block in case quota straddles page boundary and 927 * two blocks need to be updated instead of 1 */ 928 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 929 930 reserved = 1 + (nalloc * (data_blocks + ind_blocks)); 931 ap.target = reserved; 932 error = gfs2_inplace_reserve(ip, &ap); 933 if (error) 934 goto out_alloc; 935 936 if (nalloc) 937 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; 938 939 error = gfs2_trans_begin(sdp, blocks, 0); 940 if (error) 941 goto out_ipres; 942 943 for (x = 0; x < num_qd; x++) { 944 qd = qda[x]; 945 offset = qd2offset(qd); 946 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 947 if (error) 948 goto out_end_trans; 949 950 do_qc(qd, -qd->qd_change_sync); 951 set_bit(QDF_REFRESH, &qd->qd_flags); 952 } 953 954 error = 0; 955 956 out_end_trans: 957 gfs2_trans_end(sdp); 958 out_ipres: 959 gfs2_inplace_release(ip); 960 out_alloc: 961 gfs2_glock_dq_uninit(&i_gh); 962 out_dq: 963 while (qx--) 964 gfs2_glock_dq_uninit(&ghs[qx]); 965 inode_unlock(&ip->i_inode); 966 kfree(ghs); 967 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, 968 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC); 969 out: 970 gfs2_qa_put(ip); 971 return error; 972 } 973 974 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 975 { 976 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 977 struct gfs2_quota q; 978 struct gfs2_quota_lvb *qlvb; 979 loff_t pos; 980 int error; 981 982 memset(&q, 0, sizeof(struct gfs2_quota)); 983 pos = qd2offset(qd); 984 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); 985 if (error < 0) 986 return error; 987 988 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 989 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 990 qlvb->__pad = 0; 991 qlvb->qb_limit = q.qu_limit; 992 qlvb->qb_warn = q.qu_warn; 993 qlvb->qb_value = q.qu_value; 994 qd->qd_qb = *qlvb; 995 996 return 0; 997 } 998 999 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 1000 struct gfs2_holder *q_gh) 1001 { 1002 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 1003 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1004 struct gfs2_holder i_gh; 1005 int error; 1006 1007 restart: 1008 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 1009 if (error) 1010 return error; 1011 1012 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 1013 force_refresh = FORCE; 1014 1015 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1016 1017 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 1018 gfs2_glock_dq_uninit(q_gh); 1019 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 1020 GL_NOCACHE, q_gh); 1021 if (error) 1022 return error; 1023 1024 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1025 if (error) 1026 goto fail; 1027 1028 error = update_qd(sdp, qd); 1029 if (error) 1030 goto fail_gunlock; 1031 1032 gfs2_glock_dq_uninit(&i_gh); 1033 gfs2_glock_dq_uninit(q_gh); 1034 force_refresh = 0; 1035 goto restart; 1036 } 1037 1038 return 0; 1039 1040 fail_gunlock: 1041 gfs2_glock_dq_uninit(&i_gh); 1042 fail: 1043 gfs2_glock_dq_uninit(q_gh); 1044 return error; 1045 } 1046 1047 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 1048 { 1049 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1050 struct gfs2_quota_data *qd; 1051 u32 x; 1052 int error = 0; 1053 1054 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1055 return 0; 1056 1057 error = gfs2_quota_hold(ip, uid, gid); 1058 if (error) 1059 return error; 1060 1061 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num, 1062 sizeof(struct gfs2_quota_data *), sort_qd, NULL); 1063 1064 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1065 qd = ip->i_qadata->qa_qd[x]; 1066 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]); 1067 if (error) 1068 break; 1069 } 1070 1071 if (!error) 1072 set_bit(GIF_QD_LOCKED, &ip->i_flags); 1073 else { 1074 while (x--) 1075 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); 