1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
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.
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"
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;
87 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
88 struct rb_root ci_tree;
92 * Need this prototype here instead of in uptodate.h because journal.h
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 {
102 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
105 enum ocfs2_ast_action {
106 OCFS2_AST_INVALID = 0,
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
122 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
124 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
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
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
146 struct ocfs2_lock_res_ops;
148 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
150 struct ocfs2_lock_res {
152 struct ocfs2_lock_res_ops *l_ops;
155 struct list_head l_blocked_list;
156 struct list_head l_mask_waiters;
158 unsigned long l_flags;
159 char l_name[OCFS2_LOCK_ID_MAX_LEN];
160 unsigned int l_ro_holders;
161 unsigned int l_ex_holders;
162 unsigned char l_level;
164 /* Data packed - type enum ocfs2_lock_type */
165 unsigned char l_type;
167 /* used from AST/BAST funcs. */
168 /* Data packed - enum type ocfs2_ast_action */
169 unsigned char l_action;
170 /* Data packed - enum type ocfs2_unlock_action */
171 unsigned char l_unlock_action;
172 unsigned char l_requested;
173 unsigned char l_blocking;
174 unsigned int l_pending_gen;
178 struct ocfs2_dlm_lksb l_lksb;
180 wait_queue_head_t l_event;
182 struct list_head l_debug_list;
184 #ifdef CONFIG_OCFS2_FS_STATS
185 unsigned long long l_lock_num_prmode; /* PR acquires */
186 unsigned long long l_lock_num_exmode; /* EX acquires */
187 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
188 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
189 unsigned long long l_lock_total_prmode; /* Tot wait for PR */
190 unsigned long long l_lock_total_exmode; /* Tot wait for EX */
191 unsigned int l_lock_max_prmode; /* Max wait for PR */
192 unsigned int l_lock_max_exmode; /* Max wait for EX */
193 unsigned int l_lock_refresh; /* Disk refreshes */
195 #ifdef CONFIG_DEBUG_LOCK_ALLOC
196 struct lockdep_map l_lockdep_map;
200 enum ocfs2_orphan_scan_state {
205 struct ocfs2_orphan_scan {
206 struct mutex os_lock;
207 struct ocfs2_super *os_osb;
208 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */
209 struct delayed_work os_orphan_scan_work;
210 struct timespec os_scantime; /* time this node ran the scan */
211 u32 os_count; /* tracks node specific scans */
212 u32 os_seqno; /* tracks cluster wide scans */
213 atomic_t os_state; /* ACTIVE or INACTIVE */
216 struct ocfs2_dlm_debug {
217 struct kref d_refcnt;
218 struct dentry *d_locking_state;
219 struct list_head d_lockres_tracking;
226 VOLUME_MOUNTED_QUOTAS,
231 struct ocfs2_alloc_stats
235 atomic_t bitmap_data;
240 enum ocfs2_local_alloc_state
242 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
243 * this mountpoint. */
244 OCFS2_LA_ENABLED, /* Local alloc is in use. */
245 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
246 * of bits has been reduced. */
247 OCFS2_LA_DISABLED /* Local alloc has temporarily been
251 enum ocfs2_mount_options
253 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
254 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
255 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
256 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
257 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
258 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
259 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
260 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
261 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
262 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access
264 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
265 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
268 #define OCFS2_OSB_SOFT_RO 0x0001
269 #define OCFS2_OSB_HARD_RO 0x0002
270 #define OCFS2_OSB_ERROR_FS 0x0004
271 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
273 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
275 struct ocfs2_journal;
276 struct ocfs2_slot_info;
277 struct ocfs2_recovery_map;
278 struct ocfs2_replay_map;
279 struct ocfs2_quota_recovery;
280 struct ocfs2_dentry_lock;
283 struct task_struct *commit_task;
284 struct super_block *sb;
285 struct inode *root_inode;
286 struct inode *sys_root_inode;
287 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
288 struct inode **local_system_inodes;
290 struct ocfs2_slot_info *slot_info;
292 u32 *slot_recovery_generations;
294 spinlock_t node_map_lock;
297 u64 system_dir_blkno;
304 u64 first_cluster_group_blkno;
307 u32 s_feature_compat;
308 u32 s_feature_incompat;
309 u32 s_feature_ro_compat;
311 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
312 * Could protect more on osb as it's very short lived.
