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Diffstat (limited to 'sys/sys/specdev.h')
-rw-r--r-- | sys/sys/specdev.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sys/sys/specdev.h b/sys/sys/specdev.h new file mode 100644 index 0000000..2570b20 --- /dev/null +++ b/sys/sys/specdev.h @@ -0,0 +1,113 @@ +/* $OpenBSD: specdev.h,v 1.39 2019/12/27 22:17:01 bluhm Exp $ */ +/* $NetBSD: specdev.h,v 1.12 1996/02/13 13:13:01 mycroft Exp $ */ + +/* + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)specdev.h 8.3 (Berkeley) 8/10/94 + */ + +SLIST_HEAD(vnodechain, vnode); + +/* + * This structure defines the information maintained about + * special devices. It is allocated in checkalias and freed + * in vgone. + */ +struct specinfo { + struct vnodechain *si_hashchain; + SLIST_ENTRY(vnode) si_specnext; + struct mount *si_mountpoint; + dev_t si_rdev; + struct lockf_state *si_lockf; + daddr_t si_lastr; + union { + struct vnode *ci_parent; /* pointer back to parent device */ + u_int8_t *ci_bitmap; /* bitmap of devices cloned off us */ + } si_ci; +}; + +struct cloneinfo { + struct vnode *ci_vp; /* cloned vnode */ + void *ci_data; /* original vnode's v_data */ +}; + +/* + * Exported shorthand + */ +#define v_rdev v_specinfo->si_rdev +#define v_hashchain v_specinfo->si_hashchain +#define v_specnext v_specinfo->si_specnext +#define v_specmountpoint v_specinfo->si_mountpoint +#define v_speclockf v_specinfo->si_lockf +#define v_specparent v_specinfo->si_ci.ci_parent +#define v_specbitmap v_specinfo->si_ci.ci_bitmap + +/* + * We use the upper 16 bits of the minor to record the clone instance. + * This gives us 8 bits for encoding the real minor number. + */ +#define CLONE_SHIFT 8 +#define CLONE_MAPSZ 128 + +/* + * Special device management + */ +#define SPECHSZ 64 +#if ((SPECHSZ&(SPECHSZ-1)) == 0) +#define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1)) +#else +#define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ) +#endif + +#ifdef _KERNEL + +extern struct vnodechain speclisth[SPECHSZ]; + +/* + * Prototypes for special file operations on vnodes. + */ +int spec_badop(void *); +int spec_getattr(void *); +int spec_setattr(void *); +int spec_access(void *); +int spec_open(void *); +int spec_close(void *); +int spec_read(void *); +int spec_write(void *); +int spec_ioctl(void *); +int spec_poll(void *); +int spec_kqfilter(void *); +int spec_fsync(void *); +int spec_inactive(void *); +int spec_strategy(void *); +int spec_print(void *); +int spec_pathconf(void *); +int spec_advlock(void *); + +#endif /* _KERNEL */ |