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                 error = 0;
 336 out:
 337                 qd->qd_slot_count++;
 338         }
 339         spin_unlock(&sdp->sd_bitmap_lock);
 340
 341         return error;
 342 }
 343
 344 static void slot_hold(struct gfs2_quota_data *qd)
 345 {
 346         struct gfs2_sbd *sdp = qd->qd_sbd;
 347
 348         spin_lock(&sdp->sd_bitmap_lock);
 349         gfs2_assert(sdp, qd->qd_slot_count);
 350         qd->qd_slot_count++;
 351         spin_unlock(&sdp->sd_bitmap_lock);
 352 }
 353
 354 static void slot_put(struct gfs2_quota_data *qd)
 355 {
 356         struct gfs2_sbd *sdp = qd->qd_sbd;
 357
 358         spin_lock(&sdp->sd_bitmap_lock);
 359         gfs2_assert(sdp, qd->qd_slot_count);
 360         if (!--qd->qd_slot_count) {
 361                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 362                 qd->qd_slot = -1;
 363         }
 364         spin_unlock(&sdp->sd_bitmap_lock);
 365 }
 366
 367 static int bh_get(struct gfs2_quota_data *qd)
 368 {
 369         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 370         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 371         unsigned int block, offset;
 372         struct buffer_head *bh;
 373         int error;
 374         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 375
 376         mutex_lock(&sdp->sd_quota_mutex);
 377
 378         if (qd->qd_bh_count++) {
 379                 mutex_unlock(&sdp->sd_quota_mutex);
 380                 return 0;
 381         }
 382
 383         block = qd->qd_slot / sdp->sd_qc_per_block;
 384         offset = qd->qd_slot % sdp->sd_qc_per_block;
 385
 386         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 387         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 388         if (error)
 389                 goto fail;
 390         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 391         if (error)
 392                 goto fail;
 393         error = -EIO;
 394         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 395                 goto fail_brelse;
 396
 397         qd->qd_bh = bh;
 398         qd->qd_bh_qc = (struct gfs2_quota_change *)
 399                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 400                  offset * sizeof(struct gfs2_quota_change));
 401
 402         mutex_unlock(&sdp->sd_quota_mutex);
 403
 404         return 0;
 405
 406 fail_brelse:
 407         brelse(bh);
 408 fail:
 409         qd->qd_bh_count--;
 410         mutex_unlock(&sdp->sd_quota_mutex);
 411         return error;
 412 }
 413
 414 static void bh_put(struct gfs2_quota_data *qd)
 415 {
 416         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 417
 418         mutex_lock(&sdp->sd_quota_mutex);
 419         gfs2_assert(sdp, qd->qd_bh_count);
 420         if (!--qd->qd_bh_count) {
 421                 brelse(qd->qd_bh);
 422                 qd->qd_bh = NULL;
 423                 qd->qd_bh_qc = NULL;
 424         }
 425         mutex_unlock(&sdp->sd_quota_mutex);
 426 }
 427
 428 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 429                          u64 *sync_gen)
 430 {
 431         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 432             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 433             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 434                 return 0;
 435
 436         if (!lockref_get_not_dead(&qd->qd_lockref))
 437                 return 0;
 438
 439         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 440         set_bit(QDF_LOCKED, &qd->qd_flags);
 441         qd->qd_change_sync = qd->qd_change;
 442         slot_hold(qd);
 443         return 1;
 444 }
 445
 446 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 447 {
 448         struct gfs2_quota_data *qd = NULL;
 449         int error;
 450         int found = 0;
 451
 452         *qdp = NULL;
 453
 454         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 455                 return 0;
 456
 457         spin_lock(&qd_lock);
 458
 459         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 460                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
 461                 if (found)
 462                         break;
 463         }
 464
 465         if (!found)
 466                 qd = NULL;
 467
 468         spin_unlock(&qd_lock);
 469
 470         if (qd) {
 471                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 472                 error = bh_get(qd);
 473                 if (error) {
 474                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 475                         slot_put(qd);
 476                         qd_put(qd);
 477                         return error;
 478                 }
 479         }
 480
 481         *qdp = qd;
 482
 483         return 0;
 484 }
 485
 486 static void qd_unlock(struct gfs2_quota_data *qd)
 487 {
 488         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 489                          test_bit(QDF_LOCKED, &qd->qd_flags));
 490         clear_bit(QDF_LOCKED, &qd->qd_flags);
 491         bh_put(qd);
 492         slot_put(qd);
 493         qd_put(qd);
 494 }
 495
 496 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 497                     struct gfs2_quota_data **qdp)
 498 {
 499         int error;
 500
 501         error = qd_get(sdp, qid, qdp);
 502         if (error)
 503                 return error;
 504
 505         error = slot_get(*qdp);
 506         if (error)
 507                 goto fail;
 508
 509         error = bh_get(*qdp);
 510         if (error)
 511                 goto fail_slot;
 512
 513         return 0;
 514
 515 fail_slot:
 516         slot_put(*qdp);
 517 fail:
 518         qd_put(*qdp);
 519         return error;
 520 }
 521
 522 static void qdsb_put(struct gfs2_quota_data *qd)
 523 {
 524         bh_put(qd);
 525         slot_put(qd);
 526         qd_put(qd);
 527 }
 528
