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_log.h" 21 #include "xfs_inum.h" 22 #include "xfs_trans.h" 23 #include "xfs_sb.h" 24 #include "xfs_ag.h" 25 #include "xfs_dir2.h" 26 #include "xfs_alloc.h" 27 #include "xfs_quota.h" 28 #include "xfs_mount.h" 29 #include "xfs_bmap_btree.h" 30 #include "xfs_alloc_btree.h" 31 #include "xfs_ialloc_btree.h" 32 #include "xfs_dinode.h" 33 #include "xfs_inode.h" 34 #include "xfs_btree.h" 35 #include "xfs_ialloc.h" 36 #include "xfs_bmap.h" 37 #include "xfs_rtalloc.h" 38 #include "xfs_error.h" 39 #include "xfs_itable.h" 40 #include "xfs_fsops.h" 41 #include "xfs_attr.h" 42 #include "xfs_buf_item.h" 43 #include "xfs_utils.h" 44 #include "xfs_vnodeops.h" 45 #include "xfs_log_priv.h" 46 #include "xfs_trans_priv.h" 47 #include "xfs_filestream.h" 48 #include "xfs_da_btree.h" 49 #include "xfs_extfree_item.h" 50 #include "xfs_mru_cache.h" 51 #include "xfs_inode_item.h" 52 #include "xfs_icache.h" 53 #include "xfs_trace.h" 54 55 #include <linux/namei.h> 56 #include <linux/init.h> 57 #include <linux/slab.h> 58 #include <linux/mount.h> 59 #include <linux/mempool.h> 60 #include <linux/writeback.h> 61 #include <linux/kthread.h> 62 #include <linux/freezer.h> 63 #include <linux/parser.h> 64 65 static const struct super_operations xfs_super_operations; 66 static kmem_zone_t *xfs_ioend_zone; 67 mempool_t *xfs_ioend_pool; 68 69 #define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */ 70 #define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */ 71 #define MNTOPT_LOGDEV "logdev" /* log device */ 72 #define MNTOPT_RTDEV "rtdev" /* realtime I/O device */ 73 #define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */ 74 #define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */ 75 #define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */ 76 #define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */ 77 #define MNTOPT_SUNIT "sunit" /* data volume stripe unit */ 78 #define MNTOPT_SWIDTH "swidth" /* data volume stripe width */ 79 #define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */ 80 #define MNTOPT_MTPT "mtpt" /* filesystem mount point */ 81 #define MNTOPT_GRPID "grpid" /* group-ID from parent directory */ 82 #define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */ 83 #define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */ 84 #define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */ 85 #define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */ 86 #define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */ 87 #define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and 88 * unwritten extent conversion */ 89 #define MNTOPT_NOBARRIER "nobarrier" /* .. disable */ 90 #define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */ 91 #define MNTOPT_32BITINODE "inode32" /* inode allocation limited to 92 * XFS_MAXINUMBER_32 */ 93 #define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */ 94 #define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ 95 #define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */ 96 #define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes 97 * in stat(). */ 98 #define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */ 99 #define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */ 100 #define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */ 101 #define MNTOPT_QUOTA "quota" /* disk quotas (user) */ 102 #define MNTOPT_NOQUOTA "noquota" /* no quotas */ 103 #define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */ 104 #define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */ 105 #define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */ 106 #define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */ 107 #define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */ 108 #define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */ 109 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */ 110 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */ 111 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */ 112 #define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */ 113 #define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */ 114 #define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */ 115 #define MNTOPT_DISCARD "discard" /* Discard unused blocks */ 116 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */ 117 118 /* 119 * Table driven mount option parser. 120 * 121 * Currently only used for remount, but it will be used for mount 122 * in the future, too. 123 */ 124 enum { 125 Opt_barrier, 126 Opt_nobarrier, 127 Opt_inode64, 128 Opt_inode32, 129 Opt_err 130 }; 131 132 static const match_table_t tokens = { 133 {Opt_barrier, "barrier"}, 134 {Opt_nobarrier, "nobarrier"}, 135 {Opt_inode64, "inode64"}, 136 {Opt_inode32, "inode32"}, 137 {Opt_err, NULL} 138 }; 139 140 141 STATIC unsigned long 142 suffix_kstrtoint(char *s, unsigned int base, int *res) 143 { 144 int last, shift_left_factor = 0, _res; 145 char *value = s; 146 147 last = strlen(value) - 1; 148 if (value[last] == 'K' || value[last] == 'k') { 149 shift_left_factor = 10; 150 value[last] = '\0'; 151 } 152 if (value[last] == 'M' || value[last] == 'm') { 153 shift_left_factor = 20; 154 value[last] = '\0'; 155 } 156 if (value[last] == 'G' || value[last] == 'g') { 157 shift_left_factor = 30; 158 value[last] = '\0'; 159 } 160 161 if (kstrtoint(s, base, &_res)) 162 return -EINVAL; 163 *res = _res << shift_left_factor; 164 return 0; 165 } 166 167 /* 168 * This function fills in xfs_mount_t fields based on mount args. 169 * Note: the superblock has _not_ yet been read in. 170 * 171 * Note that this function leaks the various device name allocations on 172 * failure. The caller takes care of them. 173 */ 174 STATIC int 175 xfs_parseargs( 176 struct xfs_mount *mp, 177 char *options) 178 { 179 struct super_block *sb = mp->m_super; 180 char *this_char, *value; 181 int dsunit = 0; 182 int dswidth = 0; 183 int iosize = 0; 184 __uint8_t iosizelog = 0; 185 186 /* 187 * set up the mount name first so all the errors will refer to the 188 * correct device. 189 */ 190 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL); 191 if (!mp->m_fsname) 192 return ENOMEM; 193 mp->m_fsname_len = strlen(mp->m_fsname) + 1; 194 195 /* 196 * Copy binary VFS mount flags we are interested in. 197 */ 198 if (sb->s_flags & MS_RDONLY) 199 mp->m_flags |= XFS_MOUNT_RDONLY; 200 if (sb->s_flags & MS_DIRSYNC) 201 mp->m_flags |= XFS_MOUNT_DIRSYNC; 202 if (sb->s_flags & MS_SYNCHRONOUS) 203 mp->m_flags |= XFS_MOUNT_WSYNC; 204 205 /* 206 * Set some default flags that could be cleared by the mount option 207 * parsing. 