1 /* 2 * Copyright (c) 2000-2006 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 19 #include "xfs.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_inode.h" 28 #include "xfs_btree.h" 29 #include "xfs_bmap.h" 30 #include "xfs_alloc.h" 31 #include "xfs_error.h" 32 #include "xfs_fsops.h" 33 #include "xfs_trans.h" 34 #include "xfs_buf_item.h" 35 #include "xfs_log.h" 36 #include "xfs_log_priv.h" 37 #include "xfs_da_btree.h" 38 #include "xfs_dir2.h" 39 #include "xfs_extfree_item.h" 40 #include "xfs_mru_cache.h" 41 #include "xfs_inode_item.h" 42 #include "xfs_icache.h" 43 #include "xfs_trace.h" 44 #include "xfs_icreate_item.h" 45 #include "xfs_filestream.h" 46 #include "xfs_quota.h" 47 #include "xfs_sysfs.h" 48 #include "xfs_ondisk.h" 49 #include "xfs_rmap_item.h" 50 51 #include <linux/namei.h> 52 #include <linux/init.h> 53 #include <linux/slab.h> 54 #include <linux/mount.h> 55 #include <linux/mempool.h> 56 #include <linux/writeback.h> 57 #include <linux/kthread.h> 58 #include <linux/freezer.h> 59 #include <linux/parser.h> 60 61 static const struct super_operations xfs_super_operations; 62 struct bio_set *xfs_ioend_bioset; 63 64 static struct kset *xfs_kset; /* top-level xfs sysfs dir */ 65 #ifdef DEBUG 66 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */ 67 #endif 68 69 /* 70 * Table driven mount option parser. 71 */ 72 enum { 73 Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev, Opt_biosize, 74 Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid, 75 Opt_mtpt, Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups, 76 Opt_allocsize, Opt_norecovery, Opt_barrier, Opt_nobarrier, 77 Opt_inode64, Opt_inode32, Opt_ikeep, Opt_noikeep, 78 Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2, Opt_filestreams, 79 Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota, 80 Opt_uquota, Opt_gquota, Opt_pquota, 81 Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce, 82 Opt_discard, Opt_nodiscard, Opt_dax, Opt_err, 83 }; 84 85 static const match_table_t tokens = { 86 {Opt_logbufs, "logbufs=%u"}, /* number of XFS log buffers */ 87 {Opt_logbsize, "logbsize=%s"}, /* size of XFS log buffers */ 88 {Opt_logdev, "logdev=%s"}, /* log device */ 89 {Opt_rtdev, "rtdev=%s"}, /* realtime I/O device */ 90 {Opt_biosize, "biosize=%u"}, /* log2 of preferred buffered io size */ 91 {Opt_wsync, "wsync"}, /* safe-mode nfs compatible mount */ 92 {Opt_noalign, "noalign"}, /* turn off stripe alignment */ 93 {Opt_swalloc, "swalloc"}, /* turn on stripe width allocation */ 94 {Opt_sunit, "sunit=%u"}, /* data volume stripe unit */ 95 {Opt_swidth, "swidth=%u"}, /* data volume stripe width */ 96 {Opt_nouuid, "nouuid"}, /* ignore filesystem UUID */ 97 {Opt_mtpt, "mtpt"}, /* filesystem mount point */ 98 {Opt_grpid, "grpid"}, /* group-ID from parent directory */ 99 {Opt_nogrpid, "nogrpid"}, /* group-ID from current process */ 100 {Opt_bsdgroups, "bsdgroups"}, /* group-ID from parent directory */ 101 {Opt_sysvgroups,"sysvgroups"}, /* group-ID from current process */ 102 {Opt_allocsize, "allocsize=%s"},/* preferred allocation size */ 103 {Opt_norecovery,"norecovery"}, /* don't run XFS recovery */ 104 {Opt_barrier, "barrier"}, /* use writer barriers for log write and 105 * unwritten extent conversion */ 106 {Opt_nobarrier, "nobarrier"}, /* .. disable */ 107 {Opt_inode64, "inode64"}, /* inodes can be allocated anywhere */ 108 {Opt_inode32, "inode32"}, /* inode allocation limited to 109 * XFS_MAXINUMBER_32 */ 110 {Opt_ikeep, "ikeep"}, /* do not free empty inode clusters */ 111 {Opt_noikeep, "noikeep"}, /* free empty inode clusters */ 112 {Opt_largeio, "largeio"}, /* report large I/O sizes in stat() */ 113 {Opt_nolargeio, "nolargeio"}, /* do not report large I/O sizes 114 * in stat(). */ 115 {Opt_attr2, "attr2"}, /* do use attr2 attribute format */ 116 {Opt_noattr2, "noattr2"}, /* do not use attr2 attribute format */ 117 {Opt_filestreams,"filestreams"},/* use filestreams allocator */ 118 {Opt_quota, "quota"}, /* disk quotas (user) */ 119 {Opt_noquota, "noquota"}, /* no quotas */ 120 {Opt_usrquota, "usrquota"}, /* user quota enabled */ 121 {Opt_grpquota, "grpquota"}, /* group quota enabled */ 122 {Opt_prjquota, "prjquota"}, /* project quota enabled */ 123 {Opt_uquota, "uquota"}, /* user quota (IRIX variant) */ 124 {Opt_gquota, "gquota"}, /* group quota (IRIX variant) */ 125 {Opt_pquota, "pquota"}, /* project quota (IRIX variant) */ 126 {Opt_uqnoenforce,"uqnoenforce"},/* user quota limit enforcement */ 127 {Opt_gqnoenforce,"gqnoenforce"},/* group quota limit enforcement */ 128 {Opt_pqnoenforce,"pqnoenforce"},/* project quota limit enforcement */ 129 {Opt_qnoenforce, "qnoenforce"}, /* same as uqnoenforce */ 130 {Opt_discard, "discard"}, /* Discard unused blocks */ 131 {Opt_nodiscard, "nodiscard"}, /* Do not discard unused blocks */ 132 133 {Opt_dax, "dax"}, /* Enable direct access to bdev pages */ 134 {Opt_err, NULL}, 135 }; 136 137 138 STATIC int 139 suffix_kstrtoint(const substring_t *s, unsigned int base, int *res) 140 { 141 int last, shift_left_factor = 0, _res; 142 char *value; 143 int ret = 0; 144 145 value = match_strdup(s); 146 if (!value) 147 return -ENOMEM; 148 149 last = strlen(value) - 1; 150 if (value[last] == 'K' || value[last] == 'k') { 151 shift_left_factor = 10; 152 value[last] = '\0'; 153 } 154 if (value[last] == 'M' || value[last] == 'm') { 155 shift_left_factor = 20; 156 value[last] = '\0'; 157 } 158 if (value[last] == 'G' || value[last] == 'g') { 159 shift_left_factor = 30; 160 value[last] = '\0'; 161 } 162 163 if (kstrtoint(value, base, &_res)) 164 ret = -EINVAL; 165 kfree(value); 166 *res = _res << shift_left_factor; 167 return ret; 168 } 169 170 /* 171 * This function fills in xfs_mount_t fields based on mount args. 172 * Note: the superblock has _not_ yet been read in. 173 * 174 * Note that this function leaks the various device name allocations on 175 * failure. The caller takes care of them. 176 * 177 * *sb is const because this is also used to test options on the remount 178 * path, and we don't want this to have any side effects at remount time. 179 * Today this function does not change *sb, but just to future-proof... 180 */ 181 STATIC int 182 xfs_parseargs( 183 struct xfs_mount *mp, 184 char *options) 185 { 186 const struct super_block *sb = mp->m_super; 187 char *p; 188 substring_t args[MAX_OPT_ARGS]; 189 int dsunit = 0; 190 int dswidth = 0; 191 int iosize = 0; 192 __uint8_t iosizelog = 0; 193 194 /* 195 * set up the mount name first so all the errors will refer to the 196 * correct device. 197 */ 198 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL); 199 if (!mp->m_fsname) 200 return -ENOMEM; 201 mp->m_fsname_len = strlen(mp->m_fsname) + 1; 202 203 /* 204 * Copy binary VFS mount flags we are interested in. 205 */ 206 if (sb->s_flags & MS_RDONLY) 207 mp->m_flags |= XFS_MOUNT_RDONLY; 208 if (sb->s_flags & MS_DIRSYNC) 209 mp->m_flags |= XFS_MOUNT_DIRSYNC; 210 if (sb->s_flags & MS_SYNCHRONOUS) 211 mp->m_flags |= XFS_MOUNT_WSYNC; 212 213 /* 214 * Set some default flags that could be cleared by the mount option 215 * parsing. 