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_32BITINODE "inode32" /* inode allocation limited to 92 * XFS_MAXINUMBER_32 */ 93 #define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */ 94 #define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ 95 #define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */ 96 #define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes 97 * in stat(). */ 98 #define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */ 99 #define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */ 100 #define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */ 101 #define MNTOPT_QUOTA "quota" /* disk quotas (user) */ 102 #define MNTOPT_NOQUOTA "noquota" /* no quotas */ 103 #define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */ 104 #define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */ 105 #define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */ 106 #define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */ 107 #define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */ 108 #define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */ 109 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */ 110 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */ 111 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */ 112 #define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */ 113 #define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */ 114 #define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */ 115 #define MNTOPT_DISCARD "discard" /* Discard unused blocks */ 116 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */ 117 118 /* 119 * Table driven mount option parser. 120 * 121 * Currently only used for remount, but it will be used for mount 122 * in the future, too. 123 */ 124 enum { 125 Opt_barrier, 126 Opt_nobarrier, 127 Opt_inode64, 128 Opt_inode32, 129 Opt_err 130 }; 131 132 static const match_table_t tokens = { 133 {Opt_barrier, "barrier"}, 134 {Opt_nobarrier, "nobarrier"}, 135 {Opt_inode64, "inode64"}, 136 {Opt_inode32, "inode32"}, 137 {Opt_err, NULL} 138 }; 139 140 141 STATIC unsigned long 142 suffix_strtoul(char *s, char **endp, unsigned int base) 143 { 144 int last, shift_left_factor = 0; 145 char *value = s; 146 147 last = strlen(value) - 1; 148 if (value[last] == 'K' || value[last] == 'k') { 149 shift_left_factor = 10; 150 value[last] = '\0'; 151 } 152 if (value[last] == 'M' || value[last] == 'm') { 153 shift_left_factor = 20; 154 value[last] = '\0'; 155 } 156 if (value[last] == 'G' || value[last] == 'g') { 157 shift_left_factor = 30; 158 value[last] = '\0'; 159 } 160 161 return simple_strtoul((const char *)s, endp, base) << shift_left_factor; 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, *eov; 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 #if !XFS_BIG_INUMS 209 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 210 #endif 211 212 /* 213 * These can be overridden by the mount option parsing. 214 */ 215 mp->m_logbufs = -1; 216 mp->m_logbsize = -1; 217 218 if (!options) 219 goto done; 220 221 while ((this_char = strsep(&options, ",")) != NULL) { 222 if (!*this_char) 223 continue; 224 if ((value = strchr(this_char, '=')) != NULL) 225 *value++ = 0; 226 227 if (!strcmp(this_char, MNTOPT_LOGBUFS)) { 228 if (!value || !*value) { 229 xfs_warn(mp, "%s option requires an argument", 230 this_char); 231 return EINVAL; 232 } 233 mp->m_logbufs = simple_strtoul(value, &eov, 10); 234 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) { 235 if (!value || !*value) { 236 xfs_warn(mp, "%s option requires an argument", 237 this_char); 238 return EINVAL; 239 } 240 mp->m_logbsize = suffix_strtoul(value, &eov, 10); 241 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { 242 if (!value || !*value) { 243 xfs_warn(mp, "%s option requires an argument", 244 this_char); 245 return EINVAL; 246 } 247 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 248 if (!mp->m_logname) 249 return ENOMEM; 250 } else if (!strcmp(this_char, MNTOPT_MTPT)) { 251 xfs_warn(mp, "%s option not allowed on this system", 252 this_char); 253 return EINVAL; 254 } else if (!strcmp(this_char, MNTOPT_RTDEV)) { 255 if (!value || !*value) { 256 xfs_warn(mp, "%s option requires an argument", 257 this_char); 258 return EINVAL; 259 } 260 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 261 if (!mp->m_rtname) 262 return ENOMEM; 263 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) { 264 if (!value || !*value) { 265 xfs_warn(mp, "%s option requires an argument", 266 this_char); 267 return EINVAL; 268 } 269 iosize = simple_strtoul(value, &eov, 10); 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 iosize = suffix_strtoul(value, &eov, 10); 278 iosizelog = ffs(iosize) - 1; 279 } else if (!strcmp(this_char, MNTOPT_GRPID) || 280 !strcmp(this_char, MNTOPT_BSDGROUPS)) { 281 mp->m_flags |= XFS_MOUNT_GRPID; 282 } else if (!strcmp(this_char, MNTOPT_NOGRPID) || 283 !strcmp(this_char, MNTOPT_SYSVGROUPS)) { 284 mp->m_flags &= ~XFS_MOUNT_GRPID; 285 } else if (!strcmp(this_char, MNTOPT_WSYNC)) { 286 mp->m_flags |= XFS_MOUNT_WSYNC; 287 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { 288 mp->m_flags |= XFS_MOUNT_NORECOVERY; 289 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { 290 mp->m_flags |= XFS_MOUNT_NOALIGN; 291 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { 292 mp->m_flags |= XFS_MOUNT_SWALLOC; 293 } else if (!strcmp(this_char, MNTOPT_SUNIT)) { 294 if (!value || !*value) { 295 xfs_warn(mp, "%s option requires an argument", 296 this_char); 297 return EINVAL; 298 } 299 dsunit = simple_strtoul(value, &eov, 10); 300 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { 301 if (!value || !