git.oblomov.eu Git - linux-2.6/blob - fs/xfs/xfs_vfsops.c

   1 /*
   2  * XFS filesystem operations.
   3  *
   4  * Copyright (c) 2000-2005 Silicon Graphics, Inc.  All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  *
  14  * Further, this software is distributed without any warranty that it is
  15  * free of the rightful claim of any third person regarding infringement
  16  * or the like.  Any license provided herein, whether implied or
  17  * otherwise, applies only to this software file.  Patent licenses, if
  18  * any, provided herein do not apply to combinations of this program with
  19  * other software, or any other product whatsoever.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write the Free Software Foundation, Inc., 59
  23  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  24  *
  25  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  26  * Mountain View, CA  94043, or:
  27  *
  28  * http://www.sgi.com
  29  *
  30  * For further information regarding this notice, see:
  31  *
  32  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  33  */
  34
  35 #include "xfs.h"
  36 #include "xfs_macros.h"
  37 #include "xfs_types.h"
  38 #include "xfs_inum.h"
  39 #include "xfs_log.h"
  40 #include "xfs_trans.h"
  41 #include "xfs_sb.h"
  42 #include "xfs_dir.h"
  43 #include "xfs_dir2.h"
  44 #include "xfs_dmapi.h"
  45 #include "xfs_mount.h"
  46 #include "xfs_bmap_btree.h"
  47 #include "xfs_ialloc_btree.h"
  48 #include "xfs_alloc_btree.h"
  49 #include "xfs_btree.h"
  50 #include "xfs_alloc.h"
  51 #include "xfs_ialloc.h"
  52 #include "xfs_attr_sf.h"
  53 #include "xfs_dir_sf.h"
  54 #include "xfs_dir2_sf.h"
  55 #include "xfs_dinode.h"
  56 #include "xfs_inode_item.h"
  57 #include "xfs_inode.h"
  58 #include "xfs_ag.h"
  59 #include "xfs_error.h"
  60 #include "xfs_bmap.h"
  61 #include "xfs_da_btree.h"
  62 #include "xfs_rw.h"
  63 #include "xfs_refcache.h"
  64 #include "xfs_buf_item.h"
  65 #include "xfs_extfree_item.h"
  66 #include "xfs_quota.h"
  67 #include "xfs_dir2_trace.h"
  68 #include "xfs_acl.h"
  69 #include "xfs_attr.h"
  70 #include "xfs_clnt.h"
  71 #include "xfs_log_priv.h"
  72
  73 STATIC int xfs_sync(bhv_desc_t *, int, cred_t *);
  74
  75 int
  76 xfs_init(void)
  77 {
  78         extern kmem_zone_t      *xfs_bmap_free_item_zone;
  79         extern kmem_zone_t      *xfs_btree_cur_zone;
  80         extern kmem_zone_t      *xfs_trans_zone;
  81         extern kmem_zone_t      *xfs_buf_item_zone;
  82         extern kmem_zone_t      *xfs_dabuf_zone;
  83 #ifdef XFS_DABUF_DEBUG
  84         extern lock_t           xfs_dabuf_global_lock;
  85         spinlock_init(&xfs_dabuf_global_lock, "xfsda");
  86 #endif
  87
  88         /*
  89          * Initialize all of the zone allocators we use.
  90          */
  91         xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
  92                                                  "xfs_bmap_free_item");
  93         xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
  94                                             "xfs_btree_cur");
  95         xfs_inode_zone = kmem_zone_init(sizeof(xfs_inode_t), "xfs_inode");
  96         xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
  97         xfs_da_state_zone =
  98                 kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
  99         xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
 100
 101         /*
 102          * The size of the zone allocated buf log item is the maximum
 103          * size possible under XFS.  This wastes a little bit of memory,
 104          * but it is much faster.
 105          */
 106         xfs_buf_item_zone =
 107                 kmem_zone_init((sizeof(xfs_buf_log_item_t) +
 108                                 (((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
 109                                   NBWORD) * sizeof(int))),
 110                                "xfs_buf_item");
 111         xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
 112                                        ((XFS_EFD_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
 113                                       "xfs_efd_item");
 114         xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
 115                                        ((XFS_EFI_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
 116                                       "xfs_efi_item");
 117         xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
 118         xfs_ili_zone = kmem_zone_init(sizeof(xfs_inode_log_item_t), "xfs_ili");
 119         xfs_chashlist_zone = kmem_zone_init(sizeof(xfs_chashlist_t),
 120                                             "xfs_chashlist");
 121         xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
 122
 123         /*
 124          * Allocate global trace buffers.
 125          */
 126 #ifdef XFS_ALLOC_TRACE
 127         xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
 128 #endif
 129 #ifdef XFS_BMAP_TRACE
 130         xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
 131 #endif
 132 #ifdef XFS_BMBT_TRACE
 133         xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
 134 #endif
 135 #ifdef XFS_DIR_TRACE
 136         xfs_dir_trace_buf = ktrace_alloc(XFS_DIR_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_chashlist_zone;
 169
 170         xfs_cleanup_procfs();
 171         xfs_sysctl_unregister();
 172         xfs_refcache_destroy();
 173         xfs_acl_zone_destroy(xfs_acl_zone);
 174
 175 #ifdef XFS_DIR2_TRACE
 176         ktrace_free(xfs_dir2_trace_buf);
 177 #endif
 178 #ifdef XFS_ATTR_TRACE
 179         ktrace_free(xfs_attr_trace_buf);
 180 #endif
 181 #ifdef XFS_DIR_TRACE
 182         ktrace_free(xfs_dir_trace_buf);
 183 #endif
 184 #ifdef XFS_BMBT_TRACE
 185         ktrace_free(xfs_bmbt_trace_buf);
 186 #endif
 187 #ifdef XFS_BMAP_TRACE
 188         ktrace_free(xfs_bmap_trace_buf);
 189 #endif
 190 #ifdef XFS_ALLOC_TRACE
 191         ktrace_free(xfs_alloc_trace_buf);
 192 #endif
 193
 194         kmem_cache_destroy(xfs_bmap_free_item_zone);
 195         kmem_cache_destroy(xfs_btree_cur_zone);
 196         kmem_cache_destroy(xfs_inode_zone);
 197         kmem_cache_destroy(xfs_trans_zone);
 198         kmem_cache_destroy(xfs_da_state_zone);
 199         kmem_cache_destroy(xfs_dabuf_zone);
 200         kmem_cache_destroy(xfs_buf_item_zone);
 201         kmem_cache_destroy(xfs_efd_zone);
 202         kmem_cache_destroy(xfs_efi_zone);
 203         kmem_cache_destroy(xfs_ifork_zone);
 204         kmem_cache_destroy(xfs_ili_zone);
 205         kmem_cache_destroy(xfs_chashlist_zone);
 206 }
 207
 208 /*
 209  * xfs_start_flags
 210  *
 211  * This function fills in xfs_mount_t fields based on mount args.
 212  * Note: the superblock has _not_ yet been read in.
 213  */
 214 STATIC int
 215 xfs_start_flags(
 216         struct vfs              *vfs,
 217         struct xfs_mount_args   *ap,
 218         struct xfs_mount        *mp)
 219 {
 220         /* Values are in BBs */
 221         if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
 222                 /*
 223                  * At this point the superblock has not been read
 224                  * in, therefore we do not know the block size.
 225                  * Before the mount call ends we will convert
 226                  * these to FSBs.
