1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 4 * Copyright (C) 2010 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7 #include "xfs.h" 8 #include "xfs_fs.h" 9 #include "xfs_shared.h" 10 #include "xfs_format.h" 11 #include "xfs_log_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_mount.h" 14 #include "xfs_da_format.h" 15 #include "xfs_da_btree.h" 16 #include "xfs_inode.h" 17 #include "xfs_bmap_btree.h" 18 #include "xfs_ialloc.h" 19 #include "xfs_quota.h" 20 #include "xfs_trans.h" 21 #include "xfs_qm.h" 22 #include "xfs_trans_space.h" 23 #include "xfs_trace.h" 24 25 #define _ALLOC true 26 #define _FREE false 27 28 /* 29 * A buffer has a format structure overhead in the log in addition 30 * to the data, so we need to take this into account when reserving 31 * space in a transaction for a buffer. Round the space required up 32 * to a multiple of 128 bytes so that we don't change the historical 33 * reservation that has been used for this overhead. 34 */ 35 STATIC uint 36 xfs_buf_log_overhead(void) 37 { 38 return round_up(sizeof(struct xlog_op_header) + 39 sizeof(struct xfs_buf_log_format), 128); 40 } 41 42 /* 43 * Calculate out transaction log reservation per item in bytes. 44 * 45 * The nbufs argument is used to indicate the number of items that 46 * will be changed in a transaction. size is used to tell how many 47 * bytes should be reserved per item. 48 */ 49 STATIC uint 50 xfs_calc_buf_res( 51 uint nbufs, 52 uint size) 53 { 54 return nbufs * (size + xfs_buf_log_overhead()); 55 } 56 57 /* 58 * Per-extent log reservation for the btree changes involved in freeing or 59 * allocating an extent. In classic XFS there were two trees that will be 60 * modified (bnobt + cntbt). With rmap enabled, there are three trees 61 * (rmapbt). With reflink, there are four trees (refcountbt). The number of 62 * blocks reserved is based on the formula: 63 * 64 * num trees * ((2 blocks/level * max depth) - 1) 65 * 66 * Keep in mind that max depth is calculated separately for each type of tree. 67 */ 68 uint 69 xfs_allocfree_log_count( 70 struct xfs_mount *mp, 71 uint num_ops) 72 { 73 uint blocks; 74 75 blocks = num_ops * 2 * (2 * mp->m_ag_maxlevels - 1); 76 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) 77 blocks += num_ops * (2 * mp->m_rmap_maxlevels - 1); 78 if (xfs_sb_version_hasreflink(&mp->m_sb)) 79 blocks += num_ops * (2 * mp->m_refc_maxlevels - 1); 80 81 return blocks; 82 } 83 84 /* 85 * Logging inodes is really tricksy. They are logged in memory format, 86 * which means that what we write into the log doesn't directly translate into 87 * the amount of space they use on disk. 88 * 89 * Case in point - btree format forks in memory format use more space than the 90 * on-disk format. In memory, the buffer contains a normal btree block header so 91 * the btree code can treat it as though it is just another generic buffer. 92 * However, when we write it to the inode fork, we don't write all of this 93 * header as it isn't needed. e.g. the root is only ever in the inode, so 94 * there's no need for sibling pointers which would waste 16 bytes of space. 95 * 96 * Hence when we have an inode with a maximally sized btree format fork, then 97 * amount of information we actually log is greater than the size of the inode 98 * on disk. Hence we need an inode reservation function that calculates all this 99 * correctly. So, we log: 100 * 101 * - 4 log op headers for object 102 * - for the ilf, the inode core and 2 forks 103 * - inode log format object 104 * - the inode core 105 * - two inode forks containing bmap btree root blocks. 106 * - the btree data contained by both forks will fit into the inode size, 107 * hence when combined with the inode core above, we have a total of the 108 * actual inode size. 109 * - the BMBT headers need to be accounted separately, as they are 110 * additional to the records and pointers that fit inside the inode 111 * forks. 