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 #ifndef CONFIG_OCFS2_COMPAT_JBD
39 # include <linux/jbd2.h>
41 # include <linux/jbd.h>
42 # include "ocfs2_jbd_compat.h"
45 /* For union ocfs2_dlm_lksb */
46 #include "stackglue.h"
49 #include "ocfs2_lockid.h"
51 /* For struct ocfs2_blockcheck_stats */
52 #include "blockcheck.h"
55 /* Caching of metadata buffers */
57 /* Most user visible OCFS2 inodes will have very few pieces of
58 * metadata, but larger files (including bitmaps, etc) must be taken
59 * into account when designing an access scheme. We allow a small
60 * amount of inlined blocks to be stored on an array and grow the
61 * structure into a rb tree when necessary. */
62 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
64 /* Flags for ocfs2_caching_info */
66 enum ocfs2_caching_info_flags
{
67 /* Indicates that the metadata cache is using the inline array */
68 OCFS2_CACHE_FL_INLINE
= 1<<1,
71 struct ocfs2_caching_operations
;
72 struct ocfs2_caching_info
{
74 * The parent structure provides the locks, but because the
75 * parent structure can differ, it provides locking operations
76 * to struct ocfs2_caching_info.
78 const struct ocfs2_caching_operations
*ci_ops
;
80 unsigned int ci_flags
;
81 unsigned int ci_num_cached
;
83 sector_t ci_array
[OCFS2_CACHE_INFO_MAX_ARRAY
];
84 struct rb_root ci_tree
;
88 /* this limits us to 256 nodes
89 * if we need more, we can do a kmalloc for the map */
90 #define OCFS2_NODE_MAP_MAX_NODES 256
91 struct ocfs2_node_map
{
93 unsigned long map
[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES
)];
96 enum ocfs2_ast_action
{
97 OCFS2_AST_INVALID
= 0,
100 OCFS2_AST_DOWNCONVERT
,
103 /* actions for an unlockast function to take. */
104 enum ocfs2_unlock_action
{
105 OCFS2_UNLOCK_INVALID
= 0,
106 OCFS2_UNLOCK_CANCEL_CONVERT
,
107 OCFS2_UNLOCK_DROP_LOCK
,
110 /* ocfs2_lock_res->l_flags flags. */
111 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
113 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
115 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
117 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
118 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
119 #define OCFS2_LOCK_REFRESHING (0x00000020)
120 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
121 * for shutdown paths */
122 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
123 * when to skip queueing
124 * a lock because it's
127 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
128 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
129 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
130 call to dlm_lock. Only
131 exists with BUSY set. */
133 struct ocfs2_lock_res_ops
;
135 typedef void (*ocfs2_lock_callback
)(int status
, unsigned long data
);
137 struct ocfs2_lock_res
{
139 struct ocfs2_lock_res_ops
*l_ops
;
142 struct list_head l_blocked_list
;
143 struct list_head l_mask_waiters
;
145 enum ocfs2_lock_type l_type
;
146 unsigned long l_flags
;
147 char l_name
[OCFS2_LOCK_ID_MAX_LEN
];
149 unsigned int l_ro_holders
;
150 unsigned int l_ex_holders
;
151 union ocfs2_dlm_lksb l_lksb
;
153 /* used from AST/BAST funcs. */
154 enum ocfs2_ast_action l_action
;
155 enum ocfs2_unlock_action l_unlock_action
;
158 unsigned int l_pending_gen
;
160 wait_queue_head_t l_event
;
162 struct list_head l_debug_list
;
164 #ifdef CONFIG_OCFS2_FS_STATS
165 unsigned long long l_lock_num_prmode
; /* PR acquires */
166 unsigned long long l_lock_num_exmode
; /* EX acquires */
167 unsigned int l_lock_num_prmode_failed
; /* Failed PR gets */
168 unsigned int l_lock_num_exmode_failed
; /* Failed EX gets */
169 unsigned long long l_lock_total_prmode
; /* Tot wait for PR */
170 unsigned long long l_lock_total_exmode
; /* Tot wait for EX */
171 unsigned int l_lock_max_prmode