208 */ 209 mp->m_flags |= XFS_MOUNT_BARRIER; 210 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 211 #if !XFS_BIG_INUMS 212 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 213 #endif 214 215 /* 216 * These can be overridden by the mount option parsing. 217 */ 218 mp->m_logbufs = -1; 219 mp->m_logbsize = -1; 220 221 if (!options) 222 goto done; 223 224 while ((this_char = strsep(&options, ",")) != NULL) { 225 if (!*this_char) 226 continue; 227 if ((value = strchr(this_char, '=')) != NULL) 228 *value++ = 0; 229 230 if (!strcmp(this_char, MNTOPT_LOGBUFS)) { 231 if (!value || !*value) { 232 xfs_warn(mp, "%s option requires an argument", 233 this_char); 234 return EINVAL; 235 } 236 if (kstrtoint(value, 10, &mp->m_logbufs)) 237 return EINVAL; 238 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) { 239 if (!value || !*value) { 240 xfs_warn(mp, "%s option requires an argument", 241 this_char); 242 return EINVAL; 243 } 244 if (suffix_kstrtoint(value, 10, &mp->m_logbsize)) 245 return EINVAL; 246 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { 247 if (!value || !*value) { 248 xfs_warn(mp, "%s option requires an argument", 249 this_char); 250 return EINVAL; 251 } 252 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 253 if (!mp->m_logname) 254 return ENOMEM; 255 } else if (!strcmp(this_char, MNTOPT_MTPT)) { 256 xfs_warn(mp, "%s option not allowed on this system", 257 this_char); 258 return EINVAL; 259 } else if (!strcmp(this_char, MNTOPT_RTDEV)) { 260 if (!value || !*value) { 261 xfs_warn(mp, "%s option requires an argument", 262 this_char); 263 return EINVAL; 264 } 265 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 266 if (!mp->m_rtname) 267 return ENOMEM; 268 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) { 269 if (!value || !*value) { 270 xfs_warn(mp, "%s option requires an argument", 271 this_char); 272 return EINVAL; 273 } 274 if (kstrtoint(value, 10, &iosize)) 275 return EINVAL; 276 iosizelog = ffs(iosize) - 1; 277 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) { 278 if (!value || !*value) { 279 xfs_warn(mp, "%s option requires an argument", 280 this_char); 281 return EINVAL; 282 } 283 if (suffix_kstrtoint(value, 10, &iosize)) 284 return EINVAL; 285 iosizelog = ffs(iosize) - 1; 286 } else if (!strcmp(this_char, MNTOPT_GRPID) || 287 !strcmp(this_char, MNTOPT_BSDGROUPS)) { 288 mp->m_flags |= XFS_MOUNT_GRPID; 289 } else if (!strcmp(this_char, MNTOPT_NOGRPID) || 290 !strcmp(this_char, MNTOPT_SYSVGROUPS)) { 291 mp->m_flags &= ~XFS_MOUNT_GRPID; 292 } else if (!strcmp(this_char, MNTOPT_WSYNC)) { 293 mp->m_flags |= XFS_MOUNT_WSYNC; 294 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { 295 mp->m_flags |= XFS_MOUNT_NORECOVERY; 296 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { 297 mp->m_flags |= XFS_MOUNT_NOALIGN; 298 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { 299 mp->m_flags |= XFS_MOUNT_SWALLOC; 300 } else if (!strcmp(this_char, MNTOPT_SUNIT)) { 301 if (!value || !*value) { 302 xfs_warn(mp, "%s option requires an argument", 303 this_char); 304 return EINVAL; 305 } 306 if (kstrtoint(value, 10, &dsunit)) 307 return EINVAL; 308 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { 309 if (!value || !*value) { 310 xfs_warn(mp, "%s option requires an argument", 311 this_char); 312 return EINVAL; 313 } 314 if (kstrtoint(value, 10, &dswidth)) 315 return EINVAL; 316 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) { 317 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 318 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { 319 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 320 #if !XFS_BIG_INUMS 321 xfs_warn(mp, "%s option not allowed on this system", 322 this_char); 323 return EINVAL; 324 #endif 325 } else if (!strcmp(this_char, MNTOPT_NOUUID)) { 326 mp->m_flags |= XFS_MOUNT_NOUUID; 327 } else if (!strcmp(this_char, MNTOPT_BARRIER)) { 328 mp->m_flags |= XFS_MOUNT_BARRIER; 329 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) { 330 mp->m_flags &= ~XFS_MOUNT_BARRIER; 331 } else if (!strcmp(this_char, MNTOPT_IKEEP)) { 332 mp->m_flags |= XFS_MOUNT_IKEEP; 333 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { 334 mp->m_flags &= ~XFS_MOUNT_IKEEP; 335 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) { 336 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 337 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) { 338 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 339 } else if (!strcmp(this_char, MNTOPT_ATTR2)) { 340 mp->m_flags |= XFS_MOUNT_ATTR2; 341 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) { 342 mp->m_flags &= ~XFS_MOUNT_ATTR2; 343 mp->m_flags |= XFS_MOUNT_NOATTR2; 344 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) { 345 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 346 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) { 347 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 348 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 349 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 350 } else if (!strcmp(this_char, MNTOPT_QUOTA) || 351 !strcmp(this_char, MNTOPT_UQUOTA) || 352 !strcmp(this_char, MNTOPT_USRQUOTA)) { 353 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 354 XFS_UQUOTA_ENFD); 355 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) || 356 !strcmp(this_char, MNTOPT_UQUOTANOENF)) { 357 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 358 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 359 } else if (!strcmp(this_char, MNTOPT_PQUOTA) || 360 !strcmp(this_char, MNTOPT_PRJQUOTA)) { 361 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 362 XFS_OQUOTA_ENFD); 363 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) { 364 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 365 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 366 } else if (!strcmp(this_char, MNTOPT_GQUOTA) || 367 !strcmp(this_char, MNTOPT_GRPQUOTA)) { 368 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 369 XFS_OQUOTA_ENFD); 370 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) { 371 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 372 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 373 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) { 374 xfs_warn(mp, 375 "delaylog is the default now, option is deprecated."); 376 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) { 377 xfs_warn(mp, 378 "nodelaylog support has been removed, option is deprecated."); 379 } else if (!strcmp(this_char, MNTOPT_DISCARD)) { 380 mp->m_flags |= XFS_MOUNT_DISCARD; 381 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) { 382 mp->m_flags &= ~XFS_MOUNT_DISCARD; 383 } else if (!strcmp(this_char, "ihashsize")) { 384 