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_ag.h" 26 #include "xfs_mount.h" 27 #include "xfs_inode.h" 28 #include "xfs_trans.h" 29 #include "xfs_inode_item.h" 30 #include "xfs_error.h" 31 #include "xfs_btree.h" 32 #include "xfs_alloc_btree.h" 33 #include "xfs_alloc.h" 34 #include "xfs_ialloc.h" 35 #include "xfs_fsops.h" 36 #include "xfs_itable.h" 37 #include "xfs_trans_space.h" 38 #include "xfs_rtalloc.h" 39 #include "xfs_trace.h" 40 #include "xfs_log.h" 41 #include "xfs_dinode.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 = 78 (xfs_sb_version_hasattr(&mp->m_sb) ? 79 XFS_FSOP_GEOM_FLAGS_ATTR : 0) | 80 (xfs_sb_version_hasnlink(&mp->m_sb) ? 81 XFS_FSOP_GEOM_FLAGS_NLINK : 0) | 82 (xfs_sb_version_hasquota(&mp->m_sb) ? 83 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | 84 (xfs_sb_version_hasalign(&mp->m_sb) ? 85 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | 86 (xfs_sb_version_hasdalign(&mp->m_sb) ? 87 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | 88 (xfs_sb_version_hasshared(&mp->m_sb) ? 89 XFS_FSOP_GEOM_FLAGS_SHARED : 0) | 90 (xfs_sb_version_hasextflgbit(&mp->m_sb) ? 91 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | 92 (xfs_sb_version_hasdirv2(&mp->m_sb) ? 93 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) | 94 (xfs_sb_version_hassector(&mp->m_sb) ? 95 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | 96 (xfs_sb_version_hasasciici(&mp->m_sb) ? 97 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | 98 (xfs_sb_version_haslazysbcount(&mp->m_sb) ? 99 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | 100 (xfs_sb_version_hasattr2(&mp->m_sb) ? 101 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | 102 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? 103 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | 104 (xfs_sb_version_hascrc(&mp->m_sb) ? 105 XFS_FSOP_GEOM_FLAGS_V5SB : 0) | 106 (xfs_sb_version_hasftype(&mp->m_sb) ? 107 XFS_FSOP_GEOM_FLAGS_FTYPE : 0); 108 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? 109 mp->m_sb.sb_logsectsize : BBSIZE; 110 geo->rtsectsize = mp->m_sb.sb_blocksize; 111 geo->dirblocksize = mp->m_dirblksize; 112 } 113 if (new_version >= 4) { 114 geo->flags |= 115 (xfs_sb_version_haslogv2(&mp->m_sb) ? 116 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); 117 geo->logsunit = mp->m_sb.sb_logsunit; 118 } 119 return 0; 120 } 121 122 static struct xfs_buf * 123 xfs_growfs_get_hdr_buf( 124 struct xfs_mount *mp, 125 xfs_daddr_t blkno, 126 size_t numblks, 127 int flags, 128 const struct xfs_buf_ops *ops) 129 { 130 struct xfs_buf *bp; 131 132 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); 133 if (!bp) 134 return NULL; 135 136 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 137 bp->b_bn = blkno; 138 bp->b_maps[0].bm_bn = blkno; 139 bp->b_ops = ops; 140 141 return bp; 142 } 143 144 static int 145 xfs_growfs_data_private( 146 xfs_mount_t *mp, /* mount point for filesystem */ 147 xfs_growfs_data_t *in) /* growfs data input struct */ 148 { 149 xfs_agf_t *agf; 150 struct xfs_agfl *agfl; 151 xfs_agi_t *agi; 152 xfs_agnumber_t agno; 153 xfs_extlen_t agsize; 154 xfs_extlen_t tmpsize; 155 xfs_alloc_rec_t *arec; 156 xfs_buf_t *bp; 157 int bucket; 158 int dpct; 159 int error, saved_error = 0; 160 xfs_agnumber_t nagcount; 161 xfs_agnumber_t nagimax = 0; 162 xfs_rfsblock_t nb, nb_mod; 163 xfs_rfsblock_t new; 164 xfs_rfsblock_t nfree; 165 xfs_agnumber_t oagcount; 166 int pct; 167 xfs_trans_t *tp; 168 169 nb = in->newblocks; 170 pct = in->imaxpct; 171 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) 172 return XFS_ERROR(EINVAL); 173 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) 174 return error; 175 dpct = pct - mp->m_sb.sb_imax_pct; 176 bp = xfs_buf_read_uncached(mp->m_ddev_targp, 177 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), 178 XFS_FSS_TO_BB(mp, 1), 0, NULL); 179 if (!bp) 180 return EIO; 181 if (bp->b_error) { 182 error = bp->b_error; 