649 lines
15 KiB
C
649 lines
15 KiB
C
/*
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* ROMFS file system, Linux implementation
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*
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* Copyright (C) 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 (C) 1991, 1992 Linus Torvalds
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*
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* and parts of the affs filesystem additionally
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* Copyright (C) 1993 Ray Burr
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* Copyright (C) 1996 Hans-Joachim Widmaier
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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 License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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/* todo:
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* - see Documentation/filesystems/romfs.txt
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* - use allocated, not stack memory for file names?
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* - considering write access...
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* - network (tftp) files?
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* - merge back some _op tables
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*/
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/*
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* Sorry about some optimizations and for some goto's. I just wanted
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* to squeeze some more bytes out of this code.. :)
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/romfs_fs.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <asm/uaccess.h>
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struct romfs_inode_info {
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unsigned long i_metasize; /* size of non-data area */
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unsigned long i_dataoffset; /* from the start of fs */
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struct inode vfs_inode;
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};
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/* instead of private superblock data */
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static inline unsigned long romfs_maxsize(struct super_block *sb)
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{
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return (unsigned long)sb->s_fs_info;
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}
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static inline struct romfs_inode_info *ROMFS_I(struct inode *inode)
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{
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return list_entry(inode, struct romfs_inode_info, vfs_inode);
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}
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static __u32
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romfs_checksum(void *data, int size)
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{
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__u32 sum;
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__be32 *ptr;
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sum = 0; ptr = data;
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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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static struct super_operations romfs_ops;
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static int romfs_fill_super(struct super_block *s, void *data, int silent)
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{
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struct buffer_head *bh;
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struct romfs_super_block *rsb;
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struct inode *root;
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int sz;
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/* I would parse the options here, but there are none.. :) */
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sb_set_blocksize(s, ROMBSIZE);
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s->s_maxbytes = 0xFFFFFFFF;
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bh = sb_bread(s, 0);
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if (!bh) {
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/* XXX merge with other printk? */
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printk ("romfs: unable to read superblock\n");
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goto outnobh;
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}
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rsb = (struct romfs_super_block *)bh->b_data;
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sz = be32_to_cpu(rsb->size);
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if (rsb->word0 != ROMSB_WORD0 || rsb->word1 != ROMSB_WORD1
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|| sz < ROMFH_SIZE) {
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if (!silent)
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printk ("VFS: Can't find a romfs filesystem on dev "
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"%s.\n", s->s_id);
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goto out;
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}
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if (romfs_checksum(rsb, min_t(int, sz, 512))) {
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printk ("romfs: bad initial checksum on dev "
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"%s.\n", s->s_id);
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goto out;
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}
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s->s_magic = ROMFS_MAGIC;
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s->s_fs_info = (void *)(long)sz;
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s->s_flags |= MS_RDONLY;
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/* Find the start of the fs */
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sz = (ROMFH_SIZE +
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strnlen(rsb->name, ROMFS_MAXFN) + 1 + ROMFH_PAD)
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& ROMFH_MASK;
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s->s_op = &romfs_ops;
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root = iget(s, sz);
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if (!root)
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goto out;
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s->s_root = d_alloc_root(root);
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if (!s->s_root)
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goto outiput;
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brelse(bh);
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return 0;
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outiput:
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iput(root);
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out:
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brelse(bh);
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outnobh:
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return -EINVAL;
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}
