ocfs2: allocation hints
[linux-2.6.git] / 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 };
178
179 #define OCFS2_OSB_SOFT_RO       0x0001
180 #define OCFS2_OSB_HARD_RO       0x0002
181 #define OCFS2_OSB_ERROR_FS      0x0004
182
183 struct ocfs2_journal;
184 struct ocfs2_journal_handle;
185 struct ocfs2_super
186 {
187         struct task_struct *commit_task;
188         struct super_block *sb;
189         struct inode *root_inode;
190         struct inode *sys_root_inode;
191         struct inode *system_inodes[NUM_SYSTEM_INODES];
192
193         struct ocfs2_slot_info *slot_info;
194
195         spinlock_t node_map_lock;
196         struct ocfs2_node_map mounted_map;
197         struct ocfs2_node_map recovery_map;
198         struct ocfs2_node_map umount_map;
199
200         u64 root_blkno;
201         u64 system_dir_blkno;
202         u64 bitmap_blkno;
203         u32 bitmap_cpg;
204         u8 *uuid;
205         char *uuid_str;
206         u8 *vol_label;
207         u64 first_cluster_group_blkno;
208         u32 fs_generation;
209
210         u32 s_feature_compat;
211         u32 s_feature_incompat;
212         u32 s_feature_ro_compat;
213
214         /* Protects s_next_generaion, osb_flags. Could protect more on
215          * osb as it's very short lived. */
216         spinlock_t osb_lock;
217         u32 s_next_generation;
218         unsigned long osb_flags;
219
220         unsigned long s_mount_opt;
221
222         u16 max_slots;
223         s16 node_num;
224         s16 slot_num;
225         int s_sectsize_bits;
226         int s_clustersize;
227         int s_clustersize_bits;
228
229         atomic_t vol_state;
230         struct mutex recovery_lock;
231         struct task_struct *recovery_thread_task;
232         int disable_recovery;
233         wait_queue_head_t checkpoint_event;
234         atomic_t needs_checkpoint;
235         struct ocfs2_journal *journal;
236
237         enum ocfs2_local_alloc_state local_alloc_state;
238         struct buffer_head *local_alloc_bh;
239         u64 la_last_gd;
240
241         /* Next two fields are for local node slot recovery during
242          * mount. */
243         int dirty;
244         struct ocfs2_dinode *local_alloc_copy;
245
246         struct ocfs2_alloc_stats alloc_stats;
247         char dev_str[20];               /* "major,minor" of the device */
248
249         struct dlm_ctxt *dlm;
250         struct ocfs2_lock_res osb_super_lockres;
251         struct ocfs2_lock_res osb_rename_lockres;
252         struct dlm_eviction_cb osb_eviction_cb;
253         struct ocfs2_dlm_debug *osb_dlm_debug;
254
255         struct dentry *osb_debug_root;
256
257         wait_queue_head_t recovery_event;
258
259         spinlock_t vote_task_lock;
260         struct task_struct *vote_task;
261         wait_queue_head_t vote_event;
262         unsigned long vote_wake_sequence;
263         unsigned long vote_work_sequence;
264
265         struct list_head blocked_lock_list;
266         unsigned long blocked_lock_count;
267
268         struct list_head vote_list;
269         int vote_count;
270
271         u32 net_key;
272         spinlock_t net_response_lock;
273         unsigned int net_response_ids;
274         struct list_head net_response_list;
275
276         struct o2hb_callback_func osb_hb_up;
277         struct o2hb_callback_func osb_hb_down;
278
279         struct list_head        osb_net_handlers;
280
281         wait_queue_head_t               osb_mount_event;
282
283         /* Truncate log info */
284         struct inode                    *osb_tl_inode;
285         struct buffer_head              *osb_tl_bh;
286         struct work_struct              osb_truncate_log_wq;
287
288         struct ocfs2_node_map           osb_recovering_orphan_dirs;
289         unsigned int                    *osb_orphan_wipes;
290         wait_queue_head_t               osb_wipe_event;
291 };
292
293 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
294
295 static inline int ocfs2_should_order_data(struct inode *inode)
296 {
297         if (!S_ISREG(inode->i_mode))
298                 return 0;
299         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
300                 return 0;
301         return 1;
302 }
303
304 /* set / clear functions because cluster events can make these happen
305  * in parallel so we want the transitions to be atomic. this also
306  * means that any future flags osb_flags must be protected by spinlock
307  * too! */
308 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
309                                       unsigned long flag)
310 {
311         spin_lock(&osb->osb_lock);
312         osb->osb_flags |= flag;
313         spin_unlock(&osb->osb_lock);
314 }
315
316 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
317                                      int hard)
318 {
319         spin_lock(&osb->osb_lock);
320         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
321         if (hard)
322                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
323         else
