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#include "xfs_icache.h"
  44
  45STATIC int      xfs_qm_log_quotaoff(xfs_mount_t *, xfs_qoff_logitem_t **, uint);
  46STATIC int      xfs_qm_log_quotaoff_end(xfs_mount_t *, xfs_qoff_logitem_t *,
  47                                        uint);
  48STATIC uint     xfs_qm_export_flags(uint);
  49STATIC uint     xfs_qm_export_qtype_flags(uint);
  50
  51/*
  52 * Turn off quota accounting and/or enforcement for all udquots and/or
  53 * gdquots. Called only at unmount time.
  54 *
  55 * This assumes that there are no dquots of this file system cached
  56 * incore, and modifies the ondisk dquot directly. Therefore, for example,
  57 * it is an error to call this twice, without purging the cache.
  58 */
  59int
  60xfs_qm_scall_quotaoff(
  61        xfs_mount_t             *mp,
  62        uint                    flags)
  63{
  64        struct xfs_quotainfo    *q = mp->m_quotainfo;
  65        uint                    dqtype;
  66        int                     error;
  67        uint                    inactivate_flags;
  68        xfs_qoff_logitem_t      *qoffstart;
  69
  70        /*
  71         * No file system can have quotas enabled on disk but not in core.
  72         * Note that quota utilities (like quotaoff) _expect_
  73         * errno == EEXIST here.
  74         */
  75        if ((mp->m_qflags & flags) == 0)
  76                return XFS_ERROR(EEXIST);
  77        error = 0;
  78
  79        flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
  80
  81        /*
  82         * We don't want to deal with two quotaoffs messing up each other,
  83         * so we're going to serialize it. quotaoff isn't exactly a performance
  84         * critical thing.
  85         * If quotaoff, then we must be dealing with the root filesystem.
  86         */
  87        ASSERT(q);
  88        mutex_lock(&q->qi_quotaofflock);
  89
  90        /*
  91         * If we're just turning off quota enforcement, change mp and go.
  92         */
  93        if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
  94                mp->m_qflags &= ~(flags);
  95
  96                spin_lock(&mp->m_sb_lock);
  97                mp->m_sb.sb_qflags = mp->m_qflags;
  98                spin_unlock(&mp->m_sb_lock);
  99                mutex_unlock(&q->qi_quotaofflock);
 100
 101                /* XXX what to do if error ? Revert back to old vals incore ? */
 102                error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
 103                return (error);
 104        }
 105
 106        dqtype = 0;
 107        inactivate_flags = 0;
 108        /*
 109         * If accounting is off, we must turn enforcement off, clear the
 110         * quota 'CHKD' certificate to make it known that we have to
 111         * do a quotacheck the next time this quota is turned on.
 112         */
 113        if (flags & XFS_UQUOTA_ACCT) {
 114                dqtype |= XFS_QMOPT_UQUOTA;
 115                flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
 116                inactivate_flags |= XFS_UQUOTA_ACTIVE;
 117        }
 118        if (flags & XFS_GQUOTA_ACCT) {
 119                dqtype |= XFS_QMOPT_GQUOTA;
 120                flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
 121                inactivate_flags |= XFS_GQUOTA_ACTIVE;
 122        } else if (flags & XFS_PQUOTA_ACCT) {
 123                dqtype |= XFS_QMOPT_PQUOTA;
 124                flags |= (XFS_OQUOTA_CHKD | XFS_OQUOTA_ENFD);
 125                inactivate_flags |= XFS_PQUOTA_ACTIVE;
 126        }
 127
 128        /*
 129         * Nothing to do?  Don't complain. This happens when we're just
 130         * turning off quota enforcement.
 131         */
 132        if ((mp->m_qflags & flags) == 0)
 133                goto out_unlock;
 134
 135        /*
 136         * Write the LI_QUOTAOFF log record, and do SB changes atomically,
 137         * and synchronously. If we fail to write, we should abort the
 138         * operation as it cannot be recovered safely if we crash.
 139         */
 140        error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
 141        if (error)
 142                goto out_unlock;
 143
 144        /*
 145         * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
 146         * to take care of the race between dqget and quotaoff. We don't take
 147         * any special locks to reset these bits. All processes need to check
 148         * these bits *after* taking inode lock(s) to see if the particular
 149         * quota type is in the process of being turned off. If *ACTIVE, it is
 150         * guaranteed that all dquot structures and all quotainode ptrs will all
 151         * stay valid as long as that inode is kept locked.
