diff options
Diffstat (limited to 'sys/geom/gate/g_gate.h')
| -rw-r--r-- | sys/geom/gate/g_gate.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sys/geom/gate/g_gate.h b/sys/geom/gate/g_gate.h new file mode 100644 index 0000000..c89b2c5 --- /dev/null +++ b/sys/geom/gate/g_gate.h @@ -0,0 +1,143 @@ +/*- + * Copyright (c) 2004 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 0 + +/* + * 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) + +#define G_GATE_CMD_CREATE _IOWR('m', 0, struct g_gate_ctl_create) +#define G_GATE_CMD_DESTROY _IOWR('m', 1, struct g_gate_ctl_destroy) +#define G_GATE_CMD_START _IOWR('m', 2, struct g_gate_ctl_io) +#define G_GATE_CMD_DONE _IOWR('m', 3, struct g_gate_ctl_io) + +#define G_GATE_INFOSIZE 2048 + +#ifdef _KERNEL +/* + * 'P:' means 'Protected by'. + */ +struct g_gate_softc { + int sc_unit; /* P: (read-only) */ + uint16_t sc_ref; /* P: g_gate_list_mtx */ + struct g_provider *sc_provider; /* P: (read-only) */ + uint16_t sc_flags; /* P: (read-only) */ + + struct bio_queue_head sc_inqueue; /* P: sc_inqueue_mtx */ + struct mtx sc_inqueue_mtx; + struct bio_queue_head sc_outqueue; /* P: sc_outqueue_mtx */ + struct mtx sc_outqueue_mtx; + uint16_t sc_queue_count; /* P: (atomic) */ + uint16_t sc_queue_size; /* P: (read-only) */ + u_int sc_timeout; /* P: (read-only) */ + struct callout sc_callout; /* P: (modified only + from callout + thread) */ + u_int sc_seq; /* P: (modified only + from g_down + thread) */ + LIST_ENTRY(g_gate_softc) sc_next; /* P: g_gate_list_mtx */ + char sc_info[G_GATE_INFOSIZE]; /* P: (read-only) */ +}; +#define sc_name sc_provider->geom->name + +#define G_GATE_DEBUG(lvl, ...) do { \ + if (g_gate_debug >= (lvl)) { \ + printf("GEOM_GATE"); \ + if (g_gate_debug > 0) \ + printf("[%u]", lvl); \ + printf(": "); \ + printf(__VA_ARGS__); \ + printf("\n"); \ + } \ +} while (0) +#define G_GATE_LOGREQ(lvl, bp, ...) do { \ + if (g_gate_debug >= (lvl)) { \ + printf("GEOM_GATE"); \ + if (g_gate_debug > 0) \ + printf("[%u]", lvl); \ + printf(": "); \ + printf(__VA_ARGS__); \ + printf(" "); \ + g_print_bio(bp); \ + printf("\n"); \ + } \ +} while (0) +#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_info[G_GATE_INFOSIZE]; + int gctl_unit; /* out */ +}; + +struct g_gate_ctl_destroy { + u_int gctl_version; + int gctl_unit; + int gctl_force; +}; + +struct g_gate_ctl_io { + u_int gctl_version; + int gctl_unit; + u_int gctl_seq; + u_int gctl_cmd; + off_t gctl_offset; + off_t gctl_length; + void *gctl_data; + int gctl_error; +}; +#endif /* !_G_GATE_H_ */ |
