fs/gfs2/quota.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.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 to 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/spinlock.h>
  42 #include <linux/completion.h>
  43 #include <linux/buffer_head.h>
  44 #include <linux/tty.h>
  45 #include <linux/sort.h>
  46 #include <linux/fs.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <asm/semaphore.h>
  49
  50 #include "gfs2.h"
  51 #include "lm_interface.h"
  52 #include "incore.h"
  53 #include "bmap.h"
  54 #include "glock.h"
  55 #include "glops.h"
  56 #include "log.h"
  57 #include "lvb.h"
  58 #include "meta_io.h"
  59 #include "quota.h"
  60 #include "rgrp.h"
  61 #include "super.h"
  62 #include "trans.h"
  63 #include "inode.h"
  64 #include "ops_file.h"
  65 #include "ops_address.h"
  66 #include "util.h"
  67
  68 #define QUOTA_USER 1
  69 #define QUOTA_GROUP 0
  70
  71 static uint64_t qd2offset(struct gfs2_quota_data *qd)
  72 {
  73         uint64_t offset;
  74
  75         offset = 2 * (uint64_t)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
  76         offset *= sizeof(struct gfs2_quota);
  77
  78         return offset;
  79 }
  80
  81 static int qd_alloc(struct gfs2_sbd *sdp, int user, uint32_t id,
  82                     struct gfs2_quota_data **qdp)
  83 {
  84         struct gfs2_quota_data *qd;
  85         int error;
  86
  87         qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
  88         if (!qd)
  89                 return -ENOMEM;
  90
  91         qd->qd_count = 1;
  92         qd->qd_id = id;
  93         if (user)
  94                 set_bit(QDF_USER, &qd->qd_flags);
  95         qd->qd_slot = -1;
  96
  97         error = gfs2_glock_get(sdp, 2 * (uint64_t)id + !user,
  98                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
  99         if (error)
 100                 goto fail;
 101
 102         error = gfs2_lvb_hold(qd->qd_gl);
 103         gfs2_glock_put(qd->qd_gl);
 104         if (error)
 105                 goto fail;
 106
 107         *qdp = qd;
 108
 109         return 0;
 110
 111  fail:
 112         kfree(qd);
 113         return error;
 114 }
 115
 116 static int qd_get(struct gfs2_sbd *sdp, int user, uint32_t id, int create,
 117                   struct gfs2_quota_data **qdp)
 118 {
 119         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 120         int error, found;
 121
 122         *qdp = NULL;
 123
 124         for (;;) {
 125                 found = 0;
 126                 spin_lock(&sdp->sd_quota_spin);
 127                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 128                         if (qd->qd_id == id &&
 129                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 130                                 qd->qd_count++;
 131                                 found = 1;
 132                                 break;
 133                         }
 134                 }
 135
 136                 if (!found)
 137                         qd = NULL;
 138
 139                 if (!qd && new_qd) {
 140                         qd = new_qd;
 141                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 142                         atomic_inc(&sdp->sd_quota_count);
 143                         new_qd = NULL;
 144                 }
 145
 146                 spin_unlock(&sdp->sd_quota_spin);
 147
 148                 if (qd || !create) {
 149                         if (new_qd) {
 150                                 gfs2_lvb_unhold(new_qd->qd_gl);
 151                                 kfree(new_qd);
 152                         }
 153                         *qdp = qd;
 154                         return 0;
 155                 }
 156
 157                 error = qd_alloc(sdp, user, id, &new_qd);
 158                 if (error)
 159                         return error;
 160         }
 161 }
 162
 163 static void qd_hold(struct gfs2_quota_data *qd)
 164 {
 165         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 166
 167         spin_lock(&sdp->sd_quota_spin);
 168         gfs2_assert(sdp, qd->qd_count);
 169         qd->qd_count++;
 170         spin_unlock(&sdp->sd_quota_spin);
 171 }
 172
 173 static void qd_put(struct gfs2_quota_data *qd)
 174 {
 175         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 176         spin_lock(&sdp->sd_quota_spin);
 177         gfs2_assert(sdp, qd->qd_count);
 178         if (!--qd->qd_count)
 179                 qd->qd_last_touched = jiffies;
 180         spin_unlock(&sdp->sd_quota_spin);
 181 }
 182
 183 static int slot_get(struct gfs2_quota_data *qd)
 184 {
 185         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 186         unsigned int c, o = 0, b;
 187         unsigned char byte = 0;
 188
 189         spin_lock(&sdp->sd_quota_spin);
 190
 191         if (qd->qd_slot_count++) {
 192                 spin_unlock(&sdp->sd_quota_spin);
 193                 return 0;
 194         }
 195
 196         for (c = 0; c < sdp->sd_quota_chunks; c++)
 197                 for (o = 0; o < PAGE_SIZE; o++) {
 198                         byte = sdp->sd_quota_bitmap[c][o];
 199                         if (byte != 0xFF)
 200                                 goto found;
 201                 }
 202
 203         goto fail;
 204
 205  found:
 206         for (b = 0; b < 8; b++)
 207                 if (!(byte & (1 << b)))
 208                         break;
 209         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 210
