Merge tag 'dma-mapping-5.12' of git://git.infradead.org/users/hch/dma-mapping
[linux-2.6-microblaze.git] / fs / ocfs2 / ocfs2.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* -*- mode: c; c-basic-offset: 8; -*-
3  * vim: noexpandtab sw=8 ts=8 sts=0:
4  *
5  * ocfs2.h
6  *
7  * Defines macros and structures used in OCFS2
8  *
9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
10  */
11
12 #ifndef OCFS2_H
13 #define OCFS2_H
14
15 #include <linux/spinlock.h>
16 #include <linux/sched.h>
17 #include <linux/wait.h>
18 #include <linux/list.h>
19 #include <linux/llist.h>
20 #include <linux/rbtree.h>
21 #include <linux/workqueue.h>
22 #include <linux/kref.h>
23 #include <linux/mutex.h>
24 #include <linux/lockdep.h>
25 #include <linux/jbd2.h>
26
27 /* For union ocfs2_dlm_lksb */
28 #include "stackglue.h"
29
30 #include "ocfs2_fs.h"
31 #include "ocfs2_lockid.h"
32 #include "ocfs2_ioctl.h"
33
34 /* For struct ocfs2_blockcheck_stats */
35 #include "blockcheck.h"
36
37 #include "reservations.h"
38
39 #include "filecheck.h"
40
41 /* Caching of metadata buffers */
42
43 /* Most user visible OCFS2 inodes will have very few pieces of
44  * metadata, but larger files (including bitmaps, etc) must be taken
45  * into account when designing an access scheme. We allow a small
46  * amount of inlined blocks to be stored on an array and grow the
47  * structure into a rb tree when necessary. */
48 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
49
50 /* Flags for ocfs2_caching_info */
51
52 enum ocfs2_caching_info_flags {
53         /* Indicates that the metadata cache is using the inline array */
54         OCFS2_CACHE_FL_INLINE   = 1<<1,
55 };
56
57 struct ocfs2_caching_operations;
58 struct ocfs2_caching_info {
59         /*
60          * The parent structure provides the locks, but because the
61          * parent structure can differ, it provides locking operations
62          * to struct ocfs2_caching_info.
63          */
64         const struct ocfs2_caching_operations *ci_ops;
65
66         /* next two are protected by trans_inc_lock */
67         /* which transaction were we created on? Zero if none. */
68         unsigned long           ci_created_trans;
69         /* last transaction we were a part of. */
70         unsigned long           ci_last_trans;
71
72         /* Cache structures */
73         unsigned int            ci_flags;
74         unsigned int            ci_num_cached;
75         union {
76         sector_t        ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
77                 struct rb_root  ci_tree;
78         } ci_cache;
79 };
80 /*
81  * Need this prototype here instead of in uptodate.h because journal.h
82  * uses it.
83  */
84 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
85
86 /* this limits us to 256 nodes
87  * if we need more, we can do a kmalloc for the map */
88 #define OCFS2_NODE_MAP_MAX_NODES    256
89 struct ocfs2_node_map {
90         u16 num_nodes;
91         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
92 };
93
94 enum ocfs2_ast_action {
95         OCFS2_AST_INVALID = 0,
96         OCFS2_AST_ATTACH,
97         OCFS2_AST_CONVERT,
98         OCFS2_AST_DOWNCONVERT,
99 };
100
101 /* actions for an unlockast function to take. */
102 enum ocfs2_unlock_action {
103         OCFS2_UNLOCK_INVALID = 0,
104         OCFS2_UNLOCK_CANCEL_CONVERT,
105         OCFS2_UNLOCK_DROP_LOCK,
106 };
107
108 /* ocfs2_lock_res->l_flags flags. */
109 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* we have initialized
110                                                * the lvb */
111 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
112                                                * dlm_lock */
113 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
114                                                * downconvert*/
115 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
116 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
117 #define OCFS2_LOCK_REFRESHING    (0x00000020)
118 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
119                                                * for shutdown paths */
120 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
121                                                * when to skip queueing
122                                                * a lock because it's
123                                                * about to be
124                                                * dropped. */
125 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
126 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
