1 /* 2 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 #include "xfs.h" 20 #include "xfs_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_sb.h" 25 #include "xfs_mount.h" 26 #include "xfs_da_format.h" 27 #include "xfs_inode.h" 28 #include "xfs_btree.h" 29 #include "xfs_bmap.h" 30 #include "xfs_alloc.h" 31 #include "xfs_error.h" 32 #include "xfs_fsops.h" 33 #include "xfs_trans.h" 34 #include "xfs_buf_item.h" 35 #include "xfs_log.h" 36 #include "xfs_log_priv.h" 37 #include "xfs_da_btree.h" 38 #include "xfs_dir2.h" 39 #include "xfs_extfree_item.h" 40 #include "xfs_mru_cache.h" 41 #include "xfs_inode_item.h" 42 #include "xfs_icache.h" 43 #include "xfs_trace.h" 44 #include "xfs_icreate_item.h" 45 #include "xfs_filestream.h" 46 #include "xfs_quota.h" 47 #include "xfs_sysfs.h" 48 49 #include <linux/namei.h> 50 #include <linux/init.h> 51 #include <linux/slab.h> 52 #include <linux/mount.h> 53 #include <linux/mempool.h> 54 #include <linux/writeback.h> 55 #include <linux/kthread.h> 56 #include <linux/freezer.h> 57 #include <linux/parser.h> 58 59 static const struct super_operations xfs_super_operations; 60 static kmem_zone_t *xfs_ioend_zone; 61 mempool_t *xfs_ioend_pool; 62 63 static struct kset *xfs_kset; /* top-level xfs sysfs dir */ 64 #ifdef DEBUG 65 static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */ 66 #endif 67 68 #define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */ 69 #define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */ 70 #define MNTOPT_LOGDEV "logdev" /* log device */ 71 #define MNTOPT_RTDEV "rtdev" /* realtime I/O device */ 72 #define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */ 73 #define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */ 74 #define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */ 75 #define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */ 76 #define MNTOPT_SUNIT "sunit" /* data volume stripe unit */ 77 #define MNTOPT_SWIDTH "swidth" /* data volume stripe width */ 78 #define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */ 79 #define MNTOPT_MTPT "mtpt" /* filesystem mount point */ 80 #define MNTOPT_GRPID "grpid" /* group-ID from parent directory */ 81 #define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */ 82 #define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */ 83 #define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */ 84 #define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */ 85 #define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */ 86 #define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and 87 * unwritten extent conversion */ 88 #define MNTOPT_NOBARRIER "nobarrier" /* .. disable */ 89 #define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */ 90 #define MNTOPT_32BITINODE "inode32" /* inode allocation limited to 91 * XFS_MAXINUMBER_32 */ 92 #define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */ 93 #define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ 94 #define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */ 95 #define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes 96 * in stat(). */ 97 #define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */ 98 #define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */ 99 #define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */ 100 #define MNTOPT_QUOTA "quota" /* disk quotas (user) */ 101 #define MNTOPT_NOQUOTA "noquota" /* no quotas */ 102 #define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */ 103 #define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */ 104 #define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */ 105 #define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */ 106 #define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */ 107 #define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */ 108 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */ 109 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */ 110 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */ 111 #define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */ 112 #define MNTOPT_DISCARD "discard" /* Discard unused blocks */ 113 #define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */ 114 115 #define MNTOPT_DAX "dax" /* Enable direct access to bdev pages */ 116 117 /* 118 * Table driven mount option parser. 119 * 120 * Currently only used for remount, but it will be used for mount 121 * in the future, too. 122 */ 123 enum { 124 Opt_barrier, 125 Opt_nobarrier, 126 Opt_inode64, 127 Opt_inode32, 128 Opt_err 129 }; 130 131 static const match_table_t tokens = { 132 {Opt_barrier, "barrier"}, 133 {Opt_nobarrier, "nobarrier"}, 134 {Opt_inode64, "inode64"}, 135 {Opt_inode32, "inode32"}, 136 {Opt_err, NULL} 137 }; 138 139 140 STATIC unsigned long 141 suffix_kstrtoint(char *s, unsigned int base, int *res) 142 { 143 int last, shift_left_factor = 0, _res; 144 char *value = s; 145 146 last = strlen(value) - 1; 147 if (value[last] == 'K' || value[last] == 'k') { 148 shift_left_factor = 10; 149 value[last] = '\0'; 150 } 151 if (value[last] == 'M' || value[last] == 'm') { 152 shift_left_factor = 20; 153 value[last] = '\0'; 154 } 155 if (value[last] == 'G' || value[last] == 'g') { 156 shift_left_factor = 30; 157 value[last] = '\0'; 158 } 159 160 if (kstrtoint(s, base, &_res)) 161 return -EINVAL; 162 *res = _res << shift_left_factor; 163 return 0; 164 } 165 166 /* 167 * This function fills in xfs_mount_t fields based on mount args. 168 * Note: the superblock has _not_ yet been read in. 169 * 170 * Note that this function leaks the various device name allocations on 171 * failure. The caller takes care of them. 172 */ 173 STATIC int 174 xfs_parseargs( 175 struct xfs_mount *mp, 176 char *options) 177 { 178 struct super_block *sb = mp->m_super; 179 char *this_char, *value; 180 int dsunit = 0; 181 int dswidth = 0; 182 int iosize = 0; 183 __uint8_t iosizelog = 0; 184 185 /* 186 * set up the mount name first so all the errors will refer to the 187 * correct device. 188 */ 189 mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL); 190 if (!mp->m_fsname) 191 return -ENOMEM; 192 mp->m_fsname_len = strlen(mp->m_fsname) + 1; 193 194 /* 195 * Copy binary VFS mount flags we are interested in. 196 */ 197 if (sb->s_flags & MS_RDONLY) 198 mp->m_flags |= XFS_MOUNT_RDONLY; 199 if (sb->s_flags & MS_DIRSYNC) 200 mp->m_flags |= XFS_MOUNT_DIRSYNC; 201 if (sb->s_flags & MS_SYNCHRONOUS) 202 mp->m_flags |= XFS_MOUNT_WSYNC; 203 204 /* 205 * Set some default flags that could be cleared by the mount option 206 * parsing. 207 */ 208 mp->m_flags |= XFS_MOUNT_BARRIER; 209 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 210 211 /* 212 * These can be overridden by the mount option parsing. 213 */ 214 mp->m_logbufs = -1; 215 mp->m_logbsize = -1; 216 217 if (!options) 218 goto done; 219 220 while ((this_char = strsep(&options, ",")) != NULL) { 221 if (!*this_char) 222 continue; 223 if ((value = strchr(this_char, '=')) != NULL) 224 *value++ = 0; 225 226 if (!strcmp(this_char, MNTOPT_LOGBUFS)) { 227 if (!value || !