216 */ 217 mp->m_flags |= XFS_MOUNT_BARRIER; 218 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 219 220 /* 221 * These can be overridden by the mount option parsing. 222 */ 223 mp->m_logbufs = -1; 224 mp->m_logbsize = -1; 225 226 if (!options) 227 goto done; 228 229 while ((p = strsep(&options, ",")) != NULL) { 230 int token; 231 232 if (!*p) 233 continue; 234 235 token = match_token(p, tokens, args); 236 switch (token) { 237 case Opt_logbufs: 238 if (match_int(args, &mp->m_logbufs)) 239 return -EINVAL; 240 break; 241 case Opt_logbsize: 242 if (suffix_kstrtoint(args, 10, &mp->m_logbsize)) 243 return -EINVAL; 244 break; 245 case Opt_logdev: 246 mp->m_logname = match_strdup(args); 247 if (!mp->m_logname) 248 return -ENOMEM; 249 break; 250 case Opt_mtpt: 251 xfs_warn(mp, "%s option not allowed on this system", p); 252 return -EINVAL; 253 case Opt_rtdev: 254 mp->m_rtname = match_strdup(args); 255 if (!mp->m_rtname) 256 return -ENOMEM; 257 break; 258 case Opt_allocsize: 259 case Opt_biosize: 260 if (suffix_kstrtoint(args, 10, &iosize)) 261 return -EINVAL; 262 iosizelog = ffs(iosize) - 1; 263 break; 264 case Opt_grpid: 265 case Opt_bsdgroups: 266 mp->m_flags |= XFS_MOUNT_GRPID; 267 break; 268 case Opt_nogrpid: 269 case Opt_sysvgroups: 270 mp->m_flags &= ~XFS_MOUNT_GRPID; 271 break; 272 case Opt_wsync: 273 mp->m_flags |= XFS_MOUNT_WSYNC; 274 break; 275 case Opt_norecovery: 276 mp->m_flags |= XFS_MOUNT_NORECOVERY; 277 break; 278 case Opt_noalign: 279 mp->m_flags |= XFS_MOUNT_NOALIGN; 280 break; 281 case Opt_swalloc: 282 mp->m_flags |= XFS_MOUNT_SWALLOC; 283 break; 284 case Opt_sunit: 285 if (match_int(args, &dsunit)) 286 return -EINVAL; 287 break; 288 case Opt_swidth: 289 if (match_int(args, &dswidth)) 290 return -EINVAL; 291 break; 292 case Opt_inode32: 293 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 294 break; 295 case Opt_inode64: 296 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 297 break; 298 case Opt_nouuid: 299 mp->m_flags |= XFS_MOUNT_NOUUID; 300 break; 301 case Opt_barrier: 302 mp->m_flags |= XFS_MOUNT_BARRIER; 303 break; 304 case Opt_nobarrier: 305 mp->m_flags &= ~XFS_MOUNT_BARRIER; 306 break; 307 case Opt_ikeep: 308 mp->m_flags |= XFS_MOUNT_IKEEP; 309 break; 310 case Opt_noikeep: 311 mp->m_flags &= ~XFS_MOUNT_IKEEP; 312 break; 313 case Opt_largeio: 314 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 315 break; 316 case Opt_nolargeio: 317 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 318 break; 319 case Opt_attr2: 320 mp->m_flags |= XFS_MOUNT_ATTR2; 321 break; 322 case Opt_noattr2: 323 mp->m_flags &= ~XFS_MOUNT_ATTR2; 324 mp->m_flags |= XFS_MOUNT_NOATTR2; 325 break; 326 case Opt_filestreams: 327 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 328 break; 329 case Opt_noquota: 330 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 331 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 332 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 333 break; 334 case Opt_quota: 335 case Opt_uquota: 336 case Opt_usrquota: 337 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 338 XFS_UQUOTA_ENFD); 339 break; 340 case Opt_qnoenforce: 341 case Opt_uqnoenforce: 342 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 343 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 344 break; 345 case Opt_pquota: 346 case Opt_prjquota: 347 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 348 XFS_PQUOTA_ENFD); 349 break; 350 case Opt_pqnoenforce: 351 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 352 mp->m_qflags &= ~XFS_PQUOTA_ENFD; 353 break; 354 case Opt_gquota: 355 case Opt_grpquota: 356 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 357 XFS_GQUOTA_ENFD); 358 break; 359 case Opt_gqnoenforce: 360 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 361 mp->m_qflags &= ~XFS_GQUOTA_ENFD; 362 break; 363 case Opt_discard: 364 mp->m_flags |= XFS_MOUNT_DISCARD; 365 break; 366 case Opt_nodiscard: 367 mp->m_flags &= ~XFS_MOUNT_DISCARD; 368 break; 369 #ifdef CONFIG_FS_DAX 370 case Opt_dax: 371 mp->m_flags |= XFS_MOUNT_DAX; 372 break; 373 #endif 374 default: 375 xfs_warn(mp, "unknown mount option [%s].", p); 376 return -EINVAL; 377 } 378 } 379 380 /* 381 * no recovery flag requires a read-only mount 382 */ 383 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 384 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 385 xfs_warn(mp, "no-recovery mounts must be read-only."); 386 return -EINVAL; 387 } 388 389 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 390 xfs_warn(mp, 391 "sunit and swidth options incompatible with the noalign option"); 392 return -EINVAL; 393 } 394 395 #ifndef CONFIG_XFS_QUOTA 396 if (XFS_IS_QUOTA_RUNNING(mp)) { 397 xfs_warn(mp, "quota support not available in this kernel."); 398 return -EINVAL; 399 } 400 #endif 401 402 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 403 xfs_warn(mp, "sunit and swidth must be specified together"); 404 return -EINVAL; 405 } 406 407 if (dsunit && (dswidth % dsunit != 0)) { 408 xfs_warn(mp, 409 "stripe width (%d) must be a multiple of the stripe unit (%d)", 410 dswidth, dsunit); 411 return -EINVAL; 412 } 413 414 done: 415 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) { 416 /* 417 * At this point the superblock has not been read 418 * in, therefore we do not know the block size. 419 * Before the mount call ends we will convert 420 * these to FSBs. 421 */ 422 mp->m_dalign = dsunit; 423 mp->m_swidth = dswidth; 424 } 425 426 if (mp->m_logbufs != -1 && 427 mp->m_logbufs != 0 && 428 (mp->m_logbufs < XLOG_MIN_ICLOGS || 429 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 430 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 431 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 432 return -EINVAL; 433 } 434 if (mp->m_logbsize != -1 && 435 mp->m_logbsize != 0 && 436 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 437 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 438 !is_power_of_2(mp->m_logbsize))) { 439 xfs_warn(mp, 440 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 441 mp->m_logbsize); 442 return -EINVAL; 443 } 444 445 if (iosizelog) { 446 if (iosizelog > XFS_MAX_IO_LOG || 447 iosizelog < XFS_MIN_IO_LOG) { 448 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 449 iosizelog, XFS_MIN_IO_LOG, 450 XFS_MAX_IO_LOG); 451 return -EINVAL; 452 } 453 454 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 455 mp->m_readio_log = iosizelog; 456 mp->m_writeio_log = iosizelog; 457 } 458 459 return 0; 460 } 461 462 struct proc_xfs_info { 463 uint64_t flag; 464 char *str; 465 }; 466 467 STATIC int 468 xfs_showargs( 469 struct xfs_mount *mp, 470 struct seq_file *m) 471 { 472 static struct proc_xfs_info xfs_info_set[] = { 473 /* the few simple ones we can get from the mount struct */ 474 { XFS_MOUNT_IKEEP, ",ikeep" }, 475 { XFS_MOUNT_WSYNC, ",wsync" }, 476 { XFS_MOUNT_NOALIGN, ",noalign" }, 477 { XFS_MOUNT_SWALLOC, ",swalloc" }, 478 { XFS_MOUNT_NOUUID, ",nouuid" }, 479 { XFS_MOUNT_NORECOVERY, ",norecovery" }, 480 { XFS_MOUNT_ATTR2, ",attr2" }, 481 { XFS_MOUNT_FILESTREAMS, ",filestreams" }, 482 { XFS_MOUNT_GRPID, ",grpid" }, 483 { XFS_MOUNT_DISCARD, ",discard" }, 484 { XFS_MOUNT_SMALL_INUMS, ",inode32" }, 485 { XFS_MOUNT_DAX, ",dax" }, 486 { 0, NULL } 487 }; 488 static struct proc_xfs_info xfs_info_unset[] = { 489 /* the few simple ones we can get from the mount struct */ 490 { XFS_MOUNT_COMPAT_IOSIZE, ",largeio" }, 491 { XFS_MOUNT_BARRIER, ",nobarrier" }, 492 { XFS_MOUNT_SMALL_INUMS, ",inode64" }, 493 { 0, NULL } 494 }; 495 struct proc_xfs_info *xfs_infop; 496 497 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { 498 if (mp->m_flags & xfs_infop->flag) 499 seq_puts(m, xfs_infop->str); 500 } 501 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) { 502 if (!