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 #include <linux/slow-work.h>
  16 #include <linux/dlm.h>
  17 #include <linux/buffer_head.h>
  18
  19 #define DIO_WAIT        0x00000010
  20 #define DIO_METADATA    0x00000020
  21 #define DIO_ALL         0x00000100
  22
  23 struct gfs2_log_operations;
  24 struct gfs2_log_element;
  25 struct gfs2_holder;
  26 struct gfs2_glock;
  27 struct gfs2_quota_data;
  28 struct gfs2_trans;
  29 struct gfs2_ail;
  30 struct gfs2_jdesc;
  31 struct gfs2_sbd;
  32 struct lm_lockops;
  33
  34 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  35
  36 struct gfs2_log_header_host {
  37         u64 lh_sequence;        /* Sequence number of this transaction */
  38         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  39         u32 lh_tail;            /* Block number of log tail */
  40         u32 lh_blkno;
  41         u32 lh_hash;
  42 };
  43
  44 /*
  45  * Structure of operations that are associated with each
  46  * type of element in the log.
  47  */
  48
  49 struct gfs2_log_operations {
  50         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  51         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  52         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  53         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  54                                 struct gfs2_log_header_host *head, int pass);
  55         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  56                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  57                                  int pass);
  58         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  59         const char *lo_name;
  60 };
  61
  62 struct gfs2_log_element {
  63         struct list_head le_list;
  64         const struct gfs2_log_operations *le_ops;
  65 };
  66
  67 #define GBF_FULL 1
  68
  69 struct gfs2_bitmap {
  70         struct buffer_head *bi_bh;
  71         char *bi_clone;
  72         unsigned long bi_flags;
  73         u32 bi_offset;
  74         u32 bi_start;
  75         u32 bi_len;
  76 };
  77
  78 struct gfs2_rgrpd {
  79         struct list_head rd_list;       /* Link with superblock */
  80         struct list_head rd_list_mru;
  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         u32 rd_free;
  88         u32 rd_free_clone;
  89         u32 rd_dinodes;
  90         u64 rd_igeneration;
  91         struct gfs2_bitmap *rd_bits;
  92         struct mutex rd_mutex;
  93         struct gfs2_log_element rd_le;
  94         struct gfs2_sbd *rd_sbd;
  95         unsigned int rd_bh_count;
  96         u32 rd_last_alloc;
  97         u32 rd_flags;
  98 #define GFS2_RDF_CHECK          0x10000000 /* check for unlinked inodes */
  99 #define GFS2_RDF_UPTODATE       0x20000000 /* rg is up to date */
 100 #define GFS2_RDF_ERROR          0x40000000 /* error in rg */
 101 #define GFS2_RDF_MASK           0xf0000000 /* mask for internal flags */
 102 };
 103
 104 enum gfs2_state_bits {
 105         BH_Pinned = BH_PrivateStart,
 106         BH_Escaped = BH_PrivateStart + 1,
 107 };
 108
 109 BUFFER_FNS(Pinned, pinned)
 110 TAS_BUFFER_FNS(Pinned, pinned)
 111 BUFFER_FNS(Escaped, escaped)
 112 TAS_BUFFER_FNS(Escaped, escaped)
 113
 114 struct gfs2_bufdata {
 115         struct buffer_head *bd_bh;
 116         struct gfs2_glock *bd_gl;
 117
 118         union {
 119                 struct list_head list_tr;
 120                 u64 blkno;
 121         } u;
 122 #define bd_list_tr u.list_tr
 123 #define bd_blkno u.blkno
 124
 125         struct gfs2_log_element bd_le;
 126
 127         struct gfs2_ail *bd_ail;
 128         struct list_head bd_ail_st_list;
 129         struct list_head bd_ail_gl_list;
 130 };
 131
 132 /*
 133  * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
 134  * prefix of lock_dlm_ gets awkward.
