[fio.git] / smalloc.c

/*
 * simple memory allocator, backed by mmap() so that it hands out memory
 * that can be shared across processes and threads
 */
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <limits.h>
#include <fcntl.h>

#include "mutex.h"
#include "arch/arch.h"
#include "os/os.h"
#include "smalloc.h"
#include "log.h"

#define SMALLOC_REDZONE		/* define to detect memory corruption */

#define SMALLOC_BPB	32	/* block size, bytes-per-bit in bitmap */
#define SMALLOC_BPI	(sizeof(unsigned int) * 8)
#define SMALLOC_BPL	(SMALLOC_BPB * SMALLOC_BPI)

#define INITIAL_SIZE	16*1024*1024	/* new pool size */
#define MAX_POOLS	1		/* maximum number of pools to setup */

#define SMALLOC_PRE_RED		0xdeadbeefU
#define SMALLOC_POST_RED	0x5aa55aa5U

unsigned int smalloc_pool_size = INITIAL_SIZE;
static const int int_mask = sizeof(int) - 1;

struct pool {
	struct fio_mutex *lock;			/* protects this pool */
	void *map;				/* map of blocks */
	unsigned int *bitmap;			/* blocks free/busy map */
	size_t free_blocks;		/* free blocks */
	size_t nr_blocks;			/* total blocks */
	size_t next_non_full;
	size_t mmap_size;
};

struct block_hdr {
	size_t size;
#ifdef SMALLOC_REDZONE
	unsigned int prered;
#endif
};

static struct pool mp[MAX_POOLS];
static unsigned int nr_pools;
static unsigned int last_pool;
static struct fio_rwlock *lock;

static inline void pool_lock(struct pool *pool)
{
	fio_mutex_down(pool->lock);
}

static inline void pool_unlock(struct pool *pool)
{
	fio_mutex_up(pool->lock);
}

static inline void global_read_lock(void)
{
	fio_rwlock_read(lock);
}

static inline void global_read_unlock(void)
{
	fio_rwlock_unlock(lock);
}

static inline void global_write_lock(void)
{
	fio_rwlock_write(lock);
}

static inline void global_write_unlock(void)
{
	fio_rwlock_unlock(lock);
}

static inline int ptr_valid(struct pool *pool, void *ptr)
{
	unsigned int pool_size = pool->nr_blocks * SMALLOC_BPL;

	return (ptr >= pool->map) && (ptr < pool->map + pool_size);
}

static inline size_t size_to_blocks(size_t size)
{
	return (size + SMALLOC_BPB - 1) / SMALLOC_BPB;
}

static int blocks_iter(struct pool *pool, unsigned int pool_idx,
		       unsigned int idx, size_t nr_blocks,
		       int (*func)(unsigned int *map, unsigned int mask))
{

	while (nr_blocks) {
		unsigned int this_blocks, mask;
		unsigned int *map;

		if (pool_idx >= pool->nr_blocks)
			return 0;

		map = &pool->bitmap[pool_idx];

		this_blocks = nr_blocks;
		if (this_blocks + idx > SMALLOC_BPI) {
			this_blocks = SMALLOC_BPI - idx;
			idx = SMALLOC_BPI - this_blocks;
		}

		if (this_blocks == SMALLOC_BPI)
			mask = -1U;
		else
			mask = ((1U << this_blocks) - 1) << idx;

		if (!func(map, mask))
			return 0;

		nr_blocks -= this_blocks;
		idx = 0;
		pool_idx++;
	}

	return 1;
}

static int mask_cmp(unsigned int *map, unsigned int mask)
{
	return !(*map & mask);
}

static int mask_clear(unsigned int *map, unsigned int mask)
{
	assert((*map & mask) == mask);
	*map &= ~mask;
	return 1;
}

static int mask_set(unsigned int *map, unsigned int mask)
{
	assert(!(*map & mask));
	*map |= mask;
	return 1;
}

static int blocks_free(struct pool *pool, unsigned int pool_idx,
		       unsigned int idx, size_t nr_blocks)
{
	return blocks_iter(pool, pool_idx, idx, nr_blocks, mask_cmp);
}

static void set_blocks(struct pool *pool, unsigned int pool_idx,
		       unsigned int idx, size_t nr_blocks)
{
	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_set);
}

static void clear_blocks(struct pool *pool, unsigned int pool_idx,
			 unsigned int idx, size_t nr_blocks)
{
	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_clear);
}

static int find_next_zero(int word, int start)
{
	assert(word != -1U);
	word >>= start;
	return ffz(word) + start;
}

static int add_pool(struct pool *pool, unsigned int alloc_size)
{
	int bitmap_blocks;
	int mmap_flags;
	void *ptr;

