fs/gfs2/quota.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 /*
   8  * Quota change tags are associated with each transaction that allocates or
   9  * deallocates space.  Those changes are accumulated locally to each node (in a
  10  * per-node file) and then are periodically synced to the quota file.  This
  11  * avoids the bottleneck of constantly touching the quota file, but introduces
  12  * fuzziness in the current usage value of IDs that are being used on different
  13  * nodes in the cluster simultaneously.  So, it is possible for a user on
  14  * multiple nodes to overrun their quota, but that overrun is controlable.
  15  * Since quota tags are part of transactions, there is no need for a quota check
  16  * program to be run on node crashes or anything like that.
  17  *
  18  * There are couple of knobs that let the administrator manage the quota
  19  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  20  * sitting on one node before being synced to the quota file.  (The default is
  21  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  22  * of quota file syncs increases as the user moves closer to their limit.  The
  23  * more frequent the syncs, the more accurate the quota enforcement, but that
  24  * means that there is more contention between the nodes for the quota file.
  25  * The default value is one.  This sets the maximum theoretical quota overrun
  26  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  27  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  28  * number greater than one makes quota syncs more frequent and reduces the
  29  * maximum overrun.  Numbers less than one (but greater than zero) make quota
  30  * syncs less frequent.
  31  *
  32  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  33  * the quota file, so it is not being constantly read.
  34  */
  35
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37
  38 #include <linux/sched.h>
  39 #include <linux/slab.h>
  40 #include <linux/mm.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/completion.h>
  43 #include <linux/buffer_head.h>
  44 #include <linux/sort.h>
  45 #include <linux/fs.h>
  46 #include <linux/bio.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <linux/kthread.h>
  49 #include <linux/freezer.h>
  50 #include <linux/quota.h>
  51 #include <linux/dqblk_xfs.h>
  52 #include <linux/lockref.h>
  53 #include <linux/list_lru.h>
  54 #include <linux/rcupdate.h>
  55 #include <linux/rculist_bl.h>
  56 #include <linux/bit_spinlock.h>
  57 #include <linux/jhash.h>
  58 #include <linux/vmalloc.h>
  59
  60 #include "gfs2.h"
  61 #include "incore.h"
  62 #include "bmap.h"
  63 #include "glock.h"
  64 #include "glops.h"
  65 #include "log.h"
  66 #include "meta_io.h"
  67 #include "quota.h"
  68 #include "rgrp.h"
  69 #include "super.h"
  70 #include "trans.h"
  71 #include "inode.h"
  72 #include "util.h"
  73
  74 #define GFS2_QD_HASH_SHIFT      12
  75 #define GFS2_QD_HASH_SIZE       BIT(GFS2_QD_HASH_SHIFT)
  76 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
  77
  78 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
  79 /*                     -> sd_bitmap_lock                              */
  80 static DEFINE_SPINLOCK(qd_lock);
  81 struct list_lru gfs2_qd_lru;
  82
  83 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
  84
  85 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
  86                                  const struct kqid qid)
  87 {
  88         unsigned int h;
  89
  90         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
  91         h = jhash(&qid, sizeof(struct kqid), h);
  92
  93         return h & GFS2_QD_HASH_MASK;
  94 }
  95
  96 static inline void spin_lock_bucket(unsigned int hash)
  97 {
  98         hlist_bl_lock(&qd_hash_table[hash]);
  99 }
 100
 101 static inline void spin_unlock_bucket(unsigned int hash)
 102 {
 103         hlist_bl_unlock(&qd_hash_table[hash]);
 104 }
 105
 106 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 107 {
 108         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
 109         kmem_cache_free(gfs2_quotad_cachep, qd);
 110 }
 111
 112 static void gfs2_qd_dispose(struct list_head *list)
 113 {
 114         struct gfs2_quota_data *qd;
 115         struct gfs2_sbd *sdp;
 116
 117         while (!list_empty(list)) {
 118                 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
 119                 sdp = qd->qd_gl->gl_name.ln_sbd;
 120
 121                 list_del(&qd->qd_lru);
 122
 123                 /* Free from the filesystem-specific list */
 124                 spin_lock(&qd_lock);
 125                 list_del(&qd->qd_list);
 126                 spin_unlock(&qd_lock);
 127
 128                 spin_lock_bucket(qd->qd_hash);
 129                 hlist_bl_del_rcu(&qd->qd_hlist);
 130                 spin_unlock_bucket(qd->qd_hash);
 131
 132                 gfs2_assert_warn(sdp, !qd->qd_change);
 133                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 134                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 135
 136                 gfs2_glock_put(qd->qd_gl);
 137                 atomic_dec(&sdp->sd_quota_count);
 138
 139                 /* Delete it from the common reclaim list */
 140                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 141         }
 142 }
 143
 144
 145 static enum lru_status gfs2_qd_isolate(struct list_head *item,
 146                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
 147 {
 148         struct list_head *dispose = arg;
 149         struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
 150
 151         if (!spin_trylock(&qd->qd_lockref.lock))
 152                 return LRU_SKIP;
 153
 154         if (qd->qd_lockref.count == 0) {
 155                 lockref_mark_dead(&qd->qd_lockref);
 156                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
 157         }
 158
 159         spin_unlock(&qd->qd_lockref.lock);
 160         return LRU_REMOVED;
 161 }
 162
 163 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 164                                          struct shrink_control *sc)
 165 {
 166         LIST_HEAD(dispose);
 167         unsigned long freed;
 168
 169         if (!(sc->gfp_mask & __GFP_FS))
 170                 return SHRINK_STOP;
 171
 172         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 173                                      gfs2_qd_isolate, &dispose);
 174
 175         gfs2_qd_dispose(&dispose);
 176
 177         return freed;
 178 }
 179
 180 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 181                                           struct shrink_control *sc)
 182 {
 183         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 184 }
 185
 186 struct shrinker gfs2_qd_shrinker = {
 187         .count_objects = gfs2_qd_shrink_count,
 188         .scan_objects = gfs2_qd_shrink_scan,
 189         .seeks = DEFAULT_SEEKS,
 190         .flags = SHRINKER_NUMA_AWARE,
 191 };
 192
 193
 194 static u64 qd2index(struct gfs2_quota_data *qd)
 195 {
 196         struct kqid qid = qd->qd_id;
 197         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 198                 ((qid.type == USRQUOTA) ? 0 : 1);
 199 }
 200
 201 static u64 qd2offset(struct gfs2_quota_data *qd)
 202 {
 203         u64 offset;
 204
 205         offset = qd2index(qd);
 206         offset *= sizeof(struct gfs2_quota);
 207
 208         return offset;
 209 }
 210
 211 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 212 {
 213         struct gfs2_quota_data *qd;
 214         int error;
 215
 216         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 217         if (!qd)
 218                 return NULL;
 219
 220         qd->qd_sbd = sdp;
 221         qd->qd_lockref.count = 1;
 222         spin_lock_init(&qd->qd_lockref.lock);
 223         qd->qd_id = qid;
 224         qd->qd_slot = -1;
 225         INIT_LIST_HEAD(&qd->qd_lru);
 226         qd->qd_hash = hash;
 227
