fs/gfs2/quota.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 /*
   8  * Quota change tags are associated with each transaction that allocates or
   9  * deallocates space.  Those changes are accumulated locally to each node (in a
  10  * per-node file) and then are periodically synced to the quota file.  This
  11  * avoids the bottleneck of constantly touching the quota file, but introduces
  12  * fuzziness in the current usage value of IDs that are being used on different
  13  * nodes in the cluster simultaneously.  So, it is possible for a user on
  14  * multiple nodes to overrun their quota, but that overrun is controlable.
  15  * Since quota tags are part of transactions, there is no need for a quota check
  16  * program to be run on node crashes or anything like that.
  17  *
  18  * There are couple of knobs that let the administrator manage the quota
  19  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  20  * sitting on one node before being synced to the quota file.  (The default is
  21  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  22  * of quota file syncs increases as the user moves closer to their limit.  The
  23  * more frequent the syncs, the more accurate the quota enforcement, but that
  24  * means that there is more contention between the nodes for the quota file.
  25  * The default value is one.  This sets the maximum theoretical quota overrun
  26  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  27  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  28  * number greater than one makes quota syncs more frequent and reduces the
  29  * maximum overrun.  Numbers less than one (but greater than zero) make quota
  30  * syncs less frequent.
  31  *
  32  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  33  * the quota file, so it is not being constantly read.
  34  */
  35
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37
  38 #include <linux/sched.h>
  39 #include <linux/slab.h>
  40 #include <linux/mm.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/completion.h>
  43 #include <linux/buffer_head.h>
  44 #include <linux/sort.h>
  45 #include <linux/fs.h>
  46 #include <linux/bio.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <linux/kthread.h>
  49 #include <linux/freezer.h>
  50 #include <linux/quota.h>
  51 #include <linux/dqblk_xfs.h>
  52 #include <linux/lockref.h>
  53 #include <linux/list_lru.h>
  54 #include <linux/rcupdate.h>
  55 #include <linux/rculist_bl.h>
  56 #include <linux/bit_spinlock.h>
  57 #include <linux/jhash.h>
  58 #include <linux/vmalloc.h>
  59
  60 #include "gfs2.h"
  61 #include "incore.h"
  62 #include "bmap.h"
  63 #include "glock.h"
  64 #include "glops.h"
  65 #include "log.h"
  66 #include "meta_io.h"
  67 #include "quota.h"
  68 #include "rgrp.h"
  69 #include "super.h"
  70 #include "trans.h"
  71 #include "inode.h"
  72 #include "util.h"
  73
  74 #define GFS2_QD_HASH_SHIFT      12
  75 #define GFS2_QD_HASH_SIZE       BIT(GFS2_QD_HASH_SHIFT)
  76 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
  77
  78 #define QC_CHANGE 0
  79 #define QC_SYNC 1
  80
  81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
  82 /*                     -> sd_bitmap_lock                              */
  83 static DEFINE_SPINLOCK(qd_lock);
  84 struct list_lru gfs2_qd_lru;
  85
  86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
  87
  88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
  89                                  const struct kqid qid)
  90 {
  91         unsigned int h;
  92
  93         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
  94         h = jhash(&qid, sizeof(struct kqid), h);
  95
  96         return h & GFS2_QD_HASH_MASK;
  97 }
  98
  99 static inline void spin_lock_bucket(unsigned int hash)
 100 {
 101         hlist_bl_lock(&qd_hash_table[hash]);
 102 }
 103
 104 static inline void spin_unlock_bucket(unsigned int hash)
 105 {
 106         hlist_bl_unlock(&qd_hash_table[hash]);
 107 }
 108
 109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 110 {
 111         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
 112         struct gfs2_sbd *sdp = qd->qd_sbd;
 113
 114         kmem_cache_free(gfs2_quotad_cachep, qd);
 115         if (atomic_dec_and_test(&sdp->sd_quota_count))
 116                 wake_up(&sdp->sd_kill_wait);
 117 }
 118
 119 static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
 120 {
 121         struct gfs2_sbd *sdp = qd->qd_sbd;
 122
 123         spin_lock(&qd_lock);
 124         list_del(&qd->qd_list);
 125         spin_unlock(&qd_lock);
 126
 127         spin_lock_bucket(qd->qd_hash);
 128         hlist_bl_del_rcu(&qd->qd_hlist);
 129         spin_unlock_bucket(qd->qd_hash);
 130
 131         if (!gfs2_withdrawn(sdp)) {
 132                 gfs2_assert_warn(sdp, !qd->qd_change);
 133                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 134                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 135         }
 136
 137         gfs2_glock_put(qd->qd_gl);
 138         call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 139 }
 140
 141 static void gfs2_qd_list_dispose(struct list_head *list)
 142 {
 143         struct gfs2_quota_data *qd;
 144
 145         while (!list_empty(list)) {
 146                 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
 147                 list_del(&qd->qd_lru);
 148
 149                 gfs2_qd_dispose(qd);
 150         }
 151 }
 152
 153
 154 static enum lru_status gfs2_qd_isolate(struct list_head *item,
