1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_sb.h" 25 #include "xfs_mount.h" 26 #include "xfs_defer.h" 27 #include "xfs_da_format.h" 28 #include "xfs_da_btree.h" 29 #include "xfs_inode.h" 30 #include "xfs_trans.h" 31 #include "xfs_inode_item.h" 32 #include "xfs_error.h" 33 #include "xfs_btree.h" 34 #include "xfs_alloc_btree.h" 35 #include "xfs_alloc.h" 36 #include "xfs_rmap_btree.h" 37 #include "xfs_ialloc.h" 38 #include "xfs_fsops.h" 39 #include "xfs_itable.h" 40 #include "xfs_trans_space.h" 41 #include "xfs_rtalloc.h" 42 #include "xfs_trace.h" 43 #include "xfs_log.h" 44 #include "xfs_filestream.h" 45 #include "xfs_rmap.h" 46 #include "xfs_ag_resv.h" 47 48 /* 49 * File system operations 50 */ 51 52 static struct xfs_buf * 53 xfs_growfs_get_hdr_buf( 54 struct xfs_mount *mp, 55 xfs_daddr_t blkno, 56 size_t numblks, 57 int flags, 58 const struct xfs_buf_ops *ops) 59 { 60 struct xfs_buf *bp; 61 62 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 63 if (!bp) 64 return NULL; 65 66 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 67 bp->b_bn = blkno; 68 bp->b_maps[0].bm_bn = blkno; 69 bp->b_ops = ops; 70 71 return bp; 72 } 73 74 static int 75 xfs_growfs_data_private( 76 xfs_mount_t *mp, /* mount point for filesystem */ 77 xfs_growfs_data_t *in) /* growfs data input struct */ 78 { 79 xfs_agf_t *agf; 80 struct xfs_agfl *agfl; 81 xfs_agi_t *agi; 82 xfs_agnumber_t agno; 83 xfs_extlen_t agsize; 84 xfs_extlen_t tmpsize; 85 xfs_alloc_rec_t *arec; 86 xfs_buf_t *bp; 87 int bucket; 88 int dpct; 89 int error, saved_error = 0; 90 xfs_agnumber_t nagcount; 91 xfs_agnumber_t nagimax = 0; 92 xfs_rfsblock_t nb, nb_mod; 93 xfs_rfsblock_t new; 94 xfs_rfsblock_t nfree; 95 xfs_agnumber_t oagcount; 96 int pct; 97 xfs_trans_t *tp; 98 99 nb = in->newblocks; 100 pct = in->imaxpct; 101 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 102 return -EINVAL; 103 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 104 return error; 105 dpct = pct - mp->m_sb.sb_imax_pct; 106 error = xfs_buf_read_uncached(mp->m_ddev_targp, 107 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 108 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); 109 if (error) 110 return error; 111 xfs_buf_relse(bp); 112 113 new = nb; /* use new as a temporary here */ 114 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 115 nagcount = new + (nb_mod != 0); 116 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 117 nagcount--; 118 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 119 if (nb < mp->m_sb.sb_dblocks) 120 return -EINVAL; 121 } 122 new = nb - mp->m_sb.sb_dblocks; 123 oagcount = mp->m_sb.sb_agcount; 124 125 /* allocate the new per-ag structures */ 126 if (nagcount > oagcount) { 127 error = xfs_initialize_perag(mp, nagcount, &nagimax); 128 if (error) 129 return error; 130 } 131 132 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, 133 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); 134 if (error) 135 return error; 136 137 /* 138 * Write new AG headers to disk. Non-transactional, but written 139 * synchronously so they are completed prior to the growfs transaction 140 * being logged. 141 */ 142 nfree = 0; 143 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 144 __be32 *agfl_bno; 145 146 /* 147 * AG freespace header block 148 */ 149 bp = xfs_growfs_get_hdr_buf(mp, 150 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 151 XFS_FSS_TO_BB(mp, 1), 0, 152 &xfs_agf_buf_ops); 153 if (!bp) { 154 error = -ENOMEM; 155 goto error0; 156 } 157 158 agf = XFS_BUF_TO_AGF(bp); 159 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 160 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 161 agf->agf_seqno = cpu_to_be32(agno); 162 if (agno == nagcount - 1) 163 agsize = 164 nb - 165 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 166 else 167 agsize = mp->m_sb.sb_agblocks; 