1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * ocfs2.h
4  *
5  * Defines macros and structures used in OCFS2
6  *
7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
8  */
9 
10 #ifndef OCFS2_H
11 #define OCFS2_H
12 
13 #include <linux/spinlock.h>
14 #include <linux/sched.h>
15 #include <linux/wait.h>
16 #include <linux/list.h>
17 #include <linux/llist.h>
18 #include <linux/rbtree.h>
19 #include <linux/workqueue.h>
20 #include <linux/kref.h>
21 #include <linux/mutex.h>
22 #include <linux/lockdep.h>
23 #include <linux/jbd2.h>
24 
25 /* For union ocfs2_dlm_lksb */
26 #include "stackglue.h"
27 
28 #include "ocfs2_fs.h"
29 #include "ocfs2_lockid.h"
30 #include "ocfs2_ioctl.h"
31 
32 /* For struct ocfs2_blockcheck_stats */
33 #include "blockcheck.h"
34 
35 #include "reservations.h"
36 
37 #include "filecheck.h"
38 
39 /* Caching of metadata buffers */
40 
41 /* Most user visible OCFS2 inodes will have very few pieces of
42  * metadata, but larger files (including bitmaps, etc) must be taken
43  * into account when designing an access scheme. We allow a small
44  * amount of inlined blocks to be stored on an array and grow the
45  * structure into a rb tree when necessary. */
46 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
47 
48 /* Flags for ocfs2_caching_info */
49 
50 enum ocfs2_caching_info_flags {
51 	/* Indicates that the metadata cache is using the inline array */
52 	OCFS2_CACHE_FL_INLINE	= 1<<1,
53 };
54 
55 struct ocfs2_caching_operations;
56 struct ocfs2_caching_info {
57 	/*
58 	 * The parent structure provides the locks, but because the
59 	 * parent structure can differ, it provides locking operations
60 	 * to struct ocfs2_caching_info.
61 	 */
62 	const struct ocfs2_caching_operations *ci_ops;
63 
64 	/* next two are protected by trans_inc_lock */
65 	/* which transaction were we created on? Zero if none. */
66 	unsigned long		ci_created_trans;
67 	/* last transaction we were a part of. */
68 	unsigned long		ci_last_trans;
69 
70 	/* Cache structures */
71 	unsigned int		ci_flags;
72 	unsigned int		ci_num_cached;
73 	union {
74 	sector_t	ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
75 		struct rb_root	ci_tree;
76 	} ci_cache;
77 };
78 /*
79  * Need this prototype here instead of in uptodate.h because journal.h
80  * uses it.
81  */
82 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
83 
84 /* this limits us to 256 nodes
85  * if we need more, we can do a kmalloc for the map */
86 #define OCFS2_NODE_MAP_MAX_NODES    256
87 struct ocfs2_node_map {
88 	u16 num_nodes;
89 	unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
90 };
91 
92 enum ocfs2_ast_action {
93 	OCFS2_AST_INVALID = 0,
94 	OCFS2_AST_ATTACH,
95 	OCFS2_AST_CONVERT,
96 	OCFS2_AST_DOWNCONVERT,
97 };
98 
99 /* actions for an unlockast function to take. */
100 enum ocfs2_unlock_action {
101 	OCFS2_UNLOCK_INVALID = 0,
102 	OCFS2_UNLOCK_CANCEL_CONVERT,
103 	OCFS2_UNLOCK_DROP_LOCK,
104 };
105 
106 /* ocfs2_lock_res->l_flags flags. */
107 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* we have initialized
108 					       * the lvb */
109 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
110 					       * dlm_lock */
111 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
112 					       * downconvert*/
113 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
114 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
115 #define OCFS2_LOCK_REFRESHING    (0x00000020)
116 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
117 					       * for shutdown paths */
118 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
119 					       * when to skip queueing
120 					       * a lock because it's
121 					       * about to be
122 					       * dropped. */
123 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
124 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
125 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
126 						 call to dlm_lock.  Only
127 						 exists with BUSY set. */
128 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
129 						     * from downconverting
