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_eq(uid, NO_UID_QUOTA_CHANGE) &&
 529             !uid_eq(uid, ip->i_inode.i_uid)) {
 530                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 531                 if (error)
 532                         goto out;
 533                 ip->i_res->rs_qa_qd_num++;
 534                 qd++;
 535         }
 536
 537         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 538             !gid_eq(gid, ip->i_inode.i_gid)) {
 539                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 540                 if (error)
 541                         goto out;
 542                 ip->i_res->rs_qa_qd_num++;
 543                 qd++;
 544         }
 545
 546 out:
 547         if (error)
 548                 gfs2_quota_unhold(ip);
 549         return error;
 550 }
 551
 552 void gfs2_quota_unhold(struct gfs2_inode *ip)
 553 {
 554         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 555         unsigned int x;
 556
 557         if (ip->i_res == NULL)
 558                 return;
 559         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 560
 561         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 562                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 563                 ip->i_res->rs_qa_qd[x] = NULL;
 564         }
 565         ip->i_res->rs_qa_qd_num = 0;
 566 }
 567
 568 static int sort_qd(const void *a, const void *b)
 569 {
 570         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 571         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 572
 573         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 574                 return -1;
 575         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 576                 return 1;
 577         return 0;
 578 }
 579
 580 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 581 {
 582         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 583         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 584         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 585         s64 x;
 586
 587         mutex_lock(&sdp->sd_quota_mutex);
 588         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 589
 590         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 591                 qc->qc_change = 0;
 592                 qc->qc_flags = 0;
 593                 if (qd->qd_id.type == USRQUOTA)
 594                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 595                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 596         }
 597
 598         x = be64_to_cpu(qc->qc_change) + change;
 599         qc->qc_change = cpu_to_be64(x);
 600
 601         spin_lock(&qd_lru_lock);
 602         qd->qd_change = x;
 603         spin_unlock(&qd_lru_lock);
 604
 605         if (!x) {
 606                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 607                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 608                 qc->qc_flags = 0;
 609                 qc->qc_id = 0;
 610                 slot_put(qd);
 611                 qd_put(qd);
 612         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 613                 qd_hold(qd);
 614                 slot_hold(qd);
 615         }
 616
 617         mutex_unlock(&sdp->sd_quota_mutex);
 618 }
 619
 620 /**
 621  * gfs2_adjust_quota - adjust record of current block usage
 622  * @ip: The quota inode
 623  * @loc: Offset of the entry in the quota file
 624  * @change: The amount of usage change to record
 625  * @qd: The quota data
 626  * @fdq: The updated limits to record
 627  *
 628  * This function was mostly borrowed from gfs2_block_truncate_page which was
 629  * in turn mostly borrowed from ext3
 630  *
 631  * Returns: 0 or -ve on error
 632  */
 633
 634 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 635                              s64 change, struct gfs2_quota_data *qd,
 636                              struct fs_disk_quota *fdq)
 637 {
 638         struct inode *inode = &ip->i_inode;
 639         struct gfs2_sbd *sdp = GFS2_SB(inode);
 640         struct address_space *mapping = inode->i_mapping;
 641         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 642         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 643         unsigned blocksize, iblock, pos;
 644         struct buffer_head *bh;
 645         struct page *page;
 646         void *kaddr, *ptr;
 647         struct gfs2_quota q, *qp;
 648         int err, nbytes;
 649         u64 size;
 650
 651         if (gfs2_is_stuffed(ip)) {
 652                 err = gfs2_unstuff_dinode(ip, NULL);
 653                 if (err)
 654                         return err;
 655         }
 656
 657         memset(&q, 0, sizeof(struct gfs2_quota));
 658         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 659         if (err < 0)
 660                 return err;
 661
 662         err = -EIO;
 663         qp = &q;
 664         qp->qu_value = be64_to_cpu(qp->qu_value);
 665         qp->qu_value += change;