 152         *
 153         * There is no turning back after this.
 154         */
 155        mp->m_qflags &= ~inactivate_flags;
 156
 157        /*
 158         * Give back all the dquot reference(s) held by inodes.
 159         * Here we go thru every single incore inode in this file system, and
 160         * do a dqrele on the i_udquot/i_gdquot that it may have.
 161         * Essentially, as long as somebody has an inode locked, this guarantees
 162         * that quotas will not be turned off. This is handy because in a
 163         * transaction once we lock the inode(s) and check for quotaon, we can
 164         * depend on the quota inodes (and other things) being valid as long as
 165         * we keep the lock(s).
 166         */
 167        xfs_qm_dqrele_all_inodes(mp, flags);
 168
 169        /*
 170         * Next we make the changes in the quota flag in the mount struct.
 171         * This isn't protected by a particular lock directly, because we
 172         * don't want to take a mrlock every time we depend on quotas being on.
 173         */
 174        mp->m_qflags &= ~flags;
 175
 176        /*
 177         * Go through all the dquots of this file system and purge them,
 178         * according to what was turned off.
 179         */
 180        xfs_qm_dqpurge_all(mp, dqtype);
 181
 182        /*
 183         * Transactions that had started before ACTIVE state bit was cleared
 184         * could have logged many dquots, so they'd have higher LSNs than
 185         * the first QUOTAOFF log record does. If we happen to crash when
 186         * the tail of the log has gone past the QUOTAOFF record, but
 187         * before the last dquot modification, those dquots __will__
 188         * recover, and that's not good.
 189         *
 190         * So, we have QUOTAOFF start and end logitems; the start
 191         * logitem won't get overwritten until the end logitem appears...
 192         */
 193        error = xfs_qm_log_quotaoff_end(mp, qoffstart, flags);
 194        if (error) {
 195                /* We're screwed now. Shutdown is the only option. */
 196                xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 197                goto out_unlock;
 198        }
 199
 200        /*
 201         * If quotas is completely disabled, close shop.
 202         */
 203        if (((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET1) ||
 204            ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET2)) {
 205                mutex_unlock(&q->qi_quotaofflock);
 206                xfs_qm_destroy_quotainfo(mp);
 207                return (0);
 208        }
 209
 210        /*
 211         * Release our quotainode references if we don't need them anymore.
 212         */
 213        if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
 214                IRELE(q->qi_uquotaip);
 215                q->qi_uquotaip = NULL;
 216        }
 217        if ((dqtype & (XFS_QMOPT_GQUOTA|XFS_QMOPT_PQUOTA)) && q->qi_gquotaip) {
 218                IRELE(q->qi_gquotaip);
 219                q->qi_gquotaip = NULL;
 220        }
 221
 222out_unlock:
 223        mutex_unlock(&q->qi_quotaofflock);
 224        return error;
 225}
 226
 227STATIC int
 228xfs_qm_scall_trunc_qfile(
 229        struct xfs_mount        *mp,
 230        xfs_ino_t               ino)
 231{
 232        struct xfs_inode        *ip;
 233        struct xfs_trans        *tp;
 234        int                     error;
 235
 236        if (ino == NULLFSINO)
 237                return 0;
 238
 239        error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
 240        if (error)
 241                return error;
 242
 243        xfs_ilock(ip, XFS_IOLOCK_EXCL);
 244
 245        tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
 246        error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
 247                                  XFS_TRANS_PERM_LOG_RES,
 248                                  XFS_ITRUNCATE_LOG_COUNT);
 249        if (error) {
 250                xfs_trans_cancel(tp, 0);
 251                xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 252                goto out_put;
 253        }
 254
 255        xfs_ilock(ip, XFS_ILOCK_EXCL);
 256        xfs_trans_ijoin(tp, ip, 0);
 257
 258        ip->i_d.di_size = 0;
 259        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 260
 261        error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
 262        if (error) {
 263                xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 264                                     XFS_TRANS_ABORT);
 265                goto out_unlock;
 266        }
 267
 268        ASSERT(ip->i_d.di_nextents == 0);
 269
 270        xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 271        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 272
 273out_unlock:
 274        xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
 275out_put:
 276        IRELE(ip);
 277        return error;
 278}
 279
 280int
 281xfs_qm_scall_trunc_qfiles(
 282        xfs_mount_t     *mp,
 283        uint            flags)
 284{
 285        int             error = 0, error2 = 0;
 286
 287        if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {
 288                xfs_debug(mp, "%s: flags=%x m_qflags=%x\n",
 289                        __func__, flags, mp->m_qflags);
 290                return XFS_ERROR(EINVAL);
 291        }
 292
 293        if (flags & XFS_DQ_USER)
 294                error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
 295        if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
 296                error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
 297
 298        return error ? error : error2;
 299}
 300
 301/*
 302 * Switch on (a given) quota enforcement for a filesystem.  This takes
 303 * effect immediately.
