fs/gfs2/quota.c

   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 #define QC_CHANGE 0
  79 #define QC_SYNC 1
  80
  81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
  82 /*                     -> sd_bitmap_lock                              */
  83 static DEFINE_SPINLOCK(qd_lock);
  84 struct list_lru gfs2_qd_lru;
  85
  86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
  87
  88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
  89                                  const struct kqid qid)
  90 {
  91         unsigned int h;
  92
  93         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
  94         h = jhash(&qid, sizeof(struct kqid), h);
  95
  96         return h & GFS2_QD_HASH_MASK;
  97 }
  98
  99 static inline void spin_lock_bucket(unsigned int hash)
 100 {
 101         hlist_bl_lock(&qd_hash_table[hash]);
 102 }
 103
 104 static inline void spin_unlock_bucket(unsigned int hash)
 105 {
 106         hlist_bl_unlock(&qd_hash_table[hash]);
 107 }
 108
 109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 110 {
 111         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
 112         struct gfs2_sbd *sdp = qd->qd_sbd;
 113
 114         kmem_cache_free(gfs2_quotad_cachep, qd);
 115         if (atomic_dec_and_test(&sdp->sd_quota_count))
 116                 wake_up(&sdp->sd_kill_wait);
 117 }
 118
 119 static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
 120 {
 121         struct gfs2_sbd *sdp = qd->qd_sbd;
 122
 123         spin_lock(&qd_lock);
 124         list_del(&qd->qd_list);
 125         spin_unlock(&qd_lock);
 126
 127         spin_lock_bucket(qd->qd_hash);
 128         hlist_bl_del_rcu(&qd->qd_hlist);
 129         spin_unlock_bucket(qd->qd_hash);
 130
 131         if (!gfs2_withdrawn(sdp)) {
 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
 137         gfs2_glock_put(qd->qd_gl);
 138         call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 139 }
 140
 141 static void gfs2_qd_list_dispose(struct list_head *list)
 142 {
 143         struct gfs2_quota_data *qd;
 144
 145         while (!list_empty(list)) {
 146                 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
 147                 list_del(&qd->qd_lru);
 148
 149                 gfs2_qd_dispose(qd);
 150         }
 151 }
 152
 153
 154 static enum lru_status gfs2_qd_isolate(struct list_head *item,
 155                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
 156 {
 157         struct list_head *dispose = arg;
 158         struct gfs2_quota_data *qd =
 159                 list_entry(item, struct gfs2_quota_data, qd_lru);
 160         enum lru_status status;
 161
 162         if (!spin_trylock(&qd->qd_lockref.lock))
 163                 return LRU_SKIP;
 164
 165         status = LRU_SKIP;
 166         if (qd->qd_lockref.count == 0) {
 167                 lockref_mark_dead(&qd->qd_lockref);
 168                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
 169                 status = LRU_REMOVED;
 170         }
 171
 172         spin_unlock(&qd->qd_lockref.lock);
 173         return status;
 174 }
 175
 176 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 177                                          struct shrink_control *sc)
 178 {
 179         LIST_HEAD(dispose);
 180         unsigned long freed;
 181
 182         if (!(sc->gfp_mask & __GFP_FS))
 183                 return SHRINK_STOP;
 184
 185         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 186                                      gfs2_qd_isolate, &dispose);
 187
 188         gfs2_qd_list_dispose(&dispose);
 189
 190         return freed;
 191 }
 192
 193 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 194                                           struct shrink_control *sc)
 195 {
 196         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 197 }
 198
 199 struct shrinker gfs2_qd_shrinker = {
 200         .count_objects = gfs2_qd_shrink_count,
 201         .scan_objects = gfs2_qd_shrink_scan,
 202         .seeks = DEFAULT_SEEKS,
 203         .flags = SHRINKER_NUMA_AWARE,
 204 };
 205
 206
 207 static u64 qd2index(struct gfs2_quota_data *qd)
 208 {
 209         struct kqid qid = qd->qd_id;
 210         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 211                 ((qid.type == USRQUOTA) ? 0 : 1);
 212 }
 213
 214 static u64 qd2offset(struct gfs2_quota_data *qd)
 215 {
 216         u64 offset;
 217
 218         offset = qd2index(qd);
 219         offset *= sizeof(struct gfs2_quota);
 220
 221         return offset;
 222 }
 223
 224 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 225 {
 226         struct gfs2_quota_data *qd;
 227         int error;
 228
 229         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 230         if (!qd)
 231                 return NULL;
 232
 233         qd->qd_sbd = sdp;
 234         qd->qd_lockref.count = 0;
 235         spin_lock_init(&qd->qd_lockref.lock);
 236         qd->qd_id = qid;
 237         qd->qd_slot = -1;
 238         INIT_LIST_HEAD(&qd->qd_lru);
 239         qd->qd_hash = hash;
 240
 241         error = gfs2_glock_get(sdp, qd2index(qd),
 242                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 243         if (error)
 244                 goto fail;
 245
 246         return qd;
 247
 248 fail:
 249         kmem_cache_free(gfs2_quotad_cachep, qd);
 250         return NULL;
 251 }
 252
 253 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 254                                                      const struct gfs2_sbd *sdp,
 255                                                      struct kqid qid)
 256 {
 257         struct gfs2_quota_data *qd;
 258         struct hlist_bl_node *h;
 259
 260         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 261                 if (!qid_eq(qd->qd_id, qid))
 262                         continue;
 263                 if (qd->qd_sbd != sdp)
 264                         continue;
 265                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 266                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 267                         return qd;
 268                 }
 269         }
 270
 271         return NULL;
 272 }
 273
 274
 275 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 276                   struct gfs2_quota_data **qdp)
 277 {
 278         struct gfs2_quota_data *qd, *new_qd;
 279         unsigned int hash = gfs2_qd_hash(sdp, qid);
 280
 281         rcu_read_lock();
 282         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 283         rcu_read_unlock();
 284
 285         if (qd)
 286                 return 0;
 287
 288         new_qd = qd_alloc(hash, sdp, qid);
 289         if (!new_qd)
 290                 return -ENOMEM;
 291
 292         spin_lock(&qd_lock);
 293         spin_lock_bucket(hash);
 294         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 295         if (qd == NULL) {
 296                 new_qd->qd_lockref.count++;
 297                 *qdp = new_qd;
 298                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 299                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 300                 atomic_inc(&sdp->sd_quota_count);
 301         }
 302         spin_unlock_bucket(hash);
 303         spin_unlock(&qd_lock);
 304
 305         if (qd) {
 306                 gfs2_glock_put(new_qd->qd_gl);
 307                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 308         }
 309
 310         return 0;
 311 }
 312
 313
 314 static void qd_hold(struct gfs2_quota_data *qd)
 315 {
 316         struct gfs2_sbd *sdp = qd->qd_sbd;
