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[Qemu-devel] [PATCH] nbd: generalize usage of nbd_read
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH] nbd: generalize usage of nbd_read |
Date: |
Mon, 28 Jan 2019 19:58:30 +0300 |
We generally do very similar things around nbd_read: error_prepend,
specifying, what we have tried to read and be_to_cpu conversion of
integers.
So, it seems reasonable to move common things to helper functions,
which:
1. simplify code a bit
2. generalize nbd_read error descriptions, all starting with
"Failed to read"
3. make it more difficult to forget to convert things from BE
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
include/block/nbd.h | 31 ++++++++++++++--
block/nbd-client.c | 5 ++-
nbd/client.c | 88 +++++++++++++++------------------------------
nbd/common.c | 2 +-
nbd/server.c | 27 +++++---------
5 files changed, 70 insertions(+), 83 deletions(-)
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 4faf394e34..e58453437c 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -23,6 +23,7 @@
#include "qapi/qapi-types-block.h"
#include "io/channel-socket.h"
#include "crypto/tlscreds.h"
+#include "qapi/error.h"
/* Handshake phase structs - this struct is passed on the wire */
@@ -336,11 +337,37 @@ void nbd_server_start(SocketAddress *addr, const char
*tls_creds,
* Reads @size bytes from @ioc. Returns 0 on success.
*/
static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size,
- Error **errp)
+ const char *desc, Error **errp)
{
- return qio_channel_read_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
+ int ret = qio_channel_read_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
+
+ if (ret < 0) {
+ if (desc) {
+ error_prepend(errp, "Failed to read %s: ", desc);
+ }
+ return -1;
+ }
+
+ return 0;
+}
+
+#define DEF_NBD_READ(bits) \
+static inline int nbd_read ## bits(QIOChannel *ioc, uint ## bits ## _t * val, \
+ const char *desc, Error **errp) \
+{ \
+ if (nbd_read(ioc, val, sizeof(*val), desc, errp) < 0) { \
+ return -1; \
+ } \
+ *val = be ## bits ## _to_cpu(*val); \
+ return 0; \
}
+DEF_NBD_READ(16) /* Defines nbd_read16(). */
+DEF_NBD_READ(32) /* Defines nbd_read32(). */
+DEF_NBD_READ(64) /* Defines nbd_read64(). */
+
+#undef DEF_NBD_READ
+
static inline bool nbd_reply_is_simple(NBDReply *reply)
{
return reply->magic == NBD_SIMPLE_REPLY_MAGIC;
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 813539676d..5c97052608 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -337,10 +337,9 @@ static int
nbd_co_receive_offset_data_payload(NBDClientSession *s,
return -EINVAL;
}
- if (nbd_read(s->ioc, &offset, sizeof(offset), errp) < 0) {
+ if (nbd_read64(s->ioc, &offset, "OFFSET_DATA offset", errp) < 0) {
return -EIO;
}
- be64_to_cpus(&offset);
data_size = chunk->length - sizeof(offset);
assert(data_size);
@@ -387,7 +386,7 @@ static coroutine_fn int nbd_co_receive_structured_payload(
}
*payload = g_new(char, len);
- ret = nbd_read(s->ioc, *payload, len, errp);
+ ret = nbd_read(s->ioc, *payload, len, "structured payload", errp);
if (ret < 0) {
g_free(*payload);
*payload = NULL;
diff --git a/nbd/client.c b/nbd/client.c
index 8a083c2f42..10a52ad7d0 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -113,8 +113,7 @@ static int nbd_receive_option_reply(QIOChannel *ioc,
uint32_t opt,
NBDOptionReply *reply, Error **errp)
{
QEMU_BUILD_BUG_ON(sizeof(*reply) != 20);
- if (nbd_read(ioc, reply, sizeof(*reply), errp) < 0) {
- error_prepend(errp, "failed to read option reply: ");
+ if (nbd_read(ioc, reply, sizeof(*reply), "option reply", errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
@@ -166,8 +165,8 @@ static int nbd_handle_reply_err(QIOChannel *ioc,
NBDOptionReply *reply,
goto cleanup;
}
msg = g_malloc(reply->length + 1);