 666         qp->qu_value = cpu_to_be64(qp->qu_value);
 667         qd->qd_qb.qb_value = qp->qu_value;
 668         if (fdq) {
 669                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 670                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 671                         qd->qd_qb.qb_warn = qp->qu_warn;
 672                 }
 673                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 674                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 675                         qd->qd_qb.qb_limit = qp->qu_limit;
 676                 }
 677                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 678                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 679                         qd->qd_qb.qb_value = qp->qu_value;
 680                 }
 681         }
 682
 683         /* Write the quota into the quota file on disk */
 684         ptr = qp;
 685         nbytes = sizeof(struct gfs2_quota);
 686 get_a_page:
 687         page = find_or_create_page(mapping, index, GFP_NOFS);
 688         if (!page)
 689                 return -ENOMEM;
 690
 691         blocksize = inode->i_sb->s_blocksize;
 692         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 693
 694         if (!page_has_buffers(page))
 695                 create_empty_buffers(page, blocksize, 0);
 696
 697         bh = page_buffers(page);
 698         pos = blocksize;
 699         while (offset >= pos) {
 700                 bh = bh->b_this_page;
 701                 iblock++;
 702                 pos += blocksize;
 703         }
 704
 705         if (!buffer_mapped(bh)) {
 706                 gfs2_block_map(inode, iblock, bh, 1);
 707                 if (!buffer_mapped(bh))
 708                         goto unlock_out;
 709                 /* If it's a newly allocated disk block for quota, zero it */
 710                 if (buffer_new(bh))
 711                         zero_user(page, pos - blocksize, bh->b_size);
 712         }
 713
 714         if (PageUptodate(page))
 715                 set_buffer_uptodate(bh);
 716
 717         if (!buffer_uptodate(bh)) {
 718                 ll_rw_block(READ | REQ_META, 1, &bh);
 719                 wait_on_buffer(bh);
 720                 if (!buffer_uptodate(bh))
 721                         goto unlock_out;
 722         }
 723
 724         gfs2_trans_add_data(ip->i_gl, bh);
 725
 726         kaddr = kmap_atomic(page);
 727         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 728                 nbytes = PAGE_CACHE_SIZE - offset;
 729         memcpy(kaddr + offset, ptr, nbytes);
 730         flush_dcache_page(page);
 731         kunmap_atomic(kaddr);
 732         unlock_page(page);
 733         page_cache_release(page);
 734
 735         /* If quota straddles page boundary, we need to update the rest of the
 736          * quota at the beginning of the next page */
 737         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 738                 ptr = ptr + nbytes;
 739                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 740                 offset = 0;
 741                 index++;
 742                 goto get_a_page;
 743         }
 744
 745         size = loc + sizeof(struct gfs2_quota);
 746         if (size > inode->i_size)
 747                 i_size_write(inode, size);
 748         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 749         mark_inode_dirty(inode);
 750         return 0;
 751
 752 unlock_out:
 753         unlock_page(page);
 754         page_cache_release(page);
 755         return err;
 756 }
 757
 758 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 759 {
 760         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 761         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 762         unsigned int data_blocks, ind_blocks;
 763         struct gfs2_holder *ghs, i_gh;
 764         unsigned int qx, x;
 765         struct gfs2_quota_data *qd;
 766         unsigned reserved;
 767         loff_t offset;
 768         unsigned int nalloc = 0, blocks;
 769         int error;
 770
 771         error = gfs2_rs_alloc(ip);
 772         if (error)
 773                 return error;
 774
 775         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 776                               &data_blocks, &ind_blocks);
 777
 778         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 779         if (!ghs)
 780                 return -ENOMEM;
 781
 782         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 783         mutex_lock(&ip->i_inode.i_mutex);
 784         for (qx = 0; qx < num_qd; qx++) {
 785                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 786                                            GL_NOCACHE, &ghs[qx]);
 787                 if (error)
 788                         goto out;
 789         }
 790
 791         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 792         if (error)
 793                 goto out;
 794
 795         for (x = 0; x < num_qd; x++) {