 155                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
 156 {
 157         struct list_head *dispose = arg;
 158         struct gfs2_quota_data *qd =
 159                 list_entry(item, struct gfs2_quota_data, qd_lru);
 160         enum lru_status status;
 161
 162         if (!spin_trylock(&qd->qd_lockref.lock))
 163                 return LRU_SKIP;
 164
 165         status = LRU_SKIP;
 166         if (qd->qd_lockref.count == 0) {
 167                 lockref_mark_dead(&qd->qd_lockref);
 168                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
 169                 status = LRU_REMOVED;
 170         }
 171
 172         spin_unlock(&qd->qd_lockref.lock);
 173         return status;
 174 }
 175
 176 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 177                                          struct shrink_control *sc)
 178 {
 179         LIST_HEAD(dispose);
 180         unsigned long freed;
 181
 182         if (!(sc->gfp_mask & __GFP_FS))
 183                 return SHRINK_STOP;
 184
 185         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 186                                      gfs2_qd_isolate, &dispose);
 187
 188         gfs2_qd_list_dispose(&dispose);
 189
 190         return freed;
 191 }
 192
 193 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 194                                           struct shrink_control *sc)
 195 {
 196         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 197 }
 198
 199 struct shrinker gfs2_qd_shrinker = {
 200         .count_objects = gfs2_qd_shrink_count,
 201         .scan_objects = gfs2_qd_shrink_scan,
 202         .seeks = DEFAULT_SEEKS,
 203         .flags = SHRINKER_NUMA_AWARE,
 204 };
 205
 206
 207 static u64 qd2index(struct gfs2_quota_data *qd)
 208 {
 209         struct kqid qid = qd->qd_id;
 210         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 211                 ((qid.type == USRQUOTA) ? 0 : 1);
 212 }
 213
 214 static u64 qd2offset(struct gfs2_quota_data *qd)
 215 {
 216         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_count == 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_count++;
 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_count);
 367         qd->qd_slot_count++;
 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_count);
 377         if (!--qd->qd_slot_count) {
 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->i_atime = current_time(inode);
 890                 mark_inode_dirty(inode);
 891                 set_bit(QDF_REFRESH, &qd->qd_flags);
 892         }
 893
 894         return err;
 895 }
 896
 897 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 898 {
 899         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
 900         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 901         struct gfs2_alloc_parms ap = { .aflags = 0, };
 902         unsigned int data_blocks, ind_blocks;
 903         struct gfs2_holder *ghs, i_gh;
 904         unsigned int qx, x;
 905         struct gfs2_quota_data *qd;
 906         unsigned reserved;
 907         loff_t offset;
 908         unsigned int nalloc = 0, blocks;
 909         int error;
 910
 911         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         error = 0;
 975
 976 out_end_trans:
 977         gfs2_trans_end(sdp);
 978 out_ipres:
 979         gfs2_inplace_release(ip);
 980 out_alloc:
 981         gfs2_glock_dq_uninit(&i_gh);
 982 out_dq:
 983         while (qx--)
 984                 gfs2_glock_dq_uninit(&ghs[qx]);
 985         inode_unlock(&ip->i_inode);
 986         kfree(ghs);
 987         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 988                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 989         if (!error) {
 990                 for (x = 0; x < num_qd; x++)
 991                         qda[x]->qd_sync_gen = sdp->sd_quota_sync_gen;
 992         }
 993         return error;
 994 }
 995
 996 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 997 {
 998         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 999         struct gfs2_quota q;
1000         struct gfs2_quota_lvb *qlvb;
1001         loff_t pos;
1002         int error;
1003
1004         memset(&q, 0, sizeof(struct gfs2_quota));
1005         pos = qd2offset(qd);
1006         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1007         if (error < 0)
1008                 return error;
1009
1010         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1011         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1012         qlvb->__pad = 0;
1013         qlvb->qb_limit = q.qu_limit;
1014         qlvb->qb_warn = q.qu_warn;
1015         qlvb->qb_value = q.qu_value;
1016         qd->qd_qb = *qlvb;
1017
1018         return 0;
1019 }
1020
1021 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1022                     struct gfs2_holder *q_gh)
1023 {
1024         struct gfs2_sbd *sdp = qd->qd_sbd;
1025         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1026         struct gfs2_holder i_gh;
1027         int error;
1028
1029         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1030 restart:
1031         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1032         if (error)
1033                 return error;
1034
1035         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1036                 force_refresh = FORCE;
1037
1038         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1039
1040         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1041                 gfs2_glock_dq_uninit(q_gh);
