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_mount.h" 26 #include "xfs_da_format.h" 27 #include "xfs_da_btree.h" 28 #include "xfs_inode.h" 29 #include "xfs_bmap_btree.h" 30 #include "xfs_ialloc.h" 31 #include "xfs_quota.h" 32 #include "xfs_trans.h" 33 #include "xfs_qm.h" 34 #include "xfs_trans_space.h" 35 #include "xfs_trace.h" 36 37 /* 38 * A buffer has a format structure overhead in the log in addition 39 * to the data, so we need to take this into account when reserving 40 * space in a transaction for a buffer. Round the space required up 41 * to a multiple of 128 bytes so that we don't change the historical 42 * reservation that has been used for this overhead. 43 */ 44 STATIC uint 45 xfs_buf_log_overhead(void) 46 { 47 return round_up(sizeof(struct xlog_op_header) + 48 sizeof(struct xfs_buf_log_format), 128); 49 } 50 51 /* 52 * Calculate out transaction log reservation per item in bytes. 53 * 54 * The nbufs argument is used to indicate the number of items that 55 * will be changed in a transaction. size is used to tell how many 56 * bytes should be reserved per item. 57 */ 58 STATIC uint 59 xfs_calc_buf_res( 60 uint nbufs, 61 uint size) 62 { 63 return nbufs * (size + xfs_buf_log_overhead()); 64 } 65 66 /* 67 * Per-extent log reservation for the btree changes involved in freeing or 68 * allocating an extent. In classic XFS there were two trees that will be 69 * modified (bnobt + cntbt). With rmap enabled, there are three trees 70 * (rmapbt). With reflink, there are four trees (refcountbt). The number of 71 * blocks reserved is based on the formula: 72 * 73 * num trees * ((2 blocks/level * max depth) - 1) 74 * 75 * Keep in mind that max depth is calculated separately for each type of tree. 76 */ 77 uint 78 xfs_allocfree_log_count( 79 struct xfs_mount *mp, 80 uint num_ops) 81 { 82 uint blocks; 83 84 blocks = num_ops * 2 * (2 * mp->m_ag_maxlevels - 1); 85 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) 86 blocks += num_ops * (2 * mp->m_rmap_maxlevels - 1); 87 if (xfs_sb_version_hasreflink(&mp->m_sb)) 88 blocks += num_ops * (2 * mp->m_refc_maxlevels - 1); 89 90 return blocks; 91 } 92 93 /* 94 * Logging inodes is really tricksy. They are logged in memory format, 95 * which means that what we write into the log doesn't directly translate into 96 * the amount of space they use on disk. 97 * 98 * Case in point - btree format forks in memory format use more space than the 99 * on-disk format. In memory, the buffer contains a normal btree block header so 100 * the btree code can treat it as though it is just another generic buffer. 101 * However, when we write it to the inode fork, we don't write all of this 102 * header as it isn't needed. e.g. the root is only ever in the inode, so 103 * there's no need for sibling pointers which would waste 16 bytes of space. 104 * 105 * Hence when we have an inode with a maximally sized btree format fork, then 106 * amount of information we actually log is greater than the size of the inode 107 * on disk. Hence we need an inode reservation function that calculates all this 108 * correctly. So, we log: 109 * 110 * - 4 log op headers for object 111 * - for the ilf, the inode core and 2 forks 112 * - inode log format object 113 * - the inode core 114 * - two inode forks containing bmap btree root blocks. 115 * - the btree data contained by both forks will fit into the inode size, 116 * hence when combined with the inode core above, we have a total of the 117 * actual inode size. 118 * - the BMBT headers need to be accounted separately, as they are 119 * additional to the records and pointers that fit inside the inode 120 * forks. 121 */ 122 STATIC uint 123 xfs_calc_inode_res( 124 struct xfs_mount *mp, 125 uint ninodes) 126 { 127 return ninodes * 128 (4 * sizeof(struct xlog_op_header) + 129 sizeof(struct xfs_inode_log_format) + 130 mp->m_sb.sb_inodesize + 131 2 * XFS_BMBT_BLOCK_LEN(mp)); 132 } 133 134 /* 135 * The free inode btree is a conditional feature and the log reservation 136 * requirements differ slightly from that of the traditional inode allocation 137 * btree. The finobt tracks records for inode chunks with at least one free 138 * inode. A record can be removed from the tree for an inode allocation 139 * or free and thus the finobt reservation is unconditional across: 140 * 141 * - inode allocation 142 * - inode free 143 * - inode chunk allocation 144 * 145 * The 'modify' param indicates to include the record modification scenario. The 146 * 'alloc' param indicates to include the reservation for free space btree 147 * modifications on behalf of finobt modifications. This is required only for 148 * transactions that do not already account for free space btree modifications. 