diff options
| -rw-r--r-- | kernel/cgroup/cgroup-internal.h | 4 | ||||
| -rw-r--r-- | kernel/cgroup/cgroup-v1.c | 11 | ||||
| -rw-r--r-- | kernel/cgroup/cgroup.c | 40 |
3 files changed, 30 insertions, 25 deletions
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h index dca3193bd9d2..5790e5ff9a0f 100644 --- a/kernel/cgroup/cgroup-internal.h +++ b/kernel/cgroup/cgroup-internal.h @@ -95,8 +95,8 @@ extern const struct file_operations proc_cgroupstats_operations; bool cgroup_ssid_no_v1(int ssid); void cgroup_pidlist_destroy_all(struct cgroup *cgrp); -int cgroup_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, - const char *new_name_str); +int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, + const char *new_name_str); void cgroup_release_agent(struct work_struct *work); void check_for_release(struct cgroup *cgrp); diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 7af745a46f91..0b2c24f0b310 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -800,8 +800,8 @@ out_free: /* * cgroup_rename - Only allow simple rename of directories in place. */ -int cgroup_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, - const char *new_name_str) +int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, + const char *new_name_str) { struct cgroup *cgrp = kn->priv; int ret; @@ -812,13 +812,6 @@ int cgroup_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, return -EIO; /* - * This isn't a proper migration and its usefulness is very - * limited. Disallow on the default hierarchy. - */ - if (cgroup_on_dfl(cgrp)) - return -EPERM; - - /* * We're gonna grab cgroup_mutex which nests outside kernfs * active_ref. kernfs_rename() doesn't require active_ref * protection. Break them before grabbing cgroup_mutex. diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 228dd9ae708b..de6a2ac41d0b 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -1232,6 +1232,7 @@ struct cgroup *task_cgroup_from_root(struct task_struct *task, * update of a tasks cgroup pointer by cgroup_attach_task() */ +static struct kernfs_syscall_ops cgroup1_kf_syscall_ops; static struct kernfs_syscall_ops cgroup_kf_syscall_ops; static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft, @@ -1566,16 +1567,15 @@ static int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node, return len; } -static int cgroup_show_options(struct seq_file *seq, struct kernfs_root *kf_root) +static int cgroup1_show_options(struct seq_file *seq, struct kernfs_root *kf_root) { struct cgroup_root *root = cgroup_root_from_kf(kf_root); struct cgroup_subsys *ss; int ssid; - if (root != &cgrp_dfl_root) - for_each_subsys(ss, ssid) - if (root->subsys_mask & (1 << ssid)) - seq_show_option(seq, ss->legacy_name, NULL); + for_each_subsys(ss, ssid) + if (root->subsys_mask & (1 << ssid)) + seq_show_option(seq, ss->legacy_name, NULL); if (root->flags & CGRP_ROOT_NOPREFIX) seq_puts(seq, ",noprefix"); if (root->flags & CGRP_ROOT_XATTR) @@ -1736,18 +1736,13 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts) return 0; } -static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data) +static int cgroup1_remount(struct kernfs_root *kf_root, int *flags, char *data) { int ret = 0; struct cgroup_root *root = cgroup_root_from_kf(kf_root); struct cgroup_sb_opts opts; u16 added_mask, removed_mask; - if (root == &cgrp_dfl_root) { - pr_err("remount is not allowed\n"); - return -EINVAL; - } - cgroup_lock_and_drain_offline(&cgrp_dfl_root.cgrp); /* See what subsystems are wanted */ @@ -1798,6 +1793,12 @@ static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data) return ret; } +static int cgroup_remount(struct kernfs_root *kf_root, int *flags, char *data) +{ + pr_err("remount is not allowed\n"); + return -EINVAL; +} + /* * To reduce the fork() overhead for systems that are not actually using * their cgroups capability, we don't maintain the lists running through @@ -1900,6 +1901,7 @@ static int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask) { LIST_HEAD(tmp_links); struct cgroup *root_cgrp = &root->cgrp; + struct kernfs_syscall_ops *kf_sops; struct css_set *cset; int i, ret; @@ -1931,7 +1933,10 @@ static int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask) if (ret) goto cancel_ref; - root->kf_root = kernfs_create_root(&cgroup_kf_syscall_ops, + kf_sops = root == &cgrp_dfl_root ? + &cgroup_kf_syscall_ops : &cgroup1_kf_syscall_ops; + + root->kf_root = kernfs_create_root(kf_sops, KERNFS_ROOT_CREATE_DEACTIVATED, root_cgrp); if (IS_ERR(root->kf_root)) { @@ -4813,12 +4818,19 @@ static int cgroup_rmdir(struct kernfs_node *kn) return ret; } +static struct kernfs_syscall_ops cgroup1_kf_syscall_ops = { + .remount_fs = cgroup1_remount, + .show_options = cgroup1_show_options, + .rename = cgroup1_rename, + .mkdir = cgroup_mkdir, + .rmdir = cgroup_rmdir, + .show_path = cgroup_show_path, +}; + static struct kernfs_syscall_ops cgroup_kf_syscall_ops = { .remount_fs = cgroup_remount, - .show_options = cgroup_show_options, .mkdir = cgroup_mkdir, .rmdir = cgroup_rmdir, - .rename = cgroup_rename, .show_path = cgroup_show_path, }; |