fs/gfs2/quota.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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 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/sort.h>
  45 #include <linux/fs.h>
  46 #include <linux/bio.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <linux/lm_interface.h>
  49
  50 #include "gfs2.h"
  51 #include "incore.h"
  52 #include "bmap.h"
  53 #include "glock.h"
  54 #include "glops.h"
  55 #include "log.h"
  56 #include "meta_io.h"
  57 #include "quota.h"
  58 #include "rgrp.h"
  59 #include "super.h"
  60 #include "trans.h"
  61 #include "inode.h"
  62 #include "ops_file.h"
  63 #include "ops_address.h"
  64 #include "util.h"
  65
  66 #define QUOTA_USER 1
  67 #define QUOTA_GROUP 0
  68
  69 static u64 qd2offset(struct gfs2_quota_data *qd)
  70 {
  71         u64 offset;
  72
  73         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
  74         offset *= sizeof(struct gfs2_quota);
  75
  76         return offset;
  77 }
  78
  79 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
  80                     struct gfs2_quota_data **qdp)
  81 {
  82         struct gfs2_quota_data *qd;
  83         int error;
  84
  85         qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
  86         if (!qd)
  87                 return -ENOMEM;
  88
  89         qd->qd_count = 1;
  90         qd->qd_id = id;
  91         if (user)
  92                 set_bit(QDF_USER, &qd->qd_flags);
  93         qd->qd_slot = -1;
  94
  95         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
  96                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
  97         if (error)
  98                 goto fail;
  99
 100         error = gfs2_lvb_hold(qd->qd_gl);
 101         gfs2_glock_put(qd->qd_gl);
 102         if (error)
 103                 goto fail;
 104
 105         *qdp = qd;
 106
 107         return 0;
 108
 109 fail:
 110         kfree(qd);
 111         return error;
 112 }
 113
 114 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 115                   struct gfs2_quota_data **qdp)
 116 {
 117         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
 118         int error, found;
 119
 120         *qdp = NULL;
 121
 122         for (;;) {
 123                 found = 0;
 124                 spin_lock(&sdp->sd_quota_spin);
 125                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 126                         if (qd->qd_id == id &&
 127                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
 128                                 qd->qd_count++;
 129                                 found = 1;
 130                                 break;
 131                         }
 132                 }
 133
 134                 if (!found)
 135                         qd = NULL;
 136
 137                 if (!qd && new_qd) {
 138                         qd = new_qd;
 139                         list_add(&qd->qd_list, &sdp->sd_quota_list);
 140                         atomic_inc(&sdp->sd_quota_count);
 141                         new_qd = NULL;
 142                 }
 143
 144                 spin_unlock(&sdp->sd_quota_spin);
 145
 146                 if (qd || !create) {
 147                         if (new_qd) {
 148                                 gfs2_lvb_unhold(new_qd->qd_gl);
 149                                 kfree(new_qd);
 150                         }
 151                         *qdp = qd;
 152                         return 0;
 153                 }
 154
 155                 error = qd_alloc(sdp, user, id, &new_qd);
 156                 if (error)
 157                         return error;
 158         }
 159 }
 160
 161 static void qd_hold(struct gfs2_quota_data *qd)
 162 {
 163         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 164
 165         spin_lock(&sdp->sd_quota_spin);
 166         gfs2_assert(sdp, qd->qd_count);
 167         qd->qd_count++;
 168         spin_unlock(&sdp->sd_quota_spin);
 169 }
 170
 171 static void qd_put(struct gfs2_quota_data *qd)
 172 {
 173         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 174         spin_lock(&sdp->sd_quota_spin);
 175         gfs2_assert(sdp, qd->qd_count);
 176         if (!--qd->qd_count)
 177                 qd->qd_last_touched = jiffies;
 178         spin_unlock(&sdp->sd_quota_spin);
 179 }
 180
 181 static int slot_get(struct gfs2_quota_data *qd)
 182 {
 183         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 184         unsigned int c, o = 0, b;
 185         unsigned char byte = 0;
 186
 187         spin_lock(&sdp->sd_quota_spin);
 188
 189         if (qd->qd_slot_count++) {
 190                 spin_unlock(&sdp->sd_quota_spin);
 191                 return 0;
 192         }
 193
 194         for (c = 0; c < sdp->sd_quota_chunks; c++)
 195                 for (o = 0; o < PAGE_SIZE; o++) {
 196                         byte = sdp->sd_quota_bitmap[c][o];
 197                         if (byte != 0xFF)
 198                                 goto found;
 199                 }
 200
 201         goto fail;
 202
 203 found:
 204         for (b = 0; b < 8; b++)
 205                 if (!(byte & (1 << b)))
 206                         break;
