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Merge pull request #956 from hallyn/2016-04-08/cgnfs-defer
cgfsng: defer to cgfs if needed subsystems are not available
This commit is contained in:
Christian Brauner
commit
bebc48f196
196
src/lxc/cgfsng.c
196
src/lxc/cgfsng.c
@ -72,10 +72,6 @@ struct hierarchy {
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/*
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* The cgroup data which is attached to the lxc_handler.
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* @hierarchies - a NULL-terminated array of struct hierarchy, one per
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* hierarchy. No duplicates. First sufficient, writeable mounted
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* hierarchy wins
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* @cgroup_use - a copy of the lxc.cgroup.use
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* @cgroup_pattern - a copy of the lxc.cgroup.pattern
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* @container_cgroup - if not null, the cgroup which was created for
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* the container. For each hierarchy, it is created under the
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@ -84,13 +80,23 @@ struct hierarchy {
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* @name - the container name
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*/
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struct cgfsng_handler_data {
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struct hierarchy **hierarchies;
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char *cgroup_use;
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char *cgroup_pattern;
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char *container_cgroup; // cgroup we created for the container
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char *name; // container name
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};
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/*
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* @hierarchies - a NULL-terminated array of struct hierarchy, one per
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* hierarchy. No duplicates. First sufficient, writeable mounted
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* hierarchy wins
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*/
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struct hierarchy **hierarchies;
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/*
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* @cgroup_use - a copy of the lxc.cgroup.use
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*/
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char *cgroup_use;
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static void free_string_list(char **clist)
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{
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if (clist) {
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@ -218,25 +224,8 @@ static void must_append_controller(char **klist, char **nlist, char ***clist, ch
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(*clist)[newentry] = copy;
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}
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static void free_hierarchies(struct hierarchy **hlist)
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{
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if (hlist) {
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int i;
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for (i = 0; hlist[i]; i++) {
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free(hlist[i]->mountpoint);
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free(hlist[i]->base_cgroup);
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free(hlist[i]->fullcgpath);
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free_string_list(hlist[i]->controllers);
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}
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free(hlist);
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}
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}
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static void free_handler_data(struct cgfsng_handler_data *d)
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{
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free_hierarchies(d->hierarchies);
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free(d->cgroup_use);
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free(d->cgroup_pattern);
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free(d->container_cgroup);
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free(d->name);
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@ -247,15 +236,15 @@ static void free_handler_data(struct cgfsng_handler_data *d)
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* Given a handler's cgroup data, return the struct hierarchy for the
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* controller @c, or NULL if there is none.
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*/
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struct hierarchy *get_hierarchy(struct cgfsng_handler_data *d, const char *c)
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struct hierarchy *get_hierarchy(const char *c)
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{
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int i;
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if (!d || !d->hierarchies)
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if (!hierarchies)
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return NULL;
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for (i = 0; d->hierarchies[i]; i++) {
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if (string_in_list(d->hierarchies[i]->controllers, c))
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return d->hierarchies[i];
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for (i = 0; hierarchies[i]; i++) {
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if (string_in_list(hierarchies[i]->controllers, c))
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return hierarchies[i];
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}
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return NULL;
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}
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@ -422,10 +411,10 @@ static bool controller_found(struct hierarchy **hlist, char *entry)
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* found. The required list is systemd, freezer, and anything in
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* lxc.cgroup.use.
