aboutsummaryrefslogblamecommitdiffstats
path: root/fs/xfs/xfs_vfsops.c
blob: b6ad370fab3d839d7ff792ca9c03a33bf17a8b3f (plain) (tree)
1
2
3
4
5
6
7
8
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
  

                                                 
  

                                                                 

                                             



                                                                   
  


                                                                       
   
                
                   
                      
                    
                    
                     

                      
                   



                      
                         


                             

                        
                        
                       
                      




                           

                      


                         
                         
                           
                             


                     
                      
































































































































































                                                                                                
                               








                                                                       
                                   














                                                                     







                                                                              










                                                 

                                                

                                                 

                                                 

                                                      
                                           
                                                     
















                                                                     

                                                 

                                                 

                                               
 


                                                       













                                                                 

                                                 

                                                  

















                                                                          
                                            

                                                                     

                                                                   












                                                                             



                                                 









                                                                  














































































































































                                                                                
                                                                                

                                               
                                              


                            

                 

































































































                                                                               



























                                                                           








                                               
                              





                                                  




                                                  





                                                       

         



                                                                                
                                   




                                                        





























































































































                                                                             


























                                                                           
                                    


















































                                                                            
                                              
 



                                                       











                                                                          
   









                                   








































































                                                                            
                                                 























































































































                                                                              
                      

                                                            




                                                                     
                                         
                                         
                                                 


                                         
                                                





































































































































































































































































































































































































                                                                                



                                                    


















































































































                                                                                



                                                                               
                                                                          

                                                                         
                                                                                
                                                                         
                                                        



                                                                              


                                                                              

                                                                               
 





















                                                                   
 
          










                                                                         
                                              
 




                                                                         
                          











                                                                               
                                                   



                                                                        

                                                                               
                                                   

                                              
                                                                           


                                                                               
                                                   





                                                                               
                                                   





                                                                               
                                                   





                                                                               
                                                   




                                                                 








                                                                               


                                                                               
                                                   



                                                                          





                                                                   









                                                                             
                                           








                                                                               
                                                   





                                                                               
                                                   






                                                                             
                                           



                                                               

                                                                

                                                                  



                                                                
                                                                
                                                               
                                                                  
                                                              
                                                              
                                                    
                                                                
                                                     
















































                                                                                
     

                                                  

                                             


                 
          















                                                                          




                                                                     
                                                       









                                                                        

                                                                     


                                                                       
                               
                                                                                
 

                                                                      

                                                                    



                                                                      



                                                                      

                                                     

                                                  
 

                                                     


                                                














                                                             
                             



















                                                           
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_quota.h"
#include "xfs_error.h"
#include "xfs_bmap.h"
#include "xfs_rw.h"
#include "xfs_refcache.h"
#include "xfs_buf_item.h"
#include "xfs_log_priv.h"
#include "xfs_dir2_trace.h"
#include "xfs_extfree_item.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_clnt.h"
#include "xfs_fsops.h"

STATIC int xfs_sync(bhv_desc_t *, int, cred_t *);

int
xfs_init(void)
{
	extern kmem_zone_t	*xfs_bmap_free_item_zone;
	extern kmem_zone_t	*xfs_btree_cur_zone;
	extern kmem_zone_t	*xfs_trans_zone;
	extern kmem_zone_t	*xfs_buf_item_zone;
	extern kmem_zone_t	*xfs_dabuf_zone;
#ifdef XFS_DABUF_DEBUG
	extern lock_t	        xfs_dabuf_global_lock;
	spinlock_init(&xfs_dabuf_global_lock, "xfsda");
#endif

	/*
	 * Initialize all of the zone allocators we use.
	 */
	xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
						 "xfs_bmap_free_item");
	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
					    "xfs_btree_cur");
	xfs_inode_zone = kmem_zone_init(sizeof(xfs_inode_t), "xfs_inode");
	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
	xfs_da_state_zone =
		kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
	xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");

	/*
	 * The size of the zone allocated buf log item is the maximum
	 * size possible under XFS.  This wastes a little bit of memory,
	 * but it is much faster.
	 */
	xfs_buf_item_zone =
		kmem_zone_init((sizeof(xfs_buf_log_item_t) +
				(((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
				  NBWORD) * sizeof(int))),
			       "xfs_buf_item");
	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
				       ((XFS_EFD_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
				      "xfs_efd_item");
	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
				       ((XFS_EFI_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))),
				      "xfs_efi_item");
	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
	xfs_ili_zone = kmem_zone_init(sizeof(xfs_inode_log_item_t), "xfs_ili");
	xfs_chashlist_zone = kmem_zone_init(sizeof(xfs_chashlist_t),
					    "xfs_chashlist");
	xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");

	/*
	 * Allocate global trace buffers.
	 */
#ifdef XFS_ALLOC_TRACE
	xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMAP_TRACE
	xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMBT_TRACE
	xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_DIR_TRACE
	xfs_dir_trace_buf = ktrace_alloc(XFS_DIR_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_ATTR_TRACE
	xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_DIR2_TRACE
	xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP);
#endif

	xfs_dir_startup();

#if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
	xfs_error_test_init();
#endif /* DEBUG || INDUCE_IO_ERROR */

	xfs_init_procfs();
	xfs_sysctl_register();
	return 0;
}

void
xfs_cleanup(void)
{
	extern kmem_zone_t	*xfs_bmap_free_item_zone;
	extern kmem_zone_t	*xfs_btree_cur_zone;
	extern kmem_zone_t	*xfs_inode_zone;
	extern kmem_zone_t	*xfs_trans_zone;
	extern kmem_zone_t	*xfs_da_state_zone;
	extern kmem_zone_t	*xfs_dabuf_zone;
	extern kmem_zone_t	*xfs_efd_zone;
	extern kmem_zone_t	*xfs_efi_zone;
	extern kmem_zone_t	*xfs_buf_item_zone;
	extern kmem_zone_t	*xfs_chashlist_zone;

	xfs_cleanup_procfs();
	xfs_sysctl_unregister();
	xfs_refcache_destroy();
	xfs_acl_zone_destroy(xfs_acl_zone);

#ifdef XFS_DIR2_TRACE
	ktrace_free(xfs_dir2_trace_buf);
#endif
#ifdef XFS_ATTR_TRACE
	ktrace_free(xfs_attr_trace_buf);
#endif
#ifdef XFS_DIR_TRACE
	ktrace_free(xfs_dir_trace_buf);
#endif
#ifdef XFS_BMBT_TRACE
	ktrace_free(xfs_bmbt_trace_buf);
#endif
#ifdef XFS_BMAP_TRACE
	ktrace_free(xfs_bmap_trace_buf);
#endif
#ifdef XFS_ALLOC_TRACE
	ktrace_free(xfs_alloc_trace_buf);
#endif

	kmem_cache_destroy(xfs_bmap_free_item_zone);
	kmem_cache_destroy(xfs_btree_cur_zone);
	kmem_cache_destroy(xfs_inode_zone);
	kmem_cache_destroy(xfs_trans_zone);
	kmem_cache_destroy(xfs_da_state_zone);
	kmem_cache_destroy(xfs_dabuf_zone);
	kmem_cache_destroy(xfs_buf_item_zone);
	kmem_cache_destroy(xfs_efd_zone);
	kmem_cache_destroy(xfs_efi_zone);
	kmem_cache_destroy(xfs_ifork_zone);
	kmem_cache_destroy(xfs_ili_zone);
	kmem_cache_destroy(xfs_chashlist_zone);
}

