1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * Copyright (c) 2018 Red Hat, Inc. 5 * All rights reserved. 6 */ 7 8 #include "xfs.h" 9 #include "xfs_fs.h" 10 #include "xfs_shared.h" 11 #include "xfs_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_bit.h" 14 #include "xfs_sb.h" 15 #include "xfs_mount.h" 16 #include "xfs_btree.h" 17 #include "xfs_alloc_btree.h" 18 #include "xfs_rmap_btree.h" 19 #include "xfs_alloc.h" 20 #include "xfs_ialloc.h" 21 #include "xfs_rmap.h" 22 #include "xfs_ag.h" 23 #include "xfs_ag_resv.h" 24 #include "xfs_health.h" 25 #include "xfs_error.h" 26 #include "xfs_bmap.h" 27 #include "xfs_defer.h" 28 #include "xfs_log_format.h" 29 #include "xfs_trans.h" 30 #include "xfs_trace.h" 31 #include "xfs_inode.h" 32 #include "xfs_icache.h" 33 34 35 /* 36 * Passive reference counting access wrappers to the perag structures. If the 37 * per-ag structure is to be freed, the freeing code is responsible for cleaning 38 * up objects with passive references before freeing the structure. This is 39 * things like cached buffers. 40 */ 41 struct xfs_perag * 42 xfs_perag_get( 43 struct xfs_mount *mp, 44 xfs_agnumber_t agno) 45 { 46 struct xfs_perag *pag; 47 48 rcu_read_lock(); 49 pag = radix_tree_lookup(&mp->m_perag_tree, agno); 50 if (pag) { 51 trace_xfs_perag_get(pag, _RET_IP_); 52 ASSERT(atomic_read(&pag->pag_ref) >= 0); 53 atomic_inc(&pag->pag_ref); 54 } 55 rcu_read_unlock(); 56 return pag; 57 } 58 59 /* 60 * search from @first to find the next perag with the given tag set. 61 */ 62 struct xfs_perag * 63 xfs_perag_get_tag( 64 struct xfs_mount *mp, 65 xfs_agnumber_t first, 66 unsigned int tag) 67 { 68 struct xfs_perag *pag; 69 int found; 70 71 rcu_read_lock(); 72 found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, 73 (void **)&pag, first, 1, tag); 74 if (found <= 0) { 75 rcu_read_unlock(); 76 return NULL; 77 } 78 trace_xfs_perag_get_tag(pag, _RET_IP_); 79 atomic_inc(&pag->pag_ref); 80 rcu_read_unlock(); 81 return pag; 82 } 83 84 /* Get a passive reference to the given perag. */ 85 struct xfs_perag * 86 xfs_perag_hold( 87 struct xfs_perag *pag) 88 { 89 ASSERT(atomic_read(&pag->pag_ref) > 0 || 90 atomic_read(&pag->pag_active_ref) > 0); 91 92 trace_xfs_perag_hold(pag, _RET_IP_); 93 atomic_inc(&pag->pag_ref); 94 return pag; 95 } 96 97 void 98 xfs_perag_put( 99 struct xfs_perag *pag) 100 { 101 trace_xfs_perag_put(pag, _RET_IP_); 102 ASSERT(atomic_read(&pag->pag_ref) > 0); 103 atomic_dec(&pag->pag_ref); 104 } 105 106 /* 107 * Active references for perag structures. This is for short term access to the 108 * per ag structures for walking trees or accessing state. If an AG is being 109 * shrunk or is offline, then this will fail to find that AG and return NULL 110 * instead. 111 */ 112 struct xfs_perag * 113 xfs_perag_grab( 114 struct xfs_mount *mp, 115 xfs_agnumber_t agno) 116 { 117 struct xfs_perag *pag; 118 119 rcu_read_lock(); 120 pag = radix_tree_lookup(&mp->m_perag_tree, agno); 121 if (pag) { 122 trace_xfs_perag_grab(pag, _RET_IP_); 123 if (!atomic_inc_not_zero(&pag->pag_active_ref)) 124 pag = NULL; 125 } 126 rcu_read_unlock(); 127 return pag; 128 } 129 130 /* 131 * search from @first to find the next perag with the given tag set. 132 */ 133 struct xfs_perag * 134 xfs_perag_grab_tag( 135 struct xfs_mount *mp, 136 xfs_agnumber_t first, 137 int tag) 138 { 139 struct xfs_perag *pag; 140 int found; 141 142 rcu_read_lock(); 143 found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, 144 (void **)&pag, first, 1, tag); 145 if (found <= 0) { 146 rcu_read_unlock(); 147 return NULL; 148 } 149 trace_xfs_perag_grab_tag(pag, _RET_IP_); 150 if (!atomic_inc_not_zero(&pag->pag_active_ref)) 151 pag = NULL; 152 rcu_read_unlock(); 153 return pag; 154 } 155 156 void 157 xfs_perag_rele( 158 struct xfs_perag *pag) 159 { 160 trace_xfs_perag_rele(pag, _RET_IP_); 161 if (atomic_dec_and_test(&pag->pag_active_ref)) 162 wake_up(&pag->pag_active_wq); 163 } 164 165 /* 166 * xfs_initialize_perag_data 167 * 168 * Read in each per-ag structure so we can count up the number of 169 * allocated inodes, free inodes and used filesystem blocks as this 170 * information is no longer persistent in the superblock. Once we have 171 * this information, write it into the in-core superblock structure. 