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0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * dlmcommon.h
0004  *
0005  * Copyright (C) 2004 Oracle.  All rights reserved.
0006  */
0007 
0008 #ifndef DLMCOMMON_H
0009 #define DLMCOMMON_H
0010 
0011 #include <linux/kref.h>
0012 
0013 #define DLM_HB_NODE_DOWN_PRI     (0xf000000)
0014 #define DLM_HB_NODE_UP_PRI       (0x8000000)
0015 
0016 #define DLM_LOCKID_NAME_MAX    32
0017 
0018 #define DLM_LOCK_RES_OWNER_UNKNOWN     O2NM_MAX_NODES
0019 
0020 #define DLM_HASH_SIZE_DEFAULT   (1 << 17)
0021 #if DLM_HASH_SIZE_DEFAULT < PAGE_SIZE
0022 # define DLM_HASH_PAGES     1
0023 #else
0024 # define DLM_HASH_PAGES     (DLM_HASH_SIZE_DEFAULT / PAGE_SIZE)
0025 #endif
0026 #define DLM_BUCKETS_PER_PAGE    (PAGE_SIZE / sizeof(struct hlist_head))
0027 #define DLM_HASH_BUCKETS    (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
0028 
0029 /* Intended to make it easier for us to switch out hash functions */
0030 #define dlm_lockid_hash(_n, _l) full_name_hash(NULL, _n, _l)
0031 
0032 enum dlm_mle_type {
0033     DLM_MLE_BLOCK = 0,
0034     DLM_MLE_MASTER = 1,
0035     DLM_MLE_MIGRATION = 2,
0036     DLM_MLE_NUM_TYPES = 3,
0037 };
0038 
0039 struct dlm_master_list_entry {
0040     struct hlist_node master_hash_node;
0041     struct list_head hb_events;
0042     struct dlm_ctxt *dlm;
0043     spinlock_t spinlock;
0044     wait_queue_head_t wq;
0045     atomic_t woken;
0046     struct kref mle_refs;
0047     int inuse;
0048     unsigned long maybe_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0049     unsigned long vote_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0050     unsigned long response_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0051     unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0052     u8 master;
0053     u8 new_master;
0054     enum dlm_mle_type type;
0055     struct o2hb_callback_func mle_hb_up;
0056     struct o2hb_callback_func mle_hb_down;
0057     struct dlm_lock_resource *mleres;
0058     unsigned char mname[DLM_LOCKID_NAME_MAX];
0059     unsigned int mnamelen;
0060     unsigned int mnamehash;
0061 };
0062 
0063 enum dlm_ast_type {
0064     DLM_AST = 0,
0065     DLM_BAST = 1,
0066     DLM_ASTUNLOCK = 2,
0067 };
0068 
0069 
0070 #define LKM_VALID_FLAGS (LKM_VALBLK | LKM_CONVERT | LKM_UNLOCK | \
0071              LKM_CANCEL | LKM_INVVALBLK | LKM_FORCE | \
0072              LKM_RECOVERY | LKM_LOCAL | LKM_NOQUEUE)
0073 
0074 #define DLM_RECOVERY_LOCK_NAME       "$RECOVERY"
0075 #define DLM_RECOVERY_LOCK_NAME_LEN   9
0076 
0077 static inline int dlm_is_recovery_lock(const char *lock_name, int name_len)
0078 {
0079     if (name_len == DLM_RECOVERY_LOCK_NAME_LEN &&
0080         memcmp(lock_name, DLM_RECOVERY_LOCK_NAME, name_len)==0)
0081         return 1;
0082     return 0;
0083 }
0084 
0085 #define DLM_RECO_STATE_ACTIVE    0x0001
0086 #define DLM_RECO_STATE_FINALIZE  0x0002
0087 
0088 struct dlm_recovery_ctxt
0089 {
0090     struct list_head resources;
0091     struct list_head node_data;
0092     u8  new_master;
0093     u8  dead_node;
0094     u16 state;
0095     unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0096     wait_queue_head_t event;
0097 };
0098 
0099 enum dlm_ctxt_state {
0100     DLM_CTXT_NEW = 0,
0101     DLM_CTXT_JOINED = 1,
0102     DLM_CTXT_IN_SHUTDOWN = 2,
0103     DLM_CTXT_LEAVING = 3,
0104 };
0105 
0106 struct dlm_ctxt
0107 {
0108     struct list_head list;
0109     struct hlist_head **lockres_hash;
0110     struct list_head dirty_list;
0111     struct list_head purge_list;
0112     struct list_head pending_asts;
0113     struct list_head pending_basts;
0114     struct list_head tracking_list;
0115     unsigned int purge_count;
0116     spinlock_t spinlock;
0117     spinlock_t ast_lock;
0118     spinlock_t track_lock;
0119     char *name;
0120     u8 node_num;
0121     u32 key;
0122     u8  joining_node;
0123     u8 migrate_done; /* set to 1 means node has migrated all lock resources */
0124     wait_queue_head_t dlm_join_events;
0125     unsigned long live_nodes_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0126     unsigned long domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0127     unsigned long exit_domain_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0128     unsigned long recovery_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0129     struct dlm_recovery_ctxt reco;
0130     spinlock_t master_lock;
0131     struct hlist_head **master_hash;
0132     struct list_head mle_hb_events;
0133 
0134     /* these give a really vague idea of the system load */
0135     atomic_t mle_tot_count[DLM_MLE_NUM_TYPES];
0136     atomic_t mle_cur_count[DLM_MLE_NUM_TYPES];
0137     atomic_t res_tot_count;
0138     atomic_t res_cur_count;
0139 
