fs/minix/file.c

   1 /*
   2  *  linux/fs/minix/file.c
   3  *
   4  *  Copyright (C) 1991, 1992 Linus Torvalds
   5  *
   6  *  minix regular file handling primitives
   7  */
   8
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/fcntl.h>
  13 #include <linux/stat.h>
  14 #include <linux/locks.h>
  15 #include <linux/mm.h>
  16 #include <linux/pagemap.h>
  17
  18 #include <asm/uaccess.h>
  19 #include <asm/system.h>
  20
  21 #define NBUF    32
  22
  23 #define MIN(a,b) (((a)<(b))?(a):(b))
  24 #define MAX(a,b) (((a)>(b))?(a):(b))
  25
  26 #include <linux/fs.h>
  27
  28 /*
  29  * Write to a file (through the page cache).
  30  */
  31 static ssize_t
  32 minix_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
  33 {
  34         return generic_file_write(file, buf, count,
  35                                   ppos, block_write_partial_page);
  36 }
  37
  38 /*
  39  * We have mostly NULLs here: the current defaults are OK for
  40  * the minix filesystem.
  41  */
  42 static struct file_operations minix_file_operations = {
  43         NULL,                   /* lseek - default */
  44         generic_file_read,      /* read */
  45         minix_file_write,       /* write */
  46         NULL,                   /* readdir - bad */
  47         NULL,                   /* poll - default */
  48         NULL,                   /* ioctl - default */
  49         generic_file_mmap,      /* mmap */
  50         NULL,                   /* no special open is needed */
  51         NULL,                   /* flush */
  52         NULL,                   /* release */
  53         minix_sync_file,        /* fsync */
  54         NULL,                   /* fasync */
  55         NULL,                   /* check_media_change */
  56         NULL                    /* revalidate */
  57 };
  58
  59 struct inode_operations minix_file_inode_operations = {
  60         &minix_file_operations, /* default file operations */
  61         NULL,                   /* create */
  62         NULL,                   /* lookup */
  63         NULL,                   /* link */
  64         NULL,                   /* unlink */
  65         NULL,                   /* symlink */
  66         NULL,                   /* mkdir */
  67         NULL,                   /* rmdir */
  68         NULL,                   /* mknod */
  69         NULL,                   /* rename */
  70         NULL,                   /* readlink */
  71         NULL,                   /* follow_link */
  72         minix_get_block,        /* get_block */
  73         block_read_full_page,   /* readpage */
  74         block_write_full_page,  /* writepage */
  75         block_flushpage,        /* flushpage */
  76         minix_truncate,         /* truncate */
  77         NULL,                   /* permission */
  78         NULL,                   /* smap */
  79         NULL,                   /* revalidate */
  80 };