fs/gfs2/incore.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #ifndef __INCORE_DOT_H__
  11 #define __INCORE_DOT_H__
  12
  13 #include <linux/fs.h>
  14
  15 #define DIO_FORCE       0x00000001
  16 #define DIO_CLEAN       0x00000002
  17 #define DIO_DIRTY       0x00000004
  18 #define DIO_START       0x00000008
  19 #define DIO_WAIT        0x00000010
  20 #define DIO_METADATA    0x00000020
  21 #define DIO_DATA        0x00000040
  22 #define DIO_RELEASE     0x00000080
  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
  35 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  36
  37 /*
  38  * Structure of operations that are associated with each
  39  * type of element in the log.
  40  */
  41
  42 struct gfs2_log_operations {
  43         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  44         void (*lo_incore_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  45         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  46         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  47         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  48                                 struct gfs2_log_header *head, int pass);
  49         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  50                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  51                                  int pass);
  52         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  53         const char *lo_name;
  54 };
  55
  56 struct gfs2_log_element {
  57         struct list_head le_list;
  58         const struct gfs2_log_operations *le_ops;
  59 };
  60
  61 struct gfs2_bitmap {
  62         struct buffer_head *bi_bh;
  63         char *bi_clone;
  64         u32 bi_offset;
  65         u32 bi_start;
  66         u32 bi_len;
  67 };
  68
  69 struct gfs2_rgrpd {
  70         struct list_head rd_list;       /* Link with superblock */
  71         struct list_head rd_list_mru;
  72         struct list_head rd_recent;     /* Recently used rgrps */
  73         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  74         struct gfs2_rindex rd_ri;
  75         struct gfs2_rgrp rd_rg;
  76         u64 rd_rg_vn;
  77         struct gfs2_bitmap *rd_bits;
  78         unsigned int rd_bh_count;
  79         struct mutex rd_mutex;
  80         u32 rd_free_clone;
  81         struct gfs2_log_element rd_le;
  82         u32 rd_last_alloc_data;
  83         u32 rd_last_alloc_meta;
  84         struct gfs2_sbd *rd_sbd;
  85 };
  86
  87 enum gfs2_state_bits {
  88         BH_Pinned = BH_PrivateStart,
  89         BH_Escaped = BH_PrivateStart + 1,
  90 };
  91
  92 BUFFER_FNS(Pinned, pinned)
  93 TAS_BUFFER_FNS(Pinned, pinned)
  94 BUFFER_FNS(Escaped, escaped)
  95 TAS_BUFFER_FNS(Escaped, escaped)
  96
  97 struct gfs2_bufdata {
  98         struct buffer_head *bd_bh;
  99         struct gfs2_glock *bd_gl;
 100
 101         struct list_head bd_list_tr;
 102         struct gfs2_log_element bd_le;
 103
 104         struct gfs2_ail *bd_ail;
 105         struct list_head bd_ail_st_list;
 106         struct list_head bd_ail_gl_list;
 107 };
 108
 109 struct gfs2_glock_operations {
 110         void (*go_xmote_th) (struct gfs2_glock * gl, unsigned int state,
 111                              int flags);
 112         void (*go_xmote_bh) (struct gfs2_glock * gl);
 113         void (*go_drop_th) (struct gfs2_glock * gl);
 114         void (*go_drop_bh) (struct gfs2_glock * gl);
 115         void (*go_sync) (struct gfs2_glock * gl, int flags);
 116         void (*go_inval) (struct gfs2_glock * gl, int flags);
 117         int (*go_demote_ok) (struct gfs2_glock * gl);
 118         int (*go_lock) (struct gfs2_holder * gh);
 119         void (*go_unlock) (struct gfs2_holder * gh);
 120         void (*go_callback) (struct gfs2_glock * gl, unsigned int state);
 121         void (*go_greedy) (struct gfs2_glock * gl);
 122         const int go_type;
 123 };
 124
 125 enum {
 126         /* Actions */
