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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         struct dentry *d_locking_state;
227         struct dentry *d_locking_filter;
228         u32 d_filter_secs;
229         struct list_head d_lockres_tracking;
230 };
231 
232 enum ocfs2_vol_state
233 {
234         VOLUME_INIT = 0,
235         VOLUME_MOUNTED,
236         VOLUME_MOUNTED_QUOTAS,
237         VOLUME_DISMOUNTED,
238         VOLUME_DISABLED
239 };
240 
241 struct ocfs2_alloc_stats
242 {
243         atomic_t moves;
244         atomic_t local_data;
245         atomic_t bitmap_data;
246         atomic_t bg_allocs;
247         atomic_t bg_extends;
248 };
249 
250 enum ocfs2_local_alloc_state
251 {
252         OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
253                                  * this mountpoint. */
254         OCFS2_LA_ENABLED,       /* Local alloc is in use. */
255         OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
256                                  * of bits has been reduced. */
257         OCFS2_LA_DISABLED       /* Local alloc has temporarily been
258                                  * disabled. */
259 };
260 
261 enum ocfs2_mount_options
262 {
263         OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
264         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
265         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
266         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
267         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
268         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
269         OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
270         OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
271         OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
272         OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,      /* Disable POSIX access
273                                                    control lists */
274         OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
275         OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
276         OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
277                                                      writes */
278         OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
279         OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
280 
281         OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
282         OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
283         OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
284 };
285 
286 #define OCFS2_OSB_SOFT_RO       0x0001
287 #define OCFS2_OSB_HARD_RO       0x0002
288 #define OCFS2_OSB_ERROR_FS      0x0004
289 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
290 
291 struct ocfs2_journal;
292 struct ocfs2_slot_info;
293 struct ocfs2_recovery_map;
294 struct ocfs2_replay_map;
295 struct ocfs2_quota_recovery;
296 struct ocfs2_super
297 {
298         struct task_struct *commit_task;
299         struct super_block *sb;
300         struct inode *root_inode;
301         struct inode *sys_root_inode;
302         struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
303         struct inode **local_system_inodes;
304 
305         struct ocfs2_slot_info *slot_info;
306 
307         u32 *slot_recovery_generations;
308 
309         spinlock_t node_map_lock;
310 
311         u64 root_blkno;
312         u64 system_dir_blkno;
313         u64 bitmap_blkno;
314         u32 bitmap_cpg;
315         char *uuid_str;
316         u32 uuid_hash;
317         u8 *vol_label;
318         u64 first_cluster_group_blkno;
319         u32 fs_generation;
320 
321         u32 s_feature_compat;
322         u32 s_feature_incompat;
323         u32 s_feature_ro_compat;
324 
325         /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
326          * Could protect more on osb as it's very short lived.
327          */
328         spinlock_t osb_lock;
329         u32 s_next_generation;
330         unsigned long osb_flags;
331         s16 s_inode_steal_slot;
332         s16 s_meta_steal_slot;
333         atomic_t s_num_inodes_stolen;
334         atomic_t s_num_meta_stolen;
335 
336         unsigned long s_mount_opt;
337         unsigned int s_atime_quantum;
338 
339         unsigned int max_slots;
340         unsigned int node_num;
341         int slot_num;
342         int preferred_slot;
343         int s_sectsize_bits;
344         int s_clustersize;
345         int s_clustersize_bits;
346         unsigned int s_xattr_inline_size;
347 
348         atomic_t vol_state;
349         struct mutex recovery_lock;
350         struct ocfs2_recovery_map *recovery_map;
351         struct ocfs2_replay_map *replay_map;
352         struct task_struct *recovery_thread_task;
353         int disable_recovery;
354         wait_queue_head_t checkpoint_event;
355         struct ocfs2_journal *journal;
356         unsigned long osb_commit_interval;
357 
358         struct delayed_work             la_enable_wq;
359 
360         /*
361          * Must hold local alloc i_mutex and osb->osb_lock to change
362          * local_alloc_bits. Reads can be done under either lock.