127 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
128                                                  call to dlm_lock.  Only
129                                                  exists with BUSY set. */
130 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
131                                                      * from downconverting
132                                                      * before the upconvert
133                                                      * has completed */
134
135 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
136                                                    * lock has already
137                                                    * returned, do not block
138                                                    * dc thread from
139                                                    * downconverting */
140
141 struct ocfs2_lock_res_ops;
142
143 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
144
145 #ifdef CONFIG_OCFS2_FS_STATS
146 struct ocfs2_lock_stats {
147         u64             ls_total;       /* Total wait in NSEC */
148         u32             ls_gets;        /* Num acquires */
149         u32             ls_fail;        /* Num failed acquires */
150
151         /* Storing max wait in usecs saves 24 bytes per inode */
152         u32             ls_max;         /* Max wait in USEC */
153         u64             ls_last;        /* Last unlock time in USEC */
154 };
155 #endif
156
157 struct ocfs2_lock_res {
158         void                    *l_priv;
159         struct ocfs2_lock_res_ops *l_ops;
160
161
162         struct list_head         l_blocked_list;
163         struct list_head         l_mask_waiters;
164         struct list_head         l_holders;
165
166         unsigned long            l_flags;
167         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
168         unsigned int             l_ro_holders;
169         unsigned int             l_ex_holders;
170         signed char              l_level;
171         signed char              l_requested;
172         signed char              l_blocking;
173
174         /* Data packed - type enum ocfs2_lock_type */
175         unsigned char            l_type;
176
177         /* used from AST/BAST funcs. */
178         /* Data packed - enum type ocfs2_ast_action */
179         unsigned char            l_action;
180         /* Data packed - enum type ocfs2_unlock_action */
181         unsigned char            l_unlock_action;
182         unsigned int             l_pending_gen;
183
184         spinlock_t               l_lock;
185
186         struct ocfs2_dlm_lksb    l_lksb;
187
188         wait_queue_head_t        l_event;
189
190         struct list_head         l_debug_list;
191
192 #ifdef CONFIG_OCFS2_FS_STATS
193         struct ocfs2_lock_stats  l_lock_prmode;         /* PR mode stats */
194         u32                      l_lock_refresh;        /* Disk refreshes */
195         u64                      l_lock_wait;   /* First lock wait time */
196         struct ocfs2_lock_stats  l_lock_exmode;         /* EX mode stats */
197 #endif
198 #ifdef CONFIG_DEBUG_LOCK_ALLOC
199         struct lockdep_map       l_lockdep_map;
200 #endif
201 };
202
203 enum ocfs2_orphan_reco_type {
204         ORPHAN_NO_NEED_TRUNCATE = 0,
205         ORPHAN_NEED_TRUNCATE,
206 };
207
208 enum ocfs2_orphan_scan_state {
209         ORPHAN_SCAN_ACTIVE,
210         ORPHAN_SCAN_INACTIVE
211 };
212
213 struct ocfs2_orphan_scan {
214         struct mutex            os_lock;
215         struct ocfs2_super      *os_osb;
216         struct ocfs2_lock_res   os_lockres;     /* lock to synchronize scans */
217         struct delayed_work     os_orphan_scan_work;
218         time64_t                os_scantime;  /* time this node ran the scan */
219         u32                     os_count;      /* tracks node specific scans */
220         u32                     os_seqno;       /* tracks cluster wide scans */
221         atomic_t                os_state;              /* ACTIVE or INACTIVE */
222 };
223
224 struct ocfs2_dlm_debug {
225         struct kref d_refcnt;
226         u32 d_filter_secs;
227         struct list_head d_lockres_tracking;
228 };
229
230 enum ocfs2_vol_state
231 {
232         VOLUME_INIT = 0,
233         VOLUME_MOUNTED,
234         VOLUME_MOUNTED_QUOTAS,
235         VOLUME_DISMOUNTED,
236         VOLUME_DISABLED
237 };
238
239 struct ocfs2_alloc_stats
240 {
241         atomic_t moves;
242         atomic_t local_data;
243         atomic_t bitmap_data;
244         atomic_t bg_allocs;
245         atomic_t bg_extends;
