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 #include <linux/list_lru.h>
  55
  56 #include "gfs2.h"
  57 #include "incore.h"
  58 #include "bmap.h"
  59 #include "glock.h"
  60 #include "glops.h"
  61 #include "log.h"
  62 #include "meta_io.h"
  63 #include "quota.h"
  64 #include "rgrp.h"
  65 #include "super.h"
  66 #include "trans.h"
  67 #include "inode.h"
  68 #include "util.h"
  69
  70 struct gfs2_quota_change_host {
  71         u64 qc_change;
  72         u32 qc_flags; /* GFS2_QCF_... */
  73         struct kqid qc_id;
  74 };
  75
  76 /* Lock order: qd_lock -> qd->lockref.lock -> lru lock */
  77 static DEFINE_SPINLOCK(qd_lock);
  78 struct list_lru gfs2_qd_lru;
  79
  80 static void gfs2_qd_dispose(struct list_head *list)
  81 {
  82         struct gfs2_quota_data *qd;
  83         struct gfs2_sbd *sdp;
  84
  85         while (!list_empty(list)) {
  86                 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
  87                 sdp = qd->qd_gl->gl_sbd;
  88
  89                 list_del(&qd->qd_lru);
  90
  91                 /* Free from the filesystem-specific list */
  92                 spin_lock(&qd_lock);
  93                 list_del(&qd->qd_list);
  94                 spin_unlock(&qd_lock);
  95
  96                 gfs2_assert_warn(sdp, !qd->qd_change);
  97                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
  98                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
  99
 100                 gfs2_glock_put(qd->qd_gl);
 101                 atomic_dec(&sdp->sd_quota_count);
 102
 103                 /* Delete it from the common reclaim list */
 104                 kmem_cache_free(gfs2_quotad_cachep, qd);
 105         }
 106 }
 107
 108
 109 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
 110 {
 111         struct list_head *dispose = arg;
 112         struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
 113
 114         if (!spin_trylock(&qd->qd_lockref.lock))
 115                 return LRU_SKIP;
 116
 117         if (qd->qd_lockref.count == 0) {
 118                 lockref_mark_dead(&qd->qd_lockref);
 119                 list_move(&qd->qd_lru, dispose);
 120         }
 121
 122         spin_unlock(&qd->qd_lockref.lock);
 123         return LRU_REMOVED;
 124 }
 125
 126 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 127                                          struct shrink_control *sc)
 128 {
 129         LIST_HEAD(dispose);
 130         unsigned long freed;
 131
 132         if (!(sc->gfp_mask & __GFP_FS))
 133                 return SHRINK_STOP;
 134
 135         freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
 136                                    &dispose, &sc->nr_to_scan);
 137
 138         gfs2_qd_dispose(&dispose);
 139
 140         return freed;
 141 }
 142
 143 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 144                                           struct shrink_control *sc)
 145 {
 146         return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
 147 }
 148
 149 struct shrinker gfs2_qd_shrinker = {
 150         .count_objects = gfs2_qd_shrink_count,
 151         .scan_objects = gfs2_qd_shrink_scan,
 152         .seeks = DEFAULT_SEEKS,
 153         .flags = SHRINKER_NUMA_AWARE,
 154 };
 155
 156
 157 static u64 qd2index(struct gfs2_quota_data *qd)
 158 {
 159         struct kqid qid = qd->qd_id;
 160         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 161                 ((qid.type == USRQUOTA) ? 0 : 1);
 162 }
 163
 164 static u64 qd2offset(struct gfs2_quota_data *qd)
 165 {
 166         u64 offset;
 167
 168         offset = qd2index(qd);
 169         offset *= sizeof(struct gfs2_quota);
 170
 171         return offset;
 172 }
 173
 174 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
 175                     struct gfs2_quota_data **qdp)
 176 {
 177         struct gfs2_quota_data *qd;
 178         int error;
 179
 180         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 181         if (!qd)
 182                 return -ENOMEM;
 183
 184         qd->qd_lockref.count = 1;
 185         spin_lock_init(&qd->qd_lockref.lock);
 186         qd->qd_id = qid;
 187         qd->qd_slot = -1;
 188         INIT_LIST_HEAD(&qd->qd_lru);
 189
 190         error = gfs2_glock_get(sdp, qd2index(qd),
 191                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 192         if (error)
 193                 goto fail;
 194
 195         *qdp = qd;
 196
 197         return 0;
 198
 199 fail:
 200         kmem_cache_free(gfs2_quotad_cachep, qd);
 201         return error;
 202 }
 203
 204 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 205                   struct gfs2_quota_data **qdp)
 206 {
 207         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 208         int error, found;
 209
 210         *qdp = NULL;
 211
 212         for (;;) {
 213                 found = 0;
 214                 spin_lock(&qd_lock);
 215                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 216                         if (qid_eq(qd->qd_id, qid) &&
 217                             lockref_get_not_dead(&qd->qd_lockref)) {
 218                                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 219                                 found = 1;
 220                                 break;
 221                         }
 222                 }
 223
 224                 if (!found)
 225                         qd = NULL;
 226
 227                 if (!qd && new_qd) {
 228                         qd = new_qd;
 229                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 230                         atomic_inc(&sdp->sd_quota_count);
 231                         new_qd = NULL;
 232                 }
 233
 234                 spin_unlock(&qd_lock);
 235
 236                 if (qd) {
 237                         if (new_qd) {
 238                                 gfs2_glock_put(new_qd->qd_gl);
 239                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 240                         }
 241                         *qdp = qd;
 242                         return 0;
 243                 }
 244
 245                 error = qd_alloc(sdp, qid, &new_qd);
 246                 if (error)
 247                         return error;
 248         }
 249 }
 250
 251 static void qd_hold(struct gfs2_quota_data *qd)
 252 {
 253         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 254         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 255         lockref_get(&qd->qd_lockref);
 256 }
 257
 258 static void qd_put(struct gfs2_quota_data *qd)
 259 {
 260         if (lockref_put_or_lock(&qd->qd_lockref))
 261                 return;
 262
 263         qd->qd_lockref.count = 0;
 264         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 265         spin_unlock(&qd->qd_lockref.lock);
 266
 267 }
 268
 269 static int slot_get(struct gfs2_quota_data *qd)
 270 {
 271         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 272         unsigned int c, o = 0, b;
 273         unsigned char byte = 0;
 274
 275         spin_lock(&qd_lock);
