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 #include <linux/completion.h>
  21 #include <linux/rbtree.h>
  22
  23 #define DIO_WAIT        0x00000010
  24 #define DIO_METADATA    0x00000020
  25
  26 struct gfs2_log_operations;
  27 struct gfs2_log_element;
  28 struct gfs2_holder;
  29 struct gfs2_glock;
  30 struct gfs2_quota_data;
  31 struct gfs2_trans;
  32 struct gfs2_ail;
  33 struct gfs2_jdesc;
  34 struct gfs2_sbd;
  35 struct lm_lockops;
  36
  37 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  38
  39 struct gfs2_log_header_host {
  40         u64 lh_sequence;        /* Sequence number of this transaction */
  41         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  42         u32 lh_tail;            /* Block number of log tail */
  43         u32 lh_blkno;
  44         u32 lh_hash;
  45 };
  46
  47 /*
  48  * Structure of operations that are associated with each
  49  * type of element in the log.
  50  */
  51
  52 struct gfs2_log_operations {
  53         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  54         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  55         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  56         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  57                                 struct gfs2_log_header_host *head, int pass);
  58         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  59                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  60                                  int pass);
  61         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  62         const char *lo_name;
  63 };
  64
  65 struct gfs2_log_element {
  66         struct list_head le_list;
  67         const struct gfs2_log_operations *le_ops;
  68 };
  69
  70 #define GBF_FULL 1
  71
  72 struct gfs2_bitmap {
  73         struct buffer_head *bi_bh;
  74         char *bi_clone;
  75         unsigned long bi_flags;
  76         u32 bi_offset;
  77         u32 bi_start;
  78         u32 bi_len;
  79 };
  80
  81 struct gfs2_rgrpd {
  82         struct rb_node rd_node;         /* Link with superblock */
  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 gfs2_sbd *rd_sbd;
  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_flags;
 164 #define GLOF_ASPACE 1
 165 };
 166
 167 enum {
 168         /* States */
 169         HIF_HOLDER              = 6,  /* Set for gh that "holds" the glock */
 170         HIF_FIRST               = 7,
 171         HIF_WAIT                = 10,
 172 };
 173
 174 struct gfs2_holder {
 175         struct list_head gh_list;
 176
 177         struct gfs2_glock *gh_gl;
 178         struct pid *gh_owner_pid;
 179         unsigned int gh_state;
 180         unsigned gh_flags;
 181
 182         int gh_error;
 183         unsigned long gh_iflags; /* HIF_... */
 184         unsigned long gh_ip;
 185 };
 186
 187 enum {
 188         GLF_LOCK                        = 1,
 189         GLF_DEMOTE                      = 3,
 190         GLF_PENDING_DEMOTE              = 4,
 191         GLF_DEMOTE_IN_PROGRESS          = 5,
 192         GLF_DIRTY                       = 6,
 193         GLF_LFLUSH                      = 7,
 194         GLF_INVALIDATE_IN_PROGRESS      = 8,
 195         GLF_REPLY_PENDING               = 9,
 196         GLF_INITIAL                     = 10,
 197         GLF_FROZEN                      = 11,
 198         GLF_QUEUED                      = 12,
 199         GLF_LRU                         = 13,
 200         GLF_OBJECT                      = 14, /* Used only for tracing */
 201 };
 202
 203 struct gfs2_glock {
 204         struct hlist_bl_node gl_list;
 205         unsigned long gl_flags;         /* GLF_... */
 206         struct lm_lockname gl_name;
 207         atomic_t gl_ref;
 208
 209         spinlock_t gl_spin;
 210
 211         /* State fields protected by gl_spin */
 212         unsigned int gl_state:2,        /* Current state */
 213                      gl_target:2,       /* Target state */
 214                      gl_demote_state:2, /* State requested by remote node */
 215                      gl_req:2,          /* State in last dlm request */
 216                      gl_reply:8;        /* Last reply from the dlm */
 217
 218         unsigned int gl_hash;
 219         unsigned long gl_demote_time; /* time of first demote request */
 220         long gl_hold_time;
 221         struct list_head gl_holders;
 222
 223         const struct gfs2_glock_operations *gl_ops;
 224         char gl_strname[GDLM_STRNAME_BYTES];
 225         struct dlm_lksb gl_lksb;
 226         char gl_lvb[32];
 227         unsigned long gl_tchange;
 228         void *gl_object;
 229
 230         struct list_head gl_lru;
 231
 232         struct gfs2_sbd *gl_sbd;
 233
 234         struct list_head gl_ail_list;
 235         atomic_t gl_ail_count;
 236         atomic_t gl_revokes;
 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_rgd_gh;
 259         struct gfs2_rgrpd *al_rgd;
 260
 261 };
 262
 263 enum {
 264         GIF_INVALID             = 0,
 265         GIF_QD_LOCKED           = 1,
 266         GIF_ALLOC_FAILED        = 2,
 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         __be64 *i_hash_cache;
 286         u32 i_entries;
 287         u32 i_diskflags;
 288         u8 i_height;
 289         u8 i_depth;
 290 };
 291
 292 /*
 293  * Since i_inode is the first element of struct gfs2_inode,
 294  * this is effectively a cast.
