fs/gfs2/quota.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 /*
  11  * Quota change tags are associated with each transaction that allocates or
  12  * deallocates space.  Those changes are accumulated locally to each node (in a
  13  * per-node file) and then are periodically synced to the quota file.  This
  14  * avoids the bottleneck of constantly touching the quota file, but introduces
  15  * fuzziness in the current usage value of IDs that are being used on different
  16  * nodes in the cluster simultaneously.  So, it is possible for a user on
  17  * multiple nodes to overrun their quota, but that overrun is controlable.
  18  * Since quota tags are part of transactions, there is no need for a quota check
  19  * program to be run on node crashes or anything like that.
  20  *
  21  * There are couple of knobs that let the administrator manage the quota
  22  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  23  * sitting on one node before being synced to the quota file.  (The default is
  24  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  25  * of quota file syncs increases as the user moves closer to their limit.  The
  26  * more frequent the syncs, the more accurate the quota enforcement, but that
  27  * means that there is more contention between the nodes for the quota file.
  28  * The default value is one.  This sets the maximum theoretical quota overrun
  29  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  30  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  31  * number greater than one makes quota syncs more frequent and reduces the
  32  * maximum overrun.  Numbers less than one (but greater than zero) make quota
  33  * syncs less frequent.
  34  *
  35  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  36  * the quota file, so it is not being constantly read.
  37  */
  38
  39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  40
  41 #include <linux/sched.h>
  42 #include <linux/slab.h>
  43 #include <linux/mm.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/completion.h>
  46 #include <linux/buffer_head.h>
  47 #include <linux/sort.h>
  48 #include <linux/fs.h>
  49 #include <linux/bio.h>
  50 #include <linux/gfs2_ondisk.h>
  51 #include <linux/kthread.h>
  52 #include <linux/freezer.h>
  53 #include <linux/quota.h>
  54 #include <linux/dqblk_xfs.h>
  55 #include <linux/lockref.h>
  56 #include <linux/list_lru.h>
  57 #include <linux/rcupdate.h>
  58 #include <linux/rculist_bl.h>
  59 #include <linux/bit_spinlock.h>
  60 #include <linux/jhash.h>
  61 #include <linux/vmalloc.h>
  62
  63 #include "gfs2.h"
  64 #include "incore.h"
  65 #include "bmap.h"
  66 #include "glock.h"
  67 #include "glops.h"
  68 #include "log.h"
  69 #include "meta_io.h"
  70 #include "quota.h"
  71 #include "rgrp.h"
  72 #include "super.h"
  73 #include "trans.h"
  74 #include "inode.h"
  75 #include "util.h"
  76
  77 #define GFS2_QD_HASH_SHIFT      12
  78 #define GFS2_QD_HASH_SIZE       (1 << GFS2_QD_HASH_SHIFT)
  79 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
  80
  81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
  82 /*                     -> sd_bitmap_lock                              */
  83 static DEFINE_SPINLOCK(qd_lock);
  84 struct list_lru gfs2_qd_lru;
  85
  86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
  87
  88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
  89                                  const struct kqid qid)
  90 {
  91         unsigned int h;
  92
  93         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
  94         h = jhash(&qid, sizeof(struct kqid), h);
  95
  96         return h & GFS2_QD_HASH_MASK;
  97 }
  98
  99 static inline void spin_lock_bucket(unsigned int hash)
 100 {
 101         hlist_bl_lock(&qd_hash_table[hash]);
 102 }
 103
 104 static inline void spin_unlock_bucket(unsigned int hash)
 105 {
 106         hlist_bl_unlock(&qd_hash_table[hash]);
 107 }
 108
 109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 110 {
 111         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
 112         kmem_cache_free(gfs2_quotad_cachep, qd);
 113 }
 114
 115 static void gfs2_qd_dispose(struct list_head *list)
 116 {
 117         struct gfs2_quota_data *qd;
 118         struct gfs2_sbd *sdp;
 119
 120         while (!list_empty(list)) {
 121                 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
 122                 sdp = qd->qd_gl->gl_sbd;
 123
 124                 list_del(&qd->qd_lru);
 125
 126                 /* Free from the filesystem-specific list */
 127                 spin_lock(&qd_lock);
 128                 list_del(&qd->qd_list);
 129                 spin_unlock(&qd_lock);
 130
 131                 spin_lock_bucket(qd->qd_hash);
 132                 hlist_bl_del_rcu(&qd->qd_hlist);
 133                 spin_unlock_bucket(qd->qd_hash);
 134
 135                 gfs2_assert_warn(sdp, !qd->qd_change);
 136                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 137                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 138
 139                 gfs2_glock_put(qd->qd_gl);
 140                 atomic_dec(&sdp->sd_quota_count);
 141
 142                 /* Delete it from the common reclaim list */
 143                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 144         }
 145 }
 146
 147
 148 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
 149 {
 150         struct list_head *dispose = arg;
 151         struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
 152
 153         if (!spin_trylock(&qd->qd_lockref.lock))
 154                 return LRU_SKIP;
 155
 156         if (qd->qd_lockref.count == 0) {
 157                 lockref_mark_dead(&qd->qd_lockref);
 158                 list_move(&qd->qd_lru, dispose);
 159         }
 160
 161         spin_unlock(&qd->qd_lockref.lock);
 162         return LRU_REMOVED;
 163 }
 164
 165 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 166                                          struct shrink_control *sc)
 167 {
 168         LIST_HEAD(dispose);
 169         unsigned long freed;
 170
 171         if (!(sc->gfp_mask & __GFP_FS))
 172                 return SHRINK_STOP;
 173
 174         freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
 175                                    &dispose, &sc->nr_to_scan);
 176
 177         gfs2_qd_dispose(&dispose);
 178
 179         return freed;
 180 }
 181
 182 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 183                                           struct shrink_control *sc)
 184 {
 185         return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
 186 }
 187
 188 struct shrinker gfs2_qd_shrinker = {
 189         .count_objects = gfs2_qd_shrink_count,
 190         .scan_objects = gfs2_qd_shrink_scan,
 191         .seeks = DEFAULT_SEEKS,
 192         .flags = SHRINKER_NUMA_AWARE,
 193 };
 194
 195
 196 static u64 qd2index(struct gfs2_quota_data *qd)
 197 {
 198         struct kqid qid = qd->qd_id;
 199         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 200                 ((qid.type == USRQUOTA) ? 0 : 1);
 201 }
 202
 203 static u64 qd2offset(struct gfs2_quota_data *qd)
 204 {
 205         u64 offset;
 206
 207         offset = qd2index(qd);
 208         offset *= sizeof(struct gfs2_quota);
 209
 210         return offset;
 211 }
 212
 213 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 214 {
