fs/ocfs2/ocfs2.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * ocfs2.h
   5  *
   6  * Defines macros and structures used in OCFS2
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #ifndef OCFS2_H
  27 #define OCFS2_H
  28
  29 #include <linux/spinlock.h>
  30 #include <linux/sched.h>
  31 #include <linux/wait.h>
  32 #include <linux/list.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/workqueue.h>
  35 #include <linux/kref.h>
  36 #include <linux/mutex.h>
  37 #include <linux/jbd.h>
  38
  39 #include "cluster/nodemanager.h"
  40 #include "cluster/heartbeat.h"
  41 #include "cluster/tcp.h"
  42
  43 #include "dlm/dlmapi.h"
  44
  45 #include "ocfs2_fs.h"
  46 #include "endian.h"
  47 #include "ocfs2_lockid.h"
  48
  49 /* Most user visible OCFS2 inodes will have very few pieces of
  50  * metadata, but larger files (including bitmaps, etc) must be taken
  51  * into account when designing an access scheme. We allow a small
  52  * amount of inlined blocks to be stored on an array and grow the
  53  * structure into a rb tree when necessary. */
  54 #define OCFS2_INODE_MAX_CACHE_ARRAY 2
  55
  56 struct ocfs2_caching_info {
  57         unsigned int            ci_num_cached;
  58         union {
  59                 sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
  60                 struct rb_root  ci_tree;
  61         } ci_cache;
  62 };
  63
  64 /* this limits us to 256 nodes
  65  * if we need more, we can do a kmalloc for the map */
  66 #define OCFS2_NODE_MAP_MAX_NODES    256
  67 struct ocfs2_node_map {
  68         u16 num_nodes;
  69         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
  70 };
  71
  72 enum ocfs2_ast_action {
  73         OCFS2_AST_INVALID = 0,
  74         OCFS2_AST_ATTACH,
  75         OCFS2_AST_CONVERT,
  76         OCFS2_AST_DOWNCONVERT,
  77 };
  78
  79 /* actions for an unlockast function to take. */
  80 enum ocfs2_unlock_action {
  81         OCFS2_UNLOCK_INVALID = 0,
  82         OCFS2_UNLOCK_CANCEL_CONVERT,
  83         OCFS2_UNLOCK_DROP_LOCK,
  84 };
  85
  86 /* ocfs2_lock_res->l_flags flags. */
  87 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
  88                                                * the lvb */
  89 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
  90                                                * dlm_lock */
  91 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
  92                                                * downconvert*/
  93 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
  94 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
  95 #define OCFS2_LOCK_REFRESHING    (0x00000020)
  96 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
  97                                                * for shutdown paths */
  98 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
  99                                                * when to skip queueing
 100                                                * a lock because it's
 101                                                * about to be
 102                                                * dropped. */
 103 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 104 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
 105
 106 struct ocfs2_lock_res_ops;
 107
 108 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 109
 110 struct ocfs2_lock_res {
 111         void                    *l_priv;
 112         struct ocfs2_lock_res_ops *l_ops;
 113         spinlock_t               l_lock;
 114
 115         struct list_head         l_blocked_list;
 116         struct list_head         l_mask_waiters;
 117
 118         enum ocfs2_lock_type     l_type;
 119         unsigned long            l_flags;
 120         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 121         int                      l_level;
 122         unsigned int             l_ro_holders;
 123         unsigned int             l_ex_holders;
 124         struct dlm_lockstatus    l_lksb;
 125
 126         /* used from AST/BAST funcs. */
 127         enum ocfs2_ast_action    l_action;
 128         enum ocfs2_unlock_action l_unlock_action;
 129         int                      l_requested;
 130         int                      l_blocking;
 131
 132         wait_queue_head_t        l_event;
 133
 134         struct list_head         l_debug_list;
 135 };
 136
 137 struct ocfs2_dlm_debug {
 138         struct kref d_refcnt;
 139         struct dentry *d_locking_state;
 140         struct list_head d_lockres_tracking;
 141 };
 142
 143 enum ocfs2_vol_state
 144 {
 145         VOLUME_INIT = 0,
 146         VOLUME_MOUNTED,
 147         VOLUME_DISMOUNTED,
 148         VOLUME_DISABLED
 149 };
 150
 151 struct ocfs2_alloc_stats
 152 {
 153         atomic_t moves;
 154         atomic_t local_data;
 155         atomic_t bitmap_data;
 156         atomic_t bg_allocs;
 157         atomic_t bg_extends;
 158 };
 159
 160 enum ocfs2_local_alloc_state
 161 {
 162         OCFS2_LA_UNUSED = 0,
 163         OCFS2_LA_ENABLED,
 164         OCFS2_LA_DISABLED
 165 };
 166
 167 enum ocfs2_mount_options
 168 {
 169         OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
 170         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
 171         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 172         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 173         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 174 };
 175
 176 #define OCFS2_OSB_SOFT_RO       0x0001
 177 #define OCFS2_OSB_HARD_RO       0x0002
 178 #define OCFS2_OSB_ERROR_FS      0x0004
 179 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
 180
 181 struct ocfs2_journal;
 182 struct ocfs2_super
 183 {
 184         struct task_struct *commit_task;
 185         struct super_block *sb;
 186         struct inode *root_inode;
 187         struct inode *sys_root_inode;
 188         struct inode *system_inodes[NUM_SYSTEM_INODES];
 189
 190         struct ocfs2_slot_info *slot_info;