1076 gfs2_quota_unhold(ip); 1077 } 1078 1079 return error; 1080 } 1081 1082 static int need_sync(struct gfs2_quota_data *qd) 1083 { 1084 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 1085 struct gfs2_tune *gt = &sdp->sd_tune; 1086 s64 value; 1087 unsigned int num, den; 1088 int do_sync = 1; 1089 1090 if (!qd->qd_qb.qb_limit) 1091 return 0; 1092 1093 spin_lock(&qd_lock); 1094 value = qd->qd_change; 1095 spin_unlock(&qd_lock); 1096 1097 spin_lock(>->gt_spin); 1098 num = gt->gt_quota_scale_num; 1099 den = gt->gt_quota_scale_den; 1100 spin_unlock(>->gt_spin); 1101 1102 if (value < 0) 1103 do_sync = 0; 1104 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 1105 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1106 do_sync = 0; 1107 else { 1108 value *= gfs2_jindex_size(sdp) * num; 1109 value = div_s64(value, den); 1110 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 1111 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1112 do_sync = 0; 1113 } 1114 1115 return do_sync; 1116 } 1117 1118 void gfs2_quota_unlock(struct gfs2_inode *ip) 1119 { 1120 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1121 struct gfs2_quota_data *qda[4]; 1122 unsigned int count = 0; 1123 u32 x; 1124 int found; 1125 1126 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1127 return; 1128 1129 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1130 struct gfs2_quota_data *qd; 1131 int sync; 1132 1133 qd = ip->i_qadata->qa_qd[x]; 1134 sync = need_sync(qd); 1135 1136 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); 1137 if (!sync) 1138 continue; 1139 1140 spin_lock(&qd_lock); 1141 found = qd_check_sync(sdp, qd, NULL); 1142 spin_unlock(&qd_lock); 1143 1144 if (!found) 1145 continue; 1146 1147 gfs2_assert_warn(sdp, qd->qd_change_sync); 1148 if (bh_get(qd)) { 1149 clear_bit(QDF_LOCKED, &qd->qd_flags); 1150 slot_put(qd); 1151 qd_put(qd); 1152 continue; 1153 } 1154 1155 qda[count++] = qd; 1156 } 1157 1158 if (count) { 1159 do_sync(count, qda); 1160 for (x = 0; x < count; x++) 1161 qd_unlock(qda[x]); 1162 } 1163 1164 gfs2_quota_unhold(ip); 1165 } 1166 1167 #define MAX_LINE 256 1168 1169 static int print_message(struct gfs2_quota_data *qd, char *type) 1170 { 1171 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 1172 1173 fs_info(sdp, "quota %s for %s %u\n", 1174 type, 1175 (qd->qd_id.type == USRQUOTA) ? "user" : "group", 1176 from_kqid(&init_user_ns, qd->qd_id)); 1177 1178 return 0; 1179 } 1180 1181 /** 1182 * gfs2_quota_check - check if allocating new blocks will exceed quota 1183 * @ip: The inode for which this check is being performed 1184 * @uid: The uid to check against 1185 * @gid: The gid to check against 1186 * @ap: The allocation parameters. ap->target contains the requested 1187 * blocks. ap->min_target, if set, contains the minimum blks 1188 * requested. 1189 * 1190 * Returns: 0 on success. 1191 * min_req = ap->min_target ? ap->min_target : ap->target; 1192 * quota must allow at least min_req blks for success and 1193 * ap->allowed is set to the number of blocks allowed 1194 * 1195 * -EDQUOT otherwise, quota violation. ap->allowed is set to number 1196 * of blocks available. 1197 */ 1198 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid, 1199 struct gfs2_alloc_parms *ap) 1200 { 1201 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1202 struct gfs2_quota_data *qd; 1203 s64 value, warn, limit; 1204 u32 x; 1205 int error = 0; 1206 1207 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */ 1208 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1209 return 0; 1210 1211 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1212 qd = ip->i_qadata->qa_qd[x]; 1213 1214 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1215 qid_eq(qd->qd_id, make_kqid_gid(gid)))) 1216 continue; 1217 1218 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn); 1219 