*value) { 228 xfs_warn(mp, "%s option requires an argument", 229 this_char); 230 return -EINVAL; 231 } 232 if (kstrtoint(value, 10, &mp->m_logbufs)) 233 return -EINVAL; 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 if (suffix_kstrtoint(value, 10, &mp->m_logbsize)) 241 return -EINVAL; 242 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { 243 if (!value || !*value) { 244 xfs_warn(mp, "%s option requires an argument", 245 this_char); 246 return -EINVAL; 247 } 248 mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 249 if (!mp->m_logname) 250 return -ENOMEM; 251 } else if (!strcmp(this_char, MNTOPT_MTPT)) { 252 xfs_warn(mp, "%s option not allowed on this system", 253 this_char); 254 return -EINVAL; 255 } else if (!strcmp(this_char, MNTOPT_RTDEV)) { 256 if (!value || !*value) { 257 xfs_warn(mp, "%s option requires an argument", 258 this_char); 259 return -EINVAL; 260 } 261 mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL); 262 if (!mp->m_rtname) 263 return -ENOMEM; 264 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE) || 265 !strcmp(this_char, MNTOPT_BIOSIZE)) { 266 if (!value || !*value) { 267 xfs_warn(mp, "%s option requires an argument", 268 this_char); 269 return -EINVAL; 270 } 271 if (suffix_kstrtoint(value, 10, &iosize)) 272 return -EINVAL; 273 iosizelog = ffs(iosize) - 1; 274 } else if (!strcmp(this_char, MNTOPT_GRPID) || 275 !strcmp(this_char, MNTOPT_BSDGROUPS)) { 276 mp->m_flags |= XFS_MOUNT_GRPID; 277 } else if (!strcmp(this_char, MNTOPT_NOGRPID) || 278 !strcmp(this_char, MNTOPT_SYSVGROUPS)) { 279 mp->m_flags &= ~XFS_MOUNT_GRPID; 280 } else if (!strcmp(this_char, MNTOPT_WSYNC)) { 281 mp->m_flags |= XFS_MOUNT_WSYNC; 282 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { 283 mp->m_flags |= XFS_MOUNT_NORECOVERY; 284 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { 285 mp->m_flags |= XFS_MOUNT_NOALIGN; 286 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { 287 mp->m_flags |= XFS_MOUNT_SWALLOC; 288 } else if (!strcmp(this_char, MNTOPT_SUNIT)) { 289 if (!value || !*value) { 290 xfs_warn(mp, "%s option requires an argument", 291 this_char); 292 return -EINVAL; 293 } 294 if (kstrtoint(value, 10, &dsunit)) 295 return -EINVAL; 296 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { 297 if (!value || !*value) { 298 xfs_warn(mp, "%s option requires an argument", 299 this_char); 300 return -EINVAL; 301 } 302 if (kstrtoint(value, 10, &dswidth)) 303 return -EINVAL; 304 } else if (!strcmp(this_char, MNTOPT_32BITINODE)) { 305 mp->m_flags |= XFS_MOUNT_SMALL_INUMS; 306 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { 307 mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS; 308 } else if (!strcmp(this_char, MNTOPT_NOUUID)) { 309 mp->m_flags |= XFS_MOUNT_NOUUID; 310 } else if (!strcmp(this_char, MNTOPT_BARRIER)) { 311 mp->m_flags |= XFS_MOUNT_BARRIER; 312 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) { 313 mp->m_flags &= ~XFS_MOUNT_BARRIER; 314 } else if (!strcmp(this_char, MNTOPT_IKEEP)) { 315 mp->m_flags |= XFS_MOUNT_IKEEP; 316 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { 317 mp->m_flags &= ~XFS_MOUNT_IKEEP; 318 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) { 319 mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE; 320 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) { 321 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE; 322 } else if (!strcmp(this_char, MNTOPT_ATTR2)) { 323 mp->m_flags |= XFS_MOUNT_ATTR2; 324 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) { 325 mp->m_flags &= ~XFS_MOUNT_ATTR2; 326 mp->m_flags |= XFS_MOUNT_NOATTR2; 327 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) { 328 mp->m_flags |= XFS_MOUNT_FILESTREAMS; 329 } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) { 330 mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT; 331 mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD; 332 mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE; 333 } else if (!strcmp(this_char, MNTOPT_QUOTA) || 334 !strcmp(this_char, MNTOPT_UQUOTA) || 335 !strcmp(this_char, MNTOPT_USRQUOTA)) { 336 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE | 337 XFS_UQUOTA_ENFD); 338 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) || 339 !strcmp(this_char, MNTOPT_UQUOTANOENF)) { 340 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE); 341 mp->m_qflags &= ~XFS_UQUOTA_ENFD; 342 } else if (!strcmp(this_char, MNTOPT_PQUOTA) || 343 !strcmp(this_char, MNTOPT_PRJQUOTA)) { 344 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE | 345 XFS_PQUOTA_ENFD); 346 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) { 347 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE); 348 mp->m_qflags &= ~XFS_PQUOTA_ENFD; 349 } else if (!strcmp(this_char, MNTOPT_GQUOTA) || 350 !strcmp(this_char, MNTOPT_GRPQUOTA)) { 351 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE | 352 XFS_GQUOTA_ENFD); 353 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) { 354 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE); 355 mp->m_qflags &= ~XFS_GQUOTA_ENFD; 356 } else if (!strcmp(this_char, MNTOPT_DISCARD)) { 357 mp->m_flags |= XFS_MOUNT_DISCARD; 358 } else if (!strcmp(this_char, MNTOPT_NODISCARD)) { 359 mp->m_flags &= ~XFS_MOUNT_DISCARD; 360 #ifdef CONFIG_FS_DAX 361 } else if (!strcmp(this_char, MNTOPT_DAX)) { 362 mp->m_flags |= XFS_MOUNT_DAX; 363 #endif 364 } else { 365 xfs_warn(mp, "unknown mount option [%s].", this_char); 366 return -EINVAL; 367 } 368 } 369 370 /* 371 * no recovery flag requires a read-only mount 372 */ 373 if ((mp->m_flags & XFS_MOUNT_NORECOVERY) && 374 !(mp->m_flags & XFS_MOUNT_RDONLY)) { 375 xfs_warn(mp, "no-recovery mounts must be read-only."); 376 return -EINVAL; 377 } 378 379 if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) { 380 xfs_warn(mp, 381 "sunit and swidth options incompatible with the noalign option"); 382 return -EINVAL; 383 } 384 385 #ifndef CONFIG_XFS_QUOTA 386 if (XFS_IS_QUOTA_RUNNING(mp)) { 387 xfs_warn(mp, "quota support not available in this kernel."); 388 return -EINVAL; 389 } 390 #endif 391 392 if ((dsunit && !dswidth) || (!dsunit && dswidth)) { 393 xfs_warn(mp, "sunit and swidth must be specified together"); 394 return -EINVAL; 395 } 396 397 if (dsunit && (dswidth % dsunit != 0)) { 398 xfs_warn(mp, 399 "stripe width (%d) must be a multiple of the stripe unit (%d)", 400 dswidth, dsunit); 401 return -EINVAL; 402 } 403 404 done: 405 if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) { 406 /* 407 * At this point the superblock has not been read 408 * in, therefore we do not know the block size. 409 * Before the mount call ends we will convert 410 * these to FSBs. 411 */ 412 mp->m_dalign = dsunit; 413 mp->m_swidth = dswidth; 414 } 415 416 if (mp->m_logbufs != -1 && 417 mp->m_logbufs != 0 && 418 (mp->m_logbufs < XLOG_MIN_ICLOGS || 419 mp->m_logbufs > XLOG_MAX_ICLOGS)) { 420 xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]", 421 mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); 422 return -EINVAL; 423 } 424 if (mp->m_logbsize != -1 && 425 mp->m_logbsize != 0 && 426 (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE || 427 mp->m_logbsize > XLOG_MAX_RECORD_BSIZE || 428 !is_power_of_2(mp->m_logbsize))) { 429 xfs_warn(mp, 430 "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", 431 mp->m_logbsize); 432 return -EINVAL; 433 } 434 435 if (iosizelog) { 436 if (iosizelog > XFS_MAX_IO_LOG || 437 iosizelog < XFS_MIN_IO_LOG) { 438 xfs_warn(mp, "invalid log iosize: %d [not %d-%d]", 439 iosizelog, XFS_MIN_IO_LOG, 440 XFS_MAX_IO_LOG); 441 return -EINVAL; 442 } 443 444 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; 445 mp->m_readio_log = iosizelog; 446 mp->m_writeio_log = iosizelog; 447 } 448 449 return 0; 450 } 451 452 struct proc_xfs_info { 453 uint64_t flag; 454 char *str; 455 }; 456 457 STATIC int 458 xfs_showargs( 459 struct xfs_mount *mp, 460 struct seq_file *m) 461 { 462 static struct proc_xfs_info xfs_info_set[] = { 463 /* the few simple ones we can get from the mount struct */ 464 { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP }, 465 { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, 466 { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, 467 { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, 468 { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, 469 { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, 470 { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 }, 471 { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM }, 472 { XFS_MOUNT_GRPID, "," MNTOPT_GRPID }, 473 { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD }, 474 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_32BITINODE }, 475 { XFS_MOUNT_DAX, "," MNTOPT_DAX }, 476 { 0, NULL } 477 }; 478 static struct proc_xfs_info xfs_info_unset[] = { 479 /* the few simple ones we can get from the mount struct */ 480 { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO }, 481 { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER }, 482 { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE }, 483 { 0, NULL } 484 }; 485 struct proc_xfs_info *xfs_infop; 486 487 for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) { 488 if (mp->m_flags & xfs_infop->flag) 489 seq_puts(m, xfs_infop->str); 490 } 491 for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) { 492 if (!(mp->m_flags & xfs_infop->flag)) 493 seq_puts(m, xfs_infop->str); 494 } 495 496 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) 497 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk", 498 (int)(1 << mp->m_writeio_log) >> 10); 499 500 if (mp->m_logbufs > 0) 501 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs); 502 if (mp->m_logbsize > 0) 503 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10); 504 505 if (mp->m_logname) 506 seq_show_option(m, MNTOPT_LOGDEV, mp->m_logname); 507 if (mp->m_rtname) 508 seq_show_option(m, MNTOPT_RTDEV, mp->m_rtname); 509 510 if (mp->m_dalign > 0) 511 seq_printf(m, "," MNTOPT_SUNIT "=%d", 512 (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); 513 if (mp->m_swidth > 0) 514 seq_printf(m, "," MNTOPT_SWIDTH "=%d", 515 (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); 516 517 if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD)) 518 seq_puts(m, "," MNTOPT_USRQUOTA); 519 else if (mp->m_qflags & XFS_UQUOTA_ACCT) 520 seq_puts(m, "," MNTOPT_UQUOTANOENF); 521 522 if (mp->m_qflags & XFS_PQUOTA_ACCT) { 523 if (mp->m_qflags & XFS_PQUOTA_ENFD) 524 seq_puts(m, "," MNTOPT_PRJQUOTA); 525 else 526 seq_puts(m, "," MNTOPT_PQUOTANOENF); 527 } 528 if (mp->m_qflags & XFS_GQUOTA_ACCT) { 529 if (mp->m_qflags & XFS_GQUOTA_ENFD) 530 seq_puts(m, "," MNTOPT_GRPQUOTA); 531 else 532 seq_puts(m, "," MNTOPT_GQUOTANOENF); 533 } 534 535 if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) 536 seq_puts(m, "," MNTOPT_NOQUOTA); 537 538 return 0; 539 } 540 __uint64_t 541 xfs_max_file_offset( 542 unsigned int blockshift) 543 { 544 unsigned int pagefactor = 1; 545 unsigned int bitshift = BITS_PER_LONG - 1; 546 547 /* Figure out maximum filesize, on Linux this can depend on 548 * the filesystem blocksize (on 32 bit platforms). 549 * __block_write_begin does this in an [unsigned] long... 550 * page->index << (PAGE_CACHE_SHIFT - bbits) 551 * So, for page sized blocks (4K on 32 bit platforms), 552 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is 553 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 554 * but for smaller blocksizes it is less (bbits = log2 bsize). 555 * Note1: get_block_t takes a long (implicit cast from above) 556 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch 557 * can optionally convert the [unsigned] long from above into 558 * an [unsigned] long long. 559 */ 560 561 #if BITS_PER_LONG == 32 562 # if defined(CONFIG_LBDAF) 563 ASSERT(sizeof(sector_t) == 8); 564 pagefactor = PAGE_CACHE_SIZE; 565 bitshift = BITS_PER_LONG; 566 # else 567 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift); 568 # endif 569 #endif 570 571 return (((__uint64_t)pagefactor) << bitshift) - 1; 572 } 573 574 /* 575 * xfs_set_inode32() and xfs_set_inode64() are passed an agcount 576 * because in the growfs case, mp->m_sb.sb_agcount is not updated 577 * yet to the potentially higher ag count. 578 */ 579 xfs_agnumber_t 580 xfs_set_inode32(struct xfs_mount *mp, xfs_agnumber_t agcount) 581 { 582 xfs_agnumber_t index = 0; 583 xfs_agnumber_t maxagi = 0; 584 xfs_sb_t *sbp = &mp->m_sb; 585 xfs_agnumber_t max_metadata; 586 xfs_agino_t agino; 587 xfs_ino_t ino; 588 xfs_perag_t *pag; 589 590 /* Calculate how much should be reserved for inodes to meet 591 * the max inode percentage. 592 */ 593 if (mp->m_maxicount) { 594 __uint64_t icount; 595 596 icount = sbp->sb_dblocks * sbp->sb_imax_pct; 597 do_div(icount, 100); 598 icount += sbp->sb_agblocks - 1; 599 do_div(icount, sbp->sb_agblocks); 600 max_metadata = icount; 601 } else { 602 max_metadata = agcount; 603 } 604 605 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); 606 607 for (index = 0; index < agcount; index++) { 608 ino = XFS_AGINO_TO_INO(mp, index, agino); 609 610 if (ino > XFS_MAXINUMBER_32) { 611 pag = xfs_perag_get(mp, index); 612 pag->pagi_inodeok = 0; 613 pag->pagf_metadata = 0; 614 xfs_perag_put(pag); 615 continue; 616 } 617 618 pag = xfs_perag_get(mp, index); 619 pag->pagi_inodeok = 1; 620 maxagi++; 621 if (index < max_metadata) 622 pag->pagf_metadata = 1; 623 xfs_perag_put(pag); 624 } 625 mp->m_flags |= (XFS_MOUNT_32BITINODES | 626 XFS_MOUNT_SMALL_INUMS); 627 628 return maxagi; 629 } 630 631 xfs_agnumber_t 632 xfs_set_inode64(struct xfs_mount *mp, xfs_agnumber_t agcount) 633 { 634 xfs_agnumber_t index = 0; 635 636 for (index = 0; index < agcount; index++) { 637 struct xfs_perag *pag; 638 639 pag = xfs_perag_get(mp, index); 640 pag->pagi_inodeok = 1; 641 pag->pagf_metadata = 0; 642 xfs_perag_put(pag); 643 } 644 645 /* There is no need for lock protection on m_flags, 646 * the rw_semaphore of the VFS superblock is locked 647 * during mount/umount/remount operations, so this is 648 * enough to avoid concurency on the m_flags field 649 */ 650 mp->m_flags &= ~(XFS_MOUNT_32BITINODES | 651 XFS_MOUNT_SMALL_INUMS); 652 return index; 653 } 654 655 STATIC int 656 xfs_blkdev_get( 657 xfs_mount_t *mp, 658 const char *name, 659 struct block_device **bdevp) 660 { 661 int error = 