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088e7af7 DH |
1 | #ifndef _LINUX_COREDUMP_H |
2 | #define _LINUX_COREDUMP_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/fs.h> | |
7 | ||
8 | /* | |
9 | * These are the only things you should do on a core-file: use only these | |
10 | * functions to write out all the necessary info. | |
11 | */ | |
12 | static inline int dump_write(struct file *file, const void *addr, int nr) | |
13 | { | |
0eead9ab | 14 | return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
088e7af7 DH |
15 | } |
16 | ||
17 | static inline int dump_seek(struct file *file, loff_t off) | |
18 | { | |
6e3e37a5 AGR |
19 | int ret = 1; |
20 | ||
088e7af7 DH |
21 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { |
22 | if (file->f_op->llseek(file, off, SEEK_CUR) < 0) | |
23 | return 0; | |
24 | } else { | |
25 | char *buf = (char *)get_zeroed_page(GFP_KERNEL); | |
26 | ||
27 | if (!buf) | |
28 | return 0; | |
29 | while (off > 0) { | |
30 | unsigned long n = off; | |
31 | ||
32 | if (n > PAGE_SIZE) | |
33 | n = PAGE_SIZE; | |
6e3e37a5 AGR |
34 | if (!dump_write(file, buf, n)) { |
35 | ret = 0; | |
36 | break; | |
37 | } | |
088e7af7 DH |
38 | off -= n; |
39 | } | |
40 | free_page((unsigned long)buf); | |
41 | } | |
6e3e37a5 | 42 | return ret; |
088e7af7 DH |
43 | } |
44 | ||
45 | #endif /* _LINUX_COREDUMP_H */ |