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_WAIT        0x00000010
  16 #define DIO_METADATA    0x00000020
  17 #define DIO_DATA        0x00000040
  18 #define DIO_RELEASE     0x00000080
  19 #define DIO_ALL         0x00000100
  20
  21 struct gfs2_log_operations;
  22 struct gfs2_log_element;
  23 struct gfs2_holder;
  24 struct gfs2_glock;
  25 struct gfs2_quota_data;
  26 struct gfs2_trans;
  27 struct gfs2_ail;
  28 struct gfs2_jdesc;
  29 struct gfs2_sbd;
  30
  31 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  32
  33 /*
  34  * Structure of operations that are associated with each
  35  * type of element in the log.
  36  */
  37
  38 struct gfs2_log_operations {
  39         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  40         void (*lo_incore_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  41         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  42         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  43         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  44                                 struct gfs2_log_header *head, int pass);
  45         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  46                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  47                                  int pass);
  48         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  49         const char *lo_name;
  50 };
  51
  52 struct gfs2_log_element {
  53         struct list_head le_list;
  54         const struct gfs2_log_operations *le_ops;
  55 };
  56
  57 struct gfs2_bitmap {
  58         struct buffer_head *bi_bh;
  59         char *bi_clone;
  60         u32 bi_offset;
  61         u32 bi_start;
  62         u32 bi_len;
  63 };
  64
  65 struct gfs2_rgrpd {
  66         struct list_head rd_list;       /* Link with superblock */
  67         struct list_head rd_list_mru;
  68         struct list_head rd_recent;     /* Recently used rgrps */
  69         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  70         struct gfs2_rindex rd_ri;
  71         struct gfs2_rgrp rd_rg;
  72         u64 rd_rg_vn;
  73         struct gfs2_bitmap *rd_bits;
  74         unsigned int rd_bh_count;
  75         struct mutex rd_mutex;
  76         u32 rd_free_clone;
  77         struct gfs2_log_element rd_le;
  78         u32 rd_last_alloc_data;
  79         u32 rd_last_alloc_meta;
  80         struct gfs2_sbd *rd_sbd;
  81 };
  82
  83 enum gfs2_state_bits {
  84         BH_Pinned = BH_PrivateStart,
  85         BH_Escaped = BH_PrivateStart + 1,
  86 };
  87
  88 BUFFER_FNS(Pinned, pinned)
  89 TAS_BUFFER_FNS(Pinned, pinned)
  90 BUFFER_FNS(Escaped, escaped)
  91 TAS_BUFFER_FNS(Escaped, escaped)
  92
  93 struct gfs2_bufdata {
  94         struct buffer_head *bd_bh;
  95         struct gfs2_glock *bd_gl;
  96
  97         struct list_head bd_list_tr;
  98         struct gfs2_log_element bd_le;
  99
 100         struct gfs2_ail *bd_ail;
 101         struct list_head bd_ail_st_list;
 102         struct list_head bd_ail_gl_list;
 103 };
 104
 105 struct gfs2_glock_operations {
 106         void (*go_xmote_th) (struct gfs2_glock * gl, unsigned int state,
 107                              int flags);
 108         void (*go_xmote_bh) (struct gfs2_glock * gl);
 109         void (*go_drop_th) (struct gfs2_glock * gl);
 110         void (*go_drop_bh) (struct gfs2_glock * gl);
 111         void (*go_sync) (struct gfs2_glock * gl, int flags);
 112         void (*go_inval) (struct gfs2_glock * gl, int flags);
 113         int (*go_demote_ok) (struct gfs2_glock * gl);
 114         int (*go_lock) (struct gfs2_holder * gh);
 115         void (*go_unlock) (struct gfs2_holder * gh);
 116         void (*go_callback) (struct gfs2_glock * gl, unsigned int state);
 117         void (*go_greedy) (struct gfs2_glock * gl);
 118         const int go_type;
 119 };
 120
 121 enum {
 122         /* Actions */
 123         HIF_MUTEX               = 0,
