#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/mempool.h>
#include <linux/slab.h>

#define SG_MEMPOOL_NR		ARRAY_SIZE(sg_pools)
#define SG_MEMPOOL_SIZE		2

struct sg_pool {
	size_t		size;
	char		*name;
	struct kmem_cache	*slab;
	mempool_t	*pool;
};

#define SP(x) { .size = x, "sgpool-" __stringify(x) }
#if (SG_CHUNK_SIZE < 32)
#error SG_CHUNK_SIZE is too small (must be 32 or greater)
#endif
static struct sg_pool sg_pools[] = {
	SP(8),
	SP(16),
#if (SG_CHUNK_SIZE > 32)
	SP(32),
#if (SG_CHUNK_SIZE > 64)
	SP(64),
#if (SG_CHUNK_SIZE > 128)
	SP(128),
#if (SG_CHUNK_SIZE > 256)
#error SG_CHUNK_SIZE is too large (256 MAX)
#endif
#endif
#endif
#endif
	SP(SG_CHUNK_SIZE)
};
#undef SP

static inline unsigned int sg_pool_index(unsigned short nents)
{
	unsigned int index;

	BUG_ON(nents > SG_CHUNK_SIZE);

	if (nents <= 8)
		index = 0;
	else
		index = get_count_order(nents) - 3;

	return index;
}

static void sg_pool_free(struct scatterlist *sgl, unsigned int nents)
{
	struct sg_pool *sgp;

	sgp = sg_pools + sg_pool_index(nents);
	mempool_free(sgl, sgp->pool);
}

static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
{
	struct sg_pool *sgp;

	sgp = sg_pools + sg_pool_index(nents);
	return mempool_alloc(sgp->pool, gfp_mask);
}

/**
 * sg_free_table_chained - Free a previously mapped sg table
 * @table:	The sg table header to use
 * @first_chunk: was first_chunk not NULL in sg_alloc_table_chained?
 *
 *  Description:
 *    Free an sg table previously allocated and setup with
 *    sg_alloc_table_chained().
 *
 **/
void sg_free_table_chained(struct sg_table *table, bool first_chunk)
{
	if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
		return;
	__sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
}
EXPORT_SYMBOL_GPL(sg_free_table_chained);

/**
 * sg_alloc_table_chained - Allocate and chain SGLs in an sg table
 * @table:	The sg table header to use
 * @nents:	Number of entries in sg list
 * @first_chunk: first SGL
 *
 *  Description:
 *    Allocate and chain SGLs in an sg table. If @nents@ is larger than
 *    SG_CHUNK_SIZE a chained sg table will be setup.
 *
 **/
int sg_alloc_table_chained(struct sg_table *table, int nents,
		struct scatterlist *first_chunk)
{
	int ret;

	BUG_ON(!nents);

	if (first_chunk) {
		if (nents <= SG_CHUNK_SIZE) {
			table->nents = table->orig_nents = nents;
			sg_init_table(table->sgl, nents);
			return 0;
		}
	}

	ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
			       first_chunk, GFP_ATOMIC, sg_pool_alloc);
	if (unlikely(ret))
		sg_free_table_chained(table, (bool)first_chunk);
	return ret;
}
EXPORT_SYMBOL_GPL(sg_alloc_table_chained);

static __init int sg_pool_init(void)
{
	int i;

	for (i = 0; i < SG_MEMPOOL_NR; i++) {
		struct sg_pool *sgp = sg_pools + i;
		int size = sgp->size * sizeof(struct scatterlist);

		sgp->slab = kmem_cache_create(sgp->name, size, 0,
				SLAB_HWCACHE_ALIGN, NULL);
		if (!sgp->slab) {
			printk(KERN_ERR "SG_POOL: can't init sg slab %s\n",
					sgp->name);
			goto cleanup_sdb;
		}

		sgp->pool = mempool_create_slab_pool(SG_MEMPOOL_SIZE,
						     sgp->slab);
		if (!sgp->pool) {
			printk(KERN_ERR "SG_POOL: can't init sg mempool %s\n",
					sgp->name);
			goto cleanup_sdb;
		}
	}

	return 0;

cleanup_sdb:
	for (i = 0; i < SG_MEMPOOL_NR; i++) {
		struct sg_pool *sgp = sg_pools + i;
		if (sgp->pool)
			mempool_destroy(sgp->pool);
		if (sgp->slab)
			kmem_cache_destroy(sgp->slab);
	}

	return -ENOMEM;
}

static __exit void sg_pool_exit(void)
{
	int i;

	for (i = 0; i < SG_MEMPOOL_NR; i++) {
		struct sg_pool *sgp = sg_pools + i;
		mempool_destroy(sgp->pool);
		kmem_cache_destroy(sgp->slab);
	}
}

module_init(sg_pool_init);
module_exit(sg_pool_exit);
on value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Richard Guy Briggs &lt;rbriggs@redhat.com&gt;</td><td class='right'>2016-11-29 16:53:23 -0500</td></tr>
<tr><th>committer</th><td>Paul Moore &lt;paul@paul-moore.com&gt;</td><td class='right'>2016-12-14 13:06:04 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f'>55a6f170a413cd8dc7a3a52e5a326e1a87579b4f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f'>3e2336faf3b6e29962b20095df6d3d6c4a415608</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f'>include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=8fae47705685fcaa75a1fe4c8c3e18300a702979'>8fae47705685fcaa75a1fe4c8c3e18300a702979</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f&amp;id2=8fae47705685fcaa75a1fe4c8c3e18300a702979'>diff</a>)</td></tr></table>
<div class='commit-subject'>audit: move kaudit thread start from auditd registration to kaudit init (#2)</div><div class='commit-msg'>Richard made this change some time ago but Eric backed it out because
the rest of the supporting code wasn't ready.  In order to move the
netlink multicast send to kauditd_thread we need to ensure the
kauditd_thread is always running, so restore commit 6ff5e459 ("audit:
move kaudit thread start from auditd registration to kaudit init").

Signed-off-by: Richard Guy Briggs &lt;rbriggs@redhat.com&gt;
[PM: brought forward and merged based on Richard's old patch]
Signed-off-by: Paul Moore &lt;paul@paul-moore.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=55a6f170a413cd8dc7a3a52e5a326e1a87579b4f'>Diffstat</a> (limited to 'include')</div><table summary='diffstat' class='diffstat'>