sys/vfs/hammer2/hammer2.h

   1 /*
   2  * Copyright (c) 2011-2012 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * This header file contains structures used internally by the HAMMER2
  38  * implementation.  See hammer2_disk.h for on-disk structures.
  39  */
  40
  41 #ifndef _VFS_HAMMER2_HAMMER2_H_
  42 #define _VFS_HAMMER2_HAMMER2_H_
  43
  44 #include <sys/param.h>
  45 #include <sys/types.h>
  46 #include <sys/kernel.h>
  47 #include <sys/conf.h>
  48 #include <sys/systm.h>
  49 #include <sys/tree.h>
  50 #include <sys/malloc.h>
  51 #include <sys/mount.h>
  52 #include <sys/vnode.h>
  53 #include <sys/proc.h>
  54 #include <sys/mountctl.h>
  55 #include <sys/priv.h>
  56 #include <sys/stat.h>
  57 #include <sys/thread.h>
  58 #include <sys/globaldata.h>
  59 #include <sys/lockf.h>
  60 #include <sys/buf.h>
  61 #include <sys/queue.h>
  62 #include <sys/limits.h>
  63 #include <sys/buf2.h>
  64 #include <sys/signal2.h>
  65 #include <sys/tree.h>
  66 #include <sys/dmsg.h>
  67
  68 #include "hammer2_disk.h"
  69 #include "hammer2_mount.h"
  70 #include "hammer2_ioctl.h"
  71 #include "hammer2_ccms.h"
  72
  73 struct hammer2_chain;
  74 struct hammer2_inode;
  75 struct hammer2_mount;
  76 struct hammer2_pfsmount;
  77 struct hammer2_span;
  78 struct hammer2_state;
  79 struct hammer2_msg;
  80
  81 /*
  82  * The chain structure tracks blockref recursions all the way to
  83  * the root volume.  These consist of indirect blocks, inodes,
  84  * and eventually the volume header.
  85  *
  86  * The chain structure is embedded in the hammer2_mount, hammer2_inode,
  87  * and other system memory structures.  The chain structure typically
  88  * implements the reference count and busy flag for the larger structure.
  89  *
  90  * It is always possible to track a chain element all the way back to the
  91  * root by following the (parent) links.  (index) is a type-dependent index
  92  * in the parent indicating where in the parent the chain element resides.
  93  *
  94  * When a blockref is added or deleted the related chain element is marked
  95  * modified and all of its parents are marked SUBMODIFIED (the parent
  96  * recursion can stop once we hit a node that is already marked SUBMODIFIED).
  97  * A deleted chain element must remain intact until synchronized against
  98  * its parent.
  99  *
 100  * The blockref at (parent, index) is not adjusted until the modified chain
 101  * element is flushed and unmarked.  Until then the child's blockref may
 102  * not match the blockref at (parent, index).
 103  */
 104 RB_HEAD(hammer2_chain_tree, hammer2_chain);
 105 TAILQ_HEAD(flush_deferral_list, hammer2_chain);
 106
 107 struct hammer2_chain {
 108         ccms_cst_t      cst;                    /* attr or data cst */
 109         struct hammer2_blockref bref;
 110         struct hammer2_blockref bref_flush;     /* synchronized w/MOVED bit */
 111         struct hammer2_chain    *parent;        /* return chain to root */
 112         struct hammer2_chain_tree rbhead;
 113         struct hammer2_state    *state;         /* if active cache msg */
 114         RB_ENTRY(hammer2_chain) rbnode;
 115         TAILQ_ENTRY(hammer2_chain) flush_node;  /* flush deferral list */
 116         union {
 117                 struct hammer2_inode *ip;
 118                 struct hammer2_indblock *np;
 119                 struct hammer2_data *dp;
 120                 void *mem;
 121         } u;
 122
 123         struct buf      *bp;            /* buffer cache (ro) */
 124         hammer2_media_data_t *data;     /* modified copy of data (rw) */
 125         u_int           bytes;          /* physical size of data */
 126         int             index;          /* index in parent */
 127         u_int           refs;
 128         u_int           flags;
 129 };
 130
 131 typedef struct hammer2_chain hammer2_chain_t;
 132
 133 int hammer2_chain_cmp(hammer2_chain_t *chain1, hammer2_chain_t *chain2);
 134 RB_PROTOTYPE(hammer2_chain_tree, hammer2_chain, rbnode, hammer2_chain_cmp);
 135
 136 /*
 137  * MOVED - This bit is set during the flush when the MODIFIED bit is cleared,
 138  *         indicating that the parent's blocktable must inherit a change to
 139  *         the bref (typically a block reallocation)
 140  *
 141  *         It must also be set in situations where a chain is not MODIFIED
 142  *         but whos bref has changed (typically due to fields other than
 143  *         a block reallocation).
