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   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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 to 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 #include <linux/sched.h>
  40 #include <linux/slab.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/completion.h>
  43 #include <linux/buffer_head.h>
  44 #include <linux/sort.h>
  45 #include <linux/fs.h>
  46 #include <linux/bio.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <linux/lm_interface.h>
  49
  50 #include "gfs2.h"
  51 #include "incore.h"
  52 #include "bmap.h"
  53 #include "glock.h"
  54 #include "glops.h"
  55 #include "log.h"
  56 #include "meta_io.h"
  57 #include "quota.h"
  58 #include "rgrp.h"
  59 #include "super.h"
  60 #include "trans.h"
  61 #include "inode.h"
  62 #include "ops_file.h"
  63 #include "ops_address.h"
  64 #include "util.h"
  65
  66 #define QUOTA_USER 1
  67 #define QUOTA_GROUP 0
  68
  69 struct gfs2_quota_host {
  70         u64 qu_limit;
  71         u64 qu_warn;
  72         s64 qu_value;
  73         u32 qu_ll_next;
  74 };
  75
  76 struct gfs2_quota_change_host {
  77         u64 qc_change;
  78         u32 qc_flags; /* GFS2_QCF_... */
  79         u32 qc_id;
  80 };
  81
  82 static u64 qd2offset(struct gfs2_quota_data *qd)
  83 {
  84         u64 offset;
  85
  86         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
  87         offset *= sizeof(struct gfs2_quota);
  88
  89         return offset;
  90 }
  91
  92 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
  93                     struct gfs2_quota_data **qdp)
  94 {
  95         struct gfs2_quota_data *qd;
  96         int error;
  97
  98         qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
  99         if (!qd)
 100                 return -ENOMEM;
 101
 102         qd->qd_count = 1;
 103         qd->qd_id = id;
 104         if (user)
 105                 set_bit(QDF_USER, &qd->qd_flags);
 106         qd->qd_slot = -1;
 107
 108         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
 109                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 110         if (error)
 111                 goto fail;
 112
 113         error = gfs2_lvb_hold(qd->qd_gl);
 114         gfs2_glock_put(qd->qd_gl);
 115         if (error)
 116                 goto fail;
 117
 118         *qdp = qd;
 119
 120         return 0;
 121
 122 fail:
 123         kfree(qd);
 124         return error;
 125 }
 126
 127 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 128                   struct gfs2_quota_data **qdp)
 129 {
 130         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 131         int error, found;
 132
 133         *qdp = NULL;
 134
 135         for (;;) {
 136                 found = 0;
 137                 spin_lock(&sdp->sd_quota_spin);
 138                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 139                         if (qd->qd_id == id &&
 140                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 141                                 qd->qd_count++;
 142                                 found = 1;
 143                                 break;
 144                         }
 145                 }
 146
 147                 if (!found)
 148                         qd = NULL;
 149
 150                 if (!qd && new_qd) {
 151                         qd = new_qd;
 152                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 153                         atomic_inc(&sdp->sd_quota_count);
 154                         new_qd = NULL;
 155                 }
 156
 157                 spin_unlock(&sdp->sd_quota_spin);
 158
 159                 if (qd || !create) {
 160                         if (new_qd) {
 161                                 gfs2_lvb_unhold(new_qd->qd_gl);
 162                                 kfree(new_qd);
 163                         }
 164                         *qdp = qd;
 165                         return 0;
 166                 }
 167
 168                 error = qd_alloc(sdp, user, id, &new_qd);
 169                 if (error)
 170                         return error;
 171         }
 172 }
 173
 174 static void qd_hold(struct gfs2_quota_data *qd)
 175 {
 176         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 177
 178         spin_lock(&sdp->sd_quota_spin);
 179         gfs2_assert(sdp, qd->qd_count);
 180         qd->qd_count++;
 181         spin_unlock(&sdp->sd_quota_spin);
 182 }
 183
 184 static void qd_put(struct gfs2_quota_data *qd)
 185 {
 186         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 187         spin_lock(&sdp->sd_quota_spin);
 188         gfs2_assert(sdp, qd->qd_count);
 189         if (!--qd->qd_count)
 190                 qd->qd_last_touched = jiffies;
 191         spin_unlock(&sdp->sd_quota_spin);
 192 }
 193
 194 static int slot_get(struct gfs2_quota_data *qd)
 195 {
 196         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 197         unsigned int c, o = 0, b;
 198         unsigned char byte = 0;
 199
 200         spin_lock(&sdp->sd_quota_spin);
 201
 202         if (qd->qd_slot_count++) {
 203                 spin_unlock(&sdp->sd_quota_spin);
 204                 return 0;
 205         }
 206
 207         for (c = 0; c < sdp->sd_quota_chunks; c++)
 208                 for (o = 0; o < PAGE_SIZE; o++) {
 209                         byte = sdp->sd_quota_bitmap[c][o];
 210                         if (byte != 0xFF)
