summaryrefslogtreecommitdiffstats
path: root/fs/gfs2/incore.h
blob: a1ec7c20e498220c75809e14bae2c2d63709b9a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __INCORE_DOT_H__
#define __INCORE_DOT_H__

#include <linux/fs.h>
#include <linux/kobject.h>
#include <linux/workqueue.h>
#include <linux/dlm.h>
#include <linux/buffer_head.h>
#include <linux/rcupdate.h>
#include <linux/rculist_bl.h>
#include <linux/completion.h>
#include <linux/rbtree.h>
#include <linux/ktime.h>
#include <linux/percpu.h>
#include <linux/lockref.h>

#define DIO_WAIT	0x00000010
#define DIO_METADATA	0x00000020

struct gfs2_log_operations;
struct gfs2_bufdata;
struct gfs2_holder;
struct gfs2_glock;
struct gfs2_quota_data;
struct gfs2_trans;
struct gfs2_jdesc;
struct gfs2_sbd;
struct lm_lockops;

typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);

struct gfs2_log_header_host {
	u64 lh_sequence;	/* Sequence number of this transaction */
	u32 lh_flags;		/* GFS2_LOG_HEAD_... */
	u32 lh_tail;		/* Block number of log tail */
	u32 lh_blkno;
	u32 lh_hash;
};

/*
 * Structure of operations that are associated with each
 * type of element in the log.
 */

struct gfs2_log_operations {
	void (*lo_before_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
	void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
	void (*lo_before_scan) (struct gfs2_jdesc *jd,
				struct gfs2_log_header_host *head, int pass);
	int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
				 struct gfs2_log_descriptor *ld, __be64 *ptr,
				 int pass);
	void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
	const char *lo_name;
};

#define GBF_FULL 1

struct gfs2_bitmap {
	struct buffer_head *bi_bh;
	char *bi_clone;
	unsigned long bi_flags;
	u32 bi_offset;
	u32 bi_start;
	u32 bi_len;
	u32 bi_blocks;
};

struct gfs2_rgrpd {
	struct rb_node rd_node;		/* Link with superblock */
	struct gfs2_glock *rd_gl;	/* Glock for this rgrp */
	u64 rd_addr;			/* grp block disk address */
	u64 rd_data0;			/* first data location */
	u32 rd_length;			/* length of rgrp header in fs blocks */
	u32 rd_data;			/* num of data blocks in rgrp */
	u32 rd_bitbytes;		/* number of bytes in data bitmaps */
	u32 rd_free;
	u32 rd_reserved;                /* number of blocks reserved */
	u32 rd_free_clone;
	u32 rd_dinodes;
	u64 rd_igeneration;
	struct gfs2_bitmap *rd_bits;
	struct gfs2_sbd *rd_sbd;
	struct gfs2_rgrp_lvb *rd_rgl;
	u32 rd_last_alloc;
	u32 rd_flags;
	u32 rd_extfail_pt;		/* extent failure point */
#define GFS2_RDF_CHECK		0x10000000 /* check for unlinked inodes */
#define GFS2_RDF_UPTODATE	0x20000000 /* rg is up to date */
#define GFS2_RDF_ERROR		0x40000000 /* error in rg */
#define GFS2_RDF_PREFERRED	0x80000000 /* This rgrp is preferred */
#define GFS2_RDF_MASK		0xf0000000 /* mask for internal flags */
	spinlock_t rd_rsspin;           /* protects reservation related vars */
	struct rb_root rd_rstree;       /* multi-block reservation tree */
};

struct gfs2_rbm {
	struct gfs2_rgrpd *rgd;
	u32 offset;		/* The offset is bitmap relative */
	int bii;		/* Bitmap index */
};

static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
{
	return rbm->rgd->rd_bits + rbm->bii;
}

static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
{
	return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
		rbm->offset;
}

static inline bool gfs2_rbm_eq(const struct gfs2_rbm *rbm1,
			       const struct gfs2_rbm *rbm2)
{
	return (rbm1->rgd == rbm2->rgd) && (rbm1->bii == rbm2->bii) &&
	       (rbm1->offset == rbm2->offset);
}

enum gfs2_state_bits {
	BH_Pinned = BH_PrivateStart,
	BH_Escaped = BH_PrivateStart + 1,
	BH_Zeronew = BH_PrivateStart + 2,
};

