Pileus Git - ~andy/linux/blob - fs/gfs2/quota.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 /*
  11  * Quota change tags are associated with each transaction that allocates or
  12  * deallocates space.  Those changes are accumulated locally to each node (in a
  13  * per-node file) and then are periodically synced to the quota file.  This
  14  * avoids the bottleneck of constantly touching the quota file, but introduces
  15  * fuzziness in the current usage value of IDs that are being used on different
  16  * nodes in the cluster simultaneously.  So, it is possible for a user on
  17  * multiple nodes to overrun their quota, but that overrun is controlable.
  18  * Since quota tags are part of transactions, there is no need 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/mm.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/completion.h>
  44 #include <linux/buffer_head.h>
  45 #include <linux/sort.h>
  46 #include <linux/fs.h>
  47 #include <linux/bio.h>
  48 #include <linux/gfs2_ondisk.h>
  49 #include <linux/kthread.h>
  50 #include <linux/freezer.h>
  51 #include <linux/quota.h>
  52 #include <linux/dqblk_xfs.h>
  53
  54 #include "gfs2.h"
  55 #include "incore.h"
  56 #include "bmap.h"
  57 #include "glock.h"
  58 #include "glops.h"
  59 #include "log.h"
  60 #include "meta_io.h"
  61 #include "quota.h"
  62 #include "rgrp.h"
  63 #include "super.h"
  64 #include "trans.h"
  65 #include "inode.h"
  66 #include "util.h"
  67
  68 #define QUOTA_USER 1
  69 #define QUOTA_GROUP 0
  70
  71 struct gfs2_quota_change_host {
  72         u64 qc_change;
  73         u32 qc_flags; /* GFS2_QCF_... */
  74         u32 qc_id;
  75 };
  76
  77 static LIST_HEAD(qd_lru_list);
  78 static atomic_t qd_lru_count = ATOMIC_INIT(0);
  79 static DEFINE_SPINLOCK(qd_lru_lock);
  80
  81 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
  82 {
  83         struct gfs2_quota_data *qd;
  84         struct gfs2_sbd *sdp;
  85         int nr_to_scan = sc->nr_to_scan;
  86
  87         if (nr_to_scan == 0)
  88                 goto out;
  89
  90         if (!(sc->gfp_mask & __GFP_FS))
  91                 return -1;
  92
  93         spin_lock(&qd_lru_lock);
  94         while (nr_to_scan && !list_empty(&qd_lru_list)) {
  95                 qd = list_entry(qd_lru_list.next,
  96                                 struct gfs2_quota_data, qd_reclaim);
  97                 sdp = qd->qd_gl->gl_sbd;
  98
  99                 /* Free from the filesystem-specific list */
 100                 list_del(&qd->qd_list);
 101
 102                 gfs2_assert_warn(sdp, !qd->qd_change);
 103                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 104                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 105
 106                 gfs2_glock_put(qd->qd_gl);
 107                 atomic_dec(&sdp->sd_quota_count);
 108
 109                 /* Delete it from the common reclaim list */
 110                 list_del_init(&qd->qd_reclaim);
 111                 atomic_dec(&qd_lru_count);
 112                 spin_unlock(&qd_lru_lock);
 113                 kmem_cache_free(gfs2_quotad_cachep, qd);
 114                 spin_lock(&qd_lru_lock);
 115                 nr_to_scan--;
 116         }
 117         spin_unlock(&qd_lru_lock);
 118
 119 out:
 120         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 121 }
 122
 123 static u64 qd2offset(struct gfs2_quota_data *qd)
 124 {
 125         u64 offset;
 126
 127         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
 128         offset *= sizeof(struct gfs2_quota);
 129
 130         return offset;
 131 }
 132
 133 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
 134                     struct gfs2_quota_data **qdp)
 135 {
 136         struct gfs2_quota_data *qd;
 137         int error;
 138
 139         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 140         if (!qd)
 141                 return -ENOMEM;
 142
 143         atomic_set(&qd->qd_count, 1);
 144         qd->qd_id = id;
 145         if (user)
 146                 set_bit(QDF_USER, &qd->qd_flags);
 147         qd->qd_slot = -1;
 148         INIT_LIST_HEAD(&qd->qd_reclaim);
 149
 150         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
 151                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 152         if (error)
 153                 goto fail;
 154
 155         *qdp = qd;
 156
 157         return 0;
 158
 159 fail:
 160         kmem_cache_free(gfs2_quotad_cachep, qd);
 161         return error;
 162 }
 163
 164 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
 165                   struct gfs2_quota_data **qdp)
 166 {
 167         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 168         int error, found;
 169
 170         *qdp = NULL;
 171
 172         for (;;) {
 173                 found = 0;
 174                 spin_lock(&qd_lru_lock);
 175                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 176                         if (qd->qd_id == id &&
 177                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 178                                 if (!atomic_read(&qd->qd_count) &&
 179                                     !list_empty(&qd->qd_reclaim)) {
 180                                         /* Remove it from reclaim list */
 181                                         list_del_init(&qd->qd_reclaim);
 182                                         atomic_dec(&qd_lru_count);
 183                                 }
 184                                 atomic_inc(&qd->qd_count);
 185                                 found = 1;
 186                                 break;
 187                         }
 188                 }
 189
 190                 if (!found)
 191                         qd = NULL;
 192
 193                 if (!qd && new_qd) {
 194                         qd = new_qd;
 195                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 196                         atomic_inc(&sdp->sd_quota_count);
 197                         new_qd = NULL;
 198                 }
 199
 200                 spin_unlock(&qd_lru_lock);
 201
 202                 if (qd) {
 203                         if (new_qd) {
 204                                 gfs2_glock_put(new_qd->qd_gl);
 205                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 206                         }
 207                         *qdp = qd;
 208                         return 0;
 209                 }
 210
 211                 error = qd_alloc(sdp, user, id, &new_qd);
 212                 if (error)
 213                         return error;
 214         }
 215 }
 216
 217 static void qd_hold(struct gfs2_quota_data *qd)
 218 {
 219         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 220         gfs2_assert(sdp, atomic_read(&qd->qd_count));
 221         atomic_inc(&qd->qd_count);
 222 }
 223
 224 static void qd_put(struct gfs2_quota_data *qd)
 225 {
 226         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
 227                 /* Add to the reclaim list */
 228                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 229                 atomic_inc(&qd_lru_count);
 230                 spin_unlock(&qd_lru_lock);
