Differential D26035 Diff 75760 usr.sbin/bhyve/block_if.h

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usr.sbin/bhyve/block_if.h

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	* are thread safe, with no assumptions about the context of the completion			* are thread safe, with no assumptions about the context of the completion
	* callback - it may occur in the caller's context, or asynchronously in			* callback - it may occur in the caller's context, or asynchronously in
	* another thread.			* another thread.
	*/			*/

	#ifndef _BLOCK_IF_H_			#ifndef _BLOCK_IF_H_
	#define _BLOCK_IF_H_			#define _BLOCK_IF_H_

				#include <sys/nv.h>
	#include <sys/uio.h>			#include <sys/uio.h>
	#include <sys/unistd.h>			#include <sys/unistd.h>

	struct vm_snapshot_meta;			struct vm_snapshot_meta;


	/*			/*
	* BLOCKIF_IOV_MAX is the maximum number of scatter/gather entries in			* BLOCKIF_IOV_MAX is the maximum number of scatter/gather entries in
	* a single request. BLOCKIF_RING_MAX is the maxmimum number of			* a single request. BLOCKIF_RING_MAX is the maxmimum number of
	* pending requests that can be queued.			* pending requests that can be queued.
	*/			*/
	#define BLOCKIF_IOV_MAX 128 /* not practical to be IOV_MAX */			#define BLOCKIF_IOV_MAX 128 /* not practical to be IOV_MAX */
	#define BLOCKIF_RING_MAX 128			#define BLOCKIF_RING_MAX 128

	struct blockif_req {			struct blockif_req {
	int br_iovcnt;			int br_iovcnt;
	off_t br_offset;			off_t br_offset;
	ssize_t br_resid;			ssize_t br_resid;
	void (br_callback)(struct blockif_req req, int err);			void (br_callback)(struct blockif_req req, int err);
	void *br_param;			void *br_param;
	struct iovec br_iov[BLOCKIF_IOV_MAX];			struct iovec br_iov[BLOCKIF_IOV_MAX];
	};			};

	struct blockif_ctxt;			struct blockif_ctxt;
	struct blockif_ctxt blockif_open(const char optstr, const char *ident);			int blockif_legacy_config(nvlist_t nvl, const char opts);
				struct blockif_ctxt blockif_open(nvlist_t nvl, const char *ident);
	off_t blockif_size(struct blockif_ctxt *bc);			off_t blockif_size(struct blockif_ctxt *bc);
	void blockif_chs(struct blockif_ctxt bc, uint16_t c, uint8_t *h,			void blockif_chs(struct blockif_ctxt bc, uint16_t c, uint8_t *h,
	uint8_t *s);			uint8_t *s);
	int blockif_sectsz(struct blockif_ctxt *bc);			int blockif_sectsz(struct blockif_ctxt *bc);
	void blockif_psectsz(struct blockif_ctxt bc, int size, int *off);			void blockif_psectsz(struct blockif_ctxt bc, int size, int *off);
	int blockif_queuesz(struct blockif_ctxt *bc);			int blockif_queuesz(struct blockif_ctxt *bc);
	int blockif_is_ro(struct blockif_ctxt *bc);			int blockif_is_ro(struct blockif_ctxt *bc);
	int blockif_candelete(struct blockif_ctxt *bc);			int blockif_candelete(struct blockif_ctxt *bc);
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