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

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * ocfs2.h
  5  *
  6  * Defines macros and structures used in OCFS2
  7  *
  8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  */
 25 
 26 #ifndef OCFS2_H
 27 #define OCFS2_H
 28 
 29 #include <linux/spinlock.h>
 30 #include <linux/sched.h>
 31 #include <linux/wait.h>
 32 #include <linux/list.h>
 33 #include <linux/rbtree.h>
 34 #include <linux/workqueue.h>
 35 #include <linux/kref.h>
 36 #include <linux/mutex.h>
 37 #include <linux/lockdep.h>
 38 #include <linux/jbd2.h>
 39 
 40 /* For union ocfs2_dlm_lksb */
 41 #include "stackglue.h"
 42 
 43 #include "ocfs2_fs.h"
 44 #include "ocfs2_lockid.h"
 45 #include "ocfs2_ioctl.h"
 46 
 47 /* For struct ocfs2_blockcheck_stats */
 48 #include "blockcheck.h"
 49 
 50 #include "reservations.h"
 51 
 52 /* Caching of metadata buffers */
 53 
 54 /* Most user visible OCFS2 inodes will have very few pieces of
 55  * metadata, but larger files (including bitmaps, etc) must be taken
 56  * into account when designing an access scheme. We allow a small
 57  * amount of inlined blocks to be stored on an array and grow the
 58  * structure into a rb tree when necessary. */
 59 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
 60 
 61 /* Flags for ocfs2_caching_info */
 62 
 63 enum ocfs2_caching_info_flags {
 64         /* Indicates that the metadata cache is using the inline array */
 65         OCFS2_CACHE_FL_INLINE   = 1<<1,
 66 };
 67 
 68 struct ocfs2_caching_operations;
 69 struct ocfs2_caching_info {
 70         /*
 71          * The parent structure provides the locks, but because the
 72          * parent structure can differ, it provides locking operations
 73          * to struct ocfs2_caching_info.
 74          */
 75         const struct ocfs2_caching_operations *ci_ops;
 76 
 77         /* next two are protected by trans_inc_lock */
 78         /* which transaction were we created on? Zero if none. */
 79         unsigned long           ci_created_trans;
 80         /* last transaction we were a part of. */
 81         unsigned long           ci_last_trans;
 82 
 83         /* Cache structures */
 84         unsigned int            ci_flags;
 85         unsigned int            ci_num_cached;
 86         union {
 87         sector_t        ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
 88                 struct rb_root  ci_tree;
 89         } ci_cache;
 90 };
 91 /*
 92  * Need this prototype here instead of in uptodate.h because journal.h
 93  * uses it.
 94  */
 95 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
 96 
 97 /* this limits us to 256 nodes
 98  * if we need more, we can do a kmalloc for the map */
 99 #define OCFS2_NODE_MAP_MAX_NODES    256
100 struct ocfs2_node_map {
101         u16 num_nodes;
102         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
103 };
104 
105 enum ocfs2_ast_action {
106         OCFS2_AST_INVALID = 0,
107         OCFS2_AST_ATTACH,
108         OCFS2_AST_CONVERT,
109         OCFS2_AST_DOWNCONVERT,
110 };
111 
112 /* actions for an unlockast function to take. */
113 enum ocfs2_unlock_action {
114         OCFS2_UNLOCK_INVALID = 0,
115         OCFS2_UNLOCK_CANCEL_CONVERT,
116         OCFS2_UNLOCK_DROP_LOCK,
117 };
118 
119 /* ocfs2_lock_res->l_flags flags. */
120 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* we have initialized
121                                                * the lvb */
122 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
123                                                * dlm_lock */
124 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
125                                                * downconvert*/
126 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
127 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
128 #define OCFS2_LOCK_REFRESHING    (0x00000020)
129 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
130                                                * for shutdown paths */
131 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
132                                                * when to skip queueing
133                                                * a lock because it's
134                                                * about to be
