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_inode *ip, unsigned long index,
 733                                   unsigned off, void *buf, unsigned bytes)
 734 {
 735         struct inode *inode = &ip->i_inode;
 736         struct gfs2_sbd *sdp = GFS2_SB(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         int done = 0;
 744
 745         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 746         boff = off % bsize;
 747
 748         page = grab_cache_page(mapping, index);
 749         if (!page)
 750                 return -ENOMEM;
 751         if (!page_has_buffers(page))
 752                 create_empty_buffers(page, bsize, 0);
 753
 754         bh = page_buffers(page);
 755         while (!done) {
 756                 /* Find the beginning block within the page */
 757                 if (pg_off >= ((bnum * bsize) + bsize)) {
 758                         bh = bh->b_this_page;
 759                         bnum++;
 760                         blk++;
 761                         continue;
 762                 }
 763                 if (!buffer_mapped(bh)) {
 764                         gfs2_block_map(inode, blk, bh, 1);
 765                         if (!buffer_mapped(bh))
 766                                 goto unlock_out;
 767                         /* If it's a newly allocated disk block, zero it */
 768                         if (buffer_new(bh))
 769                                 zero_user(page, bnum * bsize, bh->b_size);
 770                 }
 771                 if (PageUptodate(page))
 772                         set_buffer_uptodate(bh);
 773                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 774                         goto unlock_out;
 775                 gfs2_trans_add_data(ip->i_gl, bh);
 776
 777                 /* If we need to write to the next block as well */
 778                 if (to_write > (bsize - boff)) {
 779                         pg_off += (bsize - boff);
 780                         to_write -= (bsize - boff);
 781                         boff = pg_off % bsize;
 782                         continue;
 783                 }
 784                 done = 1;
 785         }
 786
 787         /* Write to the page, now that we have setup the buffer(s) */
 788         memcpy_to_page(page, off, buf, bytes);
 789         flush_dcache_page(page);
 790         unlock_page(page);
 791         put_page(page);
 792
 793         return 0;
 794
 795 unlock_out:
 796         unlock_page(page);
 797         put_page(page);
 798         return -EIO;
 799 }
 800
 801 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
 802                                  loff_t loc)
 803 {
 804         unsigned long pg_beg;
 805         unsigned pg_off, nbytes, overflow = 0;
 806         int pg_oflow = 0, error;
 807         void *ptr;
 808
 809         nbytes = sizeof(struct gfs2_quota);
 810
 811         pg_beg = loc >> PAGE_SHIFT;
 812         pg_off = offset_in_page(loc);
 813
 814         /* If the quota straddles a page boundary, split the write in two */
 815         if ((pg_off + nbytes) > PAGE_SIZE) {
 816                 pg_oflow = 1;
 817                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 818         }
 819
 820         ptr = qp;
 821         error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
 822                                        nbytes - overflow);
 823         /* If there's an overflow, write the remaining bytes to the next page */
 824         if (!error && pg_oflow)
 825                 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
 826                                                ptr + nbytes - overflow,
 827                                                overflow);
 828         return error;
 829 }
 830
 831 /**
 832  * gfs2_adjust_quota - adjust record of current block usage
 833  * @sdp: The superblock
 834  * @loc: Offset of the entry in the quota file
 835  * @change: The amount of usage change to record
 836  * @qd: The quota data
 837  * @fdq: The updated limits to record
 838  *
 839  * This function was mostly borrowed from gfs2_block_truncate_page which was
 840  * in turn mostly borrowed from ext3
 841  *
 842  * Returns: 0 or -ve on error
 843  */
 844
 845 static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
 846                              s64 change, struct gfs2_quota_data *qd,
 847                              struct qc_dqblk *fdq)
 848 {
 849         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 850         struct inode *inode = &ip->i_inode;
 851         struct gfs2_quota q;
 852         int err;
 853         u64 size;
 854
 855         if (gfs2_is_stuffed(ip)) {
 856                 err = gfs2_unstuff_dinode(ip);
 857                 if (err)
 858                         return err;
 859         }
 860
 861         memset(&q, 0, sizeof(struct gfs2_quota));
 862         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 863         if (err < 0)
 864                 return err;
 865
 866         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 867         err = -EIO;
 868         be64_add_cpu(&q.qu_value, change);
 869         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 870                 q.qu_value = 0; /* Never go negative on quota usage */
 871         qd->qd_qb.qb_value = q.qu_value;
 872         if (fdq) {
 873                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 874                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 875                         qd->qd_qb.qb_warn = q.qu_warn;
 876                 }
 877                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 878                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 879                         qd->qd_qb.qb_limit = q.qu_limit;
 880                 }
 881                 if (fdq->d_fieldmask & QC_SPACE) {
 882                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 883                         qd->qd_qb.qb_value = q.qu_value;
