1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
5  */
6 
7 #ifndef __INCORE_DOT_H__
8 #define __INCORE_DOT_H__
9 
10 #include <linux/fs.h>
11 #include <linux/kobject.h>
12 #include <linux/workqueue.h>
13 #include <linux/dlm.h>
14 #include <linux/buffer_head.h>
15 #include <linux/rcupdate.h>
16 #include <linux/rculist_bl.h>
17 #include <linux/completion.h>
18 #include <linux/rbtree.h>
19 #include <linux/ktime.h>
20 #include <linux/percpu.h>
21 #include <linux/lockref.h>
22 #include <linux/rhashtable.h>
23 #include <linux/mutex.h>
24 
25 #define DIO_WAIT	0x00000010
26 #define DIO_METADATA	0x00000020
27 
28 struct gfs2_log_operations;
29 struct gfs2_bufdata;
30 struct gfs2_holder;
31 struct gfs2_glock;
32 struct gfs2_quota_data;
33 struct gfs2_trans;
34 struct gfs2_jdesc;
35 struct gfs2_sbd;
36 struct lm_lockops;
37 
38 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
39 
40 struct gfs2_log_header_host {
41 	u64 lh_sequence;	/* Sequence number of this transaction */
42 	u32 lh_flags;		/* GFS2_LOG_HEAD_... */
43 	u32 lh_tail;		/* Block number of log tail */
44 	u32 lh_blkno;
45 
46 	s64 lh_local_total;
47 	s64 lh_local_free;
48 	s64 lh_local_dinodes;
49 };
50 
51 /*
52  * Structure of operations that are associated with each
53  * type of element in the log.
54  */
55 
56 struct gfs2_log_operations {
57 	void (*lo_before_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
58 	void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
59 	void (*lo_before_scan) (struct gfs2_jdesc *jd,
60 				struct gfs2_log_header_host *head, int pass);
61 	int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
62 				 struct gfs2_log_descriptor *ld, __be64 *ptr,
63 				 int pass);
64 	void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
65 	const char *lo_name;
66 };
67 
68 #define GBF_FULL 1
69 
70 /**
71  * Clone bitmaps (bi_clone):
72  *
73  * - When a block is freed, we remember the previous state of the block in the
74  *   clone bitmap, and only mark the block as free in the real bitmap.
75  *
76  * - When looking for a block to allocate, we check for a free block in the
77  *   clone bitmap, and if no clone bitmap exists, in the real bitmap.
78  *
79  * - For allocating a block, we mark it as allocated in the real bitmap, and if
80  *   a clone bitmap exists, also in the clone bitmap.
81  *
82  * - At the end of a log_flush, we copy the real bitmap into the clone bitmap
83  *   to make the clone bitmap reflect the current allocation state.
84  *   (Alternatively, we could remove the clone bitmap.)
85  *
86  * The clone bitmaps are in-core only, and is never written to disk.
87  *
88  * These steps ensure that blocks which have been freed in a transaction cannot
89  * be reallocated in that same transaction.
90  */
91 struct gfs2_bitmap {
92 	struct buffer_head *bi_bh;
93 	char *bi_clone;
94 	unsigned long bi_flags;
95 	u32 bi_offset;
96 	u32 bi_start;
97 	u32 bi_bytes;
98 	u32 bi_blocks;
99 };
100 
101 struct gfs2_rgrpd {
102 	struct rb_node rd_node;		/* Link with superblock */
103 	struct gfs2_glock *rd_gl;	/* Glock for this rgrp */
104 	u64 rd_addr;			/* grp block disk address */
105 	u64 rd_data0;			/* first data location */
106 	u32 rd_length;			/* length of rgrp header in fs blocks */
107 	u32 rd_data;			/* num of data blocks in rgrp */
108 	u32 rd_bitbytes;		/* number of bytes in data bitmaps */
109 	u32 rd_free;
