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Length: 1946 (0x79a)
Types: TextFile
Notes: UNIX file
Names: »iobuf.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/iobuf.h«
/* Copyright (c) 1984 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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */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 "@(#)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 */