fs/gfs2/incore.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 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 #include <linux/workqueue.h>
  15
  16 #define DIO_WAIT        0x00000010
  17 #define DIO_METADATA    0x00000020
  18 #define DIO_ALL         0x00000100
  19
  20 struct gfs2_log_operations;
  21 struct gfs2_log_element;
  22 struct gfs2_holder;
  23 struct gfs2_glock;
  24 struct gfs2_quota_data;
  25 struct gfs2_trans;
  26 struct gfs2_ail;
  27 struct gfs2_jdesc;
  28 struct gfs2_sbd;
  29
  30 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  31
  32 struct gfs2_log_header_host {
  33         u64 lh_sequence;        /* Sequence number of this transaction */
  34         u32 lh_flags;           /* GFS2_LOG_HEAD_... */
  35         u32 lh_tail;            /* Block number of log tail */
  36         u32 lh_blkno;
  37         u32 lh_hash;
  38 };
  39
  40 /*
  41  * Structure of operations that are associated with each
  42  * type of element in the log.
  43  */
  44
  45 struct gfs2_log_operations {
  46         void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
  47         void (*lo_before_commit) (struct gfs2_sbd *sdp);
  48         void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
  49         void (*lo_before_scan) (struct gfs2_jdesc *jd,
  50                                 struct gfs2_log_header_host *head, int pass);
  51         int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  52                                  struct gfs2_log_descriptor *ld, __be64 *ptr,
  53                                  int pass);
  54         void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  55         const char *lo_name;
  56 };
  57
  58 struct gfs2_log_element {
  59         struct list_head le_list;
  60         const struct gfs2_log_operations *le_ops;
  61 };
  62
  63 struct gfs2_bitmap {
  64         struct buffer_head *bi_bh;
  65         char *bi_clone;
  66         u32 bi_offset;
  67         u32 bi_start;
  68         u32 bi_len;
  69 };
  70
  71 struct gfs2_rgrp_host {
  72         u32 rg_free;
  73         u32 rg_dinodes;
  74         u64 rg_igeneration;
  75 };
  76
  77 struct gfs2_rgrpd {
  78         struct list_head rd_list;       /* Link with superblock */
  79         struct list_head rd_list_mru;
  80         struct gfs2_glock *rd_gl;       /* Glock for this rgrp */
  81         u64 rd_addr;                    /* grp block disk address */
  82         u64 rd_data0;                   /* first data location */
  83         u32 rd_length;                  /* length of rgrp header in fs blocks */
  84         u32 rd_data;                    /* num of data blocks in rgrp */
  85         u32 rd_bitbytes;                /* number of bytes in data bitmaps */
  86         struct gfs2_rgrp_host rd_rg;
  87         struct gfs2_bitmap *rd_bits;
  88         unsigned int rd_bh_count;
  89         struct mutex rd_mutex;
  90         u32 rd_free_clone;
  91         struct gfs2_log_element rd_le;
  92         u32 rd_last_alloc;
  93         struct gfs2_sbd *rd_sbd;
  94         unsigned char rd_flags;
  95 #define GFS2_RDF_CHECK        0x01      /* Need to check for unlinked inodes */
  96 #define GFS2_RDF_NOALLOC      0x02      /* rg prohibits allocation */
  97 #define GFS2_RDF_UPTODATE     0x04      /* rg is up to date */
  98 };
  99
 100 enum gfs2_state_bits {
 101         BH_Pinned = BH_PrivateStart,
 102         BH_Escaped = BH_PrivateStart + 1,
 103 };
 104
 105 BUFFER_FNS(Pinned, pinned)
 106 TAS_BUFFER_FNS(Pinned, pinned)
 107 BUFFER_FNS(Escaped, escaped)
 108 TAS_BUFFER_FNS(Escaped, escaped)
 109
 110 struct gfs2_bufdata {
 111         struct buffer_head *bd_bh;
 112         struct gfs2_glock *bd_gl;
 113
 114         union {
 115                 struct list_head list_tr;
 116                 u64 blkno;
 117         } u;
 118 #define bd_list_tr u.list_tr
 119 #define bd_blkno u.blkno
 120
 121         struct gfs2_log_element bd_le;
 122
 123         struct gfs2_ail *bd_ail;
 124         struct list_head bd_ail_st_list;
 125         struct list_head bd_ail_gl_list;
 126 };
 127
 128 struct gfs2_glock_operations {
 129         void (*go_xmote_th) (struct gfs2_glock *gl);
 130         int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
 131         void (*go_inval) (struct gfs2_glock *gl, int flags);
 132         int (*go_demote_ok) (struct gfs2_glock *gl);
 133         int (*go_lock) (struct gfs2_holder *gh);
 134         void (*go_unlock) (struct gfs2_holder *gh);
