/****************************************************************************** ******************************************************************************* ** ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. ** ** This copyrighted material is made available to anyone wishing to use, ** modify, copy, or redistribute it subject to the terms and conditions ** of the GNU General Public License v.2. ** ******************************************************************************* ******************************************************************************/ #ifndef __DLM_INTERNAL_DOT_H__ #define __DLM_INTERNAL_DOT_H__ /* * This is the main header file to be included in each DLM source file. */ #include <linux/module.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/types.h> #include <linux/ctype.h> #include <linux/spinlock.h> #include <linux/vmalloc.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/random.h> #include <linux/delay.h> #include <linux/socket.h> #include <linux/kthread.h> #include <linux/kobject.h> #include <linux/kref.h> #include <linux/kernel.h> #include <linux/jhash.h> #include <linux/miscdevice.h> #include <linux/mutex.h> #include <linux/idr.h> #include <linux/ratelimit.h> #include <asm/uaccess.h> #include <linux/dlm.h> #include "config.h" /* Size of the temp buffer midcomms allocates on the stack. We try to make this large enough so most messages fit. FIXME: should sctp make this unnecessary? */ #define DLM_INBUF_LEN 148 struct dlm_ls; struct dlm_lkb; struct dlm_rsb; struct dlm_member; struct dlm_rsbtable; struct dlm_recover; struct dlm_header; struct dlm_message; struct dlm_rcom; struct dlm_mhandle; #define log_print(fmt, args...) \ printk(KERN_ERR "dlm: "fmt"\n" , ##args) #define log_error(ls, fmt, args...) \ printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) #define log_debug(ls, fmt, args...) \ do { \ if (dlm_config.ci_log_debug) \ printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ (ls)->ls_name , ##args); \ } while (0) #define log_limit(ls, fmt, args...) \ do { \ if (dlm_config.ci_log_debug) \ printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ (ls)->ls_name , ##args); \ } while (0) #define DLM_ASSERT(x, do) \ { \ if (!(x)) \ { \ printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ "DLM: assertion: \"%s\"\n" \ "DLM: time = %lu\n", \ __LINE__, __FILE__, #x, jiffies); \ {do} \ printk("\n"); \ BUG(); \ panic("DLM: Record message above and reboot.\n"); \ } \ } #define DLM_RTF_SHRINK 0x00000001 struct dlm_rsbtable { struct rb_root keep; struct rb_root toss; spinlock_t lock; uint32_t flags; }; /* * Lockspace member (per node in a ls) */ struct dlm_member { struct list_head list; int nodeid; int weight; int slot; int slot_prev; int comm_seq; uint32_t generation; }; /* * Save and manage recovery state for a lockspace. */ struct dlm_recover { struct list_head list; struct dlm_config_node *nodes; int nodes_count; uint64_t seq; }; /* * Pass input args to second stage locking function. */ struct dlm_args { uint32_t flags; void (*astfn) (void *astparam); void *astparam; void (*bastfn) (void *astparam, int mode); int mode; struct dlm_lksb *lksb; unsigned long timeout; }; /* * Lock block * * A lock can be one of three types: * * local copy lock is mastered locally * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) * process copy lock is mastered on a remote node * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) * master copy master node's copy of a lock owned by remote node * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) * * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or * dlm_unlock. The dlm does not modify these or use any private flags in * this field; it only contains DLM_LKF_ flags from dlm.h. These flags * are sent as-is to the remote master