 207         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
 208
 209         if (qd->qd_slot >= sdp->sd_quota_slots)
 210                 goto fail;
 211
 212         sdp->sd_quota_bitmap[c][o] |= 1 << b;
 213
 214         spin_unlock(&sdp->sd_quota_spin);
 215
 216         return 0;
 217
 218 fail:
 219         qd->qd_slot_count--;
 220         spin_unlock(&sdp->sd_quota_spin);
 221         return -ENOSPC;
 222 }
 223
 224 static void slot_hold(struct gfs2_quota_data *qd)
 225 {
 226         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 227
 228         spin_lock(&sdp->sd_quota_spin);
 229         gfs2_assert(sdp, qd->qd_slot_count);
 230         qd->qd_slot_count++;
 231         spin_unlock(&sdp->sd_quota_spin);
 232 }
 233
 234 static void slot_put(struct gfs2_quota_data *qd)
 235 {
 236         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 237
 238         spin_lock(&sdp->sd_quota_spin);
 239         gfs2_assert(sdp, qd->qd_slot_count);
 240         if (!--qd->qd_slot_count) {
 241                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
 242                 qd->qd_slot = -1;
 243         }
 244         spin_unlock(&sdp->sd_quota_spin);
 245 }
 246
 247 static int bh_get(struct gfs2_quota_data *qd)
 248 {
 249         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 250         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 251         unsigned int block, offset;
 252         struct buffer_head *bh;
 253         int error;
 254         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 255
 256         mutex_lock(&sdp->sd_quota_mutex);
 257
 258         if (qd->qd_bh_count++) {
 259                 mutex_unlock(&sdp->sd_quota_mutex);
 260                 return 0;
 261         }
 262
 263         block = qd->qd_slot / sdp->sd_qc_per_block;
 264         offset = qd->qd_slot % sdp->sd_qc_per_block;;
 265
 266         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 267         error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map);
 268         if (error)
 269                 goto fail;
 270         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
 271         if (error)
 272                 goto fail;
 273         error = -EIO;
 274         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 275                 goto fail_brelse;
 276
 277         qd->qd_bh = bh;
 278         qd->qd_bh_qc = (struct gfs2_quota_change *)
 279                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 280                  offset * sizeof(struct gfs2_quota_change));
 281
 282         mutex_unlock(&sdp->sd_quota_mutex);
 283
 284         return 0;
 285
 286 fail_brelse:
 287         brelse(bh);
 288 fail:
 289         qd->qd_bh_count--;
 290         mutex_unlock(&sdp->sd_quota_mutex);
 291         return error;
 292 }
 293
 294 static void bh_put(struct gfs2_quota_data *qd)
 295 {
 296         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 297
 298         mutex_lock(&sdp->sd_quota_mutex);
 299         gfs2_assert(sdp, qd->qd_bh_count);
 300         if (!--qd->qd_bh_count) {
 301                 brelse(qd->qd_bh);
 302                 qd->qd_bh = NULL;
 303                 qd->qd_bh_qc = NULL;
 304         }
 305         mutex_unlock(&sdp->sd_quota_mutex);
 306 }
 307
 308 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 309 {
 310         struct gfs2_quota_data *qd = NULL;
 311         int error;
 312         int found = 0;
 313
 314         *qdp = NULL;
 315
 316         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 317                 return 0;
 318
 319         spin_lock(&sdp->sd_quota_spin);
 320
 321         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
 322                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 323                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 324                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
 325                         continue;
 326
 327                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 328
 329                 set_bit(QDF_LOCKED, &qd->qd_flags);
 330                 gfs2_assert_warn(sdp, qd->qd_count);
 331                 qd->qd_count++;
 332                 qd->qd_change_sync = qd->qd_change;
 333                 gfs2_assert_warn(sdp, qd->qd_slot_count);
 334                 qd->qd_slot_count++;
 335                 found = 1;
 336
 337                 break;
 338         }
 339
 340         if (!found)
 341                 qd = NULL;
 342
 343         spin_unlock(&sdp->sd_quota_spin);
 344
 345         if (qd) {
 346                 gfs2_assert_warn(sdp, qd->qd_change_sync);
 347                 error = bh_get(qd);
 348                 if (error) {
 349                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 350                         slot_put(qd);
 351                         qd_put(qd);
 352                         return error;
 353                 }
 354         }
 355
 356         *qdp = qd;
 357
 358         return 0;
 359 }
 360
 361 static int qd_trylock(struct gfs2_quota_data *qd)
 362 {
 363         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 364
 365         if (sdp->sd_vfs->s_flags & MS_RDONLY)