 191
 192         spinlock_t node_map_lock;
 193         struct ocfs2_node_map recovery_map;
 194
 195         u64 root_blkno;
 196         u64 system_dir_blkno;
 197         u64 bitmap_blkno;
 198         u32 bitmap_cpg;
 199         u8 *uuid;
 200         char *uuid_str;
 201         u8 *vol_label;
 202         u64 first_cluster_group_blkno;
 203         u32 fs_generation;
 204
 205         u32 s_feature_compat;
 206         u32 s_feature_incompat;
 207         u32 s_feature_ro_compat;
 208
 209         /* Protects s_next_generaion, osb_flags. Could protect more on
 210          * osb as it's very short lived. */
 211         spinlock_t osb_lock;
 212         u32 s_next_generation;
 213         unsigned long osb_flags;
 214
 215         unsigned long s_mount_opt;
 216         unsigned int s_atime_quantum;
 217
 218         u16 max_slots;
 219         s16 node_num;
 220         s16 slot_num;
 221         s16 preferred_slot;
 222         int s_sectsize_bits;
 223         int s_clustersize;
 224         int s_clustersize_bits;
 225
 226         atomic_t vol_state;
 227         struct mutex recovery_lock;
 228         struct task_struct *recovery_thread_task;
 229         int disable_recovery;
 230         wait_queue_head_t checkpoint_event;
 231         atomic_t needs_checkpoint;
 232         struct ocfs2_journal *journal;
 233         unsigned long osb_commit_interval;
 234
 235         int local_alloc_size;
 236         enum ocfs2_local_alloc_state local_alloc_state;
 237         struct buffer_head *local_alloc_bh;
 238         u64 la_last_gd;
 239
 240         /* Next two fields are for local node slot recovery during
 241          * mount. */
 242         int dirty;
 243         struct ocfs2_dinode *local_alloc_copy;
 244
 245         struct ocfs2_alloc_stats alloc_stats;
 246         char dev_str[20];               /* "major,minor" of the device */
 247
 248         struct dlm_ctxt *dlm;
 249         struct ocfs2_lock_res osb_super_lockres;
 250         struct ocfs2_lock_res osb_rename_lockres;
 251         struct dlm_eviction_cb osb_eviction_cb;
 252         struct ocfs2_dlm_debug *osb_dlm_debug;
 253
 254         struct dentry *osb_debug_root;
 255
 256         wait_queue_head_t recovery_event;
 257
 258         spinlock_t dc_task_lock;
 259         struct task_struct *dc_task;
 260         wait_queue_head_t dc_event;
 261         unsigned long dc_wake_sequence;
 262         unsigned long dc_work_sequence;
 263
 264         struct list_head blocked_lock_list;
 265         unsigned long blocked_lock_count;
 266
 267         wait_queue_head_t               osb_mount_event;
 268
 269         /* Truncate log info */
 270         struct inode                    *osb_tl_inode;
 271         struct buffer_head              *osb_tl_bh;
 272         struct delayed_work             osb_truncate_log_wq;
 273
 274         struct ocfs2_node_map           osb_recovering_orphan_dirs;
 275         unsigned int                    *osb_orphan_wipes;
 276         wait_queue_head_t               osb_wipe_event;
 277 };
 278
 279 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 280
 281 static inline int ocfs2_should_order_data(struct inode *inode)
 282 {
 283         if (!S_ISREG(inode->i_mode))
 284                 return 0;
 285         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 286                 return 0;
 287         return 1;
 288 }
 289
 290 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 291 {
 292         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 293                 return 1;
 294         return 0;
 295 }
 296
 297 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
 298 {
 299         /*
 300          * Support for sparse files is a pre-requisite
 301          */
 302         if (!ocfs2_sparse_alloc(osb))
 303                 return 0;
 304
 305         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
 306                 return 1;
 307         return 0;
 308 }
 309
 310 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
 311 {
 312         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
 313                 return 1;
 314         return 0;
 315 }
 316
 317 /* set / clear functions because cluster events can make these happen
 318  * in parallel so we want the transitions to be atomic. this also
 319  * means that any future flags osb_flags must be protected by spinlock
 320  * too! */
 321 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 322                                       unsigned long flag)
 323 {
 324         spin_lock(&osb->osb_lock);
 325         osb->osb_flags |= flag;
 326         spin_unlock(&osb->osb_lock);
 327 }
 328
 329 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 330                                      int hard)
 331 {
 332         spin_lock(&osb->osb_lock);
 333         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 334         if (hard)
 335                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
 336         else
 337                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 338         spin_unlock(&osb->osb_lock);
 339 }
 340
 341 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 342 {
 343         int ret;
 344
 345         spin_lock(&osb->osb_lock);
 346         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 347         spin_unlock(&osb->osb_lock);
 348
 349         return ret;
 350 }
 351
 352 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 353 {
 354         int ret;
 355
 356         spin_lock(&osb->osb_lock);
 357         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 358         spin_unlock(&osb->osb_lock);
 359
 360         return ret;
 361 }
 362
 363 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 364 {
 365         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 366 }
 367
 368 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
 369         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