183 xfs_buf_relse(bp); 184 return error; 185 } 186 xfs_buf_relse(bp); 187 188 new = nb; /* use new as a temporary here */ 189 nb_mod = do_div(new, mp->m_sb.sb_agblocks); 190 nagcount = new + (nb_mod != 0); 191 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { 192 nagcount--; 193 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; 194 if (nb < mp->m_sb.sb_dblocks) 195 return XFS_ERROR(EINVAL); 196 } 197 new = nb - mp->m_sb.sb_dblocks; 198 oagcount = mp->m_sb.sb_agcount; 199 200 /* allocate the new per-ag structures */ 201 if (nagcount > oagcount) { 202 error = xfs_initialize_perag(mp, nagcount, &nagimax); 203 if (error) 204 return error; 205 } 206 207 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); 208 tp->t_flags |= XFS_TRANS_RESERVE; 209 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata, 210 XFS_GROWFS_SPACE_RES(mp), 0); 211 if (error) { 212 xfs_trans_cancel(tp, 0); 213 return error; 214 } 215 216 /* 217 * Write new AG headers to disk. Non-transactional, but written 218 * synchronously so they are completed prior to the growfs transaction 219 * being logged. 220 */ 221 nfree = 0; 222 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { 223 __be32 *agfl_bno; 224 225 /* 226 * AG freespace header block 227 */ 228 bp = xfs_growfs_get_hdr_buf(mp, 229 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), 230 XFS_FSS_TO_BB(mp, 1), 0, 231 &xfs_agf_buf_ops); 232 if (!bp) { 233 error = ENOMEM; 234 goto error0; 235 } 236 237 agf = XFS_BUF_TO_AGF(bp); 238 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); 239 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); 240 agf->agf_seqno = cpu_to_be32(agno); 241 if (agno == nagcount - 1) 242 agsize = 243 nb - 244 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); 245 else 246 agsize = mp->m_sb.sb_agblocks; 247 agf->agf_length = cpu_to_be32(agsize); 248 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); 249 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); 250 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); 251 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); 252 agf->agf_flfirst = 0; 253 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); 254 agf->agf_flcount = 0; 255 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); 256 agf->agf_freeblks = cpu_to_be32(tmpsize); 257 agf->agf_longest = cpu_to_be32(tmpsize); 258 if (xfs_sb_version_hascrc(&mp->m_sb)) 259 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid); 260 261 error = xfs_bwrite(bp); 262 xfs_buf_relse(bp); 263 if (error) 264 goto error0; 265 266 /* 267 * AG freelist header block 268 */ 269 bp = xfs_growfs_get_hdr_buf(mp, 270 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), 271 XFS_FSS_TO_BB(mp, 1), 0, 272 &xfs_agfl_buf_ops); 273 if (!bp) { 274 error = ENOMEM; 275 goto error0; 276 } 277 278 agfl = XFS_BUF_TO_AGFL(bp); 279 if (xfs_sb_version_hascrc(&mp->m_sb)) { 280 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); 281 agfl->agfl_seqno = cpu_to_be32(agno); 282 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid); 283 } 284 285 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); 286 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) 287 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); 288 289 error = xfs_bwrite(bp); 290 xfs_buf_relse(bp); 291 if (error) 292 goto error0; 293 294 /* 295 * AG inode header block 296 */ 297 bp = xfs_growfs_get_hdr_buf(mp, 298 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), 299 XFS_FSS_TO_BB(mp, 1), 0, 300 &xfs_agi_buf_ops); 301 if (!bp) { 302 error = ENOMEM; 303 goto error0; 304 } 305 306 agi = XFS_BUF_TO_AGI(bp); 307 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); 308 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); 309 agi->agi_seqno = cpu_to_be32(agno); 310 agi->agi_length = cpu_to_be32(agsize); 311 agi->agi_count = 0; 312 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); 313 agi->agi_level = cpu_to_be32(1); 