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_types.h" 21 #include "xfs_bit.h" 22 #include "xfs_log.h" 23 #include "xfs_inum.h" 24 #include "xfs_trans.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_dir2.h" 28 #include "xfs_dmapi.h" 29 #include "xfs_mount.h" 30 #include "xfs_bmap_btree.h" 31 #include "xfs_alloc_btree.h" 32 #include "xfs_ialloc_btree.h" 33 #include "xfs_dir2_sf.h" 34 #include "xfs_attr_sf.h" 35 #include "xfs_dinode.h" 36 #include "xfs_inode.h" 37 #include "xfs_btree.h" 38 #include "xfs_ialloc.h" 39 #include "xfs_alloc.h" 40 #include "xfs_rtalloc.h" 41 #include "xfs_bmap.h" 42 #include "xfs_error.h" 43 #include "xfs_rw.h" 44 #include "xfs_quota.h" 45 #include "xfs_fsops.h" 46 47 STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t); 48 STATIC int xfs_uuid_mount(xfs_mount_t *); 49 STATIC void xfs_uuid_unmount(xfs_mount_t *mp); 50 STATIC void xfs_unmountfs_wait(xfs_mount_t *); 51 52 53 #ifdef HAVE_PERCPU_SB 54 STATIC void xfs_icsb_destroy_counters(xfs_mount_t *); 55 STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, int); 56 STATIC void xfs_icsb_sync_counters(xfs_mount_t *); 57 STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t, 58 int, int); 59 STATIC int xfs_icsb_modify_counters_locked(xfs_mount_t *, xfs_sb_field_t, 60 int, int); 61 STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); 62 63 #else 64 65 #define xfs_icsb_destroy_counters(mp) do { } while (0) 66 #define xfs_icsb_balance_counter(mp, a, b) do { } while (0) 67 #define xfs_icsb_sync_counters(mp) do { } while (0) 68 #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0) 69 #define xfs_icsb_modify_counters_locked(mp, a, b, c) do { } while (0) 70 71 #endif 72 73 static const struct { 74 short offset; 75 short type; /* 0 = integer 76 * 1 = binary / string (no translation) 77 */ 78 } xfs_sb_info[] = { 79 { offsetof(xfs_sb_t, sb_magicnum), 0 }, 80 { offsetof(xfs_sb_t, sb_blocksize), 0 }, 81 { offsetof(xfs_sb_t, sb_dblocks), 0 }, 82 { offsetof(xfs_sb_t, sb_rblocks), 0 }, 83 { offsetof(xfs_sb_t, sb_rextents), 0 }, 84 { offsetof(xfs_sb_t, sb_uuid), 1 }, 85 { offsetof(xfs_sb_t, sb_logstart), 0 }, 86 { offsetof(xfs_sb_t, sb_rootino), 0 }, 87 { offsetof(xfs_sb_t, sb_rbmino), 0 }, 88 { offsetof(xfs_sb_t, sb_rsumino), 0 }, 89 { offsetof(xfs_sb_t, sb_rextsize), 0 }, 90 { offsetof(xfs_sb_t, sb_agblocks), 0 }, 91 { offsetof(xfs_sb_t, sb_agcount), 0 }, 92 { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, 93 { offsetof(xfs_sb_t, sb_logblocks), 0 }, 94 { offsetof(xfs_sb_t, sb_versionnum), 0 }, 95 { offsetof(xfs_sb_t, sb_sectsize), 0 }, 96 { offsetof(xfs_sb_t, sb_inodesize), 0 }, 97 { offsetof(xfs_sb_t, sb_inopblock), 0 }, 98 { offsetof(xfs_sb_t, sb_fname[0]), 1 }, 99 { offsetof(xfs_sb_t, sb_blocklog), 0 }, 100 { offsetof(xfs_sb_t, sb_sectlog), 0 }, 101 { offsetof(xfs_sb_t, sb_inodelog), 0 }, 102 { offsetof(xfs_sb_t, sb_inopblog), 0 }, 103 { offsetof(xfs_sb_t, sb_agblklog), 0 }, 104 { offsetof(xfs_sb_t, sb_rextslog), 0 }, 105 { offsetof(xfs_sb_t, sb_inprogress), 0 }, 106 { offsetof(xfs_sb_t, sb_imax_pct), 0 }, 107 { offsetof(xfs_sb_t, sb_icount), 0 }, 108 { offsetof(xfs_sb_t, sb_ifree), 0 }, 109 { offsetof(xfs_sb_t, sb_fdblocks), 0 }, 110 { offsetof(xfs_sb_t, sb_frextents), 0 }, 111 { offsetof(xfs_sb_t, sb_uquotino), 0 }, 112 { offsetof(xfs_sb_t, sb_gquotino), 0 }, 113 { offsetof(xfs_sb_t, sb_qflags), 0 }, 114 { offsetof(xfs_sb_t, sb_flags), 0 }, 115 { offsetof(xfs_sb_t, sb_shared_vn), 0 }, 116 { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, 117 { offsetof(xfs_sb_t, sb_unit), 0 }, 118 { offsetof(xfs_sb_t, sb_width), 0 }, 119 { offsetof(xfs_sb_t, sb_dirblklog), 0 }, 120 { offsetof(xfs_sb_t, sb_logsectlog), 0 }, 121 { offsetof(xfs_sb_t, sb_logsectsize),0 }, 122 { offsetof(xfs_sb_t, sb_logsunit), 0 }, 123 { offsetof(xfs_sb_t, sb_features2), 0 }, 124 { sizeof(xfs_sb_t), 0 } 125 }; 126 127 /* 128 * Return a pointer to an initialized xfs_mount structure. 129 */ 130 xfs_mount_t * 131 xfs_mount_init(void) 132 { 133 xfs_mount_t *mp; 134 135 mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP); 136 137 if (xfs_icsb_init_counters(mp)) { 138 mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB; 139 } 140 141 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail"); 142 spinlock_init(&mp->m_sb_lock, "xfs_sb"); 143 mutex_init(&mp->m_ilock); 144 initnsema(&mp->m_growlock, 1, "xfs_grow"); 145 /* 146 * Initialize the AIL. 147 */ 148 xfs_trans_ail_init(mp); 149 150 atomic_set(&mp->m_active_trans, 0); 151 152 return mp; 153 } 154 155 /* 156 * Free up the resources associated with a mount structure. Assume that 157 * the structure was initially zeroed, so we can tell which fields got 158 * initialized. 159 */ 160 void 161 xfs_mount_free( 162 xfs_mount_t *mp, 163 int remove_bhv) 164 { 165 if (mp->m_ihash) 166 xfs_ihash_free(mp); 167 if (mp->m_chash) 168 xfs_chash_free(mp); 169 170 if (mp->m_perag) { 171 int agno; 172 173 for (agno = 0; agno < mp->m_maxagi; agno++) 174 if (mp->m_perag[agno].pagb_list) 175 kmem_free(mp->m_perag[agno].pagb_list, 176 sizeof(xfs_perag_busy_t) * 177 XFS_PAGB_NUM_SLOTS); 178 kmem_free(mp->m_perag, 179 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); 180 } 181 182 AIL_LOCK_DESTROY(&mp->m_ail_lock); 183 spinlock_destroy(&mp->m_sb_lock); 184 mutex_destroy(&mp->m_ilock); 185 freesema(&mp->m_growlock); 186 if (mp->m_quotainfo) 187 XFS_QM_DONE(mp); 188 189 if (mp->m_fsname != NULL) 190 kmem_free(mp->m_fsname, mp->m_fsname_len); 191 if (mp->m_rtname != NULL) 192 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); 193 if (mp->m_logname != NULL) 194 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); 195 196 if (remove_bhv) { 197 struct bhv_vfs *vfsp = XFS_MTOVFS(mp); 198 199 bhv_remove_all_vfsops(vfsp, 0); 200 VFS_REMOVEBHV(vfsp, &mp->m_bhv); 201 } 202 203 xfs_icsb_destroy_counters(mp); 204 kmem_free(mp, sizeof(xfs_mount_t)); 205 } 206 207 208 /* 209 * Check the validity of the SB found. 210 */ 211 STATIC int 212 xfs_mount_validate_sb( 213 xfs_mount_t *mp, 214 xfs_sb_t *sbp, 215 int flags) 216 { 217 /* 218 * If the log device and data device have the 219 * same device number, the log is internal. 220 * Consequently, the sb_logstart should be non-zero. If 221 * we have a zero sb_logstart in this case, we may be trying to mount 222 * a volume filesystem in a non-volume manner. 223 */ 224 if (sbp->sb_magicnum != XFS_SB_MAGIC) { 225 xfs_fs_mount_cmn_err(flags, "bad magic number"); 226 return XFS_ERROR(EWRONGFS); 227 } 228 229 if (!XFS_SB_GOOD_VERSION(sbp)) { 230 xfs_fs_mount_cmn_err(flags, "bad version"); 231 return XFS_ERROR(EWRONGFS); 232 } 233 234 if (unlikely( 235 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { 236 xfs_fs_mount_cmn_err(flags, 237 "filesystem is marked as having an external log; " 238 "specify logdev on the\nmount command line."); 239 return XFS_ERROR(EINVAL); 240 } 241 242 if (unlikely( 243 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { 244 xfs_fs_mount_cmn_err(flags, 245 "filesystem is marked as having an internal log; " 246 "do not specify logdev on\nthe mount command line."); 247 return XFS_ERROR(EINVAL); 248 } 249 250 /* 251 * More sanity checking. These were stolen directly from 252 * xfs_repair. 