 227                  */
 228                 mp->m_dalign = ap->sunit;
 229                 mp->m_swidth = ap->swidth;
 230         }
 231
 232         if (ap->logbufs != -1 &&
 233 #if defined(DEBUG) || defined(XLOG_NOLOG)
 234             ap->logbufs != 0 &&
 235 #endif
 236             (ap->logbufs < XLOG_MIN_ICLOGS ||
 237              ap->logbufs > XLOG_MAX_ICLOGS)) {
 238                 cmn_err(CE_WARN,
 239                         "XFS: invalid logbufs value: %d [not %d-%d]",
 240                         ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
 241                 return XFS_ERROR(EINVAL);
 242         }
 243         mp->m_logbufs = ap->logbufs;
 244         if (ap->logbufsize != -1 &&
 245             ap->logbufsize != 16 * 1024 &&
 246             ap->logbufsize != 32 * 1024 &&
 247             ap->logbufsize != 64 * 1024 &&
 248             ap->logbufsize != 128 * 1024 &&
 249             ap->logbufsize != 256 * 1024) {
 250                 cmn_err(CE_WARN,
 251         "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
 252                         ap->logbufsize);
 253                 return XFS_ERROR(EINVAL);
 254         }
 255         mp->m_ihsize = ap->ihashsize;
 256         mp->m_logbsize = ap->logbufsize;
 257         mp->m_fsname_len = strlen(ap->fsname) + 1;
 258         mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
 259         strcpy(mp->m_fsname, ap->fsname);
 260
 261         if (ap->flags & XFSMNT_WSYNC)
 262                 mp->m_flags |= XFS_MOUNT_WSYNC;
 263 #if XFS_BIG_INUMS
 264         if (ap->flags & XFSMNT_INO64) {
 265                 mp->m_flags |= XFS_MOUNT_INO64;
 266                 mp->m_inoadd = XFS_INO64_OFFSET;
 267         }
 268 #endif
 269         if (ap->flags & XFSMNT_NOATIME)
 270                 mp->m_flags |= XFS_MOUNT_NOATIME;
 271
 272         if (ap->flags & XFSMNT_RETERR)
 273                 mp->m_flags |= XFS_MOUNT_RETERR;
 274
 275         if (ap->flags & XFSMNT_NOALIGN)
 276                 mp->m_flags |= XFS_MOUNT_NOALIGN;
 277
 278         if (ap->flags & XFSMNT_SWALLOC)
 279                 mp->m_flags |= XFS_MOUNT_SWALLOC;
 280
 281         if (ap->flags & XFSMNT_OSYNCISOSYNC)
 282                 mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
 283
 284         if (ap->flags & XFSMNT_32BITINODES)
 285                 mp->m_flags |= (XFS_MOUNT_32BITINODES | XFS_MOUNT_32BITINOOPT);
 286
 287         if (ap->flags & XFSMNT_IOSIZE) {
 288                 if (ap->iosizelog > XFS_MAX_IO_LOG ||
 289                     ap->iosizelog < XFS_MIN_IO_LOG) {
 290                         cmn_err(CE_WARN,
 291                 "XFS: invalid log iosize: %d [not %d-%d]",
 292                                 ap->iosizelog, XFS_MIN_IO_LOG,
 293                                 XFS_MAX_IO_LOG);
 294                         return XFS_ERROR(EINVAL);
 295                 }
 296
 297                 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
 298                 mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
 299         }
 300
 301         if (ap->flags & XFSMNT_IHASHSIZE)
 302                 mp->m_flags |= XFS_MOUNT_IHASHSIZE;
 303
 304         if (ap->flags & XFSMNT_IDELETE)
 305                 mp->m_flags |= XFS_MOUNT_IDELETE;
 306
 307         if (ap->flags & XFSMNT_DIRSYNC)
 308                 mp->m_flags |= XFS_MOUNT_DIRSYNC;
 309
 310         /*
 311          * no recovery flag requires a read-only mount
 312          */
 313         if (ap->flags & XFSMNT_NORECOVERY) {
 314                 if (!(vfs->vfs_flag & VFS_RDONLY)) {
 315                         cmn_err(CE_WARN,
 316         "XFS: tried to mount a FS read-write without recovery!");
 317                         return XFS_ERROR(EINVAL);
 318                 }
 319                 mp->m_flags |= XFS_MOUNT_NORECOVERY;
 320         }
 321
 322         if (ap->flags & XFSMNT_NOUUID)
 323                 mp->m_flags |= XFS_MOUNT_NOUUID;
 324         if (ap->flags & XFSMNT_NOLOGFLUSH)
 325                 mp->m_flags |= XFS_MOUNT_NOLOGFLUSH;
 326
 327         return 0;
 328 }
 329
 330 /*
 331  * This function fills in xfs_mount_t fields based on mount args.
 332  * Note: the superblock _has_ now been read in.
 333  */
 334 STATIC int
 335 xfs_finish_flags(
 336         struct vfs              *vfs,
 337         struct xfs_mount_args   *ap,
 338         struct xfs_mount        *mp)
 339 {
 340         int                     ronly = (vfs->vfs_flag & VFS_RDONLY);
 341
 342         /* Fail a mount where the logbuf is smaller then the log stripe */
 343         if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
 344                 if ((ap->logbufsize == -1) &&
 345                     (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
 346                         mp->m_logbsize = mp->m_sb.sb_logsunit;
 347                 } else if (ap->logbufsize < mp->m_sb.sb_logsunit) {
 348                         cmn_err(CE_WARN,
 349         "XFS: logbuf size must be greater than or equal to log stripe size");
 350                         return XFS_ERROR(EINVAL);
 351                 }
 352         } else {
 353                 /* Fail a mount if the logbuf is larger than 32K */
 354                 if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
 355                         cmn_err(CE_WARN,
 356         "XFS: logbuf size for version 1 logs must be 16K or 32K");
 357                         return XFS_ERROR(EINVAL);
 358                 }
 359         }
 360
 361         /*
 362          * prohibit r/w mounts of read-only filesystems
 363          */
 364         if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
 365                 cmn_err(CE_WARN,
 366         "XFS: cannot mount a read-only filesystem as read-write");
 367                 return XFS_ERROR(EROFS);
 368         }
 369
 370         /*
 371          * disallow mount attempts with (IRIX) project quota enabled
 372          */
 373         if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 374             (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT)) {
 375                 cmn_err(CE_WARN,
 376         "XFS: cannot mount a filesystem with IRIX project quota enabled");
 377                 return XFS_ERROR(ENOSYS);
 378         }
 379
 380         /*
 381          * check for shared mount.
 382          */
 383         if (ap->flags & XFSMNT_SHARED) {
 384                 if (!XFS_SB_VERSION_HASSHARED(&mp->m_sb))
 385                         return XFS_ERROR(EINVAL);
 386
 387                 /*
 388                  * For IRIX 6.5, shared mounts must have the shared
 389                  * version bit set, have the persistent readonly
 390                  * field set, must be version 0 and can only be mounted
 391                  * read-only.
 392                  */
 393                 if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
 394                      (mp->m_sb.sb_shared_vn != 0))
 395                         return XFS_ERROR(EINVAL);
 396
 397                 mp->m_flags |= XFS_MOUNT_SHARED;
 398
 399                 /*
 400                  * Shared XFS V0 can't deal with DMI.  Return EINVAL.
 401                  */
 402                 if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
 403                         return XFS_ERROR(EINVAL);
 404         }
 405
 406         return 0;
 407 }
 408
 409 /*
 410  * xfs_mount
 411  *
 412  * The file system configurations are:
 413  *      (1) device (partition) with data and internal log
 414  *      (2) logical volume with data and log subvolumes.
 415  *      (3) logical volume with data, log, and realtime subvolumes.
 416  *
 417  * We only have to handle opening the log and realtime volumes here if
 418  * they are present.  The data subvolume has already been opened by
 419  * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
 420  */
 421 STATIC int
 422 xfs_mount(
 423         struct bhv_desc         *bhvp,
 424         struct xfs_mount_args   *args,
 425         cred_t                  *credp)
 426 {
 427         struct vfs              *vfsp = bhvtovfs(bhvp);
 428         struct bhv_desc         *p;
 429         struct xfs_mount        *mp = XFS_BHVTOM(bhvp);
 430         struct block_device     *ddev, *logdev, *rtdev;
 431         int                     flags = 0, error;
 432
 433         ddev = vfsp->vfs_super->s_bdev;
 434         logdev = rtdev = NULL;
 435
 436         /*
 437          * Setup xfs_mount function vectors from available behaviors
 438          */
 439         p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
 440         mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
 441         p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
 442         mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
 443         p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
 444         mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs;
 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                         goto error0;
 484         }
 485         mp->m_logdev_targp = (logdev && logdev != ddev) ?
 486                                 xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
 487         if (!mp->m_logdev_targp)
 488                 goto error0;
 489
 490         /*
 491          * Setup flags based on mount(2) options and then the superblock
 492          */
 493         error = xfs_start_flags(vfsp, args, mp);
 494         if (error)
 495                 goto error1;
 496         error = xfs_readsb(mp);
 497         if (error)
 498                 goto error1;
 499         error = xfs_finish_flags(vfsp, args, mp);
 500         if (error)
 501                 goto error2;
 502
 503         /*
 504          * Setup xfs_mount buffer target pointers based on superblock
 505          */
 506         error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
 507                                     mp->m_sb.sb_sectsize);
 508         if (!error && logdev && logdev != ddev) {
 509                 unsigned int    log_sector_size = BBSIZE;
 510
 511                 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb))
 512                         log_sector_size = mp->m_sb.sb_logsectsize;
 513                 error = xfs_setsize_buftarg(mp->m_logdev_targp,
 514                                             mp->m_sb.sb_blocksize,
 515                                             log_sector_size);
 516         }
 517         if (!error && rtdev)
 518                 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
 519                                             mp->m_sb.sb_blocksize,
 520                                             mp->m_sb.sb_sectsize);
 521         if (error)
 522                 goto error2;
 523
 524         error = XFS_IOINIT(vfsp, args, flags);
 525         if (!error)
 526                 return 0;
 527 error2:
 528         if (mp->m_sb_bp)
 529                 xfs_freesb(mp);
 530 error1:
 531         xfs_binval(mp->m_ddev_targp);
 532         if (logdev && logdev != ddev)
 533                 xfs_binval(mp->m_logdev_targp);
 534         if (rtdev)
 535                 xfs_binval(mp->m_rtdev_targp);
 536 error0:
 537         xfs_unmountfs_close(mp, credp);
 538         return error;
 539 }
 540
 541 STATIC int
 542 xfs_unmount(
 543         bhv_desc_t      *bdp,
 544         int             flags,
 545         cred_t          *credp)
 546 {
 547         struct vfs      *vfsp = bhvtovfs(bdp);
 548         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 549         xfs_inode_t     *rip;
 550         vnode_t         *rvp;
 551         int             unmount_event_wanted = 0;
 552         int             unmount_event_flags = 0;
 553         int             xfs_unmountfs_needed = 0;
 554         int             error;
 555
 556         rip = mp->m_rootip;
 557         rvp = XFS_ITOV(rip);
 558
 559         if (vfsp->vfs_flag & VFS_DMI) {
 560                 error = XFS_SEND_PREUNMOUNT(mp, vfsp,
 561                                 rvp, DM_RIGHT_NULL, rvp, DM_RIGHT_NULL,
 562                                 NULL, NULL, 0, 0,
 563                                 (mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))?
