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_ALL         0x00000100
  18
  19 struct gfs2_log_operations;
  20 struct gfs2_log_element;
  21 struct gfs2_holder;
  22 struct gfs2_glock;
  23 struct gfs2_quota_data;
  24 struct gfs2_trans;
  25 struct gfs2_ail;
  26 struct gfs2_jdesc;
  27 struct gfs2_sbd;
  28
  29 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  30
  31 /*
  32  * Structure of operations that are associated with each
  33  * type of element in the log.
  34  */
  35
  36 struct gfs2_log_operations {
  37         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  38         void (*lo_incore_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  39         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  40         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  41         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  42                                 struct gfs2_log_header_host *head, int pass);
  43         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  44                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  45                                  int pass);
  46         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  47         const char *lo_name;
  48 };
  49
  50 struct gfs2_log_element {
  51         struct list_head le_list;
  52         const struct gfs2_log_operations *le_ops;
  53 };
  54
  55 struct gfs2_bitmap {
  56         struct buffer_head *bi_bh;
  57         char *bi_clone;
  58         u32 bi_offset;
  59         u32 bi_start;
  60         u32 bi_len;
  61 };
  62
  63 struct gfs2_rgrpd {
  64         struct list_head rd_list;       /* Link with superblock */
  65         struct list_head rd_list_mru;
  66         struct list_head rd_recent;     /* Recently used rgrps */
  67         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  68         struct gfs2_rindex_host rd_ri;
  69         struct gfs2_rgrp_host rd_rg;
  70         u64 rd_rg_vn;
  71         struct gfs2_bitmap *rd_bits;
  72         unsigned int rd_bh_count;
  73         struct mutex rd_mutex;
  74         u32 rd_free_clone;
  75         struct gfs2_log_element rd_le;
  76         u32 rd_last_alloc_data;
  77         u32 rd_last_alloc_meta;
  78         struct gfs2_sbd *rd_sbd;
  79 };
  80
  81 enum gfs2_state_bits {
  82         BH_Pinned = BH_PrivateStart,
  83         BH_Escaped = BH_PrivateStart + 1,
  84 };
  85
  86 BUFFER_FNS(Pinned, pinned)
  87 TAS_BUFFER_FNS(Pinned, pinned)
  88 BUFFER_FNS(Escaped, escaped)
  89 TAS_BUFFER_FNS(Escaped, escaped)
  90
  91 struct gfs2_bufdata {
  92         struct buffer_head *bd_bh;
  93         struct gfs2_glock *bd_gl;
  94
  95         struct list_head bd_list_tr;
  96         struct gfs2_log_element bd_le;
  97
  98         struct gfs2_ail *bd_ail;
  99         struct list_head bd_ail_st_list;
 100         struct list_head bd_ail_gl_list;
 101 };
 102
 103 struct gfs2_glock_operations {
 104         void (*go_xmote_th) (struct gfs2_glock *gl);
 105         void (*go_xmote_bh) (struct gfs2_glock *gl);
 106         void (*go_drop_th) (struct gfs2_glock *gl);
 107         void (*go_inval) (struct gfs2_glock *gl, int flags);
 108         int (*go_demote_ok) (struct gfs2_glock *gl);
 109         int (*go_lock) (struct gfs2_holder *gh);
 110         void (*go_unlock) (struct gfs2_holder *gh);
 111         const int go_type;
 112 };
 113
 114 enum {
 115         /* Actions */
 116         HIF_MUTEX               = 0,
 117         HIF_PROMOTE             = 1,
 118         HIF_DEMOTE              = 2,
 119
 120         /* States */
 121         HIF_ALLOCED             = 4,
