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 */