fs/gfs2/incore.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #ifndef __INCORE_DOT_H__
  11 #define __INCORE_DOT_H__
  12
  13 #include <linux/fs.h>
  14 #include <linux/workqueue.h>
  15
  16 #define DIO_WAIT        0x00000010
  17 #define DIO_METADATA    0x00000020
  18 #define DIO_ALL         0x00000100
  19
  20 struct gfs2_log_operations;
  21 struct gfs2_log_element;
  22 struct gfs2_holder;
  23 struct gfs2_glock;
  24 struct gfs2_quota_data;
  25 struct gfs2_trans;
  26 struct gfs2_ail;
  27 struct gfs2_jdesc;
  28 struct gfs2_sbd;
  29
  30 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  31
  32 struct gfs2_log_header_host {
  33         u64 lh_sequence;        /* Sequence number of this transaction */
  34         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  35         u32 lh_tail;            /* Block number of log tail */
  36         u32 lh_blkno;
  37         u32 lh_hash;
  38 };
  39
  40 /*
  41  * Structure of operations that are associated with each
  42  * type of element in the log.
  43  */
  44
  45 struct gfs2_log_operations {
  46         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  47         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  48         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  49         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  50                                 struct gfs2_log_header_host *head, int pass);
  51         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  52                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  53                                  int pass);
  54         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  55         const char *lo_name;
  56 };
  57
  58 struct gfs2_log_element {
  59         struct list_head le_list;
  60         const struct gfs2_log_operations *le_ops;
  61 };
  62
  63 struct gfs2_bitmap {
  64         struct buffer_head *bi_bh;
  65         char *bi_clone;
  66         u32 bi_offset;
  67         u32 bi_start;
  68         u32 bi_len;
  69 };
  70
  71 struct gfs2_rgrp_host {
  72         u32 rg_free;
  73         u32 rg_dinodes;
  74         u64 rg_igeneration;
  75 };
  76
  77 struct gfs2_rgrpd {
  78         struct list_head rd_list;       /* Link with superblock */
  79         struct list_head rd_list_mru;
  80         struct list_head rd_recent;     /* Recently used rgrps */
  81         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  82         u64 rd_addr;                    /* grp block disk address */
  83         u64 rd_data0;                   /* first data location */
  84         u32 rd_length;                  /* length of rgrp header in fs blocks */
  85         u32 rd_data;                    /* num of data blocks in rgrp */
  86         u32 rd_bitbytes;                /* number of bytes in data bitmaps */
  87         struct gfs2_rgrp_host rd_rg;
  88         u64 rd_rg_vn;
  89         struct gfs2_bitmap *rd_bits;
  90         unsigned int rd_bh_count;
  91         struct mutex rd_mutex;
  92         u32 rd_free_clone;
  93         struct gfs2_log_element rd_le;
  94         u32 rd_last_alloc_data;
  95         u32 rd_last_alloc_meta;
  96         struct gfs2_sbd *rd_sbd;
  97         unsigned char rd_flags;
  98 #define GFS2_RDF_CHECK        0x01      /* Need to check for unlinked inodes */
  99 #define GFS2_RDF_NOALLOC      0x02      /* rg prohibits allocation */
 100 };
 101
 102 enum gfs2_state_bits {
 103         BH_Pinned = BH_PrivateStart,
 104         BH_Escaped = BH_PrivateStart + 1,
 105 };
 106
 107 BUFFER_FNS(Pinned, pinned)
 108 TAS_BUFFER_FNS(Pinned, pinned)
 109 BUFFER_FNS(Escaped, escaped)
 110 TAS_BUFFER_FNS(Escaped, escaped)
 111
 112 struct gfs2_bufdata {
 113         struct buffer_head *bd_bh;
 114         struct gfs2_glock *bd_gl;
 115
 116         union {
 117                 struct list_head list_tr;
 118                 u64 blkno;
 119         } u;
 120 #define bd_list_tr u.list_tr
 121 #define bd_blkno u.blkno
 122
 123         struct gfs2_log_element bd_le;
 124
 125         struct gfs2_ail *bd_ail;
 126         struct list_head bd_ail_st_list;
 127         struct list_head bd_ail_gl_list;
 128 };
 129
 130 struct gfs2_glock_operations {
 131         void (*go_xmote_th) (struct gfs2_glock *gl);
 132         void (*go_xmote_bh) (struct gfs2_glock *gl);
 133         void (*go_inval) (struct gfs2_glock *gl, int flags);
 134         int (*go_demote_ok) (struct gfs2_glock *gl);
 135         int (*go_lock) (struct gfs2_holder *gh);
 136         void (*go_unlock) (struct gfs2_holder *gh);