; /* Max wait for PR */
172 unsigned int l_lock_max_exmode
; /* Max wait for EX */
173 unsigned int l_lock_refresh
; /* Disk refreshes */
175 #ifdef CONFIG_DEBUG_LOCK_ALLOC
176 struct lockdep_map l_lockdep_map
;
180 enum ocfs2_orphan_scan_state
{
185 struct ocfs2_orphan_scan
{
186 struct mutex os_lock
;
187 struct ocfs2_super
*os_osb
;
188 struct ocfs2_lock_res os_lockres
; /* lock to synchronize scans */
189 struct delayed_work os_orphan_scan_work
;
190 struct timespec os_scantime
; /* time this node ran the scan */
191 u32 os_count
; /* tracks node specific scans */
192 u32 os_seqno
; /* tracks cluster wide scans */
193 atomic_t os_state
; /* ACTIVE or INACTIVE */
196 struct ocfs2_dlm_debug
{
197 struct kref d_refcnt
;
198 struct dentry
*d_locking_state
;
199 struct list_head d_lockres_tracking
;
206 VOLUME_MOUNTED_QUOTAS
,
211 struct ocfs2_alloc_stats
215 atomic_t bitmap_data
;
220 enum ocfs2_local_alloc_state
222 OCFS2_LA_UNUSED
= 0, /* Local alloc will never be used for
223 * this mountpoint. */
224 OCFS2_LA_ENABLED
, /* Local alloc is in use. */
225 OCFS2_LA_THROTTLED
, /* Local alloc is in use, but number
226 * of bits has been reduced. */
227 OCFS2_LA_DISABLED
/* Local alloc has temporarily been
231 enum ocfs2_mount_options
233 OCFS2_MOUNT_HB_LOCAL
= 1 << 0, /* Heartbeat started in local mode */
234 OCFS2_MOUNT_BARRIER
= 1 << 1, /* Use block barriers */
235 OCFS2_MOUNT_NOINTR
= 1 << 2, /* Don't catch signals */
236 OCFS2_MOUNT_ERRORS_PANIC
= 1 << 3, /* Panic on errors */
237 OCFS2_MOUNT_DATA_WRITEBACK
= 1 << 4, /* No data ordering */
238 OCFS2_MOUNT_LOCALFLOCKS
= 1 << 5, /* No cluster aware user file locks */
239 OCFS2_MOUNT_NOUSERXATTR
= 1 << 6, /* No user xattr */
240 OCFS2_MOUNT_INODE64
= 1 << 7, /* Allow inode numbers > 2^32 */
241 OCFS2_MOUNT_POSIX_ACL
= 1 << 8, /* POSIX access control lists */
242 OCFS2_MOUNT_USRQUOTA
= 1 << 9, /* We support user quotas */
243 OCFS2_MOUNT_GRPQUOTA
= 1 << 10, /* We support group quotas */
246 #define OCFS2_OSB_SOFT_RO 0x0001
247 #define OCFS2_OSB_HARD_RO 0x0002
248 #define OCFS2_OSB_ERROR_FS 0x0004
249 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
251 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
253 struct ocfs2_journal
;
254 struct ocfs2_slot_info
;
255 struct ocfs2_recovery_map
;
256 struct ocfs2_replay_map
;
257 struct ocfs2_quota_recovery
;
258 struct ocfs2_dentry_lock
;
261 struct task_struct
*commit_task
;
262 struct super_block
*sb
;
263 struct inode
*root_inode
;
264 struct inode
*sys_root_inode
;
265 struct inode
*system_inodes
[NUM_SYSTEM_INODES
];
267 struct ocfs2_slot_info
*slot_info
;
269 u32
*slot_recovery_generations
;
271 spinlock_t node_map_lock
;
274 u64 system_dir_blkno
;
281 u64 first_cluster_group_blkno
;
284 u32 s_feature_compat
;
285 u32 s_feature_incompat
;
286 u32 s_feature_ro_compat
;
288 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
289 * Could protect more on osb as it's very short lived.
292 u32 s_next_generation
;
293 unsigned long osb_flags
;
294 s16 s_inode_steal_slot
;
295 atomic_t s_num_inodes_stolen
;
297 unsigned long s_mount_opt
;
298 unsigned int s_atime_quantum
;
300 unsigned int max_slots
;
301 unsigned int node_num
;
306 int s_clustersize_bits
;
307 unsigned int s_xattr_inline_size
;
310 struct mutex recovery_lock
;
311 struct ocfs2_recovery_map
*recovery_map
;
312 struct ocfs2_replay_map
*replay_map
;
313 struct task_struct
*recovery_thread_task
;
314 int disable_recovery
;
315 wait_queue_head_t checkpoint_event
;
316 atomic_t needs_checkpoint
;
317 struct ocfs2_journal
*journal
;
318 unsigned long osb_commit_interval
;
320 struct delayed_work la_enable_wq
;
323 * Must hold local alloc i_mutex and osb->osb_lock to change
324 * local_alloc_bits. Reads can be done under either lock.
