fs/xfs/xfs_extfree_item.c

   1 /*
   2  * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 /*
  34  * This file contains the implementation of the xfs_efi_log_item
  35  * and xfs_efd_log_item items.
  36  */
  37
  38 #include "xfs.h"
  39
  40 #include "xfs_macros.h"
  41 #include "xfs_types.h"
  42 #include "xfs_inum.h"
  43 #include "xfs_log.h"
  44 #include "xfs_trans.h"
  45 #include "xfs_buf_item.h"
  46 #include "xfs_sb.h"
  47 #include "xfs_dir.h"
  48 #include "xfs_dmapi.h"
  49 #include "xfs_mount.h"
  50 #include "xfs_trans_priv.h"
  51 #include "xfs_extfree_item.h"
  52
  53
  54 kmem_zone_t     *xfs_efi_zone;
  55 kmem_zone_t     *xfs_efd_zone;
  56
  57 STATIC void     xfs_efi_item_unlock(xfs_efi_log_item_t *);
  58 STATIC void     xfs_efi_item_abort(xfs_efi_log_item_t *);
  59 STATIC void     xfs_efd_item_abort(xfs_efd_log_item_t *);
  60
  61
  62 void
  63 xfs_efi_item_free(xfs_efi_log_item_t *efip)
  64 {
  65         int nexts = efip->efi_format.efi_nextents;
  66
  67         if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
  68                 kmem_free(efip, sizeof(xfs_efi_log_item_t) +
  69                                 (nexts - 1) * sizeof(xfs_extent_t));
  70         } else {
  71                 kmem_zone_free(xfs_efi_zone, efip);
  72         }
  73 }
  74
  75 /*
  76  * This returns the number of iovecs needed to log the given efi item.
  77  * We only need 1 iovec for an efi item.  It just logs the efi_log_format
  78  * structure.
  79  */
  80 /*ARGSUSED*/
  81 STATIC uint
  82 xfs_efi_item_size(xfs_efi_log_item_t *efip)
  83 {
  84         return 1;
  85 }
  86
  87 /*
  88  * This is called to fill in the vector of log iovecs for the
  89  * given efi log item. We use only 1 iovec, and we point that
  90  * at the efi_log_format structure embedded in the efi item.
  91  * It is at this point that we assert that all of the extent
  92  * slots in the efi item have been filled.
  93  */
  94 STATIC void
  95 xfs_efi_item_format(xfs_efi_log_item_t  *efip,
  96                     xfs_log_iovec_t     *log_vector)
  97 {
  98         uint    size;
  99
 100         ASSERT(efip->efi_next_extent == efip->efi_format.efi_nextents);
 101
 102         efip->efi_format.efi_type = XFS_LI_EFI;
 103
 104         size = sizeof(xfs_efi_log_format_t);
 105         size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
 106         efip->efi_format.efi_size = 1;
 107
 108         log_vector->i_addr = (xfs_caddr_t)&(efip->efi_format);
 109         log_vector->i_len = size;
 110         XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFI_FORMAT);
 111         ASSERT(size >= sizeof(xfs_efi_log_format_t));
 112 }
 113
 114
 115 /*
 116  * Pinning has no meaning for an efi item, so just return.
 117  */
 118 /*ARGSUSED*/
 119 STATIC void
 120 xfs_efi_item_pin(xfs_efi_log_item_t *efip)
 121 {
 122         return;
 123 }
 124
 125
 126 /*
 127  * While EFIs cannot really be pinned, the unpin operation is the
 128  * last place at which the EFI is manipulated during a transaction.
 129  * Here we coordinate with xfs_efi_cancel() to determine who gets to
 130  * free the EFI.
 131  */
 132 /*ARGSUSED*/
 133 STATIC void
 134 xfs_efi_item_unpin(xfs_efi_log_item_t *efip, int stale)
 135 {
 136         xfs_mount_t     *mp;
 137         SPLDECL(s);
 138
 139         mp = efip->efi_item.li_mountp;
 140         AIL_LOCK(mp, s);
 141         if (efip->efi_flags & XFS_EFI_CANCELED) {
 142                 /*
 143                  * xfs_trans_delete_ail() drops the AIL lock.
