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_inum.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_mount.h" 28 #include "xfs_da_format.h" 29 #include "xfs_inode.h" 30 #include "xfs_btree.h" 31 #include "xfs_bmap.h" 32 #include "xfs_alloc.h" 33 #include "xfs_error.h" 34 #include "xfs_fsops.h" 35 #include "xfs_trans.h" 36 #include "xfs_buf_item.h" 37 #include "xfs_log.h" 38 #include "xfs_log_priv.h" 39 #include "xfs_da_btree.h" 40 #include "xfs_dir2.h" 41 #include "xfs_extfree_item.h" 42 #include "xfs_mru_cache.h" 43 #include "xfs_inode_item.h" 44 #include "xfs_icache.h" 45 #include "xfs_trace.h" 46 #include "xfs_icreate_item.h" 47 #include "xfs_dinode.h" 48 #include "xfs_filestream.h" 49 #include "xfs_quota.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 static kmem_zone_t *xfs_ioend_zone; 63 mempool_t *xfs_ioend_pool; 64 struct kset *xfs_kset; 65 66 #define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */ 67 #define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */ 68 #define MNTOPT_LOGDEV "logdev" /* log device */ 69 #define MNTOPT_RTDEV "rtdev" /* realtime I/O device */ 70 #define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */ 71 #define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */ 72 #define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */ 73 #define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */ 74 #define MNTOPT_SUNIT "sunit" /* data volume stripe unit */ 75 #define MNTOPT_SWIDTH "swidth" /* data volume stripe width */ 76 #define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */ 77 #define MNTOPT_MTPT "mtpt" /* filesystem mount point */ 78 #define MNTOPT_GRPID "grpid" /* group-ID from parent directory */ 79 #define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */ 80 #define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */ 81 #define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */ 82 #define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */ 83 #define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */ 84 #define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and 85 * unwritten extent conversion */ 86 #define MNTOPT_NOBARRIER "nobarrier" /* .. disable */ 87 #define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */ 88 #define MNTOPT_32BITINODE "inode32" /* inode allocation limited to 89 * XFS_MAXINUMBER_32 */ 90 #define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */ 91 #define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ 92 #define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */ 93 #define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes 94 * in stat(). */ 95 #define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */ 96 #define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */ 97 #define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */ 98 #define MNTOPT_QUOTA "quota" /* disk quotas (user) */ 99 #define MNTOPT_NOQUOTA "noquota" /* no quotas */ 100 #define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */ 101 #define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */ 102 #define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */ 103 #define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */ 104 #define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */ 105 #define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */ 106 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */ 107 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */ 108 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */ 109 #define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */ 110 #define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */ 111 #define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */ 112 #define MNTOPT_DISCARD "discard" /* Discard unused blocks */ 113 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */ 114 115 /* 116 * Table driven mount option parser. 117 * 118 * Currently only used for remount, but it will be used for mount 119 * in the future, too. 120 */ 121 enum { 122 Opt_barrier, 123 Opt_nobarrier, 124 Opt_inode64, 125 Opt_inode32, 126 Opt_err 127 }; 128 129 static const match_table_t tokens = { 130 {Opt_barrier, "barrier"}, 131 {Opt_nobarrier, "nobarrier"}, 132 {Opt_inode64, "inode64"}, 133 {Opt_inode32, "inode32"}, 134 {Opt_err, NULL} 135 }; 136 137 138 STATIC unsigned long 139 suffix_kstrtoint(char *s, unsigned int base, int *res) 140 { 141 int last, shift_left_factor = 0, _res; 142 char *value = s; 143 144 last = strlen(value) - 1; 145 if (value[last] == 'K' || value[last] == 'k') { 146 shift_left_factor = 10; 147 value[last] = '\0'; 148 } 149 if (value[last] == 'M' || value[last] == 'm') { 150 shift_left_factor = 20; 151 value[last] = '\0'; 152 } 153 if (value[last] == 'G' || value[last] == 'g') { 154 shift_left_factor = 30; 155 value[last] = '\0'; 156 } 157 158 if (kstrtoint(s, base, &_res)) 159 return -EINVAL; 160 *res = _res << shift_left_factor; 161 return 0; 162 } 163 164 /* 165 * This function fills in xfs_mount_t fields based on mount args. 166 * Note: the superblock has _not_ yet been read in. 167 * 168 * Note that this function leaks the various device name allocations on 169 * failure. The caller takes care of them. 170 */ 171 STATIC int 172 xfs_parseargs( 173 struct xfs_mount *mp, 174 char *options) 175 { 176 struct super_block *sb = mp->m_super; 177 char *this_char, *value; 178 int dsunit = 0; 179 int dswidth = 0; 180 int iosize = 0; 181 __uint8_t iosizelog = 0; 182 183 /* 184 * set up the mount name first so all the errors will refer to the 185 * correct device. 186 */ 187 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL); 188 if (!mp->m_fsname) 189 return -ENOMEM; 190 mp->m_fsname_len = strlen(mp->m_fsname) + 1; 191 192 /* 193 * Copy binary VFS mount flags we are interested in. 194 */ 195 if (sb->s_flags & MS_RDONLY) 196 mp->m_flags |= XFS_MOUNT_RDONLY; 197 if (sb->s_flags & MS_DIRSYNC) 198 mp->m_flags |= XFS_MOUNT_DIRSYNC; 199 if (sb->s_flags & MS_SYNCHRONOUS) 200 mp->m_flags |= XFS_MOUNT_WSYNC; 201 202 /* 203 * Set some default flags that could be cleared by the mount option 204 * parsing. 205 */ 206 mp->m_flags |= XFS_MOUNT_BARRIER; 207 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 208 209 /* 210 * These can be overridden by the mount option parsing. 211 */ 212 mp->m_logbufs = -1; 213 mp->m_logbsize = -1; 214 215 if (!options) 216 goto done; 217 218 while ((this_char = strsep(&options, ",")) != NULL) { 219 if (!*this_char) 220 continue; 221 if ((value = strchr(this_char, '=')) != NULL) 222 *value++ = 0; 223 224 if (!strcmp(this_char, MNTOPT_LOGBUFS)) { 225 if (!value || !