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