 211         if (qd->qd_slot >= sdp->sd_quota_slots)
 212                 goto fail;
 213
 214         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 215
 216         spin_unlock(&sdp->sd_quota_spin);
 217
 218         return 0;
 219
 220  fail:
 221         qd->qd_slot_count--;
 222         spin_unlock(&sdp->sd_quota_spin);
 223         return -ENOSPC;
 224 }
 225
 226 static void slot_hold(struct gfs2_quota_data *qd)
 227 {
 228         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 229
 230         spin_lock(&sdp->sd_quota_spin);
 231         gfs2_assert(sdp, qd->qd_slot_count);
 232         qd->qd_slot_count++;
 233         spin_unlock(&sdp->sd_quota_spin);
 234 }
 235
 236 static void slot_put(struct gfs2_quota_data *qd)
 237 {
 238         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 239
 240         spin_lock(&sdp->sd_quota_spin);
 241         gfs2_assert(sdp, qd->qd_slot_count);
 242         if (!--qd->qd_slot_count) {
 243                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 244                 qd->qd_slot = -1;
 245         }
 246         spin_unlock(&sdp->sd_quota_spin);
 247 }
 248
 249 static int bh_get(struct gfs2_quota_data *qd)
 250 {
 251         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 252         struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
 253         unsigned int block, offset;
 254         uint64_t dblock;
 255         int new = 0;
 256         struct buffer_head *bh;
 257         int error;
 258         int boundary;
 259
 260         mutex_lock(&sdp->sd_quota_mutex);
 261
 262         if (qd->qd_bh_count++) {
 263                 mutex_unlock(&sdp->sd_quota_mutex);
 264                 return 0;
 265         }
 266
 267         block = qd->qd_slot / sdp->sd_qc_per_block;
 268         offset = qd->qd_slot % sdp->sd_qc_per_block;;
 269
 270         error = gfs2_block_map(ip->i_vnode, block, &new, &dblock, &boundary);
 271         if (error)
 272                 goto fail;
 273         error = gfs2_meta_read(ip->i_gl, dblock, DIO_START | DIO_WAIT, &bh);
 274         if (error)
 275                 goto fail;
 276         error = -EIO;
 277         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 278                 goto fail_brelse;
 279
 280         qd->qd_bh = bh;
 281         qd->qd_bh_qc = (struct gfs2_quota_change *)
 282                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 283                  offset * sizeof(struct gfs2_quota_change));
 284
 285         mutex_lock(&sdp->sd_quota_mutex);
 286
 287         return 0;
 288
 289  fail_brelse:
 290         brelse(bh);
 291
 292  fail:
 293         qd->qd_bh_count--;
 294         mutex_unlock(&sdp->sd_quota_mutex);
 295         return error;
 296 }
 297
 298 static void bh_put(struct gfs2_quota_data *qd)
 299 {
 300         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 301
 302         mutex_lock(&sdp->sd_quota_mutex);
 303         gfs2_assert(sdp, qd->qd_bh_count);
 304         if (!--qd->qd_bh_count) {
 305                 brelse(qd->qd_bh);
 306                 qd->qd_bh = NULL;
 307                 qd->qd_bh_qc = NULL;
 308         }
 309         mutex_unlock(&sdp->sd_quota_mutex);
 310 }
 311
 312 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 313 {
 314         struct gfs2_quota_data *qd = NULL;
 315         int error;
 316         int found = 0;
 317
 318         *qdp = NULL;
 319
 320         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 321                 return 0;
 322
 323         spin_lock(&sdp->sd_quota_spin);
 324
 325         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 326                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 327                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 328                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 329                         continue;
 330
 331                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 332
 333                 set_bit(QDF_LOCKED, &qd->qd_flags);
 334                 gfs2_assert_warn(sdp, qd->qd_count);
 335                 qd->qd_count++;
 336                 qd->qd_change_sync = qd->qd_change;
 337                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 338                 qd->qd_slot_count++;
 339                 found = 1;
 340
 341                 break;
 342         }
 343
 344         if (!found)
 345                 qd = NULL;
 346
 347         spin_unlock(&sdp->sd_quota_spin);
 348
 349         if (qd) {
 350                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 351                 error = bh_get(qd);
 352                 if (error) {
 353                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 354                         slot_put(qd);
 355                         qd_put(qd);
 356                         return error;
 357                 }
 358         }
 359
 360         *qdp = qd;
 361
 362         return 0;
 363 }
 364
 365 static int qd_trylock(struct gfs2_quota_data *qd)
 366 {
 367         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 368
 369         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 370                 return 0;
 371
 372         spin_lock(&sdp->sd_quota_spin);
 373
 374         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 375             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 376                 spin_unlock(&sdp->sd_quota_spin);
