fs/gfs2/quota.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 /*
  11  * Quota change tags are associated with each transaction that allocates or
  12  * deallocates space.  Those changes are accumulated locally to each node (in a
  13  * per-node file) and then are periodically synced to the quota file.  This
  14  * avoids the bottleneck of constantly touching the quota file, but introduces
  15  * fuzziness in the current usage value of IDs that are being used on different
  16  * nodes in the cluster simultaneously.  So, it is possible for a user on
  17  * multiple nodes to overrun their quota, but that overrun is controlable.
  18  * Since quota tags are part of transactions, there is no need for a quota check
  19  * program to be run on node crashes or anything like that.
  20  *
  21  * There are couple of knobs that let the administrator manage the quota
  22  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  23  * sitting on one node before being synced to the quota file.  (The default is
  24  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  25  * of quota file syncs increases as the user moves closer to their limit.  The
  26  * more frequent the syncs, the more accurate the quota enforcement, but that
  27  * means that there is more contention between the nodes for the quota file.
  28  * The default value is one.  This sets the maximum theoretical quota overrun
  29  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  30  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  31  * number greater than one makes quota syncs more frequent and reduces the
  32  * maximum overrun.  Numbers less than one (but greater than zero) make quota
  33  * syncs less frequent.
  34  *
  35  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  36  * the quota file, so it is not being constantly read.
  37  */
  38
  39 #include <linux/sched.h>
  40 #include <linux/slab.h>
  41 #include <linux/mm.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/completion.h>
  44 #include <linux/buffer_head.h>
  45 #include <linux/sort.h>
  46 #include <linux/fs.h>
  47 #include <linux/bio.h>
  48 #include <linux/gfs2_ondisk.h>
  49 #include <linux/kthread.h>
  50 #include <linux/freezer.h>
  51 #include <linux/quota.h>
  52 #include <linux/dqblk_xfs.h>
  53
  54 #include "gfs2.h"
  55 #include "incore.h"
  56 #include "bmap.h"
  57 #include "glock.h"
  58 #include "glops.h"
  59 #include "log.h"
  60 #include "meta_io.h"
  61 #include "quota.h"
  62 #include "rgrp.h"
  63 #include "super.h"
  64 #include "trans.h"
  65 #include "inode.h"
  66 #include "util.h"
  67
  68 struct gfs2_quota_change_host {
  69         u64 qc_change;
  70         u32 qc_flags; /* GFS2_QCF_... */
  71         struct kqid qc_id;
  72 };
  73
  74 static LIST_HEAD(qd_lru_list);
  75 static atomic_t qd_lru_count = ATOMIC_INIT(0);
  76 static DEFINE_SPINLOCK(qd_lru_lock);
  77
  78 unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
  79                                   struct shrink_control *sc)
  80 {
  81         struct gfs2_quota_data *qd;
  82         struct gfs2_sbd *sdp;
  83         int nr_to_scan = sc->nr_to_scan;
  84         long freed = 0;
  85
  86         if (!(sc->gfp_mask & __GFP_FS))
  87                 return SHRINK_STOP;
  88
  89         spin_lock(&qd_lru_lock);
  90         while (nr_to_scan && !list_empty(&qd_lru_list)) {
  91                 qd = list_entry(qd_lru_list.next,
  92                                 struct gfs2_quota_data, qd_reclaim);
  93                 sdp = qd->qd_gl->gl_sbd;
  94
  95                 /* Free from the filesystem-specific list */
  96                 list_del(&qd->qd_list);
  97
  98                 gfs2_assert_warn(sdp, !qd->qd_change);
  99                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 100                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 101
 102                 gfs2_glock_put(qd->qd_gl);
 103                 atomic_dec(&sdp->sd_quota_count);
 104
 105                 /* Delete it from the common reclaim list */
 106                 list_del_init(&qd->qd_reclaim);
 107                 atomic_dec(&qd_lru_count);
 108                 spin_unlock(&qd_lru_lock);
 109                 kmem_cache_free(gfs2_quotad_cachep, qd);
 110                 spin_lock(&qd_lru_lock);
 111                 nr_to_scan--;
 112                 freed++;
 113         }
 114         spin_unlock(&qd_lru_lock);
 115         return freed;
 116 }
 117
 118 unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 119                                    struct shrink_control *sc)
 120 {
 121         return vfs_pressure_ratio(atomic_read(&qd_lru_count));
 122 }
 123
 124 static u64 qd2index(struct gfs2_quota_data *qd)
 125 {
 126         struct kqid qid = qd->qd_id;
 127         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 128                 ((qid.type == USRQUOTA) ? 0 : 1);
 129 }
 130
 131 static u64 qd2offset(struct gfs2_quota_data *qd)
 132 {
 133         u64 offset;
 134
 135         offset = qd2index(qd);
 136         offset *= sizeof(struct gfs2_quota);
 137
 138         return offset;
 139 }
 140
 141 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
 142                     struct gfs2_quota_data **qdp)
 143 {
 144         struct gfs2_quota_data *qd;
 145         int error;
 146
 147         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 148         if (!qd)
 149                 return -ENOMEM;
 150
 151         atomic_set(&qd->qd_count, 1);
 152         qd->qd_id = qid;
 153         qd->qd_slot = -1;
 154         INIT_LIST_HEAD(&qd->qd_reclaim);
 155
 156         error = gfs2_glock_get(sdp, qd2index(qd),
 157                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 158         if (error)
 159                 goto fail;
 160
 161         *qdp = qd;
 162
 163         return 0;
 164
 165 fail:
 166         kmem_cache_free(gfs2_quotad_cachep, qd);
 167         return error;
 168 }
 169
 170 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 171                   struct gfs2_quota_data **qdp)
 172 {
 173         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 174         int error, found;
 175
 176         *qdp = NULL;
 177
 178         for (;;) {
 179                 found = 0;
 180                 spin_lock(&qd_lru_lock);
 181                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 182                         if (qid_eq(qd->qd_id, qid)) {
 183                                 if (!atomic_read(&qd->qd_count) &&
 184                                     !list_empty(&qd->qd_reclaim)) {
 185                                         /* Remove it from reclaim list */
 186                                         list_del_init(&qd->qd_reclaim);
 187                                         atomic_dec(&qd_lru_count);
 188                                 }
 189                                 atomic_inc(&qd->qd_count);
 190                                 found = 1;
 191                                 break;
 192                         }
 193                 }
 194
 195                 if (!found)
 196                         qd = NULL;
 197
 198                 if (!qd && new_qd) {
 199                         qd = new_qd;
 200                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 201                         atomic_inc(&sdp->sd_quota_count);
