In preparation for adding support for cgroup v2, this commit
moves the cgroup v1 mount logic out of cgroup_init() and into
its own function. No functional changes were made.
Signed-off-by: Tom Hromatka <tom.hroma...@oracle.com>
---
src/api.c | 220 +++++++++++++++++++++++++++++-------------------------
1 file changed, 119 insertions(+), 101 deletions(-)
diff --git a/src/api.c b/src/api.c
index 24ae48d35911..3845352f07cf 100644
--- a/src/api.c
+++ b/src/api.c
@@ -1033,6 +1033,120 @@ int cg_add_duplicate_mount(struct cg_mount_table_s
*item, const char *path)
return 0;
}
+/**
+ * Process a cgroup v1 mount and add it to cg_mount_table if it's not a
+ * duplicate.
+ *
+ * @param controllers List of controllers from /proc/cgroups
+ * @param ent File system description of cgroup mount being processed
+ * @param mnt_tbl_idx cg_mount_table index
+ */
+static int cgroup_process_v1_mnt(char *controllers[], struct mntent *ent,
+ int *mnt_tbl_idx)
+{
+ char *strtok_buffer = NULL, *mntopt = NULL;
+ int duplicate = 0;
+ int i, j, ret = 0;
+
+ for (i = 0; controllers[i] != NULL; i++) {
+ mntopt = hasmntopt(ent, controllers[i]);
+
+ if (!mntopt)
+ continue;
+
+ cgroup_dbg("found %s in %s\n", controllers[i], ent->mnt_opts);
+
+ /* do not have duplicates in mount table */
+ duplicate = 0;
+ for (j = 0; j < *mnt_tbl_idx; j++) {
+ if (strncmp(controllers[i],
+ cg_mount_table[j].name,
+ FILENAME_MAX) == 0) {
+ duplicate = 1;
+ break;
+ }
+ }
+
+ if (duplicate) {
+ cgroup_dbg("controller %s is already mounted on %s\n",
+ mntopt, cg_mount_table[j].mount.path);
+ ret = cg_add_duplicate_mount(&cg_mount_table[j],
+ ent->mnt_dir);
+ if (ret)
+ goto out;
+ /* continue with next controller */
+ continue;
+ }
+
+ strncpy(cg_mount_table[*mnt_tbl_idx].name,
+ controllers[i], FILENAME_MAX);
+ cg_mount_table[*mnt_tbl_idx].name[FILENAME_MAX-1] = '\0';
+ strncpy(cg_mount_table[*mnt_tbl_idx].mount.path,
+ ent->mnt_dir, FILENAME_MAX);
+ cg_mount_table[*mnt_tbl_idx].mount.path[FILENAME_MAX-1] =
+ '\0';
+ cg_mount_table[*mnt_tbl_idx].mount.next = NULL;
+ cgroup_dbg("Found cgroup option %s, count %d\n",
+ ent->mnt_opts, *mnt_tbl_idx);
+ (*mnt_tbl_idx)++;
+ }
+
+ /*
+ * Doesn't match the controller.
+ * Check if it is a named hierarchy.
+ */
+ mntopt = hasmntopt(ent, "name");
+
+ if (mntopt) {
+ mntopt = strtok_r(mntopt, ",", &strtok_buffer);
+ if (!mntopt)
+ goto out;
+ /*
+ * Check if it is a duplicate
+ */
+ duplicate = 0;
+
+#ifdef OPAQUE_HIERARCHY
+ /*
+ * Ignore the opaque hierarchy.
+ */
+ if (strcmp(mntopt, OPAQUE_HIERARCHY) == 0)
+ goto out;
+#endif
+
+ for (j = 0; j < *mnt_tbl_idx; j++) {
+ if (strncmp(mntopt, cg_mount_table[j].name,
+ FILENAME_MAX) == 0) {
+ duplicate = 1;
+ break;
+ }
+ }
+
+ if (duplicate) {
+ cgroup_dbg("controller %s is already mounted on %s\n",
+ mntopt, cg_mount_table[j].mount.path);
+ ret = cg_add_duplicate_mount(&cg_mount_table[j],
+ ent->mnt_dir);
+ goto out;
+ }
+
+ strncpy(cg_mount_table[*mnt_tbl_idx].name,
+ mntopt, FILENAME_MAX);
+ cg_mount_table[*mnt_tbl_idx].name[FILENAME_MAX-1] = '\0';
+ strncpy(cg_mount_table[*mnt_tbl_idx].mount.path,
+ ent->mnt_dir, FILENAME_MAX);
+ cg_mount_table[*mnt_tbl_idx].mount.path[FILENAME_MAX-1] =
+ '\0';
+ cg_mount_table[*mnt_tbl_idx].mount.next = NULL;
+ cgroup_dbg("Found cgroup option %s, count %d\n",
+ ent->mnt_opts, *mnt_tbl_idx);
+ (*mnt_tbl_idx)++;
+ }
+
+out:
+ return ret;
+}
+
/**
* cgroup_init(), initializes the MOUNT_POINT.
