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_LOCK                = 1,
 156         GLF_STICKY              = 2,
 157         GLF_PREFETCH            = 3,
 158         GLF_DIRTY               = 5,
 159         GLF_SKIP_WAITERS2       = 6,
 160         GLF_GREEDY              = 7,
 161 };
 162
 163 struct gfs2_glock {
 164         struct hlist_node gl_list;
 165         unsigned long gl_flags;         /* GLF_... */
 166         struct lm_lockname gl_name;
 167         atomic_t gl_ref;
 168
 169         spinlock_t gl_spin;
 170
 171         unsigned int gl_state;
 172         unsigned int gl_hash;
 173         struct task_struct *gl_owner;
 174         unsigned long gl_ip;
 175         struct list_head gl_holders;
 176         struct list_head gl_waiters1;   /* HIF_MUTEX */
 177         struct list_head gl_waiters2;   /* HIF_DEMOTE, HIF_GREEDY */
 178         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 179
 180         const struct gfs2_glock_operations *gl_ops;
 181
 182         struct gfs2_holder *gl_req_gh;
 183         gfs2_glop_bh_t gl_req_bh;
 184
 185         void *gl_lock;
 186         char *gl_lvb;
 187         atomic_t gl_lvb_count;
 188
 189         u64 gl_vn;
 190         unsigned long gl_stamp;
 191         void *gl_object;
 192
 193         struct list_head gl_reclaim;
 194
 195         struct gfs2_sbd *gl_sbd;
 196
 197         struct inode *gl_aspace;
 198         struct gfs2_log_element gl_le;
 199         struct list_head gl_ail_list;
 200         atomic_t gl_ail_count;
 201 };
 202
 203 struct gfs2_alloc {
 204         /* Quota stuff */
 205
 206         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 207         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 208         unsigned int al_qd_num;
 209
 210         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 211         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 212
 213         /* Filled in by gfs2_inplace_reserve() */
 214
 215         unsigned int al_line;
 216         char *al_file;
 217         struct gfs2_holder al_ri_gh;
 218         struct gfs2_holder al_rgd_gh;
 219         struct gfs2_rgrpd *al_rgd;
 220
 221 };
 222
 223 enum {
 224         GIF_QD_LOCKED           = 1,
 225         GIF_PAGED               = 2,
 226         GIF_SW_PAGED            = 3,
 227 };
 228
 229 struct gfs2_inode {
 230         struct inode i_inode;
 231         struct gfs2_inum i_num;
 232
 233         unsigned long i_flags;          /* GIF_... */
 234
 235         u64 i_vn;
 236         struct gfs2_dinode i_di; /* To be replaced by ref to block */
 237
 238         struct gfs2_glock *i_gl; /* Move into i_gh? */
 239         struct gfs2_holder i_iopen_gh;
 240         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 241         struct gfs2_alloc i_alloc;
 242         u64 i_last_rg_alloc;
 243
 244         spinlock_t i_spin;
 245         struct rw_semaphore i_rw_mutex;
 246         unsigned int i_greedy;
 247         unsigned long i_last_pfault;
 248
 249         struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 250 };
 251
 252 /*
 253  * Since i_inode is the first element of struct gfs2_inode,
 254  * this is effectively a cast.