110 	u32 rd_requested;		/* number of blocks in rd_rstree */
111 	u32 rd_reserved;		/* number of reserved blocks */
112 	u32 rd_free_clone;
113 	u32 rd_dinodes;
114 	u64 rd_igeneration;
115 	struct gfs2_bitmap *rd_bits;
116 	struct gfs2_sbd *rd_sbd;
117 	struct gfs2_rgrp_lvb *rd_rgl;
118 	u32 rd_last_alloc;
119 	u32 rd_flags;
120 	u32 rd_extfail_pt;		/* extent failure point */
121 #define GFS2_RDF_CHECK		0x10000000 /* check for unlinked inodes */
122 #define GFS2_RDF_ERROR		0x40000000 /* error in rg */
123 #define GFS2_RDF_PREFERRED	0x80000000 /* This rgrp is preferred */
124 #define GFS2_RDF_MASK		0xf0000000 /* mask for internal flags */
125 	spinlock_t rd_rsspin;           /* protects reservation related vars */
126 	struct mutex rd_mutex;
127 	struct rb_root rd_rstree;       /* multi-block reservation tree */
128 };
129 
130 enum gfs2_state_bits {
131 	BH_Pinned = BH_PrivateStart,
132 	BH_Escaped = BH_PrivateStart + 1,
133 };
134 
135 BUFFER_FNS(Pinned, pinned)
136 TAS_BUFFER_FNS(Pinned, pinned)
137 BUFFER_FNS(Escaped, escaped)
138 TAS_BUFFER_FNS(Escaped, escaped)
139 
140 struct gfs2_bufdata {
141 	struct buffer_head *bd_bh;
142 	struct gfs2_glock *bd_gl;
143 	u64 bd_blkno;
144 
145 	struct list_head bd_list;
146 
147 	struct gfs2_trans *bd_tr;
148 	struct list_head bd_ail_st_list;
149 	struct list_head bd_ail_gl_list;
150 };
151 
152 /*
153  * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
154  * prefix of lock_dlm_ gets awkward.
155  */
156 
157 #define GDLM_STRNAME_BYTES	25
158 #define GDLM_LVB_SIZE		32
159 
160 /*
161  * ls_recover_flags:
162  *
163  * DFL_BLOCK_LOCKS: dlm is in recovery and will grant locks that had been
164  * held by failed nodes whose journals need recovery.  Those locks should
165  * only be used for journal recovery until the journal recovery is done.
166  * This is set by the dlm recover_prep callback and cleared by the
167  * gfs2_control thread when journal recovery is complete.  To avoid
168  * races between recover_prep setting and gfs2_control clearing, recover_spin
169  * is held while changing this bit and reading/writing recover_block
170  * and recover_start.
171  *
172  * DFL_NO_DLM_OPS: dlm lockspace ops/callbacks are not being used.
173  *
174  * DFL_FIRST_MOUNT: this node is the first to mount this fs and is doing
175  * recovery of all journals before allowing other nodes to mount the fs.
176  * This is cleared when FIRST_MOUNT_DONE is set.
177  *
178  * DFL_FIRST_MOUNT_DONE: this node was the first mounter, and has finished
179  * recovery of all journals, and now allows other nodes to mount the fs.
180  *
181  * DFL_MOUNT_DONE: gdlm_mount has completed successfully and cleared
182  * BLOCK_LOCKS for the first time.  The gfs2_control thread should now
183  * control clearing BLOCK_LOCKS for further recoveries.
184  *
185  * DFL_UNMOUNT: gdlm_unmount sets to keep sdp off gfs2_control_wq.
186  *
187  * DFL_DLM_RECOVERY: set while dlm is in recovery, between recover_prep()
188  * and recover_done(), i.e. set while recover_block == recover_start.
189  */
190 
191 enum {
192 	DFL_BLOCK_LOCKS		= 0,
193 	DFL_NO_DLM_OPS		= 1,
194 	DFL_FIRST_MOUNT		= 2,
195 	DFL_FIRST_MOUNT_DONE	= 3,
196 	DFL_MOUNT_DONE		= 4,
197 	DFL_UNMOUNT		= 5,
198 	DFL_DLM_RECOVERY	= 6,
199 };
200 
201 /*
202  * We are using struct lm_lockname as an rhashtable key.  Avoid holes within
203  * the struct; padding at the end is fine.
