fs/minix/inode.c - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  *  linux/fs/minix/inode.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
  *  Copyright (C) 1996  Gertjan van Wingerde    (gertjan@cs.vu.nl)
  *	Minix V2 fs support.
  *
  *  Modified for 680x0 by Andreas Schwab
  */

 #include <linux/module.h>

 #include <linux/fs.h>
 #include <linux/minix_fs.h>
 #include <linux/slab.h>
 #include <linux/locks.h>
 #include <linux/init.h>
 #include <linux/smp_lock.h>
 #include <linux/highuid.h>
 #include <linux/blkdev.h>

 static void minix_read_inode(struct inode * inode);
 static void minix_write_inode(struct inode * inode, int wait);
 static int minix_statfs(struct super_block *sb, struct statfs *buf);
 static int minix_remount (struct super_block * sb, int * flags, char * data);

 static void minix_delete_inode(struct inode *inode)
 {
 	lock_kernel();

 	inode->i_size = 0;
 	minix_truncate(inode);
 	minix_free_inode(inode);

 	unlock_kernel();
 }

 static void minix_commit_super(struct super_block * sb)
 {
 	mark_buffer_dirty(sb->u.minix_sb.s_sbh);
 	sb->s_dirt = 0;
 }

 static void minix_write_super(struct super_block * sb)
 {
 	struct minix_super_block * ms;

 	if (!(sb->s_flags & MS_RDONLY)) {
 		ms = sb->u.minix_sb.s_ms;

 		if (ms->s_state & MINIX_VALID_FS)
 			ms->s_state &= ~MINIX_VALID_FS;
 		minix_commit_super(sb);
 	}
 	sb->s_dirt = 0;
 }


 static void minix_put_super(struct super_block *sb)
 {
 	int i;

 	if (!(sb->s_flags & MS_RDONLY)) {
 		sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
 		mark_buffer_dirty(sb->u.minix_sb.s_sbh);
 	}
 	for (i = 0; i < sb->u.minix_sb.s_imap_blocks; i++)
 		brelse(sb->u.minix_sb.s_imap[i]);
 	for (i = 0; i < sb->u.minix_sb.s_zmap_blocks; i++)
 		brelse(sb->u.minix_sb.s_zmap[i]);
 	brelse (sb->u.minix_sb.s_sbh);
 	kfree(sb->u.minix_sb.s_imap);

 	return;
 }

 static struct super_operations minix_sops = {
 	read_inode:	minix_read_inode,
 	write_inode:	minix_write_inode,
 	delete_inode:	minix_delete_inode,
 	put_super:	minix_put_super,
 	write_super:	minix_write_super,
 	statfs:		minix_statfs,
 	remount_fs:	minix_remount,
 };

 static int minix_remount (struct super_block * sb, int * flags, char * data)
 {
 	struct minix_super_block * ms;

 	ms = sb->u.minix_sb.s_ms;
 	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 		return 0;
 	if (*flags & MS_RDONLY) {
 		if (ms->s_state & MINIX_VALID_FS ||
 		    !(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
 			return 0;
 		/* Mounting a rw partition read-only. */
 		ms->s_state = sb->u.minix_sb.s_mount_state;
 		mark_buffer_dirty(sb->u.minix_sb.s_sbh);
 		sb->s_dirt = 1;
 		minix_commit_super(sb);
 	}
 	else {
 	  	/* Mount a partition which is read-only, read-write. */
 		sb->u.minix_sb.s_mount_state = ms->s_state;
 		ms->s_state &= ~MINIX_VALID_FS;
 		mark_buffer_dirty(sb->u.minix_sb.s_sbh);
 		sb->s_dirt = 1;

 		if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
 			printk ("MINIX-fs warning: remounting unchecked fs, "
 				"running fsck is recommended.\n");
 		else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
 			printk ("MINIX-fs warning: remounting fs with errors, "
 				"running fsck is recommended.\n");
 	}
 	return 0;
 }

 static struct super_block *minix_read_super(struct super_block *s, void *data,
 				     int silent)
 {
 	struct buffer_head *bh;
 	struct buffer_head **map;
 	struct minix_super_block *ms;
 	int i, block;
 	kdev_t dev = s->s_dev;
 	struct inode *root_inode;
 	unsigned int hblock;
 	struct minix_sb_info *sbi = &s->u.minix_sb;