/*
 * xfs_start_flags
 *
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock has _not_ yet been read in.
 */
STATIC int
xfs_start_flags(
	struct vfs		*vfs,
	struct xfs_mount_args	*ap,
	struct xfs_mount	*mp)
{
	/* Values are in BBs */
	if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
		/*
		 * At this point the superblock has not been read
		 * in, therefore we do not know the block size.
		 * Before the mount call ends we will convert
		 * these to FSBs.
		 */
		mp->m_dalign = ap->sunit;
		mp->m_swidth = ap->swidth;
	}

	if (ap->logbufs != -1 &&
	    ap->logbufs != 0 &&
	    (ap->logbufs < XLOG_MIN_ICLOGS ||
	     ap->logbufs > XLOG_MAX_ICLOGS)) {
		cmn_err(CE_WARN,
			"XFS: invalid logbufs value: %d [not %d-%d]",
			ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
		return XFS_ERROR(EINVAL);
	}
	mp->m_logbufs = ap->logbufs;
	if (ap->logbufsize != -1 &&
	    ap->logbufsize !=  0 &&
	    ap->logbufsize != 16 * 1024 &&
	    ap->logbufsize != 32 * 1024 &&
	    ap->logbufsize != 64 * 1024 &&
	    ap->logbufsize != 128 * 1024 &&
	    ap->logbufsize != 256 * 1024) {
		cmn_err(CE_WARN,
	"XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
			ap->logbufsize);
		return XFS_ERROR(EINVAL);
	}
	mp->m_ihsize = ap->ihashsize;
	mp->m_logbsize = ap->logbufsize;
	mp->m_fsname_len = strlen(ap->fsname) + 1;
	mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
	strcpy(mp->m_fsname, ap->fsname);
	if (ap->rtname[0]) {
		mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
		strcpy(mp->m_rtname, ap->rtname);
	}
	if (ap->logname[0]) {
		mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
		strcpy(mp->m_logname, ap->logname);
	}

	if (ap->flags & XFSMNT_WSYNC)
		mp->m_flags |= XFS_MOUNT_WSYNC;
#if XFS_BIG_INUMS
	if (ap->flags & XFSMNT_INO64) {
		mp->m_flags |= XFS_MOUNT_INO64;
		mp->m_inoadd = XFS_INO64_OFFSET;
	}
#endif
	if (ap->flags & XFSMNT_NOATIME)
		mp->m_flags |= XFS_MOUNT_NOATIME;
	if (ap->flags & XFSMNT_RETERR)
		mp->m_flags |= XFS_MOUNT_RETERR;
	if (ap->flags & XFSMNT_NOALIGN)
		mp->m_flags |= XFS_MOUNT_NOALIGN;
	if (ap->flags & XFSMNT_SWALLOC)
		mp->m_flags |= XFS_MOUNT_SWALLOC;
	if (ap->flags & XFSMNT_OSYNCISOSYNC)
		mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
	if (ap->flags & XFSMNT_32BITINODES)
		mp->m_flags |= XFS_MOUNT_32BITINODES;

	if (ap->flags & XFSMNT_IOSIZE) {
		if (ap->iosizelog > XFS_MAX_IO_LOG ||
		    ap->iosizelog < XFS_MIN_IO_LOG) {
			cmn_err(CE_WARN,
		"XFS: invalid log iosize: %d [not %d-%d]",
				ap->iosizelog, XFS_MIN_IO_LOG,
				XFS_MAX_IO_LOG);
			return XFS_ERROR(EINVAL);
		}

		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
		mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
	}

	if (ap->flags & XFSMNT_IHASHSIZE)
		mp->m_flags |= XFS_MOUNT_IHASHSIZE;
	if (ap->flags & XFSMNT_IDELETE)
		mp->m_flags |= XFS_MOUNT_IDELETE;
	if (ap->flags & XFSMNT_DIRSYNC)
		mp->m_flags |= XFS_MOUNT_DIRSYNC;
	if (ap->flags & XFSMNT_ATTR2)
		mp->m_flags |= XFS_MOUNT_ATTR2;

	if (ap->flags2 & XFSMNT2_COMPAT_IOSIZE)
		mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;

	/*
	 * no recovery flag requires a read-only mount
	 */
	if (ap->flags & XFSMNT_NORECOVERY) {
		if (!(vfs->vfs_flag & VFS_RDONLY)) {
			cmn_err(CE_WARN,
	"XFS: tried to mount a FS read-write without recovery!");
			return XFS_ERROR(EINVAL);
		}
		mp->m_flags |= XFS_MOUNT_NORECOVERY;
	}

	if (ap->flags & XFSMNT_NOUUID)
		mp->m_flags |= XFS_MOUNT_NOUUID;
	if (ap->flags & XFSMNT_BARRIER)
		mp->m_flags |= XFS_MOUNT_BARRIER;
	else
		mp->m_flags &= ~XFS_MOUNT_BARRIER;

	return 0;
}

/*
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock _has_ now been read in.
 */
STATIC int
xfs_finish_flags(
	struct vfs		*vfs,
	struct xfs_mount_args	*ap,
	struct xfs_mount	*mp)
{
	int			ronly = (vfs->vfs_flag & VFS_RDONLY);

	/* Fail a mount where the logbuf is smaller then the log stripe */
	if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
		if ((ap->logbufsize <= 0) &&
		    (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
			mp->m_logbsize = mp->m_sb.sb_logsunit;
		} else if (ap->logbufsize > 0 &&
			   ap->logbufsize < mp->m_sb.sb_logsunit) {
			cmn_err(CE_WARN,
	"XFS: logbuf size must be greater than or equal to log stripe size");
			return XFS_ERROR(EINVAL);
		}
	} else {
		/* Fail a mount if the logbuf is larger than 32K */
		if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
			cmn_err(CE_WARN,
	"XFS: logbuf size for version 1 logs must be 16K or 32K");
			return XFS_ERROR(EINVAL);
		}
	}

	if (XFS_SB_VERSION_HASATTR2(&mp->m_sb)) {
		mp->m_flags |= XFS_MOUNT_ATTR2;
	}

	/*
	 * prohibit r/w mounts of read-only filesystems
	 */
	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
		cmn_err(CE_WARN,
	"XFS: cannot mount a read-only filesystem as read-write");
		return XFS_ERROR(EROFS);
	}

	/*
	 * check for shared mount.
	 */
	if (ap->flags & XFSMNT_SHARED) {
		if (!XFS_SB_VERSION_HASSHARED(&mp->m_sb))
			return XFS_ERROR(EINVAL);

		/*
		 * For IRIX 6.5, shared mounts must have the shared
		 * version bit set, have the persistent readonly
		 * field set, must be version 0 and can only be mounted
		 * read-only.
		 */
		if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
		     (mp->m_sb.sb_shared_vn != 0))
			return XFS_ERROR(EINVAL);

		mp->m_flags |= XFS_MOUNT_SHARED;

		/*
		 * Shared XFS V0 can't deal with DMI.  Return EINVAL.
		 */
		if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
			return XFS_ERROR(EINVAL);
	}

	return 0;
}

/*
 * xfs_mount
 *
 * The file system configurations are:
 *	(1) device (partition) with data and internal log
 *	(2) logical volume with data and log subvolumes.
 *	(3) logical volume with data, log, and realtime subvolumes.
 *
 * We only have to handle opening the log and realtime volumes here if
 * they are present.  The data subvolume has already been opened by
 * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
 */
STATIC int
xfs_mount(
	struct bhv_desc		*bhvp,
	struct xfs_mount_args	*args,
	cred_t			*credp)
{
	struct vfs		*vfsp = bhvtovfs(bhvp);
	struct bhv_desc		*p;
	struct xfs_mount	*mp = XFS_BHVTOM(bhvp);
	struct block_device	*ddev, *logdev, *rtdev;
	int			flags = 0, error;

	ddev = vfsp->vfs_super->s_bdev;
	logdev = rtdev = NULL;

	/*
	 * Setup xfs_mount function vectors from available behaviors
	 */
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
	mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
	mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
	p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
	mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs;