 529 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 530 {
 531         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 532         struct gfs2_quota_data **qd;
 533         int error;
 534
 535         if (ip->i_res == NULL) {
 536                 error = gfs2_rs_alloc(ip);
 537                 if (error)
 538                         return error;
 539         }
 540
 541         qd = ip->i_res->rs_qa_qd;
 542
 543         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 544             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 545                 return -EIO;
 546
 547         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 548                 return 0;
 549
 550         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 551         if (error)
 552                 goto out;
 553         ip->i_res->rs_qa_qd_num++;
 554         qd++;
 555
 556         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 557         if (error)
 558                 goto out;
 559         ip->i_res->rs_qa_qd_num++;
 560         qd++;
 561
 562         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 563             !uid_eq(uid, ip->i_inode.i_uid)) {
 564                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 565                 if (error)
 566                         goto out;
 567                 ip->i_res->rs_qa_qd_num++;
 568                 qd++;
 569         }
 570
 571         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 572             !gid_eq(gid, ip->i_inode.i_gid)) {
 573                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 574                 if (error)
 575                         goto out;
 576                 ip->i_res->rs_qa_qd_num++;
 577                 qd++;
 578         }
 579
 580 out:
 581         if (error)
 582                 gfs2_quota_unhold(ip);
 583         return error;
 584 }
 585
 586 void gfs2_quota_unhold(struct gfs2_inode *ip)
 587 {
 588         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 589         unsigned int x;
 590
 591         if (ip->i_res == NULL)
 592                 return;
 593         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 594
 595         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 596                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 597                 ip->i_res->rs_qa_qd[x] = NULL;
 598         }
 599         ip->i_res->rs_qa_qd_num = 0;
 600 }
 601
 602 static int sort_qd(const void *a, const void *b)
 603 {
 604         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 605         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 606
 607         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 608                 return -1;
 609         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 610                 return 1;
 611         return 0;
 612 }
 613
 614 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 615 {
 616         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 617         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 618         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 619         s64 x;
 620
 621         mutex_lock(&sdp->sd_quota_mutex);
 622         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 623
 624         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 625                 qc->qc_change = 0;
 626                 qc->qc_flags = 0;
 627                 if (qd->qd_id.type == USRQUOTA)
 628                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 629                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 630         }
 631
 632         x = be64_to_cpu(qc->qc_change) + change;
 633         qc->qc_change = cpu_to_be64(x);
 634
 635         spin_lock(&qd_lock);
 636         qd->qd_change = x;
 637         spin_unlock(&qd_lock);
 638
 639         if (!x) {
 640                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 641                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 642                 qc->qc_flags = 0;
 643                 qc->qc_id = 0;
 644                 slot_put(qd);
 645                 qd_put(qd);
 646         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 647                 qd_hold(qd);
 648                 slot_hold(qd);
 649         }
 650
 651         mutex_unlock(&sdp->sd_quota_mutex);
 652 }
 653
 654 /**
 655  * gfs2_adjust_quota - adjust record of current block usage
 656  * @ip: The quota inode
 657  * @loc: Offset of the entry in the quota file
 658  * @change: The amount of usage change to record
 659  * @qd: The quota data
 660  * @fdq: The updated limits to record
 661  *
 662  * This function was mostly borrowed from gfs2_block_truncate_page which was
 663  * in turn mostly borrowed from ext3
 664  *
 665  * Returns: 0 or -ve on error
 666  */
 667
 668 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 669                              s64 change, struct gfs2_quota_data *qd,
 670                              struct fs_disk_quota *fdq)
 671 {
 672         struct inode *inode = &ip->i_inode;
 673         struct gfs2_sbd *sdp = GFS2_SB(inode);
 674         struct address_space *mapping = inode->i_mapping;
 675         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 676         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 677         unsigned blocksize, iblock, pos;
 678         struct buffer_head *bh;
 679         struct page *page;
 680         void *kaddr, *ptr;
 681         struct gfs2_quota q;
 682         int err, nbytes;
 683         u64 size;
 684
 685         if (gfs2_is_stuffed(ip)) {
 686                 err = gfs2_unstuff_dinode(ip, NULL);
 687                 if (err)
 688                         return err;
 689         }
 690
 691         memset(&q, 0, sizeof(struct gfs2_quota));
 692         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 693         if (err < 0)
 694                 return err;
 695
 696         err = -EIO;