0140     struct dentry *dlm_debugfs_subroot;
0141 
0142     /* NOTE: Next three are protected by dlm_domain_lock */
0143     struct kref dlm_refs;
0144     enum dlm_ctxt_state dlm_state;
0145     unsigned int num_joins;
0146 
0147     struct o2hb_callback_func dlm_hb_up;
0148     struct o2hb_callback_func dlm_hb_down;
0149     struct task_struct *dlm_thread_task;
0150     struct task_struct *dlm_reco_thread_task;
0151     struct workqueue_struct *dlm_worker;
0152     wait_queue_head_t dlm_thread_wq;
0153     wait_queue_head_t dlm_reco_thread_wq;
0154     wait_queue_head_t ast_wq;
0155     wait_queue_head_t migration_wq;
0156 
0157     struct work_struct dispatched_work;
0158     struct list_head work_list;
0159     spinlock_t work_lock;
0160     struct list_head dlm_domain_handlers;
0161     struct list_head    dlm_eviction_callbacks;
0162 
0163     /* The filesystem specifies this at domain registration.  We
0164      * cache it here to know what to tell other nodes. */
0165     struct dlm_protocol_version fs_locking_proto;
0166     /* This is the inter-dlm communication version */
0167     struct dlm_protocol_version dlm_locking_proto;
0168 };
0169 
0170 static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
0171 {
0172     return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
0173 }
0174 
0175 static inline struct hlist_head *dlm_master_hash(struct dlm_ctxt *dlm,
0176                          unsigned i)
0177 {
0178     return dlm->master_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] +
0179             (i % DLM_BUCKETS_PER_PAGE);
0180 }
0181 
0182 /* these keventd work queue items are for less-frequently
0183  * called functions that cannot be directly called from the
0184  * net message handlers for some reason, usually because
0185  * they need to send net messages of their own. */
0186 void dlm_dispatch_work(struct work_struct *work);
0187 
0188 struct dlm_lock_resource;
0189 struct dlm_work_item;
0190 
0191 typedef void (dlm_workfunc_t)(struct dlm_work_item *, void *);
0192 
0193 struct dlm_request_all_locks_priv
0194 {
0195     u8 reco_master;
0196     u8 dead_node;
0197 };
0198 
0199 struct dlm_mig_lockres_priv
0200 {
0201     struct dlm_lock_resource *lockres;
0202     u8 real_master;
0203     u8 extra_ref;
0204 };
0205 
0206 struct dlm_assert_master_priv
0207 {
0208     struct dlm_lock_resource *lockres;
0209     u8 request_from;
0210     u32 flags;
0211     unsigned ignore_higher:1;
0212 };
0213 
0214 struct dlm_deref_lockres_priv
0215 {
0216     struct dlm_lock_resource *deref_res;
0217     u8 deref_node;
0218 };
0219 
0220 struct dlm_work_item
0221 {
0222     struct list_head list;
0223     dlm_workfunc_t *func;
0224     struct dlm_ctxt *dlm;
0225     void *data;
0226     union {
0227         struct dlm_request_all_locks_priv ral;
0228         struct dlm_mig_lockres_priv ml;
0229         struct dlm_assert_master_priv am;
0230         struct dlm_deref_lockres_priv dl;
0231     } u;
0232 };
0233 
0234 static inline void dlm_init_work_item(struct dlm_ctxt *dlm,
0235                       struct dlm_work_item *i,
0236                       dlm_workfunc_t *f, void *data)
0237 {
0238     memset(i, 0, sizeof(*i));
0239     i->func = f;
0240     INIT_LIST_HEAD(&i->list);
0241     i->data = data;
0242     i->dlm = dlm;  /* must have already done a dlm_grab on this! */
0243 }
0244 
0245 
0246 
0247 static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
0248                       u8 node)
0249 {
0250     assert_spin_locked(&dlm->spinlock);
0251 
0252     dlm->joining_node = node;
0253     wake_up(&dlm->dlm_join_events);
0254 }
0255 
0256 #define DLM_LOCK_RES_UNINITED             0x00000001
0257 #define DLM_LOCK_RES_RECOVERING           0x00000002
0258 #define DLM_LOCK_RES_READY                0x00000004
0259 #define DLM_LOCK_RES_DIRTY                0x00000008
0260 #define DLM_LOCK_RES_IN_PROGRESS          0x00000010
0261 #define DLM_LOCK_RES_MIGRATING            0x00000020
0262 #define DLM_LOCK_RES_DROPPING_REF         0x00000040
0263 #define DLM_LOCK_RES_BLOCK_DIRTY          0x00001000
0264 #define DLM_LOCK_RES_SETREF_INPROG        0x00002000
0265 #define DLM_LOCK_RES_RECOVERY_WAITING     0x00004000
0266 
0267 /* max milliseconds to wait to sync up a network failure with a node death */
0268 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
0269 
0270 #define DLM_PURGE_INTERVAL_MS   (8 * 1000)
0271 
0272 struct dlm_lock_resource
0273 {
0274     /* WARNING: Please see the comment in dlm_init_lockres before
0275      * adding fields here. */
0276     struct hlist_node hash_node;
0277     struct qstr lockname;
0278     struct kref      refs;
0279 
0280     /*
0281      * Please keep granted, converting, and blocked in this order,
0282      * as some funcs want to iterate over all lists.
