err.no Git - linux-2.6/blob - 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 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_address.h"
  63 #include "util.h"
  64
  65 #define QUOTA_USER 1
  66 #define QUOTA_GROUP 0
  67
  68 struct gfs2_quota_host {
  69         u64 qu_limit;
  70         u64 qu_warn;
  71         s64 qu_value;
  72         u32 qu_ll_next;
  73 };
  74
  75 struct gfs2_quota_change_host {
  76         u64 qc_change;
  77         u32 qc_flags; /* GFS2_QCF_... */
  78         u32 qc_id;
  79 };
  80
  81 static u64 qd2offset(struct gfs2_quota_data *qd)
  82 {
  83         u64 offset;
  84
  85         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
  86         offset *= sizeof(struct gfs2_quota);
  87
  88         return offset;
  89 }
  90
  91 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
  92                     struct gfs2_quota_data **qdp)
  93 {
  94         struct gfs2_quota_data *qd;
  95         int error;
  96
  97         qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
  98         if (!qd)
  99                 return -ENOMEM;
 100
 101         qd->qd_count = 1;
 102         qd->qd_id = id;
 103         if (user)
 104                 set_bit(QDF_USER, &qd->qd_flags);
 105         qd->qd_slot = -1;
 106
 107         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
 108                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 109         if (error)
 110                 goto fail;
 111
 112         error = gfs2_lvb_hold(qd->qd_gl);
 113         gfs2_glock_put(qd->qd_gl);
 114         if (error)
 115                 goto fail;
 116
 117         *qdp = qd;
 118
 119         return 0;
 120
 121 fail:
 122         kfree(qd);
 123         return error;
 124 }
 125
 126 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 127                   struct gfs2_quota_data **qdp)
 128 {
 129         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 130         int error, found;
 131
 132         *qdp = NULL;
 133
 134         for (;;) {
 135                 found = 0;
 136                 spin_lock(&sdp->sd_quota_spin);
 137                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 138                         if (qd->qd_id == id &&
 139                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 140                                 qd->qd_count++;
 141                                 found = 1;
 142                                 break;
 143                         }
 144                 }
 145
 146                 if (!found)
 147                         qd = NULL;
 148
 149                 if (!qd && new_qd) {
 150                         qd = new_qd;
 151                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 152                         atomic_inc(&sdp->sd_quota_count);
 153                         new_qd = NULL;
 154                 }
 155
 156                 spin_unlock(&sdp->sd_quota_spin);
 157
 158                 if (qd || !create) {
 159                         if (new_qd) {
 160                                 gfs2_lvb_unhold(new_qd->qd_gl);
 161                                 kfree(new_qd);
 162                         }
 163                         *qdp = qd;
 164                         return 0;
 165                 }
 166
 167                 error = qd_alloc(sdp, user, id, &new_qd);
 168                 if (error)
 169                         return error;
 170         }
 171 }
 172
 173 static void qd_hold(struct gfs2_quota_data *qd)
 174 {
 175         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 176
 177         spin_lock(&sdp->sd_quota_spin);
 178         gfs2_assert(sdp, qd->qd_count);
 179         qd->qd_count++;
 180         spin_unlock(&sdp->sd_quota_spin);
 181 }
 182
 183 static void qd_put(struct gfs2_quota_data *qd)
 184 {
 185         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 186         spin_lock(&sdp->sd_quota_spin);
 187         gfs2_assert(sdp, qd->qd_count);
 188         if (!--qd->qd_count)
 189                 qd->qd_last_touched = jiffies;
 190         spin_unlock(&sdp->sd_quota_spin);
 191 }
 192
 193 static int slot_get(struct gfs2_quota_data *qd)
 194 {
 195         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 196         unsigned int c, o = 0, b;
 197         unsigned char byte = 0;
 198
 199         spin_lock(&sdp->sd_quota_spin);
 200
 201         if (qd->qd_slot_count++) {
 202                 spin_unlock(&sdp->sd_quota_spin);
 203                 return 0;
 204         }
 205
 206         for (c = 0; c < sdp->sd_quota_chunks; c++)
 207                 for (o = 0; o < PAGE_SIZE; o++) {
 208                         byte = sdp->sd_quota_bitmap[c][o];
 209                         if (byte != 0xFF)
 210                                 goto found;
 211                 }
 212
 213         goto fail;
 214
 215 found:
 216         for (b = 0; b < 8; b++)
 217                 if (!(byte & (1 << b)))
