linux/fs/gfs2/quota.c
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10/*
  11 * Quota change tags are associated with each transaction that allocates or
  12 * deallocates space.  Those changes are accumulated locally to each node (in a
  13 * per-node file) and then are periodically synced to the quota file.  This
  14 * avoids the bottleneck of constantly touching the quota file, but introduces
  15 * fuzziness in the current usage value of IDs that are being used on different
  16 * nodes in the cluster simultaneously.  So, it is possible for a user on
  17 * multiple nodes to overrun their quota, but that overrun is controlable.
  18 * Since quota tags are part of transactions, there is no need for a quota check
  19 * program to be run on node crashes or anything like that.
  20 *
  21 * There are couple of knobs that let the administrator manage the quota
  22 * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  23 * sitting on one node before being synced to the quota file.  (The default is
  24 * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  25 * of quota file syncs increases as the user moves closer to their limit.  The
  26 * more frequent the syncs, the more accurate the quota enforcement, but that
  27 * means that there is more contention between the nodes for the quota file.
  28 * The default value is one.  This sets the maximum theoretical quota overrun
  29 * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  30 * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  31 * number greater than one makes quota syncs more frequent and reduces the
  32 * maximum overrun.  Numbers less than one (but greater than zero) make quota
  33 * syncs less frequent.
  34 *
  35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  36 * the quota file, so it is not being constantly read.
  37 */
  38
  39#include <linux/sched.h>
  40#include <linux/slab.h>
  41#include <linux/mm.h>
  42#include <linux/spinlock.h>
  43#include <linux/completion.h>
  44#include <linux/buffer_head.h>
  45#include <linux/sort.h>
  46#include <linux/fs.h>
  47#include <linux/bio.h>
  48#include <linux/gfs2_ondisk.h>
  49#include <linux/kthread.h>
  50#include <linux/freezer.h>
  51#include <linux/quota.h>
  52#include <linux/dqblk_xfs.h>
  53
  54#include "gfs2.h"
  55#include "incore.h"
  56#include "bmap.h"
  57#include "glock.h"
  58#include "glops.h"
  59#include "log.h"
  60#include "meta_io.h"
  61#include "quota.h"
  62#include "rgrp.h"
  63#include "super.h"
  64#include "trans.h"
  65#include "inode.h"
  66#include "util.h"
  67
  68#define QUOTA_USER 1
  69#define QUOTA_GROUP 0
  70
  71struct gfs2_quota_change_host {
  72        u64 qc_change;
  73        u32 qc_flags; /* GFS2_QCF_... */
  74        u32 qc_id;
  75};
  76
  77static LIST_HEAD(qd_lru_list);
  78static atomic_t qd_lru_count = ATOMIC_INIT(0);
  79static DEFINE_SPINLOCK(qd_lru_lock);
  80
  81int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
  82{
  83        struct gfs2_quota_data *qd;
  84        struct gfs2_sbd *sdp;
  85        int nr_to_scan = sc->nr_to_scan;
  86
  87        if (nr_to_scan == 0)
  88                goto out;
  89
  90        if (!(sc->gfp_mask & __GFP_FS))
  91                return -1;
  92
  93        spin_lock(&qd_lru_lock);
  94        while (nr_to_scan && !list_empty(&qd_lru_list)) {
  95                qd = list_entry(qd_lru_list.next,
  96                                struct gfs2_quota_data, qd_reclaim);
  97                sdp = qd->qd_gl->gl_sbd;
  98
  99                /* Free from the filesystem-specific list */
 100                list_del(&qd->qd_list);
 101
 102                gfs2_assert_warn(sdp, !qd->qd_change);
 103                gfs2_assert_warn(sdp, !qd->qd_slot_count);
 104                gfs2_assert_warn(sdp, !qd->qd_bh_count);
 105
 106                gfs2_glock_put(qd->qd_gl);
 107                atomic_dec(&sdp->sd_quota_count);
 108
 109                /* Delete it from the common reclaim list */
 110                list_del_init(&qd->qd_reclaim);
 111                atomic_dec(&qd_lru_count);
 112                spin_unlock(&qd_lru_lock);
 113                kmem_cache_free(gfs2_quotad_cachep, qd);
 114                spin_lock(&qd_lru_lock);
 115                nr_to_scan--;
 116        }
 117        spin_unlock(&qd_lru_lock);
 118
 119out:
 120        return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 121}
 122
 123static u64 qd2offset(struct gfs2_quota_data *qd)
 124{
 125        u64 offset;
 126
 127        offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
 128        offset *= sizeof(struct gfs2_quota);
 129
 130        return offset;
 131}
 132
 133static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
 134                    struct gfs2_quota_data **qdp)
 135{
 136        struct gfs2_quota_data *qd;
 137        int error;
 138
 139        qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 140        if (!qd)
 141                return -ENOMEM;
 142
 143        atomic_set(&qd->qd_count, 1);
 144        qd->qd_id = id;
 145        if (user)
 146                set_bit(QDF_USER, &qd->qd_flags);
 147        qd->qd_slot = -1;
 148        INIT_LIST_HEAD(&qd->qd_reclaim);
 149
 150        error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
 151                              &gfs2_quota_glops, CREATE, &qd->qd_gl);
 152        if (error)
 153                goto fail;
 154
 155        *qdp = qd;
 156
 157        return 0;
 158
 159fail:
 160        kmem_cache_free(gfs2_quotad_cachep, qd);
 161        return error;
 162}
 163
 164static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
 165                  struct gfs2_quota_data **qdp)
 166{
 167        struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 168        int error, found;
 169
 170        *qdp = NULL;
 171
 172        for (;;) {
 173                found = 0;
 174                spin_lock(&qd_lru_lock);
 175                list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 176                        if (qd->qd_id == id &&
 177                            !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 178                                if (!atomic_read(&qd->qd_count) &&
 179                                    !list_empty(&qd->qd_reclaim)) {
 180                                        /* Remove it from reclaim list */
 181                                        list_del_init(&qd->qd_reclaim);
 182                                        atomic_dec(&qd_lru_count);
 183                                }
 184                                atomic_inc(&qd->qd_count);
 185                                found = 1;
 186                                break;
 187                        }
 188                }
 189
 190                if (!found)
 191                        qd = NULL;
 192
 193                if (!qd && new_qd) {
 194                        qd = new_qd;
 195                        list_add(&qd->qd_list, &sdp->sd_quota_list);
 196                        atomic_inc(&sdp->sd_quota_count);
 197                        new_qd = NULL;
 198                }
 199
 200                spin_unlock(&qd_lru_lock);
 201
 202                if (qd) {
 203                        if (new_qd) {
