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                 gfs2_rs_alloc(ip);
 502
 503         qd = ip->i_res->rs_qa_qd;
 504
 505         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 506             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 507                 return -EIO;
 508
 509         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 510                 return 0;
 511
 512         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
 513         if (error)
 514                 goto out;
 515         ip->i_res->rs_qa_qd_num++;
 516         qd++;
 517
 518         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
 519         if (error)
 520                 goto out;
 521         ip->i_res->rs_qa_qd_num++;
 522         qd++;
 523
 524         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 525                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
 526                 if (error)
 527                         goto out;
 528                 ip->i_res->rs_qa_qd_num++;
 529                 qd++;
 530         }
 531
 532         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 533                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
 534                 if (error)
 535                         goto out;
 536                 ip->i_res->rs_qa_qd_num++;
 537                 qd++;
 538         }
 539
 540 out:
 541         if (error)
 542                 gfs2_quota_unhold(ip);
 543         return error;
 544 }
 545
 546 void gfs2_quota_unhold(struct gfs2_inode *ip)
 547 {
 548         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 549         unsigned int x;
 550
 551         if (ip->i_res == NULL)
 552                 return;
 553         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 554
 555         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 556                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 557                 ip->i_res->rs_qa_qd[x] = NULL;
 558         }
 559         ip->i_res->rs_qa_qd_num = 0;
 560 }
 561
 562 static int sort_qd(const void *a, const void *b)
 563 {
 564         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 565         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 566
 567         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 568             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 569                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 570                         return -1;
 571                 else
 572                         return 1;
 573         }
 574         if (qd_a->qd_id < qd_b->qd_id)
 575                 return -1;
 576         if (qd_a->qd_id > qd_b->qd_id)
 577                 return 1;
 578
 579         return 0;
 580 }
 581
 582 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 583 {
 584         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 585         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 586         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 587         s64 x;
 588
 589         mutex_lock(&sdp->sd_quota_mutex);
 590         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 591
 592         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 593                 qc->qc_change = 0;
 594                 qc->qc_flags = 0;
 595                 if (test_bit(QDF_USER, &qd->qd_flags))
 596                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 597                 qc->qc_id = cpu_to_be32(qd->qd_id);
 598         }
 599
 600         x = be64_to_cpu(qc->qc_change) + change;
 601         qc->qc_change = cpu_to_be64(x);
 602
 603         spin_lock(&qd_lru_lock);
 604         qd->qd_change = x;
 605         spin_unlock(&qd_lru_lock);
 606
 607         if (!x) {
 608                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 609                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 610                 qc->qc_flags = 0;
 611                 qc->qc_id = 0;
 612                 slot_put(qd);
 613                 qd_put(qd);
 614         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 615                 qd_hold(qd);
 616                 slot_hold(qd);
 617         }
 618
 619         mutex_unlock(&sdp->sd_quota_mutex);
 620 }
 621
 622 /**
 623  * gfs2_adjust_quota - adjust record of current block usage
 624  * @ip: The quota inode
 625  * @loc: Offset of the entry in the quota file
 626  * @change: The amount of usage change to record
 627  * @qd: The quota data
 628  * @fdq: The updated limits to record
 629  *
 630  * This function was mostly borrowed from gfs2_block_truncate_page which was
 631  * in turn mostly borrowed from ext3
 632  *
 633  * Returns: 0 or -ve on error
 634  */
 635
 636 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 637                              s64 change, struct gfs2_quota_data *qd,
 638                              struct fs_disk_quota *fdq)
 639 {
 640         struct inode *inode = &ip->i_inode;
 641         struct gfs2_sbd *sdp = GFS2_SB(inode);
 642         struct address_space *mapping = inode->i_mapping;
 643         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 644         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 645         unsigned blocksize, iblock, pos;
 646         struct buffer_head *bh;
 647         struct page *page;
 648         void *kaddr, *ptr;
 649         struct gfs2_quota q, *qp;
 650         int err, nbytes;
 651         u64 size;
 652
 653         if (gfs2_is_stuffed(ip)) {
 654                 err = gfs2_unstuff_dinode(ip, NULL);
 655                 if (err)
 656                         return err;
 657         }
 658
 659         memset(&q, 0, sizeof(struct gfs2_quota));
 660         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 661         if (err < 0)
 662                 return err;
 663
 664         err = -EIO;
 665         qp = &q;
 666         qp->qu_value = be64_to_cpu(qp->qu_value);
 667         qp->qu_value += change;
 668         qp->qu_value = cpu_to_be64(qp->qu_value);
 669         qd->qd_qb.qb_value = qp->qu_value;
 670         if (fdq) {
 671                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 672                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 673                         qd->qd_qb.qb_warn = qp->qu_warn;
 674                 }
 675                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 676                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 677                         qd->qd_qb.qb_limit = qp->qu_limit;
 678                 }
 679                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 680                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 681                         qd->qd_qb.qb_value = qp->qu_value;
 682                 }
 683         }
 684
 685         /* Write the quota into the quota file on disk */
 686         ptr = qp;
 687         nbytes = sizeof(struct gfs2_quota);
 688 get_a_page:
 689         page = find_or_create_page(mapping, index, GFP_NOFS);
 690         if (!page)
 691                 return -ENOMEM;
 692
 693         blocksize = inode->i_sb->s_blocksize;
 694         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 695
 696         if (!page_has_buffers(page))
 697                 create_empty_buffers(page, blocksize, 0);
 698
 699         bh = page_buffers(page);
 700         pos = blocksize;
 701         while (offset >= pos) {
 702                 bh = bh->b_this_page;
 703                 iblock++;
 704                 pos += blocksize;
 705         }
 706
 707         if (!buffer_mapped(bh)) {
 708                 gfs2_block_map(inode, iblock, bh, 1);
 709                 if (!buffer_mapped(bh))
 710                         goto unlock_out;
 711                 /* If it's a newly allocated disk block for quota, zero it */
 712                 if (buffer_new(bh))
 713                         zero_user(page, pos - blocksize, bh->b_size);
 714         }
 715
 716         if (PageUptodate(page))
 717                 set_buffer_uptodate(bh);
 718
 719         if (!buffer_uptodate(bh)) {
 720                 ll_rw_block(READ | REQ_META, 1, &bh);
 721                 wait_on_buffer(bh);
 722                 if (!buffer_uptodate(bh))
 723                         goto unlock_out;
 724         }
 725
 726         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 727
 728         kaddr = kmap_atomic(page);
 729         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 730                 nbytes = PAGE_CACHE_SIZE - offset;
 731         memcpy(kaddr + offset, ptr, nbytes);
 732         flush_dcache_page(page);
 733         kunmap_atomic(kaddr);
 734         unlock_page(page);
 735         page_cache_release(page);
 736
 737         /* If quota straddles page boundary, we need to update the rest of the
 738          * quota at the beginning of the next page */
 739         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 740                 ptr = ptr + nbytes;
 741                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 742                 offset = 0;
 743                 index++;
 744                 goto get_a_page;
 745         }
 746
 747         size = loc + sizeof(struct gfs2_quota);
 748         if (size > inode->i_size)
 749                 i_size_write(inode, size);
 750         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 751         mark_inode_dirty(inode);
 752         return 0;
 753
 754 unlock_out:
 755         unlock_page(page);
 756         page_cache_release(page);
 757         return err;
 758 }
 759
 760 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 761 {
 762         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 763         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 764         unsigned int data_blocks, ind_blocks;
 765         struct gfs2_holder *ghs, i_gh;
 766         unsigned int qx, x;
 767         struct gfs2_quota_data *qd;
 768         unsigned reserved;
 769         loff_t offset;
 770         unsigned int nalloc = 0, blocks;
 771         int error;
 772
 773         error = gfs2_rs_alloc(ip);
 774         if (error)
 775                 return error;
 776
 777         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 778                               &data_blocks, &ind_blocks);
 779
 780         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 781         if (!ghs)
 782                 return -ENOMEM;
 783
 784         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 785         mutex_lock(&ip->i_inode.i_mutex);
 786         for (qx = 0; qx < num_qd; qx++) {
 787                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 788                                            GL_NOCACHE, &ghs[qx]);
 789                 if (error)
 790                         goto out;
 791         }
 792
 793         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 794         if (error)
 795                 goto out;
 796
 797         for (x = 0; x < num_qd; x++) {
 798                 offset = qd2offset(qda[x]);
 799                 if (gfs2_write_alloc_required(ip, offset,
 800                                               sizeof(struct gfs2_quota)))
 801                         nalloc++;
 802         }
 803
 804         /*
 805          * 1 blk for unstuffing inode if stuffed. We add this extra
 806          * block to the reservation unconditionally. If the inode
 807          * doesn't need unstuffing, the block will be released to the
 808          * rgrp since it won't be allocated during the transaction
 809          */
 810         /* +3 in the end for unstuffing block, inode size update block
 811          * and another block in case quota straddles page boundary and
 812          * two blocks need to be updated instead of 1 */
 813         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 814
 815         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 816         error = gfs2_inplace_reserve(ip, reserved);
 817         if (error)
 818                 goto out_alloc;
 819
 820         if (nalloc)
 821                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 822
 823         error = gfs2_trans_begin(sdp, blocks, 0);
 824         if (error)
 825                 goto out_ipres;
 826
 827         for (x = 0; x < num_qd; x++) {
 828                 qd = qda[x];
 829                 offset = qd2offset(qd);
 830                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 831                 if (error)
 832                         goto out_end_trans;
 833
 834                 do_qc(qd, -qd->qd_change_sync);
 835                 set_bit(QDF_REFRESH, &qd->qd_flags);
 836         }
 837
 838         error = 0;
 839
 840 out_end_trans:
 841         gfs2_trans_end(sdp);
 842 out_ipres:
 843         gfs2_inplace_release(ip);
 844 out_alloc:
 845         gfs2_glock_dq_uninit(&i_gh);
 846 out:
 847         while (qx--)
 848                 gfs2_glock_dq_uninit(&ghs[qx]);
 849         mutex_unlock(&ip->i_inode.i_mutex);
 850         kfree(ghs);
 851         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 852         return error;
 853 }
 854
 855 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 856 {
 857         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 858         struct gfs2_quota q;
 859         struct gfs2_quota_lvb *qlvb;
 860         loff_t pos;
 861         int error;
 862
 863         memset(&q, 0, sizeof(struct gfs2_quota));
 864         pos = qd2offset(qd);
 865         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 866         if (error < 0)
 867                 return error;
 868
 869         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 870         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 871         qlvb->__pad = 0;
 872         qlvb->qb_limit = q.qu_limit;
 873         qlvb->qb_warn = q.qu_warn;
 874         qlvb->qb_value = q.qu_value;
 875         qd->qd_qb = *qlvb;
 876
 877         return 0;
 878 }
 879
 880 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 881                     struct gfs2_holder *q_gh)
 882 {
 883         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 884         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 885         struct gfs2_holder i_gh;
 886         int error;
 887
 888 restart:
 889         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 890         if (error)
 891                 return error;
 892
 893         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 894
 895         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 896                 gfs2_glock_dq_uninit(q_gh);
 897                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 898                                            GL_NOCACHE, q_gh);
 899                 if (error)
 900                         return error;
 901
 902                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 903                 if (error)
 904                         goto fail;
 905
 906                 error = update_qd(sdp, qd);
 907                 if (error)
 908                         goto fail_gunlock;
 909
 910                 gfs2_glock_dq_uninit(&i_gh);
 911                 gfs2_glock_dq_uninit(q_gh);
 912                 force_refresh = 0;
 913                 goto restart;
 914         }
 915
 916         return 0;
 917
 918 fail_gunlock:
 919         gfs2_glock_dq_uninit(&i_gh);
 920 fail:
 921         gfs2_glock_dq_uninit(q_gh);
 922         return error;
 923 }
 924
 925 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 926 {
 927         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 928         struct gfs2_quota_data *qd;
 929         unsigned int x;
 930         int error = 0;
 931
 932         error = gfs2_quota_hold(ip, uid, gid);
 933         if (error)
 934                 return error;
 935
 936         if (capable(CAP_SYS_RESOURCE) ||
 937             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 938                 return 0;
 939
 940         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 941              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 942
 943         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 944                 int force = NO_FORCE;
 945                 qd = ip->i_res->rs_qa_qd[x];
 946                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 947                         force = FORCE;
 948                 error = do_glock(qd, force, &ip->i_res->rs_qa_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(&ip->i_res->rs_qa_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_quota_data *qda[4];
1003         unsigned int count = 0;
1004         unsigned int x;
1005
1006         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1007                 goto out;
1008
1009         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1010                 struct gfs2_quota_data *qd;
1011                 int sync;
1012
1013                 qd = ip->i_res->rs_qa_qd[x];
1014                 sync = need_sync(qd);
1015
1016                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1017
1018                 if (sync && qd_trylock(qd))
1019                         qda[count++] = qd;
1020         }
1021
1022         if (count) {
1023                 do_sync(count, qda);
1024                 for (x = 0; x < count; x++)
1025                         qd_unlock(qda[x]);
1026         }
1027
1028 out:
1029         gfs2_quota_unhold(ip);
1030 }
1031
1032 #define MAX_LINE 256
1033
1034 static int print_message(struct gfs2_quota_data *qd, char *type)
1035 {
1036         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1037
1038         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1039                sdp->sd_fsname, type,
1040                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1041                qd->qd_id);
1042
1043         return 0;
1044 }
1045
1046 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1047 {
1048         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1049         struct gfs2_quota_data *qd;
1050         s64 value;
1051         unsigned int x;
1052         int error = 0;
1053
1054         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1055                 return 0;
1056
1057         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1058                 return 0;
1059
1060         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1061                 qd = ip->i_res->rs_qa_qd[x];
1062
1063                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1064                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1065                         continue;
1066
1067                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1068                 spin_lock(&qd_lru_lock);
1069                 value += qd->qd_change;
1070                 spin_unlock(&qd_lru_lock);
1071
1072                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1073                         print_message(qd, "exceeded");
1074                         quota_send_warning(make_kqid(&init_user_ns,
1075                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1076                                                      USRQUOTA : GRPQUOTA,
1077                                                      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(make_kqid(&init_user_ns,
1088                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1089                                                      USRQUOTA : GRPQUOTA,
1090                                                      qd->qd_id),
1091                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1092                         error = print_message(qd, "warning");
1093                         qd->qd_last_warn = jiffies;
1094                 }
1095         }
1096
1097         return error;
1098 }
1099
1100 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1101                        u32 uid, u32 gid)
1102 {
1103         struct gfs2_quota_data *qd;
1104         unsigned int x;
1105
1106         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1107                 return;
1108         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1109                 return;
1110
1111         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1112                 qd = ip->i_res->rs_qa_qd[x];
1113
1114                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1115                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1116                         do_qc(qd, change);
1117                 }
1118         }
1119 }
1120
1121 int gfs2_quota_sync(struct super_block *sb, int type)
1122 {
1123         struct gfs2_sbd *sdp = sb->s_fs_info;
1124         struct gfs2_quota_data **qda;
1125         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1126         unsigned int num_qd;
1127         unsigned int x;
1128         int error = 0;
1129
1130         sdp->sd_quota_sync_gen++;
1131
1132         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1133         if (!qda)
1134                 return -ENOMEM;
1135
1136         do {
1137                 num_qd = 0;
1138
1139                 for (;;) {
1140                         error = qd_fish(sdp, qda + num_qd);
1141                         if (error || !qda[num_qd])
1142                                 break;
1143                         if (++num_qd == max_qd)
1144                                 break;
1145                 }
1146
1147                 if (num_qd) {
1148                         if (!error)
1149                                 error = do_sync(num_qd, qda);
1150                         if (!error)
1151                                 for (x = 0; x < num_qd; x++)
1152                                         qda[x]->qd_sync_gen =
1153                                                 sdp->sd_quota_sync_gen;
1154
1155                         for (x = 0; x < num_qd; x++)
1156                                 qd_unlock(qda[x]);
1157                 }
1158         } while (!error && num_qd == max_qd);
1159
1160         kfree(qda);
1161
1162         return error;
1163 }
1164
1165 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1166 {
1167         return gfs2_quota_sync(sb, type);
1168 }
1169
1170 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1171 {
1172         struct gfs2_quota_data *qd;
1173         struct gfs2_holder q_gh;
1174         int error;
1175
1176         error = qd_get(sdp, user, id, &qd);
1177         if (error)
1178                 return error;
1179
1180         error = do_glock(qd, FORCE, &q_gh);
1181         if (!error)
1182                 gfs2_glock_dq_uninit(&q_gh);
1183
1184         qd_put(qd);
1185         return error;
1186 }
1187
1188 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1189 {
1190         const struct gfs2_quota_change *str = buf;
1191
1192         qc->qc_change = be64_to_cpu(str->qc_change);
1193         qc->qc_flags = be32_to_cpu(str->qc_flags);
1194         qc->qc_id = be32_to_cpu(str->qc_id);
1195 }
1196
1197 int gfs2_quota_init(struct gfs2_sbd *sdp)
1198 {
1199         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1200         u64 size = i_size_read(sdp->sd_qc_inode);
1201         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1202         unsigned int x, slot = 0;
1203         unsigned int found = 0;
1204         u64 dblock;
1205         u32 extlen = 0;
1206         int error;
1207
1208         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
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                 try_to_freeze();
1431
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 |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1459                 /*FALLTHRU*/
1460         case GFS2_QUOTA_ACCOUNT:
1461                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_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, struct kqid qid,