314 agi->agi_freecount = 0; 315 agi->agi_newino = cpu_to_be32(NULLAGINO); 316 agi->agi_dirino = cpu_to_be32(NULLAGINO); 317 if (xfs_sb_version_hascrc(&mp->m_sb)) 318 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid); 319 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) 320 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); 321 322 error = xfs_bwrite(bp); 323 xfs_buf_relse(bp); 324 if (error) 325 goto error0; 326 327 /* 328 * BNO btree root block 329 */ 330 bp = xfs_growfs_get_hdr_buf(mp, 331 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), 332 BTOBB(mp->m_sb.sb_blocksize), 0, 333 &xfs_allocbt_buf_ops); 334 335 if (!bp) { 336 error = ENOMEM; 337 goto error0; 338 } 339 340 if (xfs_sb_version_hascrc(&mp->m_sb)) 341 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, 342 agno, XFS_BTREE_CRC_BLOCKS); 343 else 344 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, 345 agno, 0); 346 347 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 348 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 349 arec->ar_blockcount = cpu_to_be32( 350 agsize - be32_to_cpu(arec->ar_startblock)); 351 352 error = xfs_bwrite(bp); 353 xfs_buf_relse(bp); 354 if (error) 355 goto error0; 356 357 /* 358 * CNT btree root block 359 */ 360 bp = xfs_growfs_get_hdr_buf(mp, 361 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), 362 BTOBB(mp->m_sb.sb_blocksize), 0, 363 &xfs_allocbt_buf_ops); 364 if (!bp) { 365 error = ENOMEM; 366 goto error0; 367 } 368 369 if (xfs_sb_version_hascrc(&mp->m_sb)) 370 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, 371 agno, XFS_BTREE_CRC_BLOCKS); 372 else 373 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, 374 agno, 0); 375 376 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); 377 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); 378 arec->ar_blockcount = cpu_to_be32( 379 agsize - be32_to_cpu(arec->ar_startblock)); 380 nfree += be32_to_cpu(arec->ar_blockcount); 381 382 error = xfs_bwrite(bp); 383 xfs_buf_relse(bp); 384 if (error) 385 goto error0; 386 387 /* 388 * INO btree root block 389 */ 390 bp = xfs_growfs_get_hdr_buf(mp, 391 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), 392 BTOBB(mp->m_sb.sb_blocksize), 0, 393 &xfs_inobt_buf_ops); 394 if (!bp) { 395 error = ENOMEM; 396 goto error0; 397 } 398 399 if (xfs_sb_version_hascrc(&mp->m_sb)) 400 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, 401 agno, XFS_BTREE_CRC_BLOCKS); 402 else 403 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, 404 agno, 0); 405 406 error = xfs_bwrite(bp); 407 xfs_buf_relse(bp); 408 if (error) 409 goto error0; 410 } 411 xfs_trans_agblocks_delta(tp, nfree); 412 /* 413 * There are new blocks in the old last a.g. 414 */ 415 if (new) { 416 /* 417 * Change the agi length. 418 */ 419 error = xfs_ialloc_read_agi(mp, tp, agno, &bp); 420 if (error) { 421 goto error0; 422 } 423 ASSERT(bp); 424 agi = XFS_BUF_TO_AGI(bp); 425 be32_add_cpu(&agi->agi_length, new); 426 ASSERT(nagcount == oagcount || 427 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); 428 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); 429 /* 430 * Change agf length. 431 */ 432 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); 433 if (error) { 434 goto error0; 435 } 436 ASSERT(bp); 437 agf = XFS_BUF_TO_AGF(bp); 438 be32_add_cpu(&agf->agf_length, new); 439 ASSERT(be32_to_cpu(agf->agf_length) == 440 be32_to_cpu(agi->agi_length)); 441 442 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); 443 /* 444 * Free the new space. 445 */ 446 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, 447 be32_to_cpu(agf->agf_length) - new), new); 448 if (error) { 449 goto error0; 450 } 451 } 452 453 /* 454 * Update changed superblock fields transactionally. These are not 455 * seen by the rest of the world until the transaction commit applies 456 * them atomically to the superblock. 