 255  */
 256 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 257 {
 258         return container_of(inode, struct gfs2_inode, i_inode);
 259 }
 260
 261 /* To be removed? */
 262 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 263 {
 264         return inode->i_sb->s_fs_info;
 265 }
 266
 267 enum {
 268         GFF_DID_DIRECT_ALLOC    = 0,
 269         GFF_EXLOCK = 1,
 270 };
 271
 272 struct gfs2_file {
 273         unsigned long f_flags;          /* GFF_... */
 274         struct mutex f_fl_mutex;
 275         struct gfs2_holder f_fl_gh;
 276 };
 277
 278 struct gfs2_revoke {
 279         struct gfs2_log_element rv_le;
 280         u64 rv_blkno;
 281 };
 282
 283 struct gfs2_revoke_replay {
 284         struct list_head rr_list;
 285         u64 rr_blkno;
 286         unsigned int rr_where;
 287 };
 288
 289 enum {
 290         QDF_USER                = 0,
 291         QDF_CHANGE              = 1,
 292         QDF_LOCKED              = 2,
 293 };
 294
 295 struct gfs2_quota_lvb {
 296         __be32 qb_magic;
 297         u32 __pad;
 298         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 299         __be64 qb_warn;       /* Warn user when alloc is above this # */
 300         __be64 qb_value;       /* Current # blocks allocated */
 301 };
 302
 303 struct gfs2_quota_data {
 304         struct list_head qd_list;
 305         unsigned int qd_count;
 306
 307         u32 qd_id;
 308         unsigned long qd_flags;         /* QDF_... */
 309
 310         s64 qd_change;
 311         s64 qd_change_sync;
 312
 313         unsigned int qd_slot;
 314         unsigned int qd_slot_count;
 315
 316         struct buffer_head *qd_bh;
 317         struct gfs2_quota_change *qd_bh_qc;
 318         unsigned int qd_bh_count;
 319
 320         struct gfs2_glock *qd_gl;
 321         struct gfs2_quota_lvb qd_qb;
 322
 323         u64 qd_sync_gen;
 324         unsigned long qd_last_warn;
 325         unsigned long qd_last_touched;
 326 };
 327
 328 struct gfs2_log_buf {
 329         struct list_head lb_list;
 330         struct buffer_head *lb_bh;
 331         struct buffer_head *lb_real;
 332 };
 333
 334 struct gfs2_trans {
 335         unsigned long tr_ip;
 336
 337         unsigned int tr_blocks;
 338         unsigned int tr_revokes;
 339         unsigned int tr_reserved;
 340
 341         struct gfs2_holder tr_t_gh;
 342
 343         int tr_touched;
 344
 345         unsigned int tr_num_buf;
 346         unsigned int tr_num_buf_new;
 347         unsigned int tr_num_buf_rm;
 348         struct list_head tr_list_buf;
 349
 350         unsigned int tr_num_revoke;
 351         unsigned int tr_num_revoke_rm;
 352 };
 353
 354 struct gfs2_ail {
 355         struct list_head ai_list;
 356
 357         unsigned int ai_first;
 358         struct list_head ai_ail1_list;
 359         struct list_head ai_ail2_list;
 360
 361         u64 ai_sync_gen;
 362 };
 363
 364 struct gfs2_jdesc {
 365         struct list_head jd_list;
 366
 367         struct inode *jd_inode;
 368         unsigned int jd_jid;
 369         int jd_dirty;
 370
 371         unsigned int jd_blocks;
 372 };
 373
 374 #define GFS2_GLOCKD_DEFAULT     1
 375 #define GFS2_GLOCKD_MAX         16
 376
 377 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 378 #define GFS2_QUOTA_OFF          0
 379 #define GFS2_QUOTA_ACCOUNT      1
 380 #define GFS2_QUOTA_ON           2
 381
 382 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 383 #define GFS2_DATA_WRITEBACK     1
 384 #define GFS2_DATA_ORDERED       2
 385
 386 struct gfs2_args {
 387         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 388         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 389         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 390         int ar_spectator; /* Don't get a journal because we're always RO */
 391         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 392         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 393         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 394         int ar_debug; /* Oops on errors instead of trying to be graceful */
 395         int ar_upgrade; /* Upgrade ondisk/multihost format */
 396         unsigned int ar_num_glockd; /* Number of glockd threads */
 397         int ar_posix_acl; /* Enable posix acls */
 398         int ar_quota; /* off/account/on */
