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         if (!lockref_get_not_dead(&qd->qd_lockref))
 461                 return 0;
 462
 463         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 464         set_bit(QDF_LOCKED, &qd->qd_flags);
 465         qd->qd_change_sync = qd->qd_change;
 466         slot_hold(qd);
 467         return 1;
 468 }
 469
 470 static int qd_bh_get_or_undo(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 471 {
 472         int error;
 473
 474         error = bh_get(qd);
 475         if (!error)
 476                 return 0;
 477
 478         clear_bit(QDF_LOCKED, &qd->qd_flags);
 479         slot_put(qd);
 480         qd_put(qd);
 481         return error;
 482 }
 483
 484 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 485 {
 486         struct gfs2_quota_data *qd = NULL, *iter;
 487         int error;
 488
 489         *qdp = NULL;
 490
 491         if (sb_rdonly(sdp->sd_vfs))
 492                 return 0;
 493
 494         spin_lock(&qd_lock);
 495
 496         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 497                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 498                         qd = iter;
 499                         break;
 500                 }
 501         }
 502
 503         spin_unlock(&qd_lock);
 504
 505         if (qd) {
 506                 error = qd_bh_get_or_undo(sdp, qd);
 507                 if (error)
 508                         return error;
 509                 *qdp = qd;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static void qdsb_put(struct gfs2_quota_data *qd)
 516 {
 517         bh_put(qd);
 518         slot_put(qd);
 519         qd_put(qd);
 520 }
 521
 522 static void qd_unlock(struct gfs2_quota_data *qd)
 523 {
 524         gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
 525         clear_bit(QDF_LOCKED, &qd->qd_flags);
 526         qdsb_put(qd);
 527 }
 528
 529 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 530                     struct gfs2_quota_data **qdp)
 531 {
 532         int error;
 533
 534         error = qd_get(sdp, qid, qdp);
 535         if (error)
 536                 return error;
 537
 538         error = slot_get(*qdp);
 539         if (error)
 540                 goto fail;
 541
 542         error = bh_get(*qdp);
 543         if (error)
 544                 goto fail_slot;
 545
 546         return 0;
 547
 548 fail_slot:
 549         slot_put(*qdp);
 550 fail:
 551         qd_put(*qdp);
 552         return error;
 553 }
 554
 555 /**
 556  * gfs2_qa_get - make sure we have a quota allocations data structure,
 557  *               if necessary
 558  * @ip: the inode for this reservation
 559  */
 560 int gfs2_qa_get(struct gfs2_inode *ip)
 561 {
 562         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 563         struct inode *inode = &ip->i_inode;
 564
 565         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 566                 return 0;
 567
 568         spin_lock(&inode->i_lock);
 569         if (ip->i_qadata == NULL) {
 570                 struct gfs2_qadata *tmp;
 571
 572                 spin_unlock(&inode->i_lock);
 573                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 574                 if (!tmp)
 575                         return -ENOMEM;
 576
 577                 spin_lock(&inode->i_lock);
 578                 if (ip->i_qadata == NULL)
 579                         ip->i_qadata = tmp;
 580                 else
 581                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 582         }
 583         ip->i_qadata->qa_ref++;
 584         spin_unlock(&inode->i_lock);
 585         return 0;
 586 }
 587
 588 void gfs2_qa_put(struct gfs2_inode *ip)
 589 {
 590         struct inode *inode = &ip->i_inode;
 591
 592         spin_lock(&inode->i_lock);
 593         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 594                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 595                 ip->i_qadata = NULL;
 596         }
 597         spin_unlock(&inode->i_lock);
 598 }
 599
 600 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 601 {
 602         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 603         struct gfs2_quota_data **qd;
 604         int error;
 605
 606         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 607                 return 0;
 608
 609         error = gfs2_qa_get(ip);
 610         if (error)
 611                 return error;
 612
 613         qd = ip->i_qadata->qa_qd;
 614
 615         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 616             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 617                 error = -EIO;
 618                 gfs2_qa_put(ip);
 619                 goto out;
 620         }
 621
 622         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 623         if (error)
 624                 goto out_unhold;
 625         ip->i_qadata->qa_qd_num++;
 626         qd++;
 627
 628         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 629         if (error)
 630                 goto out_unhold;
 631         ip->i_qadata->qa_qd_num++;
 632         qd++;
 633
 634         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 635             !uid_eq(uid, ip->i_inode.i_uid)) {
 636                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 637                 if (error)
 638                         goto out_unhold;
 639                 ip->i_qadata->qa_qd_num++;
 640                 qd++;
 641         }
 642
 643         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 644             !gid_eq(gid, ip->i_inode.i_gid)) {
 645                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 646                 if (error)
 647                         goto out_unhold;
 648                 ip->i_qadata->qa_qd_num++;
 649                 qd++;
 650         }
 651
 652 out_unhold:
 653         if (error)
 654                 gfs2_quota_unhold(ip);
 655 out:
 656         return error;
 657 }
 658
 659 void gfs2_quota_unhold(struct gfs2_inode *ip)
 660 {
 661         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 662         u32 x;