 377                 return 0;
 378         }
 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, qd->qd_count);
 384         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
 389         spin_unlock(&sdp->sd_quota_spin);
 390
 391         gfs2_assert_warn(sdp, qd->qd_change_sync);
 392         if (bh_get(qd)) {
 393                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 394                 slot_put(qd);
 395                 qd_put(qd);
 396                 return 0;
 397         }
 398
 399         return 1;
 400 }
 401
 402 static void qd_unlock(struct gfs2_quota_data *qd)
 403 {
 404         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 405                          test_bit(QDF_LOCKED, &qd->qd_flags));
 406         clear_bit(QDF_LOCKED, &qd->qd_flags);
 407         bh_put(qd);
 408         slot_put(qd);
 409         qd_put(qd);
 410 }
 411
 412 static int qdsb_get(struct gfs2_sbd *sdp, int user, uint32_t id, int create,
 413                     struct gfs2_quota_data **qdp)
 414 {
 415         int error;
 416
 417         error = qd_get(sdp, user, id, create, qdp);
 418         if (error)
 419                 return error;
 420
 421         error = slot_get(*qdp);
 422         if (error)
 423                 goto fail;
 424
 425         error = bh_get(*qdp);
 426         if (error)
 427                 goto fail_slot;
 428
 429         return 0;
 430
 431  fail_slot:
 432         slot_put(*qdp);
 433
 434  fail:
 435         qd_put(*qdp);
 436         return error;
 437 }
 438
 439 static void qdsb_put(struct gfs2_quota_data *qd)
 440 {
 441         bh_put(qd);
 442         slot_put(qd);
 443         qd_put(qd);
 444 }
 445
 446 int gfs2_quota_hold(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 447 {
 448         struct gfs2_sbd *sdp = ip->i_sbd;
 449         struct gfs2_alloc *al = &ip->i_alloc;
 450         struct gfs2_quota_data **qd = al->al_qd;
 451         int error;
 452
 453         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
 454             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 455                 return -EIO;
 456
 457         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 458                 return 0;
 459
 460         error = qdsb_get(sdp, QUOTA_USER, ip->i_di.di_uid, CREATE, qd);
 461         if (error)
 462                 goto out;
 463         al->al_qd_num++;
 464         qd++;
 465
 466         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_di.di_gid, CREATE, qd);
 467         if (error)
 468                 goto out;
 469         al->al_qd_num++;
 470         qd++;
 471
 472         if (uid != NO_QUOTA_CHANGE && uid != ip->i_di.di_uid) {
 473                 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
 474                 if (error)
 475                         goto out;
 476                 al->al_qd_num++;
 477                 qd++;
 478         }
 479
 480         if (gid != NO_QUOTA_CHANGE && gid != ip->i_di.di_gid) {
 481                 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
 482                 if (error)
 483                         goto out;
 484                 al->al_qd_num++;
 485                 qd++;
 486         }
 487
 488  out:
 489         if (error)
 490                 gfs2_quota_unhold(ip);
 491
 492         return error;
 493 }
 494
 495 void gfs2_quota_unhold(struct gfs2_inode *ip)
 496 {
 497         struct gfs2_sbd *sdp = ip->i_sbd;
 498         struct gfs2_alloc *al = &ip->i_alloc;
 499         unsigned int x;
 500
 501         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 502
 503         for (x = 0; x < al->al_qd_num; x++) {
 504                 qdsb_put(al->al_qd[x]);
 505                 al->al_qd[x] = NULL;
 506         }
 507         al->al_qd_num = 0;
 508 }
 509
 510 static int sort_qd(const void *a, const void *b)
 511 {
 512         struct gfs2_quota_data *qd_a = *(struct gfs2_quota_data **)a;
 513         struct gfs2_quota_data *qd_b = *(struct gfs2_quota_data **)b;
 514         int ret = 0;
 515
 516         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 517             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 518                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 519                         ret = -1;
 520                 else
 521                         ret = 1;
 522         } else {
 523                 if (qd_a->qd_id < qd_b->qd_id)
 524                         ret = -1;
 525                 else if (qd_a->qd_id > qd_b->qd_id)
 526                         ret = 1;
 527         }
 528
 529         return ret;
 530 }
 531
 532 static void do_qc(struct gfs2_quota_data *qd, int64_t change)
 533 {
 534         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 535         struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
 536         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 537         int64_t x;
 538
 539         mutex_lock(&sdp->sd_quota_mutex);
 540         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 541
 542         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 543                 qc->qc_change = 0;
 544                 qc->qc_flags = 0;
 545                 if (test_bit(QDF_USER, &qd->qd_flags))
 546                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 547                 qc->qc_id = cpu_to_be32(qd->qd_id);
 548         }
 549
 550         x = qc->qc_change;
 551         x = be64_to_cpu(x) + change;
