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 "ocfs2_lockid.h"
  47
  48 /* Most user visible OCFS2 inodes will have very few pieces of
  49  * metadata, but larger files (including bitmaps, etc) must be taken
  50  * into account when designing an access scheme. We allow a small
  51  * amount of inlined blocks to be stored on an array and grow the
  52  * structure into a rb tree when necessary. */
  53 #define OCFS2_INODE_MAX_CACHE_ARRAY 2
  54
  55 struct ocfs2_caching_info {
  56         unsigned int            ci_num_cached;
  57         union {
  58                 sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
  59                 struct rb_root  ci_tree;
  60         } ci_cache;
  61 };
  62
  63 /* this limits us to 256 nodes
  64  * if we need more, we can do a kmalloc for the map */
  65 #define OCFS2_NODE_MAP_MAX_NODES    256
  66 struct ocfs2_node_map {
  67         u16 num_nodes;
  68         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
  69 };
  70
  71 enum ocfs2_ast_action {
  72         OCFS2_AST_INVALID = 0,
  73         OCFS2_AST_ATTACH,
  74         OCFS2_AST_CONVERT,
  75         OCFS2_AST_DOWNCONVERT,
  76 };
  77
  78 /* actions for an unlockast function to take. */
  79 enum ocfs2_unlock_action {
  80         OCFS2_UNLOCK_INVALID = 0,
  81         OCFS2_UNLOCK_CANCEL_CONVERT,
  82         OCFS2_UNLOCK_DROP_LOCK,
  83 };
  84
  85 /* ocfs2_lock_res->l_flags flags. */
  86 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
  87                                                * the lvb */
  88 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
  89                                                * dlm_lock */
  90 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
  91                                                * downconvert*/
  92 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
  93 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
  94 #define OCFS2_LOCK_REFRESHING    (0x00000020)
  95 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
  96                                                * for shutdown paths */
  97 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
  98                                                * when to skip queueing
  99                                                * a lock because it's
 100                                                * about to be
 101                                                * dropped. */
 102 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 103 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
 104
 105 struct ocfs2_lock_res_ops;
 106
 107 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 108
 109 struct ocfs2_lock_res {
 110         void                    *l_priv;
 111         struct ocfs2_lock_res_ops *l_ops;
 112         spinlock_t               l_lock;
 113
 114         struct list_head         l_blocked_list;
 115         struct list_head         l_mask_waiters;
 116
 117         enum ocfs2_lock_type     l_type;
 118         unsigned long            l_flags;
 119         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 120         int                      l_level;
 121         unsigned int             l_ro_holders;
 122         unsigned int             l_ex_holders;
 123         struct dlm_lockstatus    l_lksb;
 124
 125         /* used from AST/BAST funcs. */
 126         enum ocfs2_ast_action    l_action;
 127         enum ocfs2_unlock_action l_unlock_action;
 128         int                      l_requested;
 129         int                      l_blocking;
 130
 131         wait_queue_head_t        l_event;
 132
 133         struct list_head         l_debug_list;
 134 };
 135
 136 struct ocfs2_dlm_debug {
 137         struct kref d_refcnt;
 138         struct dentry *d_locking_state;
 139         struct list_head d_lockres_tracking;
 140 };
 141
 142 enum ocfs2_vol_state
 143 {
 144         VOLUME_INIT = 0,
 145         VOLUME_MOUNTED,
 146         VOLUME_DISMOUNTED,
 147         VOLUME_DISABLED
 148 };
 149
 150 struct ocfs2_alloc_stats
 151 {
 152         atomic_t moves;
 153         atomic_t local_data;
 154         atomic_t bitmap_data;
 155         atomic_t bg_allocs;
 156         atomic_t bg_extends;
 157 };
 158
 159 enum ocfs2_local_alloc_state
 160 {
 161         OCFS2_LA_UNUSED = 0,
 162         OCFS2_LA_ENABLED,
 163         OCFS2_LA_DISABLED
 164 };
 165
 166 enum ocfs2_mount_options
 167 {
 168         OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
 169         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
 170         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 171         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 172         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 173         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
 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_slot_info;
 183 struct ocfs2_recovery_map;
 184 struct ocfs2_super
 185 {
 186         struct task_struct *commit_task;
 187         struct super_block *sb;
 188         struct inode *root_inode;
 189         struct inode *sys_root_inode;
 190         struct inode *system_inodes[NUM_SYSTEM_INODES];
 191
 192         struct ocfs2_slot_info *slot_info;
 193
 194         spinlock_t node_map_lock;
 195
 196         u64 root_blkno;
 197         u64 system_dir_blkno;
 198         u64 bitmap_blkno;
 199         u32 bitmap_cpg;
 200         u8 *uuid;
 201         char *uuid_str;
 202         u8 *vol_label;
 203         u64 first_cluster_group_blkno;
 204         u32 fs_generation;
 205
 206         u32 s_feature_compat;
 207         u32 s_feature_incompat;
 208         u32 s_feature_ro_compat;
 209
 210         /* Protects s_next_generaion, osb_flags. Could protect more on
 211          * osb as it's very short lived. */
 212         spinlock_t osb_lock;