 399         int ar_suiddir; /* suiddir support */
 400         int ar_data; /* ordered/writeback */
 401 };
 402
 403 struct gfs2_tune {
 404         spinlock_t gt_spin;
 405
 406         unsigned int gt_ilimit;
 407         unsigned int gt_ilimit_tries;
 408         unsigned int gt_ilimit_min;
 409         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 410         unsigned int gt_incore_log_blocks;
 411         unsigned int gt_log_flush_secs;
 412         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 413
 414         unsigned int gt_scand_secs;
 415         unsigned int gt_recoverd_secs;
 416         unsigned int gt_logd_secs;
 417         unsigned int gt_quotad_secs;
 418
 419         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 420         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 421         unsigned int gt_quota_scale_num; /* Numerator */
 422         unsigned int gt_quota_scale_den; /* Denominator */
 423         unsigned int gt_quota_cache_secs;
 424         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 425         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 426         unsigned int gt_new_files_jdata;
 427         unsigned int gt_new_files_directio;
 428         unsigned int gt_max_atomic_write; /* Split big writes into this size */
 429         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 430         unsigned int gt_lockdump_size;
 431         unsigned int gt_stall_secs; /* Detects trouble! */
 432         unsigned int gt_complain_secs;
 433         unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 434         unsigned int gt_entries_per_readdir;
 435         unsigned int gt_prefetch_secs; /* Usage window for prefetched glocks */
 436         unsigned int gt_greedy_default;
 437         unsigned int gt_greedy_quantum;
 438         unsigned int gt_greedy_max;
 439         unsigned int gt_statfs_quantum;
 440         unsigned int gt_statfs_slow;
 441 };
 442
 443 enum {
 444         SDF_JOURNAL_CHECKED     = 0,
 445         SDF_JOURNAL_LIVE        = 1,
 446         SDF_SHUTDOWN            = 2,
 447         SDF_NOATIME             = 3,
 448 };
 449
 450 #define GFS2_FSNAME_LEN         256
 451
 452 struct gfs2_sbd {
 453         struct super_block *sd_vfs;
 454         struct super_block *sd_vfs_meta;
 455         struct kobject sd_kobj;
 456         unsigned long sd_flags; /* SDF_... */
 457         struct gfs2_sb sd_sb;
 458
 459         /* Constants computed on mount */
 460
 461         u32 sd_fsb2bb;
 462         u32 sd_fsb2bb_shift;
 463         u32 sd_diptrs;  /* Number of pointers in a dinode */
 464         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 465         u32 sd_jbsize;  /* Size of a journaled data block */
 466         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 467         u32 sd_hash_bsize_shift;
 468         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 469         u32 sd_qc_per_block;
 470         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 471         u32 sd_max_height;      /* Max height of a file's metadata tree */
 472         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 473         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 474         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 475
 476         struct gfs2_args sd_args;       /* Mount arguments */
 477         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 478
 479         /* Lock Stuff */
 480
 481         struct lm_lockstruct sd_lockstruct;
 482         struct list_head sd_reclaim_list;
 483         spinlock_t sd_reclaim_lock;
 484         wait_queue_head_t sd_reclaim_wq;
 485         atomic_t sd_reclaim_count;
 486         struct gfs2_holder sd_live_gh;
 487         struct gfs2_glock *sd_rename_gl;
 488         struct gfs2_glock *sd_trans_gl;
 489
 490         /* Inode Stuff */
 491
 492         struct inode *sd_master_dir;
 493         struct inode *sd_jindex;
 494         struct inode *sd_inum_inode;
 495         struct inode *sd_statfs_inode;
 496         struct inode *sd_ir_inode;
 497         struct inode *sd_sc_inode;
 498         struct inode *sd_qc_inode;
 499         struct inode *sd_rindex;
 500         struct inode *sd_quota_inode;
 501
 502         /* Inum stuff */
 503
 504         struct mutex sd_inum_mutex;
 505
