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 = 0, error2 = 0;
 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 (flags & XFS_DQ_GROUP)
 292                 error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
 293         if (flags & XFS_DQ_PROJ)
 294                 error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
 295
 296         return error ? error : error2;
 297 }
 298
 299 /*
 300  * Switch on (a given) quota enforcement for a filesystem.  This takes
 301  * effect immediately.
 302  * (Switching on quota accounting must be done at mount time.)
 303  */
 304 int
 305 xfs_qm_scall_quotaon(
 306         xfs_mount_t     *mp,
 307         uint            flags)
 308 {
 309         int             error;
 310         uint            qf;
 311         __int64_t       sbflags;
 312
 313         flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
 314         /*
 315          * Switching on quota accounting must be done at mount time.
 316          */
 317         flags &= ~(XFS_ALL_QUOTA_ACCT);
 318
 319         sbflags = 0;
 320
 321         if (flags == 0) {
 322                 xfs_debug(mp, "%s: zero flags, m_qflags=%x",
 323                         __func__, mp->m_qflags);
 324                 return XFS_ERROR(EINVAL);
 325         }
 326
 327         /* No fs can turn on quotas with a delayed effect */
 328         ASSERT((flags & XFS_ALL_QUOTA_ACCT) == 0);
 329
 330         /*
 331          * Can't enforce without accounting. We check the superblock
 332          * qflags here instead of m_qflags because rootfs can have
 333          * quota acct on ondisk without m_qflags' knowing.
 334          */
 335         if (((flags & XFS_UQUOTA_ACCT) == 0 &&
 336              (mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
 337              (flags & XFS_UQUOTA_ENFD)) ||
 338             ((flags & XFS_GQUOTA_ACCT) == 0 &&
 339              (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
 340              (flags & XFS_GQUOTA_ENFD)) ||
 341             ((flags & XFS_PQUOTA_ACCT) == 0 &&
 342              (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
 343              (flags & XFS_PQUOTA_ENFD))) {
 344                 xfs_debug(mp,
 345                         "%s: Can't enforce without acct, flags=%x sbflags=%x",
 346                         __func__, flags, mp->m_sb.sb_qflags);
 347                 return XFS_ERROR(EINVAL);
 348         }
 349         /*
 350          * If everything's up to-date incore, then don't waste time.
 351          */
 352         if ((mp->m_qflags & flags) == flags)
 353                 return XFS_ERROR(EEXIST);
 354
 355         /*
 356          * Change sb_qflags on disk but not incore mp->qflags
 357          * if this is the root filesystem.
 358          */
 359         spin_lock(&mp->m_sb_lock);
 360         qf = mp->m_sb.sb_qflags;
 361         mp->m_sb.sb_qflags = qf | flags;
 362         spin_unlock(&mp->m_sb_lock);
 363
 364         /*
 365          * There's nothing to change if it's the same.
 366          */
 367         if ((qf & flags) == flags && sbflags == 0)
 368                 return XFS_ERROR(EEXIST);
 369         sbflags |= XFS_SB_QFLAGS;
 370
 371         if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
 372                 return (error);
 373         /*
 374          * If we aren't trying to switch on quota enforcement, we are done.
 375          */
 376         if  (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
 377              (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
 378              ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
 379              (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
 380              ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
 381              (mp->m_qflags & XFS_GQUOTA_ACCT)) ||
 382             (flags & XFS_ALL_QUOTA_ENFD) == 0)
 383                 return (0);
 384
 385         if (! XFS_IS_QUOTA_RUNNING(mp))
 386                 return XFS_ERROR(ESRCH);
 387
 388         /*
 389          * Switch on quota enforcement in core.
 390          */
 391         mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
 392         mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
 393         mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
 394
 395         return (0);
 396 }
 397
 398
 399 /*
 400  * Return quota status information, such as uquota-off, enforcements, etc.
 401  * for Q_XGETQSTAT command.