 366                 return 0;
 367
 368         spin_lock(&sdp->sd_quota_spin);
 369
 370         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 371             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
 372                 spin_unlock(&sdp->sd_quota_spin);
 373                 return 0;
 374         }
 375
 376         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 377
 378         set_bit(QDF_LOCKED, &qd->qd_flags);
 379         gfs2_assert_warn(sdp, qd->qd_count);
 380         qd->qd_count++;
 381         qd->qd_change_sync = qd->qd_change;
 382         gfs2_assert_warn(sdp, qd->qd_slot_count);
 383         qd->qd_slot_count++;
 384
 385         spin_unlock(&sdp->sd_quota_spin);
 386
 387         gfs2_assert_warn(sdp, qd->qd_change_sync);
 388         if (bh_get(qd)) {
 389                 clear_bit(QDF_LOCKED, &qd->qd_flags);
 390                 slot_put(qd);
 391                 qd_put(qd);
 392                 return 0;
 393         }
 394
 395         return 1;
 396 }
 397
 398 static void qd_unlock(struct gfs2_quota_data *qd)
 399 {
 400         gfs2_assert_warn(qd->qd_gl->gl_sbd,
 401                          test_bit(QDF_LOCKED, &qd->qd_flags));
 402         clear_bit(QDF_LOCKED, &qd->qd_flags);
 403         bh_put(qd);
 404         slot_put(qd);
 405         qd_put(qd);
 406 }
 407
 408 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
 409                     struct gfs2_quota_data **qdp)
 410 {
 411         int error;
 412
 413         error = qd_get(sdp, user, id, create, qdp);
 414         if (error)
 415                 return error;
 416
 417         error = slot_get(*qdp);
 418         if (error)
 419                 goto fail;
 420
 421         error = bh_get(*qdp);
 422         if (error)
 423                 goto fail_slot;
 424
 425         return 0;
 426
 427 fail_slot:
 428         slot_put(*qdp);
 429 fail:
 430         qd_put(*qdp);
 431         return error;
 432 }
 433
 434 static void qdsb_put(struct gfs2_quota_data *qd)
 435 {
 436         bh_put(qd);
 437         slot_put(qd);
 438         qd_put(qd);
 439 }
 440
 441 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 442 {
 443         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 444         struct gfs2_alloc *al = &ip->i_alloc;
 445         struct gfs2_quota_data **qd = al->al_qd;
 446         int error;
 447
 448         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
 449             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
 450                 return -EIO;
 451
 452         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 453                 return 0;
 454
 455         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
 456         if (error)
 457                 goto out;
 458         al->al_qd_num++;
 459         qd++;
 460
 461         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
 462         if (error)
 463                 goto out;
 464         al->al_qd_num++;
 465         qd++;
 466
 467         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
 468                 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
 469                 if (error)
 470                         goto out;
 471                 al->al_qd_num++;
 472                 qd++;
 473         }
 474
 475         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
 476                 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
 477                 if (error)
 478                         goto out;
 479                 al->al_qd_num++;
 480                 qd++;
 481         }
 482
 483 out:
 484         if (error)
 485                 gfs2_quota_unhold(ip);
 486         return error;
 487 }
 488
 489 void gfs2_quota_unhold(struct gfs2_inode *ip)
 490 {
 491         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 492         struct gfs2_alloc *al = &ip->i_alloc;
 493         unsigned int x;
 494
 495         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 496
 497         for (x = 0; x < al->al_qd_num; x++) {
 498                 qdsb_put(al->al_qd[x]);
 499                 al->al_qd[x] = NULL;
 500         }
 501         al->al_qd_num = 0;
 502 }
 503
 504 static int sort_qd(const void *a, const void *b)
 505 {
 506         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 507         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 508
 509         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
 510             !test_bit(QDF_USER, &qd_b->qd_flags)) {
 511                 if (test_bit(QDF_USER, &qd_a->qd_flags))
 512                         return -1;
 513                 else
 514                         return 1;
 515         }
 516         if (qd_a->qd_id < qd_b->qd_id)
 517                 return -1;
 518         if (qd_a->qd_id > qd_b->qd_id)
 519                 return 1;
 520
 521         return 0;
 522 }
 523
 524 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 525 {
 526         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 527         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 528         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 529         s64 x;
 530