#ifdef SMALLOC_REDZONE
	alloc_size += sizeof(unsigned int);
#endif
	alloc_size += sizeof(struct block_hdr);
	if (alloc_size < INITIAL_SIZE)
		alloc_size = INITIAL_SIZE;

	/* round up to nearest full number of blocks */
	alloc_size = (alloc_size + SMALLOC_BPL - 1) & ~(SMALLOC_BPL - 1);
	bitmap_blocks = alloc_size / SMALLOC_BPL;
	alloc_size += bitmap_blocks * sizeof(unsigned int);
	pool->mmap_size = alloc_size;

	pool->nr_blocks = bitmap_blocks;
	pool->free_blocks = bitmap_blocks * SMALLOC_BPB;

	mmap_flags = OS_MAP_ANON;
#ifdef CONFIG_ESX
	mmap_flags |= MAP_PRIVATE;
#else
	mmap_flags |= MAP_SHARED;
#endif
	ptr = mmap(NULL, alloc_size, PROT_READ|PROT_WRITE, mmap_flags, -1, 0);

	if (ptr == MAP_FAILED)
		goto out_fail;

	memset(ptr, 0, alloc_size);
	pool->map = ptr;
	pool->bitmap = (void *) ptr + (pool->nr_blocks * SMALLOC_BPL);

	pool->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
	if (!pool->lock)
		goto out_fail;

	nr_pools++;
	return 0;
out_fail:
	log_err("smalloc: failed adding pool\n");
	if (pool->map)
		munmap(pool->map, pool->mmap_size);
	return 1;
}

void sinit(void)
{
	int ret;

	lock = fio_rwlock_init();
	ret = add_pool(&mp[0], INITIAL_SIZE);
	assert(!ret);
}

static void cleanup_pool(struct pool *pool)
{
	/*
	 * This will also remove the temporary file we used as a backing
	 * store, it was already unlinked
	 */
	munmap(pool->map, pool->mmap_size);

	if (pool->lock)
		fio_mutex_remove(pool->lock);
}

void scleanup(void)
{
	unsigned int i;

	for (i = 0; i < nr_pools; i++)
		cleanup_pool(&mp[i]);

	if (lock)
		fio_rwlock_remove(lock);
}

#ifdef SMALLOC_REDZONE
static void *postred_ptr(struct block_hdr *hdr)
{
	uintptr_t ptr;

	ptr = (uintptr_t) hdr + hdr->size - sizeof(unsigned int);
	ptr = (ptr + int_mask) & ~int_mask;

	return (void *) ptr;
}

static void fill_redzone(struct block_hdr *hdr)
{
	unsigned int *postred = postred_ptr(hdr);

	hdr->prered = SMALLOC_PRE_RED;
	*postred = SMALLOC_POST_RED;
}

static void sfree_check_redzone(struct block_hdr *hdr)
{
	unsigned int *postred = postred_ptr(hdr);

	if (hdr->prered != SMALLOC_PRE_RED) {
		log_err("smalloc pre redzone destroyed!\n"
			" ptr=%p, prered=%x, expected %x\n",
				hdr, hdr->prered, SMALLOC_PRE_RED);
		assert(0);
	}
	if (*postred != SMALLOC_POST_RED) {
		log_err("smalloc post redzone destroyed!\n"
			"  ptr=%p, postred=%x, expected %x\n",
				hdr, *postred, SMALLOC_POST_RED);
		assert(0);
	}
}
#else
static void fill_redzone(struct block_hdr *hdr)
{
}

static void sfree_check_redzone(struct block_hdr *hdr)
{
}
#endif

static void sfree_pool(struct pool *pool, void *ptr)
{
	struct block_hdr *hdr;
	unsigned int i, idx;
	unsigned long offset;

