fs/minix/file.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  linux/fs/minix/file.c
0004  *
0005  *  Copyright (C) 1991, 1992 Linus Torvalds
0006  *
0007  *  minix regular file handling primitives
0008  */
0009
0010 #include "minix.h"
0011
0012 /*
0013  * We have mostly NULLs here: the current defaults are OK for
0014  * the minix filesystem.
0015  */
0016 const struct file_operations minix_file_operations = {
0017     .llseek     = generic_file_llseek,
0018     .read_iter  = generic_file_read_iter,
0019     .write_iter = generic_file_write_iter,
0020     .mmap       = generic_file_mmap,
0021     .fsync      = generic_file_fsync,
0022     .splice_read    = generic_file_splice_read,
0023 };
0024
0025 static int minix_setattr(struct user_namespace *mnt_userns,
0026              struct dentry *dentry, struct iattr *attr)
0027 {
0028     struct inode *inode = d_inode(dentry);
0029     int error;
0030
0031     error = setattr_prepare(&init_user_ns, dentry, attr);
0032     if (error)
0033         return error;
0034
0035     if ((attr->ia_valid & ATTR_SIZE) &&
0036         attr->ia_size != i_size_read(inode)) {
0037         error = inode_newsize_ok(inode, attr->ia_size);
0038         if (error)
0039             return error;
0040
0041         truncate_setsize(inode, attr->ia_size);
0042         minix_truncate(inode);
0043     }
0044
0045     setattr_copy(&init_user_ns, inode, attr);
0046     mark_inode_dirty(inode);
0047     return 0;
0048 }
0049
0050 const struct inode_operations minix_file_inode_operations = {
0051     .setattr    = minix_setattr,
0052     .getattr    = minix_getattr,
0053 };