 884                 }
 885         }
 886
 887         err = gfs2_write_disk_quota(ip, &q, loc);
 888         if (!err) {
 889                 size = loc + sizeof(struct gfs2_quota);
 890                 if (size > inode->i_size)
 891                         i_size_write(inode, size);
 892                 inode->i_mtime = inode->i_atime = current_time(inode);
 893                 mark_inode_dirty(inode);
 894                 set_bit(QDF_REFRESH, &qd->qd_flags);
 895         }
 896
 897         return err;
 898 }
 899
 900 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 901 {
 902         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 903         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 904         struct gfs2_alloc_parms ap = { .aflags = 0, };
 905         unsigned int data_blocks, ind_blocks;
 906         struct gfs2_holder *ghs, i_gh;
 907         unsigned int qx, x;
 908         struct gfs2_quota_data *qd;
 909         unsigned reserved;
 910         loff_t offset;
 911         unsigned int nalloc = 0, blocks;
 912         int error;
 913
 914         error = gfs2_qa_get(ip);
 915         if (error)
 916                 return error;
 917
 918         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 919                               &data_blocks, &ind_blocks);
 920
 921         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 922         if (!ghs) {
 923                 error = -ENOMEM;
 924                 goto out;
 925         }
 926
 927         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 928         inode_lock(&ip->i_inode);
 929         for (qx = 0; qx < num_qd; qx++) {
 930                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 931                                            GL_NOCACHE, &ghs[qx]);
 932                 if (error)
 933                         goto out_dq;
 934         }
 935
 936         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 937         if (error)
 938                 goto out_dq;
 939
 940         for (x = 0; x < num_qd; x++) {
 941                 offset = qd2offset(qda[x]);
 942                 if (gfs2_write_alloc_required(ip, offset,
 943                                               sizeof(struct gfs2_quota)))
 944                         nalloc++;
 945         }
 946
 947         /*
 948          * 1 blk for unstuffing inode if stuffed. We add this extra
 949          * block to the reservation unconditionally. If the inode
 950          * doesn't need unstuffing, the block will be released to the
 951          * rgrp since it won't be allocated during the transaction
 952          */
 953         /* +3 in the end for unstuffing block, inode size update block
 954          * and another block in case quota straddles page boundary and
 955          * two blocks need to be updated instead of 1 */
 956         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 957
 958         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 959         ap.target = reserved;
 960         error = gfs2_inplace_reserve(ip, &ap);
 961         if (error)
 962                 goto out_alloc;
 963
 964         if (nalloc)
 965                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 966
 967         error = gfs2_trans_begin(sdp, blocks, 0);
 968         if (error)
 969                 goto out_ipres;
 970
 971         for (x = 0; x < num_qd; x++) {
 972                 qd = qda[x];
 973                 offset = qd2offset(qd);
 974                 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
 975                                                         NULL);
 976                 if (error)
 977                         goto out_end_trans;
 978
 979                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 980                 set_bit(QDF_REFRESH, &qd->qd_flags);
 981         }
 982
 983         error = 0;
 984
 985 out_end_trans:
 986         gfs2_trans_end(sdp);
 987 out_ipres:
 988         gfs2_inplace_release(ip);
 989 out_alloc:
 990         gfs2_glock_dq_uninit(&i_gh);
 991 out_dq:
 992         while (qx--)
 993                 gfs2_glock_dq_uninit(&ghs[qx]);
 994         inode_unlock(&ip->i_inode);
 995         kfree(ghs);
 996         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 997                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 998 out:
 999         gfs2_qa_put(ip);
1000         return error;
1001 }
1002
1003 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
1004 {
1005         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1006         struct gfs2_quota q;
1007         struct gfs2_quota_lvb *qlvb;
1008         loff_t pos;
1009         int error;
1010
1011         memset(&q, 0, sizeof(struct gfs2_quota));
1012         pos = qd2offset(qd);
1013         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1014         if (error < 0)
1015                 return error;
1016
1017         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1018         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1019         qlvb->__pad = 0;
1020         qlvb->qb_limit = q.qu_limit;
1021         qlvb->qb_warn = q.qu_warn;
1022         qlvb->qb_value = q.qu_value;
1023         qd->qd_qb = *qlvb;
1024
1025         return 0;
1026 }
1027
1028 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1029                     struct gfs2_holder *q_gh)
1030 {
1031         struct gfs2_sbd *sdp = qd->qd_sbd;
1032         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1033         struct gfs2_holder i_gh;
1034         int error;
1035
1036         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1037 restart:
1038         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1039         if (error)
1040                 return error;
1041
1042         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1043                 force_refresh = FORCE;
1044
1045         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1046