 663
 664         if (ip->i_qadata == NULL)
 665                 return;
 666
 667         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 668
 669         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 670                 qdsb_put(ip->i_qadata->qa_qd[x]);
 671                 ip->i_qadata->qa_qd[x] = NULL;
 672         }
 673         ip->i_qadata->qa_qd_num = 0;
 674         gfs2_qa_put(ip);
 675 }
 676
 677 static int sort_qd(const void *a, const void *b)
 678 {
 679         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 680         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 681
 682         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 683                 return -1;
 684         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 685                 return 1;
 686         return 0;
 687 }
 688
 689 static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 690 {
 691         struct gfs2_sbd *sdp = qd->qd_sbd;
 692         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 693         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 694         s64 x;
 695
 696         mutex_lock(&sdp->sd_quota_mutex);
 697         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 698
 699         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 700                 qc->qc_change = 0;
 701                 qc->qc_flags = 0;
 702                 if (qd->qd_id.type == USRQUOTA)
 703                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 704                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 705         }
 706
 707         x = be64_to_cpu(qc->qc_change) + change;
 708         qc->qc_change = cpu_to_be64(x);
 709
 710         spin_lock(&qd_lock);
 711         qd->qd_change = x;
 712         spin_unlock(&qd_lock);
 713
 714         if (qc_type == QC_CHANGE) {
 715                 if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 716                         qd_hold(qd);
 717                         slot_hold(qd);
 718                 }
 719         } else {
 720                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 721                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 722                 qc->qc_flags = 0;
 723                 qc->qc_id = 0;
 724                 slot_put(qd);
 725                 qd_put(qd);
 726         }
 727
 728         if (change < 0) /* Reset quiet flag if we freed some blocks */
 729                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 730         mutex_unlock(&sdp->sd_quota_mutex);
 731 }
 732
 733 static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
 734                                   unsigned off, void *buf, unsigned bytes)
 735 {
 736         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 737         struct inode *inode = &ip->i_inode;
 738         struct address_space *mapping = inode->i_mapping;
 739         struct page *page;
 740         struct buffer_head *bh;
 741         u64 blk;
 742         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 743         unsigned to_write = bytes, pg_off = off;
 744
 745         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 746         boff = off % bsize;
 747
 748         page = grab_cache_page(mapping, index);
 749         if (!page)
 750                 return -ENOMEM;
 751         if (!page_has_buffers(page))
 752                 create_empty_buffers(page, bsize, 0);
 753
 754         bh = page_buffers(page);
 755         for(;;) {
 756                 /* Find the beginning block within the page */
 757                 if (pg_off >= ((bnum * bsize) + bsize)) {
 758                         bh = bh->b_this_page;
 759                         bnum++;
 760                         blk++;
 761                         continue;
 762                 }
 763                 if (!buffer_mapped(bh)) {
 764                         gfs2_block_map(inode, blk, bh, 1);
 765                         if (!buffer_mapped(bh))
 766                                 goto unlock_out;
 767                         /* If it's a newly allocated disk block, zero it */
 768                         if (buffer_new(bh))
 769                                 zero_user(page, bnum * bsize, bh->b_size);
 770                 }
 771                 if (PageUptodate(page))
 772                         set_buffer_uptodate(bh);
 773                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 774                         goto unlock_out;
 775                 gfs2_trans_add_data(ip->i_gl, bh);
 776
 777                 /* If we need to write to the next block as well */
 778                 if (to_write > (bsize - boff)) {
 779                         pg_off += (bsize - boff);
 780                         to_write -= (bsize - boff);
 781                         boff = pg_off % bsize;
 782                         continue;
 783                 }
 784                 break;
 785         }
 786
 787         /* Write to the page, now that we have setup the buffer(s) */
 788         memcpy_to_page(page, off, buf, bytes);
 789         flush_dcache_page(page);
 790         unlock_page(page);
 791         put_page(page);
 792
 793         return 0;
 794
 795 unlock_out:
 796         unlock_page(page);
 797         put_page(page);
 798         return -EIO;
 799 }
 800
 801 static int gfs2_write_disk_quota(struct gfs2_sbd *sdp, struct gfs2_quota *qp,
 802                                  loff_t loc)
 803 {
 804         unsigned long pg_beg;
 805         unsigned pg_off, nbytes, overflow = 0;
 806         int error;
 807         void *ptr;
 808
 809         nbytes = sizeof(struct gfs2_quota);
 810
 811         pg_beg = loc >> PAGE_SHIFT;
 812         pg_off = offset_in_page(loc);
 813
 814         /* If the quota straddles a page boundary, split the write in two */
 815         if ((pg_off + nbytes) > PAGE_SIZE)
 816                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 817
 818         ptr = qp;
 819         error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
 820                                        nbytes - overflow);