*value) { 226 xfs_warn(mp, "%s option requires an argument", 227 this_char); 228 return -EINVAL; 229 } 230 if (kstrtoint(value, 10, &mp->m_logbufs)) 231 return -EINVAL; 232 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) { 233 if (!value || !*value) { 234 xfs_warn(mp, "%s option requires an argument", 235 this_char); 236 return -EINVAL; 237 } 238 if (suffix_kstrtoint(value, 10, &mp->m_logbsize)) 239 return -EINVAL; 240 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { 241 if (!value || !*value) { 242 xfs_warn(mp, "%s option requires an argument", 243 this_char); 244 return -EINVAL; 245 } 246 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 247 if (!mp->m_logname) 248 return -ENOMEM; 249 } else if (!strcmp(this_char, MNTOPT_MTPT)) { 250 xfs_warn(mp, "%s option not allowed on this system", 251 this_char); 252 return -EINVAL; 253 } else if (!strcmp(this_char, MNTOPT_RTDEV)) { 254 if (!value || !*value) { 255 xfs_warn(mp, "%s option requires an argument", 256 this_char); 257 return -EINVAL; 258 } 259 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 260 if (!mp->m_rtname) 261 return -ENOMEM; 262 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) { 263 if (!value || !*value) { 264 xfs_warn(mp, "%s option requires an argument", 265 this_char); 266 return -EINVAL; 267 } 268 if (kstrtoint(value, 10, &iosize)) 269 return -EINVAL; 270 iosizelog = ffs(iosize) - 1; 271 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) { 272 if (!value || !*value) { 273 xfs_warn(mp, "%s option requires an argument", 274 this_char); 275 return -EINVAL; 276 } 277 if (suffix_kstrtoint(value, 10, &iosize)) 278 return -EINVAL; 279 iosizelog = ffs(iosize) - 1; 280 } else if (!strcmp(this_char, MNTOPT_GRPID) || 281 !strcmp(this_char, MNTOPT_BSDGROUPS)) { 282 mp->m_flags |= XFS_MOUNT_GRPID; 283 } else if (!strcmp(this_char, MNTOPT_NOGRPID) || 284 !strcmp(this_char, MNTOPT_SYSVGROUPS)) { 285 mp->m_flags &= ~XFS_MOUNT_GRPID; 286 } else if (!strcmp(this_char, MNTOPT_WSYNC)) { 287 mp->m_flags |= XFS_MOUNT_WSYNC; 288 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { 289 mp->m_flags |= XFS_MOUNT_NORECOVERY; 290 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { 291 mp->m_flags |= XFS_MOUNT_NOALIGN; 292 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { 293 mp->m_flags |= XFS_MOUNT_SWALLOC; 294 } else if (!strcmp(this_char, MNTOPT_SUNIT)) { 295 if (!value || !*value) { 296 xfs_warn(mp, "%s option requires an argument", 297 this_char); 298 return -EINVAL; 299 } 300 if (kstrtoint(value, 10, &dsunit)) 301 return -EINVAL; 302 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { 303 if (!value || !*value) { 304 xfs_warn(mp, "%s option requires an argument", 305 this_char); 306 return -EINVAL; 307 } 308 if (kstrtoint(value, 10, &dswidth)) 309 return -EINVAL; 310 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) { 311 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 312 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { 313 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 314 } else if (!strcmp(this_char, MNTOPT_NOUUID)) { 315 mp->m_flags |= XFS_MOUNT_NOUUID; 316 } else if (!strcmp(this_char, MNTOPT_BARRIER)) { 317 mp->m_flags |= XFS_MOUNT_BARRIER; 318 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) { 319 mp->m_flags &= ~XFS_MOUNT_BARRIER; 320 } else if (!strcmp(this_char, MNTOPT_IKEEP)) { 321 mp->m_flags |= XFS_MOUNT_IKEEP; 322 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { 323 mp->m_flags &= ~XFS_MOUNT_IKEEP; 324 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) { 325 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 326 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) { 327 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 328 } else if (!strcmp(this_char, MNTOPT_ATTR2)) { 329 mp->m_flags |= XFS_MOUNT_ATTR2; 330 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) { 331 mp->m_flags &= ~XFS_MOUNT_ATTR2; 332 mp->m_flags |= XFS_MOUNT_NOATTR2; 333 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) { 334 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 335 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) { 336 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 337 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 338 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 339 } else if (!strcmp(this_char, MNTOPT_QUOTA) || 340 !strcmp(this_char, MNTOPT_UQUOTA) || 341 !strcmp(this_char, MNTOPT_USRQUOTA)) { 342 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 343 XFS_UQUOTA_ENFD); 344 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) || 345 !strcmp(this_char, MNTOPT_UQUOTANOENF)) { 346 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 347 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 348 } else if (!strcmp(this_char, MNTOPT_PQUOTA) || 349 !strcmp(this_char, MNTOPT_PRJQUOTA)) { 350 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 351 XFS_PQUOTA_ENFD); 352 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) { 353 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 354 mp->m_qflags &= ~XFS_PQUOTA_ENFD; 355 } else if (!strcmp(this_char, MNTOPT_GQUOTA) || 356 !strcmp(this_char, MNTOPT_GRPQUOTA)) { 357 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 358 XFS_GQUOTA_ENFD); 359 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) { 360 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 361 mp->m_qflags &= ~XFS_GQUOTA_ENFD; 362 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) { 363 xfs_warn(mp, 364 "delaylog is the default now, option is deprecated."); 365 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) { 366 xfs_warn(mp, 367 "nodelaylog support has been removed, option is deprecated."); 368 } else if (!strcmp(this_char, MNTOPT_DISCARD)) { 369 mp->m_flags |= XFS_MOUNT_DISCARD; 370 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) { 371 mp->m_flags &= ~XFS_MOUNT_DISCARD; 372 } else if (!strcmp(this_char, "ihashsize")) { 373 xfs_warn(mp, 374 "ihashsize no longer used, option is deprecated."); 375 } else if (!strcmp(this_char, "osyncisdsync")) { 376 xfs_warn(mp, 377 "osyncisdsync has no effect, option is deprecated."); 378 } else if (!strcmp(this_char, "osyncisosync")) { 379 xfs_warn(mp, 380 "osyncisosync has no effect, option is deprecated."); 381 } else if (!strcmp(this_char, "irixsgid")) { 382 xfs_warn(mp, 383 "irixsgid is now a sysctl(2) variable, option is deprecated."); 384 } else { 385 xfs_warn(mp, "unknown mount option [%s].", this_char); 386 return -EINVAL; 387 } 388 } 389 390 /* 391 * no recovery flag requires a read-only mount 392 */ 393 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 394 