 204                                gfs2_glock_put(new_qd->qd_gl);
 205                                kmem_cache_free(gfs2_quotad_cachep, new_qd);
 206                        }
 207                        *qdp = qd;
 208                        return 0;
 209                }
 210
 211                error = qd_alloc(sdp, user, id, &new_qd);
 212                if (error)
 213                        return error;
 214        }
 215}
 216
 217static void qd_hold(struct gfs2_quota_data *qd)
 218{
 219        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 220        gfs2_assert(sdp, atomic_read(&qd->qd_count));
 221        atomic_inc(&qd->qd_count);
 222}
 223
 224static void qd_put(struct gfs2_quota_data *qd)
 225{
 226        if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
 227                /* Add to the reclaim list */
 228                list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 229                atomic_inc(&qd_lru_count);
 230                spin_unlock(&qd_lru_lock);
 231        }
 232}
 233
 234static int slot_get(struct gfs2_quota_data *qd)
 235{
 236        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 237        unsigned int c, o = 0, b;
 238        unsigned char byte = 0;
 239
 240        spin_lock(&qd_lru_lock);
 241
 242        if (qd->qd_slot_count++) {
 243                spin_unlock(&qd_lru_lock);
 244                return 0;
 245        }
 246
 247        for (c = 0; c < sdp->sd_quota_chunks; c++)
 248                for (o = 0; o < PAGE_SIZE; o++) {
 249                        byte = sdp->sd_quota_bitmap[c][o];
 250                        if (byte != 0xFF)
 251                                goto found;
 252                }
 253
 254        goto fail;
 255
 256found:
 257        for (b = 0; b < 8; b++)
 258                if (!(byte & (1 << b)))
 259                        break;
 260        qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 261
 262        if (qd->qd_slot >= sdp->sd_quota_slots)
 263                goto fail;
 264
 265        sdp->sd_quota_bitmap[c][o] |= 1 << b;
 266
 267        spin_unlock(&qd_lru_lock);
 268
 269        return 0;
 270
 271fail:
 272        qd->qd_slot_count--;
 273        spin_unlock(&qd_lru_lock);
 274        return -ENOSPC;
 275}
 276
 277static void slot_hold(struct gfs2_quota_data *qd)
 278{
 279        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 280
 281        spin_lock(&qd_lru_lock);
 282        gfs2_assert(sdp, qd->qd_slot_count);
 283        qd->qd_slot_count++;
 284        spin_unlock(&qd_lru_lock);
 285}
 286
 287static void slot_put(struct gfs2_quota_data *qd)
 288{
 289        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 290
 291        spin_lock(&qd_lru_lock);
 292        gfs2_assert(sdp, qd->qd_slot_count);
 293        if (!--qd->qd_slot_count) {
 294                gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 295                qd->qd_slot = -1;
 296        }
 297        spin_unlock(&qd_lru_lock);
 298}
 299
 300static int bh_get(struct gfs2_quota_data *qd)
 301{
 302        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 303        struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 304        unsigned int block, offset;
 305        struct buffer_head *bh;
 306        int error;
 307        struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 308
 309        mutex_lock(&sdp->sd_quota_mutex);
 310
 311        if (qd->qd_bh_count++) {
 312                mutex_unlock(&sdp->sd_quota_mutex);
 313                return 0;
 314        }
 315
 316        block = qd->qd_slot / sdp->sd_qc_per_block;
 317        offset = qd->qd_slot % sdp->sd_qc_per_block;
 318
 319        bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 320        error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 321        if (error)
 322                goto fail;
 323        error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 324        if (error)
 325                goto fail;
 326        error = -EIO;
 327        if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 328                goto fail_brelse;
 329
 330        qd->qd_bh = bh;
 331        qd->qd_bh_qc = (struct gfs2_quota_change *)
 332                (bh->b_data + sizeof(struct gfs2_meta_header) +
 333                 offset * sizeof(struct gfs2_quota_change));
 334
 335        mutex_unlock(&sdp->sd_quota_mutex);
 336
 337        return 0;
 338
 339fail_brelse:
 340        brelse(bh);
 341fail:
 342        qd->qd_bh_count--;
 343        mutex_unlock(&sdp->sd_quota_mutex);
 344        return error;
 345}
 346
 347static void bh_put(struct gfs2_quota_data *qd)
 348{
 349        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 350
 351        mutex_lock(&sdp->sd_quota_mutex);
 352        gfs2_assert(sdp, qd->qd_bh_count);
 353        if (!--qd->qd_bh_count) {
 354                brelse(qd->qd_bh);
 355                qd->qd_bh = NULL;
 356                qd->qd_bh_qc = NULL;
 357        }
 358        mutex_unlock(&sdp->sd_quota_mutex);
 359}
 360
 361static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 362{
 363        struct gfs2_quota_data *qd = NULL;
 364        int error;
 365        int found = 0;
 366
 367        *qdp = NULL;
 368
 369        if (sdp->sd_vfs->s_flags & MS_RDONLY)
 370                return 0;
 371
 372        spin_lock(&qd_lru_lock);
 373
 374        list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 375                if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 376                    !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 377                    qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 378                        continue;
 379
 380                list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 381
 382                set_bit(QDF_LOCKED, &qd->qd_flags);
 383                gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 384                atomic_inc(&qd->qd_count);
 385                qd->qd_change_sync = qd->qd_change;
 386                gfs2_assert_warn(sdp, qd->qd_slot_count);
 387                qd->qd_slot_count++;
 388                found = 1;
 389
 390                break;
 391        }
 392
 393        if (!found)
 394                qd = NULL;
 395
 396        spin_unlock(&qd_lru_lock);
 397
 398        if (qd) {
 399                gfs2_assert_warn(sdp, qd->qd_change_sync);
 400                error = bh_get(qd);
 401                if (error) {
 402                        clear_bit(QDF_LOCKED, &qd->qd_flags);
 403                        slot_put(qd);
 404                        qd_put(qd);
 405                        return error;
 406                }
 407        }
 408
 409        *qdp = qd;
 410
 411        return 0;
 412}
 413
 414static int qd_trylock(struct gfs2_quota_data *qd)
 415{
 416        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 417
 418        if (sdp->sd_vfs->s_flags & MS_RDONLY)
 419                return 0;
 420
 421        spin_lock(&qd_lru_lock);
 422
 423        if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 424            !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 425                spin_unlock(&qd_lru_lock);
 426                return 0;
 427        }
 428
