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 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, *ptr;
 641         struct gfs2_quota q, *qp;
 642         int err, nbytes;
 643         u64 size;
 644
 645         if (gfs2_is_stuffed(ip))
 646                 gfs2_unstuff_dinode(ip, NULL);
 647
 648         memset(&q, 0, sizeof(struct gfs2_quota));
 649         err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q));
 650         if (err < 0)
 651                 return err;
 652
 653         err = -EIO;
 654         qp = &q;
 655         qp->qu_value = be64_to_cpu(qp->qu_value);
 656         qp->qu_value += change;
 657         qp->qu_value = cpu_to_be64(qp->qu_value);
 658         qd->qd_qb.qb_value = qp->qu_value;
 659         if (fdq) {
 660                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 661                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);
 662                         qd->qd_qb.qb_warn = qp->qu_warn;
 663                 }
 664                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 665                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);
 666                         qd->qd_qb.qb_limit = qp->qu_limit;
 667                 }
 668         }
 669
 670         /* Write the quota into the quota file on disk */
 671         ptr = qp;
 672         nbytes = sizeof(struct gfs2_quota);
 673 get_a_page:
 674         page = grab_cache_page(mapping, index);
 675         if (!page)
 676                 return -ENOMEM;
 677
 678         blocksize = inode->i_sb->s_blocksize;
 679         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 680
 681         if (!page_has_buffers(page))
 682                 create_empty_buffers(page, blocksize, 0);
 683
 684         bh = page_buffers(page);
 685         pos = blocksize;
 686         while (offset >= pos) {
 687                 bh = bh->b_this_page;
 688                 iblock++;
 689                 pos += blocksize;
 690         }
 691
 692         if (!buffer_mapped(bh)) {
 693                 gfs2_block_map(inode, iblock, bh, 1);
 694                 if (!buffer_mapped(bh))
 695                         goto unlock_out;
 696                 /* If it's a newly allocated disk block for quota, zero it */
 697                 if (buffer_new(bh))
 698                         zero_user(page, pos - blocksize, bh->b_size);
 699         }
 700
 701         if (PageUptodate(page))
 702                 set_buffer_uptodate(bh);
 703
 704         if (!buffer_uptodate(bh)) {
 705                 ll_rw_block(READ_META, 1, &bh);
 706                 wait_on_buffer(bh);
 707                 if (!buffer_uptodate(bh))
 708                         goto unlock_out;
 709         }
 710
 711         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 712
 713         kaddr = kmap_atomic(page, KM_USER0);
 714         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 715                 nbytes = PAGE_CACHE_SIZE - offset;
 716         memcpy(kaddr + offset, ptr, nbytes);
 717         flush_dcache_page(page);
 718         kunmap_atomic(kaddr, KM_USER0);
 719         unlock_page(page);
 720         page_cache_release(page);
 721
 722         /* If quota straddles page boundary, we need to update the rest of the
 723          * quota at the beginning of the next page */
 724         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 725                 ptr = ptr + nbytes;
 726                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 727                 offset = 0;
 728                 index++;
 729                 goto get_a_page;
 730         }
 731
 732         /* Update the disk inode timestamp and size (if extended) */
 733         err = gfs2_meta_inode_buffer(ip, &dibh);
 734         if (err)
 735                 goto out;
 736
 737         size = loc + sizeof(struct gfs2_quota);
 738         if (size > inode->i_size) {
 739                 ip->i_disksize = size;
 740                 i_size_write(inode, size);
 741         }
 742         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 743         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 744         gfs2_dinode_out(ip, dibh->b_data);
 745         brelse(dibh);
 746         mark_inode_dirty(inode);
 747
 748 out:
 749         return err;
 750 unlock_out:
 751         unlock_page(page);
 752         page_cache_release(page);
 753         return err;
 754 }
 755
 756 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 757 {
 758         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 759         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 760         unsigned int data_blocks, ind_blocks;
 761         struct gfs2_holder *ghs, i_gh;
 762         unsigned int qx, x;
 763         struct gfs2_quota_data *qd;
 764         loff_t offset;
 765         unsigned int nalloc = 0, blocks;
 766         struct gfs2_alloc *al = NULL;
 767         int error;
 768
 769         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 770                               &data_blocks, &ind_blocks);
 771
 772         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 773         if (!ghs)
 774                 return -ENOMEM;
 775
