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-rw-r--r--dev-tools/qemuDebuggingPatch/nbd.c1504
-rw-r--r--dev-tools/qemuDebuggingPatch/qemu-nbd.c812
-rw-r--r--dev-tools/virtualBoxTFTPRoot/pxelinux.cfg/default2
3 files changed, 2317 insertions, 1 deletions
diff --git a/dev-tools/qemuDebuggingPatch/nbd.c b/dev-tools/qemuDebuggingPatch/nbd.c
new file mode 100644
index 00000000..f8977e96
--- /dev/null
+++ b/dev-tools/qemuDebuggingPatch/nbd.c
@@ -0,0 +1,1504 @@
+/*
+ * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
+ *
+ * Network Block Device
+ *
+ * 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.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 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;
+
+struct NBDRequest {
+ QSIMPLEQ_ENTRY(NBDRequest) entry;
+ NBDClient *client;
+ uint8_t *data;
+};
+
+struct NBDExport {
+ int refcount;
+ void (*close)(NBDExport *exp);
+
+ BlockBackend *blk;
+ char *name;
+ off_t dev_offset;
+ off_t size;
+ uint32_t nbdflags;
+ QTAILQ_HEAD(, NBDClient) clients;
+ QTAILQ_ENTRY(NBDExport) next;
+
+ AioContext *ctx;
+};
+
+static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
+
+struct NBDClient {
+ int refcount;
+ void (*close)(NBDClient *client);
+
+ NBDExport *exp;
+ int sock;
+
+ Coroutine *recv_coroutine;
+
+ CoMutex send_lock;
+ Coroutine *send_coroutine;
+
+ bool can_read;
+
+ QTAILQ_ENTRY(NBDClient) next;
+ int nb_requests;
+ bool closing;
+};
+
+/* That's all folks */
+
+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;
+ uint8_t *buffer = g_malloc(MIN(65536, size));
+
+ while (size > 0) {
+ ret = read_sync(fd, buffer, MIN(65536, size));
+ if (ret < 0) {
+ g_free(buffer);
+ return ret;
+ }
+
+ assert(ret <= size);
+ size -= ret;
+ }
+
+ g_free(buffer);
+ 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
+ Negotiate
+
+ or
+
+ Server Client
+ Negotiate #1
+ Option
+ Negotiate #2
+
+ ----
+
+ followed by
+
+ Server Client
+ Request
+ Response
+ Request
+ Response
+ ...
+ ...
+ Request (type == 2)
+
+*/
+
+static int nbd_send_rep(int csock, uint32_t type, uint32_t opt)
+{
+ uint64_t magic;
+ uint32_t len;
+
+ magic = cpu_to_be64(NBD_REP_MAGIC);
+ if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ LOG("write failed (rep magic)");
+ return -EINVAL;
+ }
+ opt = cpu_to_be32(opt);
+ if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
+ LOG("write failed (rep opt)");
+ return -EINVAL;
+ }
+ type = cpu_to_be32(type);
+ if (write_sync(csock, &type, sizeof(type)) != sizeof(type)) {
+ LOG("write failed (rep type)");
+ return -EINVAL;
+ }
+ len = cpu_to_be32(0);
+ if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) {
+ LOG("write failed (rep data length)");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int nbd_send_rep_list(int csock, NBDExport *exp)
+{
+ uint64_t magic, name_len;
+ uint32_t opt, type, len;
+
+ name_len = strlen(exp->name);
+ magic = cpu_to_be64(NBD_REP_MAGIC);
+ if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ LOG("write failed (magic)");
+ return -EINVAL;
+ }
+ opt = cpu_to_be32(NBD_OPT_LIST);
+ if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
+ LOG("write failed (opt)");
+ return -EINVAL;
+ }
+ type = cpu_to_be32(NBD_REP_SERVER);
+ if (write_sync(csock, &type, sizeof(type)) != sizeof(type)) {
+ LOG("write failed (reply type)");
+ return -EINVAL;
+ }
+ len = cpu_to_be32(name_len + sizeof(len));
+ if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) {
+ LOG("write failed (length)");
+ return -EINVAL;
+ }
+ len = cpu_to_be32(name_len);
+ if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) {
+ LOG("write failed (length)");
+ return -EINVAL;
+ }
+ if (write_sync(csock, exp->name, name_len) != name_len) {
+ LOG("write failed (buffer)");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int nbd_handle_list(NBDClient *client, uint32_t length)
+{
+ int csock;
+ NBDExport *exp;
+
+ csock = client->sock;
+ if (length) {
+ if (drop_sync(csock, length) != length) {
+ return -EIO;
+ }
+ return nbd_send_rep(csock, NBD_REP_ERR_INVALID, NBD_OPT_LIST);
+ }
+
+ /* For each export, send a NBD_REP_SERVER reply. */
+ QTAILQ_FOREACH(exp, &exports, next) {
+ if (nbd_send_rep_list(csock, exp)) {
+ return -EINVAL;
+ }
+ }
+ /* Finish with a NBD_REP_ACK. */
+ return nbd_send_rep(csock, NBD_REP_ACK, NBD_OPT_LIST);
+}
+
+static int nbd_handle_export_name(NBDClient *client, uint32_t length)
+{
+ int rc = -EINVAL, csock = client->sock;
+ char name[256];
+
+ /* Client sends:
+ [20 .. xx] export name (length bytes)
+ */
+ TRACE("Checking length");
+ if (length > 255) {
+ LOG("Bad length received");
+ goto fail;
+ }
+ if (read_sync(csock, name, length) != length) {
+ LOG("read failed");
+ goto fail;
+ }
+ name[length] = '\0';
+
+ client->exp = nbd_export_find(name);
+ if (!client->exp) {
+ LOG("export not found");
+ goto fail;
+ }
+
+ QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
+ nbd_export_get(client->exp);
+ rc = 0;
+fail:
+ return rc;
+}
+
+static int nbd_receive_options(NBDClient *client)
+{
+ int csock = client->sock;
+ uint32_t flags;
+
+ /* Client sends:
+ [ 0 .. 3] client flags
+
+ [ 0 .. 7] NBD_OPTS_MAGIC
+ [ 8 .. 11] NBD option
+ [12 .. 15] Data length
+ ... Rest of request
+
+ [ 0 .. 7] NBD_OPTS_MAGIC
+ [ 8 .. 11] Second NBD option
+ [12 .. 15] Data length
+ ... Rest of request
+ */
+
+ if (read_sync(csock, &flags, sizeof(flags)) != sizeof(flags)) {
+ LOG("read failed");
+ return -EIO;
+ }
+ TRACE("Checking client flags");
+ be32_to_cpus(&flags);
+ if (flags != 0 && flags != NBD_FLAG_C_FIXED_NEWSTYLE) {
+ LOG("Bad client flags received");
+ return -EIO;
+ }
+
+ while (1) {
+ int ret;
+ uint32_t tmp, length;
+ uint64_t magic;
+
+ if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ LOG("read failed");