 276
 277         if (qd->qd_slot_count++) {
 278                 spin_unlock(&qd_lock);
 279                 return 0;
 280         }
 281
 282         for (c = 0; c < sdp->sd_quota_chunks; c++)
 283                 for (o = 0; o < PAGE_SIZE; o++) {
 284                         byte = sdp->sd_quota_bitmap[c][o];
 285                         if (byte != 0xFF)
 286                                 goto found;
 287                 }
 288
 289         goto fail;
 290
 291 found:
 292         for (b = 0; b < 8; b++)
 293                 if (!(byte & (1 << b)))
 294                         break;
 295         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 296
 297         if (qd->qd_slot >= sdp->sd_quota_slots)
 298                 goto fail;
 299
 300         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 301
 302         spin_unlock(&qd_lock);
 303
 304         return 0;
 305
 306 fail:
 307         qd->qd_slot_count--;
 308         spin_unlock(&qd_lock);
 309         return -ENOSPC;
 310 }
 311
 312 static void slot_hold(struct gfs2_quota_data *qd)
 313 {
 314         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 315
 316         spin_lock(&qd_lock);
 317         gfs2_assert(sdp, qd->qd_slot_count);
 318         qd->qd_slot_count++;
 319         spin_unlock(&qd_lock);
 320 }
 321
 322 static void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 323                              unsigned int bit, int new_value)
 324 {
 325         unsigned int c, o, b = bit;
 326         int old_value;
 327
 328         c = b / (8 * PAGE_SIZE);
 329         b %= 8 * PAGE_SIZE;
 330         o = b / 8;
 331         b %= 8;
 332
 333         old_value = (bitmap[c][o] & (1 << b));
 334         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 335
 336         if (new_value)
 337                 bitmap[c][o] |= 1 << b;
 338         else
 339                 bitmap[c][o] &= ~(1 << b);
 340 }
 341
 342 static void slot_put(struct gfs2_quota_data *qd)
 343 {
 344         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 345
 346         spin_lock(&qd_lock);
 347         gfs2_assert(sdp, qd->qd_slot_count);
 348         if (!--qd->qd_slot_count) {
 349                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 350                 qd->qd_slot = -1;
 351         }
 352         spin_unlock(&qd_lock);
 353 }
 354
 355 static int bh_get(struct gfs2_quota_data *qd)
 356 {
 357         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 358         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 359         unsigned int block, offset;
 360         struct buffer_head *bh;
 361         int error;
 362         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 363
 364         mutex_lock(&sdp->sd_quota_mutex);
 365
 366         if (qd->qd_bh_count++) {
 367                 mutex_unlock(&sdp->sd_quota_mutex);
 368                 return 0;
 369         }
 370
 371         block = qd->qd_slot / sdp->sd_qc_per_block;
 372         offset = qd->qd_slot % sdp->sd_qc_per_block;
 373
 374         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 375         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 376         if (error)
 377                 goto fail;
 378         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 379         if (error)
 380                 goto fail;
 381         error = -EIO;
 382         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 383                 goto fail_brelse;
 384
 385         qd->qd_bh = bh;
 386         qd->qd_bh_qc = (struct gfs2_quota_change *)
 387                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 388                  offset * sizeof(struct gfs2_quota_change));
 389
 390         mutex_unlock(&sdp->sd_quota_mutex);
 391
 392         return 0;
 393
 394 fail_brelse:
 395         brelse(bh);
 396 fail:
 397         qd->qd_bh_count--;
 398         mutex_unlock(&sdp->sd_quota_mutex);
 399         return error;
 400 }
 401
 402 static void bh_put(struct gfs2_quota_data *qd)
 403 {
 404         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 405
 406         mutex_lock(&sdp->sd_quota_mutex);
 407         gfs2_assert(sdp, qd->qd_bh_count);
 408         if (!--qd->qd_bh_count) {
 409                 brelse(qd->qd_bh);
 410                 qd->qd_bh = NULL;
 411                 qd->qd_bh_qc = NULL;
 412         }
 413         mutex_unlock(&sdp->sd_quota_mutex);
 414 }
 415
 416 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 417                          u64 *sync_gen)
 418 {
 419         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 420             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 421             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 422                 return 0;
 423
 424         if (!lockref_get_not_dead(&qd->qd_lockref))
 425                 return 0;
 426
 427         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 428         set_bit(QDF_LOCKED, &qd->qd_flags);
 429         qd->qd_change_sync = qd->qd_change;
 430         gfs2_assert_warn(sdp, qd->qd_slot_count);
 431         qd->qd_slot_count++;
 432         return 1;
 433 }
 434
 435 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 436 {
 437         struct gfs2_quota_data *qd = NULL;
 438         int error;
 439         int found = 0;
 440
 441         *qdp = NULL;
 442
 443         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 444                 return 0;
 445
 446         spin_lock(&qd_lock);
 447
 448         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 449                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
 450                 if (found)
 451                         break;
 452         }
 453
 454         if (!found)
 455                 qd = NULL;
 456
 457         spin_unlock(&qd_lock);
 458
 459         if (qd) {
 460                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 461                 error = bh_get(qd);
 462                 if (error) {
 463                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 464                         slot_put(qd);
 465                         qd_put(qd);
 466                         return error;
 467                 }
 468         }
 469
 470         *qdp = qd;
 471
 472         return 0;
 473 }
 474
 475 static void qd_unlock(struct gfs2_quota_data *qd)
 476 {
 477         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 478                          test_bit(QDF_LOCKED, &qd->qd_flags));
 479         clear_bit(QDF_LOCKED, &qd->qd_flags);
 480         bh_put(qd);
 481         slot_put(qd);
 482         qd_put(qd);
 483 }
 484
 485 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 486                     struct gfs2_quota_data **qdp)
 487 {
 488         int error;
 489
 490         error = qd_get(sdp, qid, qdp);
 491         if (error)
 492                 return error;
 493
 494         error = slot_get(*qdp);
 495         if (error)
 496                 goto fail;
 497
 498         error = bh_get(*qdp);
 499         if (error)
 500                 goto fail_slot;
 501
 502         return 0;