 137         const int go_type;
 138         const unsigned long go_min_hold_time;
 139 };
 140
 141 enum {
 142         /* States */
 143         HIF_HOLDER              = 6,
 144         HIF_FIRST               = 7,
 145         HIF_ABORTED             = 9,
 146         HIF_WAIT                = 10,
 147 };
 148
 149 struct gfs2_holder {
 150         struct list_head gh_list;
 151
 152         struct gfs2_glock *gh_gl;
 153         struct pid *gh_owner_pid;
 154         unsigned int gh_state;
 155         unsigned gh_flags;
 156
 157         int gh_error;
 158         unsigned long gh_iflags;
 159         unsigned long gh_ip;
 160 };
 161
 162 enum {
 163         GLF_LOCK                = 1,
 164         GLF_STICKY              = 2,
 165         GLF_DEMOTE              = 3,
 166         GLF_PENDING_DEMOTE      = 4,
 167         GLF_DIRTY               = 5,
 168         GLF_DEMOTE_IN_PROGRESS  = 6,
 169         GLF_LFLUSH              = 7,
 170         GLF_WAITERS2            = 8,
 171 };
 172
 173 struct gfs2_glock {
 174         struct hlist_node gl_list;
 175         unsigned long gl_flags;         /* GLF_... */
 176         struct lm_lockname gl_name;
 177         atomic_t gl_ref;
 178
 179         spinlock_t gl_spin;
 180
 181         unsigned int gl_state;
 182         unsigned int gl_hash;
 183         unsigned int gl_demote_state; /* state requested by remote node */
 184         unsigned long gl_demote_time; /* time of first demote request */
 185         struct pid *gl_owner_pid;
 186         unsigned long gl_ip;
 187         struct list_head gl_holders;
 188         struct list_head gl_waiters1;   /* HIF_MUTEX */
 189         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 190
 191         const struct gfs2_glock_operations *gl_ops;
 192
 193         struct gfs2_holder *gl_req_gh;
 194
 195         void *gl_lock;
 196         char *gl_lvb;
 197         atomic_t gl_lvb_count;
 198
 199         u64 gl_vn;
 200         unsigned long gl_stamp;
 201         unsigned long gl_tchange;
 202         void *gl_object;
 203
 204         struct list_head gl_reclaim;
 205
 206         struct gfs2_sbd *gl_sbd;
 207
 208         struct inode *gl_aspace;
 209         struct list_head gl_ail_list;
 210         atomic_t gl_ail_count;
 211         struct delayed_work gl_work;
 212 };
 213
 214 #define GFS2_MIN_LVB_SIZE 32    /* Min size of LVB that gfs2 supports */
 215
 216 struct gfs2_alloc {
 217         /* Quota stuff */
 218
 219         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 220         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 221         unsigned int al_qd_num;
 222
 223         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 224         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 225
 226         /* Filled in by gfs2_inplace_reserve() */
 227
 228         unsigned int al_line;
 229         char *al_file;
 230         struct gfs2_holder al_ri_gh;
 231         struct gfs2_holder al_rgd_gh;
 232         struct gfs2_rgrpd *al_rgd;
 233
 234 };
 235
 236 enum {
 237         GIF_INVALID             = 0,
 238         GIF_QD_LOCKED           = 1,
 239         GIF_SW_PAGED            = 3,
 240 };
 241
 242 struct gfs2_dinode_host {
 243         u64 di_size;            /* number of bytes in file */
 244         u64 di_blocks;          /* number of blocks in file */
 245         u64 di_goal_meta;       /* rgrp to alloc from next */
 246         u64 di_goal_data;       /* data block goal */
 247         u64 di_generation;      /* generation number for NFS */
 248         u32 di_flags;           /* GFS2_DIF_... */
 249         /* These only apply to directories  */
 250         u16 di_depth;           /* Number of bits in the table */
 251         u32 di_entries;         /* The number of entries in the directory */
 252         u64 di_eattr;           /* extended attribute block number */
 253 };
 254
 255 struct gfs2_inode {
 256         struct inode i_inode;
 257         u64 i_no_addr;
 258         u64 i_no_formal_ino;
 259         unsigned long i_flags;          /* GIF_... */
 260
 261         struct gfs2_dinode_host i_di; /* To be replaced by ref to block */
 262
 263         struct gfs2_glock *i_gl; /* Move into i_gh? */
 264         struct gfs2_holder i_iopen_gh;
 265         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 266         struct gfs2_alloc *i_alloc;
 267         u64 i_last_rg_alloc;
 268
 269         struct rw_semaphore i_rw_mutex;
 270         u8 i_height;
 271 };
 272
 273 /*
 274  * Since i_inode is the first element of struct gfs2_inode,
 275  * this is effectively a cast.