	if (!ptr)
		return;

	ptr -= sizeof(*hdr);
	hdr = ptr;

	assert(ptr_valid(pool, ptr));

	sfree_check_redzone(hdr);

	offset = ptr - pool->map;
	i = offset / SMALLOC_BPL;
	idx = (offset % SMALLOC_BPL) / SMALLOC_BPB;

	pool_lock(pool);
	clear_blocks(pool, i, idx, size_to_blocks(hdr->size));
	if (i < pool->next_non_full)
		pool->next_non_full = i;
	pool->free_blocks += size_to_blocks(hdr->size);
	pool_unlock(pool);
}

void sfree(void *ptr)
{
	struct pool *pool = NULL;
	unsigned int i;

	if (!ptr)
		return;

	global_read_lock();

	for (i = 0; i < nr_pools; i++) {
		if (ptr_valid(&mp[i], ptr)) {
			pool = &mp[i];
			break;
		}
	}

	global_read_unlock();

	assert(pool);
	sfree_pool(pool, ptr);
}

static void *__smalloc_pool(struct pool *pool, size_t size)
{
	size_t nr_blocks;
	unsigned int i;
	unsigned int offset;
	unsigned int last_idx;
	void *ret = NULL;

	pool_lock(pool);

	nr_blocks = size_to_blocks(size);
	if (nr_blocks > pool->free_blocks)
		goto fail;

	i = pool->next_non_full;
	last_idx = 0;
	offset = -1U;
	while (i < pool->nr_blocks) {
		unsigned int idx;

		if (pool->bitmap[i] == -1U) {
			i++;
			pool->next_non_full = i;
			last_idx = 0;
			continue;
		}

		idx = find_next_zero(pool->bitmap[i], last_idx);
		if (!blocks_free(pool, i, idx, nr_blocks)) {
			idx += nr_blocks;
			if (idx < SMALLOC_BPI)
				last_idx = idx;
			else {
				last_idx = 0;
				while (idx >= SMALLOC_BPI) {
					i++;
					idx -= SMALLOC_BPI;
				}
			}
			continue;
		}
		set_blocks(pool, i, idx, nr_blocks);
		offset = i * SMALLOC_BPL + idx * SMALLOC_BPB;
		break;
	}

	if (i < pool->nr_blocks) {
		pool->free_blocks -= nr_blocks;
		ret = pool->map + offset;
	}
fail:
	pool_unlock(pool);
	return ret;
}

static void *smalloc_pool(struct pool *pool, size_t size)
{
	size_t alloc_size = size + sizeof(struct block_hdr);
	void *ptr;

	/*
	 * Round to int alignment, so that the postred pointer will
	 * be naturally aligned as well.
	 */
#ifdef SMALLOC_REDZONE
	alloc_size += sizeof(unsigned int);
	alloc_size = (alloc_size + int_mask) & ~int_mask;
#endif

	ptr = __smalloc_pool(pool, alloc_size);
	if (ptr) {
		struct block_hdr *hdr = ptr;

		hdr->size = alloc_size;
		fill_redzone(hdr);

		ptr += sizeof(*hdr);
		memset(ptr, 0, size);
	}

	return ptr;
}

void *smalloc(size_t size)
{
	unsigned int i;

	if (size != (unsigned int) size)
		return NULL;

	global_write_lock();
	i = last_pool;

	do {
		for (; i < nr_pools; i++) {
			void *ptr = smalloc_pool(&mp[i], size);

			if (ptr) {
				last_pool = i;
				global_write_unlock();
				return ptr;
			}
		}
		if (last_pool) {
			last_pool = 0;
			continue;
		}

		if (nr_pools + 1 > MAX_POOLS)
			break;
		else {
			i = nr_pools;
			if (add_pool(&mp[nr_pools], size))
				goto out;
		}
	} while (1);

out:
	global_write_unlock();
	return NULL;
}

void *scalloc(size_t nmemb, size_t size)
{
	void *ret;

	ret = smalloc(nmemb * size);
	if (ret)
		memset(ret, 0, nmemb * size);

	return ret;
}

char *smalloc_strdup(const char *str)
{
	char *ptr;

