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 struct gfs2_quota_change_host {
  69         u64 qc_change;
  70         u32 qc_flags; /* GFS2_QCF_... */
  71         struct kqid qc_id;
  72 };
  73
  74 static LIST_HEAD(qd_lru_list);
  75 static atomic_t qd_lru_count = ATOMIC_INIT(0);
  76 static DEFINE_SPINLOCK(qd_lru_lock);
  77
  78 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
  79 {
  80         struct gfs2_quota_data *qd;
  81         struct gfs2_sbd *sdp;
  82         int nr_to_scan = sc->nr_to_scan;
  83
  84         if (nr_to_scan == 0)
  85                 goto out;
  86
  87         if (!(sc->gfp_mask & __GFP_FS))
  88                 return -1;
  89
  90         spin_lock(&qd_lru_lock);
  91         while (nr_to_scan && !list_empty(&qd_lru_list)) {
  92                 qd = list_entry(qd_lru_list.next,
  93                                 struct gfs2_quota_data, qd_reclaim);
  94                 sdp = qd->qd_gl->gl_sbd;
  95
  96                 /* Free from the filesystem-specific list */
  97                 list_del(&qd->qd_list);
  98
  99                 gfs2_assert_warn(sdp, !qd->qd_change);
 100                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 101                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 102
 103                 gfs2_glock_put(qd->qd_gl);
 104                 atomic_dec(&sdp->sd_quota_count);
 105
 106                 /* Delete it from the common reclaim list */
 107                 list_del_init(&qd->qd_reclaim);
 108                 atomic_dec(&qd_lru_count);
 109                 spin_unlock(&qd_lru_lock);
 110                 kmem_cache_free(gfs2_quotad_cachep, qd);
 111                 spin_lock(&qd_lru_lock);
 112                 nr_to_scan--;
 113         }
 114         spin_unlock(&qd_lru_lock);
 115
 116 out:
 117         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 118 }
 119
 120 static u64 qd2index(struct gfs2_quota_data *qd)
 121 {
 122         struct kqid qid = qd->qd_id;
 123         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 124                 (qid.type == USRQUOTA) ? 0 : 1;
 125 }
 126
 127 static u64 qd2offset(struct gfs2_quota_data *qd)
 128 {
 129         u64 offset;
 130
 131         offset = qd2index(qd);
 132         offset *= sizeof(struct gfs2_quota);
 133
 134         return offset;
 135 }
 136
 137 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
 138                     struct gfs2_quota_data **qdp)
 139 {
 140         struct gfs2_quota_data *qd;
 141         int error;
 142
 143         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 144         if (!qd)
 145                 return -ENOMEM;
 146
 147         atomic_set(&qd->qd_count, 1);
 148         qd->qd_id = qid;
 149         qd->qd_slot = -1;
 150         INIT_LIST_HEAD(&qd->qd_reclaim);
 151
 152         error = gfs2_glock_get(sdp, qd2index(qd),
 153                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 154         if (error)
 155                 goto fail;
 156
 157         *qdp = qd;
 158
 159         return 0;
 160
 161 fail:
 162         kmem_cache_free(gfs2_quotad_cachep, qd);
 163         return error;
 164 }
 165
 166 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 167                   struct gfs2_quota_data **qdp)
 168 {
 169         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 170         int error, found;
 171
 172         *qdp = NULL;
 173
 174         for (;;) {
 175                 found = 0;
 176                 spin_lock(&qd_lru_lock);
 177                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 178                         if (qid_eq(qd->qd_id, qid)) {
 179                                 if (!atomic_read(&qd->qd_count) &&
 180                                     !list_empty(&qd->qd_reclaim)) {
 181                                         /* Remove it from reclaim list */
 182                                         list_del_init(&qd->qd_reclaim);
 183                                         atomic_dec(&qd_lru_count);
 184                                 }
 185                                 atomic_inc(&qd->qd_count);
 186                                 found = 1;
 187                                 break;
 188                         }
 189                 }
 190
 191                 if (!found)
 192                         qd = NULL;
 193
 194                 if (!qd && new_qd) {
 195                         qd = new_qd;
 196                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 197                         atomic_inc(&sdp->sd_quota_count);
 198                         new_qd = NULL;
 199                 }
 200
 201                 spin_unlock(&qd_lru_lock);
 202
 203                 if (qd) {
 204                         if (new_qd) {
 205                                 gfs2_glock_put(new_qd->qd_gl);
 206                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 207                         }
 208                         *qdp = qd;
 209                         return 0;
 210                 }
 211
 212                 error = qd_alloc(sdp, qid, &new_qd);
 213                 if (error)
 214                         return error;
 215         }
 216 }
 217
 218 static void qd_hold(struct gfs2_quota_data *qd)
 219 {
 220         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 221         gfs2_assert(sdp, atomic_read(&qd->qd_count));
 222         atomic_inc(&qd->qd_count);
 223 }
 224
 225 static void qd_put(struct gfs2_quota_data *qd)
 226 {
 227         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
 228                 /* Add to the reclaim list */
 229                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 230                 atomic_inc(&qd_lru_count);
 231                 spin_unlock(&qd_lru_lock);
 232         }
 233 }
 234
 235 static int slot_get(struct gfs2_quota_data *qd)
 236 {
 237         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 238         unsigned int c, o = 0, b;
 239         unsigned char byte = 0;
 240
 241         spin_lock(&qd_lru_lock);
 242
 243         if (qd->qd_slot_count++) {
 244                 spin_unlock(&qd_lru_lock);
 245                 return 0;
 246         }
 247
 248         for (c = 0; c < sdp->sd_quota_chunks; c++)
 249                 for (o = 0; o < PAGE_SIZE; o++) {
 250                         byte = sdp->sd_quota_bitmap[c][o];
 251                         if (byte != 0xFF)
 252                                 goto found;
 253                 }
 254
 255         goto fail;
 256
 257 found:
 258         for (b = 0; b < 8; b++)
 259                 if (!(byte & (1 << b)))
 260                         break;
 261         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 262
 263         if (qd->qd_slot >= sdp->sd_quota_slots)
 264                 goto fail;
 265
 266         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 267
 268         spin_unlock(&qd_lru_lock);
