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/kobject.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/dlm.h>
  17 #include <linux/buffer_head.h>
  18 #include <linux/rcupdate.h>
  19 #include <linux/rculist_bl.h>
  20
  21 #define DIO_WAIT        0x00000010
  22 #define DIO_METADATA    0x00000020
  23 #define DIO_ALL         0x00000100
  24
  25 struct gfs2_log_operations;
  26 struct gfs2_log_element;
  27 struct gfs2_holder;
  28 struct gfs2_glock;
  29 struct gfs2_quota_data;
  30 struct gfs2_trans;
  31 struct gfs2_ail;
  32 struct gfs2_jdesc;
  33 struct gfs2_sbd;
  34 struct lm_lockops;
  35
  36 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  37
  38 struct gfs2_log_header_host {
  39         u64 lh_sequence;        /* Sequence number of this transaction */
  40         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  41         u32 lh_tail;            /* Block number of log tail */
  42         u32 lh_blkno;
  43         u32 lh_hash;
  44 };
  45
  46 /*
  47  * Structure of operations that are associated with each
  48  * type of element in the log.
  49  */
  50
  51 struct gfs2_log_operations {
  52         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  53         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  54         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  55         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  56                                 struct gfs2_log_header_host *head, int pass);
  57         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  58                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  59                                  int pass);
  60         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  61         const char *lo_name;
  62 };
  63
  64 struct gfs2_log_element {
  65         struct list_head le_list;
  66         const struct gfs2_log_operations *le_ops;
  67 };
  68
  69 #define GBF_FULL 1
  70
  71 struct gfs2_bitmap {
  72         struct buffer_head *bi_bh;
  73         char *bi_clone;
  74         unsigned long bi_flags;
  75         u32 bi_offset;
  76         u32 bi_start;
  77         u32 bi_len;
  78 };
  79
  80 struct gfs2_rgrpd {
  81         struct list_head rd_list;       /* Link with superblock */
  82         struct list_head rd_list_mru;
  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         u32 rd_free;
  90         u32 rd_free_clone;
  91         u32 rd_dinodes;
  92         u64 rd_igeneration;
  93         struct gfs2_bitmap *rd_bits;
  94         struct mutex rd_mutex;
  95         struct gfs2_log_element rd_le;
  96         struct gfs2_sbd *rd_sbd;
  97         unsigned int rd_bh_count;
  98         u32 rd_last_alloc;
  99         u32 rd_flags;
 100 #define GFS2_RDF_CHECK          0x10000000 /* check for unlinked inodes */
 101 #define GFS2_RDF_UPTODATE       0x20000000 /* rg is up to date */
 102 #define GFS2_RDF_ERROR          0x40000000 /* error in rg */
 103 #define GFS2_RDF_MASK           0xf0000000 /* mask for internal flags */
 104 };
 105
 106 enum gfs2_state_bits {
 107         BH_Pinned = BH_PrivateStart,
 108         BH_Escaped = BH_PrivateStart + 1,
 109 };
 110
 111 BUFFER_FNS(Pinned, pinned)
 112 TAS_BUFFER_FNS(Pinned, pinned)
 113 BUFFER_FNS(Escaped, escaped)
 114 TAS_BUFFER_FNS(Escaped, escaped)
 115
 116 struct gfs2_bufdata {
 117         struct buffer_head *bd_bh;
 118         struct gfs2_glock *bd_gl;
 119
 120         union {
 121                 struct list_head list_tr;
 122                 u64 blkno;
 123         } u;
 124 #define bd_list_tr u.list_tr
 125 #define bd_blkno u.blkno
 126
 127         struct gfs2_log_element bd_le;
 128
 129         struct gfs2_ail *bd_ail;
 130         struct list_head bd_ail_st_list;
 131         struct list_head bd_ail_gl_list;
 132 };
 133
 134 /*
 135  * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
 136  * prefix of lock_dlm_ gets awkward.