457 */ 458 if (nagcount > oagcount) 459 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); 460 if (nb > mp->m_sb.sb_dblocks) 461 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, 462 nb - mp->m_sb.sb_dblocks); 463 if (nfree) 464 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); 465 if (dpct) 466 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); 467 error = xfs_trans_commit(tp, 0); 468 if (error) 469 return error; 470 471 /* New allocation groups fully initialized, so update mount struct */ 472 if (nagimax) 473 mp->m_maxagi = nagimax; 474 if (mp->m_sb.sb_imax_pct) { 475 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; 476 do_div(icount, 100); 477 mp->m_maxicount = icount << mp->m_sb.sb_inopblog; 478 } else 479 mp->m_maxicount = 0; 480 xfs_set_low_space_thresholds(mp); 481 482 /* update secondary superblocks. */ 483 for (agno = 1; agno < nagcount; agno++) { 484 error = 0; 485 /* 486 * new secondary superblocks need to be zeroed, not read from 487 * disk as the contents of the new area we are growing into is 488 * completely unknown. 489 */ 490 if (agno < oagcount) { 491 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, 492 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 493 XFS_FSS_TO_BB(mp, 1), 0, &bp, 494 &xfs_sb_buf_ops); 495 } else { 496 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, 497 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), 498 XFS_FSS_TO_BB(mp, 1), 0); 499 if (bp) { 500 bp->b_ops = &xfs_sb_buf_ops; 501 xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); 502 } else 503 error = ENOMEM; 504 } 505 506 /* 507 * If we get an error reading or writing alternate superblocks, 508 * continue. xfs_repair chooses the "best" superblock based 509 * on most matches; if we break early, we'll leave more 510 * superblocks un-updated than updated, and xfs_repair may 511 * pick them over the properly-updated primary. 512 */ 513 if (error) { 514 xfs_warn(mp, 515 "error %d reading secondary superblock for ag %d", 516 error, agno); 517 saved_error = error; 518 continue; 519 } 520 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS); 521 522 error = xfs_bwrite(bp); 523 xfs_buf_relse(bp); 524 if (error) { 525 xfs_warn(mp, 526 "write error %d updating secondary superblock for ag %d", 527 error, agno); 528 saved_error = error; 529 continue; 530 } 531 } 532 return saved_error ? saved_error : error; 533 534 error0: 535 xfs_trans_cancel(tp, XFS_TRANS_ABORT); 536 return error; 537 } 538 539 static int 540 xfs_growfs_log_private( 541 xfs_mount_t *mp, /* mount point for filesystem */ 542 xfs_growfs_log_t *in) /* growfs log input struct */ 543 { 544 xfs_extlen_t nb; 545 546 nb = in->newblocks; 547 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) 548 return XFS_ERROR(EINVAL); 549 if (nb == mp->m_sb.sb_logblocks && 550 in->isint == (mp->m_sb.sb_logstart != 0)) 551 return XFS_ERROR(EINVAL); 552 /* 553 * Moving the log is hard, need new interfaces to sync 554 * the log first, hold off all activity while moving it. 555 * Can have shorter or longer log in the same space, 556 * or transform internal to external log or vice versa. 557 */ 558 return XFS_ERROR(ENOSYS); 559 } 560 561 /* 562 * protected versions of growfs function acquire and release locks on the mount 563 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, 564 * XFS_IOC_FSGROWFSRT 565 */ 566 567 568 int 569 xfs_growfs_data( 570 xfs_mount_t *mp, 571 xfs_growfs_data_t *in) 572 { 573 int error; 574 575 if (!capable(CAP_SYS_ADMIN)) 576 return XFS_ERROR(EPERM); 577 if (!mutex_trylock(&mp->m_growlock)) 578 return XFS_ERROR(EWOULDBLOCK); 579 error = xfs_growfs_data_private(mp, in); 580 mutex_unlock(&mp->m_growlock); 581 return error; 582 } 583 584 int 585 xfs_growfs_log( 586 xfs_mount_t *mp, 587 xfs_growfs_log_t *in) 588 { 589 int error; 590 591 if (!capable(CAP_SYS_ADMIN)) 592 return XFS_ERROR(EPERM); 593 if (!mutex_trylock(&mp->m_growlock)) 594 return XFS_ERROR(EWOULDBLOCK); 595 error = xfs_growfs_log_private(mp, in); 596 