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_ref);
 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         return qd2index(qd) * sizeof(struct gfs2_quota);
 217 }
 218
 219 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 220 {
 221         struct gfs2_quota_data *qd;
 222         int error;
 223
 224         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 225         if (!qd)
 226                 return NULL;
 227
 228         qd->qd_sbd = sdp;
 229         qd->qd_lockref.count = 0;
 230         spin_lock_init(&qd->qd_lockref.lock);
 231         qd->qd_id = qid;
 232         qd->qd_slot = -1;
 233         INIT_LIST_HEAD(&qd->qd_lru);
 234         qd->qd_hash = hash;
 235
 236         error = gfs2_glock_get(sdp, qd2index(qd),
 237                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 238         if (error)
 239                 goto fail;
 240
 241         return qd;
 242
 243 fail:
 244         kmem_cache_free(gfs2_quotad_cachep, qd);
 245         return NULL;
 246 }
 247
 248 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 249                                                      const struct gfs2_sbd *sdp,
 250                                                      struct kqid qid)
 251 {
 252         struct gfs2_quota_data *qd;
 253         struct hlist_bl_node *h;
 254
 255         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 256                 if (!qid_eq(qd->qd_id, qid))
 257                         continue;
 258                 if (qd->qd_sbd != sdp)
 259                         continue;
 260                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 261                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 262                         return qd;
 263                 }
 264         }
 265
 266         return NULL;
 267 }
 268
 269
 270 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 271                   struct gfs2_quota_data **qdp)
 272 {
 273         struct gfs2_quota_data *qd, *new_qd;
 274         unsigned int hash = gfs2_qd_hash(sdp, qid);
 275
 276         rcu_read_lock();
 277         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 278         rcu_read_unlock();
 279
 280         if (qd)
 281                 return 0;
 282
 283         new_qd = qd_alloc(hash, sdp, qid);
 284         if (!new_qd)
 285                 return -ENOMEM;
 286
 287         spin_lock(&qd_lock);
 288         spin_lock_bucket(hash);
 289         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 290         if (qd == NULL) {
 291                 new_qd->qd_lockref.count++;
 292                 *qdp = new_qd;
 293                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 294                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 295                 atomic_inc(&sdp->sd_quota_count);
 296         }
 297         spin_unlock_bucket(hash);
 298         spin_unlock(&qd_lock);
 299
 300         if (qd) {
 301                 gfs2_glock_put(new_qd->qd_gl);
 302                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 303         }
 304
 305         return 0;
 306 }
 307
 308
 309 static void qd_hold(struct gfs2_quota_data *qd)
 310 {
 311         struct gfs2_sbd *sdp = qd->qd_sbd;
 312         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 313         lockref_get(&qd->qd_lockref);
 314 }
 315
 316 static void qd_put(struct gfs2_quota_data *qd)
 317 {
 318         struct gfs2_sbd *sdp;
 319
 320         if (lockref_put_or_lock(&qd->qd_lockref))
 321                 return;
 322
 323         BUG_ON(__lockref_is_dead(&qd->qd_lockref));
 324         sdp = qd->qd_sbd;
 325         if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
 326                 lockref_mark_dead(&qd->qd_lockref);
 327                 spin_unlock(&qd->qd_lockref.lock);
 328
 329                 gfs2_qd_dispose(qd);
 330                 return;
 331         }
 332
 333         qd->qd_lockref.count = 0;
 334         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 335         spin_unlock(&qd->qd_lockref.lock);
 336 }
 337
 338 static int slot_get(struct gfs2_quota_data *qd)
 339 {
 340         struct gfs2_sbd *sdp = qd->qd_sbd;
 341         unsigned int bit;
 342         int error = 0;
 343
 344         spin_lock(&sdp->sd_bitmap_lock);
 345         if (qd->qd_slot_ref == 0) {
 346                 bit = find_first_zero_bit(sdp->sd_quota_bitmap,
 347                                           sdp->sd_quota_slots);
 348                 if (bit >= sdp->sd_quota_slots) {
 349                         error = -ENOSPC;
 350                         goto out;
 351                 }
 352                 set_bit(bit, sdp->sd_quota_bitmap);
 353                 qd->qd_slot = bit;
 354         }
 355         qd->qd_slot_ref++;
 356 out:
 357         spin_unlock(&sdp->sd_bitmap_lock);
 358         return error;
 359 }
 360
 361 static void slot_hold(struct gfs2_quota_data *qd)
 362 {
 363         struct gfs2_sbd *sdp = qd->qd_sbd;
 364
 365         spin_lock(&sdp->sd_bitmap_lock);
 366         gfs2_assert(sdp, qd->qd_slot_ref);
 367         qd->qd_slot_ref++;
 368         spin_unlock(&sdp->sd_bitmap_lock);
 369 }
 370
 371 static void slot_put(struct gfs2_quota_data *qd)
 372 {
 373         struct gfs2_sbd *sdp = qd->qd_sbd;
 374
 375         spin_lock(&sdp->sd_bitmap_lock);
 376         gfs2_assert(sdp, qd->qd_slot_ref);
 377         if (!--qd->qd_slot_ref) {
 378                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 379                 qd->qd_slot = -1;
 380         }
 381         spin_unlock(&sdp->sd_bitmap_lock);
 382 }
 383
 384 static int bh_get(struct gfs2_quota_data *qd)
 385 {
 386         struct gfs2_sbd *sdp = qd->qd_sbd;
 387         struct inode *inode = sdp->sd_qc_inode;
 388         struct gfs2_inode *ip = GFS2_I(inode);
 389         unsigned int block, offset;
 390         struct buffer_head *bh;
 391         struct iomap iomap = { };
 392         int error;
 393
 394         mutex_lock(&sdp->sd_quota_mutex);
 395
 396         if (qd->qd_bh_count++) {
 397                 mutex_unlock(&sdp->sd_quota_mutex);
 398                 return 0;
 399         }
 400
 401         block = qd->qd_slot / sdp->sd_qc_per_block;
 402         offset = qd->qd_slot % sdp->sd_qc_per_block;
 403
 404         error = gfs2_iomap_get(inode,
 405                                (loff_t)block << inode->i_blkbits,
 406                                i_blocksize(inode), &iomap);
 407         if (error)
 408                 goto fail;
 409         error = -ENOENT;
 410         if (iomap.type != IOMAP_MAPPED)
 411                 goto fail;
 412
 413         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
 414                                DIO_WAIT, 0, &bh);
 415         if (error)
 416                 goto fail;
 417         error = -EIO;
 418         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 419                 goto fail_brelse;
