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TOMOYO Linux Cross Reference
Linux/fs/dlm/dlm_internal.h

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  1 /******************************************************************************
  2 *******************************************************************************
  3 **
  4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
  5 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
  6 **
  7 **  This copyrighted material is made available to anyone wishing to use,
  8 **  modify, copy, or redistribute it subject to the terms and conditions
  9 **  of the GNU General Public License v.2.
 10 **
 11 *******************************************************************************
 12 ******************************************************************************/
 13 
 14 #ifndef __DLM_INTERNAL_DOT_H__
 15 #define __DLM_INTERNAL_DOT_H__
 16 
 17 /*
 18  * This is the main header file to be included in each DLM source file.
 19  */
 20 
 21 #include <linux/slab.h>
 22 #include <linux/sched.h>
 23 #include <linux/types.h>
 24 #include <linux/ctype.h>
 25 #include <linux/spinlock.h>
 26 #include <linux/vmalloc.h>
 27 #include <linux/list.h>
 28 #include <linux/errno.h>
 29 #include <linux/random.h>
 30 #include <linux/delay.h>
 31 #include <linux/socket.h>
 32 #include <linux/kthread.h>
 33 #include <linux/kobject.h>
 34 #include <linux/kref.h>
 35 #include <linux/kernel.h>
 36 #include <linux/jhash.h>
 37 #include <linux/miscdevice.h>
 38 #include <linux/mutex.h>
 39 #include <linux/idr.h>
 40 #include <linux/ratelimit.h>
 41 #include <linux/uaccess.h>
 42 
 43 #include <linux/dlm.h>
 44 #include "config.h"
 45 
 46 /* Size of the temp buffer midcomms allocates on the stack.
 47    We try to make this large enough so most messages fit.
 48    FIXME: should sctp make this unnecessary? */
 49 
 50 #define DLM_INBUF_LEN           148
 51 
 52 struct dlm_ls;
 53 struct dlm_lkb;
 54 struct dlm_rsb;
 55 struct dlm_member;
 56 struct dlm_rsbtable;
 57 struct dlm_recover;
 58 struct dlm_header;
 59 struct dlm_message;
 60 struct dlm_rcom;
 61 struct dlm_mhandle;
 62 
 63 #define log_print(fmt, args...) \
 64         printk(KERN_ERR "dlm: "fmt"\n" , ##args)
 65 #define log_error(ls, fmt, args...) \
 66         printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
 67 
 68 #define log_rinfo(ls, fmt, args...) \
 69 do { \
 70         if (dlm_config.ci_log_info) \
 71                 printk(KERN_INFO "dlm: %s: " fmt "\n", \
 72                         (ls)->ls_name, ##args); \
 73         else if (dlm_config.ci_log_debug) \
 74                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
 75                        (ls)->ls_name , ##args); \
 76 } while (0)
 77 
 78 #define log_debug(ls, fmt, args...) \
 79 do { \
 80         if (dlm_config.ci_log_debug) \
 81                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
 82                        (ls)->ls_name , ##args); \
 83 } while (0)
 84 
 85 #define log_limit(ls, fmt, args...) \
 86 do { \
 87         if (dlm_config.ci_log_debug) \
 88                 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
 89                         (ls)->ls_name , ##args); \
 90 } while (0)
 91 
 92 #define DLM_ASSERT(x, do) \
 93 { \
 94   if (!(x)) \
 95   { \
 96     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
 97                "DLM:  assertion:  \"%s\"\n" \
 98                "DLM:  time = %lu\n", \
 99                __LINE__, __FILE__, #x, jiffies); \
100     {do} \
101     printk("\n"); \
102     BUG(); \
103     panic("DLM:  Record message above and reboot.\n"); \
104   } \
105 }
106 
107 
108 #define DLM_RTF_SHRINK          0x00000001
109 
110 struct dlm_rsbtable {
111         struct rb_root          keep;
112         struct rb_root          toss;
113         spinlock_t              lock;
114         uint32_t                flags;
115 };
116 
117 
118 /*
119  * Lockspace member (per node in a ls)
120  */
121 
122 struct dlm_member {
123         struct list_head        list;
124         int                     nodeid;
125         int                     weight;
126         int                     slot;
127         int                     slot_prev;
128         int                     comm_seq;
129         uint32_t                generation;
130 };
131 
132 /*
133  * Save and manage recovery state for a lockspace.