	ptr = smalloc(strlen(str) + 1);
	strcpy(ptr, str);
	return ptr;
}
Commit	Line	Data
d24c33a4 JA	1	/*
	2	* simple memory allocator, backed by mmap() so that it hands out memory
	3	* that can be shared across processes and threads
	4	*/
	5	#include <sys/mman.h>
	6	#include <stdio.h>
	7	#include <stdlib.h>
	8	#include <assert.h>
	9	#include <string.h>
	10	#include <unistd.h>
e43606c2	11	#include <inttypes.h>
d24c33a4 JA	12	#include <sys/types.h>
d24c33a4 JA	13	#include <limits.h>
3a8600b4	14	#include <fcntl.h>
d24c33a4	15
6548f47f	16	#include "mutex.h"
b3268b92	17	#include "arch/arch.h"
3a8600b4	18	#include "os/os.h"
10aa136b	19	#include "smalloc.h"
b0f0326a	20	#include "log.h"
d24c33a4	21
55f6491d	22	#define SMALLOC_REDZONE /* define to detect memory corruption */
d24c33a4	23
ec996e9c JA	24	#define SMALLOC_BPB 32 /* block size, bytes-per-bit in bitmap */
	25	#define SMALLOC_BPI (sizeof(unsigned int) * 8)
	26	#define SMALLOC_BPL (SMALLOC_BPB * SMALLOC_BPI)
	27
23bd40f9 JA	28	#define INITIAL_SIZE 1610241024 /* new pool size */
23bd40f9 JA	29	#define MAX_POOLS 1 /* maximum number of pools to setup */
d24c33a4	30
55f6491d JA	31	#define SMALLOC_PRE_RED 0xdeadbeefU
55f6491d JA	32	#define SMALLOC_POST_RED 0x5aa55aa5U
55f6491d	33
2b386d25	34	unsigned int smalloc_pool_size = INITIAL_SIZE;
10aa136b	35	static const int int_mask = sizeof(int) - 1;
2b386d25	36
d24c33a4	37	struct pool {
6548f47f	38	struct fio_mutex lock; / protects this pool */
d24c33a4	39	void map; / map of blocks */
ec996e9c	40	unsigned int bitmap; / blocks free/busy map */
a3ebe7e0 JA	41	size_t free_blocks; /* free blocks */
	42	size_t nr_blocks; /* total blocks */
	43	size_t next_non_full;
	44	size_t mmap_size;
ec996e9c JA	45	};
	46
	47	struct block_hdr {
a3ebe7e0	48	size_t size;
ec996e9c JA	49	#ifdef SMALLOC_REDZONE
	50	unsigned int prered;
	51	#endif
d24c33a4 JA	52	};
	53
	54	static struct pool mp[MAX_POOLS];
	55	static unsigned int nr_pools;
	56	static unsigned int last_pool;
d7df1d13	57	static struct fio_rwlock *lock;
d24c33a4	58
d24c33a4 JA	59	static inline void pool_lock(struct pool *pool)
d24c33a4 JA	60	{
2e3e31e3	61	fio_mutex_down(pool->lock);
d24c33a4 JA	62	}
	63
	64	static inline void pool_unlock(struct pool *pool)
	65	{
2e3e31e3	66	fio_mutex_up(pool->lock);
d24c33a4 JA	67	}
d24c33a4 JA	68
65864cf7	69	static inline void global_read_lock(void)
d24c33a4	70	{
d7df1d13	71	fio_rwlock_read(lock);
d24c33a4 JA	72	}
d24c33a4 JA	73
65864cf7	74	static inline void global_read_unlock(void)
d24c33a4	75	{
d7df1d13	76	fio_rwlock_unlock(lock);
65864cf7 JA	77	}
	78
	79	static inline void global_write_lock(void)
	80	{
d7df1d13	81	fio_rwlock_write(lock);
65864cf7 JA	82	}
	83
	84	static inline void global_write_unlock(void)
	85	{
d7df1d13	86	fio_rwlock_unlock(lock);
d24c33a4 JA	87	}
d24c33a4 JA	88
d24c33a4 JA	89	static inline int ptr_valid(struct pool pool, void ptr)