0283      *
0284      * All four lists are protected by the hash's reference.
0285      */
0286     struct list_head granted;
0287     struct list_head converting;
0288     struct list_head blocked;
0289     struct list_head purge;
0290 
0291     /*
0292      * These two lists require you to hold an additional reference
0293      * while they are on the list.
0294      */
0295     struct list_head dirty;
0296     struct list_head recovering; // dlm_recovery_ctxt.resources list
0297 
0298     /* Added during init and removed during release */
0299     struct list_head tracking;  /* dlm->tracking_list */
0300 
0301     /* unused lock resources have their last_used stamped and are
0302      * put on a list for the dlm thread to run. */
0303     unsigned long    last_used;
0304 
0305     struct dlm_ctxt *dlm;
0306 
0307     unsigned migration_pending:1;
0308     atomic_t asts_reserved;
0309     spinlock_t spinlock;
0310     wait_queue_head_t wq;
0311     u8  owner;              //node which owns the lock resource, or unknown
0312     u16 state;
0313     char lvb[DLM_LVB_LEN];
0314     unsigned int inflight_locks;
0315     unsigned int inflight_assert_workers;
0316     unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
0317 };
0318 
0319 struct dlm_migratable_lock
0320 {
0321     __be64 cookie;
0322 
0323     /* these 3 are just padding for the in-memory structure, but
0324      * list and flags are actually used when sent over the wire */
0325     __be16 pad1;
0326     u8 list;  // 0=granted, 1=converting, 2=blocked
0327     u8 flags;
0328 
0329     s8 type;
0330     s8 convert_type;
0331     s8 highest_blocked;
0332     u8 node;
0333 };  // 16 bytes
0334 
0335 struct dlm_lock
0336 {
0337     struct dlm_migratable_lock ml;
0338 
0339     struct list_head list;
0340     struct list_head ast_list;
0341     struct list_head bast_list;
0342     struct dlm_lock_resource *lockres;
0343     spinlock_t spinlock;
0344     struct kref lock_refs;
0345 
0346     // ast and bast must be callable while holding a spinlock!
0347     dlm_astlockfunc_t *ast;
0348     dlm_bastlockfunc_t *bast;
0349     void *astdata;
0350     struct dlm_lockstatus *lksb;
0351     unsigned ast_pending:1,
0352          bast_pending:1,
0353          convert_pending:1,
0354          lock_pending:1,
0355          cancel_pending:1,
0356          unlock_pending:1,
0357          lksb_kernel_allocated:1;
0358 };
0359 
0360 enum dlm_lockres_list {
0361     DLM_GRANTED_LIST = 0,
0362     DLM_CONVERTING_LIST = 1,
0363     DLM_BLOCKED_LIST = 2,
0364 };
0365 
0366 static inline int dlm_lvb_is_empty(char *lvb)
0367 {
0368     int i;
0369     for (i=0; i<DLM_LVB_LEN; i++)
0370         if (lvb[i])
0371             return 0;
0372     return 1;
0373 }
0374 
0375 static inline char *dlm_list_in_text(enum dlm_lockres_list idx)
0376 {
0377     if (idx == DLM_GRANTED_LIST)
0378         return "granted";
0379     else if (idx == DLM_CONVERTING_LIST)
0380         return "converting";
0381     else if (idx == DLM_BLOCKED_LIST)
0382         return "blocked";
0383     else
0384         return "unknown";
0385 }
0386 
0387 static inline struct list_head *
0388 dlm_list_idx_to_ptr(struct dlm_lock_resource *res, enum dlm_lockres_list idx)
0389 {
0390     struct list_head *ret = NULL;
0391     if (idx == DLM_GRANTED_LIST)
0392         ret = &res->granted;
0393     else if (idx == DLM_CONVERTING_LIST)
0394         ret = &res->converting;
