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_mount.h"
  24 #include "xfs_inode.h"
  25 #include "xfs_quota.h"
  26 #include "xfs_error.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_buf_item.h"
  29 #include "xfs_trans_priv.h"
  30 #include "xfs_qm.h"
  31 #include "xfs_log.h"
  32
  33 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
  34 {
  35         return container_of(lip, struct xfs_dq_logitem, qli_item);
  36 }
  37
  38 /*
  39  * returns the number of iovecs needed to log the given dquot item.
  40  */
  41 STATIC void
  42 xfs_qm_dquot_logitem_size(
  43         struct xfs_log_item     *lip,
  44         int                     *nvecs,
  45         int                     *nbytes)
  46 {
  47         *nvecs += 2;
  48         *nbytes += sizeof(struct xfs_dq_logformat) +
  49                    sizeof(struct xfs_disk_dquot);
  50 }
  51
  52 /*
  53  * fills in the vector of log iovecs for the given dquot log item.
  54  */
  55 STATIC void
  56 xfs_qm_dquot_logitem_format(
  57         struct xfs_log_item     *lip,
  58         struct xfs_log_vec      *lv)
  59 {
  60         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
  61         struct xfs_log_iovec    *vecp = NULL;
  62         struct xfs_dq_logformat *qlf;
  63
  64         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
  65         qlf->qlf_type = XFS_LI_DQUOT;
  66         qlf->qlf_size = 2;
  67         qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
  68         qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
  69         qlf->qlf_len = 1;
  70         qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
  71         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
  72
  73         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
  74                         &qlip->qli_dquot->q_core,
  75                         sizeof(struct xfs_disk_dquot));
  76 }
  77
  78 /*
  79  * Increment the pin count of the given dquot.
  80  */
  81 STATIC void
  82 xfs_qm_dquot_logitem_pin(
  83         struct xfs_log_item     *lip)
  84 {
  85         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
  86
  87         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  88         atomic_inc(&dqp->q_pincount);
  89 }
  90
  91 /*
  92  * Decrement the pin count of the given dquot, and wake up
  93  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
  94  * dquot must have been previously pinned with a call to
  95  * xfs_qm_dquot_logitem_pin().
  96  */
  97 STATIC void
  98 xfs_qm_dquot_logitem_unpin(
  99         struct xfs_log_item     *lip,
 100         int                     remove)
 101 {
 102         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 103
 104         ASSERT(atomic_read(&dqp->q_pincount) > 0);
 105         if (atomic_dec_and_test(&dqp->q_pincount))
 106                 wake_up(&dqp->q_pinwait);
 107 }
 108
 109 STATIC xfs_lsn_t
 110 xfs_qm_dquot_logitem_committed(
 111         struct xfs_log_item     *lip,
 112         xfs_lsn_t               lsn)
 113 {
 114         /*
 115          * We always re-log the entire dquot when it becomes dirty,
 116          * so, the latest copy _is_ the only one that matters.
 117          */
 118         return lsn;
 119 }
 120
 121 /*
 122  * This is called to wait for the given dquot to be unpinned.
 123  * Most of these pin/unpin routines are plagiarized from inode code.
 124  */
 125 void
 126 xfs_qm_dqunpin_wait(
 127         struct xfs_dquot        *dqp)
 128 {
 129         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 130         if (atomic_read(&dqp->q_pincount) == 0)
 131                 return;
 132
 133         /*
 134          * Give the log a push so we don't wait here too long.
 135          */
 136         xfs_log_force(dqp->q_mount, 0);
 137         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 138 }
 139
 140 /*
 141  * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
 142  * have been failed during writeback
 143  *
 144  * this informs the AIL that the dquot is already flush locked on the next push,
 145  * and acquires a hold on the buffer to ensure that it isn't reclaimed before
 146  * dirty data makes it to disk.
 147  */
 148 STATIC void
 149 xfs_dquot_item_error(
 150         struct xfs_log_item     *lip,
 151         struct xfs_buf          *bp)
 152 {
 153         ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush));
 154         xfs_set_li_failed(lip, bp);
 155 }
 156
 157 STATIC uint
 158 xfs_qm_dquot_logitem_push(
 159         struct xfs_log_item     *lip,
 160         struct list_head        *buffer_list)
 161                 __releases(&lip->li_ailp->ail_lock)
 162                 __acquires(&lip->li_ailp->ail_lock)
 163 {
 164         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 165         struct xfs_buf          *bp = lip->li_buf;
 166         uint                    rval = XFS_ITEM_SUCCESS;
 167         int                     error;
 168
 169         if (atomic_read(&dqp->q_pincount) > 0)
 170                 return XFS_ITEM_PINNED;
 171
 172         /*
 173          * The buffer containing this item failed to be written back
 174          * previously. Resubmit the buffer for IO
 175          */
 176         if (test_bit(XFS_LI_FAILED, &lip->li_flags)) {
 177                 if (!xfs_buf_trylock(bp))
 178                         return XFS_ITEM_LOCKED;
 179
 180                 if (!xfs_buf_resubmit_failed_buffers(bp, buffer_list))
 181                         rval = XFS_ITEM_FLUSHING;
 182
 183                 xfs_buf_unlock(bp);
 184                 return rval;
 185         }
 186
 187         if (!xfs_dqlock_nowait(dqp))
 188                 return XFS_ITEM_LOCKED;
 189
 190         /*
 191          * Re-check the pincount now that we stabilized the value by
 192          * taking the quota lock.
