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
  38 #include "cluster/nodemanager.h"
  39 #include "cluster/heartbeat.h"
  40 #include "cluster/tcp.h"
  41
  42 #include "dlm/dlmapi.h"
  43
  44 #include "ocfs2_fs.h"
  45 #include "endian.h"
  46 #include "ocfs2_lockid.h"
  47
  48 struct ocfs2_extent_map {
  49         u32             em_clusters;
  50         struct rb_root  em_extents;
  51 };
  52
  53 /* Most user visible OCFS2 inodes will have very few pieces of
  54  * metadata, but larger files (including bitmaps, etc) must be taken
  55  * into account when designing an access scheme. We allow a small
  56  * amount of inlined blocks to be stored on an array and grow the
  57  * structure into a rb tree when necessary. */
  58 #define OCFS2_INODE_MAX_CACHE_ARRAY 2
  59
  60 struct ocfs2_caching_info {
  61         unsigned int            ci_num_cached;
  62         union {
  63                 sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
  64                 struct rb_root  ci_tree;
  65         } ci_cache;
  66 };
  67
  68 /* this limits us to 256 nodes
  69  * if we need more, we can do a kmalloc for the map */
  70 #define OCFS2_NODE_MAP_MAX_NODES    256
  71 struct ocfs2_node_map {
  72         u16 num_nodes;
  73         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
  74 };
  75
  76 enum ocfs2_ast_action {
  77         OCFS2_AST_INVALID = 0,
  78         OCFS2_AST_ATTACH,
  79         OCFS2_AST_CONVERT,
  80         OCFS2_AST_DOWNCONVERT,
  81 };
  82
  83 /* actions for an unlockast function to take. */
  84 enum ocfs2_unlock_action {
  85         OCFS2_UNLOCK_INVALID = 0,
  86         OCFS2_UNLOCK_CANCEL_CONVERT,
  87         OCFS2_UNLOCK_DROP_LOCK,
  88 };
  89
  90 /* ocfs2_lock_res->l_flags flags. */
  91 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
  92                                                * the lvb */
  93 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
  94                                                * dlm_lock */
  95 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
  96                                                * downconvert*/
  97 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
  98 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
  99 #define OCFS2_LOCK_REFRESHING    (0x00000020)
 100 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
 101                                                * for shutdown paths */
 102 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
 103                                                * when to skip queueing
 104                                                * a lock because it's
 105                                                * about to be
 106                                                * dropped. */
 107 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 108
 109 struct ocfs2_lock_res_ops;
 110
 111 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 112
 113 struct ocfs2_lock_res {
 114         void                    *l_priv;
 115         struct ocfs2_lock_res_ops *l_ops;
 116         spinlock_t               l_lock;
 117
 118         struct list_head         l_blocked_list;
 119         struct list_head         l_mask_waiters;
 120
 121         enum ocfs2_lock_type     l_type;
 122         unsigned long            l_flags;
 123         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 124         int                      l_level;
 125         unsigned int             l_ro_holders;
 126         unsigned int             l_ex_holders;
 127         struct dlm_lockstatus    l_lksb;
 128
 129         /* used from AST/BAST funcs. */
 130         enum ocfs2_ast_action    l_action;
 131         enum ocfs2_unlock_action l_unlock_action;
 132         int                      l_requested;
 133         int                      l_blocking;
 134
 135         wait_queue_head_t        l_event;
 136
 137         struct list_head         l_debug_list;
 138 };
 139
 140 struct ocfs2_dlm_debug {
 141         struct kref d_refcnt;
 142         struct dentry *d_locking_state;
 143         struct list_head d_lockres_tracking;
 144 };
 145
 146 enum ocfs2_vol_state
 147 {
 148         VOLUME_INIT = 0,
 149         VOLUME_MOUNTED,
 150         VOLUME_DISMOUNTED,
 151         VOLUME_DISABLED
 152 };
 153
 154 struct ocfs2_alloc_stats
 155 {
 156         atomic_t moves;
 157         atomic_t local_data;
 158         atomic_t bitmap_data;
 159         atomic_t bg_allocs;
 160         atomic_t bg_extends;
 161 };
 162
 163 enum ocfs2_local_alloc_state
 164 {
 165         OCFS2_LA_UNUSED = 0,
 166         OCFS2_LA_ENABLED,
 167         OCFS2_LA_DISABLED
 168 };
 169
 170 enum ocfs2_mount_options
 171 {
 172         OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
 173         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
 174         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 175         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 176         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 177 #ifdef OCFS2_ORACORE_WORKAROUNDS
 178         OCFS2_MOUNT_COMPAT_OCFS = 1 << 30, /* ocfs1 compatibility mode */
 179 #endif
 180 };
