linux/fs/xfs/xfs_qm_syscalls.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
  19#include <linux/capability.h>
  20
  21#include "xfs.h"
  22#include "xfs_fs.h"
  23#include "xfs_bit.h"
  24#include "xfs_log.h"
  25#include "xfs_trans.h"
  26#include "xfs_sb.h"
  27#include "xfs_ag.h"
  28#include "xfs_alloc.h"
  29#include "xfs_quota.h"
  30#include "xfs_mount.h"
  31#include "xfs_bmap_btree.h"
  32#include "xfs_inode.h"
  33#include "xfs_inode_item.h"
  34#include "xfs_itable.h"
  35#include "xfs_bmap.h"
  36#include "xfs_rtalloc.h"
  37#include "xfs_error.h"
  38#include "xfs_attr.h"
  39#include "xfs_buf_item.h"
  40#include "xfs_utils.h"
  41#include "xfs_qm.h"
  42#include "xfs_trace.h"
  43
  44STATIC int      xfs_qm_log_quotaoff(xfs_mount_t *, xfs_qoff_logitem_t **, uint);
  45STATIC int      xfs_qm_log_quotaoff_end(xfs_mount_t *, xfs_qoff_logitem_t *,
  46                                        uint);
  47STATIC uint     xfs_qm_export_flags(uint);
  48STATIC uint     xfs_qm_export_qtype_flags(uint);
  49
  50/*
  51 * Turn off quota accounting and/or enforcement for all udquots and/or
  52 * gdquots. Called only at unmount time.
  53 *
  54 * This assumes that there are no dquots of this file system cached
  55 * incore, and modifies the ondisk dquot directly. Therefore, for example,
  56 * it is an error to call this twice, without purging the cache.
  57 */
  58int
  59xfs_qm_scall_quotaoff(
  60        xfs_mount_t             *mp,
  61        uint                    flags)
  62{
  63        struct xfs_quotainfo    *q = mp->m_quotainfo;
  64        uint                    dqtype;
  65        int                     error;
  66        uint                    inactivate_flags;
  67        xfs_qoff_logitem_t      *qoffstart;
  68
  69        /*
  70         * No file system can have quotas enabled on disk but not in core.
  71         * Note that quota utilities (like quotaoff) _expect_
  72         * errno == EEXIST here.
  73         */
  74        if ((mp->m_qflags & flags) == 0)
  75                return XFS_ERROR(EEXIST);
  76        error = 0;
  77
  78        flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
  79
  80        /*
  81         * We don't want to deal with two quotaoffs messing up each other,
  82         * so we're going to serialize it. quotaoff isn't exactly a performance
  83         * critical thing.
  84         * If quotaoff, then we must be dealing with the root filesystem.
  85         */
  86        ASSERT(q);
  87        mutex_lock(&q->qi_quotaofflock);
  88
  89        /*
  90         * If we're just turning off quota enforcement, change mp and go.
  91         */
  92        if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
  93                mp->m_qflags &= ~(flags);
  94
  95                spin_lock(&mp->m_sb_lock);
  96                mp->m_sb.sb_qflags = mp->m_qflags;
  97                spin_unlock(&mp->m_sb_lock);
  98                mutex_unlock(&q->qi_quotaofflock);
  99
 100                /* XXX what to do if error ? Revert back to old vals incore ? */
 101                error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
 102                return (error);
 103        }
 104
 105        dqtype = 0;
 106        inactivate_flags = 0;
 107        /*
 108         * If accounting is off, we must turn enforcement off, clear the
 109         * quota 'CHKD' certificate to make it known that we have to
 110         * do a quotacheck the next time this quota is turned on.
 111         */
 112        if (flags & XFS_UQUOTA_ACCT) {
 113                dqtype |= XFS_QMOPT_UQUOTA;
 114                flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
 115                inactivate_flags |= XFS_UQUOTA_ACTIVE;
 116        }
 117        if (flags & XFS_GQUOTA_ACCT) {
 118                dqtype |= XFS_QMOPT_GQUOTA;
 119                flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
 120                inactivate_flags |= XFS_GQUOTA_ACTIVE;
 121        } else if (flags & XFS_PQUOTA_ACCT) {
 122                dqtype |= XFS_QMOPT_PQUOTA;
 123                flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
 124                inactivate_flags |= XFS_PQUOTA_ACTIVE;
 125        }
 126
 127        /*
 128         * Nothing to do?  Don't complain. This happens when we're just
 129         * turning off quota enforcement.