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*/
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static bool all_controllers_found(struct cgfsng_handler_data *d)
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static bool all_controllers_found(void)
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{
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char *p, *saveptr = NULL;
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struct hierarchy ** hlist = d->hierarchies;
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struct hierarchy ** hlist = hierarchies;
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if (!controller_found(hlist, "name=systemd")) {
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ERROR("no systemd controller mountpoint found");
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@ -436,9 +425,9 @@ static bool all_controllers_found(struct cgfsng_handler_data *d)
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return false;
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}
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if (!d->cgroup_use)
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if (!cgroup_use)
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return true;
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for (p = strtok_r(d->cgroup_use, ",", &saveptr); p;
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for (p = strtok_r(cgroup_use, ",", &saveptr); p;
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p = strtok_r(NULL, ",", &saveptr)) {
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if (!controller_found(hlist, p)) {
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ERROR("no %s controller mountpoint found", p);
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@ -508,8 +497,7 @@ static bool is_cgroupfs(char *line)
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}
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/* Add a controller to our list of hierarchies */
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static void add_controller(struct cgfsng_handler_data *d, char **clist,
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char *mountpoint, char *base_cgroup)
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static void add_controller(char **clist, char *mountpoint, char *base_cgroup)
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{
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struct hierarchy *new;
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int newentry;
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@ -520,8 +508,8 @@ static void add_controller(struct cgfsng_handler_data *d, char **clist,
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new->base_cgroup = base_cgroup;
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new->fullcgpath = NULL;
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newentry = append_null_to_list((void ***)&d->hierarchies);
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d->hierarchies[newentry] = new;
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newentry = append_null_to_list((void ***)&hierarchies);
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hierarchies[newentry] = new;
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}
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/*
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@ -732,16 +720,16 @@ static void print_init_debuginfo(struct cgfsng_handler_data *d)
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printf("Cgroup information:\n");
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printf(" container name: %s\n", d->name);
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printf(" lxc.cgroup.use: %s\n", d->cgroup_use ? d->cgroup_use : "(none)");
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printf(" lxc.cgroup.use: %s\n", cgroup_use ? cgroup_use : "(none)");
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printf(" lxc.cgroup.pattern: %s\n", d->cgroup_pattern);
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printf(" cgroup: %s\n", d->container_cgroup ? d->container_cgroup : "(none)");
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if (!d->hierarchies) {
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if (!hierarchies) {
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printf(" No hierarchies found.\n");
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return;
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}
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printf(" Hierarchies:\n");
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for (i = 0; d->hierarchies[i]; i++) {
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struct hierarchy *h = d->hierarchies[i];
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for (i = 0; hierarchies[i]; i++) {
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struct hierarchy *h = hierarchies[i];
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int j;
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printf(" %d: base_cgroup %s\n", i, h->base_cgroup);
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printf(" mountpoint %s\n", h->mountpoint);
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@ -769,7 +757,7 @@ static void print_basecg_debuginfo(char *basecginfo, char **klist, char **nlist)
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* At startup, parse_hierarchies finds all the info we need about
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* cgroup mountpoints and current cgroups, and stores it in @d.
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*/
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static bool parse_hierarchies(struct cgfsng_handler_data *d)
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static bool parse_hierarchies(void)
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{
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FILE *f;
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char * line = NULL, *basecginfo;
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@ -808,7 +796,7 @@ static bool parse_hierarchies(struct cgfsng_handler_data *d)
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if (!controller_list)
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continue;
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if (controller_list_is_dup(d->hierarchies, controller_list)) {
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if (controller_list_is_dup(hierarchies, controller_list)) {
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free(controller_list);
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continue;
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}
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@ -835,7 +823,7 @@ static bool parse_hierarchies(struct cgfsng_handler_data *d)
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free(base_cgroup);
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continue;
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}
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add_controller(d, controller_list, mountpoint, base_cgroup);