mutex_unlock(&mp->m_growlock); 597 return error; 598 } 599 600 /* 601 * exported through ioctl XFS_IOC_FSCOUNTS 602 */ 603 604 int 605 xfs_fs_counts( 606 xfs_mount_t *mp, 607 xfs_fsop_counts_t *cnt) 608 { 609 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 610 spin_lock(&mp->m_sb_lock); 611 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 612 cnt->freertx = mp->m_sb.sb_frextents; 613 cnt->freeino = mp->m_sb.sb_ifree; 614 cnt->allocino = mp->m_sb.sb_icount; 615 spin_unlock(&mp->m_sb_lock); 616 return 0; 617 } 618 619 /* 620 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS 621 * 622 * xfs_reserve_blocks is called to set m_resblks 623 * in the in-core mount table. The number of unused reserved blocks 624 * is kept in m_resblks_avail. 625 * 626 * Reserve the requested number of blocks if available. Otherwise return 627 * as many as possible to satisfy the request. The actual number 628 * reserved are returned in outval 629 * 630 * A null inval pointer indicates that only the current reserved blocks 631 * available should be returned no settings are changed. 632 */ 633 634 int 635 xfs_reserve_blocks( 636 xfs_mount_t *mp, 637 __uint64_t *inval, 638 xfs_fsop_resblks_t *outval) 639 { 640 __int64_t lcounter, delta, fdblks_delta; 641 __uint64_t request; 642 643 /* If inval is null, report current values and return */ 644 if (inval == (__uint64_t *)NULL) { 645 if (!outval) 646 return EINVAL; 647 outval->resblks = mp->m_resblks; 648 outval->resblks_avail = mp->m_resblks_avail; 649 return 0; 650 } 651 652 request = *inval; 653 654 /* 655 * With per-cpu counters, this becomes an interesting 656 * problem. we needto work out if we are freeing or allocation 657 * blocks first, then we can do the modification as necessary. 658 * 659 * We do this under the m_sb_lock so that if we are near 660 * ENOSPC, we will hold out any changes while we work out 661 * what to do. This means that the amount of free space can 662 * change while we do this, so we need to retry if we end up 663 * trying to reserve more space than is available. 664 * 665 * We also use the xfs_mod_incore_sb() interface so that we 666 * don't have to care about whether per cpu counter are 667 * enabled, disabled or even compiled in.... 668 */ 669 retry: 670 spin_lock(&mp->m_sb_lock); 671 xfs_icsb_sync_counters_locked(mp, 0); 672 673 /* 674 * If our previous reservation was larger than the current value, 675 * then move any unused blocks back to the free pool. 676 */ 677 fdblks_delta = 0; 678 if (mp->m_resblks > request) { 679 lcounter = mp->m_resblks_avail - request; 680 if (lcounter > 0) { /* release unused blocks */ 681 fdblks_delta = lcounter; 682 mp->m_resblks_avail -= lcounter; 683 } 684 mp->m_resblks = request; 685 } else { 686 __int64_t free; 687 688 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 689 if (!free) 690 goto out; /* ENOSPC and fdblks_delta = 0 */ 691 692 delta = request - mp->m_resblks; 693 lcounter = free - delta; 694 if (lcounter < 0) { 695 /* We can't satisfy the request, just get what we can */ 696 mp->m_resblks += free; 697 mp->m_resblks_avail += free; 698 fdblks_delta = -free; 699 } else { 700 fdblks_delta = -delta; 701 mp->m_resblks = request; 702 mp->m_resblks_avail += delta; 703 } 704 } 705 out: 706 if (outval) { 707 outval->resblks = mp->m_resblks; 708 outval->resblks_avail = mp->m_resblks_avail; 709 } 710 spin_unlock(&mp->m_sb_lock); 711 712 if (fdblks_delta) { 713 /* 714 * If we are putting blocks back here, m_resblks_avail is 715 * already at its max so this will put it in the free pool. 716 * 717 * If we need space, we'll either succeed in getting it 718 * from the free block count or we'll get an enospc. If 719 * we get a ENOSPC, it means things changed while we were 720 * calculating fdblks_delta and so we should try again to 721 * see if there is anything left to reserve. 722 * 723 * Don't set the reserved flag here - we don't want to reserve 724 * the extra reserve blocks from the reserve..... 