204  */
205 struct lm_lockname {
206 	u64 ln_number;
207 	struct gfs2_sbd *ln_sbd;
208 	unsigned int ln_type;
209 };
210 
211 #define lm_name_equal(name1, name2) \
212         (((name1)->ln_number == (name2)->ln_number) &&	\
213 	 ((name1)->ln_type == (name2)->ln_type) &&	\
214 	 ((name1)->ln_sbd == (name2)->ln_sbd))
215 
216 
217 struct gfs2_glock_operations {
218 	int (*go_sync) (struct gfs2_glock *gl);
219 	int (*go_xmote_bh)(struct gfs2_glock *gl);
220 	void (*go_inval) (struct gfs2_glock *gl, int flags);
221 	int (*go_demote_ok) (const struct gfs2_glock *gl);
222 	int (*go_instantiate) (struct gfs2_holder *gh);
223 	void (*go_dump)(struct seq_file *seq, struct gfs2_glock *gl,
224 			const char *fs_id_buf);
225 	void (*go_callback)(struct gfs2_glock *gl, bool remote);
226 	void (*go_free)(struct gfs2_glock *gl);
227 	const int go_subclass;
228 	const int go_type;
229 	const unsigned long go_flags;
230 #define GLOF_ASPACE 1 /* address space attached */
231 #define GLOF_LVB    2 /* Lock Value Block attached */
232 #define GLOF_LRU    4 /* LRU managed */
233 #define GLOF_NONDISK   8 /* not I/O related */
234 };
235 
236 enum {
237 	GFS2_LKS_SRTT = 0,	/* Non blocking smoothed round trip time */
238 	GFS2_LKS_SRTTVAR = 1,	/* Non blocking smoothed variance */
239 	GFS2_LKS_SRTTB = 2,	/* Blocking smoothed round trip time */
240 	GFS2_LKS_SRTTVARB = 3,	/* Blocking smoothed variance */
241 	GFS2_LKS_SIRT = 4,	/* Smoothed Inter-request time */
242 	GFS2_LKS_SIRTVAR = 5,	/* Smoothed Inter-request variance */
243 	GFS2_LKS_DCOUNT = 6,	/* Count of dlm requests */
244 	GFS2_LKS_QCOUNT = 7,	/* Count of gfs2_holder queues */
245 	GFS2_NR_LKSTATS
246 };
247 
248 struct gfs2_lkstats {
249 	u64 stats[GFS2_NR_LKSTATS];
250 };
251 
252 enum {
253 	/* States */
254 	HIF_MAY_DEMOTE		= 1,
255 	HIF_HOLDER		= 6,  /* Set for gh that "holds" the glock */
256 	HIF_WAIT		= 10,
257 };
258 
259 struct gfs2_holder {
260 	struct list_head gh_list;
261 
262 	struct gfs2_glock *gh_gl;
263 	struct pid *gh_owner_pid;
264 	u16 gh_flags;
265 	u16 gh_state;
266 
267 	int gh_error;
268 	unsigned long gh_iflags; /* HIF_... */
269 	unsigned long gh_ip;
270 };
271 
272 /* Number of quota types we support */
273 #define GFS2_MAXQUOTAS 2
274 
275 struct gfs2_qadata { /* quota allocation data */
276 	/* Quota stuff */
277 	struct gfs2_quota_data *qa_qd[2 * GFS2_MAXQUOTAS];
278 	struct gfs2_holder qa_qd_ghs[2 * GFS2_MAXQUOTAS];
279 	unsigned int qa_qd_num;
280 	int qa_ref;
281 };
282 
283 /* Resource group multi-block reservation, in order of appearance:
284 
285    Step 1. Function prepares to write, allocates a mb, sets the size hint.
286    Step 2. User calls inplace_reserve to target an rgrp, sets the rgrp info
287    Step 3. Function get_local_rgrp locks the rgrp, determines which bits to use
288    Step 4. Bits are assigned from the rgrp based on either the reservation
289            or wherever it can.
290 */
291 
292 struct gfs2_blkreserv {
293 	struct rb_node rs_node;       /* node within rd_rstree */
294 	struct gfs2_rgrpd *rs_rgd;
295 	u64 rs_start;
296 	u32 rs_requested;
297 	u32 rs_reserved;              /* number of reserved blocks */
298 };
299 
300 /*
301  * Allocation parameters
302  * @target: The number of blocks we'd ideally like to allocate
303  * @aflags: The flags (e.g. Orlov flag)
304  *
305  * The intent is to gradually expand this structure over time in
306  * order to give more information, e.g. alignment, min extent size
307  * to the allocation code.