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/* That's simple too. */
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static int
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romfs_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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buf->f_type = ROMFS_MAGIC;
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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 = (romfs_maxsize(sb)+ROMBSIZE-1)>>ROMBSBITS;
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buf->f_namelen = ROMFS_MAXFN;
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return 0;
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}
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/* some helper routines */
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static int
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romfs_strnlen(struct inode *i, unsigned long offset, unsigned long count)
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{
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struct buffer_head *bh;
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unsigned long avail, maxsize, res;
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maxsize = romfs_maxsize(i->i_sb);
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if (offset >= maxsize)
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return -1;
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/* strnlen is almost always valid */
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if (count > maxsize || offset+count > maxsize)
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count = maxsize-offset;
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bh = sb_bread(i->i_sb, offset>>ROMBSBITS);
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if (!bh)
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return -1; /* error */
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avail = ROMBSIZE - (offset & ROMBMASK);
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maxsize = min_t(unsigned long, count, avail);
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res = strnlen(((char *)bh->b_data)+(offset&ROMBMASK), maxsize);
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brelse(bh);
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if (res < maxsize)
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return res; /* found all of it */
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while (res < count) {
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offset += maxsize;
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bh = sb_bread(i->i_sb, offset>>ROMBSBITS);
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if (!bh)
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return -1;
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maxsize = min_t(unsigned long, count - res, ROMBSIZE);
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avail = strnlen(bh->b_data, maxsize);
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res += avail;
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brelse(bh);
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if (avail < maxsize)
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return res;
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}
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return res;
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}
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static int
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romfs_copyfrom(struct inode *i, void *dest, unsigned long offset, unsigned long count)
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{
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struct buffer_head *bh;
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unsigned long avail, maxsize, res;
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maxsize = romfs_maxsize(i->i_sb);
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if (offset >= maxsize || count > maxsize || offset+count>maxsize)
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return -1;
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bh = sb_bread(i->i_sb, offset>>ROMBSBITS);
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if (!bh)
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return -1; /* error */
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avail = ROMBSIZE - (offset & ROMBMASK);
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maxsize = min_t(unsigned long, count, avail);
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memcpy(dest, ((char *)bh->b_data) + (offset & ROMBMASK), maxsize);
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brelse(bh);
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res = maxsize; /* all of it */
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while (res < count) {
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offset += maxsize;
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dest += maxsize;
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bh = sb_bread(i->i_sb, offset>>ROMBSBITS);
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if (!bh)
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return -1;
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maxsize = min_t(unsigned long, count - res, ROMBSIZE);
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memcpy(dest, bh->b_data, maxsize);
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brelse(bh);
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res += maxsize;
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}
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return res;
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}
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static 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 int
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romfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *i = filp->f_dentry->d_inode;
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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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int stored = 0;
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char fsname[ROMFS_MAXFN]; /* XXX dynamic? */
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lock_kernel();
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maxoff = romfs_maxsize(i->i_sb);
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offset = filp->f_pos;
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if (!offset) {
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offset = i->i_ino & ROMFH_MASK;
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if (romfs_copyfrom(i, &ri, offset, ROMFH_SIZE) <= 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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filp->f_pos = offset;
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goto out;
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}
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filp->f_pos = offset;
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/* Fetch inode info */
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if (romfs_copyfrom(i, &ri, offset, ROMFH_SIZE) <= 0)
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goto out;
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j = romfs_strnlen(i, offset+ROMFH_SIZE, sizeof(fsname)-1);
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if (j < 0)
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goto out;
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fsname[j]=0;