 135  */
 136
 137 #define GDLM_STRNAME_BYTES      25
 138 #define GDLM_LVB_SIZE           32
 139
 140 enum {
 141         DFL_BLOCK_LOCKS         = 0,
 142 };
 143
 144 struct lm_lockname {
 145         u64 ln_number;
 146         unsigned int ln_type;
 147 };
 148
 149 #define lm_name_equal(name1, name2) \
 150         (((name1)->ln_number == (name2)->ln_number) && \
 151          ((name1)->ln_type == (name2)->ln_type))
 152
 153
 154 struct gfs2_glock_operations {
 155         void (*go_xmote_th) (struct gfs2_glock *gl);
 156         int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
 157         void (*go_inval) (struct gfs2_glock *gl, int flags);
 158         int (*go_demote_ok) (const struct gfs2_glock *gl);
 159         int (*go_lock) (struct gfs2_holder *gh);
 160         void (*go_unlock) (struct gfs2_holder *gh);
 161         int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
 162         const int go_type;
 163         const unsigned long go_min_hold_time;
 164 };
 165
 166 enum {
 167         /* States */
 168         HIF_HOLDER              = 6,  /* Set for gh that "holds" the glock */
 169         HIF_FIRST               = 7,
 170         HIF_WAIT                = 10,
 171 };
 172
 173 struct gfs2_holder {
 174         struct list_head gh_list;
 175
 176         struct gfs2_glock *gh_gl;
 177         struct pid *gh_owner_pid;
 178         unsigned int gh_state;
 179         unsigned gh_flags;
 180
 181         int gh_error;
 182         unsigned long gh_iflags; /* HIF_... */
 183         unsigned long gh_ip;
 184 };
 185
 186 enum {
 187         GLF_LOCK                        = 1,
 188         GLF_DEMOTE                      = 3,
 189         GLF_PENDING_DEMOTE              = 4,
 190         GLF_DEMOTE_IN_PROGRESS          = 5,
 191         GLF_DIRTY                       = 6,
 192         GLF_LFLUSH                      = 7,
 193         GLF_INVALIDATE_IN_PROGRESS      = 8,
 194         GLF_REPLY_PENDING               = 9,
 195         GLF_INITIAL                     = 10,
 196         GLF_FROZEN                      = 11,
 197 };
 198
 199 struct gfs2_glock {
 200         struct hlist_node gl_list;
 201         unsigned long gl_flags;         /* GLF_... */
 202         struct lm_lockname gl_name;
 203         atomic_t gl_ref;
 204
 205         spinlock_t gl_spin;
 206
 207         unsigned int gl_state;
 208         unsigned int gl_target;
 209         unsigned int gl_reply;
 210         unsigned int gl_hash;
 211         unsigned int gl_req;
 212         unsigned int gl_demote_state; /* state requested by remote node */
 213         unsigned long gl_demote_time; /* time of first demote request */
 214         struct list_head gl_holders;
 215
 216         const struct gfs2_glock_operations *gl_ops;
 217         char gl_strname[GDLM_STRNAME_BYTES];
 218         struct dlm_lksb gl_lksb;
 219         char gl_lvb[32];
 220         unsigned long gl_tchange;
 221         void *gl_object;
 222
 223         struct list_head gl_lru;
 224
 225         struct gfs2_sbd *gl_sbd;
 226
 227         struct inode *gl_aspace;
 228         struct list_head gl_ail_list;
 229         atomic_t gl_ail_count;
 230         struct delayed_work gl_work;
 231 };
 232
 233 #define GFS2_MIN_LVB_SIZE 32    /* Min size of LVB that gfs2 supports */
 234
 235 struct gfs2_alloc {
 236         /* Quota stuff */
 237
 238         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 239         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 240         unsigned int al_qd_num;
 241
 242         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 243         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 244
 245         /* Filled in by gfs2_inplace_reserve() */
 246
 247         unsigned int al_line;
 248         char *al_file;
 249         struct gfs2_holder al_ri_gh;
 250         struct gfs2_holder al_rgd_gh;
 251         struct gfs2_rgrpd *al_rgd;
 252
 253 };
 254
 255 enum {
 256         GIF_INVALID             = 0,
 257         GIF_QD_LOCKED           = 1,
 258         GIF_SW_PAGED            = 3,
 259         GIF_USER                = 4, /* user inode, not metadata addr space */
 260 };
 261
 262
 263 struct gfs2_inode {
 264         struct inode i_inode;
 265         u64 i_no_addr;
 266         u64 i_no_formal_ino;
 267         u64 i_generation;
 268         u64 i_eattr;
 269         loff_t i_disksize;
 270         unsigned long i_flags;          /* GIF_... */
 271         struct gfs2_glock *i_gl; /* Move into i_gh? */
 272         struct gfs2_holder i_iopen_gh;
 273         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 274         struct gfs2_alloc *i_alloc;
 275         u64 i_goal;     /* goal block for allocations */
 276         struct rw_semaphore i_rw_mutex;
 277         struct list_head i_trunc_list;
 278         u32 i_entries;
 279         u32 i_diskflags;
 280         u8 i_height;
 281         u8 i_depth;
 282 };
 283
 284 /*
 285  * Since i_inode is the first element of struct gfs2_inode,
 286  * this is effectively a cast.
