fs/xfs/xfs_trans_dquot.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2002 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_inode.h"
  14 #include "xfs_trans.h"
  15 #include "xfs_trans_priv.h"
  16 #include "xfs_quota.h"
  17 #include "xfs_qm.h"
  18 #include "xfs_trace.h"
  19 #include "xfs_error.h"
  20
  21 STATIC void     xfs_trans_alloc_dqinfo(xfs_trans_t *);
  22
  23 /*
  24  * Add the locked dquot to the transaction.
  25  * The dquot must be locked, and it cannot be associated with any
  26  * transaction.
  27  */
  28 void
  29 xfs_trans_dqjoin(
  30         struct xfs_trans        *tp,
  31         struct xfs_dquot        *dqp)
  32 {
  33         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  34         ASSERT(dqp->q_logitem.qli_dquot == dqp);
  35
  36         /*
  37          * Get a log_item_desc to point at the new item.
  38          */
  39         xfs_trans_add_item(tp, &dqp->q_logitem.qli_item);
  40 }
  41
  42 /*
  43  * This is called to mark the dquot as needing
  44  * to be logged when the transaction is committed.  The dquot must
  45  * already be associated with the given transaction.
  46  * Note that it marks the entire transaction as dirty. In the ordinary
  47  * case, this gets called via xfs_trans_commit, after the transaction
  48  * is already dirty. However, there's nothing stop this from getting
  49  * called directly, as done by xfs_qm_scall_setqlim. Hence, the TRANS_DIRTY
  50  * flag.
  51  */
  52 void
  53 xfs_trans_log_dquot(
  54         struct xfs_trans        *tp,
  55         struct xfs_dquot        *dqp)
  56 {
  57         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  58
  59         /* Upgrade the dquot to bigtime format if possible. */
  60         if (dqp->q_id != 0 &&
  61             xfs_has_bigtime(tp->t_mountp) &&
  62             !(dqp->q_type & XFS_DQTYPE_BIGTIME))
  63                 dqp->q_type |= XFS_DQTYPE_BIGTIME;
  64
  65         tp->t_flags |= XFS_TRANS_DIRTY;
  66         set_bit(XFS_LI_DIRTY, &dqp->q_logitem.qli_item.li_flags);
  67 }
  68
  69 /*
  70  * Carry forward whatever is left of the quota blk reservation to
  71  * the spanky new transaction
  72  */
  73 void
  74 xfs_trans_dup_dqinfo(
  75         struct xfs_trans        *otp,
  76         struct xfs_trans        *ntp)
  77 {
  78         struct xfs_dqtrx        *oq, *nq;
  79         int                     i, j;
  80         struct xfs_dqtrx        *oqa, *nqa;
  81         uint64_t                blk_res_used;
  82
  83         if (!otp->t_dqinfo)
  84                 return;
  85
  86         xfs_trans_alloc_dqinfo(ntp);
  87
  88         for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
  89                 oqa = otp->t_dqinfo->dqs[j];
  90                 nqa = ntp->t_dqinfo->dqs[j];
  91                 for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
  92                         blk_res_used = 0;
  93
  94                         if (oqa[i].qt_dquot == NULL)
  95                                 break;
  96                         oq = &oqa[i];
  97                         nq = &nqa[i];
  98
  99                         if (oq->qt_blk_res && oq->qt_bcount_delta > 0)
 100                                 blk_res_used = oq->qt_bcount_delta;
 101
 102                         nq->qt_dquot = oq->qt_dquot;
 103                         nq->qt_bcount_delta = nq->qt_icount_delta = 0;
 104                         nq->qt_rtbcount_delta = 0;
 105
 106                         /*
 107                          * Transfer whatever is left of the reservations.
 108                          */
 109                         nq->qt_blk_res = oq->qt_blk_res - blk_res_used;
 110                         oq->qt_blk_res = blk_res_used;
 111
 112                         nq->qt_rtblk_res = oq->qt_rtblk_res -
 113                                 oq->qt_rtblk_res_used;
 114                         oq->qt_rtblk_res = oq->qt_rtblk_res_used;
 115
 116                         nq->qt_ino_res = oq->qt_ino_res - oq->qt_ino_res_used;
 117                         oq->qt_ino_res = oq->qt_ino_res_used;
 118
 119                 }
 120         }
 121 }
 122
 123 /*
 124  * Wrap around mod_dquot to account for both user and group quotas.