*value) { 302 xfs_warn(mp, "%s option requires an argument", 303 this_char); 304 return EINVAL; 305 } 306 dswidth = simple_strtoul(value, &eov, 10); 307 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) { 308 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 309 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { 310 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 311 #if !XFS_BIG_INUMS 312 xfs_warn(mp, "%s option not allowed on this system", 313 this_char); 314 return EINVAL; 315 #endif 316 } else if (!strcmp(this_char, MNTOPT_NOUUID)) { 317 mp->m_flags |= XFS_MOUNT_NOUUID; 318 } else if (!strcmp(this_char, MNTOPT_BARRIER)) { 319 mp->m_flags |= XFS_MOUNT_BARRIER; 320 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) { 321 mp->m_flags &= ~XFS_MOUNT_BARRIER; 322 } else if (!strcmp(this_char, MNTOPT_IKEEP)) { 323 mp->m_flags |= XFS_MOUNT_IKEEP; 324 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { 325 mp->m_flags &= ~XFS_MOUNT_IKEEP; 326 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) { 327 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 328 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) { 329 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 330 } else if (!strcmp(this_char, MNTOPT_ATTR2)) { 331 mp->m_flags |= XFS_MOUNT_ATTR2; 332 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) { 333 mp->m_flags &= ~XFS_MOUNT_ATTR2; 334 mp->m_flags |= XFS_MOUNT_NOATTR2; 335 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) { 336 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 337 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) { 338 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 339 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 340 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 341 } else if (!strcmp(this_char, MNTOPT_QUOTA) || 342 !strcmp(this_char, MNTOPT_UQUOTA) || 343 !strcmp(this_char, MNTOPT_USRQUOTA)) { 344 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 345 XFS_UQUOTA_ENFD); 346 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) || 347 !strcmp(this_char, MNTOPT_UQUOTANOENF)) { 348 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 349 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 350 } else if (!strcmp(this_char, MNTOPT_PQUOTA) || 351 !strcmp(this_char, MNTOPT_PRJQUOTA)) { 352 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 353 XFS_OQUOTA_ENFD); 354 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) { 355 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 356 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 357 } else if (!strcmp(this_char, MNTOPT_GQUOTA) || 358 !strcmp(this_char, MNTOPT_GRPQUOTA)) { 359 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 360 XFS_OQUOTA_ENFD); 361 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) { 362 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 363 mp->m_qflags &= ~XFS_OQUOTA_ENFD; 364 } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) { 365 xfs_warn(mp, 366 "delaylog is the default now, option is deprecated."); 367 } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) { 368 xfs_warn(mp, 369 "nodelaylog support has been removed, option is deprecated."); 370 } else if (!strcmp(this_char, MNTOPT_DISCARD)) { 371 mp->m_flags |= XFS_MOUNT_DISCARD; 372 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) { 373 mp->m_flags &= ~XFS_MOUNT_DISCARD; 374 } else if (!strcmp(this_char, "ihashsize")) { 375 xfs_warn(mp, 376 "ihashsize no longer used, option is deprecated."); 377 } else if (!strcmp(this_char, "osyncisdsync")) { 378 xfs_warn(mp, 379 "osyncisdsync has no effect, option is deprecated."); 380 } else if (!strcmp(this_char, "osyncisosync")) { 381 xfs_warn(mp, 382 "osyncisosync has no effect, option is deprecated."); 383 } else if (!strcmp(this_char, "irixsgid")) { 384 xfs_warn(mp, 385 "irixsgid is now a sysctl(2) variable, option is deprecated."); 386 } else { 387 xfs_warn(mp, "unknown mount option [%s].", this_char); 388 return EINVAL; 389 } 390 } 391 392 /* 393 * no recovery flag requires a read-only mount 394 */ 395 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 396 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 397 xfs_warn(mp, "no-recovery mounts must be read-only."); 398 return EINVAL; 399 } 400 401 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 402 xfs_warn(mp, 403 "sunit and swidth options incompatible with the noalign option"); 404 return EINVAL; 405 } 406 407 #ifndef CONFIG_XFS_QUOTA 408 if (XFS_IS_QUOTA_RUNNING(mp)) { 409 xfs_warn(mp, "quota support not available in this kernel."); 410 return EINVAL; 411 } 412 #endif 413 414 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 415 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) { 416 xfs_warn(mp, "cannot mount with both project and group quota"); 417 return EINVAL; 418 } 419 420 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 421 xfs_warn(mp, "sunit and swidth must be specified together"); 422 return EINVAL; 423 } 424 425 if (dsunit && (dswidth % dsunit != 0)) { 426 xfs_warn(mp, 427 "stripe width (%d) must be a multiple of the stripe unit (%d)", 428 dswidth, dsunit); 429 return EINVAL; 430 } 431 432 done: 433 if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) { 434 /* 435 * At this point the superblock has not been read 436 * in, therefore we do not know the block size. 437 * Before the mount call ends we will convert 438 * these to FSBs. 439 */ 440 if (dsunit) { 441 mp->m_dalign = dsunit; 442 mp->m_flags |= XFS_MOUNT_RETERR; 443 } 444 445 if (dswidth) 446 mp->m_swidth = dswidth; 447 } 448 449 if (mp->m_logbufs != -1 && 450 mp->m_logbufs != 0 && 451 (mp->m_logbufs < XLOG_MIN_ICLOGS || 452 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 453 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 454 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 455 return XFS_ERROR(EINVAL); 456 } 457 if (mp->m_logbsize != -1 && 458 mp->m_logbsize != 0 && 459 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 460 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 461 !is_power_of_2(mp->m_logbsize))) { 462 xfs_warn(mp, 463 