fs/gfs2/incore.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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_incore_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  48         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  49         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  50         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  51                                 struct gfs2_log_header_host *head, int pass);
  52         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  53                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  54                                  int pass);
  55         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  56         const char *lo_name;
  57 };
  58
  59 struct gfs2_log_element {
  60         struct list_head le_list;
  61         const struct gfs2_log_operations *le_ops;
  62 };
  63
  64 struct gfs2_bitmap {
  65         struct buffer_head *bi_bh;
  66         char *bi_clone;
  67         u32 bi_offset;
  68         u32 bi_start;
  69         u32 bi_len;
  70 };
  71
  72 struct gfs2_rgrp_host {
  73         u32 rg_flags;
  74         u32 rg_free;
  75         u32 rg_dinodes;
  76         u64 rg_igeneration;
  77 };
  78
  79 struct gfs2_rgrpd {
  80         struct list_head rd_list;       /* Link with superblock */
  81         struct list_head rd_list_mru;
  82         struct list_head rd_recent;     /* Recently used rgrps */
  83         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  84         u64 rd_addr;                    /* grp block disk address */
  85         u64 rd_data0;                   /* first data location */
  86         u32 rd_length;                  /* length of rgrp header in fs blocks */
  87         u32 rd_data;                    /* num of data blocks in rgrp */
  88         u32 rd_bitbytes;                /* number of bytes in data bitmaps */
  89         struct gfs2_rgrp_host rd_rg;
  90         u64 rd_rg_vn;
  91         struct gfs2_bitmap *rd_bits;
  92         unsigned int rd_bh_count;
  93         struct mutex rd_mutex;
  94         u32 rd_free_clone;
  95         struct gfs2_log_element rd_le;
  96         u32 rd_last_alloc_data;
  97         u32 rd_last_alloc_meta;
  98         struct gfs2_sbd *rd_sbd;
  99         unsigned long rd_flags;
 100 #define GFS2_RDF_CHECK        0x0001          /* Need to check for unlinked inodes */
 101 };
 102
 103 enum gfs2_state_bits {
 104         BH_Pinned = BH_PrivateStart,
 105         BH_Escaped = BH_PrivateStart + 1,
 106 };
 107
 108 BUFFER_FNS(Pinned, pinned)
 109 TAS_BUFFER_FNS(Pinned, pinned)
 110 BUFFER_FNS(Escaped, escaped)
 111 TAS_BUFFER_FNS(Escaped, escaped)
 112
 113 struct gfs2_bufdata {
 114         struct buffer_head *bd_bh;
 115         struct gfs2_glock *bd_gl;
 116
 117         union {
 118                 struct list_head list_tr;
 119                 u64 blkno;
 120         } u;
 121 #define bd_list_tr u.list_tr
 122 #define bd_blkno u.blkno
 123
 124         struct gfs2_log_element bd_le;
 125
 126         struct gfs2_ail *bd_ail;
 127         struct list_head bd_ail_st_list;
 128         struct list_head bd_ail_gl_list;
 129 };
 130
 131 struct gfs2_glock_operations {
 132         void (*go_xmote_th) (struct gfs2_glock *gl);
 133         void (*go_xmote_bh) (struct gfs2_glock *gl);
 134         void (*go_drop_th) (struct gfs2_glock *gl);
 135         void (*go_inval) (struct gfs2_glock *gl, int flags);
 136         int (*go_demote_ok) (struct gfs2_glock *gl);
 137         int (*go_lock) (struct gfs2_holder *gh);
 138         void (*go_unlock) (struct gfs2_holder *gh);
 139         const int go_type;
 140         const unsigned long go_min_hold_time;
 141 };
 142
 143 enum {
 144         /* States */
 145         HIF_HOLDER              = 6,
 146         HIF_FIRST               = 7,
 147         HIF_ABORTED             = 9,
 148         HIF_WAIT                = 10,
 149 };
 150
 151 struct gfs2_holder {
 152         struct list_head gh_list;
 153
 154         struct gfs2_glock *gh_gl;
 155         pid_t gh_owner_pid;
 156         unsigned int gh_state;
