lxc/0132-lxc-fix-bug-in-cgroup-parent.patch

From 293ee3f82a8236de0a3b66c818b957f0a71c30d7 Mon Sep 17 00:00:00 2001
From: LiFeng <lifeng68@huawei.com>
Date: Wed, 18 Dec 2019 06:00:58 -0500
Subject: [PATCH 132/140] lxc: fix bug in cgroup-parent

Signed-off-by: LiFeng <lifeng68@huawei.com>
---
 src/lxc/cgroups/cgfsng.c | 78 ++++++++++++++++++++++++++++--------------------
 1 file changed, 46 insertions(+), 32 deletions(-)

diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
index 50bdc77..2f86a66 100644
--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -557,45 +557,24 @@ on_error:
 	return false;
 }
 
-/* Initialize the cpuset hierarchy in first directory of @gname and set
- * cgroup.clone_children so that children inherit settings. Since the
- * h->base_path is populated by init or ourselves, we know it is already
- * initialized.
- */
-static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
+static bool build_sub_cpuset_cgroup_dir(char *cgpath)
 {
 	int ret;
 	char v;
-	char *cgpath, *clonechildrenpath, *slash;
-
-	if (!string_in_list(h->controllers, "cpuset"))
-		return true;
-
-	if (*cgname == '/')
-		cgname++;
-	slash = strchr(cgname, '/');
-	if (slash)
-		*slash = '\0';
-
-	cgpath = must_make_path(h->mountpoint, h->container_base_path, cgname, NULL);
-	if (slash)
-		*slash = '/';
+	char *clonechildrenpath = NULL;
 
 	ret = mkdir_p(cgpath, 0755);
 	if (ret < 0) {
 		if (errno != EEXIST) {
 			SYSERROR("Failed to create directory \"%s\"", cgpath);
-			free(cgpath);
 			return false;
 		}
 	}
 
-	clonechildrenpath =
-	        must_make_path(cgpath, "cgroup.clone_children", NULL);
+	clonechildrenpath = must_make_path(cgpath, "cgroup.clone_children", NULL);
 	/* unified hierarchy doesn't have clone_children */
 	if (!file_exists(clonechildrenpath)) {
 		free(clonechildrenpath);
-		free(cgpath);
 		return true;
 	}
 
@@ -603,7 +582,6 @@ static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
 	if (ret < 0) {
 		SYSERROR("Failed to read file \"%s\"", clonechildrenpath);
 		free(clonechildrenpath);
-		free(cgpath);
 		return false;
 	}
 
@@ -611,7 +589,6 @@ static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
 	if (!cg_legacy_filter_and_set_cpus(cgpath, v == '1')) {
 		SYSERROR("Failed to remove isolated cpus");
 		free(clonechildrenpath);
-		free(cgpath);
 		return false;
 	}
 
@@ -619,18 +596,15 @@ static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
 	if (v == '1') {
 		DEBUG("\"cgroup.clone_children\" was already set to \"1\"");
 		free(clonechildrenpath);
-		free(cgpath);
 		return true;
 	}
 
 	/* copy parent's settings */
 	if (!copy_parent_file(cgpath, "cpuset.mems")) {
 		SYSERROR("Failed to copy \"cpuset.mems\" settings");
-		free(cgpath);
 		free(clonechildrenpath);
 		return false;
 	}
-	free(cgpath);
 
 	ret = lxc_write_to_file(clonechildrenpath, "1", 1, false, 0666);
 	if (ret < 0) {
@@ -641,6 +615,48 @@ static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
 	}
 	free(clonechildrenpath);
 	return true;
+
+}
+
+/* Initialize the cpuset hierarchy in first directory of @gname and set
+ * cgroup.clone_children so that children inherit settings. Since the
+ * h->base_path is populated by init or ourselves, we know it is already
+ * initialized.
+ */
+static bool cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
+{
+	char *cgpath, *slash;
+	bool sub_mk_success = false;
+
+	if (!string_in_list(h->controllers, "cpuset"))
+		return true;
+
+	cgname += strspn(cgname, "/");
+
+	slash = strchr(cgname, '/');
+
+	if (slash != NULL) {
+		while (slash) {
+			*slash = '\0';
+			cgpath = must_make_path(h->mountpoint, h->container_base_path, cgname, NULL);
+			sub_mk_success = build_sub_cpuset_cgroup_dir(cgpath);
+			free(cgpath);
+			*slash = '/';
+			if (!sub_mk_success) {
+				return false;
+			}
+			slash = strchr(slash + 1, '/');
+		}
+	} else {
+		cgpath = must_make_path(h->mountpoint, h->container_base_path, cgname, NULL);
+		sub_mk_success = build_sub_cpuset_cgroup_dir(cgpath);
+		free(cgpath);
+		if (!sub_mk_success) {
+			return false;
+		}
+	}
+
+	return true;
 }
 
 /* Given two null-terminated lists of strings, return true if any string is in
@@ -1207,9 +1223,7 @@ static int mkdir_eexist_on_last(const char *dir, mode_t mode)
 {
 	const char *tmp = dir;
 	const char *orig = dir;
-	size_t orig_len;
 
-	orig_len = strlen(dir);
 	do {
 		int ret;
 		size_t cur_len;
@@ -1226,7 +1240,7 @@ static int mkdir_eexist_on_last(const char *dir, mode_t mode)
 
 		ret = mkdir(makeme, mode);
 		if (ret < 0) {
-			if ((errno != EEXIST) || (orig_len == cur_len)) {
+			if (errno != EEXIST) {
 				SYSERROR("Failed to create directory \"%s\"", makeme);
 				free(makeme);
 				return -1;
-- 
1.8.3.1