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(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 address_space *mapping = inode->i_mapping;
 635         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 636         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 637         unsigned blocksize, iblock, pos;
 638         struct buffer_head *bh, *dibh;
 639         struct page *page;
 640         void *kaddr;
 641         struct gfs2_quota *qp;
 642         s64 value;
 643         int err = -EIO;
 644         u64 size;
 645
 646         if (gfs2_is_stuffed(ip))
 647                 gfs2_unstuff_dinode(ip, NULL);
 648
 649         page = grab_cache_page(mapping, index);
 650         if (!page)
 651                 return -ENOMEM;
 652
 653         blocksize = inode->i_sb->s_blocksize;
 654         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 655
 656         if (!page_has_buffers(page))
 657                 create_empty_buffers(page, blocksize, 0);
 658
 659         bh = page_buffers(page);
 660         pos = blocksize;
 661         while (offset >= pos) {
 662                 bh = bh->b_this_page;
 663                 iblock++;
 664                 pos += blocksize;
 665         }
 666
 667         if (!buffer_mapped(bh)) {
 668                 gfs2_block_map(inode, iblock, bh, 1);
 669                 if (!buffer_mapped(bh))
 670                         goto unlock;
 671         }
 672
 673         if (PageUptodate(page))
 674                 set_buffer_uptodate(bh);
 675
 676         if (!buffer_uptodate(bh)) {
 677                 ll_rw_block(READ_META, 1, &bh);
 678                 wait_on_buffer(bh);
 679                 if (!buffer_uptodate(bh))
 680                         goto unlock;
 681         }
 682
 683         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 684
 685         kaddr = kmap_atomic(page, KM_USER0);
 686         qp = kaddr + offset;
 687         value = (s64)be64_to_cpu(qp->qu_value) + change;
 688         qp->qu_value = cpu_to_be64(value);
 689         qd->qd_qb.qb_value = qp->qu_value;
 690         if (fdq) {
 691                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 692                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);
 693                         qd->qd_qb.qb_warn = qp->qu_warn;
 694                 }
 695                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 696                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);
 697                         qd->qd_qb.qb_limit = qp->qu_limit;
 698                 }
 699         }
 700         flush_dcache_page(page);
 701         kunmap_atomic(kaddr, KM_USER0);
 702
 703         err = gfs2_meta_inode_buffer(ip, &dibh);
 704         if (err)
 705                 goto unlock;
 706
 707         size = loc + sizeof(struct gfs2_quota);
 708         if (size > inode->i_size) {
 709                 ip->i_disksize = size;
 710                 i_size_write(inode, size);
 711         }
 712         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 713         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 714         gfs2_dinode_out(ip, dibh->b_data);
 715         brelse(dibh);
 716         mark_inode_dirty(inode);
 717
 718 unlock:
 719         unlock_page(page);
 720         page_cache_release(page);
 721         return err;
 722 }
 723
 724 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 725 {
 726         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 727         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 728         unsigned int data_blocks, ind_blocks;
 729         struct gfs2_holder *ghs, i_gh;
 730         unsigned int qx, x;
 731         struct gfs2_quota_data *qd;
 732         loff_t offset;
 733         unsigned int nalloc = 0, blocks;
 734         struct gfs2_alloc *al = NULL;
 735         int error;
 736
 737         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 738                               &data_blocks, &ind_blocks);
 739
 740         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 741         if (!ghs)
 742                 return -ENOMEM;
 743
 744         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 745         mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
 746         for (qx = 0; qx < num_qd; qx++) {
 747                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 748                                            GL_NOCACHE, &ghs[qx]);
 749                 if (error)
 750                         goto out;
 751         }
 752
 753         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 754         if (error)
 755                 goto out;
 756
 757         for (x = 0; x < num_qd; x++) {
 758                 int alloc_required;
 759
 760                 offset = qd2offset(qda[x]);
 761                 error = gfs2_write_alloc_required(ip, offset,
 762                                                   sizeof(struct gfs2_quota),
 763                                                   &alloc_required);
 764                 if (error)