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit); 1220 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1221 spin_lock(&qd_lock); 1222 value += qd->qd_change; 1223 spin_unlock(&qd_lock); 1224 1225 if (limit > 0 && (limit - value) < ap->allowed) 1226 ap->allowed = limit - value; 1227 /* If we can't meet the target */ 1228 if (limit && limit < (value + (s64)ap->target)) { 1229 /* If no min_target specified or we don't meet 1230 * min_target, return -EDQUOT */ 1231 if (!ap->min_target || ap->min_target > ap->allowed) { 1232 if (!test_and_set_bit(QDF_QMSG_QUIET, 1233 &qd->qd_flags)) { 1234 print_message(qd, "exceeded"); 1235 quota_send_warning(qd->qd_id, 1236 sdp->sd_vfs->s_dev, 1237 QUOTA_NL_BHARDWARN); 1238 } 1239 error = -EDQUOT; 1240 break; 1241 } 1242 } else if (warn && warn < value && 1243 time_after_eq(jiffies, qd->qd_last_warn + 1244 gfs2_tune_get(sdp, gt_quota_warn_period) 1245 * HZ)) { 1246 quota_send_warning(qd->qd_id, 1247 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1248 error = print_message(qd, "warning"); 1249 qd->qd_last_warn = jiffies; 1250 } 1251 } 1252 return error; 1253 } 1254 1255 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1256 kuid_t uid, kgid_t gid) 1257 { 1258 struct gfs2_quota_data *qd; 1259 u32 x; 1260 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1261 1262 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON || 1263 gfs2_assert_warn(sdp, change)) 1264 return; 1265 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1266 return; 1267 1268 if (gfs2_assert_withdraw(sdp, ip->i_qadata && 1269 ip->i_qadata->qa_ref > 0)) 1270 return; 1271 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1272 qd = ip->i_qadata->qa_qd[x]; 1273 1274 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1275 qid_eq(qd->qd_id, make_kqid_gid(gid))) { 1276 do_qc(qd, change); 1277 } 1278 } 1279 } 1280 1281 int gfs2_quota_sync(struct super_block *sb, int type) 1282 { 1283 struct gfs2_sbd *sdp = sb->s_fs_info; 1284 struct gfs2_quota_data **qda; 1285 unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder); 1286 unsigned int num_qd; 1287 unsigned int x; 1288 int error = 0; 1289 1290 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1291 if (!qda) 1292 return -ENOMEM; 1293 1294 mutex_lock(&sdp->sd_quota_sync_mutex); 1295 sdp->sd_quota_sync_gen++; 1296 1297 do { 1298 num_qd = 0; 1299 1300 for (;;) { 1301 error = qd_fish(sdp, qda + num_qd); 1302 if (error || !qda[num_qd]) 1303 break; 1304 if (++num_qd == max_qd) 1305 break; 1306 } 1307 1308 if (num_qd) { 1309 if (!error) 1310 error = do_sync(num_qd, qda); 1311 if (!error) 1312 for (x = 0; x < num_qd; x++) 1313 qda[x]->qd_sync_gen = 1314 sdp->sd_quota_sync_gen; 1315 1316 for (x = 0; x < num_qd; x++) 1317 qd_unlock(qda[x]); 1318 } 1319 } while (!error && num_qd == max_qd); 1320 1321 mutex_unlock(&sdp->sd_quota_sync_mutex); 1322 kfree(qda); 1323 1324 return error; 1325 } 1326 1327 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid) 1328 { 1329 struct gfs2_quota_data *qd; 1330 struct gfs2_holder q_gh; 1331 int error; 1332 1333 error = qd_get(sdp, qid, &qd); 1334 if (error) 1335 return error; 1336 1337 error = do_glock(qd, FORCE, &q_gh); 1338 if (!error) 1339 gfs2_glock_dq_uninit(&q_gh); 1340 1341 qd_put(qd); 1342 return error; 1343 } 1344 1345 int gfs2_quota_init(struct gfs2_sbd *sdp) 1346 { 1347 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1348 u64 size = i_size_read(sdp->sd_qc_inode); 1349 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1350 unsigned int x, slot = 0; 1351 unsigned int found = 0; 1352 unsigned int hash; 1353 unsigned int bm_size; 1354 u64 dblock; 1355 u32 extlen = 0; 1356 int error; 1357 1358 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1359 return -EIO; 1360 1361 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1362 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long)); 1363 bm_size *= sizeof(unsigned