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 #include <linux/lockref.h>
  54
  55 #include "gfs2.h"
  56 #include "incore.h"
  57 #include "bmap.h"
  58 #include "glock.h"
  59 #include "glops.h"
  60 #include "log.h"
  61 #include "meta_io.h"
  62 #include "quota.h"
  63 #include "rgrp.h"
  64 #include "super.h"
  65 #include "trans.h"
  66 #include "inode.h"
  67 #include "util.h"
  68
  69 struct gfs2_quota_change_host {
  70         u64 qc_change;
  71         u32 qc_flags; /* GFS2_QCF_... */
  72         struct kqid qc_id;
  73 };
  74
  75 static LIST_HEAD(qd_lru_list);
  76 static atomic_t qd_lru_count = ATOMIC_INIT(0);
  77 static DEFINE_SPINLOCK(qd_lock);
  78
  79 unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
  80                                   struct shrink_control *sc)
  81 {
  82         struct gfs2_quota_data *qd;
  83         struct gfs2_sbd *sdp;
  84         int nr_to_scan = sc->nr_to_scan;
  85         long freed = 0;
  86
  87         if (!(sc->gfp_mask & __GFP_FS))
  88                 return SHRINK_STOP;
  89
  90         spin_lock(&qd_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_lock);
 110                 kmem_cache_free(gfs2_quotad_cachep, qd);
 111                 spin_lock(&qd_lock);
 112                 nr_to_scan--;
 113                 freed++;
 114         }
 115         spin_unlock(&qd_lock);
 116         return freed;
 117 }
 118
 119 unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 120                                    struct shrink_control *sc)
 121 {
 122         return vfs_pressure_ratio(atomic_read(&qd_lru_count));
 123 }
 124
 125 static u64 qd2index(struct gfs2_quota_data *qd)
 126 {
 127         struct kqid qid = qd->qd_id;
 128         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 129                 ((qid.type == USRQUOTA) ? 0 : 1);
 130 }
 131
 132 static u64 qd2offset(struct gfs2_quota_data *qd)
 133 {
 134         u64 offset;
 135
 136         offset = qd2index(qd);
 137         offset *= sizeof(struct gfs2_quota);
 138
 139         return offset;
 140 }
 141
 142 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
 143                     struct gfs2_quota_data **qdp)
 144 {
 145         struct gfs2_quota_data *qd;
 146         int error;
 147
 148         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 149         if (!qd)
 150                 return -ENOMEM;
 151
 152         qd->qd_lockref.count = 1;
 153         spin_lock_init(&qd->qd_lockref.lock);
 154         qd->qd_id = qid;
 155         qd->qd_slot = -1;
 156         INIT_LIST_HEAD(&qd->qd_reclaim);
 157
 158         error = gfs2_glock_get(sdp, qd2index(qd),
 159                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 160         if (error)
 161                 goto fail;
 162
 163         *qdp = qd;
 164
 165         return 0;
 166
 167 fail:
 168         kmem_cache_free(gfs2_quotad_cachep, qd);
 169         return error;
 170 }
 171
 172 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 173                   struct gfs2_quota_data **qdp)
 174 {
 175         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 176         int error, found;
 177
 178         *qdp = NULL;
 179
 180         for (;;) {
 181                 found = 0;
 182                 spin_lock(&qd_lock);
 183                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 184                         if (qid_eq(qd->qd_id, qid)) {
 185                                 lockref_get(&qd->qd_lockref);
 186                                 if (!list_empty(&qd->qd_reclaim)) {
 187                                         /* Remove it from reclaim list */
 188                                         list_del_init(&qd->qd_reclaim);
 189                                         atomic_dec(&qd_lru_count);
 190                                 }
 191                                 found = 1;
 192                                 break;
 193                         }
 194                 }
 195
 196                 if (!found)
 197                         qd = NULL;
 198
 199                 if (!qd && new_qd) {
 200                         qd = new_qd;
 201                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 202                         atomic_inc(&sdp->sd_quota_count);
 203                         new_qd = NULL;
 204                 }
 205
 206                 spin_unlock(&qd_lock);
 207
 208                 if (qd) {
 209                         if (new_qd) {
 210                                 gfs2_glock_put(new_qd->qd_gl);
 211                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 212                         }
 213                         *qdp = qd;
 214                         return 0;
 215                 }
 216
 217                 error = qd_alloc(sdp, qid, &new_qd);
 218                 if (error)
 219                         return error;
 220         }
 221 }
 222
 223 static void qd_hold(struct gfs2_quota_data *qd)
 224 {
 225         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 226         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 227         lockref_get(&qd->qd_lockref);
 228 }
 229
 230 static void qd_put(struct gfs2_quota_data *qd)
 231 {
 232         spin_lock(&qd_lock);
 233
 234         if (!lockref_put_or_lock(&qd->qd_lockref)) {
 235
 236                 /* Add to the reclaim list */
 237                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 238                 atomic_inc(&qd_lru_count);
 239
 240                 spin_unlock(&qd->qd_lockref.lock);
 241         }
 242
 243         spin_unlock(&qd_lock);
 244 }
 245
