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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Christoph Lameter97d06602012-07-06 15:25:11 -05002#ifndef MM_SLAB_H
3#define MM_SLAB_H
4/*
5 * Internal slab definitions
6 */
7
Joonsoo Kim07f361b2014-10-09 15:26:00 -07008#ifdef CONFIG_SLOB
9/*
10 * Common fields provided in kmem_cache by all slab allocators
11 * This struct is either used directly by the allocator (SLOB)
12 * or the allocator must include definitions for all fields
13 * provided in kmem_cache_common in their definition of kmem_cache.
14 *
15 * Once we can do anonymous structs (C11 standard) we could put a
16 * anonymous struct definition in these allocators so that the
17 * separate allocations in the kmem_cache structure of SLAB and
18 * SLUB is no longer needed.
19 */
20struct kmem_cache {
21 unsigned int object_size;/* The original size of the object */
22 unsigned int size; /* The aligned/padded/added on size */
23 unsigned int align; /* Alignment as calculated */
Alexey Dobriyand50112e2017-11-15 17:32:18 -080024 slab_flags_t flags; /* Active flags on the slab */
David Windsor8eb82842017-06-10 22:50:28 -040025 size_t useroffset; /* Usercopy region offset */
26 size_t usersize; /* Usercopy region size */
Joonsoo Kim07f361b2014-10-09 15:26:00 -070027 const char *name; /* Slab name for sysfs */
28 int refcount; /* Use counter */
29 void (*ctor)(void *); /* Called on object slot creation */
30 struct list_head list; /* List of all slab caches on the system */
31};
32
33#endif /* CONFIG_SLOB */
34
35#ifdef CONFIG_SLAB
36#include <linux/slab_def.h>
37#endif
38
39#ifdef CONFIG_SLUB
40#include <linux/slub_def.h>
41#endif
42
43#include <linux/memcontrol.h>
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -070044#include <linux/fault-inject.h>
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -070045#include <linux/kasan.h>
46#include <linux/kmemleak.h>
Thomas Garnier7c00fce2016-07-26 15:21:56 -070047#include <linux/random.h>
Peter Zijlstrad92a8cf2017-03-03 10:13:38 +010048#include <linux/sched/mm.h>
Joonsoo Kim07f361b2014-10-09 15:26:00 -070049
Christoph Lameter97d06602012-07-06 15:25:11 -050050/*
51 * State of the slab allocator.
52 *
53 * This is used to describe the states of the allocator during bootup.
54 * Allocators use this to gradually bootstrap themselves. Most allocators
55 * have the problem that the structures used for managing slab caches are
56 * allocated from slab caches themselves.
57 */
58enum slab_state {
59 DOWN, /* No slab functionality yet */
60 PARTIAL, /* SLUB: kmem_cache_node available */
Christoph Lameterce8eb6c2013-01-10 19:14:19 +000061 PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
Christoph Lameter97d06602012-07-06 15:25:11 -050062 UP, /* Slab caches usable but not all extras yet */
63 FULL /* Everything is working */
64};
65
66extern enum slab_state slab_state;
67
Christoph Lameter18004c52012-07-06 15:25:12 -050068/* The slab cache mutex protects the management structures during changes */
69extern struct mutex slab_mutex;
Christoph Lameter9b030cb2012-09-05 00:20:33 +000070
71/* The list of all slab caches on the system */
Christoph Lameter18004c52012-07-06 15:25:12 -050072extern struct list_head slab_caches;
73
Christoph Lameter9b030cb2012-09-05 00:20:33 +000074/* The slab cache that manages slab cache information */
75extern struct kmem_cache *kmem_cache;
76
Vlastimil Babkaaf3b5f82017-02-22 15:41:05 -080077/* A table of kmalloc cache names and sizes */
78extern const struct kmalloc_info_struct {
79 const char *name;
80 unsigned long size;
81} kmalloc_info[];
82
Alexey Dobriyand50112e2017-11-15 17:32:18 -080083unsigned long calculate_alignment(slab_flags_t flags,
Christoph Lameter45906852012-11-28 16:23:16 +000084 unsigned long align, unsigned long size);
85
Christoph Lameterf97d5f62013-01-10 19:12:17 +000086#ifndef CONFIG_SLOB
87/* Kmalloc array related functions */
Daniel Sanders34cc6992015-06-24 16:55:57 -070088void setup_kmalloc_cache_index_table(void);
Alexey Dobriyand50112e2017-11-15 17:32:18 -080089void create_kmalloc_caches(slab_flags_t);
Christoph Lameter2c59dd62013-01-10 19:14:19 +000090
91/* Find the kmalloc slab corresponding for a certain size */
92struct kmem_cache *kmalloc_slab(size_t, gfp_t);
