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cgroup: take options parsing into ->parse_monolithic()
Store the results in cgroup_fs_context. There's a nasty twist caused
by the enabling/disabling subsystems - we can't do the checks sensitive
to that until cgroup_mutex gets grabbed. Frankly, these checks are
complete bullshit (e.g. all,none combination is accepted if all subsystems
are disabled; so's cpusets,none and all,cpusets when cpusets is disabled,
etc.), but touching that would be a userland-visible behaviour change ;-/
So we do parsing in ->parse_monolithic() and have the consistency checks
done in check_cgroupfs_options(), with the latter called (on already parsed
options) from cgroup1_get_tree() and cgroup1_reconfigure().
Freeing the strdup'ed strings is done from fs_context destructor, which
somewhat simplifies the life for cgroup1_{get_tree,reconfigure}().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
7feeef5869
commit
f5dfb5315d
3 changed files with 104 additions and 116 deletions
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@ -41,7 +41,15 @@ extern void __init enable_debug_cgroup(void);
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* The cgroup filesystem superblock creation/mount context.
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*/
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struct cgroup_fs_context {
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char *data;
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unsigned int flags; /* CGRP_ROOT_* flags */
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/* cgroup1 bits */
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bool cpuset_clone_children;
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bool none; /* User explicitly requested empty subsystem */
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bool all_ss; /* Seen 'all' option */
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u16 subsys_mask; /* Selected subsystems */
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char *name; /* Hierarchy name */
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char *release_agent; /* Path for release notifications */
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};
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static inline struct cgroup_fs_context *cgroup_fc2context(struct fs_context *fc)
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@ -130,16 +138,6 @@ struct cgroup_mgctx {
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#define DEFINE_CGROUP_MGCTX(name) \
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struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name)
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struct cgroup_sb_opts {
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u16 subsys_mask;
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unsigned int flags;
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char *release_agent;
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bool cpuset_clone_children;
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char *name;
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/* User explicitly requested empty subsystem */
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bool none;
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};
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extern struct mutex cgroup_mutex;
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extern spinlock_t css_set_lock;
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extern struct cgroup_subsys *cgroup_subsys[];
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@ -210,7 +208,7 @@ int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen,
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struct cgroup_namespace *ns);
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void cgroup_free_root(struct cgroup_root *root);
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void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts);
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void init_cgroup_root(struct cgroup_root *root, struct cgroup_fs_context *ctx);
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int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask);
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int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask);
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struct dentry *cgroup_do_mount(struct file_system_type *fs_type, int flags,
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@ -266,6 +264,7 @@ void cgroup1_pidlist_destroy_all(struct cgroup *cgrp);
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void cgroup1_release_agent(struct work_struct *work);
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void cgroup1_check_for_release(struct cgroup *cgrp);
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int cgroup1_get_tree(struct fs_context *fc);
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int parse_cgroup1_options(char *data, struct cgroup_fs_context *ctx);
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int cgroup1_reconfigure(struct fs_context *ctx);
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#endif /* __CGROUP_INTERNAL_H */
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@ -906,61 +906,47 @@ static int cgroup1_show_options(struct seq_file *seq, struct kernfs_root *kf_roo
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return 0;
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}
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static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
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int parse_cgroup1_options(char *data, struct cgroup_fs_context *ctx)
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{
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char *token, *o = data;
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bool all_ss = false, one_ss = false;
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u16 mask = U16_MAX;
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struct cgroup_subsys *ss;
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int nr_opts = 0;
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int i;
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#ifdef CONFIG_CPUSETS
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mask = ~((u16)1 << cpuset_cgrp_id);
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#endif
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memset(opts, 0, sizeof(*opts));
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while ((token = strsep(&o, ",")) != NULL) {
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nr_opts++;
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if (!*token)
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return -EINVAL;
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if (!strcmp(token, "none")) {
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/* Explicitly have no subsystems */
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opts->none = true;
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ctx->none = true;
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continue;
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}
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if (!strcmp(token, "all")) {
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/* Mutually exclusive option 'all' + subsystem name */
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if (one_ss)
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return -EINVAL;
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all_ss = true;
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ctx->all_ss = true;
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continue;
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}
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if (!strcmp(token, "noprefix")) {
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opts->flags |= CGRP_ROOT_NOPREFIX;