 402  */
 403 int
 404 xfs_qm_scall_getqstat(
 405         struct xfs_mount        *mp,
 406         struct fs_quota_stat    *out)
 407 {
 408         struct xfs_quotainfo    *q = mp->m_quotainfo;
 409         struct xfs_inode        *uip = NULL;
 410         struct xfs_inode        *gip = NULL;
 411         struct xfs_inode        *pip = NULL;
 412         bool                    tempuqip = false;
 413         bool                    tempgqip = false;
 414         bool                    temppqip = false;
 415
 416         memset(out, 0, sizeof(fs_quota_stat_t));
 417
 418         out->qs_version = FS_QSTAT_VERSION;
 419         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 420                 out->qs_uquota.qfs_ino = NULLFSINO;
 421                 out->qs_gquota.qfs_ino = NULLFSINO;
 422                 return (0);
 423         }
 424
 425         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 426                                                         (XFS_ALL_QUOTA_ACCT|
 427                                                          XFS_ALL_QUOTA_ENFD));
 428         if (q) {
 429                 uip = q->qi_uquotaip;
 430                 gip = q->qi_gquotaip;
 431                 pip = q->qi_pquotaip;
 432         }
 433         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 434                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 435                                         0, 0, &uip) == 0)
 436                         tempuqip = true;
 437         }
 438         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 439                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 440                                         0, 0, &gip) == 0)
 441                         tempgqip = true;
 442         }
 443         /*
 444          * Q_XGETQSTAT doesn't have room for both group and project quotas.
 445          * So, allow the project quota values to be copied out only if
 446          * there is no group quota information available.
 447          */
 448         if (!gip) {
 449                 if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 450                         if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 451                                                 0, 0, &pip) == 0)
 452                                 temppqip = true;
 453                 }
 454         } else
 455                 pip = NULL;
 456         if (uip) {
 457                 out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 458                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 459                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 460                 if (tempuqip)
 461                         IRELE(uip);
 462         }
 463
 464         if (gip) {
 465                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 466                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 467                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 468                 if (tempgqip)
 469                         IRELE(gip);
 470         }
 471         if (pip) {
 472                 out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 473                 out->qs_gquota.qfs_nblks = pip->i_d.di_nblocks;
 474                 out->qs_gquota.qfs_nextents = pip->i_d.di_nextents;
 475                 if (temppqip)
 476                         IRELE(pip);
 477         }
 478         if (q) {
 479                 out->qs_incoredqs = q->qi_dquots;
 480                 out->qs_btimelimit = q->qi_btimelimit;
 481                 out->qs_itimelimit = q->qi_itimelimit;
 482                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 483                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 484                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 485         }
 486         return 0;
 487 }
 488
 489 /*
 490  * Return quota status information, such as uquota-off, enforcements, etc.
 491  * for Q_XGETQSTATV command, to support separate project quota field.
 492  */
 493 int
 494 xfs_qm_scall_getqstatv(
 495         struct xfs_mount        *mp,
 496         struct fs_quota_statv   *out)
 497 {
 498         struct xfs_quotainfo    *q = mp->m_quotainfo;
 499         struct xfs_inode        *uip = NULL;
 500         struct xfs_inode        *gip = NULL;
 501         struct xfs_inode        *pip = NULL;
 502         bool                    tempuqip = false;
 503         bool                    tempgqip = false;
 504         bool                    temppqip = false;
 505
 506         if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 507                 out->qs_uquota.qfs_ino = NULLFSINO;
 508                 out->qs_gquota.qfs_ino = NULLFSINO;
 509                 out->qs_pquota.qfs_ino = NULLFSINO;
 510                 return (0);
 511         }
 512
