[dump.git] / common / slave.h


/*
 * Structures pulled from dump/tape.c. We need it here so the 'archive' code can
 * determine where we are in the tape.
 */
#ifndef _SLAVE_H
#define _SLAVE_H 1

/*
 * Concurrent dump mods (Caltech) - disk block reading and tape writing
 * are exported to several slave processes.  While one slave writes the
 * tape, the others read disk blocks; they pass control of the tape in
 * a ring via signals. The parent process traverses the filesystem and
 * sends writeheader()'s and lists of daddr's to the slaves via pipes.
 * The following structure defines the instruction packets sent to slaves.
 */
struct req {
	ext2_loff_t dblk;
	int count;
};

#define SLAVES 3		/* 1 slave writing, 1 reading, 1 for slack */

struct slave {
	int tapea;		/* header number at start of this chunk */
	int count;		/* count to next header (used for TS_TAPE */
				/* after EOT) */
	int inode;		/* inode that we are currently dealing with */
	int fd;			/* FD for this slave */
	int pid;		/* PID for this slave */
	int sent;		/* 1 == we've sent this slave requests */
	int firstrec;		/* record number of this block */
	char (*tblock)[TP_BSIZE]; /* buffer for data blocks */
	struct req *req;	/* buffer for requests */
};

extern struct slave *slp;

#endif
Commit	Line	Data
70deb804 SP	1
	2	/*
	3	* Structures pulled from dump/tape.c. We need it here so the 'archive' code can
	4	* determine where we are in the tape.
	5	*/
	6	#ifndef _SLAVE_H
	7	#define _SLAVE_H 1
	8
	9	/*
	10	* Concurrent dump mods (Caltech) - disk block reading and tape writing
	11	* are exported to several slave processes. While one slave writes the
	12	* tape, the others read disk blocks; they pass control of the tape in
	13	* a ring via signals. The parent process traverses the filesystem and
	14	* sends writeheader()'s and lists of daddr's to the slaves via pipes.
	15	* The following structure defines the instruction packets sent to slaves.
	16	*/
	17	struct req {
	18	ext2_loff_t dblk;
	19	int count;
	20	};
	21
	22	#define SLAVES 3 /* 1 slave writing, 1 reading, 1 for slack */
	23
	24	struct slave {
	25	int tapea; /* header number at start of this chunk */
	26	int count; /* count to next header (used for TS_TAPE */
	27	/* after EOT) */
	28	int inode; /* inode that we are currently dealing with */
	29	int fd; /* FD for this slave */
	30	int pid; /* PID for this slave */
	31	int sent; /* 1 == we've sent this slave requests */
	32	int firstrec; /* record number of this block */
	33	char (tblock)[TP_BSIZE]; / buffer for data blocks */
	34	struct req req; / buffer for requests */
	35	};
	36
	37	extern struct slave *slp;
	38
	39	#endif