130 						     * before the upconvert
131 						     * has completed */
132 
133 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
134 						   * lock has already
135 						   * returned, do not block
136 						   * dc thread from
137 						   * downconverting */
138 
139 struct ocfs2_lock_res_ops;
140 
141 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
142 
143 #ifdef CONFIG_OCFS2_FS_STATS
144 struct ocfs2_lock_stats {
145 	u64		ls_total;	/* Total wait in NSEC */
146 	u32		ls_gets;	/* Num acquires */
147 	u32		ls_fail;	/* Num failed acquires */
148 
149 	/* Storing max wait in usecs saves 24 bytes per inode */
150 	u32		ls_max;		/* Max wait in USEC */
151 	u64		ls_last;	/* Last unlock time in USEC */
152 };
153 #endif
154 
155 struct ocfs2_lock_res {
156 	void                    *l_priv;
157 	struct ocfs2_lock_res_ops *l_ops;
158 
159 
160 	struct list_head         l_blocked_list;
161 	struct list_head         l_mask_waiters;
162 	struct list_head	 l_holders;
163 
164 	unsigned long		 l_flags;
165 	char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
166 	unsigned int             l_ro_holders;
167 	unsigned int             l_ex_holders;
168 	signed char		 l_level;
169 	signed char		 l_requested;
170 	signed char		 l_blocking;
171 
172 	/* Data packed - type enum ocfs2_lock_type */
173 	unsigned char            l_type;
174 
175 	/* used from AST/BAST funcs. */
176 	/* Data packed - enum type ocfs2_ast_action */
177 	unsigned char            l_action;
178 	/* Data packed - enum type ocfs2_unlock_action */
179 	unsigned char            l_unlock_action;
180 	unsigned int             l_pending_gen;
181 
182 	spinlock_t               l_lock;
183 
184 	struct ocfs2_dlm_lksb    l_lksb;
185 
186 	wait_queue_head_t        l_event;
187 
188 	struct list_head         l_debug_list;
189 
190 #ifdef CONFIG_OCFS2_FS_STATS
191 	struct ocfs2_lock_stats  l_lock_prmode;		/* PR mode stats */
192 	u32                      l_lock_refresh;	/* Disk refreshes */
193 	u64                      l_lock_wait;	/* First lock wait time */
194 	struct ocfs2_lock_stats  l_lock_exmode;		/* EX mode stats */
195 #endif
196 #ifdef CONFIG_DEBUG_LOCK_ALLOC
197 	struct lockdep_map	 l_lockdep_map;
198 #endif
199 };
200 
201 enum ocfs2_orphan_reco_type {
202 	ORPHAN_NO_NEED_TRUNCATE = 0,
203 	ORPHAN_NEED_TRUNCATE,
204 };
205 
206 enum ocfs2_orphan_scan_state {
207 	ORPHAN_SCAN_ACTIVE,
208 	ORPHAN_SCAN_INACTIVE
209 };
210 
211 struct ocfs2_orphan_scan {
212 	struct mutex 		os_lock;
213 	struct ocfs2_super 	*os_osb;
214 	struct ocfs2_lock_res 	os_lockres;     /* lock to synchronize scans */
215 	struct delayed_work 	os_orphan_scan_work;
216 	time64_t		os_scantime;  /* time this node ran the scan */
217 	u32			os_count;      /* tracks node specific scans */
218 	u32  			os_seqno;       /* tracks cluster wide scans */
219 	atomic_t		os_state;              /* ACTIVE or INACTIVE */
220 };
221 
222 struct ocfs2_dlm_debug {
223 	struct kref d_refcnt;
224 	u32 d_filter_secs;
225 	struct list_head d_lockres_tracking;
226 };
227 
228 enum ocfs2_vol_state
229 {
230 	VOLUME_INIT = 0,
231 	VOLUME_MOUNTED,
232 	VOLUME_MOUNTED_QUOTAS,
233 	VOLUME_DISMOUNTED,
234 	VOLUME_DISABLED
235 };
236 
237 struct ocfs2_alloc_stats
238 {
239 	atomic_t moves;
240 	atomic_t local_data;
241 	atomic_t bitmap_data;
242 	atomic_t bg_allocs;
243 	atomic_t bg_extends;
244 };
245 
246 enum ocfs2_local_alloc_state
247 {
248 	OCFS2_LA_UNUSED = 0,	/* Local alloc will never be used for
249 				 * this mountpoint. */
250 	OCFS2_LA_ENABLED,	/* Local alloc is in use. */
251 	OCFS2_LA_THROTTLED,	/* Local alloc is in use, but number
252 				 * of bits has been reduced. */
253 	OCFS2_LA_DISABLED	/* Local alloc has temporarily been
254 				 * disabled. */
255 };
256 
257 enum ocfs2_mount_options
258 {
259 	OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
260 	OCFS2_MOUNT_BARRIER = 1 << 1,	/* Use block barriers */
261 	OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
262 	OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
263 	OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
