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 /* next two are protected by trans_inc_lock */
81 /* which transaction were we created on? Zero if none. */
82 unsigned long ci_created_trans;
83 /* last transaction we were a part of. */
84 unsigned long ci_last_trans;
86 /* Cache structures */
87 unsigned int ci_flags;
88 unsigned int ci_num_cached;
90 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
91 struct rb_root ci_tree;
95 * Need this prototype here instead of in uptodate.h because journal.h
98 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
100 /* this limits us to 256 nodes
101 * if we need more, we can do a kmalloc for the map */
102 #define OCFS2_NODE_MAP_MAX_NODES 256
103 struct ocfs2_node_map {
105 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
108 enum ocfs2_ast_action {
109 OCFS2_AST_INVALID = 0,
112 OCFS2_AST_DOWNCONVERT,
115 /* actions for an unlockast function to take. */
116 enum ocfs2_unlock_action {
117 OCFS2_UNLOCK_INVALID = 0,
118 OCFS2_UNLOCK_CANCEL_CONVERT,
119 OCFS2_UNLOCK_DROP_LOCK,
122 /* ocfs2_lock_res->l_flags flags. */
123 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
125 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
127 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
129 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
130 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
131 #define OCFS2_LOCK_REFRESHING (0x00000020)
132 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
133 * for shutdown paths */
134 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
135 * when to skip queueing
136 * a lock because it's
139 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
140 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
141 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
142 call to dlm_lock. Only
143 exists with BUSY set. */
145 struct ocfs2_lock_res_ops;
147 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
149 struct ocfs2_lock_res {
151 struct ocfs2_lock_res_ops *l_ops;
154 struct list_head l_blocked_list;
155 struct list_head l_mask_waiters;
157 enum ocfs2_lock_type l_type;
158 unsigned long l_flags;
159 char l_name[OCFS2_LOCK_ID_MAX_LEN];
161 unsigned int l_ro_holders;
162 unsigned int l_ex_holders;
163 union ocfs2_dlm_lksb l_lksb;
165 /* used from AST/BAST funcs. */
166 enum ocfs2_ast_action l_action;
167 enum ocfs2_unlock_action l_unlock_action;
170 unsigned int l_pending_gen;
172 wait_queue_head_t l_event;
174 struct list_head l_debug_list;
176 #ifdef CONFIG_OCFS2_FS_STATS
177 unsigned long long l_lock_num_prmode; /* PR acquires */
178 unsigned long long l_lock_num_exmode; /* EX acquires */
179 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
180 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
181 unsigned long long l_lock_total_prmode; /* Tot wait for PR */
182 unsigned long long l_lock_total_exmode; /* Tot wait for EX */
183 unsigned int l_lock_max_prmode; /* Max wait for PR */
184 unsigned int l_lock_max_exmode; /* Max wait for EX */
185 unsigned int l_lock_refresh; /* Disk refreshes */
187 #ifdef CONFIG_DEBUG_LOCK_ALLOC
188 struct lockdep_map l_lockdep_map;
192 enum ocfs2_orphan_scan_state {
197 struct ocfs2_orphan_scan {
198 struct mutex os_lock;
199 struct ocfs2_super *os_osb;
200 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */
201 struct delayed_work os_orphan_scan_work;
202 struct timespec os_scantime; /* time this node ran the scan */
203 u32 os_count; /* tracks node specific scans */
204 u32 os_seqno; /* tracks cluster wide scans */
205 atomic_t os_state; /* ACTIVE or INACTIVE */
208 struct ocfs2_dlm_debug {
209 struct kref d_refcnt;
210 struct dentry *d_locking_state;
211 struct list_head d_lockres_tracking;
218 VOLUME_MOUNTED_QUOTAS,
223 struct ocfs2_alloc_stats
227 atomic_t bitmap_data;
232 enum ocfs2_local_alloc_state
234 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
235 * this mountpoint. */
236 OCFS2_LA_ENABLED, /* Local alloc is in use. */
237 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
238 * of bits has been reduced. */
239 OCFS2_LA_DISABLED /* Local alloc has temporarily been
243 enum ocfs2_mount_options
245 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
246 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
247 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
248 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
249 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
250 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
251 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
252 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
253 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
254 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access
256 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
257 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
260 #define OCFS2_OSB_SOFT_RO 0x0001
261 #define OCFS2_OSB_HARD_RO 0x0002
262 #define OCFS2_OSB_ERROR_FS 0x0004
263 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
265 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
267 struct ocfs2_journal;
268 struct ocfs2_slot_info;
269 struct ocfs2_recovery_map;
270 struct ocfs2_replay_map;
271 struct ocfs2_quota_recovery;
272 struct ocfs2_dentry_lock;
275 struct task_struct *commit_task;
276 struct super_block *sb;
277 struct inode *root_inode;
278 struct inode *sys_root_inode;
279 struct inode *system_inodes[NUM_SYSTEM_INODES];
281 struct ocfs2_slot_info *slot_info;
283 u32 *slot_recovery_generations;
285 spinlock_t node_map_lock;
288 u64 system_dir_blkno;
295 u64 first_cluster_group_blkno;
298 u32 s_feature_compat;
299 u32 s_feature_incompat;
300 u32 s_feature_ro_compat;
302 /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
303 * Could protect more on osb as it's very short lived.
