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_START       0x00000008
  16 #define DIO_WAIT        0x00000010
  17 #define DIO_METADATA    0x00000020
  18 #define DIO_DATA        0x00000040
  19 #define DIO_RELEASE     0x00000080
  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
  32 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  33
  34 /*
  35  * Structure of operations that are associated with each
  36  * type of element in the log.
  37  */
  38
  39 struct gfs2_log_operations {
  40         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  41         void (*lo_incore_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  42         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  43         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  44         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  45                                 struct gfs2_log_header *head, int pass);
  46         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  47                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  48                                  int pass);
  49         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  50         const char *lo_name;
  51 };
  52
  53 struct gfs2_log_element {
  54         struct list_head le_list;
  55         const struct gfs2_log_operations *le_ops;
  56 };
  57
  58 struct gfs2_bitmap {
  59         struct buffer_head *bi_bh;
  60         char *bi_clone;
  61         u32 bi_offset;
  62         u32 bi_start;
  63         u32 bi_len;
  64 };
  65
  66 struct gfs2_rgrpd {
  67         struct list_head rd_list;       /* Link with superblock */
  68         struct list_head rd_list_mru;
  69         struct list_head rd_recent;     /* Recently used rgrps */
  70         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  71         struct gfs2_rindex rd_ri;
  72         struct gfs2_rgrp rd_rg;
  73         u64 rd_rg_vn;
  74         struct gfs2_bitmap *rd_bits;
  75         unsigned int rd_bh_count;
  76         struct mutex rd_mutex;
  77         u32 rd_free_clone;
  78         struct gfs2_log_element rd_le;
  79         u32 rd_last_alloc_data;
  80         u32 rd_last_alloc_meta;
  81         struct gfs2_sbd *rd_sbd;
  82 };
  83
  84 enum gfs2_state_bits {
  85         BH_Pinned = BH_PrivateStart,
  86         BH_Escaped = BH_PrivateStart + 1,
  87 };
  88
  89 BUFFER_FNS(Pinned, pinned)
  90 TAS_BUFFER_FNS(Pinned, pinned)
  91 BUFFER_FNS(Escaped, escaped)
  92 TAS_BUFFER_FNS(Escaped, escaped)
  93
  94 struct gfs2_bufdata {
  95         struct buffer_head *bd_bh;
  96         struct gfs2_glock *bd_gl;
  97
  98         struct list_head bd_list_tr;
  99         struct gfs2_log_element bd_le;
 100
 101         struct gfs2_ail *bd_ail;
 102         struct list_head bd_ail_st_list;
 103         struct list_head bd_ail_gl_list;
 104 };
 105
 106 struct gfs2_glock_operations {
 107         void (*go_xmote_th) (struct gfs2_glock * gl, unsigned int state,
 108                              int flags);
 109         void (*go_xmote_bh) (struct gfs2_glock * gl);
 110         void (*go_drop_th) (struct gfs2_glock * gl);
 111         void (*go_drop_bh) (struct gfs2_glock * gl);
 112         void (*go_sync) (struct gfs2_glock * gl, int flags);
 113         void (*go_inval) (struct gfs2_glock * gl, int flags);
 114         int (*go_demote_ok) (struct gfs2_glock * gl);
 115         int (*go_lock) (struct gfs2_holder * gh);
 116         void (*go_unlock) (struct gfs2_holder * gh);
 117         void (*go_callback) (struct gfs2_glock * gl, unsigned int state);
 118         void (*go_greedy) (struct gfs2_glock * gl);
 119         const int go_type;
 120 };
 121
 122 enum {
 123         /* Actions */
 124         HIF_MUTEX               = 0,
 125         HIF_PROMOTE             = 1,
 126         HIF_DEMOTE              = 2,