	/*
	 * Open real time and log devices - order is important.
	 */
	if (args->logname[0]) {
		error = xfs_blkdev_get(mp, args->logname, &logdev);
		if (error)
			return error;
	}
	if (args->rtname[0]) {
		error = xfs_blkdev_get(mp, args->rtname, &rtdev);
		if (error) {
			xfs_blkdev_put(logdev);
			return error;
		}

		if (rtdev == ddev || rtdev == logdev) {
			cmn_err(CE_WARN,
	"XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
			xfs_blkdev_put(logdev);
			xfs_blkdev_put(rtdev);
			return EINVAL;
		}
	}

	/*
	 * Setup xfs_mount buffer target pointers
	 */
	error = ENOMEM;
	mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0);
	if (!mp->m_ddev_targp) {
		xfs_blkdev_put(logdev);
		xfs_blkdev_put(rtdev);
		return error;
	}
	if (rtdev) {
		mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
		if (!mp->m_rtdev_targp)
			goto error0;
	}
	mp->m_logdev_targp = (logdev && logdev != ddev) ?
				xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
	if (!mp->m_logdev_targp)
		goto error0;

	/*
	 * Setup flags based on mount(2) options and then the superblock
	 */
	error = xfs_start_flags(vfsp, args, mp);
	if (error)
		goto error1;
	error = xfs_readsb(mp);
	if (error)
		goto error1;
	error = xfs_finish_flags(vfsp, args, mp);
	if (error)
		goto error2;

	/*
	 * Setup xfs_mount buffer target pointers based on superblock
	 */
	error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
				    mp->m_sb.sb_sectsize);
	if (!error && logdev && logdev != ddev) {
		unsigned int	log_sector_size = BBSIZE;

		if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb))
			log_sector_size = mp->m_sb.sb_logsectsize;
		error = xfs_setsize_buftarg(mp->m_logdev_targp,
					    mp->m_sb.sb_blocksize,
					    log_sector_size);
	}
	if (!error && rtdev)
		error = xfs_setsize_buftarg(mp->m_rtdev_targp,
					    mp->m_sb.sb_blocksize,
					    mp->m_sb.sb_sectsize);
	if (error)
		goto error2;

	if ((mp->m_flags & XFS_MOUNT_BARRIER) && !(vfsp->vfs_flag & VFS_RDONLY))
		xfs_mountfs_check_barriers(mp);

	error = XFS_IOINIT(vfsp, args, flags);
	if (error)
		goto error2;

	return 0;

error2:
	if (mp->m_sb_bp)
		xfs_freesb(mp);
error1:
	xfs_binval(mp->m_ddev_targp);
	if (logdev && logdev != ddev)
		xfs_binval(mp->m_logdev_targp);
	if (rtdev)
		xfs_binval(mp->m_rtdev_targp);
error0:
	xfs_unmountfs_close(mp, credp);
	return error;
}

STATIC int
xfs_unmount(
	bhv_desc_t	*bdp,
	int		flags,
	cred_t		*credp)
{
	struct vfs	*vfsp = bhvtovfs(bdp);
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);
	xfs_inode_t	*rip;
	vnode_t		*rvp;
	int		unmount_event_wanted = 0;
	int		unmount_event_flags = 0;
	int		xfs_unmountfs_needed = 0;
	int		error;

	rip = mp->m_rootip;
	rvp = XFS_ITOV(rip);

	if (vfsp->vfs_flag & VFS_DMI) {
		error = XFS_SEND_PREUNMOUNT(mp, vfsp,
				rvp, DM_RIGHT_NULL, rvp, DM_RIGHT_NULL,
				NULL, NULL, 0, 0,
				(mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))?
					0:DM_FLAGS_UNWANTED);
			if (error)
				return XFS_ERROR(error);
		unmount_event_wanted = 1;
		unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))?
					0 : DM_FLAGS_UNWANTED;
	}

	/*
	 * First blow any referenced inode from this file system
	 * out of the reference cache, and delete the timer.
	 */
	xfs_refcache_purge_mp(mp);

	XFS_bflush(mp->m_ddev_targp);
	error = xfs_unmount_flush(mp, 0);
	if (error)
		goto out;

	ASSERT(vn_count(rvp) == 1);

	/*
	 * Drop the reference count
	 */
	VN_RELE(rvp);

	/*
	 * If we're forcing a shutdown, typically because of a media error,
	 * we want to make sure we invalidate dirty pages that belong to
	 * referenced vnodes as well.
	 */
	if (XFS_FORCED_SHUTDOWN(mp)) {
		error = xfs_sync(&mp->m_bhv,
			 (SYNC_WAIT | SYNC_CLOSE), credp);
		ASSERT(error != EFSCORRUPTED);
	}
	xfs_unmountfs_needed = 1;

out:
	/*	Send DMAPI event, if required.
	 *	Then do xfs_unmountfs() if needed.
	 *	Then return error (or zero).
	 */
	if (unmount_event_wanted) {
		/* Note: mp structure must still exist for
		 * XFS_SEND_UNMOUNT() call.
		 */
		XFS_SEND_UNMOUNT(mp, vfsp, error == 0 ? rvp : NULL,
			DM_RIGHT_NULL, 0, error, unmount_event_flags);
	}
	if (xfs_unmountfs_needed) {
		/*
		 * Call common unmount function to flush to disk
		 * and free the super block buffer & mount structures.
		 */
		xfs_unmountfs(mp, credp);
	}

	return XFS_ERROR(error);
}

STATIC int
xfs_quiesce_fs(
	xfs_mount_t		*mp)
{
	int			count = 0, pincount;
		
	xfs_refcache_purge_mp(mp);
	xfs_flush_buftarg(mp->m_ddev_targp, 0);
	xfs_finish_reclaim_all(mp, 0);

	/* This loop must run at least twice.
	 * The first instance of the loop will flush
	 * most meta data but that will generate more
	 * meta data (typically directory updates).
	 * Which then must be flushed and logged before
	 * we can write the unmount record.
	 */ 
	do {
		xfs_syncsub(mp, SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT, 0, NULL);
		pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
		if (!pincount) {
			delay(50);
			count++;
		}
	} while (count < 2);

	return 0;
}

STATIC int
xfs_mntupdate(
	bhv_desc_t			*bdp,
	int				*flags,
	struct xfs_mount_args		*args)
{
	struct vfs	*vfsp = bhvtovfs(bdp);
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);
	int		error;

	if (args->flags & XFSMNT_NOATIME)
		mp->m_flags |= XFS_MOUNT_NOATIME;
	else
		mp->m_flags &= ~XFS_MOUNT_NOATIME;

	if (args->flags & XFSMNT_BARRIER)
		mp->m_flags |= XFS_MOUNT_BARRIER;
	else
		mp->m_flags &= ~XFS_MOUNT_BARRIER;

	if ((vfsp->vfs_flag & VFS_RDONLY) &&
	    !(*flags & MS_RDONLY)) {
		vfsp->vfs_flag &= ~VFS_RDONLY;

		if (args->flags & XFSMNT_BARRIER)
			xfs_mountfs_check_barriers(mp);
	}

	if (!(vfsp->vfs_flag & VFS_RDONLY) &&
	    (*flags & MS_RDONLY)) {
		VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL, error);

		xfs_quiesce_fs(mp);

		/* Ok now write out an unmount record */
		xfs_log_unmount_write(mp);
		xfs_unmountfs_writesb(mp);
		vfsp->vfs_flag |= VFS_RDONLY;
	}

	return 0;
}

/*
 * xfs_unmount_flush implements a set of flush operation on special
 * inodes, which are needed as a separate set of operations so that
 * they can be called as part of relocation process.
 */
int
xfs_unmount_flush(
	xfs_mount_t	*mp,		/* Mount structure we are getting
					   rid of. */
	int             relocation)	/* Called from vfs relocation. */
{
	xfs_inode_t	*rip = mp->m_rootip;
	xfs_inode_t	*rbmip;
	xfs_inode_t	*rsumip = NULL;
	vnode_t		*rvp = XFS_ITOV(rip);
	int		error;

	xfs_ilock(rip, XFS_ILOCK_EXCL);
	xfs_iflock(rip);