 796                 offset = qd2offset(qda[x]);
 797                 if (gfs2_write_alloc_required(ip, offset,
 798                                               sizeof(struct gfs2_quota)))
 799                         nalloc++;
 800         }
 801
 802         /*
 803          * 1 blk for unstuffing inode if stuffed. We add this extra
 804          * block to the reservation unconditionally. If the inode
 805          * doesn't need unstuffing, the block will be released to the
 806          * rgrp since it won't be allocated during the transaction
 807          */
 808         /* +3 in the end for unstuffing block, inode size update block
 809          * and another block in case quota straddles page boundary and
 810          * two blocks need to be updated instead of 1 */
 811         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 812
 813         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 814         error = gfs2_inplace_reserve(ip, reserved, 0);
 815         if (error)
 816                 goto out_alloc;
 817
 818         if (nalloc)
 819                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 820
 821         error = gfs2_trans_begin(sdp, blocks, 0);
 822         if (error)
 823                 goto out_ipres;
 824
 825         for (x = 0; x < num_qd; x++) {
 826                 qd = qda[x];
 827                 offset = qd2offset(qd);
 828                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 829                 if (error)
 830                         goto out_end_trans;
 831
 832                 do_qc(qd, -qd->qd_change_sync);
 833                 set_bit(QDF_REFRESH, &qd->qd_flags);
 834         }
 835
 836         error = 0;
 837
 838 out_end_trans:
 839         gfs2_trans_end(sdp);
 840 out_ipres:
 841         gfs2_inplace_release(ip);
 842 out_alloc:
 843         gfs2_glock_dq_uninit(&i_gh);
 844 out:
 845         while (qx--)
 846                 gfs2_glock_dq_uninit(&ghs[qx]);
 847         mutex_unlock(&ip->i_inode.i_mutex);
 848         kfree(ghs);
 849         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 850         return error;
 851 }
 852
 853 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 854 {
 855         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 856         struct gfs2_quota q;
 857         struct gfs2_quota_lvb *qlvb;
 858         loff_t pos;
 859         int error;
 860
 861         memset(&q, 0, sizeof(struct gfs2_quota));
 862         pos = qd2offset(qd);
 863         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 864         if (error < 0)
 865                 return error;
 866
 867         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 868         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 869         qlvb->__pad = 0;
 870         qlvb->qb_limit = q.qu_limit;
 871         qlvb->qb_warn = q.qu_warn;
 872         qlvb->qb_value = q.qu_value;
 873         qd->qd_qb = *qlvb;
 874
 875         return 0;
 876 }
 877
 878 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 879                     struct gfs2_holder *q_gh)
 880 {
 881         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 882         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 883         struct gfs2_holder i_gh;
 884         int error;
 885
 886 restart:
 887         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 888         if (error)
 889                 return error;
 890
 891         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 892
 893         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 894                 gfs2_glock_dq_uninit(q_gh);
 895                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 896                                            GL_NOCACHE, q_gh);
 897                 if (error)
 898                         return error;
 899
 900                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 901                 if (error)
 902                         goto fail;
 903
 904                 error = update_qd(sdp, qd);
 905                 if (error)
 906                         goto fail_gunlock;
 907
 908                 gfs2_glock_dq_uninit(&i_gh);
 909                 gfs2_glock_dq_uninit(q_gh);
 910                 force_refresh = 0;
 911                 goto restart;
 912         }
 913
 914         return 0;
 915
 916 fail_gunlock:
 917         gfs2_glock_dq_uninit(&i_gh);
 918 fail:
 919         gfs2_glock_dq_uninit(q_gh);
 920         return error;
 921 }
 922
 923 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 924 {
 925         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 926         struct gfs2_quota_data *qd;
 927         unsigned int x;
 928         int error = 0;
 929
 930         error = gfs2_quota_hold(ip, uid, gid);
 931         if (error)
 932                 return error;
 933
 934         if (capable(CAP_SYS_RESOURCE) ||
 935             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 936                 return 0;
 937
 938         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 939              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 940
