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668 lines
15 KiB
668 lines
15 KiB
/* 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 ([email protected]) |
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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 <[email protected]> |
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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/fs_context.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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|
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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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/* |
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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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i->i_blocks = (i->i_size + 511) >> 9; |
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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_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode)); |
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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 = u64_to_fsid(id); |
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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_reconfigure(struct fs_context *fc) |
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{ |
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sync_filesystem(fc->root->d_sb); |
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fc->sb_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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.free_inode = romfs_free_inode, |
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.statfs = romfs_statfs, |
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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, struct fs_context *fc) |
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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_time_min = 0; |
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sb->s_time_max = 0; |
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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 (!(fc->sb_flags & SB_SILENT)) |
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errorf(fc, "VFS: Can't find a romfs filesystem on dev %s.\n", |
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sb->s_id); |
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goto error_rsb_inval; |
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} |
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if (romfs_checksum(rsb, min_t(size_t, img_size, 512))) { |
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pr_err("bad initial checksum on dev %s.\n", sb->s_id); |
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goto error_rsb_inval; |
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} |
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storage = sb->s_mtd ? "MTD" : "the block layer"; |
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len = strnlen(rsb->name, ROMFS_MAXFN); |
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if (!(fc->sb_flags & SB_SILENT)) |
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pr_notice("Mounting image '%*.*s' through %s\n", |
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(unsigned) len, (unsigned) len, rsb->name, storage); |
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kfree(rsb); |
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rsb = NULL; |
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/* find the root directory */ |
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pos = (ROMFH_SIZE + len + 1 + ROMFH_PAD) & ROMFH_MASK; |
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root = romfs_iget(sb, pos); |
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if (IS_ERR(root)) |
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return PTR_ERR(root); |
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sb->s_root = d_make_root(root); |
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if (!sb->s_root) |
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return -ENOMEM; |
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return 0; |
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error_rsb_inval: |
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ret = -EINVAL; |
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error_rsb: |
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kfree(rsb); |
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return ret; |
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} |
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/* |
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* get a superblock for mounting |
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*/ |
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static int romfs_get_tree(struct fs_context *fc) |
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{ |
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int ret = -EINVAL; |
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#ifdef CONFIG_ROMFS_ON_MTD |
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ret = get_tree_mtd(fc, romfs_fill_super); |
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#endif |
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#ifdef CONFIG_ROMFS_ON_BLOCK |
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if (ret == -EINVAL) |
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ret = get_tree_bdev(fc, romfs_fill_super); |
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#endif |
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return ret; |
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} |
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static const struct fs_context_operations romfs_context_ops = { |
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.get_tree = romfs_get_tree, |
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.reconfigure = romfs_reconfigure, |
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}; |
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/* |
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* Set up the filesystem mount context. |
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*/ |
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static int romfs_init_fs_context(struct fs_context *fc) |
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{ |
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fc->ops = &romfs_context_ops; |
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return 0; |
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} |
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|
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/* |
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* destroy a romfs superblock in the appropriate manner |
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*/ |
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static void romfs_kill_sb(struct super_block *sb) |
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{ |
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#ifdef CONFIG_ROMFS_ON_MTD |
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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", |
|
.init_fs_context = romfs_init_fs_context, |
|
.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 */
|
|
|