 552         qc->qc_change = cpu_to_be64(x);
 553
 554         spin_lock(&sdp->sd_quota_spin);
 555         qd->qd_change = x;
 556         spin_unlock(&sdp->sd_quota_spin);
 557
 558         if (!x) {
 559                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 560                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 561                 qc->qc_flags = 0;
 562                 qc->qc_id = 0;
 563                 slot_put(qd);
 564                 qd_put(qd);
 565         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 566                 qd_hold(qd);
 567                 slot_hold(qd);
 568         }
 569
 570         mutex_unlock(&sdp->sd_quota_mutex);
 571 }
 572
 573 /**
 574  * gfs2_adjust_quota
 575  *
 576  * This function was mostly borrowed from gfs2_block_truncate_page which was
 577  * in turn mostly borrowed from ext3
 578  */
 579 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 580                              int64_t change, struct gfs2_quota_data *qd)
 581 {
 582         struct inode *inode = ip->i_vnode;
 583         struct address_space *mapping = inode->i_mapping;
 584         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 585         unsigned offset = loc & (PAGE_CACHE_SHIFT - 1);
 586         unsigned blocksize, iblock, pos;
 587         struct buffer_head *bh;
 588         struct page *page;
 589         void *kaddr;
 590         __be64 *ptr;
 591         u64 value;
 592         int err = -EIO;
 593
 594         page = grab_cache_page(mapping, index);
 595         if (!page)
 596                 return -ENOMEM;
 597
 598         blocksize = inode->i_sb->s_blocksize;
 599         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 600
 601         if (!page_has_buffers(page))
 602                 create_empty_buffers(page, blocksize, 0);
 603
 604         bh = page_buffers(page);
 605         pos = blocksize;
 606         while (offset >= pos) {
 607                 bh = bh->b_this_page;
 608                 iblock++;
 609                 pos += blocksize;
 610         }
 611
 612         if (!buffer_mapped(bh)) {
 613                 gfs2_get_block(inode, iblock, bh, 1);
 614                 if (!buffer_mapped(bh))
 615                         goto unlock;
 616         }
 617
 618         if (PageUptodate(page))
 619                 set_buffer_uptodate(bh);
 620
 621         if (!buffer_uptodate(bh)) {
 622                 ll_rw_block(READ, 1, &bh);
 623                 wait_on_buffer(bh);
 624                 if (!buffer_uptodate(bh))
 625                         goto unlock;
 626         }
 627
 628         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 629
 630         kaddr = kmap_atomic(page, KM_USER0);
 631         ptr = (__be64 *)(kaddr + offset);
 632         value = *ptr = cpu_to_be64(be64_to_cpu(*ptr) + change);
 633         flush_dcache_page(page);
 634         kunmap_atomic(kaddr, KM_USER0);
 635         err = 0;
 636         qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
 637 #if 0
 638         qd->qd_qb.qb_limit = cpu_to_be64(q.qu_limit);
 639         qd->qd_qb.qb_warn = cpu_to_be64(q.qu_warn);
 640 #endif
 641         qd->qd_qb.qb_value = cpu_to_be64(value);
 642 unlock:
 643         unlock_page(page);
 644         page_cache_release(page);
 645         return err;
 646 }
 647
 648 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 649 {
 650         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 651         struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
 652         unsigned int data_blocks, ind_blocks;
 653         struct file_ra_state ra_state;
 654         struct gfs2_holder *ghs, i_gh;
 655         unsigned int qx, x;
 656         struct gfs2_quota_data *qd;
 657         loff_t offset;
 658         unsigned int nalloc = 0;
 659         struct gfs2_alloc *al = NULL;
 660         int error;
 661
 662         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 663                               &data_blocks, &ind_blocks);
 664
 665         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_KERNEL);
 666         if (!ghs)
 667                 return -ENOMEM;
 668
 669         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 670         for (qx = 0; qx < num_qd; qx++) {
 671                 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
 672                                            LM_ST_EXCLUSIVE,
 673                                            GL_NOCACHE, &ghs[qx]);
 674                 if (error)
 675                         goto out;
 676         }
 677
 678         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 679         if (error)
 680                 goto out;
 681
 682         for (x = 0; x < num_qd; x++) {
 683                 int alloc_required;
 684
 685                 offset = qd2offset(qda[x]);
 686                 error = gfs2_write_alloc_required(ip, offset,
 687                                                   sizeof(struct gfs2_quota),
 688                                                   &alloc_required);
 689                 if (error)
 690                         goto out_gunlock;
 691                 if (alloc_required)
 692                         nalloc++;
 693         }
 694
 695         if (nalloc) {
 696                 al = gfs2_alloc_get(ip);
 697
 698                 al->al_requested = nalloc * (data_blocks + ind_blocks);
 699
 700                 error = gfs2_inplace_reserve(ip);
