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_sync.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_IKEEP "ikeep" /* do not free empty inode clusters */ 92 #define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ 93 #define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */ 94 #define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes 95 * in stat(). */ 96 #define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */ 97 #define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */ 98 #define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */ 99 #define MNTOPT_QUOTA "quota" /* disk quotas (user) */ 100 #define MNTOPT_NOQUOTA "noquota" /* no quotas */ 101 #define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */ 102 #define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */ 103 #define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */ 104 #define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */ 105 #define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */ 106 #define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */ 107 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */ 108 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */ 109 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */ 110 #define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */ 111 #define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */ 112 #define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */ 113 #define MNTOPT_DISCARD "discard" /* Discard unused blocks */ 114 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */ 115 116 /* 117 * Table driven mount option parser. 118 * 119 * Currently only used for remount, but it will be used for mount 120 * in the future, too. 121 */ 122 enum { 123 Opt_barrier, Opt_nobarrier, Opt_err 124 }; 125 126 static const match_table_t tokens = { 127 {Opt_barrier, "barrier"}, 128 {Opt_nobarrier, "nobarrier"}, 129 {Opt_err, NULL} 130 }; 131 132 133 STATIC unsigned long 134 suffix_strtoul(char *s, char **endp, unsigned int base) 135 { 136 int last, shift_left_factor = 0; 137 char *value = s; 138 139 last = strlen(value) - 1; 140 if (value[last] == 'K' || value[last] == 'k') { 141 shift_left_factor = 10; 142 value[last] = '\0'; 143 } 144 if (value[last] == 'M' || value[last] == 'm') { 145 shift_left_factor = 20; 146 value[last] = '\0'; 147 } 148 if (value[last] == 'G' || value[last] == 'g') { 149 shift_left_factor = 30; 150 value[last] = '\0'; 151 } 152 153 return simple_strtoul((const char *)s, endp, base) << shift_left_factor; 154 } 155 156 /* 157 * This function fills in xfs_mount_t fields based on mount args. 158 * Note: the superblock has _not_ yet been read in. 159 * 160 * Note that this function leaks the various device name allocations on 161 * failure. The caller takes care of them. 162 */ 163 STATIC int 164 xfs_parseargs( 165 struct xfs_mount *mp, 166 char *options) 167 { 168 struct super_block *sb = mp->m_super; 169 char *this_char, *value, *eov; 170 int dsunit = 0; 171 int dswidth = 0; 172 int iosize = 0; 173 __uint8_t iosizelog = 0; 174 175 /* 176 * set up the mount name first so all the errors will refer to the 177 * correct device. 178 */ 179 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL); 180 if (!mp->m_fsname) 181 return ENOMEM; 182 mp->m_fsname_len = strlen(mp->m_fsname) + 1; 183 184 /* 185 * Copy binary VFS mount flags we are interested in. 186 */ 187 if (sb->s_flags & MS_RDONLY) 188 mp->m_flags |= XFS_MOUNT_RDONLY; 189 if (sb->s_flags & MS_DIRSYNC) 190 mp->m_flags |= XFS_MOUNT_DIRSYNC; 191 if (sb->s_flags & MS_SYNCHRONOUS) 192 mp->m_flags |= XFS_MOUNT_WSYNC; 193 194 /* 195 * Set some default flags that could be cleared by the mount option 196 * parsing. 197 */ 198 mp->m_flags |= XFS_MOUNT_BARRIER; 199 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 200 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 201 202 /* 203 * These can be overridden by the mount option parsing. 204 */ 205 mp->m_logbufs = -1; 206 mp->m_logbsize = -1; 207 208 if (!options) 209 goto done; 210 211 while ((this_char = strsep(&options, ",")) != NULL) { 212 if (!*this_char) 213 continue; 214 if ((value = strchr(this_char, '=')) != NULL) 215 *value++ = 0; 216 217 if (!strcmp(this_char, MNTOPT_LOGBUFS)) { 218 if (!value || !*value) { 219 xfs_warn(mp, "%s option requires an argument", 220 this_char); 221 return EINVAL; 222 } 223 mp->m_logbufs = simple_strtoul(value, &eov, 10); 224 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) { 225 if (!value || !*value) { 226 xfs_warn(mp, "%s option requires an argument", 227 this_char); 228 return EINVAL; 229 } 230 mp->m_logbsize = suffix_strtoul(value, &eov, 10); 231 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { 232 if (!value || !*value) { 233 xfs_warn(mp, "%s option requires an argument", 234 this_char); 235 return EINVAL; 236 } 237 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 238 if (!mp->m_logname) 239 return ENOMEM; 240 } else if (!strcmp(this_char, MNTOPT_MTPT)) { 241 xfs_warn(mp, "%s option not allowed on this system", 242 this_char); 243 return EINVAL; 244 } else if (!strcmp(this_char, MNTOPT_RTDEV)) { 245 if (!value || !*value) { 246 xfs_warn(mp, "%s option requires an argument", 247 this_char); 248 return EINVAL; 249 } 250 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 251 if (!mp->m_rtname) 252 return ENOMEM; 253 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) { 254 if (!value || !*value) { 255 xfs_warn(mp, "%s option requires an argument", 256 this_char); 257 return EINVAL; 258 } 259 iosize = simple_strtoul(value, &eov, 10); 260 iosizelog = ffs(iosize) - 1; 261 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) { 262 if (!value || !