fs/xfs/xfs_qm_syscalls.c

   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_shared.h"
  24 #include "xfs_format.h"
  25 #include "xfs_log_format.h"
  26 #include "xfs_trans_resv.h"
  27 #include "xfs_bit.h"
  28 #include "xfs_sb.h"
  29 #include "xfs_ag.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_trans.h"
  33 #include "xfs_error.h"
  34 #include "xfs_quota.h"
  35 #include "xfs_qm.h"
  36 #include "xfs_trace.h"
  37 #include "xfs_icache.h"
  38
  39 STATIC int      xfs_qm_log_quotaoff(xfs_mount_t *, xfs_qoff_logitem_t **, uint);
  40 STATIC int      xfs_qm_log_quotaoff_end(xfs_mount_t *, xfs_qoff_logitem_t *,
  41                                         uint);
  42 STATIC uint     xfs_qm_export_flags(uint);
  43 STATIC uint     xfs_qm_export_qtype_flags(uint);
  44
  45 /*
  46  * Turn off quota accounting and/or enforcement for all udquots and/or
  47  * gdquots. Called only at unmount time.
  48  *
  49  * This assumes that there are no dquots of this file system cached
  50  * incore, and modifies the ondisk dquot directly. Therefore, for example,
  51  * it is an error to call this twice, without purging the cache.
  52  */
  53 int
  54 xfs_qm_scall_quotaoff(
  55         xfs_mount_t             *mp,
  56         uint                    flags)
  57 {
  58         struct xfs_quotainfo    *q = mp->m_quotainfo;
  59         uint                    dqtype;
  60         int                     error;
  61         uint                    inactivate_flags;
  62         xfs_qoff_logitem_t      *qoffstart;
  63
  64         /*
  65          * No file system can have quotas enabled on disk but not in core.
  66          * Note that quota utilities (like quotaoff) _expect_
  67          * errno == EEXIST here.
  68          */
  69         if ((mp->m_qflags & flags) == 0)
  70                 return XFS_ERROR(EEXIST);
  71         error = 0;
  72
  73         flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
  74
  75         /*
  76          * We don't want to deal with two quotaoffs messing up each other,
  77          * so we're going to serialize it. quotaoff isn't exactly a performance
  78          * critical thing.
  79          * If quotaoff, then we must be dealing with the root filesystem.
  80          */
  81         ASSERT(q);
  82         mutex_lock(&q->qi_quotaofflock);
  83
  84         /*
  85          * If we're just turning off quota enforcement, change mp and go.
  86          */
  87         if ((flags & XFS_ALL_QUOTA_ACCT) == 0) {
  88                 mp->m_qflags &= ~(flags);
  89
  90                 spin_lock(&mp->m_sb_lock);
  91                 mp->m_sb.sb_qflags = mp->m_qflags;
  92                 spin_unlock(&mp->m_sb_lock);
  93                 mutex_unlock(&q->qi_quotaofflock);
  94
  95                 /* XXX what to do if error ? Revert back to old vals incore ? */
  96                 error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
  97                 return (error);
  98         }
  99
 100         dqtype = 0;
 101         inactivate_flags = 0;
 102         /*
 103          * If accounting is off, we must turn enforcement off, clear the
 104          * quota 'CHKD' certificate to make it known that we have to
 105          * do a quotacheck the next time this quota is turned on.
 106          */
 107         if (flags & XFS_UQUOTA_ACCT) {
 108                 dqtype |= XFS_QMOPT_UQUOTA;
 109                 flags |= (XFS_UQUOTA_CHKD | XFS_UQUOTA_ENFD);
 110                 inactivate_flags |= XFS_UQUOTA_ACTIVE;
 111         }
 112         if (flags & XFS_GQUOTA_ACCT) {
 113                 dqtype |= XFS_QMOPT_GQUOTA;
 114                 flags |= (XFS_GQUOTA_CHKD | XFS_GQUOTA_ENFD);
 115                 inactivate_flags |= XFS_GQUOTA_ACTIVE;
 116         }
 117         if (flags & XFS_PQUOTA_ACCT) {
 118                 dqtype |= XFS_QMOPT_PQUOTA;
 119                 flags |= (XFS_PQUOTA_CHKD | XFS_PQUOTA_ENFD);
 120                 inactivate_flags |= XFS_PQUOTA_ACTIVE;
 121         }
 122
 123         /*
 124          * Nothing to do?  Don't complain. This happens when we're just
 125          * turning off quota enforcement.