 228         error = gfs2_glock_get(sdp, qd2index(qd),
 229                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 230         if (error)
 231                 goto fail;
 232
 233         return qd;
 234
 235 fail:
 236         kmem_cache_free(gfs2_quotad_cachep, qd);
 237         return NULL;
 238 }
 239
 240 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 241                                                      const struct gfs2_sbd *sdp,
 242                                                      struct kqid qid)
 243 {
 244         struct gfs2_quota_data *qd;
 245         struct hlist_bl_node *h;
 246
 247         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 248                 if (!qid_eq(qd->qd_id, qid))
 249                         continue;
 250                 if (qd->qd_sbd != sdp)
 251                         continue;
 252                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 253                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 254                         return qd;
 255                 }
 256         }
 257
 258         return NULL;
 259 }
 260
 261
 262 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 263                   struct gfs2_quota_data **qdp)
 264 {
 265         struct gfs2_quota_data *qd, *new_qd;
 266         unsigned int hash = gfs2_qd_hash(sdp, qid);
 267
 268         rcu_read_lock();
 269         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 270         rcu_read_unlock();
 271
 272         if (qd)
 273                 return 0;
 274
 275         new_qd = qd_alloc(hash, sdp, qid);
 276         if (!new_qd)
 277                 return -ENOMEM;
 278
 279         spin_lock(&qd_lock);
 280         spin_lock_bucket(hash);
 281         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 282         if (qd == NULL) {
 283                 *qdp = new_qd;
 284                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 285                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 286                 atomic_inc(&sdp->sd_quota_count);
 287         }
 288         spin_unlock_bucket(hash);
 289         spin_unlock(&qd_lock);
 290
 291         if (qd) {
 292                 gfs2_glock_put(new_qd->qd_gl);
 293                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 294         }
 295
 296         return 0;
 297 }
 298
 299
 300 static void qd_hold(struct gfs2_quota_data *qd)
 301 {
 302         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 303         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 304         lockref_get(&qd->qd_lockref);
 305 }
 306
 307 static void qd_put(struct gfs2_quota_data *qd)
 308 {
 309         if (lockref_put_or_lock(&qd->qd_lockref))
 310                 return;
 311
 312         qd->qd_lockref.count = 0;
 313         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 314         spin_unlock(&qd->qd_lockref.lock);
 315
 316 }
 317
 318 static int slot_get(struct gfs2_quota_data *qd)
 319 {
 320         struct gfs2_sbd *sdp = qd->qd_sbd;
 321         unsigned int bit;
 322         int error = 0;
 323
 324         spin_lock(&sdp->sd_bitmap_lock);
 325         if (qd->qd_slot_count != 0)
 326                 goto out;
 327
 328         error = -ENOSPC;
 329         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
 330         if (bit < sdp->sd_quota_slots) {
 331                 set_bit(bit, sdp->sd_quota_bitmap);
 332                 qd->qd_slot = bit;
 333                 error = 0;
 334 out:
 335                 qd->qd_slot_count++;
 336         }
 337         spin_unlock(&sdp->sd_bitmap_lock);
 338
 339         return error;
 340 }
 341
 342 static void slot_hold(struct gfs2_quota_data *qd)
 343 {
 344         struct gfs2_sbd *sdp = qd->qd_sbd;
 345
 346         spin_lock(&sdp->sd_bitmap_lock);
 347         gfs2_assert(sdp, qd->qd_slot_count);
 348         qd->qd_slot_count++;
 349         spin_unlock(&sdp->sd_bitmap_lock);
 350 }
 351
 352 static void slot_put(struct gfs2_quota_data *qd)
 353 {
 354         struct gfs2_sbd *sdp = qd->qd_sbd;
 355
 356         spin_lock(&sdp->sd_bitmap_lock);
 357         gfs2_assert(sdp, qd->qd_slot_count);
 358         if (!--qd->qd_slot_count) {
 359                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 360                 qd->qd_slot = -1;
 361         }
 362         spin_unlock(&sdp->sd_bitmap_lock);
 363 }
 364
 365 static int bh_get(struct gfs2_quota_data *qd)
 366 {
 367         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 368         struct inode *inode = sdp->sd_qc_inode;
 369         struct gfs2_inode *ip = GFS2_I(inode);
 370         unsigned int block, offset;
 371         struct buffer_head *bh;
 372         struct iomap iomap = { };
 373         int error;
 374
 375         mutex_lock(&sdp->sd_quota_mutex);
 376
 377         if (qd->qd_bh_count++) {
 378                 mutex_unlock(&sdp->sd_quota_mutex);
 379                 return 0;
 380         }
 381
 382         block = qd->qd_slot / sdp->sd_qc_per_block;
 383         offset = qd->qd_slot % sdp->sd_qc_per_block;
 384
 385         error = gfs2_iomap_get(inode,
 386                                (loff_t)block << inode->i_blkbits,
 387                                i_blocksize(inode), &iomap);
 388         if (error)
 389                 goto fail;
 390         error = -ENOENT;
 391         if (iomap.type != IOMAP_MAPPED)
 392                 goto fail;
 393
 394         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
 395                                DIO_WAIT, 0, &bh);
 396         if (error)
 397                 goto fail;
 398         error = -EIO;
 399         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 400                 goto fail_brelse;
 401
 402         qd->qd_bh = bh;
 403         qd->qd_bh_qc = (struct gfs2_quota_change *)
 404                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 405                  offset * sizeof(struct gfs2_quota_change));
 406
 407         mutex_unlock(&sdp->sd_quota_mutex);
 408
 409         return 0;
 410
 411 fail_brelse:
 412         brelse(bh);
 413 fail:
 414         qd->qd_bh_count--;
 415         mutex_unlock(&sdp->sd_quota_mutex);
 416         return error;
 417 }
 418
 419 static void bh_put(struct gfs2_quota_data *qd)
 420 {
 421         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 422
 423         mutex_lock(&sdp->sd_quota_mutex);
 424         gfs2_assert(sdp, qd->qd_bh_count);
 425         if (!--qd->qd_bh_count) {
 426                 brelse(qd->qd_bh);
 427                 qd->qd_bh = NULL;
 428                 qd->qd_bh_qc = NULL;
 429         }
 430         mutex_unlock(&sdp->sd_quota_mutex);
 431 }
 432
 433 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 434                          u64 *sync_gen)
 435 {
 436         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 437             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 438             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 439                 return 0;
 440
 441         if (!lockref_get_not_dead(&qd->qd_lockref))
 442                 return 0;
 443
 444         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 445         set_bit(QDF_LOCKED, &qd->qd_flags);
 446         qd->qd_change_sync = qd->qd_change;
 447         slot_hold(qd);
 448         return 1;
 449 }
 450
 451 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 452 {
 453         struct gfs2_quota_data *qd = NULL, *iter;
 454         int error;
 455
 456         *qdp = NULL;
 457
 458         if (sb_rdonly(sdp->sd_vfs))
 459                 return 0;
 460
 461         spin_lock(&qd_lock);
 462
 463         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 464                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 465                         qd = iter;
 466                         break;
 467                 }
 468         }
 469
 470         spin_unlock(&qd_lock);
 471
 472         if (qd) {