 137  */
 138
 139 #define GDLM_STRNAME_BYTES      25
 140 #define GDLM_LVB_SIZE           32
 141
 142 enum {
 143         DFL_BLOCK_LOCKS         = 0,
 144 };
 145
 146 struct lm_lockname {
 147         u64 ln_number;
 148         unsigned int ln_type;
 149 };
 150
 151 #define lm_name_equal(name1, name2) \
 152         (((name1)->ln_number == (name2)->ln_number) && \
 153          ((name1)->ln_type == (name2)->ln_type))
 154
 155
 156 struct gfs2_glock_operations {
 157         void (*go_xmote_th) (struct gfs2_glock *gl);
 158         int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
 159         void (*go_inval) (struct gfs2_glock *gl, int flags);
 160         int (*go_demote_ok) (const struct gfs2_glock *gl);
 161         int (*go_lock) (struct gfs2_holder *gh);
 162         void (*go_unlock) (struct gfs2_holder *gh);
 163         int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
 164         void (*go_callback) (struct gfs2_glock *gl);
 165         const int go_type;
 166         const unsigned long go_min_hold_time;
 167         const unsigned long go_flags;
 168 #define GLOF_ASPACE 1
 169 };
 170
 171 enum {
 172         /* States */
 173         HIF_HOLDER              = 6,  /* Set for gh that "holds" the glock */
 174         HIF_FIRST               = 7,
 175         HIF_WAIT                = 10,
 176 };
 177
 178 struct gfs2_holder {
 179         struct list_head gh_list;
 180
 181         struct gfs2_glock *gh_gl;
 182         struct pid *gh_owner_pid;
 183         unsigned int gh_state;
 184         unsigned gh_flags;
 185
 186         int gh_error;
 187         unsigned long gh_iflags; /* HIF_... */
 188         unsigned long gh_ip;
 189 };
 190
 191 enum {
 192         GLF_LOCK                        = 1,
 193         GLF_DEMOTE                      = 3,
 194         GLF_PENDING_DEMOTE              = 4,
 195         GLF_DEMOTE_IN_PROGRESS          = 5,
 196         GLF_DIRTY                       = 6,
 197         GLF_LFLUSH                      = 7,
 198         GLF_INVALIDATE_IN_PROGRESS      = 8,
 199         GLF_REPLY_PENDING               = 9,
 200         GLF_INITIAL                     = 10,
 201         GLF_FROZEN                      = 11,
 202         GLF_QUEUED                      = 12,
 203 };
 204
 205 struct gfs2_glock {
 206         struct hlist_bl_node gl_list;
 207         unsigned long gl_flags;         /* GLF_... */
 208         struct lm_lockname gl_name;
 209         atomic_t gl_ref;
 210
 211         spinlock_t gl_spin;
 212
 213         /* State fields protected by gl_spin */
 214         unsigned int gl_state:2,        /* Current state */
 215                      gl_target:2,       /* Target state */
 216                      gl_demote_state:2, /* State requested by remote node */
 217                      gl_req:2,          /* State in last dlm request */
 218                      gl_reply:8;        /* Last reply from the dlm */
 219
 220         unsigned int gl_hash;
 221         unsigned long gl_demote_time; /* time of first demote request */
 222         struct list_head gl_holders;
 223
 224         const struct gfs2_glock_operations *gl_ops;
 225         char gl_strname[GDLM_STRNAME_BYTES];
 226         struct dlm_lksb gl_lksb;
 227         char gl_lvb[32];
 228         unsigned long gl_tchange;
 229         void *gl_object;
 230
 231         struct list_head gl_lru;
 232
 233         struct gfs2_sbd *gl_sbd;
 234
 235         struct list_head gl_ail_list;
 236         atomic_t gl_ail_count;
 237         struct delayed_work gl_work;
 238         struct work_struct gl_delete;
 239         struct rcu_head gl_rcu;
 240 };
 241
 242 #define GFS2_MIN_LVB_SIZE 32    /* Min size of LVB that gfs2 supports */
 243