 215         struct gfs2_quota_data *qd;
 216         int error;
 217
 218         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 219         if (!qd)
 220                 return NULL;
 221
 222         qd->qd_sbd = sdp;
 223         qd->qd_lockref.count = 1;
 224         spin_lock_init(&qd->qd_lockref.lock);
 225         qd->qd_id = qid;
 226         qd->qd_slot = -1;
 227         INIT_LIST_HEAD(&qd->qd_lru);
 228         qd->qd_hash = hash;
 229
 230         error = gfs2_glock_get(sdp, qd2index(qd),
 231                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 232         if (error)
 233                 goto fail;
 234
 235         return qd;
 236
 237 fail:
 238         kmem_cache_free(gfs2_quotad_cachep, qd);
 239         return NULL;
 240 }
 241
 242 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 243                                                      const struct gfs2_sbd *sdp,
 244                                                      struct kqid qid)
 245 {
 246         struct gfs2_quota_data *qd;
 247         struct hlist_bl_node *h;
 248
 249         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 250                 if (!qid_eq(qd->qd_id, qid))
 251                         continue;
 252                 if (qd->qd_sbd != sdp)
 253                         continue;
 254                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 255                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 256                         return qd;
 257                 }
 258         }
 259
 260         return NULL;
 261 }
 262
 263
 264 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 265                   struct gfs2_quota_data **qdp)
 266 {
 267         struct gfs2_quota_data *qd, *new_qd;
 268         unsigned int hash = gfs2_qd_hash(sdp, qid);
 269
 270         rcu_read_lock();
 271         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 272         rcu_read_unlock();
 273
 274         if (qd)
 275                 return 0;
 276
 277         new_qd = qd_alloc(hash, sdp, qid);
 278         if (!new_qd)
 279                 return -ENOMEM;
 280
 281         spin_lock(&qd_lock);
 282         spin_lock_bucket(hash);
 283         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 284         if (qd == NULL) {
 285                 *qdp = new_qd;
 286                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 287                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 288                 atomic_inc(&sdp->sd_quota_count);
 289         }
 290         spin_unlock_bucket(hash);
 291         spin_unlock(&qd_lock);
 292
 293         if (qd) {
 294                 gfs2_glock_put(new_qd->qd_gl);
 295                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 296         }
 297
 298         return 0;
 299 }
 300
 301
 302 static void qd_hold(struct gfs2_quota_data *qd)
 303 {
 304         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 305         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 306         lockref_get(&qd->qd_lockref);
 307 }
 308
 309 static void qd_put(struct gfs2_quota_data *qd)
 310 {
 311         if (lockref_put_or_lock(&qd->qd_lockref))
 312                 return;
 313
 314         qd->qd_lockref.count = 0;
 315         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 316         spin_unlock(&qd->qd_lockref.lock);
 317
 318 }
 319
 320 static int slot_get(struct gfs2_quota_data *qd)
 321 {
 322         struct gfs2_sbd *sdp = qd->qd_sbd;
 323         unsigned int bit;
 324         int error = 0;
 325
 326         spin_lock(&sdp->sd_bitmap_lock);
 327         if (qd->qd_slot_count != 0)
 328                 goto out;
 329
 330         error = -ENOSPC;
 331         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
 332         if (bit < sdp->sd_quota_slots) {
 333                 set_bit(bit, sdp->sd_quota_bitmap);
 334                 qd->qd_slot = bit;
 335 out:
 336                 qd->qd_slot_count++;
 337         }
 338         spin_unlock(&sdp->sd_bitmap_lock);
 339
 340         return error;
 341 }
 342
 343 static void slot_hold(struct gfs2_quota_data *qd)
 344 {
 345         struct gfs2_sbd *sdp = qd->qd_sbd;
 346
 347         spin_lock(&sdp->sd_bitmap_lock);
 348         gfs2_assert(sdp, qd->qd_slot_count);
 349         qd->qd_slot_count++;
 350         spin_unlock(&sdp->sd_bitmap_lock);
 351 }
 352
 353 static void slot_put(struct gfs2_quota_data *qd)
 354 {
 355         struct gfs2_sbd *sdp = qd->qd_sbd;
 356
 357         spin_lock(&sdp->sd_bitmap_lock);
 358         gfs2_assert(sdp, qd->qd_slot_count);
 359         if (!--qd->qd_slot_count) {
 360                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 361                 qd->qd_slot = -1;
 362         }
 363         spin_unlock(&sdp->sd_bitmap_lock);
 364 }
 365
 366 static int bh_get(struct gfs2_quota_data *qd)
 367 {
 368         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 369         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 370         unsigned int block, offset;
 371         struct buffer_head *bh;
 372         int error;
 373         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 374
 375         mutex_lock(&sdp->sd_quota_mutex);
 376
 377         if (qd->qd_bh_count++) {
 378                 mutex_unlock(&sdp->sd_quota_mutex);
 379                 return 0;
 380         }
 381
 382         block = qd->qd_slot / sdp->sd_qc_per_block;
 383         offset = qd->qd_slot % sdp->sd_qc_per_block;
 384
 385         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 386         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 387         if (error)
 388                 goto fail;
 389         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 390         if (error)
 391                 goto fail;
 392         error = -EIO;
 393         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 394                 goto fail_brelse;
 395
 396         qd->qd_bh = bh;
 397         qd->qd_bh_qc = (struct gfs2_quota_change *)
 398                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 399                  offset * sizeof(struct gfs2_quota_change));
 400
 401         mutex_unlock(&sdp->sd_quota_mutex);
 402
 403         return 0;
 404
 405 fail_brelse:
 406         brelse(bh);
 407 fail:
 408         qd->qd_bh_count--;
 409         mutex_unlock(&sdp->sd_quota_mutex);
 410         return error;
 411 }
 412
 413 static void bh_put(struct gfs2_quota_data *qd)
 414 {
 415         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 416
 417         mutex_lock(&sdp->sd_quota_mutex);
 418         gfs2_assert(sdp, qd->qd_bh_count);
 419         if (!--qd->qd_bh_count) {
 420                 brelse(qd->qd_bh);
 421                 qd->qd_bh = NULL;
 422                 qd->qd_bh_qc = NULL;
 423         }
 424         mutex_unlock(&sdp->sd_quota_mutex);
 425 }
 426
 427 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 428                          u64 *sync_gen)
 429 {
 430         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 431             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 432             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 433                 return 0;
 434
 435         if (!lockref_get_not_dead(&qd->qd_lockref))
 436                 return 0;
 437
