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