315 u32 s_next_generation;
316 unsigned long osb_flags;
317 s16 s_inode_steal_slot;
318 s16 s_meta_steal_slot;
319 atomic_t s_num_inodes_stolen;
320 atomic_t s_num_meta_stolen;
322 unsigned long s_mount_opt;
323 unsigned int s_atime_quantum;
325 unsigned int max_slots;
326 unsigned int node_num;
331 int s_clustersize_bits;
332 unsigned int s_xattr_inline_size;
335 struct mutex recovery_lock;
336 struct ocfs2_recovery_map *recovery_map;
337 struct ocfs2_replay_map *replay_map;
338 struct task_struct *recovery_thread_task;
339 int disable_recovery;
340 wait_queue_head_t checkpoint_event;
341 atomic_t needs_checkpoint;
342 struct ocfs2_journal *journal;
343 unsigned long osb_commit_interval;
345 struct delayed_work la_enable_wq;
348 * Must hold local alloc i_mutex and osb->osb_lock to change
349 * local_alloc_bits. Reads can be done under either lock.
351 unsigned int local_alloc_bits;
352 unsigned int local_alloc_default_bits;
353 /* osb_clusters_at_boot can become stale! Do not trust it to
355 unsigned int osb_clusters_at_boot;
357 enum ocfs2_local_alloc_state local_alloc_state; /* protected
360 struct buffer_head *local_alloc_bh;
364 struct ocfs2_reservation_map osb_la_resmap;
366 unsigned int osb_resv_level;
367 unsigned int osb_dir_resv_level;
369 /* Next three fields are for local node slot recovery during
372 struct ocfs2_dinode *local_alloc_copy;
373 struct ocfs2_quota_recovery *quota_rec;
375 struct ocfs2_blockcheck_stats osb_ecc_stats;
376 struct ocfs2_alloc_stats alloc_stats;
377 char dev_str[20]; /* "major,minor" of the device */
379 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
380 struct ocfs2_cluster_connection *cconn;
381 struct ocfs2_lock_res osb_super_lockres;
382 struct ocfs2_lock_res osb_rename_lockres;
383 struct ocfs2_lock_res osb_nfs_sync_lockres;
384 struct ocfs2_dlm_debug *osb_dlm_debug;
386 struct dentry *osb_debug_root;
387 struct dentry *osb_ctxt;
389 wait_queue_head_t recovery_event;
391 spinlock_t dc_task_lock;
392 struct task_struct *dc_task;
393 wait_queue_head_t dc_event;
394 unsigned long dc_wake_sequence;
395 unsigned long dc_work_sequence;
398 * Any thread can add locks to the list, but the downconvert
399 * thread is the only one allowed to remove locks. Any change
400 * to this rule requires updating
401 * ocfs2_downconvert_thread_do_work().
403 struct list_head blocked_lock_list;
404 unsigned long blocked_lock_count;
406 /* List of dentry locks to release. Anyone can add locks to
407 * the list, ocfs2_wq processes the list */
408 struct ocfs2_dentry_lock *dentry_lock_list;
409 struct work_struct dentry_lock_work;
411 wait_queue_head_t osb_mount_event;
413 /* Truncate log info */
414 struct inode *osb_tl_inode;
415 struct buffer_head *osb_tl_bh;
416 struct delayed_work osb_truncate_log_wq;
418 struct ocfs2_node_map osb_recovering_orphan_dirs;
419 unsigned int *osb_orphan_wipes;
420 wait_queue_head_t osb_wipe_event;
422 struct ocfs2_orphan_scan osb_orphan_scan;
424 /* used to protect metaecc calculation check of xattr. */
425 spinlock_t osb_xattr_lock;
427 unsigned int osb_dx_mask;
430 /* the group we used to allocate inodes. */
431 u64 osb_inode_alloc_group;
433 /* rb tree root for refcount lock. */
434 struct rb_root osb_rf_lock_tree;
435 struct ocfs2_refcount_tree *osb_ref_tree_lru;
438 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
440 /* Useful typedef for passing around journal access functions */
441 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
442 struct ocfs2_caching_info *ci,
443 struct buffer_head *bh, int type);
445 static inline int ocfs2_should_order_data(struct inode *inode)
447 if (!S_ISREG(inode->i_mode))
449 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
454 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
456 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
461 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
464 * Support for sparse files is a pre-requisite
466 if (!ocfs2_sparse_alloc(osb))
469 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
474 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
476 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
481 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
483 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
488 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
490 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
495 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
497 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
502 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
504 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
509 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
511 if (ocfs2_supports_indexed_dirs(osb))
512 return OCFS2_DX_LINK_MAX;
513 return OCFS2_LINK_MAX;
516 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
518 u32 nlink = le16_to_cpu(di->i_links_count);
519 u32 hi = le16_to_cpu(di->i_links_count_hi);
521 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
522 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
527 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
532 hi = nlink >> OCFS2_LINKS_HI_SHIFT;
534 di->i_links_count = cpu_to_le16(lo);
535 di->i_links_count_hi = cpu_to_le16(hi);
538 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
540 u32 links = ocfs2_read_links_count(di);
544 ocfs2_set_links_count(di, links);
547 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
549 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
554 /* set / clear functions because cluster events can make these happen
555 * in parallel so we want the transitions to be atomic. this also
556 * means that any future flags osb_flags must be protected by spinlock
558 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
561 spin_lock(&osb->osb_lock);
