/*
   *  linux/fs/ufs/super.c
   *
   * Copyright (C) 1998
   * Daniel Pirkl <daniel.pirkl@email.cz>
   * Charles University, Faculty of Mathematics and Physics
   */
  
  /* Derived from
   *
   *  linux/fs/ext2/super.c
   *
   * Copyright (C) 1992, 1993, 1994, 1995
   * Remy Card (card@masi.ibp.fr)
   * Laboratoire MASI - Institut Blaise Pascal
   * Universite Pierre et Marie Curie (Paris VI)
   *
   *  from
   *
   *  linux/fs/minix/inode.c
   *
   *  Copyright (C) 1991, 1992  Linus Torvalds
   *
   *  Big-endian to little-endian byte-swapping/bitmaps by
   *        David S. Miller (davem@caip.rutgers.edu), 1995
   */
   
  /*
   * Inspired by
   *
   *  linux/fs/ufs/super.c
   *
   * Copyright (C) 1996
   * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
   * Laboratory for Computer Science Research Computing Facility
   * Rutgers, The State University of New Jersey
   *
   * Copyright (C) 1996  Eddie C. Dost  (ecd@skynet.be)
   *
   * Kernel module support added on 96/04/26 by
   * Stefan Reinauer <stepan@home.culture.mipt.ru>
   *
   * Module usage counts added on 96/04/29 by

   * Gertjan van Wingerde <gwingerde@gmail.com>

   *
   * Clean swab support on 19970406 by
   * Francois-Rene Rideau <fare@tunes.org>
   *
   * 4.4BSD (FreeBSD) support added on February 1st 1998 by
   * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
   * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
   *
   * NeXTstep support added on February 5th 1998 by
   * Niels Kristian Bech Jensen <nkbj@image.dk>.
   *
   * write support Daniel Pirkl <daniel.pirkl@email.cz> 1998
   * 
   * HP/UX hfs filesystem support added by
   * Martin K. Petersen <mkp@mkp.net>, August 1999
   *
   * UFS2 (of FreeBSD 5.x) support added by
   * Niraj Kumar <niraj17@iitbombay.org>, Jan 2004
   *

   * UFS2 write support added by
   * Evgeniy Dushistov <dushistov@mail.ru>, 2007

   */

  #include <linux/exportfs.h>

  #include <linux/module.h>
  #include <linux/bitops.h>
  
  #include <stdarg.h>
  
  #include <asm/uaccess.h>

  
  #include <linux/errno.h>
  #include <linux/fs.h>

  #include <linux/slab.h>
  #include <linux/time.h>
  #include <linux/stat.h>
  #include <linux/string.h>
  #include <linux/blkdev.h>
  #include <linux/init.h>
  #include <linux/parser.h>

  #include <linux/buffer_head.h>
  #include <linux/vfs.h>

  #include <linux/log2.h>

  #include <linux/mount.h>
  #include <linux/seq_file.h>

  #include "ufs_fs.h"

  #include "ufs.h"

  #include "swab.h"
  #include "util.h"

  void lock_ufs(struct super_block *sb)
  {
  #if defined(CONFIG_SMP) || defined (CONFIG_PREEMPT)
  	struct ufs_sb_info *sbi = UFS_SB(sb);
  
  	mutex_lock(&sbi->mutex);
  	sbi->mutex_owner = current;
  #endif
  }
  
  void unlock_ufs(struct super_block *sb)
  {
  #if defined(CONFIG_SMP) || defined (CONFIG_PREEMPT)
  	struct ufs_sb_info *sbi = UFS_SB(sb);
  
  	sbi->mutex_owner = NULL;
  	mutex_unlock(&sbi->mutex);
  #endif
  }

  static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
  {
  	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
  	struct inode *inode;
  
  	if (ino < UFS_ROOTINO || ino > uspi->s_ncg * uspi->s_ipg)
  		return ERR_PTR(-ESTALE);
  
  	inode = ufs_iget(sb, ino);
  	if (IS_ERR(inode))
  		return ERR_CAST(inode);
  	if (generation && inode->i_generation != generation) {
  		iput(inode);
  		return ERR_PTR(-ESTALE);
  	}
  	return inode;
  }
  
  static struct dentry *ufs_fh_to_dentry(struct super_block *sb, struct fid *fid,
  				       int fh_len, int fh_type)
  {
  	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
  }
  
  static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid,
  				       int fh_len, int fh_type)
  {
  	return generic_fh_to_parent(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
  }
  
  static struct dentry *ufs_get_parent(struct dentry *child)
  {

  	struct qstr dot_dot = QSTR_INIT("..", 2);

  	ino_t ino;
  
  	ino = ufs_inode_by_name(child->d_inode, &dot_dot);
  	if (!ino)
  		return ERR_PTR(-ENOENT);
  	return d_obtain_alias(ufs_iget(child->d_inode->i_sb, ino));
  }
  
  static const struct export_operations ufs_export_ops = {
  	.fh_to_dentry	= ufs_fh_to_dentry,
  	.fh_to_parent	= ufs_fh_to_parent,
  	.get_parent	= ufs_get_parent,
  };

  #ifdef CONFIG_UFS_DEBUG

  /*
   * Print contents of ufs_super_block, useful for debugging
   */

  static void ufs_print_super_stuff(struct super_block *sb,

  				  struct ufs_super_block_first *usb1,
  				  struct ufs_super_block_second *usb2,
  				  struct ufs_super_block_third *usb3)

  {

  	u32 magic = fs32_to_cpu(sb, usb3->fs_magic);

  	printk("ufs_print_super_stuff
  ");

  	printk("  magic:     0x%x
  ", magic);
  	if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) {

  		printk("  fs_size:   %llu
  ", (unsigned long long)
  		       fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size));
  		printk("  fs_dsize:  %llu
  ", (unsigned long long)
  		       fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize));
  		printk("  bsize:         %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_bsize));
  		printk("  fsize:         %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_fsize));
  		printk("  fs_volname:  %s
  ", usb2->fs_un.fs_u2.fs_volname);
  		printk("  fs_sblockloc: %llu
  ", (unsigned long long)
  		       fs64_to_cpu(sb, usb2->fs_un.fs_u2.fs_sblockloc));
  		printk("  cs_ndir(No of dirs):  %llu
  ", (unsigned long long)
  		       fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir));
  		printk("  cs_nbfree(No of free blocks):  %llu
  ",
  		       (unsigned long long)
  		       fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree));

  		printk(KERN_INFO"  cs_nifree(Num of free inodes): %llu
  ",
  		       (unsigned long long)
  		       fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree));
  		printk(KERN_INFO"  cs_nffree(Num of free frags): %llu
  ",
  		       (unsigned long long)
  		       fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree));

  		printk(KERN_INFO"  fs_maxsymlinklen: %u
  ",
  		       fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen));