 420
 421         qd->qd_bh = bh;
 422         qd->qd_bh_qc = (struct gfs2_quota_change *)
 423                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 424                  offset * sizeof(struct gfs2_quota_change));
 425
 426         mutex_unlock(&sdp->sd_quota_mutex);
 427
 428         return 0;
 429
 430 fail_brelse:
 431         brelse(bh);
 432 fail:
 433         qd->qd_bh_count--;
 434         mutex_unlock(&sdp->sd_quota_mutex);
 435         return error;
 436 }
 437
 438 static void bh_put(struct gfs2_quota_data *qd)
 439 {
 440         struct gfs2_sbd *sdp = qd->qd_sbd;
 441
 442         mutex_lock(&sdp->sd_quota_mutex);
 443         gfs2_assert(sdp, qd->qd_bh_count);
 444         if (!--qd->qd_bh_count) {
 445                 brelse(qd->qd_bh);
 446                 qd->qd_bh = NULL;
 447                 qd->qd_bh_qc = NULL;
 448         }
 449         mutex_unlock(&sdp->sd_quota_mutex);
 450 }
 451
 452 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 453                          u64 *sync_gen)
 454 {
 455         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 456             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 457             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 458                 return 0;
 459
 460         /*
 461          * If qd_change is 0 it means a pending quota change was negated.
 462          * We should not sync it, but we still have a qd reference and slot
 463          * reference taken by gfs2_quota_change -> do_qc that need to be put.
 464          */
 465         if (!qd->qd_change && test_and_clear_bit(QDF_CHANGE, &qd->qd_flags)) {
 466                 slot_put(qd);
 467                 qd_put(qd);
 468                 return 0;
 469         }
 470
 471         if (!lockref_get_not_dead(&qd->qd_lockref))
 472                 return 0;
 473
 474         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 475         set_bit(QDF_LOCKED, &qd->qd_flags);
 476         qd->qd_change_sync = qd->qd_change;
 477         slot_hold(qd);
 478         return 1;
 479 }
 480
 481 static int qd_bh_get_or_undo(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 482 {
 483         int error;
 484
 485         error = bh_get(qd);
 486         if (!error)
 487                 return 0;
 488
 489         clear_bit(QDF_LOCKED, &qd->qd_flags);
 490         slot_put(qd);
 491         qd_put(qd);
 492         return error;
 493 }
 494
 495 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 496 {
 497         struct gfs2_quota_data *qd = NULL, *iter;
 498         int error;
 499
 500         *qdp = NULL;
 501
 502         if (sb_rdonly(sdp->sd_vfs))
 503                 return 0;
 504
 505         spin_lock(&qd_lock);
 506
 507         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 508                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 509                         qd = iter;
 510                         break;
 511                 }
 512         }
 513
 514         spin_unlock(&qd_lock);
 515
 516         if (qd) {
 517                 error = qd_bh_get_or_undo(sdp, qd);
 518                 if (error)
 519                         return error;
 520                 *qdp = qd;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static void qdsb_put(struct gfs2_quota_data *qd)
 527 {
 528         bh_put(qd);
 529         slot_put(qd);
 530         qd_put(qd);
 531 }
 532
 533 static void qd_unlock(struct gfs2_quota_data *qd)
 534 {
 535         gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
 536         clear_bit(QDF_LOCKED, &qd->qd_flags);
 537         qdsb_put(qd);
 538 }
 539
 540 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 541                     struct gfs2_quota_data **qdp)
 542 {
 543         int error;
 544
 545         error = qd_get(sdp, qid, qdp);
 546         if (error)
 547                 return error;
 548
 549         error = slot_get(*qdp);
 550         if (error)
 551                 goto fail;
 552
 553         error = bh_get(*qdp);
 554         if (error)
 555                 goto fail_slot;
 556
 557         return 0;
 558
 559 fail_slot:
 560         slot_put(*qdp);
 561 fail:
 562         qd_put(*qdp);
 563         return error;
 564 }
 565
 566 /**
 567  * gfs2_qa_get - make sure we have a quota allocations data structure,
 568  *               if necessary
 569  * @ip: the inode for this reservation
 570  */
 571 int gfs2_qa_get(struct gfs2_inode *ip)
 572 {
 573         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 574         struct inode *inode = &ip->i_inode;
 575
 576         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 577                 return 0;
 578
 579         spin_lock(&inode->i_lock);
 580         if (ip->i_qadata == NULL) {
 581                 struct gfs2_qadata *tmp;
 582
 583                 spin_unlock(&inode->i_lock);
 584                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 585                 if (!tmp)
 586                         return -ENOMEM;
 587
 588                 spin_lock(&inode->i_lock);
 589                 if (ip->i_qadata == NULL)
 590                         ip->i_qadata = tmp;
 591                 else
 592                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 593         }
 594         ip->i_qadata->qa_ref++;
 595         spin_unlock(&inode->i_lock);
 596         return 0;
 597 }
 598
 599 void gfs2_qa_put(struct gfs2_inode *ip)
 600 {
 601         struct inode *inode = &ip->i_inode;
 602
 603         spin_lock(&inode->i_lock);
 604         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 605                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 606                 ip->i_qadata = NULL;
 607         }
 608         spin_unlock(&inode->i_lock);
 609 }
 610
 611 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 612 {
 613         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 614         struct gfs2_quota_data **qd;
 615         int error;
 616
 617         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 618                 return 0;
 619
 620         error = gfs2_qa_get(ip);
 621         if (error)
 622                 return error;
 623
 624         qd = ip->i_qadata->qa_qd;
 625
 626         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 627             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 628                 error = -EIO;
 629                 gfs2_qa_put(ip);
 630                 goto out;
 631         }
 632
 633         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 634         if (error)
 635                 goto out_unhold;
 636         ip->i_qadata->qa_qd_num++;
 637         qd++;
 638
 639         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 640         if (error)
 641                 goto out_unhold;
 642         ip->i_qadata->qa_qd_num++;
 643         qd++;
 644
 645         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 646             !uid_eq(uid, ip->i_inode.i_uid)) {