 269
 270         return 0;
 271
 272 fail:
 273         qd->qd_slot_count--;
 274         spin_unlock(&qd_lru_lock);
 275         return -ENOSPC;
 276 }
 277
 278 static void slot_hold(struct gfs2_quota_data *qd)
 279 {
 280         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 281
 282         spin_lock(&qd_lru_lock);
 283         gfs2_assert(sdp, qd->qd_slot_count);
 284         qd->qd_slot_count++;
 285         spin_unlock(&qd_lru_lock);
 286 }
 287
 288 static void slot_put(struct gfs2_quota_data *qd)
 289 {
 290         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 291
 292         spin_lock(&qd_lru_lock);
 293         gfs2_assert(sdp, qd->qd_slot_count);
 294         if (!--qd->qd_slot_count) {
 295                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 296                 qd->qd_slot = -1;
 297         }
 298         spin_unlock(&qd_lru_lock);
 299 }
 300
 301 static int bh_get(struct gfs2_quota_data *qd)
 302 {
 303         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 304         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 305         unsigned int block, offset;
 306         struct buffer_head *bh;
 307         int error;
 308         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 309
 310         mutex_lock(&sdp->sd_quota_mutex);
 311
 312         if (qd->qd_bh_count++) {
 313                 mutex_unlock(&sdp->sd_quota_mutex);
 314                 return 0;
 315         }
 316
 317         block = qd->qd_slot / sdp->sd_qc_per_block;
 318         offset = qd->qd_slot % sdp->sd_qc_per_block;
 319
 320         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 321         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 322         if (error)
 323                 goto fail;
 324         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 325         if (error)
 326                 goto fail;
 327         error = -EIO;
 328         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 329                 goto fail_brelse;
 330
 331         qd->qd_bh = bh;
 332         qd->qd_bh_qc = (struct gfs2_quota_change *)
 333                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 334                  offset * sizeof(struct gfs2_quota_change));
 335
 336         mutex_unlock(&sdp->sd_quota_mutex);
 337
 338         return 0;
 339
 340 fail_brelse:
 341         brelse(bh);
 342 fail:
 343         qd->qd_bh_count--;
 344         mutex_unlock(&sdp->sd_quota_mutex);
 345         return error;
 346 }
 347
 348 static void bh_put(struct gfs2_quota_data *qd)
 349 {
 350         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 351
 352         mutex_lock(&sdp->sd_quota_mutex);
 353         gfs2_assert(sdp, qd->qd_bh_count);
 354         if (!--qd->qd_bh_count) {
 355                 brelse(qd->qd_bh);
 356                 qd->qd_bh = NULL;
 357                 qd->qd_bh_qc = NULL;
 358         }
 359         mutex_unlock(&sdp->sd_quota_mutex);
 360 }
 361
 362 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 363 {
 364         struct gfs2_quota_data *qd = NULL;
 365         int error;
 366         int found = 0;
 367
 368         *qdp = NULL;
 369
 370         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 371                 return 0;
 372
 373         spin_lock(&qd_lru_lock);
 374
 375         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 376                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 377                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 378                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 379                         continue;
 380
 381                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 382
 383                 set_bit(QDF_LOCKED, &qd->qd_flags);
 384                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 385                 atomic_inc(&qd->qd_count);
 386                 qd->qd_change_sync = qd->qd_change;
 387                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 388                 qd->qd_slot_count++;
 389                 found = 1;
 390
 391                 break;
 392         }
 393
 394         if (!found)
 395                 qd = NULL;
 396
 397         spin_unlock(&qd_lru_lock);
 398
 399         if (qd) {
 400                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 401                 error = bh_get(qd);
 402                 if (error) {
 403                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 404                         slot_put(qd);
 405                         qd_put(qd);
 406                         return error;
 407                 }
 408         }
 409
 410         *qdp = qd;
 411
 412         return 0;
 413 }
 414
 415 static int qd_trylock(struct gfs2_quota_data *qd)
 416 {
 417         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 418
 419         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 420                 return 0;
 421
 422         spin_lock(&qd_lru_lock);
 423
 424         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 425             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 426                 spin_unlock(&qd_lru_lock);
 427                 return 0;
 428         }
 429
 430         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 431
 432         set_bit(QDF_LOCKED, &qd->qd_flags);
 433         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 434         atomic_inc(&qd->qd_count);
 435         qd->qd_change_sync = qd->qd_change;
 436         gfs2_assert_warn(sdp, qd->qd_slot_count);
 437         qd->qd_slot_count++;
 438
 439         spin_unlock(&qd_lru_lock);
 440
 441         gfs2_assert_warn(sdp, qd->qd_change_sync);
 442         if (bh_get(qd)) {
 443                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 444                 slot_put(qd);
 445                 qd_put(qd);
 446                 return 0;
 447         }
 448
 449         return 1;
 450 }
 451
 452 static void qd_unlock(struct gfs2_quota_data *qd)
 453 {
 454         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 455                          test_bit(QDF_LOCKED, &qd->qd_flags));
 456         clear_bit(QDF_LOCKED, &qd->qd_flags);
 457         bh_put(qd);
 458         slot_put(qd);
 459         qd_put(qd);
 460 }
 461
 462 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 463                     struct gfs2_quota_data **qdp)
 464 {
 465         int error;
 466
 467         error = qd_get(sdp, qid, qdp);
 468         if (error)
 469                 return error;
 470
 471         error = slot_get(*qdp);
 472         if (error)
 473                 goto fail;
 474
 475         error = bh_get(*qdp);
 476         if (error)
 477                 goto fail_slot;
 478
 479         return 0;
 480
 481 fail_slot:
 482         slot_put(*qdp);
 483 fail:
 484         qd_put(*qdp);
 485         return error;
 486 }
