fs/xfs/xfs_extfree_item.c

   1 /*
   2  * Copyright (c) 2000-2001,2005 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_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_buf_item.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dmapi.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_trans_priv.h"
  30 #include "xfs_extfree_item.h"
  31
  32
  33 kmem_zone_t     *xfs_efi_zone;
  34 kmem_zone_t     *xfs_efd_zone;
  35
  36 STATIC void     xfs_efi_item_unlock(xfs_efi_log_item_t *);
  37
  38 void
  39 xfs_efi_item_free(xfs_efi_log_item_t *efip)
  40 {
  41         int nexts = efip->efi_format.efi_nextents;
  42
  43         if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
  44                 kmem_free(efip);
  45         } else {
  46                 kmem_zone_free(xfs_efi_zone, efip);
  47         }
  48 }
  49
  50 /*
  51  * This returns the number of iovecs needed to log the given efi item.
  52  * We only need 1 iovec for an efi item.  It just logs the efi_log_format
  53  * structure.
  54  */
  55 /*ARGSUSED*/
  56 STATIC uint
  57 xfs_efi_item_size(xfs_efi_log_item_t *efip)
  58 {
  59         return 1;
  60 }
  61
  62 /*
  63  * This is called to fill in the vector of log iovecs for the
  64  * given efi log item. We use only 1 iovec, and we point that
  65  * at the efi_log_format structure embedded in the efi item.
  66  * It is at this point that we assert that all of the extent
  67  * slots in the efi item have been filled.
  68  */
  69 STATIC void
  70 xfs_efi_item_format(xfs_efi_log_item_t  *efip,
  71                     xfs_log_iovec_t     *log_vector)
  72 {
  73         uint    size;
  74
  75         ASSERT(efip->efi_next_extent == efip->efi_format.efi_nextents);
  76
  77         efip->efi_format.efi_type = XFS_LI_EFI;
  78
  79         size = sizeof(xfs_efi_log_format_t);
  80         size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
  81         efip->efi_format.efi_size = 1;
  82
  83         log_vector->i_addr = (xfs_caddr_t)&(efip->efi_format);
  84         log_vector->i_len = size;
  85         log_vector->i_type = XLOG_REG_TYPE_EFI_FORMAT;
  86         ASSERT(size >= sizeof(xfs_efi_log_format_t));
  87 }
  88
  89
  90 /*
  91  * Pinning has no meaning for an efi item, so just return.
  92  */
  93 /*ARGSUSED*/
  94 STATIC void
  95 xfs_efi_item_pin(xfs_efi_log_item_t *efip)
  96 {
  97         return;
  98 }
  99
 100
 101 /*
 102  * While EFIs cannot really be pinned, the unpin operation is the
 103  * last place at which the EFI is manipulated during a transaction.
 104  * Here we coordinate with xfs_efi_cancel() to determine who gets to
 105  * free the EFI.
 106  */
 107 /*ARGSUSED*/
 108 STATIC void
 109 xfs_efi_item_unpin(xfs_efi_log_item_t *efip)
 110 {
 111         struct xfs_ail          *ailp = efip->efi_item.li_ailp;
 112
 113         spin_lock(&ailp->xa_lock);
 114         if (efip->efi_flags & XFS_EFI_CANCELED) {
 115                 /* xfs_trans_ail_delete() drops the AIL lock. */
 116                 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
 117                 xfs_efi_item_free(efip);
 118         } else {
 119                 efip->efi_flags |= XFS_EFI_COMMITTED;
 120                 spin_unlock(&ailp->xa_lock);
 121         }
 122 }
 123
 124 /*
 125  * like unpin only we have to also clear the xaction descriptor
 126  * pointing the log item if we free the item.  This routine duplicates
 127  * unpin because efi_flags is protected by the AIL lock.  Freeing
 128  * the descriptor and then calling unpin would force us to drop the AIL
 129  * lock which would open up a race condition.