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 464 mp->m_logbsize); 465 return XFS_ERROR(EINVAL); 466 } 467 468 if (iosizelog) { 469 if (iosizelog > XFS_MAX_IO_LOG || 470 iosizelog < XFS_MIN_IO_LOG) { 471 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 472 iosizelog, XFS_MIN_IO_LOG, 473 XFS_MAX_IO_LOG); 474 return XFS_ERROR(EINVAL); 475 } 476 477 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 478 mp->m_readio_log = iosizelog; 479 mp->m_writeio_log = iosizelog; 480 } 481 482 return 0; 483 } 484 485 struct proc_xfs_info { 486 int flag; 487 char *str; 488 }; 489 490 STATIC int 491 xfs_showargs( 492 struct xfs_mount *mp, 493 struct seq_file *m) 494 { 495 static struct proc_xfs_info xfs_info_set[] = { 496 /* the few simple ones we can get from the mount struct */ 497 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP }, 498 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, 499 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, 500 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, 501 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, 502 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, 503 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 }, 504 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM }, 505 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID }, 506 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD }, 507 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE }, 508 { 0, NULL } 509 }; 510 static struct proc_xfs_info xfs_info_unset[] = { 511 /* the few simple ones we can get from the mount struct */ 512 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO }, 513 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER }, 514 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE }, 515 { 0, NULL } 516 }; 517 struct proc_xfs_info *xfs_infop; 518 519 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { 520 if (mp->m_flags & xfs_infop->flag) 521 seq_puts(m, xfs_infop->str); 522 } 523 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) { 524 if (!(mp->m_flags & xfs_infop->flag)) 525 seq_puts(m, xfs_infop->str); 526 } 527 528 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) 529 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk", 530 (int)(1 << mp->m_writeio_log) >> 10); 531 532 if (mp->m_logbufs > 0) 533 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs); 534 if (mp->m_logbsize > 0) 535 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10); 536 537 if (mp->m_logname) 538 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname); 539 if (mp->m_rtname) 540 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname); 541 542 if (mp->m_dalign > 0) 543 seq_printf(m, "," MNTOPT_SUNIT "=%d", 544 (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); 545 if (mp->m_swidth > 0) 546 seq_printf(m, "," MNTOPT_SWIDTH "=%d", 547 (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); 548 549 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD)) 550 seq_puts(m, "," MNTOPT_USRQUOTA); 551 else if (mp->m_qflags & XFS_UQUOTA_ACCT) 552 seq_puts(m, "," MNTOPT_UQUOTANOENF); 553 554 /* Either project or group quotas can be active, not both */ 555 556 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 557 if (mp->m_qflags & XFS_OQUOTA_ENFD) 558 seq_puts(m, "," MNTOPT_PRJQUOTA); 559 else 560 seq_puts(m, "," MNTOPT_PQUOTANOENF); 561 } else if (mp->m_qflags & XFS_GQUOTA_ACCT) { 562 if (mp->m_qflags & XFS_OQUOTA_ENFD) 563 seq_puts(m, "," MNTOPT_GRPQUOTA); 564 else 565 seq_puts(m, "," MNTOPT_GQUOTANOENF); 566 } 567 568 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 569 seq_puts(m, "," MNTOPT_NOQUOTA); 570 571 return 0; 572 } 573 __uint64_t 574 xfs_max_file_offset( 575 unsigned int blockshift) 576 { 577 unsigned int pagefactor = 1; 578 unsigned int bitshift = BITS_PER_LONG - 1; 579 580 /* Figure out maximum filesize, on Linux this can depend on 581 * the filesystem blocksize (on 32 bit platforms). 582 * __block_write_begin does this in an [unsigned] long... 583 * page->index << (PAGE_CACHE_SHIFT - bbits) 584 * So, for page sized blocks (4K on 32 bit platforms), 585 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 586 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 587 * but for smaller blocksizes it is less (bbits = log2 bsize). 588 * Note1: get_block_t takes a long (implicit cast from above) 589 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 590 * can optionally convert the [unsigned] long from above into 591 * an [unsigned] long long. 592 */ 593 594 #if BITS_PER_LONG == 32 595 # if defined(CONFIG_LBDAF) 596 ASSERT(sizeof(sector_t) == 8); 597 pagefactor = PAGE_CACHE_SIZE; 598 bitshift = BITS_PER_LONG; 599 # else 600 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); 601 # endif 602 #endif 603 604 return (((__uint64_t)pagefactor) << bitshift) - 1; 605 } 606 607 xfs_agnumber_t 608 xfs_set_inode32(struct xfs_mount *mp) 609 { 610 xfs_agnumber_t index = 0; 611 xfs_agnumber_t maxagi = 0; 612 xfs_sb_t *sbp = &mp->m_sb; 613 xfs_agnumber_t max_metadata; 614 xfs_agino_t agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0); 615 xfs_ino_t ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino); 616 xfs_perag_t *pag; 617 618 /* Calculate how much should be reserved for inodes to meet 619 * the max inode percentage. 