Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1
2#include "ceph_debug.h"
3#include "buffer.h"
4#include "decode.h"
5
6struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
7{
8 struct ceph_buffer *b;
9
10 b = kmalloc(sizeof(*b), gfp);
11 if (!b)
12 return NULL;
13
14 b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
15 if (b->vec.iov_base) {
16 b->is_vmalloc = false;
17 } else {
18 b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
19 if (!b->vec.iov_base) {
20 kfree(b);
21 return NULL;
22 }
23 b->is_vmalloc = true;
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
33void 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 if (b->vec.iov_base) {
39 if (b->is_vmalloc)
40 vfree(b->vec.iov_base);
41 else
42 kfree(b->vec.iov_base);
43 }
44 kfree(b);
45}
46
47int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp)
48{
49 b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
50 if (b->vec.iov_base) {
51 b->is_vmalloc = false;
52 } else {
53 b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
54 b->is_vmalloc = true;
55 }
56 if (!b->vec.iov_base)
57 return -ENOMEM;
58 b->alloc_len = len;
59 b->vec.iov_len = len;
60 return 0;
61}
62
63int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
64{
65 size_t len;
66
67 ceph_decode_need(p, end, sizeof(u32), bad);
68 len = ceph_decode_32(p);
69 dout("decode_buffer len %d\n", (int)len);
70 ceph_decode_need(p, end, len, bad);
71 *b = ceph_buffer_new(len, GFP_NOFS);
72 if (!*b)
73 return -ENOMEM;
74 ceph_decode_copy(p, (*b)->vec.iov_base, len);
75 return 0;
76bad:
77 return -EINVAL;
78}