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"
46 /* For struct ocfs2_blockcheck_stats */
47 #include "blockcheck.h"
50 /* Caching of metadata buffers */
52 /* Most user visible OCFS2 inodes will have very few pieces of
53 * metadata, but larger files (including bitmaps, etc) must be taken
54 * into account when designing an access scheme. We allow a small
55 * amount of inlined blocks to be stored on an array and grow the
56 * structure into a rb tree when necessary. */
57 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
59 /* Flags for ocfs2_caching_info */
61 enum ocfs2_caching_info_flags
{
62 /* Indicates that the metadata cache is using the inline array */
63 OCFS2_CACHE_FL_INLINE
= 1<<1,
66 struct ocfs2_caching_operations
;
67 struct ocfs2_caching_info
{
69 * The parent structure provides the locks, but because the
70 * parent structure can differ, it provides locking operations
71 * to struct ocfs2_caching_info.
73 const struct ocfs2_caching_operations
*ci_ops
;
75 /* next two are protected by trans_inc_lock */
76 /* which transaction were we created on? Zero if none. */
77 unsigned long ci_created_trans
;
78 /* last transaction we were a part of. */
79 unsigned long ci_last_trans
;
81 /* Cache structures */
82 unsigned int ci_flags
;
83 unsigned int ci_num_cached
;
85 sector_t ci_array
[OCFS2_CACHE_INFO_MAX_ARRAY
];
86 struct rb_root ci_tree
;
90 * Need this prototype here instead of in uptodate.h because journal.h
93 struct super_block
*ocfs2_metadata_cache_get_super(struct ocfs2_caching_info
*ci
);
95 /* this limits us to 256 nodes
96 * if we need more, we can do a kmalloc for the map */
97 #define OCFS2_NODE_MAP_MAX_NODES 256
98 struct ocfs2_node_map
{
100 unsigned long map
[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES
)];
103 enum ocfs2_ast_action
{
104 OCFS2_AST_INVALID
= 0,
107 OCFS2_AST_DOWNCONVERT
,
110 /* actions for an unlockast function to take. */
111 enum ocfs2_unlock_action
{
112 OCFS2_UNLOCK_INVALID
= 0,
113 OCFS2_UNLOCK_CANCEL_CONVERT
,
114 OCFS2_UNLOCK_DROP_LOCK
,
117 /* ocfs2_lock_res->l_flags flags. */
118 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
120 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
122 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
124 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
125 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
126 #define OCFS2_LOCK_REFRESHING (0x00000020)
127 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
128 * for shutdown paths */
129 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
130 * when to skip queueing
131 * a lock because it's
134 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
135 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
136 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
137 call to dlm_lock. Only
138 exists with BUSY set. */
140 struct ocfs2_lock_res_ops
;
142 typedef void (*ocfs2_lock_callback
)(int status
, unsigned long data
);
144 struct ocfs2_lock_res
{
146 struct ocfs2_lock_res_ops
*l_ops
;
149 struct list_head l_blocked_list
;
150 struct list_head l_mask_waiters
;
152 enum ocfs2_lock_type l_type
;
153 unsigned long l_flags
;
154 char l_name
[OCFS2_LOCK_ID_MAX_LEN
];
156 unsigned int l_ro_holders
;
157 unsigned int l_ex_holders
;
158 union ocfs2_dlm_lksb l_lksb
;
160 /* used from AST/BAST funcs. */
161 enum ocfs2_ast_action l_action
;
162 enum ocfs2_unlock_action l_unlock_action
;
165 unsigned int l_pending_gen
;