xfs_warn(mp, 385 "ihashsize no longer used, option is deprecated."); 386 } else if (!strcmp(this_char, "osyncisdsync")) { 387 xfs_warn(mp, 388 "osyncisdsync has no effect, option is deprecated."); 389 } else if (!strcmp(this_char, "osyncisosync")) { 390 xfs_warn(mp, 391 "osyncisosync has no effect, option is deprecated."); 392 } else if (!strcmp(this_char, "irixsgid")) { 393 xfs_warn(mp, 394 "irixsgid is now a sysctl(2) variable, option is deprecated."); 395 } else { 396 xfs_warn(mp, "unknown mount option [%s].", this_char); 397 return EINVAL; 398 } 399 } 400 401 /* 402 * no recovery flag requires a read-only mount 403 */ 404 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 405 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 406 xfs_warn(mp, "no-recovery mounts must be read-only."); 407 return EINVAL; 408 } 409 410 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 411 xfs_warn(mp, 412 "sunit and swidth options incompatible with the noalign option"); 413 return EINVAL; 414 } 415 416 #ifndef CONFIG_XFS_QUOTA 417 if (XFS_IS_QUOTA_RUNNING(mp)) { 418 xfs_warn(mp, "quota support not available in this kernel."); 419 return EINVAL; 420 } 421 #endif 422 423 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 424 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) { 425 xfs_warn(mp, "cannot mount with both project and group quota"); 426 return EINVAL; 427 } 428 429 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 430 xfs_warn(mp, "sunit and swidth must be specified together"); 431 return EINVAL; 432 } 433 434 if (dsunit && (dswidth % dsunit != 0)) { 435 xfs_warn(mp, 436 "stripe width (%d) must be a multiple of the stripe unit (%d)", 437 dswidth, dsunit); 438 return EINVAL; 439 } 440 441 done: 442 if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) { 443 /* 444 * At this point the superblock has not been read 445 * in, therefore we do not know the block size. 446 * Before the mount call ends we will convert 447 * these to FSBs. 448 */ 449 if (dsunit) { 450 mp->m_dalign = dsunit; 451 mp->m_flags |= XFS_MOUNT_RETERR; 452 } 453 454 if (dswidth) 455 mp->m_swidth = dswidth; 456 } 457 458 if (mp->m_logbufs != -1 && 459 mp->m_logbufs != 0 && 460 (mp->m_logbufs < XLOG_MIN_ICLOGS || 461 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 462 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 463 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 464 return XFS_ERROR(EINVAL); 465 } 466 if (mp->m_logbsize != -1 && 467 mp->m_logbsize != 0 && 468 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 469 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 470 !is_power_of_2(mp->m_logbsize))) { 471 xfs_warn(mp, 472 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 473 mp->m_logbsize); 474 return XFS_ERROR(EINVAL); 475 } 476 477 if (iosizelog) { 478 if (iosizelog > XFS_MAX_IO_LOG || 479 iosizelog < XFS_MIN_IO_LOG) { 480 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 481 iosizelog, XFS_MIN_IO_LOG, 482 XFS_MAX_IO_LOG); 483 return XFS_ERROR(EINVAL); 484 } 485 486 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 487 mp->m_readio_log = iosizelog; 488 mp->m_writeio_log = iosizelog; 489 } 490 491 return 0; 492 } 493 494 struct proc_xfs_info { 495 int flag; 496 char *str; 497 }; 498 499 STATIC int 500 xfs_showargs( 501 struct xfs_mount *mp, 502 struct seq_file *m) 503 { 504 static struct proc_xfs_info xfs_info_set[] = { 505 /* the few simple ones we can get from the mount struct */ 506 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP }, 507 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, 508 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, 509 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, 510 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, 511 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, 512 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 }, 513 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM }, 514 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID }, 515 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD }, 516 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE }, 517 { 0, NULL } 518 }; 519 static struct proc_xfs_info xfs_info_unset[] = { 520 /* the few simple ones we can get from the mount struct */ 521 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO }, 522 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER }, 523 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE }, 524 { 0, NULL } 525 }; 526 struct proc_xfs_info *xfs_infop; 527 528 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { 529 if (mp->m_flags & xfs_infop->flag) 530 seq_puts(m, xfs_infop->str); 531 } 532 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) { 533 if (!(mp->m_flags & xfs_infop->flag)) 534 seq_puts(m, xfs_infop->str); 535 } 536 537 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) 538 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk", 539 (int)(1 << mp->m_writeio_log) >> 10); 540 541 if (mp->m_logbufs > 0) 542 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs); 543 if (mp->m_logbsize > 0) 544 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10); 545 546 if (mp->m_logname) 547 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname); 548 if (mp->m_rtname) 549 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname); 550 551 if (mp->m_dalign > 0) 552 seq_printf(m, "," MNTOPT_SUNIT "=%d", 553 (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); 554 if (mp->m_swidth > 0) 555 seq_printf(m, "," MNTOPT_SWIDTH "=%d", 556 (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); 557 558 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD)) 559 seq_puts(m, "," MNTOPT_USRQUOTA); 560 else if (mp->m_qflags & XFS_UQUOTA_ACCT) 561 seq_puts(m, "," MNTOPT_UQUOTANOENF); 562 563 /* Either project or group quotas can be active, not both */ 564 565 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 566 if (mp->m_qflags & XFS_OQUOTA_ENFD) 567 seq_puts(m, "," MNTOPT_PRJQUOTA); 568 else 569 seq_puts(m, "," MNTOPT_PQUOTANOENF); 570 } else if (mp->m_qflags & XFS_GQUOTA_ACCT) { 571 if (mp->m_qflags & XFS_OQUOTA_ENFD) 572 seq_puts(m, "," MNTOPT_GRPQUOTA); 573 else 574 seq_puts(m, "," MNTOPT_GQUOTANOENF); 575 } 576 577 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 578 seq_puts(m, "," MNTOPT_NOQUOTA); 579 580 return 0; 581 } 582 __uint64_t 583 xfs_max_file_offset( 584 unsigned int blockshift) 585 { 586 unsigned int pagefactor = 1; 587 unsigned int bitshift = BITS_PER_LONG - 1; 588 589 /* Figure out maximum filesize, on Linux this can depend on 590 * the filesystem blocksize (on 32 bit platforms). 