620 */ 621 if (mp->m_maxicount) { 622 __uint64_t icount; 623 624 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 625 do_div(icount, 100); 626 icount += sbp->sb_agblocks - 1; 627 do_div(icount, sbp->sb_agblocks); 628 max_metadata = icount; 629 } else { 630 max_metadata = sbp->sb_agcount; 631 } 632 633 for (index = 0; index < sbp->sb_agcount; index++) { 634 ino = XFS_AGINO_TO_INO(mp, index, agino); 635 636 if (ino > XFS_MAXINUMBER_32) { 637 pag = xfs_perag_get(mp, index); 638 pag->pagi_inodeok = 0; 639 pag->pagf_metadata = 0; 640 xfs_perag_put(pag); 641 continue; 642 } 643 644 pag = xfs_perag_get(mp, index); 645 pag->pagi_inodeok = 1; 646 maxagi++; 647 if (index < max_metadata) 648 pag->pagf_metadata = 1; 649 xfs_perag_put(pag); 650 } 651 mp->m_flags |= (XFS_MOUNT_32BITINODES | 652 XFS_MOUNT_SMALL_INUMS); 653 654 return maxagi; 655 } 656 657 xfs_agnumber_t 658 xfs_set_inode64(struct xfs_mount *mp) 659 { 660 xfs_agnumber_t index = 0; 661 662 for (index = 0; index < mp->m_sb.sb_agcount; index++) { 663 struct xfs_perag *pag; 664 665 pag = xfs_perag_get(mp, index); 666 pag->pagi_inodeok = 1; 667 pag->pagf_metadata = 0; 668 xfs_perag_put(pag); 669 } 670 671 /* There is no need for lock protection on m_flags, 672 * the rw_semaphore of the VFS superblock is locked 673 * during mount/umount/remount operations, so this is 674 * enough to avoid concurency on the m_flags field 675 */ 676 mp->m_flags &= ~(XFS_MOUNT_32BITINODES | 677 XFS_MOUNT_SMALL_INUMS); 678 return index; 679 } 680 681 STATIC int 682 xfs_blkdev_get( 683 xfs_mount_t *mp, 684 const char *name, 685 struct block_device **bdevp) 686 { 687 int error = 0; 688 689 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 690 mp); 691 if (IS_ERR(*bdevp)) { 692 error = PTR_ERR(*bdevp); 693 xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error); 694 } 695 696 return -error; 697 } 698 699 STATIC void 700 xfs_blkdev_put( 701 struct block_device *bdev) 702 { 703 if (bdev) 704 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 705 } 706 707 void 708 xfs_blkdev_issue_flush( 709 xfs_buftarg_t *buftarg) 710 { 711 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 712 } 713 714 STATIC void 715 xfs_close_devices( 716 struct xfs_mount *mp) 717 { 718 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 719 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 720 xfs_free_buftarg(mp, mp->m_logdev_targp); 721 xfs_blkdev_put(logdev); 722 } 723 if (mp->m_rtdev_targp) { 724 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 725 xfs_free_buftarg(mp, mp->m_rtdev_targp); 726 xfs_blkdev_put(rtdev); 727 } 728 xfs_free_buftarg(mp, mp->m_ddev_targp); 729 } 730 731 /* 732 * The file system configurations are: 733 * (1) device (partition) with data and internal log 734 * (2) logical volume with data and log subvolumes. 735 * (3) logical volume with data, log, and realtime subvolumes. 736 * 737 * We only have to handle opening the log and realtime volumes here if 738 * they are present. The data subvolume has already been opened by 739 * get_sb_bdev() and is stored in sb->s_bdev. 740 */ 741 STATIC int 742 xfs_open_devices( 743 struct xfs_mount *mp) 744 { 745 struct block_device *ddev = mp->m_super->s_bdev; 746 struct block_device *logdev = NULL, *rtdev = NULL; 747 int error; 748 749 /* 750 * Open real time and log devices - order is important. 751 */ 752 if (mp->m_logname) { 753 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 754 if (error) 755 goto out; 756 } 757 758 if (mp->m_rtname) { 759 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 760 if (error) 761 goto out_close_logdev; 762 763 if (rtdev == ddev || rtdev == logdev) { 764 xfs_warn(mp, 765 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 766 error = EINVAL; 767 goto out_close_rtdev; 768 } 769 } 770 771 /* 772 * Setup xfs_mount buffer target pointers 773 */ 774 error = ENOMEM; 775 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname); 776 if (!mp->m_ddev_targp) 777 goto out_close_rtdev; 778 779 if (rtdev) { 780 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1, 781 mp->m_fsname); 782 if (!mp->m_rtdev_targp) 783 goto out_free_ddev_targ; 784 } 785 786 if (logdev && logdev != ddev) { 787 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1, 788 mp->m_fsname); 789 if (!mp->m_logdev_targp) 790 goto out_free_rtdev_targ; 791 } else { 792 mp->m_logdev_targp = mp->m_ddev_targp; 793 } 794 795 return 0; 796 797 out_free_rtdev_targ: 798 if (mp->m_rtdev_targp) 799 xfs_free_buftarg(mp, mp->m_rtdev_targp); 800 out_free_ddev_targ: 801 xfs_free_buftarg(mp, mp->m_ddev_targp); 802 out_close_rtdev: 803 if (rtdev) 804 xfs_blkdev_put(rtdev); 805 out_close_logdev: 806 if (logdev && logdev != ddev) 807 xfs_blkdev_put(logdev); 808 out: 809 return error; 810 } 811 812 /* 813 * Setup xfs_mount buffer target pointers based on superblock 814 */ 815 STATIC int 816 xfs_setup_devices( 817 struct xfs_mount *mp) 818 { 819 int error; 820 821 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize, 822 mp->m_sb.sb_sectsize); 823 if (error) 824 return error; 825 826 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 827 unsigned int log_sector_size = BBSIZE; 828 829 if (xfs_sb_version_hassector(&mp->m_sb)) 830 log_sector_size = mp->m_sb.sb_logsectsize; 831 error = xfs_setsize_buftarg(mp->m_logdev_targp, 832 mp->m_sb.sb_blocksize, 833 log_sector_size); 834 if (error) 835 return error; 836 } 837 if (mp->m_rtdev_targp) { 838 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 839 mp->m_sb.sb_blocksize, 840 mp->m_sb.sb_sectsize); 841 if (error) 842 return error; 843 } 844 845 return 0; 846 } 847 848 STATIC int 849 xfs_init_mount_workqueues( 850 struct xfs_mount *mp) 851 { 852 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 853 WQ_MEM_RECLAIM, 0, mp->m_fsname); 854 if (!mp->m_data_workqueue) 855 goto out; 856 857 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 858 WQ_MEM_RECLAIM, 0, mp->m_fsname); 859 if (!mp->m_unwritten_workqueue) 860 goto out_destroy_data_iodone_queue; 861 862 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 863 WQ_MEM_RECLAIM, 0, mp->m_fsname); 864 if (!mp->m_cil_workqueue) 865 goto out_destroy_unwritten; 866 return 0; 867 868 out_destroy_unwritten: 869 destroy_workqueue(mp->m_unwritten_workqueue); 870 out_destroy_data_iodone_queue: 871 destroy_workqueue(mp->m_data_workqueue); 872 out: 873 return -ENOMEM; 874 } 875 876 STATIC void 877 xfs_destroy_mount_workqueues( 878 struct xfs_mount *mp) 879 { 880 destroy_workqueue(mp->m_cil_workqueue); 881 destroy_workqueue(mp->m_data_workqueue); 882 destroy_workqueue(mp->m_unwritten_workqueue); 883 } 884 885 /* Catch misguided souls that try to use this interface on XFS */ 886 STATIC struct inode * 887 xfs_fs_alloc_inode( 888 struct super_block *sb) 889 { 890 BUG(); 891 return NULL; 892 } 893 894 /* 895 * Now that the generic code is guaranteed not to be accessing 896 * the linux inode, we can reclaim the inode. 