 317         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 318         lockref_get(&qd->qd_lockref);
 319 }
 320
 321 static void qd_put(struct gfs2_quota_data *qd)
 322 {
 323         struct gfs2_sbd *sdp;
 324
 325         if (lockref_put_or_lock(&qd->qd_lockref))
 326                 return;
 327
 328         BUG_ON(__lockref_is_dead(&qd->qd_lockref));
 329         sdp = qd->qd_sbd;
 330         if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
 331                 lockref_mark_dead(&qd->qd_lockref);
 332                 spin_unlock(&qd->qd_lockref.lock);
 333
 334                 gfs2_qd_dispose(qd);
 335                 return;
 336         }
 337
 338         qd->qd_lockref.count = 0;
 339         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 340         spin_unlock(&qd->qd_lockref.lock);
 341 }
 342
 343 static int slot_get(struct gfs2_quota_data *qd)
 344 {
 345         struct gfs2_sbd *sdp = qd->qd_sbd;
 346         unsigned int bit;
 347         int error = 0;
 348
 349         spin_lock(&sdp->sd_bitmap_lock);
 350         if (qd->qd_slot_count != 0)
 351                 goto out;
 352
 353         error = -ENOSPC;
 354         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
 355         if (bit < sdp->sd_quota_slots) {
 356                 set_bit(bit, sdp->sd_quota_bitmap);
 357                 qd->qd_slot = bit;
 358                 error = 0;
 359 out:
 360                 qd->qd_slot_count++;
 361         }
 362         spin_unlock(&sdp->sd_bitmap_lock);
 363
 364         return error;
 365 }
 366
 367 static void slot_hold(struct gfs2_quota_data *qd)
 368 {
 369         struct gfs2_sbd *sdp = qd->qd_sbd;
 370
 371         spin_lock(&sdp->sd_bitmap_lock);
 372         gfs2_assert(sdp, qd->qd_slot_count);
 373         qd->qd_slot_count++;
 374         spin_unlock(&sdp->sd_bitmap_lock);
 375 }
 376
 377 static void slot_put(struct gfs2_quota_data *qd)
 378 {
 379         struct gfs2_sbd *sdp = qd->qd_sbd;
 380
 381         spin_lock(&sdp->sd_bitmap_lock);
 382         gfs2_assert(sdp, qd->qd_slot_count);
 383         if (!--qd->qd_slot_count) {
 384                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 385                 qd->qd_slot = -1;
 386         }
 387         spin_unlock(&sdp->sd_bitmap_lock);
 388 }
 389
 390 static int bh_get(struct gfs2_quota_data *qd)
 391 {
 392         struct gfs2_sbd *sdp = qd->qd_sbd;
 393         struct inode *inode = sdp->sd_qc_inode;
 394         struct gfs2_inode *ip = GFS2_I(inode);
 395         unsigned int block, offset;
 396         struct buffer_head *bh;
 397         struct iomap iomap = { };
 398         int error;
 399
 400         mutex_lock(&sdp->sd_quota_mutex);
 401
 402         if (qd->qd_bh_count++) {
 403                 mutex_unlock(&sdp->sd_quota_mutex);
 404                 return 0;
 405         }
 406
 407         block = qd->qd_slot / sdp->sd_qc_per_block;
 408         offset = qd->qd_slot % sdp->sd_qc_per_block;
 409
 410         error = gfs2_iomap_get(inode,
 411                                (loff_t)block << inode->i_blkbits,
 412                                i_blocksize(inode), &iomap);
 413         if (error)
 414                 goto fail;
 415         error = -ENOENT;
 416         if (iomap.type != IOMAP_MAPPED)
 417                 goto fail;
 418
 419         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
 420                                DIO_WAIT, 0, &bh);
 421         if (error)
 422                 goto fail;
 423         error = -EIO;
 424         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 425                 goto fail_brelse;
 426
 427         qd->qd_bh = bh;
 428         qd->qd_bh_qc = (struct gfs2_quota_change *)
 429                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 430                  offset * sizeof(struct gfs2_quota_change));
 431
 432         mutex_unlock(&sdp->sd_quota_mutex);
 433
 434         return 0;
 435
 436 fail_brelse:
 437         brelse(bh);
 438 fail:
 439         qd->qd_bh_count--;
 440         mutex_unlock(&sdp->sd_quota_mutex);
 441         return error;
 442 }
 443
 444 static void bh_put(struct gfs2_quota_data *qd)
 445 {
 446         struct gfs2_sbd *sdp = qd->qd_sbd;
 447
 448         mutex_lock(&sdp->sd_quota_mutex);
 449         gfs2_assert(sdp, qd->qd_bh_count);
 450         if (!--qd->qd_bh_count) {
 451                 brelse(qd->qd_bh);
 452                 qd->qd_bh = NULL;
 453                 qd->qd_bh_qc = NULL;
 454         }
 455         mutex_unlock(&sdp->sd_quota_mutex);
 456 }
 457
 458 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 459                          u64 *sync_gen)
 460 {
 461         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 462             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 463             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 464                 return 0;
 465
 466         if (!lockref_get_not_dead(&qd->qd_lockref))
 467                 return 0;
 468
 469         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 470         set_bit(QDF_LOCKED, &qd->qd_flags);
 471         qd->qd_change_sync = qd->qd_change;
 472         slot_hold(qd);
 473         return 1;
 474 }
 475
 476 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 477 {
 478         struct gfs2_quota_data *qd = NULL, *iter;
 479         int error;
 480
 481         *qdp = NULL;
 482
 483         if (sb_rdonly(sdp->sd_vfs))
 484                 return 0;
 485
 486         spin_lock(&qd_lock);
 487
 488         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 489                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 490                         qd = iter;
 491                         break;
 492                 }
 493         }
 494
 495         spin_unlock(&qd_lock);
 496
 497         if (qd) {
 498                 error = bh_get(qd);
 499                 if (error) {
 500                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 501                         slot_put(qd);
 502                         qd_put(qd);
 503                         return error;
 504                 }
 505         }
 506
 507         *qdp = qd;
 508
 509         return 0;
 510 }
 511
 512 static void qd_unlock(struct gfs2_quota_data *qd)
 513 {
 514         gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
 515         clear_bit(QDF_LOCKED, &qd->qd_flags);
 516         bh_put(qd);
 517         slot_put(qd);
 518         qd_put(qd);
 519 }
 520
 521 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 522                     struct gfs2_quota_data **qdp)
 523 {
 524         int error;
 525
 526         error = qd_get(sdp, qid, qdp);
 527         if (error)
 528                 return error;
 529
 530         error = slot_get(*qdp);
 531         if (error)
 532                 goto fail;
 533
 534         error = bh_get(*qdp);
 535         if (error)
 536                 goto fail_slot;
 537
 538         return 0;
 539
 540 fail_slot:
 541         slot_put(*qdp);
 542 fail:
 543         qd_put(*qdp);
 544         return error;
 545 }
 546
 547 static void qdsb_put(struct gfs2_quota_data *qd)
 548 {
 549         bh_put(qd);
 550         slot_put(qd);
 551         qd_put(qd);
 552 }
 553
 554 /**
 555  * gfs2_qa_get - make sure we have a quota allocations data structure,
 556  *               if necessary
 557  * @ip: the inode for this reservation
 558  */
 559 int gfs2_qa_get(struct gfs2_inode *ip)
 560 {
 561         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 562         struct inode *inode = &ip->i_inode;
 563
 564         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 565                 return 0;
 566
