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#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;
}
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