 647                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 648                 if (error)
 649                         goto out_unhold;
 650                 ip->i_qadata->qa_qd_num++;
 651                 qd++;
 652         }
 653
 654         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 655             !gid_eq(gid, ip->i_inode.i_gid)) {
 656                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 657                 if (error)
 658                         goto out_unhold;
 659                 ip->i_qadata->qa_qd_num++;
 660                 qd++;
 661         }
 662
 663 out_unhold:
 664         if (error)
 665                 gfs2_quota_unhold(ip);
 666 out:
 667         return error;
 668 }
 669
 670 void gfs2_quota_unhold(struct gfs2_inode *ip)
 671 {
 672         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 673         u32 x;
 674
 675         if (ip->i_qadata == NULL)
 676                 return;
 677
 678         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 679
 680         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 681                 qdsb_put(ip->i_qadata->qa_qd[x]);
 682                 ip->i_qadata->qa_qd[x] = NULL;
 683         }
 684         ip->i_qadata->qa_qd_num = 0;
 685         gfs2_qa_put(ip);
 686 }
 687
 688 static int sort_qd(const void *a, const void *b)
 689 {
 690         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 691         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 692
 693         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 694                 return -1;
 695         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 696                 return 1;
 697         return 0;
 698 }
 699
 700 static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 701 {
 702         struct gfs2_sbd *sdp = qd->qd_sbd;
 703         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 704         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 705         s64 x;
 706
 707         mutex_lock(&sdp->sd_quota_mutex);
 708         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 709
 710         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 711                 qc->qc_change = 0;
 712                 qc->qc_flags = 0;
 713                 if (qd->qd_id.type == USRQUOTA)
 714                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 715                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 716         }
 717
 718         x = be64_to_cpu(qc->qc_change) + change;
 719         qc->qc_change = cpu_to_be64(x);
 720
 721         spin_lock(&qd_lock);
 722         qd->qd_change = x;
 723         spin_unlock(&qd_lock);
 724
 725         if (qc_type == QC_CHANGE) {
 726                 if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 727                         qd_hold(qd);
 728                         slot_hold(qd);
 729                 }
 730         } else {
 731                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 732                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 733                 qc->qc_flags = 0;
 734                 qc->qc_id = 0;
 735                 slot_put(qd);
 736                 qd_put(qd);
 737         }
 738
 739         if (change < 0) /* Reset quiet flag if we freed some blocks */
 740                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 741         mutex_unlock(&sdp->sd_quota_mutex);
 742 }
 743
 744 static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
 745                                   unsigned off, void *buf, unsigned bytes)
 746 {
 747         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 748         struct inode *inode = &ip->i_inode;
 749         struct address_space *mapping = inode->i_mapping;
 750         struct page *page;
 751         struct buffer_head *bh;
 752         u64 blk;
 753         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 754         unsigned to_write = bytes, pg_off = off;
 755
 756         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 757         boff = off % bsize;
 758
 759         page = grab_cache_page(mapping, index);
 760         if (!page)
 761                 return -ENOMEM;
 762         if (!page_has_buffers(page))
 763                 create_empty_buffers(page, bsize, 0);
 764
 765         bh = page_buffers(page);
 766         for(;;) {
 767                 /* Find the beginning block within the page */
 768                 if (pg_off >= ((bnum * bsize) + bsize)) {
 769                         bh = bh->b_this_page;
 770                         bnum++;
 771                         blk++;
 772                         continue;
 773                 }
 774                 if (!buffer_mapped(bh)) {
 775                         gfs2_block_map(inode, blk, bh, 1);
 776                         if (!buffer_mapped(bh))
 777                                 goto unlock_out;
 778                         /* If it's a newly allocated disk block, zero it */
 779                         if (buffer_new(bh))
 780                                 zero_user(page, bnum * bsize, bh->b_size);
 781                 }
 782                 if (PageUptodate(page))
 783                         set_buffer_uptodate(bh);
 784                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 785                         goto unlock_out;
 786                 gfs2_trans_add_data(ip->i_gl, bh);
 787
 788                 /* If we need to write to the next block as well */
 789                 if (to_write > (bsize - boff)) {
 790                         pg_off += (bsize - boff);
 791                         to_write -= (bsize - boff);
 792                         boff = pg_off % bsize;
 793                         continue;
 794                 }
 795                 break;
 796         }
 797
 798         /* Write to the page, now that we have setup the buffer(s) */
 799         memcpy_to_page(page, off, buf, bytes);
 800         flush_dcache_page(page);
 801         unlock_page(page);
 802         put_page(page);
 803
 804         return 0;
 805
 806 unlock_out:
 807         unlock_page(page);
 808         put_page(page);
 809         return -EIO;
 810 }
 811
 812 static int gfs2_write_disk_quota(struct gfs2_sbd *sdp, struct gfs2_quota *qp,
 813                                  loff_t loc)
 814 {
 815         unsigned long pg_beg;
 816         unsigned pg_off, nbytes, overflow = 0;
 817         int error;
 818         void *ptr;
 819
 820         nbytes = sizeof(struct gfs2_quota);
 821
 822         pg_beg = loc >> PAGE_SHIFT;
 823         pg_off = offset_in_page(loc);
 824
 825         /* If the quota straddles a page boundary, split the write in two */
 826         if ((pg_off + nbytes) > PAGE_SIZE)
 827                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 828
 829         ptr = qp;
