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         kmem_cache_free(gfs2_quotad_cachep, qd);
 113 }
 114
 115 static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
 116 {
 117         struct gfs2_sbd *sdp = qd->qd_sbd;
 118
 119         spin_lock(&qd_lock);
 120         list_del(&qd->qd_list);
 121         spin_unlock(&qd_lock);
 122
 123         spin_lock_bucket(qd->qd_hash);
 124         hlist_bl_del_rcu(&qd->qd_hlist);
 125         spin_unlock_bucket(qd->qd_hash);
 126
 127         if (!gfs2_withdrawn(sdp)) {
 128                 gfs2_assert_warn(sdp, !qd->qd_change);
 129                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 130                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 131         }
 132
 133         gfs2_glock_put(qd->qd_gl);
 134         call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 135 }
 136
 137 static void gfs2_qd_list_dispose(struct list_head *list)
 138 {
 139         struct gfs2_quota_data *qd;
 140
 141         while (!list_empty(list)) {
 142                 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
 143                 list_del(&qd->qd_lru);
 144
 145                 gfs2_qd_dispose(qd);
 146                 atomic_dec(&sdp->sd_quota_count);
 147         }
 148 }
 149
 150
 151 static enum lru_status gfs2_qd_isolate(struct list_head *item,
 152                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
 153 {
 154         struct list_head *dispose = arg;
 155         struct gfs2_quota_data *qd =
 156                 list_entry(item, struct gfs2_quota_data, qd_lru);
 157         enum lru_status status;
 158
 159         if (!spin_trylock(&qd->qd_lockref.lock))
 160                 return LRU_SKIP;
 161
 162         status = LRU_SKIP;
 163         if (qd->qd_lockref.count == 0) {
 164                 lockref_mark_dead(&qd->qd_lockref);
 165                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
 166                 status = LRU_REMOVED;
 167         }
 168
 169         spin_unlock(&qd->qd_lockref.lock);
 170         return status;
 171 }
 172
 173 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 174                                          struct shrink_control *sc)
 175 {
 176         LIST_HEAD(dispose);
 177         unsigned long freed;
 178
 179         if (!(sc->gfp_mask & __GFP_FS))
 180                 return SHRINK_STOP;
 181
 182         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 183                                      gfs2_qd_isolate, &dispose);
 184
 185         gfs2_qd_list_dispose(&dispose);
 186
 187         return freed;
 188 }
 189
 190 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 191                                           struct shrink_control *sc)
 192 {
 193         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 194 }
 195
 196 struct shrinker gfs2_qd_shrinker = {
 197         .count_objects = gfs2_qd_shrink_count,
 198         .scan_objects = gfs2_qd_shrink_scan,
 199         .seeks = DEFAULT_SEEKS,
 200         .flags = SHRINKER_NUMA_AWARE,
 201 };
 202
 203
 204 static u64 qd2index(struct gfs2_quota_data *qd)
 205 {
 206         struct kqid qid = qd->qd_id;
 207         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 208                 ((qid.type == USRQUOTA) ? 0 : 1);
 209 }
 210
 211 static u64 qd2offset(struct gfs2_quota_data *qd)
 212 {
 213         u64 offset;
 214
 215         offset = qd2index(qd);
 216         offset *= sizeof(struct gfs2_quota);
 217
 218         return offset;
 219 }
 220
 221 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 222 {
 223         struct gfs2_quota_data *qd;
 224         int error;
 225
 226         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 227         if (!qd)
 228                 return NULL;
 229
 230         qd->qd_sbd = sdp;
 231         qd->qd_lockref.count = 0;
 232         spin_lock_init(&qd->qd_lockref.lock);
 233         qd->qd_id = qid;
 234         qd->qd_slot = -1;
 235         INIT_LIST_HEAD(&qd->qd_lru);
 236         qd->qd_hash = hash;
 237
 238         error = gfs2_glock_get(sdp, qd2index(qd),
 239                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 240         if (error)
 241                 goto fail;
 242
 243         return qd;
 244
 245 fail:
 246         kmem_cache_free(gfs2_quotad_cachep, qd);
 247         return NULL;
 248 }
 249
 250 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 251                                                      const struct gfs2_sbd *sdp,
 252                                                      struct kqid qid)
 253 {
 254         struct gfs2_quota_data *qd;
 255         struct hlist_bl_node *h;
 256
 257         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 258                 if (!qid_eq(qd->qd_id, qid))
 259                         continue;
 260                 if (qd->qd_sbd != sdp)
 261                         continue;
 262                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 263                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 264                         return qd;
 265                 }
 266         }
 267
 268         return NULL;
 269 }
 270
 271
 272 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 273                   struct gfs2_quota_data **qdp)
 274 {
 275         struct gfs2_quota_data *qd, *new_qd;
 276         unsigned int hash = gfs2_qd_hash(sdp, qid);
 277
 278         rcu_read_lock();
 279         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 280         rcu_read_unlock();
 281
 282         if (qd)
 283                 return 0;
 284
 285         new_qd = qd_alloc(hash, sdp, qid);
 286         if (!new_qd)
 287                 return -ENOMEM;
 288
 289         spin_lock(&qd_lock);
 290         spin_lock_bucket(hash);
 291         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 292         if (qd == NULL) {
 293                 new_qd->qd_lockref.count++;
 294                 *qdp = new_qd;
 295                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 296                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 297                 atomic_inc(&sdp->sd_quota_count);
 298         }
 299         spin_unlock_bucket(hash);
 300         spin_unlock(&qd_lock);
 301
 302         if (qd) {
 303                 gfs2_glock_put(new_qd->qd_gl);
 304                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 305         }
 306
 307         return 0;
 308 }
 309
 310
 311 static void qd_hold(struct gfs2_quota_data *qd)
 312 {
 313         struct gfs2_sbd *sdp = qd->qd_sbd;
 314         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 315         lockref_get(&qd->qd_lockref);
 316 }
 317
 318 static void qd_put(struct gfs2_quota_data *qd)
 319 {
 320         if (lockref_put_or_lock(&qd->qd_lockref))
 321                 return;
 322
 323         qd->qd_lockref.count = 0;
 324         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 325         spin_unlock(&qd->qd_lockref.lock);
 326
 327 }
 328
 329 static int slot_get(struct gfs2_quota_data *qd)
 330 {
 331         struct gfs2_sbd *sdp = qd->qd_sbd;
 332         unsigned int bit;
 333         int error = 0;
 334
 335         spin_lock(&sdp->sd_bitmap_lock);
 336         if (qd->qd_slot_count != 0)
 337                 goto out;
 338
 339         error = -ENOSPC;
