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 #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/kthread.h>
  49 #include <linux/freezer.h>
  50 #include <linux/quota.h>
  51 #include <linux/dqblk_xfs.h>
  52
  53 #include "gfs2.h"
  54 #include "incore.h"
  55 #include "bmap.h"
  56 #include "glock.h"
  57 #include "glops.h"
  58 #include "log.h"
  59 #include "meta_io.h"
  60 #include "quota.h"
  61 #include "rgrp.h"
  62 #include "super.h"
  63 #include "trans.h"
  64 #include "inode.h"
  65 #include "util.h"
  66
  67 #define QUOTA_USER 1
  68 #define QUOTA_GROUP 0
  69
  70 struct gfs2_quota_change_host {
  71         u64 qc_change;
  72         u32 qc_flags; /* GFS2_QCF_... */
  73         u32 qc_id;
  74 };
  75
  76 static LIST_HEAD(qd_lru_list);
  77 static atomic_t qd_lru_count = ATOMIC_INIT(0);
  78 static DEFINE_SPINLOCK(qd_lru_lock);
  79
  80 int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
  81 {
  82         struct gfs2_quota_data *qd;
  83         struct gfs2_sbd *sdp;
  84
  85         if (nr == 0)
  86                 goto out;
  87
  88         if (!(gfp_mask & __GFP_FS))
  89                 return -1;
  90
  91         spin_lock(&qd_lru_lock);
  92         while (nr && !list_empty(&qd_lru_list)) {
  93                 qd = list_entry(qd_lru_list.next,
  94                                 struct gfs2_quota_data, qd_reclaim);
  95                 sdp = qd->qd_gl->gl_sbd;
  96
  97                 /* Free from the filesystem-specific list */
  98                 list_del(&qd->qd_list);
  99
 100                 gfs2_assert_warn(sdp, !qd->qd_change);
 101                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 102                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 103
 104                 gfs2_glock_put(qd->qd_gl);
 105                 atomic_dec(&sdp->sd_quota_count);
 106
 107                 /* Delete it from the common reclaim list */
 108                 list_del_init(&qd->qd_reclaim);
 109                 atomic_dec(&qd_lru_count);
 110                 spin_unlock(&qd_lru_lock);
 111                 kmem_cache_free(gfs2_quotad_cachep, qd);
 112                 spin_lock(&qd_lru_lock);
 113                 nr--;
 114         }
 115         spin_unlock(&qd_lru_lock);
 116
 117 out:
 118         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 119 }
 120
 121 static u64 qd2offset(struct gfs2_quota_data *qd)
 122 {
 123         u64 offset;
 124
 125         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
 126         offset *= sizeof(struct gfs2_quota);
 127
 128         return offset;
 129 }
 130
 131 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
 132                     struct gfs2_quota_data **qdp)
 133 {
 134         struct gfs2_quota_data *qd;
 135         int error;
 136
 137         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 138         if (!qd)
 139                 return -ENOMEM;
 140
 141         atomic_set(&qd->qd_count, 1);
 142         qd->qd_id = id;
 143         if (user)
 144                 set_bit(QDF_USER, &qd->qd_flags);
 145         qd->qd_slot = -1;
 146         INIT_LIST_HEAD(&qd->qd_reclaim);
 147
 148         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
 149                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 150         if (error)
 151                 goto fail;
 152
 153         *qdp = qd;
 154
 155         return 0;
 156
 157 fail:
 158         kmem_cache_free(gfs2_quotad_cachep, qd);
 159         return error;
 160 }
 161
 162 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
 163                   struct gfs2_quota_data **qdp)
 164 {
 165         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 166         int error, found;
 167
 168         *qdp = NULL;
 169
 170         for (;;) {
 171                 found = 0;
 172                 spin_lock(&qd_lru_lock);
 173                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 174                         if (qd->qd_id == id &&
 175                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 176                                 if (!atomic_read(&qd->qd_count) &&
 177                                     !list_empty(&qd->qd_reclaim)) {
 178                                         /* Remove it from reclaim list */
 179                                         list_del_init(&qd->qd_reclaim);
 180                                         atomic_dec(&qd_lru_count);
 181                                 }
 182                                 atomic_inc(&qd->qd_count);
 183                                 found = 1;
 184                                 break;
 185                         }
 186                 }
 187
 188                 if (!found)
 189                         qd = NULL;
 190
 191                 if (!qd && new_qd) {
 192                         qd = new_qd;
 193                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 194                         atomic_inc(&sdp->sd_quota_count);
 195                         new_qd = NULL;
 196                 }
 197
 198                 spin_unlock(&qd_lru_lock);
 199
 200                 if (qd) {
 201                         if (new_qd) {
 202                                 gfs2_glock_put(new_qd->qd_gl);
 203                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 204                         }
 205                         *qdp = qd;
 206                         return 0;
 207                 }
 208
 209                 error = qd_alloc(sdp, user, id, &new_qd);
 210                 if (error)
 211                         return error;
 212         }
 213 }
 214
 215 static void qd_hold(struct gfs2_quota_data *qd)
 216 {
 217         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 218         gfs2_assert(sdp, atomic_read(&qd->qd_count));
 219         atomic_inc(&qd->qd_count);
 220 }
 221
 222 static void qd_put(struct gfs2_quota_data *qd)
 223 {
 224         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
 225                 /* Add to the reclaim list */
 226                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 227                 atomic_inc(&qd_lru_count);
 228                 spin_unlock(&qd_lru_lock);
 229         }
 230 }
 231
 232 static int slot_get(struct gfs2_quota_data *qd)
 233 {
 234         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 235         unsigned int c, o = 0, b;
 236         unsigned char byte = 0;
 237
 238         spin_lock(&qd_lru_lock);
 239
 240         if (qd->qd_slot_count++) {
 241                 spin_unlock(&qd_lru_lock);
 242                 return 0;
 243         }
 244
 245         for (c = 0; c < sdp->sd_quota_chunks; c++)
 246                 for (o = 0; o < PAGE_SIZE; o++) {
 247                         byte = sdp->sd_quota_bitmap[c][o];
 248                         if (byte != 0xFF)
 249                                 goto found;
 250                 }
 251
 252         goto fail;
 253
 254 found:
 255         for (b = 0; b < 8; b++)
 256                 if (!(byte & (1 << b)))
 257                         break;
