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   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         if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
  20                 if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
  21                         return 0;
  22         } else {
  23                 char *buf = (char *)get_zeroed_page(GFP_KERNEL);
  24
  25                 if (!buf)
  26                         return 0;
  27                 while (off > 0) {
  28                         unsigned long n = off;
  29
  30                         if (n > PAGE_SIZE)
  31                                 n = PAGE_SIZE;
  32                         if (!dump_write(file, buf, n))
  33                                 return 0;
  34                         off -= n;
  35                 }
  36                 free_page((unsigned long)buf);
  37         }
  38         return 1;
  39 }
  40
  41 #endif /* _LINUX_COREDUMP_H */