 304 * (Switching on quota accounting must be done at mount time.)
 305 */
 306int
 307xfs_qm_scall_quotaon(
 308        xfs_mount_t     *mp,
 309        uint            flags)
 310{
 311        int             error;
 312        uint            qf;
 313        __int64_t       sbflags;
 314
 315        flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
 316        /*
 317         * Switching on quota accounting must be done at mount time.
 318         */
 319        flags &= ~(XFS_ALL_QUOTA_ACCT);
 320
 321        sbflags = 0;
 322
 323        if (flags == 0) {
 324                xfs_debug(mp, "%s: zero flags, m_qflags=%x\n",
 325                        __func__, mp->m_qflags);
 326                return XFS_ERROR(EINVAL);
 327        }
 328
 329        /* No fs can turn on quotas with a delayed effect */
 330        ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
 331
 332        /*
 333         * Can't enforce without accounting. We check the superblock
 334         * qflags here instead of m_qflags because rootfs can have
 335         * quota acct on ondisk without m_qflags' knowing.
 336         */
 337        if (((flags & XFS_UQUOTA_ACCT) == 0 &&
 338            (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
 339            (flags & XFS_UQUOTA_ENFD))
 340            ||
 341            ((flags & XFS_PQUOTA_ACCT) == 0 &&
 342            (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
 343            (flags & XFS_GQUOTA_ACCT) == 0 &&
 344            (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
 345            (flags & XFS_OQUOTA_ENFD))) {
 346                xfs_debug(mp,
 347                        "%s: Can't enforce without acct, flags=%x sbflags=%x\n",
 348                        __func__, flags, mp->m_sb.sb_qflags);
 349                return XFS_ERROR(EINVAL);
 350        }
 351        /*
 352         * If everything's up to-date incore, then don't waste time.
 353         */
 354        if ((mp->m_qflags & flags) == flags)
 355                return XFS_ERROR(EEXIST);
 356
 357        /*
 358         * Change sb_qflags on disk but not incore mp->qflags
 359         * if this is the root filesystem.
 360         */
 361        spin_lock(&mp->m_sb_lock);
 362        qf = mp->m_sb.sb_qflags;
 363        mp->m_sb.sb_qflags = qf | flags;
 364        spin_unlock(&mp->m_sb_lock);
 365
 366        /*
 367         * There's nothing to change if it's the same.
 368         */
 369        if ((qf & flags) == flags && sbflags == 0)
 370                return XFS_ERROR(EEXIST);
 371        sbflags |= XFS_SB_QFLAGS;
 372
 373        if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
 374                return (error);
 375        /*
 376         * If we aren't trying to switch on quota enforcement, we are done.
 377         */
 378        if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
 379             (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
 380             ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
 381             (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
 382             ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
 383             (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
 384            (flags & XFS_ALL_QUOTA_ENFD) == 0)
 385                return (0);
 386
 387        if (! XFS_IS_QUOTA_RUNNING(mp))
 388                return XFS_ERROR(ESRCH);
 389
 390        /*
 391         * Switch on quota enforcement in core.
 392         */
 393        mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
 394        mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
 395        mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
 396
 397        return (0);
 398}
 399
 400
 401/*
 402 * Return quota status information, such as uquota-off, enforcements, etc.
