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 31 static int 32 xfs_get_aghdr_buf( 33 struct xfs_mount *mp, 34 xfs_daddr_t blkno, 35 size_t numblks, 36 struct xfs_buf **bpp, 37 const struct xfs_buf_ops *ops) 38 { 39 struct xfs_buf *bp; 40 int error; 41 42 error = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, 0, &bp); 43 if (error) 44 return error; 45 46 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 47 bp->b_bn = blkno; 48 bp->b_maps[0].bm_bn = blkno; 49 bp->b_ops = ops; 50 51 *bpp = bp; 52 return 0; 53 } 54 55 static inline bool is_log_ag(struct xfs_mount *mp, struct aghdr_init_data *id) 56 { 57 return mp->m_sb.sb_logstart > 0 && 58 id->agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); 59 } 60 61 /* 62 * Generic btree root block init function 63 */ 64 static void 65 xfs_btroot_init( 66 struct xfs_mount *mp, 67 struct xfs_buf *bp, 68 struct aghdr_init_data *id) 69 { 70 xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno); 71 } 72 73 /* Finish initializing a free space btree. */ 74 static void 75 xfs_freesp_init_recs( 76 struct xfs_mount *mp, 77 struct xfs_buf *bp, 78 struct aghdr_init_data *id) 79 { 80 struct xfs_alloc_rec *arec; 81 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 82 83 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 84 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks); 85 86 if (is_log_ag(mp, id)) { 87 struct xfs_alloc_rec *nrec; 88 xfs_agblock_t start = XFS_FSB_TO_AGBNO(mp, 89 mp->m_sb.sb_logstart); 90 91 ASSERT(start >= mp->m_ag_prealloc_blocks); 92 if (start != mp->m_ag_prealloc_blocks) { 93 /* 94 * Modify first record to pad stripe align of log 95 */ 96 arec->ar_blockcount = cpu_to_be32(start - 97 mp->m_ag_prealloc_blocks); 98 nrec = arec + 1; 99 100 /* 101 * Insert second record at start of internal log 102 * which then gets trimmed. 103 */ 104 nrec->ar_startblock = cpu_to_be32( 105 be32_to_cpu(arec->ar_startblock) + 106 be32_to_cpu(arec->ar_blockcount)); 107 arec = nrec; 108 be16_add_cpu(&block->bb_numrecs, 1); 109 } 110 /* 111 * Change record start to after the internal log 112 */ 113 be32_add_cpu(&arec->ar_startblock, mp->m_sb.sb_logblocks); 114 } 115 116 /* 117 * Calculate the record block count and check for the case where 118 * the log might have consumed all available space in the AG. If 119 * so, reset the record count to 0 to avoid exposure of an invalid 120 * record start block. 121 */ 122 arec->ar_blockcount = cpu_to_be32(id->agsize - 123 be32_to_cpu(arec->ar_startblock)); 124 if (!arec->ar_blockcount) 125 block->bb_numrecs = 0; 126 } 127 128 /* 129 * Alloc btree root block init functions 130 */ 131 static void 132 xfs_bnoroot_init( 133 struct xfs_mount *mp, 134 struct xfs_buf *bp, 135 struct aghdr_init_data *id) 136 { 137 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno); 138 xfs_freesp_init_recs(mp, bp, id); 139 } 140 141 static void 142 xfs_cntroot_init( 143 struct xfs_mount *mp, 144 struct xfs_buf *bp, 145 struct aghdr_init_data *id) 146 { 147 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno); 148 xfs_freesp_init_recs(mp, bp, id); 149 } 150 151 /* 152 * Reverse map root block init 153 */ 154 static void 155 xfs_rmaproot_init( 156 struct xfs_mount *mp, 157 struct xfs_buf *bp, 158 struct aghdr_init_data *id) 159 { 160 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 161 struct xfs_rmap_rec *rrec; 162 163 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno); 164 165 /* 166 * mark the AG header regions as static metadata The BNO 167 * btree block is the first block after the headers, so 168 * it's location defines the size of region the static 169 * metadata consumes. 