diff options
| -rw-r--r-- | include/block/nbd.h | 31 | ||||
| -rw-r--r-- | nbd/common.c | 10 |
2 files changed, 41 insertions, 0 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h index ef1698914b..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 */ @@ -136,6 +155,8 @@ typedef struct NBDStructuredError { #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)) @@ -143,6 +164,7 @@ typedef struct NBDStructuredError { #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); diff --git a/nbd/common.c b/nbd/common.c index 6295526dd1..8c95c1d606 100644 --- a/nbd/common.c +++ b/nbd/common.c @@ -75,6 +75,10 @@ const char *nbd_opt_lookup(uint32_t opt) return "go"; case NBD_OPT_STRUCTURED_REPLY: return "structured reply"; + case NBD_OPT_LIST_META_CONTEXT: + return "list meta context"; + case NBD_OPT_SET_META_CONTEXT: + return "set meta context"; default: return "<unknown>"; } @@ -90,6 +94,8 @@ const char *nbd_rep_lookup(uint32_t rep) return "server"; case NBD_REP_INFO: return "info"; + case NBD_REP_META_CONTEXT: + return "meta context"; case NBD_REP_ERR_UNSUP: return "unsupported"; case NBD_REP_ERR_POLICY: @@ -144,6 +150,8 @@ const char *nbd_cmd_lookup(uint16_t cmd) return "trim"; case NBD_CMD_WRITE_ZEROES: return "write zeroes"; + case NBD_CMD_BLOCK_STATUS: + return "block status"; default: return "<unknown>"; } @@ -159,6 +167,8 @@ const char *nbd_reply_type_lookup(uint16_t type) return "data"; case NBD_REPLY_TYPE_OFFSET_HOLE: return "hole"; + case NBD_REPLY_TYPE_BLOCK_STATUS: + return "block status"; case NBD_REPLY_TYPE_ERROR: return "generic error"; case NBD_REPLY_TYPE_ERROR_OFFSET: |