Christoph Lameterf97d5f62013-01-10 19:12:17 +000093#endif
94
95
Christoph Lameter9b030cb2012-09-05 00:20:33 +000096/* Functions provided by the slab allocators */
Alexey Dobriyand50112e2017-11-15 17:32:18 -080097int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
Christoph Lameter97d06602012-07-06 15:25:11 -050098
Christoph Lameter45530c42012-11-28 16:23:07 +000099extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
David Windsor6c0c21a2017-06-10 22:50:47 -0400100 slab_flags_t flags, size_t useroffset,
101 size_t usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +0000102extern void create_boot_cache(struct kmem_cache *, const char *name,
David Windsor8eb82842017-06-10 22:50:28 -0400103 size_t size, slab_flags_t flags, size_t useroffset,
104 size_t usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +0000105
Joonsoo Kim423c9292014-10-09 15:26:22 -0700106int slab_unmergeable(struct kmem_cache *s);
107struct kmem_cache *find_mergeable(size_t size, size_t align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800108 slab_flags_t flags, const char *name, void (*ctor)(void *));
Joonsoo Kim12220de2014-10-09 15:26:24 -0700109#ifndef CONFIG_SLOB
Glauber Costa2633d7a2012-12-18 14:22:34 -0800110struct kmem_cache *
Vladimir Davydova44cb9442014-04-07 15:39:23 -0700111__kmem_cache_alias(const char *name, size_t size, size_t align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800112 slab_flags_t flags, void (*ctor)(void *));
Joonsoo Kim423c9292014-10-09 15:26:22 -0700113
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800114slab_flags_t kmem_cache_flags(unsigned long object_size,
115 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700116 void (*ctor)(void *));
Christoph Lametercbb79692012-09-05 00:18:32 +0000117#else
Glauber Costa2633d7a2012-12-18 14:22:34 -0800118static inline struct kmem_cache *
Vladimir Davydova44cb9442014-04-07 15:39:23 -0700119__kmem_cache_alias(const char *name, size_t size, size_t align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800120 slab_flags_t flags, void (*ctor)(void *))
Christoph Lametercbb79692012-09-05 00:18:32 +0000121{ return NULL; }
Joonsoo Kim423c9292014-10-09 15:26:22 -0700122
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800123static inline slab_flags_t kmem_cache_flags(unsigned long object_size,
124 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700125 void (*ctor)(void *))
126{
127 return flags;
128}
Christoph Lametercbb79692012-09-05 00:18:32 +0000129#endif
130
131
Glauber Costad8843922012-10-17 15:36:51 +0400132/* Legal flag mask for kmem_cache_create(), for various configurations */
133#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800134 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
Glauber Costad8843922012-10-17 15:36:51 +0400135
136#if defined(CONFIG_DEBUG_SLAB)
137#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
138#elif defined(CONFIG_SLUB_DEBUG)
139#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
Laura Abbottbecfda62016-03-15 14:55:06 -0700140 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
Glauber Costad8843922012-10-17 15:36:51 +0400141#else
142#define SLAB_DEBUG_FLAGS (0)
143#endif
144
145#if defined(CONFIG_SLAB)
146#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
Vladimir Davydov230e9fc2016-01-14 15:18:15 -0800147 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800148 SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400149#elif defined(CONFIG_SLUB)
150#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800151 SLAB_TEMPORARY | SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400152#else
153#define SLAB_CACHE_FLAGS (0)
154#endif
155
Thomas Garniere70954f2016-12-12 16:41:38 -0800156/* Common flags available with current configuration */
Glauber Costad8843922012-10-17 15:36:51 +0400157#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
158
Thomas Garniere70954f2016-12-12 16:41:38 -0800159/* Common flags permitted for kmem_cache_create */
160#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
161 SLAB_RED_ZONE | \
162 SLAB_POISON | \
163 SLAB_STORE_USER | \
164 SLAB_TRACE | \
165 SLAB_CONSISTENCY_CHECKS | \
166 SLAB_MEM_SPREAD | \
167 SLAB_NOLEAKTRACE | \
168 SLAB_RECLAIM_ACCOUNT | \
169 SLAB_TEMPORARY | \