134  */
135 
136 struct dlm_recover {
137         struct list_head        list;
138         struct dlm_config_node  *nodes;
139         int                     nodes_count;
140         uint64_t                seq;
141 };
142 
143 /*
144  * Pass input args to second stage locking function.
145  */
146 
147 struct dlm_args {
148         uint32_t                flags;
149         void                    (*astfn) (void *astparam);
150         void                    *astparam;
151         void                    (*bastfn) (void *astparam, int mode);
152         int                     mode;
153         struct dlm_lksb         *lksb;
154         unsigned long           timeout;
155 };
156 
157 
158 /*
159  * Lock block
160  *
161  * A lock can be one of three types:
162  *
163  * local copy      lock is mastered locally
164  *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
165  * process copy    lock is mastered on a remote node
166  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
167  * master copy     master node's copy of a lock owned by remote node
168  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
169  *
170  * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
171  * dlm_unlock.  The dlm does not modify these or use any private flags in
172  * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
173  * are sent as-is to the remote master when the lock is remote.
174  *
175  * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
176  * Some internal flags are shared between the master and process nodes;
177  * these shared flags are kept in the lower two bytes.  One of these
178  * flags set on the master copy will be propagated to the process copy
179  * and v.v.  Other internal flags are private to the master or process
180  * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
181  *
182  * lkb_sbflags: status block flags.  These flags are copied directly into
183  * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
184  * ast.  All defined in dlm.h with DLM_SBF_ prefix.
185  *
186  * lkb_status: the lock status indicates which rsb queue the lock is
187  * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
188  *
189  * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
190  * reply is needed.  Only set when the lkb is on the lockspace waiters
191  * list awaiting a reply from a remote node.
192  *
193  * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
194  * is a master copy, nodeid specifies the remote lock holder, when the
195  * lkb is a process copy, the nodeid specifies the lock master.
196  */
197 
198 /* lkb_status */
199 
200 #define DLM_LKSTS_WAITING       1
201 #define DLM_LKSTS_GRANTED       2
202 #define DLM_LKSTS_CONVERT       3
203 
204 /* lkb_flags */
205 
206 #define DLM_IFL_MSTCPY          0x00010000
207 #define DLM_IFL_RESEND          0x00020000
208 #define DLM_IFL_DEAD            0x00040000
209 #define DLM_IFL_OVERLAP_UNLOCK  0x00080000
210 #define DLM_IFL_OVERLAP_CANCEL  0x00100000
211 #define DLM_IFL_ENDOFLIFE       0x00200000
212 #define DLM_IFL_WATCH_TIMEWARN  0x00400000
213 #define DLM_IFL_TIMEOUT_CANCEL  0x00800000
214 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
215 #define DLM_IFL_STUB_MS         0x02000000 /* magic number for m_flags */
216 #define DLM_IFL_USER            0x00000001
217 #define DLM_IFL_ORPHAN          0x00000002
218 
219 #define DLM_CALLBACKS_SIZE      6
220 
221 #define DLM_CB_CAST             0x00000001
222 #define DLM_CB_BAST             0x00000002
