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         /*
 131          * Incremented by online self and children.  Used to guarantee that
 132          * parents are not offlined before their children.
 133          */
 134         atomic_t online_cnt;
 135
 136         /* percpu_ref killing and RCU release */
 137         struct rcu_head rcu_head;
 138         struct work_struct destroy_work;
 139 };
 140
 141 /*
 142  * A css_set is a structure holding pointers to a set of
 143  * cgroup_subsys_state objects. This saves space in the task struct
 144  * object and speeds up fork()/exit(), since a single inc/dec and a
 145  * list_add()/del() can bump the reference count on the entire cgroup
 146  * set for a task.
 147  */
 148 struct css_set {
 149         /* Reference count */
 150         atomic_t refcount;
 151
 152         /*
 153          * List running through all cgroup groups in the same hash
 154          * slot. Protected by css_set_lock
 155          */
 156         struct hlist_node hlist;
 157
 158         /*
 159          * Lists running through all tasks using this cgroup group.
 160          * mg_tasks lists tasks which belong to this cset but are in the
 161          * process of being migrated out or in.  Protected by
 162          * css_set_rwsem, but, during migration, once tasks are moved to
 163          * mg_tasks, it can be read safely while holding cgroup_mutex.
 164          */
 165         struct list_head tasks;
 166         struct list_head mg_tasks;
 167
 168         /*
 169          * List of cgrp_cset_links pointing at cgroups referenced from this
 170          * css_set.  Protected by css_set_lock.
 171          */
 172         struct list_head cgrp_links;
 173
 174         /* the default cgroup associated with this css_set */
 175         struct cgroup *dfl_cgrp;
 176
 177         /*
 178          * Set of subsystem states, one for each subsystem. This array is
 179          * immutable after creation apart from the init_css_set during
 180          * subsystem registration (at boot time).
 181          */
 182         struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
 183
 184         /*
 185          * List of csets participating in the on-going migration either as
 186          * source or destination.  Protected by cgroup_mutex.
 187          */
 188         struct list_head mg_preload_node;
 189         struct list_head mg_node;
 190
 191         /*
 192          * If this cset is acting as the source of migration the following
 193          * two fields are set.  mg_src_cgrp is the source cgroup of the
 194          * on-going migration and mg_dst_cset is the destination cset the
 195          * target tasks on this cset should be migrated to.  Protected by
 196          * cgroup_mutex.
 197          */
 198         struct cgroup *mg_src_cgrp;
 199         struct css_set *mg_dst_cset;
 200
 201         /*
 202          * On the default hierarhcy, ->subsys[ssid] may point to a css
 203          * attached to an ancestor instead of the cgroup this css_set is
 204          * associated with.  The following node is anchored at
 205          * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
 206          * iterate through all css's attached to a given cgroup.
 207          */
 208         struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
 209
 210         /* all css_task_iters currently walking this cset */
 211         struct list_head task_iters;
 212
 213         /* For RCU-protected deletion */
 214         struct rcu_head rcu_head;
 215 };
 216
 217 struct cgroup {
 218         /* self css with NULL ->ss, points back to this cgroup */
 219         struct cgroup_subsys_state self;
 220
 221         unsigned long flags;            /* "unsigned long" so bitops work */
 222
 223         /*
 224          * idr allocated in-hierarchy ID.
 225          *
 226          * ID 0 is not used, the ID of the root cgroup is always 1, and a
 227          * new cgroup will be assigned with a smallest available ID.
 228          *
 229          * Allocating/Removing ID must be protected by cgroup_mutex.
 230          */
 231         int id;
 232
 233         /*
 234          * The depth this cgroup is at.  The root is at depth zero and each
 235          * step down the hierarchy increments the level.  This along with
 236          * ancestor_ids[] can determine whether a given cgroup is a
 237          * descendant of another without traversing the hierarchy.