253 */ 254 if (unlikely( 255 sbp->sb_agcount <= 0 || 256 sbp->sb_sectsize < XFS_MIN_SECTORSIZE || 257 sbp->sb_sectsize > XFS_MAX_SECTORSIZE || 258 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || 259 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || 260 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || 261 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || 262 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || 263 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || 264 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || 265 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || 266 sbp->sb_inodelog < XFS_DINODE_MIN_LOG || 267 sbp->sb_inodelog > XFS_DINODE_MAX_LOG || 268 (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || 269 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || 270 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || 271 (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { 272 xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); 273 return XFS_ERROR(EFSCORRUPTED); 274 } 275 276 /* 277 * Sanity check AG count, size fields against data size field 278 */ 279 if (unlikely( 280 sbp->sb_dblocks == 0 || 281 sbp->sb_dblocks > 282 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || 283 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * 284 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { 285 xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); 286 return XFS_ERROR(EFSCORRUPTED); 287 } 288 289 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); 290 ASSERT(sbp->sb_blocklog >= BBSHIFT); 291 292 #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ 293 if (unlikely( 294 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX || 295 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) { 296 #else /* Limited by UINT_MAX of sectors */ 297 if (unlikely( 298 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX || 299 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) { 300 #endif 301 xfs_fs_mount_cmn_err(flags, 302 "file system too large to be mounted on this system."); 303 return XFS_ERROR(E2BIG); 304 } 305 306 if (unlikely(sbp->sb_inprogress)) { 307 xfs_fs_mount_cmn_err(flags, "file system busy"); 308 return XFS_ERROR(EFSCORRUPTED); 309 } 310 311 /* 312 * Version 1 directory format has never worked on Linux. 313 */ 314 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) { 315 xfs_fs_mount_cmn_err(flags, 316 "file system using version 1 directory format"); 317 return XFS_ERROR(ENOSYS); 318 } 319 320 /* 321 * Until this is fixed only page-sized or smaller data blocks work. 322 */ 323 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { 324 xfs_fs_mount_cmn_err(flags, 325 "file system with blocksize %d bytes", 326 sbp->sb_blocksize); 327 xfs_fs_mount_cmn_err(flags, 328 "only pagesize (%ld) or less will currently work.", 329 PAGE_SIZE); 330 return XFS_ERROR(ENOSYS); 331 } 332 333 return 0; 334 } 335 336 xfs_agnumber_t 337 xfs_initialize_perag( 338 bhv_vfs_t *vfs, 339 xfs_mount_t *mp, 340 xfs_agnumber_t agcount) 341 { 342 xfs_agnumber_t index, max_metadata; 343 xfs_perag_t *pag; 344 xfs_agino_t agino; 345 xfs_ino_t ino; 346 xfs_sb_t *sbp = &mp->m_sb; 347 xfs_ino_t max_inum = XFS_MAXINUMBER_32; 348 349 /* Check to see if the filesystem can overflow 32 bit inodes */ 350 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); 351 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); 352 353 /* Clear the mount flag if no inode can overflow 32 bits 354 * on this filesystem, or if specifically requested.. 355 */ 356 if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) { 357 mp->m_flags |= XFS_MOUNT_32BITINODES; 358 } else { 359 mp->m_flags &= ~XFS_MOUNT_32BITINODES; 360 } 361 362 /* If we can overflow then setup the ag headers accordingly */ 363 if (mp->m_flags & XFS_MOUNT_32BITINODES) { 364 /* Calculate how much should be reserved for inodes to 365 * meet the max inode percentage. 366 */ 367 if (mp->m_maxicount) { 368 __uint64_t icount; 369 370 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 371 do_div(icount, 100); 372 icount += sbp->sb_agblocks - 1; 373 do_div(icount, sbp->sb_agblocks); 374 max_metadata = icount; 375 } else { 376 max_metadata = agcount; 377 } 378 for (index = 0; index < agcount; index++) { 379 ino = XFS_AGINO_TO_INO(mp, index, agino); 380 if (ino > max_inum) { 381 index++; 382 break; 383 } 384 385 /* This ag is preferred for inodes */ 386 pag = &mp->m_perag[index]; 387 pag->pagi_inodeok = 1; 388 if (index < max_metadata) 389 pag->pagf_metadata = 1; 390 } 391 } else { 392 /* Setup default behavior for smaller filesystems */ 393 for (index = 0; index < agcount; index++) { 394 pag = &mp->m_perag[index]; 395 pag->pagi_inodeok = 1; 396 } 397 } 398 return index; 399 } 400 401 /* 402 * xfs_xlatesb 403 * 404 * data - on disk version of sb 405 * sb - a superblock 406 * dir - conversion direction: <0 - convert sb to buf 407 * >0 - convert buf to sb 408 * fields - which fields to copy (bitmask) 409 */ 410 void 411 xfs_xlatesb( 412 void *data, 413 xfs_sb_t *sb, 414 int dir, 415 __int64_t fields) 416 { 417 xfs_caddr_t buf_ptr; 418 xfs_caddr_t mem_ptr; 419 xfs_sb_field_t f; 420 int first; 421 int size; 422 423 ASSERT(dir); 424 ASSERT(fields); 425 426 if (!fields) 427 return; 428 429 buf_ptr = (xfs_caddr_t)data; 430 mem_ptr = (xfs_caddr_t)sb; 431 432 while (fields) { 433 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); 434 first = xfs_sb_info[f].offset; 435 size = xfs_sb_info[f + 1].offset - first; 436 437 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); 438 439 if (size == 1 || xfs_sb_info[f].type == 1) { 440 if (dir > 0) { 441 memcpy(mem_ptr + first, buf_ptr + first, size); 442 } else { 443 memcpy(buf_ptr + first, mem_ptr + first, size); 444 } 445 } else { 446 switch (size) { 447 case 2: 448 INT_XLATE(*(__uint16_t*)(buf_ptr+first), 449 *(__uint16_t*)(mem_ptr+first), 450 dir, ARCH_CONVERT); 451 break; 452 case 4: 453 INT_XLATE(*(__uint32_t*)(buf_ptr+first), 454 *(__uint32_t*)(mem_ptr+first), 455 dir, ARCH_CONVERT); 456 break; 457 case 8: 458 INT_XLATE(*(__uint64_t*)(buf_ptr+first), 459 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT); 460 break; 461 default: 462 ASSERT(0); 463 } 464 } 465 466 fields &= ~(1LL << f); 467 } 468 } 469 470 /* 471 * xfs_readsb 472 * 473 * Does the initial read of the superblock. 474 */ 475 int 476 xfs_readsb(xfs_mount_t *mp, int flags) 477 { 478 unsigned int sector_size; 479 unsigned int extra_flags; 480 xfs_buf_t *bp; 481 xfs_sb_t *sbp; 482 int error; 483 484 ASSERT(mp->m_sb_bp == NULL); 485 ASSERT(mp->m_ddev_targp != NULL); 486 487 /* 488 * Allocate a (locked) buffer to hold the superblock. 489 * This will be kept around at all times to optimize 490 * access to the superblock. 491 */ 492 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); 493 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; 494 495 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, 496 BTOBB(sector_size), extra_flags); 497 if (!bp || XFS_BUF_ISERROR(bp)) { 498 xfs_fs_mount_cmn_err(flags, "SB read failed"); 499 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; 500 goto fail; 501 } 502 ASSERT(XFS_BUF_ISBUSY(bp)); 503 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 504 505 /* 506 * Initialize the mount structure from the superblock. 507 * But first do some basic consistency checking. 508 */ 509 sbp = XFS_BUF_TO_SBP(bp); 510 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS); 511 512 error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); 513 if (error) { 514 xfs_fs_mount_cmn_err(flags, "SB validate failed"); 515 goto fail; 516 } 517 518 /* 519 * We must be able to do sector-sized and sector-aligned IO. 520 */ 521 if (sector_size > mp->m_sb.sb_sectsize) { 522 xfs_fs_mount_cmn_err(flags, 523 "device supports only %u byte sectors (not %u)", 524 sector_size, mp->m_sb.sb_sectsize); 525 error = ENOSYS; 526 goto fail; 527 } 528 529 /* 530 * If device sector size is smaller than the superblock size, 531 * re-read the superblock so the buffer is correctly sized. 