897 */ 898 STATIC void 899 xfs_fs_destroy_inode( 900 struct inode *inode) 901 { 902 struct xfs_inode *ip = XFS_I(inode); 903 904 trace_xfs_destroy_inode(ip); 905 906 XFS_STATS_INC(vn_reclaim); 907 908 /* bad inode, get out here ASAP */ 909 if (is_bad_inode(inode)) 910 goto out_reclaim; 911 912 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 913 914 /* 915 * We should never get here with one of the reclaim flags already set. 916 */ 917 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 918 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 919 920 /* 921 * We always use background reclaim here because even if the 922 * inode is clean, it still may be under IO and hence we have 923 * to take the flush lock. The background reclaim path handles 924 * this more efficiently than we can here, so simply let background 925 * reclaim tear down all inodes. 926 */ 927 out_reclaim: 928 xfs_inode_set_reclaim_tag(ip); 929 } 930 931 /* 932 * Slab object creation initialisation for the XFS inode. 933 * This covers only the idempotent fields in the XFS inode; 934 * all other fields need to be initialised on allocation 935 * from the slab. This avoids the need to repeatedly initialise 936 * fields in the xfs inode that left in the initialise state 937 * when freeing the inode. 938 */ 939 STATIC void 940 xfs_fs_inode_init_once( 941 void *inode) 942 { 943 struct xfs_inode *ip = inode; 944 945 memset(ip, 0, sizeof(struct xfs_inode)); 946 947 /* vfs inode */ 948 inode_init_once(VFS_I(ip)); 949 950 /* xfs inode */ 951 atomic_set(&ip->i_pincount, 0); 952 spin_lock_init(&ip->i_flags_lock); 953 954 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 955 "xfsino", ip->i_ino); 956 } 957 958 STATIC void 959 xfs_fs_evict_inode( 960 struct inode *inode) 961 { 962 xfs_inode_t *ip = XFS_I(inode); 963 964 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 965 966 trace_xfs_evict_inode(ip); 967 968 truncate_inode_pages(&inode->i_data, 0); 969 clear_inode(inode); 970 XFS_STATS_INC(vn_rele); 971 XFS_STATS_INC(vn_remove); 972 XFS_STATS_DEC(vn_active); 973 974 xfs_inactive(ip); 975 } 976 977 /* 978 * We do an unlocked check for XFS_IDONTCACHE here because we are already 979 * serialised against cache hits here via the inode->i_lock and igrab() in 980 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 981 * racing with us, and it avoids needing to grab a spinlock here for every inode 982 * we drop the final reference on. 983 */ 984 STATIC int 985 xfs_fs_drop_inode( 986 struct inode *inode) 987 { 988 struct xfs_inode *ip = XFS_I(inode); 989 990 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 991 } 992 993 STATIC void 994 xfs_free_fsname( 995 struct xfs_mount *mp) 996 { 997 kfree(mp->m_fsname); 998 kfree(mp->m_rtname); 999 kfree(mp->m_logname); 1000 } 1001 1002 STATIC void 1003 xfs_fs_put_super( 1004 struct super_block *sb) 1005 { 1006 struct xfs_mount *mp = XFS_M(sb); 1007 1008 xfs_filestream_unmount(mp); 1009 cancel_delayed_work_sync(&mp->m_sync_work); 1010 xfs_unmountfs(mp); 1011 xfs_syncd_stop(mp); 1012 xfs_freesb(mp); 1013 xfs_icsb_destroy_counters(mp); 1014 xfs_destroy_mount_workqueues(mp); 1015 xfs_close_devices(mp); 1016 xfs_free_fsname(mp); 1017 kfree(mp); 1018 } 1019 1020 STATIC int 1021 xfs_fs_sync_fs( 1022 struct super_block *sb, 1023 int wait) 1024 { 1025 struct xfs_mount *mp = XFS_M(sb); 1026 int error; 1027 1028 /* 1029 * Doing anything during the async pass would be counterproductive. 1030 */ 1031 if (!wait) 1032 return 0; 1033 1034 error = xfs_quiesce_data(mp); 1035 if (error) 1036 return -error; 1037 1038 if (laptop_mode) { 1039 /* 1040 * The disk must be active because we're syncing. 1041 * We schedule xfssyncd now (now that the disk is 1042 * active) instead of later (when it might not be). 1043 */ 1044 flush_delayed_work(&mp->m_sync_work); 1045 } 1046 1047 return 0; 1048 } 1049 1050 STATIC int 1051 xfs_fs_statfs( 1052 struct dentry *dentry, 1053 struct kstatfs *statp) 1054 { 1055 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1056 xfs_sb_t *sbp = &mp->m_sb; 1057 struct xfs_inode *ip = XFS_I(dentry->d_inode); 1058 __uint64_t fakeinos, id; 1059 xfs_extlen_t lsize; 1060 __int64_t ffree; 1061 1062 statp->f_type = XFS_SB_MAGIC; 1063 statp->f_namelen = MAXNAMELEN - 1; 1064 1065 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1066 statp->f_fsid.val[0] = (u32)id; 1067 statp->f_fsid.val[1] = (u32)(id >> 32); 1068 1069 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); 1070 1071 spin_lock(&mp->m_sb_lock); 1072 statp->f_bsize = sbp->sb_blocksize; 1073 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1074 statp->f_blocks = sbp->sb_dblocks - lsize; 1075 statp->f_bfree = statp->f_bavail = 1076 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); 1077 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1078 statp->f_files = 1079 MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1080 if (mp->m_maxicount) 1081 statp->f_files = min_t(typeof(statp->f_files), 1082 statp->f_files, 1083 mp->m_maxicount); 1084 1085 /* make sure statp->f_ffree does not underflow */ 1086 ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree); 1087 statp->f_ffree = max_t(__int64_t, ffree, 0); 1088 1089 spin_unlock(&mp->m_sb_lock); 1090 1091 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1092 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) == 1093 (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD)) 1094 xfs_qm_statvfs(ip, statp); 1095 return 0; 1096 } 1097 1098 STATIC void 1099 xfs_save_resvblks(struct xfs_mount *mp) 1100 { 1101 __uint64_t resblks = 0; 1102 1103 mp->m_resblks_save = mp->m_resblks; 1104 xfs_reserve_blocks(mp, &resblks, NULL); 1105 } 1106 1107 STATIC void 1108 xfs_restore_resvblks(struct xfs_mount *mp) 1109 { 1110 __uint64_t resblks; 1111 1112 if (mp->m_resblks_save) { 1113 resblks = mp->m_resblks_save; 1114 mp->m_resblks_save = 0; 1115 } else 1116 resblks = xfs_default_resblks(mp); 1117 1118 xfs_reserve_blocks(mp, &resblks, NULL); 1119 } 1120 1121 STATIC int 1122 xfs_fs_remount( 1123 struct super_block *sb, 1124 int *flags, 1125 char *options) 1126 { 1127 struct xfs_mount *mp = XFS_M(sb); 1128 substring_t args[MAX_OPT_ARGS]; 1129 char *p; 1130 int error; 1131 1132 while ((p = strsep(&options, ",")) != NULL) { 1133 int token; 1134 1135 if (!