 765                         goto out_gunlock;
 766                 if (alloc_required)
 767                         nalloc++;
 768         }
 769
 770         al = gfs2_alloc_get(ip);
 771         if (!al) {
 772                 error = -ENOMEM;
 773                 goto out_gunlock;
 774         }
 775         /*
 776          * 1 blk for unstuffing inode if stuffed. We add this extra
 777          * block to the reservation unconditionally. If the inode
 778          * doesn't need unstuffing, the block will be released to the
 779          * rgrp since it won't be allocated during the transaction
 780          */
 781         al->al_requested = 1;
 782         /* +1 in the end for block requested above for unstuffing */
 783         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
 784
 785         if (nalloc)
 786                 al->al_requested += nalloc * (data_blocks + ind_blocks);
 787         error = gfs2_inplace_reserve(ip);
 788         if (error)
 789                 goto out_alloc;
 790
 791         if (nalloc)
 792                 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
 793
 794         error = gfs2_trans_begin(sdp, blocks, 0);
 795         if (error)
 796                 goto out_ipres;
 797
 798         for (x = 0; x < num_qd; x++) {
 799                 qd = qda[x];
 800                 offset = qd2offset(qd);
 801                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 802                 if (error)
 803                         goto out_end_trans;
 804
 805                 do_qc(qd, -qd->qd_change_sync);
 806         }
 807
 808         error = 0;
 809
 810 out_end_trans:
 811         gfs2_trans_end(sdp);
 812 out_ipres:
 813         gfs2_inplace_release(ip);
 814 out_alloc:
 815         gfs2_alloc_put(ip);
 816 out_gunlock:
 817         gfs2_glock_dq_uninit(&i_gh);
 818 out:
 819         while (qx--)
 820                 gfs2_glock_dq_uninit(&ghs[qx]);
 821         mutex_unlock(&ip->i_inode.i_mutex);
 822         kfree(ghs);
 823         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 824         return error;
 825 }
 826
 827 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 828 {
 829         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 830         struct gfs2_quota q;
 831         struct gfs2_quota_lvb *qlvb;
 832         loff_t pos;
 833         int error;
 834
 835         memset(&q, 0, sizeof(struct gfs2_quota));
 836         pos = qd2offset(qd);
 837         error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
 838         if (error < 0)
 839                 return error;
 840
 841         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 842         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 843         qlvb->__pad = 0;
 844         qlvb->qb_limit = q.qu_limit;
 845         qlvb->qb_warn = q.qu_warn;
 846         qlvb->qb_value = q.qu_value;
 847         qd->qd_qb = *qlvb;
 848
 849         return 0;
 850 }
 851
 852 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 853                     struct gfs2_holder *q_gh)
 854 {
 855         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 856         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 857         struct gfs2_holder i_gh;
 858         int error;
 859
 860 restart:
 861         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 862         if (error)
 863                 return error;
 864
 865         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 866
 867         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 868                 gfs2_glock_dq_uninit(q_gh);
 869                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 870                                            GL_NOCACHE, q_gh);
 871                 if (error)
 872                         return error;
 873
 874                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 875                 if (error)
 876                         goto fail;
 877
 878                 error = update_qd(sdp, qd);
 879                 if (error)
 880                         goto fail_gunlock;
 881
 882                 gfs2_glock_dq_uninit(&i_gh);
 883                 gfs2_glock_dq_uninit(q_gh);
 884                 force_refresh = 0;
 885                 goto restart;
 886         }
 887
 888         return 0;
 889
 890 fail_gunlock:
 891         gfs2_glock_dq_uninit(&i_gh);
 892 fail:
 893         gfs2_glock_dq_uninit(q_gh);
 894         return error;
 895 }
 896
 897 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 898 {
 899         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 900         struct gfs2_alloc *al = ip->i_alloc;
 901         unsigned int x;
 902         int error = 0;
 903
 904         gfs2_quota_hold(ip, uid, gid);
 905
 906         if (capable(CAP_SYS_RESOURCE) ||
 907             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 908                 return 0;
 909
 910         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 911              sort_qd, NULL);
 912
 913         for (x = 0; x < al->al_qd_num; x++) {
