fs/xfs/xfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000-2005 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 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_da_btree.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_alloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_inode_item.h"
  39 #include "xfs_btree.h"
  40 #include "xfs_alloc.h"
  41 #include "xfs_ialloc.h"
  42 #include "xfs_quota.h"
  43 #include "xfs_error.h"
  44 #include "xfs_bmap.h"
  45 #include "xfs_rw.h"
  46 #include "xfs_refcache.h"
  47 #include "xfs_buf_item.h"
  48 #include "xfs_log_priv.h"
  49 #include "xfs_dir2_trace.h"
  50 #include "xfs_extfree_item.h"
  51 #include "xfs_acl.h"
  52 #include "xfs_attr.h"
  53 #include "xfs_clnt.h"
  54 #include "xfs_mru_cache.h"
  55 #include "xfs_filestream.h"
  56 #include "xfs_fsops.h"
  57 #include "xfs_vnodeops.h"
  58
  59
  60 STATIC int      xfs_sync(bhv_desc_t *, int, cred_t *);
  61
  62 int
  63 xfs_init(void)
  64 {
  65         extern kmem_zone_t      *xfs_bmap_free_item_zone;
  66         extern kmem_zone_t      *xfs_btree_cur_zone;
  67         extern kmem_zone_t      *xfs_trans_zone;
  68         extern kmem_zone_t      *xfs_buf_item_zone;
  69         extern kmem_zone_t      *xfs_dabuf_zone;
  70 #ifdef XFS_DABUF_DEBUG
  71         extern lock_t           xfs_dabuf_global_lock;
  72         spinlock_init(&xfs_dabuf_global_lock, "xfsda");
  73 #endif
  74
  75         /*
  76          * Initialize all of the zone allocators we use.
  77          */
  78         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
  79                                                  "xfs_bmap_free_item");
  80         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
  81                                             "xfs_btree_cur");
  82         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
  83         xfs_da_state_zone =
  84                 kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
  85         xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
  86         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
  87         xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
  88         xfs_mru_cache_init();
  89         xfs_filestream_init();
  90
  91         /*
  92          * The size of the zone allocated buf log item is the maximum
  93          * size possible under XFS.  This wastes a little bit of memory,
  94          * but it is much faster.
  95          */
  96         xfs_buf_item_zone =
  97                 kmem_zone_init((sizeof(xfs_buf_log_item_t) +
  98                                 (((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
  99                                   NBWORD) * sizeof(int))),
 100                                "xfs_buf_item");
 101         xfs_efd_zone =
 102                 kmem_zone_init((sizeof(xfs_efd_log_item_t) +
 103                                ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
 104                                  sizeof(xfs_extent_t))),
 105                                       "xfs_efd_item");
 106         xfs_efi_zone =
 107                 kmem_zone_init((sizeof(xfs_efi_log_item_t) +
 108                                ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
 109                                  sizeof(xfs_extent_t))),
 110                                       "xfs_efi_item");
 111
 112         /*
 113          * These zones warrant special memory allocator hints
 114          */
 115         xfs_inode_zone =
 116                 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
 117                                         KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
 118                                         KM_ZONE_SPREAD, NULL);
 119         xfs_ili_zone =
 120                 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
 121                                         KM_ZONE_SPREAD, NULL);
 122         xfs_icluster_zone =
 123                 kmem_zone_init_flags(sizeof(xfs_icluster_t), "xfs_icluster",
 124                                         KM_ZONE_SPREAD, NULL);
 125
 126         /*
 127          * Allocate global trace buffers.
 128          */
 129 #ifdef XFS_ALLOC_TRACE
 130         xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
 131 #endif
 132 #ifdef XFS_BMAP_TRACE
 133         xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
 134 #endif
 135 #ifdef XFS_BMBT_TRACE
 136         xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
 137 #endif
 138 #ifdef XFS_ATTR_TRACE
 139         xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP);
 140 #endif
 141 #ifdef XFS_DIR2_TRACE
 142         xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP);
 143 #endif
 144
 145         xfs_dir_startup();
 146
 147 #if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
 148         xfs_error_test_init();
 149 #endif /* DEBUG || INDUCE_IO_ERROR */
 150
 151         xfs_init_procfs();
 152         xfs_sysctl_register();
 153         return 0;
 154 }
 155
 156 void
 157 xfs_cleanup(void)
 158 {
 159         extern kmem_zone_t      *xfs_bmap_free_item_zone;
 160         extern kmem_zone_t      *xfs_btree_cur_zone;
 161         extern kmem_zone_t      *xfs_inode_zone;
 162         extern kmem_zone_t      *xfs_trans_zone;
 163         extern kmem_zone_t      *xfs_da_state_zone;
 164         extern kmem_zone_t      *xfs_dabuf_zone;
 165         extern kmem_zone_t      *xfs_efd_zone;
 166         extern kmem_zone_t      *xfs_efi_zone;
 167         extern kmem_zone_t      *xfs_buf_item_zone;
 168         extern kmem_zone_t      *xfs_icluster_zone;
 169
 170         xfs_cleanup_procfs();
 171         xfs_sysctl_unregister();
 172         xfs_refcache_destroy();
 173         xfs_filestream_uninit();
 174         xfs_mru_cache_uninit();
 175         xfs_acl_zone_destroy(xfs_acl_zone);
 176
 177 #ifdef XFS_DIR2_TRACE
 178         ktrace_free(xfs_dir2_trace_buf);
 179 #endif
 180 #ifdef XFS_ATTR_TRACE
 181         ktrace_free(xfs_attr_trace_buf);
 182 #endif
 183 #ifdef XFS_BMBT_TRACE
 184         ktrace_free(xfs_bmbt_trace_buf);
 185 #endif
 186 #ifdef XFS_BMAP_TRACE
 187         ktrace_free(xfs_bmap_trace_buf);
 188 #endif
 189 #ifdef XFS_ALLOC_TRACE
 190         ktrace_free(xfs_alloc_trace_buf);
 191 #endif
 192
 193         kmem_zone_destroy(xfs_bmap_free_item_zone);
 194         kmem_zone_destroy(xfs_btree_cur_zone);
 195         kmem_zone_destroy(xfs_inode_zone);
 196         kmem_zone_destroy(xfs_trans_zone);
 197         kmem_zone_destroy(xfs_da_state_zone);
 198         kmem_zone_destroy(xfs_dabuf_zone);
 199         kmem_zone_destroy(xfs_buf_item_zone);
 200         kmem_zone_destroy(xfs_efd_zone);
 201         kmem_zone_destroy(xfs_efi_zone);
 202         kmem_zone_destroy(xfs_ifork_zone);
 203         kmem_zone_destroy(xfs_ili_zone);
 204         kmem_zone_destroy(xfs_icluster_zone);
 205 }
 206
 207 /*
 208  * xfs_start_flags
 209  *
 210  * This function fills in xfs_mount_t fields based on mount args.
 211  * Note: the superblock has _not_ yet been read in.
 212  */
 213 STATIC int
 214 xfs_start_flags(
 215         struct bhv_vfs          *vfs,
 216         struct xfs_mount_args   *ap,
 217         struct xfs_mount        *mp)
 218 {
 219         /* Values are in BBs */
 220         if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
 221                 /*
 222                  * At this point the superblock has not been read
 223                  * in, therefore we do not know the block size.
 224                  * Before the mount call ends we will convert
 225                  * these to FSBs.