168 agf->agf_length = cpu_to_be32(agsize); 169 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 170 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 171 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 172 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 173 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { 174 agf->agf_roots[XFS_BTNUM_RMAPi] = 175 cpu_to_be32(XFS_RMAP_BLOCK(mp)); 176 agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1); 177 agf->agf_rmap_blocks = cpu_to_be32(1); 178 } 179 180 agf->agf_flfirst = cpu_to_be32(1); 181 agf->agf_fllast = 0; 182 agf->agf_flcount = 0; 183 tmpsize = agsize - mp->m_ag_prealloc_blocks; 184 agf->agf_freeblks = cpu_to_be32(tmpsize); 185 agf->agf_longest = cpu_to_be32(tmpsize); 186 if (xfs_sb_version_hascrc(&mp->m_sb)) 187 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); 188 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 189 agf->agf_refcount_root = cpu_to_be32( 190 xfs_refc_block(mp)); 191 agf->agf_refcount_level = cpu_to_be32(1); 192 agf->agf_refcount_blocks = cpu_to_be32(1); 193 } 194 195 error = xfs_bwrite(bp); 196 xfs_buf_relse(bp); 197 if (error) 198 goto error0; 199 200 /* 201 * AG freelist header block 202 */ 203 bp = xfs_growfs_get_hdr_buf(mp, 204 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 205 XFS_FSS_TO_BB(mp, 1), 0, 206 &xfs_agfl_buf_ops); 207 if (!bp) { 208 error = -ENOMEM; 209 goto error0; 210 } 211 212 agfl = XFS_BUF_TO_AGFL(bp); 213 if (xfs_sb_version_hascrc(&mp->m_sb)) { 214 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 215 agfl->agfl_seqno = cpu_to_be32(agno); 216 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); 217 } 218 219 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 220 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 221 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 222 223 error = xfs_bwrite(bp); 224 xfs_buf_relse(bp); 225 if (error) 226 goto error0; 227 228 /* 229 * AG inode header block 230 */ 231 bp = xfs_growfs_get_hdr_buf(mp, 232 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 233 XFS_FSS_TO_BB(mp, 1), 0, 234 &xfs_agi_buf_ops); 235 if (!bp) { 236 error = -ENOMEM; 237 goto error0; 238 } 239 240 agi = XFS_BUF_TO_AGI(bp); 241 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 242 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 243 agi->agi_seqno = cpu_to_be32(agno); 244 agi->agi_length = cpu_to_be32(agsize); 245 agi->agi_count = 0; 246 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 247 agi->agi_level = cpu_to_be32(1); 248 agi->agi_freecount = 0; 249 agi->agi_newino = cpu_to_be32(NULLAGINO); 250 agi->agi_dirino = cpu_to_be32(NULLAGINO); 251 if (xfs_sb_version_hascrc(&mp->m_sb)) 252 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); 253 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 254 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 255 agi->agi_free_level = cpu_to_be32(1); 256 } 257 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 258 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 259 260 error = xfs_bwrite(bp); 261 xfs_buf_relse(bp); 262 if (error) 263 goto error0; 264 265 /* 266 * BNO btree root block 267 */ 268 bp = xfs_growfs_get_hdr_buf(mp, 269 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 270 BTOBB(mp->m_sb.sb_blocksize), 0, 271 &xfs_allocbt_buf_ops); 272 273 if (!bp) { 274 error = -ENOMEM; 275 goto error0; 276 } 277 278 xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, agno, 0); 279 280 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 281 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks); 282 arec->ar_blockcount = cpu_to_be32( 283 agsize - be32_to_cpu(arec->ar_startblock)); 284 285 error = xfs_bwrite(bp); 286 xfs_buf_relse(bp); 287 if (error) 288 goto error0; 289 290 /* 291 * CNT btree root block 292 */ 293 bp = xfs_growfs_get_hdr_buf(mp, 294 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 295 BTOBB(mp->m_sb.sb_blocksize), 0, 296 &xfs_allocbt_buf_ops); 297 if (!bp) { 298 error = -ENOMEM; 299 goto error0; 300 } 301 302 xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, agno, 0); 303 304 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 305 arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks); 306 arec->ar_blockcount = cpu_to_be32( 307 agsize - be32_to_cpu(arec->ar_startblock)); 308 nfree += be32_to_cpu(arec->ar_blockcount); 309 310 error = xfs_bwrite(bp); 311 xfs_buf_relse(bp); 312 if (error) 313 goto error0; 314 315 /* RMAP btree root block */ 316 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { 317 struct xfs_rmap_rec *rrec; 318 struct xfs_btree_block *block; 319 320 bp = xfs_growfs_get_hdr_buf(mp, 321 XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)), 322 BTOBB(mp->m_sb.sb_blocksize), 0, 323 &xfs_rmapbt_buf_ops); 324 if (!bp) { 325 error = -ENOMEM; 326 goto error0; 327 } 328 329 xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 0, 330 agno, 0); 331 block = XFS_BUF_TO_BLOCK(bp); 332 333 334 /* 335 * mark the AG header regions as static metadata The BNO 336 * btree block is the first block after the headers, so 337 * it's location defines the size of region the static 338 * metadata consumes. 339 * 340 * Note: unlike mkfs, we never have to account for log 341 * space when growing the data regions 342 */ 343 rrec = XFS_RMAP_REC_ADDR(block, 1); 344 rrec->rm_startblock = 0; 345 rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp)); 346 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS); 347 rrec->rm_offset = 0; 348 be16_add_cpu(&block->bb_numrecs, 1); 349 350 /* account freespace btree root blocks */ 351 rrec = XFS_RMAP_REC_ADDR(block, 2); 352 rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp)); 353 rrec->rm_blockcount = cpu_to_be32(2); 354 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 355 rrec->rm_offset = 0; 356 be16_add_cpu(&block->bb_numrecs, 1); 357 358 /* account inode btree root blocks */ 359 rrec = XFS_RMAP_REC_ADDR(block, 3); 360 rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp)); 361 rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) - 362 XFS_IBT_BLOCK(mp)); 363 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT); 364 rrec->rm_offset = 0; 365 be16_add_cpu(&block->bb_numrecs, 1); 366 367 /* account for rmap btree root */ 368 rrec = XFS_RMAP_REC_ADDR(block, 4); 369 rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp)); 370 rrec->rm_blockcount = cpu_to_be32(1); 371 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); 372 rrec->rm_offset = 0; 373 be16_add_cpu(&block->bb_numrecs, 1); 374 375 /* account for refc btree root */ 376 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 377 rrec = XFS_RMAP_REC_ADDR(block, 5); 378 rrec->rm_startblock = cpu_to_be32( 379 xfs_refc_block(mp)); 380 rrec->rm_blockcount = cpu_to_be32(1); 381 rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC); 382 rrec->rm_offset = 0; 383 be16_add_cpu(&block->bb_numrecs, 1); 384 } 385 386 error = xfs_bwrite(bp); 387 xfs_buf_relse(bp); 388 if (error) 389 goto error0; 390 } 391 392 /* 393 * INO btree root block 394 */ 395 bp = xfs_growfs_get_hdr_buf(mp, 396 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 397 BTOBB(mp->m_sb.sb_blocksize), 0, 398 &xfs_inobt_buf_ops); 399 if (!bp) { 400 error = -ENOMEM; 401 goto error0; 402 } 403 404 xfs_btree_init_block(mp, bp, XFS_BTNUM_INO , 0, 0, agno, 0); 405 406 error = xfs_bwrite(bp); 407 xfs_buf_relse(bp); 408 if (error) 409 goto error0; 410 411 /* 412 * FINO btree root block 413 */ 414 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 415 bp = xfs_growfs_get_hdr_buf(mp, 416 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), 417 BTOBB(mp->m_sb.sb_blocksize), 