 238          */
 239         int level;
 240
 241         /*
 242          * Each non-empty css_set associated with this cgroup contributes
 243          * one to populated_cnt.  All children with non-zero popuplated_cnt
 244          * of their own contribute one.  The count is zero iff there's no
 245          * task in this cgroup or its subtree.
 246          */
 247         int populated_cnt;
 248
 249         struct kernfs_node *kn;         /* cgroup kernfs entry */
 250         struct cgroup_file procs_file;  /* handle for "cgroup.procs" */
 251         struct cgroup_file events_file; /* handle for "cgroup.events" */
 252
 253         /*
 254          * The bitmask of subsystems enabled on the child cgroups.
 255          * ->subtree_control is the one configured through
 256          * "cgroup.subtree_control" while ->child_subsys_mask is the
 257          * effective one which may have more subsystems enabled.
 258          * Controller knobs are made available iff it's enabled in
 259          * ->subtree_control.
 260          */
 261         unsigned int subtree_control;
 262         unsigned int child_subsys_mask;
 263
 264         /* Private pointers for each registered subsystem */
 265         struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];
 266
 267         struct cgroup_root *root;
 268
 269         /*
 270          * List of cgrp_cset_links pointing at css_sets with tasks in this
 271          * cgroup.  Protected by css_set_lock.
 272          */
 273         struct list_head cset_links;
 274
 275         /*
 276          * On the default hierarchy, a css_set for a cgroup with some
 277          * susbsys disabled will point to css's which are associated with
 278          * the closest ancestor which has the subsys enabled.  The
 279          * following lists all css_sets which point to this cgroup's css
 280          * for the given subsystem.
 281          */
 282         struct list_head e_csets[CGROUP_SUBSYS_COUNT];
 283
 284         /*
 285          * list of pidlists, up to two for each namespace (one for procs, one
 286          * for tasks); created on demand.
 287          */
 288         struct list_head pidlists;
 289         struct mutex pidlist_mutex;
 290
 291         /* used to wait for offlining of csses */
 292         wait_queue_head_t offline_waitq;
 293
 294         /* used to schedule release agent */
 295         struct work_struct release_agent_work;
 296
 297         /* ids of the ancestors at each level including self */
 298         int ancestor_ids[];
 299 };
 300
 301 /*
 302  * A cgroup_root represents the root of a cgroup hierarchy, and may be
 303  * associated with a kernfs_root to form an active hierarchy.  This is
 304  * internal to cgroup core.  Don't access directly from controllers.
 305  */
 306 struct cgroup_root {
 307         struct kernfs_root *kf_root;
 308
 309         /* The bitmask of subsystems attached to this hierarchy */
 310         unsigned int subsys_mask;
 311
 312         /* Unique id for this hierarchy. */
 313         int hierarchy_id;
 314
 315         /* The root cgroup.  Root is destroyed on its release. */
 316         struct cgroup cgrp;
 317
 318         /* for cgrp->ancestor_ids[0] */
 319         int cgrp_ancestor_id_storage;
 320
 321         /* Number of cgroups in the hierarchy, used only for /proc/cgroups */
 322         atomic_t nr_cgrps;
 323
 324         /* A list running through the active hierarchies */
 325         struct list_head root_list;
 326
 327         /* Hierarchy-specific flags */
 328         unsigned int flags;
 329
 330         /* IDs for cgroups in this hierarchy */
 331         struct idr cgroup_idr;
 332
 333         /* The path to use for release notifications. */
 334         char release_agent_path[PATH_MAX];
 335
 336         /* The name for this hierarchy - may be empty */
 337         char name[MAX_CGROUP_ROOT_NAMELEN];
 338 };
 339
 340 /*
 341  * struct cftype: handler definitions for cgroup control files
 342  *
 343  * When reading/writing to a file:
 344  *      - the cgroup to use is file->f_path.dentry->d_parent->d_fsdata
 345  *      - the 'cftype' of the file is file->f_path.dentry->d_fsdata
 346  */
 347 struct cftype {
 348         /*
 349          * By convention, the name should begin with the name of the
 350          * subsystem, followed by a period.  Zero length string indicates
 351          * end of cftype array.
