fs/xfs/xfs_dquot_item.c

   1 /*
   2  * Copyright (c) 2000-2003 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 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_format.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_inode.h"
  27 #include "xfs_quota.h"
  28 #include "xfs_error.h"
  29 #include "xfs_trans.h"
  30 #include "xfs_buf_item.h"
  31 #include "xfs_trans_priv.h"
  32 #include "xfs_qm.h"
  33 #include "xfs_log.h"
  34
  35 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
  36 {
  37         return container_of(lip, struct xfs_dq_logitem, qli_item);
  38 }
  39
  40 /*
  41  * returns the number of iovecs needed to log the given dquot item.
  42  */
  43 STATIC void
  44 xfs_qm_dquot_logitem_size(
  45         struct xfs_log_item     *lip,
  46         int                     *nvecs,
  47         int                     *nbytes)
  48 {
  49         *nvecs += 2;
  50         *nbytes += sizeof(struct xfs_dq_logformat) +
  51                    sizeof(struct xfs_disk_dquot);
  52 }
  53
  54 /*
  55  * fills in the vector of log iovecs for the given dquot log item.
  56  */
  57 STATIC void
  58 xfs_qm_dquot_logitem_format(
  59         struct xfs_log_item     *lip,
  60         struct xfs_log_iovec    *logvec)
  61 {
  62         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
  63
  64         logvec->i_addr = &qlip->qli_format;
  65         logvec->i_len  = sizeof(xfs_dq_logformat_t);
  66         logvec->i_type = XLOG_REG_TYPE_QFORMAT;
  67         logvec++;
  68         logvec->i_addr = &qlip->qli_dquot->q_core;
  69         logvec->i_len  = sizeof(xfs_disk_dquot_t);
  70         logvec->i_type = XLOG_REG_TYPE_DQUOT;
  71
  72         qlip->qli_format.qlf_size = 2;
  73
  74 }
  75
  76 /*
  77  * Increment the pin count of the given dquot.
  78  */
  79 STATIC void
  80 xfs_qm_dquot_logitem_pin(
  81         struct xfs_log_item     *lip)
  82 {
  83         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
  84
  85         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  86         atomic_inc(&dqp->q_pincount);
  87 }
  88
  89 /*
  90  * Decrement the pin count of the given dquot, and wake up
  91  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
  92  * dquot must have been previously pinned with a call to
  93  * xfs_qm_dquot_logitem_pin().
  94  */
  95 STATIC void
  96 xfs_qm_dquot_logitem_unpin(
  97         struct xfs_log_item     *lip,
  98         int                     remove)
  99 {
 100         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 101
 102         ASSERT(atomic_read(&dqp->q_pincount) > 0);
 103         if (atomic_dec_and_test(&dqp->q_pincount))
 104                 wake_up(&dqp->q_pinwait);
 105 }
 106
 107 STATIC xfs_lsn_t
 108 xfs_qm_dquot_logitem_committed(
 109         struct xfs_log_item     *lip,
 110         xfs_lsn_t               lsn)
 111 {
 112         /*
 113          * We always re-log the entire dquot when it becomes dirty,
 114          * so, the latest copy _is_ the only one that matters.
 115          */
 116         return lsn;
 117 }
 118
 119 /*
 120  * This is called to wait for the given dquot to be unpinned.
 121  * Most of these pin/unpin routines are plagiarized from inode code.
 122  */
 123 void
 124 xfs_qm_dqunpin_wait(
 125         struct xfs_dquot        *dqp)
 126 {
 127         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 128         if (atomic_read(&dqp->q_pincount) == 0)
 129                 return;
 130
 131         /*
 132          * Give the log a push so we don't wait here too long.
 133          */
 134         xfs_log_force(dqp->q_mount, 0);
 135         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 136 }
 137
 138 STATIC uint
 139 xfs_qm_dquot_logitem_push(
 140         struct xfs_log_item     *lip,
 141         struct list_head        *buffer_list) __releases(&lip->li_ailp->xa_lock)
 142                                               __acquires(&lip->li_ailp->xa_lock)
 143 {
 144         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 145         struct xfs_buf          *bp = NULL;
 146         uint                    rval = XFS_ITEM_SUCCESS;
 147         int                     error;
 148
 149         if (atomic_read(&dqp->q_pincount) > 0)
 150                 return XFS_ITEM_PINNED;
 151
 152         if (!xfs_dqlock_nowait(dqp))
 153                 return XFS_ITEM_LOCKED;
 154
 155         /*
 156          * Re-check the pincount now that we stabilized the value by
 157          * taking the quota lock.
 158          */
 159         if (atomic_read(&dqp->q_pincount) > 0) {
 160                 rval = XFS_ITEM_PINNED;
 161                 goto out_unlock;
 162         }
 163
 164         /*
 165          * Someone else is already flushing the dquot.  Nothing we can do
 166          * here but wait for the flush to finish and remove the item from
 167          * the AIL.
