1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/cgroup-defs.h - basic definitions for cgroup
5 * This file provides basic type and interface. Include this file directly
6 * only if necessary to avoid cyclic dependencies.
8 #ifndef _LINUX_CGROUP_DEFS_H
9 #define _LINUX_CGROUP_DEFS_H
11 #include <linux/limits.h>
12 #include <linux/list.h>
13 #include <linux/idr.h>
14 #include <linux/wait.h>
15 #include <linux/mutex.h>
16 #include <linux/rcupdate.h>
17 #include <linux/refcount.h>
18 #include <linux/percpu-refcount.h>
19 #include <linux/percpu-rwsem.h>
20 #include <linux/u64_stats_sync.h>
21 #include <linux/workqueue.h>
22 #include <linux/bpf-cgroup.h>
29 struct cgroup_taskset
;
32 struct kernfs_open_file
;
35 #define MAX_CGROUP_TYPE_NAMELEN 32
36 #define MAX_CGROUP_ROOT_NAMELEN 64
37 #define MAX_CFTYPE_NAME 64
39 /* define the enumeration of all cgroup subsystems */
40 #define SUBSYS(_x) _x ## _cgrp_id,
41 enum cgroup_subsys_id
{
42 #include <linux/cgroup_subsys.h>
47 /* bits in struct cgroup_subsys_state flags field */
49 CSS_NO_REF
= (1 << 0), /* no reference counting for this css */
50 CSS_ONLINE
= (1 << 1), /* between ->css_online() and ->css_offline() */
51 CSS_RELEASED
= (1 << 2), /* refcnt reached zero, released */
52 CSS_VISIBLE
= (1 << 3), /* css is visible to userland */
53 CSS_DYING
= (1 << 4), /* css is dying */
56 /* bits in struct cgroup flags field */
58 /* Control Group requires release notifications to userspace */
59 CGRP_NOTIFY_ON_RELEASE
,
61 * Clone the parent's configuration when creating a new child
62 * cpuset cgroup. For historical reasons, this option can be
63 * specified at mount time and thus is implemented here.
65 CGRP_CPUSET_CLONE_CHILDREN
,
68 /* cgroup_root->flags */
70 CGRP_ROOT_NOPREFIX
= (1 << 1), /* mounted subsystems have no named prefix */
71 CGRP_ROOT_XATTR
= (1 << 2), /* supports extended attributes */
74 * Consider namespaces as delegation boundaries. If this flag is
75 * set, controller specific interface files in a namespace root
76 * aren't writeable from inside the namespace.
78 CGRP_ROOT_NS_DELEGATE
= (1 << 3),
81 * Enable cpuset controller in v1 cgroup to use v2 behavior.
83 CGRP_ROOT_CPUSET_V2_MODE
= (1 << 4),
88 CFTYPE_ONLY_ON_ROOT
= (1 << 0), /* only create on root cgrp */
89 CFTYPE_NOT_ON_ROOT
= (1 << 1), /* don't create on root cgrp */
90 CFTYPE_NS_DELEGATABLE
= (1 << 2), /* writeable beyond delegation boundaries */
92 CFTYPE_NO_PREFIX
= (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
93 CFTYPE_WORLD_WRITABLE
= (1 << 4), /* (DON'T USE FOR NEW FILES) S_IWUGO */
95 /* internal flags, do not use outside cgroup core proper */
96 __CFTYPE_ONLY_ON_DFL
= (1 << 16), /* only on default hierarchy */
97 __CFTYPE_NOT_ON_DFL
= (1 << 17), /* not on default hierarchy */
101 * cgroup_file is the handle for a file instance created in a cgroup which
102 * is used, for example, to generate file changed notifications. This can
103 * be obtained by setting cftype->file_offset.
106 /* do not access any fields from outside cgroup core */
107 struct kernfs_node
*kn
;
111 * Per-subsystem/per-cgroup state maintained by the system. This is the
112 * fundamental structural building block that controllers deal with.
114 * Fields marked with "PI:" are public and immutable and may be accessed
115 * directly without synchronization.
117 struct cgroup_subsys_state
{
118 /* PI: the cgroup that this css is attached to */
119 struct cgroup
*cgroup
;
121 /* PI: the cgroup subsystem that this css is attached to */
122 struct cgroup_subsys
*ss
;
124 /* reference count - access via css_[try]get() and css_put() */
125 struct percpu_ref refcnt
;
127 /* siblings list anchored at the parent's ->children */
128 struct list_head sibling
;
129 struct list_head children
;
132 * PI: Subsys-unique ID. 0 is unused and root is always 1. The
133 * matching css can be looked up using css_from_id().