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         int type;
1486
1487         memset(fdq, 0, sizeof(struct fs_disk_quota));
1488
1489         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1490                 return -ESRCH; /* Crazy XFS error code */
1491
1492         if (qid.type == USRQUOTA)
1493                 type = QUOTA_USER;
1494         else if (qid.type == GRPQUOTA)
1495                 type = QUOTA_GROUP;
1496         else
1497                 return -EINVAL;
1498
1499         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1500         if (error)
1501                 return error;
1502         error = do_glock(qd, FORCE, &q_gh);
1503         if (error)
1504                 goto out;
1505
1506         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1507         fdq->d_version = FS_DQUOT_VERSION;
1508         fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1509         fdq->d_id = from_kqid(&init_user_ns, qid);
1510         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1511         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1512         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1513
1514         gfs2_glock_dq_uninit(&q_gh);
1515 out:
1516         qd_put(qd);
1517         return error;
1518 }
1519
1520 /* GFS2 only supports a subset of the XFS fields */
1521 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1522
1523 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1524                           struct fs_disk_quota *fdq)
1525 {
1526         struct gfs2_sbd *sdp = sb->s_fs_info;
1527         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1528         struct gfs2_quota_data *qd;
1529         struct gfs2_holder q_gh, i_gh;
1530         unsigned int data_blocks, ind_blocks;
1531         unsigned int blocks = 0;
1532         int alloc_required;
1533         loff_t offset;
1534         int error;
1535         int type;
1536
1537         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1538                 return -ESRCH; /* Crazy XFS error code */
1539
1540         switch(qid.type) {
1541         case USRQUOTA:
1542                 type = QUOTA_USER;
1543                 if (fdq->d_flags != FS_USER_QUOTA)
1544                         return -EINVAL;
1545                 break;
1546         case GRPQUOTA:
1547                 type = QUOTA_GROUP;
1548                 if (fdq->d_flags != FS_GROUP_QUOTA)
1549                         return -EINVAL;
1550                 break;
1551         default:
1552                 return -EINVAL;
1553         }
1554
1555         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1556                 return -EINVAL;
1557         if (fdq->d_id != from_kqid(&init_user_ns, qid))
1558                 return -EINVAL;
1559
1560         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1561         if (error)
1562                 return error;
1563
1564         error = gfs2_rs_alloc(ip);
1565         if (error)
1566                 goto out_put;
1567
1568         mutex_lock(&ip->i_inode.i_mutex);
1569         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1570         if (error)
1571                 goto out_unlockput;
1572         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1573         if (error)
1574                 goto out_q;
1575
1576         /* Check for existing entry, if none then alloc new blocks */
1577         error = update_qd(sdp, qd);
1578         if (error)
1579                 goto out_i;
1580
1581         /* If nothing has changed, this is a no-op */
1582         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1583             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1584                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1585
1586         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1587             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1588                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1589
1590         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1591             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1592                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1593
1594         if (fdq->d_fieldmask == 0)
1595                 goto out_i;
1596
1597         offset = qd2offset(qd);
1598         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1599         if (gfs2_is_stuffed(ip))
1600                 alloc_required = 1;
1601         if (alloc_required) {
1602                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1603                                        &data_blocks, &ind_blocks);
1604                 blocks = 1 + data_blocks + ind_blocks;
1605                 error = gfs2_inplace_reserve(ip, blocks);
1606                 if (error)
1607                         goto out_i;
1608                 blocks += gfs2_rg_blocks(ip, blocks);
1609         }
1610
1611         /* Some quotas span block boundaries and can update two blocks,
1612            adding an extra block to the transaction to handle such quotas */
1613         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1614         if (error)
1615                 goto out_release;
1616
1617         /* Apply changes */
1618         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1619
1620         gfs2_trans_end(sdp);
1621 out_release:
1622         if (alloc_required)
1623                 gfs2_inplace_release(ip);
1624 out_i:
1625         gfs2_glock_dq_uninit(&i_gh);
1626 out_q:
1627         gfs2_glock_dq_uninit(&q_gh);
1628 out_unlockput:
1629         mutex_unlock(&ip->i_inode.i_mutex);
1630 out_put:
1631         qd_put(qd);
1632         return error;
1633 }
1634
1635 const struct quotactl_ops gfs2_quotactl_ops = {
1636         .quota_sync     = gfs2_quota_sync,
1637         .get_xstate     = gfs2_quota_get_xstate,
1638         .get_dqblk      = gfs2_get_dqblk,
1639         .set_dqblk      = gfs2_set_dqblk,
1640 };