112 */ 113 STATIC uint 114 xfs_calc_inode_res( 115 struct xfs_mount *mp, 116 uint ninodes) 117 { 118 return ninodes * 119 (4 * sizeof(struct xlog_op_header) + 120 sizeof(struct xfs_inode_log_format) + 121 mp->m_sb.sb_inodesize + 122 2 * XFS_BMBT_BLOCK_LEN(mp)); 123 } 124 125 /* 126 * Inode btree record insertion/removal modifies the inode btree and free space 127 * btrees (since the inobt does not use the agfl). This requires the following 128 * reservation: 129 * 130 * the inode btree: max depth * blocksize 131 * the allocation btrees: 2 trees * (max depth - 1) * block size 132 * 133 * The caller must account for SB and AG header modifications, etc. 134 */ 135 STATIC uint 136 xfs_calc_inobt_res( 137 struct xfs_mount *mp) 138 { 139 return xfs_calc_buf_res(mp->m_in_maxlevels, XFS_FSB_TO_B(mp, 1)) + 140 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 141 XFS_FSB_TO_B(mp, 1)); 142 } 143 144 /* 145 * The free inode btree is a conditional feature. The behavior differs slightly 146 * from that of the traditional inode btree in that the finobt tracks records 147 * for inode chunks with at least one free inode. A record can be removed from 148 * the tree during individual inode allocation. Therefore the finobt 149 * reservation is unconditional for both the inode chunk allocation and 150 * individual inode allocation (modify) cases. 151 * 152 * Behavior aside, the reservation for finobt modification is equivalent to the 153 * traditional inobt: cover a full finobt shape change plus block allocation. 154 */ 155 STATIC uint 156 xfs_calc_finobt_res( 157 struct xfs_mount *mp) 158 { 159 if (!xfs_sb_version_hasfinobt(&mp->m_sb)) 160 return 0; 161 162 return xfs_calc_inobt_res(mp); 163 } 164 165 /* 166 * Calculate the reservation required to allocate or free an inode chunk. This 167 * includes: 168 * 169 * the allocation btrees: 2 trees * (max depth - 1) * block size 170 * the inode chunk: m_ialloc_blks * N 171 * 172 * The size N of the inode chunk reservation depends on whether it is for 173 * allocation or free and which type of create transaction is in use. An inode 174 * chunk free always invalidates the buffers and only requires reservation for 175 * headers (N == 0). An inode chunk allocation requires a chunk sized 176 * reservation on v4 and older superblocks to initialize the chunk. No chunk 177 * reservation is required for allocation on v5 supers, which use ordered 178 * buffers to initialize. 179 */ 180 STATIC uint 181 xfs_calc_inode_chunk_res( 182 struct xfs_mount *mp, 183 bool alloc) 184 { 185 uint res, size = 0; 186 187 res = xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 188 XFS_FSB_TO_B(mp, 1)); 189 if (alloc) { 190 /* icreate tx uses ordered buffers */ 191 if (xfs_sb_version_hascrc(&mp->m_sb)) 192 return res; 193 size = XFS_FSB_TO_B(mp, 1); 194 } 195 196 res += xfs_calc_buf_res(mp->m_ialloc_blks, size); 197 return res; 198 } 199 200 /* 201 * Various log reservation values. 202 * 203 * These are based on the size of the file system block because that is what 204 * most transactions manipulate. Each adds in an additional 128 bytes per 205 * item logged to try to account for the overhead of the transaction mechanism. 206 * 207 * Note: Most of the reservations underestimate the number of allocation 208 * groups into which they could free extents in the xfs_defer_finish() call. 209 * This is because the number in the worst case is quite high and quite 210 * unusual. In order to fix this we need to change xfs_defer_finish() to free 211 * extents in only a single AG at a time. This will require changes to the 212 * EFI code as well, however, so that the EFI for the extents not freed is 213 * logged again in each transaction. See SGI PV #261917. 214 * 215 * Reservation functions here avoid a huge stack in xfs_trans_init due to 216 * register overflow from temporaries in the calculations. 