140 * Monotonically increasing unique serial number which defines a
141 * uniform order among all csses. It's guaranteed that all
142 * ->children lists are in the ascending order of ->serial_nr and
143 * used to allow interrupting and resuming iterations.
148 * Incremented by online self and children. Used to guarantee that
149 * parents are not offlined before their children.
153 /* percpu_ref killing and RCU release */
154 struct rcu_head rcu_head
;
155 struct work_struct destroy_work
;
158 * PI: the parent css. Placed here for cache proximity to following
159 * fields of the containing structure.
161 struct cgroup_subsys_state
*parent
;
165 * A css_set is a structure holding pointers to a set of
166 * cgroup_subsys_state objects. This saves space in the task struct
167 * object and speeds up fork()/exit(), since a single inc/dec and a
168 * list_add()/del() can bump the reference count on the entire cgroup
173 * Set of subsystem states, one for each subsystem. This array is
174 * immutable after creation apart from the init_css_set during
175 * subsystem registration (at boot time).
177 struct cgroup_subsys_state
*subsys
[CGROUP_SUBSYS_COUNT
];
179 /* reference count */
183 * For a domain cgroup, the following points to self. If threaded,
184 * to the matching cset of the nearest domain ancestor. The
185 * dom_cset provides access to the domain cgroup and its csses to
186 * which domain level resource consumptions should be charged.
188 struct css_set
*dom_cset
;
190 /* the default cgroup associated with this css_set */
191 struct cgroup
*dfl_cgrp
;
193 /* internal task count, protected by css_set_lock */
197 * Lists running through all tasks using this cgroup group.
198 * mg_tasks lists tasks which belong to this cset but are in the
199 * process of being migrated out or in. Protected by
200 * css_set_rwsem, but, during migration, once tasks are moved to
201 * mg_tasks, it can be read safely while holding cgroup_mutex.
203 struct list_head tasks
;
204 struct list_head mg_tasks
;
205 struct list_head dying_tasks
;
207 /* all css_task_iters currently walking this cset */
208 struct list_head task_iters
;
211 * On the default hierarhcy, ->subsys[ssid] may point to a css
212 * attached to an ancestor instead of the cgroup this css_set is
213 * associated with. The following node is anchored at
214 * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
215 * iterate through all css's attached to a given cgroup.
217 struct list_head e_cset_node
[CGROUP_SUBSYS_COUNT
];
219 /* all threaded csets whose ->dom_cset points to this cset */
220 struct list_head threaded_csets
;
221 struct list_head threaded_csets_node
;
224 * List running through all cgroup groups in the same hash
225 * slot. Protected by css_set_lock
227 struct hlist_node hlist
;
230 * List of cgrp_cset_links pointing at cgroups referenced from this
231 * css_set. Protected by css_set_lock.
233 struct list_head cgrp_links
;
236 * List of csets participating in the on-going migration either as
237 * source or destination. Protected by cgroup_mutex.
239 struct list_head mg_preload_node
;
240 struct list_head mg_node
;
243 * If this cset is acting as the source of migration the following
244 * two fields are set. mg_src_cgrp and mg_dst_cgrp are
245 * respectively the source and destination cgroups of the on-going
246 * migration. mg_dst_cset is the destination cset the target tasks
247 * on this cset should be migrated to. Protected by cgroup_mutex.
249 struct cgroup
*mg_src_cgrp
;
250 struct cgroup
*mg_dst_cgrp
;
251 struct css_set
*mg_dst_cset
;
253 /* dead and being drained, ignore for migration */
256 /* For RCU-protected deletion */
257 struct rcu_head rcu_head
;
261 * cgroup basic resource usage statistics. Accounting is done per-cpu in
262 * cgroup_cpu_stat which is then lazily propagated up the hierarchy on
265 * When a stat gets updated, the cgroup_cpu_stat and its ancestors are
266 * linked into the updated tree. On the following read, propagation only
267 * considers and consumes the updated tree. This makes reading O(the
268 * number of descendants which have been active since last read) instead of
269 * O(the total number of descendants).
271 * This is important because there can be a lot of (draining) cgroups which
272 * aren't active and stat may be read frequently. The combination can
273 * become very expensive. By propagating selectively, increasing reading
274 * frequency decreases the cost of each read.
