Pileus Git - ~andy/linux/blob - 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;
 282
 283         if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {
 284                 xfs_debug(mp, "%s: flags=%x m_qflags=%x",
 285                         __func__, flags, mp->m_qflags);
 286                 return XFS_ERROR(EINVAL);
 287         }
 288
 289         if (flags & XFS_DQ_USER) {
 290                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
 291                 if (error)
 292                         return error;
 293         }
 294         if (flags & XFS_DQ_GROUP) {
 295                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
 296                 if (error)
 297                         return error;
 298         }
 299         if (flags & XFS_DQ_PROJ)
 300                 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
 301
 302         return error;
 303 }
 304
 305 /*
 306  * Switch on (a given) quota enforcement for a filesystem.  This takes
 307  * effect immediately.
 308  * (Switching on quota accounting must be done at mount time.)
 309  */
 310 int
 311 xfs_qm_scall_quotaon(
 312         xfs_mount_t     *mp,
 313         uint            flags)
 314 {
 315         int             error;
 316         uint            qf;
 317         __int64_t       sbflags;
 318
 319         flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
 320         /*
 321          * Switching on quota accounting must be done at mount time.
 322          */
 323         flags &= ~(XFS_ALL_QUOTA_ACCT);
 324
 325         sbflags = 0;
 326
 327         if (flags == 0) {
 328                 xfs_debug(mp, "%s: zero flags, m_qflags=%x",
 329                         __func__, mp->m_qflags);
 330                 return XFS_ERROR(EINVAL);
 331         }
 332
 333         /* No fs can turn on quotas with a delayed effect */
 334         ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
 335
 336         /*
 337          * Can't enforce without accounting. We check the superblock
 338          * qflags here instead of m_qflags because rootfs can have
 339          * quota acct on ondisk without m_qflags' knowing.
 340          */
 341         if (((flags & XFS_UQUOTA_ACCT) == 0 &&
 342              (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
 343              (flags & XFS_UQUOTA_ENFD)) ||
 344             ((flags & XFS_GQUOTA_ACCT) == 0 &&
 345              (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
 346              (flags & XFS_GQUOTA_ENFD)) ||
 347             ((flags & XFS_PQUOTA_ACCT) == 0 &&
 348              (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
 349              (flags & XFS_PQUOTA_ENFD))) {
 350                 xfs_debug(mp,
 351                         "%s: Can't enforce without acct, flags=%x sbflags=%x",
 352                         __func__, flags, mp->m_sb.sb_qflags);
 353                 return XFS_ERROR(EINVAL);
 354         }
 355         /*
 356          * If everything's up to-date incore, then don't waste time.
 357          */
 358         if ((mp->m_qflags & flags) == flags)
 359                 return XFS_ERROR(EEXIST);
 360
 361         /*
 362          * Change sb_qflags on disk but not incore mp->qflags
 363          * if this is the root filesystem.
 364          */
 365         spin_lock(&mp->m_sb_lock);
 366         qf = mp->m_sb.sb_qflags;
 367         mp->m_sb.sb_qflags = qf | flags;
 368         spin_unlock(&mp->m_sb_lock);
 369
 370         /*
 371          * There's nothing to change if it's the same.
 372          */
 373         if ((qf & flags) == flags && sbflags == 0)
 374                 return XFS_ERROR(EEXIST);
 375         sbflags |= XFS_SB_QFLAGS;
 376
 377         if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
 378                 return (error);
 379         /*
 380          * If we aren't trying to switch on quota enforcement, we are done.
 381          */
 382         if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
 383              (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
 384              ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
 385              (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
 386              ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
 387              (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
 388             (flags & XFS_ALL_QUOTA_ENFD) == 0)
 389                 return (0);
 390
 391         if (! XFS_IS_QUOTA_RUNNING(mp))
 392                 return XFS_ERROR(ESRCH);
 393
 394         /*
 395          * Switch on quota enforcement in core.