*value) { 263 xfs_warn(mp, "%s option requires an argument", 264 this_char); 265 return EINVAL; 266 } 267 iosize = suffix_strtoul(value, &eov, 10); 268 iosizelog = ffs(iosize) - 1; 269 } else if (!strcmp(this_char, MNTOPT_GRPID) || 270 !strcmp(this_char, MNTOPT_BSDGROUPS)) { 271 mp->m_flags |= XFS_MOUNT_GRPID; 272 } else if (!strcmp(this_char, MNTOPT_NOGRPID) || 273 !strcmp(this_char, MNTOPT_SYSVGROUPS)) { 274 mp->m_flags &= ~XFS_MOUNT_GRPID; 275 } else if (!strcmp(this_char, MNTOPT_WSYNC)) { 276 mp->m_flags |= XFS_MOUNT_WSYNC; 277 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { 278 mp->m_flags |= XFS_MOUNT_NORECOVERY; 279 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { 280 mp->m_flags |= XFS_MOUNT_NOALIGN; 281 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { 282 mp->m_flags |= XFS_MOUNT_SWALLOC; 283 } else if (!strcmp(this_char, MNTOPT_SUNIT)) { 284 if (!value || !*value) { 285 xfs_warn(mp, "%s option requires an argument", 286 this_char); 287 return EINVAL; 288 } 289 dsunit = simple_strtoul(value, &eov, 10); 290 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { 291 if (!value || !*value) { 292 xfs_warn(mp, "%s option requires an argument", 293 this_char); 294 return EINVAL; 295 } 296 dswidth = simple_strtoul(value, &eov, 10); 297 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { 298 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 299 #if !XFS_BIG_INUMS 300 xfs_warn(mp, "%s option not allowed on this system", 301 this_char); 302 return EINVAL; 303 #endif 304 } else if (!strcmp(this_char, MNTOPT_NOUUID)) { 305 mp->m_flags |= XFS_MOUNT_NOUUID; 306 } else if (!strcmp(this_char, MNTOPT_BARRIER)) { 307 mp->m_flags |= XFS_MOUNT_BARRIER; 308 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) { 309 mp->m_flags &= ~XFS_MOUNT_BARRIER; 310 } else if (!strcmp(this_char, MNTOPT_IKEEP)) { 311 mp->m_flags |= XFS_MOUNT_IKEEP; 312 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { 313 mp->m_flags &= ~XFS_MOUNT_IKEEP; 314 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) { 315 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 316 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) { 317 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 318 } else if (!strcmp(this_char, MNTOPT_ATTR2)) { 319 mp->m_flags |= XFS_MOUNT_ATTR2; 320 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) { 321 mp->m_flags &= ~XFS_MOUNT_ATTR2; 322 mp->m_flags |= XFS_MOUNT_NOATTR2; 323 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) { 324 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 325 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) { 326 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 327 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 328 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 329 } else if (!strcmp(this_char, MNTOPT_QUOTA) || 330 !strcmp(this_char, MNTOPT_UQUOTA) || 331 !strcmp(this_char, MNTOPT_USRQUOTA)) { 332 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 333 XFS_UQUOTA_ENFD); 334 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) || 335 !strcmp(this_char, MNTOPT_UQUOTANOENF)) { 336 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 337 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 338 } else if (!strcmp(this_char, MNTOPT_PQUOTA) || 339 !strcmp(this_char, MNTOPT_PRJQUOTA)) { 340 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 341 XFS_OQUOTA_ENFD); 342 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) { 343 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 344 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 345 } else if (!strcmp(this_char, MNTOPT_GQUOTA) || 346 !strcmp(this_char, MNTOPT_GRPQUOTA)) { 347 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 348 XFS_OQUOTA_ENFD); 349 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) { 350 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 351 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 352 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) { 353 xfs_warn(mp, 354 "delaylog is the default now, option is deprecated."); 355 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) { 356 xfs_warn(mp, 357 "nodelaylog support has been removed, option is deprecated."); 358 } else if (!strcmp(this_char, MNTOPT_DISCARD)) { 359 mp->m_flags |= XFS_MOUNT_DISCARD; 360 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) { 361 mp->m_flags &= ~XFS_MOUNT_DISCARD; 362 } else if (!strcmp(this_char, "ihashsize")) { 363 xfs_warn(mp, 364 "ihashsize no longer used, option is deprecated."); 365 } else if (!strcmp(this_char, "osyncisdsync")) { 366 xfs_warn(mp, 367 "osyncisdsync has no effect, option is deprecated."); 368 } else if (!strcmp(this_char, "osyncisosync")) { 369 xfs_warn(mp, 370 "osyncisosync has no effect, option is deprecated."); 371 } else if (!strcmp(this_char, "irixsgid")) { 372 xfs_warn(mp, 373 "irixsgid is now a sysctl(2) variable, option is deprecated."); 374 } else { 375 xfs_warn(mp, "unknown mount option [%s].", this_char); 376 return EINVAL; 377 } 378 } 379 380 /* 381 * no recovery flag requires a read-only mount 382 */ 383 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 384 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 385 xfs_warn(mp, "no-recovery mounts must be read-only."); 386 return EINVAL; 387 } 388 389 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 390 xfs_warn(mp, 391 "sunit and swidth options incompatible with the noalign option"); 392 return EINVAL; 393 } 394 395 #ifndef CONFIG_XFS_QUOTA 396 if (XFS_IS_QUOTA_RUNNING(mp)) { 397 xfs_warn(mp, "quota support not available in this kernel."); 398 return EINVAL; 399 } 400 #endif 401 402 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 403 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) { 404 xfs_warn(mp, "cannot mount with both project and group quota"); 405 return EINVAL; 406 } 407 408 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 409 xfs_warn(mp, "sunit and swidth must be specified together"); 410 return EINVAL; 411 } 412 413 if (dsunit && (dswidth % dsunit != 0)) { 414 xfs_warn(mp, 415 "stripe width (%d) must be a