  	} else {
  		printk(" sblkno:      %u
  ", fs32_to_cpu(sb, usb1->fs_sblkno));
  		printk(" cblkno:      %u
  ", fs32_to_cpu(sb, usb1->fs_cblkno));
  		printk(" iblkno:      %u
  ", fs32_to_cpu(sb, usb1->fs_iblkno));
  		printk(" dblkno:      %u
  ", fs32_to_cpu(sb, usb1->fs_dblkno));
  		printk(" cgoffset:    %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_cgoffset));
  		printk(" ~cgmask:     0x%x
  ",
  		       ~fs32_to_cpu(sb, usb1->fs_cgmask));
  		printk(" size:        %u
  ", fs32_to_cpu(sb, usb1->fs_size));
  		printk(" dsize:       %u
  ", fs32_to_cpu(sb, usb1->fs_dsize));
  		printk(" ncg:         %u
  ", fs32_to_cpu(sb, usb1->fs_ncg));
  		printk(" bsize:       %u
  ", fs32_to_cpu(sb, usb1->fs_bsize));
  		printk(" fsize:       %u
  ", fs32_to_cpu(sb, usb1->fs_fsize));
  		printk(" frag:        %u
  ", fs32_to_cpu(sb, usb1->fs_frag));
  		printk(" fragshift:   %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_fragshift));
  		printk(" ~fmask:      %u
  ", ~fs32_to_cpu(sb, usb1->fs_fmask));
  		printk(" fshift:      %u
  ", fs32_to_cpu(sb, usb1->fs_fshift));
  		printk(" sbsize:      %u
  ", fs32_to_cpu(sb, usb1->fs_sbsize));
  		printk(" spc:         %u
  ", fs32_to_cpu(sb, usb1->fs_spc));
  		printk(" cpg:         %u
  ", fs32_to_cpu(sb, usb1->fs_cpg));
  		printk(" ipg:         %u
  ", fs32_to_cpu(sb, usb1->fs_ipg));
  		printk(" fpg:         %u
  ", fs32_to_cpu(sb, usb1->fs_fpg));
  		printk(" csaddr:      %u
  ", fs32_to_cpu(sb, usb1->fs_csaddr));
  		printk(" cssize:      %u
  ", fs32_to_cpu(sb, usb1->fs_cssize));
  		printk(" cgsize:      %u
  ", fs32_to_cpu(sb, usb1->fs_cgsize));
  		printk(" fstodb:      %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_fsbtodb));
  		printk(" nrpos:       %u
  ", fs32_to_cpu(sb, usb3->fs_nrpos));
  		printk(" ndir         %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
  		printk(" nifree       %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
  		printk(" nbfree       %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
  		printk(" nffree       %u
  ",
  		       fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
  	}

  	printk("
  ");
  }
  
  /*
   * Print contents of ufs_cylinder_group, useful for debugging
   */

  static void ufs_print_cylinder_stuff(struct super_block *sb,
  				     struct ufs_cylinder_group *cg)

  {
  	printk("
  ufs_print_cylinder_stuff
  ");

  	printk("size of ucg: %zu
  ", sizeof(struct ufs_cylinder_group));

  	printk("  magic:        %x
  ", fs32_to_cpu(sb, cg->cg_magic));
  	printk("  time:         %u
  ", fs32_to_cpu(sb, cg->cg_time));
  	printk("  cgx:          %u
  ", fs32_to_cpu(sb, cg->cg_cgx));
  	printk("  ncyl:         %u
  ", fs16_to_cpu(sb, cg->cg_ncyl));
  	printk("  niblk:        %u
  ", fs16_to_cpu(sb, cg->cg_niblk));
  	printk("  ndblk:        %u
  ", fs32_to_cpu(sb, cg->cg_ndblk));
  	printk("  cs_ndir:      %u
  ", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
  	printk("  cs_nbfree:    %u
  ", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
  	printk("  cs_nifree:    %u
  ", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
  	printk("  cs_nffree:    %u
  ", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
  	printk("  rotor:        %u
  ", fs32_to_cpu(sb, cg->cg_rotor));
  	printk("  frotor:       %u
  ", fs32_to_cpu(sb, cg->cg_frotor));
  	printk("  irotor:       %u
  ", fs32_to_cpu(sb, cg->cg_irotor));
  	printk("  frsum:        %u, %u, %u, %u, %u, %u, %u, %u
  ",
  	    fs32_to_cpu(sb, cg->cg_frsum[0]), fs32_to_cpu(sb, cg->cg_frsum[1]),
  	    fs32_to_cpu(sb, cg->cg_frsum[2]), fs32_to_cpu(sb, cg->cg_frsum[3]),
  	    fs32_to_cpu(sb, cg->cg_frsum[4]), fs32_to_cpu(sb, cg->cg_frsum[5]),
  	    fs32_to_cpu(sb, cg->cg_frsum[6]), fs32_to_cpu(sb, cg->cg_frsum[7]));
  	printk("  btotoff:      %u
  ", fs32_to_cpu(sb, cg->cg_btotoff));
  	printk("  boff:         %u
  ", fs32_to_cpu(sb, cg->cg_boff));
  	printk("  iuseoff:      %u
  ", fs32_to_cpu(sb, cg->cg_iusedoff));
  	printk("  freeoff:      %u
  ", fs32_to_cpu(sb, cg->cg_freeoff));
  	printk("  nextfreeoff:  %u
  ", fs32_to_cpu(sb, cg->cg_nextfreeoff));

  	printk("  clustersumoff %u
  ",
  	       fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clustersumoff));
  	printk("  clusteroff    %u
  ",
  	       fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clusteroff));
  	printk("  nclusterblks  %u
  ",
  	       fs32_to_cpu(sb, cg->cg_u.cg_44.cg_nclusterblks));

  	printk("
  ");
  }

  #else

  #  define ufs_print_super_stuff(sb, usb1, usb2, usb3) /**/

  #  define ufs_print_cylinder_stuff(sb, cg) /**/

  #endif /* CONFIG_UFS_DEBUG */

  static const struct super_operations ufs_super_ops;

  
  static char error_buf[1024];
  
  void ufs_error (struct super_block * sb, const char * function,
  	const char * fmt, ...)
  {
  	struct ufs_sb_private_info * uspi;
  	struct ufs_super_block_first * usb1;
  	va_list args;
  
  	uspi = UFS_SB(sb)->s_uspi;

  	usb1 = ubh_get_usb_first(uspi);

  	
  	if (!(sb->s_flags & MS_RDONLY)) {
  		usb1->fs_clean = UFS_FSBAD;

  		ubh_mark_buffer_dirty(USPI_UBH(uspi));

  		ufs_mark_sb_dirty(sb);

  		sb->s_flags |= MS_RDONLY;
  	}
  	va_start (args, fmt);

  	vsnprintf (error_buf, sizeof(error_buf), fmt, args);

  	va_end (args);
  	switch (UFS_SB(sb)->s_mount_opt & UFS_MOUNT_ONERROR) {
  	case UFS_MOUNT_ONERROR_PANIC:
  		panic ("UFS-fs panic (device %s): %s: %s
  ", 
  			sb->s_id, function, error_buf);
  
  	case UFS_MOUNT_ONERROR_LOCK:
  	case UFS_MOUNT_ONERROR_UMOUNT:
  	case UFS_MOUNT_ONERROR_REPAIR:
  		printk (KERN_CRIT "UFS-fs error (device %s): %s: %s
  ",
  			sb->s_id, function, error_buf);
  	}		
  }
  
  void ufs_panic (struct super_block * sb, const char * function,
  	const char * fmt, ...)
  {
  	struct ufs_sb_private_info * uspi;
  	struct ufs_super_block_first * usb1;
  	va_list args;
  	
  	uspi = UFS_SB(sb)->s_uspi;

  	usb1 = ubh_get_usb_first(uspi);

  	
  	if (!(sb->s_flags & MS_RDONLY)) {
  		usb1->fs_clean = UFS_FSBAD;

  		ubh_mark_buffer_dirty(USPI_UBH(uspi));

  		ufs_mark_sb_dirty(sb);