+ return -EINVAL;
+ }
+ TRACE("Checking opts magic");
+ if (magic != be64_to_cpu(NBD_OPTS_MAGIC)) {
+ LOG("Bad magic received");
+ return -EINVAL;
+ }
+
+ if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+ LOG("read failed");
+ return -EINVAL;
+ }
+
+ if (read_sync(csock, &length, sizeof(length)) != sizeof(length)) {
+ LOG("read failed");
+ return -EINVAL;
+ }
+ length = be32_to_cpu(length);
+
+ TRACE("Checking option");
+ switch (be32_to_cpu(tmp)) {
+ case NBD_OPT_LIST:
+ ret = nbd_handle_list(client, length);
+ if (ret < 0) {
+ return ret;
+ }
+ break;
+
+ case NBD_OPT_ABORT:
+ return -EINVAL;
+
+ case NBD_OPT_EXPORT_NAME:
+ return nbd_handle_export_name(client, length);
+
+ default:
+ tmp = be32_to_cpu(tmp);
+ LOG("Unsupported option 0x%x", tmp);
+ nbd_send_rep(client->sock, NBD_REP_ERR_UNSUP, tmp);
+ return -EINVAL;
+ }
+ }
+}
+
+static int nbd_send_negotiate(NBDClient *client)
+{
+ int csock = client->sock;
+ char buf[8 + 8 + 8 + 128];
+ int rc;
+ const int myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM |
+ NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA);
+
+ /* Negotiation header without options:
+ [ 0 .. 7] passwd ("NBDMAGIC")
+ [ 8 .. 15] magic (NBD_CLIENT_MAGIC)
+ [16 .. 23] size
+ [24 .. 25] server flags (0)
+ [26 .. 27] export flags
+ [28 .. 151] reserved (0)
+
+ Negotiation header with options, part 1:
+ [ 0 .. 7] passwd ("NBDMAGIC")
+ [ 8 .. 15] magic (NBD_OPTS_MAGIC)
+ [16 .. 17] server flags (0)
+
+ part 2 (after options are sent):
+ [18 .. 25] size
+ [26 .. 27] export flags
+ [28 .. 151] reserved (0)
+ */
+
+ qemu_set_block(csock);
+ rc = -EINVAL;
+
+ TRACE("Beginning negotiation.");
+ memset(buf, 0, sizeof(buf));
+ memcpy(buf, "NBDMAGIC", 8);
+ if (client->exp) {
+ assert ((client->exp->nbdflags & ~65535) == 0);
+ cpu_to_be64w((uint64_t*)(buf + 8), NBD_CLIENT_MAGIC);
+ cpu_to_be64w((uint64_t*)(buf + 16), client->exp->size);
+ cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags);
+ } else {
+ cpu_to_be64w((uint64_t*)(buf + 8), NBD_OPTS_MAGIC);
+ cpu_to_be16w((uint16_t *)(buf + 16), NBD_FLAG_FIXED_NEWSTYLE);
+ }
+
+ if (client->exp) {
+ if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
+ LOG("write failed");
+ goto fail;
+ }
+ } else {
+ if (write_sync(csock, buf, 18) != 18) {
+ LOG("write failed");
+ goto fail;
+ }
+ rc = nbd_receive_options(client);
+ if (rc != 0) {
+ LOG("option negotiation failed");
+ goto fail;
+ }
+
+ assert ((client->exp->nbdflags & ~65535) == 0);
+ cpu_to_be64w((uint64_t*)(buf + 18), client->exp->size);
+ cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags);
+ if (write_sync(csock, buf + 18, sizeof(buf) - 18) != sizeof(buf) - 18) {
+ LOG("write failed");
+ goto fail;
+ }
+ }
+
+ TRACE("Negotiation succeeded.");
+ rc = 0;
+fail:
+ qemu_set_nonblock(csock);
+ 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)
+{
+ ioctl(fd, NBD_CLEAR_QUE);
+ ioctl(fd, NBD_DISCONNECT);
+ ioctl(fd, NBD_CLEAR_SOCK);
+ return 0;
+}
+
+int nbd_client(int fd)
+{
+ int ret;
+ int serrno;
+
+ TRACE("Doing NBD loop");
+
+ fprintf(stderr, "------------------------\nJAU: nbd_client -> ioctl started PID: %d\n-------------------\n", getpid());
+ ret = ioctl(fd, NBD_DO_IT);
+ fprintf(stderr, "------------------------\nJAU: nbd_client -> ioctl returned %d PID: %d\n-------------------\n", ret, getpid());
+ 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;
+ fprintf(stderr, "------------------------\nJAU: nbd_client -> serrno is %s PID: %d\n-------------------\n", strerror(serrno), getpid());
+
+ 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;
+ fprintf(stderr, "------------------------\nJAU: nbd_client nbd queue and socket cleared PID: %d\n-------------------\n", getpid());
+ 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];
+ 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;
+ }
+
+ /* Request
+ [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
+ [ 4 .. 7] type (0 == READ, 1 == WRITE)
+ [ 8 .. 15] handle
+ [16 .. 23] from
+ [24 .. 27] len
+ */
+
+ magic = be32_to_cpup((uint32_t*)buf);
+ request->type = be32_to_cpup((uint32_t*)(buf + 4));
+ request->handle = be64_to_cpup((uint64_t*)(buf + 8));
+ request->from = be64_to_cpup((uint64_t*)(buf + 16));
+ request->len = be32_to_cpup((uint32_t*)(buf + 24));
+
+ TRACE("Got request: "
+ "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }",
+ magic, request->type, request->from, request->len);
+
+ if (magic != NBD_REQUEST_MAGIC) {
+ LOG("invalid magic (got 0x%x)", magic);
+ 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;
+}
+
+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)
+ [ 7 .. 15] handle
+ */
+ cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC);
+ cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
+ cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
+
+ TRACE("Sending response to client");
+
+ 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;
+}
+
+#define MAX_NBD_REQUESTS 16
+
+void nbd_client_get(NBDClient *client)
+{
+ client->refcount++;
+}
+
+void nbd_client_put(NBDClient *client)
+{
+ if (--client->refcount == 0) {
+ /* The last reference should be dropped by client->close,
+ * which is called by client_close.
+ */
+ assert(client->closing);
+
+ nbd_unset_handlers(client);
+ close(client->sock);
+ client->sock = -1;
+ if (client->exp) {
+ QTAILQ_REMOVE(&client->exp->clients, client, next);
+ nbd_export_put(client->exp);
+ }
+ g_free(client);
+ }
+}
+
+static void client_close(NBDClient *client)
+{
+ if (client->closing) {
+ return;
+ }
+
+ client->closing = true;
+
+ /* Force requests to finish. They will drop their own references,
+ * then we'll close the socket and free the NBDClient.