 202                         new_qd = NULL;
 203                 }
 204
 205                 spin_unlock(&qd_lru_lock);
 206
 207                 if (qd) {
 208                         if (new_qd) {
 209                                 gfs2_glock_put(new_qd->qd_gl);
 210                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 211                         }
 212                         *qdp = qd;
 213                         return 0;
 214                 }
 215
 216                 error = qd_alloc(sdp, qid, &new_qd);
 217                 if (error)
 218                         return error;
 219         }
 220 }
 221
 222 static void qd_hold(struct gfs2_quota_data *qd)
 223 {
 224         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 225         gfs2_assert(sdp, atomic_read(&qd->qd_count));
 226         atomic_inc(&qd->qd_count);
 227 }
 228
 229 static void qd_put(struct gfs2_quota_data *qd)
 230 {
 231         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
 232                 /* Add to the reclaim list */
 233                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
 234                 atomic_inc(&qd_lru_count);
 235                 spin_unlock(&qd_lru_lock);
 236         }
 237 }
 238
 239 static int slot_get(struct gfs2_quota_data *qd)
 240 {
 241         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 242         unsigned int c, o = 0, b;
 243         unsigned char byte = 0;
 244
 245         spin_lock(&qd_lru_lock);
 246
 247         if (qd->qd_slot_count++) {
 248                 spin_unlock(&qd_lru_lock);
 249                 return 0;
 250         }
 251
 252         for (c = 0; c < sdp->sd_quota_chunks; c++)
 253                 for (o = 0; o < PAGE_SIZE; o++) {
 254                         byte = sdp->sd_quota_bitmap[c][o];
 255                         if (byte != 0xFF)
 256                                 goto found;
 257                 }
 258
 259         goto fail;
 260
 261 found:
 262         for (b = 0; b < 8; b++)
 263                 if (!(byte & (1 << b)))
 264                         break;
 265         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 266
 267         if (qd->qd_slot >= sdp->sd_quota_slots)
 268                 goto fail;
 269
 270         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 271
 272         spin_unlock(&qd_lru_lock);
 273
 274         return 0;
 275
 276 fail:
 277         qd->qd_slot_count--;
 278         spin_unlock(&qd_lru_lock);
 279         return -ENOSPC;
 280 }
 281
 282 static void slot_hold(struct gfs2_quota_data *qd)
 283 {
 284         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 285
 286         spin_lock(&qd_lru_lock);
 287         gfs2_assert(sdp, qd->qd_slot_count);
 288         qd->qd_slot_count++;
 289         spin_unlock(&qd_lru_lock);
 290 }
 291
 292 static void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 293                              unsigned int bit, int new_value)
 294 {
 295         unsigned int c, o, b = bit;
 296         int old_value;
 297
 298         c = b / (8 * PAGE_SIZE);
 299         b %= 8 * PAGE_SIZE;
 300         o = b / 8;
 301         b %= 8;
 302
 303         old_value = (bitmap[c][o] & (1 << b));
 304         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 305
 306         if (new_value)
 307                 bitmap[c][o] |= 1 << b;
 308         else
 309                 bitmap[c][o] &= ~(1 << b);
 310 }
 311
 312 static void slot_put(struct gfs2_quota_data *qd)
 313 {
 314         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 315
 316         spin_lock(&qd_lru_lock);
 317         gfs2_assert(sdp, qd->qd_slot_count);
 318         if (!--qd->qd_slot_count) {
 319                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 320                 qd->qd_slot = -1;
 321         }
 322         spin_unlock(&qd_lru_lock);
 323 }
 324
 325 static int bh_get(struct gfs2_quota_data *qd)
 326 {
 327         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 328         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 329         unsigned int block, offset;
 330         struct buffer_head *bh;
 331         int error;
 332         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 333
 334         mutex_lock(&sdp->sd_quota_mutex);
 335
 336         if (qd->qd_bh_count++) {
 337                 mutex_unlock(&sdp->sd_quota_mutex);
 338                 return 0;
 339         }
 340
 341         block = qd->qd_slot / sdp->sd_qc_per_block;
 342         offset = qd->qd_slot % sdp->sd_qc_per_block;
 343
 344         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 345         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 346         if (error)
 347                 goto fail;
 348         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 349         if (error)
 350                 goto fail;
 351         error = -EIO;
 352         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 353                 goto fail_brelse;
 354
 355         qd->qd_bh = bh;
 356         qd->qd_bh_qc = (struct gfs2_quota_change *)
 357                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 358                  offset * sizeof(struct gfs2_quota_change));
 359
 360         mutex_unlock(&sdp->sd_quota_mutex);
 361
 362         return 0;
 363
 364 fail_brelse:
 365         brelse(bh);
 366 fail:
 367         qd->qd_bh_count--;
 368         mutex_unlock(&sdp->sd_quota_mutex);
 369         return error;
 370 }
 371
 372 static void bh_put(struct gfs2_quota_data *qd)
 373 {
 374         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 375
 376         mutex_lock(&sdp->sd_quota_mutex);
 377         gfs2_assert(sdp, qd->qd_bh_count);
 378         if (!--qd->qd_bh_count) {
 379                 brelse(qd->qd_bh);
 380                 qd->qd_bh = NULL;
 381                 qd->qd_bh_qc = NULL;
 382         }
 383         mutex_unlock(&sdp->sd_quota_mutex);
 384 }
 385
 386 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 387                          u64 *sync_gen)
 388 {
 389         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 390             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 391             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 392                 return 0;
 393
 394         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 395
 396         set_bit(QDF_LOCKED, &qd->qd_flags);
 397         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
 398         atomic_inc(&qd->qd_count);
 399         qd->qd_change_sync = qd->qd_change;
 400         gfs2_assert_warn(sdp, qd->qd_slot_count);
 401         qd->qd_slot_count++;
 402         return 1;
 403 }
 404
 405 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 406 {
 407         struct gfs2_quota_data *qd = NULL;
 408         int error;
 409         int found = 0;
 410
 411         *qdp = NULL;
 412
 413         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 414                 return 0;
 415
 416         spin_lock(&qd_lru_lock);
 417
 418         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 419                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
 420                 if (found)
 421                         break;
 422         }
 423
 424         if (!found)
