linux/fs/xfs/xfs_qm.c
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   1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_bit.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_alloc.h"
  26#include "xfs_quota.h"
  27#include "xfs_mount.h"
  28#include "xfs_bmap_btree.h"
  29#include "xfs_ialloc_btree.h"
  30#include "xfs_dinode.h"
  31#include "xfs_inode.h"
  32#include "xfs_ialloc.h"
  33#include "xfs_itable.h"
  34#include "xfs_rtalloc.h"
  35#include "xfs_error.h"
  36#include "xfs_bmap.h"
  37#include "xfs_attr.h"
  38#include "xfs_buf_item.h"
  39#include "xfs_trans_space.h"
  40#include "xfs_utils.h"
  41#include "xfs_qm.h"
  42#include "xfs_trace.h"
  43#include "xfs_icache.h"
  44#include "xfs_cksum.h"
  45
  46/*
  47 * The global quota manager. There is only one of these for the entire
  48 * system, _not_ one per file system. XQM keeps track of the overall
  49 * quota functionality, including maintaining the freelist and hash
  50 * tables of dquots.
  51 */
  52STATIC int      xfs_qm_init_quotainos(xfs_mount_t *);
  53STATIC int      xfs_qm_init_quotainfo(xfs_mount_t *);
  54STATIC int      xfs_qm_shake(struct shrinker *, struct shrink_control *);
  55
  56/*
  57 * We use the batch lookup interface to iterate over the dquots as it
  58 * currently is the only interface into the radix tree code that allows
  59 * fuzzy lookups instead of exact matches.  Holding the lock over multiple
  60 * operations is fine as all callers are used either during mount/umount
  61 * or quotaoff.
  62 */
  63#define XFS_DQ_LOOKUP_BATCH     32
  64
  65STATIC int
  66xfs_qm_dquot_walk(
  67        struct xfs_mount        *mp,
  68        int                     type,
  69        int                     (*execute)(struct xfs_dquot *dqp, void *data),
  70        void                    *data)
  71{
  72        struct xfs_quotainfo    *qi = mp->m_quotainfo;
  73        struct radix_tree_root  *tree = xfs_dquot_tree(qi, type);
  74        uint32_t                next_index;
  75        int                     last_error = 0;
  76        int                     skipped;
  77        int                     nr_found;
  78
  79restart:
  80        skipped = 0;
  81        next_index = 0;
  82        nr_found = 0;
  83
  84        while (1) {
  85                struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
  86                int             error = 0;
  87                int             i;
  88
  89                mutex_lock(&qi->qi_tree_lock);
  90                nr_found = radix_tree_gang_lookup(tree, (void **)batch,
  91                                        next_index, XFS_DQ_LOOKUP_BATCH);
  92                if (!nr_found) {
  93                        mutex_unlock(&qi->qi_tree_lock);
  94                        break;
  95                }
  96
  97                for (i = 0; i < nr_found; i++) {
  98                        struct xfs_dquot *dqp = batch[i];
  99
 100                        next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
 101
 102                        error = execute(batch[i], data);
 103                        if (error == EAGAIN) {
 104                                skipped++;
 105                                continue;
 106                        }
 107                        if (error && last_error != EFSCORRUPTED)
 108                                last_error = error;
 109                }
 110
 111                mutex_unlock(&qi->qi_tree_lock);
 112
 113                /* bail out if the filesystem is corrupted.  */
 114                if (last_error == EFSCORRUPTED) {
 115                        skipped = 0;
 116                        break;
 117                }
 118        }
 119
 120        if (skipped) {
 121                delay(1);
 122                goto restart;
 123        }
 124
 125        return last_error;
 126}
 127
 128
 129/*
 130 * Purge a dquot from all tracking data structures and free it.
 131 */
 132STATIC int
 133xfs_qm_dqpurge(
 134        struct xfs_dquot        *dqp,
 135        void                    *data)
 136{
 137        struct xfs_mount        *mp = dqp->q_mount;
 138        struct xfs_quotainfo    *qi = mp->m_quotainfo;
 139        struct xfs_dquot        *gdqp = NULL;
 140        struct xfs_dquot        *pdqp = NULL;
 141
 142        xfs_dqlock(dqp);
 143        if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
 144                xfs_dqunlock(dqp);
 145                return EAGAIN;
 146        }
 147
 148        /*
 149         * If this quota has a hint attached, prepare for releasing it now.
 150         */
 151        gdqp = dqp->q_gdquot;
 152        if (gdqp) {
 153                xfs_dqlock(gdqp);
 154                dqp->q_gdquot = NULL;
 155        }
 156
 157        pdqp = dqp->q_pdquot;
 158        if (pdqp) {
 159                xfs_dqlock(pdqp);
 160                dqp->q_pdquot = NULL;
 161        }
 162
 163        dqp->dq_flags |= XFS_DQ_FREEING;
 164
 165        xfs_dqflock(dqp);
 166
 167        /*
 168         * If we are turning this type of quotas off, we don't care
 169         * about the dirty metadata sitting in this dquot. OTOH, if
 170         * we're unmounting, we do care, so we flush it and wait.
 171         */
 172        if (XFS_DQ_IS_DIRTY(dqp)) {
 173                struct xfs_buf  *bp = NULL;
 174                int             error;
 175
 176                /*
 177                 * We don't care about getting disk errors here. We need
 178                 * to purge this dquot anyway, so we go ahead regardless.
 179                 */
 180                error = xfs_qm_dqflush(dqp, &bp);
 181                if (error) {
 182                        xfs_warn(mp, "%s: dquot %p flush failed",
 183                                __func__, dqp);
 184                } else {
 185                        error = xfs_bwrite(bp);
 186                        xfs_buf_relse(bp);
 187                }
 188                xfs_dqflock(dqp);
 189        }
 190
 191        ASSERT(atomic_read(&dqp->q_pincount) == 0);
 192        ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
 193               !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
 194
 195        xfs_dqfunlock(dqp);
 196        xfs_dqunlock(dqp);
 197
 198        radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
 199                          be32_to_cpu(dqp->q_core.d_id));
 200        qi->qi_dquots--;
 201
 202        /*
 203         * We move dquots to the freelist as soon as their reference count
 204         * hits zero, so it really should be on the freelist here.
 205         */
 206        mutex_lock(&qi->qi_lru_lock);
 207        ASSERT(!list_empty(&dqp->q_lru));
 208        list_del_init(&dqp->q_lru);
 209        qi->qi_lru_count--;
 210        XFS_STATS_DEC(xs_qm_dquot_unused);
 211        mutex_unlock(&qi->qi_lru_lock);
 212
 213        xfs_qm_dqdestroy(dqp);
 214
 215        if (gdqp)
 216                xfs_qm_dqput(gdqp);
 217        if (pdqp)
 218                xfs_qm_dqput(pdqp);
 219        return 0;
 220}
 221
 222/*
 223 * Purge the dquot cache.
 224 */
 225void
 226xfs_qm_dqpurge_all(
 227        struct xfs_mount        *mp,
 228        uint                    flags)
 229{
 230        if (flags & XFS_QMOPT_UQUOTA)
 231                xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge, NULL);
 232        if (flags & XFS_QMOPT_GQUOTA)
 233                xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge, NULL);
 234        if (flags & XFS_QMOPT_PQUOTA)
 235                xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge, NULL);
 236}
 237
 238/*
 239 * Just destroy the quotainfo structure.
 240 */
 241void
 242xfs_qm_unmount(
 243        struct xfs_mount        *mp)
 244{
 245        if (mp->m_quotainfo) {
 246                xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
 247                xfs_qm_destroy_quotainfo(mp);
 248        }
 249}
 250
 251
 252/*
 253 * This is called from xfs_mountfs to start quotas and initialize all
 254 * necessary data structures like quotainfo.  This is also responsible for
 255 * running a quotacheck as necessary.  We are guaranteed that the superblock
 256 * is consistently read in at this point.
 257 *
 258 * If we fail here, the mount will continue with quota turned off. We don't
 259 * need to inidicate success or failure at all.
 260 */
 261void
 262xfs_qm_mount_quotas(
 263        xfs_mount_t     *mp)
 264{
 265        int             error = 0;
 266        uint            sbf;
 267
 268        /*
 269         * If quotas on realtime volumes is not supported, we disable
 270         * quotas immediately.
 271         */
 272        if (mp->m_sb.sb_rextents) {
 273                xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
 274                mp->m_qflags = 0;
 275                goto write_changes;
 276        }
 277
 278        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 279
 280        /*
 281         * Allocate the quotainfo structure inside the mount struct, and
 282         * create quotainode(s), and change/rev superblock if necessary.
