projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 LINUX_NBD_H | |
| 16 | #define LINUX_NBD_H | |
| 17 | ||
| 18 | #define NBD_SET_SOCK _IO( 0xab, 0 ) | |
| 19 | #define NBD_SET_BLKSIZE _IO( 0xab, 1 ) | |
| 20 | #define NBD_SET_SIZE _IO( 0xab, 2 ) | |
| 21 | #define NBD_DO_IT _IO( 0xab, 3 ) | |
| 22 | #define NBD_CLEAR_SOCK _IO( 0xab, 4 ) | |
| 23 | #define NBD_CLEAR_QUE _IO( 0xab, 5 ) | |
| 24 | #define NBD_PRINT_DEBUG _IO( 0xab, 6 ) | |
| 25 | #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) | |
| 26 | #define NBD_DISCONNECT _IO( 0xab, 8 ) | |
| 27 | ||
| 28 | enum { | |
| 29 | NBD_CMD_READ = 0, | |
| 30 | NBD_CMD_WRITE = 1, | |
| 31 | NBD_CMD_DISC = 2 | |
| 32 | }; | |
| 33 | ||
| 34 | #define nbd_cmd(req) ((req)->cmd[0]) | |
| 35 | #define MAX_NBD 128 | |
| 36 | ||
| 37 | /* userspace doesn't need the nbd_device structure */ | |
| 38 | #ifdef __KERNEL__ | |
| 39 | ||
| 4b2f0260 HX |
40 | #include <linux/wait.h> |
| 41 | ||
| 1da177e4 LT |
42 | /* values for flags field */ |
| 43 | #define NBD_READ_ONLY 0x0001 | |
| 44 | #define NBD_WRITE_NOCHK 0x0002 | |
| 45 | ||
| 4b2f0260 HX |
46 | struct request; |
| 47 | ||
| 1da177e4 LT |
48 | struct nbd_device { |
| 49 | int flags; | |
| 50 | int harderror; /* Code of hard error */ | |
| 51 | struct socket * sock; | |
| 52 | struct file * file; /* If == NULL, device is not ready, yet */ | |
| 53 | int magic; | |
| 4b2f0260 | 54 | |
| 1da177e4 LT |
55 | spinlock_t queue_lock; |
| 56 | struct list_head queue_head;/* Requests are added here... */ | |
| 4b2f0260 HX |
57 | struct request *active_req; |
| 58 | wait_queue_head_t active_wq; | |
| 59 | ||
| 1da177e4 LT |
60 | struct semaphore tx_lock; |
| 61 | struct gendisk *disk; | |
| 62 | int blksize; | |
| 63 | u64 bytesize; | |
| 64 | }; | |
| 65 | ||
| 66 | #endif | |
| 67 | ||
| 68 | /* These are sent over the network in the request/reply magic fields */ | |
| 69 | ||
| 70 | #define NBD_REQUEST_MAGIC 0x25609513 | |
| 71 | #define NBD_REPLY_MAGIC 0x67446698 | |
| 72 | /* Do *not* use magics: 0x12560953 0x96744668. */ | |
| 73 | ||
| 74 | /* | |
| 75 | * This is the packet used for communication between client and | |
| 76 | * server. All data are in network byte order. | |
| 77 | */ | |
| 78 | struct nbd_request { | |
| 79 | u32 magic; | |
| 80 | u32 type; /* == READ || == WRITE */ | |
| 81 | char handle[8]; | |
| 82 | u64 from; | |
| 83 | u32 len; | |
| 84 | } | |
| 85 | #ifdef __GNUC__ | |
| 86 | __attribute__ ((packed)) | |
| 87 | #endif | |
| 88 | ; | |
| 89 | ||
| 90 | /* | |
| 91 | * This is the reply packet that nbd-server sends back to the client after | |
| 92 | * it has completed an I/O request (or an error occurs). | |
| 93 | */ | |
| 94 | struct nbd_reply { | |
| 95 | u32 magic; | |
| 96 | u32 error; /* 0 = ok, else error */ | |
| 97 | char handle[8]; /* handle you got from request */ | |
| 98 | }; | |
| 99 | #endif |