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- /* Copyright (c) 1984, 1986, 1987, 1988 AT&T */
- /* All Rights Reserved */
-
- /* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
- /* The copyright notice above does not evidence any */
- /* actual or intended publication of such source code. */
-
-
- #ident "@(#)head.sys:iobuf.h 1.3"
-
- /*
- * Each IDFC controller has an iobuf, which contains private state data
- * and 2 list heads: the b_forw/b_back list, which is doubly linked
- * and has all the buffers currently associated with that major
- * device; and the d_actf/d_actl list, which is private to the
- * controller but in fact is always used for the head and tail
- * of the I/O queue for the device.
- * Various routines in bio.c look at b_forw/b_back
- * (notice they are the same as in the buf structure)
- * but the rest is private to each device controller.
- */
- typedef struct iobuf
- {
- int b_flags; /* see buf.h */
- struct buf *b_forw; /* first buffer for this dev */
- struct buf *b_back; /* last buffer for this dev */
- struct buf *b_actf; /* head of I/O queue (b_forw)*/
- struct buf *b_actl; /* tail of I/O queue (b_back)*/
- dev_t b_dev; /* major+minor device name */
- char b_active; /* busy flag */
- char b_errcnt; /* error count (for recovery) */
- int jrqsleep; /* process sleep counter on jrq full */
- struct eblock *io_erec; /* error record */
- int io_nreg; /* number of registers to log on errors */
- paddr_t io_addr; /* local bus address */
- physadr io_mba; /* mba address */
- struct iostat *io_stp; /* unit I/O statistics */
- time_t io_start;
- int sgreq; /* SYSGEN required flag */
- int qcnt; /* outstanding job request counter */
- int io_s1; /* space for drivers to leave things */
- int io_s2; /* space for drivers to leave things */
- } iobuf_t;
-
- #define tabinit(dv,stat) {0,0,0,0,0,makedev(dv,0),0,00,0,0,0,0,0,stat,0,0,0,0,0}
- #define NDEVREG (sizeof(struct device)/sizeof(int))
-
- #define B_ONCE 01 /* flag for once only driver operations */
- #define B_TIME 04 /* for timeout use */
-