1047         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1048                 gfs2_glock_dq_uninit(q_gh);
1049                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1050                                            GL_NOCACHE, q_gh);
1051                 if (error)
1052                         return error;
1053
1054                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1055                 if (error)
1056                         goto fail;
1057
1058                 error = update_qd(sdp, qd);
1059                 if (error)
1060                         goto fail_gunlock;
1061
1062                 gfs2_glock_dq_uninit(&i_gh);
1063                 gfs2_glock_dq_uninit(q_gh);
1064                 force_refresh = 0;
1065                 goto restart;
1066         }
1067
1068         return 0;
1069
1070 fail_gunlock:
1071         gfs2_glock_dq_uninit(&i_gh);
1072 fail:
1073         gfs2_glock_dq_uninit(q_gh);
1074         return error;
1075 }
1076
1077 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1078 {
1079         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1080         struct gfs2_quota_data *qd;
1081         u32 x;
1082         int error = 0;
1083
1084         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1085             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1086                 return 0;
1087
1088         error = gfs2_quota_hold(ip, uid, gid);
1089         if (error)
1090                 return error;
1091
1092         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1093              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1094
1095         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1096                 qd = ip->i_qadata->qa_qd[x];
1097                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1098                 if (error)
1099                         break;
1100         }
1101
1102         if (!error)
1103                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1104         else {
1105                 while (x--)
1106                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1107                 gfs2_quota_unhold(ip);
1108         }
1109
1110         return error;
1111 }
1112
1113 static int need_sync(struct gfs2_quota_data *qd)
1114 {
1115         struct gfs2_sbd *sdp = qd->qd_sbd;
1116         struct gfs2_tune *gt = &sdp->sd_tune;
1117         s64 value;
1118         unsigned int num, den;
1119         int do_sync = 1;
1120
1121         if (!qd->qd_qb.qb_limit)
1122                 return 0;
1123
1124         spin_lock(&qd_lock);
1125         value = qd->qd_change;
1126         spin_unlock(&qd_lock);
1127
1128         spin_lock(&gt->gt_spin);
1129         num = gt->gt_quota_scale_num;
1130         den = gt->gt_quota_scale_den;
1131         spin_unlock(&gt->gt_spin);
1132
1133         if (value < 0)
1134                 do_sync = 0;
1135         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1136                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1137                 do_sync = 0;
1138         else {
1139                 value *= gfs2_jindex_size(sdp) * num;
1140                 value = div_s64(value, den);
1141                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1142                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1143                         do_sync = 0;
1144         }
1145
1146         return do_sync;
1147 }
1148
1149 void gfs2_quota_unlock(struct gfs2_inode *ip)
1150 {
1151         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1152         struct gfs2_quota_data *qda[4];
1153         unsigned int count = 0;
1154         u32 x;
1155         int found;
1156
1157         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1158                 return;
1159
1160         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1161                 struct gfs2_quota_data *qd;
1162                 int sync;
1163
1164                 qd = ip->i_qadata->qa_qd[x];
1165                 sync = need_sync(qd);
1166
1167                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1168                 if (!sync)
1169                         continue;
1170
1171                 spin_lock(&qd_lock);
1172                 found = qd_check_sync(sdp, qd, NULL);
1173                 spin_unlock(&qd_lock);
1174
1175                 if (!found)
1176                         continue;
1177
1178                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1179                 if (bh_get(qd)) {
1180                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1181                         slot_put(qd);
1182                         qd_put(qd);
1183                         continue;
1184                 }
1185
1186                 qda[count++] = qd;
1187         }
1188
1189         if (count) {
1190                 do_sync(count, qda);
1191                 for (x = 0; x < count; x++)
1192                         qd_unlock(qda[x]);
1193         }
1194
1195         gfs2_quota_unhold(ip);
1196 }
1197
1198 #define MAX_LINE 256
1199
1200 static int print_message(struct gfs2_quota_data *qd, char *type)
1201 {
1202         struct gfs2_sbd *sdp = qd->qd_sbd;
1203
1204         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1205                 fs_info(sdp, "quota %s for %s %u\n",
1206                         type,
1207                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1208                         from_kqid(&init_user_ns, qd->qd_id));
1209
1210         return 0;
1211 }
1212
1213 /**
1214  * gfs2_quota_check - check if allocating new blocks will exceed quota
1215  * @ip:  The inode for which this check is being performed
1216  * @uid: The uid to check against
1217  * @gid: The gid to check against
1218  * @ap:  The allocation parameters. ap->target contains the requested
1219  *       blocks. ap->min_target, if set, contains the minimum blks
1220  *       requested.
