db.in

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#define	DB_LOCK_SWITCH		0x020	/* Internal: switch existing lock. */
#define	DB_LOCK_UPGRADE		0x040	/* Internal: upgrade existing lock. */

/*
 * Simple R/W lock modes and for multi-granularity intention locking.
 *
 * !!!
 * These values are NOT random, as they are used as an index into the lock
 * conflicts arrays, i.e., DB_LOCK_IWRITE must be == 3, and DB_LOCK_IREAD
 * must be == 4.
 */
typedef enum {
	DB_LOCK_NG=0,			/* Not granted. */
	DB_LOCK_READ=1,			/* Shared/read. */
	DB_LOCK_WRITE=2,		/* Exclusive/write. */
	DB_LOCK_WAIT=3,			/* Wait for event */
	DB_LOCK_IWRITE=4,		/* Intent exclusive/write. */
	DB_LOCK_IREAD=5,		/* Intent to share/read. */
	DB_LOCK_IWR=6,			/* Intent to read and write. */
	DB_LOCK_DIRTY=7,		/* Dirty Read. */
	DB_LOCK_WWRITE=8		/* Was Written. */
} db_lockmode_t;

/*
 * Request types.
 */
typedef enum {
	DB_LOCK_DUMP=0,			/* Display held locks. */
	DB_LOCK_GET=1,			/* Get the lock. */
	DB_LOCK_GET_TIMEOUT=2,		/* Get lock with a timeout. */
	DB_LOCK_INHERIT=3,		/* Pass locks to parent. */
	DB_LOCK_PUT=4,			/* Release the lock. */
	DB_LOCK_PUT_ALL=5,		/* Release locker's locks. */
	DB_LOCK_PUT_OBJ=6,		/* Release locker's locks on obj. */
	DB_LOCK_PUT_READ=7,		/* Release locker's read locks. */
	DB_LOCK_TIMEOUT=8,		/* Force a txn to timeout. */
	DB_LOCK_TRADE=9,		/* Trade locker ids on a lock. */
	DB_LOCK_UPGRADE_WRITE=10	/* Upgrade writes for dirty reads. */
} db_lockop_t;

/*
 * Status of a lock.
 */
typedef enum  {
	DB_LSTAT_ABORTED=1,		/* Lock belongs to an aborted txn. */
	DB_LSTAT_ERR=2,			/* Lock is bad. */
	DB_LSTAT_EXPIRED=3,		/* Lock has expired. */
	DB_LSTAT_FREE=4,		/* Lock is unallocated. */
	DB_LSTAT_HELD=5,		/* Lock is currently held. */
	DB_LSTAT_NOTEXIST=6,		/* Object on which lock was waiting
					 * was removed */
	DB_LSTAT_PENDING=7,		/* Lock was waiting and has been
					 * promoted; waiting for the owner
					 * to run and upgrade it to held. */
	DB_LSTAT_WAITING=8		/* Lock is on the wait queue. */
}db_status_t;

/* Lock statistics structure. */
struct __db_lock_stat {
	u_int32_t st_id;		/* Last allocated locker ID. */
	u_int32_t st_cur_maxid;		/* Current maximum unused ID. */
	u_int32_t st_maxlocks;		/* Maximum number of locks in table. */
	u_int32_t st_maxlockers;	/* Maximum num of lockers in table. */
	u_int32_t st_maxobjects;	/* Maximum num of objects in table. */
	u_int32_t st_nmodes;		/* Number of lock modes. */
	u_int32_t st_nlocks;		/* Current number of locks. */
	u_int32_t st_maxnlocks;		/* Maximum number of locks so far. */
	u_int32_t st_nlockers;		/* Current number of lockers. */
	u_int32_t st_maxnlockers;	/* Maximum number of lockers so far. */
	u_int32_t st_nobjects;		/* Current number of objects. */
	u_int32_t st_maxnobjects;	/* Maximum number of objects so far. */
	u_int32_t st_nconflicts;	/* Number of lock conflicts. */
	u_int32_t st_nrequests;		/* Number of lock gets. */
	u_int32_t st_nreleases;		/* Number of lock puts. */
	u_int32_t st_nnowaits;		/* Number of requests that would have
					   waited, but NOWAIT was set. */
	u_int32_t st_ndeadlocks;	/* Number of lock deadlocks. */
	db_timeout_t st_locktimeout;	/* Lock timeout. */
	u_int32_t st_nlocktimeouts;	/* Number of lock timeouts. */
	db_timeout_t st_txntimeout;	/* Transaction timeout. */
	u_int32_t st_ntxntimeouts;	/* Number of transaction timeouts. */
	u_int32_t st_region_wait;	/* Region lock granted after wait. */
	u_int32_t st_region_nowait;	/* Region lock granted without wait. */
	u_int32_t st_regsize;		/* Region size. */
};