532 */ 533 if (sector_size < mp->m_sb.sb_sectsize) { 534 XFS_BUF_UNMANAGE(bp); 535 xfs_buf_relse(bp); 536 sector_size = mp->m_sb.sb_sectsize; 537 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, 538 BTOBB(sector_size), extra_flags); 539 if (!bp || XFS_BUF_ISERROR(bp)) { 540 xfs_fs_mount_cmn_err(flags, "SB re-read failed"); 541 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; 542 goto fail; 543 } 544 ASSERT(XFS_BUF_ISBUSY(bp)); 545 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 546 } 547 548 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); 549 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); 550 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); 551 552 mp->m_sb_bp = bp; 553 xfs_buf_relse(bp); 554 ASSERT(XFS_BUF_VALUSEMA(bp) > 0); 555 return 0; 556 557 fail: 558 if (bp) { 559 XFS_BUF_UNMANAGE(bp); 560 xfs_buf_relse(bp); 561 } 562 return error; 563 } 564 565 566 /* 567 * xfs_mount_common 568 * 569 * Mount initialization code establishing various mount 570 * fields from the superblock associated with the given 571 * mount structure 572 */ 573 STATIC void 574 xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) 575 { 576 int i; 577 578 mp->m_agfrotor = mp->m_agirotor = 0; 579 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock"); 580 mp->m_maxagi = mp->m_sb.sb_agcount; 581 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; 582 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; 583 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; 584 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; 585 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; 586 mp->m_litino = sbp->sb_inodesize - 587 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); 588 mp->m_blockmask = sbp->sb_blocksize - 1; 589 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; 590 mp->m_blockwmask = mp->m_blockwsize - 1; 591 INIT_LIST_HEAD(&mp->m_del_inodes); 592 593 /* 594 * Setup for attributes, in case they get created. 595 * This value is for inodes getting attributes for the first time, 596 * the per-inode value is for old attribute values. 597 */ 598 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); 599 switch (sbp->sb_inodesize) { 600 case 256: 601 mp->m_attroffset = XFS_LITINO(mp) - 602 XFS_BMDR_SPACE_CALC(MINABTPTRS); 603 break; 604 case 512: 605 case 1024: 606 case 2048: 607 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); 608 break; 609 default: 610 ASSERT(0); 611 } 612 ASSERT(mp->m_attroffset < XFS_LITINO(mp)); 613 614 for (i = 0; i < 2; i++) { 615 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, 616 xfs_alloc, i == 0); 617 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, 618 xfs_alloc, i == 0); 619 } 620 for (i = 0; i < 2; i++) { 621 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, 622 xfs_bmbt, i == 0); 623 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, 624 xfs_bmbt, i == 0); 625 } 626 for (i = 0; i < 2; i++) { 627 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, 628 xfs_inobt, i == 0); 629 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, 630 xfs_inobt, i == 0); 631 } 632 633 mp->m_bsize = XFS_FSB_TO_BB(mp, 1); 634 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, 635 sbp->sb_inopblock); 636 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; 637 } 638 /* 639 * xfs_mountfs 640 * 641 * This function does the following on an initial mount of a file system: 642 * - reads the superblock from disk and init the mount struct 643 * - if we're a 32-bit kernel, do a size check on the superblock 644 * so we don't mount terabyte filesystems 645 * - init mount struct realtime fields 646 * - allocate inode hash table for fs 647 * - init directory manager 648 * - perform recovery and init the log manager 649 */ 650 int 651 xfs_mountfs( 652 bhv_vfs_t *vfsp, 653 xfs_mount_t *mp, 654 int mfsi_flags) 655 { 656 xfs_buf_t *bp; 657 xfs_sb_t *sbp = &(mp->m_sb); 658 xfs_inode_t *rip; 659 bhv_vnode_t *rvp = NULL; 660 int readio_log, writeio_log; 661 xfs_daddr_t d; 662 __uint64_t ret64; 663 __int64_t update_flags; 664 uint quotamount, quotaflags; 665 int agno; 666 int uuid_mounted = 0; 667 int error = 0; 668 669 if (mp->m_sb_bp == NULL) { 670 if ((error = xfs_readsb(mp, mfsi_flags))) { 671 return error; 672 } 673 } 674 xfs_mount_common(mp, sbp); 675 676 /* 677 * Check if sb_agblocks is aligned at stripe boundary 678 * If sb_agblocks is NOT aligned turn off m_dalign since 679 * allocator alignment is within an ag, therefore ag has 680 * to be aligned at stripe boundary. 681 */ 682 update_flags = 0LL; 683 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { 684 /* 685 * If stripe unit and stripe width are not multiples 686 * of the fs blocksize turn off alignment. 687 */ 688 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || 689 (BBTOB(mp->m_swidth) & mp->m_blockmask)) { 690 if (mp->m_flags & XFS_MOUNT_RETERR) { 691 cmn_err(CE_WARN, 692 "XFS: alignment check 1 failed"); 693 error = XFS_ERROR(EINVAL); 694 goto error1; 695 } 696 mp->m_dalign = mp->m_swidth = 0; 697 } else { 698 /* 699 * Convert the stripe unit and width to FSBs. 700 */ 701 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); 702 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { 703 if (mp->m_flags & XFS_MOUNT_RETERR) { 704 error = XFS_ERROR(EINVAL); 705 goto error1; 706 } 707 xfs_fs_cmn_err(CE_WARN, mp, 708 "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", 709 mp->m_dalign, mp->m_swidth, 710 sbp->sb_agblocks); 711 712 mp->m_dalign = 0; 713 mp->m_swidth = 0; 714 } else if (mp->m_dalign) { 715 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); 716 } else { 717 if (mp->m_flags & XFS_MOUNT_RETERR) { 718 xfs_fs_cmn_err(CE_WARN, mp, 719 "stripe alignment turned off: sunit(%d) less than bsize(%d)", 720 mp->m_dalign, 721 mp->m_blockmask +1); 722 error = XFS_ERROR(EINVAL); 723 goto error1; 724 } 725 mp->m_swidth = 0; 726 } 727 } 728 729 /* 730 * Update superblock with new values 731 * and log changes 732 */ 733 if (XFS_SB_VERSION_HASDALIGN(sbp)) { 734 if (sbp->sb_unit != mp->m_dalign) { 735 sbp->sb_unit = mp->m_dalign; 736 update_flags |= XFS_SB_UNIT; 737 } 738 if (sbp->sb_width != mp->m_swidth) { 739 sbp->sb_width = mp->m_swidth; 740 update_flags |= XFS_SB_WIDTH; 741 } 742 } 743 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && 744 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) { 745 mp->m_dalign = sbp->sb_unit; 746 mp->m_swidth = sbp->sb_width; 747 } 748 749 xfs_alloc_compute_maxlevels(mp); 750 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); 751 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); 752 xfs_ialloc_compute_maxlevels(mp); 753 754 if (sbp->sb_imax_pct) { 755 __uint64_t icount; 756 757 /* Make sure the maximum inode count is a multiple of the 758 * units we allocate inodes in. 759 */ 760 761 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 762 do_div(icount, 100); 763 do_div(icount, mp->m_ialloc_blks); 764 mp->m_maxicount = (icount * mp->m_ialloc_blks) << 765 sbp->sb_inopblog; 766 } else 767 mp->m_maxicount = 0; 768 769 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); 770 771 /* 772 * XFS uses the uuid from the superblock as the unique 773 * identifier for fsid. We can not use the uuid from the volume 774 * since a single partition filesystem is identical to a single 775 * partition volume/filesystem. 776 */ 777 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && 778 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { 779 if (xfs_uuid_mount(mp)) { 780 error = XFS_ERROR(EINVAL); 781 goto error1; 782 } 783 uuid_mounted=1; 784 ret64 = uuid_hash64(&sbp->sb_uuid); 785 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64)); 786 } 787 788 /* 789 * Set the default minimum read and write sizes unless 790 * already specified in a mount option. 791 * We use smaller I/O sizes when the file system 792 * is being used for NFS service (wsync mount option). 