d24c33a4 JA	90	{
dcb69098	91	unsigned int pool_size = pool->nr_blocks * SMALLOC_BPL;
ec996e9c JA	92
ec996e9c JA	93	return (ptr >= pool->map) && (ptr < pool->map + pool_size);
d24c33a4 JA	94	}
d24c33a4 JA	95
a3ebe7e0	96	static inline size_t size_to_blocks(size_t size)
808e9ea8 JA	97	{
	98	return (size + SMALLOC_BPB - 1) / SMALLOC_BPB;
	99	}
	100
dcb69098	101	static int blocks_iter(struct pool *pool, unsigned int pool_idx,
a3ebe7e0	102	unsigned int idx, size_t nr_blocks,
ec996e9c	103	int (func)(unsigned int map, unsigned int mask))
d24c33a4	104	{
dcb69098	105
ec996e9c JA	106	while (nr_blocks) {
ec996e9c JA	107	unsigned int this_blocks, mask;
dcb69098 JA	108	unsigned int *map;
	109
	110	if (pool_idx >= pool->nr_blocks)
	111	return 0;
	112
	113	map = &pool->bitmap[pool_idx];
ec996e9c JA	114
	115	this_blocks = nr_blocks;
	116	if (this_blocks + idx > SMALLOC_BPI) {
	117	this_blocks = SMALLOC_BPI - idx;
	118	idx = SMALLOC_BPI - this_blocks;
	119	}
	120
	121	if (this_blocks == SMALLOC_BPI)
	122	mask = -1U;
	123	else
	124	mask = ((1U << this_blocks) - 1) << idx;
	125
	126	if (!func(map, mask))
	127	return 0;
	128
	129	nr_blocks -= this_blocks;
	130	idx = 0;
dcb69098	131	pool_idx++;
ec996e9c JA	132	}
	133
	134	return 1;
d24c33a4 JA	135	}
d24c33a4 JA	136
ec996e9c	137	static int mask_cmp(unsigned int *map, unsigned int mask)
d24c33a4	138	{
ec996e9c	139	return !(*map & mask);
d24c33a4 JA	140	}
d24c33a4 JA	141
ec996e9c	142	static int mask_clear(unsigned int *map, unsigned int mask)
d24c33a4	143	{
dcb69098	144	assert((*map & mask) == mask);
ec996e9c JA	145	*map &= ~mask;
ec996e9c JA	146	return 1;
d24c33a4 JA	147	}
d24c33a4 JA	148
ec996e9c	149	static int mask_set(unsigned int *map, unsigned int mask)
d24c33a4	150	{
dcb69098	151	assert(!(*map & mask));
ec996e9c JA	152	*map \|= mask;
ec996e9c JA	153	return 1;
d24c33a4 JA	154	}
d24c33a4 JA	155
dcb69098	156	static int blocks_free(struct pool *pool, unsigned int pool_idx,
a3ebe7e0	157	unsigned int idx, size_t nr_blocks)
d24c33a4	158	{
dcb69098	159	return blocks_iter(pool, pool_idx, idx, nr_blocks, mask_cmp);
d24c33a4 JA	160	}
d24c33a4 JA	161
dcb69098	162	static void set_blocks(struct pool *pool, unsigned int pool_idx,
a3ebe7e0	163	unsigned int idx, size_t nr_blocks)
d24c33a4	164	{
dcb69098	165	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_set);
d24c33a4 JA	166	}
d24c33a4 JA	167
dcb69098	168	static void clear_blocks(struct pool *pool, unsigned int pool_idx,
a3ebe7e0	169	unsigned int idx, size_t nr_blocks)
d24c33a4	170	{
dcb69098	171	blocks_iter(pool, pool_idx, idx, nr_blocks, mask_clear);
d24c33a4 JA	172	}
d24c33a4 JA	173
ec996e9c JA	174	static int find_next_zero(int word, int start)
	175	{
	176	assert(word != -1U);
271067a6 JH	177	word >>= start;
271067a6 JH	178	return ffz(word) + start;
d24c33a4 JA	179	}
d24c33a4 JA	180
adf57099	181	static int add_pool(struct pool *pool, unsigned int alloc_size)