 244 struct gfs2_alloc {
 245         /* Quota stuff */
 246
 247         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 248         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 249         unsigned int al_qd_num;
 250
 251         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 252         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 253
 254         /* Filled in by gfs2_inplace_reserve() */
 255
 256         unsigned int al_line;
 257         char *al_file;
 258         struct gfs2_holder al_ri_gh;
 259         struct gfs2_holder al_rgd_gh;
 260         struct gfs2_rgrpd *al_rgd;
 261
 262 };
 263
 264 enum {
 265         GIF_INVALID             = 0,
 266         GIF_QD_LOCKED           = 1,
 267         GIF_SW_PAGED            = 3,
 268 };
 269
 270
 271 struct gfs2_inode {
 272         struct inode i_inode;
 273         u64 i_no_addr;
 274         u64 i_no_formal_ino;
 275         u64 i_generation;
 276         u64 i_eattr;
 277         unsigned long i_flags;          /* GIF_... */
 278         struct gfs2_glock *i_gl; /* Move into i_gh? */
 279         struct gfs2_holder i_iopen_gh;
 280         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 281         struct gfs2_alloc *i_alloc;
 282         u64 i_goal;     /* goal block for allocations */
 283         struct rw_semaphore i_rw_mutex;
 284         struct list_head i_trunc_list;
 285         u32 i_entries;
 286         u32 i_diskflags;
 287         u8 i_height;
 288         u8 i_depth;
 289 };
 290
 291 /*
 292  * Since i_inode is the first element of struct gfs2_inode,
 293  * this is effectively a cast.
 294  */
 295 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 296 {
 297         return container_of(inode, struct gfs2_inode, i_inode);
 298 }
 299
 300 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 301 {
 302         return inode->i_sb->s_fs_info;
 303 }
 304
 305 struct gfs2_file {
 306         struct mutex f_fl_mutex;
 307         struct gfs2_holder f_fl_gh;
 308 };
 309
 310 struct gfs2_revoke_replay {
 311         struct list_head rr_list;
 312         u64 rr_blkno;
 313         unsigned int rr_where;
 314 };
 315
 316 enum {
 317         QDF_USER                = 0,
 318         QDF_CHANGE              = 1,
 319         QDF_LOCKED              = 2,
 320         QDF_REFRESH             = 3,
 321 };
 322
 323 struct gfs2_quota_data {
 324         struct list_head qd_list;
 325         struct list_head qd_reclaim;
 326
 327         atomic_t qd_count;
 328
 329         u32 qd_id;
 330         unsigned long qd_flags;         /* QDF_... */
 331
 332         s64 qd_change;
 333         s64 qd_change_sync;
 334
 335         unsigned int qd_slot;
 336         unsigned int qd_slot_count;
 337
 338         struct buffer_head *qd_bh;
 339         struct gfs2_quota_change *qd_bh_qc;
 340         unsigned int qd_bh_count;
 341
 342         struct gfs2_glock *qd_gl;
 343         struct gfs2_quota_lvb qd_qb;
 344
 345         u64 qd_sync_gen;
 346         unsigned long qd_last_warn;
 347 };
 348
 349 struct gfs2_trans {
 350         unsigned long tr_ip;
 351
 352         unsigned int tr_blocks;
 353         unsigned int tr_revokes;
 354         unsigned int tr_reserved;
 355
 356         struct gfs2_holder tr_t_gh;
 357
 358         int tr_touched;
 359
 360         unsigned int tr_num_buf;
 361         unsigned int tr_num_buf_new;
 362         unsigned int tr_num_databuf_new;
 363         unsigned int tr_num_buf_rm;
 364         unsigned int tr_num_databuf_rm;
 365         struct list_head tr_list_buf;
 366
 367         unsigned int tr_num_revoke;
 368         unsigned int tr_num_revoke_rm;
 369 };
 370
 371 struct gfs2_ail {
 372         struct list_head ai_list;
 373
