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_da_format.h" 27 #include "xfs_da_btree.h" 28 #include "xfs_inode.h" 29 #include "xfs_trans.h" 30 #include "xfs_inode_item.h" 31 #include "xfs_error.h" 32 #include "xfs_btree.h" 33 #include "xfs_alloc_btree.h" 34 #include "xfs_alloc.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_fsops.h" 37 #include "xfs_itable.h" 38 #include "xfs_trans_space.h" 39 #include "xfs_rtalloc.h" 40 #include "xfs_trace.h" 41 #include "xfs_log.h" 42 #include "xfs_filestream.h" 43 44 /* 45 * File system operations 46 */ 47 48 int 49 xfs_fs_geometry( 50 xfs_mount_t *mp, 51 xfs_fsop_geom_t *geo, 52 int new_version) 53 { 54 55 memset(geo, 0, sizeof(*geo)); 56 57 geo->blocksize = mp->m_sb.sb_blocksize; 58 geo->rtextsize = mp->m_sb.sb_rextsize; 59 geo->agblocks = mp->m_sb.sb_agblocks; 60 geo->agcount = mp->m_sb.sb_agcount; 61 geo->logblocks = mp->m_sb.sb_logblocks; 62 geo->sectsize = mp->m_sb.sb_sectsize; 63 geo->inodesize = mp->m_sb.sb_inodesize; 64 geo->imaxpct = mp->m_sb.sb_imax_pct; 65 geo->datablocks = mp->m_sb.sb_dblocks; 66 geo->rtblocks = mp->m_sb.sb_rblocks; 67 geo->rtextents = mp->m_sb.sb_rextents; 68 geo->logstart = mp->m_sb.sb_logstart; 69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); 70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); 71 if (new_version >= 2) { 72 geo->sunit = mp->m_sb.sb_unit; 73 geo->swidth = mp->m_sb.sb_width; 74 } 75 if (new_version >= 3) { 76 geo->version = XFS_FSOP_GEOM_VERSION; 77 geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | 78 XFS_FSOP_GEOM_FLAGS_DIRV2 | 79 (xfs_sb_version_hasattr(&mp->m_sb) ? 80 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 81 (xfs_sb_version_hasquota(&mp->m_sb) ? 82 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 83 (xfs_sb_version_hasalign(&mp->m_sb) ? 84 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 85 (xfs_sb_version_hasdalign(&mp->m_sb) ? 86 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 87 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 88 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 89 (xfs_sb_version_hassector(&mp->m_sb) ? 90 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 91 (xfs_sb_version_hasasciici(&mp->m_sb) ? 92 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 93 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 94 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 95 (xfs_sb_version_hasattr2(&mp->m_sb) ? 96 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | 97 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? 98 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | 99 (xfs_sb_version_hascrc(&mp->m_sb) ? 100 XFS_FSOP_GEOM_FLAGS_V5SB : 0) | 101 (xfs_sb_version_hasftype(&mp->m_sb) ? 102 XFS_FSOP_GEOM_FLAGS_FTYPE : 0) | 103 (xfs_sb_version_hasfinobt(&mp->m_sb) ? 104 XFS_FSOP_GEOM_FLAGS_FINOBT : 0) | 105 (xfs_sb_version_hassparseinodes(&mp->m_sb) ? 106 XFS_FSOP_GEOM_FLAGS_SPINODES : 0); 107 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 108 mp->m_sb.sb_logsectsize : BBSIZE; 109 geo->rtsectsize = mp->m_sb.sb_blocksize; 110 geo->dirblocksize = mp->m_dir_geo->blksize; 111 } 112 if (new_version >= 4) { 113 geo->flags |= 114 (xfs_sb_version_haslogv2(&mp->m_sb) ? 115 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 116 geo->logsunit = mp->m_sb.sb_logsunit; 117 } 118 return 0; 119 } 120 121 static struct xfs_buf * 122 xfs_growfs_get_hdr_buf( 123 struct xfs_mount *mp, 124 xfs_daddr_t blkno, 125 size_t numblks, 126 int flags, 127 const struct xfs_buf_ops *ops) 128 { 129 struct xfs_buf *bp; 130 131 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 132 if (!bp) 133 return NULL; 134 135 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 136 bp->b_bn = blkno; 137 bp->b_maps[0].bm_bn = blkno; 138 bp->b_ops = ops; 139 140 return bp; 141 } 142 143 static int 144 xfs_growfs_data_private( 145 xfs_mount_t *mp, /* mount point for filesystem */ 146 xfs_growfs_data_t *in) /* growfs data input struct */ 147 { 148 xfs_agf_t *agf; 149 struct xfs_agfl *agfl; 150 xfs_agi_t *agi; 151 xfs_agnumber_t agno; 152 xfs_extlen_t agsize; 153 xfs_extlen_t tmpsize; 154 xfs_alloc_rec_t *arec; 155 xfs_buf_t *bp; 156 int bucket; 157 int dpct; 158 int error, saved_error = 0; 159 xfs_agnumber_t nagcount; 160 xfs_agnumber_t nagimax = 0; 161 xfs_rfsblock_t nb, nb_mod; 162 xfs_rfsblock_t new; 163 xfs_rfsblock_t nfree; 164 xfs_agnumber_t oagcount; 165 int pct; 166 xfs_trans_t *tp; 167 168 nb = in->newblocks; 169 pct = in->imaxpct; 170 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 171 return -EINVAL; 172 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 173 return error; 174 dpct = pct - mp->m_sb.sb_imax_pct; 175 error = xfs_buf_read_uncached(mp->m_ddev_targp, 176 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 177 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); 178 if (error) 179 return error; 180 xfs_buf_relse(bp); 181 182 new = nb; /* use new as a temporary here */ 183 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 184 nagcount = new + (nb_mod != 0); 185 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 186 nagcount--; 187 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 188 if (nb < mp->m_sb.sb_dblocks) 189 return -EINVAL; 190 } 191 new = nb - mp->m_sb.sb_dblocks; 192 oagcount = mp->m_sb.sb_agcount; 193 194 /* allocate the new per-ag structures */ 195 if (nagcount > oagcount) { 196 error = xfs_initialize_perag(mp, nagcount, &nagimax); 197 if (error) 198 return error; 199 } 200 201 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, 202 XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); 203 if (error) 204 return error; 205 206 /* 207 * Write new AG headers to disk. Non-transactional, but written 208 * synchronously so they are completed prior to the growfs transaction 209 * being logged. 210 */ 211 nfree = 0; 212 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 213 __be32 *agfl_bno; 214 215 /* 216 * AG freespace header block 217 */ 218 bp = xfs_growfs_get_hdr_buf(mp, 219 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 220 XFS_FSS_TO_BB(mp, 1), 0, 221 &xfs_agf_buf_ops); 222 if (!bp) { 223 error = -ENOMEM; 224 goto error0; 225 } 226 227 agf = XFS_BUF_TO_AGF(bp); 228 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 229 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 230 agf->agf_seqno = cpu_to_be32(agno); 231 if (agno == nagcount - 1) 232 agsize = 233 nb - 234 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 235 else 236 agsize = mp->m_sb.sb_agblocks; 237 agf->agf_length = cpu_to_be32(agsize); 238 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 239 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 240 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 241 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 242 agf->agf_flfirst = cpu_to_be32(1); 243 agf->agf_fllast = 0; 244 agf->agf_flcount = 0; 245 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 246 agf->agf_freeblks = cpu_to_be32(tmpsize); 247 agf->agf_longest = cpu_to_be32(tmpsize); 248 if (xfs_sb_version_hascrc(&mp->m_sb)) 249 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); 250 251 error = xfs_bwrite(bp); 252 xfs_buf_relse(bp); 253 if (error) 254 goto error0; 255 256 /* 257 * AG freelist header block 258 */ 259 bp = xfs_growfs_get_hdr_buf(mp, 260 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 261 XFS_FSS_TO_BB(mp, 1), 0, 262 &xfs_agfl_buf_ops); 263 if (!bp) { 264 error = -ENOMEM; 265 goto error0; 266 } 267 268 agfl = XFS_BUF_TO_AGFL(bp); 269 if (xfs_sb_version_hascrc(&mp->m_sb)) { 270 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 271 agfl->agfl_seqno = cpu_to_be32(agno); 272 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); 273 } 274 275 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 276 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 277 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 278 279 error = xfs_bwrite(bp); 280 xfs_buf_relse(bp); 281 if (error) 282 goto error0; 283 284 /* 285 * AG inode