 124         HIF_PROMOTE             = 1,
 125         HIF_DEMOTE              = 2,
 126         HIF_GREEDY              = 3,
 127
 128         /* States */
 129         HIF_ALLOCED             = 4,
 130         HIF_DEALLOC             = 5,
 131         HIF_HOLDER              = 6,
 132         HIF_FIRST               = 7,
 133         HIF_ABORTED             = 9,
 134 };
 135
 136 struct gfs2_holder {
 137         struct list_head gh_list;
 138
 139         struct gfs2_glock *gh_gl;
 140         struct task_struct *gh_owner;
 141         unsigned int gh_state;
 142         unsigned gh_flags;
 143
 144         int gh_error;
 145         unsigned long gh_iflags;
 146         struct completion gh_wait;
 147         unsigned long gh_ip;
 148 };
 149
 150 enum {
 151         GLF_LOCK                = 1,
 152         GLF_STICKY              = 2,
 153         GLF_PREFETCH            = 3,
 154         GLF_DIRTY               = 5,
 155         GLF_SKIP_WAITERS2       = 6,
 156         GLF_GREEDY              = 7,
 157 };
 158
 159 struct gfs2_glock {
 160         struct hlist_node gl_list;
 161         unsigned long gl_flags;         /* GLF_... */
 162         struct lm_lockname gl_name;
 163         atomic_t gl_ref;
 164
 165         spinlock_t gl_spin;
 166
 167         unsigned int gl_state;
 168         unsigned int gl_hash;
 169         struct task_struct *gl_owner;
 170         unsigned long gl_ip;
 171         struct list_head gl_holders;
 172         struct list_head gl_waiters1;   /* HIF_MUTEX */
 173         struct list_head gl_waiters2;   /* HIF_DEMOTE, HIF_GREEDY */
 174         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 175
 176         const struct gfs2_glock_operations *gl_ops;
 177
 178         struct gfs2_holder *gl_req_gh;
 179         gfs2_glop_bh_t gl_req_bh;
 180
 181         void *gl_lock;
 182         char *gl_lvb;
 183         atomic_t gl_lvb_count;
 184
 185         u64 gl_vn;
 186         unsigned long gl_stamp;
 187         void *gl_object;
 188
 189         struct list_head gl_reclaim;
 190
 191         struct gfs2_sbd *gl_sbd;
 192
 193         struct inode *gl_aspace;
 194         struct gfs2_log_element gl_le;
 195         struct list_head gl_ail_list;
 196         atomic_t gl_ail_count;
 197 };
 198
 199 struct gfs2_alloc {
 200         /* Quota stuff */
 201
 202         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 203         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 204         unsigned int al_qd_num;
 205
 206         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 207         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 208
 209         /* Filled in by gfs2_inplace_reserve() */
 210
 211         unsigned int al_line;
 212         char *al_file;
 213         struct gfs2_holder al_ri_gh;
 214         struct gfs2_holder al_rgd_gh;
 215         struct gfs2_rgrpd *al_rgd;
 216
 217 };
 218
 219 enum {
 220         GIF_QD_LOCKED           = 1,
 221         GIF_PAGED               = 2,
 222         GIF_SW_PAGED            = 3,
 223 };
 224
 225 struct gfs2_inode {
 226         struct inode i_inode;
 227         struct gfs2_inum i_num;
 228
 229         unsigned long i_flags;          /* GIF_... */
 230
 231         u64 i_vn;
 232         struct gfs2_dinode i_di; /* To be replaced by ref to block */
 233
 234         struct gfs2_glock *i_gl; /* Move into i_gh? */
 235         struct gfs2_holder i_iopen_gh;
 236         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 237         struct gfs2_alloc i_alloc;
 238         u64 i_last_rg_alloc;
 239
 240         spinlock_t i_spin;
 241         struct rw_semaphore i_rw_mutex;
 242         unsigned int i_greedy;
 243         unsigned long i_last_pfault;
 244
 245         struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 246 };
 247
 248 /*
 249  * Since i_inode is the first element of struct gfs2_inode,
 250  * this is effectively a cast.