 513         out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
 514                                                         (XFS_ALL_QUOTA_ACCT|
 515                                                          XFS_ALL_QUOTA_ENFD));
 516         out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 517         out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
 518         out->qs_pquota.qfs_ino = mp->m_sb.sb_pquotino;
 519
 520         if (q) {
 521                 uip = q->qi_uquotaip;
 522                 gip = q->qi_gquotaip;
 523                 pip = q->qi_pquotaip;
 524         }
 525         if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 526                 if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
 527                                         0, 0, &uip) == 0)
 528                         tempuqip = true;
 529         }
 530         if (!gip && mp->m_sb.sb_gquotino != NULLFSINO) {
 531                 if (xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
 532                                         0, 0, &gip) == 0)
 533                         tempgqip = true;
 534         }
 535         if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
 536                 if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
 537                                         0, 0, &pip) == 0)
 538                         temppqip = true;
 539         }
 540         if (uip) {
 541                 out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 542                 out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
 543                 if (tempuqip)
 544                         IRELE(uip);
 545         }
 546
 547         if (gip) {
 548                 out->qs_gquota.qfs_nblks = gip->i_d.di_nblocks;
 549                 out->qs_gquota.qfs_nextents = gip->i_d.di_nextents;
 550                 if (tempgqip)
 551                         IRELE(gip);
 552         }
 553         if (pip) {
 554                 out->qs_pquota.qfs_nblks = pip->i_d.di_nblocks;
 555                 out->qs_pquota.qfs_nextents = pip->i_d.di_nextents;
 556                 if (temppqip)
 557                         IRELE(pip);
 558         }
 559         if (q) {
 560                 out->qs_incoredqs = q->qi_dquots;
 561                 out->qs_btimelimit = q->qi_btimelimit;
 562                 out->qs_itimelimit = q->qi_itimelimit;
 563                 out->qs_rtbtimelimit = q->qi_rtbtimelimit;
 564                 out->qs_bwarnlimit = q->qi_bwarnlimit;
 565                 out->qs_iwarnlimit = q->qi_iwarnlimit;
 566         }
 567         return 0;
 568 }
 569
 570 #define XFS_DQ_MASK \
 571         (FS_DQ_LIMIT_MASK | FS_DQ_TIMER_MASK | FS_DQ_WARNS_MASK)
 572
 573 /*
 574  * Adjust quota limits, and start/stop timers accordingly.
 575  */
 576 int
 577 xfs_qm_scall_setqlim(
 578         struct xfs_mount        *mp,
 579         xfs_dqid_t              id,
 580         uint                    type,
 581         fs_disk_quota_t         *newlim)
 582 {
 583         struct xfs_quotainfo    *q = mp->m_quotainfo;
 584         struct xfs_disk_dquot   *ddq;
 585         struct xfs_dquot        *dqp;
 586         struct xfs_trans        *tp;
 587         int                     error;
 588         xfs_qcnt_t              hard, soft;
 589
 590         if (newlim->d_fieldmask & ~XFS_DQ_MASK)
 591                 return EINVAL;
 592         if ((newlim->d_fieldmask & XFS_DQ_MASK) == 0)
 593                 return 0;
 594
 595         /*
 596          * We don't want to race with a quotaoff so take the quotaoff lock.
 597          * We don't hold an inode lock, so there's nothing else to stop
 598          * a quotaoff from happening.
 599          */
 600         mutex_lock(&q->qi_quotaofflock);
 601
 602         /*
 603          * Get the dquot (locked) before we start, as we need to do a
 604          * transaction to allocate it if it doesn't exist. Once we have the
 605          * dquot, unlock it so we can start the next transaction safely. We hold
 606          * a reference to the dquot, so it's safe to do this unlock/lock without
 607          * it being reclaimed in the mean time.
 608          */
 609         error = xfs_qm_dqget(mp, NULL, id, type, XFS_QMOPT_DQALLOC, &dqp);
 610         if (error) {
 611                 ASSERT(error != ENOENT);
 612                 goto out_unlock;
 613         }
 614         xfs_dqunlock(dqp);
 615
 616         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SETQLIM);
 617         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_setqlim, 0, 0);
 618         if (error) {
 619                 xfs_trans_cancel(tp, 0);
 620                 goto out_rele;
 621         }
 622
 623         xfs_dqlock(dqp);
 624         xfs_trans_dqjoin(tp, dqp);
 625         ddq = &dqp->q_core;
 626
 627         /*
 628          * Make sure that hardlimits are >= soft limits before changing.