 246 static int slot_get(struct gfs2_quota_data *qd)
 247 {
 248         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 249         unsigned int c, o = 0, b;
 250         unsigned char byte = 0;
 251
 252         spin_lock(&qd_lock);
 253
 254         if (qd->qd_slot_count++) {
 255                 spin_unlock(&qd_lock);
 256                 return 0;
 257         }
 258
 259         for (c = 0; c < sdp->sd_quota_chunks; c++)
 260                 for (o = 0; o < PAGE_SIZE; o++) {
 261                         byte = sdp->sd_quota_bitmap[c][o];
 262                         if (byte != 0xFF)
 263                                 goto found;
 264                 }
 265
 266         goto fail;
 267
 268 found:
 269         for (b = 0; b < 8; b++)
 270                 if (!(byte & (1 << b)))
 271                         break;
 272         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 273
 274         if (qd->qd_slot >= sdp->sd_quota_slots)
 275                 goto fail;
 276
 277         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 278
 279         spin_unlock(&qd_lock);
 280
 281         return 0;
 282
 283 fail:
 284         qd->qd_slot_count--;
 285         spin_unlock(&qd_lock);
 286         return -ENOSPC;
 287 }
 288
 289 static void slot_hold(struct gfs2_quota_data *qd)
 290 {
 291         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 292
 293         spin_lock(&qd_lock);
 294         gfs2_assert(sdp, qd->qd_slot_count);
 295         qd->qd_slot_count++;
 296         spin_unlock(&qd_lock);
 297 }
 298
 299 static void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 300                              unsigned int bit, int new_value)
 301 {
 302         unsigned int c, o, b = bit;
 303         int old_value;
 304
 305         c = b / (8 * PAGE_SIZE);
 306         b %= 8 * PAGE_SIZE;
 307         o = b / 8;
 308         b %= 8;
 309
 310         old_value = (bitmap[c][o] & (1 << b));
 311         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 312
 313         if (new_value)
 314                 bitmap[c][o] |= 1 << b;
 315         else
 316                 bitmap[c][o] &= ~(1 << b);
 317 }
 318
 319 static void slot_put(struct gfs2_quota_data *qd)
 320 {
 321         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 322
 323         spin_lock(&qd_lock);
 324         gfs2_assert(sdp, qd->qd_slot_count);
 325         if (!--qd->qd_slot_count) {
 326                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 327                 qd->qd_slot = -1;
 328         }
 329         spin_unlock(&qd_lock);
 330 }
 331
 332 static int bh_get(struct gfs2_quota_data *qd)
 333 {
 334         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 335         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 336         unsigned int block, offset;
 337         struct buffer_head *bh;
 338         int error;
 339         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 340
 341         mutex_lock(&sdp->sd_quota_mutex);
 342
 343         if (qd->qd_bh_count++) {
 344                 mutex_unlock(&sdp->sd_quota_mutex);
 345                 return 0;
 346         }
 347
 348         block = qd->qd_slot / sdp->sd_qc_per_block;
 349         offset = qd->qd_slot % sdp->sd_qc_per_block;
 350
 351         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 352         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 353         if (error)
 354                 goto fail;
 355         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 356         if (error)
 357                 goto fail;
 358         error = -EIO;
 359         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 360                 goto fail_brelse;
 361
 362         qd->qd_bh = bh;
 363         qd->qd_bh_qc = (struct gfs2_quota_change *)
 364                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 365                  offset * sizeof(struct gfs2_quota_change));
 366
 367         mutex_unlock(&sdp->sd_quota_mutex);
 368
 369         return 0;
 370
 371 fail_brelse:
 372         brelse(bh);
 373 fail:
 374         qd->qd_bh_count--;
 375         mutex_unlock(&sdp->sd_quota_mutex);
 376         return error;
 377 }
 378
 379 static void bh_put(struct gfs2_quota_data *qd)
 380 {
 381         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 382
 383         mutex_lock(&sdp->sd_quota_mutex);
 384         gfs2_assert(sdp, qd->qd_bh_count);
 385         if (!--qd->qd_bh_count) {
 386                 brelse(qd->qd_bh);
 387                 qd->qd_bh = NULL;
 388                 qd->qd_bh_qc = NULL;
 389         }
 390         mutex_unlock(&sdp->sd_quota_mutex);
 391 }
 392
 393 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 394                          u64 *sync_gen)
 395 {
 396         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 397             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 398             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 399                 return 0;
 400
 401         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 402
 403         set_bit(QDF_LOCKED, &qd->qd_flags);
 404         gfs2_assert_warn(sdp, !__lockref_is_dead(&qd->qd_lockref));
 405         lockref_get(&qd->qd_lockref);
 406         qd->qd_change_sync = qd->qd_change;
 407         gfs2_assert_warn(sdp, qd->qd_slot_count);
 408         qd->qd_slot_count++;
 409         return 1;
 410 }
 411
 412 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 413 {
 414         struct gfs2_quota_data *qd = NULL;
 415         int error;
 416         int found = 0;
 417
 418         *qdp = NULL;
 419