 941         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 942                 int force = NO_FORCE;
 943                 qd = ip->i_res->rs_qa_qd[x];
 944                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 945                         force = FORCE;
 946                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 947                 if (error)
 948                         break;
 949         }
 950
 951         if (!error)
 952                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 953         else {
 954                 while (x--)
 955                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 956                 gfs2_quota_unhold(ip);
 957         }
 958
 959         return error;
 960 }
 961
 962 static int need_sync(struct gfs2_quota_data *qd)
 963 {
 964         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 965         struct gfs2_tune *gt = &sdp->sd_tune;
 966         s64 value;
 967         unsigned int num, den;
 968         int do_sync = 1;
 969
 970         if (!qd->qd_qb.qb_limit)
 971                 return 0;
 972
 973         spin_lock(&qd_lru_lock);
 974         value = qd->qd_change;
 975         spin_unlock(&qd_lru_lock);
 976
 977         spin_lock(&gt->gt_spin);
 978         num = gt->gt_quota_scale_num;
 979         den = gt->gt_quota_scale_den;
 980         spin_unlock(&gt->gt_spin);
 981
 982         if (value < 0)
 983                 do_sync = 0;
 984         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 985                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 986                 do_sync = 0;
 987         else {
 988                 value *= gfs2_jindex_size(sdp) * num;
 989                 value = div_s64(value, den);
 990                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 991                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 992                         do_sync = 0;
 993         }
 994
 995         return do_sync;
 996 }
 997
 998 void gfs2_quota_unlock(struct gfs2_inode *ip)
 999 {
1000         struct gfs2_quota_data *qda[4];
1001         unsigned int count = 0;
1002         unsigned int x;
1003
1004         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1005                 goto out;
1006
1007         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1008                 struct gfs2_quota_data *qd;
1009                 int sync;
1010
1011                 qd = ip->i_res->rs_qa_qd[x];
1012                 sync = need_sync(qd);
1013
1014                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1015
1016                 if (sync && qd_trylock(qd))
1017                         qda[count++] = qd;
1018         }
1019
1020         if (count) {
1021                 do_sync(count, qda);
1022                 for (x = 0; x < count; x++)
1023                         qd_unlock(qda[x]);
1024         }
1025
1026 out:
1027         gfs2_quota_unhold(ip);
1028 }
1029
1030 #define MAX_LINE 256
1031
1032 static int print_message(struct gfs2_quota_data *qd, char *type)
1033 {
1034         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1035
1036         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1037                sdp->sd_fsname, type,
1038                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1039                from_kqid(&init_user_ns, qd->qd_id));
1040
1041         return 0;
1042 }
1043
1044 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1045 {
1046         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1047         struct gfs2_quota_data *qd;
1048         s64 value;
1049         unsigned int x;
1050         int error = 0;
1051
1052         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1053                 return 0;
1054
1055         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1056                 return 0;
1057
1058         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1059                 qd = ip->i_res->rs_qa_qd[x];
1060
1061                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1062                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1063                         continue;
1064
1065                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1066                 spin_lock(&qd_lru_lock);
1067                 value += qd->qd_change;
1068                 spin_unlock(&qd_lru_lock);
1069
1070                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1071                         print_message(qd, "exceeded");
1072                         quota_send_warning(qd->qd_id,
1073                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1074
1075                         error = -EDQUOT;
1076                         break;
1077                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1078                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1079                            time_after_eq(jiffies, qd->qd_last_warn +