 127         HIF_GREEDY              = 3,
 128
 129         /* States */
 130         HIF_ALLOCED             = 4,
 131         HIF_DEALLOC             = 5,
 132         HIF_HOLDER              = 6,
 133         HIF_FIRST               = 7,
 134         HIF_ABORTED             = 9,
 135 };
 136
 137 struct gfs2_holder {
 138         struct list_head gh_list;
 139
 140         struct gfs2_glock *gh_gl;
 141         struct task_struct *gh_owner;
 142         unsigned int gh_state;
 143         unsigned gh_flags;
 144
 145         int gh_error;
 146         unsigned long gh_iflags;
 147         struct completion gh_wait;
 148         unsigned long gh_ip;
 149 };
 150
 151 enum {
 152         GLF_LOCK                = 1,
 153         GLF_STICKY              = 2,
 154         GLF_PREFETCH            = 3,
 155         GLF_DIRTY               = 5,
 156         GLF_SKIP_WAITERS2       = 6,
 157         GLF_GREEDY              = 7,
 158 };
 159
 160 struct gfs2_glock {
 161         struct hlist_node gl_list;
 162         unsigned long gl_flags;         /* GLF_... */
 163         struct lm_lockname gl_name;
 164         atomic_t gl_ref;
 165
 166         spinlock_t gl_spin;
 167
 168         unsigned int gl_state;
 169         unsigned int gl_hash;
 170         struct task_struct *gl_owner;
 171         unsigned long gl_ip;
 172         struct list_head gl_holders;
 173         struct list_head gl_waiters1;   /* HIF_MUTEX */
 174         struct list_head gl_waiters2;   /* HIF_DEMOTE, HIF_GREEDY */
 175         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 176
 177         const struct gfs2_glock_operations *gl_ops;
 178
 179         struct gfs2_holder *gl_req_gh;
 180         gfs2_glop_bh_t gl_req_bh;
 181
 182         void *gl_lock;
 183         char *gl_lvb;
 184         atomic_t gl_lvb_count;
 185
 186         u64 gl_vn;
 187         unsigned long gl_stamp;
 188         void *gl_object;
 189
 190         struct list_head gl_reclaim;
 191
 192         struct gfs2_sbd *gl_sbd;
 193
 194         struct inode *gl_aspace;
 195         struct gfs2_log_element gl_le;
 196         struct list_head gl_ail_list;
 197         atomic_t gl_ail_count;
 198 };
 199
 200 struct gfs2_alloc {
 201         /* Quota stuff */
 202
 203         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 204         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 205         unsigned int al_qd_num;
 206
 207         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 208         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 209
 210         /* Filled in by gfs2_inplace_reserve() */
 211
 212         unsigned int al_line;
 213         char *al_file;
 214         struct gfs2_holder al_ri_gh;
 215         struct gfs2_holder al_rgd_gh;
 216         struct gfs2_rgrpd *al_rgd;
 217
 218 };
 219
 220 enum {
 221         GIF_QD_LOCKED           = 1,
 222         GIF_PAGED               = 2,
 223         GIF_SW_PAGED            = 3,
 224 };
 225
 226 struct gfs2_inode {
 227         struct inode i_inode;
 228         struct gfs2_inum i_num;
 229
 230         unsigned long i_flags;          /* GIF_... */
 231
 232         u64 i_vn;
 233         struct gfs2_dinode i_di; /* To be replaced by ref to block */
 234
 235         struct gfs2_glock *i_gl; /* Move into i_gh? */
 236         struct gfs2_holder i_iopen_gh;
 237         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 238         struct gfs2_alloc i_alloc;
 239         u64 i_last_rg_alloc;
 240
 241         spinlock_t i_spin;
 242         struct rw_semaphore i_rw_mutex;
 243         unsigned int i_greedy;
 244         unsigned long i_last_pfault;
 245
 246         struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 247 };
 248
 249 /*
 250  * Since i_inode is the first element of struct gfs2_inode,
 251  * this is effectively a cast.
 252  */
 253 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 254 {
 255         return container_of(inode, struct gfs2_inode, i_inode);
 256 }
 257
 258 /* To be removed? */
 259 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 260 {
 261         return inode->i_sb->s_fs_info;
 262 }
 263
 264 enum {
 265         GFF_DID_DIRECT_ALLOC    = 0,
 266         GFF_EXLOCK = 1,
 267 };
 268
 269 struct gfs2_file {
 270         unsigned long f_flags;          /* GFF_... */
 271         struct mutex f_fl_mutex;
 272         struct gfs2_holder f_fl_gh;
 273 };
 274
 275 struct gfs2_revoke {
 276         struct gfs2_log_element rv_le;
 277         u64 rv_blkno;
 278 };
 279
 280 struct gfs2_revoke_replay {
 281         struct list_head rr_list;
 282         u64 rr_blkno;
 283         unsigned int rr_where;
 284 };
 285
 286 enum {
 287         QDF_USER                = 0,
 288         QDF_CHANGE              = 1,
 289         QDF_LOCKED              = 2,
 290 };
 291
 292 struct gfs2_quota_lvb {
 293         __be32 qb_magic;
 294         u32 __pad;
 295         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 296         __be64 qb_warn;       /* Warn user when alloc is above this # */
 297         __be64 qb_value;       /* Current # blocks allocated */
 298 };
 299
 300 struct gfs2_quota_data {
 301         struct list_head qd_list;
 302         unsigned int qd_count;
 303
 304         u32 qd_id;
 305         unsigned long qd_flags;         /* QDF_... */
 306
 307         s64 qd_change;
 308         s64 qd_change_sync;
 309
 310         unsigned int qd_slot;
 311         unsigned int qd_slot_count;
 312
 313         struct buffer_head *qd_bh;
 314         struct gfs2_quota_change *qd_bh_qc;
 315         unsigned int qd_bh_count;
 316
 317         struct gfs2_glock *qd_gl;
 318         struct gfs2_quota_lvb qd_qb;
 319
 320         u64 qd_sync_gen;
 321         unsigned long qd_last_warn;
 322         unsigned long qd_last_touched;
 323 };
 324
 325 struct gfs2_log_buf {
 326         struct list_head lb_list;
 327         struct buffer_head *lb_bh;
 328         struct buffer_head *lb_real;
 329 };
 330
 331 struct gfs2_trans {
 332         unsigned long tr_ip;
 333
 334         unsigned int tr_blocks;
 335         unsigned int tr_revokes;
 336         unsigned int tr_reserved;
 337
 338         struct gfs2_holder tr_t_gh;
 339
 340         int tr_touched;
 341
 342         unsigned int tr_num_buf;
 343         unsigned int tr_num_buf_new;
 344         unsigned int tr_num_buf_rm;
 345         struct list_head tr_list_buf;
 346
 347         unsigned int tr_num_revoke;
 348         unsigned int tr_num_revoke_rm;
 349 };
 350
 351 struct gfs2_ail {
 352         struct list_head ai_list;
 353
 354         unsigned int ai_first;
 355         struct list_head ai_ail1_list;
 356         struct list_head ai_ail2_list;
 357
 358         u64 ai_sync_gen;
 359 };
 360
 361 struct gfs2_jdesc {
 362         struct list_head jd_list;
 363
 364         struct inode *jd_inode;
 365         unsigned int jd_jid;
 366         int jd_dirty;
 367
 368         unsigned int jd_blocks;
 369 };
 370
 371 #define GFS2_GLOCKD_DEFAULT     1
 372 #define GFS2_GLOCKD_MAX         16
 373
 374 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 375 #define GFS2_QUOTA_OFF          0
 376 #define GFS2_QUOTA_ACCOUNT      1
 377 #define GFS2_QUOTA_ON           2
 378
 379 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 380 #define GFS2_DATA_WRITEBACK     1
 381 #define GFS2_DATA_ORDERED       2
 382
 383 struct gfs2_args {
 384         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 385         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 386         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 387         int ar_spectator; /* Don't get a journal because we're always RO */
 388         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 389         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 390         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 391         int ar_debug; /* Oops on errors instead of trying to be graceful */
 392         int ar_upgrade; /* Upgrade ondisk/multihost format */
 393         unsigned int ar_num_glockd; /* Number of glockd threads */
 394         int ar_posix_acl; /* Enable posix acls */
 395         int ar_quota; /* off/account/on */