 487
 488 static void qdsb_put(struct gfs2_quota_data *qd)
 489 {
 490         bh_put(qd);
 491         slot_put(qd);
 492         qd_put(qd);
 493 }
 494
 495 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 496 {
 497         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 498         struct gfs2_quota_data **qd;
 499         int error;
 500
 501         if (ip->i_res == NULL) {
 502                 error = gfs2_rs_alloc(ip);
 503                 if (error)
 504                         return error;
 505         }
 506
 507         qd = ip->i_res->rs_qa_qd;
 508
 509         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 510             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 511                 return -EIO;
 512
 513         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 514                 return 0;
 515
 516         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 517         if (error)
 518                 goto out;
 519         ip->i_res->rs_qa_qd_num++;
 520         qd++;
 521
 522         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 523         if (error)
 524                 goto out;
 525         ip->i_res->rs_qa_qd_num++;
 526         qd++;
 527
 528         if (uid != NO_UID_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 529                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 530                 if (error)
 531                         goto out;
 532                 ip->i_res->rs_qa_qd_num++;
 533                 qd++;
 534         }
 535
 536         if (gid != NO_GID_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 537                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 538                 if (error)
 539                         goto out;
 540                 ip->i_res->rs_qa_qd_num++;
 541                 qd++;
 542         }
 543
 544 out:
 545         if (error)
 546                 gfs2_quota_unhold(ip);
 547         return error;
 548 }
 549
 550 void gfs2_quota_unhold(struct gfs2_inode *ip)
 551 {
 552         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 553         unsigned int x;
 554
 555         if (ip->i_res == NULL)
 556                 return;
 557         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 558
 559         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 560                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 561                 ip->i_res->rs_qa_qd[x] = NULL;
 562         }
 563         ip->i_res->rs_qa_qd_num = 0;
 564 }
 565
 566 static int sort_qd(const void *a, const void *b)
 567 {
 568         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 569         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 570
 571         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 572                 return -1;
 573         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 574                 return 1;
 575         return 0;
 576 }
 577
 578 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 579 {
 580         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 581         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 582         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 583         s64 x;
 584
 585         mutex_lock(&sdp->sd_quota_mutex);
 586         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 587
 588         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 589                 qc->qc_change = 0;
 590                 qc->qc_flags = 0;
 591                 if (qd->qd_id.type == USRQUOTA)
 592                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 593                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 594         }
 595
 596         x = be64_to_cpu(qc->qc_change) + change;
 597         qc->qc_change = cpu_to_be64(x);
 598
 599         spin_lock(&qd_lru_lock);
 600         qd->qd_change = x;
 601         spin_unlock(&qd_lru_lock);
 602
 603         if (!x) {
 604                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 605                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 606                 qc->qc_flags = 0;
 607                 qc->qc_id = 0;
 608                 slot_put(qd);
 609                 qd_put(qd);
 610         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 611                 qd_hold(qd);
 612                 slot_hold(qd);
 613         }
 614
 615         mutex_unlock(&sdp->sd_quota_mutex);
 616 }
 617
 618 /**
 619  * gfs2_adjust_quota - adjust record of current block usage
 620  * @ip: The quota inode
 621  * @loc: Offset of the entry in the quota file
 622  * @change: The amount of usage change to record
 623  * @qd: The quota data
 624  * @fdq: The updated limits to record
 625  *
 626  * This function was mostly borrowed from gfs2_block_truncate_page which was
 627  * in turn mostly borrowed from ext3
 628  *
 629  * Returns: 0 or -ve on error
 630  */
 631
 632 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 633                              s64 change, struct gfs2_quota_data *qd,
 634                              struct fs_disk_quota *fdq)
 635 {
 636         struct inode *inode = &ip->i_inode;
 637         struct gfs2_sbd *sdp = GFS2_SB(inode);
 638         struct address_space *mapping = inode->i_mapping;
 639         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 640         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 641         unsigned blocksize, iblock, pos;
 642         struct buffer_head *bh;
 643         struct page *page;
 644         void *kaddr, *ptr;
 645         struct gfs2_quota q, *qp;
 646         int err, nbytes;
 647         u64 size;
 648
 649         if (gfs2_is_stuffed(ip)) {
 650                 err = gfs2_unstuff_dinode(ip, NULL);
 651                 if (err)
 652                         return err;
 653         }
 654
 655         memset(&q, 0, sizeof(struct gfs2_quota));
 656         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 657         if (err < 0)
 658                 return err;
 659
 660         err = -EIO;
 661         qp = &q;
 662         qp->qu_value = be64_to_cpu(qp->qu_value);
 663         qp->qu_value += change;
 664         qp->qu_value = cpu_to_be64(qp->qu_value);
 665         qd->qd_qb.qb_value = qp->qu_value;
 666         if (fdq) {
 667                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 668                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 669                         qd->qd_qb.qb_warn = qp->qu_warn;
 670                 }
 671                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 672                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 673                         qd->qd_qb.qb_limit = qp->qu_limit;
 674                 }
 675                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 676                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 677                         qd->qd_qb.qb_value = qp->qu_value;
