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_types.h" 22 #include "xfs_log.h" 23 #include "xfs_trans.h" 24 #include "xfs_sb.h" 25 #include "xfs_ag.h" 26 #include "xfs_mount.h" 27 #include "xfs_error.h" 28 #include "xfs_da_btree.h" 29 #include "xfs_bmap_btree.h" 30 #include "xfs_alloc_btree.h" 31 #include "xfs_ialloc_btree.h" 32 #include "xfs_dinode.h" 33 #include "xfs_inode.h" 34 #include "xfs_btree.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_alloc.h" 37 #include "xfs_extent_busy.h" 38 #include "xfs_bmap.h" 39 #include "xfs_quota.h" 40 #include "xfs_trans_priv.h" 41 #include "xfs_trans_space.h" 42 #include "xfs_inode_item.h" 43 #include "xfs_trace.h" 44 45 kmem_zone_t *xfs_trans_zone; 46 kmem_zone_t *xfs_log_item_desc_zone; 47 48 49 /* 50 * Various log reservation values. 51 * 52 * These are based on the size of the file system block because that is what 53 * most transactions manipulate. Each adds in an additional 128 bytes per 54 * item logged to try to account for the overhead of the transaction mechanism. 55 * 56 * Note: Most of the reservations underestimate the number of allocation 57 * groups into which they could free extents in the xfs_bmap_finish() call. 58 * This is because the number in the worst case is quite high and quite 59 * unusual. In order to fix this we need to change xfs_bmap_finish() to free 60 * extents in only a single AG at a time. This will require changes to the 61 * EFI code as well, however, so that the EFI for the extents not freed is 62 * logged again in each transaction. See SGI PV #261917. 63 * 64 * Reservation functions here avoid a huge stack in xfs_trans_init due to 65 * register overflow from temporaries in the calculations. 66 */ 67 68 69 /* 70 * In a write transaction we can allocate a maximum of 2 71 * extents. This gives: 72 * the inode getting the new extents: inode size 73 * the inode's bmap btree: max depth * block size 74 * the agfs of the ags from which the extents are allocated: 2 * sector 75 * the superblock free block counter: sector size 76 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 77 * And the bmap_finish transaction can free bmap blocks in a join: 78 * the agfs of the ags containing the blocks: 2 * sector size 79 * the agfls of the ags containing the blocks: 2 * sector size 80 * the super block free block counter: sector size 81 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 82 */ 83 STATIC uint 84 xfs_calc_write_reservation( 85 struct xfs_mount *mp) 86 { 87 return XFS_DQUOT_LOGRES(mp) + 88 MAX((mp->m_sb.sb_inodesize + 89 XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK)) + 90 2 * mp->m_sb.sb_sectsize + 91 mp->m_sb.sb_sectsize + 92 XFS_ALLOCFREE_LOG_RES(mp, 2) + 93 128 * (4 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 94 XFS_ALLOCFREE_LOG_COUNT(mp, 2))), 95 (2 * mp->m_sb.sb_sectsize + 96 2 * mp->m_sb.sb_sectsize + 97 mp->m_sb.sb_sectsize + 98 XFS_ALLOCFREE_LOG_RES(mp, 2) + 99 128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2)))); 100 } 101 102 /* 103 * In truncating a file we free up to two extents at once. We can modify: 104 * the inode being truncated: inode size 105 * the inode's bmap btree: (max depth + 1) * block size 106 * And the bmap_finish transaction can free the blocks and bmap blocks: 107 * the agf for each of the ags: 4 * sector size 108 * the agfl for each of the ags: 4 * sector size 109 * the super block to reflect the freed blocks: sector size 110 * worst case split in allocation btrees per extent assuming 4 extents: 111 * 4 exts * 2 trees * (2 * max depth - 1) * block size 112 * the inode btree: max depth * blocksize 113 * the allocation btrees: 2 trees * (max depth - 1) * block size 114 */ 115 STATIC uint 116 xfs_calc_itruncate_reservation( 117 struct xfs_mount *mp) 118 { 119 return XFS_DQUOT_LOGRES(mp) + 120 MAX((mp->m_sb.sb_inodesize + 121 XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 1) + 122 128 * (2 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK))), 123 (4 * mp->m_sb.sb_sectsize + 124 4 * mp->m_sb.sb_sectsize + 125 mp->m_sb.sb_sectsize + 126 XFS_ALLOCFREE_LOG_RES(mp, 4) + 127 128 * (9 + XFS_ALLOCFREE_LOG_COUNT(mp, 4)) + 128 128 * 5 + 129 XFS_ALLOCFREE_LOG_RES(mp, 1) + 130 128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels + 131 XFS_ALLOCFREE_LOG_COUNT(mp, 1)))); 132 } 133 134 /* 135 * In renaming a files we can modify: 136 * the four inodes involved: 4 * inode size 137 * the two directory btrees: 2 * (max depth + v2) * dir block size 138 * the two directory bmap btrees: 2 * max depth * block size 139 * And the bmap_finish transaction can free dir and bmap blocks (two sets 140 * of bmap blocks) giving: 141 * the agf for the ags in which the blocks live: 3 * sector size 142 * the agfl for the ags in which the blocks live: 3 * sector size 143 * the superblock for the free block count: sector size 144 * the allocation btrees: 3 exts * 2 trees * (2 * max depth - 1) * block size 145 */ 146 STATIC uint 147 xfs_calc_rename_reservation( 148 struct xfs_mount *mp) 149 { 150 return XFS_DQUOT_LOGRES(mp) + 151 MAX((4 * mp->m_sb.sb_inodesize + 152 2 * XFS_DIROP_LOG_RES(mp) + 153 128 * (4 + 2 * XFS_DIROP_LOG_COUNT(mp))), 154 (3 * mp->m_sb.sb_sectsize + 155 3 * mp->m_sb.sb_sectsize + 156 mp->m_sb.sb_sectsize + 157 XFS_ALLOCFREE_LOG_RES(mp, 3) + 158 128 * (7 + XFS_ALLOCFREE_LOG_COUNT(mp, 3)))); 159 } 160 161 /* 162 * For creating a link to an inode: 163 * the parent directory inode: inode size 164 * the linked inode: inode size 165 * the directory btree could split: (max depth + v2) * dir block size 166 * the directory bmap btree could join or split: (max depth + v2) * blocksize 167 * And the bmap_finish transaction can free some bmap blocks giving: 168 * the agf for the ag in which the blocks live: sector size 169 * the agfl for the ag in which the blocks live: sector size 170 * the superblock for the free block count: sector size 171 * the allocation btrees: 2 trees * (2 * max depth - 1) * block size 172 */ 173 STATIC uint 174 xfs_calc_link_reservation( 175 struct xfs_mount *mp) 176 { 177 return XFS_DQUOT_LOGRES(mp) + 178 MAX((mp->m_sb.sb_inodesize + 179 