include/linux/cgroup-defs.h

   1 /*
   2  * linux/cgroup-defs.h - basic definitions for cgroup
   3  *
   4  * This file provides basic type and interface.  Include this file directly
   5  * only if necessary to avoid cyclic dependencies.
   6  */
   7 #ifndef _LINUX_CGROUP_DEFS_H
   8 #define _LINUX_CGROUP_DEFS_H
   9
  10 #include <linux/limits.h>
  11 #include <linux/list.h>
  12 #include <linux/idr.h>
  13 #include <linux/wait.h>
  14 #include <linux/mutex.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/percpu-refcount.h>
  17 #include <linux/percpu-rwsem.h>
  18 #include <linux/workqueue.h>
  19
  20 #ifdef CONFIG_CGROUPS
  21
  22 struct cgroup;
  23 struct cgroup_root;
  24 struct cgroup_subsys;
  25 struct cgroup_taskset;
  26 struct kernfs_node;
  27 struct kernfs_ops;
  28 struct kernfs_open_file;
  29 struct seq_file;
  30
  31 #define MAX_CGROUP_TYPE_NAMELEN 32
  32 #define MAX_CGROUP_ROOT_NAMELEN 64
  33 #define MAX_CFTYPE_NAME         64
  34
  35 /* define the enumeration of all cgroup subsystems */
  36 #define SUBSYS(_x) _x ## _cgrp_id,
  37 enum cgroup_subsys_id {
  38 #include <linux/cgroup_subsys.h>
  39         CGROUP_SUBSYS_COUNT,
  40 };
  41 #undef SUBSYS
  42
  43 /* bits in struct cgroup_subsys_state flags field */
  44 enum {
  45         CSS_NO_REF      = (1 << 0), /* no reference counting for this css */
  46         CSS_ONLINE      = (1 << 1), /* between ->css_online() and ->css_offline() */
  47         CSS_RELEASED    = (1 << 2), /* refcnt reached zero, released */
  48 };
  49
  50 /* bits in struct cgroup flags field */
  51 enum {
  52         /* Control Group requires release notifications to userspace */
  53         CGRP_NOTIFY_ON_RELEASE,
  54         /*
  55          * Clone the parent's configuration when creating a new child
  56          * cpuset cgroup.  For historical reasons, this option can be
  57          * specified at mount time and thus is implemented here.
  58          */
  59         CGRP_CPUSET_CLONE_CHILDREN,
  60 };
  61
  62 /* cgroup_root->flags */
  63 enum {
  64         CGRP_ROOT_NOPREFIX      = (1 << 1), /* mounted subsystems have no named prefix */
  65         CGRP_ROOT_XATTR         = (1 << 2), /* supports extended attributes */
  66 };
  67
  68 /* cftype->flags */
  69 enum {
  70         CFTYPE_ONLY_ON_ROOT     = (1 << 0),     /* only create on root cgrp */
  71         CFTYPE_NOT_ON_ROOT      = (1 << 1),     /* don't create on root cgrp */
  72         CFTYPE_NO_PREFIX        = (1 << 3),     /* (DON'T USE FOR NEW FILES) no subsys prefix */
  73         CFTYPE_WORLD_WRITABLE   = (1 << 4),     /* (DON'T USE FOR NEW FILES) S_IWUGO */
  74
  75         /* internal flags, do not use outside cgroup core proper */
  76         __CFTYPE_ONLY_ON_DFL    = (1 << 16),    /* only on default hierarchy */
  77         __CFTYPE_NOT_ON_DFL     = (1 << 17),    /* not on default hierarchy */
  78 };
  79
  80 /*
  81  * cgroup_file is the handle for a file instance created in a cgroup which
  82  * is used, for example, to generate file changed notifications.  This can
  83  * be obtained by setting cftype->file_offset.
  84  */
  85 struct cgroup_file {
  86         /* do not access any fields from outside cgroup core */
  87         struct kernfs_node *kn;
  88 };
  89
  90 /*
  91  * Per-subsystem/per-cgroup state maintained by the system.  This is the
  92  * fundamental structural building block that controllers deal with.
