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         struct xfs_dquot        *dqp;
 154
 155         dqp = DQUOT_ITEM(lip)->qli_dquot;
 156         ASSERT(!completion_done(&dqp->q_flush));
 157         xfs_set_li_failed(lip, bp);
 158 }
 159
 160 STATIC uint
 161 xfs_qm_dquot_logitem_push(
 162         struct xfs_log_item     *lip,
 163         struct list_head        *buffer_list) __releases(&lip->li_ailp->xa_lock)
 164                                               __acquires(&lip->li_ailp->xa_lock)
 165 {
 166         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 167         struct xfs_buf          *bp = lip->li_buf;
 168         uint                    rval = XFS_ITEM_SUCCESS;
 169         int                     error;
 170
 171         if (atomic_read(&dqp->q_pincount) > 0)
 172                 return XFS_ITEM_PINNED;
 173
 174         /*
 175          * The buffer containing this item failed to be written back
 176          * previously. Resubmit the buffer for IO
 177          */
 178         if (lip->li_flags & XFS_LI_FAILED) {
 179                 if (!xfs_buf_trylock(bp))
 180                         return XFS_ITEM_LOCKED;
 181
 182                 if (!xfs_buf_resubmit_failed_buffers(bp, lip, buffer_list))
 183                         rval = XFS_ITEM_FLUSHING;
 184
 185                 xfs_buf_unlock(bp);
 186                 return rval;
 187         }
 188
 189         if (!xfs_dqlock_nowait(dqp))
 190                 return XFS_ITEM_LOCKED;
 191
 192         /*
 193          * Re-check the pincount now that we stabilized the value by
 194          * taking the quota lock.
 195          */
 196         if (atomic_read(&dqp->q_pincount) > 0) {
 197                 rval = XFS_ITEM_PINNED;
 198                 goto out_unlock;
 199         }
 200
 201         /*
 202          * Someone else is already flushing the dquot.  Nothing we can do
 203          * here but wait for the flush to finish and remove the item from
 204          * the AIL.
 205          */
 206         if (!xfs_dqflock_nowait(dqp)) {
 207                 rval = XFS_ITEM_FLUSHING;
 208                 goto out_unlock;
 209         }
 210
 211         spin_unlock(&lip->li_ailp->xa_lock);
 212
 213         error = xfs_qm_dqflush(dqp, &bp);
 214         if (error) {
 215                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
 216                         __func__, error, dqp);
 217         } else {
 218                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 219                         rval = XFS_ITEM_FLUSHING;
 220                 xfs_buf_relse(bp);
 221         }
 222
 223         spin_lock(&lip->li_ailp->xa_lock);
 224 out_unlock:
 225         xfs_dqunlock(dqp);
 226         return rval;
 227 }
 228
 229 /*
 230  * Unlock the dquot associated with the log item.
 231  * Clear the fields of the dquot and dquot log item that
 232  * are specific to the current transaction.  If the
 233  * hold flags is set, do not unlock the dquot.
 234  */
 235 STATIC void
 236 xfs_qm_dquot_logitem_unlock(
 237         struct xfs_log_item     *lip)
 238 {
 239         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 240
 241         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 242
 243         /*
 244          * Clear the transaction pointer in the dquot
 245          */
 246         dqp->q_transp = NULL;
 247
 248         /*
 249          * dquots are never 'held' from getting unlocked at the end of
 250          * a transaction.  Their locking and unlocking is hidden inside the
 251          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 252          * for the logitem.
 253          */
 254         xfs_dqunlock(dqp);
 255 }
 256
 257 /*
 258  * this needs to stamp an lsn into the dquot, I think.
 259  * rpc's that look at user dquot's would then have to
 260  * push on the dependency recorded in the dquot
 261  */
 262 STATIC void
 263 xfs_qm_dquot_logitem_committing(
 264         struct xfs_log_item     *lip,
 265         xfs_lsn_t               lsn)
 266 {
 267 }
 268
 269 /*
 270  * This is the ops vector for dquots
 271  */
 272 static const struct xfs_item_ops xfs_dquot_item_ops = {
 273         .iop_size       = xfs_qm_dquot_logitem_size,
 274         .iop_format     = xfs_qm_dquot_logitem_format,
 275         .iop_pin        = xfs_qm_dquot_logitem_pin,
 276         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 277         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
 278         .iop_committed  = xfs_qm_dquot_logitem_committed,
 279         .iop_push       = xfs_qm_dquot_logitem_push,
 280         .iop_committing = xfs_qm_dquot_logitem_committing,
 281         .iop_error      = xfs_dquot_item_error
 282 };
 283
 284 /*
 285  * Initialize the dquot log item for a newly allocated dquot.
 286  * The dquot isn't locked at this point, but it isn't on any of the lists
 287  * either, so we don't care.
 288  */
 289 void
 290 xfs_qm_dquot_logitem_init(
 291         struct xfs_dquot        *dqp)
 292 {
 293         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 294
 295         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 296                                         &xfs_dquot_item_ops);
 297         lp->qli_dquot = dqp;
 298 }
 299
 300 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 301
 302 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 303 {
 304         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 305 }
 306
 307
 308 /*
 309  * This returns the number of iovecs needed to log the given quotaoff item.
 310  * We only need 1 iovec for an quotaoff item.  It just logs the
 311  * quotaoff_log_format structure.
