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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [nbd.h] - Blame information for rev 81

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
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 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
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 *            Made nbd_end_request() use the io_request_lock
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 * 2001 Copyright (C) Steven Whitehouse
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 *            New nbd_end_request() for compatibility with new linux block
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 *            layer code.
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 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
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 *            Removed unneeded blksize_bits field from nbd_device struct.
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 *            Cleanup PARANOIA usage & code.
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 * 2004/02/19 Paul Clements
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 *            Removed PARANOIA, plus various cleanup and comments
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 */
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#ifndef LINUX_NBD_H
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#define LINUX_NBD_H
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#include <linux/types.h>
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#define NBD_SET_SOCK    _IO( 0xab, 0 )
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#define NBD_SET_BLKSIZE _IO( 0xab, 1 )
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#define NBD_SET_SIZE    _IO( 0xab, 2 )
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#define NBD_DO_IT       _IO( 0xab, 3 )
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#define NBD_CLEAR_SOCK  _IO( 0xab, 4 )
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#define NBD_CLEAR_QUE   _IO( 0xab, 5 )
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#define NBD_PRINT_DEBUG _IO( 0xab, 6 )
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#define NBD_SET_SIZE_BLOCKS     _IO( 0xab, 7 )
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#define NBD_DISCONNECT  _IO( 0xab, 8 )
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#define NBD_SET_TIMEOUT _IO( 0xab, 9 )
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enum {
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        NBD_CMD_READ = 0,
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        NBD_CMD_WRITE = 1,
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        NBD_CMD_DISC = 2
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};
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#define nbd_cmd(req) ((req)->cmd[0])
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#define MAX_NBD 128
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/* userspace doesn't need the nbd_device structure */
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#ifdef __KERNEL__
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#include <linux/wait.h>
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#include <linux/mutex.h>
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/* values for flags field */
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#define NBD_READ_ONLY 0x0001
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#define NBD_WRITE_NOCHK 0x0002
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struct request;
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struct nbd_device {
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        int flags;
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        int harderror;          /* Code of hard error                   */
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        struct socket * sock;
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        struct file * file;     /* If == NULL, device is not ready, yet */
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        int magic;
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        spinlock_t queue_lock;
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        struct list_head queue_head;/* Requests are added here...       */
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        struct request *active_req;
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        wait_queue_head_t active_wq;
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        struct mutex tx_lock;
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        struct gendisk *disk;
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        int blksize;
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        u64 bytesize;
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        pid_t pid; /* pid of nbd-client, if attached */
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        int xmit_timeout;
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};
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#endif
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/* These are sent over the network in the request/reply magic fields */
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#define NBD_REQUEST_MAGIC 0x25609513
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#define NBD_REPLY_MAGIC 0x67446698
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/* Do *not* use magics: 0x12560953 0x96744668. */
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/*
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 * This is the packet used for communication between client and
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 * server. All data are in network byte order.
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 */
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struct nbd_request {
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        __be32 magic;
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        __be32 type;    /* == READ || == WRITE  */
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        char handle[8];
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        __be64 from;
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        __be32 len;
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}
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#ifdef __GNUC__
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        __attribute__ ((packed))
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#endif
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;
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/*
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 * This is the reply packet that nbd-server sends back to the client after
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 * it has completed an I/O request (or an error occurs).
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 */
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struct nbd_reply {
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        __be32 magic;
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        __be32 error;           /* 0 = ok, else error   */
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        char handle[8];         /* handle you got from request  */
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};
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#endif

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