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
10 struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
11 {
12 struct ceph_buffer *b;
13
14 b = kmalloc(sizeof(*b), gfp);
15 if (!b)
16 return NULL;
17
18 b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
19 if (b->vec.iov_base) {
20 b->is_vmalloc = false;
21 } else {
22 b->vec.iov_base = __vmalloc(len, gfp | __GFP_HIGHMEM, PAGE_KERNEL);
23 if (!b->vec.iov_base) {
24 kfree(b);
25 return NULL;
26 }
27 b->is_vmalloc = true;
28 }
29
30 kref_init(&b->kref);
31 b->alloc_len = len;
32 b->vec.iov_len = len;
33 dout("buffer_new %p\n", b);
34 return b;
35 }
36 EXPORT_SYMBOL(ceph_buffer_new);
37
38 void ceph_buffer_release(struct kref *kref)
39 {
40 struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
41
42 dout("buffer_release %p\n", b);
43 if (b->vec.iov_base) {
44 if (b->is_vmalloc)
45 vfree(b->vec.iov_base);
46 else
47 kfree(b->vec.iov_base);
48 }
49 kfree(b);
50 }
51 EXPORT_SYMBOL(ceph_buffer_release);
52
53 int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
54 {
55 size_t len;
56
57 ceph_decode_need(p, end, sizeof(u32), bad);
58 len = ceph_decode_32(p);
59 dout("decode_buffer len %d\n", (int)len);
60 ceph_decode_need(p, end, len, bad);
61 *b = ceph_buffer_new(len, GFP_NOFS);
62 if (!*b)
63 return -ENOMEM;
64 ceph_decode_copy(p, (*b)->vec.iov_base, len);
65 return 0;
66 bad:
67 return -EINVAL;
68 }
69
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.