264 	OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
265 	OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
266 	OCFS2_MOUNT_INODE64 = 1 << 7,	/* Allow inode numbers > 2^32 */
267 	OCFS2_MOUNT_POSIX_ACL = 1 << 8,	/* Force POSIX access control lists */
268 	OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,	/* Disable POSIX access
269 						   control lists */
270 	OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
271 	OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
272 	OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
273 						     writes */
274 	OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
275 	OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
276 
277 	OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
278 	OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
279 	OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
280 };
281 
282 #define OCFS2_OSB_SOFT_RO	0x0001
283 #define OCFS2_OSB_HARD_RO	0x0002
284 #define OCFS2_OSB_ERROR_FS	0x0004
285 #define OCFS2_DEFAULT_ATIME_QUANTUM	60
286 
287 struct ocfs2_journal;
288 struct ocfs2_slot_info;
289 struct ocfs2_recovery_map;
290 struct ocfs2_replay_map;
291 struct ocfs2_quota_recovery;
292 struct ocfs2_super
293 {
294 	struct task_struct *commit_task;
295 	struct super_block *sb;
296 	struct inode *root_inode;
297 	struct inode *sys_root_inode;
298 	struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
299 	struct inode **local_system_inodes;
300 
301 	struct ocfs2_slot_info *slot_info;
302 
303 	u32 *slot_recovery_generations;
304 
305 	spinlock_t node_map_lock;
306 
307 	u64 root_blkno;
308 	u64 system_dir_blkno;
309 	u64 bitmap_blkno;
310 	u32 bitmap_cpg;
311 	char *uuid_str;
312 	u32 uuid_hash;
313 	u8 *vol_label;
314 	u64 first_cluster_group_blkno;
315 	u32 fs_generation;
316 
317 	u32 s_feature_compat;
318 	u32 s_feature_incompat;
319 	u32 s_feature_ro_compat;
320 
321 	/* Protects s_next_generation, osb_flags and s_inode_steal_slot.
322 	 * Could protect more on osb as it's very short lived.
323 	 */
324 	spinlock_t osb_lock;
325 	u32 s_next_generation;
326 	unsigned long osb_flags;
327 	u16 s_inode_steal_slot;
328 	u16 s_meta_steal_slot;
329 	atomic_t s_num_inodes_stolen;
330 	atomic_t s_num_meta_stolen;
331 
332 	unsigned long s_mount_opt;
333 	unsigned int s_atime_quantum;
334 
335 	unsigned int max_slots;
336 	unsigned int node_num;
337 	int slot_num;
338 	int preferred_slot;
339 	int s_sectsize_bits;
340 	int s_clustersize;
341 	int s_clustersize_bits;
342 	unsigned int s_xattr_inline_size;
343 
344 	atomic_t vol_state;
345 	struct mutex recovery_lock;
346 	struct ocfs2_recovery_map *recovery_map;
347 	struct ocfs2_replay_map *replay_map;
348 	struct task_struct *recovery_thread_task;
349 	int disable_recovery;
350 	wait_queue_head_t checkpoint_event;
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_rwsem 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 two fields are for local node slot recovery during
379 	 * mount. */
380 	struct ocfs2_dinode *local_alloc_copy;
381 	struct ocfs2_quota_recovery *quota_rec;
382 
383 	struct ocfs2_blockcheck_stats osb_ecc_stats;
384 	struct ocfs2_alloc_stats alloc_stats;
385 	char dev_str[20];		/* "major,minor" of the device */
386 
387 	u8 osb_stackflags;
388 
389 	char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
390 	char osb_cluster_name[OCFS2_CLUSTER_NAME_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 rw_semaphore nfs_sync_rwlock;
396 	struct ocfs2_lock_res osb_trim_fs_lockres;
397 	struct mutex obs_trim_fs_mutex;
398 	struct ocfs2_dlm_debug *osb_dlm_debug;
399 
400 	struct dentry *osb_debug_root;
401 
402 	wait_queue_head_t recovery_event;
403 
404 	spinlock_t dc_task_lock;
405 	struct task_struct *dc_task;
406 	wait_queue_head_t dc_event;
407 	unsigned long dc_wake_sequence;
408 	unsigned long dc_work_sequence;
409 
410 	/*
411 	 * Any thread can add locks to the list, but the downconvert
412 	 * thread is the only one allowed to remove locks. Any change
413 	 * to this rule requires updating
414 	 * ocfs2_downconvert_thread_do_work().
