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-rw-r--r--block/nbd-client.c18
-rw-r--r--include/block/nbd.h21
-rw-r--r--nbd/client.c4
-rw-r--r--nbd/nbd-internal.h34
-rw-r--r--nbd/server.c101
-rw-r--r--nbd/trace-events3
-rwxr-xr-xtests/qemu-iotests/nbd-fault-injector.py4
7 files changed, 89 insertions, 96 deletions
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 72651dcdb1..c0683c3c83 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -156,7 +156,6 @@ static int nbd_co_send_request(BlockDriverState *bs,
qio_channel_set_cork(s->ioc, true);
rc = nbd_send_request(s->ioc, request);
if (rc >= 0 && !s->quit) {
- assert(request->len == iov_size(qiov->iov, qiov->niov));
if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov,
NULL) < 0) {
rc = -EIO;
@@ -181,11 +180,11 @@ err:
}
static int nbd_co_receive_reply(NBDClientSession *s,
- NBDRequest *request,
+ uint64_t handle,
QEMUIOVector *qiov)
{
int ret;
- int i = HANDLE_TO_INDEX(s, request->handle);
+ int i = HANDLE_TO_INDEX(s, handle);
/* Wait until we're woken up by nbd_read_reply_entry. */
s->requests[i].receiving = true;
@@ -194,10 +193,9 @@ static int nbd_co_receive_reply(NBDClientSession *s,
if (!s->ioc || s->quit) {
ret = -EIO;
} else {
- assert(s->reply.handle == request->handle);
+ assert(s->reply.handle == handle);
ret = -s->reply.error;
if (qiov && s->reply.error == 0) {
- assert(request->len == iov_size(qiov->iov, qiov->niov));
if (qio_channel_readv_all(s->ioc, qiov->iov, qiov->niov,
NULL) < 0) {
ret = -EIO;
@@ -231,15 +229,19 @@ static int nbd_co_request(BlockDriverState *bs,
NBDClientSession *client = nbd_get_client_session(bs);
int ret;
- assert(!qiov || request->type == NBD_CMD_WRITE ||
- request->type == NBD_CMD_READ);
+ if (qiov) {
+ assert(request->type == NBD_CMD_WRITE || request->type == NBD_CMD_READ);
+ assert(request->len == iov_size(qiov->iov, qiov->niov));
+ } else {
+ assert(request->type != NBD_CMD_WRITE && request->type != NBD_CMD_READ);
+ }
ret = nbd_co_send_request(bs, request,
request->type == NBD_CMD_WRITE ? qiov : NULL);
if (ret < 0) {
return ret;
}
- return nbd_co_receive_reply(client, request,
+ return nbd_co_receive_reply(client, request->handle,
request->type == NBD_CMD_READ ? qiov : NULL);
}
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 707fd37575..a6df5ce8b5 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -63,15 +63,22 @@ struct NBDReply {
};
typedef struct NBDReply NBDReply;
+typedef struct NBDSimpleReply {
+ uint32_t magic; /* NBD_SIMPLE_REPLY_MAGIC */
+ uint32_t error;
+ uint64_t handle;
+} QEMU_PACKED NBDSimpleReply;
+
/* 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 */
-#define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */
-#define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */
-#define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */
-#define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm - rotational media */
-#define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */
-#define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send WRITE_ZEROES */
+#define NBD_FLAG_HAS_FLAGS (1 << 0) /* Flags are there */
+#define NBD_FLAG_READ_ONLY (1 << 1) /* Device is read-only */
+#define NBD_FLAG_SEND_FLUSH (1 << 2) /* Send FLUSH */
+#define NBD_FLAG_SEND_FUA (1 << 3) /* Send FUA (Force Unit Access) */
+#define NBD_FLAG_ROTATIONAL (1 << 4) /* Use elevator algorithm -
+ rotational media */
+#define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */
+#define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send WRITE_ZEROES */
