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/llist.h>
34 #include <linux/rbtree.h>
35 #include <linux/workqueue.h>
36 #include <linux/kref.h>
37 #include <linux/mutex.h>
38 #include <linux/lockdep.h>
39 #include <linux/jbd2.h>
41 /* For union ocfs2_dlm_lksb */
42 #include "stackglue.h"
45 #include "ocfs2_lockid.h"
46 #include "ocfs2_ioctl.h"
48 /* For struct ocfs2_blockcheck_stats */
49 #include "blockcheck.h"
51 #include "reservations.h"
53 /* Caching of metadata buffers */
55 /* Most user visible OCFS2 inodes will have very few pieces of
56 * metadata, but larger files (including bitmaps, etc) must be taken
57 * into account when designing an access scheme. We allow a small
58 * amount of inlined blocks to be stored on an array and grow the
59 * structure into a rb tree when necessary. */
60 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
62 /* Flags for ocfs2_caching_info */
64 enum ocfs2_caching_info_flags {
65 /* Indicates that the metadata cache is using the inline array */
66 OCFS2_CACHE_FL_INLINE = 1<<1,
69 struct ocfs2_caching_operations;
70 struct ocfs2_caching_info {
72 * The parent structure provides the locks, but because the
73 * parent structure can differ, it provides locking operations
74 * to struct ocfs2_caching_info.
76 const struct ocfs2_caching_operations *ci_ops;
78 /* next two are protected by trans_inc_lock */
79 /* which transaction were we created on? Zero if none. */
80 unsigned long ci_created_trans;
81 /* last transaction we were a part of. */
82 unsigned long ci_last_trans;
84 /* Cache structures */
85 unsigned int ci_flags;
86 unsigned int ci_num_cached;
88 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
89 struct rb_root ci_tree;
93 * Need this prototype here instead of in uptodate.h because journal.h
96 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
98 /* this limits us to 256 nodes
99 * if we need more, we can do a kmalloc for the map */
100 #define OCFS2_NODE_MAP_MAX_NODES 256
101 struct ocfs2_node_map {
103 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
106 enum ocfs2_ast_action {
107 OCFS2_AST_INVALID = 0,
110 OCFS2_AST_DOWNCONVERT,
113 /* actions for an unlockast function to take. */
114 enum ocfs2_unlock_action {
115 OCFS2_UNLOCK_INVALID = 0,
116 OCFS2_UNLOCK_CANCEL_CONVERT,
117 OCFS2_UNLOCK_DROP_LOCK,
120 /* ocfs2_lock_res->l_flags flags. */
121 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
123 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
125 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
127 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
128 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
129 #define OCFS2_LOCK_REFRESHING (0x00000020)
130 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
131 * for shutdown paths */
132 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
133 * when to skip queueing
134 * a lock because it's
137 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
138 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
139 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
140 call to dlm_lock. Only
141 exists with BUSY set. */
142 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
143 * from downconverting
144 * before the upconvert
147 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
149 * returned, do not block
153 struct ocfs2_lock_res_ops;
155 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
157 #ifdef CONFIG_OCFS2_FS_STATS
158 struct ocfs2_lock_stats {
159 u64 ls_total; /* Total wait in NSEC */
160 u32 ls_gets; /* Num acquires */
161 u32 ls_fail; /* Num failed acquires */
163 /* Storing max wait in usecs saves 24 bytes per inode */
164 u32 ls_max; /* Max wait in USEC */
168 struct ocfs2_lock_res {
170 struct ocfs2_lock_res_ops *l_ops;
173 struct list_head l_blocked_list;
174 struct list_head l_mask_waiters;
176 unsigned long l_flags;
177 char l_name[OCFS2_LOCK_ID_MAX_LEN];
178 unsigned int l_ro_holders;
179 unsigned int l_ex_holders;
181 signed char l_requested;
182 signed char l_blocking;
184 /* Data packed - type enum ocfs2_lock_type */
185 unsigned char l_type;
187 /* used from AST/BAST funcs. */
188 /* Data packed - enum type ocfs2_ast_action */
