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ocfs2: Move o2hb functionality into the stack glue.
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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 /* For union ocfs2_dlm_lksb */
40 #include "stackglue.h"
41
42 #include "ocfs2_fs.h"
43 #include "ocfs2_lockid.h"
44
45 /* Most user visible OCFS2 inodes will have very few pieces of
46  * metadata, but larger files (including bitmaps, etc) must be taken
47  * into account when designing an access scheme. We allow a small
48  * amount of inlined blocks to be stored on an array and grow the
49  * structure into a rb tree when necessary. */
50 #define OCFS2_INODE_MAX_CACHE_ARRAY 2
51
52 struct ocfs2_caching_info {
53         unsigned int            ci_num_cached;
54         union {
55                 sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
56                 struct rb_root  ci_tree;
57         } ci_cache;
58 };
59
60 /* this limits us to 256 nodes
61  * if we need more, we can do a kmalloc for the map */
62 #define OCFS2_NODE_MAP_MAX_NODES    256
63 struct ocfs2_node_map {
64         u16 num_nodes;
65         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
66 };
67
68 enum ocfs2_ast_action {
69         OCFS2_AST_INVALID = 0,
70         OCFS2_AST_ATTACH,
71         OCFS2_AST_CONVERT,
72         OCFS2_AST_DOWNCONVERT,
73 };
74
75 /* actions for an unlockast function to take. */
76 enum ocfs2_unlock_action {
77         OCFS2_UNLOCK_INVALID = 0,
78         OCFS2_UNLOCK_CANCEL_CONVERT,
79         OCFS2_UNLOCK_DROP_LOCK,
80 };
81
82 /* ocfs2_lock_res->l_flags flags. */
83 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* have we initialized
84                                                * the lvb */
85 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
86                                                * dlm_lock */
87 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
88                                                * downconvert*/
89 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
90 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
91 #define OCFS2_LOCK_REFRESHING    (0x00000020)
92 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
93                                                * for shutdown paths */
94 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
95                                                * when to skip queueing
96                                                * a lock because it's
97                                                * about to be
98                                                * dropped. */
99 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
100 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
101
102 struct ocfs2_lock_res_ops;
103
104 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
105
106 struct ocfs2_lock_res {
107         void                    *l_priv;
108         struct ocfs2_lock_res_ops *l_ops;
109         spinlock_t               l_lock;
110
111         struct list_head         l_blocked_list;
112         struct list_head         l_mask_waiters;
113
114         enum ocfs2_lock_type     l_type;
115         unsigned long            l_flags;
116         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
117         int                      l_level;
118         unsigned int             l_ro_holders;
119         unsigned int             l_ex_holders;
120         union ocfs2_dlm_lksb     l_lksb;
121
122         /* used from AST/BAST funcs. */
123         enum ocfs2_ast_action    l_action;
124         enum ocfs2_unlock_action l_unlock_action;
125         int                      l_requested;
126         int                      l_blocking;
127
128         wait_queue_head_t        l_event;
129
130         struct list_head         l_debug_list;
131 };
132
133 struct ocfs2_dlm_debug {
134         struct kref d_refcnt;
135         struct dentry *d_locking_state;
136         struct list_head d_lockres_tracking;
137 };
138
139 enum ocfs2_vol_state
140 {
141         VOLUME_INIT = 0,
142         VOLUME_MOUNTED,
143         VOLUME_DISMOUNTED,
144         VOLUME_DISABLED
145 };
146
147 struct ocfs2_alloc_stats
148 {
149         atomic_t moves;
150         atomic_t local_data;
151         atomic_t bitmap_data;
152         atomic_t bg_allocs;
153         atomic_t bg_extends;
154 };
155
156 enum ocfs2_local_alloc_state
157 {
158         OCFS2_LA_UNUSED = 0,
159         OCFS2_LA_ENABLED,
160         OCFS2_LA_DISABLED
161 };
162
163 enum ocfs2_mount_options
164 {
165         OCFS2_MOUNT_HB_LOCAL   = 1 << 0, /* Heartbeat started in local mode */
166         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
167         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
168         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
169         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
170         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
171 };
172
173 #define OCFS2_OSB_SOFT_RO       0x0001
174 #define OCFS2_OSB_HARD_RO       0x0002
175 #define OCFS2_OSB_ERROR_FS      0x0004
176 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
177
178 struct ocfs2_journal;
179 struct ocfs2_slot_info;
180 struct ocfs2_recovery_map;
181 struct ocfs2_super
182 {
183         struct task_struct *commit_task;
184         struct super_block *sb;
185         struct inode *root_inode;
186         struct inode *sys_root_inode;
187         struct inode *system_inodes[NUM_SYSTEM_INODES];
188
189         struct ocfs2_slot_info *slot_info;
190
191         spinlock_t node_map_lock;
192
193         u64 root_blkno;
194         u64 system_dir_blkno;
195         u64 bitmap_blkno;
196         u32 bitmap_cpg;
197         u8 *uuid;
198         char *uuid_str;
199         u8 *vol_label;
200         u64 first_cluster_group_blkno;
201         u32 fs_generation;
202
203         u32 s_feature_compat;
