/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: */ #ifndef _LUSTRE_DLM_H__ #define _LUSTRE_DLM_H__ #ifdef __KERNEL__ #include #include #define OBD_LDLM_DEVICENAME "ldlm" typedef enum { ELDLM_OK = 0, ELDLM_LOCK_CHANGED = 300, ELDLM_LOCK_ABORTED = 301, ELDLM_RESOURCE_FREED = 302, ELDLM_NAMESPACE_EXISTS = 400, ELDLM_BAD_NAMESPACE = 401 } ldlm_error_t; #define LDLM_NAMESPACE_SERVER 0 #define LDLM_NAMESPACE_CLIENT 1 #define LDLM_FL_LOCK_CHANGED (1 << 0) #define LDLM_FL_BLOCK_GRANTED (1 << 1) #define LDLM_FL_BLOCK_CONV (1 << 2) #define LDLM_FL_BLOCK_WAIT (1 << 3) #define LDLM_FL_CBPENDING (1 << 4) #define LDLM_FL_AST_SENT (1 << 5) #define LDLM_FL_DESTROYED (1 << 6) #define L2B(c) (1 << c) /* compatibility matrix */ #define LCK_COMPAT_EX L2B(LCK_NL) #define LCK_COMPAT_PW (LCK_COMPAT_EX | L2B(LCK_CR)) #define LCK_COMPAT_PR (LCK_COMPAT_PW | L2B(LCK_PR)) #define LCK_COMPAT_CW (LCK_COMPAT_PW | L2B(LCK_CW)) #define LCK_COMPAT_CR (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW)) #define LCK_COMPAT_NL (LCK_COMPAT_CR | L2B(LCK_EX)) static ldlm_mode_t lck_compat_array[] = { [LCK_EX] LCK_COMPAT_EX, [LCK_PW] LCK_COMPAT_PW, [LCK_PR] LCK_COMPAT_PR, [LCK_CW] LCK_COMPAT_CW, [LCK_CR] LCK_COMPAT_CR, [LCK_NL] LCK_COMPAT_NL }; static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new) { if (exist < LCK_EX || exist > LCK_NL) LBUG(); if (new < LCK_EX || new > LCK_NL) LBUG(); return (lck_compat_array[exist] & L2B(new)); } /* * * cluster name spaces * */ #define DLM_OST_NAMESPACE 1 #define DLM_MDS_NAMESPACE 2 /* XXX - do we just separate this by security domains and use a prefix for multiple namespaces in the same domain? - */ struct ldlm_namespace { char *ns_name; struct ptlrpc_client ns_rpc_client; /* used for revocation callbacks */ __u32 ns_client; /* is this a client-side lock tree? */ struct list_head *ns_hash; /* hash table for ns */ __u32 ns_refcount; /* count of resources in the hash */ struct list_head ns_root_list; /* all root resources in ns */ struct lustre_lock ns_lock; /* protects hash, refcount, list */ }; /* * * Resource hash table * */ #define RES_HASH_BITS 14 #define RES_HASH_SIZE (1UL << RES_HASH_BITS) #define RES_HASH_MASK (RES_HASH_SIZE - 1) struct ldlm_lock; typedef int (*ldlm_lock_callback)(struct lustre_handle *lockh, struct ldlm_lock_desc *new, void *data, __u32 data_len, struct ptlrpc_request **req); struct ldlm_lock { __u64 l_random; int l_refc; struct ldlm_resource *l_resource; struct ldlm_lock *l_parent; struct list_head l_children; struct list_head l_childof; struct list_head l_res_link; /*position in one of three res lists*/ atomic_t l_refcount; ldlm_mode_t l_req_mode; ldlm_mode_t l_granted_mode; ldlm_lock_callback l_completion_ast; ldlm_lock_callback l_blocking_ast; struct ptlrpc_connection *l_connection; struct ptlrpc_client *l_client; __u32 l_flags; struct lustre_handle l_remote_handle; void *l_data; __u32 l_data_len; void *l_cookie; int l_cookie_len; struct ldlm_extent l_extent; __u32 l_version[RES_VERSION_SIZE]; __u32 l_readers; __u32 l_writers; /* If the lock is granted, a process sleeps on this waitq to learn when * it's no longer in use. If the lock is not granted, a process sleeps * on this waitq to learn when it becomes granted. */ wait_queue_head_t l_waitq; }; typedef int (*ldlm_res_compat)(struct ldlm_lock *child, struct ldlm_lock *new); typedef int (*ldlm_res_policy)(struct ldlm_lock *lock, void *req_cookie, ldlm_mode_t mode, void *data); #define LDLM_PLAIN 10 #define LDLM_EXTENT 11 #define LDLM_MDSINTENT 12 #define LDLM_MIN_TYPE 10 #define LDLM_MAX_TYPE 12 extern ldlm_res_compat ldlm_res_compat_table []; extern ldlm_res_policy ldlm_res_policy_table []; struct ldlm_resource { struct ldlm_namespace *lr_namespace; struct list_head lr_hash; struct list_head lr_rootlink; /* link all root resources in NS */ struct ldlm_resource *lr_parent; /* 0 for a root resource */ struct list_head lr_children; /* list head for child resources */ struct list_head lr_childof; /* part