 130  */
 131 STATIC void
 132 xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
 133 {
 134         struct xfs_ail          *ailp = efip->efi_item.li_ailp;
 135         xfs_log_item_desc_t     *lidp;
 136
 137         spin_lock(&ailp->xa_lock);
 138         if (efip->efi_flags & XFS_EFI_CANCELED) {
 139                 /*
 140                  * free the xaction descriptor pointing to this item
 141                  */
 142                 lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
 143                 xfs_trans_free_item(tp, lidp);
 144
 145                 /* xfs_trans_ail_delete() drops the AIL lock. */
 146                 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
 147                 xfs_efi_item_free(efip);
 148         } else {
 149                 efip->efi_flags |= XFS_EFI_COMMITTED;
 150                 spin_unlock(&ailp->xa_lock);
 151         }
 152 }
 153
 154 /*
 155  * Efi items have no locking or pushing.  However, since EFIs are
 156  * pulled from the AIL when their corresponding EFDs are committed
 157  * to disk, their situation is very similar to being pinned.  Return
 158  * XFS_ITEM_PINNED so that the caller will eventually flush the log.
 159  * This should help in getting the EFI out of the AIL.
 160  */
 161 /*ARGSUSED*/
 162 STATIC uint
 163 xfs_efi_item_trylock(xfs_efi_log_item_t *efip)
 164 {
 165         return XFS_ITEM_PINNED;
 166 }
 167
 168 /*
 169  * Efi items have no locking, so just return.
 170  */
 171 /*ARGSUSED*/
 172 STATIC void
 173 xfs_efi_item_unlock(xfs_efi_log_item_t *efip)
 174 {
 175         if (efip->efi_item.li_flags & XFS_LI_ABORTED)
 176                 xfs_efi_item_free(efip);
 177         return;
 178 }
 179
 180 /*
 181  * The EFI is logged only once and cannot be moved in the log, so
 182  * simply return the lsn at which it's been logged.  The canceled
 183  * flag is not paid any attention here.  Checking for that is delayed
 184  * until the EFI is unpinned.
 185  */
 186 /*ARGSUSED*/
 187 STATIC xfs_lsn_t
 188 xfs_efi_item_committed(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
 189 {
 190         return lsn;
 191 }
 192
 193 /*
 194  * There isn't much you can do to push on an efi item.  It is simply
 195  * stuck waiting for all of its corresponding efd items to be
 196  * committed to disk.
 197  */
 198 /*ARGSUSED*/
 199 STATIC void
 200 xfs_efi_item_push(xfs_efi_log_item_t *efip)
 201 {
 202         return;
 203 }
 204
 205 /*
 206  * The EFI dependency tracking op doesn't do squat.  It can't because
 207  * it doesn't know where the free extent is coming from.  The dependency
 208  * tracking has to be handled by the "enclosing" metadata object.  For
 209  * example, for inodes, the inode is locked throughout the extent freeing
 210  * so the dependency should be recorded there.
 211  */
 212 /*ARGSUSED*/
 213 STATIC void
 214 xfs_efi_item_committing(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
 215 {
 216         return;
 217 }
 218
 219 /*
 220  * This is the ops vector shared by all efi log items.
 221  */
 222 static struct xfs_item_ops xfs_efi_item_ops = {
 223         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_efi_item_size,
 224         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 225                                         xfs_efi_item_format,
 226         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
 227         .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_efi_item_unpin,
 228         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
 229                                         xfs_efi_item_unpin_remove,
 230         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
 231         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_efi_item_unlock,
 232         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 233                                         xfs_efi_item_committed,
 234         .iop_push       = (void(*)(xfs_log_item_t*))xfs_efi_item_push,
 235         .iop_pushbuf    = NULL,
 236         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 237                                         xfs_efi_item_committing
 238 };
 239
 240
 241 /*
 242  * Allocate and initialize an efi item with the given number of extents.
