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_iter      = generic_file_read_iter,
  25         .write_iter     = generic_file_write_iter,
  26         .mmap           = generic_file_mmap,
  27         .fsync          = generic_file_fsync,
  28         .splice_read    = generic_file_splice_read,
  29 };
  30
  31 static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
  32 {
  33         struct inode *inode = d_inode(dentry);
  34         int error;
  35
  36         error = inode_change_ok(inode, attr);
  37         if (error)
  38                 return error;
  39
  40         if ((attr->ia_valid & ATTR_SIZE) &&
  41             attr->ia_size != i_size_read(inode)) {
  42                 error = inode_newsize_ok(inode, attr->ia_size);
  43                 if (error)
  44                         return error;
  45                 truncate_setsize(inode, attr->ia_size);
  46                 sysv_truncate(inode);
  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         .setattr        = sysv_setattr,
  56         .getattr        = sysv_getattr,
  57 };