fs/xfs/xfs_trans_resv.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * Copyright (C) 2010 Red Hat, Inc.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write the Free Software Foundation,
  17  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 #include "xfs.h"
  20 #include "xfs_fs.h"
  21 #include "xfs_shared.h"
  22 #include "xfs_format.h"
  23 #include "xfs_log_format.h"
  24 #include "xfs_trans_resv.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_da_format.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_ialloc.h"
  32 #include "xfs_quota.h"
  33 #include "xfs_trans.h"
  34 #include "xfs_qm.h"
  35 #include "xfs_trans_space.h"
  36 #include "xfs_trace.h"
  37
  38 /*
  39  * A buffer has a format structure overhead in the log in addition
  40  * to the data, so we need to take this into account when reserving
  41  * space in a transaction for a buffer.  Round the space required up
  42  * to a multiple of 128 bytes so that we don't change the historical
  43  * reservation that has been used for this overhead.
  44  */
  45 STATIC uint
  46 xfs_buf_log_overhead(void)
  47 {
  48         return round_up(sizeof(struct xlog_op_header) +
  49                         sizeof(struct xfs_buf_log_format), 128);
  50 }
  51
  52 /*
  53  * Calculate out transaction log reservation per item in bytes.
  54  *
  55  * The nbufs argument is used to indicate the number of items that
  56  * will be changed in a transaction.  size is used to tell how many
  57  * bytes should be reserved per item.
  58  */
  59 STATIC uint
  60 xfs_calc_buf_res(
  61         uint            nbufs,
  62         uint            size)
  63 {
  64         return nbufs * (size + xfs_buf_log_overhead());
  65 }
  66
  67 /*
  68  * Logging inodes is really tricksy. They are logged in memory format,
  69  * which means that what we write into the log doesn't directly translate into
  70  * the amount of space they use on disk.
  71  *
  72  * Case in point - btree format forks in memory format use more space than the
  73  * on-disk format. In memory, the buffer contains a normal btree block header so
  74  * the btree code can treat it as though it is just another generic buffer.
  75  * However, when we write it to the inode fork, we don't write all of this
  76  * header as it isn't needed. e.g. the root is only ever in the inode, so
  77  * there's no need for sibling pointers which would waste 16 bytes of space.
  78  *
  79  * Hence when we have an inode with a maximally sized btree format fork, then
  80  * amount of information we actually log is greater than the size of the inode
  81  * on disk. Hence we need an inode reservation function that calculates all this
  82  * correctly. So, we log:
  83  *
  84  * - 4 log op headers for object
  85  *      - for the ilf, the inode core and 2 forks
  86  * - inode log format object
  87  * - the inode core
  88  * - two inode forks containing bmap btree root blocks.
  89  *      - the btree data contained by both forks will fit into the inode size,
  90  *        hence when combined with the inode core above, we have a total of the
  91  *        actual inode size.
  92  *      - the BMBT headers need to be accounted separately, as they are
  93  *        additional to the records and pointers that fit inside the inode
  94  *        forks.
  95  */
  96 STATIC uint
  97 xfs_calc_inode_res(
  98         struct xfs_mount        *mp,
  99         uint                    ninodes)
 100 {
 101         return ninodes *
 102                 (4 * sizeof(struct xlog_op_header) +
 103                  sizeof(struct xfs_inode_log_format) +
 104                  mp->m_sb.sb_inodesize +
 105                  2 * XFS_BMBT_BLOCK_LEN(mp));
 106 }
 107
 108 /*
 109  * Various log reservation values.
 110  *
 111  * These are based on the size of the file system block because that is what
 112  * most transactions manipulate.  Each adds in an additional 128 bytes per
 113  * item logged to try to account for the overhead of the transaction mechanism.
 114  *
 115  * Note:  Most of the reservations underestimate the number of allocation
 116  * groups into which they could free extents in the xfs_bmap_finish() call.
 117  * This is because the number in the worst case is quite high and quite
 118  * unusual.  In order to fix this we need to change xfs_bmap_finish() to free
 119  * extents in only a single AG at a time.  This will require changes to the
 120  * EFI code as well, however, so that the EFI for the extents not freed is
 121  * logged again in each transaction.  See SGI PV #261917.