 122         HIF_DEALLOC             = 5,
 123         HIF_HOLDER              = 6,
 124         HIF_FIRST               = 7,
 125         HIF_ABORTED             = 9,
 126         HIF_WAIT                = 10,
 127 };
 128
 129 struct gfs2_holder {
 130         struct list_head gh_list;
 131
 132         struct gfs2_glock *gh_gl;
 133         struct task_struct *gh_owner;
 134         unsigned int gh_state;
 135         unsigned gh_flags;
 136
 137         int gh_error;
 138         unsigned long gh_iflags;
 139         unsigned long gh_ip;
 140 };
 141
 142 enum {
 143         GLF_LOCK                = 1,
 144         GLF_STICKY              = 2,
 145         GLF_DIRTY               = 5,
 146         GLF_SKIP_WAITERS2       = 6,
 147 };
 148
 149 struct gfs2_glock {
 150         struct hlist_node gl_list;
 151         unsigned long gl_flags;         /* GLF_... */
 152         struct lm_lockname gl_name;
 153         atomic_t gl_ref;
 154
 155         spinlock_t gl_spin;
 156
 157         unsigned int gl_state;
 158         unsigned int gl_hash;
 159         struct task_struct *gl_owner;
 160         unsigned long gl_ip;
 161         struct list_head gl_holders;
 162         struct list_head gl_waiters1;   /* HIF_MUTEX */
 163         struct list_head gl_waiters2;   /* HIF_DEMOTE */
 164         struct list_head gl_waiters3;   /* HIF_PROMOTE */
 165
 166         const struct gfs2_glock_operations *gl_ops;
 167
 168         struct gfs2_holder *gl_req_gh;
 169         gfs2_glop_bh_t gl_req_bh;
 170
 171         void *gl_lock;
 172         char *gl_lvb;
 173         atomic_t gl_lvb_count;
 174
 175         u64 gl_vn;
 176         unsigned long gl_stamp;
 177         void *gl_object;
 178
 179         struct list_head gl_reclaim;
 180
 181         struct gfs2_sbd *gl_sbd;
 182
 183         struct inode *gl_aspace;
 184         struct gfs2_log_element gl_le;
 185         struct list_head gl_ail_list;
 186         atomic_t gl_ail_count;
 187 };
 188
 189 struct gfs2_alloc {
 190         /* Quota stuff */
 191
 192         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 193         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 194         unsigned int al_qd_num;
 195
 196         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 197         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 198
 199         /* Filled in by gfs2_inplace_reserve() */
 200
 201         unsigned int al_line;
 202         char *al_file;
 203         struct gfs2_holder al_ri_gh;
 204         struct gfs2_holder al_rgd_gh;
 205         struct gfs2_rgrpd *al_rgd;
 206
 207 };
 208
 209 enum {
 210         GIF_INVALID             = 0,
 211         GIF_QD_LOCKED           = 1,
 212         GIF_PAGED               = 2,
 213         GIF_SW_PAGED            = 3,
 214 };
 215
 216 struct gfs2_inode {
 217         struct inode i_inode;
 218         struct gfs2_inum_host i_num;
 219
 220         unsigned long i_flags;          /* GIF_... */
 221
 222         struct gfs2_dinode_host i_di; /* To be replaced by ref to block */
 223
 224         struct gfs2_glock *i_gl; /* Move into i_gh? */
 225         struct gfs2_holder i_iopen_gh;
 226         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 227         struct gfs2_alloc i_alloc;
 228         u64 i_last_rg_alloc;
 229
 230         spinlock_t i_spin;
 231         struct rw_semaphore i_rw_mutex;
 232         unsigned long i_last_pfault;
 233
 234         struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 235 };
 236
 237 /*
 238  * Since i_inode is the first element of struct gfs2_inode,
 239  * this is effectively a cast.