 830         error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
 831                                        nbytes - overflow);
 832         /* If there's an overflow, write the remaining bytes to the next page */
 833         if (!error && overflow)
 834                 error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
 835                                                ptr + nbytes - overflow,
 836                                                overflow);
 837         return error;
 838 }
 839
 840 /**
 841  * gfs2_adjust_quota - adjust record of current block usage
 842  * @sdp: The superblock
 843  * @loc: Offset of the entry in the quota file
 844  * @change: The amount of usage change to record
 845  * @qd: The quota data
 846  * @fdq: The updated limits to record
 847  *
 848  * This function was mostly borrowed from gfs2_block_truncate_page which was
 849  * in turn mostly borrowed from ext3
 850  *
 851  * Returns: 0 or -ve on error
 852  */
 853
 854 static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
 855                              s64 change, struct gfs2_quota_data *qd,
 856                              struct qc_dqblk *fdq)
 857 {
 858         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 859         struct inode *inode = &ip->i_inode;
 860         struct gfs2_quota q;
 861         int err;
 862         u64 size;
 863
 864         if (gfs2_is_stuffed(ip)) {
 865                 err = gfs2_unstuff_dinode(ip);
 866                 if (err)
 867                         return err;
 868         }
 869
 870         memset(&q, 0, sizeof(struct gfs2_quota));
 871         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 872         if (err < 0)
 873                 return err;
 874
 875         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 876         be64_add_cpu(&q.qu_value, change);
 877         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 878                 q.qu_value = 0; /* Never go negative on quota usage */
 879         qd->qd_qb.qb_value = q.qu_value;
 880         if (fdq) {
 881                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 882                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 883                         qd->qd_qb.qb_warn = q.qu_warn;
 884                 }
 885                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 886                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 887                         qd->qd_qb.qb_limit = q.qu_limit;
 888                 }
 889                 if (fdq->d_fieldmask & QC_SPACE) {
 890                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 891                         qd->qd_qb.qb_value = q.qu_value;
 892                 }
 893         }
 894
 895         err = gfs2_write_disk_quota(sdp, &q, loc);
 896         if (!err) {
 897                 size = loc + sizeof(struct gfs2_quota);
 898                 if (size > inode->i_size)
 899                         i_size_write(inode, size);
 900                 inode->i_mtime = inode_set_ctime_current(inode);
 901                 mark_inode_dirty(inode);
 902                 set_bit(QDF_REFRESH, &qd->qd_flags);
 903         }
 904
 905         return err;
 906 }
 907
 908 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 909 {
 910         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 911         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 912         struct gfs2_alloc_parms ap = { .aflags = 0, };
 913         unsigned int data_blocks, ind_blocks;
 914         struct gfs2_holder *ghs, i_gh;
 915         unsigned int qx, x;
 916         struct gfs2_quota_data *qd;
 917         unsigned reserved;
 918         loff_t offset;
 919         unsigned int nalloc = 0, blocks;
 920         int error;
 921
 922         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 923                               &data_blocks, &ind_blocks);
 924
 925         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 926         if (!ghs)
 927                 return -ENOMEM;
 928
 929         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 930         inode_lock(&ip->i_inode);
 931         for (qx = 0; qx < num_qd; qx++) {
 932                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 933                                            GL_NOCACHE, &ghs[qx]);
 934                 if (error)
 935                         goto out_dq;
 936         }
 937
 938         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 939         if (error)
 940                 goto out_dq;
 941
 942         for (x = 0; x < num_qd; x++) {
 943                 offset = qd2offset(qda[x]);
 944                 if (gfs2_write_alloc_required(ip, offset,
 945                                               sizeof(struct gfs2_quota)))
 946                         nalloc++;
 947         }
 948
 949         /*
 950          * 1 blk for unstuffing inode if stuffed. We add this extra
 951          * block to the reservation unconditionally. If the inode
 952          * doesn't need unstuffing, the block will be released to the
 953          * rgrp since it won't be allocated during the transaction
 954          */
 955         /* +3 in the end for unstuffing block, inode size update block
 956          * and another block in case quota straddles page boundary and
 957          * two blocks need to be updated instead of 1 */
 958         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 959
 960         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 961         ap.target = reserved;
 962         error = gfs2_inplace_reserve(ip, &ap);
 963         if (error)
 964                 goto out_alloc;
 965
 966         if (nalloc)
 967                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 968
 969         error = gfs2_trans_begin(sdp, blocks, 0);
 970         if (error)
 971                 goto out_ipres;
 972
 973         for (x = 0; x < num_qd; x++) {
 974                 qd = qda[x];
 975                 offset = qd2offset(qd);
 976                 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
 977                                                         NULL);
 978                 if (error)
 979                         goto out_end_trans;
 980
 981                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 982                 set_bit(QDF_REFRESH, &qd->qd_flags);
 983         }
 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         if (!error) {
 999                 for (x = 0; x < num_qd; x++)
1000                         qda[x]->qd_sync_gen = sdp->sd_quota_sync_gen;
1001         }
1002         return error;
1003 }
1004
1005 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
1006 {
1007         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1008         struct gfs2_quota q;
1009         struct gfs2_quota_lvb *qlvb;
1010         loff_t pos;
1011         int error;
1012