 567         spin_lock(&inode->i_lock);
 568         if (ip->i_qadata == NULL) {
 569                 struct gfs2_qadata *tmp;
 570
 571                 spin_unlock(&inode->i_lock);
 572                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 573                 if (!tmp)
 574                         return -ENOMEM;
 575
 576                 spin_lock(&inode->i_lock);
 577                 if (ip->i_qadata == NULL)
 578                         ip->i_qadata = tmp;
 579                 else
 580                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 581         }
 582         ip->i_qadata->qa_ref++;
 583         spin_unlock(&inode->i_lock);
 584         return 0;
 585 }
 586
 587 void gfs2_qa_put(struct gfs2_inode *ip)
 588 {
 589         struct inode *inode = &ip->i_inode;
 590
 591         spin_lock(&inode->i_lock);
 592         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 593                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 594                 ip->i_qadata = NULL;
 595         }
 596         spin_unlock(&inode->i_lock);
 597 }
 598
 599 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 600 {
 601         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 602         struct gfs2_quota_data **qd;
 603         int error;
 604
 605         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 606                 return 0;
 607
 608         error = gfs2_qa_get(ip);
 609         if (error)
 610                 return error;
 611
 612         qd = ip->i_qadata->qa_qd;
 613
 614         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 615             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 616                 error = -EIO;
 617                 gfs2_qa_put(ip);
 618                 goto out;
 619         }
 620
 621         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 622         if (error)
 623                 goto out_unhold;
 624         ip->i_qadata->qa_qd_num++;
 625         qd++;
 626
 627         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 628         if (error)
 629                 goto out_unhold;
 630         ip->i_qadata->qa_qd_num++;
 631         qd++;
 632
 633         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 634             !uid_eq(uid, ip->i_inode.i_uid)) {
 635                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 636                 if (error)
 637                         goto out_unhold;
 638                 ip->i_qadata->qa_qd_num++;
 639                 qd++;
 640         }
 641
 642         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 643             !gid_eq(gid, ip->i_inode.i_gid)) {
 644                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 645                 if (error)
 646                         goto out_unhold;
 647                 ip->i_qadata->qa_qd_num++;
 648                 qd++;
 649         }
 650
 651 out_unhold:
 652         if (error)
 653                 gfs2_quota_unhold(ip);
 654 out:
 655         return error;
 656 }
 657
 658 void gfs2_quota_unhold(struct gfs2_inode *ip)
 659 {
 660         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 661         u32 x;
 662
 663         if (ip->i_qadata == NULL)
 664                 return;
 665
 666         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 667
 668         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 669                 qdsb_put(ip->i_qadata->qa_qd[x]);
 670                 ip->i_qadata->qa_qd[x] = NULL;
 671         }
 672         ip->i_qadata->qa_qd_num = 0;
 673         gfs2_qa_put(ip);
 674 }
 675
 676 static int sort_qd(const void *a, const void *b)
 677 {
 678         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 679         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 680
 681         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 682                 return -1;
 683         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 684                 return 1;
 685         return 0;
 686 }
 687
 688 static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 689 {
 690         struct gfs2_sbd *sdp = qd->qd_sbd;
 691         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 692         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 693         s64 x;
 694
 695         mutex_lock(&sdp->sd_quota_mutex);
 696         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 697
 698         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 699                 qc->qc_change = 0;
 700                 qc->qc_flags = 0;
 701                 if (qd->qd_id.type == USRQUOTA)
 702                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 703                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 704         }
 705
 706         x = be64_to_cpu(qc->qc_change) + change;
 707         qc->qc_change = cpu_to_be64(x);
 708
 709         spin_lock(&qd_lock);
 710         qd->qd_change = x;
 711         spin_unlock(&qd_lock);
 712
 713         if (qc_type == QC_CHANGE) {
 714                 if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 715                         qd_hold(qd);
 716                         slot_hold(qd);
 717                 }
 718         } else {
 719                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 720                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 721                 qc->qc_flags = 0;
 722                 qc->qc_id = 0;
 723                 slot_put(qd);
 724                 qd_put(qd);
 725         }
 726
 727         if (change < 0) /* Reset quiet flag if we freed some blocks */
 728                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 729         mutex_unlock(&sdp->sd_quota_mutex);
 730 }
 731
 732 static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
 733                                   unsigned off, void *buf, unsigned bytes)
 734 {
 735         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 736         struct inode *inode = &ip->i_inode;
 737         struct address_space *mapping = inode->i_mapping;
 738         struct page *page;
 739         struct buffer_head *bh;
 740         u64 blk;
 741         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 742         unsigned to_write = bytes, pg_off = off;
 743
 744         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 745         boff = off % bsize;
 746
 747         page = grab_cache_page(mapping, index);
 748         if (!page)
 749                 return -ENOMEM;
 750         if (!page_has_buffers(page))
 751                 create_empty_buffers(page, bsize, 0);
 752
 753         bh = page_buffers(page);
 754         for(;;) {
 755                 /* Find the beginning block within the page */
 756                 if (pg_off >= ((bnum * bsize) + bsize)) {
 757                         bh = bh->b_this_page;
 758                         bnum++;
 759                         blk++;
 760                         continue;
 761                 }
 762                 if (!buffer_mapped(bh)) {
 763                         gfs2_block_map(inode, blk, bh, 1);
 764                         if (!buffer_mapped(bh))
 765                                 goto unlock_out;
 766                         /* If it's a newly allocated disk block, zero it */
 767                         if (buffer_new(bh))
 768                                 zero_user(page, bnum * bsize, bh->b_size);
 769                 }
 770                 if (PageUptodate(page))
 771                         set_buffer_uptodate(bh);
 772                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 773                         goto unlock_out;