mp->m_sb.sb_inodesize + 180 XFS_DIROP_LOG_RES(mp) + 181 128 * (2 + XFS_DIROP_LOG_COUNT(mp))), 182 (mp->m_sb.sb_sectsize + 183 mp->m_sb.sb_sectsize + 184 mp->m_sb.sb_sectsize + 185 XFS_ALLOCFREE_LOG_RES(mp, 1) + 186 128 * (3 + XFS_ALLOCFREE_LOG_COUNT(mp, 1)))); 187 } 188 189 /* 190 * For removing a directory entry we can modify: 191 * the parent directory inode: inode size 192 * the removed inode: inode size 193 * the directory btree could join: (max depth + v2) * dir block size 194 * the directory bmap btree could join or split: (max depth + v2) * blocksize 195 * And the bmap_finish transaction can free the dir and bmap blocks giving: 196 * the agf for the ag in which the blocks live: 2 * sector size 197 * the agfl for the ag in which the blocks live: 2 * sector size 198 * the superblock for the free block count: sector size 199 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 200 */ 201 STATIC uint 202 xfs_calc_remove_reservation( 203 struct xfs_mount *mp) 204 { 205 return XFS_DQUOT_LOGRES(mp) + 206 MAX((mp->m_sb.sb_inodesize + 207 mp->m_sb.sb_inodesize + 208 XFS_DIROP_LOG_RES(mp) + 209 128 * (2 + XFS_DIROP_LOG_COUNT(mp))), 210 (2 * mp->m_sb.sb_sectsize + 211 2 * mp->m_sb.sb_sectsize + 212 mp->m_sb.sb_sectsize + 213 XFS_ALLOCFREE_LOG_RES(mp, 2) + 214 128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2)))); 215 } 216 217 /* 218 * For symlink we can modify: 219 * the parent directory inode: inode size 220 * the new inode: inode size 221 * the inode btree entry: 1 block 222 * the directory btree: (max depth + v2) * dir block size 223 * the directory inode's bmap btree: (max depth + v2) * block size 224 * the blocks for the symlink: 1 kB 225 * Or in the first xact we allocate some inodes giving: 226 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 227 * the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize 228 * the inode btree: max depth * blocksize 229 * the allocation btrees: 2 trees * (2 * max depth - 1) * block size 230 */ 231 STATIC uint 232 xfs_calc_symlink_reservation( 233 struct xfs_mount *mp) 234 { 235 return XFS_DQUOT_LOGRES(mp) + 236 MAX((mp->m_sb.sb_inodesize + 237 mp->m_sb.sb_inodesize + 238 XFS_FSB_TO_B(mp, 1) + 239 XFS_DIROP_LOG_RES(mp) + 240 1024 + 241 128 * (4 + XFS_DIROP_LOG_COUNT(mp))), 242 (2 * mp->m_sb.sb_sectsize + 243 XFS_FSB_TO_B(mp, XFS_IALLOC_BLOCKS(mp)) + 244 XFS_FSB_TO_B(mp, mp->m_in_maxlevels) + 245 XFS_ALLOCFREE_LOG_RES(mp, 1) + 246 128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels + 247 XFS_ALLOCFREE_LOG_COUNT(mp, 1)))); 248 } 249 250 /* 251 * For create we can modify: 252 * the parent directory inode: inode size 253 * the new inode: inode size 254 * the inode btree entry: block size 255 * the superblock for the nlink flag: sector size 256 * the directory btree: (max depth + v2) * dir block size 257 * the directory inode's bmap btree: (max depth + v2) * block size 258 * Or in the first xact we allocate some inodes giving: 259 * the agi and agf of the ag getting the new inodes: 2 * sectorsize 260 * the superblock for the nlink flag: sector size 261 * the inode blocks allocated: XFS_IALLOC_BLOCKS * blocksize 262 * the inode btree: max depth * blocksize 263 * the allocation btrees: 2 trees * (max depth - 1) * block size 264 */ 265 STATIC uint 266 xfs_calc_create_reservation( 267 struct xfs_mount *mp) 268 { 269 return XFS_DQUOT_LOGRES(mp) + 270 MAX((mp->m_sb.sb_inodesize + 271 mp->m_sb.sb_inodesize + 272 mp->m_sb.sb_sectsize + 273 XFS_FSB_TO_B(mp, 1) + 274 XFS_DIROP_LOG_RES(mp) + 275 128 * (3 + XFS_DIROP_LOG_COUNT(mp))), 276 (3 * mp->m_sb.sb_sectsize + 277 XFS_FSB_TO_B(mp, XFS_IALLOC_BLOCKS(mp)) + 278 XFS_FSB_TO_B(mp, mp->m_in_maxlevels) + 279 XFS_ALLOCFREE_LOG_RES(mp, 1) + 280 128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels + 281 XFS_ALLOCFREE_LOG_COUNT(mp, 1)))); 282 } 283 284 /* 285 * Making a new directory is the same as creating a new file. 286 */ 287 STATIC uint 288 xfs_calc_mkdir_reservation( 289 struct xfs_mount *mp) 290 { 291 return xfs_calc_create_reservation(mp); 292 } 293 294 /* 295 * In freeing an inode we can modify: 296 * the inode being freed: inode size 297 * the super block free inode counter: sector size 298 * the agi hash list and counters: sector size 299 * the inode btree entry: block size 300 * the on disk inode before ours in the agi hash list: inode cluster size 301 * the inode btree: max depth * blocksize 302 * the allocation btrees: 2 trees * (max depth - 1) * block size 303 */ 304 STATIC uint 305 xfs_calc_ifree_reservation( 306 struct xfs_mount *mp) 307 { 308 return XFS_DQUOT_LOGRES(mp) + 309 mp->m_sb.sb_inodesize + 310 mp->m_sb.sb_sectsize + 311 mp->m_sb.sb_sectsize + 312 XFS_FSB_TO_B(mp, 1) + 313 MAX((__uint16_t)XFS_FSB_TO_B(mp, 1), 314 XFS_INODE_CLUSTER_SIZE(mp)) + 315 128 * 5 + 316 XFS_ALLOCFREE_LOG_RES(mp, 1) + 317 128 * (2 + XFS_IALLOC_BLOCKS(mp) + mp->m_in_maxlevels + 318 XFS_ALLOCFREE_LOG_COUNT(mp, 1)); 319 } 320 321 /* 322 * When only changing the inode we log the inode and possibly the superblock 323 * We also add a bit of slop for the transaction stuff. 324 */ 325 STATIC uint 326 xfs_calc_ichange_reservation( 327 struct xfs_mount *mp) 328 { 329 return XFS_DQUOT_LOGRES(mp) + 330 mp->m_sb.sb_inodesize + 331 mp->m_sb.sb_sectsize + 332 512; 333 334 } 335 336 /* 337 * Growing the data section of the filesystem. 338 * superblock 339 * agi and agf 340 * allocation btrees 341 */ 342 STATIC uint 343 xfs_calc_growdata_reservation( 344 struct xfs_mount *mp) 345 { 346 return mp->m_sb.sb_sectsize * 3 + 347 XFS_ALLOCFREE_LOG_RES(mp, 1) + 348 128 * (3 + XFS_ALLOCFREE_LOG_COUNT(mp, 1)); 349 } 350 351 /* 352 * Growing the rt section of the filesystem. 353 * In the first set of transactions (ALLOC) we allocate space to the 354 * bitmap or summary files. 355 * superblock: sector size 356 * agf of the ag from which the extent is allocated: sector size 357 * bmap btree for bitmap/summary inode: max depth * blocksize 358 * bitmap/summary inode: inode size 359 * allocation btrees for 1 block alloc: 2 * (2 * maxdepth - 1) * blocksize 360 */ 361 STATIC uint 362 xfs_calc_growrtalloc_reservation( 363 struct xfs_mount *mp) 364 { 365 return 2 * mp->m_sb.sb_sectsize + 366 XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK)) + 367 mp->m_sb.sb_inodesize + 368 XFS_ALLOCFREE_LOG_RES(mp, 1) + 369 128 * (3 + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) + 370 XFS_ALLOCFREE_LOG_COUNT(mp, 1)); 371 } 372 373 /* 374 * Growing the rt section of the filesystem. 