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[orion.git] / fs / ocfs2 / ocfs2.h
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1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * ocfs2.h
6 * Defines macros and structures used in OCFS2
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #ifndef OCFS2_H
27 #define OCFS2_H
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>
40 /* For union ocfs2_dlm_lksb */
41 #include "stackglue.h"
43 #include "ocfs2_fs.h"
44 #include "ocfs2_lockid.h"
45 #include "ocfs2_ioctl.h"
47 /* For struct ocfs2_blockcheck_stats */
48 #include "blockcheck.h"
50 #include "reservations.h"
52 /* Caching of metadata buffers */
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
61 /* Flags for ocfs2_caching_info */
63 enum ocfs2_caching_info_flags {
64 /* Indicates that the metadata cache is using the inline array */
65 OCFS2_CACHE_FL_INLINE = 1<<1,
68 struct ocfs2_caching_operations;
69 struct ocfs2_caching_info {
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.
75 const struct ocfs2_caching_operations *ci_ops;
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;
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;
92 * Need this prototype here instead of in uptodate.h because journal.h
93 * uses it.
95 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
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)];
105 enum ocfs2_ast_action {
106 OCFS2_AST_INVALID = 0,
107 OCFS2_AST_ATTACH,
108 OCFS2_AST_CONVERT,
109 OCFS2_AST_DOWNCONVERT,
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,
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 */
146 struct ocfs2_lock_res_ops;
148 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
150 struct ocfs2_lock_res {
151 void *l_priv;
152 struct ocfs2_lock_res_ops *l_ops;
153 spinlock_t l_lock;
155 struct list_head l_blocked_list;
156 struct list_head l_mask_waiters;
158 enum ocfs2_lock_type l_type;
159 unsigned long l_flags;
160 char l_name[OCFS2_LOCK_ID_MAX_LEN];
161 int l_level;
162 unsigned int l_ro_holders;
163 unsigned int l_ex_holders;
164 struct ocfs2_dlm_lksb l_lksb;
166 /* used from AST/BAST funcs. */
167 enum ocfs2_ast_action l_action;
168 enum ocfs2_unlock_action l_unlock_action;
169 int l_requested;
170 int l_blocking;
171 unsigned int l_pending_gen;
173 wait_queue_head_t l_event;
175 struct list_head l_debug_list;
177 #ifdef CONFIG_OCFS2_FS_STATS
178 unsigned long long l_lock_num_prmode; /* PR acquires */
179 unsigned long long l_lock_num_exmode; /* EX acquires */
180 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
181 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
182 unsigned long long l_lock_total_prmode; /* Tot wait for PR */
183 unsigned long long l_lock_total_exmode; /* Tot wait for EX */
184 unsigned int l_lock_max_prmode; /* Max wait for PR */
185 unsigned int l_lock_max_exmode; /* Max wait for EX */
186 unsigned int l_lock_refresh; /* Disk refreshes */
187 #endif
188 #ifdef CONFIG_DEBUG_LOCK_ALLOC
189 struct lockdep_map l_lockdep_map;
190 #endif
193 enum ocfs2_orphan_scan_state {
194 ORPHAN_SCAN_ACTIVE,
195 ORPHAN_SCAN_INACTIVE
198 struct ocfs2_orphan_scan {
199 struct mutex os_lock;
200 struct ocfs2_super *os_osb;
201 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */
202 struct delayed_work os_orphan_scan_work;
203 struct timespec os_scantime; /* time this node ran the scan */
204 u32 os_count; /* tracks node specific scans */
205 u32 os_seqno; /* tracks cluster wide scans */
206 atomic_t os_state; /* ACTIVE or INACTIVE */
209 struct ocfs2_dlm_debug {
210 struct kref d_refcnt;
