/*
   *  linux/fs/minix/inode.c
   *
   *  Copyright (C) 1991, 1992  Linus Torvalds
   *

   *  Copyright (C) 1996  Gertjan van Wingerde

   *	Minix V2 fs support.
   *
   *  Modified for 680x0 by Andreas Schwab

   *  Updated to filesystem version 3 by Daniel Aragones

   */
  
  #include <linux/module.h>
  #include "minix.h"
  #include <linux/buffer_head.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  #include <linux/highuid.h>
  #include <linux/vfs.h>

  #include <linux/writeback.h>

  static int minix_write_inode(struct inode *inode,
  		struct writeback_control *wbc);

  static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);

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

  static void minix_evict_inode(struct inode *inode)

  {

  	truncate_inode_pages(&inode->i_data, 0);

  	if (!inode->i_nlink) {
  		inode->i_size = 0;
  		minix_truncate(inode);
  	}
  	invalidate_inode_buffers(inode);
  	end_writeback(inode);
  	if (!inode->i_nlink)
  		minix_free_inode(inode);

  }
  
  static void minix_put_super(struct super_block *sb)
  {
  	int i;
  	struct minix_sb_info *sbi = minix_sb(sb);
  
  	if (!(sb->s_flags & MS_RDONLY)) {

  		if (sbi->s_version != MINIX_V3)	 /* s_state is now out from V3 sb */
  			sbi->s_ms->s_state = sbi->s_mount_state;

  		mark_buffer_dirty(sbi->s_sbh);
  	}
  	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]);
  	brelse (sbi->s_sbh);
  	kfree(sbi->s_imap);
  	sb->s_fs_info = NULL;
  	kfree(sbi);

  }

  static struct kmem_cache * minix_inode_cachep;

  
  static struct inode *minix_alloc_inode(struct super_block *sb)
  {
  	struct minix_inode_info *ei;

  	ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);

  	if (!ei)
  		return NULL;
  	return &ei->vfs_inode;
  }

  static void minix_i_callback(struct rcu_head *head)

  {

  	struct inode *inode = container_of(head, struct inode, i_rcu);

  	kmem_cache_free(minix_inode_cachep, minix_i(inode));
  }

  static void minix_destroy_inode(struct inode *inode)
  {
  	call_rcu(&inode->i_rcu, minix_i_callback);
  }

  static void init_once(void *foo)

  {
  	struct minix_inode_info *ei = (struct minix_inode_info *) foo;

  	inode_init_once(&ei->vfs_inode);

  }

  static int init_inodecache(void)
  {
  	minix_inode_cachep = kmem_cache_create("minix_inode_cache",
  					     sizeof(struct minix_inode_info),

  					     0, (SLAB_RECLAIM_ACCOUNT|
  						SLAB_MEM_SPREAD),

  					     init_once);

  	if (minix_inode_cachep == NULL)
  		return -ENOMEM;
  	return 0;
  }
  
  static void destroy_inodecache(void)
  {

  	kmem_cache_destroy(minix_inode_cachep);

  }

  static const struct super_operations minix_sops = {

  	.alloc_inode	= minix_alloc_inode,
  	.destroy_inode	= minix_destroy_inode,

  	.write_inode	= minix_write_inode,

  	.evict_inode	= minix_evict_inode,

  	.put_super	= minix_put_super,
  	.statfs		= minix_statfs,
  	.remount_fs	= minix_remount,
  };
  
  static int minix_remount (struct super_block * sb, int * flags, char * data)
  {
  	struct minix_sb_info * sbi = minix_sb(sb);
  	struct minix_super_block * ms;
  
  	ms = sbi->s_ms;
  	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
  		return 0;
  	if (*flags & MS_RDONLY) {
  		if (ms->s_state & MINIX_VALID_FS ||
  		    !(sbi->s_mount_state & MINIX_VALID_FS))
  			return 0;
  		/* Mounting a rw partition read-only. */

  		if (sbi->s_version != MINIX_V3)
  			ms->s_state = sbi->s_mount_state;

  		mark_buffer_dirty(sbi->s_sbh);
  	} else {
  	  	/* Mount a partition which is read-only, read-write. */

  		if (sbi->s_version != MINIX_V3) {
  			sbi->s_mount_state = ms->s_state;
  			ms->s_state &= ~MINIX_VALID_FS;
  		} else {
  			sbi->s_mount_state = MINIX_VALID_FS;
  		}

  		mark_buffer_dirty(sbi->s_sbh);
  
  		if (!(sbi->s_mount_state & MINIX_VALID_FS))

  			printk("MINIX-fs warning: remounting unchecked fs, "
  				"running fsck is recommended
  ");

  		else if ((sbi->s_mount_state & MINIX_ERROR_FS))

  			printk("MINIX-fs warning: remounting fs with errors, "
  				"running fsck is recommended
  ");