 374         unsigned int ai_first;
 375         struct list_head ai_ail1_list;
 376         struct list_head ai_ail2_list;
 377
 378         u64 ai_sync_gen;
 379 };
 380
 381 struct gfs2_journal_extent {
 382         struct list_head extent_list;
 383
 384         unsigned int lblock; /* First logical block */
 385         u64 dblock; /* First disk block */
 386         u64 blocks;
 387 };
 388
 389 struct gfs2_jdesc {
 390         struct list_head jd_list;
 391         struct list_head extent_list;
 392         struct work_struct jd_work;
 393         struct inode *jd_inode;
 394         unsigned long jd_flags;
 395 #define JDF_RECOVERY 1
 396         unsigned int jd_jid;
 397         unsigned int jd_blocks;
 398 };
 399
 400 struct gfs2_statfs_change_host {
 401         s64 sc_total;
 402         s64 sc_free;
 403         s64 sc_dinodes;
 404 };
 405
 406 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 407 #define GFS2_QUOTA_OFF          0
 408 #define GFS2_QUOTA_ACCOUNT      1
 409 #define GFS2_QUOTA_ON           2
 410
 411 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 412 #define GFS2_DATA_WRITEBACK     1
 413 #define GFS2_DATA_ORDERED       2
 414
 415 #define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
 416 #define GFS2_ERRORS_WITHDRAW    0
 417 #define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
 418 #define GFS2_ERRORS_RO          2 /* place holder for future feature */
 419 #define GFS2_ERRORS_PANIC       3
 420
 421 struct gfs2_args {
 422         char ar_lockproto[GFS2_LOCKNAME_LEN];   /* Name of the Lock Protocol */
 423         char ar_locktable[GFS2_LOCKNAME_LEN];   /* Name of the Lock Table */
 424         char ar_hostdata[GFS2_LOCKNAME_LEN];    /* Host specific data */
 425         unsigned int ar_spectator:1;            /* Don't get a journal */
 426         unsigned int ar_localflocks:1;          /* Let the VFS do flock|fcntl */
 427         unsigned int ar_debug:1;                /* Oops on errors */
 428         unsigned int ar_posix_acl:1;            /* Enable posix acls */
 429         unsigned int ar_quota:2;                /* off/account/on */
 430         unsigned int ar_suiddir:1;              /* suiddir support */
 431         unsigned int ar_data:2;                 /* ordered/writeback */
 432         unsigned int ar_meta:1;                 /* mount metafs */
 433         unsigned int ar_discard:1;              /* discard requests */
 434         unsigned int ar_errors:2;               /* errors=withdraw | panic */
 435         unsigned int ar_nobarrier:1;            /* do not send barriers */
 436         int ar_commit;                          /* Commit interval */
 437         int ar_statfs_quantum;                  /* The fast statfs interval */
 438         int ar_quota_quantum;                   /* The quota interval */
 439         int ar_statfs_percent;                  /* The % change to force sync */
 440 };
 441
 442 struct gfs2_tune {
 443         spinlock_t gt_spin;
 444
 445         unsigned int gt_logd_secs;
 446
 447         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 448         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 449         unsigned int gt_quota_scale_num; /* Numerator */
 450         unsigned int gt_quota_scale_den; /* Denominator */
 451         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 452         unsigned int gt_new_files_jdata;
 453         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 454         unsigned int gt_complain_secs;
 455         unsigned int gt_statfs_quantum;
 456         unsigned int gt_statfs_slow;
 457 };
 458
 459 enum {
 460         SDF_JOURNAL_CHECKED     = 0,
 461         SDF_JOURNAL_LIVE        = 1,