 352          */
 353         char name[MAX_CFTYPE_NAME];
 354         unsigned long private;
 355
 356         /*
 357          * The maximum length of string, excluding trailing nul, that can
 358          * be passed to write.  If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
 359          */
 360         size_t max_write_len;
 361
 362         /* CFTYPE_* flags */
 363         unsigned int flags;
 364
 365         /*
 366          * If non-zero, should contain the offset from the start of css to
 367          * a struct cgroup_file field.  cgroup will record the handle of
 368          * the created file into it.  The recorded handle can be used as
 369          * long as the containing css remains accessible.
 370          */
 371         unsigned int file_offset;
 372
 373         /*
 374          * Fields used for internal bookkeeping.  Initialized automatically
 375          * during registration.
 376          */
 377         struct cgroup_subsys *ss;       /* NULL for cgroup core files */
 378         struct list_head node;          /* anchored at ss->cfts */
 379         struct kernfs_ops *kf_ops;
 380
 381         /*
 382          * read_u64() is a shortcut for the common case of returning a
 383          * single integer. Use it in place of read()
 384          */
 385         u64 (*read_u64)(struct cgroup_subsys_state *css, struct cftype *cft);
 386         /*
 387          * read_s64() is a signed version of read_u64()
 388          */
 389         s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);
 390
 391         /* generic seq_file read interface */
 392         int (*seq_show)(struct seq_file *sf, void *v);
 393
 394         /* optional ops, implement all or none */
 395         void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
 396         void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
 397         void (*seq_stop)(struct seq_file *sf, void *v);
 398
 399         /*
 400          * write_u64() is a shortcut for the common case of accepting
 401          * a single integer (as parsed by simple_strtoull) from
 402          * userspace. Use in place of write(); return 0 or error.
 403          */
 404         int (*write_u64)(struct cgroup_subsys_state *css, struct cftype *cft,
 405                          u64 val);
 406         /*
 407          * write_s64() is a signed version of write_u64()
 408          */
 409         int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,
 410                          s64 val);
 411
 412         /*
 413          * write() is the generic write callback which maps directly to
 414          * kernfs write operation and overrides all other operations.
 415          * Maximum write size is determined by ->max_write_len.  Use
 416          * of_css/cft() to access the associated css and cft.
 417          */
 418         ssize_t (*write)(struct kernfs_open_file *of,
 419                          char *buf, size_t nbytes, loff_t off);
 420
 421 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 422         struct lock_class_key   lockdep_key;
 423 #endif
 424 };
 425
 426 /*
 427  * Control Group subsystem type.
 428  * See Documentation/cgroups/cgroups.txt for details
 429  */
 430 struct cgroup_subsys {
 431         struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
 432         int (*css_online)(struct cgroup_subsys_state *css);
 433         void (*css_offline)(struct cgroup_subsys_state *css);
 434         void (*css_released)(struct cgroup_subsys_state *css);
 435         void (*css_free)(struct cgroup_subsys_state *css);
 436         void (*css_reset)(struct cgroup_subsys_state *css);
 437         void (*css_e_css_changed)(struct cgroup_subsys_state *css);
 438
 439         int (*can_attach)(struct cgroup_taskset *tset);
 440         void (*cancel_attach)(struct cgroup_taskset *tset);
 441         void (*attach)(struct cgroup_taskset *tset);
 442         int (*can_fork)(struct task_struct *task);
 443         void (*cancel_fork)(struct task_struct *task);
 444         void (*fork)(struct task_struct *task);
 445         void (*exit)(struct task_struct *task);
 446         void (*free)(struct task_struct *task);
 447         void (*bind)(struct cgroup_subsys_state *root_css);
 448
 449         int early_init;
 450
 451         /*
 452          * If %false, this subsystem is properly hierarchical -
 453          * configuration, resource accounting and restriction on a parent
 454          * cgroup cover those of its children.  If %true, hierarchy support
 455          * is broken in some ways - some subsystems ignore hierarchy
 456          * completely while others are only implemented half-way.