 125  */
 126 void
 127 xfs_trans_mod_dquot_byino(
 128         xfs_trans_t     *tp,
 129         xfs_inode_t     *ip,
 130         uint            field,
 131         int64_t         delta)
 132 {
 133         xfs_mount_t     *mp = tp->t_mountp;
 134
 135         if (!XFS_IS_QUOTA_ON(mp) ||
 136             xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 137                 return;
 138
 139         if (XFS_IS_UQUOTA_ON(mp) && ip->i_udquot)
 140                 (void) xfs_trans_mod_dquot(tp, ip->i_udquot, field, delta);
 141         if (XFS_IS_GQUOTA_ON(mp) && ip->i_gdquot)
 142                 (void) xfs_trans_mod_dquot(tp, ip->i_gdquot, field, delta);
 143         if (XFS_IS_PQUOTA_ON(mp) && ip->i_pdquot)
 144                 (void) xfs_trans_mod_dquot(tp, ip->i_pdquot, field, delta);
 145 }
 146
 147 STATIC struct xfs_dqtrx *
 148 xfs_trans_get_dqtrx(
 149         struct xfs_trans        *tp,
 150         struct xfs_dquot        *dqp)
 151 {
 152         int                     i;
 153         struct xfs_dqtrx        *qa;
 154
 155         switch (xfs_dquot_type(dqp)) {
 156         case XFS_DQTYPE_USER:
 157                 qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_USR];
 158                 break;
 159         case XFS_DQTYPE_GROUP:
 160                 qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_GRP];
 161                 break;
 162         case XFS_DQTYPE_PROJ:
 163                 qa = tp->t_dqinfo->dqs[XFS_QM_TRANS_PRJ];
 164                 break;
 165         default:
 166                 return NULL;
 167         }
 168
 169         for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
 170                 if (qa[i].qt_dquot == NULL ||
 171                     qa[i].qt_dquot == dqp)
 172                         return &qa[i];
 173         }
 174
 175         return NULL;
 176 }
 177
 178 /*
 179  * Make the changes in the transaction structure.
 180  * The moral equivalent to xfs_trans_mod_sb().
 181  * We don't touch any fields in the dquot, so we don't care
 182  * if it's locked or not (most of the time it won't be).
 183  */
 184 void
 185 xfs_trans_mod_dquot(
 186         struct xfs_trans        *tp,
 187         struct xfs_dquot        *dqp,
 188         uint                    field,
 189         int64_t                 delta)
 190 {
 191         struct xfs_dqtrx        *qtrx;
 192
 193         ASSERT(tp);
 194         ASSERT(XFS_IS_QUOTA_ON(tp->t_mountp));
 195         qtrx = NULL;
 196
 197         if (!delta)
 198                 return;
 199
 200         if (tp->t_dqinfo == NULL)
 201                 xfs_trans_alloc_dqinfo(tp);
 202         /*
 203          * Find either the first free slot or the slot that belongs
 204          * to this dquot.
