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g_gate.h
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Editing: g_gate.h
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004-2009 Pawel Jakub Dawidek <pjd@FreeBSD.org> * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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. * * $FreeBSD$ */ #ifndef _G_GATE_H_ #define _G_GATE_H_ #include <sys/param.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/queue.h> #include <geom/geom.h> #define G_GATE_CLASS_NAME "GATE" #define G_GATE_PROVIDER_NAME "ggate" #define G_GATE_MOD_NAME "ggate" #define G_GATE_CTL_NAME "ggctl" #define G_GATE_VERSION 3 /* * Maximum number of request that can be stored in * the queue when there are no workers. */ #define G_GATE_MAX_QUEUE_SIZE 4096 #define G_GATE_FLAG_READONLY 0x0001 #define G_GATE_FLAG_WRITEONLY 0x0002 #define G_GATE_FLAG_DESTROY 0x1000 #define G_GATE_USERFLAGS (G_GATE_FLAG_READONLY | G_GATE_FLAG_WRITEONLY) /* * Pick unit number automatically in /dev/ggate<unit>. */ #define G_GATE_UNIT_AUTO (-1) /* * Full provider name is given, so don't use ggate<unit>. */ #define G_GATE_NAME_GIVEN (-2) #define G_GATE_CMD_CREATE _IOWR('m', 0, struct g_gate_ctl_create) #define G_GATE_CMD_MODIFY _IOWR('m', 1, struct g_gate_ctl_modify) #define G_GATE_CMD_DESTROY _IOWR('m', 2, struct g_gate_ctl_destroy) #define G_GATE_CMD_CANCEL _IOWR('m', 3, struct g_gate_ctl_cancel) #define G_GATE_CMD_START _IOWR('m', 4, struct g_gate_ctl_io) #define G_GATE_CMD_DONE _IOWR('m', 5, struct g_gate_ctl_io) #define G_GATE_INFOSIZE 2048 #ifdef _KERNEL /* * 'P:' means 'Protected by'. */ struct g_gate_softc { char *sc_name; /* P: (read-only) */ int sc_unit; /* P: (read-only) */ int sc_ref; /* P: g_gate_list_mtx */ struct g_provider *sc_provider; /* P: (read-only) */ uint32_t sc_flags; /* P: sc_queue_mtx */ struct bio_queue_head sc_inqueue; /* P: sc_queue_mtx */ struct bio_queue_head sc_outqueue; /* P: sc_queue_mtx */ struct mtx sc_queue_mtx; uint32_t sc_queue_count; /* P: sc_queue_mtx */ uint32_t sc_queue_size; /* P: (read-only) */ u_int sc_timeout; /* P: (read-only) */ struct g_consumer *sc_readcons; /* P: sc_read_mtx */ off_t sc_readoffset; /* P: sc_read_mtx */ struct callout sc_callout; /* P: (modified only from callout thread) */ uintptr_t sc_seq; /* P: sc_queue_mtx */ LIST_ENTRY(g_gate_softc) sc_next; /* P: g_gate_list_mtx */ char sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */ struct mtx sc_read_mtx; }; #define G_GATE_DEBUG(lvl, ...) \ _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), NULL, __VA_ARGS__) #define G_GATE_LOGREQ(lvl, bp, ...) \ _GEOM_DEBUG("GEOM_GATE", g_gate_debug, (lvl), (bp), __VA_ARGS__) #endif /* !_KERNEL */ struct g_gate_ctl_create { u_int gctl_version; off_t gctl_mediasize; u_int gctl_sectorsize; u_int gctl_flags; u_int gctl_maxcount; u_int gctl_timeout; char gctl_name[NAME_MAX]; char gctl_info[G_GATE_INFOSIZE]; char gctl_readprov[NAME_MAX]; off_t gctl_readoffset; int gctl_unit; /* in/out */ }; #define GG_MODIFY_MEDIASIZE 0x01 #define GG_MODIFY_INFO 0x02 #define GG_MODIFY_READPROV 0x04 #define GG_MODIFY_READOFFSET 0x08 struct g_gate_ctl_modify { u_int gctl_version; int gctl_unit; uint32_t gctl_modify; off_t gctl_mediasize; char gctl_info[G_GATE_INFOSIZE]; char gctl_readprov[NAME_MAX]; off_t gctl_readoffset; }; struct g_gate_ctl_destroy { u_int gctl_version; int gctl_unit; int gctl_force; char gctl_name[NAME_MAX]; }; struct g_gate_ctl_cancel { u_int gctl_version; int gctl_unit; uintptr_t gctl_seq; char gctl_name[NAME_MAX]; }; struct g_gate_ctl_io { u_int gctl_version; int gctl_unit; uintptr_t gctl_seq; u_int gctl_cmd; off_t gctl_offset; off_t gctl_length; void *gctl_data; int gctl_error; }; #endif /* !_G_GATE_H_ */
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