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 395 xfs_warn(mp, "no-recovery mounts must be read-only."); 396 return -EINVAL; 397 } 398 399 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 400 xfs_warn(mp, 401 "sunit and swidth options incompatible with the noalign option"); 402 return -EINVAL; 403 } 404 405 #ifndef CONFIG_XFS_QUOTA 406 if (XFS_IS_QUOTA_RUNNING(mp)) { 407 xfs_warn(mp, "quota support not available in this kernel."); 408 return -EINVAL; 409 } 410 #endif 411 412 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 413 xfs_warn(mp, "sunit and swidth must be specified together"); 414 return -EINVAL; 415 } 416 417 if (dsunit && (dswidth % dsunit != 0)) { 418 xfs_warn(mp, 419 "stripe width (%d) must be a multiple of the stripe unit (%d)", 420 dswidth, dsunit); 421 return -EINVAL; 422 } 423 424 done: 425 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) { 426 /* 427 * At this point the superblock has not been read 428 * in, therefore we do not know the block size. 429 * Before the mount call ends we will convert 430 * these to FSBs. 431 */ 432 mp->m_dalign = dsunit; 433 mp->m_swidth = dswidth; 434 } 435 436 if (mp->m_logbufs != -1 && 437 mp->m_logbufs != 0 && 438 (mp->m_logbufs < XLOG_MIN_ICLOGS || 439 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 440 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 441 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 442 return -EINVAL; 443 } 444 if (mp->m_logbsize != -1 && 445 mp->m_logbsize != 0 && 446 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 447 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 448 !is_power_of_2(mp->m_logbsize))) { 449 xfs_warn(mp, 450 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 451 mp->m_logbsize); 452 return -EINVAL; 453 } 454 455 if (iosizelog) { 456 if (iosizelog > XFS_MAX_IO_LOG || 457 iosizelog < XFS_MIN_IO_LOG) { 458 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 459 iosizelog, XFS_MIN_IO_LOG, 460 XFS_MAX_IO_LOG); 461 return -EINVAL; 462 } 463 464 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 465 mp->m_readio_log = iosizelog; 466 mp->m_writeio_log = iosizelog; 467 } 468 469 return 0; 470 } 471 472 struct proc_xfs_info { 473 int flag; 474 char *str; 475 }; 476 477 STATIC int 478 xfs_showargs( 479 struct xfs_mount *mp, 480 struct seq_file *m) 481 { 482 static struct proc_xfs_info xfs_info_set[] = { 483 /* the few simple ones we can get from the mount struct */ 484 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP }, 485 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, 486 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, 487 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, 488 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, 489 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, 490 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 }, 491 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM }, 492 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID }, 493 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD }, 494 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE }, 495 { 0, NULL } 496 }; 497 static struct proc_xfs_info xfs_info_unset[] = { 498 /* the few simple ones we can get from the mount struct */ 499 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO }, 500 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER }, 501 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE }, 502 { 0, NULL } 503 }; 504 struct proc_xfs_info *xfs_infop; 505 506 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { 507 if (mp->m_flags & xfs_infop->flag) 508 seq_puts(m, xfs_infop->str); 509 } 510 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) { 511 if (!(mp->m_flags & xfs_infop->flag)) 512 seq_puts(m, xfs_infop->str); 513 } 514 515 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) 516 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk", 517 (int)(1 << mp->m_writeio_log) >> 10); 518 519 if (mp->m_logbufs > 0) 520 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs); 521 if (mp->m_logbsize > 0) 522 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10); 523 524 if (mp->m_logname) 525 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname); 526 if (mp->m_rtname) 527 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname); 528 529 if (mp->m_dalign > 0) 530 seq_printf(m, "," MNTOPT_SUNIT "=%d", 531 (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); 532 if (mp->m_swidth > 0) 533 seq_printf(m, "," MNTOPT_SWIDTH "=%d", 534 (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); 535 536 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD)) 537 seq_puts(m, "," MNTOPT_USRQUOTA); 538 else if (mp->m_qflags & XFS_UQUOTA_ACCT) 539 seq_puts(m, "," MNTOPT_UQUOTANOENF); 540 541 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 542 if (mp->m_qflags & XFS_PQUOTA_ENFD) 543 seq_puts(m, "," MNTOPT_PRJQUOTA); 544 else 545 seq_puts(m, "," MNTOPT_PQUOTANOENF); 546 } 547 if (mp->m_qflags & XFS_GQUOTA_ACCT) { 548 if (mp->m_qflags & XFS_GQUOTA_ENFD) 549 seq_puts(m, "," MNTOPT_GRPQUOTA); 550 else 551 seq_puts(m, "," MNTOPT_GQUOTANOENF); 552 } 553 554 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 555 seq_puts(m, "," MNTOPT_NOQUOTA); 556 557 return 0; 558 } 559 __uint64_t 560 xfs_max_file_offset( 561 unsigned int blockshift) 562 { 563 unsigned int pagefactor = 1; 564 unsigned int bitshift = BITS_PER_LONG - 1; 565 566 /* Figure out maximum filesize, on Linux this can depend on 567 * the filesystem blocksize (on 32 bit platforms). 568 * __block_write_begin does this in an [unsigned] long... 569 * page->index << (PAGE_CACHE_SHIFT - bbits) 570 * So, for page sized blocks (4K on 32 bit platforms), 571 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 572 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 573 * but for smaller blocksizes it is less (bbits = log2 bsize). 574 * Note1: get_block_t takes a long (implicit cast from above) 575 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 576 * can optionally convert the [unsigned] long from above into 577 * an [unsigned] long long. 578 */ 579 580 #if BITS_PER_LONG == 32 581 # if defined(CONFIG_LBDAF) 582 ASSERT(sizeof(sector_t) == 8); 583 pagefactor = PAGE_CACHE_SIZE; 584 bitshift = BITS_PER_LONG; 585 # else 586 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); 587 # endif 588 #endif 589 590 return (((__uint64_t)pagefactor) << bitshift) - 1; 591 } 592 593 /* 594 * xfs_set_inode32() and xfs_set_inode64() are passed an agcount 595 * because in the growfs case, mp->m_sb.sb_agcount is not updated 596 * yet to the potentially higher ag count. 