172 */ 173 int 174 xfs_initialize_perag_data( 175 struct xfs_mount *mp, 176 xfs_agnumber_t agcount) 177 { 178 xfs_agnumber_t index; 179 struct xfs_perag *pag; 180 struct xfs_sb *sbp = &mp->m_sb; 181 uint64_t ifree = 0; 182 uint64_t ialloc = 0; 183 uint64_t bfree = 0; 184 uint64_t bfreelst = 0; 185 uint64_t btree = 0; 186 uint64_t fdblocks; 187 int error = 0; 188 189 for (index = 0; index < agcount; index++) { 190 /* 191 * Read the AGF and AGI buffers to populate the per-ag 192 * structures for us. 193 */ 194 pag = xfs_perag_get(mp, index); 195 error = xfs_alloc_read_agf(pag, NULL, 0, NULL); 196 if (!error) 197 error = xfs_ialloc_read_agi(pag, NULL, NULL); 198 if (error) { 199 xfs_perag_put(pag); 200 return error; 201 } 202 203 ifree += pag->pagi_freecount; 204 ialloc += pag->pagi_count; 205 bfree += pag->pagf_freeblks; 206 bfreelst += pag->pagf_flcount; 207 btree += pag->pagf_btreeblks; 208 xfs_perag_put(pag); 209 } 210 fdblocks = bfree + bfreelst + btree; 211 212 /* 213 * If the new summary counts are obviously incorrect, fail the 214 * mount operation because that implies the AGFs are also corrupt. 215 * Clear FS_COUNTERS so that we don't unmount with a dirty log, which 216 * will prevent xfs_repair from fixing anything. 217 */ 218 if (fdblocks > sbp->sb_dblocks || ifree > ialloc) { 219 xfs_alert(mp, "AGF corruption. Please run xfs_repair."); 220 error = -EFSCORRUPTED; 221 goto out; 222 } 223 224 /* Overwrite incore superblock counters with just-read data */ 225 spin_lock(&mp->m_sb_lock); 226 sbp->sb_ifree = ifree; 227 sbp->sb_icount = ialloc; 228 sbp->sb_fdblocks = fdblocks; 229 spin_unlock(&mp->m_sb_lock); 230 231 xfs_reinit_percpu_counters(mp); 232 out: 233 xfs_fs_mark_healthy(mp, XFS_SICK_FS_COUNTERS); 234 return error; 235 } 236 237 STATIC void 238 __xfs_free_perag( 239 struct rcu_head *head) 240 { 241 struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); 242 243 ASSERT(!delayed_work_pending(&pag->pag_blockgc_work)); 244 kmem_free(pag); 245 } 246 247 /* 248 * Free up the per-ag resources associated with the mount structure. 249 */ 250 void 251 xfs_free_perag( 252 struct xfs_mount *mp) 253 { 254 struct xfs_perag *pag; 255 xfs_agnumber_t agno; 256 257 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { 258 spin_lock(&mp->m_perag_lock); 259 pag = radix_tree_delete(&mp->m_perag_tree, agno); 260 spin_unlock(&mp->m_perag_lock); 261 ASSERT(pag); 262 XFS_IS_CORRUPT(pag->pag_mount, atomic_read(&pag->pag_ref) != 0); 263 xfs_defer_drain_free(&pag->pag_intents_drain); 264 265 cancel_delayed_work_sync(&pag->pag_blockgc_work); 266 xfs_buf_hash_destroy(pag); 267 268 /* drop the mount's active reference */ 269 xfs_perag_rele(pag); 270 XFS_IS_CORRUPT(pag->pag_mount, 271 atomic_read(&pag->pag_active_ref) != 0); 272 call_rcu(&pag->rcu_head, __xfs_free_perag); 273 } 274 } 275 276 /* Find the size of the AG, in blocks. */ 277 static xfs_agblock_t 278 __xfs_ag_block_count( 279 struct xfs_mount *mp, 280 xfs_agnumber_t agno, 281 xfs_agnumber_t agcount, 282 xfs_rfsblock_t dblocks) 283 { 284 ASSERT(agno < agcount); 285 286 if (agno < agcount - 1) 287 return mp->m_sb.sb_agblocks; 288 return dblocks - (agno * mp->m_sb.sb_agblocks); 289 } 290 291 xfs_agblock_t 292 xfs_ag_block_count( 293 struct xfs_mount *mp, 294 xfs_agnumber_t agno) 295 { 296 return __xfs_ag_block_count(mp, agno, mp->m_sb.sb_agcount, 297 mp->m_sb.sb_dblocks); 298 } 299 300 /* Calculate the first and last possible inode number in an AG. */ 301 static void 302 __xfs_agino_range( 303 struct xfs_mount *mp, 304 xfs_agblock_t eoag, 305 xfs_agino_t *first, 306 xfs_agino_t *last) 307 { 