 462         SDF_SHUTDOWN            = 2,
 463         SDF_NOBARRIERS          = 3,
 464         SDF_NORECOVERY          = 4,
 465         SDF_DEMOTE              = 5,
 466         SDF_NOJOURNALID         = 6,
 467 };
 468
 469 #define GFS2_FSNAME_LEN         256
 470
 471 struct gfs2_inum_host {
 472         u64 no_formal_ino;
 473         u64 no_addr;
 474 };
 475
 476 struct gfs2_sb_host {
 477         u32 sb_magic;
 478         u32 sb_type;
 479         u32 sb_format;
 480
 481         u32 sb_fs_format;
 482         u32 sb_multihost_format;
 483         u32 sb_bsize;
 484         u32 sb_bsize_shift;
 485
 486         struct gfs2_inum_host sb_master_dir;
 487         struct gfs2_inum_host sb_root_dir;
 488
 489         char sb_lockproto[GFS2_LOCKNAME_LEN];
 490         char sb_locktable[GFS2_LOCKNAME_LEN];
 491         u8 sb_uuid[16];
 492 };
 493
 494 /*
 495  * lm_mount() return values
 496  *
 497  * ls_jid - the journal ID this node should use
 498  * ls_first - this node is the first to mount the file system
 499  * ls_lockspace - lock module's context for this file system
 500  * ls_ops - lock module's functions
 501  */
 502
 503 struct lm_lockstruct {
 504         int ls_jid;
 505         unsigned int ls_first;
 506         unsigned int ls_first_done;
 507         unsigned int ls_nodir;
 508         const struct lm_lockops *ls_ops;
 509         unsigned long ls_flags;
 510         dlm_lockspace_t *ls_dlm;
 511
 512         int ls_recover_jid_done;
 513         int ls_recover_jid_status;
 514 };
 515
 516 struct gfs2_sbd {
 517         struct super_block *sd_vfs;
 518         struct kobject sd_kobj;
 519         unsigned long sd_flags; /* SDF_... */
 520         struct gfs2_sb_host sd_sb;
 521
 522         /* Constants computed on mount */
 523
 524         u32 sd_fsb2bb;
 525         u32 sd_fsb2bb_shift;
 526         u32 sd_diptrs;  /* Number of pointers in a dinode */
 527         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 528         u32 sd_jbsize;  /* Size of a journaled data block */
 529         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 530         u32 sd_hash_bsize_shift;
 531         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 532         u32 sd_qc_per_block;
 533         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 534         u32 sd_max_height;      /* Max height of a file's metadata tree */
 535         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 536         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 537         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 538
 539         struct gfs2_args sd_args;       /* Mount arguments */
 540         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 541
 542         /* Lock Stuff */
 543
 544         struct lm_lockstruct sd_lockstruct;
 545         struct gfs2_holder sd_live_gh;
 546         struct gfs2_glock *sd_rename_gl;
 547         struct gfs2_glock *sd_trans_gl;
 548         wait_queue_head_t sd_glock_wait;
 549         atomic_t sd_glock_disposal;
 550
 551         /* Inode Stuff */
 552
 553         struct dentry *sd_master_dir;
 554         struct dentry *sd_root_dir;
 555
 556         struct inode *sd_jindex;
 557         struct inode *sd_statfs_inode;
 558         struct inode *sd_sc_inode;
 559         struct inode *sd_qc_inode;
 560         struct inode *sd_rindex;
 561         struct inode *sd_quota_inode;
 562
 563         /* StatFS stuff */
 564
 565         spinlock_t sd_statfs_spin;
 566         struct gfs2_statfs_change_host sd_statfs_master;
 567         struct gfs2_statfs_change_host sd_statfs_local;
 568         int sd_statfs_force_sync;
 569
 570         /* Resource group stuff */
 571
 572         int sd_rindex_uptodate;