d24c33a4	182	{
8d5844e9	183	int bitmap_blocks;
c8931876	184	int mmap_flags;
b8a6582e	185	void *ptr;
ec996e9c	186
55f6491d	187	#ifdef SMALLOC_REDZONE
ec996e9c	188	alloc_size += sizeof(unsigned int);
55f6491d	189	#endif
ec996e9c JA	190	alloc_size += sizeof(struct block_hdr);
	191	if (alloc_size < INITIAL_SIZE)
	192	alloc_size = INITIAL_SIZE;
	193
	194	/* round up to nearest full number of blocks */
	195	alloc_size = (alloc_size + SMALLOC_BPL - 1) & ~(SMALLOC_BPL - 1);
	196	bitmap_blocks = alloc_size / SMALLOC_BPL;
	197	alloc_size += bitmap_blocks * sizeof(unsigned int);
	198	pool->mmap_size = alloc_size;
0b9d69ec	199
ec996e9c JA	200	pool->nr_blocks = bitmap_blocks;
ec996e9c JA	201	pool->free_blocks = bitmap_blocks * SMALLOC_BPB;
adf57099	202
c8931876 JA	203	mmap_flags = OS_MAP_ANON;
	204	#ifdef CONFIG_ESX
	205	mmap_flags \|= MAP_PRIVATE;
	206	#else
	207	mmap_flags \|= MAP_SHARED;
	208	#endif
	209	ptr = mmap(NULL, alloc_size, PROT_READ\|PROT_WRITE, mmap_flags, -1, 0);
	210
d24c33a4	211	if (ptr == MAP_FAILED)
8d5844e9	212	goto out_fail;
d24c33a4	213
ec996e9c JA	214	memset(ptr, 0, alloc_size);
	215	pool->map = ptr;
	216	pool->bitmap = (void ) ptr + (pool->nr_blocks SMALLOC_BPL);
d24c33a4	217
521da527	218	pool->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
d24c33a4	219	if (!pool->lock)
8d5844e9	220	goto out_fail;
d24c33a4	221
d24c33a4 JA	222	nr_pools++;
d24c33a4 JA	223	return 0;
8d5844e9	224	out_fail:
b0f0326a	225	log_err("smalloc: failed adding pool\n");
d24c33a4	226	if (pool->map)
ec996e9c	227	munmap(pool->map, pool->mmap_size);
d24c33a4 JA	228	return 1;
	229	}
	230
	231	void sinit(void)
	232	{
4d4e80f2	233	int ret;
d24c33a4	234
d7df1d13	235	lock = fio_rwlock_init();
adf57099	236	ret = add_pool(&mp[0], INITIAL_SIZE);
d24c33a4 JA	237	assert(!ret);
	238	}
	239
	240	static void cleanup_pool(struct pool *pool)
	241	{
443bb114 JA	242	/*
	243	* This will also remove the temporary file we used as a backing
	244	* store, it was already unlinked
	245	*/
ec996e9c	246	munmap(pool->map, pool->mmap_size);
6548f47f JA	247
	248	if (pool->lock)
	249	fio_mutex_remove(pool->lock);
d24c33a4 JA	250	}
	251
	252	void scleanup(void)
	253	{
	254	unsigned int i;
	255
	256	for (i = 0; i < nr_pools; i++)
	257	cleanup_pool(&mp[i]);
	258
6548f47f	259	if (lock)
d7df1d13	260	fio_rwlock_remove(lock);
d24c33a4 JA	261	}
d24c33a4 JA	262
89da54e8	263	#ifdef SMALLOC_REDZONE
cf98708d JA	264	static void postred_ptr(struct block_hdr hdr)
cf98708d JA	265	{
e43606c2	266	uintptr_t ptr;
cf98708d	267
e43606c2	268	ptr = (uintptr_t) hdr + hdr->size - sizeof(unsigned int);
cf98708d JA	269	ptr = (ptr + int_mask) & ~int_mask;
	270
	271	return (void *) ptr;
	272	}
	273
ec996e9c	274	static void fill_redzone(struct block_hdr *hdr)
55f6491d	275	{
cf98708d	276	unsigned int *postred = postred_ptr(hdr);
55f6491d	277
ec996e9c JA	278	hdr->prered = SMALLOC_PRE_RED;