+ */
+ shutdown(client->sock, 2);
+
+ /* Also tell the client, so that they release their reference. */
+ if (client->close) {
+ client->close(client);
+ }
+}
+
+static NBDRequest *nbd_request_get(NBDClient *client)
+{
+ NBDRequest *req;
+
+ assert(client->nb_requests <= MAX_NBD_REQUESTS - 1);
+ client->nb_requests++;
+ nbd_update_can_read(client);
+
+ req = g_new0(NBDRequest, 1);
+ nbd_client_get(client);
+ req->client = client;
+ return req;
+}
+
+static void nbd_request_put(NBDRequest *req)
+{
+ NBDClient *client = req->client;
+
+ if (req->data) {
+ qemu_vfree(req->data);
+ }
+ g_free(req);
+
+ client->nb_requests--;
+ nbd_update_can_read(client);
+ nbd_client_put(client);
+}
+
+static void blk_aio_attached(AioContext *ctx, void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
+
+ TRACE("Export %s: Attaching clients to AIO context %p\n", exp->name, ctx);
+
+ exp->ctx = ctx;
+
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ nbd_set_handlers(client);
+ }
+}
+
+static void blk_aio_detach(void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
+
+ TRACE("Export %s: Detaching clients from AIO context %p\n", exp->name, exp->ctx);
+
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ nbd_unset_handlers(client);
+ }
+
+ exp->ctx = NULL;
+}
+
+NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size,
+ uint32_t nbdflags, void (*close)(NBDExport *),
+ Error **errp)
+{
+ NBDExport *exp = g_malloc0(sizeof(NBDExport));
+ exp->refcount = 1;
+ QTAILQ_INIT(&exp->clients);
+ exp->blk = blk;
+ exp->dev_offset = dev_offset;
+ exp->nbdflags = nbdflags;
+ exp->size = size < 0 ? blk_getlength(blk) : size;
+ if (exp->size < 0) {
+ error_setg_errno(errp, -exp->size,
+ "Failed to determine the NBD export's length");
+ goto fail;
+ }
+ exp->size -= exp->size % BDRV_SECTOR_SIZE;
+
+ exp->close = close;
+ exp->ctx = blk_get_aio_context(blk);
+ blk_ref(blk);
+ blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp);
+ /*
+ * NBD exports are used for non-shared storage migration. Make sure
+ * that BDRV_O_INCOMING is cleared and the image is ready for write
+ * access since the export could be available before migration handover.
+ */
+ blk_invalidate_cache(blk, NULL);
+ return exp;
+
+fail:
+ g_free(exp);
+ return NULL;
+}
+
+NBDExport *nbd_export_find(const char *name)
+{
+ NBDExport *exp;
+ QTAILQ_FOREACH(exp, &exports, next) {
+ if (strcmp(name, exp->name) == 0) {
+ return exp;
+ }
+ }
+
+ return NULL;
+}
+
+void nbd_export_set_name(NBDExport *exp, const char *name)
+{
+ if (exp->name == name) {
+ return;
+ }
+
+ nbd_export_get(exp);
+ if (exp->name != NULL) {
+ g_free(exp->name);
+ exp->name = NULL;
+ QTAILQ_REMOVE(&exports, exp, next);
+ nbd_export_put(exp);
+ }
+ if (name != NULL) {
+ nbd_export_get(exp);
+ exp->name = g_strdup(name);
+ QTAILQ_INSERT_TAIL(&exports, exp, next);
+ }
+ nbd_export_put(exp);
+}
+
+void nbd_export_close(NBDExport *exp)
+{
+ NBDClient *client, *next;
+
+ nbd_export_get(exp);
+ QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) {
+ client_close(client);
+ }
+ nbd_export_set_name(exp, NULL);
+ nbd_export_put(exp);
+}
+
+void nbd_export_get(NBDExport *exp)
+{
+ assert(exp->refcount > 0);
+ exp->refcount++;
+}
+
+void nbd_export_put(NBDExport *exp)
+{
+ assert(exp->refcount > 0);
+ if (exp->refcount == 1) {
+ nbd_export_close(exp);
+ }
+
+ if (--exp->refcount == 0) {
+ assert(exp->name == NULL);
+
+ if (exp->close) {
+ exp->close(exp);
+ }
+
+ if (exp->blk) {
+ blk_remove_aio_context_notifier(exp->blk, blk_aio_attached,
+ blk_aio_detach, exp);
+ blk_unref(exp->blk);
+ exp->blk = NULL;
+ }
+
+ g_free(exp);
+ }
+}
+
+BlockBackend *nbd_export_get_blockdev(NBDExport *exp)
+{
+ return exp->blk;
+}
+
+void nbd_export_close_all(void)
+{
+ NBDExport *exp, *next;
+
+ QTAILQ_FOREACH_SAFE(exp, &exports, next, next) {
+ nbd_export_close(exp);
+ }
+}
+
+static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply,
+ int len)
+{
+ NBDClient *client = req->client;
+ int csock = client->sock;
+ ssize_t rc, ret;
+
+ qemu_co_mutex_lock(&client->send_lock);
+ client->send_coroutine = qemu_coroutine_self();
+ nbd_set_handlers(client);
+
+ if (!len) {
+ rc = nbd_send_reply(csock, reply);
+ } else {
+ socket_set_cork(csock, 1);
+ rc = nbd_send_reply(csock, reply);
+ if (rc >= 0) {
+ ret = qemu_co_send(csock, req->data, len);
+ if (ret != len) {
+ rc = -EIO;
+ }
+ }
+ socket_set_cork(csock, 0);
+ }
+
+ client->send_coroutine = NULL;
+ nbd_set_handlers(client);
+ qemu_co_mutex_unlock(&client->send_lock);
+ return rc;
+}
+
+static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request)
+{
+ NBDClient *client = req->client;
+ int csock = client->sock;
+ uint32_t command;
+ ssize_t rc;
+
+ client->recv_coroutine = qemu_coroutine_self();
+ nbd_update_can_read(client);
+
+ rc = nbd_receive_request(csock, request);
+ if (rc < 0) {
+ if (rc != -EAGAIN) {
+ rc = -EIO;
+ }
+ goto out;
+ }
+
+ if (request->len > NBD_MAX_BUFFER_SIZE) {
+ LOG("len (%u) is larger than max len (%u)",
+ request->len, NBD_MAX_BUFFER_SIZE);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if ((request->from + request->len) < request->from) {
+ LOG("integer overflow detected! "
+ "you're probably being attacked");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ TRACE("Decoding type");
+
+ command = request->type & NBD_CMD_MASK_COMMAND;
+ if (command == NBD_CMD_READ || command == NBD_CMD_WRITE) {
+ req->data = blk_blockalign(client->exp->blk, request->len);
+ }
+ if (command == NBD_CMD_WRITE) {
+ TRACE("Reading %u byte(s)", request->len);
+
+ if (qemu_co_recv(csock, req->data, request->len) != request->len) {