 276  */
 277 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 278 {
 279         return container_of(inode, struct gfs2_inode, i_inode);
 280 }
 281
 282 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 283 {
 284         return inode->i_sb->s_fs_info;
 285 }
 286
 287 struct gfs2_file {
 288         struct mutex f_fl_mutex;
 289         struct gfs2_holder f_fl_gh;
 290 };
 291
 292 struct gfs2_revoke_replay {
 293         struct list_head rr_list;
 294         u64 rr_blkno;
 295         unsigned int rr_where;
 296 };
 297
 298 enum {
 299         QDF_USER                = 0,
 300         QDF_CHANGE              = 1,
 301         QDF_LOCKED              = 2,
 302 };
 303
 304 struct gfs2_quota_data {
 305         struct list_head qd_list;
 306         unsigned int qd_count;
 307
 308         u32 qd_id;
 309         unsigned long qd_flags;         /* QDF_... */
 310
 311         s64 qd_change;
 312         s64 qd_change_sync;
 313
 314         unsigned int qd_slot;
 315         unsigned int qd_slot_count;
 316
 317         struct buffer_head *qd_bh;
 318         struct gfs2_quota_change *qd_bh_qc;
 319         unsigned int qd_bh_count;
 320
 321         struct gfs2_glock *qd_gl;
 322         struct gfs2_quota_lvb qd_qb;
 323
 324         u64 qd_sync_gen;
 325         unsigned long qd_last_warn;
 326         unsigned long qd_last_touched;
 327 };
 328
 329 struct gfs2_trans {
 330         unsigned long tr_ip;
 331
 332         unsigned int tr_blocks;
 333         unsigned int tr_revokes;
 334         unsigned int tr_reserved;
 335
 336         struct gfs2_holder tr_t_gh;
 337
 338         int tr_touched;
 339
 340         unsigned int tr_num_buf;
 341         unsigned int tr_num_buf_new;
 342         unsigned int tr_num_databuf_new;
 343         unsigned int tr_num_buf_rm;
 344         unsigned int tr_num_databuf_rm;
 345         struct list_head tr_list_buf;
 346
 347         unsigned int tr_num_revoke;
 348         unsigned int tr_num_revoke_rm;
 349 };
 350
 351 struct gfs2_ail {
 352         struct list_head ai_list;
 353
 354         unsigned int ai_first;
 355         struct list_head ai_ail1_list;
 356         struct list_head ai_ail2_list;
 357
 358         u64 ai_sync_gen;
 359 };
 360
 361 struct gfs2_journal_extent {
 362         struct list_head extent_list;
 363
 364         unsigned int lblock; /* First logical block */
 365         u64 dblock; /* First disk block */
 366         u64 blocks;
 367 };
 368
 369 struct gfs2_jdesc {
 370         struct list_head jd_list;
 371         struct list_head extent_list;
 372
 373         struct inode *jd_inode;
 374         unsigned int jd_jid;
 375         int jd_dirty;
 376
 377         unsigned int jd_blocks;
 378 };
 379
 380 struct gfs2_statfs_change_host {
 381         s64 sc_total;
 382         s64 sc_free;
 383         s64 sc_dinodes;
 384 };
 385
 386 #define GFS2_GLOCKD_DEFAULT     1
 387 #define GFS2_GLOCKD_MAX         16
 388
 389 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 390 #define GFS2_QUOTA_OFF          0
 391 #define GFS2_QUOTA_ACCOUNT      1
 392 #define GFS2_QUOTA_ON           2
 393
 394 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 395 #define GFS2_DATA_WRITEBACK     1
 396 #define GFS2_DATA_ORDERED       2
 397
 398 struct gfs2_args {
 399         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 400         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 401         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 402         int ar_spectator; /* Don't get a journal because we're always RO */
 403         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 404         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 405         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 406         int ar_debug; /* Oops on errors instead of trying to be graceful */
 407         int ar_upgrade; /* Upgrade ondisk/multihost format */
 408         unsigned int ar_num_glockd; /* Number of glockd threads */
 409         int ar_posix_acl; /* Enable posix acls */
 410         int ar_quota; /* off/account/on */
 411         int ar_suiddir; /* suiddir support */
 412         int ar_data; /* ordered/writeback */
 413 };
 414
 415 struct gfs2_tune {