 157         unsigned gh_flags;
 158
 159         int gh_error;
 160         unsigned long gh_iflags;
 161         unsigned long gh_ip;
 162 };
 163
 164 enum {
 165         GLF_LOCK                = 1,
 166         GLF_STICKY              = 2,
 167         GLF_DEMOTE              = 3,
 168         GLF_PENDING_DEMOTE      = 4,
 169         GLF_DIRTY               = 5,
 170         GLF_DEMOTE_IN_PROGRESS  = 6,
 171         GLF_LFLUSH              = 7,
 172 };
 173
 174 struct gfs2_glock {
 175         struct hlist_node gl_list;
 176         unsigned long gl_flags;         /* GLF_... */
 177         struct lm_lockname gl_name;
 178         atomic_t gl_ref;
 179
 180         spinlock_t gl_spin;
 181
 182         unsigned int gl_state;
 183         unsigned int gl_hash;
 184         unsigned int gl_demote_state; /* state requested by remote node */
 185         unsigned long gl_demote_time; /* time of first demote request */
 186         pid_t gl_owner_pid;
 187         unsigned long gl_ip;
 188         struct list_head gl_holders;
 189         struct list_head gl_waiters1;   /* HIF_MUTEX */
 190         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 191         int gl_waiters2;                /* GIF_DEMOTE */
 192
 193         const struct gfs2_glock_operations *gl_ops;
 194
 195         struct gfs2_holder *gl_req_gh;
 196         gfs2_glop_bh_t gl_req_bh;
 197
 198         void *gl_lock;
 199         char *gl_lvb;
 200         atomic_t gl_lvb_count;
 201
 202         u64 gl_vn;
 203         unsigned long gl_stamp;
 204         unsigned long gl_tchange;
 205         void *gl_object;
 206
 207         struct list_head gl_reclaim;
 208
 209         struct gfs2_sbd *gl_sbd;
 210
 211         struct inode *gl_aspace;
 212         struct list_head gl_ail_list;
 213         atomic_t gl_ail_count;
 214         struct delayed_work gl_work;
 215 };
 216
 217 struct gfs2_alloc {
 218         /* Quota stuff */
 219
 220         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 221         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 222         unsigned int al_qd_num;
 223
 224         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 225         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 226
 227         /* Filled in by gfs2_inplace_reserve() */
 228
 229         unsigned int al_line;
 230         char *al_file;
 231         struct gfs2_holder al_ri_gh;
 232         struct gfs2_holder al_rgd_gh;
 233         struct gfs2_rgrpd *al_rgd;
 234
 235 };
 236
 237 enum {
 238         GIF_INVALID             = 0,
 239         GIF_QD_LOCKED           = 1,
 240         GIF_SW_PAGED            = 3,
 241 };
 242
 243 struct gfs2_dinode_host {
 244         u64 di_size;            /* number of bytes in file */
 245         u64 di_blocks;          /* number of blocks in file */
 246         u64 di_goal_meta;       /* rgrp to alloc from next */
 247         u64 di_goal_data;       /* data block goal */
 248         u64 di_generation;      /* generation number for NFS */
 249         u32 di_flags;           /* GFS2_DIF_... */
 250         u16 di_height;          /* height of metadata */
 251         /* These only apply to directories  */
 252         u16 di_depth;           /* Number of bits in the table */
 253         u32 di_entries;         /* The number of entries in the directory */
 254         u64 di_eattr;           /* extended attribute block number */
 255 };
 256
 257 struct gfs2_inode {
 258         struct inode i_inode;
 259         u64 i_no_addr;
 260         u64 i_no_formal_ino;
 261         unsigned long i_flags;          /* GIF_... */
 262
 263         struct gfs2_dinode_host i_di; /* To be replaced by ref to block */
 264
 265         struct gfs2_glock *i_gl; /* Move into i_gh? */
 266         struct gfs2_holder i_iopen_gh;
 267         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 268         struct gfs2_alloc i_alloc;
 269         u64 i_last_rg_alloc;
 270
 271         spinlock_t i_spin;
 272         struct rw_semaphore i_rw_mutex;
 273 };
 274
 275 /*
 276  * Since i_inode is the first element of struct gfs2_inode,
 277  * this is effectively a cast.