 	/* N.B. These should be compile-time tests.
 	   Unfortunately that is impossible. */
 	if (32 != sizeof (struct minix_inode))
 		panic("bad V1 i-node size");
 	if (64 != sizeof(struct minix2_inode))
 		panic("bad V2 i-node size");

 	hblock = get_hardsect_size(dev);
 	if (hblock > BLOCK_SIZE)
 		goto out_bad_hblock;

 	set_blocksize(dev, BLOCK_SIZE);
 	s->s_blocksize = BLOCK_SIZE;
 	s->s_blocksize_bits = BLOCK_SIZE_BITS;
 	if (!(bh = sb_bread(s, 1)))
 		goto out_bad_sb;

 	ms = (struct minix_super_block *) bh->b_data;
 	sbi->s_ms = ms;
 	sbi->s_sbh = bh;
 	sbi->s_mount_state = ms->s_state;
 	sbi->s_ninodes = ms->s_ninodes;
 	sbi->s_nzones = ms->s_nzones;
 	sbi->s_imap_blocks = ms->s_imap_blocks;
 	sbi->s_zmap_blocks = ms->s_zmap_blocks;
 	sbi->s_firstdatazone = ms->s_firstdatazone;
 	sbi->s_log_zone_size = ms->s_log_zone_size;
 	sbi->s_max_size = ms->s_max_size;
 	s->s_magic = ms->s_magic;
 	if (s->s_magic == MINIX_SUPER_MAGIC) {
 		sbi->s_version = MINIX_V1;
 		sbi->s_dirsize = 16;
 		sbi->s_namelen = 14;
 		sbi->s_link_max = MINIX_LINK_MAX;
 	} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
 		sbi->s_version = MINIX_V1;
 		sbi->s_dirsize = 32;
 		sbi->s_namelen = 30;
 		sbi->s_link_max = MINIX_LINK_MAX;
 	} else if (s->s_magic == MINIX2_SUPER_MAGIC) {
 		sbi->s_version = MINIX_V2;
 		sbi->s_nzones = ms->s_zones;
 		sbi->s_dirsize = 16;
 		sbi->s_namelen = 14;
 		sbi->s_link_max = MINIX2_LINK_MAX;
 	} else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
 		sbi->s_version = MINIX_V2;
 		sbi->s_nzones = ms->s_zones;
 		sbi->s_dirsize = 32;
 		sbi->s_namelen = 30;
 		sbi->s_link_max = MINIX2_LINK_MAX;
 	} else
 		goto out_no_fs;

 	/*
 	 * Allocate the buffer map to keep the superblock small.
 	 */
 	i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
 	map = kmalloc(i, GFP_KERNEL);
 	if (!map)
 		goto out_no_map;
 	memset(map, 0, i);
 	sbi->s_imap = &map[0];
 	sbi->s_zmap = &map[sbi->s_imap_blocks];

 	block=2;
 	for (i=0 ; i < sbi->s_imap_blocks ; i++) {
 		if (!(sbi->s_imap[i]=sb_bread(s, block)))
 			goto out_no_bitmap;
 		block++;
 	}
 	for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
 		if (!(sbi->s_zmap[i]=sb_bread(s, block)))
 			goto out_no_bitmap;
 		block++;
 	}

 	minix_set_bit(0,sbi->s_imap[0]->b_data);
 	minix_set_bit(0,sbi->s_zmap[0]->b_data);

 	/* set up enough so that it can read an inode */
 	s->s_op = &minix_sops;
 	root_inode = iget(s, MINIX_ROOT_INO);
 	if (!root_inode)
 		goto out_no_root;

 	s->s_root = d_alloc_root(root_inode);
 	if (!s->s_root)
 		goto out_iput;

 	if (!NO_TRUNCATE)
 		s->s_root->d_op = &minix_dentry_operations;

 	if (!(s->s_flags & MS_RDONLY)) {
 		ms->s_state &= ~MINIX_VALID_FS;
 		mark_buffer_dirty(bh);
 		s->s_dirt = 1;
 	}
 	if (!(sbi->s_mount_state & MINIX_VALID_FS))
 		printk ("MINIX-fs: mounting unchecked file system, "
 			"running fsck is recommended.\n");
  	else if (sbi->s_mount_state & MINIX_ERROR_FS)
 		printk ("MINIX-fs: mounting file system with errors, "
 			"running fsck is recommended.\n");
 	return s;

 out_iput:
 	iput(root_inode);
 	goto out_freemap;

 out_no_root:
 	if (!silent)
 		printk("MINIX-fs: get root inode failed\n");
 	goto out_freemap;