 283         */
 284        error = xfs_qm_init_quotainfo(mp);
 285        if (error) {
 286                /*
 287                 * We must turn off quotas.
 288                 */
 289                ASSERT(mp->m_quotainfo == NULL);
 290                mp->m_qflags = 0;
 291                goto write_changes;
 292        }
 293        /*
 294         * If any of the quotas are not consistent, do a quotacheck.
 295         */
 296        if (XFS_QM_NEED_QUOTACHECK(mp)) {
 297                error = xfs_qm_quotacheck(mp);
 298                if (error) {
 299                        /* Quotacheck failed and disabled quotas. */
 300                        return;
 301                }
 302        }
 303        /* 
 304         * If one type of quotas is off, then it will lose its
 305         * quotachecked status, since we won't be doing accounting for
 306         * that type anymore.
 307         */
 308        if (!XFS_IS_UQUOTA_ON(mp))
 309                mp->m_qflags &= ~XFS_UQUOTA_CHKD;
 310        if (!XFS_IS_GQUOTA_ON(mp))
 311                mp->m_qflags &= ~XFS_GQUOTA_CHKD;
 312        if (!XFS_IS_PQUOTA_ON(mp))
 313                mp->m_qflags &= ~XFS_PQUOTA_CHKD;
 314
 315 write_changes:
 316        /*
 317         * We actually don't have to acquire the m_sb_lock at all.
 318         * This can only be called from mount, and that's single threaded. XXX
 319         */
 320        spin_lock(&mp->m_sb_lock);
 321        sbf = mp->m_sb.sb_qflags;
 322        mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
 323        spin_unlock(&mp->m_sb_lock);
 324
 325        if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
 326                if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
 327                        /*
 328                         * We could only have been turning quotas off.
 329                         * We aren't in very good shape actually because
 330                         * the incore structures are convinced that quotas are
 331                         * off, but the on disk superblock doesn't know that !
 332                         */
 333                        ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
 334                        xfs_alert(mp, "%s: Superblock update failed!",
 335                                __func__);
 336                }
 337        }
 338
 339        if (error) {
 340                xfs_warn(mp, "Failed to initialize disk quotas.");
 341                return;
 342        }
 343}
 344
 345/*
 346 * Called from the vfsops layer.
 347 */
 348void
 349xfs_qm_unmount_quotas(
 350        xfs_mount_t     *mp)
 351{
 352        /*
 353         * Release the dquots that root inode, et al might be holding,
 354         * before we flush quotas and blow away the quotainfo structure.
 355         */
 356        ASSERT(mp->m_rootip);
 357        xfs_qm_dqdetach(mp->m_rootip);
 358        if (mp->m_rbmip)
 359                xfs_qm_dqdetach(mp->m_rbmip);
 360        if (mp->m_rsumip)
 361                xfs_qm_dqdetach(mp->m_rsumip);
 362
 363        /*
 364         * Release the quota inodes.
 365         */
 366        if (mp->m_quotainfo) {
 367                if (mp->m_quotainfo->qi_uquotaip) {
 368                        IRELE(mp->m_quotainfo->qi_uquotaip);
 369                        mp->m_quotainfo->qi_uquotaip = NULL;
 370                }
 371                if (mp->m_quotainfo->qi_gquotaip) {
 372                        IRELE(mp->m_quotainfo->qi_gquotaip);
 373                        mp->m_quotainfo->qi_gquotaip = NULL;
 374                }
 375                if (mp->m_quotainfo->qi_pquotaip) {
 376                        IRELE(mp->m_quotainfo->qi_pquotaip);
 377                        mp->m_quotainfo->qi_pquotaip = NULL;
 378                }
 379        }
 380}
 381
 382STATIC int
 383xfs_qm_dqattach_one(
 384        xfs_inode_t     *ip,
 385        xfs_dqid_t      id,
 386        uint            type,
 387        uint            doalloc,
 388        xfs_dquot_t     *udqhint, /* hint */
 389        xfs_dquot_t     **IO_idqpp)
 390{
 391        xfs_dquot_t     *dqp;
 392        int             error;
 393
 394        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 395        error = 0;
 396
 397        /*
 398         * See if we already have it in the inode itself. IO_idqpp is
 399         * &i_udquot or &i_gdquot. This made the code look weird, but
 400         * made the logic a lot simpler.
 401         */
 402        dqp = *IO_idqpp;
 403        if (dqp) {
 404                trace_xfs_dqattach_found(dqp);
 405                return 0;
 406        }
 407
 408        /*
 409         * udqhint is the i_udquot field in inode, and is non-NULL only
 410         * when the type arg is group/project. Its purpose is to save a
 411         * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
 412         * the user dquot.
 413         */
 414        if (udqhint) {
 415                ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 416                xfs_dqlock(udqhint);
 417
 418                /*
 419                 * No need to take dqlock to look at the id.
 420                 *
 421                 * The ID can't change until it gets reclaimed, and it won't
 422                 * be reclaimed as long as we have a ref from inode and we
 423                 * hold the ilock.
 424                 */
 425                if (type == XFS_DQ_GROUP)
 426                        dqp = udqhint->q_gdquot;
 427                else
 428                        dqp = udqhint->q_pdquot;
 429                if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
 430                        ASSERT(*IO_idqpp == NULL);
 431
 432                        *IO_idqpp = xfs_qm_dqhold(dqp);
 433                        xfs_dqunlock(udqhint);
 434                        return 0;
 435                }
 436
 437                /*
 438                 * We can't hold a dquot lock when we call the dqget code.
 439                 * We'll deadlock in no time, because of (not conforming to)
 440                 * lock ordering - the inodelock comes before any dquot lock,
 441                 * and we may drop and reacquire the ilock in xfs_qm_dqget().
 442                 */
 443                xfs_dqunlock(udqhint);
 444        }
 445
 446        /*
 447         * Find the dquot from somewhere. This bumps the
 448         * reference count of dquot and returns it locked.
 449         * This can return ENOENT if dquot didn't exist on
 450         * disk and we didn't ask it to allocate;
 451         * ESRCH if quotas got turned off suddenly.
 452         */
 453        error = xfs_qm_dqget(ip->i_mount, ip, id, type,
 454                             doalloc | XFS_QMOPT_DOWARN, &dqp);
 455        if (error)
 456                return error;
 457
 458        trace_xfs_dqattach_get(dqp);
 459
 460        /*
 461         * dqget may have dropped and re-acquired the ilock, but it guarantees
 462         * that the dquot returned is the one that should go in the inode.
 463         */
 464        *IO_idqpp = dqp;
 465        xfs_dqunlock(dqp);
 466        return 0;
 467}
 468
 469
 470/*
 471 * Given a udquot and group/project type, attach the group/project
 472 * dquot pointer to the udquot as a hint for future lookups.
 473 */
 474STATIC void
 475xfs_qm_dqattach_hint(
 476        struct xfs_inode        *ip,
 477        int                     type)
 478{
 479        struct xfs_dquot **dqhintp;
 480        struct xfs_dquot *dqp;
 481        struct xfs_dquot *udq = ip->i_udquot;
 482
 483        ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
 484
 485        xfs_dqlock(udq);
 486
 487        if (type == XFS_DQ_GROUP) {
 488                dqp = ip->i_gdquot;
 489                dqhintp = &udq->q_gdquot;
 490        } else {
 491                dqp = ip->i_pdquot;
 492                dqhintp = &udq->q_pdquot;
 493        }
 494
 495        if (*dqhintp) {
 496                struct xfs_dquot *tmp;
 497
 498                if (*dqhintp == dqp)
 499                        goto done;
 500
 501                tmp = *dqhintp;
 502                *dqhintp = NULL;
 503                xfs_qm_dqrele(tmp);
 504        }
 505
 506        *dqhintp = xfs_qm_dqhold(dqp);
 507done:
 508        xfs_dqunlock(udq);
 509}
 510
 511static bool
 512xfs_qm_need_dqattach(
 513        struct xfs_inode        *ip)
 514{
 515        struct xfs_mount        *mp = ip->i_mount;
 516
 517        if (!XFS_IS_QUOTA_RUNNING(mp))
 518                return false;
 519        if (!XFS_IS_QUOTA_ON(mp))
 520                return false;
 521        if (!XFS_NOT_DQATTACHED(mp, ip))
 522                return false;
 523        if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
 524                return false;
 525        return true;
 526}
 527
 528/*
 529 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
 530 * into account.
 531 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
 532 * Inode may get unlocked and relocked in here, and the caller must deal with
 533 * the consequences.