276 struct cgroup_cpu_stat
{
278 * ->sync protects all the current counters. These are the only
279 * fields which get updated in the hot path.
281 struct u64_stats_sync sync
;
282 struct task_cputime cputime
;
285 * Snapshots at the last reading. These are used to calculate the
286 * deltas to propagate to the global counters.
288 struct task_cputime last_cputime
;
291 * Child cgroups with stat updates on this cpu since the last read
292 * are linked on the parent's ->updated_children through
295 * In addition to being more compact, singly-linked list pointing
296 * to the cgroup makes it unnecessary for each per-cpu struct to
297 * point back to the associated cgroup.
299 * Protected by per-cpu cgroup_cpu_stat_lock.
301 struct cgroup
*updated_children
; /* terminated by self cgroup */
302 struct cgroup
*updated_next
; /* NULL iff not on the list */
306 /* per-cpu statistics are collected into the folowing global counters */
307 struct task_cputime cputime
;
308 struct prev_cputime prev_cputime
;
312 /* self css with NULL ->ss, points back to this cgroup */
313 struct cgroup_subsys_state self
;
315 unsigned long flags
; /* "unsigned long" so bitops work */
318 * idr allocated in-hierarchy ID.
320 * ID 0 is not used, the ID of the root cgroup is always 1, and a
321 * new cgroup will be assigned with a smallest available ID.
323 * Allocating/Removing ID must be protected by cgroup_mutex.
328 * The depth this cgroup is at. The root is at depth zero and each
329 * step down the hierarchy increments the level. This along with
330 * ancestor_ids[] can determine whether a given cgroup is a
331 * descendant of another without traversing the hierarchy.
335 /* Maximum allowed descent tree depth */
339 * Keep track of total numbers of visible and dying descent cgroups.
340 * Dying cgroups are cgroups which were deleted by a user,
341 * but are still existing because someone else is holding a reference.
342 * max_descendants is a maximum allowed number of descent cgroups.
344 * nr_descendants and nr_dying_descendants are protected
345 * by cgroup_mutex and css_set_lock. It's fine to read them holding
346 * any of cgroup_mutex and css_set_lock; for writing both locks
350 int nr_dying_descendants
;
354 * Each non-empty css_set associated with this cgroup contributes
355 * one to nr_populated_csets. The counter is zero iff this cgroup
356 * doesn't have any tasks.
358 * All children which have non-zero nr_populated_csets and/or
359 * nr_populated_children of their own contribute one to either
360 * nr_populated_domain_children or nr_populated_threaded_children
361 * depending on their type. Each counter is zero iff all cgroups
362 * of the type in the subtree proper don't have any tasks.
364 int nr_populated_csets
;
365 int nr_populated_domain_children
;
366 int nr_populated_threaded_children
;
368 int nr_threaded_children
; /* # of live threaded child cgroups */
370 struct kernfs_node
*kn
; /* cgroup kernfs entry */
371 struct cgroup_file procs_file
; /* handle for "cgroup.procs" */
372 struct cgroup_file events_file
; /* handle for "cgroup.events" */
375 * The bitmask of subsystems enabled on the child cgroups.
376 * ->subtree_control is the one configured through
377 * "cgroup.subtree_control" while ->child_ss_mask is the effective
378 * one which may have more subsystems enabled. Controller knobs
379 * are made available iff it's enabled in ->subtree_control.
383 u16 old_subtree_control
;
384 u16 old_subtree_ss_mask
;
386 /* Private pointers for each registered subsystem */
387 struct cgroup_subsys_state __rcu
*subsys
[CGROUP_SUBSYS_COUNT
];
389 struct cgroup_root
*root
;
392 * List of cgrp_cset_links pointing at css_sets with tasks in this
393 * cgroup. Protected by css_set_lock.
395 struct list_head cset_links
;
398 * On the default hierarchy, a css_set for a cgroup with some
399 * susbsys disabled will point to css's which are associated with
400 * the closest ancestor which has the subsys enabled. The
401 * following lists all css_sets which point to this cgroup's css
402 * for the given subsystem.
404 struct list_head e_csets
[CGROUP_SUBSYS_COUNT
];
407 * If !threaded, self. If threaded, it points to the nearest
408 * domain ancestor. Inside a threaded subtree, cgroups are exempt
409 * from process granularity and no-internal-task constraint.
410 * Domain level resource consumptions which aren't tied to a
411 * specific task are charged to the dom_cgrp.
