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_format.h"
  22 #include "xfs_log.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_error.h"
  29 #include "xfs_da_btree.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dinode.h"
  34 #include "xfs_inode.h"
  35 #include "xfs_btree.h"
  36 #include "xfs_ialloc.h"
  37 #include "xfs_alloc.h"
  38 #include "xfs_extent_busy.h"
  39 #include "xfs_bmap.h"
  40 #include "xfs_bmap_util.h"
  41 #include "xfs_quota.h"
  42 #include "xfs_qm.h"
  43 #include "xfs_trans_space.h"
  44 #include "xfs_trace.h"
  45
  46 /*
  47  * A buffer has a format structure overhead in the log in addition
  48  * to the data, so we need to take this into account when reserving
  49  * space in a transaction for a buffer.  Round the space required up
  50  * to a multiple of 128 bytes so that we don't change the historical
  51  * reservation that has been used for this overhead.
  52  */
  53 STATIC uint
  54 xfs_buf_log_overhead(void)
  55 {
  56         return round_up(sizeof(struct xlog_op_header) +
  57                         sizeof(struct xfs_buf_log_format), 128);
  58 }
  59
  60 /*
  61  * Calculate out transaction log reservation per item in bytes.
  62  *
  63  * The nbufs argument is used to indicate the number of items that
  64  * will be changed in a transaction.  size is used to tell how many
  65  * bytes should be reserved per item.
  66  */
  67 STATIC uint
  68 xfs_calc_buf_res(
  69         uint            nbufs,
  70         uint            size)
  71 {
  72         return nbufs * (size + xfs_buf_log_overhead());
  73 }
  74
  75 /*
  76  * Logging inodes is really tricksy. They are logged in memory format,
  77  * which means that what we write into the log doesn't directly translate into
  78  * the amount of space they use on disk.
  79  *
  80  * Case in point - btree format forks in memory format use more space than the
  81  * on-disk format. In memory, the buffer contains a normal btree block header so
  82  * the btree code can treat it as though it is just another generic buffer.
  83  * However, when we write it to the inode fork, we don't write all of this
  84  * header as it isn't needed. e.g. the root is only ever in the inode, so
  85  * there's no need for sibling pointers which would waste 16 bytes of space.
  86  *
  87  * Hence when we have an inode with a maximally sized btree format fork, then
  88  * amount of information we actually log is greater than the size of the inode
  89  * on disk. Hence we need an inode reservation function that calculates all this
  90  * correctly. So, we log:
  91  *
  92  * - log op headers for object
  93  * - inode log format object
  94  * - the entire inode contents (core + 2 forks)
  95  * - two bmap btree block headers
  96  */
  97 STATIC uint
  98 xfs_calc_inode_res(
  99         struct xfs_mount        *mp,
 100         uint                    ninodes)
 101 {
 102         return ninodes * (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 + XFS_IALLOC_BLOCKS(mp) +
 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 creating a link to an inode:
 216  *    the parent directory inode: inode size
 217  *    the linked inode: inode size
 218  *    the directory btree could split: (max depth + v2) * dir block size
 219  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 220  * And the bmap_finish transaction can free some bmap blocks giving:
 221  *    the agf for the ag in which the blocks live: sector size
 222  *    the agfl for the ag in which the blocks live: sector size
 223  *    the superblock for the free block count: sector size
 224  *    the allocation btrees: 2 trees * (2 * max depth - 1) * block size
 225  */
 226 STATIC uint
 227 xfs_calc_link_reservation(
 228         struct xfs_mount        *mp)
 229 {
 230         return XFS_DQUOT_LOGRES(mp) +
 231                 MAX((xfs_calc_inode_res(mp, 2) +
 232                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 233                                       XFS_FSB_TO_B(mp, 1))),
 234                     (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 235                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 236                                       XFS_FSB_TO_B(mp, 1))));
 237 }
 238
 239 /*
 240  * For removing a directory entry we can modify:
 241  *    the parent directory inode: inode size
 242  *    the removed inode: inode size
 243  *    the directory btree could join: (max depth + v2) * dir block size
 244  *    the directory bmap btree could join or split: (max depth + v2) * blocksize
 245  * And the bmap_finish transaction can free the dir and bmap blocks giving:
 246  *    the agf for the ag in which the blocks live: 2 * sector size
 247  *    the agfl for the ag in which the blocks live: 2 * sector size
 248  *    the superblock for the free block count: sector size
 249  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 250  */
 251 STATIC uint
 252 xfs_calc_remove_reservation(
 253         struct xfs_mount        *mp)
 254 {
 255         return XFS_DQUOT_LOGRES(mp) +
 256                 MAX((xfs_calc_inode_res(mp, 2) +
 257                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
 258                                       XFS_FSB_TO_B(mp, 1))),
 259                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 260                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 261                                       XFS_FSB_TO_B(mp, 1))));
 262 }
 263
 264 /*
 265  * For create, break it in to the two cases that the transaction
 266  * covers. We start with the modify case - allocation done by modification
 267  * of the state of existing inodes - and the allocation case.