306 u32 s_next_generation;
307 unsigned long osb_flags;
308 s16 s_inode_steal_slot;
309 atomic_t s_num_inodes_stolen;
311 unsigned long s_mount_opt;
312 unsigned int s_atime_quantum;
314 unsigned int max_slots;
315 unsigned int node_num;
320 int s_clustersize_bits;
321 unsigned int s_xattr_inline_size;
324 struct mutex recovery_lock;
325 struct ocfs2_recovery_map *recovery_map;
326 struct ocfs2_replay_map *replay_map;
327 struct task_struct *recovery_thread_task;
328 int disable_recovery;
329 wait_queue_head_t checkpoint_event;
330 atomic_t needs_checkpoint;
331 struct ocfs2_journal *journal;
332 unsigned long osb_commit_interval;
334 struct delayed_work la_enable_wq;
337 * Must hold local alloc i_mutex and osb->osb_lock to change
338 * local_alloc_bits. Reads can be done under either lock.
340 unsigned int local_alloc_bits;
341 unsigned int local_alloc_default_bits;
343 enum ocfs2_local_alloc_state local_alloc_state; /* protected
346 struct buffer_head *local_alloc_bh;
350 /* Next three fields are for local node slot recovery during
353 struct ocfs2_dinode *local_alloc_copy;
354 struct ocfs2_quota_recovery *quota_rec;
356 struct ocfs2_blockcheck_stats osb_ecc_stats;
357 struct ocfs2_alloc_stats alloc_stats;
358 char dev_str[20]; /* "major,minor" of the device */
360 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
361 struct ocfs2_cluster_connection *cconn;
362 struct ocfs2_lock_res osb_super_lockres;
363 struct ocfs2_lock_res osb_rename_lockres;
364 struct ocfs2_lock_res osb_nfs_sync_lockres;
365 struct ocfs2_dlm_debug *osb_dlm_debug;
367 struct dentry *osb_debug_root;
368 struct dentry *osb_ctxt;
370 wait_queue_head_t recovery_event;
372 spinlock_t dc_task_lock;
373 struct task_struct *dc_task;
374 wait_queue_head_t dc_event;
375 unsigned long dc_wake_sequence;
376 unsigned long dc_work_sequence;
379 * Any thread can add locks to the list, but the downconvert
380 * thread is the only one allowed to remove locks. Any change
381 * to this rule requires updating
382 * ocfs2_downconvert_thread_do_work().
384 struct list_head blocked_lock_list;
385 unsigned long blocked_lock_count;
387 /* List of dentry locks to release. Anyone can add locks to
388 * the list, ocfs2_wq processes the list */
389 struct ocfs2_dentry_lock *dentry_lock_list;
390 struct work_struct dentry_lock_work;
392 wait_queue_head_t osb_mount_event;
394 /* Truncate log info */
395 struct inode *osb_tl_inode;
396 struct buffer_head *osb_tl_bh;
397 struct delayed_work osb_truncate_log_wq;
399 struct ocfs2_node_map osb_recovering_orphan_dirs;
400 unsigned int *osb_orphan_wipes;
401 wait_queue_head_t osb_wipe_event;
403 struct ocfs2_orphan_scan osb_orphan_scan;
405 /* used to protect metaecc calculation check of xattr. */
406 spinlock_t osb_xattr_lock;
408 unsigned int osb_dx_mask;
411 /* the group we used to allocate inodes. */
412 u64 osb_inode_alloc_group;
414 /* rb tree root for refcount lock. */
415 struct rb_root osb_rf_lock_tree;
416 struct ocfs2_refcount_tree *osb_ref_tree_lru;
419 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
421 /* Useful typedef for passing around journal access functions */
422 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
423 struct ocfs2_caching_info *ci,
424 struct buffer_head *bh, int type);
426 static inline int ocfs2_should_order_data(struct inode *inode)
428 if (!S_ISREG(inode->i_mode))
430 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
435 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
437 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
442 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
445 * Support for sparse files is a pre-requisite
447 if (!ocfs2_sparse_alloc(osb))
450 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
455 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
457 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
462 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
464 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
469 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
471 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
476 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
478 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
483 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
485 if (ocfs2_supports_indexed_dirs(osb))
486 return OCFS2_DX_LINK_MAX;
487 return OCFS2_LINK_MAX;
490 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
492 u32 nlink = le16_to_cpu(di->i_links_count);
493 u32 hi = le16_to_cpu(di->i_links_count_hi);
495 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
496 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
501 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
506 hi = nlink >> OCFS2_LINKS_HI_SHIFT;
508 di->i_links_count = cpu_to_le16(lo);
509 di->i_links_count_hi = cpu_to_le16(hi);
512 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
514 u32 links = ocfs2_read_links_count(di);
518 ocfs2_set_links_count(di, links);
521 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
523 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
528 /* set / clear functions because cluster events can make these happen
529 * in parallel so we want the transitions to be atomic. this also
530 * means that any future flags osb_flags must be protected by spinlock
532 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
535 spin_lock(&osb->osb_lock);
536 osb->osb_flags |= flag;
537 spin_unlock(&osb->osb_lock);
541 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
546 spin_lock(&osb->osb_lock);
547 ret = osb->osb_flags & flag;
548 spin_unlock(&osb->osb_lock);
552 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