149 * 150 * the free inode btree: max depth * block size 151 * the allocation btrees: 2 trees * (max depth - 1) * block size 152 * the free inode btree entry: block size 153 */ 154 STATIC uint 155 xfs_calc_finobt_res( 156 struct xfs_mount *mp, 157 int alloc, 158 int modify) 159 { 160 uint res; 161 162 if (!xfs_sb_version_hasfinobt(&mp->m_sb)) 163 return 0; 164 165 res = xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)); 166 if (alloc) 167 res += xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 168 XFS_FSB_TO_B(mp, 1)); 169 if (modify) 170 res += (uint)XFS_FSB_TO_B(mp, 1); 171 172 return res; 173 } 174 175 /* 176 * Various log reservation values. 177 * 178 * These are based on the size of the file system block because that is what 179 * most transactions manipulate. Each adds in an additional 128 bytes per 180 * item logged to try to account for the overhead of the transaction mechanism. 181 * 182 * Note: Most of the reservations underestimate the number of allocation 183 * groups into which they could free extents in the xfs_defer_finish() call. 184 * This is because the number in the worst case is quite high and quite 185 * unusual. In order to fix this we need to change xfs_defer_finish() to free 186 * extents in only a single AG at a time. This will require changes to the 187 * EFI code as well, however, so that the EFI for the extents not freed is 188 * logged again in each transaction. See SGI PV #261917. 189 * 190 * Reservation functions here avoid a huge stack in xfs_trans_init due to 191 * register overflow from temporaries in the calculations. 192 */ 193 194 195 /* 196 * In a write transaction we can allocate a maximum of 2 197 * extents. This gives: 198 * the inode getting the new extents: inode size 199 * the inode's bmap btree: max depth * block size 200 * the agfs of the ags from which the extents are allocated: 2 * sector 201 * the superblock free block counter: sector size 202 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 203 * And the bmap_finish transaction can free bmap blocks in a join: 204 * the agfs of the ags containing the blocks: 2 * sector size 205 * the agfls of the ags containing the blocks: 2 * sector size 206 * the super block free block counter: sector size 207 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 208 */ 209 STATIC uint 210 xfs_calc_write_reservation( 211 struct xfs_mount *mp) 212 { 213 return XFS_DQUOT_LOGRES(mp) + 214 MAX((xfs_calc_inode_res(mp, 1) + 215 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 216 XFS_FSB_TO_B(mp, 1)) + 217 xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 218 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 219 XFS_FSB_TO_B(mp, 1))), 220 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 221 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 222 XFS_FSB_TO_B(mp, 1)))); 223 } 224 225 /* 226 * In truncating a file we free up to two extents at once. We can modify: 227 * the inode being truncated: inode size 228 * the inode's bmap btree: (max depth + 1) * block size 229 * And the bmap_finish transaction can free the blocks and bmap blocks: 230 * the agf for each of the ags: 4 * sector size 231 * the agfl for each of the ags: 4 * sector size 232 * the super block to reflect the freed blocks: sector size 233 * worst case split in allocation btrees per extent assuming 4 extents: 234 * 4 exts * 2 trees * (2 * max depth - 1) * block size 235 * the inode btree: max depth * blocksize 236 * the allocation btrees: 2 trees * (max depth - 1) * block size 237 */ 238 STATIC uint 239 xfs_calc_itruncate_reservation( 240 struct xfs_mount *mp) 241 { 242 return XFS_DQUOT_LOGRES(mp) + 243 MAX((xfs_calc_inode_res(mp, 1) + 244 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1, 245 XFS_FSB_TO_B(mp, 1))), 246 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 247 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 4), 248 XFS_FSB_TO_B(mp, 1)) + 249 xfs_calc_buf_res(5, 0) + 250 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 251 XFS_FSB_TO_B(mp, 1)) + 252 xfs_calc_buf_res(2 + mp->m_ialloc_blks + 253 mp->m_in_maxlevels, 0))); 254 } 255 256 /* 257 * In renaming a files we can modify: 258 * the four inodes involved: 4 * inode size 259 * the two directory btrees: 2 * (max depth + v2) * dir block size 260 * the two directory bmap btrees: 2 * max depth * block size 261 * And the bmap_finish transaction can free dir and bmap blocks (two sets 262 * of bmap blocks) giving: 263 * the agf for the ags in which the blocks live: 3 * sector size 264 * the agfl for the ags in which the blocks live: 3 * sector size 265 * the superblock for the free block count: sector size 266 * the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size 267 */ 268 STATIC uint 269 xfs_calc_rename_reservation( 270 struct xfs_mount *mp) 271 { 272 return XFS_DQUOT_LOGRES(mp) + 273 MAX((xfs_calc_inode_res(mp, 4) + 274 xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp), 275 XFS_FSB_TO_B(mp, 1))), 276 (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) + 277 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 3), 278 XFS_FSB_TO_B(mp, 1)))); 279 } 280 281 /* 282 * For removing an inode from unlinked list at first, we can modify: 283 * the agi hash list and counters: sector size 284 * the on disk inode before ours in the agi hash list: inode cluster size 285 */ 286 STATIC uint 287 xfs_calc_iunlink_remove_reservation( 288 struct xfs_mount *mp) 289 { 290 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 291 max_t(uint, XFS_FSB_TO_B(mp, 1), mp->m_inode_cluster_size); 292 } 293 294 /* 295 * For creating a link to an inode: 296 * the parent directory inode: inode size 297 * the linked inode: inode size 298 * the directory btree could split: (max depth + v2) * dir block size 299 * the directory bmap btree could join or split: (max depth + v2) * blocksize 300 * And the bmap_finish transaction can free some bmap blocks giving: 301 * the agf for the ag in which the blocks live: sector size 302 * the agfl for the ag in which the blocks live: sector size 303 * the superblock for the free block count: sector size 304 * the allocation btrees: 2 trees * (2 * max depth - 1) * block size 305 */ 306 STATIC uint 307 xfs_calc_link_reservation( 308 struct xfs_mount *mp) 309 { 310 return XFS_DQUOT_LOGRES(mp) + 311 xfs_calc_iunlink_remove_reservation(mp) + 312 MAX((xfs_calc_inode_res(mp, 2) + 313 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 314 XFS_FSB_TO_B(mp, 1))), 315 (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 316 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 317 XFS_FSB_TO_B(mp, 1)))); 318 } 319 320 /* 321 * For adding an inode to unlinked list we can modify: 322 * the agi hash list: sector size 323 * the unlinked inode: inode size 324 */ 325 STATIC uint 326 xfs_calc_iunlink_add_reservation(xfs_mount_t *mp) 327 { 328 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 329 xfs_calc_inode_res(mp, 1); 330 } 331 332 /* 333 * For removing a directory entry we can modify: 334 * the parent directory inode: inode size 335 * the removed inode: inode size 336 * the directory btree could join: (max depth + v2) * dir block size 337 * the directory bmap btree could join or split: (max depth + v2) * blocksize 338 * And the bmap_finish transaction can free the dir and bmap blocks giving: 339 * the agf for the ag in which the blocks live: 2 * sector size 340 * the agfl for the ag in which the blocks live: 2 * sector size 341 * the superblock for the free block count: sector size 342 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 343 */ 344 STATIC uint 345 xfs_calc_remove_reservation( 346 struct xfs_mount *mp) 347 { 348 return XFS_DQUOT_LOGRES(mp) + 349 xfs_calc_iunlink_add_reservation(mp) + 350 MAX((xfs_calc_inode_res(mp, 1) + 351 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 352 XFS_FSB_TO_B(mp, 1))), 353 (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) + 354 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 355 XFS_FSB_TO_B(mp, 1)))); 356 } 357 358 /* 359 * For create, break it in to the two cases that the transaction 360 * covers. We start with the modify case - allocation done by modification 361 * of the state of existing inodes - and the allocation case. 362 */ 363 364 /* 365 * For create we can modify: 366 * the parent directory inode: inode size 367 * the new inode: inode size 368 * the inode btree entry: block size 369 * the superblock for the nlink flag: sector size 370 * the directory btree: (max depth + v2) * dir block size 371 * the directory inode's bmap btree: (max depth + v2) * block size 372 * the finobt (record modification and allocation btrees) 373 */ 374 STATIC uint 375 xfs_calc_create_resv_modify( 376 struct xfs_mount *mp) 377 { 378 return xfs_calc_inode_res(mp, 2) + 379 