0; 662 663 *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 664 mp); 665 if (IS_ERR(*bdevp)) { 666 error = PTR_ERR(*bdevp); 667 xfs_warn(mp, "Invalid device [%s], error=%d", name, error); 668 } 669 670 return error; 671 } 672 673 STATIC void 674 xfs_blkdev_put( 675 struct block_device *bdev) 676 { 677 if (bdev) 678 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 679 } 680 681 void 682 xfs_blkdev_issue_flush( 683 xfs_buftarg_t *buftarg) 684 { 685 blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL); 686 } 687 688 STATIC void 689 xfs_close_devices( 690 struct xfs_mount *mp) 691 { 692 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 693 struct block_device *logdev = mp->m_logdev_targp->bt_bdev; 694 xfs_free_buftarg(mp, mp->m_logdev_targp); 695 xfs_blkdev_put(logdev); 696 } 697 if (mp->m_rtdev_targp) { 698 struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev; 699 xfs_free_buftarg(mp, mp->m_rtdev_targp); 700 xfs_blkdev_put(rtdev); 701 } 702 xfs_free_buftarg(mp, mp->m_ddev_targp); 703 } 704 705 /* 706 * The file system configurations are: 707 * (1) device (partition) with data and internal log 708 * (2) logical volume with data and log subvolumes. 709 * (3) logical volume with data, log, and realtime subvolumes. 710 * 711 * We only have to handle opening the log and realtime volumes here if 712 * they are present. The data subvolume has already been opened by 713 * get_sb_bdev() and is stored in sb->s_bdev. 714 */ 715 STATIC int 716 xfs_open_devices( 717 struct xfs_mount *mp) 718 { 719 struct block_device *ddev = mp->m_super->s_bdev; 720 struct block_device *logdev = NULL, *rtdev = NULL; 721 int error; 722 723 /* 724 * Open real time and log devices - order is important. 725 */ 726 if (mp->m_logname) { 727 error = xfs_blkdev_get(mp, mp->m_logname, &logdev); 728 if (error) 729 goto out; 730 } 731 732 if (mp->m_rtname) { 733 error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev); 734 if (error) 735 goto out_close_logdev; 736 737 if (rtdev == ddev || rtdev == logdev) { 738 xfs_warn(mp, 739 "Cannot mount filesystem with identical rtdev and ddev/logdev."); 740 error = -EINVAL; 741 goto out_close_rtdev; 742 } 743 } 744 745 /* 746 * Setup xfs_mount buffer target pointers 747 */ 748 error = -ENOMEM; 749 mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev); 750 if (!mp->m_ddev_targp) 751 goto out_close_rtdev; 752 753 if (rtdev) { 754 mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev); 755 if (!mp->m_rtdev_targp) 756 goto out_free_ddev_targ; 757 } 758 759 if (logdev && logdev != ddev) { 760 mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev); 761 if (!mp->m_logdev_targp) 762 goto out_free_rtdev_targ; 763 } else { 764 mp->m_logdev_targp = mp->m_ddev_targp; 765 } 766 767 return 0; 768 769 out_free_rtdev_targ: 770 if (mp->m_rtdev_targp) 771 xfs_free_buftarg(mp, mp->m_rtdev_targp); 772 out_free_ddev_targ: 773 xfs_free_buftarg(mp, mp->m_ddev_targp); 774 out_close_rtdev: 775 xfs_blkdev_put(rtdev); 776 out_close_logdev: 777 if (logdev && logdev != ddev) 778 xfs_blkdev_put(logdev); 779 out: 780 return error; 781 } 782 783 /* 784 * Setup xfs_mount buffer target pointers based on superblock 785 */ 786 STATIC int 787 xfs_setup_devices( 788 struct xfs_mount *mp) 789 { 790 int error; 791 792 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize); 793 if (error) 794 return error; 795 796 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) { 797 unsigned int log_sector_size = BBSIZE; 798 799 if (xfs_sb_version_hassector(&mp->m_sb)) 800 log_sector_size = mp->m_sb.sb_logsectsize; 801 error = xfs_setsize_buftarg(mp->m_logdev_targp, 802 log_sector_size); 803 if (error) 804 return error; 805 } 806 if (mp->m_rtdev_targp) { 807 error = xfs_setsize_buftarg(mp->m_rtdev_targp, 808 mp->m_sb.sb_sectsize); 809 if (error) 810 return error; 811 } 812 813 return 0; 814 } 815 816 STATIC int 817 xfs_init_mount_workqueues( 818 struct xfs_mount *mp) 819 { 820 mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s", 821 WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname); 822 if (!mp->m_buf_workqueue) 823 goto out; 824 825 mp->m_data_workqueue = alloc_workqueue("xfs-data/%s", 826 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 827 if (!mp->m_data_workqueue) 828 goto out_destroy_buf; 829 830 mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s", 831 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 832 if (!mp->m_unwritten_workqueue) 833 goto out_destroy_data_iodone_queue; 834 835 mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s", 836 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 837 if (!mp->m_cil_workqueue) 838 goto out_destroy_unwritten; 839 840 mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s", 841 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 842 if (!mp->m_reclaim_workqueue) 843 goto out_destroy_cil; 844 845 mp->m_log_workqueue = alloc_workqueue("xfs-log/%s", 846 WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0, 847 mp->m_fsname); 848 if (!mp->m_log_workqueue) 849 goto out_destroy_reclaim; 850 851 mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s", 852 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname); 853 if (!mp->m_eofblocks_workqueue) 854 goto out_destroy_log; 855 856 return 0; 857 858 out_destroy_log: 859 destroy_workqueue(mp->m_log_workqueue); 860 out_destroy_reclaim: 861 destroy_workqueue(mp->m_reclaim_workqueue); 862 out_destroy_cil: 863 destroy_workqueue(mp->m_cil_workqueue); 864 out_destroy_unwritten: 865 destroy_workqueue(mp->m_unwritten_workqueue); 866 out_destroy_data_iodone_queue: 867 destroy_workqueue(mp->m_data_workqueue); 868 out_destroy_buf: 869 destroy_workqueue(mp->m_buf_workqueue); 870 out: 871 return -ENOMEM; 872 } 873 874 STATIC void 875 xfs_destroy_mount_workqueues( 876 struct xfs_mount *mp) 877 { 878 destroy_workqueue(mp->m_eofblocks_workqueue); 879 destroy_workqueue(mp->m_log_workqueue); 880 destroy_workqueue(mp->m_reclaim_workqueue); 881 destroy_workqueue(mp->m_cil_workqueue); 882 destroy_workqueue(mp->m_data_workqueue); 883 destroy_workqueue(mp->m_unwritten_workqueue); 884 destroy_workqueue(mp->m_buf_workqueue); 885 } 886 887 /* 888 * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK 889 * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting 890 * for IO to complete so that we effectively throttle multiple callers to the 891 * rate at which IO is completing. 892 */ 893 void 894 xfs_flush_inodes( 895 struct xfs_mount *mp) 896 { 897 struct super_block *sb = mp->m_super; 898 899 if (down_read_trylock(&sb->s_umount)) { 900 sync_inodes_sb(sb); 901 up_read(&sb->s_umount); 902 } 903 } 904 905 /* Catch misguided souls that try to use this interface on XFS */ 906 STATIC struct inode * 907 xfs_fs_alloc_inode( 908 struct super_block *sb) 909 { 910 BUG(); 911 return NULL; 912 } 913 914 /* 915 * Now that the generic code is guaranteed not to be accessing 916 * the linux inode, we can reclaim the inode. 