0395     else if (idx == DLM_BLOCKED_LIST)
0396         ret = &res->blocked;
0397     else
0398         BUG();
0399     return ret;
0400 }
0401 
0402 
0403 
0404 
0405 struct dlm_node_iter
0406 {
0407     unsigned long node_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
0408     int curnode;
0409 };
0410 
0411 
0412 enum {
0413     DLM_MASTER_REQUEST_MSG      = 500,
0414     DLM_UNUSED_MSG1         = 501,
0415     DLM_ASSERT_MASTER_MSG       = 502,
0416     DLM_CREATE_LOCK_MSG     = 503,
0417     DLM_CONVERT_LOCK_MSG        = 504,
0418     DLM_PROXY_AST_MSG       = 505,
0419     DLM_UNLOCK_LOCK_MSG     = 506,
0420     DLM_DEREF_LOCKRES_MSG       = 507,
0421     DLM_MIGRATE_REQUEST_MSG     = 508,
0422     DLM_MIG_LOCKRES_MSG     = 509,
0423     DLM_QUERY_JOIN_MSG      = 510,
0424     DLM_ASSERT_JOINED_MSG       = 511,
0425     DLM_CANCEL_JOIN_MSG     = 512,
0426     DLM_EXIT_DOMAIN_MSG     = 513,
0427     DLM_MASTER_REQUERY_MSG      = 514,
0428     DLM_LOCK_REQUEST_MSG        = 515,
0429     DLM_RECO_DATA_DONE_MSG      = 516,
0430     DLM_BEGIN_RECO_MSG      = 517,
0431     DLM_FINALIZE_RECO_MSG       = 518,
0432     DLM_QUERY_REGION        = 519,
0433     DLM_QUERY_NODEINFO      = 520,
0434     DLM_BEGIN_EXIT_DOMAIN_MSG   = 521,
0435     DLM_DEREF_LOCKRES_DONE      = 522,
0436 };
0437 
0438 struct dlm_reco_node_data
0439 {
0440     int state;
0441     u8 node_num;
0442     struct list_head list;
0443 };
0444 
0445 enum {
0446     DLM_RECO_NODE_DATA_DEAD = -1,
0447     DLM_RECO_NODE_DATA_INIT = 0,
0448     DLM_RECO_NODE_DATA_REQUESTING = 1,
0449     DLM_RECO_NODE_DATA_REQUESTED = 2,
0450     DLM_RECO_NODE_DATA_RECEIVING = 3,
0451     DLM_RECO_NODE_DATA_DONE = 4,
0452     DLM_RECO_NODE_DATA_FINALIZE_SENT = 5,
0453 };
0454 
0455 
0456 enum {
0457     DLM_MASTER_RESP_NO = 0,
0458     DLM_MASTER_RESP_YES = 1,
0459     DLM_MASTER_RESP_MAYBE = 2,
0460     DLM_MASTER_RESP_ERROR = 3,
0461 };
0462 
0463 
0464 struct dlm_master_request
0465 {
0466     u8 node_idx;
0467     u8 namelen;
0468     __be16 pad1;
0469     __be32 flags;
0470 
0471     u8 name[O2NM_MAX_NAME_LEN];
0472 };
0473 
0474 #define DLM_ASSERT_RESPONSE_REASSERT       0x00000001
0475 #define DLM_ASSERT_RESPONSE_MASTERY_REF    0x00000002
0476 
0477 #define DLM_ASSERT_MASTER_MLE_CLEANUP      0x00000001
0478 #define DLM_ASSERT_MASTER_REQUERY          0x00000002
0479 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
0480 struct dlm_assert_master
0481 {
0482     u8 node_idx;
0483     u8 namelen;
0484     __be16 pad1;
0485     __be32 flags;
0486 
0487     u8 name[O2NM_MAX_NAME_LEN];
0488 };
0489 
0490 #define DLM_MIGRATE_RESPONSE_MASTERY_REF   0x00000001
0491 
0492 struct dlm_migrate_request
0493 {
0494     u8 master;
0495     u8 new_master;
0496     u8 namelen;
0497     u8 pad1;
0498     __be32 pad2;
0499     u8 name[O2NM_MAX_NAME_LEN];
0500 };
0501 
0502 struct dlm_master_requery
0503 {
0504     u8 pad1;
0505     u8 pad2;
0506     u8 node_idx;
0507     u8 namelen;
0508     __be32 pad3;
0509     u8 name[O2NM_MAX_NAME_LEN];
0510 };
0511 
0512 #define DLM_MRES_RECOVERY   0x01
0513 #define DLM_MRES_MIGRATION  0x02
0514 #define DLM_MRES_ALL_DONE   0x04
0515 
0516 /*
0517  * We would like to get one whole lockres into a single network
0518  * message whenever possible.  Generally speaking, there will be
0519  * at most one dlm_lock on a lockres for each node in the cluster,
0520  * plus (infrequently) any additional locks coming in from userdlm.