 403 */
 404int
 405xfs_qm_scall_getqstat(
 406        struct xfs_mount        *mp,
 407        struct fs_quota_stat    *out)
 408{
 409        struct xfs_quotainfo    *q = mp->m_quotainfo;
 410        struct xfs_inode        *uip, *gip;
 411        boolean_t               tempuqip, tempgqip;
 412
 413        uip = gip = NULL;
 414        tempuqip = tempgqip = B_FALSE;
 415        memset(out, 0, sizeof(fs_quota_stat_t));
 416
 417        out->qs_version = FS_QSTAT_VERSION;
 418        if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 419                out->qs_uquota.qfs_ino = NULLFSINO;
 420                out->qs_gquota.qfs_ino = NULLFSINO;
 421                return (0);
 422        }
 423        out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 424                                                        (XFS_ALL_QUOTA_ACCT|
 425                                                         XFS_ALL_QUOTA_ENFD));
 426        out->qs_pad = 0;
 427        out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 428        out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 429
 430        if (q) {
 431                uip = q->qi_uquotaip;
 432                gip = q->qi_gquotaip;
 433        }
 434        if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 435                if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 436                                        0, 0, &uip) == 0)
 437                        tempuqip = B_TRUE;
 438        }
 439        if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 440                if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 441                                        0, 0, &gip) == 0)
 442                        tempgqip = B_TRUE;
 443        }
 444        if (uip) {
 445                out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 446                out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 447                if (tempuqip)
 448                        IRELE(uip);
 449        }
 450        if (gip) {
 451                out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 452                out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 453                if (tempgqip)
 454                        IRELE(gip);
 455        }
 456        if (q) {
 457                out->qs_incoredqs = q->qi_dquots;
 458                out->qs_btimelimit = q->qi_btimelimit;
 459                out->qs_itimelimit = q->qi_itimelimit;
 460                out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 461                out->qs_bwarnlimit = q->qi_bwarnlimit;
 462                out->qs_iwarnlimit = q->qi_iwarnlimit;
 463        }
 464        return 0;
 465}
 466
 467#define XFS_DQ_MASK \
 468        (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)
 469
 470/*
 471 * Adjust quota limits, and start/stop timers accordingly.
 472 */
 473int
 474xfs_qm_scall_setqlim(
 475        xfs_mount_t             *mp,
 476        xfs_dqid_t              id,
 477        uint                    type,
 478        fs_disk_quota_t         *newlim)
 479{
 480        struct xfs_quotainfo    *q = mp->m_quotainfo;
 481        xfs_disk_dquot_t        *ddq;
 482        xfs_dquot_t             *dqp;
 483        xfs_trans_t             *tp;
 484        int                     error;
 485        xfs_qcnt_t              hard, soft;
 486
 487        if (newlim->d_fieldmask & ~XFS_DQ_MASK)
 488                return EINVAL;
 489        if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
 490                return 0;
 491
 492        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
 493        if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_disk_dquot_t) + 128,
 494                                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
 495                xfs_trans_cancel(tp, 0);
 496                return (error);
 497        }
 498
 499        /*
 500         * We don't want to race with a quotaoff so take the quotaoff lock.
 501         * (We don't hold an inode lock, so there's nothing else to stop
 502         * a quotaoff from happening). (XXXThis doesn't currently happen
 503         * because we take the vfslock before calling xfs_qm_sysent).
 504         */
 505        mutex_lock(&q->qi_quotaofflock);
 506
 507        /*
 508         * Get the dquot (locked), and join it to the transaction.
 509         * Allocate the dquot if this doesn't exist.
 510         */
 511        if ((error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp))) {
 512                xfs_trans_cancel(tp, XFS_TRANS_ABORT);
 513                ASSERT(error != ENOENT);
 514                goto out_unlock;
 515        }
 516        xfs_trans_dqjoin(tp, dqp);
 517        ddq = &dqp->q_core;
 518
 519        /*
 520         * Make sure that hardlimits are >= soft limits before changing.