/* New-style handshake (global) flags, sent from server to client, and
control what will happen during handshake phase. */
diff --git a/nbd/client.c b/nbd/client.c
index 68a0bc1ffc..cd5a2c80ac 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -931,7 +931,7 @@ int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
}
/* Reply
- [ 0 .. 3] magic (NBD_REPLY_MAGIC)
+ [ 0 .. 3] magic (NBD_SIMPLE_REPLY_MAGIC)
[ 4 .. 7] error (0 == no error)
[ 7 .. 15] handle
*/
@@ -949,7 +949,7 @@ int nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
}
trace_nbd_receive_reply(magic, reply->error, reply->handle);
- if (magic != NBD_REPLY_MAGIC) {
+ if (magic != NBD_SIMPLE_REPLY_MAGIC) {
error_setg(errp, "invalid magic (got 0x%" PRIx32 ")", magic);
return -EINVAL;
}
diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h
index 8a609a227f..11a130d050 100644
--- a/nbd/nbd-internal.h
+++ b/nbd/nbd-internal.h
@@ -46,23 +46,23 @@
/* Size of oldstyle negotiation */
#define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124)
-#define NBD_REQUEST_MAGIC 0x25609513
-#define NBD_REPLY_MAGIC 0x67446698
-#define NBD_OPTS_MAGIC 0x49484156454F5054LL
-#define NBD_CLIENT_MAGIC 0x0000420281861253LL
-#define NBD_REP_MAGIC 0x0003e889045565a9LL
-
-#define NBD_SET_SOCK _IO(0xab, 0)
-#define NBD_SET_BLKSIZE _IO(0xab, 1)
-#define NBD_SET_SIZE _IO(0xab, 2)
-#define NBD_DO_IT _IO(0xab, 3)
-#define NBD_CLEAR_SOCK _IO(0xab, 4)
-#define NBD_CLEAR_QUE _IO(0xab, 5)
-#define NBD_PRINT_DEBUG _IO(0xab, 6)
-#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
-#define NBD_DISCONNECT _IO(0xab, 8)
-#define NBD_SET_TIMEOUT _IO(0xab, 9)
-#define NBD_SET_FLAGS _IO(0xab, 10)
+#define NBD_REQUEST_MAGIC 0x25609513
+#define NBD_SIMPLE_REPLY_MAGIC 0x67446698
+#define NBD_OPTS_MAGIC 0x49484156454F5054LL
+#define NBD_CLIENT_MAGIC 0x0000420281861253LL
+#define NBD_REP_MAGIC 0x0003e889045565a9LL
+
+#define NBD_SET_SOCK _IO(0xab, 0)
+#define NBD_SET_BLKSIZE _IO(0xab, 1)
+#define NBD_SET_SIZE _IO(0xab, 2)
+#define NBD_DO_IT _IO(0xab, 3)
+#define NBD_CLEAR_SOCK _IO(0xab, 4)
+#define NBD_CLEAR_QUE _IO(0xab, 5)
+#define NBD_PRINT_DEBUG _IO(0xab, 6)
+#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
+#define NBD_DISCONNECT _IO(0xab, 8)
+#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.
diff --git a/nbd/server.c b/nbd/server.c
index 993ade30bb..3df3548d6d 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -902,26 +902,6 @@ static int nbd_receive_request(QIOChannel *ioc, NBDRequest *request,
return 0;
}
-static int nbd_send_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
-{
- uint8_t buf[NBD_REPLY_SIZE];
-
- reply->error = system_errno_to_nbd_errno(reply->error);
-
- trace_nbd_send_reply(reply->error, reply->handle);
-
- /* Reply
- [ 0 .. 3] magic (NBD_REPLY_MAGIC)
- [ 4 .. 7] error (0 == no error)
- [ 7 .. 15] handle
- */
- stl_be_p(buf, NBD_REPLY_MAGIC);
- stl_be_p(buf + 4, reply->error);
- stq_be_p(buf + 8, reply->handle);
-
- return nbd_write(ioc, buf, sizeof(buf), errp);
-}
-
#define MAX_NBD_REQUESTS 16
void nbd_client_get(NBDClient *client)
@@ -1047,7 +1027,7 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset, off_t size,
{
AioContext *ctx;
BlockBackend *blk;
- NBDExport *exp = g_malloc0(sizeof(NBDExport));
+ NBDExport *exp = g_new0(NBDExport, 1);
uint64_t perm;
int ret;
@@ -1208,38 +1188,51 @@ void nbd_export_close_all(void)
}
}
-static int nbd_co_send_reply(NBDRequestData *req, NBDReply *reply, int len,
- Error **errp)
+static int coroutine_fn nbd_co_send_iov(NBDClient *client, struct iovec *iov,