 243  */
 244 xfs_efi_log_item_t *
 245 xfs_efi_init(xfs_mount_t        *mp,
 246              uint               nextents)
 247
 248 {
 249         xfs_efi_log_item_t      *efip;
 250         uint                    size;
 251
 252         ASSERT(nextents > 0);
 253         if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
 254                 size = (uint)(sizeof(xfs_efi_log_item_t) +
 255                         ((nextents - 1) * sizeof(xfs_extent_t)));
 256                 efip = (xfs_efi_log_item_t*)kmem_zalloc(size, KM_SLEEP);
 257         } else {
 258                 efip = (xfs_efi_log_item_t*)kmem_zone_zalloc(xfs_efi_zone,
 259                                                              KM_SLEEP);
 260         }
 261
 262         xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops);
 263         efip->efi_format.efi_nextents = nextents;
 264         efip->efi_format.efi_id = (__psint_t)(void*)efip;
 265
 266         return (efip);
 267 }
 268
 269 /*
 270  * Copy an EFI format buffer from the given buf, and into the destination
 271  * EFI format structure.
 272  * The given buffer can be in 32 bit or 64 bit form (which has different padding),
 273  * one of which will be the native format for this kernel.
 274  * It will handle the conversion of formats if necessary.
 275  */
 276 int
 277 xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
 278 {
 279         xfs_efi_log_format_t *src_efi_fmt = (xfs_efi_log_format_t *)buf->i_addr;
 280         uint i;
 281         uint len = sizeof(xfs_efi_log_format_t) +
 282                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t);
 283         uint len32 = sizeof(xfs_efi_log_format_32_t) +
 284                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t);
 285         uint len64 = sizeof(xfs_efi_log_format_64_t) +
 286                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t);
 287
 288         if (buf->i_len == len) {
 289                 memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len);
 290                 return 0;
 291         } else if (buf->i_len == len32) {
 292                 xfs_efi_log_format_32_t *src_efi_fmt_32 =
 293                         (xfs_efi_log_format_32_t *)buf->i_addr;
 294
 295                 dst_efi_fmt->efi_type     = src_efi_fmt_32->efi_type;
 296                 dst_efi_fmt->efi_size     = src_efi_fmt_32->efi_size;
 297                 dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
 298                 dst_efi_fmt->efi_id       = src_efi_fmt_32->efi_id;
 299                 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
 300                         dst_efi_fmt->efi_extents[i].ext_start =
 301                                 src_efi_fmt_32->efi_extents[i].ext_start;
 302                         dst_efi_fmt->efi_extents[i].ext_len =
 303                                 src_efi_fmt_32->efi_extents[i].ext_len;
 304                 }
 305                 return 0;
 306         } else if (buf->i_len == len64) {
 307                 xfs_efi_log_format_64_t *src_efi_fmt_64 =
 308                         (xfs_efi_log_format_64_t *)buf->i_addr;
 309
 310                 dst_efi_fmt->efi_type     = src_efi_fmt_64->efi_type;
 311                 dst_efi_fmt->efi_size     = src_efi_fmt_64->efi_size;
 312                 dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
 313                 dst_efi_fmt->efi_id       = src_efi_fmt_64->efi_id;
 314                 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
 315                         dst_efi_fmt->efi_extents[i].ext_start =
 316                                 src_efi_fmt_64->efi_extents[i].ext_start;
 317                         dst_efi_fmt->efi_extents[i].ext_len =
 318                                 src_efi_fmt_64->efi_extents[i].ext_len;
 319                 }
 320                 return 0;
 321         }
 322         return EFSCORRUPTED;
 323 }
 324
 325 /*
 326  * This is called by the efd item code below to release references to
 327  * the given efi item.  Each efd calls this with the number of
 328  * extents that it has logged, and when the sum of these reaches
 329  * the total number of extents logged by this efi item we can free
 330  * the efi item.
 331  *
 332  * Freeing the efi item requires that we remove it from the AIL.