1221  *
1222  * Returns: 0 on success.
1223  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1224  *                  quota must allow at least min_req blks for success and
1225  *                  ap->allowed is set to the number of blocks allowed
1226  *
1227  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1228  *                  of blocks available.
1229  */
1230 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1231                      struct gfs2_alloc_parms *ap)
1232 {
1233         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1234         struct gfs2_quota_data *qd;
1235         s64 value, warn, limit;
1236         u32 x;
1237         int error = 0;
1238
1239         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1240         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1241                 return 0;
1242
1243         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1244                 qd = ip->i_qadata->qa_qd[x];
1245
1246                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1247                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1248                         continue;
1249
1250                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1251                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1252                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1253                 spin_lock(&qd_lock);
1254                 value += qd->qd_change;
1255                 spin_unlock(&qd_lock);
1256
1257                 if (limit > 0 && (limit - value) < ap->allowed)
1258                         ap->allowed = limit - value;
1259                 /* If we can't meet the target */
1260                 if (limit && limit < (value + (s64)ap->target)) {
1261                         /* If no min_target specified or we don't meet
1262                          * min_target, return -EDQUOT */
1263                         if (!ap->min_target || ap->min_target > ap->allowed) {
1264                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1265                                                       &qd->qd_flags)) {
1266                                         print_message(qd, "exceeded");
1267                                         quota_send_warning(qd->qd_id,
1268                                                            sdp->sd_vfs->s_dev,
1269                                                            QUOTA_NL_BHARDWARN);
1270                                 }
1271                                 error = -EDQUOT;
1272                                 break;
1273                         }
1274                 } else if (warn && warn < value &&
1275                            time_after_eq(jiffies, qd->qd_last_warn +
1276                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1277                                          * HZ)) {
1278                         quota_send_warning(qd->qd_id,
1279                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1280                         error = print_message(qd, "warning");
1281                         qd->qd_last_warn = jiffies;
1282                 }
1283         }
1284         return error;
1285 }
1286
1287 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1288                        kuid_t uid, kgid_t gid)
1289 {
1290         struct gfs2_quota_data *qd;
1291         u32 x;
1292         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1293
1294         if ((sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1295             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) ||
1296             gfs2_assert_warn(sdp, change))
1297                 return;
1298         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1299                 return;
1300
1301         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1302                                  ip->i_qadata->qa_ref > 0))
1303                 return;
1304         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1305                 qd = ip->i_qadata->qa_qd[x];
1306
1307                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1308                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1309                         do_qc(qd, change, QC_CHANGE);
1310                 }
1311         }
1312 }
1313
1314 int gfs2_quota_sync(struct super_block *sb, int type)
1315 {
1316         struct gfs2_sbd *sdp = sb->s_fs_info;
1317         struct gfs2_quota_data **qda;
1318         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1319         unsigned int num_qd;
1320         unsigned int x;
1321         int error = 0;
1322
1323         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1324         if (!qda)
1325                 return -ENOMEM;
1326
1327         mutex_lock(&sdp->sd_quota_sync_mutex);
1328         sdp->sd_quota_sync_gen++;
1329
1330         do {
1331                 num_qd = 0;
1332
1333                 for (;;) {
1334                         error = qd_fish(sdp, qda + num_qd);
1335                         if (error || !qda[num_qd])
1336                                 break;
1337                         if (++num_qd == max_qd)
1338                                 break;
1339                 }
1340
1341                 if (num_qd) {
1342                         if (!error)
1343                                 error = do_sync(num_qd, qda);
1344                         if (!error)
1345                                 for (x = 0; x < num_qd; x++)
1346                                         qda[x]->qd_sync_gen =