0, 418 &xfs_inobt_buf_ops); 419 if (!bp) { 420 error = -ENOMEM; 421 goto error0; 422 } 423 424 xfs_btree_init_block(mp, bp, XFS_BTNUM_FINO, 425 0, 0, agno, 0); 426 427 error = xfs_bwrite(bp); 428 xfs_buf_relse(bp); 429 if (error) 430 goto error0; 431 } 432 433 /* 434 * refcount btree root block 435 */ 436 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 437 bp = xfs_growfs_get_hdr_buf(mp, 438 XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)), 439 BTOBB(mp->m_sb.sb_blocksize), 0, 440 &xfs_refcountbt_buf_ops); 441 if (!bp) { 442 error = -ENOMEM; 443 goto error0; 444 } 445 446 xfs_btree_init_block(mp, bp, XFS_BTNUM_REFC, 447 0, 0, agno, 0); 448 449 error = xfs_bwrite(bp); 450 xfs_buf_relse(bp); 451 if (error) 452 goto error0; 453 } 454 } 455 xfs_trans_agblocks_delta(tp, nfree); 456 /* 457 * There are new blocks in the old last a.g. 458 */ 459 if (new) { 460 struct xfs_owner_info oinfo; 461 462 /* 463 * Change the agi length. 464 */ 465 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 466 if (error) { 467 goto error0; 468 } 469 ASSERT(bp); 470 agi = XFS_BUF_TO_AGI(bp); 471 be32_add_cpu(&agi->agi_length, new); 472 ASSERT(nagcount == oagcount || 473 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 474 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 475 /* 476 * Change agf length. 477 */ 478 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 479 if (error) { 480 goto error0; 481 } 482 ASSERT(bp); 483 agf = XFS_BUF_TO_AGF(bp); 484 be32_add_cpu(&agf->agf_length, new); 485 ASSERT(be32_to_cpu(agf->agf_length) == 486 be32_to_cpu(agi->agi_length)); 487 488 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 489 490 /* 491 * Free the new space. 492 * 493 * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that 494 * this doesn't actually exist in the rmap btree. 495 */ 496 xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL); 497 error = xfs_rmap_free(tp, bp, agno, 498 be32_to_cpu(agf->agf_length) - new, 499 new, &oinfo); 500 if (error) 501 goto error0; 502 error = xfs_free_extent(tp, 503 XFS_AGB_TO_FSB(mp, agno, 504 be32_to_cpu(agf->agf_length) - new), 505 new, &oinfo, XFS_AG_RESV_NONE); 506 if (error) 507 goto error0; 508 } 509 510 /* 511 * Update changed superblock fields transactionally. These are not 512 * seen by the rest of the world until the transaction commit applies 513 * them atomically to the superblock. 514 */ 515 if (nagcount > oagcount) 516 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 517 if (nb > mp->m_sb.sb_dblocks) 518 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 519 nb - mp->m_sb.sb_dblocks); 520 if (nfree) 521 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 522 if (dpct) 523 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 524 xfs_trans_set_sync(tp); 525 error = xfs_trans_commit(tp); 526 if (error) 527 return error; 528 529 /* New allocation groups fully initialized, so update mount struct */ 530 if (nagimax) 531 mp->m_maxagi = nagimax; 532 if (mp->m_sb.sb_imax_pct) { 533 uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 534 do_div(icount, 100); 535 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 536 } else 537 mp->m_maxicount = 0; 538 xfs_set_low_space_thresholds(mp); 539 mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); 540 541 /* 542 * If we expanded the last AG, free the per-AG reservation 543 * so we can reinitialize it with the new size. 544 */ 545 if (new) { 546 struct xfs_perag *pag; 547 548 pag = xfs_perag_get(mp, agno); 549 error = xfs_ag_resv_free(pag); 550 xfs_perag_put(pag); 551 if (error) 552 goto out; 553 } 554 555 /* Reserve AG metadata blocks. */ 556 error = xfs_fs_reserve_ag_blocks(mp); 557 if (error && error != -ENOSPC) 558 goto out; 559 560 /* update secondary superblocks. */ 561 for (agno = 1; agno < nagcount; agno++) { 562 error = 0; 563 /* 564 * new secondary superblocks need to be zeroed, not read from 565 * disk as the contents of the new area we are growing into is 566 * completely unknown. 