 503
 504 fail_slot:
 505         slot_put(*qdp);
 506 fail:
 507         qd_put(*qdp);
 508         return error;
 509 }
 510
 511 static void qdsb_put(struct gfs2_quota_data *qd)
 512 {
 513         bh_put(qd);
 514         slot_put(qd);
 515         qd_put(qd);
 516 }
 517
 518 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 519 {
 520         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 521         struct gfs2_quota_data **qd;
 522         int error;
 523
 524         if (ip->i_res == NULL) {
 525                 error = gfs2_rs_alloc(ip);
 526                 if (error)
 527                         return error;
 528         }
 529
 530         qd = ip->i_res->rs_qa_qd;
 531
 532         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 533             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 534                 return -EIO;
 535
 536         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 537                 return 0;
 538
 539         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 540         if (error)
 541                 goto out;
 542         ip->i_res->rs_qa_qd_num++;
 543         qd++;
 544
 545         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 546         if (error)
 547                 goto out;
 548         ip->i_res->rs_qa_qd_num++;
 549         qd++;
 550
 551         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 552             !uid_eq(uid, ip->i_inode.i_uid)) {
 553                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 554                 if (error)
 555                         goto out;
 556                 ip->i_res->rs_qa_qd_num++;
 557                 qd++;
 558         }
 559
 560         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 561             !gid_eq(gid, ip->i_inode.i_gid)) {
 562                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 563                 if (error)
 564                         goto out;
 565                 ip->i_res->rs_qa_qd_num++;
 566                 qd++;
 567         }
 568
 569 out:
 570         if (error)
 571                 gfs2_quota_unhold(ip);
 572         return error;
 573 }
 574
 575 void gfs2_quota_unhold(struct gfs2_inode *ip)
 576 {
 577         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 578         unsigned int x;
 579
 580         if (ip->i_res == NULL)
 581                 return;
 582         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 583
 584         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 585                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 586                 ip->i_res->rs_qa_qd[x] = NULL;
 587         }
 588         ip->i_res->rs_qa_qd_num = 0;
 589 }
 590
 591 static int sort_qd(const void *a, const void *b)
 592 {
 593         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 594         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 595
 596         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 597                 return -1;
 598         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 599                 return 1;
 600         return 0;
 601 }
 602
 603 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 604 {
 605         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 606         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 607         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 608         s64 x;
 609
 610         mutex_lock(&sdp->sd_quota_mutex);
 611         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 612
 613         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 614                 qc->qc_change = 0;
 615                 qc->qc_flags = 0;
 616                 if (qd->qd_id.type == USRQUOTA)
 617                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 618                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 619         }
 620
 621         x = be64_to_cpu(qc->qc_change) + change;
 622         qc->qc_change = cpu_to_be64(x);
 623
 624         spin_lock(&qd_lock);
 625         qd->qd_change = x;
 626         spin_unlock(&qd_lock);
 627
 628         if (!x) {
 629                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 630                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 631                 qc->qc_flags = 0;
 632                 qc->qc_id = 0;
 633                 slot_put(qd);
 634                 qd_put(qd);
 635         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 636                 qd_hold(qd);
 637                 slot_hold(qd);
 638         }
 639
 640         mutex_unlock(&sdp->sd_quota_mutex);
 641 }
 642
 643 /**
 644  * gfs2_adjust_quota - adjust record of current block usage
 645  * @ip: The quota inode
 646  * @loc: Offset of the entry in the quota file
 647  * @change: The amount of usage change to record
 648  * @qd: The quota data
 649  * @fdq: The updated limits to record
 650  *
 651  * This function was mostly borrowed from gfs2_block_truncate_page which was
 652  * in turn mostly borrowed from ext3
 653  *
 654  * Returns: 0 or -ve on error
 655  */
 656
 657 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 658                              s64 change, struct gfs2_quota_data *qd,
 659                              struct fs_disk_quota *fdq)
 660 {
 661         struct inode *inode = &ip->i_inode;
 662         struct gfs2_sbd *sdp = GFS2_SB(inode);
 663         struct address_space *mapping = inode->i_mapping;
 664         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 665         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 666         unsigned blocksize, iblock, pos;
 667         struct buffer_head *bh;
 668         struct page *page;
 669         void *kaddr, *ptr;
 670         struct gfs2_quota q;
 671         int err, nbytes;
 672         u64 size;
 673
 674         if (gfs2_is_stuffed(ip)) {
 675                 err = gfs2_unstuff_dinode(ip, NULL);
 676                 if (err)
 677                         return err;
 678         }
 679
 680         memset(&q, 0, sizeof(struct gfs2_quota));
 681         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 682         if (err < 0)
 683                 return err;
 684
 685         err = -EIO;
 686         be64_add_cpu(&q.qu_value, change);
 687         qd->qd_qb.qb_value = q.qu_value;
 688         if (fdq) {
 689                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 690                         q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 691                         qd->qd_qb.qb_warn = q.qu_warn;
 692                 }
 693                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 694                         q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 695                         qd->qd_qb.qb_limit = q.qu_limit;
 696                 }
 697                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 698                         q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 699                         qd->qd_qb.qb_value = q.qu_value;
 700                 }
 701         }
 702