 438         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 439         set_bit(QDF_LOCKED, &qd->qd_flags);
 440         qd->qd_change_sync = qd->qd_change;
 441         slot_hold(qd);
 442         return 1;
 443 }
 444
 445 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 446 {
 447         struct gfs2_quota_data *qd = NULL;
 448         int error;
 449         int found = 0;
 450
 451         *qdp = NULL;
 452
 453         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 454                 return 0;
 455
 456         spin_lock(&qd_lock);
 457
 458         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 459                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
 460                 if (found)
 461                         break;
 462         }
 463
 464         if (!found)
 465                 qd = NULL;
 466
 467         spin_unlock(&qd_lock);
 468
 469         if (qd) {
 470                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 471                 error = bh_get(qd);
 472                 if (error) {
 473                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 474                         slot_put(qd);
 475                         qd_put(qd);
 476                         return error;
 477                 }
 478         }
 479
 480         *qdp = qd;
 481
 482         return 0;
 483 }
 484
 485 static void qd_unlock(struct gfs2_quota_data *qd)
 486 {
 487         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 488                          test_bit(QDF_LOCKED, &qd->qd_flags));
 489         clear_bit(QDF_LOCKED, &qd->qd_flags);
 490         bh_put(qd);
 491         slot_put(qd);
 492         qd_put(qd);
 493 }
 494
 495 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 496                     struct gfs2_quota_data **qdp)
 497 {
 498         int error;
 499
 500         error = qd_get(sdp, qid, qdp);
 501         if (error)
 502                 return error;
 503
 504         error = slot_get(*qdp);
 505         if (error)
 506                 goto fail;
 507
 508         error = bh_get(*qdp);
 509         if (error)
 510                 goto fail_slot;
 511
 512         return 0;
 513
 514 fail_slot:
 515         slot_put(*qdp);
 516 fail:
 517         qd_put(*qdp);
 518         return error;
 519 }
 520
 521 static void qdsb_put(struct gfs2_quota_data *qd)
 522 {
 523         bh_put(qd);
 524         slot_put(qd);
 525         qd_put(qd);
 526 }
 527
 528 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 529 {
 530         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 531         struct gfs2_quota_data **qd;
 532         int error;
 533
 534         if (ip->i_res == NULL) {
 535                 error = gfs2_rs_alloc(ip);
 536                 if (error)
 537                         return error;
 538         }
 539
 540         qd = ip->i_res->rs_qa_qd;
 541
 542         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 543             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 544                 return -EIO;
 545
 546         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 547                 return 0;
 548
 549         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 550         if (error)
 551                 goto out;
 552         ip->i_res->rs_qa_qd_num++;
 553         qd++;
 554
 555         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 556         if (error)
 557                 goto out;
 558         ip->i_res->rs_qa_qd_num++;
 559         qd++;
 560
 561         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 562             !uid_eq(uid, ip->i_inode.i_uid)) {
 563                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 564                 if (error)
 565                         goto out;
 566                 ip->i_res->rs_qa_qd_num++;
 567                 qd++;
 568         }
 569
 570         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 571             !gid_eq(gid, ip->i_inode.i_gid)) {
 572                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 573                 if (error)
 574                         goto out;
 575                 ip->i_res->rs_qa_qd_num++;
 576                 qd++;
 577         }
 578
 579 out:
 580         if (error)
 581                 gfs2_quota_unhold(ip);
 582         return error;
 583 }
 584
 585 void gfs2_quota_unhold(struct gfs2_inode *ip)
 586 {
 587         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 588         unsigned int x;
 589
 590         if (ip->i_res == NULL)
 591                 return;
 592         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 593
 594         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 595                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 596                 ip->i_res->rs_qa_qd[x] = NULL;
 597         }
 598         ip->i_res->rs_qa_qd_num = 0;
 599 }
 600
 601 static int sort_qd(const void *a, const void *b)
 602 {
 603         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 604         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 605
 606         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 607                 return -1;
 608         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 609                 return 1;
 610         return 0;
 611 }
 612
 613 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 614 {
 615         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 616         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 617         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 618         s64 x;
 619
 620         mutex_lock(&sdp->sd_quota_mutex);
 621         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 622
 623         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 624                 qc->qc_change = 0;
 625                 qc->qc_flags = 0;
 626                 if (qd->qd_id.type == USRQUOTA)
 627                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 628                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 629         }
 630
 631         x = be64_to_cpu(qc->qc_change) + change;
 632         qc->qc_change = cpu_to_be64(x);
 633
 634         spin_lock(&qd_lock);
 635         qd->qd_change = x;
 636         spin_unlock(&qd_lock);
 637
 638         if (!x) {
 639                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 640                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 641                 qc->qc_flags = 0;
 642                 qc->qc_id = 0;
 643                 slot_put(qd);
 644                 qd_put(qd);
 645         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 646                 qd_hold(qd);
 647                 slot_hold(qd);
 648         }
 649
 650         mutex_unlock(&sdp->sd_quota_mutex);
 651 }
 652
 653 /**
 654  * gfs2_adjust_quota - adjust record of current block usage
 655  * @ip: The quota inode
 656  * @loc: Offset of the entry in the quota file
 657  * @change: The amount of usage change to record
 658  * @qd: The quota data
 659  * @fdq: The updated limits to record
 660  *
 661  * This function was mostly borrowed from gfs2_block_truncate_page which was
 662  * in turn mostly borrowed from ext3
 663  *
 664  * Returns: 0 or -ve on error
 665  */
 666
 667 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 668                              s64 change, struct gfs2_quota_data *qd,