 370
 371 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
 372         typeof(__di) ____di = (__di);                                   \
 373         ocfs2_error((__sb),                                             \
 374                 "Dinode # %llu has bad signature %.*s",                 \
 375                 (unsigned long long)le64_to_cpu((____di)->i_blkno), 7,  \
 376                 (____di)->i_signature);                                 \
 377 } while (0)
 378
 379 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
 380         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
 381
 382 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
 383         typeof(__eb) ____eb = (__eb);                                   \
 384         ocfs2_error((__sb),                                             \
 385                 "Extent Block # %llu has bad signature %.*s",           \
 386                 (unsigned long long)le64_to_cpu((____eb)->h_blkno), 7,  \
 387                 (____eb)->h_signature);                                 \
 388 } while (0)
 389
 390 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
 391         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
 392
 393 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
 394         typeof(__gd) ____gd = (__gd);                                   \
 395                 ocfs2_error((__sb),                                     \
 396                 "Group Descriptor # %llu has bad signature %.*s",       \
 397                 (unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \
 398                 (____gd)->bg_signature);                                \
 399 } while (0)
 400
 401 static inline unsigned long ino_from_blkno(struct super_block *sb,
 402                                            u64 blkno)
 403 {
 404         return (unsigned long)(blkno & (u64)ULONG_MAX);
 405 }
 406
 407 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 408                                            u32 clusters)
 409 {
 410         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 411                 sb->s_blocksize_bits;
 412
 413         return (u64)clusters << c_to_b_bits;
 414 }
 415
 416 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 417                                            u64 blocks)
 418 {
 419         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 420                 sb->s_blocksize_bits;
 421
 422         return (u32)(blocks >> b_to_c_bits);
 423 }
 424
 425 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 426                                                     u64 bytes)
 427 {
 428         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 429         unsigned int clusters;
 430
 431         bytes += OCFS2_SB(sb)->s_clustersize - 1;
 432         /* OCFS2 just cannot have enough clusters to overflow this */
 433         clusters = (unsigned int)(bytes >> cl_bits);
 434
 435         return clusters;
 436 }
 437
 438 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 439                                          u64 bytes)
 440 {
 441         bytes += sb->s_blocksize - 1;
 442         return bytes >> sb->s_blocksize_bits;
 443 }
 444
 445 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 446                                           u32 clusters)
 447 {
 448         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 449 }
 450
 451 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 452                                                 u64 bytes)
 453 {
 454         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 455         unsigned int clusters;
 456
 457         clusters = ocfs2_clusters_for_bytes(sb, bytes);
 458         return (u64)clusters << cl_bits;
 459 }
 460
 461 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 462                                               u64 bytes)
 463 {
 464         u64 blocks;
 465
 466         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 467         return blocks << sb->s_blocksize_bits;
 468 }
 469
 470 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 471 {
 472         return (unsigned long)((bytes + 511) >> 9);
 473 }
 474
 475 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
 476                                                         unsigned long pg_index)
 477 {
 478         u32 clusters = pg_index;
 479         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 480
 481         if (unlikely(PAGE_CACHE_SHIFT > cbits))
 482                 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
 483         else if (PAGE_CACHE_SHIFT < cbits)
 484                 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
 485
 486         return clusters;
 487 }
 488
 489 /*
 490  * Find the 1st page index which covers the given clusters.
 491  */
 492 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
 493                                                         u32 clusters)
 494 {
 495         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 496         pgoff_t index = clusters;
 497
 498         if (PAGE_CACHE_SHIFT > cbits) {
 499                 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
 500         } else if (PAGE_CACHE_SHIFT < cbits) {
 501                 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
 502         }
 503
 504         return index;
 505 }
 506
 507 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
 508 {
 509         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 510         unsigned int pages_per_cluster = 1;
 511
 512         if (PAGE_CACHE_SHIFT < cbits)
 513                 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
 514
 515         return pages_per_cluster;
 516 }
 517
 518 #define ocfs2_set_bit ext2_set_bit
 519 #define ocfs2_clear_bit ext2_clear_bit
 520 #define ocfs2_test_bit ext2_test_bit
 521 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
 522 #endif  /* OCFS2_H */
 523