 776         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 777         mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
 778         for (qx = 0; qx < num_qd; qx++) {
 779                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 780                                            GL_NOCACHE, &ghs[qx]);
 781                 if (error)
 782                         goto out;
 783         }
 784
 785         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 786         if (error)
 787                 goto out;
 788
 789         for (x = 0; x < num_qd; x++) {
 790                 int alloc_required;
 791
 792                 offset = qd2offset(qda[x]);
 793                 error = gfs2_write_alloc_required(ip, offset,
 794                                                   sizeof(struct gfs2_quota),
 795                                                   &alloc_required);
 796                 if (error)
 797                         goto out_gunlock;
 798                 if (alloc_required)
 799                         nalloc++;
 800         }
 801
 802         al = gfs2_alloc_get(ip);
 803         if (!al) {
 804                 error = -ENOMEM;
 805                 goto out_gunlock;
 806         }
 807         /*
 808          * 1 blk for unstuffing inode if stuffed. We add this extra
 809          * block to the reservation unconditionally. If the inode
 810          * doesn't need unstuffing, the block will be released to the
 811          * rgrp since it won't be allocated during the transaction
 812          */
 813         al->al_requested = 1;
 814         /* +3 in the end for unstuffing block, inode size update block
 815          * and another block in case quota straddles page boundary and
 816          * two blocks need to be updated instead of 1 */
 817         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 818
 819         if (nalloc)
 820                 al->al_requested += nalloc * (data_blocks + ind_blocks);
 821         error = gfs2_inplace_reserve(ip);
 822         if (error)
 823                 goto out_alloc;
 824
 825         if (nalloc)
 826                 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
 827
 828         error = gfs2_trans_begin(sdp, blocks, 0);
 829         if (error)
 830                 goto out_ipres;
 831
 832         for (x = 0; x < num_qd; x++) {
 833                 qd = qda[x];
 834                 offset = qd2offset(qd);
 835                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 836                 if (error)
 837                         goto out_end_trans;
 838
 839                 do_qc(qd, -qd->qd_change_sync);
 840         }
 841
 842         error = 0;
 843
 844 out_end_trans:
 845         gfs2_trans_end(sdp);
 846 out_ipres:
 847         gfs2_inplace_release(ip);
 848 out_alloc:
 849         gfs2_alloc_put(ip);
 850 out_gunlock:
 851         gfs2_glock_dq_uninit(&i_gh);
 852 out:
 853         while (qx--)
 854                 gfs2_glock_dq_uninit(&ghs[qx]);
 855         mutex_unlock(&ip->i_inode.i_mutex);
 856         kfree(ghs);
 857         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 858         return error;
 859 }
 860
 861 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 862 {
 863         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 864         struct gfs2_quota q;
 865         struct gfs2_quota_lvb *qlvb;
 866         loff_t pos;
 867         int error;
 868
 869         memset(&q, 0, sizeof(struct gfs2_quota));
 870         pos = qd2offset(qd);
 871         error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
 872         if (error < 0)
 873                 return error;
 874
 875         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 876         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 877         qlvb->__pad = 0;
 878         qlvb->qb_limit = q.qu_limit;
 879         qlvb->qb_warn = q.qu_warn;
 880         qlvb->qb_value = q.qu_value;
 881         qd->qd_qb = *qlvb;
 882
 883         return 0;
 884 }
 885
 886 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 887                     struct gfs2_holder *q_gh)
 888 {
 889         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 890         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 891         struct gfs2_holder i_gh;
 892         int error;
 893
 894 restart:
 895         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 896         if (error)
 897                 return error;
 898
 899         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 900
 901         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 902                 gfs2_glock_dq_uninit(q_gh);
 903                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 904                                            GL_NOCACHE, q_gh);
 905                 if (error)
 906                         return error;
 907
 908                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 909                 if (error)
 910                         goto fail;
 911
 912                 error = update_qd(sdp, qd);
 913                 if (error)
 914                         goto fail_gunlock;
 915
 916                 gfs2_glock_dq_uninit(&i_gh);
 917                 gfs2_glock_dq_uninit(q_gh);
 918                 force_refresh = 0;
