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/llist.h>
34 #include <linux/rbtree.h>
35 #include <linux/workqueue.h>
36 #include <linux/kref.h>
37 #include <linux/mutex.h>
38 #include <linux/lockdep.h>
39 #include <linux/jbd2.h>
40 
41 /* For union ocfs2_dlm_lksb */
42 #include "stackglue.h"
43 
44 #include "ocfs2_fs.h"
45 #include "ocfs2_lockid.h"
46 #include "ocfs2_ioctl.h"
47 
48 /* For struct ocfs2_blockcheck_stats */
49 #include "blockcheck.h"
50 
51 #include "reservations.h"
52 
53 #include "filecheck.h"
54 
55 /* Caching of metadata buffers */
56 
57 /* Most user visible OCFS2 inodes will have very few pieces of
58  * metadata, but larger files (including bitmaps, etc) must be taken
59  * into account when designing an access scheme. We allow a small
60  * amount of inlined blocks to be stored on an array and grow the
61  * structure into a rb tree when necessary. */
62 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
63 
64 /* Flags for ocfs2_caching_info */
65 
66 enum ocfs2_caching_info_flags {
67 	/* Indicates that the metadata cache is using the inline array */
68 	OCFS2_CACHE_FL_INLINE	= 1<<1,
69 };
70 
71 struct ocfs2_caching_operations;
72 struct ocfs2_caching_info {
73 	/*
74 	 * The parent structure provides the locks, but because the
75 	 * parent structure can differ, it provides locking operations
76 	 * to struct ocfs2_caching_info.
77 	 */
78 	const struct ocfs2_caching_operations *ci_ops;
79 
80 	/* next two are protected by trans_inc_lock */
81 	/* which transaction were we created on? Zero if none. */
82 	unsigned long		ci_created_trans;
83 	/* last transaction we were a part of. */
84 	unsigned long		ci_last_trans;
85 
86 	/* Cache structures */
87 	unsigned int		ci_flags;
88 	unsigned int		ci_num_cached;
89 	union {
90 	sector_t	ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
91 		struct rb_root	ci_tree;
92 	} ci_cache;
93 };
94 /*
95  * Need this prototype here instead of in uptodate.h because journal.h
96  * uses it.
97  */
98 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
99 
100 /* this limits us to 256 nodes
101  * if we need more, we can do a kmalloc for the map */
102 #define OCFS2_NODE_MAP_MAX_NODES    256
103 struct ocfs2_node_map {
104 	u16 num_nodes;
105 	unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
106 };
107 
108 enum ocfs2_ast_action {
109 	OCFS2_AST_INVALID = 0,
110 	OCFS2_AST_ATTACH,
111 	OCFS2_AST_CONVERT,
112 	OCFS2_AST_DOWNCONVERT,
113 };
114 
115 /* actions for an unlockast function to take. */
116 enum ocfs2_unlock_action {
117 	OCFS2_UNLOCK_INVALID = 0,
118 	OCFS2_UNLOCK_CANCEL_CONVERT,
119 	OCFS2_UNLOCK_DROP_LOCK,
120 };
121 
122 /* ocfs2_lock_res->l_flags flags. */
123 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* we have initialized
124 					       * the lvb */
125 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
126 					       * dlm_lock */
127 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
128 					       * downconvert*/
129 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
130 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
131 #define OCFS2_LOCK_REFRESHING    (0x00000020)
132 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
133 					       * for shutdown paths */
134 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
135 					       * when to skip queueing
136 					       * a lock because it's
137 					       * about to be
138 					       * dropped. */
139 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
140 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
141 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
