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  * - log op headers for object
  85  * - inode log format object
  86  * - the entire inode contents (core + 2 forks)
  87  * - two bmap btree block headers
  88  */
  89 STATIC uint
  90 xfs_calc_inode_res(
  91         struct xfs_mount        *mp,
  92         uint                    ninodes)
  93 {
  94         return ninodes * (sizeof(struct xlog_op_header) +
  95                           sizeof(struct xfs_inode_log_format) +
  96                           mp->m_sb.sb_inodesize +
  97                           2 * XFS_BMBT_BLOCK_LEN(mp));
  98 }
  99
 100 /*
 101  * Various log reservation values.
 102  *
 103  * These are based on the size of the file system block because that is what
 104  * most transactions manipulate.  Each adds in an additional 128 bytes per
 105  * item logged to try to account for the overhead of the transaction mechanism.
 106  *
 107  * Note:  Most of the reservations underestimate the number of allocation
 108  * groups into which they could free extents in the xfs_bmap_finish() call.
 109  * This is because the number in the worst case is quite high and quite
 110  * unusual.  In order to fix this we need to change xfs_bmap_finish() to free
 111  * extents in only a single AG at a time.  This will require changes to the
 112  * EFI code as well, however, so that the EFI for the extents not freed is
 113  * logged again in each transaction.  See SGI PV #261917.
 114  *
 115  * Reservation functions here avoid a huge stack in xfs_trans_init due to
 116  * register overflow from temporaries in the calculations.
 117  */
 118
 119
 120 /*
 121  * In a write transaction we can allocate a maximum of 2
 122  * extents.  This gives:
 123  *    the inode getting the new extents: inode size
 124  *    the inode's bmap btree: max depth * block size
 125  *    the agfs of the ags from which the extents are allocated: 2 * sector
 126  *    the superblock free block counter: sector size
 127  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 128  * And the bmap_finish transaction can free bmap blocks in a join:
 129  *    the agfs of the ags containing the blocks: 2 * sector size
 130  *    the agfls of the ags containing the blocks: 2 * sector size
 131  *    the super block free block counter: sector size
 132  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 133  */
 134 STATIC uint
 135 xfs_calc_write_reservation(
 136         struct xfs_mount        *mp)
 137 {
 138         return XFS_DQUOT_LOGRES(mp) +
 139                 MAX((xfs_calc_inode_res(mp, 1) +
 140                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
 141                                       XFS_FSB_TO_B(mp, 1)) +
 142                      xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 143                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 144                                       XFS_FSB_TO_B(mp, 1))),
 145                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 146                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 147                                       XFS_FSB_TO_B(mp, 1))));
 148 }
 149
 150 /*
 151  * In truncating a file we free up to two extents at once.  We can modify:
 152  *    the inode being truncated: inode size
 153  *    the inode's bmap btree: (max depth + 1) * block size
 154  * And the bmap_finish transaction can free the blocks and bmap blocks:
 155  *    the agf for each of the ags: 4 * sector size
 156  *    the agfl for each of the ags: 4 * sector size
 157  *    the super block to reflect the freed blocks: sector size
 158  *    worst case split in allocation btrees per extent assuming 4 extents:
 159  *              4 exts * 2 trees * (2 * max depth - 1) * block size
 160  *    the inode btree: max depth * blocksize
 161  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 162  */
 163 STATIC uint
 164 xfs_calc_itruncate_reservation(
 165         struct xfs_mount        *mp)
 166 {
 167         return XFS_DQUOT_LOGRES(mp) +
 168                 MAX((xfs_calc_inode_res(mp, 1) +
 169                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1,
 170                                       XFS_FSB_TO_B(mp, 1))),
 171                     (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