 193          */
 194         if (atomic_read(&dqp->q_pincount) > 0) {
 195                 rval = XFS_ITEM_PINNED;
 196                 goto out_unlock;
 197         }
 198
 199         /*
 200          * Someone else is already flushing the dquot.  Nothing we can do
 201          * here but wait for the flush to finish and remove the item from
 202          * the AIL.
 203          */
 204         if (!xfs_dqflock_nowait(dqp)) {
 205                 rval = XFS_ITEM_FLUSHING;
 206                 goto out_unlock;
 207         }
 208
 209         spin_unlock(&lip->li_ailp->ail_lock);
 210
 211         error = xfs_qm_dqflush(dqp, &bp);
 212         if (!error) {
 213                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 214                         rval = XFS_ITEM_FLUSHING;
 215                 xfs_buf_relse(bp);
 216         }
 217
 218         spin_lock(&lip->li_ailp->ail_lock);
 219 out_unlock:
 220         xfs_dqunlock(dqp);
 221         return rval;
 222 }
 223
 224 /*
 225  * Unlock the dquot associated with the log item.
 226  * Clear the fields of the dquot and dquot log item that
 227  * are specific to the current transaction.  If the
 228  * hold flags is set, do not unlock the dquot.
 229  */
 230 STATIC void
 231 xfs_qm_dquot_logitem_unlock(
 232         struct xfs_log_item     *lip)
 233 {
 234         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 235
 236         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 237
 238         /*
 239          * Clear the transaction pointer in the dquot
 240          */
 241         dqp->q_transp = NULL;
 242
 243         /*
 244          * dquots are never 'held' from getting unlocked at the end of
 245          * a transaction.  Their locking and unlocking is hidden inside the
 246          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 247          * for the logitem.
 248          */
 249         xfs_dqunlock(dqp);
 250 }
 251
 252 /*
 253  * this needs to stamp an lsn into the dquot, I think.
 254  * rpc's that look at user dquot's would then have to
 255  * push on the dependency recorded in the dquot
 256  */
 257 STATIC void
 258 xfs_qm_dquot_logitem_committing(
 259         struct xfs_log_item     *lip,
 260         xfs_lsn_t               lsn)
 261 {
 262 }
 263
 264 /*
 265  * This is the ops vector for dquots
 266  */
 267 static const struct xfs_item_ops xfs_dquot_item_ops = {
 268         .iop_size       = xfs_qm_dquot_logitem_size,
 269         .iop_format     = xfs_qm_dquot_logitem_format,
 270         .iop_pin        = xfs_qm_dquot_logitem_pin,
 271         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 272         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
 273         .iop_committed  = xfs_qm_dquot_logitem_committed,
 274         .iop_push       = xfs_qm_dquot_logitem_push,
 275         .iop_committing = xfs_qm_dquot_logitem_committing,
 276         .iop_error      = xfs_dquot_item_error
 277 };
 278
 279 /*
 280  * Initialize the dquot log item for a newly allocated dquot.
 281  * The dquot isn't locked at this point, but it isn't on any of the lists
 282  * either, so we don't care.
 283  */
 284 void
 285 xfs_qm_dquot_logitem_init(
 286         struct xfs_dquot        *dqp)
 287 {
 288         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 289
 290         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 291                                         &xfs_dquot_item_ops);
 292         lp->qli_dquot = dqp;
 293 }
 294
 295 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 296
 297 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 298 {
 299         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 300 }
 301
 302
 303 /*
 304  * This returns the number of iovecs needed to log the given quotaoff item.
 305  * We only need 1 iovec for an quotaoff item.  It just logs the
 306  * quotaoff_log_format structure.
 307  */
 308 STATIC void
 309 xfs_qm_qoff_logitem_size(
 310         struct xfs_log_item     *lip,
 311         int                     *nvecs,
 312         int                     *nbytes)
 313 {
 314         *nvecs += 1;
 315         *nbytes += sizeof(struct xfs_qoff_logitem);
 316 }
 317
 318 STATIC void
 319 xfs_qm_qoff_logitem_format(
 320         struct xfs_log_item     *lip,
 321         struct xfs_log_vec      *lv)
 322 {
 323         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 324         struct xfs_log_iovec    *vecp = NULL;
 325         struct xfs_qoff_logformat *qlf;
 326
 327         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
 328         qlf->qf_type = XFS_LI_QUOTAOFF;
 329         qlf->qf_size = 1;
 330         qlf->qf_flags = qflip->qql_flags;
 331         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
 332 }
 333
 334 /*
 335  * Pinning has no meaning for an quotaoff item, so just return.