 268  */
 269
 270 /*
 271  * For create we can modify:
 272  *    the parent directory inode: inode size
 273  *    the new inode: inode size
 274  *    the inode btree entry: block size
 275  *    the superblock for the nlink flag: sector size
 276  *    the directory btree: (max depth + v2) * dir block size
 277  *    the directory inode's bmap btree: (max depth + v2) * block size
 278  */
 279 STATIC uint
 280 xfs_calc_create_resv_modify(
 281         struct xfs_mount        *mp)
 282 {
 283         return xfs_calc_inode_res(mp, 2) +
 284                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 285                 (uint)XFS_FSB_TO_B(mp, 1) +
 286                 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1));
 287 }
 288
 289 /*
 290  * For create we can allocate some inodes giving:
 291  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 292  *    the superblock for the nlink flag: sector size
 293  *    the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize
 294  *    the inode btree: max depth * blocksize
 295  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 296  */
 297 STATIC uint
 298 xfs_calc_create_resv_alloc(
 299         struct xfs_mount        *mp)
 300 {
 301         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 302                 mp->m_sb.sb_sectsize +
 303                 xfs_calc_buf_res(XFS_IALLOC_BLOCKS(mp), XFS_FSB_TO_B(mp, 1)) +
 304                 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) +
 305                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 306                                  XFS_FSB_TO_B(mp, 1));
 307 }
 308
 309 STATIC uint
 310 __xfs_calc_create_reservation(
 311         struct xfs_mount        *mp)
 312 {
 313         return XFS_DQUOT_LOGRES(mp) +
 314                 MAX(xfs_calc_create_resv_alloc(mp),
 315                     xfs_calc_create_resv_modify(mp));
 316 }
 317
 318 /*
 319  * For icreate we can allocate some inodes giving:
 320  *    the agi and agf of the ag getting the new inodes: 2 * sectorsize
 321  *    the superblock for the nlink flag: sector size
 322  *    the inode btree: max depth * blocksize
 323  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 324  */
 325 STATIC uint
 326 xfs_calc_icreate_resv_alloc(
 327         struct xfs_mount        *mp)
 328 {
 329         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 330                 mp->m_sb.sb_sectsize +
 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_icreate_reservation(xfs_mount_t *mp)
 338 {
 339         return XFS_DQUOT_LOGRES(mp) +
 340                 MAX(xfs_calc_icreate_resv_alloc(mp),
 341                     xfs_calc_create_resv_modify(mp));
 342 }
 343
 344 STATIC uint
 345 xfs_calc_create_reservation(
 346         struct xfs_mount        *mp)
 347 {
 348         if (xfs_sb_version_hascrc(&mp->m_sb))
 349                 return xfs_calc_icreate_reservation(mp);
 350         return __xfs_calc_create_reservation(mp);
 351
 352 }
 353
 354 /*
 355  * Making a new directory is the same as creating a new file.
 356  */
 357 STATIC uint
 358 xfs_calc_mkdir_reservation(
 359         struct xfs_mount        *mp)
 360 {
 361         return xfs_calc_create_reservation(mp);
 362 }
 363
 364
 365 /*
 366  * Making a new symplink is the same as creating a new file, but
 367  * with the added blocks for remote symlink data which can be up to 1kB in
 368  * length (MAXPATHLEN).