204         u32 s_feature_incompat;
205         u32 s_feature_ro_compat;
206
207         /* Protects s_next_generaion, osb_flags. Could protect more on
208          * osb as it's very short lived. */
209         spinlock_t osb_lock;
210         u32 s_next_generation;
211         unsigned long osb_flags;
212
213         unsigned long s_mount_opt;
214         unsigned int s_atime_quantum;
215
216         unsigned int max_slots;
217         unsigned int node_num;
218         int slot_num;
219         int preferred_slot;
220         int s_sectsize_bits;
221         int s_clustersize;
222         int s_clustersize_bits;
223
224         atomic_t vol_state;
225         struct mutex recovery_lock;
226         struct ocfs2_recovery_map *recovery_map;
227         struct task_struct *recovery_thread_task;
228         int disable_recovery;
229         wait_queue_head_t checkpoint_event;
230         atomic_t needs_checkpoint;
231         struct ocfs2_journal *journal;
232         unsigned long osb_commit_interval;
233
234         int local_alloc_size;
235         enum ocfs2_local_alloc_state local_alloc_state;
236         struct buffer_head *local_alloc_bh;
237         u64 la_last_gd;
238
239         /* Next two fields are for local node slot recovery during
240          * mount. */
241         int dirty;
242         struct ocfs2_dinode *local_alloc_copy;
243
244         struct ocfs2_alloc_stats alloc_stats;
245         char dev_str[20];               /* "major,minor" of the device */
246
247         struct ocfs2_cluster_connection *cconn;
248         struct ocfs2_lock_res osb_super_lockres;
249         struct ocfs2_lock_res osb_rename_lockres;
250         struct ocfs2_dlm_debug *osb_dlm_debug;
251
252         struct dentry *osb_debug_root;
253
254         wait_queue_head_t recovery_event;
255
256         spinlock_t dc_task_lock;
257         struct task_struct *dc_task;
258         wait_queue_head_t dc_event;
259         unsigned long dc_wake_sequence;
260         unsigned long dc_work_sequence;
261
262         /*
263          * Any thread can add locks to the list, but the downconvert
264          * thread is the only one allowed to remove locks. Any change
265          * to this rule requires updating
266          * ocfs2_downconvert_thread_do_work().
267          */
268         struct list_head blocked_lock_list;
269         unsigned long blocked_lock_count;
270
271         wait_queue_head_t               osb_mount_event;
272
273         /* Truncate log info */
274         struct inode                    *osb_tl_inode;
275         struct buffer_head              *osb_tl_bh;
276         struct delayed_work             osb_truncate_log_wq;
277
278         struct ocfs2_node_map           osb_recovering_orphan_dirs;
279         unsigned int                    *osb_orphan_wipes;
280         wait_queue_head_t               osb_wipe_event;
281 };
282
283 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
284
285 static inline int ocfs2_should_order_data(struct inode *inode)
286 {
287         if (!S_ISREG(inode->i_mode))
288                 return 0;
289         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
290                 return 0;
291         return 1;
292 }
293
294 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
295 {
296         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
297                 return 1;
298         return 0;
299 }
300
301 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
302 {
303         /*
304          * Support for sparse files is a pre-requisite
305          */
306         if (!ocfs2_sparse_alloc(osb))
307                 return 0;
308
309         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
310                 return 1;
311         return 0;
312 }
313
314 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
315 {
316         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
317                 return 1;
318         return 0;
319 }
320
321 /* set / clear functions because cluster events can make these happen
322  * in parallel so we want the transitions to be atomic. this also
323  * means that any future flags osb_flags must be protected by spinlock
324  * too! */
325 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
326                                       unsigned long flag)
327 {
328         spin_lock(&osb->osb_lock);
329         osb->osb_flags |= flag;
330         spin_unlock(&osb->osb_lock);
331 }
332
333 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
334                                      int hard)
335 {
336         spin_lock(&osb->osb_lock);
337         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
338         if (hard)
339                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
340         else
341                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
342         spin_unlock(&osb->osb_lock);
343 }
344
345 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
346 {
347         int ret;
348
349         spin_lock(&osb->osb_lock);
350         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
351         spin_unlock(&osb->osb_lock);
352
353         return ret;
354 }
355
356 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
357 {
358         int ret;
359
360         spin_lock(&osb->osb_lock);
361         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
362         spin_unlock(&osb->osb_lock);
363
364         return ret;
365 }
366
367 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
368 {
369         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
370 }
371
372 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
373 {
374         return (osb->s_feature_incompat &
375                 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
376 }
377
378
379 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