 564                                         0:DM_FLAGS_UNWANTED);
 565                         if (error)
 566                                 return XFS_ERROR(error);
 567                 unmount_event_wanted = 1;
 568                 unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))?
 569                                         0 : DM_FLAGS_UNWANTED;
 570         }
 571
 572         /*
 573          * First blow any referenced inode from this file system
 574          * out of the reference cache, and delete the timer.
 575          */
 576         xfs_refcache_purge_mp(mp);
 577
 578         XFS_bflush(mp->m_ddev_targp);
 579         error = xfs_unmount_flush(mp, 0);
 580         if (error)
 581                 goto out;
 582
 583         ASSERT(vn_count(rvp) == 1);
 584
 585         /*
 586          * Drop the reference count
 587          */
 588         VN_RELE(rvp);
 589
 590         /*
 591          * If we're forcing a shutdown, typically because of a media error,
 592          * we want to make sure we invalidate dirty pages that belong to
 593          * referenced vnodes as well.
 594          */
 595         if (XFS_FORCED_SHUTDOWN(mp)) {
 596                 error = xfs_sync(&mp->m_bhv,
 597                          (SYNC_WAIT | SYNC_CLOSE), credp);
 598                 ASSERT(error != EFSCORRUPTED);
 599         }
 600         xfs_unmountfs_needed = 1;
 601
 602 out:
 603         /*      Send DMAPI event, if required.
 604          *      Then do xfs_unmountfs() if needed.
 605          *      Then return error (or zero).
 606          */
 607         if (unmount_event_wanted) {
 608                 /* Note: mp structure must still exist for
 609                  * XFS_SEND_UNMOUNT() call.
 610                  */
 611                 XFS_SEND_UNMOUNT(mp, vfsp, error == 0 ? rvp : NULL,
 612                         DM_RIGHT_NULL, 0, error, unmount_event_flags);
 613         }
 614         if (xfs_unmountfs_needed) {
 615                 /*
 616                  * Call common unmount function to flush to disk
 617                  * and free the super block buffer & mount structures.
 618                  */
 619                 xfs_unmountfs(mp, credp);
 620         }
 621
 622         return XFS_ERROR(error);
 623 }
 624
 625 #define REMOUNT_READONLY_FLAGS  (SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT)
 626
 627 STATIC int
 628 xfs_mntupdate(
 629         bhv_desc_t                      *bdp,
 630         int                             *flags,
 631         struct xfs_mount_args           *args)
 632 {
 633         struct vfs      *vfsp = bhvtovfs(bdp);
 634         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 635         int             pincount, error;
 636         int             count = 0;
 637
 638         if (args->flags & XFSMNT_NOATIME)
 639                 mp->m_flags |= XFS_MOUNT_NOATIME;
 640         else
 641                 mp->m_flags &= ~XFS_MOUNT_NOATIME;
 642
 643         if (!(vfsp->vfs_flag & VFS_RDONLY)) {
 644                 VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL, error);
 645         }
 646
 647         if (*flags & MS_RDONLY) {
 648                 xfs_refcache_purge_mp(mp);
 649                 xfs_flush_buftarg(mp->m_ddev_targp, 0);
 650                 xfs_finish_reclaim_all(mp, 0);
 651
 652                 /* This loop must run at least twice.
 653                  * The first instance of the loop will flush
 654                  * most meta data but that will generate more
 655                  * meta data (typically directory updates).
 656                  * Which then must be flushed and logged before
 657                  * we can write the unmount record.
 658                  */
 659                 do {
 660                         VFS_SYNC(vfsp, REMOUNT_READONLY_FLAGS, NULL, error);
 661                         pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
 662                         if (!pincount) {
 663                                 delay(50);
 664                                 count++;
 665                         }
 666                 } while (count < 2);
 667
 668                 /* Ok now write out an unmount record */
 669                 xfs_log_unmount_write(mp);
 670                 xfs_unmountfs_writesb(mp);
 671                 vfsp->vfs_flag |= VFS_RDONLY;
 672         } else {
 673                 vfsp->vfs_flag &= ~VFS_RDONLY;
 674         }
 675
 676         return 0;
 677 }
 678
 679 /*
 680  * xfs_unmount_flush implements a set of flush operation on special
 681  * inodes, which are needed as a separate set of operations so that
 682  * they can be called as part of relocation process.
 683  */
 684 int
 685 xfs_unmount_flush(
 686         xfs_mount_t     *mp,            /* Mount structure we are getting
 687                                            rid of. */
 688         int             relocation)     /* Called from vfs relocation. */
 689 {
 690         xfs_inode_t     *rip = mp->m_rootip;
 691         xfs_inode_t     *rbmip;
 692         xfs_inode_t     *rsumip = NULL;
 693         vnode_t         *rvp = XFS_ITOV(rip);
 694         int             error;
 695
 696         xfs_ilock(rip, XFS_ILOCK_EXCL);
 697         xfs_iflock(rip);
 698
 699         /*
 700          * Flush out the real time inodes.
 701          */
 702         if ((rbmip = mp->m_rbmip) != NULL) {
 703                 xfs_ilock(rbmip, XFS_ILOCK_EXCL);
 704                 xfs_iflock(rbmip);
 705                 error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
 706                 xfs_iunlock(rbmip, XFS_ILOCK_EXCL);
 707
 708                 if (error == EFSCORRUPTED)
 709                         goto fscorrupt_out;
 710
 711                 ASSERT(vn_count(XFS_ITOV(rbmip)) == 1);
 712
 713                 rsumip = mp->m_rsumip;
 714                 xfs_ilock(rsumip, XFS_ILOCK_EXCL);
 715                 xfs_iflock(rsumip);
 716                 error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
 717                 xfs_iunlock(rsumip, XFS_ILOCK_EXCL);
 718
 719                 if (error == EFSCORRUPTED)
 720                         goto fscorrupt_out;
 721
 722                 ASSERT(vn_count(XFS_ITOV(rsumip)) == 1);
 723         }
 724
 725         /*
 726          * Synchronously flush root inode to disk
 727          */
 728         error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
 729         if (error == EFSCORRUPTED)
 730                 goto fscorrupt_out2;
 731
 732         if (vn_count(rvp) != 1 && !relocation) {
 733                 xfs_iunlock(rip, XFS_ILOCK_EXCL);
 734                 return XFS_ERROR(EBUSY);
 735         }
 736
 737         /*
 738          * Release dquot that rootinode, rbmino and rsumino might be holding,
 739          * flush and purge the quota inodes.
 740          */
 741         error = XFS_QM_UNMOUNT(mp);
 742         if (error == EFSCORRUPTED)
 743                 goto fscorrupt_out2;
 744
 745         if (rbmip) {
 746                 VN_RELE(XFS_ITOV(rbmip));
 747                 VN_RELE(XFS_ITOV(rsumip));
 748         }
 749
 750         xfs_iunlock(rip, XFS_ILOCK_EXCL);
 751         return 0;
 752
 753 fscorrupt_out:
 754         xfs_ifunlock(rip);
 755
 756 fscorrupt_out2:
 757         xfs_iunlock(rip, XFS_ILOCK_EXCL);
 758
 759         return XFS_ERROR(EFSCORRUPTED);
 760 }
 761
 762 /*
 763  * xfs_root extracts the root vnode from a vfs.
 764  *
 765  * vfsp -- the vfs struct for the desired file system
 766  * vpp  -- address of the caller's vnode pointer which should be
 767  *         set to the desired fs root vnode
 768  */
 769 STATIC int
 770 xfs_root(
 771         bhv_desc_t      *bdp,
 772         vnode_t         **vpp)
 773 {
 774         vnode_t         *vp;
 775
 776         vp = XFS_ITOV((XFS_BHVTOM(bdp))->m_rootip);
 777         VN_HOLD(vp);
 778         *vpp = vp;
 779         return 0;
 780 }
 781
 782 /*
 783  * xfs_statvfs
 784  *
 785  * Fill in the statvfs structure for the given file system.  We use
 786  * the superblock lock in the mount structure to ensure a consistent
 787  * snapshot of the counters returned.