 211                                 goto found;
 212                 }
 213
 214         goto fail;
 215
 216 found:
 217         for (b = 0; b < 8; b++)
 218                 if (!(byte & (1 << b)))
 219                         break;
 220         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 221
 222         if (qd->qd_slot >= sdp->sd_quota_slots)
 223                 goto fail;
 224
 225         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 226
 227         spin_unlock(&sdp->sd_quota_spin);
 228
 229         return 0;
 230
 231 fail:
 232         qd->qd_slot_count--;
 233         spin_unlock(&sdp->sd_quota_spin);
 234         return -ENOSPC;
 235 }
 236
 237 static void slot_hold(struct gfs2_quota_data *qd)
 238 {
 239         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 240
 241         spin_lock(&sdp->sd_quota_spin);
 242         gfs2_assert(sdp, qd->qd_slot_count);
 243         qd->qd_slot_count++;
 244         spin_unlock(&sdp->sd_quota_spin);
 245 }
 246
 247 static void slot_put(struct gfs2_quota_data *qd)
 248 {
 249         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 250
 251         spin_lock(&sdp->sd_quota_spin);
 252         gfs2_assert(sdp, qd->qd_slot_count);
 253         if (!--qd->qd_slot_count) {
 254                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 255                 qd->qd_slot = -1;
 256         }
 257         spin_unlock(&sdp->sd_quota_spin);
 258 }
 259
 260 static int bh_get(struct gfs2_quota_data *qd)
 261 {
 262         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 263         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 264         unsigned int block, offset;
 265         struct buffer_head *bh;
 266         int error;
 267         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 268
 269         mutex_lock(&sdp->sd_quota_mutex);
 270
 271         if (qd->qd_bh_count++) {
 272                 mutex_unlock(&sdp->sd_quota_mutex);
 273                 return 0;
 274         }
 275
 276         block = qd->qd_slot / sdp->sd_qc_per_block;
 277         offset = qd->qd_slot % sdp->sd_qc_per_block;;
 278
 279         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 280         error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map);
 281         if (error)
 282                 goto fail;
 283         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 284         if (error)
 285                 goto fail;
 286         error = -EIO;
 287         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 288                 goto fail_brelse;
 289
 290         qd->qd_bh = bh;
 291         qd->qd_bh_qc = (struct gfs2_quota_change *)
 292                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 293                  offset * sizeof(struct gfs2_quota_change));
 294
 295         mutex_unlock(&sdp->sd_quota_mutex);
 296
 297         return 0;
 298
 299 fail_brelse:
 300         brelse(bh);
 301 fail:
 302         qd->qd_bh_count--;
 303         mutex_unlock(&sdp->sd_quota_mutex);
 304         return error;
 305 }
 306
 307 static void bh_put(struct gfs2_quota_data *qd)
 308 {
 309         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 310
 311         mutex_lock(&sdp->sd_quota_mutex);
 312         gfs2_assert(sdp, qd->qd_bh_count);
 313         if (!--qd->qd_bh_count) {
 314                 brelse(qd->qd_bh);
 315                 qd->qd_bh = NULL;
 316                 qd->qd_bh_qc = NULL;
 317         }
 318         mutex_unlock(&sdp->sd_quota_mutex);
 319 }
 320
 321 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 322 {
 323         struct gfs2_quota_data *qd = NULL;
 324         int error;
 325         int found = 0;
 326
 327         *qdp = NULL;
 328
 329         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 330                 return 0;
 331
 332         spin_lock(&sdp->sd_quota_spin);
 333
 334         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 335                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 336                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 337                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 338                         continue;
 339
 340                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 341
 342                 set_bit(QDF_LOCKED, &qd->qd_flags);
 343                 gfs2_assert_warn(sdp, qd->qd_count);
 344                 qd->qd_count++;
 345                 qd->qd_change_sync = qd->qd_change;
 346                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 347                 qd->qd_slot_count++;
 348                 found = 1;
 349
 350                 break;
 351         }
 352
 353         if (!found)
 354                 qd = NULL;
 355
 356         spin_unlock(&sdp->sd_quota_spin);
 357
 358         if (qd) {
 359                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 360                 error = bh_get(qd);
 361                 if (error) {
 362                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 363                         slot_put(qd);
 364                         qd_put(qd);
 365                         return error;
 366                 }
 367         }
 368
 369         *qdp = qd;
 370
 371         return 0;
 372 }
 373
 374 static int qd_trylock(struct gfs2_quota_data *qd)
 375 {
 376         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 377
