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