@@ -1116,8 +1116,9 @@ F: net/netmap.c
Network Block Device (NBD)
M: Paolo Bonzini <pbonzini@redhat.com>
S: Odd Fixes
-F: block/nbd.c
-F: nbd.*
+F: block/nbd*
+F: nbd/
+F: include/block/nbd*
F: qemu-nbd.c
T: git git://github.com/bonzini/qemu.git nbd-next
@@ -8,7 +8,8 @@ util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o
# block-obj-y is code used by both qemu system emulation and qemu-img
block-obj-y = async.o thread-pool.o
-block-obj-y += nbd.o block.o blockjob.o
+block-obj-y += nbd/
+block-obj-y += block.o blockjob.o
block-obj-y += main-loop.o iohandler.o qemu-timer.o
block-obj-$(CONFIG_POSIX) += aio-posix.o
block-obj-$(CONFIG_WIN32) += aio-win32.o
new file mode 100644
@@ -0,0 +1,113 @@
+/*
+ * NBD Internal Declarations
+ *
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef NBD_INTERNAL_H
+#define NBD_INTERNAL_H
+#include "block/nbd.h"
+#include "sysemu/block-backend.h"
+
+#include "qemu/coroutine.h"
+
+#include <errno.h>
+#include <string.h>
+#ifndef _WIN32
+#include <sys/ioctl.h>
+#endif
+#if defined(__sun__) || defined(__HAIKU__)
+#include <sys/ioccom.h>
+#endif
+#include <ctype.h>
+#include <inttypes.h>
+
+#ifdef __linux__
+#include <linux/fs.h>
+#endif
+
+#include "qemu/sockets.h"
+#include "qemu/queue.h"
+#include "qemu/main-loop.h"
+
+/* #define DEBUG_NBD */
+
+#ifdef DEBUG_NBD
+#define TRACE(msg, ...) do { \
+ LOG(msg, ## __VA_ARGS__); \
+} while(0)
+#else
+#define TRACE(msg, ...) \
+ do { } while (0)
+#endif
+
+#define LOG(msg, ...) do { \
+ fprintf(stderr, "%s:%s():L%d: " msg "\n", \
+ __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
+} while(0)
+
+/* This is all part of the "official" NBD API.
+ *
+ * The most up-to-date documentation is available at:
+ * https://github.com/yoe/nbd/blob/master/doc/proto.txt
+ */
+
+#define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4)
+#define NBD_REPLY_SIZE (4 + 4 + 8)
+#define NBD_REQUEST_MAGIC 0x25609513
+#define NBD_REPLY_MAGIC 0x67446698
+#define NBD_OPTS_MAGIC 0x49484156454F5054LL
+#define NBD_CLIENT_MAGIC 0x0000420281861253LL
+#define NBD_REP_MAGIC 0x3e889045565a9LL
+
+#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_OPT_EXPORT_NAME (1)
+#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 inline ssize_t read_sync(int fd, void *buffer, size_t size)
+{
+ /* Sockets are kept in blocking mode in the negotiation phase. After
+ * that, a non-readable socket simply means that another thread stole
+ * our request/reply. Synchronization is done with recv_coroutine, so
+ * that this is coroutine-safe.
+ */
+ return nbd_wr_sync(fd, buffer, size, true);
+}
+
+static inline ssize_t write_sync(int fd, void *buffer, size_t size)
+{
+ int ret;
+ do {
+ /* For writes, we do expect the socket to be writable. */
+ ret = nbd_wr_sync(fd, buffer, size, false);
+ } while (ret == -EAGAIN);
+ return ret;
+}
+
+#endif
new file mode 100644
@@ -0,0 +1 @@
+block-obj-y += server.o client.o common.o
new file mode 100644
@@ -0,0 +1,361 @@
+/*
+ * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
+ *
+ * Network Block Device Client Side
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "block/nbd-internal.h"
+
+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 */
+
+static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
+
+/* That's all folks */
+
+/* Basic flow for negotiation
+
+ Server Client
+ Negotiate
+
+ or
+
+ Server Client
+ Negotiate #1
+ Option
+ Negotiate #2
+
+ ----
+
+ followed by
+
+ Server Client
+ Request
+ Response
+ Request
+ Response
+ ...
