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_entry(list->next, 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_alloc - make sure we have a quota allocations data structure, 529 * if necessary 530 * @ip: the inode for this reservation 531 */ 532 int gfs2_qa_alloc(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 } 546 up_write(&ip->i_rw_mutex); 547 return error; 548 } 549 550 void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount) 551 { 552 down_write(&ip->i_rw_mutex); 553 if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) { 554 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata); 555 ip->i_qadata = NULL; 556 } 557 up_write(&ip->i_rw_mutex); 558 } 559 560 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 561 { 562 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 563 struct gfs2_quota_data **qd; 564 int error; 565 566 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 567 return 0; 568 569 if (ip->i_qadata == NULL) { 570 error = gfs2_rsqa_alloc(ip); 571 if (error) 572 return error; 573 } 574 575 qd = ip->i_qadata->qa_qd; 576 577 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) || 578 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 579 return -EIO; 580 581 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd); 582 if (error) 583 goto out; 584 ip->i_qadata->qa_qd_num++; 585 qd++; 586 587 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd); 588 if (error) 589 goto out; 590 ip->i_qadata->qa_qd_num++; 591 qd++; 592 593 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) && 594 !uid_eq(uid, ip->i_inode.i_uid)) { 595 error = qdsb_get(sdp, make_kqid_uid(uid), qd); 596 if (error) 597 goto out; 598 ip->i_qadata->qa_qd_num++; 599 qd++; 600 } 601 602 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) && 603 !gid_eq(gid, ip->i_inode.i_gid)) { 604 error = qdsb_get(sdp, make_kqid_gid(gid), qd); 605 if (error) 606 goto out; 607 ip->i_qadata->qa_qd_num++; 608 qd++; 609 } 610 611 out: 612 if (error) 613 gfs2_quota_unhold(ip); 614 return error; 615 } 616 617 void gfs2_quota_unhold(struct gfs2_inode *ip) 618 { 619 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 620 u32 x; 621 622 if (ip->i_qadata == NULL) 623 return; 624 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 625 626 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 627 qdsb_put(ip->i_qadata->qa_qd[x]); 628 ip->i_qadata->qa_qd[x] = NULL; 629 } 630 ip->i_qadata->qa_qd_num = 0; 631 } 632 633 static int sort_qd(const void *a, const void *b) 634 { 635 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 636 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 637 638 if (qid_lt(qd_a->qd_id, qd_b->qd_id)) 639 return -1; 640 if (qid_lt(qd_b->qd_id, qd_a->qd_id)) 641 return 1; 642 return 0; 643 } 644 645 static void do_qc(struct gfs2_quota_data *qd, s64 change) 646 { 647 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 648 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 649 struct gfs2_quota_change *qc = qd->qd_bh_qc; 650 s64 x; 651 652 mutex_lock(&sdp->sd_quota_mutex); 653 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh); 654 655 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 656 qc->qc_change = 0; 657 qc->qc_flags = 0; 658 if (qd->qd_id.type == USRQUOTA) 659 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 660 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id)); 661 } 662 663 x = be64_to_cpu(qc->qc_change) + change; 664 qc->qc_change = cpu_to_be64(x); 665 666 spin_lock(&qd_lock); 667 qd->qd_change = x; 668 spin_unlock(&qd_lock); 669 670 if (!x) { 671 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 672 clear_bit(QDF_CHANGE, &qd->qd_flags); 673 qc->qc_flags = 0; 674 qc->qc_id = 0; 675 slot_put(qd); 676 qd_put(qd); 677 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 678 qd_hold(qd); 679 slot_hold(qd); 680 } 681 682 if (change < 0) /* Reset quiet flag if we freed some blocks */ 683 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); 684 mutex_unlock(&sdp->sd_quota_mutex); 685 } 686 687 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index, 688 unsigned off, void *buf, unsigned bytes) 689 { 690 struct inode *inode = &ip->i_inode; 691 struct gfs2_sbd *sdp = GFS2_SB(inode); 