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663 lines
15 KiB
C
663 lines
15 KiB
C
/* Block- or MTD-based romfs
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*
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* Copyright © 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* Derived from: ROMFS file system, Linux implementation
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*
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* Copyright © 1997-1999 Janos Farkas <chexum@shadow.banki.hu>
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*
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* Using parts of the minix filesystem
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* Copyright © 1991, 1992 Linus Torvalds
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*
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* and parts of the affs filesystem additionally
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* Copyright © 1993 Ray Burr
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* Copyright © 1996 Hans-Joachim Widmaier
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*
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* Changes
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* Changed for 2.1.19 modules
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* Jan 1997 Initial release
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* Jun 1997 2.1.43+ changes
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* Proper page locking in readpage
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* Changed to work with 2.1.45+ fs
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* Jul 1997 Fixed follow_link
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* 2.1.47
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* lookup shouldn't return -ENOENT
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* from Horst von Brand:
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* fail on wrong checksum
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* double unlock_super was possible
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* correct namelen for statfs
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* spotted by Bill Hawes:
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* readlink shouldn't iput()
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* Jun 1998 2.1.106 from Avery Pennarun: glibc scandir()
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* exposed a problem in readdir
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* 2.1.107 code-freeze spellchecker run
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* Aug 1998 2.1.118+ VFS changes
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* Sep 1998 2.1.122 another VFS change (follow_link)
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* Apr 1999 2.2.7 no more EBADF checking in
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* lookup/readdir, use ERR_PTR
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* Jun 1999 2.3.6 d_alloc_root use changed
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* 2.3.9 clean up usage of ENOENT/negative
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* dentries in lookup
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* clean up page flags setting
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* (error, uptodate, locking) in
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* in readpage
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* use init_special_inode for
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* fifos/sockets (and streamline) in
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* read_inode, fix _ops table order
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* Aug 1999 2.3.16 __initfunc() => __init change
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* Oct 1999 2.3.24 page->owner hack obsoleted
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* Nov 1999 2.3.27 2.3.25+ page->offset => index change
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/statfs.h>
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#include <linux/mtd/super.h>
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#include <linux/ctype.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/uaccess.h>
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#include <linux/major.h>
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#include "internal.h"
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static struct kmem_cache *romfs_inode_cachep;
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static const umode_t romfs_modemap[8] = {
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0, /* hard link */
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S_IFDIR | 0644, /* directory */
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S_IFREG | 0644, /* regular file */
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S_IFLNK | 0777, /* symlink */
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S_IFBLK | 0600, /* blockdev */
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S_IFCHR | 0600, /* chardev */
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S_IFSOCK | 0644, /* socket */
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S_IFIFO | 0644 /* FIFO */
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};
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static const unsigned char romfs_dtype_table[] = {
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DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_SOCK, DT_FIFO
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};
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static struct inode *romfs_iget(struct super_block *sb, unsigned long pos);
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/*
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* read a page worth of data from the image
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*/
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static int romfs_readpage(struct file *file, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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loff_t offset, size;
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unsigned long fillsize, pos;
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void *buf;
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int ret;
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buf = kmap(page);
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if (!buf)
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return -ENOMEM;
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/* 32 bit warning -- but not for us :) */
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offset = page_offset(page);
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size = i_size_read(inode);
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fillsize = 0;
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ret = 0;
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if (offset < size) {
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size -= offset;