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romfs_copyfrom(i, fsname, offset+ROMFH_SIZE, j);
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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 (filldir(dirent, fsname, j, offset, ino,
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romfs_dtype_table[nextfh & ROMFH_TYPE]) < 0) {
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goto out;
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}
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stored++;
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offset = nextfh & ROMFH_MASK;
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}
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out:
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unlock_kernel();
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return stored;
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}
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static struct dentry *
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romfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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{
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unsigned long offset, maxoff;
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int fslen, res;
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struct inode *inode;
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char fsname[ROMFS_MAXFN]; /* XXX dynamic? */
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struct romfs_inode ri;
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const char *name; /* got from dentry */
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int len;
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res = -EACCES; /* placeholder for "no data here" */
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offset = dir->i_ino & ROMFH_MASK;
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lock_kernel();
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if (romfs_copyfrom(dir, &ri, offset, ROMFH_SIZE) <= 0)
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goto out;
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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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/* OK, now find the file whose name is in "dentry" in the
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* directory specified by "dir". */
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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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goto out0;
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if (romfs_copyfrom(dir, &ri, offset, ROMFH_SIZE) <= 0)
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goto out;
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/* try to match the first 16 bytes of name */
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fslen = romfs_strnlen(dir, offset+ROMFH_SIZE, ROMFH_SIZE);
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if (len < ROMFH_SIZE) {
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if (len == fslen) {
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/* both are shorter, and same size */
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romfs_copyfrom(dir, fsname, offset+ROMFH_SIZE, len+1);
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if (strncmp (name, fsname, len) == 0)
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break;
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}
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} else if (fslen >= ROMFH_SIZE) {
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/* both are longer; XXX optimize max size */
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fslen = romfs_strnlen(dir, offset+ROMFH_SIZE, sizeof(fsname)-1);
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if (len == fslen) {
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romfs_copyfrom(dir, fsname, offset+ROMFH_SIZE, len+1);
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if (strncmp(name, fsname, len) == 0)
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break;
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}
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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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/* 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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if ((inode = iget(dir->i_sb, offset)))
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goto outi;
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/*
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* it's a bit funky, _lookup needs to return an error code
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* (negative) or a NULL, both as a dentry. ENOENT should not
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* be returned, instead we need to create a negative dentry by
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* d_add(dentry, NULL); and return 0 as no error.
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* (Although as I see, it only matters on writable file
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* systems).
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*/
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out0: inode = NULL;
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outi: res = 0;
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d_add (dentry, inode);
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out: unlock_kernel();
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return ERR_PTR(res);
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}
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/*
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* Ok, we do readpage, to be able to execute programs. Unfortunately,
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* we can't use bmap, since we may have looser alignments.
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*/
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static int
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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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unsigned long offset, avail, readlen;
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void *buf;
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int result = -EIO;
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page_cache_get(page);
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lock_kernel();
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buf = kmap(page);
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if (!buf)
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goto err_out;
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/* 32 bit warning -- but not for us :) */
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offset = page->index << PAGE_CACHE_SHIFT;
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if (offset < inode->i_size) {
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avail = inode->i_size-offset;
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readlen = min_t(unsigned long, avail, PAGE_SIZE);
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if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) {
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if (readlen < PAGE_SIZE) {
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memset(buf + readlen,0,PAGE_SIZE-readlen);