326 unsigned int local_alloc_bits
;
327 unsigned int local_alloc_default_bits
;
329 enum ocfs2_local_alloc_state local_alloc_state
; /* protected
332 struct buffer_head
*local_alloc_bh
;
336 /* Next three fields are for local node slot recovery during
339 struct ocfs2_dinode
*local_alloc_copy
;
340 struct ocfs2_quota_recovery
*quota_rec
;
342 struct ocfs2_blockcheck_stats osb_ecc_stats
;
343 struct ocfs2_alloc_stats alloc_stats
;
344 char dev_str
[20]; /* "major,minor" of the device */
346 char osb_cluster_stack
[OCFS2_STACK_LABEL_LEN
+ 1];
347 struct ocfs2_cluster_connection
*cconn
;
348 struct ocfs2_lock_res osb_super_lockres
;
349 struct ocfs2_lock_res osb_rename_lockres
;
350 struct ocfs2_lock_res osb_nfs_sync_lockres
;
351 struct ocfs2_dlm_debug
*osb_dlm_debug
;
353 struct dentry
*osb_debug_root
;
354 struct dentry
*osb_ctxt
;
356 wait_queue_head_t recovery_event
;
358 spinlock_t dc_task_lock
;
359 struct task_struct
*dc_task
;
360 wait_queue_head_t dc_event
;
361 unsigned long dc_wake_sequence
;
362 unsigned long dc_work_sequence
;
365 * Any thread can add locks to the list, but the downconvert
366 * thread is the only one allowed to remove locks. Any change
367 * to this rule requires updating
368 * ocfs2_downconvert_thread_do_work().
370 struct list_head blocked_lock_list
;
371 unsigned long blocked_lock_count
;
373 /* List of dentry locks to release. Anyone can add locks to
374 * the list, ocfs2_wq processes the list */
375 struct ocfs2_dentry_lock
*dentry_lock_list
;
376 struct work_struct dentry_lock_work
;
378 wait_queue_head_t osb_mount_event
;
380 /* Truncate log info */
381 struct inode
*osb_tl_inode
;
382 struct buffer_head
*osb_tl_bh
;
383 struct delayed_work osb_truncate_log_wq
;
385 struct ocfs2_node_map osb_recovering_orphan_dirs
;
386 unsigned int *osb_orphan_wipes
;
387 wait_queue_head_t osb_wipe_event
;
389 struct ocfs2_orphan_scan osb_orphan_scan
;
391 /* used to protect metaecc calculation check of xattr. */
392 spinlock_t osb_xattr_lock
;
394 unsigned int osb_dx_mask
;
397 /* the group we used to allocate inodes. */
398 u64 osb_inode_alloc_group
;
401 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
403 /* Useful typedef for passing around journal access functions */
404 typedef int (*ocfs2_journal_access_func
)(handle_t
*handle
, struct inode
*inode
,
405 struct buffer_head
*bh
, int type
);
407 static inline int ocfs2_should_order_data(struct inode
*inode
)
409 if (!S_ISREG(inode
->i_mode
))
411 if (OCFS2_SB(inode
->i_sb
)->s_mount_opt
& OCFS2_MOUNT_DATA_WRITEBACK
)
416 static inline int ocfs2_sparse_alloc(struct ocfs2_super
*osb
)
418 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC
)
423 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super
*osb
)
426 * Support for sparse files is a pre-requisite
428 if (!ocfs2_sparse_alloc(osb
))
431 if (osb
->s_feature_ro_compat
& OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
)
436 static inline int ocfs2_supports_inline_data(struct ocfs2_super
*osb
)
438 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INLINE_DATA
)
443 static inline int ocfs2_supports_xattr(struct ocfs2_super
*osb
)
445 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_XATTR
)
450 static inline int ocfs2_meta_ecc(struct ocfs2_super
*osb
)
452 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_META_ECC
)
457 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super
*osb
)
459 if (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS
)
464 static inline unsigned int ocfs2_link_max(struct ocfs2_super
*osb
)
466 if (ocfs2_supports_indexed_dirs(osb
))
467 return OCFS2_DX_LINK_MAX
;
468 return OCFS2_LINK_MAX