 144  */
 145 #define HAMMER2_CHAIN_MODIFIED          0x00000001      /* active mods */
 146 #define HAMMER2_CHAIN_DIRTYEMBED        0x00000002      /* inode embedded */
 147 #define HAMMER2_CHAIN_DIRTYBP           0x00000004      /* dirty on unlock */
 148 #define HAMMER2_CHAIN_SUBMODIFIED       0x00000008      /* 1+ subs modified */
 149 #define HAMMER2_CHAIN_DELETED           0x00000010
 150 #define HAMMER2_CHAIN_INITIAL           0x00000020      /* initial create */
 151 #define HAMMER2_CHAIN_FLUSHED           0x00000040      /* flush on unlock */
 152 #define HAMMER2_CHAIN_MOVED             0x00000080      /* bref changed */
 153 #define HAMMER2_CHAIN_IOFLUSH           0x00000100      /* bawrite on put */
 154 #define HAMMER2_CHAIN_DEFERRED          0x00000200      /* on a deferral list*/
 155 #define HAMMER2_CHAIN_DESTROYED         0x00000400      /* destroying */
 156 #define HAMMER2_CHAIN_MODIFIED_AUX      0x00000800      /* hmp->vchain only */
 157 #define HAMMER2_CHAIN_MODIFY_TID        0x00001000      /* mod updates field */
 158 #define HAMMER2_CHAIN_MOUNTED           0x00002000      /* PFS is mounted */
 159
 160 /*
 161  * Flags passed to hammer2_chain_lookup() and hammer2_chain_next()
 162  */
 163 #define HAMMER2_LOOKUP_NOLOCK           0x00000001      /* ref only */
 164 #define HAMMER2_LOOKUP_NODATA           0x00000002      /* data left NULL */
 165 #define HAMMER2_LOOKUP_SHARED           0x00000100
 166
 167 /*
 168  * Flags passed to hammer2_chain_modify() and hammer2_chain_resize()
 169  *
 170  * NOTE: OPTDATA allows us to avoid instantiating buffers for INDIRECT
 171  *       blocks in the INITIAL-create state.
 172  *
 173  * NOTE: NO_MODIFY_TID tells the function to not set HAMMER2_CHAIN_MODIFY_TID
 174  *       when marking the chain modified (used when a sub-chain modification
 175  *       propagates upward).
 176  */
 177 #define HAMMER2_MODIFY_NOSUB            0x00000001      /* do not set SUBMOD */
 178 #define HAMMER2_MODIFY_OPTDATA          0x00000002      /* data can be NULL */
 179 #define HAMMER2_MODIFY_NO_MODIFY_TID    0x00000004
 180
 181 /*
 182  * Flags passed to hammer2_chain_lock()
 183  */
 184 #define HAMMER2_RESOLVE_NEVER           1
 185 #define HAMMER2_RESOLVE_MAYBE           2
 186 #define HAMMER2_RESOLVE_ALWAYS          3
 187 #define HAMMER2_RESOLVE_MASK            0x0F
 188
 189 #define HAMMER2_RESOLVE_SHARED          0x10
 190
 191 /*
 192  * Cluster different types of storage together for allocations
 193  */
 194 #define HAMMER2_FREECACHE_INODE         0
 195 #define HAMMER2_FREECACHE_INDIR         1
 196 #define HAMMER2_FREECACHE_DATA          2
 197 #define HAMMER2_FREECACHE_UNUSED3       3
 198 #define HAMMER2_FREECACHE_TYPES         4
 199
 200 /*
 201  * BMAP read-ahead maximum parameters
 202  */
 203 #define HAMMER2_BMAP_COUNT              16      /* max bmap read-ahead */
 204 #define HAMMER2_BMAP_BYTES              (HAMMER2_PBUFSIZE * HAMMER2_BMAP_COUNT)
 205
 206 /*
 207  * Misc
 208  */
 209 #define HAMMER2_FLUSH_DEPTH_LIMIT       40      /* stack recursion limit */
 210
 211 /*
 212  * HAMMER2 IN-MEMORY CACHE OF MEDIA STRUCTURES
 213  *
 214  * There is an in-memory representation of all on-media data structure.
 215  *
 216  * When accessed read-only the data will be mapped to the related buffer
 217  * cache buffer.