 701                 if (error)
 702                         goto out_alloc;
 703
 704                 error = gfs2_trans_begin(sdp,
 705                                          al->al_rgd->rd_ri.ri_length +
 706                                          num_qd * data_blocks +
 707                                          nalloc * ind_blocks +
 708                                          RES_DINODE + num_qd +
 709                                          RES_STATFS, 0);
 710                 if (error)
 711                         goto out_ipres;
 712         } else {
 713                 error = gfs2_trans_begin(sdp,
 714                                          num_qd * data_blocks +
 715                                          RES_DINODE + num_qd, 0);
 716                 if (error)
 717                         goto out_gunlock;
 718         }
 719
 720         file_ra_state_init(&ra_state, ip->i_vnode->i_mapping);
 721         for (x = 0; x < num_qd; x++) {
 722                 qd = qda[x];
 723                 offset = qd2offset(qd);
 724                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
 725                                           (struct gfs2_quota_data *)
 726                                           qd->qd_gl->gl_lvb);
 727                 if (error)
 728                         goto out_end_trans;
 729
 730                 do_qc(qd, -qd->qd_change_sync);
 731         }
 732
 733         error = 0;
 734
 735  out_end_trans:
 736         gfs2_trans_end(sdp);
 737
 738  out_ipres:
 739         if (nalloc)
 740                 gfs2_inplace_release(ip);
 741
 742  out_alloc:
 743         if (nalloc)
 744                 gfs2_alloc_put(ip);
 745
 746  out_gunlock:
 747         gfs2_glock_dq_uninit(&i_gh);
 748
 749  out:
 750         while (qx--)
 751                 gfs2_glock_dq_uninit(&ghs[qx]);
 752         kfree(ghs);
 753         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 754
 755         return error;
 756 }
 757
 758 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 759                     struct gfs2_holder *q_gh)
 760 {
 761         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 762         struct gfs2_inode *ip = sdp->sd_quota_inode->u.generic_ip;
 763         struct gfs2_holder i_gh;
 764         struct gfs2_quota q;
 765         char buf[sizeof(struct gfs2_quota)];
 766         struct file_ra_state ra_state;
 767         int error;
 768
 769         file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
 770  restart:
 771         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 772         if (error)
 773                 return error;
 774
 775         gfs2_quota_lvb_in(&qd->qd_qb, qd->qd_gl->gl_lvb);
 776
 777         if (force_refresh || qd->qd_qb.qb_magic != GFS2_MAGIC) {
 778                 loff_t pos;
 779                 gfs2_glock_dq_uninit(q_gh);
 780                 error = gfs2_glock_nq_init(qd->qd_gl,
 781                                           LM_ST_EXCLUSIVE, GL_NOCACHE,
 782                                           q_gh);
 783                 if (error)
 784                         return error;
 785
 786                 error = gfs2_glock_nq_init(ip->i_gl,
 787                                           LM_ST_SHARED, 0,
 788                                           &i_gh);
 789                 if (error)
 790                         goto fail;
 791
 792                 memset(buf, 0, sizeof(struct gfs2_quota));
 793                 pos = qd2offset(qd);
 794                 error = gfs2_internal_read(ip,
 795                                             &ra_state, buf,
 796                                             &pos,
 797                                             sizeof(struct gfs2_quota));
 798                 if (error < 0)
 799                         goto fail_gunlock;
 800
 801                 gfs2_glock_dq_uninit(&i_gh);
 802
 803                 gfs2_quota_in(&q, buf);
 804
 805                 memset(&qd->qd_qb, 0, sizeof(struct gfs2_quota_lvb));
 806                 qd->qd_qb.qb_magic = GFS2_MAGIC;
 807                 qd->qd_qb.qb_limit = q.qu_limit;
 808                 qd->qd_qb.qb_warn = q.qu_warn;
 809                 qd->qd_qb.qb_value = q.qu_value;
 810
 811                 gfs2_quota_lvb_out(&qd->qd_qb, qd->qd_gl->gl_lvb);
 812
 813                 if (gfs2_glock_is_blocking(qd->qd_gl)) {
 814                         gfs2_glock_dq_uninit(q_gh);
 815                         force_refresh = 0;
 816                         goto restart;
 817                 }
 818         }
 819
 820         return 0;
 821
 822  fail_gunlock:
 823         gfs2_glock_dq_uninit(&i_gh);
 824
 825  fail:
 826         gfs2_glock_dq_uninit(q_gh);
 827
 828         return error;
 829 }
 830
 831 int gfs2_quota_lock(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 832 {
 833         struct gfs2_sbd *sdp = ip->i_sbd;
 834         struct gfs2_alloc *al = &ip->i_alloc;
 835         unsigned int x;
 836         int error = 0;
 837
 838         gfs2_quota_hold(ip, uid, gid);
 839
 840         if (capable(CAP_SYS_RESOURCE) ||
 841             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 842                 return 0;
 843
 844         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 845              sort_qd, NULL);
 846
 847         for (x = 0; x < al->al_qd_num; x++) {
 848                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 849                 if (error)