 420         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 421                 return 0;
 422
 423         spin_lock(&qd_lock);
 424
 425         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 426                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
 427                 if (found)
 428                         break;
 429         }
 430
 431         if (!found)
 432                 qd = NULL;
 433
 434         spin_unlock(&qd_lock);
 435
 436         if (qd) {
 437                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 438                 error = bh_get(qd);
 439                 if (error) {
 440                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 441                         slot_put(qd);
 442                         qd_put(qd);
 443                         return error;
 444                 }
 445         }
 446
 447         *qdp = qd;
 448
 449         return 0;
 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_lock);
 602         qd->qd_change = x;
 603         spin_unlock(&qd_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         struct gfs2_alloc_parms ap = { .aflags = 0, };
 763         unsigned int data_blocks, ind_blocks;
 764         struct gfs2_holder *ghs, i_gh;
 765         unsigned int qx, x;
 766         struct gfs2_quota_data *qd;
 767         unsigned reserved;
 768         loff_t offset;
 769         unsigned int nalloc = 0, blocks;
 770         int error;
 771
 772         error = gfs2_rs_alloc(ip);
 773         if (error)
 774                 return error;
 775
 776         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 777                               &data_blocks, &ind_blocks);
 778
 779         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 780         if (!ghs)
 781                 return -ENOMEM;
 782
 783         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 784         mutex_lock(&ip->i_inode.i_mutex);
 785         for (qx = 0; qx < num_qd; qx++) {
 786                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 787                                            GL_NOCACHE, &ghs[qx]);
 788                 if (error)
 789                         goto out;
 790         }
 791
 792         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 793         if (error)
 794                 goto out;
 795
 796         for (x = 0; x < num_qd; x++) {
 797                 offset = qd2offset(qda[x]);
 798                 if (gfs2_write_alloc_required(ip, offset,
 799                                               sizeof(struct gfs2_quota)))
 800                         nalloc++;
 801         }
 802
 803         /*
 804          * 1 blk for unstuffing inode if stuffed. We add this extra
 805          * block to the reservation unconditionally. If the inode
 806          * doesn't need unstuffing, the block will be released to the
 807          * rgrp since it won't be allocated during the transaction
 808          */
 809         /* +3 in the end for unstuffing block, inode size update block
 810          * and another block in case quota straddles page boundary and
 811          * two blocks need to be updated instead of 1 */
 812         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 813
 814         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 815         ap.target = reserved;
 816         error = gfs2_inplace_reserve(ip, &ap);
 817         if (error)
 818                 goto out_alloc;
 819
 820         if (nalloc)
 821                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 822
 823         error = gfs2_trans_begin(sdp, blocks, 0);
 824         if (error)
 825                 goto out_ipres;
 826
 827         for (x = 0; x < num_qd; x++) {
 828                 qd = qda[x];
 829                 offset = qd2offset(qd);
 830                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 831                 if (error)
 832                         goto out_end_trans;
 833
 834                 do_qc(qd, -qd->qd_change_sync);
 835                 set_bit(QDF_REFRESH, &qd->qd_flags);
 836         }
 837
 838         error = 0;
 839
 840 out_end_trans:
 841         gfs2_trans_end(sdp);
 842 out_ipres:
 843         gfs2_inplace_release(ip);
 844 out_alloc:
 845         gfs2_glock_dq_uninit(&i_gh);
 846 out:
 847         while (qx--)
 848                 gfs2_glock_dq_uninit(&ghs[qx]);
 849         mutex_unlock(&ip->i_inode.i_mutex);
 850         kfree(ghs);
 851         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 852         return error;
 853 }
 854
 855 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 856 {
 857         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 858         struct gfs2_quota q;
 859         struct gfs2_quota_lvb *qlvb;
 860         loff_t pos;
 861         int error;
 862
 863         memset(&q, 0, sizeof(struct gfs2_quota));
 864         pos = qd2offset(qd);
 865         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 866         if (error < 0)
 867                 return error;
 868
 869         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 870         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 871         qlvb->__pad = 0;
 872         qlvb->qb_limit = q.qu_limit;
 873         qlvb->qb_warn = q.qu_warn;
 874         qlvb->qb_value = q.qu_value;
 875         qd->qd_qb = *qlvb;
 876
 877         return 0;
 878 }
 879
 880 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 881                     struct gfs2_holder *q_gh)
 882 {
 883         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 884         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 885         struct gfs2_holder i_gh;