 340         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
 341         if (bit < sdp->sd_quota_slots) {
 342                 set_bit(bit, sdp->sd_quota_bitmap);
 343                 qd->qd_slot = bit;
 344                 error = 0;
 345 out:
 346                 qd->qd_slot_count++;
 347         }
 348         spin_unlock(&sdp->sd_bitmap_lock);
 349
 350         return error;
 351 }
 352
 353 static void slot_hold(struct gfs2_quota_data *qd)
 354 {
 355         struct gfs2_sbd *sdp = qd->qd_sbd;
 356
 357         spin_lock(&sdp->sd_bitmap_lock);
 358         gfs2_assert(sdp, qd->qd_slot_count);
 359         qd->qd_slot_count++;
 360         spin_unlock(&sdp->sd_bitmap_lock);
 361 }
 362
 363 static void slot_put(struct gfs2_quota_data *qd)
 364 {
 365         struct gfs2_sbd *sdp = qd->qd_sbd;
 366
 367         spin_lock(&sdp->sd_bitmap_lock);
 368         gfs2_assert(sdp, qd->qd_slot_count);
 369         if (!--qd->qd_slot_count) {
 370                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 371                 qd->qd_slot = -1;
 372         }
 373         spin_unlock(&sdp->sd_bitmap_lock);
 374 }
 375
 376 static int bh_get(struct gfs2_quota_data *qd)
 377 {
 378         struct gfs2_sbd *sdp = qd->qd_sbd;
 379         struct inode *inode = sdp->sd_qc_inode;
 380         struct gfs2_inode *ip = GFS2_I(inode);
 381         unsigned int block, offset;
 382         struct buffer_head *bh;
 383         struct iomap iomap = { };
 384         int error;
 385
 386         mutex_lock(&sdp->sd_quota_mutex);
 387
 388         if (qd->qd_bh_count++) {
 389                 mutex_unlock(&sdp->sd_quota_mutex);
 390                 return 0;
 391         }
 392
 393         block = qd->qd_slot / sdp->sd_qc_per_block;
 394         offset = qd->qd_slot % sdp->sd_qc_per_block;
 395
 396         error = gfs2_iomap_get(inode,
 397                                (loff_t)block << inode->i_blkbits,
 398                                i_blocksize(inode), &iomap);
 399         if (error)
 400                 goto fail;
 401         error = -ENOENT;
 402         if (iomap.type != IOMAP_MAPPED)
 403                 goto fail;
 404
 405         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
 406                                DIO_WAIT, 0, &bh);
 407         if (error)
 408                 goto fail;
 409         error = -EIO;
 410         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 411                 goto fail_brelse;
 412
 413         qd->qd_bh = bh;
 414         qd->qd_bh_qc = (struct gfs2_quota_change *)
 415                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 416                  offset * sizeof(struct gfs2_quota_change));
 417
 418         mutex_unlock(&sdp->sd_quota_mutex);
 419
 420         return 0;
 421
 422 fail_brelse:
 423         brelse(bh);
 424 fail:
 425         qd->qd_bh_count--;
 426         mutex_unlock(&sdp->sd_quota_mutex);
 427         return error;
 428 }
 429
 430 static void bh_put(struct gfs2_quota_data *qd)
 431 {
 432         struct gfs2_sbd *sdp = qd->qd_sbd;
 433
 434         mutex_lock(&sdp->sd_quota_mutex);
 435         gfs2_assert(sdp, qd->qd_bh_count);
 436         if (!--qd->qd_bh_count) {
 437                 brelse(qd->qd_bh);
 438                 qd->qd_bh = NULL;
 439                 qd->qd_bh_qc = NULL;
 440         }
 441         mutex_unlock(&sdp->sd_quota_mutex);
 442 }
 443
 444 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 445                          u64 *sync_gen)
 446 {
 447         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 448             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 449             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 450                 return 0;
 451
 452         if (!lockref_get_not_dead(&qd->qd_lockref))
 453                 return 0;
 454
 455         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 456         set_bit(QDF_LOCKED, &qd->qd_flags);
 457         qd->qd_change_sync = qd->qd_change;
 458         slot_hold(qd);
 459         return 1;
 460 }
 461
 462 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 463 {
 464         struct gfs2_quota_data *qd = NULL, *iter;
 465         int error;
 466
 467         *qdp = NULL;
 468
 469         if (sb_rdonly(sdp->sd_vfs))
 470                 return 0;
 471
 472         spin_lock(&qd_lock);
 473
 474         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 475                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 476                         qd = iter;
 477                         break;
 478                 }
 479         }
 480
 481         spin_unlock(&qd_lock);
 482
 483         if (qd) {
 484                 error = bh_get(qd);
 485                 if (error) {
 486                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 487                         slot_put(qd);
 488                         qd_put(qd);
 489                         return error;
 490                 }
 491         }
 492
 493         *qdp = qd;
 494
 495         return 0;
 496 }
 497
 498 static void qd_unlock(struct gfs2_quota_data *qd)
 499 {
 500         gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
 501         clear_bit(QDF_LOCKED, &qd->qd_flags);
 502         bh_put(qd);
 503         slot_put(qd);
 504         qd_put(qd);
 505 }
 506
 507 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 508                     struct gfs2_quota_data **qdp)
 509 {
 510         int error;
 511
 512         error = qd_get(sdp, qid, qdp);
 513         if (error)
 514                 return error;
 515
 516         error = slot_get(*qdp);
 517         if (error)
 518                 goto fail;
 519
 520         error = bh_get(*qdp);
 521         if (error)
 522                 goto fail_slot;
 523
 524         return 0;
 525
 526 fail_slot:
 527         slot_put(*qdp);
 528 fail:
 529         qd_put(*qdp);
 530         return error;
 531 }
 532
 533 static void qdsb_put(struct gfs2_quota_data *qd)
 534 {
 535         bh_put(qd);
 536         slot_put(qd);
 537         qd_put(qd);
 538 }
 539
 540 /**
 541  * gfs2_qa_get - make sure we have a quota allocations data structure,
 542  *               if necessary
 543  * @ip: the inode for this reservation
 544  */
 545 int gfs2_qa_get(struct gfs2_inode *ip)
 546 {
 547         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 548         struct inode *inode = &ip->i_inode;
 549
 550         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 551                 return 0;
 552
 553         spin_lock(&inode->i_lock);
 554         if (ip->i_qadata == NULL) {
 555                 struct gfs2_qadata *tmp;
 556
 557                 spin_unlock(&inode->i_lock);
 558                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 559                 if (!tmp)
 560                         return -ENOMEM;
 561
 562                 spin_lock(&inode->i_lock);
 563                 if (ip->i_qadata == NULL)
 564                         ip->i_qadata = tmp;
 565                 else
 566                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 567         }
 568         ip->i_qadata->qa_ref++;
 569         spin_unlock(&inode->i_lock);
 570         return 0;
 571 }
 572
 573 void gfs2_qa_put(struct gfs2_inode *ip)
 574 {
 575         struct inode *inode = &ip->i_inode;
 576
 577         spin_lock(&inode->i_lock);