ec996e9c JA	279	*postred = SMALLOC_POST_RED;
ec996e9c	280	}
55f6491d	281
ec996e9c JA	282	static void sfree_check_redzone(struct block_hdr *hdr)
ec996e9c JA	283	{
cf98708d	284	unsigned int *postred = postred_ptr(hdr);
ec996e9c JA	285
ec996e9c JA	286	if (hdr->prered != SMALLOC_PRE_RED) {
b0f0326a JA	287	log_err("smalloc pre redzone destroyed!\n"
b0f0326a JA	288	" ptr=%p, prered=%x, expected %x\n",
ec996e9c	289	hdr, hdr->prered, SMALLOC_PRE_RED);
55f6491d JA	290	assert(0);
	291	}
	292	if (*postred != SMALLOC_POST_RED) {
b0f0326a JA	293	log_err("smalloc post redzone destroyed!\n"
b0f0326a JA	294	" ptr=%p, postred=%x, expected %x\n",
ec996e9c	295	hdr, *postred, SMALLOC_POST_RED);
55f6491d JA	296	assert(0);
55f6491d JA	297	}
89da54e8 JA	298	}
	299	#else
	300	static void fill_redzone(struct block_hdr *hdr)
	301	{
55f6491d JA	302	}
55f6491d JA	303
89da54e8 JA	304	static void sfree_check_redzone(struct block_hdr *hdr)
	305	{
	306	}
	307	#endif
	308
d24c33a4 JA	309	static void sfree_pool(struct pool pool, void ptr)
d24c33a4 JA	310	{
ec996e9c	311	struct block_hdr *hdr;
179446e0	312	unsigned int i, idx;
ec996e9c	313	unsigned long offset;
d24c33a4 JA	314
	315	if (!ptr)
	316	return;
	317
ec996e9c JA	318	ptr -= sizeof(*hdr);
ec996e9c JA	319	hdr = ptr;
55f6491d	320
d24c33a4 JA	321	assert(ptr_valid(pool, ptr));
d24c33a4 JA	322
ec996e9c	323	sfree_check_redzone(hdr);
d24c33a4	324
ec996e9c JA	325	offset = ptr - pool->map;
	326	i = offset / SMALLOC_BPL;
	327	idx = (offset % SMALLOC_BPL) / SMALLOC_BPB;
d24c33a4	328
ec996e9c	329	pool_lock(pool);
dcb69098	330	clear_blocks(pool, i, idx, size_to_blocks(hdr->size));
ec996e9c JA	331	if (i < pool->next_non_full)
ec996e9c JA	332	pool->next_non_full = i;
179446e0	333	pool->free_blocks += size_to_blocks(hdr->size);
d24c33a4 JA	334	pool_unlock(pool);
	335	}
	336
	337	void sfree(void *ptr)
	338	{
	339	struct pool *pool = NULL;
	340	unsigned int i;
	341
8e5732e5 JA	342	if (!ptr)
	343	return;
	344
65864cf7	345	global_read_lock();
d24c33a4 JA	346
	347	for (i = 0; i < nr_pools; i++) {
	348	if (ptr_valid(&mp[i], ptr)) {
	349	pool = &mp[i];
	350	break;
	351	}
	352	}
	353
65864cf7	354	global_read_unlock();
d24c33a4 JA	355
	356	assert(pool);
	357	sfree_pool(pool, ptr);
	358	}
	359
a3ebe7e0	360	static void __smalloc_pool(struct pool pool, size_t size)
d24c33a4	361	{
a3ebe7e0	362	size_t nr_blocks;
ec996e9c JA	363	unsigned int i;
	364	unsigned int offset;
	365	unsigned int last_idx;
	366	void *ret = NULL;
d24c33a4	367
d24c33a4	368	pool_lock(pool);
179446e0 JA	369
179446e0 JA	370	nr_blocks = size_to_blocks(size);
ec996e9c	371	if (nr_blocks > pool->free_blocks)
8e5732e5	372	goto fail;
5ec10eaa	373
ec996e9c JA	374	i = pool->next_non_full;
	375	last_idx = 0;
	376	offset = -1U;
	377	while (i < pool->nr_blocks) {
	378	unsigned int idx;
d24c33a4	379
ec996e9c JA	380	if (pool->bitmap[i] == -1U) {
