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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/ocfs2.h

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  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 };
283 
284 #define OCFS2_OSB_SOFT_RO       0x0001
285 #define OCFS2_OSB_HARD_RO       0x0002
286 #define OCFS2_OSB_ERROR_FS      0x0004
287 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
288 
289 struct ocfs2_journal;
290 struct ocfs2_slot_info;
291 struct ocfs2_recovery_map;
292 struct ocfs2_replay_map;
293 struct ocfs2_quota_recovery;
294 struct ocfs2_super
295 {
296         struct task_struct *commit_task;
297         struct super_block *sb;
298         struct inode *root_inode;
299         struct inode *sys_root_inode;
300         struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
301         struct inode **local_system_inodes;
302 
303         struct ocfs2_slot_info *slot_info;
304 
305         u32 *slot_recovery_generations;
306 
307         spinlock_t node_map_lock;
308 
309         u64 root_blkno;
310         u64 system_dir_blkno;
311         u64 bitmap_blkno;
312         u32 bitmap_cpg;
313         char *uuid_str;
314         u32 uuid_hash;
315         u8 *vol_label;
316         u64 first_cluster_group_blkno;
317         u32 fs_generation;
318 
319         u32 s_feature_compat;
320         u32 s_feature_incompat;
321         u32 s_feature_ro_compat;
322 
323         /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
324          * Could protect more on osb as it's very short lived.
325          */
326         spinlock_t osb_lock;
327         u32 s_next_generation;
328         unsigned long osb_flags;
329         s16 s_inode_steal_slot;
330         s16 s_meta_steal_slot;
331         atomic_t s_num_inodes_stolen;
332         atomic_t s_num_meta_stolen;
333 
334         unsigned long s_mount_opt;
335         unsigned int s_atime_quantum;
336 
337         unsigned int max_slots;
338         unsigned int node_num;
339         int slot_num;
340         int preferred_slot;
341         int s_sectsize_bits;
342         int s_clustersize;
343         int s_clustersize_bits;
344         unsigned int s_xattr_inline_size;
345 
346         atomic_t vol_state;
347         struct mutex recovery_lock;
348         struct ocfs2_recovery_map *recovery_map;
349         struct ocfs2_replay_map *replay_map;
350         struct task_struct *recovery_thread_task;
351         int disable_recovery;
352         wait_queue_head_t checkpoint_event;
353         struct ocfs2_journal *journal;
354         unsigned long osb_commit_interval;
355 
356         struct delayed_work             la_enable_wq;
357 
358         /*
359          * Must hold local alloc i_mutex and osb->osb_lock to change
360          * local_alloc_bits. Reads can be done under either lock.
361          */
362         unsigned int local_alloc_bits;
363         unsigned int local_alloc_default_bits;
364         /* osb_clusters_at_boot can become stale! Do not trust it to
365          * be up to date. */
366         unsigned int osb_clusters_at_boot;
367 
368         enum ocfs2_local_alloc_state local_alloc_state; /* protected
369                                                          * by osb_lock */
370 
371         struct buffer_head *local_alloc_bh;
372 
373         u64 la_last_gd;
374 
375         struct ocfs2_reservation_map    osb_la_resmap;
376 
377         unsigned int    osb_resv_level;
378         unsigned int    osb_dir_resv_level;
379 
380         /* Next two fields are for local node slot recovery during
381          * mount. */
382         struct ocfs2_dinode *local_alloc_copy;
383         struct ocfs2_quota_recovery *quota_rec;
384 
385         struct ocfs2_blockcheck_stats osb_ecc_stats;
386         struct ocfs2_alloc_stats alloc_stats;
387         char dev_str[20];               /* "major,minor" of the device */
388 
389         u8 osb_stackflags;
390 
391         char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
392         char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
393         struct ocfs2_cluster_connection *cconn;
394         struct ocfs2_lock_res osb_super_lockres;
395         struct ocfs2_lock_res osb_rename_lockres;
396         struct ocfs2_lock_res osb_nfs_sync_lockres;
397         struct ocfs2_lock_res osb_trim_fs_lockres;
398         struct mutex obs_trim_fs_mutex;
399         struct ocfs2_dlm_debug *osb_dlm_debug;
400 
401         struct dentry *osb_debug_root;
402 
403         wait_queue_head_t recovery_event;
404 
405         spinlock_t dc_task_lock;
406         struct task_struct *dc_task;
407         wait_queue_head_t dc_event;
408         unsigned long dc_wake_sequence;
409         unsigned long dc_work_sequence;
410 
411         /*
412          * Any thread can add locks to the list, but the downconvert
413          * thread is the only one allowed to remove locks. Any change
414          * to this rule requires updating
415          * ocfs2_downconvert_thread_do_work().