 287  */
 288 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 289 {
 290         return container_of(inode, struct gfs2_inode, i_inode);
 291 }
 292
 293 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 294 {
 295         return inode->i_sb->s_fs_info;
 296 }
 297
 298 struct gfs2_file {
 299         struct mutex f_fl_mutex;
 300         struct gfs2_holder f_fl_gh;
 301 };
 302
 303 struct gfs2_revoke_replay {
 304         struct list_head rr_list;
 305         u64 rr_blkno;
 306         unsigned int rr_where;
 307 };
 308
 309 enum {
 310         QDF_USER                = 0,
 311         QDF_CHANGE              = 1,
 312         QDF_LOCKED              = 2,
 313 };
 314
 315 struct gfs2_quota_data {
 316         struct list_head qd_list;
 317         struct list_head qd_reclaim;
 318
 319         atomic_t qd_count;
 320
 321         u32 qd_id;
 322         unsigned long qd_flags;         /* QDF_... */
 323
 324         s64 qd_change;
 325         s64 qd_change_sync;
 326
 327         unsigned int qd_slot;
 328         unsigned int qd_slot_count;
 329
 330         struct buffer_head *qd_bh;
 331         struct gfs2_quota_change *qd_bh_qc;
 332         unsigned int qd_bh_count;
 333
 334         struct gfs2_glock *qd_gl;
 335         struct gfs2_quota_lvb qd_qb;
 336
 337         u64 qd_sync_gen;
 338         unsigned long qd_last_warn;
 339 };
 340
 341 struct gfs2_trans {
 342         unsigned long tr_ip;
 343
 344         unsigned int tr_blocks;
 345         unsigned int tr_revokes;
 346         unsigned int tr_reserved;
 347
 348         struct gfs2_holder tr_t_gh;
 349
 350         int tr_touched;
 351
 352         unsigned int tr_num_buf;
 353         unsigned int tr_num_buf_new;
 354         unsigned int tr_num_databuf_new;
 355         unsigned int tr_num_buf_rm;
 356         unsigned int tr_num_databuf_rm;
 357         struct list_head tr_list_buf;
 358
 359         unsigned int tr_num_revoke;
 360         unsigned int tr_num_revoke_rm;
 361 };
 362
 363 struct gfs2_ail {
 364         struct list_head ai_list;
 365
 366         unsigned int ai_first;
 367         struct list_head ai_ail1_list;
 368         struct list_head ai_ail2_list;
 369
 370         u64 ai_sync_gen;
 371 };
 372
 373 struct gfs2_journal_extent {
 374         struct list_head extent_list;
 375
 376         unsigned int lblock; /* First logical block */
 377         u64 dblock; /* First disk block */
 378         u64 blocks;
 379 };
 380
 381 struct gfs2_jdesc {
 382         struct list_head jd_list;
 383         struct list_head extent_list;
 384         struct slow_work jd_work;
 385         struct inode *jd_inode;
 386         unsigned long jd_flags;
 387 #define JDF_RECOVERY 1
 388         unsigned int jd_jid;
 389         unsigned int jd_blocks;
 390 };
 391
 392 struct gfs2_statfs_change_host {
 393         s64 sc_total;
 394         s64 sc_free;
 395         s64 sc_dinodes;
 396 };
 397
 398 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 399 #define GFS2_QUOTA_OFF          0
 400 #define GFS2_QUOTA_ACCOUNT      1
 401 #define GFS2_QUOTA_ON           2
 402
 403 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 404 #define GFS2_DATA_WRITEBACK     1
 405 #define GFS2_DATA_ORDERED       2
 406
 407 struct gfs2_args {
 408         char ar_lockproto[GFS2_LOCKNAME_LEN];   /* Name of the Lock Protocol */
 409         char ar_locktable[GFS2_LOCKNAME_LEN];   /* Name of the Lock Table */
 410         char ar_hostdata[GFS2_LOCKNAME_LEN];    /* Host specific data */
 411         unsigned int ar_spectator:1;            /* Don't get a journal */
 412         unsigned int ar_ignore_local_fs:1;      /* Ignore optimisations */
 413         unsigned int ar_localflocks:1;          /* Let the VFS do flock|fcntl */
 414         unsigned int ar_localcaching:1;         /* Local caching */
 415         unsigned int ar_debug:1;                /* Oops on errors */
 416         unsigned int ar_upgrade:1;              /* Upgrade ondisk format */
 417         unsigned int ar_posix_acl:1;            /* Enable posix acls */
 418         unsigned int ar_quota:2;                /* off/account/on */
 419         unsigned int ar_suiddir:1;              /* suiddir support */
 420         unsigned int ar_data:2;                 /* ordered/writeback */