 506         /* StatFS stuff */
 507
 508         spinlock_t sd_statfs_spin;
 509         struct mutex sd_statfs_mutex;
 510         struct gfs2_statfs_change sd_statfs_master;
 511         struct gfs2_statfs_change sd_statfs_local;
 512         unsigned long sd_statfs_sync_time;
 513
 514         /* Resource group stuff */
 515
 516         u64 sd_rindex_vn;
 517         spinlock_t sd_rindex_spin;
 518         struct mutex sd_rindex_mutex;
 519         struct list_head sd_rindex_list;
 520         struct list_head sd_rindex_mru_list;
 521         struct list_head sd_rindex_recent_list;
 522         struct gfs2_rgrpd *sd_rindex_forward;
 523         unsigned int sd_rgrps;
 524
 525         /* Journal index stuff */
 526
 527         struct list_head sd_jindex_list;
 528         spinlock_t sd_jindex_spin;
 529         struct mutex sd_jindex_mutex;
 530         unsigned int sd_journals;
 531         unsigned long sd_jindex_refresh_time;
 532
 533         struct gfs2_jdesc *sd_jdesc;
 534         struct gfs2_holder sd_journal_gh;
 535         struct gfs2_holder sd_jinode_gh;
 536
 537         struct gfs2_holder sd_ir_gh;
 538         struct gfs2_holder sd_sc_gh;
 539         struct gfs2_holder sd_qc_gh;
 540
 541         /* Daemon stuff */
 542
 543         struct task_struct *sd_scand_process;
 544         struct task_struct *sd_recoverd_process;
 545         struct task_struct *sd_logd_process;
 546         struct task_struct *sd_quotad_process;
 547         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 548         unsigned int sd_glockd_num;
 549
 550         /* Quota stuff */
 551
 552         struct list_head sd_quota_list;
 553         atomic_t sd_quota_count;
 554         spinlock_t sd_quota_spin;
 555         struct mutex sd_quota_mutex;
 556
 557         unsigned int sd_quota_slots;
 558         unsigned int sd_quota_chunks;
 559         unsigned char **sd_quota_bitmap;
 560
 561         u64 sd_quota_sync_gen;
 562         unsigned long sd_quota_sync_time;
 563
 564         /* Log stuff */
 565
 566         spinlock_t sd_log_lock;
 567
 568         unsigned int sd_log_blks_reserved;
 569         unsigned int sd_log_commited_buf;
 570         unsigned int sd_log_commited_revoke;
 571
 572         unsigned int sd_log_num_gl;
 573         unsigned int sd_log_num_buf;
 574         unsigned int sd_log_num_revoke;
 575         unsigned int sd_log_num_rg;
 576         unsigned int sd_log_num_databuf;
 577         unsigned int sd_log_num_jdata;
 578         unsigned int sd_log_num_hdrs;
 579
 580         struct list_head sd_log_le_gl;
 581         struct list_head sd_log_le_buf;
 582         struct list_head sd_log_le_revoke;
 583         struct list_head sd_log_le_rg;
 584         struct list_head sd_log_le_databuf;
 585
 586         unsigned int sd_log_blks_free;
 587         struct mutex sd_log_reserve_mutex;
 588
 589         u64 sd_log_sequence;
 590         unsigned int sd_log_head;
 591         unsigned int sd_log_tail;
 592         int sd_log_idle;
 593
 594         unsigned long sd_log_flush_time;
 595         struct rw_semaphore sd_log_flush_lock;
 596         struct list_head sd_log_flush_list;
 597
 598         unsigned int sd_log_flush_head;
 599         u64 sd_log_flush_wrapped;
 600
 601         struct list_head sd_ail1_list;
 602         struct list_head sd_ail2_list;
 603         u64 sd_ail_sync_gen;
 604
 605         /* Replay stuff */
 606
 607         struct list_head sd_revoke_list;
 608         unsigned int sd_replay_tail;
 609
 610         unsigned int sd_found_blocks;
 611         unsigned int sd_found_revokes;
 612         unsigned int sd_replayed_blocks;
 613
 614         /* For quiescing the filesystem */
 615
 616         struct gfs2_holder sd_freeze_gh;
 617         struct mutex sd_freeze_lock;
 618         unsigned int sd_freeze_count;
 619
 620         /* Counters */
 621
 622         atomic_t sd_glock_count;
 623         atomic_t sd_glock_held_count;
 624         atomic_t sd_inode_count;
 625         atomic_t sd_reclaimed;
 626
 627         char sd_fsname[GFS2_FSNAME_LEN];
 628         char sd_table_name[GFS2_FSNAME_LEN];
 629         char sd_proto_name[GFS2_FSNAME_LEN];
 630
 631         /* Debugging crud */
 632
 633         unsigned long sd_last_warning;
 634         struct vfsmount *sd_gfs2mnt;
 635 };
 636
 637 #endif /* __INCORE_DOT_H__ */
 638