 578         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 579                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 580                 ip->i_qadata = NULL;
 581         }
 582         spin_unlock(&inode->i_lock);
 583 }
 584
 585 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 586 {
 587         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 588         struct gfs2_quota_data **qd;
 589         int error;
 590
 591         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 592                 return 0;
 593
 594         error = gfs2_qa_get(ip);
 595         if (error)
 596                 return error;
 597
 598         qd = ip->i_qadata->qa_qd;
 599
 600         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 601             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 602                 error = -EIO;
 603                 gfs2_qa_put(ip);
 604                 goto out;
 605         }
 606
 607         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 608         if (error)
 609                 goto out_unhold;
 610         ip->i_qadata->qa_qd_num++;
 611         qd++;
 612
 613         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 614         if (error)
 615                 goto out_unhold;
 616         ip->i_qadata->qa_qd_num++;
 617         qd++;
 618
 619         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 620             !uid_eq(uid, ip->i_inode.i_uid)) {
 621                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 622                 if (error)
 623                         goto out_unhold;
 624                 ip->i_qadata->qa_qd_num++;
 625                 qd++;
 626         }
 627
 628         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 629             !gid_eq(gid, ip->i_inode.i_gid)) {
 630                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 631                 if (error)
 632                         goto out_unhold;
 633                 ip->i_qadata->qa_qd_num++;
 634                 qd++;
 635         }
 636
 637 out_unhold:
 638         if (error)
 639                 gfs2_quota_unhold(ip);
 640 out:
 641         return error;
 642 }
 643
 644 void gfs2_quota_unhold(struct gfs2_inode *ip)
 645 {
 646         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 647         u32 x;
 648
 649         if (ip->i_qadata == NULL)
 650                 return;
 651
 652         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 653
 654         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 655                 qdsb_put(ip->i_qadata->qa_qd[x]);
 656                 ip->i_qadata->qa_qd[x] = NULL;
 657         }
 658         ip->i_qadata->qa_qd_num = 0;
 659         gfs2_qa_put(ip);
 660 }
 661
 662 static int sort_qd(const void *a, const void *b)
 663 {
 664         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 665         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 666
 667         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 668                 return -1;
 669         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 670                 return 1;
 671         return 0;
 672 }
 673
 674 static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 675 {
 676         struct gfs2_sbd *sdp = qd->qd_sbd;
 677         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 678         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 679         s64 x;
 680
 681         mutex_lock(&sdp->sd_quota_mutex);
 682         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 683
 684         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 685                 qc->qc_change = 0;
 686                 qc->qc_flags = 0;
 687                 if (qd->qd_id.type == USRQUOTA)
 688                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 689                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 690         }
 691
 692         x = be64_to_cpu(qc->qc_change) + change;
 693         qc->qc_change = cpu_to_be64(x);
 694
 695         spin_lock(&qd_lock);
 696         qd->qd_change = x;
 697         spin_unlock(&qd_lock);
 698
 699         if (qc_type == QC_CHANGE) {
 700                 if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 701                         qd_hold(qd);
 702                         slot_hold(qd);
 703                 }
 704         } else {
 705                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 706                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 707                 qc->qc_flags = 0;
 708                 qc->qc_id = 0;
 709                 slot_put(qd);
 710                 qd_put(qd);
 711         }
 712
 713         if (change < 0) /* Reset quiet flag if we freed some blocks */
 714                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 715         mutex_unlock(&sdp->sd_quota_mutex);
 716 }
 717
 718 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 719                                   unsigned off, void *buf, unsigned bytes)
 720 {
 721         struct inode *inode = &ip->i_inode;
 722         struct gfs2_sbd *sdp = GFS2_SB(inode);
 723         struct address_space *mapping = inode->i_mapping;
 724         struct page *page;
 725         struct buffer_head *bh;
 726         u64 blk;
 727         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 728         unsigned to_write = bytes, pg_off = off;
 729         int done = 0;
 730
 731         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 732         boff = off % bsize;
 733
 734         page = grab_cache_page(mapping, index);
 735         if (!page)
 736                 return -ENOMEM;
 737         if (!page_has_buffers(page))
 738                 create_empty_buffers(page, bsize, 0);
 739
 740         bh = page_buffers(page);
 741         while (!done) {
 742                 /* Find the beginning block within the page */
 743                 if (pg_off >= ((bnum * bsize) + bsize)) {
 744                         bh = bh->b_this_page;
 745                         bnum++;
 746                         blk++;
 747                         continue;
 748                 }
 749                 if (!buffer_mapped(bh)) {
 750                         gfs2_block_map(inode, blk, bh, 1);
 751                         if (!buffer_mapped(bh))
 752                                 goto unlock_out;
 753                         /* If it's a newly allocated disk block, zero it */
 754                         if (buffer_new(bh))
 755                                 zero_user(page, bnum * bsize, bh->b_size);
 756                 }
 757                 if (PageUptodate(page))
 758                         set_buffer_uptodate(bh);
 759                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 760                         goto unlock_out;
 761                 if (gfs2_is_jdata(ip))
 762                         gfs2_trans_add_data(ip->i_gl, bh);
 763                 else
 764                         gfs2_ordered_add_inode(ip);
 765
 766                 /* If we need to write to the next block as well */
 767                 if (to_write > (bsize - boff)) {
 768                         pg_off += (bsize - boff);
 769                         to_write -= (bsize - boff);
 770                         boff = pg_off % bsize;
 771                         continue;