217 */ 218 219 220 /* 221 * In a write transaction we can allocate a maximum of 2 222 * extents. This gives: 223 * the inode getting the new extents: inode size 224 * the inode's bmap btree: max depth * block size 225 * the agfs of the ags from which the extents are allocated: 2 * sector 226 * the superblock free block counter: sector size 227 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 228 * And the bmap_finish transaction can free bmap blocks in a join: 229 * the agfs of the ags containing the blocks: 2 * sector size 230 * the agfls of the ags containing the blocks: 2 * sector size 231 * the super block free block counter: sector size 232 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 233 */ 234 STATIC uint 235 xfs_calc_write_reservation( 236 struct xfs_mount *mp) 237 { 238 return XFS_DQUOT_LOGRES(mp) + 239 max((xfs_calc_inode_res(mp, 1) + 240 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 241 XFS_FSB_TO_B(mp, 1)) + 242 xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 243 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 244 XFS_FSB_TO_B(mp, 1))), 245 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 246 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 247 XFS_FSB_TO_B(mp, 1)))); 248 } 249 250 /* 251 * In truncating a file we free up to two extents at once. We can modify: 252 * the inode being truncated: inode size 253 * the inode's bmap btree: (max depth + 1) * block size 254 * And the bmap_finish transaction can free the blocks and bmap blocks: 255 * the agf for each of the ags: 4 * sector size 256 * the agfl for each of the ags: 4 * sector size 257 * the super block to reflect the freed blocks: sector size 258 * worst case split in allocation btrees per extent assuming 4 extents: 259 * 4 exts * 2 trees * (2 * max depth - 1) * block size 260 */ 261 STATIC uint 262 xfs_calc_itruncate_reservation( 263 struct xfs_mount *mp) 264 { 265 return XFS_DQUOT_LOGRES(mp) + 266 max((xfs_calc_inode_res(mp, 1) + 267 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1, 268 XFS_FSB_TO_B(mp, 1))), 269 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 270 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 4), 271 XFS_FSB_TO_B(mp, 1)))); 272 } 273 274 /* 275 * In renaming a files we can modify: 276 * the four inodes involved: 4 * inode size 277 * the two directory btrees: 2 * (max depth + v2) * dir block size 278 * the two directory bmap btrees: 2 * max depth * block size 279 * And the bmap_finish transaction can free dir and bmap blocks (two sets 280 * of bmap blocks) giving: 281 * the agf for the ags in which the blocks live: 3 * sector size 282 * the agfl for the ags in which the blocks live: 3 * sector size 283 * the superblock for the free block count: sector size 284 * the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size 285 */ 286 STATIC uint 287 xfs_calc_rename_reservation( 288 struct xfs_mount *mp) 289 { 290 return XFS_DQUOT_LOGRES(mp) + 291 max((xfs_calc_inode_res(mp, 4) + 292 xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp), 293 XFS_FSB_TO_B(mp, 1))), 294 (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) + 295 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 3), 296 XFS_FSB_TO_B(mp, 1)))); 297 } 298 299 /* 300 * For removing an inode from unlinked list at first, we can modify: 301 * the agi hash list and counters: sector size 302 * the on disk inode before ours in the agi hash list: inode cluster size 303 * the on disk inode in the agi hash list: inode cluster size 304 */ 305 STATIC uint 306 xfs_calc_iunlink_remove_reservation( 307 struct xfs_mount *mp) 308 { 309 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 310 2 * max_t(uint, XFS_FSB_TO_B(mp, 1), mp->m_inode_cluster_size); 311 } 312 313 /* 314 * For creating a link to an inode: 315 * the parent directory inode: inode size 316 * the linked inode: inode size 317 * the directory btree could split: (max depth + v2) * dir block size 318 * the directory bmap btree could join or split: (max depth + v2) * blocksize 319 * And the bmap_finish transaction can free some bmap blocks giving: 320 * the agf