 295  */
 296 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 297 {
 298         return container_of(inode, struct gfs2_inode, i_inode);
 299 }
 300
 301 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 302 {
 303         return inode->i_sb->s_fs_info;
 304 }
 305
 306 struct gfs2_file {
 307         struct mutex f_fl_mutex;
 308         struct gfs2_holder f_fl_gh;
 309 };
 310
 311 struct gfs2_revoke_replay {
 312         struct list_head rr_list;
 313         u64 rr_blkno;
 314         unsigned int rr_where;
 315 };
 316
 317 enum {
 318         QDF_USER                = 0,
 319         QDF_CHANGE              = 1,
 320         QDF_LOCKED              = 2,
 321         QDF_REFRESH             = 3,
 322 };
 323
 324 struct gfs2_quota_data {
 325         struct list_head qd_list;
 326         struct list_head qd_reclaim;
 327
 328         atomic_t qd_count;
 329
 330         u32 qd_id;
 331         unsigned long qd_flags;         /* QDF_... */
 332
 333         s64 qd_change;
 334         s64 qd_change_sync;
 335
 336         unsigned int qd_slot;
 337         unsigned int qd_slot_count;
 338
 339         struct buffer_head *qd_bh;
 340         struct gfs2_quota_change *qd_bh_qc;
 341         unsigned int qd_bh_count;
 342
 343         struct gfs2_glock *qd_gl;
 344         struct gfs2_quota_lvb qd_qb;
 345
 346         u64 qd_sync_gen;
 347         unsigned long qd_last_warn;
 348 };
 349
 350 struct gfs2_trans {
 351         unsigned long tr_ip;
 352
 353         unsigned int tr_blocks;
 354         unsigned int tr_revokes;
 355         unsigned int tr_reserved;
 356
 357         struct gfs2_holder tr_t_gh;
 358
 359         int tr_touched;
 360
 361         unsigned int tr_num_buf;
 362         unsigned int tr_num_buf_new;
 363         unsigned int tr_num_databuf_new;
 364         unsigned int tr_num_buf_rm;
 365         unsigned int tr_num_databuf_rm;
 366         struct list_head tr_list_buf;
 367
 368         unsigned int tr_num_revoke;
 369         unsigned int tr_num_revoke_rm;
 370 };
 371
 372 struct gfs2_ail {
 373         struct list_head ai_list;
 374
 375         unsigned int ai_first;
 376         struct list_head ai_ail1_list;
 377         struct list_head ai_ail2_list;
 378 };
 379
 380 struct gfs2_journal_extent {
 381         struct list_head extent_list;
 382
 383         unsigned int lblock; /* First logical block */
 384         u64 dblock; /* First disk block */
 385         u64 blocks;
 386 };
 387
 388 struct gfs2_jdesc {
 389         struct list_head jd_list;
 390         struct list_head extent_list;
 391         struct work_struct jd_work;
 392         struct inode *jd_inode;
 393         unsigned long jd_flags;
 394 #define JDF_RECOVERY 1
 395         unsigned int jd_jid;
 396         unsigned int jd_blocks;
 397 };
 398
 399 struct gfs2_statfs_change_host {
 400         s64 sc_total;
 401         s64 sc_free;
 402         s64 sc_dinodes;
 403 };
 404
 405 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 406 #define GFS2_QUOTA_OFF          0
 407 #define GFS2_QUOTA_ACCOUNT      1
 408 #define GFS2_QUOTA_ON           2
 409
 410 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 411 #define GFS2_DATA_WRITEBACK     1
 412 #define GFS2_DATA_ORDERED       2
 413
 414 #define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
 415 #define GFS2_ERRORS_WITHDRAW    0
 416 #define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
 417 #define GFS2_ERRORS_RO          2 /* place holder for future feature */
 418 #define GFS2_ERRORS_PANIC       3
 419
 420 struct gfs2_args {
 421         char ar_lockproto[GFS2_LOCKNAME_LEN];   /* Name of the Lock Protocol */
 422         char ar_locktable[GFS2_LOCKNAME_LEN];   /* Name of the Lock Table */
 423         char ar_hostdata[GFS2_LOCKNAME_LEN];    /* Host specific data */
 424         unsigned int ar_spectator:1;            /* Don't get a journal */
 425         unsigned int ar_localflocks:1;          /* Let the VFS do flock|fcntl */
 426         unsigned int ar_debug:1;                /* Oops on errors */
 427         unsigned int ar_posix_acl:1;            /* Enable posix acls */
 428         unsigned int ar_quota:2;                /* off/account/on */
 429         unsigned int ar_suiddir:1;              /* suiddir support */
 430         unsigned int ar_data:2;                 /* ordered/writeback */