567 */ 568 if (agno < oagcount) { 569 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 570 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 571 XFS_FSS_TO_BB(mp, 1), 0, &bp, 572 &xfs_sb_buf_ops); 573 } else { 574 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 575 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 576 XFS_FSS_TO_BB(mp, 1), 0); 577 if (bp) { 578 bp->b_ops = &xfs_sb_buf_ops; 579 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 580 } else 581 error = -ENOMEM; 582 } 583 584 /* 585 * If we get an error reading or writing alternate superblocks, 586 * continue. xfs_repair chooses the "best" superblock based 587 * on most matches; if we break early, we'll leave more 588 * superblocks un-updated than updated, and xfs_repair may 589 * pick them over the properly-updated primary. 590 */ 591 if (error) { 592 xfs_warn(mp, 593 "error %d reading secondary superblock for ag %d", 594 error, agno); 595 saved_error = error; 596 continue; 597 } 598 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); 599 600 error = xfs_bwrite(bp); 601 xfs_buf_relse(bp); 602 if (error) { 603 xfs_warn(mp, 604 "write error %d updating secondary superblock for ag %d", 605 error, agno); 606 saved_error = error; 607 continue; 608 } 609 } 610 611 out: 612 return saved_error ? saved_error : error; 613 614 error0: 615 xfs_trans_cancel(tp); 616 return error; 617 } 618 619 static int 620 xfs_growfs_log_private( 621 xfs_mount_t *mp, /* mount point for filesystem */ 622 xfs_growfs_log_t *in) /* growfs log input struct */ 623 { 624 xfs_extlen_t nb; 625 626 nb = in->newblocks; 627 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 628 return -EINVAL; 629 if (nb == mp->m_sb.sb_logblocks && 630 in->isint == (mp->m_sb.sb_logstart != 0)) 631 return -EINVAL; 632 /* 633 * Moving the log is hard, need new interfaces to sync 634 * the log first, hold off all activity while moving it. 635 * Can have shorter or longer log in the same space, 636 * or transform internal to external log or vice versa. 637 */ 638 return -ENOSYS; 639 } 640 641 /* 642 * protected versions of growfs function acquire and release locks on the mount 643 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 644 * XFS_IOC_FSGROWFSRT 645 */ 646 647 648 int 649 xfs_growfs_data( 650 xfs_mount_t *mp, 651 xfs_growfs_data_t *in) 652 { 653 int error; 654 655 if (!capable(CAP_SYS_ADMIN)) 656 return -EPERM; 657 if (!mutex_trylock(&mp->m_growlock)) 658 return -EWOULDBLOCK; 659 error = xfs_growfs_data_private(mp, in); 660 /* 661 * Increment the generation unconditionally, the error could be from 662 * updating the secondary superblocks, in which case the new size 663 * is live already. 664 */ 665 mp->m_generation++; 666 mutex_unlock(&mp->m_growlock); 667 return error; 668 } 669 670 int 671 xfs_growfs_log( 672 xfs_mount_t *mp, 673 xfs_growfs_log_t *in) 674 { 675 int error; 676 677 if (!capable(CAP_SYS_ADMIN)) 678 return -EPERM; 679 if (!mutex_trylock(&mp->m_growlock)) 680 return -EWOULDBLOCK; 681 error = xfs_growfs_log_private(mp, in); 682 mutex_unlock(&mp->m_growlock); 683 return error; 684 } 685 686 /* 687 * exported through ioctl XFS_IOC_FSCOUNTS 688 */ 689 690 int 691 xfs_fs_counts( 692 xfs_mount_t *mp, 693 xfs_fsop_counts_t *cnt) 694 { 695 cnt->allocino = percpu_counter_read_positive(&mp->m_icount); 696 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); 697 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - 698 mp->m_alloc_set_aside; 699 700 spin_lock(&mp->m_sb_lock); 701 cnt->freertx = mp->m_sb.sb_frextents; 702 spin_unlock(&mp->m_sb_lock); 703 return 0; 704 } 705 706 /* 707 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 708 * 709 * xfs_reserve_blocks is called to set m_resblks 710 * in the in-core mount table. The number of unused reserved blocks 711 * is kept in m_resblks_avail. 