	/*
	 * Flush out the real time inodes.
	 */
	if ((rbmip = mp->m_rbmip) != NULL) {
		xfs_ilock(rbmip, XFS_ILOCK_EXCL);
		xfs_iflock(rbmip);
		error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
		xfs_iunlock(rbmip, XFS_ILOCK_EXCL);

		if (error == EFSCORRUPTED)
			goto fscorrupt_out;

		ASSERT(vn_count(XFS_ITOV(rbmip)) == 1);

		rsumip = mp->m_rsumip;
		xfs_ilock(rsumip, XFS_ILOCK_EXCL);
		xfs_iflock(rsumip);
		error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
		xfs_iunlock(rsumip, XFS_ILOCK_EXCL);

		if (error == EFSCORRUPTED)
			goto fscorrupt_out;

		ASSERT(vn_count(XFS_ITOV(rsumip)) == 1);
	}

	/*
	 * Synchronously flush root inode to disk
	 */
	error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
	if (error == EFSCORRUPTED)
		goto fscorrupt_out2;

	if (vn_count(rvp) != 1 && !relocation) {
		xfs_iunlock(rip, XFS_ILOCK_EXCL);
		return XFS_ERROR(EBUSY);
	}

	/*
	 * Release dquot that rootinode, rbmino and rsumino might be holding,
	 * flush and purge the quota inodes.
	 */
	error = XFS_QM_UNMOUNT(mp);
	if (error == EFSCORRUPTED)
		goto fscorrupt_out2;

	if (rbmip) {
		VN_RELE(XFS_ITOV(rbmip));
		VN_RELE(XFS_ITOV(rsumip));
	}

	xfs_iunlock(rip, XFS_ILOCK_EXCL);
	return 0;

fscorrupt_out:
	xfs_ifunlock(rip);

fscorrupt_out2:
	xfs_iunlock(rip, XFS_ILOCK_EXCL);

	return XFS_ERROR(EFSCORRUPTED);
}

/*
 * xfs_root extracts the root vnode from a vfs.
 *
 * vfsp -- the vfs struct for the desired file system
 * vpp  -- address of the caller's vnode pointer which should be
 *         set to the desired fs root vnode
 */
STATIC int
xfs_root(
	bhv_desc_t	*bdp,
	vnode_t		**vpp)
{
	vnode_t		*vp;

	vp = XFS_ITOV((XFS_BHVTOM(bdp))->m_rootip);
	VN_HOLD(vp);
	*vpp = vp;
	return 0;
}

/*
 * xfs_statvfs
 *
 * Fill in the statvfs structure for the given file system.  We use
 * the superblock lock in the mount structure to ensure a consistent
 * snapshot of the counters returned.
 */
STATIC int
xfs_statvfs(
	bhv_desc_t	*bdp,
	xfs_statfs_t	*statp,
	vnode_t		*vp)
{
	__uint64_t	fakeinos;
	xfs_extlen_t	lsize;
	xfs_mount_t	*mp;
	xfs_sb_t	*sbp;
	unsigned long	s;

	mp = XFS_BHVTOM(bdp);
	sbp = &(mp->m_sb);

	statp->f_type = XFS_SB_MAGIC;

	s = XFS_SB_LOCK(mp);
	statp->f_bsize = sbp->sb_blocksize;
	lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
	statp->f_blocks = sbp->sb_dblocks - lsize;
	statp->f_bfree = statp->f_bavail = sbp->sb_fdblocks;
	fakeinos = statp->f_bfree << sbp->sb_inopblog;
#if XFS_BIG_INUMS
	fakeinos += mp->m_inoadd;
#endif
	statp->f_files =
	    MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
	if (mp->m_maxicount)
#if XFS_BIG_INUMS
		if (!mp->m_inoadd)
#endif
			statp->f_files = min_t(typeof(statp->f_files),
						statp->f_files,
						mp->m_maxicount);
	statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
	XFS_SB_UNLOCK(mp, s);

	xfs_statvfs_fsid(statp, mp);
	statp->f_namelen = MAXNAMELEN - 1;

	return 0;
}


/*
 * xfs_sync flushes any pending I/O to file system vfsp.
 *
 * This routine is called by vfs_sync() to make sure that things make it
 * out to disk eventually, on sync() system calls to flush out everything,
 * and when the file system is unmounted.  For the vfs_sync() case, all
 * we really need to do is sync out the log to make all of our meta-data
 * updates permanent (except for timestamps).  For calls from pflushd(),
 * dirty pages are kept moving by calling pdflush() on the inodes
 * containing them.  We also flush the inodes that we can lock without
 * sleeping and the superblock if we can lock it without sleeping from
 * vfs_sync() so that items at the tail of the log are always moving out.
 *
 * Flags:
 *      SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
 *		       to sleep if we can help it.  All we really need
 *		       to do is ensure that the log is synced at least
 *		       periodically.  We also push the inodes and
 *		       superblock if we can lock them without sleeping
 *			and they are not pinned.
 *      SYNC_ATTR    - We need to flush the inodes.  If SYNC_BDFLUSH is not
 *		       set, then we really want to lock each inode and flush
 *		       it.
 *      SYNC_WAIT    - All the flushes that take place in this call should
 *		       be synchronous.
 *      SYNC_DELWRI  - This tells us to push dirty pages associated with
 *		       inodes.  SYNC_WAIT and SYNC_BDFLUSH are used to
 *		       determine if they should be flushed sync, async, or
 *		       delwri.
 *      SYNC_CLOSE   - This flag is passed when the system is being
 *		       unmounted.  We should sync and invalidate everthing.
 *      SYNC_FSDATA  - This indicates that the caller would like to make
 *		       sure the superblock is safe on disk.  We can ensure
 *		       this by simply makeing sure the log gets flushed
 *		       if SYNC_BDFLUSH is set, and by actually writing it
 *		       out otherwise.
 *
 */
/*ARGSUSED*/
STATIC int
xfs_sync(
	bhv_desc_t	*bdp,
	int		flags,
	cred_t		*credp)
{
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);

	if (unlikely(flags == SYNC_QUIESCE))
		return xfs_quiesce_fs(mp);
	else
		return xfs_syncsub(mp, flags, 0, NULL);
}

/*
 * xfs sync routine for internal use
 *
 * This routine supports all of the flags defined for the generic VFS_SYNC
 * interface as explained above under xfs_sync.  In the interests of not
 * changing interfaces within the 6.5 family, additional internallly-
 * required functions are specified within a separate xflags parameter,
 * only available by calling this routine.
 *
 */
int
xfs_sync_inodes(
	xfs_mount_t	*mp,
	int		flags,
	int             xflags,
	int             *bypassed)
{
	xfs_inode_t	*ip = NULL;
	xfs_inode_t	*ip_next;
	xfs_buf_t	*bp;
	vnode_t		*vp = NULL;
	int		error;
	int		last_error;
	uint64_t	fflag;
	uint		lock_flags;
	uint		base_lock_flags;
	boolean_t	mount_locked;
	boolean_t	vnode_refed;
	int		preempt;
	xfs_dinode_t	*dip;
	xfs_iptr_t	*ipointer;
#ifdef DEBUG
	boolean_t	ipointer_in = B_FALSE;

#define IPOINTER_SET	ipointer_in = B_TRUE
#define IPOINTER_CLR	ipointer_in = B_FALSE
#else
#define IPOINTER_SET
#define IPOINTER_CLR
#endif


/* Insert a marker record into the inode list after inode ip. The list
 * must be locked when this is called. After the call the list will no
 * longer be locked.
 */
#define IPOINTER_INSERT(ip, mp)	{ \
		ASSERT(ipointer_in == B_FALSE); \
		ipointer->ip_mnext = ip->i_mnext; \
		ipointer->ip_mprev = ip; \
		ip->i_mnext = (xfs_inode_t *)ipointer; \
		ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
		preempt = 0; \
		XFS_MOUNT_IUNLOCK(mp); \
		mount_locked = B_FALSE; \
		IPOINTER_SET; \
	}