BUFFER_FNS(Pinned, pinned)
TAS_BUFFER_FNS(Pinned, pinned)
BUFFER_FNS(Escaped, escaped)
TAS_BUFFER_FNS(Escaped, escaped)
BUFFER_FNS(Zeronew, zeronew)
TAS_BUFFER_FNS(Zeronew, zeronew)

struct gfs2_bufdata {
	struct buffer_head *bd_bh;
	struct gfs2_glock *bd_gl;
	u64 bd_blkno;

	struct list_head bd_list;
	const struct gfs2_log_operations *bd_ops;

	struct gfs2_trans *bd_tr;
	struct list_head bd_ail_st_list;
	struct list_head bd_ail_gl_list;
};

/*
 * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
 * prefix of lock_dlm_ gets awkward.
 */

#define GDLM_STRNAME_BYTES	25
#define GDLM_LVB_SIZE		32

/*
 * ls_recover_flags:
 *
 * DFL_BLOCK_LOCKS: dlm is in recovery and will grant locks that had been
 * held by failed nodes whose journals need recovery.  Those locks should
 * only be used for journal recovery until the journal recovery is done.
 * This is set by the dlm recover_prep callback and cleared by the
 * gfs2_control thread when journal recovery is complete.  To avoid
 * races between recover_prep setting and gfs2_control clearing, recover_spin
 * is held while changing this bit and reading/writing recover_block
 * and recover_start.
 *
 * DFL_NO_DLM_OPS: dlm lockspace ops/callbacks are not being used.
 *
 * DFL_FIRST_MOUNT: this node is the first to mount this fs and is doing
 * recovery of all journals before allowing other nodes to mount the fs.
 * This is cleared when FIRST_MOUNT_DONE is set.
 *
 * DFL_FIRST_MOUNT_DONE: this node was the first mounter, and has finished
 * recovery of all journals, and now allows other nodes to mount the fs.
 *
 * DFL_MOUNT_DONE: gdlm_mount has completed successfully and cleared
 * BLOCK_LOCKS for the first time.  The gfs2_control thread should now
 * control clearing BLOCK_LOCKS for further recoveries.
 *
 * DFL_UNMOUNT: gdlm_unmount sets to keep sdp off gfs2_control_wq.
 *
 * DFL_DLM_RECOVERY: set while dlm is in recovery, between recover_prep()
 * and recover_done(), i.e. set while recover_block == recover_start.
 */

enum {
	DFL_BLOCK_LOCKS		= 0,
	DFL_NO_DLM_OPS		= 1,
	DFL_FIRST_MOUNT		= 2,
	DFL_FIRST_MOUNT_DONE	= 3,
	DFL_MOUNT_DONE		= 4,
	DFL_UNMOUNT		= 5,
	DFL_DLM_RECOVERY	= 6,
};

struct lm_lockname {
	u64 ln_number;
	unsigned int ln_type;
};

#define lm_name_equal(name1, name2) \
        (((name1)->ln_number == (name2)->ln_number) && \
         ((name1)->ln_type == (name2)->ln_type))


struct gfs2_glock_operations {
	void (*go_sync) (struct gfs2_glock *gl);
	int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
	void (*go_inval) (struct gfs2_glock *gl, int flags);
	int (*go_demote_ok) (const struct gfs2_glock *gl);
	int (*go_lock) (struct gfs2_holder *gh);
	void (*go_unlock) (struct gfs2_holder *gh);
	void (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
	void (*go_callback)(struct gfs2_glock *gl, bool remote);
	const int go_type;
	const unsigned long go_flags;
#define GLOF_ASPACE 1
#define GLOF_LVB    2
#define GLOF_LRU    4
};

enum {
	GFS2_LKS_SRTT = 0,	/* Non blocking smoothed round trip time */
	GFS2_LKS_SRTTVAR = 1,	/* Non blocking smoothed variance */
	GFS2_LKS_SRTTB = 2,	/* Blocking smoothed round trip time */
	GFS2_LKS_SRTTVARB = 3,	/* Blocking smoothed variance */
	GFS2_LKS_SIRT = 4,	/* Smoothed Inter-request time */
	GFS2_LKS_SIRTVAR = 5,	/* Smoothed Inter-request variance */
	GFS2_LKS_DCOUNT = 6,	/* Count of dlm requests */
	GFS2_LKS_QCOUNT = 7,	/* Count of gfs2_holder queues */
	GFS2_NR_LKSTATS
};