 919                 goto restart;
 920         }
 921
 922         return 0;
 923
 924 fail_gunlock:
 925         gfs2_glock_dq_uninit(&i_gh);
 926 fail:
 927         gfs2_glock_dq_uninit(q_gh);
 928         return error;
 929 }
 930
 931 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 932 {
 933         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 934         struct gfs2_alloc *al = ip->i_alloc;
 935         unsigned int x;
 936         int error = 0;
 937
 938         gfs2_quota_hold(ip, uid, gid);
 939
 940         if (capable(CAP_SYS_RESOURCE) ||
 941             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 942                 return 0;
 943
 944         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 945              sort_qd, NULL);
 946
 947         for (x = 0; x < al->al_qd_num; x++) {
 948                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 949                 if (error)
 950                         break;
 951         }
 952
 953         if (!error)
 954                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 955         else {
 956                 while (x--)
 957                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 958                 gfs2_quota_unhold(ip);
 959         }
 960
 961         return error;
 962 }
 963
 964 static int need_sync(struct gfs2_quota_data *qd)
 965 {
 966         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 967         struct gfs2_tune *gt = &sdp->sd_tune;
 968         s64 value;
 969         unsigned int num, den;
 970         int do_sync = 1;
 971
 972         if (!qd->qd_qb.qb_limit)
 973                 return 0;
 974
 975         spin_lock(&qd_lru_lock);
 976         value = qd->qd_change;
 977         spin_unlock(&qd_lru_lock);
 978
 979         spin_lock(&gt->gt_spin);
 980         num = gt->gt_quota_scale_num;
 981         den = gt->gt_quota_scale_den;
 982         spin_unlock(&gt->gt_spin);
 983
 984         if (value < 0)
 985                 do_sync = 0;
 986         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 987                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 988                 do_sync = 0;
 989         else {
 990                 value *= gfs2_jindex_size(sdp) * num;
 991                 value = div_s64(value, den);
 992                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 993                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 994                         do_sync = 0;
 995         }
 996
 997         return do_sync;
 998 }
 999
1000 void gfs2_quota_unlock(struct gfs2_inode *ip)
1001 {
1002         struct gfs2_alloc *al = ip->i_alloc;
1003         struct gfs2_quota_data *qda[4];
1004         unsigned int count = 0;
1005         unsigned int x;
1006
1007         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1008                 goto out;
1009
1010         for (x = 0; x < al->al_qd_num; x++) {
1011                 struct gfs2_quota_data *qd;
1012                 int sync;
1013
1014                 qd = al->al_qd[x];
1015                 sync = need_sync(qd);
1016
1017                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1018
1019                 if (sync && qd_trylock(qd))
1020                         qda[count++] = qd;
1021         }
1022
1023         if (count) {
1024                 do_sync(count, qda);
1025                 for (x = 0; x < count; x++)
1026                         qd_unlock(qda[x]);
1027         }
1028
1029 out:
1030         gfs2_quota_unhold(ip);
1031 }
1032
1033 #define MAX_LINE 256
1034
1035 static int print_message(struct gfs2_quota_data *qd, char *type)
1036 {
1037         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1038
1039         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1040                sdp->sd_fsname, type,
1041                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1042                qd->qd_id);
1043
1044         return 0;
1045 }
1046
1047 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1048 {
1049         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1050         struct gfs2_alloc *al = ip->i_alloc;
1051         struct gfs2_quota_data *qd;
1052         s64 value;
1053         unsigned int x;
1054         int error = 0;
1055
1056         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1057                 return 0;
1058
1059         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1060                 return 0;
1061
1062         for (x = 0; x < al->al_qd_num; x++) {
1063                 qd = al->al_qd[x];
1064
1065                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1066                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1067                         continue;
1068
1069                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1070                 spin_lock(&qd_lru_lock);
1071                 value += qd->qd_change;
1072                 spin_unlock(&qd_lru_lock);
1073
1074                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1075                         print_message(qd, "exceeded");
1076                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1077                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1078                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1079