591 * __block_write_begin does this in an [unsigned] long... 592 * page->index << (PAGE_CACHE_SHIFT - bbits) 593 * So, for page sized blocks (4K on 32 bit platforms), 594 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 595 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 596 * but for smaller blocksizes it is less (bbits = log2 bsize). 597 * Note1: get_block_t takes a long (implicit cast from above) 598 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 599 * can optionally convert the [unsigned] long from above into 600 * an [unsigned] long long. 601 */ 602 603 #if BITS_PER_LONG == 32 604 # if defined(CONFIG_LBDAF) 605 ASSERT(sizeof(sector_t) == 8); 606 pagefactor = PAGE_CACHE_SIZE; 607 bitshift = BITS_PER_LONG; 608 # else 609 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); 610 # endif 611 #endif 612 613 return (((__uint64_t)pagefactor) << bitshift) - 1; 614 } 615 616 xfs_agnumber_t 617 xfs_set_inode32(struct xfs_mount *mp) 618 { 619 xfs_agnumber_t index = 0; 620 xfs_agnumber_t maxagi = 0; 621 xfs_sb_t *sbp = &mp->m_sb; 622 xfs_agnumber_t max_metadata; 623 xfs_agino_t agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0); 624 xfs_ino_t ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino); 625 xfs_perag_t *pag; 626 627 /* Calculate how much should be reserved for inodes to meet 628 * the max inode percentage. 629 */ 630 if (mp->m_maxicount) { 631 __uint64_t icount; 632 633 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 634 do_div(icount, 100); 635 icount += sbp->sb_agblocks - 1; 636 do_div(icount, sbp->sb_agblocks); 637 max_metadata = icount; 638 } else { 639 max_metadata = sbp->sb_agcount; 640 } 641 642 for (index = 0; index < sbp->sb_agcount; index++) { 643 ino = XFS_AGINO_TO_INO(mp, index, agino); 644 645 if (ino > XFS_MAXINUMBER_32) { 646 pag = xfs_perag_get(mp, index); 647 pag->pagi_inodeok = 0; 648 pag->pagf_metadata = 0; 649 xfs_perag_put(pag); 650 continue; 651 } 652 653 pag = xfs_perag_get(mp, index); 654 pag->pagi_inodeok = 1; 655 maxagi++; 656 if (index < max_metadata) 657 pag->pagf_metadata = 1; 658 xfs_perag_put(pag); 659 } 660 mp->m_flags |= (XFS_MOUNT_32BITINODES | 661 XFS_MOUNT_SMALL_INUMS); 662 663 return maxagi; 664 } 665 666 xfs_agnumber_t 667 xfs_set_inode64(struct xfs_mount *mp) 668 { 669 xfs_agnumber_t index = 0; 670 671 for (index = 0; index < mp->m_sb.sb_agcount; index++) { 672 struct xfs_perag *pag; 673 674 pag = xfs_perag_get(mp, index); 675 pag->pagi_inodeok = 1; 676 pag->pagf_metadata = 0; 677 xfs_perag_put(pag); 678 } 679 680 /* There is no need for lock protection on m_flags, 681 * the rw_semaphore of the VFS superblock is locked 682 * during mount/umount/remount operations, so this is 683 * enough to avoid concurency on the m_flags field 684 */ 685 mp->m_flags &= ~(XFS_MOUNT_32BITINODES | 686 XFS_MOUNT_SMALL_INUMS); 687 return index; 688 } 689 690 STATIC int 691 xfs_blkdev_get( 692 xfs_mount_t *mp, 693 const char *name, 694 struct block_device **bdevp) 695 { 696 int error = 0; 697 698 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 699 mp); 700 if (IS_ERR(*bdevp)) { 701 error = PTR_ERR(*bdevp); 702 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error); 703 } 704 705 return -error; 706 } 707 708 STATIC void 709 xfs_blkdev_put( 710 struct block_device *bdev) 711 { 712 if (bdev) 713 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 714 } 715 716 void 717 xfs_blkdev_issue_flush( 718 xfs_buftarg_t *buftarg) 719 { 720 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 721 } 722 723 STATIC void 724 xfs_close_devices( 725 struct xfs_mount *mp) 726 { 727 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 728 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 729 xfs_free_buftarg(mp, mp->m_logdev_targp); 730 xfs_blkdev_put(logdev); 731 } 732 if (mp->m_rtdev_targp) { 733 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 734 xfs_free_buftarg(mp, mp->m_rtdev_targp); 735 xfs_blkdev_put(rtdev); 736 } 737 xfs_free_buftarg(mp, mp->m_ddev_targp); 738 } 739 740 /* 741 * The file system configurations are: 742 * (1) device (partition) with data and internal log 743 * (2) logical volume with data and log subvolumes. 744 * (3) logical volume with data, log, and realtime subvolumes. 745 * 746 * We only have to handle opening the log and realtime volumes here if 747 * they are present. The data subvolume has already been opened by 748 * get_sb_bdev() and is stored in sb->s_bdev. 749 */ 750 STATIC int 751 xfs_open_devices( 752 struct xfs_mount *mp) 753 { 754 struct block_device *ddev = mp->m_super->s_bdev; 755 struct block_device *logdev = NULL, *rtdev = NULL; 756 int error; 757 758 /* 759 * Open real time and log devices - order is important. 760 */ 761 if (mp->m_logname) { 762 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 763 if (error) 764 goto out; 765 } 766 767 if (mp->m_rtname) { 768 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 769 if (error) 770 goto out_close_logdev; 771 772 if (rtdev == ddev || rtdev == logdev) { 773 xfs_warn(mp, 774 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 775 error = EINVAL; 776 goto out_close_rtdev; 777 } 778 } 779 780 /* 781 * Setup xfs_mount buffer target pointers 782 */ 783 error = ENOMEM; 784 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname); 785 if (!mp->m_ddev_targp) 786 goto out_close_rtdev; 787 788 if (rtdev) { 789 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1, 790 mp->m_fsname); 791 if (!mp->m_rtdev_targp) 792 goto out_free_ddev_targ; 793 } 794 795 if (logdev && logdev != ddev) { 796 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1, 797 mp->m_fsname); 798 if (!mp->m_logdev_targp) 799 goto out_free_rtdev_targ; 800 } else { 801 mp->m_logdev_targp = mp->m_ddev_targp; 802 } 803 804 return 0; 805 806 out_free_rtdev_targ: 807 if (mp->m_rtdev_targp) 808 xfs_free_buftarg(mp, mp->m_rtdev_targp); 809 out_free_ddev_targ: 810 xfs_free_buftarg(mp, mp->m_ddev_targp); 811 out_close_rtdev: 812 if (rtdev) 813 xfs_blkdev_put(rtdev); 814 out_close_logdev: 815 if (logdev && logdev != ddev) 816 xfs_blkdev_put(logdev); 817 out: 818 return error; 819 } 820 821 /* 822 * Setup xfs_mount buffer target pointers based on superblock 823 */ 824 STATIC int 825 xfs_setup_devices( 826 struct xfs_mount *mp) 827 { 828 int error; 829 830 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize, 831 mp->m_sb.sb_sectsize); 832 if (error) 833 return error; 834 835 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 836 unsigned int log_sector_size = BBSIZE; 837 838 if (xfs_sb_version_hassector(&mp->m_sb)) 839 log_sector_size = mp->m_sb.sb_logsectsize; 840 error = xfs_setsize_buftarg(mp->m_logdev_targp, 841 mp->m_sb.sb_blocksize, 842 