/* Remove the marker from the inode list. If the marker was the only item
 * in the list then there are no remaining inodes and we should zero out
 * the whole list. If we are the current head of the list then move the head
 * past us.
 */
#define IPOINTER_REMOVE(ip, mp)	{ \
		ASSERT(ipointer_in == B_TRUE); \
		if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
			ip = ipointer->ip_mnext; \
			ip->i_mprev = ipointer->ip_mprev; \
			ipointer->ip_mprev->i_mnext = ip; \
			if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
				mp->m_inodes = ip; \
			} \
		} else { \
			ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
			mp->m_inodes = NULL; \
			ip = NULL; \
		} \
		IPOINTER_CLR; \
	}

#define XFS_PREEMPT_MASK	0x7f

	if (bypassed)
		*bypassed = 0;
	if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
		return 0;
	error = 0;
	last_error = 0;
	preempt = 0;

	/* Allocate a reference marker */
	ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);

	fflag = XFS_B_ASYNC;		/* default is don't wait */
	if (flags & (SYNC_BDFLUSH | SYNC_DELWRI))
		fflag = XFS_B_DELWRI;
	if (flags & SYNC_WAIT)
		fflag = 0;		/* synchronous overrides all */

	base_lock_flags = XFS_ILOCK_SHARED;
	if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
		/*
		 * We need the I/O lock if we're going to call any of
		 * the flush/inval routines.
		 */
		base_lock_flags |= XFS_IOLOCK_SHARED;
	}

	XFS_MOUNT_ILOCK(mp);

	ip = mp->m_inodes;

	mount_locked = B_TRUE;
	vnode_refed  = B_FALSE;

	IPOINTER_CLR;

	do {
		ASSERT(ipointer_in == B_FALSE);
		ASSERT(vnode_refed == B_FALSE);

		lock_flags = base_lock_flags;

		/*
		 * There were no inodes in the list, just break out
		 * of the loop.
		 */
		if (ip == NULL) {
			break;
		}

		/*
		 * We found another sync thread marker - skip it
		 */
		if (ip->i_mount == NULL) {
			ip = ip->i_mnext;
			continue;
		}

		vp = XFS_ITOV_NULL(ip);

		/*
		 * If the vnode is gone then this is being torn down,
		 * call reclaim if it is flushed, else let regular flush
		 * code deal with it later in the loop.
		 */

		if (vp == NULL) {
			/* Skip ones already in reclaim */
			if (ip->i_flags & XFS_IRECLAIM) {
				ip = ip->i_mnext;
				continue;
			}
			if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
				ip = ip->i_mnext;
			} else if ((xfs_ipincount(ip) == 0) &&
				    xfs_iflock_nowait(ip)) {
				IPOINTER_INSERT(ip, mp);

				xfs_finish_reclaim(ip, 1,
						XFS_IFLUSH_DELWRI_ELSE_ASYNC);

				XFS_MOUNT_ILOCK(mp);
				mount_locked = B_TRUE;
				IPOINTER_REMOVE(ip, mp);
			} else {
				xfs_iunlock(ip, XFS_ILOCK_EXCL);
				ip = ip->i_mnext;
			}
			continue;
		}

		if (VN_BAD(vp)) {
			ip = ip->i_mnext;
			continue;
		}

		if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
			XFS_MOUNT_IUNLOCK(mp);
			kmem_free(ipointer, sizeof(xfs_iptr_t));
			return 0;
		}

		/*
		 * If this is just vfs_sync() or pflushd() calling
		 * then we can skip inodes for which it looks like
		 * there is nothing to do.  Since we don't have the
		 * inode locked this is racey, but these are periodic
		 * calls so it doesn't matter.  For the others we want
		 * to know for sure, so we at least try to lock them.
		 */
		if (flags & SYNC_BDFLUSH) {
			if (((ip->i_itemp == NULL) ||
			     !(ip->i_itemp->ili_format.ilf_fields &
			       XFS_ILOG_ALL)) &&
			    (ip->i_update_core == 0)) {
				ip = ip->i_mnext;
				continue;
			}
		}

		/*
		 * Try to lock without sleeping.  We're out of order with
		 * the inode list lock here, so if we fail we need to drop
		 * the mount lock and try again.  If we're called from
		 * bdflush() here, then don't bother.
		 *
		 * The inode lock here actually coordinates with the
		 * almost spurious inode lock in xfs_ireclaim() to prevent
		 * the vnode we handle here without a reference from
		 * being freed while we reference it.  If we lock the inode
		 * while it's on the mount list here, then the spurious inode
		 * lock in xfs_ireclaim() after the inode is pulled from
		 * the mount list will sleep until we release it here.
		 * This keeps the vnode from being freed while we reference
		 * it.
		 */
		if (xfs_ilock_nowait(ip, lock_flags) == 0) {
			if ((flags & SYNC_BDFLUSH) || (vp == NULL)) {
				ip = ip->i_mnext;
				continue;
			}

			vp = vn_grab(vp);
			if (vp == NULL) {
				ip = ip->i_mnext;
				continue;
			}

			IPOINTER_INSERT(ip, mp);
			xfs_ilock(ip, lock_flags);

			ASSERT(vp == XFS_ITOV(ip));
			ASSERT(ip->i_mount == mp);

			vnode_refed = B_TRUE;
		}

		/* From here on in the loop we may have a marker record
		 * in the inode list.
		 */

		if ((flags & SYNC_CLOSE)  && (vp != NULL)) {
			/*
			 * This is the shutdown case.  We just need to
			 * flush and invalidate all the pages associated
			 * with the inode.  Drop the inode lock since
			 * we can't hold it across calls to the buffer
			 * cache.
			 *
			 * We don't set the VREMAPPING bit in the vnode
			 * here, because we don't hold the vnode lock
			 * exclusively.  It doesn't really matter, though,
			 * because we only come here when we're shutting
			 * down anyway.
			 */
			xfs_iunlock(ip, XFS_ILOCK_SHARED);

			if (XFS_FORCED_SHUTDOWN(mp)) {
				VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
			} else {
				VOP_FLUSHINVAL_PAGES(vp, 0, -1, FI_REMAPF);
			}

			xfs_ilock(ip, XFS_ILOCK_SHARED);

		} else if ((flags & SYNC_DELWRI) && (vp != NULL)) {
			if (VN_DIRTY(vp)) {
				/* We need to have dropped the lock here,
				 * so insert a marker if we have not already
				 * done so.
				 */
				if (mount_locked) {
					IPOINTER_INSERT(ip, mp);
				}

				/*
				 * Drop the inode lock since we can't hold it
				 * across calls to the buffer cache.
				 */
				xfs_iunlock(ip, XFS_ILOCK_SHARED);
				VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1,
							fflag, FI_NONE, error);
				xfs_ilock(ip, XFS_ILOCK_SHARED);
			}

		}

		if (flags & SYNC_BDFLUSH) {
			if ((flags & SYNC_ATTR) &&
			    ((ip->i_update_core) ||
			     ((ip->i_itemp != NULL) &&
			      (ip->i_itemp->ili_format.ilf_fields != 0)))) {

				/* Insert marker and drop lock if not already
				 * done.
				 */
				if (mount_locked) {
					IPOINTER_INSERT(ip, mp);
				}