 425                 qd = NULL;
 426
 427         spin_unlock(&qd_lru_lock);
 428
 429         if (qd) {
 430                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 431                 error = bh_get(qd);
 432                 if (error) {
 433                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 434                         slot_put(qd);
 435                         qd_put(qd);
 436                         return error;
 437                 }
 438         }
 439
 440         *qdp = qd;
 441
 442         return 0;
 443 }
 444
 445 static void qd_unlock(struct gfs2_quota_data *qd)
 446 {
 447         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 448                          test_bit(QDF_LOCKED, &qd->qd_flags));
 449         clear_bit(QDF_LOCKED, &qd->qd_flags);
 450         bh_put(qd);
 451         slot_put(qd);
 452         qd_put(qd);
 453 }
 454
 455 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 456                     struct gfs2_quota_data **qdp)
 457 {
 458         int error;
 459
 460         error = qd_get(sdp, qid, qdp);
 461         if (error)
 462                 return error;
 463
 464         error = slot_get(*qdp);
 465         if (error)
 466                 goto fail;
 467
 468         error = bh_get(*qdp);
 469         if (error)
 470                 goto fail_slot;
 471
 472         return 0;
 473
 474 fail_slot:
 475         slot_put(*qdp);
 476 fail:
 477         qd_put(*qdp);
 478         return error;
 479 }
 480
 481 static void qdsb_put(struct gfs2_quota_data *qd)
 482 {
 483         bh_put(qd);
 484         slot_put(qd);
 485         qd_put(qd);
 486 }
 487
 488 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 489 {
 490         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 491         struct gfs2_quota_data **qd;
 492         int error;
 493
 494         if (ip->i_res == NULL) {
 495                 error = gfs2_rs_alloc(ip);
 496                 if (error)
 497                         return error;
 498         }
 499
 500         qd = ip->i_res->rs_qa_qd;
 501
 502         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
 503             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 504                 return -EIO;
 505
 506         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 507                 return 0;
 508
 509         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 510         if (error)
 511                 goto out;
 512         ip->i_res->rs_qa_qd_num++;
 513         qd++;
 514
 515         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 516         if (error)
 517                 goto out;
 518         ip->i_res->rs_qa_qd_num++;
 519         qd++;
 520
 521         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 522             !uid_eq(uid, ip->i_inode.i_uid)) {
 523                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 524                 if (error)
 525                         goto out;
 526                 ip->i_res->rs_qa_qd_num++;
 527                 qd++;
 528         }
 529
 530         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 531             !gid_eq(gid, ip->i_inode.i_gid)) {
 532                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 533                 if (error)
 534                         goto out;
 535                 ip->i_res->rs_qa_qd_num++;
 536                 qd++;
 537         }
 538
 539 out:
 540         if (error)
 541                 gfs2_quota_unhold(ip);
 542         return error;
 543 }
 544
 545 void gfs2_quota_unhold(struct gfs2_inode *ip)
 546 {
 547         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 548         unsigned int x;
 549
 550         if (ip->i_res == NULL)
 551                 return;
 552         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 553
 554         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 555                 qdsb_put(ip->i_res->rs_qa_qd[x]);
 556                 ip->i_res->rs_qa_qd[x] = NULL;
 557         }
 558         ip->i_res->rs_qa_qd_num = 0;
 559 }
 560
 561 static int sort_qd(const void *a, const void *b)
 562 {
 563         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 564         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 565
 566         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 567                 return -1;
 568         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 569                 return 1;
 570         return 0;
 571 }
 572
 573 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 574 {
 575         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 576         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 577         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 578         s64 x;
 579
 580         mutex_lock(&sdp->sd_quota_mutex);
 581         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 582
 583         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 584                 qc->qc_change = 0;
 585                 qc->qc_flags = 0;
 586                 if (qd->qd_id.type == USRQUOTA)
 587                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 588                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 589         }
 590
 591         x = be64_to_cpu(qc->qc_change) + change;
 592         qc->qc_change = cpu_to_be64(x);
 593
 594         spin_lock(&qd_lru_lock);
 595         qd->qd_change = x;
 596         spin_unlock(&qd_lru_lock);
 597
 598         if (!x) {
 599                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 600                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 601                 qc->qc_flags = 0;
 602                 qc->qc_id = 0;
 603                 slot_put(qd);
 604                 qd_put(qd);
 605         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 606                 qd_hold(qd);
 607                 slot_hold(qd);
 608         }
 609
 610         mutex_unlock(&sdp->sd_quota_mutex);
 611 }
 612
 613 /**
 614  * gfs2_adjust_quota - adjust record of current block usage
 615  * @ip: The quota inode
 616  * @loc: Offset of the entry in the quota file
 617  * @change: The amount of usage change to record
 618  * @qd: The quota data
 619  * @fdq: The updated limits to record
 620  *
 621  * This function was mostly borrowed from gfs2_block_truncate_page which was
 622  * in turn mostly borrowed from ext3
 623  *
 624  * Returns: 0 or -ve on error
 625  */
 626
 627 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 628                              s64 change, struct gfs2_quota_data *qd,
 629                              struct fs_disk_quota *fdq)
 630 {
 631         struct inode *inode = &ip->i_inode;
 632         struct gfs2_sbd *sdp = GFS2_SB(inode);
 633         struct address_space *mapping = inode->i_mapping;
 634         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 635         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 636         unsigned blocksize, iblock, pos;
 637         struct buffer_head *bh;
 638         struct page *page;
 639         void *kaddr, *ptr;
 640         struct gfs2_quota q, *qp;
 641         int err, nbytes;
 642         u64 size;
 643
 644         if (gfs2_is_stuffed(ip)) {
 645                 err = gfs2_unstuff_dinode(ip, NULL);