 218                         break;
 219         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 220
 221         if (qd->qd_slot >= sdp->sd_quota_slots)
 222                 goto fail;
 223
 224         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 225
 226         spin_unlock(&sdp->sd_quota_spin);
 227
 228         return 0;
 229
 230 fail:
 231         qd->qd_slot_count--;
 232         spin_unlock(&sdp->sd_quota_spin);
 233         return -ENOSPC;
 234 }
 235
 236 static void slot_hold(struct gfs2_quota_data *qd)
 237 {
 238         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 239
 240         spin_lock(&sdp->sd_quota_spin);
 241         gfs2_assert(sdp, qd->qd_slot_count);
 242         qd->qd_slot_count++;
 243         spin_unlock(&sdp->sd_quota_spin);
 244 }
 245
 246 static void slot_put(struct gfs2_quota_data *qd)
 247 {
 248         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 249
 250         spin_lock(&sdp->sd_quota_spin);
 251         gfs2_assert(sdp, qd->qd_slot_count);
 252         if (!--qd->qd_slot_count) {
 253                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 254                 qd->qd_slot = -1;
 255         }
 256         spin_unlock(&sdp->sd_quota_spin);
 257 }
 258
 259 static int bh_get(struct gfs2_quota_data *qd)
 260 {
 261         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 262         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 263         unsigned int block, offset;
 264         struct buffer_head *bh;
 265         int error;
 266         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 267
 268         mutex_lock(&sdp->sd_quota_mutex);
 269
 270         if (qd->qd_bh_count++) {
 271                 mutex_unlock(&sdp->sd_quota_mutex);
 272                 return 0;
 273         }
 274
 275         block = qd->qd_slot / sdp->sd_qc_per_block;
 276         offset = qd->qd_slot % sdp->sd_qc_per_block;
 277
 278         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 279         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 280         if (error)
 281                 goto fail;
 282         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 283         if (error)
 284                 goto fail;
 285         error = -EIO;
 286         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 287                 goto fail_brelse;
 288
 289         qd->qd_bh = bh;
 290         qd->qd_bh_qc = (struct gfs2_quota_change *)
 291                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 292                  offset * sizeof(struct gfs2_quota_change));
 293
 294         mutex_unlock(&sdp->sd_quota_mutex);
 295
 296         return 0;
 297
 298 fail_brelse:
 299         brelse(bh);
 300 fail:
 301         qd->qd_bh_count--;
 302         mutex_unlock(&sdp->sd_quota_mutex);
 303         return error;
 304 }
 305
 306 static void bh_put(struct gfs2_quota_data *qd)
 307 {
 308         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 309
 310         mutex_lock(&sdp->sd_quota_mutex);
 311         gfs2_assert(sdp, qd->qd_bh_count);
 312         if (!--qd->qd_bh_count) {
 313                 brelse(qd->qd_bh);
 314                 qd->qd_bh = NULL;
 315                 qd->qd_bh_qc = NULL;
 316         }
 317         mutex_unlock(&sdp->sd_quota_mutex);
 318 }
 319
 320 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 321 {
 322         struct gfs2_quota_data *qd = NULL;
 323         int error;
 324         int found = 0;
 325
 326         *qdp = NULL;
 327
 328         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 329                 return 0;
 330
 331         spin_lock(&sdp->sd_quota_spin);
 332
 333         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 334                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 335                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 336                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 337                         continue;
 338
 339                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 340
 341                 set_bit(QDF_LOCKED, &qd->qd_flags);
 342                 gfs2_assert_warn(sdp, qd->qd_count);
 343                 qd->qd_count++;
 344                 qd->qd_change_sync = qd->qd_change;
 345                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 346                 qd->qd_slot_count++;
 347                 found = 1;
 348
 349                 break;
 350         }
 351
 352         if (!found)
 353                 qd = NULL;
 354
 355         spin_unlock(&sdp->sd_quota_spin);
 356
 357         if (qd) {
 358                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 359                 error = bh_get(qd);
 360                 if (error) {
 361                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 362                         slot_put(qd);
 363                         qd_put(qd);