167 wait_queue_head_t l_event
;
169 struct list_head l_debug_list
;
171 #ifdef CONFIG_OCFS2_FS_STATS
172 unsigned long long l_lock_num_prmode
; /* PR acquires */
173 unsigned long long l_lock_num_exmode
; /* EX acquires */
174 unsigned int l_lock_num_prmode_failed
; /* Failed PR gets */
175 unsigned int l_lock_num_exmode_failed
; /* Failed EX gets */
176 unsigned long long l_lock_total_prmode
; /* Tot wait for PR */
177 unsigned long long l_lock_total_exmode
; /* Tot wait for EX */
178 unsigned int l_lock_max_prmode
; /* Max wait for PR */
179 unsigned int l_lock_max_exmode
; /* Max wait for EX */
180 unsigned int l_lock_refresh
; /* Disk refreshes */
182 #ifdef CONFIG_DEBUG_LOCK_ALLOC
183 struct lockdep_map l_lockdep_map
;
187 enum ocfs2_orphan_scan_state
{
192 struct ocfs2_orphan_scan
{
193 struct mutex os_lock
;
194 struct ocfs2_super
*os_osb
;
195 struct ocfs2_lock_res os_lockres
; /* lock to synchronize scans */
196 struct delayed_work os_orphan_scan_work
;
197 struct timespec os_scantime
; /* time this node ran the scan */
198 u32 os_count
; /* tracks node specific scans */
199 u32 os_seqno
; /* tracks cluster wide scans */
200 atomic_t os_state
; /* ACTIVE or INACTIVE */
203 struct ocfs2_dlm_debug
{
204 struct kref d_refcnt
;
205 struct dentry
*d_locking_state
;
206 struct list_head d_lockres_tracking
;
213 VOLUME_MOUNTED_QUOTAS
,
218 struct ocfs2_alloc_stats
222 atomic_t bitmap_data
;
227 enum ocfs2_local_alloc_state
229 OCFS2_LA_UNUSED
= 0, /* Local alloc will never be used for
230 * this mountpoint. */
231 OCFS2_LA_ENABLED
, /* Local alloc is in use. */
232 OCFS2_LA_THROTTLED
, /* Local alloc is in use, but number
233 * of bits has been reduced. */
234 OCFS2_LA_DISABLED
/* Local alloc has temporarily been
238 enum ocfs2_mount_options
240 OCFS2_MOUNT_HB_LOCAL
= 1 << 0, /* Heartbeat started in local mode */
241 OCFS2_MOUNT_BARRIER
= 1 << 1, /* Use block barriers */
242 OCFS2_MOUNT_NOINTR
= 1 << 2, /* Don't catch signals */
243 OCFS2_MOUNT_ERRORS_PANIC
= 1 << 3, /* Panic on errors */
244 OCFS2_MOUNT_DATA_WRITEBACK
= 1 << 4, /* No data ordering */
245 OCFS2_MOUNT_LOCALFLOCKS
= 1 << 5, /* No cluster aware user file locks */
246 OCFS2_MOUNT_NOUSERXATTR
= 1 << 6, /* No user xattr */
247 OCFS2_MOUNT_INODE64
= 1 << 7, /* Allow inode numbers > 2^32 */
248 OCFS2_MOUNT_POSIX_ACL
= 1 << 8, /* POSIX access control lists */
249 OCFS2_MOUNT_USRQUOTA
= 1 << 9, /* We support user quotas */
250 OCFS2_MOUNT_GRPQUOTA
= 1 << 10, /* We support group quotas */
253 #define OCFS2_OSB_SOFT_RO 0x0001
254 #define OCFS2_OSB_HARD_RO 0x0002
255 #define OCFS2_OSB_ERROR_FS 0x0004
256 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
258 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
260 struct ocfs2_journal
;
261 struct ocfs2_slot_info
;
262 struct ocfs2_recovery_map
;
263 struct ocfs2_replay_map
;
264 struct ocfs2_quota_recovery
;
265 struct ocfs2_dentry_lock
;
268 struct task_struct
*commit_task
;
269 struct super_block
*sb
;
270 struct inode
*root_inode
;
271 struct inode
*sys_root_inode
;
272 struct inode
*system_inodes
[NUM_SYSTEM_INODES
];
274 struct ocfs2_slot_info
*slot_info
;
276 u32
*slot_recovery_generations
;
278 spinlock_t node_map_lock
;
281 u64 system_dir_blkno
;
288 u64 first_cluster_group_blkno
;
291 u32 s_feature_compat
;
292 u32 s_feature_incompat
;
293 u32 s_feature_ro_compat
;
295 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
296 * Could protect more on osb as it's very short lived.