 122  *
 123  * Reservation functions here avoid a huge stack in xfs_trans_init due to
 124  * register overflow from temporaries in the calculations.
 125  */
 126
 127
 128 /*
 129  * In a write transaction we can allocate a maximum of 2
 130  * extents.  This gives:
 131  *    the inode getting the new extents: inode size
 132  *    the inode's bmap btree: max depth * block size
 133  *    the agfs of the ags from which the extents are allocated: 2 * sector
 134  *    the superblock free block counter: sector size
 135  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 136  * And the bmap_finish transaction can free bmap blocks in a join:
 137  *    the agfs of the ags containing the blocks: 2 * sector size
 138  *    the agfls of the ags containing the blocks: 2 * sector size
 139  *    the super block free block counter: sector size
 140  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 141  */
 142 STATIC uint
 143 xfs_calc_write_reservation(
 144         struct xfs_mount        *mp)
 145 {
 146         return XFS_DQUOT_LOGRES(mp) +
 147                 MAX((xfs_calc_inode_res(mp, 1) +
 148                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
 149                                       XFS_FSB_TO_B(mp, 1)) +
 150                      xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 151                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 152                                       XFS_FSB_TO_B(mp, 1))),
 153                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 154                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 155                                       XFS_FSB_TO_B(mp, 1))));
 156 }
 157
 158 /*
 159  * In truncating a file we free up to two extents at once.  We can modify:
 160  *    the inode being truncated: inode size
 161  *    the inode's bmap btree: (max depth + 1) * block size
 162  * And the bmap_finish transaction can free the blocks and bmap blocks:
 163  *    the agf for each of the ags: 4 * sector size
 164  *    the agfl for each of the ags: 4 * sector size
 165  *    the super block to reflect the freed blocks: sector size
 166  *    worst case split in allocation btrees per extent assuming 4 extents:
 167  *              4 exts * 2 trees * (2 * max depth - 1) * block size
 168  *    the inode btree: max depth * blocksize
 169  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 170  */
 171 STATIC uint
 172 xfs_calc_itruncate_reservation(
 173         struct xfs_mount        *mp)
 174 {
 175         return XFS_DQUOT_LOGRES(mp) +
 176                 MAX((xfs_calc_inode_res(mp, 1) +
 177                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1,
 178                                       XFS_FSB_TO_B(mp, 1))),
 179                     (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
 180                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4),
 181                                       XFS_FSB_TO_B(mp, 1)) +
 182                     xfs_calc_buf_res(5, 0) +
 183                     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 184                                      XFS_FSB_TO_B(mp, 1)) +
 185                     xfs_calc_buf_res(2 + mp->m_ialloc_blks +
 186                                      mp->m_in_maxlevels, 0)));
 187 }
 188
 189 /*
 190  * In renaming a files we can modify:
 191  *    the four inodes involved: 4 * inode size
 192  *    the two directory btrees: 2 * (max depth + v2) * dir block size
 193  *    the two directory bmap btrees: 2 * max depth * block size
 194  * And the bmap_finish transaction can free dir and bmap blocks (two sets
 195  *      of bmap blocks) giving:
 196  *    the agf for the ags in which the blocks live: 3 * sector size
 197  *    the agfl for the ags in which the blocks live: 3 * sector size
 198  *    the superblock for the free block count: sector size
 199  *    the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size
 200  */
 201 STATIC uint
 202 xfs_calc_rename_reservation(
 203         struct xfs_mount        *mp)
 204 {