597 */ 598 xfs_agnumber_t 599 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount) 600 { 601 xfs_agnumber_t index = 0; 602 xfs_agnumber_t maxagi = 0; 603 xfs_sb_t *sbp = &mp->m_sb; 604 xfs_agnumber_t max_metadata; 605 xfs_agino_t agino; 606 xfs_ino_t ino; 607 xfs_perag_t *pag; 608 609 /* Calculate how much should be reserved for inodes to meet 610 * the max inode percentage. 611 */ 612 if (mp->m_maxicount) { 613 __uint64_t icount; 614 615 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 616 do_div(icount, 100); 617 icount += sbp->sb_agblocks - 1; 618 do_div(icount, sbp->sb_agblocks); 619 max_metadata = icount; 620 } else { 621 max_metadata = agcount; 622 } 623 624 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); 625 626 for (index = 0; index < agcount; index++) { 627 ino = XFS_AGINO_TO_INO(mp, index, agino); 628 629 if (ino > XFS_MAXINUMBER_32) { 630 pag = xfs_perag_get(mp, index); 631 pag->pagi_inodeok = 0; 632 pag->pagf_metadata = 0; 633 xfs_perag_put(pag); 634 continue; 635 } 636 637 pag = xfs_perag_get(mp, index); 638 pag->pagi_inodeok = 1; 639 maxagi++; 640 if (index < max_metadata) 641 pag->pagf_metadata = 1; 642 xfs_perag_put(pag); 643 } 644 mp->m_flags |= (XFS_MOUNT_32BITINODES | 645 XFS_MOUNT_SMALL_INUMS); 646 647 return maxagi; 648 } 649 650 xfs_agnumber_t 651 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount) 652 { 653 xfs_agnumber_t index = 0; 654 655 for (index = 0; index < agcount; index++) { 656 struct xfs_perag *pag; 657 658 pag = xfs_perag_get(mp, index); 659 pag->pagi_inodeok = 1; 660 pag->pagf_metadata = 0; 661 xfs_perag_put(pag); 662 } 663 664 /* There is no need for lock protection on m_flags, 665 * the rw_semaphore of the VFS superblock is locked 666 * during mount/umount/remount operations, so this is 667 * enough to avoid concurency on the m_flags field 668 */ 669 mp->m_flags &= ~(XFS_MOUNT_32BITINODES | 670 XFS_MOUNT_SMALL_INUMS); 671 return index; 672 } 673 674 STATIC int 675 xfs_blkdev_get( 676 xfs_mount_t *mp, 677 const char *name, 678 struct block_device **bdevp) 679 { 680 int error = 0; 681 682 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 683 mp); 684 if (IS_ERR(*bdevp)) { 685 error = PTR_ERR(*bdevp); 686 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error); 687 } 688 689 return error; 690 } 691 692 STATIC void 693 xfs_blkdev_put( 694 struct block_device *bdev) 695 { 696 if (bdev) 697 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 698 } 699 700 void 701 xfs_blkdev_issue_flush( 702 xfs_buftarg_t *buftarg) 703 { 704 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 705 } 706 707 STATIC void 708 xfs_close_devices( 709 struct xfs_mount *mp) 710 { 711 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 712 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 713 xfs_free_buftarg(mp, mp->m_logdev_targp); 714 xfs_blkdev_put(logdev); 715 } 716 if (mp->m_rtdev_targp) { 717 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 718 xfs_free_buftarg(mp, mp->m_rtdev_targp); 719 xfs_blkdev_put(rtdev); 720 } 721 xfs_free_buftarg(mp, mp->m_ddev_targp); 722 } 723 724 /* 725 * The file system configurations are: 726 * (1) device (partition) with data and internal log 727 * (2) logical volume with data and log subvolumes. 728 * (3) logical volume with data, log, and realtime subvolumes. 729 * 730 * We only have to handle opening the log and realtime volumes here if 731 * they are present. The data subvolume has already been opened by 732 * get_sb_bdev() and is stored in sb->s_bdev. 733 */ 734 STATIC int 735 xfs_open_devices( 736 struct xfs_mount *mp) 737 { 738 struct block_device *ddev = mp->m_super->s_bdev; 739 struct block_device *logdev = NULL, *rtdev = NULL; 740 int error; 741 742 /* 743 * Open real time and log devices - order is important. 744 */ 745 if (mp->m_logname) { 746 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 747 if (error) 748 goto out; 749 } 750 751 if (mp->m_rtname) { 752 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 753 if (error) 754 goto out_close_logdev; 755 756 if (rtdev == ddev || rtdev == logdev) { 757 xfs_warn(mp, 758 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 759 error = -EINVAL; 760 goto out_close_rtdev; 761 } 762 } 763 764 /* 765 * Setup xfs_mount buffer target pointers 766 */ 767 error = -ENOMEM; 768 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev); 769 if (!mp->m_ddev_targp) 770 goto out_close_rtdev; 771 772 if (rtdev) { 773 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev); 774 if (!mp->m_rtdev_targp) 775 goto out_free_ddev_targ; 776 } 777 778 if (logdev && logdev != ddev) { 779 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev); 780 if (!mp->m_logdev_targp) 781 goto out_free_rtdev_targ; 782 } else { 783 mp->m_logdev_targp = mp->m_ddev_targp; 784 } 785 786 return 0; 787 788 out_free_rtdev_targ: 789 if (mp->m_rtdev_targp) 790 xfs_free_buftarg(mp, mp->m_rtdev_targp); 791 out_free_ddev_targ: 792 xfs_free_buftarg(mp, mp->m_ddev_targp); 793 out_close_rtdev: 794 if (rtdev) 795 xfs_blkdev_put(rtdev); 796 out_close_logdev: 797 if (logdev && logdev != ddev) 798 xfs_blkdev_put(logdev); 799 out: 800 return error; 801 } 802 803 /* 804 * Setup xfs_mount buffer target pointers based on superblock 805 */ 806 STATIC int 807 xfs_setup_devices( 808 struct xfs_mount *mp) 809 { 810 int error; 811 812 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize); 813 if (error) 814 return error; 815 816 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 817 unsigned int log_sector_size = BBSIZE; 818 819 if (xfs_sb_version_hassector(&mp->m_sb)) 820 log_sector_size = mp->m_sb.sb_logsectsize; 821 error = xfs_setsize_buftarg(mp->m_logdev_targp, 822 log_sector_size); 823 if (error) 824 return error; 825 } 826 if (mp->m_rtdev_targp) { 827 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 828 mp->m_sb.sb_sectsize); 829 if (error) 830 return error; 831 } 832 833 return 0; 834 } 835 836 STATIC int 837 xfs_init_mount_workqueues( 838 struct xfs_mount *mp) 839 { 840 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 841 WQ_MEM_RECLAIM, 0, mp->m_fsname); 842 if (!mp->m_data_workqueue) 843 goto out; 844 845 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 846 WQ_MEM_RECLAIM, 0, mp->m_fsname); 847 if (!mp->m_unwritten_workqueue) 848 goto out_destroy_data_iodone_queue; 849 850 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 851 WQ_MEM_RECLAIM, 0, mp->m_fsname); 852 if (!mp->m_cil_workqueue) 853 goto out_destroy_unwritten; 854 855 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s", 856 0, 0, mp->m_fsname); 857 if (!mp->m_reclaim_workqueue) 858 goto out_destroy_cil; 859 860 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s", 