when the lock is remote. * * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. * Some internal flags are shared between the master and process nodes; * these shared flags are kept in the lower two bytes. One of these * flags set on the master copy will be propagated to the process copy * and v.v. Other internal flags are private to the master or process * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. * * lkb_sbflags: status block flags. These flags are copied directly into * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion * ast. All defined in dlm.h with DLM_SBF_ prefix. * * lkb_status: the lock status indicates which rsb queue the lock is * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT * * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a * reply is needed. Only set when the lkb is on the lockspace waiters * list awaiting a reply from a remote node. * * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb * is a master copy, nodeid specifies the remote lock holder, when the * lkb is a process copy, the nodeid specifies the lock master. */ /* lkb_status */ #define DLM_LKSTS_WAITING 1 #define DLM_LKSTS_GRANTED 2 #define DLM_LKSTS_CONVERT 3 /* lkb_flags */ #define DLM_IFL_MSTCPY 0x00010000 #define DLM_IFL_RESEND 0x00020000 #define DLM_IFL_DEAD 0x00040000 #define DLM_IFL_OVERLAP_UNLOCK 0x00080000 #define DLM_IFL_OVERLAP_CANCEL 0x00100000 #define DLM_IFL_ENDOFLIFE 0x00200000 #define DLM_IFL_WATCH_TIMEWARN 0x00400000 #define DLM_IFL_TIMEOUT_CANCEL 0x00800000 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000 #define DLM_IFL_STUB_MS 0x02000000 /* magic number for m_flags */ #define DLM_IFL_USER 0x00000001 #define DLM_IFL_ORPHAN 0x00000002 #define DLM_CALLBACKS_SIZE 6 #define DLM_CB_CAST 0x00000001 #define DLM_CB_BAST 0x00000002 #define DLM_CB_SKIP 0x00000004 struct dlm_callback { uint64_t seq; uint32_t flags; /* DLM_CBF_ */ int sb_status; /* copy to lksb status */ uint8_t sb_flags; /* copy to lksb flags */ int8_t mode; /* rq mode of bast, gr mode of cast */ }; struct dlm_lkb { struct dlm_rsb *lkb_resource; /* the rsb */ struct kref lkb_ref; int lkb_nodeid; /* copied from rsb */ int lkb_ownpid; /* pid of lock owner */ uint32_t lkb_id; /* our lock ID */ uint32_t lkb_remid; /* lock ID on remote partner */ uint32_t lkb_exflags; /* external flags from caller */ uint32_t lkb_sbflags; /* lksb flags */ uint32_t lkb_flags; /* internal flags */ uint32_t lkb_lvbseq; /* lvb sequence number */ int8_t lkb_status; /* granted, waiting, convert */ int8_t lkb_rqmode; /* requested lock mode */ int8_t lkb_grmode; /* granted lock mode */ int8_t lkb_highbast; /* highest mode bast sent for */ int8_t lkb_wait_type; /* type of reply waiting for */ int8_t lkb_wait_count; int lkb_wait_nodeid; /* for debugging */ struct list_head lkb_statequeue; /* rsb g/c/w list */ struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ struct list_head lkb_wait_reply; /* waiting for remote reply */ struct list_head lkb_ownqueue; /* list of locks for a process */ struct list_head lkb_time_list; ktime_t lkb_timestamp; ktime_t lkb_wait_time; unsigned long lkb_timeout_cs; struct mutex lkb_cb_mutex; struct work_struct lkb_cb_work; struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */ struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE]; struct dlm_callback lkb_last_cast; struct dlm_callback lkb_last_bast; ktime_t lkb_last_cast_time; /* for debugging */ ktime_t lkb_last_bast_time; /* for debugging */ uint64_t lkb_recover_seq; /* from ls_recover_seq */ char *lkb_lvbptr; struct dlm_lksb *lkb_lksb; /* caller's status block */ void (*lkb_astfn) (void *astparam); void (*lkb_bastfn) (void *astparam, int mode); union { void *lkb_astparam; /* caller's ast arg */ struct dlm_user_args *lkb_ua; }; }; /* * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real * nodeid, even when nodeid is our_nodeid. * * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, * greater than zero when another nodeid. * * (TODO: remove res_nodeid and only use res_master_nodeid) */ struct dlm_rsb { struct dlm_ls *res_ls; /* the lockspace */ struct kref res_ref; struct mutex res_mutex; unsigned long res_flags; int res_length; /* length of rsb name */ int res_nodeid; int res_master_nodeid; int res_dir_nodeid; int res_id; /* for ls_recover_idr */ uint32_t res_lvbseq; uint32_t res_hash; uint32_t res_bucket; /* rsbtbl */ unsigned long res_toss_time; uint32_t res_first_lkid; struct list_head res_lookup; /* lkbs waiting on first */ union { struct list_head res_hashchain; struct rb_node res_hashnode; /* rsbtbl */ }; struct list_head res_grantqueue; struct list_head res_convertqueue; struct list_head res_waitqueue; struct list_head res_root_list; /* used for recovery */ struct list_head res_recover_list; /* used for recovery */ int res_recover_locks_count; char *res_lvbptr; char res_name[DLM_RESNAME_MAXLEN+1]; }; /* dlm_master_lookup() flags */ #define DLM_LU_RECOVER_DIR 1 #define DLM_LU_RECOVER_MASTER 2 /* dlm_master_lookup() results */ #define DLM_LU_MATCH 1 #define DLM_LU_ADD 2 /* find_rsb() flags */ #define R_REQUEST 0x00000001 #define R_RECEIVE_REQUEST 0x00000002 #define R_RECEIVE_RECOVER 0x00000004 /* rsb_flags */ enum rsb_flags { RSB_MASTER_UNCERTAIN, RSB_VALNOTVALID, RSB_VALNOTVALID_PREV, RSB_NEW_MASTER, RSB_NEW_MASTER2, RSB_RECOVER_CONVERT, RSB_RECOVER_GRANT, RSB_RECOVER_LVB_INVAL, }; static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) { __set_bit(flag, &r->res_flags); } static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) { __clear_bit(flag, &r->res_flags); } static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) { return test_bit(flag, &r->res_flags); } /* dlm_header is first element of all structs sent between nodes */ #define DLM_HEADER_MAJOR 0x00030000 #define DLM_HEADER_MINOR 0x00000001 #define DLM_HEADER_SLOTS 0x00000001 #define DLM_MSG 1 #define DLM_RCOM 2 struct dlm_header { uint32_t h_version; uint32_t h_lockspace; uint32_t h_nodeid; /* nodeid of sender */ uint16_t h_length; uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ uint8_t h_pad; }; #define DLM_MSG_REQUEST 1 #define DLM_MSG_CONVERT 2 #define DLM_MSG_UNLOCK 3 #define DLM_MSG_CANCEL 4 #define DLM_MSG_REQUEST_REPLY 5 #define DLM_MSG_CONVERT_REPLY 6 #define DLM_MSG_UNLOCK_REPLY 7 #define DLM_MSG_CANCEL_REPLY 8 #define DLM_MSG_GRANT 9 #define DLM_MSG_BAST 10 #define DLM_MSG_LOOKUP 11 #define DLM_MSG_REMOVE 12 #define DLM_MSG_LOOKUP_REPLY 13 #define DLM_MSG_PURGE 14 struct dlm_message { struct dlm_header m_header; uint32_t m_type; /* DLM_MSG_ */ uint32_t m_nodeid; uint32_t m_pid; uint32_t m_lkid; /* lkid on sender */ uint32_t m_remid; /* lkid on receiver */ uint32_t m_parent_lkid; uint32_t m_parent_remid; uint32_t m_exflags; uint32_t m_sbflags; uint32_t m_flags; uint32_t m_lvbseq; uint32_t m_hash; int m_status; int m_grmode; int m_rqmode; int m_bastmode; int m_asts; int m_result; /* 0 or -EXXX */ char m_extra[0]; /* name or lvb */ }; #define DLM_RS_NODES 0x00000001 #define DLM_RS_NODES_ALL 0x00000002 #define DLM_RS_DIR 0x00000004 #define DLM_RS_DIR_ALL 0x00000008 #define DLM_RS_LOCKS 0x00000010 #define DLM_RS_LOCKS_ALL 0x00000020 #define DLM_RS_DONE 0x00000040 #define DLM_RS_DONE_ALL 0x00000080 #define DLM_RCOM_STATUS 1 #define DLM_RCOM_NAMES 2 #define DLM_RCOM_LOOKUP 3 #define DLM_RCOM_LOCK 4 #define DLM_RCOM_STATUS_REPLY 5 #define DLM_RCOM_NAMES_REPLY 6 #define DLM_RCOM_LOOKUP_REPLY 7 #define DLM_RCOM_LOCK_REPLY 8 struct dlm_rcom { struct dlm_header rc_header; uint32_t rc_type; /* DLM_RCOM_ */ int rc_result; /* multi-purpose */ uint64_t rc_id; /* match reply with request */ uint64_t