189 unsigned char l_action;
190 /* Data packed - enum type ocfs2_unlock_action */
191 unsigned char l_unlock_action;
192 unsigned int l_pending_gen;
196 struct ocfs2_dlm_lksb l_lksb;
198 wait_queue_head_t l_event;
200 struct list_head l_debug_list;
202 #ifdef CONFIG_OCFS2_FS_STATS
203 struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */
204 u32 l_lock_refresh; /* Disk refreshes */
205 struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */
207 #ifdef CONFIG_DEBUG_LOCK_ALLOC
208 struct lockdep_map l_lockdep_map;
212 enum ocfs2_orphan_scan_state {
217 struct ocfs2_orphan_scan {
218 struct mutex os_lock;
219 struct ocfs2_super *os_osb;
220 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */
221 struct delayed_work os_orphan_scan_work;
222 struct timespec os_scantime; /* time this node ran the scan */
223 u32 os_count; /* tracks node specific scans */
224 u32 os_seqno; /* tracks cluster wide scans */
225 atomic_t os_state; /* ACTIVE or INACTIVE */
228 struct ocfs2_dlm_debug {
229 struct kref d_refcnt;
230 struct dentry *d_locking_state;
231 struct list_head d_lockres_tracking;
238 VOLUME_MOUNTED_QUOTAS,
243 struct ocfs2_alloc_stats
247 atomic_t bitmap_data;
252 enum ocfs2_local_alloc_state
254 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
255 * this mountpoint. */
256 OCFS2_LA_ENABLED, /* Local alloc is in use. */
257 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
258 * of bits has been reduced. */
259 OCFS2_LA_DISABLED /* Local alloc has temporarily been
263 enum ocfs2_mount_options
265 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
266 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
267 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
268 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
269 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
270 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
271 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
272 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
273 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
274 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access
276 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
277 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
278 OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
280 OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
281 OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
284 #define OCFS2_OSB_SOFT_RO 0x0001
285 #define OCFS2_OSB_HARD_RO 0x0002
286 #define OCFS2_OSB_ERROR_FS 0x0004
287 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
289 struct ocfs2_journal;
290 struct ocfs2_slot_info;
291 struct ocfs2_recovery_map;
292 struct ocfs2_replay_map;
293 struct ocfs2_quota_recovery;
296 struct task_struct *commit_task;
297 struct super_block *sb;
298 struct inode *root_inode;
299 struct inode *sys_root_inode;
300 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
301 struct inode **local_system_inodes;
303 struct ocfs2_slot_info *slot_info;
305 u32 *slot_recovery_generations;
307 spinlock_t node_map_lock;
310 u64 system_dir_blkno;
317 u64 first_cluster_group_blkno;
320 u32 s_feature_compat;
321 u32 s_feature_incompat;
322 u32 s_feature_ro_compat;
324 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
325 * Could protect more on osb as it's very short lived.
328 u32 s_next_generation;
329 unsigned long osb_flags;
330 s16 s_inode_steal_slot;
331 s16 s_meta_steal_slot;
332 atomic_t s_num_inodes_stolen;
333 atomic_t s_num_meta_stolen;
335 unsigned long s_mount_opt;
336 unsigned int s_atime_quantum;
338 unsigned int max_slots;
339 unsigned int node_num;
344 int s_clustersize_bits;
345 unsigned int s_xattr_inline_size;
348 struct mutex recovery_lock;
349 struct ocfs2_recovery_map *recovery_map;
350 struct ocfs2_replay_map *replay_map;
351 struct task_struct *recovery_thread_task;
352 int disable_recovery;
353 wait_queue_head_t checkpoint_event;
354 struct ocfs2_journal *journal;
355 unsigned long osb_commit_interval;
357 struct delayed_work la_enable_wq;
360 * Must hold local alloc i_mutex and osb->osb_lock to change
361 * local_alloc_bits. Reads can be done under either lock.