 251  */
 252 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 253 {
 254         return container_of(inode, struct gfs2_inode, i_inode);
 255 }
 256
 257 /* To be removed? */
 258 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 259 {
 260         return inode->i_sb->s_fs_info;
 261 }
 262
 263 enum {
 264         GFF_DID_DIRECT_ALLOC    = 0,
 265         GFF_EXLOCK = 1,
 266 };
 267
 268 struct gfs2_file {
 269         unsigned long f_flags;          /* GFF_... */
 270         struct mutex f_fl_mutex;
 271         struct gfs2_holder f_fl_gh;
 272 };
 273
 274 struct gfs2_revoke {
 275         struct gfs2_log_element rv_le;
 276         u64 rv_blkno;
 277 };
 278
 279 struct gfs2_revoke_replay {
 280         struct list_head rr_list;
 281         u64 rr_blkno;
 282         unsigned int rr_where;
 283 };
 284
 285 enum {
 286         QDF_USER                = 0,
 287         QDF_CHANGE              = 1,
 288         QDF_LOCKED              = 2,
 289 };
 290
 291 struct gfs2_quota_lvb {
 292         __be32 qb_magic;
 293         u32 __pad;
 294         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 295         __be64 qb_warn;       /* Warn user when alloc is above this # */
 296         __be64 qb_value;       /* Current # blocks allocated */
 297 };
 298
 299 struct gfs2_quota_data {
 300         struct list_head qd_list;
 301         unsigned int qd_count;
 302
 303         u32 qd_id;
 304         unsigned long qd_flags;         /* QDF_... */
 305
 306         s64 qd_change;
 307         s64 qd_change_sync;
 308
 309         unsigned int qd_slot;
 310         unsigned int qd_slot_count;
 311
 312         struct buffer_head *qd_bh;
 313         struct gfs2_quota_change *qd_bh_qc;
 314         unsigned int qd_bh_count;
 315
 316         struct gfs2_glock *qd_gl;
 317         struct gfs2_quota_lvb qd_qb;
 318
 319         u64 qd_sync_gen;
 320         unsigned long qd_last_warn;
 321         unsigned long qd_last_touched;
 322 };
 323
 324 struct gfs2_log_buf {
 325         struct list_head lb_list;
 326         struct buffer_head *lb_bh;
 327         struct buffer_head *lb_real;
 328 };
 329
 330 struct gfs2_trans {
 331         unsigned long tr_ip;
 332
 333         unsigned int tr_blocks;
 334         unsigned int tr_revokes;
 335         unsigned int tr_reserved;
 336
 337         struct gfs2_holder tr_t_gh;
 338
 339         int tr_touched;
 340
 341         unsigned int tr_num_buf;
 342         unsigned int tr_num_buf_new;
 343         unsigned int tr_num_buf_rm;
 344         struct list_head tr_list_buf;
 345
 346         unsigned int tr_num_revoke;
 347         unsigned int tr_num_revoke_rm;
 348 };
 349
 350 struct gfs2_ail {
 351         struct list_head ai_list;
 352
 353         unsigned int ai_first;
 354         struct list_head ai_ail1_list;
 355         struct list_head ai_ail2_list;
 356
 357         u64 ai_sync_gen;
 358 };
 359
 360 struct gfs2_jdesc {
 361         struct list_head jd_list;
 362
 363         struct inode *jd_inode;
 364         unsigned int jd_jid;
 365         int jd_dirty;
 366
 367         unsigned int jd_blocks;
 368 };
 369
 370 #define GFS2_GLOCKD_DEFAULT     1
 371 #define GFS2_GLOCKD_MAX         16
 372
 373 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 374 #define GFS2_QUOTA_OFF          0
 375 #define GFS2_QUOTA_ACCOUNT      1
 376 #define GFS2_QUOTA_ON           2
 377
 378 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 379 #define GFS2_DATA_WRITEBACK     1
 380 #define GFS2_DATA_ORDERED       2
 381
 382 struct gfs2_args {
 383         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 384         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 385         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 386         int ar_spectator; /* Don't get a journal because we're always RO */
 387         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 388         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 389         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 390         int ar_debug; /* Oops on errors instead of trying to be graceful */
 391         int ar_upgrade; /* Upgrade ondisk/multihost format */
 392         unsigned int ar_num_glockd; /* Number of glockd threads */
 393         int ar_posix_acl; /* Enable posix acls */
 394         int ar_quota; /* off/account/on */