1013         memset(&q, 0, sizeof(struct gfs2_quota));
1014         pos = qd2offset(qd);
1015         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1016         if (error < 0)
1017                 return error;
1018
1019         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1020         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1021         qlvb->__pad = 0;
1022         qlvb->qb_limit = q.qu_limit;
1023         qlvb->qb_warn = q.qu_warn;
1024         qlvb->qb_value = q.qu_value;
1025         qd->qd_qb = *qlvb;
1026
1027         return 0;
1028 }
1029
1030 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1031                     struct gfs2_holder *q_gh)
1032 {
1033         struct gfs2_sbd *sdp = qd->qd_sbd;
1034         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1035         struct gfs2_holder i_gh;
1036         int error;
1037
1038         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1039 restart:
1040         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1041         if (error)
1042                 return error;
1043
1044         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1045                 force_refresh = FORCE;
1046
1047         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1048
1049         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1050                 gfs2_glock_dq_uninit(q_gh);
1051                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1052                                            GL_NOCACHE, q_gh);
1053                 if (error)
1054                         return error;
1055
1056                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1057                 if (error)
1058                         goto fail;
1059
1060                 error = update_qd(sdp, qd);
1061                 if (error)
1062                         goto fail_gunlock;
1063
1064                 gfs2_glock_dq_uninit(&i_gh);
1065                 gfs2_glock_dq_uninit(q_gh);
1066                 force_refresh = 0;
1067                 goto restart;
1068         }
1069
1070         return 0;
1071
1072 fail_gunlock:
1073         gfs2_glock_dq_uninit(&i_gh);
1074 fail:
1075         gfs2_glock_dq_uninit(q_gh);
1076         return error;
1077 }
1078
1079 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1080 {
1081         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1082         struct gfs2_quota_data *qd;
1083         u32 x;
1084         int error;
1085
1086         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1087             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1088                 return 0;
1089
1090         error = gfs2_quota_hold(ip, uid, gid);
1091         if (error)
1092                 return error;
1093
1094         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1095              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1096
1097         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1098                 qd = ip->i_qadata->qa_qd[x];
1099                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1100                 if (error)
1101                         break;
1102         }
1103
1104         if (!error)
1105                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1106         else {
1107                 while (x--)
1108                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1109                 gfs2_quota_unhold(ip);
1110         }
1111
1112         return error;
1113 }
1114
1115 static bool need_sync(struct gfs2_quota_data *qd)
1116 {
1117         struct gfs2_sbd *sdp = qd->qd_sbd;
1118         struct gfs2_tune *gt = &sdp->sd_tune;
1119         s64 value;
1120         unsigned int num, den;
1121
1122         if (!qd->qd_qb.qb_limit)
1123                 return false;
1124
1125         spin_lock(&qd_lock);
1126         value = qd->qd_change;
1127         spin_unlock(&qd_lock);
1128
1129         spin_lock(&gt->gt_spin);
1130         num = gt->gt_quota_scale_num;
1131         den = gt->gt_quota_scale_den;
1132         spin_unlock(&gt->gt_spin);
1133
1134         if (value <= 0)
1135                 return false;
1136         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1137                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1138                 return false;
1139         else {
1140                 value *= gfs2_jindex_size(sdp) * num;
1141                 value = div_s64(value, den);
1142                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1143                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1144                         return false;
1145         }
1146
1147         return true;
1148 }
1149
1150 void gfs2_quota_unlock(struct gfs2_inode *ip)
1151 {
1152         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1153         struct gfs2_quota_data *qda[2 * GFS2_MAXQUOTAS];
1154         unsigned int count = 0;
1155         u32 x;
1156         int found;
1157
1158         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1159                 return;
1160
1161         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1162                 struct gfs2_quota_data *qd;
1163                 bool sync;
1164
1165                 qd = ip->i_qadata->qa_qd[x];
1166                 sync = need_sync(qd);
1167
1168                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1169                 if (!sync)
1170                         continue;
1171
1172                 spin_lock(&qd_lock);
1173                 found = qd_check_sync(sdp, qd, NULL);
1174                 spin_unlock(&qd_lock);
1175
1176                 if (!found)
1177                         continue;
1178
1179                 if (!qd_bh_get_or_undo(sdp, qd))
1180                         qda[count++] = qd;
1181         }
1182
1183         if (count) {
1184                 do_sync(count, qda);
1185                 for (x = 0; x < count; x++)
1186                         qd_unlock(qda[x]);
1187         }
1188
1189         gfs2_quota_unhold(ip);
1190 }
1191
1192 #define MAX_LINE 256
1193
1194 static int print_message(struct gfs2_quota_data *qd, char *type)
1195 {
1196         struct gfs2_sbd *sdp = qd->qd_sbd;
1197
1198         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1199                 fs_info(sdp, "quota %s for %s %u\n",
1200                         type,
1201                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1202                         from_kqid(&init_user_ns, qd->qd_id));
1203
1204         return 0;
1205 }
1206
1207 /**
1208  * gfs2_quota_check - check if allocating new blocks will exceed quota
1209  * @ip:  The inode for which this check is being performed
1210  * @uid: The uid to check against
1211  * @gid: The gid to check against
1212  * @ap:  The allocation parameters. ap->target contains the requested
1213  *       blocks. ap->min_target, if set, contains the minimum blks
1214  *       requested.