299 u32 s_next_generation
;
300 unsigned long osb_flags
;
301 s16 s_inode_steal_slot
;
302 atomic_t s_num_inodes_stolen
;
304 unsigned long s_mount_opt
;
305 unsigned int s_atime_quantum
;
307 unsigned int max_slots
;
308 unsigned int node_num
;
313 int s_clustersize_bits
;
314 unsigned int s_xattr_inline_size
;
317 struct mutex recovery_lock
;
318 struct ocfs2_recovery_map
*recovery_map
;
319 struct ocfs2_replay_map
*replay_map
;
320 struct task_struct
*recovery_thread_task
;
321 int disable_recovery
;
322 wait_queue_head_t checkpoint_event
;
323 atomic_t needs_checkpoint
;
324 struct ocfs2_journal
*journal
;
325 unsigned long osb_commit_interval
;
327 struct delayed_work la_enable_wq
;
330 * Must hold local alloc i_mutex and osb->osb_lock to change
331 * local_alloc_bits. Reads can be done under either lock.
333 unsigned int local_alloc_bits
;
334 unsigned int local_alloc_default_bits
;
336 enum ocfs2_local_alloc_state local_alloc_state
; /* protected
339 struct buffer_head
*local_alloc_bh
;
343 /* Next three fields are for local node slot recovery during
346 struct ocfs2_dinode
*local_alloc_copy
;
347 struct ocfs2_quota_recovery
*quota_rec
;
349 struct ocfs2_blockcheck_stats osb_ecc_stats
;
350 struct ocfs2_alloc_stats alloc_stats
;
351 char dev_str
[20]; /* "major,minor" of the device */
353 char osb_cluster_stack
[OCFS2_STACK_LABEL_LEN
+ 1];
354 struct ocfs2_cluster_connection
*cconn
;
355 struct ocfs2_lock_res osb_super_lockres
;
356 struct ocfs2_lock_res osb_rename_lockres
;
357 struct ocfs2_lock_res osb_nfs_sync_lockres
;
358 struct ocfs2_dlm_debug
*osb_dlm_debug
;
360 struct dentry
*osb_debug_root
;
361 struct dentry
*osb_ctxt
;
363 wait_queue_head_t recovery_event
;
365 spinlock_t dc_task_lock
;
366 struct task_struct
*dc_task
;
367 wait_queue_head_t dc_event
;
368 unsigned long dc_wake_sequence
;
369 unsigned long dc_work_sequence
;
372 * Any thread can add locks to the list, but the downconvert
373 * thread is the only one allowed to remove locks. Any change
374 * to this rule requires updating
375 * ocfs2_downconvert_thread_do_work().
377 struct list_head blocked_lock_list
;
378 unsigned long blocked_lock_count
;
380 /* List of dentry locks to release. Anyone can add locks to
381 * the list, ocfs2_wq processes the list */
382 struct ocfs2_dentry_lock
*dentry_lock_list
;
383 struct work_struct dentry_lock_work
;
385 wait_queue_head_t osb_mount_event
;
387 /* Truncate log info */
388 struct inode
*osb_tl_inode
;
389 struct buffer_head
*osb_tl_bh
;
390 struct delayed_work osb_truncate_log_wq
;
392 struct ocfs2_node_map osb_recovering_orphan_dirs
;
393 unsigned int *osb_orphan_wipes
;
394 wait_queue_head_t osb_wipe_event
;
396 struct ocfs2_orphan_scan osb_orphan_scan
;
398 /* used to protect metaecc calculation check of xattr. */
399 spinlock_t osb_xattr_lock
;
401 unsigned int osb_dx_mask
;
404 /* the group we used to allocate inodes. */
405 u64 osb_inode_alloc_group
;
407 /* rb tree root for refcount lock. */
408 struct rb_root osb_rf_lock_tree
;
409 struct ocfs2_refcount_tree
*osb_ref_tree_lru
;
412 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
414 /* Useful typedef for passing around journal access functions */
415 typedef int (*ocfs2_journal_access_func
)(handle_t
*handle
,
416 struct ocfs2_caching_info
*ci
,
417 struct buffer_head
*bh
, int type
);
419 static inline int ocfs2_should_order_data(struct inode
*inode
)
421 if (!S_ISREG(inode
->i_mode
))
423 if (OCFS2_SB(inode
->i_sb
)->s_mount_opt
& OCFS2_MOUNT_DATA_WRITEBACK
)
428 static inline int ocfs2_sparse_alloc(struct ocfs2_super
*osb
)
430 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC
)
435 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super
*osb
)
438 * Support for sparse files is a pre-requisite
440 if (!ocfs2_sparse_alloc(osb
))
443 if (osb
->s_feature_ro_compat
& OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
)
448 static inline int ocfs2_supports_inline_data(struct ocfs2_super
*osb
)
450 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INLINE_DATA
)