 205         return XFS_DQUOT_LOGRES(mp) +
 206                 MAX((xfs_calc_inode_res(mp, 4) +
 207                      xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp),
 208                                       XFS_FSB_TO_B(mp, 1))),
 209                     (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) +
 210                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 3),
 211                                       XFS_FSB_TO_B(mp, 1))));
 212 }
 213
 214 /*
 215  * For removing an inode from unlinked list at first, we can modify:
 216  *    the agi hash list and counters: sector size
 217  *    the on disk inode before ours in the agi hash list: inode cluster size
 218  */
 219 STATIC uint
 220 xfs_calc_iunlink_remove_reservation(
 221         struct xfs_mount        *mp)
 222 {
 223         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 224                max_t(uint, XFS_FSB_TO_B(mp, 1), mp->m_inode_cluster_size);
 225 }
 226
 227 /*
 228  * For creating a link to an inode:
 229  *    the parent directory inode: inode size
 230  *    the linked inode: inode size
 231  *    the directory btree could split: (max depth + v2) * dir block size
 232  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 233  * And the bmap_finish transaction can free some bmap blocks giving:
 234  *    the agf for the ag in which the blocks live: sector size
 235  *    the agfl for the ag in which the blocks live: sector size
 236  *    the superblock for the free block count: sector size
 237  *    the allocation btrees: 2 trees * (2 * max depth - 1) * block size
 238  */
 239 STATIC uint
 240 xfs_calc_link_reservation(
 241         struct xfs_mount        *mp)
 242 {
 243         return XFS_DQUOT_LOGRES(mp) +
 244                 xfs_calc_iunlink_remove_reservation(mp) +
 245                 MAX((xfs_calc_inode_res(mp, 2) +
 246                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 247                                       XFS_FSB_TO_B(mp, 1))),
 248                     (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 249                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 250                                       XFS_FSB_TO_B(mp, 1))));
 251 }
 252
 253 /*
 254  * For adding an inode to unlinked list we can modify:
 255  *    the agi hash list: sector size
 256  *    the unlinked inode: inode size
 257  */
 258 STATIC uint
 259 xfs_calc_iunlink_add_reservation(xfs_mount_t *mp)
 260 {
 261         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 262                 xfs_calc_inode_res(mp, 1);
 263 }
 264
 265 /*
 266  * For removing a directory entry we can modify:
 267  *    the parent directory inode: inode size
 268  *    the removed inode: inode size
 269  *    the directory btree could join: (max depth + v2) * dir block size
 270  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 271  * And the bmap_finish transaction can free the dir and bmap blocks giving:
 272  *    the agf for the ag in which the blocks live: 2 * sector size
 273  *    the agfl for the ag in which the blocks live: 2 * sector size
 274  *    the superblock for the free block count: sector size
 275  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 276  */
 277 STATIC uint
 278 xfs_calc_remove_reservation(
 279         struct xfs_mount        *mp)
 280 {
 281         return XFS_DQUOT_LOGRES(mp) +
 282                 xfs_calc_iunlink_add_reservation(mp) +
 283                 MAX((xfs_calc_inode_res(mp, 1) +
 284                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 285                                       XFS_FSB_TO_B(mp, 1))),
 286                     (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) +
 287                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 288                                       XFS_FSB_TO_B(mp, 1))));
 289 }
 290
 291 /*
 292  * For create, break it in to the two cases that the transaction
 293  * covers. We start with the modify case - allocation done by modification
 294  * of the state of existing inodes - and the allocation case.