 772                 }
 773                 done = 1;
 774         }
 775
 776         /* Write to the page, now that we have setup the buffer(s) */
 777         memcpy_to_page(page, off, buf, bytes);
 778         flush_dcache_page(page);
 779         unlock_page(page);
 780         put_page(page);
 781
 782         return 0;
 783
 784 unlock_out:
 785         unlock_page(page);
 786         put_page(page);
 787         return -EIO;
 788 }
 789
 790 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
 791                                  loff_t loc)
 792 {
 793         unsigned long pg_beg;
 794         unsigned pg_off, nbytes, overflow = 0;
 795         int pg_oflow = 0, error;
 796         void *ptr;
 797
 798         nbytes = sizeof(struct gfs2_quota);
 799
 800         pg_beg = loc >> PAGE_SHIFT;
 801         pg_off = offset_in_page(loc);
 802
 803         /* If the quota straddles a page boundary, split the write in two */
 804         if ((pg_off + nbytes) > PAGE_SIZE) {
 805                 pg_oflow = 1;
 806                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 807         }
 808
 809         ptr = qp;
 810         error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
 811                                        nbytes - overflow);
 812         /* If there's an overflow, write the remaining bytes to the next page */
 813         if (!error && pg_oflow)
 814                 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
 815                                                ptr + nbytes - overflow,
 816                                                overflow);
 817         return error;
 818 }
 819
 820 /**
 821  * gfs2_adjust_quota - adjust record of current block usage
 822  * @ip: The quota inode
 823  * @loc: Offset of the entry in the quota file
 824  * @change: The amount of usage change to record
 825  * @qd: The quota data
 826  * @fdq: The updated limits to record
 827  *
 828  * This function was mostly borrowed from gfs2_block_truncate_page which was
 829  * in turn mostly borrowed from ext3
 830  *
 831  * Returns: 0 or -ve on error
 832  */
 833
 834 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 835                              s64 change, struct gfs2_quota_data *qd,
 836                              struct qc_dqblk *fdq)
 837 {
 838         struct inode *inode = &ip->i_inode;
 839         struct gfs2_sbd *sdp = GFS2_SB(inode);
 840         struct gfs2_quota q;
 841         int err;
 842         u64 size;
 843
 844         if (gfs2_is_stuffed(ip)) {
 845                 err = gfs2_unstuff_dinode(ip);
 846                 if (err)
 847                         return err;
 848         }
 849
 850         memset(&q, 0, sizeof(struct gfs2_quota));
 851         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 852         if (err < 0)
 853                 return err;
 854
 855         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 856         err = -EIO;
 857         be64_add_cpu(&q.qu_value, change);
 858         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 859                 q.qu_value = 0; /* Never go negative on quota usage */
 860         qd->qd_qb.qb_value = q.qu_value;
 861         if (fdq) {
 862                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 863                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 864                         qd->qd_qb.qb_warn = q.qu_warn;
 865                 }
 866                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 867                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 868                         qd->qd_qb.qb_limit = q.qu_limit;
 869                 }
 870                 if (fdq->d_fieldmask & QC_SPACE) {
 871                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 872                         qd->qd_qb.qb_value = q.qu_value;
 873                 }
 874         }
 875
 876         err = gfs2_write_disk_quota(ip, &q, loc);
 877         if (!err) {
 878                 size = loc + sizeof(struct gfs2_quota);
 879                 if (size > inode->i_size)
 880                         i_size_write(inode, size);
 881                 inode->i_mtime = inode->i_atime = current_time(inode);
 882                 mark_inode_dirty(inode);
 883                 set_bit(QDF_REFRESH, &qd->qd_flags);
 884         }
 885
 886         return err;
 887 }
 888
 889 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 890 {
 891         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 892         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 893         struct gfs2_alloc_parms ap = { .aflags = 0, };
 894         unsigned int data_blocks, ind_blocks;
 895         struct gfs2_holder *ghs, i_gh;
 896         unsigned int qx, x;
 897         struct gfs2_quota_data *qd;
 898         unsigned reserved;
 899         loff_t offset;
 900         unsigned int nalloc = 0, blocks;
 901         int error;
 902
 903         error = gfs2_qa_get(ip);
 904         if (error)
 905                 return error;
 906
 907         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 908                               &data_blocks, &ind_blocks);
 909
 910         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 911         if (!ghs) {
 912                 error = -ENOMEM;
 913                 goto out;
 914         }
 915
 916         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 917         inode_lock(&ip->i_inode);
 918         for (qx = 0; qx < num_qd; qx++) {
 919                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 920                                            GL_NOCACHE, &ghs[qx]);
 921                 if (error)
 922                         goto out_dq;
 923         }
 924
 925         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 926         if (error)
 927                 goto out_dq;
 928
 929         for (x = 0; x < num_qd; x++) {
 930                 offset = qd2offset(qda[x]);
 931                 if (gfs2_write_alloc_required(ip, offset,
 932                                               sizeof(struct gfs2_quota)))
 933                         nalloc++;
 934         }
 935
 936         /*
 937          * 1 blk for unstuffing inode if stuffed. We add this extra
 938          * block to the reservation unconditionally. If the inode
 939          * doesn't need unstuffing, the block will be released to the
 940          * rgrp since it won't be allocated during the transaction
 941          */
 942         /* +3 in the end for unstuffing block, inode size update block
 943          * and another block in case quota straddles page boundary and
 944          * two blocks need to be updated instead of 1 */
 945         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 946
 947         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 948         ap.target = reserved;
 949         error = gfs2_inplace_reserve(ip, &ap);
 950         if (error)
 951                 goto out_alloc;
 952
 953         if (nalloc)
 954                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 955
 956         error = gfs2_trans_begin(sdp, blocks, 0);
 957         if (error)
 958                 goto out_ipres;
 959
 960         for (x = 0; x < num_qd; x++) {
 961                 qd = qda[x];
 962                 offset = qd2offset(qd);