135                                                * dropped. */
136 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
137 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
138 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
139                                                  call to dlm_lock.  Only
140                                                  exists with BUSY set. */
141 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
142                                                      * from downconverting
143                                                      * before the upconvert
144                                                      * has completed */
145 
146 struct ocfs2_lock_res_ops;
147 
148 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
149 
150 #ifdef CONFIG_OCFS2_FS_STATS
151 struct ocfs2_lock_stats {
152         u64             ls_total;       /* Total wait in NSEC */
153         u32             ls_gets;        /* Num acquires */
154         u32             ls_fail;        /* Num failed acquires */
155 
156         /* Storing max wait in usecs saves 24 bytes per inode */
157         u32             ls_max;         /* Max wait in USEC */
158 };
159 #endif
160 
161 struct ocfs2_lock_res {
162         void                    *l_priv;
163         struct ocfs2_lock_res_ops *l_ops;
164 
165 
166         struct list_head         l_blocked_list;
167         struct list_head         l_mask_waiters;
168 
169         unsigned long            l_flags;
170         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
171         unsigned int             l_ro_holders;
172         unsigned int             l_ex_holders;
173         signed char              l_level;
174         signed char              l_requested;
175         signed char              l_blocking;
176 
177         /* Data packed - type enum ocfs2_lock_type */
178         unsigned char            l_type;
179 
180         /* used from AST/BAST funcs. */
181         /* Data packed - enum type ocfs2_ast_action */
182         unsigned char            l_action;
183         /* Data packed - enum type ocfs2_unlock_action */
184         unsigned char            l_unlock_action;
185         unsigned int             l_pending_gen;
186 
187         spinlock_t               l_lock;
188 
189         struct ocfs2_dlm_lksb    l_lksb;
190 
191         wait_queue_head_t        l_event;
192 
193         struct list_head         l_debug_list;
194 
195 #ifdef CONFIG_OCFS2_FS_STATS
196         struct ocfs2_lock_stats  l_lock_prmode;         /* PR mode stats */
197         u32                      l_lock_refresh;        /* Disk refreshes */
198         struct ocfs2_lock_stats  l_lock_exmode;         /* EX mode stats */
199 #endif
200 #ifdef CONFIG_DEBUG_LOCK_ALLOC
201         struct lockdep_map       l_lockdep_map;
202 #endif
203 };
204 
205 enum ocfs2_orphan_scan_state {
206         ORPHAN_SCAN_ACTIVE,
207         ORPHAN_SCAN_INACTIVE
208 };
209 
210 struct ocfs2_orphan_scan {
211         struct mutex            os_lock;
212         struct ocfs2_super      *os_osb;
213         struct ocfs2_lock_res   os_lockres;     /* lock to synchronize scans */
214         struct delayed_work     os_orphan_scan_work;
215         struct timespec         os_scantime;  /* time this node ran the scan */
216         u32                     os_count;      /* tracks node specific scans */
217         u32                     os_seqno;       /* tracks cluster wide scans */
218         atomic_t                os_state;              /* ACTIVE or INACTIVE */
219 };
220 
221 struct ocfs2_dlm_debug {
222         struct kref d_refcnt;
223         struct dentry *d_locking_state;
224         struct list_head d_lockres_tracking;
225 };
226 
227 enum ocfs2_vol_state
228 {
229         VOLUME_INIT = 0,
230         VOLUME_MOUNTED,
231         VOLUME_MOUNTED_QUOTAS,
232         VOLUME_DISMOUNTED,
233         VOLUME_DISABLED
234 };
235 
236 struct ocfs2_alloc_stats
237 {
238         atomic_t moves;
239         atomic_t local_data;
240         atomic_t bitmap_data;
241         atomic_t bg_allocs;
242         atomic_t bg_extends;
243 };
244 
245 enum ocfs2_local_alloc_state
246 {
247         OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
248                                  * this mountpoint. */
249         OCFS2_LA_ENABLED,       /* Local alloc is in use. */