  	}
  	va_start (args, fmt);

  	vsnprintf (error_buf, sizeof(error_buf), fmt, args);

  	va_end (args);
  	sb->s_flags |= MS_RDONLY;
  	printk (KERN_CRIT "UFS-fs panic (device %s): %s: %s
  ",
  		sb->s_id, function, error_buf);
  }
  
  void ufs_warning (struct super_block * sb, const char * function,
  	const char * fmt, ...)
  {
  	va_list args;
  
  	va_start (args, fmt);

  	vsnprintf (error_buf, sizeof(error_buf), fmt, args);

  	va_end (args);
  	printk (KERN_WARNING "UFS-fs warning (device %s): %s: %s
  ",
  		sb->s_id, function, error_buf);
  }
  
  enum {

         Opt_type_old = UFS_MOUNT_UFSTYPE_OLD,
         Opt_type_sunx86 = UFS_MOUNT_UFSTYPE_SUNx86,
         Opt_type_sun = UFS_MOUNT_UFSTYPE_SUN,
         Opt_type_sunos = UFS_MOUNT_UFSTYPE_SUNOS,
         Opt_type_44bsd = UFS_MOUNT_UFSTYPE_44BSD,
         Opt_type_ufs2 = UFS_MOUNT_UFSTYPE_UFS2,
         Opt_type_hp = UFS_MOUNT_UFSTYPE_HP,
         Opt_type_nextstepcd = UFS_MOUNT_UFSTYPE_NEXTSTEP_CD,
         Opt_type_nextstep = UFS_MOUNT_UFSTYPE_NEXTSTEP,
         Opt_type_openstep = UFS_MOUNT_UFSTYPE_OPENSTEP,
         Opt_onerror_panic = UFS_MOUNT_ONERROR_PANIC,
         Opt_onerror_lock = UFS_MOUNT_ONERROR_LOCK,
         Opt_onerror_umount = UFS_MOUNT_ONERROR_UMOUNT,
         Opt_onerror_repair = UFS_MOUNT_ONERROR_REPAIR,
         Opt_err

  };

  static const match_table_t tokens = {

  	{Opt_type_old, "ufstype=old"},
  	{Opt_type_sunx86, "ufstype=sunx86"},
  	{Opt_type_sun, "ufstype=sun"},

  	{Opt_type_sunos, "ufstype=sunos"},

  	{Opt_type_44bsd, "ufstype=44bsd"},
  	{Opt_type_ufs2, "ufstype=ufs2"},
  	{Opt_type_ufs2, "ufstype=5xbsd"},
  	{Opt_type_hp, "ufstype=hp"},
  	{Opt_type_nextstepcd, "ufstype=nextstep-cd"},
  	{Opt_type_nextstep, "ufstype=nextstep"},
  	{Opt_type_openstep, "ufstype=openstep"},

  /*end of possible ufs types */

  	{Opt_onerror_panic, "onerror=panic"},
  	{Opt_onerror_lock, "onerror=lock"},
  	{Opt_onerror_umount, "onerror=umount"},
  	{Opt_onerror_repair, "onerror=repair"},
  	{Opt_err, NULL}
  };
  
  static int ufs_parse_options (char * options, unsigned * mount_options)
  {
  	char * p;
  	

  	UFSD("ENTER
  ");

  	
  	if (!options)
  		return 1;
  
  	while ((p = strsep(&options, ",")) != NULL) {
  		substring_t args[MAX_OPT_ARGS];
  		int token;
  		if (!*p)
  			continue;
  
  		token = match_token(p, tokens, args);
  		switch (token) {
  		case Opt_type_old:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_OLD);
  			break;
  		case Opt_type_sunx86:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_SUNx86);
  			break;
  		case Opt_type_sun:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_SUN);
  			break;

  		case Opt_type_sunos:
  			ufs_clear_opt(*mount_options, UFSTYPE);
  			ufs_set_opt(*mount_options, UFSTYPE_SUNOS);
  			break;

  		case Opt_type_44bsd:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_44BSD);
  			break;
  		case Opt_type_ufs2:
  			ufs_clear_opt(*mount_options, UFSTYPE);
  			ufs_set_opt(*mount_options, UFSTYPE_UFS2);
  			break;
  		case Opt_type_hp:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_HP);
  			break;
  		case Opt_type_nextstepcd:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP_CD);
  			break;
  		case Opt_type_nextstep:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP);
  			break;
  		case Opt_type_openstep:
  			ufs_clear_opt (*mount_options, UFSTYPE);
  			ufs_set_opt (*mount_options, UFSTYPE_OPENSTEP);
  			break;
  		case Opt_onerror_panic:
  			ufs_clear_opt (*mount_options, ONERROR);
  			ufs_set_opt (*mount_options, ONERROR_PANIC);
  			break;
  		case Opt_onerror_lock:
  			ufs_clear_opt (*mount_options, ONERROR);
  			ufs_set_opt (*mount_options, ONERROR_LOCK);
  			break;
  		case Opt_onerror_umount:
  			ufs_clear_opt (*mount_options, ONERROR);
  			ufs_set_opt (*mount_options, ONERROR_UMOUNT);
  			break;
  		case Opt_onerror_repair:
  			printk("UFS-fs: Unable to do repair on error, "
  				"will lock lock instead
  ");
  			ufs_clear_opt (*mount_options, ONERROR);
  			ufs_set_opt (*mount_options, ONERROR_REPAIR);
  			break;
  		default:
  			printk("UFS-fs: Invalid option: \"%s\" "
  					"or missing value
  ", p);
  			return 0;
  		}
  	}
  	return 1;
  }
  
  /*

   * Different types of UFS hold fs_cstotal in different
   * places, and use different data structure for it.
   * To make things simpler we just copy fs_cstotal to ufs_sb_private_info

   */

  static void ufs_setup_cstotal(struct super_block *sb)

  {

  	struct ufs_sb_info *sbi = UFS_SB(sb);
  	struct ufs_sb_private_info *uspi = sbi->s_uspi;

  	struct ufs_super_block_first *usb1;
  	struct ufs_super_block_second *usb2;

  	struct ufs_super_block_third *usb3;

  	unsigned mtype = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE;
  
  	UFSD("ENTER, mtype=%u
  ", mtype);
  	usb1 = ubh_get_usb_first(uspi);
  	usb2 = ubh_get_usb_second(uspi);
  	usb3 = ubh_get_usb_third(uspi);
  
  	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
  	     (usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
  	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
  		/*we have statistic in different place, then usual*/
  		uspi->cs_total.cs_ndir = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir);
  		uspi->cs_total.cs_nbfree = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree);
  		uspi->cs_total.cs_nifree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
  		uspi->cs_total.cs_nffree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
  	} else {
  		uspi->cs_total.cs_ndir = fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir);
  		uspi->cs_total.cs_nbfree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree);
  		uspi->cs_total.cs_nifree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
  		uspi->cs_total.cs_nffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
  	}
  	UFSD("EXIT
  ");
  }
  
  /*
   * Read on-disk structures associated with cylinder groups
   */
  static int ufs_read_cylinder_structures(struct super_block *sb)
  {
  	struct ufs_sb_info *sbi = UFS_SB(sb);
  	struct ufs_sb_private_info *uspi = sbi->s_uspi;

  	struct ufs_buffer_head * ubh;
  	unsigned char * base, * space;
  	unsigned size, blks, i;

  	struct ufs_super_block_third *usb3;