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fillsize = size > PAGE_SIZE ? PAGE_SIZE : size;
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pos = ROMFS_I(inode)->i_dataoffset + offset;
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ret = romfs_dev_read(inode->i_sb, pos, buf, fillsize);
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if (ret < 0) {
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SetPageError(page);
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fillsize = 0;
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ret = -EIO;
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}
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}
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if (fillsize < PAGE_SIZE)
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memset(buf + fillsize, 0, PAGE_SIZE - fillsize);
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if (ret == 0)
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SetPageUptodate(page);
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flush_dcache_page(page);
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kunmap(page);
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unlock_page(page);
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return ret;
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}
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static const struct address_space_operations romfs_aops = {
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.readpage = romfs_readpage
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};
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/*
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* read the entries from a directory
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*/
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static int romfs_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *i = file_inode(file);
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struct romfs_inode ri;
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unsigned long offset, maxoff;
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int j, ino, nextfh;
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char fsname[ROMFS_MAXFN]; /* XXX dynamic? */
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int ret;
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maxoff = romfs_maxsize(i->i_sb);
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offset = ctx->pos;
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if (!offset) {
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offset = i->i_ino & ROMFH_MASK;
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ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
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if (ret < 0)
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goto out;
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offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
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}
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/* Not really failsafe, but we are read-only... */
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for (;;) {
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if (!offset || offset >= maxoff) {
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offset = maxoff;
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ctx->pos = offset;
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goto out;
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}
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ctx->pos = offset;
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/* Fetch inode info */
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ret = romfs_dev_read(i->i_sb, offset, &ri, ROMFH_SIZE);
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if (ret < 0)
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goto out;
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j = romfs_dev_strnlen(i->i_sb, offset + ROMFH_SIZE,
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sizeof(fsname) - 1);
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if (j < 0)
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goto out;
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ret = romfs_dev_read(i->i_sb, offset + ROMFH_SIZE, fsname, j);
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if (ret < 0)
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goto out;
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fsname[j] = '\0';
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ino = offset;
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nextfh = be32_to_cpu(ri.next);
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if ((nextfh & ROMFH_TYPE) == ROMFH_HRD)
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ino = be32_to_cpu(ri.spec);
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if (!dir_emit(ctx, fsname, j, ino,
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romfs_dtype_table[nextfh & ROMFH_TYPE]))
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goto out;
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offset = nextfh & ROMFH_MASK;
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}
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out:
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return 0;
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}
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/*
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* look up an entry in a directory
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*/
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static struct dentry *romfs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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unsigned long offset, maxoff;
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struct inode *inode = NULL;
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struct romfs_inode ri;
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const char *name; /* got from dentry */
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int len, ret;
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offset = dir->i_ino & ROMFH_MASK;
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ret = romfs_dev_read(dir->i_sb, offset, &ri, ROMFH_SIZE);
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if (ret < 0)
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goto error;
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/* search all the file entries in the list starting from the one
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* pointed to by the directory's special data */
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maxoff = romfs_maxsize(dir->i_sb);
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offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
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name = dentry->d_name.name;
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len = dentry->d_name.len;
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for (;;) {