917 */ 918 STATIC void 919 xfs_fs_destroy_inode( 920 struct inode *inode) 921 { 922 struct xfs_inode *ip = XFS_I(inode); 923 924 trace_xfs_destroy_inode(ip); 925 926 XFS_STATS_INC(ip->i_mount, vn_reclaim); 927 928 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); 929 930 /* 931 * We should never get here with one of the reclaim flags already set. 932 */ 933 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); 934 ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM)); 935 936 /* 937 * We always use background reclaim here because even if the 938 * inode is clean, it still may be under IO and hence we have 939 * to take the flush lock. The background reclaim path handles 940 * this more efficiently than we can here, so simply let background 941 * reclaim tear down all inodes. 942 */ 943 xfs_inode_set_reclaim_tag(ip); 944 } 945 946 /* 947 * Slab object creation initialisation for the XFS inode. 948 * This covers only the idempotent fields in the XFS inode; 949 * all other fields need to be initialised on allocation 950 * from the slab. This avoids the need to repeatedly initialise 951 * fields in the xfs inode that left in the initialise state 952 * when freeing the inode. 953 */ 954 STATIC void 955 xfs_fs_inode_init_once( 956 void *inode) 957 { 958 struct xfs_inode *ip = inode; 959 960 memset(ip, 0, sizeof(struct xfs_inode)); 961 962 /* vfs inode */ 963 inode_init_once(VFS_I(ip)); 964 965 /* xfs inode */ 966 atomic_set(&ip->i_pincount, 0); 967 spin_lock_init(&ip->i_flags_lock); 968 969 mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 970 "xfsino", ip->i_ino); 971 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, 972 "xfsino", ip->i_ino); 973 } 974 975 STATIC void 976 xfs_fs_evict_inode( 977 struct inode *inode) 978 { 979 xfs_inode_t *ip = XFS_I(inode); 980 981 ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock)); 982 983 trace_xfs_evict_inode(ip); 984 985 truncate_inode_pages_final(&inode->i_data); 986 clear_inode(inode); 987 XFS_STATS_INC(ip->i_mount, vn_rele); 988 XFS_STATS_INC(ip->i_mount, vn_remove); 989 990 xfs_inactive(ip); 991 } 992 993 /* 994 * We do an unlocked check for XFS_IDONTCACHE here because we are already 995 * serialised against cache hits here via the inode->i_lock and igrab() in 996 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be 997 * racing with us, and it avoids needing to grab a spinlock here for every inode 998 * we drop the final reference on. 999 */ 1000 STATIC int 1001 xfs_fs_drop_inode( 1002 struct inode *inode) 1003 { 1004 struct xfs_inode *ip = XFS_I(inode); 1005 1006 return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); 1007 } 1008 1009 STATIC void 1010 xfs_free_fsname( 1011 struct xfs_mount *mp) 1012 { 1013 kfree(mp->m_fsname); 1014 kfree(mp->m_rtname); 1015 kfree(mp->m_logname); 1016 } 1017 1018 STATIC int 1019 xfs_fs_sync_fs( 1020 struct super_block *sb, 1021 int wait) 1022 { 1023 struct xfs_mount *mp = XFS_M(sb); 1024 1025 /* 1026 * Doing anything during the async pass would be counterproductive. 1027 */ 1028 if (!wait) 1029 return 0; 1030 1031 xfs_log_force(mp, XFS_LOG_SYNC); 1032 if (laptop_mode) { 1033 /* 1034 * The disk must be active because we're syncing. 1035 * We schedule log work now (now that the disk is 1036 * active) instead of later (when it might not be). 1037 */ 1038 flush_delayed_work(&mp->m_log->l_work); 1039 } 1040 1041 return 0; 1042 } 1043 1044 STATIC int 1045 xfs_fs_statfs( 1046 struct dentry *dentry, 1047 struct kstatfs *statp) 1048 { 1049 struct xfs_mount *mp = XFS_M(dentry->d_sb); 1050 xfs_sb_t *sbp = &mp->m_sb; 1051 struct xfs_inode *ip = XFS_I(d_inode(dentry)); 1052 __uint64_t fakeinos, id; 1053 __uint64_t icount; 1054 __uint64_t ifree; 1055 __uint64_t fdblocks; 1056 xfs_extlen_t lsize; 1057 __int64_t ffree; 1058 1059 statp->f_type = XFS_SB_MAGIC; 1060 statp->f_namelen = MAXNAMELEN - 1; 1061 1062 id = huge_encode_dev(mp->m_ddev_targp->bt_dev); 1063 statp->f_fsid.val[0] = (u32)id; 1064 statp->f_fsid.val[1] = (u32)(id >> 32); 1065 1066 icount = percpu_counter_sum(&mp->m_icount); 1067 ifree = percpu_counter_sum(&mp->m_ifree); 1068 fdblocks = percpu_counter_sum(&mp->m_fdblocks); 1069 1070 spin_lock(&mp->m_sb_lock); 1071 statp->f_bsize = sbp->sb_blocksize; 1072 lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; 1073 statp->f_blocks = sbp->sb_dblocks - lsize; 1074 spin_unlock(&mp->m_sb_lock); 1075 1076 statp->f_bfree = fdblocks - XFS_ALLOC_SET_ASIDE(mp); 1077 statp->f_bavail = statp->f_bfree; 1078 1079 fakeinos = statp->f_bfree << sbp->sb_inopblog; 1080 statp->f_files = MIN(icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); 1081 if (mp->m_maxicount) 1082 statp->f_files = min_t(typeof(statp->f_files), 1083 statp->f_files, 1084 mp->m_maxicount); 1085 1086 /* If sb_icount overshot maxicount, report actual allocation */ 1087 statp->f_files = max_t(typeof(statp->f_files), 1088 statp->f_files, 1089 sbp->sb_icount); 1090 1091 /* make sure statp->f_ffree does not underflow */ 1092 ffree = statp->f_files - (icount - ifree); 1093 statp->f_ffree = max_t(__int64_t, ffree, 0); 1094 1095 1096 if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && 1097 ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) == 1098 (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD)) 1099 xfs_qm_statvfs(ip, statp); 1100 return 0; 1101 } 1102 1103 STATIC void 1104 xfs_save_resvblks(struct xfs_mount *mp) 1105 { 1106 __uint64_t resblks = 0; 1107 1108 mp->m_resblks_save = mp->m_resblks; 1109 xfs_reserve_blocks(mp, &resblks, NULL); 1110 } 1111 1112 STATIC void 1113 xfs_restore_resvblks(struct xfs_mount *mp) 1114 { 1115 __uint64_t resblks; 1116 1117 if (mp->m_resblks_save) { 1118 resblks = mp->m_resblks_save; 1119 mp->m_resblks_save = 0; 1120 } else 1121 resblks = xfs_default_resblks(mp); 1122 1123 xfs_reserve_blocks(mp, &resblks, NULL); 1124 } 1125 1126 /* 1127 * Trigger writeback of all the dirty metadata in the file system. 1128 * 1129 * This ensures that the metadata is written to their location on disk rather 1130 * than just existing in transactions in the log. This means after a quiesce 1131 * there is no log replay required to write the inodes to disk - this is the 1132 * primary difference between a sync and a quiesce. 1133 * 1134 * Note: xfs_log_quiesce() stops background log work - the callers must ensure 1135 * it is started again when appropriate. 1136 */ 1137 static void 1138 xfs_quiesce_attr( 1139 struct xfs_mount *mp) 1140 { 1141 int error = 0; 1142 1143 /* wait for all modifications to complete */ 1144 while (atomic_read(&mp->m_active_trans) > 0) 1145 delay(100); 1146 1147 /* force the log to unpin objects from the now complete transactions */ 1148 xfs_log_force(mp, XFS_LOG_SYNC); 1149 1150 /* reclaim inodes to do any IO before the freeze completes */ 1151 xfs_reclaim_inodes(mp, 0); 1152 xfs_reclaim_inodes(mp, SYNC_WAIT); 1153 1154 /* Push the superblock and write an unmount record */ 1155 error = xfs_log_sbcount(mp); 1156 if (error) 1157 xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. " 1158 "Frozen image may not be consistent."); 1159 /* 1160 * Just warn here till VFS can correctly support 1161 * read-only remount without racing. 