  93  *
  94  * Fields marked with "PI:" are public and immutable and may be accessed
  95  * directly without synchronization.
  96  */
  97 struct cgroup_subsys_state {
  98         /* PI: the cgroup that this css is attached to */
  99         struct cgroup *cgroup;
 100
 101         /* PI: the cgroup subsystem that this css is attached to */
 102         struct cgroup_subsys *ss;
 103
 104         /* reference count - access via css_[try]get() and css_put() */
 105         struct percpu_ref refcnt;
 106
 107         /* PI: the parent css */
 108         struct cgroup_subsys_state *parent;
 109
 110         /* siblings list anchored at the parent's ->children */
 111         struct list_head sibling;
 112         struct list_head children;
 113
 114         /*
 115          * PI: Subsys-unique ID.  0 is unused and root is always 1.  The
 116          * matching css can be looked up using css_from_id().
 117          */
 118         int id;
 119
 120         unsigned int flags;
 121
 122         /*
 123          * Monotonically increasing unique serial number which defines a
 124          * uniform order among all csses.  It's guaranteed that all
 125          * ->children lists are in the ascending order of ->serial_nr and
 126          * used to allow interrupting and resuming iterations.
 127          */
 128         u64 serial_nr;
 129
 130         /* percpu_ref killing and RCU release */
 131         struct rcu_head rcu_head;
 132         struct work_struct destroy_work;
 133 };
 134
 135 /*
 136  * A css_set is a structure holding pointers to a set of
 137  * cgroup_subsys_state objects. This saves space in the task struct
 138  * object and speeds up fork()/exit(), since a single inc/dec and a
 139  * list_add()/del() can bump the reference count on the entire cgroup
 140  * set for a task.
 141  */
 142 struct css_set {
 143         /* Reference count */
 144         atomic_t refcount;
 145
 146         /*
 147          * List running through all cgroup groups in the same hash
 148          * slot. Protected by css_set_lock
 149          */
 150         struct hlist_node hlist;
 151
 152         /*
 153          * Lists running through all tasks using this cgroup group.
 154          * mg_tasks lists tasks which belong to this cset but are in the
 155          * process of being migrated out or in.  Protected by
 156          * css_set_rwsem, but, during migration, once tasks are moved to
 157          * mg_tasks, it can be read safely while holding cgroup_mutex.
 158          */
 159         struct list_head tasks;
 160         struct list_head mg_tasks;
 161
 162         /*
 163          * List of cgrp_cset_links pointing at cgroups referenced from this
 164          * css_set.  Protected by css_set_lock.
 165          */
 166         struct list_head cgrp_links;
 167
 168         /* the default cgroup associated with this css_set */
 169         struct cgroup *dfl_cgrp;
 170
 171         /*
 172          * Set of subsystem states, one for each subsystem. This array is
 173          * immutable after creation apart from the init_css_set during
 174          * subsystem registration (at boot time).
 175          */
 176         struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
 177
 178         /*
 179          * List of csets participating in the on-going migration either as
 180          * source or destination.  Protected by cgroup_mutex.
 181          */
 182         struct list_head mg_preload_node;
 183         struct list_head mg_node;
 184
 185         /*
 186          * If this cset is acting as the source of migration the following
 187          * two fields are set.  mg_src_cgrp is the source cgroup of the
 188          * on-going migration and mg_dst_cset is the destination cset the
 189          * target tasks on this cset should be migrated to.  Protected by
 190          * cgroup_mutex.
 191          */
 192         struct cgroup *mg_src_cgrp;
 193         struct css_set *mg_dst_cset;
 194
 195         /*
 196          * On the default hierarhcy, ->subsys[ssid] may point to a css
 197          * attached to an ancestor instead of the cgroup this css_set is
 198          * associated with.  The following node is anchored at
 199          * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
 200          * iterate through all css's attached to a given cgroup.
 201          */
 202         struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
 203
 204         /* all css_task_iters currently walking this cset */
 205         struct list_head task_iters;
 206
 207         /* For RCU-protected deletion */
 208         struct rcu_head rcu_head;
 209 };
 210
 211 struct cgroup {
 212         /* self css with NULL ->ss, points back to this cgroup */
 213         struct cgroup_subsys_state self;
 214
 215         unsigned long flags;            /* "unsigned long" so bitops work */
 216
 217         /*
 218          * idr allocated in-hierarchy ID.