 378         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 379                 return 0;
 380
 381         spin_lock(&sdp->sd_quota_spin);
 382
 383         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 384             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 385                 spin_unlock(&sdp->sd_quota_spin);
 386                 return 0;
 387         }
 388
 389         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 390
 391         set_bit(QDF_LOCKED, &qd->qd_flags);
 392         gfs2_assert_warn(sdp, qd->qd_count);
 393         qd->qd_count++;
 394         qd->qd_change_sync = qd->qd_change;
 395         gfs2_assert_warn(sdp, qd->qd_slot_count);
 396         qd->qd_slot_count++;
 397
 398         spin_unlock(&sdp->sd_quota_spin);
 399
 400         gfs2_assert_warn(sdp, qd->qd_change_sync);
 401         if (bh_get(qd)) {
 402                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 403                 slot_put(qd);
 404                 qd_put(qd);
 405                 return 0;
 406         }
 407
 408         return 1;
 409 }
 410
 411 static void qd_unlock(struct gfs2_quota_data *qd)
 412 {
 413         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 414                          test_bit(QDF_LOCKED, &qd->qd_flags));
 415         clear_bit(QDF_LOCKED, &qd->qd_flags);
 416         bh_put(qd);
 417         slot_put(qd);
 418         qd_put(qd);
 419 }
 420
 421 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 422                     struct gfs2_quota_data **qdp)
 423 {
 424         int error;
 425
 426         error = qd_get(sdp, user, id, create, qdp);
 427         if (error)
 428                 return error;
 429
 430         error = slot_get(*qdp);
 431         if (error)
 432                 goto fail;
 433
 434         error = bh_get(*qdp);
 435         if (error)
 436                 goto fail_slot;
 437
 438         return 0;
 439
 440 fail_slot:
 441         slot_put(*qdp);
 442 fail:
 443         qd_put(*qdp);
 444         return error;
 445 }
 446
 447 static void qdsb_put(struct gfs2_quota_data *qd)
 448 {
 449         bh_put(qd);
 450         slot_put(qd);
 451         qd_put(qd);
 452 }
 453
 454 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 455 {
 456         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 457         struct gfs2_alloc *al = &ip->i_alloc;
 458         struct gfs2_quota_data **qd = al->al_qd;
 459         int error;
 460
 461         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
 462             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 463                 return -EIO;
 464
 465         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 466                 return 0;
 467
 468         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
 469         if (error)
 470                 goto out;
 471         al->al_qd_num++;
 472         qd++;
 473
 474         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
 475         if (error)
 476                 goto out;
 477         al->al_qd_num++;
 478         qd++;
 479
 480         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 481                 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
 482                 if (error)
 483                         goto out;
 484                 al->al_qd_num++;
 485                 qd++;
 486         }
 487
 488         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 489                 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
 490                 if (error)
 491                         goto out;
 492                 al->al_qd_num++;
 493                 qd++;
 494         }
 495
 496 out:
 497         if (error)
 498                 gfs2_quota_unhold(ip);
 499         return error;
 500 }
 501
 502 void gfs2_quota_unhold(struct gfs2_inode *ip)
 503 {
 504         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 505         struct gfs2_alloc *al = &ip->i_alloc;
 506         unsigned int x;
 507
 508         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 509
 510         for (x = 0; x < al->al_qd_num; x++) {
 511                 qdsb_put(al->al_qd[x]);
 512                 al->al_qd[x] = NULL;
 513         }
 514         al->al_qd_num = 0;
 515 }
 516
 517 static int sort_qd(const void *a, const void *b)
 518 {
 519         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 520         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 521
 522         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 523             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 524                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 525                         return -1;
 526                 else
 527                         return 1;
 528         }
 529         if (qd_a->qd_id < qd_b->qd_id)
 530                 return -1;
 531         if (qd_a->qd_id > qd_b->qd_id)
 532                 return 1;
 533
 534         return 0;
 535 }
 536
 537 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 538 {
 539         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 540         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 541         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 542         s64 x;
 543
 544         mutex_lock(&sdp->sd_quota_mutex);
 545         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 546
 547         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 548                 qc->qc_change = 0;