375 * In the second set of transactions (ZERO) we zero the new metadata blocks. 376 * one bitmap/summary block: blocksize 377 */ 378 STATIC uint 379 xfs_calc_growrtzero_reservation( 380 struct xfs_mount *mp) 381 { 382 return mp->m_sb.sb_blocksize + 128; 383 } 384 385 /* 386 * Growing the rt section of the filesystem. 387 * In the third set of transactions (FREE) we update metadata without 388 * allocating any new blocks. 389 * superblock: sector size 390 * bitmap inode: inode size 391 * summary inode: inode size 392 * one bitmap block: blocksize 393 * summary blocks: new summary size 394 */ 395 STATIC uint 396 xfs_calc_growrtfree_reservation( 397 struct xfs_mount *mp) 398 { 399 return mp->m_sb.sb_sectsize + 400 2 * mp->m_sb.sb_inodesize + 401 mp->m_sb.sb_blocksize + 402 mp->m_rsumsize + 403 128 * 5; 404 } 405 406 /* 407 * Logging the inode modification timestamp on a synchronous write. 408 * inode 409 */ 410 STATIC uint 411 xfs_calc_swrite_reservation( 412 struct xfs_mount *mp) 413 { 414 return mp->m_sb.sb_inodesize + 128; 415 } 416 417 /* 418 * Logging the inode mode bits when writing a setuid/setgid file 419 * inode 420 */ 421 STATIC uint 422 xfs_calc_writeid_reservation(xfs_mount_t *mp) 423 { 424 return mp->m_sb.sb_inodesize + 128; 425 } 426 427 /* 428 * Converting the inode from non-attributed to attributed. 429 * the inode being converted: inode size 430 * agf block and superblock (for block allocation) 431 * the new block (directory sized) 432 * bmap blocks for the new directory block 433 * allocation btrees 434 */ 435 STATIC uint 436 xfs_calc_addafork_reservation( 437 struct xfs_mount *mp) 438 { 439 return XFS_DQUOT_LOGRES(mp) + 440 mp->m_sb.sb_inodesize + 441 mp->m_sb.sb_sectsize * 2 + 442 mp->m_dirblksize + 443 XFS_FSB_TO_B(mp, XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1) + 444 XFS_ALLOCFREE_LOG_RES(mp, 1) + 445 128 * (4 + XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK) + 1 + 446 XFS_ALLOCFREE_LOG_COUNT(mp, 1)); 447 } 448 449 /* 450 * Removing the attribute fork of a file 451 * the inode being truncated: inode size 452 * the inode's bmap btree: max depth * block size 453 * And the bmap_finish transaction can free the blocks and bmap blocks: 454 * the agf for each of the ags: 4 * sector size 455 * the agfl for each of the ags: 4 * sector size 456 * the super block to reflect the freed blocks: sector size 457 * worst case split in allocation btrees per extent assuming 4 extents: 458 * 4 exts * 2 trees * (2 * max depth - 1) * block size 459 */ 460 STATIC uint 461 xfs_calc_attrinval_reservation( 462 struct xfs_mount *mp) 463 { 464 return MAX((mp->m_sb.sb_inodesize + 465 XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) + 466 128 * (1 + XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK))), 467 (4 * mp->m_sb.sb_sectsize + 468 4 * mp->m_sb.sb_sectsize + 469 mp->m_sb.sb_sectsize + 470 XFS_ALLOCFREE_LOG_RES(mp, 4) + 471 128 * (9 + XFS_ALLOCFREE_LOG_COUNT(mp, 4)))); 472 } 473 474 /* 475 * Setting an attribute. 476 * the inode getting the attribute 477 * the superblock for allocations 478 * the agfs extents are allocated from 479 * the attribute btree * max depth 480 * the inode allocation btree 481 * Since attribute transaction space is dependent on the size of the attribute, 482 * the calculation is done partially at mount time and partially at runtime. 483 */ 484 STATIC uint 485 xfs_calc_attrset_reservation( 486 struct xfs_mount *mp) 487 { 488 return XFS_DQUOT_LOGRES(mp) + 489 mp->m_sb.sb_inodesize + 490 mp->m_sb.sb_sectsize + 491 XFS_FSB_TO_B(mp, XFS_DA_NODE_MAXDEPTH) + 492 128 * (2 + XFS_DA_NODE_MAXDEPTH); 493 } 494 495 /* 496 * Removing an attribute. 497 * the inode: inode size 498 * the attribute btree could join: max depth * block size 499 * the inode bmap btree could join or split: max depth * block size 500 * And the bmap_finish transaction can free the attr blocks freed giving: 501 * the agf for the ag in which the blocks live: 2 * sector size 502 * the agfl for the ag in which the blocks live: 2 * sector size 503 * the superblock for the free block count: sector size 504 * the allocation btrees: 2 exts * 2 trees * (2 * max depth - 1) * block size 505 */ 506 STATIC uint 507 xfs_calc_attrrm_reservation( 508 struct xfs_mount *mp) 509 { 510 return XFS_DQUOT_LOGRES(mp) + 511 MAX((mp->m_sb.sb_inodesize + 512 XFS_FSB_TO_B(mp, XFS_DA_NODE_MAXDEPTH) + 513 XFS_FSB_TO_B(mp, XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)) + 514 128 * (1 + XFS_DA_NODE_MAXDEPTH + 515 XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK))), 516 (2 * mp->m_sb.sb_sectsize + 517 2 * mp->m_sb.sb_sectsize + 518 mp->m_sb.sb_sectsize + 519 XFS_ALLOCFREE_LOG_RES(mp, 2) + 520 128 * (5 + XFS_ALLOCFREE_LOG_COUNT(mp, 2)))); 521 } 522 523 /* 524 * Clearing a bad agino number in an agi hash bucket. 525 */ 526 STATIC uint 527 xfs_calc_clear_agi_bucket_reservation( 528 struct xfs_mount *mp) 529 { 530 return mp->m_sb.sb_sectsize + 128; 531 } 532 533 /* 534 * Initialize the precomputed transaction reservation values 535 * in the mount structure. 536 */ 537 void 538 xfs_trans_init( 539 struct xfs_mount *mp) 540 { 541 struct xfs_trans_reservations *resp = &mp->m_reservations; 542 543 resp->tr_write = xfs_calc_write_reservation(mp); 544 resp->tr_itruncate = xfs_calc_itruncate_reservation(mp); 545 resp->tr_rename = xfs_calc_rename_reservation(mp); 546 resp->tr_link = xfs_calc_link_reservation(mp); 547 resp->tr_remove = xfs_calc_remove_reservation(mp); 548 resp->tr_symlink = xfs_calc_symlink_reservation(mp); 549 resp->tr_create = xfs_calc_create_reservation(mp); 550 resp->tr_mkdir = xfs_calc_mkdir_reservation(mp); 551 resp->tr_ifree = xfs_calc_ifree_reservation(mp); 552 resp->tr_ichange = xfs_calc_ichange_reservation(mp); 553 resp->tr_growdata = xfs_calc_growdata_reservation(mp); 554 resp->tr_swrite = xfs_calc_swrite_reservation(mp); 555 resp->tr_writeid = xfs_calc_writeid_reservation(mp); 556 resp->tr_addafork = xfs_calc_addafork_reservation(mp); 557 resp->tr_attrinval = xfs_calc_attrinval_reservation(mp); 558 resp->tr_attrset = xfs_calc_attrset_reservation(mp); 559 resp->tr_attrrm = xfs_calc_attrrm_reservation(mp); 560 resp->tr_clearagi = xfs_calc_clear_agi_bucket_reservation(mp); 561 resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp); 562 resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp); 563 resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp); 564 } 565 566 /* 567 * This routine is called to allocate a transaction structure. 