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/dlm.h>
  16 #include <linux/buffer_head.h>
  17
  18 #define DIO_WAIT        0x00000010
  19 #define DIO_METADATA    0x00000020
  20 #define DIO_ALL         0x00000100
  21
  22 struct gfs2_log_operations;
  23 struct gfs2_log_element;
  24 struct gfs2_holder;
  25 struct gfs2_glock;
  26 struct gfs2_quota_data;
  27 struct gfs2_trans;
  28 struct gfs2_ail;
  29 struct gfs2_jdesc;
  30 struct gfs2_sbd;
  31 struct lm_lockops;
  32
  33 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  34
  35 struct gfs2_log_header_host {
  36         u64 lh_sequence;        /* Sequence number of this transaction */
  37         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  38         u32 lh_tail;            /* Block number of log tail */
  39         u32 lh_blkno;
  40         u32 lh_hash;
  41 };
  42
  43 /*
  44  * Structure of operations that are associated with each
  45  * type of element in the log.
  46  */
  47
  48 struct gfs2_log_operations {
  49         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  50         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  51         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  52         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  53                                 struct gfs2_log_header_host *head, int pass);
  54         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  55                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  56                                  int pass);
  57         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  58         const char *lo_name;
  59 };
  60
  61 struct gfs2_log_element {
  62         struct list_head le_list;
  63         const struct gfs2_log_operations *le_ops;
  64 };
  65
  66 #define GBF_FULL 1
  67
  68 struct gfs2_bitmap {
  69         struct buffer_head *bi_bh;
  70         char *bi_clone;
  71         unsigned long bi_flags;
  72         u32 bi_offset;
  73         u32 bi_start;
  74         u32 bi_len;
  75 };
  76
  77 struct gfs2_rgrpd {
  78         struct list_head rd_list;       /* Link with superblock */
  79         struct list_head rd_list_mru;
  80         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  81         u64 rd_addr;                    /* grp block disk address */
  82         u64 rd_data0;                   /* first data location */
  83         u32 rd_length;                  /* length of rgrp header in fs blocks */
  84         u32 rd_data;                    /* num of data blocks in rgrp */
  85         u32 rd_bitbytes;                /* number of bytes in data bitmaps */
  86         u32 rd_free;
  87         u32 rd_free_clone;
  88         u32 rd_dinodes;
  89         u64 rd_igeneration;
  90         struct gfs2_bitmap *rd_bits;
  91         struct mutex rd_mutex;
  92         struct gfs2_log_element rd_le;
  93         struct gfs2_sbd *rd_sbd;
  94         unsigned int rd_bh_count;
  95         u32 rd_last_alloc;
  96         u32 rd_flags;
  97 #define GFS2_RDF_CHECK          0x10000000 /* check for unlinked inodes */
  98 #define GFS2_RDF_UPTODATE       0x20000000 /* rg is up to date */
  99 #define GFS2_RDF_ERROR          0x40000000 /* error in rg */
 100 #define GFS2_RDF_MASK           0xf0000000 /* mask for internal flags */
 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 /*
 132  * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
 133  * prefix of lock_dlm_ gets awkward.
 134  */
 135
 136 #define GDLM_STRNAME_BYTES      25
 137 #define GDLM_LVB_SIZE           32
 138
 139 enum {
 140         DFL_BLOCK_LOCKS         = 0,
 141 };
 142
 143 struct lm_lockname {
 144         u64 ln_number;
 145         unsigned int ln_type;
 146 };
 147
 148 #define lm_name_equal(name1, name2) \
 149         (((name1)->ln_number == (name2)->ln_number) && \
 150          ((name1)->ln_type == (name2)->ln_type))
 151
 152
 153 struct gfs2_glock_operations {
 154         void (*go_xmote_th) (struct gfs2_glock *gl);
 155         int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
 156         void (*go_inval) (struct gfs2_glock *gl, int flags);
 157         int (*go_demote_ok) (const struct gfs2_glock *gl);
 158         int (*go_lock) (struct gfs2_holder *gh);
 159         void (*go_unlock) (struct gfs2_holder *gh);
 160         int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
 161         void (*go_callback) (struct gfs2_glock *gl);
 162         const int go_type;
 163         const unsigned long go_min_hold_time;
 164         const unsigned long go_flags;
 165 #define GLOF_ASPACE 1
 166 };
 167
 168 enum {
 169         /* States */
 170         HIF_HOLDER              = 6,  /* Set for gh that "holds" the glock */
 171         HIF_FIRST               = 7,
 172         HIF_WAIT                = 10,
 173 };
 174
 175 struct gfs2_holder {
 176         struct list_head gh_list;
 177
 178         struct gfs2_glock *gh_gl;
 179         struct pid *gh_owner_pid;
 180         unsigned int gh_state;
 181         unsigned gh_flags;
 182
 183         int gh_error;
 184         unsigned long gh_iflags; /* HIF_... */
 185         unsigned long gh_ip;
 186 };
 187
 188 enum {
 189         GLF_LOCK                        = 1,
 190         GLF_DEMOTE                      = 3,
 191         GLF_PENDING_DEMOTE              = 4,
 192         GLF_DEMOTE_IN_PROGRESS          = 5,
 193         GLF_DIRTY                       = 6,
 194         GLF_LFLUSH                      = 7,
 195         GLF_INVALIDATE_IN_PROGRESS      = 8,
 196         GLF_REPLY_PENDING               = 9,
 197         GLF_INITIAL                     = 10,
 198         GLF_FROZEN                      = 11,
 199 };
 200
 201 struct gfs2_glock {
 202         struct hlist_node gl_list;
 203         unsigned long gl_flags;         /* GLF_... */
 204         struct lm_lockname gl_name;
 205         atomic_t gl_ref;
 206
 207         spinlock_t gl_spin;
 208
 209         unsigned int gl_state;
 210         unsigned int gl_target;
 211         unsigned int gl_reply;
 212         unsigned int gl_hash;
 213         unsigned int gl_req;
 214         unsigned int gl_demote_state; /* state requested by remote node */
 215         unsigned long gl_demote_time; /* time of first demote request */
 216         struct list_head gl_holders;
 217
 218         const struct gfs2_glock_operations *gl_ops;
 219         char gl_strname[GDLM_STRNAME_BYTES];
 220         struct dlm_lksb gl_lksb;
 221         char gl_lvb[32];
 222         unsigned long gl_tchange;
 223         void *gl_object;
 224
 225         struct list_head gl_lru;
 226
 227         struct gfs2_sbd *gl_sbd;
 228
 229         struct list_head gl_ail_list;
 230         atomic_t gl_ail_count;
 231         struct delayed_work gl_work;
 232         struct work_struct gl_delete;
 233 };
 234
 235 #define GFS2_MIN_LVB_SIZE 32    /* Min size of LVB that gfs2 supports */
 236
 237 struct gfs2_alloc {
 238         /* Quota stuff */
 239
 240         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 241         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 242         unsigned int al_qd_num;
 243
 244         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 245         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 246
 247         /* Filled in by gfs2_inplace_reserve() */
 248
 249         unsigned int al_line;
 250         char *al_file;
 251         struct gfs2_holder al_ri_gh;
 252         struct gfs2_holder al_rgd_gh;
 253         struct gfs2_rgrpd *al_rgd;
 254
 255 };
 256
 257 enum {
 258         GIF_INVALID             = 0,
 259         GIF_QD_LOCKED           = 1,
 260         GIF_SW_PAGED            = 3,
 261 };
 262
 263
 264 struct gfs2_inode {
 265         struct inode i_inode;
 266         u64 i_no_addr;
 267         u64 i_no_formal_ino;
 268         u64 i_generation;
 269         u64 i_eattr;
 270         loff_t i_disksize;
 271         unsigned long i_flags;          /* GIF_... */
 272         struct gfs2_glock *i_gl; /* Move into i_gh? */
 273         struct gfs2_holder i_iopen_gh;
 274         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 275         struct gfs2_alloc *i_alloc;
 276         u64 i_goal;     /* goal block for allocations */
 277         struct rw_semaphore i_rw_mutex;
 278         struct list_head i_trunc_list;
 279         u32 i_entries;
 280         u32 i_diskflags;
 281         u8 i_height;
 282         u8 i_depth;
 283 };
 284
 285 /*
 286  * Since i_inode is the first element of struct gfs2_inode,
 287  * this is effectively a cast.