				/*
				 * We don't want the periodic flushing of the
				 * inodes by vfs_sync() to interfere with
				 * I/O to the file, especially read I/O
				 * where it is only the access time stamp
				 * that is being flushed out.  To prevent
				 * long periods where we have both inode
				 * locks held shared here while reading the
				 * inode's buffer in from disk, we drop the
				 * inode lock while reading in the inode
				 * buffer.  We have to release the buffer
				 * and reacquire the inode lock so that they
				 * are acquired in the proper order (inode
				 * locks first).  The buffer will go at the
				 * end of the lru chain, though, so we can
				 * expect it to still be there when we go
				 * for it again in xfs_iflush().
				 */
				if ((xfs_ipincount(ip) == 0) &&
				    xfs_iflock_nowait(ip)) {

					xfs_ifunlock(ip);
					xfs_iunlock(ip, XFS_ILOCK_SHARED);

					error = xfs_itobp(mp, NULL, ip,
							  &dip, &bp, 0);
					if (!error) {
						xfs_buf_relse(bp);
					} else {
						/* Bailing out, remove the
						 * marker and free it.
						 */
						XFS_MOUNT_ILOCK(mp);

						IPOINTER_REMOVE(ip, mp);

						XFS_MOUNT_IUNLOCK(mp);

						ASSERT(!(lock_flags &
							XFS_IOLOCK_SHARED));

						kmem_free(ipointer,
							sizeof(xfs_iptr_t));
						return (0);
					}

					/*
					 * Since we dropped the inode lock,
					 * the inode may have been reclaimed.
					 * Therefore, we reacquire the mount
					 * lock and check to see if we were the
					 * inode reclaimed. If this happened
					 * then the ipointer marker will no
					 * longer point back at us. In this
					 * case, move ip along to the inode
					 * after the marker, remove the marker
					 * and continue.
					 */
					XFS_MOUNT_ILOCK(mp);
					mount_locked = B_TRUE;

					if (ip != ipointer->ip_mprev) {
						IPOINTER_REMOVE(ip, mp);

						ASSERT(!vnode_refed);
						ASSERT(!(lock_flags &
							XFS_IOLOCK_SHARED));
						continue;
					}

					ASSERT(ip->i_mount == mp);

					if (xfs_ilock_nowait(ip,
						    XFS_ILOCK_SHARED) == 0) {
						ASSERT(ip->i_mount == mp);
						/*
						 * We failed to reacquire
						 * the inode lock without
						 * sleeping, so just skip
						 * the inode for now.  We
						 * clear the ILOCK bit from
						 * the lock_flags so that we
						 * won't try to drop a lock
						 * we don't hold below.
						 */
						lock_flags &= ~XFS_ILOCK_SHARED;
						IPOINTER_REMOVE(ip_next, mp);
					} else if ((xfs_ipincount(ip) == 0) &&
						   xfs_iflock_nowait(ip)) {
						ASSERT(ip->i_mount == mp);
						/*
						 * Since this is vfs_sync()
						 * calling we only flush the
						 * inode out if we can lock
						 * it without sleeping and
						 * it is not pinned.  Drop
						 * the mount lock here so
						 * that we don't hold it for
						 * too long. We already have
						 * a marker in the list here.
						 */
						XFS_MOUNT_IUNLOCK(mp);
						mount_locked = B_FALSE;
						error = xfs_iflush(ip,
							   XFS_IFLUSH_DELWRI);
					} else {
						ASSERT(ip->i_mount == mp);
						IPOINTER_REMOVE(ip_next, mp);
					}
				}

			}

		} else {
			if ((flags & SYNC_ATTR) &&
			    ((ip->i_update_core) ||
			     ((ip->i_itemp != NULL) &&
			      (ip->i_itemp->ili_format.ilf_fields != 0)))) {
				if (mount_locked) {
					IPOINTER_INSERT(ip, mp);
				}

				if (flags & SYNC_WAIT) {
					xfs_iflock(ip);
					error = xfs_iflush(ip,
							   XFS_IFLUSH_SYNC);
				} else {
					/*
					 * If we can't acquire the flush
					 * lock, then the inode is already
					 * being flushed so don't bother
					 * waiting.  If we can lock it then
					 * do a delwri flush so we can
					 * combine multiple inode flushes
					 * in each disk write.
					 */
					if (xfs_iflock_nowait(ip)) {
						error = xfs_iflush(ip,
							   XFS_IFLUSH_DELWRI);
					}
					else if (bypassed)
						(*bypassed)++;
				}
			}
		}

		if (lock_flags != 0) {
			xfs_iunlock(ip, lock_flags);
		}

		if (vnode_refed) {
			/*
			 * If we had to take a reference on the vnode
			 * above, then wait until after we've unlocked
			 * the inode to release the reference.  This is
			 * because we can be already holding the inode
			 * lock when VN_RELE() calls xfs_inactive().
			 *
			 * Make sure to drop the mount lock before calling
			 * VN_RELE() so that we don't trip over ourselves if
			 * we have to go for the mount lock again in the
			 * inactive code.
			 */
			if (mount_locked) {
				IPOINTER_INSERT(ip, mp);
			}

			VN_RELE(vp);

			vnode_refed = B_FALSE;
		}

		if (error) {
			last_error = error;
		}

		/*
		 * bail out if the filesystem is corrupted.
		 */
		if (error == EFSCORRUPTED)  {
			if (!mount_locked) {
				XFS_MOUNT_ILOCK(mp);
				IPOINTER_REMOVE(ip, mp);
			}
			XFS_MOUNT_IUNLOCK(mp);
			ASSERT(ipointer_in == B_FALSE);
			kmem_free(ipointer, sizeof(xfs_iptr_t));
			return XFS_ERROR(error);
		}

		/* Let other threads have a chance at the mount lock
		 * if we have looped many times without dropping the
		 * lock.
		 */
		if ((++preempt & XFS_PREEMPT_MASK) == 0) {
			if (mount_locked) {
				IPOINTER_INSERT(ip, mp);
			}
		}

		if (mount_locked == B_FALSE) {
			XFS_MOUNT_ILOCK(mp);
			mount_locked = B_TRUE;
			IPOINTER_REMOVE(ip, mp);
			continue;
		}

		ASSERT(ipointer_in == B_FALSE);
		ip = ip->i_mnext;

	} while (ip != mp->m_inodes);

	XFS_MOUNT_IUNLOCK(mp);

	ASSERT(ipointer_in == B_FALSE);

	kmem_free(ipointer, sizeof(xfs_iptr_t));
	return XFS_ERROR(last_error);
}

/*
 * xfs sync routine for internal use
 *
 * This routine supports all of the flags defined for the generic VFS_SYNC
 * interface as explained above under xfs_sync.  In the interests of not
 * changing interfaces within the 6.5 family, additional internallly-
 * required functions are specified within a separate xflags parameter,
 * only available by calling this routine.
 *
 */
int
xfs_syncsub(
	xfs_mount_t	*mp,
	int		flags,
	int             xflags,
	int             *bypassed)
{
	int		error = 0;
	int		last_error = 0;
	uint		log_flags = XFS_LOG_FORCE;
	xfs_buf_t	*bp;
	xfs_buf_log_item_t	*bip;

	/*
	 * Sync out the log.  This ensures that the log is periodically
	 * flushed even if there is not enough activity to fill it up.
	 */
	if (flags & SYNC_WAIT)
		log_flags |= XFS_LOG_SYNC;

	xfs_log_force(mp, (xfs_lsn_t)0, log_flags);

	if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
		if (flags & SYNC_BDFLUSH)
			xfs_finish_reclaim_all(mp, 1);
		else
			error = xfs_sync_inodes(mp, flags, xflags, bypassed);
	}