(mp->m_flags & xfs_infop->flag)) 503 seq_puts(m, xfs_infop->str); 504 } 505 506 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) 507 seq_printf(m, ",allocsize=%dk", 508 (int)(1 << mp->m_writeio_log) >> 10); 509 510 if (mp->m_logbufs > 0) 511 seq_printf(m, ",logbufs=%d", mp->m_logbufs); 512 if (mp->m_logbsize > 0) 513 seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10); 514 515 if (mp->m_logname) 516 seq_show_option(m, "logdev", mp->m_logname); 517 if (mp->m_rtname) 518 seq_show_option(m, "rtdev", mp->m_rtname); 519 520 if (mp->m_dalign > 0) 521 seq_printf(m, ",sunit=%d", 522 (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); 523 if (mp->m_swidth > 0) 524 seq_printf(m, ",swidth=%d", 525 (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); 526 527 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD)) 528 seq_puts(m, ",usrquota"); 529 else if (mp->m_qflags & XFS_UQUOTA_ACCT) 530 seq_puts(m, ",uqnoenforce"); 531 532 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 533 if (mp->m_qflags & XFS_PQUOTA_ENFD) 534 seq_puts(m, ",prjquota"); 535 else 536 seq_puts(m, ",pqnoenforce"); 537 } 538 if (mp->m_qflags & XFS_GQUOTA_ACCT) { 539 if (mp->m_qflags & XFS_GQUOTA_ENFD) 540 seq_puts(m, ",grpquota"); 541 else 542 seq_puts(m, ",gqnoenforce"); 543 } 544 545 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 546 seq_puts(m, ",noquota"); 547 548 return 0; 549 } 550 static __uint64_t 551 xfs_max_file_offset( 552 unsigned int blockshift) 553 { 554 unsigned int pagefactor = 1; 555 unsigned int bitshift = BITS_PER_LONG - 1; 556 557 /* Figure out maximum filesize, on Linux this can depend on 558 * the filesystem blocksize (on 32 bit platforms). 559 * __block_write_begin does this in an [unsigned] long... 560 * page->index << (PAGE_SHIFT - bbits) 561 * So, for page sized blocks (4K on 32 bit platforms), 562 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 563 * (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1) 564 * but for smaller blocksizes it is less (bbits = log2 bsize). 565 * Note1: get_block_t takes a long (implicit cast from above) 566 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 567 * can optionally convert the [unsigned] long from above into 568 * an [unsigned] long long. 569 */ 570 571 #if BITS_PER_LONG == 32 572 # if defined(CONFIG_LBDAF) 573 ASSERT(sizeof(sector_t) == 8); 574 pagefactor = PAGE_SIZE; 575 bitshift = BITS_PER_LONG; 576 # else 577 pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift); 578 # endif 579 #endif 580 581 return (((__uint64_t)pagefactor) << bitshift) - 1; 582 } 583 584 /* 585 * Set parameters for inode allocation heuristics, taking into account 586 * filesystem size and inode32/inode64 mount options; i.e. specifically 587 * whether or not XFS_MOUNT_SMALL_INUMS is set. 588 * 589 * Inode allocation patterns are altered only if inode32 is requested 590 * (XFS_MOUNT_SMALL_INUMS), and the filesystem is sufficiently large. 591 * If altered, XFS_MOUNT_32BITINODES is set as well. 592 * 593 * An agcount independent of that in the mount structure is provided 594 * because in the growfs case, mp->m_sb.sb_agcount is not yet updated 595 * to the potentially higher ag count. 596 * 597 * Returns the maximum AG index which may contain inodes. 598 */ 599 xfs_agnumber_t 600 xfs_set_inode_alloc( 601 struct xfs_mount *mp, 602 xfs_agnumber_t agcount) 603 { 604 xfs_agnumber_t index; 605 xfs_agnumber_t maxagi = 0; 606 xfs_sb_t *sbp = &mp->m_sb; 607 xfs_agnumber_t max_metadata; 608 xfs_agino_t agino; 609 xfs_ino_t ino; 610 611 /* 612 * Calculate how much should be reserved for inodes to meet 613 * the max inode percentage. Used only for inode32. 614 */ 615 if (mp->m_maxicount) { 616 __uint64_t icount; 617 618 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 619 do_div(icount, 100); 620 icount += sbp->sb_agblocks - 1; 621 do_div(icount, sbp->sb_agblocks); 622 max_metadata = icount; 623 } else { 624 max_metadata = agcount; 625 } 626 627 /* Get the last possible inode in the filesystem */ 628 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); 629 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); 630 631 /* 632 * If user asked for no more than 32-bit inodes, and the fs is 633 * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter 634 * the allocator to accommodate the request. 635 */ 636 if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) 637 mp->m_flags |= XFS_MOUNT_32BITINODES; 638 else 639 mp->m_flags &= ~XFS_MOUNT_32BITINODES; 640 641 for (index = 0; index < agcount; index++) { 642 struct xfs_perag *pag; 643 644 ino = XFS_AGINO_TO_INO(mp, index, agino); 645 646 pag = xfs_perag_get(mp, index); 647 648 if (mp->m_flags & XFS_MOUNT_32BITINODES) { 649 if (ino > XFS_MAXINUMBER_32) { 650 pag->pagi_inodeok = 0; 651 pag->pagf_metadata = 0; 652 } else { 653 pag->pagi_inodeok = 1; 654 maxagi++; 655 if (index < max_metadata) 656 pag->pagf_metadata = 1; 657 else 658 pag->pagf_metadata = 0; 659 } 660 } else { 661 pag->pagi_inodeok = 1; 662 pag->pagf_metadata = 0; 663 } 664 665 xfs_perag_put(pag); 666 } 667 668 return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount; 669 } 670 671 STATIC int 672 xfs_blkdev_get( 673 xfs_mount_t *mp, 674 const char *name, 675 struct block_device **bdevp) 676 { 677 int error = 0; 678 679 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 680 mp); 681 if (IS_ERR(*bdevp)) { 682 error = PTR_ERR(*bdevp); 683 xfs_warn(mp, "Invalid device [%s], error=%d", name, error); 684 } 685 686 return error; 687 } 688 689 STATIC void 690 xfs_blkdev_put( 691 struct block_device *bdev) 692 { 693 if (bdev) 694 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 695 } 696 697 void 698 xfs_blkdev_issue_flush( 699 xfs_buftarg_t *buftarg) 700 { 701 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 702 } 703 704 STATIC void 705 xfs_close_devices( 706 struct xfs_mount *mp) 707 { 708 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 709 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 710 xfs_free_buftarg(mp, mp->m_logdev_targp); 711 xfs_blkdev_put(logdev); 712 } 713 if (mp->m_rtdev_targp) { 714 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 715 xfs_free_buftarg(mp, mp->m_rtdev_targp); 716 xfs_blkdev_put(rtdev); 717 } 718 xfs_free_buftarg(mp, mp->m_ddev_targp); 719 } 720 721 /* 722 * The file system configurations are: 723 * (1) device (partition) with data and internal log 724 * (2) logical volume with data and log subvolumes. 725 * (3) logical volume with data, log, and realtime subvolumes. 