 429        list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 430
 431        set_bit(QDF_LOCKED, &qd->qd_flags);
 432        gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 433        atomic_inc(&qd->qd_count);
 434        qd->qd_change_sync = qd->qd_change;
 435        gfs2_assert_warn(sdp, qd->qd_slot_count);
 436        qd->qd_slot_count++;
 437
 438        spin_unlock(&qd_lru_lock);
 439
 440        gfs2_assert_warn(sdp, qd->qd_change_sync);
 441        if (bh_get(qd)) {
 442                clear_bit(QDF_LOCKED, &qd->qd_flags);
 443                slot_put(qd);
 444                qd_put(qd);
 445                return 0;
 446        }
 447
 448        return 1;
 449}
 450
 451static void qd_unlock(struct gfs2_quota_data *qd)
 452{
 453        gfs2_assert_warn(qd->qd_gl->gl_sbd,
 454                         test_bit(QDF_LOCKED, &qd->qd_flags));
 455        clear_bit(QDF_LOCKED, &qd->qd_flags);
 456        bh_put(qd);
 457        slot_put(qd);
 458        qd_put(qd);
 459}
 460
 461static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
 462                    struct gfs2_quota_data **qdp)
 463{
 464        int error;
 465
 466        error = qd_get(sdp, user, id, qdp);
 467        if (error)
 468                return error;
 469
 470        error = slot_get(*qdp);
 471        if (error)
 472                goto fail;
 473
 474        error = bh_get(*qdp);
 475        if (error)
 476                goto fail_slot;
 477
 478        return 0;
 479
 480fail_slot:
 481        slot_put(*qdp);
 482fail:
 483        qd_put(*qdp);
 484        return error;
 485}
 486
 487static void qdsb_put(struct gfs2_quota_data *qd)
 488{
 489        bh_put(qd);
 490        slot_put(qd);
 491        qd_put(qd);
 492}
 493
 494int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 495{
 496        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 497        struct gfs2_quota_data **qd;
 498        int error;
 499
 500        if (ip->i_res == NULL)
 501                gfs2_rs_alloc(ip);
 502
 503        qd = ip->i_res->rs_qa_qd;
 504
 505        if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 506            gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 507                return -EIO;
 508
 509        if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 510                return 0;
 511
 512        error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
 513        if (error)
 514                goto out;
 515        ip->i_res->rs_qa_qd_num++;
 516        qd++;
 517
 518        error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
 519        if (error)
 520                goto out;
 521        ip->i_res->rs_qa_qd_num++;
 522        qd++;
 523
 524        if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 525                error = qdsb_get(sdp, QUOTA_USER, uid, qd);
 526                if (error)
 527                        goto out;
 528                ip->i_res->rs_qa_qd_num++;
 529                qd++;
 530        }
 531
 532        if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 533                error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
 534                if (error)
 535                        goto out;
 536                ip->i_res->rs_qa_qd_num++;
 537                qd++;
 538        }
 539
 540out:
 541        if (error)
 542                gfs2_quota_unhold(ip);
 543        return error;
 544}
 545
 546void gfs2_quota_unhold(struct gfs2_inode *ip)
 547{
 548        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 549        unsigned int x;
 550
 551        if (ip->i_res == NULL)
 552                return;
 553        gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 554
 555        for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 556                qdsb_put(ip->i_res->rs_qa_qd[x]);
 557                ip->i_res->rs_qa_qd[x] = NULL;
 558        }
 559        ip->i_res->rs_qa_qd_num = 0;
 560}
 561
 562static int sort_qd(const void *a, const void *b)
 563{
 564        const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 565        const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 566
 567        if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 568            !test_bit(QDF_USER, &qd_b->qd_flags)) {
 569                if (test_bit(QDF_USER, &qd_a->qd_flags))
 570                        return -1;
 571                else
 572                        return 1;
 573        }
 574        if (qd_a->qd_id < qd_b->qd_id)
 575                return -1;
 576        if (qd_a->qd_id > qd_b->qd_id)
 577                return 1;
 578
 579        return 0;
 580}
 581
 582static void do_qc(struct gfs2_quota_data *qd, s64 change)
 583{
 584        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 585        struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 586        struct gfs2_quota_change *qc = qd->qd_bh_qc;
 587        s64 x;
 588
 589        mutex_lock(&sdp->sd_quota_mutex);
 590        gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 591
 592        if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 593                qc->qc_change = 0;
 594                qc->qc_flags = 0;
 595                if (test_bit(QDF_USER, &qd->qd_flags))
 596                        qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 597                qc->qc_id = cpu_to_be32(qd->qd_id);
 598        }
 599
 600        x = be64_to_cpu(qc->qc_change) + change;
 601        qc->qc_change = cpu_to_be64(x);
 602
 603        spin_lock(&qd_lru_lock);
 604        qd->qd_change = x;
 605        spin_unlock(&qd_lru_lock);
 606
 607        if (!x) {
 608                gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 609                clear_bit(QDF_CHANGE, &qd->qd_flags);
 610                qc->qc_flags = 0;
 611                qc->qc_id = 0;
 612                slot_put(qd);
 613                qd_put(qd);
 614        } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 615                qd_hold(qd);
 616                slot_hold(qd);
 617        }
 618
 619        mutex_unlock(&sdp->sd_quota_mutex);
 620}
 621
 622/**
 623 * gfs2_adjust_quota - adjust record of current block usage
 624 * @ip: The quota inode
 625 * @loc: Offset of the entry in the quota file
 626 * @change: The amount of usage change to record
 627 * @qd: The quota data
 628 * @fdq: The updated limits to record
 629 *
 630 * This function was mostly borrowed from gfs2_block_truncate_page which was
 631 * in turn mostly borrowed from ext3
 632 *
 633 * Returns: 0 or -ve on error
 634 */
 635
 636static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 637                             s64 change, struct gfs2_quota_data *qd,
 638                             struct fs_disk_quota *fdq)
 639{
 640        struct inode *inode = &ip->i_inode;
 641        struct gfs2_sbd *sdp = GFS2_SB(inode);
 642        struct address_space *mapping = inode->i_mapping;
 643        unsigned long index = loc >> PAGE_CACHE_SHIFT;
 644        unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 645        unsigned blocksize, iblock, pos;
 646        struct buffer_head *bh;
 647        struct page *page;
 648        void *kaddr, *ptr;
 649        struct gfs2_quota q, *qp;