142 						 call to dlm_lock.  Only
143 						 exists with BUSY set. */
144 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
145 						     * from downconverting
146 						     * before the upconvert
147 						     * has completed */
148 
149 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
150 						   * lock has already
151 						   * returned, do not block
152 						   * dc thread from
153 						   * downconverting */
154 
155 struct ocfs2_lock_res_ops;
156 
157 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
158 
159 #ifdef CONFIG_OCFS2_FS_STATS
160 struct ocfs2_lock_stats {
161 	u64		ls_total;	/* Total wait in NSEC */
162 	u32		ls_gets;	/* Num acquires */
163 	u32		ls_fail;	/* Num failed acquires */
164 
165 	/* Storing max wait in usecs saves 24 bytes per inode */
166 	u32		ls_max;		/* Max wait in USEC */
167 };
168 #endif
169 
170 struct ocfs2_lock_res {
171 	void                    *l_priv;
172 	struct ocfs2_lock_res_ops *l_ops;
173 
174 
175 	struct list_head         l_blocked_list;
176 	struct list_head         l_mask_waiters;
177 	struct list_head	 l_holders;
178 
179 	unsigned long		 l_flags;
180 	char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
181 	unsigned int             l_ro_holders;
182 	unsigned int             l_ex_holders;
183 	signed char		 l_level;
184 	signed char		 l_requested;
185 	signed char		 l_blocking;
186 
187 	/* Data packed - type enum ocfs2_lock_type */
188 	unsigned char            l_type;
189 
190 	/* used from AST/BAST funcs. */
191 	/* Data packed - enum type ocfs2_ast_action */
192 	unsigned char            l_action;
193 	/* Data packed - enum type ocfs2_unlock_action */
194 	unsigned char            l_unlock_action;
195 	unsigned int             l_pending_gen;
196 
197 	spinlock_t               l_lock;
198 
199 	struct ocfs2_dlm_lksb    l_lksb;
200 
201 	wait_queue_head_t        l_event;
202 
203 	struct list_head         l_debug_list;
204 
205 #ifdef CONFIG_OCFS2_FS_STATS
206 	struct ocfs2_lock_stats  l_lock_prmode;		/* PR mode stats */
207 	u32                      l_lock_refresh;	/* Disk refreshes */
208 	struct ocfs2_lock_stats  l_lock_exmode;		/* EX mode stats */
209 #endif
210 #ifdef CONFIG_DEBUG_LOCK_ALLOC
211 	struct lockdep_map	 l_lockdep_map;
212 #endif
213 };
214 
215 enum ocfs2_orphan_reco_type {
216 	ORPHAN_NO_NEED_TRUNCATE = 0,
217 	ORPHAN_NEED_TRUNCATE,
218 };
219 
220 enum ocfs2_orphan_scan_state {
221 	ORPHAN_SCAN_ACTIVE,
222 	ORPHAN_SCAN_INACTIVE
223 };
224 
225 struct ocfs2_orphan_scan {
226 	struct mutex 		os_lock;
227 	struct ocfs2_super 	*os_osb;
228 	struct ocfs2_lock_res 	os_lockres;     /* lock to synchronize scans */
229 	struct delayed_work 	os_orphan_scan_work;
230 	time64_t		os_scantime;  /* time this node ran the scan */
231 	u32			os_count;      /* tracks node specific scans */
232 	u32  			os_seqno;       /* tracks cluster wide scans */
233 	atomic_t		os_state;              /* ACTIVE or INACTIVE */
234 };
235 
236 struct ocfs2_dlm_debug {
237 	struct kref d_refcnt;
238 	struct dentry *d_locking_state;
239 	struct list_head d_lockres_tracking;
240 };
241 
242 enum ocfs2_vol_state
243 {
244 	VOLUME_INIT = 0,
245 	VOLUME_MOUNTED,
246 	VOLUME_MOUNTED_QUOTAS,
247 	VOLUME_DISMOUNTED,
248 	VOLUME_DISABLED
249 };
250 
251 struct ocfs2_alloc_stats
252 {
253 	atomic_t moves;
254 	atomic_t local_data;
255 	atomic_t bitmap_data;
256 	atomic_t bg_allocs;
257 	atomic_t bg_extends;
258 };
259 
260 enum ocfs2_local_alloc_state
261 {
262 	OCFS2_LA_UNUSED = 0,	/* Local alloc will never be used for
263 				 * this mountpoint. */
264 	OCFS2_LA_ENABLED,	/* Local alloc is in use. */