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if (!offset || offset >= maxoff)
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break;
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ret = romfs_dev_read(dir->i_sb, offset, &ri, sizeof(ri));
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if (ret < 0)
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goto error;
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/* try to match the first 16 bytes of name */
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ret = romfs_dev_strcmp(dir->i_sb, offset + ROMFH_SIZE, name,
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len);
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if (ret < 0)
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goto error;
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if (ret == 1) {
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/* Hard link handling */
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if ((be32_to_cpu(ri.next) & ROMFH_TYPE) == ROMFH_HRD)
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offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
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inode = romfs_iget(dir->i_sb, offset);
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break;
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}
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/* next entry */
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offset = be32_to_cpu(ri.next) & ROMFH_MASK;
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}
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return d_splice_alias(inode, dentry);
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error:
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return ERR_PTR(ret);
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}
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static const struct file_operations romfs_dir_operations = {
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.read = generic_read_dir,
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.iterate_shared = romfs_readdir,
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.llseek = generic_file_llseek,
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};
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static const struct inode_operations romfs_dir_inode_operations = {
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.lookup = romfs_lookup,
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};
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/*
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* get a romfs inode based on its position in the image (which doubles as the
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* inode number)
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*/
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static struct inode *romfs_iget(struct super_block *sb, unsigned long pos)
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{
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struct romfs_inode_info *inode;
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struct romfs_inode ri;
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struct inode *i;
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unsigned long nlen;
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unsigned nextfh;
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int ret;
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umode_t mode;
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/* we might have to traverse a chain of "hard link" file entries to get
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* to the actual file */
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for (;;) {
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ret = romfs_dev_read(sb, pos, &ri, sizeof(ri));
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if (ret < 0)
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goto error;
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/* XXX: do romfs_checksum here too (with name) */
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nextfh = be32_to_cpu(ri.next);
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if ((nextfh & ROMFH_TYPE) != ROMFH_HRD)
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break;
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pos = be32_to_cpu(ri.spec) & ROMFH_MASK;
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}
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/* determine the length of the filename */
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nlen = romfs_dev_strnlen(sb, pos + ROMFH_SIZE, ROMFS_MAXFN);
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if (IS_ERR_VALUE(nlen))
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goto eio;
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/* get an inode for this image position */
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i = iget_locked(sb, pos);
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if (!i)
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return ERR_PTR(-ENOMEM);
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if (!(i->i_state & I_NEW))
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return i;
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/* precalculate the data offset */
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inode = ROMFS_I(i);
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inode->i_metasize = (ROMFH_SIZE + nlen + 1 + ROMFH_PAD) & ROMFH_MASK;
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inode->i_dataoffset = pos + inode->i_metasize;
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set_nlink(i, 1); /* Hard to decide.. */
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i->i_size = be32_to_cpu(ri.size);
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i->i_mtime.tv_sec = i->i_atime.tv_sec = i->i_ctime.tv_sec = 0;
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i->i_mtime.tv_nsec = i->i_atime.tv_nsec = i->i_ctime.tv_nsec = 0;
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/* set up mode and ops */
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mode = romfs_modemap[nextfh & ROMFH_TYPE];
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switch (nextfh & ROMFH_TYPE) {
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case ROMFH_DIR:
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i->i_size = ROMFS_I(i)->i_metasize;
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i->i_op = &romfs_dir_inode_operations;
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i->i_fop = &romfs_dir_operations;
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if (nextfh & ROMFH_EXEC)
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mode |= S_IXUGO;
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break;
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case ROMFH_REG:
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i->i_fop = &romfs_ro_fops;
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i->i_data.a_ops = &romfs_aops;