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ctx->flags |= CGRP_ROOT_NOPREFIX;
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continue;
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}
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if (!strcmp(token, "clone_children")) {
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opts->cpuset_clone_children = true;
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ctx->cpuset_clone_children = true;
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continue;
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}
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if (!strcmp(token, "cpuset_v2_mode")) {
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opts->flags |= CGRP_ROOT_CPUSET_V2_MODE;
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ctx->flags |= CGRP_ROOT_CPUSET_V2_MODE;
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continue;
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}
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if (!strcmp(token, "xattr")) {
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opts->flags |= CGRP_ROOT_XATTR;
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ctx->flags |= CGRP_ROOT_XATTR;
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continue;
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}
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if (!strncmp(token, "release_agent=", 14)) {
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/* Specifying two release agents is forbidden */
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if (opts->release_agent)
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if (ctx->release_agent)
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return -EINVAL;
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opts->release_agent =
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ctx->release_agent =
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kstrndup(token + 14, PATH_MAX - 1, GFP_KERNEL);
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if (!opts->release_agent)
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if (!ctx->release_agent)
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return -ENOMEM;
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continue;
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}
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@ -983,12 +969,12 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
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return -EINVAL;
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}
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/* Specifying two names is forbidden */
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if (opts->name)
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if (ctx->name)
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return -EINVAL;
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opts->name = kstrndup(name,
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ctx->name = kstrndup(name,
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MAX_CGROUP_ROOT_NAMELEN - 1,
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GFP_KERNEL);
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if (!opts->name)
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if (!ctx->name)
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return -ENOMEM;
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continue;
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@ -997,38 +983,51 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
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for_each_subsys(ss, i) {
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if (strcmp(token, ss->legacy_name))
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continue;
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if (!cgroup_ssid_enabled(i))
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continue;
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if (cgroup1_ssid_disabled(i))
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continue;
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/* Mutually exclusive option 'all' + subsystem name */
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if (all_ss)
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return -EINVAL;
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opts->subsys_mask |= (1 << i);
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one_ss = true;
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ctx->subsys_mask |= (1 << i);
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break;
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}
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if (i == CGROUP_SUBSYS_COUNT)
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return -ENOENT;
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}
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return 0;
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}
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/*
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* If the 'all' option was specified select all the subsystems,
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* otherwise if 'none', 'name=' and a subsystem name options were
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* not specified, let's default to 'all'
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*/
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if (all_ss || (!one_ss && !opts->none && !opts->name))
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static int check_cgroupfs_options(struct cgroup_fs_context *ctx)
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{
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u16 mask = U16_MAX;
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u16 enabled = 0;
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struct cgroup_subsys *ss;
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int i;
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#ifdef CONFIG_CPUSETS
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mask = ~((u16)1 << cpuset_cgrp_id);
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#endif
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for_each_subsys(ss, i)
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if (cgroup_ssid_enabled(i) && !cgroup1_ssid_disabled(i))
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opts->subsys_mask |= (1 << i);
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enabled |= 1 << i;
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ctx->subsys_mask &= enabled;
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/*
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* In absense of 'none', 'name=' or subsystem name options,
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* let's default to 'all'.
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*/
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if (!ctx->subsys_mask && !ctx->none && !ctx->name)
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ctx->all_ss = true;
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if (ctx->all_ss) {
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/* Mutually exclusive option 'all' + subsystem name */
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if (ctx->subsys_mask)
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return -EINVAL;
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/* 'all' => select all the subsystems */
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ctx->subsys_mask = enabled;
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}
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/*
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* We either have to specify by name or by subsystems. (So all
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* empty hierarchies must have a name).