 650        int err, nbytes;
 651        u64 size;
 652
 653        if (gfs2_is_stuffed(ip)) {
 654                err = gfs2_unstuff_dinode(ip, NULL);
 655                if (err)
 656                        return err;
 657        }
 658
 659        memset(&q, 0, sizeof(struct gfs2_quota));
 660        err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 661        if (err < 0)
 662                return err;
 663
 664        err = -EIO;
 665        qp = &q;
 666        qp->qu_value = be64_to_cpu(qp->qu_value);
 667        qp->qu_value += change;
 668        qp->qu_value = cpu_to_be64(qp->qu_value);
 669        qd->qd_qb.qb_value = qp->qu_value;
 670        if (fdq) {
 671                if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 672                        qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 673                        qd->qd_qb.qb_warn = qp->qu_warn;
 674                }
 675                if (fdq->d_fieldmask & FS_DQ_BHARD) {
 676                        qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 677                        qd->qd_qb.qb_limit = qp->qu_limit;
 678                }
 679                if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 680                        qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 681                        qd->qd_qb.qb_value = qp->qu_value;
 682                }
 683        }
 684
 685        /* Write the quota into the quota file on disk */
 686        ptr = qp;
 687        nbytes = sizeof(struct gfs2_quota);
 688get_a_page:
 689        page = find_or_create_page(mapping, index, GFP_NOFS);
 690        if (!page)
 691                return -ENOMEM;
 692
 693        blocksize = inode->i_sb->s_blocksize;
 694        iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 695
 696        if (!page_has_buffers(page))
 697                create_empty_buffers(page, blocksize, 0);
 698
 699        bh = page_buffers(page);
 700        pos = blocksize;
 701        while (offset >= pos) {
 702                bh = bh->b_this_page;
 703                iblock++;
 704                pos += blocksize;
 705        }
 706
 707        if (!buffer_mapped(bh)) {
 708                gfs2_block_map(inode, iblock, bh, 1);
 709                if (!buffer_mapped(bh))
 710                        goto unlock_out;
 711                /* If it's a newly allocated disk block for quota, zero it */
 712                if (buffer_new(bh))
 713                        zero_user(page, pos - blocksize, bh->b_size);
 714        }
 715
 716        if (PageUptodate(page))
 717                set_buffer_uptodate(bh);
 718
 719        if (!buffer_uptodate(bh)) {
 720                ll_rw_block(READ | REQ_META, 1, &bh);
 721                wait_on_buffer(bh);
 722                if (!buffer_uptodate(bh))
 723                        goto unlock_out;
 724        }
 725
 726        gfs2_trans_add_bh(ip->i_gl, bh, 0);
 727
 728        kaddr = kmap_atomic(page);
 729        if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 730                nbytes = PAGE_CACHE_SIZE - offset;
 731        memcpy(kaddr + offset, ptr, nbytes);
 732        flush_dcache_page(page);
 733        kunmap_atomic(kaddr);
 734        unlock_page(page);
 735        page_cache_release(page);
 736
 737        /* If quota straddles page boundary, we need to update the rest of the
 738         * quota at the beginning of the next page */
 739        if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 740                ptr = ptr + nbytes;
 741                nbytes = sizeof(struct gfs2_quota) - nbytes;
 742                offset = 0;
 743                index++;
 744                goto get_a_page;
 745        }
 746
 747        size = loc + sizeof(struct gfs2_quota);
 748        if (size > inode->i_size)
 749                i_size_write(inode, size);
 750        inode->i_mtime = inode->i_atime = CURRENT_TIME;
 751        mark_inode_dirty(inode);
 752        return 0;
 753
 754unlock_out:
 755        unlock_page(page);
 756        page_cache_release(page);
 757        return err;
 758}
 759
 760static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 761{
 762        struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 763        struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 764        unsigned int data_blocks, ind_blocks;
 765        struct gfs2_holder *ghs, i_gh;
 766        unsigned int qx, x;
 767        struct gfs2_quota_data *qd;
 768        loff_t offset;
 769        unsigned int nalloc = 0, blocks;
 770        int error;
 771
 772        error = gfs2_rs_alloc(ip);
 773        if (error)
 774                return error;
 775
 776        gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 777                              &data_blocks, &ind_blocks);
 778
 779        ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 780        if (!ghs)
 781                return -ENOMEM;
 782
 783        sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 784        mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
 785        for (qx = 0; qx < num_qd; qx++) {
 786                error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 787                                           GL_NOCACHE, &ghs[qx]);
 788                if (error)
 789                        goto out;
 790        }
 791
 792        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 793        if (error)
 794                goto out;
 795
 796        for (x = 0; x < num_qd; x++) {
 797                offset = qd2offset(qda[x]);
 798                if (gfs2_write_alloc_required(ip, offset,
 799                                              sizeof(struct gfs2_quota)))
 800                        nalloc++;
 801        }
 802
 803        /* 
 804         * 1 blk for unstuffing inode if stuffed. We add this extra
 805         * block to the reservation unconditionally. If the inode
 806         * doesn't need unstuffing, the block will be released to the 
 807         * rgrp since it won't be allocated during the transaction
 808         */
 809        /* +3 in the end for unstuffing block, inode size update block
 810         * and another block in case quota straddles page boundary and 
 811         * two blocks need to be updated instead of 1 */
 812        blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 813
 814        error = gfs2_inplace_reserve(ip, 1 +
 815                                     (nalloc * (data_blocks + ind_blocks)));
 816        if (error)
 817                goto out_alloc;
 818
 819        if (nalloc)
 820                blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS;
 821
 822        error = gfs2_trans_begin(sdp, blocks, 0);
 823        if (error)
 824                goto out_ipres;
 825
 826        for (x = 0; x < num_qd; x++) {
 827                qd = qda[x];
 828                offset = qd2offset(qd);
 829                error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 830                if (error)
 831                        goto out_end_trans;
 832
 833                do_qc(qd, -qd->qd_change_sync);
 834                set_bit(QDF_REFRESH, &qd->qd_flags);
 835        }
 836
 837        error = 0;
 838
 839out_end_trans:
 840        gfs2_trans_end(sdp);