 127         HIF_MUTEX               = 0,
 128         HIF_PROMOTE             = 1,
 129         HIF_DEMOTE              = 2,
 130         HIF_GREEDY              = 3,
 131
 132         /* States */
 133         HIF_ALLOCED             = 4,
 134         HIF_DEALLOC             = 5,
 135         HIF_HOLDER              = 6,
 136         HIF_FIRST               = 7,
 137         HIF_ABORTED             = 9,
 138 };
 139
 140 struct gfs2_holder {
 141         struct list_head gh_list;
 142
 143         struct gfs2_glock *gh_gl;
 144         struct task_struct *gh_owner;
 145         unsigned int gh_state;
 146         unsigned gh_flags;
 147
 148         int gh_error;
 149         unsigned long gh_iflags;
 150         struct completion gh_wait;
 151         unsigned long gh_ip;
 152 };
 153
 154 enum {
 155         GLF_PLUG                = 0,
 156         GLF_LOCK                = 1,
 157         GLF_STICKY              = 2,
 158         GLF_PREFETCH            = 3,
 159         GLF_DIRTY               = 5,
 160         GLF_SKIP_WAITERS2       = 6,
 161         GLF_GREEDY              = 7,
 162 };
 163
 164 struct gfs2_glock {
 165         struct list_head gl_list;
 166         unsigned long gl_flags;         /* GLF_... */
 167         struct lm_lockname gl_name;
 168         struct kref gl_ref;
 169
 170         spinlock_t gl_spin;
 171
 172         unsigned int gl_state;
 173         unsigned int gl_hash;
 174         struct task_struct *gl_owner;
 175         unsigned long gl_ip;
 176         struct list_head gl_holders;
 177         struct list_head gl_waiters1;   /* HIF_MUTEX */
 178         struct list_head gl_waiters2;   /* HIF_DEMOTE, HIF_GREEDY */
 179         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 180
 181         const struct gfs2_glock_operations *gl_ops;
 182
 183         struct gfs2_holder *gl_req_gh;
 184         gfs2_glop_bh_t gl_req_bh;
 185
 186         void *gl_lock;
 187         char *gl_lvb;
 188         atomic_t gl_lvb_count;
 189
 190         u64 gl_vn;
 191         unsigned long gl_stamp;
 192         void *gl_object;
 193
 194         struct list_head gl_reclaim;
 195
 196         struct gfs2_sbd *gl_sbd;
 197
 198         struct inode *gl_aspace;
 199         struct gfs2_log_element gl_le;
 200         struct list_head gl_ail_list;
 201         atomic_t gl_ail_count;
 202 };
 203
 204 struct gfs2_alloc {
 205         /* Quota stuff */
 206
 207         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 208         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 209         unsigned int al_qd_num;
 210
 211         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 212         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 213
 214         /* Filled in by gfs2_inplace_reserve() */
 215
 216         unsigned int al_line;
 217         char *al_file;
 218         struct gfs2_holder al_ri_gh;
 219         struct gfs2_holder al_rgd_gh;
 220         struct gfs2_rgrpd *al_rgd;
 221
 222 };
 223
 224 enum {
 225         GIF_QD_LOCKED           = 1,
 226         GIF_PAGED               = 2,
 227         GIF_SW_PAGED            = 3,
 228 };
 229
 230 struct gfs2_inode {
 231         struct inode i_inode;
 232         struct gfs2_inum i_num;
 233
 234         unsigned long i_flags;          /* GIF_... */
 235
 236         u64 i_vn;
 237         struct gfs2_dinode i_di; /* To be replaced by ref to block */
 238
 239         struct gfs2_glock *i_gl; /* Move into i_gh? */
 240         struct gfs2_holder i_iopen_gh;
 241         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 242         struct gfs2_alloc i_alloc;
 243         u64 i_last_rg_alloc;
 244
 245         spinlock_t i_spin;
 246         struct rw_semaphore i_rw_mutex;
 247         unsigned int i_greedy;
 248         unsigned long i_last_pfault;
 249
 250         struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 251 };
 252
 253 /*
 254  * Since i_inode is the first element of struct gfs2_inode,
 255  * this is effectively a cast.