 521         */
 522        hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
 523                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
 524                        be64_to_cpu(ddq->d_blk_hardlimit);
 525        soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
 526                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
 527                        be64_to_cpu(ddq->d_blk_softlimit);
 528        if (hard == 0 || hard >= soft) {
 529                ddq->d_blk_hardlimit = cpu_to_be64(hard);
 530                ddq->d_blk_softlimit = cpu_to_be64(soft);
 531                if (id == 0) {
 532                        q->qi_bhardlimit = hard;
 533                        q->qi_bsoftlimit = soft;
 534                }
 535        } else {
 536                xfs_debug(mp, "blkhard %Ld < blksoft %Ld\n", hard, soft);
 537        }
 538        hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
 539                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
 540                        be64_to_cpu(ddq->d_rtb_hardlimit);
 541        soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
 542                (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
 543                        be64_to_cpu(ddq->d_rtb_softlimit);
 544        if (hard == 0 || hard >= soft) {
 545                ddq->d_rtb_hardlimit = cpu_to_be64(hard);
 546                ddq->d_rtb_softlimit = cpu_to_be64(soft);
 547                if (id == 0) {
 548                        q->qi_rtbhardlimit = hard;
 549                        q->qi_rtbsoftlimit = soft;
 550                }
 551        } else {
 552                xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld\n", hard, soft);
 553        }
 554
 555        hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
 556                (xfs_qcnt_t) newlim->d_ino_hardlimit :
 557                        be64_to_cpu(ddq->d_ino_hardlimit);
 558        soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
 559                (xfs_qcnt_t) newlim->d_ino_softlimit :
 560                        be64_to_cpu(ddq->d_ino_softlimit);
 561        if (hard == 0 || hard >= soft) {
 562                ddq->d_ino_hardlimit = cpu_to_be64(hard);
 563                ddq->d_ino_softlimit = cpu_to_be64(soft);
 564                if (id == 0) {
 565                        q->qi_ihardlimit = hard;
 566                        q->qi_isoftlimit = soft;
 567                }
 568        } else {
 569                xfs_debug(mp, "ihard %Ld < isoft %Ld\n", hard, soft);
 570        }
 571
 572        /*
 573         * Update warnings counter(s) if requested
 574         */
 575        if (newlim->d_fieldmask & FS_DQ_BWARNS)
 576                ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
 577        if (newlim->d_fieldmask & FS_DQ_IWARNS)
 578                ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
 579        if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 580                ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);
 581
 582        if (id == 0) {
 583                /*
 584                 * Timelimits for the super user set the relative time
 585                 * the other users can be over quota for this file system.
 586                 * If it is zero a default is used.  Ditto for the default
 587                 * soft and hard limit values (already done, above), and
 588                 * for warnings.
 589                 */
 590                if (newlim->d_fieldmask & FS_DQ_BTIMER) {
 591                        q->qi_btimelimit = newlim->d_btimer;
 592                        ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
 593                }
 594                if (newlim->d_fieldmask & FS_DQ_ITIMER) {
 595                        q->qi_itimelimit = newlim->d_itimer;
 596                        ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
 597                }
 598                if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
 599                        q->qi_rtbtimelimit = newlim->d_rtbtimer;
 600                        ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
 601                }
 602                if (newlim->d_fieldmask & FS_DQ_BWARNS)
 603                        q->qi_bwarnlimit = newlim->d_bwarns;
 604                if (newlim->d_fieldmask & FS_DQ_IWARNS)
 605                        q->qi_iwarnlimit = newlim->d_iwarns;
 606                if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 607                        q->qi_rtbwarnlimit = newlim->d_rtbwarns;
 608        } else {
 609                /*
 610                 * If the user is now over quota, start the timelimit.
 611                 * The user will not be 'warned'.
 612                 * Note that we keep the timers ticking, whether enforcement
 613                 * is on or off. We don't really want to bother with iterating
 614                 * over all ondisk dquots and turning the timers on/off.
 615                 */
 616                xfs_qm_adjust_dqtimers(mp, ddq);
 617        }
 618        dqp->dq_flags |= XFS_DQ_DIRTY;
 619        xfs_trans_log_dquot(tp, dqp);
 620
 621        error = xfs_trans_commit(tp, 0);
 622        xfs_qm_dqrele(dqp);
 623
 624 out_unlock:
 625        mutex_unlock(&q->qi_quotaofflock);
 626        return error;
 627}
 628
 629STATIC int
 630xfs_qm_log_quotaoff_end(
 631        xfs_mount_t             *mp,
 632        xfs_qoff_logitem_t      *startqoff,
 633        uint                    flags)
 634{
 635        xfs_trans_t             *tp;
 636        int                     error;
 637        xfs_qoff_logitem_t      *qoffi;
 638
 639        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
 640
 641        if ((error = xfs_trans_reserve(tp, 0, sizeof(xfs_qoff_logitem_t) * 2,
 642                                      0, 0, XFS_DEFAULT_LOG_COUNT))) {
 643                xfs_trans_cancel(tp, 0);
 644                return (error);
 645        }
 646
 647        qoffi = xfs_trans_get_qoff_item(tp, startqoff,
 648                                        flags & XFS_ALL_QUOTA_ACCT);
 649        xfs_trans_log_quotaoff_item(tp, qoffi);
 650
 651        /*
 652         * We have to make sure that the transaction is secure on disk before we
 653         * return and actually stop quota accounting. So, make it synchronous.
