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_kv{malloc,free} */
  10
  11 struct 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 }
  31 EXPORT_SYMBOL(ceph_buffer_new);
  32
  33 void 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         ceph_kvfree(b->vec.iov_base);
  39         kfree(b);
  40 }
  41 EXPORT_SYMBOL(ceph_buffer_release);
  42
  43 int 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;
  56 bad:
  57         return -EINVAL;
  58 }