	/*
	 * Flushing out dirty data above probably generated more
	 * log activity, so if this isn't vfs_sync() then flush
	 * the log again.
	 */
	if (flags & SYNC_DELWRI) {
		xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
	}

	if (flags & SYNC_FSDATA) {
		/*
		 * If this is vfs_sync() then only sync the superblock
		 * if we can lock it without sleeping and it is not pinned.
		 */
		if (flags & SYNC_BDFLUSH) {
			bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
			if (bp != NULL) {
				bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
				if ((bip != NULL) &&
				    xfs_buf_item_dirty(bip)) {
					if (!(XFS_BUF_ISPINNED(bp))) {
						XFS_BUF_ASYNC(bp);
						error = xfs_bwrite(mp, bp);
					} else {
						xfs_buf_relse(bp);
					}
				} else {
					xfs_buf_relse(bp);
				}
			}
		} else {
			bp = xfs_getsb(mp, 0);
			/*
			 * If the buffer is pinned then push on the log so
			 * we won't get stuck waiting in the write for
			 * someone, maybe ourselves, to flush the log.
			 * Even though we just pushed the log above, we
			 * did not have the superblock buffer locked at
			 * that point so it can become pinned in between
			 * there and here.
			 */
			if (XFS_BUF_ISPINNED(bp))
				xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
			if (flags & SYNC_WAIT)
				XFS_BUF_UNASYNC(bp);
			else
				XFS_BUF_ASYNC(bp);
			error = xfs_bwrite(mp, bp);
		}
		if (error) {
			last_error = error;
		}
	}

	/*
	 * If this is the periodic sync, then kick some entries out of
	 * the reference cache.  This ensures that idle entries are
	 * eventually kicked out of the cache.
	 */
	if (flags & SYNC_REFCACHE) {
		if (flags & SYNC_WAIT)
			xfs_refcache_purge_mp(mp);
		else
			xfs_refcache_purge_some(mp);
	}

	/*
	 * Now check to see if the log needs a "dummy" transaction.
	 */

	if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
		xfs_trans_t *tp;
		xfs_inode_t *ip;

		/*
		 * Put a dummy transaction in the log to tell
		 * recovery that all others are OK.
		 */
		tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
		if ((error = xfs_trans_reserve(tp, 0,
				XFS_ICHANGE_LOG_RES(mp),
				0, 0, 0)))  {
			xfs_trans_cancel(tp, 0);
			return error;
		}

		ip = mp->m_rootip;
		xfs_ilock(ip, XFS_ILOCK_EXCL);

		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
		xfs_trans_ihold(tp, ip);
		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
		error = xfs_trans_commit(tp, 0, NULL);
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
	}

	/*
	 * When shutting down, we need to insure that the AIL is pushed
	 * to disk or the filesystem can appear corrupt from the PROM.
	 */
	if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
		XFS_bflush(mp->m_ddev_targp);
		if (mp->m_rtdev_targp) {
			XFS_bflush(mp->m_rtdev_targp);
		}
	}

	return XFS_ERROR(last_error);
}

/*
 * xfs_vget - called by DMAPI and NFSD to get vnode from file handle
 */
STATIC int
xfs_vget(
	bhv_desc_t	*bdp,
	vnode_t		**vpp,
	fid_t		*fidp)
{
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);
	xfs_fid_t	*xfid = (struct xfs_fid *)fidp;
	xfs_inode_t	*ip;
	int		error;
	xfs_ino_t	ino;
	unsigned int	igen;

	/*
	 * Invalid.  Since handles can be created in user space and passed in
	 * via gethandle(), this is not cause for a panic.
	 */
	if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
		return XFS_ERROR(EINVAL);

	ino  = xfid->xfs_fid_ino;
	igen = xfid->xfs_fid_gen;

	/*
	 * NFS can sometimes send requests for ino 0.  Fail them gracefully.
	 */
	if (ino == 0)
		return XFS_ERROR(ESTALE);

	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
	if (error) {
		*vpp = NULL;
		return error;
	}

	if (ip == NULL) {
		*vpp = NULL;
		return XFS_ERROR(EIO);
	}

	if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
		xfs_iput_new(ip, XFS_ILOCK_SHARED);
		*vpp = NULL;
		return XFS_ERROR(ENOENT);
	}

	*vpp = XFS_ITOV(ip);
	xfs_iunlock(ip, XFS_ILOCK_SHARED);
	return 0;
}


#define MNTOPT_LOGBUFS	"logbufs"	/* number of XFS log buffers */
#define MNTOPT_LOGBSIZE	"logbsize"	/* size of XFS log buffers */
#define MNTOPT_LOGDEV	"logdev"	/* log device */
#define MNTOPT_RTDEV	"rtdev"		/* realtime I/O device */
#define MNTOPT_BIOSIZE	"biosize"	/* log2 of preferred buffered io size */
#define MNTOPT_WSYNC	"wsync"		/* safe-mode nfs compatible mount */
#define MNTOPT_INO64	"ino64"		/* force inodes into 64-bit range */
#define MNTOPT_NOALIGN	"noalign"	/* turn off stripe alignment */
#define MNTOPT_SWALLOC	"swalloc"	/* turn on stripe width allocation */
#define MNTOPT_SUNIT	"sunit"		/* data volume stripe unit */
#define MNTOPT_SWIDTH	"swidth"	/* data volume stripe width */
#define MNTOPT_NOUUID	"nouuid"	/* ignore filesystem UUID */
#define MNTOPT_MTPT	"mtpt"		/* filesystem mount point */
#define MNTOPT_GRPID	"grpid"		/* group-ID from parent directory */
#define MNTOPT_NOGRPID	"nogrpid"	/* group-ID from current process */
#define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
#define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
#define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
#define MNTOPT_IHASHSIZE    "ihashsize"    /* size of inode hash table */
#define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
#define MNTOPT_BARRIER	"barrier"	/* use writer barriers for log write and
					 * unwritten extent conversion */
#define MNTOPT_NOBARRIER "nobarrier"	/* .. disable */
#define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
#define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */
#define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
#define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */
#define MNTOPT_LARGEIO	   "largeio"	/* report large I/O sizes in stat() */
#define MNTOPT_NOLARGEIO   "nolargeio"	/* do not report large I/O sizes
					 * in stat(). */
#define MNTOPT_ATTR2	"attr2"		/* do use attr2 attribute format */
#define MNTOPT_NOATTR2	"noattr2"	/* do not use attr2 attribute format */

STATIC unsigned long
suffix_strtoul(const char *cp, char **endp, unsigned int base)
{
	int	last, shift_left_factor = 0;
	char	*value = (char *)cp;

	last = strlen(value) - 1;
	if (value[last] == 'K' || value[last] == 'k') {
		shift_left_factor = 10;
		value[last] = '\0';
	}
	if (value[last] == 'M' || value[last] == 'm') {
		shift_left_factor = 20;
		value[last] = '\0';
	}
	if (value[last] == 'G' || value[last] == 'g') {
		shift_left_factor = 30;
		value[last] = '\0';
	}

	return simple_strtoul(cp, endp, base) << shift_left_factor;
}

STATIC int
xfs_parseargs(
	struct bhv_desc		*bhv,
	char			*options,
	struct xfs_mount_args	*args,
	int			update)
{
	struct vfs		*vfsp = bhvtovfs(bhv);
	char			*this_char, *value, *eov;
	int			dsunit, dswidth, vol_dsunit, vol_dswidth;
	int			iosize;

	args->flags2 |= XFSMNT2_COMPAT_IOSIZE;