 258         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 259
 260         if (qd->qd_slot >= sdp->sd_quota_slots)
 261                 goto fail;
 262
 263         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 264
 265         spin_unlock(&qd_lru_lock);
 266
 267         return 0;
 268
 269 fail:
 270         qd->qd_slot_count--;
 271         spin_unlock(&qd_lru_lock);
 272         return -ENOSPC;
 273 }
 274
 275 static void slot_hold(struct gfs2_quota_data *qd)
 276 {
 277         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 278
 279         spin_lock(&qd_lru_lock);
 280         gfs2_assert(sdp, qd->qd_slot_count);
 281         qd->qd_slot_count++;
 282         spin_unlock(&qd_lru_lock);
 283 }
 284
 285 static void slot_put(struct gfs2_quota_data *qd)
 286 {
 287         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 288
 289         spin_lock(&qd_lru_lock);
 290         gfs2_assert(sdp, qd->qd_slot_count);
 291         if (!--qd->qd_slot_count) {
 292                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 293                 qd->qd_slot = -1;
 294         }
 295         spin_unlock(&qd_lru_lock);
 296 }
 297
 298 static int bh_get(struct gfs2_quota_data *qd)
 299 {
 300         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 301         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 302         unsigned int block, offset;
 303         struct buffer_head *bh;
 304         int error;
 305         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 306
 307         mutex_lock(&sdp->sd_quota_mutex);
 308
 309         if (qd->qd_bh_count++) {
 310                 mutex_unlock(&sdp->sd_quota_mutex);
 311                 return 0;
 312         }
 313
 314         block = qd->qd_slot / sdp->sd_qc_per_block;
 315         offset = qd->qd_slot % sdp->sd_qc_per_block;
 316
 317         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 318         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 319         if (error)
 320                 goto fail;
 321         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 322         if (error)
 323                 goto fail;
 324         error = -EIO;
 325         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 326                 goto fail_brelse;
 327
 328         qd->qd_bh = bh;
 329         qd->qd_bh_qc = (struct gfs2_quota_change *)
 330                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 331                  offset * sizeof(struct gfs2_quota_change));
 332
 333         mutex_unlock(&sdp->sd_quota_mutex);
 334
 335         return 0;
 336
 337 fail_brelse:
 338         brelse(bh);
 339 fail:
 340         qd->qd_bh_count--;
 341         mutex_unlock(&sdp->sd_quota_mutex);
 342         return error;
 343 }
 344
 345 static void bh_put(struct gfs2_quota_data *qd)
 346 {
 347         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 348
 349         mutex_lock(&sdp->sd_quota_mutex);
 350         gfs2_assert(sdp, qd->qd_bh_count);
 351         if (!--qd->qd_bh_count) {
 352                 brelse(qd->qd_bh);
 353                 qd->qd_bh = NULL;
 354                 qd->qd_bh_qc = NULL;
 355         }
 356         mutex_unlock(&sdp->sd_quota_mutex);
 357 }
 358
 359 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 360 {
 361         struct gfs2_quota_data *qd = NULL;
 362         int error;
 363         int found = 0;
 364
 365         *qdp = NULL;
 366
 367         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 368                 return 0;
 369
 370         spin_lock(&qd_lru_lock);
 371
 372         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 373                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 374                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 375                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 376                         continue;
 377
 378                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 379
 380                 set_bit(QDF_LOCKED, &qd->qd_flags);
 381                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 382                 atomic_inc(&qd->qd_count);
 383                 qd->qd_change_sync = qd->qd_change;
 384                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 385                 qd->qd_slot_count++;
 386                 found = 1;
 387
 388                 break;
 389         }
 390
 391         if (!found)
 392                 qd = NULL;
 393
 394         spin_unlock(&qd_lru_lock);
 395
 396         if (qd) {
 397                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 398                 error = bh_get(qd);
 399                 if (error) {
 400                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 401                         slot_put(qd);
 402                         qd_put(qd);
 403                         return error;
 404                 }
 405         }
 406
 407         *qdp = qd;
 408
 409         return 0;
 410 }
 411
 412 static int qd_trylock(struct gfs2_quota_data *qd)
 413 {
 414         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 415
 416         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 417                 return 0;
 418
 419         spin_lock(&qd_lru_lock);
 420
 421         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 422             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 423                 spin_unlock(&qd_lru_lock);
 424                 return 0;
 425         }
 426
 427         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 428
 429         set_bit(QDF_LOCKED, &qd->qd_flags);
 430         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 431         atomic_inc(&qd->qd_count);
 432         qd->qd_change_sync = qd->qd_change;
 433         gfs2_assert_warn(sdp, qd->qd_slot_count);
 434         qd->qd_slot_count++;
 435
 436         spin_unlock(&qd_lru_lock);
 437
 438         gfs2_assert_warn(sdp, qd->qd_change_sync);
 439         if (bh_get(qd)) {
 440                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 441                 slot_put(qd);
 442                 qd_put(qd);
 443                 return 0;
 444         }
 445
 446         return 1;
 447 }
 448
 449 static void qd_unlock(struct gfs2_quota_data *qd)
 450 {
 451         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 452                          test_bit(QDF_LOCKED, &qd->qd_flags));
 453         clear_bit(QDF_LOCKED, &qd->qd_flags);
 454         bh_put(qd);
 455         slot_put(qd);
 456         qd_put(qd);
 457 }
 458
 459 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
 460                     struct gfs2_quota_data **qdp)
 461 {
 462         int error;
 463
 464         error = qd_get(sdp, user, id, qdp);
 465         if (error)
 466                 return error;
 467
 468         error = slot_get(*qdp);
 469         if (error)
 470                 goto fail;
 471
 472         error = bh_get(*qdp);
 473         if (error)
 474                 goto fail_slot;
 475
 476         return 0;
 477
 478 fail_slot:
 479         slot_put(*qdp);
 480 fail:
 481         qd_put(*qdp);