1080                                          gfs2_tune_get(sdp,
1081                                                 gt_quota_warn_period) * HZ)) {
1082                         quota_send_warning(qd->qd_id,
1083                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1084                         error = print_message(qd, "warning");
1085                         qd->qd_last_warn = jiffies;
1086                 }
1087         }
1088
1089         return error;
1090 }
1091
1092 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1093                        kuid_t uid, kgid_t gid)
1094 {
1095         struct gfs2_quota_data *qd;
1096         unsigned int x;
1097
1098         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1099                 return;
1100         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1101                 return;
1102
1103         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1104                 qd = ip->i_res->rs_qa_qd[x];
1105
1106                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1107                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1108                         do_qc(qd, change);
1109                 }
1110         }
1111 }
1112
1113 int gfs2_quota_sync(struct super_block *sb, int type)
1114 {
1115         struct gfs2_sbd *sdp = sb->s_fs_info;
1116         struct gfs2_quota_data **qda;
1117         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1118         unsigned int num_qd;
1119         unsigned int x;
1120         int error = 0;
1121
1122         sdp->sd_quota_sync_gen++;
1123
1124         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1125         if (!qda)
1126                 return -ENOMEM;
1127
1128         do {
1129                 num_qd = 0;
1130
1131                 for (;;) {
1132                         error = qd_fish(sdp, qda + num_qd);
1133                         if (error || !qda[num_qd])
1134                                 break;
1135                         if (++num_qd == max_qd)
1136                                 break;
1137                 }
1138
1139                 if (num_qd) {
1140                         if (!error)
1141                                 error = do_sync(num_qd, qda);
1142                         if (!error)
1143                                 for (x = 0; x < num_qd; x++)
1144                                         qda[x]->qd_sync_gen =
1145                                                 sdp->sd_quota_sync_gen;
1146
1147                         for (x = 0; x < num_qd; x++)
1148                                 qd_unlock(qda[x]);
1149                 }
1150         } while (!error && num_qd == max_qd);
1151
1152         kfree(qda);
1153
1154         return error;
1155 }
1156
1157 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1158 {
1159         return gfs2_quota_sync(sb, type);
1160 }
1161
1162 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1163 {
1164         struct gfs2_quota_data *qd;
1165         struct gfs2_holder q_gh;
1166         int error;
1167
1168         error = qd_get(sdp, qid, &qd);
1169         if (error)
1170                 return error;
1171
1172         error = do_glock(qd, FORCE, &q_gh);
1173         if (!error)
1174                 gfs2_glock_dq_uninit(&q_gh);
1175
1176         qd_put(qd);
1177         return error;
1178 }
1179
1180 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1181 {
1182         const struct gfs2_quota_change *str = buf;
1183
1184         qc->qc_change = be64_to_cpu(str->qc_change);
1185         qc->qc_flags = be32_to_cpu(str->qc_flags);
1186         qc->qc_id = make_kqid(&init_user_ns,
1187                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1188                               be32_to_cpu(str->qc_id));
1189 }
1190
1191 int gfs2_quota_init(struct gfs2_sbd *sdp)
1192 {
1193         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1194         u64 size = i_size_read(sdp->sd_qc_inode);
1195         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1196         unsigned int x, slot = 0;
1197         unsigned int found = 0;
1198         u64 dblock;
1199         u32 extlen = 0;
1200         int error;
1201
1202         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1203                 return -EIO;
1204
1205         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1206         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1207
1208         error = -ENOMEM;
1209
1210         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1211                                        sizeof(unsigned char *), GFP_NOFS);
1212         if (!sdp->sd_quota_bitmap)
1213                 return error;
1214
1215         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1216                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1217                 if (!sdp->sd_quota_bitmap[x])
1218                         goto fail;
1219         }
1220
1221         for (x = 0; x < blocks; x++) {
1222                 struct buffer_head *bh;
1223                 unsigned int y;
