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nbd: Move nbd_errno_to_system_errno() to public header

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This is needed in preparation for structured reply handling,
as we will be performing the translation from NBD error to
system errno value higher in the stack at block/nbd-client.c.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20171027104037.8319-3-eblake@redhat.com>
This commit is contained in:
Eric Blake 2017-10-27 12:40:27 +02:00
parent e7a78d0eff
commit dd68944049
5 changed files with 50 additions and 45 deletions
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13
include/block/nbd.h
View File

@ -149,6 +149,18 @@ enum {
* aren't overflowing some other buffer. */
#define NBD_MAX_NAME_SIZE 256
/* 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
#define NBD_ESHUTDOWN 108
/* Details collected by NBD_OPT_EXPORT_NAME and NBD_OPT_GO */
struct NBDExportInfo {
/* Set by client before nbd_receive_negotiate() */
@ -172,6 +184,7 @@ int nbd_send_request(QIOChannel *ioc, NBDRequest *request);
int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp);
int nbd_client(int fd);
int nbd_disconnect(int fd);
int nbd_errno_to_system_errno(int err);
typedef struct NBDExport NBDExport;
typedef struct NBDClient NBDClient;

32
nbd/client.c
View File

@ -22,38 +22,6 @@
#include "trace.h"
#include "nbd-internal.h"
static int nbd_errno_to_system_errno(int err)
{
int ret;
switch (err) {
case NBD_SUCCESS:
ret = 0;
break;
case NBD_EPERM:
ret = EPERM;
break;
case NBD_EIO:
ret = EIO;
break;
case NBD_ENOMEM:
ret = ENOMEM;
break;
case NBD_ENOSPC:
ret = ENOSPC;
break;
case NBD_ESHUTDOWN:
ret = ESHUTDOWN;
break;
default:
trace_nbd_unknown_error(err);
/* fallthrough */
case NBD_EINVAL:
ret = EINVAL;
break;
}
return ret;
}
/* Definitions for opaque data types */
static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);

34
nbd/common.c
View File

@ -18,6 +18,7 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "trace.h"
#include "nbd-internal.h"
/* Discard length bytes from channel. Return -errno on failure and 0 on
@ -171,3 +172,36 @@ const char *nbd_err_lookup(int err)
return "<unknown>";
}
}
int nbd_errno_to_system_errno(int err)
{
int ret;
switch (err) {
case NBD_SUCCESS:
ret = 0;
break;
case NBD_EPERM:
ret = EPERM;
break;
case NBD_EIO:
ret = EIO;
break;
case NBD_ENOMEM:
ret = ENOMEM;
break;
case NBD_ENOSPC:
ret = ENOSPC;
break;
case NBD_ESHUTDOWN:
ret = ESHUTDOWN;
break;
default:
trace_nbd_unknown_error(err);
/* fallthrough */
case NBD_EINVAL:
ret = EINVAL;
break;
}
return ret;
}

12
nbd/nbd-internal.h
View File

@ -64,18 +64,6 @@
#define NBD_SET_TIMEOUT _IO(0xab, 9)
#define NBD_SET_FLAGS _IO(0xab, 10)
/* 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
#define NBD_ESHUTDOWN 108
/* nbd_read_eof
* Tries to read @size bytes from @ioc.
* Returns 1 on success

4
nbd/trace-events
View File

@ -1,5 +1,4 @@
# nbd/client.c
nbd_unknown_error(int err) "Squashing unexpected error %d to EINVAL"
nbd_send_option_request(uint32_t opt, const char *name, uint32_t len) "Sending option request %" PRIu32" (%s), len %" PRIu32
nbd_receive_option_reply(uint32_t option, const char *optname, uint32_t type, const char *typename, uint32_t length) "Received option reply 0x%" PRIx32" (%s), type 0x%" PRIx32" (%s), len %" PRIu32
nbd_reply_err_unsup(uint32_t option, const char *name) "server doesn't understand request 0x%" PRIx32 " (%s), attempting fallback"
@ -31,6 +30,9 @@ nbd_client_clear_socket(void) "Clearing NBD socket"
nbd_send_request(uint64_t from, uint32_t len, uint64_t handle, uint16_t flags, uint16_t type, const char *name) "Sending request to server: { .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .flags = 0x%" PRIx16 ", .type = %" PRIu16 " (%s) }"
nbd_receive_reply(uint32_t magic, int32_t error, const char *errname, uint64_t handle) "Got reply: { magic = 0x%" PRIx32 ", .error = %" PRId32 " (%s), handle = %" PRIu64" }"
# nbd/common.c
nbd_unknown_error(int err) "Squashing unexpected error %d to EINVAL"
# nbd/server.c
nbd_negotiate_send_rep_len(uint32_t opt, const char *optname, uint32_t type, const char *typename, uint32_t len) "Reply opt=0x%" PRIx32 " (%s), type=0x%" PRIx32 " (%s), len=%" PRIu32
nbd_negotiate_send_rep_err(const char *msg) "sending error message \"%s\""