of child list of parent */ struct list_head lr_granted; struct list_head lr_converting; struct list_head lr_waiting; ldlm_mode_t lr_most_restr; __u32 lr_type; /* PLAIN, EXTENT, or MDSINTENT */ struct ldlm_resource *lr_root; __u64 lr_name[RES_NAME_SIZE]; __u32 lr_version[RES_VERSION_SIZE]; atomic_t lr_refcount; void *lr_tmp; }; static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res) { return (struct ldlm_extent *)(res->lr_name); } extern struct obd_ops ldlm_obd_ops; #define LDLM_DEBUG(lock, format, a...) \ do { \ CDEBUG(D_DLMTRACE, "### " format \ " (%s: lock %p mode %d/%d on res %Lu (rc %d) " \ " type %d remote %Lx)\n" , ## a, \ lock->l_resource->lr_namespace->ns_name, lock, \ lock->l_granted_mode, lock->l_req_mode, \ lock->l_resource->lr_name[0], \ atomic_read(&lock->l_resource->lr_refcount), \ lock->l_resource->lr_type, \ lock->l_remote_handle.addr); \ } while (0) #define LDLM_DEBUG_NOLOCK(format, a...) \ CDEBUG(D_DLMTRACE, "### " format "\n" , ## a) /* ldlm_extent.c */ int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *); int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *); /* ldlm_lock.c */ void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh); struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle); void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh); void ldlm_lock_put(struct ldlm_lock *lock); void ldlm_lock_free(struct ldlm_lock *lock); void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc); void ldlm_lock_addref(struct ldlm_lock *lock, __u32 mode); void ldlm_lock_decref(struct ldlm_lock *lock, __u32 mode); void ldlm_grant_lock(struct ldlm_lock *lock); int ldlm_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type, void *cookie, int cookielen, ldlm_mode_t mode, struct lustre_handle *lockh); struct ldlm_lock * ldlm_lock_create(struct ldlm_namespace *ns, struct lustre_handle *parent_lock_handle, __u64 *res_id, __u32 type, ldlm_mode_t mode, void *data, __u32 data_len); ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock *lock, void *cookie, int cookie_len, int *flags, ldlm_lock_callback completion, ldlm_lock_callback blocking); struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode, int *flags); void ldlm_lock_cancel(struct ldlm_lock *lock); void ldlm_reprocess_all(struct ldlm_resource *res); void ldlm_lock_dump(struct ldlm_lock *lock); /* ldlm_test.c */ int ldlm_test(struct obd_device *device, struct ptlrpc_connection *conn); /* resource.c */ struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local); int ldlm_namespace_free(struct ldlm_namespace *ns); /* resource.c - internal */ struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent, __u64 *name, __u32 type, int create); struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res); int ldlm_resource_put(struct ldlm_resource *res); void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head, struct ldlm_lock *lock); void ldlm_resource_unlink_lock(struct ldlm_lock *lock); void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc); void ldlm_resource_dump(struct ldlm_resource *res); int ldlm_lock_change_resource(struct ldlm_lock *lock, __u64 new_resid[3]); /* ldlm_request.c */ int ldlm_cli_enqueue(struct ptlrpc_client *cl, struct ptlrpc_connection *peer, struct ptlrpc_request *req, struct ldlm_namespace *ns, struct lustre_handle *parent_lock_handle, __u64 *res_id, __u32 type, void *cookie, int cookielen, ldlm_mode_t mode, int *flags, ldlm_lock_callback callback, void *data, __u32 data_len, struct lustre_handle *lockh); int ldlm_cli_callback(struct lustre_handle *lockh, struct ldlm_lock_desc *new, void *data, __u32 data_len, struct ptlrpc_request **reqp); int ldlm_cli_convert(struct ptlrpc_client *, struct lustre_handle *, int new_mode, int *flags); int ldlm_cli_cancel(struct lustre_handle *); #endif /* __KERNEL__ */ /* ioctls for trying requests */ #define IOC_LDLM_TYPE 'f' #define IOC_LDLM_MIN_NR 40 #define IOC_LDLM_TEST _IOWR('f', 40, long) #define IOC_LDLM_MAX_NR 41 #endif