246 };
247
248 enum ocfs2_local_alloc_state
249 {
250         OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
251                                  * this mountpoint. */
252         OCFS2_LA_ENABLED,       /* Local alloc is in use. */
253         OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
254                                  * of bits has been reduced. */
255         OCFS2_LA_DISABLED       /* Local alloc has temporarily been
256                                  * disabled. */
257 };
258
259 enum ocfs2_mount_options
260 {
261         OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
262         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
263         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
264         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
265         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
266         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
267         OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
268         OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
269         OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
270         OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,      /* Disable POSIX access
271                                                    control lists */
272         OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
273         OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
274         OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
275                                                      writes */
276         OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
277         OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
278
279         OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
280         OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
281         OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
282         OCFS2_MOUNT_NOCLUSTER = 1 << 18, /* No cluster aware filesystem mount */
283 };
284
285 #define OCFS2_OSB_SOFT_RO       0x0001
286 #define OCFS2_OSB_HARD_RO       0x0002
287 #define OCFS2_OSB_ERROR_FS      0x0004
288 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
289
290 struct ocfs2_journal;
291 struct ocfs2_slot_info;
292 struct ocfs2_recovery_map;
293 struct ocfs2_replay_map;
294 struct ocfs2_quota_recovery;
295 struct ocfs2_super
296 {
297         struct task_struct *commit_task;
298         struct super_block *sb;
299         struct inode *root_inode;
300         struct inode *sys_root_inode;
301         struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
302         struct inode **local_system_inodes;
303
304         struct ocfs2_slot_info *slot_info;
305
306         u32 *slot_recovery_generations;
307
308         spinlock_t node_map_lock;
309
310         u64 root_blkno;
311         u64 system_dir_blkno;
312         u64 bitmap_blkno;
313         u32 bitmap_cpg;
314         char *uuid_str;
315         u32 uuid_hash;
316         u8 *vol_label;
317         u64 first_cluster_group_blkno;
318         u32 fs_generation;
319
320         u32 s_feature_compat;
321         u32 s_feature_incompat;
322         u32 s_feature_ro_compat;
323
324         /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
325          * Could protect more on osb as it's very short lived.
326          */
327         spinlock_t osb_lock;
328         u32 s_next_generation;
329         unsigned long osb_flags;
330         u16 s_inode_steal_slot;
331         u16 s_meta_steal_slot;
332         atomic_t s_num_inodes_stolen;
333         atomic_t s_num_meta_stolen;
334
335         unsigned long s_mount_opt;
336         unsigned int s_atime_quantum;
337
338         unsigned int max_slots;
339         unsigned int node_num;
340         int slot_num;
341         int preferred_slot;
342         int s_sectsize_bits;
343         int s_clustersize;
344         int s_clustersize_bits;
345         unsigned int s_xattr_inline_size;
346
347         atomic_t vol_state;
348         struct mutex recovery_lock;
349         struct ocfs2_recovery_map *recovery_map;
350         struct ocfs2_replay_map *replay_map;
351         struct task_struct *recovery_thread_task;
352         int disable_recovery;
353         wait_queue_head_t checkpoint_event;
354         struct ocfs2_journal *journal;
355         unsigned long osb_commit_interval;
356
357         struct delayed_work             la_enable_wq;
358
359         /*
360          * Must hold local alloc i_mutex and osb->osb_lock to change
361          * local_alloc_bits. Reads can be done under either lock.