363          */
364         unsigned int local_alloc_bits;
365         unsigned int local_alloc_default_bits;
366         /* osb_clusters_at_boot can become stale! Do not trust it to
367          * be up to date. */
368         unsigned int osb_clusters_at_boot;
369 
370         enum ocfs2_local_alloc_state local_alloc_state; /* protected
371                                                          * by osb_lock */
372 
373         struct buffer_head *local_alloc_bh;
374 
375         u64 la_last_gd;
376 
377         struct ocfs2_reservation_map    osb_la_resmap;
378 
379         unsigned int    osb_resv_level;
380         unsigned int    osb_dir_resv_level;
381 
382         /* Next two fields are for local node slot recovery during
383          * mount. */
384         struct ocfs2_dinode *local_alloc_copy;
385         struct ocfs2_quota_recovery *quota_rec;
386 
387         struct ocfs2_blockcheck_stats osb_ecc_stats;
388         struct ocfs2_alloc_stats alloc_stats;
389         char dev_str[20];               /* "major,minor" of the device */
390 
391         u8 osb_stackflags;
392 
393         char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
394         char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
395         struct ocfs2_cluster_connection *cconn;
396         struct ocfs2_lock_res osb_super_lockres;
397         struct ocfs2_lock_res osb_rename_lockres;
398         struct ocfs2_lock_res osb_nfs_sync_lockres;
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         struct dentry *osb_ctxt;
405 
406         wait_queue_head_t recovery_event;
407 
408         spinlock_t dc_task_lock;
409         struct task_struct *dc_task;
410         wait_queue_head_t dc_event;
411         unsigned long dc_wake_sequence;
412         unsigned long dc_work_sequence;
413 
414         /*
415          * Any thread can add locks to the list, but the downconvert
416          * thread is the only one allowed to remove locks. Any change
417          * to this rule requires updating
418          * ocfs2_downconvert_thread_do_work().
419          */
420         struct list_head blocked_lock_list;
421         unsigned long blocked_lock_count;
422 
423         /* List of dquot structures to drop last reference to */
424         struct llist_head dquot_drop_list;
425         struct work_struct dquot_drop_work;
426 
427         wait_queue_head_t               osb_mount_event;
428 
429         /* Truncate log info */
430         struct inode                    *osb_tl_inode;
431         struct buffer_head              *osb_tl_bh;
432         struct delayed_work             osb_truncate_log_wq;
433         atomic_t                        osb_tl_disable;
434         /*
435          * How many clusters in our truncate log.
436          * It must be protected by osb_tl_inode->i_mutex.
437          */
438         unsigned int truncated_clusters;
439 
440         struct ocfs2_node_map           osb_recovering_orphan_dirs;
441         unsigned int                    *osb_orphan_wipes;
442         wait_queue_head_t               osb_wipe_event;
443 
444         struct ocfs2_orphan_scan        osb_orphan_scan;
445 
446         /* used to protect metaecc calculation check of xattr. */
447         spinlock_t osb_xattr_lock;
448 
449         unsigned int                    osb_dx_mask;
450         u32                             osb_dx_seed[4];
451 
452         /* the group we used to allocate inodes. */
453         u64                             osb_inode_alloc_group;
454 
455         /* rb tree root for refcount lock. */
456         struct rb_root  osb_rf_lock_tree;
457         struct ocfs2_refcount_tree *osb_ref_tree_lru;
458 
459         struct mutex system_file_mutex;
460 
461         /*
462          * OCFS2 needs to schedule several different types of work which
463          * require cluster locking, disk I/O, recovery waits, etc. Since these
464          * types of work tend to be heavy we avoid using the kernel events
465          * workqueue and schedule on our own.