 669                              struct fs_disk_quota *fdq)
 670 {
 671         struct inode *inode = &ip->i_inode;
 672         struct gfs2_sbd *sdp = GFS2_SB(inode);
 673         struct address_space *mapping = inode->i_mapping;
 674         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 675         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 676         unsigned blocksize, iblock, pos;
 677         struct buffer_head *bh;
 678         struct page *page;
 679         void *kaddr, *ptr;
 680         struct gfs2_quota q;
 681         int err, nbytes;
 682         u64 size;
 683
 684         if (gfs2_is_stuffed(ip)) {
 685                 err = gfs2_unstuff_dinode(ip, NULL);
 686                 if (err)
 687                         return err;
 688         }
 689
 690         memset(&q, 0, sizeof(struct gfs2_quota));
 691         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 692         if (err < 0)
 693                 return err;
 694
 695         err = -EIO;
 696         be64_add_cpu(&q.qu_value, change);
 697         qd->qd_qb.qb_value = q.qu_value;
 698         if (fdq) {
 699                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 700                         q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 701                         qd->qd_qb.qb_warn = q.qu_warn;
 702                 }
 703                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 704                         q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 705                         qd->qd_qb.qb_limit = q.qu_limit;
 706                 }
 707                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 708                         q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 709                         qd->qd_qb.qb_value = q.qu_value;
 710                 }
 711         }
 712
 713         /* Write the quota into the quota file on disk */
 714         ptr = &q;
 715         nbytes = sizeof(struct gfs2_quota);
 716 get_a_page:
 717         page = find_or_create_page(mapping, index, GFP_NOFS);
 718         if (!page)
 719                 return -ENOMEM;
 720
 721         blocksize = inode->i_sb->s_blocksize;
 722         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 723
 724         if (!page_has_buffers(page))
 725                 create_empty_buffers(page, blocksize, 0);
 726
 727         bh = page_buffers(page);
 728         pos = blocksize;
 729         while (offset >= pos) {
 730                 bh = bh->b_this_page;
 731                 iblock++;
 732                 pos += blocksize;
 733         }
 734
 735         if (!buffer_mapped(bh)) {
 736                 gfs2_block_map(inode, iblock, bh, 1);
 737                 if (!buffer_mapped(bh))
 738                         goto unlock_out;
 739                 /* If it's a newly allocated disk block for quota, zero it */
 740                 if (buffer_new(bh))
 741                         zero_user(page, pos - blocksize, bh->b_size);
 742         }
 743
 744         if (PageUptodate(page))
 745                 set_buffer_uptodate(bh);
 746
 747         if (!buffer_uptodate(bh)) {
 748                 ll_rw_block(READ | REQ_META, 1, &bh);
 749                 wait_on_buffer(bh);
 750                 if (!buffer_uptodate(bh))
 751                         goto unlock_out;
 752         }
 753
 754         gfs2_trans_add_data(ip->i_gl, bh);
 755
 756         kaddr = kmap_atomic(page);
 757         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 758                 nbytes = PAGE_CACHE_SIZE - offset;
 759         memcpy(kaddr + offset, ptr, nbytes);
 760         flush_dcache_page(page);
 761         kunmap_atomic(kaddr);
 762         unlock_page(page);
 763         page_cache_release(page);
 764
 765         /* If quota straddles page boundary, we need to update the rest of the
 766          * quota at the beginning of the next page */
 767         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 768                 ptr = ptr + nbytes;
 769                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 770                 offset = 0;
 771                 index++;
 772                 goto get_a_page;
 773         }
 774
 775         size = loc + sizeof(struct gfs2_quota);
 776         if (size > inode->i_size)
 777                 i_size_write(inode, size);
 778         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 779         mark_inode_dirty(inode);
 780         return 0;
 781
 782 unlock_out:
 783         unlock_page(page);
 784         page_cache_release(page);
 785         return err;
 786 }
 787
 788 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 789 {
 790         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 791         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 792         struct gfs2_alloc_parms ap = { .aflags = 0, };
 793         unsigned int data_blocks, ind_blocks;
 794         struct gfs2_holder *ghs, i_gh;
 795         unsigned int qx, x;
 796         struct gfs2_quota_data *qd;
 797         unsigned reserved;
 798         loff_t offset;
 799         unsigned int nalloc = 0, blocks;
 800         int error;
 801
 802         error = gfs2_rs_alloc(ip);
 803         if (error)
 804                 return error;
 805
 806         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 807                               &data_blocks, &ind_blocks);
 808
 809         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 810         if (!ghs)
 811                 return -ENOMEM;
 812
 813         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 814         mutex_lock(&ip->i_inode.i_mutex);
 815         for (qx = 0; qx < num_qd; qx++) {
 816                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 817                                            GL_NOCACHE, &ghs[qx]);
 818                 if (error)
 819                         goto out;
 820         }
 821
 822         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 823         if (error)
 824                 goto out;
 825
 826         for (x = 0; x < num_qd; x++) {
 827                 offset = qd2offset(qda[x]);
 828                 if (gfs2_write_alloc_required(ip, offset,
 829                                               sizeof(struct gfs2_quota)))
 830                         nalloc++;
 831         }
 832
 833         /*
 834          * 1 blk for unstuffing inode if stuffed. We add this extra
 835          * block to the reservation unconditionally. If the inode
 836          * doesn't need unstuffing, the block will be released to the
 837          * rgrp since it won't be allocated during the transaction
 838          */
 839         /* +3 in the end for unstuffing block, inode size update block
 840          * and another block in case quota straddles page boundary and
 841          * two blocks need to be updated instead of 1 */
 842         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 843
 844         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 845         ap.target = reserved;
 846         error = gfs2_inplace_reserve(ip, &ap);
 847         if (error)
 848                 goto out_alloc;
 849
 850         if (nalloc)
 851                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 852
 853         error = gfs2_trans_begin(sdp, blocks, 0);
 854         if (error)
 855                 goto out_ipres;