861 0, 0, mp->m_fsname); 862 if (!mp->m_log_workqueue) 863 goto out_destroy_reclaim; 864 865 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s", 866 0, 0, mp->m_fsname); 867 if (!mp->m_eofblocks_workqueue) 868 goto out_destroy_log; 869 870 return 0; 871 872 out_destroy_log: 873 destroy_workqueue(mp->m_log_workqueue); 874 out_destroy_reclaim: 875 destroy_workqueue(mp->m_reclaim_workqueue); 876 out_destroy_cil: 877 destroy_workqueue(mp->m_cil_workqueue); 878 out_destroy_unwritten: 879 destroy_workqueue(mp->m_unwritten_workqueue); 880 out_destroy_data_iodone_queue: 881 destroy_workqueue(mp->m_data_workqueue); 882 out: 883 return -ENOMEM; 884 } 885 886 STATIC void 887 xfs_destroy_mount_workqueues( 888 struct xfs_mount *mp) 889 { 890 destroy_workqueue(mp->m_eofblocks_workqueue); 891 destroy_workqueue(mp->m_log_workqueue); 892 destroy_workqueue(mp->m_reclaim_workqueue); 893 destroy_workqueue(mp->m_cil_workqueue); 894 destroy_workqueue(mp->m_data_workqueue); 895 destroy_workqueue(mp->m_unwritten_workqueue); 896 } 897 898 /* 899 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK 900 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting 901 * for IO to complete so that we effectively throttle multiple callers to the 902 * rate at which IO is completing. 903 */ 904 void 905 xfs_flush_inodes( 906 struct xfs_mount *mp) 907 { 908 struct super_block *sb = mp->m_super; 909 910 if (down_read_trylock(&sb->s_umount)) { 911 sync_inodes_sb(sb); 912 up_read(&sb->s_umount); 913 } 914 } 915 916 /* Catch misguided souls that try to use this interface on XFS */ 917 STATIC struct inode * 918 xfs_fs_alloc_inode( 919 struct super_block *sb) 920 { 921 BUG(); 922 return NULL; 923 } 924 925 /* 926 * Now that the generic code is guaranteed not to be accessing 927 * the linux inode, we can reclaim the inode. 928 */ 929 STATIC void 930 xfs_fs_destroy_inode( 931 struct inode *inode) 932 { 933 struct xfs_inode *ip = XFS_I(inode); 934 935 trace_xfs_destroy_inode(ip); 936 937 XFS_STATS_INC(vn_reclaim); 938 939 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 940 941 /* 942 * We should never get here with one of the reclaim flags already set. 943 */ 944 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 945 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 946 947 /* 948 * We always use background reclaim here because even if the 949 * inode is clean, it still may be under IO and hence we have 950 * to take the flush lock. The background reclaim path handles 951 * this more efficiently than we can here, so simply let background 952 * reclaim tear down all inodes. 953 */ 954 xfs_inode_set_reclaim_tag(ip); 955 } 956 957 /* 958 * Slab object creation initialisation for the XFS inode. 959 * This covers only the idempotent fields in the XFS inode; 960 * all other fields need to be initialised on allocation 961 * from the slab. This avoids the need to repeatedly initialise 962 * fields in the xfs inode that left in the initialise state 963 * when freeing the inode. 964 */ 965 STATIC void 966 xfs_fs_inode_init_once( 967 void *inode) 968 { 969 struct xfs_inode *ip = inode; 970 971 memset(ip, 0, sizeof(struct xfs_inode)); 972 973 /* vfs inode */ 974 inode_init_once(VFS_I(ip)); 975 976 /* xfs inode */ 977 atomic_set(&ip->i_pincount, 0); 978 spin_lock_init(&ip->i_flags_lock); 979 980 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 981 "xfsino", ip->i_ino); 982 } 983 984 STATIC void 985 xfs_fs_evict_inode( 986 struct inode *inode) 987 { 988 xfs_inode_t *ip = XFS_I(inode); 989 990 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 991 992 trace_xfs_evict_inode(ip); 993 994 truncate_inode_pages_final(&inode->i_data); 995 clear_inode(inode); 996 XFS_STATS_INC(vn_rele); 997 XFS_STATS_INC(vn_remove); 998 XFS_STATS_DEC(vn_active); 999 1000 xfs_inactive(ip); 1001 } 1002 1003 /* 1004 * We do an unlocked check for XFS_IDONTCACHE here because we are already 1005 * serialised against cache hits here via the inode->i_lock and igrab() in 1006 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 1007 * racing with us, and it avoids needing to grab a spinlock here for every inode 1008 * we drop the final reference on. 1009 */ 1010 STATIC int 1011 xfs_fs_drop_inode( 1012 struct inode *inode) 1013 { 1014 struct xfs_inode *ip = XFS_I(inode); 1015 1016 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 1017 } 1018 1019 STATIC void 1020 xfs_free_fsname( 1021 struct xfs_mount *mp) 1022 { 1023 kfree(mp->m_fsname); 1024 kfree(mp->m_rtname); 1025 kfree(mp->m_logname); 1026 } 1027 1028 STATIC void 1029 xfs_fs_put_super( 1030 struct super_block *sb) 1031 { 1032 struct xfs_mount *mp = XFS_M(sb); 1033 1034 xfs_filestream_unmount(mp); 1035 xfs_unmountfs(mp); 1036 1037 xfs_freesb(mp); 1038 xfs_icsb_destroy_counters(mp); 1039 xfs_destroy_mount_workqueues(mp); 1040 xfs_close_devices(mp); 1041 xfs_free_fsname(mp); 1042 kfree(mp); 1043 } 1044 1045 STATIC int 1046 xfs_fs_sync_fs( 1047 struct super_block *sb, 1048 int wait) 1049 { 1050 struct xfs_mount *mp = XFS_M(sb); 1051 1052 /* 1053 * Doing anything during the async pass would be counterproductive. 1054 */ 1055 if (!wait) 1056 return 0; 1057 1058 xfs_log_force(mp, XFS_LOG_SYNC); 1059 if (laptop_mode) { 1060 /* 1061 * The disk must be active because we're syncing. 1062 * We schedule log work now (now that the disk is 1063 * active) instead of later (when it might not be). 1064 */ 1065 flush_delayed_work(&mp->m_log->l_work); 1066 } 1067 1068 return 0; 1069 } 1070 1071 STATIC int 1072 xfs_fs_statfs( 1073 struct dentry *dentry, 1074 struct kstatfs *statp) 1075 { 1076 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1077 xfs_sb_t *sbp = &mp->m_sb; 1078 struct xfs_inode *ip = XFS_I(dentry->d_inode); 1079 __uint64_t fakeinos, id; 1080 xfs_extlen_t lsize; 1081 __int64_t ffree; 1082 1083 statp->f_type = XFS_SB_MAGIC; 1084 statp->f_namelen = MAXNAMELEN - 1; 1085 1086 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1087 statp->f_fsid.val[0] = (u32)id; 1088 statp->f_fsid.val[1] = (u32)(id >> 32); 1089 1090 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 1091 1092 spin_lock(&mp->m_sb_lock); 1093 statp->f_bsize = sbp->sb_blocksize; 1094 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1095 statp->f_blocks = sbp->sb_dblocks - lsize; 1096 statp->f_bfree = statp->f_bavail = 1097 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 1098 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1099 statp->f_files = 1100 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1101 if (mp->m_maxicount) 1102 statp->f_files = min_t(typeof(statp->f_files), 1103 statp->f_files, 1104 mp->m_maxicount); 1105 1106 /* make sure statp->f_ffree does not underflow */ 1107 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree); 1108 statp->f_ffree = max_t(__int64_t, ffree, 0); 1109 1110 spin_unlock(&mp->m_sb_lock); 1111 1112 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1113 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) == 1114 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD)) 1115 xfs_qm_statvfs(ip, statp); 1116 return 0; 1117 } 1118 1119 STATIC void 1120 xfs_save_resvblks(struct xfs_mount *mp) 1121 { 1122 __uint64_t resblks = 0; 1123 1124 mp->m_resblks_save = mp->m_resblks; 1125 xfs_reserve_blocks(mp, &resblks, NULL); 1126 } 1127 1128 STATIC void 1129 xfs_restore_resvblks(struct xfs_mount *mp) 1130 { 1131 __uint64_t resblks; 1132 1133 if (mp->m_resblks_save) { 1134 resblks = mp->m_resblks_save; 1135 mp->m_resblks_save = 0; 1136 } else 1137 resblks = xfs_default_resblks(mp); 1138 1139 xfs_reserve_blocks(mp, &resblks, NULL); 1140 } 1141 1142 /* 1143 * Trigger writeback of all the dirty metadata in the file system. 1144 * 1145 * This ensures that the metadata is written to their location on disk rather 1146 * than just existing in transactions in the log. This means after a quiesce 1147 * there is no log replay required to write the inodes to disk - this is the 1148 * primary difference between a sync and a quiesce. 1149 * 1150 * Note: xfs_log_quiesce() stops background log work - the callers must ensure 1151 * it is started again when appropriate. 1152 */ 1153 static void 1154 xfs_quiesce_attr( 1155 struct xfs_mount *mp) 1156 { 1157 int error = 0; 1158 1159 /* wait for all modifications to complete */ 1160 while (atomic_read(&mp->m_active_trans) > 0) 1161 delay(100); 1162 1163 /* force the log to unpin objects from the now complete transactions */ 1164 xfs_log_force(mp, XFS_LOG_SYNC); 1165 1166 /* reclaim inodes to do any IO before the freeze completes */ 1167 xfs_reclaim_inodes(mp, 0); 1168 xfs_reclaim_inodes(mp, SYNC_WAIT); 1169 1170 /* Push the superblock and write an unmount record */ 1171 error = xfs_log_sbcount(mp); 1172 if (error) 1173 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. " 1174 "Frozen image may not be consistent."); 1175 /* 1176 * Just warn here till VFS can correctly support 1177 * read-only remount without racing. 1178 */ 1179 WARN_ON(atomic_read(&mp->m_active_trans) != 0); 1180 1181 xfs_log_quiesce(mp); 1182 } 1183 1184 STATIC int 1185 xfs_fs_remount( 1186 struct super_block *sb, 1187 int *flags, 1188 char *options) 1189 { 1190 struct xfs_mount *mp = XFS_M(sb); 1191 xfs_sb_t *sbp = &mp->m_sb; 1192 substring_t args[MAX_OPT_ARGS]; 1193 char *p; 1194 int error; 1195 1196 sync_filesystem(sb); 1197 while ((p = strsep(&options, ",")) != NULL) { 1198 int token; 1199 1200 if (!*p) 1201 continue; 1202 1203 token = match_token(p, tokens, args); 1204 switch (token) { 1205 case Opt_barrier: 1206 mp->m_flags |= XFS_MOUNT_BARRIER; 1207 break; 1208 case Opt_nobarrier: 1209 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1210 break; 1211 case Opt_inode64: 1212 mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount); 1213 break; 1214 case Opt_inode32: 1215 mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount); 1216 break; 1217 default: 1218 /* 1219 * Logically we would return an error here to prevent 1220 * users from believing they might have changed 1221 * mount options using remount which can't be changed. 1222 * 1223 * But unfortunately mount(8) adds all options from 1224 * mtab and fstab to the mount arguments in some cases 1225 * so we can't blindly reject options, but have to 1226 * check for each specified option if it actually 1227 * differs from the currently set option and only 1228 * reject it if that's the case. 1229 * 1230 * Until that is implemented we return success for 1231 * every remount request, and silently ignore all 1232 * options that we can't actually change. 1233 */ 1234 #if 0 1235 xfs_info(mp, 1236 "mount option \"%s\" not supported for remount", p); 1237 return -EINVAL; 1238 #else 1239 break; 1240 #endif 1241 } 1242 } 1243 1244 /* ro -> rw */ 1245 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1246 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1247 1248 /* 1249 * If this is the first remount to writeable state we 1250 * might have some superblock changes to update. 1251 */ 1252 if (mp->m_update_flags) { 1253 error = xfs_mount_log_sb(mp, mp->m_update_flags); 1254 if (error) { 1255 xfs_warn(mp, "failed to write sb changes"); 1256 return error; 1257 } 1258 mp->m_update_flags = 0; 1259 } 1260 1261 /* 1262 * Fill out the reserve pool if it is empty. Use the stashed 1263 * value if it is non-zero, otherwise go with the default. 1264 */ 1265 xfs_restore_resvblks(mp); 1266 xfs_log_work_queue(mp); 1267 } 1268 1269 /* rw -> ro */ 1270 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1271 /* 1272 * Before we sync the metadata, we need to free up the reserve 1273 * block pool so that the used block count in the superblock on 1274 * disk is correct at the end of the remount. Stash the current 1275 * reserve pool size so that if we get remounted rw, we can 1276 * return it to the same size. 1277 */ 1278 xfs_save_resvblks(mp); 1279 xfs_quiesce_attr(mp); 1280 mp->m_flags |= XFS_MOUNT_RDONLY; 1281 } 1282 1283 return 0; 1284 } 1285 1286 /* 1287 * Second stage of a freeze. The data is already frozen so we only 1288 * need to take care of the metadata. Once that's done write a dummy 1289 * record to dirty the log in case of a crash while frozen. 1290 */ 1291 STATIC int 1292 xfs_fs_freeze( 1293 struct super_block *sb) 1294 { 1295 struct xfs_mount *mp = XFS_M(sb); 1296 1297 xfs_save_resvblks(mp); 1298 xfs_quiesce_attr(mp); 1299 return xfs_fs_log_dummy(mp); 1300 } 1301 1302 STATIC int 1303 xfs_fs_unfreeze( 1304 struct super_block *sb) 1305 { 1306 struct xfs_mount *mp = XFS_M(sb); 1307 1308 xfs_restore_resvblks(mp); 1309 xfs_log_work_queue(mp); 1310 return 0; 1311 } 1312 1313 STATIC int 1314 xfs_fs_show_options( 1315 struct seq_file *m, 1316 struct dentry *root) 1317 { 1318 return xfs_showargs(XFS_M(root->d_sb), m); 1319 } 1320 1321 /* 1322 * This function fills in xfs_mount_t fields based on mount args. 1323 * Note: the superblock _has_ now been read in. 1324 */ 1325 STATIC int 1326 xfs_finish_flags( 1327 struct xfs_mount *mp) 1328 { 1329 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1330 1331 /* Fail a mount where the logbuf is smaller than the log stripe */ 1332 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1333 if (mp->m_logbsize <= 0 && 1334 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1335 mp->m_logbsize = mp->m_sb.sb_logsunit; 1336 } else if (mp->m_logbsize > 0 && 1337 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1338 xfs_warn(mp, 1339 "logbuf size must be greater than or equal to log stripe size"); 1340 return -EINVAL; 1341 } 1342 } else { 1343 /* Fail a mount if the logbuf is larger than 32K */ 1344 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1345 xfs_warn(mp, 1346 "logbuf size for version 1 logs must be 16K or 32K"); 1347 return -EINVAL; 1348 } 1349 } 1350 1351 /* 1352 * V5 filesystems always use attr2 format for attributes. 