413 struct cgroup
*dom_cgrp
;
414 struct cgroup
*old_dom_cgrp
; /* used while enabling threaded */
416 /* cgroup basic resource statistics */
417 struct cgroup_cpu_stat __percpu
*cpu_stat
;
418 struct cgroup_stat pending_stat
; /* pending from children */
419 struct cgroup_stat stat
;
422 * list of pidlists, up to two for each namespace (one for procs, one
423 * for tasks); created on demand.
425 struct list_head pidlists
;
426 struct mutex pidlist_mutex
;
428 /* used to wait for offlining of csses */
429 wait_queue_head_t offline_waitq
;
431 /* used to schedule release agent */
432 struct work_struct release_agent_work
;
434 /* used to store eBPF programs */
435 struct cgroup_bpf bpf
;
437 /* ids of the ancestors at each level including self */
442 * A cgroup_root represents the root of a cgroup hierarchy, and may be
443 * associated with a kernfs_root to form an active hierarchy. This is
444 * internal to cgroup core. Don't access directly from controllers.
447 struct kernfs_root
*kf_root
;
449 /* The bitmask of subsystems attached to this hierarchy */
450 unsigned int subsys_mask
;
452 /* Unique id for this hierarchy. */
455 /* The root cgroup. Root is destroyed on its release. */
458 /* for cgrp->ancestor_ids[0] */
459 int cgrp_ancestor_id_storage
;
461 /* Number of cgroups in the hierarchy, used only for /proc/cgroups */
464 /* A list running through the active hierarchies */
465 struct list_head root_list
;
467 /* Hierarchy-specific flags */
470 /* IDs for cgroups in this hierarchy */
471 struct idr cgroup_idr
;
473 /* The path to use for release notifications. */
474 char release_agent_path
[PATH_MAX
];
476 /* The name for this hierarchy - may be empty */
477 char name
[MAX_CGROUP_ROOT_NAMELEN
];
481 * struct cftype: handler definitions for cgroup control files
483 * When reading/writing to a file:
484 * - the cgroup to use is file->f_path.dentry->d_parent->d_fsdata
485 * - the 'cftype' of the file is file->f_path.dentry->d_fsdata
489 * By convention, the name should begin with the name of the
490 * subsystem, followed by a period. Zero length string indicates
491 * end of cftype array.
493 char name
[MAX_CFTYPE_NAME
];
494 unsigned long private;
497 * The maximum length of string, excluding trailing nul, that can
498 * be passed to write. If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
500 size_t max_write_len
;
506 * If non-zero, should contain the offset from the start of css to
507 * a struct cgroup_file field. cgroup will record the handle of
508 * the created file into it. The recorded handle can be used as
509 * long as the containing css remains accessible.
511 unsigned int file_offset
;
514 * Fields used for internal bookkeeping. Initialized automatically
515 * during registration.
517 struct cgroup_subsys
*ss
; /* NULL for cgroup core files */
518 struct list_head node
; /* anchored at ss->cfts */
519 struct kernfs_ops
*kf_ops
;
521 int (*open
)(struct kernfs_open_file
*of
);
522 void (*release
)(struct kernfs_open_file
*of
);
525 * read_u64() is a shortcut for the common case of returning a
526 * single integer. Use it in place of read()
528 u64 (*read_u64
)(struct cgroup_subsys_state
*css
, struct cftype
*cft
);
530 * read_s64() is a signed version of read_u64()
532 s64 (*read_s64
)(struct cgroup_subsys_state
*css
, struct cftype
*cft
);
534 /* generic seq_file read interface */
535 int (*seq_show
)(struct seq_file
*sf
, void *v
);
537 /* optional ops, implement all or none */
538 void *(*seq_start
)(struct seq_file
*sf
, loff_t
*ppos
);
539 void *(*seq_next
)(struct seq_file
*sf
, void *v
, loff_t
*ppos
);
540 void (*seq_stop
)(struct seq_file
*sf
, void *v
);
543 * write_u64() is a shortcut for the common case of accepting
544 * a single integer (as parsed by simple_strtoull) from
545 * userspace. Use in place of write(); return 0 or error.
547 int (*write_u64
)(struct cgroup_subsys_state
*css
, struct cftype
*cft
,
550 * write_s64() is a signed version of write_u64()
552 int (*write_s64
)(struct cgroup_subsys_state
*css
, struct cftype
*cft
,
556 * write() is the generic write callback which maps directly to
557 * kernfs write operation and overrides all other operations.