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if (nextfh & ROMFH_EXEC)
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mode |= S_IXUGO;
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break;
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case ROMFH_SYM:
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i->i_op = &page_symlink_inode_operations;
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inode_nohighmem(i);
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i->i_data.a_ops = &romfs_aops;
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mode |= S_IRWXUGO;
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break;
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default:
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/* depending on MBZ for sock/fifos */
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nextfh = be32_to_cpu(ri.spec);
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init_special_inode(i, mode, MKDEV(nextfh >> 16,
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nextfh & 0xffff));
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break;
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}
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i->i_mode = mode;
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unlock_new_inode(i);
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return i;
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eio:
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ret = -EIO;
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error:
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pr_err("read error for inode 0x%lx\n", pos);
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return ERR_PTR(ret);
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}
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/*
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* allocate a new inode
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*/
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static struct inode *romfs_alloc_inode(struct super_block *sb)
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{
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struct romfs_inode_info *inode;
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inode = kmem_cache_alloc(romfs_inode_cachep, GFP_KERNEL);
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return inode ? &inode->vfs_inode : NULL;
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}
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/*
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* return a spent inode to the slab cache
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*/
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static void romfs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode));
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}
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static void romfs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, romfs_i_callback);
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}
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/*
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* get filesystem statistics
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*/
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static int romfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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u64 id = 0;
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/* When calling huge_encode_dev(),
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* use sb->s_bdev->bd_dev when,
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* - CONFIG_ROMFS_ON_BLOCK defined
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* use sb->s_dev when,
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* - CONFIG_ROMFS_ON_BLOCK undefined and
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* - CONFIG_ROMFS_ON_MTD defined
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* leave id as 0 when,
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* - CONFIG_ROMFS_ON_BLOCK undefined and
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* - CONFIG_ROMFS_ON_MTD undefined
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*/
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if (sb->s_bdev)
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id = huge_encode_dev(sb->s_bdev->bd_dev);
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else if (sb->s_dev)
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id = huge_encode_dev(sb->s_dev);
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buf->f_type = ROMFS_MAGIC;
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buf->f_namelen = ROMFS_MAXFN;
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buf->f_bsize = ROMBSIZE;
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buf->f_bfree = buf->f_bavail = buf->f_ffree;
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buf->f_blocks =
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(romfs_maxsize(dentry->d_sb) + ROMBSIZE - 1) >> ROMBSBITS;
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buf->f_fsid.val[0] = (u32)id;
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buf->f_fsid.val[1] = (u32)(id >> 32);
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return 0;
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}
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/*
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* remounting must involve read-only
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*/
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static int romfs_remount(struct super_block *sb, int *flags, char *data)
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{
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sync_filesystem(sb);
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*flags |= SB_RDONLY;
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return 0;
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}
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static const struct super_operations romfs_super_ops = {
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.alloc_inode = romfs_alloc_inode,
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.destroy_inode = romfs_destroy_inode,
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.statfs = romfs_statfs,
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.remount_fs = romfs_remount,
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};
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/*
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* checksum check on part of a romfs filesystem
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*/
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static __u32 romfs_checksum(const void *data, int size)
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{
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const __be32 *ptr = data;
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__u32 sum;
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sum = 0;