 231         }
 232 }
 233
 234 static int slot_get(struct gfs2_quota_data *qd)
 235 {
 236         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 237         unsigned int c, o = 0, b;
 238         unsigned char byte = 0;
 239
 240         spin_lock(&qd_lru_lock);
 241
 242         if (qd->qd_slot_count++) {
 243                 spin_unlock(&qd_lru_lock);
 244                 return 0;
 245         }
 246
 247         for (c = 0; c < sdp->sd_quota_chunks; c++)
 248                 for (o = 0; o < PAGE_SIZE; o++) {
 249                         byte = sdp->sd_quota_bitmap[c][o];
 250                         if (byte != 0xFF)
 251                                 goto found;
 252                 }
 253
 254         goto fail;
 255
 256 found:
 257         for (b = 0; b < 8; b++)
 258                 if (!(byte & (1 << b)))
 259                         break;
 260         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 261
 262         if (qd->qd_slot >= sdp->sd_quota_slots)
 263                 goto fail;
 264
 265         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 266
 267         spin_unlock(&qd_lru_lock);
 268
 269         return 0;
 270
 271 fail:
 272         qd->qd_slot_count--;
 273         spin_unlock(&qd_lru_lock);
 274         return -ENOSPC;
 275 }
 276
 277 static void slot_hold(struct gfs2_quota_data *qd)
 278 {
 279         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 280
 281         spin_lock(&qd_lru_lock);
 282         gfs2_assert(sdp, qd->qd_slot_count);
 283         qd->qd_slot_count++;
 284         spin_unlock(&qd_lru_lock);
 285 }
 286
 287 static void slot_put(struct gfs2_quota_data *qd)
 288 {
 289         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 290
 291         spin_lock(&qd_lru_lock);
 292         gfs2_assert(sdp, qd->qd_slot_count);
 293         if (!--qd->qd_slot_count) {
 294                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 295                 qd->qd_slot = -1;
 296         }
 297         spin_unlock(&qd_lru_lock);
 298 }
 299
 300 static int bh_get(struct gfs2_quota_data *qd)
 301 {
 302         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 303         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 304         unsigned int block, offset;
 305         struct buffer_head *bh;
 306         int error;
 307         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 308
 309         mutex_lock(&sdp->sd_quota_mutex);
 310
 311         if (qd->qd_bh_count++) {
 312                 mutex_unlock(&sdp->sd_quota_mutex);
 313                 return 0;
 314         }
 315
 316         block = qd->qd_slot / sdp->sd_qc_per_block;
 317         offset = qd->qd_slot % sdp->sd_qc_per_block;
 318
 319         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 320         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 321         if (error)
 322                 goto fail;
 323         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 324         if (error)
 325                 goto fail;
 326         error = -EIO;
 327         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 328                 goto fail_brelse;
 329
 330         qd->qd_bh = bh;
 331         qd->qd_bh_qc = (struct gfs2_quota_change *)
 332                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 333                  offset * sizeof(struct gfs2_quota_change));
 334
 335         mutex_unlock(&sdp->sd_quota_mutex);
 336
 337         return 0;
 338
 339 fail_brelse:
 340         brelse(bh);
 341 fail:
 342         qd->qd_bh_count--;
 343         mutex_unlock(&sdp->sd_quota_mutex);
 344         return error;
 345 }
 346
 347 static void bh_put(struct gfs2_quota_data *qd)
 348 {
 349         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 350
 351         mutex_lock(&sdp->sd_quota_mutex);
 352         gfs2_assert(sdp, qd->qd_bh_count);
 353         if (!--qd->qd_bh_count) {
 354                 brelse(qd->qd_bh);
 355                 qd->qd_bh = NULL;
 356                 qd->qd_bh_qc = NULL;
 357         }
 358         mutex_unlock(&sdp->sd_quota_mutex);
 359 }
 360
 361 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 362 {
 363         struct gfs2_quota_data *qd = NULL;
 364         int error;
 365         int found = 0;
 366
 367         *qdp = NULL;
 368
 369         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 370                 return 0;
 371
 372         spin_lock(&qd_lru_lock);
 373
 374         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 375                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 376                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 377                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 378                         continue;
 379
 380                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 381
 382                 set_bit(QDF_LOCKED, &qd->qd_flags);
 383                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 384                 atomic_inc(&qd->qd_count);
 385                 qd->qd_change_sync = qd->qd_change;
 386                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 387                 qd->qd_slot_count++;
 388                 found = 1;
 389
 390                 break;
 391         }
 392
 393         if (!found)
 394                 qd = NULL;
 395
 396         spin_unlock(&qd_lru_lock);
 397
 398         if (qd) {
 399                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 400                 error = bh_get(qd);
 401                 if (error) {
 402                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 403                         slot_put(qd);
 404                         qd_put(qd);
 405                         return error;
 406                 }
 407         }
 408
 409         *qdp = qd;
 410
 411         return 0;
 412 }
 413
 414 static int qd_trylock(struct gfs2_quota_data *qd)
 415 {
 416         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 417
 418         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 419                 return 0;
 420
 421         spin_lock(&qd_lru_lock);
 422
 423         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 424             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 425                 spin_unlock(&qd_lru_lock);
 426                 return 0;
 427         }
 428
 429         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 430
 431         set_bit(QDF_LOCKED, &qd->qd_flags);
 432         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 433         atomic_inc(&qd->qd_count);
 434         qd->qd_change_sync = qd->qd_change;
 435         gfs2_assert_warn(sdp, qd->qd_slot_count);
 436         qd->qd_slot_count++;
 437
 438         spin_unlock(&qd_lru_lock);
 439
 440         gfs2_assert_warn(sdp, qd->qd_change_sync);
 441         if (bh_get(qd)) {
 442                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 443                 slot_put(qd);
 444                 qd_put(qd);
 445                 return 0;
 446         }
 447
 448         return 1;
 449 }
 450
 451 static void qd_unlock(struct gfs2_quota_data *qd)
 452 {