+ unsigned niov, Error **errp)
{
- NBDClient *client = req->client;
int ret;
g_assert(qemu_in_coroutine());
-
- trace_nbd_co_send_reply(reply->handle, reply->error, len);
-
qemu_co_mutex_lock(&client->send_lock);
client->send_coroutine = qemu_coroutine_self();
- if (!len) {
- ret = nbd_send_reply(client->ioc, reply, errp);
- } else {
- qio_channel_set_cork(client->ioc, true);
- ret = nbd_send_reply(client->ioc, reply, errp);
- if (ret == 0) {
- ret = nbd_write(client->ioc, req->data, len, errp);
- if (ret < 0) {
- ret = -EIO;
- }
- }
- qio_channel_set_cork(client->ioc, false);
- }
+ ret = qio_channel_writev_all(client->ioc, iov, niov, errp) < 0 ? -EIO : 0;
client->send_coroutine = NULL;
qemu_co_mutex_unlock(&client->send_lock);
+
return ret;
}
+static inline void set_be_simple_reply(NBDSimpleReply *reply, uint64_t error,
+ uint64_t handle)
+{
+ stl_be_p(&reply->magic, NBD_SIMPLE_REPLY_MAGIC);
+ stl_be_p(&reply->error, error);
+ stq_be_p(&reply->handle, handle);
+}
+
+static int nbd_co_send_simple_reply(NBDClient *client,
+ uint64_t handle,
+ uint32_t error,
+ void *data,
+ size_t len,
+ Error **errp)
+{
+ NBDSimpleReply reply;
+ int nbd_err = system_errno_to_nbd_errno(error);
+ struct iovec iov[] = {
+ {.iov_base = &reply, .iov_len = sizeof(reply)},
+ {.iov_base = data, .iov_len = len}
+ };
+
+ trace_nbd_co_send_simple_reply(handle, nbd_err, len);
+ set_be_simple_reply(&reply, nbd_err, handle);
+
+ return nbd_co_send_iov(client, iov, len ? 2 : 1, errp);
+}
+
/* nbd_co_receive_request
* Collect a client request. Return 0 if request looks valid, -EIO to drop
* connection right away, and any other negative value to report an error to
@@ -1331,7 +1324,6 @@ static coroutine_fn void nbd_trip(void *opaque)
NBDExport *exp = client->exp;
NBDRequestData *req;
NBDRequest request = { 0 }; /* GCC thinks it can be used uninitialized */
- NBDReply reply;
int ret;
int flags;
int reply_data_len = 0;
@@ -1351,11 +1343,7 @@ static coroutine_fn void nbd_trip(void *opaque)
goto disconnect;
}
- reply.handle = request.handle;
- reply.error = 0;
-
if (ret < 0) {
- reply.error = -ret;
goto reply;
}
@@ -1374,7 +1362,6 @@ static coroutine_fn void nbd_trip(void *opaque)
ret = blk_co_flush(exp->blk);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "flush failed");
- reply.error = -ret;
break;
}
}
@@ -1383,7 +1370,6 @@ static coroutine_fn void nbd_trip(void *opaque)
req->data, request.len);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "reading from file failed");
- reply.error = -ret;
break;
}
@@ -1392,7 +1378,7 @@ static coroutine_fn void nbd_trip(void *opaque)
break;
case NBD_CMD_WRITE:
if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
- reply.error = EROFS;
+ ret = -EROFS;
break;
}
@@ -1404,14 +1390,13 @@ static coroutine_fn void nbd_trip(void *opaque)
req->data, request.len, flags);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "writing to file failed");
- reply.error = -ret;
}
break;
case NBD_CMD_WRITE_ZEROES:
if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
error_setg(&local_err, "Server is read-only, return error");
- reply.error = EROFS;
+ ret = -EROFS;
break;
}
@@ -1426,7 +1411,6 @@ static coroutine_fn void nbd_trip(void *opaque)
request.len, flags);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "writing to file failed");
- reply.error = -ret;
}
break;
@@ -1438,7 +1422,6 @@ static coroutine_fn void nbd_trip(void *opaque)
ret = blk_co_flush(exp->blk);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "flush failed");
- reply.error = -ret;