0521  *
0522  * struct _dlm_lockres_page
0523  * {
0524  *  dlm_migratable_lockres mres;
0525  *  dlm_migratable_lock ml[DLM_MAX_MIGRATABLE_LOCKS];
0526  *  u8 pad[DLM_MIG_LOCKRES_RESERVED];
0527  * };
0528  *
0529  * from ../cluster/tcp.h
0530  *    O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(net_msg))
0531  *    (roughly 4080 bytes)
0532  * and sizeof(dlm_migratable_lockres) = 112 bytes
0533  * and sizeof(dlm_migratable_lock) = 16 bytes
0534  *
0535  * Choosing DLM_MAX_MIGRATABLE_LOCKS=240 and
0536  * DLM_MIG_LOCKRES_RESERVED=128 means we have this:
0537  *
0538  *  (DLM_MAX_MIGRATABLE_LOCKS * sizeof(dlm_migratable_lock)) +
0539  *     sizeof(dlm_migratable_lockres) + DLM_MIG_LOCKRES_RESERVED =
0540  *        NET_MAX_PAYLOAD_BYTES
0541  *  (240 * 16) + 112 + 128 = 4080
0542  *
0543  * So a lockres would need more than 240 locks before it would
0544  * use more than one network packet to recover.  Not too bad.
0545  */
0546 #define DLM_MAX_MIGRATABLE_LOCKS   240
0547 
0548 struct dlm_migratable_lockres
0549 {
0550     u8 master;
0551     u8 lockname_len;
0552     u8 num_locks;    // locks sent in this structure
0553     u8 flags;
0554     __be32 total_locks; // locks to be sent for this migration cookie
0555     __be64 mig_cookie;  // cookie for this lockres migration
0556              // or zero if not needed
0557     // 16 bytes
0558     u8 lockname[DLM_LOCKID_NAME_MAX];
0559     // 48 bytes
0560     u8 lvb[DLM_LVB_LEN];
0561     // 112 bytes
0562     struct dlm_migratable_lock ml[];  // 16 bytes each, begins at byte 112
0563 };
0564 #define DLM_MIG_LOCKRES_MAX_LEN  \
0565     (sizeof(struct dlm_migratable_lockres) + \
0566      (sizeof(struct dlm_migratable_lock) * \
0567       DLM_MAX_MIGRATABLE_LOCKS) )
0568 
0569 /* from above, 128 bytes
0570  * for some undetermined future use */
0571 #define DLM_MIG_LOCKRES_RESERVED   (O2NET_MAX_PAYLOAD_BYTES - \
0572                     DLM_MIG_LOCKRES_MAX_LEN)
0573 
0574 struct dlm_create_lock
0575 {
0576     __be64 cookie;
0577 
0578     __be32 flags;
0579     u8 pad1;
0580     u8 node_idx;
0581     s8 requested_type;
0582     u8 namelen;
0583 
0584     u8 name[O2NM_MAX_NAME_LEN];
0585 };
0586 
0587 struct dlm_convert_lock
0588 {
0589     __be64 cookie;
0590 
0591     __be32 flags;
0592     u8 pad1;
0593     u8 node_idx;
0594     s8 requested_type;
0595     u8 namelen;
0596 
0597     u8 name[O2NM_MAX_NAME_LEN];
0598 
0599     s8 lvb[];
0600 };
0601 #define DLM_CONVERT_LOCK_MAX_LEN  (sizeof(struct dlm_convert_lock)+DLM_LVB_LEN)
0602 
0603 struct dlm_unlock_lock
0604 {
0605     __be64 cookie;
0606 
0607     __be32 flags;
0608     __be16 pad1;
0609     u8 node_idx;
0610     u8 namelen;
0611 
0612     u8 name[O2NM_MAX_NAME_LEN];
0613 
0614     s8 lvb[];
0615 };
0616 #define DLM_UNLOCK_LOCK_MAX_LEN  (sizeof(struct dlm_unlock_lock)+DLM_LVB_LEN)
0617 
0618 struct dlm_proxy_ast
0619 {
0620     __be64 cookie;
0621 
0622     __be32 flags;
0623     u8 node_idx;
0624     u8 type;
0625     u8 blocked_type;
0626     u8 namelen;
0627 
0628     u8 name[O2NM_MAX_NAME_LEN];
0629 
0630     s8 lvb[];
0631 };
0632 #define DLM_PROXY_AST_MAX_LEN  (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)
0633 
0634 #define DLM_MOD_KEY (0x666c6172)
0635 enum dlm_query_join_response_code {
0636     JOIN_DISALLOW = 0,
0637     JOIN_OK = 1,
0638     JOIN_OK_NO_MAP = 2,
0639     JOIN_PROTOCOL_MISMATCH = 3,
0640 };
0641 
0642 struct dlm_query_join_packet {
0643     u8 code;    /* Response code.  dlm_minor and fs_minor
0644                are only valid if this is JOIN_OK */
0645     u8 dlm_minor;   /* The minor version of the protocol the
0646                dlm is speaking. */
0647     u8 fs_minor;    /* The minor version of the protocol the
0648                filesystem is speaking. */
0649     u8 reserved;
0650 };
0651 
0652 union dlm_query_join_response {
0653     __be32 intval;
0654     struct dlm_query_join_packet packet;
0655 };
0656 
0657 struct dlm_lock_request
0658 {
0659     u8 node_idx;
0660     u8 dead_node;
0661     __be16 pad1;
0662     __be32 pad2;
0663 };
0664 
0665 struct dlm_reco_data_done
0666 {
0667     u8 node_idx;
0668     u8 dead_node;
0669     __be16 pad1;
0670     __be32 pad2;
0671 
0672     /* unused for now */
0673     /* eventually we can use this to attempt
0674      * lvb recovery based on each node's info */
0675     u8 reco_lvb[DLM_LVB_LEN];
0676 };
0677 
0678 struct dlm_begin_reco
0679 {
0680     u8 node_idx;
0681     u8 dead_node;
0682     __be16 pad1;
0683     __be32 pad2;
0684 };
0685 
0686 struct dlm_query_join_request
0687 {
0688     u8 node_idx;
0689     u8 pad1[2];
0690     u8 name_len;
0691     struct dlm_protocol_version dlm_proto;
0692     struct dlm_protocol_version fs_proto;
0693     u8 domain[O2NM_MAX_NAME_LEN];
0694     u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
0695 };
0696 
0697 struct dlm_assert_joined
0698 {
0699     u8 node_idx;
0700     u8 pad1[2];
0701     u8 name_len;
0702     u8 domain[O2NM_MAX_NAME_LEN];
0703 };
0704 
0705 struct dlm_cancel_join
0706 {
0707     u8 node_idx;
0708     u8 pad1[2];
