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Linux/fs/ramfs/file-mmu.c

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  1 /* file-mmu.c: ramfs MMU-based file operations
  2  *
  3  * Resizable simple ram filesystem for Linux.
  4  *
  5  * Copyright (C) 2000 Linus Torvalds.
  6  *               2000 Transmeta Corp.
  7  *
  8  * Usage limits added by David Gibson, Linuxcare Australia.
  9  * This file is released under the GPL.
 10  */
 11 
 12 /*
 13  * NOTE! This filesystem is probably most useful
 14  * not as a real filesystem, but as an example of
 15  * how virtual filesystems can be written.
 16  *
 17  * It doesn't get much simpler than this. Consider
 18  * that this file implements the full semantics of
 19  * a POSIX-compliant read-write filesystem.
 20  *
 21  * Note in particular how the filesystem does not
 22  * need to implement any data structures of its own
 23  * to keep track of the virtual data: using the VFS
 24  * caches is sufficient.
 25  */
 26 
 27 #include <linux/fs.h>
 28 #include <linux/mm.h>
 29 #include <linux/ramfs.h>
 30 
 31 #include "internal.h"
 32 
 33 const struct file_operations ramfs_file_operations = {
 34         .read_iter      = generic_file_read_iter,
 35         .write_iter     = generic_file_write_iter,
 36         .mmap           = generic_file_mmap,
 37         .fsync          = noop_fsync,
 38         .splice_read    = generic_file_splice_read,
 39         .splice_write   = iter_file_splice_write,
 40         .llseek         = generic_file_llseek,
 41 };
 42 
 43 const struct inode_operations ramfs_file_inode_operations = {
 44         .setattr        = simple_setattr,
 45         .getattr        = simple_getattr,
 46 };
 47 

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