multiple of the stripe unit (%d)", 416 dswidth, dsunit); 417 return EINVAL; 418 } 419 420 done: 421 if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) { 422 /* 423 * At this point the superblock has not been read 424 * in, therefore we do not know the block size. 425 * Before the mount call ends we will convert 426 * these to FSBs. 427 */ 428 if (dsunit) { 429 mp->m_dalign = dsunit; 430 mp->m_flags |= XFS_MOUNT_RETERR; 431 } 432 433 if (dswidth) 434 mp->m_swidth = dswidth; 435 } 436 437 if (mp->m_logbufs != -1 && 438 mp->m_logbufs != 0 && 439 (mp->m_logbufs < XLOG_MIN_ICLOGS || 440 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 441 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 442 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 443 return XFS_ERROR(EINVAL); 444 } 445 if (mp->m_logbsize != -1 && 446 mp->m_logbsize != 0 && 447 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 448 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 449 !is_power_of_2(mp->m_logbsize))) { 450 xfs_warn(mp, 451 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 452 mp->m_logbsize); 453 return XFS_ERROR(EINVAL); 454 } 455 456 if (iosizelog) { 457 if (iosizelog > XFS_MAX_IO_LOG || 458 iosizelog < XFS_MIN_IO_LOG) { 459 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 460 iosizelog, XFS_MIN_IO_LOG, 461 XFS_MAX_IO_LOG); 462 return XFS_ERROR(EINVAL); 463 } 464 465 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 466 mp->m_readio_log = iosizelog; 467 mp->m_writeio_log = iosizelog; 468 } 469 470 return 0; 471 } 472 473 struct proc_xfs_info { 474 int flag; 475 char *str; 476 }; 477 478 STATIC int 479 xfs_showargs( 480 struct xfs_mount *mp, 481 struct seq_file *m) 482 { 483 static struct proc_xfs_info xfs_info_set[] = { 484 /* the few simple ones we can get from the mount struct */ 485 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP }, 486 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, 487 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, 488 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, 489 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, 490 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, 491 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 }, 492 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM }, 493 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID }, 494 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD }, 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 /* Either project or group quotas can be active, not both */ 542 543 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 544 if (mp->m_qflags & XFS_OQUOTA_ENFD) 545 seq_puts(m, "," MNTOPT_PRJQUOTA); 546 else 547 seq_puts(m, "," MNTOPT_PQUOTANOENF); 548 } else if (mp->m_qflags & XFS_GQUOTA_ACCT) { 549 if (mp->m_qflags & XFS_OQUOTA_ENFD) 550 seq_puts(m, "," MNTOPT_GRPQUOTA); 551 else 552 seq_puts(m, "," MNTOPT_GQUOTANOENF); 553 } 554 555 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 556 seq_puts(m, "," MNTOPT_NOQUOTA); 557 558 return 0; 559 } 560 __uint64_t 561 xfs_max_file_offset( 562 unsigned int blockshift) 563 { 564 unsigned int pagefactor = 1; 565 unsigned int bitshift = BITS_PER_LONG - 1; 566 567 /* Figure out maximum filesize, on Linux this can depend on 568 * the filesystem blocksize (on 32 bit platforms). 569 * __block_write_begin does this in an [unsigned] long... 570 * page->index << (PAGE_CACHE_SHIFT - bbits) 571 * So, for page sized blocks (4K on 32 bit platforms), 572 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 573 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 574 * but for smaller blocksizes it is less (bbits = log2 bsize). 575 * Note1: get_block_t takes a long (implicit cast from above) 576 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 577 * can optionally convert the [unsigned] long from above into 578 * an [unsigned] long long. 579 */ 580 581 #if BITS_PER_LONG == 32 582 # if defined(CONFIG_LBDAF) 583 ASSERT(sizeof(sector_t) == 8); 584 pagefactor = PAGE_CACHE_SIZE; 585 bitshift = BITS_PER_LONG; 586 # else 587 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); 588 # endif 589 #endif 590 591 return (((__uint64_t)pagefactor) << bitshift) - 1; 592 } 593 594 STATIC int 595 xfs_blkdev_get( 596 xfs_mount_t *mp, 597 const char *name, 598 struct block_device **bdevp) 599 { 600 int error = 0; 601 602 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 603 mp); 604 if (IS_ERR(*bdevp)) { 605 error = PTR_ERR(*bdevp); 606 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error); 607 } 608 609 return -error; 610 } 611 612 STATIC void 613 xfs_blkdev_put( 614 struct block_device *bdev) 615 { 616 if (bdev) 617 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 618 } 619 620 void 621 xfs_blkdev_issue_flush( 622 xfs_buftarg_t *buftarg) 623 { 624 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 625 } 626 627 STATIC void 628 xfs_close_devices( 629 struct xfs_mount *mp) 630 { 631 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 632 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 633 xfs_free_buftarg(mp, mp->m_logdev_targp); 634 xfs_blkdev_put(logdev); 635 } 636 if (mp->m_rtdev_targp) { 637 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 638 xfs_free_buftarg(mp, mp->m_rtdev_targp); 639 xfs_blkdev_put(rtdev); 640 } 641 xfs_free_buftarg(mp, mp->m_ddev_targp); 642 } 643 644 /* 645 * The file system configurations are: 646 * (1) device (partition) with data and internal log 647 * (2) logical volume with data and log subvolumes. 648 * (3) logical volume with data, log, and realtime subvolumes. 649 * 650 * We only have to handle opening the log and realtime volumes here if 651 * they are present. The data subvolume has already been opened by 652 * get_sb_bdev() and is stored in sb->s_bdev. 653 */ 654 STATIC int 655 xfs_open_devices( 656 struct xfs_mount *mp) 657 { 658 struct block_device *ddev = mp->m_super->s_bdev; 659 struct block_device *logdev = NULL, *rtdev = NULL; 660 int error; 661 662 /* 663 * Open real time and log devices - order is important. 