  	}
  	return 0;
  }
  
  static int minix_fill_super(struct super_block *s, void *data, int silent)
  {
  	struct buffer_head *bh;
  	struct buffer_head **map;
  	struct minix_super_block *ms;

  	struct minix3_super_block *m3s = NULL;
  	unsigned long i, block;

  	struct inode *root_inode;
  	struct minix_sb_info *sbi;

  	int ret = -EINVAL;

  	sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);

  	if (!sbi)
  		return -ENOMEM;
  	s->s_fs_info = sbi;

  	BUILD_BUG_ON(32 != sizeof (struct minix_inode));
  	BUILD_BUG_ON(64 != sizeof(struct minix2_inode));

  
  	if (!sb_set_blocksize(s, BLOCK_SIZE))
  		goto out_bad_hblock;
  
  	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 if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
  		m3s = (struct minix3_super_block *) bh->b_data;
  		s->s_magic = m3s->s_magic;
  		sbi->s_imap_blocks = m3s->s_imap_blocks;
  		sbi->s_zmap_blocks = m3s->s_zmap_blocks;
  		sbi->s_firstdatazone = m3s->s_firstdatazone;
  		sbi->s_log_zone_size = m3s->s_log_zone_size;
  		sbi->s_max_size = m3s->s_max_size;
  		sbi->s_ninodes = m3s->s_ninodes;
  		sbi->s_nzones = m3s->s_zones;
  		sbi->s_dirsize = 64;
  		sbi->s_namelen = 60;
  		sbi->s_version = MINIX_V3;
  		sbi->s_link_max = MINIX2_LINK_MAX;
  		sbi->s_mount_state = MINIX_VALID_FS;
  		sb_set_blocksize(s, m3s->s_blocksize);

  	} else
  		goto out_no_fs;
  
  	/*
  	 * Allocate the buffer map to keep the superblock small.
  	 */

  	if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
  		goto out_illegal_sb;

  	i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);

  	map = kzalloc(i, GFP_KERNEL);

  	if (!map)
  		goto out_no_map;

  	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 = minix_iget(s, MINIX_ROOT_INO);
  	if (IS_ERR(root_inode)) {
  		ret = PTR_ERR(root_inode);

  		goto out_no_root;

  	}

  	/* Apparently minix can create filesystems that allocate more blocks for
  	 * the bitmaps than needed.  We simply ignore that, but verify it didn't
  	 * create one with not enough blocks and bail out if so.
  	 */
  	block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
  	if (sbi->s_imap_blocks < block) {
  		printk("MINIX-fs: file system does not have enough "
  				"imap blocks allocated.  Refusing to mount
  ");
  		goto out_iput;
  	}
  
  	block = minix_blocks_needed(
  			(sbi->s_nzones - (sbi->s_firstdatazone + 1)),
  			s->s_blocksize);
  	if (sbi->s_zmap_blocks < block) {
  		printk("MINIX-fs: file system does not have enough "
  				"zmap blocks allocated.  Refusing to mount.
  ");
  		goto out_iput;
  	}

  	ret = -ENOMEM;
  	s->s_root = d_alloc_root(root_inode);
  	if (!s->s_root)
  		goto out_iput;
  
  	if (!(s->s_flags & MS_RDONLY)) {
  		if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
  			ms->s_state &= ~MINIX_VALID_FS;
  		mark_buffer_dirty(bh);
  	}
  	if (!(sbi->s_mount_state & MINIX_VALID_FS))
  		printk("MINIX-fs: mounting unchecked file system, "
  			"running fsck is recommended
  ");
  	else if (sbi->s_mount_state & MINIX_ERROR_FS)
  		printk("MINIX-fs: mounting file system with errors, "
  			"running fsck is recommended
  ");

  	return 0;
  
  out_iput:
  	iput(root_inode);
  	goto out_freemap;
  
  out_no_root:
  	if (!silent)
  		printk("MINIX-fs: get root inode failed
  ");
  	goto out_freemap;
  
  out_no_bitmap:
  	printk("MINIX-fs: bad superblock or unable to read bitmaps
  ");