415 	 */
416 	struct list_head blocked_lock_list;
417 	unsigned long blocked_lock_count;
418 
419 	/* List of dquot structures to drop last reference to */
420 	struct llist_head dquot_drop_list;
421 	struct work_struct dquot_drop_work;
422 
423 	wait_queue_head_t		osb_mount_event;
424 
425 	/* Truncate log info */
426 	struct inode			*osb_tl_inode;
427 	struct buffer_head		*osb_tl_bh;
428 	struct delayed_work		osb_truncate_log_wq;
429 	atomic_t			osb_tl_disable;
430 	/*
431 	 * How many clusters in our truncate log.
432 	 * It must be protected by osb_tl_inode->i_rwsem.
433 	 */
434 	unsigned int truncated_clusters;
435 
436 	struct ocfs2_node_map		osb_recovering_orphan_dirs;
437 	unsigned int			*osb_orphan_wipes;
438 	wait_queue_head_t		osb_wipe_event;
439 
440 	struct ocfs2_orphan_scan	osb_orphan_scan;
441 
442 	/* used to protect metaecc calculation check of xattr. */
443 	spinlock_t osb_xattr_lock;
444 
445 	unsigned int			osb_dx_mask;
446 	u32				osb_dx_seed[4];
447 
448 	/* the group we used to allocate inodes. */
449 	u64				osb_inode_alloc_group;
450 
451 	/* rb tree root for refcount lock. */
452 	struct rb_root	osb_rf_lock_tree;
453 	struct ocfs2_refcount_tree *osb_ref_tree_lru;
454 
455 	struct mutex system_file_mutex;
456 
457 	/*
458 	 * OCFS2 needs to schedule several different types of work which
459 	 * require cluster locking, disk I/O, recovery waits, etc. Since these
460 	 * types of work tend to be heavy we avoid using the kernel events
461 	 * workqueue and schedule on our own.
462 	 */
463 	struct workqueue_struct *ocfs2_wq;
464 
465 	/* sysfs directory per partition */
466 	struct kset *osb_dev_kset;
467 
468 	/* file check related stuff */
469 	struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
470 };
471 
472 #define OCFS2_SB(sb)	    ((struct ocfs2_super *)(sb)->s_fs_info)
473 
474 /* Useful typedef for passing around journal access functions */
475 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
476 					 struct ocfs2_caching_info *ci,
477 					 struct buffer_head *bh, int type);
478 
ocfs2_should_order_data(struct inode * inode)479 static inline int ocfs2_should_order_data(struct inode *inode)
480 {
481 	if (!S_ISREG(inode->i_mode))
482 		return 0;
483 	if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
484 		return 0;
485 	return 1;
486 }
487 
ocfs2_sparse_alloc(struct ocfs2_super * osb)488 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
489 {
490 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
491 		return 1;
492 	return 0;
493 }
494 
ocfs2_writes_unwritten_extents(struct ocfs2_super * osb)495 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
496 {
497 	/*
498 	 * Support for sparse files is a pre-requisite
499 	 */
500 	if (!ocfs2_sparse_alloc(osb))
501 		return 0;
502 
503 	if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
504 		return 1;
505 	return 0;
506 }
507 
ocfs2_supports_append_dio(struct ocfs2_super * osb)508 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
509 {
510 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
511 		return 1;
512 	return 0;
513 }
514 
515 
ocfs2_supports_inline_data(struct ocfs2_super * osb)516 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
517 {
518 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
519 		return 1;
520 	return 0;
521 }
522 
ocfs2_supports_xattr(struct ocfs2_super * osb)523 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
524 {
525 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
526 		return 1;
527 	return 0;
528 }
529 
ocfs2_meta_ecc(struct ocfs2_super * osb)530 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
531 {
532 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
533 		return 1;
534 	return 0;
535 }
536 
ocfs2_supports_indexed_dirs(struct ocfs2_super * osb)537 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
538 {
539 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
540 		return 1;
541 	return 0;
542 }
543 
ocfs2_supports_discontig_bg(struct ocfs2_super * osb)544 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
545 {
546 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
547 		return 1;
548 	return 0;
549 }
550 
ocfs2_link_max(struct ocfs2_super * osb)551 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
552 {
553 	if (ocfs2_supports_indexed_dirs(osb))
554 		return OCFS2_DX_LINK_MAX;
555 	return OCFS2_LINK_MAX;
556 }
557 
ocfs2_read_links_count(struct ocfs2_dinode * di)558 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
559 {
