projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 607ca46e DH |
1 | /* |
| 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 | |
| 7 | * layer code. | |
| 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 | |
| 13 | */ | |
| 14 | ||
| 15 | #ifndef _UAPILINUX_NBD_H | |
| 16 | #define _UAPILINUX_NBD_H | |
| 17 | ||
| 18 | #include <linux/types.h> | |
| 19 | ||
| 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) | |
| 31 | ||
| 32 | enum { | |
| 33 | NBD_CMD_READ = 0, | |
| 34 | NBD_CMD_WRITE = 1, | |
| 35 | NBD_CMD_DISC = 2, | |
| 75f187ab | 36 | NBD_CMD_FLUSH = 3, |
| 607ca46e DH |
37 | NBD_CMD_TRIM = 4 |
| 38 | }; | |
| 39 | ||
| a2c97909 | 40 | /* values for flags field, these are server interaction specific. */ |
| 9561a7ad JB |
41 | #define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */ |
| 42 | #define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */ | |
| 43 | #define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */ | |
| 607ca46e | 44 | /* there is a gap here to match userspace */ |
| 9561a7ad | 45 | #define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */ |
| 63db89ea | 46 | #define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */ |
| 607ca46e | 47 | |
| a2c97909 JB |
48 | /* These are client behavior specific flags. */ |
| 49 | #define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on | |
| 50 | disconnect. */ | |
| 51 | ||
| 607ca46e DH |
52 | /* userspace doesn't need the nbd_device structure */ |
| 53 | ||
| 54 | /* These are sent over the network in the request/reply magic fields */ | |
| 55 | ||
| 56 | #define NBD_REQUEST_MAGIC 0x25609513 | |
| 57 | #define NBD_REPLY_MAGIC 0x67446698 | |
| 58 | /* Do *not* use magics: 0x12560953 0x96744668. */ | |
| 59 | ||
| 60 | /* | |
| 61 | * This is the packet used for communication between client and | |
| 62 | * server. All data are in network byte order. | |
| 63 | */ | |
| 64 | struct nbd_request { | |
| 65 | __be32 magic; | |
| 66 | __be32 type; /* == READ || == WRITE */ | |
| 67 | char handle[8]; | |
| 68 | __be64 from; | |
| 69 | __be32 len; | |
| 70 | } __attribute__((packed)); | |
| 71 | ||
| 72 | /* | |
| 73 | * This is the reply packet that nbd-server sends back to the client after | |
| 74 | * it has completed an I/O request (or an error occurs). | |
| 75 | */ | |
| 76 | struct nbd_reply { | |
| 77 | __be32 magic; | |
| 78 | __be32 error; /* 0 = ok, else error */ | |
| 79 | char handle[8]; /* handle you got from request */ | |
| 80 | }; | |
| 81 | #endif /* _UAPILINUX_NBD_H */ |