 288  */
 289 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 290 {
 291         return container_of(inode, struct gfs2_inode, i_inode);
 292 }
 293
 294 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 295 {
 296         return inode->i_sb->s_fs_info;
 297 }
 298
 299 struct gfs2_file {
 300         struct mutex f_fl_mutex;
 301         struct gfs2_holder f_fl_gh;
 302 };
 303
 304 struct gfs2_revoke_replay {
 305         struct list_head rr_list;
 306         u64 rr_blkno;
 307         unsigned int rr_where;
 308 };
 309
 310 enum {
 311         QDF_USER                = 0,
 312         QDF_CHANGE              = 1,
 313         QDF_LOCKED              = 2,
 314 };
 315
 316 struct gfs2_quota_data {
 317         struct list_head qd_list;
 318         struct list_head qd_reclaim;
 319
 320         atomic_t qd_count;
 321
 322         u32 qd_id;
 323         unsigned long qd_flags;         /* QDF_... */
 324
 325         s64 qd_change;
 326         s64 qd_change_sync;
 327
 328         unsigned int qd_slot;
 329         unsigned int qd_slot_count;
 330
 331         struct buffer_head *qd_bh;
 332         struct gfs2_quota_change *qd_bh_qc;
 333         unsigned int qd_bh_count;
 334
 335         struct gfs2_glock *qd_gl;
 336         struct gfs2_quota_lvb qd_qb;
 337
 338         u64 qd_sync_gen;
 339         unsigned long qd_last_warn;
 340 };
 341
 342 struct gfs2_trans {
 343         unsigned long tr_ip;
 344
 345         unsigned int tr_blocks;
 346         unsigned int tr_revokes;
 347         unsigned int tr_reserved;
 348
 349         struct gfs2_holder tr_t_gh;
 350
 351         int tr_touched;
 352
 353         unsigned int tr_num_buf;
 354         unsigned int tr_num_buf_new;
 355         unsigned int tr_num_databuf_new;
 356         unsigned int tr_num_buf_rm;
 357         unsigned int tr_num_databuf_rm;
 358         struct list_head tr_list_buf;
 359
 360         unsigned int tr_num_revoke;
 361         unsigned int tr_num_revoke_rm;
 362 };
 363
 364 struct gfs2_ail {
 365         struct list_head ai_list;
 366
 367         unsigned int ai_first;
 368         struct list_head ai_ail1_list;
 369         struct list_head ai_ail2_list;
 370
 371         u64 ai_sync_gen;
 372 };
 373
 374 struct gfs2_journal_extent {
 375         struct list_head extent_list;
 376
 377         unsigned int lblock; /* First logical block */
 378         u64 dblock; /* First disk block */
 379         u64 blocks;
 380 };
 381
 382 struct gfs2_jdesc {
 383         struct list_head jd_list;
 384         struct list_head extent_list;
 385         struct work_struct jd_work;
 386         struct inode *jd_inode;
 387         unsigned long jd_flags;
 388 #define JDF_RECOVERY 1
 389         unsigned int jd_jid;
 390         unsigned int jd_blocks;
 391 };
 392
 393 struct gfs2_statfs_change_host {
 394         s64 sc_total;
 395         s64 sc_free;
 396         s64 sc_dinodes;
 397 };
 398
 399 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 400 #define GFS2_QUOTA_OFF          0
 401 #define GFS2_QUOTA_ACCOUNT      1
 402 #define GFS2_QUOTA_ON           2
 403
 404 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 405 #define GFS2_DATA_WRITEBACK     1
 406 #define GFS2_DATA_ORDERED       2
 407
 408 #define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
 409 #define GFS2_ERRORS_WITHDRAW    0
 410 #define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
 411 #define GFS2_ERRORS_RO          2 /* place holder for future feature */
 412 #define GFS2_ERRORS_PANIC       3
 413
 414 struct gfs2_args {
 415         char ar_lockproto[GFS2_LOCKNAME_LEN];   /* Name of the Lock Protocol */
 416         char ar_locktable[GFS2_LOCKNAME_LEN];   /* Name of the Lock Table */
 417         char ar_hostdata[GFS2_LOCKNAME_LEN];    /* Host specific data */
 418         unsigned int ar_spectator:1;            /* Don't get a journal */
 419         unsigned int ar_ignore_local_fs:1;      /* Ignore optimisations */
 420         unsigned int ar_localflocks:1;          /* Let the VFS do flock|fcntl */
 421         unsigned int ar_localcaching:1;         /* Local caching */
 422         unsigned int ar_debug:1;                /* Oops on errors */
 423         unsigned int ar_upgrade:1;              /* Upgrade ondisk format */
 424         unsigned int ar_posix_acl:1;            /* Enable posix acls */
 425         unsigned int ar_quota:2;                /* off/account/on */
