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_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_alloc.h"
  27 #include "xfs_quota.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_bmap.h"
  32 #include "xfs_rtalloc.h"
  33 #include "xfs_error.h"
  34 #include "xfs_itable.h"
  35 #include "xfs_attr.h"
  36 #include "xfs_buf_item.h"
  37 #include "xfs_trans_priv.h"
  38 #include "xfs_qm.h"
  39
  40 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
  41 {
  42         return container_of(lip, struct xfs_dq_logitem, qli_item);
  43 }
  44
  45 /*
  46  * returns the number of iovecs needed to log the given dquot item.
  47  */
  48 STATIC uint
  49 xfs_qm_dquot_logitem_size(
  50         struct xfs_log_item     *lip)
  51 {
  52         /*
  53          * we need only two iovecs, one for the format, one for the real thing
  54          */
  55         return 2;
  56 }
  57
  58 /*
  59  * fills in the vector of log iovecs for the given dquot log item.
  60  */
  61 STATIC void
  62 xfs_qm_dquot_logitem_format(
  63         struct xfs_log_item     *lip,
  64         struct xfs_log_iovec    *logvec)
  65 {
  66         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
  67
  68         logvec->i_addr = &qlip->qli_format;
  69         logvec->i_len  = sizeof(xfs_dq_logformat_t);
  70         logvec->i_type = XLOG_REG_TYPE_QFORMAT;
  71         logvec++;
  72         logvec->i_addr = &qlip->qli_dquot->q_core;
  73         logvec->i_len  = sizeof(xfs_disk_dquot_t);
  74         logvec->i_type = XLOG_REG_TYPE_DQUOT;
  75
  76         qlip->qli_format.qlf_size = 2;
  77
  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 /*
 112  * Given the logitem, this writes the corresponding dquot entry to disk
 113  * asynchronously. This is called with the dquot entry securely locked;
 114  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 115  * at the end.
 116  */
 117 STATIC void
 118 xfs_qm_dquot_logitem_push(
 119         struct xfs_log_item     *lip)
 120 {
 121         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 122         int                     error;
 123
 124         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 125         ASSERT(!completion_done(&dqp->q_flush));
 126
 127         /*
 128          * Since we were able to lock the dquot's flush lock and
 129          * we found it on the AIL, the dquot must be dirty.  This
 130          * is because the dquot is removed from the AIL while still
 131          * holding the flush lock in xfs_dqflush_done().  Thus, if
 132          * we found it in the AIL and were able to obtain the flush
 133          * lock without sleeping, then there must not have been
 134          * anyone in the process of flushing the dquot.
 135          */
 136         error = xfs_qm_dqflush(dqp, SYNC_TRYLOCK);
 137         if (error)
 138                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
 139                         __func__, error, dqp);
 140         xfs_dqunlock(dqp);
 141 }
 142
 143 STATIC xfs_lsn_t
 144 xfs_qm_dquot_logitem_committed(
 145         struct xfs_log_item     *lip,
 146         xfs_lsn_t               lsn)
 147 {
 148         /*
 149          * We always re-log the entire dquot when it becomes dirty,
 150          * so, the latest copy _is_ the only one that matters.
 151          */
 152         return lsn;
 153 }
 154
 155 /*
 156  * This is called to wait for the given dquot to be unpinned.
 157  * Most of these pin/unpin routines are plagiarized from inode code.
 158  */
 159 void
 160 xfs_qm_dqunpin_wait(
 161         struct xfs_dquot        *dqp)
 162 {
 163         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 164         if (atomic_read(&dqp->q_pincount) == 0)
 165                 return;
 166
 167         /*
 168          * Give the log a push so we don't wait here too long.
 169          */
 170         xfs_log_force(dqp->q_mount, 0);
 171         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 172 }
 173
 174 /*
 175  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 176  * the dquot is locked by us, but the flush lock isn't. So, here we are
 177  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 178  * If so, we want to push it out to help us take this item off the AIL as soon
 179  * as possible.