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 380 (uint)XFS_FSB_TO_B(mp, 1) + 381 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)) + 382 xfs_calc_finobt_res(mp, 1, 1); 383 } 384 385 /* 386 * For create we can allocate some inodes giving: 387 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 388 * the superblock for the nlink flag: sector size 389 * the inode blocks allocated: mp->m_ialloc_blks * blocksize 390 * the inode btree: max depth * blocksize 391 * the allocation btrees: 2 trees * (max depth - 1) * block size 392 */ 393 STATIC uint 394 xfs_calc_create_resv_alloc( 395 struct xfs_mount *mp) 396 { 397 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 398 mp->m_sb.sb_sectsize + 399 xfs_calc_buf_res(mp->m_ialloc_blks, XFS_FSB_TO_B(mp, 1)) + 400 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) + 401 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 402 XFS_FSB_TO_B(mp, 1)); 403 } 404 405 STATIC uint 406 __xfs_calc_create_reservation( 407 struct xfs_mount *mp) 408 { 409 return XFS_DQUOT_LOGRES(mp) + 410 MAX(xfs_calc_create_resv_alloc(mp), 411 xfs_calc_create_resv_modify(mp)); 412 } 413 414 /* 415 * For icreate we can allocate some inodes giving: 416 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 417 * the superblock for the nlink flag: sector size 418 * the inode btree: max depth * blocksize 419 * the allocation btrees: 2 trees * (max depth - 1) * block size 420 * the finobt (record insertion) 421 */ 422 STATIC uint 423 xfs_calc_icreate_resv_alloc( 424 struct xfs_mount *mp) 425 { 426 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 427 mp->m_sb.sb_sectsize + 428 xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) + 429 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 430 XFS_FSB_TO_B(mp, 1)) + 431 xfs_calc_finobt_res(mp, 0, 0); 432 } 433 434 STATIC uint 435 xfs_calc_icreate_reservation(xfs_mount_t *mp) 436 { 437 return XFS_DQUOT_LOGRES(mp) + 438 MAX(xfs_calc_icreate_resv_alloc(mp), 439 xfs_calc_create_resv_modify(mp)); 440 } 441 442 STATIC uint 443 xfs_calc_create_reservation( 444 struct xfs_mount *mp) 445 { 446 if (xfs_sb_version_hascrc(&mp->m_sb)) 447 return xfs_calc_icreate_reservation(mp); 448 return __xfs_calc_create_reservation(mp); 449 450 } 451 452 STATIC uint 453 xfs_calc_create_tmpfile_reservation( 454 struct xfs_mount *mp) 455 { 456 uint res = XFS_DQUOT_LOGRES(mp); 457 458 if (xfs_sb_version_hascrc(&mp->m_sb)) 459 res += xfs_calc_icreate_resv_alloc(mp); 460 else 461 res += xfs_calc_create_resv_alloc(mp); 462 463 return res + xfs_calc_iunlink_add_reservation(mp); 464 } 465 466 /* 467 * Making a new directory is the same as creating a new file. 468 */ 469 STATIC uint 470 xfs_calc_mkdir_reservation( 471 struct xfs_mount *mp) 472 { 473 return xfs_calc_create_reservation(mp); 474 } 475 476 477 /* 478 * Making a new symplink is the same as creating a new file, but 479 * with the added blocks for remote symlink data which can be up to 1kB in 480 * length (XFS_SYMLINK_MAXLEN). 481 */ 482 STATIC uint 483 xfs_calc_symlink_reservation( 484 struct xfs_mount *mp) 485 { 486 return xfs_calc_create_reservation(mp) + 487 xfs_calc_buf_res(1, XFS_SYMLINK_MAXLEN); 488 } 489 490 /* 491 * In freeing an inode we can modify: 492 * the inode being freed: inode size 493 * the super block free inode counter: sector size 494 * the agi hash list and counters: sector size 495 * the inode btree entry: block size 496 * the on disk inode before ours in the agi hash list: inode cluster size 497 * the inode btree: max depth * blocksize 498 * the allocation btrees: 2 trees * (max depth - 1) * block size 499 * the finobt (record insertion, removal or modification) 500 */ 501 STATIC uint 502 xfs_calc_ifree_reservation( 503 struct xfs_mount *mp) 504 { 505 return XFS_DQUOT_LOGRES(mp) + 506 xfs_calc_inode_res(mp, 1) + 507 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 508 xfs_calc_buf_res(1, XFS_FSB_TO_B(mp, 1)) + 509 xfs_calc_iunlink_remove_reservation(mp) + 510 xfs_calc_buf_res(1, 0) + 511 xfs_calc_buf_res(2 + mp->m_ialloc_blks + 512 mp->m_in_maxlevels, 0) + 513 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 514 XFS_FSB_TO_B(mp, 1)) + 515 xfs_calc_finobt_res(mp, 0, 1); 516 } 517 518 /* 519 * When only changing the inode we log the inode and possibly the superblock 520 * We also add a bit of slop for the transaction stuff. 521 */ 522 STATIC uint 523 xfs_calc_ichange_reservation( 524 struct xfs_mount *mp) 525 { 526 return XFS_DQUOT_LOGRES(mp) + 527 xfs_calc_inode_res(mp, 1) + 528 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 529 530 } 531 532 /* 533 * Growing the data section of the filesystem. 