 226                  */
 227                 mp->m_dalign = ap->sunit;
 228                 mp->m_swidth = ap->swidth;
 229         }
 230
 231         if (ap->logbufs != -1 &&
 232             ap->logbufs != 0 &&
 233             (ap->logbufs < XLOG_MIN_ICLOGS ||
 234              ap->logbufs > XLOG_MAX_ICLOGS)) {
 235                 cmn_err(CE_WARN,
 236                         "XFS: invalid logbufs value: %d [not %d-%d]",
 237                         ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 238                 return XFS_ERROR(EINVAL);
 239         }
 240         mp->m_logbufs = ap->logbufs;
 241         if (ap->logbufsize != -1 &&
 242             ap->logbufsize !=  0 &&
 243             (ap->logbufsize < XLOG_MIN_RECORD_BSIZE ||
 244              ap->logbufsize > XLOG_MAX_RECORD_BSIZE ||
 245              !is_power_of_2(ap->logbufsize))) {
 246                 cmn_err(CE_WARN,
 247         "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 248                         ap->logbufsize);
 249                 return XFS_ERROR(EINVAL);
 250         }
 251         mp->m_logbsize = ap->logbufsize;
 252         mp->m_fsname_len = strlen(ap->fsname) + 1;
 253         mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
 254         strcpy(mp->m_fsname, ap->fsname);
 255         if (ap->rtname[0]) {
 256                 mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
 257                 strcpy(mp->m_rtname, ap->rtname);
 258         }
 259         if (ap->logname[0]) {
 260                 mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
 261                 strcpy(mp->m_logname, ap->logname);
 262         }
 263
 264         if (ap->flags & XFSMNT_WSYNC)
 265                 mp->m_flags |= XFS_MOUNT_WSYNC;
 266 #if XFS_BIG_INUMS
 267         if (ap->flags & XFSMNT_INO64) {
 268                 mp->m_flags |= XFS_MOUNT_INO64;
 269                 mp->m_inoadd = XFS_INO64_OFFSET;
 270         }
 271 #endif
 272         if (ap->flags & XFSMNT_RETERR)
 273                 mp->m_flags |= XFS_MOUNT_RETERR;
 274         if (ap->flags & XFSMNT_NOALIGN)
 275                 mp->m_flags |= XFS_MOUNT_NOALIGN;
 276         if (ap->flags & XFSMNT_SWALLOC)
 277                 mp->m_flags |= XFS_MOUNT_SWALLOC;
 278         if (ap->flags & XFSMNT_OSYNCISOSYNC)
 279                 mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
 280         if (ap->flags & XFSMNT_32BITINODES)
 281                 mp->m_flags |= XFS_MOUNT_32BITINODES;
 282
 283         if (ap->flags & XFSMNT_IOSIZE) {
 284                 if (ap->iosizelog > XFS_MAX_IO_LOG ||
 285                     ap->iosizelog < XFS_MIN_IO_LOG) {
 286                         cmn_err(CE_WARN,
 287                 "XFS: invalid log iosize: %d [not %d-%d]",
 288                                 ap->iosizelog, XFS_MIN_IO_LOG,
 289                                 XFS_MAX_IO_LOG);
 290                         return XFS_ERROR(EINVAL);
 291                 }
 292
 293                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 294                 mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
 295         }
 296
 297         if (ap->flags & XFSMNT_IDELETE)
 298                 mp->m_flags |= XFS_MOUNT_IDELETE;
 299         if (ap->flags & XFSMNT_DIRSYNC)
 300                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 301         if (ap->flags & XFSMNT_ATTR2)
 302                 mp->m_flags |= XFS_MOUNT_ATTR2;
 303
 304         if (ap->flags2 & XFSMNT2_COMPAT_IOSIZE)
 305                 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
 306
 307         /*
 308          * no recovery flag requires a read-only mount
 309          */
 310         if (ap->flags & XFSMNT_NORECOVERY) {
 311                 if (!(vfs->vfs_flag & VFS_RDONLY)) {
 312                         cmn_err(CE_WARN,
 313         "XFS: tried to mount a FS read-write without recovery!");
 314                         return XFS_ERROR(EINVAL);
 315                 }
 316                 mp->m_flags |= XFS_MOUNT_NORECOVERY;
 317         }
 318
 319         if (ap->flags & XFSMNT_NOUUID)
 320                 mp->m_flags |= XFS_MOUNT_NOUUID;
 321         if (ap->flags & XFSMNT_BARRIER)
 322                 mp->m_flags |= XFS_MOUNT_BARRIER;
 323         else
 324                 mp->m_flags &= ~XFS_MOUNT_BARRIER;
 325
 326         if (ap->flags2 & XFSMNT2_FILESTREAMS)
 327                 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
 328
 329         return 0;
 330 }
 331
 332 /*
 333  * This function fills in xfs_mount_t fields based on mount args.
 334  * Note: the superblock _has_ now been read in.
 335  */
 336 STATIC int
 337 xfs_finish_flags(
 338         struct bhv_vfs          *vfs,
 339         struct xfs_mount_args   *ap,
 340         struct xfs_mount        *mp)
 341 {
 342         int                     ronly = (vfs->vfs_flag & VFS_RDONLY);
 343
 344         /* Fail a mount where the logbuf is smaller then the log stripe */
 345         if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
 346                 if ((ap->logbufsize <= 0) &&
 347                     (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
 348                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 349                 } else if (ap->logbufsize > 0 &&
 350                            ap->logbufsize < mp->m_sb.sb_logsunit) {
 351                         cmn_err(CE_WARN,
 352         "XFS: logbuf size must be greater than or equal to log stripe size");
 353                         return XFS_ERROR(EINVAL);
 354                 }
 355         } else {
 356                 /* Fail a mount if the logbuf is larger than 32K */
 357                 if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
 358                         cmn_err(CE_WARN,
 359         "XFS: logbuf size for version 1 logs must be 16K or 32K");
 360                         return XFS_ERROR(EINVAL);
 361                 }
 362         }
 363
 364         if (XFS_SB_VERSION_HASATTR2(&mp->m_sb)) {
 365                 mp->m_flags |= XFS_MOUNT_ATTR2;
 366         }
 367
 368         /*
 369          * prohibit r/w mounts of read-only filesystems
 370          */
 371         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 372                 cmn_err(CE_WARN,
 373         "XFS: cannot mount a read-only filesystem as read-write");
 374                 return XFS_ERROR(EROFS);
 375         }
 376
 377         /*
 378          * check for shared mount.
 379          */
 380         if (ap->flags & XFSMNT_SHARED) {
 381                 if (!XFS_SB_VERSION_HASSHARED(&mp->m_sb))
 382                         return XFS_ERROR(EINVAL);
 383
 384                 /*
 385                  * For IRIX 6.5, shared mounts must have the shared
 386                  * version bit set, have the persistent readonly
 387                  * field set, must be version 0 and can only be mounted
 388                  * read-only.
 389                  */
 390                 if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
 391                      (mp->m_sb.sb_shared_vn != 0))
 392                         return XFS_ERROR(EINVAL);
 393
 394                 mp->m_flags |= XFS_MOUNT_SHARED;
 395
 396                 /*
 397                  * Shared XFS V0 can't deal with DMI.  Return EINVAL.
 398                  */
 399                 if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
 400                         return XFS_ERROR(EINVAL);
 401         }
 402
 403         return 0;
 404 }
 405
 406 /*
 407  * xfs_mount
 408  *
 409  * The file system configurations are:
 410  *      (1) device (partition) with data and internal log
 411  *      (2) logical volume with data and log subvolumes.
 412  *      (3) logical volume with data, log, and realtime subvolumes.
 413  *
 414  * We only have to handle opening the log and realtime volumes here if
 415  * they are present.  The data subvolume has already been opened by
 416  * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
 417  */
 418 STATIC int
 419 xfs_mount(
 420         struct bhv_desc         *bhvp,
 421         struct xfs_mount_args   *args,
 422         cred_t                  *credp)
 423 {
 424         struct bhv_vfs          *vfsp = bhvtovfs(bhvp);
 425         struct bhv_desc         *p;
 426         struct xfs_mount        *mp = XFS_BHVTOM(bhvp);
 427         struct block_device     *ddev, *logdev, *rtdev;
 428         int                     flags = 0, error;
 429
 430         ddev = vfsp->vfs_super->s_bdev;
 431         logdev = rtdev = NULL;
 432
 433         /*
 434          * Setup xfs_mount function vectors from available behaviors
 435          */
 436         p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
 437         mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
 438         p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
 439         mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
 440         p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
 441         mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs;
 442
 443         if (args->flags & XFSMNT_QUIET)
 444                 flags |= XFS_MFSI_QUIET;
 445
 446         /*
 447          * Open real time and log devices - order is important.
 448          */
 449         if (args->logname[0]) {
 450                 error = xfs_blkdev_get(mp, args->logname, &logdev);
 451                 if (error)
 452                         return error;
 453         }
 454         if (args->rtname[0]) {
 455                 error = xfs_blkdev_get(mp, args->rtname, &rtdev);
 456                 if (error) {
 457                         xfs_blkdev_put(logdev);
 458                         return error;
 459                 }
 460
 461                 if (rtdev == ddev || rtdev == logdev) {
 462                         cmn_err(CE_WARN,
 463         "XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
 464                         xfs_blkdev_put(logdev);
 465                         xfs_blkdev_put(rtdev);
 466                         return EINVAL;
 467                 }
 468         }
 469
 470         /*
 471          * Setup xfs_mount buffer target pointers
 472          */
 473         error = ENOMEM;
 474         mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0);
 475         if (!mp->m_ddev_targp) {
 476                 xfs_blkdev_put(logdev);
 477                 xfs_blkdev_put(rtdev);
 478                 return error;
 479         }
 480         if (rtdev) {
 481                 mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
 482                 if (!mp->m_rtdev_targp) {
 483                         xfs_blkdev_put(logdev);
 484                         xfs_blkdev_put(rtdev);
 485                         goto error0;
 486                 }
 487         }
 488         mp->m_logdev_targp = (logdev && logdev != ddev) ?