 126          */
 127         if ((mp->m_qflags & flags) == 0)
 128                 goto out_unlock;
 129
 130         /*
 131          * Write the LI_QUOTAOFF log record, and do SB changes atomically,
 132          * and synchronously. If we fail to write, we should abort the
 133          * operation as it cannot be recovered safely if we crash.
 134          */
 135         error = xfs_qm_log_quotaoff(mp, &qoffstart, flags);
 136         if (error)
 137                 goto out_unlock;
 138
 139         /*
 140          * Next we clear the XFS_MOUNT_*DQ_ACTIVE bit(s) in the mount struct
 141          * to take care of the race between dqget and quotaoff. We don't take
 142          * any special locks to reset these bits. All processes need to check
 143          * these bits *after* taking inode lock(s) to see if the particular
 144          * quota type is in the process of being turned off. If *ACTIVE, it is
 145          * guaranteed that all dquot structures and all quotainode ptrs will all
 146          * stay valid as long as that inode is kept locked.
 147          *
 148          * There is no turning back after this.
 149          */
 150         mp->m_qflags &= ~inactivate_flags;
 151
 152         /*
 153          * Give back all the dquot reference(s) held by inodes.
 154          * Here we go thru every single incore inode in this file system, and
 155          * do a dqrele on the i_udquot/i_gdquot that it may have.
 156          * Essentially, as long as somebody has an inode locked, this guarantees
 157          * that quotas will not be turned off. This is handy because in a
 158          * transaction once we lock the inode(s) and check for quotaon, we can
 159          * depend on the quota inodes (and other things) being valid as long as
 160          * we keep the lock(s).
 161          */
 162         xfs_qm_dqrele_all_inodes(mp, flags);
 163
 164         /*
 165          * Next we make the changes in the quota flag in the mount struct.
 166          * This isn't protected by a particular lock directly, because we
 167          * don't want to take a mrlock every time we depend on quotas being on.
 168          */
 169         mp->m_qflags &= ~flags;
 170
 171         /*
 172          * Go through all the dquots of this file system and purge them,
 173          * according to what was turned off.
 174          */
 175         xfs_qm_dqpurge_all(mp, dqtype);
 176
 177         /*
 178          * Transactions that had started before ACTIVE state bit was cleared
 179          * could have logged many dquots, so they'd have higher LSNs than
 180          * the first QUOTAOFF log record does. If we happen to crash when
 181          * the tail of the log has gone past the QUOTAOFF record, but
 182          * before the last dquot modification, those dquots __will__
 183          * recover, and that's not good.
 184          *
 185          * So, we have QUOTAOFF start and end logitems; the start
 186          * logitem won't get overwritten until the end logitem appears...
 187          */
 188         error = xfs_qm_log_quotaoff_end(mp, qoffstart, flags);
 189         if (error) {
 190                 /* We're screwed now. Shutdown is the only option. */
 191                 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 192                 goto out_unlock;
 193         }
 194
 195         /*
 196          * If all quotas are completely turned off, close shop.
 197          */
 198         if (mp->m_qflags == 0) {
 199                 mutex_unlock(&q->qi_quotaofflock);
 200                 xfs_qm_destroy_quotainfo(mp);
 201                 return (0);
 202         }
 203
 204         /*
 205          * Release our quotainode references if we don't need them anymore.