 256  */
 257 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 258 {
 259         return container_of(inode, struct gfs2_inode, i_inode);
 260 }
 261
 262 /* To be removed? */
 263 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 264 {
 265         return inode->i_sb->s_fs_info;
 266 }
 267
 268 enum {
 269         GFF_DID_DIRECT_ALLOC    = 0,
 270         GFF_EXLOCK = 1,
 271 };
 272
 273 struct gfs2_file {
 274         unsigned long f_flags;          /* GFF_... */
 275         struct mutex f_fl_mutex;
 276         struct gfs2_holder f_fl_gh;
 277 };
 278
 279 struct gfs2_revoke {
 280         struct gfs2_log_element rv_le;
 281         u64 rv_blkno;
 282 };
 283
 284 struct gfs2_revoke_replay {
 285         struct list_head rr_list;
 286         u64 rr_blkno;
 287         unsigned int rr_where;
 288 };
 289
 290 enum {
 291         QDF_USER                = 0,
 292         QDF_CHANGE              = 1,
 293         QDF_LOCKED              = 2,
 294 };
 295
 296 struct gfs2_quota_lvb {
 297         __be32 qb_magic;
 298         u32 __pad;
 299         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 300         __be64 qb_warn;       /* Warn user when alloc is above this # */
 301         __be64 qb_value;       /* Current # blocks allocated */
 302 };
 303
 304 struct gfs2_quota_data {
 305         struct list_head qd_list;
 306         unsigned int qd_count;
 307
 308         u32 qd_id;
 309         unsigned long qd_flags;         /* QDF_... */
 310
 311         s64 qd_change;
 312         s64 qd_change_sync;
 313
 314         unsigned int qd_slot;
 315         unsigned int qd_slot_count;
 316
 317         struct buffer_head *qd_bh;
 318         struct gfs2_quota_change *qd_bh_qc;
 319         unsigned int qd_bh_count;
 320
 321         struct gfs2_glock *qd_gl;
 322         struct gfs2_quota_lvb qd_qb;
 323
 324         u64 qd_sync_gen;
 325         unsigned long qd_last_warn;
 326         unsigned long qd_last_touched;
 327 };
 328
 329 struct gfs2_log_buf {
 330         struct list_head lb_list;
 331         struct buffer_head *lb_bh;
 332         struct buffer_head *lb_real;
 333 };
 334
 335 struct gfs2_trans {
 336         unsigned long tr_ip;
 337
 338         unsigned int tr_blocks;
 339         unsigned int tr_revokes;
 340         unsigned int tr_reserved;
 341
 342         struct gfs2_holder tr_t_gh;
 343
 344         int tr_touched;
 345
 346         unsigned int tr_num_buf;
 347         unsigned int tr_num_buf_new;
 348         unsigned int tr_num_buf_rm;
 349         struct list_head tr_list_buf;
 350
 351         unsigned int tr_num_revoke;
 352         unsigned int tr_num_revoke_rm;
 353 };
 354
 355 struct gfs2_ail {
 356         struct list_head ai_list;
 357
 358         unsigned int ai_first;
 359         struct list_head ai_ail1_list;
 360         struct list_head ai_ail2_list;
 361
 362         u64 ai_sync_gen;
 363 };
 364
 365 struct gfs2_jdesc {
 366         struct list_head jd_list;
 367
 368         struct inode *jd_inode;
 369         unsigned int jd_jid;
 370         int jd_dirty;
 371
 372         unsigned int jd_blocks;
 373 };
 374
 375 #define GFS2_GLOCKD_DEFAULT     1
 376 #define GFS2_GLOCKD_MAX         16
 377
 378 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 379 #define GFS2_QUOTA_OFF          0
 380 #define GFS2_QUOTA_ACCOUNT      1
 381 #define GFS2_QUOTA_ON           2
 382
 383 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 384 #define GFS2_DATA_WRITEBACK     1
 385 #define GFS2_DATA_ORDERED       2
 386
 387 struct gfs2_args {
 388         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 389         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 390         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 391         int ar_spectator; /* Don't get a journal because we're always RO */
 392         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 393         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 394         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 395         int ar_debug; /* Oops on errors instead of trying to be graceful */
 396         int ar_upgrade; /* Upgrade ondisk/multihost format */
 397         unsigned int ar_num_glockd; /* Number of glockd threads */
 398         int ar_posix_acl; /* Enable posix acls */
 399         int ar_quota; /* off/account/on */