223 #define DLM_CB_SKIP             0x00000004
224 
225 struct dlm_callback {
226         uint64_t                seq;
227         uint32_t                flags;          /* DLM_CBF_ */
228         int                     sb_status;      /* copy to lksb status */
229         uint8_t                 sb_flags;       /* copy to lksb flags */
230         int8_t                  mode; /* rq mode of bast, gr mode of cast */
231 };
232 
233 struct dlm_lkb {
234         struct dlm_rsb          *lkb_resource;  /* the rsb */
235         struct kref             lkb_ref;
236         int                     lkb_nodeid;     /* copied from rsb */
237         int                     lkb_ownpid;     /* pid of lock owner */
238         uint32_t                lkb_id;         /* our lock ID */
239         uint32_t                lkb_remid;      /* lock ID on remote partner */
240         uint32_t                lkb_exflags;    /* external flags from caller */
241         uint32_t                lkb_sbflags;    /* lksb flags */
242         uint32_t                lkb_flags;      /* internal flags */
243         uint32_t                lkb_lvbseq;     /* lvb sequence number */
244 
245         int8_t                  lkb_status;     /* granted, waiting, convert */
246         int8_t                  lkb_rqmode;     /* requested lock mode */
247         int8_t                  lkb_grmode;     /* granted lock mode */
248         int8_t                  lkb_highbast;   /* highest mode bast sent for */
249 
250         int8_t                  lkb_wait_type;  /* type of reply waiting for */
251         int8_t                  lkb_wait_count;
252         int                     lkb_wait_nodeid; /* for debugging */
253 
254         struct list_head        lkb_statequeue; /* rsb g/c/w list */
255         struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
256         struct list_head        lkb_wait_reply; /* waiting for remote reply */
257         struct list_head        lkb_ownqueue;   /* list of locks for a process */
258         struct list_head        lkb_time_list;
259         ktime_t                 lkb_timestamp;
260         ktime_t                 lkb_wait_time;
261         unsigned long           lkb_timeout_cs;
262 
263         struct mutex            lkb_cb_mutex;
264         struct work_struct      lkb_cb_work;
265         struct list_head        lkb_cb_list; /* for ls_cb_delay or proc->asts */
266         struct dlm_callback     lkb_callbacks[DLM_CALLBACKS_SIZE];
267         struct dlm_callback     lkb_last_cast;
268         struct dlm_callback     lkb_last_bast;
269         ktime_t                 lkb_last_cast_time;     /* for debugging */
270         ktime_t                 lkb_last_bast_time;     /* for debugging */
271 
272         uint64_t                lkb_recover_seq; /* from ls_recover_seq */
273 
274         char                    *lkb_lvbptr;
275         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
276         void                    (*lkb_astfn) (void *astparam);
277         void                    (*lkb_bastfn) (void *astparam, int mode);
278         union {
279                 void                    *lkb_astparam;  /* caller's ast arg */
280                 struct dlm_user_args    *lkb_ua;
281         };
282 };
283 
284 /*
285  * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
286  * nodeid, even when nodeid is our_nodeid.
287  *
288  * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
289  * greater than zero when another nodeid.