  	UFSD("ENTER
  ");

  	usb3 = ubh_get_usb_third(uspi);

  	/*
  	 * Read cs structures from (usually) first data block
  	 * on the device. 
  	 */
  	size = uspi->s_cssize;
  	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;

  	base = space = kmalloc(size, GFP_NOFS);

  	if (!base)
  		goto failed; 

  	sbi->s_csp = (struct ufs_csum *)space;

  	for (i = 0; i < blks; i += uspi->s_fpb) {
  		size = uspi->s_bsize;
  		if (i + uspi->s_fpb > blks)
  			size = (blks - i) * uspi->s_fsize;

  		ubh = ubh_bread(sb, uspi->s_csaddr + i, size);

  		
  		if (!ubh)
  			goto failed;
  
  		ubh_ubhcpymem (space, ubh, size);

  		space += size;
  		ubh_brelse (ubh);
  		ubh = NULL;
  	}
  
  	/*
  	 * Read cylinder group (we read only first fragment from block
  	 * at this time) and prepare internal data structures for cg caching.
  	 */

  	if (!(sbi->s_ucg = kmalloc (sizeof(struct buffer_head *) * uspi->s_ncg, GFP_NOFS)))

  		goto failed;
  	for (i = 0; i < uspi->s_ncg; i++) 
  		sbi->s_ucg[i] = NULL;
  	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
  		sbi->s_ucpi[i] = NULL;
  		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
  	}
  	for (i = 0; i < uspi->s_ncg; i++) {

  		UFSD("read cg %u
  ", i);

  		if (!(sbi->s_ucg[i] = sb_bread(sb, ufs_cgcmin(i))))
  			goto failed;
  		if (!ufs_cg_chkmagic (sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data))
  			goto failed;

  		ufs_print_cylinder_stuff(sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data);

  	}
  	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {

  		if (!(sbi->s_ucpi[i] = kmalloc (sizeof(struct ufs_cg_private_info), GFP_NOFS)))

  			goto failed;
  		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
  	}
  	sbi->s_cg_loaded = 0;

  	UFSD("EXIT
  ");

  	return 1;
  
  failed:

  	kfree (base);

  	if (sbi->s_ucg) {
  		for (i = 0; i < uspi->s_ncg; i++)

  			if (sbi->s_ucg[i])
  				brelse (sbi->s_ucg[i]);

  		kfree (sbi->s_ucg);
  		for (i = 0; i < UFS_MAX_GROUP_LOADED; i++)

  			kfree (sbi->s_ucpi[i]);

  	}

  	UFSD("EXIT (FAILED)
  ");

  	return 0;
  }
  
  /*

   * Sync our internal copy of fs_cstotal with disk

   */

  static void ufs_put_cstotal(struct super_block *sb)

  {

  	unsigned mtype = UFS_SB(sb)->s_mount_opt & UFS_MOUNT_UFSTYPE;
  	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
  	struct ufs_super_block_first *usb1;
  	struct ufs_super_block_second *usb2;
  	struct ufs_super_block_third *usb3;
  
  	UFSD("ENTER
  ");
  	usb1 = ubh_get_usb_first(uspi);
  	usb2 = ubh_get_usb_second(uspi);
  	usb3 = ubh_get_usb_third(uspi);
  
  	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
  	     (usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
  	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
  		/*we have statistic in different place, then usual*/
  		usb2->fs_un.fs_u2.cs_ndir =
  			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
  		usb2->fs_un.fs_u2.cs_nbfree =
  			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
  		usb3->fs_un1.fs_u2.cs_nifree =
  			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
  		usb3->fs_un1.fs_u2.cs_nffree =
  			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
  	} else {
  		usb1->fs_cstotal.cs_ndir =
  			cpu_to_fs32(sb, uspi->cs_total.cs_ndir);
  		usb1->fs_cstotal.cs_nbfree =
  			cpu_to_fs32(sb, uspi->cs_total.cs_nbfree);
  		usb1->fs_cstotal.cs_nifree =
  			cpu_to_fs32(sb, uspi->cs_total.cs_nifree);
  		usb1->fs_cstotal.cs_nffree =
  			cpu_to_fs32(sb, uspi->cs_total.cs_nffree);
  	}
  	ubh_mark_buffer_dirty(USPI_UBH(uspi));

  	ufs_print_super_stuff(sb, usb1, usb2, usb3);

  	UFSD("EXIT
  ");
  }
  
  /**
   * ufs_put_super_internal() - put on-disk intrenal structures
   * @sb: pointer to super_block structure
   * Put on-disk structures associated with cylinder groups
   * and write them back to disk, also update cs_total on disk
   */
  static void ufs_put_super_internal(struct super_block *sb)
  {
  	struct ufs_sb_info *sbi = UFS_SB(sb);
  	struct ufs_sb_private_info *uspi = sbi->s_uspi;

  	struct ufs_buffer_head * ubh;
  	unsigned char * base, * space;
  	unsigned blks, size, i;

  	UFSD("ENTER
  ");

  	ufs_put_cstotal(sb);

  	size = uspi->s_cssize;
  	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;

  	base = space = (char*) sbi->s_csp;

  	for (i = 0; i < blks; i += uspi->s_fpb) {
  		size = uspi->s_bsize;
  		if (i + uspi->s_fpb > blks)
  			size = (blks - i) * uspi->s_fsize;

  		ubh = ubh_bread(sb, uspi->s_csaddr + i, size);

  		ubh_memcpyubh (ubh, space, size);
  		space += size;
  		ubh_mark_buffer_uptodate (ubh, 1);
  		ubh_mark_buffer_dirty (ubh);
  		ubh_brelse (ubh);
  	}
  	for (i = 0; i < sbi->s_cg_loaded; i++) {
  		ufs_put_cylinder (sb, i);
  		kfree (sbi->s_ucpi[i]);
  	}
  	for (; i < UFS_MAX_GROUP_LOADED; i++) 
  		kfree (sbi->s_ucpi[i]);
  	for (i = 0; i < uspi->s_ncg; i++) 
  		brelse (sbi->s_ucg[i]);
  	kfree (sbi->s_ucg);
  	kfree (base);

  	UFSD("EXIT
  ");

  }

  static int ufs_sync_fs(struct super_block *sb, int wait)
  {
  	struct ufs_sb_private_info * uspi;
  	struct ufs_super_block_first * usb1;
  	struct ufs_super_block_third * usb3;
  	unsigned flags;
  
  	lock_ufs(sb);

  	mutex_lock(&UFS_SB(sb)->s_lock);

  
  	UFSD("ENTER
  ");
  
  	flags = UFS_SB(sb)->s_flags;
  	uspi = UFS_SB(sb)->s_uspi;
  	usb1 = ubh_get_usb_first(uspi);
  	usb3 = ubh_get_usb_third(uspi);
  
  	usb1->fs_time = cpu_to_fs32(sb, get_seconds());
  	if ((flags & UFS_ST_MASK) == UFS_ST_SUN  ||
  	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
  	    (flags & UFS_ST_MASK) == UFS_ST_SUNx86)
  		ufs_set_fs_state(sb, usb1, usb3,
  				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
  	ufs_put_cstotal(sb);

  
  	UFSD("EXIT
  ");

  	mutex_unlock(&UFS_SB(sb)->s_lock);

  	unlock_ufs(sb);
  
  	return 0;
  }

  static void delayed_sync_fs(struct work_struct *work)