 703         /* Write the quota into the quota file on disk */
 704         ptr = &q;
 705         nbytes = sizeof(struct gfs2_quota);
 706 get_a_page:
 707         page = find_or_create_page(mapping, index, GFP_NOFS);
 708         if (!page)
 709                 return -ENOMEM;
 710
 711         blocksize = inode->i_sb->s_blocksize;
 712         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 713
 714         if (!page_has_buffers(page))
 715                 create_empty_buffers(page, blocksize, 0);
 716
 717         bh = page_buffers(page);
 718         pos = blocksize;
 719         while (offset >= pos) {
 720                 bh = bh->b_this_page;
 721                 iblock++;
 722                 pos += blocksize;
 723         }
 724
 725         if (!buffer_mapped(bh)) {
 726                 gfs2_block_map(inode, iblock, bh, 1);
 727                 if (!buffer_mapped(bh))
 728                         goto unlock_out;
 729                 /* If it's a newly allocated disk block for quota, zero it */
 730                 if (buffer_new(bh))
 731                         zero_user(page, pos - blocksize, bh->b_size);
 732         }
 733
 734         if (PageUptodate(page))
 735                 set_buffer_uptodate(bh);
 736
 737         if (!buffer_uptodate(bh)) {
 738                 ll_rw_block(READ | REQ_META, 1, &bh);
 739                 wait_on_buffer(bh);
 740                 if (!buffer_uptodate(bh))
 741                         goto unlock_out;
 742         }
 743
 744         gfs2_trans_add_data(ip->i_gl, bh);
 745
 746         kaddr = kmap_atomic(page);
 747         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 748                 nbytes = PAGE_CACHE_SIZE - offset;
 749         memcpy(kaddr + offset, ptr, nbytes);
 750         flush_dcache_page(page);
 751         kunmap_atomic(kaddr);
 752         unlock_page(page);
 753         page_cache_release(page);
 754
 755         /* If quota straddles page boundary, we need to update the rest of the
 756          * quota at the beginning of the next page */
 757         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 758                 ptr = ptr + nbytes;
 759                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 760                 offset = 0;
 761                 index++;
 762                 goto get_a_page;
 763         }
 764
 765         size = loc + sizeof(struct gfs2_quota);
 766         if (size > inode->i_size)
 767                 i_size_write(inode, size);
 768         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 769         mark_inode_dirty(inode);
 770         return 0;
 771
 772 unlock_out:
 773         unlock_page(page);
 774         page_cache_release(page);
 775         return err;
 776 }
 777
 778 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 779 {
 780         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 781         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 782         struct gfs2_alloc_parms ap = { .aflags = 0, };
 783         unsigned int data_blocks, ind_blocks;
 784         struct gfs2_holder *ghs, i_gh;
 785         unsigned int qx, x;
 786         struct gfs2_quota_data *qd;
 787         unsigned reserved;
 788         loff_t offset;
 789         unsigned int nalloc = 0, blocks;
 790         int error;
 791
 792         error = gfs2_rs_alloc(ip);
 793         if (error)
 794                 return error;
 795
 796         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 797                               &data_blocks, &ind_blocks);
 798
 799         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 800         if (!ghs)
 801                 return -ENOMEM;
 802
 803         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 804         mutex_lock(&ip->i_inode.i_mutex);
 805         for (qx = 0; qx < num_qd; qx++) {
 806                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 807                                            GL_NOCACHE, &ghs[qx]);
 808                 if (error)
 809                         goto out;
 810         }
 811
 812         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 813         if (error)
 814                 goto out;
 815
 816         for (x = 0; x < num_qd; x++) {
 817                 offset = qd2offset(qda[x]);
 818                 if (gfs2_write_alloc_required(ip, offset,
 819                                               sizeof(struct gfs2_quota)))
 820                         nalloc++;
 821         }
 822
 823         /*
 824          * 1 blk for unstuffing inode if stuffed. We add this extra
 825          * block to the reservation unconditionally. If the inode
 826          * doesn't need unstuffing, the block will be released to the
 827          * rgrp since it won't be allocated during the transaction
 828          */
 829         /* +3 in the end for unstuffing block, inode size update block
 830          * and another block in case quota straddles page boundary and
 831          * two blocks need to be updated instead of 1 */
 832         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 833
 834         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 835         ap.target = reserved;
 836         error = gfs2_inplace_reserve(ip, &ap);
 837         if (error)
 838                 goto out_alloc;
 839
 840         if (nalloc)
 841                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 842
 843         error = gfs2_trans_begin(sdp, blocks, 0);
 844         if (error)
 845                 goto out_ipres;
 846
 847         for (x = 0; x < num_qd; x++) {
 848                 qd = qda[x];
 849                 offset = qd2offset(qd);
 850                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 851                 if (error)
 852                         goto out_end_trans;
 853
 854                 do_qc(qd, -qd->qd_change_sync);
 855                 set_bit(QDF_REFRESH, &qd->qd_flags);
 856         }
 857
 858         error = 0;
 859
 860 out_end_trans:
 861         gfs2_trans_end(sdp);
 862 out_ipres:
 863         gfs2_inplace_release(ip);
 864 out_alloc:
 865         gfs2_glock_dq_uninit(&i_gh);
 866 out:
 867         while (qx--)
 868                 gfs2_glock_dq_uninit(&ghs[qx]);
 869         mutex_unlock(&ip->i_inode.i_mutex);
 870         kfree(ghs);
 871         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 872         return error;
 873 }
 874
 875 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 876 {
 877         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 878         struct gfs2_quota q;
 879         struct gfs2_quota_lvb *qlvb;
 880         loff_t pos;
 881         int error;
 882
 883         memset(&q, 0, sizeof(struct gfs2_quota));
 884         pos = qd2offset(qd);
 885         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 886         if (error < 0)
 887                 return error;
 888
 889         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 890         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 891         qlvb->__pad = 0;
 892         qlvb->qb_limit = q.qu_limit;