170 * 171 * Note: unlike mkfs, we never have to account for log 172 * space when growing the data regions 173 */ 174 rrec = XFS_RMAP_REC_ADDR(block, 1); 175 rrec->rm_startblock = 0; 176 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp)); 177 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS); 178 rrec->rm_offset = 0; 179 180 /* account freespace btree root blocks */ 181 rrec = XFS_RMAP_REC_ADDR(block, 2); 182 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp)); 183 rrec->rm_blockcount = cpu_to_be32(2); 184 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 185 rrec->rm_offset = 0; 186 187 /* account inode btree root blocks */ 188 rrec = XFS_RMAP_REC_ADDR(block, 3); 189 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp)); 190 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) - 191 XFS_IBT_BLOCK(mp)); 192 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT); 193 rrec->rm_offset = 0; 194 195 /* account for rmap btree root */ 196 rrec = XFS_RMAP_REC_ADDR(block, 4); 197 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp)); 198 rrec->rm_blockcount = cpu_to_be32(1); 199 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 200 rrec->rm_offset = 0; 201 202 /* account for refc btree root */ 203 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 204 rrec = XFS_RMAP_REC_ADDR(block, 5); 205 rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp)); 206 rrec->rm_blockcount = cpu_to_be32(1); 207 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC); 208 rrec->rm_offset = 0; 209 be16_add_cpu(&block->bb_numrecs, 1); 210 } 211 212 /* account for the log space */ 213 if (is_log_ag(mp, id)) { 214 rrec = XFS_RMAP_REC_ADDR(block, 215 be16_to_cpu(block->bb_numrecs) + 1); 216 rrec->rm_startblock = cpu_to_be32( 217 XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart)); 218 rrec->rm_blockcount = cpu_to_be32(mp->m_sb.sb_logblocks); 219 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_LOG); 220 rrec->rm_offset = 0; 221 be16_add_cpu(&block->bb_numrecs, 1); 222 } 223 } 224 225 /* 226 * Initialise new secondary superblocks with the pre-grow geometry, but mark 227 * them as "in progress" so we know they haven't yet been activated. This will 228 * get cleared when the update with the new geometry information is done after 229 * changes to the primary are committed. This isn't strictly necessary, but we 230 * get it for free with the delayed buffer write lists and it means we can tell 231 * if a grow operation didn't complete properly after the fact. 232 */ 233 static void 234 xfs_sbblock_init( 235 struct xfs_mount *mp, 236 struct xfs_buf *bp, 237 struct aghdr_init_data *id) 238 { 239 struct xfs_dsb *dsb = bp->b_addr; 240 241 xfs_sb_to_disk(dsb, &mp->m_sb); 242 dsb->sb_inprogress = 1; 243 } 244 245 static void 246 xfs_agfblock_init( 247 struct xfs_mount *mp, 248 struct xfs_buf *bp, 249 struct aghdr_init_data *id) 250 { 251 struct xfs_agf *agf = bp->b_addr; 252 xfs_extlen_t tmpsize; 253 254 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 255 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 256 agf->agf_seqno = cpu_to_be32(id->agno); 257 agf->agf_length = cpu_to_be32(id->agsize); 258 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 259 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 260 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 261 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 262 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { 263 agf->agf_roots[XFS_BTNUM_RMAPi] = 264 cpu_to_be32(XFS_RMAP_BLOCK(mp)); 265 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1); 266 agf->agf_rmap_blocks = cpu_to_be32(1); 267 } 268 269 agf->agf_flfirst = cpu_to_be32(1); 270 agf->agf_fllast = 0; 271 agf->agf_flcount = 0; 272 tmpsize = id->agsize - mp->m_ag_prealloc_blocks; 273 agf->agf_freeblks = cpu_to_be32(tmpsize); 274 agf->agf_longest = cpu_to_be32(tmpsize); 275 if (xfs_sb_version_hascrc(&mp->m_sb)) 276 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); 277 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 278 agf->agf_refcount_root = cpu_to_be32( 279 xfs_refc_block(mp)); 280 agf->agf_refcount_level = cpu_to_be32(1); 281 agf->agf_refcount_blocks = cpu_to_be32(1); 282 } 283 284 if (is_log_ag(mp, id)) { 285 int64_t logblocks = mp->m_sb.sb_logblocks; 286 287 be32_add_cpu(&agf->agf_freeblks, -logblocks); 288 agf->agf_longest = cpu_to_be32(id->agsize - 