diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/nbd.h | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h index fc50003003..495564c73a 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -41,6 +41,12 @@ struct NBDOptionReply { } QEMU_PACKED; typedef struct NBDOptionReply NBDOptionReply; +typedef struct NBDOptionReplyMetaContext { + NBDOptionReply h; /* h.type = NBD_REP_META_CONTEXT, h.length > 4 */ + uint32_t context_id; + /* meta context name follows */ +} QEMU_PACKED NBDOptionReplyMetaContext; + /* Transmission phase structs * * Note: these are _NOT_ the same as the network representation of an NBD @@ -105,6 +111,19 @@ typedef struct NBDStructuredError { uint16_t message_length; } QEMU_PACKED NBDStructuredError; +/* Header of NBD_REPLY_TYPE_BLOCK_STATUS */ +typedef struct NBDStructuredMeta { + NBDStructuredReplyChunk h; /* h.length >= 12 (at least one extent) */ + uint32_t context_id; + /* extents follows */ +} QEMU_PACKED NBDStructuredMeta; + +/* Extent chunk for NBD_REPLY_TYPE_BLOCK_STATUS */ +typedef struct NBDExtent { + uint32_t length; + uint32_t flags; /* NBD_STATE_* */ +} QEMU_PACKED NBDExtent; + /* 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 */ @@ -128,21 +147,24 @@ typedef struct NBDStructuredError { #define NBD_FLAG_C_NO_ZEROES (1 << 1) /* End handshake without zeroes. */ /* Option requests. */ -#define NBD_OPT_EXPORT_NAME (1) -#define NBD_OPT_ABORT (2) -#define NBD_OPT_LIST (3) -/* #define NBD_OPT_PEEK_EXPORT (4) not in use */ -#define NBD_OPT_STARTTLS (5) -#define NBD_OPT_INFO (6) -#define NBD_OPT_GO (7) -#define NBD_OPT_STRUCTURED_REPLY (8) +#define NBD_OPT_EXPORT_NAME (1) +#define NBD_OPT_ABORT (2) +#define NBD_OPT_LIST (3) +/* #define NBD_OPT_PEEK_EXPORT (4) not in use */ +#define NBD_OPT_STARTTLS (5) +#define NBD_OPT_INFO (6) +#define NBD_OPT_GO (7) +#define NBD_OPT_STRUCTURED_REPLY (8) +#define NBD_OPT_LIST_META_CONTEXT (9) +#define NBD_OPT_SET_META_CONTEXT (10) /* Option reply types. */ #define NBD_REP_ERR(value) ((UINT32_C(1) << 31) | (value)) -#define NBD_REP_ACK (1) /* Data sending finished. */ -#define NBD_REP_SERVER (2) /* Export description. */ -#define NBD_REP_INFO (3) /* NBD_OPT_INFO/GO. */ +#define NBD_REP_ACK (1) /* Data sending finished. */ +#define NBD_REP_SERVER (2) /* Export description. */ +#define NBD_REP_INFO (3) /* NBD_OPT_INFO/GO. */ +#define NBD_REP_META_CONTEXT (4) /* NBD_OPT_{LIST,SET}_META_CONTEXT */ #define NBD_REP_ERR_UNSUP NBD_REP_ERR(1) /* Unknown option */ #define NBD_REP_ERR_POLICY NBD_REP_ERR(2) /* Server denied */ @@ -163,6 +185,8 @@ typedef struct NBDStructuredError { #define NBD_CMD_FLAG_FUA (1 << 0) /* 'force unit access' during write */ #define NBD_CMD_FLAG_NO_HOLE (1 << 1) /* don't punch hole on zero run */ #define NBD_CMD_FLAG_DF (1 << 2) /* don't fragment structured read */ +#define NBD_CMD_FLAG_REQ_ONE (1 << 3) /* only one extent in BLOCK_STATUS + * reply chunk */ /* Supported request types */ enum { @@ -173,6 +197,7 @@ enum { NBD_CMD_TRIM = 4, /* 5 reserved for failed experiment NBD_CMD_CACHE */ NBD_CMD_WRITE_ZEROES = 6, + NBD_CMD_BLOCK_STATUS = 7, }; #define NBD_DEFAULT_PORT 10809 @@ -200,9 +225,15 @@ enum { #define NBD_REPLY_TYPE_NONE 0 #define NBD_REPLY_TYPE_OFFSET_DATA 1 #define NBD_REPLY_TYPE_OFFSET_HOLE 2 +#define NBD_REPLY_TYPE_BLOCK_STATUS 5 #define NBD_REPLY_TYPE_ERROR NBD_REPLY_ERR(1) #define NBD_REPLY_TYPE_ERROR_OFFSET NBD_REPLY_ERR(2) +/* Flags for extents (NBDExtent.flags) of NBD_REPLY_TYPE_BLOCK_STATUS, + * for base:allocation meta context */ +#define NBD_STATE_HOLE (1 << 0) +#define NBD_STATE_ZERO (1 << 1) + static inline bool nbd_reply_type_is_error(int type) { return type & (1 << 15); |