 697         be64_add_cpu(&q.qu_value, change);
 698         qd->qd_qb.qb_value = q.qu_value;
 699         if (fdq) {
 700                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 701                         q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 702                         qd->qd_qb.qb_warn = q.qu_warn;
 703                 }
 704                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 705                         q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 706                         qd->qd_qb.qb_limit = q.qu_limit;
 707                 }
 708                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 709                         q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 710                         qd->qd_qb.qb_value = q.qu_value;
 711                 }
 712         }
 713
 714         /* Write the quota into the quota file on disk */
 715         ptr = &q;
 716         nbytes = sizeof(struct gfs2_quota);
 717 get_a_page:
 718         page = find_or_create_page(mapping, index, GFP_NOFS);
 719         if (!page)
 720                 return -ENOMEM;
 721
 722         blocksize = inode->i_sb->s_blocksize;
 723         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 724
 725         if (!page_has_buffers(page))
 726                 create_empty_buffers(page, blocksize, 0);
 727
 728         bh = page_buffers(page);
 729         pos = blocksize;
 730         while (offset >= pos) {
 731                 bh = bh->b_this_page;
 732                 iblock++;
 733                 pos += blocksize;
 734         }
 735
 736         if (!buffer_mapped(bh)) {
 737                 gfs2_block_map(inode, iblock, bh, 1);
 738                 if (!buffer_mapped(bh))
 739                         goto unlock_out;
 740                 /* If it's a newly allocated disk block for quota, zero it */
 741                 if (buffer_new(bh))
 742                         zero_user(page, pos - blocksize, bh->b_size);
 743         }
 744
 745         if (PageUptodate(page))
 746                 set_buffer_uptodate(bh);
 747
 748         if (!buffer_uptodate(bh)) {
 749                 ll_rw_block(READ | REQ_META, 1, &bh);
 750                 wait_on_buffer(bh);
 751                 if (!buffer_uptodate(bh))
 752                         goto unlock_out;
 753         }
 754
 755         gfs2_trans_add_data(ip->i_gl, bh);
 756
 757         kaddr = kmap_atomic(page);
 758         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 759                 nbytes = PAGE_CACHE_SIZE - offset;
 760         memcpy(kaddr + offset, ptr, nbytes);
 761         flush_dcache_page(page);
 762         kunmap_atomic(kaddr);
 763         unlock_page(page);
 764         page_cache_release(page);
 765
 766         /* If quota straddles page boundary, we need to update the rest of the
 767          * quota at the beginning of the next page */
 768         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 769                 ptr = ptr + nbytes;
 770                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 771                 offset = 0;
 772                 index++;
 773                 goto get_a_page;
 774         }
 775
 776         size = loc + sizeof(struct gfs2_quota);
 777         if (size > inode->i_size)
 778                 i_size_write(inode, size);
 779         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 780         mark_inode_dirty(inode);
 781         set_bit(QDF_REFRESH, &qd->qd_flags);
 782         return 0;
 783
 784 unlock_out:
 785         unlock_page(page);
 786         page_cache_release(page);
 787         return err;
 788 }
 789
 790 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 791 {
 792         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 793         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 794         struct gfs2_alloc_parms ap = { .aflags = 0, };
 795         unsigned int data_blocks, ind_blocks;
 796         struct gfs2_holder *ghs, i_gh;
 797         unsigned int qx, x;
 798         struct gfs2_quota_data *qd;
 799         unsigned reserved;
 800         loff_t offset;
 801         unsigned int nalloc = 0, blocks;
 802         int error;
 803
 804         error = gfs2_rs_alloc(ip);
 805         if (error)
 806                 return error;
 807
 808         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 809                               &data_blocks, &ind_blocks);
 810
 811         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 812         if (!ghs)
 813                 return -ENOMEM;
 814
 815         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 816         mutex_lock(&ip->i_inode.i_mutex);
 817         for (qx = 0; qx < num_qd; qx++) {
 818                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 819                                            GL_NOCACHE, &ghs[qx]);
 820                 if (error)
 821                         goto out;
 822         }
 823
 824         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 825         if (error)
 826                 goto out;
 827
 828         for (x = 0; x < num_qd; x++) {
 829                 offset = qd2offset(qda[x]);
 830                 if (gfs2_write_alloc_required(ip, offset,
 831                                               sizeof(struct gfs2_quota)))
 832                         nalloc++;
 833         }
 834
 835         /*
 836          * 1 blk for unstuffing inode if stuffed. We add this extra
 837          * block to the reservation unconditionally. If the inode
 838          * doesn't need unstuffing, the block will be released to the
 839          * rgrp since it won't be allocated during the transaction
 840          */
 841         /* +3 in the end for unstuffing block, inode size update block
 842          * and another block in case quota straddles page boundary and
 843          * two blocks need to be updated instead of 1 */