 886         int error;
 887
 888 restart:
 889         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 890         if (error)
 891                 return error;
 892
 893         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 894
 895         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 896                 gfs2_glock_dq_uninit(q_gh);
 897                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 898                                            GL_NOCACHE, q_gh);
 899                 if (error)
 900                         return error;
 901
 902                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 903                 if (error)
 904                         goto fail;
 905
 906                 error = update_qd(sdp, qd);
 907                 if (error)
 908                         goto fail_gunlock;
 909
 910                 gfs2_glock_dq_uninit(&i_gh);
 911                 gfs2_glock_dq_uninit(q_gh);
 912                 force_refresh = 0;
 913                 goto restart;
 914         }
 915
 916         return 0;
 917
 918 fail_gunlock:
 919         gfs2_glock_dq_uninit(&i_gh);
 920 fail:
 921         gfs2_glock_dq_uninit(q_gh);
 922         return error;
 923 }
 924
 925 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 926 {
 927         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 928         struct gfs2_quota_data *qd;
 929         unsigned int x;
 930         int error = 0;
 931
 932         error = gfs2_quota_hold(ip, uid, gid);
 933         if (error)
 934                 return error;
 935
 936         if (capable(CAP_SYS_RESOURCE) ||
 937             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 938                 return 0;
 939
 940         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 941              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 942
 943         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 944                 int force = NO_FORCE;
 945                 qd = ip->i_res->rs_qa_qd[x];
 946                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 947                         force = FORCE;
 948                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 949                 if (error)
 950                         break;
 951         }
 952
 953         if (!error)
 954                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 955         else {
 956                 while (x--)
 957                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 958                 gfs2_quota_unhold(ip);
 959         }
 960
 961         return error;
 962 }
 963
 964 static int need_sync(struct gfs2_quota_data *qd)
 965 {
 966         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 967         struct gfs2_tune *gt = &sdp->sd_tune;
 968         s64 value;
 969         unsigned int num, den;
 970         int do_sync = 1;
 971
 972         if (!qd->qd_qb.qb_limit)
 973                 return 0;
 974
 975         spin_lock(&qd_lock);
 976         value = qd->qd_change;
 977         spin_unlock(&qd_lock);
 978
 979         spin_lock(&gt->gt_spin);
 980         num = gt->gt_quota_scale_num;
 981         den = gt->gt_quota_scale_den;
 982         spin_unlock(&gt->gt_spin);
 983
 984         if (value < 0)
 985                 do_sync = 0;
 986         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 987                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 988                 do_sync = 0;
 989         else {
 990                 value *= gfs2_jindex_size(sdp) * num;
 991                 value = div_s64(value, den);
 992                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 993                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 994                         do_sync = 0;
 995         }
 996
 997         return do_sync;
 998 }
 999
1000 void gfs2_quota_unlock(struct gfs2_inode *ip)
1001 {
1002         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1003         struct gfs2_quota_data *qda[4];
1004         unsigned int count = 0;
1005         unsigned int x;
1006         int found;
1007
1008         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1009                 goto out;
1010
1011         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1012                 struct gfs2_quota_data *qd;
1013                 int sync;
1014
1015                 qd = ip->i_res->rs_qa_qd[x];
1016                 sync = need_sync(qd);
1017
1018                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1019                 if (!sync)
1020                         continue;
1021
1022                 spin_lock(&qd_lock);
1023                 found = qd_check_sync(sdp, qd, NULL);
1024                 spin_unlock(&qd_lock);
1025
1026                 if (!found)
1027                         continue;
1028
1029                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1030                 if (bh_get(qd)) {
1031                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1032                         slot_put(qd);
1033                         qd_put(qd);
1034                         continue;
1035                 }
1036
1037                 qda[count++] = qd;
1038         }
1039
1040         if (count) {
1041                 do_sync(count, qda);
1042                 for (x = 0; x < count; x++)
1043                         qd_unlock(qda[x]);
1044         }
1045
1046 out:
1047         gfs2_quota_unhold(ip);
1048 }
1049
1050 #define MAX_LINE 256
1051
1052 static int print_message(struct gfs2_quota_data *qd, char *type)
1053 {