struct gfs2_lkstats {
	s64 stats[GFS2_NR_LKSTATS];
};

enum {
	/* States */
	HIF_HOLDER		= 6,  /* Set for gh that "holds" the glock */
	HIF_FIRST		= 7,
	HIF_WAIT		= 10,
};

struct gfs2_holder {
	struct list_head gh_list;

	struct gfs2_glock *gh_gl;
	struct pid *gh_owner_pid;
	unsigned int gh_state;
	unsigned gh_flags;

	int gh_error;
	unsigned long gh_iflags; /* HIF_... */
	unsigned long gh_ip;
};

/* Number of quota types we support */
#define GFS2_MAXQUOTAS 2

/* Resource group multi-block reservation, in order of appearance:

   Step 1. Function prepares to write, allocates a mb, sets the size hint.
   Step 2. User calls inplace_reserve to target an rgrp, sets the rgrp info
   Step 3. Function get_local_rgrp locks the rgrp, determines which bits to use
   Step 4. Bits are assigned from the rgrp based on either the reservation
           or wherever it can.
*/

struct gfs2_blkreserv {
	/* components used during write (step 1): */
	atomic_t rs_sizehint;         /* hint of the write size */

	struct gfs2_holder rs_rgd_gh; /* Filled in by get_local_rgrp */
	struct rb_node rs_node;       /* link to other block reservations */
	struct gfs2_rbm rs_rbm;       /* Start of reservation */
	u32 rs_free;                  /* how many blocks are still free */
	u64 rs_inum;                  /* Inode number for reservation */

	/* ancillary quota stuff */
	struct gfs2_quota_data *rs_qa_qd[2 * GFS2_MAXQUOTAS];
	struct gfs2_holder rs_qa_qd_ghs[2 * GFS2_MAXQUOTAS];
	unsigned int rs_qa_qd_num;
};

/*
 * Allocation parameters
 * @target: The number of blocks we'd ideally like to allocate
 * @aflags: The flags (e.g. Orlov flag)
 *
 * The intent is to gradually expand this structure over time in
 * order to give more information, e.g. alignment, min extent size
 * to the allocation code.
 */
struct gfs2_alloc_parms {
	u64 target;
	u32 min_target;
	u32 aflags;
	u64 allowed;
};

enum {
	GLF_LOCK			= 1,
	GLF_DEMOTE			= 3,
	GLF_PENDING_DEMOTE		= 4,
	GLF_DEMOTE_IN_PROGRESS		= 5,
	GLF_DIRTY			= 6,
	GLF_LFLUSH			= 7,
	GLF_INVALIDATE_IN_PROGRESS	= 8,
	GLF_REPLY_PENDING		= 9,
	GLF_INITIAL			= 10,
	GLF_FROZEN			= 11,
	GLF_QUEUED			= 12,
	GLF_LRU				= 13,
	GLF_OBJECT			= 14, /* Used only for tracing */
	GLF_BLOCKING			= 15,
};

struct gfs2_glock {
	struct hlist_bl_node gl_list;
	struct gfs2_sbd *gl_sbd;
	unsigned long gl_flags;		/* GLF_... */
	struct lm_lockname gl_name;

	struct lockref gl_lockref;
#define gl_spin gl_lockref.lock

	/* State fields protected by gl_spin */
	unsigned int gl_state:2,	/* Current state */
		     gl_target:2,	/* Target state */
		     gl_demote_state:2,	/* State requested by remote node */
		     gl_req:2,		/* State in last dlm request */
		     gl_reply:8;	/* Last reply from the dlm */

	unsigned int gl_hash;
	unsigned long gl_demote_time; /* time of first demote request */
	long gl_hold_time;
	struct list_head gl_holders;

	const struct gfs2_glock_operations *gl_ops;
	ktime_t gl_dstamp;
	struct gfs2_lkstats gl_stats;
	struct dlm_lksb gl_lksb;
	unsigned long gl_tchange;
	void *gl_object;

	struct list_head gl_lru;
	struct list_head gl_ail_list;
	atomic_t gl_ail_count;
	atomic_t gl_revokes;
	struct delayed_work gl_work;
	union {
		/* For inode and iopen glocks only */
		struct work_struct gl_delete;
		/* For rgrp glocks only */
		struct {
			loff_t start;
			loff_t end;
		} gl_vm;
	};
	struct rcu_head gl_rcu;
};

