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#include "reservations.h"
51
52/* Caching of metadata buffers */
53
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
60
61/* Flags for ocfs2_caching_info */
62
63enum ocfs2_caching_info_flags {
64    /* Indicates that the metadata cache is using the inline array */
65    OCFS2_CACHE_FL_INLINE = 1<<1,
66};
67
68struct ocfs2_caching_operations;
69struct ocfs2_caching_info {
70    /*
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.
74     */
75    const struct ocfs2_caching_operations *ci_ops;
76
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;
82
83    /* Cache structures */
84    unsigned int ci_flags;
85    unsigned int ci_num_cached;
86    union {
87    sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
88        struct rb_root ci_tree;
89    } ci_cache;
90};
91/*
92 * Need this prototype here instead of in uptodate.h because journal.h
93 * uses it.
94 */
95struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
96
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
100struct ocfs2_node_map {
101    u16 num_nodes;
102    unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
103};
104
105enum ocfs2_ast_action {
106    OCFS2_AST_INVALID = 0,
107    OCFS2_AST_ATTACH,
108    OCFS2_AST_CONVERT,
109    OCFS2_AST_DOWNCONVERT,
110};
111
112/* actions for an unlockast function to take. */
113enum ocfs2_unlock_action {
114    OCFS2_UNLOCK_INVALID = 0,
115    OCFS2_UNLOCK_CANCEL_CONVERT,
116    OCFS2_UNLOCK_DROP_LOCK,
117};
118
119/* ocfs2_lock_res->l_flags flags. */
120#define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
121                           * the lvb */
122#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
123                           * dlm_lock */
124#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
125                           * downconvert*/
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
134                           * about to be
135                           * dropped. */
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
144                             * has completed */
145
146struct ocfs2_lock_res_ops;
147
148typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
149
150#ifdef CONFIG_OCFS2_FS_STATS
151struct ocfs2_lock_stats {
152    u64 ls_total; /* Total wait in NSEC */
153    u32 ls_gets; /* Num acquires */
154    u32 ls_fail; /* Num failed acquires */
155
156    /* Storing max wait in usecs saves 24 bytes per inode */
157    u32 ls_max; /* Max wait in USEC */
158};
159#endif
160
161struct ocfs2_lock_res {
162    void *l_priv;
163    struct ocfs2_lock_res_ops *l_ops;
164
165
166    struct list_head l_blocked_list;
167    struct list_head l_mask_waiters;
168
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;
173    signed char l_level;
174    signed char l_requested;
175    signed char l_blocking;
176
177    /* Data packed - type enum ocfs2_lock_type */
178    unsigned char l_type;
179
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;
186
187    spinlock_t l_lock;
188
189    struct ocfs2_dlm_lksb l_lksb;
190
191    wait_queue_head_t l_event;
192
193    struct list_head l_debug_list;
194
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 */
199#endif
200#ifdef CONFIG_DEBUG_LOCK_ALLOC
201    struct lockdep_map l_lockdep_map;
202#endif
203};
204
205enum ocfs2_orphan_scan_state {
206    ORPHAN_SCAN_ACTIVE,
207    ORPHAN_SCAN_INACTIVE
208};
209
210struct 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 */
219};
220
221struct ocfs2_dlm_debug {
222    struct kref d_refcnt;
223    struct dentry *d_locking_state;
224    struct list_head d_lockres_tracking;
225};
226
227enum ocfs2_vol_state
228{
229    VOLUME_INIT = 0,
230    VOLUME_MOUNTED,
231    VOLUME_MOUNTED_QUOTAS,
232    VOLUME_DISMOUNTED,
233    VOLUME_DISABLED
234};
235
236struct ocfs2_alloc_stats
237{
238    atomic_t moves;
239    atomic_t local_data;
240    atomic_t bitmap_data;
241    atomic_t bg_allocs;
242    atomic_t bg_extends;
243};
244
245enum ocfs2_local_alloc_state
246{
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
253                 * disabled. */
254};
255
256enum ocfs2_mount_options
257{
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
268                           control lists */
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
272                             writes */
273    OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
274    OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
275};
276
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
281
282#define OCFS2_DEFAULT_ATIME_QUANTUM 60
283
284struct ocfs2_journal;
285struct ocfs2_slot_info;
286struct ocfs2_recovery_map;
287struct ocfs2_replay_map;
288struct ocfs2_quota_recovery;
289struct ocfs2_dentry_lock;
290struct ocfs2_super
291{
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;
298
299    struct ocfs2_slot_info *slot_info;
300
301    u32 *slot_recovery_generations;
302
303    spinlock_t node_map_lock;
304
305    u64 root_blkno;
306    u64 system_dir_blkno;
307    u64 bitmap_blkno;
308    u32 bitmap_cpg;
309    u8 *uuid;
310    char *uuid_str;
311    u32 uuid_hash;
312    u8 *vol_label;
313    u64 first_cluster_group_blkno;
314    u32 fs_generation;
315
316    u32 s_feature_compat;
317    u32 s_feature_incompat;
318    u32 s_feature_ro_compat;
319
320    /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
321     * Could protect more on osb as it's very short lived.