1353 */ 1354 if (xfs_sb_version_hascrc(&mp->m_sb) && 1355 (mp->m_flags & XFS_MOUNT_NOATTR2)) { 1356 xfs_warn(mp, 1357 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.", 1358 MNTOPT_NOATTR2, MNTOPT_ATTR2); 1359 return -EINVAL; 1360 } 1361 1362 /* 1363 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1364 * told by noattr2 to turn it off 1365 */ 1366 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1367 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1368 mp->m_flags |= XFS_MOUNT_ATTR2; 1369 1370 /* 1371 * prohibit r/w mounts of read-only filesystems 1372 */ 1373 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1374 xfs_warn(mp, 1375 "cannot mount a read-only filesystem as read-write"); 1376 return -EROFS; 1377 } 1378 1379 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 1380 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) && 1381 !xfs_sb_version_has_pquotino(&mp->m_sb)) { 1382 xfs_warn(mp, 1383 "Super block does not support project and group quota together"); 1384 return -EINVAL; 1385 } 1386 1387 return 0; 1388 } 1389 1390 STATIC int 1391 xfs_fs_fill_super( 1392 struct super_block *sb, 1393 void *data, 1394 int silent) 1395 { 1396 struct inode *root; 1397 struct xfs_mount *mp = NULL; 1398 int flags = 0, error = -ENOMEM; 1399 1400 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1401 if (!mp) 1402 goto out; 1403 1404 spin_lock_init(&mp->m_sb_lock); 1405 mutex_init(&mp->m_growlock); 1406 atomic_set(&mp->m_active_trans, 0); 1407 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); 1408 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker); 1409 1410 mp->m_super = sb; 1411 sb->s_fs_info = mp; 1412 1413 error = xfs_parseargs(mp, (char *)data); 1414 if (error) 1415 goto out_free_fsname; 1416 1417 sb_min_blocksize(sb, BBSIZE); 1418 sb->s_xattr = xfs_xattr_handlers; 1419 sb->s_export_op = &xfs_export_operations; 1420 #ifdef CONFIG_XFS_QUOTA 1421 sb->s_qcop = &xfs_quotactl_operations; 1422 #endif 1423 sb->s_op = &xfs_super_operations; 1424 1425 if (silent) 1426 flags |= XFS_MFSI_QUIET; 1427 1428 error = xfs_open_devices(mp); 1429 if (error) 1430 goto out_free_fsname; 1431 1432 error = xfs_init_mount_workqueues(mp); 1433 if (error) 1434 goto out_close_devices; 1435 1436 error = xfs_icsb_init_counters(mp); 1437 if (error) 1438 goto out_destroy_workqueues; 1439 1440 error = xfs_readsb(mp, flags); 1441 if (error) 1442 goto out_destroy_counters; 1443 1444 error = xfs_finish_flags(mp); 1445 if (error) 1446 goto out_free_sb; 1447 1448 error = xfs_setup_devices(mp); 1449 if (error) 1450 goto out_free_sb; 1451 1452 error = xfs_filestream_mount(mp); 1453 if (error) 1454 goto out_free_sb; 1455 1456 /* 1457 * we must configure the block size in the superblock before we run the 1458 * full mount process as the mount process can lookup and cache inodes. 1459 */ 1460 sb->s_magic = XFS_SB_MAGIC; 1461 sb->s_blocksize = mp->m_sb.sb_blocksize; 1462 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1463 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1464 sb->s_max_links = XFS_MAXLINK; 1465 sb->s_time_gran = 1; 1466 set_posix_acl_flag(sb); 1467 1468 /* version 5 superblocks support inode version counters. */ 1469 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5) 1470 sb->s_flags |= MS_I_VERSION; 1471 1472 error = xfs_mountfs(mp); 1473 if (error) 1474 goto out_filestream_unmount; 1475 1476 root = igrab(VFS_I(mp->m_rootip)); 1477 if (!root) { 1478 error = -ENOENT; 1479 goto out_unmount; 1480 } 1481 sb->s_root = d_make_root(root); 1482 if (!sb->s_root) { 1483 error = -ENOMEM; 1484 goto out_unmount; 1485 } 1486 1487 return 0; 1488 1489 out_filestream_unmount: 1490 xfs_filestream_unmount(mp); 1491 out_free_sb: 1492 xfs_freesb(mp); 1493 out_destroy_counters: 1494 xfs_icsb_destroy_counters(mp); 1495 out_destroy_workqueues: 1496 xfs_destroy_mount_workqueues(mp); 1497 out_close_devices: 1498 xfs_close_devices(mp); 1499 out_free_fsname: 1500 xfs_free_fsname(mp); 1501 kfree(mp); 1502 out: 1503 return error; 1504 1505 out_unmount: 1506 xfs_filestream_unmount(mp); 1507 xfs_unmountfs(mp); 1508 goto out_free_sb; 1509 } 1510 1511 STATIC struct dentry * 1512 xfs_fs_mount( 1513 struct file_system_type *fs_type, 1514 int flags, 1515 const char *dev_name, 1516 void *data) 1517 { 1518 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1519 } 1520 1521 static long 1522 xfs_fs_nr_cached_objects( 1523 struct super_block *sb, 1524 int nid) 1525 { 1526 return xfs_reclaim_inodes_count(XFS_M(sb)); 1527 } 1528 1529 static long 1530 xfs_fs_free_cached_objects( 1531 struct super_block *sb, 1532 long nr_to_scan, 1533 int nid) 1534 { 1535 return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan); 1536 } 1537 1538 static const struct super_operations xfs_super_operations = { 1539 .alloc_inode = xfs_fs_alloc_inode, 1540 .destroy_inode = xfs_fs_destroy_inode, 1541 .evict_inode = xfs_fs_evict_inode, 1542 .drop_inode = xfs_fs_drop_inode, 1543 .put_super = xfs_fs_put_super, 1544 .sync_fs = xfs_fs_sync_fs, 1545 .freeze_fs = xfs_fs_freeze, 1546 .unfreeze_fs = xfs_fs_unfreeze, 1547 .statfs = xfs_fs_statfs, 1548 .remount_fs = xfs_fs_remount, 1549 .show_options = xfs_fs_show_options, 1550 .nr_cached_objects = xfs_fs_nr_cached_objects, 1551 .free_cached_objects = xfs_fs_free_cached_objects, 1552 }; 1553 1554 static struct file_system_type xfs_fs_type = { 1555 .owner = THIS_MODULE, 1556 .name = "xfs", 1557 .mount = xfs_fs_mount, 1558 .kill_sb = kill_block_super, 1559 .fs_flags = FS_REQUIRES_DEV, 1560 }; 1561 MODULE_ALIAS_FS("xfs"); 1562 1563 STATIC int __init 1564 xfs_init_zones(void) 1565 { 1566 1567 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend"); 1568 if (!xfs_ioend_zone) 1569 goto out; 1570 1571 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE, 1572 xfs_ioend_zone); 1573 if (!xfs_ioend_pool) 1574 goto out_destroy_ioend_zone; 1575 1576 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1577 "xfs_log_ticket"); 1578 if (!xfs_log_ticket_zone) 1579 goto out_destroy_ioend_pool; 1580 1581 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), 1582 "xfs_bmap_free_item"); 1583 if (!xfs_bmap_free_item_zone) 1584 goto out_destroy_log_ticket_zone; 1585 1586 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1587 "xfs_btree_cur"); 1588 if (!xfs_btree_cur_zone) 1589 goto out_destroy_bmap_free_item_zone; 1590 1591 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1592 "xfs_da_state"); 1593 if (!xfs_da_state_zone) 1594 goto out_destroy_btree_cur_zone; 1595 1596 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1597 if (!xfs_ifork_zone) 1598 goto out_destroy_da_state_zone; 1599 1600 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1601 if (!xfs_trans_zone) 1602 goto out_destroy_ifork_zone; 1603 1604 xfs_log_item_desc_zone = 1605 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1606 "xfs_log_item_desc"); 1607 if (!xfs_log_item_desc_zone) 1608 goto out_destroy_trans_zone; 1609 1610 /* 1611 * The size of the zone allocated buf log item is the maximum 1612 * size possible under XFS. This wastes a little bit of memory, 1613 * but it is much faster. 