289 XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart) - logblocks); 290 } 291 } 292 293 static void 294 xfs_agflblock_init( 295 struct xfs_mount *mp, 296 struct xfs_buf *bp, 297 struct aghdr_init_data *id) 298 { 299 struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); 300 __be32 *agfl_bno; 301 int bucket; 302 303 if (xfs_sb_version_hascrc(&mp->m_sb)) { 304 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 305 agfl->agfl_seqno = cpu_to_be32(id->agno); 306 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); 307 } 308 309 agfl_bno = xfs_buf_to_agfl_bno(bp); 310 for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++) 311 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 312 } 313 314 static void 315 xfs_agiblock_init( 316 struct xfs_mount *mp, 317 struct xfs_buf *bp, 318 struct aghdr_init_data *id) 319 { 320 struct xfs_agi *agi = bp->b_addr; 321 int bucket; 322 323 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 324 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 325 agi->agi_seqno = cpu_to_be32(id->agno); 326 agi->agi_length = cpu_to_be32(id->agsize); 327 agi->agi_count = 0; 328 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 329 agi->agi_level = cpu_to_be32(1); 330 agi->agi_freecount = 0; 331 agi->agi_newino = cpu_to_be32(NULLAGINO); 332 agi->agi_dirino = cpu_to_be32(NULLAGINO); 333 if (xfs_sb_version_hascrc(&mp->m_sb)) 334 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); 335 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 336 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 337 agi->agi_free_level = cpu_to_be32(1); 338 } 339 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 340 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 341 if (xfs_sb_version_hasinobtcounts(&mp->m_sb)) { 342 agi->agi_iblocks = cpu_to_be32(1); 343 if (xfs_sb_version_hasfinobt(&mp->m_sb)) 344 agi->agi_fblocks = cpu_to_be32(1); 345 } 346 } 347 348 typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp, 349 struct aghdr_init_data *id); 350 static int 351 xfs_ag_init_hdr( 352 struct xfs_mount *mp, 353 struct aghdr_init_data *id, 354 aghdr_init_work_f work, 355 const struct xfs_buf_ops *ops) 356 { 357 struct xfs_buf *bp; 358 int error; 359 360 error = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, &bp, ops); 361 if (error) 362 return error; 363 364 (*work)(mp, bp, id); 365 366 xfs_buf_delwri_queue(bp, &id->buffer_list); 367 xfs_buf_relse(bp); 368 return 0; 369 } 370 371 struct xfs_aghdr_grow_data { 372 xfs_daddr_t daddr; 373 size_t numblks; 374 const struct xfs_buf_ops *ops; 375 aghdr_init_work_f work; 376 xfs_btnum_t type; 377 bool need_init; 378 }; 379 380 /* 381 * Prepare new AG headers to be written to disk. We use uncached buffers here, 382 * as it is assumed these new AG headers are currently beyond the currently 383 * valid filesystem address space. Using cached buffers would trip over EOFS 384 * corruption detection alogrithms in the buffer cache lookup routines. 385 * 386 * This is a non-transactional function, but the prepared buffers are added to a 387 * delayed write buffer list supplied by the caller so they can submit them to 388 * disk and wait on them as required. 389 */ 390 int 391 xfs_ag_init_headers( 392 struct xfs_mount *mp, 393 struct aghdr_init_data *id) 394 395 { 396 struct xfs_aghdr_grow_data aghdr_data[] = { 397 { /* SB */ 398 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR), 399 .numblks = XFS_FSS_TO_BB(mp, 1), 400 .ops = &xfs_sb_buf_ops, 401 .work = &xfs_sbblock_init, 402 .need_init = true 403 }, 404 { /* AGF */ 405 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)), 406 .numblks = XFS_FSS_TO_BB(mp, 1), 407 .ops = &xfs_agf_buf_ops, 408 .work = &xfs_agfblock_init, 409 .need_init = true 410 }, 411 { /* AGFL */ 412 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)), 413 .numblks = XFS_FSS_TO_BB(mp, 1), 414 .ops = &xfs_agfl_buf_ops, 415 .work = &xfs_agflblock_init, 416 .need_init = true 417 }, 418 { /* AGI */ 419 .