#include <linux/ceph/ceph_debug.h> #include <linux/module.h>#include <linux/slab.h> #include <linux/ceph/buffer.h>#include <linux/ceph/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 | __GFP_HIGHMEM, 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;}EXPORT_SYMBOL(ceph_buffer_new); 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);}EXPORT_SYMBOL(ceph_buffer_release); 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;}