562 osb->osb_flags |= flag;
563 spin_unlock(&osb->osb_lock);
567 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
572 spin_lock(&osb->osb_lock);
573 ret = osb->osb_flags & flag;
574 spin_unlock(&osb->osb_lock);
578 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
581 spin_lock(&osb->osb_lock);
582 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
584 osb->osb_flags |= OCFS2_OSB_HARD_RO;
586 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
587 spin_unlock(&osb->osb_lock);
590 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
594 spin_lock(&osb->osb_lock);
595 ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
596 spin_unlock(&osb->osb_lock);
601 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
605 spin_lock(&osb->osb_lock);
606 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
607 spin_unlock(&osb->osb_lock);
612 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
614 return (osb->s_feature_incompat &
615 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
618 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
620 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
623 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
625 return (osb->s_feature_incompat &
626 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
630 #define OCFS2_IS_VALID_DINODE(ptr) \
631 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
633 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
634 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
636 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
637 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
640 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
641 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
643 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
644 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
646 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
647 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
649 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
650 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
652 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
653 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
655 static inline unsigned long ino_from_blkno(struct super_block *sb,
658 return (unsigned long)(blkno & (u64)ULONG_MAX);
661 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
664 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
665 sb->s_blocksize_bits;
667 return (u64)clusters << c_to_b_bits;
670 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
673 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
674 sb->s_blocksize_bits;
676 return (u32)(blocks >> b_to_c_bits);
679 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
682 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
683 unsigned int clusters;
685 bytes += OCFS2_SB(sb)->s_clustersize - 1;
686 /* OCFS2 just cannot have enough clusters to overflow this */
687 clusters = (unsigned int)(bytes >> cl_bits);
692 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
695 bytes += sb->s_blocksize - 1;
696 return bytes >> sb->s_blocksize_bits;
699 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
702 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
705 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
708 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
709 unsigned int clusters;
711 clusters = ocfs2_blocks_to_clusters(sb, blocks);
712 return (u64)clusters << bits;
715 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
718 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
719 unsigned int clusters;
721 clusters = ocfs2_clusters_for_bytes(sb, bytes);
722 return (u64)clusters << cl_bits;
725 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
730 blocks = ocfs2_blocks_for_bytes(sb, bytes);
731 return blocks << sb->s_blocksize_bits;
734 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
736 return (unsigned long)((bytes + 511) >> 9);
739 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
740 unsigned long pg_index)
742 u32 clusters = pg_index;
743 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
745 if (unlikely(PAGE_CACHE_SHIFT > cbits))
746 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
747 else if (PAGE_CACHE_SHIFT < cbits)
748 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
754 * Find the 1st page index which covers the given clusters.
756 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
759 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
760 pgoff_t index = clusters;
762 if (PAGE_CACHE_SHIFT > cbits) {
763 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
764 } else if (PAGE_CACHE_SHIFT < cbits) {
765 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
771 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
773 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
774 unsigned int pages_per_cluster = 1;
776 if (PAGE_CACHE_SHIFT < cbits)
777 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
779 return pages_per_cluster;
782 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
785 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
787 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
790 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
791 unsigned int clusters)
793 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
796 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
798 ext2_set_bit(bit, bitmap);
800 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
802 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
804 ext2_clear_bit(bit, bitmap);
806 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
808 #define ocfs2_test_bit ext2_test_bit
809 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
810 #define ocfs2_find_next_bit ext2_find_next_bit