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authorPaolo Bonzini <pbonzini@redhat.com>2012-10-02 10:02:46 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2012-10-23 13:54:56 +0200
commitf37afb5ab1921f42043b5527a517eef95c36acf8 (patch)
tree19e1c5119272e95f86a51180997532ec37ba3ab8
parente08c95ce8d66276198704f21ed9df6d99b3477e0 (diff)
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migration (outgoing): add error propagation for all protocols
Error propagation is already there for socket backends. Add it to other protocols, simplifying code that tests for errors that will never happen. With all protocols understanding Error, the code can be simplified further by removing the return value. Unfortunately, the quality of error messages varies depending on where the error is detected, because no Error is passed to the NonBlockingConnectHandler. Thus, the exact error message still cannot be sent to the user if the OS reports it asynchronously via SO_ERROR. If NonBlockingConnectHandler received an Error**, we could for example report the error class and/or message via a new field of the query-migration command even if it is reported asynchronously. Before: (qemu) migrate fd:ffff migrate: An undefined error has occurred (qemu) info migrate (qemu) After: (qemu) migrate fd:ffff migrate: File descriptor named 'ffff' has not been found (qemu) info migrate capabilities: xbzrle: off Migration status: failed total time: 0 milliseconds Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--migration-exec.c18
-rw-r--r--migration-fd.c19
-rw-r--r--migration-tcp.c13
-rw-r--r--migration-unix.c11
-rw-r--r--migration.c17
-rw-r--r--migration.h9
6 files changed, 22 insertions, 65 deletions
diff --git a/migration-exec.c b/migration-exec.c
index 6c97db9..5f3f4b2 100644
--- a/migration-exec.c
+++ b/migration-exec.c
@@ -60,22 +60,18 @@ static int exec_close(MigrationState *s)
return ret;
}
-int exec_start_outgoing_migration(MigrationState *s, const char *command)
+void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
{
FILE *f;
f = popen(command, "w");
if (f == NULL) {
- DPRINTF("Unable to popen exec target\n");
- goto err_after_popen;
+ error_setg_errno(errp, errno, "failed to popen the migration target");
+ return;
}
s->fd = fileno(f);
- if (s->fd == -1) {
- DPRINTF("Unable to retrieve file descriptor for popen'd handle\n");
- goto err_after_open;
- }
-
+ assert(s->fd != -1);
socket_set_nonblock(s->fd);
s->opaque = qemu_popen(f, "w");
@@ -85,12 +81,6 @@ int exec_start_outgoing_migration(MigrationState *s, const char *command)
s->write = file_write;
migrate_fd_connect(s);
- return 0;
-
-err_after_open:
- pclose(f);
-err_after_popen:
- return -1;
}
static void exec_accept_incoming_migration(void *opaque)
diff --git a/migration-fd.c b/migration-fd.c
index 7335167..a7c800a 100644
--- a/migration-fd.c
+++ b/migration-fd.c
@@ -73,30 +73,19 @@ static int fd_close(MigrationState *s)
return 0;
}
-int fd_start_outgoing_migration(MigrationState *s, const char *fdname)
+void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
{
- s->fd = monitor_get_fd(cur_mon, fdname, NULL);
+ s->fd = monitor_get_fd(cur_mon, fdname, errp);
if (s->fd == -1) {
- DPRINTF("fd_migration: invalid file descriptor identifier\n");
- goto err_after_get_fd;
- }
-
- if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
- DPRINTF("Unable to set nonblocking mode on file descriptor\n");
- goto err_after_open;
+ return;
}
+ fcntl(s->fd, F_SETFL, O_NONBLOCK);
s->get_error = fd_errno;
s->write = fd_write;
s->close = fd_close;
migrate_fd_connect(s);
- return 0;
-
-err_after_open:
- close(s->fd);
-err_after_get_fd:
- return -1;
}
static void fd_accept_incoming_migration(void *opaque)
diff --git a/migration-tcp.c b/migration-tcp.c
index e8bc76a..5e54e68 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -68,22 +68,13 @@ static void tcp_wait_for_connect(int fd, void *opaque)
}
}
-int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
- Error **errp)
+void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
{
- Error *local_err = NULL;
-
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
- s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, &local_err);
- if (local_err != NULL) {
- error_propagate(errp, local_err);
- return -1;
- }
-
- return 0;
+ s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
}
static void tcp_accept_incoming_migration(void *opaque)
diff --git a/migration-unix.c b/migration-unix.c
index 5387c21..34a413a 100644
--- a/migration-unix.c
+++ b/migration-unix.c
@@ -68,20 +68,13 @@ static void unix_wait_for_connect(int fd, void *opaque)
}
}
-int unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
+void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
{
- Error *local_err = NULL;
-
s->get_error = unix_errno;
s->write = unix_write;
s->close = unix_close;
- s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, &local_err);
- if (local_err != NULL) {
- error_propagate(errp, local_err);
- return -1;
- }
- return 0;
+ s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
}
static void unix_accept_incoming_migration(void *opaque)
diff --git a/migration.c b/migration.c
index e631f18..ef171d2 100644
--- a/migration.c
+++ b/migration.c
@@ -487,7 +487,6 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
MigrationState *s = migrate_get_current();
MigrationParams params;
const char *p;
- int ret;
params.blk = blk;
params.shared = inc;
@@ -509,27 +508,23 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
s = migrate_init(&params);
if (strstart(uri, "tcp:", &p)) {
- ret = tcp_start_outgoing_migration(s, p, &local_err);
+ tcp_start_outgoing_migration(s, p, &local_err);
#if !defined(WIN32)
} else if (strstart(uri, "exec:", &p)) {
- ret = exec_start_outgoing_migration(s, p);
+ exec_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "unix:", &p)) {
- ret = unix_start_outgoing_migration(s, p, &local_err);
+ unix_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "fd:", &p)) {
- ret = fd_start_outgoing_migration(s, p);
+ fd_start_outgoing_migration(s, p, &local_err);
#endif
} else {
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol");
return;
}
- if (ret < 0 || local_err) {
+ if (local_err) {
migrate_fd_error(s);
- if (!local_err) {
- error_set_errno(errp, -ret, QERR_UNDEFINED_ERROR);
- } else {
- error_propagate(errp, local_err);
- }
+ error_propagate(errp, local_err);
return;
}
diff --git a/migration.h b/migration.h
index 92e0aa9..c805e28 100644
--- a/migration.h
+++ b/migration.h
@@ -59,20 +59,19 @@ void do_info_migrate(Monitor *mon, QObject **ret_data);
int exec_start_incoming_migration(const char *host_port);
-int exec_start_outgoing_migration(MigrationState *s, const char *host_port);
+void exec_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
int tcp_start_incoming_migration(const char *host_port, Error **errp);
-int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
- Error **errp);
+void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
int unix_start_incoming_migration(const char *path, Error **errp);
-int unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
+void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
int fd_start_incoming_migration(const char *path);
-int fd_start_outgoing_migration(MigrationState *s, const char *fdname);
+void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp);
void migrate_fd_error(MigrationState *s);