/*
 * DB_LOCK_ILOCK --
 *	Internal DB access method lock.
 */
struct __db_ilock {
	db_pgno_t pgno;			/* Page being locked. */
	u_int8_t fileid[DB_FILE_ID_LEN];/* File id. */
#define	DB_HANDLE_LOCK	1
#define	DB_RECORD_LOCK	2
#define	DB_PAGE_LOCK	3
#define	DB_TXN_LOCK	4
	u_int32_t type;			/* Type of lock. */
};

/*
 * DB_LOCK --
 *	The structure is allocated by the caller and filled in during a
 *	lock_get request (or a lock_vec/DB_LOCK_GET).
 */
struct __db_lock_u {
	size_t		off;		/* Offset of the lock in the region */
	u_int32_t	ndx;		/* Index of the object referenced by
					 * this lock; used for locking. */
	u_int32_t	gen;		/* Generation number of this lock. */
	db_lockmode_t	mode;		/* mode of this lock. */
};

/* Lock request structure. */
struct __db_lockreq {
	db_lockop_t	 op;		/* Operation. */
	db_lockmode_t	 mode;		/* Requested mode. */
	db_timeout_t	 timeout;	/* Time to expire lock. */
	DBT		*obj;		/* Object being locked. */
	DB_LOCK		 lock;		/* Lock returned. */
};

/*******************************************************
 * Logging.
 *******************************************************/
#define	DB_LOGVERSION	7		/* Current log version. */
#define	DB_LOGOLDVER	7		/* Oldest log version supported. */
#define	DB_LOGMAGIC	0x040988

/* Flag values for log_archive(). */
#define	DB_ARCH_ABS		0x001	/* Absolute pathnames. */
#define	DB_ARCH_DATA		0x002	/* Data files. */
#define	DB_ARCH_LOG		0x004	/* Log files. */

/*
 * A DB_LSN has two parts, a fileid which identifies a specific file, and an
 * offset within that file.  The fileid is an unsigned 4-byte quantity that
 * uniquely identifies a file within the log directory -- currently a simple
 * counter inside the log.  The offset is also an unsigned 4-byte value.  The
 * log manager guarantees the offset is never more than 4 bytes by switching
 * to a new log file before the maximum length imposed by an unsigned 4-byte
 * offset is reached.
 */
struct __db_lsn {
	u_int32_t	file;		/* File ID. */
	u_int32_t	offset;		/* File offset. */
};

/*
 * DB_LOGC --
 *	Log cursor.
 */
struct __db_log_cursor {
	DB_ENV	 *dbenv;		/* Enclosing dbenv. */

	DB_FH	 *c_fh;			/* File handle. */
	DB_LSN	  c_lsn;		/* Cursor: LSN */
	u_int32_t c_len;		/* Cursor: record length */
	u_int32_t c_prev;		/* Cursor: previous record's offset */

	DBT	  c_dbt;		/* Return DBT. */

#define	DB_LOGC_BUF_SIZE	(32 * 1024)
	u_int8_t *bp;			/* Allocated read buffer. */
	u_int32_t bp_size;		/* Read buffer length in bytes. */
	u_int32_t bp_rlen;		/* Read buffer valid data length. */
	DB_LSN	  bp_lsn;		/* Read buffer first byte LSN. */

	u_int32_t bp_maxrec;		/* Max record length in the log file. */

					/* Methods. */
	int (*close) __P((DB_LOGC *, u_int32_t));
	int (*get) __P((DB_LOGC *, DB_LSN *, DBT *, u_int32_t));

#define	DB_LOG_DISK		0x01	/* Log record came from disk. */
#define	DB_LOG_LOCKED		0x02	/* Log region already locked */
#define	DB_LOG_SILENT_ERR	0x04	/* Turn-off error messages. */
	u_int32_t flags;
};