 205          */
 206         qtrx = xfs_trans_get_dqtrx(tp, dqp);
 207         ASSERT(qtrx);
 208         if (qtrx->qt_dquot == NULL)
 209                 qtrx->qt_dquot = dqp;
 210
 211         trace_xfs_trans_mod_dquot_before(qtrx);
 212         trace_xfs_trans_mod_dquot(tp, dqp, field, delta);
 213
 214         switch (field) {
 215         /* regular disk blk reservation */
 216         case XFS_TRANS_DQ_RES_BLKS:
 217                 qtrx->qt_blk_res += delta;
 218                 break;
 219
 220         /* inode reservation */
 221         case XFS_TRANS_DQ_RES_INOS:
 222                 qtrx->qt_ino_res += delta;
 223                 break;
 224
 225         /* disk blocks used. */
 226         case XFS_TRANS_DQ_BCOUNT:
 227                 qtrx->qt_bcount_delta += delta;
 228                 break;
 229
 230         case XFS_TRANS_DQ_DELBCOUNT:
 231                 qtrx->qt_delbcnt_delta += delta;
 232                 break;
 233
 234         /* Inode Count */
 235         case XFS_TRANS_DQ_ICOUNT:
 236                 if (qtrx->qt_ino_res && delta > 0) {
 237                         qtrx->qt_ino_res_used += delta;
 238                         ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
 239                 }
 240                 qtrx->qt_icount_delta += delta;
 241                 break;
 242
 243         /* rtblk reservation */
 244         case XFS_TRANS_DQ_RES_RTBLKS:
 245                 qtrx->qt_rtblk_res += delta;
 246                 break;
 247
 248         /* rtblk count */
 249         case XFS_TRANS_DQ_RTBCOUNT:
 250                 if (qtrx->qt_rtblk_res && delta > 0) {
 251                         qtrx->qt_rtblk_res_used += delta;
 252                         ASSERT(qtrx->qt_rtblk_res >= qtrx->qt_rtblk_res_used);
 253                 }
 254                 qtrx->qt_rtbcount_delta += delta;
 255                 break;
 256
 257         case XFS_TRANS_DQ_DELRTBCOUNT:
 258                 qtrx->qt_delrtb_delta += delta;
 259                 break;
 260
 261         default:
 262                 ASSERT(0);
 263         }
 264
 265         trace_xfs_trans_mod_dquot_after(qtrx);
 266 }
 267
 268
 269 /*
 270  * Given an array of dqtrx structures, lock all the dquots associated and join
 271  * them to the transaction, provided they have been modified.  We know that the
 272  * highest number of dquots of one type - usr, grp and prj - involved in a
 273  * transaction is 3 so we don't need to make this very generic.
 274  */
 275 STATIC void
 276 xfs_trans_dqlockedjoin(
 277         struct xfs_trans        *tp,
 278         struct xfs_dqtrx        *q)
 279 {
 280         ASSERT(q[0].qt_dquot != NULL);
 281         if (q[1].qt_dquot == NULL) {
 282                 xfs_dqlock(q[0].qt_dquot);
 283                 xfs_trans_dqjoin(tp, q[0].qt_dquot);
 284         } else {
 285                 ASSERT(XFS_QM_TRANS_MAXDQS == 2);
 286                 xfs_dqlock2(q[0].qt_dquot, q[1].qt_dquot);
 287                 xfs_trans_dqjoin(tp, q[0].qt_dquot);
 288                 xfs_trans_dqjoin(tp, q[1].qt_dquot);
 289         }
 290 }
 291
 292 /* Apply dqtrx changes to the quota reservation counters. */
 293 static inline void
 294 xfs_apply_quota_reservation_deltas(
 295         struct xfs_dquot_res    *res,
 296         uint64_t                reserved,
 297         int64_t                 res_used,
 298         int64_t                 count_delta)
 299 {
 300         if (reserved != 0) {
 301                 /*
 302                  * Subtle math here: If reserved > res_used (the normal case),
 303                  * we're simply subtracting the unused transaction quota
 304                  * reservation from the dquot reservation.
 305                  *
 306                  * If, however, res_used > reserved, then we have allocated
 307                  * more quota blocks than were reserved for the transaction.
 308                  * We must add that excess to the dquot reservation since it
 309                  * tracks (usage + resv) and by definition we didn't reserve
 310                  * that excess.
 311                  */
 312                 res->reserved -= abs(reserved - res_used);
 313         } else if (count_delta != 0) {
 314                 /*
 315                  * These blks were never reserved, either inside a transaction
 316                  * or outside one (in a delayed allocation). Also, this isn't
 317                  * always a negative number since we sometimes deliberately
 318                  * skip quota reservations.
 319                  */
 320                 res->reserved += count_delta;
 321         }
 322 }
 323
 324 /*
 325  * Called by xfs_trans_commit() and similar in spirit to
 326  * xfs_trans_apply_sb_deltas().
 327  * Go thru all the dquots belonging to this transaction and modify the
 328  * INCORE dquot to reflect the actual usages.
 329  * Unreserve just the reservations done by this transaction.