 850                         break;
 851         }
 852
 853         if (!error)
 854                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 855         else {
 856                 while (x--)
 857                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 858                 gfs2_quota_unhold(ip);
 859         }
 860
 861         return error;
 862 }
 863
 864 static int need_sync(struct gfs2_quota_data *qd)
 865 {
 866         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 867         struct gfs2_tune *gt = &sdp->sd_tune;
 868         int64_t value;
 869         unsigned int num, den;
 870         int do_sync = 1;
 871
 872         if (!qd->qd_qb.qb_limit)
 873                 return 0;
 874
 875         spin_lock(&sdp->sd_quota_spin);
 876         value = qd->qd_change;
 877         spin_unlock(&sdp->sd_quota_spin);
 878
 879         spin_lock(&gt->gt_spin);
 880         num = gt->gt_quota_scale_num;
 881         den = gt->gt_quota_scale_den;
 882         spin_unlock(&gt->gt_spin);
 883
 884         if (value < 0)
 885                 do_sync = 0;
 886         else if (qd->qd_qb.qb_value >= (int64_t)qd->qd_qb.qb_limit)
 887                 do_sync = 0;
 888         else {
 889                 value *= gfs2_jindex_size(sdp) * num;
 890                 do_div(value, den);
 891                 value += qd->qd_qb.qb_value;
 892                 if (value < (int64_t)qd->qd_qb.qb_limit)
 893                         do_sync = 0;
 894         }
 895
 896         return do_sync;
 897 }
 898
 899 void gfs2_quota_unlock(struct gfs2_inode *ip)
 900 {
 901         struct gfs2_alloc *al = &ip->i_alloc;
 902         struct gfs2_quota_data *qda[4];
 903         unsigned int count = 0;
 904         unsigned int x;
 905
 906         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
 907                 goto out;
 908
 909         for (x = 0; x < al->al_qd_num; x++) {
 910                 struct gfs2_quota_data *qd;
 911                 int sync;
 912
 913                 qd = al->al_qd[x];
 914                 sync = need_sync(qd);
 915
 916                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 917
 918                 if (sync && qd_trylock(qd))
 919                         qda[count++] = qd;
 920         }
 921
 922         if (count) {
 923                 do_sync(count, qda);
 924                 for (x = 0; x < count; x++)
 925                         qd_unlock(qda[x]);
 926         }
 927
 928  out:
 929         gfs2_quota_unhold(ip);
 930 }
 931
 932 #define MAX_LINE 256
 933
 934 static int print_message(struct gfs2_quota_data *qd, char *type)
 935 {
 936         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 937         char *line;
 938         int len;
 939
 940         line = kmalloc(MAX_LINE, GFP_KERNEL);
 941         if (!line)
 942                 return -ENOMEM;
 943
 944         len = snprintf(line, MAX_LINE-1,
 945                        "GFS2: fsid=%s: quota %s for %s %u\r\n",
 946                        sdp->sd_fsname, type,
 947                        (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
 948                        qd->qd_id);
 949         line[MAX_LINE-1] = 0;
 950
 951         if (current->signal) { /* Is this test still required? */
 952                 tty_write_message(current->signal->tty, line);
 953         }
 954
 955         kfree(line);
 956
 957         return 0;
 958 }
 959
 960 int gfs2_quota_check(struct gfs2_inode *ip, uint32_t uid, uint32_t gid)
 961 {
 962         struct gfs2_sbd *sdp = ip->i_sbd;
 963         struct gfs2_alloc *al = &ip->i_alloc;
 964         struct gfs2_quota_data *qd;
 965         int64_t value;
 966         unsigned int x;
 967         int error = 0;
 968
 969         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
 970                 return 0;
 971
 972         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 973                 return 0;
 974
 975         for (x = 0; x < al->al_qd_num; x++) {
 976                 qd = al->al_qd[x];
 977
 978                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 979                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
 980                         continue;
 981
 982                 value = qd->qd_qb.qb_value;
 983                 spin_lock(&sdp->sd_quota_spin);
 984                 value += qd->qd_change;
 985                 spin_unlock(&sdp->sd_quota_spin);
 986
 987                 if (qd->qd_qb.qb_limit && (int64_t)qd->qd_qb.qb_limit < value) {
 988                         print_message(qd, "exceeded");
 989                         error = -EDQUOT;
 990                         break;
 991                 } else if (qd->qd_qb.qb_warn &&
 992                            (int64_t)qd->qd_qb.qb_warn < value &&
 993                            time_after_eq(jiffies, qd->qd_last_warn +
 994                                          gfs2_tune_get(sdp,
 995                                                 gt_quota_warn_period) * HZ)) {
 996                         error = print_message(qd, "warning");
 997                         qd->qd_last_warn = jiffies;
 998                 }
 999         }
1000
1001         return error;
1002 }
1003
1004 void gfs2_quota_change(struct gfs2_inode *ip, int64_t change,
1005                        uint32_t uid, uint32_t gid)
1006 {
1007         struct gfs2_alloc *al = &ip->i_alloc;
1008         struct gfs2_quota_data *qd;
1009         unsigned int x;