*p) 1136 continue; 1137 1138 token = match_token(p, tokens, args); 1139 switch (token) { 1140 case Opt_barrier: 1141 mp->m_flags |= XFS_MOUNT_BARRIER; 1142 break; 1143 case Opt_nobarrier: 1144 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1145 break; 1146 case Opt_inode64: 1147 mp->m_maxagi = xfs_set_inode64(mp); 1148 break; 1149 case Opt_inode32: 1150 mp->m_maxagi = xfs_set_inode32(mp); 1151 break; 1152 default: 1153 /* 1154 * Logically we would return an error here to prevent 1155 * users from believing they might have changed 1156 * mount options using remount which can't be changed. 1157 * 1158 * But unfortunately mount(8) adds all options from 1159 * mtab and fstab to the mount arguments in some cases 1160 * so we can't blindly reject options, but have to 1161 * check for each specified option if it actually 1162 * differs from the currently set option and only 1163 * reject it if that's the case. 1164 * 1165 * Until that is implemented we return success for 1166 * every remount request, and silently ignore all 1167 * options that we can't actually change. 1168 */ 1169 #if 0 1170 xfs_info(mp, 1171 "mount option \"%s\" not supported for remount\n", p); 1172 return -EINVAL; 1173 #else 1174 break; 1175 #endif 1176 } 1177 } 1178 1179 /* ro -> rw */ 1180 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1181 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1182 1183 /* 1184 * If this is the first remount to writeable state we 1185 * might have some superblock changes to update. 1186 */ 1187 if (mp->m_update_flags) { 1188 error = xfs_mount_log_sb(mp, mp->m_update_flags); 1189 if (error) { 1190 xfs_warn(mp, "failed to write sb changes"); 1191 return error; 1192 } 1193 mp->m_update_flags = 0; 1194 } 1195 1196 /* 1197 * Fill out the reserve pool if it is empty. Use the stashed 1198 * value if it is non-zero, otherwise go with the default. 1199 */ 1200 xfs_restore_resvblks(mp); 1201 } 1202 1203 /* rw -> ro */ 1204 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1205 /* 1206 * After we have synced the data but before we sync the 1207 * metadata, we need to free up the reserve block pool so that 1208 * the used block count in the superblock on disk is correct at 1209 * the end of the remount. Stash the current reserve pool size 1210 * so that if we get remounted rw, we can return it to the same 1211 * size. 1212 */ 1213 1214 xfs_quiesce_data(mp); 1215 xfs_save_resvblks(mp); 1216 xfs_quiesce_attr(mp); 1217 mp->m_flags |= XFS_MOUNT_RDONLY; 1218 } 1219 1220 return 0; 1221 } 1222 1223 /* 1224 * Second stage of a freeze. The data is already frozen so we only 1225 * need to take care of the metadata. Once that's done write a dummy 1226 * record to dirty the log in case of a crash while frozen. 1227 */ 1228 STATIC int 1229 xfs_fs_freeze( 1230 struct super_block *sb) 1231 { 1232 struct xfs_mount *mp = XFS_M(sb); 1233 1234 xfs_save_resvblks(mp); 1235 xfs_quiesce_attr(mp); 1236 return -xfs_fs_log_dummy(mp); 1237 } 1238 1239 STATIC int 1240 xfs_fs_unfreeze( 1241 struct super_block *sb) 1242 { 1243 struct xfs_mount *mp = XFS_M(sb); 1244 1245 xfs_restore_resvblks(mp); 1246 return 0; 1247 } 1248 1249 STATIC int 1250 xfs_fs_show_options( 1251 struct seq_file *m, 1252 struct dentry *root) 1253 { 1254 return -xfs_showargs(XFS_M(root->d_sb), m); 1255 } 1256 1257 /* 1258 * This function fills in xfs_mount_t fields based on mount args. 1259 * Note: the superblock _has_ now been read in. 1260 */ 1261 STATIC int 1262 xfs_finish_flags( 1263 struct xfs_mount *mp) 1264 { 1265 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1266 1267 /* Fail a mount where the logbuf is smaller than the log stripe */ 1268 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1269 if (mp->m_logbsize <= 0 && 1270 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1271 mp->m_logbsize = mp->m_sb.sb_logsunit; 1272 } else if (mp->m_logbsize > 0 && 1273 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1274 xfs_warn(mp, 1275 "logbuf size must be greater than or equal to log stripe size"); 1276 return XFS_ERROR(EINVAL); 1277 } 1278 } else { 1279 /* Fail a mount if the logbuf is larger than 32K */ 1280 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1281 xfs_warn(mp, 1282 "logbuf size for version 1 logs must be 16K or 32K"); 1283 return XFS_ERROR(EINVAL); 1284 } 1285 } 1286 1287 /* 1288 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1289 * told by noattr2 to turn it off 1290 */ 1291 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1292 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1293 mp->m_flags |= XFS_MOUNT_ATTR2; 1294 1295 /* 1296 * prohibit r/w mounts of read-only filesystems 1297 */ 1298 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1299 xfs_warn(mp, 1300 "cannot mount a read-only filesystem as read-write"); 1301 return XFS_ERROR(EROFS); 1302 } 1303 1304 return 0; 1305 } 1306 1307 STATIC int 1308 xfs_fs_fill_super( 1309 struct super_block *sb, 1310 void *data, 1311 int silent) 1312 { 1313 struct inode *root; 1314 struct xfs_mount *mp = NULL; 1315 int flags = 0, error = ENOMEM; 1316 1317 