 431         unsigned int ar_meta:1;                 /* mount metafs */
 432         unsigned int ar_discard:1;              /* discard requests */
 433         unsigned int ar_errors:2;               /* errors=withdraw | panic */
 434         unsigned int ar_nobarrier:1;            /* do not send barriers */
 435         int ar_commit;                          /* Commit interval */
 436         int ar_statfs_quantum;                  /* The fast statfs interval */
 437         int ar_quota_quantum;                   /* The quota interval */
 438         int ar_statfs_percent;                  /* The % change to force sync */
 439 };
 440
 441 struct gfs2_tune {
 442         spinlock_t gt_spin;
 443
 444         unsigned int gt_logd_secs;
 445
 446         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 447         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 448         unsigned int gt_quota_scale_num; /* Numerator */
 449         unsigned int gt_quota_scale_den; /* Denominator */
 450         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 451         unsigned int gt_new_files_jdata;
 452         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 453         unsigned int gt_complain_secs;
 454         unsigned int gt_statfs_quantum;
 455         unsigned int gt_statfs_slow;
 456 };
 457
 458 enum {
 459         SDF_JOURNAL_CHECKED     = 0,
 460         SDF_JOURNAL_LIVE        = 1,
 461         SDF_SHUTDOWN            = 2,
 462         SDF_NOBARRIERS          = 3,
 463         SDF_NORECOVERY          = 4,
 464         SDF_DEMOTE              = 5,
 465         SDF_NOJOURNALID         = 6,
 466 };
 467
 468 #define GFS2_FSNAME_LEN         256
 469
 470 struct gfs2_inum_host {
 471         u64 no_formal_ino;
 472         u64 no_addr;
 473 };
 474
 475 struct gfs2_sb_host {
 476         u32 sb_magic;
 477         u32 sb_type;
 478         u32 sb_format;
 479
 480         u32 sb_fs_format;
 481         u32 sb_multihost_format;
 482         u32 sb_bsize;
 483         u32 sb_bsize_shift;
 484
 485         struct gfs2_inum_host sb_master_dir;
 486         struct gfs2_inum_host sb_root_dir;
 487
 488         char sb_lockproto[GFS2_LOCKNAME_LEN];
 489         char sb_locktable[GFS2_LOCKNAME_LEN];
 490 };
 491
 492 /*
 493  * lm_mount() return values
 494  *
 495  * ls_jid - the journal ID this node should use
 496  * ls_first - this node is the first to mount the file system
 497  * ls_lockspace - lock module's context for this file system
 498  * ls_ops - lock module's functions
 499  */
 500
 501 struct lm_lockstruct {
 502         int ls_jid;
 503         unsigned int ls_first;
 504         unsigned int ls_first_done;
 505         unsigned int ls_nodir;
 506         const struct lm_lockops *ls_ops;
 507         unsigned long ls_flags;
 508         dlm_lockspace_t *ls_dlm;
 509
 510         int ls_recover_jid_done;
 511         int ls_recover_jid_status;
 512 };
 513
 514 struct gfs2_sbd {
 515         struct super_block *sd_vfs;
 516         struct kobject sd_kobj;
 517         unsigned long sd_flags; /* SDF_... */
 518         struct gfs2_sb_host sd_sb;
 519
 520         /* Constants computed on mount */
 521
 522         u32 sd_fsb2bb;
 523         u32 sd_fsb2bb_shift;
 524         u32 sd_diptrs;  /* Number of pointers in a dinode */
 525         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 526         u32 sd_jbsize;  /* Size of a journaled data block */
 527         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 528         u32 sd_hash_bsize_shift;
 529         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 530         u32 sd_qc_per_block;
 531         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 532         u32 sd_max_height;      /* Max height of a file's metadata tree */
 533         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 534         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 535         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 536
 537         struct gfs2_args sd_args;       /* Mount arguments */
 538         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 539
 540         /* Lock Stuff */
 541
 542         struct lm_lockstruct sd_lockstruct;
 543         struct gfs2_holder sd_live_gh;
 544         struct gfs2_glock *sd_rename_gl;
 545         struct gfs2_glock *sd_trans_gl;
 546         wait_queue_head_t sd_glock_wait;