 473                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 474                 error = bh_get(qd);
 475                 if (error) {
 476                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 477                         slot_put(qd);
 478                         qd_put(qd);
 479                         return error;
 480                 }
 481         }
 482
 483         *qdp = qd;
 484
 485         return 0;
 486 }
 487
 488 static void qd_unlock(struct gfs2_quota_data *qd)
 489 {
 490         gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
 491                          test_bit(QDF_LOCKED, &qd->qd_flags));
 492         clear_bit(QDF_LOCKED, &qd->qd_flags);
 493         bh_put(qd);
 494         slot_put(qd);
 495         qd_put(qd);
 496 }
 497
 498 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 499                     struct gfs2_quota_data **qdp)
 500 {
 501         int error;
 502
 503         error = qd_get(sdp, qid, qdp);
 504         if (error)
 505                 return error;
 506
 507         error = slot_get(*qdp);
 508         if (error)
 509                 goto fail;
 510
 511         error = bh_get(*qdp);
 512         if (error)
 513                 goto fail_slot;
 514
 515         return 0;
 516
 517 fail_slot:
 518         slot_put(*qdp);
 519 fail:
 520         qd_put(*qdp);
 521         return error;
 522 }
 523
 524 static void qdsb_put(struct gfs2_quota_data *qd)
 525 {
 526         bh_put(qd);
 527         slot_put(qd);
 528         qd_put(qd);
 529 }
 530
 531 /**
 532  * gfs2_qa_get - make sure we have a quota allocations data structure,
 533  *               if necessary
 534  * @ip: the inode for this reservation
 535  */
 536 int gfs2_qa_get(struct gfs2_inode *ip)
 537 {
 538         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 539         struct inode *inode = &ip->i_inode;
 540
 541         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 542                 return 0;
 543
 544         spin_lock(&inode->i_lock);
 545         if (ip->i_qadata == NULL) {
 546                 struct gfs2_qadata *tmp;
 547
 548                 spin_unlock(&inode->i_lock);
 549                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 550                 if (!tmp)
 551                         return -ENOMEM;
 552
 553                 spin_lock(&inode->i_lock);
 554                 if (ip->i_qadata == NULL)
 555                         ip->i_qadata = tmp;
 556                 else
 557                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 558         }
 559         ip->i_qadata->qa_ref++;
 560         spin_unlock(&inode->i_lock);
 561         return 0;
 562 }
 563
 564 void gfs2_qa_put(struct gfs2_inode *ip)
 565 {
 566         struct inode *inode = &ip->i_inode;
 567
 568         spin_lock(&inode->i_lock);
 569         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 570                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 571                 ip->i_qadata = NULL;
 572         }
 573         spin_unlock(&inode->i_lock);
 574 }
 575
 576 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 577 {
 578         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 579         struct gfs2_quota_data **qd;
 580         int error;
 581
 582         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 583                 return 0;
 584
 585         error = gfs2_qa_get(ip);
 586         if (error)
 587                 return error;
 588
 589         qd = ip->i_qadata->qa_qd;
 590
 591         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 592             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 593                 error = -EIO;
 594                 goto out;
 595         }
 596
 597         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 598         if (error)
 599                 goto out_unhold;
 600         ip->i_qadata->qa_qd_num++;
 601         qd++;
 602
 603         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 604         if (error)
 605                 goto out_unhold;
 606         ip->i_qadata->qa_qd_num++;
 607         qd++;
 608
 609         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 610             !uid_eq(uid, ip->i_inode.i_uid)) {
 611                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 612                 if (error)
 613                         goto out_unhold;
 614                 ip->i_qadata->qa_qd_num++;
 615                 qd++;
 616         }
 617
 618         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 619             !gid_eq(gid, ip->i_inode.i_gid)) {
 620                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 621                 if (error)
 622                         goto out_unhold;
 623                 ip->i_qadata->qa_qd_num++;
 624                 qd++;
 625         }
 626
 627 out_unhold:
 628         if (error)
 629                 gfs2_quota_unhold(ip);
 630 out:
 631         return error;
 632 }
 633
 634 void gfs2_quota_unhold(struct gfs2_inode *ip)
 635 {
 636         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 637         u32 x;
 638
 639         if (ip->i_qadata == NULL)
 640                 return;
 641
 642         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 643
 644         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 645                 qdsb_put(ip->i_qadata->qa_qd[x]);
 646                 ip->i_qadata->qa_qd[x] = NULL;
 647         }
 648         ip->i_qadata->qa_qd_num = 0;
 649         gfs2_qa_put(ip);
 650 }
 651
 652 static int sort_qd(const void *a, const void *b)
 653 {
 654         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 655         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 656
 657         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 658                 return -1;
 659         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 660                 return 1;
 661         return 0;
 662 }
 663
 664 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 665 {
 666         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 667         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 668         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 669         s64 x;
 670
 671         mutex_lock(&sdp->sd_quota_mutex);
 672         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 673
 674         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 675                 qc->qc_change = 0;
 676                 qc->qc_flags = 0;
 677                 if (qd->qd_id.type == USRQUOTA)
 678                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 679                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 680         }
 681
 682         x = be64_to_cpu(qc->qc_change) + change;
 683         qc->qc_change = cpu_to_be64(x);
 684
 685         spin_lock(&qd_lock);
 686         qd->qd_change = x;
 687         spin_unlock(&qd_lock);
 688
 689         if (!x) {
 690                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 691                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 692                 qc->qc_flags = 0;
 693                 qc->qc_id = 0;
 694                 slot_put(qd);
 695                 qd_put(qd);
 696         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 697                 qd_hold(qd);
 698                 slot_hold(qd);
 699         }
 700
 701         if (change < 0) /* Reset quiet flag if we freed some blocks */
 702                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 703         mutex_unlock(&sdp->sd_quota_mutex);
 704 }
 705
 706 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 707                                   unsigned off, void *buf, unsigned bytes)
 708 {
 709         struct inode *inode = &ip->i_inode;
 710         struct gfs2_sbd *sdp = GFS2_SB(inode);
 711         struct address_space *mapping = inode->i_mapping;
 712         struct page *page;
 713         struct buffer_head *bh;