265 	OCFS2_LA_THROTTLED,	/* Local alloc is in use, but number
266 				 * of bits has been reduced. */
267 	OCFS2_LA_DISABLED	/* Local alloc has temporarily been
268 				 * disabled. */
269 };
270 
271 enum ocfs2_mount_options
272 {
273 	OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
274 	OCFS2_MOUNT_BARRIER = 1 << 1,	/* Use block barriers */
275 	OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
276 	OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
277 	OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
278 	OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
279 	OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
280 	OCFS2_MOUNT_INODE64 = 1 << 7,	/* Allow inode numbers > 2^32 */
281 	OCFS2_MOUNT_POSIX_ACL = 1 << 8,	/* Force POSIX access control lists */
282 	OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,	/* Disable POSIX access
283 						   control lists */
284 	OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
285 	OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
286 	OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
287 						     writes */
288 	OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
289 	OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
290 
291 	OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
292 	OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
293 	OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
294 };
295 
296 #define OCFS2_OSB_SOFT_RO	0x0001
297 #define OCFS2_OSB_HARD_RO	0x0002
298 #define OCFS2_OSB_ERROR_FS	0x0004
299 #define OCFS2_DEFAULT_ATIME_QUANTUM	60
300 
301 struct ocfs2_journal;
302 struct ocfs2_slot_info;
303 struct ocfs2_recovery_map;
304 struct ocfs2_replay_map;
305 struct ocfs2_quota_recovery;
306 struct ocfs2_super
307 {
308 	struct task_struct *commit_task;
309 	struct super_block *sb;
310 	struct inode *root_inode;
311 	struct inode *sys_root_inode;
312 	struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
313 	struct inode **local_system_inodes;
314 
315 	struct ocfs2_slot_info *slot_info;
316 
317 	u32 *slot_recovery_generations;
318 
319 	spinlock_t node_map_lock;
320 
321 	u64 root_blkno;
322 	u64 system_dir_blkno;
323 	u64 bitmap_blkno;
324 	u32 bitmap_cpg;
325 	char *uuid_str;
326 	u32 uuid_hash;
327 	u8 *vol_label;
328 	u64 first_cluster_group_blkno;
329 	u32 fs_generation;
330 
331 	u32 s_feature_compat;
332 	u32 s_feature_incompat;
333 	u32 s_feature_ro_compat;
334 
335 	/* Protects s_next_generation, osb_flags and s_inode_steal_slot.
336 	 * Could protect more on osb as it's very short lived.
337 	 */
338 	spinlock_t osb_lock;
339 	u32 s_next_generation;
340 	unsigned long osb_flags;
341 	u16 s_inode_steal_slot;
342 	u16 s_meta_steal_slot;
343 	atomic_t s_num_inodes_stolen;
344 	atomic_t s_num_meta_stolen;
345 
346 	unsigned long s_mount_opt;
347 	unsigned int s_atime_quantum;
348 
349 	unsigned int max_slots;
350 	unsigned int node_num;
351 	int slot_num;
352 	int preferred_slot;
353 	int s_sectsize_bits;
354 	int s_clustersize;
355 	int s_clustersize_bits;
356 	unsigned int s_xattr_inline_size;
357 
358 	atomic_t vol_state;
359 	struct mutex recovery_lock;
360 	struct ocfs2_recovery_map *recovery_map;
361 	struct ocfs2_replay_map *replay_map;
362 	struct task_struct *recovery_thread_task;
363 	int disable_recovery;
364 	wait_queue_head_t checkpoint_event;
365 	struct ocfs2_journal *journal;
366 	unsigned long osb_commit_interval;
367 
368 	struct delayed_work		la_enable_wq;
369 
370 	/*
371 	 * Must hold local alloc i_mutex and osb->osb_lock to change
372 	 * local_alloc_bits. Reads can be done under either lock.