 489                                 xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
 490         if (!mp->m_logdev_targp) {
 491                 xfs_blkdev_put(logdev);
 492                 xfs_blkdev_put(rtdev);
 493                 goto error0;
 494         }
 495
 496         /*
 497          * Setup flags based on mount(2) options and then the superblock
 498          */
 499         error = xfs_start_flags(vfsp, args, mp);
 500         if (error)
 501                 goto error1;
 502         error = xfs_readsb(mp, flags);
 503         if (error)
 504                 goto error1;
 505         error = xfs_finish_flags(vfsp, args, mp);
 506         if (error)
 507                 goto error2;
 508
 509         /*
 510          * Setup xfs_mount buffer target pointers based on superblock
 511          */
 512         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
 513                                     mp->m_sb.sb_sectsize);
 514         if (!error && logdev && logdev != ddev) {
 515                 unsigned int    log_sector_size = BBSIZE;
 516
 517                 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb))
 518                         log_sector_size = mp->m_sb.sb_logsectsize;
 519                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 520                                             mp->m_sb.sb_blocksize,
 521                                             log_sector_size);
 522         }
 523         if (!error && rtdev)
 524                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 525                                             mp->m_sb.sb_blocksize,
 526                                             mp->m_sb.sb_sectsize);
 527         if (error)
 528                 goto error2;
 529
 530         if (mp->m_flags & XFS_MOUNT_BARRIER)
 531                 xfs_mountfs_check_barriers(mp);
 532
 533         if ((error = xfs_filestream_mount(mp)))
 534                 goto error2;
 535
 536         error = XFS_IOINIT(vfsp, args, flags);
 537         if (error)
 538                 goto error2;
 539
 540         return 0;
 541
 542 error2:
 543         if (mp->m_sb_bp)
 544                 xfs_freesb(mp);
 545 error1:
 546         xfs_binval(mp->m_ddev_targp);
 547         if (logdev && logdev != ddev)
 548                 xfs_binval(mp->m_logdev_targp);
 549         if (rtdev)
 550                 xfs_binval(mp->m_rtdev_targp);
 551 error0:
 552         xfs_unmountfs_close(mp, credp);
 553         return error;
 554 }
 555
 556 STATIC int
 557 xfs_unmount(
 558         bhv_desc_t      *bdp,
 559         int             flags,
 560         cred_t          *credp)
 561 {
 562         bhv_vfs_t       *vfsp = bhvtovfs(bdp);
 563         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 564         xfs_inode_t     *rip;
 565         bhv_vnode_t     *rvp;
 566         int             unmount_event_wanted = 0;
 567         int             unmount_event_flags = 0;
 568         int             xfs_unmountfs_needed = 0;
 569         int             error;
 570
 571         rip = mp->m_rootip;
 572         rvp = XFS_ITOV(rip);
 573
 574 #ifdef HAVE_DMAPI
 575         if (vfsp->vfs_flag & VFS_DMI) {
 576                 error = XFS_SEND_PREUNMOUNT(mp, vfsp,
 577                                 rvp, DM_RIGHT_NULL, rvp, DM_RIGHT_NULL,
 578                                 NULL, NULL, 0, 0,
 579                                 (mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))?
 580                                         0:DM_FLAGS_UNWANTED);
 581                         if (error)
 582                                 return XFS_ERROR(error);
 583                 unmount_event_wanted = 1;
 584                 unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))?
 585                                         0 : DM_FLAGS_UNWANTED;
 586         }
 587 #endif
 588         /*
 589          * First blow any referenced inode from this file system
 590          * out of the reference cache, and delete the timer.
 591          */
 592         xfs_refcache_purge_mp(mp);
 593
 594         /*
 595          * Blow away any referenced inode in the filestreams cache.
 596          * This can and will cause log traffic as inodes go inactive
 597          * here.
 598          */
 599         xfs_filestream_unmount(mp);
 600
 601         XFS_bflush(mp->m_ddev_targp);
 602         error = xfs_unmount_flush(mp, 0);
 603         if (error)
 604                 goto out;
 605
 606         ASSERT(vn_count(rvp) == 1);
 607
 608         /*
 609          * Drop the reference count
 610          */
 611         VN_RELE(rvp);
 612
 613         /*
 614          * If we're forcing a shutdown, typically because of a media error,
 615          * we want to make sure we invalidate dirty pages that belong to
 616          * referenced vnodes as well.
 617          */
 618         if (XFS_FORCED_SHUTDOWN(mp)) {
 619                 error = xfs_sync(&mp->m_bhv,
 620                          (SYNC_WAIT | SYNC_CLOSE), credp);
 621                 ASSERT(error != EFSCORRUPTED);
 622         }
 623         xfs_unmountfs_needed = 1;
 624
 625 out:
 626         /*      Send DMAPI event, if required.
 627          *      Then do xfs_unmountfs() if needed.
 628          *      Then return error (or zero).
 629          */
 630         if (unmount_event_wanted) {
 631                 /* Note: mp structure must still exist for
 632                  * XFS_SEND_UNMOUNT() call.
 633                  */
 634                 XFS_SEND_UNMOUNT(mp, vfsp, error == 0 ? rvp : NULL,
 635                         DM_RIGHT_NULL, 0, error, unmount_event_flags);
 636         }
 637         if (xfs_unmountfs_needed) {
 638                 /*
 639                  * Call common unmount function to flush to disk
 640                  * and free the super block buffer & mount structures.
 641                  */
 642                 xfs_unmountfs(mp, credp);
 643         }
 644
 645         return XFS_ERROR(error);
 646 }
 647
 648 STATIC int
 649 xfs_quiesce_fs(
 650         xfs_mount_t             *mp)
 651 {
 652         int                     count = 0, pincount;
 653
 654         xfs_refcache_purge_mp(mp);
 655         xfs_flush_buftarg(mp->m_ddev_targp, 0);
 656         xfs_finish_reclaim_all(mp, 0);
 657
 658         /* This loop must run at least twice.
 659          * The first instance of the loop will flush
 660          * most meta data but that will generate more
 661          * meta data (typically directory updates).
 662          * Which then must be flushed and logged before
 663          * we can write the unmount record.
 664          */
 665         do {
 666                 xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
 667                 pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
 668                 if (!pincount) {
 669                         delay(50);
 670                         count++;
 671                 }
 672         } while (count < 2);
 673
 674         return 0;
 675 }
 676
 677 /*
 678  * Second stage of a quiesce. The data is already synced, now we have to take
 679  * care of the metadata. New transactions are already blocked, so we need to
 680  * wait for any remaining transactions to drain out before proceding.
 681  */
 682 STATIC void
 683 xfs_attr_quiesce(
 684         xfs_mount_t     *mp)
 685 {
 686         /* wait for all modifications to complete */
 687         while (atomic_read(&mp->m_active_trans) > 0)
 688                 delay(100);
 689
 690         /* flush inodes and push all remaining buffers out to disk */
 691         xfs_quiesce_fs(mp);
 692
 693         ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
 694
 695         /* Push the superblock and write an unmount record */
 696         xfs_log_sbcount(mp, 1);
 697         xfs_log_unmount_write(mp);
 698         xfs_unmountfs_writesb(mp);
 699 }
 700
 701 STATIC int
 702 xfs_mntupdate(
 703         bhv_desc_t                      *bdp,
 704         int                             *flags,
 705         struct xfs_mount_args           *args)
 706 {
 707         bhv_vfs_t       *vfsp = bhvtovfs(bdp);
 708         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 709
 710         if (!(*flags & MS_RDONLY)) {                    /* rw/ro -> rw */
 711                 if (vfsp->vfs_flag & VFS_RDONLY)
 712                         vfsp->vfs_flag &= ~VFS_RDONLY;
 713                 if (args->flags & XFSMNT_BARRIER) {
 714                         mp->m_flags |= XFS_MOUNT_BARRIER;
 715                         xfs_mountfs_check_barriers(mp);
 716                 } else {
 717                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
 718                 }
 719         } else if (!(vfsp->vfs_flag & VFS_RDONLY)) {    /* rw -> ro */
 720                 xfs_filestream_flush(mp);
 721                 bhv_vfs_sync(vfsp, SYNC_DATA_QUIESCE, NULL);
 722                 xfs_attr_quiesce(mp);
 723                 vfsp->vfs_flag |= VFS_RDONLY;
 724         }
 725         return 0;
 726 }
 727
 728 /*
 729  * xfs_unmount_flush implements a set of flush operation on special
 730  * inodes, which are needed as a separate set of operations so that
 731  * they can be called as part of relocation process.
 732  */
 733 int
 734 xfs_unmount_flush(
 735         xfs_mount_t     *mp,            /* Mount structure we are getting
 736                                            rid of. */
 737         int             relocation)     /* Called from vfs relocation. */
 738 {
 739         xfs_inode_t     *rip = mp->m_rootip;
 740         xfs_inode_t     *rbmip;
 741         xfs_inode_t     *rsumip = NULL;
 742         bhv_vnode_t     *rvp = XFS_ITOV(rip);
 743         int             error;
 744
 745         xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
 746         xfs_iflock(rip);
 747
 748         /*
 749          * Flush out the real time inodes.
 750          */
 751         if ((rbmip = mp->m_rbmip) != NULL) {
 752                 xfs_ilock(rbmip, XFS_ILOCK_EXCL);
 753                 xfs_iflock(rbmip);
 754                 error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
 755                 xfs_iunlock(rbmip, XFS_ILOCK_EXCL);
 756
 757                 if (error == EFSCORRUPTED)
 758                         goto fscorrupt_out;
 759
 760                 ASSERT(vn_count(XFS_ITOV(rbmip)) == 1);
 761
 762                 rsumip = mp->m_rsumip;
 763                 xfs_ilock(rsumip, XFS_ILOCK_EXCL);
 764                 xfs_iflock(rsumip);
 765                 error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
 766                 xfs_iunlock(rsumip, XFS_ILOCK_EXCL);
 767
 768                 if (error == EFSCORRUPTED)
 769                         goto fscorrupt_out;
 770
 771                 ASSERT(vn_count(XFS_ITOV(rsumip)) == 1);
 772         }
 773
 774         /*
 775          * Synchronously flush root inode to disk
 776          */
 777         error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
 778         if (error == EFSCORRUPTED)
 779                 goto fscorrupt_out2;
 780
 781         if (vn_count(rvp) != 1 && !relocation) {
 782                 xfs_iunlock(rip, XFS_ILOCK_EXCL);
 783                 return XFS_ERROR(EBUSY);
 784         }
 785
 786         /*
 787          * Release dquot that rootinode, rbmino and rsumino might be holding,
 788          * flush and purge the quota inodes.