 482         return error;
 483 }
 484
 485 static void qdsb_put(struct gfs2_quota_data *qd)
 486 {
 487         bh_put(qd);
 488         slot_put(qd);
 489         qd_put(qd);
 490 }
 491
 492 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 493 {
 494         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 495         struct gfs2_alloc *al = ip->i_alloc;
 496         struct gfs2_quota_data **qd = al->al_qd;
 497         int error;
 498
 499         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
 500             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 501                 return -EIO;
 502
 503         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 504                 return 0;
 505
 506         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
 507         if (error)
 508                 goto out;
 509         al->al_qd_num++;
 510         qd++;
 511
 512         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
 513         if (error)
 514                 goto out;
 515         al->al_qd_num++;
 516         qd++;
 517
 518         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 519                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
 520                 if (error)
 521                         goto out;
 522                 al->al_qd_num++;
 523                 qd++;
 524         }
 525
 526         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 527                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
 528                 if (error)
 529                         goto out;
 530                 al->al_qd_num++;
 531                 qd++;
 532         }
 533
 534 out:
 535         if (error)
 536                 gfs2_quota_unhold(ip);
 537         return error;
 538 }
 539
 540 void gfs2_quota_unhold(struct gfs2_inode *ip)
 541 {
 542         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 543         struct gfs2_alloc *al = ip->i_alloc;
 544         unsigned int x;
 545
 546         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 547
 548         for (x = 0; x < al->al_qd_num; x++) {
 549                 qdsb_put(al->al_qd[x]);
 550                 al->al_qd[x] = NULL;
 551         }
 552         al->al_qd_num = 0;
 553 }
 554
 555 static int sort_qd(const void *a, const void *b)
 556 {
 557         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 558         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 559
 560         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 561             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 562                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 563                         return -1;
 564                 else
 565                         return 1;
 566         }
 567         if (qd_a->qd_id < qd_b->qd_id)
 568                 return -1;
 569         if (qd_a->qd_id > qd_b->qd_id)
 570                 return 1;
 571
 572         return 0;
 573 }
 574
 575 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 576 {
 577         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 578         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 579         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 580         s64 x;
 581
 582         mutex_lock(&sdp->sd_quota_mutex);
 583         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 584
 585         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 586                 qc->qc_change = 0;
 587                 qc->qc_flags = 0;
 588                 if (test_bit(QDF_USER, &qd->qd_flags))
 589                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 590                 qc->qc_id = cpu_to_be32(qd->qd_id);
 591         }
 592
 593         x = be64_to_cpu(qc->qc_change) + change;
 594         qc->qc_change = cpu_to_be64(x);
 595
 596         spin_lock(&qd_lru_lock);
 597         qd->qd_change = x;
 598         spin_unlock(&qd_lru_lock);
 599
 600         if (!x) {
 601                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 602                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 603                 qc->qc_flags = 0;
 604                 qc->qc_id = 0;
 605                 slot_put(qd);
 606                 qd_put(qd);
 607         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 608                 qd_hold(qd);
 609                 slot_hold(qd);
 610         }
 611
 612         mutex_unlock(&sdp->sd_quota_mutex);
 613 }
 614
 615 /**
 616  * gfs2_adjust_quota - adjust record of current block usage
 617  * @ip: The quota inode
 618  * @loc: Offset of the entry in the quota file
 619  * @change: The amount of usage change to record
 620  * @qd: The quota data
 621  * @fdq: The updated limits to record
 622  *
 623  * This function was mostly borrowed from gfs2_block_truncate_page which was
 624  * in turn mostly borrowed from ext3
 625  *
 626  * Returns: 0 or -ve on error
 627  */
 628
 629 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 630                              s64 change, struct gfs2_quota_data *qd,
 631                              struct fs_disk_quota *fdq)
 632 {
 633         struct inode *inode = &ip->i_inode;
 634         struct gfs2_sbd *sdp = GFS2_SB(inode);
 635         struct address_space *mapping = inode->i_mapping;
 636         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 637         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 638         unsigned blocksize, iblock, pos;
 639         struct buffer_head *bh, *dibh;
 640         struct page *page;
 641         void *kaddr, *ptr;
 642         struct gfs2_quota q, *qp;
 643         int err, nbytes;
 644         u64 size;
 645
 646         if (gfs2_is_stuffed(ip))
 647                 gfs2_unstuff_dinode(ip, NULL);
 648
 649         memset(&q, 0, sizeof(struct gfs2_quota));
 650         err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q));
 651         if (err < 0)
 652                 return err;
 653
 654         err = -EIO;
 655         qp = &q;
 656         qp->qu_value = be64_to_cpu(qp->qu_value);
 657         qp->qu_value += change;
 658         qp->qu_value = cpu_to_be64(qp->qu_value);
 659         qd->qd_qb.qb_value = qp->qu_value;
 660         if (fdq) {
 661                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 662                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 663                         qd->qd_qb.qb_warn = qp->qu_warn;
 664                 }
 665                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 666                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 667                         qd->qd_qb.qb_limit = qp->qu_limit;
 668                 }
 669                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 670                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 671                         qd->qd_qb.qb_value = qp->qu_value;
 672                 }
 673         }
 674
 675         /* Write the quota into the quota file on disk */
 676         ptr = qp;
 677         nbytes = sizeof(struct gfs2_quota);
 678 get_a_page:
 679         page = grab_cache_page(mapping, index);
 680         if (!page)
 681                 return -ENOMEM;
 682
 683         blocksize = inode->i_sb->s_blocksize;
 684         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 685
 686         if (!page_has_buffers(page))
 687                 create_empty_buffers(page, blocksize, 0);
 688
 689         bh = page_buffers(page);
 690         pos = blocksize;
 691         while (offset >= pos) {
 692                 bh = bh->b_this_page;
 693                 iblock++;
 694                 pos += blocksize;
 695         }
 696
 697         if (!buffer_mapped(bh)) {
 698                 gfs2_block_map(inode, iblock, bh, 1);
 699                 if (!buffer_mapped(bh))
 700                         goto unlock_out;
 701                 /* If it's a newly allocated disk block for quota, zero it */
 702                 if (buffer_new(bh))
 703                         zero_user(page, pos - blocksize, bh->b_size);
 704         }
 705
 706         if (PageUptodate(page))
 707                 set_buffer_uptodate(bh);
 708
 709         if (!buffer_uptodate(bh)) {
 710                 ll_rw_block(READ_META, 1, &bh);
 711                 wait_on_buffer(bh);
 712                 if (!buffer_uptodate(bh))
 713                         goto unlock_out;
 714         }
 715
 716         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 717
 718         kaddr = kmap_atomic(page, KM_USER0);
 719         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 720                 nbytes = PAGE_CACHE_SIZE - offset;
 721         memcpy(kaddr + offset, ptr, nbytes);
 722         flush_dcache_page(page);
 723         kunmap_atomic(kaddr, KM_USER0);
 724         unlock_page(page);
 725         page_cache_release(page);
 726
 727         /* If quota straddles page boundary, we need to update the rest of the
 728          * quota at the beginning of the next page */
 729         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 730                 ptr = ptr + nbytes;
 731                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 732                 offset = 0;
 733                 index++;
 734                 goto get_a_page;
 735         }
 736
 737         /* Update the disk inode timestamp and size (if extended) */
 738         err = gfs2_meta_inode_buffer(ip, &dibh);
 739         if (err)
 740                 goto out;
 741
 742         size = loc + sizeof(struct gfs2_quota);
 743         if (size > inode->i_size)
 744                 i_size_write(inode, size);
 745         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 746         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 747         gfs2_dinode_out(ip, dibh->b_data);
 748         brelse(dibh);
 749         mark_inode_dirty(inode);
 750
 751 out:
 752         return err;
 753 unlock_out:
 754         unlock_page(page);
 755         page_cache_release(page);
 756         return err;
 757 }
 758
 759 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 760 {
 761         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 762         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 763         unsigned int data_blocks, ind_blocks;
 764         struct gfs2_holder *ghs, i_gh;
 765         unsigned int qx, x;
 766         struct gfs2_quota_data *qd;
 767         loff_t offset;
 768         unsigned int nalloc = 0, blocks;
 769         struct gfs2_alloc *al = NULL;
 770         int error;
 771
 772         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 773                               &data_blocks, &ind_blocks);
 774
 775         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 776         if (!ghs)
 777                 return -ENOMEM;
 778
 779         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 780         mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
 781         for (qx = 0; qx < num_qd; qx++) {
 782                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 783                                            GL_NOCACHE, &ghs[qx]);
 784                 if (error)
 785                         goto out;
 786         }
 787
 788         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 789         if (error)
 790                 goto out;
 791
 792         for (x = 0; x < num_qd; x++) {
 793                 offset = qd2offset(qda[x]);
 794                 if (gfs2_write_alloc_required(ip, offset,
 795                                               sizeof(struct gfs2_quota)))
 796                         nalloc++;
 797         }
 798
 799         al = gfs2_alloc_get(ip);
 800         if (!al) {
 801                 error = -ENOMEM;
 802                 goto out_gunlock;
 803         }
 804         /*
 805          * 1 blk for unstuffing inode if stuffed. We add this extra
 806          * block to the reservation unconditionally. If the inode
 807          * doesn't need unstuffing, the block will be released to the
 808          * rgrp since it won't be allocated during the transaction
 809          */
 810         al->al_requested = 1;
 811         /* +3 in the end for unstuffing block, inode size update block
 812          * and another block in case quota straddles page boundary and
 813          * two blocks need to be updated instead of 1 */
 814         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 815
 816         if (nalloc)
 817                 al->al_requested += nalloc * (data_blocks + ind_blocks);
 818         error = gfs2_inplace_reserve(ip);
 819         if (error)
 820                 goto out_alloc;
 821
 822         if (nalloc)
 823                 blocks += gfs2_rg_blocks(al) + nalloc * ind_blocks + RES_STATFS;
 824
 825         error = gfs2_trans_begin(sdp, blocks, 0);
 826         if (error)
 827                 goto out_ipres;
 828
 829         for (x = 0; x < num_qd; x++) {
 830                 qd = qda[x];
 831                 offset = qd2offset(qd);
 832                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 833                 if (error)
 834                         goto out_end_trans;
 835
 836                 do_qc(qd, -qd->qd_change_sync);
 837                 set_bit(QDF_REFRESH, &qd->qd_flags);
 838         }
 839
 840         error = 0;
 841
 842 out_end_trans:
 843         gfs2_trans_end(sdp);
 844 out_ipres:
 845         gfs2_inplace_release(ip);
 846 out_alloc:
 847         gfs2_alloc_put(ip);
 848 out_gunlock:
 849         gfs2_glock_dq_uninit(&i_gh);
 850 out:
 851         while (qx--)
 852                 gfs2_glock_dq_uninit(&ghs[qx]);
 853         mutex_unlock(&ip->i_inode.i_mutex);
 854         kfree(ghs);
 855         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 856         return error;
 857 }
 858
 859 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 860 {
 861         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 862         struct gfs2_quota q;
 863         struct gfs2_quota_lvb *qlvb;
 864         loff_t pos;
 865         int error;
 866
 867         memset(&q, 0, sizeof(struct gfs2_quota));
 868         pos = qd2offset(qd);
 869         error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