 714         void *kaddr;
 715         u64 blk;
 716         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 717         unsigned to_write = bytes, pg_off = off;
 718         int done = 0;
 719
 720         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 721         boff = off % bsize;
 722
 723         page = find_or_create_page(mapping, index, GFP_NOFS);
 724         if (!page)
 725                 return -ENOMEM;
 726         if (!page_has_buffers(page))
 727                 create_empty_buffers(page, bsize, 0);
 728
 729         bh = page_buffers(page);
 730         while (!done) {
 731                 /* Find the beginning block within the page */
 732                 if (pg_off >= ((bnum * bsize) + bsize)) {
 733                         bh = bh->b_this_page;
 734                         bnum++;
 735                         blk++;
 736                         continue;
 737                 }
 738                 if (!buffer_mapped(bh)) {
 739                         gfs2_block_map(inode, blk, bh, 1);
 740                         if (!buffer_mapped(bh))
 741                                 goto unlock_out;
 742                         /* If it's a newly allocated disk block, zero it */
 743                         if (buffer_new(bh))
 744                                 zero_user(page, bnum * bsize, bh->b_size);
 745                 }
 746                 if (PageUptodate(page))
 747                         set_buffer_uptodate(bh);
 748                 if (!buffer_uptodate(bh)) {
 749                         ll_rw_block(REQ_OP_READ | REQ_META | REQ_PRIO, 1, &bh);
 750                         wait_on_buffer(bh);
 751                         if (!buffer_uptodate(bh))
 752                                 goto unlock_out;
 753                 }
 754                 if (gfs2_is_jdata(ip))
 755                         gfs2_trans_add_data(ip->i_gl, bh);
 756                 else
 757                         gfs2_ordered_add_inode(ip);
 758
 759                 /* If we need to write to the next block as well */
 760                 if (to_write > (bsize - boff)) {
 761                         pg_off += (bsize - boff);
 762                         to_write -= (bsize - boff);
 763                         boff = pg_off % bsize;
 764                         continue;
 765                 }
 766                 done = 1;
 767         }
 768
 769         /* Write to the page, now that we have setup the buffer(s) */
 770         kaddr = kmap_atomic(page);
 771         memcpy(kaddr + off, buf, bytes);
 772         flush_dcache_page(page);
 773         kunmap_atomic(kaddr);
 774         unlock_page(page);
 775         put_page(page);
 776
 777         return 0;
 778
 779 unlock_out:
 780         unlock_page(page);
 781         put_page(page);
 782         return -EIO;
 783 }
 784
 785 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
 786                                  loff_t loc)
 787 {
 788         unsigned long pg_beg;
 789         unsigned pg_off, nbytes, overflow = 0;
 790         int pg_oflow = 0, error;
 791         void *ptr;
 792
 793         nbytes = sizeof(struct gfs2_quota);
 794
 795         pg_beg = loc >> PAGE_SHIFT;
 796         pg_off = offset_in_page(loc);
 797
 798         /* If the quota straddles a page boundary, split the write in two */
 799         if ((pg_off + nbytes) > PAGE_SIZE) {
 800                 pg_oflow = 1;
 801                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 802         }
 803
 804         ptr = qp;
 805         error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
 806                                        nbytes - overflow);
 807         /* If there's an overflow, write the remaining bytes to the next page */
 808         if (!error && pg_oflow)
 809                 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
 810                                                ptr + nbytes - overflow,
 811                                                overflow);
 812         return error;
 813 }
 814
 815 /**
 816  * gfs2_adjust_quota - adjust record of current block usage
 817  * @ip: The quota inode
 818  * @loc: Offset of the entry in the quota file
 819  * @change: The amount of usage change to record
 820  * @qd: The quota data
 821  * @fdq: The updated limits to record
 822  *
 823  * This function was mostly borrowed from gfs2_block_truncate_page which was
 824  * in turn mostly borrowed from ext3
 825  *
 826  * Returns: 0 or -ve on error
 827  */
 828
 829 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 830                              s64 change, struct gfs2_quota_data *qd,
 831                              struct qc_dqblk *fdq)
 832 {
 833         struct inode *inode = &ip->i_inode;
 834         struct gfs2_sbd *sdp = GFS2_SB(inode);
 835         struct gfs2_quota q;
 836         int err;
 837         u64 size;
 838
 839         if (gfs2_is_stuffed(ip)) {
 840                 err = gfs2_unstuff_dinode(ip);
 841                 if (err)
 842                         return err;
 843         }
 844
 845         memset(&q, 0, sizeof(struct gfs2_quota));
 846         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 847         if (err < 0)
 848                 return err;
 849
 850         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 851         err = -EIO;
 852         be64_add_cpu(&q.qu_value, change);
 853         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 854                 q.qu_value = 0; /* Never go negative on quota usage */
 855         qd->qd_qb.qb_value = q.qu_value;
 856         if (fdq) {
 857                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 858                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 859                         qd->qd_qb.qb_warn = q.qu_warn;
 860                 }
 861                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 862                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 863                         qd->qd_qb.qb_limit = q.qu_limit;
 864                 }
 865                 if (fdq->d_fieldmask & QC_SPACE) {
 866                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 867                         qd->qd_qb.qb_value = q.qu_value;
 868                 }
 869         }
 870
 871         err = gfs2_write_disk_quota(ip, &q, loc);
 872         if (!err) {
 873                 size = loc + sizeof(struct gfs2_quota);
 874                 if (size > inode->i_size)
 875                         i_size_write(inode, size);
 876                 inode->i_mtime = inode->i_atime = current_time(inode);
 877                 mark_inode_dirty(inode);
 878                 set_bit(QDF_REFRESH, &qd->qd_flags);
 879         }
 880
 881         return err;
 882 }
 883
 884 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 885 {
 886         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
 887         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 888         struct gfs2_alloc_parms ap = { .aflags = 0, };
 889         unsigned int data_blocks, ind_blocks;
 890         struct gfs2_holder *ghs, i_gh;
 891         unsigned int qx, x;
 892         struct gfs2_quota_data *qd;
 893         unsigned reserved;
 894         loff_t offset;
 895         unsigned int nalloc = 0, blocks;
 896         int error;
 897
 898         error = gfs2_qa_get(ip);
 899         if (error)
 900                 return error;
 901
 902         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 903                               &data_blocks, &ind_blocks);
 904
 905         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 906         if (!ghs) {
 907                 error = -ENOMEM;
 908                 goto out;
 909         }
 910
 911         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 912         inode_lock(&ip->i_inode);
 913         for (qx = 0; qx < num_qd; qx++) {
 914                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 915                                            GL_NOCACHE, &ghs[qx]);
