fs/minix/file.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/minix/file.c
   4  *
   5  *  Copyright (C) 1991, 1992 Linus Torvalds
   6  *
   7  *  minix regular file handling primitives
   8  */
   9
  10 #include "minix.h"
  11
  12 /*
  13  * We have mostly NULLs here: the current defaults are OK for
  14  * the minix filesystem.
  15  */
  16 const struct file_operations minix_file_operations = {
  17         .llseek         = generic_file_llseek,
  18         .read_iter      = generic_file_read_iter,
  19         .write_iter     = generic_file_write_iter,
  20         .mmap           = generic_file_mmap,
  21         .fsync          = generic_file_fsync,
  22         .splice_read    = generic_file_splice_read,
  23 };
  24
  25 static int minix_setattr(struct user_namespace *mnt_userns,
  26                          struct dentry *dentry, struct iattr *attr)
  27 {
  28         struct inode *inode = d_inode(dentry);
  29         int error;
  30
  31         error = setattr_prepare(&init_user_ns, dentry, attr);
  32         if (error)
  33                 return error;
  34
  35         if ((attr->ia_valid & ATTR_SIZE) &&
  36             attr->ia_size != i_size_read(inode)) {
  37                 error = inode_newsize_ok(inode, attr->ia_size);
  38                 if (error)
  39                         return error;
  40
  41                 truncate_setsize(inode, attr->ia_size);
  42                 minix_truncate(inode);
  43         }
  44
  45         setattr_copy(&init_user_ns, inode, attr);
  46         mark_inode_dirty(inode);
  47         return 0;
  48 }
  49
  50 const struct inode_operations minix_file_inode_operations = {
  51         .setattr        = minix_setattr,
  52         .getattr        = minix_getattr,
  53 };