LXR linux/net/ceph/buffer.c

   1
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/module.h>
   5#include <linux/slab.h>
   6
   7#include <linux/ceph/buffer.h>
   8#include <linux/ceph/decode.h>
   9#include <linux/ceph/libceph.h> /* for ceph_kvmalloc */
  10
  11struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
  12{
  13        struct ceph_buffer *b;
  14
  15        b = kmalloc(sizeof(*b), gfp);
  16        if (!b)
  17                return NULL;
  18
  19        b->vec.iov_base = ceph_kvmalloc(len, gfp);
  20        if (!b->vec.iov_base) {
  21                kfree(b);
  22                return NULL;
  23        }
  24
  25        kref_init(&b->kref);
  26        b->alloc_len = len;
  27        b->vec.iov_len = len;
  28        dout("buffer_new %p\n", b);
  29        return b;
  30}
  31EXPORT_SYMBOL(ceph_buffer_new);
  32
  33void ceph_buffer_release(struct kref *kref)
  34{
  35        struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
  36
  37        dout("buffer_release %p\n", b);
  38        kvfree(b->vec.iov_base);
  39        kfree(b);
  40}
  41EXPORT_SYMBOL(ceph_buffer_release);
  42
  43int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
  44{
  45        size_t len;
  46
  47        ceph_decode_need(p, end, sizeof(u32), bad);
  48        len = ceph_decode_32(p);
  49        dout("decode_buffer len %d\n", (int)len);
  50        ceph_decode_need(p, end, len, bad);
  51        *b = ceph_buffer_new(len, GFP_NOFS);
  52        if (!*b)
  53                return -ENOMEM;
  54        ceph_decode_copy(p, (*b)->vec.iov_base, len);
  55        return 0;
  56bad:
  57        return -EINVAL;
  58}
  59