322     */
323    spinlock_t osb_lock;
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;
330
331    unsigned long s_mount_opt;
332    unsigned int s_atime_quantum;
333
334    unsigned int max_slots;
335    unsigned int node_num;
336    int slot_num;
337    int preferred_slot;
338    int s_sectsize_bits;
339    int s_clustersize;
340    int s_clustersize_bits;
341    unsigned int s_xattr_inline_size;
342
343    atomic_t vol_state;
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;
353
354    struct delayed_work la_enable_wq;
355
356    /*
357     * Must hold local alloc i_mutex and osb->osb_lock to change
358     * local_alloc_bits. Reads can be done under either lock.
359     */
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
363     * be up to date. */
364    unsigned int osb_clusters_at_boot;
365
366    enum ocfs2_local_alloc_state local_alloc_state; /* protected
367                             * by osb_lock */
368
369    struct buffer_head *local_alloc_bh;
370
371    u64 la_last_gd;
372
373    struct ocfs2_reservation_map osb_la_resmap;
374
375    unsigned int osb_resv_level;
376    unsigned int osb_dir_resv_level;
377
378    /* Next three fields are for local node slot recovery during
379     * mount. */
380    int dirty;
381    struct ocfs2_dinode *local_alloc_copy;
382    struct ocfs2_quota_recovery *quota_rec;
383
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 */
387
388    u8 osb_stackflags;
389
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;
396
397    struct dentry *osb_debug_root;
398    struct dentry *osb_ctxt;
399
400    wait_queue_head_t recovery_event;
401
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;
407
408    /*
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().
413     */
414    struct list_head blocked_lock_list;
415    unsigned long blocked_lock_count;
416
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;
421
422    wait_queue_head_t osb_mount_event;
423
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;
428    /*
429     * How many clusters in our truncate log.
430     * It must be protected by osb_tl_inode->i_mutex.
431     */
432    unsigned int truncated_clusters;
433
434    struct ocfs2_node_map osb_recovering_orphan_dirs;
435    unsigned int *osb_orphan_wipes;
436    wait_queue_head_t osb_wipe_event;
437
438    struct ocfs2_orphan_scan osb_orphan_scan;
439
440    /* used to protect metaecc calculation check of xattr. */
441    spinlock_t osb_xattr_lock;
442
443    unsigned int osb_dx_mask;
444    u32 osb_dx_seed[4];
445
446    /* the group we used to allocate inodes. */
447    u64 osb_inode_alloc_group;
448
449    /* rb tree root for refcount lock. */
450    struct rb_root osb_rf_lock_tree;
451    struct ocfs2_refcount_tree *osb_ref_tree_lru;
452};
453
454#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
455
456/* Useful typedef for passing around journal access functions */
457typedef int (*ocfs2_journal_access_func)(handle_t *handle,
458                     struct ocfs2_caching_info *ci,
459                     struct buffer_head *bh, int type);
460
461static inline int ocfs2_should_order_data(struct inode *inode)
462{
463    if (!S_ISREG(inode->i_mode))
464        return 0;
465    if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
466        return 0;
467    return 1;
468}
469
470static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
471{
472    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
473        return 1;
474    return 0;
475}
476
477static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
478{
479    /*
480     * Support for sparse files is a pre-requisite
481     */
482    if (!ocfs2_sparse_alloc(osb))
483        return 0;
484
485    if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
486        return 1;
487    return 0;
488}
489
490static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
491{
492    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
493        return 1;
494    return 0;
495}
496
497static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
498{
499    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
500        return 1;
501    return 0;
502}
503
504static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
505{
506    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
507        return 1;
508    return 0;
509}
510
511static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
512{
513    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
514        return 1;
515    return 0;
516}
517
518static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
519{
520    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
521        return 1;
522    return 0;
523}
524
525static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
526{
527    if (ocfs2_supports_indexed_dirs(osb))
528        return OCFS2_DX_LINK_MAX;
529    return OCFS2_LINK_MAX;
530}
531
532static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
533{
534    u32 nlink = le16_to_cpu(di->i_links_count);
535    u32 hi = le16_to_cpu(di->i_links_count_hi);
536
537    if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
538        nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
539
540    return nlink;
541}
542
543static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
544{
545    u16 lo, hi;
546
547    lo = nlink;
548    hi = nlink >> OCFS2_LINKS_HI_SHIFT;
549
550    di->i_links_count = cpu_to_le16(lo);
551    di->i_links_count_hi = cpu_to_le16(hi);
552}
553
554static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
555{
556    u32 links = ocfs2_read_links_count(di);
557
558    links += n;
559
560    ocfs2_set_links_count(di, links);
561}
562
563static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
564{
565    if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
566        return 1;
567    return 0;
568}
569
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
573 * too! */
574static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
575                      unsigned long flag)
576{
577    spin_lock(&osb->osb_lock);
578    osb->osb_flags |= flag;
579    spin_unlock(&osb->osb_lock);
580}
581
582
583static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
584                         unsigned long flag)
585{
586    unsigned long ret;
587
588    spin_lock(&osb->osb_lock);
589    ret = osb->osb_flags & flag;
590    spin_unlock(&osb->osb_lock);
591    return ret;
592}
593
594static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
595                     int hard)
596{
597    spin_lock(&osb->osb_lock);
598    osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
599    if (hard)
600        osb->osb_flags |= OCFS2_OSB_HARD_RO;
601    else
602        osb->osb_flags |= OCFS2_OSB_SOFT_RO;
603    spin_unlock(&osb->osb_lock);
604}
605
606static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
607{
608    int ret;
609
610    spin_lock(&osb->osb_lock);
611    ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