692 struct address_space *mapping = inode->i_mapping; 693 struct page *page; 694 struct buffer_head *bh; 695 void *kaddr; 696 u64 blk; 697 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0; 698 unsigned to_write = bytes, pg_off = off; 699 int done = 0; 700 701 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift); 702 boff = off % bsize; 703 704 page = find_or_create_page(mapping, index, GFP_NOFS); 705 if (!page) 706 return -ENOMEM; 707 if (!page_has_buffers(page)) 708 create_empty_buffers(page, bsize, 0); 709 710 bh = page_buffers(page); 711 while (!done) { 712 /* Find the beginning block within the page */ 713 if (pg_off >= ((bnum * bsize) + bsize)) { 714 bh = bh->b_this_page; 715 bnum++; 716 blk++; 717 continue; 718 } 719 if (!buffer_mapped(bh)) { 720 gfs2_block_map(inode, blk, bh, 1); 721 if (!buffer_mapped(bh)) 722 goto unlock_out; 723 /* If it's a newly allocated disk block, zero it */ 724 if (buffer_new(bh)) 725 zero_user(page, bnum * bsize, bh->b_size); 726 } 727 if (PageUptodate(page)) 728 set_buffer_uptodate(bh); 729 if (!buffer_uptodate(bh)) { 730 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh); 731 wait_on_buffer(bh); 732 if (!buffer_uptodate(bh)) 733 goto unlock_out; 734 } 735 if (gfs2_is_jdata(ip)) 736 gfs2_trans_add_data(ip->i_gl, bh); 737 else 738 gfs2_ordered_add_inode(ip); 739 740 /* If we need to write to the next block as well */ 741 if (to_write > (bsize - boff)) { 742 pg_off += (bsize - boff); 743 to_write -= (bsize - boff); 744 boff = pg_off % bsize; 745 continue; 746 } 747 done = 1; 748 } 749 750 /* Write to the page, now that we have setup the buffer(s) */ 751 kaddr = kmap_atomic(page); 752 memcpy(kaddr + off, buf, bytes); 753 flush_dcache_page(page); 754 kunmap_atomic(kaddr); 755 unlock_page(page); 756 put_page(page); 757 758 return 0; 759 760 unlock_out: 761 unlock_page(page); 762 put_page(page); 763 return -EIO; 764 } 765 766 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp, 767 loff_t loc) 768 { 769 unsigned long pg_beg; 770 unsigned pg_off, nbytes, overflow = 0; 771 int pg_oflow = 0, error; 772 void *ptr; 773 774 nbytes = sizeof(struct gfs2_quota); 775 776 pg_beg = loc >> PAGE_SHIFT; 777 pg_off = offset_in_page(loc); 778 779 /* If the quota straddles a page boundary, split the write in two */ 780 if ((pg_off + nbytes) > PAGE_SIZE) { 781 pg_oflow = 1; 782 overflow = (pg_off + nbytes) - PAGE_SIZE; 783 } 784 785 ptr = qp; 786 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr, 787 nbytes - overflow); 788 /* If there's an overflow, write the remaining bytes to the next page */ 789 if (!error && pg_oflow) 790 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0, 791 ptr + nbytes - overflow, 792 overflow); 793 return error; 794 } 795 796 /** 797 * gfs2_adjust_quota - adjust record of current block usage 798 * @ip: The quota inode 799 * @loc: Offset of the entry in the quota file 800 * @change: The amount of usage change to record 801 * @qd: The quota data 802 * @fdq: The updated limits to record 803 * 804 * This function was mostly borrowed from gfs2_block_truncate_page which was 805 * in turn mostly borrowed from ext3 806 * 807 * Returns: 0 or -ve on error 808 */ 809 810 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 811 s64 change, struct gfs2_quota_data *qd, 812 struct qc_dqblk *fdq) 813 { 814 struct inode *inode = &ip->i_inode; 815 struct gfs2_sbd *sdp = GFS2_SB(inode); 816 struct gfs2_quota q; 817 int err; 818 u64 size; 819 820 if (gfs2_is_stuffed(ip)) { 821 err = gfs2_unstuff_dinode(ip, NULL); 822 if (err) 823 return err; 824 } 825 826 memset(&q, 0, sizeof(struct gfs2_quota)); 827 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); 828 if (err < 0) 829 return err; 830 831 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */ 832 err = -EIO; 833 be64_add_cpu(&q.qu_value, change); 834 if (((s64)be64_to_cpu(q.qu_value)) < 0) 835 q.qu_value = 0; /* Never go negative on quota usage */ 836 qd->qd_qb.qb_value = q.qu_value; 837 if (fdq) { 838 if (fdq->d_fieldmask & QC_SPC_SOFT) { 839 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift); 840 qd->qd_qb.qb_warn = q.qu_warn; 841 } 842 if (fdq->d_fieldmask & QC_SPC_HARD) { 843 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift); 