Thomas Garniere70954f2016-12-12 16:41:38 -0800170 SLAB_ACCOUNT)
171
Christoph Lameter945cf2b2012-09-04 23:18:33 +0000172int __kmem_cache_shutdown(struct kmem_cache *);
Dmitry Safonov52b4b952016-02-17 13:11:37 -0800173void __kmem_cache_release(struct kmem_cache *);
Tejun Heoc9fc5862017-02-22 15:41:27 -0800174int __kmem_cache_shrink(struct kmem_cache *);
175void __kmemcg_cache_deactivate(struct kmem_cache *s);
Christoph Lameter41a21282014-05-06 12:50:08 -0700176void slab_kmem_cache_release(struct kmem_cache *);
Christoph Lameter945cf2b2012-09-04 23:18:33 +0000177
Glauber Costab7454ad2012-10-19 18:20:25 +0400178struct seq_file;
179struct file;
Glauber Costab7454ad2012-10-19 18:20:25 +0400180
Glauber Costa0d7561c2012-10-19 18:20:27 +0400181struct slabinfo {
182 unsigned long active_objs;
183 unsigned long num_objs;
184 unsigned long active_slabs;
185 unsigned long num_slabs;
186 unsigned long shared_avail;
187 unsigned int limit;
188 unsigned int batchcount;
189 unsigned int shared;
190 unsigned int objects_per_slab;
191 unsigned int cache_order;
192};
193
194void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
195void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
Glauber Costab7454ad2012-10-19 18:20:25 +0400196ssize_t slabinfo_write(struct file *file, const char __user *buffer,
197 size_t count, loff_t *ppos);
Glauber Costaba6c4962012-12-18 14:22:27 -0800198
Christoph Lameter484748f2015-09-04 15:45:34 -0700199/*
200 * Generic implementation of bulk operations
201 * These are useful for situations in which the allocator cannot
Jesper Dangaard Brouer9f706d62016-03-15 14:54:03 -0700202 * perform optimizations. In that case segments of the object listed
Christoph Lameter484748f2015-09-04 15:45:34 -0700203 * may be allocated or freed using these operations.
204 */
205void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
Jesper Dangaard Brouer865762a2015-11-20 15:57:58 -0800206int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
Christoph Lameter484748f2015-09-04 15:45:34 -0700207
Johannes Weiner127424c2016-01-20 15:02:32 -0800208#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
Tejun Heo510ded32017-02-22 15:41:24 -0800209
210/* List of all root caches. */
211extern struct list_head slab_root_caches;
212#define root_caches_node memcg_params.__root_caches_node
213
Vladimir Davydov426589f2015-02-12 14:59:23 -0800214/*
215 * Iterate over all memcg caches of the given root cache. The caller must hold
216 * slab_mutex.
217 */
218#define for_each_memcg_cache(iter, root) \
Tejun Heo9eeadc82017-02-22 15:41:17 -0800219 list_for_each_entry(iter, &(root)->memcg_params.children, \
220 memcg_params.children_node)
Vladimir Davydov426589f2015-02-12 14:59:23 -0800221
Glauber Costaba6c4962012-12-18 14:22:27 -0800222static inline bool is_root_cache(struct kmem_cache *s)
223{
Tejun Heo9eeadc82017-02-22 15:41:17 -0800224 return !s->memcg_params.root_cache;
Glauber Costaba6c4962012-12-18 14:22:27 -0800225}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800226
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800227static inline bool slab_equal_or_root(struct kmem_cache *s,
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800228 struct kmem_cache *p)
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800229{
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800230 return p == s || p == s->memcg_params.root_cache;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800231}
Glauber Costa749c5412012-12-18 14:23:01 -0800232
233/*
234 * We use suffixes to the name in memcg because we can't have caches
235 * created in the system with the same name. But when we print them
236 * locally, better refer to them with the base name
237 */
238static inline const char *cache_name(struct kmem_cache *s)
239{
240 if (!is_root_cache(s))
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800241 s = s->memcg_params.root_cache;
Glauber Costa749c5412012-12-18 14:23:01 -0800242 return s->name;
243}
244
Vladimir Davydovf8570262014-01-23 15:53:06 -0800245/*
246 * Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800247 * That said the caller must assure the memcg's cache won't go away by either
248 * taking a css reference to the owner cgroup, or holding the slab_mutex.
