forked from Minki/linux
c30dbb9cc7
struct ceph_buffer is a simple ref-counted buffer. We transparently choose between kmalloc for small buffers and vmalloc for large ones. This is currently used only for allocating memory for xattr data. Signed-off-by: Sage Weil <sage@newdream.net>
35 lines
639 B
C
35 lines
639 B
C
|
|
#include "ceph_debug.h"
|
|
#include "buffer.h"
|
|
|
|
struct ceph_buffer *ceph_buffer_new(gfp_t gfp)
|
|
{
|
|
struct ceph_buffer *b;
|
|
|
|
b = kmalloc(sizeof(*b), gfp);
|
|
if (!b)
|
|
return NULL;
|
|
atomic_set(&b->nref, 1);
|
|
b->vec.iov_base = NULL;
|
|
b->vec.iov_len = 0;
|
|
b->alloc_len = 0;
|
|
return 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;
|
|
}
|
|
|