373 	 */
374 	unsigned int local_alloc_bits;
375 	unsigned int local_alloc_default_bits;
376 	/* osb_clusters_at_boot can become stale! Do not trust it to
377 	 * be up to date. */
378 	unsigned int osb_clusters_at_boot;
379 
380 	enum ocfs2_local_alloc_state local_alloc_state; /* protected
381 							 * by osb_lock */
382 
383 	struct buffer_head *local_alloc_bh;
384 
385 	u64 la_last_gd;
386 
387 	struct ocfs2_reservation_map	osb_la_resmap;
388 
389 	unsigned int	osb_resv_level;
390 	unsigned int	osb_dir_resv_level;
391 
392 	/* Next two fields are for local node slot recovery during
393 	 * mount. */
394 	struct ocfs2_dinode *local_alloc_copy;
395 	struct ocfs2_quota_recovery *quota_rec;
396 
397 	struct ocfs2_blockcheck_stats osb_ecc_stats;
398 	struct ocfs2_alloc_stats alloc_stats;
399 	char dev_str[20];		/* "major,minor" of the device */
400 
401 	u8 osb_stackflags;
402 
403 	char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
404 	char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
405 	struct ocfs2_cluster_connection *cconn;
406 	struct ocfs2_lock_res osb_super_lockres;
407 	struct ocfs2_lock_res osb_rename_lockres;
408 	struct ocfs2_lock_res osb_nfs_sync_lockres;
409 	struct rw_semaphore nfs_sync_rwlock;
410 	struct ocfs2_lock_res osb_trim_fs_lockres;
411 	struct ocfs2_dlm_debug *osb_dlm_debug;
412 
413 	struct dentry *osb_debug_root;
414 	struct dentry *osb_ctxt;
415 
416 	wait_queue_head_t recovery_event;
417 
418 	spinlock_t dc_task_lock;
419 	struct task_struct *dc_task;
420 	wait_queue_head_t dc_event;
421 	unsigned long dc_wake_sequence;
422 	unsigned long dc_work_sequence;
423 
424 	/*
425 	 * Any thread can add locks to the list, but the downconvert
426 	 * thread is the only one allowed to remove locks. Any change
427 	 * to this rule requires updating
428 	 * ocfs2_downconvert_thread_do_work().
429 	 */
430 	struct list_head blocked_lock_list;
431 	unsigned long blocked_lock_count;
432 
433 	/* List of dquot structures to drop last reference to */
434 	struct llist_head dquot_drop_list;
435 	struct work_struct dquot_drop_work;
436 
437 	wait_queue_head_t		osb_mount_event;
438 
439 	/* Truncate log info */
440 	struct inode			*osb_tl_inode;
441 	struct buffer_head		*osb_tl_bh;
442 	struct delayed_work		osb_truncate_log_wq;
443 	atomic_t			osb_tl_disable;
444 	/*
445 	 * How many clusters in our truncate log.
446 	 * It must be protected by osb_tl_inode->i_mutex.
447 	 */
448 	unsigned int truncated_clusters;
449 
450 	struct ocfs2_node_map		osb_recovering_orphan_dirs;
451 	unsigned int			*osb_orphan_wipes;
452 	wait_queue_head_t		osb_wipe_event;
453 
454 	struct ocfs2_orphan_scan	osb_orphan_scan;
455 
456 	/* used to protect metaecc calculation check of xattr. */
457 	spinlock_t osb_xattr_lock;
458 
459 	unsigned int			osb_dx_mask;
460 	u32				osb_dx_seed[4];
461 
462 	/* the group we used to allocate inodes. */
463 	u64				osb_inode_alloc_group;
464 
465 	/* rb tree root for refcount lock. */
466 	struct rb_root	osb_rf_lock_tree;
467 	struct ocfs2_refcount_tree *osb_ref_tree_lru;
468 
469 	struct mutex system_file_mutex;
470 
471 	/*
472 	 * OCFS2 needs to schedule several different types of work which
473 	 * require cluster locking, disk I/O, recovery waits, etc. Since these
474 	 * types of work tend to be heavy we avoid using the kernel events
475 	 * workqueue and schedule on our own.
476 	 */
477 	struct workqueue_struct *ocfs2_wq;
478 
479 	/* sysfs directory per partition */
480 	struct kset *osb_dev_kset;
481 
482 	/* file check related stuff */
483 	struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
484 };
485 
486 #define OCFS2_SB(sb)	    ((struct ocfs2_super *)(sb)->s_fs_info)
487 
488 /* Useful typedef for passing around journal access functions */
489 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
490 					 struct ocfs2_caching_info *ci,
491 					 struct buffer_head *bh, int type);
492 
ocfs2_should_order_data(struct inode * inode)493 static inline int ocfs2_should_order_data(struct inode *inode)
494 {
495 	if (!S_ISREG(inode->i_mode))
496 		return 0;
497 	if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
498 		return 0;
499 	return 1;
500 }
501 
ocfs2_sparse_alloc(struct ocfs2_super * osb)502 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
503 {
504 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
505 		return 1;
506 	return 0;
507 }
508 
ocfs2_writes_unwritten_extents(struct ocfs2_super * osb)509 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
510 {
511 	/*
512 	 * Support for sparse files is a pre-requisite
513 	 */
514 	if (!ocfs2_sparse_alloc(osb))
515 		return 0;
516 
517 	if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
518 		return 1;
519 	return 0;
520 }
521 
ocfs2_supports_append_dio(struct ocfs2_super * osb)522 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
523 {
524 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
525 		return 1;
526 	return 0;
527 }
528 
529 
ocfs2_supports_inline_data(struct ocfs2_super * osb)530 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
531 {
532 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
533 		return 1;
534 	return 0;
535 }
536 
ocfs2_supports_xattr(struct ocfs2_super * osb)537 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
538 {
539 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
540 		return 1;
541 	return 0;
542 }
543 
ocfs2_meta_ecc(struct ocfs2_super * osb)544 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
545 {
546 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
547 		return 1;
548 	return 0;
549 }
550 
ocfs2_supports_indexed_dirs(struct ocfs2_super * osb)551 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
552 {
553 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
554 		return 1;
555 	return 0;
556 }
557 
ocfs2_supports_discontig_bg(struct ocfs2_super * osb)558 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
559 {
560 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
561 		return 1;
562 	return 0;
563 }
564 
ocfs2_link_max(struct ocfs2_super * osb)565 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
566 {
567 	if (ocfs2_supports_indexed_dirs(osb))
568 		return OCFS2_DX_LINK_MAX;
569 	return OCFS2_LINK_MAX;
570 }
571 
ocfs2_read_links_count(struct ocfs2_dinode * di)572 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
573 {
574 	u32 nlink = le16_to_cpu(di->i_links_count);
575 	u32 hi = le16_to_cpu(di->i_links_count_hi);
576 
577 	if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
578 		nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
579 
580 	return nlink;
581 }
582 
ocfs2_set_links_count(struct ocfs2_dinode * di,u32 nlink)583 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
584 {
585 	u16 lo, hi;
586 
587 	lo = nlink;
588 	hi = nlink >> OCFS2_LINKS_HI_SHIFT;
589 
590 	di->i_links_count = cpu_to_le16(lo);
591 	di->i_links_count_hi = cpu_to_le16(hi);
592 }
593 
ocfs2_add_links_count(struct ocfs2_dinode * di,int n)594 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
595 {
596 	u32 links = ocfs2_read_links_count(di);
597 
598 	links += n;
599 
600 	ocfs2_set_links_count(di, links);
601 }
602 
ocfs2_refcount_tree(struct ocfs2_super * osb)603 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
604 {
605 	if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
606 		return 1;
607 	return 0;
608 }
609 
610 /* set / clear functions because cluster events can make these happen
611  * in parallel so we want the transitions to be atomic. this also
612  * means that any future flags osb_flags must be protected by spinlock
613  * too! */
ocfs2_set_osb_flag(struct ocfs2_super * osb,unsigned long flag)614 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
615 				      unsigned long flag)
616 {
617 	spin_lock(&osb->osb_lock);
618 	osb->osb_flags |= flag;
619 	spin_unlock(&osb->osb_lock);
620 }
621 
ocfs2_set_ro_flag(struct ocfs2_super * osb,int hard)622 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
623 				     int hard)
624 {
625 	spin_lock(&osb->osb_lock);
626 	osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
627 	if (hard)
628 		osb->osb_flags |= OCFS2_OSB_HARD_RO;
629 	else
630 		osb->osb_flags |= OCFS2_OSB_SOFT_RO;
631 	spin_unlock(&osb->osb_lock);
632 }
633 
ocfs2_is_hard_readonly(struct ocfs2_super * osb)634 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
635 {
636 	int ret;
637 
638 	spin_lock(&osb->osb_lock);
639 	ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
640 	spin_unlock(&osb->osb_lock);
641 
642 	return ret;
643 }
644 
ocfs2_is_soft_readonly(struct ocfs2_super * osb)645 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
646 {
647 	int ret;
648 
649 	spin_lock(&osb->osb_lock);
650 	ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
651 	spin_unlock(&osb->osb_lock);
652 
653 	return ret;
654 }
655 
ocfs2_clusterinfo_valid(struct ocfs2_super * osb)656 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
657 {
658 	return (osb->s_feature_incompat &
659 		(OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
660 		 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
661 }
662 
ocfs2_userspace_stack(struct ocfs2_super * osb)663 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
664 {
665 	if (ocfs2_clusterinfo_valid(osb) &&
666 	    memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
667 		   OCFS2_STACK_LABEL_LEN))