 364                         return error;
 365                 }
 366         }
 367
 368         *qdp = qd;
 369
 370         return 0;
 371 }
 372
 373 static int qd_trylock(struct gfs2_quota_data *qd)
 374 {
 375         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 376
 377         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 378                 return 0;
 379
 380         spin_lock(&sdp->sd_quota_spin);
 381
 382         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 383             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 384                 spin_unlock(&sdp->sd_quota_spin);
 385                 return 0;
 386         }
 387
 388         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 389
 390         set_bit(QDF_LOCKED, &qd->qd_flags);
 391         gfs2_assert_warn(sdp, qd->qd_count);
 392         qd->qd_count++;
 393         qd->qd_change_sync = qd->qd_change;
 394         gfs2_assert_warn(sdp, qd->qd_slot_count);
 395         qd->qd_slot_count++;
 396
 397         spin_unlock(&sdp->sd_quota_spin);
 398
 399         gfs2_assert_warn(sdp, qd->qd_change_sync);
 400         if (bh_get(qd)) {
 401                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 402                 slot_put(qd);
 403                 qd_put(qd);
 404                 return 0;
 405         }
 406
 407         return 1;
 408 }
 409
 410 static void qd_unlock(struct gfs2_quota_data *qd)
 411 {
 412         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 413                          test_bit(QDF_LOCKED, &qd->qd_flags));
 414         clear_bit(QDF_LOCKED, &qd->qd_flags);
 415         bh_put(qd);
 416         slot_put(qd);
 417         qd_put(qd);
 418 }
 419
 420 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 421                     struct gfs2_quota_data **qdp)
 422 {
 423         int error;
 424
 425         error = qd_get(sdp, user, id, create, qdp);
 426         if (error)
 427                 return error;
 428
 429         error = slot_get(*qdp);
 430         if (error)
 431                 goto fail;
 432
 433         error = bh_get(*qdp);
 434         if (error)
 435                 goto fail_slot;
 436
 437         return 0;
 438
 439 fail_slot:
 440         slot_put(*qdp);
 441 fail:
 442         qd_put(*qdp);
 443         return error;
 444 }
 445
 446 static void qdsb_put(struct gfs2_quota_data *qd)
 447 {
 448         bh_put(qd);
 449         slot_put(qd);
 450         qd_put(qd);
 451 }
 452
 453 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 454 {
 455         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 456         struct gfs2_alloc *al = ip->i_alloc;
 457         struct gfs2_quota_data **qd = al->al_qd;
 458         int error;
 459
 460         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
 461             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 462                 return -EIO;
 463
 464         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 465                 return 0;
 466
 467         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
 468         if (error)
 469                 goto out;
 470         al->al_qd_num++;
 471         qd++;
 472
 473         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
 474         if (error)
 475                 goto out;
 476         al->al_qd_num++;
 477         qd++;
 478
 479         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 480                 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
 481                 if (error)
 482                         goto out;
 483                 al->al_qd_num++;
 484                 qd++;
 485         }
 486
 487         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 488                 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
 489                 if (error)
 490                         goto out;
 491                 al->al_qd_num++;
 492                 qd++;
 493         }
 494
 495 out:
 496         if (error)
 497                 gfs2_quota_unhold(ip);
 498         return error;
 499 }
 500
 501 void gfs2_quota_unhold(struct gfs2_inode *ip)
 502 {
 503         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 504         struct gfs2_alloc *al = ip->i_alloc;
 505         unsigned int x;
 506
 507         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 508
 509         for (x = 0; x < al->al_qd_num; x++) {
 510                 qdsb_put(al->al_qd[x]);
 511                 al->al_qd[x] = NULL;
 512         }
 513         al->al_qd_num = 0;
 514 }
 515
 516 static int sort_qd(const void *a, const void *b)
 517 {
 518         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 519         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 520
 521         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 522             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 523                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 524                         return -1;