560 	u32 nlink = le16_to_cpu(di->i_links_count);
561 	u32 hi = le16_to_cpu(di->i_links_count_hi);
562 
563 	if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
564 		nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
565 
566 	return nlink;
567 }
568 
ocfs2_set_links_count(struct ocfs2_dinode * di,u32 nlink)569 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
570 {
571 	u16 lo, hi;
572 
573 	lo = nlink;
574 	hi = nlink >> OCFS2_LINKS_HI_SHIFT;
575 
576 	di->i_links_count = cpu_to_le16(lo);
577 	di->i_links_count_hi = cpu_to_le16(hi);
578 }
579 
ocfs2_add_links_count(struct ocfs2_dinode * di,int n)580 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
581 {
582 	u32 links = ocfs2_read_links_count(di);
583 
584 	links += n;
585 
586 	ocfs2_set_links_count(di, links);
587 }
588 
ocfs2_refcount_tree(struct ocfs2_super * osb)589 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
590 {
591 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
592 		return 1;
593 	return 0;
594 }
595 
596 /* set / clear functions because cluster events can make these happen
597  * in parallel so we want the transitions to be atomic. this also
598  * means that any future flags osb_flags must be protected by spinlock
599  * too! */
ocfs2_set_osb_flag(struct ocfs2_super * osb,unsigned long flag)600 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
601 				      unsigned long flag)
602 {
603 	spin_lock(&osb->osb_lock);
604 	osb->osb_flags |= flag;
605 	spin_unlock(&osb->osb_lock);
606 }
607 
ocfs2_set_ro_flag(struct ocfs2_super * osb,int hard)608 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
609 				     int hard)
610 {
611 	spin_lock(&osb->osb_lock);
612 	osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
613 	if (hard)
614 		osb->osb_flags |= OCFS2_OSB_HARD_RO;
615 	else
616 		osb->osb_flags |= OCFS2_OSB_SOFT_RO;
617 	spin_unlock(&osb->osb_lock);
618 }
619 
ocfs2_is_hard_readonly(struct ocfs2_super * osb)620 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
621 {
622 	int ret;
623 
624 	spin_lock(&osb->osb_lock);
625 	ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
626 	spin_unlock(&osb->osb_lock);
627 
628 	return ret;
629 }
630 
ocfs2_is_soft_readonly(struct ocfs2_super * osb)631 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
632 {
633 	int ret;
634 
635 	spin_lock(&osb->osb_lock);
636 	ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
637 	spin_unlock(&osb->osb_lock);
638 
639 	return ret;
640 }
641 
ocfs2_clusterinfo_valid(struct ocfs2_super * osb)642 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
643 {
644 	return (osb->s_feature_incompat &
645 		(OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
646 		 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
647 }
648 
ocfs2_userspace_stack(struct ocfs2_super * osb)649 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
650 {
651 	if (ocfs2_clusterinfo_valid(osb) &&
652 	    memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
653 		   OCFS2_STACK_LABEL_LEN))
654 		return 1;
655 	return 0;
656 }
657 
ocfs2_o2cb_stack(struct ocfs2_super * osb)658 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
659 {
660 	if (ocfs2_clusterinfo_valid(osb) &&
661 	    !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
662 		   OCFS2_STACK_LABEL_LEN))
663 		return 1;
664 	return 0;
665 }
666 
ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super * osb)667 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
668 {
669 	return ocfs2_o2cb_stack(osb) &&
670 		(osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
671 }
672 
ocfs2_mount_local(struct ocfs2_super * osb)673 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
674 {
675 	return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
676 }
677 
ocfs2_uses_extended_slot_map(struct ocfs2_super * osb)678 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
679 {
680 	return (osb->s_feature_incompat &
681 		OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
682 }
683 
684 
685 #define OCFS2_IS_VALID_DINODE(ptr)					\
686 	(!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
687 
688 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)				\
689 	(!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
690 
691 #define OCFS2_IS_VALID_GROUP_DESC(ptr)					\
692 	(!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
693 
694 
695 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)					\
696 	(!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
697 