844 qd->qd_qb.qb_limit = q.qu_limit; 845 } 846 if (fdq->d_fieldmask & QC_SPACE) { 847 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift); 848 qd->qd_qb.qb_value = q.qu_value; 849 } 850 } 851 852 err = gfs2_write_disk_quota(ip, &q, loc); 853 if (!err) { 854 size = loc + sizeof(struct gfs2_quota); 855 if (size > inode->i_size) 856 i_size_write(inode, size); 857 inode->i_mtime = inode->i_atime = current_time(inode); 858 mark_inode_dirty(inode); 859 set_bit(QDF_REFRESH, &qd->qd_flags); 860 } 861 862 return err; 863 } 864 865 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 866 { 867 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd; 868 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 869 struct gfs2_alloc_parms ap = { .aflags = 0, }; 870 unsigned int data_blocks, ind_blocks; 871 struct gfs2_holder *ghs, i_gh; 872 unsigned int qx, x; 873 struct gfs2_quota_data *qd; 874 unsigned reserved; 875 loff_t offset; 876 unsigned int nalloc = 0, blocks; 877 int error; 878 879 error = gfs2_rsqa_alloc(ip); 880 if (error) 881 return error; 882 883 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 884 &data_blocks, &ind_blocks); 885 886 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 887 if (!ghs) 888 return -ENOMEM; 889 890 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 891 inode_lock(&ip->i_inode); 892 for (qx = 0; qx < num_qd; qx++) { 893 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 894 GL_NOCACHE, &ghs[qx]); 895 if (error) 896 goto out; 897 } 898 899 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 900 if (error) 901 goto out; 902 903 for (x = 0; x < num_qd; x++) { 904 offset = qd2offset(qda[x]); 905 if (gfs2_write_alloc_required(ip, offset, 906 sizeof(struct gfs2_quota))) 907 nalloc++; 908 } 909 910 /* 911 * 1 blk for unstuffing inode if stuffed. We add this extra 912 * block to the reservation unconditionally. If the inode 913 * doesn't need unstuffing, the block will be released to the 914 * rgrp since it won't be allocated during the transaction 915 */ 916 /* +3 in the end for unstuffing block, inode size update block 917 * and another block in case quota straddles page boundary and 918 * two blocks need to be updated instead of 1 */ 919 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 920 921 reserved = 1 + (nalloc * (data_blocks + ind_blocks)); 922 ap.target = reserved; 923 error = gfs2_inplace_reserve(ip, &ap); 924 if (error) 925 goto out_alloc; 926 927 if (nalloc) 928 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; 929 930 error = gfs2_trans_begin(sdp, blocks, 0); 931 if (error) 932 goto out_ipres; 933 934 for (x = 0; x < num_qd; x++) { 935 qd = qda[x]; 936 offset = qd2offset(qd); 937 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 938 if (error) 939 goto out_end_trans; 940 941 do_qc(qd, -qd->qd_change_sync); 942 set_bit(QDF_REFRESH, &qd->qd_flags); 943 } 944 945 error = 0; 946 947 out_end_trans: 948 gfs2_trans_end(sdp); 949 out_ipres: 950 gfs2_inplace_release(ip); 951 out_alloc: 952 gfs2_glock_dq_uninit(&i_gh); 953 out: 954 while (qx--) 955 gfs2_glock_dq_uninit(&ghs[qx]); 956 inode_unlock(&ip->i_inode); 957 kfree(ghs); 958 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, 959 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC); 960 return error; 961 } 962 963 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 964 { 965 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 966 struct gfs2_quota q; 967 struct gfs2_quota_lvb *qlvb; 968 loff_t pos; 969 int error; 970 971 memset(&q, 0, sizeof(struct gfs2_quota)); 972 pos = qd2offset(qd); 973 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); 974 if (error < 0) 975 return error; 976 977 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 978 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 979 qlvb->__pad = 0; 980 qlvb->qb_limit = q.qu_limit; 981 qlvb->qb_warn = q.qu_warn; 982 qlvb->qb_value = q.qu_value; 983 qd->qd_qb = *qlvb; 984 985 return 0; 986 } 987 988 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 989 struct gfs2_holder *q_gh) 990 { 991 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 992 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 993 struct gfs2_holder i_gh; 994 int error; 