 547         atomic_t sd_glock_disposal;
 548         struct completion sd_locking_init;
 549
 550         /* Inode Stuff */
 551
 552         struct dentry *sd_master_dir;
 553         struct dentry *sd_root_dir;
 554
 555         struct inode *sd_jindex;
 556         struct inode *sd_statfs_inode;
 557         struct inode *sd_sc_inode;
 558         struct inode *sd_qc_inode;
 559         struct inode *sd_rindex;
 560         struct inode *sd_quota_inode;
 561
 562         /* StatFS stuff */
 563
 564         spinlock_t sd_statfs_spin;
 565         struct gfs2_statfs_change_host sd_statfs_master;
 566         struct gfs2_statfs_change_host sd_statfs_local;
 567         int sd_statfs_force_sync;
 568
 569         /* Resource group stuff */
 570
 571         int sd_rindex_uptodate;
 572         spinlock_t sd_rindex_spin;
 573         struct mutex sd_rindex_mutex;
 574         struct rb_root sd_rindex_tree;
 575         unsigned int sd_rgrps;
 576         unsigned int sd_max_rg_data;
 577
 578         /* Journal index stuff */
 579
 580         struct list_head sd_jindex_list;
 581         spinlock_t sd_jindex_spin;
 582         struct mutex sd_jindex_mutex;
 583         unsigned int sd_journals;
 584
 585         struct gfs2_jdesc *sd_jdesc;
 586         struct gfs2_holder sd_journal_gh;
 587         struct gfs2_holder sd_jinode_gh;
 588
 589         struct gfs2_holder sd_sc_gh;
 590         struct gfs2_holder sd_qc_gh;
 591
 592         /* Daemon stuff */
 593
 594         struct task_struct *sd_logd_process;
 595         struct task_struct *sd_quotad_process;
 596
 597         /* Quota stuff */
 598
 599         struct list_head sd_quota_list;
 600         atomic_t sd_quota_count;
 601         struct mutex sd_quota_mutex;
 602         wait_queue_head_t sd_quota_wait;
 603         struct list_head sd_trunc_list;
 604         spinlock_t sd_trunc_lock;
 605
 606         unsigned int sd_quota_slots;
 607         unsigned int sd_quota_chunks;
 608         unsigned char **sd_quota_bitmap;
 609
 610         u64 sd_quota_sync_gen;
 611
 612         /* Log stuff */
 613
 614         spinlock_t sd_log_lock;
 615
 616         unsigned int sd_log_blks_reserved;
 617         unsigned int sd_log_commited_buf;
 618         unsigned int sd_log_commited_databuf;
 619         int sd_log_commited_revoke;
 620
 621         atomic_t sd_log_pinned;
 622         unsigned int sd_log_num_buf;
 623         unsigned int sd_log_num_revoke;
 624         unsigned int sd_log_num_rg;
 625         unsigned int sd_log_num_databuf;
 626
 627         struct list_head sd_log_le_buf;
 628         struct list_head sd_log_le_revoke;
 629         struct list_head sd_log_le_rg;
 630         struct list_head sd_log_le_databuf;
 631         struct list_head sd_log_le_ordered;
 632
 633         atomic_t sd_log_thresh1;
 634         atomic_t sd_log_thresh2;
 635         atomic_t sd_log_blks_free;
 636         wait_queue_head_t sd_log_waitq;
 637         wait_queue_head_t sd_logd_waitq;
 638
 639         u64 sd_log_sequence;
 640         unsigned int sd_log_head;
 641         unsigned int sd_log_tail;
 642         int sd_log_idle;
 643
 644         struct rw_semaphore sd_log_flush_lock;
 645         atomic_t sd_log_in_flight;
 646         wait_queue_head_t sd_log_flush_wait;
 647
 648         unsigned int sd_log_flush_head;
 649         u64 sd_log_flush_wrapped;
 650
 651         spinlock_t sd_ail_lock;
 652         struct list_head sd_ail1_list;
 653         struct list_head sd_ail2_list;
 654
 655         /* Replay stuff */
 656
 657         struct list_head sd_revoke_list;
 658         unsigned int sd_replay_tail;
 659
 660         unsigned int sd_found_blocks;
 661         unsigned int sd_found_revokes;
 662         unsigned int sd_replayed_blocks;
 663
 664         /* For quiescing the filesystem */
 665
 666         struct gfs2_holder sd_freeze_gh;
 667         struct mutex sd_freeze_lock;
 668         unsigned int sd_freeze_count;
 669
 670         char sd_fsname[GFS2_FSNAME_LEN];
 671         char sd_table_name[GFS2_FSNAME_LEN];
 672         char sd_proto_name[GFS2_FSNAME_LEN];
 673
 674         /* Debugging crud */
 675
 676         unsigned long sd_last_warning;
 677         struct dentry *debugfs_dir;    /* debugfs directory */
 678         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 679 };
 680
 681 #endif /* __INCORE_DOT_H__ */
 682