 369  */
 370 STATIC uint
 371 xfs_calc_symlink_reservation(
 372         struct xfs_mount        *mp)
 373 {
 374         return xfs_calc_create_reservation(mp) +
 375                xfs_calc_buf_res(1, MAXPATHLEN);
 376 }
 377
 378 /*
 379  * In freeing an inode we can modify:
 380  *    the inode being freed: inode size
 381  *    the super block free inode counter: sector size
 382  *    the agi hash list and counters: sector size
 383  *    the inode btree entry: block size
 384  *    the on disk inode before ours in the agi hash list: inode cluster size
 385  *    the inode btree: max depth * blocksize
 386  *    the allocation btrees: 2 trees * (max depth - 1) * block size
 387  */
 388 STATIC uint
 389 xfs_calc_ifree_reservation(
 390         struct xfs_mount        *mp)
 391 {
 392         return XFS_DQUOT_LOGRES(mp) +
 393                 xfs_calc_inode_res(mp, 1) +
 394                 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 395                 xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) +
 396                 MAX((__uint16_t)XFS_FSB_TO_B(mp, 1),
 397                     XFS_INODE_CLUSTER_SIZE(mp)) +
 398                 xfs_calc_buf_res(1, 0) +
 399                 xfs_calc_buf_res(2 + XFS_IALLOC_BLOCKS(mp) +
 400                                  mp->m_in_maxlevels, 0) +
 401                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 402                                  XFS_FSB_TO_B(mp, 1));
 403 }
 404
 405 /*
 406  * When only changing the inode we log the inode and possibly the superblock
 407  * We also add a bit of slop for the transaction stuff.
 408  */
 409 STATIC uint
 410 xfs_calc_ichange_reservation(
 411         struct xfs_mount        *mp)
 412 {
 413         return XFS_DQUOT_LOGRES(mp) +
 414                 xfs_calc_inode_res(mp, 1) +
 415                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 416
 417 }
 418
 419 /*
 420  * Growing the data section of the filesystem.
 421  *      superblock
 422  *      agi and agf
 423  *      allocation btrees
 424  */
 425 STATIC uint
 426 xfs_calc_growdata_reservation(
 427         struct xfs_mount        *mp)
 428 {
 429         return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) +
 430                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 431                                  XFS_FSB_TO_B(mp, 1));
 432 }
 433
 434 /*
 435  * Growing the rt section of the filesystem.
 436  * In the first set of transactions (ALLOC) we allocate space to the
 437  * bitmap or summary files.
 438  *      superblock: sector size
 439  *      agf of the ag from which the extent is allocated: sector size
 440  *      bmap btree for bitmap/summary inode: max depth * blocksize
 441  *      bitmap/summary inode: inode size
 442  *      allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize
 443  */
 444 STATIC uint
 445 xfs_calc_growrtalloc_reservation(
 446         struct xfs_mount        *mp)
 447 {
 448         return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 449                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK),
 450                                  XFS_FSB_TO_B(mp, 1)) +
 451                 xfs_calc_inode_res(mp, 1) +
 452                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 453                                  XFS_FSB_TO_B(mp, 1));
 454 }
 455
 456 /*
 457  * Growing the rt section of the filesystem.
 458  * In the second set of transactions (ZERO) we zero the new metadata blocks.
 459  *      one bitmap/summary block: blocksize
 460  */
 461 STATIC uint
 462 xfs_calc_growrtzero_reservation(
 463         struct xfs_mount        *mp)
 464 {
 465         return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize);
 466 }
 467
 468 /*
 469  * Growing the rt section of the filesystem.
 470  * In the third set of transactions (FREE) we update metadata without
 471  * allocating any new blocks.
 472  *      superblock: sector size
 473  *      bitmap inode: inode size
 474  *      summary inode: inode size
 475  *      one bitmap block: blocksize
 476  *      summary blocks: new summary size
 477  */
 478 STATIC uint
 479 xfs_calc_growrtfree_reservation(
 480         struct xfs_mount        *mp)
 481 {
 482         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 483                 xfs_calc_inode_res(mp, 2) +
 484                 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) +
 485                 xfs_calc_buf_res(1, mp->m_rsumsize);
 486 }
 487
 488 /*
 489  * Logging the inode modification timestamp on a synchronous write.
 490  *      inode
 491  */
 492 STATIC uint
 493 xfs_calc_swrite_reservation(
 494         struct xfs_mount        *mp)
 495 {
 496         return xfs_calc_inode_res(mp, 1);
 497 }
 498
 499 /*
 500  * Logging the inode mode bits when writing a setuid/setgid file
 501  *      inode
 502  */
 503 STATIC uint
 504 xfs_calc_writeid_reservation(
 505         struct xfs_mount        *mp)
 506 {
 507         return xfs_calc_inode_res(mp, 1);
 508 }
 509
 510 /*
 511  * Converting the inode from non-attributed to attributed.