 963                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 964                 if (error)
 965                         goto out_end_trans;
 966
 967                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 968                 set_bit(QDF_REFRESH, &qd->qd_flags);
 969         }
 970
 971         error = 0;
 972
 973 out_end_trans:
 974         gfs2_trans_end(sdp);
 975 out_ipres:
 976         gfs2_inplace_release(ip);
 977 out_alloc:
 978         gfs2_glock_dq_uninit(&i_gh);
 979 out_dq:
 980         while (qx--)
 981                 gfs2_glock_dq_uninit(&ghs[qx]);
 982         inode_unlock(&ip->i_inode);
 983         kfree(ghs);
 984         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 985                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 986 out:
 987         gfs2_qa_put(ip);
 988         return error;
 989 }
 990
 991 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 992 {
 993         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 994         struct gfs2_quota q;
 995         struct gfs2_quota_lvb *qlvb;
 996         loff_t pos;
 997         int error;
 998
 999         memset(&q, 0, sizeof(struct gfs2_quota));
1000         pos = qd2offset(qd);
1001         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1002         if (error < 0)
1003                 return error;
1004
1005         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1006         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1007         qlvb->__pad = 0;
1008         qlvb->qb_limit = q.qu_limit;
1009         qlvb->qb_warn = q.qu_warn;
1010         qlvb->qb_value = q.qu_value;
1011         qd->qd_qb = *qlvb;
1012
1013         return 0;
1014 }
1015
1016 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1017                     struct gfs2_holder *q_gh)
1018 {
1019         struct gfs2_sbd *sdp = qd->qd_sbd;
1020         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1021         struct gfs2_holder i_gh;
1022         int error;
1023
1024         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1025 restart:
1026         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1027         if (error)
1028                 return error;
1029
1030         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1031                 force_refresh = FORCE;
1032
1033         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1034
1035         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1036                 gfs2_glock_dq_uninit(q_gh);
1037                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1038                                            GL_NOCACHE, q_gh);
1039                 if (error)
1040                         return error;
1041
1042                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1043                 if (error)
1044                         goto fail;
1045
1046                 error = update_qd(sdp, qd);
1047                 if (error)
1048                         goto fail_gunlock;
1049
1050                 gfs2_glock_dq_uninit(&i_gh);
1051                 gfs2_glock_dq_uninit(q_gh);
1052                 force_refresh = 0;
1053                 goto restart;
1054         }
1055
1056         return 0;
1057
1058 fail_gunlock:
1059         gfs2_glock_dq_uninit(&i_gh);
1060 fail:
1061         gfs2_glock_dq_uninit(q_gh);
1062         return error;
1063 }
1064
1065 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1066 {
1067         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1068         struct gfs2_quota_data *qd;
1069         u32 x;
1070         int error = 0;
1071
1072         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1073                 return 0;
1074
1075         error = gfs2_quota_hold(ip, uid, gid);
1076         if (error)
1077                 return error;
1078
1079         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1080              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1081
1082         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1083                 qd = ip->i_qadata->qa_qd[x];
1084                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1085                 if (error)
1086                         break;
1087         }
1088
1089         if (!error)
1090                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1091         else {
1092                 while (x--)
1093                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1094                 gfs2_quota_unhold(ip);
1095         }
1096
1097         return error;
1098 }
1099
1100 static int need_sync(struct gfs2_quota_data *qd)
1101 {
1102         struct gfs2_sbd *sdp = qd->qd_sbd;
1103         struct gfs2_tune *gt = &sdp->sd_tune;
1104         s64 value;
1105         unsigned int num, den;
1106         int do_sync = 1;
1107
1108         if (!qd->qd_qb.qb_limit)
1109                 return 0;
1110
1111         spin_lock(&qd_lock);
1112         value = qd->qd_change;
1113         spin_unlock(&qd_lock);
1114
1115         spin_lock(&gt->gt_spin);
1116         num = gt->gt_quota_scale_num;
1117         den = gt->gt_quota_scale_den;
1118         spin_unlock(&gt->gt_spin);
1119
1120         if (value < 0)
1121                 do_sync = 0;
1122         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1123                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1124                 do_sync = 0;
1125         else {
1126                 value *= gfs2_jindex_size(sdp) * num;
1127                 value = div_s64(value, den);
1128                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1129                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1130                         do_sync = 0;
1131         }
1132
1133         return do_sync;
1134 }
1135
1136 void gfs2_quota_unlock(struct gfs2_inode *ip)
1137 {
1138         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1139         struct gfs2_quota_data *qda[4];
1140         unsigned int count = 0;
1141         u32 x;
1142         int found;
1143
1144         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1145                 return;
1146
1147         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1148                 struct gfs2_quota_data *qd;
1149                 int sync;
1150
1151                 qd = ip->i_qadata->qa_qd[x];
1152                 sync = need_sync(qd);
1153
1154                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1155                 if (!sync)
1156                         continue;
1157
1158                 spin_lock(&qd_lock);
1159                 found = qd_check_sync(sdp, qd, NULL);
1160                 spin_unlock(&qd_lock);
1161
1162                 if (!found)
1163                         continue;
1164
1165                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1166                 if (bh_get(qd)) {
1167                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1168                         slot_put(qd);
1169                         qd_put(qd);
1170                         continue;
1171                 }
1172
1173                 qda[count++] = qd;
1174         }
1175
1176         if (count) {
1177                 do_sync(count, qda);
1178                 for (x = 0; x < count; x++)
1179                         qd_unlock(qda[x]);
1180         }
1181
1182         gfs2_quota_unhold(ip);
1183 }