 180  *
 181  * We must not be holding the AIL lock at this point. Calling incore() to
 182  * search the buffer cache can be a time consuming thing, and AIL lock is a
 183  * spinlock.
 184  */
 185 STATIC bool
 186 xfs_qm_dquot_logitem_pushbuf(
 187         struct xfs_log_item     *lip)
 188 {
 189         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
 190         struct xfs_dquot        *dqp = qlip->qli_dquot;
 191         struct xfs_buf          *bp;
 192         bool                    ret = true;
 193
 194         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 195
 196         /*
 197          * If flushlock isn't locked anymore, chances are that the
 198          * inode flush completed and the inode was taken off the AIL.
 199          * So, just get out.
 200          */
 201         if (completion_done(&dqp->q_flush) ||
 202             !(lip->li_flags & XFS_LI_IN_AIL)) {
 203                 xfs_dqunlock(dqp);
 204                 return true;
 205         }
 206
 207         bp = xfs_incore(dqp->q_mount->m_ddev_targp, qlip->qli_format.qlf_blkno,
 208                         dqp->q_mount->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
 209         xfs_dqunlock(dqp);
 210         if (!bp)
 211                 return true;
 212         if (XFS_BUF_ISDELAYWRITE(bp))
 213                 xfs_buf_delwri_promote(bp);
 214         if (xfs_buf_ispinned(bp))
 215                 ret = false;
 216         xfs_buf_relse(bp);
 217         return ret;
 218 }
 219
 220 /*
 221  * This is called to attempt to lock the dquot associated with this
 222  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 223  * If the flush lock is already held, indicating that the dquot has
 224  * been or is in the process of being flushed, then see if we can
 225  * find the dquot's buffer in the buffer cache without sleeping.  If
 226  * we can and it is marked delayed write, then we want to send it out.
 227  * We delay doing so until the push routine, though, to avoid sleeping
 228  * in any device strategy routines.
 229  */
 230 STATIC uint
 231 xfs_qm_dquot_logitem_trylock(
 232         struct xfs_log_item     *lip)
 233 {
 234         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 235
 236         if (atomic_read(&dqp->q_pincount) > 0)
 237                 return XFS_ITEM_PINNED;
 238
 239         if (!xfs_dqlock_nowait(dqp))
 240                 return XFS_ITEM_LOCKED;
 241
 242         if (!xfs_dqflock_nowait(dqp)) {
 243                 /*
 244                  * dquot has already been flushed to the backing buffer,
 245                  * leave it locked, pushbuf routine will unlock it.
 246                  */
 247                 return XFS_ITEM_PUSHBUF;
 248         }
 249
 250         ASSERT(lip->li_flags & XFS_LI_IN_AIL);
 251         return XFS_ITEM_SUCCESS;
 252 }
 253
 254 /*
 255  * Unlock the dquot associated with the log item.
 256  * Clear the fields of the dquot and dquot log item that
 257  * are specific to the current transaction.  If the
 258  * hold flags is set, do not unlock the dquot.
 259  */
 260 STATIC void
 261 xfs_qm_dquot_logitem_unlock(
 262         struct xfs_log_item     *lip)
 263 {
 264         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 265
 266         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 267
 268         /*
 269          * Clear the transaction pointer in the dquot
 270          */
 271         dqp->q_transp = NULL;
 272
 273         /*
 274          * dquots are never 'held' from getting unlocked at the end of
 275          * a transaction.  Their locking and unlocking is hidden inside the
 276          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 277          * for the logitem.
 278          */
 279         xfs_dqunlock(dqp);
 280 }
 281
 282 /*
 283  * this needs to stamp an lsn into the dquot, I think.