712 * 713 * Reserve the requested number of blocks if available. Otherwise return 714 * as many as possible to satisfy the request. The actual number 715 * reserved are returned in outval 716 * 717 * A null inval pointer indicates that only the current reserved blocks 718 * available should be returned no settings are changed. 719 */ 720 721 int 722 xfs_reserve_blocks( 723 xfs_mount_t *mp, 724 uint64_t *inval, 725 xfs_fsop_resblks_t *outval) 726 { 727 int64_t lcounter, delta; 728 int64_t fdblks_delta = 0; 729 uint64_t request; 730 int64_t free; 731 int error = 0; 732 733 /* If inval is null, report current values and return */ 734 if (inval == (uint64_t *)NULL) { 735 if (!outval) 736 return -EINVAL; 737 outval->resblks = mp->m_resblks; 738 outval->resblks_avail = mp->m_resblks_avail; 739 return 0; 740 } 741 742 request = *inval; 743 744 /* 745 * With per-cpu counters, this becomes an interesting problem. we need 746 * to work out if we are freeing or allocation blocks first, then we can 747 * do the modification as necessary. 748 * 749 * We do this under the m_sb_lock so that if we are near ENOSPC, we will 750 * hold out any changes while we work out what to do. This means that 751 * the amount of free space can change while we do this, so we need to 752 * retry if we end up trying to reserve more space than is available. 753 */ 754 spin_lock(&mp->m_sb_lock); 755 756 /* 757 * If our previous reservation was larger than the current value, 758 * then move any unused blocks back to the free pool. Modify the resblks 759 * counters directly since we shouldn't have any problems unreserving 760 * space. 761 */ 762 if (mp->m_resblks > request) { 763 lcounter = mp->m_resblks_avail - request; 764 if (lcounter > 0) { /* release unused blocks */ 765 fdblks_delta = lcounter; 766 mp->m_resblks_avail -= lcounter; 767 } 768 mp->m_resblks = request; 769 if (fdblks_delta) { 770 spin_unlock(&mp->m_sb_lock); 771 error = xfs_mod_fdblocks(mp, fdblks_delta, 0); 772 spin_lock(&mp->m_sb_lock); 773 } 774 775 goto out; 776 } 777 778 /* 779 * If the request is larger than the current reservation, reserve the 780 * blocks before we update the reserve counters. Sample m_fdblocks and 781 * perform a partial reservation if the request exceeds free space. 782 */ 783 error = -ENOSPC; 784 do { 785 free = percpu_counter_sum(&mp->m_fdblocks) - 786 mp->m_alloc_set_aside; 787 if (!free) 788 break; 789 790 delta = request - mp->m_resblks; 791 lcounter = free - delta; 792 if (lcounter < 0) 793 /* We can't satisfy the request, just get what we can */ 794 fdblks_delta = free; 795 else 796 fdblks_delta = delta; 797 798 /* 799 * We'll either succeed in getting space from the free block 800 * count or we'll get an ENOSPC. If we get a ENOSPC, it means 801 * things changed while we were calculating fdblks_delta and so 802 * we should try again to see if there is anything left to 803 * reserve. 804 * 805 * Don't set the reserved flag here - we don't want to reserve 806 * the extra reserve blocks from the reserve..... 807 */ 808 spin_unlock(&mp->m_sb_lock); 809 error = xfs_mod_fdblocks(mp, -fdblks_delta, 0); 810 spin_lock(&mp->m_sb_lock); 811 } while (error == -ENOSPC); 812 813 /* 814 * Update the reserve counters if blocks have been successfully 815 * allocated. 