 856
 857         for (x = 0; x < num_qd; x++) {
 858                 qd = qda[x];
 859                 offset = qd2offset(qd);
 860                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 861                 if (error)
 862                         goto out_end_trans;
 863
 864                 do_qc(qd, -qd->qd_change_sync);
 865                 set_bit(QDF_REFRESH, &qd->qd_flags);
 866         }
 867
 868         error = 0;
 869
 870 out_end_trans:
 871         gfs2_trans_end(sdp);
 872 out_ipres:
 873         gfs2_inplace_release(ip);
 874 out_alloc:
 875         gfs2_glock_dq_uninit(&i_gh);
 876 out:
 877         while (qx--)
 878                 gfs2_glock_dq_uninit(&ghs[qx]);
 879         mutex_unlock(&ip->i_inode.i_mutex);
 880         kfree(ghs);
 881         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 882         return error;
 883 }
 884
 885 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 886 {
 887         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 888         struct gfs2_quota q;
 889         struct gfs2_quota_lvb *qlvb;
 890         loff_t pos;
 891         int error;
 892
 893         memset(&q, 0, sizeof(struct gfs2_quota));
 894         pos = qd2offset(qd);
 895         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 896         if (error < 0)
 897                 return error;
 898
 899         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 900         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 901         qlvb->__pad = 0;
 902         qlvb->qb_limit = q.qu_limit;
 903         qlvb->qb_warn = q.qu_warn;
 904         qlvb->qb_value = q.qu_value;
 905         qd->qd_qb = *qlvb;
 906
 907         return 0;
 908 }
 909
 910 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 911                     struct gfs2_holder *q_gh)
 912 {
 913         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 914         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 915         struct gfs2_holder i_gh;
 916         int error;
 917
 918 restart:
 919         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 920         if (error)
 921                 return error;
 922
 923         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 924
 925         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 926                 gfs2_glock_dq_uninit(q_gh);
 927                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 928                                            GL_NOCACHE, q_gh);
 929                 if (error)
 930                         return error;
 931
 932                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 933                 if (error)
 934                         goto fail;
 935
 936                 error = update_qd(sdp, qd);
 937                 if (error)
 938                         goto fail_gunlock;
 939
 940                 gfs2_glock_dq_uninit(&i_gh);
 941                 gfs2_glock_dq_uninit(q_gh);
 942                 force_refresh = 0;
 943                 goto restart;
 944         }
 945
 946         return 0;
 947
 948 fail_gunlock:
 949         gfs2_glock_dq_uninit(&i_gh);
 950 fail:
 951         gfs2_glock_dq_uninit(q_gh);
 952         return error;
 953 }
 954
 955 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 956 {
 957         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 958         struct gfs2_quota_data *qd;
 959         unsigned int x;
 960         int error = 0;
 961
 962         error = gfs2_quota_hold(ip, uid, gid);
 963         if (error)
 964                 return error;
 965
 966         if (capable(CAP_SYS_RESOURCE) ||
 967             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 968                 return 0;
 969
 970         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 971              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 972
 973         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 974                 int force = NO_FORCE;
 975                 qd = ip->i_res->rs_qa_qd[x];
 976                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 977                         force = FORCE;
 978                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 979                 if (error)
 980                         break;
 981         }
 982
 983         if (!error)
 984                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 985         else {
 986                 while (x--)
 987                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 988                 gfs2_quota_unhold(ip);
 989         }
 990
 991         return error;
 992 }
 993
 994 static int need_sync(struct gfs2_quota_data *qd)
 995 {
 996         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 997         struct gfs2_tune *gt = &sdp->sd_tune;
 998         s64 value;
 999         unsigned int num, den;
1000         int do_sync = 1;
1001
1002         if (!qd->qd_qb.qb_limit)
1003                 return 0;
1004
1005         spin_lock(&qd_lock);
1006         value = qd->qd_change;
1007         spin_unlock(&qd_lock);
1008
1009         spin_lock(&gt->gt_spin);
1010         num = gt->gt_quota_scale_num;
1011         den = gt->gt_quota_scale_den;
1012         spin_unlock(&gt->gt_spin);
1013
1014         if (value < 0)
1015                 do_sync = 0;
1016         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1017                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1018                 do_sync = 0;
1019         else {
1020                 value *= gfs2_jindex_size(sdp) * num;
1021                 value = div_s64(value, den);
1022                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1023                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1024                         do_sync = 0;
1025         }
1026
1027         return do_sync;
1028 }
1029
1030 void gfs2_quota_unlock(struct gfs2_inode *ip)
1031 {
1032         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1033         struct gfs2_quota_data *qda[4];
1034         unsigned int count = 0;
1035         unsigned int x;
1036         int found;
1037
1038         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1039                 goto out;
1040
1041         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1042                 struct gfs2_quota_data *qd;
1043                 int sync;
1044
1045                 qd = ip->i_res->rs_qa_qd[x];
1046                 sync = need_sync(qd);
1047
1048                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1049                 if (!sync)
1050                         continue;
1051
1052                 spin_lock(&qd_lock);
1053                 found = qd_check_sync(sdp, qd, NULL);
1054                 spin_unlock(&qd_lock);
1055
1056                 if (!found)
1057                         continue;
1058
1059                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1060                 if (bh_get(qd)) {
1061                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1062                         slot_put(qd);
1063                         qd_put(qd);
1064                         continue;
1065                 }
1066
1067                 qda[count++] = qd;
1068         }
1069
1070         if (count) {
1071                 do_sync(count, qda);
1072                 for (x = 0; x < count; x++)