534 * superblock 535 * agi and agf 536 * allocation btrees 537 */ 538 STATIC uint 539 xfs_calc_growdata_reservation( 540 struct xfs_mount *mp) 541 { 542 return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 543 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 544 XFS_FSB_TO_B(mp, 1)); 545 } 546 547 /* 548 * Growing the rt section of the filesystem. 549 * In the first set of transactions (ALLOC) we allocate space to the 550 * bitmap or summary files. 551 * superblock: sector size 552 * agf of the ag from which the extent is allocated: sector size 553 * bmap btree for bitmap/summary inode: max depth * blocksize 554 * bitmap/summary inode: inode size 555 * allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize 556 */ 557 STATIC uint 558 xfs_calc_growrtalloc_reservation( 559 struct xfs_mount *mp) 560 { 561 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 562 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 563 XFS_FSB_TO_B(mp, 1)) + 564 xfs_calc_inode_res(mp, 1) + 565 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 566 XFS_FSB_TO_B(mp, 1)); 567 } 568 569 /* 570 * Growing the rt section of the filesystem. 571 * In the second set of transactions (ZERO) we zero the new metadata blocks. 572 * one bitmap/summary block: blocksize 573 */ 574 STATIC uint 575 xfs_calc_growrtzero_reservation( 576 struct xfs_mount *mp) 577 { 578 return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize); 579 } 580 581 /* 582 * Growing the rt section of the filesystem. 583 * In the third set of transactions (FREE) we update metadata without 584 * allocating any new blocks. 585 * superblock: sector size 586 * bitmap inode: inode size 587 * summary inode: inode size 588 * one bitmap block: blocksize 589 * summary blocks: new summary size 590 */ 591 STATIC uint 592 xfs_calc_growrtfree_reservation( 593 struct xfs_mount *mp) 594 { 595 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 596 xfs_calc_inode_res(mp, 2) + 597 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) + 598 xfs_calc_buf_res(1, mp->m_rsumsize); 599 } 600 601 /* 602 * Logging the inode modification timestamp on a synchronous write. 603 * inode 604 */ 605 STATIC uint 606 xfs_calc_swrite_reservation( 607 struct xfs_mount *mp) 608 { 609 return xfs_calc_inode_res(mp, 1); 610 } 611 612 /* 613 * Logging the inode mode bits when writing a setuid/setgid file 614 * inode 615 */ 616 STATIC uint 617 xfs_calc_writeid_reservation( 618 struct xfs_mount *mp) 619 { 620 return xfs_calc_inode_res(mp, 1); 621 } 622 623 /* 624 * Converting the inode from non-attributed to attributed. 625 * the inode being converted: inode size 626 * agf block and superblock (for block allocation) 627 * the new block (directory sized) 628 * bmap blocks for the new directory block 629 * allocation btrees 630 */ 631 STATIC uint 632 xfs_calc_addafork_reservation( 633 struct xfs_mount *mp) 634 { 635 return XFS_DQUOT_LOGRES(mp) + 636 xfs_calc_inode_res(mp, 1) + 637 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 638 xfs_calc_buf_res(1, mp->m_dir_geo->blksize) + 639 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1, 640 XFS_FSB_TO_B(mp, 1)) + 641 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 642 XFS_FSB_TO_B(mp, 1)); 643 } 644 645 /* 646 * Removing the attribute fork of a file 647 * the inode being truncated: inode size 648 * the inode's bmap btree: max depth * block size 649 * And the bmap_finish transaction can free the blocks and bmap blocks: 650 * the agf for each of the ags: 4 * sector size 651 * the agfl for each of the ags: 4 * sector size 652 * the super block to reflect the freed blocks: sector size 653 * worst case split in allocation btrees per extent assuming 4 extents: 654 * 4 exts * 2 trees * (2 * max depth - 1) * block size 655 */ 656 STATIC uint 657 xfs_calc_attrinval_reservation( 658 struct xfs_mount *mp) 659 { 660 return MAX((xfs_calc_inode_res(mp, 1) + 661 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 662 XFS_FSB_TO_B(mp, 1))), 663 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 664 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 4), 665 XFS_FSB_TO_B(mp, 1)))); 666 } 667 668 /* 669 * Setting an attribute at mount time. 670 * the inode getting the attribute 671 * the superblock for allocations 672 * the agfs extents are allocated from 673 * the attribute btree * max depth 674 * the inode allocation btree 675 * Since attribute transaction space is dependent on the size of the attribute, 676 * the calculation is done partially at mount time and partially at runtime(see 677 * below). 