#if 0	/* XXX: off by default, until some remaining issues ironed out */
	args->flags |= XFSMNT_IDELETE; /* default to on */
#endif

	if (!options)
		goto done;

	iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;

	while ((this_char = strsep(&options, ",")) != NULL) {
		if (!*this_char)
			continue;
		if ((value = strchr(this_char, '=')) != NULL)
			*value++ = 0;

		if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			args->logbufs = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			args->logbufsize = suffix_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			strncpy(args->logname, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_MTPT)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			strncpy(args->mtpt, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			strncpy(args->rtname, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			iosize = simple_strtoul(value, &eov, 10);
			args->flags |= XFSMNT_IOSIZE;
			args->iosizelog = (uint8_t) iosize;
		} else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			iosize = suffix_strtoul(value, &eov, 10);
			args->flags |= XFSMNT_IOSIZE;
			args->iosizelog = ffs(iosize) - 1;
		} else if (!strcmp(this_char, MNTOPT_IHASHSIZE)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			args->flags |= XFSMNT_IHASHSIZE;
			args->ihashsize = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_GRPID) ||
			   !strcmp(this_char, MNTOPT_BSDGROUPS)) {
			vfsp->vfs_flag |= VFS_GRPID;
		} else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
			   !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
			vfsp->vfs_flag &= ~VFS_GRPID;
		} else if (!strcmp(this_char, MNTOPT_WSYNC)) {
			args->flags |= XFSMNT_WSYNC;
		} else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
			args->flags |= XFSMNT_OSYNCISOSYNC;
		} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
			args->flags |= XFSMNT_NORECOVERY;
		} else if (!strcmp(this_char, MNTOPT_INO64)) {
			args->flags |= XFSMNT_INO64;
#if !XFS_BIG_INUMS
			printk("XFS: %s option not allowed on this system\n",
				this_char);
			return EINVAL;
#endif
		} else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
			args->flags |= XFSMNT_NOALIGN;
		} else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
			args->flags |= XFSMNT_SWALLOC;
		} else if (!strcmp(this_char, MNTOPT_SUNIT)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			dsunit = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					this_char);
				return EINVAL;
			}
			dswidth = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
			args->flags &= ~XFSMNT_32BITINODES;
#if !XFS_BIG_INUMS
			printk("XFS: %s option not allowed on this system\n",
				this_char);
			return EINVAL;
#endif
		} else if (!strcmp(this_char, MNTOPT_NOUUID)) {
			args->flags |= XFSMNT_NOUUID;
		} else if (!strcmp(this_char, MNTOPT_BARRIER)) {
			args->flags |= XFSMNT_BARRIER;
		} else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
			args->flags &= ~XFSMNT_BARRIER;
		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
			args->flags &= ~XFSMNT_IDELETE;
		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
			args->flags |= XFSMNT_IDELETE;
		} else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
			args->flags2 &= ~XFSMNT2_COMPAT_IOSIZE;
		} else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
			args->flags2 |= XFSMNT2_COMPAT_IOSIZE;
		} else if (!strcmp(this_char, MNTOPT_ATTR2)) {
			args->flags |= XFSMNT_ATTR2;
		} else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
			args->flags &= ~XFSMNT_ATTR2;
		} else if (!strcmp(this_char, "osyncisdsync")) {
			/* no-op, this is now the default */
printk("XFS: osyncisdsync is now the default, option is deprecated.\n");
		} else if (!strcmp(this_char, "irixsgid")) {
printk("XFS: irixsgid is now a sysctl(2) variable, option is deprecated.\n");
		} else {
			printk("XFS: unknown mount option [%s].\n", this_char);
			return EINVAL;
		}
	}

	if (args->flags & XFSMNT_NORECOVERY) {
		if ((vfsp->vfs_flag & VFS_RDONLY) == 0) {
			printk("XFS: no-recovery mounts must be read-only.\n");
			return EINVAL;
		}
	}

	if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
		printk(
	"XFS: sunit and swidth options incompatible with the noalign option\n");
		return EINVAL;
	}

	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
		printk("XFS: sunit and swidth must be specified together\n");
		return EINVAL;
	}

	if (dsunit && (dswidth % dsunit != 0)) {
		printk(
	"XFS: stripe width (%d) must be a multiple of the stripe unit (%d)\n",
			dswidth, dsunit);
		return EINVAL;
	}

	if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
		if (dsunit) {
			args->sunit = dsunit;
			args->flags |= XFSMNT_RETERR;
		} else {
			args->sunit = vol_dsunit;
		}
		dswidth ? (args->swidth = dswidth) :
			  (args->swidth = vol_dswidth);
	} else {
		args->sunit = args->swidth = 0;
	}

done:
	if (args->flags & XFSMNT_32BITINODES)
		vfsp->vfs_flag |= VFS_32BITINODES;
	if (args->flags2)
		args->flags |= XFSMNT_FLAGS2;
	return 0;
}

STATIC int
xfs_showargs(
	struct bhv_desc		*bhv,
	struct seq_file		*m)
{
	static struct proc_xfs_info {
		int	flag;
		char	*str;
	} xfs_info[] = {
		/* the few simple ones we can get from the mount struct */
		{ XFS_MOUNT_WSYNC,		"," MNTOPT_WSYNC },
		{ XFS_MOUNT_INO64,		"," MNTOPT_INO64 },
		{ XFS_MOUNT_NOALIGN,		"," MNTOPT_NOALIGN },
		{ XFS_MOUNT_SWALLOC,		"," MNTOPT_SWALLOC },
		{ XFS_MOUNT_NOUUID,		"," MNTOPT_NOUUID },
		{ XFS_MOUNT_NORECOVERY,		"," MNTOPT_NORECOVERY },
		{ XFS_MOUNT_OSYNCISOSYNC,	"," MNTOPT_OSYNCISOSYNC },
		{ XFS_MOUNT_IDELETE,		"," MNTOPT_NOIKEEP },
		{ 0, NULL }
	};
	struct proc_xfs_info	*xfs_infop;
	struct xfs_mount	*mp = XFS_BHVTOM(bhv);
	struct vfs		*vfsp = XFS_MTOVFS(mp);

	for (xfs_infop = xfs_info; xfs_infop->flag; xfs_infop++) {
		if (mp->m_flags & xfs_infop->flag)
			seq_puts(m, xfs_infop->str);
	}

	if (mp->m_flags & XFS_MOUNT_IHASHSIZE)
		seq_printf(m, "," MNTOPT_IHASHSIZE "=%d", mp->m_ihsize);

	if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
		seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
				(int)(1 << mp->m_writeio_log) >> 10);

	if (mp->m_logbufs > 0)
		seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
	if (mp->m_logbsize > 0)
		seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);

	if (mp->m_logname)
		seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
	if (mp->m_rtname)
		seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);

	if (mp->m_dalign > 0)
		seq_printf(m, "," MNTOPT_SUNIT "=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));
	if (mp->m_swidth > 0)
		seq_printf(m, "," MNTOPT_SWIDTH "=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));

	if (!(mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE))
		seq_printf(m, "," MNTOPT_LARGEIO);
	if (mp->m_flags & XFS_MOUNT_BARRIER)
		seq_printf(m, "," MNTOPT_BARRIER);

	if (!(vfsp->vfs_flag & VFS_32BITINODES))
		seq_printf(m, "," MNTOPT_64BITINODE);
	if (vfsp->vfs_flag & VFS_GRPID)
		seq_printf(m, "," MNTOPT_GRPID);

	return 0;
}

STATIC void
xfs_freeze(
	bhv_desc_t	*bdp)
{
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);

	while (atomic_read(&mp->m_active_trans) > 0)
		delay(100);

	/* Push the superblock and write an unmount record */
	xfs_log_unmount_write(mp);
	xfs_unmountfs_writesb(mp);
	xfs_fs_log_dummy(mp);
}


vfsops_t xfs_vfsops = {
	BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS),
	.vfs_parseargs		= xfs_parseargs,
	.vfs_showargs		= xfs_showargs,
	.vfs_mount		= xfs_mount,
	.vfs_unmount		= xfs_unmount,
	.vfs_mntupdate		= xfs_mntupdate,
	.vfs_root		= xfs_root,
	.vfs_statvfs		= xfs_statvfs,
	.vfs_sync		= xfs_sync,
	.vfs_vget		= xfs_vget,
	.vfs_dmapiops		= (vfs_dmapiops_t)fs_nosys,
	.vfs_quotactl		= (vfs_quotactl_t)fs_nosys,
	.vfs_init_vnode		= xfs_initialize_vnode,
	.vfs_force_shutdown	= xfs_do_force_shutdown,
	.vfs_freeze		= xfs_freeze,
};