long); 1364 error = -ENOMEM; 1365 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN); 1366 if (sdp->sd_quota_bitmap == NULL) 1367 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS | 1368 __GFP_ZERO); 1369 if (!sdp->sd_quota_bitmap) 1370 return error; 1371 1372 for (x = 0; x < blocks; x++) { 1373 struct buffer_head *bh; 1374 const struct gfs2_quota_change *qc; 1375 unsigned int y; 1376 1377 if (!extlen) { 1378 int new = 0; 1379 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1380 if (error) 1381 goto fail; 1382 } 1383 error = -EIO; 1384 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1385 if (!bh) 1386 goto fail; 1387 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1388 brelse(bh); 1389 goto fail; 1390 } 1391 1392 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header)); 1393 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1394 y++, slot++) { 1395 struct gfs2_quota_data *qd; 1396 s64 qc_change = be64_to_cpu(qc->qc_change); 1397 u32 qc_flags = be32_to_cpu(qc->qc_flags); 1398 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ? 1399 USRQUOTA : GRPQUOTA; 1400 struct kqid qc_id = make_kqid(&init_user_ns, qtype, 1401 be32_to_cpu(qc->qc_id)); 1402 qc++; 1403 if (!qc_change) 1404 continue; 1405 1406 hash = gfs2_qd_hash(sdp, qc_id); 1407 qd = qd_alloc(hash, sdp, qc_id); 1408 if (qd == NULL) { 1409 brelse(bh); 1410 goto fail; 1411 } 1412 1413 set_bit(QDF_CHANGE, &qd->qd_flags); 1414 qd->qd_change = qc_change; 1415 qd->qd_slot = slot; 1416 qd->qd_slot_count = 1; 1417 1418 spin_lock(&qd_lock); 1419 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap)); 1420 list_add(&qd->qd_list, &sdp->sd_quota_list); 1421 atomic_inc(&sdp->sd_quota_count); 1422 spin_unlock(&qd_lock); 1423 1424 spin_lock_bucket(hash); 1425 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]); 1426 spin_unlock_bucket(hash); 1427 1428 found++; 1429 } 1430 1431 brelse(bh); 1432 dblock++; 1433 extlen--; 1434 } 1435 1436 if (found) 1437 fs_info(sdp, "found %u quota changes\n", found); 1438 1439 return 0; 1440 1441 fail: 1442 gfs2_quota_cleanup(sdp); 1443 return error; 1444 } 1445 1446 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1447 { 1448 struct list_head *head = &sdp->sd_quota_list; 1449 struct gfs2_quota_data *qd; 1450 1451 spin_lock(&qd_lock); 1452 while (!list_empty(head)) { 1453 qd = list_last_entry(head, struct gfs2_quota_data, qd_list); 1454 1455 list_del(&qd->qd_list); 1456 1457 /* Also remove if this qd exists in the reclaim list */ 1458 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 1459 atomic_dec(&sdp->sd_quota_count); 1460 spin_unlock(&qd_lock); 1461 1462 spin_lock_bucket(qd->qd_hash); 1463 hlist_bl_del_rcu(&qd->qd_hlist); 1464 spin_unlock_bucket(qd->qd_hash); 1465 1466 gfs2_assert_warn(sdp, !qd->qd_change); 1467 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1468 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1469 1470 gfs2_glock_put(qd->qd_gl); 1471 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); 1472 1473 spin_lock(&qd_lock); 1474 } 1475 spin_unlock(&qd_lock); 1476 1477 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1478 1479 kvfree(sdp->sd_quota_bitmap); 1480 sdp->sd_quota_bitmap = NULL; 1481 } 1482 1483 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1484 { 1485 if (error == 0 || error == -EROFS) 1486 return; 1487 if (!gfs2_withdrawn(sdp)) { 1488 if (!cmpxchg(&sdp->sd_log_error, 0, error)) 1489 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1490 wake_up(&sdp->sd_logd_waitq); 1491 } 1492 } 1493 1494 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1495 int (*fxn)(struct super_block *sb, int type), 1496 unsigned long t, unsigned long *timeo, 1497 unsigned int *new_timeo) 1498 { 1499 if (t >= *timeo) { 1500 int error = fxn(sdp->sd_vfs, 0); 1501 quotad_error(sdp, msg, error); 1502 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1503 } else { 1504 *timeo -= t; 1505 } 1506 } 1507 1508 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1509 { 1510 struct gfs2_inode *ip; 1511 1512 while(1) { 1513 ip = NULL; 1514 spin_lock(&sdp->sd_trunc_lock); 1515 if (!list_empty(&sdp->sd_trunc_list)) { 1516 ip = list_first_entry(&sdp->sd_trunc_list, 1517 struct gfs2_inode, i_trunc_list); 1518 list_del_init(&ip->i_trunc_list); 1519 } 1520 spin_unlock(&sdp->sd_trunc_lock); 1521 if (ip == NULL) 1522 return; 1523 gfs2_glock_finish_truncate(ip); 1524 } 1525 } 1526 1527 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1528 if (!sdp->sd_statfs_force_sync) { 1529 sdp->sd_statfs_force_sync = 1; 1530 wake_up(&sdp->sd_quota_wait); 1531 } 1532 } 1533 1534 1535 /** 1536 * gfs2_quotad - Write cached quota changes into the quota file 1537 * @sdp: Pointer to GFS2 superblock 1538 * 1539 */ 1540 1541 int gfs2_quotad(void *data) 1542 { 1543 struct gfs2_sbd *sdp = data; 1544 struct gfs2_tune *tune = &sdp->sd_tune; 1545 unsigned long statfs_timeo = 0; 1546 unsigned long quotad_timeo = 0; 1547 unsigned long t = 0; 1548 DEFINE_WAIT(wait); 1549 int empty; 1550 1551 while (!kthread_should_stop()) { 1552 1553 if (gfs2_withdrawn(sdp)) 1554 goto bypass; 1555 /* Update the master statfs file */ 1556 if (sdp->sd_statfs_force_sync) { 1557 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1558 quotad_error(sdp, "statfs", error); 1559 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1560 } 1561 else 1562 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1563 &statfs_timeo, 1564 &tune->gt_statfs_quantum); 1565 1566 /* Update quota file */ 1567 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t, 1568 "ad_timeo, &tune->gt_quota_quantum); 1569 1570 /* Check for & recover partially truncated inodes */ 1571 quotad_check_trunc_list(sdp); 1572 1573 try_to_freeze(); 1574 1575 bypass: 1576 t = min(quotad_timeo, statfs_timeo); 1577 1578 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1579 spin_lock(&sdp->sd_trunc_lock); 1580 empty = list_empty(&sdp->sd_trunc_list); 1581 spin_unlock(&sdp->sd_trunc_lock); 1582 if (empty && !sdp->sd_statfs_force_sync) 1583 t -= schedule_timeout(t); 1584 else 1585 t = 0; 1586 finish_wait(&sdp->sd_quota_wait, &wait); 1587 } 1588 1589 return 0; 1590 } 1591 1592 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state) 1593 { 1594 struct gfs2_sbd *sdp = sb->s_fs_info; 1595 1596 memset(state, 0, sizeof(*state)); 1597 1598 switch (sdp->sd_args.ar_quota) { 1599 case GFS2_QUOTA_ON: 1600 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED; 1601 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED; 1602 fallthrough; 1603 case GFS2_QUOTA_ACCOUNT: 1604 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED | 1605 QCI_SYSFILE; 1606 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED | 1607 QCI_SYSFILE; 1608 break; 1609 case GFS2_QUOTA_OFF: 1610 break; 1611 } 1612 if (sdp->sd_quota_inode) { 1613 state->s_state[USRQUOTA].ino = 1614 GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1615 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks; 1616 } 1617 state->s_state[USRQUOTA].nextents = 1; /* unsupported */ 1618 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA]; 1619 state->s_incoredqs = list_lru_count(&gfs2_qd_lru); 1620 return 0; 1621 } 1622 1623 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, 1624 struct qc_dqblk *fdq) 1625 { 1626 struct gfs2_sbd *sdp = sb->s_fs_info; 1627 struct gfs2_quota_lvb *qlvb; 1628 struct gfs2_quota_data *qd; 1629 struct gfs2_holder q_gh; 1630 int error; 1631 1632 memset(fdq, 0, sizeof(*fdq)); 1633 1634 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1635 return -ESRCH; /* Crazy XFS error code */ 1636 1637 if ((qid.type != USRQUOTA) && 1638 (qid.type != GRPQUOTA)) 1639 return -EINVAL; 1640 1641 error = qd_get(sdp, qid, &qd); 1642 if (error) 1643 return error; 1644 error = do_glock(qd, FORCE, &q_gh); 