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 struct ocfs2_extent_map {
  50         u32             em_clusters;
  51         struct rb_root  em_extents;
  52 };
  53
  54 /* Most user visible OCFS2 inodes will have very few pieces of
  55  * metadata, but larger files (including bitmaps, etc) must be taken
  56  * into account when designing an access scheme. We allow a small
  57  * amount of inlined blocks to be stored on an array and grow the
  58  * structure into a rb tree when necessary. */
  59 #define OCFS2_INODE_MAX_CACHE_ARRAY 2
  60
  61 struct ocfs2_caching_info {
  62         unsigned int            ci_num_cached;
  63         union {
  64                 sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
  65                 struct rb_root  ci_tree;
  66         } ci_cache;
  67 };
  68
  69 /* this limits us to 256 nodes
  70  * if we need more, we can do a kmalloc for the map */
  71 #define OCFS2_NODE_MAP_MAX_NODES    256
  72 struct ocfs2_node_map {
  73         u16 num_nodes;
  74         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
  75 };
  76
  77 enum ocfs2_ast_action {
  78         OCFS2_AST_INVALID = 0,
  79         OCFS2_AST_ATTACH,
  80         OCFS2_AST_CONVERT,
  81         OCFS2_AST_DOWNCONVERT,
  82 };
  83
  84 /* actions for an unlockast function to take. */
  85 enum ocfs2_unlock_action {
  86         OCFS2_UNLOCK_INVALID = 0,
  87         OCFS2_UNLOCK_CANCEL_CONVERT,
  88         OCFS2_UNLOCK_DROP_LOCK,
  89 };
  90
  91 /* ocfs2_lock_res->l_flags flags. */
  92 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
  93                                                * the lvb */
  94 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
  95                                                * dlm_lock */
  96 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
  97                                                * downconvert*/
  98 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
  99 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
 100 #define OCFS2_LOCK_REFRESHING    (0x00000020)
 101 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
 102                                                * for shutdown paths */
 103 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
 104                                                * when to skip queueing
 105                                                * a lock because it's
 106                                                * about to be
 107                                                * dropped. */
 108 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 109
 110 struct ocfs2_lock_res_ops;
 111
 112 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 113
 114 struct ocfs2_lock_res {
 115         void                    *l_priv;
 116         struct ocfs2_lock_res_ops *l_ops;
 117         spinlock_t               l_lock;
 118
 119         struct list_head         l_blocked_list;
 120         struct list_head         l_mask_waiters;
 121
 122         enum ocfs2_lock_type     l_type;
 123         unsigned long            l_flags;
 124         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 125         int                      l_level;
 126         unsigned int             l_ro_holders;
 127         unsigned int             l_ex_holders;
 128         struct dlm_lockstatus    l_lksb;
 129
 130         /* used from AST/BAST funcs. */
 131         enum ocfs2_ast_action    l_action;
 132         enum ocfs2_unlock_action l_unlock_action;
 133         int                      l_requested;
 134         int                      l_blocking;
 135
 136         wait_queue_head_t        l_event;
 137
 138         struct list_head         l_debug_list;
 139 };
 140
 141 struct ocfs2_dlm_debug {
 142         struct kref d_refcnt;
 143         struct dentry *d_locking_state;
 144         struct list_head d_lockres_tracking;
 145 };
 146
 147 enum ocfs2_vol_state
 148 {
 149         VOLUME_INIT = 0,
 150         VOLUME_MOUNTED,
 151         VOLUME_DISMOUNTED,
 152         VOLUME_DISABLED
 153 };
 154
 155 struct ocfs2_alloc_stats
 156 {
 157         atomic_t moves;
 158         atomic_t local_data;
 159         atomic_t bitmap_data;
 160         atomic_t bg_allocs;
 161         atomic_t bg_extends;
 162 };
 163
 164 enum ocfs2_local_alloc_state
 165 {
 166         OCFS2_LA_UNUSED = 0,
 167         OCFS2_LA_ENABLED,
 168         OCFS2_LA_DISABLED
 169 };
 170
 171 enum ocfs2_mount_options
 172 {
 173         OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
 174         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
 175         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 176         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 177         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 178 };
 179
 180 #define OCFS2_OSB_SOFT_RO       0x0001
 181 #define OCFS2_OSB_HARD_RO       0x0002
 182 #define OCFS2_OSB_ERROR_FS      0x0004
 183 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
 184
 185 struct ocfs2_journal;
 186 struct ocfs2_super
 187 {
 188         struct task_struct *commit_task;
 189         struct super_block *sb;
 190         struct inode *root_inode;
