[Qemu-devel] [RFC][PATCH 11/16 v6] support detached dump

[Wen Congyang <wency@cn.fujitsu.com>]

Let the user to choose whether to block other monitor command while dumping.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 dump.c           |   12 ++++++++----
 hmp-commands.hx  |    8 ++++----
 hmp.c            |    3 ++-
 qapi-schema.json |    3 ++-
 qmp-commands.hx  |    7 ++++---
 5 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/dump.c b/dump.c
index cb33495..0f5fcb6 100644
--- a/dump.c
+++ b/dump.c
@@ -76,6 +76,7 @@ typedef struct DumpState {
     int state;
     char *error;
     int fd;
+    bool detach;
     target_phys_addr_t memory_offset;
     int64_t bandwidth;
     RAMBlock *block;
@@ -405,7 +406,7 @@ static target_phys_addr_t get_offset(target_phys_addr_t phys_addr,
     return -1;
 }
 
-static DumpState *dump_init(int fd, Error **errp)
+static DumpState *dump_init(int fd, bool detach, Error **errp)
 {
     CPUState *env;
     DumpState *s = dump_get_current();
@@ -422,6 +423,7 @@ static DumpState *dump_init(int fd, Error **errp)
     s->block = QLIST_FIRST(&ram_list.blocks);
     s->start = 0;
     s->timer = NULL;
+    s->detach = detach;
 
     /*
      * get dump info: endian, class and architecture.
@@ -465,7 +467,9 @@ static DumpState *dump_init(int fd, Error **errp)
     }
 
     msg = "terminal does not allow synchronous dumping, continuing detached\n";
-    qemu_suspend_monitor("%s", msg);
+    if (!detach && qemu_suspend_monitor("%s", msg) != 0) {
+        s->detach = true;
+    }
 
     return s;
 }
@@ -665,7 +669,7 @@ static int create_vmcore(DumpState *s)
     return 0;
 }
 
-void qmp_dump(const char *file, Error **errp)
+void qmp_dump(bool detach, const char *file, Error **errp)
 {
     const char *p;
     int fd = -1;
@@ -694,7 +698,7 @@ void qmp_dump(const char *file, Error **errp)
         return;
     }
 
-    s = dump_init(fd, errp);
+    s = dump_init(fd, detach, errp);
     if (!s) {
         return;
     }
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 6cfb678..ed3544c 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -868,18 +868,18 @@ ETEXI
 
     {
         .name       = "dump",
-        .args_type  = "file:s",
+        .args_type  = "detach:-d,file:s",
         .params     = "file",
-        .help       = "dump to file",
+        .help       = "dump to file (using -d to not wait for completion)",
         .user_print = monitor_user_noop,
         .mhandler.cmd = hmp_dump,
     },
 
 
 STEXI
-@item dump @var{file}
+@item dump [-d] @var{file}
 @findex dump
-Dump to @var{file}.
+Dump to @var{file} (using -d to not wait for completion).
 ETEXI
 
     {
diff --git a/hmp.c b/hmp.c
index 1a69857..7e08332 100644
--- a/hmp.c
+++ b/hmp.c
@@ -855,8 +855,9 @@ void hmp_block_job_cancel(Monitor *mon, const QDict *qdict)
 void hmp_dump(Monitor *mon, const QDict *qdict)
 {
     Error *errp = NULL;
+    bool detach = qdict_get_try_bool(qdict, "detach", 0);
     const char *file = qdict_get_str(qdict, "file");
 
-    qmp_dump(file, &errp);
+    qmp_dump(detach, file, &errp);
     hmp_handle_error(mon, &errp);
 }
diff --git a/qapi-schema.json b/qapi-schema.json
index 1013ae6..d39cb41 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1588,10 +1588,11 @@
 #
 # Dump guest's memory to vmcore.
 #
+# @detach: detached dumping.
 # @file: the filename or file descriptor of the vmcore.
 #
 # Returns: nothing on success
 #
 # Since: 1.1
 ##
-{ 'command': 'dump', 'data': { 'file': 'str' } }
+{ 'command': 'dump', 'data': { 'detach': 'bool', 'file': 'str' } }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 52d3d3b..b0aa22e 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -567,9 +567,9 @@ EQMP
 
     {
         .name       = "dump",
-        .args_type  = "file:s",
+        .args_type  = "detach:-d,file:s",
         .params     = "file",
-        .help       = "dump to file",
+        .help       = "dump to file (using -d to not wait for completion)",
         .user_print = monitor_user_noop,
         .mhandler.cmd_new = qmp_marshal_input_dump,
     },
@@ -582,7 +582,8 @@ Dump to file.
 
 Arguments:
 
-- "file": Destination file (json-string)
+- "detach": detached dumping (json-bool, optional)
+- "file":   Destination file (json-string)
 
 Example:
 
-- 
1.7.1