 278  */
 279 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 280 {
 281         return container_of(inode, struct gfs2_inode, i_inode);
 282 }
 283
 284 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 285 {
 286         return inode->i_sb->s_fs_info;
 287 }
 288
 289 struct gfs2_file {
 290         struct mutex f_fl_mutex;
 291         struct gfs2_holder f_fl_gh;
 292 };
 293
 294 struct gfs2_revoke_replay {
 295         struct list_head rr_list;
 296         u64 rr_blkno;
 297         unsigned int rr_where;
 298 };
 299
 300 enum {
 301         QDF_USER                = 0,
 302         QDF_CHANGE              = 1,
 303         QDF_LOCKED              = 2,
 304 };
 305
 306 struct gfs2_quota_data {
 307         struct list_head qd_list;
 308         unsigned int qd_count;
 309
 310         u32 qd_id;
 311         unsigned long qd_flags;         /* QDF_... */
 312
 313         s64 qd_change;
 314         s64 qd_change_sync;
 315
 316         unsigned int qd_slot;
 317         unsigned int qd_slot_count;
 318
 319         struct buffer_head *qd_bh;
 320         struct gfs2_quota_change *qd_bh_qc;
 321         unsigned int qd_bh_count;
 322
 323         struct gfs2_glock *qd_gl;
 324         struct gfs2_quota_lvb qd_qb;
 325
 326         u64 qd_sync_gen;
 327         unsigned long qd_last_warn;
 328         unsigned long qd_last_touched;
 329 };
 330
 331 struct gfs2_trans {
 332         unsigned long tr_ip;
 333
 334         unsigned int tr_blocks;
 335         unsigned int tr_revokes;
 336         unsigned int tr_reserved;
 337
 338         struct gfs2_holder tr_t_gh;
 339
 340         int tr_touched;
 341
 342         unsigned int tr_num_buf;
 343         unsigned int tr_num_buf_new;
 344         unsigned int tr_num_databuf_new;
 345         unsigned int tr_num_buf_rm;
 346         unsigned int tr_num_databuf_rm;
 347         struct list_head tr_list_buf;
 348
 349         unsigned int tr_num_revoke;
 350         unsigned int tr_num_revoke_rm;
 351 };
 352
 353 struct gfs2_ail {
 354         struct list_head ai_list;
 355
 356         unsigned int ai_first;
 357         struct list_head ai_ail1_list;
 358         struct list_head ai_ail2_list;
 359
 360         u64 ai_sync_gen;
 361 };
 362
 363 struct gfs2_jdesc {
 364         struct list_head jd_list;
 365
 366         struct inode *jd_inode;
 367         unsigned int jd_jid;
 368         int jd_dirty;
 369
 370         unsigned int jd_blocks;
 371 };
 372
 373 struct gfs2_statfs_change_host {
 374         s64 sc_total;
 375         s64 sc_free;
 376         s64 sc_dinodes;
 377 };
 378
 379 #define GFS2_GLOCKD_DEFAULT     1
 380 #define GFS2_GLOCKD_MAX         16
 381
 382 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 383 #define GFS2_QUOTA_OFF          0
 384 #define GFS2_QUOTA_ACCOUNT      1
 385 #define GFS2_QUOTA_ON           2
 386
 387 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 388 #define GFS2_DATA_WRITEBACK     1
 389 #define GFS2_DATA_ORDERED       2
 390
 391 struct gfs2_args {
 392         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 393         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 394         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 395         int ar_spectator; /* Don't get a journal because we're always RO */
 396         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 397         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 398         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 399         int ar_debug; /* Oops on errors instead of trying to be graceful */
 400         int ar_upgrade; /* Upgrade ondisk/multihost format */
 401         unsigned int ar_num_glockd; /* Number of glockd threads */
 402         int ar_posix_acl; /* Enable posix acls */
 403         int ar_quota; /* off/account/on */
 404         int ar_suiddir; /* suiddir support */
 405         int ar_data; /* ordered/writeback */
 406 };
 407
 408 struct gfs2_tune {
 409         spinlock_t gt_spin;
 410
 411         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 412         unsigned int gt_incore_log_blocks;
 413         unsigned int gt_log_flush_secs;