  {

  	struct ufs_sb_info *sbi;
  
  	sbi = container_of(work, struct ufs_sb_info, sync_work.work);
  
  	spin_lock(&sbi->work_lock);
  	sbi->work_queued = 0;
  	spin_unlock(&sbi->work_lock);
  
  	ufs_sync_fs(sbi->sb, 1);
  }
  
  void ufs_mark_sb_dirty(struct super_block *sb)
  {
  	struct ufs_sb_info *sbi = UFS_SB(sb);
  	unsigned long delay;
  
  	spin_lock(&sbi->work_lock);
  	if (!sbi->work_queued) {
  		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
  		queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
  		sbi->work_queued = 1;
  	}
  	spin_unlock(&sbi->work_lock);

  }
  
  static void ufs_put_super(struct super_block *sb)
  {
  	struct ufs_sb_info * sbi = UFS_SB(sb);
  
  	UFSD("ENTER
  ");
  
  	if (!(sb->s_flags & MS_RDONLY))
  		ufs_put_super_internal(sb);

  	cancel_delayed_work_sync(&sbi->sync_work);

  
  	ubh_brelse_uspi (sbi->s_uspi);
  	kfree (sbi->s_uspi);
  	kfree (sbi);
  	sb->s_fs_info = NULL;
  	UFSD("EXIT
  ");
  	return;
  }

  static int ufs_fill_super(struct super_block *sb, void *data, int silent)
  {
  	struct ufs_sb_info * sbi;
  	struct ufs_sb_private_info * uspi;
  	struct ufs_super_block_first * usb1;
  	struct ufs_super_block_second * usb2;
  	struct ufs_super_block_third * usb3;

  	struct ufs_buffer_head * ubh;	
  	struct inode *inode;
  	unsigned block_size, super_block_size;
  	unsigned flags;

  	unsigned super_block_offset;

  	unsigned maxsymlen;

  	int ret = -EINVAL;

  
  	uspi = NULL;
  	ubh = NULL;
  	flags = 0;
  	

  	UFSD("ENTER
  ");

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

  	if (!sbi)
  		goto failed_nomem;
  	sb->s_fs_info = sbi;

  	sbi->sb = sb;

  	UFSD("flag %u
  ", (int)(sb->s_flags & MS_RDONLY));

  	
  #ifndef CONFIG_UFS_FS_WRITE
  	if (!(sb->s_flags & MS_RDONLY)) {
  		printk("ufs was compiled with read-only support, "
  		"can't be mounted as read-write
  ");
  		goto failed;
  	}
  #endif

  	mutex_init(&sbi->mutex);

  	mutex_init(&sbi->s_lock);

  	spin_lock_init(&sbi->work_lock);
  	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);

  	/*
  	 * Set default mount options
  	 * Parse mount options
  	 */
  	sbi->s_mount_opt = 0;
  	ufs_set_opt (sbi->s_mount_opt, ONERROR_LOCK);
  	if (!ufs_parse_options ((char *) data, &sbi->s_mount_opt)) {
  		printk("wrong mount options
  ");
  		goto failed;
  	}
  	if (!(sbi->s_mount_opt & UFS_MOUNT_UFSTYPE)) {
  		if (!silent)
  			printk("You didn't specify the type of your ufs filesystem
  
  "
  			"mount -t ufs -o ufstype="

  			"sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
  
  "

  			">>>WARNING<<< Wrong ufstype may corrupt your filesystem, "
  			"default is ufstype=old
  ");
  		ufs_set_opt (sbi->s_mount_opt, UFSTYPE_OLD);
  	}

  	uspi = kzalloc(sizeof(struct ufs_sb_private_info), GFP_KERNEL);
  	sbi->s_uspi = uspi;

  	if (!uspi)
  		goto failed;

  	uspi->s_dirblksize = UFS_SECTOR_SIZE;

  	super_block_offset=UFS_SBLOCK;

  	/* Keep 2Gig file limit. Some UFS variants need to override 
  	   this but as I don't know which I'll let those in the know loosen
  	   the rules */

  	switch (sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) {
  	case UFS_MOUNT_UFSTYPE_44BSD:

  		UFSD("ufstype=44bsd
  ");

  		uspi->s_fsize = block_size = 512;
  		uspi->s_fmask = ~(512 - 1);
  		uspi->s_fshift = 9;
  		uspi->s_sbsize = super_block_size = 1536;
  		uspi->s_sbbase = 0;
  		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
  		break;
  	case UFS_MOUNT_UFSTYPE_UFS2:

  		UFSD("ufstype=ufs2
  ");

  		super_block_offset=SBLOCK_UFS2;

  		uspi->s_fsize = block_size = 512;
  		uspi->s_fmask = ~(512 - 1);
  		uspi->s_fshift = 9;
  		uspi->s_sbsize = super_block_size = 1536;
  		uspi->s_sbbase =  0;
  		flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;

  		break;
  		
  	case UFS_MOUNT_UFSTYPE_SUN:

  		UFSD("ufstype=sun
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;

  		uspi->s_maxsymlinklen = 0; /* Not supported on disk */

  		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN;
  		break;

  	case UFS_MOUNT_UFSTYPE_SUNOS:
  		UFSD(("ufstype=sunos
  "))
  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = 2048;
  		super_block_size = 2048;
  		uspi->s_sbbase = 0;
  		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
  		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN;
  		break;

  	case UFS_MOUNT_UFSTYPE_SUNx86:

  		UFSD("ufstype=sunx86
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;

  		uspi->s_maxsymlinklen = 0; /* Not supported on disk */

  		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN;
  		break;
  
  	case UFS_MOUNT_UFSTYPE_OLD:

  		UFSD("ufstype=old
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;
  		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
  		if (!(sb->s_flags & MS_RDONLY)) {
  			if (!silent)
  				printk(KERN_INFO "ufstype=old is supported read-only
  ");
  			sb->s_flags |= MS_RDONLY;
  		}
  		break;
  	
  	case UFS_MOUNT_UFSTYPE_NEXTSTEP:

  		UFSD("ufstype=nextstep
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;

  		uspi->s_dirblksize = 1024;

  		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
  		if (!(sb->s_flags & MS_RDONLY)) {
  			if (!silent)
  				printk(KERN_INFO "ufstype=nextstep is supported read-only
  ");
  			sb->s_flags |= MS_RDONLY;
  		}
  		break;
  	
  	case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD:

  		UFSD("ufstype=nextstep-cd
  ");

  		uspi->s_fsize = block_size = 2048;
  		uspi->s_fmask = ~(2048 - 1);
  		uspi->s_fshift = 11;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;

  		uspi->s_dirblksize = 1024;

  		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
  		if (!(sb->s_flags & MS_RDONLY)) {
  			if (!silent)
  				printk(KERN_INFO "ufstype=nextstep-cd is supported read-only
  ");
  			sb->s_flags |= MS_RDONLY;
  		}
  		break;
  	
  	case UFS_MOUNT_UFSTYPE_OPENSTEP:

  		UFSD("ufstype=openstep
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;

  		uspi->s_dirblksize = 1024;

  		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
  		if (!(sb->s_flags & MS_RDONLY)) {
  			if (!silent)
  				printk(KERN_INFO "ufstype=openstep is supported read-only
  ");
  			sb->s_flags |= MS_RDONLY;
  		}
  		break;
  	
  	case UFS_MOUNT_UFSTYPE_HP:

  		UFSD("ufstype=hp
  ");

  		uspi->s_fsize = block_size = 1024;
  		uspi->s_fmask = ~(1024 - 1);
  		uspi->s_fshift = 10;
  		uspi->s_sbsize = super_block_size = 2048;
  		uspi->s_sbbase = 0;
  		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
  		if (!(sb->s_flags & MS_RDONLY)) {
  			if (!silent)
  				printk(KERN_INFO "ufstype=hp is supported read-only
  ");
  			sb->s_flags |= MS_RDONLY;
   		}
   		break;
  	default:
  		if (!silent)
  			printk("unknown ufstype
  ");
  		goto failed;
  	}
  	
  again:	
  	if (!sb_set_blocksize(sb, block_size)) {
  		printk(KERN_ERR "UFS: failed to set blocksize
  ");
  		goto failed;
  	}
  
  	/*
  	 * read ufs super block from device
  	 */

  
  	ubh = ubh_bread_uspi(uspi, sb, uspi->s_sbbase + super_block_offset/block_size, super_block_size);
  	

  	if (!ubh) 
              goto failed;

  	usb1 = ubh_get_usb_first(uspi);
  	usb2 = ubh_get_usb_second(uspi);
  	usb3 = ubh_get_usb_third(uspi);

  	/* Sort out mod used on SunOS 4.1.3 for fs_state */
  	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
  	if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) &&
  	    (uspi->s_postblformat != UFS_42POSTBLFMT)) {
  		flags &= ~UFS_ST_MASK;
  		flags |=  UFS_ST_SUN;
  	}

  	/*
  	 * Check ufs magic number
  	 */
  	sbi->s_bytesex = BYTESEX_LE;
  	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
  		case UFS_MAGIC:

  		case UFS_MAGIC_BW:

  		case UFS2_MAGIC:
  		case UFS_MAGIC_LFN:
  	        case UFS_MAGIC_FEA:
  	        case UFS_MAGIC_4GB:
  			goto magic_found;
  	}
  	sbi->s_bytesex = BYTESEX_BE;
  	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
  		case UFS_MAGIC:

  		case UFS_MAGIC_BW:

  		case UFS2_MAGIC:
  		case UFS_MAGIC_LFN:
  	        case UFS_MAGIC_FEA:
  	        case UFS_MAGIC_4GB:
  			goto magic_found;
  	}
  
  	if ((((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_NEXTSTEP) 
  	  || ((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_NEXTSTEP_CD) 
  	  || ((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_OPENSTEP)) 
  	  && uspi->s_sbbase < 256) {
  		ubh_brelse_uspi(uspi);
  		ubh = NULL;
  		uspi->s_sbbase += 8;
  		goto again;
  	}
  	if (!silent)
  		printk("ufs_read_super: bad magic number
  ");
  	goto failed;
  
  magic_found:
  	/*
  	 * Check block and fragment sizes
  	 */
  	uspi->s_bsize = fs32_to_cpu(sb, usb1->fs_bsize);
  	uspi->s_fsize = fs32_to_cpu(sb, usb1->fs_fsize);
  	uspi->s_sbsize = fs32_to_cpu(sb, usb1->fs_sbsize);
  	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
  	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);

  	if (!is_power_of_2(uspi->s_fsize)) {

  		printk(KERN_ERR "ufs_read_super: fragment size %u is not a power of 2
  ",
  			uspi->s_fsize);
  			goto failed;
  	}
  	if (uspi->s_fsize < 512) {
  		printk(KERN_ERR "ufs_read_super: fragment size %u is too small
  ",
  			uspi->s_fsize);
  		goto failed;
  	}
  	if (uspi->s_fsize > 4096) {
  		printk(KERN_ERR "ufs_read_super: fragment size %u is too large
  ",
  			uspi->s_fsize);
  		goto failed;
  	}

  	if (!is_power_of_2(uspi->s_bsize)) {

  		printk(KERN_ERR "ufs_read_super: block size %u is not a power of 2
  ",
  			uspi->s_bsize);
  		goto failed;
  	}
  	if (uspi->s_bsize < 4096) {
  		printk(KERN_ERR "ufs_read_super: block size %u is too small
  ",
  			uspi->s_bsize);
  		goto failed;
  	}
  	if (uspi->s_bsize / uspi->s_fsize > 8) {
  		printk(KERN_ERR "ufs_read_super: too many fragments per block (%u)
  ",
  			uspi->s_bsize / uspi->s_fsize);
  		goto failed;
  	}
  	if (uspi->s_fsize != block_size || uspi->s_sbsize != super_block_size) {
  		ubh_brelse_uspi(uspi);
  		ubh = NULL;
  		block_size = uspi->s_fsize;
  		super_block_size = uspi->s_sbsize;

  		UFSD("another value of block_size or super_block_size %u, %u
  ", block_size, super_block_size);

  		goto again;
  	}

  	sbi->s_flags = flags;/*after that line some functions use s_flags*/

  	ufs_print_super_stuff(sb, usb1, usb2, usb3);

  
  	/*
  	 * Check, if file system was correctly unmounted.
  	 * If not, make it read only.
  	 */

  	if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) ||
  	  ((flags & UFS_ST_MASK) == UFS_ST_OLD) ||
  	  (((flags & UFS_ST_MASK) == UFS_ST_SUN ||
  	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
  	  (flags & UFS_ST_MASK) == UFS_ST_SUNx86) &&
  	  (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) {

  		switch(usb1->fs_clean) {
  		case UFS_FSCLEAN:

  			UFSD("fs is clean
  ");

  			break;
  		case UFS_FSSTABLE:

  			UFSD("fs is stable
  ");

  			break;
  		case UFS_FSLOG:
  			UFSD("fs is logging fs
  ");

  			break;
  		case UFS_FSOSF1:

  			UFSD("fs is DEC OSF/1
  ");

  			break;
  		case UFS_FSACTIVE:
  			printk("ufs_read_super: fs is active
  ");
  			sb->s_flags |= MS_RDONLY;
  			break;
  		case UFS_FSBAD:
  			printk("ufs_read_super: fs is bad
  ");
  			sb->s_flags |= MS_RDONLY;
  			break;
  		default:
  			printk("ufs_read_super: can't grok fs_clean 0x%x
  ", usb1->fs_clean);
  			sb->s_flags |= MS_RDONLY;
  			break;
  		}

  	} else {

  		printk("ufs_read_super: fs needs fsck
  ");
  		sb->s_flags |= MS_RDONLY;
  	}
  
  	/*
  	 * Read ufs_super_block into internal data structures
  	 */
  	sb->s_op = &ufs_super_ops;

  	sb->s_export_op = &ufs_export_ops;

  	sb->s_magic = fs32_to_cpu(sb, usb3->fs_magic);
  
  	uspi->s_sblkno = fs32_to_cpu(sb, usb1->fs_sblkno);
  	uspi->s_cblkno = fs32_to_cpu(sb, usb1->fs_cblkno);
  	uspi->s_iblkno = fs32_to_cpu(sb, usb1->fs_iblkno);
  	uspi->s_dblkno = fs32_to_cpu(sb, usb1->fs_dblkno);
  	uspi->s_cgoffset = fs32_to_cpu(sb, usb1->fs_cgoffset);
  	uspi->s_cgmask = fs32_to_cpu(sb, usb1->fs_cgmask);
  