668 		return 1;
669 	return 0;
670 }
671 
ocfs2_o2cb_stack(struct ocfs2_super * osb)672 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
673 {
674 	if (ocfs2_clusterinfo_valid(osb) &&
675 	    !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
676 		   OCFS2_STACK_LABEL_LEN))
677 		return 1;
678 	return 0;
679 }
680 
ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super * osb)681 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
682 {
683 	return ocfs2_o2cb_stack(osb) &&
684 		(osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
685 }
686 
ocfs2_mount_local(struct ocfs2_super * osb)687 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
688 {
689 	return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
690 }
691 
ocfs2_uses_extended_slot_map(struct ocfs2_super * osb)692 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
693 {
694 	return (osb->s_feature_incompat &
695 		OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
696 }
697 
698 
699 #define OCFS2_IS_VALID_DINODE(ptr)					\
700 	(!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
701 
702 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)				\
703 	(!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
704 
705 #define OCFS2_IS_VALID_GROUP_DESC(ptr)					\
706 	(!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
707 
708 
709 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)					\
710 	(!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
711 
712 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)					\
713 	(!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
714 
715 #define OCFS2_IS_VALID_DX_ROOT(ptr)					\
716 	(!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
717 
718 #define OCFS2_IS_VALID_DX_LEAF(ptr)					\
719 	(!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
720 
721 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)				\
722 	(!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
723 
ino_from_blkno(struct super_block * sb,u64 blkno)724 static inline unsigned long ino_from_blkno(struct super_block *sb,
725 					   u64 blkno)
726 {
727 	return (unsigned long)(blkno & (u64)ULONG_MAX);
728 }
729 
ocfs2_clusters_to_blocks(struct super_block * sb,u32 clusters)730 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
731 					   u32 clusters)
732 {
733 	int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
734 		sb->s_blocksize_bits;
735 
736 	return (u64)clusters << c_to_b_bits;
737 }
738 
ocfs2_clusters_for_blocks(struct super_block * sb,u64 blocks)739 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb,
740 		u64 blocks)
741 {
742 	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
743 			sb->s_blocksize_bits;
744 
745 	blocks += (1 << b_to_c_bits) - 1;
746 	return (u32)(blocks >> b_to_c_bits);
747 }
748 
ocfs2_blocks_to_clusters(struct super_block * sb,u64 blocks)749 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
750 					   u64 blocks)
751 {
752 	int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
753 		sb->s_blocksize_bits;
754 
755 	return (u32)(blocks >> b_to_c_bits);
756 }
757 
ocfs2_clusters_for_bytes(struct super_block * sb,u64 bytes)758 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
759 						    u64 bytes)
760 {
761 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
762 	unsigned int clusters;
763 
764 	bytes += OCFS2_SB(sb)->s_clustersize - 1;
765 	/* OCFS2 just cannot have enough clusters to overflow this */
766 	clusters = (unsigned int)(bytes >> cl_bits);
767 
768 	return clusters;
769 }
770 
ocfs2_bytes_to_clusters(struct super_block * sb,u64 bytes)771 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
772 		u64 bytes)
773 {
774 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
775 	unsigned int clusters;
776 
777 	clusters = (unsigned int)(bytes >> cl_bits);
778 	return clusters;
779 }
780 
ocfs2_blocks_for_bytes(struct super_block * sb,u64 bytes)781 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
782 					 u64 bytes)
783 {
784 	bytes += sb->s_blocksize - 1;
785 	return bytes >> sb->s_blocksize_bits;
786 }
787 
ocfs2_clusters_to_bytes(struct super_block * sb,u32 clusters)788 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
789 					  u32 clusters)
790 {
791 	return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
792 }
793 
ocfs2_block_to_cluster_start(struct super_block * sb,u64 blocks)794 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
795 					       u64 blocks)
796 {
797 	int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
798 	unsigned int clusters;
799 
800 	clusters = ocfs2_blocks_to_clusters(sb, blocks);
801 	return (u64)clusters << bits;
802 }
803 
ocfs2_align_bytes_to_clusters(struct super_block * sb,u64 bytes)804 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
805 						u64 bytes)
806 {
807 	int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
808 	unsigned int clusters;
809 
810 	clusters = ocfs2_clusters_for_bytes(sb, bytes);
811 	return (u64)clusters << cl_bits;
812 }
813 
ocfs2_align_bytes_to_blocks(struct super_block * sb,u64 bytes)814 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
815 					      u64 bytes)
816 {
817 	u64 blocks;
818 
819         blocks = ocfs2_blocks_for_bytes(sb, bytes);
820 	return blocks << sb->s_blocksize_bits;
821 }
822 
ocfs2_align_bytes_to_sectors(u64 bytes)823 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
824 {
825 	return (unsigned long)((bytes + 511) >> 9);
826 }
827 
ocfs2_page_index_to_clusters(struct super_block * sb,unsigned long pg_index)828 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
829 							unsigned long pg_index)
830 {
831 	u32 clusters = pg_index;
832 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
833 
834 	if (unlikely(PAGE_SHIFT > cbits))
835 		clusters = pg_index << (PAGE_SHIFT - cbits);
836 	else if (PAGE_SHIFT < cbits)
837 		clusters = pg_index >> (cbits - PAGE_SHIFT);
838 
839 	return clusters;
840 }
841 
842 /*
843  * Find the 1st page index which covers the given clusters.