for the ag in which the blocks live: sector size 321 * the agfl for the ag in which the blocks live: sector size 322 * the superblock for the free block count: sector size 323 * the allocation btrees: 2 trees * (2 * max depth - 1) * block size 324 */ 325 STATIC uint 326 xfs_calc_link_reservation( 327 struct xfs_mount *mp) 328 { 329 return XFS_DQUOT_LOGRES(mp) + 330 xfs_calc_iunlink_remove_reservation(mp) + 331 max((xfs_calc_inode_res(mp, 2) + 332 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 333 XFS_FSB_TO_B(mp, 1))), 334 (xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 335 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 336 XFS_FSB_TO_B(mp, 1)))); 337 } 338 339 /* 340 * For adding an inode to unlinked list we can modify: 341 * the agi hash list: sector size 342 * the on disk inode: inode cluster size 343 */ 344 STATIC uint 345 xfs_calc_iunlink_add_reservation(xfs_mount_t *mp) 346 { 347 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 348 max_t(uint, XFS_FSB_TO_B(mp, 1), mp->m_inode_cluster_size); 349 } 350 351 /* 352 * For removing a directory entry we can modify: 353 * the parent directory inode: inode size 354 * the removed inode: inode size 355 * the directory btree could join: (max depth + v2) * dir block size 356 * the directory bmap btree could join or split: (max depth + v2) * blocksize 357 * And the bmap_finish transaction can free the dir and bmap blocks giving: 358 * the agf for the ag in which the blocks live: 2 * sector size 359 * the agfl for the ag in which the blocks live: 2 * sector size 360 * the superblock for the free block count: sector size 361 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 362 */ 363 STATIC uint 364 xfs_calc_remove_reservation( 365 struct xfs_mount *mp) 366 { 367 return XFS_DQUOT_LOGRES(mp) + 368 xfs_calc_iunlink_add_reservation(mp) + 369 max((xfs_calc_inode_res(mp, 1) + 370 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), 371 XFS_FSB_TO_B(mp, 1))), 372 (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) + 373 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 374 XFS_FSB_TO_B(mp, 1)))); 375 } 376 377 /* 378 * For create, break it in to the two cases that the transaction 379 * covers. We start with the modify case - allocation done by modification 380 * of the state of existing inodes - and the allocation case. 381 */ 382 383 /* 384 * For create we can modify: 385 * the parent directory inode: inode size 386 * the new inode: inode size 387 * the inode btree entry: block size 388 * the superblock for the nlink flag: sector size 389 * the directory btree: (max depth + v2) * dir block size 390 * the directory inode's bmap btree: (max depth + v2) * block size 391 * the finobt (record modification and allocation btrees) 392 */ 393 STATIC uint 394 xfs_calc_create_resv_modify( 395 struct xfs_mount *mp) 396 { 397 return xfs_calc_inode_res(mp, 2) + 398 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 399 (uint)XFS_FSB_TO_B(mp, 1) + 400 xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp), XFS_FSB_TO_B(mp, 1)) + 401 xfs_calc_finobt_res(mp); 402 } 403 404 /* 405 * For icreate we can allocate some inodes giving: 406 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 407 * the superblock for the nlink flag: sector size 408 * the inode chunk (allocation, optional init) 409 * the inobt (record insertion) 410 * the finobt (optional, record insertion) 411 */ 412 STATIC uint 413 xfs_calc_icreate_resv_alloc( 414 struct xfs_mount *mp) 415 { 416 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 417 mp->m_sb.sb_sectsize + 418 xfs_calc_inode_chunk_res(mp, _ALLOC) + 419 xfs_calc_inobt_res(mp) + 420 xfs_calc_finobt_res(mp); 421 } 422 423 STATIC uint 424 xfs_calc_icreate_reservation(xfs_mount_t *mp) 425 { 426 return XFS_DQUOT_LOGRES(mp) + 427 max(xfs_calc_icreate_resv_alloc(mp), 428 xfs_calc_create_resv_modify(mp)); 429 } 430 431 STATIC uint 432 xfs_calc_create_tmpfile_reservation( 433 struct xfs_mount *mp) 434 { 435 uint res = XFS_DQUOT_LOGRES(mp); 436 437 res += xfs_calc_icreate_resv_alloc(mp); 438 return res + xfs_calc_iunlink_add_reservation(mp); 439 } 440 441 /* 442 * Making a new directory is the same as creating a new file. 443 */ 444 STATIC uint 445 xfs_calc_mkdir_reservation( 446 struct xfs_mount *mp) 447 { 448 return xfs_calc_icreate_reservation(mp); 449 } 450 451 452 /* 453 * Making a new symplink is the same as creating a new file, but 454 * with the added blocks for remote symlink data which can be up to 1kB in 455 * length (XFS_SYMLINK_MAXLEN). 