1010         unsigned int found = 0;
1011
1012         if (gfs2_assert_warn(ip->i_sbd, change))
1013                 return;
1014         if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
1015                 return;
1016
1017         for (x = 0; x < al->al_qd_num; x++) {
1018                 qd = al->al_qd[x];
1019
1020                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1021                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1022                         do_qc(qd, change);
1023                         found++;
1024                 }
1025         }
1026 }
1027
1028 int gfs2_quota_sync(struct gfs2_sbd *sdp)
1029 {
1030         struct gfs2_quota_data **qda;
1031         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1032         unsigned int num_qd;
1033         unsigned int x;
1034         int error = 0;
1035
1036         sdp->sd_quota_sync_gen++;
1037
1038         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1039         if (!qda)
1040                 return -ENOMEM;
1041
1042         do {
1043                 num_qd = 0;
1044
1045                 for (;;) {
1046                         error = qd_fish(sdp, qda + num_qd);
1047                         if (error || !qda[num_qd])
1048                                 break;
1049                         if (++num_qd == max_qd)
1050                                 break;
1051                 }
1052
1053                 if (num_qd) {
1054                         if (!error)
1055                                 error = do_sync(num_qd, qda);
1056                         if (!error)
1057                                 for (x = 0; x < num_qd; x++)
1058                                         qda[x]->qd_sync_gen =
1059                                                 sdp->sd_quota_sync_gen;
1060
1061                         for (x = 0; x < num_qd; x++)
1062                                 qd_unlock(qda[x]);
1063                 }
1064         } while (!error && num_qd == max_qd);
1065
1066         kfree(qda);
1067
1068         return error;
1069 }
1070
1071 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, uint32_t id)
1072 {
1073         struct gfs2_quota_data *qd;
1074         struct gfs2_holder q_gh;
1075         int error;
1076
1077         error = qd_get(sdp, user, id, CREATE, &qd);
1078         if (error)
1079                 return error;
1080
1081         error = do_glock(qd, FORCE, &q_gh);
1082         if (!error)
1083                 gfs2_glock_dq_uninit(&q_gh);
1084
1085         qd_put(qd);
1086
1087         return error;
1088 }
1089
1090 #if 0
1091 int gfs2_quota_read(struct gfs2_sbd *sdp, int user, uint32_t id,
1092                     struct gfs2_quota *q)
1093 {
1094         struct gfs2_quota_data *qd;
1095         struct gfs2_holder q_gh;
1096         int error;
1097
1098         if (((user) ? (id != current->fsuid) : (!in_group_p(id))) &&
1099             !capable(CAP_SYS_ADMIN))
1100                 return -EACCES;
1101
1102         error = qd_get(sdp, user, id, CREATE, &qd);
1103         if (error)
1104                 return error;
1105
1106         error = do_glock(qd, NO_FORCE, &q_gh);
1107         if (error)
1108                 goto out;
1109
1110         memset(q, 0, sizeof(struct gfs2_quota));
1111         q->qu_limit = qd->qd_qb.qb_limit;
1112         q->qu_warn = qd->qd_qb.qb_warn;
1113         q->qu_value = qd->qd_qb.qb_value;
1114
1115         spin_lock(&sdp->sd_quota_spin);
1116         q->qu_value += qd->qd_change;
1117         spin_unlock(&sdp->sd_quota_spin);
1118
1119         gfs2_glock_dq_uninit(&q_gh);
1120
1121  out:
1122         qd_put(qd);
1123
1124         return error;
1125 }
1126 #endif  /*  0  */
1127
1128 int gfs2_quota_init(struct gfs2_sbd *sdp)
1129 {
1130         struct gfs2_inode *ip = sdp->sd_qc_inode->u.generic_ip;
1131         unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
1132         unsigned int x, slot = 0;
1133         unsigned int found = 0;
1134         uint64_t dblock;
1135         uint32_t extlen = 0;
1136         int error;
1137
1138         if (!ip->i_di.di_size ||
1139             ip->i_di.di_size > (64 << 20) ||
1140             ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
1141                 gfs2_consist_inode(ip);
1142                 return -EIO;
1143         }
1144         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1145         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1146
1147         error = -ENOMEM;
1148
1149         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1150                                        sizeof(unsigned char *), GFP_KERNEL);
1151         if (!sdp->sd_quota_bitmap)
1152                 return error;
1153
1154         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1155                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_KERNEL);
1156                 if (!sdp->sd_quota_bitmap[x])
1157                         goto fail;
1158         }
1159
1160         for (x = 0; x < blocks; x++) {
1161                 struct buffer_head *bh;
1162                 unsigned int y;
1163
1164                 if (!extlen) {
1165                         int new = 0;
1166                         error = gfs2_extent_map(ip->i_vnode, x, &new, &dblock, &extlen);
1167                         if (error)
1168                                 goto fail;
1169                 }
1170                 gfs2_meta_ra(ip->i_gl,  dblock, extlen);