 821         /* If there's an overflow, write the remaining bytes to the next page */
 822         if (!error && overflow)
 823                 error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
 824                                                ptr + nbytes - overflow,
 825                                                overflow);
 826         return error;
 827 }
 828
 829 /**
 830  * gfs2_adjust_quota - adjust record of current block usage
 831  * @sdp: The superblock
 832  * @loc: Offset of the entry in the quota file
 833  * @change: The amount of usage change to record
 834  * @qd: The quota data
 835  * @fdq: The updated limits to record
 836  *
 837  * This function was mostly borrowed from gfs2_block_truncate_page which was
 838  * in turn mostly borrowed from ext3
 839  *
 840  * Returns: 0 or -ve on error
 841  */
 842
 843 static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
 844                              s64 change, struct gfs2_quota_data *qd,
 845                              struct qc_dqblk *fdq)
 846 {
 847         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 848         struct inode *inode = &ip->i_inode;
 849         struct gfs2_quota q;
 850         int err;
 851         u64 size;
 852
 853         if (gfs2_is_stuffed(ip)) {
 854                 err = gfs2_unstuff_dinode(ip);
 855                 if (err)
 856                         return err;
 857         }
 858
 859         memset(&q, 0, sizeof(struct gfs2_quota));
 860         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 861         if (err < 0)
 862                 return err;
 863
 864         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 865         be64_add_cpu(&q.qu_value, change);
 866         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 867                 q.qu_value = 0; /* Never go negative on quota usage */
 868         qd->qd_qb.qb_value = q.qu_value;
 869         if (fdq) {
 870                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 871                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 872                         qd->qd_qb.qb_warn = q.qu_warn;
 873                 }
 874                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 875                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 876                         qd->qd_qb.qb_limit = q.qu_limit;
 877                 }
 878                 if (fdq->d_fieldmask & QC_SPACE) {
 879                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 880                         qd->qd_qb.qb_value = q.qu_value;
 881                 }
 882         }
 883
 884         err = gfs2_write_disk_quota(sdp, &q, loc);
 885         if (!err) {
 886                 size = loc + sizeof(struct gfs2_quota);
 887                 if (size > inode->i_size)
 888                         i_size_write(inode, size);
 889                 inode->i_mtime = inode_set_ctime_current(inode);
 890                 mark_inode_dirty(inode);
 891                 set_bit(QDF_REFRESH, &qd->qd_flags);
 892         }
 893
 894         return err;
 895 }
 896
 897 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 898 {
 899         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 900         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 901         struct gfs2_alloc_parms ap = { .aflags = 0, };
 902         unsigned int data_blocks, ind_blocks;
 903         struct gfs2_holder *ghs, i_gh;
 904         unsigned int qx, x;
 905         struct gfs2_quota_data *qd;
 906         unsigned reserved;
 907         loff_t offset;
 908         unsigned int nalloc = 0, blocks;
 909         int error;
 910
 911         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 912                               &data_blocks, &ind_blocks);
 913
 914         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 915         if (!ghs)
 916                 return -ENOMEM;
 917
 918         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 919         inode_lock(&ip->i_inode);
 920         for (qx = 0; qx < num_qd; qx++) {
 921                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 922                                            GL_NOCACHE, &ghs[qx]);
 923                 if (error)
 924                         goto out_dq;
 925         }
 926
 927         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 928         if (error)
 929                 goto out_dq;
 930
 931         for (x = 0; x < num_qd; x++) {
 932                 offset = qd2offset(qda[x]);
 933                 if (gfs2_write_alloc_required(ip, offset,
 934                                               sizeof(struct gfs2_quota)))
 935                         nalloc++;
 936         }
 937
 938         /*
 939          * 1 blk for unstuffing inode if stuffed. We add this extra
 940          * block to the reservation unconditionally. If the inode
 941          * doesn't need unstuffing, the block will be released to the
 942          * rgrp since it won't be allocated during the transaction
 943          */
 944         /* +3 in the end for unstuffing block, inode size update block
 945          * and another block in case quota straddles page boundary and
 946          * two blocks need to be updated instead of 1 */
 947         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 948
 949         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 950         ap.target = reserved;
 951         error = gfs2_inplace_reserve(ip, &ap);
 952         if (error)
 953                 goto out_alloc;
 954
 955         if (nalloc)
 956                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 957
 958         error = gfs2_trans_begin(sdp, blocks, 0);
 959         if (error)
 960                 goto out_ipres;
 961
 962         for (x = 0; x < num_qd; x++) {
 963                 qd = qda[x];
 964                 offset = qd2offset(qd);
 965                 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
 966                                                         NULL);
 967                 if (error)