290  *
291  * (TODO: remove res_nodeid and only use res_master_nodeid)
292  */
293 
294 struct dlm_rsb {
295         struct dlm_ls           *res_ls;        /* the lockspace */
296         struct kref             res_ref;
297         struct mutex            res_mutex;
298         unsigned long           res_flags;
299         int                     res_length;     /* length of rsb name */
300         int                     res_nodeid;
301         int                     res_master_nodeid;
302         int                     res_dir_nodeid;
303         int                     res_id;         /* for ls_recover_idr */
304         uint32_t                res_lvbseq;
305         uint32_t                res_hash;
306         uint32_t                res_bucket;     /* rsbtbl */
307         unsigned long           res_toss_time;
308         uint32_t                res_first_lkid;
309         struct list_head        res_lookup;     /* lkbs waiting on first */
310         union {
311                 struct list_head        res_hashchain;
312                 struct rb_node          res_hashnode;   /* rsbtbl */
313         };
314         struct list_head        res_grantqueue;
315         struct list_head        res_convertqueue;
316         struct list_head        res_waitqueue;
317 
318         struct list_head        res_root_list;      /* used for recovery */
319         struct list_head        res_recover_list;   /* used for recovery */
320         int                     res_recover_locks_count;
321 
322         char                    *res_lvbptr;
323         char                    res_name[DLM_RESNAME_MAXLEN+1];
324 };
325 
326 /* dlm_master_lookup() flags */
327 
328 #define DLM_LU_RECOVER_DIR      1
329 #define DLM_LU_RECOVER_MASTER   2
330 
331 /* dlm_master_lookup() results */
332 
333 #define DLM_LU_MATCH            1
334 #define DLM_LU_ADD              2
335 
336 /* find_rsb() flags */
337 
338 #define R_REQUEST               0x00000001
339 #define R_RECEIVE_REQUEST       0x00000002
340 #define R_RECEIVE_RECOVER       0x00000004
341 
342 /* rsb_flags */
343 
344 enum rsb_flags {
345         RSB_MASTER_UNCERTAIN,
346         RSB_VALNOTVALID,
347         RSB_VALNOTVALID_PREV,
348         RSB_NEW_MASTER,
349         RSB_NEW_MASTER2,
350         RSB_RECOVER_CONVERT,
351         RSB_RECOVER_GRANT,
352         RSB_RECOVER_LVB_INVAL,
353 };
354 
355 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
356 {
357         __set_bit(flag, &r->res_flags);
358 }
359 
360 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
361 {
362         __clear_bit(flag, &r->res_flags);
363 }
364 
365 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
366 {
367         return test_bit(flag, &r->res_flags);
368 }
369 
370 
371 /* dlm_header is first element of all structs sent between nodes */
372 
373 #define DLM_HEADER_MAJOR        0x00030000
374 #define DLM_HEADER_MINOR        0x00000001
375 
376 #define DLM_HEADER_SLOTS        0x00000001
377 
378 #define DLM_MSG                 1
379 #define DLM_RCOM                2
380 
381 struct dlm_header {
382         uint32_t                h_version;
383         uint32_t                h_lockspace;
384         uint32_t                h_nodeid;       /* nodeid of sender */
385         uint16_t                h_length;
386         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
387         uint8_t                 h_pad;
388 };
389 
390 
391 #define DLM_MSG_REQUEST         1
392 #define DLM_MSG_CONVERT         2
393 #define DLM_MSG_UNLOCK          3
394 #define DLM_MSG_CANCEL          4
395 #define DLM_MSG_REQUEST_REPLY   5
396 #define DLM_MSG_CONVERT_REPLY   6
397 #define DLM_MSG_UNLOCK_REPLY    7
398 #define DLM_MSG_CANCEL_REPLY    8
399 #define DLM_MSG_GRANT           9
400 #define DLM_MSG_BAST            10
401 #define DLM_MSG_LOOKUP          11
402 #define DLM_MSG_REMOVE          12
403 #define DLM_MSG_LOOKUP_REPLY    13
404 #define DLM_MSG_PURGE           14
405 
406 struct dlm_message {
407         struct dlm_header       m_header;
408         uint32_t                m_type;         /* DLM_MSG_ */
409         uint32_t                m_nodeid;
410         uint32_t                m_pid;