 135         int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
 136         const int go_type;
 137         const unsigned long go_min_hold_time;
 138 };
 139
 140 enum {
 141         /* States */
 142         HIF_HOLDER              = 6,  /* Set for gh that "holds" the glock */
 143         HIF_FIRST               = 7,
 144         HIF_WAIT                = 10,
 145 };
 146
 147 struct gfs2_holder {
 148         struct list_head gh_list;
 149
 150         struct gfs2_glock *gh_gl;
 151         struct pid *gh_owner_pid;
 152         unsigned int gh_state;
 153         unsigned gh_flags;
 154
 155         int gh_error;
 156         unsigned long gh_iflags; /* HIF_... */
 157         unsigned long gh_ip;
 158 };
 159
 160 enum {
 161         GLF_LOCK                        = 1,
 162         GLF_STICKY                      = 2,
 163         GLF_DEMOTE                      = 3,
 164         GLF_PENDING_DEMOTE              = 4,
 165         GLF_DEMOTE_IN_PROGRESS          = 5,
 166         GLF_DIRTY                       = 6,
 167         GLF_LFLUSH                      = 7,
 168         GLF_INVALIDATE_IN_PROGRESS      = 8,
 169         GLF_REPLY_PENDING               = 9,
 170 };
 171
 172 struct gfs2_glock {
 173         struct hlist_node gl_list;
 174         unsigned long gl_flags;         /* GLF_... */
 175         struct lm_lockname gl_name;
 176         atomic_t gl_ref;
 177
 178         spinlock_t gl_spin;
 179
 180         unsigned int gl_state;
 181         unsigned int gl_target;
 182         unsigned int gl_reply;
 183         unsigned int gl_hash;
 184         unsigned int gl_demote_state; /* state requested by remote node */
 185         unsigned long gl_demote_time; /* time of first demote request */
 186         struct list_head gl_holders;
 187
 188         const struct gfs2_glock_operations *gl_ops;
 189         void *gl_lock;
 190         char *gl_lvb;
 191         atomic_t gl_lvb_count;
 192
 193         unsigned long gl_stamp;
 194         unsigned long gl_tchange;
 195         void *gl_object;
 196
 197         struct list_head gl_reclaim;
 198
 199         struct gfs2_sbd *gl_sbd;
 200
 201         struct inode *gl_aspace;
 202         struct list_head gl_ail_list;
 203         atomic_t gl_ail_count;
 204         struct delayed_work gl_work;
 205 };
 206
 207 #define GFS2_MIN_LVB_SIZE 32    /* Min size of LVB that gfs2 supports */
 208
 209 struct gfs2_alloc {
 210         /* Quota stuff */
 211
 212         struct gfs2_quota_data *al_qd[2*MAXQUOTAS];
 213         struct gfs2_holder al_qd_ghs[2*MAXQUOTAS];
 214         unsigned int al_qd_num;
 215
 216         u32 al_requested; /* Filled in by caller of gfs2_inplace_reserve() */
 217         u32 al_alloced; /* Filled in by gfs2_alloc_*() */
 218
 219         /* Filled in by gfs2_inplace_reserve() */
 220
 221         unsigned int al_line;
 222         char *al_file;
 223         struct gfs2_holder al_ri_gh;
 224         struct gfs2_holder al_rgd_gh;
 225         struct gfs2_rgrpd *al_rgd;
 226
 227 };
 228
 229 enum {
 230         GIF_INVALID             = 0,
 231         GIF_QD_LOCKED           = 1,
 232         GIF_SW_PAGED            = 3,
 233         GIF_USER                = 4, /* user inode, not metadata addr space */
 234 };
 235
 236 struct gfs2_dinode_host {
 237         u64 di_size;            /* number of bytes in file */
 238         u64 di_generation;      /* generation number for NFS */
 239         u32 di_flags;           /* GFS2_DIF_... */
 240         /* These only apply to directories  */
 241         u32 di_entries;         /* The number of entries in the directory */
 242         u64 di_eattr;           /* extended attribute block number */
 243 };
 244
 245 struct gfs2_inode {
 246         struct inode i_inode;
 247         u64 i_no_addr;
 248         u64 i_no_formal_ino;
 249         unsigned long i_flags;          /* GIF_... */
 250
 251         struct gfs2_dinode_host i_di; /* To be replaced by ref to block */
 252
 253         struct gfs2_glock *i_gl; /* Move into i_gh? */
 254         struct gfs2_holder i_iopen_gh;
 255         struct gfs2_holder i_gh; /* for prepare/commit_write only */
 256         struct gfs2_alloc *i_alloc;
 257         u64 i_goal;     /* goal block for allocations */
 258         struct rw_semaphore i_rw_mutex;
 259         u8 i_height;
 260         u8 i_depth;
 261 };
 262
 263 /*
 264  * Since i_inode is the first element of struct gfs2_inode,
 265  * this is effectively a cast.