 968                         goto out_end_trans;
 969
 970                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 971                 set_bit(QDF_REFRESH, &qd->qd_flags);
 972         }
 973
 974 out_end_trans:
 975         gfs2_trans_end(sdp);
 976 out_ipres:
 977         gfs2_inplace_release(ip);
 978 out_alloc:
 979         gfs2_glock_dq_uninit(&i_gh);
 980 out_dq:
 981         while (qx--)
 982                 gfs2_glock_dq_uninit(&ghs[qx]);
 983         inode_unlock(&ip->i_inode);
 984         kfree(ghs);
 985         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 986                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 987         if (!error) {
 988                 for (x = 0; x < num_qd; x++)
 989                         qda[x]->qd_sync_gen = sdp->sd_quota_sync_gen;
 990         }
 991         return error;
 992 }
 993
 994 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 995 {
 996         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 997         struct gfs2_quota q;
 998         struct gfs2_quota_lvb *qlvb;
 999         loff_t pos;
1000         int error;
1001
1002         memset(&q, 0, sizeof(struct gfs2_quota));
1003         pos = qd2offset(qd);
1004         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1005         if (error < 0)
1006                 return error;
1007
1008         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1009         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1010         qlvb->__pad = 0;
1011         qlvb->qb_limit = q.qu_limit;
1012         qlvb->qb_warn = q.qu_warn;
1013         qlvb->qb_value = q.qu_value;
1014         qd->qd_qb = *qlvb;
1015
1016         return 0;
1017 }
1018
1019 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1020                     struct gfs2_holder *q_gh)
1021 {
1022         struct gfs2_sbd *sdp = qd->qd_sbd;
1023         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1024         struct gfs2_holder i_gh;
1025         int error;
1026
1027         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1028 restart:
1029         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1030         if (error)
1031                 return error;
1032
1033         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1034                 force_refresh = FORCE;
1035
1036         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1037
1038         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1039                 gfs2_glock_dq_uninit(q_gh);
1040                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1041                                            GL_NOCACHE, q_gh);
1042                 if (error)
1043                         return error;
1044
1045                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1046                 if (error)
1047                         goto fail;
1048
1049                 error = update_qd(sdp, qd);
1050                 if (error)
1051                         goto fail_gunlock;
1052
1053                 gfs2_glock_dq_uninit(&i_gh);
1054                 gfs2_glock_dq_uninit(q_gh);
1055                 force_refresh = 0;
1056                 goto restart;
1057         }
1058
1059         return 0;
1060
1061 fail_gunlock:
1062         gfs2_glock_dq_uninit(&i_gh);
1063 fail:
1064         gfs2_glock_dq_uninit(q_gh);
1065         return error;
1066 }
1067
1068 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1069 {
1070         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1071         struct gfs2_quota_data *qd;
1072         u32 x;
1073         int error;
1074
1075         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1076             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1077                 return 0;
1078
1079         error = gfs2_quota_hold(ip, uid, gid);
1080         if (error)
1081                 return error;
1082
1083         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1084              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1085
1086         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1087                 qd = ip->i_qadata->qa_qd[x];
1088                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1089                 if (error)
1090                         break;
1091         }
1092
1093         if (!error)
1094                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1095         else {
1096                 while (x--)
1097                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1098                 gfs2_quota_unhold(ip);
1099         }
1100
1101         return error;
1102 }
1103
1104 static bool need_sync(struct gfs2_quota_data *qd)
1105 {
1106         struct gfs2_sbd *sdp = qd->qd_sbd;
1107         struct gfs2_tune *gt = &sdp->sd_tune;
1108         s64 value;
1109         unsigned int num, den;
1110
1111         if (!qd->qd_qb.qb_limit)
1112                 return false;
1113
1114         spin_lock(&qd_lock);
1115         value = qd->qd_change;
1116         spin_unlock(&qd_lock);
1117
1118         spin_lock(&gt->gt_spin);
1119         num = gt->gt_quota_scale_num;
1120         den = gt->gt_quota_scale_den;
1121         spin_unlock(&gt->gt_spin);
1122
1123         if (value <= 0)
1124                 return false;
1125         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1126                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1127                 return false;
1128         else {
1129                 value *= gfs2_jindex_size(sdp) * num;
1130                 value = div_s64(value, den);
1131                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1132                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1133                         return false;
1134         }
1135
1136         return true;
1137 }
1138
1139 void gfs2_quota_unlock(struct gfs2_inode *ip)
1140 {
1141         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1142         struct gfs2_quota_data *qda[2 * GFS2_MAXQUOTAS];
1143         unsigned int count = 0;
1144         u32 x;
1145         int found;
1146
