Root/fs/ocfs2/ocfs2.h

1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2.h
5 *
6 * Defines macros and structures used in OCFS2
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
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.
14 *
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.
19 *
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.
24 */
25
26#ifndef OCFS2_H
27#define OCFS2_H
28
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>
39
40/* For union ocfs2_dlm_lksb */
41#include "stackglue.h"
42
43#include "ocfs2_fs.h"
44#include "ocfs2_lockid.h"
45#include "ocfs2_ioctl.h"
46
47/* For struct ocfs2_blockcheck_stats */
48#include "blockcheck.h"
49
50
51/* Caching of metadata buffers */
52
53/* Most user visible OCFS2 inodes will have very few pieces of
54 * metadata, but larger files (including bitmaps, etc) must be taken
55 * into account when designing an access scheme. We allow a small
56 * amount of inlined blocks to be stored on an array and grow the
57 * structure into a rb tree when necessary. */
58#define OCFS2_CACHE_INFO_MAX_ARRAY 2
59
60/* Flags for ocfs2_caching_info */
61
62enum ocfs2_caching_info_flags {
63    /* Indicates that the metadata cache is using the inline array */
64    OCFS2_CACHE_FL_INLINE = 1<<1,
65};
66
67struct ocfs2_caching_operations;
68struct ocfs2_caching_info {
69    /*
70     * The parent structure provides the locks, but because the
71     * parent structure can differ, it provides locking operations
72     * to struct ocfs2_caching_info.
73     */
74    const struct ocfs2_caching_operations *ci_ops;
75
76    /* next two are protected by trans_inc_lock */
77    /* which transaction were we created on? Zero if none. */
78    unsigned long ci_created_trans;
79    /* last transaction we were a part of. */
80    unsigned long ci_last_trans;
81
82    /* Cache structures */
83    unsigned int ci_flags;
84    unsigned int ci_num_cached;
85    union {
86    sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
87        struct rb_root ci_tree;
88    } ci_cache;
89};
90/*
91 * Need this prototype here instead of in uptodate.h because journal.h
92 * uses it.
93 */
94struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
95
96/* this limits us to 256 nodes
97 * if we need more, we can do a kmalloc for the map */
98#define OCFS2_NODE_MAP_MAX_NODES 256
99struct ocfs2_node_map {
100    u16 num_nodes;
101    unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
102};
103
104enum ocfs2_ast_action {
105    OCFS2_AST_INVALID = 0,
106    OCFS2_AST_ATTACH,
107    OCFS2_AST_CONVERT,
108    OCFS2_AST_DOWNCONVERT,
109};
110
111/* actions for an unlockast function to take. */
112enum ocfs2_unlock_action {
113    OCFS2_UNLOCK_INVALID = 0,
114    OCFS2_UNLOCK_CANCEL_CONVERT,
115    OCFS2_UNLOCK_DROP_LOCK,
116};
117
118/* ocfs2_lock_res->l_flags flags. */
119#define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
120                           * the lvb */
121#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
122                           * dlm_lock */
123#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
124                           * downconvert*/
125#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
126#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
127#define OCFS2_LOCK_REFRESHING (0x00000020)
128#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
129                           * for shutdown paths */
130#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
131                           * when to skip queueing
132                           * a lock because it's
133                           * about to be
134                           * dropped. */
135#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
136#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
137#define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
138                         call to dlm_lock. Only
139                         exists with BUSY set. */
140#define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
141                             * from downconverting
142                             * before the upconvert
143                             * has completed */
144
145struct ocfs2_lock_res_ops;
146
147typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
148
149struct ocfs2_lock_res {
150    void *l_priv;
151    struct ocfs2_lock_res_ops *l_ops;
152    spinlock_t l_lock;
153
154    struct list_head l_blocked_list;
155    struct list_head l_mask_waiters;
156
157    enum ocfs2_lock_type l_type;
158    unsigned long l_flags;
159    char l_name[OCFS2_LOCK_ID_MAX_LEN];
160    int l_level;
161    unsigned int l_ro_holders;
162    unsigned int l_ex_holders;
163    struct ocfs2_dlm_lksb l_lksb;
164
165    /* used from AST/BAST funcs. */
166    enum ocfs2_ast_action l_action;
167    enum ocfs2_unlock_action l_unlock_action;
168    int l_requested;
169    int l_blocking;
170    unsigned int l_pending_gen;