 206          */
 207         if ((dqtype & XFS_QMOPT_UQUOTA) && q->qi_uquotaip) {
 208                 IRELE(q->qi_uquotaip);
 209                 q->qi_uquotaip = NULL;
 210         }
 211         if ((dqtype & XFS_QMOPT_GQUOTA) && q->qi_gquotaip) {
 212                 IRELE(q->qi_gquotaip);
 213                 q->qi_gquotaip = NULL;
 214         }
 215         if ((dqtype & XFS_QMOPT_PQUOTA) && q->qi_pquotaip) {
 216                 IRELE(q->qi_pquotaip);
 217                 q->qi_pquotaip = NULL;
 218         }
 219
 220 out_unlock:
 221         mutex_unlock(&q->qi_quotaofflock);
 222         return error;
 223 }
 224
 225 STATIC int
 226 xfs_qm_scall_trunc_qfile(
 227         struct xfs_mount        *mp,
 228         xfs_ino_t               ino)
 229 {
 230         struct xfs_inode        *ip;
 231         struct xfs_trans        *tp;
 232         int                     error;
 233
 234         if (ino == NULLFSINO)
 235                 return 0;
 236
 237         error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
 238         if (error)
 239                 return error;
 240
 241         xfs_ilock(ip, XFS_IOLOCK_EXCL);
 242
 243         tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE);
 244         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
 245         if (error) {
 246                 xfs_trans_cancel(tp, 0);
 247                 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 248                 goto out_put;
 249         }
 250
 251         xfs_ilock(ip, XFS_ILOCK_EXCL);
 252         xfs_trans_ijoin(tp, ip, 0);
 253
 254         ip->i_d.di_size = 0;
 255         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 256
 257         error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
 258         if (error) {
 259                 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
 260                                      XFS_TRANS_ABORT);
 261                 goto out_unlock;
 262         }
 263
 264         ASSERT(ip->i_d.di_nextents == 0);
 265
 266         xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 267         error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 268
 269 out_unlock:
 270         xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
 271 out_put:
 272         IRELE(ip);
 273         return error;
 274 }
 275
 276 int
 277 xfs_qm_scall_trunc_qfiles(
 278         xfs_mount_t     *mp,
 279         uint            flags)
 280 {
 281         int             error = EINVAL;
 282
 283         if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0 ||
 284             (flags & ~XFS_DQ_ALLTYPES)) {
 285                 xfs_debug(mp, "%s: flags=%x m_qflags=%x",
 286                         __func__, flags, mp->m_qflags);
 287                 return XFS_ERROR(EINVAL);
 288         }
 289
 290         if (flags & XFS_DQ_USER) {
 291                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
 292                 if (error)
 293                         return error;
 294         }
 295         if (flags & XFS_DQ_GROUP) {
 296                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
 297                 if (error)
 298                         return error;
 299         }
 300         if (flags & XFS_DQ_PROJ)
 301                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
 302
 303         return error;
 304 }
 305
 306 /*
 307  * Switch on (a given) quota enforcement for a filesystem.  This takes
 308  * effect immediately.
 309  * (Switching on quota accounting must be done at mount time.)
 310  */
 311 int
 312 xfs_qm_scall_quotaon(
 313         xfs_mount_t     *mp,
 314         uint            flags)
 315 {
 316         int             error;
 317         uint            qf;
 318         __int64_t       sbflags;
 319
 320         flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
 321         /*
 322          * Switching on quota accounting must be done at mount time.
 323          */
 324         flags &= ~(XFS_ALL_QUOTA_ACCT);
 325
 326         sbflags = 0;
 327
 328         if (flags == 0) {
 329                 xfs_debug(mp, "%s: zero flags, m_qflags=%x",
 330                         __func__, mp->m_qflags);
 331                 return XFS_ERROR(EINVAL);
 332         }
 333
 334         /* No fs can turn on quotas with a delayed effect */
 335         ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
 336
 337         /*
 338          * Can't enforce without accounting. We check the superblock
 339          * qflags here instead of m_qflags because rootfs can have
 340          * quota acct on ondisk without m_qflags' knowing.
 341          */
 342         if (((flags & XFS_UQUOTA_ACCT) == 0 &&
 343              (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
 344              (flags & XFS_UQUOTA_ENFD)) ||
 345             ((flags & XFS_GQUOTA_ACCT) == 0 &&
 346              (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
 347              (flags & XFS_GQUOTA_ENFD)) ||
 348             ((flags & XFS_PQUOTA_ACCT) == 0 &&
 349              (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
 350              (flags & XFS_PQUOTA_ENFD))) {
 351                 xfs_debug(mp,
 352                         "%s: Can't enforce without acct, flags=%x sbflags=%x",
 353                         __func__, flags, mp->m_sb.sb_qflags);
 354                 return XFS_ERROR(EINVAL);
 355         }
 356         /*
 357          * If everything's up to-date incore, then don't waste time.
 358          */
 359         if ((mp->m_qflags & flags) == flags)
 360                 return XFS_ERROR(EEXIST);
 361
 362         /*
 363          * Change sb_qflags on disk but not incore mp->qflags
 364          * if this is the root filesystem.
 365          */
 366         spin_lock(&mp->m_sb_lock);
 367         qf = mp->m_sb.sb_qflags;
 368         mp->m_sb.sb_qflags = qf | flags;
 369         spin_unlock(&mp->m_sb_lock);
 370
 371         /*
 372          * There's nothing to change if it's the same.