 218  *
 219  * When accessed read-write (marked modified) a kmalloc()'d copy of the
 220  * is created which can then be modified.  The copy is destroyed when a
 221  * filesystem block is allocated to replace it.
 222  *
 223  * Active inodes (those with vnodes attached) will maintain the kmalloc()'d
 224  * copy for both the read-only and the read-write case.  The combination of
 225  * (bp) and (data) determines whether (data) was allocated or not.
 226  *
 227  * The in-memory representation may remain cached (for example in order to
 228  * placemark clustering locks) even after the related data has been
 229  * detached.
 230  */
 231
 232 /*
 233  * A hammer2 inode.
 234  *
 235  * NOTE: The inode's attribute CST which is also used to lock the inode
 236  *       is embedded in the chain (chain.cst) and aliased w/ attr_cst.
 237  */
 238 struct hammer2_inode {
 239         struct hammer2_mount    *hmp;           /* Global mount */
 240         struct hammer2_pfsmount *pmp;           /* PFS mount */
 241         struct hammer2_inode    *pip;           /* parent inode */
 242         struct vnode            *vp;
 243         ccms_cst_t              topo_cst;       /* directory topology cst */
 244         hammer2_chain_t         chain;
 245         struct hammer2_inode_data ip_data;
 246         struct lockf            advlock;
 247         u_int                   depth;          /* directory depth */
 248         hammer2_off_t           delta_dcount;   /* adjust data_count */
 249         hammer2_off_t           delta_icount;   /* adjust inode_count */
 250 };
 251
 252 typedef struct hammer2_inode hammer2_inode_t;
 253
 254 /*
 255  * A hammer2 indirect block
 256  */
 257 struct hammer2_indblock {
 258         hammer2_chain_t         chain;
 259 };
 260
 261 typedef struct hammer2_indblock hammer2_indblock_t;
 262
 263 /*
 264  * A hammer2 data block
 265  */
 266 struct hammer2_data {
 267         hammer2_chain_t         chain;
 268 };
 269
 270 typedef struct hammer2_data hammer2_data_t;
 271
 272 struct hammer2_freecache {
 273         hammer2_off_t   bulk;
 274         hammer2_off_t   single;
 275 };
 276
 277 typedef struct hammer2_freecache hammer2_freecache_t;
 278
 279 /*
 280  * Global (per device) mount structure for device (aka vp->v_mount->hmp)
 281  */
 282 struct hammer2_mount {
 283         struct vnode    *devvp;         /* device vnode */
 284         int             ronly;          /* read-only mount */
 285         int             pmp_count;      /* PFS mounts backed by us */
 286         TAILQ_ENTRY(hammer2_mount) mntentry; /* hammer2_mntlist */
 287
 288         struct malloc_type *minode;
 289         int             ninodes;
 290         int             maxinodes;
 291
 292         struct malloc_type *mchain;
 293         int             nipstacks;
 294         int             maxipstacks;
 295         hammer2_chain_t vchain;         /* anchor chain */
 296         hammer2_chain_t *schain;        /* super-root */
 297         struct lock     alloclk;        /* lockmgr lock */
 298         struct lock     voldatalk;      /* lockmgr lock */
 299
 300         hammer2_volume_data_t voldata;
 301         hammer2_freecache_t freecache[HAMMER2_FREECACHE_TYPES]
 302                                      [HAMMER2_MAX_RADIX+1];
 303 };
 304
 305 typedef struct hammer2_mount hammer2_mount_t;
 306
 307 /*
 308  * Per-PFS mount structure for device (aka vp->v_mount)
 309  */
 310 struct hammer2_pfsmount {
 311         struct mount            *mp;            /* kernel mount */
 312         struct hammer2_mount    *hmp;           /* device global mount */
 313         hammer2_chain_t         *rchain;        /* PFS root chain */
 314         hammer2_inode_t         *iroot;         /* PFS root inode */
 315         ccms_domain_t           ccms_dom;
 316         struct netexport        export;         /* nfs export */
 317         int                     ronly;          /* read-only mount */
 318         struct malloc_type      *mmsg;
 319         kdmsg_iocom_t           iocom;