793 */ 794 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { 795 if (mp->m_flags & XFS_MOUNT_WSYNC) { 796 readio_log = XFS_WSYNC_READIO_LOG; 797 writeio_log = XFS_WSYNC_WRITEIO_LOG; 798 } else { 799 readio_log = XFS_READIO_LOG_LARGE; 800 writeio_log = XFS_WRITEIO_LOG_LARGE; 801 } 802 } else { 803 readio_log = mp->m_readio_log; 804 writeio_log = mp->m_writeio_log; 805 } 806 807 /* 808 * Set the number of readahead buffers to use based on 809 * physical memory size. 810 */ 811 if (xfs_physmem <= 4096) /* <= 16MB */ 812 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB; 813 else if (xfs_physmem <= 8192) /* <= 32MB */ 814 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB; 815 else 816 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32; 817 if (sbp->sb_blocklog > readio_log) { 818 mp->m_readio_log = sbp->sb_blocklog; 819 } else { 820 mp->m_readio_log = readio_log; 821 } 822 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); 823 if (sbp->sb_blocklog > writeio_log) { 824 mp->m_writeio_log = sbp->sb_blocklog; 825 } else { 826 mp->m_writeio_log = writeio_log; 827 } 828 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); 829 830 /* 831 * Set the inode cluster size based on the physical memory 832 * size. This may still be overridden by the file system 833 * block size if it is larger than the chosen cluster size. 834 */ 835 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */ 836 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE; 837 } else { 838 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; 839 } 840 /* 841 * Set whether we're using inode alignment. 842 */ 843 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) && 844 mp->m_sb.sb_inoalignmt >= 845 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) 846 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; 847 else 848 mp->m_inoalign_mask = 0; 849 /* 850 * If we are using stripe alignment, check whether 851 * the stripe unit is a multiple of the inode alignment 852 */ 853 if (mp->m_dalign && mp->m_inoalign_mask && 854 !(mp->m_dalign & mp->m_inoalign_mask)) 855 mp->m_sinoalign = mp->m_dalign; 856 else 857 mp->m_sinoalign = 0; 858 /* 859 * Check that the data (and log if separate) are an ok size. 860 */ 861 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); 862 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { 863 cmn_err(CE_WARN, "XFS: size check 1 failed"); 864 error = XFS_ERROR(E2BIG); 865 goto error1; 866 } 867 error = xfs_read_buf(mp, mp->m_ddev_targp, 868 d - XFS_FSS_TO_BB(mp, 1), 869 XFS_FSS_TO_BB(mp, 1), 0, &bp); 870 if (!error) { 871 xfs_buf_relse(bp); 872 } else { 873 cmn_err(CE_WARN, "XFS: size check 2 failed"); 874 if (error == ENOSPC) { 875 error = XFS_ERROR(E2BIG); 876 } 877 goto error1; 878 } 879 880 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && 881 mp->m_logdev_targp != mp->m_ddev_targp) { 882 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); 883 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { 884 cmn_err(CE_WARN, "XFS: size check 3 failed"); 885 error = XFS_ERROR(E2BIG); 886 goto error1; 887 } 888 error = xfs_read_buf(mp, mp->m_logdev_targp, 889 d - XFS_FSB_TO_BB(mp, 1), 890 XFS_FSB_TO_BB(mp, 1), 0, &bp); 891 if (!error) { 892 xfs_buf_relse(bp); 893 } else { 894 cmn_err(CE_WARN, "XFS: size check 3 failed"); 895 if (error == ENOSPC) { 896 error = XFS_ERROR(E2BIG); 897 } 898 goto error1; 899 } 900 } 901 902 /* 903 * Initialize realtime fields in the mount structure 904 */ 905 if ((error = xfs_rtmount_init(mp))) { 906 cmn_err(CE_WARN, "XFS: RT mount failed"); 907 goto error1; 908 } 909 910 /* 911 * For client case we are done now 912 */ 913 if (mfsi_flags & XFS_MFSI_CLIENT) { 914 return 0; 915 } 916 917 /* 918 * Copies the low order bits of the timestamp and the randomly 919 * set "sequence" number out of a UUID. 920 */ 921 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); 922 923 /* 924 * The vfs structure needs to have a file system independent 925 * way of checking for the invariant file system ID. Since it 926 * can't look at mount structures it has a pointer to the data 927 * in the mount structure. 928 * 929 * File systems that don't support user level file handles (i.e. 930 * all of them except for XFS) will leave vfs_altfsid as NULL. 931 */ 932 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid; 933 mp->m_dmevmask = 0; /* not persistent; set after each mount */ 934 935 xfs_dir_mount(mp); 936 937 /* 938 * Initialize the attribute manager's entries. 939 */ 940 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; 941 942 /* 943 * Initialize the precomputed transaction reservations values. 944 */ 945 xfs_trans_init(mp); 946 947 /* 948 * Allocate and initialize the inode hash table for this 949 * file system. 950 */ 951 xfs_ihash_init(mp); 952 xfs_chash_init(mp); 953 954 /* 955 * Allocate and initialize the per-ag data. 956 */ 957 init_rwsem(&mp->m_peraglock); 958 mp->m_perag = 959 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); 960 961 mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount); 962 963 /* 964 * log's mount-time initialization. Perform 1st part recovery if needed 965 */ 966 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ 967 error = xfs_log_mount(mp, mp->m_logdev_targp, 968 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), 969 XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); 970 if (error) { 971 cmn_err(CE_WARN, "XFS: log mount failed"); 972 goto error2; 973 } 974 } else { /* No log has been defined */ 975 cmn_err(CE_WARN, "XFS: no log defined"); 976 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); 977 error = XFS_ERROR(EFSCORRUPTED); 978 goto error2; 979 } 980 981 /* 982 * Get and sanity-check the root inode. 983 * Save the pointer to it in the mount structure. 984 */ 985 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); 986 if (error) { 987 cmn_err(CE_WARN, "XFS: failed to read root inode"); 988 goto error3; 989 } 990 991 ASSERT(rip != NULL); 992 rvp = XFS_ITOV(rip); 993 994 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { 995 cmn_err(CE_WARN, "XFS: corrupted root inode"); 996 cmn_err(CE_WARN, "Device %s - root %llu is not a directory", 997 XFS_BUFTARG_NAME(mp->m_ddev_targp), 998 (unsigned long long)rip->i_ino); 999 xfs_iunlock(rip, XFS_ILOCK_EXCL); 1000 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, 1001 mp); 1002 error = XFS_ERROR(EFSCORRUPTED); 1003 goto error4; 1004 } 1005 mp->m_rootip = rip; /* save it */ 1006 1007 xfs_iunlock(rip, XFS_ILOCK_EXCL); 1008 1009 /* 1010 * Initialize realtime inode pointers in the mount structure 1011 */ 1012 if ((error = xfs_rtmount_inodes(mp))) { 1013 /* 1014 * Free up the root inode. 1015 */ 1016 cmn_err(CE_WARN, "XFS: failed to read RT inodes"); 1017 goto error4; 1018 } 1019 1020 /* 1021 * If fs is not mounted readonly, then update the superblock 1022 * unit and width changes. 1023 */ 1024 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY)) 1025 xfs_mount_log_sbunit(mp, update_flags); 1026 1027 /* 1028 * Initialise the XFS quota management subsystem for this mount 1029 */ 1030 if ((error = XFS_QM_INIT(mp, "amount, "aflags))) 1031 goto error4; 1032 1033 /* 1034 * Finish recovering the file system. This part needed to be 1035 * delayed until after the root and real-time bitmap inodes 1036 * were consistently read in. 1037 */ 1038 error = xfs_log_mount_finish(mp, mfsi_flags); 1039 if (error) { 1040 cmn_err(CE_WARN, "XFS: log mount finish failed"); 1041 goto error4; 1042 } 1043 1044 /* 1045 * Complete the quota initialisation, post-log-replay component. 1046 */ 1047 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags))) 1048 goto error4; 1049 1050 return 0; 1051 1052 error4: 1053 /* 1054 * Free up the root inode. 1055 */ 1056 VN_RELE(rvp); 1057 error3: 1058 xfs_log_unmount_dealloc(mp); 1059 error2: 1060 xfs_ihash_free(mp); 1061 xfs_chash_free(mp); 1062 for (agno = 0; agno < sbp->sb_agcount; agno++) 1063 if (mp->m_perag[agno].pagb_list) 1064 kmem_free(mp->m_perag[agno].pagb_list, 1065 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); 1066 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); 1067 mp->m_perag = NULL; 1068 /* FALLTHROUGH */ 1069 error1: 1070 if (uuid_mounted) 1071 xfs_uuid_unmount(mp); 1072 xfs_freesb(mp); 1073 return error; 1074 } 1075 1076 /* 1077 * xfs_unmountfs 1078 * 1079 * This flushes out the inodes,dquots and the superblock, unmounts the 1080 * log and makes sure that incore structures are freed. 