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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 */
Alexey Dobriyan7bbdb812018-04-05 16:21:31 -070025 unsigned int useroffset;/* Usercopy region offset */
26 unsigned int 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;
Alexey Dobriyan55de8b92018-04-05 16:20:29 -070080 unsigned int size;
Vlastimil Babkaaf3b5f82017-02-22 15:41:05 -080081} kmalloc_info[];
82
Christoph Lameterf97d5f62013-01-10 19:12:17 +000083#ifndef CONFIG_SLOB
84/* Kmalloc array related functions */
Daniel Sanders34cc6992015-06-24 16:55:57 -070085void setup_kmalloc_cache_index_table(void);
Alexey Dobriyand50112e2017-11-15 17:32:18 -080086void create_kmalloc_caches(slab_flags_t);
Christoph Lameter2c59dd62013-01-10 19:14:19 +000087
88/* Find the kmalloc slab corresponding for a certain size */
89struct kmem_cache *kmalloc_slab(size_t, gfp_t);
Christoph Lameterf97d5f62013-01-10 19:12:17 +000090#endif
91
92
Christoph Lameter9b030cb2012-09-05 00:20:33 +000093/* Functions provided by the slab allocators */
Alexey Dobriyand50112e2017-11-15 17:32:18 -080094int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
Christoph Lameter97d06602012-07-06 15:25:11 -050095
Alexey Dobriyan55de8b92018-04-05 16:20:29 -070096struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size,
97 slab_flags_t flags, unsigned int useroffset,
98 unsigned int usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +000099extern void create_boot_cache(struct kmem_cache *, const char *name,
Alexey Dobriyan361d5752018-04-05 16:20:33 -0700100 unsigned int size, slab_flags_t flags,
101 unsigned int useroffset, unsigned int usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +0000102
Joonsoo Kim423c9292014-10-09 15:26:22 -0700103int slab_unmergeable(struct kmem_cache *s);
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700104struct kmem_cache *find_mergeable(unsigned size, unsigned align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800105 slab_flags_t flags, const char *name, void (*ctor)(void *));
Joonsoo Kim12220de2014-10-09 15:26:24 -0700106#ifndef CONFIG_SLOB
Glauber Costa2633d7a2012-12-18 14:22:34 -0800107struct kmem_cache *
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700108__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800109 slab_flags_t flags, void (*ctor)(void *));
Joonsoo Kim423c9292014-10-09 15:26:22 -0700110
Alexey Dobriyan0293d1f2018-04-05 16:21:24 -0700111slab_flags_t kmem_cache_flags(unsigned int object_size,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800112 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700113 void (*ctor)(void *));
Christoph Lametercbb79692012-09-05 00:18:32 +0000114#else
Glauber Costa2633d7a2012-12-18 14:22:34 -0800115static inline struct kmem_cache *
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700116__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800117 slab_flags_t flags, void (*ctor)(void *))
Christoph Lametercbb79692012-09-05 00:18:32 +0000118{ return NULL; }
Joonsoo Kim423c9292014-10-09 15:26:22 -0700119
Alexey Dobriyan0293d1f2018-04-05 16:21:24 -0700120static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800121 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700122 void (*ctor)(void *))
123{
124 return flags;
125}
Christoph Lametercbb79692012-09-05 00:18:32 +0000126#endif
127
128
Glauber Costad8843922012-10-17 15:36:51 +0400129/* Legal flag mask for kmem_cache_create(), for various configurations */
Nicolas Boichat6d6ea1e2019-03-28 20:43:42 -0700130#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
131 SLAB_CACHE_DMA32 | SLAB_PANIC | \
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800132 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
Glauber Costad8843922012-10-17 15:36:51 +0400133
134#if defined(CONFIG_DEBUG_SLAB)
135#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
136#elif defined(CONFIG_SLUB_DEBUG)
137#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
Laura Abbottbecfda62016-03-15 14:55:06 -0700138 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
Glauber Costad8843922012-10-17 15:36:51 +0400139#else
140#define SLAB_DEBUG_FLAGS (0)
141#endif
142
143#if defined(CONFIG_SLAB)
144#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
Vladimir Davydov230e9fc2016-01-14 15:18:15 -0800145 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800146 SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400147#elif defined(CONFIG_SLUB)