 out_no_bitmap:
 	printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
     out_freemap:
 	for (i = 0; i < sbi->s_imap_blocks; i++)
 		brelse(sbi->s_imap[i]);
 	for (i = 0; i < sbi->s_zmap_blocks; i++)
 		brelse(sbi->s_zmap[i]);
 	kfree(sbi->s_imap);
 	goto out_release;

 out_no_map:
 	if (!silent)
 		printk ("MINIX-fs: can't allocate map\n");
 	goto out_release;

 out_no_fs:
 	if (!silent)
 		printk("VFS: Can't find a Minix or Minix V2 filesystem on device "
 		       "%s.\n", kdevname(dev));
     out_release:
 	brelse(bh);
 	goto out;

 out_bad_hblock:
 	printk("MINIX-fs: blocksize too small for device.\n");
 	goto out;

 out_bad_sb:
 	printk("MINIX-fs: unable to read superblock\n");
  out:
 	return NULL;
 }

 static int minix_statfs(struct super_block *sb, struct statfs *buf)
 {
 	buf->f_type = sb->s_magic;
 	buf->f_bsize = sb->s_blocksize;
 	buf->f_blocks = (sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone) << sb->u.minix_sb.s_log_zone_size;
 	buf->f_bfree = minix_count_free_blocks(sb);
 	buf->f_bavail = buf->f_bfree;
 	buf->f_files = sb->u.minix_sb.s_ninodes;
 	buf->f_ffree = minix_count_free_inodes(sb);
 	buf->f_namelen = sb->u.minix_sb.s_namelen;
 	return 0;
 }

 static int minix_get_block(struct inode *inode, sector_t block,
 		    struct buffer_head *bh_result, int create)
 {
 	if (INODE_VERSION(inode) == MINIX_V1)
 		return V1_minix_get_block(inode, block, bh_result, create);
 	else
 		return V2_minix_get_block(inode, block, bh_result, create);
 }

 static int minix_writepage(struct page *page)
 {
 	return block_write_full_page(page,minix_get_block);
 }
 static int minix_readpage(struct file *file, struct page *page)
 {
 	return block_read_full_page(page,minix_get_block);
 }
 static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 {
 	return block_prepare_write(page,from,to,minix_get_block);
 }
 static int minix_bmap(struct address_space *mapping, long block)
 {
 	return generic_block_bmap(mapping,block,minix_get_block);
 }
 static struct address_space_operations minix_aops = {
 	readpage: minix_readpage,
 	writepage: minix_writepage,
 	sync_page: block_sync_page,
 	prepare_write: minix_prepare_write,
 	commit_write: generic_commit_write,
 	bmap: minix_bmap
 };

 void minix_set_inode(struct inode *inode, dev_t rdev)
 {
 	if (S_ISREG(inode->i_mode)) {
 		inode->i_op = &minix_file_inode_operations;
 		inode->i_fop = &minix_file_operations;
 		inode->i_mapping->a_ops = &minix_aops;
 	} else if (S_ISDIR(inode->i_mode)) {
 		inode->i_op = &minix_dir_inode_operations;
 		inode->i_fop = &minix_dir_operations;
 		inode->i_mapping->a_ops = &minix_aops;
 	} else if (S_ISLNK(inode->i_mode)) {
 		inode->i_op = &page_symlink_inode_operations;
 		inode->i_mapping->a_ops = &minix_aops;
 	} else
 		init_special_inode(inode, inode->i_mode, rdev);
 }

 /*
  * The minix V1 function to read an inode.
  */
 static void V1_minix_read_inode(struct inode * inode)
 {
 	struct buffer_head * bh;
 	struct minix_inode * raw_inode;
 	int i;

 	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 	if (!raw_inode)
 		return;
 	inode->i_mode = raw_inode->i_mode;
 	inode->i_uid = (uid_t)raw_inode->i_uid;
 	inode->i_gid = (gid_t)raw_inode->i_gid;
 	inode->i_nlink = raw_inode->i_nlinks;
 	inode->i_size = raw_inode->i_size;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
 	inode->i_blocks = inode->i_blksize = 0;
 	for (i = 0; i < 9; i++)
 		inode->u.minix_i.u.i1_data[i] = raw_inode->i_zone[i];
 	minix_set_inode(inode, raw_inode->i_zone[0]);
 	brelse(bh);
 }

 /*
  * The minix V2 function to read an inode.
  */
 static void V2_minix_read_inode(struct inode * inode)
 {
 	struct buffer_head * bh;
 	struct minix2_inode * raw_inode;
 	int i;