- if (nbd_read(ioc, msg, reply->length, errp) < 0) {
- error_prepend(errp, "failed to read option error %" PRIu32
+ if (nbd_read(ioc, msg, reply->length, NULL, errp) < 0) {
+ error_prepend(errp, "Failed to read option error %" PRIu32
" (%s) message: ",
reply->type, nbd_rep_lookup(reply->type));
goto cleanup;
@@ -284,12 +283,10 @@ static int nbd_receive_list(QIOChannel *ioc, char **name,
char **description,
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &namelen, sizeof(namelen), errp) < 0) {
- error_prepend(errp, "failed to read option name length: ");
+ if (nbd_read32(ioc, &namelen, "option name length", errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
- namelen = be32_to_cpu(namelen);
len -= sizeof(namelen);
if (len < namelen) {
error_setg(errp, "incorrect option name length");
@@ -298,8 +295,7 @@ static int nbd_receive_list(QIOChannel *ioc, char **name,
char **description,
}
local_name = g_malloc(namelen + 1);
- if (nbd_read(ioc, local_name, namelen, errp) < 0) {
- error_prepend(errp, "failed to read export name: ");
+ if (nbd_read(ioc, local_name, namelen, "export name", errp) < 0) {
nbd_send_opt_abort(ioc);
goto out;
}
@@ -307,8 +303,7 @@ static int nbd_receive_list(QIOChannel *ioc, char **name,
char **description,
len -= namelen;
if (len) {
local_desc = g_malloc(len + 1);
- if (nbd_read(ioc, local_desc, len, errp) < 0) {
- error_prepend(errp, "failed to read export description: ");
+ if (nbd_read(ioc, local_desc, len, "export description", errp) < 0) {
nbd_send_opt_abort(ioc);
goto out;
}
@@ -410,13 +405,11 @@ static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t
opt,
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &type, sizeof(type), errp) < 0) {
- error_prepend(errp, "failed to read info type: ");
+ if (nbd_read16(ioc, &type, "info type", errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
len -= sizeof(type);
- type = be16_to_cpu(type);
switch (type) {
case NBD_INFO_EXPORT:
if (len != sizeof(info->size) + sizeof(info->flags)) {
@@ -425,18 +418,14 @@ static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t
opt,
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
- error_prepend(errp, "failed to read info size: ");
+ if (nbd_read64(ioc, &info->size, "info size", errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
- info->size = be64_to_cpu(info->size);
- if (nbd_read(ioc, &info->flags, sizeof(info->flags), errp) < 0) {
- error_prepend(errp, "failed to read info flags: ");
+ if (nbd_read16(ioc, &info->flags, "info flags", errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
- info->flags = be16_to_cpu(info->flags);
trace_nbd_receive_negotiate_size_flags(info->size, info->flags);
break;
@@ -447,27 +436,23 @@ static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t
opt,
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &info->min_block, sizeof(info->min_block),
- errp) < 0) {
- error_prepend(errp, "failed to read info minimum block size:
");
+ if (nbd_read32(ioc, &info->min_block, "info minimum block size",
+ errp) < 0) {
nbd_send_opt_abort(ioc);
return -1;
}
- info->min_block = be32_to_cpu(info->min_block);
if (!is_power_of_2(info->min_block)) {
error_setg(errp, "server minimum block size %" PRIu32
" is not a power of two", info->min_block);
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &info->opt_block, sizeof(info->opt_block),
- errp) < 0) {
- error_prepend(errp,
- "failed to read info preferred block size: ");
+ if (nbd_read32(ioc, &info->opt_block, "info preferred block size",
+ errp) < 0)
+ {
nbd_send_opt_abort(ioc);
return -1;
}
- info->opt_block = be32_to_cpu(info->opt_block);
if (!is_power_of_2(info->opt_block) ||
info->opt_block < info->min_block) {
error_setg(errp, "server preferred block size %" PRIu32