148#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800149 SLAB_TEMPORARY | SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400150#else
151#define SLAB_CACHE_FLAGS (0)
152#endif
153
Thomas Garniere70954f2016-12-12 16:41:38 -0800154/* Common flags available with current configuration */
Glauber Costad8843922012-10-17 15:36:51 +0400155#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
156
Thomas Garniere70954f2016-12-12 16:41:38 -0800157/* Common flags permitted for kmem_cache_create */
158#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
159 SLAB_RED_ZONE | \
160 SLAB_POISON | \
161 SLAB_STORE_USER | \
162 SLAB_TRACE | \
163 SLAB_CONSISTENCY_CHECKS | \
164 SLAB_MEM_SPREAD | \
165 SLAB_NOLEAKTRACE | \
166 SLAB_RECLAIM_ACCOUNT | \
167 SLAB_TEMPORARY | \
Thomas Garniere70954f2016-12-12 16:41:38 -0800168 SLAB_ACCOUNT)
169
Shakeel Buttf9e13c02018-04-05 16:21:57 -0700170bool __kmem_cache_empty(struct kmem_cache *);
Christoph Lameter945cf2b2012-09-04 23:18:33 +0000171int __kmem_cache_shutdown(struct kmem_cache *);
Dmitry Safonov52b4b952016-02-17 13:11:37 -0800172void __kmem_cache_release(struct kmem_cache *);
Tejun Heoc9fc5862017-02-22 15:41:27 -0800173int __kmem_cache_shrink(struct kmem_cache *);
174void __kmemcg_cache_deactivate(struct kmem_cache *s);
Roman Gushchin43486692019-07-11 20:56:09 -0700175void __kmemcg_cache_deactivate_after_rcu(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
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700208#ifdef CONFIG_MEMCG_KMEM
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{
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700281 if (is_root_cache(s))
282 return 0;
Johannes Weiner7779f212017-07-06 15:40:55 -0700283 return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700284}
285
286static __always_inline void memcg_uncharge_slab(struct page *page, int order,
287 struct kmem_cache *s)
288{
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700289 memcg_kmem_uncharge(page, order);
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700290}
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800291
292extern void slab_init_memcg_params(struct kmem_cache *);
Roman Gushchinc03914b2019-07-11 20:56:02 -0700293extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg);
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800294
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700295#else /* CONFIG_MEMCG_KMEM */
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800296
Tejun Heo510ded32017-02-22 15:41:24 -0800297/* If !memcg, all caches are root. */
298#define slab_root_caches slab_caches
299#define root_caches_node list
300
Vladimir Davydov426589f2015-02-12 14:59:23 -0800301#define for_each_memcg_cache(iter, root) \
302 for ((void)(iter), (void)(root); 0; )
Vladimir Davydov426589f2015-02-12 14:59:23 -0800303
Glauber Costaba6c4962012-12-18 14:22:27 -0800304static inline bool is_root_cache(struct kmem_cache *s)
305{
306 return true;
307}
308
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800309static inline bool slab_equal_or_root(struct kmem_cache *s,
310 struct kmem_cache *p)
311{
Kees Cook598a0712019-07-11 20:53:23 -0700312 return s == p;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800313}
Glauber Costa749c5412012-12-18 14:23:01 -0800314
315static inline const char *cache_name(struct kmem_cache *s)
316{
317 return s->name;
318}
319
Qiang Huang2ade4de2013-11-12 15:08:23 -0800320static inline struct kmem_cache *
321cache_from_memcg_idx(struct kmem_cache *s, int idx)
Glauber Costa749c5412012-12-18 14:23:01 -0800322{
323 return NULL;
324}
Glauber Costa943a4512012-12-18 14:23:03 -0800325
326static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
327{
328 return s;
329}
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700330
Vladimir Davydovf3ccb2c42015-11-05 18:49:01 -0800331static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
332 struct kmem_cache *s)
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700333{
334 return 0;
335}
336
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700337static inline void memcg_uncharge_slab(struct page *page, int order,
338 struct kmem_cache *s)
339{
340}
341
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800342static inline void slab_init_memcg_params(struct kmem_cache *s)
343{
344}
Tejun Heo510ded32017-02-22 15:41:24 -0800345
Roman Gushchinc03914b2019-07-11 20:56:02 -0700346static inline void memcg_link_cache(struct kmem_cache *s,
347 struct mem_cgroup *memcg)
Tejun Heo510ded32017-02-22 15:41:24 -0800348{