 396          */
 397         mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
 398         mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
 399         mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
 400
 401         return (0);
 402 }
 403
 404
 405 /*
 406  * Return quota status information, such as uquota-off, enforcements, etc.
 407  * for Q_XGETQSTAT command.
 408  */
 409 int
 410 xfs_qm_scall_getqstat(
 411         struct xfs_mount        *mp,
 412         struct fs_quota_stat    *out)
 413 {
 414         struct xfs_quotainfo    *q = mp->m_quotainfo;
 415         struct xfs_inode        *uip = NULL;
 416         struct xfs_inode        *gip = NULL;
 417         struct xfs_inode        *pip = NULL;
 418         bool                    tempuqip = false;
 419         bool                    tempgqip = false;
 420         bool                    temppqip = false;
 421
 422         memset(out, 0, sizeof(fs_quota_stat_t));
 423
 424         out->qs_version = FS_QSTAT_VERSION;
 425         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 426                 out->qs_uquota.qfs_ino = NULLFSINO;
 427                 out->qs_gquota.qfs_ino = NULLFSINO;
 428                 return (0);
 429         }
 430
 431         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 432                                                         (XFS_ALL_QUOTA_ACCT|
 433                                                          XFS_ALL_QUOTA_ENFD));
 434         if (q) {
 435                 uip = q->qi_uquotaip;
 436                 gip = q->qi_gquotaip;
 437                 pip = q->qi_pquotaip;
 438         }
 439         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 440                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 441                                         0, 0, &uip) == 0)
 442                         tempuqip = true;
 443         }
 444         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 445                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 446                                         0, 0, &gip) == 0)
 447                         tempgqip = true;
 448         }
 449         /*
 450          * Q_XGETQSTAT doesn't have room for both group and project quotas.
 451          * So, allow the project quota values to be copied out only if
 452          * there is no group quota information available.
 453          */
 454         if (!gip) {
 455                 if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 456                         if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 457                                                 0, 0, &pip) == 0)
 458                                 temppqip = true;
 459                 }
 460         } else
 461                 pip = NULL;
 462         if (uip) {
 463                 out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 464                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 465                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 466                 if (tempuqip)
 467                         IRELE(uip);
 468         }
 469
 470         if (gip) {
 471                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 472                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 473                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 474                 if (tempgqip)
 475                         IRELE(gip);
 476         }
 477         if (pip) {
 478                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 479                 out->qs_gquota.qfs_nblks = pip->i_d.di_nblocks;
 480                 out->qs_gquota.qfs_nextents = pip->i_d.di_nextents;
 481                 if (temppqip)
 482                         IRELE(pip);
 483         }
 484         if (q) {
 485                 out->qs_incoredqs = q->qi_dquots;
 486                 out->qs_btimelimit = q->qi_btimelimit;
 487                 out->qs_itimelimit = q->qi_itimelimit;
 488                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 489                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 490                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 491         }
 492         return 0;
 493 }
 494
 495 /*
 496  * Return quota status information, such as uquota-off, enforcements, etc.
 497  * for Q_XGETQSTATV command, to support separate project quota field.