 549                 qc->qc_flags = 0;
 550                 if (test_bit(QDF_USER, &qd->qd_flags))
 551                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 552                 qc->qc_id = cpu_to_be32(qd->qd_id);
 553         }
 554
 555         x = be64_to_cpu(qc->qc_change) + change;
 556         qc->qc_change = cpu_to_be64(x);
 557
 558         spin_lock(&sdp->sd_quota_spin);
 559         qd->qd_change = x;
 560         spin_unlock(&sdp->sd_quota_spin);
 561
 562         if (!x) {
 563                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 564                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 565                 qc->qc_flags = 0;
 566                 qc->qc_id = 0;
 567                 slot_put(qd);
 568                 qd_put(qd);
 569         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 570                 qd_hold(qd);
 571                 slot_hold(qd);
 572         }
 573
 574         mutex_unlock(&sdp->sd_quota_mutex);
 575 }
 576
 577 static void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf)
 578 {
 579         const struct gfs2_quota *str = buf;
 580
 581         qu->qu_limit = be64_to_cpu(str->qu_limit);
 582         qu->qu_warn = be64_to_cpu(str->qu_warn);
 583         qu->qu_value = be64_to_cpu(str->qu_value);
 584         qu->qu_ll_next = be32_to_cpu(str->qu_ll_next);
 585 }
 586
 587 static void gfs2_quota_out(const struct gfs2_quota_host *qu, void *buf)
 588 {
 589         struct gfs2_quota *str = buf;
 590
 591         str->qu_limit = cpu_to_be64(qu->qu_limit);
 592         str->qu_warn = cpu_to_be64(qu->qu_warn);
 593         str->qu_value = cpu_to_be64(qu->qu_value);
 594         str->qu_ll_next = cpu_to_be32(qu->qu_ll_next);
 595         memset(&str->qu_reserved, 0, sizeof(str->qu_reserved));
 596 }
 597
 598 /**
 599  * gfs2_adjust_quota
 600  *
 601  * This function was mostly borrowed from gfs2_block_truncate_page which was
 602  * in turn mostly borrowed from ext3
 603  */
 604 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 605                              s64 change, struct gfs2_quota_data *qd)
 606 {
 607         struct inode *inode = &ip->i_inode;
 608         struct address_space *mapping = inode->i_mapping;
 609         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 610         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 611         unsigned blocksize, iblock, pos;
 612         struct buffer_head *bh;
 613         struct page *page;
 614         void *kaddr;
 615         char *ptr;
 616         struct gfs2_quota_host qp;
 617         s64 value;
 618         int err = -EIO;
 619
 620         if (gfs2_is_stuffed(ip)) {
 621                 struct gfs2_alloc *al = NULL;
 622                 al = gfs2_alloc_get(ip);
 623                 /* just request 1 blk */
 624                 al->al_requested = 1;
 625                 gfs2_inplace_reserve(ip);
 626                 gfs2_unstuff_dinode(ip, NULL);
 627                 gfs2_inplace_release(ip);
 628                 gfs2_alloc_put(ip);
 629         }
 630         page = grab_cache_page(mapping, index);
 631         if (!page)
 632                 return -ENOMEM;
 633
 634         blocksize = inode->i_sb->s_blocksize;
 635         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 636
 637         if (!page_has_buffers(page))
 638                 create_empty_buffers(page, blocksize, 0);
 639
 640         bh = page_buffers(page);
 641         pos = blocksize;
 642         while (offset >= pos) {
 643                 bh = bh->b_this_page;
 644                 iblock++;
 645                 pos += blocksize;
 646         }
 647
 648         if (!buffer_mapped(bh)) {
 649                 gfs2_get_block(inode, iblock, bh, 1);
 650                 if (!buffer_mapped(bh))
 651                         goto unlock;
 652         }
 653
 654         if (PageUptodate(page))
 655                 set_buffer_uptodate(bh);
 656
 657         if (!buffer_uptodate(bh)) {
 658                 ll_rw_block(READ_META, 1, &bh);
 659                 wait_on_buffer(bh);
 660                 if (!buffer_uptodate(bh))
 661                         goto unlock;
 662         }
 663
 664         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 665
 666         kaddr = kmap_atomic(page, KM_USER0);
 667         ptr = kaddr + offset;
 668         gfs2_quota_in(&qp, ptr);
 669         qp.qu_value += change;
 670         value = qp.qu_value;
 671         gfs2_quota_out(&qp, ptr);
 672         flush_dcache_page(page);
 673         kunmap_atomic(kaddr, KM_USER0);
 674         err = 0;
 675         qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
 676         qd->qd_qb.qb_value = cpu_to_be64(value);
 677         ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_magic = cpu_to_be32(GFS2_MAGIC);
 678         ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_value = cpu_to_be64(value);
 679 unlock:
 680         unlock_page(page);
 681         page_cache_release(page);
 682         return err;
 683 }
 684
 685 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 686 {
 687         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 688         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 689         unsigned int data_blocks, ind_blocks;
 690         struct gfs2_holder *ghs, i_gh;
 691         unsigned int qx, x;
 692         struct gfs2_quota_data *qd;
 693         loff_t offset;
 694         unsigned int nalloc = 0;