	381	i++;
	382	pool->next_non_full = i;
	383	last_idx = 0;
	384	continue;
	385	}
d24c33a4	386
ec996e9c	387	idx = find_next_zero(pool->bitmap[i], last_idx);
dcb69098	388	if (!blocks_free(pool, i, idx, nr_blocks)) {
ec996e9c JA	389	idx += nr_blocks;
	390	if (idx < SMALLOC_BPI)
	391	last_idx = idx;
	392	else {
	393	last_idx = 0;
	394	while (idx >= SMALLOC_BPI) {
	395	i++;
	396	idx -= SMALLOC_BPI;
	397	}
	398	}
	399	continue;
d24c33a4	400	}
dcb69098	401	set_blocks(pool, i, idx, nr_blocks);
ec996e9c JA	402	offset = i * SMALLOC_BPL + idx * SMALLOC_BPB;
	403	break;
	404	}
	405
	406	if (i < pool->nr_blocks) {
	407	pool->free_blocks -= nr_blocks;
	408	ret = pool->map + offset;
d24c33a4	409	}
ec996e9c	410	fail:
d24c33a4	411	pool_unlock(pool);
ec996e9c	412	return ret;
d24c33a4 JA	413	}
d24c33a4 JA	414
a3ebe7e0	415	static void smalloc_pool(struct pool pool, size_t size)
55f6491d	416	{
a3ebe7e0	417	size_t alloc_size = size + sizeof(struct block_hdr);
55f6491d JA	418	void *ptr;
55f6491d JA	419
cf98708d	420	/*
122426da JA	421	* Round to int alignment, so that the postred pointer will
122426da JA	422	* be naturally aligned as well.
cf98708d	423	*/
ec996e9c	424	#ifdef SMALLOC_REDZONE
122426da JA	425	alloc_size += sizeof(unsigned int);
122426da JA	426	alloc_size = (alloc_size + int_mask) & ~int_mask;
ec996e9c JA	427	#endif
	428
	429	ptr = __smalloc_pool(pool, alloc_size);
89da54e8 JA	430	if (ptr) {
89da54e8 JA	431	struct block_hdr *hdr = ptr;
55f6491d	432
89da54e8 JA	433	hdr->size = alloc_size;
89da54e8 JA	434	fill_redzone(hdr);
55f6491d	435
89da54e8 JA	436	ptr += sizeof(*hdr);
	437	memset(ptr, 0, size);
	438	}
ec996e9c	439
55f6491d	440	return ptr;
55f6491d JA	441	}
55f6491d JA	442
7982aa7d	443	void *smalloc(size_t size)
d24c33a4 JA	444	{
	445	unsigned int i;
	446
7982aa7d JA	447	if (size != (unsigned int) size)
	448	return NULL;
	449
d1271dc1	450	global_write_lock();
d24c33a4 JA	451	i = last_pool;
	452
	453	do {
	454	for (; i < nr_pools; i++) {
	455	void *ptr = smalloc_pool(&mp[i], size);
	456
	457	if (ptr) {
	458	last_pool = i;
d1271dc1	459	global_write_unlock();
d24c33a4 JA	460	return ptr;
	461	}
	462	}
	463	if (last_pool) {
	464	last_pool = 0;
	465	continue;
	466	}
	467
ec996e9c	468	if (nr_pools + 1 > MAX_POOLS)
d24c33a4 JA	469	break;
	470	else {
	471	i = nr_pools;
adf57099	472	if (add_pool(&mp[nr_pools], size))
65864cf7	473	goto out;
d24c33a4 JA	474	}
	475	} while (1);
	476
65864cf7	477	out:
d1271dc1	478	global_write_unlock();
d24c33a4 JA	479	return NULL;
	480	}
	481
544992f7 JA	482	void *scalloc(size_t nmemb, size_t size)
	483	{
	484	void *ret;
	485
	486	ret = smalloc(nmemb * size);
	487	if (ret)
	488	memset(ret, 0, nmemb * size);
	489
	490	return ret;
	491	}
	492
d24c33a4 JA	493	char smalloc_strdup(const char str)
	494	{
	495	char *ptr;
	496
	497	ptr = smalloc(strlen(str) + 1);
	498	strcpy(ptr, str);
	499	return ptr;
	500	}