 130         */
 131        if ((mp->m_qflags & flags) == 0)
 132                goto out_unlock;
 133
 134        /*
 135         * Write the LI_QUOTAOFF log record, and do SB changes atomically,
 136         * and synchronously. If we fail to write, we should abort the
 137         * operation as it cannot be recovered safely if we crash.
 138         */
 139        error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
 140        if (error)
 141                goto out_unlock;
 142
 143        /*
 144         * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
 145         * to take care of the race between dqget and quotaoff. We don't take
 146         * any special locks to reset these bits. All processes need to check
 147         * these bits *after* taking inode lock(s) to see if the particular
 148         * quota type is in the process of being turned off. If *ACTIVE, it is
 149         * guaranteed that all dquot structures and all quotainode ptrs will all
 150         * stay valid as long as that inode is kept locked.
 151         *
 152         * There is no turning back after this.
 153         */
 154        mp->m_qflags &= ~inactivate_flags;
 155
 156        /*
 157         * Give back all the dquot reference(s) held by inodes.
 158         * Here we go thru every single incore inode in this file system, and
 159         * do a dqrele on the i_udquot/i_gdquot that it may have.
 160         * Essentially, as long as somebody has an inode locked, this guarantees
 161         * that quotas will not be turned off. This is handy because in a
 162         * transaction once we lock the inode(s) and check for quotaon, we can
 163         * depend on the quota inodes (and other things) being valid as long as
 164         * we keep the lock(s).
 165         */
 166        xfs_qm_dqrele_all_inodes(mp, flags);
 167
 168        /*
 169         * Next we make the changes in the quota flag in the mount struct.
 170         * This isn't protected by a particular lock directly, because we
 171         * don't want to take a mrlock every time we depend on quotas being on.
 172         */
 173        mp->m_qflags &= ~flags;
 174
 175        /*
 176         * Go through all the dquots of this file system and purge them,
 177         * according to what was turned off.
 178         */
 179        xfs_qm_dqpurge_all(mp, dqtype);
 180
 181        /*
 182         * Transactions that had started before ACTIVE state bit was cleared
 183         * could have logged many dquots, so they'd have higher LSNs than
 184         * the first QUOTAOFF log record does. If we happen to crash when
 185         * the tail of the log has gone past the QUOTAOFF record, but
 186         * before the last dquot modification, those dquots __will__
 187         * recover, and that's not good.
 188         *
 189         * So, we have QUOTAOFF start and end logitems; the start
 190         * logitem won't get overwritten until the end logitem appears...
 191         */
 192        error = xfs_qm_log_quotaoff_end(mp, qoffstart, flags);
 193        if (error) {
 194                /* We're screwed now. Shutdown is the only option. */
 195                xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 196                goto out_unlock;
 197        }
 198
 199        /*
 200         * If quotas is completely disabled, close shop.
 201         */
 202        if (((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET1) ||
 203            ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET2)) {
 204                mutex_unlock(&q->qi_quotaofflock);
 205                xfs_qm_destroy_quotainfo(mp);
 206                return (0);
 207        }
 208
 209        /*
 210         * Release our quotainode references if we don't need them anymore.