log_sector_size); 843 if (error) 844 return error; 845 } 846 if (mp->m_rtdev_targp) { 847 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 848 mp->m_sb.sb_blocksize, 849 mp->m_sb.sb_sectsize); 850 if (error) 851 return error; 852 } 853 854 return 0; 855 } 856 857 STATIC int 858 xfs_init_mount_workqueues( 859 struct xfs_mount *mp) 860 { 861 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 862 WQ_MEM_RECLAIM, 0, mp->m_fsname); 863 if (!mp->m_data_workqueue) 864 goto out; 865 866 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 867 WQ_MEM_RECLAIM, 0, mp->m_fsname); 868 if (!mp->m_unwritten_workqueue) 869 goto out_destroy_data_iodone_queue; 870 871 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 872 WQ_MEM_RECLAIM, 0, mp->m_fsname); 873 if (!mp->m_cil_workqueue) 874 goto out_destroy_unwritten; 875 876 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s", 877 WQ_NON_REENTRANT, 0, mp->m_fsname); 878 if (!mp->m_reclaim_workqueue) 879 goto out_destroy_cil; 880 881 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s", 882 WQ_NON_REENTRANT, 0, mp->m_fsname); 883 if (!mp->m_log_workqueue) 884 goto out_destroy_reclaim; 885 886 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s", 887 WQ_NON_REENTRANT, 0, mp->m_fsname); 888 if (!mp->m_eofblocks_workqueue) 889 goto out_destroy_log; 890 891 return 0; 892 893 out_destroy_log: 894 destroy_workqueue(mp->m_log_workqueue); 895 out_destroy_reclaim: 896 destroy_workqueue(mp->m_reclaim_workqueue); 897 out_destroy_cil: 898 destroy_workqueue(mp->m_cil_workqueue); 899 out_destroy_unwritten: 900 destroy_workqueue(mp->m_unwritten_workqueue); 901 out_destroy_data_iodone_queue: 902 destroy_workqueue(mp->m_data_workqueue); 903 out: 904 return -ENOMEM; 905 } 906 907 STATIC void 908 xfs_destroy_mount_workqueues( 909 struct xfs_mount *mp) 910 { 911 destroy_workqueue(mp->m_eofblocks_workqueue); 912 destroy_workqueue(mp->m_log_workqueue); 913 destroy_workqueue(mp->m_reclaim_workqueue); 914 destroy_workqueue(mp->m_cil_workqueue); 915 destroy_workqueue(mp->m_data_workqueue); 916 destroy_workqueue(mp->m_unwritten_workqueue); 917 } 918 919 /* 920 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK 921 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting 922 * for IO to complete so that we effectively throttle multiple callers to the 923 * rate at which IO is completing. 924 */ 925 void 926 xfs_flush_inodes( 927 struct xfs_mount *mp) 928 { 929 struct super_block *sb = mp->m_super; 930 931 if (down_read_trylock(&sb->s_umount)) { 932 sync_inodes_sb(sb); 933 up_read(&sb->s_umount); 934 } 935 } 936 937 /* Catch misguided souls that try to use this interface on XFS */ 938 STATIC struct inode * 939 xfs_fs_alloc_inode( 940 struct super_block *sb) 941 { 942 BUG(); 943 return NULL; 944 } 945 946 /* 947 * Now that the generic code is guaranteed not to be accessing 948 * the linux inode, we can reclaim the inode. 949 */ 950 STATIC void 951 xfs_fs_destroy_inode( 952 struct inode *inode) 953 { 954 struct xfs_inode *ip = XFS_I(inode); 955 956 trace_xfs_destroy_inode(ip); 957 958 XFS_STATS_INC(vn_reclaim); 959 960 /* bad inode, get out here ASAP */ 961 if (is_bad_inode(inode)) 962 goto out_reclaim; 963 964 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 965 966 /* 967 * We should never get here with one of the reclaim flags already set. 968 */ 969 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 970 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 971 972 /* 973 * We always use background reclaim here because even if the 974 * inode is clean, it still may be under IO and hence we have 975 * to take the flush lock. The background reclaim path handles 976 * this more efficiently than we can here, so simply let background 977 * reclaim tear down all inodes. 978 */ 979 out_reclaim: 980 xfs_inode_set_reclaim_tag(ip); 981 } 982 983 /* 984 * Slab object creation initialisation for the XFS inode. 985 * This covers only the idempotent fields in the XFS inode; 986 * all other fields need to be initialised on allocation 987 * from the slab. This avoids the need to repeatedly initialise 988 * fields in the xfs inode that left in the initialise state 989 * when freeing the inode. 990 */ 991 STATIC void 992 xfs_fs_inode_init_once( 993 void *inode) 994 { 995 struct xfs_inode *ip = inode; 996 997 memset(ip, 0, sizeof(struct xfs_inode)); 998 999 /* vfs inode */ 1000 inode_init_once(VFS_I(ip)); 1001 1002 /* xfs inode */ 1003 atomic_set(&ip->i_pincount, 0); 1004 spin_lock_init(&ip->i_flags_lock); 1005 1006 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 1007 "xfsino", ip->i_ino); 1008 } 1009 1010 STATIC void 1011 xfs_fs_evict_inode( 1012 struct inode *inode) 1013 { 1014 xfs_inode_t *ip = XFS_I(inode); 1015 1016 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 1017 1018 trace_xfs_evict_inode(ip); 1019 1020 truncate_inode_pages(&inode->i_data, 0); 1021 clear_inode(inode); 1022 XFS_STATS_INC(vn_rele); 1023 XFS_STATS_INC(vn_remove); 1024 XFS_STATS_DEC(vn_active); 1025 1026 xfs_inactive(ip); 1027 } 1028 1029 /* 1030 * We do an unlocked check for XFS_IDONTCACHE here because we are already 1031 * serialised against cache hits here via the inode->i_lock and igrab() in 1032 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 1033 * racing with us, and it avoids needing to grab a spinlock here for every inode 1034 * we drop the final reference on. 1035 */ 1036 STATIC int 1037 xfs_fs_drop_inode( 1038 struct inode *inode) 1039 { 1040 struct xfs_inode *ip = XFS_I(inode); 1041 1042 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 1043 } 1044 1045 STATIC void 1046 xfs_free_fsname( 1047 struct xfs_mount *mp) 1048 { 1049 kfree(mp->m_fsname); 1050 kfree(mp->m_rtname); 1051 kfree(mp->m_logname); 1052 } 1053 1054 STATIC void 1055 xfs_fs_put_super( 1056 struct super_block *sb) 1057 { 1058 struct xfs_mount *mp = XFS_M(sb); 1059 1060 xfs_filestream_unmount(mp); 1061 xfs_unmountfs(mp); 1062 1063 xfs_freesb(mp); 1064 xfs_icsb_destroy_counters(mp); 1065 xfs_destroy_mount_workqueues(mp); 1066 xfs_close_devices(mp); 1067 xfs_free_fsname(mp); 1068 kfree(mp); 1069 } 1070 1071 STATIC int 1072 xfs_fs_sync_fs( 1073 struct super_block *sb, 1074 int wait) 1075 { 1076 struct xfs_mount *mp = XFS_M(sb); 1077 1078 /* 1079 * Doing anything during the async pass would be counterproductive. 1080 */ 1081 if (!wait) 1082 return 0; 1083 1084 xfs_log_force(mp, XFS_LOG_SYNC); 1085 if (laptop_mode) { 1086 /* 1087 * The disk must be active because we're syncing. 1088 * We schedule log work now (now that the disk is 1089 * active) instead of later (when it might not be). 