 421         unsigned int ar_meta:1;                 /* mount metafs */
 422         unsigned int ar_discard:1;              /* discard requests */
 423         int ar_commit;                          /* Commit interval */
 424 };
 425
 426 struct gfs2_tune {
 427         spinlock_t gt_spin;
 428
 429         unsigned int gt_incore_log_blocks;
 430         unsigned int gt_log_flush_secs;
 431
 432         unsigned int gt_logd_secs;
 433
 434         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 435         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 436         unsigned int gt_quota_scale_num; /* Numerator */
 437         unsigned int gt_quota_scale_den; /* Denominator */
 438         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 439         unsigned int gt_new_files_jdata;
 440         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 441         unsigned int gt_stall_secs; /* Detects trouble! */
 442         unsigned int gt_complain_secs;
 443         unsigned int gt_statfs_quantum;
 444         unsigned int gt_statfs_slow;
 445 };
 446
 447 enum {
 448         SDF_JOURNAL_CHECKED     = 0,
 449         SDF_JOURNAL_LIVE        = 1,
 450         SDF_SHUTDOWN            = 2,
 451         SDF_NOBARRIERS          = 3,
 452         SDF_NORECOVERY          = 4,
 453 };
 454
 455 #define GFS2_FSNAME_LEN         256
 456
 457 struct gfs2_inum_host {
 458         u64 no_formal_ino;
 459         u64 no_addr;
 460 };
 461
 462 struct gfs2_sb_host {
 463         u32 sb_magic;
 464         u32 sb_type;
 465         u32 sb_format;
 466
 467         u32 sb_fs_format;
 468         u32 sb_multihost_format;
 469         u32 sb_bsize;
 470         u32 sb_bsize_shift;
 471
 472         struct gfs2_inum_host sb_master_dir;
 473         struct gfs2_inum_host sb_root_dir;
 474
 475         char sb_lockproto[GFS2_LOCKNAME_LEN];
 476         char sb_locktable[GFS2_LOCKNAME_LEN];
 477         u8 sb_uuid[16];
 478 };
 479
 480 /*
 481  * lm_mount() return values
 482  *
 483  * ls_jid - the journal ID this node should use
 484  * ls_first - this node is the first to mount the file system
 485  * ls_lockspace - lock module's context for this file system
 486  * ls_ops - lock module's functions
 487  */
 488
 489 struct lm_lockstruct {
 490         u32 ls_id;
 491         unsigned int ls_jid;
 492         unsigned int ls_first;
 493         unsigned int ls_first_done;
 494         unsigned int ls_nodir;
 495         const struct lm_lockops *ls_ops;
 496         unsigned long ls_flags;
 497         dlm_lockspace_t *ls_dlm;
 498
 499         int ls_recover_jid_done;
 500         int ls_recover_jid_status;
 501 };
 502
 503 struct gfs2_sbd {
 504         struct super_block *sd_vfs;
 505         struct kobject sd_kobj;
 506         unsigned long sd_flags; /* SDF_... */
 507         struct gfs2_sb_host sd_sb;
 508
 509         /* Constants computed on mount */
 510
 511         u32 sd_fsb2bb;
 512         u32 sd_fsb2bb_shift;
 513         u32 sd_diptrs;  /* Number of pointers in a dinode */
 514         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 515         u32 sd_jbsize;  /* Size of a journaled data block */
 516         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 517         u32 sd_hash_bsize_shift;
 518         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 519         u32 sd_qc_per_block;
 520         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 521         u32 sd_max_height;      /* Max height of a file's metadata tree */
 522         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 523         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 524         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 525
 526         struct gfs2_args sd_args;       /* Mount arguments */
 527         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 528
 529         /* Lock Stuff */
 530
 531         struct lm_lockstruct sd_lockstruct;
 532         struct gfs2_holder sd_live_gh;
 533         struct gfs2_glock *sd_rename_gl;
 534         struct gfs2_glock *sd_trans_gl;
 535
 536         /* Inode Stuff */
 537
 538         struct dentry *sd_master_dir;
 539         struct dentry *sd_root_dir;
 540
 541         struct inode *sd_jindex;