@@ -475,13 +460,12 @@ static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t
opt,
nbd_send_opt_abort(ioc);
return -1;
}
- if (nbd_read(ioc, &info->max_block, sizeof(info->max_block),
- errp) < 0) {
- error_prepend(errp, "failed to read info maximum block size:
");
+ if (nbd_read32(ioc, &info->max_block, "info maximum block size",
+ errp) < 0)
+ {
nbd_send_opt_abort(ioc);
return -1;
}
- info->max_block = be32_to_cpu(info->max_block);
if (info->max_block < info->min_block) {
error_setg(errp, "server maximum block size %" PRIu32
" is not valid", info->max_block);
@@ -731,14 +715,13 @@ static int nbd_receive_one_meta_context(QIOChannel *ioc,
return -1;
}
- if (nbd_read(ioc, &local_id, sizeof(local_id), errp) < 0) {
+ if (nbd_read32(ioc, &local_id, "context id", errp) < 0) {
return -1;
}
- local_id = be32_to_cpu(local_id);
reply.length -= sizeof(local_id);
local_name = g_malloc(reply.length + 1);
- if (nbd_read(ioc, local_name, reply.length, errp) < 0) {
+ if (nbd_read(ioc, local_name, reply.length, "context name", errp) < 0) {
g_free(local_name);
return -1;
}
@@ -896,11 +879,9 @@ static int nbd_start_negotiate(QIOChannel *ioc,
QCryptoTLSCreds *tlscreds,
return -EINVAL;
}
- if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
- error_prepend(errp, "Failed to read initial magic: ");
+ if (nbd_read64(ioc, &magic, "initial magic", errp) < 0) {
return -EINVAL;
}
- magic = be64_to_cpu(magic);
trace_nbd_receive_negotiate_magic(magic);
if (magic != NBD_INIT_MAGIC) {
@@ -908,11 +889,9 @@ static int nbd_start_negotiate(QIOChannel *ioc,
QCryptoTLSCreds *tlscreds,
return -EINVAL;
}
- if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
- error_prepend(errp, "Failed to read server magic: ");
+ if (nbd_read64(ioc, &magic, "server magic", errp) < 0) {
return -EINVAL;
}
- magic = be64_to_cpu(magic);
trace_nbd_receive_negotiate_magic(magic);
if (magic == NBD_OPTS_MAGIC) {
@@ -920,11 +899,9 @@ static int nbd_start_negotiate(QIOChannel *ioc,
QCryptoTLSCreds *tlscreds,
uint16_t globalflags;
bool fixedNewStyle = false;
- if (nbd_read(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
- error_prepend(errp, "Failed to read server flags: ");
+ if (nbd_read16(ioc, &globalflags, "server flags", errp) < 0) {
return -EINVAL;
}
- globalflags = be16_to_cpu(globalflags);
trace_nbd_receive_negotiate_server_flags(globalflags);
if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) {
fixedNewStyle = true;
@@ -992,17 +969,13 @@ static int nbd_negotiate_finish_oldstyle(QIOChannel *ioc,
NBDExportInfo *info,
{
uint32_t oldflags;
- if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
- error_prepend(errp, "Failed to read export length: ");
+ if (nbd_read64(ioc, &info->size, "export length", errp) < 0) {
return -EINVAL;
}
- info->size = be64_to_cpu(info->size);
- if (nbd_read(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
- error_prepend(errp, "Failed to read export flags: ");
+ if (nbd_read32(ioc, &oldflags, "export flags", errp) < 0) {
return -EINVAL;
}
- oldflags = be32_to_cpu(oldflags);
if (oldflags & ~0xffff) {
error_setg(errp, "Unexpected export flags %0x" PRIx32, oldflags);
return -EINVAL;
@@ -1079,17 +1052,13 @@ int nbd_receive_negotiate(QIOChannel *ioc,
QCryptoTLSCreds *tlscreds,
}
/* Read the response */
- if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
- error_prepend(errp, "Failed to read export length: ");
+ if (nbd_read64(ioc, &info->size, "export length", errp) < 0) {
return -EINVAL;
}
- info->size = be64_to_cpu(info->size);
- if (nbd_read(ioc, &info->flags, sizeof(info->flags), errp) < 0) {
- error_prepend(errp, "Failed to read export flags: ");
+ if (nbd_read16(ioc, &info->flags, "export flags", errp) < 0) {
return -EINVAL;
}
- info->flags = be16_to_cpu(info->flags);
break;
case 0: /* oldstyle, parse length and flags */