308  */
309 struct gfs2_alloc_parms {
310 	u64 target;
311 	u32 min_target;
312 	u32 aflags;
313 	u64 allowed;
314 };
315 
316 enum {
317 	GLF_LOCK			= 1,
318 	GLF_INSTANTIATE_NEEDED		= 2, /* needs instantiate */
319 	GLF_DEMOTE			= 3,
320 	GLF_PENDING_DEMOTE		= 4,
321 	GLF_DEMOTE_IN_PROGRESS		= 5,
322 	GLF_DIRTY			= 6,
323 	GLF_LFLUSH			= 7,
324 	GLF_INVALIDATE_IN_PROGRESS	= 8,
325 	GLF_REPLY_PENDING		= 9,
326 	GLF_INITIAL			= 10,
327 	GLF_FROZEN			= 11,
328 	GLF_INSTANTIATE_IN_PROG		= 12, /* instantiate happening now */
329 	GLF_LRU				= 13,
330 	GLF_OBJECT			= 14, /* Used only for tracing */
331 	GLF_BLOCKING			= 15,
332 	GLF_PENDING_DELETE		= 17,
333 	GLF_FREEING			= 18, /* Wait for glock to be freed */
334 };
335 
336 struct gfs2_glock {
337 	unsigned long gl_flags;		/* GLF_... */
338 	struct lm_lockname gl_name;
339 
340 	struct lockref gl_lockref;
341 
342 	/* State fields protected by gl_lockref.lock */
343 	unsigned int gl_state:2,	/* Current state */
344 		     gl_target:2,	/* Target state */
345 		     gl_demote_state:2,	/* State requested by remote node */
346 		     gl_req:2,		/* State in last dlm request */
347 		     gl_reply:8;	/* Last reply from the dlm */
348 
349 	unsigned long gl_demote_time; /* time of first demote request */
350 	long gl_hold_time;
351 	struct list_head gl_holders;
352 
353 	const struct gfs2_glock_operations *gl_ops;
354 	ktime_t gl_dstamp;
355 	struct gfs2_lkstats gl_stats;
356 	struct dlm_lksb gl_lksb;
357 	unsigned long gl_tchange;
358 	void *gl_object;
359 
360 	struct list_head gl_lru;
361 	struct list_head gl_ail_list;
362 	atomic_t gl_ail_count;
363 	atomic_t gl_revokes;
364 	struct delayed_work gl_work;
365 	/* For iopen glocks only */
366 	struct {
367 		struct delayed_work gl_delete;
368 		u64 gl_no_formal_ino;
369 	};
370 	struct rcu_head gl_rcu;
371 	struct rhash_head gl_node;
372 };
373 
374 enum {
375 	GIF_QD_LOCKED		= 1,
376 	GIF_ALLOC_FAILED	= 2,
377 	GIF_SW_PAGED		= 3,
378 	GIF_FREE_VFS_INODE      = 5,
379 	GIF_GLOP_PENDING	= 6,
380 	GIF_DEFERRED_DELETE	= 7,
381 };
382 
383 struct gfs2_inode {
384 	struct inode i_inode;
385 	u64 i_no_addr;
386 	u64 i_no_formal_ino;
387 	u64 i_generation;
388 	u64 i_eattr;
389 	unsigned long i_flags;		/* GIF_... */
390 	struct gfs2_glock *i_gl;
391 	struct gfs2_holder i_iopen_gh;
392 	struct gfs2_qadata *i_qadata; /* quota allocation data */
393 	struct gfs2_holder i_rgd_gh;
394 	struct gfs2_blkreserv i_res; /* rgrp multi-block reservation */
395 	u64 i_goal;	/* goal block for allocations */
396 	atomic_t i_sizehint;  /* hint of the write size */
397 	struct rw_semaphore i_rw_mutex;
398 	struct list_head i_ordered;
399 	struct list_head i_trunc_list;
400 	__be64 *i_hash_cache;
401 	u32 i_entries;
402 	u32 i_diskflags;
403 	u8 i_height;
404 	u8 i_depth;
405 	u16 i_rahead;
406 };
407 
408 /*
409  * Since i_inode is the first element of struct gfs2_inode,
410  * this is effectively a cast.