 654         * We don't care about quotoff's performance.
 655         */
 656        xfs_trans_set_sync(tp);
 657        error = xfs_trans_commit(tp, 0);
 658        return (error);
 659}
 660
 661
 662STATIC int
 663xfs_qm_log_quotaoff(
 664        xfs_mount_t            *mp,
 665        xfs_qoff_logitem_t     **qoffstartp,
 666        uint                   flags)
 667{
 668        xfs_trans_t            *tp;
 669        int                     error;
 670        xfs_qoff_logitem_t     *qoffi=NULL;
 671        uint                    oldsbqflag=0;
 672
 673        tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
 674        if ((error = xfs_trans_reserve(tp, 0,
 675                                      sizeof(xfs_qoff_logitem_t) * 2 +
 676                                      mp->m_sb.sb_sectsize + 128,
 677                                      0,
 678                                      0,
 679                                      XFS_DEFAULT_LOG_COUNT))) {
 680                goto error0;
 681        }
 682
 683        qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
 684        xfs_trans_log_quotaoff_item(tp, qoffi);
 685
 686        spin_lock(&mp->m_sb_lock);
 687        oldsbqflag = mp->m_sb.sb_qflags;
 688        mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
 689        spin_unlock(&mp->m_sb_lock);
 690
 691        xfs_mod_sb(tp, XFS_SB_QFLAGS);
 692
 693        /*
 694         * We have to make sure that the transaction is secure on disk before we
 695         * return and actually stop quota accounting. So, make it synchronous.
 696         * We don't care about quotoff's performance.
 697         */
 698        xfs_trans_set_sync(tp);
 699        error = xfs_trans_commit(tp, 0);
 700
 701error0:
 702        if (error) {
 703                xfs_trans_cancel(tp, 0);
 704                /*
 705                 * No one else is modifying sb_qflags, so this is OK.
 706                 * We still hold the quotaofflock.
 707                 */
 708                spin_lock(&mp->m_sb_lock);
 709                mp->m_sb.sb_qflags = oldsbqflag;
 710                spin_unlock(&mp->m_sb_lock);
 711        }
 712        *qoffstartp = qoffi;
 713        return (error);
 714}
 715
 716
 717int
 718xfs_qm_scall_getquota(
 719        struct xfs_mount        *mp,
 720        xfs_dqid_t              id,
 721        uint                    type,
 722        struct fs_disk_quota    *dst)
 723{
 724        struct xfs_dquot        *dqp;
 725        int                     error;
 726
 727        /*
 728         * Try to get the dquot. We don't want it allocated on disk, so
 729         * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
 730         * exist, we'll get ENOENT back.
 731         */
 732        error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
 733        if (error)
 734                return error;
 735
 736        /*
 737         * If everything's NULL, this dquot doesn't quite exist as far as
 738         * our utility programs are concerned.
 739         */
 740        if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
 741                error = XFS_ERROR(ENOENT);
 742                goto out_put;
 743        }
 744
 745        memset(dst, 0, sizeof(*dst));
 746        dst->d_version = FS_DQUOT_VERSION;
 747        dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
 748        dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 749        dst->d_blk_hardlimit =
 750                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 751        dst->d_blk_softlimit =
 752                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 753        dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 754        dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
 755        dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
 756        dst->d_icount = dqp->q_res_icount;
 757        dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 758        dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 759        dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
 760        dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 761        dst->d_rtb_hardlimit =
 762                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 763        dst->d_rtb_softlimit =
 764                XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
 765        dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 766        dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 767        dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 768
 769        /*
 770         * Internally, we don't reset all the timers when quota enforcement
 771         * gets turned off. No need to confuse the user level code,
 772         * so return zeroes in that case.