456 */ 457 STATIC uint 458 xfs_calc_symlink_reservation( 459 struct xfs_mount *mp) 460 { 461 return xfs_calc_icreate_reservation(mp) + 462 xfs_calc_buf_res(1, XFS_SYMLINK_MAXLEN); 463 } 464 465 /* 466 * In freeing an inode we can modify: 467 * the inode being freed: inode size 468 * the super block free inode counter, AGF and AGFL: sector size 469 * the on disk inode (agi unlinked list removal) 470 * the inode chunk (invalidated, headers only) 471 * the inode btree 472 * the finobt (record insertion, removal or modification) 473 * 474 * Note that the inode chunk res. includes an allocfree res. for freeing of the 475 * inode chunk. This is technically extraneous because the inode chunk free is 476 * deferred (it occurs after a transaction roll). Include the extra reservation 477 * anyways since we've had reports of ifree transaction overruns due to too many 478 * agfl fixups during inode chunk frees. 479 */ 480 STATIC uint 481 xfs_calc_ifree_reservation( 482 struct xfs_mount *mp) 483 { 484 return XFS_DQUOT_LOGRES(mp) + 485 xfs_calc_inode_res(mp, 1) + 486 xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 487 xfs_calc_iunlink_remove_reservation(mp) + 488 xfs_calc_inode_chunk_res(mp, _FREE) + 489 xfs_calc_inobt_res(mp) + 490 xfs_calc_finobt_res(mp); 491 } 492 493 /* 494 * When only changing the inode we log the inode and possibly the superblock 495 * We also add a bit of slop for the transaction stuff. 496 */ 497 STATIC uint 498 xfs_calc_ichange_reservation( 499 struct xfs_mount *mp) 500 { 501 return XFS_DQUOT_LOGRES(mp) + 502 xfs_calc_inode_res(mp, 1) + 503 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 504 505 } 506 507 /* 508 * Growing the data section of the filesystem. 509 * superblock 510 * agi and agf 511 * allocation btrees 512 */ 513 STATIC uint 514 xfs_calc_growdata_reservation( 515 struct xfs_mount *mp) 516 { 517 return xfs_calc_buf_res(3, mp->m_sb.sb_sectsize) + 518 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 519 XFS_FSB_TO_B(mp, 1)); 520 } 521 522 /* 523 * Growing the rt section of the filesystem. 524 * In the first set of transactions (ALLOC) we allocate space to the 525 * bitmap or summary files. 526 * superblock: sector size 527 * agf of the ag from which the extent is allocated: sector size 528 * bmap btree for bitmap/summary inode: max depth * blocksize 529 * bitmap/summary inode: inode size 530 * allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize 531 */ 532 STATIC uint 533 xfs_calc_growrtalloc_reservation( 534 struct xfs_mount *mp) 535 { 536 return xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 537 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 538 XFS_FSB_TO_B(mp, 1)) + 539 xfs_calc_inode_res(mp, 1) + 540 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 541 XFS_FSB_TO_B(mp, 1)); 542 } 543 544 /* 545 * Growing the rt section of the filesystem. 546 * In the second set of transactions (ZERO) we zero the new metadata blocks. 547 * one bitmap/summary block: blocksize 548 */ 549 STATIC uint 550 xfs_calc_growrtzero_reservation( 551 struct xfs_mount *mp) 552 { 553 return xfs_calc_buf_res(1, mp->m_sb.sb_blocksize); 554 } 555 556 /* 557 * Growing the rt section of the filesystem. 558 * In the third set of transactions (FREE) we update metadata without 559 * allocating any new blocks. 