558 * Maximum write size is determined by ->max_write_len. Use
559 * of_css/cft() to access the associated css and cft.
561 ssize_t (*write
)(struct kernfs_open_file
*of
,
562 char *buf
, size_t nbytes
, loff_t off
);
564 #ifdef CONFIG_DEBUG_LOCK_ALLOC
565 struct lock_class_key lockdep_key
;
570 * Control Group subsystem type.
571 * See Documentation/cgroups/cgroups.txt for details
573 struct cgroup_subsys
{
574 struct cgroup_subsys_state
*(*css_alloc
)(struct cgroup_subsys_state
*parent_css
);
575 int (*css_online
)(struct cgroup_subsys_state
*css
);
576 void (*css_offline
)(struct cgroup_subsys_state
*css
);
577 void (*css_released
)(struct cgroup_subsys_state
*css
);
578 void (*css_free
)(struct cgroup_subsys_state
*css
);
579 void (*css_reset
)(struct cgroup_subsys_state
*css
);
580 int (*css_extra_stat_show
)(struct seq_file
*seq
,
581 struct cgroup_subsys_state
*css
);
583 int (*can_attach
)(struct cgroup_taskset
*tset
);
584 void (*cancel_attach
)(struct cgroup_taskset
*tset
);
585 void (*attach
)(struct cgroup_taskset
*tset
);
586 void (*post_attach
)(void);
587 int (*can_fork
)(struct task_struct
*task
);
588 void (*cancel_fork
)(struct task_struct
*task
);
589 void (*fork
)(struct task_struct
*task
);
590 void (*exit
)(struct task_struct
*task
);
591 void (*release
)(struct task_struct
*task
);
592 void (*bind
)(struct cgroup_subsys_state
*root_css
);
597 * If %true, the controller, on the default hierarchy, doesn't show
598 * up in "cgroup.controllers" or "cgroup.subtree_control", is
599 * implicitly enabled on all cgroups on the default hierarchy, and
600 * bypasses the "no internal process" constraint. This is for
601 * utility type controllers which is transparent to userland.
603 * An implicit controller can be stolen from the default hierarchy
604 * anytime and thus must be okay with offline csses from previous
605 * hierarchies coexisting with csses for the current one.
607 bool implicit_on_dfl
:1;
610 * If %true, the controller, supports threaded mode on the default
611 * hierarchy. In a threaded subtree, both process granularity and
612 * no-internal-process constraint are ignored and a threaded
613 * controllers should be able to handle that.
615 * Note that as an implicit controller is automatically enabled on
616 * all cgroups on the default hierarchy, it should also be
617 * threaded. implicit && !threaded is not supported.
622 * If %false, this subsystem is properly hierarchical -
623 * configuration, resource accounting and restriction on a parent
624 * cgroup cover those of its children. If %true, hierarchy support
625 * is broken in some ways - some subsystems ignore hierarchy
626 * completely while others are only implemented half-way.
628 * It's now disallowed to create nested cgroups if the subsystem is
629 * broken and cgroup core will emit a warning message on such
630 * cases. Eventually, all subsystems will be made properly
631 * hierarchical and this will go away.
633 bool broken_hierarchy
:1;
634 bool warned_broken_hierarchy
:1;
636 /* the following two fields are initialized automtically during boot */
640 /* optional, initialized automatically during boot if not set */
641 const char *legacy_name
;
643 /* link to parent, protected by cgroup_lock() */
644 struct cgroup_root
*root
;
646 /* idr for css->id */
650 * List of cftypes. Each entry is the first entry of an array
651 * terminated by zero length name.
653 struct list_head cfts
;
656 * Base cftypes which are automatically registered. The two can
657 * point to the same array.
659 struct cftype
*dfl_cftypes
; /* for the default hierarchy */
660 struct cftype
*legacy_cftypes
; /* for the legacy hierarchies */
663 * A subsystem may depend on other subsystems. When such subsystem
664 * is enabled on a cgroup, the depended-upon subsystems are enabled
665 * together if available. Subsystems enabled due to dependency are
666 * not visible to userland until explicitly enabled. The following
667 * specifies the mask of subsystems that this one depends on.
669 unsigned int depends_on
;
672 extern struct percpu_rw_semaphore cgroup_threadgroup_rwsem
;
675 * cgroup_threadgroup_change_begin - threadgroup exclusion for cgroups
678 * Allows cgroup operations to synchronize against threadgroup changes
679 * using a percpu_rw_semaphore.