 168          */
 169         if (!xfs_dqflock_nowait(dqp)) {
 170                 rval = XFS_ITEM_FLUSHING;
 171                 goto out_unlock;
 172         }
 173
 174         spin_unlock(&lip->li_ailp->xa_lock);
 175
 176         error = xfs_qm_dqflush(dqp, &bp);
 177         if (error) {
 178                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
 179                         __func__, error, dqp);
 180         } else {
 181                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 182                         rval = XFS_ITEM_FLUSHING;
 183                 xfs_buf_relse(bp);
 184         }
 185
 186         spin_lock(&lip->li_ailp->xa_lock);
 187 out_unlock:
 188         xfs_dqunlock(dqp);
 189         return rval;
 190 }
 191
 192 /*
 193  * Unlock the dquot associated with the log item.
 194  * Clear the fields of the dquot and dquot log item that
 195  * are specific to the current transaction.  If the
 196  * hold flags is set, do not unlock the dquot.
 197  */
 198 STATIC void
 199 xfs_qm_dquot_logitem_unlock(
 200         struct xfs_log_item     *lip)
 201 {
 202         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 203
 204         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 205
 206         /*
 207          * Clear the transaction pointer in the dquot
 208          */
 209         dqp->q_transp = NULL;
 210
 211         /*
 212          * dquots are never 'held' from getting unlocked at the end of
 213          * a transaction.  Their locking and unlocking is hidden inside the
 214          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 215          * for the logitem.
 216          */
 217         xfs_dqunlock(dqp);
 218 }
 219
 220 /*
 221  * this needs to stamp an lsn into the dquot, I think.
 222  * rpc's that look at user dquot's would then have to
 223  * push on the dependency recorded in the dquot
 224  */
 225 STATIC void
 226 xfs_qm_dquot_logitem_committing(
 227         struct xfs_log_item     *lip,
 228         xfs_lsn_t               lsn)
 229 {
 230 }
 231
 232 /*
 233  * This is the ops vector for dquots
 234  */
 235 static const struct xfs_item_ops xfs_dquot_item_ops = {
 236         .iop_size       = xfs_qm_dquot_logitem_size,
 237         .iop_format     = xfs_qm_dquot_logitem_format,
 238         .iop_pin        = xfs_qm_dquot_logitem_pin,
 239         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 240         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
 241         .iop_committed  = xfs_qm_dquot_logitem_committed,
 242         .iop_push       = xfs_qm_dquot_logitem_push,
 243         .iop_committing = xfs_qm_dquot_logitem_committing
 244 };
 245
 246 /*
 247  * Initialize the dquot log item for a newly allocated dquot.
 248  * The dquot isn't locked at this point, but it isn't on any of the lists
 249  * either, so we don't care.
 250  */
 251 void
 252 xfs_qm_dquot_logitem_init(
 253         struct xfs_dquot        *dqp)
 254 {
 255         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 256
 257         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 258                                         &xfs_dquot_item_ops);
 259         lp->qli_dquot = dqp;
 260         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 261         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
 262         lp->qli_format.qlf_blkno = dqp->q_blkno;
 263         lp->qli_format.qlf_len = 1;
 264         /*
 265          * This is just the offset of this dquot within its buffer
 266          * (which is currently 1 FSB and probably won't change).
 267          * Hence 32 bits for this offset should be just fine.
 268          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 269          * here, and recompute it at recovery time.
 270          */
 271         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 272 }
 273
 274 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 275
 276 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 277 {
 278         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 279 }
 280
 281
 282 /*
 283  * This returns the number of iovecs needed to log the given quotaoff item.
 284  * We only need 1 iovec for an quotaoff item.  It just logs the
 285  * quotaoff_log_format structure.
 286  */
 287 STATIC void
 288 xfs_qm_qoff_logitem_size(
 289         struct xfs_log_item     *lip,
 290         int                     *nvecs,
 291         int                     *nbytes)
 292 {
 293         *nvecs += 1;
 294         *nbytes += sizeof(struct xfs_qoff_logitem);
 295 }
 296
 297 /*
 298  * This is called to fill in the vector of log iovecs for the
 299  * given quotaoff log item. We use only 1 iovec, and we point that
 300  * at the quotaoff_log_format structure embedded in the quotaoff item.
 301  * It is at this point that we assert that all of the extent
 302  * slots in the quotaoff item have been filled.
 303  */
 304 STATIC void
 305 xfs_qm_qoff_logitem_format(
 306         struct xfs_log_item     *lip,
 307         struct xfs_log_iovec    *log_vector)
 308 {
 309         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 310
 311         ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
 312
 313         log_vector->i_addr = &qflip->qql_format;
 314         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 315         log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
 316         qflip->qql_format.qf_size = 1;
 317 }
 318
 319 /*
 320  * Pinning has no meaning for an quotaoff item, so just return.