 774                 gfs2_trans_add_data(ip->i_gl, bh);
 775
 776                 /* If we need to write to the next block as well */
 777                 if (to_write > (bsize - boff)) {
 778                         pg_off += (bsize - boff);
 779                         to_write -= (bsize - boff);
 780                         boff = pg_off % bsize;
 781                         continue;
 782                 }
 783                 break;
 784         }
 785
 786         /* Write to the page, now that we have setup the buffer(s) */
 787         memcpy_to_page(page, off, buf, bytes);
 788         flush_dcache_page(page);
 789         unlock_page(page);
 790         put_page(page);
 791
 792         return 0;
 793
 794 unlock_out:
 795         unlock_page(page);
 796         put_page(page);
 797         return -EIO;
 798 }
 799
 800 static int gfs2_write_disk_quota(struct gfs2_sbd *sdp, struct gfs2_quota *qp,
 801                                  loff_t loc)
 802 {
 803         unsigned long pg_beg;
 804         unsigned pg_off, nbytes, overflow = 0;
 805         int error;
 806         void *ptr;
 807
 808         nbytes = sizeof(struct gfs2_quota);
 809
 810         pg_beg = loc >> PAGE_SHIFT;
 811         pg_off = offset_in_page(loc);
 812
 813         /* If the quota straddles a page boundary, split the write in two */
 814         if ((pg_off + nbytes) > PAGE_SIZE)
 815                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 816
 817         ptr = qp;
 818         error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
 819                                        nbytes - overflow);
 820         /* If there's an overflow, write the remaining bytes to the next page */
 821         if (!error && overflow)
 822                 error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
 823                                                ptr + nbytes - overflow,
 824                                                overflow);
 825         return error;
 826 }
 827
 828 /**
 829  * gfs2_adjust_quota - adjust record of current block usage
 830  * @sdp: The superblock
 831  * @loc: Offset of the entry in the quota file
 832  * @change: The amount of usage change to record
 833  * @qd: The quota data
 834  * @fdq: The updated limits to record
 835  *
 836  * This function was mostly borrowed from gfs2_block_truncate_page which was
 837  * in turn mostly borrowed from ext3
 838  *
 839  * Returns: 0 or -ve on error
 840  */
 841
 842 static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
 843                              s64 change, struct gfs2_quota_data *qd,
 844                              struct qc_dqblk *fdq)
 845 {
 846         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 847         struct inode *inode = &ip->i_inode;
 848         struct gfs2_quota q;
 849         int err;
 850         u64 size;
 851
 852         if (gfs2_is_stuffed(ip)) {
 853                 err = gfs2_unstuff_dinode(ip);
 854                 if (err)
 855                         return err;
 856         }
 857
 858         memset(&q, 0, sizeof(struct gfs2_quota));
 859         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 860         if (err < 0)
 861                 return err;
 862
 863         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 864         err = -EIO;
 865         be64_add_cpu(&q.qu_value, change);
 866         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 867                 q.qu_value = 0; /* Never go negative on quota usage */
 868         qd->qd_qb.qb_value = q.qu_value;
 869         if (fdq) {
 870                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 871                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 872                         qd->qd_qb.qb_warn = q.qu_warn;
 873                 }
 874                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 875                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 876                         qd->qd_qb.qb_limit = q.qu_limit;
 877                 }
 878                 if (fdq->d_fieldmask & QC_SPACE) {
 879                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 880                         qd->qd_qb.qb_value = q.qu_value;
 881                 }
 882         }
 883
 884         err = gfs2_write_disk_quota(sdp, &q, loc);
 885         if (!err) {
 886                 size = loc + sizeof(struct gfs2_quota);
 887                 if (size > inode->i_size)
 888                         i_size_write(inode, size);
 889                 inode->i_mtime = inode->i_atime = current_time(inode);
 890                 mark_inode_dirty(inode);
 891                 set_bit(QDF_REFRESH, &qd->qd_flags);
 892         }
 893
 894         return err;
 895 }
 896
 897 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 898 {
 899         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 900         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 901         struct gfs2_alloc_parms ap = { .aflags = 0, };
 902         unsigned int data_blocks, ind_blocks;
 903         struct gfs2_holder *ghs, i_gh;
 904         unsigned int qx, x;
 905         struct gfs2_quota_data *qd;
 906         unsigned reserved;
 907         loff_t offset;
 908         unsigned int nalloc = 0, blocks;
 909         int error;
 910
 911         error = gfs2_qa_get(ip);
 912         if (error)
 913                 return error;
 914
 915         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 916                               &data_blocks, &ind_blocks);
 917
 918         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 919         if (!ghs) {
 920                 error = -ENOMEM;
 921                 goto out;
 922         }
 923
 924         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 925         inode_lock(&ip->i_inode);
 926         for (qx = 0; qx < num_qd; qx++) {
 927                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 928                                            GL_NOCACHE, &ghs[qx]);
 929                 if (error)
 930                         goto out_dq;
 931         }
 932
 933         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 934         if (error)
 935                 goto out_dq;
 936
 937         for (x = 0; x < num_qd; x++) {
 938                 offset = qd2offset(qda[x]);
 939                 if (gfs2_write_alloc_required(ip, offset,
 940                                               sizeof(struct gfs2_quota)))
 941                         nalloc++;
 942         }
 943
 944         /*
 945          * 1 blk for unstuffing inode if stuffed. We add this extra
 946          * block to the reservation unconditionally. If the inode
 947          * doesn't need unstuffing, the block will be released to the
 948          * rgrp since it won't be allocated during the transaction
 949          */
 950         /* +3 in the end for unstuffing block, inode size update block
 951          * and another block in case quota straddles page boundary and
 952          * two blocks need to be updated instead of 1 */
 953         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 954
 955         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 956         ap.target = reserved;
 957         error = gfs2_inplace_reserve(ip, &ap);
 958         if (error)
 959                 goto out_alloc;
 960
 961         if (nalloc)
 962                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 963
 964         error = gfs2_trans_begin(sdp, blocks, 0);
 965         if (error)
 966                 goto out_ipres;
 967
 968         for (x = 0; x < num_qd; x++) {
 969                 qd = qda[x];