681 static inline void cgroup_threadgroup_change_begin(struct task_struct
*tsk
)
683 percpu_down_read(&cgroup_threadgroup_rwsem
);
687 * cgroup_threadgroup_change_end - threadgroup exclusion for cgroups
690 * Counterpart of cgroup_threadcgroup_change_begin().
692 static inline void cgroup_threadgroup_change_end(struct task_struct
*tsk
)
694 percpu_up_read(&cgroup_threadgroup_rwsem
);
697 #else /* CONFIG_CGROUPS */
699 #define CGROUP_SUBSYS_COUNT 0
701 static inline void cgroup_threadgroup_change_begin(struct task_struct
*tsk
)
706 static inline void cgroup_threadgroup_change_end(struct task_struct
*tsk
) {}
708 #endif /* CONFIG_CGROUPS */
710 #ifdef CONFIG_SOCK_CGROUP_DATA
713 * sock_cgroup_data is embedded at sock->sk_cgrp_data and contains
714 * per-socket cgroup information except for memcg association.
716 * On legacy hierarchies, net_prio and net_cls controllers directly set
717 * attributes on each sock which can then be tested by the network layer.
718 * On the default hierarchy, each sock is associated with the cgroup it was
719 * created in and the networking layer can match the cgroup directly.
721 * To avoid carrying all three cgroup related fields separately in sock,
722 * sock_cgroup_data overloads (prioidx, classid) and the cgroup pointer.
723 * On boot, sock_cgroup_data records the cgroup that the sock was created
724 * in so that cgroup2 matches can be made; however, once either net_prio or
725 * net_cls starts being used, the area is overriden to carry prioidx and/or
726 * classid. The two modes are distinguished by whether the lowest bit is
727 * set. Clear bit indicates cgroup pointer while set bit prioidx and
730 * While userland may start using net_prio or net_cls at any time, once
731 * either is used, cgroup2 matching no longer works. There is no reason to
732 * mix the two and this is in line with how legacy and v2 compatibility is
733 * handled. On mode switch, cgroup references which are already being
734 * pointed to by socks may be leaked. While this can be remedied by adding
735 * synchronization around sock_cgroup_data, given that the number of leaked
736 * cgroups is bound and highly unlikely to be high, this seems to be the
739 struct sock_cgroup_data
{
741 #ifdef __LITTLE_ENDIAN
761 * There's a theoretical window where the following accessors race with
762 * updaters and return part of the previous pointer as the prioidx or
763 * classid. Such races are short-lived and the result isn't critical.
765 static inline u16
sock_cgroup_prioidx(const struct sock_cgroup_data
*skcd
)
767 /* fallback to 1 which is always the ID of the root cgroup */
768 return (skcd
->is_data
& 1) ? skcd
->prioidx
: 1;
771 static inline u32
sock_cgroup_classid(const struct sock_cgroup_data
*skcd
)
773 /* fallback to 0 which is the unconfigured default classid */
774 return (skcd
->is_data
& 1) ? skcd
->classid
: 0;
778 * If invoked concurrently, the updaters may clobber each other. The
779 * caller is responsible for synchronization.
781 static inline void sock_cgroup_set_prioidx(struct sock_cgroup_data
*skcd
,
784 struct sock_cgroup_data skcd_buf
= {{ .val
= READ_ONCE(skcd
->val
) }};
786 if (sock_cgroup_prioidx(&skcd_buf
) == prioidx
)
789 if (!(skcd_buf
.is_data
& 1)) {
791 skcd_buf
.is_data
= 1;
794 skcd_buf
.prioidx
= prioidx
;
795 WRITE_ONCE(skcd
->val
, skcd_buf
.val
); /* see sock_cgroup_ptr() */
798 static inline void sock_cgroup_set_classid(struct sock_cgroup_data
*skcd
,
801 struct sock_cgroup_data skcd_buf
= {{ .val
= READ_ONCE(skcd
->val
) }};
803 if (sock_cgroup_classid(&skcd_buf
) == classid
)
806 if (!(skcd_buf
.is_data
& 1)) {
808 skcd_buf
.is_data
= 1;
811 skcd_buf
.classid
= classid
;
812 WRITE_ONCE(skcd
->val
, skcd_buf
.val
); /* see sock_cgroup_ptr() */
815 #else /* CONFIG_SOCK_CGROUP_DATA */
817 struct sock_cgroup_data
{
820 #endif /* CONFIG_SOCK_CGROUP_DATA */
822 #endif /* _LINUX_CGROUP_DEFS_H */