 531         mutex_lock(&sdp->sd_quota_mutex);
 532         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
 533
 534         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 535                 qc->qc_change = 0;
 536                 qc->qc_flags = 0;
 537                 if (test_bit(QDF_USER, &qd->qd_flags))
 538                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 539                 qc->qc_id = cpu_to_be32(qd->qd_id);
 540         }
 541
 542         x = be64_to_cpu(qc->qc_change) + change;
 543         qc->qc_change = cpu_to_be64(x);
 544
 545         spin_lock(&sdp->sd_quota_spin);
 546         qd->qd_change = x;
 547         spin_unlock(&sdp->sd_quota_spin);
 548
 549         if (!x) {
 550                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 551                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 552                 qc->qc_flags = 0;
 553                 qc->qc_id = 0;
 554                 slot_put(qd);
 555                 qd_put(qd);
 556         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 557                 qd_hold(qd);
 558                 slot_hold(qd);
 559         }
 560
 561         mutex_unlock(&sdp->sd_quota_mutex);
 562 }
 563
 564 /**
 565  * gfs2_adjust_quota
 566  *
 567  * This function was mostly borrowed from gfs2_block_truncate_page which was
 568  * in turn mostly borrowed from ext3
 569  */
 570 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 571                              s64 change, struct gfs2_quota_data *qd)
 572 {
 573         struct inode *inode = &ip->i_inode;
 574         struct address_space *mapping = inode->i_mapping;
 575         unsigned long index = loc >> PAGE_CACHE_SHIFT;
 576         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
 577         unsigned blocksize, iblock, pos;
 578         struct buffer_head *bh;
 579         struct page *page;
 580         void *kaddr;
 581         char *ptr;
 582         struct gfs2_quota_host qp;
 583         s64 value;
 584         int err = -EIO;
 585
 586         page = grab_cache_page(mapping, index);
 587         if (!page)
 588                 return -ENOMEM;
 589
 590         blocksize = inode->i_sb->s_blocksize;
 591         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
 592
 593         if (!page_has_buffers(page))
 594                 create_empty_buffers(page, blocksize, 0);
 595
 596         bh = page_buffers(page);
 597         pos = blocksize;
 598         while (offset >= pos) {
 599                 bh = bh->b_this_page;
 600                 iblock++;
 601                 pos += blocksize;
 602         }
 603
 604         if (!buffer_mapped(bh)) {
 605                 gfs2_get_block(inode, iblock, bh, 1);
 606                 if (!buffer_mapped(bh))
 607                         goto unlock;
 608         }
 609
 610         if (PageUptodate(page))
 611                 set_buffer_uptodate(bh);
 612
 613         if (!buffer_uptodate(bh)) {
 614                 ll_rw_block(READ_META, 1, &bh);
 615                 wait_on_buffer(bh);
 616                 if (!buffer_uptodate(bh))
 617                         goto unlock;
 618         }
 619
 620         gfs2_trans_add_bh(ip->i_gl, bh, 0);
 621
 622         kaddr = kmap_atomic(page, KM_USER0);
 623         ptr = kaddr + offset;
 624         gfs2_quota_in(&qp, ptr);
 625         qp.qu_value += change;
 626         value = qp.qu_value;
 627         gfs2_quota_out(&qp, ptr);
 628         flush_dcache_page(page);
 629         kunmap_atomic(kaddr, KM_USER0);
 630         err = 0;
 631         qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
 632         qd->qd_qb.qb_value = cpu_to_be64(value);
 633         ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_magic = cpu_to_be32(GFS2_MAGIC);
 634         ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_value = cpu_to_be64(value);
 635 unlock:
 636         unlock_page(page);
 637         page_cache_release(page);
 638         return err;
 639 }
 640
 641 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 642 {
 643         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
 644         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 645         unsigned int data_blocks, ind_blocks;
 646         struct gfs2_holder *ghs, i_gh;
 647         unsigned int qx, x;
 648         struct gfs2_quota_data *qd;
 649         loff_t offset;
 650         unsigned int nalloc = 0;
 651         struct gfs2_alloc *al = NULL;
 652         int error;
 653
 654         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 655                               &data_blocks, &ind_blocks);
 656
 657         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_KERNEL);
 658         if (!ghs)
 659                 return -ENOMEM;
 660
 661         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 662         for (qx = 0; qx < num_qd; qx++) {
 663                 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
 664                                            LM_ST_EXCLUSIVE,
 665                                            GL_NOCACHE, &ghs[qx]);
 666                 if (error)
 667                         goto out;
 668         }
 669