995 996 restart: 997 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 998 if (error) 999 return error; 1000 1001 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 1002 force_refresh = FORCE; 1003 1004 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1005 1006 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 1007 gfs2_glock_dq_uninit(q_gh); 1008 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 1009 GL_NOCACHE, q_gh); 1010 if (error) 1011 return error; 1012 1013 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1014 if (error) 1015 goto fail; 1016 1017 error = update_qd(sdp, qd); 1018 if (error) 1019 goto fail_gunlock; 1020 1021 gfs2_glock_dq_uninit(&i_gh); 1022 gfs2_glock_dq_uninit(q_gh); 1023 force_refresh = 0; 1024 goto restart; 1025 } 1026 1027 return 0; 1028 1029 fail_gunlock: 1030 gfs2_glock_dq_uninit(&i_gh); 1031 fail: 1032 gfs2_glock_dq_uninit(q_gh); 1033 return error; 1034 } 1035 1036 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid) 1037 { 1038 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1039 struct gfs2_quota_data *qd; 1040 u32 x; 1041 int error = 0; 1042 1043 if (capable(CAP_SYS_RESOURCE) || 1044 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1045 return 0; 1046 1047 error = gfs2_quota_hold(ip, uid, gid); 1048 if (error) 1049 return error; 1050 1051 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num, 1052 sizeof(struct gfs2_quota_data *), sort_qd, NULL); 1053 1054 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1055 qd = ip->i_qadata->qa_qd[x]; 1056 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]); 1057 if (error) 1058 break; 1059 } 1060 1061 if (!error) 1062 set_bit(GIF_QD_LOCKED, &ip->i_flags); 1063 else { 1064 while (x--) 1065 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); 1066 gfs2_quota_unhold(ip); 1067 } 1068 1069 return error; 1070 } 1071 1072 static int need_sync(struct gfs2_quota_data *qd) 1073 { 1074 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 1075 struct gfs2_tune *gt = &sdp->sd_tune; 1076 s64 value; 1077 unsigned int num, den; 1078 int do_sync = 1; 1079 1080 if (!qd->qd_qb.qb_limit) 1081 return 0; 1082 1083 spin_lock(&qd_lock); 1084 value = qd->qd_change; 1085 spin_unlock(&qd_lock); 1086 1087 spin_lock(>->gt_spin); 1088 num = gt->gt_quota_scale_num; 1089 den = gt->gt_quota_scale_den; 1090 spin_unlock(>->gt_spin); 1091 1092 if (value < 0) 1093 do_sync = 0; 1094 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 1095 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1096 do_sync = 0; 1097 else { 1098 value *= gfs2_jindex_size(sdp) * num; 1099 value = div_s64(value, den); 1100 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 1101 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 1102 do_sync = 0; 1103 } 1104 1105 return do_sync; 1106 } 1107 1108 void gfs2_quota_unlock(struct gfs2_inode *ip) 1109 { 1110 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1111 struct gfs2_quota_data *qda[4]; 1112 unsigned int count = 0; 1113 u32 x; 1114 int found; 1115 1116 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1117 goto out; 1118 1119 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1120 struct gfs2_quota_data *qd; 1121 int sync; 1122 1123 qd = ip->i_qadata->qa_qd[x]; 1124 sync = need_sync(qd); 1125 1126 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]); 1127 if (!sync) 1128 continue; 1129 1130 spin_lock(&qd_lock); 1131 found = qd_check_sync(sdp, qd, NULL); 1132 spin_unlock(&qd_lock); 1133 1134 if (!found) 1135 continue; 1136 1137 gfs2_assert_warn(sdp, qd->qd_change_sync); 1138 if (bh_get(qd)) { 1139 clear_bit(QDF_LOCKED, &qd->qd_flags); 1140 slot_put(qd); 1141 qd_put(qd); 1142 continue; 1143 } 1144 1145 qda[count++] = qd; 1146 } 1147 1148 if (count) { 1149 do_sync(count, qda); 1150 for (x = 0; x < count; x++) 1151 qd_unlock(qda[x]); 1152 } 1153 1154 out: 1155 gfs2_quota_unhold(ip); 1156 } 1157 1158 #define MAX_LINE 256 1159 1160 static int print_message(struct gfs2_quota_data *qd, char *type) 1161 { 1162 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd; 1163 1164 fs_info(sdp, "quota %s for %s %u\n", 1165 type, 1166 (qd->qd_id.type == USRQUOTA) ? "user" : "group", 1167 from_kqid(&init_user_ns, qd->qd_id)); 1168 1169 return 0; 1170 } 1171 1172 /** 1173 * gfs2_quota_check - check if allocating new blocks will exceed quota 1174 * @ip: The inode for which this check is being performed 1175 * @uid: The uid to check against 1176 * @gid: The gid to check against 1177 * @ap: The allocation parameters. ap->target contains the requested 1178 * blocks. ap->min_target, if set, contains the minimum blks 1179 * requested. 