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 #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 */
156 /* Storing max wait in usecs saves 24 bytes per inode */
157 u32 ls_max
; /* Max wait in USEC */
161 struct ocfs2_lock_res
{
163 struct ocfs2_lock_res_ops
*l_ops
;
166 struct list_head l_blocked_list
;
167 struct list_head l_mask_waiters
;
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
;
174 signed char l_requested
;
175 signed char l_blocking
;
177 /* Data packed - type enum ocfs2_lock_type */
178 unsigned char l_type
;
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
;
189 struct ocfs2_dlm_lksb l_lksb
;
191 wait_queue_head_t l_event
;
193 struct list_head l_debug_list
;
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 */
200 #ifdef CONFIG_DEBUG_LOCK_ALLOC
201 struct lockdep_map l_lockdep_map
;
205 enum ocfs2_orphan_scan_state
{
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 */
221 struct ocfs2_dlm_debug
{
222 struct kref d_refcnt
;
223 struct dentry
*d_locking_state
;
224 struct list_head d_lockres_tracking
;
231 VOLUME_MOUNTED_QUOTAS
,
236 struct ocfs2_alloc_stats
240 atomic_t bitmap_data
;
245 enum ocfs2_local_alloc_state
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
256 enum ocfs2_mount_options
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
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
273 OCFS2_MOUNT_HB_NONE
= 1 << 13, /* No heartbeat */
274 OCFS2_MOUNT_HB_GLOBAL
= 1 << 14, /* Global heartbeat */
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
282 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
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
;
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
;
299 struct ocfs2_slot_info
*slot_info
;
301 u32
*slot_recovery_generations
;
303 spinlock_t node_map_lock
;
306 u64 system_dir_blkno
;
313 u64 first_cluster_group_blkno
;
316 u32 s_feature_compat
;
317 u32 s_feature_incompat
;
318 u32 s_feature_ro_compat
;
320 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
321 * Could protect more on osb as it's very short lived.
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
;
331 unsigned long s_mount_opt
;
332 unsigned int s_atime_quantum
;
334 unsigned int max_slots
;
335 unsigned int node_num
;
340 int s_clustersize_bits
;
341 unsigned int s_xattr_inline_size
;
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
;
354 struct delayed_work la_enable_wq
;
357 * Must hold local alloc i_mutex and osb->osb_lock to change
358 * local_alloc_bits. Reads can be done under either lock.
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
364 unsigned int osb_clusters_at_boot
;
366 enum ocfs2_local_alloc_state local_alloc_state
; /* protected
369 struct buffer_head
*local_alloc_bh
;
373 struct ocfs2_reservation_map osb_la_resmap
;
375 unsigned int osb_resv_level
;
376 unsigned int osb_dir_resv_level
;
378 /* Next three fields are for local node slot recovery during
381 struct ocfs2_dinode
*local_alloc_copy
;
382 struct ocfs2_quota_recovery
*quota_rec
;
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 */
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
;
397 struct dentry
*osb_debug_root
;
398 struct dentry
*osb_ctxt
;
400 wait_queue_head_t recovery_event
;
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
;
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().
414 struct list_head blocked_lock_list
;
415 unsigned long blocked_lock_count
;
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
;
422 wait_queue_head_t osb_mount_event
;
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
;
429 * How many clusters in our truncate log.
430 * It must be protected by osb_tl_inode->i_mutex.