411         uint32_t                m_lkid;         /* lkid on sender */
412         uint32_t                m_remid;        /* lkid on receiver */
413         uint32_t                m_parent_lkid;
414         uint32_t                m_parent_remid;
415         uint32_t                m_exflags;
416         uint32_t                m_sbflags;
417         uint32_t                m_flags;
418         uint32_t                m_lvbseq;
419         uint32_t                m_hash;
420         int                     m_status;
421         int                     m_grmode;
422         int                     m_rqmode;
423         int                     m_bastmode;
424         int                     m_asts;
425         int                     m_result;       /* 0 or -EXXX */
426         char                    m_extra[0];     /* name or lvb */
427 };
428 
429 
430 #define DLM_RS_NODES            0x00000001
431 #define DLM_RS_NODES_ALL        0x00000002
432 #define DLM_RS_DIR              0x00000004
433 #define DLM_RS_DIR_ALL          0x00000008
434 #define DLM_RS_LOCKS            0x00000010
435 #define DLM_RS_LOCKS_ALL        0x00000020
436 #define DLM_RS_DONE             0x00000040
437 #define DLM_RS_DONE_ALL         0x00000080
438 
439 #define DLM_RCOM_STATUS         1
440 #define DLM_RCOM_NAMES          2
441 #define DLM_RCOM_LOOKUP         3
442 #define DLM_RCOM_LOCK           4
443 #define DLM_RCOM_STATUS_REPLY   5
444 #define DLM_RCOM_NAMES_REPLY    6
445 #define DLM_RCOM_LOOKUP_REPLY   7
446 #define DLM_RCOM_LOCK_REPLY     8
447 
448 struct dlm_rcom {
449         struct dlm_header       rc_header;
450         uint32_t                rc_type;        /* DLM_RCOM_ */
451         int                     rc_result;      /* multi-purpose */
452         uint64_t                rc_id;          /* match reply with request */
453         uint64_t                rc_seq;         /* sender's ls_recover_seq */
454         uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
455         char                    rc_buf[0];
456 };
457 
458 union dlm_packet {
459         struct dlm_header       header;         /* common to other two */
460         struct dlm_message      message;
461         struct dlm_rcom         rcom;
462 };
463 
464 #define DLM_RSF_NEED_SLOTS      0x00000001
465 
466 /* RCOM_STATUS data */
467 struct rcom_status {
468         __le32                  rs_flags;
469         __le32                  rs_unused1;
470         __le64                  rs_unused2;
471 };
472 
473 /* RCOM_STATUS_REPLY data */
474 struct rcom_config {
475         __le32                  rf_lvblen;
476         __le32                  rf_lsflags;
477 
478         /* DLM_HEADER_SLOTS adds: */
479         __le32                  rf_flags;
480         __le16                  rf_our_slot;
481         __le16                  rf_num_slots;
482         __le32                  rf_generation;
483         __le32                  rf_unused1;
484         __le64                  rf_unused2;
485 };
486 
487 struct rcom_slot {
488         __le32                  ro_nodeid;
489         __le16                  ro_slot;
490         __le16                  ro_unused1;
491         __le64                  ro_unused2;
492 };
493 
494 struct rcom_lock {
495         __le32                  rl_ownpid;
496         __le32                  rl_lkid;
497         __le32                  rl_remid;
498         __le32                  rl_parent_lkid;
499         __le32                  rl_parent_remid;
500         __le32                  rl_exflags;
501         __le32                  rl_flags;
502         __le32                  rl_lvbseq;
503         __le32                  rl_result;
504         int8_t                  rl_rqmode;
505         int8_t                  rl_grmode;
506         int8_t                  rl_status;
507         int8_t                  rl_asts;
508         __le16                  rl_wait_type;
509         __le16                  rl_namelen;
510         char                    rl_name[DLM_RESNAME_MAXLEN];
511         char                    rl_lvb[0];
512 };
513 
514 /*
515  * The max number of resources per rsbtbl bucket that shrink will attempt
516  * to remove in each iteration.