698 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)					\
699 	(!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
700 
701 #define OCFS2_IS_VALID_DX_ROOT(ptr)					\
702 	(!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
703 
704 #define OCFS2_IS_VALID_DX_LEAF(ptr)					\
705 	(!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
706 
707 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)				\
708 	(!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
709 
ino_from_blkno(struct super_block * sb,u64 blkno)710 static inline unsigned long ino_from_blkno(struct super_block *sb,
711 					   u64 blkno)
712 {
713 	return (unsigned long)(blkno & (u64)ULONG_MAX);
714 }
715 
ocfs2_clusters_to_blocks(struct super_block * sb,u32 clusters)716 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
717 					   u32 clusters)
718 {
719 	int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
720 		sb->s_blocksize_bits;
721 
722 	return (u64)clusters << c_to_b_bits;
723 }
724 
ocfs2_clusters_for_blocks(struct super_block * sb,u64 blocks)725 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb,
726 		u64 blocks)
727 {
728 	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
729 			sb->s_blocksize_bits;
730 
731 	blocks += (1 << b_to_c_bits) - 1;
732 	return (u32)(blocks >> b_to_c_bits);
733 }
734 
ocfs2_blocks_to_clusters(struct super_block * sb,u64 blocks)735 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
736 					   u64 blocks)
737 {
738 	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
739 		sb->s_blocksize_bits;
740 
741 	return (u32)(blocks >> b_to_c_bits);
742 }
743 
ocfs2_clusters_for_bytes(struct super_block * sb,u64 bytes)744 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
745 						    u64 bytes)
746 {
747 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
748 	unsigned int clusters;
749 
750 	bytes += OCFS2_SB(sb)->s_clustersize - 1;
751 	/* OCFS2 just cannot have enough clusters to overflow this */
752 	clusters = (unsigned int)(bytes >> cl_bits);
753 
754 	return clusters;
755 }
756 
ocfs2_bytes_to_clusters(struct super_block * sb,u64 bytes)757 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
758 		u64 bytes)
759 {
760 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
761 	unsigned int clusters;
762 
763 	clusters = (unsigned int)(bytes >> cl_bits);
764 	return clusters;
765 }
766 
ocfs2_blocks_for_bytes(struct super_block * sb,u64 bytes)767 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
768 					 u64 bytes)
769 {
770 	bytes += sb->s_blocksize - 1;
771 	return bytes >> sb->s_blocksize_bits;
772 }
773 
ocfs2_clusters_to_bytes(struct super_block * sb,u32 clusters)774 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
775 					  u32 clusters)
776 {
777 	return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
778 }
779 
ocfs2_block_to_cluster_start(struct super_block * sb,u64 blocks)780 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
781 					       u64 blocks)
782 {
783 	int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
784 	unsigned int clusters;
785 
786 	clusters = ocfs2_blocks_to_clusters(sb, blocks);
787 	return (u64)clusters << bits;
788 }
789 
ocfs2_align_bytes_to_clusters(struct super_block * sb,u64 bytes)790 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
791 						u64 bytes)
792 {
793 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
794 	unsigned int clusters;
795 
796 	clusters = ocfs2_clusters_for_bytes(sb, bytes);
797 	return (u64)clusters << cl_bits;
798 }
799 
ocfs2_align_bytes_to_blocks(struct super_block * sb,u64 bytes)800 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
801 					      u64 bytes)
802 {
803 	u64 blocks;
804 
805         blocks = ocfs2_blocks_for_bytes(sb, bytes);
806 	return blocks << sb->s_blocksize_bits;
807 }
808 
ocfs2_align_bytes_to_sectors(u64 bytes)809 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
810 {
811 	return (unsigned long)((bytes + 511) >> 9);
812 }
813 
ocfs2_page_index_to_clusters(struct super_block * sb,unsigned long pg_index)814 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
815 							unsigned long pg_index)
816 {
817 	u32 clusters = pg_index;
818 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
819 
820 	if (unlikely(PAGE_SHIFT > cbits))
821 		clusters = pg_index << (PAGE_SHIFT - cbits);
822 	else if (PAGE_SHIFT < cbits)
823 		clusters = pg_index >> (cbits - PAGE_SHIFT);
824 
825 	return clusters;
826 }
827 
828 /*
829  * Find the 1st page index which covers the given clusters.