 670         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 671         if (error)
 672                 goto out;
 673
 674         for (x = 0; x < num_qd; x++) {
 675                 int alloc_required;
 676
 677                 offset = qd2offset(qda[x]);
 678                 error = gfs2_write_alloc_required(ip, offset,
 679                                                   sizeof(struct gfs2_quota),
 680                                                   &alloc_required);
 681                 if (error)
 682                         goto out_gunlock;
 683                 if (alloc_required)
 684                         nalloc++;
 685         }
 686
 687         if (nalloc) {
 688                 al = gfs2_alloc_get(ip);
 689
 690                 al->al_requested = nalloc * (data_blocks + ind_blocks);
 691
 692                 error = gfs2_inplace_reserve(ip);
 693                 if (error)
 694                         goto out_alloc;
 695
 696                 error = gfs2_trans_begin(sdp,
 697                                          al->al_rgd->rd_ri.ri_length +
 698                                          num_qd * data_blocks +
 699                                          nalloc * ind_blocks +
 700                                          RES_DINODE + num_qd +
 701                                          RES_STATFS, 0);
 702                 if (error)
 703                         goto out_ipres;
 704         } else {
 705                 error = gfs2_trans_begin(sdp,
 706                                          num_qd * data_blocks +
 707                                          RES_DINODE + num_qd, 0);
 708                 if (error)
 709                         goto out_gunlock;
 710         }
 711
 712         for (x = 0; x < num_qd; x++) {
 713                 qd = qda[x];
 714                 offset = qd2offset(qd);
 715                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
 716                                           (struct gfs2_quota_data *)
 717                                           qd);
 718                 if (error)
 719                         goto out_end_trans;
 720
 721                 do_qc(qd, -qd->qd_change_sync);
 722         }
 723
 724         error = 0;
 725
 726 out_end_trans:
 727         gfs2_trans_end(sdp);
 728 out_ipres:
 729         if (nalloc)
 730                 gfs2_inplace_release(ip);
 731 out_alloc:
 732         if (nalloc)
 733                 gfs2_alloc_put(ip);
 734 out_gunlock:
 735         gfs2_glock_dq_uninit(&i_gh);
 736 out:
 737         while (qx--)
 738                 gfs2_glock_dq_uninit(&ghs[qx]);
 739         kfree(ghs);
 740         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
 741         return error;
 742 }
 743
 744 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 745                     struct gfs2_holder *q_gh)
 746 {
 747         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 748         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 749         struct gfs2_holder i_gh;
 750         struct gfs2_quota_host q;
 751         char buf[sizeof(struct gfs2_quota)];
 752         struct file_ra_state ra_state;
 753         int error;
 754         struct gfs2_quota_lvb *qlvb;
 755
 756         file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
 757 restart:
 758         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 759         if (error)
 760                 return error;
 761
 762         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 763
 764         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
 765                 loff_t pos;
 766                 gfs2_glock_dq_uninit(q_gh);
 767                 error = gfs2_glock_nq_init(qd->qd_gl,
 768                                           LM_ST_EXCLUSIVE, GL_NOCACHE,
 769                                           q_gh);
 770                 if (error)
 771                         return error;
 772
 773                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 774                 if (error)
 775                         goto fail;
 776
 777                 memset(buf, 0, sizeof(struct gfs2_quota));
 778                 pos = qd2offset(qd);
 779                 error = gfs2_internal_read(ip, &ra_state, buf,
 780                                            &pos, sizeof(struct gfs2_quota));
 781                 if (error < 0)
 782                         goto fail_gunlock;
 783
 784                 gfs2_glock_dq_uninit(&i_gh);
 785
 786
 787                 gfs2_quota_in(&q, buf);
 788                 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
 789                 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
 790                 qlvb->__pad = 0;
 791                 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
 792                 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
 793                 qlvb->qb_value = cpu_to_be64(q.qu_value);
 794                 qd->qd_qb = *qlvb;
 795
 796                 if (gfs2_glock_is_blocking(qd->qd_gl)) {
 797                         gfs2_glock_dq_uninit(q_gh);
 798                         force_refresh = 0;
 799                         goto restart;
 800                 }
 801         }