 788  */
 789 STATIC int
 790 xfs_statvfs(
 791         bhv_desc_t      *bdp,
 792         xfs_statfs_t    *statp,
 793         vnode_t         *vp)
 794 {
 795         __uint64_t      fakeinos;
 796         xfs_extlen_t    lsize;
 797         xfs_mount_t     *mp;
 798         xfs_sb_t        *sbp;
 799         unsigned long   s;
 800         u64 id;
 801
 802         mp = XFS_BHVTOM(bdp);
 803         sbp = &(mp->m_sb);
 804
 805         statp->f_type = XFS_SB_MAGIC;
 806
 807         s = XFS_SB_LOCK(mp);
 808         statp->f_bsize = sbp->sb_blocksize;
 809         lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
 810         statp->f_blocks = sbp->sb_dblocks - lsize;
 811         statp->f_bfree = statp->f_bavail = sbp->sb_fdblocks;
 812         fakeinos = statp->f_bfree << sbp->sb_inopblog;
 813 #if XFS_BIG_INUMS
 814         fakeinos += mp->m_inoadd;
 815 #endif
 816         statp->f_files =
 817             MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
 818         if (mp->m_maxicount)
 819 #if XFS_BIG_INUMS
 820                 if (!mp->m_inoadd)
 821 #endif
 822                         statp->f_files = min_t(typeof(statp->f_files),
 823                                                 statp->f_files,
 824                                                 mp->m_maxicount);
 825         statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
 826         XFS_SB_UNLOCK(mp, s);
 827
 828         id = huge_encode_dev(mp->m_dev);
 829         statp->f_fsid.val[0] = (u32)id;
 830         statp->f_fsid.val[1] = (u32)(id >> 32);
 831         statp->f_namelen = MAXNAMELEN - 1;
 832
 833         return 0;
 834 }
 835
 836
 837 /*
 838  * xfs_sync flushes any pending I/O to file system vfsp.
 839  *
 840  * This routine is called by vfs_sync() to make sure that things make it
 841  * out to disk eventually, on sync() system calls to flush out everything,
 842  * and when the file system is unmounted.  For the vfs_sync() case, all
 843  * we really need to do is sync out the log to make all of our meta-data
 844  * updates permanent (except for timestamps).  For calls from pflushd(),
 845  * dirty pages are kept moving by calling pdflush() on the inodes
 846  * containing them.  We also flush the inodes that we can lock without
 847  * sleeping and the superblock if we can lock it without sleeping from
 848  * vfs_sync() so that items at the tail of the log are always moving out.
 849  *
 850  * Flags:
 851  *      SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
 852  *                     to sleep if we can help it.  All we really need
 853  *                     to do is ensure that the log is synced at least
 854  *                     periodically.  We also push the inodes and
 855  *                     superblock if we can lock them without sleeping
 856  *                      and they are not pinned.
 857  *      SYNC_ATTR    - We need to flush the inodes.  If SYNC_BDFLUSH is not
 858  *                     set, then we really want to lock each inode and flush
 859  *                     it.
 860  *      SYNC_WAIT    - All the flushes that take place in this call should
 861  *                     be synchronous.
 862  *      SYNC_DELWRI  - This tells us to push dirty pages associated with
 863  *                     inodes.  SYNC_WAIT and SYNC_BDFLUSH are used to
 864  *                     determine if they should be flushed sync, async, or
 865  *                     delwri.
 866  *      SYNC_CLOSE   - This flag is passed when the system is being
 867  *                     unmounted.  We should sync and invalidate everthing.
 868  *      SYNC_FSDATA  - This indicates that the caller would like to make
 869  *                     sure the superblock is safe on disk.  We can ensure
 870  *                     this by simply makeing sure the log gets flushed
 871  *                     if SYNC_BDFLUSH is set, and by actually writing it
 872  *                     out otherwise.
 873  *
 874  */
 875 /*ARGSUSED*/
 876 STATIC int
 877 xfs_sync(
 878         bhv_desc_t      *bdp,
 879         int             flags,
 880         cred_t          *credp)
 881 {
 882         xfs_mount_t     *mp;
 883
 884         mp = XFS_BHVTOM(bdp);
 885         return (xfs_syncsub(mp, flags, 0, NULL));
 886 }
 887
 888 /*
 889  * xfs sync routine for internal use
 890  *
 891  * This routine supports all of the flags defined for the generic VFS_SYNC
 892  * interface as explained above under xfs_sync.  In the interests of not
 893  * changing interfaces within the 6.5 family, additional internallly-
 894  * required functions are specified within a separate xflags parameter,
 895  * only available by calling this routine.
 896  *
 897  */
 898 STATIC int
 899 xfs_sync_inodes(
 900         xfs_mount_t     *mp,
 901         int             flags,
 902         int             xflags,
 903         int             *bypassed)
 904 {
 905         xfs_inode_t     *ip = NULL;
 906         xfs_inode_t     *ip_next;
 907         xfs_buf_t       *bp;
 908         vnode_t         *vp = NULL;
 909         vmap_t          vmap;
 910         int             error;
 911         int             last_error;
 912         uint64_t        fflag;
 913         uint            lock_flags;
 914         uint            base_lock_flags;
 915         boolean_t       mount_locked;
 916         boolean_t       vnode_refed;
 917         int             preempt;
 918         xfs_dinode_t    *dip;
 919         xfs_iptr_t      *ipointer;
 920 #ifdef DEBUG
 921         boolean_t       ipointer_in = B_FALSE;
 922
 923 #define IPOINTER_SET    ipointer_in = B_TRUE
 924 #define IPOINTER_CLR    ipointer_in = B_FALSE
 925 #else
 926 #define IPOINTER_SET
 927 #define IPOINTER_CLR
 928 #endif
 929
 930
 931 /* Insert a marker record into the inode list after inode ip. The list
 932  * must be locked when this is called. After the call the list will no
 933  * longer be locked.
 934  */
 935 #define IPOINTER_INSERT(ip, mp) { \
 936                 ASSERT(ipointer_in == B_FALSE); \
 937                 ipointer->ip_mnext = ip->i_mnext; \
 938                 ipointer->ip_mprev = ip; \
 939                 ip->i_mnext = (xfs_inode_t *)ipointer; \
 940                 ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
 941                 preempt = 0; \
 942                 XFS_MOUNT_IUNLOCK(mp); \
 943                 mount_locked = B_FALSE; \
 944                 IPOINTER_SET; \
 945         }
 946
 947 /* Remove the marker from the inode list. If the marker was the only item
 948  * in the list then there are no remaining inodes and we should zero out
 949  * the whole list. If we are the current head of the list then move the head
 950  * past us.
 951  */
 952 #define IPOINTER_REMOVE(ip, mp) { \
 953                 ASSERT(ipointer_in == B_TRUE); \
 954                 if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
 955                         ip = ipointer->ip_mnext; \
 956                         ip->i_mprev = ipointer->ip_mprev; \
 957                         ipointer->ip_mprev->i_mnext = ip; \
 958                         if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
 959                                 mp->m_inodes = ip; \
 960                         } \
 961                 } else { \
 962                         ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
 963                         mp->m_inodes = NULL; \
 964                         ip = NULL; \
 965                 } \
 966                 IPOINTER_CLR; \
 967         }
 968
 969 #define XFS_PREEMPT_MASK        0x7f
 970
 971         if (bypassed)
 972                 *bypassed = 0;
 973         if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
 974                 return 0;
 975         error = 0;
 976         last_error = 0;
 977         preempt = 0;
 978
 979         /* Allocate a reference marker */
 980         ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
 981
 982         fflag = XFS_B_ASYNC;            /* default is don't wait */
 983         if (flags & SYNC_BDFLUSH)
 984                 fflag = XFS_B_DELWRI;
 985         if (flags & SYNC_WAIT)
 986                 fflag = 0;              /* synchronous overrides all */
 987
 988         base_lock_flags = XFS_ILOCK_SHARED;
 989         if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
 990                 /*
 991                  * We need the I/O lock if we're going to call any of
 992                  * the flush/inval routines.
 993                  */
 994                 base_lock_flags |= XFS_IOLOCK_SHARED;
 995         }
 996
 997         XFS_MOUNT_ILOCK(mp);
 998
 999         ip = mp->m_inodes;
1000
1001         mount_locked = B_TRUE;
1002         vnode_refed  = B_FALSE;
1003
1004         IPOINTER_CLR;
1005
1006         do {
1007                 ASSERT(ipointer_in == B_FALSE);
1008                 ASSERT(vnode_refed == B_FALSE);
1009
1010                 lock_flags = base_lock_flags;
1011
1012                 /*
1013                  * There were no inodes in the list, just break out
1014                  * of the loop.
1015                  */
1016                 if (ip == NULL) {
1017                         break;
1018                 }
1019
1020                 /*
1021                  * We found another sync thread marker - skip it
1022                  */
1023                 if (ip->i_mount == NULL) {
1024                         ip = ip->i_mnext;
1025                         continue;
1026                 }
1027
1028                 vp = XFS_ITOV_NULL(ip);
1029
1030                 /*
1031                  * If the vnode is gone then this is being torn down,
1032                  * call reclaim if it is flushed, else let regular flush
1033                  * code deal with it later in the loop.