1224
1225                 if (!extlen) {
1226                         int new = 0;
1227                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1228                         if (error)
1229                                 goto fail;
1230                 }
1231                 error = -EIO;
1232                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1233                 if (!bh)
1234                         goto fail;
1235                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1236                         brelse(bh);
1237                         goto fail;
1238                 }
1239
1240                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1241                      y++, slot++) {
1242                         struct gfs2_quota_change_host qc;
1243                         struct gfs2_quota_data *qd;
1244
1245                         gfs2_quota_change_in(&qc, bh->b_data +
1246                                           sizeof(struct gfs2_meta_header) +
1247                                           y * sizeof(struct gfs2_quota_change));
1248                         if (!qc.qc_change)
1249                                 continue;
1250
1251                         error = qd_alloc(sdp, qc.qc_id, &qd);
1252                         if (error) {
1253                                 brelse(bh);
1254                                 goto fail;
1255                         }
1256
1257                         set_bit(QDF_CHANGE, &qd->qd_flags);
1258                         qd->qd_change = qc.qc_change;
1259                         qd->qd_slot = slot;
1260                         qd->qd_slot_count = 1;
1261
1262                         spin_lock(&qd_lru_lock);
1263                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1264                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1265                         atomic_inc(&sdp->sd_quota_count);
1266                         spin_unlock(&qd_lru_lock);
1267
1268                         found++;
1269                 }
1270
1271                 brelse(bh);
1272                 dblock++;
1273                 extlen--;
1274         }
1275
1276         if (found)
1277                 fs_info(sdp, "found %u quota changes\n", found);
1278
1279         return 0;
1280
1281 fail:
1282         gfs2_quota_cleanup(sdp);
1283         return error;
1284 }
1285
1286 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1287 {
1288         struct list_head *head = &sdp->sd_quota_list;
1289         struct gfs2_quota_data *qd;
1290         unsigned int x;
1291
1292         spin_lock(&qd_lru_lock);
1293         while (!list_empty(head)) {
1294                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1295
1296                 if (atomic_read(&qd->qd_count) > 1 ||
1297                     (atomic_read(&qd->qd_count) &&
1298                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1299                         list_move(&qd->qd_list, head);
1300                         spin_unlock(&qd_lru_lock);
1301                         schedule();
1302                         spin_lock(&qd_lru_lock);
1303                         continue;
1304                 }
1305
1306                 list_del(&qd->qd_list);
1307                 /* Also remove if this qd exists in the reclaim list */
1308                 if (!list_empty(&qd->qd_reclaim)) {
1309                         list_del_init(&qd->qd_reclaim);
1310                         atomic_dec(&qd_lru_count);
1311                 }
1312                 atomic_dec(&sdp->sd_quota_count);
1313                 spin_unlock(&qd_lru_lock);
1314
1315                 if (!atomic_read(&qd->qd_count)) {
1316                         gfs2_assert_warn(sdp, !qd->qd_change);
1317                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1318                 } else
1319                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1320                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1321
1322                 gfs2_glock_put(qd->qd_gl);
1323                 kmem_cache_free(gfs2_quotad_cachep, qd);
1324
1325                 spin_lock(&qd_lru_lock);
1326         }
1327         spin_unlock(&qd_lru_lock);
1328
1329         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1330
1331         if (sdp->sd_quota_bitmap) {
1332                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1333                         kfree(sdp->sd_quota_bitmap[x]);
1334                 kfree(sdp->sd_quota_bitmap);
1335         }
1336 }
1337
1338 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1339 {
1340         if (error == 0 || error == -EROFS)
1341                 return;
1342         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1343                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1344 }
1345
1346 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1347                                int (*fxn)(struct super_block *sb, int type),
1348                                unsigned long t, unsigned long *timeo,