362          */
363         unsigned int local_alloc_bits;
364         unsigned int local_alloc_default_bits;
365         /* osb_clusters_at_boot can become stale! Do not trust it to
366          * be up to date. */
367         unsigned int osb_clusters_at_boot;
368
369         enum ocfs2_local_alloc_state local_alloc_state; /* protected
370                                                          * by osb_lock */
371
372         struct buffer_head *local_alloc_bh;
373
374         u64 la_last_gd;
375
376         struct ocfs2_reservation_map    osb_la_resmap;
377
378         unsigned int    osb_resv_level;
379         unsigned int    osb_dir_resv_level;
380
381         /* Next two fields are for local node slot recovery during
382          * mount. */
383         struct ocfs2_dinode *local_alloc_copy;
384         struct ocfs2_quota_recovery *quota_rec;
385
386         struct ocfs2_blockcheck_stats osb_ecc_stats;
387         struct ocfs2_alloc_stats alloc_stats;
388         char dev_str[20];               /* "major,minor" of the device */
389
390         u8 osb_stackflags;
391
392         char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
393         char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
394         struct ocfs2_cluster_connection *cconn;
395         struct ocfs2_lock_res osb_super_lockres;
396         struct ocfs2_lock_res osb_rename_lockres;
397         struct ocfs2_lock_res osb_nfs_sync_lockres;
398         struct rw_semaphore nfs_sync_rwlock;
399         struct ocfs2_lock_res osb_trim_fs_lockres;
400         struct mutex obs_trim_fs_mutex;
401         struct ocfs2_dlm_debug *osb_dlm_debug;
402
403         struct dentry *osb_debug_root;
404
405         wait_queue_head_t recovery_event;
406
407         spinlock_t dc_task_lock;
408         struct task_struct *dc_task;
409         wait_queue_head_t dc_event;
410         unsigned long dc_wake_sequence;
411         unsigned long dc_work_sequence;
412
413         /*
414          * Any thread can add locks to the list, but the downconvert
415          * thread is the only one allowed to remove locks. Any change
416          * to this rule requires updating
417          * ocfs2_downconvert_thread_do_work().
418          */
419         struct list_head blocked_lock_list;
420         unsigned long blocked_lock_count;
421
422         /* List of dquot structures to drop last reference to */
423         struct llist_head dquot_drop_list;
424         struct work_struct dquot_drop_work;
425
426         wait_queue_head_t               osb_mount_event;
427
428         /* Truncate log info */
429         struct inode                    *osb_tl_inode;
430         struct buffer_head              *osb_tl_bh;
431         struct delayed_work             osb_truncate_log_wq;
432         atomic_t                        osb_tl_disable;
433         /*
434          * How many clusters in our truncate log.
435          * It must be protected by osb_tl_inode->i_mutex.
436          */
437         unsigned int truncated_clusters;
438
439         struct ocfs2_node_map           osb_recovering_orphan_dirs;
440         unsigned int                    *osb_orphan_wipes;
441         wait_queue_head_t               osb_wipe_event;
442
443         struct ocfs2_orphan_scan        osb_orphan_scan;
444
445         /* used to protect metaecc calculation check of xattr. */
446         spinlock_t osb_xattr_lock;
447
448         unsigned int                    osb_dx_mask;
449         u32                             osb_dx_seed[4];
450
451         /* the group we used to allocate inodes. */
452         u64                             osb_inode_alloc_group;
453
454         /* rb tree root for refcount lock. */
455         struct rb_root  osb_rf_lock_tree;
456         struct ocfs2_refcount_tree *osb_ref_tree_lru;
457
458         struct mutex system_file_mutex;
459
460         /*
461          * OCFS2 needs to schedule several different types of work which
462          * require cluster locking, disk I/O, recovery waits, etc. Since these
463          * types of work tend to be heavy we avoid using the kernel events
464          * workqueue and schedule on our own.
465          */
466         struct workqueue_struct *ocfs2_wq;
467
468         /* sysfs directory per partition */
469         struct kset *osb_dev_kset;
470
471         /* file check related stuff */
472         struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
473 };
474
475 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
476
477 /* Useful typedef for passing around journal access functions */
478 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
479                                          struct ocfs2_caching_info *ci,
480                                          struct buffer_head *bh, int type);
481
482 static inline int ocfs2_should_order_data(struct inode *inode)
483 {
484         if (!S_ISREG(inode->i_mode))
485                 return 0;
486         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
487                 return 0;
488         return 1;
489 }
490
491 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
492 {
493         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
494                 return 1;
495         return 0;
496 }
497
498 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
499 {
500         /*
501          * Support for sparse files is a pre-requisite
502          */
503         if (!ocfs2_sparse_alloc(osb))
504                 return 0;
505
506         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
507                 return 1;
508         return 0;
509 }
510
511 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
512 {
513         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
514                 return 1;
515         return 0;
516 }
517
518
519 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
520 {
521         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
522                 return 1;
523         return 0;
524 }
525
526 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
527 {
528         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
529                 return 1;
530         return 0;
531 }
532
533 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
534 {
535         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
536                 return 1;
537         return 0;
538 }
539
540 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
541 {
542         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