363 unsigned int local_alloc_bits;
364 unsigned int local_alloc_default_bits;
365 /* osb_clusters_at_boot can become stale! Do not trust it to
367 unsigned int osb_clusters_at_boot;
369 enum ocfs2_local_alloc_state local_alloc_state; /* protected
372 struct buffer_head *local_alloc_bh;
376 struct ocfs2_reservation_map osb_la_resmap;
378 unsigned int osb_resv_level;
379 unsigned int osb_dir_resv_level;
381 /* Next three fields are for local node slot recovery during
384 struct ocfs2_dinode *local_alloc_copy;
385 struct ocfs2_quota_recovery *quota_rec;
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 */
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_dlm_debug *osb_dlm_debug;
401 struct dentry *osb_debug_root;
402 struct dentry *osb_ctxt;
404 wait_queue_head_t recovery_event;
406 spinlock_t dc_task_lock;
407 struct task_struct *dc_task;
408 wait_queue_head_t dc_event;
409 unsigned long dc_wake_sequence;
410 unsigned long dc_work_sequence;
413 * Any thread can add locks to the list, but the downconvert
414 * thread is the only one allowed to remove locks. Any change
415 * to this rule requires updating
416 * ocfs2_downconvert_thread_do_work().
418 struct list_head blocked_lock_list;
419 unsigned long blocked_lock_count;
421 /* List of dquot structures to drop last reference to */
422 struct llist_head dquot_drop_list;
423 struct work_struct dquot_drop_work;
425 wait_queue_head_t osb_mount_event;
427 /* Truncate log info */
428 struct inode *osb_tl_inode;
429 struct buffer_head *osb_tl_bh;
430 struct delayed_work osb_truncate_log_wq;
431 atomic_t osb_tl_disable;
433 * How many clusters in our truncate log.
434 * It must be protected by osb_tl_inode->i_mutex.
436 unsigned int truncated_clusters;
438 struct ocfs2_node_map osb_recovering_orphan_dirs;
439 unsigned int *osb_orphan_wipes;
440 wait_queue_head_t osb_wipe_event;
442 struct ocfs2_orphan_scan osb_orphan_scan;
444 /* used to protect metaecc calculation check of xattr. */
445 spinlock_t osb_xattr_lock;
447 unsigned int osb_dx_mask;
450 /* the group we used to allocate inodes. */
451 u64 osb_inode_alloc_group;
453 /* rb tree root for refcount lock. */
454 struct rb_root osb_rf_lock_tree;
455 struct ocfs2_refcount_tree *osb_ref_tree_lru;
457 struct mutex system_file_mutex;
460 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
462 /* Useful typedef for passing around journal access functions */
463 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
464 struct ocfs2_caching_info *ci,
465 struct buffer_head *bh, int type);
467 static inline int ocfs2_should_order_data(struct inode *inode)
469 if (!S_ISREG(inode->i_mode))
471 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
476 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
478 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
483 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
486 * Support for sparse files is a pre-requisite
488 if (!ocfs2_sparse_alloc(osb))
491 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
496 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
498 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
503 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
505 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
510 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
512 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
517 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
519 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
524 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
526 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
531 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
533 if (ocfs2_supports_indexed_dirs(osb))
534 return OCFS2_DX_LINK_MAX;
535 return OCFS2_LINK_MAX;
538 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
540 u32 nlink = le16_to_cpu(di->i_links_count);
541 u32 hi = le16_to_cpu(di->i_links_count_hi);
543 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
544 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
549 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
554 hi = nlink >> OCFS2_LINKS_HI_SHIFT;
556 di->i_links_count = cpu_to_le16(lo);
557 di->i_links_count_hi = cpu_to_le16(hi);
560 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
562 u32 links = ocfs2_read_links_count(di);
566 ocfs2_set_links_count(di, links);
569 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
571 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
576 /* set / clear functions because cluster events can make these happen
577 * in parallel so we want the transitions to be atomic. this also
578 * means that any future flags osb_flags must be protected by spinlock
580 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
583 spin_lock(&osb->osb_lock);
584 osb->osb_flags |= flag;
585 spin_unlock(&osb->osb_lock);
588 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
591 spin_lock(&osb->osb_lock);
592 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
594 osb->osb_flags |= OCFS2_OSB_HARD_RO;
596 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
597 spin_unlock(&osb->osb_lock);
600 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
604 spin_lock(&osb->osb_lock);
605 ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
606 spin_unlock(&osb->osb_lock);
611 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
615 spin_lock(&osb->osb_lock);
616 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
617 spin_unlock(&osb->osb_lock);
622 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
624 return (osb->s_feature_incompat &
625 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
626 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
629 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
631 if (ocfs2_clusterinfo_valid(osb) &&
632 memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
633 OCFS2_STACK_LABEL_LEN))
638 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
640 if (ocfs2_clusterinfo_valid(osb) &&