1184
1185 #define MAX_LINE 256
1186
1187 static int print_message(struct gfs2_quota_data *qd, char *type)
1188 {
1189         struct gfs2_sbd *sdp = qd->qd_sbd;
1190
1191         fs_info(sdp, "quota %s for %s %u\n",
1192                 type,
1193                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1194                 from_kqid(&init_user_ns, qd->qd_id));
1195
1196         return 0;
1197 }
1198
1199 /**
1200  * gfs2_quota_check - check if allocating new blocks will exceed quota
1201  * @ip:  The inode for which this check is being performed
1202  * @uid: The uid to check against
1203  * @gid: The gid to check against
1204  * @ap:  The allocation parameters. ap->target contains the requested
1205  *       blocks. ap->min_target, if set, contains the minimum blks
1206  *       requested.
1207  *
1208  * Returns: 0 on success.
1209  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1210  *                  quota must allow at least min_req blks for success and
1211  *                  ap->allowed is set to the number of blocks allowed
1212  *
1213  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1214  *                  of blocks available.
1215  */
1216 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1217                      struct gfs2_alloc_parms *ap)
1218 {
1219         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1220         struct gfs2_quota_data *qd;
1221         s64 value, warn, limit;
1222         u32 x;
1223         int error = 0;
1224
1225         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1226         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1227                 return 0;
1228
1229         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1230                 qd = ip->i_qadata->qa_qd[x];
1231
1232                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1233                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1234                         continue;
1235
1236                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1237                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1238                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1239                 spin_lock(&qd_lock);
1240                 value += qd->qd_change;
1241                 spin_unlock(&qd_lock);
1242
1243                 if (limit > 0 && (limit - value) < ap->allowed)
1244                         ap->allowed = limit - value;
1245                 /* If we can't meet the target */
1246                 if (limit && limit < (value + (s64)ap->target)) {
1247                         /* If no min_target specified or we don't meet
1248                          * min_target, return -EDQUOT */
1249                         if (!ap->min_target || ap->min_target > ap->allowed) {
1250                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1251                                                       &qd->qd_flags)) {
1252                                         print_message(qd, "exceeded");
1253                                         quota_send_warning(qd->qd_id,
1254                                                            sdp->sd_vfs->s_dev,
1255                                                            QUOTA_NL_BHARDWARN);
1256                                 }
1257                                 error = -EDQUOT;
1258                                 break;
1259                         }
1260                 } else if (warn && warn < value &&
1261                            time_after_eq(jiffies, qd->qd_last_warn +
1262                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1263                                          * HZ)) {
1264                         quota_send_warning(qd->qd_id,
1265                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1266                         error = print_message(qd, "warning");
1267                         qd->qd_last_warn = jiffies;
1268                 }
1269         }
1270         return error;
1271 }
1272
1273 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1274                        kuid_t uid, kgid_t gid)
1275 {
1276         struct gfs2_quota_data *qd;
1277         u32 x;
1278         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1279
1280         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1281             gfs2_assert_warn(sdp, change))
1282                 return;
1283         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1284                 return;
1285
1286         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1287                                  ip->i_qadata->qa_ref > 0))
1288                 return;
1289         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1290                 qd = ip->i_qadata->qa_qd[x];
1291
1292                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1293                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1294                         do_qc(qd, change, QC_CHANGE);
1295                 }
1296         }
1297 }
1298
1299 int gfs2_quota_sync(struct super_block *sb, int type)
1300 {
1301         struct gfs2_sbd *sdp = sb->s_fs_info;
1302         struct gfs2_quota_data **qda;
1303         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1304         unsigned int num_qd;
1305         unsigned int x;
1306         int error = 0;
1307
1308         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1309         if (!qda)
1310                 return -ENOMEM;
1311
1312         mutex_lock(&sdp->sd_quota_sync_mutex);
1313         sdp->sd_quota_sync_gen++;
1314
1315         do {
1316                 num_qd = 0;
1317
1318                 for (;;) {
1319                         error = qd_fish(sdp, qda + num_qd);
1320                         if (error || !qda[num_qd])
1321                                 break;
1322                         if (++num_qd == max_qd)
1323                                 break;
1324                 }
1325
1326                 if (num_qd) {
1327                         if (!error)
1328                                 error = do_sync(num_qd, qda);
1329                         if (!error)
1330                                 for (x = 0; x < num_qd; x++)
1331                                         qda[x]->qd_sync_gen =
1332                                                 sdp->sd_quota_sync_gen;
1333
1334                         for (x = 0; x < num_qd; x++)
1335                                 qd_unlock(qda[x]);
1336                 }
1337         } while (!error && num_qd == max_qd);
1338
1339         mutex_unlock(&sdp->sd_quota_sync_mutex);
1340         kfree(qda);
1341
1342         return error;
1343 }
1344
1345 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1346 {
1347         struct gfs2_quota_data *qd;
1348         struct gfs2_holder q_gh;
1349         int error;
1350
1351         error = qd_get(sdp, qid, &qd);
1352         if (error)
1353                 return error;
1354
1355         error = do_glock(qd, FORCE, &q_gh);
1356         if (!error)
1357                 gfs2_glock_dq_uninit(&q_gh);
1358
1359         qd_put(qd);
1360         return error;
1361 }
1362
1363 int gfs2_quota_init(struct gfs2_sbd *sdp)
1364 {
1365         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1366         u64 size = i_size_read(sdp->sd_qc_inode);