+ ...
+ Request (type == 2)
+
+*/
+
+int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
+ off_t *size, Error **errp)
+{
+ char buf[256];
+ uint64_t magic, s;
+ uint16_t tmp;
+ int rc;
+
+ TRACE("Receiving negotiation.");
+
+ rc = -EINVAL;
+
+ if (read_sync(csock, buf, 8) != 8) {
+ error_setg(errp, "Failed to read data");
+ goto fail;
+ }
+
+ buf[8] = '\0';
+ if (strlen(buf) == 0) {
+ error_setg(errp, "Server connection closed unexpectedly");
+ goto fail;
+ }
+
+ TRACE("Magic is %c%c%c%c%c%c%c%c",
+ qemu_isprint(buf[0]) ? buf[0] : '.',
+ qemu_isprint(buf[1]) ? buf[1] : '.',
+ qemu_isprint(buf[2]) ? buf[2] : '.',
+ qemu_isprint(buf[3]) ? buf[3] : '.',
+ qemu_isprint(buf[4]) ? buf[4] : '.',
+ qemu_isprint(buf[5]) ? buf[5] : '.',
+ qemu_isprint(buf[6]) ? buf[6] : '.',
+ qemu_isprint(buf[7]) ? buf[7] : '.');
+
+ if (memcmp(buf, "NBDMAGIC", 8) != 0) {
+ error_setg(errp, "Invalid magic received");
+ goto fail;
+ }
+
+ if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ error_setg(errp, "Failed to read magic");
+ goto fail;
+ }
+ magic = be64_to_cpu(magic);
+ TRACE("Magic is 0x%" PRIx64, magic);
+
+ if (name) {
+ uint32_t reserved = 0;
+ uint32_t opt;
+ uint32_t namesize;
+
+ TRACE("Checking magic (opts_magic)");
+ if (magic != NBD_OPTS_MAGIC) {
+ if (magic == NBD_CLIENT_MAGIC) {
+ error_setg(errp, "Server does not support export names");
+ } else {
+ error_setg(errp, "Bad magic received");
+ }
+ goto fail;
+ }
+ if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+ error_setg(errp, "Failed to read server flags");
+ goto fail;
+ }
+ *flags = be16_to_cpu(tmp) << 16;
+ /* reserved for future use */
+ if (write_sync(csock, &reserved, sizeof(reserved)) !=
+ sizeof(reserved)) {
+ error_setg(errp, "Failed to read reserved field");
+ goto fail;
+ }
+ /* write the export name */
+ magic = cpu_to_be64(magic);
+ if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ error_setg(errp, "Failed to send export name magic");
+ goto fail;
+ }
+ opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
+ if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
+ error_setg(errp, "Failed to send export name option number");
+ goto fail;
+ }
+ namesize = cpu_to_be32(strlen(name));
+ if (write_sync(csock, &namesize, sizeof(namesize)) !=
+ sizeof(namesize)) {
+ error_setg(errp, "Failed to send export name length");
+ goto fail;
+ }
+ if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
+ error_setg(errp, "Failed to send export name");
+ goto fail;
+ }
+ } else {
+ TRACE("Checking magic (cli_magic)");
+
+ if (magic != NBD_CLIENT_MAGIC) {
+ if (magic == NBD_OPTS_MAGIC) {
+ error_setg(errp, "Server requires an export name");
+ } else {
+ error_setg(errp, "Bad magic received");
+ }
+ goto fail;
+ }
+ }
+
+ if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) {
+ error_setg(errp, "Failed to read export length");
+ goto fail;
+ }
+ *size = be64_to_cpu(s);