 629          */
 630         hard = (newlim->d_fieldmask & FS_DQ_BHARD) ?
 631                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_hardlimit) :
 632                         be64_to_cpu(ddq->d_blk_hardlimit);
 633         soft = (newlim->d_fieldmask & FS_DQ_BSOFT) ?
 634                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_blk_softlimit) :
 635                         be64_to_cpu(ddq->d_blk_softlimit);
 636         if (hard == 0 || hard >= soft) {
 637                 ddq->d_blk_hardlimit = cpu_to_be64(hard);
 638                 ddq->d_blk_softlimit = cpu_to_be64(soft);
 639                 xfs_dquot_set_prealloc_limits(dqp);
 640                 if (id == 0) {
 641                         q->qi_bhardlimit = hard;
 642                         q->qi_bsoftlimit = soft;
 643                 }
 644         } else {
 645                 xfs_debug(mp, "blkhard %Ld < blksoft %Ld", hard, soft);
 646         }
 647         hard = (newlim->d_fieldmask & FS_DQ_RTBHARD) ?
 648                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_hardlimit) :
 649                         be64_to_cpu(ddq->d_rtb_hardlimit);
 650         soft = (newlim->d_fieldmask & FS_DQ_RTBSOFT) ?
 651                 (xfs_qcnt_t) XFS_BB_TO_FSB(mp, newlim->d_rtb_softlimit) :
 652                         be64_to_cpu(ddq->d_rtb_softlimit);
 653         if (hard == 0 || hard >= soft) {
 654                 ddq->d_rtb_hardlimit = cpu_to_be64(hard);
 655                 ddq->d_rtb_softlimit = cpu_to_be64(soft);
 656                 if (id == 0) {
 657                         q->qi_rtbhardlimit = hard;
 658                         q->qi_rtbsoftlimit = soft;
 659                 }
 660         } else {
 661                 xfs_debug(mp, "rtbhard %Ld < rtbsoft %Ld", hard, soft);
 662         }
 663
 664         hard = (newlim->d_fieldmask & FS_DQ_IHARD) ?
 665                 (xfs_qcnt_t) newlim->d_ino_hardlimit :
 666                         be64_to_cpu(ddq->d_ino_hardlimit);
 667         soft = (newlim->d_fieldmask & FS_DQ_ISOFT) ?
 668                 (xfs_qcnt_t) newlim->d_ino_softlimit :
 669                         be64_to_cpu(ddq->d_ino_softlimit);
 670         if (hard == 0 || hard >= soft) {
 671                 ddq->d_ino_hardlimit = cpu_to_be64(hard);
 672                 ddq->d_ino_softlimit = cpu_to_be64(soft);
 673                 if (id == 0) {
 674                         q->qi_ihardlimit = hard;
 675                         q->qi_isoftlimit = soft;
 676                 }
 677         } else {
 678                 xfs_debug(mp, "ihard %Ld < isoft %Ld", hard, soft);
 679         }
 680
 681         /*
 682          * Update warnings counter(s) if requested
 683          */
 684         if (newlim->d_fieldmask & FS_DQ_BWARNS)
 685                 ddq->d_bwarns = cpu_to_be16(newlim->d_bwarns);
 686         if (newlim->d_fieldmask & FS_DQ_IWARNS)
 687                 ddq->d_iwarns = cpu_to_be16(newlim->d_iwarns);
 688         if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 689                 ddq->d_rtbwarns = cpu_to_be16(newlim->d_rtbwarns);
 690
 691         if (id == 0) {
 692                 /*
 693                  * Timelimits for the super user set the relative time
 694                  * the other users can be over quota for this file system.
 695                  * If it is zero a default is used.  Ditto for the default
 696                  * soft and hard limit values (already done, above), and
 697                  * for warnings.