 498  */
 499 int
 500 xfs_qm_scall_getqstatv(
 501         struct xfs_mount        *mp,
 502         struct fs_quota_statv   *out)
 503 {
 504         struct xfs_quotainfo    *q = mp->m_quotainfo;
 505         struct xfs_inode        *uip = NULL;
 506         struct xfs_inode        *gip = NULL;
 507         struct xfs_inode        *pip = NULL;
 508         bool                    tempuqip = false;
 509         bool                    tempgqip = false;
 510         bool                    temppqip = false;
 511
 512         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 513                 out->qs_uquota.qfs_ino = NULLFSINO;
 514                 out->qs_gquota.qfs_ino = NULLFSINO;
 515                 out->qs_pquota.qfs_ino = NULLFSINO;
 516                 return (0);
 517         }
 518
 519         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 520                                                         (XFS_ALL_QUOTA_ACCT|
 521                                                          XFS_ALL_QUOTA_ENFD));
 522         out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 523         out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 524         out->qs_pquota.qfs_ino = mp->m_sb.sb_pquotino;
 525
 526         if (q) {
 527                 uip = q->qi_uquotaip;
 528                 gip = q->qi_gquotaip;
 529                 pip = q->qi_pquotaip;
 530         }
 531         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 532                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 533                                         0, 0, &uip) == 0)
 534                         tempuqip = true;
 535         }
 536         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 537                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 538                                         0, 0, &gip) == 0)
 539                         tempgqip = true;
 540         }
 541         if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 542                 if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 543                                         0, 0, &pip) == 0)
 544                         temppqip = true;
 545         }
 546         if (uip) {
 547                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 548                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 549                 if (tempuqip)
 550                         IRELE(uip);
 551         }
 552
 553         if (gip) {
 554                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 555                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 556                 if (tempgqip)
 557                         IRELE(gip);
 558         }
 559         if (pip) {
 560                 out->qs_pquota.qfs_nblks = pip->i_d.di_nblocks;
 561                 out->qs_pquota.qfs_nextents = pip->i_d.di_nextents;
 562                 if (temppqip)
 563                         IRELE(pip);
 564         }
 565         if (q) {
 566                 out->qs_incoredqs = q->qi_dquots;
 567                 out->qs_btimelimit = q->qi_btimelimit;
 568                 out->qs_itimelimit = q->qi_itimelimit;
 569                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 570                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 571                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 572         }
 573         return 0;
 574 }
 575
 576 #define XFS_DQ_MASK \
 577         (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)
 578
 579 /*
 580  * Adjust quota limits, and start/stop timers accordingly.
 581  */
 582 int
 583 xfs_qm_scall_setqlim(
 584         struct xfs_mount        *mp,
 585         xfs_dqid_t              id,
 586         uint                    type,
 587         fs_disk_quota_t         *newlim)
 588 {
 589         struct xfs_quotainfo    *q = mp->m_quotainfo;
 590         struct xfs_disk_dquot   *ddq;
 591         struct xfs_dquot        *dqp;
 592         struct xfs_trans        *tp;
 593         int                     error;
 594         xfs_qcnt_t              hard, soft;
 595
 596         if (newlim->d_fieldmask & ~XFS_DQ_MASK)
 597                 return EINVAL;
 598         if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
 599                 return 0;
 600
 601         /*
 602          * We don't want to race with a quotaoff so take the quotaoff lock.
 603          * We don't hold an inode lock, so there's nothing else to stop
 604          * a quotaoff from happening.
 605          */
 606         mutex_lock(&q->qi_quotaofflock);
 607
 608         /*
 609          * Get the dquot (locked) before we start, as we need to do a
 610          * transaction to allocate it if it doesn't exist. Once we have the
 611          * dquot, unlock it so we can start the next transaction safely. We hold
 612          * a reference to the dquot, so it's safe to do this unlock/lock without
 613          * it being reclaimed in the mean time.
 614          */
 615         error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp);
 616         if (error) {
 617                 ASSERT(error != ENOENT);
 618                 goto out_unlock;
 619         }
 620         xfs_dqunlock(dqp);
 621
 622         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
 623         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_setqlim, 0, 0);
 624         if (error) {
 625                 xfs_trans_cancel(tp, 0);
 626                 goto out_rele;
 627         }
 628
 629         xfs_dqlock(dqp);
 630         xfs_trans_dqjoin(tp, dqp);
 631         ddq = &dqp->q_core;
 632
 633         /*
 634          * Make sure that hardlimits are >= soft limits before changing.