1171                 error = gfs2_meta_read(ip->i_gl, dblock, DIO_START | DIO_WAIT,
1172                                        &bh);
1173                 if (error)
1174                         goto fail;
1175                 error = -EIO;
1176                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1177                         brelse(bh);
1178                         goto fail;
1179                 }
1180
1181                 for (y = 0;
1182                      y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1183                      y++, slot++) {
1184                         struct gfs2_quota_change qc;
1185                         struct gfs2_quota_data *qd;
1186
1187                         gfs2_quota_change_in(&qc, bh->b_data +
1188                                           sizeof(struct gfs2_meta_header) +
1189                                           y * sizeof(struct gfs2_quota_change));
1190                         if (!qc.qc_change)
1191                                 continue;
1192
1193                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1194                                          qc.qc_id, &qd);
1195                         if (error) {
1196                                 brelse(bh);
1197                                 goto fail;
1198                         }
1199
1200                         set_bit(QDF_CHANGE, &qd->qd_flags);
1201                         qd->qd_change = qc.qc_change;
1202                         qd->qd_slot = slot;
1203                         qd->qd_slot_count = 1;
1204                         qd->qd_last_touched = jiffies;
1205
1206                         spin_lock(&sdp->sd_quota_spin);
1207                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1208                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1209                         atomic_inc(&sdp->sd_quota_count);
1210                         spin_unlock(&sdp->sd_quota_spin);
1211
1212                         found++;
1213                 }
1214
1215                 brelse(bh);
1216                 dblock++;
1217                 extlen--;
1218         }
1219
1220         if (found)
1221                 fs_info(sdp, "found %u quota changes\n", found);
1222
1223         return 0;
1224
1225  fail:
1226         gfs2_quota_cleanup(sdp);
1227         return error;
1228 }
1229
1230 void gfs2_quota_scan(struct gfs2_sbd *sdp)
1231 {
1232         struct gfs2_quota_data *qd, *safe;
1233         LIST_HEAD(dead);
1234
1235         spin_lock(&sdp->sd_quota_spin);
1236         list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1237                 if (!qd->qd_count &&
1238                     time_after_eq(jiffies, qd->qd_last_touched +
1239                                 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1240                         list_move(&qd->qd_list, &dead);
1241                         gfs2_assert_warn(sdp,
1242                                          atomic_read(&sdp->sd_quota_count) > 0);
1243                         atomic_dec(&sdp->sd_quota_count);
1244                 }
1245         }
1246         spin_unlock(&sdp->sd_quota_spin);
1247
1248         while (!list_empty(&dead)) {
1249                 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1250                 list_del(&qd->qd_list);
1251
1252                 gfs2_assert_warn(sdp, !qd->qd_change);
1253                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1254                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1255
1256                 gfs2_lvb_unhold(qd->qd_gl);
1257                 kfree(qd);
1258         }
1259 }
1260
1261 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1262 {
1263         struct list_head *head = &sdp->sd_quota_list;
1264         struct gfs2_quota_data *qd;
1265         unsigned int x;
1266
1267         spin_lock(&sdp->sd_quota_spin);
1268         while (!list_empty(head)) {
1269                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1270
1271                 if (qd->qd_count > 1 ||
1272                     (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1273                         list_move(&qd->qd_list, head);
1274                         spin_unlock(&sdp->sd_quota_spin);
1275                         schedule();
1276                         spin_lock(&sdp->sd_quota_spin);
1277                         continue;
1278                 }
1279
1280                 list_del(&qd->qd_list);
1281                 atomic_dec(&sdp->sd_quota_count);
1282                 spin_unlock(&sdp->sd_quota_spin);
1283
1284                 if (!qd->qd_count) {
1285                         gfs2_assert_warn(sdp, !qd->qd_change);
1286                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1287                 } else
1288                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1289                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1290
1291                 gfs2_lvb_unhold(qd->qd_gl);
1292                 kfree(qd);
1293
1294                 spin_lock(&sdp->sd_quota_spin);
1295         }
1296         spin_unlock(&sdp->sd_quota_spin);
1297
1298         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1299
1300         if (sdp->sd_quota_bitmap) {
1301                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1302                         kfree(sdp->sd_quota_bitmap[x]);
1303                 kfree(sdp->sd_quota_bitmap);
1304         }
1305 }
1306