 916                 if (error)
 917                         goto out_dq;
 918         }
 919
 920         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 921         if (error)
 922                 goto out_dq;
 923
 924         for (x = 0; x < num_qd; x++) {
 925                 offset = qd2offset(qda[x]);
 926                 if (gfs2_write_alloc_required(ip, offset,
 927                                               sizeof(struct gfs2_quota)))
 928                         nalloc++;
 929         }
 930
 931         /*
 932          * 1 blk for unstuffing inode if stuffed. We add this extra
 933          * block to the reservation unconditionally. If the inode
 934          * doesn't need unstuffing, the block will be released to the
 935          * rgrp since it won't be allocated during the transaction
 936          */
 937         /* +3 in the end for unstuffing block, inode size update block
 938          * and another block in case quota straddles page boundary and
 939          * two blocks need to be updated instead of 1 */
 940         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 941
 942         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 943         ap.target = reserved;
 944         error = gfs2_inplace_reserve(ip, &ap);
 945         if (error)
 946                 goto out_alloc;
 947
 948         if (nalloc)
 949                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 950
 951         error = gfs2_trans_begin(sdp, blocks, 0);
 952         if (error)
 953                 goto out_ipres;
 954
 955         for (x = 0; x < num_qd; x++) {
 956                 qd = qda[x];
 957                 offset = qd2offset(qd);
 958                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 959                 if (error)
 960                         goto out_end_trans;
 961
 962                 do_qc(qd, -qd->qd_change_sync);
 963                 set_bit(QDF_REFRESH, &qd->qd_flags);
 964         }
 965
 966         error = 0;
 967
 968 out_end_trans:
 969         gfs2_trans_end(sdp);
 970 out_ipres:
 971         gfs2_inplace_release(ip);
 972 out_alloc:
 973         gfs2_glock_dq_uninit(&i_gh);
 974 out_dq:
 975         while (qx--)
 976                 gfs2_glock_dq_uninit(&ghs[qx]);
 977         inode_unlock(&ip->i_inode);
 978         kfree(ghs);
 979         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 980                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 981 out:
 982         gfs2_qa_put(ip);
 983         return error;
 984 }
 985
 986 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 987 {
 988         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 989         struct gfs2_quota q;
 990         struct gfs2_quota_lvb *qlvb;
 991         loff_t pos;
 992         int error;
 993
 994         memset(&q, 0, sizeof(struct gfs2_quota));
 995         pos = qd2offset(qd);
 996         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 997         if (error < 0)
 998                 return error;
 999
1000         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1001         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1002         qlvb->__pad = 0;
1003         qlvb->qb_limit = q.qu_limit;
1004         qlvb->qb_warn = q.qu_warn;
1005         qlvb->qb_value = q.qu_value;
1006         qd->qd_qb = *qlvb;
1007
1008         return 0;
1009 }
1010
1011 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1012                     struct gfs2_holder *q_gh)
1013 {
1014         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1015         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1016         struct gfs2_holder i_gh;
1017         int error;
1018
1019 restart:
1020         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1021         if (error)
1022                 return error;
1023
1024         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1025                 force_refresh = FORCE;
1026
1027         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1028
1029         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1030                 gfs2_glock_dq_uninit(q_gh);
1031                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1032                                            GL_NOCACHE, q_gh);
1033                 if (error)
1034                         return error;
1035
1036                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1037                 if (error)
1038                         goto fail;
1039
1040                 error = update_qd(sdp, qd);
1041                 if (error)
1042                         goto fail_gunlock;
1043
1044                 gfs2_glock_dq_uninit(&i_gh);
1045                 gfs2_glock_dq_uninit(q_gh);
1046                 force_refresh = 0;
1047                 goto restart;
1048         }
1049
1050         return 0;
1051
1052 fail_gunlock:
1053         gfs2_glock_dq_uninit(&i_gh);
1054 fail:
1055         gfs2_glock_dq_uninit(q_gh);
1056         return error;
1057 }
1058
1059 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1060 {
1061         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1062         struct gfs2_quota_data *qd;
1063         u32 x;
1064         int error = 0;
1065
1066         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1067                 return 0;
1068
1069         error = gfs2_quota_hold(ip, uid, gid);
1070         if (error)
1071                 return error;
1072
1073         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1074              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1075
1076         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1077                 qd = ip->i_qadata->qa_qd[x];
1078                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1079                 if (error)
1080                         break;
1081         }
1082
1083         if (!error)
1084                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1085         else {
1086                 while (x--)
1087                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1088                 gfs2_quota_unhold(ip);
1089         }
1090
1091         return error;
1092 }
1093
1094 static int need_sync(struct gfs2_quota_data *qd)
1095 {
1096         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1097         struct gfs2_tune *gt = &sdp->sd_tune;
1098         s64 value;
1099         unsigned int num, den;
1100         int do_sync = 1;
1101
1102         if (!qd->qd_qb.qb_limit)
1103                 return 0;
1104
1105         spin_lock(&qd_lock);
1106         value = qd->qd_change;
1107         spin_unlock(&qd_lock);
1108
1109         spin_lock(&gt->gt_spin);
1110         num = gt->gt_quota_scale_num;
1111         den = gt->gt_quota_scale_den;
1112         spin_unlock(&gt->gt_spin);
1113
1114         if (value < 0)
1115                 do_sync = 0;
1116         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1117                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1118                 do_sync = 0;
1119         else {
1120                 value *= gfs2_jindex_size(sdp) * num;
1121                 value = div_s64(value, den);
1122                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1123                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1124                         do_sync = 0;
1125         }
1126
1127         return do_sync;
1128 }
1129
1130 void gfs2_quota_unlock(struct gfs2_inode *ip)
1131 {
1132         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1133         struct gfs2_quota_data *qda[4];
1134         unsigned int count = 0;
1135         u32 x;
1136         int found;
1137
1138         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1139                 return;
1140
1141         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1142                 struct gfs2_quota_data *qd;
1143                 int sync;