678 */ 679 STATIC uint 680 xfs_calc_attrsetm_reservation( 681 struct xfs_mount *mp) 682 { 683 return XFS_DQUOT_LOGRES(mp) + 684 xfs_calc_inode_res(mp, 1) + 685 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 686 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1)); 687 } 688 689 /* 690 * Setting an attribute at runtime, transaction space unit per block. 691 * the superblock for allocations: sector size 692 * the inode bmap btree could join or split: max depth * block size 693 * Since the runtime attribute transaction space is dependent on the total 694 * blocks needed for the 1st bmap, here we calculate out the space unit for 695 * one block so that the caller could figure out the total space according 696 * to the attibute extent length in blocks by: 697 * ext * M_RES(mp)->tr_attrsetrt.tr_logres 698 */ 699 STATIC uint 700 xfs_calc_attrsetrt_reservation( 701 struct xfs_mount *mp) 702 { 703 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 704 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 705 XFS_FSB_TO_B(mp, 1)); 706 } 707 708 /* 709 * Removing an attribute. 710 * the inode: inode size 711 * the attribute btree could join: max depth * block size 712 * the inode bmap btree could join or split: max depth * block size 713 * And the bmap_finish transaction can free the attr blocks freed giving: 714 * the agf for the ag in which the blocks live: 2 * sector size 715 * the agfl for the ag in which the blocks live: 2 * sector size 716 * the superblock for the free block count: sector size 717 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 718 */ 719 STATIC uint 720 xfs_calc_attrrm_reservation( 721 struct xfs_mount *mp) 722 { 723 return XFS_DQUOT_LOGRES(mp) + 724 MAX((xfs_calc_inode_res(mp, 1) + 725 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, 726 XFS_FSB_TO_B(mp, 1)) + 727 (uint)XFS_FSB_TO_B(mp, 728 XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) + 729 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)), 730 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 731 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 732 XFS_FSB_TO_B(mp, 1)))); 733 } 734 735 /* 736 * Clearing a bad agino number in an agi hash bucket. 737 */ 738 STATIC uint 739 xfs_calc_clear_agi_bucket_reservation( 740 struct xfs_mount *mp) 741 { 742 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 743 } 744 745 /* 746 * Adjusting quota limits. 747 * the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot) 748 */ 749 STATIC uint 750 xfs_calc_qm_setqlim_reservation( 751 struct xfs_mount *mp) 752 { 753 return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot)); 754 } 755 756 /* 757 * Allocating quota on disk if needed. 758 * the write transaction log space for quota file extent allocation 759 * the unit of quota allocation: one system block size 760 */ 761 STATIC uint 762 xfs_calc_qm_dqalloc_reservation( 763 struct xfs_mount *mp) 764 { 765 return xfs_calc_write_reservation(mp) + 766 xfs_calc_buf_res(1, 767 XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1); 768 } 769 770 /* 771 * Turning off quotas. 772 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 773 * the superblock for the quota flags: sector size 774 */ 775 STATIC uint 776 xfs_calc_qm_quotaoff_reservation( 777 struct xfs_mount *mp) 778 { 779 return sizeof(struct xfs_qoff_logitem) * 2 + 780 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 781 } 782 783 /* 784 * End of turning off quotas. 785 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 786 */ 787 STATIC uint 788 xfs_calc_qm_quotaoff_end_reservation( 789 struct xfs_mount *mp) 790 { 791 return sizeof(struct xfs_qoff_logitem) * 2; 792 } 793 794 /* 795 * Syncing the incore super block changes to disk. 796 * the super block to reflect the changes: sector size 797 */ 798 STATIC uint 799 xfs_calc_sb_reservation( 800 struct xfs_mount *mp) 801 { 802 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 803 } 804 805 void 806 xfs_trans_resv_calc( 807 struct xfs_mount *mp, 808 struct xfs_trans_resv *resp) 809 { 810 /* 811 * The following transactions are logged in physical format and 812 * require a permanent reservation on space. 