 870         if (error < 0)
 871                 return error;
 872
 873         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 874         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 875         qlvb->__pad = 0;
 876         qlvb->qb_limit = q.qu_limit;
 877         qlvb->qb_warn = q.qu_warn;
 878         qlvb->qb_value = q.qu_value;
 879         qd->qd_qb = *qlvb;
 880
 881         return 0;
 882 }
 883
 884 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 885                     struct gfs2_holder *q_gh)
 886 {
 887         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 888         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 889         struct gfs2_holder i_gh;
 890         int error;
 891
 892 restart:
 893         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 894         if (error)
 895                 return error;
 896
 897         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 898
 899         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 900                 gfs2_glock_dq_uninit(q_gh);
 901                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 902                                            GL_NOCACHE, q_gh);
 903                 if (error)
 904                         return error;
 905
 906                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 907                 if (error)
 908                         goto fail;
 909
 910                 error = update_qd(sdp, qd);
 911                 if (error)
 912                         goto fail_gunlock;
 913
 914                 gfs2_glock_dq_uninit(&i_gh);
 915                 gfs2_glock_dq_uninit(q_gh);
 916                 force_refresh = 0;
 917                 goto restart;
 918         }
 919
 920         return 0;
 921
 922 fail_gunlock:
 923         gfs2_glock_dq_uninit(&i_gh);
 924 fail:
 925         gfs2_glock_dq_uninit(q_gh);
 926         return error;
 927 }
 928
 929 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 930 {
 931         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 932         struct gfs2_alloc *al = ip->i_alloc;
 933         struct gfs2_quota_data *qd;
 934         unsigned int x;
 935         int error = 0;
 936
 937         gfs2_quota_hold(ip, uid, gid);
 938
 939         if (capable(CAP_SYS_RESOURCE) ||
 940             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 941                 return 0;
 942
 943         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 944              sort_qd, NULL);
 945
 946         for (x = 0; x < al->al_qd_num; x++) {
 947                 int force = NO_FORCE;
 948                 qd = al->al_qd[x];
 949                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 950                         force = FORCE;
 951                 error = do_glock(qd, force, &al->al_qd_ghs[x]);
 952                 if (error)
 953                         break;
 954         }
 955
 956         if (!error)
 957                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 958         else {
 959                 while (x--)
 960                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 961                 gfs2_quota_unhold(ip);
 962         }
 963
 964         return error;
 965 }
 966
 967 static int need_sync(struct gfs2_quota_data *qd)
 968 {
 969         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 970         struct gfs2_tune *gt = &sdp->sd_tune;
 971         s64 value;
 972         unsigned int num, den;
 973         int do_sync = 1;
 974
 975         if (!qd->qd_qb.qb_limit)
 976                 return 0;
 977
 978         spin_lock(&qd_lru_lock);
 979         value = qd->qd_change;
 980         spin_unlock(&qd_lru_lock);
 981
 982         spin_lock(&gt->gt_spin);
 983         num = gt->gt_quota_scale_num;
 984         den = gt->gt_quota_scale_den;
 985         spin_unlock(&gt->gt_spin);
 986
 987         if (value < 0)
 988                 do_sync = 0;
 989         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 990                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 991                 do_sync = 0;
 992         else {
 993                 value *= gfs2_jindex_size(sdp) * num;
 994                 value = div_s64(value, den);
 995                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 996                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 997                         do_sync = 0;
 998         }
 999
1000         return do_sync;
1001 }
1002
1003 void gfs2_quota_unlock(struct gfs2_inode *ip)
1004 {
1005         struct gfs2_alloc *al = ip->i_alloc;
1006         struct gfs2_quota_data *qda[4];
1007         unsigned int count = 0;
1008         unsigned int x;
1009
1010         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1011                 goto out;
1012
1013         for (x = 0; x < al->al_qd_num; x++) {
1014                 struct gfs2_quota_data *qd;
1015                 int sync;
1016
1017                 qd = al->al_qd[x];
1018                 sync = need_sync(qd);
1019
1020                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1021
1022                 if (sync && qd_trylock(qd))
1023                         qda[count++] = qd;
1024         }
1025
1026         if (count) {
1027                 do_sync(count, qda);
1028                 for (x = 0; x < count; x++)
1029                         qd_unlock(qda[x]);
1030         }
1031
1032 out:
1033         gfs2_quota_unhold(ip);
1034 }
1035
1036 #define MAX_LINE 256
1037
1038 static int print_message(struct gfs2_quota_data *qd, char *type)
1039 {
1040         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1041
1042         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1043                sdp->sd_fsname, type,
1044                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1045                qd->qd_id);
1046
1047         return 0;
1048 }
1049
1050 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1051 {
1052         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1053         struct gfs2_alloc *al = ip->i_alloc;
1054         struct gfs2_quota_data *qd;
1055         s64 value;
1056         unsigned int x;
1057         int error = 0;
1058
1059         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1060                 return 0;
1061
1062         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1063                 return 0;
1064
1065         for (x = 0; x < al->al_qd_num; x++) {
1066                 qd = al->al_qd[x];
1067
1068                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1069                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1070                         continue;
1071
1072                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1073                 spin_lock(&qd_lru_lock);
1074                 value += qd->qd_change;
1075                 spin_unlock(&qd_lru_lock);
1076
1077                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1078                         print_message(qd, "exceeded");