250         OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
251                                  * of bits has been reduced. */
252         OCFS2_LA_DISABLED       /* Local alloc has temporarily been
253                                  * disabled. */
254 };
255 
256 enum ocfs2_mount_options
257 {
258         OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
259         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
260         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
261         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
262         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
263         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
264         OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
265         OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
266         OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
267         OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,      /* Disable POSIX access
268                                                    control lists */
269         OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
270         OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
271         OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
272                                                      writes */
273         OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
274         OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
275 };
276 
277 #define OCFS2_OSB_SOFT_RO                       0x0001
278 #define OCFS2_OSB_HARD_RO                       0x0002
279 #define OCFS2_OSB_ERROR_FS                      0x0004
280 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED        0x0008
281 
282 #define OCFS2_DEFAULT_ATIME_QUANTUM             60
283 
284 struct ocfs2_journal;
285 struct ocfs2_slot_info;
286 struct ocfs2_recovery_map;
287 struct ocfs2_replay_map;
288 struct ocfs2_quota_recovery;
289 struct ocfs2_dentry_lock;
290 struct ocfs2_super
291 {
292         struct task_struct *commit_task;
293         struct super_block *sb;
294         struct inode *root_inode;
295         struct inode *sys_root_inode;
296         struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
297         struct inode **local_system_inodes;
298 
299         struct ocfs2_slot_info *slot_info;
300 
301         u32 *slot_recovery_generations;
302 
303         spinlock_t node_map_lock;
304 
305         u64 root_blkno;
306         u64 system_dir_blkno;
307         u64 bitmap_blkno;
308         u32 bitmap_cpg;
309         u8 *uuid;
310         char *uuid_str;
311         u32 uuid_hash;
312         u8 *vol_label;
313         u64 first_cluster_group_blkno;
314         u32 fs_generation;
315 
316         u32 s_feature_compat;
317         u32 s_feature_incompat;
318         u32 s_feature_ro_compat;
319 
320         /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
321          * Could protect more on osb as it's very short lived.
322          */
323         spinlock_t osb_lock;
324         u32 s_next_generation;
325         unsigned long osb_flags;
326         s16 s_inode_steal_slot;
327         s16 s_meta_steal_slot;
328         atomic_t s_num_inodes_stolen;
329         atomic_t s_num_meta_stolen;
330 
331         unsigned long s_mount_opt;
332         unsigned int s_atime_quantum;
333 
334         unsigned int max_slots;
335         unsigned int node_num;
336         int slot_num;
337         int preferred_slot;
338         int s_sectsize_bits;
339         int s_clustersize;
340         int s_clustersize_bits;
341         unsigned int s_xattr_inline_size;
342 
343         atomic_t vol_state;
344         struct mutex recovery_lock;
345         struct ocfs2_recovery_map *recovery_map;
346         struct ocfs2_replay_map *replay_map;
347         struct task_struct *recovery_thread_task;
348         int disable_recovery;
349         wait_queue_head_t checkpoint_event;
350         atomic_t needs_checkpoint;
351         struct ocfs2_journal *journal;
352         unsigned long osb_commit_interval;
353 
354         struct delayed_work             la_enable_wq;
355 
356         /*
357          * Must hold local alloc i_mutex and osb->osb_lock to change
358          * local_alloc_bits. Reads can be done under either lock.