 646                 if (err)
 647                         return err;
 648         }
 649
 650         memset(&q, 0, sizeof(struct gfs2_quota));
 651         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 652         if (err < 0)
 653                 return err;
 654
 655         err = -EIO;
 656         qp = &q;
 657         qp->qu_value = be64_to_cpu(qp->qu_value);
 658         qp->qu_value += change;
 659         qp->qu_value = cpu_to_be64(qp->qu_value);
 660         qd->qd_qb.qb_value = qp->qu_value;
 661         if (fdq) {
 662                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
 663                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
 664                         qd->qd_qb.qb_warn = qp->qu_warn;
 665                 }
 666                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
 667                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
 668                         qd->qd_qb.qb_limit = qp->qu_limit;
 669                 }
 670                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
 671                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
 672                         qd->qd_qb.qb_value = qp->qu_value;
 673                 }
 674         }
 675
 676         /* Write the quota into the quota file on disk */
 677         ptr = qp;
 678         nbytes = sizeof(struct gfs2_quota);
 679 get_a_page:
 680         page = find_or_create_page(mapping, index, GFP_NOFS);
 681         if (!page)
 682                 return -ENOMEM;
 683
 684         blocksize = inode->i_sb->s_blocksize;
 685         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 686
 687         if (!page_has_buffers(page))
 688                 create_empty_buffers(page, blocksize, 0);
 689
 690         bh = page_buffers(page);
 691         pos = blocksize;
 692         while (offset >= pos) {
 693                 bh = bh->b_this_page;
 694                 iblock++;
 695                 pos += blocksize;
 696         }
 697
 698         if (!buffer_mapped(bh)) {
 699                 gfs2_block_map(inode, iblock, bh, 1);
 700                 if (!buffer_mapped(bh))
 701                         goto unlock_out;
 702                 /* If it's a newly allocated disk block for quota, zero it */
 703                 if (buffer_new(bh))
 704                         zero_user(page, pos - blocksize, bh->b_size);
 705         }
 706
 707         if (PageUptodate(page))
 708                 set_buffer_uptodate(bh);
 709
 710         if (!buffer_uptodate(bh)) {
 711                 ll_rw_block(READ | REQ_META, 1, &bh);
 712                 wait_on_buffer(bh);
 713                 if (!buffer_uptodate(bh))
 714                         goto unlock_out;
 715         }
 716
 717         gfs2_trans_add_data(ip->i_gl, bh);
 718
 719         kaddr = kmap_atomic(page);
 720         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
 721                 nbytes = PAGE_CACHE_SIZE - offset;
 722         memcpy(kaddr + offset, ptr, nbytes);
 723         flush_dcache_page(page);
 724         kunmap_atomic(kaddr);
 725         unlock_page(page);
 726         page_cache_release(page);
 727
 728         /* If quota straddles page boundary, we need to update the rest of the
 729          * quota at the beginning of the next page */
 730         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
 731                 ptr = ptr + nbytes;
 732                 nbytes = sizeof(struct gfs2_quota) - nbytes;
 733                 offset = 0;
 734                 index++;
 735                 goto get_a_page;
 736         }
 737
 738         size = loc + sizeof(struct gfs2_quota);
 739         if (size > inode->i_size)
 740                 i_size_write(inode, size);
 741         inode->i_mtime = inode->i_atime = CURRENT_TIME;
 742         mark_inode_dirty(inode);
 743         return 0;
 744
 745 unlock_out:
 746         unlock_page(page);
 747         page_cache_release(page);
 748         return err;
 749 }
 750
 751 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 752 {
 753         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 754         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 755         struct gfs2_alloc_parms ap = { .aflags = 0, };
 756         unsigned int data_blocks, ind_blocks;
 757         struct gfs2_holder *ghs, i_gh;
 758         unsigned int qx, x;
 759         struct gfs2_quota_data *qd;
 760         unsigned reserved;
 761         loff_t offset;
 762         unsigned int nalloc = 0, blocks;
 763         int error;
 764
 765         error = gfs2_rs_alloc(ip);
 766         if (error)
 767                 return error;
 768
 769         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 770                               &data_blocks, &ind_blocks);
 771
 772         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 773         if (!ghs)
 774                 return -ENOMEM;
 775
 776         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 777         mutex_lock(&ip->i_inode.i_mutex);
 778         for (qx = 0; qx < num_qd; qx++) {
 779                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 780                                            GL_NOCACHE, &ghs[qx]);
 781                 if (error)
 782                         goto out;
 783         }
 784
 785         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 786         if (error)
 787                 goto out;
 788
 789         for (x = 0; x < num_qd; x++) {
 790                 offset = qd2offset(qda[x]);
 791                 if (gfs2_write_alloc_required(ip, offset,
 792                                               sizeof(struct gfs2_quota)))
 793                         nalloc++;
 794         }
 795
 796         /*
 797          * 1 blk for unstuffing inode if stuffed. We add this extra
 798          * block to the reservation unconditionally. If the inode
 799          * doesn't need unstuffing, the block will be released to the
 800          * rgrp since it won't be allocated during the transaction
 801          */
 802         /* +3 in the end for unstuffing block, inode size update block
 803          * and another block in case quota straddles page boundary and
 804          * two blocks need to be updated instead of 1 */
 805         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 806
 807         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 808         ap.target = reserved;
 809         error = gfs2_inplace_reserve(ip, &ap);
 810         if (error)
 811                 goto out_alloc;
 812
 813         if (nalloc)
 814                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 815
 816         error = gfs2_trans_begin(sdp, blocks, 0);
 817         if (error)
 818                 goto out_ipres;
 819
 820         for (x = 0; x < num_qd; x++) {
 821                 qd = qda[x];
 822                 offset = qd2offset(qd);
 823                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 824                 if (error)
 825                         goto out_end_trans;
 826
 827                 do_qc(qd, -qd->qd_change_sync);
 828                 set_bit(QDF_REFRESH, &qd->qd_flags);
 829         }
 830
 831         error = 0;
 832
 833 out_end_trans:
 834         gfs2_trans_end(sdp);
 835 out_ipres:
 836         gfs2_inplace_release(ip);
 837 out_alloc:
 838         gfs2_glock_dq_uninit(&i_gh);
 839 out:
 840         while (qx--)
 841                 gfs2_glock_dq_uninit(&ghs[qx]);
 842         mutex_unlock(&ip->i_inode.i_mutex);
 843         kfree(ghs);
 844         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 845         return error;
 846 }
 847
 848 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 849 {
 850         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 851         struct gfs2_quota q;
 852         struct gfs2_quota_lvb *qlvb;
 853         loff_t pos;
 854         int error;
 855
 856         memset(&q, 0, sizeof(struct gfs2_quota));
 857         pos = qd2offset(qd);
 858         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 859         if (error < 0)
 860                 return error;
 861
 862         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 863         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 864         qlvb->__pad = 0;
 865         qlvb->qb_limit = q.qu_limit;
 866         qlvb->qb_warn = q.qu_warn;
 867         qlvb->qb_value = q.qu_value;
 868         qd->qd_qb = *qlvb;
 869
 870         return 0;
 871 }
 872
 873 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 874                     struct gfs2_holder *q_gh)
 875 {
 876         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 877         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 878         struct gfs2_holder i_gh;
 879         int error;
 880
 881 restart:
 882         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 883         if (error)
 884                 return error;
 885
 886         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 887
 888         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 889                 gfs2_glock_dq_uninit(q_gh);
 890                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
 891                                            GL_NOCACHE, q_gh);
 892                 if (error)
 893                         return error;
 894
 895                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 896                 if (error)
 897                         goto fail;
 898
 899                 error = update_qd(sdp, qd);
 900                 if (error)
 901                         goto fail_gunlock;
 902
 903                 gfs2_glock_dq_uninit(&i_gh);
 904                 gfs2_glock_dq_uninit(q_gh);
 905                 force_refresh = 0;
 906                 goto restart;
 907         }
 908
 909         return 0;
 910
 911 fail_gunlock:
 912         gfs2_glock_dq_uninit(&i_gh);
 913 fail:
 914         gfs2_glock_dq_uninit(q_gh);
 915         return error;
 916 }
 917
 918 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 919 {
 920         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 921         struct gfs2_quota_data *qd;
 922         unsigned int x;
 923         int error = 0;
 924
 925         error = gfs2_quota_hold(ip, uid, gid);
 926         if (error)
 927                 return error;
 928
 929         if (capable(CAP_SYS_RESOURCE) ||
 930             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 931                 return 0;
 932
 933         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
 934              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 935
 936         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
 937                 int force = NO_FORCE;
 938                 qd = ip->i_res->rs_qa_qd[x];
 939                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
 940                         force = FORCE;
 941                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
 942                 if (error)
 943                         break;
 944         }
 945
 946         if (!error)
 947                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 948         else {
 949                 while (x--)
 950                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
 951                 gfs2_quota_unhold(ip);
 952         }
 953
 954         return error;
 955 }
 956
 957 static int need_sync(struct gfs2_quota_data *qd)
 958 {
 959         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 960         struct gfs2_tune *gt = &sdp->sd_tune;
 961         s64 value;
 962         unsigned int num, den;
 963         int do_sync = 1;
 964
 965         if (!qd->qd_qb.qb_limit)
 966                 return 0;
 967
 968         spin_lock(&qd_lru_lock);
 969         value = qd->qd_change;
 970         spin_unlock(&qd_lru_lock);
 971
 972         spin_lock(&gt->gt_spin);
 973         num = gt->gt_quota_scale_num;
 974         den = gt->gt_quota_scale_den;
 975         spin_unlock(&gt->gt_spin);
 976
 977         if (value < 0)
 978                 do_sync = 0;
 979         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 980                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 981                 do_sync = 0;
 982         else {
 983                 value *= gfs2_jindex_size(sdp) * num;
 984                 value = div_s64(value, den);
 985                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 986                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 987                         do_sync = 0;
 988         }
 989
 990         return do_sync;
 991 }
 992
 993 void gfs2_quota_unlock(struct gfs2_inode *ip)
 994 {
 995         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 996         struct gfs2_quota_data *qda[4];
 997         unsigned int count = 0;
 998         unsigned int x;
 999         int found;
1000
1001         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1002                 goto out;
1003
1004         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1005                 struct gfs2_quota_data *qd;
1006                 int sync;
1007
1008                 qd = ip->i_res->rs_qa_qd[x];
1009                 sync = need_sync(qd);
1010
1011                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1012                 if (!sync)
1013                         continue;
1014
1015                 spin_lock(&qd_lru_lock);
1016                 found = qd_check_sync(sdp, qd, NULL);
1017                 spin_unlock(&qd_lru_lock);
1018
1019                 if (!found)
1020                         continue;
1021
1022                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1023                 if (bh_get(qd)) {
1024                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1025                         slot_put(qd);
1026                         qd_put(qd);
1027                         continue;
1028                 }
1029
1030                 qda[count++] = qd;
1031         }
1032
1033         if (count) {
1034                 do_sync(count, qda);
1035                 for (x = 0; x < count; x++)
1036                         qd_unlock(qda[x]);
1037         }
1038
1039 out:
1040         gfs2_quota_unhold(ip);
1041 }
1042
1043 #define MAX_LINE 256
1044
1045 static int print_message(struct gfs2_quota_data *qd, char *type)
1046 {
1047         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1048
1049         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1050                sdp->sd_fsname, type,