  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:

  	ret = -ENOMEM;

  	if (!silent)

  		printk("MINIX-fs: can't allocate map
  ");

  	goto out_release;

  out_illegal_sb:
  	if (!silent)
  		printk("MINIX-fs: bad superblock
  ");
  	goto out_release;

  out_no_fs:
  	if (!silent)

  		printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
  		       "on device %s.
  ", s->s_id);

  out_release:

  	brelse(bh);
  	goto out;
  
  out_bad_hblock:

  	printk("MINIX-fs: blocksize too small for device
  ");

  	goto out;
  
  out_bad_sb:
  	printk("MINIX-fs: unable to read superblock
  ");

  out:

  	s->s_fs_info = NULL;
  	kfree(sbi);

  	return ret;

  }

  static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)

  {

  	struct super_block *sb = dentry->d_sb;
  	struct minix_sb_info *sbi = minix_sb(sb);
  	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
  	buf->f_type = sb->s_magic;
  	buf->f_bsize = sb->s_blocksize;

  	buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;

  	buf->f_bfree = minix_count_free_blocks(sb);

  	buf->f_bavail = buf->f_bfree;
  	buf->f_files = sbi->s_ninodes;

  	buf->f_ffree = minix_count_free_inodes(sb);

  	buf->f_namelen = sbi->s_namelen;

  	buf->f_fsid.val[0] = (u32)id;
  	buf->f_fsid.val[1] = (u32)(id >> 32);

  	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, struct writeback_control *wbc)
  {
  	return block_write_full_page(page, minix_get_block, wbc);
  }

  static int minix_readpage(struct file *file, struct page *page)
  {
  	return block_read_full_page(page,minix_get_block);
  }

  int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)

  {

  	return __block_write_begin(page, pos, len, minix_get_block);

  }

  
  static int minix_write_begin(struct file *file, struct address_space *mapping,
  			loff_t pos, unsigned len, unsigned flags,
  			struct page **pagep, void **fsdata)
  {

  	int ret;
  
  	ret = block_write_begin(mapping, pos, len, flags, pagep,

  				minix_get_block);

  	if (unlikely(ret)) {
  		loff_t isize = mapping->host->i_size;
  		if (pos + len > isize)
  			vmtruncate(mapping->host, isize);
  	}
  
  	return ret;

  }

  static sector_t minix_bmap(struct address_space *mapping, sector_t block)
  {
  	return generic_block_bmap(mapping,block,minix_get_block);
  }

  static const struct address_space_operations minix_aops = {

  	.readpage = minix_readpage,
  	.writepage = minix_writepage,

  	.write_begin = minix_write_begin,
  	.write_end = generic_write_end,

  	.bmap = minix_bmap
  };

  static const struct inode_operations minix_symlink_inode_operations = {

  	.readlink	= generic_readlink,
  	.follow_link	= page_follow_link_light,
  	.put_link	= page_put_link,
  	.getattr	= minix_getattr,
  };
  
  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 = &minix_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 struct inode *V1_minix_iget(struct inode *inode)

  {
  	struct buffer_head * bh;
  	struct minix_inode * raw_inode;
  	struct minix_inode_info *minix_inode = minix_i(inode);
  	int i;
  
  	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
  	if (!raw_inode) {

  		iget_failed(inode);
  		return ERR_PTR(-EIO);

  	}
  	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;

  	set_nlink(inode, raw_inode->i_nlinks);

  	inode->i_size = raw_inode->i_size;
  	inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
  	inode->i_mtime.tv_nsec = 0;
  	inode->i_atime.tv_nsec = 0;
  	inode->i_ctime.tv_nsec = 0;

  	inode->i_blocks = 0;

  	for (i = 0; i < 9; i++)
  		minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
  	minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
  	brelse(bh);

  	unlock_new_inode(inode);
  	return inode;

  }
  
  /*
   * The minix V2 function to read an inode.
   */

  static struct inode *V2_minix_iget(struct inode *inode)

  {
  	struct buffer_head * bh;
  	struct minix2_inode * raw_inode;
  	struct minix_inode_info *minix_inode = minix_i(inode);
  	int i;
  
