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_format.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_mount.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_trans_priv.h"
  26 #include "xfs_buf_item.h"
  27 #include "xfs_extfree_item.h"
  28 #include "xfs_log.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 reference
  54  * count to ensure only the last caller frees the EFI.
  55  */
  56 STATIC void
  57 __xfs_efi_release(
  58         struct xfs_efi_log_item *efip)
  59 {
  60         struct xfs_ail          *ailp = efip->efi_item.li_ailp;
  61
  62         if (atomic_dec_and_test(&efip->efi_refcount)) {
  63                 spin_lock(&ailp->xa_lock);
  64                 /* xfs_trans_ail_delete() drops the AIL lock. */
  65                 xfs_trans_ail_delete(ailp, &efip->efi_item,
  66                                      SHUTDOWN_LOG_IO_ERROR);
  67                 xfs_efi_item_free(efip);
  68         }
  69 }
  70
  71 /*
  72  * This returns the number of iovecs needed to log the given efi item.
  73  * We only need 1 iovec for an efi item.  It just logs the efi_log_format
  74  * structure.
  75  */
  76 static inline int
  77 xfs_efi_item_sizeof(
  78         struct xfs_efi_log_item *efip)
  79 {
  80         return sizeof(struct xfs_efi_log_format) +
  81                (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
  82 }
  83
  84 STATIC void
  85 xfs_efi_item_size(
  86         struct xfs_log_item     *lip,
  87         int                     *nvecs,
  88         int                     *nbytes)
  89 {
  90         *nvecs += 1;
  91         *nbytes += xfs_efi_item_sizeof(EFI_ITEM(lip));
  92 }
  93
  94 /*
  95  * This is called to fill in the vector of log iovecs for the
  96  * given efi log item. We use only 1 iovec, and we point that
  97  * at the efi_log_format structure embedded in the efi item.
  98  * It is at this point that we assert that all of the extent
  99  * slots in the efi item have been filled.
 100  */
 101 STATIC void
 102 xfs_efi_item_format(
 103         struct xfs_log_item     *lip,
 104         struct xfs_log_vec      *lv)
 105 {
 106         struct xfs_efi_log_item *efip = EFI_ITEM(lip);
 107         struct xfs_log_iovec    *vecp = NULL;
 108
 109         ASSERT(atomic_read(&efip->efi_next_extent) ==
 110                                 efip->efi_format.efi_nextents);
 111
 112         efip->efi_format.efi_type = XFS_LI_EFI;
 113         efip->efi_format.efi_size = 1;
 114
 115         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFI_FORMAT,
 116                         &efip->efi_format,
 117                         xfs_efi_item_sizeof(efip));
 118 }
 119
 120
 121 /*
 122  * Pinning has no meaning for an efi item, so just return.
 123  */
 124 STATIC void
 125 xfs_efi_item_pin(
 126         struct xfs_log_item     *lip)
 127 {
 128 }
 129
 130 /*
 131  * While EFIs cannot really be pinned, the unpin operation is the last place at
 132  * which the EFI is manipulated during a transaction.  If we are being asked to
 133  * remove the EFI it's because the transaction has been cancelled and by
 134  * definition that means the EFI cannot be in the AIL so remove it from the
 135  * transaction and free it.  Otherwise coordinate with xfs_efi_release()
 136  * to determine who gets to free the EFI.
 137  */
 138 STATIC void
 139 xfs_efi_item_unpin(
 140         struct xfs_log_item     *lip,
 141         int                     remove)
 142 {
 143         struct xfs_efi_log_item *efip = EFI_ITEM(lip);
 144
 145         if (remove) {
 146                 ASSERT(!(lip->li_flags & XFS_LI_IN_AIL));
 147                 if (lip->li_desc)
 148                         xfs_trans_del_item(lip);
 149                 xfs_efi_item_free(efip);
 150                 return;
 151         }
 152         __xfs_efi_release(efip);
 153 }
 154
 155 /*
 156  * Efi items have no locking or pushing.  However, since EFIs are pulled from
 157  * the AIL when their corresponding EFDs are committed to disk, their situation
 158  * is very similar to being pinned.  Return XFS_ITEM_PINNED so that the caller
 159  * will eventually flush the log.  This should help in getting the EFI out of
 160  * the AIL.
 161  */
 162 STATIC uint
 163 xfs_efi_item_push(
 164         struct xfs_log_item     *lip,
 165         struct list_head        *buffer_list)
 166 {
 167         return XFS_ITEM_PINNED;
 168 }
 169
 170 STATIC void
 171 xfs_efi_item_unlock(
 172         struct xfs_log_item     *lip)
 173 {
 174         if (lip->li_flags & XFS_LI_ABORTED)
 175                 xfs_efi_item_free(EFI_ITEM(lip));
 176 }
 177
 178 /*
 179  * The EFI is logged only once and cannot be moved in the log, so simply return
 180  * the lsn at which it's been logged.