 512  *      the inode being converted: inode size
 513  *      agf block and superblock (for block allocation)
 514  *      the new block (directory sized)
 515  *      bmap blocks for the new directory block
 516  *      allocation btrees
 517  */
 518 STATIC uint
 519 xfs_calc_addafork_reservation(
 520         struct xfs_mount        *mp)
 521 {
 522         return XFS_DQUOT_LOGRES(mp) +
 523                 xfs_calc_inode_res(mp, 1) +
 524                 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) +
 525                 xfs_calc_buf_res(1, mp->m_dirblksize) +
 526                 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1,
 527                                  XFS_FSB_TO_B(mp, 1)) +
 528                 xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 1),
 529                                  XFS_FSB_TO_B(mp, 1));
 530 }
 531
 532 /*
 533  * Removing the attribute fork of a file
 534  *    the inode being truncated: inode size
 535  *    the inode's bmap btree: max depth * block size
 536  * And the bmap_finish transaction can free the blocks and bmap blocks:
 537  *    the agf for each of the ags: 4 * sector size
 538  *    the agfl for each of the ags: 4 * sector size
 539  *    the super block to reflect the freed blocks: sector size
 540  *    worst case split in allocation btrees per extent assuming 4 extents:
 541  *              4 exts * 2 trees * (2 * max depth - 1) * block size
 542  */
 543 STATIC uint
 544 xfs_calc_attrinval_reservation(
 545         struct xfs_mount        *mp)
 546 {
 547         return MAX((xfs_calc_inode_res(mp, 1) +
 548                     xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 549                                      XFS_FSB_TO_B(mp, 1))),
 550                    (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) +
 551                     xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 4),
 552                                      XFS_FSB_TO_B(mp, 1))));
 553 }
 554
 555 /*
 556  * Setting an attribute at mount time.
 557  *      the inode getting the attribute
 558  *      the superblock for allocations
 559  *      the agfs extents are allocated from
 560  *      the attribute btree * max depth
 561  *      the inode allocation btree
 562  * Since attribute transaction space is dependent on the size of the attribute,
 563  * the calculation is done partially at mount time and partially at runtime(see
 564  * below).
 565  */
 566 STATIC uint
 567 xfs_calc_attrsetm_reservation(
 568         struct xfs_mount        *mp)
 569 {
 570         return XFS_DQUOT_LOGRES(mp) +
 571                 xfs_calc_inode_res(mp, 1) +
 572                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 573                 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1));
 574 }
 575
 576 /*
 577  * Setting an attribute at runtime, transaction space unit per block.
 578  *      the superblock for allocations: sector size
 579  *      the inode bmap btree could join or split: max depth * block size
 580  * Since the runtime attribute transaction space is dependent on the total
 581  * blocks needed for the 1st bmap, here we calculate out the space unit for
 582  * one block so that the caller could figure out the total space according
 583  * to the attibute extent length in blocks by:
 584  *      ext * M_RES(mp)->tr_attrsetrt.tr_logres
 585  */
 586 STATIC uint
 587 xfs_calc_attrsetrt_reservation(
 588         struct xfs_mount        *mp)
 589 {
 590         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
 591                 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK),
 592                                  XFS_FSB_TO_B(mp, 1));
 593 }
 594
 595 /*
 596  * Removing an attribute.
 597  *    the inode: inode size
 598  *    the attribute btree could join: max depth * block size
 599  *    the inode bmap btree could join or split: max depth * block size
 600  * And the bmap_finish transaction can free the attr blocks freed giving:
 601  *    the agf for the ag in which the blocks live: 2 * sector size
 602  *    the agfl for the ag in which the blocks live: 2 * sector size
 603  *    the superblock for the free block count: sector size
 604  *    the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size
 605  */
 606 STATIC uint
 607 xfs_calc_attrrm_reservation(
 608         struct xfs_mount        *mp)
 609 {
 610         return XFS_DQUOT_LOGRES(mp) +
 611                 MAX((xfs_calc_inode_res(mp, 1) +
 612                      xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH,
 613                                       XFS_FSB_TO_B(mp, 1)) +
 614                      (uint)XFS_FSB_TO_B(mp,
 615                                         XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) +
 616                      xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)),
 617                     (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
 618                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
 619                                       XFS_FSB_TO_B(mp, 1))));
 620 }
 621
 622 /*
 623  * Clearing a bad agino number in an agi hash bucket.