 534 */
 535int
 536xfs_qm_dqattach_locked(
 537        xfs_inode_t     *ip,
 538        uint            flags)
 539{
 540        xfs_mount_t     *mp = ip->i_mount;
 541        uint            nquotas = 0;
 542        int             error = 0;
 543
 544        if (!xfs_qm_need_dqattach(ip))
 545                return 0;
 546
 547        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 548
 549        if (XFS_IS_UQUOTA_ON(mp)) {
 550                error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
 551                                                flags & XFS_QMOPT_DQALLOC,
 552                                                NULL, &ip->i_udquot);
 553                if (error)
 554                        goto done;
 555                nquotas++;
 556        }
 557
 558        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 559        if (XFS_IS_GQUOTA_ON(mp)) {
 560                error = xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
 561                                                flags & XFS_QMOPT_DQALLOC,
 562                                                ip->i_udquot, &ip->i_gdquot);
 563                /*
 564                 * Don't worry about the udquot that we may have
 565                 * attached above. It'll get detached, if not already.
 566                 */
 567                if (error)
 568                        goto done;
 569                nquotas++;
 570        }
 571
 572        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 573        if (XFS_IS_PQUOTA_ON(mp)) {
 574                error = xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
 575                                                flags & XFS_QMOPT_DQALLOC,
 576                                                ip->i_udquot, &ip->i_pdquot);
 577                /*
 578                 * Don't worry about the udquot that we may have
 579                 * attached above. It'll get detached, if not already.
 580                 */
 581                if (error)
 582                        goto done;
 583                nquotas++;
 584        }
 585
 586        /*
 587         * Attach this group/project quota to the user quota as a hint.
 588         * This WON'T, in general, result in a thrash.
 589         */
 590        if (nquotas > 1 && ip->i_udquot) {
 591                ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 592                ASSERT(ip->i_gdquot || !XFS_IS_GQUOTA_ON(mp));
 593                ASSERT(ip->i_pdquot || !XFS_IS_PQUOTA_ON(mp));
 594
 595                /*
 596                 * We do not have i_udquot locked at this point, but this check
 597                 * is OK since we don't depend on the i_gdquot to be accurate
 598                 * 100% all the time. It is just a hint, and this will
 599                 * succeed in general.
 600                 */
 601                if (ip->i_udquot->q_gdquot != ip->i_gdquot)
 602                        xfs_qm_dqattach_hint(ip, XFS_DQ_GROUP);
 603
 604                if (ip->i_udquot->q_pdquot != ip->i_pdquot)
 605                        xfs_qm_dqattach_hint(ip, XFS_DQ_PROJ);
 606        }
 607
 608 done:
 609#ifdef DEBUG
 610        if (!error) {
 611                if (XFS_IS_UQUOTA_ON(mp))
 612                        ASSERT(ip->i_udquot);
 613                if (XFS_IS_GQUOTA_ON(mp))
 614                        ASSERT(ip->i_gdquot);
 615                if (XFS_IS_PQUOTA_ON(mp))
 616                        ASSERT(ip->i_pdquot);
 617        }
 618        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 619#endif
 620        return error;
 621}
 622
 623int
 624xfs_qm_dqattach(
 625        struct xfs_inode        *ip,
 626        uint                    flags)
 627{
 628        int                     error;
 629
 630        if (!xfs_qm_need_dqattach(ip))
 631                return 0;
 632
 633        xfs_ilock(ip, XFS_ILOCK_EXCL);
 634        error = xfs_qm_dqattach_locked(ip, flags);
 635        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 636
 637        return error;
 638}
 639
 640/*
 641 * Release dquots (and their references) if any.
 642 * The inode should be locked EXCL except when this's called by
 643 * xfs_ireclaim.
 644 */
 645void
 646xfs_qm_dqdetach(
 647        xfs_inode_t     *ip)
 648{
 649        if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
 650                return;
 651
 652        trace_xfs_dquot_dqdetach(ip);
 653
 654        ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
 655        if (ip->i_udquot) {
 656                xfs_qm_dqrele(ip->i_udquot);
 657                ip->i_udquot = NULL;
 658        }
 659        if (ip->i_gdquot) {
 660                xfs_qm_dqrele(ip->i_gdquot);
 661                ip->i_gdquot = NULL;
 662        }
 663        if (ip->i_pdquot) {
 664                xfs_qm_dqrele(ip->i_pdquot);
 665                ip->i_pdquot = NULL;
 666        }
 667}
 668
 669int
 670xfs_qm_calc_dquots_per_chunk(
 671        struct xfs_mount        *mp,
 672        unsigned int            nbblks) /* basic block units */
 673{
 674        unsigned int    ndquots;
 675
 676        ASSERT(nbblks > 0);
 677        ndquots = BBTOB(nbblks);
 678        do_div(ndquots, sizeof(xfs_dqblk_t));
 679
 680        return ndquots;
 681}
 682
 683/*
 684 * This initializes all the quota information that's kept in the
 685 * mount structure
 686 */
 687STATIC int
 688xfs_qm_init_quotainfo(
 689        xfs_mount_t     *mp)
 690{
 691        xfs_quotainfo_t *qinf;
 692        int             error;
 693        xfs_dquot_t     *dqp;
 694
 695        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 696
 697        qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
 698
 699        /*
 700         * See if quotainodes are setup, and if not, allocate them,
 701         * and change the superblock accordingly.
 702         */
 703        if ((error = xfs_qm_init_quotainos(mp))) {
 704                kmem_free(qinf);
 705                mp->m_quotainfo = NULL;
 706                return error;
 707        }
 708
 709        INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
 710        INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
 711        INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
 712        mutex_init(&qinf->qi_tree_lock);
 713
 714        INIT_LIST_HEAD(&qinf->qi_lru_list);
 715        qinf->qi_lru_count = 0;
 716        mutex_init(&qinf->qi_lru_lock);
 717
 718        /* mutex used to serialize quotaoffs */
 719        mutex_init(&qinf->qi_quotaofflock);
 720
 721        /* Precalc some constants */
 722        qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 723        qinf->qi_dqperchunk = xfs_qm_calc_dquots_per_chunk(mp,
 724                                                        qinf->qi_dqchunklen);
 725
 726        mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
 727
 728        /*
 729         * We try to get the limits from the superuser's limits fields.
 730         * This is quite hacky, but it is standard quota practice.
 731         *
 732         * We look at the USR dquot with id == 0 first, but if user quotas
 733         * are not enabled we goto the GRP dquot with id == 0.
 734         * We don't really care to keep separate default limits for user
 735         * and group quotas, at least not at this point.
 736         *
 737         * Since we may not have done a quotacheck by this point, just read
 738         * the dquot without attaching it to any hashtables or lists.
 739         */
 740        error = xfs_qm_dqread(mp, 0,
 741                        XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
 742                         (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
 743                          XFS_DQ_PROJ),
 744                        XFS_QMOPT_DOWARN, &dqp);
 745        if (!error) {
 746                xfs_disk_dquot_t        *ddqp = &dqp->q_core;
 747
 748                /*
 749                 * The warnings and timers set the grace period given to
 750                 * a user or group before he or she can not perform any
 751                 * more writing. If it is zero, a default is used.
 752                 */
 753                qinf->qi_btimelimit = ddqp->d_btimer ?
 754                        be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
 755                qinf->qi_itimelimit = ddqp->d_itimer ?
 756                        be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
 757                qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
 758                        be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
 759                qinf->qi_bwarnlimit = ddqp->d_bwarns ?
 760                        be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
 761                qinf->qi_iwarnlimit = ddqp->d_iwarns ?
 762                        be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
 763                qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
 764                        be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
 765                qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
 766                qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
 767                qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
 768                qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
 769                qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
 770                qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
 771 
 772                xfs_qm_dqdestroy(dqp);
 773        } else {
 774                qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
 775                qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
 776                qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
 777                qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
 778                qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
 779                qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
 780        }
 781
 782        qinf->qi_shrinker.shrink = xfs_qm_shake;
 783        qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 784        register_shrinker(&qinf->qi_shrinker);
 785        return 0;
 786}
 787
 788
 789/*
 790 * Gets called when unmounting a filesystem or when all quotas get
 791 * turned off.
 792 * This purges the quota inodes, destroys locks and frees itself.
