2 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
3 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
4 * Made nbd_end_request() use the io_request_lock
5 * 2001 Copyright (C) Steven Whitehouse
6 * New nbd_end_request() for compatibility with new linux block
8 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
9 * Removed unneeded blksize_bits field from nbd_device struct.
10 * Cleanup PARANOIA usage & code.
11 * 2004/02/19 Paul Clements
12 * Removed PARANOIA, plus various cleanup and comments
18 #include <linux/types.h>
20 #define NBD_SET_SOCK _IO( 0xab, 0 )
21 #define NBD_SET_BLKSIZE _IO( 0xab, 1 )
22 #define NBD_SET_SIZE _IO( 0xab, 2 )
23 #define NBD_DO_IT _IO( 0xab, 3 )
24 #define NBD_CLEAR_SOCK _IO( 0xab, 4 )
25 #define NBD_CLEAR_QUE _IO( 0xab, 5 )
26 #define NBD_PRINT_DEBUG _IO( 0xab, 6 )
27 #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 )
28 #define NBD_DISCONNECT _IO( 0xab, 8 )
29 #define NBD_SET_TIMEOUT _IO( 0xab, 9 )
30 #define NBD_SET_FLAGS _IO( 0xab, 10 )
39 #define NBD_CMD_MASK_COMMAND 0x0000ffff
40 #define NBD_CMD_FLAG_FUA (1<<16)
42 /* values for flags field */
43 #define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */
44 #define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */
45 #define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */
46 #define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */
47 #define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */
49 #define nbd_cmd(req) ((req)->cmd[0])
51 /* userspace doesn't need the nbd_device structure */
54 #include <linux/wait.h>
55 #include <linux/mutex.h>
61 int harderror; /* Code of hard error */
63 struct file * file; /* If == NULL, device is not ready, yet */
66 spinlock_t queue_lock;
67 struct list_head queue_head; /* Requests waiting result */
68 struct request *active_req;
69 wait_queue_head_t active_wq;
70 struct list_head waiting_queue; /* Requests to be sent */
71 wait_queue_head_t waiting_wq;
77 pid_t pid; /* pid of nbd-client, if attached */
83 /* These are sent over the network in the request/reply magic fields */
85 #define NBD_REQUEST_MAGIC 0x25609513
86 #define NBD_REPLY_MAGIC 0x67446698
87 /* Do *not* use magics: 0x12560953 0x96744668. */
90 * This is the packet used for communication between client and
91 * server. All data are in network byte order.
95 __be32 type; /* == READ || == WRITE */
99 } __attribute__((packed));
102 * This is the reply packet that nbd-server sends back to the client after
103 * it has completed an I/O request (or an error occurs).
107 __be32 error; /* 0 = ok, else error */
108 char handle[8]; /* handle you got from request */