 295  */
 296
 297 /*
 298  * For create we can modify:
 299  *    the parent directory inode: inode size
 300  *    the new inode: inode size
 301  *    the inode btree entry: block size
 302  *    the superblock for the nlink flag: sector size
 303  *    the directory btree: (max depth + v2) * dir block size
 304  *    the directory inode's bmap btree: (max depth + v2) * block size
 305  */
 306 STATIC uint
 307 xfs_calc_create_resv_modify(
 308         struct xfs_mount        *mp)
 309 {
 310         return xfs_calc_inode_res(mp, 2) +
 311                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 312                 (uint)XFS_FSB_TO_B(mp, 1) +
 313                 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1));
 314 }
 315
 316 /*
 317  * For create we can allocate some inodes giving:
 318  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 319  *    the superblock for the nlink flag: sector size
 320  *    the inode blocks allocated: mp->m_ialloc_blks * blocksize
 321  *    the inode btree: max depth * blocksize
 322  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 323  */
 324 STATIC uint
 325 xfs_calc_create_resv_alloc(
 326         struct xfs_mount        *mp)
 327 {
 328         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 329                 mp->m_sb.sb_sectsize +
 330                 xfs_calc_buf_res(mp->m_ialloc_blks, XFS_FSB_TO_B(mp, 1)) +
 331                 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) +
 332                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 333                                  XFS_FSB_TO_B(mp, 1));
 334 }
 335
 336 STATIC uint
 337 __xfs_calc_create_reservation(
 338         struct xfs_mount        *mp)
 339 {
 340         return XFS_DQUOT_LOGRES(mp) +
 341                 MAX(xfs_calc_create_resv_alloc(mp),
 342                     xfs_calc_create_resv_modify(mp));
 343 }
 344
 345 /*
 346  * For icreate we can allocate some inodes giving:
 347  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 348  *    the superblock for the nlink flag: sector size
 349  *    the inode btree: max depth * blocksize
 350  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 351  */
 352 STATIC uint
 353 xfs_calc_icreate_resv_alloc(
 354         struct xfs_mount        *mp)
 355 {
 356         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 357                 mp->m_sb.sb_sectsize +
 358                 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) +
 359                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 360                                  XFS_FSB_TO_B(mp, 1));
 361 }
 362
 363 STATIC uint
 364 xfs_calc_icreate_reservation(xfs_mount_t *mp)
 365 {
 366         return XFS_DQUOT_LOGRES(mp) +
 367                 MAX(xfs_calc_icreate_resv_alloc(mp),
 368                     xfs_calc_create_resv_modify(mp));
 369 }
 370
 371 STATIC uint
 372 xfs_calc_create_reservation(
 373         struct xfs_mount        *mp)
 374 {
 375         if (xfs_sb_version_hascrc(&mp->m_sb))
 376                 return xfs_calc_icreate_reservation(mp);
 377         return __xfs_calc_create_reservation(mp);
 378
 379 }
 380
 381 STATIC uint
 382 xfs_calc_create_tmpfile_reservation(
 383         struct xfs_mount        *mp)
 384 {
 385         uint    res = XFS_DQUOT_LOGRES(mp);
 386
 387         if (xfs_sb_version_hascrc(&mp->m_sb))
 388                 res += xfs_calc_icreate_resv_alloc(mp);
 389         else
 390                 res += xfs_calc_create_resv_alloc(mp);
 391
 392         return res + xfs_calc_iunlink_add_reservation(mp);
 393 }
 394
 395 /*
 396  * Making a new directory is the same as creating a new file.
 397  */
 398 STATIC uint
 399 xfs_calc_mkdir_reservation(
 400         struct xfs_mount        *mp)
 401 {
 402         return xfs_calc_create_reservation(mp);
 403 }
 404
 405
 406 /*
 407  * Making a new symplink is the same as creating a new file, but
 408  * with the added blocks for remote symlink data which can be up to 1kB in
 409  * length (MAXPATHLEN).
 410  */
 411 STATIC uint
 412 xfs_calc_symlink_reservation(
 413         struct xfs_mount        *mp)
 414 {
 415         return xfs_calc_create_reservation(mp) +
 416                xfs_calc_buf_res(1, MAXPATHLEN);
 417 }
 418
 419 /*
 420  * In freeing an inode we can modify:
 421  *    the inode being freed: inode size
 422  *    the super block free inode counter: sector size
 423  *    the agi hash list and counters: sector size
 424  *    the inode btree entry: block size
 425  *    the on disk inode before ours in the agi hash list: inode cluster size
 426  *    the inode btree: max depth * blocksize
 427  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 428  */
 429 STATIC uint
 430 xfs_calc_ifree_reservation(
 431         struct xfs_mount        *mp)
 432 {
 433         return XFS_DQUOT_LOGRES(mp) +
 434                 xfs_calc_inode_res(mp, 1) +
 435                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 436                 xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) +
 437                 xfs_calc_iunlink_remove_reservation(mp) +
 438                 xfs_calc_buf_res(1, 0) +
 439                 xfs_calc_buf_res(2 + mp->m_ialloc_blks +
 440                                  mp->m_in_maxlevels, 0) +
 441                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 442                                  XFS_FSB_TO_B(mp, 1));
 443 }
 444
 445 /*
 446  * When only changing the inode we log the inode and possibly the superblock
 447  * We also add a bit of slop for the transaction stuff.