 373          */
 374         if ((qf & flags) == flags && sbflags == 0)
 375                 return XFS_ERROR(EEXIST);
 376         sbflags |= XFS_SB_QFLAGS;
 377
 378         if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
 379                 return (error);
 380         /*
 381          * If we aren't trying to switch on quota enforcement, we are done.
 382          */
 383         if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
 384              (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
 385              ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
 386              (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
 387              ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
 388              (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
 389             (flags & XFS_ALL_QUOTA_ENFD) == 0)
 390                 return (0);
 391
 392         if (! XFS_IS_QUOTA_RUNNING(mp))
 393                 return XFS_ERROR(ESRCH);
 394
 395         /*
 396          * Switch on quota enforcement in core.
 397          */
 398         mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
 399         mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
 400         mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
 401
 402         return (0);
 403 }
 404
 405
 406 /*
 407  * Return quota status information, such as uquota-off, enforcements, etc.
 408  * for Q_XGETQSTAT command.
 409  */
 410 int
 411 xfs_qm_scall_getqstat(
 412         struct xfs_mount        *mp,
 413         struct fs_quota_stat    *out)
 414 {
 415         struct xfs_quotainfo    *q = mp->m_quotainfo;
 416         struct xfs_inode        *uip = NULL;
 417         struct xfs_inode        *gip = NULL;
 418         struct xfs_inode        *pip = NULL;
 419         bool                    tempuqip = false;
 420         bool                    tempgqip = false;
 421         bool                    temppqip = false;
 422
 423         memset(out, 0, sizeof(fs_quota_stat_t));
 424
 425         out->qs_version = FS_QSTAT_VERSION;
 426         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 427                 out->qs_uquota.qfs_ino = NULLFSINO;
 428                 out->qs_gquota.qfs_ino = NULLFSINO;
 429                 return (0);
 430         }
 431
 432         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 433                                                         (XFS_ALL_QUOTA_ACCT|
 434                                                          XFS_ALL_QUOTA_ENFD));
 435         if (q) {
 436                 uip = q->qi_uquotaip;
 437                 gip = q->qi_gquotaip;
 438                 pip = q->qi_pquotaip;
 439         }
 440         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 441                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 442                                         0, 0, &uip) == 0)
 443                         tempuqip = true;
 444         }
 445         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 446                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 447                                         0, 0, &gip) == 0)
 448                         tempgqip = true;
 449         }
 450         /*
 451          * Q_XGETQSTAT doesn't have room for both group and project quotas.
 452          * So, allow the project quota values to be copied out only if
 453          * there is no group quota information available.
 454          */
 455         if (!gip) {
 456                 if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 457                         if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 458                                                 0, 0, &pip) == 0)
 459                                 temppqip = true;
 460                 }
 461         } else
 462                 pip = NULL;
 463         if (uip) {
 464                 out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 465                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 466                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 467                 if (tempuqip)
 468                         IRELE(uip);
 469         }
 470
 471         if (gip) {
 472                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 473                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 474                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 475                 if (tempgqip)
 476                         IRELE(gip);
 477         }
 478         if (pip) {
 479                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 480                 out->qs_gquota.qfs_nblks = pip->i_d.di_nblocks;
 481                 out->qs_gquota.qfs_nextents = pip->i_d.di_nextents;
 482                 if (temppqip)
 483                         IRELE(pip);
 484         }
 485         if (q) {
 486                 out->qs_incoredqs = q->qi_dquots;
 487                 out->qs_btimelimit = q->qi_btimelimit;
 488                 out->qs_itimelimit = q->qi_itimelimit;
 489                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 490                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 491                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 492         }
 493         return 0;
 494 }
 495
 496 /*
 497  * Return quota status information, such as uquota-off, enforcements, etc.
 498  * for Q_XGETQSTATV command, to support separate project quota field.