;
471 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode
*di
)
473 u32 nlink
= le16_to_cpu(di
->i_links_count
);
474 u32 hi
= le16_to_cpu(di
->i_links_count_hi
);
476 if (di
->i_dyn_features
& cpu_to_le16(OCFS2_INDEXED_DIR_FL
))
477 nlink
|= (hi
<< OCFS2_LINKS_HI_SHIFT
);
482 static inline void ocfs2_set_links_count(struct ocfs2_dinode
*di
, u32 nlink
)
487 hi
= nlink
>> OCFS2_LINKS_HI_SHIFT
;
489 di
->i_links_count
= cpu_to_le16(lo
);
490 di
->i_links_count_hi
= cpu_to_le16(hi
);
493 static inline void ocfs2_add_links_count(struct ocfs2_dinode
*di
, int n
)
495 u32 links
= ocfs2_read_links_count(di
);
499 ocfs2_set_links_count(di
, links
);
502 /* set / clear functions because cluster events can make these happen
503 * in parallel so we want the transitions to be atomic. this also
504 * means that any future flags osb_flags must be protected by spinlock
506 static inline void ocfs2_set_osb_flag(struct ocfs2_super
*osb
,
509 spin_lock(&osb
->osb_lock
);
510 osb
->osb_flags
|= flag
;
511 spin_unlock(&osb
->osb_lock
);
515 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super
*osb
,
520 spin_lock(&osb
->osb_lock
);
521 ret
= osb
->osb_flags
& flag
;
522 spin_unlock(&osb
->osb_lock
);
526 static inline void ocfs2_set_ro_flag(struct ocfs2_super
*osb
,
529 spin_lock(&osb
->osb_lock
);
530 osb
->osb_flags
&= ~(OCFS2_OSB_SOFT_RO
|OCFS2_OSB_HARD_RO
);
532 osb
->osb_flags
|= OCFS2_OSB_HARD_RO
;
534 osb
->osb_flags
|= OCFS2_OSB_SOFT_RO
;
535 spin_unlock(&osb
->osb_lock
);
538 static inline int ocfs2_is_hard_readonly(struct ocfs2_super
*osb
)
542 spin_lock(&osb
->osb_lock
);
543 ret
= osb
->osb_flags
& OCFS2_OSB_HARD_RO
;
544 spin_unlock(&osb
->osb_lock
);
549 static inline int ocfs2_is_soft_readonly(struct ocfs2_super
*osb
)
553 spin_lock(&osb
->osb_lock
);
554 ret
= osb
->osb_flags
& OCFS2_OSB_SOFT_RO
;
555 spin_unlock(&osb
->osb_lock
);
560 static inline int ocfs2_userspace_stack(struct ocfs2_super
*osb
)
562 return (osb
->s_feature_incompat
&
563 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK
);
566 static inline int ocfs2_mount_local(struct ocfs2_super
*osb
)
568 return (osb
->s_feature_incompat
& OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
);
571 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super
*osb
)
573 return (osb
->s_feature_incompat
&
574 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
);
578 #define OCFS2_IS_VALID_DINODE(ptr) \
579 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
581 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
582 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
584 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
585 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
588 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
589 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
591 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
592 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
594 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
595 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
597 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
598 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
600 static inline unsigned long ino_from_blkno(struct super_block
*sb
,
603 return (unsigned long)(blkno
& (u64
)ULONG_MAX
);
606 static inline u64
ocfs2_clusters_to_blocks(struct super_block
*sb
,
609 int c_to_b_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
610 sb
->s_blocksize_bits
;
612 return (u64
)clusters
<< c_to_b_bits
;
615 static inline u32
ocfs2_blocks_to_clusters(struct super_block
*sb
,
618 int b_to_c_bits
= OCFS2_SB(sb
)->s_clustersize_bits