1162 */ 1163 WARN_ON(atomic_read(&mp->m_active_trans) != 0); 1164 1165 xfs_log_quiesce(mp); 1166 } 1167 1168 STATIC int 1169 xfs_fs_remount( 1170 struct super_block *sb, 1171 int *flags, 1172 char *options) 1173 { 1174 struct xfs_mount *mp = XFS_M(sb); 1175 xfs_sb_t *sbp = &mp->m_sb; 1176 substring_t args[MAX_OPT_ARGS]; 1177 char *p; 1178 int error; 1179 1180 sync_filesystem(sb); 1181 while ((p = strsep(&options, ",")) != NULL) { 1182 int token; 1183 1184 if (!*p) 1185 continue; 1186 1187 token = match_token(p, tokens, args); 1188 switch (token) { 1189 case Opt_barrier: 1190 mp->m_flags |= XFS_MOUNT_BARRIER; 1191 break; 1192 case Opt_nobarrier: 1193 mp->m_flags &= ~XFS_MOUNT_BARRIER; 1194 break; 1195 case Opt_inode64: 1196 mp->m_maxagi = xfs_set_inode64(mp, sbp->sb_agcount); 1197 break; 1198 case Opt_inode32: 1199 mp->m_maxagi = xfs_set_inode32(mp, sbp->sb_agcount); 1200 break; 1201 default: 1202 /* 1203 * Logically we would return an error here to prevent 1204 * users from believing they might have changed 1205 * mount options using remount which can't be changed. 1206 * 1207 * But unfortunately mount(8) adds all options from 1208 * mtab and fstab to the mount arguments in some cases 1209 * so we can't blindly reject options, but have to 1210 * check for each specified option if it actually 1211 * differs from the currently set option and only 1212 * reject it if that's the case. 1213 * 1214 * Until that is implemented we return success for 1215 * every remount request, and silently ignore all 1216 * options that we can't actually change. 1217 */ 1218 #if 0 1219 xfs_info(mp, 1220 "mount option \"%s\" not supported for remount", p); 1221 return -EINVAL; 1222 #else 1223 break; 1224 #endif 1225 } 1226 } 1227 1228 /* ro -> rw */ 1229 if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) { 1230 if (mp->m_flags & XFS_MOUNT_NORECOVERY) { 1231 xfs_warn(mp, 1232 "ro->rw transition prohibited on norecovery mount"); 1233 return -EINVAL; 1234 } 1235 1236 mp->m_flags &= ~XFS_MOUNT_RDONLY; 1237 1238 /* 1239 * If this is the first remount to writeable state we 1240 * might have some superblock changes to update. 1241 */ 1242 if (mp->m_update_sb) { 1243 error = xfs_sync_sb(mp, false); 1244 if (error) { 1245 xfs_warn(mp, "failed to write sb changes"); 1246 return error; 1247 } 1248 mp->m_update_sb = false; 1249 } 1250 1251 /* 1252 * Fill out the reserve pool if it is empty. Use the stashed 1253 * value if it is non-zero, otherwise go with the default. 1254 */ 1255 xfs_restore_resvblks(mp); 1256 xfs_log_work_queue(mp); 1257 } 1258 1259 /* rw -> ro */ 1260 if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) { 1261 /* 1262 * Before we sync the metadata, we need to free up the reserve 1263 * block pool so that the used block count in the superblock on 1264 * disk is correct at the end of the remount. Stash the current 1265 * reserve pool size so that if we get remounted rw, we can 1266 * return it to the same size. 1267 */ 1268 xfs_save_resvblks(mp); 1269 xfs_quiesce_attr(mp); 1270 mp->m_flags |= XFS_MOUNT_RDONLY; 1271 } 1272 1273 return 0; 1274 } 1275 1276 /* 1277 * Second stage of a freeze. The data is already frozen so we only 1278 * need to take care of the metadata. Once that's done sync the superblock 1279 * to the log to dirty it in case of a crash while frozen. This ensures that we 1280 * will recover the unlinked inode lists on the next mount. 1281 */ 1282 STATIC int 1283 xfs_fs_freeze( 1284 struct super_block *sb) 1285 { 1286 struct xfs_mount *mp = XFS_M(sb); 1287 1288 xfs_save_resvblks(mp); 1289 xfs_quiesce_attr(mp); 1290 return xfs_sync_sb(mp, true); 1291 } 1292 1293 STATIC int 1294 xfs_fs_unfreeze( 1295 struct super_block *sb) 1296 { 1297 struct xfs_mount *mp = XFS_M(sb); 1298 1299 xfs_restore_resvblks(mp); 1300 xfs_log_work_queue(mp); 1301 return 0; 1302 } 1303 1304 STATIC int 1305 xfs_fs_show_options( 1306 struct seq_file *m, 1307 struct dentry *root) 1308 { 1309 return xfs_showargs(XFS_M(root->d_sb), m); 1310 } 1311 1312 /* 1313 * This function fills in xfs_mount_t fields based on mount args. 1314 * Note: the superblock _has_ now been read in. 1315 */ 1316 STATIC int 1317 xfs_finish_flags( 1318 struct xfs_mount *mp) 1319 { 1320 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY); 1321 1322 /* Fail a mount where the logbuf is smaller than the log stripe */ 1323 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1324 if (mp->m_logbsize <= 0 && 1325 mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) { 1326 mp->m_logbsize = mp->m_sb.sb_logsunit; 1327 } else if (mp->m_logbsize > 0 && 1328 mp->m_logbsize < mp->m_sb.sb_logsunit) { 1329 xfs_warn(mp, 1330 "logbuf size must be greater than or equal to log stripe size"); 1331 return -EINVAL; 1332 } 1333 } else { 1334 /* Fail a mount if the logbuf is larger than 32K */ 1335 if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) { 1336 xfs_warn(mp, 1337 "logbuf size for version 1 logs must be 16K or 32K"); 1338 return -EINVAL; 1339 } 1340 } 1341 1342 /* 1343 * V5 filesystems always use attr2 format for attributes. 1344 */ 1345 if (xfs_sb_version_hascrc(&mp->m_sb) && 1346 (mp->m_flags & XFS_MOUNT_NOATTR2)) { 1347 xfs_warn(mp, 1348 "Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.", 1349 MNTOPT_NOATTR2, MNTOPT_ATTR2); 1350 return -EINVAL; 1351 } 1352 1353 /* 1354 * mkfs'ed attr2 will turn on attr2 mount unless explicitly 1355 * told by noattr2 to turn it off 1356 */ 1357 if (xfs_sb_version_hasattr2(&mp->m_sb) && 1358 !(mp->m_flags & XFS_MOUNT_NOATTR2)) 1359 mp->m_flags |= XFS_MOUNT_ATTR2; 1360 1361 /* 1362 * prohibit r/w mounts of read-only filesystems 1363 */ 1364 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { 1365 xfs_warn(mp, 1366 "cannot mount a read-only filesystem as read-write"); 1367 return -EROFS; 1368 } 1369 1370 if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) && 1371 (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) && 1372 !xfs_sb_version_has_pquotino(&mp->m_sb)) { 1373 xfs_warn(mp, 1374 "Super block does not support project and group quota together"); 1375 return -EINVAL; 1376 } 1377 1378 return 0; 1379 } 1380 1381 static int 1382 xfs_init_percpu_counters( 1383 struct xfs_mount *mp) 1384 { 1385 int error; 1386 1387 error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL); 1388 if (error) 1389 return -ENOMEM; 1390 1391 error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL); 1392 if (error) 1393 goto free_icount; 1394 1395 error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL); 1396 if (error) 1397 goto free_ifree; 1398 1399 return 0; 1400 1401 free_ifree: 1402 percpu_counter_destroy(&mp->m_ifree); 1403 free_icount: 1404 percpu_counter_destroy(&mp->m_icount); 1405 return -ENOMEM; 1406 } 1407 1408 void 1409 xfs_reinit_percpu_counters( 1410 struct xfs_mount *mp) 1411 { 1412 percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount); 1413 percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree); 1414 percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks); 1415 } 1416 1417 static void 1418 xfs_destroy_percpu_counters( 1419 struct xfs_mount *mp) 1420 { 1421 percpu_counter_destroy(&mp->m_icount); 1422 percpu_counter_destroy(&mp->m_ifree); 