 336  */
 337 STATIC void
 338 xfs_qm_qoff_logitem_pin(
 339         struct xfs_log_item     *lip)
 340 {
 341 }
 342
 343 /*
 344  * Since pinning has no meaning for an quotaoff item, unpinning does
 345  * not either.
 346  */
 347 STATIC void
 348 xfs_qm_qoff_logitem_unpin(
 349         struct xfs_log_item     *lip,
 350         int                     remove)
 351 {
 352 }
 353
 354 /*
 355  * There isn't much you can do to push a quotaoff item.  It is simply
 356  * stuck waiting for the log to be flushed to disk.
 357  */
 358 STATIC uint
 359 xfs_qm_qoff_logitem_push(
 360         struct xfs_log_item     *lip,
 361         struct list_head        *buffer_list)
 362 {
 363         return XFS_ITEM_LOCKED;
 364 }
 365
 366 /*
 367  * Quotaoff items have no locking or pushing, so return failure
 368  * so that the caller doesn't bother with us.
 369  */
 370 STATIC void
 371 xfs_qm_qoff_logitem_unlock(
 372         struct xfs_log_item     *lip)
 373 {
 374 }
 375
 376 /*
 377  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 378  * so simply return the lsn at which it's been logged.
 379  */
 380 STATIC xfs_lsn_t
 381 xfs_qm_qoff_logitem_committed(
 382         struct xfs_log_item     *lip,
 383         xfs_lsn_t               lsn)
 384 {
 385         return lsn;
 386 }
 387
 388 STATIC xfs_lsn_t
 389 xfs_qm_qoffend_logitem_committed(
 390         struct xfs_log_item     *lip,
 391         xfs_lsn_t               lsn)
 392 {
 393         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 394         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 395         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 396
 397         /*
 398          * Delete the qoff-start logitem from the AIL.
 399          * xfs_trans_ail_delete() drops the AIL lock.
 400          */
 401         spin_lock(&ailp->ail_lock);
 402         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
 403
 404         kmem_free(qfs->qql_item.li_lv_shadow);
 405         kmem_free(lip->li_lv_shadow);
 406         kmem_free(qfs);
 407         kmem_free(qfe);
 408         return (xfs_lsn_t)-1;
 409 }
 410
 411 /*
 412  * XXX rcc - don't know quite what to do with this.  I think we can
 413  * just ignore it.  The only time that isn't the case is if we allow
 414  * the client to somehow see that quotas have been turned off in which
 415  * we can't allow that to get back until the quotaoff hits the disk.
 416  * So how would that happen?  Also, do we need different routines for
 417  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 418  * to be sure, I need to look at the recovery code and see how quota off
 419  * recovery is handled (do we roll forward or back or do something else).
 420  * If we roll forwards or backwards, then we need two separate routines,
 421  * one that does nothing and one that stamps in the lsn that matters
 422  * (truly makes the quotaoff irrevocable).  If we do something else,
 423  * then maybe we don't need two.
 424  */
 425 STATIC void
 426 xfs_qm_qoff_logitem_committing(
 427         struct xfs_log_item     *lip,
 428         xfs_lsn_t               commit_lsn)
 429 {
 430 }
 431
 432 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 433         .iop_size       = xfs_qm_qoff_logitem_size,
 434         .iop_format     = xfs_qm_qoff_logitem_format,
 435         .iop_pin        = xfs_qm_qoff_logitem_pin,
 436         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 437         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 438         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 439         .iop_push       = xfs_qm_qoff_logitem_push,
 440         .iop_committing = xfs_qm_qoff_logitem_committing
 441 };
 442
 443 /*
 444  * This is the ops vector shared by all quotaoff-start log items.
 445  */
 446 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 447         .iop_size       = xfs_qm_qoff_logitem_size,
 448         .iop_format     = xfs_qm_qoff_logitem_format,
 449         .iop_pin        = xfs_qm_qoff_logitem_pin,
 450         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 451         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 452         .iop_committed  = xfs_qm_qoff_logitem_committed,
 453         .iop_push       = xfs_qm_qoff_logitem_push,
 454         .iop_committing = xfs_qm_qoff_logitem_committing
 455 };
 456
 457 /*
 458  * Allocate and initialize an quotaoff item of the correct quota type(s).
 459  */
 460 struct xfs_qoff_logitem *
 461 xfs_qm_qoff_logitem_init(
 462         struct xfs_mount        *mp,
 463         struct xfs_qoff_logitem *start,
 464         uint                    flags)
 465 {
 466         struct xfs_qoff_logitem *qf;
 467
 468         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
 469
 470         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 471                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 472         qf->qql_item.li_mountp = mp;
 473         qf->qql_start_lip = start;
 474         qf->qql_flags = flags;
 475         return qf;
 476 }