 	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 	if (!raw_inode)
 		return;
 	inode->i_mode = raw_inode->i_mode;
 	inode->i_uid = (uid_t)raw_inode->i_uid;
 	inode->i_gid = (gid_t)raw_inode->i_gid;
 	inode->i_nlink = raw_inode->i_nlinks;
 	inode->i_size = raw_inode->i_size;
 	inode->i_mtime = raw_inode->i_mtime;
 	inode->i_atime = raw_inode->i_atime;
 	inode->i_ctime = raw_inode->i_ctime;
 	inode->i_blocks = inode->i_blksize = 0;
 	for (i = 0; i < 10; i++)
 		inode->u.minix_i.u.i2_data[i] = raw_inode->i_zone[i];
 	minix_set_inode(inode, raw_inode->i_zone[0]);
 	brelse(bh);
 }

 /*
  * The global function to read an inode.
  */
 static void minix_read_inode(struct inode * inode)
 {
 	if (INODE_VERSION(inode) == MINIX_V1)
 		V1_minix_read_inode(inode);
 	else
 		V2_minix_read_inode(inode);
 }

 /*
  * The minix V1 function to synchronize an inode.
  */
 static struct buffer_head * V1_minix_update_inode(struct inode * inode)
 {
 	struct buffer_head * bh;
 	struct minix_inode * raw_inode;
 	int i;

 	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
 	if (!raw_inode)
 		return 0;
 	raw_inode->i_mode = inode->i_mode;
 	raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 	raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 	raw_inode->i_nlinks = inode->i_nlink;
 	raw_inode->i_size = inode->i_size;
 	raw_inode->i_time = inode->i_mtime;
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 		raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
 	else for (i = 0; i < 9; i++)
 		raw_inode->i_zone[i] = inode->u.minix_i.u.i1_data[i];
 	mark_buffer_dirty(bh);
 	return bh;
 }

 /*
  * The minix V2 function to synchronize an inode.
  */
 static struct buffer_head * V2_minix_update_inode(struct inode * inode)
 {
 	struct buffer_head * bh;
 	struct minix2_inode * raw_inode;
 	int i;

 	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
 	if (!raw_inode)
 		return 0;
 	raw_inode->i_mode = inode->i_mode;
 	raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
 	raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
 	raw_inode->i_nlinks = inode->i_nlink;
 	raw_inode->i_size = inode->i_size;
 	raw_inode->i_mtime = inode->i_mtime;
 	raw_inode->i_atime = inode->i_atime;
 	raw_inode->i_ctime = inode->i_ctime;
 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 		raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
 	else for (i = 0; i < 10; i++)
 		raw_inode->i_zone[i] = inode->u.minix_i.u.i2_data[i];
 	mark_buffer_dirty(bh);
 	return bh;
 }

 static struct buffer_head *minix_update_inode(struct inode *inode)
 {
 	if (INODE_VERSION(inode) == MINIX_V1)
 		return V1_minix_update_inode(inode);
 	else
 		return V2_minix_update_inode(inode);
 }

 static void minix_write_inode(struct inode * inode, int wait)
 {
 	struct buffer_head *bh;

 	lock_kernel();
 	bh = minix_update_inode(inode);
 	unlock_kernel();
 	brelse(bh);
 }

 int minix_sync_inode(struct inode * inode)
 {
 	int err = 0;
 	struct buffer_head *bh;

 	bh = minix_update_inode(inode);
 	if (bh && buffer_dirty(bh))
 	{
 		ll_rw_block(WRITE, 1, &bh);
 		wait_on_buffer(bh);
 		if (buffer_req(bh) && !buffer_uptodate(bh))
 		{
 			printk ("IO error syncing minix inode ["
 				"%s:%08lx]\n",
 				kdevname(inode->i_dev), inode->i_ino);
 			err = -1;
 		}
 	}
 	else if (!bh)
 		err = -1;
 	brelse (bh);
 	return err;
 }

 /*
  * The function that is called for file truncation.
  */
 void minix_truncate(struct inode * inode)
 {
 	if (INODE_VERSION(inode) == MINIX_V1)
 		V1_minix_truncate(inode);
 	else
 		V2_minix_truncate(inode);
 }

 static DECLARE_FSTYPE_DEV(minix_fs_type,"minix",minix_read_super);

 static int __init init_minix_fs(void)
 {
         return register_filesystem(&minix_fs_type);
 }

 static void __exit exit_minix_fs(void)
 {
         unregister_filesystem(&minix_fs_type);
 }