1080                         error = -EDQUOT;
1081                         break;
1082                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1083                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1084                            time_after_eq(jiffies, qd->qd_last_warn +
1085                                          gfs2_tune_get(sdp,
1086                                                 gt_quota_warn_period) * HZ)) {
1087                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1088                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1089                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1090                         error = print_message(qd, "warning");
1091                         qd->qd_last_warn = jiffies;
1092                 }
1093         }
1094
1095         return error;
1096 }
1097
1098 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1099                        u32 uid, u32 gid)
1100 {
1101         struct gfs2_alloc *al = ip->i_alloc;
1102         struct gfs2_quota_data *qd;
1103         unsigned int x;
1104
1105         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1106                 return;
1107         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1108                 return;
1109
1110         for (x = 0; x < al->al_qd_num; x++) {
1111                 qd = al->al_qd[x];
1112
1113                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1114                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1115                         do_qc(qd, change);
1116                 }
1117         }
1118 }
1119
1120 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1121 {
1122         struct gfs2_sbd *sdp = sb->s_fs_info;
1123         struct gfs2_quota_data **qda;
1124         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1125         unsigned int num_qd;
1126         unsigned int x;
1127         int error = 0;
1128
1129         sdp->sd_quota_sync_gen++;
1130
1131         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1132         if (!qda)
1133                 return -ENOMEM;
1134
1135         do {
1136                 num_qd = 0;
1137
1138                 for (;;) {
1139                         error = qd_fish(sdp, qda + num_qd);
1140                         if (error || !qda[num_qd])
1141                                 break;
1142                         if (++num_qd == max_qd)
1143                                 break;
1144                 }
1145
1146                 if (num_qd) {
1147                         if (!error)
1148                                 error = do_sync(num_qd, qda);
1149                         if (!error)
1150                                 for (x = 0; x < num_qd; x++)
1151                                         qda[x]->qd_sync_gen =
1152                                                 sdp->sd_quota_sync_gen;
1153
1154                         for (x = 0; x < num_qd; x++)
1155                                 qd_unlock(qda[x]);
1156                 }
1157         } while (!error && num_qd == max_qd);
1158
1159         kfree(qda);
1160
1161         return error;
1162 }
1163
1164 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1165 {
1166         return gfs2_quota_sync(sb, type, 0);
1167 }
1168
1169 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1170 {
1171         struct gfs2_quota_data *qd;
1172         struct gfs2_holder q_gh;
1173         int error;
1174
1175         error = qd_get(sdp, user, id, &qd);
1176         if (error)
1177                 return error;
1178
1179         error = do_glock(qd, FORCE, &q_gh);
1180         if (!error)
1181                 gfs2_glock_dq_uninit(&q_gh);
1182
1183         qd_put(qd);
1184         return error;
1185 }
1186
1187 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1188 {
1189         const struct gfs2_quota_change *str = buf;
1190
1191         qc->qc_change = be64_to_cpu(str->qc_change);
1192         qc->qc_flags = be32_to_cpu(str->qc_flags);
1193         qc->qc_id = be32_to_cpu(str->qc_id);
1194 }
1195
1196 int gfs2_quota_init(struct gfs2_sbd *sdp)
1197 {
1198         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1199         unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1200         unsigned int x, slot = 0;
1201         unsigned int found = 0;
1202         u64 dblock;
1203         u32 extlen = 0;
1204         int error;
1205
1206         if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1207             ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1208                 gfs2_consist_inode(ip);
1209                 return -EIO;
1210         }
1211         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1212         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1213
1214         error = -ENOMEM;
1215
1216         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1217                                        sizeof(unsigned char *), GFP_NOFS);
1218         if (!sdp->sd_quota_bitmap)
1219                 return error;
1220
1221         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1222                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1223                 if (!sdp->sd_quota_bitmap[x])
