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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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