 525                 else
 526                         return 1;
 527         }
 528         if (qd_a->qd_id < qd_b->qd_id)
 529                 return -1;
 530         if (qd_a->qd_id > qd_b->qd_id)
 531                 return 1;
 532
 533         return 0;
 534 }
 535
 536 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 537 {
 538         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 539         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 540         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 541         s64 x;
 542
 543         mutex_lock(&sdp->sd_quota_mutex);
 544         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 545
 546         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 547                 qc->qc_change = 0;
 548                 qc->qc_flags = 0;
 549                 if (test_bit(QDF_USER, &qd->qd_flags))
 550                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 551                 qc->qc_id = cpu_to_be32(qd->qd_id);
 552         }
 553
 554         x = be64_to_cpu(qc->qc_change) + change;
 555         qc->qc_change = cpu_to_be64(x);
 556
 557         spin_lock(&sdp->sd_quota_spin);
 558         qd->qd_change = x;
 559         spin_unlock(&sdp->sd_quota_spin);
 560
 561         if (!x) {
 562                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 563                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 564                 qc->qc_flags = 0;
 565                 qc->qc_id = 0;
 566                 slot_put(qd);
 567                 qd_put(qd);
 568         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 569                 qd_hold(qd);
 570                 slot_hold(qd);
 571         }
 572
 573         mutex_unlock(&sdp->sd_quota_mutex);
 574 }
 575
 576 static void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf)
 577 {
 578         const struct gfs2_quota *str = buf;
 579
 580         qu->qu_limit = be64_to_cpu(str->qu_limit);
 581         qu->qu_warn = be64_to_cpu(str->qu_warn);
 582         qu->qu_value = be64_to_cpu(str->qu_value);
 583         qu->qu_ll_next = be32_to_cpu(str->qu_ll_next);
 584 }
 585
 586 static void gfs2_quota_out(const struct gfs2_quota_host *qu, void *buf)
 587 {
 588         struct gfs2_quota *str = buf;
 589
 590         str->qu_limit = cpu_to_be64(qu->qu_limit);
 591         str->qu_warn = cpu_to_be64(qu->qu_warn);
 592         str->qu_value = cpu_to_be64(qu->qu_value);
 593         str->qu_ll_next = cpu_to_be32(qu->qu_ll_next);
 594         memset(&str->qu_reserved, 0, sizeof(str->qu_reserved));
 595 }
 596
 597 /**
 598  * gfs2_adjust_quota
 599  *
 600  * This function was mostly borrowed from gfs2_block_truncate_page which was
 601  * in turn mostly borrowed from ext3
 602  */
 603 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 604                              s64 change, struct gfs2_quota_data *qd)
 605 {
 606         struct inode *inode = &ip->i_inode;
 607         struct address_space *mapping = inode->i_mapping;
 608         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 609         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 610         unsigned blocksize, iblock, pos;
 611         struct buffer_head *bh;
 612         struct page *page;
 613         void *kaddr;
 614         char *ptr;
 615         struct gfs2_quota_host qp;
 616         s64 value;
 617         int err = -EIO;
 618
 619         if (gfs2_is_stuffed(ip)) {
 620                 struct gfs2_alloc *al = gfs2_alloc_get(ip);
 621                 if (!al)
 622                         return -ENOMEM;
 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_block_map(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                 if (!al) {
 734                         error = -ENOMEM;
 735                         goto out_gunlock;
 736                 }
 737
 738                 al->al_requested = nalloc * (data_blocks + ind_blocks);
 739
 740                 error = gfs2_inplace_reserve(ip);
 741                 if (error)
 742                         goto out_alloc;
 743
 744                 error = gfs2_trans_begin(sdp,
 745                                          al->al_rgd->rd_length +
 746                                          num_qd * data_blocks +
 747                                          nalloc * ind_blocks +
 748                                          RES_DINODE + num_qd +
 749                                          RES_STATFS, 0);
 750                 if (error)
 751                         goto out_ipres;
 752         } else {
 753                 error = gfs2_trans_begin(sdp,
 754                                          num_qd * data_blocks +
 755                                          RES_DINODE + num_qd, 0);
 756                 if (error)
 757                         goto out_gunlock;
 758         }
 759