  	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
  	if (!raw_inode) {

  		iget_failed(inode);
  		return ERR_PTR(-EIO);

  	}
  	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;

  	set_nlink(inode, raw_inode->i_nlinks);

  	inode->i_size = raw_inode->i_size;
  	inode->i_mtime.tv_sec = raw_inode->i_mtime;
  	inode->i_atime.tv_sec = raw_inode->i_atime;
  	inode->i_ctime.tv_sec = raw_inode->i_ctime;
  	inode->i_mtime.tv_nsec = 0;
  	inode->i_atime.tv_nsec = 0;
  	inode->i_ctime.tv_nsec = 0;

  	inode->i_blocks = 0;

  	for (i = 0; i < 10; i++)
  		minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
  	minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
  	brelse(bh);

  	unlock_new_inode(inode);
  	return inode;

  }
  
  /*
   * The global function to read an inode.
   */

  struct inode *minix_iget(struct super_block *sb, unsigned long ino)

  {

  	struct inode *inode;
  
  	inode = iget_locked(sb, ino);
  	if (!inode)
  		return ERR_PTR(-ENOMEM);
  	if (!(inode->i_state & I_NEW))
  		return inode;

  	if (INODE_VERSION(inode) == MINIX_V1)

  		return V1_minix_iget(inode);

  	else

  		return V2_minix_iget(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;
  	struct minix_inode_info *minix_inode = minix_i(inode);
  	int i;
  
  	raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
  	if (!raw_inode)
  		return NULL;
  	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.tv_sec;
  	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
  		raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
  	else for (i = 0; i < 9; i++)
  		raw_inode->i_zone[i] = minix_inode->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;
  	struct minix_inode_info *minix_inode = minix_i(inode);
  	int i;
  
  	raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
  	if (!raw_inode)
  		return NULL;
  	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.tv_sec;
  	raw_inode->i_atime = inode->i_atime.tv_sec;
  	raw_inode->i_ctime = inode->i_ctime.tv_sec;
  	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
  		raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
  	else for (i = 0; i < 10; i++)
  		raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
  	mark_buffer_dirty(bh);
  	return bh;
  }

  static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)

  {
  	int err = 0;
  	struct buffer_head *bh;

  	if (INODE_VERSION(inode) == MINIX_V1)
  		bh = V1_minix_update_inode(inode);
  	else
  		bh = V2_minix_update_inode(inode);
  	if (!bh)
  		return -EIO;

  	if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {

  		sync_dirty_buffer(bh);

  		if (buffer_req(bh) && !buffer_uptodate(bh)) {

  			printk("IO error syncing minix inode [%s:%08lx]
  ",

  				inode->i_sb->s_id, inode->i_ino);

  			err = -EIO;

  		}
  	}

  	brelse (bh);
  	return err;
  }
  
  int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
  {

  	struct super_block *sb = dentry->d_sb;

  	generic_fillattr(dentry->d_inode, stat);
  	if (INODE_VERSION(dentry->d_inode) == MINIX_V1)

  		stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);

  	else

  		stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
  	stat->blksize = sb->s_blocksize;

  	return 0;
  }
  
  /*
   * The function that is called for file truncation.
   */
  void minix_truncate(struct inode * inode)
  {
  	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
  		return;
  	if (INODE_VERSION(inode) == MINIX_V1)
  		V1_minix_truncate(inode);
  	else
  		V2_minix_truncate(inode);
  }

  static struct dentry *minix_mount(struct file_system_type *fs_type,
  	int flags, const char *dev_name, void *data)

  {

  	return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);

  }
  
  static struct file_system_type minix_fs_type = {
  	.owner		= THIS_MODULE,
  	.name		= "minix",

  	.mount		= minix_mount,

  	.kill_sb	= kill_block_super,
  	.fs_flags	= FS_REQUIRES_DEV,
  };
  
  static int __init init_minix_fs(void)
  {
  	int err = init_inodecache();
  	if (err)
  		goto out1;
  	err = register_filesystem(&minix_fs_type);
  	if (err)
  		goto out;
  	return 0;
  out:
  	destroy_inodecache();
  out1:
  	return err;
  }
  
  static void __exit exit_minix_fs(void)
  {
          unregister_filesystem(&minix_fs_type);
  	destroy_inodecache();
  }
  
  module_init(init_minix_fs)
  module_exit(exit_minix_fs)
  MODULE_LICENSE("GPL");