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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ifndef _SYS_FS_FIFONODE_H
#define _SYS_FS_FIFONODE_H
#if defined(_KERNEL)
#include <sys/vfs_opreg.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* Each FIFOFS object is identified by a struct fifonode/vnode pair.
* This is also the hierarchy
* flk_lock protects:
* fn_mp
* fn_tail
* fn_count
* fn_flag
* fn_wcnt
* fn_rcnt
* fn_open
* fn_rsynccnt
* fn_wsynccnt
* fn_wwaitcnt
* fn_atime
* fn_mtime
* fn_ctime
* fn_insync
* flk_ref
* flk_ocsync
* ftable lock protects - actually this is independent
* fifoalloc[]
* fn_nextp
* fn_backp
*/
typedef struct fifolock {
kmutex_t flk_lock; /* fifo lock */
int flk_ref; /* number of fifonodes using this */
short flk_ocsync; /* sync open/close */
kcondvar_t flk_wait_cv; /* conditional for flk_ocsync */
uint_t flk_fill[4]; /* cache align lock structure */
} fifolock_t;
typedef struct fifonode fifonode_t;
struct fifonode {
struct vnode *fn_vnode; /* represents the fifo/pipe */
struct vnode *fn_realvp; /* node being shadowed by fifo */
ino_t fn_ino; /* node id for pipes */
fifonode_t *fn_dest; /* the other end of a pipe */
struct msgb *fn_mp; /* message waiting to be read */
struct msgb *fn_tail; /* last message to read */
fifolock_t *fn_lock; /* pointer to per fifo lock */
uint_t fn_count; /* Number of bytes on fn_mp */
kcondvar_t fn_wait_cv; /* fifo conditional variable */
ushort_t fn_wcnt; /* number of writers */
ushort_t fn_rcnt; /* number of readers */
ushort_t fn_open; /* open count of node */
ushort_t fn_wsynccnt; /* fifos waiting for open write sync */
ushort_t fn_rsynccnt; /* fifos waiting for open read sync */
ushort_t fn_wwaitcnt; /* threads waiting to write data */
time_t fn_atime; /* access times */
time_t fn_mtime; /* modification time */
time_t fn_ctime; /* change time */
fifonode_t *fn_nextp; /* next link in the linked list */
fifonode_t *fn_backp; /* back link in linked list */
struct cred *fn_pcredp; /* credential associated with peer */
pid_t fn_cpid; /* original peer pid */
int fn_insync;
uint_t fn_flag; /* flags as defined below */
};
typedef struct fifodata {
fifolock_t fifo_lock;
fifonode_t fifo_fnode[2];
} fifodata_t;
/*
* Valid flags for fifonodes.
*/
#define ISPIPE 0x0001 /* fifonode is that of a pipe */
#define FIFOSEND 0x0002 /* file descriptor at stream head of pipe */
#define FIFOOPEN 0x0004 /* fifo is opening */
#define FIFOCLOSE 0x0008 /* fifo is closing */
#define FIFOCONNLD 0x0010 /* connld pushed on pipe */
#define FIFOFAST 0x0020 /* FIFO in fast mode */
#define FIFOWANTR 0x0040 /* reader waiting for data */
#define FIFOWANTW 0x0080 /* writer waiting to write */
#define FIFOSETSIG 0x0100 /* I_SETSIG ioctl was issued */
#define FIFOHIWATW 0x0200 /* We have gone over hi water mark */
#define FIFORWBUSY 0x0400 /* Fifo is busy in read or write */
#define FIFOPOLLW 0x0800 /* process waiting on poll write */
#define FIFOPOLLR 0x1000 /* process waiting on poll read */
#define FIFOISOPEN 0x2000 /* pipe is open */
#define FIFOSYNC 0x4000 /* FIFO is waiting for open sync */
#define FIFOWOCR 0x8000 /* Write open occurred */
#define FIFOROCR 0x10000 /* Read open occurred */
/*
* process waiting on poll read on band data
* this can only occur if we go to streams
* mode
*/
#define FIFOPOLLRBAND 0x20000
#define FIFOSTAYFAST 0x40000 /* don't turn into stream mode */
#define FIFOWAITMODE 0x80000 /* waiting for the possibility to change mode */
#define FIFOHIWAT (16 * 1024)
#define FIFOLOWAT (0)
/*
* Macros to convert a vnode to a fifnode, and vice versa.
*/
#define VTOF(vp) ((struct fifonode *)((vp)->v_data))
#define FTOV(fp) ((fp)->fn_vnode)
#if defined(_KERNEL)
/*
* Fifohiwat defined as a variable is to allow tuning of the high
* water mark if needed. It is not meant to be released.
*/
#if FIFODEBUG
extern int Fifohiwat;
#else /* FIFODEBUG */
#define Fifohiwat FIFOHIWAT
#endif /* FIFODEBUG */
extern struct vnodeops *fifo_vnodeops;
extern const struct fs_operation_def fifo_vnodeops_template[];
extern struct kmem_cache *fnode_cache;
extern struct kmem_cache *pipe_cache;
struct vfssw;
struct queue;
extern int fifoinit(int, char *);
extern int fifo_stropen(vnode_t **, int, cred_t *, int, int);
extern int fifo_open(vnode_t **, int, cred_t *, caller_context_t *);
extern int fifo_close(vnode_t *, int, int, offset_t, cred_t *,
caller_context_t *);
extern void fifo_cleanup(vnode_t *, int);
extern void fiforemove(fifonode_t *);
extern ino_t fifogetid(void);
extern vnode_t *fifovp(vnode_t *, cred_t *);
extern void makepipe(vnode_t **, vnode_t **);
extern void fifo_fastflush(fifonode_t *);
extern void fifo_vfastoff(vnode_t *);
extern void fifo_fastoff(fifonode_t *);
extern struct streamtab *fifo_getinfo();
extern void fifo_wakereader(fifonode_t *, fifolock_t *);
extern void fifo_wakewriter(fifonode_t *, fifolock_t *);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_FIFONODE_H */
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