349}
350
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700351#endif /* CONFIG_MEMCG_KMEM */
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800352
Kees Cooka64b5372019-07-11 20:53:26 -0700353static inline struct kmem_cache *virt_to_cache(const void *obj)
354{
355 struct page *page;
356
357 page = virt_to_head_page(obj);
358 if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n",
359 __func__))
360 return NULL;
361 return page->slab_cache;
362}
363
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800364static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
365{
366 struct kmem_cache *cachep;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800367
368 /*
369 * When kmemcg is not being used, both assignments should return the
370 * same value. but we don't want to pay the assignment price in that
371 * case. If it is not compiled in, the compiler should be smart enough
372 * to not do even the assignment. In that case, slab_equal_or_root
373 * will also be a constant.
374 */
Laura Abbottbecfda62016-03-15 14:55:06 -0700375 if (!memcg_kmem_enabled() &&
Kees Cook598a0712019-07-11 20:53:23 -0700376 !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
Laura Abbottbecfda62016-03-15 14:55:06 -0700377 !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800378 return s;
379
Kees Cooka64b5372019-07-11 20:53:26 -0700380 cachep = virt_to_cache(x);
381 WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
Kees Cook598a0712019-07-11 20:53:23 -0700382 "%s: Wrong slab cache. %s but object is from %s\n",
383 __func__, s->name, cachep->name);
384 return cachep;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800385}
Christoph Lameterca349562013-01-10 19:14:19 +0000386
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700387static inline size_t slab_ksize(const struct kmem_cache *s)
388{
389#ifndef CONFIG_SLUB
390 return s->object_size;
391
392#else /* CONFIG_SLUB */
393# ifdef CONFIG_SLUB_DEBUG
394 /*
395 * Debugging requires use of the padding between object
396 * and whatever may come after it.
397 */
398 if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
399 return s->object_size;
400# endif
Alexander Potapenko80a92012016-07-28 15:49:07 -0700401 if (s->flags & SLAB_KASAN)
402 return s->object_size;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700403 /*
404 * If we have the need to store the freelist pointer
405 * back there or track user information then we can
406 * only use the space before that information.
407 */
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800408 if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700409 return s->inuse;
410 /*
411 * Else we can use all the padding etc for the allocation
412 */
413 return s->size;
414#endif
415}
416
417static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
418 gfp_t flags)
419{
420 flags &= gfp_allowed_mask;
Peter Zijlstrad92a8cf2017-03-03 10:13:38 +0100421
422 fs_reclaim_acquire(flags);
423 fs_reclaim_release(flags);
424
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700425 might_sleep_if(gfpflags_allow_blocking(flags));
426
Jesper Dangaard Brouerfab99632016-03-15 14:53:38 -0700427 if (should_failslab(s, flags))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700428 return NULL;
429
Vladimir Davydov45264772016-07-26 15:24:21 -0700430 if (memcg_kmem_enabled() &&
431 ((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT)))
432 return memcg_kmem_get_cache(s);
433
434 return s;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700435}
436
437static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
438 size_t size, void **p)
439{
440 size_t i;
441
442 flags &= gfp_allowed_mask;
443 for (i = 0; i < size; i++) {
Andrey Konovalov53128242019-02-20 22:19:11 -0800444 p[i] = kasan_slab_alloc(s, p[i], flags);
Andrey Konovalova2f77572019-02-20 22:19:16 -0800445 /* As p[i] might get tagged, call kmemleak hook after KASAN. */
Andrey Konovalov53128242019-02-20 22:19:11 -0800446 kmemleak_alloc_recursive(p[i], s->object_size, 1,
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700447 s->flags, flags);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700448 }
Vladimir Davydov45264772016-07-26 15:24:21 -0700449
450 if (memcg_kmem_enabled())
451 memcg_kmem_put_cache(s);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700452}
453
Christoph Lameter44c53562014-08-06 16:04:07 -0700454#ifndef CONFIG_SLOB
Christoph Lameterca349562013-01-10 19:14:19 +0000455/*
456 * The slab lists for all objects.