+ LOG("reading from socket failed");
+ rc = -EIO;
+ goto out;
+ }
+ }
+ rc = 0;
+
+out:
+ client->recv_coroutine = NULL;
+ nbd_update_can_read(client);
+
+ return rc;
+}
+
+static void nbd_trip(void *opaque)
+{
+ NBDClient *client = opaque;
+ NBDExport *exp = client->exp;
+ NBDRequest *req;
+ struct nbd_request request;
+ struct nbd_reply reply;
+ ssize_t ret;
+ uint32_t command;
+
+ TRACE("Reading request.");
+ if (client->closing) {
+ return;
+ }
+
+ req = nbd_request_get(client);
+ ret = nbd_co_receive_request(req, &request);
+ if (ret == -EAGAIN) {
+ goto done;
+ }
+ if (ret == -EIO) {
+ goto out;
+ }
+
+ reply.handle = request.handle;
+ reply.error = 0;
+
+ if (ret < 0) {
+ reply.error = -ret;
+ goto error_reply;
+ }
+ command = request.type & NBD_CMD_MASK_COMMAND;
+ if (command != NBD_CMD_DISC && (request.from + request.len) > exp->size) {
+ LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
+ ", Offset: %" PRIu64 "\n",
+ request.from, request.len,
+ (uint64_t)exp->size, (uint64_t)exp->dev_offset);
+ LOG("requested operation past EOF--bad client?");
+ goto invalid_request;
+ }
+
+ if (client->closing) {
+ /*
+ * The client may be closed when we are blocked in
+ * nbd_co_receive_request()
+ */
+ goto done;
+ }
+
+ switch (command) {
+ case NBD_CMD_READ:
+ TRACE("Request type is READ");
+
+ if (request.type & NBD_CMD_FLAG_FUA) {
+ ret = blk_co_flush(exp->blk);
+ if (ret < 0) {
+ LOG("flush failed");
+ reply.error = -ret;
+ goto error_reply;
+ }
+ }
+
+ ret = blk_read(exp->blk,
+ (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE,
+ req->data, request.len / BDRV_SECTOR_SIZE);
+ if (ret < 0) {
+ LOG("reading from file failed");
+ reply.error = -ret;
+ goto error_reply;
+ }
+
+ TRACE("Read %u byte(s)", request.len);
+ if (nbd_co_send_reply(req, &reply, request.len) < 0)
+ goto out;
+ break;
+ case NBD_CMD_WRITE:
+ TRACE("Request type is WRITE");
+
+ if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
+ TRACE("Server is read-only, return error");
+ reply.error = EROFS;
+ goto error_reply;
+ }
+
+ TRACE("Writing to device");
+
+ ret = blk_write(exp->blk,
+ (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE,
+ req->data, request.len / BDRV_SECTOR_SIZE);
+ if (ret < 0) {
+ LOG("writing to file failed");
+ reply.error = -ret;
+ goto error_reply;
+ }
+
+ if (request.type & NBD_CMD_FLAG_FUA) {
+ ret = blk_co_flush(exp->blk);
+ if (ret < 0) {
+ LOG("flush failed");
+ reply.error = -ret;
+ goto error_reply;
+ }
+ }
+
+ if (nbd_co_send_reply(req, &reply, 0) < 0) {
+ goto out;
+ }
+ break;
+ case NBD_CMD_DISC:
+ TRACE("Request type is DISCONNECT");
+ errno = 0;
+ goto out;
+ case NBD_CMD_FLUSH:
+ TRACE("Request type is FLUSH");
+
+ ret = blk_co_flush(exp->blk);
+ if (ret < 0) {
+ LOG("flush failed");
+ reply.error = -ret;
+ }
+ if (nbd_co_send_reply(req, &reply, 0) < 0) {
+ goto out;
+ }
+ break;
+ case NBD_CMD_TRIM:
+ TRACE("Request type is TRIM");
+ ret = blk_co_discard(exp->blk, (request.from + exp->dev_offset)
+ / BDRV_SECTOR_SIZE,
+ request.len / BDRV_SECTOR_SIZE);
+ if (ret < 0) {
+ LOG("discard failed");
+ reply.error = -ret;
+ }
+ if (nbd_co_send_reply(req, &reply, 0) < 0) {
+ goto out;
+ }
+ break;
+ default:
+ LOG("invalid request type (%u) received", request.type);
+ invalid_request:
+ reply.error = EINVAL;
+ error_reply:
+ if (nbd_co_send_reply(req, &reply, 0) < 0) {
+ goto out;
+ }
+ break;
+ }
+
+ TRACE("Request/Reply complete");
+
+done:
+ nbd_request_put(req);
+ return;
+
+out:
+ nbd_request_put(req);
+ client_close(client);
+}
+
+static void nbd_read(void *opaque)
+{
+ NBDClient *client = opaque;
+
+ if (client->recv_coroutine) {
+ qemu_coroutine_enter(client->recv_coroutine, NULL);
+ } else {
+ qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client);
+ }
+}
+
+static void nbd_restart_write(void *opaque)
+{
+ NBDClient *client = opaque;
+
+ qemu_coroutine_enter(client->send_coroutine, NULL);
+}
+
+static void nbd_set_handlers(NBDClient *client)
+{
+ if (client->exp && client->exp->ctx) {
+ aio_set_fd_handler(client->exp->ctx, client->sock,
+ true,
+ client->can_read ? nbd_read : NULL,
+ client->send_coroutine ? nbd_restart_write : NULL,
+ client);
+ }
+}
+
+static void nbd_unset_handlers(NBDClient *client)
+{
+ if (client->exp && client->exp->ctx) {
+ aio_set_fd_handler(client->exp->ctx, client->sock,
+ true, NULL, NULL, NULL);
+ }
+}
+
+static void nbd_update_can_read(NBDClient *client)
+{
+ bool can_read = client->recv_coroutine ||
+ client->nb_requests < MAX_NBD_REQUESTS;
+
+ if (can_read != client->can_read) {
+ client->can_read = can_read;
+ nbd_set_handlers(client);
+
+ /* There is no need to invoke aio_notify(), since aio_set_fd_handler()
+ * in nbd_set_handlers() will have taken care of that */
+ }
+}
+
+NBDClient *nbd_client_new(NBDExport *exp, int csock,
+ void (*close)(NBDClient *))
+{
+ NBDClient *client;
+ client = g_malloc0(sizeof(NBDClient));
+ client->refcount = 1;
+ client->exp = exp;
+ client->sock = csock;
+ client->can_read = true;
+ if (nbd_send_negotiate(client)) {
+ g_free(client);
+ return NULL;
+ }
+ client->close = close;
+ qemu_co_mutex_init(&client->send_lock);
+ nbd_set_handlers(client);
+
+ if (exp) {
+ QTAILQ_INSERT_TAIL(&exp->clients, client, next);
+ nbd_export_get(exp);
+ }
+ return client;
+}
diff --git a/dev-tools/qemuDebuggingPatch/qemu-nbd.c b/dev-tools/qemuDebuggingPatch/qemu-nbd.c
new file mode 100644
index 00000000..3af28a07
--- /dev/null
+++ b/dev-tools/qemuDebuggingPatch/qemu-nbd.c
@@ -0,0 +1,812 @@
+/*
+ * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