1347                                                 sdp->sd_quota_sync_gen;
1348
1349                         for (x = 0; x < num_qd; x++)
1350                                 qd_unlock(qda[x]);
1351                 }
1352         } while (!error && num_qd == max_qd);
1353
1354         mutex_unlock(&sdp->sd_quota_sync_mutex);
1355         kfree(qda);
1356
1357         return error;
1358 }
1359
1360 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1361 {
1362         struct gfs2_quota_data *qd;
1363         struct gfs2_holder q_gh;
1364         int error;
1365
1366         error = qd_get(sdp, qid, &qd);
1367         if (error)
1368                 return error;
1369
1370         error = do_glock(qd, FORCE, &q_gh);
1371         if (!error)
1372                 gfs2_glock_dq_uninit(&q_gh);
1373
1374         qd_put(qd);
1375         return error;
1376 }
1377
1378 int gfs2_quota_init(struct gfs2_sbd *sdp)
1379 {
1380         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1381         u64 size = i_size_read(sdp->sd_qc_inode);
1382         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1383         unsigned int x, slot = 0;
1384         unsigned int found = 0;
1385         unsigned int hash;
1386         unsigned int bm_size;
1387         u64 dblock;
1388         u32 extlen = 0;
1389         int error;
1390
1391         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1392                 return -EIO;
1393
1394         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1395         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1396         bm_size *= sizeof(unsigned long);
1397         error = -ENOMEM;
1398         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1399         if (sdp->sd_quota_bitmap == NULL)
1400                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1401                                                  __GFP_ZERO);
1402         if (!sdp->sd_quota_bitmap)
1403                 return error;
1404
1405         for (x = 0; x < blocks; x++) {
1406                 struct buffer_head *bh;
1407                 const struct gfs2_quota_change *qc;
1408                 unsigned int y;
1409
1410                 if (!extlen) {
1411                         extlen = 32;
1412                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1413                         if (error)
1414                                 goto fail;
1415                 }
1416                 error = -EIO;
1417                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1418                 if (!bh)
1419                         goto fail;
1420                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1421                         brelse(bh);
1422                         goto fail;
1423                 }
1424
1425                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1426                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1427                      y++, slot++) {
1428                         struct gfs2_quota_data *qd;
1429                         s64 qc_change = be64_to_cpu(qc->qc_change);
1430                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1431                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1432                                                 USRQUOTA : GRPQUOTA;
1433                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1434                                                       be32_to_cpu(qc->qc_id));
1435                         qc++;
1436                         if (!qc_change)
1437                                 continue;
1438
1439                         hash = gfs2_qd_hash(sdp, qc_id);
1440                         qd = qd_alloc(hash, sdp, qc_id);
1441                         if (qd == NULL) {
1442                                 brelse(bh);
1443                                 goto fail;
1444                         }
1445
1446                         set_bit(QDF_CHANGE, &qd->qd_flags);
1447                         qd->qd_change = qc_change;
1448                         qd->qd_slot = slot;
1449                         qd->qd_slot_count = 1;
1450
1451                         spin_lock(&qd_lock);
1452                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1453                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1454                         atomic_inc(&sdp->sd_quota_count);
1455                         spin_unlock(&qd_lock);
1456
1457                         spin_lock_bucket(hash);
1458                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1459                         spin_unlock_bucket(hash);
1460
1461                         found++;
1462                 }
1463
1464                 brelse(bh);
1465                 dblock++;
1466                 extlen--;
1467         }
1468
1469         if (found)
1470                 fs_info(sdp, "found %u quota changes\n", found);
1471
1472         return 0;
1473
1474 fail:
1475         gfs2_quota_cleanup(sdp);
1476         return error;
1477 }
1478
1479 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1480 {
1481         struct gfs2_quota_data *qd;
1482         LIST_HEAD(dispose);
1483         int count;
1484
1485         BUG_ON(test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1486
1487         spin_lock(&qd_lock);
1488         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1489                 spin_lock(&qd->qd_lockref.lock);
1490                 if (qd->qd_lockref.count != 0) {