 191         struct inode *sys_root_inode;
 192         struct inode *system_inodes[NUM_SYSTEM_INODES];
 193
 194         struct ocfs2_slot_info *slot_info;
 195
 196         spinlock_t node_map_lock;
 197         struct ocfs2_node_map mounted_map;
 198         struct ocfs2_node_map recovery_map;
 199         struct ocfs2_node_map umount_map;
 200
 201         u64 root_blkno;
 202         u64 system_dir_blkno;
 203         u64 bitmap_blkno;
 204         u32 bitmap_cpg;
 205         u8 *uuid;
 206         char *uuid_str;
 207         u8 *vol_label;
 208         u64 first_cluster_group_blkno;
 209         u32 fs_generation;
 210
 211         u32 s_feature_compat;
 212         u32 s_feature_incompat;
 213         u32 s_feature_ro_compat;
 214
 215         /* Protects s_next_generaion, osb_flags. Could protect more on
 216          * osb as it's very short lived. */
 217         spinlock_t osb_lock;
 218         u32 s_next_generation;
 219         unsigned long osb_flags;
 220
 221         unsigned long s_mount_opt;
 222         unsigned int s_atime_quantum;
 223
 224         u16 max_slots;
 225         s16 node_num;
 226         s16 slot_num;
 227         int s_sectsize_bits;
 228         int s_clustersize;
 229         int s_clustersize_bits;
 230
 231         atomic_t vol_state;
 232         struct mutex recovery_lock;
 233         struct task_struct *recovery_thread_task;
 234         int disable_recovery;
 235         wait_queue_head_t checkpoint_event;
 236         atomic_t needs_checkpoint;
 237         struct ocfs2_journal *journal;
 238
 239         enum ocfs2_local_alloc_state local_alloc_state;
 240         struct buffer_head *local_alloc_bh;
 241         u64 la_last_gd;
 242
 243         /* Next two fields are for local node slot recovery during
 244          * mount. */
 245         int dirty;
 246         struct ocfs2_dinode *local_alloc_copy;
 247
 248         struct ocfs2_alloc_stats alloc_stats;
 249         char dev_str[20];               /* "major,minor" of the device */
 250
 251         struct dlm_ctxt *dlm;
 252         struct ocfs2_lock_res osb_super_lockres;
 253         struct ocfs2_lock_res osb_rename_lockres;
 254         struct dlm_eviction_cb osb_eviction_cb;
 255         struct ocfs2_dlm_debug *osb_dlm_debug;
 256
 257         struct dentry *osb_debug_root;
 258
 259         wait_queue_head_t recovery_event;
 260
 261         spinlock_t vote_task_lock;
 262         struct task_struct *vote_task;
 263         wait_queue_head_t vote_event;
 264         unsigned long vote_wake_sequence;
 265         unsigned long vote_work_sequence;
 266
 267         struct list_head blocked_lock_list;
 268         unsigned long blocked_lock_count;
 269
 270         struct list_head vote_list;
 271         int vote_count;
 272
 273         u32 net_key;
 274         spinlock_t net_response_lock;
 275         unsigned int net_response_ids;
 276         struct list_head net_response_list;
 277
 278         struct o2hb_callback_func osb_hb_up;
 279         struct o2hb_callback_func osb_hb_down;
 280
 281         struct list_head        osb_net_handlers;
 282
 283         wait_queue_head_t               osb_mount_event;
 284
 285         /* Truncate log info */
 286         struct inode                    *osb_tl_inode;
 287         struct buffer_head              *osb_tl_bh;
 288         struct delayed_work             osb_truncate_log_wq;
 289
 290         struct ocfs2_node_map           osb_recovering_orphan_dirs;
 291         unsigned int                    *osb_orphan_wipes;
 292         wait_queue_head_t               osb_wipe_event;
 293 };
 294
 295 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 296
 297 static inline int ocfs2_should_order_data(struct inode *inode)
 298 {
 299         if (!S_ISREG(inode->i_mode))
 300                 return 0;
 301         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 302                 return 0;
 303         return 1;
 304 }
 305
 306 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 307 {
 308         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 309                 return 1;
 310         return 0;
 311 }
 312
 313 /* set / clear functions because cluster events can make these happen
 314  * in parallel so we want the transitions to be atomic. this also
 315  * means that any future flags osb_flags must be protected by spinlock
 316  * too! */
 317 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 318                                       unsigned long flag)
 319 {
 320         spin_lock(&osb->osb_lock);
 321         osb->osb_flags |= flag;
 322         spin_unlock(&osb->osb_lock);
 323 }
 324
 325 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 326                                      int hard)
 327 {
 328         spin_lock(&osb->osb_lock);
 329         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 330         if (hard)
 331                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
 332         else
 333                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 334         spin_unlock(&osb->osb_lock);
 335 }
 336
 337 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 338 {