 266  */
 267 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 268 {
 269         return container_of(inode, struct gfs2_inode, i_inode);
 270 }
 271
 272 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 273 {
 274         return inode->i_sb->s_fs_info;
 275 }
 276
 277 struct gfs2_file {
 278         struct mutex f_fl_mutex;
 279         struct gfs2_holder f_fl_gh;
 280 };
 281
 282 struct gfs2_revoke_replay {
 283         struct list_head rr_list;
 284         u64 rr_blkno;
 285         unsigned int rr_where;
 286 };
 287
 288 enum {
 289         QDF_USER                = 0,
 290         QDF_CHANGE              = 1,
 291         QDF_LOCKED              = 2,
 292 };
 293
 294 struct gfs2_quota_data {
 295         struct list_head qd_list;
 296         unsigned int qd_count;
 297
 298         u32 qd_id;
 299         unsigned long qd_flags;         /* QDF_... */
 300
 301         s64 qd_change;
 302         s64 qd_change_sync;
 303
 304         unsigned int qd_slot;
 305         unsigned int qd_slot_count;
 306
 307         struct buffer_head *qd_bh;
 308         struct gfs2_quota_change *qd_bh_qc;
 309         unsigned int qd_bh_count;
 310
 311         struct gfs2_glock *qd_gl;
 312         struct gfs2_quota_lvb qd_qb;
 313
 314         u64 qd_sync_gen;
 315         unsigned long qd_last_warn;
 316         unsigned long qd_last_touched;
 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_databuf_new;
 333         unsigned int tr_num_buf_rm;
 334         unsigned int tr_num_databuf_rm;
 335         struct list_head tr_list_buf;
 336
 337         unsigned int tr_num_revoke;
 338         unsigned int tr_num_revoke_rm;
 339 };
 340
 341 struct gfs2_ail {
 342         struct list_head ai_list;
 343
 344         unsigned int ai_first;
 345         struct list_head ai_ail1_list;
 346         struct list_head ai_ail2_list;
 347
 348         u64 ai_sync_gen;
 349 };
 350
 351 struct gfs2_journal_extent {
 352         struct list_head extent_list;
 353
 354         unsigned int lblock; /* First logical block */
 355         u64 dblock; /* First disk block */
 356         u64 blocks;
 357 };
 358
 359 struct gfs2_jdesc {
 360         struct list_head jd_list;
 361         struct list_head extent_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 struct gfs2_statfs_change_host {
 371         s64 sc_total;
 372         s64 sc_free;
 373         s64 sc_dinodes;
 374 };
 375
 376 #define GFS2_GLOCKD_DEFAULT     1
 377 #define GFS2_GLOCKD_MAX         16
 378
 379 #define GFS2_QUOTA_DEFAULT      GFS2_QUOTA_OFF
 380 #define GFS2_QUOTA_OFF          0
 381 #define GFS2_QUOTA_ACCOUNT      1
 382 #define GFS2_QUOTA_ON           2
 383
 384 #define GFS2_DATA_DEFAULT       GFS2_DATA_ORDERED
 385 #define GFS2_DATA_WRITEBACK     1
 386 #define GFS2_DATA_ORDERED       2
 387
 388 struct gfs2_args {
 389         char ar_lockproto[GFS2_LOCKNAME_LEN];   /* Name of the Lock Protocol */
 390         char ar_locktable[GFS2_LOCKNAME_LEN];   /* Name of the Lock Table */
 391         char ar_hostdata[GFS2_LOCKNAME_LEN];    /* Host specific data */
 392         unsigned int ar_spectator:1;            /* Don't get a journal */
 393         unsigned int ar_ignore_local_fs:1;      /* Ignore optimisations */
 394         unsigned int ar_localflocks:1;          /* Let the VFS do flock|fcntl */
 395         unsigned int ar_localcaching:1;         /* Local caching */
 396         unsigned int ar_debug:1;                /* Oops on errors */
 397         unsigned int ar_upgrade:1;              /* Upgrade ondisk format */
 398         unsigned int ar_posix_acl:1;            /* Enable posix acls */
 399         unsigned int ar_quota:2;                /* off/account/on */
 400         unsigned int ar_suiddir:1;              /* suiddir support */
 401         unsigned int ar_data:2;                 /* ordered/writeback */
 402         unsigned int ar_meta:1;                 /* mount metafs */
 403         unsigned int ar_num_glockd;             /* Number of glockd threads */
 404 };
 405
 406 struct gfs2_tune {