 EXPORT_NO_SYMBOLS;

 module_init(init_minix_fs)
 module_exit(exit_minix_fs)
 MODULE_LICENSE("GPL");
	/*
	* linux/fs/minix/inode.c
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	*
	* Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
	* Minix V2 fs support.
	*
	* Modified for 680x0 by Andreas Schwab
	*/

	#include <linux/module.h>

	#include <linux/fs.h>
	#include <linux/minix_fs.h>
	#include <linux/slab.h>
	#include <linux/locks.h>
	#include <linux/init.h>
	#include <linux/smp_lock.h>
	#include <linux/highuid.h>
	#include <linux/blkdev.h>

	static void minix_read_inode(struct inode * inode);
	static void minix_write_inode(struct inode * inode, int wait);
	static int minix_statfs(struct super_block sb, struct statfs buf);
	static int minix_remount (struct super_block * sb, int * flags, char * data);

	static void minix_delete_inode(struct inode *inode)
	{
	lock_kernel();

	inode->i_size = 0;
	minix_truncate(inode);
	minix_free_inode(inode);

	unlock_kernel();
	}

	static void minix_commit_super(struct super_block * sb)
	{
	mark_buffer_dirty(sb->u.minix_sb.s_sbh);
	sb->s_dirt = 0;
	}

	static void minix_write_super(struct super_block * sb)
	{
	struct minix_super_block * ms;

	if (!(sb->s_flags & MS_RDONLY)) {
	ms = sb->u.minix_sb.s_ms;

	if (ms->s_state & MINIX_VALID_FS)
	ms->s_state &= ~MINIX_VALID_FS;
	minix_commit_super(sb);
	}
	sb->s_dirt = 0;
	}


	static void minix_put_super(struct super_block *sb)
	{
	int i;

	if (!(sb->s_flags & MS_RDONLY)) {
	sb->u.minix_sb.s_ms->s_state = sb->u.minix_sb.s_mount_state;
	mark_buffer_dirty(sb->u.minix_sb.s_sbh);
	}
	for (i = 0; i < sb->u.minix_sb.s_imap_blocks; i++)
	brelse(sb->u.minix_sb.s_imap[i]);
	for (i = 0; i < sb->u.minix_sb.s_zmap_blocks; i++)
	brelse(sb->u.minix_sb.s_zmap[i]);
	brelse (sb->u.minix_sb.s_sbh);
	kfree(sb->u.minix_sb.s_imap);

	return;
	}

	static struct super_operations minix_sops = {
	read_inode: minix_read_inode,
	write_inode: minix_write_inode,
	delete_inode: minix_delete_inode,
	put_super: minix_put_super,
	write_super: minix_write_super,
	statfs: minix_statfs,
	remount_fs: minix_remount,
	};

	static int minix_remount (struct super_block * sb, int * flags, char * data)
	{
	struct minix_super_block * ms;

	ms = sb->u.minix_sb.s_ms;
	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	return 0;
	if (*flags & MS_RDONLY) {
	if (ms->s_state & MINIX_VALID_FS \|\|
	!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
	return 0;
	/* Mounting a rw partition read-only. */
	ms->s_state = sb->u.minix_sb.s_mount_state;
	mark_buffer_dirty(sb->u.minix_sb.s_sbh);
	sb->s_dirt = 1;
	minix_commit_super(sb);
	}
	else {
	/* Mount a partition which is read-only, read-write. */
	sb->u.minix_sb.s_mount_state = ms->s_state;
	ms->s_state &= ~MINIX_VALID_FS;
	mark_buffer_dirty(sb->u.minix_sb.s_sbh);
	sb->s_dirt = 1;

	if (!(sb->u.minix_sb.s_mount_state & MINIX_VALID_FS))
	printk ("MINIX-fs warning: remounting unchecked fs, "
	"running fsck is recommended.\n");
	else if ((sb->u.minix_sb.s_mount_state & MINIX_ERROR_FS))
	printk ("MINIX-fs warning: remounting fs with errors, "
	"running fsck is recommended.\n");
	}
	return 0;
	}

	static struct super_block minix_read_super(struct super_block s, void *data,
	int silent)
	{
	struct buffer_head *bh;
	struct buffer_head **map;
	struct minix_super_block *ms;
	int i, block;
	kdev_t dev = s->s_dev;
	struct inode *root_inode;
	unsigned int hblock;
	struct minix_sb_info *sbi = &s->u.minix_sb;