0709     u8 name_len;
0710     u8 domain[O2NM_MAX_NAME_LEN];
0711 };
0712 
0713 struct dlm_query_region {
0714     u8 qr_node;
0715     u8 qr_numregions;
0716     u8 qr_namelen;
0717     u8 pad1;
0718     u8 qr_domain[O2NM_MAX_NAME_LEN];
0719     u8 qr_regions[O2HB_MAX_REGION_NAME_LEN * O2NM_MAX_REGIONS];
0720 };
0721 
0722 struct dlm_node_info {
0723     u8 ni_nodenum;
0724     u8 pad1;
0725     __be16 ni_ipv4_port;
0726     __be32 ni_ipv4_address;
0727 };
0728 
0729 struct dlm_query_nodeinfo {
0730     u8 qn_nodenum;
0731     u8 qn_numnodes;
0732     u8 qn_namelen;
0733     u8 pad1;
0734     u8 qn_domain[O2NM_MAX_NAME_LEN];
0735     struct dlm_node_info qn_nodes[O2NM_MAX_NODES];
0736 };
0737 
0738 struct dlm_exit_domain
0739 {
0740     u8 node_idx;
0741     u8 pad1[3];
0742 };
0743 
0744 struct dlm_finalize_reco
0745 {
0746     u8 node_idx;
0747     u8 dead_node;
0748     u8 flags;
0749     u8 pad1;
0750     __be32 pad2;
0751 };
0752 
0753 struct dlm_deref_lockres
0754 {
0755     u32 pad1;
0756     u16 pad2;
0757     u8 node_idx;
0758     u8 namelen;
0759 
0760     u8 name[O2NM_MAX_NAME_LEN];
0761 };
0762 
0763 enum {
0764     DLM_DEREF_RESPONSE_DONE = 0,
0765     DLM_DEREF_RESPONSE_INPROG = 1,
0766 };
0767 
0768 struct dlm_deref_lockres_done {
0769     u32 pad1;
0770     u16 pad2;
0771     u8 node_idx;
0772     u8 namelen;
0773 
0774     u8 name[O2NM_MAX_NAME_LEN];
0775 };
0776 
0777 static inline enum dlm_status
0778 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
0779 {
0780     enum dlm_status status = DLM_NORMAL;
0781 
0782     assert_spin_locked(&res->spinlock);
0783 
0784     if (res->state & (DLM_LOCK_RES_RECOVERING|
0785             DLM_LOCK_RES_RECOVERY_WAITING))
0786         status = DLM_RECOVERING;
0787     else if (res->state & DLM_LOCK_RES_MIGRATING)
0788         status = DLM_MIGRATING;
0789     else if (res->state & DLM_LOCK_RES_IN_PROGRESS)
0790         status = DLM_FORWARD;
0791 
0792     return status;
0793 }
0794 
0795 static inline u8 dlm_get_lock_cookie_node(u64 cookie)
0796 {
0797     u8 ret;
0798     cookie >>= 56;
0799     ret = (u8)(cookie & 0xffULL);
0800     return ret;
0801 }
0802 
0803 static inline unsigned long long dlm_get_lock_cookie_seq(u64 cookie)
0804 {
0805     unsigned long long ret;
0806     ret = ((unsigned long long)cookie) & 0x00ffffffffffffffULL;
0807     return ret;
0808 }
0809 
0810 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
0811                    struct dlm_lockstatus *lksb);
0812 void dlm_lock_get(struct dlm_lock *lock);
0813 void dlm_lock_put(struct dlm_lock *lock);
0814 
0815 void dlm_lock_attach_lockres(struct dlm_lock *lock,
0816                  struct dlm_lock_resource *res);
0817 
0818 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
0819                 void **ret_data);
0820 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
0821                  void **ret_data);
0822 int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
0823               void **ret_data);
0824 
0825 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
0826                 struct dlm_lock *lock);
0827 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
0828                  struct dlm_lock *lock);
0829 
0830 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
0831                 void **ret_data);
0832 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
0833                    struct dlm_lock *lock);
0834 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
0835                    struct dlm_lock *lock);
0836 
0837 int dlm_launch_thread(struct dlm_ctxt *dlm);
0838 void dlm_complete_thread(struct dlm_ctxt *dlm);
0839 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
0840 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
0841 void dlm_wait_for_recovery(struct dlm_ctxt *dlm);
0842 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
0843 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node);
0844 void dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout);
0845 void dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout);
0846 
0847 void dlm_put(struct dlm_ctxt *dlm);
0848 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm);
0849 int dlm_domain_fully_joined(struct dlm_ctxt *dlm);
0850 
0851 void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
0852                   struct dlm_lock_resource *res);
0853 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
0854                 struct dlm_lock_resource *res);
0855 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
0856 {
0857     /* This is called on every lookup, so it might be worth
0858      * inlining. */
0859     kref_get(&res->refs);
0860 }
0861 void dlm_lockres_put(struct dlm_lock_resource *res);
0862 void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
0863 void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
0864 struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
0865                              const char *name,
0866                              unsigned int len,
0867                              unsigned int hash);