 914                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 915                 if (error)
 916                         break;
 917         }
 918
 919         if (!error)
 920                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 921         else {
 922                 while (x--)
 923                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 924                 gfs2_quota_unhold(ip);
 925         }
 926
 927         return error;
 928 }
 929
 930 static int need_sync(struct gfs2_quota_data *qd)
 931 {
 932         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 933         struct gfs2_tune *gt = &sdp->sd_tune;
 934         s64 value;
 935         unsigned int num, den;
 936         int do_sync = 1;
 937
 938         if (!qd->qd_qb.qb_limit)
 939                 return 0;
 940
 941         spin_lock(&qd_lru_lock);
 942         value = qd->qd_change;
 943         spin_unlock(&qd_lru_lock);
 944
 945         spin_lock(&gt->gt_spin);
 946         num = gt->gt_quota_scale_num;
 947         den = gt->gt_quota_scale_den;
 948         spin_unlock(&gt->gt_spin);
 949
 950         if (value < 0)
 951                 do_sync = 0;
 952         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 953                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 954                 do_sync = 0;
 955         else {
 956                 value *= gfs2_jindex_size(sdp) * num;
 957                 value = div_s64(value, den);
 958                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 959                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 960                         do_sync = 0;
 961         }
 962
 963         return do_sync;
 964 }
 965
 966 void gfs2_quota_unlock(struct gfs2_inode *ip)
 967 {
 968         struct gfs2_alloc *al = ip->i_alloc;
 969         struct gfs2_quota_data *qda[4];
 970         unsigned int count = 0;
 971         unsigned int x;
 972
 973         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
 974                 goto out;
 975
 976         for (x = 0; x < al->al_qd_num; x++) {
 977                 struct gfs2_quota_data *qd;
 978                 int sync;
 979
 980                 qd = al->al_qd[x];
 981                 sync = need_sync(qd);
 982
 983                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 984
 985                 if (sync && qd_trylock(qd))
 986                         qda[count++] = qd;
 987         }
 988
 989         if (count) {
 990                 do_sync(count, qda);
 991                 for (x = 0; x < count; x++)
 992                         qd_unlock(qda[x]);
 993         }
 994
 995 out:
 996         gfs2_quota_unhold(ip);
 997 }
 998
 999 #define MAX_LINE 256
1000
1001 static int print_message(struct gfs2_quota_data *qd, char *type)
1002 {
1003         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1004
1005         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1006                sdp->sd_fsname, type,
1007                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1008                qd->qd_id);
1009
1010         return 0;
1011 }
1012
1013 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1014 {
1015         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1016         struct gfs2_alloc *al = ip->i_alloc;
1017         struct gfs2_quota_data *qd;
1018         s64 value;
1019         unsigned int x;
1020         int error = 0;
1021
1022         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1023                 return 0;
1024
1025         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1026                 return 0;
1027
1028         for (x = 0; x < al->al_qd_num; x++) {
1029                 qd = al->al_qd[x];
1030
1031                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1032                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1033                         continue;
1034
1035                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1036                 spin_lock(&qd_lru_lock);
1037                 value += qd->qd_change;
1038                 spin_unlock(&qd_lru_lock);
1039
1040                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1041                         print_message(qd, "exceeded");
1042                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1043                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1044                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1045
1046                         error = -EDQUOT;
1047                         break;
1048                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1049                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1050                            time_after_eq(jiffies, qd->qd_last_warn +
1051                                          gfs2_tune_get(sdp,
1052                                                 gt_quota_warn_period) * HZ)) {