 698                  */
 699                 if (newlim->d_fieldmask & FS_DQ_BTIMER) {
 700                         q->qi_btimelimit = newlim->d_btimer;
 701                         ddq->d_btimer = cpu_to_be32(newlim->d_btimer);
 702                 }
 703                 if (newlim->d_fieldmask & FS_DQ_ITIMER) {
 704                         q->qi_itimelimit = newlim->d_itimer;
 705                         ddq->d_itimer = cpu_to_be32(newlim->d_itimer);
 706                 }
 707                 if (newlim->d_fieldmask & FS_DQ_RTBTIMER) {
 708                         q->qi_rtbtimelimit = newlim->d_rtbtimer;
 709                         ddq->d_rtbtimer = cpu_to_be32(newlim->d_rtbtimer);
 710                 }
 711                 if (newlim->d_fieldmask & FS_DQ_BWARNS)
 712                         q->qi_bwarnlimit = newlim->d_bwarns;
 713                 if (newlim->d_fieldmask & FS_DQ_IWARNS)
 714                         q->qi_iwarnlimit = newlim->d_iwarns;
 715                 if (newlim->d_fieldmask & FS_DQ_RTBWARNS)
 716                         q->qi_rtbwarnlimit = newlim->d_rtbwarns;
 717         } else {
 718                 /*
 719                  * If the user is now over quota, start the timelimit.
 720                  * The user will not be 'warned'.
 721                  * Note that we keep the timers ticking, whether enforcement
 722                  * is on or off. We don't really want to bother with iterating
 723                  * over all ondisk dquots and turning the timers on/off.
 724                  */
 725                 xfs_qm_adjust_dqtimers(mp, ddq);
 726         }
 727         dqp->dq_flags |= XFS_DQ_DIRTY;
 728         xfs_trans_log_dquot(tp, dqp);
 729
 730         error = xfs_trans_commit(tp, 0);
 731
 732 out_rele:
 733         xfs_qm_dqrele(dqp);
 734 out_unlock:
 735         mutex_unlock(&q->qi_quotaofflock);
 736         return error;
 737 }
 738
 739 STATIC int
 740 xfs_qm_log_quotaoff_end(
 741         xfs_mount_t             *mp,
 742         xfs_qoff_logitem_t      *startqoff,
 743         uint                    flags)
 744 {
 745         xfs_trans_t             *tp;
 746         int                     error;
 747         xfs_qoff_logitem_t      *qoffi;
 748
 749         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF_END);
 750
 751         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_equotaoff, 0, 0);
 752         if (error) {
 753                 xfs_trans_cancel(tp, 0);
 754                 return (error);
 755         }
 756
 757         qoffi = xfs_trans_get_qoff_item(tp, startqoff,
 758                                         flags & XFS_ALL_QUOTA_ACCT);
 759         xfs_trans_log_quotaoff_item(tp, qoffi);
 760
 761         /*
 762          * We have to make sure that the transaction is secure on disk before we
 763          * return and actually stop quota accounting. So, make it synchronous.
 764          * We don't care about quotoff's performance.
 765          */
 766         xfs_trans_set_sync(tp);
 767         error = xfs_trans_commit(tp, 0);
 768         return (error);
 769 }
 770
 771
 772 STATIC int
 773 xfs_qm_log_quotaoff(
 774         xfs_mount_t            *mp,
 775         xfs_qoff_logitem_t     **qoffstartp,
 776         uint                   flags)
 777 {
 778         xfs_trans_t            *tp;
 779         int                     error;
 780         xfs_qoff_logitem_t     *qoffi=NULL;
 781         uint                    oldsbqflag=0;
 782
 783         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
 784         error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_quotaoff, 0, 0);
 785         if (error)
 786                 goto error0;
 787
 788         qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
 789         xfs_trans_log_quotaoff_item(tp, qoffi);
 790
 791         spin_lock(&mp->m_sb_lock);
 792         oldsbqflag = mp->m_sb.sb_qflags;
 793         mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
 794         spin_unlock(&mp->m_sb_lock);
 795
 796         xfs_mod_sb(tp, XFS_SB_QFLAGS);
 797
 798         /*
 799          * We have to make sure that the transaction is secure on disk before we
 800          * return and actually stop quota accounting. So, make it synchronous.