 144                  */
 145                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
 146                 xfs_efi_item_free(efip);
 147         } else {
 148                 efip->efi_flags |= XFS_EFI_COMMITTED;
 149                 AIL_UNLOCK(mp, s);
 150         }
 151 }
 152
 153 /*
 154  * like unpin only we have to also clear the xaction descriptor
 155  * pointing the log item if we free the item.  This routine duplicates
 156  * unpin because efi_flags is protected by the AIL lock.  Freeing
 157  * the descriptor and then calling unpin would force us to drop the AIL
 158  * lock which would open up a race condition.
 159  */
 160 STATIC void
 161 xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
 162 {
 163         xfs_mount_t     *mp;
 164         xfs_log_item_desc_t     *lidp;
 165         SPLDECL(s);
 166
 167         mp = efip->efi_item.li_mountp;
 168         AIL_LOCK(mp, s);
 169         if (efip->efi_flags & XFS_EFI_CANCELED) {
 170                 /*
 171                  * free the xaction descriptor pointing to this item
 172                  */
 173                 lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
 174                 xfs_trans_free_item(tp, lidp);
 175                 /*
 176                  * pull the item off the AIL.
 177                  * xfs_trans_delete_ail() drops the AIL lock.
 178                  */
 179                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
 180                 xfs_efi_item_free(efip);
 181         } else {
 182                 efip->efi_flags |= XFS_EFI_COMMITTED;
 183                 AIL_UNLOCK(mp, s);
 184         }
 185 }
 186
 187 /*
 188  * Efi items have no locking or pushing.  However, since EFIs are
 189  * pulled from the AIL when their corresponding EFDs are committed
 190  * to disk, their situation is very similar to being pinned.  Return
 191  * XFS_ITEM_PINNED so that the caller will eventually flush the log.
 192  * This should help in getting the EFI out of the AIL.
 193  */
 194 /*ARGSUSED*/
 195 STATIC uint
 196 xfs_efi_item_trylock(xfs_efi_log_item_t *efip)
 197 {
 198         return XFS_ITEM_PINNED;
 199 }
 200
 201 /*
 202  * Efi items have no locking, so just return.
 203  */
 204 /*ARGSUSED*/
 205 STATIC void
 206 xfs_efi_item_unlock(xfs_efi_log_item_t *efip)
 207 {
 208         if (efip->efi_item.li_flags & XFS_LI_ABORTED)
 209                 xfs_efi_item_abort(efip);
 210         return;
 211 }
 212
 213 /*
 214  * The EFI is logged only once and cannot be moved in the log, so
 215  * simply return the lsn at which it's been logged.  The canceled
 216  * flag is not paid any attention here.  Checking for that is delayed
 217  * until the EFI is unpinned.
 218  */
 219 /*ARGSUSED*/
 220 STATIC xfs_lsn_t
 221 xfs_efi_item_committed(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
 222 {
 223         return lsn;
 224 }
 225
 226 /*
 227  * This is called when the transaction logging the EFI is aborted.
 228  * Free up the EFI and return.  No need to clean up the slot for
 229  * the item in the transaction.  That was done by the unpin code
 230  * which is called prior to this routine in the abort/fs-shutdown path.
 231  */
 232 STATIC void
 233 xfs_efi_item_abort(xfs_efi_log_item_t *efip)
 234 {
 235         xfs_efi_item_free(efip);
 236 }
 237
 238 /*
 239  * There isn't much you can do to push on an efi item.  It is simply
 240  * stuck waiting for all of its corresponding efd items to be
 241  * committed to disk.
 242  */
 243 /*ARGSUSED*/
 244 STATIC void
 245 xfs_efi_item_push(xfs_efi_log_item_t *efip)
 246 {
 247         return;
 248 }
 249
 250 /*
 251  * The EFI dependency tracking op doesn't do squat.  It can't because
 252  * it doesn't know where the free extent is coming from.  The dependency
 253  * tracking has to be handled by the "enclosing" metadata object.  For
 254  * example, for inodes, the inode is locked throughout the extent freeing
 255  * so the dependency should be recorded there.