411  */
GFS2_I(struct inode * inode)412 static inline struct gfs2_inode *GFS2_I(struct inode *inode)
413 {
414 	return container_of(inode, struct gfs2_inode, i_inode);
415 }
416 
GFS2_SB(const struct inode * inode)417 static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
418 {
419 	return inode->i_sb->s_fs_info;
420 }
421 
422 struct gfs2_file {
423 	struct mutex f_fl_mutex;
424 	struct gfs2_holder f_fl_gh;
425 };
426 
427 struct gfs2_revoke_replay {
428 	struct list_head rr_list;
429 	u64 rr_blkno;
430 	unsigned int rr_where;
431 };
432 
433 enum {
434 	QDF_CHANGE		= 1,
435 	QDF_LOCKED		= 2,
436 	QDF_REFRESH		= 3,
437 	QDF_QMSG_QUIET          = 4,
438 };
439 
440 struct gfs2_quota_data {
441 	struct hlist_bl_node qd_hlist;
442 	struct list_head qd_list;
443 	struct kqid qd_id;
444 	struct gfs2_sbd *qd_sbd;
445 	struct lockref qd_lockref;
446 	struct list_head qd_lru;
447 	unsigned qd_hash;
448 
449 	unsigned long qd_flags;		/* QDF_... */
450 
451 	s64 qd_change;
452 	s64 qd_change_sync;
453 
454 	unsigned int qd_slot;
455 	unsigned int qd_slot_count;
456 
457 	struct buffer_head *qd_bh;
458 	struct gfs2_quota_change *qd_bh_qc;
459 	unsigned int qd_bh_count;
460 
461 	struct gfs2_glock *qd_gl;
462 	struct gfs2_quota_lvb qd_qb;
463 
464 	u64 qd_sync_gen;
465 	unsigned long qd_last_warn;
466 	struct rcu_head qd_rcu;
467 };
468 
469 enum {
470 	TR_TOUCHED = 1,
471 	TR_ATTACHED = 2,
472 	TR_ONSTACK = 3,
473 };
474 
475 struct gfs2_trans {
476 	unsigned long tr_ip;
477 
478 	unsigned int tr_blocks;
479 	unsigned int tr_revokes;
480 	unsigned int tr_reserved;
481 	unsigned long tr_flags;
482 
483 	unsigned int tr_num_buf_new;
484 	unsigned int tr_num_databuf_new;
485 	unsigned int tr_num_buf_rm;
486 	unsigned int tr_num_databuf_rm;
487 	unsigned int tr_num_revoke;
488 
489 	struct list_head tr_list;
490 	struct list_head tr_databuf;
491 	struct list_head tr_buf;
492 
493 	unsigned int tr_first;
494 	struct list_head tr_ail1_list;
495 	struct list_head tr_ail2_list;
496 };
497 
498 struct gfs2_journal_extent {
499 	struct list_head list;
500 
501 	unsigned int lblock; /* First logical block */
502 	u64 dblock; /* First disk block */
503 	u64 blocks;
504 };
505 
506 struct gfs2_jdesc {
507 	struct list_head jd_list;
508 	struct list_head extent_list;
509 	unsigned int nr_extents;
510 	struct work_struct jd_work;
511 	struct inode *jd_inode;
512 	struct bio *jd_log_bio;
513 	unsigned long jd_flags;
514 #define JDF_RECOVERY 1
515 	unsigned int jd_jid;
516 	u32 jd_blocks;
517 	int jd_recover_error;
518 	/* Replay stuff */
519 
520 	unsigned int jd_found_blocks;
521 	unsigned int jd_found_revokes;
522 	unsigned int jd_replayed_blocks;
523 
524 	struct list_head jd_revoke_list;
525 	unsigned int jd_replay_tail;
526 
527 	u64 jd_no_addr;
528 };
529 
530 struct gfs2_statfs_change_host {
531 	s64 sc_total;
532 	s64 sc_free;
533 	s64 sc_dinodes;
534 };
535 
536 #define GFS2_QUOTA_DEFAULT	GFS2_QUOTA_OFF
537 #define GFS2_QUOTA_OFF		0
538 #define GFS2_QUOTA_ACCOUNT	1
539 #define GFS2_QUOTA_ON		2
540 
541 #define GFS2_DATA_DEFAULT	GFS2_DATA_ORDERED
542 #define GFS2_DATA_WRITEBACK	1
543 #define GFS2_DATA_ORDERED	2
544 
545 #define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
546 #define GFS2_ERRORS_WITHDRAW    0
547 #define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
548 #define GFS2_ERRORS_RO          2 /* place holder for future feature */
549 #define GFS2_ERRORS_PANIC       3
550 
551 struct gfs2_args {
552 	char ar_lockproto[GFS2_LOCKNAME_LEN];	/* Name of the Lock Protocol */