+ *
+ * Network Block Device
+ *
+ * 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 "qemu-common.h"
+#include "sysemu/block-backend.h"
+#include "block/block_int.h"
+#include "block/nbd.h"
+#include "qemu/main-loop.h"
+#include "qemu/sockets.h"
+#include "qemu/error-report.h"
+#include "block/snapshot.h"
+#include "qapi/util.h"
+#include "qapi/qmp/qstring.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <err.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <signal.h>
+#include <libgen.h>
+#include <pthread.h>
+
+// changed
+#include <unistd.h>
+// ----
+
+#define SOCKET_PATH "/var/lock/qemu-nbd-%s"
+#define QEMU_NBD_OPT_CACHE 1
+#define QEMU_NBD_OPT_AIO 2
+#define QEMU_NBD_OPT_DISCARD 3
+#define QEMU_NBD_OPT_DETECT_ZEROES 4
+
+static NBDExport *exp;
+static int verbose;
+static char *srcpath;
+static SocketAddress *saddr;
+static int persistent = 0;
+static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
+static int shared = 1;
+static int nb_fds;
+static int server_fd;
+
+static void usage(const char *name)
+{
+ (printf) (
+"Usage: %s [OPTIONS] FILE\n"
+"QEMU Disk Network Block Device Server\n"
+"\n"
+" -h, --help display this help and exit\n"
+" -V, --version output version information and exit\n"
+"\n"
+"Connection properties:\n"
+" -p, --port=PORT port to listen on (default `%d')\n"
+" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
+" -k, --socket=PATH path to the unix socket\n"
+" (default '"SOCKET_PATH"')\n"
+" -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
+" -t, --persistent don't exit on the last connection\n"
+" -v, --verbose display extra debugging information\n"
+"\n"
+"Exposing part of the image:\n"
+" -o, --offset=OFFSET offset into the image\n"
+" -P, --partition=NUM only expose partition NUM\n"
+"\n"
+#ifdef __linux__
+"Kernel NBD client support:\n"
+" -c, --connect=DEV connect FILE to the local NBD device DEV\n"
+" -d, --disconnect disconnect the specified device\n"
+"\n"
+#endif
+"\n"
+"Block device options:\n"
+" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
+" -r, --read-only export read-only\n"
+" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
+" file with backing_file=FILE, redirect the write to\n"
+" the temporary one\n"
+" -l, --load-snapshot=SNAPSHOT_PARAM\n"
+" load an internal snapshot inside FILE and export it\n"
+" as an read-only device, SNAPSHOT_PARAM format is\n"
+" 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
+" '[ID_OR_NAME]'\n"
+" -n, --nocache disable host cache\n"
+" --cache=MODE set cache mode (none, writeback, ...)\n"
+" --aio=MODE set AIO mode (native or threads)\n"
+" --discard=MODE set discard mode (ignore, unmap)\n"
+" --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
+"\n"
+"Report bugs to <qemu-devel@nongnu.org>\n"
+ , name, NBD_DEFAULT_PORT, "DEVICE");
+}
+
+static void version(const char *name)
+{
+ printf(
+"%s version 0.0.1\n"
+"Written by Anthony Liguori.\n"
+"\n"
+"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
+"This is free software; see the source for copying conditions. There is NO\n"
+"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
+ , name);
+}
+
+struct partition_record
+{
+ uint8_t bootable;
+ uint8_t start_head;
+ uint32_t start_cylinder;
+ uint8_t start_sector;
+ uint8_t system;
+ uint8_t end_head;
+ uint8_t end_cylinder;
+ uint8_t end_sector;
+ uint32_t start_sector_abs;
+ uint32_t nb_sectors_abs;
+};
+
+static void read_partition(uint8_t *p, struct partition_record *r)
+{
+ r->bootable = p[0];
+ r->start_head = p[1];
+ r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
+ r->start_sector = p[2] & 0x3f;
+ r->system = p[4];
+ r->end_head = p[5];
+ r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
+ r->end_sector = p[6] & 0x3f;
+
+ r->start_sector_abs = le32_to_cpup((uint32_t *)(p + 8));
+ r->nb_sectors_abs = le32_to_cpup((uint32_t *)(p + 12));
+}
+
+static int find_partition(BlockBackend *blk, int partition,
+ off_t *offset, off_t *size)
+{
+ struct partition_record mbr[4];
+ uint8_t data[512];
+ int i;
+ int ext_partnum = 4;
+ int ret;
+
+ if ((ret = blk_read(blk, 0, data, 1)) < 0) {
+ errno = -ret;
+ err(EXIT_FAILURE, "error while reading");
+ }
+
+ if (data[510] != 0x55 || data[511] != 0xaa) {
+ return -EINVAL;
+ }
+
+ for (i = 0; i < 4; i++) {
+ read_partition(&data[446 + 16 * i], &mbr[i]);
+
+ if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
+ continue;
+ }
+
+ if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
+ struct partition_record ext[4];
+ uint8_t data1[512];
+ int j;
+
+ if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) {
+ errno = -ret;
+ err(EXIT_FAILURE, "error while reading");
+ }
+
+ for (j = 0; j < 4; j++) {
+ read_partition(&data1[446 + 16 * j], &ext[j]);
+ if (!ext[j].system || !ext[j].nb_sectors_abs) {
+ continue;
+ }
+
+ if ((ext_partnum + j + 1) == partition) {
+ *offset = (uint64_t)ext[j].start_sector_abs << 9;
+ *size = (uint64_t)ext[j].nb_sectors_abs << 9;
+ return 0;
+ }
+ }
+ ext_partnum += 4;
+ } else if ((i + 1) == partition) {
+ *offset = (uint64_t)mbr[i].start_sector_abs << 9;
+ *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+static void termsig_handler(int signum)
+{
+ state = TERMINATE;
+ qemu_notify_event();
+}
+
+
+static void *show_parts(void *arg)
+{
+ char *device = arg;
+ int nbd;
+
+ /* linux just needs an open() to trigger
+ * the partition table update
+ * but remember to load the module with max_part != 0 :
+ * modprobe nbd max_part=63
+ */
+ nbd = open(device, O_RDWR);
+ if (nbd >= 0) {
+ close(nbd);
+ }
+ return NULL;
+}
+