#define GFS2_MIN_LVB_SIZE 32	/* Min size of LVB that gfs2 supports */

enum {
	GIF_INVALID		= 0,
	GIF_QD_LOCKED		= 1,
	GIF_ALLOC_FAILED	= 2,
	GIF_SW_PAGED		= 3,
	GIF_ORDERED		= 4,
	GIF_FREE_VFS_INODE      = 5,
};

struct gfs2_inode {
	struct inode i_inode;
	u64 i_no_addr;
	u64 i_no_formal_ino;
	u64 i_generation;
	u64 i_eattr;
	unsigned long i_flags;		/* GIF_... */
	struct gfs2_glock *i_gl; /* Move into i_gh? */
	struct gfs2_holder i_iopen_gh;
	struct gfs2_holder i_gh; /* for prepare/commit_write only */
	struct gfs2_blkreserv *i_res; /* rgrp multi-block reservation */
	struct gfs2_rgrpd *i_rgd;
	u64 i_goal;	/* goal block for allocations */
	struct rw_semaphore i_rw_mutex;
	struct list_head i_ordered;
	struct list_head i_trunc_list;
	__be64 *i_hash_cache;
	u32 i_entries;
	u32 i_diskflags;
	u8 i_height;
	u8 i_depth;
};

/*
 * Since i_inode is the first element of struct gfs2_inode,
 * this is effectively a cast.
 */
static inline struct gfs2_inode *GFS2_I(struct inode *inode)
{
	return container_of(inode, struct gfs2_inode, i_inode);
}

static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
{
	return inode->i_sb->s_fs_info;
}

struct gfs2_file {
	struct mutex f_fl_mutex;
	struct gfs2_holder f_fl_gh;
};

struct gfs2_revoke_replay {
	struct list_head rr_list;
	u64 rr_blkno;
	unsigned int rr_where;
};

enum {
	QDF_CHANGE		= 1,
	QDF_LOCKED		= 2,
	QDF_REFRESH		= 3,
	QDF_QMSG_QUIET          = 4,
};

struct gfs2_quota_data {
	struct hlist_bl_node qd_hlist;
	struct list_head qd_list;
	struct kqid qd_id;
	struct gfs2_sbd *qd_sbd;
	struct lockref qd_lockref;
	struct list_head qd_lru;
	unsigned qd_hash;

	unsigned long qd_flags;		/* QDF_... */

	s64 qd_change;
	s64 qd_change_sync;

	unsigned int qd_slot;
	unsigned int qd_slot_count;

	struct buffer_head *qd_bh;
	struct gfs2_quota_change *qd_bh_qc;
	unsigned int qd_bh_count;

	struct gfs2_glock *qd_gl;
	struct gfs2_quota_lvb qd_qb;

	u64 qd_sync_gen;
	unsigned long qd_last_warn;
	struct rcu_head qd_rcu;
};

struct gfs2_trans {
	unsigned long tr_ip;

	unsigned int tr_blocks;
	unsigned int tr_revokes;
	unsigned int tr_reserved;
	unsigned int tr_touched:1;
	unsigned int tr_attached:1;
	unsigned int tr_alloced:1;

	unsigned int tr_num_buf_new;
	unsigned int tr_num_databuf_new;
	unsigned int tr_num_buf_rm;
	unsigned int tr_num_databuf_rm;
	unsigned int tr_num_revoke;
	unsigned int tr_num_revoke_rm;

	struct list_head tr_list;
	struct list_head tr_databuf;
	struct list_head tr_buf;

	unsigned int tr_first;
	struct list_head tr_ail1_list;
	struct list_head tr_ail2_list;
};

struct gfs2_journal_extent {
	struct list_head list;