 801          * We don't care about quotoff's performance.
 802          */
 803         xfs_trans_set_sync(tp);
 804         error = xfs_trans_commit(tp, 0);
 805
 806 error0:
 807         if (error) {
 808                 xfs_trans_cancel(tp, 0);
 809                 /*
 810                  * No one else is modifying sb_qflags, so this is OK.
 811                  * We still hold the quotaofflock.
 812                  */
 813                 spin_lock(&mp->m_sb_lock);
 814                 mp->m_sb.sb_qflags = oldsbqflag;
 815                 spin_unlock(&mp->m_sb_lock);
 816         }
 817         *qoffstartp = qoffi;
 818         return (error);
 819 }
 820
 821
 822 int
 823 xfs_qm_scall_getquota(
 824         struct xfs_mount        *mp,
 825         xfs_dqid_t              id,
 826         uint                    type,
 827         struct fs_disk_quota    *dst)
 828 {
 829         struct xfs_dquot        *dqp;
 830         int                     error;
 831
 832         /*
 833          * Try to get the dquot. We don't want it allocated on disk, so
 834          * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
 835          * exist, we'll get ENOENT back.
 836          */
 837         error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
 838         if (error)
 839                 return error;
 840
 841         /*
 842          * If everything's NULL, this dquot doesn't quite exist as far as
 843          * our utility programs are concerned.
 844          */
 845         if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
 846                 error = XFS_ERROR(ENOENT);
 847                 goto out_put;
 848         }
 849
 850         memset(dst, 0, sizeof(*dst));
 851         dst->d_version = FS_DQUOT_VERSION;
 852         dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
 853         dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 854         dst->d_blk_hardlimit =
 855                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 856         dst->d_blk_softlimit =
 857                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 858         dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 859         dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
 860         dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
 861         dst->d_icount = dqp->q_res_icount;
 862         dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 863         dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 864         dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
 865         dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 866         dst->d_rtb_hardlimit =
 867                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 868         dst->d_rtb_softlimit =
 869                 XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
 870         dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 871         dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 872         dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 873
 874         /*
 875          * Internally, we don't reset all the timers when quota enforcement
 876          * gets turned off. No need to confuse the user level code,
 877          * so return zeroes in that case.
 878          */
 879         if ((!XFS_IS_UQUOTA_ENFORCED(mp) &&
 880              dqp->q_core.d_flags == XFS_DQ_USER) ||
 881             (!XFS_IS_GQUOTA_ENFORCED(mp) &&
 882              dqp->q_core.d_flags == XFS_DQ_GROUP) ||
 883             (!XFS_IS_PQUOTA_ENFORCED(mp) &&
 884              dqp->q_core.d_flags == XFS_DQ_PROJ)) {
 885                 dst->d_btimer = 0;
 886                 dst->d_itimer = 0;
 887                 dst->d_rtbtimer = 0;
 888         }
 889
 890 #ifdef DEBUG
 891         if (((XFS_IS_UQUOTA_ENFORCED(mp) && dst->d_flags == FS_USER_QUOTA) ||
 892              (XFS_IS_GQUOTA_ENFORCED(mp) && dst->d_flags == FS_GROUP_QUOTA) ||
 893              (XFS_IS_PQUOTA_ENFORCED(mp) && dst->d_flags == FS_PROJ_QUOTA)) &&
 894             dst->d_id != 0) {
 895                 if ((dst->d_bcount > dst->d_blk_softlimit) &&
 896                     (dst->d_blk_softlimit > 0)) {
 897                         ASSERT(dst->d_btimer != 0);
 898                 }
 899                 if ((dst->d_icount > dst->d_ino_softlimit) &&
 900                     (dst->d_ino_softlimit > 0)) {
 901                         ASSERT(dst->d_itimer != 0);
 902                 }
 903         }
 904 #endif
 905 out_put:
 906         xfs_qm_dqput(dqp);
 907         return error;
 908 }
 909
 910 STATIC uint
 911 xfs_qm_export_qtype_flags(
 912         uint flags)
 913 {
 914         /*
 915          * Can't be more than one, or none.