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*/
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if (!opts->subsys_mask && !opts->name)
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if (!ctx->subsys_mask && !ctx->name)
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return -EINVAL;
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/*
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@ -1036,11 +1035,11 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
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* with the old cpuset, so we allow noprefix only if mounting just
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* the cpuset subsystem.
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*/
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if ((opts->flags & CGRP_ROOT_NOPREFIX) && (opts->subsys_mask & mask))
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if ((ctx->flags & CGRP_ROOT_NOPREFIX) && (ctx->subsys_mask & mask))
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return -EINVAL;
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/* Can't specify "none" and some subsystems */
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if (opts->subsys_mask && opts->none)
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if (ctx->subsys_mask && ctx->none)
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return -EINVAL;
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return 0;
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@ -1052,28 +1051,27 @@ int cgroup1_reconfigure(struct fs_context *fc)
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struct kernfs_root *kf_root = kernfs_root_from_sb(fc->root->d_sb);
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struct cgroup_root *root = cgroup_root_from_kf(kf_root);
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int ret = 0;
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struct cgroup_sb_opts opts;
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u16 added_mask, removed_mask;
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cgroup_lock_and_drain_offline(&cgrp_dfl_root.cgrp);
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/* See what subsystems are wanted */
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ret = parse_cgroupfs_options(ctx->data, &opts);
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ret = check_cgroupfs_options(ctx);
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if (ret)
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goto out_unlock;
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if (opts.subsys_mask != root->subsys_mask || opts.release_agent)
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if (ctx->subsys_mask != root->subsys_mask || ctx->release_agent)
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pr_warn("option changes via remount are deprecated (pid=%d comm=%s)\n",
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task_tgid_nr(current), current->comm);
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added_mask = opts.subsys_mask & ~root->subsys_mask;
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removed_mask = root->subsys_mask & ~opts.subsys_mask;
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added_mask = ctx->subsys_mask & ~root->subsys_mask;
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removed_mask = root->subsys_mask & ~ctx->subsys_mask;
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/* Don't allow flags or name to change at remount */
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if ((opts.flags ^ root->flags) ||
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(opts.name && strcmp(opts.name, root->name))) {
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if ((ctx->flags ^ root->flags) ||
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(ctx->name && strcmp(ctx->name, root->name))) {
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pr_err("option or name mismatch, new: 0x%x \"%s\", old: 0x%x \"%s\"\n",
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opts.flags, opts.name ?: "", root->flags, root->name);
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ctx->flags, ctx->name ?: "", root->flags, root->name);
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ret = -EINVAL;
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goto out_unlock;
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}
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@ -1090,17 +1088,15 @@ int cgroup1_reconfigure(struct fs_context *fc)
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WARN_ON(rebind_subsystems(&cgrp_dfl_root, removed_mask));
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if (opts.release_agent) {
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if (ctx->release_agent) {
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spin_lock(&release_agent_path_lock);
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strcpy(root->release_agent_path, opts.release_agent);
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strcpy(root->release_agent_path, ctx->release_agent);
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spin_unlock(&release_agent_path_lock);
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}
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trace_cgroup_remount(root);
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out_unlock:
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kfree(opts.release_agent);
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kfree(opts.name);
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mutex_unlock(&cgroup_mutex);
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return ret;
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}
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@ -1117,7 +1113,6 @@ int cgroup1_get_tree(struct fs_context *fc)
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{
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struct cgroup_namespace *ns = current->nsproxy->cgroup_ns;
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struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
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struct cgroup_sb_opts opts;
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struct cgroup_root *root;
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struct cgroup_subsys *ss;
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struct dentry *dentry;
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@ -1130,7 +1125,7 @@ int cgroup1_get_tree(struct fs_context *fc)
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cgroup_lock_and_drain_offline(&cgrp_dfl_root.cgrp);
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/* First find the desired set of subsystems */
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ret = parse_cgroupfs_options(ctx->data, &opts);
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ret = check_cgroupfs_options(ctx);
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if (ret)
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goto out_unlock;
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@ -1142,7 +1137,7 @@ int cgroup1_get_tree(struct fs_context *fc)
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* starting. Testing ref liveliness is good enough.