  	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {

  		uspi->s_u2_size  = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size);
  		uspi->s_u2_dsize = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize);
  	} else {

  		uspi->s_size  =  fs32_to_cpu(sb, usb1->fs_size);
  		uspi->s_dsize =  fs32_to_cpu(sb, usb1->fs_dsize);
  	}
  
  	uspi->s_ncg = fs32_to_cpu(sb, usb1->fs_ncg);
  	/* s_bsize already set */
  	/* s_fsize already set */
  	uspi->s_fpb = fs32_to_cpu(sb, usb1->fs_frag);
  	uspi->s_minfree = fs32_to_cpu(sb, usb1->fs_minfree);
  	uspi->s_bmask = fs32_to_cpu(sb, usb1->fs_bmask);
  	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
  	uspi->s_bshift = fs32_to_cpu(sb, usb1->fs_bshift);
  	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);

  	UFSD("uspi->s_bshift = %d,uspi->s_fshift = %d", uspi->s_bshift,
  		uspi->s_fshift);

  	uspi->s_fpbshift = fs32_to_cpu(sb, usb1->fs_fragshift);
  	uspi->s_fsbtodb = fs32_to_cpu(sb, usb1->fs_fsbtodb);
  	/* s_sbsize already set */
  	uspi->s_csmask = fs32_to_cpu(sb, usb1->fs_csmask);
  	uspi->s_csshift = fs32_to_cpu(sb, usb1->fs_csshift);
  	uspi->s_nindir = fs32_to_cpu(sb, usb1->fs_nindir);
  	uspi->s_inopb = fs32_to_cpu(sb, usb1->fs_inopb);
  	uspi->s_nspf = fs32_to_cpu(sb, usb1->fs_nspf);
  	uspi->s_npsect = ufs_get_fs_npsect(sb, usb1, usb3);
  	uspi->s_interleave = fs32_to_cpu(sb, usb1->fs_interleave);
  	uspi->s_trackskew = fs32_to_cpu(sb, usb1->fs_trackskew);

  
  	if (uspi->fs_magic == UFS2_MAGIC)
  		uspi->s_csaddr = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_csaddr);
  	else
  		uspi->s_csaddr = fs32_to_cpu(sb, usb1->fs_csaddr);

  	uspi->s_cssize = fs32_to_cpu(sb, usb1->fs_cssize);
  	uspi->s_cgsize = fs32_to_cpu(sb, usb1->fs_cgsize);
  	uspi->s_ntrak = fs32_to_cpu(sb, usb1->fs_ntrak);
  	uspi->s_nsect = fs32_to_cpu(sb, usb1->fs_nsect);
  	uspi->s_spc = fs32_to_cpu(sb, usb1->fs_spc);
  	uspi->s_ipg = fs32_to_cpu(sb, usb1->fs_ipg);
  	uspi->s_fpg = fs32_to_cpu(sb, usb1->fs_fpg);

  	uspi->s_cpc = fs32_to_cpu(sb, usb2->fs_un.fs_u1.fs_cpc);
  	uspi->s_contigsumsize = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_contigsumsize);

  	uspi->s_qbmask = ufs_get_fs_qbmask(sb, usb3);
  	uspi->s_qfmask = ufs_get_fs_qfmask(sb, usb3);

  	uspi->s_nrpos = fs32_to_cpu(sb, usb3->fs_nrpos);
  	uspi->s_postbloff = fs32_to_cpu(sb, usb3->fs_postbloff);
  	uspi->s_rotbloff = fs32_to_cpu(sb, usb3->fs_rotbloff);
  
  	/*
  	 * Compute another frequently used values
  	 */
  	uspi->s_fpbmask = uspi->s_fpb - 1;

  	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)

  		uspi->s_apbshift = uspi->s_bshift - 3;

  	else

  		uspi->s_apbshift = uspi->s_bshift - 2;

  	uspi->s_2apbshift = uspi->s_apbshift * 2;
  	uspi->s_3apbshift = uspi->s_apbshift * 3;
  	uspi->s_apb = 1 << uspi->s_apbshift;
  	uspi->s_2apb = 1 << uspi->s_2apbshift;
  	uspi->s_3apb = 1 << uspi->s_3apbshift;
  	uspi->s_apbmask = uspi->s_apb - 1;
  	uspi->s_nspfshift = uspi->s_fshift - UFS_SECTOR_BITS;
  	uspi->s_nspb = uspi->s_nspf << uspi->s_fpbshift;
  	uspi->s_inopf = uspi->s_inopb >> uspi->s_fpbshift;
  	uspi->s_bpf = uspi->s_fsize << 3;
  	uspi->s_bpfshift = uspi->s_fshift + 3;
  	uspi->s_bpfmask = uspi->s_bpf - 1;

  	if ((sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_44BSD ||
  	    (sbi->s_mount_opt & UFS_MOUNT_UFSTYPE) == UFS_MOUNT_UFSTYPE_UFS2)

  		uspi->s_maxsymlinklen =

  		    fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen);

  	if (uspi->fs_magic == UFS2_MAGIC)
  		maxsymlen = 2 * 4 * (UFS_NDADDR + UFS_NINDIR);
  	else
  		maxsymlen = 4 * (UFS_NDADDR + UFS_NINDIR);
  	if (uspi->s_maxsymlinklen > maxsymlen) {
  		ufs_warning(sb, __func__, "ufs_read_super: excessive maximum "
  			    "fast symlink size (%u)
  ", uspi->s_maxsymlinklen);
  		uspi->s_maxsymlinklen = maxsymlen;
  	}

  	sb->s_max_links = UFS_LINK_MAX;

  	inode = ufs_iget(sb, UFS_ROOTINO);
  	if (IS_ERR(inode)) {
  		ret = PTR_ERR(inode);

  		goto failed;

  	}

  	sb->s_root = d_make_root(inode);

  	if (!sb->s_root) {
  		ret = -ENOMEM;

  		goto failed;

  	}

  	ufs_setup_cstotal(sb);

  	/*
  	 * Read cylinder group structures
  	 */
  	if (!(sb->s_flags & MS_RDONLY))
  		if (!ufs_read_cylinder_structures(sb))
  			goto failed;

  	UFSD("EXIT
  ");

  	return 0;

  failed:

  	if (ubh)
  		ubh_brelse_uspi (uspi);
  	kfree (uspi);
  	kfree(sbi);

  	sb->s_fs_info = NULL;

  	UFSD("EXIT (FAILED)
  ");

  	return ret;

  
  failed_nomem:

  	UFSD("EXIT (NOMEM)
  ");

  	return -ENOMEM;
  }

  static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
  {
  	struct ufs_sb_private_info * uspi;
  	struct ufs_super_block_first * usb1;
  	struct ufs_super_block_third * usb3;
  	unsigned new_mount_opt, ufstype;
  	unsigned flags;

  	lock_ufs(sb);

  	mutex_lock(&UFS_SB(sb)->s_lock);

  	uspi = UFS_SB(sb)->s_uspi;
  	flags = UFS_SB(sb)->s_flags;

  	usb1 = ubh_get_usb_first(uspi);
  	usb3 = ubh_get_usb_third(uspi);

  	
  	/*
  	 * Allow the "check" option to be passed as a remount option.
  	 * It is not possible to change ufstype option during remount
  	 */
  	ufstype = UFS_SB(sb)->s_mount_opt & UFS_MOUNT_UFSTYPE;
  	new_mount_opt = 0;
  	ufs_set_opt (new_mount_opt, ONERROR_LOCK);

  	if (!ufs_parse_options (data, &new_mount_opt)) {

  		mutex_unlock(&UFS_SB(sb)->s_lock);

  		unlock_ufs(sb);

  		return -EINVAL;