1144
1145                 qd = ip->i_qadata->qa_qd[x];
1146                 sync = need_sync(qd);
1147
1148                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1149                 if (!sync)
1150                         continue;
1151
1152                 spin_lock(&qd_lock);
1153                 found = qd_check_sync(sdp, qd, NULL);
1154                 spin_unlock(&qd_lock);
1155
1156                 if (!found)
1157                         continue;
1158
1159                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1160                 if (bh_get(qd)) {
1161                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1162                         slot_put(qd);
1163                         qd_put(qd);
1164                         continue;
1165                 }
1166
1167                 qda[count++] = qd;
1168         }
1169
1170         if (count) {
1171                 do_sync(count, qda);
1172                 for (x = 0; x < count; x++)
1173                         qd_unlock(qda[x]);
1174         }
1175
1176         gfs2_quota_unhold(ip);
1177 }
1178
1179 #define MAX_LINE 256
1180
1181 static int print_message(struct gfs2_quota_data *qd, char *type)
1182 {
1183         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1184
1185         fs_info(sdp, "quota %s for %s %u\n",
1186                 type,
1187                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1188                 from_kqid(&init_user_ns, qd->qd_id));
1189
1190         return 0;
1191 }
1192
1193 /**
1194  * gfs2_quota_check - check if allocating new blocks will exceed quota
1195  * @ip:  The inode for which this check is being performed
1196  * @uid: The uid to check against
1197  * @gid: The gid to check against
1198  * @ap:  The allocation parameters. ap->target contains the requested
1199  *       blocks. ap->min_target, if set, contains the minimum blks
1200  *       requested.
1201  *
1202  * Returns: 0 on success.
1203  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1204  *                  quota must allow at least min_req blks for success and
1205  *                  ap->allowed is set to the number of blocks allowed
1206  *
1207  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1208  *                  of blocks available.
1209  */
1210 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1211                      struct gfs2_alloc_parms *ap)
1212 {
1213         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1214         struct gfs2_quota_data *qd;
1215         s64 value, warn, limit;
1216         u32 x;
1217         int error = 0;
1218
1219         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1220         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1221                 return 0;
1222
1223         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1224                 qd = ip->i_qadata->qa_qd[x];
1225
1226                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1227                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1228                         continue;
1229
1230                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1231                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1232                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1233                 spin_lock(&qd_lock);
1234                 value += qd->qd_change;
1235                 spin_unlock(&qd_lock);
1236
1237                 if (limit > 0 && (limit - value) < ap->allowed)
1238                         ap->allowed = limit - value;
1239                 /* If we can't meet the target */
1240                 if (limit && limit < (value + (s64)ap->target)) {
1241                         /* If no min_target specified or we don't meet
1242                          * min_target, return -EDQUOT */
1243                         if (!ap->min_target || ap->min_target > ap->allowed) {
1244                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1245                                                       &qd->qd_flags)) {
1246                                         print_message(qd, "exceeded");
1247                                         quota_send_warning(qd->qd_id,
1248                                                            sdp->sd_vfs->s_dev,
1249                                                            QUOTA_NL_BHARDWARN);
1250                                 }
1251                                 error = -EDQUOT;
1252                                 break;
1253                         }
1254                 } else if (warn && warn < value &&
1255                            time_after_eq(jiffies, qd->qd_last_warn +
1256                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1257                                          * HZ)) {
1258                         quota_send_warning(qd->qd_id,
1259                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1260                         error = print_message(qd, "warning");
1261                         qd->qd_last_warn = jiffies;
1262                 }
1263         }
1264         return error;
1265 }
1266
1267 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1268                        kuid_t uid, kgid_t gid)
1269 {
1270         struct gfs2_quota_data *qd;
1271         u32 x;
1272         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1273
1274         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1275             gfs2_assert_warn(sdp, change))
1276                 return;
1277         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1278                 return;
1279
1280         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1281                                  ip->i_qadata->qa_ref > 0))
1282                 return;
1283         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1284                 qd = ip->i_qadata->qa_qd[x];
1285
1286                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1287                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1288                         do_qc(qd, change);
1289                 }
1290         }
1291 }
1292
1293 int gfs2_quota_sync(struct super_block *sb, int type)
1294 {
1295         struct gfs2_sbd *sdp = sb->s_fs_info;
1296         struct gfs2_quota_data **qda;
1297         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1298         unsigned int num_qd;
1299         unsigned int x;
1300         int error = 0;
1301
1302         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1303         if (!qda)
1304                 return -ENOMEM;
1305
1306         mutex_lock(&sdp->sd_quota_sync_mutex);
1307         sdp->sd_quota_sync_gen++;
1308
1309         do {
1310                 num_qd = 0;
1311
1312                 for (;;) {
1313                         error = qd_fish(sdp, qda + num_qd);
1314                         if (error || !qda[num_qd])
1315                                 break;
1316                         if (++num_qd == max_qd)
1317                                 break;
1318                 }
1319
1320                 if (num_qd) {
1321                         if (!error)
1322                                 error = do_sync(num_qd, qda);
1323                         if (!error)
1324                                 for (x = 0; x < num_qd; x++)
1325                                         qda[x]->qd_sync_gen =
1326                                                 sdp->sd_quota_sync_gen;
1327
1328                         for (x = 0; x < num_qd; x++)
1329                                 qd_unlock(qda[x]);
1330                 }
1331         } while (!error && num_qd == max_qd);
1332
1333         mutex_unlock(&sdp->sd_quota_sync_mutex);
1334         kfree(qda);
1335
1336         return error;
1337 }
1338
1339 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1340 {
1341         struct gfs2_quota_data *qd;
1342         struct gfs2_holder q_gh;
1343         int error;
1344
