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