diff options
| -rw-r--r-- | nbd.c | 57 |
1 files changed, 57 insertions, 0 deletions
@@ -86,6 +86,59 @@ #define NBD_OPT_ABORT (2) #define NBD_OPT_LIST (3) +/* NBD errors are based on errno numbers, so there is a 1:1 mapping, + * but only a limited set of errno values is specified in the protocol. + * Everything else is squashed to EINVAL. + */ +#define NBD_SUCCESS 0 +#define NBD_EPERM 1 +#define NBD_EIO 5 +#define NBD_ENOMEM 12 +#define NBD_EINVAL 22 +#define NBD_ENOSPC 28 + +static int system_errno_to_nbd_errno(int err) +{ + switch (err) { + case 0: + return NBD_SUCCESS; + case EPERM: + return NBD_EPERM; + case EIO: + return NBD_EIO; + case ENOMEM: + return NBD_ENOMEM; +#ifdef EDQUOT + case EDQUOT: +#endif + case EFBIG: + case ENOSPC: + return NBD_ENOSPC; + case EINVAL: + default: + return NBD_EINVAL; + } +} + +static int nbd_errno_to_system_errno(int err) +{ + switch (err) { + case NBD_SUCCESS: + return 0; + case NBD_EPERM: + return EPERM; + case NBD_EIO: + return EIO; + case NBD_ENOMEM: + return ENOMEM; + case NBD_ENOSPC: + return ENOSPC; + case NBD_EINVAL: + default: + return EINVAL; + } +} + /* Definitions for opaque data types */ typedef struct NBDRequest NBDRequest; @@ -856,6 +909,8 @@ ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply) reply->error = be32_to_cpup((uint32_t*)(buf + 4)); reply->handle = be64_to_cpup((uint64_t*)(buf + 8)); + reply->error = nbd_errno_to_system_errno(reply->error); + TRACE("Got reply: " "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", magic, reply->error, reply->handle); @@ -872,6 +927,8 @@ static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply) uint8_t buf[NBD_REPLY_SIZE]; ssize_t ret; + reply->error = system_errno_to_nbd_errno(reply->error); + /* Reply [ 0 .. 3] magic (NBD_REPLY_MAGIC) [ 4 .. 7] error (0 == no error) |