 678                 }
 679         }
 680
 681         /* Write the quota into the quota file on disk */
 682         ptr = qp;
 683         nbytes = sizeof(struct gfs2_quota);
 684 get_a_page:
 685         page = find_or_create_page(mapping, index, GFP_NOFS);
 686         if (!page)
 687                 return -ENOMEM;
 688
 689         blocksize = inode->i_sb->s_blocksize;
 690         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 691
 692         if (!page_has_buffers(page))
 693                 create_empty_buffers(page, blocksize, 0);
 694
 695         bh = page_buffers(page);
 696         pos = blocksize;
 697         while (offset >= pos) {
 698                 bh = bh->b_this_page;
 699                 iblock++;
 700                 pos += blocksize;
 701         }
 702
 703         if (!buffer_mapped(bh)) {
 704                 gfs2_block_map(inode, iblock, bh, 1);
 705                 if (!buffer_mapped(bh))
 706                         goto unlock_out;
 707                 /* If it's a newly allocated disk block for quota, zero it */
 708                 if (buffer_new(bh))
 709                         zero_user(page, pos - blocksize, bh->b_size);
 710         }
 711
 712         if (PageUptodate(page))
 713                 set_buffer_uptodate(bh);
 714
 715         if (!buffer_uptodate(bh)) {
 716                 ll_rw_block(READ | REQ_META, 1, &bh);
 717                 wait_on_buffer(bh);
 718                 if (!buffer_uptodate(bh))
 719                         goto unlock_out;
 720         }
 721
 722         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 723
 724         kaddr = kmap_atomic(page);
 725         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 726                 nbytes = PAGE_CACHE_SIZE - offset;
 727         memcpy(kaddr + offset, ptr, nbytes);
 728         flush_dcache_page(page);
 729         kunmap_atomic(kaddr);
 730         unlock_page(page);
 731         page_cache_release(page);
 732
 733         /* If quota straddles page boundary, we need to update the rest of the
 734          * quota at the beginning of the next page */
 735         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 736                 ptr = ptr + nbytes;
 737                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 738                 offset = 0;
 739                 index++;
 740                 goto get_a_page;
 741         }
 742
 743         size = loc + sizeof(struct gfs2_quota);
 744         if (size > inode->i_size)
 745                 i_size_write(inode, size);
 746         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 747         mark_inode_dirty(inode);
 748         return 0;
 749
 750 unlock_out:
 751         unlock_page(page);
 752         page_cache_release(page);
 753         return err;
 754 }
 755
 756 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 757 {
 758         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 759         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 760         unsigned int data_blocks, ind_blocks;
 761         struct gfs2_holder *ghs, i_gh;
 762         unsigned int qx, x;
 763         struct gfs2_quota_data *qd;
 764         unsigned reserved;
 765         loff_t offset;
 766         unsigned int nalloc = 0, blocks;
 767         int error;
 768
 769         error = gfs2_rs_alloc(ip);
 770         if (error)
 771                 return error;
 772
 773         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 774                               &data_blocks, &ind_blocks);
 775
 776         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 777         if (!ghs)
 778                 return -ENOMEM;
 779
 780         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 781         mutex_lock(&ip->i_inode.i_mutex);
 782         for (qx = 0; qx < num_qd; qx++) {
 783                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 784                                            GL_NOCACHE, &ghs[qx]);
 785                 if (error)
 786                         goto out;
 787         }
 788
 789         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 790         if (error)
 791                 goto out;
 792
 793         for (x = 0; x < num_qd; x++) {
 794                 offset = qd2offset(qda[x]);
 795                 if (gfs2_write_alloc_required(ip, offset,
 796                                               sizeof(struct gfs2_quota)))
 797                         nalloc++;
 798         }
 799
 800         /*
 801          * 1 blk for unstuffing inode if stuffed. We add this extra
 802          * block to the reservation unconditionally. If the inode
 803          * doesn't need unstuffing, the block will be released to the
 804          * rgrp since it won't be allocated during the transaction
 805          */
 806         /* +3 in the end for unstuffing block, inode size update block
 807          * and another block in case quota straddles page boundary and
 808          * two blocks need to be updated instead of 1 */
 809         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 810
 811         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 812         error = gfs2_inplace_reserve(ip, reserved, 0);
 813         if (error)
 814                 goto out_alloc;
 815
 816         if (nalloc)
 817                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 818
 819         error = gfs2_trans_begin(sdp, blocks, 0);
 820         if (error)
 821                 goto out_ipres;
 822
 823         for (x = 0; x < num_qd; x++) {
 824                 qd = qda[x];
 825                 offset = qd2offset(qd);
 826                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 827                 if (error)
 828                         goto out_end_trans;
 829
 830                 do_qc(qd, -qd->qd_change_sync);
 831                 set_bit(QDF_REFRESH, &qd->qd_flags);
 832         }
 833
 834         error = 0;
 835
 836 out_end_trans:
 837         gfs2_trans_end(sdp);
 838 out_ipres:
 839         gfs2_inplace_release(ip);
 840 out_alloc:
 841         gfs2_glock_dq_uninit(&i_gh);
 842 out:
 843         while (qx--)
 844                 gfs2_glock_dq_uninit(&ghs[qx]);
 845         mutex_unlock(&ip->i_inode.i_mutex);
 846         kfree(ghs);
 847         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 848         return error;
 849 }
 850
 851 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 852 {
 853         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 854         struct gfs2_quota q;
 855         struct gfs2_quota_lvb *qlvb;
 856         loff_t pos;
 857         int error;
 858
 859         memset(&q, 0, sizeof(struct gfs2_quota));
 860         pos = qd2offset(qd);
 861         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 862         if (error < 0)
 863                 return error;