1053                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1054                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1055                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1056                         error = print_message(qd, "warning");
1057                         qd->qd_last_warn = jiffies;
1058                 }
1059         }
1060
1061         return error;
1062 }
1063
1064 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1065                        u32 uid, u32 gid)
1066 {
1067         struct gfs2_alloc *al = ip->i_alloc;
1068         struct gfs2_quota_data *qd;
1069         unsigned int x;
1070
1071         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1072                 return;
1073         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1074                 return;
1075
1076         for (x = 0; x < al->al_qd_num; x++) {
1077                 qd = al->al_qd[x];
1078
1079                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1080                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1081                         do_qc(qd, change);
1082                 }
1083         }
1084 }
1085
1086 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1087 {
1088         struct gfs2_sbd *sdp = sb->s_fs_info;
1089         struct gfs2_quota_data **qda;
1090         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1091         unsigned int num_qd;
1092         unsigned int x;
1093         int error = 0;
1094
1095         sdp->sd_quota_sync_gen++;
1096
1097         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1098         if (!qda)
1099                 return -ENOMEM;
1100
1101         do {
1102                 num_qd = 0;
1103
1104                 for (;;) {
1105                         error = qd_fish(sdp, qda + num_qd);
1106                         if (error || !qda[num_qd])
1107                                 break;
1108                         if (++num_qd == max_qd)
1109                                 break;
1110                 }
1111
1112                 if (num_qd) {
1113                         if (!error)
1114                                 error = do_sync(num_qd, qda);
1115                         if (!error)
1116                                 for (x = 0; x < num_qd; x++)
1117                                         qda[x]->qd_sync_gen =
1118                                                 sdp->sd_quota_sync_gen;
1119
1120                         for (x = 0; x < num_qd; x++)
1121                                 qd_unlock(qda[x]);
1122                 }
1123         } while (!error && num_qd == max_qd);
1124
1125         kfree(qda);
1126
1127         return error;
1128 }
1129
1130 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1131 {
1132         return gfs2_quota_sync(sb, type, 0);
1133 }
1134
1135 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1136 {
1137         struct gfs2_quota_data *qd;
1138         struct gfs2_holder q_gh;
1139         int error;
1140
1141         error = qd_get(sdp, user, id, &qd);
1142         if (error)
1143                 return error;
1144
1145         error = do_glock(qd, FORCE, &q_gh);
1146         if (!error)
1147                 gfs2_glock_dq_uninit(&q_gh);
1148
1149         qd_put(qd);
1150         return error;
1151 }
1152
1153 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1154 {
1155         const struct gfs2_quota_change *str = buf;
1156
1157         qc->qc_change = be64_to_cpu(str->qc_change);
1158         qc->qc_flags = be32_to_cpu(str->qc_flags);
1159         qc->qc_id = be32_to_cpu(str->qc_id);
1160 }
1161
1162 int gfs2_quota_init(struct gfs2_sbd *sdp)
1163 {
1164         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1165         unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1166         unsigned int x, slot = 0;
1167         unsigned int found = 0;
1168         u64 dblock;
1169         u32 extlen = 0;
1170         int error;
1171
1172         if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1173             ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1174                 gfs2_consist_inode(ip);
1175                 return -EIO;
1176         }
1177         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1178         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1179
1180         error = -ENOMEM;
1181
1182         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1183                                        sizeof(unsigned char *), GFP_NOFS);
1184         if (!sdp->sd_quota_bitmap)
1185                 return error;
1186
1187         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1188                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1189                 if (!sdp->sd_quota_bitmap[x])
1190                         goto fail;
1191         }
1192
1193         for (x = 0; x < blocks; x++) {
1194                 struct buffer_head *bh;
1195                 unsigned int y;
1196
1197                 if (!extlen) {
1198                         int new = 0;
1199                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1200                         if (error)