416          */
417         struct list_head blocked_lock_list;
418         unsigned long blocked_lock_count;
419 
420         /* List of dquot structures to drop last reference to */
421         struct llist_head dquot_drop_list;
422         struct work_struct dquot_drop_work;
423 
424         wait_queue_head_t               osb_mount_event;
425 
426         /* Truncate log info */
427         struct inode                    *osb_tl_inode;
428         struct buffer_head              *osb_tl_bh;
429         struct delayed_work             osb_truncate_log_wq;
430         atomic_t                        osb_tl_disable;
431         /*
432          * How many clusters in our truncate log.
433          * It must be protected by osb_tl_inode->i_mutex.
434          */
435         unsigned int truncated_clusters;
436 
437         struct ocfs2_node_map           osb_recovering_orphan_dirs;
438         unsigned int                    *osb_orphan_wipes;
439         wait_queue_head_t               osb_wipe_event;
440 
441         struct ocfs2_orphan_scan        osb_orphan_scan;
442 
443         /* used to protect metaecc calculation check of xattr. */
444         spinlock_t osb_xattr_lock;
445 
446         unsigned int                    osb_dx_mask;
447         u32                             osb_dx_seed[4];
448 
449         /* the group we used to allocate inodes. */
450         u64                             osb_inode_alloc_group;
451 
452         /* rb tree root for refcount lock. */
453         struct rb_root  osb_rf_lock_tree;
454         struct ocfs2_refcount_tree *osb_ref_tree_lru;
455 
456         struct mutex system_file_mutex;
457 
458         /*
459          * OCFS2 needs to schedule several different types of work which
460          * require cluster locking, disk I/O, recovery waits, etc. Since these
461          * types of work tend to be heavy we avoid using the kernel events
462          * workqueue and schedule on our own.
463          */
464         struct workqueue_struct *ocfs2_wq;
465 
466         /* sysfs directory per partition */
467         struct kset *osb_dev_kset;
468 
469         /* file check related stuff */
470         struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
471 };
472 
473 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
474 
475 /* Useful typedef for passing around journal access functions */
476 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
477                                          struct ocfs2_caching_info *ci,
478                                          struct buffer_head *bh, int type);
479 
480 static inline int ocfs2_should_order_data(struct inode *inode)
481 {
482         if (!S_ISREG(inode->i_mode))
483                 return 0;
484         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
485                 return 0;
486         return 1;
487 }
488 
489 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
490 {
491         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
492                 return 1;
493         return 0;
494 }
495 
496 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
497 {
498         /*
499          * Support for sparse files is a pre-requisite
500          */
501         if (!ocfs2_sparse_alloc(osb))
502                 return 0;
503 
504         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
505                 return 1;
506         return 0;
507 }
508 
509 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
510 {
511         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
512                 return 1;
513         return 0;
514 }
515 
516 
517 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
518 {
519         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
520                 return 1;
521         return 0;
522 }
523 
524 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
525 {
526         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
527                 return 1;
528         return 0;
529 }
530 
531 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
532 {
533         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
534                 return 1;
535         return 0;
536 }
537 
538 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
539 {
540         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
541                 return 1;
542         return 0;
543 }
544 
545 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
546 {
547         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
548                 return 1;
549         return 0;
550 }
551 
552 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
553 {
554         if (ocfs2_supports_indexed_dirs(osb))
555                 return OCFS2_DX_LINK_MAX;
556         return OCFS2_LINK_MAX;
557 }
558 
559 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
560 {
561         u32 nlink = le16_to_cpu(di->i_links_count);
562         u32 hi = le16_to_cpu(di->i_links_count_hi);
563 
564         if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
565                 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
566 
567         return nlink;
568 }
569 
570 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
571 {
572         u16 lo, hi;
573 
574         lo = nlink;
575         hi = nlink >> OCFS2_LINKS_HI_SHIFT;
576 
577         di->i_links_count = cpu_to_le16(lo);
578         di->i_links_count_hi = cpu_to_le16(hi);
579 }
580 
581 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
582 {
583         u32 links = ocfs2_read_links_count(di);
584 
585         links += n;
586 
587         ocfs2_set_links_count(di, links);
588 }
589 
590 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
591 {
592         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
