1 /* 2 * NBD Internal Declarations 3 * 4 * Copyright Red Hat 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 */ 9 10 #ifndef NBD_INTERNAL_H 11 #define NBD_INTERNAL_H 12 #include "block/nbd.h" 13 #include "sysemu/block-backend.h" 14 #include "io/channel-tls.h" 15 16 #include "qemu/iov.h" 17 18 #ifndef _WIN32 19 #include <sys/ioctl.h> 20 #endif 21 #ifdef HAVE_SYS_IOCCOM_H 22 #include <sys/ioccom.h> 23 #endif 24 25 #ifdef __linux__ 26 #include <linux/fs.h> 27 #endif 28 29 #include "qemu/bswap.h" 30 31 /* This is all part of the "official" NBD API. 32 * 33 * The most up-to-date documentation is available at: 34 * https://github.com/yoe/nbd/blob/master/doc/proto.md 35 */ 36 37 /* Size of all compact NBD_CMD_*, without payload */ 38 #define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4) 39 /* Size of all extended NBD_CMD_*, without payload */ 40 #define NBD_EXTENDED_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 8) 41 42 /* Size of all NBD_REP_* sent in answer to most NBD_OPT_*, without payload */ 43 #define NBD_REPLY_SIZE (4 + 4 + 8) 44 /* Size of reply to NBD_OPT_EXPORT_NAME */ 45 #define NBD_REPLY_EXPORT_NAME_SIZE (8 + 2 + 124) 46 /* Size of oldstyle negotiation */ 47 #define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124) 48 49 #define NBD_INIT_MAGIC 0x4e42444d41474943LL /* ASCII "NBDMAGIC" */ 50 #define NBD_OPTS_MAGIC 0x49484156454F5054LL /* ASCII "IHAVEOPT" */ 51 #define NBD_CLIENT_MAGIC 0x0000420281861253LL 52 #define NBD_REP_MAGIC 0x0003e889045565a9LL 53 54 #define NBD_SET_SOCK _IO(0xab, 0) 55 #define NBD_SET_BLKSIZE _IO(0xab, 1) 56 #define NBD_SET_SIZE _IO(0xab, 2) 57 #define NBD_DO_IT _IO(0xab, 3) 58 #define NBD_CLEAR_SOCK _IO(0xab, 4) 59 #define NBD_CLEAR_QUE _IO(0xab, 5) 60 #define NBD_PRINT_DEBUG _IO(0xab, 6) 61 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) 62 #define NBD_DISCONNECT _IO(0xab, 8) 63 #define NBD_SET_TIMEOUT _IO(0xab, 9) 64 #define NBD_SET_FLAGS _IO(0xab, 10) 65 66 /* nbd_write 67 * Writes @size bytes to @ioc. Returns 0 on success. 68 */ nbd_write(QIOChannel * ioc,const void * buffer,size_t size,Error ** errp)69 static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size, 70 Error **errp) 71 { 72 return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0; 73 } 74 75 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp); 76 77 #endif 78