1180 * 1181 * Returns: 0 on success. 1182 * min_req = ap->min_target ? ap->min_target : ap->target; 1183 * quota must allow at least min_req blks for success and 1184 * ap->allowed is set to the number of blocks allowed 1185 * 1186 * -EDQUOT otherwise, quota violation. ap->allowed is set to number 1187 * of blocks available. 1188 */ 1189 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid, 1190 struct gfs2_alloc_parms *ap) 1191 { 1192 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1193 struct gfs2_quota_data *qd; 1194 s64 value, warn, limit; 1195 u32 x; 1196 int error = 0; 1197 1198 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */ 1199 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1200 return 0; 1201 1202 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1203 return 0; 1204 1205 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1206 qd = ip->i_qadata->qa_qd[x]; 1207 1208 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1209 qid_eq(qd->qd_id, make_kqid_gid(gid)))) 1210 continue; 1211 1212 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn); 1213 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit); 1214 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1215 spin_lock(&qd_lock); 1216 value += qd->qd_change; 1217 spin_unlock(&qd_lock); 1218 1219 if (limit > 0 && (limit - value) < ap->allowed) 1220 ap->allowed = limit - value; 1221 /* If we can't meet the target */ 1222 if (limit && limit < (value + (s64)ap->target)) { 1223 /* If no min_target specified or we don't meet 1224 * min_target, return -EDQUOT */ 1225 if (!ap->min_target || ap->min_target > ap->allowed) { 1226 if (!test_and_set_bit(QDF_QMSG_QUIET, 1227 &qd->qd_flags)) { 1228 print_message(qd, "exceeded"); 1229 quota_send_warning(qd->qd_id, 1230 sdp->sd_vfs->s_dev, 1231 QUOTA_NL_BHARDWARN); 1232 } 1233 error = -EDQUOT; 1234 break; 1235 } 1236 } else if (warn && warn < value && 1237 time_after_eq(jiffies, qd->qd_last_warn + 1238 gfs2_tune_get(sdp, gt_quota_warn_period) 1239 * HZ)) { 1240 quota_send_warning(qd->qd_id, 1241 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1242 error = print_message(qd, "warning"); 1243 qd->qd_last_warn = jiffies; 1244 } 1245 } 1246 return error; 1247 } 1248 1249 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1250 kuid_t uid, kgid_t gid) 1251 { 1252 struct gfs2_quota_data *qd; 1253 u32 x; 1254 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1255 1256 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON || 1257 gfs2_assert_warn(sdp, change)) 1258 return; 1259 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1260 return; 1261 1262 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) { 1263 qd = ip->i_qadata->qa_qd[x]; 1264 1265 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) || 1266 qid_eq(qd->qd_id, make_kqid_gid(gid))) { 1267 do_qc(qd, change); 1268 } 1269 } 1270 } 1271 1272 int gfs2_quota_sync(struct super_block *sb, int type) 1273 { 1274 struct gfs2_sbd *sdp = sb->s_fs_info; 1275 struct gfs2_quota_data **qda; 1276 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder); 1277 unsigned int num_qd; 1278 unsigned int x; 1279 int error = 0; 1280 1281 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1282 if (!qda) 1283 return -ENOMEM; 1284 1285 mutex_lock(&sdp->sd_quota_sync_mutex); 1286 sdp->sd_quota_sync_gen++; 1287 1288 do { 1289 num_qd = 0; 1290 1291 for (;;) { 1292 error = qd_fish(sdp, qda + num_qd); 1293 if (error || !qda[num_qd]) 1294 break; 1295 if (++num_qd == max_qd) 1296 break; 1297 } 1298 1299 if (num_qd) { 1300 if (!error) 1301 error = do_sync(num_qd, qda); 1302 if (!error) 1303 for (x = 0; x < num_qd; x++) 1304 qda[x]->qd_sync_gen = 1305 sdp->sd_quota_sync_gen; 1306 1307 for (x = 0; x < num_qd; x++) 1308 qd_unlock(qda[x]); 1309 } 1310 } while (!error && num_qd == max_qd); 