 841out_ipres:
 842        gfs2_inplace_release(ip);
 843out_alloc:
 844        gfs2_glock_dq_uninit(&i_gh);
 845out:
 846        while (qx--)
 847                gfs2_glock_dq_uninit(&ghs[qx]);
 848        mutex_unlock(&ip->i_inode.i_mutex);
 849        kfree(ghs);
 850        gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 851        return error;
 852}
 853
 854static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 855{
 856        struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 857        struct gfs2_quota q;
 858        struct gfs2_quota_lvb *qlvb;
 859        loff_t pos;
 860        int error;
 861
 862        memset(&q, 0, sizeof(struct gfs2_quota));
 863        pos = qd2offset(qd);
 864        error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 865        if (error < 0)
 866                return error;
 867
 868        qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 869        qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 870        qlvb->__pad = 0;
 871        qlvb->qb_limit = q.qu_limit;
 872        qlvb->qb_warn = q.qu_warn;
 873        qlvb->qb_value = q.qu_value;
 874        qd->qd_qb = *qlvb;
 875
 876        return 0;
 877}
 878
 879static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 880                    struct gfs2_holder *q_gh)
 881{
 882        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 883        struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 884        struct gfs2_holder i_gh;
 885        int error;
 886
 887restart:
 888        error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 889        if (error)
 890                return error;
 891
 892        qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 893
 894        if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 895                gfs2_glock_dq_uninit(q_gh);
 896                error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 897                                           GL_NOCACHE, q_gh);
 898                if (error)
 899                        return error;
 900
 901                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 902                if (error)
 903                        goto fail;
 904
 905                error = update_qd(sdp, qd);
 906                if (error)
 907                        goto fail_gunlock;
 908
 909                gfs2_glock_dq_uninit(&i_gh);
 910                gfs2_glock_dq_uninit(q_gh);
 911                force_refresh = 0;
 912                goto restart;
 913        }
 914
 915        return 0;
 916
 917fail_gunlock:
 918        gfs2_glock_dq_uninit(&i_gh);
 919fail:
 920        gfs2_glock_dq_uninit(q_gh);
 921        return error;
 922}
 923
 924int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 925{
 926        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 927        struct gfs2_quota_data *qd;
 928        unsigned int x;
 929        int error = 0;
 930
 931        error = gfs2_quota_hold(ip, uid, gid);
 932        if (error)
 933                return error;
 934
 935        if (capable(CAP_SYS_RESOURCE) ||
 936            sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 937                return 0;
 938
 939        sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 940             sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 941
 942        for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 943                int force = NO_FORCE;
 944                qd = ip->i_res->rs_qa_qd[x];
 945                if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 946                        force = FORCE;
 947                error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 948                if (error)
 949                        break;
 950        }
 951
 952        if (!error)
 953                set_bit(GIF_QD_LOCKED, &ip->i_flags);
 954        else {
 955                while (x--)
 956                        gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 957                gfs2_quota_unhold(ip);
 958        }
 959
 960        return error;
 961}
 962
 963static int need_sync(struct gfs2_quota_data *qd)
 964{
 965        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 966        struct gfs2_tune *gt = &sdp->sd_tune;
 967        s64 value;
 968        unsigned int num, den;
 969        int do_sync = 1;
 970
 971        if (!qd->qd_qb.qb_limit)
 972                return 0;
 973
 974        spin_lock(&qd_lru_lock);
 975        value = qd->qd_change;
 976        spin_unlock(&qd_lru_lock);
 977
 978        spin_lock(&gt->gt_spin);
 979        num = gt->gt_quota_scale_num;
 980        den = gt->gt_quota_scale_den;
 981        spin_unlock(&gt->gt_spin);
 982
 983        if (value < 0)
 984                do_sync = 0;
 985        else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 986                 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 987                do_sync = 0;
 988        else {
 989                value *= gfs2_jindex_size(sdp) * num;
 990                value = div_s64(value, den);
 991                value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 992                if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 993                        do_sync = 0;
 994        }
 995
 996        return do_sync;
 997}
 998
 999void gfs2_quota_unlock(struct gfs2_inode *ip)
1000{
1001        struct gfs2_quota_data *qda[4];
1002        unsigned int count = 0;
1003        unsigned int x;
1004
1005        if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1006                goto out;
1007
1008        for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1009                struct gfs2_quota_data *qd;
1010                int sync;
1011
1012                qd = ip->i_res->rs_qa_qd[x];
1013                sync = need_sync(qd);
1014
1015                gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1016
1017                if (sync && qd_trylock(qd))
1018                        qda[count++] = qd;
1019        }
1020
1021        if (count) {
1022                do_sync(count, qda);
1023                for (x = 0; x < count; x++)
1024                        qd_unlock(qda[x]);
1025        }
1026
1027out:
1028        gfs2_quota_unhold(ip);
1029}
1030
1031#define MAX_LINE 256
1032
1033static int print_message(struct gfs2_quota_data *qd, char *type)
1034{
1035        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1036
1037        printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1038               sdp->sd_fsname, type,
1039               (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1040               qd->qd_id);
1041
1042        return 0;
1043}
1044
1045int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1046{
1047        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1048        struct gfs2_quota_data *qd;
1049        s64 value;
1050        unsigned int x;
1051        int error = 0;
1052
1053        if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1054                return 0;
1055
1056        if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1057                return 0;
1058
1059        for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1060                qd = ip->i_res->rs_qa_qd[x];