 760         for (x = 0; x < num_qd; x++) {
 761                 qd = qda[x];
 762                 offset = qd2offset(qd);
 763                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
 764                                           (struct gfs2_quota_data *)
 765                                           qd);
 766                 if (error)
 767                         goto out_end_trans;
 768
 769                 do_qc(qd, -qd->qd_change_sync);
 770         }
 771
 772         error = 0;
 773
 774 out_end_trans:
 775         gfs2_trans_end(sdp);
 776 out_ipres:
 777         if (nalloc)
 778                 gfs2_inplace_release(ip);
 779 out_alloc:
 780         if (nalloc)
 781                 gfs2_alloc_put(ip);
 782 out_gunlock:
 783         gfs2_glock_dq_uninit(&i_gh);
 784 out:
 785         while (qx--)
 786                 gfs2_glock_dq_uninit(&ghs[qx]);
 787         kfree(ghs);
 788         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 789         return error;
 790 }
 791
 792 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 793                     struct gfs2_holder *q_gh)
 794 {
 795         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 796         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 797         struct gfs2_holder i_gh;
 798         struct gfs2_quota_host q;
 799         char buf[sizeof(struct gfs2_quota)];
 800         int error;
 801         struct gfs2_quota_lvb *qlvb;
 802
 803 restart:
 804         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 805         if (error)
 806                 return error;
 807
 808         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 809
 810         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 811                 loff_t pos;
 812                 gfs2_glock_dq_uninit(q_gh);
 813                 error = gfs2_glock_nq_init(qd->qd_gl,
 814                                           LM_ST_EXCLUSIVE, GL_NOCACHE,
 815                                           q_gh);
 816                 if (error)
 817                         return error;
 818
 819                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 820                 if (error)
 821                         goto fail;
 822
 823                 memset(buf, 0, sizeof(struct gfs2_quota));
 824                 pos = qd2offset(qd);
 825                 error = gfs2_internal_read(ip, NULL, buf, &pos,
 826                                            sizeof(struct gfs2_quota));
 827                 if (error < 0)
 828                         goto fail_gunlock;
 829
 830                 gfs2_glock_dq_uninit(&i_gh);
 831
 832
 833                 gfs2_quota_in(&q, buf);
 834                 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 835                 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 836                 qlvb->__pad = 0;
 837                 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
 838                 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
 839                 qlvb->qb_value = cpu_to_be64(q.qu_value);
 840                 qd->qd_qb = *qlvb;
 841
 842                 if (gfs2_glock_is_blocking(qd->qd_gl)) {
 843                         gfs2_glock_dq_uninit(q_gh);
 844                         force_refresh = 0;
 845                         goto restart;
 846                 }
 847         }
 848
 849         return 0;
 850
 851 fail_gunlock:
 852         gfs2_glock_dq_uninit(&i_gh);
 853 fail:
 854         gfs2_glock_dq_uninit(q_gh);
 855         return error;
 856 }
 857
 858 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 859 {
 860         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 861         struct gfs2_alloc *al = ip->i_alloc;
 862         unsigned int x;
 863         int error = 0;
 864
 865         gfs2_quota_hold(ip, uid, gid);
 866
 867         if (capable(CAP_SYS_RESOURCE) ||
 868             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 869                 return 0;
 870
 871         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 872              sort_qd, NULL);
 873
 874         for (x = 0; x < al->al_qd_num; x++) {
 875                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 876                 if (error)
 877                         break;
 878         }
 879
 880         if (!error)
 881                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 882         else {
 883                 while (x--)
 884                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 885                 gfs2_quota_unhold(ip);
 886         }
 887
 888         return error;
 889 }
 890
 891 static int need_sync(struct gfs2_quota_data *qd)
 892 {
 893         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 894         struct gfs2_tune *gt = &sdp->sd_tune;
 895         s64 value;
 896         unsigned int num, den;
 897         int do_sync = 1;
 898
 899         if (!qd->qd_qb.qb_limit)