664 */ 665 if (mp->m_logname) { 666 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 667 if (error) 668 goto out; 669 } 670 671 if (mp->m_rtname) { 672 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 673 if (error) 674 goto out_close_logdev; 675 676 if (rtdev == ddev || rtdev == logdev) { 677 xfs_warn(mp, 678 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 679 error = EINVAL; 680 goto out_close_rtdev; 681 } 682 } 683 684 /* 685 * Setup xfs_mount buffer target pointers 686 */ 687 error = ENOMEM; 688 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname); 689 if (!mp->m_ddev_targp) 690 goto out_close_rtdev; 691 692 if (rtdev) { 693 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1, 694 mp->m_fsname); 695 if (!mp->m_rtdev_targp) 696 goto out_free_ddev_targ; 697 } 698 699 if (logdev && logdev != ddev) { 700 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1, 701 mp->m_fsname); 702 if (!mp->m_logdev_targp) 703 goto out_free_rtdev_targ; 704 } else { 705 mp->m_logdev_targp = mp->m_ddev_targp; 706 } 707 708 return 0; 709 710 out_free_rtdev_targ: 711 if (mp->m_rtdev_targp) 712 xfs_free_buftarg(mp, mp->m_rtdev_targp); 713 out_free_ddev_targ: 714 xfs_free_buftarg(mp, mp->m_ddev_targp); 715 out_close_rtdev: 716 if (rtdev) 717 xfs_blkdev_put(rtdev); 718 out_close_logdev: 719 if (logdev && logdev != ddev) 720 xfs_blkdev_put(logdev); 721 out: 722 return error; 723 } 724 725 /* 726 * Setup xfs_mount buffer target pointers based on superblock 727 */ 728 STATIC int 729 xfs_setup_devices( 730 struct xfs_mount *mp) 731 { 732 int error; 733 734 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize, 735 mp->m_sb.sb_sectsize); 736 if (error) 737 return error; 738 739 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 740 unsigned int log_sector_size = BBSIZE; 741 742 if (xfs_sb_version_hassector(&mp->m_sb)) 743 log_sector_size = mp->m_sb.sb_logsectsize; 744 error = xfs_setsize_buftarg(mp->m_logdev_targp, 745 mp->m_sb.sb_blocksize, 746 log_sector_size); 747 if (error) 748 return error; 749 } 750 if (mp->m_rtdev_targp) { 751 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 752 mp->m_sb.sb_blocksize, 753 mp->m_sb.sb_sectsize); 754 if (error) 755 return error; 756 } 757 758 return 0; 759 } 760 761 STATIC int 762 xfs_init_mount_workqueues( 763 struct xfs_mount *mp) 764 { 765 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 766 WQ_MEM_RECLAIM, 0, mp->m_fsname); 767 if (!mp->m_data_workqueue) 768 goto out; 769 770 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 771 WQ_MEM_RECLAIM, 0, mp->m_fsname); 772 if (!mp->m_unwritten_workqueue) 773 goto out_destroy_data_iodone_queue; 774 775 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 776 WQ_MEM_RECLAIM, 0, mp->m_fsname); 777 if (!mp->m_cil_workqueue) 778 goto out_destroy_unwritten; 779 return 0; 780 781 out_destroy_unwritten: 782 destroy_workqueue(mp->m_unwritten_workqueue); 783 out_destroy_data_iodone_queue: 784 destroy_workqueue(mp->m_data_workqueue); 785 out: 786 return -ENOMEM; 787 } 788 789 STATIC void 790 xfs_destroy_mount_workqueues( 791 struct xfs_mount *mp) 792 { 793 destroy_workqueue(mp->m_cil_workqueue); 794 destroy_workqueue(mp->m_data_workqueue); 795 destroy_workqueue(mp->m_unwritten_workqueue); 796 } 797 798 /* Catch misguided souls that try to use this interface on XFS */ 799 STATIC struct inode * 800 xfs_fs_alloc_inode( 801 struct super_block *sb) 802 { 803 BUG(); 804 return NULL; 805 } 806 807 /* 808 * Now that the generic code is guaranteed not to be accessing 809 * the linux inode, we can reclaim the inode. 810 */ 811 STATIC void 812 xfs_fs_destroy_inode( 813 struct inode *inode) 814 { 815 struct xfs_inode *ip = XFS_I(inode); 816 817 trace_xfs_destroy_inode(ip); 818 819 XFS_STATS_INC(vn_reclaim); 820 821 /* bad inode, get out here ASAP */ 822 if (is_bad_inode(inode)) 823 goto out_reclaim; 824 825 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 826 827 /* 828 * We should never get here with one of the reclaim flags already set. 829 */ 830 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 831 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 832 833 /* 834 * We always use background reclaim here because even if the 835 * inode is clean, it still may be under IO and hence we have 836 * to take the flush lock. The background reclaim path handles 837 * this more efficiently than we can here, so simply let background 838 * reclaim tear down all inodes. 839 */ 840 out_reclaim: 841 xfs_inode_set_reclaim_tag(ip); 842 } 843 844 /* 845 * Slab object creation initialisation for the XFS inode. 846 * This covers only the idempotent fields in the XFS inode; 847 * all other fields need to be initialised on allocation 848 * from the slab. This avoids the need to repeatedly initialise 849 * fields in the xfs inode that left in the initialise state 850 * when freeing the inode. 851 */ 852 STATIC void 853 xfs_fs_inode_init_once( 854 void *inode) 855 { 856 struct xfs_inode *ip = inode; 857 858 memset(ip, 0, sizeof(struct xfs_inode)); 859 860 /* vfs inode */ 861 inode_init_once(VFS_I(ip)); 862 863 /* xfs inode */ 864 atomic_set(&ip->i_pincount, 0); 865 spin_lock_init(&ip->i_flags_lock); 866 867 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 868 "xfsino", ip->i_ino); 869 } 870 871 /* 872 * This is called by the VFS when dirtying inode metadata. This can happen 873 * for a few reasons, but we only care about timestamp updates, given that 874 * we handled the rest ourselves. In theory no other calls should happen, 875 * but for example generic_write_end() keeps dirtying the inode after 876 * updating i_size. Thus we check that the flags are exactly I_DIRTY_SYNC, 877 * and skip this call otherwise. 