	/* N.B. These should be compile-time tests.
	Unfortunately that is impossible. */
	if (32 != sizeof (struct minix_inode))
	panic("bad V1 i-node size");
	if (64 != sizeof(struct minix2_inode))
	panic("bad V2 i-node size");

	hblock = get_hardsect_size(dev);
	if (hblock > BLOCK_SIZE)
	goto out_bad_hblock;

	set_blocksize(dev, BLOCK_SIZE);
	s->s_blocksize = BLOCK_SIZE;
	s->s_blocksize_bits = BLOCK_SIZE_BITS;
	if (!(bh = sb_bread(s, 1)))
	goto out_bad_sb;

	ms = (struct minix_super_block *) bh->b_data;
	sbi->s_ms = ms;
	sbi->s_sbh = bh;
	sbi->s_mount_state = ms->s_state;
	sbi->s_ninodes = ms->s_ninodes;
	sbi->s_nzones = ms->s_nzones;
	sbi->s_imap_blocks = ms->s_imap_blocks;
	sbi->s_zmap_blocks = ms->s_zmap_blocks;
	sbi->s_firstdatazone = ms->s_firstdatazone;
	sbi->s_log_zone_size = ms->s_log_zone_size;
	sbi->s_max_size = ms->s_max_size;
	s->s_magic = ms->s_magic;
	if (s->s_magic == MINIX_SUPER_MAGIC) {
	sbi->s_version = MINIX_V1;
	sbi->s_dirsize = 16;
	sbi->s_namelen = 14;
	sbi->s_link_max = MINIX_LINK_MAX;
	} else if (s->s_magic == MINIX_SUPER_MAGIC2) {
	sbi->s_version = MINIX_V1;
	sbi->s_dirsize = 32;
	sbi->s_namelen = 30;
	sbi->s_link_max = MINIX_LINK_MAX;
	} else if (s->s_magic == MINIX2_SUPER_MAGIC) {
	sbi->s_version = MINIX_V2;
	sbi->s_nzones = ms->s_zones;
	sbi->s_dirsize = 16;
	sbi->s_namelen = 14;
	sbi->s_link_max = MINIX2_LINK_MAX;
	} else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
	sbi->s_version = MINIX_V2;
	sbi->s_nzones = ms->s_zones;
	sbi->s_dirsize = 32;
	sbi->s_namelen = 30;
	sbi->s_link_max = MINIX2_LINK_MAX;
	} else
	goto out_no_fs;

	/*
	* Allocate the buffer map to keep the superblock small.
	*/
	i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
	map = kmalloc(i, GFP_KERNEL);
	if (!map)
	goto out_no_map;
	memset(map, 0, i);
	sbi->s_imap = &map[0];
	sbi->s_zmap = &map[sbi->s_imap_blocks];

	block=2;
	for (i=0 ; i < sbi->s_imap_blocks ; i++) {
	if (!(sbi->s_imap[i]=sb_bread(s, block)))
	goto out_no_bitmap;
	block++;
	}
	for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
	if (!(sbi->s_zmap[i]=sb_bread(s, block)))
	goto out_no_bitmap;
	block++;
	}

	minix_set_bit(0,sbi->s_imap[0]->b_data);
	minix_set_bit(0,sbi->s_zmap[0]->b_data);

	/* set up enough so that it can read an inode */
	s->s_op = &minix_sops;
	root_inode = iget(s, MINIX_ROOT_INO);
	if (!root_inode)
	goto out_no_root;

	s->s_root = d_alloc_root(root_inode);
	if (!s->s_root)
	goto out_iput;

	if (!NO_TRUNCATE)
	s->s_root->d_op = &minix_dentry_operations;

	if (!(s->s_flags & MS_RDONLY)) {
	ms->s_state &= ~MINIX_VALID_FS;
	mark_buffer_dirty(bh);
	s->s_dirt = 1;
	}
	if (!(sbi->s_mount_state & MINIX_VALID_FS))
	printk ("MINIX-fs: mounting unchecked file system, "
	"running fsck is recommended.\n");
	else if (sbi->s_mount_state & MINIX_ERROR_FS)
	printk ("MINIX-fs: mounting file system with errors, "
	"running fsck is recommended.\n");
	return s;

	out_iput:
	iput(root_inode);
	goto out_freemap;

	out_no_root:
	if (!silent)
	printk("MINIX-fs: get root inode failed\n");
	goto out_freemap;