 400         int ar_suiddir; /* suiddir support */
 401         int ar_data; /* ordered/writeback */
 402 };
 403
 404 struct gfs2_tune {
 405         spinlock_t gt_spin;
 406
 407         unsigned int gt_ilimit;
 408         unsigned int gt_ilimit_tries;
 409         unsigned int gt_ilimit_min;
 410         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 411         unsigned int gt_incore_log_blocks;
 412         unsigned int gt_log_flush_secs;
 413         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 414
 415         unsigned int gt_scand_secs;
 416         unsigned int gt_recoverd_secs;
 417         unsigned int gt_logd_secs;
 418         unsigned int gt_quotad_secs;
 419
 420         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 421         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 422         unsigned int gt_quota_scale_num; /* Numerator */
 423         unsigned int gt_quota_scale_den; /* Denominator */
 424         unsigned int gt_quota_cache_secs;
 425         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 426         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 427         unsigned int gt_new_files_jdata;
 428         unsigned int gt_new_files_directio;
 429         unsigned int gt_max_atomic_write; /* Split big writes into this size */
 430         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 431         unsigned int gt_lockdump_size;
 432         unsigned int gt_stall_secs; /* Detects trouble! */
 433         unsigned int gt_complain_secs;
 434         unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 435         unsigned int gt_entries_per_readdir;
 436         unsigned int gt_prefetch_secs; /* Usage window for prefetched glocks */
 437         unsigned int gt_greedy_default;
 438         unsigned int gt_greedy_quantum;
 439         unsigned int gt_greedy_max;
 440         unsigned int gt_statfs_quantum;
 441         unsigned int gt_statfs_slow;
 442 };
 443
 444 enum {
 445         SDF_JOURNAL_CHECKED     = 0,
 446         SDF_JOURNAL_LIVE        = 1,
 447         SDF_SHUTDOWN            = 2,
 448         SDF_NOATIME             = 3,
 449 };
 450
 451 #define GFS2_FSNAME_LEN         256
 452
 453 struct gfs2_sbd {
 454         struct super_block *sd_vfs;
 455         struct super_block *sd_vfs_meta;
 456         struct kobject sd_kobj;
 457         unsigned long sd_flags; /* SDF_... */
 458         struct gfs2_sb sd_sb;
 459
 460         /* Constants computed on mount */
 461
 462         u32 sd_fsb2bb;
 463         u32 sd_fsb2bb_shift;
 464         u32 sd_diptrs;  /* Number of pointers in a dinode */
 465         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 466         u32 sd_jbsize;  /* Size of a journaled data block */
 467         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 468         u32 sd_hash_bsize_shift;
 469         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 470         u32 sd_qc_per_block;
 471         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 472         u32 sd_max_height;      /* Max height of a file's metadata tree */
 473         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 474         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 475         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 476
 477         struct gfs2_args sd_args;       /* Mount arguments */
 478         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 479
 480         /* Lock Stuff */
 481
 482         struct lm_lockstruct sd_lockstruct;
 483         struct list_head sd_reclaim_list;
 484         spinlock_t sd_reclaim_lock;
 485         wait_queue_head_t sd_reclaim_wq;
 486         atomic_t sd_reclaim_count;
 487         struct gfs2_holder sd_live_gh;
 488         struct gfs2_glock *sd_rename_gl;
 489         struct gfs2_glock *sd_trans_gl;
 490
 491         /* Inode Stuff */
 492
 493         struct inode *sd_master_dir;
 494         struct inode *sd_jindex;
 495         struct inode *sd_inum_inode;
 496         struct inode *sd_statfs_inode;
 497         struct inode *sd_ir_inode;
 498         struct inode *sd_sc_inode;
 499         struct inode *sd_qc_inode;
 500         struct inode *sd_rindex;
 501         struct inode *sd_quota_inode;
 502
 503         /* Inum stuff */
 504
 505         struct mutex sd_inum_mutex;
 506
