fs/sysv/file.c

   1 /*
   2  *  linux/fs/sysv/file.c
   3  *
   4  *  minix/file.c
   5  *  Copyright (C) 1991, 1992  Linus Torvalds
   6  *
   7  *  coh/file.c
   8  *  Copyright (C) 1993  Pascal Haible, Bruno Haible
   9  *
  10  *  sysv/file.c
  11  *  Copyright (C) 1993  Bruno Haible
  12  *
  13  *  SystemV/Coherent regular file handling primitives
  14  */
  15
  16 #include "sysv.h"
  17
  18 /*
  19  * We have mostly NULLs here: the current defaults are OK for
  20  * the coh filesystem.
  21  */
  22 const struct file_operations sysv_file_operations = {
  23         .llseek         = generic_file_llseek,
  24         .read           = do_sync_read,
  25         .aio_read       = generic_file_aio_read,
  26         .write          = do_sync_write,
  27         .aio_write      = generic_file_aio_write,
  28         .mmap           = generic_file_mmap,
  29         .fsync          = sysv_sync_file,
  30         .sendfile       = generic_file_sendfile,
  31 };
  32
  33 struct inode_operations sysv_file_inode_operations = {
  34         .truncate       = sysv_truncate,
  35         .getattr        = sysv_getattr,
  36 };
  37
  38 int sysv_sync_file(struct file * file, struct dentry *dentry, int datasync)
  39 {
  40         struct inode *inode = dentry->d_inode;
  41         int err;
  42
  43         err = sync_mapping_buffers(inode->i_mapping);
  44         if (!(inode->i_state & I_DIRTY))
  45                 return err;
  46         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
  47                 return err;
  48
  49         err |= sysv_sync_inode(inode);
  50         return err ? -EIO : 0;
  51 }