1081 */ 1082 int 1083 xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) 1084 { 1085 struct bhv_vfs *vfsp = XFS_MTOVFS(mp); 1086 #if defined(DEBUG) || defined(INDUCE_IO_ERROR) 1087 int64_t fsid; 1088 #endif 1089 1090 xfs_iflush_all(mp); 1091 1092 XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); 1093 1094 /* 1095 * Flush out the log synchronously so that we know for sure 1096 * that nothing is pinned. This is important because bflush() 1097 * will skip pinned buffers. 1098 */ 1099 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); 1100 1101 xfs_binval(mp->m_ddev_targp); 1102 if (mp->m_rtdev_targp) { 1103 xfs_binval(mp->m_rtdev_targp); 1104 } 1105 1106 xfs_unmountfs_writesb(mp); 1107 1108 xfs_unmountfs_wait(mp); /* wait for async bufs */ 1109 1110 xfs_log_unmount(mp); /* Done! No more fs ops. */ 1111 1112 xfs_freesb(mp); 1113 1114 /* 1115 * All inodes from this mount point should be freed. 1116 */ 1117 ASSERT(mp->m_inodes == NULL); 1118 1119 xfs_unmountfs_close(mp, cr); 1120 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) 1121 xfs_uuid_unmount(mp); 1122 1123 #if defined(DEBUG) || defined(INDUCE_IO_ERROR) 1124 /* 1125 * clear all error tags on this filesystem 1126 */ 1127 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t)); 1128 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0); 1129 #endif 1130 XFS_IODONE(vfsp); 1131 xfs_mount_free(mp, 1); 1132 return 0; 1133 } 1134 1135 void 1136 xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) 1137 { 1138 if (mp->m_logdev_targp != mp->m_ddev_targp) 1139 xfs_free_buftarg(mp->m_logdev_targp, 1); 1140 if (mp->m_rtdev_targp) 1141 xfs_free_buftarg(mp->m_rtdev_targp, 1); 1142 xfs_free_buftarg(mp->m_ddev_targp, 0); 1143 } 1144 1145 STATIC void 1146 xfs_unmountfs_wait(xfs_mount_t *mp) 1147 { 1148 if (mp->m_logdev_targp != mp->m_ddev_targp) 1149 xfs_wait_buftarg(mp->m_logdev_targp); 1150 if (mp->m_rtdev_targp) 1151 xfs_wait_buftarg(mp->m_rtdev_targp); 1152 xfs_wait_buftarg(mp->m_ddev_targp); 1153 } 1154 1155 int 1156 xfs_unmountfs_writesb(xfs_mount_t *mp) 1157 { 1158 xfs_buf_t *sbp; 1159 xfs_sb_t *sb; 1160 int error = 0; 1161 1162 /* 1163 * skip superblock write if fs is read-only, or 1164 * if we are doing a forced umount. 1165 */ 1166 sbp = xfs_getsb(mp, 0); 1167 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY || 1168 XFS_FORCED_SHUTDOWN(mp))) { 1169 1170 xfs_icsb_sync_counters(mp); 1171 1172 /* 1173 * mark shared-readonly if desired 1174 */ 1175 sb = XFS_BUF_TO_SBP(sbp); 1176 if (mp->m_mk_sharedro) { 1177 if (!(sb->sb_flags & XFS_SBF_READONLY)) 1178 sb->sb_flags |= XFS_SBF_READONLY; 1179 if (!XFS_SB_VERSION_HASSHARED(sb)) 1180 XFS_SB_VERSION_ADDSHARED(sb); 1181 xfs_fs_cmn_err(CE_NOTE, mp, 1182 "Unmounting, marking shared read-only"); 1183 } 1184 XFS_BUF_UNDONE(sbp); 1185 XFS_BUF_UNREAD(sbp); 1186 XFS_BUF_UNDELAYWRITE(sbp); 1187 XFS_BUF_WRITE(sbp); 1188 XFS_BUF_UNASYNC(sbp); 1189 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); 1190 xfsbdstrat(mp, sbp); 1191 /* Nevermind errors we might get here. */ 1192 error = xfs_iowait(sbp); 1193 if (error) 1194 xfs_ioerror_alert("xfs_unmountfs_writesb", 1195 mp, sbp, XFS_BUF_ADDR(sbp)); 1196 if (error && mp->m_mk_sharedro) 1197 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); 1198 } 1199 xfs_buf_relse(sbp); 1200 return error; 1201 } 1202 1203 /* 1204 * xfs_mod_sb() can be used to copy arbitrary changes to the 1205 * in-core superblock into the superblock buffer to be logged. 1206 * It does not provide the higher level of locking that is 1207 * needed to protect the in-core superblock from concurrent 1208 * access. 1209 */ 1210 void 1211 xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) 1212 { 1213 xfs_buf_t *bp; 1214 int first; 1215 int last; 1216 xfs_mount_t *mp; 1217 xfs_sb_t *sbp; 1218 xfs_sb_field_t f; 1219 1220 ASSERT(fields); 1221 if (!fields) 1222 return; 1223 mp = tp->t_mountp; 1224 bp = xfs_trans_getsb(tp, mp, 0); 1225 sbp = XFS_BUF_TO_SBP(bp); 1226 first = sizeof(xfs_sb_t); 1227 last = 0; 1228 1229 /* translate/copy */ 1230 1231 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields); 1232 1233 /* find modified range */ 1234 1235 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); 1236 ASSERT((1LL << f) & XFS_SB_MOD_BITS); 1237 first = xfs_sb_info[f].offset; 1238 1239 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); 1240 ASSERT((1LL << f) & XFS_SB_MOD_BITS); 1241 last = xfs_sb_info[f + 1].offset - 1; 1242 1243 xfs_trans_log_buf(tp, bp, first, last); 1244 } 1245 1246 /* 1247 * In order to avoid ENOSPC-related deadlock caused by 1248 * out-of-order locking of AGF buffer (PV 947395), we place 1249 * constraints on the relationship among actual allocations for 1250 * data blocks, freelist blocks, and potential file data bmap 1251 * btree blocks. However, these restrictions may result in no 1252 * actual space allocated for a delayed extent, for example, a data 1253 * block in a certain AG is allocated but there is no additional 1254 * block for the additional bmap btree block due to a split of the 1255 * bmap btree of the file. The result of this may lead to an 1256 * infinite loop in xfssyncd when the file gets flushed to disk and 1257 * all delayed extents need to be actually allocated. To get around 1258 * this, we explicitly set aside a few blocks which will not be 1259 * reserved in delayed allocation. Considering the minimum number of 1260 * needed freelist blocks is 4 fsbs, a potential split of file's bmap 1261 * btree requires 1 fsb, so we set the number of set-aside blocks to 8. 1262 */ 1263 #define SET_ASIDE_BLOCKS 8 1264 1265 /* 1266 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply 1267 * a delta to a specified field in the in-core superblock. Simply 1268 * switch on the field indicated and apply the delta to that field. 1269 * Fields are not allowed to dip below zero, so if the delta would 1270 * do this do not apply it and return EINVAL. 1271 * 1272 * The SB_LOCK must be held when this routine is called. 1273 */ 1274 int 1275 xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field, 1276 int delta, int rsvd) 1277 { 1278 int scounter; /* short counter for 32 bit fields */ 1279 long long lcounter; /* long counter for 64 bit fields */ 1280 long long res_used, rem; 1281 1282 /* 1283 * With the in-core superblock spin lock held, switch 1284 * on the indicated field. Apply the delta to the 1285 * proper field. If the fields value would dip below 1286 * 0, then do not apply the delta and return EINVAL. 1287 */ 1288 switch (field) { 1289 case XFS_SBS_ICOUNT: 1290 lcounter = (long long)mp->m_sb.sb_icount; 1291 lcounter += delta; 1292 if (lcounter < 0) { 1293 ASSERT(0); 1294 return XFS_ERROR(EINVAL); 1295 } 1296 mp->m_sb.sb_icount = lcounter; 1297 return 0; 1298 case XFS_SBS_IFREE: 1299 lcounter = (long long)mp->m_sb.sb_ifree; 1300 lcounter += delta; 1301 if (lcounter < 0) { 1302 ASSERT(0); 1303 return XFS_ERROR(EINVAL); 1304 } 1305 mp->m_sb.sb_ifree = lcounter; 1306 return 0; 1307 case XFS_SBS_FDBLOCKS: 1308 1309 lcounter = (long long)mp->m_sb.sb_fdblocks - SET_ASIDE_BLOCKS; 1310 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); 1311 1312 if (delta > 0) { /* Putting blocks back */ 1313 if (res_used > delta) { 1314 mp->m_resblks_avail += delta; 1315 } else { 1316 rem = delta - res_used; 1317 mp->m_resblks_avail = mp->m_resblks; 1318 lcounter += rem; 1319 } 1320 } else { /* Taking blocks away */ 1321 1322 lcounter += delta; 1323 1324 /* 1325 * If were out of blocks, use any available reserved blocks if 1326 * were allowed to. 1327 */ 1328 1329 if (lcounter < 0) { 1330 if (rsvd) { 1331 lcounter = (long long)mp->m_resblks_avail + delta; 1332 if (lcounter < 0) { 1333 return XFS_ERROR(ENOSPC); 