Vladimir Davydovf8570262014-01-23 15:53:06 -0800249 */
Qiang Huang2ade4de2013-11-12 15:08:23 -0800250static inline struct kmem_cache *
251cache_from_memcg_idx(struct kmem_cache *s, int idx)
Glauber Costa749c5412012-12-18 14:23:01 -0800252{
Vladimir Davydov959c8962014-01-23 15:52:59 -0800253 struct kmem_cache *cachep;
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800254 struct memcg_cache_array *arr;
Vladimir Davydovf8570262014-01-23 15:53:06 -0800255
256 rcu_read_lock();
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800257 arr = rcu_dereference(s->memcg_params.memcg_caches);
Vladimir Davydov959c8962014-01-23 15:52:59 -0800258
259 /*
260 * Make sure we will access the up-to-date value. The code updating
261 * memcg_caches issues a write barrier to match this (see
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800262 * memcg_create_kmem_cache()).
Vladimir Davydov959c8962014-01-23 15:52:59 -0800263 */
Will Deacon506458e2017-10-24 11:22:48 +0100264 cachep = READ_ONCE(arr->entries[idx]);
Pranith Kumar8df0c2d2014-12-10 15:42:28 -0800265 rcu_read_unlock();
266
Vladimir Davydov959c8962014-01-23 15:52:59 -0800267 return cachep;
Glauber Costa749c5412012-12-18 14:23:01 -0800268}
Glauber Costa943a4512012-12-18 14:23:03 -0800269
270static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
271{
272 if (is_root_cache(s))
273 return s;
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800274 return s->memcg_params.root_cache;
Glauber Costa943a4512012-12-18 14:23:03 -0800275}
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700276
Vladimir Davydovf3ccb2c42015-11-05 18:49:01 -0800277static __always_inline int memcg_charge_slab(struct page *page,
278 gfp_t gfp, int order,
279 struct kmem_cache *s)
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700280{
281 if (!memcg_kmem_enabled())
282 return 0;
283 if (is_root_cache(s))
284 return 0;
Johannes Weiner7779f212017-07-06 15:40:55 -0700285 return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700286}
287
288static __always_inline void memcg_uncharge_slab(struct page *page, int order,
289 struct kmem_cache *s)
290{
Vladimir Davydov45264772016-07-26 15:24:21 -0700291 if (!memcg_kmem_enabled())
292 return;
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700293 memcg_kmem_uncharge(page, order);
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700294}
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800295
296extern void slab_init_memcg_params(struct kmem_cache *);
Tejun Heo510ded32017-02-22 15:41:24 -0800297extern void memcg_link_cache(struct kmem_cache *s);
Tejun Heo01fb58b2017-02-22 15:41:30 -0800298extern void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
299 void (*deact_fn)(struct kmem_cache *));
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800300
Johannes Weiner127424c2016-01-20 15:02:32 -0800301#else /* CONFIG_MEMCG && !CONFIG_SLOB */
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800302
Tejun Heo510ded32017-02-22 15:41:24 -0800303/* If !memcg, all caches are root. */
304#define slab_root_caches slab_caches
305#define root_caches_node list
306
Vladimir Davydov426589f2015-02-12 14:59:23 -0800307#define for_each_memcg_cache(iter, root) \
308 for ((void)(iter), (void)(root); 0; )
Vladimir Davydov426589f2015-02-12 14:59:23 -0800309
Glauber Costaba6c4962012-12-18 14:22:27 -0800310static inline bool is_root_cache(struct kmem_cache *s)
311{
312 return true;
313}
314
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800315static inline bool slab_equal_or_root(struct kmem_cache *s,
316 struct kmem_cache *p)
317{
318 return true;
319}
Glauber Costa749c5412012-12-18 14:23:01 -0800320
321static inline const char *cache_name(struct kmem_cache *s)
322{
323 return s->name;
324}
325
Qiang Huang2ade4de2013-11-12 15:08:23 -0800326static inline struct kmem_cache *
327cache_from_memcg_idx(struct kmem_cache *s, int idx)
Glauber Costa749c5412012-12-18 14:23:01 -0800328{
329 return NULL;
330}
Glauber Costa943a4512012-12-18 14:23:03 -0800331
332static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
333{
334 return s;
335}
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700336
Vladimir Davydovf3ccb2c42015-11-05 18:49:01 -0800337static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
338 struct kmem_cache *s)