726 * 727 * We only have to handle opening the log and realtime volumes here if 728 * they are present. The data subvolume has already been opened by 729 * get_sb_bdev() and is stored in sb->s_bdev. 730 */ 731 STATIC int 732 xfs_open_devices( 733 struct xfs_mount *mp) 734 { 735 struct block_device *ddev = mp->m_super->s_bdev; 736 struct block_device *logdev = NULL, *rtdev = NULL; 737 int error; 738 739 /* 740 * Open real time and log devices - order is important. 741 */ 742 if (mp->m_logname) { 743 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 744 if (error) 745 goto out; 746 } 747 748 if (mp->m_rtname) { 749 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 750 if (error) 751 goto out_close_logdev; 752 753 if (rtdev == ddev || rtdev == logdev) { 754 xfs_warn(mp, 755 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 756 error = -EINVAL; 757 goto out_close_rtdev; 758 } 759 } 760 761 /* 762 * Setup xfs_mount buffer target pointers 763 */ 764 error = -ENOMEM; 765 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev); 766 if (!mp->m_ddev_targp) 767 goto out_close_rtdev; 768 769 if (rtdev) { 770 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev); 771 if (!mp->m_rtdev_targp) 772 goto out_free_ddev_targ; 773 } 774 775 if (logdev && logdev != ddev) { 776 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev); 777 if (!mp->m_logdev_targp) 778 goto out_free_rtdev_targ; 779 } else { 780 mp->m_logdev_targp = mp->m_ddev_targp; 781 } 782 783 return 0; 784 785 out_free_rtdev_targ: 786 if (mp->m_rtdev_targp) 787 xfs_free_buftarg(mp, mp->m_rtdev_targp); 788 out_free_ddev_targ: 789 xfs_free_buftarg(mp, mp->m_ddev_targp); 790 out_close_rtdev: 791 xfs_blkdev_put(rtdev); 792 out_close_logdev: 793 if (logdev && logdev != ddev) 794 xfs_blkdev_put(logdev); 795 out: 796 return error; 797 } 798 799 /* 800 * Setup xfs_mount buffer target pointers based on superblock 801 */ 802 STATIC int 803 xfs_setup_devices( 804 struct xfs_mount *mp) 805 { 806 int error; 807 808 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize); 809 if (error) 810 return error; 811 812 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 813 unsigned int log_sector_size = BBSIZE; 814 815 if (xfs_sb_version_hassector(&mp->m_sb)) 816 log_sector_size = mp->m_sb.sb_logsectsize; 817 error = xfs_setsize_buftarg(mp->m_logdev_targp, 818 log_sector_size); 819 if (error) 820 return error; 821 } 822 if (mp->m_rtdev_targp) { 823 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 824 mp->m_sb.sb_sectsize); 825 if (error) 826 return error; 827 } 828 829 return 0; 830 } 831 832 STATIC int 833 xfs_init_mount_workqueues( 834 struct xfs_mount *mp) 835 { 836 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s", 837 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname); 838 if (!mp->m_buf_workqueue) 839 goto out; 840 841 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 842 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 843 if (!mp->m_data_workqueue) 844 goto out_destroy_buf; 845 846 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 847 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 848 if (!mp->m_unwritten_workqueue) 849 goto out_destroy_data_iodone_queue; 850 851 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 852 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 853 if (!mp->m_cil_workqueue) 854 goto out_destroy_unwritten; 855 856 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s", 857 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 858 if (!mp->m_reclaim_workqueue) 859 goto out_destroy_cil; 860 861 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s", 862 WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0, 863 mp->m_fsname); 864 if (!mp->m_log_workqueue) 865 goto out_destroy_reclaim; 866 867 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s", 868 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 869 if (!mp->m_eofblocks_workqueue) 870 goto out_destroy_log; 871 872 return 0; 873 874 out_destroy_log: 875 destroy_workqueue(mp->m_log_workqueue); 876 out_destroy_reclaim: 877 destroy_workqueue(mp->m_reclaim_workqueue); 878 out_destroy_cil: 879 destroy_workqueue(mp->m_cil_workqueue); 880 out_destroy_unwritten: 881 destroy_workqueue(mp->m_unwritten_workqueue); 882 out_destroy_data_iodone_queue: 883 destroy_workqueue(mp->m_data_workqueue); 884 out_destroy_buf: 885 destroy_workqueue(mp->m_buf_workqueue); 886 out: 887 return -ENOMEM; 888 } 889 890 STATIC void 891 xfs_destroy_mount_workqueues( 892 struct xfs_mount *mp) 893 { 894 destroy_workqueue(mp->m_eofblocks_workqueue); 895 destroy_workqueue(mp->m_log_workqueue); 896 destroy_workqueue(mp->m_reclaim_workqueue); 897 destroy_workqueue(mp->m_cil_workqueue); 898 destroy_workqueue(mp->m_data_workqueue); 899 destroy_workqueue(mp->m_unwritten_workqueue); 900 destroy_workqueue(mp->m_buf_workqueue); 901 } 902 903 /* 904 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK 905 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting 906 * for IO to complete so that we effectively throttle multiple callers to the 907 * rate at which IO is completing. 908 */ 909 void 910 xfs_flush_inodes( 911 struct xfs_mount *mp) 912 { 913 struct super_block *sb = mp->m_super; 914 915 if (down_read_trylock(&sb->s_umount)) { 916 sync_inodes_sb(sb); 917 up_read(&sb->s_umount); 918 } 919 } 920 921 /* Catch misguided souls that try to use this interface on XFS */ 922 STATIC struct inode * 923 xfs_fs_alloc_inode( 924 struct super_block *sb) 925 { 926 BUG(); 927 return NULL; 928 } 929 930 /* 931 * Now that the generic code is guaranteed not to be accessing 932 * the linux inode, we can inactivate and reclaim the inode. 933 */ 934 STATIC void 935 xfs_fs_destroy_inode( 936 struct inode *inode) 937 { 938 struct xfs_inode *ip = XFS_I(inode); 939 940 trace_xfs_destroy_inode(ip); 941 942 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 943 XFS_STATS_INC(ip->i_mount, vn_rele); 944 XFS_STATS_INC(ip->i_mount, vn_remove); 945 946 xfs_inactive(ip); 947 948 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 949 XFS_STATS_INC(ip->i_mount, vn_reclaim); 950 951 /* 952 * We should never get here with one of the reclaim flags already set. 953 */ 954 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 955 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 956 957 /* 958 * We always use background reclaim here because even if the 959 * inode is clean, it still may be under IO and hence we have 960 * to take the flush lock. The background reclaim path handles 961 * this more efficiently than we can here, so simply let background 962 * reclaim tear down all inodes. 963 */ 964 xfs_inode_set_reclaim_tag(ip); 965 } 966 967 /* 968 * Slab object creation initialisation for the XFS inode. 969 * This covers only the idempotent fields in the XFS inode; 970 * all other fields need to be initialised on allocation 971 * from the slab. This avoids the need to repeatedly initialise 972 * fields in the xfs inode that left in the initialise state 973 * when freeing the inode. 