1034                  */
1035
1036                 if (vp == NULL) {
1037                         /* Skip ones already in reclaim */
1038                         if (ip->i_flags & XFS_IRECLAIM) {
1039                                 ip = ip->i_mnext;
1040                                 continue;
1041                         }
1042                         if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
1043                                 ip = ip->i_mnext;
1044                         } else if ((xfs_ipincount(ip) == 0) &&
1045                                     xfs_iflock_nowait(ip)) {
1046                                 IPOINTER_INSERT(ip, mp);
1047
1048                                 xfs_finish_reclaim(ip, 1,
1049                                                 XFS_IFLUSH_DELWRI_ELSE_ASYNC);
1050
1051                                 XFS_MOUNT_ILOCK(mp);
1052                                 mount_locked = B_TRUE;
1053                                 IPOINTER_REMOVE(ip, mp);
1054                         } else {
1055                                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1056                                 ip = ip->i_mnext;
1057                         }
1058                         continue;
1059                 }
1060
1061                 if (VN_BAD(vp)) {
1062                         ip = ip->i_mnext;
1063                         continue;
1064                 }
1065
1066                 if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
1067                         XFS_MOUNT_IUNLOCK(mp);
1068                         kmem_free(ipointer, sizeof(xfs_iptr_t));
1069                         return 0;
1070                 }
1071
1072                 /*
1073                  * If this is just vfs_sync() or pflushd() calling
1074                  * then we can skip inodes for which it looks like
1075                  * there is nothing to do.  Since we don't have the
1076                  * inode locked this is racey, but these are periodic
1077                  * calls so it doesn't matter.  For the others we want
1078                  * to know for sure, so we at least try to lock them.
1079                  */
1080                 if (flags & SYNC_BDFLUSH) {
1081                         if (((ip->i_itemp == NULL) ||
1082                              !(ip->i_itemp->ili_format.ilf_fields &
1083                                XFS_ILOG_ALL)) &&
1084                             (ip->i_update_core == 0)) {
1085                                 ip = ip->i_mnext;
1086                                 continue;
1087                         }
1088                 }
1089
1090                 /*
1091                  * Try to lock without sleeping.  We're out of order with
1092                  * the inode list lock here, so if we fail we need to drop
1093                  * the mount lock and try again.  If we're called from
1094                  * bdflush() here, then don't bother.
1095                  *
1096                  * The inode lock here actually coordinates with the
1097                  * almost spurious inode lock in xfs_ireclaim() to prevent
1098                  * the vnode we handle here without a reference from
1099                  * being freed while we reference it.  If we lock the inode
1100                  * while it's on the mount list here, then the spurious inode
1101                  * lock in xfs_ireclaim() after the inode is pulled from
1102                  * the mount list will sleep until we release it here.
1103                  * This keeps the vnode from being freed while we reference
1104                  * it.  It is also cheaper and simpler than actually doing
1105                  * a vn_get() for every inode we touch here.
1106                  */
1107                 if (xfs_ilock_nowait(ip, lock_flags) == 0) {
1108
1109                         if ((flags & SYNC_BDFLUSH) || (vp == NULL)) {
1110                                 ip = ip->i_mnext;
1111                                 continue;
1112                         }
1113
1114                         /*
1115                          * We need to unlock the inode list lock in order
1116                          * to lock the inode. Insert a marker record into
1117                          * the inode list to remember our position, dropping
1118                          * the lock is now done inside the IPOINTER_INSERT
1119                          * macro.
1120                          *
1121                          * We also use the inode list lock to protect us
1122                          * in taking a snapshot of the vnode version number
1123                          * for use in calling vn_get().
1124                          */
1125                         VMAP(vp, vmap);
1126                         IPOINTER_INSERT(ip, mp);
1127
1128                         vp = vn_get(vp, &vmap);
1129                         if (vp == NULL) {
1130                                 /*
1131                                  * The vnode was reclaimed once we let go
1132                                  * of the inode list lock.  Skip to the
1133                                  * next list entry. Remove the marker.
1134                                  */
1135
1136                                 XFS_MOUNT_ILOCK(mp);
1137
1138                                 mount_locked = B_TRUE;
1139                                 vnode_refed  = B_FALSE;
1140
1141                                 IPOINTER_REMOVE(ip, mp);
1142
1143                                 continue;
1144                         }
1145
1146                         xfs_ilock(ip, lock_flags);
1147
1148                         ASSERT(vp == XFS_ITOV(ip));
1149                         ASSERT(ip->i_mount == mp);
1150
1151                         vnode_refed = B_TRUE;
1152                 }
1153
1154                 /* From here on in the loop we may have a marker record
1155                  * in the inode list.
1156                  */
1157
1158                 if ((flags & SYNC_CLOSE)  && (vp != NULL)) {
1159                         /*
1160                          * This is the shutdown case.  We just need to
1161                          * flush and invalidate all the pages associated
1162                          * with the inode.  Drop the inode lock since
1163                          * we can't hold it across calls to the buffer
1164                          * cache.
1165                          *
1166                          * We don't set the VREMAPPING bit in the vnode
1167                          * here, because we don't hold the vnode lock
1168                          * exclusively.  It doesn't really matter, though,
1169                          * because we only come here when we're shutting
1170                          * down anyway.
1171                          */
1172                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1173
1174                         if (XFS_FORCED_SHUTDOWN(mp)) {
1175                                 VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
1176                         } else {
1177                                 VOP_FLUSHINVAL_PAGES(vp, 0, -1, FI_REMAPF);
1178                         }
1179
1180                         xfs_ilock(ip, XFS_ILOCK_SHARED);
1181
1182                 } else if ((flags & SYNC_DELWRI) && (vp != NULL)) {
1183                         if (VN_DIRTY(vp)) {
1184                                 /* We need to have dropped the lock here,
1185                                  * so insert a marker if we have not already
1186                                  * done so.
1187                                  */
1188                                 if (mount_locked) {
1189                                         IPOINTER_INSERT(ip, mp);
1190                                 }
1191
1192                                 /*
1193                                  * Drop the inode lock since we can't hold it
1194                                  * across calls to the buffer cache.
1195                                  */
1196                                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1197                                 VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1,
1198                                                         fflag, FI_NONE, error);
1199                                 xfs_ilock(ip, XFS_ILOCK_SHARED);
1200                         }
1201
1202                 }
1203
1204                 if (flags & SYNC_BDFLUSH) {
1205                         if ((flags & SYNC_ATTR) &&
1206                             ((ip->i_update_core) ||
1207                              ((ip->i_itemp != NULL) &&
1208                               (ip->i_itemp->ili_format.ilf_fields != 0)))) {
1209
1210                                 /* Insert marker and drop lock if not already
1211                                  * done.
1212                                  */
1213                                 if (mount_locked) {
1214                                         IPOINTER_INSERT(ip, mp);
1215                                 }
1216
1217                                 /*
1218                                  * We don't want the periodic flushing of the
1219                                  * inodes by vfs_sync() to interfere with
1220                                  * I/O to the file, especially read I/O
1221                                  * where it is only the access time stamp
1222                                  * that is being flushed out.  To prevent
1223                                  * long periods where we have both inode
1224                                  * locks held shared here while reading the
1225                                  * inode's buffer in from disk, we drop the
1226                                  * inode lock while reading in the inode
1227                                  * buffer.  We have to release the buffer
1228                                  * and reacquire the inode lock so that they
1229                                  * are acquired in the proper order (inode
1230                                  * locks first).  The buffer will go at the
1231                                  * end of the lru chain, though, so we can
1232                                  * expect it to still be there when we go
1233                                  * for it again in xfs_iflush().
1234                                  */
1235                                 if ((xfs_ipincount(ip) == 0) &&
1236                                     xfs_iflock_nowait(ip)) {
1237
1238                                         xfs_ifunlock(ip);
1239                                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1240
1241                                         error = xfs_itobp(mp, NULL, ip,
1242                                                           &dip, &bp, 0);
1243                                         if (!error) {
1244                                                 xfs_buf_relse(bp);
1245                                         } else {
1246                                                 /* Bailing out, remove the
1247                                                  * marker and free it.
1248                                                  */
1249                                                 XFS_MOUNT_ILOCK(mp);
1250
1251                                                 IPOINTER_REMOVE(ip, mp);
1252
1253                                                 XFS_MOUNT_IUNLOCK(mp);
1254
1255                                                 ASSERT(!(lock_flags &
1256                                                         XFS_IOLOCK_SHARED));
1257
1258                                                 kmem_free(ipointer,
1259                                                         sizeof(xfs_iptr_t));
1260                                                 return (0);
1261                                         }
1262
1263                                         /*
1264                                          * Since we dropped the inode lock,
1265                                          * the inode may have been reclaimed.