 844         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 845
 846         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 847         ap.target = reserved;
 848         error = gfs2_inplace_reserve(ip, &ap);
 849         if (error)
 850                 goto out_alloc;
 851
 852         if (nalloc)
 853                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 854
 855         error = gfs2_trans_begin(sdp, blocks, 0);
 856         if (error)
 857                 goto out_ipres;
 858
 859         for (x = 0; x < num_qd; x++) {
 860                 qd = qda[x];
 861                 offset = qd2offset(qd);
 862                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 863                 if (error)
 864                         goto out_end_trans;
 865
 866                 do_qc(qd, -qd->qd_change_sync);
 867                 set_bit(QDF_REFRESH, &qd->qd_flags);
 868         }
 869
 870         error = 0;
 871
 872 out_end_trans:
 873         gfs2_trans_end(sdp);
 874 out_ipres:
 875         gfs2_inplace_release(ip);
 876 out_alloc:
 877         gfs2_glock_dq_uninit(&i_gh);
 878 out:
 879         while (qx--)
 880                 gfs2_glock_dq_uninit(&ghs[qx]);
 881         mutex_unlock(&ip->i_inode.i_mutex);
 882         kfree(ghs);
 883         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl, NORMAL_FLUSH);
 884         return error;
 885 }
 886
 887 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 888 {
 889         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 890         struct gfs2_quota q;
 891         struct gfs2_quota_lvb *qlvb;
 892         loff_t pos;
 893         int error;
 894
 895         memset(&q, 0, sizeof(struct gfs2_quota));
 896         pos = qd2offset(qd);
 897         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 898         if (error < 0)
 899                 return error;
 900
 901         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 902         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 903         qlvb->__pad = 0;
 904         qlvb->qb_limit = q.qu_limit;
 905         qlvb->qb_warn = q.qu_warn;
 906         qlvb->qb_value = q.qu_value;
 907         qd->qd_qb = *qlvb;
 908
 909         return 0;
 910 }
 911
 912 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 913                     struct gfs2_holder *q_gh)
 914 {
 915         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 916         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 917         struct gfs2_holder i_gh;
 918         int error;
 919
 920 restart:
 921         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 922         if (error)
 923                 return error;
 924
 925         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 926
 927         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 928                 gfs2_glock_dq_uninit(q_gh);
 929                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 930                                            GL_NOCACHE, q_gh);
 931                 if (error)
 932                         return error;
 933
 934                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 935                 if (error)
 936                         goto fail;
 937
 938                 error = update_qd(sdp, qd);
 939                 if (error)
 940                         goto fail_gunlock;
 941
 942                 gfs2_glock_dq_uninit(&i_gh);
 943                 gfs2_glock_dq_uninit(q_gh);
 944                 force_refresh = 0;
 945                 goto restart;
 946         }
 947
 948         return 0;
 949
 950 fail_gunlock:
 951         gfs2_glock_dq_uninit(&i_gh);
 952 fail:
 953         gfs2_glock_dq_uninit(q_gh);
 954         return error;
 955 }
 956
 957 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 958 {
 959         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 960         struct gfs2_quota_data *qd;
 961         unsigned int x;
 962         int error = 0;
 963
 964         error = gfs2_quota_hold(ip, uid, gid);
 965         if (error)
 966                 return error;
 967
 968         if (capable(CAP_SYS_RESOURCE) ||
 969             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 970                 return 0;
 971
 972         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 973              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 974
 975         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 976                 int force = NO_FORCE;
 977                 qd = ip->i_res->rs_qa_qd[x];
 978                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 979                         force = FORCE;
 980                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 981                 if (error)
 982                         break;
 983         }
 984
 985         if (!error)
 986                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 987         else {
 988                 while (x--)
 989                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 990                 gfs2_quota_unhold(ip);
 991         }
 992
 993         return error;
 994 }
 995
 996 static int need_sync(struct gfs2_quota_data *qd)
 997 {
 998         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 999         struct gfs2_tune *gt = &sdp->sd_tune;
1000         s64 value;
1001         unsigned int num, den;
1002         int do_sync = 1;
1003
1004         if (!qd->qd_qb.qb_limit)
1005                 return 0;
1006
1007         spin_lock(&qd_lock);
1008         value = qd->qd_change;
1009         spin_unlock(&qd_lock);
1010
1011         spin_lock(&gt->gt_spin);
1012         num = gt->gt_quota_scale_num;
1013         den = gt->gt_quota_scale_den;
1014         spin_unlock(&gt->gt_spin);
1015
1016         if (value < 0)
1017                 do_sync = 0;
1018         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1019                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1020                 do_sync = 0;