 284  * rpc's that look at user dquot's would then have to
 285  * push on the dependency recorded in the dquot
 286  */
 287 STATIC void
 288 xfs_qm_dquot_logitem_committing(
 289         struct xfs_log_item     *lip,
 290         xfs_lsn_t               lsn)
 291 {
 292 }
 293
 294 /*
 295  * This is the ops vector for dquots
 296  */
 297 static const struct xfs_item_ops xfs_dquot_item_ops = {
 298         .iop_size       = xfs_qm_dquot_logitem_size,
 299         .iop_format     = xfs_qm_dquot_logitem_format,
 300         .iop_pin        = xfs_qm_dquot_logitem_pin,
 301         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 302         .iop_trylock    = xfs_qm_dquot_logitem_trylock,
 303         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
 304         .iop_committed  = xfs_qm_dquot_logitem_committed,
 305         .iop_push       = xfs_qm_dquot_logitem_push,
 306         .iop_pushbuf    = xfs_qm_dquot_logitem_pushbuf,
 307         .iop_committing = xfs_qm_dquot_logitem_committing
 308 };
 309
 310 /*
 311  * Initialize the dquot log item for a newly allocated dquot.
 312  * The dquot isn't locked at this point, but it isn't on any of the lists
 313  * either, so we don't care.
 314  */
 315 void
 316 xfs_qm_dquot_logitem_init(
 317         struct xfs_dquot        *dqp)
 318 {
 319         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 320
 321         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 322                                         &xfs_dquot_item_ops);
 323         lp->qli_dquot = dqp;
 324         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 325         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
 326         lp->qli_format.qlf_blkno = dqp->q_blkno;
 327         lp->qli_format.qlf_len = 1;
 328         /*
 329          * This is just the offset of this dquot within its buffer
 330          * (which is currently 1 FSB and probably won't change).
 331          * Hence 32 bits for this offset should be just fine.
 332          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 333          * here, and recompute it at recovery time.
 334          */
 335         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 336 }
 337
 338 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 339
 340 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 341 {
 342         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 343 }
 344
 345
 346 /*
 347  * This returns the number of iovecs needed to log the given quotaoff item.
 348  * We only need 1 iovec for an quotaoff item.  It just logs the
 349  * quotaoff_log_format structure.
 350  */
 351 STATIC uint
 352 xfs_qm_qoff_logitem_size(
 353         struct xfs_log_item     *lip)
 354 {
 355         return 1;
 356 }
 357
 358 /*
 359  * This is called to fill in the vector of log iovecs for the
 360  * given quotaoff log item. We use only 1 iovec, and we point that
 361  * at the quotaoff_log_format structure embedded in the quotaoff item.
 362  * It is at this point that we assert that all of the extent
 363  * slots in the quotaoff item have been filled.
 364  */
 365 STATIC void
 366 xfs_qm_qoff_logitem_format(
 367         struct xfs_log_item     *lip,
 368         struct xfs_log_iovec    *log_vector)
 369 {
 370         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 371
 372         ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
 373
 374         log_vector->i_addr = &qflip->qql_format;
 375         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 376         log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
 377         qflip->qql_format.qf_size = 1;
 378 }
 379
 380 /*
 381  * Pinning has no meaning for an quotaoff item, so just return.
 382  */
 383 STATIC void
 384 xfs_qm_qoff_logitem_pin(
 385         struct xfs_log_item     *lip)
 386 {
 387 }
 388
 389 /*
 390  * Since pinning has no meaning for an quotaoff item, unpinning does
 391  * not either.
 392  */
 393 STATIC void
 394 xfs_qm_qoff_logitem_unpin(
 395         struct xfs_log_item     *lip,
 396         int                     remove)
 397 {
 398 }
 399
 400 /*
 401  * Quotaoff items have no locking, so just return success.
 402  */
 403 STATIC uint
 404 xfs_qm_qoff_logitem_trylock(
 405         struct xfs_log_item     *lip)
 406 {
 407         return XFS_ITEM_LOCKED;
 408 }
 409
 410 /*
 411  * Quotaoff items have no locking or pushing, so return failure
 412  * so that the caller doesn't bother with us.
 413  */
 414 STATIC void
 415 xfs_qm_qoff_logitem_unlock(
 416         struct xfs_log_item     *lip)
 417 {
 418 }
 419
 420 /*
 421  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 422  * so simply return the lsn at which it's been logged.