816 */ 817 if (!error && fdblks_delta) { 818 mp->m_resblks += fdblks_delta; 819 mp->m_resblks_avail += fdblks_delta; 820 } 821 822 out: 823 if (outval) { 824 outval->resblks = mp->m_resblks; 825 outval->resblks_avail = mp->m_resblks_avail; 826 } 827 828 spin_unlock(&mp->m_sb_lock); 829 return error; 830 } 831 832 int 833 xfs_fs_goingdown( 834 xfs_mount_t *mp, 835 uint32_t inflags) 836 { 837 switch (inflags) { 838 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 839 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 840 841 if (sb && !IS_ERR(sb)) { 842 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 843 thaw_bdev(sb->s_bdev, sb); 844 } 845 846 break; 847 } 848 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 849 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 850 break; 851 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 852 xfs_force_shutdown(mp, 853 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 854 break; 855 default: 856 return -EINVAL; 857 } 858 859 return 0; 860 } 861 862 /* 863 * Force a shutdown of the filesystem instantly while keeping the filesystem 864 * consistent. We don't do an unmount here; just shutdown the shop, make sure 865 * that absolutely nothing persistent happens to this filesystem after this 866 * point. 867 */ 868 void 869 xfs_do_force_shutdown( 870 xfs_mount_t *mp, 871 int flags, 872 char *fname, 873 int lnnum) 874 { 875 int logerror; 876 877 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 878 879 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 880 xfs_notice(mp, 881 "%s(0x%x) called from line %d of file %s. Return address = "PTR_FMT, 882 __func__, flags, lnnum, fname, __return_address); 883 } 884 /* 885 * No need to duplicate efforts. 886 */ 887 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 888 return; 889 890 /* 891 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 892 * queue up anybody new on the log reservations, and wakes up 893 * everybody who's sleeping on log reservations to tell them 894 * the bad news. 895 */ 896 if (xfs_log_force_umount(mp, logerror)) 897 return; 898 899 if (flags & SHUTDOWN_CORRUPT_INCORE) { 900 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 901 "Corruption of in-memory data detected. Shutting down filesystem"); 902 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 903 xfs_stack_trace(); 904 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 905 if (logerror) { 906 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 907 "Log I/O Error Detected. Shutting down filesystem"); 908 } else if (flags & SHUTDOWN_DEVICE_REQ) { 909 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 910 "All device paths lost. Shutting down filesystem"); 911 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 912 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 913 "I/O Error Detected. Shutting down filesystem"); 914 } 915 } 916 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 917 xfs_alert(mp, 918 "Please umount the filesystem and rectify the problem(s)"); 919 } 920 } 921 922 /* 923 * Reserve free space for per-AG metadata. 924 */ 925 int 926 xfs_fs_reserve_ag_blocks( 927 struct xfs_mount *mp) 928 { 929 xfs_agnumber_t agno; 930 struct xfs_perag *pag; 931 int error = 0; 932 int err2; 933 934 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { 935 pag = xfs_perag_get(mp, agno); 936 err2 = xfs_ag_resv_init(pag); 937 xfs_perag_put(pag); 938 if (err2 && !error) 939 error = err2; 940 } 941 942 if (error && error != -ENOSPC) { 943 xfs_warn(mp, 944 "Error %d reserving per-AG metadata reserve pool.", error); 945 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 946 } 947 948 return error; 949 } 950 951 /* 952 * Free space reserved for per-AG metadata. 953 */ 954 int 955 xfs_fs_unreserve_ag_blocks( 956 struct xfs_mount *mp) 957 { 958 xfs_agnumber_t agno; 959 struct xfs_perag *pag; 960 int error = 0; 961 int err2; 962 963 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { 964 pag = xfs_perag_get(mp, agno); 965 err2 = xfs_ag_resv_free(pag); 966 xfs_perag_put(pag); 967 if (err2 && !error) 968 error = err2; 969 } 970 971 if (error) 972 xfs_warn(mp, 973 "Error %d freeing per-AG metadata reserve pool.", error); 974 975 return error; 976 } 977