830  */
ocfs2_align_clusters_to_page_index(struct super_block * sb,u32 clusters)831 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
832 							u32 clusters)
833 {
834 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
835         pgoff_t index = clusters;
836 
837 	if (PAGE_SHIFT > cbits) {
838 		index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
839 	} else if (PAGE_SHIFT < cbits) {
840 		index = (pgoff_t)clusters << (cbits - PAGE_SHIFT);
841 	}
842 
843 	return index;
844 }
845 
ocfs2_pages_per_cluster(struct super_block * sb)846 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
847 {
848 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
849 	unsigned int pages_per_cluster = 1;
850 
851 	if (PAGE_SHIFT < cbits)
852 		pages_per_cluster = 1 << (cbits - PAGE_SHIFT);
853 
854 	return pages_per_cluster;
855 }
856 
ocfs2_megabytes_to_clusters(struct super_block * sb,unsigned int megs)857 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
858 						       unsigned int megs)
859 {
860 	BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
861 
862 	return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
863 }
864 
ocfs2_clusters_to_megabytes(struct super_block * sb,unsigned int clusters)865 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
866 						       unsigned int clusters)
867 {
868 	return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
869 }
870 
_ocfs2_set_bit(unsigned int bit,unsigned long * bitmap)871 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
872 {
873 	__set_bit_le(bit, bitmap);
874 }
875 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
876 
_ocfs2_clear_bit(unsigned int bit,unsigned long * bitmap)877 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
878 {
879 	__clear_bit_le(bit, bitmap);
880 }
881 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
882 
883 #define ocfs2_test_bit test_bit_le
884 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
885 #define ocfs2_find_next_bit find_next_bit_le
886 
correct_addr_and_bit_unaligned(int * bit,void * addr)887 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
888 {
889 #if BITS_PER_LONG == 64
890 	*bit += ((unsigned long) addr & 7UL) << 3;
891 	addr = (void *) ((unsigned long) addr & ~7UL);
892 #elif BITS_PER_LONG == 32
893 	*bit += ((unsigned long) addr & 3UL) << 3;
894 	addr = (void *) ((unsigned long) addr & ~3UL);
895 #else
896 #error "how many bits you are?!"
897 #endif
898 	return addr;
899 }
900 
ocfs2_set_bit_unaligned(int bit,void * bitmap)901 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
902 {
903 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
904 	ocfs2_set_bit(bit, bitmap);
905 }
906 
ocfs2_clear_bit_unaligned(int bit,void * bitmap)907 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
908 {
909 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
910 	ocfs2_clear_bit(bit, bitmap);
911 }
912 
ocfs2_test_bit_unaligned(int bit,void * bitmap)913 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
914 {
915 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
916 	return ocfs2_test_bit(bit, bitmap);
917 }
918 
ocfs2_find_next_zero_bit_unaligned(void * bitmap,int max,int start)919 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
920 							int start)
921 {
922 	int fix = 0, ret, tmpmax;
923 	bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
924 	tmpmax = max + fix;
925 	start += fix;
926 
927 	ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
928 	if (ret > max)
929 		return max;
930 	return ret;
931 }
932 
933 #endif  /* OCFS2_H */
934 
935