 789          */
 790         error = XFS_QM_UNMOUNT(mp);
 791         if (error == EFSCORRUPTED)
 792                 goto fscorrupt_out2;
 793
 794         if (rbmip) {
 795                 VN_RELE(XFS_ITOV(rbmip));
 796                 VN_RELE(XFS_ITOV(rsumip));
 797         }
 798
 799         xfs_iunlock(rip, XFS_ILOCK_EXCL);
 800         return 0;
 801
 802 fscorrupt_out:
 803         xfs_ifunlock(rip);
 804
 805 fscorrupt_out2:
 806         xfs_iunlock(rip, XFS_ILOCK_EXCL);
 807
 808         return XFS_ERROR(EFSCORRUPTED);
 809 }
 810
 811 /*
 812  * xfs_root extracts the root vnode from a vfs.
 813  *
 814  * vfsp -- the vfs struct for the desired file system
 815  * vpp  -- address of the caller's vnode pointer which should be
 816  *         set to the desired fs root vnode
 817  */
 818 STATIC int
 819 xfs_root(
 820         bhv_desc_t      *bdp,
 821         bhv_vnode_t     **vpp)
 822 {
 823         bhv_vnode_t     *vp;
 824
 825         vp = XFS_ITOV((XFS_BHVTOM(bdp))->m_rootip);
 826         VN_HOLD(vp);
 827         *vpp = vp;
 828         return 0;
 829 }
 830
 831 /*
 832  * xfs_statvfs
 833  *
 834  * Fill in the statvfs structure for the given file system.  We use
 835  * the superblock lock in the mount structure to ensure a consistent
 836  * snapshot of the counters returned.
 837  */
 838 STATIC int
 839 xfs_statvfs(
 840         bhv_desc_t      *bdp,
 841         bhv_statvfs_t   *statp,
 842         bhv_vnode_t     *vp)
 843 {
 844         __uint64_t      fakeinos;
 845         xfs_extlen_t    lsize;
 846         xfs_mount_t     *mp;
 847         xfs_sb_t        *sbp;
 848         unsigned long   s;
 849
 850         mp = XFS_BHVTOM(bdp);
 851         sbp = &(mp->m_sb);
 852
 853         statp->f_type = XFS_SB_MAGIC;
 854
 855         xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
 856         s = XFS_SB_LOCK(mp);
 857         statp->f_bsize = sbp->sb_blocksize;
 858         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 859         statp->f_blocks = sbp->sb_dblocks - lsize;
 860         statp->f_bfree = statp->f_bavail =
 861                                 sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
 862         fakeinos = statp->f_bfree << sbp->sb_inopblog;
 863 #if XFS_BIG_INUMS
 864         fakeinos += mp->m_inoadd;
 865 #endif
 866         statp->f_files =
 867             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
 868         if (mp->m_maxicount)
 869 #if XFS_BIG_INUMS
 870                 if (!mp->m_inoadd)
 871 #endif
 872                         statp->f_files = min_t(typeof(statp->f_files),
 873                                                 statp->f_files,
 874                                                 mp->m_maxicount);
 875         statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
 876         XFS_SB_UNLOCK(mp, s);
 877
 878         xfs_statvfs_fsid(statp, mp);
 879         statp->f_namelen = MAXNAMELEN - 1;
 880
 881         return 0;
 882 }
 883
 884
 885 /*
 886  * xfs_sync flushes any pending I/O to file system vfsp.
 887  *
 888  * This routine is called by vfs_sync() to make sure that things make it
 889  * out to disk eventually, on sync() system calls to flush out everything,
 890  * and when the file system is unmounted.  For the vfs_sync() case, all
 891  * we really need to do is sync out the log to make all of our meta-data
 892  * updates permanent (except for timestamps).  For calls from pflushd(),
 893  * dirty pages are kept moving by calling pdflush() on the inodes
 894  * containing them.  We also flush the inodes that we can lock without
 895  * sleeping and the superblock if we can lock it without sleeping from
 896  * vfs_sync() so that items at the tail of the log are always moving out.
 897  *
 898  * Flags:
 899  *      SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
 900  *                     to sleep if we can help it.  All we really need
 901  *                     to do is ensure that the log is synced at least
 902  *                     periodically.  We also push the inodes and
 903  *                     superblock if we can lock them without sleeping
 904  *                      and they are not pinned.
 905  *      SYNC_ATTR    - We need to flush the inodes.  If SYNC_BDFLUSH is not
 906  *                     set, then we really want to lock each inode and flush
 907  *                     it.
 908  *      SYNC_WAIT    - All the flushes that take place in this call should
 909  *                     be synchronous.
 910  *      SYNC_DELWRI  - This tells us to push dirty pages associated with
 911  *                     inodes.  SYNC_WAIT and SYNC_BDFLUSH are used to
 912  *                     determine if they should be flushed sync, async, or
 913  *                     delwri.
 914  *      SYNC_CLOSE   - This flag is passed when the system is being
 915  *                     unmounted.  We should sync and invalidate everything.
 916  *      SYNC_FSDATA  - This indicates that the caller would like to make
 917  *                     sure the superblock is safe on disk.  We can ensure
 918  *                     this by simply making sure the log gets flushed
 919  *                     if SYNC_BDFLUSH is set, and by actually writing it
 920  *                     out otherwise.
 921  *      SYNC_IOWAIT  - The caller wants us to wait for all data I/O to complete
 922  *                     before we return (including direct I/O). Forms the drain
 923  *                     side of the write barrier needed to safely quiesce the
 924  *                     filesystem.
 925  *
 926  */
 927 /*ARGSUSED*/
 928 STATIC int
 929 xfs_sync(
 930         bhv_desc_t      *bdp,
 931         int             flags,
 932         cred_t          *credp)
 933 {
 934         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 935
 936         if (flags & SYNC_IOWAIT)
 937                 xfs_filestream_flush(mp);
 938
 939         return xfs_syncsub(mp, flags, NULL);
 940 }
 941
 942 /*
 943  * xfs sync routine for internal use
 944  *
 945  * This routine supports all of the flags defined for the generic vfs_sync
 946  * interface as explained above under xfs_sync.
 947  *
 948  */
 949 int
 950 xfs_sync_inodes(
 951         xfs_mount_t     *mp,
 952         int             flags,
 953         int             *bypassed)
 954 {
 955         xfs_inode_t     *ip = NULL;
 956         xfs_inode_t     *ip_next;
 957         xfs_buf_t       *bp;
 958         bhv_vnode_t     *vp = NULL;
 959         int             error;
 960         int             last_error;
 961         uint64_t        fflag;
 962         uint            lock_flags;
 963         uint            base_lock_flags;
 964         boolean_t       mount_locked;
 965         boolean_t       vnode_refed;
 966         int             preempt;
 967         xfs_dinode_t    *dip;
 968         xfs_iptr_t      *ipointer;
 969 #ifdef DEBUG
 970         boolean_t       ipointer_in = B_FALSE;
 971
 972 #define IPOINTER_SET    ipointer_in = B_TRUE
 973 #define IPOINTER_CLR    ipointer_in = B_FALSE
 974 #else
 975 #define IPOINTER_SET
 976 #define IPOINTER_CLR
 977 #endif
 978
 979
 980 /* Insert a marker record into the inode list after inode ip. The list
 981  * must be locked when this is called. After the call the list will no
 982  * longer be locked.
 983  */
 984 #define IPOINTER_INSERT(ip, mp) { \
 985                 ASSERT(ipointer_in == B_FALSE); \
 986                 ipointer->ip_mnext = ip->i_mnext; \
 987                 ipointer->ip_mprev = ip; \
 988                 ip->i_mnext = (xfs_inode_t *)ipointer; \
 989                 ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
 990                 preempt = 0; \
 991                 XFS_MOUNT_IUNLOCK(mp); \
 992                 mount_locked = B_FALSE; \
 993                 IPOINTER_SET; \
 994         }
 995
 996 /* Remove the marker from the inode list. If the marker was the only item
 997  * in the list then there are no remaining inodes and we should zero out
 998  * the whole list. If we are the current head of the list then move the head
 999  * past us.
1000  */
1001 #define IPOINTER_REMOVE(ip, mp) { \
1002                 ASSERT(ipointer_in == B_TRUE); \
1003                 if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
1004                         ip = ipointer->ip_mnext; \
1005                         ip->i_mprev = ipointer->ip_mprev; \
1006                         ipointer->ip_mprev->i_mnext = ip; \
1007                         if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
1008                                 mp->m_inodes = ip; \
1009                         } \
1010                 } else { \
1011                         ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
1012                         mp->m_inodes = NULL; \
1013                         ip = NULL; \
1014                 } \
1015                 IPOINTER_CLR; \
1016         }
1017
1018 #define XFS_PREEMPT_MASK        0x7f
1019
1020         if (bypassed)
1021                 *bypassed = 0;
1022         if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
1023                 return 0;
1024         error = 0;
1025         last_error = 0;
1026         preempt = 0;
1027
1028         /* Allocate a reference marker */
1029         ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
1030
1031         fflag = XFS_B_ASYNC;            /* default is don't wait */
1032         if (flags & (SYNC_BDFLUSH | SYNC_DELWRI))
1033                 fflag = XFS_B_DELWRI;
1034         if (flags & SYNC_WAIT)
1035                 fflag = 0;              /* synchronous overrides all */
1036
1037         base_lock_flags = XFS_ILOCK_SHARED;
1038         if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
1039                 /*
1040                  * We need the I/O lock if we're going to call any of
1041                  * the flush/inval routines.
1042                  */
1043                 base_lock_flags |= XFS_IOLOCK_SHARED;
1044         }
1045
1046         XFS_MOUNT_ILOCK(mp);
1047
1048         ip = mp->m_inodes;
1049
1050         mount_locked = B_TRUE;
1051         vnode_refed  = B_FALSE;
1052
1053         IPOINTER_CLR;
1054
1055         do {
1056                 ASSERT(ipointer_in == B_FALSE);
1057                 ASSERT(vnode_refed == B_FALSE);
1058
1059                 lock_flags = base_lock_flags;
1060
1061                 /*
1062                  * There were no inodes in the list, just break out
1063                  * of the loop.
1064                  */
1065                 if (ip == NULL) {
1066                         break;
1067                 }
1068
1069                 /*
1070                  * We found another sync thread marker - skip it
1071                  */
1072                 if (ip->i_mount == NULL) {
1073                         ip = ip->i_mnext;
1074                         continue;
1075                 }
1076
1077                 vp = XFS_ITOV_NULL(ip);
1078
1079                 /*
1080                  * If the vnode is gone then this is being torn down,
1081                  * call reclaim if it is flushed, else let regular flush
1082                  * code deal with it later in the loop.
1083                  */
1084
1085                 if (vp == NULL) {
1086                         /* Skip ones already in reclaim */
1087                         if (ip->i_flags & XFS_IRECLAIM) {
1088                                 ip = ip->i_mnext;
1089                                 continue;
1090                         }
1091                         if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
1092                                 ip = ip->i_mnext;
1093                         } else if ((xfs_ipincount(ip) == 0) &&
1094                                     xfs_iflock_nowait(ip)) {
1095                                 IPOINTER_INSERT(ip, mp);
1096
1097                                 xfs_finish_reclaim(ip, 1,
1098                                                 XFS_IFLUSH_DELWRI_ELSE_ASYNC);
1099
1100                                 XFS_MOUNT_ILOCK(mp);
1101                                 mount_locked = B_TRUE;
1102                                 IPOINTER_REMOVE(ip, mp);
1103                         } else {
1104                                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1105                                 ip = ip->i_mnext;
1106                         }
1107                         continue;
1108                 }
1109
1110                 if (VN_BAD(vp)) {
1111                         ip = ip->i_mnext;
1112                         continue;
1113                 }
1114
1115                 if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
1116                         XFS_MOUNT_IUNLOCK(mp);
1117                         kmem_free(ipointer, sizeof(xfs_iptr_t));
1118                         return 0;
1119                 }
1120
1121                 /*
1122                  * If this is just vfs_sync() or pflushd() calling
1123                  * then we can skip inodes for which it looks like
1124                  * there is nothing to do.  Since we don't have the
1125                  * inode locked this is racy, but these are periodic
1126                  * calls so it doesn't matter.  For the others we want
1127                  * to know for sure, so we at least try to lock them.
1128                  */
1129                 if (flags & SYNC_BDFLUSH) {
1130                         if (((ip->i_itemp == NULL) ||
1131                              !(ip->i_itemp->ili_format.ilf_fields &
1132                                XFS_ILOG_ALL)) &&
1133                             (ip->i_update_core == 0)) {
1134                                 ip = ip->i_mnext;
1135                                 continue;
1136                         }
1137                 }
1138
1139                 /*
1140                  * Try to lock without sleeping.  We're out of order with
1141                  * the inode list lock here, so if we fail we need to drop
1142                  * the mount lock and try again.  If we're called from
1143                  * bdflush() here, then don't bother.
1144                  *
1145                  * The inode lock here actually coordinates with the
1146                  * almost spurious inode lock in xfs_ireclaim() to prevent
1147                  * the vnode we handle here without a reference from
1148                  * being freed while we reference it.  If we lock the inode
1149                  * while it's on the mount list here, then the spurious inode
1150                  * lock in xfs_ireclaim() after the inode is pulled from
1151                  * the mount list will sleep until we release it here.
1152                  * This keeps the vnode from being freed while we reference
1153                  * it.
1154                  */
1155                 if (xfs_ilock_nowait(ip, lock_flags) == 0) {
1156                         if ((flags & SYNC_BDFLUSH) || (vp == NULL)) {
1157                                 ip = ip->i_mnext;
1158                                 continue;
1159                         }
1160
1161                         vp = vn_grab(vp);
1162                         if (vp == NULL) {
1163                                 ip = ip->i_mnext;
1164                                 continue;
1165                         }
1166
1167                         IPOINTER_INSERT(ip, mp);
1168                         xfs_ilock(ip, lock_flags);
1169
1170                         ASSERT(vp == XFS_ITOV(ip));
1171                         ASSERT(ip->i_mount == mp);
1172
1173                         vnode_refed = B_TRUE;
1174                 }
1175
1176                 /* From here on in the loop we may have a marker record
1177                  * in the inode list.
1178                  */
1179
1180                 /*
1181                  * If we have to flush data or wait for I/O completion
1182                  * we need to drop the ilock that we currently hold.
1183                  * If we need to drop the lock, insert a marker if we
1184                  * have not already done so.
1185                  */
1186                 if ((flags & (SYNC_CLOSE|SYNC_IOWAIT)) ||
1187                     ((flags & SYNC_DELWRI) && VN_DIRTY(vp))) {
1188                         if (mount_locked) {
1189                                 IPOINTER_INSERT(ip, mp);
1190                         }
1191                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1192
1193                         if (flags & SYNC_CLOSE) {
1194                                 /* Shutdown case. Flush and invalidate. */
1195                                 if (XFS_FORCED_SHUTDOWN(mp))
1196                                         xfs_tosspages(ip, 0, -1,
1197                                                              FI_REMAPF);
1198                                 else
1199                                         error = xfs_flushinval_pages(ip,
1200                                                         0, -1, FI_REMAPF);
1201                         } else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
1202                                 error = xfs_flush_pages(ip, 0,
1203                                                         -1, fflag, FI_NONE);
1204                         }
1205
1206                         /*
1207                          * When freezing, we need to wait ensure all I/O (including direct
1208                          * I/O) is complete to ensure no further data modification can take
1209                          * place after this point
1210                          */
1211                         if (flags & SYNC_IOWAIT)
1212                                 vn_iowait(ip);
1213
1214                         xfs_ilock(ip, XFS_ILOCK_SHARED);
1215                 }
1216
1217                 if (flags & SYNC_BDFLUSH) {
1218                         if ((flags & SYNC_ATTR) &&
1219                             ((ip->i_update_core) ||
1220                              ((ip->i_itemp != NULL) &&
1221                               (ip->i_itemp->ili_format.ilf_fields != 0)))) {
1222
1223                                 /* Insert marker and drop lock if not already
1224                                  * done.
1225                                  */
1226                                 if (mount_locked) {
1227                                         IPOINTER_INSERT(ip, mp);
1228                                 }
1229
1230                                 /*
1231                                  * We don't want the periodic flushing of the
1232                                  * inodes by vfs_sync() to interfere with
1233                                  * I/O to the file, especially read I/O
1234                                  * where it is only the access time stamp
1235                                  * that is being flushed out.  To prevent
1236                                  * long periods where we have both inode
1237                                  * locks held shared here while reading the
1238                                  * inode's buffer in from disk, we drop the
1239                                  * inode lock while reading in the inode
1240                                  * buffer.  We have to release the buffer
1241                                  * and reacquire the inode lock so that they
1242                                  * are acquired in the proper order (inode
1243                                  * locks first).  The buffer will go at the
1244                                  * end of the lru chain, though, so we can
1245                                  * expect it to still be there when we go
1246                                  * for it again in xfs_iflush().
1247                                  */
1248                                 if ((xfs_ipincount(ip) == 0) &&
1249                                     xfs_iflock_nowait(ip)) {
1250
1251                                         xfs_ifunlock(ip);
1252                                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1253
1254                                         error = xfs_itobp(mp, NULL, ip,
1255                                                           &dip, &bp, 0, 0);
1256                                         if (!error) {
1257                                                 xfs_buf_relse(bp);
1258                                         } else {
1259                                                 /* Bailing out, remove the
1260                                                  * marker and free it.
1261                                                  */
1262                                                 XFS_MOUNT_ILOCK(mp);
1263                                                 IPOINTER_REMOVE(ip, mp);
1264                                                 XFS_MOUNT_IUNLOCK(mp);
1265
1266                                                 ASSERT(!(lock_flags &
1267                                                         XFS_IOLOCK_SHARED));
1268
1269                                                 kmem_free(ipointer,
1270                                                         sizeof(xfs_iptr_t));
1271                                                 return (0);
1272                                         }
1273
1274                                         /*
1275                                          * Since we dropped the inode lock,
1276                                          * the inode may have been reclaimed.