1201                                 goto fail;
1202                 }
1203                 error = -EIO;
1204                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1205                 if (!bh)
1206                         goto fail;
1207                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1208                         brelse(bh);
1209                         goto fail;
1210                 }
1211
1212                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1213                      y++, slot++) {
1214                         struct gfs2_quota_change_host qc;
1215                         struct gfs2_quota_data *qd;
1216
1217                         gfs2_quota_change_in(&qc, bh->b_data +
1218                                           sizeof(struct gfs2_meta_header) +
1219                                           y * sizeof(struct gfs2_quota_change));
1220                         if (!qc.qc_change)
1221                                 continue;
1222
1223                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1224                                          qc.qc_id, &qd);
1225                         if (error) {
1226                                 brelse(bh);
1227                                 goto fail;
1228                         }
1229
1230                         set_bit(QDF_CHANGE, &qd->qd_flags);
1231                         qd->qd_change = qc.qc_change;
1232                         qd->qd_slot = slot;
1233                         qd->qd_slot_count = 1;
1234
1235                         spin_lock(&qd_lru_lock);
1236                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1237                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1238                         atomic_inc(&sdp->sd_quota_count);
1239                         spin_unlock(&qd_lru_lock);
1240
1241                         found++;
1242                 }
1243
1244                 brelse(bh);
1245                 dblock++;
1246                 extlen--;
1247         }
1248
1249         if (found)
1250                 fs_info(sdp, "found %u quota changes\n", found);
1251
1252         return 0;
1253
1254 fail:
1255         gfs2_quota_cleanup(sdp);
1256         return error;
1257 }
1258
1259 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1260 {
1261         struct list_head *head = &sdp->sd_quota_list;
1262         struct gfs2_quota_data *qd;
1263         unsigned int x;
1264
1265         spin_lock(&qd_lru_lock);
1266         while (!list_empty(head)) {
1267                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1268
1269                 if (atomic_read(&qd->qd_count) > 1 ||
1270                     (atomic_read(&qd->qd_count) &&
1271                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1272                         list_move(&qd->qd_list, head);
1273                         spin_unlock(&qd_lru_lock);
1274                         schedule();
1275                         spin_lock(&qd_lru_lock);
1276                         continue;
1277                 }
1278
1279                 list_del(&qd->qd_list);
1280                 /* Also remove if this qd exists in the reclaim list */
1281                 if (!list_empty(&qd->qd_reclaim)) {
1282                         list_del_init(&qd->qd_reclaim);
1283                         atomic_dec(&qd_lru_count);
1284                 }
1285                 atomic_dec(&sdp->sd_quota_count);
1286                 spin_unlock(&qd_lru_lock);
1287
1288                 if (!atomic_read(&qd->qd_count)) {
1289                         gfs2_assert_warn(sdp, !qd->qd_change);
1290                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1291                 } else
1292                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1293                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1294
1295                 gfs2_glock_put(qd->qd_gl);
1296                 kmem_cache_free(gfs2_quotad_cachep, qd);
1297
1298                 spin_lock(&qd_lru_lock);
1299         }
1300         spin_unlock(&qd_lru_lock);
1301
1302         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1303
1304         if (sdp->sd_quota_bitmap) {
1305                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1306                         kfree(sdp->sd_quota_bitmap[x]);
1307                 kfree(sdp->sd_quota_bitmap);
1308         }
1309 }
1310
1311 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1312 {
1313         if (error == 0 || error == -EROFS)
1314                 return;
1315         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1316                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1317 }
1318
1319 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1320                                int (*fxn)(struct super_block *sb, int type),
1321                                unsigned long t, unsigned long *timeo,
1322                                unsigned int *new_timeo)
1323 {
1324         if (t >= *timeo) {
1325                 int error = fxn(sdp->sd_vfs, 0);