 172                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4),
 173                                       XFS_FSB_TO_B(mp, 1)) +
 174                     xfs_calc_buf_res(5, 0) +
 175                     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 176                                      XFS_FSB_TO_B(mp, 1)) +
 177                     xfs_calc_buf_res(2 + XFS_IALLOC_BLOCKS(mp) +
 178                                      mp->m_in_maxlevels, 0)));
 179 }
 180
 181 /*
 182  * In renaming a files we can modify:
 183  *    the four inodes involved: 4 * inode size
 184  *    the two directory btrees: 2 * (max depth + v2) * dir block size
 185  *    the two directory bmap btrees: 2 * max depth * block size
 186  * And the bmap_finish transaction can free dir and bmap blocks (two sets
 187  *      of bmap blocks) giving:
 188  *    the agf for the ags in which the blocks live: 3 * sector size
 189  *    the agfl for the ags in which the blocks live: 3 * sector size
 190  *    the superblock for the free block count: sector size
 191  *    the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size
 192  */
 193 STATIC uint
 194 xfs_calc_rename_reservation(
 195         struct xfs_mount        *mp)
 196 {
 197         return XFS_DQUOT_LOGRES(mp) +
 198                 MAX((xfs_calc_inode_res(mp, 4) +
 199                      xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp),
 200                                       XFS_FSB_TO_B(mp, 1))),
 201                     (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) +
 202                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 3),
 203                                       XFS_FSB_TO_B(mp, 1))));
 204 }
 205
 206 /*
 207  * For creating a link to an inode:
 208  *    the parent directory inode: inode size
 209  *    the linked inode: inode size
 210  *    the directory btree could split: (max depth + v2) * dir block size
 211  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 212  * And the bmap_finish transaction can free some bmap blocks giving:
 213  *    the agf for the ag in which the blocks live: sector size
 214  *    the agfl for the ag in which the blocks live: sector size
 215  *    the superblock for the free block count: sector size
 216  *    the allocation btrees: 2 trees * (2 * max depth - 1) * block size
 217  */
 218 STATIC uint
 219 xfs_calc_link_reservation(
 220         struct xfs_mount        *mp)
 221 {
 222         return XFS_DQUOT_LOGRES(mp) +
 223                 MAX((xfs_calc_inode_res(mp, 2) +
 224                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 225                                       XFS_FSB_TO_B(mp, 1))),
 226                     (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 227                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 228                                       XFS_FSB_TO_B(mp, 1))));
 229 }
 230
 231 /*
 232  * For removing a directory entry we can modify:
 233  *    the parent directory inode: inode size
 234  *    the removed inode: inode size
 235  *    the directory btree could join: (max depth + v2) * dir block size
 236  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 237  * And the bmap_finish transaction can free the dir and bmap blocks giving:
 238  *    the agf for the ag in which the blocks live: 2 * sector size
 239  *    the agfl for the ag in which the blocks live: 2 * sector size
 240  *    the superblock for the free block count: sector size
 241  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 242  */
 243 STATIC uint
 244 xfs_calc_remove_reservation(
 245         struct xfs_mount        *mp)
 246 {
 247         return XFS_DQUOT_LOGRES(mp) +
 248                 MAX((xfs_calc_inode_res(mp, 2) +
 249                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 250                                       XFS_FSB_TO_B(mp, 1))),
 251                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 252                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 253                                       XFS_FSB_TO_B(mp, 1))));
 254 }
 255
 256 /*
 257  * For create, break it in to the two cases that the transaction
 258  * covers. We start with the modify case - allocation done by modification
 259  * of the state of existing inodes - and the allocation case.