 695         struct gfs2_alloc *al = NULL;
 696         int error;
 697
 698         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 699                               &data_blocks, &ind_blocks);
 700
 701         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_KERNEL);
 702         if (!ghs)
 703                 return -ENOMEM;
 704
 705         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 706         for (qx = 0; qx < num_qd; qx++) {
 707                 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
 708                                            LM_ST_EXCLUSIVE,
 709                                            GL_NOCACHE, &ghs[qx]);
 710                 if (error)
 711                         goto out;
 712         }
 713
 714         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 715         if (error)
 716                 goto out;
 717
 718         for (x = 0; x < num_qd; x++) {
 719                 int alloc_required;
 720
 721                 offset = qd2offset(qda[x]);
 722                 error = gfs2_write_alloc_required(ip, offset,
 723                                                   sizeof(struct gfs2_quota),
 724                                                   &alloc_required);
 725                 if (error)
 726                         goto out_gunlock;
 727                 if (alloc_required)
 728                         nalloc++;
 729         }
 730
 731         if (nalloc) {
 732                 al = gfs2_alloc_get(ip);
 733
 734                 al->al_requested = nalloc * (data_blocks + ind_blocks);
 735
 736                 error = gfs2_inplace_reserve(ip);
 737                 if (error)
 738                         goto out_alloc;
 739
 740                 error = gfs2_trans_begin(sdp,
 741                                          al->al_rgd->rd_length +
 742                                          num_qd * data_blocks +
 743                                          nalloc * ind_blocks +
 744                                          RES_DINODE + num_qd +
 745                                          RES_STATFS, 0);
 746                 if (error)
 747                         goto out_ipres;
 748         } else {
 749                 error = gfs2_trans_begin(sdp,
 750                                          num_qd * data_blocks +
 751                                          RES_DINODE + num_qd, 0);
 752                 if (error)
 753                         goto out_gunlock;
 754         }
 755
 756         for (x = 0; x < num_qd; x++) {
 757                 qd = qda[x];
 758                 offset = qd2offset(qd);
 759                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
 760                                           (struct gfs2_quota_data *)
 761                                           qd);
 762                 if (error)
 763                         goto out_end_trans;
 764
 765                 do_qc(qd, -qd->qd_change_sync);
 766         }
 767
 768         error = 0;
 769
 770 out_end_trans:
 771         gfs2_trans_end(sdp);
 772 out_ipres:
 773         if (nalloc)
 774                 gfs2_inplace_release(ip);
 775 out_alloc:
 776         if (nalloc)
 777                 gfs2_alloc_put(ip);
 778 out_gunlock:
 779         gfs2_glock_dq_uninit(&i_gh);
 780 out:
 781         while (qx--)
 782                 gfs2_glock_dq_uninit(&ghs[qx]);
 783         kfree(ghs);
 784         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 785         return error;
 786 }
 787
 788 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 789                     struct gfs2_holder *q_gh)
 790 {
 791         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 792         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 793         struct gfs2_holder i_gh;
 794         struct gfs2_quota_host q;
 795         char buf[sizeof(struct gfs2_quota)];
 796         struct file_ra_state ra_state;
 797         int error;
 798         struct gfs2_quota_lvb *qlvb;
 799
 800         file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
 801 restart:
 802         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 803         if (error)
 804                 return error;
 805
 806         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 807
 808         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 809                 loff_t pos;
 810                 gfs2_glock_dq_uninit(q_gh);
 811                 error = gfs2_glock_nq_init(qd->qd_gl,
 812                                           LM_ST_EXCLUSIVE, GL_NOCACHE,
 813                                           q_gh);
 814                 if (error)
 815                         return error;
 816
 817                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 818                 if (error)
 819                         goto fail;
 820
 821                 memset(buf, 0, sizeof(struct gfs2_quota));
 822                 pos = qd2offset(qd);
 823                 error = gfs2_internal_read(ip, &ra_state, buf,
 824                                            &pos, sizeof(struct gfs2_quota));
 825                 if (error < 0)
 826                         goto fail_gunlock;
 827
 828                 gfs2_glock_dq_uninit(&i_gh);
 829
 830
 831                 gfs2_quota_in(&q, buf);
 832                 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 833                 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 834                 qlvb->__pad = 0;