568 * The type parameter indicates the type of the transaction. These 569 * are enumerated in xfs_trans.h. 570 * 571 * Dynamically allocate the transaction structure from the transaction 572 * zone, initialize it, and return it to the caller. 573 */ 574 xfs_trans_t * 575 xfs_trans_alloc( 576 xfs_mount_t *mp, 577 uint type) 578 { 579 xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); 580 return _xfs_trans_alloc(mp, type, KM_SLEEP); 581 } 582 583 xfs_trans_t * 584 _xfs_trans_alloc( 585 xfs_mount_t *mp, 586 uint type, 587 xfs_km_flags_t memflags) 588 { 589 xfs_trans_t *tp; 590 591 atomic_inc(&mp->m_active_trans); 592 593 tp = kmem_zone_zalloc(xfs_trans_zone, memflags); 594 tp->t_magic = XFS_TRANS_MAGIC; 595 tp->t_type = type; 596 tp->t_mountp = mp; 597 INIT_LIST_HEAD(&tp->t_items); 598 INIT_LIST_HEAD(&tp->t_busy); 599 return tp; 600 } 601 602 /* 603 * Free the transaction structure. If there is more clean up 604 * to do when the structure is freed, add it here. 605 */ 606 STATIC void 607 xfs_trans_free( 608 struct xfs_trans *tp) 609 { 610 xfs_extent_busy_sort(&tp->t_busy); 611 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false); 612 613 atomic_dec(&tp->t_mountp->m_active_trans); 614 xfs_trans_free_dqinfo(tp); 615 kmem_zone_free(xfs_trans_zone, tp); 616 } 617 618 /* 619 * This is called to create a new transaction which will share the 620 * permanent log reservation of the given transaction. The remaining 621 * unused block and rt extent reservations are also inherited. This 622 * implies that the original transaction is no longer allowed to allocate 623 * blocks. Locks and log items, however, are no inherited. They must 624 * be added to the new transaction explicitly. 625 */ 626 xfs_trans_t * 627 xfs_trans_dup( 628 xfs_trans_t *tp) 629 { 630 xfs_trans_t *ntp; 631 632 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); 633 634 /* 635 * Initialize the new transaction structure. 636 */ 637 ntp->t_magic = XFS_TRANS_MAGIC; 638 ntp->t_type = tp->t_type; 639 ntp->t_mountp = tp->t_mountp; 640 INIT_LIST_HEAD(&ntp->t_items); 641 INIT_LIST_HEAD(&ntp->t_busy); 642 643 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); 644 ASSERT(tp->t_ticket != NULL); 645 646 ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE); 647 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket); 648 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used; 649 tp->t_blk_res = tp->t_blk_res_used; 650 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used; 651 tp->t_rtx_res = tp->t_rtx_res_used; 652 ntp->t_pflags = tp->t_pflags; 653 654 xfs_trans_dup_dqinfo(tp, ntp); 655 656 atomic_inc(&tp->t_mountp->m_active_trans); 657 return ntp; 658 } 659 660 /* 661 * This is called to reserve free disk blocks and log space for the 662 * given transaction. This must be done before allocating any resources 663 * within the transaction. 664 * 665 * This will return ENOSPC if there are not enough blocks available. 666 * It will sleep waiting for available log space. 667 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which 668 * is used by long running transactions. If any one of the reservations 669 * fails then they will all be backed out. 670 * 671 * This does not do quota reservations. That typically is done by the 672 * caller afterwards. 673 */ 674 int 675 xfs_trans_reserve( 676 xfs_trans_t *tp, 677 uint blocks, 678 uint logspace, 679 uint rtextents, 680 uint flags, 681 uint logcount) 682 { 683 int error = 0; 684 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; 685 686 /* Mark this thread as being in a transaction */ 687 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); 688 689 /* 690 * Attempt to reserve the needed disk blocks by decrementing 691 * the number needed from the number available. This will 692 * fail if the count would go below zero. 693 */ 694 if (blocks > 0) { 695 error = xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS, 696 -((int64_t)blocks), rsvd); 697 if (error != 0) { 698 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); 699 return (XFS_ERROR(ENOSPC)); 700 } 701 tp->t_blk_res += blocks; 702 } 703 704 /* 705 * Reserve the log space needed for this transaction. 706 */ 707 if (logspace > 0) { 708 bool permanent = false; 709 710 ASSERT(tp->t_log_res == 0 || tp->t_log_res == logspace); 711 ASSERT(tp->t_log_count == 0 || tp->t_log_count == logcount); 712 713 if (flags & XFS_TRANS_PERM_LOG_RES) { 714 tp->t_flags |= XFS_TRANS_PERM_LOG_RES; 715 permanent = true; 716 } else { 717 ASSERT(tp->t_ticket == NULL); 718 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES)); 719 } 720 721 if (tp->t_ticket != NULL) { 722 ASSERT(flags & XFS_TRANS_PERM_LOG_RES); 723 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket); 724 } else { 725 error = xfs_log_reserve(tp->t_mountp, logspace, 726 logcount, &tp->t_ticket, 727 XFS_TRANSACTION, permanent, 728 tp->t_type); 729 } 730 731 if (error) 732 goto undo_blocks; 733 734 tp->t_log_res = logspace; 735 tp->t_log_count = logcount; 736 } 737 738 /* 739 * Attempt to reserve the needed realtime extents by decrementing 740 * the number needed from the number available. This will 741 * fail if the count would go below zero. 742 */ 743 if (rtextents > 0) { 744 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS, 745 -((int64_t)rtextents), rsvd); 746 if (error) { 747 error = XFS_ERROR(ENOSPC); 748 goto undo_log; 749 } 750 tp->t_rtx_res += rtextents; 751 } 752 753 return 0; 754 755 /* 756 * Error cases jump to one of these labels to undo any 757 * reservations which have already been performed. 