 395         int ar_suiddir; /* suiddir support */
 396         int ar_data; /* ordered/writeback */
 397 };
 398
 399 struct gfs2_tune {
 400         spinlock_t gt_spin;
 401
 402         unsigned int gt_ilimit;
 403         unsigned int gt_ilimit_tries;
 404         unsigned int gt_ilimit_min;
 405         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 406         unsigned int gt_incore_log_blocks;
 407         unsigned int gt_log_flush_secs;
 408         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 409
 410         unsigned int gt_scand_secs;
 411         unsigned int gt_recoverd_secs;
 412         unsigned int gt_logd_secs;
 413         unsigned int gt_quotad_secs;
 414
 415         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 416         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 417         unsigned int gt_quota_scale_num; /* Numerator */
 418         unsigned int gt_quota_scale_den; /* Denominator */
 419         unsigned int gt_quota_cache_secs;
 420         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 421         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 422         unsigned int gt_new_files_jdata;
 423         unsigned int gt_new_files_directio;
 424         unsigned int gt_max_atomic_write; /* Split big writes into this size */
 425         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 426         unsigned int gt_lockdump_size;
 427         unsigned int gt_stall_secs; /* Detects trouble! */
 428         unsigned int gt_complain_secs;
 429         unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 430         unsigned int gt_entries_per_readdir;
 431         unsigned int gt_prefetch_secs; /* Usage window for prefetched glocks */
 432         unsigned int gt_greedy_default;
 433         unsigned int gt_greedy_quantum;
 434         unsigned int gt_greedy_max;
 435         unsigned int gt_statfs_quantum;
 436         unsigned int gt_statfs_slow;
 437 };
 438
 439 enum {
 440         SDF_JOURNAL_CHECKED     = 0,
 441         SDF_JOURNAL_LIVE        = 1,
 442         SDF_SHUTDOWN            = 2,
 443         SDF_NOATIME             = 3,
 444 };
 445
 446 #define GFS2_FSNAME_LEN         256
 447
 448 struct gfs2_sbd {
 449         struct super_block *sd_vfs;
 450         struct super_block *sd_vfs_meta;
 451         struct kobject sd_kobj;
 452         unsigned long sd_flags; /* SDF_... */
 453         struct gfs2_sb sd_sb;
 454
 455         /* Constants computed on mount */
 456
 457         u32 sd_fsb2bb;
 458         u32 sd_fsb2bb_shift;
 459         u32 sd_diptrs;  /* Number of pointers in a dinode */
 460         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 461         u32 sd_jbsize;  /* Size of a journaled data block */
 462         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 463         u32 sd_hash_bsize_shift;
 464         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 465         u32 sd_qc_per_block;
 466         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 467         u32 sd_max_height;      /* Max height of a file's metadata tree */
 468         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 469         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 470         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 471
 472         struct gfs2_args sd_args;       /* Mount arguments */
 473         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 474
 475         /* Lock Stuff */
 476
 477         struct lm_lockstruct sd_lockstruct;
 478         struct list_head sd_reclaim_list;
 479         spinlock_t sd_reclaim_lock;
 480         wait_queue_head_t sd_reclaim_wq;
 481         atomic_t sd_reclaim_count;
 482         struct gfs2_holder sd_live_gh;
 483         struct gfs2_glock *sd_rename_gl;
 484         struct gfs2_glock *sd_trans_gl;
 485
 486         /* Inode Stuff */
 487
 488         struct inode *sd_master_dir;
 489         struct inode *sd_jindex;
 490         struct inode *sd_inum_inode;
 491         struct inode *sd_statfs_inode;
 492         struct inode *sd_ir_inode;
 493         struct inode *sd_sc_inode;
 494         struct inode *sd_qc_inode;
 495         struct inode *sd_rindex;
 496         struct inode *sd_quota_inode;
 497
 498         /* Inum stuff */
 499
 500         struct mutex sd_inum_mutex;
 501