 320 };
 321
 322 typedef struct hammer2_pfsmount hammer2_pfsmount_t;
 323
 324 #if defined(_KERNEL)
 325
 326 MALLOC_DECLARE(M_HAMMER2);
 327
 328 #define VTOI(vp)        ((hammer2_inode_t *)(vp)->v_data)
 329 #define ITOV(ip)        ((ip)->vp)
 330
 331 static __inline
 332 hammer2_pfsmount_t *
 333 MPTOPMP(struct mount *mp)
 334 {
 335         return ((hammer2_pfsmount_t *)mp->mnt_data);
 336 }
 337
 338 static __inline
 339 hammer2_mount_t *
 340 MPTOHMP(struct mount *mp)
 341 {
 342         return (((hammer2_pfsmount_t *)mp->mnt_data)->hmp);
 343 }
 344
 345 extern struct vop_ops hammer2_vnode_vops;
 346 extern struct vop_ops hammer2_spec_vops;
 347 extern struct vop_ops hammer2_fifo_vops;
 348
 349 extern int hammer2_debug;
 350 extern int hammer2_cluster_enable;
 351 extern int hammer2_hardlink_enable;
 352 extern long hammer2_iod_file_read;
 353 extern long hammer2_iod_meta_read;
 354 extern long hammer2_iod_indr_read;
 355 extern long hammer2_iod_file_write;
 356 extern long hammer2_iod_meta_write;
 357 extern long hammer2_iod_indr_write;
 358 extern long hammer2_iod_volu_write;
 359 extern long hammer2_ioa_file_read;
 360 extern long hammer2_ioa_meta_read;
 361 extern long hammer2_ioa_indr_read;
 362 extern long hammer2_ioa_file_write;
 363 extern long hammer2_ioa_meta_write;
 364 extern long hammer2_ioa_indr_write;
 365 extern long hammer2_ioa_volu_write;
 366
 367 /*
 368  * hammer2_subr.c
 369  */
 370 #define hammer2_icrc32(buf, size)       iscsi_crc32((buf), (size))
 371 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc))
 372
 373 void hammer2_inode_lock_ex(hammer2_inode_t *ip);
 374 void hammer2_inode_unlock_ex(hammer2_inode_t *ip);
 375 void hammer2_inode_lock_sh(hammer2_inode_t *ip);
 376 void hammer2_inode_unlock_sh(hammer2_inode_t *ip);
 377 void hammer2_inode_busy(hammer2_inode_t *ip);
 378 void hammer2_inode_unbusy(hammer2_inode_t *ip);
 379 void hammer2_voldata_lock(hammer2_mount_t *hmp);
 380 void hammer2_voldata_unlock(hammer2_mount_t *hmp);
 381
 382 void hammer2_mount_exlock(hammer2_mount_t *hmp);
 383 void hammer2_mount_shlock(hammer2_mount_t *hmp);
 384 void hammer2_mount_unlock(hammer2_mount_t *hmp);
 385
 386 int hammer2_get_dtype(hammer2_inode_t *ip);
 387 int hammer2_get_vtype(hammer2_inode_t *ip);
 388 u_int8_t hammer2_get_obj_type(enum vtype vtype);
 389 void hammer2_time_to_timespec(u_int64_t xtime, struct timespec *ts);
 390 u_int64_t hammer2_timespec_to_time(struct timespec *ts);
 391 u_int32_t hammer2_to_unix_xid(uuid_t *uuid);
 392 void hammer2_guid_to_uuid(uuid_t *uuid, u_int32_t guid);
 393
 394 hammer2_key_t hammer2_dirhash(const unsigned char *name, size_t len);
 395 int hammer2_bytes_to_radix(size_t bytes);
 396
 397 int hammer2_calc_logical(hammer2_inode_t *ip, hammer2_off_t uoff,
 398                          hammer2_key_t *lbasep, hammer2_key_t *leofp);
 399 void hammer2_update_time(uint64_t *timep);
 400
 401 /*
 402  * hammer2_inode.c
 403  */
 404 struct vnode *hammer2_igetv(hammer2_inode_t *ip, int *errorp);
 405
 406 void hammer2_inode_lock_nlinks(hammer2_inode_t *ip);
 407 void hammer2_inode_unlock_nlinks(hammer2_inode_t *ip);
 408 hammer2_inode_t *hammer2_inode_alloc(hammer2_pfsmount_t *pmp, void *data);
 409 void hammer2_inode_free(hammer2_inode_t *ip);
 410 void hammer2_inode_ref(hammer2_inode_t *ip);
 411 void hammer2_inode_drop(hammer2_inode_t *ip);
 412 int hammer2_inode_calc_alloc(hammer2_key_t filesize);
 413
 414 int hammer2_inode_create(hammer2_inode_t *dip,
 415                         struct vattr *vap, struct ucred *cred,
 416                         const uint8_t *name, size_t name_len,
 417                         hammer2_inode_t **nipp);
 418
 419 int hammer2_inode_duplicate(hammer2_inode_t *dip,
 420                         hammer2_inode_t *oip, hammer2_inode_t **nipp,
 421                         const uint8_t *name, size_t name_len);
 422 int hammer2_inode_connect(hammer2_inode_t *dip, hammer2_inode_t *oip,
 423                         const uint8_t *name, size_t name_len);
 424