1073                         qd_unlock(qda[x]);
1074         }
1075
1076 out:
1077         gfs2_quota_unhold(ip);
1078 }
1079
1080 #define MAX_LINE 256
1081
1082 static int print_message(struct gfs2_quota_data *qd, char *type)
1083 {
1084         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1085
1086         pr_info("fsid=%s: quota %s for %s %u\n",
1087                 sdp->sd_fsname, type,
1088                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1089                 from_kqid(&init_user_ns, qd->qd_id));
1090
1091         return 0;
1092 }
1093
1094 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1095 {
1096         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1097         struct gfs2_quota_data *qd;
1098         s64 value;
1099         unsigned int x;
1100         int error = 0;
1101
1102         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1103                 return 0;
1104
1105         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1106                 return 0;
1107
1108         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1109                 qd = ip->i_res->rs_qa_qd[x];
1110
1111                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1112                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1113                         continue;
1114
1115                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1116                 spin_lock(&qd_lock);
1117                 value += qd->qd_change;
1118                 spin_unlock(&qd_lock);
1119
1120                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1121                         print_message(qd, "exceeded");
1122                         quota_send_warning(qd->qd_id,
1123                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1124
1125                         error = -EDQUOT;
1126                         break;
1127                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1128                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1129                            time_after_eq(jiffies, qd->qd_last_warn +
1130                                          gfs2_tune_get(sdp,
1131                                                 gt_quota_warn_period) * HZ)) {
1132                         quota_send_warning(qd->qd_id,
1133                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1134                         error = print_message(qd, "warning");
1135                         qd->qd_last_warn = jiffies;
1136                 }
1137         }
1138
1139         return error;
1140 }
1141
1142 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1143                        kuid_t uid, kgid_t gid)
1144 {
1145         struct gfs2_quota_data *qd;
1146         unsigned int x;
1147
1148         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1149                 return;
1150         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1151                 return;
1152
1153         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1154                 qd = ip->i_res->rs_qa_qd[x];
1155
1156                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1157                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1158                         do_qc(qd, change);
1159                 }
1160         }
1161 }
1162
1163 int gfs2_quota_sync(struct super_block *sb, int type)
1164 {
1165         struct gfs2_sbd *sdp = sb->s_fs_info;
1166         struct gfs2_quota_data **qda;
1167         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1168         unsigned int num_qd;
1169         unsigned int x;
1170         int error = 0;
1171
1172         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1173         if (!qda)
1174                 return -ENOMEM;
1175
1176         mutex_lock(&sdp->sd_quota_sync_mutex);
1177         sdp->sd_quota_sync_gen++;
1178
1179         do {
1180                 num_qd = 0;
1181
1182                 for (;;) {
1183                         error = qd_fish(sdp, qda + num_qd);
1184                         if (error || !qda[num_qd])
1185                                 break;
1186                         if (++num_qd == max_qd)
1187                                 break;
1188                 }
1189
1190                 if (num_qd) {
1191                         if (!error)
1192                                 error = do_sync(num_qd, qda);
1193                         if (!error)
1194                                 for (x = 0; x < num_qd; x++)
1195                                         qda[x]->qd_sync_gen =
1196                                                 sdp->sd_quota_sync_gen;
1197
1198                         for (x = 0; x < num_qd; x++)
1199                                 qd_unlock(qda[x]);
1200                 }
1201         } while (!error && num_qd == max_qd);
1202
1203         mutex_unlock(&sdp->sd_quota_sync_mutex);
1204         kfree(qda);
1205
1206         return error;
1207 }
1208
1209 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1210 {
1211         struct gfs2_quota_data *qd;
1212         struct gfs2_holder q_gh;
1213         int error;
1214
1215         error = qd_get(sdp, qid, &qd);
1216         if (error)
1217                 return error;
1218
1219         error = do_glock(qd, FORCE, &q_gh);
1220         if (!error)
1221                 gfs2_glock_dq_uninit(&q_gh);
1222
1223         qd_put(qd);
1224         return error;
1225 }
1226
1227 int gfs2_quota_init(struct gfs2_sbd *sdp)
1228 {
1229         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1230         u64 size = i_size_read(sdp->sd_qc_inode);
1231         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1232         unsigned int x, slot = 0;
1233         unsigned int found = 0;
1234         unsigned int hash;
1235         unsigned int bm_size;
1236         u64 dblock;
1237         u32 extlen = 0;
1238         int error;
1239
1240         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1241                 return -EIO;
1242
1243         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1244         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1245         bm_size *= sizeof(unsigned long);
1246         error = -ENOMEM;
1247         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1248         if (sdp->sd_quota_bitmap == NULL)
1249                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1250                                                  __GFP_ZERO, PAGE_KERNEL);
1251         if (!sdp->sd_quota_bitmap)
1252                 return error;
1253
1254         for (x = 0; x < blocks; x++) {
1255                 struct buffer_head *bh;
1256                 const struct gfs2_quota_change *qc;
1257                 unsigned int y;
1258
1259                 if (!extlen) {
1260                         int new = 0;
1261                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1262                         if (error)
1263                                 goto fail;
1264                 }
1265                 error = -EIO;
1266                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1267                 if (!bh)
1268                         goto fail;
1269                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1270                         brelse(bh);
1271                         goto fail;
1272                 }
1273