 219          *
 220          * ID 0 is not used, the ID of the root cgroup is always 1, and a
 221          * new cgroup will be assigned with a smallest available ID.
 222          *
 223          * Allocating/Removing ID must be protected by cgroup_mutex.
 224          */
 225         int id;
 226
 227         /*
 228          * The depth this cgroup is at.  The root is at depth zero and each
 229          * step down the hierarchy increments the level.  This along with
 230          * ancestor_ids[] can determine whether a given cgroup is a
 231          * descendant of another without traversing the hierarchy.
 232          */
 233         int level;
 234
 235         /*
 236          * Each non-empty css_set associated with this cgroup contributes
 237          * one to populated_cnt.  All children with non-zero popuplated_cnt
 238          * of their own contribute one.  The count is zero iff there's no
 239          * task in this cgroup or its subtree.
 240          */
 241         int populated_cnt;
 242
 243         struct kernfs_node *kn;         /* cgroup kernfs entry */
 244         struct cgroup_file procs_file;  /* handle for "cgroup.procs" */
 245         struct cgroup_file events_file; /* handle for "cgroup.events" */
 246
 247         /*
 248          * The bitmask of subsystems enabled on the child cgroups.
 249          * ->subtree_control is the one configured through
 250          * "cgroup.subtree_control" while ->child_subsys_mask is the
 251          * effective one which may have more subsystems enabled.
 252          * Controller knobs are made available iff it's enabled in
 253          * ->subtree_control.
 254          */
 255         unsigned int subtree_control;
 256         unsigned int child_subsys_mask;
 257
 258         /* Private pointers for each registered subsystem */
 259         struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];
 260
 261         struct cgroup_root *root;
 262
 263         /*
 264          * List of cgrp_cset_links pointing at css_sets with tasks in this
 265          * cgroup.  Protected by css_set_lock.
 266          */
 267         struct list_head cset_links;
 268
 269         /*
 270          * On the default hierarchy, a css_set for a cgroup with some
 271          * susbsys disabled will point to css's which are associated with
 272          * the closest ancestor which has the subsys enabled.  The
 273          * following lists all css_sets which point to this cgroup's css
 274          * for the given subsystem.
 275          */
 276         struct list_head e_csets[CGROUP_SUBSYS_COUNT];
 277
 278         /*
 279          * list of pidlists, up to two for each namespace (one for procs, one
 280          * for tasks); created on demand.
 281          */
 282         struct list_head pidlists;
 283         struct mutex pidlist_mutex;
 284
 285         /* used to wait for offlining of csses */
 286         wait_queue_head_t offline_waitq;
 287
 288         /* used to schedule release agent */
 289         struct work_struct release_agent_work;
 290
 291         /* ids of the ancestors at each level including self */
 292         int ancestor_ids[];
 293 };
 294
 295 /*
 296  * A cgroup_root represents the root of a cgroup hierarchy, and may be
 297  * associated with a kernfs_root to form an active hierarchy.  This is
 298  * internal to cgroup core.  Don't access directly from controllers.