 260  */
 261
 262 /*
 263  * For create we can modify:
 264  *    the parent directory inode: inode size
 265  *    the new inode: inode size
 266  *    the inode btree entry: block size
 267  *    the superblock for the nlink flag: sector size
 268  *    the directory btree: (max depth + v2) * dir block size
 269  *    the directory inode's bmap btree: (max depth + v2) * block size
 270  */
 271 STATIC uint
 272 xfs_calc_create_resv_modify(
 273         struct xfs_mount        *mp)
 274 {
 275         return xfs_calc_inode_res(mp, 2) +
 276                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 277                 (uint)XFS_FSB_TO_B(mp, 1) +
 278                 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1));
 279 }
 280
 281 /*
 282  * For create we can allocate some inodes giving:
 283  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 284  *    the superblock for the nlink flag: sector size
 285  *    the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize
 286  *    the inode btree: max depth * blocksize
 287  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 288  */
 289 STATIC uint
 290 xfs_calc_create_resv_alloc(
 291         struct xfs_mount        *mp)
 292 {
 293         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 294                 mp->m_sb.sb_sectsize +
 295                 xfs_calc_buf_res(XFS_IALLOC_BLOCKS(mp), XFS_FSB_TO_B(mp, 1)) +
 296                 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) +
 297                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 298                                  XFS_FSB_TO_B(mp, 1));
 299 }
 300
 301 STATIC uint
 302 __xfs_calc_create_reservation(
 303         struct xfs_mount        *mp)
 304 {
 305         return XFS_DQUOT_LOGRES(mp) +
 306                 MAX(xfs_calc_create_resv_alloc(mp),
 307                     xfs_calc_create_resv_modify(mp));
 308 }
 309
 310 /*
 311  * For icreate we can allocate some inodes giving:
 312  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 313  *    the superblock for the nlink flag: sector size
 314  *    the inode btree: max depth * blocksize
 315  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 316  */
 317 STATIC uint
 318 xfs_calc_icreate_resv_alloc(
 319         struct xfs_mount        *mp)
 320 {
 321         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 322                 mp->m_sb.sb_sectsize +
 323                 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) +
 324                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 325                                  XFS_FSB_TO_B(mp, 1));
 326 }
 327
 328 STATIC uint
 329 xfs_calc_icreate_reservation(xfs_mount_t *mp)
 330 {
 331         return XFS_DQUOT_LOGRES(mp) +
 332                 MAX(xfs_calc_icreate_resv_alloc(mp),
 333                     xfs_calc_create_resv_modify(mp));
 334 }
 335
 336 STATIC uint
 337 xfs_calc_create_reservation(
 338         struct xfs_mount        *mp)
 339 {
 340         if (xfs_sb_version_hascrc(&mp->m_sb))
 341                 return xfs_calc_icreate_reservation(mp);
 342         return __xfs_calc_create_reservation(mp);
 343
 344 }
 345
 346 /*
 347  * Making a new directory is the same as creating a new file.
 348  */
 349 STATIC uint
 350 xfs_calc_mkdir_reservation(
 351         struct xfs_mount        *mp)
 352 {
 353         return xfs_calc_create_reservation(mp);
 354 }
 355
 356
 357 /*
 358  * Making a new symplink is the same as creating a new file, but
 359  * with the added blocks for remote symlink data which can be up to 1kB in
 360  * length (MAXPATHLEN).
 361  */
 362 STATIC uint
 363 xfs_calc_symlink_reservation(
 364         struct xfs_mount        *mp)
 365 {
 366         return xfs_calc_create_reservation(mp) +
 367                xfs_calc_buf_res(1, MAXPATHLEN);
 368 }
 369
 370 /*
 371  * In freeing an inode we can modify:
 372  *    the inode being freed: inode size
 373  *    the super block free inode counter: sector size
 374  *    the agi hash list and counters: sector size
 375  *    the inode btree entry: block size
 376  *    the on disk inode before ours in the agi hash list: inode cluster size
 377  *    the inode btree: max depth * blocksize
 378  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 379  */
 380 STATIC uint
 381 xfs_calc_ifree_reservation(
 382         struct xfs_mount        *mp)
 383 {
 384         return XFS_DQUOT_LOGRES(mp) +
 385                 xfs_calc_inode_res(mp, 1) +
 386                 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 387                 xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) +
 388                 MAX((__uint16_t)XFS_FSB_TO_B(mp, 1),
 389                     XFS_INODE_CLUSTER_SIZE(mp)) +
 390                 xfs_calc_buf_res(1, 0) +
 391                 xfs_calc_buf_res(2 + XFS_IALLOC_BLOCKS(mp) +
 392                                  mp->m_in_maxlevels, 0) +
 393                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 394                                  XFS_FSB_TO_B(mp, 1));
 395 }
 396
 397 /*
 398  * When only changing the inode we log the inode and possibly the superblock
 399  * We also add a bit of slop for the transaction stuff.