1061
1062                if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1063                      (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1064                        continue;
1065
1066                value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1067                spin_lock(&qd_lru_lock);
1068                value += qd->qd_change;
1069                spin_unlock(&qd_lru_lock);
1070
1071                if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1072                        print_message(qd, "exceeded");
1073                        quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1074                                           USRQUOTA : GRPQUOTA, qd->qd_id,
1075                                           sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1076
1077                        error = -EDQUOT;
1078                        break;
1079                } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1080                           (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1081                           time_after_eq(jiffies, qd->qd_last_warn +
1082                                         gfs2_tune_get(sdp,
1083                                                gt_quota_warn_period) * HZ)) {
1084                        quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1085                                           USRQUOTA : GRPQUOTA, qd->qd_id,
1086                                           sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1087                        error = print_message(qd, "warning");
1088                        qd->qd_last_warn = jiffies;
1089                }
1090        }
1091
1092        return error;
1093}
1094
1095void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1096                       u32 uid, u32 gid)
1097{
1098        struct gfs2_quota_data *qd;
1099        unsigned int x;
1100
1101        if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1102                return;
1103        if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1104                return;
1105
1106        for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1107                qd = ip->i_res->rs_qa_qd[x];
1108
1109                if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1110                    (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1111                        do_qc(qd, change);
1112                }
1113        }
1114}
1115
1116int gfs2_quota_sync(struct super_block *sb, int type)
1117{
1118        struct gfs2_sbd *sdp = sb->s_fs_info;
1119        struct gfs2_quota_data **qda;
1120        unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1121        unsigned int num_qd;
1122        unsigned int x;
1123        int error = 0;
1124
1125        sdp->sd_quota_sync_gen++;
1126
1127        qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1128        if (!qda)
1129                return -ENOMEM;
1130
1131        do {
1132                num_qd = 0;
1133
1134                for (;;) {
1135                        error = qd_fish(sdp, qda + num_qd);
1136                        if (error || !qda[num_qd])
1137                                break;
1138                        if (++num_qd == max_qd)
1139                                break;
1140                }
1141
1142                if (num_qd) {
1143                        if (!error)
1144                                error = do_sync(num_qd, qda);
1145                        if (!error)
1146                                for (x = 0; x < num_qd; x++)
1147                                        qda[x]->qd_sync_gen =
1148                                                sdp->sd_quota_sync_gen;
1149
1150                        for (x = 0; x < num_qd; x++)
1151                                qd_unlock(qda[x]);
1152                }
1153        } while (!error && num_qd == max_qd);
1154
1155        kfree(qda);
1156
1157        return error;
1158}
1159
1160static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1161{
1162        return gfs2_quota_sync(sb, type);
1163}
1164
1165int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1166{
1167        struct gfs2_quota_data *qd;
1168        struct gfs2_holder q_gh;
1169        int error;
1170
1171        error = qd_get(sdp, user, id, &qd);
1172        if (error)
1173                return error;
1174
1175        error = do_glock(qd, FORCE, &q_gh);
1176        if (!error)
1177                gfs2_glock_dq_uninit(&q_gh);
1178
1179        qd_put(qd);
1180        return error;
1181}
1182
1183static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1184{
1185        const struct gfs2_quota_change *str = buf;
1186
1187        qc->qc_change = be64_to_cpu(str->qc_change);
1188        qc->qc_flags = be32_to_cpu(str->qc_flags);
1189        qc->qc_id = be32_to_cpu(str->qc_id);
1190}
1191
1192int gfs2_quota_init(struct gfs2_sbd *sdp)
1193{
1194        struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1195        u64 size = i_size_read(sdp->sd_qc_inode);
1196        unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1197        unsigned int x, slot = 0;
1198        unsigned int found = 0;
1199        u64 dblock;
1200        u32 extlen = 0;
1201        int error;
1202
1203        if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1204                return -EIO;
1205
1206        sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1207        sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1208
1209        error = -ENOMEM;
1210
1211        sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1212                                       sizeof(unsigned char *), GFP_NOFS);
1213        if (!sdp->sd_quota_bitmap)
1214                return error;
1215
1216        for (x = 0; x < sdp->sd_quota_chunks; x++) {
1217                sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1218                if (!sdp->sd_quota_bitmap[x])
1219                        goto fail;
1220        }
1221
1222        for (x = 0; x < blocks; x++) {
1223                struct buffer_head *bh;
1224                unsigned int y;
1225
1226                if (!extlen) {
1227                        int new = 0;
1228                        error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1229                        if (error)
1230                                goto fail;
1231                }
1232                error = -EIO;
1233                bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1234                if (!bh)
1235                        goto fail;
1236                if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1237                        brelse(bh);
1238                        goto fail;
1239                }
1240
1241                for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1242                     y++, slot++) {
1243                        struct gfs2_quota_change_host qc;
1244                        struct gfs2_quota_data *qd;
1245
1246                        gfs2_quota_change_in(&qc, bh->b_data +
1247                                          sizeof(struct gfs2_meta_header) +
1248                                          y * sizeof(struct gfs2_quota_change));