 793 */
 794void
 795xfs_qm_destroy_quotainfo(
 796        xfs_mount_t     *mp)
 797{
 798        xfs_quotainfo_t *qi;
 799
 800        qi = mp->m_quotainfo;
 801        ASSERT(qi != NULL);
 802
 803        unregister_shrinker(&qi->qi_shrinker);
 804
 805        if (qi->qi_uquotaip) {
 806                IRELE(qi->qi_uquotaip);
 807                qi->qi_uquotaip = NULL; /* paranoia */
 808        }
 809        if (qi->qi_gquotaip) {
 810                IRELE(qi->qi_gquotaip);
 811                qi->qi_gquotaip = NULL;
 812        }
 813        if (qi->qi_pquotaip) {
 814                IRELE(qi->qi_pquotaip);
 815                qi->qi_pquotaip = NULL;
 816        }
 817        mutex_destroy(&qi->qi_quotaofflock);
 818        kmem_free(qi);
 819        mp->m_quotainfo = NULL;
 820}
 821
 822/*
 823 * Create an inode and return with a reference already taken, but unlocked
 824 * This is how we create quota inodes
 825 */
 826STATIC int
 827xfs_qm_qino_alloc(
 828        xfs_mount_t     *mp,
 829        xfs_inode_t     **ip,
 830        __int64_t       sbfields,
 831        uint            flags)
 832{
 833        xfs_trans_t     *tp;
 834        int             error;
 835        int             committed;
 836
 837        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
 838        if ((error = xfs_trans_reserve(tp,
 839                                      XFS_QM_QINOCREATE_SPACE_RES(mp),
 840                                      XFS_CREATE_LOG_RES(mp), 0,
 841                                      XFS_TRANS_PERM_LOG_RES,
 842                                      XFS_CREATE_LOG_COUNT))) {
 843                xfs_trans_cancel(tp, 0);
 844                return error;
 845        }
 846
 847        error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
 848        if (error) {
 849                xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 850                                 XFS_TRANS_ABORT);
 851                return error;
 852        }
 853
 854        /*
 855         * Make the changes in the superblock, and log those too.
 856         * sbfields arg may contain fields other than *QUOTINO;
 857         * VERSIONNUM for example.
 858         */
 859        spin_lock(&mp->m_sb_lock);
 860        if (flags & XFS_QMOPT_SBVERSION) {
 861                ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
 862                ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 863                                   XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
 864                       (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
 865                        XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 866
 867                xfs_sb_version_addquota(&mp->m_sb);
 868                mp->m_sb.sb_uquotino = NULLFSINO;
 869                mp->m_sb.sb_gquotino = NULLFSINO;
 870
 871                /* qflags will get updated _after_ quotacheck */
 872                mp->m_sb.sb_qflags = 0;
 873        }
 874        if (flags & XFS_QMOPT_UQUOTA)
 875                mp->m_sb.sb_uquotino = (*ip)->i_ino;
 876        else
 877                mp->m_sb.sb_gquotino = (*ip)->i_ino;
 878        spin_unlock(&mp->m_sb_lock);
 879        xfs_mod_sb(tp, sbfields);
 880
 881        if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
 882                xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 883                return error;
 884        }
 885        return 0;
 886}
 887
 888
 889STATIC void
 890xfs_qm_reset_dqcounts(
 891        xfs_mount_t     *mp,
 892        xfs_buf_t       *bp,
 893        xfs_dqid_t      id,
 894        uint            type)
 895{
 896        struct xfs_dqblk        *dqb;
 897        int                     j;
 898
 899        trace_xfs_reset_dqcounts(bp, _RET_IP_);
 900
 901        /*
 902         * Reset all counters and timers. They'll be
 903         * started afresh by xfs_qm_quotacheck.
 904         */
 905#ifdef DEBUG
 906        j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
 907        do_div(j, sizeof(xfs_dqblk_t));
 908        ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
 909#endif
 910        dqb = bp->b_addr;
 911        for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
 912                struct xfs_disk_dquot   *ddq;
 913
 914                ddq = (struct xfs_disk_dquot *)&dqb[j];
 915
 916                /*
 917                 * Do a sanity check, and if needed, repair the dqblk. Don't
 918                 * output any warnings because it's perfectly possible to
 919                 * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
 920                 */
 921                (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
 922                                      "xfs_quotacheck");
 923                ddq->d_bcount = 0;
 924                ddq->d_icount = 0;
 925                ddq->d_rtbcount = 0;
 926                ddq->d_btimer = 0;
 927                ddq->d_itimer = 0;
 928                ddq->d_rtbtimer = 0;
 929                ddq->d_bwarns = 0;
 930                ddq->d_iwarns = 0;
 931                ddq->d_rtbwarns = 0;
 932
 933                if (xfs_sb_version_hascrc(&mp->m_sb)) {
 934                        xfs_update_cksum((char *)&dqb[j],
 935                                         sizeof(struct xfs_dqblk),
 936                                         XFS_DQUOT_CRC_OFF);
 937                }
 938        }
 939}
 940
 941STATIC int
 942xfs_qm_dqiter_bufs(
 943        struct xfs_mount        *mp,
 944        xfs_dqid_t              firstid,
 945        xfs_fsblock_t           bno,
 946        xfs_filblks_t           blkcnt,
 947        uint                    flags,
 948        struct list_head        *buffer_list)
 949{
 950        struct xfs_buf          *bp;
 951        int                     error;
 952        int                     type;
 953
 954        ASSERT(blkcnt > 0);
 955        type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
 956                (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
 957        error = 0;
 958
 959        /*
 960         * Blkcnt arg can be a very big number, and might even be
 961         * larger than the log itself. So, we have to break it up into
 962         * manageable-sized transactions.
 963         * Note that we don't start a permanent transaction here; we might
 964         * not be able to get a log reservation for the whole thing up front,
 965         * and we don't really care to either, because we just discard
 966         * everything if we were to crash in the middle of this loop.
 967         */
 968        while (blkcnt--) {
 969                error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 970                              XFS_FSB_TO_DADDR(mp, bno),
 971                              mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 972                              &xfs_dquot_buf_ops);
 973
 974                /*
 975                 * CRC and validation errors will return a EFSCORRUPTED here. If
 976                 * this occurs, re-read without CRC validation so that we can
 977                 * repair the damage via xfs_qm_reset_dqcounts(). This process
 978                 * will leave a trace in the log indicating corruption has
 979                 * been detected.
 980                 */
 981                if (error == EFSCORRUPTED) {
 982                        error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
 983                                      XFS_FSB_TO_DADDR(mp, bno),
 984                                      mp->m_quotainfo->qi_dqchunklen, 0, &bp,
 985                                      NULL);
 986                }
 987
 988                if (error)
 989                        break;
 990
 991                xfs_qm_reset_dqcounts(mp, bp, firstid, type);
 992                xfs_buf_delwri_queue(bp, buffer_list);
 993                xfs_buf_relse(bp);
 994
 995                /* goto the next block. */
 996                bno++;
 997                firstid += mp->m_quotainfo->qi_dqperchunk;
 998        }
 999
1000        return error;
1001}
1002
1003/*
1004 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
1005 * caller supplied function for every chunk of dquots that we find.
1006 */
1007STATIC int
1008xfs_qm_dqiterate(
1009        struct xfs_mount        *mp,
1010        struct xfs_inode        *qip,
1011        uint                    flags,
1012        struct list_head        *buffer_list)
1013{
1014        struct xfs_bmbt_irec    *map;
1015        int                     i, nmaps;       /* number of map entries */
1016        int                     error;          /* return value */
1017        xfs_fileoff_t           lblkno;
1018        xfs_filblks_t           maxlblkcnt;
1019        xfs_dqid_t              firstid;
1020        xfs_fsblock_t           rablkno;
1021        xfs_filblks_t           rablkcnt;
1022
1023        error = 0;
1024        /*
1025         * This looks racy, but we can't keep an inode lock across a
1026         * trans_reserve. But, this gets called during quotacheck, and that
1027         * happens only at mount time which is single threaded.
1028         */
1029        if (qip->i_d.di_nblocks == 0)
1030                return 0;
1031
1032        map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
1033
1034        lblkno = 0;
1035        maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1036        do {
1037                nmaps = XFS_DQITER_MAP_SIZE;
1038                /*
1039                 * We aren't changing the inode itself. Just changing
1040                 * some of its data. No new blocks are added here, and
1041                 * the inode is never added to the transaction.
1042                 */
1043                xfs_ilock(qip, XFS_ILOCK_SHARED);
1044                error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
1045                                       map, &nmaps, 0);
1046                xfs_iunlock(qip, XFS_ILOCK_SHARED);
1047                if (error)
1048                        break;
1049
1050                ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1051                for (i = 0; i < nmaps; i++) {
1052                        ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1053                        ASSERT(map[i].br_blockcount);
1054
1055
1056                        lblkno += map[i].br_blockcount;
1057
1058                        if (map[i].br_startblock == HOLESTARTBLOCK)
1059                                continue;
1060
1061                        firstid = (xfs_dqid_t) map[i].br_startoff *
1062                                mp->m_quotainfo->qi_dqperchunk;
1063                        /*
1064                         * Do a read-ahead on the next extent.
