150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/*-
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* Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _G_GATE_H_
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#define _G_GATE_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <geom/geom.h>
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#define G_GATE_CLASS_NAME "GATE"
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#define G_GATE_PROVIDER_NAME "ggate"
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#define G_GATE_MOD_NAME "ggate"
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#define G_GATE_CTL_NAME "ggctl"
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#define G_GATE_VERSION 1
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/*
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* Maximum number of request that can be stored in
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* the queue when there are no workers.
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*/
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#define G_GATE_MAX_QUEUE_SIZE 4096
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#define G_GATE_FLAG_READONLY 0x0001
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#define G_GATE_FLAG_WRITEONLY 0x0002
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#define G_GATE_FLAG_DESTROY 0x1000
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#define G_GATE_USERFLAGS (G_GATE_FLAG_READONLY | G_GATE_FLAG_WRITEONLY)
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#define G_GATE_CMD_CREATE _IOWR('m', 0, struct g_gate_ctl_create)
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#define G_GATE_CMD_DESTROY _IOWR('m', 1, struct g_gate_ctl_destroy)
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#define G_GATE_CMD_CANCEL _IOWR('m', 2, struct g_gate_ctl_cancel)
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#define G_GATE_CMD_START _IOWR('m', 3, struct g_gate_ctl_io)
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#define G_GATE_CMD_DONE _IOWR('m', 4, struct g_gate_ctl_io)
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#define G_GATE_INFOSIZE 2048
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#ifdef _KERNEL
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/*
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* 'P:' means 'Protected by'.
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*/
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struct g_gate_softc {
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int sc_unit; /* P: (read-only) */
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int16_t sc_ref; /* P: g_gate_list_mtx */
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struct g_provider *sc_provider; /* P: (read-only) */
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uint32_t sc_flags; /* P: (read-only) */
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struct bio_queue_head sc_inqueue; /* P: sc_queue_mtx */
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struct bio_queue_head sc_outqueue; /* P: sc_queue_mtx */
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struct mtx sc_queue_mtx;
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uint32_t sc_queue_count; /* P: sc_queue_mtx */
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uint32_t sc_queue_size; /* P: (read-only) */
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u_int sc_timeout; /* P: (read-only) */
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struct callout sc_callout; /* P: (modified only
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from callout
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thread) */
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uintptr_t sc_seq; /* P: (modified only
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from g_down
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thread) */
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LIST_ENTRY(g_gate_softc) sc_next; /* P: g_gate_list_mtx */
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char sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */
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};
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#define sc_name sc_provider->geom->name
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#define G_GATE_DEBUG(lvl, ...) do { \
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if (g_gate_debug >= (lvl)) { \
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printf("GEOM_GATE"); \
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if (g_gate_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_GATE_LOGREQ(lvl, bp, ...) do { \
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if (g_gate_debug >= (lvl)) { \
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printf("GEOM_GATE"); \
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if (g_gate_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf(" "); \
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g_print_bio(bp); \
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printf("\n"); \
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} \
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} while (0)
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#endif /* !_KERNEL */
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struct g_gate_ctl_create {
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u_int gctl_version;
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off_t gctl_mediasize;
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u_int gctl_sectorsize;
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u_int gctl_flags;
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u_int gctl_maxcount;
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u_int gctl_timeout;
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char gctl_info[G_GATE_INFOSIZE];
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int gctl_unit; /* out */
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};
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struct g_gate_ctl_destroy {
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u_int gctl_version;
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int gctl_unit;
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int gctl_force;
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};
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struct g_gate_ctl_cancel {
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u_int gctl_version;
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int gctl_unit;
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uintptr_t gctl_seq;
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};
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struct g_gate_ctl_io {
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u_int gctl_version;
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int gctl_unit;
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uintptr_t gctl_seq;
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u_int gctl_cmd;
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off_t gctl_offset;
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off_t gctl_length;
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void *gctl_data;
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int gctl_error;
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};
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#endif /* !_G_GATE_H_ */
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