878 * 879 * We'll hopefull get a different method just for updating timestamps soon, 880 * at which point this hack can go away, and maybe we'll also get real 881 * error handling here. 882 */ 883 STATIC void 884 xfs_fs_dirty_inode( 885 struct inode *inode, 886 int flags) 887 { 888 struct xfs_inode *ip = XFS_I(inode); 889 struct xfs_mount *mp = ip->i_mount; 890 struct xfs_trans *tp; 891 int error; 892 893 if (flags != I_DIRTY_SYNC) 894 return; 895 896 trace_xfs_dirty_inode(ip); 897 898 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); 899 error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0); 900 if (error) { 901 xfs_trans_cancel(tp, 0); 902 goto trouble; 903 } 904 xfs_ilock(ip, XFS_ILOCK_EXCL); 905 /* 906 * Grab all the latest timestamps from the Linux inode. 907 */ 908 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec; 909 ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec; 910 ip->i_d.di_ctime.t_sec = (__int32_t)inode->i_ctime.tv_sec; 911 ip->i_d.di_ctime.t_nsec = (__int32_t)inode->i_ctime.tv_nsec; 912 ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec; 913 ip->i_d.di_mtime.t_nsec = (__int32_t)inode->i_mtime.tv_nsec; 914 915 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 916 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP); 917 error = xfs_trans_commit(tp, 0); 918 if (error) 919 goto trouble; 920 return; 921 922 trouble: 923 xfs_warn(mp, "failed to update timestamps for inode 0x%llx", ip->i_ino); 924 } 925 926 STATIC void 927 xfs_fs_evict_inode( 928 struct inode *inode) 929 { 930 xfs_inode_t *ip = XFS_I(inode); 931 932 trace_xfs_evict_inode(ip); 933 934 truncate_inode_pages(&inode->i_data, 0); 935 clear_inode(inode); 936 XFS_STATS_INC(vn_rele); 937 XFS_STATS_INC(vn_remove); 938 XFS_STATS_DEC(vn_active); 939 940 /* 941 * The iolock is used by the file system to coordinate reads, 942 * writes, and block truncates. Up to this point the lock 943 * protected concurrent accesses by users of the inode. But 944 * from here forward we're doing some final processing of the 945 * inode because we're done with it, and although we reuse the 946 * iolock for protection it is really a distinct lock class 947 * (in the lockdep sense) from before. To keep lockdep happy 948 * (and basically indicate what we are doing), we explicitly 949 * re-init the iolock here. 950 */ 951 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 952 mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino); 953 lockdep_set_class_and_name(&ip->i_iolock.mr_lock, 954 &xfs_iolock_reclaimable, "xfs_iolock_reclaimable"); 955 956 xfs_inactive(ip); 957 } 958 959 /* 960 * We do an unlocked check for XFS_IDONTCACHE here because we are already 961 * serialised against cache hits here via the inode->i_lock and igrab() in 962 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 963 * racing with us, and it avoids needing to grab a spinlock here for every inode 964 * we drop the final reference on. 965 */ 966 STATIC int 967 xfs_fs_drop_inode( 968 struct inode *inode) 969 { 970 struct xfs_inode *ip = XFS_I(inode); 971 972 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 973 } 974 975 STATIC void 976 xfs_free_fsname( 977 struct xfs_mount *mp) 978 { 979 kfree(mp->m_fsname); 980 kfree(mp->m_rtname); 981 kfree(mp->m_logname); 982 } 983 984 STATIC void 985 xfs_fs_put_super( 986 struct super_block *sb) 987 { 988 struct xfs_mount *mp = XFS_M(sb); 989 990 xfs_filestream_unmount(mp); 991 xfs_unmountfs(mp); 992 xfs_syncd_stop(mp); 993 xfs_freesb(mp); 994 xfs_icsb_destroy_counters(mp); 995 xfs_destroy_mount_workqueues(mp); 996 xfs_close_devices(mp); 997 xfs_free_fsname(mp); 998 kfree(mp); 999 } 1000 1001 STATIC int 1002 xfs_fs_sync_fs( 1003 struct super_block *sb, 1004 int wait) 1005 { 1006 struct xfs_mount *mp = XFS_M(sb); 1007 int error; 1008 1009 /* 1010 * Doing anything during the async pass would be counterproductive. 1011 */ 1012 if (!wait) 1013 return 0; 1014 1015 error = xfs_quiesce_data(mp); 1016 if (error) 1017 return -error; 1018 1019 if (laptop_mode) { 1020 /* 1021 * The disk must be active because we're syncing. 1022 * We schedule xfssyncd now (now that the disk is 1023 * active) instead of later (when it might not be). 1024 */ 1025 flush_delayed_work_sync(&mp->m_sync_work); 1026 } 1027 1028 return 0; 1029 } 1030 1031 STATIC int 1032 xfs_fs_statfs( 1033 struct dentry *dentry, 1034 struct kstatfs *statp) 1035 { 1036 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1037 xfs_sb_t *sbp = &mp->m_sb; 1038 struct xfs_inode *ip = XFS_I(dentry->d_inode); 1039 __uint64_t fakeinos, id; 1040 xfs_extlen_t lsize; 1041 __int64_t ffree; 1042 1043 statp->f_type = XFS_SB_MAGIC; 1044 statp->f_namelen = MAXNAMELEN - 1; 1045 1046 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1047 statp->f_fsid.val[0] = (u32)id; 1048 statp->f_fsid.val[1] = (u32)(id >> 32); 1049 1050 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 1051 1052 spin_lock(&mp->m_sb_lock); 1053 statp->f_bsize = sbp->sb_blocksize; 1054 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1055 statp->f_blocks = sbp->sb_dblocks - lsize; 1056 statp->f_bfree = statp->f_bavail = 1057 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 1058 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1059 statp->f_files = 1060 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1061 if (mp->m_maxicount) 1062 statp->f_files = min_t(typeof(statp->f_files), 1063 statp->f_files, 1064 mp->m_maxicount); 1065 1066 /* make sure statp->f_ffree does not underflow */ 1067 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree); 1068 statp->f_ffree = max_t(__int64_t, ffree, 0); 1069 1070 spin_unlock(&mp->m_sb_lock); 1071 1072 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1073 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) == 1074 (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD)) 1075 xfs_qm_statvfs(ip, statp); 1076 return 0; 1077 } 1078 1079 STATIC void 1080 xfs_save_resvblks(struct xfs_mount *mp) 1081 { 1082 __uint64_t resblks = 0; 1083 1084 mp->m_resblks_save = mp->m_resblks; 1085 xfs_reserve_blocks(mp, &resblks, NULL); 1086 } 1087 1088 STATIC void 1089 xfs_restore_resvblks(struct xfs_mount *mp) 1090 { 1091 __uint64_t resblks; 1092 1093 if (mp->m_resblks_save) { 1094 resblks = mp->m_resblks_save; 1095 mp->m_resblks_save = 0; 1096 } else 1097 resblks = xfs_default_resblks(mp); 1098 1099 xfs_reserve_blocks(mp, &resblks, NULL); 1100 } 1101 1102 STATIC int 1103 xfs_fs_remount( 1104 struct super_block *sb, 1105 int *flags, 1106 char *options) 1107 { 1108 struct xfs_mount *mp = XFS_M(sb); 1109 substring_t args[MAX_OPT_ARGS]; 1110 char *p; 1111 int error; 1112 1113 while ((p = strsep(&options, ",")) != NULL) { 1114 int token; 1115 1116 if (!