974 */ 975 STATIC void 976 xfs_fs_inode_init_once( 977 void *inode) 978 { 979 struct xfs_inode *ip = inode; 980 981 memset(ip, 0, sizeof(struct xfs_inode)); 982 983 /* vfs inode */ 984 inode_init_once(VFS_I(ip)); 985 986 /* xfs inode */ 987 atomic_set(&ip->i_pincount, 0); 988 spin_lock_init(&ip->i_flags_lock); 989 990 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 991 "xfsino", ip->i_ino); 992 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 993 "xfsino", ip->i_ino); 994 } 995 996 /* 997 * We do an unlocked check for XFS_IDONTCACHE here because we are already 998 * serialised against cache hits here via the inode->i_lock and igrab() in 999 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 1000 * racing with us, and it avoids needing to grab a spinlock here for every inode 1001 * we drop the final reference on. 1002 */ 1003 STATIC int 1004 xfs_fs_drop_inode( 1005 struct inode *inode) 1006 { 1007 struct xfs_inode *ip = XFS_I(inode); 1008 1009 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 1010 } 1011 1012 STATIC void 1013 xfs_free_fsname( 1014 struct xfs_mount *mp) 1015 { 1016 kfree(mp->m_fsname); 1017 kfree(mp->m_rtname); 1018 kfree(mp->m_logname); 1019 } 1020 1021 STATIC int 1022 xfs_fs_sync_fs( 1023 struct super_block *sb, 1024 int wait) 1025 { 1026 struct xfs_mount *mp = XFS_M(sb); 1027 1028 /* 1029 * Doing anything during the async pass would be counterproductive. 1030 */ 1031 if (!wait) 1032 return 0; 1033 1034 xfs_log_force(mp, XFS_LOG_SYNC); 1035 if (laptop_mode) { 1036 /* 1037 * The disk must be active because we're syncing. 1038 * We schedule log work now (now that the disk is 1039 * active) instead of later (when it might not be). 1040 */ 1041 flush_delayed_work(&mp->m_log->l_work); 1042 } 1043 1044 return 0; 1045 } 1046 1047 STATIC int 1048 xfs_fs_statfs( 1049 struct dentry *dentry, 1050 struct kstatfs *statp) 1051 { 1052 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1053 xfs_sb_t *sbp = &mp->m_sb; 1054 struct xfs_inode *ip = XFS_I(d_inode(dentry)); 1055 __uint64_t fakeinos, id; 1056 __uint64_t icount; 1057 __uint64_t ifree; 1058 __uint64_t fdblocks; 1059 xfs_extlen_t lsize; 1060 __int64_t ffree; 1061 1062 statp->f_type = XFS_SB_MAGIC; 1063 statp->f_namelen = MAXNAMELEN - 1; 1064 1065 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1066 statp->f_fsid.val[0] = (u32)id; 1067 statp->f_fsid.val[1] = (u32)(id >> 32); 1068 1069 icount = percpu_counter_sum(&mp->m_icount); 1070 ifree = percpu_counter_sum(&mp->m_ifree); 1071 fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1072 1073 spin_lock(&mp->m_sb_lock); 1074 statp->f_bsize = sbp->sb_blocksize; 1075 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1076 statp->f_blocks = sbp->sb_dblocks - lsize; 1077 spin_unlock(&mp->m_sb_lock); 1078 1079 statp->f_bfree = fdblocks - mp->m_alloc_set_aside; 1080 statp->f_bavail = statp->f_bfree; 1081 1082 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1083 statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1084 if (mp->m_maxicount) 1085 statp->f_files = min_t(typeof(statp->f_files), 1086 statp->f_files, 1087 mp->m_maxicount); 1088 1089 /* If sb_icount overshot maxicount, report actual allocation */ 1090 statp->f_files = max_t(typeof(statp->f_files), 1091 statp->f_files, 1092 sbp->sb_icount); 1093 1094 /* make sure statp->f_ffree does not underflow */ 1095 ffree = statp->f_files - (icount - ifree); 1096 statp->f_ffree = max_t(__int64_t, ffree, 0); 1097 1098 1099 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1100 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) == 1101 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD)) 1102 xfs_qm_statvfs(ip, statp); 1103 return 0; 1104 } 1105 1106 STATIC void 1107 xfs_save_resvblks(struct xfs_mount *mp) 1108 { 1109 __uint64_t resblks = 0; 1110 1111 mp->m_resblks_save = mp->m_resblks; 1112 xfs_reserve_blocks(mp, &resblks, NULL); 1113 } 1114 1115 STATIC void 1116 xfs_restore_resvblks(struct xfs_mount *mp) 1117 { 1118 __uint64_t resblks; 1119 1120 if (mp->m_resblks_save) { 1121 resblks = mp->m_resblks_save; 1122 mp->m_resblks_save = 0; 1123 } else 1124 resblks = xfs_default_resblks(mp); 1125 1126 xfs_reserve_blocks(mp, &resblks, NULL); 1127 } 1128 1129 /* 1130 * Trigger writeback of all the dirty metadata in the file system. 1131 * 1132 * This ensures that the metadata is written to their location on disk rather 1133 * than just existing in transactions in the log. This means after a quiesce 1134 * there is no log replay required to write the inodes to disk - this is the 1135 * primary difference between a sync and a quiesce. 1136 * 1137 * Note: xfs_log_quiesce() stops background log work - the callers must ensure 1138 * it is started again when appropriate. 1139 */ 1140 static void 1141 xfs_quiesce_attr( 1142 struct xfs_mount *mp) 1143 { 1144 int error = 0; 1145 1146 /* wait for all modifications to complete */ 1147 while (atomic_read(&mp->m_active_trans) > 0) 1148 delay(100); 1149 1150 /* force the log to unpin objects from the now complete transactions */ 1151 xfs_log_force(mp, XFS_LOG_SYNC); 1152 1153 /* reclaim inodes to do any IO before the freeze completes */ 1154 xfs_reclaim_inodes(mp, 0); 1155 xfs_reclaim_inodes(mp, SYNC_WAIT); 1156 1157 /* Push the superblock and write an unmount record */ 1158 error = xfs_log_sbcount(mp); 1159 if (error) 1160 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. " 1161 "Frozen image may not be consistent."); 1162 /* 1163 * Just warn here till VFS can correctly support 1164 * read-only remount without racing. 1165 */ 1166 WARN_ON(atomic_read(&mp->m_active_trans) != 0); 1167 1168 xfs_log_quiesce(mp); 1169 } 1170 1171 STATIC int 1172 xfs_test_remount_options( 1173 struct super_block *sb, 1174 struct xfs_mount *mp, 1175 char *options) 1176 { 1177 int error = 0; 1178 struct xfs_mount *tmp_mp; 1179 1180 tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL); 1181 if (!tmp_mp) 1182 return -ENOMEM; 1183 1184 tmp_mp->m_super = sb; 1185 error = xfs_parseargs(tmp_mp, options); 1186 xfs_free_fsname(tmp_mp); 1187 kfree(tmp_mp); 1188 1189 return error; 1190 } 1191 1192 STATIC int 1193 xfs_fs_remount( 1194 struct super_block *sb, 1195 int *flags, 1196 char *options) 1197 { 1198 struct xfs_mount *mp = XFS_M(sb); 1199 xfs_sb_t *sbp = &mp->m_sb; 1200 substring_t args[MAX_OPT_ARGS]; 1201 char *p; 1202 int error; 1203 1204 /* First, check for complete junk; i.e. invalid options */ 1205 error = xfs_test_remount_options(sb, mp, options); 1206 if (error) 1207 return error; 1208 1209 sync_filesystem(sb); 1210 while ((p = strsep(&options, ",")) != NULL) { 1211 int token; 1212 1213 if (!*p) 1214 continue; 1215 1216 token = match_token(p, tokens, args); 1217 switch (token) { 1218 case Opt_barrier: 1219 mp->m_flags |= XFS_MOUNT_BARRIER; 1220 break; 1221 case Opt_nobarrier: 1222 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1223 break; 1224 case Opt_inode64: 1225 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 1226 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount); 1227 break; 1228 case Opt_inode32: 1229 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 1230 mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount); 1231 break; 1232 default: 1233 /* 1234 * Logically we would return an error here to prevent 1235 * users from believing they might have changed 1236 * mount options using remount which can't be changed. 