560 * superblock: sector size 561 * bitmap inode: inode size 562 * summary inode: inode size 563 * one bitmap block: blocksize 564 * summary blocks: new summary size 565 */ 566 STATIC uint 567 xfs_calc_growrtfree_reservation( 568 struct xfs_mount *mp) 569 { 570 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 571 xfs_calc_inode_res(mp, 2) + 572 xfs_calc_buf_res(1, mp->m_sb.sb_blocksize) + 573 xfs_calc_buf_res(1, mp->m_rsumsize); 574 } 575 576 /* 577 * Logging the inode modification timestamp on a synchronous write. 578 * inode 579 */ 580 STATIC uint 581 xfs_calc_swrite_reservation( 582 struct xfs_mount *mp) 583 { 584 return xfs_calc_inode_res(mp, 1); 585 } 586 587 /* 588 * Logging the inode mode bits when writing a setuid/setgid file 589 * inode 590 */ 591 STATIC uint 592 xfs_calc_writeid_reservation( 593 struct xfs_mount *mp) 594 { 595 return xfs_calc_inode_res(mp, 1); 596 } 597 598 /* 599 * Converting the inode from non-attributed to attributed. 600 * the inode being converted: inode size 601 * agf block and superblock (for block allocation) 602 * the new block (directory sized) 603 * bmap blocks for the new directory block 604 * allocation btrees 605 */ 606 STATIC uint 607 xfs_calc_addafork_reservation( 608 struct xfs_mount *mp) 609 { 610 return XFS_DQUOT_LOGRES(mp) + 611 xfs_calc_inode_res(mp, 1) + 612 xfs_calc_buf_res(2, mp->m_sb.sb_sectsize) + 613 xfs_calc_buf_res(1, mp->m_dir_geo->blksize) + 614 xfs_calc_buf_res(XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1, 615 XFS_FSB_TO_B(mp, 1)) + 616 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 1), 617 XFS_FSB_TO_B(mp, 1)); 618 } 619 620 /* 621 * Removing the attribute fork of a file 622 * the inode being truncated: inode size 623 * the inode's bmap btree: max depth * block size 624 * And the bmap_finish transaction can free the blocks and bmap blocks: 625 * the agf for each of the ags: 4 * sector size 626 * the agfl for each of the ags: 4 * sector size 627 * the super block to reflect the freed blocks: sector size 628 * worst case split in allocation btrees per extent assuming 4 extents: 629 * 4 exts * 2 trees * (2 * max depth - 1) * block size 630 */ 631 STATIC uint 632 xfs_calc_attrinval_reservation( 633 struct xfs_mount *mp) 634 { 635 return max((xfs_calc_inode_res(mp, 1) + 636 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 637 XFS_FSB_TO_B(mp, 1))), 638 (xfs_calc_buf_res(9, mp->m_sb.sb_sectsize) + 639 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 4), 640 XFS_FSB_TO_B(mp, 1)))); 641 } 642 643 /* 644 * Setting an attribute at mount time. 645 * the inode getting the attribute 646 * the superblock for allocations 647 * the agfs extents are allocated from 648 * the attribute btree * max depth 649 * the inode allocation btree 650 * Since attribute transaction space is dependent on the size of the attribute, 651 * the calculation is done partially at mount time and partially at runtime(see 652 * below). 653 */ 654 STATIC uint 655 xfs_calc_attrsetm_reservation( 656 struct xfs_mount *mp) 657 { 658 return XFS_DQUOT_LOGRES(mp) + 659 xfs_calc_inode_res(mp, 1) + 660 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 661 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, XFS_FSB_TO_B(mp, 1)); 662 } 663 664 /* 665 * Setting an attribute at runtime, transaction space unit per block. 666 * the superblock for allocations: sector size 667 * the inode bmap btree could join or split: max depth * block size 668 * Since the runtime attribute transaction space is dependent on the total 669 * blocks needed for the 1st bmap, here we calculate out the space unit for 670 * one block so that the caller could figure out the total space according 671 * to the attibute extent length in blocks by: 672 * ext * M_RES(mp)->tr_attrsetrt.tr_logres 673 */ 674 STATIC uint 675 xfs_calc_attrsetrt_reservation( 676 struct xfs_mount *mp) 677 { 678 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) + 679 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK), 680 XFS_FSB_TO_B(mp, 1)); 681 } 682 683 /* 684 * Removing an attribute. 