 835                 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
 836                 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
 837                 qlvb->qb_value = cpu_to_be64(q.qu_value);
 838                 qd->qd_qb = *qlvb;
 839
 840                 if (gfs2_glock_is_blocking(qd->qd_gl)) {
 841                         gfs2_glock_dq_uninit(q_gh);
 842                         force_refresh = 0;
 843                         goto restart;
 844                 }
 845         }
 846
 847         return 0;
 848
 849 fail_gunlock:
 850         gfs2_glock_dq_uninit(&i_gh);
 851 fail:
 852         gfs2_glock_dq_uninit(q_gh);
 853         return error;
 854 }
 855
 856 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 857 {
 858         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 859         struct gfs2_alloc *al = &ip->i_alloc;
 860         unsigned int x;
 861         int error = 0;
 862
 863         gfs2_quota_hold(ip, uid, gid);
 864
 865         if (capable(CAP_SYS_RESOURCE) ||
 866             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 867                 return 0;
 868
 869         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 870              sort_qd, NULL);
 871
 872         for (x = 0; x < al->al_qd_num; x++) {
 873                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 874                 if (error)
 875                         break;
 876         }
 877
 878         if (!error)
 879                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 880         else {
 881                 while (x--)
 882                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 883                 gfs2_quota_unhold(ip);
 884         }
 885
 886         return error;
 887 }
 888
 889 static int need_sync(struct gfs2_quota_data *qd)
 890 {
 891         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 892         struct gfs2_tune *gt = &sdp->sd_tune;
 893         s64 value;
 894         unsigned int num, den;
 895         int do_sync = 1;
 896
 897         if (!qd->qd_qb.qb_limit)
 898                 return 0;
 899
 900         spin_lock(&sdp->sd_quota_spin);
 901         value = qd->qd_change;
 902         spin_unlock(&sdp->sd_quota_spin);
 903
 904         spin_lock(&gt->gt_spin);
 905         num = gt->gt_quota_scale_num;
 906         den = gt->gt_quota_scale_den;
 907         spin_unlock(&gt->gt_spin);
 908
 909         if (value < 0)
 910                 do_sync = 0;
 911         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 912                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 913                 do_sync = 0;
 914         else {
 915                 value *= gfs2_jindex_size(sdp) * num;
 916                 do_div(value, den);
 917                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 918                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 919                         do_sync = 0;
 920         }
 921
 922         return do_sync;
 923 }
 924
 925 void gfs2_quota_unlock(struct gfs2_inode *ip)
 926 {
 927         struct gfs2_alloc *al = &ip->i_alloc;
 928         struct gfs2_quota_data *qda[4];
 929         unsigned int count = 0;
 930         unsigned int x;
 931
 932         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
 933                 goto out;
 934
 935         for (x = 0; x < al->al_qd_num; x++) {
 936                 struct gfs2_quota_data *qd;
 937                 int sync;
 938
 939                 qd = al->al_qd[x];
 940                 sync = need_sync(qd);
 941
 942                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 943
 944                 if (sync && qd_trylock(qd))
 945                         qda[count++] = qd;
 946         }
 947
 948         if (count) {
 949                 do_sync(count, qda);
 950                 for (x = 0; x < count; x++)
 951                         qd_unlock(qda[x]);
 952         }
 953
 954 out:
 955         gfs2_quota_unhold(ip);
 956 }
 957
 958 #define MAX_LINE 256
 959
 960 static int print_message(struct gfs2_quota_data *qd, char *type)
 961 {
 962         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 963
 964         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
 965                sdp->sd_fsname, type,
 966                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
 967                qd->qd_id);
 968
 969         return 0;
 970 }
 971
 972 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 973 {
 974         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 975         struct gfs2_alloc *al = &ip->i_alloc;
 976         struct gfs2_quota_data *qd;
 977         s64 value;
 978         unsigned int x;
 979         int error = 0;
 980
 981         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
 982                 return 0;
 983
 984         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 985                 return 0;
 986
 987         for (x = 0; x < al->al_qd_num; x++) {
 988                 qd = al->al_qd[x];
 989
 990                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 991                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
 992                         continue;
 993
 994                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
 995                 spin_lock(&sdp->sd_quota_spin);
 996                 value += qd->qd_change;
 997                 spin_unlock(&sdp->sd_quota_spin);
