dump: Add futex robust list dumping v3

This patch introduces ThreadCoreEntry protobuf structure which is to carry
thread-specific arch-independent information.

Now put there the c/r futex robust lists.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -565,6 +565,24 @@ out:
 	return ret;
 }
 
+static int get_task_futex_robust_list(pid_t pid, ThreadCoreEntry *info)
+{
+	struct robust_list_head *head = NULL;
+	size_t len = 0;
+	int ret;
+
+	ret = sys_get_robust_list(pid, &head, &len);
+	if (ret) {
+		pr_err("Failed obtaining futex robust list on %d\n", pid);
+		return -1;
+	}
+
+	info->futex_rla		= (u64)head;
+	info->futex_rla_len	= (u32)len;
+
+	return 0;
+}
+
 static int get_task_personality(pid_t pid, u32 *personality)
 {
 	FILE *file = NULL;
@@ -740,6 +758,7 @@ static void core_entry_free(CoreEntry *core)
 			xfree(core->thread_info->fpregs);
 		}
 		xfree(core->thread_info);
+		xfree(core->thread_core);
 		xfree(core->tc);
 		xfree(core->ids);
 	}
@@ -755,6 +774,7 @@ static CoreEntry *core_entry_alloc(int alloc_thread_info,
 	UserX86FpregsEntry *fpregs;
 	TaskCoreEntry *tc;
 	TaskKobjIdsEntry *ids;
+	ThreadCoreEntry *thread_core;
 
 	core = xmalloc(sizeof(*core));
 	if (!core)
@@ -770,6 +790,12 @@ static CoreEntry *core_entry_alloc(int alloc_thread_info,
 		thread_info_x86__init(thread_info);
 		core->thread_info = thread_info;
 
+		thread_core = xmalloc(sizeof(*thread_core));
+		if (!thread_core)
+			goto err;
+		thread_core_entry__init(thread_core);
+		core->thread_core = thread_core;
+
 		gpregs = xmalloc(sizeof(*gpregs));
 		if (!gpregs)
 			goto err;
@@ -847,6 +873,10 @@ static int dump_task_core_all(pid_t pid, const struct proc_pid_stat *stat,
 	if (ret)
 		goto err_free;
 
+	ret = get_task_futex_robust_list(pid, core->thread_core);
+	if (ret)
+		goto err_free;
+
 	ret = get_task_personality(pid, &core->tc->personality);
 	if (ret)
 		goto err_free;
@@ -1233,6 +1263,10 @@ static int dump_task_thread(struct parasite_ctl *parasite_ctl, struct pid *tid)
 	if (ret)
 		goto err_free;
 
+	ret = get_task_futex_robust_list(pid, core->thread_core);
+	if (ret)
+		goto err_free;
+
 	ret = parasite_dump_thread_seized(parasite_ctl, pid, &taddr, &tid->virt);
 	if (ret) {
 		pr_err("Can't dump tid address for pid %d", pid);

protobuf/core.proto

@@ -66,6 +66,11 @@ message thread_info_x86 {
 	required user_x86_fpregs_entry	fpregs		= 3;
 }
 
+message thread_core_entry {
+	required uint64			futex_rla	= 1;
+	required uint32			futex_rla_len	= 2;
+}
+
 message core_entry {
 	enum march {
 		UNKNOWN		= 0;
@@ -77,4 +82,5 @@ message core_entry {
 
 	optional task_core_entry	tc		= 3;
 	optional task_kobj_ids_entry	ids		= 4;
+	optional thread_core_entry	thread_core	= 5;
 }