1345         error = qd_get(sdp, qid, &qd);
1346         if (error)
1347                 return error;
1348
1349         error = do_glock(qd, FORCE, &q_gh);
1350         if (!error)
1351                 gfs2_glock_dq_uninit(&q_gh);
1352
1353         qd_put(qd);
1354         return error;
1355 }
1356
1357 int gfs2_quota_init(struct gfs2_sbd *sdp)
1358 {
1359         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1360         u64 size = i_size_read(sdp->sd_qc_inode);
1361         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1362         unsigned int x, slot = 0;
1363         unsigned int found = 0;
1364         unsigned int hash;
1365         unsigned int bm_size;
1366         u64 dblock;
1367         u32 extlen = 0;
1368         int error;
1369
1370         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1371                 return -EIO;
1372
1373         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1374         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1375         bm_size *= sizeof(unsigned long);
1376         error = -ENOMEM;
1377         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1378         if (sdp->sd_quota_bitmap == NULL)
1379                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1380                                                  __GFP_ZERO);
1381         if (!sdp->sd_quota_bitmap)
1382                 return error;
1383
1384         for (x = 0; x < blocks; x++) {
1385                 struct buffer_head *bh;
1386                 const struct gfs2_quota_change *qc;
1387                 unsigned int y;
1388
1389                 if (!extlen) {
1390                         extlen = 32;
1391                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1392                         if (error)
1393                                 goto fail;
1394                 }
1395                 error = -EIO;
1396                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1397                 if (!bh)
1398                         goto fail;
1399                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1400                         brelse(bh);
1401                         goto fail;
1402                 }
1403
1404                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1405                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1406                      y++, slot++) {
1407                         struct gfs2_quota_data *qd;
1408                         s64 qc_change = be64_to_cpu(qc->qc_change);
1409                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1410                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1411                                                 USRQUOTA : GRPQUOTA;
1412                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1413                                                       be32_to_cpu(qc->qc_id));
1414                         qc++;
1415                         if (!qc_change)
1416                                 continue;
1417
1418                         hash = gfs2_qd_hash(sdp, qc_id);
1419                         qd = qd_alloc(hash, sdp, qc_id);
1420                         if (qd == NULL) {
1421                                 brelse(bh);
1422                                 goto fail;
1423                         }
1424
1425                         set_bit(QDF_CHANGE, &qd->qd_flags);
1426                         qd->qd_change = qc_change;
1427                         qd->qd_slot = slot;
1428                         qd->qd_slot_count = 1;
1429
1430                         spin_lock(&qd_lock);
1431                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1432                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1433                         atomic_inc(&sdp->sd_quota_count);
1434                         spin_unlock(&qd_lock);
1435
1436                         spin_lock_bucket(hash);
1437                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1438                         spin_unlock_bucket(hash);
1439
1440                         found++;
1441                 }
1442
1443                 brelse(bh);
1444                 dblock++;
1445                 extlen--;
1446         }
1447
1448         if (found)
1449                 fs_info(sdp, "found %u quota changes\n", found);
1450
1451         return 0;
1452
1453 fail:
1454         gfs2_quota_cleanup(sdp);
1455         return error;
1456 }
1457
1458 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1459 {
1460         struct list_head *head = &sdp->sd_quota_list;
1461         struct gfs2_quota_data *qd;
1462
1463         spin_lock(&qd_lock);
1464         while (!list_empty(head)) {
1465                 qd = list_last_entry(head, struct gfs2_quota_data, qd_list);
1466
1467                 list_del(&qd->qd_list);
1468
1469                 /* Also remove if this qd exists in the reclaim list */
1470                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1471                 atomic_dec(&sdp->sd_quota_count);
1472                 spin_unlock(&qd_lock);
1473
1474                 spin_lock_bucket(qd->qd_hash);
1475                 hlist_bl_del_rcu(&qd->qd_hlist);
1476                 spin_unlock_bucket(qd->qd_hash);
1477
1478                 gfs2_assert_warn(sdp, !qd->qd_change);
1479                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1480                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1481
1482                 gfs2_glock_put(qd->qd_gl);
1483                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1484
1485                 spin_lock(&qd_lock);
1486         }
1487         spin_unlock(&qd_lock);
1488
1489         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1490
1491         kvfree(sdp->sd_quota_bitmap);
1492         sdp->sd_quota_bitmap = NULL;
1493 }
1494
1495 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1496 {
1497         if (error == 0 || error == -EROFS)
1498                 return;
1499         if (!gfs2_withdrawn(sdp)) {
1500                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1501                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1502                 wake_up(&sdp->sd_logd_waitq);
1503         }
1504 }
1505
1506 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1507                                int (*fxn)(struct super_block *sb, int type),
1508                                unsigned long t, unsigned long *timeo,
1509                                unsigned int *new_timeo)
1510 {
1511         if (t >= *timeo) {
1512                 int error = fxn(sdp->sd_vfs, 0);
1513                 quotad_error(sdp, msg, error);
1514                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1515         } else {
1516                 *timeo -= t;
1517         }
1518 }
1519
1520 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1521         if (!sdp->sd_statfs_force_sync) {
1522                 sdp->sd_statfs_force_sync = 1;
1523                 wake_up(&sdp->sd_quota_wait);
1524         }
1525 }
1526
1527
1528 /**
1529  * gfs2_quotad - Write cached quota changes into the quota file
1530  * @data: Pointer to GFS2 superblock
1531  *
1532  */
1533
1534 int gfs2_quotad(void *data)
1535 {
1536         struct gfs2_sbd *sdp = data;
1537         struct gfs2_tune *tune = &sdp->sd_tune;
1538         unsigned long statfs_timeo = 0;
1539         unsigned long quotad_timeo = 0;
1540         unsigned long t = 0;
1541         DEFINE_WAIT(wait);
1542
1543         while (!kthread_should_stop()) {
1544
1545                 if (gfs2_withdrawn(sdp))
1546                         goto bypass;
1547                 /* Update the master statfs file */
1548                 if (sdp->sd_statfs_force_sync) {
1549                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1550                         quotad_error(sdp, "statfs", error);
1551                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1552                 }
