1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Peter Grehan <grehan@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 /* 32 * The block API to be used by bhyve block-device emulations. The routines 33 * are thread safe, with no assumptions about the context of the completion 34 * callback - it may occur in the caller's context, or asynchronously in 35 * another thread. 36 */ 37 38 #ifndef _BLOCK_IF_H_ 39 #define _BLOCK_IF_H_ 40 41 #include <sys/nv.h> 42 #include <sys/uio.h> 43 #include <sys/unistd.h> 44 45 struct vm_snapshot_meta; 46 47 48 /* 49 * BLOCKIF_IOV_MAX is the maximum number of scatter/gather entries in 50 * a single request. BLOCKIF_RING_MAX is the maxmimum number of 51 * pending requests that can be queued. 52 */ 53 #define BLOCKIF_IOV_MAX 128 /* not practical to be IOV_MAX */ 54 #define BLOCKIF_RING_MAX 128 55 56 struct blockif_req { 57 int br_iovcnt; 58 off_t br_offset; 59 ssize_t br_resid; 60 void (*br_callback)(struct blockif_req *req, int err); 61 void *br_param; 62 struct iovec br_iov[BLOCKIF_IOV_MAX]; 63 }; 64 65 struct blockif_ctxt; 66 67 typedef void blockif_resize_cb(struct blockif_ctxt *, void *, size_t); 68 69 int blockif_legacy_config(nvlist_t *nvl, const char *opts); 70 struct blockif_ctxt *blockif_open(nvlist_t *nvl, const char *ident); 71 int blockif_register_resize_callback(struct blockif_ctxt *bc, 72 blockif_resize_cb *cb, void *cb_arg); 73 off_t blockif_size(struct blockif_ctxt *bc); 74 void blockif_chs(struct blockif_ctxt *bc, uint16_t *c, uint8_t *h, 75 uint8_t *s); 76 int blockif_sectsz(struct blockif_ctxt *bc); 77 void blockif_psectsz(struct blockif_ctxt *bc, int *size, int *off); 78 int blockif_queuesz(struct blockif_ctxt *bc); 79 int blockif_is_ro(struct blockif_ctxt *bc); 80 int blockif_candelete(struct blockif_ctxt *bc); 81 int blockif_read(struct blockif_ctxt *bc, struct blockif_req *breq); 82 int blockif_write(struct blockif_ctxt *bc, struct blockif_req *breq); 83 int blockif_flush(struct blockif_ctxt *bc, struct blockif_req *breq); 84 int blockif_delete(struct blockif_ctxt *bc, struct blockif_req *breq); 85 int blockif_cancel(struct blockif_ctxt *bc, struct blockif_req *breq); 86 int blockif_close(struct blockif_ctxt *bc); 87 #ifdef BHYVE_SNAPSHOT 88 void blockif_pause(struct blockif_ctxt *bc); 89 void blockif_resume(struct blockif_ctxt *bc); 90 #endif 91 92 #endif /* _BLOCK_IF_H_ */ 93