91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
#ifndef __NBDTYPES_H
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#define __NBDTYPES_H
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/* http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-09/2332.html */
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#define INIT_PASSWD "NBDMAGIC"
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#define INIT_MAGIC 0x0000420281861253
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#define REQUEST_MAGIC 0x25609513
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#define REPLY_MAGIC 0x67446698
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#define REQUEST_READ 0
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#define REQUEST_WRITE 1
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#define REQUEST_DISCONNECT 2
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/* The top 2 bytes of the type field are overloaded and can contain flags */
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#define REQUEST_MASK 0x0000ffff
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/* 1MiB is the de-facto standard for maximum size of header + data */
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#define NBD_MAX_SIZE ( 16 * 1024 * 1024 )
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#define NBD_REQUEST_SIZE ( sizeof( struct nbd_request_raw ) )
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#define NBD_REPLY_SIZE ( sizeof( struct nbd_reply_raw ) )
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#include <linux/types.h>
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#include <inttypes.h>
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typedef union nbd_handle_t {
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uint8_t b[8];
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uint64_t w;
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} nbd_handle_t;
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/* The _raw types are the types as they appear on the wire. Non-_raw
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* types are in host-format.
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* Conversion functions are _r2h_ for converting raw to host, and _h2r_
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* for converting host to raw.
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*/
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struct nbd_init_raw {
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char passwd[8];
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__be64 magic;
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__be64 size;
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char reserved[128];
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};
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struct nbd_request_raw {
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__be32 magic;
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__be32 type; /* == READ || == WRITE */
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nbd_handle_t handle;
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__be64 from;
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__be32 len;
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} __attribute__((packed));
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struct nbd_reply_raw {
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__be32 magic;
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__be32 error; /* 0 = ok, else error */
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nbd_handle_t handle; /* handle you got from request */
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};
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struct nbd_init {
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char passwd[8];
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uint64_t magic;
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uint64_t size;
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char reserved[128];
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};
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struct nbd_request {
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uint32_t magic;
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uint32_t type; /* == READ || == WRITE || == DISCONNECT */
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nbd_handle_t handle;
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uint64_t from;
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uint32_t len;
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} __attribute__((packed));
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struct nbd_reply {
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uint32_t magic;
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uint32_t error; /* 0 = ok, else error */
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nbd_handle_t handle; /* handle you got from request */
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};
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void nbd_r2h_init( struct nbd_init_raw * from, struct nbd_init * to );
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void nbd_r2h_request( struct nbd_request_raw *from, struct nbd_request * to );
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void nbd_r2h_reply( struct nbd_reply_raw * from, struct nbd_reply * to );
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void nbd_h2r_init( struct nbd_init * from, struct nbd_init_raw * to);
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void nbd_h2r_request( struct nbd_request * from, struct nbd_request_raw * to );
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void nbd_h2r_reply( struct nbd_reply * from, struct nbd_reply_raw * to );
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#endif
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