211 struct dentry *d_locking_state;
212 struct list_head d_lockres_tracking;
215 enum ocfs2_vol_state
217 VOLUME_INIT = 0,
218 VOLUME_MOUNTED,
219 VOLUME_MOUNTED_QUOTAS,
220 VOLUME_DISMOUNTED,
221 VOLUME_DISABLED
224 struct ocfs2_alloc_stats
226 atomic_t moves;
227 atomic_t local_data;
228 atomic_t bitmap_data;
229 atomic_t bg_allocs;
230 atomic_t bg_extends;
233 enum ocfs2_local_alloc_state
235 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
236 * this mountpoint. */
237 OCFS2_LA_ENABLED, /* Local alloc is in use. */
238 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
239 * of bits has been reduced. */
240 OCFS2_LA_DISABLED /* Local alloc has temporarily been
241 * disabled. */
244 enum ocfs2_mount_options
246 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
247 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
248 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
249 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
250 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
251 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
252 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
253 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
254 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
255 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access
256 control lists */
257 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
258 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
261 #define OCFS2_OSB_SOFT_RO 0x0001
262 #define OCFS2_OSB_HARD_RO 0x0002
263 #define OCFS2_OSB_ERROR_FS 0x0004
264 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
266 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
268 struct ocfs2_journal;
269 struct ocfs2_slot_info;
270 struct ocfs2_recovery_map;
271 struct ocfs2_replay_map;
272 struct ocfs2_quota_recovery;
273 struct ocfs2_dentry_lock;
274 struct ocfs2_super
276 struct task_struct *commit_task;
277 struct super_block *sb;
278 struct inode *root_inode;
279 struct inode *sys_root_inode;
280 struct inode *system_inodes[NUM_SYSTEM_INODES];
282 struct ocfs2_slot_info *slot_info;
284 u32 *slot_recovery_generations;
286 spinlock_t node_map_lock;
288 u64 root_blkno;
289 u64 system_dir_blkno;
290 u64 bitmap_blkno;
291 u32 bitmap_cpg;
292 u8 *uuid;
293 char *uuid_str;
294 u32 uuid_hash;
295 u8 *vol_label;
296 u64 first_cluster_group_blkno;
297 u32 fs_generation;
299 u32 s_feature_compat;
300 u32 s_feature_incompat;
301 u32 s_feature_ro_compat;
303 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
304 * Could protect more on osb as it's very short lived.
306 spinlock_t osb_lock;
307 u32 s_next_generation;
308 unsigned long osb_flags;
309 s16 s_inode_steal_slot;
310 s16 s_meta_steal_slot;
311 atomic_t s_num_inodes_stolen;
312 atomic_t s_num_meta_stolen;
314 unsigned long s_mount_opt;
315 unsigned int s_atime_quantum;
317 unsigned int max_slots;
318 unsigned int node_num;
319 int slot_num;
320 int preferred_slot;
321 int s_sectsize_bits;
322 int s_clustersize;
323 int s_clustersize_bits;
324 unsigned int s_xattr_inline_size;
326 atomic_t vol_state;
327 struct mutex recovery_lock;
328 struct ocfs2_recovery_map *recovery_map;
329 struct ocfs2_replay_map *replay_map;
330 struct task_struct *recovery_thread_task;
331 int disable_recovery;
332 wait_queue_head_t checkpoint_event;
333 atomic_t needs_checkpoint;
334 struct ocfs2_journal *journal;
335 unsigned long osb_commit_interval;
337 struct delayed_work la_enable_wq;
340 * Must hold local alloc i_mutex and osb->osb_lock to change
341 * local_alloc_bits. Reads can be done under either lock.