1326                 quotad_error(sdp, msg, error);
1327                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1328         } else {
1329                 *timeo -= t;
1330         }
1331 }
1332
1333 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1334 {
1335         struct gfs2_inode *ip;
1336
1337         while(1) {
1338                 ip = NULL;
1339                 spin_lock(&sdp->sd_trunc_lock);
1340                 if (!list_empty(&sdp->sd_trunc_list)) {
1341                         ip = list_entry(sdp->sd_trunc_list.next,
1342                                         struct gfs2_inode, i_trunc_list);
1343                         list_del_init(&ip->i_trunc_list);
1344                 }
1345                 spin_unlock(&sdp->sd_trunc_lock);
1346                 if (ip == NULL)
1347                         return;
1348                 gfs2_glock_finish_truncate(ip);
1349         }
1350 }
1351
1352 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1353         if (!sdp->sd_statfs_force_sync) {
1354                 sdp->sd_statfs_force_sync = 1;
1355                 wake_up(&sdp->sd_quota_wait);
1356         }
1357 }
1358
1359
1360 /**
1361  * gfs2_quotad - Write cached quota changes into the quota file
1362  * @sdp: Pointer to GFS2 superblock
1363  *
1364  */
1365
1366 int gfs2_quotad(void *data)
1367 {
1368         struct gfs2_sbd *sdp = data;
1369         struct gfs2_tune *tune = &sdp->sd_tune;
1370         unsigned long statfs_timeo = 0;
1371         unsigned long quotad_timeo = 0;
1372         unsigned long t = 0;
1373         DEFINE_WAIT(wait);
1374         int empty;
1375
1376         while (!kthread_should_stop()) {
1377
1378                 /* Update the master statfs file */
1379                 if (sdp->sd_statfs_force_sync) {
1380                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1381                         quotad_error(sdp, "statfs", error);
1382                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1383                 }
1384                 else
1385                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1386                                            &statfs_timeo,
1387                                            &tune->gt_statfs_quantum);
1388
1389                 /* Update quota file */
1390                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1391                                    &quotad_timeo, &tune->gt_quota_quantum);
1392
1393                 /* Check for & recover partially truncated inodes */
1394                 quotad_check_trunc_list(sdp);
1395
1396                 if (freezing(current))
1397                         refrigerator();
1398                 t = min(quotad_timeo, statfs_timeo);
1399
1400                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1401                 spin_lock(&sdp->sd_trunc_lock);
1402                 empty = list_empty(&sdp->sd_trunc_list);
1403                 spin_unlock(&sdp->sd_trunc_lock);
1404                 if (empty && !sdp->sd_statfs_force_sync)
1405                         t -= schedule_timeout(t);
1406                 else
1407                         t = 0;
1408                 finish_wait(&sdp->sd_quota_wait, &wait);
1409         }
1410
1411         return 0;
1412 }
1413
1414 static int gfs2_quota_get_xstate(struct super_block *sb,
1415                                  struct fs_quota_stat *fqs)
1416 {
1417         struct gfs2_sbd *sdp = sb->s_fs_info;
1418
1419         memset(fqs, 0, sizeof(struct fs_quota_stat));
1420         fqs->qs_version = FS_QSTAT_VERSION;
1421         if (sdp->sd_args.ar_quota == GFS2_QUOTA_ON)
1422                 fqs->qs_flags = (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1423         else if (sdp->sd_args.ar_quota == GFS2_QUOTA_ACCOUNT)
1424                 fqs->qs_flags = (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1425         if (sdp->sd_quota_inode) {
1426                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1427                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1428         }
1429         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1430         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1431         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1432         return 0;
1433 }
1434
1435 static int gfs2_xquota_get(struct super_block *sb, int type, qid_t id,
1436                            struct fs_disk_quota *fdq)
1437 {
1438         struct gfs2_sbd *sdp = sb->s_fs_info;
1439         struct gfs2_quota_lvb *qlvb;
1440         struct gfs2_quota_data *qd;
1441         struct gfs2_holder q_gh;
1442         int error;
1443
1444         memset(fdq, 0, sizeof(struct fs_disk_quota));
1445
1446         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1447                 return -ESRCH; /* Crazy XFS error code */
1448
1449         if (type == USRQUOTA)
1450                 type = QUOTA_USER;
1451         else if (type == GRPQUOTA)
1452                 type = QUOTA_GROUP;
1453         else
1454                 return -EINVAL;
1455