 407         spinlock_t gt_spin;
 408
 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
 413         unsigned int gt_recoverd_secs;
 414         unsigned int gt_logd_secs;
 415         unsigned int gt_quotad_secs;
 416
 417         unsigned int gt_quota_simul_sync; /* Max quotavals to sync at once */
 418         unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
 419         unsigned int gt_quota_scale_num; /* Numerator */
 420         unsigned int gt_quota_scale_den; /* Denominator */
 421         unsigned int gt_quota_cache_secs;
 422         unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 423         unsigned int gt_new_files_jdata;
 424         unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 425         unsigned int gt_stall_secs; /* Detects trouble! */
 426         unsigned int gt_complain_secs;
 427         unsigned int gt_statfs_quantum;
 428         unsigned int gt_statfs_slow;
 429 };
 430
 431 enum {
 432         SDF_JOURNAL_CHECKED     = 0,
 433         SDF_JOURNAL_LIVE        = 1,
 434         SDF_SHUTDOWN            = 2,
 435         SDF_NOBARRIERS          = 3,
 436 };
 437
 438 #define GFS2_FSNAME_LEN         256
 439
 440 struct gfs2_inum_host {
 441         u64 no_formal_ino;
 442         u64 no_addr;
 443 };
 444
 445 struct gfs2_sb_host {
 446         u32 sb_magic;
 447         u32 sb_type;
 448         u32 sb_format;
 449
 450         u32 sb_fs_format;
 451         u32 sb_multihost_format;
 452         u32 sb_bsize;
 453         u32 sb_bsize_shift;
 454
 455         struct gfs2_inum_host sb_master_dir;
 456         struct gfs2_inum_host sb_root_dir;
 457
 458         char sb_lockproto[GFS2_LOCKNAME_LEN];
 459         char sb_locktable[GFS2_LOCKNAME_LEN];
 460 };
 461
 462 struct gfs2_sbd {
 463         struct super_block *sd_vfs;
 464         struct kobject sd_kobj;
 465         unsigned long sd_flags; /* SDF_... */
 466         struct gfs2_sb_host sd_sb;
 467
 468         /* Constants computed on mount */
 469
 470         u32 sd_fsb2bb;
 471         u32 sd_fsb2bb_shift;
 472         u32 sd_diptrs;  /* Number of pointers in a dinode */
 473         u32 sd_inptrs;  /* Number of pointers in a indirect block */
 474         u32 sd_jbsize;  /* Size of a journaled data block */
 475         u32 sd_hash_bsize;      /* sizeof(exhash block) */
 476         u32 sd_hash_bsize_shift;
 477         u32 sd_hash_ptrs;       /* Number of pointers in a hash block */
 478         u32 sd_qc_per_block;
 479         u32 sd_max_dirres;      /* Max blocks needed to add a directory entry */
 480         u32 sd_max_height;      /* Max height of a file's metadata tree */
 481         u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
 482         u32 sd_max_jheight; /* Max height of journaled file's meta tree */
 483         u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];
 484
 485         struct gfs2_args sd_args;       /* Mount arguments */
 486         struct gfs2_tune sd_tune;       /* Filesystem tuning structure */
 487
 488         /* Lock Stuff */
 489
 490         struct lm_lockstruct sd_lockstruct;
 491         struct list_head sd_reclaim_list;
 492         spinlock_t sd_reclaim_lock;
 493         wait_queue_head_t sd_reclaim_wq;
 494         atomic_t sd_reclaim_count;
 495         struct gfs2_holder sd_live_gh;
 496         struct gfs2_glock *sd_rename_gl;
 497         struct gfs2_glock *sd_trans_gl;
 498
 499         /* Inode Stuff */
 500
 501         struct dentry *sd_master_dir;
 502         struct dentry *sd_root_dir;
 503
 504         struct inode *sd_jindex;
 505         struct inode *sd_inum_inode;
 506         struct inode *sd_statfs_inode;
 507         struct inode *sd_ir_inode;
 508         struct inode *sd_sc_inode;
 509         struct inode *sd_qc_inode;
 510         struct inode *sd_rindex;
 511         struct inode *sd_quota_inode;
 512
 513         /* Inum stuff */
 514
 515         struct mutex sd_inum_mutex;
 516
 517         /* StatFS stuff */
 518
 519         spinlock_t sd_statfs_spin;
 520         struct gfs2_statfs_change_host sd_statfs_master;
