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