 426         unsigned int ar_suiddir:1;              /* suiddir support */
 427         unsigned int ar_data:2;                 /* ordered/writeback */
 428         unsigned int ar_meta:1;                 /* mount metafs */
 429         unsigned int ar_discard:1;              /* discard requests */
 430         unsigned int ar_errors:2;               /* errors=withdraw | panic */
 431         unsigned int ar_nobarrier:1;            /* do not send barriers */
 432         int ar_commit;                          /* Commit interval */
 433         int ar_statfs_quantum;                  /* The fast statfs interval */
 434         int ar_quota_quantum;                   /* The quota interval */
 435         int ar_statfs_percent;                  /* The % change to force sync */
 436 };
 437
 438 struct gfs2_tune {
 439         spinlock_t gt_spin;
 440
 441         unsigned int gt_logd_secs;
 442
 443         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 444         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 445         unsigned int gt_quota_scale_num; /* Numerator */
 446         unsigned int gt_quota_scale_den; /* Denominator */
 447         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 448         unsigned int gt_new_files_jdata;
 449         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 450         unsigned int gt_complain_secs;
 451         unsigned int gt_statfs_quantum;
 452         unsigned int gt_statfs_slow;
 453 };
 454
 455 enum {
 456         SDF_JOURNAL_CHECKED     = 0,
 457         SDF_JOURNAL_LIVE        = 1,
 458         SDF_SHUTDOWN            = 2,
 459         SDF_NOBARRIERS          = 3,
 460         SDF_NORECOVERY          = 4,
 461         SDF_DEMOTE              = 5,
 462         SDF_NOJOURNALID         = 6,
 463 };
 464
 465 #define GFS2_FSNAME_LEN         256
 466
 467 struct gfs2_inum_host {
 468         u64 no_formal_ino;
 469         u64 no_addr;
 470 };
 471
 472 struct gfs2_sb_host {
 473         u32 sb_magic;
 474         u32 sb_type;
 475         u32 sb_format;
 476
 477         u32 sb_fs_format;
 478         u32 sb_multihost_format;
 479         u32 sb_bsize;
 480         u32 sb_bsize_shift;
 481
 482         struct gfs2_inum_host sb_master_dir;
 483         struct gfs2_inum_host sb_root_dir;
 484
 485         char sb_lockproto[GFS2_LOCKNAME_LEN];
 486         char sb_locktable[GFS2_LOCKNAME_LEN];
 487         u8 sb_uuid[16];
 488 };
 489
 490 /*
 491  * lm_mount() return values
 492  *
 493  * ls_jid - the journal ID this node should use
 494  * ls_first - this node is the first to mount the file system
 495  * ls_lockspace - lock module's context for this file system
 496  * ls_ops - lock module's functions
 497  */
 498
 499 struct lm_lockstruct {
 500         unsigned int ls_jid;
 501         unsigned int ls_first;
 502         unsigned int ls_first_done;
 503         unsigned int ls_nodir;
 504         const struct lm_lockops *ls_ops;
 505         unsigned long ls_flags;
 506         dlm_lockspace_t *ls_dlm;
 507
 508         int ls_recover_jid_done;
 509         int ls_recover_jid_status;
 510 };
 511
 512 struct gfs2_sbd {
 513         struct super_block *sd_vfs;
 514         struct kobject sd_kobj;
 515         unsigned long sd_flags; /* SDF_... */
 516         struct gfs2_sb_host sd_sb;
 517
 518         /* Constants computed on mount */
 519
 520         u32 sd_fsb2bb;
 521         u32 sd_fsb2bb_shift;
 522         u32 sd_diptrs;  /* Number of pointers in a dinode */
 523         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 524         u32 sd_jbsize;  /* Size of a journaled data block */
 525         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 526         u32 sd_hash_bsize_shift;
 527         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 528         u32 sd_qc_per_block;
 529         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 530         u32 sd_max_height;      /* Max height of a file's metadata tree */
 531         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 532         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 533         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 534
 535         struct gfs2_args sd_args;       /* Mount arguments */
 536         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 537
 538         /* Lock Stuff */
 539
 540         struct lm_lockstruct sd_lockstruct;
 541         struct gfs2_holder sd_live_gh;
 542         struct gfs2_glock *sd_rename_gl;