1274                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1275                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1276                      y++, slot++) {
1277                         struct gfs2_quota_data *qd;
1278                         s64 qc_change = be64_to_cpu(qc->qc_change);
1279                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1280                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1281                                                 USRQUOTA : GRPQUOTA;
1282                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1283                                                       be32_to_cpu(qc->qc_id));
1284                         qc++;
1285                         if (!qc_change)
1286                                 continue;
1287
1288                         hash = gfs2_qd_hash(sdp, qc_id);
1289                         qd = qd_alloc(hash, sdp, qc_id);
1290                         if (qd == NULL) {
1291                                 brelse(bh);
1292                                 goto fail;
1293                         }
1294
1295                         set_bit(QDF_CHANGE, &qd->qd_flags);
1296                         qd->qd_change = qc_change;
1297                         qd->qd_slot = slot;
1298                         qd->qd_slot_count = 1;
1299
1300                         spin_lock(&qd_lock);
1301                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1302                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1303                         atomic_inc(&sdp->sd_quota_count);
1304                         spin_unlock(&qd_lock);
1305
1306                         spin_lock_bucket(hash);
1307                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1308                         spin_unlock_bucket(hash);
1309
1310                         found++;
1311                 }
1312
1313                 brelse(bh);
1314                 dblock++;
1315                 extlen--;
1316         }
1317
1318         if (found)
1319                 fs_info(sdp, "found %u quota changes\n", found);
1320
1321         return 0;
1322
1323 fail:
1324         gfs2_quota_cleanup(sdp);
1325         return error;
1326 }
1327
1328 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1329 {
1330         struct list_head *head = &sdp->sd_quota_list;
1331         struct gfs2_quota_data *qd;
1332
1333         spin_lock(&qd_lock);
1334         while (!list_empty(head)) {
1335                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1336
1337                 list_del(&qd->qd_list);
1338
1339                 /* Also remove if this qd exists in the reclaim list */
1340                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1341                 atomic_dec(&sdp->sd_quota_count);
1342                 spin_unlock(&qd_lock);
1343
1344                 spin_lock_bucket(qd->qd_hash);
1345                 hlist_bl_del_rcu(&qd->qd_hlist);
1346                 spin_unlock_bucket(qd->qd_hash);
1347
1348                 gfs2_assert_warn(sdp, !qd->qd_change);
1349                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1350                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1351
1352                 gfs2_glock_put(qd->qd_gl);
1353                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1354
1355                 spin_lock(&qd_lock);
1356         }
1357         spin_unlock(&qd_lock);
1358
1359         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1360
1361         if (sdp->sd_quota_bitmap) {
1362                 if (is_vmalloc_addr(sdp->sd_quota_bitmap))
1363                         vfree(sdp->sd_quota_bitmap);
1364                 else
1365                         kfree(sdp->sd_quota_bitmap);
1366                 sdp->sd_quota_bitmap = NULL;
1367         }
1368 }
1369
1370 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1371 {
1372         if (error == 0 || error == -EROFS)
1373                 return;
1374         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1375                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1376 }
1377
1378 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1379                                int (*fxn)(struct super_block *sb, int type),
1380                                unsigned long t, unsigned long *timeo,
1381                                unsigned int *new_timeo)
1382 {
1383         if (t >= *timeo) {
1384                 int error = fxn(sdp->sd_vfs, 0);
1385                 quotad_error(sdp, msg, error);
1386                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1387         } else {
1388                 *timeo -= t;
1389         }
1390 }
1391
1392 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1393 {
1394         struct gfs2_inode *ip;
1395
1396         while(1) {
1397                 ip = NULL;
1398                 spin_lock(&sdp->sd_trunc_lock);
1399                 if (!list_empty(&sdp->sd_trunc_list)) {
1400                         ip = list_entry(sdp->sd_trunc_list.next,
1401                                         struct gfs2_inode, i_trunc_list);
1402                         list_del_init(&ip->i_trunc_list);
1403                 }
1404                 spin_unlock(&sdp->sd_trunc_lock);
1405                 if (ip == NULL)
1406                         return;
1407                 gfs2_glock_finish_truncate(ip);
1408         }
1409 }
1410
1411 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1412         if (!sdp->sd_statfs_force_sync) {
1413                 sdp->sd_statfs_force_sync = 1;
1414                 wake_up(&sdp->sd_quota_wait);
1415         }
1416 }
1417
1418
1419 /**
1420  * gfs2_quotad - Write cached quota changes into the quota file
1421  * @sdp: Pointer to GFS2 superblock
1422  *
1423  */
1424
1425 int gfs2_quotad(void *data)
1426 {
1427         struct gfs2_sbd *sdp = data;
1428         struct gfs2_tune *tune = &sdp->sd_tune;
1429         unsigned long statfs_timeo = 0;
1430         unsigned long quotad_timeo = 0;
1431         unsigned long t = 0;
1432         DEFINE_WAIT(wait);
1433         int empty;
1434
1435         while (!kthread_should_stop()) {
1436
1437                 /* Update the master statfs file */
1438                 if (sdp->sd_statfs_force_sync) {
1439                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1440                         quotad_error(sdp, "statfs", error);
1441                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1442                 }
1443                 else
1444                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1445                                            &statfs_timeo,
1446                                            &tune->gt_statfs_quantum);
1447
1448                 /* Update quota file */
1449                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1450                                    &quotad_timeo, &tune->gt_quota_quantum);
1451
1452                 /* Check for & recover partially truncated inodes */
1453                 quotad_check_trunc_list(sdp);
1454
1455                 try_to_freeze();
1456
1457                 t = min(quotad_timeo, statfs_timeo);
1458
1459                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1460                 spin_lock(&sdp->sd_trunc_lock);
1461                 empty = list_empty(&sdp->sd_trunc_list);