 181
 182 #define OCFS2_OSB_SOFT_RO       0x0001
 183 #define OCFS2_OSB_HARD_RO       0x0002
 184 #define OCFS2_OSB_ERROR_FS      0x0004
 185
 186 struct ocfs2_journal;
 187 struct ocfs2_journal_handle;
 188 struct ocfs2_super
 189 {
 190         u32 osb_id;             /* id used by the proc interface */
 191         struct task_struct *commit_task;
 192         struct super_block *sb;
 193         struct inode *root_inode;
 194         struct inode *sys_root_inode;
 195         struct inode *system_inodes[NUM_SYSTEM_INODES];
 196
 197         struct ocfs2_slot_info *slot_info;
 198
 199         spinlock_t node_map_lock;
 200         struct ocfs2_node_map mounted_map;
 201         struct ocfs2_node_map recovery_map;
 202         struct ocfs2_node_map umount_map;
 203
 204         u32 num_clusters;
 205         u64 root_blkno;
 206         u64 system_dir_blkno;
 207         u64 bitmap_blkno;
 208         u32 bitmap_cpg;
 209         u8 *uuid;
 210         char *uuid_str;
 211         u8 *vol_label;
 212         u64 first_cluster_group_blkno;
 213         u32 fs_generation;
 214
 215         u32 s_feature_compat;
 216         u32 s_feature_incompat;
 217         u32 s_feature_ro_compat;
 218
 219         /* Protects s_next_generaion, osb_flags. Could protect more on
 220          * osb as it's very short lived. */
 221         spinlock_t osb_lock;
 222         u32 s_next_generation;
 223         unsigned long osb_flags;
 224
 225         unsigned long s_mount_opt;
 226
 227         u16 max_slots;
 228         u16 num_nodes;
 229         s16 node_num;
 230         s16 slot_num;
 231         int s_sectsize_bits;
 232         int s_clustersize;
 233         int s_clustersize_bits;
 234         struct proc_dir_entry *proc_sub_dir; /* points to /proc/fs/ocfs2/<maj_min> */
 235
 236         atomic_t vol_state;
 237         struct mutex recovery_lock;
 238         struct task_struct *recovery_thread_task;
 239         int disable_recovery;
 240         wait_queue_head_t checkpoint_event;
 241         atomic_t needs_checkpoint;
 242         struct ocfs2_journal *journal;
 243
 244         enum ocfs2_local_alloc_state local_alloc_state;
 245         struct buffer_head *local_alloc_bh;
 246
 247         /* Next two fields are for local node slot recovery during
 248          * mount. */
 249         int dirty;
 250         struct ocfs2_dinode *local_alloc_copy;
 251
 252         struct ocfs2_alloc_stats alloc_stats;
 253         char dev_str[20];               /* "major,minor" of the device */
 254
 255         struct dlm_ctxt *dlm;
 256         struct ocfs2_lock_res osb_super_lockres;
 257         struct ocfs2_lock_res osb_rename_lockres;
 258         struct dlm_eviction_cb osb_eviction_cb;
 259         struct ocfs2_dlm_debug *osb_dlm_debug;
 260
 261         struct dentry *osb_debug_root;
 262
 263         wait_queue_head_t recovery_event;
 264
 265         spinlock_t vote_task_lock;
 266         struct task_struct *vote_task;
 267         wait_queue_head_t vote_event;
 268         unsigned long vote_wake_sequence;
 269         unsigned long vote_work_sequence;
 270
 271         struct list_head blocked_lock_list;
 272         unsigned long blocked_lock_count;
 273
 274         struct list_head vote_list;
 275         int vote_count;
 276
 277         u32 net_key;
 278         spinlock_t net_response_lock;
 279         unsigned int net_response_ids;
 280         struct list_head net_response_list;
 281
 282         struct o2hb_callback_func osb_hb_up;
 283         struct o2hb_callback_func osb_hb_down;
 284
 285         struct list_head        osb_net_handlers;
 286
 287         wait_queue_head_t               osb_mount_event;
 288
 289         /* Truncate log info */
 290         struct inode                    *osb_tl_inode;
 291         struct buffer_head              *osb_tl_bh;
 292         struct work_struct              osb_truncate_log_wq;
 293 };
 294
 295 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 296 #define OCFS2_MAX_OSB_ID             65536
 297
 298 static inline int ocfs2_should_order_data(struct inode *inode)
 299 {
 300         if (!S_ISREG(inode->i_mode))
 301                 return 0;
 302         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 303                 return 0;
 304         return 1;
 305 }
 306
 307 /* set / clear functions because cluster events can make these happen
 308  * in parallel so we want the transitions to be atomic. this also
 309  * means that any future flags osb_flags must be protected by spinlock
 310  * too! */
 311 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 312                                       unsigned long flag)
 313 {
 314         spin_lock(&osb->osb_lock);
 315         osb->osb_flags |= flag;
 316         spin_unlock(&osb->osb_lock);
 317 }
 318
 319 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 320                                      int hard)
 321 {
 322         spin_lock(&osb->osb_lock);
 323         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 324         if (hard)
 325                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
 326         else