1277                                          * Therefore, we reacquire the mount
1278                                          * lock and check to see if we were the
1279                                          * inode reclaimed. If this happened
1280                                          * then the ipointer marker will no
1281                                          * longer point back at us. In this
1282                                          * case, move ip along to the inode
1283                                          * after the marker, remove the marker
1284                                          * and continue.
1285                                          */
1286                                         XFS_MOUNT_ILOCK(mp);
1287                                         mount_locked = B_TRUE;
1288
1289                                         if (ip != ipointer->ip_mprev) {
1290                                                 IPOINTER_REMOVE(ip, mp);
1291
1292                                                 ASSERT(!vnode_refed);
1293                                                 ASSERT(!(lock_flags &
1294                                                         XFS_IOLOCK_SHARED));
1295                                                 continue;
1296                                         }
1297
1298                                         ASSERT(ip->i_mount == mp);
1299
1300                                         if (xfs_ilock_nowait(ip,
1301                                                     XFS_ILOCK_SHARED) == 0) {
1302                                                 ASSERT(ip->i_mount == mp);
1303                                                 /*
1304                                                  * We failed to reacquire
1305                                                  * the inode lock without
1306                                                  * sleeping, so just skip
1307                                                  * the inode for now.  We
1308                                                  * clear the ILOCK bit from
1309                                                  * the lock_flags so that we
1310                                                  * won't try to drop a lock
1311                                                  * we don't hold below.
1312                                                  */
1313                                                 lock_flags &= ~XFS_ILOCK_SHARED;
1314                                                 IPOINTER_REMOVE(ip_next, mp);
1315                                         } else if ((xfs_ipincount(ip) == 0) &&
1316                                                    xfs_iflock_nowait(ip)) {
1317                                                 ASSERT(ip->i_mount == mp);
1318                                                 /*
1319                                                  * Since this is vfs_sync()
1320                                                  * calling we only flush the
1321                                                  * inode out if we can lock
1322                                                  * it without sleeping and
1323                                                  * it is not pinned.  Drop
1324                                                  * the mount lock here so
1325                                                  * that we don't hold it for
1326                                                  * too long. We already have
1327                                                  * a marker in the list here.
1328                                                  */
1329                                                 XFS_MOUNT_IUNLOCK(mp);
1330                                                 mount_locked = B_FALSE;
1331                                                 error = xfs_iflush(ip,
1332                                                            XFS_IFLUSH_DELWRI);
1333                                         } else {
1334                                                 ASSERT(ip->i_mount == mp);
1335                                                 IPOINTER_REMOVE(ip_next, mp);
1336                                         }
1337                                 }
1338
1339                         }
1340
1341                 } else {
1342                         if ((flags & SYNC_ATTR) &&
1343                             ((ip->i_update_core) ||
1344                              ((ip->i_itemp != NULL) &&
1345                               (ip->i_itemp->ili_format.ilf_fields != 0)))) {
1346                                 if (mount_locked) {
1347                                         IPOINTER_INSERT(ip, mp);
1348                                 }
1349
1350                                 if (flags & SYNC_WAIT) {
1351                                         xfs_iflock(ip);
1352                                         error = xfs_iflush(ip,
1353                                                            XFS_IFLUSH_SYNC);
1354                                 } else {
1355                                         /*
1356                                          * If we can't acquire the flush
1357                                          * lock, then the inode is already
1358                                          * being flushed so don't bother
1359                                          * waiting.  If we can lock it then
1360                                          * do a delwri flush so we can
1361                                          * combine multiple inode flushes
1362                                          * in each disk write.
1363                                          */
1364                                         if (xfs_iflock_nowait(ip)) {
1365                                                 error = xfs_iflush(ip,
1366                                                            XFS_IFLUSH_DELWRI);
1367                                         }
1368                                         else if (bypassed)
1369                                                 (*bypassed)++;
1370                                 }
1371                         }
1372                 }
1373
1374                 if (lock_flags != 0) {
1375                         xfs_iunlock(ip, lock_flags);
1376                 }
1377
1378                 if (vnode_refed) {
1379                         /*
1380                          * If we had to take a reference on the vnode
1381                          * above, then wait until after we've unlocked
1382                          * the inode to release the reference.  This is
1383                          * because we can be already holding the inode
1384                          * lock when VN_RELE() calls xfs_inactive().
1385                          *
1386                          * Make sure to drop the mount lock before calling
1387                          * VN_RELE() so that we don't trip over ourselves if
1388                          * we have to go for the mount lock again in the
1389                          * inactive code.
1390                          */
1391                         if (mount_locked) {
1392                                 IPOINTER_INSERT(ip, mp);
1393                         }
1394
1395                         VN_RELE(vp);
1396
1397                         vnode_refed = B_FALSE;
1398                 }
1399
1400                 if (error) {
1401                         last_error = error;
1402                 }
1403
1404                 /*
1405                  * bail out if the filesystem is corrupted.
1406                  */
1407                 if (error == EFSCORRUPTED)  {
1408                         if (!mount_locked) {
1409                                 XFS_MOUNT_ILOCK(mp);
1410                                 IPOINTER_REMOVE(ip, mp);
1411                         }
1412                         XFS_MOUNT_IUNLOCK(mp);
1413                         ASSERT(ipointer_in == B_FALSE);
1414                         kmem_free(ipointer, sizeof(xfs_iptr_t));
1415                         return XFS_ERROR(error);
1416                 }
1417
1418                 /* Let other threads have a chance at the mount lock
1419                  * if we have looped many times without dropping the
1420                  * lock.
1421                  */
1422                 if ((++preempt & XFS_PREEMPT_MASK) == 0) {
1423                         if (mount_locked) {
1424                                 IPOINTER_INSERT(ip, mp);
1425                         }
1426                 }
1427
1428                 if (mount_locked == B_FALSE) {
1429                         XFS_MOUNT_ILOCK(mp);
1430                         mount_locked = B_TRUE;
1431                         IPOINTER_REMOVE(ip, mp);
1432                         continue;
1433                 }
1434
1435                 ASSERT(ipointer_in == B_FALSE);
1436                 ip = ip->i_mnext;
1437
1438         } while (ip != mp->m_inodes);
1439
1440         XFS_MOUNT_IUNLOCK(mp);
1441
1442         ASSERT(ipointer_in == B_FALSE);
1443
1444         kmem_free(ipointer, sizeof(xfs_iptr_t));
1445         return XFS_ERROR(last_error);
1446 }
1447
1448 /*
1449  * xfs sync routine for internal use
1450  *
1451  * This routine supports all of the flags defined for the generic vfs_sync
1452  * interface as explained above under xfs_sync.
1453  *
1454  */
1455 int
1456 xfs_syncsub(
1457         xfs_mount_t     *mp,
1458         int             flags,
1459         int             *bypassed)
1460 {
1461         int             error = 0;
1462         int             last_error = 0;
1463         uint            log_flags = XFS_LOG_FORCE;
1464         xfs_buf_t       *bp;
1465         xfs_buf_log_item_t      *bip;
1466
1467         /*
1468          * Sync out the log.  This ensures that the log is periodically
1469          * flushed even if there is not enough activity to fill it up.
1470          */
1471         if (flags & SYNC_WAIT)
1472                 log_flags |= XFS_LOG_SYNC;
1473
1474         xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1475
1476         if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
1477                 if (flags & SYNC_BDFLUSH)
1478                         xfs_finish_reclaim_all(mp, 1);
1479                 else
1480                         error = xfs_sync_inodes(mp, flags, bypassed);
1481         }
1482
1483         /*
1484          * Flushing out dirty data above probably generated more
1485          * log activity, so if this isn't vfs_sync() then flush
1486          * the log again.
1487          */
1488         if (flags & SYNC_DELWRI) {
1489                 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1490         }
1491
1492         if (flags & SYNC_FSDATA) {
1493                 /*
1494                  * If this is vfs_sync() then only sync the superblock
1495                  * if we can lock it without sleeping and it is not pinned.
1496                  */
1497                 if (flags & SYNC_BDFLUSH) {
1498                         bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
1499                         if (bp != NULL) {
1500                                 bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
1501                                 if ((bip != NULL) &&
1502                                     xfs_buf_item_dirty(bip)) {
1503                                         if (!(XFS_BUF_ISPINNED(bp))) {
1504                                                 XFS_BUF_ASYNC(bp);
1505                                                 error = xfs_bwrite(mp, bp);
1506                                         } else {
1507                                                 xfs_buf_relse(bp);
1508                                         }
1509                                 } else {
1510                                         xfs_buf_relse(bp);
1511                                 }
1512                         }
1513                 } else {
1514                         bp = xfs_getsb(mp, 0);
1515                         /*
1516                          * If the buffer is pinned then push on the log so
1517                          * we won't get stuck waiting in the write for
1518                          * someone, maybe ourselves, to flush the log.
1519                          * Even though we just pushed the log above, we
1520                          * did not have the superblock buffer locked at
1521                          * that point so it can become pinned in between
1522                          * there and here.
