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cgroup: treat non-existing cgroups like empty ones, to deal with races

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This commit is contained in:
Lennart Poettering 2010-07-13 19:00:01 +02:00
parent edb9aaa8b2
commit 4c633005ea
2 changed files with 22 additions and 18 deletions
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29
src/cgroup-util.c
View File

@ -189,7 +189,7 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self)
done = true;
if ((r = cg_enumerate_processes(controller, path, &f)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
goto finish;
@ -205,8 +205,8 @@ int cg_kill(const char *controller, const char *path, int sig, bool ignore_self)
/* If we haven't killed this process yet, kill
* it */
if (kill(pid, sig) < 0 && errno != ESRCH) {
if (ret >= 0)
if (kill(pid, sig) < 0) {
if (ret >= 0 && errno != ESRCH)
ret = -errno;
} else if (ret == 0)
ret = 1;
@ -258,7 +258,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig
ret = cg_kill(controller, path, sig, ignore_self);
if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
goto finish;
@ -289,7 +289,7 @@ int cg_kill_recursive(const char *controller, const char *path, int sig, bool ig
if (rem)
if ((r = cg_rmdir(controller, path)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
}
@ -351,7 +351,7 @@ int cg_migrate(const char *controller, const char *from, const char *to, bool ig
done = true;
if ((r = cg_enumerate_tasks(controller, from, &f)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
goto finish;
@ -369,7 +369,7 @@ int cg_migrate(const char *controller, const char *from, const char *to, bool ig
continue;
if ((r = cg_attach(controller, to, pid)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ESRCH)
ret = r;
} else if (ret == 0)
ret = 1;
@ -417,7 +417,7 @@ int cg_migrate_recursive(const char *controller, const char *from, const char *t
ret = cg_migrate(controller, from, to, ignore_self);
if ((r = cg_enumerate_subgroups(controller, from, &d)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
goto finish;
}
@ -447,7 +447,7 @@ int cg_migrate_recursive(const char *controller, const char *from, const char *t
if (rem)
if ((r = cg_rmdir(controller, from)) < 0) {
if (ret >= 0)
if (ret >= 0 && r != -ENOENT)
ret = r;
}
@ -517,7 +517,7 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
r = rm_rf(fs, true, delete_root);
free(fs);
return r;
return r == -ENOENT ? 0 : r;
}
int cg_delete(const char *controller, const char *path) {
@ -533,7 +533,7 @@ int cg_delete(const char *controller, const char *path) {
r = cg_migrate_recursive(controller, path, parent, false, true);
free(parent);
return r;
return r == -ENOENT ? 0 : r;
}
int cg_create(const char *controller, const char *path) {
@ -646,6 +646,9 @@ int cg_get_by_pid(const char *controller, pid_t pid, char **path) {
f = fopen(fs, "re");
free(fs);
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
cs = strlen(controller);
while (!feof(f)) {
@ -763,7 +766,7 @@ int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
assert(path);
if ((r = cg_enumerate_tasks(controller, path, &f)) < 0)
return r;
return r == -ENOENT ? 1 : r;
while ((r = cg_read_pid(f, &pid)) > 0) {
@ -794,7 +797,7 @@ int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_
return r;
if ((r = cg_enumerate_subgroups(controller, path, &d)) < 0)
return r;
return r == -ENOENT ? 1 : r;
while ((r = cg_read_subgroup(d, &fn)) > 0) {
char *p = NULL;

11
src/util.c
View File

@ -2565,7 +2565,8 @@ static int rm_rf_children(int fd, bool only_dirs) {
if (!(d = fdopendir(fd))) {
close_nointr_nofail(fd);
return -errno;
return errno == ENOENT ? 0 : -errno;
}
for (;;) {
@ -2589,7 +2590,7 @@ static int rm_rf_children(int fd, bool only_dirs) {
struct stat st;
if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
if (ret == 0)
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
@ -2602,7 +2603,7 @@ static int rm_rf_children(int fd, bool only_dirs) {
int subdir_fd;
if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
if (ret == 0)
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
@ -2613,13 +2614,13 @@ static int rm_rf_children(int fd, bool only_dirs) {
}
if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
if (ret == 0)
if (ret == 0 && errno != ENOENT)
ret = -errno;
}
} else if (!only_dirs) {
if (unlinkat(fd, de->d_name, 0) < 0) {
if (ret == 0)
if (ret == 0 && errno != ENOENT)
ret = -errno;
}
}