553 	char ar_locktable[GFS2_LOCKNAME_LEN];	/* Name of the Lock Table */
554 	char ar_hostdata[GFS2_LOCKNAME_LEN];	/* Host specific data */
555 	unsigned int ar_spectator:1;		/* Don't get a journal */
556 	unsigned int ar_localflocks:1;		/* Let the VFS do flock|fcntl */
557 	unsigned int ar_debug:1;		/* Oops on errors */
558 	unsigned int ar_posix_acl:1;		/* Enable posix acls */
559 	unsigned int ar_quota:2;		/* off/account/on */
560 	unsigned int ar_suiddir:1;		/* suiddir support */
561 	unsigned int ar_data:2;			/* ordered/writeback */
562 	unsigned int ar_meta:1;			/* mount metafs */
563 	unsigned int ar_discard:1;		/* discard requests */
564 	unsigned int ar_errors:2;               /* errors=withdraw | panic */
565 	unsigned int ar_nobarrier:1;            /* do not send barriers */
566 	unsigned int ar_rgrplvb:1;		/* use lvbs for rgrp info */
567 	unsigned int ar_got_rgrplvb:1;		/* Was the rgrplvb opt given? */
568 	unsigned int ar_loccookie:1;		/* use location based readdir
569 						   cookies */
570 	s32 ar_commit;				/* Commit interval */
571 	s32 ar_statfs_quantum;			/* The fast statfs interval */
572 	s32 ar_quota_quantum;			/* The quota interval */
573 	s32 ar_statfs_percent;			/* The % change to force sync */
574 };
575 
576 struct gfs2_tune {
577 	spinlock_t gt_spin;
578 
579 	unsigned int gt_logd_secs;
580 
581 	unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
582 	unsigned int gt_quota_scale_num; /* Numerator */
583 	unsigned int gt_quota_scale_den; /* Denominator */
584 	unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
585 	unsigned int gt_new_files_jdata;
586 	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
587 	unsigned int gt_complain_secs;
588 	unsigned int gt_statfs_quantum;
589 	unsigned int gt_statfs_slow;
590 };
591 
592 enum {
593 	SDF_JOURNAL_CHECKED	= 0,
594 	SDF_JOURNAL_LIVE	= 1,
595 	SDF_WITHDRAWN		= 2,
596 	SDF_NOBARRIERS		= 3,
597 	SDF_NORECOVERY		= 4,
598 	SDF_DEMOTE		= 5,
599 	SDF_NOJOURNALID		= 6,
600 	SDF_RORECOVERY		= 7, /* read only recovery */
601 	SDF_SKIP_DLM_UNLOCK	= 8,
602 	SDF_FORCE_AIL_FLUSH     = 9,
603 	SDF_FS_FROZEN           = 10,
604 	SDF_WITHDRAWING		= 11, /* Will withdraw eventually */
605 	SDF_WITHDRAW_IN_PROG	= 12, /* Withdraw is in progress */
606 	SDF_REMOTE_WITHDRAW	= 13, /* Performing remote recovery */
607 	SDF_WITHDRAW_RECOVERY	= 14, /* Wait for journal recovery when we are
608 					 withdrawing */
609 };
610 
611 enum gfs2_freeze_state {
612 	SFS_UNFROZEN		= 0,
613 	SFS_STARTING_FREEZE	= 1,
614 	SFS_FROZEN		= 2,
615 };
616 
617 #define GFS2_FSNAME_LEN		256
618 
619 struct gfs2_inum_host {
620 	u64 no_formal_ino;
621 	u64 no_addr;
622 };
623 
624 struct gfs2_sb_host {
625 	u32 sb_magic;
626 	u32 sb_type;
627 
628 	u32 sb_fs_format;
629 	u32 sb_multihost_format;
630 	u32 sb_bsize;
631 	u32 sb_bsize_shift;
632 
633 	struct gfs2_inum_host sb_master_dir;
634 	struct gfs2_inum_host sb_root_dir;
635 
636 	char sb_lockproto[GFS2_LOCKNAME_LEN];
637 	char sb_locktable[GFS2_LOCKNAME_LEN];
638 };
639 
640 /*
641  * lm_mount() return values
642  *
643  * ls_jid - the journal ID this node should use
644  * ls_first - this node is the first to mount the file system
645  * ls_lockspace - lock module's context for this file system
646  * ls_ops - lock module's functions
647  */
648 
649 struct lm_lockstruct {
650 	int ls_jid;
651 	unsigned int ls_first;
652 	const struct lm_lockops *ls_ops;
653 	dlm_lockspace_t *ls_dlm;
654 
655 	int ls_recover_jid_done;   /* These two are deprecated, */
656 	int ls_recover_jid_status; /* used previously by gfs_controld */