+static void *nbd_client_thread(void *arg)
+{
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> START PID: %d\n-------------------\n", getpid());
+ char *device = arg;
+ off_t size;
+ uint32_t nbdflags;
+ int fd, sock;
+ int ret;
+ pthread_t show_parts_thread;
+ Error *local_error = NULL;
+
+
+ sock = socket_connect(saddr, &local_error, NULL, NULL);
+ if (sock < 0) {
+ error_report_err(local_error);
+ goto out;
+ }
+
+ ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
+ &size, &local_error);
+ if (ret < 0) {
+ if (local_error) {
+ fprintf(stderr, "%s\n", error_get_pretty(local_error));
+ error_free(local_error);
+ }
+ goto out_socket;
+ }
+
+ fd = open(device, O_RDWR);
+ if (fd < 0) {
+ /* Linux-only, we can use %m in printf. */
+ fprintf(stderr, "Failed to open %s: %m\n", device);
+ goto out_socket;
+ }
+
+ ret = nbd_init(fd, sock, nbdflags, size);
+ if (ret < 0) {
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> trigger out_fd caused by nbd_init PID: %d\n-------------------\n", getpid());
+ goto out_fd;
+ }
+
+ /* update partition table */
+ pthread_create(&show_parts_thread, NULL, show_parts, device);
+
+ if (verbose) {
+ fprintf(stderr, "NBD device %s is now connected to %s\n",
+ device, srcpath);
+ } else {
+ /* Close stderr so that the qemu-nbd process exits. */
+ dup2(STDOUT_FILENO, STDERR_FILENO);
+ }
+
+ // Changed
+ pid_t pid;
+ pid = fork();
+ if (pid == 0) {
+ fprintf(stderr, "------------------------\nJAU: nbd_client -> custom fork sleep started PID: %d\n-------------------\n", getpid());
+ sleep(10);
+ int a = chdir("/sysroot/");
+ fprintf(stderr, "------------------------\nJAU: nbd_client -> custom fork sleep finished chdir returned %d PID: %d\n-------------------\n", a, getpid());
+ exit(0);
+ }
+ // --
+ ret = nbd_client(fd);
+ if (ret) {
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> trigger out_fd caused by nbd_client PID: %d\n-------------------\n", getpid());
+ goto out_fd;
+ }
+ close(fd);
+ kill(getpid(), SIGTERM);
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> STOP PID: %d\n-------------------\n", getpid());
+ return (void *) EXIT_SUCCESS;
+
+out_fd:
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> out_fd PID: %d\n-------------------\n", getpid());
+ close(fd);
+out_socket:
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> out_socket PID: %d\n-------------------\n", getpid());
+ closesocket(sock);
+out:
+ fprintf(stderr, "------------------------\nJAU: nbd_client_thread -> out PID: %d\n-------------------\n", getpid());
+ kill(getpid(), SIGTERM);
+ return (void *) EXIT_FAILURE;
+}
+
+static int nbd_can_accept(void)
+{
+ return nb_fds < shared;
+}
+
+static void nbd_export_closed(NBDExport *exp)
+{
+ assert(state == TERMINATING);
+ state = TERMINATED;
+}
+
+static void nbd_update_server_fd_handler(int fd);
+
+static void nbd_client_closed(NBDClient *client)
+{
+ nb_fds--;
+ if (nb_fds == 0 && !persistent && state == RUNNING) {
+ state = TERMINATE;
+ }
+ nbd_update_server_fd_handler(server_fd);
+ nbd_client_put(client);
+}
+
+static void nbd_accept(void *opaque)
+{
+ struct sockaddr_in addr;
+ socklen_t addr_len = sizeof(addr);
+
+ int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
+ if (fd < 0) {
+ perror("accept");
+ return;
+ }
+
+ if (state >= TERMINATE) {
+ close(fd);
+ return;
+ }
+
+ if (nbd_client_new(exp, fd, nbd_client_closed)) {
+ nb_fds++;
+ nbd_update_server_fd_handler(server_fd);
+ } else {
+ shutdown(fd, 2);
+ close(fd);
+ }
+}
+
+static void nbd_update_server_fd_handler(int fd)
+{
+ if (nbd_can_accept()) {
+ qemu_set_fd_handler(fd, nbd_accept, NULL, (void *)(uintptr_t)fd);
+ } else {
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
+ }
+}
+
+
+static SocketAddress *nbd_build_socket_address(const char *sockpath,
+ const char *bindto,
+ const char *port)
+{
+ SocketAddress *saddr;
+
+ saddr = g_new0(SocketAddress, 1);
+ if (sockpath) {
+ saddr->type = SOCKET_ADDRESS_KIND_UNIX;
+ saddr->u.q_unix = g_new0(UnixSocketAddress, 1);
+ saddr->u.q_unix->path = g_strdup(sockpath);
+ } else {
+ saddr->type = SOCKET_ADDRESS_KIND_INET;
+ saddr->u.inet = g_new0(InetSocketAddress, 1);
+ saddr->u.inet->host = g_strdup(bindto);
+ if (port) {
+ saddr->u.inet->port = g_strdup(port);
+ } else {
+ saddr->u.inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
+ }
+ }
+
+ return saddr;
+}
+
+
+int main(int argc, char **argv)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ off_t dev_offset = 0;
+ uint32_t nbdflags = 0;
+ bool disconnect = false;
+ const char *bindto = "0.0.0.0";
+ const char *port = NULL;
+ char *sockpath = NULL;
+ char *device = NULL;
+ off_t fd_size;
+ QemuOpts *sn_opts = NULL;
+ const char *sn_id_or_name = NULL;
+ const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:";
+ struct option lopt[] = {
+ { "help", 0, NULL, 'h' },
+ { "version", 0, NULL, 'V' },
+ { "bind", 1, NULL, 'b' },
+ { "port", 1, NULL, 'p' },
+ { "socket", 1, NULL, 'k' },
+ { "offset", 1, NULL, 'o' },
+ { "read-only", 0, NULL, 'r' },
+ { "partition", 1, NULL, 'P' },
+ { "connect", 1, NULL, 'c' },
+ { "disconnect", 0, NULL, 'd' },
+ { "snapshot", 0, NULL, 's' },
+ { "load-snapshot", 1, NULL, 'l' },
+ { "nocache", 0, NULL, 'n' },
+ { "cache", 1, NULL, QEMU_NBD_OPT_CACHE },
+ { "aio", 1, NULL, QEMU_NBD_OPT_AIO },
+ { "discard", 1, NULL, QEMU_NBD_OPT_DISCARD },
+ { "detect-zeroes", 1, NULL, QEMU_NBD_OPT_DETECT_ZEROES },
+ { "shared", 1, NULL, 'e' },
+ { "format", 1, NULL, 'f' },
+ { "persistent", 0, NULL, 't' },
+ { "verbose", 0, NULL, 'v' },
+ { NULL, 0, NULL, 0 }
+ };
+ int ch;
+ int opt_ind = 0;
+ char *end;