1553                 else
1554                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1555                                            &statfs_timeo,
1556                                            &tune->gt_statfs_quantum);
1557
1558                 /* Update quota file */
1559                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1560                                    &quotad_timeo, &tune->gt_quota_quantum);
1561
1562                 try_to_freeze();
1563
1564 bypass:
1565                 t = min(quotad_timeo, statfs_timeo);
1566
1567                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1568                 if (!sdp->sd_statfs_force_sync)
1569                         t -= schedule_timeout(t);
1570                 else
1571                         t = 0;
1572                 finish_wait(&sdp->sd_quota_wait, &wait);
1573         }
1574
1575         return 0;
1576 }
1577
1578 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1579 {
1580         struct gfs2_sbd *sdp = sb->s_fs_info;
1581
1582         memset(state, 0, sizeof(*state));
1583
1584         switch (sdp->sd_args.ar_quota) {
1585         case GFS2_QUOTA_ON:
1586                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1587                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1588                 fallthrough;
1589         case GFS2_QUOTA_ACCOUNT:
1590                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1591                                                   QCI_SYSFILE;
1592                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1593                                                   QCI_SYSFILE;
1594                 break;
1595         case GFS2_QUOTA_OFF:
1596                 break;
1597         }
1598         if (sdp->sd_quota_inode) {
1599                 state->s_state[USRQUOTA].ino =
1600                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1601                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1602         }
1603         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1604         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1605         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1606         return 0;
1607 }
1608
1609 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1610                           struct qc_dqblk *fdq)
1611 {
1612         struct gfs2_sbd *sdp = sb->s_fs_info;
1613         struct gfs2_quota_lvb *qlvb;
1614         struct gfs2_quota_data *qd;
1615         struct gfs2_holder q_gh;
1616         int error;
1617
1618         memset(fdq, 0, sizeof(*fdq));
1619
1620         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1621                 return -ESRCH; /* Crazy XFS error code */
1622
1623         if ((qid.type != USRQUOTA) &&
1624             (qid.type != GRPQUOTA))
1625                 return -EINVAL;
1626
1627         error = qd_get(sdp, qid, &qd);
1628         if (error)
1629                 return error;
1630         error = do_glock(qd, FORCE, &q_gh);
1631         if (error)
1632                 goto out;
1633
1634         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1635         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1636         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1637         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1638
1639         gfs2_glock_dq_uninit(&q_gh);
1640 out:
1641         qd_put(qd);
1642         return error;
1643 }
1644
1645 /* GFS2 only supports a subset of the XFS fields */
1646 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1647
1648 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1649                           struct qc_dqblk *fdq)
1650 {
1651         struct gfs2_sbd *sdp = sb->s_fs_info;
1652         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1653         struct gfs2_quota_data *qd;
1654         struct gfs2_holder q_gh, i_gh;
1655         unsigned int data_blocks, ind_blocks;
1656         unsigned int blocks = 0;
1657         int alloc_required;
1658         loff_t offset;
1659         int error;
1660
1661         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1662                 return -ESRCH; /* Crazy XFS error code */
1663
1664         if ((qid.type != USRQUOTA) &&
1665             (qid.type != GRPQUOTA))
1666                 return -EINVAL;
1667
1668         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1669                 return -EINVAL;
1670
1671         error = qd_get(sdp, qid, &qd);
1672         if (error)
1673                 return error;
1674
1675         error = gfs2_qa_get(ip);
1676         if (error)
1677                 goto out_put;
1678
1679         inode_lock(&ip->i_inode);
1680         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1681         if (error)
1682                 goto out_unlockput;
1683         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1684         if (error)
1685                 goto out_q;
1686
1687         /* Check for existing entry, if none then alloc new blocks */
1688         error = update_qd(sdp, qd);
1689         if (error)
1690                 goto out_i;
1691
1692         /* If nothing has changed, this is a no-op */
1693         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1694             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1695                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1696
1697         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1698             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1699                 fdq->d_fieldmask ^= QC_SPC_HARD;
1700
1701         if ((fdq->d_fieldmask & QC_SPACE) &&
1702             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1703                 fdq->d_fieldmask ^= QC_SPACE;
1704
1705         if (fdq->d_fieldmask == 0)
1706                 goto out_i;
1707
1708         offset = qd2offset(qd);
1709         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1710         if (gfs2_is_stuffed(ip))
1711                 alloc_required = 1;
1712         if (alloc_required) {
1713                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1714                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1715                                        &data_blocks, &ind_blocks);
1716                 blocks = 1 + data_blocks + ind_blocks;
1717                 ap.target = blocks;
1718                 error = gfs2_inplace_reserve(ip, &ap);
1719                 if (error)
1720                         goto out_i;
1721                 blocks += gfs2_rg_blocks(ip, blocks);
1722         }
1723
1724         /* Some quotas span block boundaries and can update two blocks,
1725            adding an extra block to the transaction to handle such quotas */
1726         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1727         if (error)
1728                 goto out_release;
1729
1730         /* Apply changes */
1731         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1732         if (!error)
1733                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1734
1735         gfs2_trans_end(sdp);
1736 out_release:
1737         if (alloc_required)
1738                 gfs2_inplace_release(ip);
1739 out_i:
1740         gfs2_glock_dq_uninit(&i_gh);
1741 out_q:
1742         gfs2_glock_dq_uninit(&q_gh);
1743 out_unlockput:
1744         gfs2_qa_put(ip);
1745         inode_unlock(&ip->i_inode);
1746 out_put:
1747         qd_put(qd);
1748         return error;
1749 }
1750
1751 const struct quotactl_ops gfs2_quotactl_ops = {
1752         .quota_sync     = gfs2_quota_sync,
1753         .get_state      = gfs2_quota_get_state,
1754         .get_dqblk      = gfs2_get_dqblk,
1755         .set_dqblk      = gfs2_set_dqblk,
1756 };
1757
1758 void __init gfs2_quota_hash_init(void)
1759 {
1760         unsigned i;
1761
1762         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1763                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1764 }