 181  */
 182 STATIC xfs_lsn_t
 183 xfs_efi_item_committed(
 184         struct xfs_log_item     *lip,
 185         xfs_lsn_t               lsn)
 186 {
 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         atomic_set(&efip->efi_refcount, 2);
 245
 246         return efip;
 247 }
 248
 249 /*
 250  * Copy an EFI format buffer from the given buf, and into the destination
 251  * EFI format structure.
 252  * The given buffer can be in 32 bit or 64 bit form (which has different padding),
 253  * one of which will be the native format for this kernel.
 254  * It will handle the conversion of formats if necessary.
 255  */
 256 int
 257 xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
 258 {
 259         xfs_efi_log_format_t *src_efi_fmt = buf->i_addr;
 260         uint i;
 261         uint len = sizeof(xfs_efi_log_format_t) +
 262                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t);
 263         uint len32 = sizeof(xfs_efi_log_format_32_t) +
 264                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t);
 265         uint len64 = sizeof(xfs_efi_log_format_64_t) +
 266                 (src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t);
 267
 268         if (buf->i_len == len) {
 269                 memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len);
 270                 return 0;
 271         } else if (buf->i_len == len32) {
 272                 xfs_efi_log_format_32_t *src_efi_fmt_32 = buf->i_addr;
 273
 274                 dst_efi_fmt->efi_type     = src_efi_fmt_32->efi_type;
 275                 dst_efi_fmt->efi_size     = src_efi_fmt_32->efi_size;
 276                 dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
 277                 dst_efi_fmt->efi_id       = src_efi_fmt_32->efi_id;
 278                 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
 279                         dst_efi_fmt->efi_extents[i].ext_start =
 280                                 src_efi_fmt_32->efi_extents[i].ext_start;
 281                         dst_efi_fmt->efi_extents[i].ext_len =
 282                                 src_efi_fmt_32->efi_extents[i].ext_len;
 283                 }
 284                 return 0;
 285         } else if (buf->i_len == len64) {
 286                 xfs_efi_log_format_64_t *src_efi_fmt_64 = buf->i_addr;
 287
 288                 dst_efi_fmt->efi_type     = src_efi_fmt_64->efi_type;
 289                 dst_efi_fmt->efi_size     = src_efi_fmt_64->efi_size;
 290                 dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
 291                 dst_efi_fmt->efi_id       = src_efi_fmt_64->efi_id;
 292                 for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
 293                         dst_efi_fmt->efi_extents[i].ext_start =
 294                                 src_efi_fmt_64->efi_extents[i].ext_start;
 295                         dst_efi_fmt->efi_extents[i].ext_len =
 296                                 src_efi_fmt_64->efi_extents[i].ext_len;
 297                 }
 298                 return 0;
 299         }
 300         return -EFSCORRUPTED;
 301 }
 302
 303 /*
 304  * This is called by the efd item code below to release references to the given
 305  * efi item.  Each efd calls this with the number of extents that it has
 306  * logged, and when the sum of these reaches the total number of extents logged
 307  * by this efi item we can free the efi item.
 308  */
 309 void
 310 xfs_efi_release(xfs_efi_log_item_t      *efip,
 311                 uint                    nextents)
 312 {
 313         ASSERT(atomic_read(&efip->efi_next_extent) >= nextents);
 314         if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) {
 315                 /* recovery needs us to drop the EFI reference, too */
 316                 if (test_bit(XFS_EFI_RECOVERED, &efip->efi_flags))
 317                         __xfs_efi_release(efip);
 318
 319                 __xfs_efi_release(efip);
 320                 /* efip may now have been freed, do not reference it again. */
 321         }
 322 }
 323
 324 static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
 325 {
 326         return container_of(lip, struct xfs_efd_log_item, efd_item);
 327 }
 328
 329 STATIC void
 330 xfs_efd_item_free(struct xfs_efd_log_item *efdp)
 331 {
 332         if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS)
 333                 kmem_free(efdp);
 334         else
 335                 kmem_zone_free(xfs_efd_zone, efdp);
 336 }
 337
 338 /*
 339  * This returns the number of iovecs needed to log the given efd item.
 340  * We only need 1 iovec for an efd item.  It just logs the efd_log_format
 341  * structure.
 342  */
 343 static inline int
 344 xfs_efd_item_sizeof(
 345         struct xfs_efd_log_item *efdp)
 346 {
 347         return sizeof(xfs_efd_log_format_t) +
 348                (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
 349 }
 350
 351 STATIC void
 352 xfs_efd_item_size(
 353         struct xfs_log_item     *lip,
 354         int                     *nvecs,
 355         int                     *nbytes)
 356 {
 357         *nvecs += 1;
 358         *nbytes += xfs_efd_item_sizeof(EFD_ITEM(lip));
 359 }
 360
 361 /*
 362  * This is called to fill in the vector of log iovecs for the
 363  * given efd log item. We use only 1 iovec, and we point that
 364  * at the efd_log_format structure embedded in the efd item.