1523                          */
1524                         if (XFS_BUF_ISPINNED(bp))
1525                                 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
1526                         if (flags & SYNC_WAIT)
1527                                 XFS_BUF_UNASYNC(bp);
1528                         else
1529                                 XFS_BUF_ASYNC(bp);
1530                         error = xfs_bwrite(mp, bp);
1531                 }
1532                 if (error) {
1533                         last_error = error;
1534                 }
1535         }
1536
1537         /*
1538          * If this is the periodic sync, then kick some entries out of
1539          * the reference cache.  This ensures that idle entries are
1540          * eventually kicked out of the cache.
1541          */
1542         if (flags & SYNC_REFCACHE) {
1543                 if (flags & SYNC_WAIT)
1544                         xfs_refcache_purge_mp(mp);
1545                 else
1546                         xfs_refcache_purge_some(mp);
1547         }
1548
1549         /*
1550          * If asked, update the disk superblock with incore counter values if we
1551          * are using non-persistent counters so that they don't get too far out
1552          * of sync if we crash or get a forced shutdown. We don't want to force
1553          * this to disk, just get a transaction into the iclogs....
1554          */
1555         if (flags & SYNC_SUPER)
1556                 xfs_log_sbcount(mp, 0);
1557
1558         /*
1559          * Now check to see if the log needs a "dummy" transaction.
1560          */
1561
1562         if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
1563                 xfs_trans_t *tp;
1564                 xfs_inode_t *ip;
1565
1566                 /*
1567                  * Put a dummy transaction in the log to tell
1568                  * recovery that all others are OK.
1569                  */
1570                 tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
1571                 if ((error = xfs_trans_reserve(tp, 0,
1572                                 XFS_ICHANGE_LOG_RES(mp),
1573                                 0, 0, 0)))  {
1574                         xfs_trans_cancel(tp, 0);
1575                         return error;
1576                 }
1577
1578                 ip = mp->m_rootip;
1579                 xfs_ilock(ip, XFS_ILOCK_EXCL);
1580
1581                 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1582                 xfs_trans_ihold(tp, ip);
1583                 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1584                 error = xfs_trans_commit(tp, 0);
1585                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1586                 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1587         }
1588
1589         /*
1590          * When shutting down, we need to insure that the AIL is pushed
1591          * to disk or the filesystem can appear corrupt from the PROM.
1592          */
1593         if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
1594                 XFS_bflush(mp->m_ddev_targp);
1595                 if (mp->m_rtdev_targp) {
1596                         XFS_bflush(mp->m_rtdev_targp);
1597                 }
1598         }
1599
1600         return XFS_ERROR(last_error);
1601 }
1602
1603 /*
1604  * xfs_vget - called by DMAPI and NFSD to get vnode from file handle
1605  */
1606 STATIC int
1607 xfs_vget(
1608         bhv_desc_t      *bdp,
1609         bhv_vnode_t     **vpp,
1610         fid_t           *fidp)
1611 {
1612         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
1613         xfs_fid_t       *xfid = (struct xfs_fid *)fidp;
1614         xfs_inode_t     *ip;
1615         int             error;
1616         xfs_ino_t       ino;
1617         unsigned int    igen;
1618
1619         /*
1620          * Invalid.  Since handles can be created in user space and passed in
1621          * via gethandle(), this is not cause for a panic.
1622          */
1623         if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
1624                 return XFS_ERROR(EINVAL);
1625
1626         ino  = xfid->xfs_fid_ino;
1627         igen = xfid->xfs_fid_gen;
1628
1629         /*
1630          * NFS can sometimes send requests for ino 0.  Fail them gracefully.
1631          */
1632         if (ino == 0)
1633                 return XFS_ERROR(ESTALE);
1634
1635         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
1636         if (error) {
1637                 *vpp = NULL;
1638                 return error;
1639         }
1640
1641         if (ip == NULL) {
1642                 *vpp = NULL;
1643                 return XFS_ERROR(EIO);
1644         }
1645
1646         if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
1647                 xfs_iput_new(ip, XFS_ILOCK_SHARED);
1648                 *vpp = NULL;
1649                 return XFS_ERROR(ENOENT);
1650         }
1651
1652         *vpp = XFS_ITOV(ip);
1653         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1654         return 0;
1655 }
1656
1657
1658 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
1659 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
1660 #define MNTOPT_LOGDEV   "logdev"        /* log device */
1661 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
1662 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
1663 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
1664 #define MNTOPT_INO64    "ino64"         /* force inodes into 64-bit range */
1665 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
1666 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
1667 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
1668 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
1669 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
1670 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
1671 #define MNTOPT_GRPID    "grpid"         /* group-ID from parent directory */
1672 #define MNTOPT_NOGRPID  "nogrpid"       /* group-ID from current process */
1673 #define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
1674 #define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
1675 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
1676 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
1677 #define MNTOPT_BARRIER  "barrier"       /* use writer barriers for log write and
1678                                          * unwritten extent conversion */
1679 #define MNTOPT_NOBARRIER "nobarrier"    /* .. disable */
1680 #define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
1681 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
1682 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
1683 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
1684 #define MNTOPT_LARGEIO     "largeio"    /* report large I/O sizes in stat() */
1685 #define MNTOPT_NOLARGEIO   "nolargeio"  /* do not report large I/O sizes
1686                                          * in stat(). */
1687 #define MNTOPT_ATTR2    "attr2"         /* do use attr2 attribute format */
1688 #define MNTOPT_NOATTR2  "noattr2"       /* do not use attr2 attribute format */
1689 #define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
1690
1691 STATIC unsigned long
1692 suffix_strtoul(char *s, char **endp, unsigned int base)
1693 {
1694         int     last, shift_left_factor = 0;
1695         char    *value = s;
1696
1697         last = strlen(value) - 1;
1698         if (value[last] == 'K' || value[last] == 'k') {
1699                 shift_left_factor = 10;
1700                 value[last] = '\0';
1701         }
1702         if (value[last] == 'M' || value[last] == 'm') {
1703                 shift_left_factor = 20;
1704                 value[last] = '\0';
1705         }
1706         if (value[last] == 'G' || value[last] == 'g') {
1707                 shift_left_factor = 30;
1708                 value[last] = '\0';
1709         }
1710
1711         return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
1712 }
1713
1714 STATIC int
1715 xfs_parseargs(
1716         struct bhv_desc         *bhv,
1717         char                    *options,
1718         struct xfs_mount_args   *args,
1719         int                     update)
1720 {
1721         bhv_vfs_t               *vfsp = bhvtovfs(bhv);
1722         char                    *this_char, *value, *eov;
1723         int                     dsunit, dswidth, vol_dsunit, vol_dswidth;
1724         int                     iosize;
1725
1726         /*
1727          * Applications using DMI filesystems often expect the
1728          * inode generation number to be monotonically increasing.
1729          * If we delete inode chunks we break this assumption, so
1730          * keep unused inode chunks on disk for DMI filesystems
1731          * until we come up with a better solution.
1732          * Note that if "ikeep" or "noikeep" mount options are
1733          * supplied, then they are honored.