0868 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
0869                         const char *name,
0870                         unsigned int len,
0871                         unsigned int hash);
0872 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
0873                           const char *name,
0874                           unsigned int len);
0875 
0876 int dlm_is_host_down(int errno);
0877 
0878 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
0879                          const char *lockid,
0880                          int namelen,
0881                          int flags);
0882 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
0883                       const char *name,
0884                       unsigned int namelen);
0885 
0886 void dlm_lockres_set_refmap_bit(struct dlm_ctxt *dlm,
0887                 struct dlm_lock_resource *res, int bit);
0888 void dlm_lockres_clear_refmap_bit(struct dlm_ctxt *dlm,
0889                   struct dlm_lock_resource *res, int bit);
0890 
0891 void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
0892                    struct dlm_lock_resource *res);
0893 void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
0894                    struct dlm_lock_resource *res);
0895 
0896 void __dlm_lockres_grab_inflight_worker(struct dlm_ctxt *dlm,
0897         struct dlm_lock_resource *res);
0898 
0899 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
0900 void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
0901 void __dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
0902 void dlm_do_local_ast(struct dlm_ctxt *dlm,
0903               struct dlm_lock_resource *res,
0904               struct dlm_lock *lock);
0905 int dlm_do_remote_ast(struct dlm_ctxt *dlm,
0906               struct dlm_lock_resource *res,
0907               struct dlm_lock *lock);
0908 void dlm_do_local_bast(struct dlm_ctxt *dlm,
0909                struct dlm_lock_resource *res,
0910                struct dlm_lock *lock,
0911                int blocked_type);
0912 int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm,
0913                struct dlm_lock_resource *res,
0914                struct dlm_lock *lock,
0915                int msg_type,
0916                int blocked_type, int flags);
0917 static inline int dlm_send_proxy_bast(struct dlm_ctxt *dlm,
0918                       struct dlm_lock_resource *res,
0919                       struct dlm_lock *lock,
0920                       int blocked_type)
0921 {
0922     return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_BAST,
0923                       blocked_type, 0);
0924 }
0925 
0926 static inline int dlm_send_proxy_ast(struct dlm_ctxt *dlm,
0927                      struct dlm_lock_resource *res,
0928                      struct dlm_lock *lock,
0929                      int flags)
0930 {
0931     return dlm_send_proxy_ast_msg(dlm, res, lock, DLM_AST,
0932                       0, flags);
0933 }
0934 
0935 void dlm_print_one_lock_resource(struct dlm_lock_resource *res);
0936 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res);
0937 
0938 void dlm_kick_thread(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
0939 void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
0940 
0941 
0942 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
0943 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
0944 
0945 int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
0946 int dlm_finish_migration(struct dlm_ctxt *dlm,
0947              struct dlm_lock_resource *res,
0948              u8 old_master);
0949 void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
0950                  struct dlm_lock_resource *res);
0951 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
0952 
0953 int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
0954                    void **ret_data);
0955 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
0956                   void **ret_data);
0957 void dlm_assert_master_post_handler(int status, void *data, void *ret_data);
0958 int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
0959                   void **ret_data);
0960 int dlm_deref_lockres_done_handler(struct o2net_msg *msg, u32 len, void *data,
0961                   void **ret_data);
0962 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
0963                 void **ret_data);
0964 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
0965                 void **ret_data);
0966 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
0967                    void **ret_data);
0968 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
0969                   void **ret_data);
0970 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
0971                    void **ret_data);
0972 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
0973                void **ret_data);
0974 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
0975                   void **ret_data);
0976 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
0977               u8 nodenum, u8 *real_master);