593                 return 1;
594         return 0;
595 }
596 
597 /* set / clear functions because cluster events can make these happen
598  * in parallel so we want the transitions to be atomic. this also
599  * means that any future flags osb_flags must be protected by spinlock
600  * too! */
601 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
602                                       unsigned long flag)
603 {
604         spin_lock(&osb->osb_lock);
605         osb->osb_flags |= flag;
606         spin_unlock(&osb->osb_lock);
607 }
608 
609 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
610                                      int hard)
611 {
612         spin_lock(&osb->osb_lock);
613         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
614         if (hard)
615                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
616         else
617                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
618         spin_unlock(&osb->osb_lock);
619 }
620 
621 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
622 {
623         int ret;
624 
625         spin_lock(&osb->osb_lock);
626         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
627         spin_unlock(&osb->osb_lock);
628 
629         return ret;
630 }
631 
632 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
633 {
634         int ret;
635 
636         spin_lock(&osb->osb_lock);
637         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
638         spin_unlock(&osb->osb_lock);
639 
640         return ret;
641 }
642 
643 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
644 {
645         return (osb->s_feature_incompat &
646                 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
647                  OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
648 }
649 
650 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
651 {
652         if (ocfs2_clusterinfo_valid(osb) &&
653             memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
654                    OCFS2_STACK_LABEL_LEN))
655                 return 1;
656         return 0;
657 }
658 
659 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
660 {
661         if (ocfs2_clusterinfo_valid(osb) &&
662             !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
663                    OCFS2_STACK_LABEL_LEN))
664                 return 1;
665         return 0;
666 }
667 
668 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
669 {
670         return ocfs2_o2cb_stack(osb) &&
671                 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
672 }
673 
674 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
675 {
676         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
677 }
678 
679 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
680 {
681         return (osb->s_feature_incompat &
682                 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
683 }
684 
685 
686 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
687         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
688 
689 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
690         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
691 
692 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
693         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
694 
695 
696 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)                                 \
697         (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
698 
699 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)                                 \
700         (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
701 
702 #define OCFS2_IS_VALID_DX_ROOT(ptr)                                     \
703         (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
704 
705 #define OCFS2_IS_VALID_DX_LEAF(ptr)                                     \
706         (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
707 
708 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)                              \
709         (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
710 
711 static inline unsigned long ino_from_blkno(struct super_block *sb,
712                                            u64 blkno)
713 {
714         return (unsigned long)(blkno & (u64)ULONG_MAX);
715 }
716 
717 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
718                                            u32 clusters)
719 {
720         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
721                 sb->s_blocksize_bits;
722 
723         return (u64)clusters << c_to_b_bits;
724 }
725 
726 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb,
727                 u64 blocks)
728 {
729         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
730                         sb->s_blocksize_bits;
731 
732         blocks += (1 << b_to_c_bits) - 1;
733         return (u32)(blocks >> b_to_c_bits);
734 }
735 
736 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
737                                            u64 blocks)
738 {
739         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
740                 sb->s_blocksize_bits;
741 
742         return (u32)(blocks >> b_to_c_bits);
743 }
744 
745 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
746                                                     u64 bytes)
747 {
748         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
749         unsigned int clusters;
750 
751         bytes += OCFS2_SB(sb)->s_clustersize - 1;
752         /* OCFS2 just cannot have enough clusters to overflow this */
753         clusters = (unsigned int)(bytes >> cl_bits);
754 
755         return clusters;
756 }
757 
758 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
759                 u64 bytes)