1090 */ 1091 flush_delayed_work(&mp->m_log->l_work); 1092 } 1093 1094 return 0; 1095 } 1096 1097 STATIC int 1098 xfs_fs_statfs( 1099 struct dentry *dentry, 1100 struct kstatfs *statp) 1101 { 1102 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1103 xfs_sb_t *sbp = &mp->m_sb; 1104 struct xfs_inode *ip = XFS_I(dentry->d_inode); 1105 __uint64_t fakeinos, id; 1106 xfs_extlen_t lsize; 1107 __int64_t ffree; 1108 1109 statp->f_type = XFS_SB_MAGIC; 1110 statp->f_namelen = MAXNAMELEN - 1; 1111 1112 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1113 statp->f_fsid.val[0] = (u32)id; 1114 statp->f_fsid.val[1] = (u32)(id >> 32); 1115 1116 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 1117 1118 spin_lock(&mp->m_sb_lock); 1119 statp->f_bsize = sbp->sb_blocksize; 1120 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1121 statp->f_blocks = sbp->sb_dblocks - lsize; 1122 statp->f_bfree = statp->f_bavail = 1123 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 1124 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1125 statp->f_files = 1126 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1127 if (mp->m_maxicount) 1128 statp->f_files = min_t(typeof(statp->f_files), 1129 statp->f_files, 1130 mp->m_maxicount); 1131 1132 /* make sure statp->f_ffree does not underflow */ 1133 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree); 1134 statp->f_ffree = max_t(__int64_t, ffree, 0); 1135 1136 spin_unlock(&mp->m_sb_lock); 1137 1138 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1139 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) == 1140 (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD)) 1141 xfs_qm_statvfs(ip, statp); 1142 return 0; 1143 } 1144 1145 STATIC void 1146 xfs_save_resvblks(struct xfs_mount *mp) 1147 { 1148 __uint64_t resblks = 0; 1149 1150 mp->m_resblks_save = mp->m_resblks; 1151 xfs_reserve_blocks(mp, &resblks, NULL); 1152 } 1153 1154 STATIC void 1155 xfs_restore_resvblks(struct xfs_mount *mp) 1156 { 1157 __uint64_t resblks; 1158 1159 if (mp->m_resblks_save) { 1160 resblks = mp->m_resblks_save; 1161 mp->m_resblks_save = 0; 1162 } else 1163 resblks = xfs_default_resblks(mp); 1164 1165 xfs_reserve_blocks(mp, &resblks, NULL); 1166 } 1167 1168 /* 1169 * Trigger writeback of all the dirty metadata in the file system. 1170 * 1171 * This ensures that the metadata is written to their location on disk rather 1172 * than just existing in transactions in the log. This means after a quiesce 1173 * there is no log replay required to write the inodes to disk - this is the 1174 * primary difference between a sync and a quiesce. 1175 * 1176 * Note: xfs_log_quiesce() stops background log work - the callers must ensure 1177 * it is started again when appropriate. 1178 */ 1179 void 1180 xfs_quiesce_attr( 1181 struct xfs_mount *mp) 1182 { 1183 int error = 0; 1184 1185 /* wait for all modifications to complete */ 1186 while (atomic_read(&mp->m_active_trans) > 0) 1187 delay(100); 1188 1189 /* force the log to unpin objects from the now complete transactions */ 1190 xfs_log_force(mp, XFS_LOG_SYNC); 1191 1192 /* reclaim inodes to do any IO before the freeze completes */ 1193 xfs_reclaim_inodes(mp, 0); 1194 xfs_reclaim_inodes(mp, SYNC_WAIT); 1195 1196 /* Push the superblock and write an unmount record */ 1197 error = xfs_log_sbcount(mp); 1198 if (error) 1199 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. " 1200 "Frozen image may not be consistent."); 1201 /* 1202 * Just warn here till VFS can correctly support 1203 * read-only remount without racing. 1204 */ 1205 WARN_ON(atomic_read(&mp->m_active_trans) != 0); 1206 1207 xfs_log_quiesce(mp); 1208 } 1209 1210 STATIC int 1211 xfs_fs_remount( 1212 struct super_block *sb, 1213 int *flags, 1214 char *options) 1215 { 1216 struct xfs_mount *mp = XFS_M(sb); 1217 substring_t args[MAX_OPT_ARGS]; 1218 char *p; 1219 int error; 1220 1221 while ((p = strsep(&options, ",")) != NULL) { 1222 int token; 1223 1224 if (!*p) 1225 continue; 1226 1227 token = match_token(p, tokens, args); 1228 switch (token) { 1229 case Opt_barrier: 1230 mp->m_flags |= XFS_MOUNT_BARRIER; 1231 break; 1232 case Opt_nobarrier: 1233 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1234 break; 1235 case Opt_inode64: 1236 mp->m_maxagi = xfs_set_inode64(mp); 1237 break; 1238 case Opt_inode32: 1239 mp->m_maxagi = xfs_set_inode32(mp); 1240 break; 1241 default: 1242 /* 1243 * Logically we would return an error here to prevent 1244 * users from believing they might have changed 1245 * mount options using remount which can't be changed. 1246 * 1247 * But unfortunately mount(8) adds all options from 1248 * mtab and fstab to the mount arguments in some cases 1249 * so we can't blindly reject options, but have to 1250 * check for each specified option if it actually 1251 * differs from the currently set option and only 1252 * reject it if that's the case. 1253 * 1254 * Until that is implemented we return success for 1255 * every remount request, and silently ignore all 1256 * options that we can't actually change. 1257 */ 1258 #if 0 1259 xfs_info(mp, 1260 "mount option \"%s\" not supported for remount\n", p); 1261 return -EINVAL; 1262 #else 1263 break; 1264 #endif 1265 } 1266 } 1267 1268 /* ro -> rw */ 1269 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1270 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1271 1272 /* 1273 * If this is the first remount to writeable state we 1274 * might have some superblock changes to update. 1275 */ 1276 if (mp->m_update_flags) { 1277 error = xfs_mount_log_sb(mp, mp->m_update_flags); 1278 if (error) { 1279 xfs_warn(mp, "failed to write sb changes"); 1280 return error; 1281 } 1282 mp->m_update_flags = 0; 1283 } 1284 1285 /* 1286 * Fill out the reserve pool if it is empty. Use the stashed 1287 * value if it is non-zero, otherwise go with the default. 1288 */ 1289 xfs_restore_resvblks(mp); 1290 xfs_log_work_queue(mp); 1291 } 1292 1293 /* rw -> ro */ 1294 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1295 /* 1296 * Before we sync the metadata, we need to free up the reserve 1297 * block pool so that the used block count in the superblock on 1298 * disk is correct at the end of the remount. Stash the current 1299 * reserve pool size so that if we get remounted rw, we can 1300 * return it to the same size. 1301 */ 1302 xfs_save_resvblks(mp); 1303 xfs_quiesce_attr(mp); 1304 mp->m_flags |= XFS_MOUNT_RDONLY; 1305 } 1306 1307 return 0; 1308 } 1309 1310 /* 1311 * Second stage of a freeze. The data is already frozen so we only 1312 * need to take care of the metadata. Once that's done write a dummy 1313 * record to dirty the log in case of a crash while frozen. 