1349                                unsigned int *new_timeo)
1350 {
1351         if (t >= *timeo) {
1352                 int error = fxn(sdp->sd_vfs, 0);
1353                 quotad_error(sdp, msg, error);
1354                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1355         } else {
1356                 *timeo -= t;
1357         }
1358 }
1359
1360 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1361 {
1362         struct gfs2_inode *ip;
1363
1364         while(1) {
1365                 ip = NULL;
1366                 spin_lock(&sdp->sd_trunc_lock);
1367                 if (!list_empty(&sdp->sd_trunc_list)) {
1368                         ip = list_entry(sdp->sd_trunc_list.next,
1369                                         struct gfs2_inode, i_trunc_list);
1370                         list_del_init(&ip->i_trunc_list);
1371                 }
1372                 spin_unlock(&sdp->sd_trunc_lock);
1373                 if (ip == NULL)
1374                         return;
1375                 gfs2_glock_finish_truncate(ip);
1376         }
1377 }
1378
1379 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1380         if (!sdp->sd_statfs_force_sync) {
1381                 sdp->sd_statfs_force_sync = 1;
1382                 wake_up(&sdp->sd_quota_wait);
1383         }
1384 }
1385
1386
1387 /**
1388  * gfs2_quotad - Write cached quota changes into the quota file
1389  * @sdp: Pointer to GFS2 superblock
1390  *
1391  */
1392
1393 int gfs2_quotad(void *data)
1394 {
1395         struct gfs2_sbd *sdp = data;
1396         struct gfs2_tune *tune = &sdp->sd_tune;
1397         unsigned long statfs_timeo = 0;
1398         unsigned long quotad_timeo = 0;
1399         unsigned long t = 0;
1400         DEFINE_WAIT(wait);
1401         int empty;
1402
1403         while (!kthread_should_stop()) {
1404
1405                 /* Update the master statfs file */
1406                 if (sdp->sd_statfs_force_sync) {
1407                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1408                         quotad_error(sdp, "statfs", error);
1409                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1410                 }
1411                 else
1412                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1413                                            &statfs_timeo,
1414                                            &tune->gt_statfs_quantum);
1415
1416                 /* Update quota file */
1417                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1418                                    &quotad_timeo, &tune->gt_quota_quantum);
1419
1420                 /* Check for & recover partially truncated inodes */
1421                 quotad_check_trunc_list(sdp);
1422
1423                 try_to_freeze();
1424
1425                 t = min(quotad_timeo, statfs_timeo);
1426
1427                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1428                 spin_lock(&sdp->sd_trunc_lock);
1429                 empty = list_empty(&sdp->sd_trunc_list);
1430                 spin_unlock(&sdp->sd_trunc_lock);
1431                 if (empty && !sdp->sd_statfs_force_sync)
1432                         t -= schedule_timeout(t);
1433                 else
1434                         t = 0;
1435                 finish_wait(&sdp->sd_quota_wait, &wait);
1436         }
1437
1438         return 0;
1439 }
1440
1441 static int gfs2_quota_get_xstate(struct super_block *sb,
1442                                  struct fs_quota_stat *fqs)
1443 {
1444         struct gfs2_sbd *sdp = sb->s_fs_info;
1445
1446         memset(fqs, 0, sizeof(struct fs_quota_stat));
1447         fqs->qs_version = FS_QSTAT_VERSION;
1448
1449         switch (sdp->sd_args.ar_quota) {
1450         case GFS2_QUOTA_ON:
1451                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1452                 /*FALLTHRU*/
1453         case GFS2_QUOTA_ACCOUNT:
1454                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1455                 break;
1456         case GFS2_QUOTA_OFF:
1457                 break;
1458         }
1459
1460         if (sdp->sd_quota_inode) {
1461                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1462                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1463         }
1464         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1465         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1466         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1467         return 0;
1468 }
1469
1470 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1471                           struct fs_disk_quota *fdq)
1472 {
1473         struct gfs2_sbd *sdp = sb->s_fs_info;
1474         struct gfs2_quota_lvb *qlvb;
1475         struct gfs2_quota_data *qd;
1476         struct gfs2_holder q_gh;
1477         int error;
1478
1479         memset(fdq, 0, sizeof(struct fs_disk_quota));
1480
1481         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1482                 return -ESRCH; /* Crazy XFS error code */