308 xfs_agblock_t bno; 309 310 /* 311 * Calculate the first inode, which will be in the first 312 * cluster-aligned block after the AGFL. 313 */ 314 bno = round_up(XFS_AGFL_BLOCK(mp) + 1, M_IGEO(mp)->cluster_align); 315 *first = XFS_AGB_TO_AGINO(mp, bno); 316 317 /* 318 * Calculate the last inode, which will be at the end of the 319 * last (aligned) cluster that can be allocated in the AG. 320 */ 321 bno = round_down(eoag, M_IGEO(mp)->cluster_align); 322 *last = XFS_AGB_TO_AGINO(mp, bno) - 1; 323 } 324 325 void 326 xfs_agino_range( 327 struct xfs_mount *mp, 328 xfs_agnumber_t agno, 329 xfs_agino_t *first, 330 xfs_agino_t *last) 331 { 332 return __xfs_agino_range(mp, xfs_ag_block_count(mp, agno), first, last); 333 } 334 335 int 336 xfs_initialize_perag( 337 struct xfs_mount *mp, 338 xfs_agnumber_t agcount, 339 xfs_rfsblock_t dblocks, 340 xfs_agnumber_t *maxagi) 341 { 342 struct xfs_perag *pag; 343 xfs_agnumber_t index; 344 xfs_agnumber_t first_initialised = NULLAGNUMBER; 345 int error; 346 347 /* 348 * Walk the current per-ag tree so we don't try to initialise AGs 349 * that already exist (growfs case). Allocate and insert all the 350 * AGs we don't find ready for initialisation. 351 */ 352 for (index = 0; index < agcount; index++) { 353 pag = xfs_perag_get(mp, index); 354 if (pag) { 355 xfs_perag_put(pag); 356 continue; 357 } 358 359 pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); 360 if (!pag) { 361 error = -ENOMEM; 362 goto out_unwind_new_pags; 363 } 364 pag->pag_agno = index; 365 pag->pag_mount = mp; 366 367 error = radix_tree_preload(GFP_NOFS); 368 if (error) 369 goto out_free_pag; 370 371 spin_lock(&mp->m_perag_lock); 372 if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { 373 WARN_ON_ONCE(1); 374 spin_unlock(&mp->m_perag_lock); 375 radix_tree_preload_end(); 376 error = -EEXIST; 377 goto out_free_pag; 378 } 379 spin_unlock(&mp->m_perag_lock); 380 radix_tree_preload_end(); 381 382 #ifdef __KERNEL__ 383 /* Place kernel structure only init below this point. */ 384 spin_lock_init(&pag->pag_ici_lock); 385 spin_lock_init(&pag->pagb_lock); 386 spin_lock_init(&pag->pag_state_lock); 387 INIT_DELAYED_WORK(&pag->pag_blockgc_work, xfs_blockgc_worker); 388 INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); 389 xfs_defer_drain_init(&pag->pag_intents_drain); 390 init_waitqueue_head(&pag->pagb_wait); 391 init_waitqueue_head(&pag->pag_active_wq); 392 pag->pagb_count = 0; 393 pag->pagb_tree = RB_ROOT; 394 #endif /* __KERNEL__ */ 395 396 error = xfs_buf_hash_init(pag); 397 if (error) 398 goto out_remove_pag; 399 400 /* Active ref owned by mount indicates AG is online. */ 401 atomic_set(&pag->pag_active_ref, 1); 402 403 /* first new pag is fully initialized */ 404 if (first_initialised == NULLAGNUMBER) 405 first_initialised = index; 406 407 /* 408 * Pre-calculated geometry 409 */ 410 pag->block_count = __xfs_ag_block_count(mp, index, agcount, 411 dblocks); 412 pag->min_block = XFS_AGFL_BLOCK(mp); 413 __xfs_agino_range(mp, pag->block_count, &pag->agino_min, 414 &pag->agino_max); 415 } 416 417 index = xfs_set_inode_alloc(mp, agcount); 418 419 if (maxagi) 420 *maxagi = index; 421 422 mp->m_ag_prealloc_blocks = xfs_prealloc_blocks(mp); 423 return 0; 424 425 out_remove_pag: 426 xfs_defer_drain_free(&pag->pag_intents_drain); 427 radix_tree_delete(&mp->m_perag_tree, index); 428 out_free_pag: 429 kmem_free(pag); 430 out_unwind_new_pags: 431 /* unwind any prior newly initialized pags */ 432 for (index = first_initialised; index < agcount; index++) { 433 pag = radix_tree_delete(&mp->m_perag_tree, index); 434 if (!pag) 435 break; 436 xfs_buf_hash_destroy(pag); 437 xfs_defer_drain_free(&pag->pag_intents_drain); 438 kmem_free(pag); 439 } 440 return error; 441 } 442 443 static int 444 xfs_get_aghdr_buf( 445 struct xfs_mount *mp, 446 xfs_daddr_t blkno, 447 size_t numblks, 448 struct xfs_buf **bpp, 449 const struct xfs_buf_ops *ops) 450 { 451 struct xfs_buf *bp; 452 int