 502         /* StatFS stuff */
 503
 504         spinlock_t sd_statfs_spin;
 505         struct mutex sd_statfs_mutex;
 506         struct gfs2_statfs_change sd_statfs_master;
 507         struct gfs2_statfs_change sd_statfs_local;
 508         unsigned long sd_statfs_sync_time;
 509
 510         /* Resource group stuff */
 511
 512         u64 sd_rindex_vn;
 513         spinlock_t sd_rindex_spin;
 514         struct mutex sd_rindex_mutex;
 515         struct list_head sd_rindex_list;
 516         struct list_head sd_rindex_mru_list;
 517         struct list_head sd_rindex_recent_list;
 518         struct gfs2_rgrpd *sd_rindex_forward;
 519         unsigned int sd_rgrps;
 520
 521         /* Journal index stuff */
 522
 523         struct list_head sd_jindex_list;
 524         spinlock_t sd_jindex_spin;
 525         struct mutex sd_jindex_mutex;
 526         unsigned int sd_journals;
 527         unsigned long sd_jindex_refresh_time;
 528
 529         struct gfs2_jdesc *sd_jdesc;
 530         struct gfs2_holder sd_journal_gh;
 531         struct gfs2_holder sd_jinode_gh;
 532
 533         struct gfs2_holder sd_ir_gh;
 534         struct gfs2_holder sd_sc_gh;
 535         struct gfs2_holder sd_qc_gh;
 536
 537         /* Daemon stuff */
 538
 539         struct task_struct *sd_scand_process;
 540         struct task_struct *sd_recoverd_process;
 541         struct task_struct *sd_logd_process;
 542         struct task_struct *sd_quotad_process;
 543         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 544         unsigned int sd_glockd_num;
 545
 546         /* Quota stuff */
 547
 548         struct list_head sd_quota_list;
 549         atomic_t sd_quota_count;
 550         spinlock_t sd_quota_spin;
 551         struct mutex sd_quota_mutex;
 552
 553         unsigned int sd_quota_slots;
 554         unsigned int sd_quota_chunks;
 555         unsigned char **sd_quota_bitmap;
 556
 557         u64 sd_quota_sync_gen;
 558         unsigned long sd_quota_sync_time;
 559
 560         /* Log stuff */
 561
 562         spinlock_t sd_log_lock;
 563
 564         unsigned int sd_log_blks_reserved;
 565         unsigned int sd_log_commited_buf;
 566         unsigned int sd_log_commited_revoke;
 567
 568         unsigned int sd_log_num_gl;
 569         unsigned int sd_log_num_buf;
 570         unsigned int sd_log_num_revoke;
 571         unsigned int sd_log_num_rg;
 572         unsigned int sd_log_num_databuf;
 573         unsigned int sd_log_num_jdata;
 574         unsigned int sd_log_num_hdrs;
 575
 576         struct list_head sd_log_le_gl;
 577         struct list_head sd_log_le_buf;
 578         struct list_head sd_log_le_revoke;
 579         struct list_head sd_log_le_rg;
 580         struct list_head sd_log_le_databuf;
 581
 582         unsigned int sd_log_blks_free;
 583         struct mutex sd_log_reserve_mutex;
 584
 585         u64 sd_log_sequence;
 586         unsigned int sd_log_head;
 587         unsigned int sd_log_tail;
 588         int sd_log_idle;
 589
 590         unsigned long sd_log_flush_time;
 591         struct rw_semaphore sd_log_flush_lock;
 592         struct list_head sd_log_flush_list;
 593
 594         unsigned int sd_log_flush_head;
 595         u64 sd_log_flush_wrapped;
 596
 597         struct list_head sd_ail1_list;
 598         struct list_head sd_ail2_list;
 599         u64 sd_ail_sync_gen;
 600
 601         /* Replay stuff */
 602
 603         struct list_head sd_revoke_list;
 604         unsigned int sd_replay_tail;
 605
 606         unsigned int sd_found_blocks;
 607         unsigned int sd_found_revokes;
 608         unsigned int sd_replayed_blocks;
 609
 610         /* For quiescing the filesystem */
 611
 612         struct gfs2_holder sd_freeze_gh;
 613         struct mutex sd_freeze_lock;
 614         unsigned int sd_freeze_count;
 615
 616         /* Counters */
 617
 618         atomic_t sd_glock_count;
 619         atomic_t sd_glock_held_count;
 620         atomic_t sd_inode_count;
 621         atomic_t sd_reclaimed;
 622
 623         char sd_fsname[GFS2_FSNAME_LEN];
 624         char sd_table_name[GFS2_FSNAME_LEN];
 625         char sd_proto_name[GFS2_FSNAME_LEN];
 626
 627         /* Debugging crud */
 628
 629         unsigned long sd_last_warning;
 630         struct vfsmount *sd_gfs2mnt;
 631 };
 632
 633 #endif /* __INCORE_DOT_H__ */
 634