 802
 803         return 0;
 804
 805 fail_gunlock:
 806         gfs2_glock_dq_uninit(&i_gh);
 807 fail:
 808         gfs2_glock_dq_uninit(q_gh);
 809         return error;
 810 }
 811
 812 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 813 {
 814         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 815         struct gfs2_alloc *al = &ip->i_alloc;
 816         unsigned int x;
 817         int error = 0;
 818
 819         gfs2_quota_hold(ip, uid, gid);
 820
 821         if (capable(CAP_SYS_RESOURCE) ||
 822             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 823                 return 0;
 824
 825         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
 826              sort_qd, NULL);
 827
 828         for (x = 0; x < al->al_qd_num; x++) {
 829                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
 830                 if (error)
 831                         break;
 832         }
 833
 834         if (!error)
 835                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
 836         else {
 837                 while (x--)
 838                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 839                 gfs2_quota_unhold(ip);
 840         }
 841
 842         return error;
 843 }
 844
 845 static int need_sync(struct gfs2_quota_data *qd)
 846 {
 847         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 848         struct gfs2_tune *gt = &sdp->sd_tune;
 849         s64 value;
 850         unsigned int num, den;
 851         int do_sync = 1;
 852
 853         if (!qd->qd_qb.qb_limit)
 854                 return 0;
 855
 856         spin_lock(&sdp->sd_quota_spin);
 857         value = qd->qd_change;
 858         spin_unlock(&sdp->sd_quota_spin);
 859
 860         spin_lock(&gt->gt_spin);
 861         num = gt->gt_quota_scale_num;
 862         den = gt->gt_quota_scale_den;
 863         spin_unlock(&gt->gt_spin);
 864
 865         if (value < 0)
 866                 do_sync = 0;
 867         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
 868                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 869                 do_sync = 0;
 870         else {
 871                 value *= gfs2_jindex_size(sdp) * num;
 872                 do_div(value, den);
 873                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
 874                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
 875                         do_sync = 0;
 876         }
 877
 878         return do_sync;
 879 }
 880
 881 void gfs2_quota_unlock(struct gfs2_inode *ip)
 882 {
 883         struct gfs2_alloc *al = &ip->i_alloc;
 884         struct gfs2_quota_data *qda[4];
 885         unsigned int count = 0;
 886         unsigned int x;
 887
 888         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
 889                 goto out;
 890
 891         for (x = 0; x < al->al_qd_num; x++) {
 892                 struct gfs2_quota_data *qd;
 893                 int sync;
 894
 895                 qd = al->al_qd[x];
 896                 sync = need_sync(qd);
 897
 898                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
 899
 900                 if (sync && qd_trylock(qd))
 901                         qda[count++] = qd;
 902         }
 903
 904         if (count) {
 905                 do_sync(count, qda);
 906                 for (x = 0; x < count; x++)
 907                         qd_unlock(qda[x]);
 908         }
 909
 910 out:
 911         gfs2_quota_unhold(ip);
 912 }
 913
 914 #define MAX_LINE 256
 915
 916 static int print_message(struct gfs2_quota_data *qd, char *type)
 917 {
 918         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
 919
 920         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
 921                sdp->sd_fsname, type,
 922                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
 923                qd->qd_id);
 924
 925         return 0;
 926 }
 927
 928 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 929 {
 930         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 931         struct gfs2_alloc *al = &ip->i_alloc;
 932         struct gfs2_quota_data *qd;
 933         s64 value;
 934         unsigned int x;
 935         int error = 0;
 936
 937         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
 938                 return 0;
 939
 940         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
 941                 return 0;
 942
 943         for (x = 0; x < al->al_qd_num; x++) {
 944                 qd = al->al_qd[x];
 945
 946                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 947                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
 948                         continue;
 949
 950                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
 951                 spin_lock(&sdp->sd_quota_spin);
 952                 value += qd->qd_change;
 953                 spin_unlock(&sdp->sd_quota_spin);
 954
 955                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
 956                         print_message(qd, "exceeded");
 957                         error = -EDQUOT;
 958                         break;