 499  */
 500 int
 501 xfs_qm_scall_getqstatv(
 502         struct xfs_mount        *mp,
 503         struct fs_quota_statv   *out)
 504 {
 505         struct xfs_quotainfo    *q = mp->m_quotainfo;
 506         struct xfs_inode        *uip = NULL;
 507         struct xfs_inode        *gip = NULL;
 508         struct xfs_inode        *pip = NULL;
 509         bool                    tempuqip = false;
 510         bool                    tempgqip = false;
 511         bool                    temppqip = false;
 512
 513         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 514                 out->qs_uquota.qfs_ino = NULLFSINO;
 515                 out->qs_gquota.qfs_ino = NULLFSINO;
 516                 out->qs_pquota.qfs_ino = NULLFSINO;
 517                 return (0);
 518         }
 519
 520         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 521                                                         (XFS_ALL_QUOTA_ACCT|
 522                                                          XFS_ALL_QUOTA_ENFD));
 523         out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 524         out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 525         out->qs_pquota.qfs_ino = mp->m_sb.sb_pquotino;
 526
 527         if (q) {
 528                 uip = q->qi_uquotaip;
 529                 gip = q->qi_gquotaip;
 530                 pip = q->qi_pquotaip;
 531         }
 532         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 533                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 534                                         0, 0, &uip) == 0)
 535                         tempuqip = true;
 536         }
 537         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 538                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 539                                         0, 0, &gip) == 0)
 540                         tempgqip = true;
 541         }
 542         if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 543                 if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 544                                         0, 0, &pip) == 0)
 545                         temppqip = true;
 546         }
 547         if (uip) {
 548                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 549                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 550                 if (tempuqip)
 551                         IRELE(uip);
 552         }
 553
 554         if (gip) {
 555                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 556                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 557                 if (tempgqip)
 558                         IRELE(gip);
 559         }
 560         if (pip) {
 561                 out->qs_pquota.qfs_nblks = pip->i_d.di_nblocks;
 562                 out->qs_pquota.qfs_nextents = pip->i_d.di_nextents;
 563                 if (temppqip)
 564                         IRELE(pip);
 565         }
 566         if (q) {
 567                 out->qs_incoredqs = q->qi_dquots;
 568                 out->qs_btimelimit = q->qi_btimelimit;
 569                 out->qs_itimelimit = q->qi_itimelimit;
 570                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 571                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 572                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 573         }
 574         return 0;
 575 }
 576
 577 #define XFS_DQ_MASK \
 578         (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)
 579
 580 /*
 581  * Adjust quota limits, and start/stop timers accordingly.
 582  */
 583 int
 584 xfs_qm_scall_setqlim(
 585         struct xfs_mount        *mp,
 586         xfs_dqid_t              id,
 587         uint                    type,
 588         fs_disk_quota_t         *newlim)
 589 {
 590         struct xfs_quotainfo    *q = mp->m_quotainfo;
 591         struct xfs_disk_dquot   *ddq;
 592         struct xfs_dquot        *dqp;
 593         struct xfs_trans        *tp;
 594         int                     error;
 595         xfs_qcnt_t              hard, soft;
 596
 597         if (newlim->d_fieldmask & ~XFS_DQ_MASK)
 598                 return EINVAL;
 599         if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
 600                 return 0;
 601
 602         /*
 603          * We don't want to race with a quotaoff so take the quotaoff lock.
 604          * We don't hold an inode lock, so there's nothing else to stop
 605          * a quotaoff from happening.
 606          */
 607         mutex_lock(&q->qi_quotaofflock);
 608
 609         /*
 610          * Get the dquot (locked) before we start, as we need to do a
 611          * transaction to allocate it if it doesn't exist. Once we have the
 612          * dquot, unlock it so we can start the next transaction safely. We hold
 613          * a reference to the dquot, so it's safe to do this unlock/lock without
 614          * it being reclaimed in the mean time.
 615          */
 616         error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp);
 617         if (error) {
 618                 ASSERT(error != ENOENT);
 619                 goto out_unlock;
 620         }
 621         xfs_dqunlock(dqp);
 622
 623         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
 624         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_setqlim, 0, 0);
 625         if (error) {
 626                 xfs_trans_cancel(tp, 0);
 627                 goto out_rele;
 628         }
 629
 630         xfs_dqlock(dqp);
 631         xfs_trans_dqjoin(tp, dqp);
 632         ddq = &dqp->q_core;
 633
 634         /*
 635          * Make sure that hardlimits are >= soft limits before changing.