758 */ 759 undo_log: 760 if (logspace > 0) { 761 int log_flags; 762 763 if (flags & XFS_TRANS_PERM_LOG_RES) { 764 log_flags = XFS_LOG_REL_PERM_RESERV; 765 } else { 766 log_flags = 0; 767 } 768 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags); 769 tp->t_ticket = NULL; 770 tp->t_log_res = 0; 771 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES; 772 } 773 774 undo_blocks: 775 if (blocks > 0) { 776 xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS, 777 (int64_t)blocks, rsvd); 778 tp->t_blk_res = 0; 779 } 780 781 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); 782 783 return error; 784 } 785 786 /* 787 * Record the indicated change to the given field for application 788 * to the file system's superblock when the transaction commits. 789 * For now, just store the change in the transaction structure. 790 * 791 * Mark the transaction structure to indicate that the superblock 792 * needs to be updated before committing. 793 * 794 * Because we may not be keeping track of allocated/free inodes and 795 * used filesystem blocks in the superblock, we do not mark the 796 * superblock dirty in this transaction if we modify these fields. 797 * We still need to update the transaction deltas so that they get 798 * applied to the incore superblock, but we don't want them to 799 * cause the superblock to get locked and logged if these are the 800 * only fields in the superblock that the transaction modifies. 801 */ 802 void 803 xfs_trans_mod_sb( 804 xfs_trans_t *tp, 805 uint field, 806 int64_t delta) 807 { 808 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY); 809 xfs_mount_t *mp = tp->t_mountp; 810 811 switch (field) { 812 case XFS_TRANS_SB_ICOUNT: 813 tp->t_icount_delta += delta; 814 if (xfs_sb_version_haslazysbcount(&mp->m_sb)) 815 flags &= ~XFS_TRANS_SB_DIRTY; 816 break; 817 case XFS_TRANS_SB_IFREE: 818 tp->t_ifree_delta += delta; 819 if (xfs_sb_version_haslazysbcount(&mp->m_sb)) 820 flags &= ~XFS_TRANS_SB_DIRTY; 821 break; 822 case XFS_TRANS_SB_FDBLOCKS: 823 /* 824 * Track the number of blocks allocated in the 825 * transaction. Make sure it does not exceed the 826 * number reserved. 827 */ 828 if (delta < 0) { 829 tp->t_blk_res_used += (uint)-delta; 830 ASSERT(tp->t_blk_res_used <= tp->t_blk_res); 831 } 832 tp->t_fdblocks_delta += delta; 833 if (xfs_sb_version_haslazysbcount(&mp->m_sb)) 834 flags &= ~XFS_TRANS_SB_DIRTY; 835 break; 836 case XFS_TRANS_SB_RES_FDBLOCKS: 837 /* 838 * The allocation has already been applied to the 839 * in-core superblock's counter. This should only 840 * be applied to the on-disk superblock. 841 */ 842 ASSERT(delta < 0); 843 tp->t_res_fdblocks_delta += delta; 844 if (xfs_sb_version_haslazysbcount(&mp->m_sb)) 845 flags &= ~XFS_TRANS_SB_DIRTY; 846 break; 847 case XFS_TRANS_SB_FREXTENTS: 848 /* 849 * Track the number of blocks allocated in the 850 * transaction. Make sure it does not exceed the 851 * number reserved. 852 */ 853 if (delta < 0) { 854 tp->t_rtx_res_used += (uint)-delta; 855 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res); 856 } 857 tp->t_frextents_delta += delta; 858 break; 859 case XFS_TRANS_SB_RES_FREXTENTS: 860 /* 861 * The allocation has already been applied to the 862 * in-core superblock's counter. This should only 863 * be applied to the on-disk superblock. 864 */ 865 ASSERT(delta < 0); 866 tp->t_res_frextents_delta += delta; 867 break; 868 case XFS_TRANS_SB_DBLOCKS: 869 ASSERT(delta > 0); 870 tp->t_dblocks_delta += delta; 871 break; 872 case XFS_TRANS_SB_AGCOUNT: 873 ASSERT(delta > 0); 874 tp->t_agcount_delta += delta; 875 break; 876 case XFS_TRANS_SB_IMAXPCT: 877 tp->t_imaxpct_delta += delta; 878 break; 879 case XFS_TRANS_SB_REXTSIZE: 880 tp->t_rextsize_delta += delta; 881 break; 882 case XFS_TRANS_SB_RBMBLOCKS: 883 tp->t_rbmblocks_delta += delta; 884 break; 885 case XFS_TRANS_SB_RBLOCKS: 886 tp->t_rblocks_delta += delta; 887 break; 888 case XFS_TRANS_SB_REXTENTS: 889 tp->t_rextents_delta += delta; 890 break; 891 case XFS_TRANS_SB_REXTSLOG: 892 tp->t_rextslog_delta += delta; 893 break; 894 default: 895 ASSERT(0); 896 return; 897 } 898 899 tp->t_flags |= flags; 900 } 901 902 /* 903 * xfs_trans_apply_sb_deltas() is called from the commit code 904 * to bring the superblock buffer into the current transaction 905 * and modify it as requested by earlier calls to xfs_trans_mod_sb(). 906 * 907 * For now we just look at each field allowed to change and change 908 * it if necessary. 909 */ 910 STATIC void 911 xfs_trans_apply_sb_deltas( 912 xfs_trans_t *tp) 913 { 914 xfs_dsb_t *sbp; 915 xfs_buf_t *bp; 916 int whole = 0; 917 918 bp = xfs_trans_getsb(tp, tp->t_mountp, 0); 919 sbp = XFS_BUF_TO_SBP(bp); 920 921 /* 922 * Check that superblock mods match the mods made to AGF counters. 923 */ 924 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) == 925 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta + 926 tp->t_ag_btree_delta)); 927 928 /* 929 * Only update the superblock counters if we are logging them 930 */ 931 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) { 932 if (tp->t_icount_delta) 933 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta); 934 if (tp->t_ifree_delta) 935 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta); 936 if (tp->t_fdblocks_delta) 937 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta); 938 if (tp->t_res_fdblocks_delta) 939 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta); 940 } 941 942 if (tp->t_frextents_delta) 943 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta); 944 if (tp->t_res_frextents_delta) 945 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta); 946 947 if (tp->t_dblocks_delta) { 948 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta); 949 whole = 1; 950 } 951 if (tp->t_agcount_delta) { 952 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta); 953 whole = 1; 954 } 955 if (tp->t_imaxpct_delta) { 956 sbp->sb_imax_pct += tp->t_imaxpct_delta; 957 whole = 1; 958 } 959 if (tp->t_rextsize_delta) { 960 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta); 961 whole = 1; 962 } 963 if (tp->t_rbmblocks_delta) { 964 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta); 965 whole = 1; 966 } 967 if (tp->t_rblocks_delta) { 968 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta); 969 whole = 1; 970 } 971 if (tp->t_rextents_delta) { 972 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta); 973 whole = 1; 974 } 975 if (tp->t_rextslog_delta) { 976 sbp->sb_rextslog += tp->t_rextslog_delta; 977 whole = 1; 978 } 979 980 if (whole) 981 /* 982 * Log the whole thing, the fields are noncontiguous. 