543                 return 1;
544         return 0;
545 }
546
547 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
548 {
549         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
550                 return 1;
551         return 0;
552 }
553
554 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
555 {
556         if (ocfs2_supports_indexed_dirs(osb))
557                 return OCFS2_DX_LINK_MAX;
558         return OCFS2_LINK_MAX;
559 }
560
561 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
562 {
563         u32 nlink = le16_to_cpu(di->i_links_count);
564         u32 hi = le16_to_cpu(di->i_links_count_hi);
565
566         if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
567                 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
568
569         return nlink;
570 }
571
572 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
573 {
574         u16 lo, hi;
575
576         lo = nlink;
577         hi = nlink >> OCFS2_LINKS_HI_SHIFT;
578
579         di->i_links_count = cpu_to_le16(lo);
580         di->i_links_count_hi = cpu_to_le16(hi);
581 }
582
583 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
584 {
585         u32 links = ocfs2_read_links_count(di);
586
587         links += n;
588
589         ocfs2_set_links_count(di, links);
590 }
591
592 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
593 {
594         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
595                 return 1;
596         return 0;
597 }
598
599 /* set / clear functions because cluster events can make these happen
600  * in parallel so we want the transitions to be atomic. this also
601  * means that any future flags osb_flags must be protected by spinlock
602  * too! */
603 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
604                                       unsigned long flag)
605 {
606         spin_lock(&osb->osb_lock);
607         osb->osb_flags |= flag;
608         spin_unlock(&osb->osb_lock);
609 }
610
611 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
612                                      int hard)
613 {
614         spin_lock(&osb->osb_lock);
615         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
616         if (hard)
617                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
618         else
619                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
620         spin_unlock(&osb->osb_lock);
621 }
622
623 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
624 {
625         int ret;
626
627         spin_lock(&osb->osb_lock);
628         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
629         spin_unlock(&osb->osb_lock);
630
631         return ret;
632 }
633
634 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
635 {
636         int ret;
637
638         spin_lock(&osb->osb_lock);
639         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
640         spin_unlock(&osb->osb_lock);
641
642         return ret;
643 }
644
645 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
646 {
647         return (osb->s_feature_incompat &
648                 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
649                  OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
650 }
651
652 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
653 {
654         if (ocfs2_clusterinfo_valid(osb) &&
655             memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
656                    OCFS2_STACK_LABEL_LEN))
657                 return 1;
658         return 0;
659 }
660
661 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
662 {
663         if (ocfs2_clusterinfo_valid(osb) &&
664             !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
665                    OCFS2_STACK_LABEL_LEN))
666                 return 1;
667         return 0;
668 }
669
670 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
671 {
672         return ocfs2_o2cb_stack(osb) &&
673                 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
674 }
675
676 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
677 {
678         return ((osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT)
679                 || (osb->s_mount_opt & OCFS2_MOUNT_NOCLUSTER));
680 }
681
682 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
683 {
684         return (osb->s_feature_incompat &
685                 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
686 }
687
688
689 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
690         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
691
692 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
693         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
694
695 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
696         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
697
698
699 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)                                 \
700         (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
701
702 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)                                 \
703         (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
704
705 #define OCFS2_IS_VALID_DX_ROOT(ptr)                                     \
706         (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
707
708 #define OCFS2_IS_VALID_DX_LEAF(ptr)                                     \
709         (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
710
711 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)                              \
712         (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
713
714 static inline unsigned long ino_from_blkno(struct super_block *sb,
715                                            u64 blkno)
716 {
717         return (unsigned long)(blkno & (u64)ULONG_MAX);
718 }
719
720 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
721                                            u32 clusters)
722 {
723         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
724                 sb->s_blocksize_bits;
725
726         return (u64)clusters << c_to_b_bits;
727 }
728
729 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb,
730                 u64 blocks)
731 {
732         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
733                         sb->s_blocksize_bits;
734
735         blocks += (1 << b_to_c_bits) - 1;
736         return (u32)(blocks >> b_to_c_bits);
737 }
738
739 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