 998
 999                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1000                         print_message(qd, "exceeded");
1001                         error = -EDQUOT;
1002                         break;
1003                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1004                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1005                            time_after_eq(jiffies, qd->qd_last_warn +
1006                                          gfs2_tune_get(sdp,
1007                                                 gt_quota_warn_period) * HZ)) {
1008                         error = print_message(qd, "warning");
1009                         qd->qd_last_warn = jiffies;
1010                 }
1011         }
1012
1013         return error;
1014 }
1015
1016 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1017                        u32 uid, u32 gid)
1018 {
1019         struct gfs2_alloc *al = &ip->i_alloc;
1020         struct gfs2_quota_data *qd;
1021         unsigned int x;
1022         unsigned int found = 0;
1023
1024         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1025                 return;
1026         if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
1027                 return;
1028
1029         for (x = 0; x < al->al_qd_num; x++) {
1030                 qd = al->al_qd[x];
1031
1032                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1033                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1034                         do_qc(qd, change);
1035                         found++;
1036                 }
1037         }
1038 }
1039
1040 int gfs2_quota_sync(struct gfs2_sbd *sdp)
1041 {
1042         struct gfs2_quota_data **qda;
1043         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1044         unsigned int num_qd;
1045         unsigned int x;
1046         int error = 0;
1047
1048         sdp->sd_quota_sync_gen++;
1049
1050         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1051         if (!qda)
1052                 return -ENOMEM;
1053
1054         do {
1055                 num_qd = 0;
1056
1057                 for (;;) {
1058                         error = qd_fish(sdp, qda + num_qd);
1059                         if (error || !qda[num_qd])
1060                                 break;
1061                         if (++num_qd == max_qd)
1062                                 break;
1063                 }
1064
1065                 if (num_qd) {
1066                         if (!error)
1067                                 error = do_sync(num_qd, qda);
1068                         if (!error)
1069                                 for (x = 0; x < num_qd; x++)
1070                                         qda[x]->qd_sync_gen =
1071                                                 sdp->sd_quota_sync_gen;
1072
1073                         for (x = 0; x < num_qd; x++)
1074                                 qd_unlock(qda[x]);
1075                 }
1076         } while (!error && num_qd == max_qd);
1077
1078         kfree(qda);
1079
1080         return error;
1081 }
1082
1083 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1084 {
1085         struct gfs2_quota_data *qd;
1086         struct gfs2_holder q_gh;
1087         int error;
1088
1089         error = qd_get(sdp, user, id, CREATE, &qd);
1090         if (error)
1091                 return error;
1092
1093         error = do_glock(qd, FORCE, &q_gh);
1094         if (!error)
1095                 gfs2_glock_dq_uninit(&q_gh);
1096
1097         qd_put(qd);
1098
1099         return error;
1100 }
1101
1102 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1103 {
1104         const struct gfs2_quota_change *str = buf;
1105
1106         qc->qc_change = be64_to_cpu(str->qc_change);
1107         qc->qc_flags = be32_to_cpu(str->qc_flags);
1108         qc->qc_id = be32_to_cpu(str->qc_id);
1109 }
1110
1111 int gfs2_quota_init(struct gfs2_sbd *sdp)
1112 {
1113         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1114         unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
1115         unsigned int x, slot = 0;
1116         unsigned int found = 0;
1117         u64 dblock;
1118         u32 extlen = 0;
1119         int error;
1120
1121         if (!ip->i_di.di_size || ip->i_di.di_size > (64 << 20) ||
1122             ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
1123                 gfs2_consist_inode(ip);
1124                 return -EIO;
1125         }
1126         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1127         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1128
1129         error = -ENOMEM;
1130
1131         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1132                                        sizeof(unsigned char *), GFP_KERNEL);
1133         if (!sdp->sd_quota_bitmap)
1134                 return error;
1135
1136         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1137                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_KERNEL);
1138                 if (!sdp->sd_quota_bitmap[x])
1139                         goto fail;
1140         }
1141
1142         for (x = 0; x < blocks; x++) {
1143                 struct buffer_head *bh;
1144                 unsigned int y;
1145
1146                 if (!extlen) {
1147                         int new = 0;
1148                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1149                         if (error)