 543         struct gfs2_glock *sd_trans_gl;
 544         wait_queue_head_t sd_glock_wait;
 545         atomic_t sd_glock_disposal;
 546
 547         /* Inode Stuff */
 548
 549         struct dentry *sd_master_dir;
 550         struct dentry *sd_root_dir;
 551
 552         struct inode *sd_jindex;
 553         struct inode *sd_statfs_inode;
 554         struct inode *sd_sc_inode;
 555         struct inode *sd_qc_inode;
 556         struct inode *sd_rindex;
 557         struct inode *sd_quota_inode;
 558
 559         /* StatFS stuff */
 560
 561         spinlock_t sd_statfs_spin;
 562         struct gfs2_statfs_change_host sd_statfs_master;
 563         struct gfs2_statfs_change_host sd_statfs_local;
 564         int sd_statfs_force_sync;
 565
 566         /* Resource group stuff */
 567
 568         int sd_rindex_uptodate;
 569         spinlock_t sd_rindex_spin;
 570         struct mutex sd_rindex_mutex;
 571         struct list_head sd_rindex_list;
 572         struct list_head sd_rindex_mru_list;
 573         struct gfs2_rgrpd *sd_rindex_forward;
 574         unsigned int sd_rgrps;
 575
 576         /* Journal index stuff */
 577
 578         struct list_head sd_jindex_list;
 579         spinlock_t sd_jindex_spin;
 580         struct mutex sd_jindex_mutex;
 581         unsigned int sd_journals;
 582
 583         struct gfs2_jdesc *sd_jdesc;
 584         struct gfs2_holder sd_journal_gh;
 585         struct gfs2_holder sd_jinode_gh;
 586
 587         struct gfs2_holder sd_sc_gh;
 588         struct gfs2_holder sd_qc_gh;
 589
 590         /* Daemon stuff */
 591
 592         struct task_struct *sd_logd_process;
 593         struct task_struct *sd_quotad_process;
 594
 595         /* Quota stuff */
 596
 597         struct list_head sd_quota_list;
 598         atomic_t sd_quota_count;
 599         struct mutex sd_quota_mutex;
 600         wait_queue_head_t sd_quota_wait;
 601         struct list_head sd_trunc_list;
 602         spinlock_t sd_trunc_lock;
 603
 604         unsigned int sd_quota_slots;
 605         unsigned int sd_quota_chunks;
 606         unsigned char **sd_quota_bitmap;
 607
 608         u64 sd_quota_sync_gen;
 609
 610         /* Log stuff */
 611
 612         spinlock_t sd_log_lock;
 613
 614         unsigned int sd_log_blks_reserved;
 615         unsigned int sd_log_commited_buf;
 616         unsigned int sd_log_commited_databuf;
 617         int sd_log_commited_revoke;
 618
 619         atomic_t sd_log_pinned;
 620         unsigned int sd_log_num_buf;
 621         unsigned int sd_log_num_revoke;
 622         unsigned int sd_log_num_rg;
 623         unsigned int sd_log_num_databuf;
 624
 625         struct list_head sd_log_le_buf;
 626         struct list_head sd_log_le_revoke;
 627         struct list_head sd_log_le_rg;
 628         struct list_head sd_log_le_databuf;
 629         struct list_head sd_log_le_ordered;
 630
 631         atomic_t sd_log_thresh1;
 632         atomic_t sd_log_thresh2;
 633         atomic_t sd_log_blks_free;
 634         wait_queue_head_t sd_log_waitq;
 635         wait_queue_head_t sd_logd_waitq;
 636
 637         u64 sd_log_sequence;
 638         unsigned int sd_log_head;
 639         unsigned int sd_log_tail;
 640         int sd_log_idle;
 641
 642         struct rw_semaphore sd_log_flush_lock;
 643         atomic_t sd_log_in_flight;
 644         wait_queue_head_t sd_log_flush_wait;
 645
 646         unsigned int sd_log_flush_head;
 647         u64 sd_log_flush_wrapped;
 648
 649         struct list_head sd_ail1_list;
 650         struct list_head sd_ail2_list;
 651         u64 sd_ail_sync_gen;
 652
 653         /* Replay stuff */
 654
 655         struct list_head sd_revoke_list;
 656         unsigned int sd_replay_tail;
 657
 658         unsigned int sd_found_blocks;
 659         unsigned int sd_found_revokes;
 660         unsigned int sd_replayed_blocks;
 661
 662         /* For quiescing the filesystem */
 663
 664         struct gfs2_holder sd_freeze_gh;
 665         struct mutex sd_freeze_lock;
 666         unsigned int sd_freeze_count;
 667
 668         char sd_fsname[GFS2_FSNAME_LEN];
 669         char sd_table_name[GFS2_FSNAME_LEN];
 670         char sd_proto_name[GFS2_FSNAME_LEN];
 671
 672         /* Debugging crud */
 673
 674         unsigned long sd_last_warning;
 675         struct dentry *debugfs_dir;    /* debugfs directory */
 676         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 677 };
 678
 679 #endif /* __INCORE_DOT_H__ */
 680