*p) 1117 continue; 1118 1119 token = match_token(p, tokens, args); 1120 switch (token) { 1121 case Opt_barrier: 1122 mp->m_flags |= XFS_MOUNT_BARRIER; 1123 break; 1124 case Opt_nobarrier: 1125 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1126 break; 1127 default: 1128 /* 1129 * Logically we would return an error here to prevent 1130 * users from believing they might have changed 1131 * mount options using remount which can't be changed. 1132 * 1133 * But unfortunately mount(8) adds all options from 1134 * mtab and fstab to the mount arguments in some cases 1135 * so we can't blindly reject options, but have to 1136 * check for each specified option if it actually 1137 * differs from the currently set option and only 1138 * reject it if that's the case. 1139 * 1140 * Until that is implemented we return success for 1141 * every remount request, and silently ignore all 1142 * options that we can't actually change. 1143 */ 1144 #if 0 1145 xfs_info(mp, 1146 "mount option \"%s\" not supported for remount\n", p); 1147 return -EINVAL; 1148 #else 1149 break; 1150 #endif 1151 } 1152 } 1153 1154 /* ro -> rw */ 1155 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1156 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1157 1158 /* 1159 * If this is the first remount to writeable state we 1160 * might have some superblock changes to update. 1161 */ 1162 if (mp->m_update_flags) { 1163 error = xfs_mount_log_sb(mp, mp->m_update_flags); 1164 if (error) { 1165 xfs_warn(mp, "failed to write sb changes"); 1166 return error; 1167 } 1168 mp->m_update_flags = 0; 1169 } 1170 1171 /* 1172 * Fill out the reserve pool if it is empty. Use the stashed 1173 * value if it is non-zero, otherwise go with the default. 1174 */ 1175 xfs_restore_resvblks(mp); 1176 } 1177 1178 /* rw -> ro */ 1179 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1180 /* 1181 * After we have synced the data but before we sync the 1182 * metadata, we need to free up the reserve block pool so that 1183 * the used block count in the superblock on disk is correct at 1184 * the end of the remount. Stash the current reserve pool size 1185 * so that if we get remounted rw, we can return it to the same 1186 * size. 1187 */ 1188 1189 xfs_quiesce_data(mp); 1190 xfs_save_resvblks(mp); 1191 xfs_quiesce_attr(mp); 1192 mp->m_flags |= XFS_MOUNT_RDONLY; 1193 } 1194 1195 return 0; 1196 } 1197 1198 /* 1199 * Second stage of a freeze. The data is already frozen so we only 1200 * need to take care of the metadata. Once that's done write a dummy 1201 * record to dirty the log in case of a crash while frozen. 1202 */ 1203 STATIC int 1204 xfs_fs_freeze( 1205 struct super_block *sb) 1206 { 1207 struct xfs_mount *mp = XFS_M(sb); 1208 1209 xfs_save_resvblks(mp); 1210 xfs_quiesce_attr(mp); 1211 return -xfs_fs_log_dummy(mp); 1212 } 1213 1214 STATIC int 1215 xfs_fs_unfreeze( 1216 struct super_block *sb) 1217 { 1218 struct xfs_mount *mp = XFS_M(sb); 1219 1220 xfs_restore_resvblks(mp); 1221 return 0; 1222 } 1223 1224 STATIC int 1225 xfs_fs_show_options( 1226 struct seq_file *m, 1227 struct dentry *root) 1228 { 1229 return -xfs_showargs(XFS_M(root->d_sb), m); 1230 } 1231 1232 /* 1233 * This function fills in xfs_mount_t fields based on mount args. 1234 * Note: the superblock _has_ now been read in. 1235 */ 1236 STATIC int 1237 xfs_finish_flags( 1238 struct xfs_mount *mp) 1239 { 1240 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1241 1242 /* Fail a mount where the logbuf is smaller than the log stripe */ 1243 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1244 if (mp->m_logbsize <= 0 && 1245 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1246 mp->m_logbsize = mp->m_sb.sb_logsunit; 1247 } else if (mp->m_logbsize > 0 && 1248 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1249 xfs_warn(mp, 1250 "logbuf size must be greater than or equal to log stripe size"); 1251 return XFS_ERROR(EINVAL); 1252 } 1253 } else { 1254 /* Fail a mount if the logbuf is larger than 32K */ 1255 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1256 xfs_warn(mp, 1257 "logbuf size for version 1 logs must be 16K or 32K"); 1258 return XFS_ERROR(EINVAL); 1259 } 1260 } 1261 1262 /* 1263 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1264 * told by noattr2 to turn it off 1265 */ 1266 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1267 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1268 mp->m_flags |= XFS_MOUNT_ATTR2; 1269 1270 /* 1271 * prohibit r/w mounts of read-only filesystems 1272 */ 1273 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1274 xfs_warn(mp, 1275 "cannot mount a read-only filesystem as read-write"); 1276 return XFS_ERROR(EROFS); 1277 } 1278 1279 return 0; 1280 } 1281 1282 STATIC int 1283 xfs_fs_fill_super( 1284 struct super_block *sb, 1285 void *data, 1286 int silent) 1287 { 1288 struct inode *root; 1289 struct xfs_mount *mp = NULL; 1290 int flags = 0, error = ENOMEM; 1291 1292 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1293 if (!mp) 1294 goto out; 1295 1296 spin_lock_init(&mp->m_sb_lock); 1297 mutex_init(&mp->m_growlock); 1298 atomic_set(&mp->m_active_trans, 0); 1299 1300 mp->m_super = sb; 1301 sb->s_fs_info = mp; 1302 1303 error = xfs_parseargs(mp, (char *)data); 1304 if (error) 1305 goto out_free_fsname; 1306 1307 sb_min_blocksize(sb, BBSIZE); 1308 sb->s_xattr = xfs_xattr_handlers; 1309 sb->s_export_op = &xfs_export_operations; 1310 #ifdef CONFIG_XFS_QUOTA 1311 sb->s_qcop = &xfs_quotactl_operations; 1312 #endif 1313 sb->s_op = &xfs_super_operations; 1314 1315 if (silent) 1316 flags |= XFS_MFSI_QUIET; 1317 1318 error = xfs_open_devices(mp); 1319 if (error) 1320 goto out_free_fsname; 1321 1322 error = xfs_init_mount_workqueues(mp); 1323 if (error) 1324 goto out_close_devices; 1325 1326 error = xfs_icsb_init_counters(mp); 1327 if (error) 1328 goto out_destroy_workqueues; 1329 1330 error = xfs_readsb(mp, flags); 1331 if (error) 1332 goto out_destroy_counters; 1333 1334 error = xfs_finish_flags(mp); 1335 if (error) 1336 goto out_free_sb; 1337 1338 error = xfs_setup_devices(mp); 1339 if (error) 1340 goto out_free_sb; 1341 1342 error = xfs_filestream_mount(mp); 1343 if (error) 1344 goto out_free_sb; 1345 1346 /* 1347 * we must configure the block size in the superblock before we run the 1348 * full mount process as the mount process can lookup and cache inodes. 1349 * For the same reason we must also initialise the syncd and register 1350 * the inode cache shrinker so that inodes can be reclaimed during 1351 * operations like a quotacheck that iterate all inodes in the 1352 * filesystem. 1353 */ 1354 sb->s_magic = XFS_SB_MAGIC; 1355 sb->s_blocksize = mp->m_sb.sb_blocksize; 1356 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1357 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1358 sb->s_max_links = XFS_MAXLINK; 1359 sb->s_time_gran = 1; 1360 set_posix_acl_flag(sb); 1361 1362 error = xfs_syncd_init(mp); 1363 if (error) 1364 goto out_filestream_unmount; 1365 1366 error = xfs_mountfs(mp); 1367 if (error) 1368 goto out_syncd_stop; 1369 1370 root = igrab(VFS_I(mp->m_rootip)); 1371 if (!root) { 1372 error = ENOENT; 1373 goto out_unmount; 1374 } 1375 if (is_bad_inode(root)) { 1376 error = EINVAL; 1377 goto out_unmount; 1378 } 1379 sb->s_root = d_make_root(root); 1380 if (!sb->s_root) { 1381 error = ENOMEM; 1382 goto out_unmount; 1383 } 1384 1385 return 0; 1386 out_syncd_stop: 1387 xfs_syncd_stop(mp); 1388 out_filestream_unmount: 1389 xfs_filestream_unmount(mp); 1390 out_free_sb: 1391 xfs_freesb(mp); 1392 out_destroy_counters: 1393 xfs_icsb_destroy_counters(mp); 1394 out_destroy_workqueues: 1395 xfs_destroy_mount_workqueues(mp); 1396 out_close_devices: 1397 xfs_close_devices(mp); 1398 out_free_fsname: 1399 xfs_free_fsname(mp); 1400 kfree(mp); 1401 out: 1402 return -error; 1403 1404 out_unmount: 1405 xfs_filestream_unmount(mp); 1406 xfs_unmountfs(mp); 1407 xfs_syncd_stop(mp); 1408 goto out_free_sb; 1409 } 1410 1411 STATIC struct dentry * 1412 xfs_fs_mount( 1413 struct file_system_type *fs_type, 1414 int flags, 1415 const char *dev_name, 1416 void *data) 1417 { 1418 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1419 } 1420 1421 static int 1422 xfs_fs_nr_cached_objects( 1423 struct super_block *sb) 1424 { 1425 return xfs_reclaim_inodes_count(XFS_M(sb)); 1426 } 1427 1428 static void 1429 xfs_fs_free_cached_objects( 1430 struct super_block *sb, 1431 int nr_to_scan) 1432 { 1433 xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan); 1434 } 1435 1436 static const struct super_operations xfs_super_operations = { 1437 .alloc_inode = xfs_fs_alloc_inode, 1438 .destroy_inode = xfs_fs_destroy_inode, 1439 .dirty_inode = xfs_fs_dirty_inode, 1440 .evict_inode = xfs_fs_evict_inode, 1441 .drop_inode = xfs_fs_drop_inode, 1442 .put_super = xfs_fs_put_super, 1443 .sync_fs = xfs_fs_sync_fs, 1444 .freeze_fs = xfs_fs_freeze, 1445 .unfreeze_fs = xfs_fs_unfreeze, 1446 .statfs = xfs_fs_statfs, 1447 .remount_fs = xfs_fs_remount, 1448 .show_options = xfs_fs_show_options, 1449 .nr_cached_objects = xfs_fs_nr_cached_objects, 1450 .free_cached_objects = xfs_fs_free_cached_objects, 1451 }; 1452 1453 static struct file_system_type xfs_fs_type = { 1454 .owner = THIS_MODULE, 1455 .name = "xfs", 1456 .mount = xfs_fs_mount, 1457 .kill_sb = kill_block_super, 1458 .fs_flags = FS_REQUIRES_DEV, 1459 }; 1460 1461 STATIC int __init 1462 xfs_init_zones(void) 1463 { 1464 1465 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend"); 1466 if (!xfs_ioend_zone) 1467 goto out; 1468 1469 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE, 1470 xfs_ioend_zone); 1471 if (!xfs_ioend_pool) 1472 goto out_destroy_ioend_zone; 1473 1474 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1475 "xfs_log_ticket"); 1476 if (!xfs_log_ticket_zone) 1477 goto out_destroy_ioend_pool; 1478 1479 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), 1480 "xfs_bmap_free_item"); 1481 if (!xfs_bmap_free_item_zone) 1482 goto out_destroy_log_ticket_zone; 1483 1484 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1485 "xfs_btree_cur"); 1486 if (!xfs_btree_cur_zone) 1487 goto out_destroy_bmap_free_item_zone; 1488 1489 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1490 "xfs_da_state"); 1491 if (!xfs_da_state_zone) 1492 goto out_destroy_btree_cur_zone; 1493 1494 xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf"); 1495 if (!xfs_dabuf_zone) 1496 goto out_destroy_da_state_zone; 1497 1498 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1499 if (!xfs_ifork_zone) 1500 goto out_destroy_dabuf_zone; 1501 1502 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1503 if (!xfs_trans_zone) 1504 goto out_destroy_ifork_zone; 1505 1506 xfs_log_item_desc_zone = 1507 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1508 "xfs_log_item_desc"); 1509 if (!xfs_log_item_desc_zone) 1510 goto out_destroy_trans_zone; 1511 1512 /* 1513 * The size of the zone allocated buf log item is the maximum 1514 * size possible under XFS. This wastes a little bit of memory, 1515 * but it is much faster. 