 624  */
 625 STATIC uint
 626 xfs_calc_clear_agi_bucket_reservation(
 627         struct xfs_mount        *mp)
 628 {
 629         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 630 }
 631
 632 /*
 633  * Clearing the quotaflags in the superblock.
 634  *      the super block for changing quota flags: sector size
 635  */
 636 STATIC uint
 637 xfs_calc_qm_sbchange_reservation(
 638         struct xfs_mount        *mp)
 639 {
 640         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 641 }
 642
 643 /*
 644  * Adjusting quota limits.
 645  *    the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot)
 646  */
 647 STATIC uint
 648 xfs_calc_qm_setqlim_reservation(
 649         struct xfs_mount        *mp)
 650 {
 651         return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot));
 652 }
 653
 654 /*
 655  * Allocating quota on disk if needed.
 656  *      the write transaction log space: M_RES(mp)->tr_write.tr_logres
 657  *      the unit of quota allocation: one system block size
 658  */
 659 STATIC uint
 660 xfs_calc_qm_dqalloc_reservation(
 661         struct xfs_mount        *mp)
 662 {
 663         ASSERT(M_RES(mp)->tr_write.tr_logres);
 664         return M_RES(mp)->tr_write.tr_logres +
 665                 xfs_calc_buf_res(1,
 666                         XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
 667 }
 668
 669 /*
 670  * Turning off quotas.
 671  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 672  *    the superblock for the quota flags: sector size
 673  */
 674 STATIC uint
 675 xfs_calc_qm_quotaoff_reservation(
 676         struct xfs_mount        *mp)
 677 {
 678         return sizeof(struct xfs_qoff_logitem) * 2 +
 679                 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 680 }
 681
 682 /*
 683  * End of turning off quotas.
 684  *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
 685  */
 686 STATIC uint
 687 xfs_calc_qm_quotaoff_end_reservation(
 688         struct xfs_mount        *mp)
 689 {
 690         return sizeof(struct xfs_qoff_logitem) * 2;
 691 }
 692
 693 /*
 694  * Syncing the incore super block changes to disk.
 695  *     the super block to reflect the changes: sector size
 696  */
 697 STATIC uint
 698 xfs_calc_sb_reservation(
 699         struct xfs_mount        *mp)
 700 {
 701         return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
 702 }
 703
 704 void
 705 xfs_trans_resv_calc(
 706         struct xfs_mount        *mp,
 707         struct xfs_trans_resv   *resp)
 708 {
 709         /*
 710          * The following transactions are logged in physical format and
 711          * require a permanent reservation on space.
 712          */
 713         resp->tr_write.tr_logres = xfs_calc_write_reservation(mp);
 714         resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT;
 715         resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 716
 717         resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp);
 718         resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT;
 719         resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 720
 721         resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp);
 722         resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT;
 723         resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 724
 725         resp->tr_link.tr_logres = xfs_calc_link_reservation(mp);
 726         resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT;
 727         resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 728
 729         resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp);
 730         resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT;
 731         resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 732
 733         resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp);
 734         resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT;
 735         resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 736
 737         resp->tr_create.tr_logres = xfs_calc_create_reservation(mp);
 738         resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT;
 739         resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 740
 741         resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);
 742         resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT;
 743         resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 744
 745         resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp);
 746         resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT;
 747         resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 748
 749         resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp);
 750         resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT;
 751         resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 752
 753         resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp);
 754         resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT;
 755         resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 756
 757         resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp);
 758         resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT;
 759         resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 760
 761         resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp);
 762         resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT;
 763         resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 764
 765         resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp);
 766         resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT;
 767         resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 768
 769         resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp);
 770         resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT;
 771         resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 772
 773         /*
 774          * The following transactions are logged in logical format with
 775          * a default log count.
 776          */
 777         resp->tr_qm_sbchange.tr_logres = xfs_calc_qm_sbchange_reservation(mp);
 778         resp->tr_qm_sbchange.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 779
 780         resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(mp);
 781         resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 782
 783         resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp);
 784         resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 785
 786         resp->tr_qm_equotaoff.tr_logres =
 787                 xfs_calc_qm_quotaoff_end_reservation(mp);
 788         resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 789
 790         resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
 791         resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 792
 793         /* The following transaction are logged in logical format */
 794         resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp);
 795         resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp);
 796         resp->tr_swrite.tr_logres = xfs_calc_swrite_reservation(mp);
 797         resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp);
 798         resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp);
 799         resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp);
 800         resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp);
 801         resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp);
 802         resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp);
 803 }