 900                 return 0;
 901
 902         spin_lock(&sdp->sd_quota_spin);
 903         value = qd->qd_change;
 904         spin_unlock(&sdp->sd_quota_spin);
 905
 906         spin_lock(&gt->gt_spin);
 907         num = gt->gt_quota_scale_num;
 908         den = gt->gt_quota_scale_den;
 909         spin_unlock(&gt->gt_spin);
 910
 911         if (value < 0)
 912                 do_sync = 0;
 913         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 914                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 915                 do_sync = 0;
 916         else {
 917                 value *= gfs2_jindex_size(sdp) * num;
 918                 do_div(value, den);
 919                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 920                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 921                         do_sync = 0;
 922         }
 923
 924         return do_sync;
 925 }
 926
 927 void gfs2_quota_unlock(struct gfs2_inode *ip)
 928 {
 929         struct gfs2_alloc *al = ip->i_alloc;
 930         struct gfs2_quota_data *qda[4];
 931         unsigned int count = 0;
 932         unsigned int x;
 933
 934         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
 935                 goto out;
 936
 937         for (x = 0; x < al->al_qd_num; x++) {
 938                 struct gfs2_quota_data *qd;
 939                 int sync;
 940
 941                 qd = al->al_qd[x];
 942                 sync = need_sync(qd);
 943
 944                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 945
 946                 if (sync && qd_trylock(qd))
 947                         qda[count++] = qd;
 948         }
 949
 950         if (count) {
 951                 do_sync(count, qda);
 952                 for (x = 0; x < count; x++)
 953                         qd_unlock(qda[x]);
 954         }
 955
 956 out:
 957         gfs2_quota_unhold(ip);
 958 }
 959
 960 #define MAX_LINE 256
 961
 962 static int print_message(struct gfs2_quota_data *qd, char *type)
 963 {
 964         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 965
 966         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
 967                sdp->sd_fsname, type,
 968                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
 969                qd->qd_id);
 970
 971         return 0;
 972 }
 973
 974 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 975 {
 976         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 977         struct gfs2_alloc *al = ip->i_alloc;
 978         struct gfs2_quota_data *qd;
 979         s64 value;
 980         unsigned int x;
 981         int error = 0;
 982
 983         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
 984                 return 0;
 985
 986         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 987                 return 0;
 988
 989         for (x = 0; x < al->al_qd_num; x++) {
 990                 qd = al->al_qd[x];
 991
 992                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 993                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
 994                         continue;
 995
 996                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
 997                 spin_lock(&sdp->sd_quota_spin);
 998                 value += qd->qd_change;
 999                 spin_unlock(&sdp->sd_quota_spin);
1000
1001                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1002                         print_message(qd, "exceeded");
1003                         error = -EDQUOT;
1004                         break;
1005                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1006                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1007                            time_after_eq(jiffies, qd->qd_last_warn +
1008                                          gfs2_tune_get(sdp,
1009                                                 gt_quota_warn_period) * HZ)) {
1010                         error = print_message(qd, "warning");
1011                         qd->qd_last_warn = jiffies;
1012                 }
1013         }
1014
1015         return error;
1016 }
1017
1018 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1019                        u32 uid, u32 gid)
1020 {
1021         struct gfs2_alloc *al = ip->i_alloc;
1022         struct gfs2_quota_data *qd;
1023         unsigned int x;
1024
1025         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1026                 return;
1027         if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
1028                 return;
1029
1030         for (x = 0; x < al->al_qd_num; x++) {
1031                 qd = al->al_qd[x];
1032
1033                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1034                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1035                         do_qc(qd, change);
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