1147         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1148                 return;
1149
1150         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1151                 struct gfs2_quota_data *qd;
1152                 bool sync;
1153
1154                 qd = ip->i_qadata->qa_qd[x];
1155                 sync = need_sync(qd);
1156
1157                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1158                 if (!sync)
1159                         continue;
1160
1161                 spin_lock(&qd_lock);
1162                 found = qd_check_sync(sdp, qd, NULL);
1163                 spin_unlock(&qd_lock);
1164
1165                 if (!found)
1166                         continue;
1167
1168                 if (!qd_bh_get_or_undo(sdp, qd))
1169                         qda[count++] = qd;
1170         }
1171
1172         if (count) {
1173                 do_sync(count, qda);
1174                 for (x = 0; x < count; x++)
1175                         qd_unlock(qda[x]);
1176         }
1177
1178         gfs2_quota_unhold(ip);
1179 }
1180
1181 #define MAX_LINE 256
1182
1183 static int print_message(struct gfs2_quota_data *qd, char *type)
1184 {
1185         struct gfs2_sbd *sdp = qd->qd_sbd;
1186
1187         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1188                 fs_info(sdp, "quota %s for %s %u\n",
1189                         type,
1190                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1191                         from_kqid(&init_user_ns, qd->qd_id));
1192
1193         return 0;
1194 }
1195
1196 /**
1197  * gfs2_quota_check - check if allocating new blocks will exceed quota
1198  * @ip:  The inode for which this check is being performed
1199  * @uid: The uid to check against
1200  * @gid: The gid to check against
1201  * @ap:  The allocation parameters. ap->target contains the requested
1202  *       blocks. ap->min_target, if set, contains the minimum blks
1203  *       requested.
1204  *
1205  * Returns: 0 on success.
1206  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1207  *                  quota must allow at least min_req blks for success and
1208  *                  ap->allowed is set to the number of blocks allowed
1209  *
1210  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1211  *                  of blocks available.
1212  */
1213 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1214                      struct gfs2_alloc_parms *ap)
1215 {
1216         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1217         struct gfs2_quota_data *qd;
1218         s64 value, warn, limit;
1219         u32 x;
1220         int error = 0;
1221
1222         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1223         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1224                 return 0;
1225
1226         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1227                 qd = ip->i_qadata->qa_qd[x];
1228
1229                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1230                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1231                         continue;
1232
1233                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1234                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1235                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1236                 spin_lock(&qd_lock);
1237                 value += qd->qd_change;
1238                 spin_unlock(&qd_lock);
1239
1240                 if (limit > 0 && (limit - value) < ap->allowed)
1241                         ap->allowed = limit - value;
1242                 /* If we can't meet the target */
1243                 if (limit && limit < (value + (s64)ap->target)) {
1244                         /* If no min_target specified or we don't meet
1245                          * min_target, return -EDQUOT */
1246                         if (!ap->min_target || ap->min_target > ap->allowed) {
1247                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1248                                                       &qd->qd_flags)) {
1249                                         print_message(qd, "exceeded");
1250                                         quota_send_warning(qd->qd_id,
1251                                                            sdp->sd_vfs->s_dev,
1252                                                            QUOTA_NL_BHARDWARN);
1253                                 }
1254                                 error = -EDQUOT;
1255                                 break;
1256                         }
1257                 } else if (warn && warn < value &&
1258                            time_after_eq(jiffies, qd->qd_last_warn +
1259                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1260                                          * HZ)) {
1261                         quota_send_warning(qd->qd_id,
1262                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1263                         error = print_message(qd, "warning");
1264                         qd->qd_last_warn = jiffies;
1265                 }
1266         }
1267         return error;
1268 }
1269
1270 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1271                        kuid_t uid, kgid_t gid)
1272 {
1273         struct gfs2_quota_data *qd;
1274         u32 x;
1275         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1276
1277         if ((sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1278             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) ||
1279             gfs2_assert_warn(sdp, change))
1280                 return;
1281         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1282                 return;
1283
1284         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1285                                  ip->i_qadata->qa_ref > 0))
1286                 return;
1287         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1288                 qd = ip->i_qadata->qa_qd[x];
1289
1290                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1291                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1292                         do_qc(qd, change, QC_CHANGE);