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*/
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for_each_subsys(ss, i) {
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if (!(opts.subsys_mask & (1 << i)) ||
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if (!(ctx->subsys_mask & (1 << i)) ||
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ss->root == &cgrp_dfl_root)
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continue;
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@ -1166,8 +1161,8 @@ int cgroup1_get_tree(struct fs_context *fc)
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* name matches but sybsys_mask doesn't, we should fail.
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* Remember whether name matched.
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*/
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if (opts.name) {
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if (strcmp(opts.name, root->name))
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if (ctx->name) {
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if (strcmp(ctx->name, root->name))
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continue;
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name_match = true;
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}
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@ -1176,15 +1171,15 @@ int cgroup1_get_tree(struct fs_context *fc)
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* If we asked for subsystems (or explicitly for no
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* subsystems) then they must match.
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*/
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if ((opts.subsys_mask || opts.none) &&
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(opts.subsys_mask != root->subsys_mask)) {
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if ((ctx->subsys_mask || ctx->none) &&
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(ctx->subsys_mask != root->subsys_mask)) {
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if (!name_match)
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continue;
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ret = -EBUSY;
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goto out_unlock;
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}
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if (root->flags ^ opts.flags)
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if (root->flags ^ ctx->flags)
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pr_warn("new mount options do not match the existing superblock, will be ignored\n");
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ret = 0;
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@ -1196,7 +1191,7 @@ int cgroup1_get_tree(struct fs_context *fc)
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* specification is allowed for already existing hierarchies but we
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* can't create new one without subsys specification.
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*/
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if (!opts.subsys_mask && !opts.none) {
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if (!ctx->subsys_mask && !ctx->none) {
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ret = -EINVAL;
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goto out_unlock;
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}
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@ -1213,9 +1208,9 @@ int cgroup1_get_tree(struct fs_context *fc)
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goto out_unlock;
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}
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init_cgroup_root(root, &opts);
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init_cgroup_root(root, ctx);
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ret = cgroup_setup_root(root, opts.subsys_mask);
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ret = cgroup_setup_root(root, ctx->subsys_mask);
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if (ret)
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cgroup_free_root(root);
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@ -1223,14 +1218,10 @@ int cgroup1_get_tree(struct fs_context *fc)
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if (!ret && !percpu_ref_tryget_live(&root->cgrp.self.refcnt)) {
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mutex_unlock(&cgroup_mutex);
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msleep(10);
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ret = restart_syscall();
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goto out_free;
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return restart_syscall();
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}
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mutex_unlock(&cgroup_mutex);
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out_free:
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kfree(opts.release_agent);
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kfree(opts.name);
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if (ret)
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return ret;
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@ -1814,14 +1814,8 @@ static int cgroup_show_options(struct seq_file *seq, struct kernfs_root *kf_root
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static int cgroup_reconfigure(struct fs_context *fc)
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{
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struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