1215  *
1216  * Returns: 0 on success.
1217  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1218  *                  quota must allow at least min_req blks for success and
1219  *                  ap->allowed is set to the number of blocks allowed
1220  *
1221  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1222  *                  of blocks available.
1223  */
1224 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1225                      struct gfs2_alloc_parms *ap)
1226 {
1227         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1228         struct gfs2_quota_data *qd;
1229         s64 value, warn, limit;
1230         u32 x;
1231         int error = 0;
1232
1233         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1234         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1235                 return 0;
1236
1237         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1238                 qd = ip->i_qadata->qa_qd[x];
1239
1240                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1241                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1242                         continue;
1243
1244                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1245                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1246                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1247                 spin_lock(&qd_lock);
1248                 value += qd->qd_change;
1249                 spin_unlock(&qd_lock);
1250
1251                 if (limit > 0 && (limit - value) < ap->allowed)
1252                         ap->allowed = limit - value;
1253                 /* If we can't meet the target */
1254                 if (limit && limit < (value + (s64)ap->target)) {
1255                         /* If no min_target specified or we don't meet
1256                          * min_target, return -EDQUOT */
1257                         if (!ap->min_target || ap->min_target > ap->allowed) {
1258                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1259                                                       &qd->qd_flags)) {
1260                                         print_message(qd, "exceeded");
1261                                         quota_send_warning(qd->qd_id,
1262                                                            sdp->sd_vfs->s_dev,
1263                                                            QUOTA_NL_BHARDWARN);
1264                                 }
1265                                 error = -EDQUOT;
1266                                 break;
1267                         }
1268                 } else if (warn && warn < value &&
1269                            time_after_eq(jiffies, qd->qd_last_warn +
1270                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1271                                          * HZ)) {
1272                         quota_send_warning(qd->qd_id,
1273                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1274                         error = print_message(qd, "warning");
1275                         qd->qd_last_warn = jiffies;
1276                 }
1277         }
1278         return error;
1279 }
1280
1281 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1282                        kuid_t uid, kgid_t gid)
1283 {
1284         struct gfs2_quota_data *qd;
1285         u32 x;
1286         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1287
1288         if ((sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1289             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) ||
1290             gfs2_assert_warn(sdp, change))
1291                 return;
1292         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1293                 return;
1294
1295         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1296                                  ip->i_qadata->qa_ref > 0))
1297                 return;
1298         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1299                 qd = ip->i_qadata->qa_qd[x];
1300
1301                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1302                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1303                         do_qc(qd, change, QC_CHANGE);
1304                 }
1305         }
1306 }
1307
1308 static bool qd_changed(struct gfs2_sbd *sdp)
1309 {
1310         struct gfs2_quota_data *qd;
1311         bool changed = false;
1312
1313         spin_lock(&qd_lock);
1314         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1315                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
1316                     !test_bit(QDF_CHANGE, &qd->qd_flags))
1317                         continue;
1318
1319                 changed = true;
1320                 break;
1321         }
1322         spin_unlock(&qd_lock);
1323         return changed;
1324 }
1325
1326 int gfs2_quota_sync(struct super_block *sb, int type)
1327 {
1328         struct gfs2_sbd *sdp = sb->s_fs_info;
1329         struct gfs2_quota_data **qda;
1330         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1331         unsigned int num_qd;
1332         unsigned int x;
1333         int error = 0;
1334
1335         if (!qd_changed(sdp))
1336                 return 0;
1337
1338         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1339         if (!qda)
1340                 return -ENOMEM;
1341
1342         mutex_lock(&sdp->sd_quota_sync_mutex);
1343         sdp->sd_quota_sync_gen++;
1344
1345         do {
1346                 num_qd = 0;
1347
1348                 for (;;) {
1349                         error = qd_fish(sdp, qda + num_qd);
1350                         if (error || !qda[num_qd])
1351                                 break;
1352                         if (++num_qd == max_qd)
1353                                 break;
1354                 }
1355
1356                 if (num_qd) {
1357                         if (!error)
1358                                 error = do_sync(num_qd, qda);
1359
1360                         for (x = 0; x < num_qd; x++)
1361                                 qd_unlock(qda[x]);
1362                 }
1363         } while (!error && num_qd == max_qd);
1364
1365         mutex_unlock(&sdp->sd_quota_sync_mutex);
1366         kfree(qda);
1367
1368         return error;
1369 }
1370
1371 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1372 {
1373         struct gfs2_quota_data *qd;
1374         struct gfs2_holder q_gh;
1375         int error;
1376
1377         error = qd_get(sdp, qid, &qd);
1378         if (error)
1379                 return error;
1380
1381         error = do_glock(qd, FORCE, &q_gh);
1382         if (!error)
1383                 gfs2_glock_dq_uninit(&q_gh);
1384
1385         qd_put(qd);
1386         return error;
1387 }
1388
1389 int gfs2_quota_init(struct gfs2_sbd *sdp)
1390 {
1391         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1392         u64 size = i_size_read(sdp->sd_qc_inode);
1393         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1394         unsigned int x, slot = 0;
1395         unsigned int found = 0;
1396         unsigned int hash;
1397         unsigned int bm_size;
1398         u64 dblock;
1399         u32 extlen = 0;
1400         int error;
1401
1402         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1403                 return -EIO;
1404
1405         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1406         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1407         bm_size *= sizeof(unsigned long);