1334 } 1335 mp->m_resblks_avail = lcounter; 1336 return 0; 1337 } else { /* not reserved */ 1338 return XFS_ERROR(ENOSPC); 1339 } 1340 } 1341 } 1342 1343 mp->m_sb.sb_fdblocks = lcounter + SET_ASIDE_BLOCKS; 1344 return 0; 1345 case XFS_SBS_FREXTENTS: 1346 lcounter = (long long)mp->m_sb.sb_frextents; 1347 lcounter += delta; 1348 if (lcounter < 0) { 1349 return XFS_ERROR(ENOSPC); 1350 } 1351 mp->m_sb.sb_frextents = lcounter; 1352 return 0; 1353 case XFS_SBS_DBLOCKS: 1354 lcounter = (long long)mp->m_sb.sb_dblocks; 1355 lcounter += delta; 1356 if (lcounter < 0) { 1357 ASSERT(0); 1358 return XFS_ERROR(EINVAL); 1359 } 1360 mp->m_sb.sb_dblocks = lcounter; 1361 return 0; 1362 case XFS_SBS_AGCOUNT: 1363 scounter = mp->m_sb.sb_agcount; 1364 scounter += delta; 1365 if (scounter < 0) { 1366 ASSERT(0); 1367 return XFS_ERROR(EINVAL); 1368 } 1369 mp->m_sb.sb_agcount = scounter; 1370 return 0; 1371 case XFS_SBS_IMAX_PCT: 1372 scounter = mp->m_sb.sb_imax_pct; 1373 scounter += delta; 1374 if (scounter < 0) { 1375 ASSERT(0); 1376 return XFS_ERROR(EINVAL); 1377 } 1378 mp->m_sb.sb_imax_pct = scounter; 1379 return 0; 1380 case XFS_SBS_REXTSIZE: 1381 scounter = mp->m_sb.sb_rextsize; 1382 scounter += delta; 1383 if (scounter < 0) { 1384 ASSERT(0); 1385 return XFS_ERROR(EINVAL); 1386 } 1387 mp->m_sb.sb_rextsize = scounter; 1388 return 0; 1389 case XFS_SBS_RBMBLOCKS: 1390 scounter = mp->m_sb.sb_rbmblocks; 1391 scounter += delta; 1392 if (scounter < 0) { 1393 ASSERT(0); 1394 return XFS_ERROR(EINVAL); 1395 } 1396 mp->m_sb.sb_rbmblocks = scounter; 1397 return 0; 1398 case XFS_SBS_RBLOCKS: 1399 lcounter = (long long)mp->m_sb.sb_rblocks; 1400 lcounter += delta; 1401 if (lcounter < 0) { 1402 ASSERT(0); 1403 return XFS_ERROR(EINVAL); 1404 } 1405 mp->m_sb.sb_rblocks = lcounter; 1406 return 0; 1407 case XFS_SBS_REXTENTS: 1408 lcounter = (long long)mp->m_sb.sb_rextents; 1409 lcounter += delta; 1410 if (lcounter < 0) { 1411 ASSERT(0); 1412 return XFS_ERROR(EINVAL); 1413 } 1414 mp->m_sb.sb_rextents = lcounter; 1415 return 0; 1416 case XFS_SBS_REXTSLOG: 1417 scounter = mp->m_sb.sb_rextslog; 1418 scounter += delta; 1419 if (scounter < 0) { 1420 ASSERT(0); 1421 return XFS_ERROR(EINVAL); 1422 } 1423 mp->m_sb.sb_rextslog = scounter; 1424 return 0; 1425 default: 1426 ASSERT(0); 1427 return XFS_ERROR(EINVAL); 1428 } 1429 } 1430 1431 /* 1432 * xfs_mod_incore_sb() is used to change a field in the in-core 1433 * superblock structure by the specified delta. This modification 1434 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked() 1435 * routine to do the work. 1436 */ 1437 int 1438 xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd) 1439 { 1440 unsigned long s; 1441 int status; 1442 1443 /* check for per-cpu counters */ 1444 switch (field) { 1445 #ifdef HAVE_PERCPU_SB 1446 case XFS_SBS_ICOUNT: 1447 case XFS_SBS_IFREE: 1448 case XFS_SBS_FDBLOCKS: 1449 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { 1450 status = xfs_icsb_modify_counters(mp, field, 1451 delta, rsvd); 1452 break; 1453 } 1454 /* FALLTHROUGH */ 1455 #endif 1456 default: 1457 s = XFS_SB_LOCK(mp); 1458 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); 1459 XFS_SB_UNLOCK(mp, s); 1460 break; 1461 } 1462 1463 return status; 1464 } 1465 1466 /* 1467 * xfs_mod_incore_sb_batch() is used to change more than one field 1468 * in the in-core superblock structure at a time. This modification 1469 * is protected by a lock internal to this module. The fields and 1470 * changes to those fields are specified in the array of xfs_mod_sb 1471 * structures passed in. 1472 * 1473 * Either all of the specified deltas will be applied or none of 1474 * them will. If any modified field dips below 0, then all modifications 1475 * will be backed out and EINVAL will be returned. 1476 */ 1477 int 1478 xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) 1479 { 1480 unsigned long s; 1481 int status=0; 1482 xfs_mod_sb_t *msbp; 1483 1484 /* 1485 * Loop through the array of mod structures and apply each 1486 * individually. If any fail, then back out all those 1487 * which have already been applied. Do all of this within 1488 * the scope of the SB_LOCK so that all of the changes will 1489 * be atomic. 1490 */ 1491 s = XFS_SB_LOCK(mp); 1492 msbp = &msb[0]; 1493 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { 1494 /* 1495 * Apply the delta at index n. If it fails, break 1496 * from the loop so we'll fall into the undo loop 1497 * below. 1498 */ 1499 switch (msbp->msb_field) { 1500 #ifdef HAVE_PERCPU_SB 1501 case XFS_SBS_ICOUNT: 1502 case XFS_SBS_IFREE: 1503 case XFS_SBS_FDBLOCKS: 1504 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { 1505 status = xfs_icsb_modify_counters_locked(mp, 1506 msbp->msb_field, 1507 msbp->msb_delta, rsvd); 1508 break; 1509 } 1510 /* FALLTHROUGH */ 1511 #endif 1512 default: 1513 status = xfs_mod_incore_sb_unlocked(mp, 1514 msbp->msb_field, 1515 msbp->msb_delta, rsvd); 1516 break; 1517 } 1518 1519 if (status != 0) { 1520 break; 1521 } 1522 } 1523 1524 /* 1525 * If we didn't complete the loop above, then back out 1526 * any changes made to the superblock. If you add code 1527 * between the loop above and here, make sure that you 1528 * preserve the value of status. Loop back until 1529 * we step below the beginning of the array. Make sure 1530 * we don't touch anything back there. 1531 */ 1532 if (status != 0) { 1533 msbp--; 1534 while (msbp >= msb) { 1535 switch (msbp->msb_field) { 1536 #ifdef HAVE_PERCPU_SB 1537 case XFS_SBS_ICOUNT: 1538 case XFS_SBS_IFREE: 1539 case XFS_SBS_FDBLOCKS: 1540 if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { 1541 status = 1542 xfs_icsb_modify_counters_locked(mp, 1543 msbp->msb_field, 1544 -(msbp->msb_delta), 1545 rsvd); 1546 break; 1547 } 1548 /* FALLTHROUGH */ 1549 #endif 1550 default: 1551 status = xfs_mod_incore_sb_unlocked(mp, 1552 msbp->msb_field, 1553 -(msbp->msb_delta), 1554 rsvd); 1555 break; 1556 } 1557 ASSERT(status == 0); 1558 msbp--; 1559 } 1560 } 1561 XFS_SB_UNLOCK(mp, s); 1562 return status; 1563 } 1564 1565 /* 1566 * xfs_getsb() is called to obtain the buffer for the superblock. 1567 * The buffer is returned locked and read in from disk. 1568 * The buffer should be released with a call to xfs_brelse(). 1569 * 1570 * If the flags parameter is BUF_TRYLOCK, then we'll only return 1571 * the superblock buffer if it can be locked without sleeping. 1572 * If it can't then we'll return NULL. 1573 */ 1574 xfs_buf_t * 1575 xfs_getsb( 1576 xfs_mount_t *mp, 1577 int flags) 1578 { 1579 xfs_buf_t *bp; 1580 1581 ASSERT(mp->m_sb_bp != NULL); 1582 bp = mp->m_sb_bp; 1583 if (flags & XFS_BUF_TRYLOCK) { 1584 if (!XFS_BUF_CPSEMA(bp)) { 1585 return NULL; 1586 } 1587 } else { 1588 XFS_BUF_PSEMA(bp, PRIBIO); 1589 } 1590 XFS_BUF_HOLD(bp); 1591 ASSERT(XFS_BUF_ISDONE(bp)); 1592 return bp; 1593 } 1594 1595 /* 1596 * Used to free the superblock along various error paths. 1597 */ 1598 void 1599 xfs_freesb( 1600 xfs_mount_t *mp) 1601 { 1602 xfs_buf_t *bp; 1603 1604 /* 1605 * Use xfs_getsb() so that the buffer will be locked 1606 * when we call xfs_buf_relse(). 1607 */ 1608 bp = xfs_getsb(mp, 0); 1609 XFS_BUF_UNMANAGE(bp); 1610 xfs_buf_relse(bp); 1611 mp->m_sb_bp = NULL; 1612 } 1613 1614 /* 1615 * See if the UUID is unique among mounted XFS filesystems. 1616 * Mount fails if UUID is nil or a FS with the same UUID is already mounted. 1617 */ 1618 STATIC int 1619 xfs_uuid_mount( 1620 xfs_mount_t *mp) 1621 { 1622 if (uuid_is_nil(&mp->m_sb.sb_uuid)) { 1623 cmn_err(CE_WARN, 1624 "XFS: Filesystem %s has nil UUID - can't mount", 1625 mp->m_fsname); 1626 return -1; 1627 } 1628 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { 1629 cmn_err(CE_WARN, 1630 "XFS: Filesystem %s has duplicate UUID - can't mount", 1631 mp->m_fsname); 1632 return -1; 1633 } 1634 return 0; 1635 } 1636 1637 /* 1638 * Remove filesystem from the UUID table. 