1314 */ 1315 STATIC int 1316 xfs_fs_freeze( 1317 struct super_block *sb) 1318 { 1319 struct xfs_mount *mp = XFS_M(sb); 1320 1321 xfs_save_resvblks(mp); 1322 xfs_quiesce_attr(mp); 1323 return -xfs_fs_log_dummy(mp); 1324 } 1325 1326 STATIC int 1327 xfs_fs_unfreeze( 1328 struct super_block *sb) 1329 { 1330 struct xfs_mount *mp = XFS_M(sb); 1331 1332 xfs_restore_resvblks(mp); 1333 xfs_log_work_queue(mp); 1334 return 0; 1335 } 1336 1337 STATIC int 1338 xfs_fs_show_options( 1339 struct seq_file *m, 1340 struct dentry *root) 1341 { 1342 return -xfs_showargs(XFS_M(root->d_sb), m); 1343 } 1344 1345 /* 1346 * This function fills in xfs_mount_t fields based on mount args. 1347 * Note: the superblock _has_ now been read in. 1348 */ 1349 STATIC int 1350 xfs_finish_flags( 1351 struct xfs_mount *mp) 1352 { 1353 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1354 1355 /* Fail a mount where the logbuf is smaller than the log stripe */ 1356 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1357 if (mp->m_logbsize <= 0 && 1358 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1359 mp->m_logbsize = mp->m_sb.sb_logsunit; 1360 } else if (mp->m_logbsize > 0 && 1361 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1362 xfs_warn(mp, 1363 "logbuf size must be greater than or equal to log stripe size"); 1364 return XFS_ERROR(EINVAL); 1365 } 1366 } else { 1367 /* Fail a mount if the logbuf is larger than 32K */ 1368 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1369 xfs_warn(mp, 1370 "logbuf size for version 1 logs must be 16K or 32K"); 1371 return XFS_ERROR(EINVAL); 1372 } 1373 } 1374 1375 /* 1376 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1377 * told by noattr2 to turn it off 1378 */ 1379 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1380 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1381 mp->m_flags |= XFS_MOUNT_ATTR2; 1382 1383 /* 1384 * prohibit r/w mounts of read-only filesystems 1385 */ 1386 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1387 xfs_warn(mp, 1388 "cannot mount a read-only filesystem as read-write"); 1389 return XFS_ERROR(EROFS); 1390 } 1391 1392 return 0; 1393 } 1394 1395 STATIC int 1396 xfs_fs_fill_super( 1397 struct super_block *sb, 1398 void *data, 1399 int silent) 1400 { 1401 struct inode *root; 1402 struct xfs_mount *mp = NULL; 1403 int flags = 0, error = ENOMEM; 1404 1405 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1406 if (!mp) 1407 goto out; 1408 1409 spin_lock_init(&mp->m_sb_lock); 1410 mutex_init(&mp->m_growlock); 1411 atomic_set(&mp->m_active_trans, 0); 1412 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); 1413 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker); 1414 1415 mp->m_super = sb; 1416 sb->s_fs_info = mp; 1417 1418 error = xfs_parseargs(mp, (char *)data); 1419 if (error) 1420 goto out_free_fsname; 1421 1422 sb_min_blocksize(sb, BBSIZE); 1423 sb->s_xattr = xfs_xattr_handlers; 1424 sb->s_export_op = &xfs_export_operations; 1425 #ifdef CONFIG_XFS_QUOTA 1426 sb->s_qcop = &xfs_quotactl_operations; 1427 #endif 1428 sb->s_op = &xfs_super_operations; 1429 1430 if (silent) 1431 flags |= XFS_MFSI_QUIET; 1432 1433 error = xfs_open_devices(mp); 1434 if (error) 1435 goto out_free_fsname; 1436 1437 error = xfs_init_mount_workqueues(mp); 1438 if (error) 1439 goto out_close_devices; 1440 1441 error = xfs_icsb_init_counters(mp); 1442 if (error) 1443 goto out_destroy_workqueues; 1444 1445 error = xfs_readsb(mp, flags); 1446 if (error) 1447 goto out_destroy_counters; 1448 1449 error = xfs_finish_flags(mp); 1450 if (error) 1451 goto out_free_sb; 1452 1453 error = xfs_setup_devices(mp); 1454 if (error) 1455 goto out_free_sb; 1456 1457 error = xfs_filestream_mount(mp); 1458 if (error) 1459 goto out_free_sb; 1460 1461 /* 1462 * we must configure the block size in the superblock before we run the 1463 * full mount process as the mount process can lookup and cache inodes. 1464 */ 1465 sb->s_magic = XFS_SB_MAGIC; 1466 sb->s_blocksize = mp->m_sb.sb_blocksize; 1467 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1468 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1469 sb->s_max_links = XFS_MAXLINK; 1470 sb->s_time_gran = 1; 1471 set_posix_acl_flag(sb); 1472 1473 error = xfs_mountfs(mp); 1474 if (error) 1475 goto out_filestream_unmount; 1476 1477 root = igrab(VFS_I(mp->m_rootip)); 1478 if (!root) { 1479 error = ENOENT; 1480 goto out_unmount; 1481 } 1482 if (is_bad_inode(root)) { 1483 error = EINVAL; 1484 goto out_unmount; 1485 } 1486 sb->s_root = d_make_root(root); 1487 if (!sb->s_root) { 1488 error = ENOMEM; 1489 goto out_unmount; 1490 } 1491 1492 return 0; 1493 1494 out_filestream_unmount: 1495 xfs_filestream_unmount(mp); 1496 out_free_sb: 1497 xfs_freesb(mp); 1498 out_destroy_counters: 1499 xfs_icsb_destroy_counters(mp); 1500 out_destroy_workqueues: 1501 xfs_destroy_mount_workqueues(mp); 1502 out_close_devices: 1503 xfs_close_devices(mp); 1504 out_free_fsname: 1505 xfs_free_fsname(mp); 1506 kfree(mp); 1507 out: 1508 return -error; 1509 1510 out_unmount: 1511 xfs_filestream_unmount(mp); 1512 xfs_unmountfs(mp); 1513 goto out_free_sb; 1514 } 1515 1516 STATIC struct dentry * 1517 xfs_fs_mount( 1518 struct file_system_type *fs_type, 1519 int flags, 1520 const char *dev_name, 1521 void *data) 1522 { 1523 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1524 } 1525 1526 static int 1527 xfs_fs_nr_cached_objects( 1528 struct super_block *sb) 1529 { 1530 return xfs_reclaim_inodes_count(XFS_M(sb)); 1531 } 1532 1533 static void 1534 xfs_fs_free_cached_objects( 1535 struct super_block *sb, 1536 int nr_to_scan) 1537 { 1538 xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan); 1539 } 1540 1541 static const struct super_operations xfs_super_operations = { 1542 .alloc_inode = xfs_fs_alloc_inode, 1543 .destroy_inode = xfs_fs_destroy_inode, 1544 .evict_inode = xfs_fs_evict_inode, 1545 .drop_inode = xfs_fs_drop_inode, 1546 .put_super = xfs_fs_put_super, 1547 .sync_fs = xfs_fs_sync_fs, 1548 .freeze_fs = xfs_fs_freeze, 1549 .unfreeze_fs = xfs_fs_unfreeze, 1550 .statfs = xfs_fs_statfs, 1551 .remount_fs = xfs_fs_remount, 1552 .show_options = xfs_fs_show_options, 1553 .nr_cached_objects = xfs_fs_nr_cached_objects, 1554 .free_cached_objects = xfs_fs_free_cached_objects, 1555 }; 1556 1557 static struct file_system_type xfs_fs_type = { 1558 .owner = THIS_MODULE, 1559 .name = "xfs", 1560 .mount = xfs_fs_mount, 1561 .kill_sb = kill_block_super, 1562 .fs_flags = FS_REQUIRES_DEV, 1563 }; 1564 1565 STATIC int __init 1566 xfs_init_zones(void) 1567 { 1568 1569 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend"); 1570 if (!xfs_ioend_zone) 1571 goto out; 1572 1573 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE, 1574 xfs_ioend_zone); 