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700339{
340 return 0;
341}
342
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700343static inline void memcg_uncharge_slab(struct page *page, int order,
344 struct kmem_cache *s)
345{
346}
347
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800348static inline void slab_init_memcg_params(struct kmem_cache *s)
349{
350}
Tejun Heo510ded32017-02-22 15:41:24 -0800351
352static inline void memcg_link_cache(struct kmem_cache *s)
353{
354}
355
Johannes Weiner127424c2016-01-20 15:02:32 -0800356#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800357
358static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
359{
360 struct kmem_cache *cachep;
361 struct page *page;
362
363 /*
364 * When kmemcg is not being used, both assignments should return the
365 * same value. but we don't want to pay the assignment price in that
366 * case. If it is not compiled in, the compiler should be smart enough
367 * to not do even the assignment. In that case, slab_equal_or_root
368 * will also be a constant.
369 */
Laura Abbottbecfda62016-03-15 14:55:06 -0700370 if (!memcg_kmem_enabled() &&
371 !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800372 return s;
373
374 page = virt_to_head_page(x);
375 cachep = page->slab_cache;
376 if (slab_equal_or_root(cachep, s))
377 return cachep;
378
379 pr_err("%s: Wrong slab cache. %s but object is from %s\n",
Daniel Borkmann2d16e0fd2015-09-04 15:45:57 -0700380 __func__, s->name, cachep->name);
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800381 WARN_ON_ONCE(1);
382 return s;
383}
Christoph Lameterca349562013-01-10 19:14:19 +0000384
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700385static inline size_t slab_ksize(const struct kmem_cache *s)
386{
387#ifndef CONFIG_SLUB
388 return s->object_size;
389
390#else /* CONFIG_SLUB */
391# ifdef CONFIG_SLUB_DEBUG
392 /*
393 * Debugging requires use of the padding between object
394 * and whatever may come after it.
395 */
396 if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
397 return s->object_size;
398# endif
Alexander Potapenko80a92012016-07-28 15:49:07 -0700399 if (s->flags & SLAB_KASAN)
400 return s->object_size;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700401 /*
402 * If we have the need to store the freelist pointer
403 * back there or track user information then we can
404 * only use the space before that information.
405 */
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800406 if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700407 return s->inuse;
408 /*
409 * Else we can use all the padding etc for the allocation
410 */
411 return s->size;
412#endif
413}
414
415static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
416 gfp_t flags)
417{
418 flags &= gfp_allowed_mask;
Peter Zijlstrad92a8cf2017-03-03 10:13:38 +0100419
420 fs_reclaim_acquire(flags);
421 fs_reclaim_release(flags);
422
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700423 might_sleep_if(gfpflags_allow_blocking(flags));
424
Jesper Dangaard Brouerfab99632016-03-15 14:53:38 -0700425 if (should_failslab(s, flags))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700426 return NULL;
427
Vladimir Davydov45264772016-07-26 15:24:21 -0700428 if (memcg_kmem_enabled() &&
429 ((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT)))
430 return memcg_kmem_get_cache(s);
431
432 return s;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700433}
434
435static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
436 size_t size, void **p)
437{
438 size_t i;
439
440 flags &= gfp_allowed_mask;
441 for (i = 0; i < size; i++) {
442 void *object = p[i];
443
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700444 kmemleak_alloc_recursive(object, s->object_size, 1,
445 s->flags, flags);
Alexander Potapenko505f5dc2016-03-25 14:22:02 -0700446 kasan_slab_alloc(s, object, flags);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700447 }
Vladimir Davydov45264772016-07-26 15:24:21 -0700448
449 if (memcg_kmem_enabled())
450 memcg_kmem_put_cache(s);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700451}
452
Christoph Lameter44c53562014-08-06 16:04:07 -0700453#ifndef CONFIG_SLOB
Christoph Lameterca349562013-01-10 19:14:19 +0000454/*
455 * The slab lists for all objects.
