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 | |
12 | struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp) |
13 | { |
14 | struct ceph_buffer *b; |
15 | |
16 | b = kmalloc(size: sizeof(*b), flags: gfp); |
17 | if (!b) |
18 | return NULL; |
19 | |
20 | b->vec.iov_base = kvmalloc(size: len, flags: gfp); |
21 | if (!b->vec.iov_base) { |
22 | kfree(objp: b); |
23 | return NULL; |
24 | } |
25 | |
26 | kref_init(kref: &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(addr: b->vec.iov_base); |
40 | kfree(objp: 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, pv: (*b)->vec.iov_base, n: len); |
56 | return 0; |
57 | bad: |
58 | return -EINVAL; |
59 | } |
60 | |