-
619 sb
->s_blocksize_bits
;
621 return (u32
)(blocks
>> b_to_c_bits
);
624 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block
*sb
,
627 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
628 unsigned int clusters
;
630 bytes
+= OCFS2_SB(sb
)->s_clustersize
- 1;
631 /* OCFS2 just cannot have enough clusters to overflow this */
632 clusters
= (unsigned int)(bytes
>> cl_bits
);
637 static inline u64
ocfs2_blocks_for_bytes(struct super_block
*sb
,
640 bytes
+= sb
->s_blocksize
- 1;
641 return bytes
>> sb
->s_blocksize_bits
;
644 static inline u64
ocfs2_clusters_to_bytes(struct super_block
*sb
,
647 return (u64
)clusters
<< OCFS2_SB(sb
)->s_clustersize_bits
;
650 static inline u64
ocfs2_block_to_cluster_start(struct super_block
*sb
,
653 int bits
= OCFS2_SB(sb
)->s_clustersize_bits
- sb
->s_blocksize_bits
;
654 unsigned int clusters
;
656 clusters
= ocfs2_blocks_to_clusters(sb
, blocks
);
657 return (u64
)clusters
<< bits
;
660 static inline u64
ocfs2_align_bytes_to_clusters(struct super_block
*sb
,
663 int cl_bits
= OCFS2_SB(sb
)->s_clustersize_bits
;
664 unsigned int clusters
;
666 clusters
= ocfs2_clusters_for_bytes(sb
, bytes
);
667 return (u64
)clusters
<< cl_bits
;
670 static inline u64
ocfs2_align_bytes_to_blocks(struct super_block
*sb
,
675 blocks
= ocfs2_blocks_for_bytes(sb
, bytes
);
676 return blocks
<< sb
->s_blocksize_bits
;
679 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes
)
681 return (unsigned long)((bytes
+ 511) >> 9);
684 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block
*sb
,
685 unsigned long pg_index
)
687 u32 clusters
= pg_index
;
688 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
690 if (unlikely(PAGE_CACHE_SHIFT
> cbits
))
691 clusters
= pg_index
<< (PAGE_CACHE_SHIFT
- cbits
);
692 else if (PAGE_CACHE_SHIFT
< cbits
)
693 clusters
= pg_index
>> (cbits
- PAGE_CACHE_SHIFT
);
699 * Find the 1st page index which covers the given clusters.
701 static inline pgoff_t
ocfs2_align_clusters_to_page_index(struct super_block
*sb
,
704 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
705 pgoff_t index
= clusters
;
707 if (PAGE_CACHE_SHIFT
> cbits
) {
708 index
= (pgoff_t
)clusters
>> (PAGE_CACHE_SHIFT
- cbits
);
709 } else if (PAGE_CACHE_SHIFT
< cbits
) {
710 index
= (pgoff_t
)clusters
<< (cbits
- PAGE_CACHE_SHIFT
);
716 static inline unsigned int ocfs2_pages_per_cluster(struct super_block
*sb
)
718 unsigned int cbits
= OCFS2_SB(sb
)->s_clustersize_bits
;
719 unsigned int pages_per_cluster
= 1;
721 if (PAGE_CACHE_SHIFT
< cbits
)
722 pages_per_cluster
= 1 << (cbits
- PAGE_CACHE_SHIFT
);
724 return pages_per_cluster
;
727 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block
*sb
,
730 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE
> 1048576);
732 return megs
<< (20 - OCFS2_SB(sb
)->s_clustersize_bits
);
735 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super
*osb
)
737 spin_lock(&osb
->osb_lock
);
738 osb
->s_inode_steal_slot
= OCFS2_INVALID_SLOT
;
739 spin_unlock(&osb
->osb_lock
);
740 atomic_set(&osb
->s_num_inodes_stolen
, 0);
743 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super
*osb
,
746 spin_lock(&osb
->osb_lock
);
747 osb
->s_inode_steal_slot
= slot
;
748 spin_unlock(&osb
->osb_lock
);
751 static inline s16
ocfs2_get_inode_steal_slot(struct ocfs2_super
*osb
)
755 spin_lock(&osb
->osb_lock
);
756 slot
= osb
->s_inode_steal_slot
;
757 spin_unlock(&osb
->osb_lock
);
762 #define ocfs2_set_bit ext2_set_bit
763 #define ocfs2_clear_bit ext2_clear_bit
764 #define ocfs2_test_bit ext2_test_bit
765 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
766 #define ocfs2_find_next_bit ext2_find_next_bit