 453         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 454                          test_bit(QDF_LOCKED, &qd->qd_flags));
 455         clear_bit(QDF_LOCKED, &qd->qd_flags);
 456         bh_put(qd);
 457         slot_put(qd);
 458         qd_put(qd);
 459 }
 460
 461 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
 462                     struct gfs2_quota_data **qdp)
 463 {
 464         int error;
 465
 466         error = qd_get(sdp, user, id, qdp);
 467         if (error)
 468                 return error;
 469
 470         error = slot_get(*qdp);
 471         if (error)
 472                 goto fail;
 473
 474         error = bh_get(*qdp);
 475         if (error)
 476                 goto fail_slot;
 477
 478         return 0;
 479
 480 fail_slot:
 481         slot_put(*qdp);
 482 fail:
 483         qd_put(*qdp);
 484         return error;
 485 }
 486
 487 static void qdsb_put(struct gfs2_quota_data *qd)
 488 {
 489         bh_put(qd);
 490         slot_put(qd);
 491         qd_put(qd);
 492 }
 493
 494 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 495 {
 496         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 497         struct gfs2_quota_data **qd;
 498         int error;
 499
 500         if (ip->i_res == NULL) {
 501                 error = gfs2_rs_alloc(ip);
 502                 if (error)
 503                         return error;
 504         }
 505
 506         qd = ip->i_res->rs_qa_qd;
 507
 508         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 509             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 510                 return -EIO;
 511
 512         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 513                 return 0;
 514
 515         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
 516         if (error)
 517                 goto out;
 518         ip->i_res->rs_qa_qd_num++;
 519         qd++;
 520
 521         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
 522         if (error)
 523                 goto out;
 524         ip->i_res->rs_qa_qd_num++;
 525         qd++;
 526
 527         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 528                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
 529                 if (error)
 530                         goto out;
 531                 ip->i_res->rs_qa_qd_num++;
 532                 qd++;
 533         }
 534
 535         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 536                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
 537                 if (error)
 538                         goto out;
 539                 ip->i_res->rs_qa_qd_num++;
 540                 qd++;
 541         }
 542
 543 out:
 544         if (error)
 545                 gfs2_quota_unhold(ip);
 546         return error;
 547 }
 548
 549 void gfs2_quota_unhold(struct gfs2_inode *ip)
 550 {
 551         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 552         unsigned int x;
 553
 554         if (ip->i_res == NULL)
 555                 return;
 556         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 557
 558         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 559                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 560                 ip->i_res->rs_qa_qd[x] = NULL;
 561         }
 562         ip->i_res->rs_qa_qd_num = 0;
 563 }
 564
 565 static int sort_qd(const void *a, const void *b)
 566 {
 567         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 568         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 569
 570         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 571             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 572                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 573                         return -1;
 574                 else
 575                         return 1;
 576         }
 577         if (qd_a->qd_id < qd_b->qd_id)
 578                 return -1;
 579         if (qd_a->qd_id > qd_b->qd_id)
 580                 return 1;
 581
 582         return 0;
 583 }
 584
 585 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 586 {
 587         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 588         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 589         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 590         s64 x;
 591
 592         mutex_lock(&sdp->sd_quota_mutex);
 593         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 594
 595         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 596                 qc->qc_change = 0;
 597                 qc->qc_flags = 0;
 598                 if (test_bit(QDF_USER, &qd->qd_flags))
 599                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 600                 qc->qc_id = cpu_to_be32(qd->qd_id);
 601         }
 602
 603         x = be64_to_cpu(qc->qc_change) + change;
 604         qc->qc_change = cpu_to_be64(x);
 605
 606         spin_lock(&qd_lru_lock);
 607         qd->qd_change = x;
 608         spin_unlock(&qd_lru_lock);
 609
 610         if (!x) {
 611                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 612                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 613                 qc->qc_flags = 0;
 614                 qc->qc_id = 0;
 615                 slot_put(qd);
 616                 qd_put(qd);
 617         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 618                 qd_hold(qd);
 619                 slot_hold(qd);
 620         }
 621
 622         mutex_unlock(&sdp->sd_quota_mutex);
 623 }
 624
 625 /**
 626  * gfs2_adjust_quota - adjust record of current block usage
 627  * @ip: The quota inode
 628  * @loc: Offset of the entry in the quota file
 629  * @change: The amount of usage change to record
 630  * @qd: The quota data
 631  * @fdq: The updated limits to record
 632  *
 633  * This function was mostly borrowed from gfs2_block_truncate_page which was
 634  * in turn mostly borrowed from ext3
 635  *
 636  * Returns: 0 or -ve on error
 637  */
 638
 639 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 640                              s64 change, struct gfs2_quota_data *qd,
 641                              struct fs_disk_quota *fdq)
 642 {
 643         struct inode *inode = &ip->i_inode;
 644         struct gfs2_sbd *sdp = GFS2_SB(inode);
 645         struct address_space *mapping = inode->i_mapping;
 646         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 647         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 648         unsigned blocksize, iblock, pos;
 649         struct buffer_head *bh;
 650         struct page *page;
 651         void *kaddr, *ptr;
 652         struct gfs2_quota q, *qp;
 653         int err, nbytes;
 654         u64 size;
 655
 656         if (gfs2_is_stuffed(ip)) {
 657                 err = gfs2_unstuff_dinode(ip, NULL);
 658                 if (err)
 659                         return err;
 660         }
 661
 662         memset(&q, 0, sizeof(struct gfs2_quota));
 663         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 664         if (err < 0)
 665                 return err;
 666
 667         err = -EIO;
 668         qp = &q;
 669         qp->qu_value = be64_to_cpu(qp->qu_value);