 299  */
 300 struct cgroup_root {
 301         struct kernfs_root *kf_root;
 302
 303         /* The bitmask of subsystems attached to this hierarchy */
 304         unsigned int subsys_mask;
 305
 306         /* Unique id for this hierarchy. */
 307         int hierarchy_id;
 308
 309         /* The root cgroup.  Root is destroyed on its release. */
 310         struct cgroup cgrp;
 311
 312         /* for cgrp->ancestor_ids[0] */
 313         int cgrp_ancestor_id_storage;
 314
 315         /* Number of cgroups in the hierarchy, used only for /proc/cgroups */
 316         atomic_t nr_cgrps;
 317
 318         /* A list running through the active hierarchies */
 319         struct list_head root_list;
 320
 321         /* Hierarchy-specific flags */
 322         unsigned int flags;
 323
 324         /* IDs for cgroups in this hierarchy */
 325         struct idr cgroup_idr;
 326
 327         /* The path to use for release notifications. */
 328         char release_agent_path[PATH_MAX];
 329
 330         /* The name for this hierarchy - may be empty */
 331         char name[MAX_CGROUP_ROOT_NAMELEN];
 332 };
 333
 334 /*
 335  * struct cftype: handler definitions for cgroup control files
 336  *
 337  * When reading/writing to a file:
 338  *      - the cgroup to use is file->f_path.dentry->d_parent->d_fsdata
 339  *      - the 'cftype' of the file is file->f_path.dentry->d_fsdata
 340  */
 341 struct cftype {
 342         /*
 343          * By convention, the name should begin with the name of the
 344          * subsystem, followed by a period.  Zero length string indicates
 345          * end of cftype array.
 346          */
 347         char name[MAX_CFTYPE_NAME];
 348         unsigned long private;
 349
 350         /*
 351          * The maximum length of string, excluding trailing nul, that can
 352          * be passed to write.  If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
 353          */
 354         size_t max_write_len;
 355
 356         /* CFTYPE_* flags */
 357         unsigned int flags;
 358
 359         /*
 360          * If non-zero, should contain the offset from the start of css to
 361          * a struct cgroup_file field.  cgroup will record the handle of
 362          * the created file into it.  The recorded handle can be used as
 363          * long as the containing css remains accessible.
 364          */
 365         unsigned int file_offset;
 366
 367         /*
 368          * Fields used for internal bookkeeping.  Initialized automatically
 369          * during registration.
 370          */
 371         struct cgroup_subsys *ss;       /* NULL for cgroup core files */
 372         struct list_head node;          /* anchored at ss->cfts */
 373         struct kernfs_ops *kf_ops;
 374
 375         /*
 376          * read_u64() is a shortcut for the common case of returning a
 377          * single integer. Use it in place of read()
 378          */
 379         u64 (*read_u64)(struct cgroup_subsys_state *css, struct cftype *cft);
 380         /*
 381          * read_s64() is a signed version of read_u64()
 382          */
 383         s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);
 384
 385         /* generic seq_file read interface */
 386         int (*seq_show)(struct seq_file *sf, void *v);
 387
 388         /* optional ops, implement all or none */
 389         void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
 390         void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
 391         void (*seq_stop)(struct seq_file *sf, void *v);
 392
 393         /*
 394          * write_u64() is a shortcut for the common case of accepting
 395          * a single integer (as parsed by simple_strtoull) from
 396          * userspace. Use in place of write(); return 0 or error.
 397          */
 398         int (*write_u64)(struct cgroup_subsys_state *css, struct cftype *cft,
 399                          u64 val);
 400         /*
 401          * write_s64() is a signed version of write_u64()
 402          */
 403         int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,
 404                          s64 val);
 405
 406         /*
 407          * write() is the generic write callback which maps directly to
 408          * kernfs write operation and overrides all other operations.
 409          * Maximum write size is determined by ->max_write_len.  Use
 410          * of_css/cft() to access the associated css and cft.
 411          */
 412         ssize_t (*write)(struct kernfs_open_file *of,
 413                          char *buf, size_t nbytes, loff_t off);
 414
 415 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 416         struct lock_class_key   lockdep_key;
 417 #endif
 418 };
 419
 420 /*
 421  * Control Group subsystem type.