983 */ 984 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1); 985 else 986 /* 987 * Since all the modifiable fields are contiguous, we 988 * can get away with this. 989 */ 990 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount), 991 offsetof(xfs_dsb_t, sb_frextents) + 992 sizeof(sbp->sb_frextents) - 1); 993 } 994 995 /* 996 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations 997 * and apply superblock counter changes to the in-core superblock. The 998 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT 999 * applied to the in-core superblock. The idea is that that has already been 1000 * done. 1001 * 1002 * This is done efficiently with a single call to xfs_mod_incore_sb_batch(). 1003 * However, we have to ensure that we only modify each superblock field only 1004 * once because the application of the delta values may not be atomic. That can 1005 * lead to ENOSPC races occurring if we have two separate modifcations of the 1006 * free space counter to put back the entire reservation and then take away 1007 * what we used. 1008 * 1009 * If we are not logging superblock counters, then the inode allocated/free and 1010 * used block counts are not updated in the on disk superblock. In this case, 1011 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we 1012 * still need to update the incore superblock with the changes. 1013 */ 1014 void 1015 xfs_trans_unreserve_and_mod_sb( 1016 xfs_trans_t *tp) 1017 { 1018 xfs_mod_sb_t msb[9]; /* If you add cases, add entries */ 1019 xfs_mod_sb_t *msbp; 1020 xfs_mount_t *mp = tp->t_mountp; 1021 /* REFERENCED */ 1022 int error; 1023 int rsvd; 1024 int64_t blkdelta = 0; 1025 int64_t rtxdelta = 0; 1026 int64_t idelta = 0; 1027 int64_t ifreedelta = 0; 1028 1029 msbp = msb; 1030 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; 1031 1032 /* calculate deltas */ 1033 if (tp->t_blk_res > 0) 1034 blkdelta = tp->t_blk_res; 1035 if ((tp->t_fdblocks_delta != 0) && 1036 (xfs_sb_version_haslazysbcount(&mp->m_sb) || 1037 (tp->t_flags & XFS_TRANS_SB_DIRTY))) 1038 blkdelta += tp->t_fdblocks_delta; 1039 1040 if (tp->t_rtx_res > 0) 1041 rtxdelta = tp->t_rtx_res; 1042 if ((tp->t_frextents_delta != 0) && 1043 (tp->t_flags & XFS_TRANS_SB_DIRTY)) 1044 rtxdelta += tp->t_frextents_delta; 1045 1046 if (xfs_sb_version_haslazysbcount(&mp->m_sb) || 1047 (tp->t_flags & XFS_TRANS_SB_DIRTY)) { 1048 idelta = tp->t_icount_delta; 1049 ifreedelta = tp->t_ifree_delta; 1050 } 1051 1052 /* apply the per-cpu counters */ 1053 if (blkdelta) { 1054 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, 1055 blkdelta, rsvd); 1056 if (error) 1057 goto out; 1058 } 1059 1060 if (idelta) { 1061 error = xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, 1062 idelta, rsvd); 1063 if (error) 1064 goto out_undo_fdblocks; 1065 } 1066 1067 if (ifreedelta) { 1068 error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, 1069 ifreedelta, rsvd); 1070 if (error) 1071 goto out_undo_icount; 1072 } 1073 1074 /* apply remaining deltas */ 1075 if (rtxdelta != 0) { 1076 msbp->msb_field = XFS_SBS_FREXTENTS; 1077 msbp->msb_delta = rtxdelta; 1078 msbp++; 1079 } 1080 1081 if (tp->t_flags & XFS_TRANS_SB_DIRTY) { 1082 if (tp->t_dblocks_delta != 0) { 1083 msbp->msb_field = XFS_SBS_DBLOCKS; 1084 msbp->msb_delta = tp->t_dblocks_delta; 1085 msbp++; 1086 } 1087 if (tp->t_agcount_delta != 0) { 1088 msbp->msb_field = XFS_SBS_AGCOUNT; 1089 msbp->msb_delta = tp->t_agcount_delta; 1090 msbp++; 1091 } 1092 if (tp->t_imaxpct_delta != 0) { 1093 msbp->msb_field = XFS_SBS_IMAX_PCT; 1094 msbp->msb_delta = tp->t_imaxpct_delta; 1095 msbp++; 1096 } 1097 if (tp->t_rextsize_delta != 0) { 1098 msbp->msb_field = XFS_SBS_REXTSIZE; 1099 msbp->msb_delta = tp->t_rextsize_delta; 1100 msbp++; 1101 } 1102 if (tp->t_rbmblocks_delta != 0) { 1103 msbp->msb_field = XFS_SBS_RBMBLOCKS; 1104 msbp->msb_delta = tp->t_rbmblocks_delta; 1105 msbp++; 1106 } 1107 if (tp->t_rblocks_delta != 0) { 1108 msbp->msb_field = XFS_SBS_RBLOCKS; 1109 msbp->msb_delta = tp->t_rblocks_delta; 1110 msbp++; 1111 } 1112 if (tp->t_rextents_delta != 0) { 1113 msbp->msb_field = XFS_SBS_REXTENTS; 1114 msbp->msb_delta = tp->t_rextents_delta; 1115 msbp++; 1116 } 1117 if (tp->t_rextslog_delta != 0) { 1118 msbp->msb_field = XFS_SBS_REXTSLOG; 1119 msbp->msb_delta = tp->t_rextslog_delta; 1120 msbp++; 1121 } 1122 } 1123 1124 /* 1125 * If we need to change anything, do it. 1126 */ 1127 if (msbp > msb) { 1128 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb, 1129 (uint)(msbp - msb), rsvd); 1130 if (error) 1131 goto out_undo_ifreecount; 1132 } 1133 1134 return; 1135 1136 out_undo_ifreecount: 1137 if (ifreedelta) 1138 xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd); 1139 out_undo_icount: 1140 if (idelta) 1141 xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, -idelta, rsvd); 1142 out_undo_fdblocks: 1143 if (blkdelta) 1144 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, -blkdelta, rsvd); 1145 out: 1146 ASSERT(error == 0); 1147 return; 1148 } 1149 1150 /* 1151 * Add the given log item to the transaction's list of log items. 1152 * 1153 * The log item will now point to its new descriptor with its li_desc field. 1154 */ 1155 void 1156 xfs_trans_add_item( 1157 struct xfs_trans *tp, 1158 struct xfs_log_item *lip) 1159 { 1160 struct xfs_log_item_desc *lidp; 1161 1162 ASSERT(lip->li_mountp == tp->t_mountp); 1163 ASSERT(lip->li_ailp == tp->t_mountp->m_ail); 1164 1165 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS); 1166 1167 lidp->lid_item = lip; 1168 lidp->lid_flags = 0; 1169 list_add_tail(&lidp->lid_trans, &tp->t_items); 1170 1171 lip->li_desc = lidp; 1172 } 1173 1174 STATIC void 1175 xfs_trans_free_item_desc( 1176 struct xfs_log_item_desc *lidp) 1177 { 1178 list_del_init(&lidp->lid_trans); 1179 kmem_zone_free(xfs_log_item_desc_zone, lidp); 1180 } 1181 1182 /* 1183 * Unlink and free the given descriptor. 