+ TRACE("Size is %" PRIu64, *size);
+
+ if (!name) {
+ if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
+ error_setg(errp, "Failed to read export flags");
+ goto fail;
+ }
+ *flags = be32_to_cpup(flags);
+ } else {
+ if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+ error_setg(errp, "Failed to read export flags");
+ goto fail;
+ }
+ *flags |= be16_to_cpu(tmp);
+ }
+ if (read_sync(csock, &buf, 124) != 124) {
+ error_setg(errp, "Failed to read reserved block");
+ goto fail;
+ }
+ rc = 0;
+
+fail:
+ return rc;
+}
+
+#ifdef __linux__
+int nbd_init(int fd, int csock, uint32_t flags, off_t size)
+{
+ TRACE("Setting NBD socket");
+
+ if (ioctl(fd, NBD_SET_SOCK, csock) < 0) {
+ int serrno = errno;
+ LOG("Failed to set NBD socket");
+ return -serrno;
+ }
+
+ TRACE("Setting block size to %lu", (unsigned long)BDRV_SECTOR_SIZE);
+
+ if (ioctl(fd, NBD_SET_BLKSIZE, (size_t)BDRV_SECTOR_SIZE) < 0) {
+ int serrno = errno;
+ LOG("Failed setting NBD block size");
+ return -serrno;
+ }
+
+ TRACE("Setting size to %zd block(s)", (size_t)(size / BDRV_SECTOR_SIZE));
+
+ if (ioctl(fd, NBD_SET_SIZE_BLOCKS, (size_t)(size / BDRV_SECTOR_SIZE)) < 0) {
+ int serrno = errno;
+ LOG("Failed setting size (in blocks)");
+ return -serrno;
+ }
+
+ if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) {
+ if (errno == ENOTTY) {
+ int read_only = (flags & NBD_FLAG_READ_ONLY) != 0;
+ TRACE("Setting readonly attribute");
+
+ if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
+ int serrno = errno;
+ LOG("Failed setting read-only attribute");
+ return -serrno;
+ }
+ } else {
+ int serrno = errno;
+ LOG("Failed setting flags");
+ return -serrno;
+ }
+ }
+
+ TRACE("Negotiation ended");
+
+ return 0;
+}
+
+int nbd_client(int fd)
+{
+ int ret;
+ int serrno;
+
+ TRACE("Doing NBD loop");
+
+ ret = ioctl(fd, NBD_DO_IT);
+ if (ret < 0 && errno == EPIPE) {
+ /* NBD_DO_IT normally returns EPIPE when someone has disconnected
+ * the socket via NBD_DISCONNECT. We do not want to return 1 in
+ * that case.
+ */
+ ret = 0;
+ }
+ serrno = errno;
+
+ TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
+
+ TRACE("Clearing NBD queue");
+ ioctl(fd, NBD_CLEAR_QUE);
+
+ TRACE("Clearing NBD socket");
+ ioctl(fd, NBD_CLEAR_SOCK);
+
+ errno = serrno;
+ return ret;
+}
+#else
+int nbd_init(int fd, int csock, uint32_t flags, off_t size)
+{
+ return -ENOTSUP;
+}
+
+int nbd_client(int fd)
+{
+ return -ENOTSUP;
+}
+#endif
+
+ssize_t nbd_send_request(int csock, struct nbd_request *request)
+{
+ uint8_t buf[NBD_REQUEST_SIZE];
+ ssize_t ret;
+
+ cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
+ cpu_to_be32w((uint32_t*)(buf + 4), request->type);
+ cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
+ cpu_to_be64w((uint64_t*)(buf + 16), request->from);
+ cpu_to_be32w((uint32_t*)(buf + 24), request->len);
+
+ TRACE("Sending request to client: "