1249                        if (!qc.qc_change)
1250                                continue;
1251
1252                        error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1253                                         qc.qc_id, &qd);
1254                        if (error) {
1255                                brelse(bh);
1256                                goto fail;
1257                        }
1258
1259                        set_bit(QDF_CHANGE, &qd->qd_flags);
1260                        qd->qd_change = qc.qc_change;
1261                        qd->qd_slot = slot;
1262                        qd->qd_slot_count = 1;
1263
1264                        spin_lock(&qd_lru_lock);
1265                        gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1266                        list_add(&qd->qd_list, &sdp->sd_quota_list);
1267                        atomic_inc(&sdp->sd_quota_count);
1268                        spin_unlock(&qd_lru_lock);
1269
1270                        found++;
1271                }
1272
1273                brelse(bh);
1274                dblock++;
1275                extlen--;
1276        }
1277
1278        if (found)
1279                fs_info(sdp, "found %u quota changes\n", found);
1280
1281        return 0;
1282
1283fail:
1284        gfs2_quota_cleanup(sdp);
1285        return error;
1286}
1287
1288void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1289{
1290        struct list_head *head = &sdp->sd_quota_list;
1291        struct gfs2_quota_data *qd;
1292        unsigned int x;
1293
1294        spin_lock(&qd_lru_lock);
1295        while (!list_empty(head)) {
1296                qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1297
1298                if (atomic_read(&qd->qd_count) > 1 ||
1299                    (atomic_read(&qd->qd_count) &&
1300                     !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1301                        list_move(&qd->qd_list, head);
1302                        spin_unlock(&qd_lru_lock);
1303                        schedule();
1304                        spin_lock(&qd_lru_lock);
1305                        continue;
1306                }
1307
1308                list_del(&qd->qd_list);
1309                /* Also remove if this qd exists in the reclaim list */
1310                if (!list_empty(&qd->qd_reclaim)) {
1311                        list_del_init(&qd->qd_reclaim);
1312                        atomic_dec(&qd_lru_count);
1313                }
1314                atomic_dec(&sdp->sd_quota_count);
1315                spin_unlock(&qd_lru_lock);
1316
1317                if (!atomic_read(&qd->qd_count)) {
1318                        gfs2_assert_warn(sdp, !qd->qd_change);
1319                        gfs2_assert_warn(sdp, !qd->qd_slot_count);
1320                } else
1321                        gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1322                gfs2_assert_warn(sdp, !qd->qd_bh_count);
1323
1324                gfs2_glock_put(qd->qd_gl);
1325                kmem_cache_free(gfs2_quotad_cachep, qd);
1326
1327                spin_lock(&qd_lru_lock);
1328        }
1329        spin_unlock(&qd_lru_lock);
1330
1331        gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1332
1333        if (sdp->sd_quota_bitmap) {
1334                for (x = 0; x < sdp->sd_quota_chunks; x++)
1335                        kfree(sdp->sd_quota_bitmap[x]);
1336                kfree(sdp->sd_quota_bitmap);
1337        }
1338}
1339
1340static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1341{
1342        if (error == 0 || error == -EROFS)
1343                return;
1344        if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1345                fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1346}
1347
1348static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1349                               int (*fxn)(struct super_block *sb, int type),
1350                               unsigned long t, unsigned long *timeo,
1351                               unsigned int *new_timeo)
1352{
1353        if (t >= *timeo) {
1354                int error = fxn(sdp->sd_vfs, 0);
1355                quotad_error(sdp, msg, error);
1356                *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1357        } else {
1358                *timeo -= t;
1359        }
1360}
1361
1362static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1363{
1364        struct gfs2_inode *ip;
1365
1366        while(1) {
1367                ip = NULL;
1368                spin_lock(&sdp->sd_trunc_lock);
1369                if (!list_empty(&sdp->sd_trunc_list)) {
1370                        ip = list_entry(sdp->sd_trunc_list.next,
1371                                        struct gfs2_inode, i_trunc_list);
1372                        list_del_init(&ip->i_trunc_list);
1373                }
1374                spin_unlock(&sdp->sd_trunc_lock);
1375                if (ip == NULL)
1376                        return;
1377                gfs2_glock_finish_truncate(ip);
1378        }
1379}
1380
1381void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1382        if (!sdp->sd_statfs_force_sync) {
1383                sdp->sd_statfs_force_sync = 1;
1384                wake_up(&sdp->sd_quota_wait);
1385        }
1386}
1387
1388
1389/**
1390 * gfs2_quotad - Write cached quota changes into the quota file
1391 * @sdp: Pointer to GFS2 superblock
1392 *
1393 */
1394
1395int gfs2_quotad(void *data)
1396{
1397        struct gfs2_sbd *sdp = data;
1398        struct gfs2_tune *tune = &sdp->sd_tune;
1399        unsigned long statfs_timeo = 0;
1400        unsigned long quotad_timeo = 0;
1401        unsigned long t = 0;
1402        DEFINE_WAIT(wait);
1403        int empty;
1404
1405        while (!kthread_should_stop()) {
1406
1407                /* Update the master statfs file */
1408                if (sdp->sd_statfs_force_sync) {
1409                        int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1410                        quotad_error(sdp, "statfs", error);
1411                        statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1412                }
1413                else
1414                        quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1415                                           &statfs_timeo,
1416                                           &tune->gt_statfs_quantum);
1417
1418                /* Update quota file */
1419                quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1420                                   &quotad_timeo, &tune->gt_quota_quantum);
1421
1422                /* Check for & recover partially truncated inodes */
1423                quotad_check_trunc_list(sdp);
1424
1425                try_to_freeze();
1426
1427                t = min(quotad_timeo, statfs_timeo);
1428
1429                prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1430                spin_lock(&sdp->sd_trunc_lock);
1431                empty = list_empty(&sdp->sd_trunc_list);
1432                spin_unlock(&sdp->sd_trunc_lock);
1433                if (empty && !sdp->sd_statfs_force_sync)
1434                        t -= schedule_timeout(t);
1435                else
1436                        t = 0;