432 unsigned int truncated_clusters
;
434 struct ocfs2_node_map osb_recovering_orphan_dirs
;
435 unsigned int *osb_orphan_wipes
;
436 wait_queue_head_t osb_wipe_event
;
438 struct ocfs2_orphan_scan osb_orphan_scan
;
440 /* used to protect metaecc calculation check of xattr. */
441 spinlock_t osb_xattr_lock
;
443 unsigned int osb_dx_mask
;
446 /* the group we used to allocate inodes. */
447 u64 osb_inode_alloc_group
;
449 /* rb tree root for refcount lock. */
450 struct rb_root osb_rf_lock_tree
;
451 struct ocfs2_refcount_tree
*osb_ref_tree_lru
;
454 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
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
);
461 static inline int ocfs2_should_order_data(struct inode
*inode
)
463 if (!S_ISREG(inode
->i_mode
))
465 if (OCFS2_SB(inode
->i_sb
)->s_mount_opt
& OCFS2_MOUNT_DATA_WRITEBACK
)
470 static inline int ocfs2_sparse_alloc(struct ocfs2_super
*osb
)
472 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC
)
477 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super
*osb
)
480 * Support for sparse files is a pre-requisite
482 if (!ocfs2_sparse_alloc(osb
))
485 if (osb
->s_feature_ro_compat
& OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
)
490 static inline int ocfs2_supports_inline_data(struct ocfs2_super
*osb
)
492 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INLINE_DATA
)
497 static inline int ocfs2_supports_xattr(struct ocfs2_super
*osb
)
499 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_XATTR
)
504 static inline int ocfs2_meta_ecc(struct ocfs2_super
*osb
)
506 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_META_ECC
)
511 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super
*osb
)
513 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS
)
518 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super
*osb
)
520 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG
)
525 static inline unsigned int ocfs2_link_max(struct ocfs2_super
*osb
)
527 if (ocfs2_supports_indexed_dirs(osb
))
528 return OCFS2_DX_LINK_MAX
;
529 return OCFS2_LINK_MAX
;
532 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode
*di
)
534 u32 nlink
= le16_to_cpu(di
->i_links_count
);
535 u32 hi
= le16_to_cpu(di
->i_links_count_hi
);
537 if (di
->i_dyn_features
& cpu_to_le16(OCFS2_INDEXED_DIR_FL
))
538 nlink
|= (hi
<< OCFS2_LINKS_HI_SHIFT
);
543 static inline void ocfs2_set_links_count(struct ocfs2_dinode
*di
, u32 nlink
)
548 hi
= nlink
>> OCFS2_LINKS_HI_SHIFT
;
550 di
->i_links_count
= cpu_to_le16(lo
);
551 di
->i_links_count_hi
= cpu_to_le16(hi
);
554 static inline void ocfs2_add_links_count(struct ocfs2_dinode
*di
, int n
)
556 u32 links
= ocfs2_read_links_count(di
);
560 ocfs2_set_links_count(di
, links
);
563 static inline int ocfs2_refcount_tree(struct ocfs2_super
*osb
)
565 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE
)
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
574 static inline void ocfs2_set_osb_flag(struct ocfs2_super
*osb
,
577 spin_lock(&osb
->osb_lock
);
578 osb
->osb_flags
|= flag
;
579 spin_unlock(&osb
->osb_lock
);
583 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super
*osb
,
588 spin_lock(&osb
->osb_lock
);
589 ret
= osb
->osb_flags
& flag
;
590 spin_unlock(&osb
->osb_lock
);
594 static inline void ocfs2_set_ro_flag(struct ocfs2_super
*osb
,
597 spin_lock(&osb
->osb_lock
);
598 osb
->osb_flags
&= ~(OCFS2_OSB_SOFT_RO
|OCFS2_OSB_HARD_RO
);
600 osb
->osb_flags
|= OCFS2_OSB_HARD_RO
;
602 osb
->osb_flags
|= OCFS2_OSB_SOFT_RO
;
603 spin_unlock(&osb
->osb_lock
);
606 static inline int ocfs2_is_hard_readonly(struct ocfs2_super
*osb
)
610 spin_lock(&osb
->osb_lock
);
611 ret
= osb
->osb_flags
& OCFS2_OSB_HARD_RO
;
612 spin_unlock(&osb
->osb_lock
);
617 static inline int ocfs2_is_soft_readonly(struct ocfs2_super
*osb
)
621 spin_lock(&osb
->osb_lock
);
622 ret
= osb
->osb_flags
& OCFS2_OSB_SOFT_RO
;
623 spin_unlock(&osb
->osb_lock
);
628 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super
*osb
)
630 return (osb
->s_feature_incompat
&
631 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK
|
632 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO
));
635 static inline int ocfs2_userspace_stack(struct ocfs2_super
*osb
)
637 if (ocfs2_clusterinfo_valid(osb
) &&
638 memcmp(osb
->osb_cluster_stack
, OCFS2_CLASSIC_CLUSTER_STACK
,
639 OCFS2_STACK_LABEL_LEN
))
644 static inline int ocfs2_o2cb_stack(struct ocfs2_super
*osb
)
646 if (ocfs2_clusterinfo_valid(osb
) &&
647 !memcmp(osb
->osb_cluster_stack
, OCFS2_CLASSIC_CLUSTER_STACK
,
648 OCFS2_STACK_LABEL_LEN
))
653 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super
*osb
)
655 return ocfs2_o2cb_stack(osb
) &&
656 (osb
->osb_stackflags
& OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT
);
659 static inline int ocfs2_mount_local(struct ocfs2_super
*osb
)
661 return (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
);
664 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super
*osb
)
666 return (osb
->s_feature_incompat
&
667 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
);
671 #define OCFS2_IS_VALID_DINODE(ptr) \
672 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
674 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
675 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
677 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
678 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
681 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
682 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
684 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
685 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
687 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
688 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
690 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
691 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
693 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
694 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
696 static inline unsigned long ino_from_blkno(struct super_block
*sb
,
699 return (unsigned long)(blkno
& (u64
)ULONG_MAX
);
702 static inline u64
ocfs2_clusters_to_blocks(struct super_block
*sb
,
705 int c_to_b_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
706 sb
->s_blocksize_bits
;
708 return (u64
)clusters
<< c_to_b_bits
;
711 static inline u32
ocfs2_blocks_to_clusters(struct super_block
*sb
,
714 int b_to_c_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
715 sb
->s_blocksize_bits
;
717 return (u32
)(blocks
>> b_to_c_bits
);
720 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block
*sb
,
723 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
724 unsigned int clusters
;
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
);
733 static inline u64
ocfs2_blocks_for_bytes(struct super_block
*sb
,
736 bytes
+= sb
->s_blocksize
- 1;
737 return bytes
>> sb
->s_blocksize_bits
;
740 static inline u64
ocfs2_clusters_to_bytes(struct super_block
*sb
,
743 return (u64
)clusters
<< OCFS2_SB(sb
)->s_clustersize_bits
;
746 static inline u64
ocfs2_block_to_cluster_start(struct super_block
*sb
,
749 int bits
= OCFS2_SB(sb
)->s_clustersize_bits
- sb
->s_blocksize_bits
;
750 unsigned int clusters
;
752 clusters
= ocfs2_blocks_to_clusters(sb
, blocks
);
753 return (u64
)clusters
<< bits
;
756 static inline u64
ocfs2_align_bytes_to_clusters(struct super_block
*sb
,
759 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
760 unsigned int clusters
;
762 clusters
= ocfs2_clusters_for_bytes(sb
, bytes
);
763 return (u64
)clusters
<< cl_bits
;
766 static inline u64
ocfs2_align_bytes_to_blocks(struct super_block
*sb
,
771 blocks
= ocfs2_blocks_for_bytes(sb
, bytes
);
772 return blocks
<< sb
->s_blocksize_bits
;
775 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes
)
777 return (unsigned long)((bytes
+ 511) >> 9);
780 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block
*sb
,
781 unsigned long pg_index
)
783 u32 clusters
= pg_index
;
784 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
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
);
795 * Find the 1st page index which covers the given clusters.
797 static inline pgoff_t
ocfs2_align_clusters_to_page_index(struct super_block
*sb
,
800 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
801 pgoff_t index
= clusters
;
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
);
812 static inline unsigned int ocfs2_pages_per_cluster(struct super_block
*sb
)
814 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
815 unsigned int pages_per_cluster
= 1;
817 if (PAGE_CACHE_SHIFT
< cbits
)
818 pages_per_cluster
= 1 << (cbits
- PAGE_CACHE_SHIFT
);
820 return pages_per_cluster
;
823 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block
*sb
,
826 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE
> 1048576);
828 return megs
<< (20 - OCFS2_SB(sb
)->s_clustersize_bits
);
831 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block
*sb
,
832 unsigned int clusters
)
834 return clusters
>> (20 - OCFS2_SB(sb
)->s_clustersize_bits
);
837 static inline void _ocfs2_set_bit(unsigned int bit
, unsigned long *bitmap
)
839 __set_bit_le(bit
, bitmap
);
841 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
843 static inline void _ocfs2_clear_bit(unsigned int bit
, unsigned long *bitmap
)
845 __clear_bit_le(bit
, bitmap
);
847 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
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