1065                         */
1066                        if ((i+1 < nmaps) &&
1067                            (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1068                                rablkcnt =  map[i+1].br_blockcount;
1069                                rablkno = map[i+1].br_startblock;
1070                                while (rablkcnt--) {
1071                                        xfs_buf_readahead(mp->m_ddev_targp,
1072                                               XFS_FSB_TO_DADDR(mp, rablkno),
1073                                               mp->m_quotainfo->qi_dqchunklen,
1074                                               NULL);
1075                                        rablkno++;
1076                                }
1077                        }
1078                        /*
1079                         * Iterate thru all the blks in the extent and
1080                         * reset the counters of all the dquots inside them.
1081                         */
1082                        error = xfs_qm_dqiter_bufs(mp, firstid,
1083                                                   map[i].br_startblock,
1084                                                   map[i].br_blockcount,
1085                                                   flags, buffer_list);
1086                        if (error)
1087                                goto out;
1088                }
1089        } while (nmaps > 0);
1090
1091out:
1092        kmem_free(map);
1093        return error;
1094}
1095
1096/*
1097 * Called by dqusage_adjust in doing a quotacheck.
1098 *
1099 * Given the inode, and a dquot id this updates both the incore dqout as well
1100 * as the buffer copy. This is so that once the quotacheck is done, we can
1101 * just log all the buffers, as opposed to logging numerous updates to
1102 * individual dquots.
1103 */
1104STATIC int
1105xfs_qm_quotacheck_dqadjust(
1106        struct xfs_inode        *ip,
1107        xfs_dqid_t              id,
1108        uint                    type,
1109        xfs_qcnt_t              nblks,
1110        xfs_qcnt_t              rtblks)
1111{
1112        struct xfs_mount        *mp = ip->i_mount;
1113        struct xfs_dquot        *dqp;
1114        int                     error;
1115
1116        error = xfs_qm_dqget(mp, ip, id, type,
1117                             XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
1118        if (error) {
1119                /*
1120                 * Shouldn't be able to turn off quotas here.
1121                 */
1122                ASSERT(error != ESRCH);
1123                ASSERT(error != ENOENT);
1124                return error;
1125        }
1126
1127        trace_xfs_dqadjust(dqp);
1128
1129        /*
1130         * Adjust the inode count and the block count to reflect this inode's
1131         * resource usage.
1132         */
1133        be64_add_cpu(&dqp->q_core.d_icount, 1);
1134        dqp->q_res_icount++;
1135        if (nblks) {
1136                be64_add_cpu(&dqp->q_core.d_bcount, nblks);
1137                dqp->q_res_bcount += nblks;
1138        }
1139        if (rtblks) {
1140                be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
1141                dqp->q_res_rtbcount += rtblks;
1142        }
1143
1144        /*
1145         * Set default limits, adjust timers (since we changed usages)
1146         *
1147         * There are no timers for the default values set in the root dquot.
1148         */
1149        if (dqp->q_core.d_id) {
1150                xfs_qm_adjust_dqlimits(mp, dqp);
1151                xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
1152        }
1153
1154        dqp->dq_flags |= XFS_DQ_DIRTY;
1155        xfs_qm_dqput(dqp);
1156        return 0;
1157}
1158
1159STATIC int
1160xfs_qm_get_rtblks(
1161        xfs_inode_t     *ip,
1162        xfs_qcnt_t      *O_rtblks)
1163{
1164        xfs_filblks_t   rtblks;                 /* total rt blks */
1165        xfs_extnum_t    idx;                    /* extent record index */
1166        xfs_ifork_t     *ifp;                   /* inode fork pointer */
1167        xfs_extnum_t    nextents;               /* number of extent entries */
1168        int             error;
1169
1170        ASSERT(XFS_IS_REALTIME_INODE(ip));
1171        ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1172        if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1173                if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1174                        return error;
1175        }
1176        rtblks = 0;
1177        nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
1178        for (idx = 0; idx < nextents; idx++)
1179                rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
1180        *O_rtblks = (xfs_qcnt_t)rtblks;
1181        return 0;
1182}
1183
1184/*
1185 * callback routine supplied to bulkstat(). Given an inumber, find its
1186 * dquots and update them to account for resources taken by that inode.
1187 */
1188/* ARGSUSED */
1189STATIC int
1190xfs_qm_dqusage_adjust(
1191        xfs_mount_t     *mp,            /* mount point for filesystem */
1192        xfs_ino_t       ino,            /* inode number to get data for */
1193        void            __user *buffer, /* not used */
1194        int             ubsize,         /* not used */
1195        int             *ubused,        /* not used */
1196        int             *res)           /* result code value */
1197{
1198        xfs_inode_t     *ip;
1199        xfs_qcnt_t      nblks, rtblks = 0;
1200        int             error;
1201
1202        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1203
1204        /*
1205         * rootino must have its resources accounted for, not so with the quota
1206         * inodes.
1207         */
1208        if (xfs_is_quota_inode(&mp->m_sb, ino)) {
1209                *res = BULKSTAT_RV_NOTHING;
1210                return XFS_ERROR(EINVAL);
1211        }
1212
1213        /*
1214         * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1215         * interface expects the inode to be exclusively locked because that's
1216         * the case in all other instances. It's OK that we do this because
1217         * quotacheck is done only at mount time.
1218         */
1219        error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
1220        if (error) {
1221                *res = BULKSTAT_RV_NOTHING;
1222                return error;
1223        }
1224
1225        ASSERT(ip->i_delayed_blks == 0);
1226
1227        if (XFS_IS_REALTIME_INODE(ip)) {
1228                /*
1229                 * Walk thru the extent list and count the realtime blocks.
1230                 */
1231                error = xfs_qm_get_rtblks(ip, &rtblks);
1232                if (error)
1233                        goto error0;
1234        }
1235
1236        nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1237
1238        /*
1239         * Add the (disk blocks and inode) resources occupied by this
1240         * inode to its dquots. We do this adjustment in the incore dquot,
1241         * and also copy the changes to its buffer.
1242         * We don't care about putting these changes in a transaction
1243         * envelope because if we crash in the middle of a 'quotacheck'
1244         * we have to start from the beginning anyway.
1245         * Once we're done, we'll log all the dquot bufs.
1246         *
1247         * The *QUOTA_ON checks below may look pretty racy, but quotachecks
1248         * and quotaoffs don't race. (Quotachecks happen at mount time only).
1249         */
1250        if (XFS_IS_UQUOTA_ON(mp)) {
1251                error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
1252                                                   XFS_DQ_USER, nblks, rtblks);
1253                if (error)
1254                        goto error0;
1255        }
1256
1257        if (XFS_IS_GQUOTA_ON(mp)) {
1258                error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
1259                                                   XFS_DQ_GROUP, nblks, rtblks);
1260                if (error)
1261                        goto error0;
1262        }
1263
1264        if (XFS_IS_PQUOTA_ON(mp)) {
1265                error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
1266                                                   XFS_DQ_PROJ, nblks, rtblks);
1267                if (error)
1268                        goto error0;
1269        }
1270
1271        xfs_iunlock(ip, XFS_ILOCK_EXCL);
1272        IRELE(ip);
1273        *res = BULKSTAT_RV_DIDONE;
1274        return 0;
1275
1276error0:
1277        xfs_iunlock(ip, XFS_ILOCK_EXCL);
1278        IRELE(ip);
1279        *res = BULKSTAT_RV_GIVEUP;
1280        return error;
1281}
1282
1283STATIC int
1284xfs_qm_flush_one(
1285        struct xfs_dquot        *dqp,
1286        void                    *data)
1287{
1288        struct list_head        *buffer_list = data;
1289        struct xfs_buf          *bp = NULL;
1290        int                     error = 0;
1291
1292        xfs_dqlock(dqp);
1293        if (dqp->dq_flags & XFS_DQ_FREEING)
1294                goto out_unlock;
1295        if (!XFS_DQ_IS_DIRTY(dqp))
1296                goto out_unlock;
1297
1298        xfs_dqflock(dqp);
1299        error = xfs_qm_dqflush(dqp, &bp);
1300        if (error)
1301                goto out_unlock;
1302
1303        xfs_buf_delwri_queue(bp, buffer_list);
1304        xfs_buf_relse(bp);
1305out_unlock:
1306        xfs_dqunlock(dqp);
1307        return error;
1308}
1309
1310/*
1311 * Walk thru all the filesystem inodes and construct a consistent view
1312 * of the disk quota world. If the quotacheck fails, disable quotas.