 396         int ar_suiddir; /* suiddir support */
 397         int ar_data; /* ordered/writeback */
 398 };
 399
 400 struct gfs2_tune {
 401         spinlock_t gt_spin;
 402
 403         unsigned int gt_ilimit;
 404         unsigned int gt_ilimit_tries;
 405         unsigned int gt_ilimit_min;
 406         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 407         unsigned int gt_incore_log_blocks;
 408         unsigned int gt_log_flush_secs;
 409         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 410
 411         unsigned int gt_scand_secs;
 412         unsigned int gt_recoverd_secs;
 413         unsigned int gt_logd_secs;
 414         unsigned int gt_quotad_secs;
 415
 416         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 417         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 418         unsigned int gt_quota_scale_num; /* Numerator */
 419         unsigned int gt_quota_scale_den; /* Denominator */
 420         unsigned int gt_quota_cache_secs;
 421         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 422         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 423         unsigned int gt_new_files_jdata;
 424         unsigned int gt_new_files_directio;
 425         unsigned int gt_max_atomic_write; /* Split big writes into this size */
 426         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 427         unsigned int gt_lockdump_size;
 428         unsigned int gt_stall_secs; /* Detects trouble! */
 429         unsigned int gt_complain_secs;
 430         unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 431         unsigned int gt_entries_per_readdir;
 432         unsigned int gt_prefetch_secs; /* Usage window for prefetched glocks */
 433         unsigned int gt_greedy_default;
 434         unsigned int gt_greedy_quantum;
 435         unsigned int gt_greedy_max;
 436         unsigned int gt_statfs_quantum;
 437         unsigned int gt_statfs_slow;
 438 };
 439
 440 enum {
 441         SDF_JOURNAL_CHECKED     = 0,
 442         SDF_JOURNAL_LIVE        = 1,
 443         SDF_SHUTDOWN            = 2,
 444         SDF_NOATIME             = 3,
 445 };
 446
 447 #define GFS2_FSNAME_LEN         256
 448
 449 struct gfs2_sbd {
 450         struct super_block *sd_vfs;
 451         struct super_block *sd_vfs_meta;
 452         struct kobject sd_kobj;
 453         unsigned long sd_flags; /* SDF_... */
 454         struct gfs2_sb sd_sb;
 455
 456         /* Constants computed on mount */
 457
 458         u32 sd_fsb2bb;
 459         u32 sd_fsb2bb_shift;
 460         u32 sd_diptrs;  /* Number of pointers in a dinode */
 461         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 462         u32 sd_jbsize;  /* Size of a journaled data block */
 463         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 464         u32 sd_hash_bsize_shift;
 465         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 466         u32 sd_qc_per_block;
 467         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 468         u32 sd_max_height;      /* Max height of a file's metadata tree */
 469         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 470         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 471         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 472
 473         struct gfs2_args sd_args;       /* Mount arguments */
 474         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 475
 476         /* Lock Stuff */
 477
 478         struct lm_lockstruct sd_lockstruct;
 479         struct list_head sd_reclaim_list;
 480         spinlock_t sd_reclaim_lock;
 481         wait_queue_head_t sd_reclaim_wq;
 482         atomic_t sd_reclaim_count;
 483         struct gfs2_holder sd_live_gh;
 484         struct gfs2_glock *sd_rename_gl;
 485         struct gfs2_glock *sd_trans_gl;
 486
 487         /* Inode Stuff */
 488
 489         struct inode *sd_master_dir;
 490         struct inode *sd_jindex;
 491         struct inode *sd_inum_inode;
 492         struct inode *sd_statfs_inode;
 493         struct inode *sd_ir_inode;
 494         struct inode *sd_sc_inode;
 495         struct inode *sd_qc_inode;
 496         struct inode *sd_rindex;
 497         struct inode *sd_quota_inode;
 498
 499         /* Inum stuff */
 500
 501         struct mutex sd_inum_mutex;
 502