 312  */
 313 STATIC void
 314 xfs_qm_qoff_logitem_size(
 315         struct xfs_log_item     *lip,
 316         int                     *nvecs,
 317         int                     *nbytes)
 318 {
 319         *nvecs += 1;
 320         *nbytes += sizeof(struct xfs_qoff_logitem);
 321 }
 322
 323 STATIC void
 324 xfs_qm_qoff_logitem_format(
 325         struct xfs_log_item     *lip,
 326         struct xfs_log_vec      *lv)
 327 {
 328         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 329         struct xfs_log_iovec    *vecp = NULL;
 330         struct xfs_qoff_logformat *qlf;
 331
 332         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
 333         qlf->qf_type = XFS_LI_QUOTAOFF;
 334         qlf->qf_size = 1;
 335         qlf->qf_flags = qflip->qql_flags;
 336         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
 337 }
 338
 339 /*
 340  * Pinning has no meaning for an quotaoff item, so just return.
 341  */
 342 STATIC void
 343 xfs_qm_qoff_logitem_pin(
 344         struct xfs_log_item     *lip)
 345 {
 346 }
 347
 348 /*
 349  * Since pinning has no meaning for an quotaoff item, unpinning does
 350  * not either.
 351  */
 352 STATIC void
 353 xfs_qm_qoff_logitem_unpin(
 354         struct xfs_log_item     *lip,
 355         int                     remove)
 356 {
 357 }
 358
 359 /*
 360  * There isn't much you can do to push a quotaoff item.  It is simply
 361  * stuck waiting for the log to be flushed to disk.
 362  */
 363 STATIC uint
 364 xfs_qm_qoff_logitem_push(
 365         struct xfs_log_item     *lip,
 366         struct list_head        *buffer_list)
 367 {
 368         return XFS_ITEM_LOCKED;
 369 }
 370
 371 /*
 372  * Quotaoff items have no locking or pushing, so return failure
 373  * so that the caller doesn't bother with us.
 374  */
 375 STATIC void
 376 xfs_qm_qoff_logitem_unlock(
 377         struct xfs_log_item     *lip)
 378 {
 379 }
 380
 381 /*
 382  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 383  * so simply return the lsn at which it's been logged.
 384  */
 385 STATIC xfs_lsn_t
 386 xfs_qm_qoff_logitem_committed(
 387         struct xfs_log_item     *lip,
 388         xfs_lsn_t               lsn)
 389 {
 390         return lsn;
 391 }
 392
 393 STATIC xfs_lsn_t
 394 xfs_qm_qoffend_logitem_committed(
 395         struct xfs_log_item     *lip,
 396         xfs_lsn_t               lsn)
 397 {
 398         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 399         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 400         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 401
 402         /*
 403          * Delete the qoff-start logitem from the AIL.
 404          * xfs_trans_ail_delete() drops the AIL lock.
 405          */
 406         spin_lock(&ailp->xa_lock);
 407         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
 408
 409         kmem_free(qfs->qql_item.li_lv_shadow);
 410         kmem_free(lip->li_lv_shadow);
 411         kmem_free(qfs);
 412         kmem_free(qfe);
 413         return (xfs_lsn_t)-1;
 414 }
 415
 416 /*
 417  * XXX rcc - don't know quite what to do with this.  I think we can
 418  * just ignore it.  The only time that isn't the case is if we allow
 419  * the client to somehow see that quotas have been turned off in which
 420  * we can't allow that to get back until the quotaoff hits the disk.
 421  * So how would that happen?  Also, do we need different routines for
 422  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 423  * to be sure, I need to look at the recovery code and see how quota off
 424  * recovery is handled (do we roll forward or back or do something else).
 425  * If we roll forwards or backwards, then we need two separate routines,
 426  * one that does nothing and one that stamps in the lsn that matters
 427  * (truly makes the quotaoff irrevocable).  If we do something else,
 428  * then maybe we don't need two.
 429  */
 430 STATIC void
 431 xfs_qm_qoff_logitem_committing(
 432         struct xfs_log_item     *lip,
 433         xfs_lsn_t               commit_lsn)
 434 {
 435 }
 436
 437 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 438         .iop_size       = xfs_qm_qoff_logitem_size,
 439         .iop_format     = xfs_qm_qoff_logitem_format,
 440         .iop_pin        = xfs_qm_qoff_logitem_pin,
 441         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 442         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 443         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 444         .iop_push       = xfs_qm_qoff_logitem_push,
 445         .iop_committing = xfs_qm_qoff_logitem_committing
 446 };
 447
 448 /*
 449  * This is the ops vector shared by all quotaoff-start log items.
 450  */
 451 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 452         .iop_size       = xfs_qm_qoff_logitem_size,
 453         .iop_format     = xfs_qm_qoff_logitem_format,
 454         .iop_pin        = xfs_qm_qoff_logitem_pin,
 455         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 456         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 457         .iop_committed  = xfs_qm_qoff_logitem_committed,
 458         .iop_push       = xfs_qm_qoff_logitem_push,
 459         .iop_committing = xfs_qm_qoff_logitem_committing
 460 };
 461
 462 /*
 463  * Allocate and initialize an quotaoff item of the correct quota type(s).
 464  */
 465 struct xfs_qoff_logitem *
 466 xfs_qm_qoff_logitem_init(
 467         struct xfs_mount        *mp,
 468         struct xfs_qoff_logitem *start,
 469         uint                    flags)
 470 {
 471         struct xfs_qoff_logitem *qf;
 472
 473         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
 474
 475         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 476                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 477         qf->qql_item.li_mountp = mp;
 478         qf->qql_start_lip = start;
 479         qf->qql_flags = flags;
 480         return qf;
 481 }