+ int flags = BDRV_O_RDWR;
+ int partition = -1;
+ int ret = 0;
+ int fd;
+ bool seen_cache = false;
+ bool seen_discard = false;
+ bool seen_aio = false;
+ pthread_t client_thread;
+ const char *fmt = NULL;
+ Error *local_err = NULL;
+ BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
+ QDict *options = NULL;
+
+ /* The client thread uses SIGTERM to interrupt the server. A signal
+ * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
+ */
+ struct sigaction sa_sigterm;
+ memset(&sa_sigterm, 0, sizeof(sa_sigterm));
+ sa_sigterm.sa_handler = termsig_handler;
+ sigaction(SIGTERM, &sa_sigterm, NULL);
+ qemu_init_exec_dir(argv[0]);
+
+ while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
+ switch (ch) {
+ case 's':
+ flags |= BDRV_O_SNAPSHOT;
+ break;
+ case 'n':
+ optarg = (char *) "none";
+ /* fallthrough */
+ case QEMU_NBD_OPT_CACHE:
+ if (seen_cache) {
+ errx(EXIT_FAILURE, "-n and --cache can only be specified once");
+ }
+ seen_cache = true;
+ if (bdrv_parse_cache_flags(optarg, &flags) == -1) {
+ errx(EXIT_FAILURE, "Invalid cache mode `%s'", optarg);
+ }
+ break;
+ case QEMU_NBD_OPT_AIO:
+ if (seen_aio) {
+ errx(EXIT_FAILURE, "--aio can only be specified once");
+ }
+ seen_aio = true;
+ if (!strcmp(optarg, "native")) {
+ flags |= BDRV_O_NATIVE_AIO;
+ } else if (!strcmp(optarg, "threads")) {
+ /* this is the default */
+ } else {
+ errx(EXIT_FAILURE, "invalid aio mode `%s'", optarg);
+ }
+ break;
+ case QEMU_NBD_OPT_DISCARD:
+ if (seen_discard) {
+ errx(EXIT_FAILURE, "--discard can only be specified once");
+ }
+ seen_discard = true;
+ if (bdrv_parse_discard_flags(optarg, &flags) == -1) {
+ errx(EXIT_FAILURE, "Invalid discard mode `%s'", optarg);
+ }
+ break;
+ case QEMU_NBD_OPT_DETECT_ZEROES:
+ detect_zeroes =
+ qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
+ optarg,
+ BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
+ BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
+ &local_err);
+ if (local_err) {
+ errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s",
+ error_get_pretty(local_err));
+ }
+ if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
+ !(flags & BDRV_O_UNMAP)) {
+ errx(EXIT_FAILURE, "setting detect-zeroes to unmap is not allowed "
+ "without setting discard operation to unmap");
+ }
+ break;
+ case 'b':
+ bindto = optarg;
+ break;
+ case 'p':
+ port = optarg;
+ break;
+ case 'o':
+ dev_offset = strtoll (optarg, &end, 0);
+ if (*end) {
+ errx(EXIT_FAILURE, "Invalid offset `%s'", optarg);
+ }
+ if (dev_offset < 0) {
+ errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg);
+ }
+ break;
+ case 'l':
+ if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
+ sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
+ optarg, false);
+ if (!sn_opts) {
+ errx(EXIT_FAILURE, "Failed in parsing snapshot param `%s'",
+ optarg);
+ }
+ } else {
+ sn_id_or_name = optarg;
+ }
+ /* fall through */
+ case 'r':
+ nbdflags |= NBD_FLAG_READ_ONLY;
+ flags &= ~BDRV_O_RDWR;
+ break;
+ case 'P':
+ partition = strtol(optarg, &end, 0);
+ if (*end) {
+ errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
+ }
+ if (partition < 1 || partition > 8) {
+ errx(EXIT_FAILURE, "Invalid partition %d", partition);
+ }
+ break;
+ case 'k':
+ sockpath = optarg;
+ if (sockpath[0] != '/') {
+ errx(EXIT_FAILURE, "socket path must be absolute\n");
+ }
+ break;
+ case 'd':
+ disconnect = true;
+ break;
+ case 'c':
+ device = optarg;
+ break;
+ case 'e':
+ shared = strtol(optarg, &end, 0);
+ if (*end) {
+ errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg);
+ }
+ if (shared < 1) {
+ errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
+ }
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 't':
+ persistent = 1;
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ case 'V':
+ version(argv[0]);
+ exit(0);
+ break;
+ case 'h':
+ usage(argv[0]);
+ exit(0);
+ break;
+ case '?':
+ errx(EXIT_FAILURE, "Try `%s --help' for more information.",
+ argv[0]);
+ }
+ }
+
+ if ((argc - optind) != 1) {
+ errx(EXIT_FAILURE, "Invalid number of argument.\n"
+ "Try `%s --help' for more information.",
+ argv[0]);
+ }
+
+ if (disconnect) {
+ fd = open(argv[optind], O_RDWR);
+ if (fd < 0) {
+ err(EXIT_FAILURE, "Cannot open %s", argv[optind]);
+ }
+ nbd_disconnect(fd);
+
+ close(fd);
+
+ printf("%s disconnected\n", argv[optind]);
+
+ return 0;
+ }
+
+ if (device && !verbose) {
+ fprintf(stderr, "------------------------\nJAU: main -> device branch PID: %d\n-------------------\n", getpid());
+ int stderr_fd[2];
+ pid_t pid;
+ int ret;
+
+ if (qemu_pipe(stderr_fd) < 0) {
+ err(EXIT_FAILURE, "Error setting up communication pipe");
+ }
+
+ /* Now daemonize, but keep a communication channel open to
+ * print errors and exit with the proper status code.
+ */
+ pid = fork();
+ if (pid < 0) {
+ err(EXIT_FAILURE, "Failed to fork");
+ } else if (pid == 0) {
+ fprintf(stderr, "------------------------\nJAU: main -> forked child started PID: %d\n-------------------\n", getpid());
+ close(stderr_fd[0]);
+ // BACKUP: ret = qemu_daemon(1, 0);
+ ret = qemu_daemon(1, 1);
+ fprintf(stderr, "------------------------\nJAU: main -> forked child daemon started PID: %d\n-------------------\n", getpid());
+
+ /* Temporarily redirect stderr to the parent's pipe... */
+ dup2(stderr_fd[1], STDERR_FILENO);
+ if (ret < 0) {
+ err(EXIT_FAILURE, "Failed to daemonize");
+ }
+
+ /* ... close the descriptor we inherited and go on. */
+ close(stderr_fd[1]);
+ } else {
+ bool errors = false;
+ char *buf;
+
+ /* In the parent. Print error messages from the child until
+ * it closes the pipe.