	unsigned int lblock; /* First logical block */
	u64 dblock; /* First disk block */
	u64 blocks;
};

struct gfs2_jdesc {
	struct list_head jd_list;
	struct list_head extent_list;
	unsigned int nr_extents;
	struct work_struct jd_work;
	struct inode *jd_inode;
	unsigned long jd_flags;
#define JDF_RECOVERY 1
	unsigned int jd_jid;
	unsigned int jd_blocks;
	int jd_recover_error;
	/* Replay stuff */

	unsigned int jd_found_blocks;
	unsigned int jd_found_revokes;
	unsigned int jd_replayed_blocks;

	struct list_head jd_revoke_list;
	unsigned int jd_replay_tail;

};

struct gfs2_statfs_change_host {
	s64 sc_total;
	s64 sc_free;
	s64 sc_dinodes;
};

#define GFS2_QUOTA_DEFAULT	GFS2_QUOTA_OFF
#define GFS2_QUOTA_OFF		0
#define GFS2_QUOTA_ACCOUNT	1
#define GFS2_QUOTA_ON		2

#define GFS2_DATA_DEFAULT	GFS2_DATA_ORDERED
#define GFS2_DATA_WRITEBACK	1
#define GFS2_DATA_ORDERED	2

#define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
#define GFS2_ERRORS_WITHDRAW    0
#define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
#define GFS2_ERRORS_RO          2 /* place holder for future feature */
#define GFS2_ERRORS_PANIC       3

struct gfs2_args {
	char ar_lockproto[GFS2_LOCKNAME_LEN];	/* Name of the Lock Protocol */
	char ar_locktable[GFS2_LOCKNAME_LEN];	/* Name of the Lock Table */
	char ar_hostdata[GFS2_LOCKNAME_LEN];	/* Host specific data */
	unsigned int ar_spectator:1;		/* Don't get a journal */
	unsigned int ar_localflocks:1;		/* Let the VFS do flock|fcntl */
	unsigned int ar_debug:1;		/* Oops on errors */
	unsigned int ar_posix_acl:1;		/* Enable posix acls */
	unsigned int ar_quota:2;		/* off/account/on */
	unsigned int ar_suiddir:1;		/* suiddir support */
	unsigned int ar_data:2;			/* ordered/writeback */
	unsigned int ar_meta:1;			/* mount metafs */
	unsigned int ar_discard:1;		/* discard requests */
	unsigned int ar_errors:2;               /* errors=withdraw | panic */
	unsigned int ar_nobarrier:1;            /* do not send barriers */
	unsigned int ar_rgrplvb:1;		/* use lvbs for rgrp info */
	int ar_commit;				/* Commit interval */
	int ar_statfs_quantum;			/* The fast statfs interval */
	int ar_quota_quantum;			/* The quota interval */
	int ar_statfs_percent;			/* The % change to force sync */
};

struct gfs2_tune {
	spinlock_t gt_spin;

	unsigned int gt_logd_secs;

	unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
	unsigned int gt_quota_scale_num; /* Numerator */
	unsigned int gt_quota_scale_den; /* Denominator */
	unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
	unsigned int gt_new_files_jdata;
	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
	unsigned int gt_complain_secs;
	unsigned int gt_statfs_quantum;
	unsigned int gt_statfs_slow;
};

enum {
	SDF_JOURNAL_CHECKED	= 0,
	SDF_JOURNAL_LIVE	= 1,
	SDF_SHUTDOWN		= 2,
	SDF_NOBARRIERS		= 3,
	SDF_NORECOVERY		= 4,
	SDF_DEMOTE		= 5,
	SDF_NOJOURNALID		= 6,
	SDF_RORECOVERY		= 7, /* read only recovery */
	SDF_SKIP_DLM_UNLOCK	= 8,
};

enum gfs2_freeze_state {
	SFS_UNFROZEN		= 0,
	SFS_STARTING_FREEZE	= 1,
	SFS_FROZEN		= 2,
};