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add_controller(controller_list, mountpoint, base_cgroup);
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}
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free_string_list(klist);
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@ -846,35 +834,39 @@ static bool parse_hierarchies(struct cgfsng_handler_data *d)
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fclose(f);
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free(line);
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print_init_debuginfo(d);
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/* verify that all controllers in cgroup.use and all crucial
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* controllers are accounted for
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*/
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if (!all_controllers_found(d))
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if (!all_controllers_found())
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return false;
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return true;
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}
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static bool collect_hierarchy_info(void)
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{
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const char *tmp;
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errno = 0;
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tmp = lxc_global_config_value("lxc.cgroup.use");
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if (!cgroup_use && errno != 0) { // lxc.cgroup.use can be NULL
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SYSERROR("cgfsng: error reading list of cgroups to use");
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return false;
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}
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cgroup_use = must_copy_string(tmp);
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return parse_hierarchies();
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}
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static void *cgfsng_init(const char *name)
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{
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struct cgfsng_handler_data *d;
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const char *cgroup_use, *cgroup_pattern;
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const char *cgroup_pattern;
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d = must_alloc(sizeof(*d));
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memset(d, 0, sizeof(*d));
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d->name = must_copy_string(name);
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errno = 0;
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cgroup_use = lxc_global_config_value("lxc.cgroup.use");
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if (!cgroup_use && errno != 0) { // lxc.cgroup.use can be NULL
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SYSERROR("Error reading list of cgroups to use");
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goto out_free;
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}
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d->cgroup_use = must_copy_string(cgroup_use);
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cgroup_pattern = lxc_global_config_value("lxc.cgroup.pattern");
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if (!cgroup_pattern) { // lxc.cgroup.pattern is only NULL on error
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ERROR("Error getting cgroup pattern");
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@ -882,9 +874,6 @@ static void *cgfsng_init(const char *name)
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}
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d->cgroup_pattern = must_copy_string(cgroup_pattern);
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if (!parse_hierarchies(d))
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goto out_free;
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print_init_debuginfo(d);
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return d;
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@ -1006,10 +995,10 @@ static void cgfsng_destroy(void *hdata, struct lxc_conf *conf)
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if (!d)
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return;
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if (d->container_cgroup && d->hierarchies) {
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if (d->container_cgroup && hierarchies) {
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int i;
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for (i = 0; d->hierarchies[i]; i++) {
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struct hierarchy *h = d->hierarchies[i];
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for (i = 0; hierarchies[i]; i++) {
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struct hierarchy *h = hierarchies[i];
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if (h->fullcgpath) {
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recursive_destroy(h->fullcgpath, conf);
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free(h->fullcgpath);
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@ -1023,6 +1012,8 @@ static void cgfsng_destroy(void *hdata, struct lxc_conf *conf)
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struct cgroup_ops *cgfsng_ops_init(void)
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{
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if (!collect_hierarchy_info())
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return NULL;
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return &cgfsng_ops;
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}
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@ -1080,14 +1071,14 @@ again:
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}
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if (idx)
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snprintf(offset, 5, "-%d", idx);
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for (i = 0; d->hierarchies[i]; i++) {
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if (!create_path_for_hierarchy(d->hierarchies[i], cgname)) {
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for (i = 0; hierarchies[i]; i++) {
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if (!create_path_for_hierarchy(hierarchies[i], cgname)) {
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int j;
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SYSERROR("Failed to create %s: %s", d->hierarchies[i]->fullcgpath, strerror(errno));
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free(d->hierarchies[i]->fullcgpath);
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d->hierarchies[i]->fullcgpath = NULL;
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SYSERROR("Failed to create %s: %s", hierarchies[i]->fullcgpath, strerror(errno));