	out_no_bitmap:
	printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
	out_freemap:
	for (i = 0; i < sbi->s_imap_blocks; i++)
	brelse(sbi->s_imap[i]);
	for (i = 0; i < sbi->s_zmap_blocks; i++)
	brelse(sbi->s_zmap[i]);
	kfree(sbi->s_imap);
	goto out_release;

	out_no_map:
	if (!silent)
	printk ("MINIX-fs: can't allocate map\n");
	goto out_release;

	out_no_fs:
	if (!silent)
	printk("VFS: Can't find a Minix or Minix V2 filesystem on device "
	"%s.\n", kdevname(dev));
	out_release:
	brelse(bh);
	goto out;

	out_bad_hblock:
	printk("MINIX-fs: blocksize too small for device.\n");
	goto out;

	out_bad_sb:
	printk("MINIX-fs: unable to read superblock\n");
	out:
	return NULL;
	}

	static int minix_statfs(struct super_block sb, struct statfs buf)
	{
	buf->f_type = sb->s_magic;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = (sb->u.minix_sb.s_nzones - sb->u.minix_sb.s_firstdatazone) << sb->u.minix_sb.s_log_zone_size;
	buf->f_bfree = minix_count_free_blocks(sb);
	buf->f_bavail = buf->f_bfree;
	buf->f_files = sb->u.minix_sb.s_ninodes;
	buf->f_ffree = minix_count_free_inodes(sb);
	buf->f_namelen = sb->u.minix_sb.s_namelen;
	return 0;
	}

	static int minix_get_block(struct inode *inode, sector_t block,
	struct buffer_head *bh_result, int create)
	{
	if (INODE_VERSION(inode) == MINIX_V1)
	return V1_minix_get_block(inode, block, bh_result, create);
	else
	return V2_minix_get_block(inode, block, bh_result, create);
	}

	static int minix_writepage(struct page *page)
	{
	return block_write_full_page(page,minix_get_block);
	}
	static int minix_readpage(struct file file, struct page page)
	{
	return block_read_full_page(page,minix_get_block);
	}
	static int minix_prepare_write(struct file file, struct page page, unsigned from, unsigned to)
	{
	return block_prepare_write(page,from,to,minix_get_block);
	}
	static int minix_bmap(struct address_space *mapping, long block)
	{
	return generic_block_bmap(mapping,block,minix_get_block);
	}
	static struct address_space_operations minix_aops = {
	readpage: minix_readpage,
	writepage: minix_writepage,
	sync_page: block_sync_page,
	prepare_write: minix_prepare_write,
	commit_write: generic_commit_write,
	bmap: minix_bmap
	};

	void minix_set_inode(struct inode *inode, dev_t rdev)
	{
	if (S_ISREG(inode->i_mode)) {
	inode->i_op = &minix_file_inode_operations;
	inode->i_fop = &minix_file_operations;
	inode->i_mapping->a_ops = &minix_aops;
	} else if (S_ISDIR(inode->i_mode)) {
	inode->i_op = &minix_dir_inode_operations;
	inode->i_fop = &minix_dir_operations;
	inode->i_mapping->a_ops = &minix_aops;
	} else if (S_ISLNK(inode->i_mode)) {
	inode->i_op = &page_symlink_inode_operations;
	inode->i_mapping->a_ops = &minix_aops;
	} else
	init_special_inode(inode, inode->i_mode, rdev);
	}

	/*
	* The minix V1 function to read an inode.
	*/
	static void V1_minix_read_inode(struct inode * inode)
	{
	struct buffer_head * bh;
	struct minix_inode * raw_inode;
	int i;

	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
	if (!raw_inode)
	return;
	inode->i_mode = raw_inode->i_mode;
	inode->i_uid = (uid_t)raw_inode->i_uid;
	inode->i_gid = (gid_t)raw_inode->i_gid;
	inode->i_nlink = raw_inode->i_nlinks;
	inode->i_size = raw_inode->i_size;
	inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
	inode->i_blocks = inode->i_blksize = 0;
	for (i = 0; i < 9; i++)
	inode->u.minix_i.u.i1_data[i] = raw_inode->i_zone[i];
	minix_set_inode(inode, raw_inode->i_zone[0]);
	brelse(bh);
	}

	/*
	* The minix V2 function to read an inode.
	*/
	static void V2_minix_read_inode(struct inode * inode)
	{
	struct buffer_head * bh;
	struct minix2_inode * raw_inode;
	int i;