1021         else {
1022                 value *= gfs2_jindex_size(sdp) * num;
1023                 value = div_s64(value, den);
1024                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1025                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1026                         do_sync = 0;
1027         }
1028
1029         return do_sync;
1030 }
1031
1032 void gfs2_quota_unlock(struct gfs2_inode *ip)
1033 {
1034         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1035         struct gfs2_quota_data *qda[4];
1036         unsigned int count = 0;
1037         unsigned int x;
1038         int found;
1039
1040         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1041                 goto out;
1042
1043         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1044                 struct gfs2_quota_data *qd;
1045                 int sync;
1046
1047                 qd = ip->i_res->rs_qa_qd[x];
1048                 sync = need_sync(qd);
1049
1050                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1051                 if (!sync)
1052                         continue;
1053
1054                 spin_lock(&qd_lock);
1055                 found = qd_check_sync(sdp, qd, NULL);
1056                 spin_unlock(&qd_lock);
1057
1058                 if (!found)
1059                         continue;
1060
1061                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1062                 if (bh_get(qd)) {
1063                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1064                         slot_put(qd);
1065                         qd_put(qd);
1066                         continue;
1067                 }
1068
1069                 qda[count++] = qd;
1070         }
1071
1072         if (count) {
1073                 do_sync(count, qda);
1074                 for (x = 0; x < count; x++)
1075                         qd_unlock(qda[x]);
1076         }
1077
1078 out:
1079         gfs2_quota_unhold(ip);
1080 }
1081
1082 #define MAX_LINE 256
1083
1084 static int print_message(struct gfs2_quota_data *qd, char *type)
1085 {
1086         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1087
1088         fs_info(sdp, "quota %s for %s %u\n",
1089                 type,
1090                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1091                 from_kqid(&init_user_ns, qd->qd_id));
1092
1093         return 0;
1094 }
1095
1096 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1097 {
1098         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1099         struct gfs2_quota_data *qd;
1100         s64 value;
1101         unsigned int x;
1102         int error = 0;
1103
1104         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1105                 return 0;
1106
1107         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1108                 return 0;
1109
1110         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1111                 qd = ip->i_res->rs_qa_qd[x];
1112
1113                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1114                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1115                         continue;
1116
1117                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1118                 spin_lock(&qd_lock);
1119                 value += qd->qd_change;
1120                 spin_unlock(&qd_lock);
1121
1122                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1123                         print_message(qd, "exceeded");
1124                         quota_send_warning(qd->qd_id,
1125                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1126
1127                         error = -EDQUOT;
1128                         break;
1129                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1130                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1131                            time_after_eq(jiffies, qd->qd_last_warn +
1132                                          gfs2_tune_get(sdp,
1133                                                 gt_quota_warn_period) * HZ)) {
1134                         quota_send_warning(qd->qd_id,
1135                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1136                         error = print_message(qd, "warning");
1137                         qd->qd_last_warn = jiffies;
1138                 }
1139         }
1140
1141         return error;
1142 }
1143
1144 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1145                        kuid_t uid, kgid_t gid)
1146 {
1147         struct gfs2_quota_data *qd;
1148         unsigned int x;
1149
1150         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1151                 return;
1152         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1153                 return;
1154
1155         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1156                 qd = ip->i_res->rs_qa_qd[x];
1157
1158                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1159                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1160                         do_qc(qd, change);
1161                 }
1162         }
1163 }
1164
1165 int gfs2_quota_sync(struct super_block *sb, int type)
1166 {
1167         struct gfs2_sbd *sdp = sb->s_fs_info;
1168         struct gfs2_quota_data **qda;
1169         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1170         unsigned int num_qd;
1171         unsigned int x;
1172         int error = 0;
1173
1174         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1175         if (!qda)
1176                 return -ENOMEM;
1177
1178         mutex_lock(&sdp->sd_quota_sync_mutex);
1179         sdp->sd_quota_sync_gen++;
1180
1181         do {
1182                 num_qd = 0;
1183
1184                 for (;;) {
1185                         error = qd_fish(sdp, qda + num_qd);