 457          *
 458          * It's now disallowed to create nested cgroups if the subsystem is
 459          * broken and cgroup core will emit a warning message on such
 460          * cases.  Eventually, all subsystems will be made properly
 461          * hierarchical and this will go away.
 462          */
 463         bool broken_hierarchy;
 464         bool warned_broken_hierarchy;
 465
 466         /* the following two fields are initialized automtically during boot */
 467         int id;
 468         const char *name;
 469
 470         /* optional, initialized automatically during boot if not set */
 471         const char *legacy_name;
 472
 473         /* link to parent, protected by cgroup_lock() */
 474         struct cgroup_root *root;
 475
 476         /* idr for css->id */
 477         struct idr css_idr;
 478
 479         /*
 480          * List of cftypes.  Each entry is the first entry of an array
 481          * terminated by zero length name.
 482          */
 483         struct list_head cfts;
 484
 485         /*
 486          * Base cftypes which are automatically registered.  The two can
 487          * point to the same array.
 488          */
 489         struct cftype *dfl_cftypes;     /* for the default hierarchy */
 490         struct cftype *legacy_cftypes;  /* for the legacy hierarchies */
 491
 492         /*
 493          * A subsystem may depend on other subsystems.  When such subsystem
 494          * is enabled on a cgroup, the depended-upon subsystems are enabled
 495          * together if available.  Subsystems enabled due to dependency are
 496          * not visible to userland until explicitly enabled.  The following
 497          * specifies the mask of subsystems that this one depends on.
 498          */
 499         unsigned int depends_on;
 500 };
 501
 502 extern struct percpu_rw_semaphore cgroup_threadgroup_rwsem;
 503
 504 /**
 505  * cgroup_threadgroup_change_begin - threadgroup exclusion for cgroups
 506  * @tsk: target task
 507  *
 508  * Called from threadgroup_change_begin() and allows cgroup operations to
 509  * synchronize against threadgroup changes using a percpu_rw_semaphore.
 510  */
 511 static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk)
 512 {
 513         percpu_down_read(&cgroup_threadgroup_rwsem);
 514 }
 515
 516 /**
 517  * cgroup_threadgroup_change_end - threadgroup exclusion for cgroups
 518  * @tsk: target task
 519  *
 520  * Called from threadgroup_change_end().  Counterpart of
 521  * cgroup_threadcgroup_change_begin().
 522  */
 523 static inline void cgroup_threadgroup_change_end(struct task_struct *tsk)
 524 {
 525         percpu_up_read(&cgroup_threadgroup_rwsem);
 526 }
 527
 528 #else   /* CONFIG_CGROUPS */
 529
 530 #define CGROUP_SUBSYS_COUNT 0
 531
 532 static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk) {}
 533 static inline void cgroup_threadgroup_change_end(struct task_struct *tsk) {}
 534
 535 #endif  /* CONFIG_CGROUPS */
 536
 537 #ifdef CONFIG_SOCK_CGROUP_DATA
 538
 539 /*
 540  * sock_cgroup_data is embedded at sock->sk_cgrp_data and contains
 541  * per-socket cgroup information except for memcg association.
 542  *
 543  * On legacy hierarchies, net_prio and net_cls controllers directly set
 544  * attributes on each sock which can then be tested by the network layer.
 545  * On the default hierarchy, each sock is associated with the cgroup it was
 546  * created in and the networking layer can match the cgroup directly.
 547  *
 548  * To avoid carrying all three cgroup related fields separately in sock,
 549  * sock_cgroup_data overloads (prioidx, classid) and the cgroup pointer.