/* Log statistics structure. */
struct __db_log_stat {
	u_int32_t st_magic;		/* Log file magic number. */
	u_int32_t st_version;		/* Log file version number. */
	int st_mode;			/* Log file mode. */
	u_int32_t st_lg_bsize;		/* Log buffer size. */
	u_int32_t st_lg_size;		/* Log file size. */
	u_int32_t st_w_bytes;		/* Bytes to log. */
	u_int32_t st_w_mbytes;		/* Megabytes to log. */
	u_int32_t st_wc_bytes;		/* Bytes to log since checkpoint. */
	u_int32_t st_wc_mbytes;		/* Megabytes to log since checkpoint. */
	u_int32_t st_wcount;		/* Total writes to the log. */
	u_int32_t st_wcount_fill;	/* Overflow writes to the log. */
	u_int32_t st_scount;		/* Total syncs to the log. */
	u_int32_t st_region_wait;	/* Region lock granted after wait. */
	u_int32_t st_region_nowait;	/* Region lock granted without wait. */
	u_int32_t st_cur_file;		/* Current log file number. */
	u_int32_t st_cur_offset;	/* Current log file offset. */
	u_int32_t st_disk_file;		/* Known on disk log file number. */
	u_int32_t st_disk_offset;	/* Known on disk log file offset. */
	u_int32_t st_regsize;		/* Region size. */
	u_int32_t st_maxcommitperflush;	/* Max number of commits in a flush. */
	u_int32_t st_mincommitperflush;	/* Min number of commits in a flush. */
};

/*******************************************************
 * Shared buffer cache (mpool).
 *******************************************************/
/* Flag values for DB_MPOOLFILE->get. */
#define	DB_MPOOL_CREATE		0x001	/* Create a page. */
#define	DB_MPOOL_LAST		0x002	/* Return the last page. */
#define	DB_MPOOL_NEW		0x004	/* Create a new page. */

/* Flag values for DB_MPOOLFILE->put, DB_MPOOLFILE->set. */
#define	DB_MPOOL_CLEAN		0x001	/* Page is not modified. */
#define	DB_MPOOL_DIRTY		0x002	/* Page is modified. */
#define	DB_MPOOL_DISCARD	0x004	/* Don't cache the page. */

/* Priority values for DB_MPOOLFILE->set_priority. */
typedef enum {
	DB_PRIORITY_VERY_LOW=1,
	DB_PRIORITY_LOW=2,
	DB_PRIORITY_DEFAULT=3,
	DB_PRIORITY_HIGH=4,
	DB_PRIORITY_VERY_HIGH=5
} DB_CACHE_PRIORITY;

/* Per-process DB_MPOOLFILE information. */
struct __db_mpoolfile {
	/* These fields need to be protected for multi-threaded support. */
	DB_MUTEX *mutexp;		/* Structure thread lock. */

	DB_FH	  *fhp;			/* Underlying file handle. */

	u_int32_t  ref;			/* Reference count. */

	/*
	 * !!!
	 * The pinref and q fields are protected by the region lock, not the
	 * DB_MPOOLFILE structure mutex.  We don't use the structure mutex
	 * because then I/O (which holds the structure lock held because of
	 * the race between the seek and write of the file descriptor) would
	 * block any other put/get calls using this DB_MPOOLFILE structure.
	 */
	u_int32_t pinref;		/* Pinned block reference count. */

	/*
	 * !!!
	 * Explicit representations of structures from queue.h.
	 * TAILQ_ENTRY(__db_mpoolfile) q;
	 */
	struct {
		struct __db_mpoolfile *tqe_next;
		struct __db_mpoolfile **tqe_prev;
	} q;				/* Linked list of DB_MPOOLFILE's. */

	/*
	 * These fields are not thread-protected because they are initialized
	 * when the file is opened and never modified.
	 */
	int	  ftype;		/* File type. */
	DBT	 *pgcookie;		/* Byte-string passed to pgin/pgout. */
	u_int8_t *fileid;		/* Unique file ID. */
	int32_t	  lsn_offset;		/* LSN offset in page. */
	u_int32_t clear_len;		/* Cleared length on created pages. */

	DB_MPOOL  *dbmp;		/* Overlying DB_MPOOL. */
	MPOOLFILE *mfp;			/* Underlying MPOOLFILE. */

	void	  *addr;		/* Address of mmap'd region. */
	size_t	   len;			/* Length of mmap'd region. */