1311 1312 mutex_unlock(&sdp->sd_quota_sync_mutex); 1313 kfree(qda); 1314 1315 return error; 1316 } 1317 1318 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid) 1319 { 1320 struct gfs2_quota_data *qd; 1321 struct gfs2_holder q_gh; 1322 int error; 1323 1324 error = qd_get(sdp, qid, &qd); 1325 if (error) 1326 return error; 1327 1328 error = do_glock(qd, FORCE, &q_gh); 1329 if (!error) 1330 gfs2_glock_dq_uninit(&q_gh); 1331 1332 qd_put(qd); 1333 return error; 1334 } 1335 1336 int gfs2_quota_init(struct gfs2_sbd *sdp) 1337 { 1338 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1339 u64 size = i_size_read(sdp->sd_qc_inode); 1340 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1341 unsigned int x, slot = 0; 1342 unsigned int found = 0; 1343 unsigned int hash; 1344 unsigned int bm_size; 1345 u64 dblock; 1346 u32 extlen = 0; 1347 int error; 1348 1349 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1350 return -EIO; 1351 1352 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1353 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long)); 1354 bm_size *= sizeof(unsigned long); 1355 error = -ENOMEM; 1356 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN); 1357 if (sdp->sd_quota_bitmap == NULL) 1358 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS | 1359 __GFP_ZERO, PAGE_KERNEL); 1360 if (!sdp->sd_quota_bitmap) 1361 return error; 1362 1363 for (x = 0; x < blocks; x++) { 1364 struct buffer_head *bh; 1365 const struct gfs2_quota_change *qc; 1366 unsigned int y; 1367 1368 if (!extlen) { 1369 int new = 0; 1370 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1371 if (error) 1372 goto fail; 1373 } 1374 error = -EIO; 1375 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1376 if (!bh) 1377 goto fail; 1378 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1379 brelse(bh); 1380 goto fail; 1381 } 1382 1383 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header)); 1384 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1385 y++, slot++) { 1386 struct gfs2_quota_data *qd; 1387 s64 qc_change = be64_to_cpu(qc->qc_change); 1388 u32 qc_flags = be32_to_cpu(qc->qc_flags); 1389 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ? 1390 USRQUOTA : GRPQUOTA; 1391 struct kqid qc_id = make_kqid(&init_user_ns, qtype, 1392 be32_to_cpu(qc->qc_id)); 1393 qc++; 1394 if (!qc_change) 1395 continue; 1396 1397 hash = gfs2_qd_hash(sdp, qc_id); 1398 qd = qd_alloc(hash, sdp, qc_id); 1399 if (qd == NULL) { 1400 brelse(bh); 1401 goto fail; 1402 } 1403 1404 set_bit(QDF_CHANGE, &qd->qd_flags); 1405 qd->qd_change = qc_change; 1406 qd->qd_slot = slot; 1407 qd->qd_slot_count = 1; 1408 1409 spin_lock(&qd_lock); 1410 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap)); 1411 list_add(&qd->qd_list, &sdp->sd_quota_list); 1412 atomic_inc(&sdp->sd_quota_count); 1413 spin_unlock(&qd_lock); 1414 1415 spin_lock_bucket(hash); 1416 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]); 1417 spin_unlock_bucket(hash); 1418 1419 found++; 1420 } 1421 1422 brelse(bh); 1423 dblock++; 1424 extlen--; 1425 } 1426 1427 if (found) 1428 fs_info(sdp, "found %u quota changes\n", found); 1429 1430 return 0; 1431 1432 fail: 1433 gfs2_quota_cleanup(sdp); 1434 return error; 1435 } 1436 1437 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1438 { 1439 struct list_head *head = &sdp->sd_quota_list; 1440 struct gfs2_quota_data *qd; 1441 1442 spin_lock(&qd_lock); 1443 while (!list_empty(head)) { 1444 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1445 1446 list_del(&qd->qd_list); 1447 1448 /* Also remove if this qd exists in the reclaim list */ 1449 list_lru_del(&gfs2_qd_lru, &qd->qd_lru); 1450 atomic_dec(&sdp->sd_quota_count); 1451 spin_unlock(&qd_lock); 1452 1453 spin_lock_bucket(qd->qd_hash); 1454 hlist_bl_del_rcu(&qd->qd_hlist); 1455 spin_unlock_bucket(qd->qd_hash); 1456 1457 gfs2_assert_warn(sdp, !qd->qd_change); 1458 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1459 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1460 1461 gfs2_glock_put(qd->qd_gl); 1462 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc); 1463 1464 spin_lock(&qd_lock); 1465 } 1466 spin_unlock(&qd_lock); 1467 1468 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1469 1470 kvfree(sdp->sd_quota_bitmap); 1471 sdp->sd_quota_bitmap = NULL; 1472 } 1473 1474 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1475 { 1476 if (error == 0 || error == -EROFS) 1477 return; 1478 if (!