1491                         spin_unlock(&qd->qd_lockref.lock);
1492                         continue;
1493                 }
1494                 lockref_mark_dead(&qd->qd_lockref);
1495                 spin_unlock(&qd->qd_lockref.lock);
1496
1497                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1498                 list_add(&qd->qd_lru, &dispose);
1499         }
1500         spin_unlock(&qd_lock);
1501
1502         gfs2_qd_list_dispose(&dispose);
1503
1504         wait_event_timeout(sdp->sd_kill_wait,
1505                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1506                 HZ * 60);
1507
1508         if (count != 0)
1509                 fs_err(sdp, "%d left-over quota data objects\n", count);
1510
1511         kvfree(sdp->sd_quota_bitmap);
1512         sdp->sd_quota_bitmap = NULL;
1513 }
1514
1515 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1516 {
1517         if (error == 0 || error == -EROFS)
1518                 return;
1519         if (!gfs2_withdrawn(sdp)) {
1520                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1521                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1522                 wake_up(&sdp->sd_logd_waitq);
1523         }
1524 }
1525
1526 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1527                                int (*fxn)(struct super_block *sb, int type),
1528                                unsigned long t, unsigned long *timeo,
1529                                unsigned int *new_timeo)
1530 {
1531         if (t >= *timeo) {
1532                 int error = fxn(sdp->sd_vfs, 0);
1533                 quotad_error(sdp, msg, error);
1534                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1535         } else {
1536                 *timeo -= t;
1537         }
1538 }
1539
1540 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1541         if (!sdp->sd_statfs_force_sync) {
1542                 sdp->sd_statfs_force_sync = 1;
1543                 wake_up(&sdp->sd_quota_wait);
1544         }
1545 }
1546
1547
1548 /**
1549  * gfs2_quotad - Write cached quota changes into the quota file
1550  * @data: Pointer to GFS2 superblock
1551  *
1552  */
1553
1554 int gfs2_quotad(void *data)
1555 {
1556         struct gfs2_sbd *sdp = data;
1557         struct gfs2_tune *tune = &sdp->sd_tune;
1558         unsigned long statfs_timeo = 0;
1559         unsigned long quotad_timeo = 0;
1560         unsigned long t = 0;
1561
1562         while (!kthread_should_stop()) {
1563                 if (gfs2_withdrawn(sdp))
1564                         break;
1565
1566                 /* Update the master statfs file */
1567                 if (sdp->sd_statfs_force_sync) {
1568                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1569                         quotad_error(sdp, "statfs", error);
1570                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1571                 }
1572                 else
1573                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1574                                            &statfs_timeo,
1575                                            &tune->gt_statfs_quantum);
1576
1577                 /* Update quota file */
1578                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1579                                    &quotad_timeo, &tune->gt_quota_quantum);
1580
1581                 try_to_freeze();
1582
1583                 t = min(quotad_timeo, statfs_timeo);
1584
1585                 t = wait_event_interruptible_timeout(sdp->sd_quota_wait,
1586                                 sdp->sd_statfs_force_sync ||
1587                                 gfs2_withdrawn(sdp) ||
1588                                 kthread_should_stop(),
1589                                 t);
1590
1591                 if (sdp->sd_statfs_force_sync)
1592                         t = 0;
1593         }
1594
1595         return 0;
1596 }
1597
1598 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1599 {
1600         struct gfs2_sbd *sdp = sb->s_fs_info;
1601
1602         memset(state, 0, sizeof(*state));
1603
1604         switch (sdp->sd_args.ar_quota) {
1605         case GFS2_QUOTA_QUIET:
1606                 fallthrough;
1607         case GFS2_QUOTA_ON:
1608                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1609                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1610                 fallthrough;
1611         case GFS2_QUOTA_ACCOUNT:
1612                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1613                                                   QCI_SYSFILE;
1614                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1615                                                   QCI_SYSFILE;
1616                 break;
1617         case GFS2_QUOTA_OFF:
1618                 break;
1619         }
1620         if (sdp->sd_quota_inode) {
1621                 state->s_state[USRQUOTA].ino =
1622                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1623                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1624         }
1625         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1626         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1627         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1628         return 0;
1629 }
1630
1631 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1632                           struct qc_dqblk *fdq)
1633 {
1634         struct gfs2_sbd *sdp = sb->s_fs_info;
1635         struct gfs2_quota_lvb *qlvb;