 635          */
 636         hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
 637                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
 638                         be64_to_cpu(ddq->d_blk_hardlimit);
 639         soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
 640                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
 641                         be64_to_cpu(ddq->d_blk_softlimit);
 642         if (hard == 0 || hard >= soft) {
 643                 ddq->d_blk_hardlimit = cpu_to_be64(hard);
 644                 ddq->d_blk_softlimit = cpu_to_be64(soft);
 645                 xfs_dquot_set_prealloc_limits(dqp);
 646                 if (id == 0) {
 647                         q->qi_bhardlimit = hard;
 648                         q->qi_bsoftlimit = soft;
 649                 }
 650         } else {
 651                 xfs_debug(mp, "blkhard %Ld < blksoft %Ld", hard, soft);
 652         }
 653         hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
 654                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
 655                         be64_to_cpu(ddq->d_rtb_hardlimit);
 656         soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
 657                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
 658                         be64_to_cpu(ddq->d_rtb_softlimit);
 659         if (hard == 0 || hard >= soft) {
 660                 ddq->d_rtb_hardlimit = cpu_to_be64(hard);
 661                 ddq->d_rtb_softlimit = cpu_to_be64(soft);
 662                 if (id == 0) {
 663                         q->qi_rtbhardlimit = hard;
 664                         q->qi_rtbsoftlimit = soft;
 665                 }
 666         } else {
 667                 xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld", hard, soft);
 668         }
 669
 670         hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
 671                 (xfs_qcnt_t) newlim->d_ino_hardlimit :
 672                         be64_to_cpu(ddq->d_ino_hardlimit);
 673         soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
 674                 (xfs_qcnt_t) newlim->d_ino_softlimit :
 675                         be64_to_cpu(ddq->d_ino_softlimit);
 676         if (hard == 0 || hard >= soft) {
 677                 ddq->d_ino_hardlimit = cpu_to_be64(hard);
 678                 ddq->d_ino_softlimit = cpu_to_be64(soft);
 679                 if (id == 0) {
 680                         q->qi_ihardlimit = hard;
 681                         q->qi_isoftlimit = soft;
 682                 }
 683         } else {
 684                 xfs_debug(mp, "ihard %Ld < isoft %Ld", hard, soft);
 685         }
 686
 687         /*
 688          * Update warnings counter(s) if requested
 689          */
 690         if (newlim->d_fieldmask & FS_DQ_BWARNS)
 691                 ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
 692         if (newlim->d_fieldmask & FS_DQ_IWARNS)
 693                 ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
 694         if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 695                 ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);
 696
 697         if (id == 0) {
 698                 /*
 699                  * Timelimits for the super user set the relative time
 700                  * the other users can be over quota for this file system.
 701                  * If it is zero a default is used.  Ditto for the default
 702                  * soft and hard limit values (already done, above), and
 703                  * for warnings.
 704                  */
 705                 if (newlim->d_fieldmask & FS_DQ_BTIMER) {
 706                         q->qi_btimelimit = newlim->d_btimer;
 707                         ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
 708                 }
 709                 if (newlim->d_fieldmask & FS_DQ_ITIMER) {
 710                         q->qi_itimelimit = newlim->d_itimer;
 711                         ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
 712                 }
 713                 if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
 714                         q->qi_rtbtimelimit = newlim->d_rtbtimer;
 715                         ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
 716                 }
 717                 if (newlim->d_fieldmask & FS_DQ_BWARNS)
 718                         q->qi_bwarnlimit = newlim->d_bwarns;
 719                 if (newlim->d_fieldmask & FS_DQ_IWARNS)
 720                         q->qi_iwarnlimit = newlim->d_iwarns;
 721                 if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 722                         q->qi_rtbwarnlimit = newlim->d_rtbwarns;
 723         } else {
 724                 /*
 725                  * If the user is now over quota, start the timelimit.
 726                  * The user will not be 'warned'.
 727                  * Note that we keep the timers ticking, whether enforcement
 728                  * is on or off. We don't really want to bother with iterating
 729                  * over all ondisk dquots and turning the timers on/off.