1293                 }
1294         }
1295 }
1296
1297 static bool qd_changed(struct gfs2_sbd *sdp)
1298 {
1299         struct gfs2_quota_data *qd;
1300         bool changed = false;
1301
1302         spin_lock(&qd_lock);
1303         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1304                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
1305                     !test_bit(QDF_CHANGE, &qd->qd_flags))
1306                         continue;
1307
1308                 changed = true;
1309                 break;
1310         }
1311         spin_unlock(&qd_lock);
1312         return changed;
1313 }
1314
1315 int gfs2_quota_sync(struct super_block *sb, int type)
1316 {
1317         struct gfs2_sbd *sdp = sb->s_fs_info;
1318         struct gfs2_quota_data **qda;
1319         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1320         unsigned int num_qd;
1321         unsigned int x;
1322         int error = 0;
1323
1324         if (!qd_changed(sdp))
1325                 return 0;
1326
1327         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1328         if (!qda)
1329                 return -ENOMEM;
1330
1331         mutex_lock(&sdp->sd_quota_sync_mutex);
1332         sdp->sd_quota_sync_gen++;
1333
1334         do {
1335                 num_qd = 0;
1336
1337                 for (;;) {
1338                         error = qd_fish(sdp, qda + num_qd);
1339                         if (error || !qda[num_qd])
1340                                 break;
1341                         if (++num_qd == max_qd)
1342                                 break;
1343                 }
1344
1345                 if (num_qd) {
1346                         if (!error)
1347                                 error = do_sync(num_qd, qda);
1348
1349                         for (x = 0; x < num_qd; x++)
1350                                 qd_unlock(qda[x]);
1351                 }
1352         } while (!error && num_qd == max_qd);
1353
1354         mutex_unlock(&sdp->sd_quota_sync_mutex);
1355         kfree(qda);
1356
1357         return error;
1358 }
1359
1360 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1361 {
1362         struct gfs2_quota_data *qd;
1363         struct gfs2_holder q_gh;
1364         int error;
1365
1366         error = qd_get(sdp, qid, &qd);
1367         if (error)
1368                 return error;
1369
1370         error = do_glock(qd, FORCE, &q_gh);
1371         if (!error)
1372                 gfs2_glock_dq_uninit(&q_gh);
1373
1374         qd_put(qd);
1375         return error;
1376 }
1377
1378 int gfs2_quota_init(struct gfs2_sbd *sdp)
1379 {
1380         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1381         u64 size = i_size_read(sdp->sd_qc_inode);
1382         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1383         unsigned int x, slot = 0;
1384         unsigned int found = 0;
1385         unsigned int hash;
1386         unsigned int bm_size;
1387         u64 dblock;
1388         u32 extlen = 0;
1389         int error;
1390
1391         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1392                 return -EIO;
1393
1394         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1395         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1396         bm_size *= sizeof(unsigned long);
1397         error = -ENOMEM;
1398         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1399         if (sdp->sd_quota_bitmap == NULL)
1400                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1401                                                  __GFP_ZERO);
1402         if (!sdp->sd_quota_bitmap)
1403                 return error;
1404
1405         for (x = 0; x < blocks; x++) {
1406                 struct buffer_head *bh;
1407                 const struct gfs2_quota_change *qc;
1408                 unsigned int y;
1409
1410                 if (!extlen) {
1411                         extlen = 32;
1412                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1413                         if (error)
1414                                 goto fail;
1415                 }
1416                 error = -EIO;
1417                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1418                 if (!bh)
1419                         goto fail;
1420                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1421                         brelse(bh);
1422                         goto fail;
1423                 }
1424
1425                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1426                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1427                      y++, slot++) {
1428                         struct gfs2_quota_data *qd;
1429                         s64 qc_change = be64_to_cpu(qc->qc_change);
1430                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1431                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1432                                                 USRQUOTA : GRPQUOTA;
1433                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1434                                                       be32_to_cpu(qc->qc_id));
1435                         qc++;
1436                         if (!qc_change)
1437                                 continue;
1438
1439                         hash = gfs2_qd_hash(sdp, qc_id);
1440                         qd = qd_alloc(hash, sdp, qc_id);
1441                         if (qd == NULL) {
1442                                 brelse(bh);
1443                                 goto fail;
1444                         }
1445
1446                         set_bit(QDF_CHANGE, &qd->qd_flags);
1447                         qd->qd_change = qc_change;
1448                         qd->qd_slot = slot;
1449                         qd->qd_slot_ref = 1;
1450
1451                         spin_lock(&qd_lock);
1452                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1453                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1454                         atomic_inc(&sdp->sd_quota_count);