760 {
761         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
762         unsigned int clusters;
763 
764         clusters = (unsigned int)(bytes >> cl_bits);
765         return clusters;
766 }
767 
768 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
769                                          u64 bytes)
770 {
771         bytes += sb->s_blocksize - 1;
772         return bytes >> sb->s_blocksize_bits;
773 }
774 
775 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
776                                           u32 clusters)
777 {
778         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
779 }
780 
781 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
782                                                u64 blocks)
783 {
784         int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
785         unsigned int clusters;
786 
787         clusters = ocfs2_blocks_to_clusters(sb, blocks);
788         return (u64)clusters << bits;
789 }
790 
791 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
792                                                 u64 bytes)
793 {
794         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
795         unsigned int clusters;
796 
797         clusters = ocfs2_clusters_for_bytes(sb, bytes);
798         return (u64)clusters << cl_bits;
799 }
800 
801 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
802                                               u64 bytes)
803 {
804         u64 blocks;
805 
806         blocks = ocfs2_blocks_for_bytes(sb, bytes);
807         return blocks << sb->s_blocksize_bits;
808 }
809 
810 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
811 {
812         return (unsigned long)((bytes + 511) >> 9);
813 }
814 
815 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
816                                                         unsigned long pg_index)
817 {
818         u32 clusters = pg_index;
819         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
820 
821         if (unlikely(PAGE_SHIFT > cbits))
822                 clusters = pg_index << (PAGE_SHIFT - cbits);
823         else if (PAGE_SHIFT < cbits)
824                 clusters = pg_index >> (cbits - PAGE_SHIFT);
825 
826         return clusters;
827 }
828 
829 /*
830  * Find the 1st page index which covers the given clusters.
831  */
832 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
833                                                         u32 clusters)
834 {
835         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
836         pgoff_t index = clusters;
837 
838         if (PAGE_SHIFT > cbits) {
839                 index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
840         } else if (PAGE_SHIFT < cbits) {
841                 index = (pgoff_t)clusters << (cbits - PAGE_SHIFT);
842         }
843 
844         return index;
845 }
846 
847 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
848 {
849         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
850         unsigned int pages_per_cluster = 1;
851 
852         if (PAGE_SHIFT < cbits)
853                 pages_per_cluster = 1 << (cbits - PAGE_SHIFT);
854 
855         return pages_per_cluster;
856 }
857 
858 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
859                                                        unsigned int megs)
860 {
861         BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
862 
863         return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
864 }
865 
866 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
867                                                        unsigned int clusters)
868 {
869         return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
870 }
871 
872 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
873 {
874         __set_bit_le(bit, bitmap);
875 }
876 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
877 
878 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
879 {
880         __clear_bit_le(bit, bitmap);
881 }
882 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
883 
884 #define ocfs2_test_bit test_bit_le
885 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
886 #define ocfs2_find_next_bit find_next_bit_le
887 
888 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
889 {
890 #if BITS_PER_LONG == 64
891         *bit += ((unsigned long) addr & 7UL) << 3;
892         addr = (void *) ((unsigned long) addr & ~7UL);
893 #elif BITS_PER_LONG == 32
894         *bit += ((unsigned long) addr & 3UL) << 3;
895         addr = (void *) ((unsigned long) addr & ~3UL);
896 #else
897 #error "how many bits you are?!"
898 #endif
899         return addr;
900 }
901 
902 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
903 {
904         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
905         ocfs2_set_bit(bit, bitmap);
906 }
907 
908 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
909 {
910         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
911         ocfs2_clear_bit(bit, bitmap);
912 }
913 
914 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
915 {
916         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
917         return ocfs2_test_bit(bit, bitmap);
918 }
919 
920 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
921                                                         int start)
922 {
923         int fix = 0, ret, tmpmax;
924         bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
925         tmpmax = max + fix;
926         start += fix;
927 
928         ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
929         if (ret > max)
930                 return max;
931         return ret;
932 }
933 
934 #endif  /* OCFS2_H */
935 
936 

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