 730                  */
 731                 xfs_qm_adjust_dqtimers(mp, ddq);
 732         }
 733         dqp->dq_flags |= XFS_DQ_DIRTY;
 734         xfs_trans_log_dquot(tp, dqp);
 735
 736         error = xfs_trans_commit(tp, 0);
 737
 738 out_rele:
 739         xfs_qm_dqrele(dqp);
 740 out_unlock:
 741         mutex_unlock(&q->qi_quotaofflock);
 742         return error;
 743 }
 744
 745 STATIC int
 746 xfs_qm_log_quotaoff_end(
 747         xfs_mount_t             *mp,
 748         xfs_qoff_logitem_t      *startqoff,
 749         uint                    flags)
 750 {
 751         xfs_trans_t             *tp;
 752         int                     error;
 753         xfs_qoff_logitem_t      *qoffi;
 754
 755         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
 756
 757         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_equotaoff, 0, 0);
 758         if (error) {
 759                 xfs_trans_cancel(tp, 0);
 760                 return (error);
 761         }
 762
 763         qoffi = xfs_trans_get_qoff_item(tp, startqoff,
 764                                         flags & XFS_ALL_QUOTA_ACCT);
 765         xfs_trans_log_quotaoff_item(tp, qoffi);
 766
 767         /*
 768          * We have to make sure that the transaction is secure on disk before we
 769          * return and actually stop quota accounting. So, make it synchronous.
 770          * We don't care about quotoff's performance.
 771          */
 772         xfs_trans_set_sync(tp);
 773         error = xfs_trans_commit(tp, 0);
 774         return (error);
 775 }
 776
 777
 778 STATIC int
 779 xfs_qm_log_quotaoff(
 780         xfs_mount_t            *mp,
 781         xfs_qoff_logitem_t     **qoffstartp,
 782         uint                   flags)
 783 {
 784         xfs_trans_t            *tp;
 785         int                     error;
 786         xfs_qoff_logitem_t     *qoffi=NULL;
 787         uint                    oldsbqflag=0;
 788
 789         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
 790         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_quotaoff, 0, 0);
 791         if (error)
 792                 goto error0;
 793
 794         qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
 795         xfs_trans_log_quotaoff_item(tp, qoffi);
 796
 797         spin_lock(&mp->m_sb_lock);
 798         oldsbqflag = mp->m_sb.sb_qflags;
 799         mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
 800         spin_unlock(&mp->m_sb_lock);
 801
 802         xfs_mod_sb(tp, XFS_SB_QFLAGS);
 803
 804         /*
 805          * We have to make sure that the transaction is secure on disk before we
 806          * return and actually stop quota accounting. So, make it synchronous.
 807          * We don't care about quotoff's performance.
 808          */
 809         xfs_trans_set_sync(tp);
 810         error = xfs_trans_commit(tp, 0);
 811
 812 error0:
 813         if (error) {
 814                 xfs_trans_cancel(tp, 0);
 815                 /*
 816                  * No one else is modifying sb_qflags, so this is OK.
 817                  * We still hold the quotaofflock.
 818                  */
 819                 spin_lock(&mp->m_sb_lock);
 820                 mp->m_sb.sb_qflags = oldsbqflag;
 821                 spin_unlock(&mp->m_sb_lock);
 822         }
 823         *qoffstartp = qoffi;
 824         return (error);
 825 }
 826
 827
 828 int
 829 xfs_qm_scall_getquota(
 830         struct xfs_mount        *mp,
 831         xfs_dqid_t              id,
 832         uint                    type,
 833         struct fs_disk_quota    *dst)
 834 {
 835         struct xfs_dquot        *dqp;
 836         int                     error;
 837
 838         /*
 839          * Try to get the dquot. We don't want it allocated on disk, so
 840          * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
 841          * exist, we'll get ENOENT back.
 842          */
 843         error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
 844         if (error)
 845                 return error;
 846
 847         /*
 848          * If everything's NULL, this dquot doesn't quite exist as far as
 849          * our utility programs are concerned.