 773         */
 774        if ((!XFS_IS_UQUOTA_ENFORCED(mp) && dqp->q_core.d_flags == XFS_DQ_USER) ||
 775            (!XFS_IS_OQUOTA_ENFORCED(mp) &&
 776                        (dqp->q_core.d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {
 777                dst->d_btimer = 0;
 778                dst->d_itimer = 0;
 779                dst->d_rtbtimer = 0;
 780        }
 781
 782#ifdef DEBUG
 783        if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
 784             (XFS_IS_OQUOTA_ENFORCED(mp) &&
 785                        (dst->d_flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)))) &&
 786            dst->d_id != 0) {
 787                if ((dst->d_bcount > dst->d_blk_softlimit) &&
 788                    (dst->d_blk_softlimit > 0)) {
 789                        ASSERT(dst->d_btimer != 0);
 790                }
 791                if ((dst->d_icount > dst->d_ino_softlimit) &&
 792                    (dst->d_ino_softlimit > 0)) {
 793                        ASSERT(dst->d_itimer != 0);
 794                }
 795        }
 796#endif
 797out_put:
 798        xfs_qm_dqput(dqp);
 799        return error;
 800}
 801
 802STATIC uint
 803xfs_qm_export_qtype_flags(
 804        uint flags)
 805{
 806        /*
 807         * Can't be more than one, or none.
 808         */
 809        ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
 810                (FS_PROJ_QUOTA | FS_USER_QUOTA));
 811        ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
 812                (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
 813        ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
 814                (FS_USER_QUOTA | FS_GROUP_QUOTA));
 815        ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);
 816
 817        return (flags & XFS_DQ_USER) ?
 818                FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
 819                        FS_PROJ_QUOTA : FS_GROUP_QUOTA;
 820}
 821
 822STATIC uint
 823xfs_qm_export_flags(
 824        uint flags)
 825{
 826        uint uflags;
 827
 828        uflags = 0;
 829        if (flags & XFS_UQUOTA_ACCT)
 830                uflags |= FS_QUOTA_UDQ_ACCT;
 831        if (flags & XFS_PQUOTA_ACCT)
 832                uflags |= FS_QUOTA_PDQ_ACCT;
 833        if (flags & XFS_GQUOTA_ACCT)
 834                uflags |= FS_QUOTA_GDQ_ACCT;
 835        if (flags & XFS_UQUOTA_ENFD)
 836                uflags |= FS_QUOTA_UDQ_ENFD;
 837        if (flags & (XFS_OQUOTA_ENFD)) {
 838                uflags |= (flags & XFS_GQUOTA_ACCT) ?
 839                        FS_QUOTA_GDQ_ENFD : FS_QUOTA_PDQ_ENFD;
 840        }
 841        return (uflags);
 842}
 843
 844
 845STATIC int
 846xfs_dqrele_inode(
 847        struct xfs_inode        *ip,
 848        struct xfs_perag        *pag,
 849        int                     flags,
 850        void                    *args)
 851{
 852        /* skip quota inodes */
 853        if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
 854            ip == ip->i_mount->m_quotainfo->qi_gquotaip) {
 855                ASSERT(ip->i_udquot == NULL);
 856                ASSERT(ip->i_gdquot == NULL);
 857                return 0;
 858        }
 859
 860        xfs_ilock(ip, XFS_ILOCK_EXCL);
 861        if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
 862                xfs_qm_dqrele(ip->i_udquot);
 863                ip->i_udquot = NULL;
 864        }
 865        if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
 866                xfs_qm_dqrele(ip->i_gdquot);
 867                ip->i_gdquot = NULL;
 868        }
 869        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 870        return 0;
 871}
 872
 873
 874/*
 875 * Go thru all the inodes in the file system, releasing their dquots.
 876 *
 877 * Note that the mount structure gets modified to indicate that quotas are off
 878 * AFTER this, in the case of quotaoff.
 879 */
 880void
 881xfs_qm_dqrele_all_inodes(
 882        struct xfs_mount *mp,
 883        uint             flags)
 884{
 885        ASSERT(mp->m_quotainfo);
 886        xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, NULL);
 887}
 888
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