456 */
457struct kmem_cache_node {
458 spinlock_t list_lock;
459
460#ifdef CONFIG_SLAB
461 struct list_head slabs_partial; /* partial list first, better asm code */
462 struct list_head slabs_full;
463 struct list_head slabs_free;
David Rientjesbf00bd32016-12-12 16:41:44 -0800464 unsigned long total_slabs; /* length of all slab lists */
465 unsigned long free_slabs; /* length of free slab list only */
Christoph Lameterca349562013-01-10 19:14:19 +0000466 unsigned long free_objects;
467 unsigned int free_limit;
468 unsigned int colour_next; /* Per-node cache coloring */
469 struct array_cache *shared; /* shared per node */
Joonsoo Kimc8522a32014-08-06 16:04:29 -0700470 struct alien_cache **alien; /* on other nodes */
Christoph Lameterca349562013-01-10 19:14:19 +0000471 unsigned long next_reap; /* updated without locking */
472 int free_touched; /* updated without locking */
473#endif
474
475#ifdef CONFIG_SLUB
476 unsigned long nr_partial;
477 struct list_head partial;
478#ifdef CONFIG_SLUB_DEBUG
479 atomic_long_t nr_slabs;
480 atomic_long_t total_objects;
481 struct list_head full;
482#endif
483#endif
484
485};
Wanpeng Lie25839f2013-07-04 08:33:23 +0800486
Christoph Lameter44c53562014-08-06 16:04:07 -0700487static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
488{
489 return s->node[node];
490}
491
492/*
493 * Iterator over all nodes. The body will be executed for each node that has
494 * a kmem_cache_node structure allocated (which is true for all online nodes)
495 */
496#define for_each_kmem_cache_node(__s, __node, __n) \
Mikulas Patocka91635822014-10-09 15:26:20 -0700497 for (__node = 0; __node < nr_node_ids; __node++) \
498 if ((__n = get_node(__s, __node)))
Christoph Lameter44c53562014-08-06 16:04:07 -0700499
500#endif
501
Vladimir Davydov1df3b262014-12-10 15:42:16 -0800502void *slab_start(struct seq_file *m, loff_t *pos);
Wanpeng Li276a2432013-07-08 08:08:28 +0800503void *slab_next(struct seq_file *m, void *p, loff_t *pos);
504void slab_stop(struct seq_file *m, void *p);
Tejun Heobc2791f2017-02-22 15:41:21 -0800505void *memcg_slab_start(struct seq_file *m, loff_t *pos);
506void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos);
507void memcg_slab_stop(struct seq_file *m, void *p);
Vladimir Davydovb0475012014-12-10 15:44:19 -0800508int memcg_slab_show(struct seq_file *m, void *p);
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700509
Yang Shi852d8be2017-11-15 17:32:07 -0800510#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
511void dump_unreclaimable_slab(void);
512#else
513static inline void dump_unreclaimable_slab(void)
514{
515}
516#endif
517
Alexander Potapenko55834c52016-05-20 16:59:11 -0700518void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
519
Thomas Garnier7c00fce2016-07-26 15:21:56 -0700520#ifdef CONFIG_SLAB_FREELIST_RANDOM
521int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
522 gfp_t gfp);
523void cache_random_seq_destroy(struct kmem_cache *cachep);
524#else
525static inline int cache_random_seq_create(struct kmem_cache *cachep,
526 unsigned int count, gfp_t gfp)
527{
528 return 0;
529}
530static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
531#endif /* CONFIG_SLAB_FREELIST_RANDOM */
532
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700533#endif /* MM_SLAB_H */