LXR linux/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
  12struct 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}
  32EXPORT_SYMBOL(ceph_buffer_new);
  33
  34void 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}
  42EXPORT_SYMBOL(ceph_buffer_release);
  43
  44int 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;
  57bad:
  58        return -EINVAL;
  59}
  60