*
@@ -1053,13 +1167,9 @@ int cgroup_init(void)
char subsys_name[FILENAME_MAX];
int hierarchy, num_cgroups, enabled;
int i = 0;
- int j;
- int duplicate = 0;
- char *mntopt = NULL;
int err;
char *buf = NULL;
char mntent_buffer[4 * FILENAME_MAX];
- char *strtok_buffer = NULL;
cgroup_set_default_logger(-1);
@@ -1139,103 +1249,11 @@ int cgroup_init(void)
while ((ent = getmntent_r(proc_mount, temp_ent,
mntent_buffer,
sizeof(mntent_buffer))) != NULL) {
- if (strcmp(ent->mnt_type, "cgroup"))
- continue;
-
- for (i = 0; controllers[i] != NULL; i++) {
- mntopt = hasmntopt(ent, controllers[i]);
-
- if (!mntopt)
- continue;
-
- cgroup_dbg("found %s in %s\n", controllers[i],
ent->mnt_opts);
-
- /* do not have duplicates in mount table */
- duplicate = 0;
- for (j = 0; j < found_mnt; j++) {
- if (strncmp(controllers[i],
- cg_mount_table[j].name,
- FILENAME_MAX) == 0) {
- duplicate = 1;
- break;
- }
- }
- if (duplicate) {
- cgroup_dbg("controller %s is already mounted on
%s\n",
- mntopt, cg_mount_table[j].mount.path);
- ret = cg_add_duplicate_mount(&cg_mount_table[j],
- ent->mnt_dir);
- if (ret)
- goto unlock_exit;
- /* continue with next controller */
- continue;
- }
-
- strncpy(cg_mount_table[found_mnt].name,
- controllers[i], FILENAME_MAX);
- cg_mount_table[found_mnt].name[FILENAME_MAX-1] = '\0';
- strncpy(cg_mount_table[found_mnt].mount.path,
- ent->mnt_dir, FILENAME_MAX);
- cg_mount_table[found_mnt].mount.path[FILENAME_MAX-1] =
- '\0';
- cg_mount_table[found_mnt].mount.next = NULL;
- cgroup_dbg("Found cgroup option %s, count %d\n",
- ent->mnt_opts, found_mnt);
- found_mnt++;
- }
-
- /*
- * Doesn't match the controller.
- * Check if it is a named hierarchy.
- */
- mntopt = hasmntopt(ent, "name");
-
- if (mntopt) {
- mntopt = strtok_r(mntopt, ",", &strtok_buffer);
- if (!mntopt)
- continue;
- /*
- * Check if it is a duplicate
- */
- duplicate = 0;
-
-#ifdef OPAQUE_HIERARCHY
- /*
- * Ignore the opaque hierarchy.
- */
- if (strcmp(mntopt, OPAQUE_HIERARCHY) == 0)
- continue;
-#endif
-
- for (j = 0; j < found_mnt; j++) {
- if (strncmp(mntopt, cg_mount_table[j].name,
- FILENAME_MAX) == 0) {
- duplicate = 1;
- break;
- }
- }
-
- if (duplicate) {
- cgroup_dbg("controller %s is already mounted on
%s\n",
- mntopt, cg_mount_table[j].mount.path);
- ret = cg_add_duplicate_mount(&cg_mount_table[j],
- ent->mnt_dir);
- if (ret)
- goto unlock_exit;
- continue;
- }
-
- strncpy(cg_mount_table[found_mnt].name,
- mntopt, FILENAME_MAX);
- cg_mount_table[found_mnt].name[FILENAME_MAX-1] = '\0';
- strncpy(cg_mount_table[found_mnt].mount.path,
- ent->mnt_dir, FILENAME_MAX);
- cg_mount_table[found_mnt].mount.path[FILENAME_MAX-1] =
- '\0';
- cg_mount_table[found_mnt].mount.next = NULL;
- cgroup_dbg("Found cgroup option %s, count %d\n",
- ent->mnt_opts, found_mnt);
- found_mnt++;
+ if (strcmp(ent->mnt_type, "cgroup") == 0) {
+ ret = cgroup_process_v1_mnt(controllers, ent,
+ &found_mnt);
+ if (ret)
+ goto unlock_exit;
}
}
--
2.25.3
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