 327                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 328         spin_unlock(&osb->osb_lock);
 329 }
 330
 331 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 332 {
 333         int ret;
 334
 335         spin_lock(&osb->osb_lock);
 336         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 337         spin_unlock(&osb->osb_lock);
 338
 339         return ret;
 340 }
 341
 342 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 343 {
 344         int ret;
 345
 346         spin_lock(&osb->osb_lock);
 347         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 348         spin_unlock(&osb->osb_lock);
 349
 350         return ret;
 351 }
 352
 353 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
 354         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
 355
 356 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
 357         typeof(__di) ____di = (__di);                                   \
 358         ocfs2_error((__sb),                                             \
 359                 "Dinode # %"MLFu64" has bad signature %.*s",            \
 360                 (____di)->i_blkno, 7,                                   \
 361                 (____di)->i_signature);                                 \
 362 } while (0);
 363
 364 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
 365         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
 366
 367 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
 368         typeof(__eb) ____eb = (__eb);                                   \
 369         ocfs2_error((__sb),                                             \
 370                 "Extent Block # %"MLFu64" has bad signature %.*s",      \
 371                 (____eb)->h_blkno, 7,                                   \
 372                 (____eb)->h_signature);                                 \
 373 } while (0);
 374
 375 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
 376         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
 377
 378 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
 379         typeof(__gd) ____gd = (__gd);                                   \
 380                 ocfs2_error((__sb),                                     \
 381                 "Group Descriptor # %"MLFu64" has bad signature %.*s",  \
 382                 (____gd)->bg_blkno, 7,                                  \
 383                 (____gd)->bg_signature);                                \
 384 } while (0);
 385
 386 static inline unsigned long ino_from_blkno(struct super_block *sb,
 387                                            u64 blkno)
 388 {
 389         return (unsigned long)(blkno & (u64)ULONG_MAX);
 390 }
 391
 392 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 393                                            u32 clusters)
 394 {
 395         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 396                 sb->s_blocksize_bits;
 397
 398         return (u64)clusters << c_to_b_bits;
 399 }
 400
 401 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 402                                            u64 blocks)
 403 {
 404         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 405                 sb->s_blocksize_bits;
 406
 407         return (u32)(blocks >> b_to_c_bits);
 408 }
 409
 410 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 411                                                     u64 bytes)
 412 {
 413         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 414         unsigned int clusters;
 415
 416         bytes += OCFS2_SB(sb)->s_clustersize - 1;
 417         /* OCFS2 just cannot have enough clusters to overflow this */
 418         clusters = (unsigned int)(bytes >> cl_bits);
 419
 420         return clusters;
 421 }
 422
 423 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 424                                          u64 bytes)
 425 {
 426         bytes += sb->s_blocksize - 1;
 427         return bytes >> sb->s_blocksize_bits;
 428 }
 429
 430 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 431                                           u32 clusters)
 432 {
 433         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 434 }
 435
 436 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 437                                                 u64 bytes)
 438 {
 439         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 440         unsigned int clusters;
 441
 442         clusters = ocfs2_clusters_for_bytes(sb, bytes);
 443         return (u64)clusters << cl_bits;
 444 }
 445
 446 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 447                                               u64 bytes)
 448 {
 449         u64 blocks;
 450
 451         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 452         return blocks << sb->s_blocksize_bits;
 453 }
 454
 455 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 456 {
 457         return (unsigned long)((bytes + 511) >> 9);
 458 }
 459
 460 #define ocfs2_set_bit ext2_set_bit
 461 #define ocfs2_clear_bit ext2_clear_bit
 462 #define ocfs2_test_bit ext2_test_bit
 463 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
 464 #endif  /* OCFS2_H */
 465