1645 if (error) 1646 goto out; 1647 1648 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1649 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift; 1650 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift; 1651 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift; 1652 1653 gfs2_glock_dq_uninit(&q_gh); 1654 out: 1655 qd_put(qd); 1656 return error; 1657 } 1658 1659 /* GFS2 only supports a subset of the XFS fields */ 1660 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE) 1661 1662 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, 1663 struct qc_dqblk *fdq) 1664 { 1665 struct gfs2_sbd *sdp = sb->s_fs_info; 1666 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1667 struct gfs2_quota_data *qd; 1668 struct gfs2_holder q_gh, i_gh; 1669 unsigned int data_blocks, ind_blocks; 1670 unsigned int blocks = 0; 1671 int alloc_required; 1672 loff_t offset; 1673 int error; 1674 1675 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1676 return -ESRCH; /* Crazy XFS error code */ 1677 1678 if ((qid.type != USRQUOTA) && 1679 (qid.type != GRPQUOTA)) 1680 return -EINVAL; 1681 1682 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1683 return -EINVAL; 1684 1685 error = qd_get(sdp, qid, &qd); 1686 if (error) 1687 return error; 1688 1689 error = gfs2_qa_get(ip); 1690 if (error) 1691 goto out_put; 1692 1693 inode_lock(&ip->i_inode); 1694 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1695 if (error) 1696 goto out_unlockput; 1697 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1698 if (error) 1699 goto out_q; 1700 1701 /* Check for existing entry, if none then alloc new blocks */ 1702 error = update_qd(sdp, qd); 1703 if (error) 1704 goto out_i; 1705 1706 /* If nothing has changed, this is a no-op */ 1707 if ((fdq->d_fieldmask & QC_SPC_SOFT) && 1708 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1709 fdq->d_fieldmask ^= QC_SPC_SOFT; 1710 1711 if ((fdq->d_fieldmask & QC_SPC_HARD) && 1712 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1713 fdq->d_fieldmask ^= QC_SPC_HARD; 1714 1715 if ((fdq->d_fieldmask & QC_SPACE) && 1716 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1717 fdq->d_fieldmask ^= QC_SPACE; 1718 1719 if (fdq->d_fieldmask == 0) 1720 goto out_i; 1721 1722 offset = qd2offset(qd); 1723 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1724 if (gfs2_is_stuffed(ip)) 1725 alloc_required = 1; 1726 if (alloc_required) { 1727 struct gfs2_alloc_parms ap = { .aflags = 0, }; 1728 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1729 &data_blocks, &ind_blocks); 1730 blocks = 1 + data_blocks + ind_blocks; 1731 ap.target = blocks; 1732 error = gfs2_inplace_reserve(ip, &ap); 1733 if (error) 1734 goto out_i; 1735 blocks += gfs2_rg_blocks(ip, blocks); 1736 } 1737 1738 /* Some quotas span block boundaries and can update two blocks, 1739 adding an extra block to the transaction to handle such quotas */ 1740 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1741 if (error) 1742 goto out_release; 1743 1744 /* Apply changes */ 1745 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1746 if (!error) 1747 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); 1748 1749 gfs2_trans_end(sdp); 1750 out_release: 1751 if (alloc_required) 1752 gfs2_inplace_release(ip); 1753 out_i: 1754 gfs2_glock_dq_uninit(&i_gh); 1755 out_q: 1756 gfs2_glock_dq_uninit(&q_gh); 1757 out_unlockput: 1758 gfs2_qa_put(ip); 1759 inode_unlock(&ip->i_inode); 1760 out_put: 1761 qd_put(qd); 1762 return error; 1763 } 1764 1765 const struct quotactl_ops gfs2_quotactl_ops = { 1766 .quota_sync = gfs2_quota_sync, 1767 .get_state = gfs2_quota_get_state, 1768 .get_dqblk = gfs2_get_dqblk, 1769 .set_dqblk = gfs2_set_dqblk, 1770 }; 1771 1772 void __init gfs2_quota_hash_init(void) 1773 { 1774 unsigned i; 1775 1776 for(i = 0; i < GFS2_QD_HASH_SIZE; i++) 1777 INIT_HLIST_BL_HEAD(&qd_hash_table[i]); 1778 } 1779