 211         */
 212        if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
 213                IRELE(q->qi_uquotaip);
 214                q->qi_uquotaip = NULL;
 215        }
 216        if ((dqtype & (XFS_QMOPT_GQUOTA|XFS_QMOPT_PQUOTA)) && q->qi_gquotaip) {
 217                IRELE(q->qi_gquotaip);
 218                q->qi_gquotaip = NULL;
 219        }
 220
 221out_unlock:
 222        mutex_unlock(&q->qi_quotaofflock);
 223        return error;
 224}
 225
 226STATIC int
 227xfs_qm_scall_trunc_qfile(
 228        struct xfs_mount        *mp,
 229        xfs_ino_t               ino)
 230{
 231        struct xfs_inode        *ip;
 232        struct xfs_trans        *tp;
 233        int                     error;
 234
 235        if (ino == NULLFSINO)
 236                return 0;
 237
 238        error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
 239        if (error)
 240                return error;
 241
 242        xfs_ilock(ip, XFS_IOLOCK_EXCL);
 243
 244        tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
 245        error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
 246                                  XFS_TRANS_PERM_LOG_RES,
 247                                  XFS_ITRUNCATE_LOG_COUNT);
 248        if (error) {
 249                xfs_trans_cancel(tp, 0);
 250                xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 251                goto out_put;
 252        }
 253
 254        xfs_ilock(ip, XFS_ILOCK_EXCL);
 255        xfs_trans_ijoin(tp, ip, 0);
 256
 257        ip->i_d.di_size = 0;
 258        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 259
 260        error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
 261        if (error) {
 262                xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 263                                     XFS_TRANS_ABORT);
 264                goto out_unlock;
 265        }
 266
 267        ASSERT(ip->i_d.di_nextents == 0);
 268
 269        xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 270        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 271
 272out_unlock:
 273        xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
 274out_put:
 275        IRELE(ip);
 276        return error;
 277}
 278
 279int
 280xfs_qm_scall_trunc_qfiles(
 281        xfs_mount_t     *mp,
 282        uint            flags)
 283{
 284        int             error = 0, error2 = 0;
 285
 286        if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {
 287                xfs_debug(mp, "%s: flags=%x m_qflags=%x\n",
 288                        __func__, flags, mp->m_qflags);
 289                return XFS_ERROR(EINVAL);
 290        }
 291
 292        if (flags & XFS_DQ_USER)
 293                error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
 294        if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
 295                error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
 296
 297        return error ? error : error2;
 298}
 299
 300/*
 301 * Switch on (a given) quota enforcement for a filesystem.  This takes
 302 * effect immediately.
 303 * (Switching on quota accounting must be done at mount time.)
 304 */
 305int
 306xfs_qm_scall_quotaon(
 307        xfs_mount_t     *mp,
 308        uint            flags)
 309{
 310        int             error;
 311        uint            qf;
 312        __int64_t       sbflags;
 313
 314        flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
 315        /*
 316         * Switching on quota accounting must be done at mount time.
 317         */
 318        flags &= ~(XFS_ALL_QUOTA_ACCT);
 319
 320        sbflags = 0;
 321
 322        if (flags == 0) {
 323                xfs_debug(mp, "%s: zero flags, m_qflags=%x\n",
 324                        __func__, mp->m_qflags);
 325                return XFS_ERROR(EINVAL);
 326        }
 327
 328        /* No fs can turn on quotas with a delayed effect */
 329        ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
 330
 331        /*
 332         * Can't enforce without accounting. We check the superblock
 333         * qflags here instead of m_qflags because rootfs can have
 334         * quota acct on ondisk without m_qflags' knowing.
 335         */
 336        if (((flags & XFS_UQUOTA_ACCT) == 0 &&
 337            (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
 338            (flags & XFS_UQUOTA_ENFD))
 339            ||
 340            ((flags & XFS_PQUOTA_ACCT) == 0 &&
 341            (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
 342            (flags & XFS_GQUOTA_ACCT) == 0 &&
 343            (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
 344            (flags & XFS_OQUOTA_ENFD))) {
 345                xfs_debug(mp,
 346                        "%s: Can't enforce without acct, flags=%x sbflags=%x\n",
 347                        __func__, flags, mp->m_sb.sb_qflags);
 348                return XFS_ERROR(EINVAL);
 349        }
 350        /*
 351         * If everything's up to-date incore, then don't waste time.
 352         */
 353        if ((mp->m_qflags & flags) == flags)
 354                return XFS_ERROR(EEXIST);
 355
 356        /*
 357         * Change sb_qflags on disk but not incore mp->qflags
 358         * if this is the root filesystem.
 359         */
 360        spin_lock(&mp->m_sb_lock);
 361        qf = mp->m_sb.sb_qflags;
 362        mp->m_sb.sb_qflags = qf | flags;
 363        spin_unlock(&mp->m_sb_lock);
 364
 365        /*
 366         * There's nothing to change if it's the same.
 367         */
 368        if ((qf & flags) == flags && sbflags == 0)
 369                return XFS_ERROR(EEXIST);
 370        sbflags |= XFS_SB_QFLAGS;
 371
 372        if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
 373                return (error);
 374        /*
 375         * If we aren't trying to switch on quota enforcement, we are done.
