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 kvmalloc */
11
ceph_buffer_new(size_t len,gfp_t gfp)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 = 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
ceph_buffer_release(struct kref * kref)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
ceph_decode_buffer(struct ceph_buffer ** b,void ** p,void * end)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 }
60