header block 286 */ 287 bp = xfs_growfs_get_hdr_buf(mp, 288 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 289 XFS_FSS_TO_BB(mp, 1), 0, 290 &xfs_agi_buf_ops); 291 if (!bp) { 292 error = -ENOMEM; 293 goto error0; 294 } 295 296 agi = XFS_BUF_TO_AGI(bp); 297 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 298 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 299 agi->agi_seqno = cpu_to_be32(agno); 300 agi->agi_length = cpu_to_be32(agsize); 301 agi->agi_count = 0; 302 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 303 agi->agi_level = cpu_to_be32(1); 304 agi->agi_freecount = 0; 305 agi->agi_newino = cpu_to_be32(NULLAGINO); 306 agi->agi_dirino = cpu_to_be32(NULLAGINO); 307 if (xfs_sb_version_hascrc(&mp->m_sb)) 308 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); 309 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 310 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); 311 agi->agi_free_level = cpu_to_be32(1); 312 } 313 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 314 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 315 316 error = xfs_bwrite(bp); 317 xfs_buf_relse(bp); 318 if (error) 319 goto error0; 320 321 /* 322 * BNO btree root block 323 */ 324 bp = xfs_growfs_get_hdr_buf(mp, 325 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 326 BTOBB(mp->m_sb.sb_blocksize), 0, 327 &xfs_allocbt_buf_ops); 328 329 if (!bp) { 330 error = -ENOMEM; 331 goto error0; 332 } 333 334 if (xfs_sb_version_hascrc(&mp->m_sb)) 335 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, 336 agno, XFS_BTREE_CRC_BLOCKS); 337 else 338 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, 339 agno, 0); 340 341 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 342 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 343 arec->ar_blockcount = cpu_to_be32( 344 agsize - be32_to_cpu(arec->ar_startblock)); 345 346 error = xfs_bwrite(bp); 347 xfs_buf_relse(bp); 348 if (error) 349 goto error0; 350 351 /* 352 * CNT btree root block 353 */ 354 bp = xfs_growfs_get_hdr_buf(mp, 355 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 356 BTOBB(mp->m_sb.sb_blocksize), 0, 357 &xfs_allocbt_buf_ops); 358 if (!bp) { 359 error = -ENOMEM; 360 goto error0; 361 } 362 363 if (xfs_sb_version_hascrc(&mp->m_sb)) 364 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, 365 agno, XFS_BTREE_CRC_BLOCKS); 366 else 367 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, 368 agno, 0); 369 370 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 371 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 372 arec->ar_blockcount = cpu_to_be32( 373 agsize - be32_to_cpu(arec->ar_startblock)); 374 nfree += be32_to_cpu(arec->ar_blockcount); 375 376 error = xfs_bwrite(bp); 377 xfs_buf_relse(bp); 378 if (error) 379 goto error0; 380 381 /* 382 * INO btree root block 383 */ 384 bp = xfs_growfs_get_hdr_buf(mp, 385 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 386 BTOBB(mp->m_sb.sb_blocksize), 0, 387 &xfs_inobt_buf_ops); 388 if (!bp) { 389 error = -ENOMEM; 390 goto error0; 391 } 392 393 if (xfs_sb_version_hascrc(&mp->m_sb)) 394 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, 395 agno, XFS_BTREE_CRC_BLOCKS); 396 else 397 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, 398 agno, 0); 399 400 error = xfs_bwrite(bp); 401 xfs_buf_relse(bp); 402 if (error) 403 goto error0; 404 405 /* 406 * FINO btree root block 407 */ 408 if (xfs_sb_version_hasfinobt(&mp->m_sb)) { 409 bp = xfs_growfs_get_hdr_buf(mp, 410 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), 411 BTOBB(mp->m_sb.sb_blocksize), 0, 412 &xfs_inobt_buf_ops); 413 if (!bp) { 414 error = -ENOMEM; 415 goto error0; 416 } 417 418 if (xfs_sb_version_hascrc(&mp->m_sb)) 419 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC, 420 0, 0, agno, 421 XFS_BTREE_CRC_BLOCKS); 422 else 423 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0, 424 0, agno, 0); 425 426 error = xfs_bwrite(bp); 427 xfs_buf_relse(bp); 428 if (error) 429 goto error0; 430 } 431 432 } 433 xfs_trans_agblocks_delta(tp, nfree); 434 /* 435 * There are new blocks in the old last a.g. 436 */ 437 if (new) { 438 /* 439 * Change the agi length. 