error; 453 454 error = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, 0, &bp); 455 if (error) 456 return error; 457 458 bp->b_maps[0].bm_bn = blkno; 459 bp->b_ops = ops; 460 461 *bpp = bp; 462 return 0; 463 } 464 465 /* 466 * Generic btree root block init function 467 */ 468 static void 469 xfs_btroot_init( 470 struct xfs_mount *mp, 471 struct xfs_buf *bp, 472 struct aghdr_init_data *id) 473 { 474 xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno); 475 } 476 477 /* Finish initializing a free space btree. */ 478 static void 479 xfs_freesp_init_recs( 480 struct xfs_mount *mp, 481 struct xfs_buf *bp, 482 struct aghdr_init_data *id) 483 { 484 struct xfs_alloc_rec *arec; 485 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 486 487 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 488 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks); 489 490 if (xfs_ag_contains_log(mp, id->agno)) { 491 struct xfs_alloc_rec *nrec; 492 xfs_agblock_t start = XFS_FSB_TO_AGBNO(mp, 493 mp->m_sb.sb_logstart); 494 495 ASSERT(start >= mp->m_ag_prealloc_blocks); 496 if (start != mp->m_ag_prealloc_blocks) { 497 /* 498 * Modify first record to pad stripe align of log and 499 * bump the record count. 500 */ 501 arec->ar_blockcount = cpu_to_be32(start - 502 mp->m_ag_prealloc_blocks); 503 be16_add_cpu(&block->bb_numrecs, 1); 504 nrec = arec + 1; 505 506 /* 507 * Insert second record at start of internal log 508 * which then gets trimmed. 509 */ 510 nrec->ar_startblock = cpu_to_be32( 511 be32_to_cpu(arec->ar_startblock) + 512 be32_to_cpu(arec->ar_blockcount)); 513 arec = nrec; 514 } 515 /* 516 * Change record start to after the internal log 517 */ 518 be32_add_cpu(&arec->ar_startblock, mp->m_sb.sb_logblocks); 519 } 520 521 /* 522 * Calculate the block count of this record; if it is nonzero, 523 * increment the record count. 524 */ 525 arec->ar_blockcount = cpu_to_be32(id->agsize - 526 be32_to_cpu(arec->ar_startblock)); 527 if (arec->ar_blockcount) 528 be16_add_cpu(&block->bb_numrecs, 1); 529 } 530 531 /* 532 * Alloc btree root block init functions 533 */ 534 static void 535 xfs_bnoroot_init( 536 struct xfs_mount *mp, 537 struct xfs_buf *bp, 538 struct aghdr_init_data *id) 539 { 540 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 0, id->agno); 541 xfs_freesp_init_recs(mp, bp, id); 542 } 543 544 static void 545 xfs_cntroot_init( 546 struct xfs_mount *mp, 547 struct xfs_buf *bp, 548 struct aghdr_init_data *id) 549 { 550 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 0, id->agno); 551 xfs_freesp_init_recs(mp, bp, id); 552 } 553 554 /* 555 * Reverse map root block init 556 */ 557 static void 558 xfs_rmaproot_init( 559 struct xfs_mount *mp, 560 struct xfs_buf *bp, 561 struct aghdr_init_data *id) 562 { 563 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 564 struct xfs_rmap_rec *rrec; 565 566 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno); 567 568 /* 569 * mark the AG header regions as static metadata The BNO 570 * btree block is the first block after the headers, so 571 * it's location defines the size of region the static 572 * metadata consumes. 573 * 574 * Note: unlike mkfs, we never have to account for log 575 * space when growing the data regions 576 */ 577 rrec = XFS_RMAP_REC_ADDR(block, 1); 578 rrec->rm_startblock = 0; 579 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp)); 580 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS); 581 rrec->rm_offset = 0; 582 583 /* account freespace btree root blocks */ 584 rrec = XFS_RMAP_REC_ADDR(block, 2); 585 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp)); 586 rrec->rm_blockcount = cpu_to_be32(2); 587 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 588 rrec->rm_offset = 0; 589 590 /* account inode btree root blocks */ 591 rrec = XFS_RMAP_REC_ADDR(block, 3); 592 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp)); 593 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) - 