1184 */ 1185 void 1186 xfs_trans_del_item( 1187 struct xfs_log_item *lip) 1188 { 1189 xfs_trans_free_item_desc(lip->li_desc); 1190 lip->li_desc = NULL; 1191 } 1192 1193 /* 1194 * Unlock all of the items of a transaction and free all the descriptors 1195 * of that transaction. 1196 */ 1197 void 1198 xfs_trans_free_items( 1199 struct xfs_trans *tp, 1200 xfs_lsn_t commit_lsn, 1201 int flags) 1202 { 1203 struct xfs_log_item_desc *lidp, *next; 1204 1205 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) { 1206 struct xfs_log_item *lip = lidp->lid_item; 1207 1208 lip->li_desc = NULL; 1209 1210 if (commit_lsn != NULLCOMMITLSN) 1211 IOP_COMMITTING(lip, commit_lsn); 1212 if (flags & XFS_TRANS_ABORT) 1213 lip->li_flags |= XFS_LI_ABORTED; 1214 IOP_UNLOCK(lip); 1215 1216 xfs_trans_free_item_desc(lidp); 1217 } 1218 } 1219 1220 static inline void 1221 xfs_log_item_batch_insert( 1222 struct xfs_ail *ailp, 1223 struct xfs_ail_cursor *cur, 1224 struct xfs_log_item **log_items, 1225 int nr_items, 1226 xfs_lsn_t commit_lsn) 1227 { 1228 int i; 1229 1230 spin_lock(&ailp->xa_lock); 1231 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */ 1232 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn); 1233 1234 for (i = 0; i < nr_items; i++) 1235 IOP_UNPIN(log_items[i], 0); 1236 } 1237 1238 /* 1239 * Bulk operation version of xfs_trans_committed that takes a log vector of 1240 * items to insert into the AIL. This uses bulk AIL insertion techniques to 1241 * minimise lock traffic. 1242 * 1243 * If we are called with the aborted flag set, it is because a log write during 1244 * a CIL checkpoint commit has failed. In this case, all the items in the 1245 * checkpoint have already gone through IOP_COMMITED and IOP_UNLOCK, which 1246 * means that checkpoint commit abort handling is treated exactly the same 1247 * as an iclog write error even though we haven't started any IO yet. Hence in 1248 * this case all we need to do is IOP_COMMITTED processing, followed by an 1249 * IOP_UNPIN(aborted) call. 1250 * 1251 * The AIL cursor is used to optimise the insert process. If commit_lsn is not 1252 * at the end of the AIL, the insert cursor avoids the need to walk 1253 * the AIL to find the insertion point on every xfs_log_item_batch_insert() 1254 * call. This saves a lot of needless list walking and is a net win, even 1255 * though it slightly increases that amount of AIL lock traffic to set it up 1256 * and tear it down. 1257 */ 1258 void 1259 xfs_trans_committed_bulk( 1260 struct xfs_ail *ailp, 1261 struct xfs_log_vec *log_vector, 1262 xfs_lsn_t commit_lsn, 1263 int aborted) 1264 { 1265 #define LOG_ITEM_BATCH_SIZE 32 1266 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE]; 1267 struct xfs_log_vec *lv; 1268 struct xfs_ail_cursor cur; 1269 int i = 0; 1270 1271 spin_lock(&ailp->xa_lock); 1272 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn); 1273 spin_unlock(&ailp->xa_lock); 1274 1275 /* unpin all the log items */ 1276 for (lv = log_vector; lv; lv = lv->lv_next ) { 1277 struct xfs_log_item *lip = lv->lv_item; 1278 xfs_lsn_t item_lsn; 1279 1280 if (aborted) 1281 lip->li_flags |= XFS_LI_ABORTED; 1282 item_lsn = IOP_COMMITTED(lip, commit_lsn); 1283 1284 /* item_lsn of -1 means the item needs no further processing */ 1285 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) 1286 continue; 1287 1288 /* 1289 * if we are aborting the operation, no point in inserting the 1290 * object into the AIL as we are in a shutdown situation. 1291 */ 1292 if (aborted) { 1293 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount)); 1294 IOP_UNPIN(lip, 1); 1295 continue; 1296 } 1297 1298 if (item_lsn != commit_lsn) { 1299 1300 /* 1301 * Not a bulk update option due to unusual item_lsn. 1302 * Push into AIL immediately, rechecking the lsn once 1303 * we have the ail lock. Then unpin the item. This does 1304 * not affect the AIL cursor the bulk insert path is 1305 * using. 1306 */ 1307 spin_lock(&ailp->xa_lock); 1308 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) 1309 xfs_trans_ail_update(ailp, lip, item_lsn); 1310 else 1311 spin_unlock(&ailp->xa_lock); 1312 IOP_UNPIN(lip, 0); 1313 continue; 1314 } 1315 1316 /* Item is a candidate for bulk AIL insert. */ 1317 log_items[i++] = lv->lv_item; 1318 if (i >= LOG_ITEM_BATCH_SIZE) { 1319 xfs_log_item_batch_insert(ailp, &cur, log_items, 1320 LOG_ITEM_BATCH_SIZE, commit_lsn); 1321 i = 0; 1322 } 1323 } 1324 1325 /* make sure we insert the remainder! */ 1326 if (i) 1327 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn); 1328 1329 spin_lock(&ailp->xa_lock); 1330 xfs_trans_ail_cursor_done(ailp, &cur); 1331 spin_unlock(&ailp->xa_lock); 1332 } 1333 1334 /* 1335 * Commit the given transaction to the log. 1336 * 1337 * XFS disk error handling mechanism is not based on a typical 1338 * transaction abort mechanism. Logically after the filesystem 1339 * gets marked 'SHUTDOWN', we can't let any new transactions 1340 * be durable - ie. committed to disk - because some metadata might 1341 * be inconsistent. In such cases, this returns an error, and the 1342 * caller may assume that all locked objects joined to the transaction 1343 * have already been unlocked as if the commit had succeeded. 1344 * Do not reference the transaction structure after this call. 1345 */ 1346 int 1347 xfs_trans_commit( 1348 struct xfs_trans *tp, 1349 uint flags) 1350 { 1351 struct xfs_mount *mp = tp->t_mountp; 1352 xfs_lsn_t commit_lsn = -1; 1353 int error = 0; 1354 int log_flags = 0; 1355 int sync = tp->t_flags & XFS_TRANS_SYNC; 1356 1357 /* 1358 * Determine whether this commit is releasing a permanent 1359 * log reservation or not. 1360 */ 1361 if (flags & XFS_TRANS_RELEASE_LOG_RES) { 1362 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); 1363 log_flags = XFS_LOG_REL_PERM_RESERV; 1364 } 1365 1366 /* 1367 * If there is nothing to be logged by the transaction, 1368 * then unlock all of the items associated with the 1369 * transaction and free the transaction structure. 