 636          */
 637         hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
 638                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
 639                         be64_to_cpu(ddq->d_blk_hardlimit);
 640         soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
 641                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
 642                         be64_to_cpu(ddq->d_blk_softlimit);
 643         if (hard == 0 || hard >= soft) {
 644                 ddq->d_blk_hardlimit = cpu_to_be64(hard);
 645                 ddq->d_blk_softlimit = cpu_to_be64(soft);
 646                 xfs_dquot_set_prealloc_limits(dqp);
 647                 if (id == 0) {
 648                         q->qi_bhardlimit = hard;
 649                         q->qi_bsoftlimit = soft;
 650                 }
 651         } else {
 652                 xfs_debug(mp, "blkhard %Ld < blksoft %Ld", hard, soft);
 653         }
 654         hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
 655                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
 656                         be64_to_cpu(ddq->d_rtb_hardlimit);
 657         soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
 658                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
 659                         be64_to_cpu(ddq->d_rtb_softlimit);
 660         if (hard == 0 || hard >= soft) {
 661                 ddq->d_rtb_hardlimit = cpu_to_be64(hard);
 662                 ddq->d_rtb_softlimit = cpu_to_be64(soft);
 663                 if (id == 0) {
 664                         q->qi_rtbhardlimit = hard;
 665                         q->qi_rtbsoftlimit = soft;
 666                 }
 667         } else {
 668                 xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld", hard, soft);
 669         }
 670
 671         hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
 672                 (xfs_qcnt_t) newlim->d_ino_hardlimit :
 673                         be64_to_cpu(ddq->d_ino_hardlimit);
 674         soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
 675                 (xfs_qcnt_t) newlim->d_ino_softlimit :
 676                         be64_to_cpu(ddq->d_ino_softlimit);
 677         if (hard == 0 || hard >= soft) {
 678                 ddq->d_ino_hardlimit = cpu_to_be64(hard);
 679                 ddq->d_ino_softlimit = cpu_to_be64(soft);
 680                 if (id == 0) {
 681                         q->qi_ihardlimit = hard;
 682                         q->qi_isoftlimit = soft;
 683                 }
 684         } else {
 685                 xfs_debug(mp, "ihard %Ld < isoft %Ld", hard, soft);
 686         }
 687
 688         /*
 689          * Update warnings counter(s) if requested
 690          */
 691         if (newlim->d_fieldmask & FS_DQ_BWARNS)
 692                 ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
 693         if (newlim->d_fieldmask & FS_DQ_IWARNS)
 694                 ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
 695         if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 696                 ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);
 697
 698         if (id == 0) {
 699                 /*
 700                  * Timelimits for the super user set the relative time
 701                  * the other users can be over quota for this file system.
 702                  * If it is zero a default is used.  Ditto for the default
 703                  * soft and hard limit values (already done, above), and
 704                  * for warnings.
 705                  */
 706                 if (newlim->d_fieldmask & FS_DQ_BTIMER) {
 707                         q->qi_btimelimit = newlim->d_btimer;
 708                         ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
 709                 }
 710                 if (newlim->d_fieldmask & FS_DQ_ITIMER) {
 711                         q->qi_itimelimit = newlim->d_itimer;
 712                         ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
 713                 }
 714                 if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
 715                         q->qi_rtbtimelimit = newlim->d_rtbtimer;
 716                         ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
 717                 }
 718                 if (newlim->d_fieldmask & FS_DQ_BWARNS)
 719                         q->qi_bwarnlimit = newlim->d_bwarns;
 720                 if (newlim->d_fieldmask & FS_DQ_IWARNS)
 721                         q->qi_iwarnlimit = newlim->d_iwarns;
 722                 if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 723                         q->qi_rtbwarnlimit = newlim->d_rtbwarns;
 724         } else {
 725                 /*
 726                  * If the user is now over quota, start the timelimit.
 727                  * The user will not be 'warned'.
 728                  * Note that we keep the timers ticking, whether enforcement
 729                  * is on or off. We don't really want to bother with iterating
 730                  * over all ondisk dquots and turning the timers on/off.
 731                  */
 732                 xfs_qm_adjust_dqtimers(mp, ddq);
 733         }
 734         dqp->dq_flags |= XFS_DQ_DIRTY;
 735         xfs_trans_log_dquot(tp, dqp);
 736
 737         error = xfs_trans_commit(tp, 0);
 738
 739 out_rele:
 740         xfs_qm_dqrele(dqp);
 741 out_unlock:
 742         mutex_unlock(&q->qi_quotaofflock);
 743         return error;
 744 }
 745
 746 STATIC int
 747 xfs_qm_log_quotaoff_end(
 748         xfs_mount_t             *mp,
 749         xfs_qoff_logitem_t      *startqoff,
 750         uint                    flags)
 751 {
 752         xfs_trans_t             *tp;
 753         int                     error;
 754         xfs_qoff_logitem_t      *qoffi;
 755
 756         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
 757
 758         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_equotaoff, 0, 0);
 759         if (error) {
 760                 xfs_trans_cancel(tp, 0);
 761                 return (error);
 762         }
 763
 764         qoffi = xfs_trans_get_qoff_item(tp, startqoff,
 765                                         flags & XFS_ALL_QUOTA_ACCT);
 766         xfs_trans_log_quotaoff_item(tp, qoffi);
 767
 768         /*
 769          * We have to make sure that the transaction is secure on disk before we
 770          * return and actually stop quota accounting. So, make it synchronous.