1575 if (!xfs_ioend_pool) 1576 goto out_destroy_ioend_zone; 1577 1578 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1579 "xfs_log_ticket"); 1580 if (!xfs_log_ticket_zone) 1581 goto out_destroy_ioend_pool; 1582 1583 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), 1584 "xfs_bmap_free_item"); 1585 if (!xfs_bmap_free_item_zone) 1586 goto out_destroy_log_ticket_zone; 1587 1588 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1589 "xfs_btree_cur"); 1590 if (!xfs_btree_cur_zone) 1591 goto out_destroy_bmap_free_item_zone; 1592 1593 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1594 "xfs_da_state"); 1595 if (!xfs_da_state_zone) 1596 goto out_destroy_btree_cur_zone; 1597 1598 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1599 if (!xfs_ifork_zone) 1600 goto out_destroy_da_state_zone; 1601 1602 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1603 if (!xfs_trans_zone) 1604 goto out_destroy_ifork_zone; 1605 1606 xfs_log_item_desc_zone = 1607 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1608 "xfs_log_item_desc"); 1609 if (!xfs_log_item_desc_zone) 1610 goto out_destroy_trans_zone; 1611 1612 /* 1613 * The size of the zone allocated buf log item is the maximum 1614 * size possible under XFS. This wastes a little bit of memory, 1615 * but it is much faster. 1616 */ 1617 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item), 1618 "xfs_buf_item"); 1619 if (!xfs_buf_item_zone) 1620 goto out_destroy_log_item_desc_zone; 1621 1622 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1623 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1624 sizeof(xfs_extent_t))), "xfs_efd_item"); 1625 if (!xfs_efd_zone) 1626 goto out_destroy_buf_item_zone; 1627 1628 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1629 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1630 sizeof(xfs_extent_t))), "xfs_efi_item"); 1631 if (!xfs_efi_zone) 1632 goto out_destroy_efd_zone; 1633 1634 xfs_inode_zone = 1635 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1636 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD, 1637 xfs_fs_inode_init_once); 1638 if (!xfs_inode_zone) 1639 goto out_destroy_efi_zone; 1640 1641 xfs_ili_zone = 1642 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1643 KM_ZONE_SPREAD, NULL); 1644 if (!xfs_ili_zone) 1645 goto out_destroy_inode_zone; 1646 1647 return 0; 1648 1649 out_destroy_inode_zone: 1650 kmem_zone_destroy(xfs_inode_zone); 1651 out_destroy_efi_zone: 1652 kmem_zone_destroy(xfs_efi_zone); 1653 out_destroy_efd_zone: 1654 kmem_zone_destroy(xfs_efd_zone); 1655 out_destroy_buf_item_zone: 1656 kmem_zone_destroy(xfs_buf_item_zone); 1657 out_destroy_log_item_desc_zone: 1658 kmem_zone_destroy(xfs_log_item_desc_zone); 1659 out_destroy_trans_zone: 1660 kmem_zone_destroy(xfs_trans_zone); 1661 out_destroy_ifork_zone: 1662 kmem_zone_destroy(xfs_ifork_zone); 1663 out_destroy_da_state_zone: 1664 kmem_zone_destroy(xfs_da_state_zone); 1665 out_destroy_btree_cur_zone: 1666 kmem_zone_destroy(xfs_btree_cur_zone); 1667 out_destroy_bmap_free_item_zone: 1668 kmem_zone_destroy(xfs_bmap_free_item_zone); 1669 out_destroy_log_ticket_zone: 1670 kmem_zone_destroy(xfs_log_ticket_zone); 1671 out_destroy_ioend_pool: 1672 mempool_destroy(xfs_ioend_pool); 1673 out_destroy_ioend_zone: 1674 kmem_zone_destroy(xfs_ioend_zone); 1675 out: 1676 return -ENOMEM; 1677 } 1678 1679 STATIC void 1680 xfs_destroy_zones(void) 1681 { 1682 /* 1683 * Make sure all delayed rcu free are flushed before we 1684 * destroy caches. 1685 */ 1686 rcu_barrier(); 1687 kmem_zone_destroy(xfs_ili_zone); 1688 kmem_zone_destroy(xfs_inode_zone); 1689 kmem_zone_destroy(xfs_efi_zone); 1690 kmem_zone_destroy(xfs_efd_zone); 1691 kmem_zone_destroy(xfs_buf_item_zone); 1692 kmem_zone_destroy(xfs_log_item_desc_zone); 1693 kmem_zone_destroy(xfs_trans_zone); 1694 kmem_zone_destroy(xfs_ifork_zone); 1695 kmem_zone_destroy(xfs_da_state_zone); 1696 kmem_zone_destroy(xfs_btree_cur_zone); 1697 kmem_zone_destroy(xfs_bmap_free_item_zone); 1698 kmem_zone_destroy(xfs_log_ticket_zone); 1699 mempool_destroy(xfs_ioend_pool); 1700 kmem_zone_destroy(xfs_ioend_zone); 1701 1702 } 1703 1704 STATIC int __init 1705 xfs_init_workqueues(void) 1706 { 1707 /* 1708 * The allocation workqueue can be used in memory reclaim situations 1709 * (writepage path), and parallelism is only limited by the number of 1710 * AGs in all the filesystems mounted. Hence use the default large 1711 * max_active value for this workqueue. 1712 */ 1713 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0); 1714 if (!xfs_alloc_wq) 1715 return -ENOMEM; 1716 1717 return 0; 1718 } 1719 1720 STATIC void 1721 xfs_destroy_workqueues(void) 1722 { 1723 destroy_workqueue(xfs_alloc_wq); 1724 } 1725 1726 STATIC int __init 1727 init_xfs_fs(void) 1728 { 1729 int error; 1730 1731 printk(KERN_INFO XFS_VERSION_STRING " with " 1732 XFS_BUILD_OPTIONS " enabled\n"); 1733 1734 xfs_dir_startup(); 1735 1736 error = xfs_init_zones(); 1737 if (error) 1738 goto out; 1739 1740 error = xfs_init_workqueues(); 1741 if (error) 1742 goto out_destroy_zones; 1743 1744 error = xfs_mru_cache_init(); 1745 if (error) 1746 goto out_destroy_wq; 1747 1748 error = xfs_filestream_init(); 1749 if (error) 1750 goto out_mru_cache_uninit; 1751 1752 error = xfs_buf_init(); 1753 if (error) 1754 goto out_filestream_uninit; 1755 1756 error = xfs_init_procfs(); 1757 if (error) 1758 goto out_buf_terminate; 1759 1760 error = xfs_sysctl_register(); 1761 if (error) 1762 goto out_cleanup_procfs; 1763 1764 error = xfs_qm_init(); 1765 if (error) 1766 goto out_sysctl_unregister; 1767 1768 error = register_filesystem(&xfs_fs_type); 1769 if (error) 1770 goto out_qm_exit; 1771 return 0; 1772 1773 out_qm_exit: 1774 xfs_qm_exit(); 1775 out_sysctl_unregister: 1776 xfs_sysctl_unregister(); 1777 out_cleanup_procfs: 1778 xfs_cleanup_procfs(); 1779 out_buf_terminate: 1780 xfs_buf_terminate(); 1781 out_filestream_uninit: 1782 xfs_filestream_uninit(); 1783 out_mru_cache_uninit: 1784 xfs_mru_cache_uninit(); 1785 out_destroy_wq: 1786 xfs_destroy_workqueues(); 1787 out_destroy_zones: 1788 xfs_destroy_zones(); 1789 out: 1790 return error; 1791 } 1792 1793 STATIC void __exit 1794 exit_xfs_fs(void) 1795 { 1796 xfs_qm_exit(); 1797 unregister_filesystem(&xfs_fs_type); 1798 xfs_sysctl_unregister(); 1799 xfs_cleanup_procfs(); 1800 xfs_buf_terminate(); 1801 xfs_filestream_uninit(); 1802 xfs_mru_cache_uninit(); 1803 xfs_destroy_workqueues(); 1804 xfs_destroy_zones(); 1805 } 1806 1807 module_init(init_xfs_fs); 1808 module_exit(exit_xfs_fs); 1809 1810 MODULE_AUTHOR("Silicon Graphics, Inc."); 1811 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1812 MODULE_LICENSE("GPL"); 1813