1051                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1052                from_kqid(&init_user_ns, qd->qd_id));
1053
1054         return 0;
1055 }
1056
1057 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1058 {
1059         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1060         struct gfs2_quota_data *qd;
1061         s64 value;
1062         unsigned int x;
1063         int error = 0;
1064
1065         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1066                 return 0;
1067
1068         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1069                 return 0;
1070
1071         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1072                 qd = ip->i_res->rs_qa_qd[x];
1073
1074                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1075                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1076                         continue;
1077
1078                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1079                 spin_lock(&qd_lru_lock);
1080                 value += qd->qd_change;
1081                 spin_unlock(&qd_lru_lock);
1082
1083                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1084                         print_message(qd, "exceeded");
1085                         quota_send_warning(qd->qd_id,
1086                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1087
1088                         error = -EDQUOT;
1089                         break;
1090                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1091                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1092                            time_after_eq(jiffies, qd->qd_last_warn +
1093                                          gfs2_tune_get(sdp,
1094                                                 gt_quota_warn_period) * HZ)) {
1095                         quota_send_warning(qd->qd_id,
1096                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1097                         error = print_message(qd, "warning");
1098                         qd->qd_last_warn = jiffies;
1099                 }
1100         }
1101
1102         return error;
1103 }
1104
1105 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1106                        kuid_t uid, kgid_t gid)
1107 {
1108         struct gfs2_quota_data *qd;
1109         unsigned int x;
1110
1111         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1112                 return;
1113         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1114                 return;
1115
1116         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1117                 qd = ip->i_res->rs_qa_qd[x];
1118
1119                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1120                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1121                         do_qc(qd, change);
1122                 }
1123         }
1124 }
1125
1126 int gfs2_quota_sync(struct super_block *sb, int type)
1127 {
1128         struct gfs2_sbd *sdp = sb->s_fs_info;
1129         struct gfs2_quota_data **qda;
1130         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1131         unsigned int num_qd;
1132         unsigned int x;
1133         int error = 0;
1134
1135         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1136         if (!qda)
1137                 return -ENOMEM;
1138
1139         mutex_lock(&sdp->sd_quota_sync_mutex);
1140         sdp->sd_quota_sync_gen++;
1141
1142         do {
1143                 num_qd = 0;
1144
1145                 for (;;) {
1146                         error = qd_fish(sdp, qda + num_qd);
1147                         if (error || !qda[num_qd])
1148                                 break;
1149                         if (++num_qd == max_qd)
1150                                 break;
1151                 }
1152
1153                 if (num_qd) {
1154                         if (!error)
1155                                 error = do_sync(num_qd, qda);
1156                         if (!error)
1157                                 for (x = 0; x < num_qd; x++)
1158                                         qda[x]->qd_sync_gen =
1159                                                 sdp->sd_quota_sync_gen;
1160
1161                         for (x = 0; x < num_qd; x++)
1162                                 qd_unlock(qda[x]);
1163                 }
1164         } while (!error && num_qd == max_qd);
1165
1166         mutex_unlock(&sdp->sd_quota_sync_mutex);
1167         kfree(qda);
1168
1169         return error;
1170 }
1171
1172 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1173 {
1174         struct gfs2_quota_data *qd;
1175         struct gfs2_holder q_gh;
1176         int error;
1177
1178         error = qd_get(sdp, qid, &qd);
1179         if (error)
1180                 return error;
1181
1182         error = do_glock(qd, FORCE, &q_gh);
1183         if (!error)
1184                 gfs2_glock_dq_uninit(&q_gh);
1185
1186         qd_put(qd);
1187         return error;
1188 }
1189
1190 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1191 {
1192         const struct gfs2_quota_change *str = buf;
1193
1194         qc->qc_change = be64_to_cpu(str->qc_change);
1195         qc->qc_flags = be32_to_cpu(str->qc_flags);
1196         qc->qc_id = make_kqid(&init_user_ns,
1197                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1198                               be32_to_cpu(str->qc_id));
1199 }
1200
1201 int gfs2_quota_init(struct gfs2_sbd *sdp)
1202 {
1203         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1204         u64 size = i_size_read(sdp->sd_qc_inode);
1205         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1206         unsigned int x, slot = 0;
1207         unsigned int found = 0;
1208         u64 dblock;
1209         u32 extlen = 0;
1210         int error;
1211
1212         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1213                 return -EIO;
1214
1215         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1216         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1217
1218         error = -ENOMEM;
1219
1220         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1221                                        sizeof(unsigned char *), GFP_NOFS);
1222         if (!sdp->sd_quota_bitmap)
1223                 return error;
1224
1225         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1226                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1227                 if (!sdp->sd_quota_bitmap[x])
1228                         goto fail;
1229         }
1230
1231         for (x = 0; x < blocks; x++) {
1232                 struct buffer_head *bh;
1233                 unsigned int y;
1234
1235                 if (!extlen) {
1236                         int new = 0;
1237                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1238                         if (error)
1239                                 goto fail;
1240                 }
1241                 error = -EIO;
1242                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1243                 if (!bh)
1244                         goto fail;
1245                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1246                         brelse(bh);
1247                         goto fail;