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free(hierarchies[i]->fullcgpath);
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hierarchies[i]->fullcgpath = NULL;
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for (j = 0; j < i; j++)
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remove_path_for_hierarchy(d->hierarchies[j], cgname);
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remove_path_for_hierarchy(hierarchies[j], cgname);
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idx++;
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goto again;
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}
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@ -1110,7 +1101,6 @@ static const char *cgfsng_canonical_path(void *hdata)
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static bool cgfsng_enter(void *hdata, pid_t pid)
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{
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struct cgfsng_handler_data *d = hdata;
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char pidstr[25];
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int i, len;
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@ -1118,8 +1108,8 @@ static bool cgfsng_enter(void *hdata, pid_t pid)
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if (len < 0 || len > 25)
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return false;
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for (i = 0; d->hierarchies[i]; i++) {
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char *fullpath = must_make_path(d->hierarchies[i]->fullcgpath,
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for (i = 0; hierarchies[i]; i++) {
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char *fullpath = must_make_path(hierarchies[i]->fullcgpath,
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"cgroup.procs", NULL);
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if (lxc_write_to_file(fullpath, pidstr, len, false) != 0) {
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SYSERROR("Failed to enter %s", fullpath);
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@ -1148,7 +1138,6 @@ struct chown_data {
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static int chown_cgroup_wrapper(void *data)
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{
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struct chown_data *arg = data;
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struct cgfsng_handler_data *d = arg->d;
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uid_t destuid;
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int i;
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@ -1161,8 +1150,8 @@ static int chown_cgroup_wrapper(void *data)
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destuid = get_ns_uid(arg->origuid);
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for (i = 0; d->hierarchies[i]; i++) {
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char *fullpath, *path = d->hierarchies[i]->fullcgpath;
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for (i = 0; hierarchies[i]; i++) {
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char *fullpath, *path = hierarchies[i]->fullcgpath;
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if (chown(path, destuid, 0) < 0) {
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SYSERROR("Error chowning %s to %d", path, (int) destuid);
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@ -1334,9 +1323,9 @@ static bool cgfsng_mount(void *hdata, const char *root, int type)
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root) < 0)
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goto bad;
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for (i = 0; d->hierarchies[i]; i++) {
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for (i = 0; hierarchies[i]; i++) {
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char *controllerpath, *path2;
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struct hierarchy *h = d->hierarchies[i];
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struct hierarchy *h = hierarchies[i];
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char *controller = strrchr(h->mountpoint, '/');
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int r;
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@ -1431,9 +1420,9 @@ static int cgfsng_nrtasks(void *hdata) {
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char *path;
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int count;
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if (!d || !d->container_cgroup || !d->hierarchies)
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if (!d || !d->container_cgroup || !hierarchies)
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return -1;
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path = must_make_path(d->hierarchies[0]->fullcgpath, NULL);
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path = must_make_path(hierarchies[0]->fullcgpath, NULL);
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count = recursive_count_nrtasks(path);
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free(path);
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return count;
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@ -1455,9 +1444,9 @@ static bool cgfsng_escape()
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return false;
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}
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for (i = 0; d->hierarchies[i]; i++) {
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char *fullpath = must_make_path(d->hierarchies[i]->mountpoint,
|
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d->hierarchies[i]->base_cgroup,
|
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for (i = 0; hierarchies[i]; i++) {
|
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char *fullpath = must_make_path(hierarchies[i]->mountpoint,
|
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hierarchies[i]->base_cgroup,
|
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"cgroup.procs", NULL);
|
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if (lxc_write_to_file(fullpath, "0", 2, false) != 0) {
|
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SYSERROR("Failed to escape to %s", fullpath);
|
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@ -1478,11 +1467,10 @@ out:
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|
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static bool cgfsng_unfreeze(void *hdata)
|
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{
|
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struct cgfsng_handler_data *d = hdata;
|
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char *fullpath;
|
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struct hierarchy *h = get_hierarchy(d, "freezer");
|
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struct hierarchy *h = get_hierarchy("freezer");
|
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|