1186                         if (error || !qda[num_qd])
1187                                 break;
1188                         if (++num_qd == max_qd)
1189                                 break;
1190                 }
1191
1192                 if (num_qd) {
1193                         if (!error)
1194                                 error = do_sync(num_qd, qda);
1195                         if (!error)
1196                                 for (x = 0; x < num_qd; x++)
1197                                         qda[x]->qd_sync_gen =
1198                                                 sdp->sd_quota_sync_gen;
1199
1200                         for (x = 0; x < num_qd; x++)
1201                                 qd_unlock(qda[x]);
1202                 }
1203         } while (!error && num_qd == max_qd);
1204
1205         mutex_unlock(&sdp->sd_quota_sync_mutex);
1206         kfree(qda);
1207
1208         return error;
1209 }
1210
1211 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1212 {
1213         struct gfs2_quota_data *qd;
1214         struct gfs2_holder q_gh;
1215         int error;
1216
1217         error = qd_get(sdp, qid, &qd);
1218         if (error)
1219                 return error;
1220
1221         error = do_glock(qd, FORCE, &q_gh);
1222         if (!error)
1223                 gfs2_glock_dq_uninit(&q_gh);
1224
1225         qd_put(qd);
1226         return error;
1227 }
1228
1229 int gfs2_quota_init(struct gfs2_sbd *sdp)
1230 {
1231         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1232         u64 size = i_size_read(sdp->sd_qc_inode);
1233         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1234         unsigned int x, slot = 0;
1235         unsigned int found = 0;
1236         unsigned int hash;
1237         unsigned int bm_size;
1238         u64 dblock;
1239         u32 extlen = 0;
1240         int error;
1241
1242         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1243                 return -EIO;
1244
1245         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1246         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1247         bm_size *= sizeof(unsigned long);
1248         error = -ENOMEM;
1249         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1250         if (sdp->sd_quota_bitmap == NULL)
1251                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1252                                                  __GFP_ZERO, PAGE_KERNEL);
1253         if (!sdp->sd_quota_bitmap)
1254                 return error;
1255
1256         for (x = 0; x < blocks; x++) {
1257                 struct buffer_head *bh;
1258                 const struct gfs2_quota_change *qc;
1259                 unsigned int y;
1260
1261                 if (!extlen) {
1262                         int new = 0;
1263                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1264                         if (error)
1265                                 goto fail;
1266                 }
1267                 error = -EIO;
1268                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1269                 if (!bh)
1270                         goto fail;
1271                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1272                         brelse(bh);
1273                         goto fail;
1274                 }
1275
1276                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1277                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1278                      y++, slot++) {
1279                         struct gfs2_quota_data *qd;
1280                         s64 qc_change = be64_to_cpu(qc->qc_change);
1281                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1282                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1283                                                 USRQUOTA : GRPQUOTA;
1284                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1285                                                       be32_to_cpu(qc->qc_id));
1286                         qc++;
1287                         if (!qc_change)
1288                                 continue;
1289
1290                         hash = gfs2_qd_hash(sdp, qc_id);
1291                         qd = qd_alloc(hash, sdp, qc_id);
1292                         if (qd == NULL) {
1293                                 brelse(bh);
1294                                 goto fail;
1295                         }
1296
1297                         set_bit(QDF_CHANGE, &qd->qd_flags);
1298                         qd->qd_change = qc_change;
1299                         qd->qd_slot = slot;
1300                         qd->qd_slot_count = 1;
1301
1302                         spin_lock(&qd_lock);
1303                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1304                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1305                         atomic_inc(&sdp->sd_quota_count);
1306                         spin_unlock(&qd_lock);
1307
1308                         spin_lock_bucket(hash);
1309                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1310                         spin_unlock_bucket(hash);
1311
1312                         found++;
1313                 }
1314
1315                 brelse(bh);
1316                 dblock++;
1317                 extlen--;
1318         }
1319
1320         if (found)
1321                 fs_info(sdp, "found %u quota changes\n", found);
1322
1323         return 0;
1324
1325 fail:
1326         gfs2_quota_cleanup(sdp);
1327         return error;
1328 }
1329
1330 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1331 {
1332         struct list_head *head = &sdp->sd_quota_list;
1333         struct gfs2_quota_data *qd;
1334
1335         spin_lock(&qd_lock);
1336         while (!list_empty(head)) {
1337                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1338
1339                 list_del(&qd->qd_list);
1340
