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Commit | Line | Data |
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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_kvmalloc */ | |
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 | 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 | } |