1042                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1043                                            GL_NOCACHE, q_gh);
1044                 if (error)
1045                         return error;
1046
1047                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1048                 if (error)
1049                         goto fail;
1050
1051                 error = update_qd(sdp, qd);
1052                 if (error)
1053                         goto fail_gunlock;
1054
1055                 gfs2_glock_dq_uninit(&i_gh);
1056                 gfs2_glock_dq_uninit(q_gh);
1057                 force_refresh = 0;
1058                 goto restart;
1059         }
1060
1061         return 0;
1062
1063 fail_gunlock:
1064         gfs2_glock_dq_uninit(&i_gh);
1065 fail:
1066         gfs2_glock_dq_uninit(q_gh);
1067         return error;
1068 }
1069
1070 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1071 {
1072         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1073         struct gfs2_quota_data *qd;
1074         u32 x;
1075         int error;
1076
1077         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1078             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1079                 return 0;
1080
1081         error = gfs2_quota_hold(ip, uid, gid);
1082         if (error)
1083                 return error;
1084
1085         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1086              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1087
1088         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1089                 qd = ip->i_qadata->qa_qd[x];
1090                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1091                 if (error)
1092                         break;
1093         }
1094
1095         if (!error)
1096                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1097         else {
1098                 while (x--)
1099                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1100                 gfs2_quota_unhold(ip);
1101         }
1102
1103         return error;
1104 }
1105
1106 static bool need_sync(struct gfs2_quota_data *qd)
1107 {
1108         struct gfs2_sbd *sdp = qd->qd_sbd;
1109         struct gfs2_tune *gt = &sdp->sd_tune;
1110         s64 value;
1111         unsigned int num, den;
1112
1113         if (!qd->qd_qb.qb_limit)
1114                 return false;
1115
1116         spin_lock(&qd_lock);
1117         value = qd->qd_change;
1118         spin_unlock(&qd_lock);
1119
1120         spin_lock(&gt->gt_spin);
1121         num = gt->gt_quota_scale_num;
1122         den = gt->gt_quota_scale_den;
1123         spin_unlock(&gt->gt_spin);
1124
1125         if (value <= 0)
1126                 return false;
1127         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1128                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1129                 return false;
1130         else {
1131                 value *= gfs2_jindex_size(sdp) * num;
1132                 value = div_s64(value, den);
1133                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1134                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1135                         return false;
1136         }
1137
1138         return true;
1139 }
1140
1141 void gfs2_quota_unlock(struct gfs2_inode *ip)
1142 {
1143         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1144         struct gfs2_quota_data *qda[2 * GFS2_MAXQUOTAS];
1145         unsigned int count = 0;
1146         u32 x;
1147         int found;
1148
1149         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1150                 return;
1151
1152         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1153                 struct gfs2_quota_data *qd;
1154                 bool sync;
1155
1156                 qd = ip->i_qadata->qa_qd[x];
1157                 sync = need_sync(qd);
1158
1159                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1160                 if (!sync)
1161                         continue;
1162
1163                 spin_lock(&qd_lock);
1164                 found = qd_check_sync(sdp, qd, NULL);
1165                 spin_unlock(&qd_lock);
1166
1167                 if (!found)
1168                         continue;
1169
1170                 if (!qd_bh_get_or_undo(sdp, qd))
1171                         qda[count++] = qd;
1172         }
1173
1174         if (count) {
1175                 do_sync(count, qda);
1176                 for (x = 0; x < count; x++)
1177                         qd_unlock(qda[x]);
1178         }
1179
1180         gfs2_quota_unhold(ip);
1181 }
1182
1183 #define MAX_LINE 256
1184
1185 static int print_message(struct gfs2_quota_data *qd, char *type)
1186 {
1187         struct gfs2_sbd *sdp = qd->qd_sbd;
1188
1189         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET)
1190                 fs_info(sdp, "quota %s for %s %u\n",
1191                         type,
1192                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1193                         from_kqid(&init_user_ns, qd->qd_id));
1194
1195         return 0;
1196 }
1197
1198 /**
1199  * gfs2_quota_check - check if allocating new blocks will exceed quota
1200  * @ip:  The inode for which this check is being performed
1201  * @uid: The uid to check against
1202  * @gid: The gid to check against
1203  * @ap:  The allocation parameters. ap->target contains the requested
1204  *       blocks. ap->min_target, if set, contains the minimum blks
1205  *       requested.
