[linux-2.6-block.git] / fs / ceph / buffer.c


#include "ceph_debug.h"

#include <linux/slab.h>

#include "buffer.h"
#include "decode.h"

struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
{
	struct ceph_buffer *b;

	b = kmalloc(sizeof(*b), gfp);
	if (!b)
		return NULL;

	b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
	if (b->vec.iov_base) {
		b->is_vmalloc = false;
	} else {
		b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
		if (!b->vec.iov_base) {
			kfree(b);
			return NULL;
		}
		b->is_vmalloc = true;
	}

	kref_init(&b->kref);
	b->alloc_len = len;
	b->vec.iov_len = len;
	dout("buffer_new %p\n", b);
	return b;
}

void ceph_buffer_release(struct kref *kref)
{
	struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);

	dout("buffer_release %p\n", b);
	if (b->vec.iov_base) {
		if (b->is_vmalloc)
			vfree(b->vec.iov_base);
		else
			kfree(b->vec.iov_base);
	}
	kfree(b);
}

int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp)
{
	b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
	if (b->vec.iov_base) {
		b->is_vmalloc = false;
	} else {
		b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
		b->is_vmalloc = true;
	}
	if (!b->vec.iov_base)
		return -ENOMEM;
	b->alloc_len = len;
	b->vec.iov_len = len;
	return 0;
}

int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
{
	size_t len;

	ceph_decode_need(p, end, sizeof(u32), bad);
	len = ceph_decode_32(p);
	dout("decode_buffer len %d\n", (int)len);
	ceph_decode_need(p, end, len, bad);
	*b = ceph_buffer_new(len, GFP_NOFS);
	if (!*b)
		return -ENOMEM;
	ceph_decode_copy(p, (*b)->vec.iov_base, len);
	return 0;
bad:
	return -EINVAL;
}
Commit	Line	Data
c30dbb9c SW	1
c30dbb9c SW	2	#include "ceph_debug.h"
5a0e3ad6 TH	3
	4	#include <linux/slab.h>
	5
c30dbb9c	6	#include "buffer.h"
c7e337d6	7	#include "decode.h"
c30dbb9c	8
b6c1d5b8	9	struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
c30dbb9c SW	10	{
	11	struct ceph_buffer *b;
	12
	13	b = kmalloc(sizeof(*b), gfp);
	14	if (!b)
	15	return NULL;
b6c1d5b8 SW	16
	17	b->vec.iov_base = kmalloc(len, gfp \| __GFP_NOWARN);
	18	if (b->vec.iov_base) {
	19	b->is_vmalloc = false;
	20	} else {
	21	b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
	22	if (!b->vec.iov_base) {
	23	kfree(b);
	24	return NULL;
	25	}
	26	b->is_vmalloc = true;
	27	}
	28
dd26d857	29	kref_init(&b->kref);
b6c1d5b8 SW	30	b->alloc_len = len;
	31	b->vec.iov_len = len;
	32	dout("buffer_new %p\n", b);
c30dbb9c SW	33	return b;
	34	}
	35
dd26d857 SW	36	void ceph_buffer_release(struct kref *kref)
	37	{
	38	struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
b6c1d5b8 SW	39
b6c1d5b8 SW	40	dout("buffer_release %p\n", b);
dd26d857 SW	41	if (b->vec.iov_base) {
	42	if (b->is_vmalloc)
	43	vfree(b->vec.iov_base);
	44	else
	45	kfree(b->vec.iov_base);
	46	}
	47	kfree(b);
	48	}
	49
c30dbb9c SW	50	int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp)
	51	{
	52	b->vec.iov_base = kmalloc(len, gfp \| __GFP_NOWARN);
	53	if (b->vec.iov_base) {
	54	b->is_vmalloc = false;
	55	} else {
	56	b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
	57	b->is_vmalloc = true;
	58	}
	59	if (!b->vec.iov_base)
	60	return -ENOMEM;
	61	b->alloc_len = len;
	62	b->vec.iov_len = len;
	63	return 0;
	64	}
	65
c7e337d6 SW	66	int ceph_decode_buffer(struct ceph_buffer b, void p, void *end)
	67	{
	68	size_t len;
	69
	70	ceph_decode_need(p, end, sizeof(u32), bad);
	71	len = ceph_decode_32(p);
	72	dout("decode_buffer len %d\n", (int)len);
	73	ceph_decode_need(p, end, len, bad);
	74	*b = ceph_buffer_new(len, GFP_NOFS);
	75	if (!*b)
	76	return -ENOMEM;
	77	ceph_decode_copy(p, (*b)->vec.iov_base, len);
	78	return 0;
	79	bad:
	80	return -EINVAL;
	81	}