1483
1484         if ((qid.type != USRQUOTA) &&
1485             (qid.type != GRPQUOTA))
1486                 return -EINVAL;
1487
1488         error = qd_get(sdp, qid, &qd);
1489         if (error)
1490                 return error;
1491         error = do_glock(qd, FORCE, &q_gh);
1492         if (error)
1493                 goto out;
1494
1495         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1496         fdq->d_version = FS_DQUOT_VERSION;
1497         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1498         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1499         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1500         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1501         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1502
1503         gfs2_glock_dq_uninit(&q_gh);
1504 out:
1505         qd_put(qd);
1506         return error;
1507 }
1508
1509 /* GFS2 only supports a subset of the XFS fields */
1510 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1511
1512 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1513                           struct fs_disk_quota *fdq)
1514 {
1515         struct gfs2_sbd *sdp = sb->s_fs_info;
1516         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1517         struct gfs2_quota_data *qd;
1518         struct gfs2_holder q_gh, i_gh;
1519         unsigned int data_blocks, ind_blocks;
1520         unsigned int blocks = 0;
1521         int alloc_required;
1522         loff_t offset;
1523         int error;
1524
1525         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1526                 return -ESRCH; /* Crazy XFS error code */
1527
1528         if ((qid.type != USRQUOTA) &&
1529             (qid.type != GRPQUOTA))
1530                 return -EINVAL;
1531
1532         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1533                 return -EINVAL;
1534
1535         error = qd_get(sdp, qid, &qd);
1536         if (error)
1537                 return error;
1538
1539         error = gfs2_rs_alloc(ip);
1540         if (error)
1541                 goto out_put;
1542
1543         mutex_lock(&ip->i_inode.i_mutex);
1544         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1545         if (error)
1546                 goto out_unlockput;
1547         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1548         if (error)
1549                 goto out_q;
1550
1551         /* Check for existing entry, if none then alloc new blocks */
1552         error = update_qd(sdp, qd);
1553         if (error)
1554                 goto out_i;
1555
1556         /* If nothing has changed, this is a no-op */
1557         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1558             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1559                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1560
1561         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1562             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1563                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1564
1565         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1566             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1567                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1568
1569         if (fdq->d_fieldmask == 0)
1570                 goto out_i;
1571
1572         offset = qd2offset(qd);
1573         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1574         if (gfs2_is_stuffed(ip))
1575                 alloc_required = 1;
1576         if (alloc_required) {
1577                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1578                                        &data_blocks, &ind_blocks);
1579                 blocks = 1 + data_blocks + ind_blocks;
1580                 error = gfs2_inplace_reserve(ip, blocks, 0);
1581                 if (error)
1582                         goto out_i;
1583                 blocks += gfs2_rg_blocks(ip, blocks);
1584         }
1585
1586         /* Some quotas span block boundaries and can update two blocks,
1587            adding an extra block to the transaction to handle such quotas */
1588         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1589         if (error)
1590                 goto out_release;
1591
1592         /* Apply changes */
1593         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1594
1595         gfs2_trans_end(sdp);
1596 out_release:
1597         if (alloc_required)
1598                 gfs2_inplace_release(ip);
1599 out_i:
1600         gfs2_glock_dq_uninit(&i_gh);
1601 out_q:
1602         gfs2_glock_dq_uninit(&q_gh);
1603 out_unlockput:
1604         mutex_unlock(&ip->i_inode.i_mutex);
1605 out_put:
1606         qd_put(qd);
1607         return error;
1608 }
1609
1610 const struct quotactl_ops gfs2_quotactl_ops = {
1611         .quota_sync     = gfs2_quota_sync,
1612         .get_xstate     = gfs2_quota_get_xstate,
1613         .get_dqblk      = gfs2_get_dqblk,
1614         .set_dqblk      = gfs2_set_dqblk,
1615 };