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size >>= 2;
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while (size > 0) {
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sum += be32_to_cpu(*ptr++);
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size--;
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}
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return sum;
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}
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/*
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* fill in the superblock
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*/
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static int romfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct romfs_super_block *rsb;
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struct inode *root;
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unsigned long pos, img_size;
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const char *storage;
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size_t len;
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int ret;
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#ifdef CONFIG_BLOCK
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if (!sb->s_mtd) {
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sb_set_blocksize(sb, ROMBSIZE);
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} else {
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sb->s_blocksize = ROMBSIZE;
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sb->s_blocksize_bits = blksize_bits(ROMBSIZE);
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}
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#endif
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sb->s_maxbytes = 0xFFFFFFFF;
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sb->s_magic = ROMFS_MAGIC;
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sb->s_flags |= SB_RDONLY | SB_NOATIME;
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sb->s_op = &romfs_super_ops;
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#ifdef CONFIG_ROMFS_ON_MTD
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/* Use same dev ID from the underlying mtdblock device */
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if (sb->s_mtd)
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sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, sb->s_mtd->index);
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#endif
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/* read the image superblock and check it */
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rsb = kmalloc(512, GFP_KERNEL);
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if (!rsb)
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return -ENOMEM;
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sb->s_fs_info = (void *) 512;
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ret = romfs_dev_read(sb, 0, rsb, 512);
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if (ret < 0)
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goto error_rsb;
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img_size = be32_to_cpu(rsb->size);
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if (sb->s_mtd && img_size > sb->s_mtd->size)
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goto error_rsb_inval;
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sb->s_fs_info = (void *) img_size;
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if (rsb->word0 != ROMSB_WORD0 || rsb->word1 != ROMSB_WORD1 ||
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img_size < ROMFH_SIZE) {
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if (!silent)
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pr_warn("VFS: Can't find a romfs filesystem on dev %s.\n",
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sb->s_id);
|
|
goto error_rsb_inval;
|
|
}
|
|
|
|
if (romfs_checksum(rsb, min_t(size_t, img_size, 512))) {
|
|
pr_err("bad initial checksum on dev %s.\n", sb->s_id);
|
|
goto error_rsb_inval;
|
|
}
|
|
|
|
storage = sb->s_mtd ? "MTD" : "the block layer";
|
|
|
|
len = strnlen(rsb->name, ROMFS_MAXFN);
|
|
if (!silent)
|
|
pr_notice("Mounting image '%*.*s' through %s\n",
|
|
(unsigned) len, (unsigned) len, rsb->name, storage);
|
|
|
|
kfree(rsb);
|
|
rsb = NULL;
|
|
|
|
/* find the root directory */
|
|
pos = (ROMFH_SIZE + len + 1 + ROMFH_PAD) & ROMFH_MASK;
|
|
|
|
root = romfs_iget(sb, pos);
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
|
|
error_rsb_inval:
|
|
ret = -EINVAL;
|
|
error_rsb:
|
|
kfree(rsb);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* get a superblock for mounting
|
|
*/
|
|
static struct dentry *romfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name,
|
|
void *data)
|
|
{
|
|
struct dentry *ret = ERR_PTR(-EINVAL);
|
|
|
|
#ifdef CONFIG_ROMFS_ON_MTD
|
|
ret = mount_mtd(fs_type, flags, dev_name, data, romfs_fill_super);
|
|
#endif
|
|
#ifdef CONFIG_ROMFS_ON_BLOCK
|
|
if (ret == ERR_PTR(-EINVAL))
|
|
ret = mount_bdev(fs_type, flags, dev_name, data,
|
|
romfs_fill_super);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* destroy a romfs superblock in the appropriate manner
|
|
*/
|
|
static void romfs_kill_sb(struct super_block *sb)
|
|
{
|
|
#ifdef CONFIG_ROMFS_ON_MTD
|
|
if (sb->s_mtd) {
|
|
kill_mtd_super(sb);
|
|
return;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_ROMFS_ON_BLOCK
|
|
if (sb->s_bdev) {
|
|
kill_block_super(sb);
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static struct file_system_type romfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "romfs",
|
|
.mount = romfs_mount,
|
|
.kill_sb = romfs_kill_sb,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("romfs");
|
|
|
|
/*
|
|
* inode storage initialiser
|
|
*/
|
|
static void romfs_i_init_once(void *_inode)
|
|
{
|
|
struct romfs_inode_info *inode = _inode;
|
|
|
|
inode_init_once(&inode->vfs_inode);
|
|
}
|
|
|
|
/*
|
|
* romfs module initialisation
|
|
*/
|
|
static int __init init_romfs_fs(void)
|
|
{
|
|
int ret;
|
|
|
|
pr_info("ROMFS MTD (C) 2007 Red Hat, Inc.\n");
|
|
|
|
romfs_inode_cachep =
|
|
kmem_cache_create("romfs_i",
|
|
sizeof(struct romfs_inode_info), 0,
|
|
SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
|
|
SLAB_ACCOUNT, romfs_i_init_once);
|
|
|
|
if (!romfs_inode_cachep) {
|
|
pr_err("Failed to initialise inode cache\n");
|
|
return -ENOMEM;
|
|
}
|
|
ret = register_filesystem(&romfs_fs_type);
|
|
if (ret) {
|
|
pr_err("Failed to register filesystem\n");
|
|
goto error_register;
|
|
}
|
|
return 0;
|
|
|
|
error_register:
|
|
kmem_cache_destroy(romfs_inode_cachep);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* romfs module removal
|
|
*/
|
|
static void __exit exit_romfs_fs(void)
|
|
{
|
|
unregister_filesystem(&romfs_fs_type);
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(romfs_inode_cachep);
|
|
}
|
|
|
|
module_init(init_romfs_fs);
|
|
module_exit(exit_romfs_fs);
|
|
|
|
MODULE_DESCRIPTION("Direct-MTD Capable RomFS");
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_LICENSE("GPL"); /* Actually dual-licensed, but it doesn't matter for */
|