813 */ 814 resp->tr_write.tr_logres = xfs_calc_write_reservation(mp); 815 if (xfs_sb_version_hasreflink(&mp->m_sb)) 816 resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; 817 else 818 resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; 819 resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 820 821 resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp); 822 if (xfs_sb_version_hasreflink(&mp->m_sb)) 823 resp->tr_itruncate.tr_logcount = 824 XFS_ITRUNCATE_LOG_COUNT_REFLINK; 825 else 826 resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; 827 resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 828 829 resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp); 830 resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT; 831 resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 832 833 resp->tr_link.tr_logres = xfs_calc_link_reservation(mp); 834 resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT; 835 resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 836 837 resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp); 838 resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT; 839 resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 840 841 resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp); 842 resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT; 843 resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 844 845 resp->tr_create.tr_logres = xfs_calc_create_reservation(mp); 846 resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT; 847 resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 848 849 resp->tr_create_tmpfile.tr_logres = 850 xfs_calc_create_tmpfile_reservation(mp); 851 resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT; 852 resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 853 854 resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp); 855 resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT; 856 resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 857 858 resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp); 859 resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT; 860 resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 861 862 resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp); 863 resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT; 864 resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 865 866 resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp); 867 resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT; 868 resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 869 870 resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp); 871 resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT; 872 resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 873 874 resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp); 875 resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT; 876 resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 877 878 resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp); 879 resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT; 880 resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 881 882 resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp); 883 if (xfs_sb_version_hasreflink(&mp->m_sb)) 884 resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; 885 else 886 resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; 887 resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 888 889 /* 890 * The following transactions are logged in logical format with 891 * a default log count. 892 */ 893 resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(mp); 894 resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT; 895 896 resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp); 897 resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 898 899 resp->tr_qm_equotaoff.tr_logres = 900 xfs_calc_qm_quotaoff_end_reservation(mp); 901 resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 902 903 resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp); 904 resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT; 905 906 /* The following transaction are logged in logical format */ 907 resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp); 908 resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp); 909 resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp); 910 resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp); 911 resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp); 912 resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp); 913 resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp); 914 resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp); 915 } 916