594 XFS_IBT_BLOCK(mp)); 595 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT); 596 rrec->rm_offset = 0; 597 598 /* account for rmap btree root */ 599 rrec = XFS_RMAP_REC_ADDR(block, 4); 600 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp)); 601 rrec->rm_blockcount = cpu_to_be32(1); 602 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 603 rrec->rm_offset = 0; 604 605 /* account for refc btree root */ 606 if (xfs_has_reflink(mp)) { 607 rrec = XFS_RMAP_REC_ADDR(block, 5); 608 rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp)); 609 rrec->rm_blockcount = cpu_to_be32(1); 610 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC); 611 rrec->rm_offset = 0; 612 be16_add_cpu(&block->bb_numrecs, 1); 613 } 614 615 /* account for the log space */ 616 if (xfs_ag_contains_log(mp, id->agno)) { 617 rrec = XFS_RMAP_REC_ADDR(block, 618 be16_to_cpu(block->bb_numrecs) + 1); 619 rrec->rm_startblock = cpu_to_be32( 620 XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart)); 621 rrec->rm_blockcount = cpu_to_be32(mp->m_sb.sb_logblocks); 622 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_LOG); 623 rrec->rm_offset = 0; 624 be16_add_cpu(&block->bb_numrecs, 1); 625 } 626 } 627 628 /* 629 * Initialise new secondary superblocks with the pre-grow geometry, but mark 630 * them as "in progress" so we know they haven't yet been activated. This will 631 * get cleared when the update with the new geometry information is done after 632 * changes to the primary are committed. This isn't strictly necessary, but we 633 * get it for free with the delayed buffer write lists and it means we can tell 634 * if a grow operation didn't complete properly after the fact. 635 */ 636 static void 637 xfs_sbblock_init( 638 struct xfs_mount *mp, 639 struct xfs_buf *bp, 640 struct aghdr_init_data *id) 641 { 642 struct xfs_dsb *dsb = bp->b_addr; 643 644 xfs_sb_to_disk(dsb, &mp->m_sb); 645 dsb->sb_inprogress = 1; 646 } 647 648 static void 649 xfs_agfblock_init( 650 struct xfs_mount *mp, 651 struct xfs_buf *bp, 652 struct aghdr_init_data *id) 653 { 654 struct xfs_agf *agf = bp->b_addr; 655 xfs_extlen_t tmpsize; 656 657 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 658 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 659 agf->agf_seqno = cpu_to_be32(id->agno); 660 agf->agf_length = cpu_to_be32(id->agsize); 661 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 662 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 663 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 664 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 665 if (xfs_has_rmapbt(mp)) { 666 agf->agf_roots[XFS_BTNUM_RMAPi] = 667 cpu_to_be32(XFS_RMAP_BLOCK(mp)); 668 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1); 669 agf->agf_rmap_blocks = cpu_to_be32(1); 670 } 671 672 agf->agf_flfirst = cpu_to_be32(1); 673 agf->agf_fllast = 0; 674 agf->agf_flcount = 0; 675 tmpsize = id->agsize - mp->m_ag_prealloc_blocks; 676 agf->agf_freeblks = cpu_to_be32(tmpsize); 677 agf->agf_longest = cpu_to_be32(tmpsize); 678 if (xfs_has_crc(mp)) 679 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); 680 if (xfs_has_reflink(mp)) { 681 agf->agf_refcount_root = cpu_to_be32( 682 xfs_refc_block(mp)); 683 agf->agf_refcount_level = cpu_to_be32(1); 684 agf->agf_refcount_blocks = cpu_to_be32(1); 685 } 686 687 if (xfs_ag_contains_log(mp, id->agno)) { 688 int64_t logblocks = mp->m_sb.sb_logblocks; 689 690 be32_add_cpu(&agf->agf_freeblks, -logblocks); 691 agf->agf_longest = cpu_to_be32(id->agsize - 692 XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart) - logblocks); 693 } 694 } 695 696 static void 697 xfs_agflblock_init( 698 struct xfs_mount *mp, 699 struct xfs_buf *bp, 700 struct aghdr_init_data *id) 701 { 702 struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); 703 __be32 *agfl_bno; 704 int bucket; 705 706 if (xfs_has_crc(mp)) { 707 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 708 