 573         spinlock_t sd_rindex_spin;
 574         struct mutex sd_rindex_mutex;
 575         struct list_head sd_rindex_list;
 576         struct list_head sd_rindex_mru_list;
 577         struct gfs2_rgrpd *sd_rindex_forward;
 578         unsigned int sd_rgrps;
 579         unsigned int sd_max_rg_data;
 580
 581         /* Journal index stuff */
 582
 583         struct list_head sd_jindex_list;
 584         spinlock_t sd_jindex_spin;
 585         struct mutex sd_jindex_mutex;
 586         unsigned int sd_journals;
 587
 588         struct gfs2_jdesc *sd_jdesc;
 589         struct gfs2_holder sd_journal_gh;
 590         struct gfs2_holder sd_jinode_gh;
 591
 592         struct gfs2_holder sd_sc_gh;
 593         struct gfs2_holder sd_qc_gh;
 594
 595         /* Daemon stuff */
 596
 597         struct task_struct *sd_logd_process;
 598         struct task_struct *sd_quotad_process;
 599
 600         /* Quota stuff */
 601
 602         struct list_head sd_quota_list;
 603         atomic_t sd_quota_count;
 604         struct mutex sd_quota_mutex;
 605         wait_queue_head_t sd_quota_wait;
 606         struct list_head sd_trunc_list;
 607         spinlock_t sd_trunc_lock;
 608
 609         unsigned int sd_quota_slots;
 610         unsigned int sd_quota_chunks;
 611         unsigned char **sd_quota_bitmap;
 612
 613         u64 sd_quota_sync_gen;
 614
 615         /* Log stuff */
 616
 617         spinlock_t sd_log_lock;
 618
 619         unsigned int sd_log_blks_reserved;
 620         unsigned int sd_log_commited_buf;
 621         unsigned int sd_log_commited_databuf;
 622         int sd_log_commited_revoke;
 623
 624         atomic_t sd_log_pinned;
 625         unsigned int sd_log_num_buf;
 626         unsigned int sd_log_num_revoke;
 627         unsigned int sd_log_num_rg;
 628         unsigned int sd_log_num_databuf;
 629
 630         struct list_head sd_log_le_buf;
 631         struct list_head sd_log_le_revoke;
 632         struct list_head sd_log_le_rg;
 633         struct list_head sd_log_le_databuf;
 634         struct list_head sd_log_le_ordered;
 635
 636         atomic_t sd_log_thresh1;
 637         atomic_t sd_log_thresh2;
 638         atomic_t sd_log_blks_free;
 639         wait_queue_head_t sd_log_waitq;
 640         wait_queue_head_t sd_logd_waitq;
 641
 642         u64 sd_log_sequence;
 643         unsigned int sd_log_head;
 644         unsigned int sd_log_tail;
 645         int sd_log_idle;
 646
 647         struct rw_semaphore sd_log_flush_lock;
 648         atomic_t sd_log_in_flight;
 649         wait_queue_head_t sd_log_flush_wait;
 650
 651         unsigned int sd_log_flush_head;
 652         u64 sd_log_flush_wrapped;
 653
 654         spinlock_t sd_ail_lock;
 655         struct list_head sd_ail1_list;
 656         struct list_head sd_ail2_list;
 657         u64 sd_ail_sync_gen;
 658
 659         /* Replay stuff */
 660
 661         struct list_head sd_revoke_list;
 662         unsigned int sd_replay_tail;
 663
 664         unsigned int sd_found_blocks;
 665         unsigned int sd_found_revokes;
 666         unsigned int sd_replayed_blocks;
 667
 668         /* For quiescing the filesystem */
 669
 670         struct gfs2_holder sd_freeze_gh;
 671         struct mutex sd_freeze_lock;
 672         unsigned int sd_freeze_count;
 673
 674         char sd_fsname[GFS2_FSNAME_LEN];
 675         char sd_table_name[GFS2_FSNAME_LEN];
 676         char sd_proto_name[GFS2_FSNAME_LEN];
 677
 678         /* Debugging crud */
 679
 680         unsigned long sd_last_warning;
 681         struct dentry *debugfs_dir;    /* debugfs directory */
 682         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 683 };
 684
 685 #endif /* __INCORE_DOT_H__ */
 686