rcu: remove all rcu head initializations, except on_stack initializations
[linux-2.6.git] / include / linux / coredump.h
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 {
14         return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
15 }
16
17 static inline int dump_seek(struct file *file, loff_t off)
18 {
19         int ret = 1;
20
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;
34                         if (!dump_write(file, buf, n)) {
35                                 ret = 0;
36                                 break;
37                         }
38                         off -= n;
39                 }
40                 free_page((unsigned long)buf);
41         }
42         return ret;
43 }
44
45 #endif /* _LINUX_COREDUMP_H */