 771          * We don't care about quotoff's performance.
 772          */
 773         xfs_trans_set_sync(tp);
 774         error = xfs_trans_commit(tp, 0);
 775         return (error);
 776 }
 777
 778
 779 STATIC int
 780 xfs_qm_log_quotaoff(
 781         xfs_mount_t            *mp,
 782         xfs_qoff_logitem_t     **qoffstartp,
 783         uint                   flags)
 784 {
 785         xfs_trans_t            *tp;
 786         int                     error;
 787         xfs_qoff_logitem_t     *qoffi=NULL;
 788         uint                    oldsbqflag=0;
 789
 790         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
 791         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_quotaoff, 0, 0);
 792         if (error)
 793                 goto error0;
 794
 795         qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
 796         xfs_trans_log_quotaoff_item(tp, qoffi);
 797
 798         spin_lock(&mp->m_sb_lock);
 799         oldsbqflag = mp->m_sb.sb_qflags;
 800         mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
 801         spin_unlock(&mp->m_sb_lock);
 802
 803         xfs_mod_sb(tp, XFS_SB_QFLAGS);
 804
 805         /*
 806          * We have to make sure that the transaction is secure on disk before we
 807          * return and actually stop quota accounting. So, make it synchronous.
 808          * We don't care about quotoff's performance.
 809          */
 810         xfs_trans_set_sync(tp);
 811         error = xfs_trans_commit(tp, 0);
 812
 813 error0:
 814         if (error) {
 815                 xfs_trans_cancel(tp, 0);
 816                 /*
 817                  * No one else is modifying sb_qflags, so this is OK.
 818                  * We still hold the quotaofflock.
 819                  */
 820                 spin_lock(&mp->m_sb_lock);
 821                 mp->m_sb.sb_qflags = oldsbqflag;
 822                 spin_unlock(&mp->m_sb_lock);
 823         }
 824         *qoffstartp = qoffi;
 825         return (error);
 826 }
 827
 828
 829 int
 830 xfs_qm_scall_getquota(
 831         struct xfs_mount        *mp,
 832         xfs_dqid_t              id,
 833         uint                    type,
 834         struct fs_disk_quota    *dst)
 835 {
 836         struct xfs_dquot        *dqp;
 837         int                     error;
 838
 839         /*
 840          * Try to get the dquot. We don't want it allocated on disk, so
 841          * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
 842          * exist, we'll get ENOENT back.
 843          */
 844         error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
 845         if (error)
 846                 return error;
 847
 848         /*
 849          * If everything's NULL, this dquot doesn't quite exist as far as
 850          * our utility programs are concerned.
 851          */
 852         if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
 853                 error = XFS_ERROR(ENOENT);
 854                 goto out_put;
 855         }
 856
 857         memset(dst, 0, sizeof(*dst));
 858         dst->d_version = FS_DQUOT_VERSION;
 859         dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
 860         dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 861         dst->d_blk_hardlimit =
 862                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 863         dst->d_blk_softlimit =
 864                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 865         dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 866         dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
 867         dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
 868         dst->d_icount = dqp->q_res_icount;
 869         dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 870         dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 871         dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
 872         dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 873         dst->d_rtb_hardlimit =
 874                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 875         dst->d_rtb_softlimit =
 876                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
 877         dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 878         dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 879         dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 880
 881         /*
 882          * Internally, we don't reset all the timers when quota enforcement
 883          * gets turned off. No need to confuse the user level code,
 884          * so return zeroes in that case.