1266                                          * Therefore, we reacquire the mount
1267                                          * lock and check to see if we were the
1268                                          * inode reclaimed. If this happened
1269                                          * then the ipointer marker will no
1270                                          * longer point back at us. In this
1271                                          * case, move ip along to the inode
1272                                          * after the marker, remove the marker
1273                                          * and continue.
1274                                          */
1275                                         XFS_MOUNT_ILOCK(mp);
1276                                         mount_locked = B_TRUE;
1277
1278                                         if (ip != ipointer->ip_mprev) {
1279                                                 IPOINTER_REMOVE(ip, mp);
1280
1281                                                 ASSERT(!vnode_refed);
1282                                                 ASSERT(!(lock_flags &
1283                                                         XFS_IOLOCK_SHARED));
1284                                                 continue;
1285                                         }
1286
1287                                         ASSERT(ip->i_mount == mp);
1288
1289                                         if (xfs_ilock_nowait(ip,
1290                                                     XFS_ILOCK_SHARED) == 0) {
1291                                                 ASSERT(ip->i_mount == mp);
1292                                                 /*
1293                                                  * We failed to reacquire
1294                                                  * the inode lock without
1295                                                  * sleeping, so just skip
1296                                                  * the inode for now.  We
1297                                                  * clear the ILOCK bit from
1298                                                  * the lock_flags so that we
1299                                                  * won't try to drop a lock
1300                                                  * we don't hold below.
1301                                                  */
1302                                                 lock_flags &= ~XFS_ILOCK_SHARED;
1303                                                 IPOINTER_REMOVE(ip_next, mp);
1304                                         } else if ((xfs_ipincount(ip) == 0) &&
1305                                                    xfs_iflock_nowait(ip)) {
1306                                                 ASSERT(ip->i_mount == mp);
1307                                                 /*
1308                                                  * Since this is vfs_sync()
1309                                                  * calling we only flush the
1310                                                  * inode out if we can lock
1311                                                  * it without sleeping and
1312                                                  * it is not pinned.  Drop
1313                                                  * the mount lock here so
1314                                                  * that we don't hold it for
1315                                                  * too long. We already have
1316                                                  * a marker in the list here.
1317                                                  */
1318                                                 XFS_MOUNT_IUNLOCK(mp);
1319                                                 mount_locked = B_FALSE;
1320                                                 error = xfs_iflush(ip,
1321                                                            XFS_IFLUSH_DELWRI);
1322                                         } else {
1323                                                 ASSERT(ip->i_mount == mp);
1324                                                 IPOINTER_REMOVE(ip_next, mp);
1325                                         }
1326                                 }
1327
1328                         }
1329
1330                 } else {
1331                         if ((flags & SYNC_ATTR) &&
1332                             ((ip->i_update_core) ||
1333                              ((ip->i_itemp != NULL) &&
1334                               (ip->i_itemp->ili_format.ilf_fields != 0)))) {
1335                                 if (mount_locked) {
1336                                         IPOINTER_INSERT(ip, mp);
1337                                 }
1338
1339                                 if (flags & SYNC_WAIT) {
1340                                         xfs_iflock(ip);
1341                                         error = xfs_iflush(ip,
1342                                                            XFS_IFLUSH_SYNC);
1343                                 } else {
1344                                         /*
1345                                          * If we can't acquire the flush
1346                                          * lock, then the inode is already
1347                                          * being flushed so don't bother
1348                                          * waiting.  If we can lock it then
1349                                          * do a delwri flush so we can
1350                                          * combine multiple inode flushes
1351                                          * in each disk write.
1352                                          */
1353                                         if (xfs_iflock_nowait(ip)) {
1354                                                 error = xfs_iflush(ip,
1355                                                            XFS_IFLUSH_DELWRI);
1356                                         }
1357                                         else if (bypassed)
1358                                                 (*bypassed)++;
1359                                 }
1360                         }
1361                 }
1362
1363                 if (lock_flags != 0) {
1364                         xfs_iunlock(ip, lock_flags);
1365                 }
1366
1367                 if (vnode_refed) {
1368                         /*
1369                          * If we had to take a reference on the vnode
1370                          * above, then wait until after we've unlocked
1371                          * the inode to release the reference.  This is
1372                          * because we can be already holding the inode
1373                          * lock when VN_RELE() calls xfs_inactive().
1374                          *
1375                          * Make sure to drop the mount lock before calling
1376                          * VN_RELE() so that we don't trip over ourselves if
1377                          * we have to go for the mount lock again in the
1378                          * inactive code.
1379                          */
1380                         if (mount_locked) {
1381                                 IPOINTER_INSERT(ip, mp);
1382                         }
1383
1384                         VN_RELE(vp);
1385
1386                         vnode_refed = B_FALSE;
1387                 }
1388
1389                 if (error) {
1390                         last_error = error;
1391                 }
1392
1393                 /*
1394                  * bail out if the filesystem is corrupted.
1395                  */
1396                 if (error == EFSCORRUPTED)  {
1397                         if (!mount_locked) {
1398                                 XFS_MOUNT_ILOCK(mp);
1399                                 IPOINTER_REMOVE(ip, mp);
1400                         }
1401                         XFS_MOUNT_IUNLOCK(mp);
1402                         ASSERT(ipointer_in == B_FALSE);
1403                         kmem_free(ipointer, sizeof(xfs_iptr_t));
1404                         return XFS_ERROR(error);
1405                 }
1406
1407                 /* Let other threads have a chance at the mount lock
1408                  * if we have looped many times without dropping the
1409                  * lock.
1410                  */
1411                 if ((++preempt & XFS_PREEMPT_MASK) == 0) {
1412                         if (mount_locked) {
1413                                 IPOINTER_INSERT(ip, mp);
1414                         }
1415                 }
1416
1417                 if (mount_locked == B_FALSE) {
1418                         XFS_MOUNT_ILOCK(mp);
1419                         mount_locked = B_TRUE;
1420                         IPOINTER_REMOVE(ip, mp);
1421                         continue;
1422                 }
1423
1424                 ASSERT(ipointer_in == B_FALSE);
1425                 ip = ip->i_mnext;
1426
1427         } while (ip != mp->m_inodes);
1428
1429         XFS_MOUNT_IUNLOCK(mp);
1430
1431         ASSERT(ipointer_in == B_FALSE);
1432
1433         kmem_free(ipointer, sizeof(xfs_iptr_t));
1434         return XFS_ERROR(last_error);
1435 }
1436
1437 /*
1438  * xfs sync routine for internal use
1439  *
1440  * This routine supports all of the flags defined for the generic VFS_SYNC
1441  * interface as explained above under xfs_sync.  In the interests of not
1442  * changing interfaces within the 6.5 family, additional internallly-
1443  * required functions are specified within a separate xflags parameter,
1444  * only available by calling this routine.
1445  *
1446  */
1447 int
1448 xfs_syncsub(
1449         xfs_mount_t     *mp,
1450         int             flags,
1451         int             xflags,
1452         int             *bypassed)
1453 {
1454         int             error = 0;
1455         int             last_error = 0;
1456         uint            log_flags = XFS_LOG_FORCE;
1457         xfs_buf_t       *bp;
1458         xfs_buf_log_item_t      *bip;
1459
1460         /*
1461          * Sync out the log.  This ensures that the log is periodically
1462          * flushed even if there is not enough activity to fill it up.
1463          */
1464         if (flags & SYNC_WAIT)
1465                 log_flags |= XFS_LOG_SYNC;
1466
1467         xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1468
1469         if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
1470                 if (flags & SYNC_BDFLUSH)
1471                         xfs_finish_reclaim_all(mp, 1);
1472                 else
1473                         error = xfs_sync_inodes(mp, flags, xflags, bypassed);
1474         }
1475
1476         /*
1477          * Flushing out dirty data above probably generated more
1478          * log activity, so if this isn't vfs_sync() then flush
1479          * the log again.
1480          */
1481         if (flags & SYNC_DELWRI) {
1482                 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1483         }
1484
1485         if (flags & SYNC_FSDATA) {
1486                 /*
1487                  * If this is vfs_sync() then only sync the superblock
1488                  * if we can lock it without sleeping and it is not pinned.
1489                  */
1490                 if (flags & SYNC_BDFLUSH) {
1491                         bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
1492                         if (bp != NULL) {
1493                                 bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
1494                                 if ((bip != NULL) &&
1495                                     xfs_buf_item_dirty(bip)) {
1496                                         if (!(XFS_BUF_ISPINNED(bp))) {
1497                                                 XFS_BUF_ASYNC(bp);
1498                                                 error = xfs_bwrite(mp, bp);
1499                                         } else {
1500                                                 xfs_buf_relse(bp);
1501                                         }
1502                                 } else {
1503                                         xfs_buf_relse(bp);
1504                                 }
1505                         }
1506                 } else {
1507                         bp = xfs_getsb(mp, 0);
1508                         /*
1509                          * If the buffer is pinned then push on the log so
1510                          * we won't get stuck waiting in the write for
1511                          * someone, maybe ourselves, to flush the log.