359          */
360         unsigned int local_alloc_bits;
361         unsigned int local_alloc_default_bits;
362         /* osb_clusters_at_boot can become stale! Do not trust it to
363          * be up to date. */
364         unsigned int osb_clusters_at_boot;
365 
366         enum ocfs2_local_alloc_state local_alloc_state; /* protected
367                                                          * by osb_lock */
368 
369         struct buffer_head *local_alloc_bh;
370 
371         u64 la_last_gd;
372 
373         struct ocfs2_reservation_map    osb_la_resmap;
374 
375         unsigned int    osb_resv_level;
376         unsigned int    osb_dir_resv_level;
377 
378         /* Next three fields are for local node slot recovery during
379          * mount. */
380         int dirty;
381         struct ocfs2_dinode *local_alloc_copy;
382         struct ocfs2_quota_recovery *quota_rec;
383 
384         struct ocfs2_blockcheck_stats osb_ecc_stats;
385         struct ocfs2_alloc_stats alloc_stats;
386         char dev_str[20];               /* "major,minor" of the device */
387 
388         u8 osb_stackflags;
389 
390         char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
391         struct ocfs2_cluster_connection *cconn;
392         struct ocfs2_lock_res osb_super_lockres;
393         struct ocfs2_lock_res osb_rename_lockres;
394         struct ocfs2_lock_res osb_nfs_sync_lockres;
395         struct ocfs2_dlm_debug *osb_dlm_debug;
396 
397         struct dentry *osb_debug_root;
398         struct dentry *osb_ctxt;
399 
400         wait_queue_head_t recovery_event;
401 
402         spinlock_t dc_task_lock;
403         struct task_struct *dc_task;
404         wait_queue_head_t dc_event;
405         unsigned long dc_wake_sequence;
406         unsigned long dc_work_sequence;
407 
408         /*
409          * Any thread can add locks to the list, but the downconvert
410          * thread is the only one allowed to remove locks. Any change
411          * to this rule requires updating
412          * ocfs2_downconvert_thread_do_work().
413          */
414         struct list_head blocked_lock_list;
415         unsigned long blocked_lock_count;
416 
417         /* List of dentry locks to release. Anyone can add locks to
418          * the list, ocfs2_wq processes the list  */
419         struct ocfs2_dentry_lock *dentry_lock_list;
420         struct work_struct dentry_lock_work;
421 
422         wait_queue_head_t               osb_mount_event;
423 
424         /* Truncate log info */
425         struct inode                    *osb_tl_inode;
426         struct buffer_head              *osb_tl_bh;
427         struct delayed_work             osb_truncate_log_wq;
428         /*
429          * How many clusters in our truncate log.
430          * It must be protected by osb_tl_inode->i_mutex.
431          */
432         unsigned int truncated_clusters;
433 
434         struct ocfs2_node_map           osb_recovering_orphan_dirs;
435         unsigned int                    *osb_orphan_wipes;
436         wait_queue_head_t               osb_wipe_event;
437 
438         struct ocfs2_orphan_scan        osb_orphan_scan;
439 
440         /* used to protect metaecc calculation check of xattr. */
441         spinlock_t osb_xattr_lock;
442 
443         unsigned int                    osb_dx_mask;
444         u32                             osb_dx_seed[4];
445 
446         /* the group we used to allocate inodes. */
447         u64                             osb_inode_alloc_group;
448 
449         /* rb tree root for refcount lock. */
450         struct rb_root  osb_rf_lock_tree;
451         struct ocfs2_refcount_tree *osb_ref_tree_lru;
452 };
453 
454 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
455 
456 /* Useful typedef for passing around journal access functions */
457 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
458                                          struct ocfs2_caching_info *ci,
459                                          struct buffer_head *bh, int type);
460 
461 static inline int ocfs2_should_order_data(struct inode *inode)
462 {
463         if (!S_ISREG(inode->i_mode))
464                 return 0;
465         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
466                 return 0;
467         return 1;
468 }
469 
470 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
471 {
472         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
473                 return 1;
474         return 0;
475 }
476 
477 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
478 {
479         /*
480          * Support for sparse files is a pre-requisite
481          */
482         if (!ocfs2_sparse_alloc(osb))
483                 return 0;
484 
485         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
486                 return 1;
487         return 0;
488 }
489 
490 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
491 {
492         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
493                 return 1;
494         return 0;
495 }
496 
497 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
498 {
499         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
500                 return 1;
501         return 0;
502 }
503 
504 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
505 {
506         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
507                 return 1;
508         return 0;
509 }
510 
511 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
512 {
513         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
514                 return 1;
515         return 0;
516 }
517 
518 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
519 {
520         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
521                 return 1;
522         return 0;
523 }
524 
525 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
526 {
527         if (ocfs2_supports_indexed_dirs(osb))
528                 return OCFS2_DX_LINK_MAX;
529         return OCFS2_LINK_MAX;
530 }
531 
532 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
533 {