 893         qlvb->qb_warn = q.qu_warn;
 894         qlvb->qb_value = q.qu_value;
 895         qd->qd_qb = *qlvb;
 896
 897         return 0;
 898 }
 899
 900 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 901                     struct gfs2_holder *q_gh)
 902 {
 903         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 904         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 905         struct gfs2_holder i_gh;
 906         int error;
 907
 908 restart:
 909         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 910         if (error)
 911                 return error;
 912
 913         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 914
 915         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 916                 gfs2_glock_dq_uninit(q_gh);
 917                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 918                                            GL_NOCACHE, q_gh);
 919                 if (error)
 920                         return error;
 921
 922                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 923                 if (error)
 924                         goto fail;
 925
 926                 error = update_qd(sdp, qd);
 927                 if (error)
 928                         goto fail_gunlock;
 929
 930                 gfs2_glock_dq_uninit(&i_gh);
 931                 gfs2_glock_dq_uninit(q_gh);
 932                 force_refresh = 0;
 933                 goto restart;
 934         }
 935
 936         return 0;
 937
 938 fail_gunlock:
 939         gfs2_glock_dq_uninit(&i_gh);
 940 fail:
 941         gfs2_glock_dq_uninit(q_gh);
 942         return error;
 943 }
 944
 945 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 946 {
 947         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 948         struct gfs2_quota_data *qd;
 949         unsigned int x;
 950         int error = 0;
 951
 952         error = gfs2_quota_hold(ip, uid, gid);
 953         if (error)
 954                 return error;
 955
 956         if (capable(CAP_SYS_RESOURCE) ||
 957             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 958                 return 0;
 959
 960         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 961              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 962
 963         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 964                 int force = NO_FORCE;
 965                 qd = ip->i_res->rs_qa_qd[x];
 966                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 967                         force = FORCE;
 968                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 969                 if (error)
 970                         break;
 971         }
 972
 973         if (!error)
 974                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 975         else {
 976                 while (x--)
 977                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 978                 gfs2_quota_unhold(ip);
 979         }
 980
 981         return error;
 982 }
 983
 984 static int need_sync(struct gfs2_quota_data *qd)
 985 {
 986         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 987         struct gfs2_tune *gt = &sdp->sd_tune;
 988         s64 value;
 989         unsigned int num, den;
 990         int do_sync = 1;
 991
 992         if (!qd->qd_qb.qb_limit)
 993                 return 0;
 994
 995         spin_lock(&qd_lock);
 996         value = qd->qd_change;
 997         spin_unlock(&qd_lock);
 998
 999         spin_lock(&gt->gt_spin);
1000         num = gt->gt_quota_scale_num;
1001         den = gt->gt_quota_scale_den;
1002         spin_unlock(&gt->gt_spin);
1003
1004         if (value < 0)
1005                 do_sync = 0;
1006         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1007                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1008                 do_sync = 0;
1009         else {
1010                 value *= gfs2_jindex_size(sdp) * num;
1011                 value = div_s64(value, den);
1012                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1013                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1014                         do_sync = 0;
1015         }
1016
1017         return do_sync;
1018 }
1019
1020 void gfs2_quota_unlock(struct gfs2_inode *ip)
1021 {
1022         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1023         struct gfs2_quota_data *qda[4];
1024         unsigned int count = 0;
1025         unsigned int x;
1026         int found;
1027
1028         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1029                 goto out;
1030
1031         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1032                 struct gfs2_quota_data *qd;
1033                 int sync;
1034
1035                 qd = ip->i_res->rs_qa_qd[x];
1036                 sync = need_sync(qd);
1037
1038                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1039                 if (!sync)
1040                         continue;
1041
1042                 spin_lock(&qd_lock);
1043                 found = qd_check_sync(sdp, qd, NULL);
1044                 spin_unlock(&qd_lock);
1045
1046                 if (!found)
1047                         continue;
1048
1049                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1050                 if (bh_get(qd)) {
1051                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1052                         slot_put(qd);
1053                         qd_put(qd);
1054                         continue;
1055                 }
1056
1057                 qda[count++] = qd;
1058         }
1059
1060         if (count) {
1061                 do_sync(count, qda);
1062                 for (x = 0; x < count; x++)
1063                         qd_unlock(qda[x]);
1064         }
1065
1066 out:
1067         gfs2_quota_unhold(ip);
1068 }
1069
1070 #define MAX_LINE 256
1071
1072 static int print_message(struct gfs2_quota_data *qd, char *type)
1073 {
1074         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1075
1076         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1077                sdp->sd_fsname, type,
1078                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1079                from_kqid(&init_user_ns, qd->qd_id));
1080
1081         return 0;
1082 }
1083
1084 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1085 {
1086         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1087         struct gfs2_quota_data *qd;
1088         s64 value;
1089         unsigned int x;
1090         int error = 0;
1091
1092         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1093                 return 0;
1094
1095         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1096                 return 0;
1097
1098         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1099                 qd = ip->i_res->rs_qa_qd[x];
1100
1101                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1102                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1103                         continue;