1206  *
1207  * Returns: 0 on success.
1208  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1209  *                  quota must allow at least min_req blks for success and
1210  *                  ap->allowed is set to the number of blocks allowed
1211  *
1212  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1213  *                  of blocks available.
1214  */
1215 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1216                      struct gfs2_alloc_parms *ap)
1217 {
1218         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1219         struct gfs2_quota_data *qd;
1220         s64 value, warn, limit;
1221         u32 x;
1222         int error = 0;
1223
1224         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1225         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1226                 return 0;
1227
1228         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1229                 qd = ip->i_qadata->qa_qd[x];
1230
1231                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1232                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1233                         continue;
1234
1235                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1236                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1237                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1238                 spin_lock(&qd_lock);
1239                 value += qd->qd_change;
1240                 spin_unlock(&qd_lock);
1241
1242                 if (limit > 0 && (limit - value) < ap->allowed)
1243                         ap->allowed = limit - value;
1244                 /* If we can't meet the target */
1245                 if (limit && limit < (value + (s64)ap->target)) {
1246                         /* If no min_target specified or we don't meet
1247                          * min_target, return -EDQUOT */
1248                         if (!ap->min_target || ap->min_target > ap->allowed) {
1249                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1250                                                       &qd->qd_flags)) {
1251                                         print_message(qd, "exceeded");
1252                                         quota_send_warning(qd->qd_id,
1253                                                            sdp->sd_vfs->s_dev,
1254                                                            QUOTA_NL_BHARDWARN);
1255                                 }
1256                                 error = -EDQUOT;
1257                                 break;
1258                         }
1259                 } else if (warn && warn < value &&
1260                            time_after_eq(jiffies, qd->qd_last_warn +
1261                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1262                                          * HZ)) {
1263                         quota_send_warning(qd->qd_id,
1264                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1265                         error = print_message(qd, "warning");
1266                         qd->qd_last_warn = jiffies;
1267                 }
1268         }
1269         return error;
1270 }
1271
1272 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1273                        kuid_t uid, kgid_t gid)
1274 {
1275         struct gfs2_quota_data *qd;
1276         u32 x;
1277         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1278
1279         if ((sdp->sd_args.ar_quota != GFS2_QUOTA_ON &&
1280             sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) ||
1281             gfs2_assert_warn(sdp, change))
1282                 return;
1283         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1284                 return;
1285
1286         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1287                                  ip->i_qadata->qa_ref > 0))
1288                 return;
1289         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1290                 qd = ip->i_qadata->qa_qd[x];
1291
1292                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1293                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1294                         do_qc(qd, change, QC_CHANGE);
1295                 }
1296         }
1297 }
1298
1299 int gfs2_quota_sync(struct super_block *sb, int type)
1300 {
1301         struct gfs2_sbd *sdp = sb->s_fs_info;
1302         struct gfs2_quota_data **qda;
1303         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1304         unsigned int num_qd;
1305         unsigned int x;
1306         int error = 0;
1307
1308         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1309         if (!qda)
1310                 return -ENOMEM;
1311
1312         mutex_lock(&sdp->sd_quota_sync_mutex);
1313         sdp->sd_quota_sync_gen++;
1314
1315         do {
1316                 num_qd = 0;
1317
1318                 for (;;) {
1319                         error = qd_fish(sdp, qda + num_qd);
1320                         if (error || !qda[num_qd])
1321                                 break;
1322                         if (++num_qd == max_qd)
1323                                 break;
1324                 }
1325
1326                 if (num_qd) {
1327                         if (!error)
1328                                 error = do_sync(num_qd, qda);
1329
1330                         for (x = 0; x < num_qd; x++)
1331                                 qd_unlock(qda[x]);