 448  */
 449 STATIC uint
 450 xfs_calc_ichange_reservation(
 451         struct xfs_mount        *mp)
 452 {
 453         return XFS_DQUOT_LOGRES(mp) +
 454                 xfs_calc_inode_res(mp, 1) +
 455                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 456
 457 }
 458
 459 /*
 460  * Growing the data section of the filesystem.
 461  *      superblock
 462  *      agi and agf
 463  *      allocation btrees
 464  */
 465 STATIC uint
 466 xfs_calc_growdata_reservation(
 467         struct xfs_mount        *mp)
 468 {
 469         return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 470                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 471                                  XFS_FSB_TO_B(mp, 1));
 472 }
 473
 474 /*
 475  * Growing the rt section of the filesystem.
 476  * In the first set of transactions (ALLOC) we allocate space to the
 477  * bitmap or summary files.
 478  *      superblock: sector size
 479  *      agf of the ag from which the extent is allocated: sector size
 480  *      bmap btree for bitmap/summary inode: max depth * blocksize
 481  *      bitmap/summary inode: inode size
 482  *      allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize
 483  */
 484 STATIC uint
 485 xfs_calc_growrtalloc_reservation(
 486         struct xfs_mount        *mp)
 487 {
 488         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 489                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
 490                                  XFS_FSB_TO_B(mp, 1)) +
 491                 xfs_calc_inode_res(mp, 1) +
 492                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 493                                  XFS_FSB_TO_B(mp, 1));
 494 }
 495
 496 /*
 497  * Growing the rt section of the filesystem.
 498  * In the second set of transactions (ZERO) we zero the new metadata blocks.
 499  *      one bitmap/summary block: blocksize
 500  */
 501 STATIC uint
 502 xfs_calc_growrtzero_reservation(
 503         struct xfs_mount        *mp)
 504 {
 505         return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize);
 506 }
 507
 508 /*
 509  * Growing the rt section of the filesystem.
 510  * In the third set of transactions (FREE) we update metadata without
 511  * allocating any new blocks.
 512  *      superblock: sector size
 513  *      bitmap inode: inode size
 514  *      summary inode: inode size
 515  *      one bitmap block: blocksize
 516  *      summary blocks: new summary size
 517  */
 518 STATIC uint
 519 xfs_calc_growrtfree_reservation(
 520         struct xfs_mount        *mp)
 521 {
 522         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 523                 xfs_calc_inode_res(mp, 2) +
 524                 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) +
 525                 xfs_calc_buf_res(1, mp->m_rsumsize);
 526 }
 527
 528 /*
 529  * Logging the inode modification timestamp on a synchronous write.
 530  *      inode
 531  */
 532 STATIC uint
 533 xfs_calc_swrite_reservation(
 534         struct xfs_mount        *mp)
 535 {
 536         return xfs_calc_inode_res(mp, 1);
 537 }
 538
 539 /*
 540  * Logging the inode mode bits when writing a setuid/setgid file
 541  *      inode
 542  */
 543 STATIC uint
 544 xfs_calc_writeid_reservation(
 545         struct xfs_mount        *mp)
 546 {
 547         return xfs_calc_inode_res(mp, 1);
 548 }
 549
 550 /*
 551  * Converting the inode from non-attributed to attributed.