1104
1105                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1106                 spin_lock(&qd_lock);
1107                 value += qd->qd_change;
1108                 spin_unlock(&qd_lock);
1109
1110                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1111                         print_message(qd, "exceeded");
1112                         quota_send_warning(qd->qd_id,
1113                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1114
1115                         error = -EDQUOT;
1116                         break;
1117                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1118                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1119                            time_after_eq(jiffies, qd->qd_last_warn +
1120                                          gfs2_tune_get(sdp,
1121                                                 gt_quota_warn_period) * HZ)) {
1122                         quota_send_warning(qd->qd_id,
1123                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1124                         error = print_message(qd, "warning");
1125                         qd->qd_last_warn = jiffies;
1126                 }
1127         }
1128
1129         return error;
1130 }
1131
1132 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1133                        kuid_t uid, kgid_t gid)
1134 {
1135         struct gfs2_quota_data *qd;
1136         unsigned int x;
1137
1138         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1139                 return;
1140         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1141                 return;
1142
1143         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1144                 qd = ip->i_res->rs_qa_qd[x];
1145
1146                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1147                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1148                         do_qc(qd, change);
1149                 }
1150         }
1151 }
1152
1153 int gfs2_quota_sync(struct super_block *sb, int type)
1154 {
1155         struct gfs2_sbd *sdp = sb->s_fs_info;
1156         struct gfs2_quota_data **qda;
1157         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1158         unsigned int num_qd;
1159         unsigned int x;
1160         int error = 0;
1161
1162         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1163         if (!qda)
1164                 return -ENOMEM;
1165
1166         mutex_lock(&sdp->sd_quota_sync_mutex);
1167         sdp->sd_quota_sync_gen++;
1168
1169         do {
1170                 num_qd = 0;
1171
1172                 for (;;) {
1173                         error = qd_fish(sdp, qda + num_qd);
1174                         if (error || !qda[num_qd])
1175                                 break;
1176                         if (++num_qd == max_qd)
1177                                 break;
1178                 }
1179
1180                 if (num_qd) {
1181                         if (!error)
1182                                 error = do_sync(num_qd, qda);
1183                         if (!error)
1184                                 for (x = 0; x < num_qd; x++)
1185                                         qda[x]->qd_sync_gen =
1186                                                 sdp->sd_quota_sync_gen;
1187
1188                         for (x = 0; x < num_qd; x++)
1189                                 qd_unlock(qda[x]);
1190                 }
1191         } while (!error && num_qd == max_qd);
1192
1193         mutex_unlock(&sdp->sd_quota_sync_mutex);
1194         kfree(qda);
1195
1196         return error;
1197 }
1198
1199 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1200 {
1201         struct gfs2_quota_data *qd;
1202         struct gfs2_holder q_gh;
1203         int error;
1204
1205         error = qd_get(sdp, qid, &qd);
1206         if (error)
1207                 return error;
1208
1209         error = do_glock(qd, FORCE, &q_gh);
1210         if (!error)
1211                 gfs2_glock_dq_uninit(&q_gh);
1212
1213         qd_put(qd);
1214         return error;
1215 }
1216
1217 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1218 {
1219         const struct gfs2_quota_change *str = buf;
1220
1221         qc->qc_change = be64_to_cpu(str->qc_change);
1222         qc->qc_flags = be32_to_cpu(str->qc_flags);
1223         qc->qc_id = make_kqid(&init_user_ns,
1224                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1225                               be32_to_cpu(str->qc_id));
1226 }
1227
1228 int gfs2_quota_init(struct gfs2_sbd *sdp)
1229 {
1230         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1231         u64 size = i_size_read(sdp->sd_qc_inode);
1232         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1233         unsigned int x, slot = 0;
1234         unsigned int found = 0;
1235         u64 dblock;
1236         u32 extlen = 0;
1237         int error;
1238
1239         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1240                 return -EIO;
1241
1242         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1243         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1244
1245         error = -ENOMEM;
1246
1247         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1248                                        sizeof(unsigned char *), GFP_NOFS);
1249         if (!sdp->sd_quota_bitmap)
1250                 return error;
1251
1252         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1253                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1254                 if (!sdp->sd_quota_bitmap[x])
1255                         goto fail;
1256         }
1257
1258         for (x = 0; x < blocks; x++) {
1259                 struct buffer_head *bh;
1260                 unsigned int y;
1261
1262                 if (!extlen) {
1263                         int new = 0;
1264                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1265                         if (error)
1266                                 goto fail;
1267                 }
1268                 error = -EIO;
1269                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1270                 if (!bh)
1271                         goto fail;
1272                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1273                         brelse(bh);
1274                         goto fail;
1275                 }
1276
1277                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1278                      y++, slot++) {
1279                         struct gfs2_quota_change_host qc;
1280                         struct gfs2_quota_data *qd;
1281
1282                         gfs2_quota_change_in(&qc, bh->b_data +
1283                                           sizeof(struct gfs2_meta_header) +
1284                                           y * sizeof(struct gfs2_quota_change));
1285                         if (!qc.qc_change)
1286                                 continue;
1287
1288                         error = qd_alloc(sdp, qc.qc_id, &qd);