 670         qp->qu_value += change;
 671         qp->qu_value = cpu_to_be64(qp->qu_value);
 672         qd->qd_qb.qb_value = qp->qu_value;
 673         if (fdq) {
 674                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 675                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 676                         qd->qd_qb.qb_warn = qp->qu_warn;
 677                 }
 678                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 679                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 680                         qd->qd_qb.qb_limit = qp->qu_limit;
 681                 }
 682                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 683                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 684                         qd->qd_qb.qb_value = qp->qu_value;
 685                 }
 686         }
 687
 688         /* Write the quota into the quota file on disk */
 689         ptr = qp;
 690         nbytes = sizeof(struct gfs2_quota);
 691 get_a_page:
 692         page = find_or_create_page(mapping, index, GFP_NOFS);
 693         if (!page)
 694                 return -ENOMEM;
 695
 696         blocksize = inode->i_sb->s_blocksize;
 697         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 698
 699         if (!page_has_buffers(page))
 700                 create_empty_buffers(page, blocksize, 0);
 701
 702         bh = page_buffers(page);
 703         pos = blocksize;
 704         while (offset >= pos) {
 705                 bh = bh->b_this_page;
 706                 iblock++;
 707                 pos += blocksize;
 708         }
 709
 710         if (!buffer_mapped(bh)) {
 711                 gfs2_block_map(inode, iblock, bh, 1);
 712                 if (!buffer_mapped(bh))
 713                         goto unlock_out;
 714                 /* If it's a newly allocated disk block for quota, zero it */
 715                 if (buffer_new(bh))
 716                         zero_user(page, pos - blocksize, bh->b_size);
 717         }
 718
 719         if (PageUptodate(page))
 720                 set_buffer_uptodate(bh);
 721
 722         if (!buffer_uptodate(bh)) {
 723                 ll_rw_block(READ | REQ_META, 1, &bh);
 724                 wait_on_buffer(bh);
 725                 if (!buffer_uptodate(bh))
 726                         goto unlock_out;
 727         }
 728
 729         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 730
 731         kaddr = kmap_atomic(page);
 732         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 733                 nbytes = PAGE_CACHE_SIZE - offset;
 734         memcpy(kaddr + offset, ptr, nbytes);
 735         flush_dcache_page(page);
 736         kunmap_atomic(kaddr);
 737         unlock_page(page);
 738         page_cache_release(page);
 739
 740         /* If quota straddles page boundary, we need to update the rest of the
 741          * quota at the beginning of the next page */
 742         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 743                 ptr = ptr + nbytes;
 744                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 745                 offset = 0;
 746                 index++;
 747                 goto get_a_page;
 748         }
 749
 750         size = loc + sizeof(struct gfs2_quota);
 751         if (size > inode->i_size)
 752                 i_size_write(inode, size);
 753         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 754         mark_inode_dirty(inode);
 755         return 0;
 756
 757 unlock_out:
 758         unlock_page(page);
 759         page_cache_release(page);
 760         return err;
 761 }
 762
 763 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 764 {
 765         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 766         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 767         unsigned int data_blocks, ind_blocks;
 768         struct gfs2_holder *ghs, i_gh;
 769         unsigned int qx, x;
 770         struct gfs2_quota_data *qd;
 771         unsigned reserved;
 772         loff_t offset;
 773         unsigned int nalloc = 0, blocks;
 774         int error;
 775
 776         error = gfs2_rs_alloc(ip);
 777         if (error)
 778                 return error;
 779
 780         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 781                               &data_blocks, &ind_blocks);
 782
 783         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 784         if (!ghs)
 785                 return -ENOMEM;
 786
 787         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 788         mutex_lock(&ip->i_inode.i_mutex);
 789         for (qx = 0; qx < num_qd; qx++) {
 790                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 791                                            GL_NOCACHE, &ghs[qx]);
 792                 if (error)
 793                         goto out;
 794         }
 795
 796         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 797         if (error)
 798                 goto out;
 799
 800         for (x = 0; x < num_qd; x++) {
 801                 offset = qd2offset(qda[x]);
 802                 if (gfs2_write_alloc_required(ip, offset,
 803                                               sizeof(struct gfs2_quota)))
 804                         nalloc++;
 805         }
 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         /* +3 in the end for unstuffing block, inode size update block
 814          * and another block in case quota straddles page boundary and
 815          * two blocks need to be updated instead of 1 */
 816         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 817
 818         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 819         error = gfs2_inplace_reserve(ip, reserved, 0);
 820         if (error)
 821                 goto out_alloc;
 822
 823         if (nalloc)
 824                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 825
 826         error = gfs2_trans_begin(sdp, blocks, 0);
 827         if (error)
 828                 goto out_ipres;
 829
 830         for (x = 0; x < num_qd; x++) {
 831                 qd = qda[x];
 832                 offset = qd2offset(qd);
 833                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 834                 if (error)
 835                         goto out_end_trans;
 836
 837                 do_qc(qd, -qd->qd_change_sync);
 838                 set_bit(QDF_REFRESH, &qd->qd_flags);
 839         }
 840
 841         error = 0;
 842
 843 out_end_trans:
 844         gfs2_trans_end(sdp);
 845 out_ipres:
 846         gfs2_inplace_release(ip);
 847 out_alloc:
 848         gfs2_glock_dq_uninit(&i_gh);
 849 out:
 850         while (qx--)
 851                 gfs2_glock_dq_uninit(&ghs[qx]);
 852         mutex_unlock(&ip->i_inode.i_mutex);
 853         kfree(ghs);
 854         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 855         return error;
 856 }
 857
 858 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 859 {
 860         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 861         struct gfs2_quota q;
 862         struct gfs2_quota_lvb *qlvb;
 863         loff_t pos;
 864         int error;
 865
 866         memset(&q, 0, sizeof(struct gfs2_quota));