1370 * Also make sure to return any reserved blocks to 1371 * the free pool. 1372 */ 1373 if (!(tp->t_flags & XFS_TRANS_DIRTY)) 1374 goto out_unreserve; 1375 1376 if (XFS_FORCED_SHUTDOWN(mp)) { 1377 error = XFS_ERROR(EIO); 1378 goto out_unreserve; 1379 } 1380 1381 ASSERT(tp->t_ticket != NULL); 1382 1383 /* 1384 * If we need to update the superblock, then do it now. 1385 */ 1386 if (tp->t_flags & XFS_TRANS_SB_DIRTY) 1387 xfs_trans_apply_sb_deltas(tp); 1388 xfs_trans_apply_dquot_deltas(tp); 1389 1390 error = xfs_log_commit_cil(mp, tp, &commit_lsn, flags); 1391 if (error == ENOMEM) { 1392 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 1393 error = XFS_ERROR(EIO); 1394 goto out_unreserve; 1395 } 1396 1397 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); 1398 xfs_trans_free(tp); 1399 1400 /* 1401 * If the transaction needs to be synchronous, then force the 1402 * log out now and wait for it. 1403 */ 1404 if (sync) { 1405 if (!error) { 1406 error = _xfs_log_force_lsn(mp, commit_lsn, 1407 XFS_LOG_SYNC, NULL); 1408 } 1409 XFS_STATS_INC(xs_trans_sync); 1410 } else { 1411 XFS_STATS_INC(xs_trans_async); 1412 } 1413 1414 return error; 1415 1416 out_unreserve: 1417 xfs_trans_unreserve_and_mod_sb(tp); 1418 1419 /* 1420 * It is indeed possible for the transaction to be not dirty but 1421 * the dqinfo portion to be. All that means is that we have some 1422 * (non-persistent) quota reservations that need to be unreserved. 1423 */ 1424 xfs_trans_unreserve_and_mod_dquots(tp); 1425 if (tp->t_ticket) { 1426 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags); 1427 if (commit_lsn == -1 && !error) 1428 error = XFS_ERROR(EIO); 1429 } 1430 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); 1431 xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0); 1432 xfs_trans_free(tp); 1433 1434 XFS_STATS_INC(xs_trans_empty); 1435 return error; 1436 } 1437 1438 /* 1439 * Unlock all of the transaction's items and free the transaction. 1440 * The transaction must not have modified any of its items, because 1441 * there is no way to restore them to their previous state. 1442 * 1443 * If the transaction has made a log reservation, make sure to release 1444 * it as well. 1445 */ 1446 void 1447 xfs_trans_cancel( 1448 xfs_trans_t *tp, 1449 int flags) 1450 { 1451 int log_flags; 1452 xfs_mount_t *mp = tp->t_mountp; 1453 1454 /* 1455 * See if the caller is being too lazy to figure out if 1456 * the transaction really needs an abort. 1457 */ 1458 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY)) 1459 flags &= ~XFS_TRANS_ABORT; 1460 /* 1461 * See if the caller is relying on us to shut down the 1462 * filesystem. This happens in paths where we detect 1463 * corruption and decide to give up. 1464 */ 1465 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) { 1466 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp); 1467 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1468 } 1469 #ifdef DEBUG 1470 if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) { 1471 struct xfs_log_item_desc *lidp; 1472 1473 list_for_each_entry(lidp, &tp->t_items, lid_trans) 1474 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD)); 1475 } 1476 #endif 1477 xfs_trans_unreserve_and_mod_sb(tp); 1478 xfs_trans_unreserve_and_mod_dquots(tp); 1479 1480 if (tp->t_ticket) { 1481 if (flags & XFS_TRANS_RELEASE_LOG_RES) { 1482 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); 1483 log_flags = XFS_LOG_REL_PERM_RESERV; 1484 } else { 1485 log_flags = 0; 1486 } 1487 xfs_log_done(mp, tp->t_ticket, NULL, log_flags); 1488 } 1489 1490 /* mark this thread as no longer being in a transaction */ 1491 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); 1492 1493 xfs_trans_free_items(tp, NULLCOMMITLSN, flags); 1494 xfs_trans_free(tp); 1495 } 1496 1497 /* 1498 * Roll from one trans in the sequence of PERMANENT transactions to 1499 * the next: permanent transactions are only flushed out when 1500 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon 1501 * as possible to let chunks of it go to the log. So we commit the 1502 * chunk we've been working on and get a new transaction to continue. 1503 */ 1504 int 1505 xfs_trans_roll( 1506 struct xfs_trans **tpp, 1507 struct xfs_inode *dp) 1508 { 1509 struct xfs_trans *trans; 1510 unsigned int logres, count; 1511 int error; 1512 1513 /* 1514 * Ensure that the inode is always logged. 1515 */ 1516 trans = *tpp; 1517 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE); 1518 1519 /* 1520 * Copy the critical parameters from one trans to the next. 1521 */ 1522 logres = trans->t_log_res; 1523 count = trans->t_log_count; 1524 *tpp = xfs_trans_dup(trans); 1525 1526 /* 1527 * Commit the current transaction. 1528 * If this commit failed, then it'd just unlock those items that 1529 * are not marked ihold. That also means that a filesystem shutdown 1530 * is in progress. The caller takes the responsibility to cancel 1531 * the duplicate transaction that gets returned. 1532 */ 1533 error = xfs_trans_commit(trans, 0); 1534 if (error) 1535 return (error); 1536 1537 trans = *tpp; 1538 1539 /* 1540 * transaction commit worked ok so we can drop the extra ticket 1541 * reference that we gained in xfs_trans_dup() 1542 */ 1543 xfs_log_ticket_put(trans->t_ticket); 1544 1545 1546 /* 1547 * Reserve space in the log for th next transaction. 1548 * This also pushes items in the "AIL", the list of logged items, 1549 * out to disk if they are taking up space at the tail of the log 1550 * that we want to use. This requires that either nothing be locked 1551 * across this call, or that anything that is locked be logged in 1552 * the prior and the next transactions. 1553 */ 1554 error = xfs_trans_reserve(trans, 0, logres, 0, 1555 XFS_TRANS_PERM_LOG_RES, count); 1556 /* 1557 * Ensure that the inode is in the new transaction and locked. 1558 */ 1559 if (error) 1560 return error; 1561 1562 xfs_trans_ijoin(trans, dp, 0); 1563 return 0; 1564 } 1565