1636         struct gfs2_quota_data *qd;
1637         struct gfs2_holder q_gh;
1638         int error;
1639
1640         memset(fdq, 0, sizeof(*fdq));
1641
1642         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1643                 return -ESRCH; /* Crazy XFS error code */
1644
1645         if ((qid.type != USRQUOTA) &&
1646             (qid.type != GRPQUOTA))
1647                 return -EINVAL;
1648
1649         error = qd_get(sdp, qid, &qd);
1650         if (error)
1651                 return error;
1652         error = do_glock(qd, FORCE, &q_gh);
1653         if (error)
1654                 goto out;
1655
1656         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1657         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1658         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1659         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1660
1661         gfs2_glock_dq_uninit(&q_gh);
1662 out:
1663         qd_put(qd);
1664         return error;
1665 }
1666
1667 /* GFS2 only supports a subset of the XFS fields */
1668 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1669
1670 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1671                           struct qc_dqblk *fdq)
1672 {
1673         struct gfs2_sbd *sdp = sb->s_fs_info;
1674         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1675         struct gfs2_quota_data *qd;
1676         struct gfs2_holder q_gh, i_gh;
1677         unsigned int data_blocks, ind_blocks;
1678         unsigned int blocks = 0;
1679         int alloc_required;
1680         loff_t offset;
1681         int error;
1682
1683         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1684                 return -ESRCH; /* Crazy XFS error code */
1685
1686         if ((qid.type != USRQUOTA) &&
1687             (qid.type != GRPQUOTA))
1688                 return -EINVAL;
1689
1690         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1691                 return -EINVAL;
1692
1693         error = qd_get(sdp, qid, &qd);
1694         if (error)
1695                 return error;
1696
1697         error = gfs2_qa_get(ip);
1698         if (error)
1699                 goto out_put;
1700
1701         inode_lock(&ip->i_inode);
1702         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1703         if (error)
1704                 goto out_unlockput;
1705         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1706         if (error)
1707                 goto out_q;
1708
1709         /* Check for existing entry, if none then alloc new blocks */
1710         error = update_qd(sdp, qd);
1711         if (error)
1712                 goto out_i;
1713
1714         /* If nothing has changed, this is a no-op */
1715         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1716             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1717                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1718
1719         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1720             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1721                 fdq->d_fieldmask ^= QC_SPC_HARD;
1722
1723         if ((fdq->d_fieldmask & QC_SPACE) &&
1724             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1725                 fdq->d_fieldmask ^= QC_SPACE;
1726
1727         if (fdq->d_fieldmask == 0)
1728                 goto out_i;
1729
1730         offset = qd2offset(qd);
1731         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1732         if (gfs2_is_stuffed(ip))
1733                 alloc_required = 1;
1734         if (alloc_required) {
1735                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1736                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1737                                        &data_blocks, &ind_blocks);
1738                 blocks = 1 + data_blocks + ind_blocks;
1739                 ap.target = blocks;
1740                 error = gfs2_inplace_reserve(ip, &ap);
1741                 if (error)
1742                         goto out_i;
1743                 blocks += gfs2_rg_blocks(ip, blocks);
1744         }
1745
1746         /* Some quotas span block boundaries and can update two blocks,
1747            adding an extra block to the transaction to handle such quotas */
1748         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1749         if (error)
1750                 goto out_release;
1751
1752         /* Apply changes */
1753         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1754         if (!error)
1755                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1756
1757         gfs2_trans_end(sdp);
1758 out_release:
1759         if (alloc_required)
1760                 gfs2_inplace_release(ip);
1761 out_i:
1762         gfs2_glock_dq_uninit(&i_gh);
1763 out_q:
1764         gfs2_glock_dq_uninit(&q_gh);
1765 out_unlockput:
1766         gfs2_qa_put(ip);
1767         inode_unlock(&ip->i_inode);
1768 out_put:
1769         qd_put(qd);
1770         return error;
1771 }
1772
1773 const struct quotactl_ops gfs2_quotactl_ops = {
1774         .quota_sync     = gfs2_quota_sync,
1775         .get_state      = gfs2_quota_get_state,
1776         .get_dqblk      = gfs2_get_dqblk,
1777         .set_dqblk      = gfs2_set_dqblk,
1778 };
1779
1780 void __init gfs2_quota_hash_init(void)
1781 {
1782         unsigned i;
1783
1784         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1785                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1786 }