657 
658 	struct dlm_lksb ls_mounted_lksb; /* mounted_lock */
659 	struct dlm_lksb ls_control_lksb; /* control_lock */
660 	char ls_control_lvb[GDLM_LVB_SIZE]; /* control_lock lvb */
661 	struct completion ls_sync_wait; /* {control,mounted}_{lock,unlock} */
662 	char *ls_lvb_bits;
663 
664 	spinlock_t ls_recover_spin; /* protects following fields */
665 	unsigned long ls_recover_flags; /* DFL_ */
666 	uint32_t ls_recover_mount; /* gen in first recover_done cb */
667 	uint32_t ls_recover_start; /* gen in last recover_done cb */
668 	uint32_t ls_recover_block; /* copy recover_start in last recover_prep */
669 	uint32_t ls_recover_size; /* size of recover_submit, recover_result */
670 	uint32_t *ls_recover_submit; /* gen in last recover_slot cb per jid */
671 	uint32_t *ls_recover_result; /* result of last jid recovery */
672 };
673 
674 struct gfs2_pcpu_lkstats {
675 	/* One struct for each glock type */
676 	struct gfs2_lkstats lkstats[10];
677 };
678 
679 /* List of local (per node) statfs inodes */
680 struct local_statfs_inode {
681 	struct list_head si_list;
682 	struct inode *si_sc_inode;
683 	unsigned int si_jid; /* journal id this statfs inode corresponds to */
684 };
685 
686 struct gfs2_sbd {
687 	struct super_block *sd_vfs;
688 	struct gfs2_pcpu_lkstats __percpu *sd_lkstats;
689 	struct kobject sd_kobj;
690 	struct completion sd_kobj_unregister;
691 	unsigned long sd_flags;	/* SDF_... */
692 	struct gfs2_sb_host sd_sb;
693 
694 	/* Constants computed on mount */
695 
696 	u32 sd_fsb2bb;
697 	u32 sd_fsb2bb_shift;
698 	u32 sd_diptrs;	/* Number of pointers in a dinode */
699 	u32 sd_inptrs;	/* Number of pointers in a indirect block */
700 	u32 sd_ldptrs;  /* Number of pointers in a log descriptor block */
701 	u32 sd_jbsize;	/* Size of a journaled data block */
702 	u32 sd_hash_bsize;	/* sizeof(exhash block) */
703 	u32 sd_hash_bsize_shift;
704 	u32 sd_hash_ptrs;	/* Number of pointers in a hash block */
705 	u32 sd_qc_per_block;
706 	u32 sd_blocks_per_bitmap;
707 	u32 sd_max_dirres;	/* Max blocks needed to add a directory entry */
708 	u32 sd_max_height;	/* Max height of a file's metadata tree */
709 	u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
710 	u32 sd_max_dents_per_leaf; /* Max number of dirents in a leaf block */
711 
712 	struct gfs2_args sd_args;	/* Mount arguments */
713 	struct gfs2_tune sd_tune;	/* Filesystem tuning structure */
714 
715 	/* Lock Stuff */
716 
717 	struct lm_lockstruct sd_lockstruct;
718 	struct gfs2_holder sd_live_gh;
719 	struct gfs2_glock *sd_rename_gl;
720 	struct gfs2_glock *sd_freeze_gl;
721 	struct work_struct sd_freeze_work;
722 	wait_queue_head_t sd_glock_wait;
723 	wait_queue_head_t sd_async_glock_wait;
724 	atomic_t sd_glock_disposal;
725 	struct completion sd_locking_init;
726 	struct completion sd_wdack;
727 	struct delayed_work sd_control_work;
728 
729 	/* Inode Stuff */
730 
731 	struct dentry *sd_master_dir;
732 	struct dentry *sd_root_dir;
733 
734 	struct inode *sd_jindex;
735 	struct inode *sd_statfs_inode;
736 	struct inode *sd_sc_inode;
737 	struct list_head sd_sc_inodes_list;
738 	struct inode *sd_qc_inode;
739 	struct inode *sd_rindex;
740 	struct inode *sd_quota_inode;
741 
742 	/* StatFS stuff */
743 
744 	spinlock_t sd_statfs_spin;
745 	struct gfs2_statfs_change_host sd_statfs_master;
746 	struct gfs2_statfs_change_host sd_statfs_local;
747 	int sd_statfs_force_sync;
748 
749 	/* Resource group stuff */
750 
751 	int sd_rindex_uptodate;
752 	spinlock_t sd_rindex_spin;
753 	struct rb_root sd_rindex_tree;