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}
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SetPageUptodate(page);
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result = 0;
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}
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}
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if (result) {
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memset(buf, 0, PAGE_SIZE);
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SetPageError(page);
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}
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flush_dcache_page(page);
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unlock_page(page);
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kunmap(page);
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err_out:
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page_cache_release(page);
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unlock_kernel();
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return result;
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}
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/* Mapping from our types to the kernel */
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static struct address_space_operations romfs_aops = {
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.readpage = romfs_readpage
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};
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static struct file_operations romfs_dir_operations = {
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.read = generic_read_dir,
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.readdir = romfs_readdir,
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};
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static struct inode_operations romfs_dir_inode_operations = {
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.lookup = romfs_lookup,
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};
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static mode_t romfs_modemap[] =
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{
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0, S_IFDIR+0644, S_IFREG+0644, S_IFLNK+0777,
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S_IFBLK+0600, S_IFCHR+0600, S_IFSOCK+0644, S_IFIFO+0644
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};
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static void
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romfs_read_inode(struct inode *i)
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{
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int nextfh, ino;
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struct romfs_inode ri;
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ino = i->i_ino & ROMFH_MASK;
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i->i_mode = 0;
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/* Loop for finding the real hard link */
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for(;;) {
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if (romfs_copyfrom(i, &ri, ino, ROMFH_SIZE) <= 0) {
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printk("romfs: read error for inode 0x%x\n", ino);
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return;
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}
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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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ino = be32_to_cpu(ri.spec) & ROMFH_MASK;
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}
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i->i_nlink = 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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i->i_uid = i->i_gid = 0;
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/* Precalculate the data offset */
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ino = romfs_strnlen(i, ino+ROMFH_SIZE, ROMFS_MAXFN);
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if (ino >= 0)
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ino = ((ROMFH_SIZE+ino+1+ROMFH_PAD)&ROMFH_MASK);
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else
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ino = 0;
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ROMFS_I(i)->i_metasize = ino;
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ROMFS_I(i)->i_dataoffset = ino+(i->i_ino&ROMFH_MASK);
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/* Compute permissions */
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ino = romfs_modemap[nextfh & ROMFH_TYPE];
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/* only "normal" files have ops */
|
|
switch (nextfh & ROMFH_TYPE) {
|
|
case 1:
|
|
i->i_size = ROMFS_I(i)->i_metasize;
|
|
i->i_op = &romfs_dir_inode_operations;
|
|
i->i_fop = &romfs_dir_operations;
|
|
if (nextfh & ROMFH_EXEC)
|
|
ino |= S_IXUGO;
|
|
i->i_mode = ino;
|
|
break;
|
|
case 2:
|
|
i->i_fop = &generic_ro_fops;
|
|
i->i_data.a_ops = &romfs_aops;
|
|
if (nextfh & ROMFH_EXEC)
|
|
ino |= S_IXUGO;
|
|
i->i_mode = ino;
|
|
break;
|
|
case 3:
|
|
i->i_op = &page_symlink_inode_operations;
|
|
i->i_data.a_ops = &romfs_aops;
|
|
i->i_mode = ino | S_IRWXUGO;
|
|
break;
|
|
default:
|
|
/* depending on MBZ for sock/fifos */
|
|
nextfh = be32_to_cpu(ri.spec);
|
|
init_special_inode(i, ino,
|
|
MKDEV(nextfh>>16,nextfh&0xffff));
|
|
}
|
|
}
|
|
|
|
static kmem_cache_t * romfs_inode_cachep;
|
|
|
|
static struct inode *romfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct romfs_inode_info *ei;
|
|
ei = (struct romfs_inode_info *)kmem_cache_alloc(romfs_inode_cachep, SLAB_KERNEL);
|
|
if (!ei)
|
|
return NULL;
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static void romfs_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode));
|
|
}
|
|
|
|
static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
|
|
{
|
|
struct romfs_inode_info *ei = (struct romfs_inode_info *) foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR)
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
|
|
static int init_inodecache(void)
|
|
{
|
|
romfs_inode_cachep = kmem_cache_create("romfs_inode_cache",
|
|
sizeof(struct romfs_inode_info),
|
|
0, SLAB_RECLAIM_ACCOUNT,
|
|
init_once, NULL);
|
|
if (romfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
if (kmem_cache_destroy(romfs_inode_cachep))
|
|
printk(KERN_INFO "romfs_inode_cache: not all structures were freed\n");
|
|
}
|
|
|
|
static int romfs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
*flags |= MS_RDONLY;
|
|
return 0;
|
|
}
|
|
|
|
static struct super_operations romfs_ops = {
|
|
.alloc_inode = romfs_alloc_inode,
|
|
.destroy_inode = romfs_destroy_inode,
|
|
.read_inode = romfs_read_inode,
|
|
.statfs = romfs_statfs,
|
|
.remount_fs = romfs_remount,
|
|
};
|
|
|
|
static struct super_block *romfs_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, romfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type romfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "romfs",
|
|
.get_sb = romfs_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_romfs_fs(void)
|
|
{
|
|
int err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&romfs_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_romfs_fs(void)
|
|
{
|
|
unregister_filesystem(&romfs_fs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
/* Yes, works even as a module... :) */
|
|
|
|
module_init(init_romfs_fs)
|
|
module_exit(exit_romfs_fs)
|
|
MODULE_LICENSE("GPL");
|