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