740                                            u64 blocks)
741 {
742         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
743                 sb->s_blocksize_bits;
744
745         return (u32)(blocks >> b_to_c_bits);
746 }
747
748 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
749                                                     u64 bytes)
750 {
751         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
752         unsigned int clusters;
753
754         bytes += OCFS2_SB(sb)->s_clustersize - 1;
755         /* OCFS2 just cannot have enough clusters to overflow this */
756         clusters = (unsigned int)(bytes >> cl_bits);
757
758         return clusters;
759 }
760
761 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
762                 u64 bytes)
763 {
764         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
765         unsigned int clusters;
766
767         clusters = (unsigned int)(bytes >> cl_bits);
768         return clusters;
769 }
770
771 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
772                                          u64 bytes)
773 {
774         bytes += sb->s_blocksize - 1;
775         return bytes >> sb->s_blocksize_bits;
776 }
777
778 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
779                                           u32 clusters)
780 {
781         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
782 }
783
784 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
785                                                u64 blocks)
786 {
787         int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
788         unsigned int clusters;
789
790         clusters = ocfs2_blocks_to_clusters(sb, blocks);
791         return (u64)clusters << bits;
792 }
793
794 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
795                                                 u64 bytes)
796 {
797         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
798         unsigned int clusters;
799
800         clusters = ocfs2_clusters_for_bytes(sb, bytes);
801         return (u64)clusters << cl_bits;
802 }
803
804 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
805                                               u64 bytes)
806 {
807         u64 blocks;
808
809         blocks = ocfs2_blocks_for_bytes(sb, bytes);
810         return blocks << sb->s_blocksize_bits;
811 }
812
813 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
814 {
815         return (unsigned long)((bytes + 511) >> 9);
816 }
817
818 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
819                                                         unsigned long pg_index)
820 {
821         u32 clusters = pg_index;
822         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
823
824         if (unlikely(PAGE_SHIFT > cbits))
825                 clusters = pg_index << (PAGE_SHIFT - cbits);
826         else if (PAGE_SHIFT < cbits)
827                 clusters = pg_index >> (cbits - PAGE_SHIFT);
828
829         return clusters;
830 }
831
832 /*
833  * Find the 1st page index which covers the given clusters.
834  */
835 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
836                                                         u32 clusters)
837 {
838         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
839         pgoff_t index = clusters;
840
841         if (PAGE_SHIFT > cbits) {
842                 index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
843         } else if (PAGE_SHIFT < cbits) {
844                 index = (pgoff_t)clusters << (cbits - PAGE_SHIFT);
845         }
846
847         return index;
848 }
849
850 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
851 {
852         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
853         unsigned int pages_per_cluster = 1;
854
855         if (PAGE_SHIFT < cbits)
856                 pages_per_cluster = 1 << (cbits - PAGE_SHIFT);
857
858         return pages_per_cluster;
859 }
860
861 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
862                                                        unsigned int megs)
863 {
864         BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
865
866         return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
867 }
868
869 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
870                                                        unsigned int clusters)
871 {
872         return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
873 }
874
875 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
876 {
877         __set_bit_le(bit, bitmap);
878 }
879 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
880
881 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
882 {
883         __clear_bit_le(bit, bitmap);
884 }
885 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
886
887 #define ocfs2_test_bit test_bit_le
888 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
889 #define ocfs2_find_next_bit find_next_bit_le
890
891 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
892 {
893 #if BITS_PER_LONG == 64
894         *bit += ((unsigned long) addr & 7UL) << 3;
895         addr = (void *) ((unsigned long) addr & ~7UL);
896 #elif BITS_PER_LONG == 32
897         *bit += ((unsigned long) addr & 3UL) << 3;
898         addr = (void *) ((unsigned long) addr & ~3UL);
899 #else
900 #error "how many bits you are?!"
901 #endif
902         return addr;
903 }
904
905 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
906 {
907         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
908         ocfs2_set_bit(bit, bitmap);
909 }
910
911 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
912 {
913         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
914         ocfs2_clear_bit(bit, bitmap);
915 }
916
917 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
918 {
919         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
920         return ocfs2_test_bit(bit, bitmap);
921 }
922
923 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
924                                                         int start)
925 {
926         int fix = 0, ret, tmpmax;
927         bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
928         tmpmax = max + fix;
929         start += fix;
930
931         ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
932         if (ret > max)
933                 return max;
934         return ret;
935 }
936
937 #endif  /* OCFS2_H */
938