1150                                 goto fail;
1151                 }
1152                 error = -EIO;
1153                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1154                 if (!bh)
1155                         goto fail;
1156                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1157                         brelse(bh);
1158                         goto fail;
1159                 }
1160
1161                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1162                      y++, slot++) {
1163                         struct gfs2_quota_change_host qc;
1164                         struct gfs2_quota_data *qd;
1165
1166                         gfs2_quota_change_in(&qc, bh->b_data +
1167                                           sizeof(struct gfs2_meta_header) +
1168                                           y * sizeof(struct gfs2_quota_change));
1169                         if (!qc.qc_change)
1170                                 continue;
1171
1172                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1173                                          qc.qc_id, &qd);
1174                         if (error) {
1175                                 brelse(bh);
1176                                 goto fail;
1177                         }
1178
1179                         set_bit(QDF_CHANGE, &qd->qd_flags);
1180                         qd->qd_change = qc.qc_change;
1181                         qd->qd_slot = slot;
1182                         qd->qd_slot_count = 1;
1183                         qd->qd_last_touched = jiffies;
1184
1185                         spin_lock(&sdp->sd_quota_spin);
1186                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1187                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1188                         atomic_inc(&sdp->sd_quota_count);
1189                         spin_unlock(&sdp->sd_quota_spin);
1190
1191                         found++;
1192                 }
1193
1194                 brelse(bh);
1195                 dblock++;
1196                 extlen--;
1197         }
1198
1199         if (found)
1200                 fs_info(sdp, "found %u quota changes\n", found);
1201
1202         return 0;
1203
1204 fail:
1205         gfs2_quota_cleanup(sdp);
1206         return error;
1207 }
1208
1209 void gfs2_quota_scan(struct gfs2_sbd *sdp)
1210 {
1211         struct gfs2_quota_data *qd, *safe;
1212         LIST_HEAD(dead);
1213
1214         spin_lock(&sdp->sd_quota_spin);
1215         list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1216                 if (!qd->qd_count &&
1217                     time_after_eq(jiffies, qd->qd_last_touched +
1218                                 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1219                         list_move(&qd->qd_list, &dead);
1220                         gfs2_assert_warn(sdp,
1221                                          atomic_read(&sdp->sd_quota_count) > 0);
1222                         atomic_dec(&sdp->sd_quota_count);
1223                 }
1224         }
1225         spin_unlock(&sdp->sd_quota_spin);
1226
1227         while (!list_empty(&dead)) {
1228                 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1229                 list_del(&qd->qd_list);
1230
1231                 gfs2_assert_warn(sdp, !qd->qd_change);
1232                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1233                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1234
1235                 gfs2_lvb_unhold(qd->qd_gl);
1236                 kfree(qd);
1237         }
1238 }
1239
1240 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1241 {
1242         struct list_head *head = &sdp->sd_quota_list;
1243         struct gfs2_quota_data *qd;
1244         unsigned int x;
1245
1246         spin_lock(&sdp->sd_quota_spin);
1247         while (!list_empty(head)) {
1248                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1249
1250                 if (qd->qd_count > 1 ||
1251                     (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1252                         list_move(&qd->qd_list, head);
1253                         spin_unlock(&sdp->sd_quota_spin);
1254                         schedule();
1255                         spin_lock(&sdp->sd_quota_spin);
1256                         continue;
1257                 }
1258
1259                 list_del(&qd->qd_list);
1260                 atomic_dec(&sdp->sd_quota_count);
1261                 spin_unlock(&sdp->sd_quota_spin);
1262
1263                 if (!qd->qd_count) {
1264                         gfs2_assert_warn(sdp, !qd->qd_change);
1265                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1266                 } else
1267                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1268                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1269
1270                 gfs2_lvb_unhold(qd->qd_gl);
1271                 kfree(qd);
1272
1273                 spin_lock(&sdp->sd_quota_spin);
1274         }
1275         spin_unlock(&sdp->sd_quota_spin);
1276
1277         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1278
1279         if (sdp->sd_quota_bitmap) {
1280                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1281                         kfree(sdp->sd_quota_bitmap[x]);
1282                 kfree(sdp->sd_quota_bitmap);
1283         }
1284 }
1285