1332                 }
1333         } while (!error && num_qd == max_qd);
1334
1335         mutex_unlock(&sdp->sd_quota_sync_mutex);
1336         kfree(qda);
1337
1338         return error;
1339 }
1340
1341 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1342 {
1343         struct gfs2_quota_data *qd;
1344         struct gfs2_holder q_gh;
1345         int error;
1346
1347         error = qd_get(sdp, qid, &qd);
1348         if (error)
1349                 return error;
1350
1351         error = do_glock(qd, FORCE, &q_gh);
1352         if (!error)
1353                 gfs2_glock_dq_uninit(&q_gh);
1354
1355         qd_put(qd);
1356         return error;
1357 }
1358
1359 int gfs2_quota_init(struct gfs2_sbd *sdp)
1360 {
1361         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1362         u64 size = i_size_read(sdp->sd_qc_inode);
1363         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1364         unsigned int x, slot = 0;
1365         unsigned int found = 0;
1366         unsigned int hash;
1367         unsigned int bm_size;
1368         u64 dblock;
1369         u32 extlen = 0;
1370         int error;
1371
1372         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1373                 return -EIO;
1374
1375         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1376         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1377         bm_size *= sizeof(unsigned long);
1378         error = -ENOMEM;
1379         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1380         if (sdp->sd_quota_bitmap == NULL)
1381                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1382                                                  __GFP_ZERO);
1383         if (!sdp->sd_quota_bitmap)
1384                 return error;
1385
1386         for (x = 0; x < blocks; x++) {
1387                 struct buffer_head *bh;
1388                 const struct gfs2_quota_change *qc;
1389                 unsigned int y;
1390
1391                 if (!extlen) {
1392                         extlen = 32;
1393                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1394                         if (error)
1395                                 goto fail;
1396                 }
1397                 error = -EIO;
1398                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1399                 if (!bh)
1400                         goto fail;
1401                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1402                         brelse(bh);
1403                         goto fail;
1404                 }
1405
1406                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1407                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1408                      y++, slot++) {
1409                         struct gfs2_quota_data *qd;
1410                         s64 qc_change = be64_to_cpu(qc->qc_change);
1411                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1412                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1413                                                 USRQUOTA : GRPQUOTA;
1414                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1415                                                       be32_to_cpu(qc->qc_id));
1416                         qc++;
1417                         if (!qc_change)
1418                                 continue;
1419
1420                         hash = gfs2_qd_hash(sdp, qc_id);
1421                         qd = qd_alloc(hash, sdp, qc_id);
1422                         if (qd == NULL) {
1423                                 brelse(bh);
1424                                 goto fail;
1425                         }
1426
1427                         set_bit(QDF_CHANGE, &qd->qd_flags);
1428                         qd->qd_change = qc_change;
1429                         qd->qd_slot = slot;
1430                         qd->qd_slot_count = 1;
1431
1432                         spin_lock(&qd_lock);
1433                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1434                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1435                         atomic_inc(&sdp->sd_quota_count);
1436                         spin_unlock(&qd_lock);
1437
1438                         spin_lock_bucket(hash);
1439                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1440                         spin_unlock_bucket(hash);
1441
1442                         found++;
1443                 }
1444
1445                 brelse(bh);
1446                 dblock++;
1447                 extlen--;
1448         }
1449
1450         if (found)
1451                 fs_info(sdp, "found %u quota changes\n", found);
1452
1453         return 0;
1454
1455 fail:
1456         gfs2_quota_cleanup(sdp);
1457         return error;
1458 }
1459
1460 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1461 {
1462         struct gfs2_quota_data *qd;
1463         LIST_HEAD(dispose);
1464         int count;
1465
1466         BUG_ON(test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1467
1468         spin_lock(&qd_lock);
1469         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1470                 spin_lock(&qd->qd_lockref.lock);
1471                 if (qd->qd_lockref.count != 0) {
1472                         spin_unlock(&qd->qd_lockref.lock);
1473                         continue;
1474                 }