0978 
0979 void __dlm_do_purge_lockres(struct dlm_ctxt *dlm,
0980         struct dlm_lock_resource *res);
0981 
0982 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
0983                    struct dlm_lock_resource *res,
0984                    int ignore_higher,
0985                    u8 request_from,
0986                    u32 flags);
0987 
0988 
0989 int dlm_send_one_lockres(struct dlm_ctxt *dlm,
0990              struct dlm_lock_resource *res,
0991              struct dlm_migratable_lockres *mres,
0992              u8 send_to,
0993              u8 flags);
0994 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
0995                        struct dlm_lock_resource *res);
0996 
0997 /* will exit holding res->spinlock, but may drop in function */
0998 void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags);
0999 
1000 /* will exit holding res->spinlock, but may drop in function */
1001 static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
1002 {
1003     __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_IN_PROGRESS|
1004                           DLM_LOCK_RES_RECOVERING|
1005                       DLM_LOCK_RES_RECOVERY_WAITING|
1006                       DLM_LOCK_RES_MIGRATING));
1007 }
1008 
1009 void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
1010 void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
1011 
1012 /* create/destroy slab caches */
1013 int dlm_init_master_caches(void);
1014 void dlm_destroy_master_caches(void);
1015 
1016 int dlm_init_lock_cache(void);
1017 void dlm_destroy_lock_cache(void);
1018 
1019 int dlm_init_mle_cache(void);
1020 void dlm_destroy_mle_cache(void);
1021 
1022 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
1023 int dlm_drop_lockres_ref(struct dlm_ctxt *dlm,
1024              struct dlm_lock_resource *res);
1025 void dlm_clean_master_list(struct dlm_ctxt *dlm,
1026                u8 dead_node);
1027 void dlm_force_free_mles(struct dlm_ctxt *dlm);
1028 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
1029 int __dlm_lockres_has_locks(struct dlm_lock_resource *res);
1030 int __dlm_lockres_unused(struct dlm_lock_resource *res);
1031 
1032 static inline const char * dlm_lock_mode_name(int mode)
1033 {
1034     switch (mode) {
1035         case LKM_EXMODE:
1036             return "EX";
1037         case LKM_PRMODE:
1038             return "PR";
1039         case LKM_NLMODE:
1040             return "NL";
1041     }
1042     return "UNKNOWN";
1043 }
1044 
1045 
1046 static inline int dlm_lock_compatible(int existing, int request)
1047 {
1048     /* NO_LOCK compatible with all */
1049     if (request == LKM_NLMODE ||
1050         existing == LKM_NLMODE)
1051         return 1;
1052 
1053     /* EX incompatible with all non-NO_LOCK */
1054     if (request == LKM_EXMODE)
1055         return 0;
1056 
1057     /* request must be PR, which is compatible with PR */
1058     if (existing == LKM_PRMODE)
1059         return 1;
1060 
1061     return 0;
1062 }
1063 
1064 static inline int dlm_lock_on_list(struct list_head *head,
1065                    struct dlm_lock *lock)
1066 {
1067     struct dlm_lock *tmplock;
1068 
1069     list_for_each_entry(tmplock, head, list) {
1070         if (tmplock == lock)
1071             return 1;
1072     }
1073     return 0;
1074 }
1075 
1076 
1077 static inline enum dlm_status dlm_err_to_dlm_status(int err)
1078 {
1079     enum dlm_status ret;
1080     if (err == -ENOMEM)
1081         ret = DLM_SYSERR;
1082     else if (err == -ETIMEDOUT || o2net_link_down(err, NULL))
1083         ret = DLM_NOLOCKMGR;
1084     else if (err == -EINVAL)
1085         ret = DLM_BADPARAM;
1086     else if (err == -ENAMETOOLONG)
1087         ret = DLM_IVBUFLEN;
1088     else
1089         ret = DLM_BADARGS;
1090     return ret;
1091 }
1092 
1093 
1094 static inline void dlm_node_iter_init(unsigned long *map,
1095                       struct dlm_node_iter *iter)
1096 {
1097     memcpy(iter->node_map, map, sizeof(iter->node_map));
1098     iter->curnode = -1;
1099 }
1100 
1101 static inline int dlm_node_iter_next(struct dlm_node_iter *iter)
1102 {
1103     int bit;
1104     bit = find_next_bit(iter->node_map, O2NM_MAX_NODES, iter->curnode+1);
1105     if (bit >= O2NM_MAX_NODES) {
1106         iter->curnode = O2NM_MAX_NODES;
1107         return -ENOENT;
1108     }
1109     iter->curnode = bit;
1110     return bit;
1111 }
1112 
1113 static inline void dlm_set_lockres_owner(struct dlm_ctxt *dlm,
1114                      struct dlm_lock_resource *res,
1115                      u8 owner)
1116 {
1117     assert_spin_locked(&res->spinlock);
1118 
1119     res->owner = owner;
1120 }
1121 
1122 static inline void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
1123                         struct dlm_lock_resource *res,
1124                         u8 owner)
1125 {
1126     assert_spin_locked(&res->spinlock);
1127 
1128     if (owner != res->owner)
1129         dlm_set_lockres_owner(dlm, res, owner);
1130 }
1131 
1132 #endif /* DLMCOMMON_H */
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