 864
 865         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 866         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 867         qlvb->__pad = 0;
 868         qlvb->qb_limit = q.qu_limit;
 869         qlvb->qb_warn = q.qu_warn;
 870         qlvb->qb_value = q.qu_value;
 871         qd->qd_qb = *qlvb;
 872
 873         return 0;
 874 }
 875
 876 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 877                     struct gfs2_holder *q_gh)
 878 {
 879         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 880         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 881         struct gfs2_holder i_gh;
 882         int error;
 883
 884 restart:
 885         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 886         if (error)
 887                 return error;
 888
 889         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 890
 891         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 892                 gfs2_glock_dq_uninit(q_gh);
 893                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 894                                            GL_NOCACHE, q_gh);
 895                 if (error)
 896                         return error;
 897
 898                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 899                 if (error)
 900                         goto fail;
 901
 902                 error = update_qd(sdp, qd);
 903                 if (error)
 904                         goto fail_gunlock;
 905
 906                 gfs2_glock_dq_uninit(&i_gh);
 907                 gfs2_glock_dq_uninit(q_gh);
 908                 force_refresh = 0;
 909                 goto restart;
 910         }
 911
 912         return 0;
 913
 914 fail_gunlock:
 915         gfs2_glock_dq_uninit(&i_gh);
 916 fail:
 917         gfs2_glock_dq_uninit(q_gh);
 918         return error;
 919 }
 920
 921 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 922 {
 923         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 924         struct gfs2_quota_data *qd;
 925         unsigned int x;
 926         int error = 0;
 927
 928         error = gfs2_quota_hold(ip, uid, gid);
 929         if (error)
 930                 return error;
 931
 932         if (capable(CAP_SYS_RESOURCE) ||
 933             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 934                 return 0;
 935
 936         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 937              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 938
 939         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 940                 int force = NO_FORCE;
 941                 qd = ip->i_res->rs_qa_qd[x];
 942                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 943                         force = FORCE;
 944                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 945                 if (error)
 946                         break;
 947         }
 948
 949         if (!error)
 950                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 951         else {
 952                 while (x--)
 953                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 954                 gfs2_quota_unhold(ip);
 955         }
 956
 957         return error;
 958 }
 959
 960 static int need_sync(struct gfs2_quota_data *qd)
 961 {
 962         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 963         struct gfs2_tune *gt = &sdp->sd_tune;
 964         s64 value;
 965         unsigned int num, den;
 966         int do_sync = 1;
 967
 968         if (!qd->qd_qb.qb_limit)
 969                 return 0;
 970
 971         spin_lock(&qd_lru_lock);
 972         value = qd->qd_change;
 973         spin_unlock(&qd_lru_lock);
 974
 975         spin_lock(&gt->gt_spin);
 976         num = gt->gt_quota_scale_num;
 977         den = gt->gt_quota_scale_den;
 978         spin_unlock(&gt->gt_spin);
 979
 980         if (value < 0)
 981                 do_sync = 0;
 982         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 983                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 984                 do_sync = 0;
 985         else {
 986                 value *= gfs2_jindex_size(sdp) * num;
 987                 value = div_s64(value, den);
 988                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 989                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 990                         do_sync = 0;
 991         }
 992
 993         return do_sync;
 994 }
 995
 996 void gfs2_quota_unlock(struct gfs2_inode *ip)
 997 {
 998         struct gfs2_quota_data *qda[4];
 999         unsigned int count = 0;
1000         unsigned int x;
1001
1002         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1003                 goto out;
1004
1005         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1006                 struct gfs2_quota_data *qd;
1007                 int sync;
1008
1009                 qd = ip->i_res->rs_qa_qd[x];
1010                 sync = need_sync(qd);
1011
1012                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1013
1014                 if (sync && qd_trylock(qd))
1015                         qda[count++] = qd;
1016         }
1017
1018         if (count) {
1019                 do_sync(count, qda);
1020                 for (x = 0; x < count; x++)
1021                         qd_unlock(qda[x]);
1022         }
1023
1024 out:
1025         gfs2_quota_unhold(ip);
1026 }
1027
1028 #define MAX_LINE 256
1029
1030 static int print_message(struct gfs2_quota_data *qd, char *type)
1031 {
1032         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1033
1034         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1035                sdp->sd_fsname, type,
1036                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1037                from_kqid(&init_user_ns, qd->qd_id));
1038
1039         return 0;
1040 }
1041
1042 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1043 {
1044         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1045         struct gfs2_quota_data *qd;
1046         s64 value;
1047         unsigned int x;
1048         int error = 0;
1049
1050         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1051                 return 0;
1052
1053         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1054                 return 0;
1055
1056         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1057                 qd = ip->i_res->rs_qa_qd[x];
1058
1059                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1060                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1061                         continue;
1062
1063                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1064                 spin_lock(&qd_lru_lock);
1065                 value += qd->qd_change;
1066                 spin_unlock(&qd_lru_lock);
1067
1068                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1069                         print_message(qd, "exceeded");
1070                         quota_send_warning(qd->qd_id,
1071                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1072
1073                         error = -EDQUOT;
1074                         break;
1075                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1076                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1077                            time_after_eq(jiffies, qd->qd_last_warn +
1078                                          gfs2_tune_get(sdp,
1079                                                 gt_quota_warn_period) * HZ)) {
1080                         quota_send_warning(qd->qd_id,
1081                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1082                         error = print_message(qd, "warning");
1083                         qd->qd_last_warn = jiffies;
1084                 }
1085         }
1086
1087         return error;
1088 }
1089
1090 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1091                        kuid_t uid, kgid_t gid)
1092 {
1093         struct gfs2_quota_data *qd;
1094         unsigned int x;
1095
1096         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1097                 return;
1098         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1099                 return;
1100
1101         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1102                 qd = ip->i_res->rs_qa_qd[x];
1103
1104                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1105                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1106                         do_qc(qd, change);
1107                 }
1108         }
1109 }
1110
1111 int gfs2_quota_sync(struct super_block *sb, int type)
1112 {
1113         struct gfs2_sbd *sdp = sb->s_fs_info;
1114         struct gfs2_quota_data **qda;
1115         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1116         unsigned int num_qd;
1117         unsigned int x;
1118         int error = 0;
1119
1120         sdp->sd_quota_sync_gen++;
1121
1122         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1123         if (!qda)
1124                 return -ENOMEM;
1125
1126         do {
1127                 num_qd = 0;
1128
1129                 for (;;) {
1130                         error = qd_fish(sdp, qda + num_qd);
1131                         if (error || !qda[num_qd])
1132                                 break;
1133                         if (++num_qd == max_qd)
1134                                 break;
1135                 }
1136
1137                 if (num_qd) {
1138                         if (!error)
1139                                 error = do_sync(num_qd, qda);
1140                         if (!error)
1141                                 for (x = 0; x < num_qd; x++)
1142                                         qda[x]->qd_sync_gen =
1143                                                 sdp->sd_quota_sync_gen;
1144
1145                         for (x = 0; x < num_qd; x++)
1146                                 qd_unlock(qda[x]);
1147                 }
1148         } while (!error && num_qd == max_qd);
1149
1150         kfree(qda);
1151
1152         return error;
1153 }
1154
1155 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1156 {
1157         return gfs2_quota_sync(sb, type);
1158 }
1159
1160 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1161 {
1162         struct gfs2_quota_data *qd;
1163         struct gfs2_holder q_gh;
1164         int error;
1165
1166         error = qd_get(sdp, qid, &qd);
1167         if (error)
1168                 return error;
1169
1170         error = do_glock(qd, FORCE, &q_gh);
1171         if (!error)
1172                 gfs2_glock_dq_uninit(&q_gh);
1173
1174         qd_put(qd);
1175         return error;
1176 }
1177
1178 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1179 {
1180         const struct gfs2_quota_change *str = buf;
1181
1182         qc->qc_change = be64_to_cpu(str->qc_change);
1183         qc->qc_flags = be32_to_cpu(str->qc_flags);
1184         qc->qc_id = make_kqid(&init_user_ns,
1185                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1186                               be32_to_cpu(str->qc_id));
1187 }
1188
1189 int gfs2_quota_init(struct gfs2_sbd *sdp)
1190 {
1191         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1192         u64 size = i_size_read(sdp->sd_qc_inode);
1193         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1194         unsigned int x, slot = 0;
1195         unsigned int found = 0;
1196         u64 dblock;
1197         u32 extlen = 0;
1198         int error;
1199
1200         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1201                 return -EIO;
1202
1203         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1204         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1205
1206         error = -ENOMEM;
1207
1208         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1209                                        sizeof(unsigned char *), GFP_NOFS);
1210         if (!sdp->sd_quota_bitmap)
1211                 return error;
1212
1213         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1214                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1215                 if (!sdp->sd_quota_bitmap[x])
1216                         goto fail;
1217         }
1218
1219         for (x = 0; x < blocks; x++) {
1220                 struct buffer_head *bh;
1221                 unsigned int y;
1222
1223                 if (!extlen) {
1224                         int new = 0;
1225                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1226                         if (error)
1227                                 goto fail;
1228                 }
1229                 error = -EIO;
1230                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1231                 if (!bh)
1232                         goto fail;
1233                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1234                         brelse(bh);
1235                         goto fail;
1236                 }
1237
1238                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1239                      y++, slot++) {
1240                         struct gfs2_quota_change_host qc;
1241                         struct gfs2_quota_data *qd;
1242
1243                         gfs2_quota_change_in(&qc, bh->b_data +
1244                                           sizeof(struct gfs2_meta_header) +
1245                                           y * sizeof(struct gfs2_quota_change));
1246                         if (!qc.qc_change)
1247                                 continue;
1248
1249                         error = qd_alloc(sdp, qc.qc_id, &qd);
1250                         if (error) {
1251                                 brelse(bh);
1252                                 goto fail;
1253                         }
1254
1255                         set_bit(QDF_CHANGE, &qd->qd_flags);
1256                         qd->qd_change = qc.qc_change;
1257                         qd->qd_slot = slot;
1258                         qd->qd_slot_count = 1;
1259
1260                         spin_lock(&qd_lru_lock);
1261                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1262                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1263                         atomic_inc(&sdp->sd_quota_count);
1264                         spin_unlock(&qd_lru_lock);
1265
1266                         found++;
1267                 }
1268
1269                 brelse(bh);
1270                 dblock++;
1271                 extlen--;
1272         }
1273
1274         if (found)
1275                 fs_info(sdp, "found %u quota changes\n", found);
1276
1277         return 0;
1278
1279 fail:
1280         gfs2_quota_cleanup(sdp);
1281         return error;
1282 }
1283
1284 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1285 {
1286         struct list_head *head = &sdp->sd_quota_list;
1287         struct gfs2_quota_data *qd;
1288         unsigned int x;
1289
1290         spin_lock(&qd_lru_lock);
1291         while (!list_empty(head)) {
1292                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1293
1294                 if (atomic_read(&qd->qd_count) > 1 ||
1295                     (atomic_read(&qd->qd_count) &&
1296                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1297                         list_move(&qd->qd_list, head);
1298                         spin_unlock(&qd_lru_lock);
1299                         schedule();
1300                         spin_lock(&qd_lru_lock);
1301                         continue;
1302                 }
1303
1304                 list_del(&qd->qd_list);
1305                 /* Also remove if this qd exists in the reclaim list */
1306                 if (!list_empty(&qd->qd_reclaim)) {
1307                         list_del_init(&qd->qd_reclaim);
1308                         atomic_dec(&qd_lru_count);
1309                 }
1310                 atomic_dec(&sdp->sd_quota_count);
1311                 spin_unlock(&qd_lru_lock);
1312
1313                 if (!atomic_read(&qd->qd_count)) {
1314                         gfs2_assert_warn(sdp, !qd->qd_change);
1315                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1316                 } else
1317                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1318                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1319
1320                 gfs2_glock_put(qd->qd_gl);
1321                 kmem_cache_free(gfs2_quotad_cachep, qd);
1322
1323                 spin_lock(&qd_lru_lock);
1324         }
1325         spin_unlock(&qd_lru_lock);
1326
1327         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1328
1329         if (sdp->sd_quota_bitmap) {
1330                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1331                         kfree(sdp->sd_quota_bitmap[x]);
1332                 kfree(sdp->sd_quota_bitmap);
1333         }
1334 }
1335
1336 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1337 {
1338         if (error == 0 || error == -EROFS)
1339                 return;
1340         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1341                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1342 }
1343
1344 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1345                                int (*fxn)(struct super_block *sb, int type),
1346                                unsigned long t, unsigned long *timeo,
1347                                unsigned int *new_timeo)
1348 {
1349         if (t >= *timeo) {
1350                 int error = fxn(sdp->sd_vfs, 0);
1351                 quotad_error(sdp, msg, error);
1352                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1353         } else {
1354                 *timeo -= t;
1355         }
1356 }
1357
1358 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1359 {
1360         struct gfs2_inode *ip;
1361
1362         while(1) {
1363                 ip = NULL;
1364                 spin_lock(&sdp->sd_trunc_lock);
1365                 if (!list_empty(&sdp->sd_trunc_list)) {
1366                         ip = list_entry(sdp->sd_trunc_list.next,
1367                                         struct gfs2_inode, i_trunc_list);
1368                         list_del_init(&ip->i_trunc_list);
1369                 }
1370                 spin_unlock(&sdp->sd_trunc_lock);
1371                 if (ip == NULL)
1372                         return;
1373                 gfs2_glock_finish_truncate(ip);
1374         }
1375 }
1376
1377 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1378         if (!sdp->sd_statfs_force_sync) {
1379                 sdp->sd_statfs_force_sync = 1;
1380                 wake_up(&sdp->sd_quota_wait);
1381         }
1382 }
1383
1384
1385 /**
1386  * gfs2_quotad - Write cached quota changes into the quota file
1387  * @sdp: Pointer to GFS2 superblock
1388  *
1389  */
1390
1391 int gfs2_quotad(void *data)
1392 {
1393         struct gfs2_sbd *sdp = data;
1394         struct gfs2_tune *tune = &sdp->sd_tune;
1395         unsigned long statfs_timeo = 0;
1396         unsigned long quotad_timeo = 0;
1397         unsigned long t = 0;
1398         DEFINE_WAIT(wait);
1399         int empty;
1400
1401         while (!kthread_should_stop()) {
1402
1403                 /* Update the master statfs file */
1404                 if (sdp->sd_statfs_force_sync) {
1405                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1406                         quotad_error(sdp, "statfs", error);
1407                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1408                 }
1409                 else
1410                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1411                                            &statfs_timeo,
1412                                            &tune->gt_statfs_quantum);
1413
1414                 /* Update quota file */
1415                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1416                                    &quotad_timeo, &tune->gt_quota_quantum);
1417
1418                 /* Check for & recover partially truncated inodes */
1419                 quotad_check_trunc_list(sdp);
1420
1421                 try_to_freeze();
1422
1423                 t = min(quotad_timeo, statfs_timeo);
1424
1425                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1426                 spin_lock(&sdp->sd_trunc_lock);
1427                 empty = list_empty(&sdp->sd_trunc_list);
1428                 spin_unlock(&sdp->sd_trunc_lock);
1429                 if (empty && !sdp->sd_statfs_force_sync)