612    spin_unlock(&osb->osb_lock);
613
614    return ret;
615}
616
617static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
618{
619    int ret;
620
621    spin_lock(&osb->osb_lock);
622    ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
623    spin_unlock(&osb->osb_lock);
624
625    return ret;
626}
627
628static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
629{
630    return (osb->s_feature_incompat &
631        (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
632         OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
633}
634
635static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
636{
637    if (ocfs2_clusterinfo_valid(osb) &&
638        memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
639           OCFS2_STACK_LABEL_LEN))
640        return 1;
641    return 0;
642}
643
644static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
645{
646    if (ocfs2_clusterinfo_valid(osb) &&
647        !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
648           OCFS2_STACK_LABEL_LEN))
649        return 1;
650    return 0;
651}
652
653static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
654{
655    return ocfs2_o2cb_stack(osb) &&
656        (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
657}
658
659static inline int ocfs2_mount_local(struct ocfs2_super *osb)
660{
661    return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
662}
663
664static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
665{
666    return (osb->s_feature_incompat &
667        OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
668}
669
670
671#define OCFS2_IS_VALID_DINODE(ptr) \
672    (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
673
674#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
675    (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
676
677#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
678    (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
679
680
681#define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
682    (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
683
684#define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
685    (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
686
687#define OCFS2_IS_VALID_DX_ROOT(ptr) \
688    (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
689
690#define OCFS2_IS_VALID_DX_LEAF(ptr) \
691    (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
692
693#define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \
694    (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
695
696static inline unsigned long ino_from_blkno(struct super_block *sb,
697                       u64 blkno)
698{
699    return (unsigned long)(blkno & (u64)ULONG_MAX);
700}
701
702static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
703                       u32 clusters)
704{
705    int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
706        sb->s_blocksize_bits;
707
708    return (u64)clusters << c_to_b_bits;
709}
710
711static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
712                       u64 blocks)
713{
714    int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
715        sb->s_blocksize_bits;
716
717    return (u32)(blocks >> b_to_c_bits);
718}
719
720static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
721                            u64 bytes)
722{
723    int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
724    unsigned int clusters;
725
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);
729
730    return clusters;
731}
732
733static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
734                     u64 bytes)
735{
736    bytes += sb->s_blocksize - 1;
737    return bytes >> sb->s_blocksize_bits;
738}
739
740static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
741                      u32 clusters)
742{
743    return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
744}
745
746static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
747                           u64 blocks)
748{
749    int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
750    unsigned int clusters;
751
752    clusters = ocfs2_blocks_to_clusters(sb, blocks);
753    return (u64)clusters << bits;
754}
755
756static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
757                        u64 bytes)
758{
759    int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
760    unsigned int clusters;
761
762    clusters = ocfs2_clusters_for_bytes(sb, bytes);
763    return (u64)clusters << cl_bits;
764}
765
766static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
767                          u64 bytes)
768{
769    u64 blocks;
770
771        blocks = ocfs2_blocks_for_bytes(sb, bytes);
772    return blocks << sb->s_blocksize_bits;
773}
774
775static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
776{
777    return (unsigned long)((bytes + 511) >> 9);
778}
779
780static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
781                            unsigned long pg_index)
782{
783    u32 clusters = pg_index;
784    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
785
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);
790
791    return clusters;
792}
793
794/*
795 * Find the 1st page index which covers the given clusters.
796 */
797static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
798                            u32 clusters)
799{
800    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
801        pgoff_t index = clusters;
802
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);
807    }
808
809    return index;
810}
811
812static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
813{
814    unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
815    unsigned int pages_per_cluster = 1;
816
817    if (PAGE_CACHE_SHIFT < cbits)
818        pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
819
820    return pages_per_cluster;
821}
822
823static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
824                               unsigned int megs)
825{
826    BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
827
828    return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
829}
830
831static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
832                               unsigned int clusters)
833{
834    return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
835}
836
837static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
838{
839    __test_and_set_bit_le(bit, bitmap);
840}
841#define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
842
843static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
844{
845    __test_and_clear_bit_le(bit, bitmap);
846}
847#define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
848
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
852#endif /* OCFS2_H */
853
854

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