1054         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1055
1056         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1057                sdp->sd_fsname, type,
1058                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1059                from_kqid(&init_user_ns, qd->qd_id));
1060
1061         return 0;
1062 }
1063
1064 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1065 {
1066         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1067         struct gfs2_quota_data *qd;
1068         s64 value;
1069         unsigned int x;
1070         int error = 0;
1071
1072         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1073                 return 0;
1074
1075         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1076                 return 0;
1077
1078         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1079                 qd = ip->i_res->rs_qa_qd[x];
1080
1081                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1082                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1083                         continue;
1084
1085                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1086                 spin_lock(&qd_lock);
1087                 value += qd->qd_change;
1088                 spin_unlock(&qd_lock);
1089
1090                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1091                         print_message(qd, "exceeded");
1092                         quota_send_warning(qd->qd_id,
1093                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1094
1095                         error = -EDQUOT;
1096                         break;
1097                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1098                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1099                            time_after_eq(jiffies, qd->qd_last_warn +
1100                                          gfs2_tune_get(sdp,
1101                                                 gt_quota_warn_period) * HZ)) {
1102                         quota_send_warning(qd->qd_id,
1103                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1104                         error = print_message(qd, "warning");
1105                         qd->qd_last_warn = jiffies;
1106                 }
1107         }
1108
1109         return error;
1110 }
1111
1112 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1113                        kuid_t uid, kgid_t gid)
1114 {
1115         struct gfs2_quota_data *qd;
1116         unsigned int x;
1117
1118         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1119                 return;
1120         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1121                 return;
1122
1123         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1124                 qd = ip->i_res->rs_qa_qd[x];
1125
1126                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1127                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1128                         do_qc(qd, change);
1129                 }
1130         }
1131 }
1132
1133 int gfs2_quota_sync(struct super_block *sb, int type)
1134 {
1135         struct gfs2_sbd *sdp = sb->s_fs_info;
1136         struct gfs2_quota_data **qda;
1137         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1138         unsigned int num_qd;
1139         unsigned int x;
1140         int error = 0;
1141
1142         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1143         if (!qda)
1144                 return -ENOMEM;
1145
1146         mutex_lock(&sdp->sd_quota_sync_mutex);
1147         sdp->sd_quota_sync_gen++;
1148
1149         do {
1150                 num_qd = 0;
1151
1152                 for (;;) {
1153                         error = qd_fish(sdp, qda + num_qd);
1154                         if (error || !qda[num_qd])
1155                                 break;
1156                         if (++num_qd == max_qd)
1157                                 break;
1158                 }
1159
1160                 if (num_qd) {
1161                         if (!error)
1162                                 error = do_sync(num_qd, qda);
1163                         if (!error)
1164                                 for (x = 0; x < num_qd; x++)
1165                                         qda[x]->qd_sync_gen =
1166                                                 sdp->sd_quota_sync_gen;
1167
1168                         for (x = 0; x < num_qd; x++)
1169                                 qd_unlock(qda[x]);
1170                 }
1171         } while (!error && num_qd == max_qd);
1172
1173         mutex_unlock(&sdp->sd_quota_sync_mutex);
1174         kfree(qda);
1175
1176         return error;
1177 }
1178
1179 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1180 {
1181         struct gfs2_quota_data *qd;
1182         struct gfs2_holder q_gh;
1183         int error;
1184
1185         error = qd_get(sdp, qid, &qd);
1186         if (error)
1187                 return error;
1188
1189         error = do_glock(qd, FORCE, &q_gh);
1190         if (!error)
1191                 gfs2_glock_dq_uninit(&q_gh);
1192
1193         qd_put(qd);
1194         return error;
1195 }
1196
1197 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1198 {
1199         const struct gfs2_quota_change *str = buf;
1200
1201         qc->qc_change = be64_to_cpu(str->qc_change);
1202         qc->qc_flags = be32_to_cpu(str->qc_flags);
1203         qc->qc_id = make_kqid(&init_user_ns,
1204                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1205                               be32_to_cpu(str->qc_id));