 365  * It is at this point that we assert that all of the extent
 366  * slots in the efd item have been filled.
 367  */
 368 STATIC void
 369 xfs_efd_item_format(
 370         struct xfs_log_item     *lip,
 371         struct xfs_log_vec      *lv)
 372 {
 373         struct xfs_efd_log_item *efdp = EFD_ITEM(lip);
 374         struct xfs_log_iovec    *vecp = NULL;
 375
 376         ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
 377
 378         efdp->efd_format.efd_type = XFS_LI_EFD;
 379         efdp->efd_format.efd_size = 1;
 380
 381         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFD_FORMAT,
 382                         &efdp->efd_format,
 383                         xfs_efd_item_sizeof(efdp));
 384 }
 385
 386 /*
 387  * Pinning has no meaning for an efd item, so just return.
 388  */
 389 STATIC void
 390 xfs_efd_item_pin(
 391         struct xfs_log_item     *lip)
 392 {
 393 }
 394
 395 /*
 396  * Since pinning has no meaning for an efd item, unpinning does
 397  * not either.
 398  */
 399 STATIC void
 400 xfs_efd_item_unpin(
 401         struct xfs_log_item     *lip,
 402         int                     remove)
 403 {
 404 }
 405
 406 /*
 407  * There isn't much you can do to push on an efd item.  It is simply stuck
 408  * waiting for the log to be flushed to disk.
 409  */
 410 STATIC uint
 411 xfs_efd_item_push(
 412         struct xfs_log_item     *lip,
 413         struct list_head        *buffer_list)
 414 {
 415         return XFS_ITEM_PINNED;
 416 }
 417
 418 STATIC void
 419 xfs_efd_item_unlock(
 420         struct xfs_log_item     *lip)
 421 {
 422         if (lip->li_flags & XFS_LI_ABORTED)
 423                 xfs_efd_item_free(EFD_ITEM(lip));
 424 }
 425
 426 /*
 427  * When the efd item is committed to disk, all we need to do
 428  * is delete our reference to our partner efi item and then
 429  * free ourselves.  Since we're freeing ourselves we must
 430  * return -1 to keep the transaction code from further referencing
 431  * this item.
 432  */
 433 STATIC xfs_lsn_t
 434 xfs_efd_item_committed(
 435         struct xfs_log_item     *lip,
 436         xfs_lsn_t               lsn)
 437 {
 438         struct xfs_efd_log_item *efdp = EFD_ITEM(lip);
 439
 440         /*
 441          * If we got a log I/O error, it's always the case that the LR with the
 442          * EFI got unpinned and freed before the EFD got aborted.
 443          */
 444         if (!(lip->li_flags & XFS_LI_ABORTED))
 445                 xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
 446
 447         xfs_efd_item_free(efdp);
 448         return (xfs_lsn_t)-1;
 449 }
 450
 451 /*
 452  * The EFD dependency tracking op doesn't do squat.  It can't because
 453  * it doesn't know where the free extent is coming from.  The dependency
 454  * tracking has to be handled by the "enclosing" metadata object.  For
 455  * example, for inodes, the inode is locked throughout the extent freeing
 456  * so the dependency should be recorded there.
 457  */
 458 STATIC void
 459 xfs_efd_item_committing(
 460         struct xfs_log_item     *lip,
 461         xfs_lsn_t               lsn)
 462 {
 463 }
 464
 465 /*
 466  * This is the ops vector shared by all efd log items.
 467  */
 468 static const struct xfs_item_ops xfs_efd_item_ops = {
 469         .iop_size       = xfs_efd_item_size,
 470         .iop_format     = xfs_efd_item_format,
 471         .iop_pin        = xfs_efd_item_pin,
 472         .iop_unpin      = xfs_efd_item_unpin,
 473         .iop_unlock     = xfs_efd_item_unlock,
 474         .iop_committed  = xfs_efd_item_committed,
 475         .iop_push       = xfs_efd_item_push,
 476         .iop_committing = xfs_efd_item_committing
 477 };
 478
 479 /*
 480  * Allocate and initialize an efd item with the given number of extents.
 481  */
 482 struct xfs_efd_log_item *
 483 xfs_efd_init(
 484         struct xfs_mount        *mp,
 485         struct xfs_efi_log_item *efip,
 486         uint                    nextents)
 487
 488 {
 489         struct xfs_efd_log_item *efdp;
 490         uint                    size;
 491
 492         ASSERT(nextents > 0);
 493         if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
 494                 size = (uint)(sizeof(xfs_efd_log_item_t) +
 495                         ((nextents - 1) * sizeof(xfs_extent_t)));
 496                 efdp = kmem_zalloc(size, KM_SLEEP);
 497         } else {
 498                 efdp = kmem_zone_zalloc(xfs_efd_zone, KM_SLEEP);
 499         }
 500
 501         xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops);
 502         efdp->efd_efip = efip;
 503         efdp->efd_format.efd_nextents = nextents;
 504         efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
 505
 506         return efdp;
 507 }