1639 */ 1640 STATIC void 1641 xfs_uuid_unmount( 1642 xfs_mount_t *mp) 1643 { 1644 uuid_table_remove(&mp->m_sb.sb_uuid); 1645 } 1646 1647 /* 1648 * Used to log changes to the superblock unit and width fields which could 1649 * be altered by the mount options. Only the first superblock is updated. 1650 */ 1651 STATIC void 1652 xfs_mount_log_sbunit( 1653 xfs_mount_t *mp, 1654 __int64_t fields) 1655 { 1656 xfs_trans_t *tp; 1657 1658 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); 1659 1660 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); 1661 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, 1662 XFS_DEFAULT_LOG_COUNT)) { 1663 xfs_trans_cancel(tp, 0); 1664 return; 1665 } 1666 xfs_mod_sb(tp, fields); 1667 xfs_trans_commit(tp, 0, NULL); 1668 } 1669 1670 1671 #ifdef HAVE_PERCPU_SB 1672 /* 1673 * Per-cpu incore superblock counters 1674 * 1675 * Simple concept, difficult implementation 1676 * 1677 * Basically, replace the incore superblock counters with a distributed per cpu 1678 * counter for contended fields (e.g. free block count). 1679 * 1680 * Difficulties arise in that the incore sb is used for ENOSPC checking, and 1681 * hence needs to be accurately read when we are running low on space. Hence 1682 * there is a method to enable and disable the per-cpu counters based on how 1683 * much "stuff" is available in them. 1684 * 1685 * Basically, a counter is enabled if there is enough free resource to justify 1686 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local 1687 * ENOSPC), then we disable the counters to synchronise all callers and 1688 * re-distribute the available resources. 1689 * 1690 * If, once we redistributed the available resources, we still get a failure, 1691 * we disable the per-cpu counter and go through the slow path. 1692 * 1693 * The slow path is the current xfs_mod_incore_sb() function. This means that 1694 * when we disable a per-cpu counter, we need to drain it's resources back to 1695 * the global superblock. We do this after disabling the counter to prevent 1696 * more threads from queueing up on the counter. 1697 * 1698 * Essentially, this means that we still need a lock in the fast path to enable 1699 * synchronisation between the global counters and the per-cpu counters. This 1700 * is not a problem because the lock will be local to a CPU almost all the time 1701 * and have little contention except when we get to ENOSPC conditions. 1702 * 1703 * Basically, this lock becomes a barrier that enables us to lock out the fast 1704 * path while we do things like enabling and disabling counters and 1705 * synchronising the counters. 1706 * 1707 * Locking rules: 1708 * 1709 * 1. XFS_SB_LOCK() before picking up per-cpu locks 1710 * 2. per-cpu locks always picked up via for_each_online_cpu() order 1711 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks 1712 * 4. modifying per-cpu counters requires holding per-cpu lock 1713 * 5. modifying global counters requires holding XFS_SB_LOCK 1714 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK 1715 * and _none_ of the per-cpu locks. 1716 * 1717 * Disabled counters are only ever re-enabled by a balance operation 1718 * that results in more free resources per CPU than a given threshold. 1719 * To ensure counters don't remain disabled, they are rebalanced when 1720 * the global resource goes above a higher threshold (i.e. some hysteresis 1721 * is present to prevent thrashing). 1722 */ 1723 1724 /* 1725 * hot-plug CPU notifier support. 1726 * 1727 * We cannot use the hotcpu_register() function because it does 1728 * not allow notifier instances. We need a notifier per filesystem 1729 * as we need to be able to identify the filesystem to balance 1730 * the counters out. This is achieved by having a notifier block 1731 * embedded in the xfs_mount_t and doing pointer magic to get the 1732 * mount pointer from the notifier block address. 1733 */ 1734 STATIC int 1735 xfs_icsb_cpu_notify( 1736 struct notifier_block *nfb, 1737 unsigned long action, 1738 void *hcpu) 1739 { 1740 xfs_icsb_cnts_t *cntp; 1741 xfs_mount_t *mp; 1742 int s; 1743 1744 mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); 1745 cntp = (xfs_icsb_cnts_t *) 1746 per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); 1747 switch (action) { 1748 case CPU_UP_PREPARE: 1749 /* Easy Case - initialize the area and locks, and 1750 * then rebalance when online does everything else for us. */ 1751 memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); 1752 break; 1753 case CPU_ONLINE: 1754 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); 1755 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); 1756 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); 1757 break; 1758 case CPU_DEAD: 1759 /* Disable all the counters, then fold the dead cpu's 1760 * count into the total on the global superblock and 1761 * re-enable the counters. */ 1762 s = XFS_SB_LOCK(mp); 1763 xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); 1764 xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); 1765 xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); 1766 1767 mp->m_sb.sb_icount += cntp->icsb_icount; 1768 mp->m_sb.sb_ifree += cntp->icsb_ifree; 1769 mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; 1770 1771 memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); 1772 1773 xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, XFS_ICSB_SB_LOCKED); 1774 xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, XFS_ICSB_SB_LOCKED); 1775 xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, XFS_ICSB_SB_LOCKED); 1776 XFS_SB_UNLOCK(mp, s); 1777 break; 1778 } 1779 1780 return NOTIFY_OK; 1781 } 1782 1783 int 1784 xfs_icsb_init_counters( 1785 xfs_mount_t *mp) 1786 { 1787 xfs_icsb_cnts_t *cntp; 1788 int i; 1789 1790 mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); 1791 if (mp->m_sb_cnts == NULL) 1792 return -ENOMEM; 1793 1794 mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; 1795 mp->m_icsb_notifier.priority = 0; 1796 register_cpu_notifier(&mp->m_icsb_notifier); 1797 1798 for_each_online_cpu(i) { 1799 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); 1800 memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); 1801 } 1802 /* 1803 * start with all counters disabled so that the 1804 * initial balance kicks us off correctly 1805 */ 1806 mp->m_icsb_counters = -1; 1807 return 0; 1808 } 1809 1810 STATIC void 1811 xfs_icsb_destroy_counters( 1812 xfs_mount_t *mp) 1813 { 1814 if (mp->m_sb_cnts) { 1815 unregister_cpu_notifier(&mp->m_icsb_notifier); 1816 free_percpu(mp->m_sb_cnts); 1817 } 1818 } 1819 1820 STATIC inline void 1821 xfs_icsb_lock_cntr( 1822 xfs_icsb_cnts_t *icsbp) 1823 { 1824 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { 1825 ndelay(1000); 1826 } 1827 } 1828 1829 STATIC inline void 1830 xfs_icsb_unlock_cntr( 1831 xfs_icsb_cnts_t *icsbp) 1832 { 1833 clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); 1834 } 1835 1836 1837 STATIC inline void 1838 xfs_icsb_lock_all_counters( 1839 xfs_mount_t *mp) 1840 { 1841 xfs_icsb_cnts_t *cntp; 1842 int i; 1843 1844 for_each_online_cpu(i) { 1845 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); 1846 xfs_icsb_lock_cntr(cntp); 1847 } 1848 } 1849 1850 STATIC inline void 1851 xfs_icsb_unlock_all_counters( 1852 xfs_mount_t *mp) 1853 { 1854 xfs_icsb_cnts_t *cntp; 1855 int i; 1856 1857 for_each_online_cpu(i) { 1858 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); 1859 xfs_icsb_unlock_cntr(cntp); 1860 } 1861 } 1862 1863 STATIC void 1864 xfs_icsb_count( 1865 xfs_mount_t *mp, 1866 xfs_icsb_cnts_t *cnt, 1867 int flags) 1868 { 1869 xfs_icsb_cnts_t *cntp; 1870 int i; 1871 1872 memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); 1873 1874 if (!(flags & XFS_ICSB_LAZY_COUNT)) 1875 xfs_icsb_lock_all_counters(mp); 1876 1877 for_each_online_cpu(i) { 1878 cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); 1879 cnt->icsb_icount += cntp->icsb_icount; 1880 cnt->icsb_ifree += cntp->icsb_ifree; 1881 cnt->icsb_fdblocks += cntp->icsb_fdblocks; 1882 } 1883 1884 if (!