171
172    wait_queue_head_t l_event;
173
174    struct list_head l_debug_list;
175
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 */
186#endif
187#ifdef CONFIG_DEBUG_LOCK_ALLOC
188    struct lockdep_map l_lockdep_map;
189#endif
190};
191
192enum ocfs2_orphan_scan_state {
193    ORPHAN_SCAN_ACTIVE,
194    ORPHAN_SCAN_INACTIVE
195};
196
197struct 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 */
206};
207
208struct ocfs2_dlm_debug {
209    struct kref d_refcnt;
210    struct dentry *d_locking_state;
211    struct list_head d_lockres_tracking;
212};
213
214enum ocfs2_vol_state
215{
216    VOLUME_INIT = 0,
217    VOLUME_MOUNTED,
218    VOLUME_MOUNTED_QUOTAS,
219    VOLUME_DISMOUNTED,
220    VOLUME_DISABLED
221};
222
223struct ocfs2_alloc_stats
224{
225    atomic_t moves;
226    atomic_t local_data;
227    atomic_t bitmap_data;
228    atomic_t bg_allocs;
229    atomic_t bg_extends;
230};
231
232enum ocfs2_local_alloc_state
233{
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
240                 * disabled. */
241};
242
243enum ocfs2_mount_options
244{
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
255                           control lists */
256    OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
257    OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
258};
259
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
264
265#define OCFS2_DEFAULT_ATIME_QUANTUM 60
266
267struct ocfs2_journal;
268struct ocfs2_slot_info;
269struct ocfs2_recovery_map;
270struct ocfs2_replay_map;
271struct ocfs2_quota_recovery;
272struct ocfs2_dentry_lock;
273struct ocfs2_super
274{
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];
280
281    struct ocfs2_slot_info *slot_info;
282
283    u32 *slot_recovery_generations;
284
285    spinlock_t node_map_lock;
286
287    u64 root_blkno;
288    u64 system_dir_blkno;
289    u64 bitmap_blkno;
290    u32 bitmap_cpg;
291    u8 *uuid;
292    char *uuid_str;
293    u32 uuid_hash;
294    u8 *vol_label;
295    u64 first_cluster_group_blkno;
296    u32 fs_generation;
297
298    u32 s_feature_compat;
299    u32 s_feature_incompat;
300    u32 s_feature_ro_compat;
301
302    /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
303     * Could protect more on osb as it's very short lived.
304     */
305    spinlock_t osb_lock;
306    u32 s_next_generation;
307    unsigned long osb_flags;
308    s16 s_inode_steal_slot;
309    s16 s_meta_steal_slot;
310    atomic_t s_num_inodes_stolen;
311    atomic_t s_num_meta_stolen;
312
313    unsigned long s_mount_opt;
314    unsigned int s_atime_quantum;
315
316    unsigned int max_slots;
317    unsigned int node_num;
318    int slot_num;
319    int preferred_slot;
320    int s_sectsize_bits;
321    int s_clustersize;
322    int s_clustersize_bits;
323    unsigned int s_xattr_inline_size;
324
325    atomic_t vol_state;
326    struct mutex recovery_lock;
327    struct ocfs2_recovery_map *recovery_map;
328    struct ocfs2_replay_map *replay_map;
329    struct task_struct *recovery_thread_task;
330    int disable_recovery;
331    wait_queue_head_t checkpoint_event;
332    atomic_t needs_checkpoint;
333    struct ocfs2_journal *journal;
334    unsigned long osb_commit_interval;
335
336    struct delayed_work la_enable_wq;
337
338    /*
339     * Must hold local alloc i_mutex and osb->osb_lock to change
340     * local_alloc_bits. Reads can be done under either lock.
341     */
342    unsigned int local_alloc_bits;
343    unsigned int local_alloc_default_bits;
344
345    enum ocfs2_local_alloc_state local_alloc_state; /* protected
346                             * by osb_lock */
347
348    struct buffer_head *local_alloc_bh;
349
350    u64 la_last_gd;
351
352    /* Next three fields are for local node slot recovery during
353     * mount. */
354    int dirty;
355    struct ocfs2_dinode *local_alloc_copy;
356    struct ocfs2_quota_recovery *quota_rec;
357
358    struct ocfs2_blockcheck_stats osb_ecc_stats;
359    struct ocfs2_alloc_stats alloc_stats;
360    char dev_str[20]; /* "major,minor" of the device */
361
362    char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
363    struct ocfs2_cluster_connection *cconn;
364    struct ocfs2_lock_res osb_super_lockres;
365    struct ocfs2_lock_res osb_rename_lockres;
366    struct ocfs2_lock_res osb_nfs_sync_lockres;
367    struct ocfs2_dlm_debug *osb_dlm_debug;
368
369    struct dentry *osb_debug_root;
370    struct dentry *osb_ctxt;
371
372    wait_queue_head_t recovery_event;
373
374    spinlock_t dc_task_lock;
375    struct task_struct *dc_task;
376    wait_queue_head_t dc_event;
377    unsigned long dc_wake_sequence;
378    unsigned long dc_work_sequence;
379
380    /*
381     * Any thread can add locks to the list, but the downconvert
382     * thread is the only one allowed to remove locks. Any change
383     * to this rule requires updating
384     * ocfs2_downconvert_thread_do_work().