 423  */
 424 STATIC xfs_lsn_t
 425 xfs_qm_qoff_logitem_committed(
 426         struct xfs_log_item     *lip,
 427         xfs_lsn_t               lsn)
 428 {
 429         return lsn;
 430 }
 431
 432 /*
 433  * There isn't much you can do to push on an quotaoff item.  It is simply
 434  * stuck waiting for the log to be flushed to disk.
 435  */
 436 STATIC void
 437 xfs_qm_qoff_logitem_push(
 438         struct xfs_log_item     *lip)
 439 {
 440 }
 441
 442
 443 STATIC xfs_lsn_t
 444 xfs_qm_qoffend_logitem_committed(
 445         struct xfs_log_item     *lip,
 446         xfs_lsn_t               lsn)
 447 {
 448         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 449         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 450         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 451
 452         /*
 453          * Delete the qoff-start logitem from the AIL.
 454          * xfs_trans_ail_delete() drops the AIL lock.
 455          */
 456         spin_lock(&ailp->xa_lock);
 457         xfs_trans_ail_delete(ailp, (xfs_log_item_t *)qfs);
 458
 459         kmem_free(qfs);
 460         kmem_free(qfe);
 461         return (xfs_lsn_t)-1;
 462 }
 463
 464 /*
 465  * XXX rcc - don't know quite what to do with this.  I think we can
 466  * just ignore it.  The only time that isn't the case is if we allow
 467  * the client to somehow see that quotas have been turned off in which
 468  * we can't allow that to get back until the quotaoff hits the disk.
 469  * So how would that happen?  Also, do we need different routines for
 470  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 471  * to be sure, I need to look at the recovery code and see how quota off
 472  * recovery is handled (do we roll forward or back or do something else).
 473  * If we roll forwards or backwards, then we need two separate routines,
 474  * one that does nothing and one that stamps in the lsn that matters
 475  * (truly makes the quotaoff irrevocable).  If we do something else,
 476  * then maybe we don't need two.
 477  */
 478 STATIC void
 479 xfs_qm_qoff_logitem_committing(
 480         struct xfs_log_item     *lip,
 481         xfs_lsn_t               commit_lsn)
 482 {
 483 }
 484
 485 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 486         .iop_size       = xfs_qm_qoff_logitem_size,
 487         .iop_format     = xfs_qm_qoff_logitem_format,
 488         .iop_pin        = xfs_qm_qoff_logitem_pin,
 489         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 490         .iop_trylock    = xfs_qm_qoff_logitem_trylock,
 491         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 492         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 493         .iop_push       = xfs_qm_qoff_logitem_push,
 494         .iop_committing = xfs_qm_qoff_logitem_committing
 495 };
 496
 497 /*
 498  * This is the ops vector shared by all quotaoff-start log items.
 499  */
 500 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 501         .iop_size       = xfs_qm_qoff_logitem_size,
 502         .iop_format     = xfs_qm_qoff_logitem_format,
 503         .iop_pin        = xfs_qm_qoff_logitem_pin,
 504         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 505         .iop_trylock    = xfs_qm_qoff_logitem_trylock,
 506         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 507         .iop_committed  = xfs_qm_qoff_logitem_committed,
 508         .iop_push       = xfs_qm_qoff_logitem_push,
 509         .iop_committing = xfs_qm_qoff_logitem_committing
 510 };
 511
 512 /*
 513  * Allocate and initialize an quotaoff item of the correct quota type(s).
 514  */
 515 struct xfs_qoff_logitem *
 516 xfs_qm_qoff_logitem_init(
 517         struct xfs_mount        *mp,
 518         struct xfs_qoff_logitem *start,
 519         uint                    flags)
 520 {
 521         struct xfs_qoff_logitem *qf;
 522
 523         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
 524
 525         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 526                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 527         qf->qql_item.li_mountp = mp;
 528         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 529         qf->qql_format.qf_flags = flags;
 530         qf->qql_start_lip = start;
 531         return qf;
 532 }