1206 }
1207
1208 int gfs2_quota_init(struct gfs2_sbd *sdp)
1209 {
1210         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1211         u64 size = i_size_read(sdp->sd_qc_inode);
1212         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1213         unsigned int x, slot = 0;
1214         unsigned int found = 0;
1215         u64 dblock;
1216         u32 extlen = 0;
1217         int error;
1218
1219         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1220                 return -EIO;
1221
1222         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1223         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1224
1225         error = -ENOMEM;
1226
1227         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1228                                        sizeof(unsigned char *), GFP_NOFS);
1229         if (!sdp->sd_quota_bitmap)
1230                 return error;
1231
1232         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1233                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1234                 if (!sdp->sd_quota_bitmap[x])
1235                         goto fail;
1236         }
1237
1238         for (x = 0; x < blocks; x++) {
1239                 struct buffer_head *bh;
1240                 unsigned int y;
1241
1242                 if (!extlen) {
1243                         int new = 0;
1244                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1245                         if (error)
1246                                 goto fail;
1247                 }
1248                 error = -EIO;
1249                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1250                 if (!bh)
1251                         goto fail;
1252                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1253                         brelse(bh);
1254                         goto fail;
1255                 }
1256
1257                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1258                      y++, slot++) {
1259                         struct gfs2_quota_change_host qc;
1260                         struct gfs2_quota_data *qd;
1261
1262                         gfs2_quota_change_in(&qc, bh->b_data +
1263                                           sizeof(struct gfs2_meta_header) +
1264                                           y * sizeof(struct gfs2_quota_change));
1265                         if (!qc.qc_change)
1266                                 continue;
1267
1268                         error = qd_alloc(sdp, qc.qc_id, &qd);
1269                         if (error) {
1270                                 brelse(bh);
1271                                 goto fail;
1272                         }
1273
1274                         set_bit(QDF_CHANGE, &qd->qd_flags);
1275                         qd->qd_change = qc.qc_change;
1276                         qd->qd_slot = slot;
1277                         qd->qd_slot_count = 1;
1278
1279                         spin_lock(&qd_lock);
1280                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1281                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1282                         atomic_inc(&sdp->sd_quota_count);
1283                         spin_unlock(&qd_lock);
1284
1285                         found++;
1286                 }
1287
1288                 brelse(bh);
1289                 dblock++;
1290                 extlen--;
1291         }
1292
1293         if (found)
1294                 fs_info(sdp, "found %u quota changes\n", found);
1295
1296         return 0;
1297
1298 fail:
1299         gfs2_quota_cleanup(sdp);
1300         return error;
1301 }
1302
1303 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1304 {
1305         struct list_head *head = &sdp->sd_quota_list;
1306         struct gfs2_quota_data *qd;
1307         unsigned int x;
1308
1309         spin_lock(&qd_lock);
1310         while (!list_empty(head)) {
1311                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1312
1313                 /*
1314                  * To be removed in due course... we should be able to
1315                  * ensure that all refs to the qd have done by this point
1316                  * so that this rather odd test is not required
1317                  */
1318                 spin_lock(&qd->qd_lockref.lock);
1319                 if (qd->qd_lockref.count > 1 ||
1320                     (qd->qd_lockref.count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1321                         spin_unlock(&qd->qd_lockref.lock);
1322                         list_move(&qd->qd_list, head);
1323                         spin_unlock(&qd_lock);
1324                         schedule();
1325                         spin_lock(&qd_lock);
1326                         continue;
1327                 }
1328                 spin_unlock(&qd->qd_lockref.lock);
1329
1330                 list_del(&qd->qd_list);
1331                 /* Also remove if this qd exists in the reclaim list */
1332                 if (!list_empty(&qd->qd_reclaim)) {
1333                         list_del_init(&qd->qd_reclaim);
1334                         atomic_dec(&qd_lru_count);
1335                 }
1336                 atomic_dec(&sdp->sd_quota_count);
1337                 spin_unlock(&qd_lock);
1338
1339                 if (!qd->qd_lockref.count) {
1340                         gfs2_assert_warn(sdp, !qd->qd_change);
1341                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1342                 } else
1343                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1344                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1345