agfl->agfl_seqno = cpu_to_be32(id->agno); 709 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); 710 } 711 712 agfl_bno = xfs_buf_to_agfl_bno(bp); 713 for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++) 714 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 715 } 716 717 static void 718 xfs_agiblock_init( 719 struct xfs_mount *mp, 720 struct xfs_buf *bp, 721 struct aghdr_init_data *id) 722 { 723 struct xfs_agi *agi = bp->b_addr; 724 int bucket; 725 726 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 727 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 728 agi->agi_seqno = cpu_to_be32(id->agno); 729 agi->agi_length = cpu_to_be32(id->agsize); 730 agi->agi_count = 0; 731 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 732 agi->agi_level = cpu_to_be32(1); 733 agi->agi_freecount = 0; 734 agi->agi_newino = cpu_to_be32(NULLAGINO); 735 agi->agi_dirino = cpu_to_be32(NULLAGINO); 736 if (xfs_has_crc(mp)) 737 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); 738 if (xfs_has_finobt(mp)) { 739 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 740 agi->agi_free_level = cpu_to_be32(1); 741 } 742 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 743 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 744 if (xfs_has_inobtcounts(mp)) { 745 agi->agi_iblocks = cpu_to_be32(1); 746 if (xfs_has_finobt(mp)) 747 agi->agi_fblocks = cpu_to_be32(1); 748 } 749 } 750 751 typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp, 752 struct aghdr_init_data *id); 753 static int 754 xfs_ag_init_hdr( 755 struct xfs_mount *mp, 756 struct aghdr_init_data *id, 757 aghdr_init_work_f work, 758 const struct xfs_buf_ops *ops) 759 { 760 struct xfs_buf *bp; 761 int error; 762 763 error = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, &bp, ops); 764 if (error) 765 return error; 766 767 (*work)(mp, bp, id); 768 769 xfs_buf_delwri_queue(bp, &id->buffer_list); 770 xfs_buf_relse(bp); 771 return 0; 772 } 773 774 struct xfs_aghdr_grow_data { 775 xfs_daddr_t daddr; 776 size_t numblks; 777 const struct xfs_buf_ops *ops; 778 aghdr_init_work_f work; 779 xfs_btnum_t type; 780 bool need_init; 781 }; 782 783 /* 784 * Prepare new AG headers to be written to disk. We use uncached buffers here, 785 * as it is assumed these new AG headers are currently beyond the currently 786 * valid filesystem address space. Using cached buffers would trip over EOFS 787 * corruption detection alogrithms in the buffer cache lookup routines. 788 * 789 * This is a non-transactional function, but the prepared buffers are added to a 790 * delayed write buffer list supplied by the caller so they can submit them to 791 * disk and wait on them as required. 792 */ 793 int 794 xfs_ag_init_headers( 795 struct xfs_mount *mp, 796 struct aghdr_init_data *id) 797 798 { 799 struct xfs_aghdr_grow_data aghdr_data[] = { 800 { /* SB */ 801 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR), 802 .numblks = XFS_FSS_TO_BB(mp, 1), 803 .ops = &xfs_sb_buf_ops, 804 .work = &xfs_sbblock_init, 805 .need_init = true 806 }, 807 { /* AGF */ 808 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)), 809 .numblks = XFS_FSS_TO_BB(mp, 1), 810 .ops = &xfs_agf_buf_ops, 811 .work = &xfs_agfblock_init, 812 .need_init = true 813 }, 814 { /* AGFL */ 815 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)), 816 .numblks = XFS_FSS_TO_BB(mp, 1), 817 .ops = &xfs_agfl_buf_ops, 818 .work = &xfs_agflblock_init, 819 .need_init = true 820 }, 821 { /* AGI */ 822 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)), 823 .numblks = XFS_FSS_TO_BB(mp, 1), 824 .ops = &xfs_agi_buf_ops, 825 .work = &xfs_agiblock_init, 826 .need_init = true 827 }, 828 { /* BNO root block */ 829 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)), 830 .numblks = BTOBB(mp->m_sb.sb_blocksize), 831 .ops = &xfs_bnobt_buf_ops, 832 .work = &xfs_bnoroot_init, 833 .need_init = true 834 }, 835 { /* CNT root block */ 836 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)), 