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