 321  */
 322 STATIC void
 323 xfs_qm_qoff_logitem_pin(
 324         struct xfs_log_item     *lip)
 325 {
 326 }
 327
 328 /*
 329  * Since pinning has no meaning for an quotaoff item, unpinning does
 330  * not either.
 331  */
 332 STATIC void
 333 xfs_qm_qoff_logitem_unpin(
 334         struct xfs_log_item     *lip,
 335         int                     remove)
 336 {
 337 }
 338
 339 /*
 340  * There isn't much you can do to push a quotaoff item.  It is simply
 341  * stuck waiting for the log to be flushed to disk.
 342  */
 343 STATIC uint
 344 xfs_qm_qoff_logitem_push(
 345         struct xfs_log_item     *lip,
 346         struct list_head        *buffer_list)
 347 {
 348         return XFS_ITEM_LOCKED;
 349 }
 350
 351 /*
 352  * Quotaoff items have no locking or pushing, so return failure
 353  * so that the caller doesn't bother with us.
 354  */
 355 STATIC void
 356 xfs_qm_qoff_logitem_unlock(
 357         struct xfs_log_item     *lip)
 358 {
 359 }
 360
 361 /*
 362  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 363  * so simply return the lsn at which it's been logged.
 364  */
 365 STATIC xfs_lsn_t
 366 xfs_qm_qoff_logitem_committed(
 367         struct xfs_log_item     *lip,
 368         xfs_lsn_t               lsn)
 369 {
 370         return lsn;
 371 }
 372
 373 STATIC xfs_lsn_t
 374 xfs_qm_qoffend_logitem_committed(
 375         struct xfs_log_item     *lip,
 376         xfs_lsn_t               lsn)
 377 {
 378         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 379         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 380         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 381
 382         /*
 383          * Delete the qoff-start logitem from the AIL.
 384          * xfs_trans_ail_delete() drops the AIL lock.
 385          */
 386         spin_lock(&ailp->xa_lock);
 387         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
 388
 389         kmem_free(qfs);
 390         kmem_free(qfe);
 391         return (xfs_lsn_t)-1;
 392 }
 393
 394 /*
 395  * XXX rcc - don't know quite what to do with this.  I think we can
 396  * just ignore it.  The only time that isn't the case is if we allow
 397  * the client to somehow see that quotas have been turned off in which
 398  * we can't allow that to get back until the quotaoff hits the disk.
 399  * So how would that happen?  Also, do we need different routines for
 400  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 401  * to be sure, I need to look at the recovery code and see how quota off
 402  * recovery is handled (do we roll forward or back or do something else).
 403  * If we roll forwards or backwards, then we need two separate routines,
 404  * one that does nothing and one that stamps in the lsn that matters
 405  * (truly makes the quotaoff irrevocable).  If we do something else,
 406  * then maybe we don't need two.
 407  */
 408 STATIC void
 409 xfs_qm_qoff_logitem_committing(
 410         struct xfs_log_item     *lip,
 411         xfs_lsn_t               commit_lsn)
 412 {
 413 }
 414
 415 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 416         .iop_size       = xfs_qm_qoff_logitem_size,
 417         .iop_format     = xfs_qm_qoff_logitem_format,
 418         .iop_pin        = xfs_qm_qoff_logitem_pin,
 419         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 420         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 421         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 422         .iop_push       = xfs_qm_qoff_logitem_push,
 423         .iop_committing = xfs_qm_qoff_logitem_committing
 424 };
 425
 426 /*
 427  * This is the ops vector shared by all quotaoff-start log items.
 428  */
 429 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 430         .iop_size       = xfs_qm_qoff_logitem_size,
 431         .iop_format     = xfs_qm_qoff_logitem_format,
 432         .iop_pin        = xfs_qm_qoff_logitem_pin,
 433         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 434         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 435         .iop_committed  = xfs_qm_qoff_logitem_committed,
 436         .iop_push       = xfs_qm_qoff_logitem_push,
 437         .iop_committing = xfs_qm_qoff_logitem_committing
 438 };
 439
 440 /*
 441  * Allocate and initialize an quotaoff item of the correct quota type(s).
 442  */
 443 struct xfs_qoff_logitem *
 444 xfs_qm_qoff_logitem_init(
 445         struct xfs_mount        *mp,
 446         struct xfs_qoff_logitem *start,
 447         uint                    flags)
 448 {
 449         struct xfs_qoff_logitem *qf;
 450
 451         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
 452
 453         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 454                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 455         qf->qql_item.li_mountp = mp;
 456         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 457         qf->qql_format.qf_flags = flags;
 458         qf->qql_start_lip = start;
 459         return qf;
 460 }