343 unsigned int local_alloc_bits;
344 unsigned int local_alloc_default_bits;
345 /* osb_clusters_at_boot can become stale! Do not trust it to
346 * be up to date. */
347 unsigned int osb_clusters_at_boot;
349 enum ocfs2_local_alloc_state local_alloc_state; /* protected
350 * by osb_lock */
352 struct buffer_head *local_alloc_bh;
354 u64 la_last_gd;
356 struct ocfs2_reservation_map osb_la_resmap;
358 unsigned int osb_resv_level;
359 unsigned int osb_dir_resv_level;
361 /* Next three fields are for local node slot recovery during
362 * mount. */
363 int dirty;
364 struct ocfs2_dinode *local_alloc_copy;
365 struct ocfs2_quota_recovery *quota_rec;
367 struct ocfs2_blockcheck_stats osb_ecc_stats;
368 struct ocfs2_alloc_stats alloc_stats;
369 char dev_str[20]; /* "major,minor" of the device */
371 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
372 struct ocfs2_cluster_connection *cconn;
373 struct ocfs2_lock_res osb_super_lockres;
374 struct ocfs2_lock_res osb_rename_lockres;
375 struct ocfs2_lock_res osb_nfs_sync_lockres;
376 struct ocfs2_dlm_debug *osb_dlm_debug;
378 struct dentry *osb_debug_root;
379 struct dentry *osb_ctxt;
381 wait_queue_head_t recovery_event;
383 spinlock_t dc_task_lock;
384 struct task_struct *dc_task;
385 wait_queue_head_t dc_event;
386 unsigned long dc_wake_sequence;
387 unsigned long dc_work_sequence;
390 * Any thread can add locks to the list, but the downconvert
391 * thread is the only one allowed to remove locks. Any change
392 * to this rule requires updating
393 * ocfs2_downconvert_thread_do_work().
395 struct list_head blocked_lock_list;
396 unsigned long blocked_lock_count;
398 /* List of dentry locks to release. Anyone can add locks to
399 * the list, ocfs2_wq processes the list */
400 struct ocfs2_dentry_lock *dentry_lock_list;
401 struct work_struct dentry_lock_work;
403 wait_queue_head_t osb_mount_event;
405 /* Truncate log info */
406 struct inode *osb_tl_inode;
407 struct buffer_head *osb_tl_bh;
408 struct delayed_work osb_truncate_log_wq;
410 struct ocfs2_node_map osb_recovering_orphan_dirs;
411 unsigned int *osb_orphan_wipes;
412 wait_queue_head_t osb_wipe_event;
414 struct ocfs2_orphan_scan osb_orphan_scan;
416 /* used to protect metaecc calculation check of xattr. */
417 spinlock_t osb_xattr_lock;
419 unsigned int osb_dx_mask;
420 u32 osb_dx_seed[4];
422 /* the group we used to allocate inodes. */
423 u64 osb_inode_alloc_group;
425 /* rb tree root for refcount lock. */
426 struct rb_root osb_rf_lock_tree;
427 struct ocfs2_refcount_tree *osb_ref_tree_lru;
430 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
432 /* Useful typedef for passing around journal access functions */
433 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
434 struct ocfs2_caching_info *ci,
435 struct buffer_head *bh, int type);
437 static inline int ocfs2_should_order_data(struct inode *inode)
439 if (!S_ISREG(inode->i_mode))
440 return 0;
441 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
442 return 0;
443 return 1;
446 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
448 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
449 return 1;
450 return 0;
453 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
456 * Support for sparse files is a pre-requisite
458 if (!ocfs2_sparse_alloc(osb))
459 return 0;
461 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
462 return 1;
463 return 0;
466 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
468 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
469 return 1;
470 return 0;
473 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
475 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
476 return 1;
477 return 0;
480 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
482 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
483 return 1;
484 return 0;
487 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
489 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
490 return 1;
491 return 0;
494 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
496 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
497 return 1;
498 return 0;
501 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
503 if (ocfs2_supports_indexed_dirs(osb))
504 return OCFS2_DX_LINK_MAX;
505 return OCFS2_LINK_MAX;
508 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
510 u32 nlink = le16_to_cpu(di->i_links_count);
511 u32 hi = le16_to_cpu(di->i_links_count_hi);
513 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
514 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
516 return nlink;
519 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
521 u16 lo, hi;
523 lo = nlink;
524 hi = nlink >> OCFS2_LINKS_HI_SHIFT;
526 di->i_links_count = cpu_to_le16(lo);
527 di->i_links_count_hi = cpu_to_le16(hi);
530 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
532 u32 links = ocfs2_read_links_count(di);
534 links += n;
536 ocfs2_set_links_count(di, links);
539 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
541 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
542 return 1;
543 return 0;
546 /* set / clear functions because cluster events can make these happen
547 * in parallel so we want the transitions to be atomic. this also
548 * means that any future flags osb_flags must be protected by spinlock
549 * too! */
550 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
551 unsigned long flag)
553 spin_lock(&osb->osb_lock);
554 osb->osb_flags |= flag;
555 spin_unlock(&osb->osb_lock);
559 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
560 unsigned long flag)
562 unsigned long ret;
564 spin_lock(&osb->osb_lock);
565 ret = osb->osb_flags & flag;
566 spin_unlock(&osb->osb_lock);
567 return ret;
570 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
571 int hard)
573 spin_lock(&osb->osb_lock);