 330  * dquot is still left locked at exit.
 331  */
 332 void
 333 xfs_trans_apply_dquot_deltas(
 334         struct xfs_trans        *tp)
 335 {
 336         int                     i, j;
 337         struct xfs_dquot        *dqp;
 338         struct xfs_dqtrx        *qtrx, *qa;
 339         int64_t                 totalbdelta;
 340         int64_t                 totalrtbdelta;
 341
 342         if (!tp->t_dqinfo)
 343                 return;
 344
 345         ASSERT(tp->t_dqinfo);
 346         for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
 347                 qa = tp->t_dqinfo->dqs[j];
 348                 if (qa[0].qt_dquot == NULL)
 349                         continue;
 350
 351                 /*
 352                  * Lock all of the dquots and join them to the transaction.
 353                  */
 354                 xfs_trans_dqlockedjoin(tp, qa);
 355
 356                 for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
 357                         uint64_t        blk_res_used;
 358
 359                         qtrx = &qa[i];
 360                         /*
 361                          * The array of dquots is filled
 362                          * sequentially, not sparsely.
 363                          */
 364                         if ((dqp = qtrx->qt_dquot) == NULL)
 365                                 break;
 366
 367                         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 368
 369                         /*
 370                          * adjust the actual number of blocks used
 371                          */
 372
 373                         /*
 374                          * The issue here is - sometimes we don't make a blkquota
 375                          * reservation intentionally to be fair to users
 376                          * (when the amount is small). On the other hand,
 377                          * delayed allocs do make reservations, but that's
 378                          * outside of a transaction, so we have no
 379                          * idea how much was really reserved.
 380                          * So, here we've accumulated delayed allocation blks and
 381                          * non-delay blks. The assumption is that the
 382                          * delayed ones are always reserved (outside of a
 383                          * transaction), and the others may or may not have
 384                          * quota reservations.
 385                          */
 386                         totalbdelta = qtrx->qt_bcount_delta +
 387                                 qtrx->qt_delbcnt_delta;
 388                         totalrtbdelta = qtrx->qt_rtbcount_delta +
 389                                 qtrx->qt_delrtb_delta;
 390
 391                         if (totalbdelta != 0 || totalrtbdelta != 0 ||
 392                             qtrx->qt_icount_delta != 0) {
 393                                 trace_xfs_trans_apply_dquot_deltas_before(dqp);
 394                                 trace_xfs_trans_apply_dquot_deltas(qtrx);
 395                         }
 396
 397 #ifdef DEBUG
 398                         if (totalbdelta < 0)
 399                                 ASSERT(dqp->q_blk.count >= -totalbdelta);
 400
 401                         if (totalrtbdelta < 0)
 402                                 ASSERT(dqp->q_rtb.count >= -totalrtbdelta);
 403
 404                         if (qtrx->qt_icount_delta < 0)
 405                                 ASSERT(dqp->q_ino.count >= -qtrx->qt_icount_delta);
 406 #endif
 407                         if (totalbdelta)
 408                                 dqp->q_blk.count += totalbdelta;
 409
 410                         if (qtrx->qt_icount_delta)
 411                                 dqp->q_ino.count += qtrx->qt_icount_delta;
 412
 413                         if (totalrtbdelta)
 414                                 dqp->q_rtb.count += totalrtbdelta;
 415
 416                         if (totalbdelta != 0 || totalrtbdelta != 0 ||
 417                             qtrx->qt_icount_delta != 0)
 418                                 trace_xfs_trans_apply_dquot_deltas_after(dqp);
 419
 420                         /*
 421                          * Get any default limits in use.
 422                          * Start/reset the timer(s) if needed.
 423                          */
 424                         if (dqp->q_id) {
 425                                 xfs_qm_adjust_dqlimits(dqp);
 426                                 xfs_qm_adjust_dqtimers(dqp);
 427                         }
 428
 429                         dqp->q_flags |= XFS_DQFLAG_DIRTY;
 430                         /*
 431                          * add this to the list of items to get logged
 432                          */
 433                         xfs_trans_log_dquot(tp, dqp);
 434                         /*
 435                          * Take off what's left of the original reservation.