 422  * See Documentation/cgroups/cgroups.txt for details
 423  */
 424 struct cgroup_subsys {
 425         struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
 426         int (*css_online)(struct cgroup_subsys_state *css);
 427         void (*css_offline)(struct cgroup_subsys_state *css);
 428         void (*css_released)(struct cgroup_subsys_state *css);
 429         void (*css_free)(struct cgroup_subsys_state *css);
 430         void (*css_reset)(struct cgroup_subsys_state *css);
 431         void (*css_e_css_changed)(struct cgroup_subsys_state *css);
 432
 433         int (*can_attach)(struct cgroup_taskset *tset);
 434         void (*cancel_attach)(struct cgroup_taskset *tset);
 435         void (*attach)(struct cgroup_taskset *tset);
 436         int (*can_fork)(struct task_struct *task);
 437         void (*cancel_fork)(struct task_struct *task);
 438         void (*fork)(struct task_struct *task);
 439         void (*exit)(struct task_struct *task);
 440         void (*free)(struct task_struct *task);
 441         void (*bind)(struct cgroup_subsys_state *root_css);
 442
 443         int early_init;
 444
 445         /*
 446          * If %false, this subsystem is properly hierarchical -
 447          * configuration, resource accounting and restriction on a parent
 448          * cgroup cover those of its children.  If %true, hierarchy support
 449          * is broken in some ways - some subsystems ignore hierarchy
 450          * completely while others are only implemented half-way.
 451          *
 452          * It's now disallowed to create nested cgroups if the subsystem is
 453          * broken and cgroup core will emit a warning message on such
 454          * cases.  Eventually, all subsystems will be made properly
 455          * hierarchical and this will go away.
 456          */
 457         bool broken_hierarchy;
 458         bool warned_broken_hierarchy;
 459
 460         /* the following two fields are initialized automtically during boot */
 461         int id;
 462         const char *name;
 463
 464         /* optional, initialized automatically during boot if not set */
 465         const char *legacy_name;
 466
 467         /* link to parent, protected by cgroup_lock() */
 468         struct cgroup_root *root;
 469
 470         /* idr for css->id */
 471         struct idr css_idr;
 472
 473         /*
 474          * List of cftypes.  Each entry is the first entry of an array
 475          * terminated by zero length name.
 476          */
 477         struct list_head cfts;
 478
 479         /*
 480          * Base cftypes which are automatically registered.  The two can
 481          * point to the same array.
 482          */
 483         struct cftype *dfl_cftypes;     /* for the default hierarchy */
 484         struct cftype *legacy_cftypes;  /* for the legacy hierarchies */
 485
 486         /*
 487          * A subsystem may depend on other subsystems.  When such subsystem
 488          * is enabled on a cgroup, the depended-upon subsystems are enabled
 489          * together if available.  Subsystems enabled due to dependency are
 490          * not visible to userland until explicitly enabled.  The following
 491          * specifies the mask of subsystems that this one depends on.
 492          */
 493         unsigned int depends_on;
 494 };
 495
 496 extern struct percpu_rw_semaphore cgroup_threadgroup_rwsem;
 497
 498 /**
 499  * cgroup_threadgroup_change_begin - threadgroup exclusion for cgroups
 500  * @tsk: target task
 501  *
 502  * Called from threadgroup_change_begin() and allows cgroup operations to
 503  * synchronize against threadgroup changes using a percpu_rw_semaphore.
 504  */
 505 static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk)
 506 {
 507         percpu_down_read(&cgroup_threadgroup_rwsem);
 508 }
 509
 510 /**
 511  * cgroup_threadgroup_change_end - threadgroup exclusion for cgroups
 512  * @tsk: target task
 513  *
 514  * Called from threadgroup_change_end().  Counterpart of
 515  * cgroup_threadcgroup_change_begin().
 516  */
 517 static inline void cgroup_threadgroup_change_end(struct task_struct *tsk)
 518 {
 519         percpu_up_read(&cgroup_threadgroup_rwsem);
 520 }
 521
 522 #else   /* CONFIG_CGROUPS */
 523
 524 #define CGROUP_SUBSYS_COUNT 0
 525
 526 static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk) {}
 527 static inline void cgroup_threadgroup_change_end(struct task_struct *tsk) {}
 528
 529 #endif  /* CONFIG_CGROUPS */
 530
 531 #ifdef CONFIG_SOCK_CGROUP_DATA
 532
 533 /*
 534  * sock_cgroup_data is embedded at sock->sk_cgrp_data and contains
 535  * per-socket cgroup information except for memcg association.
 536  *
 537  * On legacy hierarchies, net_prio and net_cls controllers directly set
 538  * attributes on each sock which can then be tested by the network layer.
 539  * On the default hierarchy, each sock is associated with the cgroup it was
 540  * created in and the networking layer can match the cgroup directly.