 400  */
 401 STATIC uint
 402 xfs_calc_ichange_reservation(
 403         struct xfs_mount        *mp)
 404 {
 405         return XFS_DQUOT_LOGRES(mp) +
 406                 xfs_calc_inode_res(mp, 1) +
 407                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 408
 409 }
 410
 411 /*
 412  * Growing the data section of the filesystem.
 413  *      superblock
 414  *      agi and agf
 415  *      allocation btrees
 416  */
 417 STATIC uint
 418 xfs_calc_growdata_reservation(
 419         struct xfs_mount        *mp)
 420 {
 421         return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 422                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 423                                  XFS_FSB_TO_B(mp, 1));
 424 }
 425
 426 /*
 427  * Growing the rt section of the filesystem.
 428  * In the first set of transactions (ALLOC) we allocate space to the
 429  * bitmap or summary files.
 430  *      superblock: sector size
 431  *      agf of the ag from which the extent is allocated: sector size
 432  *      bmap btree for bitmap/summary inode: max depth * blocksize
 433  *      bitmap/summary inode: inode size
 434  *      allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize
 435  */
 436 STATIC uint
 437 xfs_calc_growrtalloc_reservation(
 438         struct xfs_mount        *mp)
 439 {
 440         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 441                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
 442                                  XFS_FSB_TO_B(mp, 1)) +
 443                 xfs_calc_inode_res(mp, 1) +
 444                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 445                                  XFS_FSB_TO_B(mp, 1));
 446 }
 447
 448 /*
 449  * Growing the rt section of the filesystem.
 450  * In the second set of transactions (ZERO) we zero the new metadata blocks.
 451  *      one bitmap/summary block: blocksize
 452  */
 453 STATIC uint
 454 xfs_calc_growrtzero_reservation(
 455         struct xfs_mount        *mp)
 456 {
 457         return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize);
 458 }
 459
 460 /*
 461  * Growing the rt section of the filesystem.
 462  * In the third set of transactions (FREE) we update metadata without
 463  * allocating any new blocks.
 464  *      superblock: sector size
 465  *      bitmap inode: inode size
 466  *      summary inode: inode size
 467  *      one bitmap block: blocksize
 468  *      summary blocks: new summary size
 469  */
 470 STATIC uint
 471 xfs_calc_growrtfree_reservation(
 472         struct xfs_mount        *mp)
 473 {
 474         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 475                 xfs_calc_inode_res(mp, 2) +
 476                 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) +
 477                 xfs_calc_buf_res(1, mp->m_rsumsize);
 478 }
 479
 480 /*
 481  * Logging the inode modification timestamp on a synchronous write.
 482  *      inode
 483  */
 484 STATIC uint
 485 xfs_calc_swrite_reservation(
 486         struct xfs_mount        *mp)
 487 {
 488         return xfs_calc_inode_res(mp, 1);
 489 }
 490
 491 /*
 492  * Logging the inode mode bits when writing a setuid/setgid file
 493  *      inode
 494  */
 495 STATIC uint
 496 xfs_calc_writeid_reservation(
 497         struct xfs_mount        *mp)
 498 {
 499         return xfs_calc_inode_res(mp, 1);
 500 }
 501
 502 /*
 503  * Converting the inode from non-attributed to attributed.