685 * the inode: inode size 686 * the attribute btree could join: max depth * block size 687 * the inode bmap btree could join or split: max depth * block size 688 * And the bmap_finish transaction can free the attr blocks freed giving: 689 * the agf for the ag in which the blocks live: 2 * sector size 690 * the agfl for the ag in which the blocks live: 2 * sector size 691 * the superblock for the free block count: sector size 692 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 693 */ 694 STATIC uint 695 xfs_calc_attrrm_reservation( 696 struct xfs_mount *mp) 697 { 698 return XFS_DQUOT_LOGRES(mp) + 699 max((xfs_calc_inode_res(mp, 1) + 700 xfs_calc_buf_res(XFS_DA_NODE_MAXDEPTH, 701 XFS_FSB_TO_B(mp, 1)) + 702 (uint)XFS_FSB_TO_B(mp, 703 XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) + 704 xfs_calc_buf_res(XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK), 0)), 705 (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) + 706 xfs_calc_buf_res(xfs_allocfree_log_count(mp, 2), 707 XFS_FSB_TO_B(mp, 1)))); 708 } 709 710 /* 711 * Clearing a bad agino number in an agi hash bucket. 712 */ 713 STATIC uint 714 xfs_calc_clear_agi_bucket_reservation( 715 struct xfs_mount *mp) 716 { 717 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 718 } 719 720 /* 721 * Adjusting quota limits. 722 * the xfs_disk_dquot_t: sizeof(struct xfs_disk_dquot) 723 */ 724 STATIC uint 725 xfs_calc_qm_setqlim_reservation(void) 726 { 727 return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot)); 728 } 729 730 /* 731 * Allocating quota on disk if needed. 732 * the write transaction log space for quota file extent allocation 733 * the unit of quota allocation: one system block size 734 */ 735 STATIC uint 736 xfs_calc_qm_dqalloc_reservation( 737 struct xfs_mount *mp) 738 { 739 return xfs_calc_write_reservation(mp) + 740 xfs_calc_buf_res(1, 741 XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1); 742 } 743 744 /* 745 * Turning off quotas. 746 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 747 * the superblock for the quota flags: sector size 748 */ 749 STATIC uint 750 xfs_calc_qm_quotaoff_reservation( 751 struct xfs_mount *mp) 752 { 753 return sizeof(struct xfs_qoff_logitem) * 2 + 754 xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 755 } 756 757 /* 758 * End of turning off quotas. 759 * the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2 760 */ 761 STATIC uint 762 xfs_calc_qm_quotaoff_end_reservation(void) 763 { 764 return sizeof(struct xfs_qoff_logitem) * 2; 765 } 766 767 /* 768 * Syncing the incore super block changes to disk. 769 * the super block to reflect the changes: sector size 770 */ 771 STATIC uint 772 xfs_calc_sb_reservation( 773 struct xfs_mount *mp) 774 { 775 return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize); 776 } 777 778 void 779 xfs_trans_resv_calc( 780 struct xfs_mount *mp, 781 struct xfs_trans_resv *resp) 782 { 783 /* 784 * The following transactions are logged in physical format and 785 * require a permanent reservation on space. 786 */ 787 resp->tr_write.tr_logres = xfs_calc_write_reservation(mp); 788 if (xfs_sb_version_hasreflink(&mp->m_sb)) 789 resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; 790 else 791 resp->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT; 792 resp->tr_write.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 793 794 resp->tr_itruncate.tr_logres = xfs_calc_itruncate_reservation(mp); 795 if (xfs_sb_version_hasreflink(&mp->m_sb)) 796 resp->tr_itruncate.tr_logcount = 797 XFS_ITRUNCATE_LOG_COUNT_REFLINK; 798 else 799 resp->tr_itruncate.tr_logcount = XFS_ITRUNCATE_LOG_COUNT; 800 resp->tr_itruncate.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 801 802 resp->tr_rename.tr_logres = xfs_calc_rename_reservation(mp); 803 resp->tr_rename.tr_logcount = XFS_RENAME_LOG_COUNT; 804 resp->tr_rename.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 805 806 resp->tr_link.tr_logres = xfs_calc_link_reservation(mp); 807 resp->tr_link.tr_logcount = XFS_LINK_LOG_COUNT; 808 resp->tr_link.