1289                         if (error) {
1290                                 brelse(bh);
1291                                 goto fail;
1292                         }
1293
1294                         set_bit(QDF_CHANGE, &qd->qd_flags);
1295                         qd->qd_change = qc.qc_change;
1296                         qd->qd_slot = slot;
1297                         qd->qd_slot_count = 1;
1298
1299                         spin_lock(&qd_lock);
1300                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1301                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1302                         atomic_inc(&sdp->sd_quota_count);
1303                         spin_unlock(&qd_lock);
1304
1305                         found++;
1306                 }
1307
1308                 brelse(bh);
1309                 dblock++;
1310                 extlen--;
1311         }
1312
1313         if (found)
1314                 fs_info(sdp, "found %u quota changes\n", found);
1315
1316         return 0;
1317
1318 fail:
1319         gfs2_quota_cleanup(sdp);
1320         return error;
1321 }
1322
1323 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1324 {
1325         struct list_head *head = &sdp->sd_quota_list;
1326         struct gfs2_quota_data *qd;
1327         unsigned int x;
1328
1329         spin_lock(&qd_lock);
1330         while (!list_empty(head)) {
1331                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1332
1333                 /*
1334                  * To be removed in due course... we should be able to
1335                  * ensure that all refs to the qd have done by this point
1336                  * so that this rather odd test is not required
1337                  */
1338                 spin_lock(&qd->qd_lockref.lock);
1339                 if (qd->qd_lockref.count > 1 ||
1340                     (qd->qd_lockref.count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1341                         spin_unlock(&qd->qd_lockref.lock);
1342                         list_move(&qd->qd_list, head);
1343                         spin_unlock(&qd_lock);
1344                         schedule();
1345                         spin_lock(&qd_lock);
1346                         continue;
1347                 }
1348                 spin_unlock(&qd->qd_lockref.lock);
1349
1350                 list_del(&qd->qd_list);
1351                 /* Also remove if this qd exists in the reclaim list */
1352                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1353                 atomic_dec(&sdp->sd_quota_count);
1354                 spin_unlock(&qd_lock);
1355
1356                 if (!qd->qd_lockref.count) {
1357                         gfs2_assert_warn(sdp, !qd->qd_change);
1358                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1359                 } else
1360                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1361                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1362
1363                 gfs2_glock_put(qd->qd_gl);
1364                 kmem_cache_free(gfs2_quotad_cachep, qd);
1365
1366                 spin_lock(&qd_lock);
1367         }
1368         spin_unlock(&qd_lock);
1369
1370         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1371
1372         if (sdp->sd_quota_bitmap) {
1373                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1374                         kfree(sdp->sd_quota_bitmap[x]);
1375                 kfree(sdp->sd_quota_bitmap);
1376         }
1377 }
1378
1379 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1380 {
1381         if (error == 0 || error == -EROFS)
1382                 return;
1383         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1384                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1385 }
1386
1387 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1388                                int (*fxn)(struct super_block *sb, int type),
1389                                unsigned long t, unsigned long *timeo,
1390                                unsigned int *new_timeo)
1391 {
1392         if (t >= *timeo) {
1393                 int error = fxn(sdp->sd_vfs, 0);
1394                 quotad_error(sdp, msg, error);
1395                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1396         } else {
1397                 *timeo -= t;
1398         }
1399 }
1400
1401 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1402 {
1403         struct gfs2_inode *ip;
1404
1405         while(1) {
1406                 ip = NULL;
1407                 spin_lock(&sdp->sd_trunc_lock);
1408                 if (!list_empty(&sdp->sd_trunc_list)) {
1409                         ip = list_entry(sdp->sd_trunc_list.next,
1410                                         struct gfs2_inode, i_trunc_list);
1411                         list_del_init(&ip->i_trunc_list);
1412                 }
1413                 spin_unlock(&sdp->sd_trunc_lock);
1414                 if (ip == NULL)
1415                         return;
1416                 gfs2_glock_finish_truncate(ip);
1417         }
1418 }
1419
1420 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1421         if (!sdp->sd_statfs_force_sync) {
1422                 sdp->sd_statfs_force_sync = 1;
1423                 wake_up(&sdp->sd_quota_wait);
1424         }
1425 }
1426
1427
1428 /**
1429  * gfs2_quotad - Write cached quota changes into the quota file
1430  * @sdp: Pointer to GFS2 superblock
1431  *
1432  */
1433
1434 int gfs2_quotad(void *data)
1435 {
1436         struct gfs2_sbd *sdp = data;
1437         struct gfs2_tune *tune = &sdp->sd_tune;
1438         unsigned long statfs_timeo = 0;
1439         unsigned long quotad_timeo = 0;
1440         unsigned long t = 0;
1441         DEFINE_WAIT(wait);
1442         int empty;
1443
1444         while (!kthread_should_stop()) {
1445
1446                 /* Update the master statfs file */
1447                 if (sdp->sd_statfs_force_sync) {
1448                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1449                         quotad_error(sdp, "statfs", error);
1450                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1451                 }
1452                 else
1453                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1454                                            &statfs_timeo,
1455                                            &tune->gt_statfs_quantum);
1456
1457                 /* Update quota file */
1458                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1459                                    &quotad_timeo, &tune->gt_quota_quantum);
1460
1461                 /* Check for & recover partially truncated inodes */
1462                 quotad_check_trunc_list(sdp);
1463
1464                 try_to_freeze();
1465
1466                 t = min(quotad_timeo, statfs_timeo);
1467
1468                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1469                 spin_lock(&sdp->sd_trunc_lock);
1470                 empty = list_empty(&sdp->sd_trunc_list);
1471                 spin_unlock(&sdp->sd_trunc_lock);