754 	unsigned int sd_rgrps;
755 	unsigned int sd_max_rg_data;
756 
757 	/* Journal index stuff */
758 
759 	struct list_head sd_jindex_list;
760 	spinlock_t sd_jindex_spin;
761 	struct mutex sd_jindex_mutex;
762 	unsigned int sd_journals;
763 
764 	struct gfs2_jdesc *sd_jdesc;
765 	struct gfs2_holder sd_journal_gh;
766 	struct gfs2_holder sd_jinode_gh;
767 	struct gfs2_glock *sd_jinode_gl;
768 
769 	struct gfs2_holder sd_sc_gh;
770 	struct buffer_head *sd_sc_bh;
771 	struct gfs2_holder sd_qc_gh;
772 
773 	struct completion sd_journal_ready;
774 
775 	/* Daemon stuff */
776 
777 	struct task_struct *sd_logd_process;
778 	struct task_struct *sd_quotad_process;
779 
780 	/* Quota stuff */
781 
782 	struct list_head sd_quota_list;
783 	atomic_t sd_quota_count;
784 	struct mutex sd_quota_mutex;
785 	struct mutex sd_quota_sync_mutex;
786 	wait_queue_head_t sd_quota_wait;
787 	struct list_head sd_trunc_list;
788 	spinlock_t sd_trunc_lock;
789 
790 	unsigned int sd_quota_slots;
791 	unsigned long *sd_quota_bitmap;
792 	spinlock_t sd_bitmap_lock;
793 
794 	u64 sd_quota_sync_gen;
795 
796 	/* Log stuff */
797 
798 	struct address_space sd_aspace;
799 
800 	spinlock_t sd_log_lock;
801 
802 	struct gfs2_trans *sd_log_tr;
803 	unsigned int sd_log_blks_reserved;
804 
805 	atomic_t sd_log_pinned;
806 	unsigned int sd_log_num_revoke;
807 
808 	struct list_head sd_log_revokes;
809 	struct list_head sd_log_ordered;
810 	spinlock_t sd_ordered_lock;
811 
812 	atomic_t sd_log_thresh1;
813 	atomic_t sd_log_thresh2;
814 	atomic_t sd_log_blks_free;
815 	atomic_t sd_log_blks_needed;
816 	atomic_t sd_log_revokes_available;
817 	wait_queue_head_t sd_log_waitq;
818 	wait_queue_head_t sd_logd_waitq;
819 
820 	u64 sd_log_sequence;
821 	int sd_log_idle;
822 
823 	struct rw_semaphore sd_log_flush_lock;
824 	atomic_t sd_log_in_flight;
825 	wait_queue_head_t sd_log_flush_wait;
826 	int sd_log_error; /* First log error */
827 	wait_queue_head_t sd_withdraw_wait;
828 
829 	unsigned int sd_log_tail;
830 	unsigned int sd_log_flush_tail;
831 	unsigned int sd_log_head;
832 	unsigned int sd_log_flush_head;
833 
834 	spinlock_t sd_ail_lock;
835 	struct list_head sd_ail1_list;
836 	struct list_head sd_ail2_list;
837 
838 	/* For quiescing the filesystem */
839 	struct gfs2_holder sd_freeze_gh;
840 	atomic_t sd_freeze_state;
841 	struct mutex sd_freeze_mutex;
842 
843 	char sd_fsname[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];
844 	char sd_table_name[GFS2_FSNAME_LEN];
845 	char sd_proto_name[GFS2_FSNAME_LEN];
846 
847 	/* Debugging crud */
848 
849 	unsigned long sd_last_warning;
850 	struct dentry *debugfs_dir;    /* debugfs directory */
851 	unsigned long sd_glock_dqs_held;
852 };
853 
gfs2_glstats_inc(struct gfs2_glock * gl,int which)854 static inline void gfs2_glstats_inc(struct gfs2_glock *gl, int which)
855 {
856 	gl->gl_stats.stats[which]++;
857 }
858 
gfs2_sbstats_inc(const struct gfs2_glock * gl,int which)859 static inline void gfs2_sbstats_inc(const struct gfs2_glock *gl, int which)
860 {
861 	const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
862 	preempt_disable();
863 	this_cpu_ptr(sdp->sd_lkstats)->lkstats[gl->gl_name.ln_type].stats[which]++;
864 	preempt_enable();
865 }
866 
867 extern struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl);
868 
gfs2_max_stuffed_size(const struct gfs2_inode * ip)869 static inline unsigned gfs2_max_stuffed_size(const struct gfs2_inode *ip)
870 {
871 	return GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
872 }
873 
874 #endif /* __INCORE_DOT_H__ */
875 
876