#define GFS2_FSNAME_LEN		256

struct gfs2_inum_host {
	u64 no_formal_ino;
	u64 no_addr;
};

struct gfs2_sb_host {
	u32 sb_magic;
	u32 sb_type;
	u32 sb_format;

	u32 sb_fs_format;
	u32 sb_multihost_format;
	u32 sb_bsize;
	u32 sb_bsize_shift;

	struct gfs2_inum_host sb_master_dir;
	struct gfs2_inum_host sb_root_dir;

	char sb_lockproto[GFS2_LOCKNAME_LEN];
	char sb_locktable[GFS2_LOCKNAME_LEN];
};

/*
 * lm_mount() return values
 *
 * ls_jid - the journal ID this node should use
 * ls_first - this node is the first to mount the file system
 * ls_lockspace - lock module's context for this file system
 * ls_ops - lock module's functions
 */

struct lm_lockstruct {
	int ls_jid;
	unsigned int ls_first;
	const struct lm_lockops *ls_ops;
	dlm_lockspace_t *ls_dlm;

	int ls_recover_jid_done;   /* These two are deprecated, */
	int ls_recover_jid_status; /* used previously by gfs_controld */

	struct dlm_lksb ls_mounted_lksb; /* mounted_lock */
	struct dlm_lksb ls_control_lksb; /* control_lock */
	char ls_control_lvb[GDLM_LVB_SIZE]; /* control_lock lvb */
	struct completion ls_sync_wait; /* {control,mounted}_{lock,unlock} */
	char *ls_lvb_bits;

	spinlock_t ls_recover_spin; /* protects following fields */
	unsigned long ls_recover_flags; /* DFL_ */
	uint32_t ls_recover_mount; /* gen in first recover_done cb */
	uint32_t ls_recover_start; /* gen in last recover_done cb */
	uint32_t ls_recover_block; /* copy recover_start in last recover_prep */
	uint32_t ls_recover_size; /* size of recover_submit, recover_result */
	uint32_t *ls_recover_submit; /* gen in last recover_slot cb per jid */
	uint32_t *ls_recover_result; /* result of last jid recovery */
};

struct gfs2_pcpu_lkstats {
	/* One struct for each glock type */
	struct gfs2_lkstats lkstats[10];
};

struct gfs2_sbd {
	struct super_block *sd_vfs;
	struct gfs2_pcpu_lkstats __percpu *sd_lkstats;
	struct kobject sd_kobj;
	unsigned long sd_flags;	/* SDF_... */
	struct gfs2_sb_host sd_sb;

	/* Constants computed on mount */

	u32 sd_fsb2bb;
	u32 sd_fsb2bb_shift;
	u32 sd_diptrs;	/* Number of pointers in a dinode */
	u32 sd_inptrs;	/* Number of pointers in a indirect block */
	u32 sd_jbsize;	/* Size of a journaled data block */
	u32 sd_hash_bsize;	/* sizeof(exhash block) */
	u32 sd_hash_bsize_shift;
	u32 sd_hash_ptrs;	/* Number of pointers in a hash block */
	u32 sd_qc_per_block;
	u32 sd_blocks_per_bitmap;
	u32 sd_max_dirres;	/* Max blocks needed to add a directory entry */
	u32 sd_max_height;	/* Max height of a file's metadata tree */
	u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
	u32 sd_max_jheight; /* Max height of journaled file's meta tree */
	u64 sd_jheightsize[GFS2_MAX_META_HEIGHT + 1];

	struct gfs2_args sd_args;	/* Mount arguments */
	struct gfs2_tune sd_tune;	/* Filesystem tuning structure */

	/* Lock Stuff */

	struct lm_lockstruct sd_lockstruct;
	struct gfs2_holder sd_live_gh;
	struct gfs2_glock *sd_rename_gl;
	struct gfs2_glock *sd_freeze_gl;
	struct work_struct sd_freeze_work;
	wait_queue_head_t sd_glock_wait;
	atomic_t sd_glock_disposal;
	struct completion sd_locking_init;
	struct completion sd_wdack;
	struct delayed_work sd_control_work;

	/* Inode Stuff */

	struct dentry *sd_master_dir;
	struct dentry *sd_root_dir;

	struct inode *sd_jindex;
	struct inode *sd_statfs_inode;
	struct inode *sd_sc_inode;
	struct inode *sd_qc_inode;
	struct inode *sd_rindex;
	struct inode *sd_quota_inode;

