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