1079                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1080                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1081                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1082
1083                         error = -EDQUOT;
1084                         break;
1085                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1086                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1087                            time_after_eq(jiffies, qd->qd_last_warn +
1088                                          gfs2_tune_get(sdp,
1089                                                 gt_quota_warn_period) * HZ)) {
1090                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1091                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1092                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1093                         error = print_message(qd, "warning");
1094                         qd->qd_last_warn = jiffies;
1095                 }
1096         }
1097
1098         return error;
1099 }
1100
1101 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1102                        u32 uid, u32 gid)
1103 {
1104         struct gfs2_alloc *al = ip->i_alloc;
1105         struct gfs2_quota_data *qd;
1106         unsigned int x;
1107
1108         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1109                 return;
1110         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1111                 return;
1112
1113         for (x = 0; x < al->al_qd_num; x++) {
1114                 qd = al->al_qd[x];
1115
1116                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1117                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1118                         do_qc(qd, change);
1119                 }
1120         }
1121 }
1122
1123 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1124 {
1125         struct gfs2_sbd *sdp = sb->s_fs_info;
1126         struct gfs2_quota_data **qda;
1127         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1128         unsigned int num_qd;
1129         unsigned int x;
1130         int error = 0;
1131
1132         sdp->sd_quota_sync_gen++;
1133
1134         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1135         if (!qda)
1136                 return -ENOMEM;
1137
1138         do {
1139                 num_qd = 0;
1140
1141                 for (;;) {
1142                         error = qd_fish(sdp, qda + num_qd);
1143                         if (error || !qda[num_qd])
1144                                 break;
1145                         if (++num_qd == max_qd)
1146                                 break;
1147                 }
1148
1149                 if (num_qd) {
1150                         if (!error)
1151                                 error = do_sync(num_qd, qda);
1152                         if (!error)
1153                                 for (x = 0; x < num_qd; x++)
1154                                         qda[x]->qd_sync_gen =
1155                                                 sdp->sd_quota_sync_gen;
1156
1157                         for (x = 0; x < num_qd; x++)
1158                                 qd_unlock(qda[x]);
1159                 }
1160         } while (!error && num_qd == max_qd);
1161
1162         kfree(qda);
1163
1164         return error;
1165 }
1166
1167 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1168 {
1169         return gfs2_quota_sync(sb, type, 0);
1170 }
1171
1172 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1173 {
1174         struct gfs2_quota_data *qd;
1175         struct gfs2_holder q_gh;
1176         int error;
1177
1178         error = qd_get(sdp, user, id, &qd);
1179         if (error)
1180                 return error;
1181
1182         error = do_glock(qd, FORCE, &q_gh);
1183         if (!error)
1184                 gfs2_glock_dq_uninit(&q_gh);
1185
1186         qd_put(qd);
1187         return error;
1188 }
1189
1190 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1191 {
1192         const struct gfs2_quota_change *str = buf;
1193
1194         qc->qc_change = be64_to_cpu(str->qc_change);
1195         qc->qc_flags = be32_to_cpu(str->qc_flags);
1196         qc->qc_id = be32_to_cpu(str->qc_id);
1197 }
1198
1199 int gfs2_quota_init(struct gfs2_sbd *sdp)
1200 {
1201         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1202         u64 size = i_size_read(sdp->sd_qc_inode);
1203         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1204         unsigned int x, slot = 0;
1205         unsigned int found = 0;
1206         u64 dblock;
1207         u32 extlen = 0;
1208         int error;
1209
1210         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1211                 return -EIO;
1212
1213         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1214         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1215
1216         error = -ENOMEM;
1217
1218         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1219                                        sizeof(unsigned char *), GFP_NOFS);
1220         if (!sdp->sd_quota_bitmap)
1221                 return error;
1222
1223         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1224                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1225                 if (!sdp->sd_quota_bitmap[x])
1226                         goto fail;
1227         }
1228
1229         for (x = 0; x < blocks; x++) {
1230                 struct buffer_head *bh;
1231                 unsigned int y;
1232
1233                 if (!extlen) {
1234                         int new = 0;
1235                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1236                         if (error)
1237                                 goto fail;
1238                 }
1239                 error = -EIO;
1240                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1241                 if (!bh)
1242                         goto fail;
1243                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1244                         brelse(bh);
1245                         goto fail;
1246                 }
1247
1248                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1249                      y++, slot++) {
1250                         struct gfs2_quota_change_host qc;
1251                         struct gfs2_quota_data *qd;
1252
1253                         gfs2_quota_change_in(&qc, bh->b_data +
1254                                           sizeof(struct gfs2_meta_header) +
1255                                           y * sizeof(struct gfs2_quota_change));
1256                         if (!qc.qc_change)
1257                                 continue;
1258
1259                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1260                                          qc.qc_id, &qd);
1261                         if (error) {
1262                                 brelse(bh);
1263                                 goto fail;
1264                         }
1265
1266                         set_bit(QDF_CHANGE, &qd->qd_flags);
1267                         qd->qd_change = qc.qc_change;