 436                          * In case of delayed allocations, there's no
 437                          * reservation that a transaction structure knows of.
 438                          */
 439                         blk_res_used = max_t(int64_t, 0, qtrx->qt_bcount_delta);
 440                         xfs_apply_quota_reservation_deltas(&dqp->q_blk,
 441                                         qtrx->qt_blk_res, blk_res_used,
 442                                         qtrx->qt_bcount_delta);
 443
 444                         /*
 445                          * Adjust the RT reservation.
 446                          */
 447                         xfs_apply_quota_reservation_deltas(&dqp->q_rtb,
 448                                         qtrx->qt_rtblk_res,
 449                                         qtrx->qt_rtblk_res_used,
 450                                         qtrx->qt_rtbcount_delta);
 451
 452                         /*
 453                          * Adjust the inode reservation.
 454                          */
 455                         ASSERT(qtrx->qt_ino_res >= qtrx->qt_ino_res_used);
 456                         xfs_apply_quota_reservation_deltas(&dqp->q_ino,
 457                                         qtrx->qt_ino_res,
 458                                         qtrx->qt_ino_res_used,
 459                                         qtrx->qt_icount_delta);
 460
 461                         ASSERT(dqp->q_blk.reserved >= dqp->q_blk.count);
 462                         ASSERT(dqp->q_ino.reserved >= dqp->q_ino.count);
 463                         ASSERT(dqp->q_rtb.reserved >= dqp->q_rtb.count);
 464                 }
 465         }
 466 }
 467
 468 /*
 469  * Release the reservations, and adjust the dquots accordingly.
 470  * This is called only when the transaction is being aborted. If by
 471  * any chance we have done dquot modifications incore (ie. deltas) already,
 472  * we simply throw those away, since that's the expected behavior
 473  * when a transaction is curtailed without a commit.
 474  */
 475 void
 476 xfs_trans_unreserve_and_mod_dquots(
 477         struct xfs_trans        *tp)
 478 {
 479         int                     i, j;
 480         struct xfs_dquot        *dqp;
 481         struct xfs_dqtrx        *qtrx, *qa;
 482         bool                    locked;
 483
 484         if (!tp->t_dqinfo)
 485                 return;
 486
 487         for (j = 0; j < XFS_QM_TRANS_DQTYPES; j++) {
 488                 qa = tp->t_dqinfo->dqs[j];
 489
 490                 for (i = 0; i < XFS_QM_TRANS_MAXDQS; i++) {
 491                         qtrx = &qa[i];
 492                         /*
 493                          * We assume that the array of dquots is filled
 494                          * sequentially, not sparsely.
 495                          */
 496                         if ((dqp = qtrx->qt_dquot) == NULL)
 497                                 break;
 498                         /*
 499                          * Unreserve the original reservation. We don't care
 500                          * about the number of blocks used field, or deltas.
 501                          * Also we don't bother to zero the fields.
 502                          */
 503                         locked = false;
 504                         if (qtrx->qt_blk_res) {
 505                                 xfs_dqlock(dqp);
 506                                 locked = true;
 507                                 dqp->q_blk.reserved -=
 508                                         (xfs_qcnt_t)qtrx->qt_blk_res;
 509                         }
 510                         if (qtrx->qt_ino_res) {
 511                                 if (!locked) {
 512                                         xfs_dqlock(dqp);
 513                                         locked = true;
 514                                 }
 515                                 dqp->q_ino.reserved -=
 516                                         (xfs_qcnt_t)qtrx->qt_ino_res;
 517                         }
 518
 519                         if (qtrx->qt_rtblk_res) {
 520                                 if (!locked) {
 521                                         xfs_dqlock(dqp);
 522                                         locked = true;
 523                                 }
 524                                 dqp->q_rtb.reserved -=
 525                                         (xfs_qcnt_t)qtrx->qt_rtblk_res;
 526                         }
 527                         if (locked)
 528                                 xfs_dqunlock(dqp);
 529
 530                 }
 531         }
 532 }
 533
 534 STATIC void
 535 xfs_quota_warn(
 536         struct xfs_mount        *mp,
 537         struct xfs_dquot        *dqp,
 538         int                     type)
 539 {
 540         enum quota_type         qtype;
 541
 542         switch (xfs_dquot_type(dqp)) {
 543         case XFS_DQTYPE_PROJ:
 544                 qtype = PRJQUOTA;
 545                 break;
 546         case XFS_DQTYPE_USER:
 547                 qtype = USRQUOTA;
 548                 break;
 549         case XFS_DQTYPE_GROUP:
 550                 qtype = GRPQUOTA;
 551                 break;
 552         default:
 553                 return;
 554         }
 555
 556         quota_send_warning(make_kqid(&init_user_ns, qtype, dqp->q_id),
 557                            mp->m_super->s_dev, type);
 558 }
 559
 560 /*
 561  * Decide if we can make an additional reservation against a quota resource.