1423 percpu_counter_destroy(&mp->m_fdblocks); 1424 } 1425 1426 STATIC int 1427 xfs_fs_fill_super( 1428 struct super_block *sb, 1429 void *data, 1430 int silent) 1431 { 1432 struct inode *root; 1433 struct xfs_mount *mp = NULL; 1434 int flags = 0, error = -ENOMEM; 1435 1436 mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL); 1437 if (!mp) 1438 goto out; 1439 1440 spin_lock_init(&mp->m_sb_lock); 1441 mutex_init(&mp->m_growlock); 1442 atomic_set(&mp->m_active_trans, 0); 1443 INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker); 1444 INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker); 1445 mp->m_kobj.kobject.kset = xfs_kset; 1446 1447 mp->m_super = sb; 1448 sb->s_fs_info = mp; 1449 1450 error = xfs_parseargs(mp, (char *)data); 1451 if (error) 1452 goto out_free_fsname; 1453 1454 sb_min_blocksize(sb, BBSIZE); 1455 sb->s_xattr = xfs_xattr_handlers; 1456 sb->s_export_op = &xfs_export_operations; 1457 #ifdef CONFIG_XFS_QUOTA 1458 sb->s_qcop = &xfs_quotactl_operations; 1459 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; 1460 #endif 1461 sb->s_op = &xfs_super_operations; 1462 1463 if (silent) 1464 flags |= XFS_MFSI_QUIET; 1465 1466 error = xfs_open_devices(mp); 1467 if (error) 1468 goto out_free_fsname; 1469 1470 error = xfs_init_mount_workqueues(mp); 1471 if (error) 1472 goto out_close_devices; 1473 1474 error = xfs_init_percpu_counters(mp); 1475 if (error) 1476 goto out_destroy_workqueues; 1477 1478 /* Allocate stats memory before we do operations that might use it */ 1479 mp->m_stats.xs_stats = alloc_percpu(struct xfsstats); 1480 if (!mp->m_stats.xs_stats) { 1481 error = -ENOMEM; 1482 goto out_destroy_counters; 1483 } 1484 1485 error = xfs_readsb(mp, flags); 1486 if (error) 1487 goto out_free_stats; 1488 1489 error = xfs_finish_flags(mp); 1490 if (error) 1491 goto out_free_sb; 1492 1493 error = xfs_setup_devices(mp); 1494 if (error) 1495 goto out_free_sb; 1496 1497 error = xfs_filestream_mount(mp); 1498 if (error) 1499 goto out_free_sb; 1500 1501 /* 1502 * we must configure the block size in the superblock before we run the 1503 * full mount process as the mount process can lookup and cache inodes. 1504 */ 1505 sb->s_magic = XFS_SB_MAGIC; 1506 sb->s_blocksize = mp->m_sb.sb_blocksize; 1507 sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; 1508 sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits); 1509 sb->s_max_links = XFS_MAXLINK; 1510 sb->s_time_gran = 1; 1511 set_posix_acl_flag(sb); 1512 1513 /* version 5 superblocks support inode version counters. */ 1514 if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5) 1515 sb->s_flags |= MS_I_VERSION; 1516 1517 if (mp->m_flags & XFS_MOUNT_DAX) { 1518 xfs_warn(mp, 1519 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 1520 if (sb->s_blocksize != PAGE_SIZE) { 1521 xfs_alert(mp, 1522 "Filesystem block size invalid for DAX Turning DAX off."); 1523 mp->m_flags &= ~XFS_MOUNT_DAX; 1524 } else if (!sb->s_bdev->bd_disk->fops->direct_access) { 1525 xfs_alert(mp, 1526 "Block device does not support DAX Turning DAX off."); 1527 mp->m_flags &= ~XFS_MOUNT_DAX; 1528 } 1529 } 1530 1531 if (xfs_sb_version_hassparseinodes(&mp->m_sb)) 1532 xfs_alert(mp, 1533 "EXPERIMENTAL sparse inode feature enabled. Use at your own risk!"); 1534 1535 error = xfs_mountfs(mp); 1536 if (error) 1537 goto out_filestream_unmount; 1538 1539 root = igrab(VFS_I(mp->m_rootip)); 1540 if (!root) { 1541 error = -ENOENT; 1542 goto out_unmount; 1543 } 1544 sb->s_root = d_make_root(root); 1545 if (!sb->s_root) { 1546 error = -ENOMEM; 1547 goto out_unmount; 1548 } 1549 1550 return 0; 1551 1552 out_filestream_unmount: 1553 xfs_filestream_unmount(mp); 1554 out_free_sb: 1555 xfs_freesb(mp); 1556 out_free_stats: 1557 free_percpu(mp->m_stats.xs_stats); 1558 out_destroy_counters: 1559 xfs_destroy_percpu_counters(mp); 1560 out_destroy_workqueues: 1561 xfs_destroy_mount_workqueues(mp); 1562 out_close_devices: 1563 xfs_close_devices(mp); 1564 out_free_fsname: 1565 xfs_free_fsname(mp); 1566 kfree(mp); 1567 out: 1568 return error; 1569 1570 out_unmount: 1571 xfs_filestream_unmount(mp); 1572 xfs_unmountfs(mp); 1573 goto out_free_sb; 1574 } 1575 1576 STATIC void 1577 xfs_fs_put_super( 1578 struct super_block *sb) 1579 { 1580 struct xfs_mount *mp = XFS_M(sb); 1581 1582 xfs_notice(mp, "Unmounting Filesystem"); 1583 xfs_filestream_unmount(mp); 1584 xfs_unmountfs(mp); 1585 1586 xfs_freesb(mp); 1587 free_percpu(mp->m_stats.xs_stats); 1588 xfs_destroy_percpu_counters(mp); 1589 xfs_destroy_mount_workqueues(mp); 1590 xfs_close_devices(mp); 1591 xfs_free_fsname(mp); 1592 kfree(mp); 1593 } 1594 1595 STATIC struct dentry * 1596 xfs_fs_mount( 1597 struct file_system_type *fs_type, 1598 int flags, 1599 const char *dev_name, 1600 void *data) 1601 { 1602 return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super); 1603 } 1604 1605 static long 1606 xfs_fs_nr_cached_objects( 1607 struct super_block *sb, 1608 struct shrink_control *sc) 1609 { 1610 return xfs_reclaim_inodes_count(XFS_M(sb)); 1611 } 1612 1613 static long 1614 xfs_fs_free_cached_objects( 1615 struct super_block *sb, 1616 struct shrink_control *sc) 1617 { 1618 return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan); 1619 } 1620 1621 static const struct super_operations xfs_super_operations = { 1622 .alloc_inode = xfs_fs_alloc_inode, 1623 .destroy_inode = xfs_fs_destroy_inode, 1624 .evict_inode = xfs_fs_evict_inode, 1625 .drop_inode = xfs_fs_drop_inode, 1626 .put_super = xfs_fs_put_super, 1627 .sync_fs = xfs_fs_sync_fs, 1628 .freeze_fs = xfs_fs_freeze, 1629 .unfreeze_fs = xfs_fs_unfreeze, 1630 .statfs = xfs_fs_statfs, 1631 .remount_fs = xfs_fs_remount, 1632 .show_options = xfs_fs_show_options, 1633 .nr_cached_objects = xfs_fs_nr_cached_objects, 1634 .free_cached_objects = xfs_fs_free_cached_objects, 1635 }; 1636 1637 static struct file_system_type xfs_fs_type = { 1638 .owner = THIS_MODULE, 1639 .name = "xfs", 1640 .mount = xfs_fs_mount, 1641 .kill_sb = kill_block_super, 1642 .fs_flags = FS_REQUIRES_DEV, 1643 }; 1644 MODULE_ALIAS_FS("xfs"); 1645 1646 STATIC int __init 1647 xfs_init_zones(void) 1648 { 1649 1650 xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend"); 1651 if (!xfs_ioend_zone) 1652 goto out; 1653 1654 xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE, 1655 xfs_ioend_zone); 1656 if (!xfs_ioend_pool) 1657 goto out_destroy_ioend_zone; 1658 1659 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t), 1660 "xfs_log_ticket"); 1661 if (!xfs_log_ticket_zone) 1662 goto out_destroy_ioend_pool; 1663 1664 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), 1665 "xfs_bmap_free_item"); 1666 if (!xfs_bmap_free_item_zone) 1667 goto out_destroy_log_ticket_zone; 1668 1669 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), 1670 "xfs_btree_cur"); 1671 if (!xfs_btree_cur_zone) 1672 goto out_destroy_bmap_free_item_zone; 1673 1674 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t), 1675 "xfs_da_state"); 1676 if (!xfs_da_state_zone) 1677 goto out_destroy_btree_cur_zone; 1678 1679 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); 1680 if (!xfs_ifork_zone) 1681 goto out_destroy_da_state_zone; 1682 1683 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); 1684 if (!xfs_trans_zone) 1685 goto out_destroy_ifork_zone; 1686 1687 xfs_log_item_desc_zone = 1688 kmem_zone_init(sizeof(struct xfs_log_item_desc), 1689 "xfs_log_item_desc"); 1690 if (!xfs_log_item_desc_zone) 1691 goto out_destroy_trans_zone; 1692 1693 /* 1694 * The size of the zone allocated buf log item is the maximum 1695 * size possible under XFS. This wastes a little bit of memory, 1696 * but it is much faster. 