 376         */
 377        if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
 378             (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
 379             ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
 380             (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
 381             ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
 382             (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
 383            (flags & XFS_ALL_QUOTA_ENFD) == 0)
 384                return (0);
 385
 386        if (! XFS_IS_QUOTA_RUNNING(mp))
 387                return XFS_ERROR(ESRCH);
 388
 389        /*
 390         * Switch on quota enforcement in core.
 391         */
 392        mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
 393        mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
 394        mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
 395
 396        return (0);
 397}
 398
 399
 400/*
 401 * Return quota status information, such as uquota-off, enforcements, etc.
 402 */
 403int
 404xfs_qm_scall_getqstat(
 405        struct xfs_mount        *mp,
 406        struct fs_quota_stat    *out)
 407{
 408        struct xfs_quotainfo    *q = mp->m_quotainfo;
 409        struct xfs_inode        *uip, *gip;
 410        boolean_t               tempuqip, tempgqip;
 411
 412        uip = gip = NULL;
 413        tempuqip = tempgqip = B_FALSE;
 414        memset(out, 0, sizeof(fs_quota_stat_t));
 415
 416        out->qs_version = FS_QSTAT_VERSION;
 417        if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 418                out->qs_uquota.qfs_ino = NULLFSINO;
 419                out->qs_gquota.qfs_ino = NULLFSINO;
 420                return (0);
 421        }
 422        out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 423                                                        (XFS_ALL_QUOTA_ACCT|
 424                                                         XFS_ALL_QUOTA_ENFD));
 425        out->qs_pad = 0;
 426        out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 427        out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 428
 429        if (q) {
 430                uip = q->qi_uquotaip;
 431                gip = q->qi_gquotaip;
 432        }
 433        if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 434                if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 435                                        0, 0, &uip) == 0)
 436                        tempuqip = B_TRUE;
 437        }
 438        if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 439                if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 440                                        0, 0, &gip) == 0)
 441                        tempgqip = B_TRUE;
 442        }
 443        if (uip) {
 444                out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 445                out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 446                if (tempuqip)
 447                        IRELE(uip);
 448        }
 449        if (gip) {
 450                out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 451                out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 452                if (tempgqip)
 453                        IRELE(gip);
 454        }
 455        if (q) {
 456                out->qs_incoredqs = q->qi_dquots;
 457                out->qs_btimelimit = q->qi_btimelimit;
 458                out->qs_itimelimit = q->qi_itimelimit;
 459                out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 460                out->qs_bwarnlimit = q->qi_bwarnlimit;
 461                out->qs_iwarnlimit = q->qi_iwarnlimit;
 462        }
 463        return 0;
 464}
 465
 466#define XFS_DQ_MASK \
 467        (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)
 468
 469/*
 470 * Adjust quota limits, and start/stop timers accordingly.
 471 */
 472int
 473xfs_qm_scall_setqlim(
 474        xfs_mount_t             *mp,
 475        xfs_dqid_t              id,
 476        uint                    type,
 477        fs_disk_quota_t         *newlim)
 478{
 479        struct xfs_quotainfo    *q = mp->m_quotainfo;
 480        xfs_disk_dquot_t        *ddq;
 481        xfs_dquot_t             *dqp;
 482        xfs_trans_t             *tp;
 483        int                     error;
 484        xfs_qcnt_t              hard, soft;
 485
 486        if (newlim->d_fieldmask & ~XFS_DQ_MASK)
 487                return EINVAL;
 488        if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
 489                return 0;
 490
 491        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
 492        if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_disk_dquot_t) + 128,
 493                                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
 494                xfs_trans_cancel(tp, 0);
 495                return (error);
 496        }
 497
 498        /*
 499         * We don't want to race with a quotaoff so take the quotaoff lock.
 500         * (We don't hold an inode lock, so there's nothing else to stop
 501         * a quotaoff from happening). (XXXThis doesn't currently happen
 502         * because we take the vfslock before calling xfs_qm_sysent).
 503         */
 504        mutex_lock(&q->qi_quotaofflock);
 505
 506        /*
 507         * Get the dquot (locked), and join it to the transaction.
 508         * Allocate the dquot if this doesn't exist.
 509         */
 510        if ((error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp))) {
 511                xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 512                ASSERT(error != ENOENT);
 513                goto out_unlock;
 514        }
 515        xfs_trans_dqjoin(tp, dqp);
 516        ddq = &dqp->q_core;
 517
 518        /*
 519         * Make sure that hardlimits are >= soft limits before changing.