1734          */
1735         if (!(args->flags & XFSMNT_DMAPI))
1736                 args->flags |= XFSMNT_IDELETE;
1737
1738         args->flags |= XFSMNT_BARRIER;
1739         args->flags2 |= XFSMNT2_COMPAT_IOSIZE;
1740
1741         if (!options)
1742                 goto done;
1743
1744         iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;
1745
1746         while ((this_char = strsep(&options, ",")) != NULL) {
1747                 if (!*this_char)
1748                         continue;
1749                 if ((value = strchr(this_char, '=')) != NULL)
1750                         *value++ = 0;
1751
1752                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
1753                         if (!value || !*value) {
1754                                 cmn_err(CE_WARN,
1755                                         "XFS: %s option requires an argument",
1756                                         this_char);
1757                                 return EINVAL;
1758                         }
1759                         args->logbufs = simple_strtoul(value, &eov, 10);
1760                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
1761                         if (!value || !*value) {
1762                                 cmn_err(CE_WARN,
1763                                         "XFS: %s option requires an argument",
1764                                         this_char);
1765                                 return EINVAL;
1766                         }
1767                         args->logbufsize = suffix_strtoul(value, &eov, 10);
1768                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
1769                         if (!value || !*value) {
1770                                 cmn_err(CE_WARN,
1771                                         "XFS: %s option requires an argument",
1772                                         this_char);
1773                                 return EINVAL;
1774                         }
1775                         strncpy(args->logname, value, MAXNAMELEN);
1776                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
1777                         if (!value || !*value) {
1778                                 cmn_err(CE_WARN,
1779                                         "XFS: %s option requires an argument",
1780                                         this_char);
1781                                 return EINVAL;
1782                         }
1783                         strncpy(args->mtpt, value, MAXNAMELEN);
1784                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
1785                         if (!value || !*value) {
1786                                 cmn_err(CE_WARN,
1787                                         "XFS: %s option requires an argument",
1788                                         this_char);
1789                                 return EINVAL;
1790                         }
1791                         strncpy(args->rtname, value, MAXNAMELEN);
1792                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
1793                         if (!value || !*value) {
1794                                 cmn_err(CE_WARN,
1795                                         "XFS: %s option requires an argument",
1796                                         this_char);
1797                                 return EINVAL;
1798                         }
1799                         iosize = simple_strtoul(value, &eov, 10);
1800                         args->flags |= XFSMNT_IOSIZE;
1801                         args->iosizelog = (uint8_t) iosize;
1802                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
1803                         if (!value || !*value) {
1804                                 cmn_err(CE_WARN,
1805                                         "XFS: %s option requires an argument",
1806                                         this_char);
1807                                 return EINVAL;
1808                         }
1809                         iosize = suffix_strtoul(value, &eov, 10);
1810                         args->flags |= XFSMNT_IOSIZE;
1811                         args->iosizelog = ffs(iosize) - 1;
1812                 } else if (!strcmp(this_char, MNTOPT_GRPID) ||
1813                            !strcmp(this_char, MNTOPT_BSDGROUPS)) {
1814                         vfsp->vfs_flag |= VFS_GRPID;
1815                 } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
1816                            !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
1817                         vfsp->vfs_flag &= ~VFS_GRPID;
1818                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
1819                         args->flags |= XFSMNT_WSYNC;
1820                 } else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
1821                         args->flags |= XFSMNT_OSYNCISOSYNC;
1822                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
1823                         args->flags |= XFSMNT_NORECOVERY;
1824                 } else if (!strcmp(this_char, MNTOPT_INO64)) {
1825                         args->flags |= XFSMNT_INO64;
1826 #if !XFS_BIG_INUMS
1827                         cmn_err(CE_WARN,
1828                                 "XFS: %s option not allowed on this system",
1829                                 this_char);
1830                         return EINVAL;
1831 #endif
1832                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
1833                         args->flags |= XFSMNT_NOALIGN;
1834                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
1835                         args->flags |= XFSMNT_SWALLOC;
1836                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
1837                         if (!value || !*value) {
1838                                 cmn_err(CE_WARN,
1839                                         "XFS: %s option requires an argument",
1840                                         this_char);
1841                                 return EINVAL;
1842                         }
1843                         dsunit = simple_strtoul(value, &eov, 10);
1844                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
1845                         if (!value || !*value) {
1846                                 cmn_err(CE_WARN,
1847                                         "XFS: %s option requires an argument",
1848                                         this_char);
1849                                 return EINVAL;
1850                         }
1851                         dswidth = simple_strtoul(value, &eov, 10);
1852                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
1853                         args->flags &= ~XFSMNT_32BITINODES;
1854 #if !XFS_BIG_INUMS
1855                         cmn_err(CE_WARN,
1856                                 "XFS: %s option not allowed on this system",
1857                                 this_char);
1858                         return EINVAL;
1859 #endif
1860                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
1861                         args->flags |= XFSMNT_NOUUID;
1862                 } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
1863                         args->flags |= XFSMNT_BARRIER;
1864                 } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
1865                         args->flags &= ~XFSMNT_BARRIER;
1866                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
1867                         args->flags &= ~XFSMNT_IDELETE;
1868                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
1869                         args->flags |= XFSMNT_IDELETE;
1870                 } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
1871                         args->flags2 &= ~XFSMNT2_COMPAT_IOSIZE;
1872                 } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
1873                         args->flags2 |= XFSMNT2_COMPAT_IOSIZE;
1874                 } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
1875                         args->flags |= XFSMNT_ATTR2;
1876                 } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
1877                         args->flags &= ~XFSMNT_ATTR2;
1878                 } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
1879                         args->flags2 |= XFSMNT2_FILESTREAMS;
1880                 } else if (!strcmp(this_char, "ihashsize")) {
1881                         cmn_err(CE_WARN,
1882         "XFS: ihashsize no longer used, option is deprecated.");
1883                 } else if (!strcmp(this_char, "osyncisdsync")) {
1884                         /* no-op, this is now the default */
1885                         cmn_err(CE_WARN,
1886         "XFS: osyncisdsync is now the default, option is deprecated.");
1887                 } else if (!strcmp(this_char, "irixsgid")) {
1888                         cmn_err(CE_WARN,
1889         "XFS: irixsgid is now a sysctl(2) variable, option is deprecated.");
1890                 } else {
1891                         cmn_err(CE_WARN,
1892                                 "XFS: unknown mount option [%s].", this_char);
1893                         return EINVAL;
1894                 }
1895         }
1896
1897         if (args->flags & XFSMNT_NORECOVERY) {
1898                 if ((vfsp->vfs_flag & VFS_RDONLY) == 0) {
1899                         cmn_err(CE_WARN,
1900                                 "XFS: no-recovery mounts must be read-only.");
1901                         return EINVAL;
1902                 }
1903         }
1904
1905         if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
1906                 cmn_err(CE_WARN,
1907         "XFS: sunit and swidth options incompatible with the noalign option");
1908                 return EINVAL;
1909         }
1910
1911         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
1912                 cmn_err(CE_WARN,
1913                         "XFS: sunit and swidth must be specified together");
1914                 return EINVAL;
1915         }
1916
1917         if (dsunit && (dswidth % dsunit != 0)) {
1918                 cmn_err(CE_WARN,
1919         "XFS: stripe width (%d) must be a multiple of the stripe unit (%d)",
1920                         dswidth, dsunit);
1921                 return EINVAL;
1922         }
1923
1924         if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
1925                 if (dsunit) {
1926                         args->sunit = dsunit;
1927                         args->flags |= XFSMNT_RETERR;
1928                 } else {
1929                         args->sunit = vol_dsunit;
1930                 }
1931                 dswidth ? (args->swidth = dswidth) :
1932                           (args->swidth = vol_dswidth);
1933         } else {
1934                 args->sunit = args->swidth = 0;
1935         }
1936
1937 done:
1938         if (args->flags & XFSMNT_32BITINODES)
1939                 vfsp->vfs_flag |= VFS_32BITINODES;
1940         if (args->flags2)
1941                 args->flags |= XFSMNT_FLAGS2;
1942         return 0;
1943 }
1944
1945 STATIC int
1946 xfs_showargs(
1947         struct bhv_desc         *bhv,
1948         struct seq_file         *m)
1949 {
1950         static struct proc_xfs_info {
1951                 int     flag;
1952                 char    *str;
1953         } xfs_info[] = {
1954                 /* the few simple ones we can get from the mount struct */
1955                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
1956                 { XFS_MOUNT_INO64,              "," MNTOPT_INO64 },
1957                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
1958                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
1959                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
1960                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
1961                 { XFS_MOUNT_OSYNCISOSYNC,       "," MNTOPT_OSYNCISOSYNC },
1962                 { 0, NULL }
1963         };
1964         struct proc_xfs_info    *xfs_infop;
1965         struct xfs_mount        *mp = XFS_BHVTOM(bhv);
1966         struct bhv_vfs          *vfsp = XFS_MTOVFS(mp);
1967
1968         for (xfs_infop = xfs_info; xfs_infop->flag; xfs_infop++) {
1969                 if (mp->m_flags & xfs_infop->flag)
1970                         seq_puts(m, xfs_infop->str);
1971         }
1972
1973         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
1974                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
1975                                 (int)(1 << mp->m_writeio_log) >> 10);
1976
1977         if (mp->m_logbufs > 0)
1978                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
1979         if (mp->m_logbsize > 0)
1980                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
1981
1982         if (mp->m_logname)
1983                 seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
1984         if (mp->m_rtname)
1985                 seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
1986
1987         if (mp->m_dalign > 0)
1988                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
1989                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
1990         if (mp->m_swidth > 0)
1991                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
1992                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
1993
1994         if (!(mp->m_flags & XFS_MOUNT_IDELETE))
1995                 seq_printf(m, "," MNTOPT_IKEEP);
1996         if (!(mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE))
1997                 seq_printf(m, "," MNTOPT_LARGEIO);
1998
1999         if (!(vfsp->vfs_flag & VFS_32BITINODES))
2000                 seq_printf(m, "," MNTOPT_64BITINODE);
2001         if (vfsp->vfs_flag & VFS_GRPID)
2002                 seq_printf(m, "," MNTOPT_GRPID);
2003
2004         return 0;
2005 }
2006
2007 /*
2008  * Second stage of a freeze. The data is already frozen so we only
2009  * need to take care of themetadata. Once that's done write a dummy
2010  * record to dirty the log in case of a crash while frozen.
2011  */
2012 STATIC void
2013 xfs_freeze(
2014         bhv_desc_t      *bdp)
2015 {
2016         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
2017
2018         xfs_attr_quiesce(mp);
2019         xfs_fs_log_dummy(mp);
2020 }
2021
2022
2023 bhv_vfsops_t xfs_vfsops = {
2024         BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS),
2025         .vfs_parseargs          = xfs_parseargs,
2026         .vfs_showargs           = xfs_showargs,
2027         .vfs_mount              = xfs_mount,
2028         .vfs_unmount            = xfs_unmount,
2029         .vfs_mntupdate          = xfs_mntupdate,
2030         .vfs_root               = xfs_root,
2031         .vfs_statvfs            = xfs_statvfs,
2032         .vfs_sync               = xfs_sync,
2033         .vfs_vget               = xfs_vget,
2034         .vfs_dmapiops           = (vfs_dmapiops_t)fs_nosys,
2035         .vfs_quotactl           = (vfs_quotactl_t)fs_nosys,
2036         .vfs_init_vnode         = xfs_initialize_vnode,
2037         .vfs_force_shutdown     = xfs_do_force_shutdown,
2038         .vfs_freeze             = xfs_freeze,
2039 };