1313 */
1314int
1315xfs_qm_quotacheck(
1316        xfs_mount_t     *mp)
1317{
1318        int                     done, count, error, error2;
1319        xfs_ino_t               lastino;
1320        size_t                  structsz;
1321        uint                    flags;
1322        LIST_HEAD               (buffer_list);
1323        struct xfs_inode        *uip = mp->m_quotainfo->qi_uquotaip;
1324        struct xfs_inode        *gip = mp->m_quotainfo->qi_gquotaip;
1325        struct xfs_inode        *pip = mp->m_quotainfo->qi_pquotaip;
1326
1327        count = INT_MAX;
1328        structsz = 1;
1329        lastino = 0;
1330        flags = 0;
1331
1332        ASSERT(uip || gip || pip);
1333        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1334
1335        xfs_notice(mp, "Quotacheck needed: Please wait.");
1336
1337        /*
1338         * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
1339         * their counters to zero. We need a clean slate.
1340         * We don't log our changes till later.
1341         */
1342        if (uip) {
1343                error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA,
1344                                         &buffer_list);
1345                if (error)
1346                        goto error_return;
1347                flags |= XFS_UQUOTA_CHKD;
1348        }
1349
1350        if (gip) {
1351                error = xfs_qm_dqiterate(mp, gip, XFS_QMOPT_GQUOTA,
1352                                         &buffer_list);
1353                if (error)
1354                        goto error_return;
1355                flags |= XFS_GQUOTA_CHKD;
1356        }
1357
1358        if (pip) {
1359                error = xfs_qm_dqiterate(mp, pip, XFS_QMOPT_PQUOTA,
1360                                         &buffer_list);
1361                if (error)
1362                        goto error_return;
1363                flags |= XFS_PQUOTA_CHKD;
1364        }
1365
1366        do {
1367                /*
1368                 * Iterate thru all the inodes in the file system,
1369                 * adjusting the corresponding dquot counters in core.
1370                 */
1371                error = xfs_bulkstat(mp, &lastino, &count,
1372                                     xfs_qm_dqusage_adjust,
1373                                     structsz, NULL, &done);
1374                if (error)
1375                        break;
1376
1377        } while (!done);
1378
1379        /*
1380         * We've made all the changes that we need to make incore.  Flush them
1381         * down to disk buffers if everything was updated successfully.
1382         */
1383        if (XFS_IS_UQUOTA_ON(mp)) {
1384                error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one,
1385                                          &buffer_list);
1386        }
1387        if (XFS_IS_GQUOTA_ON(mp)) {
1388                error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one,
1389                                           &buffer_list);
1390                if (!error)
1391                        error = error2;
1392        }
1393        if (XFS_IS_PQUOTA_ON(mp)) {
1394                error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one,
1395                                           &buffer_list);
1396                if (!error)
1397                        error = error2;
1398        }
1399
1400        error2 = xfs_buf_delwri_submit(&buffer_list);
1401        if (!error)
1402                error = error2;
1403
1404        /*
1405         * We can get this error if we couldn't do a dquot allocation inside
1406         * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1407         * dirty dquots that might be cached, we just want to get rid of them
1408         * and turn quotaoff. The dquots won't be attached to any of the inodes
1409         * at this point (because we intentionally didn't in dqget_noattach).
1410         */
1411        if (error) {
1412                xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
1413                goto error_return;
1414        }
1415
1416        /*
1417         * If one type of quotas is off, then it will lose its
1418         * quotachecked status, since we won't be doing accounting for
1419         * that type anymore.
1420         */
1421        mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
1422        mp->m_qflags |= flags;
1423
1424 error_return:
1425        while (!list_empty(&buffer_list)) {
1426                struct xfs_buf *bp =
1427                        list_first_entry(&buffer_list, struct xfs_buf, b_list);
1428                list_del_init(&bp->b_list);
1429                xfs_buf_relse(bp);
1430        }
1431
1432        if (error) {
1433                xfs_warn(mp,
1434        "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
1435                        error);
1436                /*
1437                 * We must turn off quotas.
1438                 */
1439                ASSERT(mp->m_quotainfo != NULL);
1440                xfs_qm_destroy_quotainfo(mp);
1441                if (xfs_mount_reset_sbqflags(mp)) {
1442                        xfs_warn(mp,
1443                                "Quotacheck: Failed to reset quota flags.");
1444                }
1445        } else
1446                xfs_notice(mp, "Quotacheck: Done.");
1447        return (error);
1448}
1449
1450/*
1451 * This is called after the superblock has been read in and we're ready to
1452 * iget the quota inodes.
1453 */
1454STATIC int
1455xfs_qm_init_quotainos(
1456        xfs_mount_t     *mp)
1457{
1458        struct xfs_inode        *uip = NULL;
1459        struct xfs_inode        *gip = NULL;
1460        struct xfs_inode        *pip = NULL;
1461        int                     error;
1462        __int64_t               sbflags = 0;
1463        uint                    flags = 0;
1464
1465        ASSERT(mp->m_quotainfo);
1466
1467        /*
1468         * Get the uquota and gquota inodes
1469         */
1470        if (xfs_sb_version_hasquota(&mp->m_sb)) {
1471                if (XFS_IS_UQUOTA_ON(mp) &&
1472                    mp->m_sb.sb_uquotino != NULLFSINO) {
1473                        ASSERT(mp->m_sb.sb_uquotino > 0);
1474                        error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1475                                             0, 0, &uip);
1476                        if (error)
1477                                return XFS_ERROR(error);
1478                }
1479                if (XFS_IS_GQUOTA_ON(mp) &&
1480                    mp->m_sb.sb_gquotino != NULLFSINO) {
1481                        ASSERT(mp->m_sb.sb_gquotino > 0);
1482                        error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1483                                             0, 0, &gip);
1484                        if (error)
1485                                goto error_rele;
1486                }
1487                /* XXX: Use gquotino for now */
1488                if (XFS_IS_PQUOTA_ON(mp) &&
1489                    mp->m_sb.sb_gquotino != NULLFSINO) {
1490                        ASSERT(mp->m_sb.sb_gquotino > 0);
1491                        error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
1492                                             0, 0, &pip);
1493                        if (error)
1494                                goto error_rele;
1495                }
1496        } else {
1497                flags |= XFS_QMOPT_SBVERSION;
1498                sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1499                            XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
1500        }
1501
1502        /*
1503         * Create the three inodes, if they don't exist already. The changes
1504         * made above will get added to a transaction and logged in one of
1505         * the qino_alloc calls below.  If the device is readonly,
1506         * temporarily switch to read-write to do this.
1507         */
1508        if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
1509                error = xfs_qm_qino_alloc(mp, &uip,
1510                                              sbflags | XFS_SB_UQUOTINO,
1511                                              flags | XFS_QMOPT_UQUOTA);
1512                if (error)
1513                        goto error_rele;
1514
1515                flags &= ~XFS_QMOPT_SBVERSION;
1516        }
1517        if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
1518                error = xfs_qm_qino_alloc(mp, &gip,
1519                                          sbflags | XFS_SB_GQUOTINO,
1520                                          flags | XFS_QMOPT_GQUOTA);
1521                if (error)
1522                        goto error_rele;
1523
1524                flags &= ~XFS_QMOPT_SBVERSION;
1525        }
1526        if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
1527                /* XXX: Use XFS_SB_GQUOTINO for now */
1528                error = xfs_qm_qino_alloc(mp, &pip,
1529                                          sbflags | XFS_SB_GQUOTINO,
1530                                          flags | XFS_QMOPT_PQUOTA);
1531                if (error)
1532                        goto error_rele;
1533        }
1534
1535        mp->m_quotainfo->qi_uquotaip = uip;
1536        mp->m_quotainfo->qi_gquotaip = gip;
1537        mp->m_quotainfo->qi_pquotaip = pip;
1538
1539        return 0;
1540
1541error_rele:
1542        if (uip)
1543                IRELE(uip);
1544        if (gip)
1545                IRELE(gip);
1546        if (pip)
1547                IRELE(pip);
1548        return XFS_ERROR(error);
1549}
1550
1551STATIC void
1552xfs_qm_dqfree_one(
1553        struct xfs_dquot        *dqp)
1554{
1555        struct xfs_mount        *mp = dqp->q_mount;
1556        struct xfs_quotainfo    *qi = mp->m_quotainfo;
1557
1558        mutex_lock(&qi->qi_tree_lock);
1559        radix_tree_delete(xfs_dquot_tree(qi, dqp->q_core.d_flags),
1560                          be32_to_cpu(dqp->q_core.d_id));
1561
1562        qi->qi_dquots--;
1563        mutex_unlock(&qi->qi_tree_lock);
1564
1565        xfs_qm_dqdestroy(dqp);
1566}
1567
1568STATIC void
1569xfs_qm_dqreclaim_one(
1570        struct xfs_dquot        *dqp,
1571        struct list_head        *buffer_list,
1572        struct list_head        *dispose_list)
1573{
1574        struct xfs_mount        *mp = dqp->q_mount;
1575        struct xfs_quotainfo    *qi = mp->m_quotainfo;
1576        int                     error;
1577
1578        if (!xfs_dqlock_nowait(dqp))
1579                goto out_move_tail;
1580
1581        /*
1582         * This dquot has acquired a reference in the meantime remove it from
1583         * the freelist and try again.