1268                         qd->qd_slot = slot;
1269                         qd->qd_slot_count = 1;
1270
1271                         spin_lock(&qd_lru_lock);
1272                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1273                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1274                         atomic_inc(&sdp->sd_quota_count);
1275                         spin_unlock(&qd_lru_lock);
1276
1277                         found++;
1278                 }
1279
1280                 brelse(bh);
1281                 dblock++;
1282                 extlen--;
1283         }
1284
1285         if (found)
1286                 fs_info(sdp, "found %u quota changes\n", found);
1287
1288         return 0;
1289
1290 fail:
1291         gfs2_quota_cleanup(sdp);
1292         return error;
1293 }
1294
1295 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1296 {
1297         struct list_head *head = &sdp->sd_quota_list;
1298         struct gfs2_quota_data *qd;
1299         unsigned int x;
1300
1301         spin_lock(&qd_lru_lock);
1302         while (!list_empty(head)) {
1303                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1304
1305                 if (atomic_read(&qd->qd_count) > 1 ||
1306                     (atomic_read(&qd->qd_count) &&
1307                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1308                         list_move(&qd->qd_list, head);
1309                         spin_unlock(&qd_lru_lock);
1310                         schedule();
1311                         spin_lock(&qd_lru_lock);
1312                         continue;
1313                 }
1314
1315                 list_del(&qd->qd_list);
1316                 /* Also remove if this qd exists in the reclaim list */
1317                 if (!list_empty(&qd->qd_reclaim)) {
1318                         list_del_init(&qd->qd_reclaim);
1319                         atomic_dec(&qd_lru_count);
1320                 }
1321                 atomic_dec(&sdp->sd_quota_count);
1322                 spin_unlock(&qd_lru_lock);
1323
1324                 if (!atomic_read(&qd->qd_count)) {
1325                         gfs2_assert_warn(sdp, !qd->qd_change);
1326                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1327                 } else
1328                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1329                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1330
1331                 gfs2_glock_put(qd->qd_gl);
1332                 kmem_cache_free(gfs2_quotad_cachep, qd);
1333
1334                 spin_lock(&qd_lru_lock);
1335         }
1336         spin_unlock(&qd_lru_lock);
1337
1338         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1339
1340         if (sdp->sd_quota_bitmap) {
1341                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1342                         kfree(sdp->sd_quota_bitmap[x]);
1343                 kfree(sdp->sd_quota_bitmap);
1344         }
1345 }
1346
1347 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1348 {
1349         if (error == 0 || error == -EROFS)
1350                 return;
1351         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1352                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1353 }
1354
1355 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1356                                int (*fxn)(struct super_block *sb, int type),
1357                                unsigned long t, unsigned long *timeo,
1358                                unsigned int *new_timeo)
1359 {
1360         if (t >= *timeo) {
1361                 int error = fxn(sdp->sd_vfs, 0);
1362                 quotad_error(sdp, msg, error);
1363                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1364         } else {
1365                 *timeo -= t;
1366         }
1367 }
1368
1369 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1370 {
1371         struct gfs2_inode *ip;
1372
1373         while(1) {
1374                 ip = NULL;
1375                 spin_lock(&sdp->sd_trunc_lock);
1376                 if (!list_empty(&sdp->sd_trunc_list)) {
1377                         ip = list_entry(sdp->sd_trunc_list.next,
1378                                         struct gfs2_inode, i_trunc_list);
1379                         list_del_init(&ip->i_trunc_list);
1380                 }
1381                 spin_unlock(&sdp->sd_trunc_lock);
1382                 if (ip == NULL)
1383                         return;
1384                 gfs2_glock_finish_truncate(ip);
1385         }
1386 }
1387
1388 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1389         if (!sdp->sd_statfs_force_sync) {
1390                 sdp->sd_statfs_force_sync = 1;
1391                 wake_up(&sdp->sd_quota_wait);
1392         }
1393 }
1394
1395
1396 /**
1397  * gfs2_quotad - Write cached quota changes into the quota file
1398  * @sdp: Pointer to GFS2 superblock
1399  *
1400  */
1401
1402 int gfs2_quotad(void *data)
1403 {
1404         struct gfs2_sbd *sdp = data;
1405         struct gfs2_tune *tune = &sdp->sd_tune;
1406         unsigned long statfs_timeo = 0;
1407         unsigned long quotad_timeo = 0;
1408         unsigned long t = 0;
1409         DEFINE_WAIT(wait);
1410         int empty;
1411
1412         while (!kthread_should_stop()) {
1413
1414                 /* Update the master statfs file */
1415                 if (sdp->sd_statfs_force_sync) {
1416                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1417                         quotad_error(sdp, "statfs", error);
1418                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1419                 }
1420                 else
1421                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1422                                            &statfs_timeo,
1423                                            &tune->gt_statfs_quantum);
1424
1425                 /* Update quota file */
1426                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1427                                    &quotad_timeo, &tune->gt_quota_quantum);
1428
1429                 /* Check for & recover partially truncated inodes */
1430                 quotad_check_trunc_list(sdp);
1431
1432                 if (freezing(current))
1433                         refrigerator();
1434                 t = min(quotad_timeo, statfs_timeo);
1435
1436                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1437                 spin_lock(&sdp->sd_trunc_lock);
1438                 empty = list_empty(&sdp->sd_trunc_list);
1439                 spin_unlock(&sdp->sd_trunc_lock);
1440                 if (empty && !sdp->sd_statfs_force_sync)
1441                         t -= schedule_timeout(t);
1442                 else
1443                         t = 0;
1444                 finish_wait(&sdp->sd_quota_wait, &wait);
1445         }
1446
1447         return 0;
1448 }
1449
1450 static int gfs2_quota_get_xstate(struct super_block *sb,
1451                                  struct fs_quota_stat *fqs)
1452 {
1453         struct gfs2_sbd *sdp = sb->s_fs_info;