 416         spinlock_t gt_spin;
 417
 418         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 419         unsigned int gt_incore_log_blocks;
 420         unsigned int gt_log_flush_secs;
 421
 422         unsigned int gt_recoverd_secs;
 423         unsigned int gt_logd_secs;
 424         unsigned int gt_quotad_secs;
 425
 426         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 427         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 428         unsigned int gt_quota_scale_num; /* Numerator */
 429         unsigned int gt_quota_scale_den; /* Denominator */
 430         unsigned int gt_quota_cache_secs;
 431         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 432         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 433         unsigned int gt_new_files_jdata;
 434         unsigned int gt_new_files_directio;
 435         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 436         unsigned int gt_stall_secs; /* Detects trouble! */
 437         unsigned int gt_complain_secs;
 438         unsigned int gt_statfs_quantum;
 439         unsigned int gt_statfs_slow;
 440 };
 441
 442 enum {
 443         SDF_JOURNAL_CHECKED     = 0,
 444         SDF_JOURNAL_LIVE        = 1,
 445         SDF_SHUTDOWN            = 2,
 446         SDF_NOATIME             = 3,
 447 };
 448
 449 #define GFS2_FSNAME_LEN         256
 450
 451 struct gfs2_inum_host {
 452         u64 no_formal_ino;
 453         u64 no_addr;
 454 };
 455
 456 struct gfs2_sb_host {
 457         u32 sb_magic;
 458         u32 sb_type;
 459         u32 sb_format;
 460
 461         u32 sb_fs_format;
 462         u32 sb_multihost_format;
 463         u32 sb_bsize;
 464         u32 sb_bsize_shift;
 465
 466         struct gfs2_inum_host sb_master_dir;
 467         struct gfs2_inum_host sb_root_dir;
 468
 469         char sb_lockproto[GFS2_LOCKNAME_LEN];
 470         char sb_locktable[GFS2_LOCKNAME_LEN];
 471 };
 472
 473 struct gfs2_sbd {
 474         struct super_block *sd_vfs;
 475         struct super_block *sd_vfs_meta;
 476         struct kobject sd_kobj;
 477         unsigned long sd_flags; /* SDF_... */
 478         struct gfs2_sb_host sd_sb;
 479
 480         /* Constants computed on mount */
 481
 482         u32 sd_fsb2bb;
 483         u32 sd_fsb2bb_shift;
 484         u32 sd_diptrs;  /* Number of pointers in a dinode */
 485         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 486         u32 sd_jbsize;  /* Size of a journaled data block */
 487         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 488         u32 sd_hash_bsize_shift;
 489         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 490         u32 sd_qc_per_block;
 491         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 492         u32 sd_max_height;      /* Max height of a file's metadata tree */
 493         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 494         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 495         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 496
 497         struct gfs2_args sd_args;       /* Mount arguments */
 498         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 499
 500         /* Lock Stuff */
 501
 502         struct lm_lockstruct sd_lockstruct;
 503         struct list_head sd_reclaim_list;
 504         spinlock_t sd_reclaim_lock;
 505         wait_queue_head_t sd_reclaim_wq;
 506         atomic_t sd_reclaim_count;
 507         struct gfs2_holder sd_live_gh;
 508         struct gfs2_glock *sd_rename_gl;
 509         struct gfs2_glock *sd_trans_gl;
 510
 511         /* Inode Stuff */
 512
 513         struct inode *sd_master_dir;
 514         struct inode *sd_jindex;
 515         struct inode *sd_inum_inode;
 516         struct inode *sd_statfs_inode;
 517         struct inode *sd_ir_inode;
 518         struct inode *sd_sc_inode;
 519         struct inode *sd_qc_inode;
 520         struct inode *sd_rindex;
 521         struct inode *sd_quota_inode;
 522
 523         /* Inum stuff */
 524
 525         struct mutex sd_inum_mutex;
 526
 527         /* StatFS stuff */
 528
 529         spinlock_t sd_statfs_spin;
 530         struct gfs2_statfs_change_host sd_statfs_master;