 959                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
 960                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
 961                            time_after_eq(jiffies, qd->qd_last_warn +
 962                                          gfs2_tune_get(sdp,
 963                                                 gt_quota_warn_period) * HZ)) {
 964                         error = print_message(qd, "warning");
 965                         qd->qd_last_warn = jiffies;
 966                 }
 967         }
 968
 969         return error;
 970 }
 971
 972 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
 973                        u32 uid, u32 gid)
 974 {
 975         struct gfs2_alloc *al = &ip->i_alloc;
 976         struct gfs2_quota_data *qd;
 977         unsigned int x;
 978         unsigned int found = 0;
 979
 980         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
 981                 return;
 982         if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
 983                 return;
 984
 985         for (x = 0; x < al->al_qd_num; x++) {
 986                 qd = al->al_qd[x];
 987
 988                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 989                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
 990                         do_qc(qd, change);
 991                         found++;
 992                 }
 993         }
 994 }
 995
 996 int gfs2_quota_sync(struct gfs2_sbd *sdp)
 997 {
 998         struct gfs2_quota_data **qda;
 999         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1000         unsigned int num_qd;
1001         unsigned int x;
1002         int error = 0;
1003
1004         sdp->sd_quota_sync_gen++;
1005
1006         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1007         if (!qda)
1008                 return -ENOMEM;
1009
1010         do {
1011                 num_qd = 0;
1012
1013                 for (;;) {
1014                         error = qd_fish(sdp, qda + num_qd);
1015                         if (error || !qda[num_qd])
1016                                 break;
1017                         if (++num_qd == max_qd)
1018                                 break;
1019                 }
1020
1021                 if (num_qd) {
1022                         if (!error)
1023                                 error = do_sync(num_qd, qda);
1024                         if (!error)
1025                                 for (x = 0; x < num_qd; x++)
1026                                         qda[x]->qd_sync_gen =
1027                                                 sdp->sd_quota_sync_gen;
1028
1029                         for (x = 0; x < num_qd; x++)
1030                                 qd_unlock(qda[x]);
1031                 }
1032         } while (!error && num_qd == max_qd);
1033
1034         kfree(qda);
1035
1036         return error;
1037 }
1038
1039 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1040 {
1041         struct gfs2_quota_data *qd;
1042         struct gfs2_holder q_gh;
1043         int error;
1044
1045         error = qd_get(sdp, user, id, CREATE, &qd);
1046         if (error)
1047                 return error;
1048
1049         error = do_glock(qd, FORCE, &q_gh);
1050         if (!error)
1051                 gfs2_glock_dq_uninit(&q_gh);
1052
1053         qd_put(qd);
1054
1055         return error;
1056 }
1057
1058 int gfs2_quota_init(struct gfs2_sbd *sdp)
1059 {
1060         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1061         unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
1062         unsigned int x, slot = 0;
1063         unsigned int found = 0;
1064         u64 dblock;
1065         u32 extlen = 0;
1066         int error;
1067
1068         if (!ip->i_di.di_size || ip->i_di.di_size > (64 << 20) ||
1069             ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
1070                 gfs2_consist_inode(ip);
1071                 return -EIO;
1072         }
1073         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1074         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1075
1076         error = -ENOMEM;
1077
1078         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1079                                        sizeof(unsigned char *), GFP_KERNEL);
1080         if (!sdp->sd_quota_bitmap)
1081                 return error;
1082
1083         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1084                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_KERNEL);
1085                 if (!sdp->sd_quota_bitmap[x])
1086                         goto fail;
1087         }
1088
1089         for (x = 0; x < blocks; x++) {
1090                 struct buffer_head *bh;
1091                 unsigned int y;
1092
1093                 if (!extlen) {
1094                         int new = 0;
1095                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1096                         if (error)
1097                                 goto fail;
1098                 }
1099                 error = -EIO;
1100                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1101                 if (!bh)
1102                         goto fail;