1454
1455         memset(fqs, 0, sizeof(struct fs_quota_stat));
1456         fqs->qs_version = FS_QSTAT_VERSION;
1457
1458         switch (sdp->sd_args.ar_quota) {
1459         case GFS2_QUOTA_ON:
1460                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1461                 /*FALLTHRU*/
1462         case GFS2_QUOTA_ACCOUNT:
1463                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1464                 break;
1465         case GFS2_QUOTA_OFF:
1466                 break;
1467         }
1468
1469         if (sdp->sd_quota_inode) {
1470                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1471                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1472         }
1473         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1474         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1475         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1476         return 0;
1477 }
1478
1479 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1480                           struct fs_disk_quota *fdq)
1481 {
1482         struct gfs2_sbd *sdp = sb->s_fs_info;
1483         struct gfs2_quota_lvb *qlvb;
1484         struct gfs2_quota_data *qd;
1485         struct gfs2_holder q_gh;
1486         int error;
1487
1488         memset(fdq, 0, sizeof(struct fs_disk_quota));
1489
1490         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1491                 return -ESRCH; /* Crazy XFS error code */
1492
1493         if (type == USRQUOTA)
1494                 type = QUOTA_USER;
1495         else if (type == GRPQUOTA)
1496                 type = QUOTA_GROUP;
1497         else
1498                 return -EINVAL;
1499
1500         error = qd_get(sdp, type, id, &qd);
1501         if (error)
1502                 return error;
1503         error = do_glock(qd, FORCE, &q_gh);
1504         if (error)
1505                 goto out;
1506
1507         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1508         fdq->d_version = FS_DQUOT_VERSION;
1509         fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1510         fdq->d_id = id;
1511         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1512         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1513         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1514
1515         gfs2_glock_dq_uninit(&q_gh);
1516 out:
1517         qd_put(qd);
1518         return error;
1519 }
1520
1521 /* GFS2 only supports a subset of the XFS fields */
1522 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1523
1524 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1525                           struct fs_disk_quota *fdq)
1526 {
1527         struct gfs2_sbd *sdp = sb->s_fs_info;
1528         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1529         struct gfs2_quota_data *qd;
1530         struct gfs2_holder q_gh, i_gh;
1531         unsigned int data_blocks, ind_blocks;
1532         unsigned int blocks = 0;
1533         int alloc_required;
1534         struct gfs2_alloc *al;
1535         loff_t offset;
1536         int error;
1537
1538         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1539                 return -ESRCH; /* Crazy XFS error code */
1540
1541         switch(type) {
1542         case USRQUOTA:
1543                 type = QUOTA_USER;
1544                 if (fdq->d_flags != FS_USER_QUOTA)
1545                         return -EINVAL;
1546                 break;
1547         case GRPQUOTA:
1548                 type = QUOTA_GROUP;
1549                 if (fdq->d_flags != FS_GROUP_QUOTA)
1550                         return -EINVAL;
1551                 break;
1552         default:
1553                 return -EINVAL;
1554         }
1555
1556         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1557                 return -EINVAL;
1558         if (fdq->d_id != id)
1559                 return -EINVAL;
1560
1561         error = qd_get(sdp, type, id, &qd);
1562         if (error)
1563                 return error;
1564
1565         mutex_lock(&ip->i_inode.i_mutex);
1566         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1567         if (error)
1568                 goto out_put;
1569         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1570         if (error)
1571                 goto out_q;
1572
1573         /* Check for existing entry, if none then alloc new blocks */
1574         error = update_qd(sdp, qd);
1575         if (error)
1576                 goto out_i;
1577
1578         /* If nothing has changed, this is a no-op */
1579         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1580             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1581                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1582
1583         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1584             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1585                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1586
1587         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1588             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1589                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1590
1591         if (fdq->d_fieldmask == 0)
1592                 goto out_i;
1593
1594         offset = qd2offset(qd);
1595         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1596         if (gfs2_is_stuffed(ip))
1597                 alloc_required = 1;
1598         if (alloc_required) {
1599                 al = gfs2_alloc_get(ip);
1600                 if (al == NULL)
1601                         goto out_i;
1602                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1603                                        &data_blocks, &ind_blocks);
1604                 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1605                 error = gfs2_inplace_reserve(ip);
1606                 if (error)
1607                         goto out_alloc;
1608                 blocks += gfs2_rg_blocks(al);
1609         }
1610
1611         /* Some quotas span block boundaries and can update two blocks,
1612            adding an extra block to the transaction to handle such quotas */
1613         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1614         if (error)
1615                 goto out_release;
1616
1617         /* Apply changes */
1618         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1619
1620         gfs2_trans_end(sdp);
1621 out_release:
1622         if (alloc_required) {
1623                 gfs2_inplace_release(ip);
1624 out_alloc:
1625                 gfs2_alloc_put(ip);
1626         }
1627 out_i:
1628         gfs2_glock_dq_uninit(&i_gh);
1629 out_q:
1630         gfs2_glock_dq_uninit(&q_gh);
1631 out_put:
1632         mutex_unlock(&ip->i_inode.i_mutex);
1633         qd_put(qd);
1634         return error;
1635 }
1636
1637 const struct quotactl_ops gfs2_quotactl_ops = {
1638         .quota_sync     = gfs2_quota_sync,
1639         .get_xstate     = gfs2_quota_get_xstate,
1640         .get_dqblk      = gfs2_get_dqblk,
1641         .set_dqblk      = gfs2_set_dqblk,
1642 };