1341                 /* Also remove if this qd exists in the reclaim list */
1342                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1343                 atomic_dec(&sdp->sd_quota_count);
1344                 spin_unlock(&qd_lock);
1345
1346                 spin_lock_bucket(qd->qd_hash);
1347                 hlist_bl_del_rcu(&qd->qd_hlist);
1348                 spin_unlock_bucket(qd->qd_hash);
1349
1350                 gfs2_assert_warn(sdp, !qd->qd_change);
1351                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1352                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1353
1354                 gfs2_glock_put(qd->qd_gl);
1355                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1356
1357                 spin_lock(&qd_lock);
1358         }
1359         spin_unlock(&qd_lock);
1360
1361         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1362
1363         kvfree(sdp->sd_quota_bitmap);
1364         sdp->sd_quota_bitmap = NULL;
1365 }
1366
1367 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1368 {
1369         if (error == 0 || error == -EROFS)
1370                 return;
1371         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1372                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1373 }
1374
1375 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1376                                int (*fxn)(struct super_block *sb, int type),
1377                                unsigned long t, unsigned long *timeo,
1378                                unsigned int *new_timeo)
1379 {
1380         if (t >= *timeo) {
1381                 int error = fxn(sdp->sd_vfs, 0);
1382                 quotad_error(sdp, msg, error);
1383                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1384         } else {
1385                 *timeo -= t;
1386         }
1387 }
1388
1389 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1390 {
1391         struct gfs2_inode *ip;
1392
1393         while(1) {
1394                 ip = NULL;
1395                 spin_lock(&sdp->sd_trunc_lock);
1396                 if (!list_empty(&sdp->sd_trunc_list)) {
1397                         ip = list_entry(sdp->sd_trunc_list.next,
1398                                         struct gfs2_inode, i_trunc_list);
1399                         list_del_init(&ip->i_trunc_list);
1400                 }
1401                 spin_unlock(&sdp->sd_trunc_lock);
1402                 if (ip == NULL)
1403                         return;
1404                 gfs2_glock_finish_truncate(ip);
1405         }
1406 }
1407
1408 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1409         if (!sdp->sd_statfs_force_sync) {
1410                 sdp->sd_statfs_force_sync = 1;
1411                 wake_up(&sdp->sd_quota_wait);
1412         }
1413 }
1414
1415
1416 /**
1417  * gfs2_quotad - Write cached quota changes into the quota file
1418  * @sdp: Pointer to GFS2 superblock
1419  *
1420  */
1421
1422 int gfs2_quotad(void *data)
1423 {
1424         struct gfs2_sbd *sdp = data;
1425         struct gfs2_tune *tune = &sdp->sd_tune;
1426         unsigned long statfs_timeo = 0;
1427         unsigned long quotad_timeo = 0;
1428         unsigned long t = 0;
1429         DEFINE_WAIT(wait);
1430         int empty;
1431
1432         while (!kthread_should_stop()) {
1433
1434                 /* Update the master statfs file */
1435                 if (sdp->sd_statfs_force_sync) {
1436                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1437                         quotad_error(sdp, "statfs", error);
1438                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1439                 }
1440                 else
1441                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1442                                            &statfs_timeo,
1443                                            &tune->gt_statfs_quantum);
1444
1445                 /* Update quota file */
1446                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1447                                    &quotad_timeo, &tune->gt_quota_quantum);
1448
1449                 /* Check for & recover partially truncated inodes */
1450                 quotad_check_trunc_list(sdp);
1451
1452                 try_to_freeze();
1453
1454                 t = min(quotad_timeo, statfs_timeo);
1455
1456                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1457                 spin_lock(&sdp->sd_trunc_lock);
1458                 empty = list_empty(&sdp->sd_trunc_list);
1459                 spin_unlock(&sdp->sd_trunc_lock);
1460                 if (empty && !sdp->sd_statfs_force_sync)
1461                         t -= schedule_timeout(t);
1462                 else
1463                         t = 0;
1464                 finish_wait(&sdp->sd_quota_wait, &wait);
1465         }
1466
1467         return 0;
1468 }
1469
1470 static int gfs2_quota_get_xstate(struct super_block *sb,
1471                                  struct fs_quota_stat *fqs)
1472 {
1473         struct gfs2_sbd *sdp = sb->s_fs_info;
1474
1475         memset(fqs, 0, sizeof(struct fs_quota_stat));
1476         fqs->qs_version = FS_QSTAT_VERSION;
1477
1478         switch (sdp->sd_args.ar_quota) {
1479         case GFS2_QUOTA_ON:
1480                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1481                 /*FALLTHRU*/
1482         case GFS2_QUOTA_ACCOUNT:
1483                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1484                 break;
1485         case GFS2_QUOTA_OFF:
1486                 break;
1487         }
1488
1489         if (sdp->sd_quota_inode) {
1490                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1491                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1492         }
1493         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1494         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1495         fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1496         return 0;