 240  */
 241 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 242 {
 243         return container_of(inode, struct gfs2_inode, i_inode);
 244 }
 245
 246 /* To be removed? */
 247 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 248 {
 249         return inode->i_sb->s_fs_info;
 250 }
 251
 252 enum {
 253         GFF_DID_DIRECT_ALLOC    = 0,
 254         GFF_EXLOCK = 1,
 255 };
 256
 257 struct gfs2_file {
 258         unsigned long f_flags;          /* GFF_... */
 259         struct mutex f_fl_mutex;
 260         struct gfs2_holder f_fl_gh;
 261 };
 262
 263 struct gfs2_revoke {
 264         struct gfs2_log_element rv_le;
 265         u64 rv_blkno;
 266 };
 267
 268 struct gfs2_revoke_replay {
 269         struct list_head rr_list;
 270         u64 rr_blkno;
 271         unsigned int rr_where;
 272 };
 273
 274 enum {
 275         QDF_USER                = 0,
 276         QDF_CHANGE              = 1,
 277         QDF_LOCKED              = 2,
 278 };
 279
 280 struct gfs2_quota_lvb {
 281         __be32 qb_magic;
 282         u32 __pad;
 283         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 284         __be64 qb_warn;       /* Warn user when alloc is above this # */
 285         __be64 qb_value;       /* Current # blocks allocated */
 286 };
 287
 288 struct gfs2_quota_data {
 289         struct list_head qd_list;
 290         unsigned int qd_count;
 291
 292         u32 qd_id;
 293         unsigned long qd_flags;         /* QDF_... */
 294
 295         s64 qd_change;
 296         s64 qd_change_sync;
 297
 298         unsigned int qd_slot;
 299         unsigned int qd_slot_count;
 300
 301         struct buffer_head *qd_bh;
 302         struct gfs2_quota_change *qd_bh_qc;
 303         unsigned int qd_bh_count;
 304
 305         struct gfs2_glock *qd_gl;
 306         struct gfs2_quota_lvb qd_qb;
 307
 308         u64 qd_sync_gen;
 309         unsigned long qd_last_warn;
 310         unsigned long qd_last_touched;
 311 };
 312
 313 struct gfs2_log_buf {
 314         struct list_head lb_list;
 315         struct buffer_head *lb_bh;
 316         struct buffer_head *lb_real;
 317 };
 318
 319 struct gfs2_trans {
 320         unsigned long tr_ip;
 321
 322         unsigned int tr_blocks;
 323         unsigned int tr_revokes;
 324         unsigned int tr_reserved;
 325
 326         struct gfs2_holder tr_t_gh;
 327
 328         int tr_touched;
 329
 330         unsigned int tr_num_buf;
 331         unsigned int tr_num_buf_new;
 332         unsigned int tr_num_buf_rm;
 333         struct list_head tr_list_buf;
 334
 335         unsigned int tr_num_revoke;
 336         unsigned int tr_num_revoke_rm;
 337 };
 338
 339 struct gfs2_ail {
 340         struct list_head ai_list;
 341
 342         unsigned int ai_first;
 343         struct list_head ai_ail1_list;
 344         struct list_head ai_ail2_list;
 345
 346         u64 ai_sync_gen;
 347 };
 348
 349 struct gfs2_jdesc {
 350         struct list_head jd_list;
 351
 352         struct inode *jd_inode;
 353         unsigned int jd_jid;
 354         int jd_dirty;
 355
 356         unsigned int jd_blocks;
 357 };
 358
 359 #define GFS2_GLOCKD_DEFAULT     1
 360 #define GFS2_GLOCKD_MAX         16
 361
 362 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 363 #define GFS2_QUOTA_OFF          0
 364 #define GFS2_QUOTA_ACCOUNT      1
 365 #define GFS2_QUOTA_ON           2
 366
 367 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 368 #define GFS2_DATA_WRITEBACK     1
 369 #define GFS2_DATA_ORDERED       2
 370
 371 struct gfs2_args {
 372         char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
 373         char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
 374         char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
 375         int ar_spectator; /* Don't get a journal because we're always RO */
 376         int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */
 377         int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */
 378         int ar_localcaching; /* Local-style caching (dangerous on multihost) */
 379         int ar_debug; /* Oops on errors instead of trying to be graceful */
 380         int ar_upgrade; /* Upgrade ondisk/multihost format */
 381         unsigned int ar_num_glockd; /* Number of glockd threads */