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) { 1479 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1480 sdp->sd_log_error = error; 1481 wake_up(&sdp->sd_logd_waitq); 1482 } 1483 } 1484 1485 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1486 int (*fxn)(struct super_block *sb, int type), 1487 unsigned long t, unsigned long *timeo, 1488 unsigned int *new_timeo) 1489 { 1490 if (t >= *timeo) { 1491 int error = fxn(sdp->sd_vfs, 0); 1492 quotad_error(sdp, msg, error); 1493 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1494 } else { 1495 *timeo -= t; 1496 } 1497 } 1498 1499 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1500 { 1501 struct gfs2_inode *ip; 1502 1503 while(1) { 1504 ip = NULL; 1505 spin_lock(&sdp->sd_trunc_lock); 1506 if (!list_empty(&sdp->sd_trunc_list)) { 1507 ip = list_entry(sdp->sd_trunc_list.next, 1508 struct gfs2_inode, i_trunc_list); 1509 list_del_init(&ip->i_trunc_list); 1510 } 1511 spin_unlock(&sdp->sd_trunc_lock); 1512 if (ip == NULL) 1513 return; 1514 gfs2_glock_finish_truncate(ip); 1515 } 1516 } 1517 1518 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1519 if (!sdp->sd_statfs_force_sync) { 1520 sdp->sd_statfs_force_sync = 1; 1521 wake_up(&sdp->sd_quota_wait); 1522 } 1523 } 1524 1525 1526 /** 1527 * gfs2_quotad - Write cached quota changes into the quota file 1528 * @sdp: Pointer to GFS2 superblock 1529 * 1530 */ 1531 1532 int gfs2_quotad(void *data) 1533 { 1534 struct gfs2_sbd *sdp = data; 1535 struct gfs2_tune *tune = &sdp->sd_tune; 1536 unsigned long statfs_timeo = 0; 1537 unsigned long quotad_timeo = 0; 1538 unsigned long t = 0; 1539 DEFINE_WAIT(wait); 1540 int empty; 1541 1542 while (!kthread_should_stop()) { 1543 1544 /* Update the master statfs file */ 1545 if (sdp->sd_statfs_force_sync) { 1546 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1547 quotad_error(sdp, "statfs", error); 1548 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1549 } 1550 else 1551 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1552 &statfs_timeo, 1553 &tune->gt_statfs_quantum); 1554 1555 /* Update quota file */ 1556 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t, 1557 "ad_timeo, &tune->gt_quota_quantum); 1558 1559 /* Check for & recover partially truncated inodes */ 1560 quotad_check_trunc_list(sdp); 1561 1562 try_to_freeze(); 1563 1564 t = min(quotad_timeo, statfs_timeo); 1565 1566 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1567 spin_lock(&sdp->sd_trunc_lock); 1568 empty = list_empty(&sdp->sd_trunc_list); 1569 spin_unlock(&sdp->sd_trunc_lock); 1570 if (empty && !sdp->sd_statfs_force_sync) 1571 t -= schedule_timeout(t); 1572 else 1573 t = 0; 1574 finish_wait(&sdp->sd_quota_wait, &wait); 1575 } 1576 1577 return 0; 1578 } 1579 1580 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state) 1581 { 1582 struct gfs2_sbd *sdp = sb->s_fs_info; 1583 1584 memset(state, 0, sizeof(*state)); 1585 1586 switch (sdp->sd_args.ar_quota) { 1587 case GFS2_QUOTA_ON: 1588 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED; 1589 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED; 1590 /*FALLTHRU*/ 1591 case GFS2_QUOTA_ACCOUNT: 1592 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED | 1593 QCI_SYSFILE; 1594 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED | 1595 QCI_SYSFILE; 1596 break; 1597 case GFS2_QUOTA_OFF: 1598 break; 1599 } 1600 if (sdp->sd_quota_inode) { 1601 state->s_state[USRQUOTA].ino = 1602 GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1603 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks; 1604 } 1605 state->s_state[USRQUOTA].nextents = 1; /* unsupported */ 1606 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA]; 1607 state->s_incoredqs = list_lru_count(&gfs2_qd_lru); 1608 return 0; 1609 } 1610 1611 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, 1612 struct qc_dqblk *fdq) 1613 { 1614 struct gfs2_sbd *sdp = sb->s_fs_info; 1615 struct gfs2_quota_lvb *qlvb; 1616 struct gfs2_quota_data *qd; 1617 struct gfs2_holder q_gh; 1618 