385     */
386    struct list_head blocked_lock_list;
387    unsigned long blocked_lock_count;
388
389    /* List of dentry locks to release. Anyone can add locks to
390     * the list, ocfs2_wq processes the list */
391    struct ocfs2_dentry_lock *dentry_lock_list;
392    struct work_struct dentry_lock_work;
393
394    wait_queue_head_t osb_mount_event;
395
396    /* Truncate log info */
397    struct inode *osb_tl_inode;
398    struct buffer_head *osb_tl_bh;
399    struct delayed_work osb_truncate_log_wq;
400
401    struct ocfs2_node_map osb_recovering_orphan_dirs;
402    unsigned int *osb_orphan_wipes;
403    wait_queue_head_t osb_wipe_event;
404
405    struct ocfs2_orphan_scan osb_orphan_scan;
406
407    /* used to protect metaecc calculation check of xattr. */
408    spinlock_t osb_xattr_lock;
409
410    unsigned int osb_dx_mask;
411    u32 osb_dx_seed[4];
412
413    /* the group we used to allocate inodes. */
414    u64 osb_inode_alloc_group;
415
416    /* rb tree root for refcount lock. */
417    struct rb_root osb_rf_lock_tree;
418    struct ocfs2_refcount_tree *osb_ref_tree_lru;
419};
420
421#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
422
423/* Useful typedef for passing around journal access functions */
424typedef int (*ocfs2_journal_access_func)(handle_t *handle,
425                     struct ocfs2_caching_info *ci,
426                     struct buffer_head *bh, int type);
427
428static inline int ocfs2_should_order_data(struct inode *inode)
429{
430    if (!S_ISREG(inode->i_mode))
431        return 0;
432    if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
433        return 0;
434    return 1;
435}
436
437static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
438{
439    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
440        return 1;
441    return 0;
442}
443
444static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
445{
446    /*
447     * Support for sparse files is a pre-requisite
448     */
449    if (!ocfs2_sparse_alloc(osb))
450        return 0;
451
452    if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
453        return 1;
454    return 0;
455}
456
457static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
458{
459    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
460        return 1;
461    return 0;
462}
463
464static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
465{
466    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
467        return 1;
468    return 0;
469}
470
471static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
472{
473    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
474        return 1;
475    return 0;
476}
477
478static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
479{
480    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
481        return 1;
482    return 0;
483}
484
485static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
486{
487    if (ocfs2_supports_indexed_dirs(osb))
488        return OCFS2_DX_LINK_MAX;
489    return OCFS2_LINK_MAX;
490}
491
492static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
493{
494    u32 nlink = le16_to_cpu(di->i_links_count);
495    u32 hi = le16_to_cpu(di->i_links_count_hi);
496
497    if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
498        nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
499
500    return nlink;
501}
502
503static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
504{
505    u16 lo, hi;
506
507    lo = nlink;
508    hi = nlink >> OCFS2_LINKS_HI_SHIFT;
509
510    di->i_links_count = cpu_to_le16(lo);
511    di->i_links_count_hi = cpu_to_le16(hi);
512}
513
514static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
515{
516    u32 links = ocfs2_read_links_count(di);
517
518    links += n;
519
520    ocfs2_set_links_count(di, links);
521}
522
523static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
524{
525    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
526        return 1;
527    return 0;
528}
529
530/* set / clear functions because cluster events can make these happen
531 * in parallel so we want the transitions to be atomic. this also
532 * means that any future flags osb_flags must be protected by spinlock
533 * too! */
534static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
535                      unsigned long flag)
536{
537    spin_lock(&osb->osb_lock);
538    osb->osb_flags |= flag;
539    spin_unlock(&osb->osb_lock);
540}
541
542
543static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
544                         unsigned long flag)
545{
546    unsigned long ret;
547
548    spin_lock(&osb->osb_lock);
549    ret = osb->osb_flags & flag;
550    spin_unlock(&osb->osb_lock);
551    return ret;
552}
553
554static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
555                     int hard)
556{
557    spin_lock(&osb->osb_lock);
558    osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
559    if (hard)
560        osb->osb_flags |= OCFS2_OSB_HARD_RO;
561    else
562        osb->osb_flags |= OCFS2_OSB_SOFT_RO;
563    spin_unlock(&osb->osb_lock);
564}
565
566static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
567{
568    int ret;
569
570    spin_lock(&osb->osb_lock);
571    ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
572    spin_unlock(&osb->osb_lock);
573
574    return ret;
575}
576
577static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
578{
579    int ret;
580
581    spin_lock(&osb->osb_lock);
582    ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
583    spin_unlock(&osb->osb_lock);
584
585    return ret;
586}
587
588static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
589{
590    return (osb->s_feature_incompat &
591        OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
592}
593
594static inline int ocfs2_mount_local(struct ocfs2_super *osb)
595{