 521         struct gfs2_statfs_change_host sd_statfs_local;
 522         unsigned long sd_statfs_sync_time;
 523
 524         /* Resource group stuff */
 525
 526         int sd_rindex_uptodate;
 527         spinlock_t sd_rindex_spin;
 528         struct mutex sd_rindex_mutex;
 529         struct list_head sd_rindex_list;
 530         struct list_head sd_rindex_mru_list;
 531         struct gfs2_rgrpd *sd_rindex_forward;
 532         unsigned int sd_rgrps;
 533
 534         /* Journal index stuff */
 535
 536         struct list_head sd_jindex_list;
 537         spinlock_t sd_jindex_spin;
 538         struct mutex sd_jindex_mutex;
 539         unsigned int sd_journals;
 540         unsigned long sd_jindex_refresh_time;
 541
 542         struct gfs2_jdesc *sd_jdesc;
 543         struct gfs2_holder sd_journal_gh;
 544         struct gfs2_holder sd_jinode_gh;
 545
 546         struct gfs2_holder sd_ir_gh;
 547         struct gfs2_holder sd_sc_gh;
 548         struct gfs2_holder sd_qc_gh;
 549
 550         /* Daemon stuff */
 551
 552         struct task_struct *sd_recoverd_process;
 553         struct task_struct *sd_logd_process;
 554         struct task_struct *sd_quotad_process;
 555         struct task_struct *sd_glockd_process[GFS2_GLOCKD_MAX];
 556         unsigned int sd_glockd_num;
 557
 558         /* Quota stuff */
 559
 560         struct list_head sd_quota_list;
 561         atomic_t sd_quota_count;
 562         spinlock_t sd_quota_spin;
 563         struct mutex sd_quota_mutex;
 564
 565         unsigned int sd_quota_slots;
 566         unsigned int sd_quota_chunks;
 567         unsigned char **sd_quota_bitmap;
 568
 569         u64 sd_quota_sync_gen;
 570         unsigned long sd_quota_sync_time;
 571
 572         /* Log stuff */
 573
 574         spinlock_t sd_log_lock;
 575
 576         unsigned int sd_log_blks_reserved;
 577         unsigned int sd_log_commited_buf;
 578         unsigned int sd_log_commited_databuf;
 579         unsigned int sd_log_commited_revoke;
 580
 581         unsigned int sd_log_num_buf;
 582         unsigned int sd_log_num_revoke;
 583         unsigned int sd_log_num_rg;
 584         unsigned int sd_log_num_databuf;
 585
 586         struct list_head sd_log_le_buf;
 587         struct list_head sd_log_le_revoke;
 588         struct list_head sd_log_le_rg;
 589         struct list_head sd_log_le_databuf;
 590         struct list_head sd_log_le_ordered;
 591
 592         atomic_t sd_log_blks_free;
 593         struct mutex sd_log_reserve_mutex;
 594
 595         u64 sd_log_sequence;
 596         unsigned int sd_log_head;
 597         unsigned int sd_log_tail;
 598         int sd_log_idle;
 599
 600         unsigned long sd_log_flush_time;
 601         struct rw_semaphore sd_log_flush_lock;
 602         atomic_t sd_log_in_flight;
 603         wait_queue_head_t sd_log_flush_wait;
 604
 605         unsigned int sd_log_flush_head;
 606         u64 sd_log_flush_wrapped;
 607
 608         struct list_head sd_ail1_list;
 609         struct list_head sd_ail2_list;
 610         u64 sd_ail_sync_gen;
 611
 612         /* Replay stuff */
 613
 614         struct list_head sd_revoke_list;
 615         unsigned int sd_replay_tail;
 616
 617         unsigned int sd_found_blocks;
 618         unsigned int sd_found_revokes;
 619         unsigned int sd_replayed_blocks;
 620
 621         /* For quiescing the filesystem */
 622
 623         struct gfs2_holder sd_freeze_gh;
 624         struct mutex sd_freeze_lock;
 625         unsigned int sd_freeze_count;
 626
 627         /* Counters */
 628
 629         atomic_t sd_reclaimed;
 630
 631         char sd_fsname[GFS2_FSNAME_LEN];
 632         char sd_table_name[GFS2_FSNAME_LEN];
 633         char sd_proto_name[GFS2_FSNAME_LEN];
 634
 635         /* Debugging crud */
 636
 637         unsigned long sd_last_warning;
 638         struct dentry *debugfs_dir;    /* debugfs directory */
 639         struct dentry *debugfs_dentry_glocks; /* for debugfs */
 640 };
 641
 642 #endif /* __INCORE_DOT_H__ */
 643