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)), 420 .numblks = XFS_FSS_TO_BB(mp, 1), 421 .ops = &xfs_agi_buf_ops, 422 .work = &xfs_agiblock_init, 423 .need_init = true 424 }, 425 { /* BNO root block */ 426 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)), 427 .numblks = BTOBB(mp->m_sb.sb_blocksize), 428 .ops = &xfs_bnobt_buf_ops, 429 .work = &xfs_bnoroot_init, 430 .need_init = true 431 }, 432 { /* CNT root block */ 433 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)), 434 .numblks = BTOBB(mp->m_sb.sb_blocksize), 435 .ops = &xfs_cntbt_buf_ops, 436 .work = &xfs_cntroot_init, 437 .need_init = true 438 }, 439 { /* INO root block */ 440 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)), 441 .numblks = BTOBB(mp->m_sb.sb_blocksize), 442 .ops = &xfs_inobt_buf_ops, 443 .work = &xfs_btroot_init, 444 .type = XFS_BTNUM_INO, 445 .need_init = true 446 }, 447 { /* FINO root block */ 448 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)), 449 .numblks = BTOBB(mp->m_sb.sb_blocksize), 450 .ops = &xfs_finobt_buf_ops, 451 .work = &xfs_btroot_init, 452 .type = XFS_BTNUM_FINO, 453 .need_init = xfs_sb_version_hasfinobt(&mp->m_sb) 454 }, 455 { /* RMAP root block */ 456 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)), 457 .numblks = BTOBB(mp->m_sb.sb_blocksize), 458 .ops = &xfs_rmapbt_buf_ops, 459 .work = &xfs_rmaproot_init, 460 .need_init = xfs_sb_version_hasrmapbt(&mp->m_sb) 461 }, 462 { /* REFC root block */ 463 .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)), 464 .numblks = BTOBB(mp->m_sb.sb_blocksize), 465 .ops = &xfs_refcountbt_buf_ops, 466 .work = &xfs_btroot_init, 467 .type = XFS_BTNUM_REFC, 468 .need_init = xfs_sb_version_hasreflink(&mp->m_sb) 469 }, 470 { /* NULL terminating block */ 471 .daddr = XFS_BUF_DADDR_NULL, 472 } 473 }; 474 struct xfs_aghdr_grow_data *dp; 475 int error = 0; 476 477 /* Account for AG free space in new AG */ 478 id->nfree += id->agsize - mp->m_ag_prealloc_blocks; 479 for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) { 480 if (!dp->need_init) 481 continue; 482 483 id->daddr = dp->daddr; 484 id->numblks = dp->numblks; 485 id->type = dp->type; 486 error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops); 487 if (error) 488 break; 489 } 490 return error; 491 } 492 493 int 494 xfs_ag_shrink_space( 495 struct xfs_mount *mp, 496 struct xfs_trans **tpp, 497 xfs_agnumber_t agno, 498 xfs_extlen_t delta) 499 { 500 struct xfs_alloc_arg args = { 501 .tp = *tpp, 502 .mp = mp, 503 .type = XFS_ALLOCTYPE_THIS_BNO, 504 .minlen = delta, 505 .maxlen = delta, 506 .oinfo = XFS_RMAP_OINFO_SKIP_UPDATE, 507 .resv = XFS_AG_RESV_NONE, 508 .prod = 1 509 }; 510 struct xfs_buf *agibp, *agfbp; 511 struct xfs_agi *agi; 512 struct xfs_agf *agf; 513 int error, err2; 514 515 ASSERT(agno == mp->m_sb.sb_agcount - 1); 516 error = xfs_ialloc_read_agi(mp, *tpp, agno, &agibp); 517 if (error) 518 return error; 519 520 agi = agibp->b_addr; 521 522 error = xfs_alloc_read_agf(mp, *tpp, agno, 0, &agfbp); 523 if (error) 524 return error; 525 526 agf = agfbp->b_addr; 527 /* some extra paranoid checks before we shrink the ag */ 528 if (XFS_IS_CORRUPT(mp, agf->agf_length != agi->agi_length)) 529 return -EFSCORRUPTED; 530 if (delta >= agi->agi_length) 531 return -EINVAL; 532 533 args.fsbno = XFS_AGB_TO_FSB(mp, agno, 534 be32_to_cpu(agi->agi_length) - delta); 535 536 /* 537 * Disable perag reservations so it doesn't cause the allocation request 538 * to fail. We'll reestablish reservation before we return. 539 */ 540 error = xfs_ag_resv_free(agibp->b_pag); 541 if (error) 542 return error; 543 544 /* internal log shouldn't also show up in the free space btrees */ 545 error = xfs_alloc_vextent(&args); 546 if (!error && args.agbno == NULLAGBLOCK) 547 error = -ENOSPC; 548 549 if (error) { 550 /* 551 * if extent allocation fails, need to roll the transaction to 552 * ensure that the AGFL fixup has been committed anyway. 553 */ 554 xfs_trans_bhold(*tpp, agfbp); 555 err2 = xfs_trans_roll(tpp); 556 if (err2) 557 return err2; 558 xfs_trans_bjoin(*tpp, agfbp); 559 goto resv_init_out; 560 } 561 562 /* 563 * if successfully deleted from freespace btrees, need to confirm 564 * per-AG reservation works as expected. 