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1 | #include <linux/uaccess.h> |
2 | #include <linux/export.h> |
3 | #include <linux/uio.h> |
4 | |
5 | /* |
6 | * Copy iovec to kernel. Returns -EFAULT on error. |
7 | * |
8 | * Note: this modifies the original iovec. |
9 | */ |
10 | |
11 | int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len) |
12 | { |
13 | while (len > 0) { |
14 | if (iov->iov_len) { |
15 | int copy = min_t(unsigned int, len, iov->iov_len); |
16 | if (copy_from_user(kdata, iov->iov_base, copy)) |
17 | return -EFAULT; |
18 | len -= copy; |
19 | kdata += copy; |
20 | iov->iov_base += copy; |
21 | iov->iov_len -= copy; |
22 | } |
23 | iov++; |
24 | } |
25 | |
26 | return 0; |
27 | } |
28 | EXPORT_SYMBOL(memcpy_fromiovec); |
29 | |
30 | /* |
31 | * Copy kernel to iovec. Returns -EFAULT on error. |
32 | * |
33 | * Note: this modifies the original iovec. |
34 | */ |
35 | |
36 | int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len) |
37 | { |
38 | while (len > 0) { |
39 | if (iov->iov_len) { |
40 | int copy = min_t(unsigned int, iov->iov_len, len); |
41 | if (copy_to_user(iov->iov_base, kdata, copy)) |
42 | return -EFAULT; |
43 | kdata += copy; |
44 | len -= copy; |
45 | iov->iov_len -= copy; |
46 | iov->iov_base += copy; |
47 | } |
48 | iov++; |
49 | } |
50 | |
51 | return 0; |
52 | } |
53 | EXPORT_SYMBOL(memcpy_toiovec); |
54 | |
55 | /* |
56 | * Copy kernel to iovec. Returns -EFAULT on error. |
57 | */ |
58 | |
59 | int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata, |
60 | int offset, int len) |
61 | { |
62 | int copy; |
63 | for (; len > 0; ++iov) { |
64 | /* Skip over the finished iovecs */ |
65 | if (unlikely(offset >= iov->iov_len)) { |
66 | offset -= iov->iov_len; |
67 | continue; |
68 | } |
69 | copy = min_t(unsigned int, iov->iov_len - offset, len); |
70 | if (copy_to_user(iov->iov_base + offset, kdata, copy)) |
71 | return -EFAULT; |
72 | offset = 0; |
73 | kdata += copy; |
74 | len -= copy; |
75 | } |
76 | |
77 | return 0; |
78 | } |
79 | EXPORT_SYMBOL(memcpy_toiovecend); |
80 | |
81 | /* |
82 | * Copy iovec to kernel. Returns -EFAULT on error. |
83 | */ |
84 | |
85 | int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov, |
86 | int offset, int len) |
87 | { |
88 | /* No data? Done! */ |
89 | if (len == 0) |
90 | return 0; |
91 | |
92 | /* Skip over the finished iovecs */ |
93 | while (offset >= iov->iov_len) { |
94 | offset -= iov->iov_len; |
95 | iov++; |
96 | } |
97 | |
98 | while (len > 0) { |
99 | u8 __user *base = iov->iov_base + offset; |
100 | int copy = min_t(unsigned int, len, iov->iov_len - offset); |
101 | |
102 | offset = 0; |
103 | if (copy_from_user(kdata, base, copy)) |
104 | return -EFAULT; |
105 | len -= copy; |
106 | kdata += copy; |
107 | iov++; |
108 | } |
109 | |
110 | return 0; |
111 | } |
112 | EXPORT_SYMBOL(memcpy_fromiovecend); |
113 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
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