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

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