837 .numblks = BTOBB(mp->m_sb.sb_blocksize), 838 .ops = &xfs_cntbt_buf_ops, 839 .work = &xfs_cntroot_init, 840 .need_init = true 841 }, 842 { /* INO root block */ 843 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)), 844 .numblks = BTOBB(mp->m_sb.sb_blocksize), 845 .ops = &xfs_inobt_buf_ops, 846 .work = &xfs_btroot_init, 847 .type = XFS_BTNUM_INO, 848 .need_init = true 849 }, 850 { /* FINO root block */ 851 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)), 852 .numblks = BTOBB(mp->m_sb.sb_blocksize), 853 .ops = &xfs_finobt_buf_ops, 854 .work = &xfs_btroot_init, 855 .type = XFS_BTNUM_FINO, 856 .need_init = xfs_has_finobt(mp) 857 }, 858 { /* RMAP root block */ 859 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)), 860 .numblks = BTOBB(mp->m_sb.sb_blocksize), 861 .ops = &xfs_rmapbt_buf_ops, 862 .work = &xfs_rmaproot_init, 863 .need_init = xfs_has_rmapbt(mp) 864 }, 865 { /* REFC root block */ 866 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)), 867 .numblks = BTOBB(mp->m_sb.sb_blocksize), 868 .ops = &xfs_refcountbt_buf_ops, 869 .work = &xfs_btroot_init, 870 .type = XFS_BTNUM_REFC, 871 .need_init = xfs_has_reflink(mp) 872 }, 873 { /* NULL terminating block */ 874 .daddr = XFS_BUF_DADDR_NULL, 875 } 876 }; 877 struct xfs_aghdr_grow_data *dp; 878 int error = 0; 879 880 /* Account for AG free space in new AG */ 881 id->nfree += id->agsize - mp->m_ag_prealloc_blocks; 882 for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) { 883 if (!dp->need_init) 884 continue; 885 886 id->daddr = dp->daddr; 887 id->numblks = dp->numblks; 888 id->type = dp->type; 889 error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops); 890 if (error) 891 break; 892 } 893 return error; 894 } 895 896 int 897 xfs_ag_shrink_space( 898 struct xfs_perag *pag, 899 struct xfs_trans **tpp, 900 xfs_extlen_t delta) 901 { 902 struct xfs_mount *mp = pag->pag_mount; 903 struct xfs_alloc_arg args = { 904 .tp = *tpp, 905 .mp = mp, 906 .pag = pag, 907 .minlen = delta, 908 .maxlen = delta, 909 .oinfo = XFS_RMAP_OINFO_SKIP_UPDATE, 910 .resv = XFS_AG_RESV_NONE, 911 .prod = 1 912 }; 913 struct xfs_buf *agibp, *agfbp; 914 struct xfs_agi *agi; 915 struct xfs_agf *agf; 916 xfs_agblock_t aglen; 917 int error, err2; 918 919 ASSERT(pag->pag_agno == mp->m_sb.sb_agcount - 1); 920 error = xfs_ialloc_read_agi(pag, *tpp, &agibp); 921 if (error) 922 return error; 923 924 agi = agibp->b_addr; 925 926 error = xfs_alloc_read_agf(pag, *tpp, 0, &agfbp); 927 if (error) 928 return error; 929 930 agf = agfbp->b_addr; 931 aglen = be32_to_cpu(agi->agi_length); 932 /* some extra paranoid checks before we shrink the ag */ 933 if (XFS_IS_CORRUPT(mp, agf->agf_length != agi->agi_length)) 934 return -EFSCORRUPTED; 935 if (delta >= aglen) 936 return -EINVAL; 937 938 /* 939 * Make sure that the last inode cluster cannot overlap with the new 940 * end of the AG, even if it's sparse. 941 */ 942 error = xfs_ialloc_check_shrink(pag, *tpp, agibp, aglen - delta); 943 if (error) 944 return error; 945 946 /* 947 * Disable perag reservations so it doesn't cause the allocation request 948 * to fail. We'll reestablish reservation before we return. 949 */ 950 error = xfs_ag_resv_free(pag); 951 if (error) 952 return error; 953 954 /* internal log shouldn't also show up in the free space btrees */ 955 error = xfs_alloc_vextent_exact_bno(&args, 956 XFS_AGB_TO_FSB(mp, pag->pag_agno, aglen - delta)); 957 if (!error && args.agbno == NULLAGBLOCK) 958 error = -ENOSPC; 959 960 if (error) { 961 /* 962 * if extent allocation fails, need to roll the transaction to 963 * ensure that the AGFL fixup has been committed anyway. 964 */ 965 xfs_trans_bhold(*tpp, agfbp); 966 err2 = xfs_trans_roll(tpp); 967 if (err2) 968 return err2; 969 xfs_trans_bjoin(*tpp, agfbp); 970 goto resv_init_out; 971 } 972 973 /* 974 * if successfully deleted from freespace btrees, need to confirm 975 * per-AG reservation works as expected. 