1437                finish_wait(&sdp->sd_quota_wait, &wait);
1438        }
1439
1440        return 0;
1441}
1442
1443static int gfs2_quota_get_xstate(struct super_block *sb,
1444                                 struct fs_quota_stat *fqs)
1445{
1446        struct gfs2_sbd *sdp = sb->s_fs_info;
1447
1448        memset(fqs, 0, sizeof(struct fs_quota_stat));
1449        fqs->qs_version = FS_QSTAT_VERSION;
1450
1451        switch (sdp->sd_args.ar_quota) {
1452        case GFS2_QUOTA_ON:
1453                fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1454                /*FALLTHRU*/
1455        case GFS2_QUOTA_ACCOUNT:
1456                fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1457                break;
1458        case GFS2_QUOTA_OFF:
1459                break;
1460        }
1461
1462        if (sdp->sd_quota_inode) {
1463                fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1464                fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1465        }
1466        fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1467        fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1468        fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1469        return 0;
1470}
1471
1472static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1473                          struct fs_disk_quota *fdq)
1474{
1475        struct gfs2_sbd *sdp = sb->s_fs_info;
1476        struct gfs2_quota_lvb *qlvb;
1477        struct gfs2_quota_data *qd;
1478        struct gfs2_holder q_gh;
1479        int error;
1480
1481        memset(fdq, 0, sizeof(struct fs_disk_quota));
1482
1483        if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1484                return -ESRCH; /* Crazy XFS error code */
1485
1486        if (type == USRQUOTA)
1487                type = QUOTA_USER;
1488        else if (type == GRPQUOTA)
1489                type = QUOTA_GROUP;
1490        else
1491                return -EINVAL;
1492
1493        error = qd_get(sdp, type, id, &qd);
1494        if (error)
1495                return error;
1496        error = do_glock(qd, FORCE, &q_gh);
1497        if (error)
1498                goto out;
1499
1500        qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1501        fdq->d_version = FS_DQUOT_VERSION;
1502        fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1503        fdq->d_id = id;
1504        fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1505        fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1506        fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1507
1508        gfs2_glock_dq_uninit(&q_gh);
1509out:
1510        qd_put(qd);
1511        return error;
1512}
1513
1514/* GFS2 only supports a subset of the XFS fields */
1515#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1516
1517static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1518                          struct fs_disk_quota *fdq)
1519{
1520        struct gfs2_sbd *sdp = sb->s_fs_info;
1521        struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1522        struct gfs2_quota_data *qd;
1523        struct gfs2_holder q_gh, i_gh;
1524        unsigned int data_blocks, ind_blocks;
1525        unsigned int blocks = 0;
1526        int alloc_required;
1527        loff_t offset;
1528        int error;
1529
1530        if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1531                return -ESRCH; /* Crazy XFS error code */
1532
1533        switch(type) {
1534        case USRQUOTA:
1535                type = QUOTA_USER;
1536                if (fdq->d_flags != FS_USER_QUOTA)
1537                        return -EINVAL;
1538                break;
1539        case GRPQUOTA:
1540                type = QUOTA_GROUP;
1541                if (fdq->d_flags != FS_GROUP_QUOTA)
1542                        return -EINVAL;
1543                break;
1544        default:
1545                return -EINVAL;
1546        }
1547
1548        if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1549                return -EINVAL;
1550        if (fdq->d_id != id)
1551                return -EINVAL;
1552
1553        error = qd_get(sdp, type, id, &qd);
1554        if (error)
1555                return error;
1556
1557        error = gfs2_rs_alloc(ip);
1558        if (error)
1559                goto out_put;
1560
1561        mutex_lock(&ip->i_inode.i_mutex);
1562        error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1563        if (error)
1564                goto out_unlockput;
1565        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1566        if (error)
1567                goto out_q;
1568
1569        /* Check for existing entry, if none then alloc new blocks */
1570        error = update_qd(sdp, qd);
1571        if (error)
1572                goto out_i;
1573
1574        /* If nothing has changed, this is a no-op */
1575        if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1576            ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1577                fdq->d_fieldmask ^= FS_DQ_BSOFT;
1578
1579        if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1580            ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1581                fdq->d_fieldmask ^= FS_DQ_BHARD;
1582
1583        if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1584            ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1585                fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1586
1587        if (fdq->d_fieldmask == 0)
1588                goto out_i;
1589
1590        offset = qd2offset(qd);
1591        alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1592        if (gfs2_is_stuffed(ip))
1593                alloc_required = 1;
1594        if (alloc_required) {
1595                gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1596                                       &data_blocks, &ind_blocks);
1597                blocks = 1 + data_blocks + ind_blocks;
1598                error = gfs2_inplace_reserve(ip, blocks);
1599                if (error)
1600                        goto out_i;
1601                blocks += gfs2_rg_blocks(ip);
1602        }
1603
1604        /* Some quotas span block boundaries and can update two blocks,
1605           adding an extra block to the transaction to handle such quotas */
1606        error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1607        if (error)
1608                goto out_release;
1609
1610        /* Apply changes */
1611        error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1612
1613        gfs2_trans_end(sdp);
1614out_release:
1615        if (alloc_required)
1616                gfs2_inplace_release(ip);
1617out_i:
1618        gfs2_glock_dq_uninit(&i_gh);
1619out_q:
1620        gfs2_glock_dq_uninit(&q_gh);
1621out_unlockput:
1622        mutex_unlock(&ip->i_inode.i_mutex);
1623out_put:
1624        qd_put(qd);
1625        return error;
1626}
1627
1628const struct quotactl_ops gfs2_quotactl_ops = {
1629        .quota_sync     = gfs2_quota_sync,
1630        .get_xstate     = gfs2_quota_get_xstate,
1631        .get_dqblk      = gfs2_get_dqblk,
1632        .set_dqblk      = gfs2_set_dqblk,
1633};
1634
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