+ "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
+ request->from, request->len, request->handle, request->type);
+
+ ret = write_sync(csock, buf, sizeof(buf));
+ if (ret < 0) {
+ return ret;
+ }
+
+ if (ret != sizeof(buf)) {
+ LOG("writing to socket failed");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply)
+{
+ uint8_t buf[NBD_REPLY_SIZE];
+ uint32_t magic;
+ ssize_t ret;
+
+ ret = read_sync(csock, buf, sizeof(buf));
+ if (ret < 0) {
+ return ret;
+ }
+
+ if (ret != sizeof(buf)) {
+ LOG("read failed");
+ return -EINVAL;
+ }
+
+ /* Reply
+ [ 0 .. 3] magic (NBD_REPLY_MAGIC)
+ [ 4 .. 7] error (0 == no error)
+ [ 7 .. 15] handle
+ */
+
+ magic = be32_to_cpup((uint32_t*)buf);
+ 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);
+
+ if (magic != NBD_REPLY_MAGIC) {
+ LOG("invalid magic (got 0x%x)", magic);
+ return -EINVAL;
+ }
+ return 0;
+}
+
new file mode 100644
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
+ *
+ * Network Block Device Common Code
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "block/nbd-internal.h"
+
+ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
+{
+ size_t offset = 0;
+ int err;
+
+ if (qemu_in_coroutine()) {
+ if (do_read) {
+ return qemu_co_recv(fd, buffer, size);
+ } else {
+ return qemu_co_send(fd, buffer, size);
+ }
+ }
+
+ while (offset < size) {
+ ssize_t len;
+
+ if (do_read) {
+ len = qemu_recv(fd, buffer + offset, size - offset, 0);
+ } else {
+ len = send(fd, buffer + offset, size - offset, 0);
+ }
+
+ if (len < 0) {
+ err = socket_error();
+
+ /* recoverable error */
+ if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) {
+ continue;
+ }
+
+ /* unrecoverable error */
+ return -err;
+ }
+
+ /* eof */
+ if (len == 0) {
+ break;
+ }
+
+ offset += len;
+ }
+
+ return offset;
+}
similarity index 68%
rename from nbd.c
rename to nbd/server.c
@@ -1,7 +1,7 @@
/*
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
*
- * Network Block Device
+ * Network Block Device Server Side
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -16,86 +16,7 @@
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
-#include "block/nbd.h"
-#include "sysemu/block-backend.h"
-
-#include "qemu/coroutine.h"
-
-#include <errno.h>
-#include <string.h>
-#ifndef _WIN32
-#include <sys/ioctl.h>
-#endif
-#if defined(__sun__) || defined(__HAIKU__)
-#include <sys/ioccom.h>
-#endif
-#include <ctype.h>
-#include <inttypes.h>
-
-#ifdef __linux__
-#include <linux/fs.h>
-#endif
-
-#include "qemu/sockets.h"
-#include "qemu/queue.h"
-#include "qemu/main-loop.h"
-
-//#define DEBUG_NBD
-
-#ifdef DEBUG_NBD
-#define TRACE(msg, ...) do { \
- LOG(msg, ## __VA_ARGS__); \
-} while(0)
-#else
-#define TRACE(msg, ...) \
- do { } while (0)
-#endif
-
-#define LOG(msg, ...) do { \
- fprintf(stderr, "%s:%s():L%d: " msg "\n", \
- __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
-} while(0)
-
-/* This is all part of the "official" NBD API.