 970                 offset = qd2offset(qd);
 971                 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
 972                                                         NULL);
 973                 if (error)
 974                         goto out_end_trans;
 975
 976                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 977                 set_bit(QDF_REFRESH, &qd->qd_flags);
 978         }
 979
 980         error = 0;
 981
 982 out_end_trans:
 983         gfs2_trans_end(sdp);
 984 out_ipres:
 985         gfs2_inplace_release(ip);
 986 out_alloc:
 987         gfs2_glock_dq_uninit(&i_gh);
 988 out_dq:
 989         while (qx--)
 990                 gfs2_glock_dq_uninit(&ghs[qx]);
 991         inode_unlock(&ip->i_inode);
 992         kfree(ghs);
 993         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 994                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 995 out:
 996         gfs2_qa_put(ip);
 997         return error;
 998 }
 999
1000 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
1001 {
1002         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1003         struct gfs2_quota q;
1004         struct gfs2_quota_lvb *qlvb;
1005         loff_t pos;
1006         int error;
1007
1008         memset(&q, 0, sizeof(struct gfs2_quota));
1009         pos = qd2offset(qd);
1010         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1011         if (error < 0)
1012                 return error;
1013
1014         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1015         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1016         qlvb->__pad = 0;
1017         qlvb->qb_limit = q.qu_limit;
1018         qlvb->qb_warn = q.qu_warn;
1019         qlvb->qb_value = q.qu_value;
1020         qd->qd_qb = *qlvb;
1021
1022         return 0;
1023 }
1024
1025 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1026                     struct gfs2_holder *q_gh)
1027 {
1028         struct gfs2_sbd *sdp = qd->qd_sbd;
1029         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1030         struct gfs2_holder i_gh;
1031         int error;
1032
1033         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1034 restart:
1035         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1036         if (error)
1037                 return error;
1038
1039         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1040                 force_refresh = FORCE;
1041
1042         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1043
1044         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1045                 gfs2_glock_dq_uninit(q_gh);
1046                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1047                                            GL_NOCACHE, q_gh);
1048                 if (error)
1049                         return error;
1050
1051                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1052                 if (error)
1053                         goto fail;
1054
1055                 error = update_qd(sdp, qd);
1056                 if (error)
1057                         goto fail_gunlock;
1058
1059                 gfs2_glock_dq_uninit(&i_gh);
1060                 gfs2_glock_dq_uninit(q_gh);
1061                 force_refresh = 0;
1062                 goto restart;
1063         }
1064
1065         return 0;
1066
1067 fail_gunlock:
1068         gfs2_glock_dq_uninit(&i_gh);
1069 fail:
1070         gfs2_glock_dq_uninit(q_gh);
1071         return error;
1072 }
1073
1074 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1075 {
1076         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1077         struct gfs2_quota_data *qd;
1078         u32 x;
1079         int error = 0;
1080
1081         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1082             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1083                 return 0;
1084
1085         error = gfs2_quota_hold(ip, uid, gid);
1086         if (error)
1087                 return error;
1088
1089         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1090              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1091
1092         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1093                 qd = ip->i_qadata->qa_qd[x];
1094                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1095                 if (error)
1096                         break;
1097         }
1098
1099         if (!error)
1100                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1101         else {
1102                 while (x--)
1103                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1104                 gfs2_quota_unhold(ip);
1105         }
1106
1107         return error;
1108 }
1109
1110 static int need_sync(struct gfs2_quota_data *qd)
1111 {
1112         struct gfs2_sbd *sdp = qd->qd_sbd;
1113         struct gfs2_tune *gt = &sdp->sd_tune;
1114         s64 value;
1115         unsigned int num, den;
1116         int do_sync = 1;
1117
1118         if (!qd->qd_qb.qb_limit)
1119                 return 0;
1120
1121         spin_lock(&qd_lock);
1122         value = qd->qd_change;
1123         spin_unlock(&qd_lock);
1124
1125         spin_lock(&gt->gt_spin);
1126         num = gt->gt_quota_scale_num;
1127         den = gt->gt_quota_scale_den;
1128         spin_unlock(&gt->gt_spin);
1129
1130         if (value < 0)
1131                 do_sync = 0;
1132         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1133                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1134                 do_sync = 0;
1135         else {
1136                 value *= gfs2_jindex_size(sdp) * num;
1137                 value = div_s64(value, den);
1138                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1139                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1140                         do_sync = 0;
1141         }
1142
1143         return do_sync;
1144 }
1145
1146 void gfs2_quota_unlock(struct gfs2_inode *ip)
1147 {
1148         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1149         struct gfs2_quota_data *qda[4];
1150         unsigned int count = 0;
1151         u32 x;
1152         int found;
1153
1154         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1155                 return;
1156
1157         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1158                 struct gfs2_quota_data *qd;
1159                 int sync;
1160
1161                 qd = ip->i_qadata->qa_qd[x];
1162                 sync = need_sync(qd);
1163
1164                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1165                 if (!sync)
1166                         continue;
1167
1168                 spin_lock(&qd_lock);
1169                 found = qd_check_sync(sdp, qd, NULL);
1170                 spin_unlock(&qd_lock);
1171
1172                 if (!found)
1173                         continue;
1174
1175                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1176                 if (bh_get(qd)) {
1177                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1178                         slot_put(qd);
1179                         qd_put(qd);
1180                         continue;
1181                 }
1182
1183                 qda[count++] = qd;
1184         }
1185
1186         if (count) {
1187                 do_sync(count, qda);
1188                 for (x = 0; x < count; x++)
1189                         qd_unlock(qda[x]);
1190         }
1191
1192         gfs2_quota_unhold(ip);
1193 }
1194
1195 #define MAX_LINE 256
1196
1197 static int print_message(struct gfs2_quota_data *qd, char *type)
1198 {
1199         struct gfs2_sbd *sdp = qd->qd_sbd;
1200
1201         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1202                 fs_info(sdp, "quota %s for %s %u\n",
1203                         type,
1204                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1205                         from_kqid(&init_user_ns, qd->qd_id));
1206
1207         return 0;
1208 }
1209
1210 /**
1211  * gfs2_quota_check - check if allocating new blocks will exceed quota
1212  * @ip:  The inode for which this check is being performed
1213  * @uid: The uid to check against
1214  * @gid: The gid to check against
1215  * @ap:  The allocation parameters. ap->target contains the requested
1216  *       blocks. ap->min_target, if set, contains the minimum blks
1217  *       requested.
1218  *
1219  * Returns: 0 on success.
1220  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1221  *                  quota must allow at least min_req blks for success and
1222  *                  ap->allowed is set to the number of blocks allowed
1223  *
1224  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1225  *                  of blocks available.
1226  */
1227 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1228                      struct gfs2_alloc_parms *ap)
1229 {
1230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1231         struct gfs2_quota_data *qd;
1232         s64 value, warn, limit;
1233         u32 x;
1234         int error = 0;
1235
1236         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1237         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1238                 return 0;
1239
1240         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1241                 qd = ip->i_qadata->qa_qd[x];
1242
1243                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1244                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1245                         continue;
1246
1247                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1248                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1249                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1250                 spin_lock(&qd_lock);
1251                 value += qd->qd_change;
1252                 spin_unlock(&qd_lock);
1253
1254                 if (limit > 0 && (limit - value) < ap->allowed)
1255                         ap->allowed = limit - value;
1256                 /* If we can't meet the target */
1257                 if (limit && limit < (value + (s64)ap->target)) {
1258                         /* If no min_target specified or we don't meet
1259                          * min_target, return -EDQUOT */
1260                         if (!ap->min_target || ap->min_target > ap->allowed) {
1261                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1262                                                       &qd->qd_flags)) {
1263                                         print_message(qd, "exceeded");
1264                                         quota_send_warning(qd->qd_id,
1265                                                            sdp->sd_vfs->s_dev,
1266                                                            QUOTA_NL_BHARDWARN);
1267                                 }
1268                                 error = -EDQUOT;
1269                                 break;
1270                         }
1271                 } else if (warn && warn < value &&
1272                            time_after_eq(jiffies, qd->qd_last_warn +
1273                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1274                                          * HZ)) {
1275                         quota_send_warning(qd->qd_id,
1276                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1277                         error = print_message(qd, "warning");
1278                         qd->qd_last_warn = jiffies;
1279                 }
1280         }
1281         return error;
1282 }
1283
1284 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1285                        kuid_t uid, kgid_t gid)
1286 {
1287         struct gfs2_quota_data *qd;
1288         u32 x;
1289         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1290
1291         if ((sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1292             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) ||
1293             gfs2_assert_warn(sdp, change))
1294                 return;
1295         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1296                 return;
1297
1298         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1299                                  ip->i_qadata->qa_ref > 0))
1300                 return;
1301         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1302                 qd = ip->i_qadata->qa_qd[x];
1303
1304                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1305                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1306                         do_qc(qd, change, QC_CHANGE);
1307                 }
1308         }
1309 }
1310
1311 int gfs2_quota_sync(struct super_block *sb, int type)
1312 {
1313         struct gfs2_sbd *sdp = sb->s_fs_info;
1314         struct gfs2_quota_data **qda;
1315         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1316         unsigned int num_qd;
1317         unsigned int x;
1318         int error = 0;
1319
1320         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1321         if (!qda)
1322                 return -ENOMEM;
1323
1324         mutex_lock(&sdp->sd_quota_sync_mutex);
1325         sdp->sd_quota_sync_gen++;
1326
1327         do {
1328                 num_qd = 0;
1329
1330                 for (;;) {
1331                         error = qd_fish(sdp, qda + num_qd);
1332                         if (error || !qda[num_qd])
1333                                 break;
1334                         if (++num_qd == max_qd)
1335                                 break;
1336                 }
1337
1338                 if (num_qd) {
1339                         if (!error)
1340                                 error = do_sync(num_qd, qda);
1341                         if (!error)
1342                                 for (x = 0; x < num_qd; x++)
1343                                         qda[x]->qd_sync_gen =
1344                                                 sdp->sd_quota_sync_gen;
1345
1346                         for (x = 0; x < num_qd; x++)
1347                                 qd_unlock(qda[x]);
1348                 }
1349         } while (!error && num_qd == max_qd);
1350
1351         mutex_unlock(&sdp->sd_quota_sync_mutex);
1352         kfree(qda);
1353
1354         return error;
1355 }
1356
1357 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1358 {
1359         struct gfs2_quota_data *qd;
1360         struct gfs2_holder q_gh;
1361         int error;
1362
1363         error = qd_get(sdp, qid, &qd);
1364         if (error)
1365                 return error;
1366
1367         error = do_glock(qd, FORCE, &q_gh);
1368         if (!error)
1369                 gfs2_glock_dq_uninit(&q_gh);
1370
1371         qd_put(qd);
1372         return error;
1373 }
1374
1375 int gfs2_quota_init(struct gfs2_sbd *sdp)
1376 {
1377         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1378         u64 size = i_size_read(sdp->sd_qc_inode);
1379         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1380         unsigned int x, slot = 0;
1381         unsigned int found = 0;
1382         unsigned int hash;
1383         unsigned int bm_size;
1384         u64 dblock;