1224                         goto fail;
1225         }
1226
1227         for (x = 0; x < blocks; x++) {
1228                 struct buffer_head *bh;
1229                 unsigned int y;
1230
1231                 if (!extlen) {
1232                         int new = 0;
1233                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1234                         if (error)
1235                                 goto fail;
1236                 }
1237                 error = -EIO;
1238                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1239                 if (!bh)
1240                         goto fail;
1241                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1242                         brelse(bh);
1243                         goto fail;
1244                 }
1245
1246                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1247                      y++, slot++) {
1248                         struct gfs2_quota_change_host qc;
1249                         struct gfs2_quota_data *qd;
1250
1251                         gfs2_quota_change_in(&qc, bh->b_data +
1252                                           sizeof(struct gfs2_meta_header) +
1253                                           y * sizeof(struct gfs2_quota_change));
1254                         if (!qc.qc_change)
1255                                 continue;
1256
1257                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1258                                          qc.qc_id, &qd);
1259                         if (error) {
1260                                 brelse(bh);
1261                                 goto fail;
1262                         }
1263
1264                         set_bit(QDF_CHANGE, &qd->qd_flags);
1265                         qd->qd_change = qc.qc_change;
1266                         qd->qd_slot = slot;
1267                         qd->qd_slot_count = 1;
1268
1269                         spin_lock(&qd_lru_lock);
1270                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1271                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1272                         atomic_inc(&sdp->sd_quota_count);
1273                         spin_unlock(&qd_lru_lock);
1274
1275                         found++;
1276                 }
1277
1278                 brelse(bh);
1279                 dblock++;
1280                 extlen--;
1281         }
1282
1283         if (found)
1284                 fs_info(sdp, "found %u quota changes\n", found);
1285
1286         return 0;
1287
1288 fail:
1289         gfs2_quota_cleanup(sdp);
1290         return error;
1291 }
1292
1293 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1294 {
1295         struct list_head *head = &sdp->sd_quota_list;
1296         struct gfs2_quota_data *qd;
1297         unsigned int x;
1298
1299         spin_lock(&qd_lru_lock);
1300         while (!list_empty(head)) {
1301                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1302
1303                 if (atomic_read(&qd->qd_count) > 1 ||
1304                     (atomic_read(&qd->qd_count) &&
1305                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1306                         list_move(&qd->qd_list, head);
1307                         spin_unlock(&qd_lru_lock);
1308                         schedule();
1309                         spin_lock(&qd_lru_lock);
1310                         continue;
1311                 }
1312
1313                 list_del(&qd->qd_list);
1314                 /* Also remove if this qd exists in the reclaim list */
1315                 if (!list_empty(&qd->qd_reclaim)) {
1316                         list_del_init(&qd->qd_reclaim);
1317                         atomic_dec(&qd_lru_count);
1318                 }
1319                 atomic_dec(&sdp->sd_quota_count);
1320                 spin_unlock(&qd_lru_lock);
1321
1322                 if (!atomic_read(&qd->qd_count)) {
1323                         gfs2_assert_warn(sdp, !qd->qd_change);
1324                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1325                 } else
1326                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1327                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1328
1329                 gfs2_glock_put(qd->qd_gl);
1330                 kmem_cache_free(gfs2_quotad_cachep, qd);
1331
1332                 spin_lock(&qd_lru_lock);
1333         }
1334         spin_unlock(&qd_lru_lock);
1335
1336         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1337
1338         if (sdp->sd_quota_bitmap) {
1339                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1340                         kfree(sdp->sd_quota_bitmap[x]);
1341                 kfree(sdp->sd_quota_bitmap);
1342         }
1343 }
1344
1345 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1346 {
1347         if (error == 0 || error == -EROFS)
1348                 return;
1349         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1350                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1351 }
1352
1353 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1354                                int (*fxn)(struct super_block *sb, int type),