 425 int hammer2_unlink_file(hammer2_inode_t *dip,
 426                         const uint8_t *name, size_t name_len,
 427                         int isdir, hammer2_inode_t *retain_ip);
 428 int hammer2_hardlink_consolidate(hammer2_inode_t **ipp, hammer2_inode_t *tdip);
 429 int hammer2_hardlink_deconsolidate(hammer2_inode_t *dip,
 430                         hammer2_chain_t **chainp, hammer2_inode_t **ipp);
 431 int hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_chain_t **chainp,
 432                         hammer2_inode_t **ipp);
 433
 434 /*
 435  * hammer2_chain.c
 436  */
 437 void hammer2_modify_volume(hammer2_mount_t *hmp);
 438 hammer2_chain_t *hammer2_chain_alloc(hammer2_mount_t *hmp,
 439                                 hammer2_blockref_t *bref);
 440 void hammer2_chain_free(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 441 void hammer2_chain_ref(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 442 void hammer2_chain_drop(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 443 int hammer2_chain_lock(hammer2_mount_t *hmp, hammer2_chain_t *chain, int how);
 444 void hammer2_chain_moved(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 445 void hammer2_chain_modify(hammer2_mount_t *hmp, hammer2_chain_t *chain,
 446                                 int flags);
 447 void hammer2_chain_resize(hammer2_inode_t *ip, hammer2_chain_t *chain,
 448                                 int nradix, int flags);
 449 void hammer2_chain_unlock(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 450 hammer2_chain_t *hammer2_chain_find(hammer2_mount_t *hmp,
 451                                 hammer2_chain_t *parent, int index);
 452 hammer2_chain_t *hammer2_chain_get(hammer2_mount_t *hmp,
 453                                 hammer2_chain_t *parent,
 454                                 int index, int flags);
 455 hammer2_chain_t *hammer2_chain_lookup(hammer2_mount_t *hmp,
 456                                 hammer2_chain_t **parentp,
 457                                 hammer2_key_t key_beg, hammer2_key_t key_end,
 458                                 int flags);
 459 hammer2_chain_t *hammer2_chain_next(hammer2_mount_t *hmp,
 460                                 hammer2_chain_t **parentp,
 461                                 hammer2_chain_t *chain,
 462                                 hammer2_key_t key_beg, hammer2_key_t key_end,
 463                                 int flags);
 464 hammer2_chain_t *hammer2_chain_create(hammer2_mount_t *hmp,
 465                                 hammer2_chain_t *parent,
 466                                 hammer2_chain_t *chain,
 467                                 hammer2_key_t key, int keybits,
 468                                 int type, size_t bytes);
 469 void hammer2_chain_delete(hammer2_mount_t *hmp, hammer2_chain_t *parent,
 470                                 hammer2_chain_t *chain, int retain);
 471 void hammer2_chain_flush(hammer2_mount_t *hmp, hammer2_chain_t *chain,
 472                                 hammer2_tid_t modify_tid);
 473 void hammer2_chain_commit(hammer2_mount_t *hmp, hammer2_chain_t *chain);
 474
 475 /*
 476  * hammer2_ioctl.c
 477  */
 478 int hammer2_ioctl(hammer2_inode_t *ip, u_long com, void *data,
 479                                 int fflag, struct ucred *cred);
 480
 481 /*
 482  * hammer2_msgops.c
 483  */
 484 int hammer2_msg_dbg_rcvmsg(kdmsg_msg_t *msg);
 485 int hammer2_msg_adhoc_input(kdmsg_msg_t *msg);
 486
 487 /*
 488  * hammer2_vfsops.c
 489  */
 490 void hammer2_clusterctl_wakeup(kdmsg_iocom_t *iocom);
 491 void hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index);
 492 void hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp);
 493
 494 /*
 495  * hammer2_freemap.c
 496  */
 497 hammer2_off_t hammer2_freemap_alloc(hammer2_mount_t *hmp,
 498                                 int type, size_t bytes);
 499 void hammer2_freemap_free(hammer2_mount_t *hmp, hammer2_off_t data_off,
 500                                 int type);
 501
 502 #endif /* !_KERNEL */
 503 #endif /* !_VFS_HAMMER2_HAMMER2_H_ */