diff options
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/nbd.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h index fd58390d5d..5fe2670fdb 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -1,4 +1,5 @@ /* + * Copyright (C) 2016 Red Hat, Inc. * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> * * Network Block Device @@ -32,7 +33,8 @@ struct nbd_request { uint64_t handle; uint64_t from; uint32_t len; - uint32_t type; + uint16_t flags; + uint16_t type; }; struct nbd_reply { @@ -40,6 +42,8 @@ struct nbd_reply { uint32_t error; }; +/* Transmission (export) flags: sent from server to client during handshake, + but describe what will happen during transmission */ #define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */ #define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */ #define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */ @@ -47,10 +51,12 @@ struct nbd_reply { #define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */ #define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */ -/* New-style global flags. */ +/* New-style handshake (global) flags, sent from server to client, and + control what will happen during handshake phase. */ #define NBD_FLAG_FIXED_NEWSTYLE (1 << 0) /* Fixed newstyle protocol. */ -/* New-style client flags. */ +/* New-style client flags, sent from client to server to control what happens + during handshake phase. */ #define NBD_FLAG_C_FIXED_NEWSTYLE (1 << 0) /* Fixed newstyle protocol. */ /* Reply types. */ @@ -61,10 +67,10 @@ struct nbd_reply { #define NBD_REP_ERR_INVALID ((UINT32_C(1) << 31) | 3) /* Invalid length. */ #define NBD_REP_ERR_TLS_REQD ((UINT32_C(1) << 31) | 5) /* TLS required */ +/* Request flags, sent from client to server during transmission phase */ +#define NBD_CMD_FLAG_FUA (1 << 0) -#define NBD_CMD_MASK_COMMAND 0x0000ffff -#define NBD_CMD_FLAG_FUA (1 << 16) - +/* Supported request types */ enum { NBD_CMD_READ = 0, NBD_CMD_WRITE = 1, |