- *
- * The most up-to-date documentation is available at:
- * https://github.com/yoe/nbd/blob/master/doc/proto.txt
- */
-
-#define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4)
-#define NBD_REPLY_SIZE (4 + 4 + 8)
-#define NBD_REQUEST_MAGIC 0x25609513
-#define NBD_REPLY_MAGIC 0x67446698
-#define NBD_OPTS_MAGIC 0x49484156454F5054LL
-#define NBD_CLIENT_MAGIC 0x0000420281861253LL
-#define NBD_REP_MAGIC 0x3e889045565a9LL
-
-#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_OPT_EXPORT_NAME (1)
-#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
+#include "block/nbd-internal.h"
static int system_errno_to_nbd_errno(int err)
{
@@ -120,25 +41,6 @@ static int system_errno_to_nbd_errno(int err)
}
}
-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;
@@ -191,61 +93,6 @@ static void nbd_set_handlers(NBDClient *client);
static void nbd_unset_handlers(NBDClient *client);
static void nbd_update_can_read(NBDClient *client);
-ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
-{
- size_t offset = 0;
- int err;
-
- if (qemu_in_coroutine()) {
- if (do_read) {
- return qemu_co_recv(fd, buffer, size);
- } else {
- return qemu_co_send(fd, buffer, size);
- }
- }
-
- while (offset < size) {
- ssize_t len;
-
- if (do_read) {
- len = qemu_recv(fd, buffer + offset, size - offset, 0);
- } else {
- len = send(fd, buffer + offset, size - offset, 0);
- }
-
- if (len < 0) {
- err = socket_error();
-
- /* recoverable error */
- if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) {
- continue;
- }
-
- /* unrecoverable error */
- return -err;
- }
-
- /* eof */
- if (len == 0) {
- break;
- }
-
- offset += len;
- }
-
- return offset;
-}
-
-static ssize_t read_sync(int fd, void *buffer, size_t size)
-{
- /* Sockets are kept in blocking mode in the negotiation phase. After
- * that, a non-readable socket simply means that another thread stole
- * our request/reply. Synchronization is done with recv_coroutine, so
- * that this is coroutine-safe.
- */
- return nbd_wr_sync(fd, buffer, size, true);
-}
-
static ssize_t drop_sync(int fd, size_t size)
{
ssize_t ret, dropped = size;
@@ -266,16 +113,6 @@ static ssize_t drop_sync(int fd, size_t size)
return dropped;
}
-static ssize_t write_sync(int fd, void *buffer, size_t size)
-{
- int ret;
- do {
- /* For writes, we do expect the socket to be writable. */
- ret = nbd_wr_sync(fd, buffer, size, false);
- } while (ret == -EAGAIN);
- return ret;
-}
-
/* Basic flow for negotiation
Server Client
@@ -579,188 +416,7 @@ fail:
return rc;
}
-int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
- off_t *size, Error **errp)
-{
- char buf[256];
- uint64_t magic, s;
- uint16_t tmp;
- int rc;
-
- TRACE("Receiving negotiation.");
-
- rc = -EINVAL;
-
- if (read_sync(csock, buf, 8) != 8) {
- error_setg(errp, "Failed to read data");
- goto fail;
- }
-
- buf[8] = '\0';
- if (strlen(buf) == 0) {
- error_setg(errp, "Server connection closed unexpectedly");
- goto fail;
- }
-
- TRACE("Magic is %c%c%c%c%c%c%c%c",
- qemu_isprint(buf[0]) ? buf[0] : '.',
- qemu_isprint(buf[1]) ? buf[1] : '.',
- qemu_isprint(buf[2]) ? buf[2] : '.',
- qemu_isprint(buf[3]) ? buf[3] : '.',
- qemu_isprint(buf[4]) ? buf[4] : '.',
- qemu_isprint(buf[5]) ? buf[5] : '.',
- qemu_isprint(buf[6]) ? buf[6] : '.',
- qemu_isprint(buf[7]) ? buf[7] : '.');
-
- if (memcmp(buf, "NBDMAGIC", 8) != 0) {
- error_setg(errp, "Invalid magic received");
- goto fail;
- }
-
- if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
- error_setg(errp, "Failed to read magic");
- goto fail;
- }
- magic = be64_to_cpu(magic);
- TRACE("Magic is 0x%" PRIx64, magic);
-
- if (name) {
- uint32_t reserved = 0;
- uint32_t opt;
- uint32_t namesize;
-
- TRACE("Checking magic (opts_magic)");
- if (magic != NBD_OPTS_MAGIC) {