(flags & XFS_ICSB_LAZY_COUNT)) 1885 xfs_icsb_unlock_all_counters(mp); 1886 } 1887 1888 STATIC int 1889 xfs_icsb_counter_disabled( 1890 xfs_mount_t *mp, 1891 xfs_sb_field_t field) 1892 { 1893 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); 1894 return test_bit(field, &mp->m_icsb_counters); 1895 } 1896 1897 STATIC int 1898 xfs_icsb_disable_counter( 1899 xfs_mount_t *mp, 1900 xfs_sb_field_t field) 1901 { 1902 xfs_icsb_cnts_t cnt; 1903 1904 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); 1905 1906 xfs_icsb_lock_all_counters(mp); 1907 if (!test_and_set_bit(field, &mp->m_icsb_counters)) { 1908 /* drain back to superblock */ 1909 1910 xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); 1911 switch(field) { 1912 case XFS_SBS_ICOUNT: 1913 mp->m_sb.sb_icount = cnt.icsb_icount; 1914 break; 1915 case XFS_SBS_IFREE: 1916 mp->m_sb.sb_ifree = cnt.icsb_ifree; 1917 break; 1918 case XFS_SBS_FDBLOCKS: 1919 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; 1920 break; 1921 default: 1922 BUG(); 1923 } 1924 } 1925 1926 xfs_icsb_unlock_all_counters(mp); 1927 1928 return 0; 1929 } 1930 1931 STATIC void 1932 xfs_icsb_enable_counter( 1933 xfs_mount_t *mp, 1934 xfs_sb_field_t field, 1935 uint64_t count, 1936 uint64_t resid) 1937 { 1938 xfs_icsb_cnts_t *cntp; 1939 int i; 1940 1941 ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); 1942 1943 xfs_icsb_lock_all_counters(mp); 1944 for_each_online_cpu(i) { 1945 cntp = per_cpu_ptr(mp->m_sb_cnts, i); 1946 switch (field) { 1947 case XFS_SBS_ICOUNT: 1948 cntp->icsb_icount = count + resid; 1949 break; 1950 case XFS_SBS_IFREE: 1951 cntp->icsb_ifree = count + resid; 1952 break; 1953 case XFS_SBS_FDBLOCKS: 1954 cntp->icsb_fdblocks = count + resid; 1955 break; 1956 default: 1957 BUG(); 1958 break; 1959 } 1960 resid = 0; 1961 } 1962 clear_bit(field, &mp->m_icsb_counters); 1963 xfs_icsb_unlock_all_counters(mp); 1964 } 1965 1966 STATIC void 1967 xfs_icsb_sync_counters_int( 1968 xfs_mount_t *mp, 1969 int flags) 1970 { 1971 xfs_icsb_cnts_t cnt; 1972 int s; 1973 1974 /* Pass 1: lock all counters */ 1975 if ((flags & XFS_ICSB_SB_LOCKED) == 0) 1976 s = XFS_SB_LOCK(mp); 1977 1978 xfs_icsb_count(mp, &cnt, flags); 1979 1980 /* Step 3: update mp->m_sb fields */ 1981 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) 1982 mp->m_sb.sb_icount = cnt.icsb_icount; 1983 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) 1984 mp->m_sb.sb_ifree = cnt.icsb_ifree; 1985 if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) 1986 mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; 1987 1988 if ((flags & XFS_ICSB_SB_LOCKED) == 0) 1989 XFS_SB_UNLOCK(mp, s); 1990 } 1991 1992 /* 1993 * Accurate update of per-cpu counters to incore superblock 1994 */ 1995 STATIC void 1996 xfs_icsb_sync_counters( 1997 xfs_mount_t *mp) 1998 { 1999 xfs_icsb_sync_counters_int(mp, 0); 2000 } 2001 2002 /* 2003 * lazy addition used for things like df, background sb syncs, etc 2004 */ 2005 void 2006 xfs_icsb_sync_counters_lazy( 2007 xfs_mount_t *mp) 2008 { 2009 xfs_icsb_sync_counters_int(mp, XFS_ICSB_LAZY_COUNT); 2010 } 2011 2012 /* 2013 * Balance and enable/disable counters as necessary. 2014 * 2015 * Thresholds for re-enabling counters are somewhat magic. 2016 * inode counts are chosen to be the same number as single 2017 * on disk allocation chunk per CPU, and free blocks is 2018 * something far enough zero that we aren't going thrash 2019 * when we get near ENOSPC. 2020 */ 2021 #define XFS_ICSB_INO_CNTR_REENABLE 64 2022 #define XFS_ICSB_FDBLK_CNTR_REENABLE 512 2023 STATIC void 2024 xfs_icsb_balance_counter( 2025 xfs_mount_t *mp, 2026 xfs_sb_field_t field, 2027 int flags) 2028 { 2029 uint64_t count, resid = 0; 2030 int weight = num_online_cpus(); 2031 int s; 2032 2033 if (!(flags & XFS_ICSB_SB_LOCKED)) 2034 s = XFS_SB_LOCK(mp); 2035 2036 /* disable counter and sync counter */ 2037 xfs_icsb_disable_counter(mp, field); 2038 2039 /* update counters - first CPU gets residual*/ 2040 switch (field) { 2041 case XFS_SBS_ICOUNT: 2042 count = mp->m_sb.sb_icount; 2043 resid = do_div(count, weight); 2044 if (count < XFS_ICSB_INO_CNTR_REENABLE) 2045 goto out; 2046 break; 2047 case XFS_SBS_IFREE: 2048 count = mp->m_sb.sb_ifree; 2049 resid = do_div(count, weight); 2050 if (count < XFS_ICSB_INO_CNTR_REENABLE) 2051 goto out; 2052 break; 2053 case XFS_SBS_FDBLOCKS: 2054 count = mp->m_sb.sb_fdblocks; 2055 resid = do_div(count, weight); 2056 if (count < XFS_ICSB_FDBLK_CNTR_REENABLE) 2057 goto out; 2058 break; 2059 default: 2060 BUG(); 2061 break; 2062 } 2063 2064 xfs_icsb_enable_counter(mp, field, count, resid); 2065 out: 2066 if (!(flags & XFS_ICSB_SB_LOCKED)) 2067 XFS_SB_UNLOCK(mp, s); 2068 } 2069 2070 STATIC int 2071 xfs_icsb_modify_counters_int( 2072 xfs_mount_t *mp, 2073 xfs_sb_field_t field, 2074 int delta, 2075 int rsvd, 2076 int flags) 2077 { 2078 xfs_icsb_cnts_t *icsbp; 2079 long long lcounter; /* long counter for 64 bit fields */ 2080 int cpu, s, locked = 0; 2081 int ret = 0, balance_done = 0; 2082 2083 again: 2084 cpu = get_cpu(); 2085 icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu), 2086 xfs_icsb_lock_cntr(icsbp); 2087 if (unlikely(xfs_icsb_counter_disabled(mp, field))) 2088 goto slow_path; 2089 2090 switch (field) { 2091 case XFS_SBS_ICOUNT: 2092 lcounter = icsbp->icsb_icount; 2093 lcounter += delta; 2094 if (unlikely(lcounter < 0)) 2095 goto slow_path; 2096 icsbp->icsb_icount = lcounter; 2097 break; 2098 2099 case XFS_SBS_IFREE: 2100 lcounter = icsbp->icsb_ifree; 2101 lcounter += delta; 2102 if (unlikely(lcounter < 0)) 2103 goto slow_path; 2104 icsbp->icsb_ifree = lcounter; 2105 break; 2106 2107 case XFS_SBS_FDBLOCKS: 2108 BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); 2109 2110 lcounter = icsbp->icsb_fdblocks; 2111 lcounter += delta; 2112 if (unlikely(lcounter < 0)) 2113 goto slow_path; 2114 icsbp->icsb_fdblocks = lcounter; 2115 break; 2116 default: 2117 BUG(); 2118 break; 2119 } 2120 xfs_icsb_unlock_cntr(icsbp); 2121 put_cpu(); 2122 if (locked) 2123 XFS_SB_UNLOCK(mp, s); 2124 return 0; 2125 2126 /* 2127 * The slow path needs to be run with the SBLOCK 2128 * held so that we prevent other threads from 2129 * attempting to run this path at the same time. 2130 * this provides exclusion for the balancing code, 2131 * and exclusive fallback if the balance does not 2132 * provide enough resources to continue in an unlocked 2133 * manner. 2134 */ 2135 slow_path: 2136 xfs_icsb_unlock_cntr(icsbp); 2137 put_cpu(); 2138 2139 /* need to hold superblock incase we need 2140 * to disable a counter */ 2141 if (!(flags & XFS_ICSB_SB_LOCKED)) { 2142 s = XFS_SB_LOCK(mp); 2143 locked = 1; 2144 flags |= XFS_ICSB_SB_LOCKED; 2145 } 2146 if (!balance_done) { 2147 xfs_icsb_balance_counter(mp, field, flags); 2148 balance_done = 1; 2149 goto again; 2150 } else { 2151 /* 2152 * we might not have enough on this local 2153 * cpu to allocate for a bulk request. 2154 * We need to drain this field from all CPUs 2155 * and disable the counter fastpath 2156 */ 2157 xfs_icsb_disable_counter(mp, field); 2158 } 2159 2160 ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); 2161 2162 if (locked) 2163 XFS_SB_UNLOCK(mp, s); 2164 return ret; 2165 } 2166 2167 STATIC int 2168 xfs_icsb_modify_counters( 2169 xfs_mount_t *mp, 2170 xfs_sb_field_t field, 2171 int delta, 2172 int rsvd) 2173 { 2174 return xfs_icsb_modify_counters_int(mp, field, delta, rsvd, 0); 2175 } 2176 2177 /* 2178 * Called when superblock is already locked 2179 */ 2180 STATIC int 2181 xfs_icsb_modify_counters_locked( 2182 xfs_mount_t *mp, 2183 xfs_sb_field_t field, 2184 int delta, 2185 int rsvd) 2186 { 2187 return xfs_icsb_modify_counters_int(mp, field, delta, 2188 rsvd, XFS_ICSB_SB_LOCKED); 2189 } 2190 #endif 2191