1512                          * Even though we just pushed the log above, we
1513                          * did not have the superblock buffer locked at
1514                          * that point so it can become pinned in between
1515                          * there and here.
1516                          */
1517                         if (XFS_BUF_ISPINNED(bp))
1518                                 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
1519                         if (flags & SYNC_WAIT)
1520                                 XFS_BUF_UNASYNC(bp);
1521                         else
1522                                 XFS_BUF_ASYNC(bp);
1523                         error = xfs_bwrite(mp, bp);
1524                 }
1525                 if (error) {
1526                         last_error = error;
1527                 }
1528         }
1529
1530         /*
1531          * If this is the periodic sync, then kick some entries out of
1532          * the reference cache.  This ensures that idle entries are
1533          * eventually kicked out of the cache.
1534          */
1535         if (flags & SYNC_REFCACHE) {
1536                 xfs_refcache_purge_some(mp);
1537         }
1538
1539         /*
1540          * Now check to see if the log needs a "dummy" transaction.
1541          */
1542
1543         if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
1544                 xfs_trans_t *tp;
1545                 xfs_inode_t *ip;
1546
1547                 /*
1548                  * Put a dummy transaction in the log to tell
1549                  * recovery that all others are OK.
1550                  */
1551                 tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
1552                 if ((error = xfs_trans_reserve(tp, 0,
1553                                 XFS_ICHANGE_LOG_RES(mp),
1554                                 0, 0, 0)))  {
1555                         xfs_trans_cancel(tp, 0);
1556                         return error;
1557                 }
1558
1559                 ip = mp->m_rootip;
1560                 xfs_ilock(ip, XFS_ILOCK_EXCL);
1561
1562                 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1563                 xfs_trans_ihold(tp, ip);
1564                 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1565                 error = xfs_trans_commit(tp, 0, NULL);
1566                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1567                 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1568         }
1569
1570         /*
1571          * When shutting down, we need to insure that the AIL is pushed
1572          * to disk or the filesystem can appear corrupt from the PROM.
1573          */
1574         if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
1575                 XFS_bflush(mp->m_ddev_targp);
1576                 if (mp->m_rtdev_targp) {
1577                         XFS_bflush(mp->m_rtdev_targp);
1578                 }
1579         }
1580
1581         return XFS_ERROR(last_error);
1582 }
1583
1584 /*
1585  * xfs_vget - called by DMAPI and NFSD to get vnode from file handle
1586  */
1587 STATIC int
1588 xfs_vget(
1589         bhv_desc_t      *bdp,
1590         vnode_t         **vpp,
1591         fid_t           *fidp)
1592 {
1593         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
1594         xfs_fid_t       *xfid = (struct xfs_fid *)fidp;
1595         xfs_inode_t     *ip;
1596         int             error;
1597         xfs_ino_t       ino;
1598         unsigned int    igen;
1599
1600         /*
1601          * Invalid.  Since handles can be created in user space and passed in
1602          * via gethandle(), this is not cause for a panic.
1603          */
1604         if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
1605                 return XFS_ERROR(EINVAL);
1606
1607         ino  = xfid->xfs_fid_ino;
1608         igen = xfid->xfs_fid_gen;
1609
1610         /*
1611          * NFS can sometimes send requests for ino 0.  Fail them gracefully.
1612          */
1613         if (ino == 0)
1614                 return XFS_ERROR(ESTALE);
1615
1616         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
1617         if (error) {
1618                 *vpp = NULL;
1619                 return error;
1620         }
1621
1622         if (ip == NULL) {
1623                 *vpp = NULL;
1624                 return XFS_ERROR(EIO);
1625         }
1626
1627         if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
1628                 xfs_iput_new(ip, XFS_ILOCK_SHARED);
1629                 *vpp = NULL;
1630                 return XFS_ERROR(ENOENT);
1631         }
1632
1633         *vpp = XFS_ITOV(ip);
1634         xfs_iunlock(ip, XFS_ILOCK_SHARED);
1635         return 0;
1636 }
1637
1638
1639 #define MNTOPT_LOGBUFS  "logbufs"       /* number of XFS log buffers */
1640 #define MNTOPT_LOGBSIZE "logbsize"      /* size of XFS log buffers */
1641 #define MNTOPT_LOGDEV   "logdev"        /* log device */
1642 #define MNTOPT_RTDEV    "rtdev"         /* realtime I/O device */
1643 #define MNTOPT_BIOSIZE  "biosize"       /* log2 of preferred buffered io size */
1644 #define MNTOPT_WSYNC    "wsync"         /* safe-mode nfs compatible mount */
1645 #define MNTOPT_INO64    "ino64"         /* force inodes into 64-bit range */
1646 #define MNTOPT_NOALIGN  "noalign"       /* turn off stripe alignment */
1647 #define MNTOPT_SWALLOC  "swalloc"       /* turn on stripe width allocation */
1648 #define MNTOPT_SUNIT    "sunit"         /* data volume stripe unit */
1649 #define MNTOPT_SWIDTH   "swidth"        /* data volume stripe width */
1650 #define MNTOPT_NOUUID   "nouuid"        /* ignore filesystem UUID */
1651 #define MNTOPT_MTPT     "mtpt"          /* filesystem mount point */
1652 #define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
1653 #define MNTOPT_IHASHSIZE    "ihashsize"    /* size of inode hash table */
1654 #define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
1655 #define MNTOPT_NOLOGFLUSH   "nologflush"   /* don't hard flush on log writes */
1656 #define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
1657 #define MNTOPT_64BITINODE   "inode64"   /* inodes can be allocated anywhere */
1658 #define MNTOPT_IKEEP    "ikeep"         /* do not free empty inode clusters */
1659 #define MNTOPT_NOIKEEP  "noikeep"       /* free empty inode clusters */
1660
1661 STATIC unsigned long
1662 suffix_strtoul(const char *cp, char **endp, unsigned int base)
1663 {
1664         int     last, shift_left_factor = 0;
1665         char    *value = (char *)cp;
1666
1667         last = strlen(value) - 1;
1668         if (value[last] == 'K' || value[last] == 'k') {
1669                 shift_left_factor = 10;
1670                 value[last] = '\0';
1671         }
1672         if (value[last] == 'M' || value[last] == 'm') {
1673                 shift_left_factor = 20;
1674                 value[last] = '\0';
1675         }
1676         if (value[last] == 'G' || value[last] == 'g') {
1677                 shift_left_factor = 30;
1678                 value[last] = '\0';
1679         }
1680
1681         return simple_strtoul(cp, endp, base) << shift_left_factor;
1682 }
1683
1684 STATIC int
1685 xfs_parseargs(
1686         struct bhv_desc         *bhv,
1687         char                    *options,
1688         struct xfs_mount_args   *args,
1689         int                     update)
1690 {
1691         struct vfs              *vfsp = bhvtovfs(bhv);
1692         char                    *this_char, *value, *eov;
1693         int                     dsunit, dswidth, vol_dsunit, vol_dswidth;
1694         int                     iosize;
1695
1696 #if 0   /* XXX: off by default, until some remaining issues ironed out */
1697         args->flags |= XFSMNT_IDELETE; /* default to on */
1698 #endif
1699
1700         if (!options)
1701                 return 0;
1702
1703         iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;
1704
1705         while ((this_char = strsep(&options, ",")) != NULL) {
1706                 if (!*this_char)
1707                         continue;
1708                 if ((value = strchr(this_char, '=')) != NULL)
1709                         *value++ = 0;
1710
1711                 if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
1712                         if (!value || !*value) {
1713                                 printk("XFS: %s option requires an argument\n",
1714                                         this_char);
1715                                 return EINVAL;
1716                         }
1717                         args->logbufs = simple_strtoul(value, &eov, 10);
1718                 } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
1719                         if (!value || !*value) {
1720                                 printk("XFS: %s option requires an argument\n",
1721                                         this_char);
1722                                 return EINVAL;
1723                         }
1724                         args->logbufsize = suffix_strtoul(value, &eov, 10);
1725                 } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
1726                         if (!value || !*value) {
1727                                 printk("XFS: %s option requires an argument\n",
1728                                         this_char);
1729                                 return EINVAL;
1730                         }
1731                         strncpy(args->logname, value, MAXNAMELEN);
1732                 } else if (!strcmp(this_char, MNTOPT_MTPT)) {
1733                         if (!value || !*value) {
1734                                 printk("XFS: %s option requires an argument\n",
1735                                         this_char);
1736                                 return EINVAL;
1737                         }
1738                         strncpy(args->mtpt, value, MAXNAMELEN);
1739                 } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
1740                         if (!value || !*value) {
1741                                 printk("XFS: %s option requires an argument\n",
1742                                         this_char);
1743                                 return EINVAL;
1744                         }
1745                         strncpy(args->rtname, value, MAXNAMELEN);
1746                 } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
1747                         if (!value || !*value) {