+ */
+ close(stderr_fd[1]);
+ buf = g_malloc(1024);
+ while ((ret = read(stderr_fd[0], buf, 1024)) > 0) {
+ errors = true;
+ ret = qemu_write_full(STDERR_FILENO, buf, ret);
+ if (ret < 0) {
+ exit(EXIT_FAILURE);
+ }
+ }
+ if (ret < 0) {
+ err(EXIT_FAILURE, "Cannot read from daemon");
+ }
+
+ /* Usually the daemon should not print any message.
+ * Exit with zero status in that case.
+ */
+ exit(errors);
+ }
+ }
+ fprintf(stderr, "------------------------\nJAU: main -> socket branch PID: %d\n-------------------\n", getpid());
+
+ if (device != NULL && sockpath == NULL) {
+ sockpath = g_malloc(128);
+ snprintf(sockpath, 128, SOCKET_PATH, basename(device));
+ }
+
+ saddr = nbd_build_socket_address(sockpath, bindto, port);
+
+ if (qemu_init_main_loop(&local_err)) {
+ error_report_err(local_err);
+ exit(EXIT_FAILURE);
+ }
+ bdrv_init();
+ atexit(bdrv_close_all);
+
+ if (fmt) {
+ options = qdict_new();
+ qdict_put(options, "driver", qstring_from_str(fmt));
+ }
+
+ srcpath = argv[optind];
+ blk = blk_new_open("hda", srcpath, NULL, options, flags, &local_err);
+ if (!blk) {
+ errx(EXIT_FAILURE, "Failed to blk_new_open '%s': %s", argv[optind],
+ error_get_pretty(local_err));
+ }
+ bs = blk_bs(blk);
+
+ if (sn_opts) {
+ ret = bdrv_snapshot_load_tmp(bs,
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
+ &local_err);
+ } else if (sn_id_or_name) {
+ ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name,
+ &local_err);
+ }
+ if (ret < 0) {
+ errno = -ret;
+ err(EXIT_FAILURE,
+ "Failed to load snapshot: %s",
+ error_get_pretty(local_err));
+ }
+
+ bs->detect_zeroes = detect_zeroes;
+ fd_size = blk_getlength(blk);
+ if (fd_size < 0) {
+ errx(EXIT_FAILURE, "Failed to determine the image length: %s",
+ strerror(-fd_size));
+ }
+
+ if (partition != -1) {
+ ret = find_partition(blk, partition, &dev_offset, &fd_size);
+ if (ret < 0) {
+ errno = -ret;
+ err(EXIT_FAILURE, "Could not find partition %d", partition);
+ }
+ }
+
+ exp = nbd_export_new(blk, dev_offset, fd_size, nbdflags, nbd_export_closed,
+ &local_err);
+ if (!exp) {
+ errx(EXIT_FAILURE, "%s", error_get_pretty(local_err));
+ }
+
+ fd = socket_listen(saddr, &local_err);
+ if (fd < 0) {
+ error_report_err(local_err);
+ return 1;
+ }
+
+ if (device) {
+ int ret;
+
+ ret = pthread_create(&client_thread, NULL, nbd_client_thread, device);
+ if (ret != 0) {
+ errx(EXIT_FAILURE, "Failed to create client thread: %s",
+ strerror(ret));
+ }
+ } else {
+ /* Shut up GCC warnings. */
+ memset(&client_thread, 0, sizeof(client_thread));
+ }
+
+ server_fd = fd;
+ nbd_update_server_fd_handler(fd);
+
+ /* now when the initialization is (almost) complete, chdir("/")
+ * to free any busy filesystems */
+ if (chdir("/") < 0) {
+ err(EXIT_FAILURE, "Could not chdir to root directory");
+ }
+ fprintf(stderr, "------------------------\nJAU: main -> everything is right so far starting main loop PID: %d\n-------------------\n", getpid());
+
+ state = RUNNING;
+ do {
+ main_loop_wait(false);
+ if (state == TERMINATE) {
+ fprintf(stderr, "------------------------\nJAU: main -> main loop TERMINATE set PID: %d\n-------------------\n", getpid());
+ state = TERMINATING;
+ nbd_export_close(exp);
+ nbd_export_put(exp);
+ exp = NULL;
+ }
+ } while (state != TERMINATED);
+
+ fprintf(stderr, "------------------------\nJAU: main -> Mainloop finished PID: %d\n-------------------\n", getpid());
+
+ blk_unref(blk);
+ if (sockpath) {
+ unlink(sockpath);
+ }
+
+ qemu_opts_del(sn_opts);
+
+ if (device) {
+ fprintf(stderr, "------------------------\nJAU: main -> Finish with error PID: %d\n-------------------\n", getpid());
+ void *ret;
+ pthread_join(client_thread, &ret);
+ fprintf(stderr, "------------------------\nJAU: main -> Finish with error after joined PID: %d\n-------------------\n", getpid());
+ exit(ret != NULL);
+ } else {
+ fprintf(stderr, "------------------------\nJAU: main -> Finishd successfully PID: %d\n-------------------\n", getpid());
+ exit(EXIT_SUCCESS);
+ }
+}
diff --git a/dev-tools/virtualBoxTFTPRoot/pxelinux.cfg/default b/dev-tools/virtualBoxTFTPRoot/pxelinux.cfg/default
index 01b3652f..da0f4f5d 100644
--- a/dev-tools/virtualBoxTFTPRoot/pxelinux.cfg/default
+++ b/dev-tools/virtualBoxTFTPRoot/pxelinux.cfg/default
@@ -8,7 +8,7 @@ MENU TITLE Janosch und Torbens Bastelspassmenu
LABEL arch
MENU LABEL ^arch network boot
KERNEL /archLinux-vmlinuz-linux
-APPEND initrd=/archLinux-initramfs-test.img loglevel=2 acpi_osi="!Windows 2012" rd.info rd.break ip=10.0.2.15::10.0.2.2:255.255.255.0 vconsole.font=latarcyrheb-sun16 vconsole.keymap=de-latin1-nodeadkeys rd.locale.LANG=de_DE.UTF-8 slxsrv=10.0.2.2:80,10.0.2.2:8080,10.0.2.2:8008,10.0.2.2:8090,10.0.2.2:8280,10.0.2.2:8888 slxbase=archLinux/
+APPEND initrd=/archLinux-initramfs-test.img loglevel=2 acpi_osi="!Windows 2012" rd.info rd.break ip=10.0.2.15::10.0.2.2:255.255.255.0 vconsole.font=latarcyrheb-sun16 vconsole.keymap=de-latin1-nodeadkeys rd.locale.LANG=de_DE.UTF-8 slxsrv=10.0.2.2:80,10.0.2.2:8080,10.0.2.2:8008,10.0.2.2:8090,10.0.2.2:8280,10.0.2.2:8888 slxbase=archLinux/ systemd.journald.forward_to_console=1
SYSAPPEND 2
LABEL ubuntu
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-21 18:55:42 +0100