976 */ 977 be32_add_cpu(&agi->agi_length, -delta); 978 be32_add_cpu(&agf->agf_length, -delta); 979 980 err2 = xfs_ag_resv_init(pag, *tpp); 981 if (err2) { 982 be32_add_cpu(&agi->agi_length, delta); 983 be32_add_cpu(&agf->agf_length, delta); 984 if (err2 != -ENOSPC) 985 goto resv_err; 986 987 err2 = __xfs_free_extent_later(*tpp, args.fsbno, delta, NULL, 988 XFS_AG_RESV_NONE, true); 989 if (err2) 990 goto resv_err; 991 992 /* 993 * Roll the transaction before trying to re-init the per-ag 994 * reservation. The new transaction is clean so it will cancel 995 * without any side effects. 996 */ 997 error = xfs_defer_finish(tpp); 998 if (error) 999 return error; 1000 1001 error = -ENOSPC; 1002 goto resv_init_out; 1003 } 1004 xfs_ialloc_log_agi(*tpp, agibp, XFS_AGI_LENGTH); 1005 xfs_alloc_log_agf(*tpp, agfbp, XFS_AGF_LENGTH); 1006 return 0; 1007 1008 resv_init_out: 1009 err2 = xfs_ag_resv_init(pag, *tpp); 1010 if (!err2) 1011 return error; 1012 resv_err: 1013 xfs_warn(mp, "Error %d reserving per-AG metadata reserve pool.", err2); 1014 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1015 return err2; 1016 } 1017 1018 /* 1019 * Extent the AG indicated by the @id by the length passed in 1020 */ 1021 int 1022 xfs_ag_extend_space( 1023 struct xfs_perag *pag, 1024 struct xfs_trans *tp, 1025 xfs_extlen_t len) 1026 { 1027 struct xfs_buf *bp; 1028 struct xfs_agi *agi; 1029 struct xfs_agf *agf; 1030 int error; 1031 1032 ASSERT(pag->pag_agno == pag->pag_mount->m_sb.sb_agcount - 1); 1033 1034 error = xfs_ialloc_read_agi(pag, tp, &bp); 1035 if (error) 1036 return error; 1037 1038 agi = bp->b_addr; 1039 be32_add_cpu(&agi->agi_length, len); 1040 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 1041 1042 /* 1043 * Change agf length. 1044 */ 1045 error = xfs_alloc_read_agf(pag, tp, 0, &bp); 1046 if (error) 1047 return error; 1048 1049 agf = bp->b_addr; 1050 be32_add_cpu(&agf->agf_length, len); 1051 ASSERT(agf->agf_length == agi->agi_length); 1052 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 1053 1054 /* 1055 * Free the new space. 1056 * 1057 * XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that 1058 * this doesn't actually exist in the rmap btree. 1059 */ 1060 error = xfs_rmap_free(tp, bp, pag, be32_to_cpu(agf->agf_length) - len, 1061 len, &XFS_RMAP_OINFO_SKIP_UPDATE); 1062 if (error) 1063 return error; 1064 1065 error = xfs_free_extent(tp, pag, be32_to_cpu(agf->agf_length) - len, 1066 len, &XFS_RMAP_OINFO_SKIP_UPDATE, XFS_AG_RESV_NONE); 1067 if (error) 1068 return error; 1069 1070 /* Update perag geometry */ 1071 pag->block_count = be32_to_cpu(agf->agf_length); 1072 __xfs_agino_range(pag->pag_mount, pag->block_count, &pag->agino_min, 1073 &pag->agino_max); 1074 return 0; 1075 } 1076 1077 /* Retrieve AG geometry. */ 1078 int 1079 xfs_ag_get_geometry( 1080 struct xfs_perag *pag, 1081 struct xfs_ag_geometry *ageo) 1082 { 1083 struct xfs_buf *agi_bp; 1084 struct xfs_buf *agf_bp; 1085 struct xfs_agi *agi; 1086 struct xfs_agf *agf; 1087 unsigned int freeblks; 1088 int error; 1089 1090 /* Lock the AG headers. */ 1091 error = xfs_ialloc_read_agi(pag, NULL, &agi_bp); 1092 if (error) 1093 return error; 1094 error = xfs_alloc_read_agf(pag, NULL, 0, &agf_bp); 1095 if (error) 1096 goto out_agi; 1097 1098 /* Fill out form. */ 1099 memset(ageo, 0, sizeof(*ageo)); 1100 ageo->ag_number = pag->pag_agno; 1101 1102 agi = agi_bp->b_addr; 1103 ageo->ag_icount = be32_to_cpu(agi->agi_count); 1104 ageo->ag_ifree = be32_to_cpu(agi->agi_freecount); 1105 1106 agf = agf_bp->b_addr; 1107 ageo->ag_length = be32_to_cpu(agf->agf_length); 1108 freeblks = pag->pagf_freeblks + 1109 pag->pagf_flcount + 1110 pag->pagf_btreeblks - 1111 xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE); 1112 ageo->ag_freeblks = freeblks; 1113 xfs_ag_geom_health(pag, ageo); 1114 1115 /* Release resources. */ 1116 xfs_buf_relse(agf_bp); 1117 out_agi: 1118 xfs_buf_relse(agi_bp); 1119 return error; 1120 } 1121