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1318 if (!mp) 1319 goto out; 1320 1321 spin_lock_init(&mp->m_sb_lock); 1322 mutex_init(&mp->m_growlock); 1323 atomic_set(&mp->m_active_trans, 0); 1324 1325 mp->m_super = sb; 1326 sb->s_fs_info = mp; 1327 1328 error = xfs_parseargs(mp, (char *)data); 1329 if (error) 1330 goto out_free_fsname; 1331 1332 sb_min_blocksize(sb, BBSIZE); 1333 sb->s_xattr = xfs_xattr_handlers; 1334 sb->s_export_op = &xfs_export_operations; 1335 #ifdef CONFIG_XFS_QUOTA 1336 sb->s_qcop = &xfs_quotactl_operations; 1337 #endif 1338 sb->s_op = &xfs_super_operations; 1339 1340 if (silent) 1341 flags |= XFS_MFSI_QUIET; 1342 1343 error = xfs_open_devices(mp); 1344 if (error) 1345 goto out_free_fsname; 1346 1347 error = xfs_init_mount_workqueues(mp); 1348 if (error) 1349 goto out_close_devices; 1350 1351 error = xfs_icsb_init_counters(mp); 1352 if (error) 1353 goto out_destroy_workqueues; 1354 1355 error = xfs_readsb(mp, flags); 1356 if (error) 1357 goto out_destroy_counters; 1358 1359 error = xfs_finish_flags(mp); 1360 if (error) 1361 goto out_free_sb; 1362 1363 error = xfs_setup_devices(mp); 1364 if (error) 1365 goto out_free_sb; 1366 1367 error = xfs_filestream_mount(mp); 1368 if (error) 1369 goto out_free_sb; 1370 1371 /* 1372 * we must configure the block size in the superblock before we run the 1373 * full mount process as the mount process can lookup and cache inodes. 1374 * For the same reason we must also initialise the syncd and register 1375 * the inode cache shrinker so that inodes can be reclaimed during 1376 * operations like a quotacheck that iterate all inodes in the 1377 * filesystem. 1378 */ 1379 sb->s_magic = XFS_SB_MAGIC; 1380 sb->s_blocksize = mp->m_sb.sb_blocksize; 1381 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1382 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1383 sb->s_max_links = XFS_MAXLINK; 1384 sb->s_time_gran = 1; 1385 set_posix_acl_flag(sb); 1386 1387 error = xfs_syncd_init(mp); 1388 if (error) 1389 goto out_filestream_unmount; 1390 1391 error = xfs_mountfs(mp); 1392 if (error) 1393 goto out_syncd_stop; 1394 1395 root = igrab(VFS_I(mp->m_rootip)); 1396 if (!root) { 1397 error = ENOENT; 1398 goto out_unmount; 1399 } 1400 if (is_bad_inode(root)) { 1401 error = EINVAL; 1402 goto out_unmount; 1403 } 1404 sb->s_root = d_make_root(root); 1405 if (!sb->s_root) { 1406 error = ENOMEM; 1407 goto out_unmount; 1408 } 1409 1410 return 0; 1411 out_syncd_stop: 1412 xfs_syncd_stop(mp); 1413 out_filestream_unmount: 1414 xfs_filestream_unmount(mp); 1415 out_free_sb: 1416 xfs_freesb(mp); 1417 out_destroy_counters: 1418 xfs_icsb_destroy_counters(mp); 1419 out_destroy_workqueues: 1420 xfs_destroy_mount_workqueues(mp); 1421 out_close_devices: 1422 xfs_close_devices(mp); 1423 out_free_fsname: 1424 xfs_free_fsname(mp); 1425 kfree(mp); 1426 out: 1427 return -error; 1428 1429 out_unmount: 1430 xfs_filestream_unmount(mp); 1431 xfs_unmountfs(mp); 1432 xfs_syncd_stop(mp); 1433 goto out_free_sb; 1434 } 1435 1436 STATIC struct dentry * 1437 xfs_fs_mount( 1438 struct file_system_type *fs_type, 1439 int flags, 1440 const char *dev_name, 1441 void *data) 1442 { 1443 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1444 } 1445 1446 static int 1447 xfs_fs_nr_cached_objects( 1448 struct super_block *sb) 1449 { 1450 return xfs_reclaim_inodes_count(XFS_M(sb)); 1451 } 1452 1453 static void 1454 xfs_fs_free_cached_objects( 1455 struct super_block *sb, 1456 int nr_to_scan) 1457 { 1458 xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan); 1459 } 1460 1461 static const struct super_operations xfs_super_operations = { 1462 .alloc_inode = xfs_fs_alloc_inode, 1463 .destroy_inode = xfs_fs_destroy_inode, 1464 .evict_inode = xfs_fs_evict_inode, 1465 .drop_inode = xfs_fs_drop_inode, 1466 .put_super = xfs_fs_put_super, 1467 .sync_fs = xfs_fs_sync_fs, 1468 .freeze_fs = xfs_fs_freeze, 1469 .unfreeze_fs = xfs_fs_unfreeze, 1470 .statfs = xfs_fs_statfs, 1471 .remount_fs = xfs_fs_remount, 1472 .show_options = xfs_fs_show_options, 1473 .nr_cached_objects = xfs_fs_nr_cached_objects, 1474 .free_cached_objects = xfs_fs_free_cached_objects, 1475 }; 1476 1477 static struct file_system_type xfs_fs_type = { 1478 .owner = THIS_MODULE, 1479 .name = "xfs", 1480 .mount = xfs_fs_mount, 1481 .kill_sb = kill_block_super, 1482 .fs_flags = FS_REQUIRES_DEV, 1483 }; 1484 1485 STATIC int __init 1486 xfs_init_zones(void) 1487 { 1488 1489 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend"); 1490 if (!xfs_ioend_zone) 1491 goto out; 1492 1493 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE, 1494 xfs_ioend_zone); 1495 if (!xfs_ioend_pool) 1496 goto out_destroy_ioend_zone; 1497 1498 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1499 "xfs_log_ticket"); 1500 if (!xfs_log_ticket_zone) 1501 goto out_destroy_ioend_pool; 1502 1503 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), 1504 "xfs_bmap_free_item"); 1505 if (!xfs_bmap_free_item_zone) 1506 goto out_destroy_log_ticket_zone; 1507 1508 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1509 "xfs_btree_cur"); 1510 if (!xfs_btree_cur_zone) 1511 goto out_destroy_bmap_free_item_zone; 1512 1513 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1514 "xfs_da_state"); 1515 if (!xfs_da_state_zone) 1516 goto out_destroy_btree_cur_zone; 1517 1518 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1519 if (!xfs_ifork_zone) 1520 goto out_destroy_da_state_zone; 1521 1522 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1523 if (!xfs_trans_zone) 1524 goto out_destroy_ifork_zone; 1525 1526 xfs_log_item_desc_zone = 1527 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1528 "xfs_log_item_desc"); 1529 if (!xfs_log_item_desc_zone) 1530 goto out_destroy_trans_zone; 1531 1532 /* 1533 * The size of the zone allocated buf log item is the maximum 1534 * size possible under XFS. This wastes a little bit of memory, 1535 * but it is much faster. 