380         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
381
382 #define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \
383         typeof(__di) ____di = (__di);                                   \
384         ocfs2_error((__sb),                                             \
385                 "Dinode # %llu has bad signature %.*s",                 \
386                 (unsigned long long)le64_to_cpu((____di)->i_blkno), 7,  \
387                 (____di)->i_signature);                                 \
388 } while (0)
389
390 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
391         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
392
393 #define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \
394         typeof(__eb) ____eb = (__eb);                                   \
395         ocfs2_error((__sb),                                             \
396                 "Extent Block # %llu has bad signature %.*s",           \
397                 (unsigned long long)le64_to_cpu((____eb)->h_blkno), 7,  \
398                 (____eb)->h_signature);                                 \
399 } while (0)
400
401 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
402         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
403
404 #define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \
405         typeof(__gd) ____gd = (__gd);                                   \
406                 ocfs2_error((__sb),                                     \
407                 "Group Descriptor # %llu has bad signature %.*s",       \
408                 (unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \
409                 (____gd)->bg_signature);                                \
410 } while (0)
411
412 static inline unsigned long ino_from_blkno(struct super_block *sb,
413                                            u64 blkno)
414 {
415         return (unsigned long)(blkno & (u64)ULONG_MAX);
416 }
417
418 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
419                                            u32 clusters)
420 {
421         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
422                 sb->s_blocksize_bits;
423
424         return (u64)clusters << c_to_b_bits;
425 }
426
427 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
428                                            u64 blocks)
429 {
430         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
431                 sb->s_blocksize_bits;
432
433         return (u32)(blocks >> b_to_c_bits);
434 }
435
436 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
437                                                     u64 bytes)
438 {
439         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
440         unsigned int clusters;
441
442         bytes += OCFS2_SB(sb)->s_clustersize - 1;
443         /* OCFS2 just cannot have enough clusters to overflow this */
444         clusters = (unsigned int)(bytes >> cl_bits);
445
446         return clusters;
447 }
448
449 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
450                                          u64 bytes)
451 {
452         bytes += sb->s_blocksize - 1;
453         return bytes >> sb->s_blocksize_bits;
454 }
455
456 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
457                                           u32 clusters)
458 {
459         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
460 }
461
462 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
463                                                 u64 bytes)
464 {
465         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
466         unsigned int clusters;
467
468         clusters = ocfs2_clusters_for_bytes(sb, bytes);
469         return (u64)clusters << cl_bits;
470 }
471
472 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
473                                               u64 bytes)
474 {
475         u64 blocks;
476
477         blocks = ocfs2_blocks_for_bytes(sb, bytes);
478         return blocks << sb->s_blocksize_bits;
479 }
480
481 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
482 {
483         return (unsigned long)((bytes + 511) >> 9);
484 }
485
486 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
487                                                         unsigned long pg_index)
488 {
489         u32 clusters = pg_index;
490         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
491
492         if (unlikely(PAGE_CACHE_SHIFT > cbits))
493                 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
494         else if (PAGE_CACHE_SHIFT < cbits)
495                 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
496
497         return clusters;
498 }
499
500 /*
501  * Find the 1st page index which covers the given clusters.
502  */
503 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
504                                                         u32 clusters)
505 {
506         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
507         pgoff_t index = clusters;
508
509         if (PAGE_CACHE_SHIFT > cbits) {
510                 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
511         } else if (PAGE_CACHE_SHIFT < cbits) {
512                 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
513         }
514
515         return index;
516 }
517
518 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
519 {
520         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
521         unsigned int pages_per_cluster = 1;
522
523         if (PAGE_CACHE_SHIFT < cbits)
524                 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
525
526         return pages_per_cluster;
527 }
528
529 #define ocfs2_set_bit ext2_set_bit
530 #define ocfs2_clear_bit ext2_clear_bit
531 #define ocfs2_test_bit ext2_test_bit
532 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
533 #endif  /* OCFS2_H */
534