 520         */
 521        hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
 522                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
 523                        be64_to_cpu(ddq->d_blk_hardlimit);
 524        soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
 525                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
 526                        be64_to_cpu(ddq->d_blk_softlimit);
 527        if (hard == 0 || hard >= soft) {
 528                ddq->d_blk_hardlimit = cpu_to_be64(hard);
 529                ddq->d_blk_softlimit = cpu_to_be64(soft);
 530                if (id == 0) {
 531                        q->qi_bhardlimit = hard;
 532                        q->qi_bsoftlimit = soft;
 533                }
 534        } else {
 535                xfs_debug(mp, "blkhard %Ld < blksoft %Ld\n", hard, soft);
 536        }
 537        hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
 538                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
 539                        be64_to_cpu(ddq->d_rtb_hardlimit);
 540        soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
 541                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
 542                        be64_to_cpu(ddq->d_rtb_softlimit);
 543        if (hard == 0 || hard >= soft) {
 544                ddq->d_rtb_hardlimit = cpu_to_be64(hard);
 545                ddq->d_rtb_softlimit = cpu_to_be64(soft);
 546                if (id == 0) {
 547                        q->qi_rtbhardlimit = hard;
 548                        q->qi_rtbsoftlimit = soft;
 549                }
 550        } else {
 551                xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld\n", hard, soft);
 552        }
 553
 554        hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
 555                (xfs_qcnt_t) newlim->d_ino_hardlimit :
 556                        be64_to_cpu(ddq->d_ino_hardlimit);
 557        soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
 558                (xfs_qcnt_t) newlim->d_ino_softlimit :
 559                        be64_to_cpu(ddq->d_ino_softlimit);
 560        if (hard == 0 || hard >= soft) {
 561                ddq->d_ino_hardlimit = cpu_to_be64(hard);
 562                ddq->d_ino_softlimit = cpu_to_be64(soft);
 563                if (id == 0) {
 564                        q->qi_ihardlimit = hard;
 565                        q->qi_isoftlimit = soft;
 566                }
 567        } else {
 568                xfs_debug(mp, "ihard %Ld < isoft %Ld\n", hard, soft);
 569        }
 570
 571        /*
 572         * Update warnings counter(s) if requested
 573         */
 574        if (newlim->d_fieldmask & FS_DQ_BWARNS)
 575                ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
 576        if (newlim->d_fieldmask & FS_DQ_IWARNS)
 577                ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
 578        if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 579                ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);
 580
 581        if (id == 0) {
 582                /*
 583                 * Timelimits for the super user set the relative time
 584                 * the other users can be over quota for this file system.
 585                 * If it is zero a default is used.  Ditto for the default
 586                 * soft and hard limit values (already done, above), and
 587                 * for warnings.
 588                 */
 589                if (newlim->d_fieldmask & FS_DQ_BTIMER) {
 590                        q->qi_btimelimit = newlim->d_btimer;
 591                        ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
 592                }
 593                if (newlim->d_fieldmask & FS_DQ_ITIMER) {
 594                        q->qi_itimelimit = newlim->d_itimer;
 595                        ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
 596                }
 597                if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
 598                        q->qi_rtbtimelimit = newlim->d_rtbtimer;
 599                        ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
 600                }
 601                if (newlim->d_fieldmask & FS_DQ_BWARNS)
 602                        q->qi_bwarnlimit = newlim->d_bwarns;
 603                if (newlim->d_fieldmask & FS_DQ_IWARNS)
 604                        q->qi_iwarnlimit = newlim->d_iwarns;
 605                if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 606                        q->qi_rtbwarnlimit = newlim->d_rtbwarns;
 607        } else {
 608                /*
 609                 * If the user is now over quota, start the timelimit.
 610                 * The user will not be 'warned'.
 611                 * Note that we keep the timers ticking, whether enforcement
 612                 * is on or off. We don't really want to bother with iterating
 613                 * over all ondisk dquots and turning the timers on/off.