1472                 if (empty && !sdp->sd_statfs_force_sync)
1473                         t -= schedule_timeout(t);
1474                 else
1475                         t = 0;
1476                 finish_wait(&sdp->sd_quota_wait, &wait);
1477         }
1478
1479         return 0;
1480 }
1481
1482 static int gfs2_quota_get_xstate(struct super_block *sb,
1483                                  struct fs_quota_stat *fqs)
1484 {
1485         struct gfs2_sbd *sdp = sb->s_fs_info;
1486
1487         memset(fqs, 0, sizeof(struct fs_quota_stat));
1488         fqs->qs_version = FS_QSTAT_VERSION;
1489
1490         switch (sdp->sd_args.ar_quota) {
1491         case GFS2_QUOTA_ON:
1492                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1493                 /*FALLTHRU*/
1494         case GFS2_QUOTA_ACCOUNT:
1495                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1496                 break;
1497         case GFS2_QUOTA_OFF:
1498                 break;
1499         }
1500
1501         if (sdp->sd_quota_inode) {
1502                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1503                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1504         }
1505         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1506         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1507         fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1508         return 0;
1509 }
1510
1511 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1512                           struct fs_disk_quota *fdq)
1513 {
1514         struct gfs2_sbd *sdp = sb->s_fs_info;
1515         struct gfs2_quota_lvb *qlvb;
1516         struct gfs2_quota_data *qd;
1517         struct gfs2_holder q_gh;
1518         int error;
1519
1520         memset(fdq, 0, sizeof(struct fs_disk_quota));
1521
1522         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1523                 return -ESRCH; /* Crazy XFS error code */
1524
1525         if ((qid.type != USRQUOTA) &&
1526             (qid.type != GRPQUOTA))
1527                 return -EINVAL;
1528
1529         error = qd_get(sdp, qid, &qd);
1530         if (error)
1531                 return error;
1532         error = do_glock(qd, FORCE, &q_gh);
1533         if (error)
1534                 goto out;
1535
1536         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1537         fdq->d_version = FS_DQUOT_VERSION;
1538         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1539         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1540         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1541         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1542         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1543
1544         gfs2_glock_dq_uninit(&q_gh);
1545 out:
1546         qd_put(qd);
1547         return error;
1548 }
1549
1550 /* GFS2 only supports a subset of the XFS fields */
1551 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1552
1553 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1554                           struct fs_disk_quota *fdq)
1555 {
1556         struct gfs2_sbd *sdp = sb->s_fs_info;
1557         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1558         struct gfs2_quota_data *qd;
1559         struct gfs2_holder q_gh, i_gh;
1560         unsigned int data_blocks, ind_blocks;
1561         unsigned int blocks = 0;
1562         int alloc_required;
1563         loff_t offset;
1564         int error;
1565
1566         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1567                 return -ESRCH; /* Crazy XFS error code */
1568
1569         if ((qid.type != USRQUOTA) &&
1570             (qid.type != GRPQUOTA))
1571                 return -EINVAL;
1572
1573         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1574                 return -EINVAL;
1575
1576         error = qd_get(sdp, qid, &qd);
1577         if (error)
1578                 return error;
1579
1580         error = gfs2_rs_alloc(ip);
1581         if (error)
1582                 goto out_put;
1583
1584         mutex_lock(&ip->i_inode.i_mutex);
1585         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1586         if (error)
1587                 goto out_unlockput;
1588         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1589         if (error)
1590                 goto out_q;
1591
1592         /* Check for existing entry, if none then alloc new blocks */
1593         error = update_qd(sdp, qd);
1594         if (error)
1595                 goto out_i;
1596
1597         /* If nothing has changed, this is a no-op */
1598         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1599             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1600                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1601
1602         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1603             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1604                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1605
1606         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1607             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1608                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1609
1610         if (fdq->d_fieldmask == 0)
1611                 goto out_i;
1612
1613         offset = qd2offset(qd);
1614         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1615         if (gfs2_is_stuffed(ip))
1616                 alloc_required = 1;
1617         if (alloc_required) {
1618                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1619                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1620                                        &data_blocks, &ind_blocks);
1621                 blocks = 1 + data_blocks + ind_blocks;
1622                 ap.target = blocks;
1623                 error = gfs2_inplace_reserve(ip, &ap);
1624                 if (error)
1625                         goto out_i;
1626                 blocks += gfs2_rg_blocks(ip, blocks);
1627         }
1628
1629         /* Some quotas span block boundaries and can update two blocks,
1630            adding an extra block to the transaction to handle such quotas */
1631         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1632         if (error)
1633                 goto out_release;
1634
1635         /* Apply changes */
1636         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1637
1638         gfs2_trans_end(sdp);
1639 out_release:
1640         if (alloc_required)
1641                 gfs2_inplace_release(ip);
1642 out_i:
1643         gfs2_glock_dq_uninit(&i_gh);
1644 out_q:
1645         gfs2_glock_dq_uninit(&q_gh);
1646 out_unlockput:
1647         mutex_unlock(&ip->i_inode.i_mutex);
1648 out_put:
1649         qd_put(qd);
1650         return error;
1651 }
1652
1653 const struct quotactl_ops gfs2_quotactl_ops = {
1654         .quota_sync     = gfs2_quota_sync,
1655         .get_xstate     = gfs2_quota_get_xstate,
1656         .get_dqblk      = gfs2_get_dqblk,
1657         .set_dqblk      = gfs2_set_dqblk,
1658 };