543ade1fc9
This patch cleans up generic_file_*_read/write() interfaces. Christoph Hellwig gave me the idea for this clean ups. In a nutshell, all filesystems should set .aio_read/.aio_write methods and use do_sync_read/ do_sync_write() as their .read/.write methods. This allows us to cleanup all variants of generic_file_* routines. Final available interfaces: generic_file_aio_read() - read handler generic_file_aio_write() - write handler generic_file_aio_write_nolock() - no lock write handler __generic_file_aio_write_nolock() - internal worker routine Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* file-mmu.c: ramfs MMU-based file operations
|
|
*
|
|
* Resizable simple ram filesystem for Linux.
|
|
*
|
|
* Copyright (C) 2000 Linus Torvalds.
|
|
* 2000 Transmeta Corp.
|
|
*
|
|
* Usage limits added by David Gibson, Linuxcare Australia.
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
/*
|
|
* NOTE! This filesystem is probably most useful
|
|
* not as a real filesystem, but as an example of
|
|
* how virtual filesystems can be written.
|
|
*
|
|
* It doesn't get much simpler than this. Consider
|
|
* that this file implements the full semantics of
|
|
* a POSIX-compliant read-write filesystem.
|
|
*
|
|
* Note in particular how the filesystem does not
|
|
* need to implement any data structures of its own
|
|
* to keep track of the virtual data: using the VFS
|
|
* caches is sufficient.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
|
|
const struct address_space_operations ramfs_aops = {
|
|
.readpage = simple_readpage,
|
|
.prepare_write = simple_prepare_write,
|
|
.commit_write = simple_commit_write
|
|
};
|
|
|
|
const struct file_operations ramfs_file_operations = {
|
|
.read = do_sync_read,
|
|
.aio_read = generic_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = generic_file_aio_write,
|
|
.mmap = generic_file_mmap,
|
|
.fsync = simple_sync_file,
|
|
.sendfile = generic_file_sendfile,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
struct inode_operations ramfs_file_inode_operations = {
|
|
.getattr = simple_getattr,
|
|
};
|