 541  *
 542  * To avoid carrying all three cgroup related fields separately in sock,
 543  * sock_cgroup_data overloads (prioidx, classid) and the cgroup pointer.
 544  * On boot, sock_cgroup_data records the cgroup that the sock was created
 545  * in so that cgroup2 matches can be made; however, once either net_prio or
 546  * net_cls starts being used, the area is overriden to carry prioidx and/or
 547  * classid.  The two modes are distinguished by whether the lowest bit is
 548  * set.  Clear bit indicates cgroup pointer while set bit prioidx and
 549  * classid.
 550  *
 551  * While userland may start using net_prio or net_cls at any time, once
 552  * either is used, cgroup2 matching no longer works.  There is no reason to
 553  * mix the two and this is in line with how legacy and v2 compatibility is
 554  * handled.  On mode switch, cgroup references which are already being
 555  * pointed to by socks may be leaked.  While this can be remedied by adding
 556  * synchronization around sock_cgroup_data, given that the number of leaked
 557  * cgroups is bound and highly unlikely to be high, this seems to be the
 558  * better trade-off.
 559  */
 560 struct sock_cgroup_data {
 561         union {
 562 #ifdef __LITTLE_ENDIAN
 563                 struct {
 564                         u8      is_data;
 565                         u8      padding;
 566                         u16     prioidx;
 567                         u32     classid;
 568                 } __packed;
 569 #else
 570                 struct {
 571                         u32     classid;
 572                         u16     prioidx;
 573                         u8      padding;
 574                         u8      is_data;
 575                 } __packed;
 576 #endif
 577                 u64             val;
 578         };
 579 };
 580
 581 /*
 582  * There's a theoretical window where the following accessors race with
 583  * updaters and return part of the previous pointer as the prioidx or
 584  * classid.  Such races are short-lived and the result isn't critical.
 585  */
 586 static inline u16 sock_cgroup_prioidx(struct sock_cgroup_data *skcd)
 587 {
 588         /* fallback to 1 which is always the ID of the root cgroup */
 589         return (skcd->is_data & 1) ? skcd->prioidx : 1;
 590 }
 591
 592 static inline u32 sock_cgroup_classid(struct sock_cgroup_data *skcd)
 593 {
 594         /* fallback to 0 which is the unconfigured default classid */
 595         return (skcd->is_data & 1) ? skcd->classid : 0;
 596 }
 597
 598 /*
 599  * If invoked concurrently, the updaters may clobber each other.  The
 600  * caller is responsible for synchronization.
 601  */
 602 static inline void sock_cgroup_set_prioidx(struct sock_cgroup_data *skcd,
 603                                            u16 prioidx)
 604 {
 605         struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 606
 607         if (sock_cgroup_prioidx(&skcd_buf) == prioidx)
 608                 return;
 609
 610         if (!(skcd_buf.is_data & 1)) {
 611                 skcd_buf.val = 0;
 612                 skcd_buf.is_data = 1;
 613         }
 614
 615         skcd_buf.prioidx = prioidx;
 616         WRITE_ONCE(skcd->val, skcd_buf.val);    /* see sock_cgroup_ptr() */
 617 }
 618
 619 static inline void sock_cgroup_set_classid(struct sock_cgroup_data *skcd,
 620                                            u32 classid)
 621 {
 622         struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 623
 624         if (sock_cgroup_classid(&skcd_buf) == classid)
 625                 return;
 626
 627         if (!(skcd_buf.is_data & 1)) {
 628                 skcd_buf.val = 0;
 629                 skcd_buf.is_data = 1;
 630         }
 631
 632         skcd_buf.classid = classid;
 633         WRITE_ONCE(skcd->val, skcd_buf.val);    /* see sock_cgroup_ptr() */
 634 }
 635
 636 #else   /* CONFIG_SOCK_CGROUP_DATA */
 637
 638 struct sock_cgroup_data {
 639 };
 640
 641 #endif  /* CONFIG_SOCK_CGROUP_DATA */
 642
 643 #endif  /* _LINUX_CGROUP_DEFS_H */