 867         pos = qd2offset(qd);
 868         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 869         if (error < 0)
 870                 return error;
 871
 872         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 873         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 874         qlvb->__pad = 0;
 875         qlvb->qb_limit = q.qu_limit;
 876         qlvb->qb_warn = q.qu_warn;
 877         qlvb->qb_value = q.qu_value;
 878         qd->qd_qb = *qlvb;
 879
 880         return 0;
 881 }
 882
 883 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 884                     struct gfs2_holder *q_gh)
 885 {
 886         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 887         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 888         struct gfs2_holder i_gh;
 889         int error;
 890
 891 restart:
 892         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 893         if (error)
 894                 return error;
 895
 896         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 897
 898         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 899                 gfs2_glock_dq_uninit(q_gh);
 900                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 901                                            GL_NOCACHE, q_gh);
 902                 if (error)
 903                         return error;
 904
 905                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 906                 if (error)
 907                         goto fail;
 908
 909                 error = update_qd(sdp, qd);
 910                 if (error)
 911                         goto fail_gunlock;
 912
 913                 gfs2_glock_dq_uninit(&i_gh);
 914                 gfs2_glock_dq_uninit(q_gh);
 915                 force_refresh = 0;
 916                 goto restart;
 917         }
 918
 919         return 0;
 920
 921 fail_gunlock:
 922         gfs2_glock_dq_uninit(&i_gh);
 923 fail:
 924         gfs2_glock_dq_uninit(q_gh);
 925         return error;
 926 }
 927
 928 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 929 {
 930         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 931         struct gfs2_quota_data *qd;
 932         unsigned int x;
 933         int error = 0;
 934
 935         error = gfs2_quota_hold(ip, uid, gid);
 936         if (error)
 937                 return error;
 938
 939         if (capable(CAP_SYS_RESOURCE) ||
 940             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 941                 return 0;
 942
 943         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 944              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 945
 946         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 947                 int force = NO_FORCE;
 948                 qd = ip->i_res->rs_qa_qd[x];
 949                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 950                         force = FORCE;
 951                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 952                 if (error)
 953                         break;
 954         }
 955
 956         if (!error)
 957                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 958         else {
 959                 while (x--)
 960                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 961                 gfs2_quota_unhold(ip);
 962         }
 963
 964         return error;
 965 }
 966
 967 static int need_sync(struct gfs2_quota_data *qd)
 968 {
 969         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 970         struct gfs2_tune *gt = &sdp->sd_tune;
 971         s64 value;
 972         unsigned int num, den;
 973         int do_sync = 1;
 974
 975         if (!qd->qd_qb.qb_limit)
 976                 return 0;
 977
 978         spin_lock(&qd_lru_lock);
 979         value = qd->qd_change;
 980         spin_unlock(&qd_lru_lock);
 981
 982         spin_lock(&gt->gt_spin);
 983         num = gt->gt_quota_scale_num;
 984         den = gt->gt_quota_scale_den;
 985         spin_unlock(&gt->gt_spin);
 986
 987         if (value < 0)
 988                 do_sync = 0;
 989         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 990                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 991                 do_sync = 0;
 992         else {
 993                 value *= gfs2_jindex_size(sdp) * num;
 994                 value = div_s64(value, den);
 995                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 996                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 997                         do_sync = 0;
 998         }
 999
1000         return do_sync;
1001 }
1002
1003 void gfs2_quota_unlock(struct gfs2_inode *ip)
1004 {
1005         struct gfs2_quota_data *qda[4];
1006         unsigned int count = 0;
1007         unsigned int x;
1008
1009         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1010                 goto out;
1011
1012         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1013                 struct gfs2_quota_data *qd;
1014                 int sync;
1015
1016                 qd = ip->i_res->rs_qa_qd[x];
1017                 sync = need_sync(qd);
1018
1019                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1020
1021                 if (sync && qd_trylock(qd))
1022                         qda[count++] = qd;
1023         }
1024
1025         if (count) {
1026                 do_sync(count, qda);
1027                 for (x = 0; x < count; x++)
1028                         qd_unlock(qda[x]);
1029         }
1030
1031 out:
1032         gfs2_quota_unhold(ip);
1033 }
1034
1035 #define MAX_LINE 256
1036
1037 static int print_message(struct gfs2_quota_data *qd, char *type)
1038 {
1039         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1040
1041         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1042                sdp->sd_fsname, type,
1043                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1044                qd->qd_id);
1045
1046         return 0;
1047 }
1048
1049 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1050 {
1051         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1052         struct gfs2_quota_data *qd;
1053         s64 value;
1054         unsigned int x;
1055         int error = 0;
1056
1057         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1058                 return 0;
1059
1060         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1061                 return 0;
1062
1063         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1064                 qd = ip->i_res->rs_qa_qd[x];
1065
1066                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1067                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1068                         continue;
1069
1070                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1071                 spin_lock(&qd_lru_lock);
1072                 value += qd->qd_change;
1073                 spin_unlock(&qd_lru_lock);
1074
1075                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1076                         print_message(qd, "exceeded");
1077                         quota_send_warning(make_kqid(&init_user_ns,
1078                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1079                                                      USRQUOTA : GRPQUOTA,
1080                                                      qd->qd_id),
1081                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1082
1083                         error = -EDQUOT;
1084                         break;
1085                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1086                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1087                            time_after_eq(jiffies, qd->qd_last_warn +
1088                                          gfs2_tune_get(sdp,
1089                                                 gt_quota_warn_period) * HZ)) {
1090                         quota_send_warning(make_kqid(&init_user_ns,
1091                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1092                                                      USRQUOTA : GRPQUOTA,
1093                                                      qd->qd_id),
1094                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1095                         error = print_message(qd, "warning");
1096                         qd->qd_last_warn = jiffies;
1097                 }
1098         }
1099
1100         return error;
1101 }
1102
1103 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1104                        u32 uid, u32 gid)
1105 {
1106         struct gfs2_quota_data *qd;
1107         unsigned int x;
1108
1109         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1110                 return;
1111         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1112                 return;
1113
1114         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1115                 qd = ip->i_res->rs_qa_qd[x];
1116
1117                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1118                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1119                         do_qc(qd, change);
1120                 }
1121         }
1122 }
1123
1124 int gfs2_quota_sync(struct super_block *sb, int type)
1125 {
1126         struct gfs2_sbd *sdp = sb->s_fs_info;
1127         struct gfs2_quota_data **qda;
1128         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1129         unsigned int num_qd;
1130         unsigned int x;
1131         int error = 0;
1132
1133         sdp->sd_quota_sync_gen++;
1134
1135         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1136         if (!qda)
1137                 return -ENOMEM;
1138
1139         do {
1140                 num_qd = 0;
1141
1142                 for (;;) {
1143                         error = qd_fish(sdp, qda + num_qd);
1144                         if (error || !qda[num_qd])
1145                                 break;
1146                         if (++num_qd == max_qd)
1147                                 break;
1148                 }
1149
1150                 if (num_qd) {
1151                         if (!error)
1152                                 error = do_sync(num_qd, qda);
1153                         if (!error)
1154                                 for (x = 0; x < num_qd; x++)
1155                                         qda[x]->qd_sync_gen =
1156                                                 sdp->sd_quota_sync_gen;
1157
1158                         for (x = 0; x < num_qd; x++)
1159                                 qd_unlock(qda[x]);
1160                 }
1161         } while (!error && num_qd == max_qd);
1162
1163         kfree(qda);
1164
1165         return error;
1166 }
1167
1168 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1169 {
1170         return gfs2_quota_sync(sb, type);
1171 }
1172
1173 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1174 {
1175         struct gfs2_quota_data *qd;
1176         struct gfs2_holder q_gh;
1177         int error;
1178
1179         error = qd_get(sdp, user, id, &qd);
1180         if (error)
1181                 return error;
1182
1183         error = do_glock(qd, FORCE, &q_gh);
1184         if (!error)
1185                 gfs2_glock_dq_uninit(&q_gh);
1186
1187         qd_put(qd);
1188         return error;
1189 }
1190
1191 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1192 {
1193         const struct gfs2_quota_change *str = buf;
1194
1195         qc->qc_change = be64_to_cpu(str->qc_change);
1196         qc->qc_flags = be32_to_cpu(str->qc_flags);
1197         qc->qc_id = be32_to_cpu(str->qc_id);
1198 }
1199
1200 int gfs2_quota_init(struct gfs2_sbd *sdp)
1201 {
1202         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1203         u64 size = i_size_read(sdp->sd_qc_inode);
1204         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1205         unsigned int x, slot = 0;
1206         unsigned int found = 0;
1207         u64 dblock;
1208         u32 extlen = 0;
1209         int error;
1210
1211         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1212                 return -EIO;
1213
1214         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1215         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1216
1217         error = -ENOMEM;
1218
1219         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1220                                        sizeof(unsigned char *), GFP_NOFS);
1221         if (!sdp->sd_quota_bitmap)
1222                 return error;
1223
1224         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1225                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1226                 if (!sdp->sd_quota_bitmap[x])
1227                         goto fail;
1228         }
1229
1230         for (x = 0; x < blocks; x++) {
1231                 struct buffer_head *bh;
1232                 unsigned int y;
1233
1234                 if (!extlen) {
1235                         int new = 0;
1236                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1237                         if (error)
1238                                 goto fail;
1239                 }
1240                 error = -EIO;
1241                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1242                 if (!bh)
1243                         goto fail;
1244                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1245                         brelse(bh);
1246                         goto fail;
1247                 }
1248
1249                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1250                      y++, slot++) {
1251                         struct gfs2_quota_change_host qc;
1252                         struct gfs2_quota_data *qd;
1253
1254                         gfs2_quota_change_in(&qc, bh->b_data +
1255                                           sizeof(struct gfs2_meta_header) +
1256                                           y * sizeof(struct gfs2_quota_change));
1257                         if (!qc.qc_change)
1258                                 continue;
1259
1260                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1261                                          qc.qc_id, &qd);
1262                         if (error) {