 552  *      the inode being converted: inode size
 553  *      agf block and superblock (for block allocation)
 554  *      the new block (directory sized)
 555  *      bmap blocks for the new directory block
 556  *      allocation btrees
 557  */
 558 STATIC uint
 559 xfs_calc_addafork_reservation(
 560         struct xfs_mount        *mp)
 561 {
 562         return XFS_DQUOT_LOGRES(mp) +
 563                 xfs_calc_inode_res(mp, 1) +
 564                 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 565                 xfs_calc_buf_res(1, mp->m_dirblksize) +
 566                 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1,
 567                                  XFS_FSB_TO_B(mp, 1)) +
 568                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 569                                  XFS_FSB_TO_B(mp, 1));
 570 }
 571
 572 /*
 573  * Removing the attribute fork of a file
 574  *    the inode being truncated: inode size
 575  *    the inode's bmap btree: max depth * block size
 576  * And the bmap_finish transaction can free the blocks and bmap blocks:
 577  *    the agf for each of the ags: 4 * sector size
 578  *    the agfl for each of the ags: 4 * sector size
 579  *    the super block to reflect the freed blocks: sector size
 580  *    worst case split in allocation btrees per extent assuming 4 extents:
 581  *              4 exts * 2 trees * (2 * max depth - 1) * block size
 582  */
 583 STATIC uint
 584 xfs_calc_attrinval_reservation(
 585         struct xfs_mount        *mp)
 586 {
 587         return MAX((xfs_calc_inode_res(mp, 1) +
 588                     xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 589                                      XFS_FSB_TO_B(mp, 1))),
 590                    (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
 591                     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4),
 592                                      XFS_FSB_TO_B(mp, 1))));
 593 }
 594
 595 /*
 596  * Setting an attribute at mount time.
 597  *      the inode getting the attribute
 598  *      the superblock for allocations
 599  *      the agfs extents are allocated from
 600  *      the attribute btree * max depth
 601  *      the inode allocation btree
 602  * Since attribute transaction space is dependent on the size of the attribute,
 603  * the calculation is done partially at mount time and partially at runtime(see
 604  * below).
 605  */
 606 STATIC uint
 607 xfs_calc_attrsetm_reservation(
 608         struct xfs_mount        *mp)
 609 {
 610         return XFS_DQUOT_LOGRES(mp) +
 611                 xfs_calc_inode_res(mp, 1) +
 612                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 613                 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1));
 614 }
 615
 616 /*
 617  * Setting an attribute at runtime, transaction space unit per block.
 618  *      the superblock for allocations: sector size
 619  *      the inode bmap btree could join or split: max depth * block size
 620  * Since the runtime attribute transaction space is dependent on the total
 621  * blocks needed for the 1st bmap, here we calculate out the space unit for
 622  * one block so that the caller could figure out the total space according
 623  * to the attibute extent length in blocks by:
 624  *      ext * M_RES(mp)->tr_attrsetrt.tr_logres
 625  */
 626 STATIC uint
 627 xfs_calc_attrsetrt_reservation(
 628         struct xfs_mount        *mp)
 629 {
 630         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 631                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 632                                  XFS_FSB_TO_B(mp, 1));
 633 }
 634
 635 /*
 636  * Removing an attribute.
 637  *    the inode: inode size
 638  *    the attribute btree could join: max depth * block size
 639  *    the inode bmap btree could join or split: max depth * block size
 640  * And the bmap_finish transaction can free the attr blocks freed giving:
 641  *    the agf for the ag in which the blocks live: 2 * sector size
 642  *    the agfl for the ag in which the blocks live: 2 * sector size
 643  *    the superblock for the free block count: sector size
 644  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 645  */
 646 STATIC uint
 647 xfs_calc_attrrm_reservation(
 648         struct xfs_mount        *mp)
 649 {
 650         return XFS_DQUOT_LOGRES(mp) +
 651                 MAX((xfs_calc_inode_res(mp, 1) +
 652                      xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH,
 653                                       XFS_FSB_TO_B(mp, 1)) +
 654                      (uint)XFS_FSB_TO_B(mp,
 655                                         XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
 656                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)),
 657                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 658                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 659                                       XFS_FSB_TO_B(mp, 1))));
 660 }
 661
 662 /*
 663  * Clearing a bad agino number in an agi hash bucket.
 664  */
 665 STATIC uint
 666 xfs_calc_clear_agi_bucket_reservation(
 667         struct xfs_mount        *mp)
 668 {
 669         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 670 }
 671
 672 /*
 673  * Clearing the quotaflags in the superblock.