 550  * On boot, sock_cgroup_data records the cgroup that the sock was created
 551  * in so that cgroup2 matches can be made; however, once either net_prio or
 552  * net_cls starts being used, the area is overriden to carry prioidx and/or
 553  * classid.  The two modes are distinguished by whether the lowest bit is
 554  * set.  Clear bit indicates cgroup pointer while set bit prioidx and
 555  * classid.
 556  *
 557  * While userland may start using net_prio or net_cls at any time, once
 558  * either is used, cgroup2 matching no longer works.  There is no reason to
 559  * mix the two and this is in line with how legacy and v2 compatibility is
 560  * handled.  On mode switch, cgroup references which are already being
 561  * pointed to by socks may be leaked.  While this can be remedied by adding
 562  * synchronization around sock_cgroup_data, given that the number of leaked
 563  * cgroups is bound and highly unlikely to be high, this seems to be the
 564  * better trade-off.
 565  */
 566 struct sock_cgroup_data {
 567         union {
 568 #ifdef __LITTLE_ENDIAN
 569                 struct {
 570                         u8      is_data;
 571                         u8      padding;
 572                         u16     prioidx;
 573                         u32     classid;
 574                 } __packed;
 575 #else
 576                 struct {
 577                         u32     classid;
 578                         u16     prioidx;
 579                         u8      padding;
 580                         u8      is_data;
 581                 } __packed;
 582 #endif
 583                 u64             val;
 584         };
 585 };
 586
 587 /*
 588  * There's a theoretical window where the following accessors race with
 589  * updaters and return part of the previous pointer as the prioidx or
 590  * classid.  Such races are short-lived and the result isn't critical.
 591  */
 592 static inline u16 sock_cgroup_prioidx(struct sock_cgroup_data *skcd)
 593 {
 594         /* fallback to 1 which is always the ID of the root cgroup */
 595         return (skcd->is_data & 1) ? skcd->prioidx : 1;
 596 }
 597
 598 static inline u32 sock_cgroup_classid(struct sock_cgroup_data *skcd)
 599 {
 600         /* fallback to 0 which is the unconfigured default classid */
 601         return (skcd->is_data & 1) ? skcd->classid : 0;
 602 }
 603
 604 /*
 605  * If invoked concurrently, the updaters may clobber each other.  The
 606  * caller is responsible for synchronization.
 607  */
 608 static inline void sock_cgroup_set_prioidx(struct sock_cgroup_data *skcd,
 609                                            u16 prioidx)
 610 {
 611         struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 612
 613         if (sock_cgroup_prioidx(&skcd_buf) == prioidx)
 614                 return;
 615
 616         if (!(skcd_buf.is_data & 1)) {
 617                 skcd_buf.val = 0;
 618                 skcd_buf.is_data = 1;
 619         }
 620
 621         skcd_buf.prioidx = prioidx;
 622         WRITE_ONCE(skcd->val, skcd_buf.val);    /* see sock_cgroup_ptr() */
 623 }
 624
 625 static inline void sock_cgroup_set_classid(struct sock_cgroup_data *skcd,
 626                                            u32 classid)
 627 {
 628         struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 629
 630         if (sock_cgroup_classid(&skcd_buf) == classid)
 631                 return;
 632
 633         if (!(skcd_buf.is_data & 1)) {
 634                 skcd_buf.val = 0;
 635                 skcd_buf.is_data = 1;
 636         }
 637
 638         skcd_buf.classid = classid;
 639         WRITE_ONCE(skcd->val, skcd_buf.val);    /* see sock_cgroup_ptr() */
 640 }
 641
 642 #else   /* CONFIG_SOCK_CGROUP_DATA */
 643
 644 struct sock_cgroup_data {
 645 };
 646
 647 #endif  /* CONFIG_SOCK_CGROUP_DATA */
 648
 649 #endif  /* _LINUX_CGROUP_DEFS_H */