555 spin_lock(&osb->osb_lock);
556 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
558 osb->osb_flags |= OCFS2_OSB_HARD_RO;
560 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
561 spin_unlock(&osb->osb_lock);
564 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
568 spin_lock(&osb->osb_lock);
569 ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
570 spin_unlock(&osb->osb_lock);
575 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
579 spin_lock(&osb->osb_lock);
580 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
581 spin_unlock(&osb->osb_lock);
586 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
588 return (osb->s_feature_incompat &
589 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
592 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
594 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
597 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
599 return (osb->s_feature_incompat &
600 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
604 #define OCFS2_IS_VALID_DINODE(ptr) \
605 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
607 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
608 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
610 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \
611 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
614 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
615 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
617 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
618 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
620 #define OCFS2_IS_VALID_DX_ROOT(ptr) \
621 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
623 #define OCFS2_IS_VALID_DX_LEAF(ptr) \
624 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
626 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
627 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
629 static inline unsigned long ino_from_blkno(struct super_block *sb,
632 return (unsigned long)(blkno & (u64)ULONG_MAX);
635 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
638 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
639 sb->s_blocksize_bits;
641 return (u64)clusters << c_to_b_bits;
644 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
647 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
648 sb->s_blocksize_bits;
650 return (u32)(blocks >> b_to_c_bits);
653 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
656 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
657 unsigned int clusters;
659 bytes += OCFS2_SB(sb)->s_clustersize - 1;
660 /* OCFS2 just cannot have enough clusters to overflow this */
661 clusters = (unsigned int)(bytes >> cl_bits);
666 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
669 bytes += sb->s_blocksize - 1;
670 return bytes >> sb->s_blocksize_bits;
673 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
676 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
679 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
682 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
683 unsigned int clusters;
685 clusters = ocfs2_blocks_to_clusters(sb, blocks);
686 return (u64)clusters << bits;
689 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
692 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
693 unsigned int clusters;
695 clusters = ocfs2_clusters_for_bytes(sb, bytes);
696 return (u64)clusters << cl_bits;
699 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
704 blocks = ocfs2_blocks_for_bytes(sb, bytes);
705 return blocks << sb->s_blocksize_bits;
708 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
710 return (unsigned long)((bytes + 511) >> 9);
713 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
714 unsigned long pg_index)
716 u32 clusters = pg_index;
717 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
719 if (unlikely(PAGE_CACHE_SHIFT > cbits))
720 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
721 else if (PAGE_CACHE_SHIFT < cbits)
722 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
728 * Find the 1st page index which covers the given clusters.
730 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
733 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
734 pgoff_t index = clusters;
736 if (PAGE_CACHE_SHIFT > cbits) {
737 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
738 } else if (PAGE_CACHE_SHIFT < cbits) {
739 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
745 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
747 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
748 unsigned int pages_per_cluster = 1;
750 if (PAGE_CACHE_SHIFT < cbits)
751 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
753 return pages_per_cluster;
756 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
759 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
761 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
764 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
766 spin_lock(&osb->osb_lock);
767 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
768 spin_unlock(&osb->osb_lock);
769 atomic_set(&osb->s_num_inodes_stolen, 0);
772 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb,
775 spin_lock(&osb->osb_lock);
776 osb->s_inode_steal_slot = slot;
777 spin_unlock(&osb->osb_lock);
780 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
784 spin_lock(&osb->osb_lock);
785 slot = osb->s_inode_steal_slot;
786 spin_unlock(&osb->osb_lock);
791 #define ocfs2_set_bit ext2_set_bit
792 #define ocfs2_clear_bit ext2_clear_bit
793 #define ocfs2_test_bit ext2_test_bit
794 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
795 #define ocfs2_find_next_bit ext2_find_next_bit