1237 * 1238 * But unfortunately mount(8) adds all options from 1239 * mtab and fstab to the mount arguments in some cases 1240 * so we can't blindly reject options, but have to 1241 * check for each specified option if it actually 1242 * differs from the currently set option and only 1243 * reject it if that's the case. 1244 * 1245 * Until that is implemented we return success for 1246 * every remount request, and silently ignore all 1247 * options that we can't actually change. 1248 */ 1249 #if 0 1250 xfs_info(mp, 1251 "mount option \"%s\" not supported for remount", p); 1252 return -EINVAL; 1253 #else 1254 break; 1255 #endif 1256 } 1257 } 1258 1259 /* ro -> rw */ 1260 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1261 if (mp->m_flags & XFS_MOUNT_NORECOVERY) { 1262 xfs_warn(mp, 1263 "ro->rw transition prohibited on norecovery mount"); 1264 return -EINVAL; 1265 } 1266 1267 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 1268 xfs_sb_has_ro_compat_feature(sbp, 1269 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { 1270 xfs_warn(mp, 1271 "ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem", 1272 (sbp->sb_features_ro_compat & 1273 XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); 1274 return -EINVAL; 1275 } 1276 1277 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1278 1279 /* 1280 * If this is the first remount to writeable state we 1281 * might have some superblock changes to update. 1282 */ 1283 if (mp->m_update_sb) { 1284 error = xfs_sync_sb(mp, false); 1285 if (error) { 1286 xfs_warn(mp, "failed to write sb changes"); 1287 return error; 1288 } 1289 mp->m_update_sb = false; 1290 } 1291 1292 /* 1293 * Fill out the reserve pool if it is empty. Use the stashed 1294 * value if it is non-zero, otherwise go with the default. 1295 */ 1296 xfs_restore_resvblks(mp); 1297 xfs_log_work_queue(mp); 1298 xfs_queue_eofblocks(mp); 1299 } 1300 1301 /* rw -> ro */ 1302 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1303 /* 1304 * Before we sync the metadata, we need to free up the reserve 1305 * block pool so that the used block count in the superblock on 1306 * disk is correct at the end of the remount. Stash the current 1307 * reserve pool size so that if we get remounted rw, we can 1308 * return it to the same size. 1309 */ 1310 xfs_save_resvblks(mp); 1311 1312 /* 1313 * Cancel background eofb scanning so it cannot race with the 1314 * final log force+buftarg wait and deadlock the remount. 1315 */ 1316 cancel_delayed_work_sync(&mp->m_eofblocks_work); 1317 1318 xfs_quiesce_attr(mp); 1319 mp->m_flags |= XFS_MOUNT_RDONLY; 1320 } 1321 1322 return 0; 1323 } 1324 1325 /* 1326 * Second stage of a freeze. The data is already frozen so we only 1327 * need to take care of the metadata. Once that's done sync the superblock 1328 * to the log to dirty it in case of a crash while frozen. This ensures that we 1329 * will recover the unlinked inode lists on the next mount. 1330 */ 1331 STATIC int 1332 xfs_fs_freeze( 1333 struct super_block *sb) 1334 { 1335 struct xfs_mount *mp = XFS_M(sb); 1336 1337 xfs_save_resvblks(mp); 1338 xfs_quiesce_attr(mp); 1339 return xfs_sync_sb(mp, true); 1340 } 1341 1342 STATIC int 1343 xfs_fs_unfreeze( 1344 struct super_block *sb) 1345 { 1346 struct xfs_mount *mp = XFS_M(sb); 1347 1348 xfs_restore_resvblks(mp); 1349 xfs_log_work_queue(mp); 1350 return 0; 1351 } 1352 1353 STATIC int 1354 xfs_fs_show_options( 1355 struct seq_file *m, 1356 struct dentry *root) 1357 { 1358 return xfs_showargs(XFS_M(root->d_sb), m); 1359 } 1360 1361 /* 1362 * This function fills in xfs_mount_t fields based on mount args. 1363 * Note: the superblock _has_ now been read in. 1364 */ 1365 STATIC int 1366 xfs_finish_flags( 1367 struct xfs_mount *mp) 1368 { 1369 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1370 1371 /* Fail a mount where the logbuf is smaller than the log stripe */ 1372 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1373 if (mp->m_logbsize <= 0 && 1374 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1375 mp->m_logbsize = mp->m_sb.sb_logsunit; 1376 } else if (mp->m_logbsize > 0 && 1377 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1378 xfs_warn(mp, 1379 "logbuf size must be greater than or equal to log stripe size"); 1380 return -EINVAL; 1381 } 1382 } else { 1383 /* Fail a mount if the logbuf is larger than 32K */ 1384 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1385 xfs_warn(mp, 1386 "logbuf size for version 1 logs must be 16K or 32K"); 1387 return -EINVAL; 1388 } 1389 } 1390 1391 /* 1392 * V5 filesystems always use attr2 format for attributes. 1393 */ 1394 if (xfs_sb_version_hascrc(&mp->m_sb) && 1395 (mp->m_flags & XFS_MOUNT_NOATTR2)) { 1396 xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. " 1397 "attr2 is always enabled for V5 filesystems."); 1398 return -EINVAL; 1399 } 1400 1401 /* 1402 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1403 * told by noattr2 to turn it off 1404 */ 1405 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1406 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1407 mp->m_flags |= XFS_MOUNT_ATTR2; 1408 1409 /* 1410 * prohibit r/w mounts of read-only filesystems 1411 */ 1412 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1413 xfs_warn(mp, 1414 "cannot mount a read-only filesystem as read-write"); 1415 return -EROFS; 1416 } 1417 1418 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 1419 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) && 1420 !xfs_sb_version_has_pquotino(&mp->m_sb)) { 1421 xfs_warn(mp, 1422 "Super block does not support project and group quota together"); 1423 return -EINVAL; 1424 } 1425 1426 return 0; 1427 } 1428 1429 static int 1430 xfs_init_percpu_counters( 1431 struct xfs_mount *mp) 1432 { 1433 int error; 1434 1435 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL); 1436 if (error) 1437 return -ENOMEM; 1438 1439 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL); 1440 if (error) 1441 goto free_icount; 1442 1443 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL); 1444 if (error) 1445 goto free_ifree; 1446 1447 return 0; 1448 1449 free_ifree: 1450 percpu_counter_destroy(&mp->m_ifree); 1451 free_icount: 1452 percpu_counter_destroy(&mp->m_icount); 1453 return -ENOMEM; 1454 } 1455 1456 void 1457 xfs_reinit_percpu_counters( 1458 struct xfs_mount *mp) 1459 { 1460 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount); 1461 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree); 1462 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks); 1463 } 1464 1465 static void 1466 xfs_destroy_percpu_counters( 1467 struct xfs_mount *mp) 1468 { 1469 percpu_counter_destroy(&mp->m_icount); 1470 percpu_counter_destroy(&mp->m_ifree); 1471 percpu_counter_destroy(&mp->m_fdblocks); 1472 } 1473 1474 STATIC int 1475 xfs_fs_fill_super( 1476 struct super_block *sb, 1477 void *data, 1478 int silent) 1479 { 1480 struct inode *root; 1481 struct xfs_mount *mp = NULL; 1482 int flags = 0, error = -ENOMEM; 