if (*info->name) {
@@ -1379,7 +1348,7 @@ static int nbd_receive_simple_reply(QIOChannel *ioc,
NBDSimpleReply *reply,
assert(reply->magic == NBD_SIMPLE_REPLY_MAGIC);
ret = nbd_read(ioc, (uint8_t *)reply + sizeof(reply->magic),
- sizeof(*reply) - sizeof(reply->magic), errp);
+ sizeof(*reply) - sizeof(reply->magic), "reply", errp);
if (ret < 0) {
return ret;
}
@@ -1404,7 +1373,8 @@ static int nbd_receive_structured_reply_chunk(QIOChannel
*ioc,
assert(chunk->magic == NBD_STRUCTURED_REPLY_MAGIC);
ret = nbd_read(ioc, (uint8_t *)chunk + sizeof(chunk->magic),
- sizeof(*chunk) - sizeof(chunk->magic), errp);
+ sizeof(*chunk) - sizeof(chunk->magic), "structured chunk",
+ errp);
if (ret < 0) {
return ret;
}
diff --git a/nbd/common.c b/nbd/common.c
index 41f5ed8d9f..cc8b278e54 100644
--- a/nbd/common.c
+++ b/nbd/common.c
@@ -31,7 +31,7 @@ int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
while (size > 0) {
ssize_t count = MIN(65536, size);
- ret = nbd_read(ioc, buffer, MIN(65536, size), errp);
+ ret = nbd_read(ioc, buffer, MIN(65536, size), NULL, errp);
if (ret < 0) {
goto cleanup;
diff --git a/nbd/server.c b/nbd/server.c
index cb0d5634fa..838c150d8c 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -438,8 +438,7 @@ static int nbd_negotiate_handle_export_name(NBDClient
*client,
error_setg(errp, "Bad length received");
return -EINVAL;
}
- if (nbd_read(client->ioc, name, client->optlen, errp) < 0) {
- error_prepend(errp, "read failed: ");
+ if (nbd_read(client->ioc, name, client->optlen, "export name", errp) < 0) {
return -EIO;
}
name[client->optlen] = '\0';
@@ -1046,11 +1045,9 @@ static int nbd_negotiate_options(NBDClient *client,
uint16_t myflags,
... Rest of request
*/
- if (nbd_read(client->ioc, &flags, sizeof(flags), errp) < 0) {
- error_prepend(errp, "read failed: ");
+ if (nbd_read32(client->ioc, &flags, "flags", errp) < 0) {
return -EIO;
}
- flags = be32_to_cpu(flags);
trace_nbd_negotiate_options_flags(flags);
if (flags & NBD_FLAG_C_FIXED_NEWSTYLE) {
fixedNewstyle = true;
@@ -1070,30 +1067,23 @@ static int nbd_negotiate_options(NBDClient *client,
uint16_t myflags,
uint32_t option, length;
uint64_t magic;
- if (nbd_read(client->ioc, &magic, sizeof(magic), errp) < 0) {
- error_prepend(errp, "read failed: ");
+ if (nbd_read64(client->ioc, &magic, "opts magic", errp) < 0) {
return -EINVAL;
}
- magic = be64_to_cpu(magic);
trace_nbd_negotiate_options_check_magic(magic);
if (magic != NBD_OPTS_MAGIC) {
error_setg(errp, "Bad magic received");
return -EINVAL;
}
- if (nbd_read(client->ioc, &option,
- sizeof(option), errp) < 0) {
- error_prepend(errp, "read failed: ");
+ if (nbd_read32(client->ioc, &option, "option", errp) < 0) {
return -EINVAL;
}
- option = be32_to_cpu(option);
client->opt = option;
- if (nbd_read(client->ioc, &length, sizeof(length), errp) < 0) {
- error_prepend(errp, "read failed: ");
+ if (nbd_read32(client->ioc, &length, "option length", errp) < 0) {
return -EINVAL;
}
- length = be32_to_cpu(length);
assert(!client->optlen);
client->optlen = length;
@@ -1306,7 +1296,7 @@ static int nbd_receive_request(QIOChannel *ioc,
NBDRequest *request,
uint32_t magic;
int ret;
- ret = nbd_read(ioc, buf, sizeof(buf), errp);
+ ret = nbd_read(ioc, buf, sizeof(buf), "request", errp);
if (ret < 0) {
return ret;
}
@@ -2111,8 +2101,9 @@ static int nbd_co_receive_request(NBDRequestData *req,
NBDRequest *request,
}
}
if (request->type == NBD_CMD_WRITE) {
- if (nbd_read(client->ioc, req->data, request->len, errp) < 0) {
- error_prepend(errp, "reading from socket failed: ");
+ if (nbd_read(client->ioc, req->data, request->len, "CMD_WRITE data",
+ errp) < 0)
+ {
return -EIO;
}
req->complete = true;
--
2.18.0
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Vladimir Sementsov-Ogievskiy <=