 256  */
 257 /*ARGSUSED*/
 258 STATIC void
 259 xfs_efi_item_committing(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
 260 {
 261         return;
 262 }
 263
 264 /*
 265  * This is the ops vector shared by all efi log items.
 266  */
 267 STATIC struct xfs_item_ops xfs_efi_item_ops = {
 268         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_efi_item_size,
 269         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 270                                         xfs_efi_item_format,
 271         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
 272         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_efi_item_unpin,
 273         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
 274                                         xfs_efi_item_unpin_remove,
 275         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
 276         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_efi_item_unlock,
 277         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 278                                         xfs_efi_item_committed,
 279         .iop_push       = (void(*)(xfs_log_item_t*))xfs_efi_item_push,
 280         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_efi_item_abort,
 281         .iop_pushbuf    = NULL,
 282         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 283                                         xfs_efi_item_committing
 284 };
 285
 286
 287 /*
 288  * Allocate and initialize an efi item with the given number of extents.
 289  */
 290 xfs_efi_log_item_t *
 291 xfs_efi_init(xfs_mount_t        *mp,
 292              uint               nextents)
 293
 294 {
 295         xfs_efi_log_item_t      *efip;
 296         uint                    size;
 297
 298         ASSERT(nextents > 0);
 299         if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
 300                 size = (uint)(sizeof(xfs_efi_log_item_t) +
 301                         ((nextents - 1) * sizeof(xfs_extent_t)));
 302                 efip = (xfs_efi_log_item_t*)kmem_zalloc(size, KM_SLEEP);
 303         } else {
 304                 efip = (xfs_efi_log_item_t*)kmem_zone_zalloc(xfs_efi_zone,
 305                                                              KM_SLEEP);
 306         }
 307
 308         efip->efi_item.li_type = XFS_LI_EFI;
 309         efip->efi_item.li_ops = &xfs_efi_item_ops;
 310         efip->efi_item.li_mountp = mp;
 311         efip->efi_format.efi_nextents = nextents;
 312         efip->efi_format.efi_id = (__psint_t)(void*)efip;
 313
 314         return (efip);
 315 }
 316
 317 /*
 318  * This is called by the efd item code below to release references to
 319  * the given efi item.  Each efd calls this with the number of
 320  * extents that it has logged, and when the sum of these reaches
 321  * the total number of extents logged by this efi item we can free
 322  * the efi item.
 323  *
 324  * Freeing the efi item requires that we remove it from the AIL.
 325  * We'll use the AIL lock to protect our counters as well as
 326  * the removal from the AIL.
 327  */
 328 void
 329 xfs_efi_release(xfs_efi_log_item_t      *efip,
 330                 uint                    nextents)
 331 {
 332         xfs_mount_t     *mp;
 333         int             extents_left;
 334         SPLDECL(s);
 335
 336         mp = efip->efi_item.li_mountp;
 337         ASSERT(efip->efi_next_extent > 0);
 338         ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
 339
 340         AIL_LOCK(mp, s);
 341         ASSERT(efip->efi_next_extent >= nextents);
 342         efip->efi_next_extent -= nextents;
 343         extents_left = efip->efi_next_extent;
 344         if (extents_left == 0) {
 345                 /*
 346                  * xfs_trans_delete_ail() drops the AIL lock.
 347                  */
 348                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
 349                 xfs_efi_item_free(efip);
 350         } else {
 351                 AIL_UNLOCK(mp, s);
 352         }
 353 }
 354
 355 /*
 356  * This is called when the transaction that should be committing the
 357  * EFD corresponding to the given EFI is aborted.  The committed and
 358  * canceled flags are used to coordinate the freeing of the EFI and
 359  * the references by the transaction that committed it.
 360  */
 361 STATIC void
 362 xfs_efi_cancel(
 363         xfs_efi_log_item_t      *efip)
 364 {
 365         xfs_mount_t     *mp;
 366         SPLDECL(s);
 367
 368         mp = efip->efi_item.li_mountp;
 369         AIL_LOCK(mp, s);
 370         if (efip->efi_flags & XFS_EFI_COMMITTED) {
 371                 /*
 372                  * xfs_trans_delete_ail() drops the AIL lock.