 503         /* StatFS stuff */
 504
 505         spinlock_t sd_statfs_spin;
 506         struct mutex sd_statfs_mutex;
 507         struct gfs2_statfs_change sd_statfs_master;
 508         struct gfs2_statfs_change sd_statfs_local;
 509         unsigned long sd_statfs_sync_time;
 510
 511         /* Resource group stuff */
 512
 513         u64 sd_rindex_vn;
 514         spinlock_t sd_rindex_spin;
 515         struct mutex sd_rindex_mutex;
 516         struct list_head sd_rindex_list;
 517         struct list_head sd_rindex_mru_list;
 518         struct list_head sd_rindex_recent_list;
 519         struct gfs2_rgrpd *sd_rindex_forward;
 520         unsigned int sd_rgrps;
 521
 522         /* Journal index stuff */
 523
 524         struct list_head sd_jindex_list;
 525         spinlock_t sd_jindex_spin;
 526         struct mutex sd_jindex_mutex;
 527         unsigned int sd_journals;
 528         unsigned long sd_jindex_refresh_time;
 529
 530         struct gfs2_jdesc *sd_jdesc;
 531         struct gfs2_holder sd_journal_gh;
 532         struct gfs2_holder sd_jinode_gh;
 533
 534         struct gfs2_holder sd_ir_gh;
 535         struct gfs2_holder sd_sc_gh;
 536         struct gfs2_holder sd_qc_gh;
 537
 538         /* Daemon stuff */
 539
 540         struct task_struct *sd_scand_process;
 541         struct task_struct *sd_recoverd_process;
 542         struct task_struct *sd_logd_process;
 543         struct task_struct *sd_quotad_process;
 544         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 545         unsigned int sd_glockd_num;
 546
 547         /* Quota stuff */
 548
 549         struct list_head sd_quota_list;
 550         atomic_t sd_quota_count;
 551         spinlock_t sd_quota_spin;
 552         struct mutex sd_quota_mutex;
 553
 554         unsigned int sd_quota_slots;
 555         unsigned int sd_quota_chunks;
 556         unsigned char **sd_quota_bitmap;
 557
 558         u64 sd_quota_sync_gen;
 559         unsigned long sd_quota_sync_time;
 560
 561         /* Log stuff */
 562
 563         spinlock_t sd_log_lock;
 564
 565         unsigned int sd_log_blks_reserved;
 566         unsigned int sd_log_commited_buf;
 567         unsigned int sd_log_commited_revoke;
 568
 569         unsigned int sd_log_num_gl;
 570         unsigned int sd_log_num_buf;
 571         unsigned int sd_log_num_revoke;
 572         unsigned int sd_log_num_rg;
 573         unsigned int sd_log_num_databuf;
 574         unsigned int sd_log_num_jdata;
 575         unsigned int sd_log_num_hdrs;
 576
 577         struct list_head sd_log_le_gl;
 578         struct list_head sd_log_le_buf;
 579         struct list_head sd_log_le_revoke;
 580         struct list_head sd_log_le_rg;
 581         struct list_head sd_log_le_databuf;
 582
 583         unsigned int sd_log_blks_free;
 584         struct mutex sd_log_reserve_mutex;
 585
 586         u64 sd_log_sequence;
 587         unsigned int sd_log_head;
 588         unsigned int sd_log_tail;
 589         int sd_log_idle;
 590
 591         unsigned long sd_log_flush_time;
 592         struct rw_semaphore sd_log_flush_lock;
 593         struct list_head sd_log_flush_list;
 594
 595         unsigned int sd_log_flush_head;
 596         u64 sd_log_flush_wrapped;
 597
 598         struct list_head sd_ail1_list;
 599         struct list_head sd_ail2_list;
 600         u64 sd_ail_sync_gen;
 601
 602         /* Replay stuff */
 603
 604         struct list_head sd_revoke_list;
 605         unsigned int sd_replay_tail;
 606
 607         unsigned int sd_found_blocks;
 608         unsigned int sd_found_revokes;
 609         unsigned int sd_replayed_blocks;
 610
 611         /* For quiescing the filesystem */
 612
 613         struct gfs2_holder sd_freeze_gh;
 614         struct mutex sd_freeze_lock;
 615         unsigned int sd_freeze_count;
 616
 617         /* Counters */
 618
 619         atomic_t sd_glock_count;
 620         atomic_t sd_glock_held_count;
 621         atomic_t sd_inode_count;
 622         atomic_t sd_reclaimed;
 623
 624         char sd_fsname[GFS2_FSNAME_LEN];
 625         char sd_table_name[GFS2_FSNAME_LEN];
 626         char sd_proto_name[GFS2_FSNAME_LEN];
 627
 628         /* Debugging crud */
 629
 630         unsigned long sd_last_warning;
 631         struct vfsmount *sd_gfs2mnt;
 632 };
 633
 634 #endif /* __INCORE_DOT_H__ */
 635