 562  * Returns an inode QUOTA_NL_ warning code and whether or not it's fatal.
 563  *
 564  * Note that we assume that the numeric difference between the inode and block
 565  * warning codes will always be 3 since it's userspace ABI now, and will never
 566  * decrease the quota reservation, so the *BELOW messages are irrelevant.
 567  */
 568 static inline int
 569 xfs_dqresv_check(
 570         struct xfs_dquot_res    *res,
 571         struct xfs_quota_limits *qlim,
 572         int64_t                 delta,
 573         bool                    *fatal)
 574 {
 575         xfs_qcnt_t              hardlimit = res->hardlimit;
 576         xfs_qcnt_t              softlimit = res->softlimit;
 577         xfs_qcnt_t              total_count = res->reserved + delta;
 578
 579         BUILD_BUG_ON(QUOTA_NL_BHARDWARN     != QUOTA_NL_IHARDWARN + 3);
 580         BUILD_BUG_ON(QUOTA_NL_BSOFTLONGWARN != QUOTA_NL_ISOFTLONGWARN + 3);
 581         BUILD_BUG_ON(QUOTA_NL_BSOFTWARN     != QUOTA_NL_ISOFTWARN + 3);
 582
 583         *fatal = false;
 584         if (delta <= 0)
 585                 return QUOTA_NL_NOWARN;
 586
 587         if (!hardlimit)
 588                 hardlimit = qlim->hard;
 589         if (!softlimit)
 590                 softlimit = qlim->soft;
 591
 592         if (hardlimit && total_count > hardlimit) {
 593                 *fatal = true;
 594                 return QUOTA_NL_IHARDWARN;
 595         }
 596
 597         if (softlimit && total_count > softlimit) {
 598                 time64_t        now = ktime_get_real_seconds();
 599
 600                 if (res->timer != 0 && now > res->timer) {
 601                         *fatal = true;
 602                         return QUOTA_NL_ISOFTLONGWARN;
 603                 }
 604
 605                 return QUOTA_NL_ISOFTWARN;
 606         }
 607
 608         return QUOTA_NL_NOWARN;
 609 }
 610
 611 /*
 612  * This reserves disk blocks and inodes against a dquot.
 613  * Flags indicate if the dquot is to be locked here and also
 614  * if the blk reservation is for RT or regular blocks.
 615  * Sending in XFS_QMOPT_FORCE_RES flag skips the quota check.
 616  */
 617 STATIC int
 618 xfs_trans_dqresv(
 619         struct xfs_trans        *tp,
 620         struct xfs_mount        *mp,
 621         struct xfs_dquot        *dqp,
 622         int64_t                 nblks,
 623         long                    ninos,
 624         uint                    flags)
 625 {
 626         struct xfs_quotainfo    *q = mp->m_quotainfo;
 627         struct xfs_def_quota    *defq;
 628         struct xfs_dquot_res    *blkres;
 629         struct xfs_quota_limits *qlim;
 630
 631         xfs_dqlock(dqp);
 632
 633         defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
 634
 635         if (flags & XFS_TRANS_DQ_RES_BLKS) {
 636                 blkres = &dqp->q_blk;
 637                 qlim = &defq->blk;
 638         } else {
 639                 blkres = &dqp->q_rtb;
 640                 qlim = &defq->rtb;
 641         }
 642
 643         if ((flags & XFS_QMOPT_FORCE_RES) == 0 && dqp->q_id &&
 644             xfs_dquot_is_enforced(dqp)) {
 645                 int             quota_nl;
 646                 bool            fatal;
 647
 648                 /*
 649                  * dquot is locked already. See if we'd go over the hardlimit
 650                  * or exceed the timelimit if we'd reserve resources.