1455                         spin_unlock(&qd_lock);
1456
1457                         spin_lock_bucket(hash);
1458                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1459                         spin_unlock_bucket(hash);
1460
1461                         found++;
1462                 }
1463
1464                 brelse(bh);
1465                 dblock++;
1466                 extlen--;
1467         }
1468
1469         if (found)
1470                 fs_info(sdp, "found %u quota changes\n", found);
1471
1472         return 0;
1473
1474 fail:
1475         gfs2_quota_cleanup(sdp);
1476         return error;
1477 }
1478
1479 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1480 {
1481         struct gfs2_quota_data *qd;
1482         LIST_HEAD(dispose);
1483         int count;
1484
1485         BUG_ON(test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1486
1487         spin_lock(&qd_lock);
1488         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1489                 spin_lock(&qd->qd_lockref.lock);
1490                 if (qd->qd_lockref.count != 0) {
1491                         spin_unlock(&qd->qd_lockref.lock);
1492                         continue;
1493                 }
1494                 lockref_mark_dead(&qd->qd_lockref);
1495                 spin_unlock(&qd->qd_lockref.lock);
1496
1497                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1498                 list_add(&qd->qd_lru, &dispose);
1499         }
1500         spin_unlock(&qd_lock);
1501
1502         gfs2_qd_list_dispose(&dispose);
1503
1504         wait_event_timeout(sdp->sd_kill_wait,
1505                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1506                 HZ * 60);
1507
1508         if (count != 0)
1509                 fs_err(sdp, "%d left-over quota data objects\n", count);
1510
1511         kvfree(sdp->sd_quota_bitmap);
1512         sdp->sd_quota_bitmap = NULL;
1513 }
1514
1515 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1516 {
1517         if (error == 0 || error == -EROFS)
1518                 return;
1519         if (!gfs2_withdrawn(sdp)) {
1520                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1521                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1522                 wake_up(&sdp->sd_logd_waitq);
1523         }
1524 }
1525
1526 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1527                                int (*fxn)(struct super_block *sb, int type),
1528                                unsigned long t, unsigned long *timeo,
1529                                unsigned int *new_timeo)
1530 {
1531         if (t >= *timeo) {
1532                 int error = fxn(sdp->sd_vfs, 0);
1533                 quotad_error(sdp, msg, error);
1534                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1535         } else {
1536                 *timeo -= t;
1537         }
1538 }
1539
1540 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1541         if (!sdp->sd_statfs_force_sync) {
1542                 sdp->sd_statfs_force_sync = 1;
1543                 wake_up(&sdp->sd_quota_wait);
1544         }
1545 }
1546
1547
1548 /**
1549  * gfs2_quotad - Write cached quota changes into the quota file
1550  * @data: Pointer to GFS2 superblock
1551  *
1552  */
1553
1554 int gfs2_quotad(void *data)
1555 {
1556         struct gfs2_sbd *sdp = data;
1557         struct gfs2_tune *tune = &sdp->sd_tune;
1558         unsigned long statfs_timeo = 0;
1559         unsigned long quotad_timeo = 0;
1560         unsigned long t = 0;
1561
1562         while (!kthread_should_stop()) {
1563                 if (gfs2_withdrawn(sdp))
1564                         break;
1565
1566                 /* Update the master statfs file */
1567                 if (sdp->sd_statfs_force_sync) {
1568                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1569                         quotad_error(sdp, "statfs", error);
1570                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1571                 }
1572                 else
1573                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1574                                            &statfs_timeo,
1575                                            &tune->gt_statfs_quantum);
1576
1577                 /* Update quota file */
1578                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1579                                    &quotad_timeo, &tune->gt_quota_quantum);
1580
1581                 try_to_freeze();
1582
1583                 t = min(quotad_timeo, statfs_timeo);
1584
1585                 t = wait_event_interruptible_timeout(sdp->sd_quota_wait,
1586                                 sdp->sd_statfs_force_sync ||
1587                                 gfs2_withdrawn(sdp) ||
1588                                 kthread_should_stop(),
1589                                 t);
1590
1591                 if (sdp->sd_statfs_force_sync)
1592                         t = 0;
1593         }
1594
1595         return 0;
1596 }
1597
1598 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1599 {
1600         struct gfs2_sbd *sdp = sb->s_fs_info;
1601
1602         memset(state, 0, sizeof(*state));
1603
1604         switch (sdp->sd_args.ar_quota) {
1605         case GFS2_QUOTA_QUIET:
1606                 fallthrough;
1607         case GFS2_QUOTA_ON:
1608                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1609                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1610                 fallthrough;
1611         case GFS2_QUOTA_ACCOUNT:
1612                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1613                                                   QCI_SYSFILE;
1614                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1615                                                   QCI_SYSFILE;
1616                 break;
1617         case GFS2_QUOTA_OFF:
1618                 break;
1619         }
1620         if (sdp->sd_quota_inode) {
1621                 state->s_state[USRQUOTA].ino =