1475                 lockref_mark_dead(&qd->qd_lockref);
1476                 spin_unlock(&qd->qd_lockref.lock);
1477
1478                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1479                 list_add(&qd->qd_lru, &dispose);
1480         }
1481         spin_unlock(&qd_lock);
1482
1483         gfs2_qd_list_dispose(&dispose);
1484
1485         wait_event_timeout(sdp->sd_kill_wait,
1486                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1487                 HZ * 60);
1488
1489         if (count != 0)
1490                 fs_err(sdp, "%d left-over quota data objects\n", count);
1491
1492         kvfree(sdp->sd_quota_bitmap);
1493         sdp->sd_quota_bitmap = NULL;
1494 }
1495
1496 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1497 {
1498         if (error == 0 || error == -EROFS)
1499                 return;
1500         if (!gfs2_withdrawn(sdp)) {
1501                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1502                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1503                 wake_up(&sdp->sd_logd_waitq);
1504         }
1505 }
1506
1507 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1508                                int (*fxn)(struct super_block *sb, int type),
1509                                unsigned long t, unsigned long *timeo,
1510                                unsigned int *new_timeo)
1511 {
1512         if (t >= *timeo) {
1513                 int error = fxn(sdp->sd_vfs, 0);
1514                 quotad_error(sdp, msg, error);
1515                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1516         } else {
1517                 *timeo -= t;
1518         }
1519 }
1520
1521 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1522         if (!sdp->sd_statfs_force_sync) {
1523                 sdp->sd_statfs_force_sync = 1;
1524                 wake_up(&sdp->sd_quota_wait);
1525         }
1526 }
1527
1528
1529 /**
1530  * gfs2_quotad - Write cached quota changes into the quota file
1531  * @data: Pointer to GFS2 superblock
1532  *
1533  */
1534
1535 int gfs2_quotad(void *data)
1536 {
1537         struct gfs2_sbd *sdp = data;
1538         struct gfs2_tune *tune = &sdp->sd_tune;
1539         unsigned long statfs_timeo = 0;
1540         unsigned long quotad_timeo = 0;
1541         unsigned long t = 0;
1542
1543         while (!kthread_should_stop()) {
1544                 if (gfs2_withdrawn(sdp))
1545                         break;
1546
1547                 /* Update the master statfs file */
1548                 if (sdp->sd_statfs_force_sync) {
1549                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1550                         quotad_error(sdp, "statfs", error);
1551                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1552                 }
1553                 else
1554                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1555                                            &statfs_timeo,
1556                                            &tune->gt_statfs_quantum);
1557
1558                 /* Update quota file */
1559                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1560                                    &quotad_timeo, &tune->gt_quota_quantum);
1561
1562                 try_to_freeze();
1563
1564                 t = min(quotad_timeo, statfs_timeo);
1565
1566                 t = wait_event_interruptible_timeout(sdp->sd_quota_wait,
1567                                 sdp->sd_statfs_force_sync ||
1568                                 gfs2_withdrawn(sdp) ||
1569                                 kthread_should_stop(),
1570                                 t);
1571
1572                 if (sdp->sd_statfs_force_sync)
1573                         t = 0;
1574         }
1575
1576         return 0;
1577 }
1578
1579 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1580 {
1581         struct gfs2_sbd *sdp = sb->s_fs_info;
1582
1583         memset(state, 0, sizeof(*state));
1584
1585         switch (sdp->sd_args.ar_quota) {
1586         case GFS2_QUOTA_QUIET:
1587                 fallthrough;
1588         case GFS2_QUOTA_ON:
1589                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1590                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1591                 fallthrough;
1592         case GFS2_QUOTA_ACCOUNT:
1593                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1594                                                   QCI_SYSFILE;
1595                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1596                                                   QCI_SYSFILE;
1597                 break;
1598         case GFS2_QUOTA_OFF:
1599                 break;
1600         }
1601         if (sdp->sd_quota_inode) {
1602                 state->s_state[USRQUOTA].ino =
1603                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1604                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1605         }
1606         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1607         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1608         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1609         return 0;
1610 }
1611
1612 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1613                           struct qc_dqblk *fdq)
1614 {
1615         struct gfs2_sbd *sdp = sb->s_fs_info;
1616         struct gfs2_quota_lvb *qlvb;
1617         struct gfs2_quota_data *qd;
1618         struct gfs2_holder q_gh;
1619         int error;
1620
1621         memset(fdq, 0, sizeof(*fdq));
1622
1623         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1624                 return -ESRCH; /* Crazy XFS error code */
1625
1626         if ((qid.type != USRQUOTA) &&
1627             (qid.type != GRPQUOTA))
1628                 return -EINVAL;
1629
1630         error = qd_get(sdp, qid, &qd);
1631         if (error)
1632                 return error;
1633         error = do_glock(qd, FORCE, &q_gh);
1634         if (error)
1635                 goto out;
1636
1637         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1638         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1639         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1640         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1641
1642         gfs2_glock_dq_uninit(&q_gh);
1643 out:
1644         qd_put(qd);
1645         return error;
1646 }
1647
1648 /* GFS2 only supports a subset of the XFS fields */
1649 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1650
1651 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1652                           struct qc_dqblk *fdq)
1653 {
1654         struct gfs2_sbd *sdp = sb->s_fs_info;
1655         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1656         struct gfs2_quota_data *qd;
1657         struct gfs2_holder q_gh, i_gh;
1658         unsigned int data_blocks, ind_blocks;
1659         unsigned int blocks = 0;
1660         int alloc_required;
1661         loff_t offset;
1662         int error;
1663
1664         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1665                 return -ESRCH; /* Crazy XFS error code */
1666
1667         if ((qid.type != USRQUOTA) &&
1668             (qid.type != GRPQUOTA))
1669                 return -EINVAL;
1670
1671         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1672                 return -EINVAL;
1673
1674         error = qd_get(sdp, qid, &qd);
1675         if (error)
1676                 return error;
1677
1678         error = gfs2_qa_get(ip);
1679         if (error)
1680                 goto out_put;
1681
1682         inode_lock(&ip->i_inode);
1683         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1684         if (error)
1685                 goto out_unlockput;
1686         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1687         if (error)
1688                 goto out_q;
1689
1690         /* Check for existing entry, if none then alloc new blocks */
1691         error = update_qd(sdp, qd);
1692         if (error)
1693                 goto out_i;
1694
1695         /* If nothing has changed, this is a no-op */
1696         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1697             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1698                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1699
1700         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1701             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1702                 fdq->d_fieldmask ^= QC_SPC_HARD;
1703
1704         if ((fdq->d_fieldmask & QC_SPACE) &&
1705             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1706                 fdq->d_fieldmask ^= QC_SPACE;
1707
1708         if (fdq->d_fieldmask == 0)
1709                 goto out_i;
1710
1711         offset = qd2offset(qd);
1712         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1713         if (gfs2_is_stuffed(ip))
1714                 alloc_required = 1;
1715         if (alloc_required) {
1716                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1717                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1718                                        &data_blocks, &ind_blocks);
1719                 blocks = 1 + data_blocks + ind_blocks;
1720                 ap.target = blocks;
1721                 error = gfs2_inplace_reserve(ip, &ap);
1722                 if (error)
1723                         goto out_i;
1724                 blocks += gfs2_rg_blocks(ip, blocks);
1725         }
1726
1727         /* Some quotas span block boundaries and can update two blocks,
1728            adding an extra block to the transaction to handle such quotas */
1729         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1730         if (error)
1731                 goto out_release;
1732
1733         /* Apply changes */
1734         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1735         if (!error)
1736                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1737
1738         gfs2_trans_end(sdp);
1739 out_release:
1740         if (alloc_required)
1741                 gfs2_inplace_release(ip);
1742 out_i:
1743         gfs2_glock_dq_uninit(&i_gh);
1744 out_q:
1745         gfs2_glock_dq_uninit(&q_gh);
1746 out_unlockput:
1747         gfs2_qa_put(ip);
1748         inode_unlock(&ip->i_inode);
1749 out_put:
1750         qd_put(qd);
1751         return error;
1752 }
1753
1754 const struct quotactl_ops gfs2_quotactl_ops = {
1755         .quota_sync     = gfs2_quota_sync,
1756         .get_state      = gfs2_quota_get_state,
1757         .get_dqblk      = gfs2_get_dqblk,
1758         .set_dqblk      = gfs2_set_dqblk,
1759 };
1760
1761 void __init gfs2_quota_hash_init(void)
1762 {
1763         unsigned i;
1764
1765         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1766                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1767 }