1b061d9247
We don't name our generic fsync implementations very well currently. The no-op implementation for in-memory filesystems currently is called simple_sync_file which doesn't make too much sense to start with, the the generic one for simple filesystems is called simple_fsync which can lead to some confusion. This patch renames the generic file fsync method to generic_file_fsync to match the other generic_file_* routines it is supposed to be used with, and the no-op implementation to noop_fsync to make it obvious what to expect. In addition add some documentation for both methods. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* file-mmu.c: ramfs MMU-based file operations
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*
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* Resizable simple ram filesystem for Linux.
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*
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* Copyright (C) 2000 Linus Torvalds.
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* 2000 Transmeta Corp.
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*
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* Usage limits added by David Gibson, Linuxcare Australia.
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* This file is released under the GPL.
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*/
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/*
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* NOTE! This filesystem is probably most useful
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* not as a real filesystem, but as an example of
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* how virtual filesystems can be written.
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*
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* It doesn't get much simpler than this. Consider
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* that this file implements the full semantics of
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* a POSIX-compliant read-write filesystem.
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*
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* Note in particular how the filesystem does not
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* need to implement any data structures of its own
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* to keep track of the virtual data: using the VFS
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* caches is sufficient.
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/ramfs.h>
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#include "internal.h"
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const struct address_space_operations ramfs_aops = {
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.readpage = simple_readpage,
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.write_begin = simple_write_begin,
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.write_end = simple_write_end,
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.set_page_dirty = __set_page_dirty_no_writeback,
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};
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const struct file_operations ramfs_file_operations = {
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.write = do_sync_write,
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.aio_write = generic_file_aio_write,
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.mmap = generic_file_mmap,
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.fsync = noop_fsync,
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.splice_read = generic_file_splice_read,
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.splice_write = generic_file_splice_write,
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.llseek = generic_file_llseek,
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};
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const struct inode_operations ramfs_file_inode_operations = {
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.getattr = simple_getattr,
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};
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