usr.sbin/bhyve/block_if.h

   1 /*-
   2  * Copyright (c) 2013  Peter Grehan <grehan@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 /*
  30  * The block API to be used by bhyve block-device emulations. The routines
  31  * are thread safe, with no assumptions about the context of the completion
  32  * callback - it may occur in the caller's context, or asynchronously in
  33  * another thread.
  34  */
  35
  36 #ifndef _BLOCK_IF_H_
  37 #define _BLOCK_IF_H_
  38
  39 #include <sys/uio.h>
  40 #include <sys/unistd.h>
  41
  42 #define BLOCKIF_IOV_MAX         33      /* not practical to be IOV_MAX */
  43
  44 struct blockif_req {
  45         struct iovec    br_iov[BLOCKIF_IOV_MAX];
  46         int             br_iovcnt;
  47         off_t           br_offset;
  48         ssize_t         br_resid;
  49         void            (*br_callback)(struct blockif_req *req, int err);
  50         void            *br_param;
  51 };
  52
  53 struct blockif_ctxt;
  54 struct blockif_ctxt *blockif_open(const char *optstr, const char *ident);
  55 off_t   blockif_size(struct blockif_ctxt *bc);
  56 void    blockif_chs(struct blockif_ctxt *bc, uint16_t *c, uint8_t *h,
  57     uint8_t *s);
  58 int     blockif_sectsz(struct blockif_ctxt *bc);
  59 void    blockif_psectsz(struct blockif_ctxt *bc, int *size, int *off);
  60 int     blockif_queuesz(struct blockif_ctxt *bc);
  61 int     blockif_is_ro(struct blockif_ctxt *bc);
  62 int     blockif_candelete(struct blockif_ctxt *bc);
  63 int     blockif_read(struct blockif_ctxt *bc, struct blockif_req *breq);
  64 int     blockif_write(struct blockif_ctxt *bc, struct blockif_req *breq);
  65 int     blockif_flush(struct blockif_ctxt *bc, struct blockif_req *breq);
  66 int     blockif_delete(struct blockif_ctxt *bc, struct blockif_req *breq);
  67 int     blockif_cancel(struct blockif_ctxt *bc, struct blockif_req *breq);
  68 int     blockif_close(struct blockif_ctxt *bc);
  69
  70 #endif /* _BLOCK_IF_H_ */