 674  *      the super block for changing quota flags: sector size
 675  */
 676 STATIC uint
 677 xfs_calc_qm_sbchange_reservation(
 678         struct xfs_mount        *mp)
 679 {
 680         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 681 }
 682
 683 /*
 684  * Adjusting quota limits.
 685  *    the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot)
 686  */
 687 STATIC uint
 688 xfs_calc_qm_setqlim_reservation(
 689         struct xfs_mount        *mp)
 690 {
 691         return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot));
 692 }
 693
 694 /*
 695  * Allocating quota on disk if needed.
 696  *      the write transaction log space for quota file extent allocation
 697  *      the unit of quota allocation: one system block size
 698  */
 699 STATIC uint
 700 xfs_calc_qm_dqalloc_reservation(
 701         struct xfs_mount        *mp)
 702 {
 703         return xfs_calc_write_reservation(mp) +
 704                 xfs_calc_buf_res(1,
 705                         XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
 706 }
 707
 708 /*
 709  * Turning off quotas.
 710  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 711  *    the superblock for the quota flags: sector size
 712  */
 713 STATIC uint
 714 xfs_calc_qm_quotaoff_reservation(
 715         struct xfs_mount        *mp)
 716 {
 717         return sizeof(struct xfs_qoff_logitem) * 2 +
 718                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 719 }
 720
 721 /*
 722  * End of turning off quotas.
 723  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 724  */
 725 STATIC uint
 726 xfs_calc_qm_quotaoff_end_reservation(
 727         struct xfs_mount        *mp)
 728 {
 729         return sizeof(struct xfs_qoff_logitem) * 2;
 730 }
 731
 732 /*
 733  * Syncing the incore super block changes to disk.
 734  *     the super block to reflect the changes: sector size
 735  */
 736 STATIC uint
 737 xfs_calc_sb_reservation(
 738         struct xfs_mount        *mp)
 739 {
 740         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 741 }
 742
 743 void
 744 xfs_trans_resv_calc(
 745         struct xfs_mount        *mp,
 746         struct xfs_trans_resv   *resp)
 747 {
 748         /*
 749          * The following transactions are logged in physical format and
 750          * require a permanent reservation on space.
 751          */
 752         resp->tr_write.tr_logres = xfs_calc_write_reservation(mp);
 753         resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT;
 754         resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 755
 756         resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp);
 757         resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT;
 758         resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 759
 760         resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp);
 761         resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT;
 762         resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 763
 764         resp->tr_link.tr_logres = xfs_calc_link_reservation(mp);
 765         resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT;
 766         resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 767
 768         resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp);
 769         resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT;
 770         resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 771
 772         resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp);
 773         resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT;
 774         resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 775
 776         resp->tr_create.tr_logres = xfs_calc_create_reservation(mp);
 777         resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT;
 778         resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 779
 780         resp->tr_create_tmpfile.tr_logres =
 781                         xfs_calc_create_tmpfile_reservation(mp);
 782         resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT;
 783         resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 784
 785         resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);
 786         resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT;
 787         resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 788
 789         resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp);
 790         resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT;
 791         resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 792
 793         resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp);
 794         resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT;
 795         resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 796
 797         resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp);
 798         resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT;
 799         resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 800
 801         resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp);
 802         resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT;
 803         resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 804
 805         resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp);
 806         resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT;
 807         resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 808
 809         resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp);
 810         resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT;
 811         resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 812
 813         resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp);
 814         resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT;
 815         resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 816
 817         /*
 818          * The following transactions are logged in logical format with
 819          * a default log count.
 820          */
 821         resp->tr_qm_sbchange.tr_logres = xfs_calc_qm_sbchange_reservation(mp);
 822         resp->tr_qm_sbchange.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 823
 824         resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(mp);
 825         resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 826
 827         resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp);
 828         resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 829
 830         resp->tr_qm_equotaoff.tr_logres =
 831                 xfs_calc_qm_quotaoff_end_reservation(mp);
 832         resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 833
 834         resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
 835         resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 836
 837         /* The following transaction are logged in logical format */
 838         resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp);
 839         resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp);
 840         resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp);
 841         resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp);
 842         resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp);
 843         resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp);
 844         resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp);
 845         resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp);
 846 }