1456         error = qd_get(sdp, type, id, &qd);
1457         if (error)
1458                 return error;
1459         error = do_glock(qd, FORCE, &q_gh);
1460         if (error)
1461                 goto out;
1462
1463         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1464         fdq->d_version = FS_DQUOT_VERSION;
1465         fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1466         fdq->d_id = id;
1467         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1468         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1469         fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1470
1471         gfs2_glock_dq_uninit(&q_gh);
1472 out:
1473         qd_put(qd);
1474         return error;
1475 }
1476
1477 /* GFS2 only supports a subset of the XFS fields */
1478 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1479
1480 static int gfs2_xquota_set(struct super_block *sb, int type, qid_t id,
1481                            struct fs_disk_quota *fdq)
1482 {
1483         struct gfs2_sbd *sdp = sb->s_fs_info;
1484         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1485         struct gfs2_quota_data *qd;
1486         struct gfs2_holder q_gh, i_gh;
1487         unsigned int data_blocks, ind_blocks;
1488         unsigned int blocks = 0;
1489         int alloc_required;
1490         struct gfs2_alloc *al;
1491         loff_t offset;
1492         int error;
1493
1494         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1495                 return -ESRCH; /* Crazy XFS error code */
1496
1497         switch(type) {
1498         case USRQUOTA:
1499                 type = QUOTA_USER;
1500                 if (fdq->d_flags != XFS_USER_QUOTA)
1501                         return -EINVAL;
1502                 break;
1503         case GRPQUOTA:
1504                 type = QUOTA_GROUP;
1505                 if (fdq->d_flags != XFS_GROUP_QUOTA)
1506                         return -EINVAL;
1507                 break;
1508         default:
1509                 return -EINVAL;
1510         }
1511
1512         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1513                 return -EINVAL;
1514         if (fdq->d_id != id)
1515                 return -EINVAL;
1516
1517         error = qd_get(sdp, type, id, &qd);
1518         if (error)
1519                 return error;
1520
1521         mutex_lock(&ip->i_inode.i_mutex);
1522         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1523         if (error)
1524                 goto out_put;
1525         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1526         if (error)
1527                 goto out_q;
1528
1529         /* Check for existing entry, if none then alloc new blocks */
1530         error = update_qd(sdp, qd);
1531         if (error)
1532                 goto out_i;
1533
1534         /* If nothing has changed, this is a no-op */
1535         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1536             (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1537                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1538         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1539             (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1540                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1541         if (fdq->d_fieldmask == 0)
1542                 goto out_i;
1543
1544         offset = qd2offset(qd);
1545         error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1546                                           &alloc_required);
1547         if (error)
1548                 goto out_i;
1549         if (alloc_required) {
1550                 al = gfs2_alloc_get(ip);
1551                 if (al == NULL)
1552                         goto out_i;
1553                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1554                                        &data_blocks, &ind_blocks);
1555                 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1556                 error = gfs2_inplace_reserve(ip);
1557                 if (error)
1558                         goto out_alloc;
1559         }
1560
1561         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1562         if (error)
1563                 goto out_release;
1564
1565         /* Apply changes */
1566         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1567
1568         gfs2_trans_end(sdp);
1569 out_release:
1570         if (alloc_required) {
1571                 gfs2_inplace_release(ip);
1572 out_alloc:
1573                 gfs2_alloc_put(ip);
1574         }
1575 out_i:
1576         gfs2_glock_dq_uninit(&i_gh);
1577 out_q:
1578         gfs2_glock_dq_uninit(&q_gh);
1579 out_put:
1580         mutex_unlock(&ip->i_inode.i_mutex);
1581         qd_put(qd);
1582         return error;
1583 }
1584
1585 const struct quotactl_ops gfs2_quotactl_ops = {
1586         .quota_sync     = gfs2_quota_sync,
1587         .get_xstate     = gfs2_quota_get_xstate,
1588         .get_xquota     = gfs2_xquota_get,
1589         .set_xquota     = gfs2_xquota_set,
1590 };
1591