1103                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1104                         brelse(bh);
1105                         goto fail;
1106                 }
1107
1108                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1109                      y++, slot++) {
1110                         struct gfs2_quota_change_host qc;
1111                         struct gfs2_quota_data *qd;
1112
1113                         gfs2_quota_change_in(&qc, bh->b_data +
1114                                           sizeof(struct gfs2_meta_header) +
1115                                           y * sizeof(struct gfs2_quota_change));
1116                         if (!qc.qc_change)
1117                                 continue;
1118
1119                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1120                                          qc.qc_id, &qd);
1121                         if (error) {
1122                                 brelse(bh);
1123                                 goto fail;
1124                         }
1125
1126                         set_bit(QDF_CHANGE, &qd->qd_flags);
1127                         qd->qd_change = qc.qc_change;
1128                         qd->qd_slot = slot;
1129                         qd->qd_slot_count = 1;
1130                         qd->qd_last_touched = jiffies;
1131
1132                         spin_lock(&sdp->sd_quota_spin);
1133                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1134                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1135                         atomic_inc(&sdp->sd_quota_count);
1136                         spin_unlock(&sdp->sd_quota_spin);
1137
1138                         found++;
1139                 }
1140
1141                 brelse(bh);
1142                 dblock++;
1143                 extlen--;
1144         }
1145
1146         if (found)
1147                 fs_info(sdp, "found %u quota changes\n", found);
1148
1149         return 0;
1150
1151 fail:
1152         gfs2_quota_cleanup(sdp);
1153         return error;
1154 }
1155
1156 void gfs2_quota_scan(struct gfs2_sbd *sdp)
1157 {
1158         struct gfs2_quota_data *qd, *safe;
1159         LIST_HEAD(dead);
1160
1161         spin_lock(&sdp->sd_quota_spin);
1162         list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1163                 if (!qd->qd_count &&
1164                     time_after_eq(jiffies, qd->qd_last_touched +
1165                                 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1166                         list_move(&qd->qd_list, &dead);
1167                         gfs2_assert_warn(sdp,
1168                                          atomic_read(&sdp->sd_quota_count) > 0);
1169                         atomic_dec(&sdp->sd_quota_count);
1170                 }
1171         }
1172         spin_unlock(&sdp->sd_quota_spin);
1173
1174         while (!list_empty(&dead)) {
1175                 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1176                 list_del(&qd->qd_list);
1177
1178                 gfs2_assert_warn(sdp, !qd->qd_change);
1179                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1180                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1181
1182                 gfs2_lvb_unhold(qd->qd_gl);
1183                 kfree(qd);
1184         }
1185 }
1186
1187 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1188 {
1189         struct list_head *head = &sdp->sd_quota_list;
1190         struct gfs2_quota_data *qd;
1191         unsigned int x;
1192
1193         spin_lock(&sdp->sd_quota_spin);
1194         while (!list_empty(head)) {
1195                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1196
1197                 if (qd->qd_count > 1 ||
1198                     (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1199                         list_move(&qd->qd_list, head);
1200                         spin_unlock(&sdp->sd_quota_spin);
1201                         schedule();
1202                         spin_lock(&sdp->sd_quota_spin);
1203                         continue;
1204                 }
1205
1206                 list_del(&qd->qd_list);
1207                 atomic_dec(&sdp->sd_quota_count);
1208                 spin_unlock(&sdp->sd_quota_spin);
1209
1210                 if (!qd->qd_count) {
1211                         gfs2_assert_warn(sdp, !qd->qd_change);
1212                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1213                 } else
1214                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1215                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1216
1217                 gfs2_lvb_unhold(qd->qd_gl);
1218                 kfree(qd);
1219
1220                 spin_lock(&sdp->sd_quota_spin);
1221         }
1222         spin_unlock(&sdp->sd_quota_spin);
1223
1224         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1225
1226         if (sdp->sd_quota_bitmap) {
1227                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1228                         kfree(sdp->sd_quota_bitmap[x]);
1229                 kfree(sdp->sd_quota_bitmap);
1230         }
1231 }
1232