1346                 gfs2_glock_put(qd->qd_gl);
1347                 kmem_cache_free(gfs2_quotad_cachep, qd);
1348
1349                 spin_lock(&qd_lock);
1350         }
1351         spin_unlock(&qd_lock);
1352
1353         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1354
1355         if (sdp->sd_quota_bitmap) {
1356                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1357                         kfree(sdp->sd_quota_bitmap[x]);
1358                 kfree(sdp->sd_quota_bitmap);
1359         }
1360 }
1361
1362 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1363 {
1364         if (error == 0 || error == -EROFS)
1365                 return;
1366         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1367                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1368 }
1369
1370 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1371                                int (*fxn)(struct super_block *sb, int type),
1372                                unsigned long t, unsigned long *timeo,
1373                                unsigned int *new_timeo)
1374 {
1375         if (t >= *timeo) {
1376                 int error = fxn(sdp->sd_vfs, 0);
1377                 quotad_error(sdp, msg, error);
1378                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1379         } else {
1380                 *timeo -= t;
1381         }
1382 }
1383
1384 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1385 {
1386         struct gfs2_inode *ip;
1387
1388         while(1) {
1389                 ip = NULL;
1390                 spin_lock(&sdp->sd_trunc_lock);
1391                 if (!list_empty(&sdp->sd_trunc_list)) {
1392                         ip = list_entry(sdp->sd_trunc_list.next,
1393                                         struct gfs2_inode, i_trunc_list);
1394                         list_del_init(&ip->i_trunc_list);
1395                 }
1396                 spin_unlock(&sdp->sd_trunc_lock);
1397                 if (ip == NULL)
1398                         return;
1399                 gfs2_glock_finish_truncate(ip);
1400         }
1401 }
1402
1403 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1404         if (!sdp->sd_statfs_force_sync) {
1405                 sdp->sd_statfs_force_sync = 1;
1406                 wake_up(&sdp->sd_quota_wait);
1407         }
1408 }
1409
1410
1411 /**
1412  * gfs2_quotad - Write cached quota changes into the quota file
1413  * @sdp: Pointer to GFS2 superblock
1414  *
1415  */
1416
1417 int gfs2_quotad(void *data)
1418 {
1419         struct gfs2_sbd *sdp = data;
1420         struct gfs2_tune *tune = &sdp->sd_tune;
1421         unsigned long statfs_timeo = 0;
1422         unsigned long quotad_timeo = 0;
1423         unsigned long t = 0;
1424         DEFINE_WAIT(wait);
1425         int empty;
1426
1427         while (!kthread_should_stop()) {
1428
1429                 /* Update the master statfs file */
1430                 if (sdp->sd_statfs_force_sync) {
1431                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1432                         quotad_error(sdp, "statfs", error);
1433                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1434                 }
1435                 else
1436                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1437                                            &statfs_timeo,
1438                                            &tune->gt_statfs_quantum);
1439
1440                 /* Update quota file */
1441                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1442                                    &quotad_timeo, &tune->gt_quota_quantum);
1443
1444                 /* Check for & recover partially truncated inodes */
1445                 quotad_check_trunc_list(sdp);
1446
1447                 try_to_freeze();
1448
1449                 t = min(quotad_timeo, statfs_timeo);
1450
1451                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1452                 spin_lock(&sdp->sd_trunc_lock);
1453                 empty = list_empty(&sdp->sd_trunc_list);
1454                 spin_unlock(&sdp->sd_trunc_lock);
1455                 if (empty && !sdp->sd_statfs_force_sync)
1456                         t -= schedule_timeout(t);
1457                 else
1458                         t = 0;
1459                 finish_wait(&sdp->sd_quota_wait, &wait);
1460         }
1461
1462         return 0;
1463 }
1464
1465 static int gfs2_quota_get_xstate(struct super_block *sb,
1466                                  struct fs_quota_stat *fqs)
1467 {
1468         struct gfs2_sbd *sdp = sb->s_fs_info;
1469
1470         memset(fqs, 0, sizeof(struct fs_quota_stat));
1471         fqs->qs_version = FS_QSTAT_VERSION;
1472
1473         switch (sdp->sd_args.ar_quota) {
1474         case GFS2_QUOTA_ON:
1475                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1476                 /*FALLTHRU*/
1477         case GFS2_QUOTA_ACCOUNT:
1478                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1479                 break;
1480         case GFS2_QUOTA_OFF:
1481                 break;
1482         }
1483
1484         if (sdp->sd_quota_inode) {
1485                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1486                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1487         }
1488         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1489         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1490         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1491         return 0;
1492 }
1493