1408         error = -ENOMEM;
1409         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1410         if (sdp->sd_quota_bitmap == NULL)
1411                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1412                                                  __GFP_ZERO);
1413         if (!sdp->sd_quota_bitmap)
1414                 return error;
1415
1416         for (x = 0; x < blocks; x++) {
1417                 struct buffer_head *bh;
1418                 const struct gfs2_quota_change *qc;
1419                 unsigned int y;
1420
1421                 if (!extlen) {
1422                         extlen = 32;
1423                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1424                         if (error)
1425                                 goto fail;
1426                 }
1427                 error = -EIO;
1428                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1429                 if (!bh)
1430                         goto fail;
1431                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1432                         brelse(bh);
1433                         goto fail;
1434                 }
1435
1436                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1437                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1438                      y++, slot++) {
1439                         struct gfs2_quota_data *qd;
1440                         s64 qc_change = be64_to_cpu(qc->qc_change);
1441                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1442                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1443                                                 USRQUOTA : GRPQUOTA;
1444                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1445                                                       be32_to_cpu(qc->qc_id));
1446                         qc++;
1447                         if (!qc_change)
1448                                 continue;
1449
1450                         hash = gfs2_qd_hash(sdp, qc_id);
1451                         qd = qd_alloc(hash, sdp, qc_id);
1452                         if (qd == NULL) {
1453                                 brelse(bh);
1454                                 goto fail;
1455                         }
1456
1457                         set_bit(QDF_CHANGE, &qd->qd_flags);
1458                         qd->qd_change = qc_change;
1459                         qd->qd_slot = slot;
1460                         qd->qd_slot_ref = 1;
1461
1462                         spin_lock(&qd_lock);
1463                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1464                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1465                         atomic_inc(&sdp->sd_quota_count);
1466                         spin_unlock(&qd_lock);
1467
1468                         spin_lock_bucket(hash);
1469                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1470                         spin_unlock_bucket(hash);
1471
1472                         found++;
1473                 }
1474
1475                 brelse(bh);
1476                 dblock++;
1477                 extlen--;
1478         }
1479
1480         if (found)
1481                 fs_info(sdp, "found %u quota changes\n", found);
1482
1483         return 0;
1484
1485 fail:
1486         gfs2_quota_cleanup(sdp);
1487         return error;
1488 }
1489
1490 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1491 {
1492         struct gfs2_quota_data *qd;
1493         LIST_HEAD(dispose);
1494         int count;
1495
1496         BUG_ON(!test_bit(SDF_NORECOVERY, &sdp->sd_flags) &&
1497                 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1498
1499         spin_lock(&qd_lock);
1500         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1501                 spin_lock(&qd->qd_lockref.lock);
1502                 if (qd->qd_lockref.count != 0) {
1503                         spin_unlock(&qd->qd_lockref.lock);
1504                         continue;
1505                 }
1506                 lockref_mark_dead(&qd->qd_lockref);
1507                 spin_unlock(&qd->qd_lockref.lock);
1508
1509                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1510                 list_add(&qd->qd_lru, &dispose);
1511         }
1512         spin_unlock(&qd_lock);
1513
1514         gfs2_qd_list_dispose(&dispose);
1515
1516         wait_event_timeout(sdp->sd_kill_wait,
1517                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1518                 HZ * 60);
1519
1520         if (count != 0)
1521                 fs_err(sdp, "%d left-over quota data objects\n", count);
1522
1523         kvfree(sdp->sd_quota_bitmap);
1524         sdp->sd_quota_bitmap = NULL;
1525 }
1526
1527 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1528 {
1529         if (error == 0 || error == -EROFS)
1530                 return;
1531         if (!gfs2_withdrawn(sdp)) {
1532                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1533                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1534                 wake_up(&sdp->sd_logd_waitq);
1535         }
1536 }
1537
1538 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1539                                int (*fxn)(struct super_block *sb, int type),
1540                                unsigned long t, unsigned long *timeo,
1541                                unsigned int *new_timeo)
1542 {
1543         if (t >= *timeo) {
1544                 int error = fxn(sdp->sd_vfs, 0);
1545                 quotad_error(sdp, msg, error);
1546                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1547         } else {
1548                 *timeo -= t;
1549         }
1550 }
1551
1552 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1553         if (!sdp->sd_statfs_force_sync) {
1554                 sdp->sd_statfs_force_sync = 1;
1555                 wake_up(&sdp->sd_quota_wait);
1556         }
1557 }
1558
1559
1560 /**
1561  * gfs2_quotad - Write cached quota changes into the quota file
1562  * @data: Pointer to GFS2 superblock
1563  *
1564  */
1565
1566 int gfs2_quotad(void *data)
1567 {
1568         struct gfs2_sbd *sdp = data;
1569         struct gfs2_tune *tune = &sdp->sd_tune;
1570         unsigned long statfs_timeo = 0;
1571         unsigned long quotad_timeo = 0;
1572         unsigned long t = 0;
1573
1574         while (!kthread_should_stop()) {
1575                 if (gfs2_withdrawn(sdp))
1576                         break;
1577
1578                 /* Update the master statfs file */
1579                 if (sdp->sd_statfs_force_sync) {
1580                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1581                         quotad_error(sdp, "statfs", error);
1582                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1583                 }
1584                 else
1585                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1586                                            &statfs_timeo,
1587                                            &tune->gt_statfs_quantum);
1588
1589                 /* Update quota file */
1590                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1591                                    &quotad_timeo, &tune->gt_quota_quantum);
1592
1593                 try_to_freeze();
1594
1595                 t = min(quotad_timeo, statfs_timeo);
1596
1597                 t = wait_event_interruptible_timeout(sdp->sd_quota_wait,