 382         int ar_posix_acl; /* Enable posix acls */
 383         int ar_quota; /* off/account/on */
 384         int ar_suiddir; /* suiddir support */
 385         int ar_data; /* ordered/writeback */
 386 };
 387
 388 struct gfs2_tune {
 389         spinlock_t gt_spin;
 390
 391         unsigned int gt_ilimit;
 392         unsigned int gt_ilimit_tries;
 393         unsigned int gt_ilimit_min;
 394         unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 395         unsigned int gt_incore_log_blocks;
 396         unsigned int gt_log_flush_secs;
 397         unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 398
 399         unsigned int gt_scand_secs;
 400         unsigned int gt_recoverd_secs;
 401         unsigned int gt_logd_secs;
 402         unsigned int gt_quotad_secs;
 403
 404         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 405         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 406         unsigned int gt_quota_scale_num; /* Numerator */
 407         unsigned int gt_quota_scale_den; /* Denominator */
 408         unsigned int gt_quota_cache_secs;
 409         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 410         unsigned int gt_atime_quantum; /* Min secs between atime updates */
 411         unsigned int gt_new_files_jdata;
 412         unsigned int gt_new_files_directio;
 413         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 414         unsigned int gt_lockdump_size;
 415         unsigned int gt_stall_secs; /* Detects trouble! */
 416         unsigned int gt_complain_secs;
 417         unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 418         unsigned int gt_statfs_quantum;
 419         unsigned int gt_statfs_slow;
 420 };
 421
 422 enum {
 423         SDF_JOURNAL_CHECKED     = 0,
 424         SDF_JOURNAL_LIVE        = 1,
 425         SDF_SHUTDOWN            = 2,
 426         SDF_NOATIME             = 3,
 427 };
 428
 429 #define GFS2_FSNAME_LEN         256
 430
 431 struct gfs2_sbd {
 432         struct super_block *sd_vfs;
 433         struct super_block *sd_vfs_meta;
 434         struct kobject sd_kobj;
 435         unsigned long sd_flags; /* SDF_... */
 436         struct gfs2_sb_host sd_sb;
 437
 438         /* Constants computed on mount */
 439
 440         u32 sd_fsb2bb;
 441         u32 sd_fsb2bb_shift;
 442         u32 sd_diptrs;  /* Number of pointers in a dinode */
 443         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 444         u32 sd_jbsize;  /* Size of a journaled data block */
 445         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 446         u32 sd_hash_bsize_shift;
 447         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 448         u32 sd_qc_per_block;
 449         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 450         u32 sd_max_height;      /* Max height of a file's metadata tree */
 451         u64 sd_heightsize[GFS2_MAX_META_HEIGHT];
 452         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 453         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT];
 454
 455         struct gfs2_args sd_args;       /* Mount arguments */
 456         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 457
 458         /* Lock Stuff */
 459
 460         struct lm_lockstruct sd_lockstruct;
 461         struct list_head sd_reclaim_list;
 462         spinlock_t sd_reclaim_lock;
 463         wait_queue_head_t sd_reclaim_wq;
 464         atomic_t sd_reclaim_count;
 465         struct gfs2_holder sd_live_gh;
 466         struct gfs2_glock *sd_rename_gl;
 467         struct gfs2_glock *sd_trans_gl;
 468
 469         /* Inode Stuff */
 470
 471         struct inode *sd_master_dir;
 472         struct inode *sd_jindex;
 473         struct inode *sd_inum_inode;
 474         struct inode *sd_statfs_inode;
 475         struct inode *sd_ir_inode;
 476         struct inode *sd_sc_inode;
 477         struct inode *sd_qc_inode;
 478         struct inode *sd_rindex;
 479         struct inode *sd_quota_inode;
 480
 481         /* Inum stuff */
 482
 483         struct mutex sd_inum_mutex;
 484
 485         /* StatFS stuff */
 486
 487         spinlock_t sd_statfs_spin;
 488         struct mutex sd_statfs_mutex;
 489         struct gfs2_statfs_change_host sd_statfs_master;