 542         struct inode *sd_inum_inode;
 543         struct inode *sd_statfs_inode;
 544         struct inode *sd_ir_inode;
 545         struct inode *sd_sc_inode;
 546         struct inode *sd_qc_inode;
 547         struct inode *sd_rindex;
 548         struct inode *sd_quota_inode;
 549
 550         /* Inum stuff */
 551
 552         struct mutex sd_inum_mutex;
 553
 554         /* StatFS stuff */
 555
 556         spinlock_t sd_statfs_spin;
 557         struct gfs2_statfs_change_host sd_statfs_master;
 558         struct gfs2_statfs_change_host sd_statfs_local;
 559
 560         /* Resource group stuff */
 561
 562         int sd_rindex_uptodate;
 563         spinlock_t sd_rindex_spin;
 564         struct mutex sd_rindex_mutex;
 565         struct list_head sd_rindex_list;
 566         struct list_head sd_rindex_mru_list;
 567         struct gfs2_rgrpd *sd_rindex_forward;
 568         unsigned int sd_rgrps;
 569
 570         /* Journal index stuff */
 571
 572         struct list_head sd_jindex_list;
 573         spinlock_t sd_jindex_spin;
 574         struct mutex sd_jindex_mutex;
 575         unsigned int sd_journals;
 576
 577         struct gfs2_jdesc *sd_jdesc;
 578         struct gfs2_holder sd_journal_gh;
 579         struct gfs2_holder sd_jinode_gh;
 580
 581         struct gfs2_holder sd_ir_gh;
 582         struct gfs2_holder sd_sc_gh;
 583         struct gfs2_holder sd_qc_gh;
 584
 585         /* Daemon stuff */
 586
 587         struct task_struct *sd_logd_process;
 588         struct task_struct *sd_quotad_process;
 589
 590         /* Quota stuff */
 591
 592         struct list_head sd_quota_list;
 593         atomic_t sd_quota_count;
 594         struct mutex sd_quota_mutex;
 595         wait_queue_head_t sd_quota_wait;
 596         struct list_head sd_trunc_list;
 597         spinlock_t sd_trunc_lock;
 598
 599         unsigned int sd_quota_slots;
 600         unsigned int sd_quota_chunks;
 601         unsigned char **sd_quota_bitmap;
 602
 603         u64 sd_quota_sync_gen;
 604
 605         /* Log stuff */
 606
 607         spinlock_t sd_log_lock;
 608
 609         unsigned int sd_log_blks_reserved;
 610         unsigned int sd_log_commited_buf;
 611         unsigned int sd_log_commited_databuf;
 612         unsigned int sd_log_commited_revoke;
 613
 614         unsigned int sd_log_num_buf;
 615         unsigned int sd_log_num_revoke;
 616         unsigned int sd_log_num_rg;
 617         unsigned int sd_log_num_databuf;
 618
 619         struct list_head sd_log_le_buf;
 620         struct list_head sd_log_le_revoke;
 621         struct list_head sd_log_le_rg;
 622         struct list_head sd_log_le_databuf;
 623         struct list_head sd_log_le_ordered;
 624
 625         atomic_t sd_log_blks_free;
 626         struct mutex sd_log_reserve_mutex;
 627
 628         u64 sd_log_sequence;
 629         unsigned int sd_log_head;
 630         unsigned int sd_log_tail;
 631         int sd_log_idle;
 632
 633         unsigned long sd_log_flush_time;
 634         struct rw_semaphore sd_log_flush_lock;
 635         atomic_t sd_log_in_flight;
 636         wait_queue_head_t sd_log_flush_wait;
 637
 638         unsigned int sd_log_flush_head;
 639         u64 sd_log_flush_wrapped;
 640
 641         struct list_head sd_ail1_list;
 642         struct list_head sd_ail2_list;
 643         u64 sd_ail_sync_gen;
 644
 645         /* Replay stuff */
 646
 647         struct list_head sd_revoke_list;
 648         unsigned int sd_replay_tail;
 649
 650         unsigned int sd_found_blocks;
 651         unsigned int sd_found_revokes;
 652         unsigned int sd_replayed_blocks;
 653
 654         /* For quiescing the filesystem */
 655
 656         struct gfs2_holder sd_freeze_gh;
 657         struct mutex sd_freeze_lock;
 658         unsigned int sd_freeze_count;
 659
 660         char sd_fsname[GFS2_FSNAME_LEN];
 661         char sd_table_name[GFS2_FSNAME_LEN];
 662         char sd_proto_name[GFS2_FSNAME_LEN];
 663
 664         /* Debugging crud */
 665
 666         unsigned long sd_last_warning;
 667         struct dentry *debugfs_dir;    /* debugfs directory */
 668         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 669 };
 670
 671 #endif /* __INCORE_DOT_H__ */
 672