517  */
518 
519 #define DLM_REMOVE_NAMES_MAX 8
520 
521 struct dlm_ls {
522         struct list_head        ls_list;        /* list of lockspaces */
523         dlm_lockspace_t         *ls_local_handle;
524         uint32_t                ls_global_id;   /* global unique lockspace ID */
525         uint32_t                ls_generation;
526         uint32_t                ls_exflags;
527         int                     ls_lvblen;
528         int                     ls_count;       /* refcount of processes in
529                                                    the dlm using this ls */
530         int                     ls_create_count; /* create/release refcount */
531         unsigned long           ls_flags;       /* LSFL_ */
532         unsigned long           ls_scan_time;
533         struct kobject          ls_kobj;
534 
535         struct idr              ls_lkbidr;
536         spinlock_t              ls_lkbidr_spin;
537 
538         struct dlm_rsbtable     *ls_rsbtbl;
539         uint32_t                ls_rsbtbl_size;
540 
541         struct mutex            ls_waiters_mutex;
542         struct list_head        ls_waiters;     /* lkbs needing a reply */
543 
544         struct mutex            ls_orphans_mutex;
545         struct list_head        ls_orphans;
546 
547         struct mutex            ls_timeout_mutex;
548         struct list_head        ls_timeout;
549 
550         spinlock_t              ls_new_rsb_spin;
551         int                     ls_new_rsb_count;
552         struct list_head        ls_new_rsb;     /* new rsb structs */
553 
554         spinlock_t              ls_remove_spin;
555         char                    ls_remove_name[DLM_RESNAME_MAXLEN+1];
556         char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
557         int                     ls_remove_len;
558         int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
559 
560         struct list_head        ls_nodes;       /* current nodes in ls */
561         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
562         int                     ls_num_nodes;   /* number of nodes in ls */
563         int                     ls_low_nodeid;
564         int                     ls_total_weight;
565         int                     *ls_node_array;
566 
567         int                     ls_slot;
568         int                     ls_num_slots;
569         int                     ls_slots_size;
570         struct dlm_slot         *ls_slots;
571 
572         struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
573         struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
574         struct dlm_message      ls_stub_ms;     /* for faking a reply */
575 
576         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
577         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
578         struct dentry           *ls_debug_locks_dentry; /* debugfs */
579         struct dentry           *ls_debug_all_dentry; /* debugfs */
580         struct dentry           *ls_debug_toss_dentry; /* debugfs */
581 
582         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
583         int                     ls_uevent_result;
584         struct completion       ls_members_done;
585         int                     ls_members_result;
586 
587         struct miscdevice       ls_device;
588 
589         struct workqueue_struct *ls_callback_wq;
590 
591         /* recovery related */
592 
593         struct mutex            ls_cb_mutex;
594         struct list_head        ls_cb_delay; /* save for queue_work later */
595         struct timer_list       ls_timer;
596         struct task_struct      *ls_recoverd_task;
597         struct mutex            ls_recoverd_active;
598         spinlock_t              ls_recover_lock;
599         unsigned long           ls_recover_begin; /* jiffies timestamp */
600         uint32_t                ls_recover_status; /* DLM_RS_ */
601         uint64_t                ls_recover_seq;
602         struct dlm_recover      *ls_recover_args;
603         struct rw_semaphore     ls_in_recovery; /* block local requests */
604         struct rw_semaphore     ls_recv_active; /* block dlm_recv */
605         struct list_head        ls_requestqueue;/* queue remote requests */
606         struct mutex            ls_requestqueue_mutex;
607         struct dlm_rcom         *ls_recover_buf;
608         int                     ls_recover_nodeid; /* for debugging */
609         unsigned int            ls_recover_dir_sent_res; /* for log info */
610         unsigned int            ls_recover_dir_sent_msg; /* for log info */
611         unsigned int            ls_recover_locks_in; /* for log info */
612         uint64_t                ls_rcom_seq;
613         spinlock_t              ls_rcom_spin;
614         struct list_head        ls_recover_list;
615         spinlock_t              ls_recover_list_lock;
616         int                     ls_recover_list_count;
617         struct idr              ls_recover_idr;
618         spinlock_t              ls_recover_idr_lock;
619         wait_queue_head_t       ls_wait_general;
620         wait_queue_head_t       ls_recover_lock_wait;
621         struct mutex            ls_clear_proc_locks;
622 
623         struct list_head        ls_root_list;   /* root resources */
624         struct rw_semaphore     ls_root_sem;    /* protect root_list */
625 
626         const struct dlm_lockspace_ops *ls_ops;
627         void                    *ls_ops_arg;
628 
629         int                     ls_namelen;
630         char                    ls_name[1];
631 };
632 
633 /*
634  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
635  * that they should abort what they're doing so new recovery can be started.