641 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
642 OCFS2_STACK_LABEL_LEN))
647 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
649 return ocfs2_o2cb_stack(osb) &&
650 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
653 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
655 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
658 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
660 return (osb->s_feature_incompat &
661 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
665 #define OCFS2_IS_VALID_DINODE(ptr) \
666 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
668 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
669 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
671 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
672 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
675 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
676 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
678 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
679 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
681 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
682 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
684 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
685 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
687 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
688 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
690 static inline unsigned long ino_from_blkno(struct super_block *sb,
693 return (unsigned long)(blkno & (u64)ULONG_MAX);
696 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
699 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
700 sb->s_blocksize_bits;
702 return (u64)clusters << c_to_b_bits;
705 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
708 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
709 sb->s_blocksize_bits;
711 return (u32)(blocks >> b_to_c_bits);
714 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
717 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
718 unsigned int clusters;
720 bytes += OCFS2_SB(sb)->s_clustersize - 1;
721 /* OCFS2 just cannot have enough clusters to overflow this */
722 clusters = (unsigned int)(bytes >> cl_bits);
727 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
730 bytes += sb->s_blocksize - 1;
731 return bytes >> sb->s_blocksize_bits;
734 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
737 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
740 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
743 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
744 unsigned int clusters;
746 clusters = ocfs2_blocks_to_clusters(sb, blocks);
747 return (u64)clusters << bits;
750 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
753 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
754 unsigned int clusters;
756 clusters = ocfs2_clusters_for_bytes(sb, bytes);
757 return (u64)clusters << cl_bits;
760 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
765 blocks = ocfs2_blocks_for_bytes(sb, bytes);
766 return blocks << sb->s_blocksize_bits;
769 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
771 return (unsigned long)((bytes + 511) >> 9);
774 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
775 unsigned long pg_index)
777 u32 clusters = pg_index;
778 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
780 if (unlikely(PAGE_CACHE_SHIFT > cbits))
781 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
782 else if (PAGE_CACHE_SHIFT < cbits)
783 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
789 * Find the 1st page index which covers the given clusters.
791 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
794 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
795 pgoff_t index = clusters;
797 if (PAGE_CACHE_SHIFT > cbits) {
798 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
799 } else if (PAGE_CACHE_SHIFT < cbits) {
800 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
806 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
808 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
809 unsigned int pages_per_cluster = 1;
811 if (PAGE_CACHE_SHIFT < cbits)
812 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
814 return pages_per_cluster;
817 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
820 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
822 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
825 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
826 unsigned int clusters)
828 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
831 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
833 __set_bit_le(bit, bitmap);
835 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
837 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
839 __clear_bit_le(bit, bitmap);
841 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
843 #define ocfs2_test_bit test_bit_le
844 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
845 #define ocfs2_find_next_bit find_next_bit_le
847 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
849 #if BITS_PER_LONG == 64
850 *bit += ((unsigned long) addr & 7UL) << 3;
851 addr = (void *) ((unsigned long) addr & ~7UL);
852 #elif BITS_PER_LONG == 32
853 *bit += ((unsigned long) addr & 3UL) << 3;
854 addr = (void *) ((unsigned long) addr & ~3UL);
856 #error "how many bits you are?!"
861 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
863 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
864 ocfs2_set_bit(bit, bitmap);
867 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
869 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
870 ocfs2_clear_bit(bit, bitmap);
873 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
875 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
876 return ocfs2_test_bit(bit, bitmap);
879 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
882 int fix = 0, ret, tmpmax;
883 bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
887 ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;