1497 }
1498
1499 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1500                           struct fs_disk_quota *fdq)
1501 {
1502         struct gfs2_sbd *sdp = sb->s_fs_info;
1503         struct gfs2_quota_lvb *qlvb;
1504         struct gfs2_quota_data *qd;
1505         struct gfs2_holder q_gh;
1506         int error;
1507
1508         memset(fdq, 0, sizeof(struct fs_disk_quota));
1509
1510         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1511                 return -ESRCH; /* Crazy XFS error code */
1512
1513         if ((qid.type != USRQUOTA) &&
1514             (qid.type != GRPQUOTA))
1515                 return -EINVAL;
1516
1517         error = qd_get(sdp, qid, &qd);
1518         if (error)
1519                 return error;
1520         error = do_glock(qd, FORCE, &q_gh);
1521         if (error)
1522                 goto out;
1523
1524         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1525         fdq->d_version = FS_DQUOT_VERSION;
1526         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1527         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1528         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1529         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1530         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1531
1532         gfs2_glock_dq_uninit(&q_gh);
1533 out:
1534         qd_put(qd);
1535         return error;
1536 }
1537
1538 /* GFS2 only supports a subset of the XFS fields */
1539 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1540
1541 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1542                           struct fs_disk_quota *fdq)
1543 {
1544         struct gfs2_sbd *sdp = sb->s_fs_info;
1545         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1546         struct gfs2_quota_data *qd;
1547         struct gfs2_holder q_gh, i_gh;
1548         unsigned int data_blocks, ind_blocks;
1549         unsigned int blocks = 0;
1550         int alloc_required;
1551         loff_t offset;
1552         int error;
1553
1554         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1555                 return -ESRCH; /* Crazy XFS error code */
1556
1557         if ((qid.type != USRQUOTA) &&
1558             (qid.type != GRPQUOTA))
1559                 return -EINVAL;
1560
1561         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1562                 return -EINVAL;
1563
1564         error = qd_get(sdp, qid, &qd);
1565         if (error)
1566                 return error;
1567
1568         error = gfs2_rs_alloc(ip);
1569         if (error)
1570                 goto out_put;
1571
1572         mutex_lock(&ip->i_inode.i_mutex);
1573         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1574         if (error)
1575                 goto out_unlockput;
1576         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1577         if (error)
1578                 goto out_q;
1579
1580         /* Check for existing entry, if none then alloc new blocks */
1581         error = update_qd(sdp, qd);
1582         if (error)
1583                 goto out_i;
1584
1585         /* If nothing has changed, this is a no-op */
1586         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1587             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1588                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1589
1590         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1591             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1592                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1593
1594         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1595             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1596                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1597
1598         if (fdq->d_fieldmask == 0)
1599                 goto out_i;
1600
1601         offset = qd2offset(qd);
1602         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1603         if (gfs2_is_stuffed(ip))
1604                 alloc_required = 1;
1605         if (alloc_required) {
1606                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1607                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1608                                        &data_blocks, &ind_blocks);
1609                 blocks = 1 + data_blocks + ind_blocks;
1610                 ap.target = blocks;
1611                 error = gfs2_inplace_reserve(ip, &ap);
1612                 if (error)
1613                         goto out_i;
1614                 blocks += gfs2_rg_blocks(ip, blocks);
1615         }
1616
1617         /* Some quotas span block boundaries and can update two blocks,
1618            adding an extra block to the transaction to handle such quotas */
1619         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1620         if (error)
1621                 goto out_release;
1622
1623         /* Apply changes */
1624         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1625
1626         gfs2_trans_end(sdp);
1627 out_release:
1628         if (alloc_required)
1629                 gfs2_inplace_release(ip);
1630 out_i:
1631         gfs2_glock_dq_uninit(&i_gh);
1632 out_q:
1633         gfs2_glock_dq_uninit(&q_gh);
1634 out_unlockput:
1635         mutex_unlock(&ip->i_inode.i_mutex);
1636 out_put:
1637         qd_put(qd);
1638         return error;
1639 }
1640
1641 const struct quotactl_ops gfs2_quotactl_ops = {
1642         .quota_sync     = gfs2_quota_sync,
1643         .get_xstate     = gfs2_quota_get_xstate,
1644         .get_dqblk      = gfs2_get_dqblk,
1645         .set_dqblk      = gfs2_set_dqblk,
1646 };
1647
1648 void __init gfs2_quota_hash_init(void)
1649 {
1650         unsigned i;
1651
1652         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1653                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1654 }