 213         u32 s_next_generation;
 214         unsigned long osb_flags;
 215
 216         unsigned long s_mount_opt;
 217         unsigned int s_atime_quantum;
 218
 219         unsigned int max_slots;
 220         s16 node_num;
 221         int slot_num;
 222         int preferred_slot;
 223         int s_sectsize_bits;
 224         int s_clustersize;
 225         int s_clustersize_bits;
 226
 227         atomic_t vol_state;
 228         struct mutex recovery_lock;
 229         struct ocfs2_recovery_map *recovery_map;
 230         struct task_struct *recovery_thread_task;
 231         int disable_recovery;
 232         wait_queue_head_t checkpoint_event;
 233         atomic_t needs_checkpoint;
 234         struct ocfs2_journal *journal;
 235         unsigned long osb_commit_interval;
 236
 237         int local_alloc_size;
 238         enum ocfs2_local_alloc_state local_alloc_state;
 239         struct buffer_head *local_alloc_bh;
 240         u64 la_last_gd;
 241
 242         /* Next two fields are for local node slot recovery during
 243          * mount. */
 244         int dirty;
 245         struct ocfs2_dinode *local_alloc_copy;
 246
 247         struct ocfs2_alloc_stats alloc_stats;
 248         char dev_str[20];               /* "major,minor" of the device */
 249
 250         struct dlm_ctxt *dlm;
 251         struct ocfs2_lock_res osb_super_lockres;
 252         struct ocfs2_lock_res osb_rename_lockres;
 253         struct dlm_eviction_cb osb_eviction_cb;
 254         struct ocfs2_dlm_debug *osb_dlm_debug;
 255         struct dlm_protocol_version osb_locking_proto;
 256
 257         struct dentry *osb_debug_root;
 258
 259         wait_queue_head_t recovery_event;
 260
 261         spinlock_t dc_task_lock;
 262         struct task_struct *dc_task;
 263         wait_queue_head_t dc_event;
 264         unsigned long dc_wake_sequence;
 265         unsigned long dc_work_sequence;
 266
 267         /*
 268          * Any thread can add locks to the list, but the downconvert
 269          * thread is the only one allowed to remove locks. Any change
 270          * to this rule requires updating
 271          * ocfs2_downconvert_thread_do_work().
 272          */
 273         struct list_head blocked_lock_list;
 274         unsigned long blocked_lock_count;
 275
 276         wait_queue_head_t               osb_mount_event;
 277
 278         /* Truncate log info */
 279         struct inode                    *osb_tl_inode;
 280         struct buffer_head              *osb_tl_bh;
 281         struct delayed_work             osb_truncate_log_wq;
 282
 283         struct ocfs2_node_map           osb_recovering_orphan_dirs;
 284         unsigned int                    *osb_orphan_wipes;
 285         wait_queue_head_t               osb_wipe_event;
 286 };
 287
 288 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 289
 290 static inline int ocfs2_should_order_data(struct inode *inode)
 291 {
 292         if (!S_ISREG(inode->i_mode))
 293                 return 0;
 294         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 295                 return 0;
 296         return 1;
 297 }
 298
 299 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 300 {
 301         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 302                 return 1;
 303         return 0;
 304 }
 305
 306 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
 307 {
 308         /*
 309          * Support for sparse files is a pre-requisite
 310          */
 311         if (!ocfs2_sparse_alloc(osb))
 312                 return 0;
 313
 314         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
 315                 return 1;
 316         return 0;
 317 }
 318
 319 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
 320 {
 321         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
 322                 return 1;
 323         return 0;
 324 }
 325
 326 /* set / clear functions because cluster events can make these happen
 327  * in parallel so we want the transitions to be atomic. this also
 328  * means that any future flags osb_flags must be protected by spinlock
 329  * too! */
 330 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 331                                       unsigned long flag)
 332 {
 333         spin_lock(&osb->osb_lock);
 334         osb->osb_flags |= flag;
 335         spin_unlock(&osb->osb_lock);
 336 }
 337
 338 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 339                                      int hard)
 340 {
 341         spin_lock(&osb->osb_lock);
 342         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 343         if (hard)
 344                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
 345         else
 346                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 347         spin_unlock(&osb->osb_lock);
 348 }
 349
 350 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 351 {
 352         int ret;
 353
 354         spin_lock(&osb->osb_lock);
 355         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 356         spin_unlock(&osb->osb_lock);
 357
 358         return ret;
 359 }
 360
 361 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 362 {
 363         int ret;
 364
 365         spin_lock(&osb->osb_lock);
 366         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 367         spin_unlock(&osb->osb_lock);
 368
 369         return ret;
 370 }
 371
 372 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 373 {
 374         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 375 }
 376
 377 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
 378         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
 379
 380 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
 381         typeof(__di) ____di = (__di);                                   \
