net/ceph/buffer.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/ceph/ceph_debug.h>
   4
   5 #include <linux/module.h>
   6 #include <linux/slab.h>
   7
   8 #include <linux/ceph/buffer.h>
   9 #include <linux/ceph/decode.h>
  10 #include <linux/ceph/libceph.h> /* for ceph_kvmalloc */
  11
  12 struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
  13 {
  14         struct ceph_buffer *b;
  15
  16         b = kmalloc(sizeof(*b), gfp);
  17         if (!b)
  18                 return NULL;
  19
  20         b->vec.iov_base = ceph_kvmalloc(len, gfp);
  21         if (!b->vec.iov_base) {
  22                 kfree(b);
  23                 return NULL;
  24         }
  25
  26         kref_init(&b->kref);
  27         b->alloc_len = len;
  28         b->vec.iov_len = len;
  29         dout("buffer_new %p\n", b);
  30         return b;
  31 }
  32 EXPORT_SYMBOL(ceph_buffer_new);
  33
  34 void ceph_buffer_release(struct kref *kref)
  35 {
  36         struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
  37
  38         dout("buffer_release %p\n", b);
  39         kvfree(b->vec.iov_base);
  40         kfree(b);
  41 }
  42 EXPORT_SYMBOL(ceph_buffer_release);
  43
  44 int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
  45 {
  46         size_t len;
  47
  48         ceph_decode_need(p, end, sizeof(u32), bad);
  49         len = ceph_decode_32(p);
  50         dout("decode_buffer len %d\n", (int)len);
  51         ceph_decode_need(p, end, len, bad);
  52         *b = ceph_buffer_new(len, GFP_NOFS);
  53         if (!*b)
  54                 return -ENOMEM;
  55         ceph_decode_copy(p, (*b)->vec.iov_base, len);
  56         return 0;
  57 bad:
  58         return -EINVAL;
  59 }