 373                  */
 374                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip, s);
 375                 xfs_efi_item_free(efip);
 376         } else {
 377                 efip->efi_flags |= XFS_EFI_CANCELED;
 378                 AIL_UNLOCK(mp, s);
 379         }
 380 }
 381
 382 STATIC void
 383 xfs_efd_item_free(xfs_efd_log_item_t *efdp)
 384 {
 385         int nexts = efdp->efd_format.efd_nextents;
 386
 387         if (nexts > XFS_EFD_MAX_FAST_EXTENTS) {
 388                 kmem_free(efdp, sizeof(xfs_efd_log_item_t) +
 389                                 (nexts - 1) * sizeof(xfs_extent_t));
 390         } else {
 391                 kmem_zone_free(xfs_efd_zone, efdp);
 392         }
 393 }
 394
 395 /*
 396  * This returns the number of iovecs needed to log the given efd item.
 397  * We only need 1 iovec for an efd item.  It just logs the efd_log_format
 398  * structure.
 399  */
 400 /*ARGSUSED*/
 401 STATIC uint
 402 xfs_efd_item_size(xfs_efd_log_item_t *efdp)
 403 {
 404         return 1;
 405 }
 406
 407 /*
 408  * This is called to fill in the vector of log iovecs for the
 409  * given efd log item. We use only 1 iovec, and we point that
 410  * at the efd_log_format structure embedded in the efd item.
 411  * It is at this point that we assert that all of the extent
 412  * slots in the efd item have been filled.
 413  */
 414 STATIC void
 415 xfs_efd_item_format(xfs_efd_log_item_t  *efdp,
 416                     xfs_log_iovec_t     *log_vector)
 417 {
 418         uint    size;
 419
 420         ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
 421
 422         efdp->efd_format.efd_type = XFS_LI_EFD;
 423
 424         size = sizeof(xfs_efd_log_format_t);
 425         size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
 426         efdp->efd_format.efd_size = 1;
 427
 428         log_vector->i_addr = (xfs_caddr_t)&(efdp->efd_format);
 429         log_vector->i_len = size;
 430         XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFD_FORMAT);
 431         ASSERT(size >= sizeof(xfs_efd_log_format_t));
 432 }
 433
 434
 435 /*
 436  * Pinning has no meaning for an efd item, so just return.
 437  */
 438 /*ARGSUSED*/
 439 STATIC void
 440 xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
 441 {
 442         return;
 443 }
 444
 445
 446 /*
 447  * Since pinning has no meaning for an efd item, unpinning does
 448  * not either.
 449  */
 450 /*ARGSUSED*/
 451 STATIC void
 452 xfs_efd_item_unpin(xfs_efd_log_item_t *efdp, int stale)
 453 {
 454         return;
 455 }
 456
 457 /*ARGSUSED*/
 458 STATIC void
 459 xfs_efd_item_unpin_remove(xfs_efd_log_item_t *efdp, xfs_trans_t *tp)
 460 {
 461         return;
 462 }
 463
 464 /*
 465  * Efd items have no locking, so just return success.
 466  */
 467 /*ARGSUSED*/
 468 STATIC uint
 469 xfs_efd_item_trylock(xfs_efd_log_item_t *efdp)
 470 {
 471         return XFS_ITEM_LOCKED;
 472 }
 473
 474 /*
 475  * Efd items have no locking or pushing, so return failure
 476  * so that the caller doesn't bother with us.
 477  */
 478 /*ARGSUSED*/
 479 STATIC void
 480 xfs_efd_item_unlock(xfs_efd_log_item_t *efdp)
 481 {
 482         if (efdp->efd_item.li_flags & XFS_LI_ABORTED)
 483                 xfs_efd_item_abort(efdp);
 484         return;
 485 }
 486
 487 /*
 488  * When the efd item is committed to disk, all we need to do
 489  * is delete our reference to our partner efi item and then
 490  * free ourselves.  Since we're freeing ourselves we must
 491  * return -1 to keep the transaction code from further referencing
 492  * this item.
