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Diffstat (limited to 'fs/dlm/dlm_internal.h')
| -rw-r--r-- | fs/dlm/dlm_internal.h | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h new file mode 100644 index 00000000000000..1e5cd67e1b7ad2 --- /dev/null +++ b/fs/dlm/dlm_internal.h @@ -0,0 +1,543 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 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 <asm/semaphore.h> +#include <asm/uaccess.h> + +#include <linux/dlm.h> + +#define DLM_LOCKSPACE_LEN 64 + +/* 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_lkbtable; +struct dlm_rsbtable; +struct dlm_dirtable; +struct dlm_direntry; +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 DLM_LOG_DEBUG +#ifdef DLM_LOG_DEBUG +#define log_debug(ls, fmt, args...) log_error(ls, fmt, ##args) +#else +#define log_debug(ls, fmt, args...) +#endif + +#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_FAKE_USER_AST ERR_PTR(-EINVAL) + + +struct dlm_direntry { + struct list_head list; + uint32_t master_nodeid; + uint16_t length; + char name[1]; +}; + +struct dlm_dirtable { + struct list_head list; + rwlock_t lock; +}; + +struct dlm_rsbtable { + struct list_head list; + struct list_head toss; + rwlock_t lock; +}; + +struct dlm_lkbtable { + struct list_head list; + rwlock_t lock; + uint16_t counter; +}; + +/* + * Lockspace member (per node in a ls) + */ + +struct dlm_member { + struct list_head list; + int nodeid; + int weight; +}; + +/* + * Save and manage recovery state for a lockspace. + */ + +struct dlm_recover { + struct list_head list; + int *nodeids; + int node_count; + uint64_t seq; +}; + +/* + * Pass input args to second stage locking function. + */ + +struct dlm_args { + uint32_t flags; + void *astaddr; + long astparam; + void *bastaddr; + int mode; + struct dlm_lksb *lksb; +}; + + +/* + * 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_ast_type */ + +#define AST_COMP 1 +#define AST_BAST 2 + +/* 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_USER 0x00000001 +#define DLM_IFL_ORPHAN 0x00000002 + +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_bastmode; /* requested mode */ + int8_t lkb_highbast; /* highest mode bast sent for */ + + int8_t lkb_wait_type; /* type of reply waiting for */ + int8_t lkb_ast_type; /* type of ast queued for */ + + struct list_head lkb_idtbl_list; /* lockspace lkbtbl */ + 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_astqueue; /* need ast to be sent */ + struct list_head lkb_ownqueue; /* list of locks for a process */ + + char *lkb_lvbptr; + struct dlm_lksb *lkb_lksb; /* caller's status block */ + void *lkb_astaddr; /* caller's ast function */ + void *lkb_bastaddr; /* caller's bast function */ + long lkb_astparam; /* caller's ast arg */ +}; + + +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; + 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 */ + struct list_head res_hashchain; /* 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[1]; +}; + +/* find_rsb() flags */ + +#define R_MASTER 1 /* only return rsb if it's a master */ +#define R_CREATE 2 /* create/add rsb if not found */ + +/* rsb_flags */ + +enum rsb_flags { + RSB_MASTER_UNCERTAIN, + RSB_VALNOTVALID, + RSB_VALNOTVALID_PREV, + RSB_NEW_MASTER, + RSB_NEW_MASTER2, + RSB_RECOVER_CONVERT, + RSB_LOCKS_PURGED, +}; + +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 0x00020000 +#define DLM_HEADER_MINOR 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 + +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 */ + char rc_buf[0]; +}; + +struct rcom_config { + uint32_t rf_lvblen; + uint32_t rf_lsflags; + uint64_t rf_unused; +}; + +struct rcom_lock { + uint32_t rl_ownpid; + uint32_t rl_lkid; + uint32_t rl_remid; + uint32_t rl_parent_lkid; + uint32_t rl_parent_remid; + uint32_t rl_exflags; + uint32_t rl_flags; + uint32_t rl_lvbseq; + int rl_result; + int8_t rl_rqmode; + int8_t rl_grmode; + int8_t rl_status; + int8_t rl_asts; + uint16_t rl_wait_type; + uint16_t rl_namelen; + char rl_name[DLM_RESNAME_MAXLEN]; + char rl_lvb[0]; +}; + +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_exflags; + int ls_lvblen; + int ls_count; /* reference count */ + unsigned long ls_flags; /* LSFL_ */ + struct kobject ls_kobj; + + struct dlm_rsbtable *ls_rsbtbl; + uint32_t ls_rsbtbl_size; + + struct dlm_lkbtable *ls_lkbtbl; + uint32_t ls_lkbtbl_size; + + struct dlm_dirtable *ls_dirtbl; + uint32_t ls_dirtbl_size; + + struct mutex ls_waiters_mutex; + struct list_head ls_waiters; /* lkbs needing a reply */ + + 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; + + 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 */ + + wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ + int ls_uevent_result; + + struct miscdevice ls_device; + + /* recovery related */ + + struct timer_list ls_timer; + struct task_struct *ls_recoverd_task; + struct mutex ls_recoverd_active; + spinlock_t ls_recover_lock; + 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 list_head ls_requestqueue;/* queue remote requests */ + struct mutex ls_requestqueue_mutex; + char *ls_recover_buf; + int ls_recover_nodeid; /* for debugging */ + uint64_t ls_rcom_seq; + struct list_head ls_recover_list; + spinlock_t ls_recover_list_lock; + int ls_recover_list_count; + wait_queue_head_t ls_wait_general; + struct mutex ls_clear_proc_locks; + + struct list_head ls_root_list; /* root resources */ + struct rw_semaphore ls_root_sem; /* protect root_list */ + + int ls_namelen; + char ls_name[1]; +}; + +#define LSFL_WORK 0 +#define LSFL_RUNNING 1 +#define LSFL_RECOVERY_STOP 2 +#define LSFL_RCOM_READY 3 +#define LSFL_UEVENT_WAIT 4 + +/* 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; + int old_mode; + int update_user_lvb; + struct dlm_lksb __user *user_lksb; + void __user *castparam; + void __user *castaddr; + void __user *bastparam; + void __user *bastaddr; +}; + +#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; + 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_RECOVERY_STOP, &ls->ls_flags); +} + +static inline int dlm_no_directory(struct dlm_ls *ls) +{ + return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0; +} + +#endif /* __DLM_INTERNAL_DOT_H__ */ + |