 339         int ret;
 340
 341         spin_lock(&osb->osb_lock);
 342         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 343         spin_unlock(&osb->osb_lock);
 344
 345         return ret;
 346 }
 347
 348 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 349 {
 350         int ret;
 351
 352         spin_lock(&osb->osb_lock);
 353         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 354         spin_unlock(&osb->osb_lock);
 355
 356         return ret;
 357 }
 358
 359 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 360 {
 361         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 362 }
 363
 364 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
 365         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
 366
 367 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
 368         typeof(__di) ____di = (__di);                                   \
 369         ocfs2_error((__sb),                                             \
 370                 "Dinode # %llu has bad signature %.*s",                 \
 371                 (unsigned long long)(____di)->i_blkno, 7,               \
 372                 (____di)->i_signature);                                 \
 373 } while (0);
 374
 375 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
 376         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
 377
 378 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
 379         typeof(__eb) ____eb = (__eb);                                   \
 380         ocfs2_error((__sb),                                             \
 381                 "Extent Block # %llu has bad signature %.*s",           \
 382                 (unsigned long long)(____eb)->h_blkno, 7,               \
 383                 (____eb)->h_signature);                                 \
 384 } while (0);
 385
 386 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
 387         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
 388
 389 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
 390         typeof(__gd) ____gd = (__gd);                                   \
 391                 ocfs2_error((__sb),                                     \
 392                 "Group Descriptor # %llu has bad signature %.*s",       \
 393                 (unsigned long long)(____gd)->bg_blkno, 7,              \
 394                 (____gd)->bg_signature);                                \
 395 } while (0);
 396
 397 static inline unsigned long ino_from_blkno(struct super_block *sb,
 398                                            u64 blkno)
 399 {
 400         return (unsigned long)(blkno & (u64)ULONG_MAX);
 401 }
 402
 403 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 404                                            u32 clusters)
 405 {
 406         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 407                 sb->s_blocksize_bits;
 408
 409         return (u64)clusters << c_to_b_bits;
 410 }
 411
 412 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 413                                            u64 blocks)
 414 {
 415         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 416                 sb->s_blocksize_bits;
 417
 418         return (u32)(blocks >> b_to_c_bits);
 419 }
 420
 421 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 422                                                     u64 bytes)
 423 {
 424         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 425         unsigned int clusters;
 426
 427         bytes += OCFS2_SB(sb)->s_clustersize - 1;
 428         /* OCFS2 just cannot have enough clusters to overflow this */
 429         clusters = (unsigned int)(bytes >> cl_bits);
 430
 431         return clusters;
 432 }
 433
 434 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 435                                          u64 bytes)
 436 {
 437         bytes += sb->s_blocksize - 1;
 438         return bytes >> sb->s_blocksize_bits;
 439 }
 440
 441 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 442                                           u32 clusters)
 443 {
 444         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 445 }
 446
 447 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 448                                                 u64 bytes)
 449 {
 450         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 451         unsigned int clusters;
 452
 453         clusters = ocfs2_clusters_for_bytes(sb, bytes);
 454         return (u64)clusters << cl_bits;
 455 }
 456
 457 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 458                                               u64 bytes)
 459 {
 460         u64 blocks;
 461
 462         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 463         return blocks << sb->s_blocksize_bits;
 464 }
 465
 466 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 467 {
 468         return (unsigned long)((bytes + 511) >> 9);
 469 }
 470
 471 #define ocfs2_set_bit ext2_set_bit
 472 #define ocfs2_clear_bit ext2_clear_bit
 473 #define ocfs2_test_bit ext2_test_bit
 474 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
 475 #endif  /* OCFS2_H */
 476