rc_seq; /* sender's ls_recover_seq */ uint64_t rc_seq_reply; /* remote ls_recover_seq */ char rc_buf[0]; }; union dlm_packet { struct dlm_header header; /* common to other two */ struct dlm_message message; struct dlm_rcom rcom; }; #define DLM_RSF_NEED_SLOTS 0x00000001 /* RCOM_STATUS data */ struct rcom_status { __le32 rs_flags; __le32 rs_unused1; __le64 rs_unused2; }; /* RCOM_STATUS_REPLY data */ struct rcom_config { __le32 rf_lvblen; __le32 rf_lsflags; /* DLM_HEADER_SLOTS adds: */ __le32 rf_flags; __le16 rf_our_slot; __le16 rf_num_slots; __le32 rf_generation; __le32 rf_unused1; __le64 rf_unused2; }; struct rcom_slot { __le32 ro_nodeid; __le16 ro_slot; __le16 ro_unused1; __le64 ro_unused2; }; struct rcom_lock { __le32 rl_ownpid; __le32 rl_lkid; __le32 rl_remid; __le32 rl_parent_lkid; __le32 rl_parent_remid; __le32 rl_exflags; __le32 rl_flags; __le32 rl_lvbseq; __le32 rl_result; int8_t rl_rqmode; int8_t rl_grmode; int8_t rl_status; int8_t rl_asts; __le16 rl_wait_type; __le16 rl_namelen; char rl_name[DLM_RESNAME_MAXLEN]; char rl_lvb[0]; }; /* * The max number of resources per rsbtbl bucket that shrink will attempt * to remove in each iteration. */ #define DLM_REMOVE_NAMES_MAX 8 struct dlm_ls { struct list_head ls_list; /* list of lockspaces */ dlm_lockspace_t *ls_local_handle; uint32_t ls_global_id; /* global unique lockspace ID */ uint32_t ls_generation; uint32_t ls_exflags; int ls_lvblen; int ls_count; /* refcount of processes in the dlm using this ls */ int ls_create_count; /* create/release refcount */ unsigned long ls_flags; /* LSFL_ */ unsigned long ls_scan_time; struct kobject ls_kobj; struct idr ls_lkbidr; spinlock_t ls_lkbidr_spin; struct dlm_rsbtable *ls_rsbtbl; uint32_t ls_rsbtbl_size; struct mutex ls_waiters_mutex; struct list_head ls_waiters; /* lkbs needing a reply */ struct mutex ls_orphans_mutex; struct list_head ls_orphans; struct mutex ls_timeout_mutex; struct list_head ls_timeout; spinlock_t ls_new_rsb_spin; int ls_new_rsb_count; struct list_head ls_new_rsb; /* new rsb structs */ spinlock_t ls_remove_spin; char ls_remove_name[DLM_RESNAME_MAXLEN+1]; char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; int ls_remove_len; int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; struct list_head ls_nodes; /* current nodes in ls */ struct list_head ls_nodes_gone; /* dead node list, recovery */ int ls_num_nodes; /* number of nodes in ls */ int ls_low_nodeid; int ls_total_weight; int *ls_node_array; int ls_slot; int ls_num_slots; int ls_slots_size; struct dlm_slot *ls_slots; struct dlm_rsb ls_stub_rsb; /* for returning errors */ struct dlm_lkb ls_stub_lkb; /* for returning errors */ struct dlm_message ls_stub_ms; /* for faking a reply */ struct dentry *ls_debug_rsb_dentry; /* debugfs */ struct dentry *ls_debug_waiters_dentry; /* debugfs */ struct dentry *ls_debug_locks_dentry; /* debugfs */ struct dentry *ls_debug_all_dentry; /* debugfs */ struct dentry *ls_debug_toss_dentry; /* debugfs */ wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ int ls_uevent_result; struct completion ls_members_done; int ls_members_result; struct miscdevice ls_device; struct workqueue_struct *ls_callback_wq; /* recovery related */ struct mutex ls_cb_mutex; struct list_head ls_cb_delay; /* save for queue_work later */ struct timer_list ls_timer; struct task_struct *ls_recoverd_task; struct mutex ls_recoverd_active; spinlock_t ls_recover_lock; unsigned long ls_recover_begin; /* jiffies timestamp */ uint32_t ls_recover_status; /* DLM_RS_ */ uint64_t ls_recover_seq; struct dlm_recover *ls_recover_args; struct rw_semaphore ls_in_recovery; /* block local requests */ struct rw_semaphore ls_recv_active; /* block dlm_recv */ struct list_head ls_requestqueue;/* queue remote requests */ struct mutex ls_requestqueue_mutex; struct dlm_rcom *ls_recover_buf; int ls_recover_nodeid; /* for debugging */ unsigned int ls_recover_dir_sent_res; /* for log info */ unsigned int ls_recover_dir_sent_msg; /* for log info */ unsigned int ls_recover_locks_in; /* for log info */ uint64_t ls_rcom_seq; spinlock_t ls_rcom_spin; struct list_head ls_recover_list; spinlock_t ls_recover_list_lock; int ls_recover_list_count; struct idr ls_recover_idr; spinlock_t ls_recover_idr_lock; wait_queue_head_t ls_wait_general; wait_queue_head_t ls_recover_lock_wait; struct mutex ls_clear_proc_locks; struct list_head ls_root_list; /* root resources */ struct rw_semaphore ls_root_sem; /* protect root_list */ const struct dlm_lockspace_ops *ls_ops; void *ls_ops_arg; int ls_namelen; char ls_name[1]; }; /* * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines * that they should abort what they're doing so new recovery can be started. * * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it * should do down_write() on the in_recovery rw_semaphore. (doing down_write * within dlm_ls_stop causes complaints about the lock acquired/released * in different contexts.) * * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. * It sets this after it is done with down_write() on the in_recovery * rw_semaphore and clears it after it has released the rw_semaphore. * * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it * should begin recovery of the lockspace. * * LSFL_RUNNING - set when normal locking activity is enabled. * dlm_ls_stop() clears this to tell dlm locking routines that they should * quit what they are doing so recovery can run. dlm_recoverd sets * this after recovery is finished. */ #define LSFL_RECOVER_STOP 0 #define LSFL_RECOVER_DOWN 1 #define LSFL_RECOVER_LOCK 2 #define LSFL_RECOVER_WORK 3 #define LSFL_RUNNING 4 #define LSFL_RCOM_READY 5 #define LSFL_RCOM_WAIT 6 #define LSFL_UEVENT_WAIT 7 #define LSFL_TIMEWARN 8 #define LSFL_CB_DELAY 9 #define LSFL_NODIR 10 /* much of this is just saving user space pointers associated with the lock that we pass back to the user lib with an ast */ struct dlm_user_args { struct dlm_user_proc *proc; /* each process that opens the lockspace device has private data (dlm_user_proc) on the struct file, the process's locks point back to it*/ struct dlm_lksb lksb; struct dlm_lksb __user *user_lksb; void __user *castparam; void __user *castaddr; void __user *bastparam; void __user *bastaddr; uint64_t xid; }; #define DLM_PROC_FLAGS_CLOSING 1 #define DLM_PROC_FLAGS_COMPAT 2 /* locks list is kept so we can remove all a process's locks when it exits (or orphan those that are persistent) */ struct dlm_user_proc { dlm_lockspace_t *lockspace; unsigned long flags; /* DLM_PROC_FLAGS */ struct list_head asts; spinlock_t asts_spin; struct list_head locks; spinlock_t locks_spin; struct list_head unlocking; wait_queue_head_t wait; }; static inline int dlm_locking_stopped(struct dlm_ls *ls) { return !test_bit(LSFL_RUNNING, &ls->ls_flags); } static inline int dlm_recovery_stopped(struct dlm_ls *ls) { return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); } static inline int dlm_no_directory(struct dlm_ls *ls) { return test_bit(LSFL_NODIR, &ls->ls_flags); } int dlm_netlink_init(void); void dlm_netlink_exit(void); void dlm_timeout_warn(struct dlm_lkb *lkb); int dlm_plock_init(void); void dlm_plock_exit(void); #ifdef CONFIG_DLM_DEBUG int dlm_register_debugfs(void); void dlm_unregister_debugfs(void); int dlm_create_debug_file(struct dlm_ls *ls); void dlm_delete_debug_file(struct dlm_ls *ls); #else static inline int dlm_register_debugfs(void) { return 0; } static inline void dlm_unregister_debugfs(void) { } static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; } static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } #endif #endif /* __DLM_INTERNAL_DOT_H__ */