1494 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1495                           struct fs_disk_quota *fdq)
1496 {
1497         struct gfs2_sbd *sdp = sb->s_fs_info;
1498         struct gfs2_quota_lvb *qlvb;
1499         struct gfs2_quota_data *qd;
1500         struct gfs2_holder q_gh;
1501         int error;
1502
1503         memset(fdq, 0, sizeof(struct fs_disk_quota));
1504
1505         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1506                 return -ESRCH; /* Crazy XFS error code */
1507
1508         if ((qid.type != USRQUOTA) &&
1509             (qid.type != GRPQUOTA))
1510                 return -EINVAL;
1511
1512         error = qd_get(sdp, qid, &qd);
1513         if (error)
1514                 return error;
1515         error = do_glock(qd, FORCE, &q_gh);
1516         if (error)
1517                 goto out;
1518
1519         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1520         fdq->d_version = FS_DQUOT_VERSION;
1521         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1522         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1523         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1524         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1525         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1526
1527         gfs2_glock_dq_uninit(&q_gh);
1528 out:
1529         qd_put(qd);
1530         return error;
1531 }
1532
1533 /* GFS2 only supports a subset of the XFS fields */
1534 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1535
1536 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1537                           struct fs_disk_quota *fdq)
1538 {
1539         struct gfs2_sbd *sdp = sb->s_fs_info;
1540         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1541         struct gfs2_quota_data *qd;
1542         struct gfs2_holder q_gh, i_gh;
1543         unsigned int data_blocks, ind_blocks;
1544         unsigned int blocks = 0;
1545         int alloc_required;
1546         loff_t offset;
1547         int error;
1548
1549         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1550                 return -ESRCH; /* Crazy XFS error code */
1551
1552         if ((qid.type != USRQUOTA) &&
1553             (qid.type != GRPQUOTA))
1554                 return -EINVAL;
1555
1556         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1557                 return -EINVAL;
1558
1559         error = qd_get(sdp, qid, &qd);
1560         if (error)
1561                 return error;
1562
1563         error = gfs2_rs_alloc(ip);
1564         if (error)
1565                 goto out_put;
1566
1567         mutex_lock(&ip->i_inode.i_mutex);
1568         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1569         if (error)
1570                 goto out_unlockput;
1571         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1572         if (error)
1573                 goto out_q;
1574
1575         /* Check for existing entry, if none then alloc new blocks */
1576         error = update_qd(sdp, qd);
1577         if (error)
1578                 goto out_i;
1579
1580         /* If nothing has changed, this is a no-op */
1581         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1582             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1583                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1584
1585         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1586             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1587                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1588
1589         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1590             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1591                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1592
1593         if (fdq->d_fieldmask == 0)
1594                 goto out_i;
1595
1596         offset = qd2offset(qd);
1597         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1598         if (gfs2_is_stuffed(ip))
1599                 alloc_required = 1;
1600         if (alloc_required) {
1601                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1602                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1603                                        &data_blocks, &ind_blocks);
1604                 blocks = 1 + data_blocks + ind_blocks;
1605                 ap.target = blocks;
1606                 error = gfs2_inplace_reserve(ip, &ap);
1607                 if (error)
1608                         goto out_i;
1609                 blocks += gfs2_rg_blocks(ip, blocks);
1610         }
1611
1612         /* Some quotas span block boundaries and can update two blocks,
1613            adding an extra block to the transaction to handle such quotas */
1614         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1615         if (error)
1616                 goto out_release;
1617
1618         /* Apply changes */
1619         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1620
1621         gfs2_trans_end(sdp);
1622 out_release:
1623         if (alloc_required)
1624                 gfs2_inplace_release(ip);
1625 out_i:
1626         gfs2_glock_dq_uninit(&i_gh);
1627 out_q:
1628         gfs2_glock_dq_uninit(&q_gh);
1629 out_unlockput:
1630         mutex_unlock(&ip->i_inode.i_mutex);
1631 out_put:
1632         qd_put(qd);
1633         return error;
1634 }
1635
1636 const struct quotactl_ops gfs2_quotactl_ops = {
1637         .quota_sync     = gfs2_quota_sync,
1638         .get_xstate     = gfs2_quota_get_xstate,
1639         .get_dqblk      = gfs2_get_dqblk,
1640         .set_dqblk      = gfs2_set_dqblk,
1641 };