	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
	if (!raw_inode)
	return;
	inode->i_mode = raw_inode->i_mode;
	inode->i_uid = (uid_t)raw_inode->i_uid;
	inode->i_gid = (gid_t)raw_inode->i_gid;
	inode->i_nlink = raw_inode->i_nlinks;
	inode->i_size = raw_inode->i_size;
	inode->i_mtime = raw_inode->i_mtime;
	inode->i_atime = raw_inode->i_atime;
	inode->i_ctime = raw_inode->i_ctime;
	inode->i_blocks = inode->i_blksize = 0;
	for (i = 0; i < 10; i++)
	inode->u.minix_i.u.i2_data[i] = raw_inode->i_zone[i];
	minix_set_inode(inode, raw_inode->i_zone[0]);
	brelse(bh);
	}

	/*
	* The global function to read an inode.
	*/
	static void minix_read_inode(struct inode * inode)
	{
	if (INODE_VERSION(inode) == MINIX_V1)
	V1_minix_read_inode(inode);
	else
	V2_minix_read_inode(inode);
	}

	/*
	* The minix V1 function to synchronize an inode.
	*/
	static struct buffer_head * V1_minix_update_inode(struct inode * inode)
	{
	struct buffer_head * bh;
	struct minix_inode * raw_inode;
	int i;

	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
	if (!raw_inode)
	return 0;
	raw_inode->i_mode = inode->i_mode;
	raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
	raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
	raw_inode->i_nlinks = inode->i_nlink;
	raw_inode->i_size = inode->i_size;
	raw_inode->i_time = inode->i_mtime;
	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
	else for (i = 0; i < 9; i++)
	raw_inode->i_zone[i] = inode->u.minix_i.u.i1_data[i];
	mark_buffer_dirty(bh);
	return bh;
	}

	/*
	* The minix V2 function to synchronize an inode.
	*/
	static struct buffer_head * V2_minix_update_inode(struct inode * inode)
	{
	struct buffer_head * bh;
	struct minix2_inode * raw_inode;
	int i;

	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
	if (!raw_inode)
	return 0;
	raw_inode->i_mode = inode->i_mode;
	raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
	raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
	raw_inode->i_nlinks = inode->i_nlink;
	raw_inode->i_size = inode->i_size;
	raw_inode->i_mtime = inode->i_mtime;
	raw_inode->i_atime = inode->i_atime;
	raw_inode->i_ctime = inode->i_ctime;
	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	raw_inode->i_zone[0] = kdev_t_to_nr(inode->i_rdev);
	else for (i = 0; i < 10; i++)
	raw_inode->i_zone[i] = inode->u.minix_i.u.i2_data[i];
	mark_buffer_dirty(bh);
	return bh;
	}

	static struct buffer_head minix_update_inode(struct inode inode)
	{
	if (INODE_VERSION(inode) == MINIX_V1)
	return V1_minix_update_inode(inode);
	else
	return V2_minix_update_inode(inode);
	}

	static void minix_write_inode(struct inode * inode, int wait)
	{
	struct buffer_head *bh;

	lock_kernel();
	bh = minix_update_inode(inode);
	unlock_kernel();
	brelse(bh);
	}

	int minix_sync_inode(struct inode * inode)
	{
	int err = 0;
	struct buffer_head *bh;

	bh = minix_update_inode(inode);
	if (bh && buffer_dirty(bh))
	{
	ll_rw_block(WRITE, 1, &bh);
	wait_on_buffer(bh);
	if (buffer_req(bh) && !buffer_uptodate(bh))
	{
	printk ("IO error syncing minix inode ["
	"%s:%08lx]\n",
	kdevname(inode->i_dev), inode->i_ino);
	err = -1;
	}
	}
	else if (!bh)
	err = -1;
	brelse (bh);
	return err;
	}

	/*
	* The function that is called for file truncation.
	*/
	void minix_truncate(struct inode * inode)
	{
	if (INODE_VERSION(inode) == MINIX_V1)
	V1_minix_truncate(inode);
	else
	V2_minix_truncate(inode);
	}

	static DECLARE_FSTYPE_DEV(minix_fs_type,"minix",minix_read_super);

	static int __init init_minix_fs(void)
	{
	return register_filesystem(&minix_fs_type);
	}

	static void __exit exit_minix_fs(void)
	{
	unregister_filesystem(&minix_fs_type);
	}

	EXPORT_NO_SYMBOLS;

	module_init(init_minix_fs)
	module_exit(exit_minix_fs)
	MODULE_LICENSE("GPL");