1598                                 sdp->sd_statfs_force_sync ||
1599                                 gfs2_withdrawn(sdp) ||
1600                                 kthread_should_stop(),
1601                                 t);
1602
1603                 if (sdp->sd_statfs_force_sync)
1604                         t = 0;
1605         }
1606
1607         return 0;
1608 }
1609
1610 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1611 {
1612         struct gfs2_sbd *sdp = sb->s_fs_info;
1613
1614         memset(state, 0, sizeof(*state));
1615
1616         switch (sdp->sd_args.ar_quota) {
1617         case GFS2_QUOTA_QUIET:
1618                 fallthrough;
1619         case GFS2_QUOTA_ON:
1620                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1621                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1622                 fallthrough;
1623         case GFS2_QUOTA_ACCOUNT:
1624                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1625                                                   QCI_SYSFILE;
1626                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1627                                                   QCI_SYSFILE;
1628                 break;
1629         case GFS2_QUOTA_OFF:
1630                 break;
1631         }
1632         if (sdp->sd_quota_inode) {
1633                 state->s_state[USRQUOTA].ino =
1634                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1635                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1636         }
1637         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1638         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1639         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1640         return 0;
1641 }
1642
1643 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1644                           struct qc_dqblk *fdq)
1645 {
1646         struct gfs2_sbd *sdp = sb->s_fs_info;
1647         struct gfs2_quota_lvb *qlvb;
1648         struct gfs2_quota_data *qd;
1649         struct gfs2_holder q_gh;
1650         int error;
1651
1652         memset(fdq, 0, sizeof(*fdq));
1653
1654         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1655                 return -ESRCH; /* Crazy XFS error code */
1656
1657         if ((qid.type != USRQUOTA) &&
1658             (qid.type != GRPQUOTA))
1659                 return -EINVAL;
1660
1661         error = qd_get(sdp, qid, &qd);
1662         if (error)
1663                 return error;
1664         error = do_glock(qd, FORCE, &q_gh);
1665         if (error)
1666                 goto out;
1667
1668         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1669         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1670         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1671         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1672
1673         gfs2_glock_dq_uninit(&q_gh);
1674 out:
1675         qd_put(qd);
1676         return error;
1677 }
1678
1679 /* GFS2 only supports a subset of the XFS fields */
1680 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1681
1682 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1683                           struct qc_dqblk *fdq)
1684 {
1685         struct gfs2_sbd *sdp = sb->s_fs_info;
1686         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1687         struct gfs2_quota_data *qd;
1688         struct gfs2_holder q_gh, i_gh;
1689         unsigned int data_blocks, ind_blocks;
1690         unsigned int blocks = 0;
1691         int alloc_required;
1692         loff_t offset;
1693         int error;
1694
1695         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1696                 return -ESRCH; /* Crazy XFS error code */
1697
1698         if ((qid.type != USRQUOTA) &&
1699             (qid.type != GRPQUOTA))
1700                 return -EINVAL;
1701
1702         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1703                 return -EINVAL;
1704
1705         error = qd_get(sdp, qid, &qd);
1706         if (error)
1707                 return error;
1708
1709         error = gfs2_qa_get(ip);
1710         if (error)
1711                 goto out_put;
1712
1713         inode_lock(&ip->i_inode);
1714         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1715         if (error)
1716                 goto out_unlockput;
1717         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1718         if (error)
1719                 goto out_q;
1720
1721         /* Check for existing entry, if none then alloc new blocks */
1722         error = update_qd(sdp, qd);
1723         if (error)
1724                 goto out_i;
1725
1726         /* If nothing has changed, this is a no-op */
1727         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1728             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1729                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1730
1731         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1732             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1733                 fdq->d_fieldmask ^= QC_SPC_HARD;
1734
1735         if ((fdq->d_fieldmask & QC_SPACE) &&
1736             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1737                 fdq->d_fieldmask ^= QC_SPACE;
1738
1739         if (fdq->d_fieldmask == 0)
1740                 goto out_i;
1741
1742         offset = qd2offset(qd);
1743         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1744         if (gfs2_is_stuffed(ip))
1745                 alloc_required = 1;
1746         if (alloc_required) {
1747                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1748                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1749                                        &data_blocks, &ind_blocks);
1750                 blocks = 1 + data_blocks + ind_blocks;
1751                 ap.target = blocks;
1752                 error = gfs2_inplace_reserve(ip, &ap);
1753                 if (error)
1754                         goto out_i;
1755                 blocks += gfs2_rg_blocks(ip, blocks);
1756         }
1757
1758         /* Some quotas span block boundaries and can update two blocks,
1759            adding an extra block to the transaction to handle such quotas */
1760         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1761         if (error)
1762                 goto out_release;
1763
1764         /* Apply changes */
1765         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1766         if (!error)
1767                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1768
1769         gfs2_trans_end(sdp);
1770 out_release:
1771         if (alloc_required)
1772                 gfs2_inplace_release(ip);
1773 out_i:
1774         gfs2_glock_dq_uninit(&i_gh);
1775 out_q:
1776         gfs2_glock_dq_uninit(&q_gh);
1777 out_unlockput:
1778         gfs2_qa_put(ip);
1779         inode_unlock(&ip->i_inode);
1780 out_put:
1781         qd_put(qd);
1782         return error;
1783 }
1784
1785 const struct quotactl_ops gfs2_quotactl_ops = {
1786         .quota_sync     = gfs2_quota_sync,
1787         .get_state      = gfs2_quota_get_state,
1788         .get_dqblk      = gfs2_get_dqblk,
1789         .set_dqblk      = gfs2_set_dqblk,
1790 };
1791
1792 void __init gfs2_quota_hash_init(void)
1793 {
1794         unsigned i;
1795
1796         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1797                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1798 }