 507         /* StatFS stuff */
 508
 509         spinlock_t sd_statfs_spin;
 510         struct mutex sd_statfs_mutex;
 511         struct gfs2_statfs_change sd_statfs_master;
 512         struct gfs2_statfs_change sd_statfs_local;
 513         unsigned long sd_statfs_sync_time;
 514
 515         /* Resource group stuff */
 516
 517         u64 sd_rindex_vn;
 518         spinlock_t sd_rindex_spin;
 519         struct mutex sd_rindex_mutex;
 520         struct list_head sd_rindex_list;
 521         struct list_head sd_rindex_mru_list;
 522         struct list_head sd_rindex_recent_list;
 523         struct gfs2_rgrpd *sd_rindex_forward;
 524         unsigned int sd_rgrps;
 525
 526         /* Journal index stuff */
 527
 528         struct list_head sd_jindex_list;
 529         spinlock_t sd_jindex_spin;
 530         struct mutex sd_jindex_mutex;
 531         unsigned int sd_journals;
 532         unsigned long sd_jindex_refresh_time;
 533
 534         struct gfs2_jdesc *sd_jdesc;
 535         struct gfs2_holder sd_journal_gh;
 536         struct gfs2_holder sd_jinode_gh;
 537
 538         struct gfs2_holder sd_ir_gh;
 539         struct gfs2_holder sd_sc_gh;
 540         struct gfs2_holder sd_qc_gh;
 541
 542         /* Daemon stuff */
 543
 544         struct task_struct *sd_scand_process;
 545         struct task_struct *sd_recoverd_process;
 546         struct task_struct *sd_logd_process;
 547         struct task_struct *sd_quotad_process;
 548         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 549         unsigned int sd_glockd_num;
 550
 551         /* Quota stuff */
 552
 553         struct list_head sd_quota_list;
 554         atomic_t sd_quota_count;
 555         spinlock_t sd_quota_spin;
 556         struct mutex sd_quota_mutex;
 557
 558         unsigned int sd_quota_slots;
 559         unsigned int sd_quota_chunks;
 560         unsigned char **sd_quota_bitmap;
 561
 562         u64 sd_quota_sync_gen;
 563         unsigned long sd_quota_sync_time;
 564
 565         /* Log stuff */
 566
 567         spinlock_t sd_log_lock;
 568
 569         unsigned int sd_log_blks_reserved;
 570         unsigned int sd_log_commited_buf;
 571         unsigned int sd_log_commited_revoke;
 572
 573         unsigned int sd_log_num_gl;
 574         unsigned int sd_log_num_buf;
 575         unsigned int sd_log_num_revoke;
 576         unsigned int sd_log_num_rg;
 577         unsigned int sd_log_num_databuf;
 578         unsigned int sd_log_num_jdata;
 579         unsigned int sd_log_num_hdrs;
 580
 581         struct list_head sd_log_le_gl;
 582         struct list_head sd_log_le_buf;
 583         struct list_head sd_log_le_revoke;
 584         struct list_head sd_log_le_rg;
 585         struct list_head sd_log_le_databuf;
 586
 587         unsigned int sd_log_blks_free;
 588         struct mutex sd_log_reserve_mutex;
 589
 590         u64 sd_log_sequence;
 591         unsigned int sd_log_head;
 592         unsigned int sd_log_tail;
 593         int sd_log_idle;
 594
 595         unsigned long sd_log_flush_time;
 596         struct rw_semaphore sd_log_flush_lock;
 597         struct list_head sd_log_flush_list;
 598
 599         unsigned int sd_log_flush_head;
 600         u64 sd_log_flush_wrapped;
 601
 602         struct list_head sd_ail1_list;
 603         struct list_head sd_ail2_list;
 604         u64 sd_ail_sync_gen;
 605
 606         /* Replay stuff */
 607
 608         struct list_head sd_revoke_list;
 609         unsigned int sd_replay_tail;
 610
 611         unsigned int sd_found_blocks;
 612         unsigned int sd_found_revokes;
 613         unsigned int sd_replayed_blocks;
 614
 615         /* For quiescing the filesystem */
 616
 617         struct gfs2_holder sd_freeze_gh;
 618         struct mutex sd_freeze_lock;
 619         unsigned int sd_freeze_count;
 620
 621         /* Counters */
 622
 623         atomic_t sd_glock_count;
 624         atomic_t sd_glock_held_count;
 625         atomic_t sd_inode_count;
 626         atomic_t sd_reclaimed;
 627
 628         char sd_fsname[GFS2_FSNAME_LEN];
 629         char sd_table_name[GFS2_FSNAME_LEN];
 630         char sd_proto_name[GFS2_FSNAME_LEN];
 631
 632         /* Debugging crud */
 633
 634         unsigned long sd_last_warning;
 635         struct vfsmount *sd_gfs2mnt;
 636 };
 637
 638 #endif /* __INCORE_DOT_H__ */
 639