1367         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1368         unsigned int x, slot = 0;
1369         unsigned int found = 0;
1370         unsigned int hash;
1371         unsigned int bm_size;
1372         u64 dblock;
1373         u32 extlen = 0;
1374         int error;
1375
1376         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1377                 return -EIO;
1378
1379         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1380         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1381         bm_size *= sizeof(unsigned long);
1382         error = -ENOMEM;
1383         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1384         if (sdp->sd_quota_bitmap == NULL)
1385                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1386                                                  __GFP_ZERO);
1387         if (!sdp->sd_quota_bitmap)
1388                 return error;
1389
1390         for (x = 0; x < blocks; x++) {
1391                 struct buffer_head *bh;
1392                 const struct gfs2_quota_change *qc;
1393                 unsigned int y;
1394
1395                 if (!extlen) {
1396                         extlen = 32;
1397                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1398                         if (error)
1399                                 goto fail;
1400                 }
1401                 error = -EIO;
1402                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1403                 if (!bh)
1404                         goto fail;
1405                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1406                         brelse(bh);
1407                         goto fail;
1408                 }
1409
1410                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1411                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1412                      y++, slot++) {
1413                         struct gfs2_quota_data *qd;
1414                         s64 qc_change = be64_to_cpu(qc->qc_change);
1415                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1416                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1417                                                 USRQUOTA : GRPQUOTA;
1418                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1419                                                       be32_to_cpu(qc->qc_id));
1420                         qc++;
1421                         if (!qc_change)
1422                                 continue;
1423
1424                         hash = gfs2_qd_hash(sdp, qc_id);
1425                         qd = qd_alloc(hash, sdp, qc_id);
1426                         if (qd == NULL) {
1427                                 brelse(bh);
1428                                 goto fail;
1429                         }
1430
1431                         set_bit(QDF_CHANGE, &qd->qd_flags);
1432                         qd->qd_change = qc_change;
1433                         qd->qd_slot = slot;
1434                         qd->qd_slot_count = 1;
1435
1436                         spin_lock(&qd_lock);
1437                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1438                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1439                         atomic_inc(&sdp->sd_quota_count);
1440                         spin_unlock(&qd_lock);
1441
1442                         spin_lock_bucket(hash);
1443                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1444                         spin_unlock_bucket(hash);
1445
1446                         found++;
1447                 }
1448
1449                 brelse(bh);
1450                 dblock++;
1451                 extlen--;
1452         }
1453
1454         if (found)
1455                 fs_info(sdp, "found %u quota changes\n", found);
1456
1457         return 0;
1458
1459 fail:
1460         gfs2_quota_cleanup(sdp);
1461         return error;
1462 }
1463
1464 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1465 {
1466         struct gfs2_quota_data *qd;
1467         LIST_HEAD(dispose);
1468
1469         spin_lock(&qd_lock);
1470         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1471                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1472                 list_add(&qd->qd_lru, &dispose);
1473         }
1474         spin_unlock(&qd_lock);
1475
1476         gfs2_qd_list_dispose(&dispose);
1477         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1478
1479         kvfree(sdp->sd_quota_bitmap);
1480         sdp->sd_quota_bitmap = NULL;
1481 }
1482
1483 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1484 {
1485         if (error == 0 || error == -EROFS)
1486                 return;
1487         if (!gfs2_withdrawn(sdp)) {
1488                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1489                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1490                 wake_up(&sdp->sd_logd_waitq);
1491         }
1492 }
1493
1494 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1495                                int (*fxn)(struct super_block *sb, int type),
1496                                unsigned long t, unsigned long *timeo,
1497                                unsigned int *new_timeo)
1498 {
1499         if (t >= *timeo) {
1500                 int error = fxn(sdp->sd_vfs, 0);
1501                 quotad_error(sdp, msg, error);
1502                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1503         } else {
1504                 *timeo -= t;
1505         }
1506 }
1507
1508 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1509         if (!sdp->sd_statfs_force_sync) {
1510                 sdp->sd_statfs_force_sync = 1;
1511                 wake_up(&sdp->sd_quota_wait);
1512         }
1513 }
1514
1515
1516 /**
1517  * gfs2_quotad - Write cached quota changes into the quota file
1518  * @data: Pointer to GFS2 superblock
1519  *
1520  */
1521
1522 int gfs2_quotad(void *data)
1523 {
1524         struct gfs2_sbd *sdp = data;
1525         struct gfs2_tune *tune = &sdp->sd_tune;
1526         unsigned long statfs_timeo = 0;
1527         unsigned long quotad_timeo = 0;
1528         unsigned long t = 0;
1529         DEFINE_WAIT(wait);
1530
1531         while (!kthread_should_stop()) {
1532
1533                 if (gfs2_withdrawn(sdp))
1534                         goto bypass;
1535                 /* Update the master statfs file */
1536                 if (sdp->sd_statfs_force_sync) {
1537                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1538                         quotad_error(sdp, "statfs", error);
1539                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1540                 }
1541                 else
1542                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1543                                            &statfs_timeo,
1544                                            &tune->gt_statfs_quantum);
1545
1546                 /* Update quota file */
1547                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1548                                    &quotad_timeo, &tune->gt_quota_quantum);
1549
1550                 try_to_freeze();
1551
1552 bypass:
1553                 t = min(quotad_timeo, statfs_timeo);
1554
1555                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1556                 if (!sdp->sd_statfs_force_sync)