 493  */
 494 /*ARGSUSED*/
 495 STATIC xfs_lsn_t
 496 xfs_efd_item_committed(xfs_efd_log_item_t *efdp, xfs_lsn_t lsn)
 497 {
 498         /*
 499          * If we got a log I/O error, it's always the case that the LR with the
 500          * EFI got unpinned and freed before the EFD got aborted.
 501          */
 502         if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
 503                 xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
 504
 505         xfs_efd_item_free(efdp);
 506         return (xfs_lsn_t)-1;
 507 }
 508
 509 /*
 510  * The transaction of which this EFD is a part has been aborted.
 511  * Inform its companion EFI of this fact and then clean up after
 512  * ourselves.  No need to clean up the slot for the item in the
 513  * transaction.  That was done by the unpin code which is called
 514  * prior to this routine in the abort/fs-shutdown path.
 515  */
 516 STATIC void
 517 xfs_efd_item_abort(xfs_efd_log_item_t *efdp)
 518 {
 519         /*
 520          * If we got a log I/O error, it's always the case that the LR with the
 521          * EFI got unpinned and freed before the EFD got aborted. So don't
 522          * reference the EFI at all in that case.
 523          */
 524         if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
 525                 xfs_efi_cancel(efdp->efd_efip);
 526
 527         xfs_efd_item_free(efdp);
 528 }
 529
 530 /*
 531  * There isn't much you can do to push on an efd item.  It is simply
 532  * stuck waiting for the log to be flushed to disk.
 533  */
 534 /*ARGSUSED*/
 535 STATIC void
 536 xfs_efd_item_push(xfs_efd_log_item_t *efdp)
 537 {
 538         return;
 539 }
 540
 541 /*
 542  * The EFD dependency tracking op doesn't do squat.  It can't because
 543  * it doesn't know where the free extent is coming from.  The dependency
 544  * tracking has to be handled by the "enclosing" metadata object.  For
 545  * example, for inodes, the inode is locked throughout the extent freeing
 546  * so the dependency should be recorded there.
 547  */
 548 /*ARGSUSED*/
 549 STATIC void
 550 xfs_efd_item_committing(xfs_efd_log_item_t *efip, xfs_lsn_t lsn)
 551 {
 552         return;
 553 }
 554
 555 /*
 556  * This is the ops vector shared by all efd log items.
 557  */
 558 STATIC struct xfs_item_ops xfs_efd_item_ops = {
 559         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_efd_item_size,
 560         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 561                                         xfs_efd_item_format,
 562         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
 563         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_efd_item_unpin,
 564         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 565                                         xfs_efd_item_unpin_remove,
 566         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
 567         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_efd_item_unlock,
 568         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 569                                         xfs_efd_item_committed,
 570         .iop_push       = (void(*)(xfs_log_item_t*))xfs_efd_item_push,
 571         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_efd_item_abort,
 572         .iop_pushbuf    = NULL,
 573         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 574                                         xfs_efd_item_committing
 575 };
 576
 577
 578 /*
 579  * Allocate and initialize an efd item with the given number of extents.
 580  */
 581 xfs_efd_log_item_t *
 582 xfs_efd_init(xfs_mount_t        *mp,
 583              xfs_efi_log_item_t *efip,
 584              uint               nextents)
 585
 586 {
 587         xfs_efd_log_item_t      *efdp;
 588         uint                    size;
 589
 590         ASSERT(nextents > 0);
 591         if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
 592                 size = (uint)(sizeof(xfs_efd_log_item_t) +
 593                         ((nextents - 1) * sizeof(xfs_extent_t)));
 594                 efdp = (xfs_efd_log_item_t*)kmem_zalloc(size, KM_SLEEP);
 595         } else {
 596                 efdp = (xfs_efd_log_item_t*)kmem_zone_zalloc(xfs_efd_zone,
 597                                                              KM_SLEEP);
 598         }
 599
 600         efdp->efd_item.li_type = XFS_LI_EFD;
 601         efdp->efd_item.li_ops = &xfs_efd_item_ops;
 602         efdp->efd_item.li_mountp = mp;
 603         efdp->efd_efip = efip;
 604         efdp->efd_format.efd_nextents = nextents;
 605         efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
 606
 607         return (efdp);
 608 }