1536 */ 1537 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item), 1538 "xfs_buf_item"); 1539 if (!xfs_buf_item_zone) 1540 goto out_destroy_log_item_desc_zone; 1541 1542 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1543 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1544 sizeof(xfs_extent_t))), "xfs_efd_item"); 1545 if (!xfs_efd_zone) 1546 goto out_destroy_buf_item_zone; 1547 1548 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1549 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1550 sizeof(xfs_extent_t))), "xfs_efi_item"); 1551 if (!xfs_efi_zone) 1552 goto out_destroy_efd_zone; 1553 1554 xfs_inode_zone = 1555 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1556 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD, 1557 xfs_fs_inode_init_once); 1558 if (!xfs_inode_zone) 1559 goto out_destroy_efi_zone; 1560 1561 xfs_ili_zone = 1562 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1563 KM_ZONE_SPREAD, NULL); 1564 if (!xfs_ili_zone) 1565 goto out_destroy_inode_zone; 1566 1567 return 0; 1568 1569 out_destroy_inode_zone: 1570 kmem_zone_destroy(xfs_inode_zone); 1571 out_destroy_efi_zone: 1572 kmem_zone_destroy(xfs_efi_zone); 1573 out_destroy_efd_zone: 1574 kmem_zone_destroy(xfs_efd_zone); 1575 out_destroy_buf_item_zone: 1576 kmem_zone_destroy(xfs_buf_item_zone); 1577 out_destroy_log_item_desc_zone: 1578 kmem_zone_destroy(xfs_log_item_desc_zone); 1579 out_destroy_trans_zone: 1580 kmem_zone_destroy(xfs_trans_zone); 1581 out_destroy_ifork_zone: 1582 kmem_zone_destroy(xfs_ifork_zone); 1583 out_destroy_da_state_zone: 1584 kmem_zone_destroy(xfs_da_state_zone); 1585 out_destroy_btree_cur_zone: 1586 kmem_zone_destroy(xfs_btree_cur_zone); 1587 out_destroy_bmap_free_item_zone: 1588 kmem_zone_destroy(xfs_bmap_free_item_zone); 1589 out_destroy_log_ticket_zone: 1590 kmem_zone_destroy(xfs_log_ticket_zone); 1591 out_destroy_ioend_pool: 1592 mempool_destroy(xfs_ioend_pool); 1593 out_destroy_ioend_zone: 1594 kmem_zone_destroy(xfs_ioend_zone); 1595 out: 1596 return -ENOMEM; 1597 } 1598 1599 STATIC void 1600 xfs_destroy_zones(void) 1601 { 1602 /* 1603 * Make sure all delayed rcu free are flushed before we 1604 * destroy caches. 1605 */ 1606 rcu_barrier(); 1607 kmem_zone_destroy(xfs_ili_zone); 1608 kmem_zone_destroy(xfs_inode_zone); 1609 kmem_zone_destroy(xfs_efi_zone); 1610 kmem_zone_destroy(xfs_efd_zone); 1611 kmem_zone_destroy(xfs_buf_item_zone); 1612 kmem_zone_destroy(xfs_log_item_desc_zone); 1613 kmem_zone_destroy(xfs_trans_zone); 1614 kmem_zone_destroy(xfs_ifork_zone); 1615 kmem_zone_destroy(xfs_da_state_zone); 1616 kmem_zone_destroy(xfs_btree_cur_zone); 1617 kmem_zone_destroy(xfs_bmap_free_item_zone); 1618 kmem_zone_destroy(xfs_log_ticket_zone); 1619 mempool_destroy(xfs_ioend_pool); 1620 kmem_zone_destroy(xfs_ioend_zone); 1621 1622 } 1623 1624 STATIC int __init 1625 xfs_init_workqueues(void) 1626 { 1627 /* 1628 * We never want to the same work item to run twice, reclaiming inodes 1629 * or idling the log is not going to get any faster by multiple CPUs 1630 * competing for ressources. Use the default large max_active value 1631 * so that even lots of filesystems can perform these task in parallel. 1632 */ 1633 xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0); 1634 if (!xfs_syncd_wq) 1635 return -ENOMEM; 1636 1637 /* 1638 * The allocation workqueue can be used in memory reclaim situations 1639 * (writepage path), and parallelism is only limited by the number of 1640 * AGs in all the filesystems mounted. Hence use the default large 1641 * max_active value for this workqueue. 1642 */ 1643 xfs_alloc_wq = alloc_workqueue("xfsalloc", WQ_MEM_RECLAIM, 0); 1644 if (!xfs_alloc_wq) 1645 goto out_destroy_syncd; 1646 1647 return 0; 1648 1649 out_destroy_syncd: 1650 destroy_workqueue(xfs_syncd_wq); 1651 return -ENOMEM; 1652 } 1653 1654 STATIC void 1655 xfs_destroy_workqueues(void) 1656 { 1657 destroy_workqueue(xfs_alloc_wq); 1658 destroy_workqueue(xfs_syncd_wq); 1659 } 1660 1661 STATIC int __init 1662 init_xfs_fs(void) 1663 { 1664 int error; 1665 1666 printk(KERN_INFO XFS_VERSION_STRING " with " 1667 XFS_BUILD_OPTIONS " enabled\n"); 1668 1669 xfs_dir_startup(); 1670 1671 error = xfs_init_zones(); 1672 if (error) 1673 goto out; 1674 1675 error = xfs_init_workqueues(); 1676 if (error) 1677 goto out_destroy_zones; 1678 1679 error = xfs_mru_cache_init(); 1680 if (error) 1681 goto out_destroy_wq; 1682 1683 error = xfs_filestream_init(); 1684 if (error) 1685 goto out_mru_cache_uninit; 1686 1687 error = xfs_buf_init(); 1688 if (error) 1689 goto out_filestream_uninit; 1690 1691 error = xfs_init_procfs(); 1692 if (error) 1693 goto out_buf_terminate; 1694 1695 error = xfs_sysctl_register(); 1696 if (error) 1697 goto out_cleanup_procfs; 1698 1699 error = xfs_qm_init(); 1700 if (error) 1701 goto out_sysctl_unregister; 1702 1703 error = register_filesystem(&xfs_fs_type); 1704 if (error) 1705 goto out_qm_exit; 1706 return 0; 1707 1708 out_qm_exit: 1709 xfs_qm_exit(); 1710 out_sysctl_unregister: 1711 xfs_sysctl_unregister(); 1712 out_cleanup_procfs: 1713 xfs_cleanup_procfs(); 1714 out_buf_terminate: 1715 xfs_buf_terminate(); 1716 out_filestream_uninit: 1717 xfs_filestream_uninit(); 1718 out_mru_cache_uninit: 1719 xfs_mru_cache_uninit(); 1720 out_destroy_wq: 1721 xfs_destroy_workqueues(); 1722 out_destroy_zones: 1723 xfs_destroy_zones(); 1724 out: 1725 return error; 1726 } 1727 1728 STATIC void __exit 1729 exit_xfs_fs(void) 1730 { 1731 xfs_qm_exit(); 1732 unregister_filesystem(&xfs_fs_type); 1733 xfs_sysctl_unregister(); 1734 xfs_cleanup_procfs(); 1735 xfs_buf_terminate(); 1736 xfs_filestream_uninit(); 1737 xfs_mru_cache_uninit(); 1738 xfs_destroy_workqueues(); 1739 xfs_destroy_zones(); 1740 } 1741 1742 module_init(init_xfs_fs); 1743 module_exit(exit_xfs_fs); 1744 1745 MODULE_AUTHOR("Silicon Graphics, Inc."); 1746 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1747 MODULE_LICENSE("GPL"); 1748