1584         */
1585        if (dqp->q_nrefs) {
1586                xfs_dqunlock(dqp);
1587
1588                trace_xfs_dqreclaim_want(dqp);
1589                XFS_STATS_INC(xs_qm_dqwants);
1590
1591                list_del_init(&dqp->q_lru);
1592                qi->qi_lru_count--;
1593                XFS_STATS_DEC(xs_qm_dquot_unused);
1594                return;
1595        }
1596
1597        /*
1598         * Try to grab the flush lock. If this dquot is in the process of
1599         * getting flushed to disk, we don't want to reclaim it.
1600         */
1601        if (!xfs_dqflock_nowait(dqp))
1602                goto out_unlock_move_tail;
1603
1604        if (XFS_DQ_IS_DIRTY(dqp)) {
1605                struct xfs_buf  *bp = NULL;
1606
1607                trace_xfs_dqreclaim_dirty(dqp);
1608
1609                error = xfs_qm_dqflush(dqp, &bp);
1610                if (error) {
1611                        xfs_warn(mp, "%s: dquot %p flush failed",
1612                                 __func__, dqp);
1613                        goto out_unlock_move_tail;
1614                }
1615
1616                xfs_buf_delwri_queue(bp, buffer_list);
1617                xfs_buf_relse(bp);
1618                /*
1619                 * Give the dquot another try on the freelist, as the
1620                 * flushing will take some time.
1621                 */
1622                goto out_unlock_move_tail;
1623        }
1624        xfs_dqfunlock(dqp);
1625
1626        /*
1627         * Prevent lookups now that we are past the point of no return.
1628         */
1629        dqp->dq_flags |= XFS_DQ_FREEING;
1630        xfs_dqunlock(dqp);
1631
1632        ASSERT(dqp->q_nrefs == 0);
1633        list_move_tail(&dqp->q_lru, dispose_list);
1634        qi->qi_lru_count--;
1635        XFS_STATS_DEC(xs_qm_dquot_unused);
1636
1637        trace_xfs_dqreclaim_done(dqp);
1638        XFS_STATS_INC(xs_qm_dqreclaims);
1639        return;
1640
1641        /*
1642         * Move the dquot to the tail of the list so that we don't spin on it.
1643         */
1644out_unlock_move_tail:
1645        xfs_dqunlock(dqp);
1646out_move_tail:
1647        list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
1648        trace_xfs_dqreclaim_busy(dqp);
1649        XFS_STATS_INC(xs_qm_dqreclaim_misses);
1650}
1651
1652STATIC int
1653xfs_qm_shake(
1654        struct shrinker         *shrink,
1655        struct shrink_control   *sc)
1656{
1657        struct xfs_quotainfo    *qi =
1658                container_of(shrink, struct xfs_quotainfo, qi_shrinker);
1659        int                     nr_to_scan = sc->nr_to_scan;
1660        LIST_HEAD               (buffer_list);
1661        LIST_HEAD               (dispose_list);
1662        struct xfs_dquot        *dqp;
1663        int                     error;
1664
1665        if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
1666                return 0;
1667        if (!nr_to_scan)
1668                goto out;
1669
1670        mutex_lock(&qi->qi_lru_lock);
1671        while (!list_empty(&qi->qi_lru_list)) {
1672                if (nr_to_scan-- <= 0)
1673                        break;
1674                dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
1675                                       q_lru);
1676                xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list);
1677        }
1678        mutex_unlock(&qi->qi_lru_lock);
1679
1680        error = xfs_buf_delwri_submit(&buffer_list);
1681        if (error)
1682                xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
1683
1684        while (!list_empty(&dispose_list)) {
1685                dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
1686                list_del_init(&dqp->q_lru);
1687                xfs_qm_dqfree_one(dqp);
1688        }
1689
1690out:
1691        return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
1692}
1693
1694/*
1695 * Start a transaction and write the incore superblock changes to
1696 * disk. flags parameter indicates which fields have changed.
1697 */
1698int
1699xfs_qm_write_sb_changes(
1700        xfs_mount_t     *mp,
1701        __int64_t       flags)
1702{
1703        xfs_trans_t     *tp;
1704        int             error;
1705
1706        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
1707        error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
1708                                  0, 0, XFS_DEFAULT_LOG_COUNT);
1709        if (error) {
1710                xfs_trans_cancel(tp, 0);
1711                return error;
1712        }
1713
1714        xfs_mod_sb(tp, flags);
1715        error = xfs_trans_commit(tp, 0);
1716
1717        return error;
1718}
1719
1720
1721/* --------------- utility functions for vnodeops ---------------- */
1722
1723
1724/*
1725 * Given an inode, a uid, gid and prid make sure that we have
1726 * allocated relevant dquot(s) on disk, and that we won't exceed inode
1727 * quotas by creating this file.
1728 * This also attaches dquot(s) to the given inode after locking it,
1729 * and returns the dquots corresponding to the uid and/or gid.
1730 *
1731 * in   : inode (unlocked)
1732 * out  : udquot, gdquot with references taken and unlocked
1733 */
1734int
1735xfs_qm_vop_dqalloc(
1736        struct xfs_inode        *ip,
1737        uid_t                   uid,
1738        gid_t                   gid,
1739        prid_t                  prid,
1740        uint                    flags,
1741        struct xfs_dquot        **O_udqpp,
1742        struct xfs_dquot        **O_gdqpp,
1743        struct xfs_dquot        **O_pdqpp)
1744{
1745        struct xfs_mount        *mp = ip->i_mount;
1746        struct xfs_dquot        *uq = NULL;
1747        struct xfs_dquot        *gq = NULL;
1748        struct xfs_dquot        *pq = NULL;
1749        int                     error;
1750        uint                    lockflags;
1751
1752        if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
1753                return 0;
1754
1755        lockflags = XFS_ILOCK_EXCL;
1756        xfs_ilock(ip, lockflags);
1757
1758        if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
1759                gid = ip->i_d.di_gid;
1760
1761        /*
1762         * Attach the dquot(s) to this inode, doing a dquot allocation
1763         * if necessary. The dquot(s) will not be locked.
1764         */
1765        if (XFS_NOT_DQATTACHED(mp, ip)) {
1766                error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
1767                if (error) {
1768                        xfs_iunlock(ip, lockflags);
1769                        return error;
1770                }
1771        }
1772
1773        if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
1774                if (ip->i_d.di_uid != uid) {
1775                        /*
1776                         * What we need is the dquot that has this uid, and
1777                         * if we send the inode to dqget, the uid of the inode
1778                         * takes priority over what's sent in the uid argument.
1779                         * We must unlock inode here before calling dqget if
1780                         * we're not sending the inode, because otherwise
1781                         * we'll deadlock by doing trans_reserve while
1782                         * holding ilock.
1783                         */
1784                        xfs_iunlock(ip, lockflags);
1785                        error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
1786                                                 XFS_DQ_USER,
1787                                                 XFS_QMOPT_DQALLOC |
1788                                                 XFS_QMOPT_DOWARN,
1789                                                 &uq);
1790                        if (error) {
1791                                ASSERT(error != ENOENT);
1792                                return error;
1793                        }
1794                        /*
1795                         * Get the ilock in the right order.