466          */
467         struct workqueue_struct *ocfs2_wq;
468 
469         /* sysfs directory per partition */
470         struct kset *osb_dev_kset;
471 
472         /* file check related stuff */
473         struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
474 };
475 
476 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
477 
478 /* Useful typedef for passing around journal access functions */
479 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
480                                          struct ocfs2_caching_info *ci,
481                                          struct buffer_head *bh, int type);
482 
483 static inline int ocfs2_should_order_data(struct inode *inode)
484 {
485         if (!S_ISREG(inode->i_mode))
486                 return 0;
487         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
488                 return 0;
489         return 1;
490 }
491 
492 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
493 {
494         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
495                 return 1;
496         return 0;
497 }
498 
499 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
500 {
501         /*
502          * Support for sparse files is a pre-requisite
503          */
504         if (!ocfs2_sparse_alloc(osb))
505                 return 0;
506 
507         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
508                 return 1;
509         return 0;
510 }
511 
512 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
513 {
514         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
515                 return 1;
516         return 0;
517 }
518 
519 
520 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
521 {
522         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
523                 return 1;
524         return 0;
525 }
526 
527 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
528 {
529         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
530                 return 1;
531         return 0;
532 }
533 
534 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
535 {
536         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
537                 return 1;
538         return 0;
539 }
540 
541 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
542 {
543         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
544                 return 1;
545         return 0;
546 }
547 
548 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
549 {
550         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
551                 return 1;
552         return 0;
553 }
554 
555 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
556 {
557         if (ocfs2_supports_indexed_dirs(osb))
558                 return OCFS2_DX_LINK_MAX;
559         return OCFS2_LINK_MAX;
560 }
561 
562 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
563 {
564         u32 nlink = le16_to_cpu(di->i_links_count);
565         u32 hi = le16_to_cpu(di->i_links_count_hi);
566 
567         if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
568                 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
569 
570         return nlink;
571 }
572 
573 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
574 {
575         u16 lo, hi;
576 
577         lo = nlink;
578         hi = nlink >> OCFS2_LINKS_HI_SHIFT;
579 
580         di->i_links_count = cpu_to_le16(lo);
581         di->i_links_count_hi = cpu_to_le16(hi);
582 }
583 
584 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
585 {
586         u32 links = ocfs2_read_links_count(di);
587 
588         links += n;
589 
590         ocfs2_set_links_count(di, links);
591 }
592 
593 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
594 {
595         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
596                 return 1;
597         return 0;
598 }
599 
600 /* set / clear functions because cluster events can make these happen
601  * in parallel so we want the transitions to be atomic. this also
602  * means that any future flags osb_flags must be protected by spinlock
603  * too! */
604 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
605                                       unsigned long flag)
606 {
607         spin_lock(&osb->osb_lock);
608         osb->osb_flags |= flag;
609         spin_unlock(&osb->osb_lock);
610 }
611 
612 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
613                                      int hard)
614 {
615         spin_lock(&osb->osb_lock);
616         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
617         if (hard)
618                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
619         else
620                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
621         spin_unlock(&osb->osb_lock);
622 }
623 
624 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
625 {
626         int ret;
627 
628         spin_lock(&osb->osb_lock);
629         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
630         spin_unlock(&osb->osb_lock);
631 
632         return ret;
633 }
634 
635 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
636 {
637         int ret;
638 
639         spin_lock(&osb->osb_lock);
640         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
641         spin_unlock(&osb->osb_lock);
642 
643         return ret;
644 }
645 
646 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
647 {
648         return (osb->s_feature_incompat &
649                 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
650                  OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
651 }
652 
653 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
654 {
655         if (ocfs2_clusterinfo_valid(osb) &&
656             memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
657                    OCFS2_STACK_LABEL_LEN))
658                 return 1;
659         return 0;
660 }
661 
662 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
663 {
664         if (ocfs2_clusterinfo_valid(osb) &&
665             !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
666                    OCFS2_STACK_LABEL_LEN))
667                 return 1;
668         return 0;
669 }
670 
671 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
672 {
673         return ocfs2_o2cb_stack(osb) &&
674                 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
675 }
676 
677 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
678 {
679         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
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 
939 

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