}
break;
@@ -1447,25 +1430,27 @@ static coroutine_fn void nbd_trip(void *opaque)
request.len);
if (ret < 0) {
error_setg_errno(&local_err, -ret, "discard failed");
- reply.error = -ret;
}
break;
default:
error_setg(&local_err, "invalid request type (%" PRIu32 ") received",
request.type);
- reply.error = EINVAL;
+ ret = -EINVAL;
}
reply:
if (local_err) {
- /* If we are here local_err is not fatal error, already stored in
- * reply.error */
+ /* If we get here, local_err was not a fatal error, and should be sent
+ * to the client. */
error_report_err(local_err);
local_err = NULL;
}
- if (nbd_co_send_reply(req, &reply, reply_data_len, &local_err) < 0) {
+ if (nbd_co_send_simple_reply(req->client, request.handle,
+ ret < 0 ? -ret : 0,
+ req->data, reply_data_len, &local_err) < 0)
+ {
error_prepend(&local_err, "Failed to send reply: ");
goto disconnect;
}
@@ -1539,7 +1524,7 @@ void nbd_client_new(NBDExport *exp,
NBDClient *client;
Coroutine *co;
- client = g_malloc0(sizeof(NBDClient));
+ client = g_new0(NBDClient, 1);
client->refcount = 1;
client->exp = exp;
client->tlscreds = tlscreds;
diff --git a/nbd/trace-events b/nbd/trace-events
index 48a4f27682..e27614f050 100644
--- a/nbd/trace-events
+++ b/nbd/trace-events
@@ -51,10 +51,9 @@ nbd_negotiate_old_style(uint64_t size, unsigned flags) "advertising size %" PRIu
nbd_negotiate_new_style_size_flags(uint64_t size, unsigned flags) "advertising size %" PRIu64 " and flags 0x%x"
nbd_negotiate_success(void) "Negotiation succeeded"
nbd_receive_request(uint32_t magic, uint16_t flags, uint16_t type, uint64_t from, uint32_t len) "Got request: { magic = 0x%" PRIx32 ", .flags = 0x%" PRIx16 ", .type = 0x%" PRIx16 ", from = %" PRIu64 ", len = %" PRIu32 " }"
-nbd_send_reply(int32_t error, uint64_t handle) "Sending response to client: { .error = %" PRId32 ", handle = %" PRIu64 " }"
nbd_blk_aio_attached(const char *name, void *ctx) "Export %s: Attaching clients to AIO context %p\n"
nbd_blk_aio_detach(const char *name, void *ctx) "Export %s: Detaching clients from AIO context %p\n"
-nbd_co_send_reply(uint64_t handle, uint32_t error, int len) "Send reply: handle = %" PRIu64 ", error = %" PRIu32 ", len = %d"
+nbd_co_send_simple_reply(uint64_t handle, uint32_t error, int len) "Send simple reply: handle = %" PRIu64 ", error = %" PRIu32 ", len = %d"
nbd_co_receive_request_decode_type(uint64_t handle, uint16_t type, const char *name) "Decoding type: handle = %" PRIu64 ", type = %" PRIu16 " (%s)"
nbd_co_receive_request_payload_received(uint64_t handle, uint32_t len) "Payload received: handle = %" PRIu64 ", len = %" PRIu32
nbd_co_receive_request_cmd_write(uint32_t len) "Reading %" PRIu32 " byte(s)"
diff --git a/tests/qemu-iotests/nbd-fault-injector.py b/tests/qemu-iotests/nbd-fault-injector.py
index 1c10dcb51c..8a04d979aa 100755
--- a/tests/qemu-iotests/nbd-fault-injector.py
+++ b/tests/qemu-iotests/nbd-fault-injector.py
@@ -56,7 +56,7 @@ NBD_CMD_READ = 0
NBD_CMD_WRITE = 1
NBD_CMD_DISC = 2
NBD_REQUEST_MAGIC = 0x25609513
-NBD_REPLY_MAGIC = 0x67446698
+NBD_SIMPLE_REPLY_MAGIC = 0x67446698
NBD_PASSWD = 0x4e42444d41474943
NBD_OPTS_MAGIC = 0x49484156454F5054
NBD_CLIENT_MAGIC = 0x0000420281861253
@@ -166,7 +166,7 @@ def read_request(conn):
return req
def write_reply(conn, error, handle):
- buf = reply_struct.pack(NBD_REPLY_MAGIC, error, handle)
+ buf = reply_struct.pack(NBD_SIMPLE_REPLY_MAGIC, error, handle)
conn.send(buf, event='reply')
def handle_connection(conn, use_export):
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-28 06:22:23 +0000