 414         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 415
 416         unsigned int gt_recoverd_secs;
 417         unsigned int gt_logd_secs;
 418         unsigned int gt_quotad_secs;
 419
 420         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 421         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 422         unsigned int gt_quota_scale_num; /* Numerator */
 423         unsigned int gt_quota_scale_den; /* Denominator */
 424         unsigned int gt_quota_cache_secs;
 425         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 426         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 427         unsigned int gt_new_files_jdata;
 428         unsigned int gt_new_files_directio;
 429         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 430         unsigned int gt_stall_secs; /* Detects trouble! */
 431         unsigned int gt_complain_secs;
 432         unsigned int gt_statfs_quantum;
 433         unsigned int gt_statfs_slow;
 434 };
 435
 436 enum {
 437         SDF_JOURNAL_CHECKED     = 0,
 438         SDF_JOURNAL_LIVE        = 1,
 439         SDF_SHUTDOWN            = 2,
 440         SDF_NOATIME             = 3,
 441 };
 442
 443 #define GFS2_FSNAME_LEN         256
 444
 445 struct gfs2_inum_host {
 446         u64 no_formal_ino;
 447         u64 no_addr;
 448 };
 449
 450 struct gfs2_sb_host {
 451         u32 sb_magic;
 452         u32 sb_type;
 453         u32 sb_format;
 454
 455         u32 sb_fs_format;
 456         u32 sb_multihost_format;
 457         u32 sb_bsize;
 458         u32 sb_bsize_shift;
 459
 460         struct gfs2_inum_host sb_master_dir;
 461         struct gfs2_inum_host sb_root_dir;
 462
 463         char sb_lockproto[GFS2_LOCKNAME_LEN];
 464         char sb_locktable[GFS2_LOCKNAME_LEN];
 465 };
 466
 467 struct gfs2_sbd {
 468         struct super_block *sd_vfs;
 469         struct super_block *sd_vfs_meta;
 470         struct kobject sd_kobj;
 471         unsigned long sd_flags; /* SDF_... */
 472         struct gfs2_sb_host sd_sb;
 473
 474         /* Constants computed on mount */
 475
 476         u32 sd_fsb2bb;
 477         u32 sd_fsb2bb_shift;
 478         u32 sd_diptrs;  /* Number of pointers in a dinode */
 479         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 480         u32 sd_jbsize;  /* Size of a journaled data block */
 481         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 482         u32 sd_hash_bsize_shift;
 483         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 484         u32 sd_qc_per_block;
 485         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 486         u32 sd_max_height;      /* Max height of a file's metadata tree */
 487         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 488         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 489         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 490
 491         struct gfs2_args sd_args;       /* Mount arguments */
 492         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 493
 494         /* Lock Stuff */
 495
 496         struct lm_lockstruct sd_lockstruct;
 497         struct list_head sd_reclaim_list;
 498         spinlock_t sd_reclaim_lock;
 499         wait_queue_head_t sd_reclaim_wq;
 500         atomic_t sd_reclaim_count;
 501         struct gfs2_holder sd_live_gh;
 502         struct gfs2_glock *sd_rename_gl;
 503         struct gfs2_glock *sd_trans_gl;
 504
 505         /* Inode Stuff */
 506
 507         struct inode *sd_master_dir;
 508         struct inode *sd_jindex;
 509         struct inode *sd_inum_inode;
 510         struct inode *sd_statfs_inode;
 511         struct inode *sd_ir_inode;
 512         struct inode *sd_sc_inode;
 513         struct inode *sd_qc_inode;
 514         struct inode *sd_rindex;
 515         struct inode *sd_quota_inode;
 516
 517         /* Inum stuff */
 518
 519         struct mutex sd_inum_mutex;
 520
 521         /* StatFS stuff */
 522
 523         spinlock_t sd_statfs_spin;
 524         struct mutex sd_statfs_mutex;
 525         struct gfs2_statfs_change_host sd_statfs_master;
 526         struct gfs2_statfs_change_host sd_statfs_local;
 527         unsigned long sd_statfs_sync_time;
 528
 529         /* Resource group stuff */
 530
 531         u64 sd_rindex_vn;
 532         spinlock_t sd_rindex_spin;
 533         struct mutex sd_rindex_mutex;
 534         struct list_head sd_rindex_list;
 535         struct list_head sd_rindex_mru_list;
 536         struct list_head sd_rindex_recent_list;
 537         struct gfs2_rgrpd *sd_rindex_forward;
 538         unsigned int sd_rgrps;
 539
 540         /* Journal index stuff */
 541
 542         struct list_head sd_jindex_list;
 543         spinlock_t sd_jindex_spin;
 544         struct mutex sd_jindex_mutex;
 545         unsigned int sd_journals;
 546         unsigned long sd_jindex_refresh_time;
 547
 548         struct gfs2_jdesc *sd_jdesc;
 549         struct gfs2_holder sd_journal_gh;
 550         struct gfs2_holder sd_jinode_gh;
 551
 552         struct gfs2_holder sd_ir_gh;
 553         struct gfs2_holder sd_sc_gh;
 554         struct gfs2_holder sd_qc_gh;
 555
 556         /* Daemon stuff */
 557
 558         struct task_struct *sd_recoverd_process;
 559         struct task_struct *sd_logd_process;
 560         struct task_struct *sd_quotad_process;
 561         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 562         unsigned int sd_glockd_num;
 563
 564         /* Quota stuff */
 565
 566         struct list_head sd_quota_list;
 567         atomic_t sd_quota_count;
 568         spinlock_t sd_quota_spin;
 569         struct mutex sd_quota_mutex;
 570
 571         unsigned int sd_quota_slots;
 572         unsigned int sd_quota_chunks;
 573         unsigned char **sd_quota_bitmap;
 574
 575         u64 sd_quota_sync_gen;
 576         unsigned long sd_quota_sync_time;
 577
 578         /* Log stuff */
 579
 580         spinlock_t sd_log_lock;
 581
 582         unsigned int sd_log_blks_reserved;
 583         unsigned int sd_log_commited_buf;
 584         unsigned int sd_log_commited_databuf;
 585         unsigned int sd_log_commited_revoke;
 586
 587         unsigned int sd_log_num_buf;
 588         unsigned int sd_log_num_revoke;
 589         unsigned int sd_log_num_rg;
 590         unsigned int sd_log_num_databuf;
 591
 592         struct list_head sd_log_le_buf;
 593         struct list_head sd_log_le_revoke;
 594         struct list_head sd_log_le_rg;
 595         struct list_head sd_log_le_databuf;
 596         struct list_head sd_log_le_ordered;
 597
 598         atomic_t sd_log_blks_free;
 599         struct mutex sd_log_reserve_mutex;
 600
 601         u64 sd_log_sequence;
 602         unsigned int sd_log_head;
 603         unsigned int sd_log_tail;
 604         int sd_log_idle;
 605
 606         unsigned long sd_log_flush_time;
 607         struct rw_semaphore sd_log_flush_lock;
 608         atomic_t sd_log_in_flight;
 609         wait_queue_head_t sd_log_flush_wait;
 610
 611         unsigned int sd_log_flush_head;
 612         u64 sd_log_flush_wrapped;
 613
 614         struct list_head sd_ail1_list;
 615         struct list_head sd_ail2_list;
 616         u64 sd_ail_sync_gen;
 617
 618         /* Replay stuff */
 619
 620         struct list_head sd_revoke_list;
 621         unsigned int sd_replay_tail;
 622
 623         unsigned int sd_found_blocks;
 624         unsigned int sd_found_revokes;
 625         unsigned int sd_replayed_blocks;
 626
 627         /* For quiescing the filesystem */
 628
 629         struct gfs2_holder sd_freeze_gh;
 630         struct mutex sd_freeze_lock;
 631         unsigned int sd_freeze_count;
 632
 633         /* Counters */
 634
 635         atomic_t sd_glock_count;
 636         atomic_t sd_glock_held_count;
 637         atomic_t sd_inode_count;
 638         atomic_t sd_reclaimed;
 639
 640         char sd_fsname[GFS2_FSNAME_LEN];
 641         char sd_table_name[GFS2_FSNAME_LEN];
 642         char sd_proto_name[GFS2_FSNAME_LEN];
 643
 644         /* Debugging crud */
 645
 646         unsigned long sd_last_warning;
 647         struct vfsmount *sd_gfs2mnt;
 648         struct dentry *debugfs_dir;    /* debugfs directory */
 649         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 650 };
 651
 652 #endif /* __INCORE_DOT_H__ */
 653