 490         struct gfs2_statfs_change_host sd_statfs_local;
 491         unsigned long sd_statfs_sync_time;
 492
 493         /* Resource group stuff */
 494
 495         u64 sd_rindex_vn;
 496         spinlock_t sd_rindex_spin;
 497         struct mutex sd_rindex_mutex;
 498         struct list_head sd_rindex_list;
 499         struct list_head sd_rindex_mru_list;
 500         struct list_head sd_rindex_recent_list;
 501         struct gfs2_rgrpd *sd_rindex_forward;
 502         unsigned int sd_rgrps;
 503
 504         /* Journal index stuff */
 505
 506         struct list_head sd_jindex_list;
 507         spinlock_t sd_jindex_spin;
 508         struct mutex sd_jindex_mutex;
 509         unsigned int sd_journals;
 510         unsigned long sd_jindex_refresh_time;
 511
 512         struct gfs2_jdesc *sd_jdesc;
 513         struct gfs2_holder sd_journal_gh;
 514         struct gfs2_holder sd_jinode_gh;
 515
 516         struct gfs2_holder sd_ir_gh;
 517         struct gfs2_holder sd_sc_gh;
 518         struct gfs2_holder sd_qc_gh;
 519
 520         /* Daemon stuff */
 521
 522         struct task_struct *sd_scand_process;
 523         struct task_struct *sd_recoverd_process;
 524         struct task_struct *sd_logd_process;
 525         struct task_struct *sd_quotad_process;
 526         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 527         unsigned int sd_glockd_num;
 528
 529         /* Quota stuff */
 530
 531         struct list_head sd_quota_list;
 532         atomic_t sd_quota_count;
 533         spinlock_t sd_quota_spin;
 534         struct mutex sd_quota_mutex;
 535
 536         unsigned int sd_quota_slots;
 537         unsigned int sd_quota_chunks;
 538         unsigned char **sd_quota_bitmap;
 539
 540         u64 sd_quota_sync_gen;
 541         unsigned long sd_quota_sync_time;
 542
 543         /* Log stuff */
 544
 545         spinlock_t sd_log_lock;
 546
 547         unsigned int sd_log_blks_reserved;
 548         unsigned int sd_log_commited_buf;
 549         unsigned int sd_log_commited_revoke;
 550
 551         unsigned int sd_log_num_gl;
 552         unsigned int sd_log_num_buf;
 553         unsigned int sd_log_num_revoke;
 554         unsigned int sd_log_num_rg;
 555         unsigned int sd_log_num_databuf;
 556         unsigned int sd_log_num_jdata;
 557         unsigned int sd_log_num_hdrs;
 558
 559         struct list_head sd_log_le_gl;
 560         struct list_head sd_log_le_buf;
 561         struct list_head sd_log_le_revoke;
 562         struct list_head sd_log_le_rg;
 563         struct list_head sd_log_le_databuf;
 564
 565         unsigned int sd_log_blks_free;
 566         struct mutex sd_log_reserve_mutex;
 567
 568         u64 sd_log_sequence;
 569         unsigned int sd_log_head;
 570         unsigned int sd_log_tail;
 571         int sd_log_idle;
 572
 573         unsigned long sd_log_flush_time;
 574         struct rw_semaphore sd_log_flush_lock;
 575         struct list_head sd_log_flush_list;
 576
 577         unsigned int sd_log_flush_head;
 578         u64 sd_log_flush_wrapped;
 579
 580         struct list_head sd_ail1_list;
 581         struct list_head sd_ail2_list;
 582         u64 sd_ail_sync_gen;
 583
 584         /* Replay stuff */
 585
 586         struct list_head sd_revoke_list;
 587         unsigned int sd_replay_tail;
 588
 589         unsigned int sd_found_blocks;
 590         unsigned int sd_found_revokes;
 591         unsigned int sd_replayed_blocks;
 592
 593         /* For quiescing the filesystem */
 594
 595         struct gfs2_holder sd_freeze_gh;
 596         struct mutex sd_freeze_lock;
 597         unsigned int sd_freeze_count;
 598
 599         /* Counters */
 600
 601         atomic_t sd_glock_count;
 602         atomic_t sd_glock_held_count;
 603         atomic_t sd_inode_count;
 604         atomic_t sd_reclaimed;
 605
 606         char sd_fsname[GFS2_FSNAME_LEN];
 607         char sd_table_name[GFS2_FSNAME_LEN];
 608         char sd_proto_name[GFS2_FSNAME_LEN];
 609
 610         /* Debugging crud */
 611
 612         unsigned long sd_last_warning;
 613         struct vfsmount *sd_gfs2mnt;
 614         struct dentry *debugfs_dentry; /* for debugfs */
 615 };
 616
 617 #endif /* __INCORE_DOT_H__ */
 618