1557                         t -= schedule_timeout(t);
1558                 else
1559                         t = 0;
1560                 finish_wait(&sdp->sd_quota_wait, &wait);
1561         }
1562
1563         return 0;
1564 }
1565
1566 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1567 {
1568         struct gfs2_sbd *sdp = sb->s_fs_info;
1569
1570         memset(state, 0, sizeof(*state));
1571
1572         switch (sdp->sd_args.ar_quota) {
1573         case GFS2_QUOTA_ON:
1574                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1575                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1576                 fallthrough;
1577         case GFS2_QUOTA_ACCOUNT:
1578                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1579                                                   QCI_SYSFILE;
1580                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1581                                                   QCI_SYSFILE;
1582                 break;
1583         case GFS2_QUOTA_OFF:
1584                 break;
1585         }
1586         if (sdp->sd_quota_inode) {
1587                 state->s_state[USRQUOTA].ino =
1588                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1589                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1590         }
1591         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1592         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1593         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1594         return 0;
1595 }
1596
1597 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1598                           struct qc_dqblk *fdq)
1599 {
1600         struct gfs2_sbd *sdp = sb->s_fs_info;
1601         struct gfs2_quota_lvb *qlvb;
1602         struct gfs2_quota_data *qd;
1603         struct gfs2_holder q_gh;
1604         int error;
1605
1606         memset(fdq, 0, sizeof(*fdq));
1607
1608         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1609                 return -ESRCH; /* Crazy XFS error code */
1610
1611         if ((qid.type != USRQUOTA) &&
1612             (qid.type != GRPQUOTA))
1613                 return -EINVAL;
1614
1615         error = qd_get(sdp, qid, &qd);
1616         if (error)
1617                 return error;
1618         error = do_glock(qd, FORCE, &q_gh);
1619         if (error)
1620                 goto out;
1621
1622         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1623         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1624         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1625         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1626
1627         gfs2_glock_dq_uninit(&q_gh);
1628 out:
1629         qd_put(qd);
1630         return error;
1631 }
1632
1633 /* GFS2 only supports a subset of the XFS fields */
1634 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1635
1636 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1637                           struct qc_dqblk *fdq)
1638 {
1639         struct gfs2_sbd *sdp = sb->s_fs_info;
1640         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1641         struct gfs2_quota_data *qd;
1642         struct gfs2_holder q_gh, i_gh;
1643         unsigned int data_blocks, ind_blocks;
1644         unsigned int blocks = 0;
1645         int alloc_required;
1646         loff_t offset;
1647         int error;
1648
1649         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1650                 return -ESRCH; /* Crazy XFS error code */
1651
1652         if ((qid.type != USRQUOTA) &&
1653             (qid.type != GRPQUOTA))
1654                 return -EINVAL;
1655
1656         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1657                 return -EINVAL;
1658
1659         error = qd_get(sdp, qid, &qd);
1660         if (error)
1661                 return error;
1662
1663         error = gfs2_qa_get(ip);
1664         if (error)
1665                 goto out_put;
1666
1667         inode_lock(&ip->i_inode);
1668         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1669         if (error)
1670                 goto out_unlockput;
1671         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1672         if (error)
1673                 goto out_q;
1674
1675         /* Check for existing entry, if none then alloc new blocks */
1676         error = update_qd(sdp, qd);
1677         if (error)
1678                 goto out_i;
1679
1680         /* If nothing has changed, this is a no-op */
1681         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1682             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1683                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1684
1685         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1686             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1687                 fdq->d_fieldmask ^= QC_SPC_HARD;
1688
1689         if ((fdq->d_fieldmask & QC_SPACE) &&
1690             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1691                 fdq->d_fieldmask ^= QC_SPACE;
1692
1693         if (fdq->d_fieldmask == 0)
1694                 goto out_i;
1695
1696         offset = qd2offset(qd);
1697         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1698         if (gfs2_is_stuffed(ip))
1699                 alloc_required = 1;
1700         if (alloc_required) {
1701                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1702                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1703                                        &data_blocks, &ind_blocks);
1704                 blocks = 1 + data_blocks + ind_blocks;
1705                 ap.target = blocks;
1706                 error = gfs2_inplace_reserve(ip, &ap);
1707                 if (error)
1708                         goto out_i;
1709                 blocks += gfs2_rg_blocks(ip, blocks);
1710         }
1711
1712         /* Some quotas span block boundaries and can update two blocks,
1713            adding an extra block to the transaction to handle such quotas */
1714         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1715         if (error)
1716                 goto out_release;
1717
1718         /* Apply changes */
1719         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1720         if (!error)
1721                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1722
1723         gfs2_trans_end(sdp);
1724 out_release:
1725         if (alloc_required)
1726                 gfs2_inplace_release(ip);
1727 out_i:
1728         gfs2_glock_dq_uninit(&i_gh);
1729 out_q:
1730         gfs2_glock_dq_uninit(&q_gh);
1731 out_unlockput:
1732         gfs2_qa_put(ip);
1733         inode_unlock(&ip->i_inode);
1734 out_put:
1735         qd_put(qd);
1736         return error;
1737 }
1738
1739 const struct quotactl_ops gfs2_quotactl_ops = {
1740         .quota_sync     = gfs2_quota_sync,
1741         .get_state      = gfs2_quota_get_state,
1742         .get_dqblk      = gfs2_get_dqblk,
1743         .set_dqblk      = gfs2_set_dqblk,
1744 };
1745
1746 void __init gfs2_quota_hash_init(void)
1747 {
1748         unsigned i;
1749
1750         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1751                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1752 }