1355                                unsigned long t, unsigned long *timeo,
1356                                unsigned int *new_timeo)
1357 {
1358         if (t >= *timeo) {
1359                 int error = fxn(sdp->sd_vfs, 0);
1360                 quotad_error(sdp, msg, error);
1361                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1362         } else {
1363                 *timeo -= t;
1364         }
1365 }
1366
1367 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1368 {
1369         struct gfs2_inode *ip;
1370
1371         while(1) {
1372                 ip = NULL;
1373                 spin_lock(&sdp->sd_trunc_lock);
1374                 if (!list_empty(&sdp->sd_trunc_list)) {
1375                         ip = list_entry(sdp->sd_trunc_list.next,
1376                                         struct gfs2_inode, i_trunc_list);
1377                         list_del_init(&ip->i_trunc_list);
1378                 }
1379                 spin_unlock(&sdp->sd_trunc_lock);
1380                 if (ip == NULL)
1381                         return;
1382                 gfs2_glock_finish_truncate(ip);
1383         }
1384 }
1385
1386 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1387         if (!sdp->sd_statfs_force_sync) {
1388                 sdp->sd_statfs_force_sync = 1;
1389                 wake_up(&sdp->sd_quota_wait);
1390         }
1391 }
1392
1393
1394 /**
1395  * gfs2_quotad - Write cached quota changes into the quota file
1396  * @sdp: Pointer to GFS2 superblock
1397  *
1398  */
1399
1400 int gfs2_quotad(void *data)
1401 {
1402         struct gfs2_sbd *sdp = data;
1403         struct gfs2_tune *tune = &sdp->sd_tune;
1404         unsigned long statfs_timeo = 0;
1405         unsigned long quotad_timeo = 0;
1406         unsigned long t = 0;
1407         DEFINE_WAIT(wait);
1408         int empty;
1409
1410         while (!kthread_should_stop()) {
1411
1412                 /* Update the master statfs file */
1413                 if (sdp->sd_statfs_force_sync) {
1414                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1415                         quotad_error(sdp, "statfs", error);
1416                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1417                 }
1418                 else
1419                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1420                                            &statfs_timeo,
1421                                            &tune->gt_statfs_quantum);
1422
1423                 /* Update quota file */
1424                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1425                                    &quotad_timeo, &tune->gt_quota_quantum);
1426
1427                 /* Check for & recover partially truncated inodes */
1428                 quotad_check_trunc_list(sdp);
1429
1430                 if (freezing(current))
1431                         refrigerator();
1432                 t = min(quotad_timeo, statfs_timeo);
1433
1434                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1435                 spin_lock(&sdp->sd_trunc_lock);
1436                 empty = list_empty(&sdp->sd_trunc_list);
1437                 spin_unlock(&sdp->sd_trunc_lock);
1438                 if (empty && !sdp->sd_statfs_force_sync)
1439                         t -= schedule_timeout(t);
1440                 else
1441                         t = 0;
1442                 finish_wait(&sdp->sd_quota_wait, &wait);
1443         }
1444
1445         return 0;
1446 }
1447
1448 static int gfs2_quota_get_xstate(struct super_block *sb,
1449                                  struct fs_quota_stat *fqs)
1450 {
1451         struct gfs2_sbd *sdp = sb->s_fs_info;
1452
1453         memset(fqs, 0, sizeof(struct fs_quota_stat));
1454         fqs->qs_version = FS_QSTAT_VERSION;
1455
1456         switch (sdp->sd_args.ar_quota) {
1457         case GFS2_QUOTA_ON:
1458                 fqs->qs_flags |= (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1459                 /*FALLTHRU*/
1460         case GFS2_QUOTA_ACCOUNT:
1461                 fqs->qs_flags |= (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1462                 break;
1463         case GFS2_QUOTA_OFF:
1464                 break;
1465         }
1466
1467         if (sdp->sd_quota_inode) {
1468                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1469                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1470         }
1471         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1472         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1473         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1474         return 0;
1475 }
1476
1477 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1478                           struct fs_disk_quota *fdq)
1479 {
1480         struct gfs2_sbd *sdp = sb->s_fs_info;
1481         struct gfs2_quota_lvb *qlvb;
1482         struct gfs2_quota_data *qd;
1483         struct gfs2_holder q_gh;
1484         int error;
1485
1486         memset(fdq, 0, sizeof(struct fs_disk_quota));
1487
1488         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1489                 return -ESRCH; /* Crazy XFS error code */
1490
