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55 lines
1.6 KiB
55 lines
1.6 KiB
/* 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 <linux/sched.h>
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#include "internal.h"
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static unsigned long ramfs_mmu_get_unmapped_area(struct file *file,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
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}
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const struct file_operations ramfs_file_operations = {
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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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 = iter_file_splice_write,
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.llseek = generic_file_llseek,
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.get_unmapped_area = ramfs_mmu_get_unmapped_area,
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};
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const struct inode_operations ramfs_file_inode_operations = {
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.setattr = simple_setattr,
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.getattr = simple_getattr,
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};
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