457 */
458struct kmem_cache_node {
459 spinlock_t list_lock;
460
461#ifdef CONFIG_SLAB
462 struct list_head slabs_partial; /* partial list first, better asm code */
463 struct list_head slabs_full;
464 struct list_head slabs_free;
David Rientjesbf00bd32016-12-12 16:41:44 -0800465 unsigned long total_slabs; /* length of all slab lists */
466 unsigned long free_slabs; /* length of free slab list only */
Christoph Lameterca349562013-01-10 19:14:19 +0000467 unsigned long free_objects;
468 unsigned int free_limit;
469 unsigned int colour_next; /* Per-node cache coloring */
470 struct array_cache *shared; /* shared per node */
Joonsoo Kimc8522a32014-08-06 16:04:29 -0700471 struct alien_cache **alien; /* on other nodes */
Christoph Lameterca349562013-01-10 19:14:19 +0000472 unsigned long next_reap; /* updated without locking */
473 int free_touched; /* updated without locking */
474#endif
475
476#ifdef CONFIG_SLUB
477 unsigned long nr_partial;
478 struct list_head partial;
479#ifdef CONFIG_SLUB_DEBUG
480 atomic_long_t nr_slabs;
481 atomic_long_t total_objects;
482 struct list_head full;
483#endif
484#endif
485
486};
Wanpeng Lie25839f2013-07-04 08:33:23 +0800487
Christoph Lameter44c53562014-08-06 16:04:07 -0700488static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
489{
490 return s->node[node];
491}
492
493/*
494 * Iterator over all nodes. The body will be executed for each node that has
495 * a kmem_cache_node structure allocated (which is true for all online nodes)
496 */
497#define for_each_kmem_cache_node(__s, __node, __n) \
Mikulas Patocka91635822014-10-09 15:26:20 -0700498 for (__node = 0; __node < nr_node_ids; __node++) \
499 if ((__n = get_node(__s, __node)))
Christoph Lameter44c53562014-08-06 16:04:07 -0700500
501#endif
502
Vladimir Davydov1df3b262014-12-10 15:42:16 -0800503void *slab_start(struct seq_file *m, loff_t *pos);
Wanpeng Li276a2432013-07-08 08:08:28 +0800504void *slab_next(struct seq_file *m, void *p, loff_t *pos);
505void slab_stop(struct seq_file *m, void *p);
Tejun Heobc2791f2017-02-22 15:41:21 -0800506void *memcg_slab_start(struct seq_file *m, loff_t *pos);
507void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos);
508void memcg_slab_stop(struct seq_file *m, void *p);
Vladimir Davydovb0475012014-12-10 15:44:19 -0800509int memcg_slab_show(struct seq_file *m, void *p);
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700510
Yang Shi852d8be2017-11-15 17:32:07 -0800511#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
512void dump_unreclaimable_slab(void);
513#else
514static inline void dump_unreclaimable_slab(void)
515{
516}
517#endif
518
Alexander Potapenko55834c52016-05-20 16:59:11 -0700519void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
520
Thomas Garnier7c00fce2016-07-26 15:21:56 -0700521#ifdef CONFIG_SLAB_FREELIST_RANDOM
522int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
523 gfp_t gfp);
524void cache_random_seq_destroy(struct kmem_cache *cachep);
525#else
526static inline int cache_random_seq_create(struct kmem_cache *cachep,
527 unsigned int count, gfp_t gfp)
528{
529 return 0;
530}
531static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
532#endif /* CONFIG_SLAB_FREELIST_RANDOM */
533
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700534#endif /* MM_SLAB_H */