574 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
575 if (hard)
576 osb->osb_flags |= OCFS2_OSB_HARD_RO;
577 else
578 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
579 spin_unlock(&osb->osb_lock);
582 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
584 int ret;
586 spin_lock(&osb->osb_lock);
587 ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
588 spin_unlock(&osb->osb_lock);
590 return ret;
593 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
595 int ret;
597 spin_lock(&osb->osb_lock);
598 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
599 spin_unlock(&osb->osb_lock);
601 return ret;
604 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
606 return (osb->s_feature_incompat &
607 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
610 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
612 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
615 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
617 return (osb->s_feature_incompat &
618 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
622 #define OCFS2_IS_VALID_DINODE(ptr) \
623 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
625 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
626 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
628 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
629 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
632 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
633 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
635 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
636 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
638 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
639 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
641 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
642 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
644 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
645 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
647 static inline unsigned long ino_from_blkno(struct super_block *sb,
648 u64 blkno)
650 return (unsigned long)(blkno & (u64)ULONG_MAX);
653 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
654 u32 clusters)
656 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
657 sb->s_blocksize_bits;
659 return (u64)clusters << c_to_b_bits;
662 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
663 u64 blocks)
665 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
666 sb->s_blocksize_bits;
668 return (u32)(blocks >> b_to_c_bits);
671 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
672 u64 bytes)
674 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
675 unsigned int clusters;
677 bytes += OCFS2_SB(sb)->s_clustersize - 1;
678 /* OCFS2 just cannot have enough clusters to overflow this */
679 clusters = (unsigned int)(bytes >> cl_bits);
681 return clusters;
684 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
685 u64 bytes)
687 bytes += sb->s_blocksize - 1;
688 return bytes >> sb->s_blocksize_bits;
691 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
692 u32 clusters)
694 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
697 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
698 u64 blocks)
700 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
701 unsigned int clusters;
703 clusters = ocfs2_blocks_to_clusters(sb, blocks);
704 return (u64)clusters << bits;
707 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
708 u64 bytes)
710 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
711 unsigned int clusters;
713 clusters = ocfs2_clusters_for_bytes(sb, bytes);
714 return (u64)clusters << cl_bits;
717 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
718 u64 bytes)
720 u64 blocks;
722 blocks = ocfs2_blocks_for_bytes(sb, bytes);
723 return blocks << sb->s_blocksize_bits;
726 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
728 return (unsigned long)((bytes + 511) >> 9);
731 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
732 unsigned long pg_index)
734 u32 clusters = pg_index;
735 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
737 if (unlikely(PAGE_CACHE_SHIFT > cbits))
738 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
739 else if (PAGE_CACHE_SHIFT < cbits)
740 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
742 return clusters;
746 * Find the 1st page index which covers the given clusters.
748 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
749 u32 clusters)
751 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
752 pgoff_t index = clusters;
754 if (PAGE_CACHE_SHIFT > cbits) {
755 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
756 } else if (PAGE_CACHE_SHIFT < cbits) {
757 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
760 return index;
763 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
765 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
766 unsigned int pages_per_cluster = 1;
768 if (PAGE_CACHE_SHIFT < cbits)
769 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
771 return pages_per_cluster;
774 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
775 unsigned int megs)
777 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
779 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
782 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
783 unsigned int clusters)
785 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
788 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
790 ext2_set_bit(bit, bitmap);
792 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
794 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
796 ext2_clear_bit(bit, bitmap);
798 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
800 #define ocfs2_test_bit ext2_test_bit
801 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
802 #define ocfs2_find_next_bit ext2_find_next_bit
803 #endif /* OCFS2_H */