diff options
Diffstat (limited to 'original/uapi/linux/nbd.h')
| -rw-r--r-- | original/uapi/linux/nbd.h | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/original/uapi/linux/nbd.h b/original/uapi/linux/nbd.h index 20d6cc9..80ce0ef 100644 --- a/original/uapi/linux/nbd.h +++ b/original/uapi/linux/nbd.h @@ -11,6 +11,8 @@ * Cleanup PARANOIA usage & code. * 2004/02/19 Paul Clements * Removed PARANOIA, plus various cleanup and comments + * 2023 Copyright Red Hat + * Link to userspace extensions, favor cookie over handle. */ #ifndef _UAPILINUX_NBD_H @@ -30,12 +32,18 @@ #define NBD_SET_TIMEOUT _IO( 0xab, 9 ) #define NBD_SET_FLAGS _IO( 0xab, 10) +/* + * See also https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md + * for additional userspace extensions not yet utilized in the kernel module. + */ + enum { NBD_CMD_READ = 0, NBD_CMD_WRITE = 1, NBD_CMD_DISC = 2, NBD_CMD_FLUSH = 3, NBD_CMD_TRIM = 4 + /* userspace defines additional extension commands */ }; /* values for flags field, these are server interaction specific. */ @@ -64,15 +72,19 @@ enum { #define NBD_REQUEST_MAGIC 0x25609513 #define NBD_REPLY_MAGIC 0x67446698 /* Do *not* use magics: 0x12560953 0x96744668. */ +/* magic 0x668e33ef for structured reply not supported by kernel yet */ /* * This is the packet used for communication between client and * server. All data are in network byte order. */ struct nbd_request { - __be32 magic; - __be32 type; /* == READ || == WRITE */ - char handle[8]; + __be32 magic; /* NBD_REQUEST_MAGIC */ + __be32 type; /* See NBD_CMD_* */ + union { + __be64 cookie; /* Opaque identifier for request */ + char handle[8]; /* older spelling of cookie */ + }; __be64 from; __be32 len; } __attribute__((packed)); @@ -82,8 +94,11 @@ struct nbd_request { * it has completed an I/O request (or an error occurs). */ struct nbd_reply { - __be32 magic; + __be32 magic; /* NBD_REPLY_MAGIC */ __be32 error; /* 0 = ok, else error */ - char handle[8]; /* handle you got from request */ + union { + __be64 cookie; /* Opaque identifier from request */ + char handle[8]; /* older spelling of cookie */ + }; }; #endif /* _UAPILINUX_NBD_H */ |