1462                 spin_unlock(&sdp->sd_trunc_lock);
1463                 if (empty && !sdp->sd_statfs_force_sync)
1464                         t -= schedule_timeout(t);
1465                 else
1466                         t = 0;
1467                 finish_wait(&sdp->sd_quota_wait, &wait);
1468         }
1469
1470         return 0;
1471 }
1472
1473 static int gfs2_quota_get_xstate(struct super_block *sb,
1474                                  struct fs_quota_stat *fqs)
1475 {
1476         struct gfs2_sbd *sdp = sb->s_fs_info;
1477
1478         memset(fqs, 0, sizeof(struct fs_quota_stat));
1479         fqs->qs_version = FS_QSTAT_VERSION;
1480
1481         switch (sdp->sd_args.ar_quota) {
1482         case GFS2_QUOTA_ON:
1483                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1484                 /*FALLTHRU*/
1485         case GFS2_QUOTA_ACCOUNT:
1486                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1487                 break;
1488         case GFS2_QUOTA_OFF:
1489                 break;
1490         }
1491
1492         if (sdp->sd_quota_inode) {
1493                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1494                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1495         }
1496         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1497         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1498         fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1499         return 0;
1500 }
1501
1502 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1503                           struct fs_disk_quota *fdq)
1504 {
1505         struct gfs2_sbd *sdp = sb->s_fs_info;
1506         struct gfs2_quota_lvb *qlvb;
1507         struct gfs2_quota_data *qd;
1508         struct gfs2_holder q_gh;
1509         int error;
1510
1511         memset(fdq, 0, sizeof(struct fs_disk_quota));
1512
1513         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1514                 return -ESRCH; /* Crazy XFS error code */
1515
1516         if ((qid.type != USRQUOTA) &&
1517             (qid.type != GRPQUOTA))
1518                 return -EINVAL;
1519
1520         error = qd_get(sdp, qid, &qd);
1521         if (error)
1522                 return error;
1523         error = do_glock(qd, FORCE, &q_gh);
1524         if (error)
1525                 goto out;
1526
1527         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1528         fdq->d_version = FS_DQUOT_VERSION;
1529         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1530         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1531         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1532         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1533         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1534
1535         gfs2_glock_dq_uninit(&q_gh);
1536 out:
1537         qd_put(qd);
1538         return error;
1539 }
1540
1541 /* GFS2 only supports a subset of the XFS fields */
1542 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1543
1544 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1545                           struct fs_disk_quota *fdq)
1546 {
1547         struct gfs2_sbd *sdp = sb->s_fs_info;
1548         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1549         struct gfs2_quota_data *qd;
1550         struct gfs2_holder q_gh, i_gh;
1551         unsigned int data_blocks, ind_blocks;
1552         unsigned int blocks = 0;
1553         int alloc_required;
1554         loff_t offset;
1555         int error;
1556
1557         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1558                 return -ESRCH; /* Crazy XFS error code */
1559
1560         if ((qid.type != USRQUOTA) &&
1561             (qid.type != GRPQUOTA))
1562                 return -EINVAL;
1563
1564         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1565                 return -EINVAL;
1566
1567         error = qd_get(sdp, qid, &qd);
1568         if (error)
1569                 return error;
1570
1571         error = gfs2_rs_alloc(ip);
1572         if (error)
1573                 goto out_put;
1574
1575         mutex_lock(&ip->i_inode.i_mutex);
1576         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1577         if (error)
1578                 goto out_unlockput;
1579         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1580         if (error)
1581                 goto out_q;
1582
1583         /* Check for existing entry, if none then alloc new blocks */
1584         error = update_qd(sdp, qd);
1585         if (error)
1586                 goto out_i;
1587
1588         /* If nothing has changed, this is a no-op */
1589         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1590             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1591                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1592
1593         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1594             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1595                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1596
1597         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1598             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1599                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1600
1601         if (fdq->d_fieldmask == 0)
1602                 goto out_i;
1603
1604         offset = qd2offset(qd);
1605         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1606         if (gfs2_is_stuffed(ip))
1607                 alloc_required = 1;
1608         if (alloc_required) {
1609                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1610                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1611                                        &data_blocks, &ind_blocks);
1612                 blocks = 1 + data_blocks + ind_blocks;
1613                 ap.target = blocks;
1614                 error = gfs2_inplace_reserve(ip, &ap);
1615                 if (error)
1616                         goto out_i;
1617                 blocks += gfs2_rg_blocks(ip, blocks);
1618         }
1619
1620         /* Some quotas span block boundaries and can update two blocks,
1621            adding an extra block to the transaction to handle such quotas */
1622         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1623         if (error)
1624                 goto out_release;
1625
1626         /* Apply changes */
1627         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1628
1629         gfs2_trans_end(sdp);
1630 out_release:
1631         if (alloc_required)
1632                 gfs2_inplace_release(ip);
1633 out_i:
1634         gfs2_glock_dq_uninit(&i_gh);
1635 out_q:
1636         gfs2_glock_dq_uninit(&q_gh);
1637 out_unlockput:
1638         mutex_unlock(&ip->i_inode.i_mutex);
1639 out_put:
1640         qd_put(qd);
1641         return error;
1642 }
1643
1644 const struct quotactl_ops gfs2_quotactl_ops = {
1645         .quota_sync     = gfs2_quota_sync,
1646         .get_xstate     = gfs2_quota_get_xstate,
1647         .get_dqblk      = gfs2_get_dqblk,
1648         .set_dqblk      = gfs2_set_dqblk,
1649 };
1650
1651 void __init gfs2_quota_hash_init(void)
1652 {
1653         unsigned i;
1654
1655         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1656                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1657 }