1483 1484 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1485 if (!mp) 1486 goto out; 1487 1488 spin_lock_init(&mp->m_sb_lock); 1489 mutex_init(&mp->m_growlock); 1490 atomic_set(&mp->m_active_trans, 0); 1491 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); 1492 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker); 1493 mp->m_kobj.kobject.kset = xfs_kset; 1494 1495 mp->m_super = sb; 1496 sb->s_fs_info = mp; 1497 1498 error = xfs_parseargs(mp, (char *)data); 1499 if (error) 1500 goto out_free_fsname; 1501 1502 sb_min_blocksize(sb, BBSIZE); 1503 sb->s_xattr = xfs_xattr_handlers; 1504 sb->s_export_op = &xfs_export_operations; 1505 #ifdef CONFIG_XFS_QUOTA 1506 sb->s_qcop = &xfs_quotactl_operations; 1507 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 1508 #endif 1509 sb->s_op = &xfs_super_operations; 1510 1511 if (silent) 1512 flags |= XFS_MFSI_QUIET; 1513 1514 error = xfs_open_devices(mp); 1515 if (error) 1516 goto out_free_fsname; 1517 1518 error = xfs_init_mount_workqueues(mp); 1519 if (error) 1520 goto out_close_devices; 1521 1522 error = xfs_init_percpu_counters(mp); 1523 if (error) 1524 goto out_destroy_workqueues; 1525 1526 /* Allocate stats memory before we do operations that might use it */ 1527 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats); 1528 if (!mp->m_stats.xs_stats) { 1529 error = -ENOMEM; 1530 goto out_destroy_counters; 1531 } 1532 1533 error = xfs_readsb(mp, flags); 1534 if (error) 1535 goto out_free_stats; 1536 1537 error = xfs_finish_flags(mp); 1538 if (error) 1539 goto out_free_sb; 1540 1541 error = xfs_setup_devices(mp); 1542 if (error) 1543 goto out_free_sb; 1544 1545 error = xfs_filestream_mount(mp); 1546 if (error) 1547 goto out_free_sb; 1548 1549 /* 1550 * we must configure the block size in the superblock before we run the 1551 * full mount process as the mount process can lookup and cache inodes. 1552 */ 1553 sb->s_magic = XFS_SB_MAGIC; 1554 sb->s_blocksize = mp->m_sb.sb_blocksize; 1555 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1556 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1557 sb->s_max_links = XFS_MAXLINK; 1558 sb->s_time_gran = 1; 1559 set_posix_acl_flag(sb); 1560 1561 /* version 5 superblocks support inode version counters. */ 1562 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5) 1563 sb->s_flags |= MS_I_VERSION; 1564 1565 if (mp->m_flags & XFS_MOUNT_DAX) { 1566 xfs_warn(mp, 1567 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 1568 1569 error = bdev_dax_supported(sb, sb->s_blocksize); 1570 if (error) { 1571 xfs_alert(mp, 1572 "DAX unsupported by block device. Turning off DAX."); 1573 mp->m_flags &= ~XFS_MOUNT_DAX; 1574 } 1575 } 1576 1577 if (xfs_sb_version_hasrmapbt(&mp->m_sb)) 1578 xfs_alert(mp, 1579 "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!"); 1580 1581 error = xfs_mountfs(mp); 1582 if (error) 1583 goto out_filestream_unmount; 1584 1585 root = igrab(VFS_I(mp->m_rootip)); 1586 if (!root) { 1587 error = -ENOENT; 1588 goto out_unmount; 1589 } 1590 sb->s_root = d_make_root(root); 1591 if (!sb->s_root) { 1592 error = -ENOMEM; 1593 goto out_unmount; 1594 } 1595 1596 return 0; 1597 1598 out_filestream_unmount: 1599 xfs_filestream_unmount(mp); 1600 out_free_sb: 1601 xfs_freesb(mp); 1602 out_free_stats: 1603 free_percpu(mp->m_stats.xs_stats); 1604 out_destroy_counters: 1605 xfs_destroy_percpu_counters(mp); 1606 out_destroy_workqueues: 1607 xfs_destroy_mount_workqueues(mp); 1608 out_close_devices: 1609 xfs_close_devices(mp); 1610 out_free_fsname: 1611 xfs_free_fsname(mp); 1612 kfree(mp); 1613 out: 1614 return error; 1615 1616 out_unmount: 1617 xfs_filestream_unmount(mp); 1618 xfs_unmountfs(mp); 1619 goto out_free_sb; 1620 } 1621 1622 STATIC void 1623 xfs_fs_put_super( 1624 struct super_block *sb) 1625 { 1626 struct xfs_mount *mp = XFS_M(sb); 1627 1628 xfs_notice(mp, "Unmounting Filesystem"); 1629 xfs_filestream_unmount(mp); 1630 xfs_unmountfs(mp); 1631 1632 xfs_freesb(mp); 1633 free_percpu(mp->m_stats.xs_stats); 1634 xfs_destroy_percpu_counters(mp); 1635 xfs_destroy_mount_workqueues(mp); 1636 xfs_close_devices(mp); 1637 xfs_free_fsname(mp); 1638 kfree(mp); 1639 } 1640 1641 STATIC struct dentry * 1642 xfs_fs_mount( 1643 struct file_system_type *fs_type, 1644 int flags, 1645 const char *dev_name, 1646 void *data) 1647 { 1648 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1649 } 1650 1651 static long 1652 xfs_fs_nr_cached_objects( 1653 struct super_block *sb, 1654 struct shrink_control *sc) 1655 { 1656 return xfs_reclaim_inodes_count(XFS_M(sb)); 1657 } 1658 1659 static long 1660 xfs_fs_free_cached_objects( 1661 struct super_block *sb, 1662 struct shrink_control *sc) 1663 { 1664 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); 1665 } 1666 1667 static const struct super_operations xfs_super_operations = { 1668 .alloc_inode = xfs_fs_alloc_inode, 1669 .destroy_inode = xfs_fs_destroy_inode, 1670 .drop_inode = xfs_fs_drop_inode, 1671 .put_super = xfs_fs_put_super, 1672 .sync_fs = xfs_fs_sync_fs, 1673 .freeze_fs = xfs_fs_freeze, 1674 .unfreeze_fs = xfs_fs_unfreeze, 1675 .statfs = xfs_fs_statfs, 1676 .remount_fs = xfs_fs_remount, 1677 .show_options = xfs_fs_show_options, 1678 .nr_cached_objects = xfs_fs_nr_cached_objects, 1679 .free_cached_objects = xfs_fs_free_cached_objects, 1680 }; 1681 1682 static struct file_system_type xfs_fs_type = { 1683 .owner = THIS_MODULE, 1684 .name = "xfs", 1685 .mount = xfs_fs_mount, 1686 .kill_sb = kill_block_super, 1687 .fs_flags = FS_REQUIRES_DEV, 1688 }; 1689 MODULE_ALIAS_FS("xfs"); 1690 1691 STATIC int __init 1692 xfs_init_zones(void) 1693 { 1694 xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE, 1695 offsetof(struct xfs_ioend, io_inline_bio)); 1696 if (!xfs_ioend_bioset) 1697 goto out; 1698 1699 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1700 "xfs_log_ticket"); 1701 if (!xfs_log_ticket_zone) 1702 goto out_free_ioend_bioset; 1703 1704 xfs_bmap_free_item_zone = kmem_zone_init( 1705 sizeof(struct xfs_extent_free_item), 1706 "xfs_bmap_free_item"); 1707 if (!xfs_bmap_free_item_zone) 1708 goto out_destroy_log_ticket_zone; 1709 1710 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1711 "xfs_btree_cur"); 1712 if (!xfs_btree_cur_zone) 1713 goto out_destroy_bmap_free_item_zone; 1714 1715 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1716 "xfs_da_state"); 1717 if (!xfs_da_state_zone) 1718 goto out_destroy_btree_cur_zone; 1719 1720 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1721 if (!xfs_ifork_zone) 1722 goto out_destroy_da_state_zone; 1723 1724 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1725 if (!xfs_trans_zone) 1726 goto out_destroy_ifork_zone; 1727 1728 xfs_log_item_desc_zone = 1729 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1730 "xfs_log_item_desc"); 1731 if (!xfs_log_item_desc_zone) 1732 goto out_destroy_trans_zone; 1733 1734 /* 1735 * The size of the zone allocated buf log item is the maximum 1736 * size possible under XFS. This wastes a little bit of memory, 1737 * but it is much faster. 