636  *
637  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
638  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
639  * within dlm_ls_stop causes complaints about the lock acquired/released
640  * in different contexts.)
641  *
642  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
643  * It sets this after it is done with down_write() on the in_recovery
644  * rw_semaphore and clears it after it has released the rw_semaphore.
645  *
646  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
647  * should begin recovery of the lockspace.
648  *
649  * LSFL_RUNNING - set when normal locking activity is enabled.
650  * dlm_ls_stop() clears this to tell dlm locking routines that they should
651  * quit what they are doing so recovery can run.  dlm_recoverd sets
652  * this after recovery is finished.
653  */
654 
655 #define LSFL_RECOVER_STOP       0
656 #define LSFL_RECOVER_DOWN       1
657 #define LSFL_RECOVER_LOCK       2
658 #define LSFL_RECOVER_WORK       3
659 #define LSFL_RUNNING            4
660 
661 #define LSFL_RCOM_READY         5
662 #define LSFL_RCOM_WAIT          6
663 #define LSFL_UEVENT_WAIT        7
664 #define LSFL_TIMEWARN           8
665 #define LSFL_CB_DELAY           9
666 #define LSFL_NODIR              10
667 
668 /* much of this is just saving user space pointers associated with the
669    lock that we pass back to the user lib with an ast */
670 
671 struct dlm_user_args {
672         struct dlm_user_proc    *proc; /* each process that opens the lockspace
673                                           device has private data
674                                           (dlm_user_proc) on the struct file,
675                                           the process's locks point back to it*/
676         struct dlm_lksb         lksb;
677         struct dlm_lksb __user  *user_lksb;
678         void __user             *castparam;
679         void __user             *castaddr;
680         void __user             *bastparam;
681         void __user             *bastaddr;
682         uint64_t                xid;
683 };
684 
685 #define DLM_PROC_FLAGS_CLOSING 1
686 #define DLM_PROC_FLAGS_COMPAT  2
687 
688 /* locks list is kept so we can remove all a process's locks when it
689    exits (or orphan those that are persistent) */
690 
691 struct dlm_user_proc {
692         dlm_lockspace_t         *lockspace;
693         unsigned long           flags; /* DLM_PROC_FLAGS */
694         struct list_head        asts;
695         spinlock_t              asts_spin;
696         struct list_head        locks;
697         spinlock_t              locks_spin;
698         struct list_head        unlocking;
699         wait_queue_head_t       wait;
700 };
701 
702 static inline int dlm_locking_stopped(struct dlm_ls *ls)
703 {
704         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
705 }
706 
707 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
708 {
709         return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
710 }
711 
712 static inline int dlm_no_directory(struct dlm_ls *ls)
713 {
714         return test_bit(LSFL_NODIR, &ls->ls_flags);
715 }
716 
717 int dlm_netlink_init(void);
718 void dlm_netlink_exit(void);
719 void dlm_timeout_warn(struct dlm_lkb *lkb);
720 int dlm_plock_init(void);
721 void dlm_plock_exit(void);
722 
723 #ifdef CONFIG_DLM_DEBUG
724 int dlm_register_debugfs(void);
725 void dlm_unregister_debugfs(void);
726 int dlm_create_debug_file(struct dlm_ls *ls);
727 void dlm_delete_debug_file(struct dlm_ls *ls);
728 #else
729 static inline int dlm_register_debugfs(void) { return 0; }
730 static inline void dlm_unregister_debugfs(void) { }
731 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
732 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
733 #endif
734 
735 #endif                          /* __DLM_INTERNAL_DOT_H__ */
736 
737 

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