 504  *      the inode being converted: inode size
 505  *      agf block and superblock (for block allocation)
 506  *      the new block (directory sized)
 507  *      bmap blocks for the new directory block
 508  *      allocation btrees
 509  */
 510 STATIC uint
 511 xfs_calc_addafork_reservation(
 512         struct xfs_mount        *mp)
 513 {
 514         return XFS_DQUOT_LOGRES(mp) +
 515                 xfs_calc_inode_res(mp, 1) +
 516                 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 517                 xfs_calc_buf_res(1, mp->m_dirblksize) +
 518                 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1,
 519                                  XFS_FSB_TO_B(mp, 1)) +
 520                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 521                                  XFS_FSB_TO_B(mp, 1));
 522 }
 523
 524 /*
 525  * Removing the attribute fork of a file
 526  *    the inode being truncated: inode size
 527  *    the inode's bmap btree: max depth * block size
 528  * And the bmap_finish transaction can free the blocks and bmap blocks:
 529  *    the agf for each of the ags: 4 * sector size
 530  *    the agfl for each of the ags: 4 * sector size
 531  *    the super block to reflect the freed blocks: sector size
 532  *    worst case split in allocation btrees per extent assuming 4 extents:
 533  *              4 exts * 2 trees * (2 * max depth - 1) * block size
 534  */
 535 STATIC uint
 536 xfs_calc_attrinval_reservation(
 537         struct xfs_mount        *mp)
 538 {
 539         return MAX((xfs_calc_inode_res(mp, 1) +
 540                     xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 541                                      XFS_FSB_TO_B(mp, 1))),
 542                    (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
 543                     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4),
 544                                      XFS_FSB_TO_B(mp, 1))));
 545 }
 546
 547 /*
 548  * Setting an attribute at mount time.
 549  *      the inode getting the attribute
 550  *      the superblock for allocations
 551  *      the agfs extents are allocated from
 552  *      the attribute btree * max depth
 553  *      the inode allocation btree
 554  * Since attribute transaction space is dependent on the size of the attribute,
 555  * the calculation is done partially at mount time and partially at runtime(see
 556  * below).
 557  */
 558 STATIC uint
 559 xfs_calc_attrsetm_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(1, mp->m_sb.sb_sectsize) +
 565                 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1));
 566 }
 567
 568 /*
 569  * Setting an attribute at runtime, transaction space unit per block.
 570  *      the superblock for allocations: sector size
 571  *      the inode bmap btree could join or split: max depth * block size
 572  * Since the runtime attribute transaction space is dependent on the total
 573  * blocks needed for the 1st bmap, here we calculate out the space unit for
 574  * one block so that the caller could figure out the total space according
 575  * to the attibute extent length in blocks by:
 576  *      ext * M_RES(mp)->tr_attrsetrt.tr_logres
 577  */
 578 STATIC uint
 579 xfs_calc_attrsetrt_reservation(
 580         struct xfs_mount        *mp)
 581 {
 582         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 583                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 584                                  XFS_FSB_TO_B(mp, 1));
 585 }
 586
 587 /*
 588  * Removing an attribute.
 589  *    the inode: inode size
 590  *    the attribute btree could join: max depth * block size
 591  *    the inode bmap btree could join or split: max depth * block size
 592  * And the bmap_finish transaction can free the attr blocks freed giving:
 593  *    the agf for the ag in which the blocks live: 2 * sector size
 594  *    the agfl for the ag in which the blocks live: 2 * sector size
 595  *    the superblock for the free block count: sector size
 596  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 597  */
 598 STATIC uint
 599 xfs_calc_attrrm_reservation(
 600         struct xfs_mount        *mp)
 601 {
 602         return XFS_DQUOT_LOGRES(mp) +
 603                 MAX((xfs_calc_inode_res(mp, 1) +
 604                      xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH,
 605                                       XFS_FSB_TO_B(mp, 1)) +
 606                      (uint)XFS_FSB_TO_B(mp,
 607                                         XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
 608                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)),
 609                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 610                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 611                                       XFS_FSB_TO_B(mp, 1))));
 612 }
 613
 614 /*
 615  * Clearing a bad agino number in an agi hash bucket.
 616  */
 617 STATIC uint
 618 xfs_calc_clear_agi_bucket_reservation(
 619         struct xfs_mount        *mp)
 620 {
 621         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 622 }
 623
 624 /*
 625  * Clearing the quotaflags in the superblock.
 626  *      the super block for changing quota flags: sector size
 627  */
 628 STATIC uint
 629 xfs_calc_qm_sbchange_reservation(
 630         struct xfs_mount        *mp)
 631 {
 632         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 633 }
 634
 635 /*
 636  * Adjusting quota limits.