 333  * We'll use the AIL lock to protect our counters as well as
 334  * the removal from the AIL.
 335  */
 336 void
 337 xfs_efi_release(xfs_efi_log_item_t      *efip,
 338                 uint                    nextents)
 339 {
 340         struct xfs_ail          *ailp = efip->efi_item.li_ailp;
 341         int                     extents_left;
 342
 343         ASSERT(efip->efi_next_extent > 0);
 344         ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
 345
 346         spin_lock(&ailp->xa_lock);
 347         ASSERT(efip->efi_next_extent >= nextents);
 348         efip->efi_next_extent -= nextents;
 349         extents_left = efip->efi_next_extent;
 350         if (extents_left == 0) {
 351                 /* xfs_trans_ail_delete() drops the AIL lock. */
 352                 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)efip);
 353                 xfs_efi_item_free(efip);
 354         } else {
 355                 spin_unlock(&ailp->xa_lock);
 356         }
 357 }
 358
 359 STATIC void
 360 xfs_efd_item_free(xfs_efd_log_item_t *efdp)
 361 {
 362         int nexts = efdp->efd_format.efd_nextents;
 363
 364         if (nexts > XFS_EFD_MAX_FAST_EXTENTS) {
 365                 kmem_free(efdp);
 366         } else {
 367                 kmem_zone_free(xfs_efd_zone, efdp);
 368         }
 369 }
 370
 371 /*
 372  * This returns the number of iovecs needed to log the given efd item.
 373  * We only need 1 iovec for an efd item.  It just logs the efd_log_format
 374  * structure.
 375  */
 376 /*ARGSUSED*/
 377 STATIC uint
 378 xfs_efd_item_size(xfs_efd_log_item_t *efdp)
 379 {
 380         return 1;
 381 }
 382
 383 /*
 384  * This is called to fill in the vector of log iovecs for the
 385  * given efd log item. We use only 1 iovec, and we point that
 386  * at the efd_log_format structure embedded in the efd item.
 387  * It is at this point that we assert that all of the extent
 388  * slots in the efd item have been filled.
 389  */
 390 STATIC void
 391 xfs_efd_item_format(xfs_efd_log_item_t  *efdp,
 392                     xfs_log_iovec_t     *log_vector)
 393 {
 394         uint    size;
 395
 396         ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
 397
 398         efdp->efd_format.efd_type = XFS_LI_EFD;
 399
 400         size = sizeof(xfs_efd_log_format_t);
 401         size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
 402         efdp->efd_format.efd_size = 1;
 403
 404         log_vector->i_addr = (xfs_caddr_t)&(efdp->efd_format);
 405         log_vector->i_len = size;
 406         log_vector->i_type = XLOG_REG_TYPE_EFD_FORMAT;
 407         ASSERT(size >= sizeof(xfs_efd_log_format_t));
 408 }
 409
 410
 411 /*
 412  * Pinning has no meaning for an efd item, so just return.
 413  */
 414 /*ARGSUSED*/
 415 STATIC void
 416 xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
 417 {
 418         return;
 419 }
 420
 421
 422 /*
 423  * Since pinning has no meaning for an efd item, unpinning does
 424  * not either.
 425  */
 426 /*ARGSUSED*/
 427 STATIC void
 428 xfs_efd_item_unpin(xfs_efd_log_item_t *efdp)
 429 {
 430         return;
 431 }
 432
 433 /*ARGSUSED*/
 434 STATIC void
 435 xfs_efd_item_unpin_remove(xfs_efd_log_item_t *efdp, xfs_trans_t *tp)
 436 {
 437         return;
 438 }
 439
 440 /*
 441  * Efd items have no locking, so just return success.
 442  */
 443 /*ARGSUSED*/
 444 STATIC uint
 445 xfs_efd_item_trylock(xfs_efd_log_item_t *efdp)
 446 {
 447         return XFS_ITEM_LOCKED;
 448 }
 449
 450 /*
 451  * Efd items have no locking or pushing, so return failure
 452  * so that the caller doesn't bother with us.