int error; 1619 1620 memset(fdq, 0, sizeof(*fdq)); 1621 1622 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1623 return -ESRCH; /* Crazy XFS error code */ 1624 1625 if ((qid.type != USRQUOTA) && 1626 (qid.type != GRPQUOTA)) 1627 return -EINVAL; 1628 1629 error = qd_get(sdp, qid, &qd); 1630 if (error) 1631 return error; 1632 error = do_glock(qd, FORCE, &q_gh); 1633 if (error) 1634 goto out; 1635 1636 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1637 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift; 1638 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift; 1639 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift; 1640 1641 gfs2_glock_dq_uninit(&q_gh); 1642 out: 1643 qd_put(qd); 1644 return error; 1645 } 1646 1647 /* GFS2 only supports a subset of the XFS fields */ 1648 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE) 1649 1650 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, 1651 struct qc_dqblk *fdq) 1652 { 1653 struct gfs2_sbd *sdp = sb->s_fs_info; 1654 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1655 struct gfs2_quota_data *qd; 1656 struct gfs2_holder q_gh, i_gh; 1657 unsigned int data_blocks, ind_blocks; 1658 unsigned int blocks = 0; 1659 int alloc_required; 1660 loff_t offset; 1661 int error; 1662 1663 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1664 return -ESRCH; /* Crazy XFS error code */ 1665 1666 if ((qid.type != USRQUOTA) && 1667 (qid.type != GRPQUOTA)) 1668 return -EINVAL; 1669 1670 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1671 return -EINVAL; 1672 1673 error = qd_get(sdp, qid, &qd); 1674 if (error) 1675 return error; 1676 1677 error = gfs2_rsqa_alloc(ip); 1678 if (error) 1679 goto out_put; 1680 1681 inode_lock(&ip->i_inode); 1682 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1683 if (error) 1684 goto out_unlockput; 1685 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1686 if (error) 1687 goto out_q; 1688 1689 /* Check for existing entry, if none then alloc new blocks */ 1690 error = update_qd(sdp, qd); 1691 if (error) 1692 goto out_i; 1693 1694 /* If nothing has changed, this is a no-op */ 1695 if ((fdq->d_fieldmask & QC_SPC_SOFT) && 1696 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1697 fdq->d_fieldmask ^= QC_SPC_SOFT; 1698 1699 if ((fdq->d_fieldmask & QC_SPC_HARD) && 1700 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1701 fdq->d_fieldmask ^= QC_SPC_HARD; 1702 1703 if ((fdq->d_fieldmask & QC_SPACE) && 1704 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1705 fdq->d_fieldmask ^= QC_SPACE; 1706 1707 if (fdq->d_fieldmask == 0) 1708 goto out_i; 1709 1710 offset = qd2offset(qd); 1711 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1712 if (gfs2_is_stuffed(ip)) 1713 alloc_required = 1; 1714 if (alloc_required) { 1715 struct gfs2_alloc_parms ap = { .aflags = 0, }; 1716 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1717 &data_blocks, &ind_blocks); 1718 blocks = 1 + data_blocks + ind_blocks; 1719 ap.target = blocks; 1720 error = gfs2_inplace_reserve(ip, &ap); 1721 if (error) 1722 goto out_i; 1723 blocks += gfs2_rg_blocks(ip, blocks); 1724 } 1725 1726 /* Some quotas span block boundaries and can update two blocks, 1727 adding an extra block to the transaction to handle such quotas */ 1728 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1729 if (error) 1730 goto out_release; 1731 1732 /* Apply changes */ 1733 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1734 if (!error) 1735 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags); 1736 1737 gfs2_trans_end(sdp); 1738 out_release: 1739 if (alloc_required) 1740 gfs2_inplace_release(ip); 1741 out_i: 1742 gfs2_glock_dq_uninit(&i_gh); 1743 out_q: 1744 gfs2_glock_dq_uninit(&q_gh); 1745 out_unlockput: 1746 inode_unlock(&ip->i_inode); 1747 out_put: 1748 qd_put(qd); 1749 return error; 1750 } 1751 1752 const struct quotactl_ops gfs2_quotactl_ops = { 1753 .quota_sync = gfs2_quota_sync, 1754 .get_state = gfs2_quota_get_state, 1755 .get_dqblk = gfs2_get_dqblk, 1756 .set_dqblk = gfs2_set_dqblk, 1757 }; 1758 1759 void __init gfs2_quota_hash_init(void) 1760 { 1761 unsigned i; 1762 1763 for(i = 0; i < GFS2_QD_HASH_SIZE; i++) 1764 INIT_HLIST_BL_HEAD(&qd_hash_table[i]); 1765 } 1766