1748                                 printk("XFS: %s option requires an argument\n",
1749                                         this_char);
1750                                 return EINVAL;
1751                         }
1752                         iosize = simple_strtoul(value, &eov, 10);
1753                         args->flags |= XFSMNT_IOSIZE;
1754                         args->iosizelog = (uint8_t) iosize;
1755                 } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
1756                         if (!value || !*value) {
1757                                 printk("XFS: %s option requires an argument\n",
1758                                         this_char);
1759                                 return EINVAL;
1760                         }
1761                         iosize = suffix_strtoul(value, &eov, 10);
1762                         args->flags |= XFSMNT_IOSIZE;
1763                         args->iosizelog = ffs(iosize) - 1;
1764                 } else if (!strcmp(this_char, MNTOPT_IHASHSIZE)) {
1765                         if (!value || !*value) {
1766                                 printk("XFS: %s option requires an argument\n",
1767                                         this_char);
1768                                 return EINVAL;
1769                         }
1770                         args->flags |= XFSMNT_IHASHSIZE;
1771                         args->ihashsize = simple_strtoul(value, &eov, 10);
1772                 } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
1773                         args->flags |= XFSMNT_WSYNC;
1774                 } else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
1775                         args->flags |= XFSMNT_OSYNCISOSYNC;
1776                 } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
1777                         args->flags |= XFSMNT_NORECOVERY;
1778                 } else if (!strcmp(this_char, MNTOPT_INO64)) {
1779                         args->flags |= XFSMNT_INO64;
1780 #if !XFS_BIG_INUMS
1781                         printk("XFS: %s option not allowed on this system\n",
1782                                 this_char);
1783                         return EINVAL;
1784 #endif
1785                 } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
1786                         args->flags |= XFSMNT_NOALIGN;
1787                 } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
1788                         args->flags |= XFSMNT_SWALLOC;
1789                 } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
1790                         if (!value || !*value) {
1791                                 printk("XFS: %s option requires an argument\n",
1792                                         this_char);
1793                                 return EINVAL;
1794                         }
1795                         dsunit = simple_strtoul(value, &eov, 10);
1796                 } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
1797                         if (!value || !*value) {
1798                                 printk("XFS: %s option requires an argument\n",
1799                                         this_char);
1800                                 return EINVAL;
1801                         }
1802                         dswidth = simple_strtoul(value, &eov, 10);
1803                 } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
1804                         args->flags &= ~XFSMNT_32BITINODES;
1805 #if !XFS_BIG_INUMS
1806                         printk("XFS: %s option not allowed on this system\n",
1807                                 this_char);
1808                         return EINVAL;
1809 #endif
1810                 } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
1811                         args->flags |= XFSMNT_NOUUID;
1812                 } else if (!strcmp(this_char, MNTOPT_NOLOGFLUSH)) {
1813                         args->flags |= XFSMNT_NOLOGFLUSH;
1814                 } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
1815                         args->flags &= ~XFSMNT_IDELETE;
1816                 } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
1817                         args->flags |= XFSMNT_IDELETE;
1818                 } else if (!strcmp(this_char, "osyncisdsync")) {
1819                         /* no-op, this is now the default */
1820 printk("XFS: osyncisdsync is now the default, option is deprecated.\n");
1821                 } else if (!strcmp(this_char, "irixsgid")) {
1822 printk("XFS: irixsgid is now a sysctl(2) variable, option is deprecated.\n");
1823                 } else {
1824                         printk("XFS: unknown mount option [%s].\n", this_char);
1825                         return EINVAL;
1826                 }
1827         }
1828
1829         if (args->flags & XFSMNT_NORECOVERY) {
1830                 if ((vfsp->vfs_flag & VFS_RDONLY) == 0) {
1831                         printk("XFS: no-recovery mounts must be read-only.\n");
1832                         return EINVAL;
1833                 }
1834         }
1835
1836         if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
1837                 printk(
1838         "XFS: sunit and swidth options incompatible with the noalign option\n");
1839                 return EINVAL;
1840         }
1841
1842         if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
1843                 printk("XFS: sunit and swidth must be specified together\n");
1844                 return EINVAL;
1845         }
1846
1847         if (dsunit && (dswidth % dsunit != 0)) {
1848                 printk(
1849         "XFS: stripe width (%d) must be a multiple of the stripe unit (%d)\n",
1850                         dswidth, dsunit);
1851                 return EINVAL;
1852         }
1853
1854         if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
1855                 if (dsunit) {
1856                         args->sunit = dsunit;
1857                         args->flags |= XFSMNT_RETERR;
1858                 } else {
1859                         args->sunit = vol_dsunit;
1860                 }
1861                 dswidth ? (args->swidth = dswidth) :
1862                           (args->swidth = vol_dswidth);
1863         } else {
1864                 args->sunit = args->swidth = 0;
1865         }
1866
1867         return 0;
1868 }
1869
1870 STATIC int
1871 xfs_showargs(
1872         struct bhv_desc         *bhv,
1873         struct seq_file         *m)
1874 {
1875         static struct proc_xfs_info {
1876                 int     flag;
1877                 char    *str;
1878         } xfs_info[] = {
1879                 /* the few simple ones we can get from the mount struct */
1880                 { XFS_MOUNT_WSYNC,              "," MNTOPT_WSYNC },
1881                 { XFS_MOUNT_INO64,              "," MNTOPT_INO64 },
1882                 { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
1883                 { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
1884                 { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
1885                 { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
1886                 { XFS_MOUNT_OSYNCISOSYNC,       "," MNTOPT_OSYNCISOSYNC },
1887                 { XFS_MOUNT_NOLOGFLUSH,         "," MNTOPT_NOLOGFLUSH },
1888                 { XFS_MOUNT_IDELETE,            "," MNTOPT_NOIKEEP },
1889                 { 0, NULL }
1890         };
1891         struct proc_xfs_info    *xfs_infop;
1892         struct xfs_mount        *mp = XFS_BHVTOM(bhv);
1893
1894         for (xfs_infop = xfs_info; xfs_infop->flag; xfs_infop++) {
1895                 if (mp->m_flags & xfs_infop->flag)
1896                         seq_puts(m, xfs_infop->str);
1897         }
1898
1899         if (mp->m_flags & XFS_MOUNT_IHASHSIZE)
1900                 seq_printf(m, "," MNTOPT_IHASHSIZE "=%d", mp->m_ihsize);
1901
1902         if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
1903                 seq_printf(m, "," MNTOPT_ALLOCSIZE "=%d", 1<<mp->m_writeio_log);
1904
1905         if (mp->m_logbufs > 0)
1906                 seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
1907
1908         if (mp->m_logbsize > 0)
1909                 seq_printf(m, "," MNTOPT_LOGBSIZE "=%d", mp->m_logbsize);
1910
1911         if (mp->m_ddev_targp != mp->m_logdev_targp)
1912                 seq_printf(m, "," MNTOPT_LOGDEV "=%s",
1913                                 XFS_BUFTARG_NAME(mp->m_logdev_targp));
1914
1915         if (mp->m_rtdev_targp && mp->m_ddev_targp != mp->m_rtdev_targp)
1916                 seq_printf(m, "," MNTOPT_RTDEV "=%s",
1917                                 XFS_BUFTARG_NAME(mp->m_rtdev_targp));
1918
1919         if (mp->m_dalign > 0)
1920                 seq_printf(m, "," MNTOPT_SUNIT "=%d",
1921                                 (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
1922
1923         if (mp->m_swidth > 0)
1924                 seq_printf(m, "," MNTOPT_SWIDTH "=%d",
1925                                 (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
1926
1927         if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT))
1928                 seq_printf(m, "," MNTOPT_64BITINODE);
1929
1930         return 0;
1931 }
1932
1933 STATIC void
1934 xfs_freeze(
1935         bhv_desc_t      *bdp)
1936 {
1937         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
1938
1939         while (atomic_read(&mp->m_active_trans) > 0)
1940                 delay(100);
1941
1942         /* Push the superblock and write an unmount record */
1943         xfs_log_unmount_write(mp);
1944         xfs_unmountfs_writesb(mp);
1945 }
1946
1947
1948 vfsops_t xfs_vfsops = {
1949         BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS),
1950         .vfs_parseargs          = xfs_parseargs,
1951         .vfs_showargs           = xfs_showargs,
1952         .vfs_mount              = xfs_mount,
1953         .vfs_unmount            = xfs_unmount,
1954         .vfs_mntupdate          = xfs_mntupdate,
1955         .vfs_root               = xfs_root,
1956         .vfs_statvfs            = xfs_statvfs,
1957         .vfs_sync               = xfs_sync,
1958         .vfs_vget               = xfs_vget,
1959         .vfs_dmapiops           = (vfs_dmapiops_t)fs_nosys,
1960         .vfs_quotactl           = (vfs_quotactl_t)fs_nosys,
1961         .vfs_init_vnode         = xfs_initialize_vnode,
1962         .vfs_force_shutdown     = xfs_do_force_shutdown,
1963         .vfs_freeze             = xfs_freeze,
1964 };