1491         if (type == USRQUOTA)
1492                 type = QUOTA_USER;
1493         else if (type == GRPQUOTA)
1494                 type = QUOTA_GROUP;
1495         else
1496                 return -EINVAL;
1497
1498         error = qd_get(sdp, type, id, &qd);
1499         if (error)
1500                 return error;
1501         error = do_glock(qd, FORCE, &q_gh);
1502         if (error)
1503                 goto out;
1504
1505         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1506         fdq->d_version = FS_DQUOT_VERSION;
1507         fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1508         fdq->d_id = id;
1509         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1510         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1511         fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1512
1513         gfs2_glock_dq_uninit(&q_gh);
1514 out:
1515         qd_put(qd);
1516         return error;
1517 }
1518
1519 /* GFS2 only supports a subset of the XFS fields */
1520 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1521
1522 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1523                           struct fs_disk_quota *fdq)
1524 {
1525         struct gfs2_sbd *sdp = sb->s_fs_info;
1526         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1527         struct gfs2_quota_data *qd;
1528         struct gfs2_holder q_gh, i_gh;
1529         unsigned int data_blocks, ind_blocks;
1530         unsigned int blocks = 0;
1531         int alloc_required;
1532         struct gfs2_alloc *al;
1533         loff_t offset;
1534         int error;
1535
1536         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1537                 return -ESRCH; /* Crazy XFS error code */
1538
1539         switch(type) {
1540         case USRQUOTA:
1541                 type = QUOTA_USER;
1542                 if (fdq->d_flags != XFS_USER_QUOTA)
1543                         return -EINVAL;
1544                 break;
1545         case GRPQUOTA:
1546                 type = QUOTA_GROUP;
1547                 if (fdq->d_flags != XFS_GROUP_QUOTA)
1548                         return -EINVAL;
1549                 break;
1550         default:
1551                 return -EINVAL;
1552         }
1553
1554         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1555                 return -EINVAL;
1556         if (fdq->d_id != id)
1557                 return -EINVAL;
1558
1559         error = qd_get(sdp, type, id, &qd);
1560         if (error)
1561                 return error;
1562
1563         mutex_lock(&ip->i_inode.i_mutex);
1564         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1565         if (error)
1566                 goto out_put;
1567         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1568         if (error)
1569                 goto out_q;
1570
1571         /* Check for existing entry, if none then alloc new blocks */
1572         error = update_qd(sdp, qd);
1573         if (error)
1574                 goto out_i;
1575
1576         /* If nothing has changed, this is a no-op */
1577         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1578             (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1579                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1580         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1581             (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1582                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1583         if (fdq->d_fieldmask == 0)
1584                 goto out_i;
1585
1586         offset = qd2offset(qd);
1587         error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1588                                           &alloc_required);
1589         if (error)
1590                 goto out_i;
1591         if (alloc_required) {
1592                 al = gfs2_alloc_get(ip);
1593                 if (al == NULL)
1594                         goto out_i;
1595                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1596                                        &data_blocks, &ind_blocks);
1597                 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1598                 error = gfs2_inplace_reserve(ip);
1599                 if (error)
1600                         goto out_alloc;
1601         }
1602
1603         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1604         if (error)
1605                 goto out_release;
1606
1607         /* Apply changes */
1608         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1609
1610         gfs2_trans_end(sdp);
1611 out_release:
1612         if (alloc_required) {
1613                 gfs2_inplace_release(ip);
1614 out_alloc:
1615                 gfs2_alloc_put(ip);
1616         }
1617 out_i:
1618         gfs2_glock_dq_uninit(&i_gh);
1619 out_q:
1620         gfs2_glock_dq_uninit(&q_gh);
1621 out_put:
1622         mutex_unlock(&ip->i_inode.i_mutex);
1623         qd_put(qd);
1624         return error;
1625 }
1626
1627 const struct quotactl_ops gfs2_quotactl_ops = {
1628         .quota_sync     = gfs2_quota_sync,
1629         .get_xstate     = gfs2_quota_get_xstate,
1630         .get_dqblk      = gfs2_get_dqblk,
1631         .set_dqblk      = gfs2_set_dqblk,
1632 };
1633