844  */
ocfs2_align_clusters_to_page_index(struct super_block * sb,u32 clusters)845 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
846 							u32 clusters)
847 {
848 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
849         pgoff_t index = clusters;
850 
851 	if (PAGE_SHIFT > cbits) {
852 		index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
853 	} else if (PAGE_SHIFT < cbits) {
854 		index = (pgoff_t)clusters << (cbits - PAGE_SHIFT);
855 	}
856 
857 	return index;
858 }
859 
ocfs2_pages_per_cluster(struct super_block * sb)860 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
861 {
862 	unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
863 	unsigned int pages_per_cluster = 1;
864 
865 	if (PAGE_SHIFT < cbits)
866 		pages_per_cluster = 1 << (cbits - PAGE_SHIFT);
867 
868 	return pages_per_cluster;
869 }
870 
ocfs2_megabytes_to_clusters(struct super_block * sb,unsigned int megs)871 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
872 						       unsigned int megs)
873 {
874 	BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
875 
876 	return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
877 }
878 
ocfs2_clusters_to_megabytes(struct super_block * sb,unsigned int clusters)879 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
880 						       unsigned int clusters)
881 {
882 	return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
883 }
884 
_ocfs2_set_bit(unsigned int bit,unsigned long * bitmap)885 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
886 {
887 	__set_bit_le(bit, bitmap);
888 }
889 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
890 
_ocfs2_clear_bit(unsigned int bit,unsigned long * bitmap)891 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
892 {
893 	__clear_bit_le(bit, bitmap);
894 }
895 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
896 
897 #define ocfs2_test_bit test_bit_le
898 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
899 #define ocfs2_find_next_bit find_next_bit_le
900 
correct_addr_and_bit_unaligned(int * bit,void * addr)901 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
902 {
903 #if BITS_PER_LONG == 64
904 	*bit += ((unsigned long) addr & 7UL) << 3;
905 	addr = (void *) ((unsigned long) addr & ~7UL);
906 #elif BITS_PER_LONG == 32
907 	*bit += ((unsigned long) addr & 3UL) << 3;
908 	addr = (void *) ((unsigned long) addr & ~3UL);
909 #else
910 #error "how many bits you are?!"
911 #endif
912 	return addr;
913 }
914 
ocfs2_set_bit_unaligned(int bit,void * bitmap)915 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
916 {
917 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
918 	ocfs2_set_bit(bit, bitmap);
919 }
920 
ocfs2_clear_bit_unaligned(int bit,void * bitmap)921 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
922 {
923 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
924 	ocfs2_clear_bit(bit, bitmap);
925 }
926 
ocfs2_test_bit_unaligned(int bit,void * bitmap)927 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
928 {
929 	bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
930 	return ocfs2_test_bit(bit, bitmap);
931 }
932 
ocfs2_find_next_zero_bit_unaligned(void * bitmap,int max,int start)933 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
934 							int start)
935 {
936 	int fix = 0, ret, tmpmax;
937 	bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
938 	tmpmax = max + fix;
939 	start += fix;
940 
941 	ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
942 	if (ret > max)
943 		return max;
944 	return ret;
945 }
946 
947 #endif  /* OCFS2_H */
948 
949