440 */ 441 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 442 if (error) { 443 goto error0; 444 } 445 ASSERT(bp); 446 agi = XFS_BUF_TO_AGI(bp); 447 be32_add_cpu(&agi->agi_length, new); 448 ASSERT(nagcount == oagcount || 449 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 450 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 451 /* 452 * Change agf length. 453 */ 454 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 455 if (error) { 456 goto error0; 457 } 458 ASSERT(bp); 459 agf = XFS_BUF_TO_AGF(bp); 460 be32_add_cpu(&agf->agf_length, new); 461 ASSERT(be32_to_cpu(agf->agf_length) == 462 be32_to_cpu(agi->agi_length)); 463 464 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 465 /* 466 * Free the new space. 467 */ 468 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 469 be32_to_cpu(agf->agf_length) - new), new); 470 if (error) { 471 goto error0; 472 } 473 } 474 475 /* 476 * Update changed superblock fields transactionally. These are not 477 * seen by the rest of the world until the transaction commit applies 478 * them atomically to the superblock. 479 */ 480 if (nagcount > oagcount) 481 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 482 if (nb > mp->m_sb.sb_dblocks) 483 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 484 nb - mp->m_sb.sb_dblocks); 485 if (nfree) 486 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 487 if (dpct) 488 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 489 xfs_trans_set_sync(tp); 490 error = xfs_trans_commit(tp); 491 if (error) 492 return error; 493 494 /* New allocation groups fully initialized, so update mount struct */ 495 if (nagimax) 496 mp->m_maxagi = nagimax; 497 if (mp->m_sb.sb_imax_pct) { 498 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 499 do_div(icount, 100); 500 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 501 } else 502 mp->m_maxicount = 0; 503 xfs_set_low_space_thresholds(mp); 504 505 /* update secondary superblocks. */ 506 for (agno = 1; agno < nagcount; agno++) { 507 error = 0; 508 /* 509 * new secondary superblocks need to be zeroed, not read from 510 * disk as the contents of the new area we are growing into is 511 * completely unknown. 512 */ 513 if (agno < oagcount) { 514 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 515 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 516 XFS_FSS_TO_BB(mp, 1), 0, &bp, 517 &xfs_sb_buf_ops); 518 } else { 519 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 520 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 521 XFS_FSS_TO_BB(mp, 1), 0); 522 if (bp) { 523 bp->b_ops = &xfs_sb_buf_ops; 524 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 525 } else 526 error = -ENOMEM; 527 } 528 529 /* 530 * If we get an error reading or writing alternate superblocks, 531 * continue. xfs_repair chooses the "best" superblock based 532 * on most matches; if we break early, we'll leave more 533 * superblocks un-updated than updated, and xfs_repair may 534 * pick them over the properly-updated primary. 535 */ 536 if (error) { 537 xfs_warn(mp, 538 "error %d reading secondary superblock for ag %d", 539 error, agno); 540 saved_error = error; 541 continue; 542 } 543 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); 544 545 error = xfs_bwrite(bp); 546 xfs_buf_relse(bp); 547 if (error) { 548 xfs_warn(mp, 549 "write error %d updating secondary superblock for ag %d", 550 error, agno); 551 saved_error = error; 552 continue; 553 } 554 } 555 return saved_error ? saved_error : error; 556 557 error0: 558 xfs_trans_cancel(tp); 559 return error; 560 } 561 562 static int 563 xfs_growfs_log_private( 564 xfs_mount_t *mp, /* mount point for filesystem */ 565 xfs_growfs_log_t *in) /* growfs log input struct */ 566 { 567 xfs_extlen_t nb; 568 569 nb = in->newblocks; 570 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 571 return -EINVAL; 572 if (nb == mp->m_sb.sb_logblocks && 573 in->isint == (mp->m_sb.sb_logstart != 0)) 574 return -EINVAL; 575 /* 576 * Moving the log is hard, need new interfaces to sync 577 * the log first, hold off all activity while moving it. 578 * Can have shorter or longer log in the same space, 579 * or transform internal to external log or vice versa. 