1248                 }
1249
1250                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1251                      y++, slot++) {
1252                         struct gfs2_quota_change_host qc;
1253                         struct gfs2_quota_data *qd;
1254
1255                         gfs2_quota_change_in(&qc, bh->b_data +
1256                                           sizeof(struct gfs2_meta_header) +
1257                                           y * sizeof(struct gfs2_quota_change));
1258                         if (!qc.qc_change)
1259                                 continue;
1260
1261                         error = qd_alloc(sdp, qc.qc_id, &qd);
1262                         if (error) {
1263                                 brelse(bh);
1264                                 goto fail;
1265                         }
1266
1267                         set_bit(QDF_CHANGE, &qd->qd_flags);
1268                         qd->qd_change = qc.qc_change;
1269                         qd->qd_slot = slot;
1270                         qd->qd_slot_count = 1;
1271
1272                         spin_lock(&qd_lru_lock);
1273                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1274                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1275                         atomic_inc(&sdp->sd_quota_count);
1276                         spin_unlock(&qd_lru_lock);
1277
1278                         found++;
1279                 }
1280
1281                 brelse(bh);
1282                 dblock++;
1283                 extlen--;
1284         }
1285
1286         if (found)
1287                 fs_info(sdp, "found %u quota changes\n", found);
1288
1289         return 0;
1290
1291 fail:
1292         gfs2_quota_cleanup(sdp);
1293         return error;
1294 }
1295
1296 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1297 {
1298         struct list_head *head = &sdp->sd_quota_list;
1299         struct gfs2_quota_data *qd;
1300         unsigned int x;
1301
1302         spin_lock(&qd_lru_lock);
1303         while (!list_empty(head)) {
1304                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1305
1306                 if (atomic_read(&qd->qd_count) > 1 ||
1307                     (atomic_read(&qd->qd_count) &&
1308                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1309                         list_move(&qd->qd_list, head);
1310                         spin_unlock(&qd_lru_lock);
1311                         schedule();
1312                         spin_lock(&qd_lru_lock);
1313                         continue;
1314                 }
1315
1316                 list_del(&qd->qd_list);
1317                 /* Also remove if this qd exists in the reclaim list */
1318                 if (!list_empty(&qd->qd_reclaim)) {
1319                         list_del_init(&qd->qd_reclaim);
1320                         atomic_dec(&qd_lru_count);
1321                 }
1322                 atomic_dec(&sdp->sd_quota_count);
1323                 spin_unlock(&qd_lru_lock);
1324
1325                 if (!atomic_read(&qd->qd_count)) {
1326                         gfs2_assert_warn(sdp, !qd->qd_change);
1327                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1328                 } else
1329                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1330                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1331
1332                 gfs2_glock_put(qd->qd_gl);
1333                 kmem_cache_free(gfs2_quotad_cachep, qd);
1334
1335                 spin_lock(&qd_lru_lock);
1336         }
1337         spin_unlock(&qd_lru_lock);
1338
1339         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1340
1341         if (sdp->sd_quota_bitmap) {
1342                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1343                         kfree(sdp->sd_quota_bitmap[x]);
1344                 kfree(sdp->sd_quota_bitmap);
1345         }
1346 }
1347
1348 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1349 {
1350         if (error == 0 || error == -EROFS)
1351                 return;
1352         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1353                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1354 }
1355
1356 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1357                                int (*fxn)(struct super_block *sb, int type),
1358                                unsigned long t, unsigned long *timeo,
1359                                unsigned int *new_timeo)
1360 {
1361         if (t >= *timeo) {
1362                 int error = fxn(sdp->sd_vfs, 0);
1363                 quotad_error(sdp, msg, error);
1364                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1365         } else {
1366                 *timeo -= t;
1367         }
1368 }
1369
1370 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1371 {
1372         struct gfs2_inode *ip;
1373
1374         while(1) {
1375                 ip = NULL;
1376                 spin_lock(&sdp->sd_trunc_lock);
1377                 if (!list_empty(&sdp->sd_trunc_list)) {
1378                         ip = list_entry(sdp->sd_trunc_list.next,
1379                                         struct gfs2_inode, i_trunc_list);
1380                         list_del_init(&ip->i_trunc_list);
1381                 }
1382                 spin_unlock(&sdp->sd_trunc_lock);
1383                 if (ip == NULL)
1384                         return;
1385                 gfs2_glock_finish_truncate(ip);
1386         }
1387 }
1388
1389 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1390         if (!sdp->sd_statfs_force_sync) {
1391                 sdp->sd_statfs_force_sync = 1;
1392                 wake_up(&sdp->sd_quota_wait);
1393         }
1394 }
1395
1396
1397 /**
1398  * gfs2_quotad - Write cached quota changes into the quota file
1399  * @sdp: Pointer to GFS2 superblock
1400  *
1401  */
1402
1403 int gfs2_quotad(void *data)
1404 {
1405         struct gfs2_sbd *sdp = data;
1406         struct gfs2_tune *tune = &sdp->sd_tune;
1407         unsigned long statfs_timeo = 0;
1408         unsigned long quotad_timeo = 0;
1409         unsigned long t = 0;
1410         DEFINE_WAIT(wait);
1411         int empty;
1412
1413         while (!kthread_should_stop()) {
1414
1415                 /* Update the master statfs file */
1416                 if (sdp->sd_statfs_force_sync) {
1417                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1418                         quotad_error(sdp, "statfs", error);
1419                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1420                 }
1421                 else
1422                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1423                                            &statfs_timeo,
1424                                            &tune->gt_statfs_quantum);
1425
1426                 /* Update quota file */
1427                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1428                                    &quotad_timeo, &tune->gt_quota_quantum);
1429
1430                 /* Check for & recover partially truncated inodes */
1431                 quotad_check_trunc_list(sdp);
1432
1433                 try_to_freeze();
1434
1435                 t = min(quotad_timeo, statfs_timeo);
1436