 531         struct gfs2_statfs_change_host sd_statfs_local;
 532         unsigned long sd_statfs_sync_time;
 533
 534         /* Resource group stuff */
 535
 536         u64 sd_rindex_vn;
 537         spinlock_t sd_rindex_spin;
 538         struct mutex sd_rindex_mutex;
 539         struct list_head sd_rindex_list;
 540         struct list_head sd_rindex_mru_list;
 541         struct list_head sd_rindex_recent_list;
 542         struct gfs2_rgrpd *sd_rindex_forward;
 543         unsigned int sd_rgrps;
 544
 545         /* Journal index stuff */
 546
 547         struct list_head sd_jindex_list;
 548         spinlock_t sd_jindex_spin;
 549         struct mutex sd_jindex_mutex;
 550         unsigned int sd_journals;
 551         unsigned long sd_jindex_refresh_time;
 552
 553         struct gfs2_jdesc *sd_jdesc;
 554         struct gfs2_holder sd_journal_gh;
 555         struct gfs2_holder sd_jinode_gh;
 556
 557         struct gfs2_holder sd_ir_gh;
 558         struct gfs2_holder sd_sc_gh;
 559         struct gfs2_holder sd_qc_gh;
 560
 561         /* Daemon stuff */
 562
 563         struct task_struct *sd_recoverd_process;
 564         struct task_struct *sd_logd_process;
 565         struct task_struct *sd_quotad_process;
 566         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 567         unsigned int sd_glockd_num;
 568
 569         /* Quota stuff */
 570
 571         struct list_head sd_quota_list;
 572         atomic_t sd_quota_count;
 573         spinlock_t sd_quota_spin;
 574         struct mutex sd_quota_mutex;
 575
 576         unsigned int sd_quota_slots;
 577         unsigned int sd_quota_chunks;
 578         unsigned char **sd_quota_bitmap;
 579
 580         u64 sd_quota_sync_gen;
 581         unsigned long sd_quota_sync_time;
 582
 583         /* Log stuff */
 584
 585         spinlock_t sd_log_lock;
 586
 587         unsigned int sd_log_blks_reserved;
 588         unsigned int sd_log_commited_buf;
 589         unsigned int sd_log_commited_databuf;
 590         unsigned int sd_log_commited_revoke;
 591
 592         unsigned int sd_log_num_buf;
 593         unsigned int sd_log_num_revoke;
 594         unsigned int sd_log_num_rg;
 595         unsigned int sd_log_num_databuf;
 596
 597         struct list_head sd_log_le_buf;
 598         struct list_head sd_log_le_revoke;
 599         struct list_head sd_log_le_rg;
 600         struct list_head sd_log_le_databuf;
 601         struct list_head sd_log_le_ordered;
 602
 603         atomic_t sd_log_blks_free;
 604         struct mutex sd_log_reserve_mutex;
 605
 606         u64 sd_log_sequence;
 607         unsigned int sd_log_head;
 608         unsigned int sd_log_tail;
 609         int sd_log_idle;
 610
 611         unsigned long sd_log_flush_time;
 612         struct rw_semaphore sd_log_flush_lock;
 613         atomic_t sd_log_in_flight;
 614         wait_queue_head_t sd_log_flush_wait;
 615
 616         unsigned int sd_log_flush_head;
 617         u64 sd_log_flush_wrapped;
 618
 619         struct list_head sd_ail1_list;
 620         struct list_head sd_ail2_list;
 621         u64 sd_ail_sync_gen;
 622
 623         /* Replay stuff */
 624
 625         struct list_head sd_revoke_list;
 626         unsigned int sd_replay_tail;
 627
 628         unsigned int sd_found_blocks;
 629         unsigned int sd_found_revokes;
 630         unsigned int sd_replayed_blocks;
 631
 632         /* For quiescing the filesystem */
 633
 634         struct gfs2_holder sd_freeze_gh;
 635         struct mutex sd_freeze_lock;
 636         unsigned int sd_freeze_count;
 637
 638         /* Counters */
 639
 640         atomic_t sd_glock_count;
 641         atomic_t sd_glock_held_count;
 642         atomic_t sd_inode_count;
 643         atomic_t sd_reclaimed;
 644
 645         char sd_fsname[GFS2_FSNAME_LEN];
 646         char sd_table_name[GFS2_FSNAME_LEN];
 647         char sd_proto_name[GFS2_FSNAME_LEN];
 648
 649         /* Debugging crud */
 650
 651         unsigned long sd_last_warning;
 652         struct vfsmount *sd_gfs2mnt;
 653         struct dentry *debugfs_dir;    /* debugfs directory */
 654         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 655 };
 656
 657 #endif /* __INCORE_DOT_H__ */
 658