580 */ 581 return -ENOSYS; 582 } 583 584 /* 585 * protected versions of growfs function acquire and release locks on the mount 586 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 587 * XFS_IOC_FSGROWFSRT 588 */ 589 590 591 int 592 xfs_growfs_data( 593 xfs_mount_t *mp, 594 xfs_growfs_data_t *in) 595 { 596 int error; 597 598 if (!capable(CAP_SYS_ADMIN)) 599 return -EPERM; 600 if (!mutex_trylock(&mp->m_growlock)) 601 return -EWOULDBLOCK; 602 error = xfs_growfs_data_private(mp, in); 603 /* 604 * Increment the generation unconditionally, the error could be from 605 * updating the secondary superblocks, in which case the new size 606 * is live already. 607 */ 608 mp->m_generation++; 609 mutex_unlock(&mp->m_growlock); 610 return error; 611 } 612 613 int 614 xfs_growfs_log( 615 xfs_mount_t *mp, 616 xfs_growfs_log_t *in) 617 { 618 int error; 619 620 if (!capable(CAP_SYS_ADMIN)) 621 return -EPERM; 622 if (!mutex_trylock(&mp->m_growlock)) 623 return -EWOULDBLOCK; 624 error = xfs_growfs_log_private(mp, in); 625 mutex_unlock(&mp->m_growlock); 626 return error; 627 } 628 629 /* 630 * exported through ioctl XFS_IOC_FSCOUNTS 631 */ 632 633 int 634 xfs_fs_counts( 635 xfs_mount_t *mp, 636 xfs_fsop_counts_t *cnt) 637 { 638 cnt->allocino = percpu_counter_read_positive(&mp->m_icount); 639 cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); 640 cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - 641 XFS_ALLOC_SET_ASIDE(mp); 642 643 spin_lock(&mp->m_sb_lock); 644 cnt->freertx = mp->m_sb.sb_frextents; 645 spin_unlock(&mp->m_sb_lock); 646 return 0; 647 } 648 649 /* 650 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 651 * 652 * xfs_reserve_blocks is called to set m_resblks 653 * in the in-core mount table. The number of unused reserved blocks 654 * is kept in m_resblks_avail. 655 * 656 * Reserve the requested number of blocks if available. Otherwise return 657 * as many as possible to satisfy the request. The actual number 658 * reserved are returned in outval 659 * 660 * A null inval pointer indicates that only the current reserved blocks 661 * available should be returned no settings are changed. 662 */ 663 664 int 665 xfs_reserve_blocks( 666 xfs_mount_t *mp, 667 __uint64_t *inval, 668 xfs_fsop_resblks_t *outval) 669 { 670 __int64_t lcounter, delta, fdblks_delta; 671 __uint64_t request; 672 673 /* If inval is null, report current values and return */ 674 if (inval == (__uint64_t *)NULL) { 675 if (!outval) 676 return -EINVAL; 677 outval->resblks = mp->m_resblks; 678 outval->resblks_avail = mp->m_resblks_avail; 679 return 0; 680 } 681 682 request = *inval; 683 684 /* 685 * With per-cpu counters, this becomes an interesting 686 * problem. we needto work out if we are freeing or allocation 687 * blocks first, then we can do the modification as necessary. 688 * 689 * We do this under the m_sb_lock so that if we are near 690 * ENOSPC, we will hold out any changes while we work out 691 * what to do. This means that the amount of free space can 692 * change while we do this, so we need to retry if we end up 693 * trying to reserve more space than is available. 