	/* StatFS stuff */

	spinlock_t sd_statfs_spin;
	struct gfs2_statfs_change_host sd_statfs_master;
	struct gfs2_statfs_change_host sd_statfs_local;
	int sd_statfs_force_sync;

	/* Resource group stuff */

	int sd_rindex_uptodate;
	spinlock_t sd_rindex_spin;
	struct rb_root sd_rindex_tree;
	unsigned int sd_rgrps;
	unsigned int sd_max_rg_data;

	/* Journal index stuff */

	struct list_head sd_jindex_list;
	spinlock_t sd_jindex_spin;
	struct mutex sd_jindex_mutex;
	unsigned int sd_journals;

	struct gfs2_jdesc *sd_jdesc;
	struct gfs2_holder sd_journal_gh;
	struct gfs2_holder sd_jinode_gh;

	struct gfs2_holder sd_sc_gh;
	struct gfs2_holder sd_qc_gh;

	struct completion sd_journal_ready;

	/* Daemon stuff */

	struct task_struct *sd_logd_process;
	struct task_struct *sd_quotad_process;

	/* Quota stuff */

	struct list_head sd_quota_list;
	atomic_t sd_quota_count;
	struct mutex sd_quota_mutex;
	struct mutex sd_quota_sync_mutex;
	wait_queue_head_t sd_quota_wait;
	struct list_head sd_trunc_list;
	spinlock_t sd_trunc_lock;

	unsigned int sd_quota_slots;
	unsigned long *sd_quota_bitmap;
	spinlock_t sd_bitmap_lock;

	u64 sd_quota_sync_gen;

	/* Log stuff */

	struct address_space sd_aspace;

	spinlock_t sd_log_lock;

	struct gfs2_trans *sd_log_tr;
	unsigned int sd_log_blks_reserved;
	int sd_log_commited_revoke;

	atomic_t sd_log_pinned;
	unsigned int sd_log_num_revoke;

	struct list_head sd_log_le_revoke;
	struct list_head sd_log_le_ordered;
	spinlock_t sd_ordered_lock;

	atomic_t sd_log_thresh1;
	atomic_t sd_log_thresh2;
	atomic_t sd_log_blks_free;
	wait_queue_head_t sd_log_waitq;
	wait_queue_head_t sd_logd_waitq;

	u64 sd_log_sequence;
	unsigned int sd_log_head;
	unsigned int sd_log_tail;
	int sd_log_idle;

	struct rw_semaphore sd_log_flush_lock;
	atomic_t sd_log_in_flight;
	struct bio *sd_log_bio;
	wait_queue_head_t sd_log_flush_wait;
	int sd_log_error;

	atomic_t sd_reserving_log;
	wait_queue_head_t sd_reserving_log_wait;

	unsigned int sd_log_flush_head;
	u64 sd_log_flush_wrapped;

	spinlock_t sd_ail_lock;
	struct list_head sd_ail1_list;
	struct list_head sd_ail2_list;

	/* For quiescing the filesystem */
	struct gfs2_holder sd_freeze_gh;
	atomic_t sd_freeze_state;
	struct mutex sd_freeze_mutex;

	char sd_fsname[GFS2_FSNAME_LEN];
	char sd_table_name[GFS2_FSNAME_LEN];
	char sd_proto_name[GFS2_FSNAME_LEN];

	/* Debugging crud */

	unsigned long sd_last_warning;
	struct dentry *debugfs_dir;    /* debugfs directory */
	struct dentry *debugfs_dentry_glocks;
	struct dentry *debugfs_dentry_glstats;
	struct dentry *debugfs_dentry_sbstats;
};

static inline void gfs2_glstats_inc(struct gfs2_glock *gl, int which)
{
	gl->gl_stats.stats[which]++;
}

static inline void gfs2_sbstats_inc(const struct gfs2_glock *gl, int which)
{
	const struct gfs2_sbd *sdp = gl->gl_sbd;
	preempt_disable();
	this_cpu_ptr(sdp->sd_lkstats)->lkstats[gl->gl_name.ln_type].stats[which]++;
	preempt_enable();
}

#endif /* __INCORE_DOT_H__ */

OpenPOWER on IntegriCloud