| /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ |
| /* |
| * 1999 Copyright (C) Pavel Machek, [email protected]. This code is GPL. |
| * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne) |
| * Made nbd_end_request() use the io_request_lock |
| * 2001 Copyright (C) Steven Whitehouse |
| * New nbd_end_request() for compatibility with new linux block |
| * layer code. |
| * 2003/06/24 Louis D. Langholtz <[email protected]> |
| * Removed unneeded blksize_bits field from nbd_device struct. |
| * Cleanup PARANOIA usage & code. |
| * 2004/02/19 Paul Clements |
| * Removed PARANOIA, plus various cleanup and comments |
| */ |
| |
| #ifndef _UAPILINUX_NBD_H |
| #define _UAPILINUX_NBD_H |
| |
| #include <linux/types.h> |
| |
| #define NBD_SET_SOCK _IO( 0xab, 0 ) |
| #define NBD_SET_BLKSIZE _IO( 0xab, 1 ) |
| #define NBD_SET_SIZE _IO( 0xab, 2 ) |
| #define NBD_DO_IT _IO( 0xab, 3 ) |
| #define NBD_CLEAR_SOCK _IO( 0xab, 4 ) |
| #define NBD_CLEAR_QUE _IO( 0xab, 5 ) |
| #define NBD_PRINT_DEBUG _IO( 0xab, 6 ) |
| #define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) |
| #define NBD_DISCONNECT _IO( 0xab, 8 ) |
| #define NBD_SET_TIMEOUT _IO( 0xab, 9 ) |
| #define NBD_SET_FLAGS _IO( 0xab, 10) |
| |
| enum { |
| NBD_CMD_READ = 0, |
| NBD_CMD_WRITE = 1, |
| NBD_CMD_DISC = 2, |
| NBD_CMD_FLUSH = 3, |
| NBD_CMD_TRIM = 4 |
| }; |
| |
| /* values for flags field, these are server interaction specific. */ |
| #define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */ |
| #define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */ |
| #define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */ |
| #define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */ |
| /* there is a gap here to match userspace */ |
| #define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */ |
| #define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */ |
| |
| /* values for cmd flags in the upper 16 bits of request type */ |
| #define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */ |
| |
| /* These are client behavior specific flags. */ |
| #define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on |
| disconnect. */ |
| #define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1) /* disconnect the nbd device on |
| * close by last opener. |
| */ |
| |
| /* userspace doesn't need the nbd_device structure */ |
| |
| /* These are sent over the network in the request/reply magic fields */ |
| |
| #define NBD_REQUEST_MAGIC 0x25609513 |
| #define NBD_REPLY_MAGIC 0x67446698 |
| /* Do *not* use magics: 0x12560953 0x96744668. */ |
| |
| /* |
| * This is the packet used for communication between client and |
| * server. All data are in network byte order. |
| */ |
| struct nbd_request { |
| __be32 magic; |
| __be32 type; /* == READ || == WRITE */ |
| char handle[8]; |
| __be64 from; |
| __be32 len; |
| } __attribute__((packed)); |
| |
| /* |
| * This is the reply packet that nbd-server sends back to the client after |
| * it has completed an I/O request (or an error occurs). |
| */ |
| struct nbd_reply { |
| __be32 magic; |
| __be32 error; /* 0 = ok, else error */ |
| char handle[8]; /* handle you got from request */ |
| }; |
| #endif /* _UAPILINUX_NBD_H */ |
