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 
63 enum ocfs2_caching_info_flags {
64 	/* Indicates that the metadata cache is using the inline array */
65 	OCFS2_CACHE_FL_INLINE	= 1<<1,
66 };
67 
68 struct ocfs2_caching_operations;
69 struct 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  */
95 struct 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
100 struct ocfs2_node_map {
101 	u16 num_nodes;
102 	unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
103 };
104 
105 enum 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. */
113 enum 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 
146 struct ocfs2_lock_res_ops;
147 
148 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
149 
150 #ifdef CONFIG_OCFS2_FS_STATS
151 struct 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 
161 struct 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 
205 enum ocfs2_orphan_scan_state {
206 	ORPHAN_SCAN_ACTIVE,
207 	ORPHAN_SCAN_INACTIVE
208 };
209 
210 struct 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 
221 struct ocfs2_dlm_debug {
222 	struct kref d_refcnt;
223 	struct dentry *d_locking_state;
224 	struct list_head d_lockres_tracking;
225 };
226 
227 enum ocfs2_vol_state
228 {
229 	VOLUME_INIT = 0,
230 	VOLUME_MOUNTED,
231 	VOLUME_MOUNTED_QUOTAS,
232 	VOLUME_DISMOUNTED,
233 	VOLUME_DISABLED
234 };
235 
236 struct 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 
245 enum 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 
256 enum 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 
284 struct ocfs2_journal;
285 struct ocfs2_slot_info;
286 struct ocfs2_recovery_map;
287 struct ocfs2_replay_map;
288 struct ocfs2_quota_recovery;
289 struct ocfs2_dentry_lock;
290 struct 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 */
457 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
458 					 struct ocfs2_caching_info *ci,
459 					 struct buffer_head *bh, int type);
460 
ocfs2_should_order_data(struct inode * inode)461 static 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 
ocfs2_sparse_alloc(struct ocfs2_super * osb)470 static 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 
ocfs2_writes_unwritten_extents(struct ocfs2_super * osb)477 static 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 
ocfs2_supports_inline_data(struct ocfs2_super * osb)490 static 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 
ocfs2_supports_xattr(struct ocfs2_super * osb)497 static 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 
ocfs2_meta_ecc(struct ocfs2_super * osb)504 static 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 
ocfs2_supports_indexed_dirs(struct ocfs2_super * osb)511 static 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 
ocfs2_supports_discontig_bg(struct ocfs2_super * osb)518 static 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 
ocfs2_link_max(struct ocfs2_super * osb)525 static 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 
ocfs2_read_links_count(struct ocfs2_dinode * di)532 static 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 
ocfs2_set_links_count(struct ocfs2_dinode * di,u32 nlink)543 static 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 
ocfs2_add_links_count(struct ocfs2_dinode * di,int n)554 static 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 
ocfs2_refcount_tree(struct ocfs2_super * osb)563 static 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! */
ocfs2_set_osb_flag(struct ocfs2_super * osb,unsigned long flag)574 static 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 
ocfs2_test_osb_flag(struct ocfs2_super * osb,unsigned long flag)583 static 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 
ocfs2_set_ro_flag(struct ocfs2_super * osb,int hard)594 static 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 
ocfs2_is_hard_readonly(struct ocfs2_super * osb)606 static 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 
ocfs2_is_soft_readonly(struct ocfs2_super * osb)617 static 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 
ocfs2_clusterinfo_valid(struct ocfs2_super * osb)628 static 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 
ocfs2_userspace_stack(struct ocfs2_super * osb)635 static 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 
ocfs2_o2cb_stack(struct ocfs2_super * osb)644 static 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 
ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super * osb)653 static 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 
ocfs2_mount_local(struct ocfs2_super * osb)659 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
660 {
661 	return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
662 }
663 
ocfs2_uses_extended_slot_map(struct ocfs2_super * osb)664 static 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 
ino_from_blkno(struct super_block * sb,u64 blkno)696 static inline unsigned long ino_from_blkno(struct super_block *sb,
697 					   u64 blkno)
698 {
699 	return (unsigned long)(blkno & (u64)ULONG_MAX);
700 }
701 
ocfs2_clusters_to_blocks(struct super_block * sb,u32 clusters)702 static 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 
ocfs2_blocks_to_clusters(struct super_block * sb,u64 blocks)711 static 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 
ocfs2_clusters_for_bytes(struct super_block * sb,u64 bytes)720 static 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 
ocfs2_blocks_for_bytes(struct super_block * sb,u64 bytes)733 static 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 
ocfs2_clusters_to_bytes(struct super_block * sb,u32 clusters)740 static 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 
ocfs2_block_to_cluster_start(struct super_block * sb,u64 blocks)746 static 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 
ocfs2_align_bytes_to_clusters(struct super_block * sb,u64 bytes)756 static 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 
ocfs2_align_bytes_to_blocks(struct super_block * sb,u64 bytes)766 static 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 
ocfs2_align_bytes_to_sectors(u64 bytes)775 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
776 {
777 	return (unsigned long)((bytes + 511) >> 9);
778 }
779 
ocfs2_page_index_to_clusters(struct super_block * sb,unsigned long pg_index)780 static 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  */
ocfs2_align_clusters_to_page_index(struct super_block * sb,u32 clusters)797 static 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 
ocfs2_pages_per_cluster(struct super_block * sb)812 static 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 
ocfs2_megabytes_to_clusters(struct super_block * sb,unsigned int megs)823 static 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 
ocfs2_clusters_to_megabytes(struct super_block * sb,unsigned int clusters)831 static 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 
_ocfs2_set_bit(unsigned int bit,unsigned long * bitmap)837 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
838 {
839 	__set_bit_le(bit, bitmap);
840 }
841 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
842 
_ocfs2_clear_bit(unsigned int bit,unsigned long * bitmap)843 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
844 {
845 	__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 
correct_addr_and_bit_unaligned(int * bit,void * addr)853 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
854 {
855 #if BITS_PER_LONG == 64
856 	*bit += ((unsigned long) addr & 7UL) << 3;
857 	addr = (void *) ((unsigned long) addr & ~7UL);
858 #elif BITS_PER_LONG == 32
859 	*bit += ((unsigned long) addr & 3UL) << 3;
860 	addr = (void *) ((unsigned long) addr & ~3UL);
861 #else
862 #error "how many bits you are?!"
863 #endif
864 	return addr;
865 }
866 
ocfs2_set_bit_unaligned(int bit,void * bitmap)867 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
868 {
869 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
870 	ocfs2_set_bit(bit, bitmap);
871 }
872 
ocfs2_clear_bit_unaligned(int bit,void * bitmap)873 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
874 {
875 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
876 	ocfs2_clear_bit(bit, bitmap);
877 }
878 
ocfs2_test_bit_unaligned(int bit,void * bitmap)879 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
880 {
881 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
882 	return ocfs2_test_bit(bit, bitmap);
883 }
884 
ocfs2_find_next_zero_bit_unaligned(void * bitmap,int max,int start)885 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
886 							int start)
887 {
888 	int fix = 0, ret, tmpmax;
889 	bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
890 	tmpmax = max + fix;
891 	start += fix;
892 
893 	ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
894 	if (ret > max)
895 		return max;
896 	return ret;
897 }
898 
899 #endif  /* OCFS2_H */
900 
901