1738 */ 1739 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item), 1740 "xfs_buf_item"); 1741 if (!xfs_buf_item_zone) 1742 goto out_destroy_log_item_desc_zone; 1743 1744 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1745 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1746 sizeof(xfs_extent_t))), "xfs_efd_item"); 1747 if (!xfs_efd_zone) 1748 goto out_destroy_buf_item_zone; 1749 1750 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1751 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1752 sizeof(xfs_extent_t))), "xfs_efi_item"); 1753 if (!xfs_efi_zone) 1754 goto out_destroy_efd_zone; 1755 1756 xfs_inode_zone = 1757 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1758 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD | 1759 KM_ZONE_ACCOUNT, xfs_fs_inode_init_once); 1760 if (!xfs_inode_zone) 1761 goto out_destroy_efi_zone; 1762 1763 xfs_ili_zone = 1764 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1765 KM_ZONE_SPREAD, NULL); 1766 if (!xfs_ili_zone) 1767 goto out_destroy_inode_zone; 1768 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item), 1769 "xfs_icr"); 1770 if (!xfs_icreate_zone) 1771 goto out_destroy_ili_zone; 1772 1773 xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item), 1774 "xfs_rud_item"); 1775 if (!xfs_rud_zone) 1776 goto out_destroy_icreate_zone; 1777 1778 xfs_rui_zone = kmem_zone_init((sizeof(struct xfs_rui_log_item) + 1779 ((XFS_RUI_MAX_FAST_EXTENTS - 1) * 1780 sizeof(struct xfs_map_extent))), 1781 "xfs_rui_item"); 1782 if (!xfs_rui_zone) 1783 goto out_destroy_rud_zone; 1784 1785 return 0; 1786 1787 out_destroy_rud_zone: 1788 kmem_zone_destroy(xfs_rud_zone); 1789 out_destroy_icreate_zone: 1790 kmem_zone_destroy(xfs_icreate_zone); 1791 out_destroy_ili_zone: 1792 kmem_zone_destroy(xfs_ili_zone); 1793 out_destroy_inode_zone: 1794 kmem_zone_destroy(xfs_inode_zone); 1795 out_destroy_efi_zone: 1796 kmem_zone_destroy(xfs_efi_zone); 1797 out_destroy_efd_zone: 1798 kmem_zone_destroy(xfs_efd_zone); 1799 out_destroy_buf_item_zone: 1800 kmem_zone_destroy(xfs_buf_item_zone); 1801 out_destroy_log_item_desc_zone: 1802 kmem_zone_destroy(xfs_log_item_desc_zone); 1803 out_destroy_trans_zone: 1804 kmem_zone_destroy(xfs_trans_zone); 1805 out_destroy_ifork_zone: 1806 kmem_zone_destroy(xfs_ifork_zone); 1807 out_destroy_da_state_zone: 1808 kmem_zone_destroy(xfs_da_state_zone); 1809 out_destroy_btree_cur_zone: 1810 kmem_zone_destroy(xfs_btree_cur_zone); 1811 out_destroy_bmap_free_item_zone: 1812 kmem_zone_destroy(xfs_bmap_free_item_zone); 1813 out_destroy_log_ticket_zone: 1814 kmem_zone_destroy(xfs_log_ticket_zone); 1815 out_free_ioend_bioset: 1816 bioset_free(xfs_ioend_bioset); 1817 out: 1818 return -ENOMEM; 1819 } 1820 1821 STATIC void 1822 xfs_destroy_zones(void) 1823 { 1824 /* 1825 * Make sure all delayed rcu free are flushed before we 1826 * destroy caches. 1827 */ 1828 rcu_barrier(); 1829 kmem_zone_destroy(xfs_rui_zone); 1830 kmem_zone_destroy(xfs_rud_zone); 1831 kmem_zone_destroy(xfs_icreate_zone); 1832 kmem_zone_destroy(xfs_ili_zone); 1833 kmem_zone_destroy(xfs_inode_zone); 1834 kmem_zone_destroy(xfs_efi_zone); 1835 kmem_zone_destroy(xfs_efd_zone); 1836 kmem_zone_destroy(xfs_buf_item_zone); 1837 kmem_zone_destroy(xfs_log_item_desc_zone); 1838 kmem_zone_destroy(xfs_trans_zone); 1839 kmem_zone_destroy(xfs_ifork_zone); 1840 kmem_zone_destroy(xfs_da_state_zone); 1841 kmem_zone_destroy(xfs_btree_cur_zone); 1842 kmem_zone_destroy(xfs_bmap_free_item_zone); 1843 kmem_zone_destroy(xfs_log_ticket_zone); 1844 bioset_free(xfs_ioend_bioset); 1845 } 1846 1847 STATIC int __init 1848 xfs_init_workqueues(void) 1849 { 1850 /* 1851 * The allocation workqueue can be used in memory reclaim situations 1852 * (writepage path), and parallelism is only limited by the number of 1853 * AGs in all the filesystems mounted. Hence use the default large 1854 * max_active value for this workqueue. 1855 */ 1856 xfs_alloc_wq = alloc_workqueue("xfsalloc", 1857 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0); 1858 if (!xfs_alloc_wq) 1859 return -ENOMEM; 1860 1861 return 0; 1862 } 1863 1864 STATIC void 1865 xfs_destroy_workqueues(void) 1866 { 1867 destroy_workqueue(xfs_alloc_wq); 1868 } 1869 1870 STATIC int __init 1871 init_xfs_fs(void) 1872 { 1873 int error; 1874 1875 xfs_check_ondisk_structs(); 1876 1877 printk(KERN_INFO XFS_VERSION_STRING " with " 1878 XFS_BUILD_OPTIONS " enabled\n"); 1879 1880 xfs_extent_free_init_defer_op(); 1881 xfs_rmap_update_init_defer_op(); 1882 1883 xfs_dir_startup(); 1884 1885 error = xfs_init_zones(); 1886 if (error) 1887 goto out; 1888 1889 error = xfs_init_workqueues(); 1890 if (error) 1891 goto out_destroy_zones; 1892 1893 error = xfs_mru_cache_init(); 1894 if (error) 1895 goto out_destroy_wq; 1896 1897 error = xfs_buf_init(); 1898 if (error) 1899 goto out_mru_cache_uninit; 1900 1901 error = xfs_init_procfs(); 1902 if (error) 1903 goto out_buf_terminate; 1904 1905 error = xfs_sysctl_register(); 1906 if (error) 1907 goto out_cleanup_procfs; 1908 1909 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj); 1910 if (!xfs_kset) { 1911 error = -ENOMEM; 1912 goto out_sysctl_unregister; 1913 } 1914 1915 xfsstats.xs_kobj.kobject.kset = xfs_kset; 1916 1917 xfsstats.xs_stats = alloc_percpu(struct xfsstats); 1918 if (!xfsstats.xs_stats) { 1919 error = -ENOMEM; 1920 goto out_kset_unregister; 1921 } 1922 1923 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL, 1924 "stats"); 1925 if (error) 1926 goto out_free_stats; 1927 1928 #ifdef DEBUG 1929 xfs_dbg_kobj.kobject.kset = xfs_kset; 1930 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug"); 1931 if (error) 1932 goto out_remove_stats_kobj; 1933 #endif 1934 1935 error = xfs_qm_init(); 1936 if (error) 1937 goto out_remove_dbg_kobj; 1938 1939 error = register_filesystem(&xfs_fs_type); 1940 if (error) 1941 goto out_qm_exit; 1942 return 0; 1943 1944 out_qm_exit: 1945 xfs_qm_exit(); 1946 out_remove_dbg_kobj: 1947 #ifdef DEBUG 1948 xfs_sysfs_del(&xfs_dbg_kobj); 1949 out_remove_stats_kobj: 1950 #endif 1951 xfs_sysfs_del(&xfsstats.xs_kobj); 1952 out_free_stats: 1953 free_percpu(xfsstats.xs_stats); 1954 out_kset_unregister: 1955 kset_unregister(xfs_kset); 1956 out_sysctl_unregister: 1957 xfs_sysctl_unregister(); 1958 out_cleanup_procfs: 1959 xfs_cleanup_procfs(); 1960 out_buf_terminate: 1961 xfs_buf_terminate(); 1962 out_mru_cache_uninit: 1963 xfs_mru_cache_uninit(); 1964 out_destroy_wq: 1965 xfs_destroy_workqueues(); 1966 out_destroy_zones: 1967 xfs_destroy_zones(); 1968 out: 1969 return error; 1970 } 1971 1972 STATIC void __exit 1973 exit_xfs_fs(void) 1974 { 1975 xfs_qm_exit(); 1976 unregister_filesystem(&xfs_fs_type); 1977 #ifdef DEBUG 1978 xfs_sysfs_del(&xfs_dbg_kobj); 1979 #endif 1980 xfs_sysfs_del(&xfsstats.xs_kobj); 1981 free_percpu(xfsstats.xs_stats); 1982 kset_unregister(xfs_kset); 1983 xfs_sysctl_unregister(); 1984 xfs_cleanup_procfs(); 1985 xfs_buf_terminate(); 1986 xfs_mru_cache_uninit(); 1987 xfs_destroy_workqueues(); 1988 xfs_destroy_zones(); 1989 xfs_uuid_table_free(); 1990 } 1991 1992 module_init(init_xfs_fs); 1993 module_exit(exit_xfs_fs); 1994 1995 MODULE_AUTHOR("Silicon Graphics, Inc."); 1996 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1997 MODULE_LICENSE("GPL"); 1998