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          = generic_file_fsync,
  30         .splice_read    = generic_file_splice_read,
  31 };
  32
  33 static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
  34 {
  35         struct inode *inode = dentry->d_inode;
  36         int error;
  37
  38         error = inode_change_ok(inode, attr);
  39         if (error)
  40                 return error;
  41
  42         if ((attr->ia_valid & ATTR_SIZE) &&
  43             attr->ia_size != i_size_read(inode)) {
  44                 error = vmtruncate(inode, attr->ia_size);
  45                 if (error)
  46                         return error;
  47         }
  48
  49         setattr_copy(inode, attr);
  50         mark_inode_dirty(inode);
  51         return 0;
  52 }
  53
  54 const struct inode_operations sysv_file_inode_operations = {
  55         .truncate       = sysv_truncate,
  56         .setattr        = sysv_setattr,
  57         .getattr        = sysv_getattr,
  58 };