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if (!d || !h)
|
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if (!h)
|
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return false;
|
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fullpath = must_make_path(h->fullcgpath, "freezer.state", NULL);
|
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if (lxc_write_to_file(fullpath, THAWED, THAWED_LEN, false) != 0) {
|
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@ -1495,12 +1483,7 @@ static bool cgfsng_unfreeze(void *hdata)
|
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|
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static const char *cgfsng_get_cgroup(void *hdata, const char *subsystem)
|
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{
|
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struct cgfsng_handler_data *d = hdata;
|
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struct hierarchy *h;
|
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if (!d)
|
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return NULL;
|
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|
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h = get_hierarchy(d, subsystem);
|
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struct hierarchy *h = get_hierarchy(subsystem);
|
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if (!h)
|
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return NULL;
|
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|
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@ -1527,7 +1510,6 @@ static char *build_full_cgpath_from_monitorpath(struct hierarchy *h,
|
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|
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static bool cgfsng_attach(const char *name, const char *lxcpath, pid_t pid)
|
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{
|
||||
struct cgfsng_handler_data *d;
|
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char pidstr[25];
|
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int i, len;
|
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|
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@ -1535,13 +1517,9 @@ static bool cgfsng_attach(const char *name, const char *lxcpath, pid_t pid)
|
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if (len < 0 || len > 25)
|
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return false;
|
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|
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d = cgfsng_init(name);
|
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if (!d)
|
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return false;
|
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|
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for (i = 0; d->hierarchies[i]; i++) {
|
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for (i = 0; hierarchies[i]; i++) {
|
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char *path, *fullpath;
|
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struct hierarchy *h = d->hierarchies[i];
|
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struct hierarchy *h = hierarchies[i];
|
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|
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path = lxc_cmd_get_cgroup_path(name, lxcpath, h->controllers[0]);
|
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if (!path) // not running
|
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@ -1552,13 +1530,11 @@ static bool cgfsng_attach(const char *name, const char *lxcpath, pid_t pid)
|
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if (lxc_write_to_file(fullpath, pidstr, len, false) != 0) {
|
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SYSERROR("Failed to attach %d to %s", (int)pid, fullpath);
|
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free(fullpath);
|
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free_handler_data(d);
|
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return false;
|
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}
|
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free(fullpath);
|
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}
|
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|
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free_handler_data(d);
|
||||
return true;
|
||||
}
|
||||
|
||||
@ -1570,7 +1546,6 @@ static bool cgfsng_attach(const char *name, const char *lxcpath, pid_t pid)
|
||||
static int cgfsng_get(const char *filename, char *value, size_t len, const char *name, const char *lxcpath)
|
||||
{
|
||||
char *subsystem, *p, *path;
|
||||
struct cgfsng_handler_data *d;
|
||||
struct hierarchy *h;
|
||||
int ret = -1;
|
||||
|
||||
@ -1583,20 +1558,13 @@ static int cgfsng_get(const char *filename, char *value, size_t len, const char
|
||||
if (!path) // not running
|
||||
return -1;
|
||||
|
||||
d = cgfsng_init(name);
|
||||
if (!d) {
|
||||
free(path);
|
||||
return false;
|
||||
}
|
||||
|
||||
h = get_hierarchy(d, subsystem);
|
||||
h = get_hierarchy(subsystem);
|
||||
if (h) {
|
||||
char *fullpath = build_full_cgpath_from_monitorpath(h, path, filename);
|
||||
ret = lxc_read_from_file(fullpath, value, len);
|
||||
free(fullpath);
|
||||
}
|
||||
|
||||
free_handler_data(d);
|
||||
free(path);
|
||||
|
||||
return ret;
|
||||
@ -1610,7 +1578,6 @@ static int cgfsng_get(const char *filename, char *value, size_t len, const char
|
||||
static int cgfsng_set(const char *filename, const char *value, const char *name, const char *lxcpath)
|
||||
{
|
||||
char *subsystem, *p, *path;
|
||||
struct cgfsng_handler_data *d;
|
||||
struct hierarchy *h;
|
||||
int ret = -1;
|
||||
|
||||
@ -1623,20 +1590,13 @@ static int cgfsng_set(const char *filename, const char *value, const char *name,
|
||||
if (!path) // not running
|
||||
return -1;
|
||||
|
||||
d = cgfsng_init(name);
|
||||
if (!d) {
|
||||
free(path);
|
||||
return false;
|
||||
}
|
||||
|
||||
h = get_hierarchy(d, subsystem);
|
||||
h = get_hierarchy(subsystem);
|
||||
if (h) {
|
||||
char *fullpath = build_full_cgpath_from_monitorpath(h, path, filename);
|
||||
ret = lxc_write_to_file(fullpath, value, strlen(value), false);
|
||||
free(fullpath);
|
||||
}
|
||||
|
||||
free_handler_data(d);
|
||||
free(path);
|
||||
|
||||
return ret;
|
||||
@ -1657,7 +1617,7 @@ static int lxc_cgroup_set_data(const char *filename, const char *value, struct c
|
||||
if ((p = strchr(subsystem, '.')) != NULL)
|
||||
*p = '\0';
|
||||
|
||||
h = get_hierarchy(d, subsystem);
|
||||
h = get_hierarchy(subsystem);
|
||||
if (h) {
|
||||
char *fullpath = must_make_path(h->fullcgpath, filename, NULL);
|
||||
ret = lxc_write_to_file(fullpath, value, strlen(value), false);
|
||||
@ -1685,7 +1645,7 @@ static bool cgfsng_setup_limits(void *hdata, struct lxc_list *cgroup_settings,
|
||||
}
|
||||
|
||||
if (do_devices) {
|
||||
h = get_hierarchy(d, "devices");
|
||||
h = get_hierarchy("devices");
|
||||
if (!h) {
|
||||
ERROR("No devices cgroup setup for %s", d->name);
|
||||
return false;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user