1437                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1438                 spin_lock(&sdp->sd_trunc_lock);
1439                 empty = list_empty(&sdp->sd_trunc_list);
1440                 spin_unlock(&sdp->sd_trunc_lock);
1441                 if (empty && !sdp->sd_statfs_force_sync)
1442                         t -= schedule_timeout(t);
1443                 else
1444                         t = 0;
1445                 finish_wait(&sdp->sd_quota_wait, &wait);
1446         }
1447
1448         return 0;
1449 }
1450
1451 static int gfs2_quota_get_xstate(struct super_block *sb,
1452                                  struct fs_quota_stat *fqs)
1453 {
1454         struct gfs2_sbd *sdp = sb->s_fs_info;
1455
1456         memset(fqs, 0, sizeof(struct fs_quota_stat));
1457         fqs->qs_version = FS_QSTAT_VERSION;
1458
1459         switch (sdp->sd_args.ar_quota) {
1460         case GFS2_QUOTA_ON:
1461                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1462                 /*FALLTHRU*/
1463         case GFS2_QUOTA_ACCOUNT:
1464                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1465                 break;
1466         case GFS2_QUOTA_OFF:
1467                 break;
1468         }
1469
1470         if (sdp->sd_quota_inode) {
1471                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1472                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1473         }
1474         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1475         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1476         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1477         return 0;
1478 }
1479
1480 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1481                           struct fs_disk_quota *fdq)
1482 {
1483         struct gfs2_sbd *sdp = sb->s_fs_info;
1484         struct gfs2_quota_lvb *qlvb;
1485         struct gfs2_quota_data *qd;
1486         struct gfs2_holder q_gh;
1487         int error;
1488
1489         memset(fdq, 0, sizeof(struct fs_disk_quota));
1490
1491         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1492                 return -ESRCH; /* Crazy XFS error code */
1493
1494         if ((qid.type != USRQUOTA) &&
1495             (qid.type != GRPQUOTA))
1496                 return -EINVAL;
1497
1498         error = qd_get(sdp, qid, &qd);
1499         if (error)
1500                 return error;
1501         error = do_glock(qd, FORCE, &q_gh);
1502         if (error)
1503                 goto out;
1504
1505         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1506         fdq->d_version = FS_DQUOT_VERSION;
1507         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1508         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1509         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1510         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1511         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1512
1513         gfs2_glock_dq_uninit(&q_gh);
1514 out:
1515         qd_put(qd);
1516         return error;
1517 }
1518
1519 /* GFS2 only supports a subset of the XFS fields */
1520 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1521
1522 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1523                           struct fs_disk_quota *fdq)
1524 {
1525         struct gfs2_sbd *sdp = sb->s_fs_info;
1526         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1527         struct gfs2_quota_data *qd;
1528         struct gfs2_holder q_gh, i_gh;
1529         unsigned int data_blocks, ind_blocks;
1530         unsigned int blocks = 0;
1531         int alloc_required;
1532         loff_t offset;
1533         int error;
1534
1535         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1536                 return -ESRCH; /* Crazy XFS error code */
1537
1538         if ((qid.type != USRQUOTA) &&
1539             (qid.type != GRPQUOTA))
1540                 return -EINVAL;
1541
1542         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1543                 return -EINVAL;
1544
1545         error = qd_get(sdp, qid, &qd);
1546         if (error)
1547                 return error;
1548
1549         error = gfs2_rs_alloc(ip);
1550         if (error)
1551                 goto out_put;
1552
1553         mutex_lock(&ip->i_inode.i_mutex);
1554         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1555         if (error)
1556                 goto out_unlockput;
1557         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1558         if (error)
1559                 goto out_q;
1560
1561         /* Check for existing entry, if none then alloc new blocks */
1562         error = update_qd(sdp, qd);
1563         if (error)
1564                 goto out_i;
1565
1566         /* If nothing has changed, this is a no-op */
1567         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1568             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1569                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1570
1571         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1572             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1573                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1574
1575         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1576             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1577                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1578
1579         if (fdq->d_fieldmask == 0)
1580                 goto out_i;
1581
1582         offset = qd2offset(qd);
1583         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1584         if (gfs2_is_stuffed(ip))
1585                 alloc_required = 1;
1586         if (alloc_required) {
1587                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1588                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1589                                        &data_blocks, &ind_blocks);
1590                 blocks = 1 + data_blocks + ind_blocks;
1591                 ap.target = blocks;
1592                 error = gfs2_inplace_reserve(ip, &ap);
1593                 if (error)
1594                         goto out_i;
1595                 blocks += gfs2_rg_blocks(ip, blocks);
1596         }
1597
1598         /* Some quotas span block boundaries and can update two blocks,
1599            adding an extra block to the transaction to handle such quotas */
1600         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1601         if (error)
1602                 goto out_release;
1603
1604         /* Apply changes */
1605         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1606
1607         gfs2_trans_end(sdp);
1608 out_release:
1609         if (alloc_required)
1610                 gfs2_inplace_release(ip);
1611 out_i:
1612         gfs2_glock_dq_uninit(&i_gh);
1613 out_q:
1614         gfs2_glock_dq_uninit(&q_gh);
1615 out_unlockput:
1616         mutex_unlock(&ip->i_inode.i_mutex);
1617 out_put:
1618         qd_put(qd);
1619         return error;
1620 }
1621
1622 const struct quotactl_ops gfs2_quotactl_ops = {
1623         .quota_sync     = gfs2_quota_sync,
1624         .get_xstate     = gfs2_quota_get_xstate,
1625         .get_dqblk      = gfs2_get_dqblk,
1626         .set_dqblk      = gfs2_set_dqblk,
1627 };