 614                 */
 615                xfs_qm_adjust_dqtimers(mp, ddq);
 616        }
 617        dqp->dq_flags |= XFS_DQ_DIRTY;
 618        xfs_trans_log_dquot(tp, dqp);
 619
 620        error = xfs_trans_commit(tp, 0);
 621        xfs_qm_dqrele(dqp);
 622
 623 out_unlock:
 624        mutex_unlock(&q->qi_quotaofflock);
 625        return error;
 626}
 627
 628STATIC int
 629xfs_qm_log_quotaoff_end(
 630        xfs_mount_t             *mp,
 631        xfs_qoff_logitem_t      *startqoff,
 632        uint                    flags)
 633{
 634        xfs_trans_t             *tp;
 635        int                     error;
 636        xfs_qoff_logitem_t      *qoffi;
 637
 638        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
 639
 640        if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_qoff_logitem_t) * 2,
 641                                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
 642                xfs_trans_cancel(tp, 0);
 643                return (error);
 644        }
 645
 646        qoffi = xfs_trans_get_qoff_item(tp, startqoff,
 647                                        flags & XFS_ALL_QUOTA_ACCT);
 648        xfs_trans_log_quotaoff_item(tp, qoffi);
 649
 650        /*
 651         * We have to make sure that the transaction is secure on disk before we
 652         * return and actually stop quota accounting. So, make it synchronous.
 653         * We don't care about quotoff's performance.
 654         */
 655        xfs_trans_set_sync(tp);
 656        error = xfs_trans_commit(tp, 0);
 657        return (error);
 658}
 659
 660
 661STATIC int
 662xfs_qm_log_quotaoff(
 663        xfs_mount_t            *mp,
 664        xfs_qoff_logitem_t     **qoffstartp,
 665        uint                   flags)
 666{
 667        xfs_trans_t            *tp;
 668        int                     error;
 669        xfs_qoff_logitem_t     *qoffi=NULL;
 670        uint                    oldsbqflag=0;
 671
 672        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
 673        if ((error = xfs_trans_reserve(tp, 0,
 674                                      sizeof(xfs_qoff_logitem_t) * 2 +
 675                                      mp->m_sb.sb_sectsize + 128,
 676                                      0,
 677                                      0,
 678                                      XFS_DEFAULT_LOG_COUNT))) {
 679                goto error0;
 680        }
 681
 682        qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
 683        xfs_trans_log_quotaoff_item(tp, qoffi);
 684
 685        spin_lock(&mp->m_sb_lock);
 686        oldsbqflag = mp->m_sb.sb_qflags;
 687        mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
 688        spin_unlock(&mp->m_sb_lock);
 689
 690        xfs_mod_sb(tp, XFS_SB_QFLAGS);
 691
 692        /*
 693         * We have to make sure that the transaction is secure on disk before we
 694         * return and actually stop quota accounting. So, make it synchronous.
 695         * We don't care about quotoff's performance.
 696         */
 697        xfs_trans_set_sync(tp);
 698        error = xfs_trans_commit(tp, 0);
 699
 700error0:
 701        if (error) {
 702                xfs_trans_cancel(tp, 0);
 703                /*
 704                 * No one else is modifying sb_qflags, so this is OK.
 705                 * We still hold the quotaofflock.
 706                 */
 707                spin_lock(&mp->m_sb_lock);
 708                mp->m_sb.sb_qflags = oldsbqflag;
 709                spin_unlock(&mp->m_sb_lock);
 710        }
 711        *qoffstartp = qoffi;
 712        return (error);
 713}
 714
 715
 716int
 717xfs_qm_scall_getquota(
 718        struct xfs_mount        *mp,
 719        xfs_dqid_t              id,
 720        uint                    type,
 721        struct fs_disk_quota    *dst)
 722{
 723        struct xfs_dquot        *dqp;
 724        int                     error;
 725
 726        /*
 727         * Try to get the dquot. We don't want it allocated on disk, so
 728         * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
 729         * exist, we'll get ENOENT back.
 730         */
 731        error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
 732        if (error)
 733                return error;
 734
 735        /*
 736         * If everything's NULL, this dquot doesn't quite exist as far as
 737         * our utility programs are concerned.
 738         */
 739        if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
 740                error = XFS_ERROR(ENOENT);
 741                goto out_put;
 742        }
 743
 744        memset(dst, 0, sizeof(*dst));
 745        dst->d_version = FS_DQUOT_VERSION;
 746        dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
 747        dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 748        dst->d_blk_hardlimit =
 749                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 750        dst->d_blk_softlimit =
 751                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 752        dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 753        dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
 754        dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
 755        dst->d_icount = dqp->q_res_icount;
 756        dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 757        dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 758        dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
 759        dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 760        dst->d_rtb_hardlimit =
 761                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 762        dst->d_rtb_softlimit =
 763                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
 764        dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 765        dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 766        dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 767
 768        /*
 769         * Internally, we don't reset all the timers when quota enforcement
 770         * gets turned off. No need to confuse the user level code,
 771         * so return zeroes in that case.