1516 */ 1517 xfs_buf_item_zone = kmem_zone_init((sizeof(xfs_buf_log_item_t) + 1518 (((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / 1519 NBWORD) * sizeof(int))), "xfs_buf_item"); 1520 if (!xfs_buf_item_zone) 1521 goto out_destroy_log_item_desc_zone; 1522 1523 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1524 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1525 sizeof(xfs_extent_t))), "xfs_efd_item"); 1526 if (!xfs_efd_zone) 1527 goto out_destroy_buf_item_zone; 1528 1529 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1530 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1531 sizeof(xfs_extent_t))), "xfs_efi_item"); 1532 if (!xfs_efi_zone) 1533 goto out_destroy_efd_zone; 1534 1535 xfs_inode_zone = 1536 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1537 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD, 1538 xfs_fs_inode_init_once); 1539 if (!xfs_inode_zone) 1540 goto out_destroy_efi_zone; 1541 1542 xfs_ili_zone = 1543 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1544 KM_ZONE_SPREAD, NULL); 1545 if (!xfs_ili_zone) 1546 goto out_destroy_inode_zone; 1547 1548 return 0; 1549 1550 out_destroy_inode_zone: 1551 kmem_zone_destroy(xfs_inode_zone); 1552 out_destroy_efi_zone: 1553 kmem_zone_destroy(xfs_efi_zone); 1554 out_destroy_efd_zone: 1555 kmem_zone_destroy(xfs_efd_zone); 1556 out_destroy_buf_item_zone: 1557 kmem_zone_destroy(xfs_buf_item_zone); 1558 out_destroy_log_item_desc_zone: 1559 kmem_zone_destroy(xfs_log_item_desc_zone); 1560 out_destroy_trans_zone: 1561 kmem_zone_destroy(xfs_trans_zone); 1562 out_destroy_ifork_zone: 1563 kmem_zone_destroy(xfs_ifork_zone); 1564 out_destroy_dabuf_zone: 1565 kmem_zone_destroy(xfs_dabuf_zone); 1566 out_destroy_da_state_zone: 1567 kmem_zone_destroy(xfs_da_state_zone); 1568 out_destroy_btree_cur_zone: 1569 kmem_zone_destroy(xfs_btree_cur_zone); 1570 out_destroy_bmap_free_item_zone: 1571 kmem_zone_destroy(xfs_bmap_free_item_zone); 1572 out_destroy_log_ticket_zone: 1573 kmem_zone_destroy(xfs_log_ticket_zone); 1574 out_destroy_ioend_pool: 1575 mempool_destroy(xfs_ioend_pool); 1576 out_destroy_ioend_zone: 1577 kmem_zone_destroy(xfs_ioend_zone); 1578 out: 1579 return -ENOMEM; 1580 } 1581 1582 STATIC void 1583 xfs_destroy_zones(void) 1584 { 1585 kmem_zone_destroy(xfs_ili_zone); 1586 kmem_zone_destroy(xfs_inode_zone); 1587 kmem_zone_destroy(xfs_efi_zone); 1588 kmem_zone_destroy(xfs_efd_zone); 1589 kmem_zone_destroy(xfs_buf_item_zone); 1590 kmem_zone_destroy(xfs_log_item_desc_zone); 1591 kmem_zone_destroy(xfs_trans_zone); 1592 kmem_zone_destroy(xfs_ifork_zone); 1593 kmem_zone_destroy(xfs_dabuf_zone); 1594 kmem_zone_destroy(xfs_da_state_zone); 1595 kmem_zone_destroy(xfs_btree_cur_zone); 1596 kmem_zone_destroy(xfs_bmap_free_item_zone); 1597 kmem_zone_destroy(xfs_log_ticket_zone); 1598 mempool_destroy(xfs_ioend_pool); 1599 kmem_zone_destroy(xfs_ioend_zone); 1600 1601 } 1602 1603 STATIC int __init 1604 xfs_init_workqueues(void) 1605 { 1606 /* 1607 * We never want to the same work item to run twice, reclaiming inodes 1608 * or idling the log is not going to get any faster by multiple CPUs 1609 * competing for ressources. Use the default large max_active value 1610 * so that even lots of filesystems can perform these task in parallel. 1611 */ 1612 xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0); 1613 if (!xfs_syncd_wq) 1614 return -ENOMEM; 1615 1616 /* 1617 * The allocation workqueue can be used in memory reclaim situations 1618 * (writepage path), and parallelism is only limited by the number of 1619 * AGs in all the filesystems mounted. Hence use the default large 1620 * max_active value for this workqueue. 1621 */ 1622 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0); 1623 if (!xfs_alloc_wq) 1624 goto out_destroy_syncd; 1625 1626 return 0; 1627 1628 out_destroy_syncd: 1629 destroy_workqueue(xfs_syncd_wq); 1630 return -ENOMEM; 1631 } 1632 1633 STATIC void 1634 xfs_destroy_workqueues(void) 1635 { 1636 destroy_workqueue(xfs_alloc_wq); 1637 destroy_workqueue(xfs_syncd_wq); 1638 } 1639 1640 STATIC int __init 1641 init_xfs_fs(void) 1642 { 1643 int error; 1644 1645 printk(KERN_INFO XFS_VERSION_STRING " with " 1646 XFS_BUILD_OPTIONS " enabled\n"); 1647 1648 xfs_dir_startup(); 1649 1650 error = xfs_init_zones(); 1651 if (error) 1652 goto out; 1653 1654 error = xfs_init_workqueues(); 1655 if (error) 1656 goto out_destroy_zones; 1657 1658 error = xfs_mru_cache_init(); 1659 if (error) 1660 goto out_destroy_wq; 1661 1662 error = xfs_filestream_init(); 1663 if (error) 1664 goto out_mru_cache_uninit; 1665 1666 error = xfs_buf_init(); 1667 if (error) 1668 goto out_filestream_uninit; 1669 1670 error = xfs_init_procfs(); 1671 if (error) 1672 goto out_buf_terminate; 1673 1674 error = xfs_sysctl_register(); 1675 if (error) 1676 goto out_cleanup_procfs; 1677 1678 error = xfs_qm_init(); 1679 if (error) 1680 goto out_sysctl_unregister; 1681 1682 error = register_filesystem(&xfs_fs_type); 1683 if (error) 1684 goto out_qm_exit; 1685 return 0; 1686 1687 out_qm_exit: 1688 xfs_qm_exit(); 1689 out_sysctl_unregister: 1690 xfs_sysctl_unregister(); 1691 out_cleanup_procfs: 1692 xfs_cleanup_procfs(); 1693 out_buf_terminate: 1694 xfs_buf_terminate(); 1695 out_filestream_uninit: 1696 xfs_filestream_uninit(); 1697 out_mru_cache_uninit: 1698 xfs_mru_cache_uninit(); 1699 out_destroy_wq: 1700 xfs_destroy_workqueues(); 1701 out_destroy_zones: 1702 xfs_destroy_zones(); 1703 out: 1704 return error; 1705 } 1706 1707 STATIC void __exit 1708 exit_xfs_fs(void) 1709 { 1710 xfs_qm_exit(); 1711 unregister_filesystem(&xfs_fs_type); 1712 xfs_sysctl_unregister(); 1713 xfs_cleanup_procfs(); 1714 xfs_buf_terminate(); 1715 xfs_filestream_uninit(); 1716 xfs_mru_cache_uninit(); 1717 xfs_destroy_workqueues(); 1718 xfs_destroy_zones(); 1719 } 1720 1721 module_init(init_xfs_fs); 1722 module_exit(exit_xfs_fs); 1723 1724 MODULE_AUTHOR("Silicon Graphics, Inc."); 1725 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1726 MODULE_LICENSE("GPL"); 1727