  	}

  	if (!(new_mount_opt & UFS_MOUNT_UFSTYPE)) {
  		new_mount_opt |= ufstype;

  	} else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {

  		printk("ufstype can't be changed during remount
  ");

  		mutex_unlock(&UFS_SB(sb)->s_lock);

  		unlock_ufs(sb);

  		return -EINVAL;
  	}
  
  	if ((*mount_flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
  		UFS_SB(sb)->s_mount_opt = new_mount_opt;

  		mutex_unlock(&UFS_SB(sb)->s_lock);

  		unlock_ufs(sb);

  		return 0;
  	}
  	
  	/*
  	 * fs was mouted as rw, remounting ro
  	 */
  	if (*mount_flags & MS_RDONLY) {

  		ufs_put_super_internal(sb);

  		usb1->fs_time = cpu_to_fs32(sb, get_seconds());
  		if ((flags & UFS_ST_MASK) == UFS_ST_SUN

  		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS

  		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
  			ufs_set_fs_state(sb, usb1, usb3,
  				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));

  		ubh_mark_buffer_dirty (USPI_UBH(uspi));

  		sb->s_flags |= MS_RDONLY;

  	} else {

  	/*
  	 * fs was mounted as ro, remounting rw
  	 */

  #ifndef CONFIG_UFS_FS_WRITE
  		printk("ufs was compiled with read-only support, "
  		"can't be mounted as read-write
  ");

  		mutex_unlock(&UFS_SB(sb)->s_lock);

  		unlock_ufs(sb);

  		return -EINVAL;
  #else
  		if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 

  		    ufstype != UFS_MOUNT_UFSTYPE_SUNOS &&

  		    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&

  		    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
  		    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {

  			printk("this ufstype is read-only supported
  ");

  			mutex_unlock(&UFS_SB(sb)->s_lock);

  			unlock_ufs(sb);

  			return -EINVAL;
  		}

  		if (!ufs_read_cylinder_structures(sb)) {

  			printk("failed during remounting
  ");

  			mutex_unlock(&UFS_SB(sb)->s_lock);

  			unlock_ufs(sb);

  			return -EPERM;
  		}
  		sb->s_flags &= ~MS_RDONLY;
  #endif
  	}
  	UFS_SB(sb)->s_mount_opt = new_mount_opt;

  	mutex_unlock(&UFS_SB(sb)->s_lock);

  	unlock_ufs(sb);

  	return 0;
  }

  static int ufs_show_options(struct seq_file *seq, struct dentry *root)

  {

  	struct ufs_sb_info *sbi = UFS_SB(root->d_sb);

  	unsigned mval = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE;

  	const struct match_token *tp = tokens;

  
  	while (tp->token != Opt_onerror_panic && tp->token != mval)
  		++tp;
  	BUG_ON(tp->token == Opt_onerror_panic);
  	seq_printf(seq, ",%s", tp->pattern);
  
  	mval = sbi->s_mount_opt & UFS_MOUNT_ONERROR;
  	while (tp->token != Opt_err && tp->token != mval)
  		++tp;
  	BUG_ON(tp->token == Opt_err);
  	seq_printf(seq, ",%s", tp->pattern);
  
  	return 0;
  }

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

  {

  	struct super_block *sb = dentry->d_sb;

  	struct ufs_sb_private_info *uspi= UFS_SB(sb)->s_uspi;
  	unsigned  flags = UFS_SB(sb)->s_flags;
  	struct ufs_super_block_first *usb1;
  	struct ufs_super_block_second *usb2;
  	struct ufs_super_block_third *usb3;

  	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

  	lock_ufs(sb);

  	usb1 = ubh_get_usb_first(uspi);
  	usb2 = ubh_get_usb_second(uspi);
  	usb3 = ubh_get_usb_third(uspi);

  	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
  		buf->f_type = UFS2_MAGIC;

  		buf->f_blocks = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize);

  	} else {

  		buf->f_type = UFS_MAGIC;
  		buf->f_blocks = uspi->s_dsize;

  	}

  	buf->f_bfree = ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
  		uspi->cs_total.cs_nffree;
  	buf->f_ffree = uspi->cs_total.cs_nifree;

  	buf->f_bsize = sb->s_blocksize;
  	buf->f_bavail = (buf->f_bfree > (((long)buf->f_blocks / 100) * uspi->s_minfree))
  		? (buf->f_bfree - (((long)buf->f_blocks / 100) * uspi->s_minfree)) : 0;
  	buf->f_files = uspi->s_ncg * uspi->s_ipg;
  	buf->f_namelen = UFS_MAXNAMLEN;

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

  	unlock_ufs(sb);

  
  	return 0;
  }

  static struct kmem_cache * ufs_inode_cachep;

  
  static struct inode *ufs_alloc_inode(struct super_block *sb)
  {
  	struct ufs_inode_info *ei;

  	ei = (struct ufs_inode_info *)kmem_cache_alloc(ufs_inode_cachep, GFP_NOFS);

  	if (!ei)
  		return NULL;
  	ei->vfs_inode.i_version = 1;
  	return &ei->vfs_inode;
  }

  static void ufs_i_callback(struct rcu_head *head)

  {

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

  	kmem_cache_free(ufs_inode_cachep, UFS_I(inode));
  }

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

  static void init_once(void *foo)

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

  	inode_init_once(&ei->vfs_inode);

  }

  static int init_inodecache(void)
  {
  	ufs_inode_cachep = kmem_cache_create("ufs_inode_cache",
  					     sizeof(struct ufs_inode_info),

  					     0, (SLAB_RECLAIM_ACCOUNT|
  						SLAB_MEM_SPREAD),

  					     init_once);

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

  	/*
  	 * Make sure all delayed rcu free inodes are flushed before we
  	 * destroy cache.
  	 */
  	rcu_barrier();

  	kmem_cache_destroy(ufs_inode_cachep);

  }

  static const struct super_operations ufs_super_ops = {

  	.alloc_inode	= ufs_alloc_inode,
  	.destroy_inode	= ufs_destroy_inode,

  	.write_inode	= ufs_write_inode,

  	.evict_inode	= ufs_evict_inode,

  	.put_super	= ufs_put_super,

  	.sync_fs	= ufs_sync_fs,

  	.statfs		= ufs_statfs,
  	.remount_fs	= ufs_remount,

  	.show_options   = ufs_show_options,

  };

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

  {

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

  }
  
  static struct file_system_type ufs_fs_type = {
  	.owner		= THIS_MODULE,
  	.name		= "ufs",

  	.mount		= ufs_mount,

  	.kill_sb	= kill_block_super,
  	.fs_flags	= FS_REQUIRES_DEV,
  };

  MODULE_ALIAS_FS("ufs");

  
  static int __init init_ufs_fs(void)
  {
  	int err = init_inodecache();
  	if (err)
  		goto out1;
  	err = register_filesystem(&ufs_fs_type);
  	if (err)
  		goto out;
  	return 0;
  out:
  	destroy_inodecache();
  out1:
  	return err;
  }
  
  static void __exit exit_ufs_fs(void)
  {
  	unregister_filesystem(&ufs_fs_type);
  	destroy_inodecache();
  }
  
  module_init(init_ufs_fs)
  module_exit(exit_ufs_fs)
  MODULE_LICENSE("GPL");