 651                  */
 652                 quota_nl = xfs_dqresv_check(blkres, qlim, nblks, &fatal);
 653                 if (quota_nl != QUOTA_NL_NOWARN) {
 654                         /*
 655                          * Quota block warning codes are 3 more than the inode
 656                          * codes, which we check above.
 657                          */
 658                         xfs_quota_warn(mp, dqp, quota_nl + 3);
 659                         if (fatal)
 660                                 goto error_return;
 661                 }
 662
 663                 quota_nl = xfs_dqresv_check(&dqp->q_ino, &defq->ino, ninos,
 664                                 &fatal);
 665                 if (quota_nl != QUOTA_NL_NOWARN) {
 666                         xfs_quota_warn(mp, dqp, quota_nl);
 667                         if (fatal)
 668                                 goto error_return;
 669                 }
 670         }
 671
 672         /*
 673          * Change the reservation, but not the actual usage.
 674          * Note that q_blk.reserved = q_blk.count + resv
 675          */
 676         blkres->reserved += (xfs_qcnt_t)nblks;
 677         dqp->q_ino.reserved += (xfs_qcnt_t)ninos;
 678
 679         /*
 680          * note the reservation amt in the trans struct too,
 681          * so that the transaction knows how much was reserved by
 682          * it against this particular dquot.
 683          * We don't do this when we are reserving for a delayed allocation,
 684          * because we don't have the luxury of a transaction envelope then.
 685          */
 686         if (tp) {
 687                 ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
 688                 xfs_trans_mod_dquot(tp, dqp, flags & XFS_QMOPT_RESBLK_MASK,
 689                                     nblks);
 690                 xfs_trans_mod_dquot(tp, dqp, XFS_TRANS_DQ_RES_INOS, ninos);
 691         }
 692
 693         if (XFS_IS_CORRUPT(mp, dqp->q_blk.reserved < dqp->q_blk.count) ||
 694             XFS_IS_CORRUPT(mp, dqp->q_rtb.reserved < dqp->q_rtb.count) ||
 695             XFS_IS_CORRUPT(mp, dqp->q_ino.reserved < dqp->q_ino.count))
 696                 goto error_corrupt;
 697
 698         xfs_dqunlock(dqp);
 699         return 0;
 700
 701 error_return:
 702         xfs_dqunlock(dqp);
 703         if (xfs_dquot_type(dqp) == XFS_DQTYPE_PROJ)
 704                 return -ENOSPC;
 705         return -EDQUOT;
 706 error_corrupt:
 707         xfs_dqunlock(dqp);
 708         xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 709         return -EFSCORRUPTED;
 710 }
 711
 712
 713 /*
 714  * Given dquot(s), make disk block and/or inode reservations against them.
 715  * The fact that this does the reservation against user, group and
 716  * project quotas is important, because this follows a all-or-nothing
 717  * approach.
 718  *
 719  * flags = XFS_QMOPT_FORCE_RES evades limit enforcement. Used by chown.
 720  *         XFS_QMOPT_ENOSPC returns ENOSPC not EDQUOT.  Used by pquota.
 721  *         XFS_TRANS_DQ_RES_BLKS reserves regular disk blocks
 722  *         XFS_TRANS_DQ_RES_RTBLKS reserves realtime disk blocks
 723  * dquots are unlocked on return, if they were not locked by caller.
 724  */
 725 int
 726 xfs_trans_reserve_quota_bydquots(
 727         struct xfs_trans        *tp,
 728         struct xfs_mount        *mp,
 729         struct xfs_dquot        *udqp,
 730         struct xfs_dquot        *gdqp,
 731         struct xfs_dquot        *pdqp,
 732         int64_t                 nblks,
 733         long                    ninos,
 734         uint                    flags)
 735 {
 736         int             error;
 737
 738         if (!XFS_IS_QUOTA_ON(mp))
 739                 return 0;
 740
 741         ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
 742
 743         if (udqp) {
 744                 error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos, flags);
 745                 if (error)
 746                         return error;
 747         }
 748
 749         if (gdqp) {
 750                 error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
 751                 if (error)
 752                         goto unwind_usr;
 753         }
 754
 755         if (pdqp) {
 756                 error = xfs_trans_dqresv(tp, mp, pdqp, nblks, ninos, flags);
 757                 if (error)
 758                         goto unwind_grp;
 759         }
 760
 761         /*
 762          * Didn't change anything critical, so, no need to log
 763          */
 764         return 0;
 765
 766 unwind_grp:
 767         flags |= XFS_QMOPT_FORCE_RES;
 768         if (gdqp)
 769                 xfs_trans_dqresv(tp, mp, gdqp, -nblks, -ninos, flags);
 770 unwind_usr:
 771         flags |= XFS_QMOPT_FORCE_RES;
 772         if (udqp)
 773                 xfs_trans_dqresv(tp, mp, udqp, -nblks, -ninos, flags);
 774         return error;
 775 }
 776
 777
 778 /*
 779  * Lock the dquot and change the reservation if we can.
 780  * This doesn't change the actual usage, just the reservation.
 781  * The inode sent in is locked.
 782  */
 783 int
 784 xfs_trans_reserve_quota_nblks(
 785         struct xfs_trans        *tp,
 786         struct xfs_inode        *ip,
 787         int64_t                 dblocks,
 788         int64_t                 rblocks,
 789         bool                    force)
 790 {
 791         struct xfs_mount        *mp = ip->i_mount;
 792         unsigned int            qflags = 0;
 793         int                     error;
 794
 795         if (!XFS_IS_QUOTA_ON(mp))
 796                 return 0;
 797
 798         ASSERT(!xfs_is_quota_inode(&mp->m_sb, ip->i_ino));
 799         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 800
 801         if (force)
 802                 qflags |= XFS_QMOPT_FORCE_RES;
 803
 804         /* Reserve data device quota against the inode's dquots. */
 805         error = xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
 806                         ip->i_gdquot, ip->i_pdquot, dblocks, 0,
 807                         XFS_QMOPT_RES_REGBLKS | qflags);
 808         if (error)
 809                 return error;
 810
 811         /* Do the same but for realtime blocks. */
 812         error = xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
 813                         ip->i_gdquot, ip->i_pdquot, rblocks, 0,
 814                         XFS_QMOPT_RES_RTBLKS | qflags);
 815         if (error) {
 816                 xfs_trans_reserve_quota_bydquots(tp, mp, ip->i_udquot,
 817                                 ip->i_gdquot, ip->i_pdquot, -dblocks, 0,
 818                                 XFS_QMOPT_RES_REGBLKS);
 819                 return error;
 820         }
 821
 822         return 0;
 823 }
 824
 825 /* Change the quota reservations for an inode creation activity. */
 826 int
 827 xfs_trans_reserve_quota_icreate(
 828         struct xfs_trans        *tp,
 829         struct xfs_dquot        *udqp,
 830         struct xfs_dquot        *gdqp,
 831         struct xfs_dquot        *pdqp,
 832         int64_t                 dblocks)
 833 {
 834         struct xfs_mount        *mp = tp->t_mountp;
 835
 836         if (!XFS_IS_QUOTA_ON(mp))
 837                 return 0;
 838
 839         return xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp, pdqp,
 840                         dblocks, 1, XFS_QMOPT_RES_REGBLKS);
 841 }
 842
 843 STATIC void
 844 xfs_trans_alloc_dqinfo(
 845         xfs_trans_t     *tp)
 846 {
 847         tp->t_dqinfo = kmem_cache_zalloc(xfs_dqtrx_cache,
 848                                          GFP_KERNEL | __GFP_NOFAIL);
 849 }
 850
 851 void
 852 xfs_trans_free_dqinfo(
 853         xfs_trans_t     *tp)
 854 {
 855         if (!tp->t_dqinfo)
 856                 return;
 857         kmem_cache_free(xfs_dqtrx_cache, tp->t_dqinfo);
 858         tp->t_dqinfo = NULL;
 859 }