1263                                 brelse(bh);
1264                                 goto fail;
1265                         }
1266
1267                         set_bit(QDF_CHANGE, &qd->qd_flags);
1268                         qd->qd_change = qc.qc_change;
1269                         qd->qd_slot = slot;
1270                         qd->qd_slot_count = 1;
1271
1272                         spin_lock(&qd_lru_lock);
1273                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1274                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1275                         atomic_inc(&sdp->sd_quota_count);
1276                         spin_unlock(&qd_lru_lock);
1277
1278                         found++;
1279                 }
1280
1281                 brelse(bh);
1282                 dblock++;
1283                 extlen--;
1284         }
1285
1286         if (found)
1287                 fs_info(sdp, "found %u quota changes\n", found);
1288
1289         return 0;
1290
1291 fail:
1292         gfs2_quota_cleanup(sdp);
1293         return error;
1294 }
1295
1296 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1297 {
1298         struct list_head *head = &sdp->sd_quota_list;
1299         struct gfs2_quota_data *qd;
1300         unsigned int x;
1301
1302         spin_lock(&qd_lru_lock);
1303         while (!list_empty(head)) {
1304                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1305
1306                 if (atomic_read(&qd->qd_count) > 1 ||
1307                     (atomic_read(&qd->qd_count) &&
1308                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1309                         list_move(&qd->qd_list, head);
1310                         spin_unlock(&qd_lru_lock);
1311                         schedule();
1312                         spin_lock(&qd_lru_lock);
1313                         continue;
1314                 }
1315
1316                 list_del(&qd->qd_list);
1317                 /* Also remove if this qd exists in the reclaim list */
1318                 if (!list_empty(&qd->qd_reclaim)) {
1319                         list_del_init(&qd->qd_reclaim);
1320                         atomic_dec(&qd_lru_count);
1321                 }
1322                 atomic_dec(&sdp->sd_quota_count);
1323                 spin_unlock(&qd_lru_lock);
1324
1325                 if (!atomic_read(&qd->qd_count)) {
1326                         gfs2_assert_warn(sdp, !qd->qd_change);
1327                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1328                 } else
1329                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1330                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1331
1332                 gfs2_glock_put(qd->qd_gl);
1333                 kmem_cache_free(gfs2_quotad_cachep, qd);
1334
1335                 spin_lock(&qd_lru_lock);
1336         }
1337         spin_unlock(&qd_lru_lock);
1338
1339         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1340
1341         if (sdp->sd_quota_bitmap) {
1342                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1343                         kfree(sdp->sd_quota_bitmap[x]);
1344                 kfree(sdp->sd_quota_bitmap);
1345         }
1346 }
1347
1348 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1349 {
1350         if (error == 0 || error == -EROFS)
1351                 return;
1352         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1353                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1354 }
1355
1356 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1357                                int (*fxn)(struct super_block *sb, int type),
1358                                unsigned long t, unsigned long *timeo,
1359                                unsigned int *new_timeo)
1360 {
1361         if (t >= *timeo) {
1362                 int error = fxn(sdp->sd_vfs, 0);
1363                 quotad_error(sdp, msg, error);
1364                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1365         } else {
1366                 *timeo -= t;
1367         }
1368 }
1369
1370 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1371 {
1372         struct gfs2_inode *ip;
1373
1374         while(1) {
1375                 ip = NULL;
1376                 spin_lock(&sdp->sd_trunc_lock);
1377                 if (!list_empty(&sdp->sd_trunc_list)) {
1378                         ip = list_entry(sdp->sd_trunc_list.next,
1379                                         struct gfs2_inode, i_trunc_list);
1380                         list_del_init(&ip->i_trunc_list);
1381                 }
1382                 spin_unlock(&sdp->sd_trunc_lock);
1383                 if (ip == NULL)
1384                         return;
1385                 gfs2_glock_finish_truncate(ip);
1386         }
1387 }
1388
1389 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1390         if (!sdp->sd_statfs_force_sync) {
1391                 sdp->sd_statfs_force_sync = 1;
1392                 wake_up(&sdp->sd_quota_wait);
1393         }
1394 }
1395
1396
1397 /**
1398  * gfs2_quotad - Write cached quota changes into the quota file
1399  * @sdp: Pointer to GFS2 superblock
1400  *
1401  */
1402
1403 int gfs2_quotad(void *data)
1404 {
1405         struct gfs2_sbd *sdp = data;
1406         struct gfs2_tune *tune = &sdp->sd_tune;
1407         unsigned long statfs_timeo = 0;
1408         unsigned long quotad_timeo = 0;
1409         unsigned long t = 0;
1410         DEFINE_WAIT(wait);
1411         int empty;
1412
1413         while (!kthread_should_stop()) {
1414
1415                 /* Update the master statfs file */
1416                 if (sdp->sd_statfs_force_sync) {
1417                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1418                         quotad_error(sdp, "statfs", error);
1419                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1420                 }
1421                 else
1422                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1423                                            &statfs_timeo,
1424                                            &tune->gt_statfs_quantum);
1425
1426                 /* Update quota file */
1427                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1428                                    &quotad_timeo, &tune->gt_quota_quantum);
1429
1430                 /* Check for & recover partially truncated inodes */
1431                 quotad_check_trunc_list(sdp);
1432
1433                 try_to_freeze();
1434
1435                 t = min(quotad_timeo, statfs_timeo);
1436
1437                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1438                 spin_lock(&sdp->sd_trunc_lock);
1439                 empty = list_empty(&sdp->sd_trunc_list);
1440                 spin_unlock(&sdp->sd_trunc_lock);
1441                 if (empty && !sdp->sd_statfs_force_sync)
1442                         t -= schedule_timeout(t);
1443                 else
1444                         t = 0;
1445                 finish_wait(&sdp->sd_quota_wait, &wait);
1446         }
1447
1448         return 0;
1449 }
1450
1451 static int gfs2_quota_get_xstate(struct super_block *sb,
1452                                  struct fs_quota_stat *fqs)
1453 {
1454         struct gfs2_sbd *sdp = sb->s_fs_info;
1455
1456         memset(fqs, 0, sizeof(struct fs_quota_stat));
1457         fqs->qs_version = FS_QSTAT_VERSION;
1458
1459         switch (sdp->sd_args.ar_quota) {
1460         case GFS2_QUOTA_ON:
1461                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1462                 /*FALLTHRU*/
1463         case GFS2_QUOTA_ACCOUNT:
1464                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1465                 break;
1466         case GFS2_QUOTA_OFF:
1467                 break;
1468         }
1469
1470         if (sdp->sd_quota_inode) {
1471                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1472                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1473         }
1474         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1475         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1476         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1477         return 0;
1478 }
1479
1480 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1481                           struct fs_disk_quota *fdq)
1482 {
1483         struct gfs2_sbd *sdp = sb->s_fs_info;
1484         struct gfs2_quota_lvb *qlvb;
1485         struct gfs2_quota_data *qd;
1486         struct gfs2_holder q_gh;
1487         int error;
1488         int type;
1489
1490         memset(fdq, 0, sizeof(struct fs_disk_quota));
1491
1492         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1493                 return -ESRCH; /* Crazy XFS error code */
1494
1495         if (qid.type == USRQUOTA)
1496                 type = QUOTA_USER;
1497         else if (qid.type == GRPQUOTA)
1498                 type = QUOTA_GROUP;
1499         else
1500                 return -EINVAL;
1501
1502         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1503         if (error)
1504                 return error;
1505         error = do_glock(qd, FORCE, &q_gh);
1506         if (error)
1507                 goto out;
1508
1509         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1510         fdq->d_version = FS_DQUOT_VERSION;
1511         fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1512         fdq->d_id = from_kqid(&init_user_ns, qid);
1513         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1514         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1515         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1516
1517         gfs2_glock_dq_uninit(&q_gh);
1518 out:
1519         qd_put(qd);
1520         return error;
1521 }
1522
1523 /* GFS2 only supports a subset of the XFS fields */
1524 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1525
1526 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1527                           struct fs_disk_quota *fdq)
1528 {
1529         struct gfs2_sbd *sdp = sb->s_fs_info;
1530         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1531         struct gfs2_quota_data *qd;
1532         struct gfs2_holder q_gh, i_gh;
1533         unsigned int data_blocks, ind_blocks;
1534         unsigned int blocks = 0;
1535         int alloc_required;
1536         loff_t offset;
1537         int error;
1538         int type;
1539
1540         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541                 return -ESRCH; /* Crazy XFS error code */
1542
1543         switch(qid.type) {
1544         case USRQUOTA:
1545                 type = QUOTA_USER;
1546                 if (fdq->d_flags != FS_USER_QUOTA)
1547                         return -EINVAL;
1548                 break;
1549         case GRPQUOTA:
1550                 type = QUOTA_GROUP;
1551                 if (fdq->d_flags != FS_GROUP_QUOTA)
1552                         return -EINVAL;
1553                 break;
1554         default:
1555                 return -EINVAL;
1556         }
1557
1558         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1559                 return -EINVAL;
1560         if (fdq->d_id != from_kqid(&init_user_ns, qid))
1561                 return -EINVAL;
1562
1563         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1564         if (error)
1565                 return error;
1566
1567         error = gfs2_rs_alloc(ip);
1568         if (error)
1569                 goto out_put;
1570
1571         mutex_lock(&ip->i_inode.i_mutex);
1572         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1573         if (error)
1574                 goto out_unlockput;
1575         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1576         if (error)
1577                 goto out_q;
1578
1579         /* Check for existing entry, if none then alloc new blocks */
1580         error = update_qd(sdp, qd);
1581         if (error)
1582                 goto out_i;
1583
1584         /* If nothing has changed, this is a no-op */
1585         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1586             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1587                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1588
1589         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1590             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1591                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1592
1593         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1594             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1595                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1596
1597         if (fdq->d_fieldmask == 0)
1598                 goto out_i;
1599
1600         offset = qd2offset(qd);
1601         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1602         if (gfs2_is_stuffed(ip))
1603                 alloc_required = 1;
1604         if (alloc_required) {
1605                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1606                                        &data_blocks, &ind_blocks);
1607                 blocks = 1 + data_blocks + ind_blocks;
1608                 error = gfs2_inplace_reserve(ip, blocks, 0);
1609                 if (error)
1610                         goto out_i;
1611                 blocks += gfs2_rg_blocks(ip, blocks);
1612         }
1613
1614         /* Some quotas span block boundaries and can update two blocks,
1615            adding an extra block to the transaction to handle such quotas */
1616         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1617         if (error)
1618                 goto out_release;
1619
1620         /* Apply changes */
1621         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1622
1623         gfs2_trans_end(sdp);
1624 out_release:
1625         if (alloc_required)
1626                 gfs2_inplace_release(ip);
1627 out_i:
1628         gfs2_glock_dq_uninit(&i_gh);
1629 out_q:
1630         gfs2_glock_dq_uninit(&q_gh);
1631 out_unlockput:
1632         mutex_unlock(&ip->i_inode.i_mutex);
1633 out_put:
1634         qd_put(qd);
1635         return error;
1636 }
1637
1638 const struct quotactl_ops gfs2_quotactl_ops = {
1639         .quota_sync     = gfs2_quota_sync,
1640         .get_xstate     = gfs2_quota_get_xstate,
1641         .get_dqblk      = gfs2_get_dqblk,
1642         .set_dqblk      = gfs2_set_dqblk,
1643 };