596    return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
597}
598
599static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
600{
601    return (osb->s_feature_incompat &
602        OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
603}
604
605
606#define OCFS2_IS_VALID_DINODE(ptr) \
607    (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
608
609#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
610    (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
611
612#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
613    (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
614
615
616#define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
617    (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
618
619#define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
620    (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
621
622#define OCFS2_IS_VALID_DX_ROOT(ptr) \
623    (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
624
625#define OCFS2_IS_VALID_DX_LEAF(ptr) \
626    (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
627
628#define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
629    (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
630
631static inline unsigned long ino_from_blkno(struct super_block *sb,
632                       u64 blkno)
633{
634    return (unsigned long)(blkno & (u64)ULONG_MAX);
635}
636
637static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
638                       u32 clusters)
639{
640    int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
641        sb->s_blocksize_bits;
642
643    return (u64)clusters << c_to_b_bits;
644}
645
646static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
647                       u64 blocks)
648{
649    int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
650        sb->s_blocksize_bits;
651
652    return (u32)(blocks >> b_to_c_bits);
653}
654
655static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
656                            u64 bytes)
657{
658    int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
659    unsigned int clusters;
660
661    bytes += OCFS2_SB(sb)->s_clustersize - 1;
662    /* OCFS2 just cannot have enough clusters to overflow this */
663    clusters = (unsigned int)(bytes >> cl_bits);
664
665    return clusters;
666}
667
668static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
669                     u64 bytes)
670{
671    bytes += sb->s_blocksize - 1;
672    return bytes >> sb->s_blocksize_bits;
673}
674
675static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
676                      u32 clusters)
677{
678    return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
679}
680
681static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
682                           u64 blocks)
683{
684    int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
685    unsigned int clusters;
686
687    clusters = ocfs2_blocks_to_clusters(sb, blocks);
688    return (u64)clusters << bits;
689}
690
691static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
692                        u64 bytes)
693{
694    int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
695    unsigned int clusters;
696
697    clusters = ocfs2_clusters_for_bytes(sb, bytes);
698    return (u64)clusters << cl_bits;
699}
700
701static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
702                          u64 bytes)
703{
704    u64 blocks;
705
706        blocks = ocfs2_blocks_for_bytes(sb, bytes);
707    return blocks << sb->s_blocksize_bits;
708}
709
710static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
711{
712    return (unsigned long)((bytes + 511) >> 9);
713}
714
715static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
716                            unsigned long pg_index)
717{
718    u32 clusters = pg_index;
719    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
720
721    if (unlikely(PAGE_CACHE_SHIFT > cbits))
722        clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
723    else if (PAGE_CACHE_SHIFT < cbits)
724        clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
725
726    return clusters;
727}
728
729/*
730 * Find the 1st page index which covers the given clusters.
731 */
732static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
733                            u32 clusters)
734{
735    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
736        pgoff_t index = clusters;
737
738    if (PAGE_CACHE_SHIFT > cbits) {
739        index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
740    } else if (PAGE_CACHE_SHIFT < cbits) {
741        index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
742    }
743
744    return index;
745}
746
747static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
748{
749    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
750    unsigned int pages_per_cluster = 1;
751
752    if (PAGE_CACHE_SHIFT < cbits)
753        pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
754
755    return pages_per_cluster;
756}
757
758static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
759                               unsigned int megs)
760{
761    BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
762
763    return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
764}
765
766static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
767{
768    ext2_set_bit(bit, bitmap);
769}
770#define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
771
772static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
773{
774    ext2_clear_bit(bit, bitmap);
775}
776#define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
777
778#define ocfs2_test_bit ext2_test_bit
779#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
780#define ocfs2_find_next_bit ext2_find_next_bit
781#endif /* OCFS2_H */
782
783

Archive Download this file



interactive