- if (magic == NBD_CLIENT_MAGIC) {
- error_setg(errp, "Server does not support export names");
- } else {
- error_setg(errp, "Bad magic received");
- }
- goto fail;
- }
- if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
- error_setg(errp, "Failed to read server flags");
- goto fail;
- }
- *flags = be16_to_cpu(tmp) << 16;
- /* reserved for future use */
- if (write_sync(csock, &reserved, sizeof(reserved)) !=
- sizeof(reserved)) {
- error_setg(errp, "Failed to read reserved field");
- goto fail;
- }
- /* write the export name */
- magic = cpu_to_be64(magic);
- if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
- error_setg(errp, "Failed to send export name magic");
- goto fail;
- }
- opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
- if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
- error_setg(errp, "Failed to send export name option number");
- goto fail;
- }
- namesize = cpu_to_be32(strlen(name));
- if (write_sync(csock, &namesize, sizeof(namesize)) !=
- sizeof(namesize)) {
- error_setg(errp, "Failed to send export name length");
- goto fail;
- }
- if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
- error_setg(errp, "Failed to send export name");
- goto fail;
- }
- } else {
- TRACE("Checking magic (cli_magic)");
-
- if (magic != NBD_CLIENT_MAGIC) {
- if (magic == NBD_OPTS_MAGIC) {
- error_setg(errp, "Server requires an export name");
- } else {
- error_setg(errp, "Bad magic received");
- }
- goto fail;
- }
- }
-
- if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) {
- error_setg(errp, "Failed to read export length");
- goto fail;
- }
- *size = be64_to_cpu(s);
- TRACE("Size is %" PRIu64, *size);
-
- if (!name) {
- if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
- error_setg(errp, "Failed to read export flags");
- goto fail;
- }
- *flags = be32_to_cpup(flags);
- } else {
- if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
- error_setg(errp, "Failed to read export flags");
- goto fail;
- }
- *flags |= be16_to_cpu(tmp);
- }
- if (read_sync(csock, &buf, 124) != 124) {
- error_setg(errp, "Failed to read reserved block");
- goto fail;
- }
- rc = 0;
-
-fail:
- return rc;
-}
-
#ifdef __linux__
-int nbd_init(int fd, int csock, uint32_t flags, off_t size)
-{
- TRACE("Setting NBD socket");
-
- if (ioctl(fd, NBD_SET_SOCK, csock) < 0) {
- int serrno = errno;
- LOG("Failed to set NBD socket");
- return -serrno;
- }
-
- TRACE("Setting block size to %lu", (unsigned long)BDRV_SECTOR_SIZE);
-
- if (ioctl(fd, NBD_SET_BLKSIZE, (size_t)BDRV_SECTOR_SIZE) < 0) {
- int serrno = errno;
- LOG("Failed setting NBD block size");
- return -serrno;
- }
-
- TRACE("Setting size to %zd block(s)", (size_t)(size / BDRV_SECTOR_SIZE));
-
- if (ioctl(fd, NBD_SET_SIZE_BLOCKS, (size_t)(size / BDRV_SECTOR_SIZE)) < 0) {
- int serrno = errno;
- LOG("Failed setting size (in blocks)");
- return -serrno;
- }
-
- if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) {
- if (errno == ENOTTY) {
- int read_only = (flags & NBD_FLAG_READ_ONLY) != 0;
- TRACE("Setting readonly attribute");
-
- if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
- int serrno = errno;
- LOG("Failed setting read-only attribute");
- return -serrno;
- }
- } else {
- int serrno = errno;
- LOG("Failed setting flags");
- return -serrno;
- }
- }
-
- TRACE("Negotiation ended");
-
- return 0;
-}
int nbd_disconnect(int fd)
{
@@ -770,78 +426,14 @@ int nbd_disconnect(int fd)
return 0;
}
-int nbd_client(int fd)
-{
- int ret;
- int serrno;
-
- TRACE("Doing NBD loop");
-
- ret = ioctl(fd, NBD_DO_IT);
- if (ret < 0 && errno == EPIPE) {
- /* NBD_DO_IT normally returns EPIPE when someone has disconnected
- * the socket via NBD_DISCONNECT. We do not want to return 1 in
- * that case.