1796                         */
1797                        xfs_dqunlock(uq);
1798                        lockflags = XFS_ILOCK_SHARED;
1799                        xfs_ilock(ip, lockflags);
1800                } else {
1801                        /*
1802                         * Take an extra reference, because we'll return
1803                         * this to caller
1804                         */
1805                        ASSERT(ip->i_udquot);
1806                        uq = xfs_qm_dqhold(ip->i_udquot);
1807                }
1808        }
1809        if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
1810                if (ip->i_d.di_gid != gid) {
1811                        xfs_iunlock(ip, lockflags);
1812                        error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
1813                                                 XFS_DQ_GROUP,
1814                                                 XFS_QMOPT_DQALLOC |
1815                                                 XFS_QMOPT_DOWARN,
1816                                                 &gq);
1817                        if (error) {
1818                                ASSERT(error != ENOENT);
1819                                goto error_rele;
1820                        }
1821                        xfs_dqunlock(gq);
1822                        lockflags = XFS_ILOCK_SHARED;
1823                        xfs_ilock(ip, lockflags);
1824                } else {
1825                        ASSERT(ip->i_gdquot);
1826                        gq = xfs_qm_dqhold(ip->i_gdquot);
1827                }
1828        }
1829        if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
1830                if (xfs_get_projid(ip) != prid) {
1831                        xfs_iunlock(ip, lockflags);
1832                        error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
1833                                                 XFS_DQ_PROJ,
1834                                                 XFS_QMOPT_DQALLOC |
1835                                                 XFS_QMOPT_DOWARN,
1836                                                 &pq);
1837                        if (error) {
1838                                ASSERT(error != ENOENT);
1839                                goto error_rele;
1840                        }
1841                        xfs_dqunlock(pq);
1842                        lockflags = XFS_ILOCK_SHARED;
1843                        xfs_ilock(ip, lockflags);
1844                } else {
1845                        ASSERT(ip->i_pdquot);
1846                        pq = xfs_qm_dqhold(ip->i_pdquot);
1847                }
1848        }
1849        if (uq)
1850                trace_xfs_dquot_dqalloc(ip);
1851
1852        xfs_iunlock(ip, lockflags);
1853        if (O_udqpp)
1854                *O_udqpp = uq;
1855        else if (uq)
1856                xfs_qm_dqrele(uq);
1857        if (O_gdqpp)
1858                *O_gdqpp = gq;
1859        else if (gq)
1860                xfs_qm_dqrele(gq);
1861        if (O_pdqpp)
1862                *O_pdqpp = pq;
1863        else if (pq)
1864                xfs_qm_dqrele(pq);
1865        return 0;
1866
1867error_rele:
1868        if (gq)
1869                xfs_qm_dqrele(gq);
1870        if (uq)
1871                xfs_qm_dqrele(uq);
1872        return error;
1873}
1874
1875/*
1876 * Actually transfer ownership, and do dquot modifications.
1877 * These were already reserved.
1878 */
1879xfs_dquot_t *
1880xfs_qm_vop_chown(
1881        xfs_trans_t     *tp,
1882        xfs_inode_t     *ip,
1883        xfs_dquot_t     **IO_olddq,
1884        xfs_dquot_t     *newdq)
1885{
1886        xfs_dquot_t     *prevdq;
1887        uint            bfield = XFS_IS_REALTIME_INODE(ip) ?
1888                                 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
1889
1890
1891        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1892        ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
1893
1894        /* old dquot */
1895        prevdq = *IO_olddq;
1896        ASSERT(prevdq);
1897        ASSERT(prevdq != newdq);
1898
1899        xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
1900        xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
1901
1902        /* the sparkling new dquot */
1903        xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
1904        xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
1905
1906        /*
1907         * Take an extra reference, because the inode is going to keep
1908         * this dquot pointer even after the trans_commit.
1909         */
1910        *IO_olddq = xfs_qm_dqhold(newdq);
1911
1912        return prevdq;
1913}
1914
1915/*
1916 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
1917 */
1918int
1919xfs_qm_vop_chown_reserve(
1920        struct xfs_trans        *tp,
1921        struct xfs_inode        *ip,
1922        struct xfs_dquot        *udqp,
1923        struct xfs_dquot        *gdqp,
1924        struct xfs_dquot        *pdqp,
1925        uint                    flags)
1926{
1927        struct xfs_mount        *mp = ip->i_mount;
1928        uint                    delblks, blkflags, prjflags = 0;
1929        struct xfs_dquot        *udq_unres = NULL;
1930        struct xfs_dquot        *gdq_unres = NULL;
1931        struct xfs_dquot        *pdq_unres = NULL;
1932        struct xfs_dquot        *udq_delblks = NULL;
1933        struct xfs_dquot        *gdq_delblks = NULL;
1934        struct xfs_dquot        *pdq_delblks = NULL;
1935        int                     error;
1936
1937
1938        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
1939        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1940
1941        delblks = ip->i_delayed_blks;
1942        blkflags = XFS_IS_REALTIME_INODE(ip) ?
1943                        XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
1944
1945        if (XFS_IS_UQUOTA_ON(mp) && udqp &&
1946            ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
1947                udq_delblks = udqp;
1948                /*
1949                 * If there are delayed allocation blocks, then we have to
1950                 * unreserve those from the old dquot, and add them to the
1951                 * new dquot.
1952                 */
1953                if (delblks) {
1954                        ASSERT(ip->i_udquot);
1955                        udq_unres = ip->i_udquot;
1956                }
1957        }
1958        if (XFS_IS_GQUOTA_ON(ip->i_mount) && gdqp &&
1959            ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) {
1960                gdq_delblks = gdqp;
1961                if (delblks) {
1962                        ASSERT(ip->i_gdquot);
1963                        gdq_unres = ip->i_gdquot;
1964                }
1965        }
1966
1967        if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
1968            xfs_get_projid(ip) != be32_to_cpu(pdqp->q_core.d_id)) {
1969                prjflags = XFS_QMOPT_ENOSPC;
1970                pdq_delblks = pdqp;
1971                if (delblks) {
1972                        ASSERT(ip->i_pdquot);
1973                        pdq_unres = ip->i_pdquot;
1974                }
1975        }
1976
1977        error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
1978                                udq_delblks, gdq_delblks, pdq_delblks,
1979                                ip->i_d.di_nblocks, 1,
1980                                flags | blkflags | prjflags);
1981        if (error)
1982                return error;
1983
1984        /*
1985         * Do the delayed blks reservations/unreservations now. Since, these
1986         * are done without the help of a transaction, if a reservation fails
1987         * its previous reservations won't be automatically undone by trans
1988         * code. So, we have to do it manually here.
1989         */
1990        if (delblks) {
1991                /*
1992                 * Do the reservations first. Unreservation can't fail.
1993                 */
1994                ASSERT(udq_delblks || gdq_delblks || pdq_delblks);
1995                ASSERT(udq_unres || gdq_unres || pdq_unres);
1996                error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
1997                            udq_delblks, gdq_delblks, pdq_delblks,
1998                            (xfs_qcnt_t)delblks, 0,
1999                            flags | blkflags | prjflags);
2000                if (error)
2001                        return error;
2002                xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2003                                udq_unres, gdq_unres, pdq_unres,
2004                                -((xfs_qcnt_t)delblks), 0, blkflags);
2005        }
2006
2007        return (0);
2008}
2009
2010int
2011xfs_qm_vop_rename_dqattach(
2012        struct xfs_inode        **i_tab)
2013{
2014        struct xfs_mount        *mp = i_tab[0]->i_mount;
2015        int                     i;
2016
2017        if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2018                return 0;
2019
2020        for (i = 0; (i < 4 && i_tab[i]); i++) {
2021                struct xfs_inode        *ip = i_tab[i];
2022                int                     error;
2023
2024                /*
2025                 * Watch out for duplicate entries in the table.
2026                 */
2027                if (i == 0 || ip != i_tab[i-1]) {
2028                        if (XFS_NOT_DQATTACHED(mp, ip)) {
2029                                error = xfs_qm_dqattach(ip, 0);
2030                                if (error)
2031                                        return error;
2032                        }
2033                }
2034        }
2035        return 0;
2036}
2037
2038void
2039xfs_qm_vop_create_dqattach(
2040        struct xfs_trans        *tp,
2041        struct xfs_inode        *ip,
2042        struct xfs_dquot        *udqp,
2043        struct xfs_dquot        *gdqp,
2044        struct xfs_dquot        *pdqp)
2045{
2046        struct xfs_mount        *mp = tp->t_mountp;
2047
2048        if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
2049                return;
2050
2051        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
2052        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2053
2054        if (udqp) {
2055                ASSERT(ip->i_udquot == NULL);
2056                ASSERT(XFS_IS_UQUOTA_ON(mp));
2057                ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
2058
2059                ip->i_udquot = xfs_qm_dqhold(udqp);
2060                xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
2061        }
2062        if (gdqp) {
2063                ASSERT(ip->i_gdquot == NULL);
2064                ASSERT(XFS_IS_GQUOTA_ON(mp));
2065                ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
2066                ip->i_gdquot = xfs_qm_dqhold(gdqp);
2067                xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
2068        }
2069        if (pdqp) {
2070                ASSERT(ip->i_pdquot == NULL);
2071                ASSERT(XFS_IS_PQUOTA_ON(mp));
2072                ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
2073
2074                ip->i_pdquot = xfs_qm_dqhold(pdqp);
2075                xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
2076        }
2077}
2078
2079
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