1697 */ 1698 xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item), 1699 "xfs_buf_item"); 1700 if (!xfs_buf_item_zone) 1701 goto out_destroy_log_item_desc_zone; 1702 1703 xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + 1704 ((XFS_EFD_MAX_FAST_EXTENTS - 1) * 1705 sizeof(xfs_extent_t))), "xfs_efd_item"); 1706 if (!xfs_efd_zone) 1707 goto out_destroy_buf_item_zone; 1708 1709 xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + 1710 ((XFS_EFI_MAX_FAST_EXTENTS - 1) * 1711 sizeof(xfs_extent_t))), "xfs_efi_item"); 1712 if (!xfs_efi_zone) 1713 goto out_destroy_efd_zone; 1714 1715 xfs_inode_zone = 1716 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode", 1717 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD, 1718 xfs_fs_inode_init_once); 1719 if (!xfs_inode_zone) 1720 goto out_destroy_efi_zone; 1721 1722 xfs_ili_zone = 1723 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili", 1724 KM_ZONE_SPREAD, NULL); 1725 if (!xfs_ili_zone) 1726 goto out_destroy_inode_zone; 1727 xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item), 1728 "xfs_icr"); 1729 if (!xfs_icreate_zone) 1730 goto out_destroy_ili_zone; 1731 1732 return 0; 1733 1734 out_destroy_ili_zone: 1735 kmem_zone_destroy(xfs_ili_zone); 1736 out_destroy_inode_zone: 1737 kmem_zone_destroy(xfs_inode_zone); 1738 out_destroy_efi_zone: 1739 kmem_zone_destroy(xfs_efi_zone); 1740 out_destroy_efd_zone: 1741 kmem_zone_destroy(xfs_efd_zone); 1742 out_destroy_buf_item_zone: 1743 kmem_zone_destroy(xfs_buf_item_zone); 1744 out_destroy_log_item_desc_zone: 1745 kmem_zone_destroy(xfs_log_item_desc_zone); 1746 out_destroy_trans_zone: 1747 kmem_zone_destroy(xfs_trans_zone); 1748 out_destroy_ifork_zone: 1749 kmem_zone_destroy(xfs_ifork_zone); 1750 out_destroy_da_state_zone: 1751 kmem_zone_destroy(xfs_da_state_zone); 1752 out_destroy_btree_cur_zone: 1753 kmem_zone_destroy(xfs_btree_cur_zone); 1754 out_destroy_bmap_free_item_zone: 1755 kmem_zone_destroy(xfs_bmap_free_item_zone); 1756 out_destroy_log_ticket_zone: 1757 kmem_zone_destroy(xfs_log_ticket_zone); 1758 out_destroy_ioend_pool: 1759 mempool_destroy(xfs_ioend_pool); 1760 out_destroy_ioend_zone: 1761 kmem_zone_destroy(xfs_ioend_zone); 1762 out: 1763 return -ENOMEM; 1764 } 1765 1766 STATIC void 1767 xfs_destroy_zones(void) 1768 { 1769 /* 1770 * Make sure all delayed rcu free are flushed before we 1771 * destroy caches. 1772 */ 1773 rcu_barrier(); 1774 kmem_zone_destroy(xfs_icreate_zone); 1775 kmem_zone_destroy(xfs_ili_zone); 1776 kmem_zone_destroy(xfs_inode_zone); 1777 kmem_zone_destroy(xfs_efi_zone); 1778 kmem_zone_destroy(xfs_efd_zone); 1779 kmem_zone_destroy(xfs_buf_item_zone); 1780 kmem_zone_destroy(xfs_log_item_desc_zone); 1781 kmem_zone_destroy(xfs_trans_zone); 1782 kmem_zone_destroy(xfs_ifork_zone); 1783 kmem_zone_destroy(xfs_da_state_zone); 1784 kmem_zone_destroy(xfs_btree_cur_zone); 1785 kmem_zone_destroy(xfs_bmap_free_item_zone); 1786 kmem_zone_destroy(xfs_log_ticket_zone); 1787 mempool_destroy(xfs_ioend_pool); 1788 kmem_zone_destroy(xfs_ioend_zone); 1789 1790 } 1791 1792 STATIC int __init 1793 xfs_init_workqueues(void) 1794 { 1795 /* 1796 * The allocation workqueue can be used in memory reclaim situations 1797 * (writepage path), and parallelism is only limited by the number of 1798 * AGs in all the filesystems mounted. Hence use the default large 1799 * max_active value for this workqueue. 1800 */ 1801 xfs_alloc_wq = alloc_workqueue("xfsalloc", 1802 WQ_MEM_RECLAIM|WQ_FREEZABLE, 0); 1803 if (!xfs_alloc_wq) 1804 return -ENOMEM; 1805 1806 return 0; 1807 } 1808 1809 STATIC void 1810 xfs_destroy_workqueues(void) 1811 { 1812 destroy_workqueue(xfs_alloc_wq); 1813 } 1814 1815 STATIC int __init 1816 init_xfs_fs(void) 1817 { 1818 int error; 1819 1820 printk(KERN_INFO XFS_VERSION_STRING " with " 1821 XFS_BUILD_OPTIONS " enabled\n"); 1822 1823 xfs_dir_startup(); 1824 1825 error = xfs_init_zones(); 1826 if (error) 1827 goto out; 1828 1829 error = xfs_init_workqueues(); 1830 if (error) 1831 goto out_destroy_zones; 1832 1833 error = xfs_mru_cache_init(); 1834 if (error) 1835 goto out_destroy_wq; 1836 1837 error = xfs_buf_init(); 1838 if (error) 1839 goto out_mru_cache_uninit; 1840 1841 error = xfs_init_procfs(); 1842 if (error) 1843 goto out_buf_terminate; 1844 1845 error = xfs_sysctl_register(); 1846 if (error) 1847 goto out_cleanup_procfs; 1848 1849 xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj); 1850 if (!xfs_kset) { 1851 error = -ENOMEM; 1852 goto out_sysctl_unregister; 1853 } 1854 1855 xfsstats.xs_kobj.kobject.kset = xfs_kset; 1856 1857 xfsstats.xs_stats = alloc_percpu(struct xfsstats); 1858 if (!xfsstats.xs_stats) { 1859 error = -ENOMEM; 1860 goto out_kset_unregister; 1861 } 1862 1863 error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL, 1864 "stats"); 1865 if (error) 1866 goto out_free_stats; 1867 1868 #ifdef DEBUG 1869 xfs_dbg_kobj.kobject.kset = xfs_kset; 1870 error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug"); 1871 if (error) 1872 goto out_remove_stats_kobj; 1873 #endif 1874 1875 error = xfs_qm_init(); 1876 if (error) 1877 goto out_remove_dbg_kobj; 1878 1879 error = register_filesystem(&xfs_fs_type); 1880 if (error) 1881 goto out_qm_exit; 1882 return 0; 1883 1884 out_qm_exit: 1885 xfs_qm_exit(); 1886 out_remove_dbg_kobj: 1887 #ifdef DEBUG 1888 xfs_sysfs_del(&xfs_dbg_kobj); 1889 out_remove_stats_kobj: 1890 #endif 1891 xfs_sysfs_del(&xfsstats.xs_kobj); 1892 out_free_stats: 1893 free_percpu(xfsstats.xs_stats); 1894 out_kset_unregister: 1895 kset_unregister(xfs_kset); 1896 out_sysctl_unregister: 1897 xfs_sysctl_unregister(); 1898 out_cleanup_procfs: 1899 xfs_cleanup_procfs(); 1900 out_buf_terminate: 1901 xfs_buf_terminate(); 1902 out_mru_cache_uninit: 1903 xfs_mru_cache_uninit(); 1904 out_destroy_wq: 1905 xfs_destroy_workqueues(); 1906 out_destroy_zones: 1907 xfs_destroy_zones(); 1908 out: 1909 return error; 1910 } 1911 1912 STATIC void __exit 1913 exit_xfs_fs(void) 1914 { 1915 xfs_qm_exit(); 1916 unregister_filesystem(&xfs_fs_type); 1917 #ifdef DEBUG 1918 xfs_sysfs_del(&xfs_dbg_kobj); 1919 #endif 1920 xfs_sysfs_del(&xfsstats.xs_kobj); 1921 free_percpu(xfsstats.xs_stats); 1922 kset_unregister(xfs_kset); 1923 xfs_sysctl_unregister(); 1924 xfs_cleanup_procfs(); 1925 xfs_buf_terminate(); 1926 xfs_mru_cache_uninit(); 1927 xfs_destroy_workqueues(); 1928 xfs_destroy_zones(); 1929 xfs_uuid_table_free(); 1930 } 1931 1932 module_init(init_xfs_fs); 1933 module_exit(exit_xfs_fs); 1934 1935 MODULE_AUTHOR("Silicon Graphics, Inc."); 1936 MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled"); 1937 MODULE_LICENSE("GPL"); 1938