565 */ 566 be32_add_cpu(&agi->agi_length, -delta); 567 be32_add_cpu(&agf->agf_length, -delta); 568 569 err2 = xfs_ag_resv_init(agibp->b_pag, *tpp); 570 if (err2) { 571 be32_add_cpu(&agi->agi_length, delta); 572 be32_add_cpu(&agf->agf_length, delta); 573 if (err2 != -ENOSPC) 574 goto resv_err; 575 576 __xfs_bmap_add_free(*tpp, args.fsbno, delta, NULL, true); 577 578 /* 579 * Roll the transaction before trying to re-init the per-ag 580 * reservation. The new transaction is clean so it will cancel 581 * without any side effects. 582 */ 583 error = xfs_defer_finish(tpp); 584 if (error) 585 return error; 586 587 error = -ENOSPC; 588 goto resv_init_out; 589 } 590 xfs_ialloc_log_agi(*tpp, agibp, XFS_AGI_LENGTH); 591 xfs_alloc_log_agf(*tpp, agfbp, XFS_AGF_LENGTH); 592 return 0; 593 resv_init_out: 594 err2 = xfs_ag_resv_init(agibp->b_pag, *tpp); 595 if (!err2) 596 return error; 597 resv_err: 598 xfs_warn(mp, "Error %d reserving per-AG metadata reserve pool.", err2); 599 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 600 return err2; 601 } 602 603 /* 604 * Extent the AG indicated by the @id by the length passed in 605 */ 606 int 607 xfs_ag_extend_space( 608 struct xfs_mount *mp, 609 struct xfs_trans *tp, 610 struct aghdr_init_data *id, 611 xfs_extlen_t len) 612 { 613 struct xfs_buf *bp; 614 struct xfs_agi *agi; 615 struct xfs_agf *agf; 616 int error; 617 618 /* 619 * Change the agi length. 620 */ 621 error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp); 622 if (error) 623 return error; 624 625 agi = bp->b_addr; 626 be32_add_cpu(&agi->agi_length, len); 627 ASSERT(id->agno == mp->m_sb.sb_agcount - 1 || 628 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 629 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 630 631 /* 632 * Change agf length. 633 */ 634 error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp); 635 if (error) 636 return error; 637 638 agf = bp->b_addr; 639 be32_add_cpu(&agf->agf_length, len); 640 ASSERT(agf->agf_length == agi->agi_length); 641 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 642 643 /* 644 * Free the new space. 645 * 646 * XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that 647 * this doesn't actually exist in the rmap btree. 648 */ 649 error = xfs_rmap_free(tp, bp, id->agno, 650 be32_to_cpu(agf->agf_length) - len, 651 len, &XFS_RMAP_OINFO_SKIP_UPDATE); 652 if (error) 653 return error; 654 655 return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno, 656 be32_to_cpu(agf->agf_length) - len), 657 len, &XFS_RMAP_OINFO_SKIP_UPDATE, 658 XFS_AG_RESV_NONE); 659 } 660 661 /* Retrieve AG geometry. */ 662 int 663 xfs_ag_get_geometry( 664 struct xfs_mount *mp, 665 xfs_agnumber_t agno, 666 struct xfs_ag_geometry *ageo) 667 { 668 struct xfs_buf *agi_bp; 669 struct xfs_buf *agf_bp; 670 struct xfs_agi *agi; 671 struct xfs_agf *agf; 672 struct xfs_perag *pag; 673 unsigned int freeblks; 674 int error; 675 676 if (agno >= mp->m_sb.sb_agcount) 677 return -EINVAL; 678 679 /* Lock the AG headers. */ 680 error = xfs_ialloc_read_agi(mp, NULL, agno, &agi_bp); 681 if (error) 682 return error; 683 error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp); 684 if (error) 685 goto out_agi; 686 687 pag = agi_bp->b_pag; 688 689 /* Fill out form. */ 690 memset(ageo, 0, sizeof(*ageo)); 691 ageo->ag_number = agno; 692 693 agi = agi_bp->b_addr; 694 ageo->ag_icount = be32_to_cpu(agi->agi_count); 695 ageo->ag_ifree = be32_to_cpu(agi->agi_freecount); 696 697 agf = agf_bp->b_addr; 698 ageo->ag_length = be32_to_cpu(agf->agf_length); 699 freeblks = pag->pagf_freeblks + 700 pag->pagf_flcount + 701 pag->pagf_btreeblks - 702 xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE); 703 ageo->ag_freeblks = freeblks; 704 xfs_ag_geom_health(pag, ageo); 705 706 /* Release resources. */ 707 xfs_buf_relse(agf_bp); 708 out_agi: 709 xfs_buf_relse(agi_bp); 710 return error; 711 } 712