 772         */
 773        if ((!XFS_IS_UQUOTA_ENFORCED(mp) && dqp->q_core.d_flags == XFS_DQ_USER) ||
 774            (!XFS_IS_OQUOTA_ENFORCED(mp) &&
 775                        (dqp->q_core.d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {
 776                dst->d_btimer = 0;
 777                dst->d_itimer = 0;
 778                dst->d_rtbtimer = 0;
 779        }
 780
 781#ifdef DEBUG
 782        if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
 783             (XFS_IS_OQUOTA_ENFORCED(mp) &&
 784                        (dst->d_flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)))) &&
 785            dst->d_id != 0) {
 786                if (((int) dst->d_bcount > (int) dst->d_blk_softlimit) &&
 787                    (dst->d_blk_softlimit > 0)) {
 788                        ASSERT(dst->d_btimer != 0);
 789                }
 790                if (((int) dst->d_icount > (int) dst->d_ino_softlimit) &&
 791                    (dst->d_ino_softlimit > 0)) {
 792                        ASSERT(dst->d_itimer != 0);
 793                }
 794        }
 795#endif
 796out_put:
 797        xfs_qm_dqput(dqp);
 798        return error;
 799}
 800
 801STATIC uint
 802xfs_qm_export_qtype_flags(
 803        uint flags)
 804{
 805        /*
 806         * Can't be more than one, or none.
 807         */
 808        ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
 809                (FS_PROJ_QUOTA | FS_USER_QUOTA));
 810        ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
 811                (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
 812        ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
 813                (FS_USER_QUOTA | FS_GROUP_QUOTA));
 814        ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);
 815
 816        return (flags & XFS_DQ_USER) ?
 817                FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
 818                        FS_PROJ_QUOTA : FS_GROUP_QUOTA;
 819}
 820
 821STATIC uint
 822xfs_qm_export_flags(
 823        uint flags)
 824{
 825        uint uflags;
 826
 827        uflags = 0;
 828        if (flags & XFS_UQUOTA_ACCT)
 829                uflags |= FS_QUOTA_UDQ_ACCT;
 830        if (flags & XFS_PQUOTA_ACCT)
 831                uflags |= FS_QUOTA_PDQ_ACCT;
 832        if (flags & XFS_GQUOTA_ACCT)
 833                uflags |= FS_QUOTA_GDQ_ACCT;
 834        if (flags & XFS_UQUOTA_ENFD)
 835                uflags |= FS_QUOTA_UDQ_ENFD;
 836        if (flags & (XFS_OQUOTA_ENFD)) {
 837                uflags |= (flags & XFS_GQUOTA_ACCT) ?
 838                        FS_QUOTA_GDQ_ENFD : FS_QUOTA_PDQ_ENFD;
 839        }
 840        return (uflags);
 841}
 842
 843
 844STATIC int
 845xfs_dqrele_inode(
 846        struct xfs_inode        *ip,
 847        struct xfs_perag        *pag,
 848        int                     flags)
 849{
 850        /* skip quota inodes */
 851        if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
 852            ip == ip->i_mount->m_quotainfo->qi_gquotaip) {
 853                ASSERT(ip->i_udquot == NULL);
 854                ASSERT(ip->i_gdquot == NULL);
 855                return 0;
 856        }
 857
 858        xfs_ilock(ip, XFS_ILOCK_EXCL);
 859        if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
 860                xfs_qm_dqrele(ip->i_udquot);
 861                ip->i_udquot = NULL;
 862        }
 863        if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
 864                xfs_qm_dqrele(ip->i_gdquot);
 865                ip->i_gdquot = NULL;
 866        }
 867        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 868        return 0;
 869}
 870
 871
 872/*
 873 * Go thru all the inodes in the file system, releasing their dquots.
 874 *
 875 * Note that the mount structure gets modified to indicate that quotas are off
 876 * AFTER this, in the case of quotaoff.
 877 */
 878void
 879xfs_qm_dqrele_all_inodes(
 880        struct xfs_mount *mp,
 881        uint             flags)
 882{
 883        ASSERT(mp->m_quotainfo);
 884        xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags);
 885}
 886
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