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