1622                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1623                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1624         }
1625         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1626         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1627         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1628         return 0;
1629 }
1630
1631 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1632                           struct qc_dqblk *fdq)
1633 {
1634         struct gfs2_sbd *sdp = sb->s_fs_info;
1635         struct gfs2_quota_lvb *qlvb;
1636         struct gfs2_quota_data *qd;
1637         struct gfs2_holder q_gh;
1638         int error;
1639
1640         memset(fdq, 0, sizeof(*fdq));
1641
1642         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1643                 return -ESRCH; /* Crazy XFS error code */
1644
1645         if ((qid.type != USRQUOTA) &&
1646             (qid.type != GRPQUOTA))
1647                 return -EINVAL;
1648
1649         error = qd_get(sdp, qid, &qd);
1650         if (error)
1651                 return error;
1652         error = do_glock(qd, FORCE, &q_gh);
1653         if (error)
1654                 goto out;
1655
1656         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1657         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1658         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1659         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1660
1661         gfs2_glock_dq_uninit(&q_gh);
1662 out:
1663         qd_put(qd);
1664         return error;
1665 }
1666
1667 /* GFS2 only supports a subset of the XFS fields */
1668 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1669
1670 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1671                           struct qc_dqblk *fdq)
1672 {
1673         struct gfs2_sbd *sdp = sb->s_fs_info;
1674         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1675         struct gfs2_quota_data *qd;
1676         struct gfs2_holder q_gh, i_gh;
1677         unsigned int data_blocks, ind_blocks;
1678         unsigned int blocks = 0;
1679         int alloc_required;
1680         loff_t offset;
1681         int error;
1682
1683         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1684                 return -ESRCH; /* Crazy XFS error code */
1685
1686         if ((qid.type != USRQUOTA) &&
1687             (qid.type != GRPQUOTA))
1688                 return -EINVAL;
1689
1690         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1691                 return -EINVAL;
1692
1693         error = qd_get(sdp, qid, &qd);
1694         if (error)
1695                 return error;
1696
1697         error = gfs2_qa_get(ip);
1698         if (error)
1699                 goto out_put;
1700
1701         inode_lock(&ip->i_inode);
1702         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1703         if (error)
1704                 goto out_unlockput;
1705         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1706         if (error)
1707                 goto out_q;
1708
1709         /* Check for existing entry, if none then alloc new blocks */
1710         error = update_qd(sdp, qd);
1711         if (error)
1712                 goto out_i;
1713
1714         /* If nothing has changed, this is a no-op */
1715         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1716             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1717                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1718
1719         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1720             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1721                 fdq->d_fieldmask ^= QC_SPC_HARD;
1722
1723         if ((fdq->d_fieldmask & QC_SPACE) &&
1724             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1725                 fdq->d_fieldmask ^= QC_SPACE;
1726
1727         if (fdq->d_fieldmask == 0)
1728                 goto out_i;
1729
1730         offset = qd2offset(qd);
1731         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1732         if (gfs2_is_stuffed(ip))
1733                 alloc_required = 1;
1734         if (alloc_required) {
1735                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1736                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1737                                        &data_blocks, &ind_blocks);
1738                 blocks = 1 + data_blocks + ind_blocks;
1739                 ap.target = blocks;
1740                 error = gfs2_inplace_reserve(ip, &ap);
1741                 if (error)
1742                         goto out_i;
1743                 blocks += gfs2_rg_blocks(ip, blocks);
1744         }
1745
1746         /* Some quotas span block boundaries and can update two blocks,
1747            adding an extra block to the transaction to handle such quotas */
1748         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1749         if (error)
1750                 goto out_release;
1751
1752         /* Apply changes */
1753         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1754         if (!error)
1755                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1756
1757         gfs2_trans_end(sdp);
1758 out_release:
1759         if (alloc_required)
1760                 gfs2_inplace_release(ip);
1761 out_i:
1762         gfs2_glock_dq_uninit(&i_gh);
1763 out_q:
1764         gfs2_glock_dq_uninit(&q_gh);
1765 out_unlockput:
1766         gfs2_qa_put(ip);
1767         inode_unlock(&ip->i_inode);
1768 out_put:
1769         qd_put(qd);
1770         return error;
1771 }
1772
1773 const struct quotactl_ops gfs2_quotactl_ops = {
1774         .quota_sync     = gfs2_quota_sync,
1775         .get_state      = gfs2_quota_get_state,
1776         .get_dqblk      = gfs2_get_dqblk,
1777         .set_dqblk      = gfs2_set_dqblk,
1778 };
1779
1780 void __init gfs2_quota_hash_init(void)
1781 {
1782         unsigned i;
1783
1784         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1785                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1786 }