324                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
325         spin_unlock(&osb->osb_lock);
326 }
327
328 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
329 {
330         int ret;
331
332         spin_lock(&osb->osb_lock);
333         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
334         spin_unlock(&osb->osb_lock);
335
336         return ret;
337 }
338
339 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
340 {
341         int ret;
342
343         spin_lock(&osb->osb_lock);
344         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
345         spin_unlock(&osb->osb_lock);
346
347         return ret;
348 }
349
350 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
351         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
352
353 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
354         typeof(__di) ____di = (__di);                                   \
355         ocfs2_error((__sb),                                             \
356                 "Dinode # %llu has bad signature %.*s",                 \
357                 (unsigned long long)(____di)->i_blkno, 7,               \
358                 (____di)->i_signature);                                 \
359 } while (0);
360
361 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
362         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
363
364 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
365         typeof(__eb) ____eb = (__eb);                                   \
366         ocfs2_error((__sb),                                             \
367                 "Extent Block # %llu has bad signature %.*s",           \
368                 (unsigned long long)(____eb)->h_blkno, 7,               \
369                 (____eb)->h_signature);                                 \
370 } while (0);
371
372 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
373         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
374
375 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
376         typeof(__gd) ____gd = (__gd);                                   \
377                 ocfs2_error((__sb),                                     \
378                 "Group Descriptor # %llu has bad signature %.*s",       \
379                 (unsigned long long)(____gd)->bg_blkno, 7,              \
380                 (____gd)->bg_signature);                                \
381 } while (0);
382
383 static inline unsigned long ino_from_blkno(struct super_block *sb,
384                                            u64 blkno)
385 {
386         return (unsigned long)(blkno & (u64)ULONG_MAX);
387 }
388
389 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
390                                            u32 clusters)
391 {
392         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
393                 sb->s_blocksize_bits;
394
395         return (u64)clusters << c_to_b_bits;
396 }
397
398 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
399                                            u64 blocks)
400 {
401         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
402                 sb->s_blocksize_bits;
403
404         return (u32)(blocks >> b_to_c_bits);
405 }
406
407 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
408                                                     u64 bytes)
409 {
410         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
411         unsigned int clusters;
412
413         bytes += OCFS2_SB(sb)->s_clustersize - 1;
414         /* OCFS2 just cannot have enough clusters to overflow this */
415         clusters = (unsigned int)(bytes >> cl_bits);
416
417         return clusters;
418 }
419
420 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
421                                          u64 bytes)
422 {
423         bytes += sb->s_blocksize - 1;
424         return bytes >> sb->s_blocksize_bits;
425 }
426
427 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
428                                           u32 clusters)
429 {
430         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
431 }
432
433 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
434                                                 u64 bytes)
435 {
436         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
437         unsigned int clusters;
438
439         clusters = ocfs2_clusters_for_bytes(sb, bytes);
440         return (u64)clusters << cl_bits;
441 }
442
443 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
444                                               u64 bytes)
445 {
446         u64 blocks;
447
448         blocks = ocfs2_blocks_for_bytes(sb, bytes);
449         return blocks << sb->s_blocksize_bits;
450 }
451
452 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
453 {
454         return (unsigned long)((bytes + 511) >> 9);
455 }
456
457 #define ocfs2_set_bit ext2_set_bit
458 #define ocfs2_clear_bit ext2_clear_bit
459 #define ocfs2_test_bit ext2_test_bit
460 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
461 #endif  /* OCFS2_H */
462