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