694 */ 695 retry: 696 spin_lock(&mp->m_sb_lock); 697 698 /* 699 * If our previous reservation was larger than the current value, 700 * then move any unused blocks back to the free pool. 701 */ 702 fdblks_delta = 0; 703 if (mp->m_resblks > request) { 704 lcounter = mp->m_resblks_avail - request; 705 if (lcounter > 0) { /* release unused blocks */ 706 fdblks_delta = lcounter; 707 mp->m_resblks_avail -= lcounter; 708 } 709 mp->m_resblks = request; 710 } else { 711 __int64_t free; 712 713 free = percpu_counter_sum(&mp->m_fdblocks) - 714 XFS_ALLOC_SET_ASIDE(mp); 715 if (!free) 716 goto out; /* ENOSPC and fdblks_delta = 0 */ 717 718 delta = request - mp->m_resblks; 719 lcounter = free - delta; 720 if (lcounter < 0) { 721 /* We can't satisfy the request, just get what we can */ 722 mp->m_resblks += free; 723 mp->m_resblks_avail += free; 724 fdblks_delta = -free; 725 } else { 726 fdblks_delta = -delta; 727 mp->m_resblks = request; 728 mp->m_resblks_avail += delta; 729 } 730 } 731 out: 732 if (outval) { 733 outval->resblks = mp->m_resblks; 734 outval->resblks_avail = mp->m_resblks_avail; 735 } 736 spin_unlock(&mp->m_sb_lock); 737 738 if (fdblks_delta) { 739 /* 740 * If we are putting blocks back here, m_resblks_avail is 741 * already at its max so this will put it in the free pool. 742 * 743 * If we need space, we'll either succeed in getting it 744 * from the free block count or we'll get an enospc. If 745 * we get a ENOSPC, it means things changed while we were 746 * calculating fdblks_delta and so we should try again to 747 * see if there is anything left to reserve. 748 * 749 * Don't set the reserved flag here - we don't want to reserve 750 * the extra reserve blocks from the reserve..... 751 */ 752 int error; 753 error = xfs_mod_fdblocks(mp, fdblks_delta, 0); 754 if (error == -ENOSPC) 755 goto retry; 756 } 757 return 0; 758 } 759 760 int 761 xfs_fs_goingdown( 762 xfs_mount_t *mp, 763 __uint32_t inflags) 764 { 765 switch (inflags) { 766 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 767 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 768 769 if (sb && !IS_ERR(sb)) { 770 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 771 thaw_bdev(sb->s_bdev, sb); 772 } 773 774 break; 775 } 776 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 777 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 778 break; 779 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 780 xfs_force_shutdown(mp, 781 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 782 break; 783 default: 784 return -EINVAL; 785 } 786 787 return 0; 788 } 789 790 /* 791 * Force a shutdown of the filesystem instantly while keeping the filesystem 792 * consistent. We don't do an unmount here; just shutdown the shop, make sure 793 * that absolutely nothing persistent happens to this filesystem after this 794 * point. 795 */ 796 void 797 xfs_do_force_shutdown( 798 xfs_mount_t *mp, 799 int flags, 800 char *fname, 801 int lnnum) 802 { 803 int logerror; 804 805 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 806 807 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 808 xfs_notice(mp, 809 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 810 __func__, flags, lnnum, fname, __return_address); 811 } 812 /* 813 * No need to duplicate efforts. 814 */ 815 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 816 return; 817 818 /* 819 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 820 * queue up anybody new on the log reservations, and wakes up 821 * everybody who's sleeping on log reservations to tell them 822 * the bad news. 823 */ 824 if (xfs_log_force_umount(mp, logerror)) 825 return; 826 827 if (flags & SHUTDOWN_CORRUPT_INCORE) { 828 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 829 "Corruption of in-memory data detected. Shutting down filesystem"); 830 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 831 xfs_stack_trace(); 832 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 833 if (logerror) { 834 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 835 "Log I/O Error Detected. Shutting down filesystem"); 836 } else if (flags & SHUTDOWN_DEVICE_REQ) { 837 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 838 "All device paths lost. Shutting down filesystem"); 839 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 840 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 841 "I/O Error Detected. Shutting down filesystem"); 842 } 843 } 844 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 845 xfs_alert(mp, 846 "Please umount the filesystem and rectify the problem(s)"); 847 } 848 } 849