 453  */
 454 /*ARGSUSED*/
 455 STATIC void
 456 xfs_efd_item_unlock(xfs_efd_log_item_t *efdp)
 457 {
 458         if (efdp->efd_item.li_flags & XFS_LI_ABORTED)
 459                 xfs_efd_item_free(efdp);
 460         return;
 461 }
 462
 463 /*
 464  * When the efd item is committed to disk, all we need to do
 465  * is delete our reference to our partner efi item and then
 466  * free ourselves.  Since we're freeing ourselves we must
 467  * return -1 to keep the transaction code from further referencing
 468  * this item.
 469  */
 470 /*ARGSUSED*/
 471 STATIC xfs_lsn_t
 472 xfs_efd_item_committed(xfs_efd_log_item_t *efdp, xfs_lsn_t lsn)
 473 {
 474         /*
 475          * If we got a log I/O error, it's always the case that the LR with the
 476          * EFI got unpinned and freed before the EFD got aborted.
 477          */
 478         if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
 479                 xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
 480
 481         xfs_efd_item_free(efdp);
 482         return (xfs_lsn_t)-1;
 483 }
 484
 485 /*
 486  * There isn't much you can do to push on an efd item.  It is simply
 487  * stuck waiting for the log to be flushed to disk.
 488  */
 489 /*ARGSUSED*/
 490 STATIC void
 491 xfs_efd_item_push(xfs_efd_log_item_t *efdp)
 492 {
 493         return;
 494 }
 495
 496 /*
 497  * The EFD dependency tracking op doesn't do squat.  It can't because
 498  * it doesn't know where the free extent is coming from.  The dependency
 499  * tracking has to be handled by the "enclosing" metadata object.  For
 500  * example, for inodes, the inode is locked throughout the extent freeing
 501  * so the dependency should be recorded there.
 502  */
 503 /*ARGSUSED*/
 504 STATIC void
 505 xfs_efd_item_committing(xfs_efd_log_item_t *efip, xfs_lsn_t lsn)
 506 {
 507         return;
 508 }
 509
 510 /*
 511  * This is the ops vector shared by all efd log items.
 512  */
 513 static struct xfs_item_ops xfs_efd_item_ops = {
 514         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_efd_item_size,
 515         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 516                                         xfs_efd_item_format,
 517         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
 518         .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_efd_item_unpin,
 519         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 520                                         xfs_efd_item_unpin_remove,
 521         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
 522         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_efd_item_unlock,
 523         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 524                                         xfs_efd_item_committed,
 525         .iop_push       = (void(*)(xfs_log_item_t*))xfs_efd_item_push,
 526         .iop_pushbuf    = NULL,
 527         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 528                                         xfs_efd_item_committing
 529 };
 530
 531
 532 /*
 533  * Allocate and initialize an efd item with the given number of extents.
 534  */
 535 xfs_efd_log_item_t *
 536 xfs_efd_init(xfs_mount_t        *mp,
 537              xfs_efi_log_item_t *efip,
 538              uint               nextents)
 539
 540 {
 541         xfs_efd_log_item_t      *efdp;
 542         uint                    size;
 543
 544         ASSERT(nextents > 0);
 545         if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
 546                 size = (uint)(sizeof(xfs_efd_log_item_t) +
 547                         ((nextents - 1) * sizeof(xfs_extent_t)));
 548                 efdp = (xfs_efd_log_item_t*)kmem_zalloc(size, KM_SLEEP);
 549         } else {
 550                 efdp = (xfs_efd_log_item_t*)kmem_zone_zalloc(xfs_efd_zone,
 551                                                              KM_SLEEP);
 552         }
 553
 554         xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops);
 555         efdp->efd_efip = efip;
 556         efdp->efd_format.efd_nextents = nextents;
 557         efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
 558
 559         return (efdp);
 560 }