534         u32 nlink = le16_to_cpu(di->i_links_count);
535         u32 hi = le16_to_cpu(di->i_links_count_hi);
536 
537         if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
538                 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
539 
540         return nlink;
541 }
542 
543 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
544 {
545         u16 lo, hi;
546 
547         lo = nlink;
548         hi = nlink >> OCFS2_LINKS_HI_SHIFT;
549 
550         di->i_links_count = cpu_to_le16(lo);
551         di->i_links_count_hi = cpu_to_le16(hi);
552 }
553 
554 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
555 {
556         u32 links = ocfs2_read_links_count(di);
557 
558         links += n;
559 
560         ocfs2_set_links_count(di, links);
561 }
562 
563 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
564 {
565         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
566                 return 1;
567         return 0;
568 }
569 
570 /* set / clear functions because cluster events can make these happen
571  * in parallel so we want the transitions to be atomic. this also
572  * means that any future flags osb_flags must be protected by spinlock
573  * too! */
574 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
575                                       unsigned long flag)
576 {
577         spin_lock(&osb->osb_lock);
578         osb->osb_flags |= flag;
579         spin_unlock(&osb->osb_lock);
580 }
581 
582 
583 static inline unsigned long  ocfs2_test_osb_flag(struct ocfs2_super *osb,
584                                                  unsigned long flag)
585 {
586         unsigned long ret;
587 
588         spin_lock(&osb->osb_lock);
589         ret = osb->osb_flags & flag;
590         spin_unlock(&osb->osb_lock);
591         return ret;
592 }
593 
594 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
595                                      int hard)
596 {
597         spin_lock(&osb->osb_lock);
598         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
599         if (hard)
600                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
601         else
602                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
603         spin_unlock(&osb->osb_lock);
604 }
605 
606 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
607 {
608         int ret;
609 
610         spin_lock(&osb->osb_lock);
611         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
612         spin_unlock(&osb->osb_lock);
613 
614         return ret;
615 }
616 
617 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
618 {
619         int ret;
620 
621         spin_lock(&osb->osb_lock);
622         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
623         spin_unlock(&osb->osb_lock);
624 
625         return ret;
626 }
627 
628 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
629 {
630         return (osb->s_feature_incompat &
631                 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
632                  OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
633 }
634 
635 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
636 {
637         if (ocfs2_clusterinfo_valid(osb) &&
638             memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
639                    OCFS2_STACK_LABEL_LEN))
640                 return 1;
641         return 0;
642 }
643 
644 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
645 {
646         if (ocfs2_clusterinfo_valid(osb) &&
647             !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
648                    OCFS2_STACK_LABEL_LEN))
649                 return 1;
650         return 0;
651 }
652 
653 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
654 {
655         return ocfs2_o2cb_stack(osb) &&
656                 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
657 }
658 
659 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
660 {
661         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
662 }
663 
664 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
665 {
666         return (osb->s_feature_incompat &
667                 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
668 }
669 
670 
671 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
672         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
673 
674 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
675         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
676 
677 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
678         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
679 
680 
681 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)                                 \
682         (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
683 
684 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)                                 \
685         (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
686 
687 #define OCFS2_IS_VALID_DX_ROOT(ptr)                                     \
688         (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
689 
690 #define OCFS2_IS_VALID_DX_LEAF(ptr)                                     \
691         (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
692 
693 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)                              \
694         (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
695 
696 static inline unsigned long ino_from_blkno(struct super_block *sb,
697                                            u64 blkno)
698 {
699         return (unsigned long)(blkno & (u64)ULONG_MAX);
700 }
701 
702 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
703                                            u32 clusters)
704 {
705         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
706                 sb->s_blocksize_bits;
707 
708         return (u64)clusters << c_to_b_bits;
709 }
710 
711 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
712                                            u64 blocks)
713 {
714         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
715                 sb->s_blocksize_bits;
716 