 916          */
 917         ASSERT((flags & (FS_PROJ_QUOTA | FS_USER_QUOTA)) !=
 918                 (FS_PROJ_QUOTA | FS_USER_QUOTA));
 919         ASSERT((flags & (FS_PROJ_QUOTA | FS_GROUP_QUOTA)) !=
 920                 (FS_PROJ_QUOTA | FS_GROUP_QUOTA));
 921         ASSERT((flags & (FS_USER_QUOTA | FS_GROUP_QUOTA)) !=
 922                 (FS_USER_QUOTA | FS_GROUP_QUOTA));
 923         ASSERT((flags & (FS_PROJ_QUOTA|FS_USER_QUOTA|FS_GROUP_QUOTA)) != 0);
 924
 925         return (flags & XFS_DQ_USER) ?
 926                 FS_USER_QUOTA : (flags & XFS_DQ_PROJ) ?
 927                         FS_PROJ_QUOTA : FS_GROUP_QUOTA;
 928 }
 929
 930 STATIC uint
 931 xfs_qm_export_flags(
 932         uint flags)
 933 {
 934         uint uflags;
 935
 936         uflags = 0;
 937         if (flags & XFS_UQUOTA_ACCT)
 938                 uflags |= FS_QUOTA_UDQ_ACCT;
 939         if (flags & XFS_GQUOTA_ACCT)
 940                 uflags |= FS_QUOTA_GDQ_ACCT;
 941         if (flags & XFS_PQUOTA_ACCT)
 942                 uflags |= FS_QUOTA_PDQ_ACCT;
 943         if (flags & XFS_UQUOTA_ENFD)
 944                 uflags |= FS_QUOTA_UDQ_ENFD;
 945         if (flags & XFS_GQUOTA_ENFD)
 946                 uflags |= FS_QUOTA_GDQ_ENFD;
 947         if (flags & XFS_PQUOTA_ENFD)
 948                 uflags |= FS_QUOTA_PDQ_ENFD;
 949         return (uflags);
 950 }
 951
 952
 953 STATIC int
 954 xfs_dqrele_inode(
 955         struct xfs_inode        *ip,
 956         struct xfs_perag        *pag,
 957         int                     flags,
 958         void                    *args)
 959 {
 960         /* skip quota inodes */
 961         if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
 962             ip == ip->i_mount->m_quotainfo->qi_gquotaip ||
 963             ip == ip->i_mount->m_quotainfo->qi_pquotaip) {
 964                 ASSERT(ip->i_udquot == NULL);
 965                 ASSERT(ip->i_gdquot == NULL);
 966                 ASSERT(ip->i_pdquot == NULL);
 967                 return 0;
 968         }
 969
 970         xfs_ilock(ip, XFS_ILOCK_EXCL);
 971         if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
 972                 xfs_qm_dqrele(ip->i_udquot);
 973                 ip->i_udquot = NULL;
 974         }
 975         if ((flags & XFS_GQUOTA_ACCT) && ip->i_gdquot) {
 976                 xfs_qm_dqrele(ip->i_gdquot);
 977                 ip->i_gdquot = NULL;
 978         }
 979         if ((flags & XFS_PQUOTA_ACCT) && ip->i_pdquot) {
 980                 xfs_qm_dqrele(ip->i_pdquot);
 981                 ip->i_pdquot = NULL;
 982         }
 983         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 984         return 0;
 985 }
 986
 987
 988 /*
 989  * Go thru all the inodes in the file system, releasing their dquots.
 990  *
 991  * Note that the mount structure gets modified to indicate that quotas are off
 992  * AFTER this, in the case of quotaoff.
 993  */
 994 void
 995 xfs_qm_dqrele_all_inodes(
 996         struct xfs_mount *mp,
 997         uint             flags)
 998 {
 999         ASSERT(mp->m_quotainfo);
1000         xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, NULL);
1001 }