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unsigned int root_flags;
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int ret;
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ret = parse_cgroup_root_flags(ctx->data, &root_flags);
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if (ret)
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return ret;
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apply_cgroup_root_flags(root_flags);
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apply_cgroup_root_flags(ctx->flags);
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return 0;
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}
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@ -1909,7 +1903,7 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
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INIT_WORK(&cgrp->release_agent_work, cgroup1_release_agent);
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}
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void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts)
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void init_cgroup_root(struct cgroup_root *root, struct cgroup_fs_context *ctx)
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{
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struct cgroup *cgrp = &root->cgrp;
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@ -1919,12 +1913,12 @@ void init_cgroup_root(struct cgroup_root *root, struct cgroup_sb_opts *opts)
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init_cgroup_housekeeping(cgrp);
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idr_init(&root->cgroup_idr);
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root->flags = opts->flags;
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if (opts->release_agent)
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strscpy(root->release_agent_path, opts->release_agent, PATH_MAX);
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if (opts->name)
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strscpy(root->name, opts->name, MAX_CGROUP_ROOT_NAMELEN);
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if (opts->cpuset_clone_children)
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root->flags = ctx->flags;
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if (ctx->release_agent)
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strscpy(root->release_agent_path, ctx->release_agent, PATH_MAX);
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if (ctx->name)
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strscpy(root->name, ctx->name, MAX_CGROUP_ROOT_NAMELEN);
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if (ctx->cpuset_clone_children)
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set_bit(CGRP_CPUSET_CLONE_CHILDREN, &root->cgrp.flags);
|
||||
}
|
||||
|
||||
|
|
@ -2075,6 +2069,8 @@ static void cgroup_fs_context_free(struct fs_context *fc)
|
|||
{
|
||||
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
|
||||
|
||||
kfree(ctx->name);
|
||||
kfree(ctx->release_agent);
|
||||
kfree(ctx);
|
||||
}
|
||||
|
||||
|
|
@ -2082,28 +2078,30 @@ static int cgroup_parse_monolithic(struct fs_context *fc, void *data)
|
|||
{
|
||||
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
|
||||
|
||||
ctx->data = data;
|
||||
if (ctx->data)
|
||||
security_sb_eat_lsm_opts(ctx->data, &fc->security);
|
||||
return 0;
|
||||
if (data)
|
||||
security_sb_eat_lsm_opts(data, &fc->security);
|
||||
return parse_cgroup_root_flags(data, &ctx->flags);
|
||||
}
|
||||
|
||||
static int cgroup1_parse_monolithic(struct fs_context *fc, void *data)
|
||||
{
|
||||
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
|
||||
|
||||
if (data)
|
||||
security_sb_eat_lsm_opts(data, &fc->security);
|
||||
return parse_cgroup1_options(data, ctx);
|
||||
}
|
||||
|
||||
static int cgroup_get_tree(struct fs_context *fc)
|
||||
{
|
||||
struct cgroup_namespace *ns = current->nsproxy->cgroup_ns;
|
||||
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
|
||||
unsigned int root_flags;
|
||||
struct dentry *root;
|
||||
int ret;
|
||||
|
||||
/* Check if the caller has permission to mount. */
|
||||
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
ret = parse_cgroup_root_flags(ctx->data, &root_flags);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
cgrp_dfl_visible = true;
|
||||
cgroup_get_live(&cgrp_dfl_root.cgrp);
|
||||
|
||||
|
|
@ -2112,7 +2110,7 @@ static int cgroup_get_tree(struct fs_context *fc)
|
|||
if (IS_ERR(root))
|
||||
return PTR_ERR(root);
|
||||
|
||||
apply_cgroup_root_flags(root_flags);
|
||||
apply_cgroup_root_flags(ctx->flags);
|
||||
fc->root = root;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -2126,7 +2124,7 @@ static const struct fs_context_operations cgroup_fs_context_ops = {
|
|||
|
||||
static const struct fs_context_operations cgroup1_fs_context_ops = {
|
||||
.free = cgroup_fs_context_free,
|
||||
.parse_monolithic = cgroup_parse_monolithic,
|
||||
.parse_monolithic = cgroup1_parse_monolithic,
|
||||
.get_tree = cgroup1_get_tree,
|
||||
.reconfigure = cgroup1_reconfigure,
|
||||
};
|
||||
|
|
@ -5376,11 +5374,11 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss, bool early)
|
|||
*/
|
||||
int __init cgroup_init_early(void)
|
||||
{
|
||||
static struct cgroup_sb_opts __initdata opts;
|
||||
static struct cgroup_fs_context __initdata ctx;
|
||||
struct cgroup_subsys *ss;
|
||||
int i;
|
||||
|
||||
init_cgroup_root(&cgrp_dfl_root, &opts);
|
||||
init_cgroup_root(&cgrp_dfl_root, &ctx);
|
||||
cgrp_dfl_root.cgrp.self.flags |= CSS_NO_REF;
|
||||
|
||||
RCU_INIT_POINTER(init_task.cgroups, &init_css_set);
|
||||
|
|
|
|||
Loading…
Reference in a new issue