717         return (u32)(blocks >> b_to_c_bits);
718 }
719 
720 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
721                                                     u64 bytes)
722 {
723         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
724         unsigned int clusters;
725 
726         bytes += OCFS2_SB(sb)->s_clustersize - 1;
727         /* OCFS2 just cannot have enough clusters to overflow this */
728         clusters = (unsigned int)(bytes >> cl_bits);
729 
730         return clusters;
731 }
732 
733 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
734                                          u64 bytes)
735 {
736         bytes += sb->s_blocksize - 1;
737         return bytes >> sb->s_blocksize_bits;
738 }
739 
740 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
741                                           u32 clusters)
742 {
743         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
744 }
745 
746 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
747                                                u64 blocks)
748 {
749         int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
750         unsigned int clusters;
751 
752         clusters = ocfs2_blocks_to_clusters(sb, blocks);
753         return (u64)clusters << bits;
754 }
755 
756 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
757                                                 u64 bytes)
758 {
759         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
760         unsigned int clusters;
761 
762         clusters = ocfs2_clusters_for_bytes(sb, bytes);
763         return (u64)clusters << cl_bits;
764 }
765 
766 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
767                                               u64 bytes)
768 {
769         u64 blocks;
770 
771         blocks = ocfs2_blocks_for_bytes(sb, bytes);
772         return blocks << sb->s_blocksize_bits;
773 }
774 
775 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
776 {
777         return (unsigned long)((bytes + 511) >> 9);
778 }
779 
780 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
781                                                         unsigned long pg_index)
782 {
783         u32 clusters = pg_index;
784         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
785 
786         if (unlikely(PAGE_CACHE_SHIFT > cbits))
787                 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
788         else if (PAGE_CACHE_SHIFT < cbits)
789                 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
790 
791         return clusters;
792 }
793 
794 /*
795  * Find the 1st page index which covers the given clusters.
796  */
797 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
798                                                         u32 clusters)
799 {
800         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
801         pgoff_t index = clusters;
802 
803         if (PAGE_CACHE_SHIFT > cbits) {
804                 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
805         } else if (PAGE_CACHE_SHIFT < cbits) {
806                 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
807         }
808 
809         return index;
810 }
811 
812 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
813 {
814         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
815         unsigned int pages_per_cluster = 1;
816 
817         if (PAGE_CACHE_SHIFT < cbits)
818                 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
819 
820         return pages_per_cluster;
821 }
822 
823 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
824                                                        unsigned int megs)
825 {
826         BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
827 
828         return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
829 }
830 
831 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
832                                                        unsigned int clusters)
833 {
834         return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
835 }
836 
837 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
838 {
839         __set_bit_le(bit, bitmap);
840 }
841 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
842 
843 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
844 {
845         __clear_bit_le(bit, bitmap);
846 }
847 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
848 
849 #define ocfs2_test_bit test_bit_le
850 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
851 #define ocfs2_find_next_bit find_next_bit_le
852 
853 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
854 {
855 #if BITS_PER_LONG == 64
856         *bit += ((unsigned long) addr & 7UL) << 3;
857         addr = (void *) ((unsigned long) addr & ~7UL);
858 #elif BITS_PER_LONG == 32
859         *bit += ((unsigned long) addr & 3UL) << 3;
860         addr = (void *) ((unsigned long) addr & ~3UL);
861 #else
862 #error "how many bits you are?!"
863 #endif
864         return addr;
865 }
866 
867 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
868 {
869         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
870         ocfs2_set_bit(bit, bitmap);
871 }
872 
873 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
874 {
875         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
876         ocfs2_clear_bit(bit, bitmap);
877 }
878 
879 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
880 {
881         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
882         return ocfs2_test_bit(bit, bitmap);
883 }
884 
885 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
886                                                         int start)
887 {
888         int fix = 0, ret, tmpmax;
889         bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
890         tmpmax = max + fix;
891         start += fix;
892 
893         ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
894         if (ret > max)
895                 return max;
896         return ret;
897 }
898 
899 #endif  /* OCFS2_H */
900 
901 

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