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 809 810 resp->tr_remove.tr_logres = xfs_calc_remove_reservation(mp); 811 resp->tr_remove.tr_logcount = XFS_REMOVE_LOG_COUNT; 812 resp->tr_remove.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 813 814 resp->tr_symlink.tr_logres = xfs_calc_symlink_reservation(mp); 815 resp->tr_symlink.tr_logcount = XFS_SYMLINK_LOG_COUNT; 816 resp->tr_symlink.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 817 818 resp->tr_create.tr_logres = xfs_calc_icreate_reservation(mp); 819 resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT; 820 resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 821 822 resp->tr_create_tmpfile.tr_logres = 823 xfs_calc_create_tmpfile_reservation(mp); 824 resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT; 825 resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 826 827 resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp); 828 resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT; 829 resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 830 831 resp->tr_ifree.tr_logres = xfs_calc_ifree_reservation(mp); 832 resp->tr_ifree.tr_logcount = XFS_INACTIVE_LOG_COUNT; 833 resp->tr_ifree.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 834 835 resp->tr_addafork.tr_logres = xfs_calc_addafork_reservation(mp); 836 resp->tr_addafork.tr_logcount = XFS_ADDAFORK_LOG_COUNT; 837 resp->tr_addafork.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 838 839 resp->tr_attrinval.tr_logres = xfs_calc_attrinval_reservation(mp); 840 resp->tr_attrinval.tr_logcount = XFS_ATTRINVAL_LOG_COUNT; 841 resp->tr_attrinval.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 842 843 resp->tr_attrsetm.tr_logres = xfs_calc_attrsetm_reservation(mp); 844 resp->tr_attrsetm.tr_logcount = XFS_ATTRSET_LOG_COUNT; 845 resp->tr_attrsetm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 846 847 resp->tr_attrrm.tr_logres = xfs_calc_attrrm_reservation(mp); 848 resp->tr_attrrm.tr_logcount = XFS_ATTRRM_LOG_COUNT; 849 resp->tr_attrrm.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 850 851 resp->tr_growrtalloc.tr_logres = xfs_calc_growrtalloc_reservation(mp); 852 resp->tr_growrtalloc.tr_logcount = XFS_DEFAULT_PERM_LOG_COUNT; 853 resp->tr_growrtalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 854 855 resp->tr_qm_dqalloc.tr_logres = xfs_calc_qm_dqalloc_reservation(mp); 856 if (xfs_sb_version_hasreflink(&mp->m_sb)) 857 resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK; 858 else 859 resp->tr_qm_dqalloc.tr_logcount = XFS_WRITE_LOG_COUNT; 860 resp->tr_qm_dqalloc.tr_logflags |= XFS_TRANS_PERM_LOG_RES; 861 862 /* 863 * The following transactions are logged in logical format with 864 * a default log count. 865 */ 866 resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation(); 867 resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT; 868 869 resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp); 870 resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 871 872 resp->tr_qm_equotaoff.tr_logres = 873 xfs_calc_qm_quotaoff_end_reservation(); 874 resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT; 875 876 resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp); 877 resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT; 878 879 /* The following transaction are logged in logical format */ 880 resp->tr_ichange.tr_logres = xfs_calc_ichange_reservation(mp); 881 resp->tr_growdata.tr_logres = xfs_calc_growdata_reservation(mp); 882 resp->tr_fsyncts.tr_logres = xfs_calc_swrite_reservation(mp); 883 resp->tr_writeid.tr_logres = xfs_calc_writeid_reservation(mp); 884 resp->tr_attrsetrt.tr_logres = xfs_calc_attrsetrt_reservation(mp); 885 resp->tr_clearagi.tr_logres = xfs_calc_clear_agi_bucket_reservation(mp); 886 resp->tr_growrtzero.tr_logres = xfs_calc_growrtzero_reservation(mp); 887 resp->tr_growrtfree.tr_logres = xfs_calc_growrtfree_reservation(mp); 888 } 889