455 static inline int ocfs2_supports_xattr(struct ocfs2_super
*osb
)
457 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_XATTR
)
462 static inline int ocfs2_meta_ecc(struct ocfs2_super
*osb
)
464 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_META_ECC
)
469 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super
*osb
)
471 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS
)
476 static inline unsigned int ocfs2_link_max(struct ocfs2_super
*osb
)
478 if (ocfs2_supports_indexed_dirs(osb
))
479 return OCFS2_DX_LINK_MAX
;
480 return OCFS2_LINK_MAX
;
483 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode
*di
)
485 u32 nlink
= le16_to_cpu(di
->i_links_count
);
486 u32 hi
= le16_to_cpu(di
->i_links_count_hi
);
488 if (di
->i_dyn_features
& cpu_to_le16(OCFS2_INDEXED_DIR_FL
))
489 nlink
|= (hi
<< OCFS2_LINKS_HI_SHIFT
);
494 static inline void ocfs2_set_links_count(struct ocfs2_dinode
*di
, u32 nlink
)
499 hi
= nlink
>> OCFS2_LINKS_HI_SHIFT
;
501 di
->i_links_count
= cpu_to_le16(lo
);
502 di
->i_links_count_hi
= cpu_to_le16(hi
);
505 static inline void ocfs2_add_links_count(struct ocfs2_dinode
*di
, int n
)
507 u32 links
= ocfs2_read_links_count(di
);
511 ocfs2_set_links_count(di
, links
);
514 static inline int ocfs2_refcount_tree(struct ocfs2_super
*osb
)
516 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE
)
521 /* set / clear functions because cluster events can make these happen
522 * in parallel so we want the transitions to be atomic. this also
523 * means that any future flags osb_flags must be protected by spinlock
525 static inline void ocfs2_set_osb_flag(struct ocfs2_super
*osb
,
528 spin_lock(&osb
->osb_lock
);
529 osb
->osb_flags
|= flag
;
530 spin_unlock(&osb
->osb_lock
);
534 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super
*osb
,
539 spin_lock(&osb
->osb_lock
);
540 ret
= osb
->osb_flags
& flag
;
541 spin_unlock(&osb
->osb_lock
);
545 static inline void ocfs2_set_ro_flag(struct ocfs2_super
*osb
,
548 spin_lock(&osb
->osb_lock
);
549 osb
->osb_flags
&= ~(OCFS2_OSB_SOFT_RO
|OCFS2_OSB_HARD_RO
);
551 osb
->osb_flags
|= OCFS2_OSB_HARD_RO
;
553 osb
->osb_flags
|= OCFS2_OSB_SOFT_RO
;
554 spin_unlock(&osb
->osb_lock
);
557 static inline int ocfs2_is_hard_readonly(struct ocfs2_super
*osb
)
561 spin_lock(&osb
->osb_lock
);
562 ret
= osb
->osb_flags
& OCFS2_OSB_HARD_RO
;
563 spin_unlock(&osb
->osb_lock
);
568 static inline int ocfs2_is_soft_readonly(struct ocfs2_super
*osb
)
572 spin_lock(&osb
->osb_lock
);
573 ret
= osb
->osb_flags
& OCFS2_OSB_SOFT_RO
;
574 spin_unlock(&osb
->osb_lock
);
579 static inline int ocfs2_userspace_stack(struct ocfs2_super
*osb
)
581 return (osb
->s_feature_incompat
&
582 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK
);
585 static inline int ocfs2_mount_local(struct ocfs2_super
*osb
)
587 return (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
);
590 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super
*osb
)
592 return (osb
->s_feature_incompat
&
593 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
);
597 #define OCFS2_IS_VALID_DINODE(ptr) \
598 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
600 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
601 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
603 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
604 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
607 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
608 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
610 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
611 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
613 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
614 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
616 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
617 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
619 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
620 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
622 static inline unsigned long ino_from_blkno(struct super_block
*sb
,