1614 */ 1615 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item), 1616 "xfs_buf_item"); 1617 if (!xfs_buf_item_zone) 1618 goto out_destroy_log_item_desc_zone; 1619 1620 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1621 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1622 sizeof(xfs_extent_t))), "xfs_efd_item"); 1623 if (!xfs_efd_zone) 1624 goto out_destroy_buf_item_zone; 1625 1626 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1627 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1628 sizeof(xfs_extent_t))), "xfs_efi_item"); 1629 if (!xfs_efi_zone) 1630 goto out_destroy_efd_zone; 1631 1632 xfs_inode_zone = 1633 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1634 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD, 1635 xfs_fs_inode_init_once); 1636 if (!xfs_inode_zone) 1637 goto out_destroy_efi_zone; 1638 1639 xfs_ili_zone = 1640 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1641 KM_ZONE_SPREAD, NULL); 1642 if (!xfs_ili_zone) 1643 goto out_destroy_inode_zone; 1644 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item), 1645 "xfs_icr"); 1646 if (!xfs_icreate_zone) 1647 goto out_destroy_ili_zone; 1648 1649 return 0; 1650 1651 out_destroy_ili_zone: 1652 kmem_zone_destroy(xfs_ili_zone); 1653 out_destroy_inode_zone: 1654 kmem_zone_destroy(xfs_inode_zone); 1655 out_destroy_efi_zone: 1656 kmem_zone_destroy(xfs_efi_zone); 1657 out_destroy_efd_zone: 1658 kmem_zone_destroy(xfs_efd_zone); 1659 out_destroy_buf_item_zone: 1660 kmem_zone_destroy(xfs_buf_item_zone); 1661 out_destroy_log_item_desc_zone: 1662 kmem_zone_destroy(xfs_log_item_desc_zone); 1663 out_destroy_trans_zone: 1664 kmem_zone_destroy(xfs_trans_zone); 1665 out_destroy_ifork_zone: 1666 kmem_zone_destroy(xfs_ifork_zone); 1667 out_destroy_da_state_zone: 1668 kmem_zone_destroy(xfs_da_state_zone); 1669 out_destroy_btree_cur_zone: 1670 kmem_zone_destroy(xfs_btree_cur_zone); 1671 out_destroy_bmap_free_item_zone: 1672 kmem_zone_destroy(xfs_bmap_free_item_zone); 1673 out_destroy_log_ticket_zone: 1674 kmem_zone_destroy(xfs_log_ticket_zone); 1675 out_destroy_ioend_pool: 1676 mempool_destroy(xfs_ioend_pool); 1677 out_destroy_ioend_zone: 1678 kmem_zone_destroy(xfs_ioend_zone); 1679 out: 1680 return -ENOMEM; 1681 } 1682 1683 STATIC void 1684 xfs_destroy_zones(void) 1685 { 1686 /* 1687 * Make sure all delayed rcu free are flushed before we 1688 * destroy caches. 1689 */ 1690 rcu_barrier(); 1691 kmem_zone_destroy(xfs_icreate_zone); 1692 kmem_zone_destroy(xfs_ili_zone); 1693 kmem_zone_destroy(xfs_inode_zone); 1694 kmem_zone_destroy(xfs_efi_zone); 1695 kmem_zone_destroy(xfs_efd_zone); 1696 kmem_zone_destroy(xfs_buf_item_zone); 1697 kmem_zone_destroy(xfs_log_item_desc_zone); 1698 kmem_zone_destroy(xfs_trans_zone); 1699 kmem_zone_destroy(xfs_ifork_zone); 1700 kmem_zone_destroy(xfs_da_state_zone); 1701 kmem_zone_destroy(xfs_btree_cur_zone); 1702 kmem_zone_destroy(xfs_bmap_free_item_zone); 1703 kmem_zone_destroy(xfs_log_ticket_zone); 1704 mempool_destroy(xfs_ioend_pool); 1705 kmem_zone_destroy(xfs_ioend_zone); 1706 1707 } 1708 1709 STATIC int __init 1710 xfs_init_workqueues(void) 1711 { 1712 /* 1713 * The allocation workqueue can be used in memory reclaim situations 1714 * (writepage path), and parallelism is only limited by the number of 1715 * AGs in all the filesystems mounted. Hence use the default large 1716 * max_active value for this workqueue. 1717 */ 1718 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0); 1719 if (!xfs_alloc_wq) 1720 return -ENOMEM; 1721 1722 return 0; 1723 } 1724 1725 STATIC void 1726 xfs_destroy_workqueues(void) 1727 { 1728 destroy_workqueue(xfs_alloc_wq); 1729 } 1730 1731 STATIC int __init 1732 init_xfs_fs(void) 1733 { 1734 int error; 1735 1736 printk(KERN_INFO XFS_VERSION_STRING " with " 1737 XFS_BUILD_OPTIONS " enabled\n"); 1738 1739 xfs_dir_startup(); 1740 1741 error = xfs_init_zones(); 1742 if (error) 1743 goto out; 1744 1745 error = xfs_init_workqueues(); 1746 if (error) 1747 goto out_destroy_zones; 1748 1749 error = xfs_mru_cache_init(); 1750 if (error) 1751 goto out_destroy_wq; 1752 1753 error = xfs_buf_init(); 1754 if (error) 1755 goto out_mru_cache_uninit; 1756 1757 error = xfs_init_procfs(); 1758 if (error) 1759 goto out_buf_terminate; 1760 1761 error = xfs_sysctl_register(); 1762 if (error) 1763 goto out_cleanup_procfs; 1764 1765 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj); 1766 if (!xfs_kset) { 1767 error = -ENOMEM; 1768 goto out_sysctl_unregister;; 1769 } 1770 1771 error = xfs_qm_init(); 1772 if (error) 1773 goto out_kset_unregister; 1774 1775 error = register_filesystem(&xfs_fs_type); 1776 if (error) 1777 goto out_qm_exit; 1778 return 0; 1779 1780 out_qm_exit: 1781 xfs_qm_exit(); 1782 out_kset_unregister: 1783 kset_unregister(xfs_kset); 1784 out_sysctl_unregister: 1785 xfs_sysctl_unregister(); 1786 out_cleanup_procfs: 1787 xfs_cleanup_procfs(); 1788 out_buf_terminate: 1789 xfs_buf_terminate(); 1790 out_mru_cache_uninit: 1791 xfs_mru_cache_uninit(); 1792 out_destroy_wq: 1793 xfs_destroy_workqueues(); 1794 out_destroy_zones: 1795 xfs_destroy_zones(); 1796 out: 1797 return error; 1798 } 1799 1800 STATIC void __exit 1801 exit_xfs_fs(void) 1802 { 1803 xfs_qm_exit(); 1804 unregister_filesystem(&xfs_fs_type); 1805 kset_unregister(xfs_kset); 1806 xfs_sysctl_unregister(); 1807 xfs_cleanup_procfs(); 1808 xfs_buf_terminate(); 1809 xfs_mru_cache_uninit(); 1810 xfs_destroy_workqueues(); 1811 xfs_destroy_zones(); 1812 } 1813 1814 module_init(init_xfs_fs); 1815 module_exit(exit_xfs_fs); 1816 1817 MODULE_AUTHOR("Silicon Graphics, Inc."); 1818 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1819 MODULE_LICENSE("GPL"); 1820