- */
- ret = 0;
- }
- serrno = errno;
-
- TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
-
- TRACE("Clearing NBD queue");
- ioctl(fd, NBD_CLEAR_QUE);
-
- TRACE("Clearing NBD socket");
- ioctl(fd, NBD_CLEAR_SOCK);
-
- errno = serrno;
- return ret;
-}
#else
-int nbd_init(int fd, int csock, uint32_t flags, off_t size)
-{
- return -ENOTSUP;
-}
int nbd_disconnect(int fd)
{
return -ENOTSUP;
}
-
-int nbd_client(int fd)
-{
- return -ENOTSUP;
-}
#endif
-ssize_t nbd_send_request(int csock, struct nbd_request *request)
-{
- uint8_t buf[NBD_REQUEST_SIZE];
- ssize_t ret;
-
- cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
- cpu_to_be32w((uint32_t*)(buf + 4), request->type);
- cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
- cpu_to_be64w((uint64_t*)(buf + 16), request->from);
- cpu_to_be32w((uint32_t*)(buf + 24), request->len);
-
- TRACE("Sending request to client: "
- "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
- request->from, request->len, request->handle, request->type);
-
- ret = write_sync(csock, buf, sizeof(buf));
- if (ret < 0) {
- return ret;
- }
-
- if (ret != sizeof(buf)) {
- LOG("writing to socket failed");
- return -EINVAL;
- }
- return 0;
-}
-
static ssize_t nbd_receive_request(int csock, struct nbd_request *request)
{
uint8_t buf[NBD_REQUEST_SIZE];
@@ -883,45 +475,6 @@ static ssize_t nbd_receive_request(int csock, struct nbd_request *request)
return 0;
}
-ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply)
-{
- uint8_t buf[NBD_REPLY_SIZE];
- uint32_t magic;
- ssize_t ret;
-
- ret = read_sync(csock, buf, sizeof(buf));
- if (ret < 0) {
- return ret;
- }
-
- if (ret != sizeof(buf)) {
- LOG("read failed");
- return -EINVAL;
- }
-
- /* Reply
- [ 0 .. 3] magic (NBD_REPLY_MAGIC)
- [ 4 .. 7] error (0 == no error)
- [ 7 .. 15] handle
- */
-
- magic = be32_to_cpup((uint32_t*)buf);
- 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);
-
- if (magic != NBD_REPLY_MAGIC) {
- LOG("invalid magic (got 0x%x)", magic);
- return -EINVAL;
- }
- return 0;
-}
-
static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply)
{
uint8_t buf[NBD_REPLY_SIZE];
@@ -55,7 +55,7 @@ filter_nbd() {
# callbacks sometimes, making them unreliable.
#
# Filter out the TCP port number since this changes between runs.
- sed -e 's#^.*nbd\.c:.*##g' \
+ sed -e 's#^.*nbd/.*\.c:.*##g' \
-e 's#nbd:127\.0\.0\.1:[^:]*:#nbd:127\.0\.0\.1:PORT:#g' \
-e 's#\(exportname=foo\|PORT\): Failed to .*$#\1#'
}
We have NBD server code and client code, all mixed in a file. Now split them into separate files under nbd/, and update MAINTAINERS. filter_nbd for iotest 083 is updated to keep the log filtered out. Signed-off-by: Fam Zheng <famz@redhat.com> --- MAINTAINERS | 5 +- Makefile.objs | 3 +- include/block/nbd-internal.h | 113 +++++++++++ nbd/Makefile.objs | 1 + nbd/client.c | 361 ++++++++++++++++++++++++++++++++++ nbd/common.c | 64 ++++++ nbd.c => nbd/server.c | 451 +------------------------------------------ tests/qemu-iotests/083 | 2 +- 8 files changed, 547 insertions(+), 453 deletions(-) create mode 100644 include/block/nbd-internal.h create mode 100644 nbd/Makefile.objs create mode 100644 nbd/client.c create mode 100644 nbd/common.c rename nbd.c => nbd/server.c (68%)