1430                         t -= schedule_timeout(t);
1431                 else
1432                         t = 0;
1433                 finish_wait(&sdp->sd_quota_wait, &wait);
1434         }
1435
1436         return 0;
1437 }
1438
1439 static int gfs2_quota_get_xstate(struct super_block *sb,
1440                                  struct fs_quota_stat *fqs)
1441 {
1442         struct gfs2_sbd *sdp = sb->s_fs_info;
1443
1444         memset(fqs, 0, sizeof(struct fs_quota_stat));
1445         fqs->qs_version = FS_QSTAT_VERSION;
1446
1447         switch (sdp->sd_args.ar_quota) {
1448         case GFS2_QUOTA_ON:
1449                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1450                 /*FALLTHRU*/
1451         case GFS2_QUOTA_ACCOUNT:
1452                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1453                 break;
1454         case GFS2_QUOTA_OFF:
1455                 break;
1456         }
1457
1458         if (sdp->sd_quota_inode) {
1459                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1460                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1461         }
1462         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1463         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1464         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1465         return 0;
1466 }
1467
1468 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1469                           struct fs_disk_quota *fdq)
1470 {
1471         struct gfs2_sbd *sdp = sb->s_fs_info;
1472         struct gfs2_quota_lvb *qlvb;
1473         struct gfs2_quota_data *qd;
1474         struct gfs2_holder q_gh;
1475         int error;
1476
1477         memset(fdq, 0, sizeof(struct fs_disk_quota));
1478
1479         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1480                 return -ESRCH; /* Crazy XFS error code */
1481
1482         if ((qid.type != USRQUOTA) &&
1483             (qid.type != GRPQUOTA))
1484                 return -EINVAL;
1485
1486         error = qd_get(sdp, qid, &qd);
1487         if (error)
1488                 return error;
1489         error = do_glock(qd, FORCE, &q_gh);
1490         if (error)
1491                 goto out;
1492
1493         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1494         fdq->d_version = FS_DQUOT_VERSION;
1495         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1496         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1497         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1498         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1499         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1500
1501         gfs2_glock_dq_uninit(&q_gh);
1502 out:
1503         qd_put(qd);
1504         return error;
1505 }
1506
1507 /* GFS2 only supports a subset of the XFS fields */
1508 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1509
1510 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1511                           struct fs_disk_quota *fdq)
1512 {
1513         struct gfs2_sbd *sdp = sb->s_fs_info;
1514         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1515         struct gfs2_quota_data *qd;
1516         struct gfs2_holder q_gh, i_gh;
1517         unsigned int data_blocks, ind_blocks;
1518         unsigned int blocks = 0;
1519         int alloc_required;
1520         loff_t offset;
1521         int error;
1522
1523         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1524                 return -ESRCH; /* Crazy XFS error code */
1525
1526         if ((qid.type != USRQUOTA) &&
1527             (qid.type != GRPQUOTA))
1528                 return -EINVAL;
1529
1530         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1531                 return -EINVAL;
1532
1533         error = qd_get(sdp, qid, &qd);
1534         if (error)
1535                 return error;
1536
1537         error = gfs2_rs_alloc(ip);
1538         if (error)
1539                 goto out_put;
1540
1541         mutex_lock(&ip->i_inode.i_mutex);
1542         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1543         if (error)
1544                 goto out_unlockput;
1545         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1546         if (error)
1547                 goto out_q;
1548
1549         /* Check for existing entry, if none then alloc new blocks */
1550         error = update_qd(sdp, qd);
1551         if (error)
1552                 goto out_i;
1553
1554         /* If nothing has changed, this is a no-op */
1555         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1556             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1557                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1558
1559         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1560             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1561                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1562
1563         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1564             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1565                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1566
1567         if (fdq->d_fieldmask == 0)
1568                 goto out_i;
1569
1570         offset = qd2offset(qd);
1571         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1572         if (gfs2_is_stuffed(ip))
1573                 alloc_required = 1;
1574         if (alloc_required) {
1575                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1576                                        &data_blocks, &ind_blocks);
1577                 blocks = 1 + data_blocks + ind_blocks;
1578                 error = gfs2_inplace_reserve(ip, blocks, 0);
1579                 if (error)
1580                         goto out_i;
1581                 blocks += gfs2_rg_blocks(ip, blocks);
1582         }
1583
1584         /* Some quotas span block boundaries and can update two blocks,
1585            adding an extra block to the transaction to handle such quotas */
1586         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1587         if (error)
1588                 goto out_release;
1589
1590         /* Apply changes */
1591         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1592
1593         gfs2_trans_end(sdp);
1594 out_release:
1595         if (alloc_required)
1596                 gfs2_inplace_release(ip);
1597 out_i:
1598         gfs2_glock_dq_uninit(&i_gh);
1599 out_q:
1600         gfs2_glock_dq_uninit(&q_gh);
1601 out_unlockput:
1602         mutex_unlock(&ip->i_inode.i_mutex);
1603 out_put:
1604         qd_put(qd);
1605         return error;
1606 }
1607
1608 const struct quotactl_ops gfs2_quotactl_ops = {
1609         .quota_sync     = gfs2_quota_sync,
1610         .get_xstate     = gfs2_quota_get_xstate,
1611         .get_dqblk      = gfs2_get_dqblk,
1612         .set_dqblk      = gfs2_set_dqblk,
1613 };