 382         ocfs2_error((__sb),                                             \
 383                 "Dinode # %llu has bad signature %.*s",                 \
 384                 (unsigned long long)le64_to_cpu((____di)->i_blkno), 7,  \
 385                 (____di)->i_signature);                                 \
 386 } while (0)
 387
 388 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
 389         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
 390
 391 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
 392         typeof(__eb) ____eb = (__eb);                                   \
 393         ocfs2_error((__sb),                                             \
 394                 "Extent Block # %llu has bad signature %.*s",           \
 395                 (unsigned long long)le64_to_cpu((____eb)->h_blkno), 7,  \
 396                 (____eb)->h_signature);                                 \
 397 } while (0)
 398
 399 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
 400         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
 401
 402 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
 403         typeof(__gd) ____gd = (__gd);                                   \
 404                 ocfs2_error((__sb),                                     \
 405                 "Group Descriptor # %llu has bad signature %.*s",       \
 406                 (unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \
 407                 (____gd)->bg_signature);                                \
 408 } while (0)
 409
 410 static inline unsigned long ino_from_blkno(struct super_block *sb,
 411                                            u64 blkno)
 412 {
 413         return (unsigned long)(blkno & (u64)ULONG_MAX);
 414 }
 415
 416 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 417                                            u32 clusters)
 418 {
 419         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 420                 sb->s_blocksize_bits;
 421
 422         return (u64)clusters << c_to_b_bits;
 423 }
 424
 425 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 426                                            u64 blocks)
 427 {
 428         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 429                 sb->s_blocksize_bits;
 430
 431         return (u32)(blocks >> b_to_c_bits);
 432 }
 433
 434 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 435                                                     u64 bytes)
 436 {
 437         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 438         unsigned int clusters;
 439
 440         bytes += OCFS2_SB(sb)->s_clustersize - 1;
 441         /* OCFS2 just cannot have enough clusters to overflow this */
 442         clusters = (unsigned int)(bytes >> cl_bits);
 443
 444         return clusters;
 445 }
 446
 447 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 448                                          u64 bytes)
 449 {
 450         bytes += sb->s_blocksize - 1;
 451         return bytes >> sb->s_blocksize_bits;
 452 }
 453
 454 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 455                                           u32 clusters)
 456 {
 457         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 458 }
 459
 460 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 461                                                 u64 bytes)
 462 {
 463         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 464         unsigned int clusters;
 465
 466         clusters = ocfs2_clusters_for_bytes(sb, bytes);
 467         return (u64)clusters << cl_bits;
 468 }
 469
 470 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 471                                               u64 bytes)
 472 {
 473         u64 blocks;
 474
 475         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 476         return blocks << sb->s_blocksize_bits;
 477 }
 478
 479 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 480 {
 481         return (unsigned long)((bytes + 511) >> 9);
 482 }
 483
 484 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
 485                                                         unsigned long pg_index)
 486 {
 487         u32 clusters = pg_index;
 488         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 489
 490         if (unlikely(PAGE_CACHE_SHIFT > cbits))
 491                 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
 492         else if (PAGE_CACHE_SHIFT < cbits)
 493                 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
 494
 495         return clusters;
 496 }
 497
 498 /*
 499  * Find the 1st page index which covers the given clusters.
 500  */
 501 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
 502                                                         u32 clusters)
 503 {
 504         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 505         pgoff_t index = clusters;
 506
 507         if (PAGE_CACHE_SHIFT > cbits) {
 508                 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
 509         } else if (PAGE_CACHE_SHIFT < cbits) {
 510                 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
 511         }
 512
 513         return index;
 514 }
 515
 516 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
 517 {
 518         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 519         unsigned int pages_per_cluster = 1;
 520
 521         if (PAGE_CACHE_SHIFT < cbits)
 522                 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
 523
 524         return pages_per_cluster;
 525 }
 526
 527 #define ocfs2_set_bit ext2_set_bit
 528 #define ocfs2_clear_bit ext2_clear_bit
 529 #define ocfs2_test_bit ext2_test_bit
 530 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
 531 #endif  /* OCFS2_H */
 532