 885          */
 886         if ((!XFS_IS_UQUOTA_ENFORCED(mp) &&
 887              dqp->q_core.d_flags == XFS_DQ_USER) ||
 888             (!XFS_IS_GQUOTA_ENFORCED(mp) &&
 889              dqp->q_core.d_flags == XFS_DQ_GROUP) ||
 890             (!XFS_IS_PQUOTA_ENFORCED(mp) &&
 891              dqp->q_core.d_flags == XFS_DQ_PROJ)) {
 892                 dst->d_btimer = 0;
 893                 dst->d_itimer = 0;
 894                 dst->d_rtbtimer = 0;
 895         }
 896
 897 #ifdef DEBUG
 898         if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
 899              (XFS_IS_GQUOTA_ENFORCED(mp) && dst->d_flags == FS_GROUP_QUOTA) ||
 900              (XFS_IS_PQUOTA_ENFORCED(mp) && dst->d_flags == FS_PROJ_QUOTA)) &&
 901             dst->d_id != 0) {
 902                 if ((dst->d_bcount > dst->d_blk_softlimit) &&
 903                     (dst->d_blk_softlimit > 0)) {
 904                         ASSERT(dst->d_btimer != 0);
 905                 }
 906                 if ((dst->d_icount > dst->d_ino_softlimit) &&
 907                     (dst->d_ino_softlimit > 0)) {
 908                         ASSERT(dst->d_itimer != 0);
 909                 }
 910         }
 911 #endif
 912 out_put:
 913         xfs_qm_dqput(dqp);
 914         return error;
 915 }
 916
 917 STATIC uint
 918 xfs_qm_export_qtype_flags(
 919         uint flags)
 920 {
 921         /*
 922          * Can't be more than one, or none.
 923          */
 924         ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
 925                 (FS_PROJ_QUOTA | FS_USER_QUOTA));
 926         ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
 927                 (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
 928         ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
 929                 (FS_USER_QUOTA | FS_GROUP_QUOTA));
 930         ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);
 931
 932         return (flags & XFS_DQ_USER) ?
 933                 FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
 934                         FS_PROJ_QUOTA : FS_GROUP_QUOTA;
 935 }
 936
 937 STATIC uint
 938 xfs_qm_export_flags(
 939         uint flags)
 940 {
 941         uint uflags;
 942
 943         uflags = 0;
 944         if (flags & XFS_UQUOTA_ACCT)
 945                 uflags |= FS_QUOTA_UDQ_ACCT;
 946         if (flags & XFS_GQUOTA_ACCT)
 947                 uflags |= FS_QUOTA_GDQ_ACCT;
 948         if (flags & XFS_PQUOTA_ACCT)
 949                 uflags |= FS_QUOTA_PDQ_ACCT;
 950         if (flags & XFS_UQUOTA_ENFD)
 951                 uflags |= FS_QUOTA_UDQ_ENFD;
 952         if (flags & XFS_GQUOTA_ENFD)
 953                 uflags |= FS_QUOTA_GDQ_ENFD;
 954         if (flags & XFS_PQUOTA_ENFD)
 955                 uflags |= FS_QUOTA_PDQ_ENFD;
 956         return (uflags);
 957 }
 958
 959
 960 STATIC int
 961 xfs_dqrele_inode(
 962         struct xfs_inode        *ip,
 963         int                     flags,
 964         void                    *args)
 965 {
 966         /* skip quota inodes */
 967         if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
 968             ip == ip->i_mount->m_quotainfo->qi_gquotaip ||
 969             ip == ip->i_mount->m_quotainfo->qi_pquotaip) {
 970                 ASSERT(ip->i_udquot == NULL);
 971                 ASSERT(ip->i_gdquot == NULL);
 972                 ASSERT(ip->i_pdquot == NULL);
 973                 return 0;
 974         }
 975
 976         xfs_ilock(ip, XFS_ILOCK_EXCL);
 977         if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
 978                 xfs_qm_dqrele(ip->i_udquot);
 979                 ip->i_udquot = NULL;
 980         }
 981         if ((flags & XFS_GQUOTA_ACCT) && ip->i_gdquot) {
 982                 xfs_qm_dqrele(ip->i_gdquot);
 983                 ip->i_gdquot = NULL;
 984         }
 985         if ((flags & XFS_PQUOTA_ACCT) && ip->i_pdquot) {
 986                 xfs_qm_dqrele(ip->i_pdquot);
 987                 ip->i_pdquot = NULL;
 988         }
 989         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 990         return 0;
 991 }
 992
 993
 994 /*
 995  * Go thru all the inodes in the file system, releasing their dquots.
 996  *
 997  * Note that the mount structure gets modified to indicate that quotas are off
 998  * AFTER this, in the case of quotaoff.
 999  */
1000 void
1001 xfs_qm_dqrele_all_inodes(
1002         struct xfs_mount *mp,
1003         uint             flags)
1004 {
1005         ASSERT(mp->m_quotainfo);
1006         xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, NULL);
1007 }