625 return (unsigned long)(blkno
& (u64
)ULONG_MAX
);
628 static inline u64
ocfs2_clusters_to_blocks(struct super_block
*sb
,
631 int c_to_b_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
632 sb
->s_blocksize_bits
;
634 return (u64
)clusters
<< c_to_b_bits
;
637 static inline u32
ocfs2_blocks_to_clusters(struct super_block
*sb
,
640 int b_to_c_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
641 sb
->s_blocksize_bits
;
643 return (u32
)(blocks
>> b_to_c_bits
);
646 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block
*sb
,
649 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
650 unsigned int clusters
;
652 bytes
+= OCFS2_SB(sb
)->s_clustersize
- 1;
653 /* OCFS2 just cannot have enough clusters to overflow this */
654 clusters
= (unsigned int)(bytes
>> cl_bits
);
659 static inline u64
ocfs2_blocks_for_bytes(struct super_block
*sb
,
662 bytes
+= sb
->s_blocksize
- 1;
663 return bytes
>> sb
->s_blocksize_bits
;
666 static inline u64
ocfs2_clusters_to_bytes(struct super_block
*sb
,
669 return (u64
)clusters
<< OCFS2_SB(sb
)->s_clustersize_bits
;
672 static inline u64
ocfs2_block_to_cluster_start(struct super_block
*sb
,
675 int bits
= OCFS2_SB(sb
)->s_clustersize_bits
- sb
->s_blocksize_bits
;
676 unsigned int clusters
;
678 clusters
= ocfs2_blocks_to_clusters(sb
, blocks
);
679 return (u64
)clusters
<< bits
;
682 static inline u64
ocfs2_align_bytes_to_clusters(struct super_block
*sb
,
685 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
686 unsigned int clusters
;
688 clusters
= ocfs2_clusters_for_bytes(sb
, bytes
);
689 return (u64
)clusters
<< cl_bits
;
692 static inline u64
ocfs2_align_bytes_to_blocks(struct super_block
*sb
,
697 blocks
= ocfs2_blocks_for_bytes(sb
, bytes
);
698 return blocks
<< sb
->s_blocksize_bits
;
701 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes
)
703 return (unsigned long)((bytes
+ 511) >> 9);
706 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block
*sb
,
707 unsigned long pg_index
)
709 u32 clusters
= pg_index
;
710 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
712 if (unlikely(PAGE_CACHE_SHIFT
> cbits
))
713 clusters
= pg_index
<< (PAGE_CACHE_SHIFT
- cbits
);
714 else if (PAGE_CACHE_SHIFT
< cbits
)
715 clusters
= pg_index
>> (cbits
- PAGE_CACHE_SHIFT
);
721 * Find the 1st page index which covers the given clusters.
723 static inline pgoff_t
ocfs2_align_clusters_to_page_index(struct super_block
*sb
,
726 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
727 pgoff_t index
= clusters
;
729 if (PAGE_CACHE_SHIFT
> cbits
) {
730 index
= (pgoff_t
)clusters
>> (PAGE_CACHE_SHIFT
- cbits
);
731 } else if (PAGE_CACHE_SHIFT
< cbits
) {
732 index
= (pgoff_t
)clusters
<< (cbits
- PAGE_CACHE_SHIFT
);
738 static inline unsigned int ocfs2_pages_per_cluster(struct super_block
*sb
)
740 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
741 unsigned int pages_per_cluster
= 1;
743 if (PAGE_CACHE_SHIFT
< cbits
)
744 pages_per_cluster
= 1 << (cbits
- PAGE_CACHE_SHIFT
);
746 return pages_per_cluster
;
749 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block
*sb
,
752 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE
> 1048576);
754 return megs
<< (20 - OCFS2_SB(sb
)->s_clustersize_bits
);
757 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super
*osb
)
759 spin_lock(&osb
->osb_lock
);
760 osb
->s_inode_steal_slot
= OCFS2_INVALID_SLOT
;
761 spin_unlock(&osb
->osb_lock
);
762 atomic_set(&osb
->s_num_inodes_stolen
, 0);
765 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super
*osb
,
768 spin_lock(&osb
->osb_lock
);
769 osb
->s_inode_steal_slot
= slot
;
770 spin_unlock(&osb
->osb_lock
);
773 static inline s16
ocfs2_get_inode_steal_slot(struct ocfs2_super
*osb
)
777 spin_lock(&osb
->osb_lock
);
778 slot
= osb
->s_inode_steal_slot
;
779 spin_unlock(&osb
->osb_lock
);
784 #define ocfs2_set_bit ext2_set_bit
785 #define ocfs2_clear_bit ext2_clear_bit
786 #define ocfs2_test_bit ext2_test_bit
787 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
788 #define ocfs2_find_next_bit ext2_find_next_bit