1385         u32 extlen = 0;
1386         int error;
1387
1388         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1389                 return -EIO;
1390
1391         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1392         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1393         bm_size *= sizeof(unsigned long);
1394         error = -ENOMEM;
1395         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1396         if (sdp->sd_quota_bitmap == NULL)
1397                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1398                                                  __GFP_ZERO);
1399         if (!sdp->sd_quota_bitmap)
1400                 return error;
1401
1402         for (x = 0; x < blocks; x++) {
1403                 struct buffer_head *bh;
1404                 const struct gfs2_quota_change *qc;
1405                 unsigned int y;
1406
1407                 if (!extlen) {
1408                         extlen = 32;
1409                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1410                         if (error)
1411                                 goto fail;
1412                 }
1413                 error = -EIO;
1414                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1415                 if (!bh)
1416                         goto fail;
1417                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1418                         brelse(bh);
1419                         goto fail;
1420                 }
1421
1422                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1423                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1424                      y++, slot++) {
1425                         struct gfs2_quota_data *qd;
1426                         s64 qc_change = be64_to_cpu(qc->qc_change);
1427                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1428                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1429                                                 USRQUOTA : GRPQUOTA;
1430                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1431                                                       be32_to_cpu(qc->qc_id));
1432                         qc++;
1433                         if (!qc_change)
1434                                 continue;
1435
1436                         hash = gfs2_qd_hash(sdp, qc_id);
1437                         qd = qd_alloc(hash, sdp, qc_id);
1438                         if (qd == NULL) {
1439                                 brelse(bh);
1440                                 goto fail;
1441                         }
1442
1443                         set_bit(QDF_CHANGE, &qd->qd_flags);
1444                         qd->qd_change = qc_change;
1445                         qd->qd_slot = slot;
1446                         qd->qd_slot_count = 1;
1447
1448                         spin_lock(&qd_lock);
1449                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1450                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1451                         atomic_inc(&sdp->sd_quota_count);
1452                         spin_unlock(&qd_lock);
1453
1454                         spin_lock_bucket(hash);
1455                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1456                         spin_unlock_bucket(hash);
1457
1458                         found++;
1459                 }
1460
1461                 brelse(bh);
1462                 dblock++;
1463                 extlen--;
1464         }
1465
1466         if (found)
1467                 fs_info(sdp, "found %u quota changes\n", found);
1468
1469         return 0;
1470
1471 fail:
1472         gfs2_quota_cleanup(sdp);
1473         return error;
1474 }
1475
1476 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1477 {
1478         struct gfs2_quota_data *qd;
1479         LIST_HEAD(dispose);
1480         int count;
1481
1482         BUG_ON(test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1483
1484         spin_lock(&qd_lock);
1485         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1486                 spin_lock(&qd->qd_lockref.lock);
1487                 if (qd->qd_lockref.count != 0) {
1488                         spin_unlock(&qd->qd_lockref.lock);
1489                         continue;
1490                 }
1491                 lockref_mark_dead(&qd->qd_lockref);
1492                 spin_unlock(&qd->qd_lockref.lock);
1493
1494                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1495                 list_add(&qd->qd_lru, &dispose);
1496         }
1497         spin_unlock(&qd_lock);
1498
1499         gfs2_qd_list_dispose(&dispose);
1500
1501         wait_event_timeout(sdp->sd_kill_wait,
1502                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1503                 HZ * 60);
1504
1505         if (count != 0)
1506                 fs_err(sdp, "%d left-over quota data objects\n", count);
1507
1508         kvfree(sdp->sd_quota_bitmap);
1509         sdp->sd_quota_bitmap = NULL;
1510 }
1511
1512 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1513 {
1514         if (error == 0 || error == -EROFS)
1515                 return;
1516         if (!gfs2_withdrawn(sdp)) {
1517                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1518                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1519                 wake_up(&sdp->sd_logd_waitq);
1520         }
1521 }
1522
1523 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1524                                int (*fxn)(struct super_block *sb, int type),
1525                                unsigned long t, unsigned long *timeo,
1526                                unsigned int *new_timeo)
1527 {
1528         if (t >= *timeo) {
1529                 int error = fxn(sdp->sd_vfs, 0);
1530                 quotad_error(sdp, msg, error);
1531                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1532         } else {
1533                 *timeo -= t;
1534         }
1535 }
1536
1537 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1538         if (!sdp->sd_statfs_force_sync) {
1539                 sdp->sd_statfs_force_sync = 1;
1540                 wake_up(&sdp->sd_quota_wait);
1541         }
1542 }
1543
1544
1545 /**
1546  * gfs2_quotad - Write cached quota changes into the quota file
1547  * @data: Pointer to GFS2 superblock
1548  *
1549  */
1550
1551 int gfs2_quotad(void *data)
1552 {
1553         struct gfs2_sbd *sdp = data;
1554         struct gfs2_tune *tune = &sdp->sd_tune;
1555         unsigned long statfs_timeo = 0;
1556         unsigned long quotad_timeo = 0;
1557         unsigned long t = 0;
1558
1559         while (!kthread_should_stop()) {
1560                 if (gfs2_withdrawn(sdp))
1561                         break;
1562
1563                 /* Update the master statfs file */
1564                 if (sdp->sd_statfs_force_sync) {
1565                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1566                         quotad_error(sdp, "statfs", error);
1567                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1568                 }
1569                 else
1570                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1571                                            &statfs_timeo,
1572                                            &tune->gt_statfs_quantum);
1573
1574                 /* Update quota file */
1575                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1576                                    &quotad_timeo, &tune->gt_quota_quantum);
1577
1578                 try_to_freeze();
1579