					/* Methods. */
	int  (*close) __P((DB_MPOOLFILE *, u_int32_t));
	int  (*get) __P((DB_MPOOLFILE *, db_pgno_t *, u_int32_t, void *));
	void (*get_fileid) __P((DB_MPOOLFILE *, u_int8_t *));
	void (*last_pgno) __P((DB_MPOOLFILE *, db_pgno_t *));
	int  (*open)__P((DB_MPOOLFILE *, const char *, u_int32_t, int, size_t));
	int  (*put) __P((DB_MPOOLFILE *, void *, u_int32_t));
	void (*refcnt) __P((DB_MPOOLFILE *, db_pgno_t *));
	int  (*set) __P((DB_MPOOLFILE *, void *, u_int32_t));
	int  (*set_clear_len) __P((DB_MPOOLFILE *, u_int32_t));
	int  (*set_fileid) __P((DB_MPOOLFILE *, u_int8_t *));
	int  (*set_ftype) __P((DB_MPOOLFILE *, int));
	int  (*set_lsn_offset) __P((DB_MPOOLFILE *, int32_t));
	int  (*set_pgcookie) __P((DB_MPOOLFILE *, DBT *));
	int  (*set_priority) __P((DB_MPOOLFILE *, DB_CACHE_PRIORITY));
	void (*set_unlink) __P((DB_MPOOLFILE *, int));
	int  (*sync) __P((DB_MPOOLFILE *));

	/*
	 * MP_OPEN_CALLED and MP_READONLY do not need to be thread protected
	 * because they are initialized when the file is opened, and never
	 * modified.
	 *
	 * MP_FLUSH, MP_UPGRADE and MP_UPGRADE_FAIL are thread protected
	 * becase they are potentially read by multiple threads of control.
	 */
#define	MP_FLUSH	0x001		/* Was opened to flush a buffer. */
#define	MP_OPEN_CALLED	0x002		/* File opened. */
#define	MP_READONLY	0x004		/* File is readonly. */
#define	MP_UPGRADE	0x008		/* File descriptor is readwrite. */
#define	MP_UPGRADE_FAIL	0x010		/* Upgrade wasn't possible. */
	u_int32_t  flags;
};

/*
 * Mpool statistics structure.
 */
struct __db_mpool_stat {
	u_int32_t st_gbytes;		/* Total cache size: GB. */
	u_int32_t st_bytes;		/* Total cache size: B. */
	u_int32_t st_ncache;		/* Number of caches. */
	u_int32_t st_regsize;		/* Cache size. */
	u_int32_t st_map;		/* Pages from mapped files. */
	u_int32_t st_cache_hit;		/* Pages found in the cache. */
	u_int32_t st_cache_miss;	/* Pages not found in the cache. */
	u_int32_t st_page_create;	/* Pages created in the cache. */
	u_int32_t st_page_in;		/* Pages read in. */
	u_int32_t st_page_out;		/* Pages written out. */
	u_int32_t st_ro_evict;		/* Clean pages forced from the cache. */
	u_int32_t st_rw_evict;		/* Dirty pages forced from the cache. */
	u_int32_t st_page_trickle;	/* Pages written by memp_trickle. */
	u_int32_t st_pages;		/* Total number of pages. */
	u_int32_t st_page_clean;	/* Clean pages. */
	u_int32_t st_page_dirty;	/* Dirty pages. */
	u_int32_t st_hash_buckets;	/* Number of hash buckets. */
	u_int32_t st_hash_searches;	/* Total hash chain searches. */
	u_int32_t st_hash_longest;	/* Longest hash chain searched. */
	u_int32_t st_hash_examined;	/* Total hash entries searched. */
	u_int32_t st_hash_nowait;	/* Hash lock granted with nowait. */
	u_int32_t st_hash_wait;		/* Hash lock granted after wait. */
	u_int32_t st_hash_max_wait;	/* Max hash lock granted after wait. */
	u_int32_t st_region_nowait;	/* Region lock granted with nowait. */
	u_int32_t st_region_wait;	/* Region lock granted after wait. */
	u_int32_t st_alloc;		/* Number of page allocations. */
	u_int32_t st_alloc_buckets;	/* Buckets checked during allocation. */
	u_int32_t st_alloc_max_buckets;	/* Max checked during allocation. */
	u_int32_t st_alloc_pages;	/* Pages checked during allocation. */