 637  *    the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot)
 638  */
 639 STATIC uint
 640 xfs_calc_qm_setqlim_reservation(
 641         struct xfs_mount        *mp)
 642 {
 643         return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot));
 644 }
 645
 646 /*
 647  * Allocating quota on disk if needed.
 648  *      the write transaction log space: M_RES(mp)->tr_write.tr_logres
 649  *      the unit of quota allocation: one system block size
 650  */
 651 STATIC uint
 652 xfs_calc_qm_dqalloc_reservation(
 653         struct xfs_mount        *mp)
 654 {
 655         ASSERT(M_RES(mp)->tr_write.tr_logres);
 656         return M_RES(mp)->tr_write.tr_logres +
 657                 xfs_calc_buf_res(1,
 658                         XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
 659 }
 660
 661 /*
 662  * Turning off quotas.
 663  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 664  *    the superblock for the quota flags: sector size
 665  */
 666 STATIC uint
 667 xfs_calc_qm_quotaoff_reservation(
 668         struct xfs_mount        *mp)
 669 {
 670         return sizeof(struct xfs_qoff_logitem) * 2 +
 671                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 672 }
 673
 674 /*
 675  * End of turning off quotas.
 676  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 677  */
 678 STATIC uint
 679 xfs_calc_qm_quotaoff_end_reservation(
 680         struct xfs_mount        *mp)
 681 {
 682         return sizeof(struct xfs_qoff_logitem) * 2;
 683 }
 684
 685 /*
 686  * Syncing the incore super block changes to disk.
 687  *     the super block to reflect the changes: sector size
 688  */
 689 STATIC uint
 690 xfs_calc_sb_reservation(
 691         struct xfs_mount        *mp)
 692 {
 693         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 694 }
 695
 696 void
 697 xfs_trans_resv_calc(
 698         struct xfs_mount        *mp,
 699         struct xfs_trans_resv   *resp)
 700 {
 701         /*
 702          * The following transactions are logged in physical format and
 703          * require a permanent reservation on space.
 704          */
 705         resp->tr_write.tr_logres = xfs_calc_write_reservation(mp);
 706         resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT;
 707         resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 708
 709         resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp);
 710         resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT;
 711         resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 712
 713         resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp);
 714         resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT;
 715         resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 716
 717         resp->tr_link.tr_logres = xfs_calc_link_reservation(mp);
 718         resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT;
 719         resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 720
 721         resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp);
 722         resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT;
 723         resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 724
 725         resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp);
 726         resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT;
 727         resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 728
 729         resp->tr_create.tr_logres = xfs_calc_create_reservation(mp);
 730         resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT;
 731         resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 732
 733         resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);
 734         resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT;
 735         resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 736
 737         resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp);
 738         resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT;
 739         resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 740
 741         resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp);
 742         resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT;
 743         resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 744
 745         resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp);
 746         resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT;
 747         resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 748
 749         resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp);
 750         resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT;
 751         resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 752
 753         resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp);
 754         resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT;
 755         resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 756
 757         resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp);
 758         resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT;
 759         resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 760
 761         resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp);
 762         resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT;
 763         resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 764
 765         /*
 766          * The following transactions are logged in logical format with
 767          * a default log count.
 768          */
 769         resp->tr_qm_sbchange.tr_logres = xfs_calc_qm_sbchange_reservation(mp);
 770         resp->tr_qm_sbchange.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 771
 772         resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(mp);
 773         resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 774
 775         resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp);
 776         resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 777
 778         resp->tr_qm_equotaoff.tr_logres =
 779                 xfs_calc_qm_quotaoff_end_reservation(mp);
 780         resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 781
 782         resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
 783         resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 784
 785         /* The following transaction are logged in logical format */
 786         resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp);
 787         resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp);
 788         resp->tr_swrite.tr_logres = xfs_calc_swrite_reservation(mp);
 789         resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp);
 790         resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp);
 791         resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp);
 792         resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp);
 793         resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp);
 794         resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp);
 795 }