1580                 t = min(quotad_timeo, statfs_timeo);
1581
1582                 t = wait_event_interruptible_timeout(sdp->sd_quota_wait,
1583                                 sdp->sd_statfs_force_sync ||
1584                                 gfs2_withdrawn(sdp) ||
1585                                 kthread_should_stop(),
1586                                 t);
1587
1588                 if (sdp->sd_statfs_force_sync)
1589                         t = 0;
1590         }
1591
1592         return 0;
1593 }
1594
1595 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1596 {
1597         struct gfs2_sbd *sdp = sb->s_fs_info;
1598
1599         memset(state, 0, sizeof(*state));
1600
1601         switch (sdp->sd_args.ar_quota) {
1602         case GFS2_QUOTA_QUIET:
1603                 fallthrough;
1604         case GFS2_QUOTA_ON:
1605                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1606                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1607                 fallthrough;
1608         case GFS2_QUOTA_ACCOUNT:
1609                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1610                                                   QCI_SYSFILE;
1611                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1612                                                   QCI_SYSFILE;
1613                 break;
1614         case GFS2_QUOTA_OFF:
1615                 break;
1616         }
1617         if (sdp->sd_quota_inode) {
1618                 state->s_state[USRQUOTA].ino =
1619                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1620                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1621         }
1622         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1623         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1624         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1625         return 0;
1626 }
1627
1628 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1629                           struct qc_dqblk *fdq)
1630 {
1631         struct gfs2_sbd *sdp = sb->s_fs_info;
1632         struct gfs2_quota_lvb *qlvb;
1633         struct gfs2_quota_data *qd;
1634         struct gfs2_holder q_gh;
1635         int error;
1636
1637         memset(fdq, 0, sizeof(*fdq));
1638
1639         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1640                 return -ESRCH; /* Crazy XFS error code */
1641
1642         if ((qid.type != USRQUOTA) &&
1643             (qid.type != GRPQUOTA))
1644                 return -EINVAL;
1645
1646         error = qd_get(sdp, qid, &qd);
1647         if (error)
1648                 return error;
1649         error = do_glock(qd, FORCE, &q_gh);
1650         if (error)
1651                 goto out;
1652
1653         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1654         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1655         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1656         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1657
1658         gfs2_glock_dq_uninit(&q_gh);
1659 out:
1660         qd_put(qd);
1661         return error;
1662 }
1663
1664 /* GFS2 only supports a subset of the XFS fields */
1665 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1666
1667 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1668                           struct qc_dqblk *fdq)
1669 {
1670         struct gfs2_sbd *sdp = sb->s_fs_info;
1671         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1672         struct gfs2_quota_data *qd;
1673         struct gfs2_holder q_gh, i_gh;
1674         unsigned int data_blocks, ind_blocks;
1675         unsigned int blocks = 0;
1676         int alloc_required;
1677         loff_t offset;
1678         int error;
1679
1680         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1681                 return -ESRCH; /* Crazy XFS error code */
1682
1683         if ((qid.type != USRQUOTA) &&
1684             (qid.type != GRPQUOTA))
1685                 return -EINVAL;
1686
1687         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1688                 return -EINVAL;
1689
1690         error = qd_get(sdp, qid, &qd);
1691         if (error)
1692                 return error;
1693
1694         error = gfs2_qa_get(ip);
1695         if (error)
1696                 goto out_put;
1697
1698         inode_lock(&ip->i_inode);
1699         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1700         if (error)
1701                 goto out_unlockput;
1702         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1703         if (error)
1704                 goto out_q;
1705
1706         /* Check for existing entry, if none then alloc new blocks */
1707         error = update_qd(sdp, qd);
1708         if (error)
1709                 goto out_i;
1710
1711         /* If nothing has changed, this is a no-op */
1712         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1713             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1714                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1715
1716         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1717             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1718                 fdq->d_fieldmask ^= QC_SPC_HARD;
1719
1720         if ((fdq->d_fieldmask & QC_SPACE) &&
1721             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1722                 fdq->d_fieldmask ^= QC_SPACE;
1723
1724         if (fdq->d_fieldmask == 0)
1725                 goto out_i;
1726
1727         offset = qd2offset(qd);
1728         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1729         if (gfs2_is_stuffed(ip))
1730                 alloc_required = 1;
1731         if (alloc_required) {
1732                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1733                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1734                                        &data_blocks, &ind_blocks);
1735                 blocks = 1 + data_blocks + ind_blocks;
1736                 ap.target = blocks;
1737                 error = gfs2_inplace_reserve(ip, &ap);
1738                 if (error)
1739                         goto out_i;
1740                 blocks += gfs2_rg_blocks(ip, blocks);
1741         }
1742
1743         /* Some quotas span block boundaries and can update two blocks,
1744            adding an extra block to the transaction to handle such quotas */
1745         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1746         if (error)
1747                 goto out_release;
1748
1749         /* Apply changes */
1750         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1751         if (!error)
1752                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1753
1754         gfs2_trans_end(sdp);
1755 out_release:
1756         if (alloc_required)
1757                 gfs2_inplace_release(ip);
1758 out_i:
1759         gfs2_glock_dq_uninit(&i_gh);
1760 out_q:
1761         gfs2_glock_dq_uninit(&q_gh);
1762 out_unlockput:
1763         gfs2_qa_put(ip);
1764         inode_unlock(&ip->i_inode);
1765 out_put:
1766         qd_put(qd);
1767         return error;
1768 }
1769
1770 const struct quotactl_ops gfs2_quotactl_ops = {
1771         .quota_sync     = gfs2_quota_sync,
1772         .get_state      = gfs2_quota_get_state,
1773         .get_dqblk      = gfs2_get_dqblk,
1774         .set_dqblk      = gfs2_set_dqblk,
1775 };
1776
1777 void __init gfs2_quota_hash_init(void)
1778 {
1779         unsigned i;
1780
1781         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1782                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1783 }