725 */ 726 int error; 727 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, 728 fdblks_delta, 0); 729 if (error == ENOSPC) 730 goto retry; 731 } 732 return 0; 733 } 734 735 /* 736 * Dump a transaction into the log that contains no real change. This is needed 737 * to be able to make the log dirty or stamp the current tail LSN into the log 738 * during the covering operation. 739 * 740 * We cannot use an inode here for this - that will push dirty state back up 741 * into the VFS and then periodic inode flushing will prevent log covering from 742 * making progress. Hence we log a field in the superblock instead and use a 743 * synchronous transaction to ensure the superblock is immediately unpinned 744 * and can be written back. 745 */ 746 int 747 xfs_fs_log_dummy( 748 xfs_mount_t *mp) 749 { 750 xfs_trans_t *tp; 751 int error; 752 753 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP); 754 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0); 755 if (error) { 756 xfs_trans_cancel(tp, 0); 757 return error; 758 } 759 760 /* log the UUID because it is an unchanging field */ 761 xfs_mod_sb(tp, XFS_SB_UUID); 762 xfs_trans_set_sync(tp); 763 return xfs_trans_commit(tp, 0); 764 } 765 766 int 767 xfs_fs_goingdown( 768 xfs_mount_t *mp, 769 __uint32_t inflags) 770 { 771 switch (inflags) { 772 case XFS_FSOP_GOING_FLAGS_DEFAULT: { 773 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); 774 775 if (sb && !IS_ERR(sb)) { 776 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 777 thaw_bdev(sb->s_bdev, sb); 778 } 779 780 break; 781 } 782 case XFS_FSOP_GOING_FLAGS_LOGFLUSH: 783 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); 784 break; 785 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: 786 xfs_force_shutdown(mp, 787 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); 788 break; 789 default: 790 return XFS_ERROR(EINVAL); 791 } 792 793 return 0; 794 } 795 796 /* 797 * Force a shutdown of the filesystem instantly while keeping the filesystem 798 * consistent. We don't do an unmount here; just shutdown the shop, make sure 799 * that absolutely nothing persistent happens to this filesystem after this 800 * point. 801 */ 802 void 803 xfs_do_force_shutdown( 804 xfs_mount_t *mp, 805 int flags, 806 char *fname, 807 int lnnum) 808 { 809 int logerror; 810 811 logerror = flags & SHUTDOWN_LOG_IO_ERROR; 812 813 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 814 xfs_notice(mp, 815 "%s(0x%x) called from line %d of file %s. Return address = 0x%p", 816 __func__, flags, lnnum, fname, __return_address); 817 } 818 /* 819 * No need to duplicate efforts. 820 */ 821 if (XFS_FORCED_SHUTDOWN(mp) && !logerror) 822 return; 823 824 /* 825 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't 826 * queue up anybody new on the log reservations, and wakes up 827 * everybody who's sleeping on log reservations to tell them 828 * the bad news. 829 */ 830 if (xfs_log_force_umount(mp, logerror)) 831 return; 832 833 if (flags & SHUTDOWN_CORRUPT_INCORE) { 834 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, 835 "Corruption of in-memory data detected. Shutting down filesystem"); 836 if (XFS_ERRLEVEL_HIGH <= xfs_error_level) 837 xfs_stack_trace(); 838 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 839 if (logerror) { 840 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, 841 "Log I/O Error Detected. Shutting down filesystem"); 842 } else if (flags & SHUTDOWN_DEVICE_REQ) { 843 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 844 "All device paths lost. Shutting down filesystem"); 845 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { 846 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, 847 "I/O Error Detected. Shutting down filesystem"); 848 } 849 } 850 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { 851 xfs_alert(mp, 852 "Please umount the filesystem and rectify the problem(s)"); 853 } 854 } 855