 850          */
 851         if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
 852                 error = XFS_ERROR(ENOENT);
 853                 goto out_put;
 854         }
 855
 856         memset(dst, 0, sizeof(*dst));
 857         dst->d_version = FS_DQUOT_VERSION;
 858         dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
 859         dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 860         dst->d_blk_hardlimit =
 861                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 862         dst->d_blk_softlimit =
 863                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 864         dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 865         dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
 866         dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
 867         dst->d_icount = dqp->q_res_icount;
 868         dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 869         dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 870         dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
 871         dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 872         dst->d_rtb_hardlimit =
 873                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 874         dst->d_rtb_softlimit =
 875                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
 876         dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 877         dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 878         dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 879
 880         /*
 881          * Internally, we don't reset all the timers when quota enforcement
 882          * gets turned off. No need to confuse the user level code,
 883          * so return zeroes in that case.
 884          */
 885         if ((!XFS_IS_UQUOTA_ENFORCED(mp) &&
 886              dqp->q_core.d_flags == XFS_DQ_USER) ||
 887             (!XFS_IS_GQUOTA_ENFORCED(mp) &&
 888              dqp->q_core.d_flags == XFS_DQ_GROUP) ||
 889             (!XFS_IS_PQUOTA_ENFORCED(mp) &&
 890              dqp->q_core.d_flags == XFS_DQ_PROJ)) {
 891                 dst->d_btimer = 0;
 892                 dst->d_itimer = 0;
 893                 dst->d_rtbtimer = 0;
 894         }
 895
 896 #ifdef DEBUG
 897         if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
 898              (XFS_IS_GQUOTA_ENFORCED(mp) && dst->d_flags == FS_GROUP_QUOTA) ||
 899              (XFS_IS_PQUOTA_ENFORCED(mp) && dst->d_flags == FS_PROJ_QUOTA)) &&
 900             dst->d_id != 0) {
 901                 if ((dst->d_bcount > dst->d_blk_softlimit) &&
 902                     (dst->d_blk_softlimit > 0)) {
 903                         ASSERT(dst->d_btimer != 0);
 904                 }
 905                 if ((dst->d_icount > dst->d_ino_softlimit) &&
 906                     (dst->d_ino_softlimit > 0)) {
 907                         ASSERT(dst->d_itimer != 0);
 908                 }
 909         }
 910 #endif
 911 out_put:
 912         xfs_qm_dqput(dqp);
 913         return error;
 914 }
 915
 916 STATIC uint
 917 xfs_qm_export_qtype_flags(
 918         uint flags)
 919 {
 920         /*
 921          * Can't be more than one, or none.
 922          */
 923         ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
 924                 (FS_PROJ_QUOTA | FS_USER_QUOTA));
 925         ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
 926                 (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
 927         ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
 928                 (FS_USER_QUOTA | FS_GROUP_QUOTA));
 929         ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);
 930
 931         return (flags & XFS_DQ_USER) ?
 932                 FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
 933                         FS_PROJ_QUOTA : FS_GROUP_QUOTA;
 934 }
 935
 936 STATIC uint
 937 xfs_qm_export_flags(
 938         uint flags)
 939 {
 940         uint uflags;
 941
 942         uflags = 0;
 943         if (flags & XFS_UQUOTA_ACCT)
 944                 uflags |= FS_QUOTA_UDQ_ACCT;
 945         if (flags & XFS_GQUOTA_ACCT)
 946                 uflags |= FS_QUOTA_GDQ_ACCT;
 947         if (flags & XFS_PQUOTA_ACCT)
 948                 uflags |= FS_QUOTA_PDQ_ACCT;
 949         if (flags & XFS_UQUOTA_ENFD)
 950                 uflags |= FS_QUOTA_UDQ_ENFD;
 951         if (flags & XFS_GQUOTA_ENFD)
 952                 uflags |= FS_QUOTA_GDQ_ENFD;
 953         if (flags & XFS_PQUOTA_ENFD)
 954                 uflags |= FS_QUOTA_PDQ_ENFD;
 955         return (uflags);
 956 }
 957
 958
 959 STATIC int
 960 xfs_dqrele_inode(
 961         struct xfs_inode        *ip,
 962         struct xfs_perag        *pag,
 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 }