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nbd: Create struct for tracking export info

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The NBD Protocol is introducing some additional information
about exports, such as minimum request size and alignment, as
well as an advertised maximum request size.  It will be easier
to feed this information back to the block layer if we gather
all the information into a struct, rather than adding yet more
pointer parameters during negotiation.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170707203049.534-2-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2017-07-07 15:30:41 -05:00 • committed by Paolo Bonzini
parent 1221a47467
commit 004a89fce9
6 changed files with 47 additions and 45 deletions
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15
include/block/nbd.h
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@ -123,13 +123,20 @@ enum {
* aren't overflowing some other buffer. */
#define NBD_MAX_NAME_SIZE 256
/* Details collected by NBD_OPT_EXPORT_NAME and NBD_OPT_GO */
struct NBDExportInfo {
uint64_t size;
uint16_t flags;
};
typedef struct NBDExportInfo NBDExportInfo;
ssize_t nbd_rwv(QIOChannel *ioc, struct iovec *iov, size_t niov, size_t length,
bool do_read, Error **errp);
int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
QCryptoTLSCreds *tlscreds, const char *hostname,
QIOChannel **outioc,
off_t *size, Error **errp);
int nbd_init(int fd, QIOChannelSocket *sioc, uint16_t flags, off_t size,
QIOChannel **outioc, NBDExportInfo *info,
Error **errp);
int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
Error **errp);
ssize_t nbd_send_request(QIOChannel *ioc, NBDRequest *request);
ssize_t nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp);