/*
 *  linux/fs/affs/inode.c
 *
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
 *
 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
 *
 *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 */

#define DEBUG 0
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/malloc.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/affs_fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/amigaffs.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/uaccess.h>

extern int *blk_size[];
extern struct timezone sys_tz;

#define MIN(a,b) (((a)<(b))?(a):(b))

static int affs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz);
static int affs_remount (struct super_block *sb, int *flags, char *data);

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

	pr_debug("affs_put_super()\n");

	lock_super(sb);
	for (i = 0; i < sb->u.affs_sb.s_bm_count; i++)
		affs_brelse(sb->u.affs_sb.s_bitmap[i].bm_bh);
	if (!(sb->s_flags & MS_RDONLY)) {
		ROOT_END_S(sb->u.affs_sb.s_root_bh->b_data,sb)->bm_flag = be32_to_cpu(1);
		secs_to_datestamp(CURRENT_TIME,
				  &ROOT_END_S(sb->u.affs_sb.s_root_bh->b_data,sb)->disk_altered);
		affs_fix_checksum(sb->s_blocksize,sb->u.affs_sb.s_root_bh->b_data,5);
		mark_buffer_dirty(sb->u.affs_sb.s_root_bh,1);
	}

	if (sb->u.affs_sb.s_prefix)
		kfree(sb->u.affs_sb.s_prefix);
	kfree(sb->u.affs_sb.s_bitmap);
	affs_brelse(sb->u.affs_sb.s_root_bh);

	/* I'm not happy with this. It would be better to save the previous
	 * value of this devices blksize_size[][] in the super block and
	 * restore it here, but with the affs superblock being quite large
	 * already ...
	 */
	set_blocksize(sb->s_dev,BLOCK_SIZE);

	sb->s_dev = 0;
	unlock_super(sb);
	MOD_DEC_USE_COUNT;
	return;
}

static void
affs_write_super(struct super_block *sb)
{
	int	 i, clean = 2;

	if (!(sb->s_flags & MS_RDONLY)) {
		lock_super(sb);
		for (i = 0, clean = 1; i < sb->u.affs_sb.s_bm_count; i++) {
			if (sb->u.affs_sb.s_bitmap[i].bm_bh) {
				if (buffer_dirty(sb->u.affs_sb.s_bitmap[i].bm_bh)) {
					clean = 0;
					break;
				}
			}
		}
		unlock_super(sb);
		ROOT_END_S(sb->u.affs_sb.s_root_bh->b_data,sb)->bm_flag = be32_to_cpu(clean);
		secs_to_datestamp(CURRENT_TIME,
				  &ROOT_END_S(sb->u.affs_sb.s_root_bh->b_data,sb)->disk_altered);
		affs_fix_checksum(sb->s_blocksize,sb->u.affs_sb.s_root_bh->b_data,5);
		mark_buffer_dirty(sb->u.affs_sb.s_root_bh,1);
		sb->s_dirt = !clean;	/* redo until bitmap synced */
	} else
		sb->s_dirt = 0;

	pr_debug("AFFS: write_super() at %d, clean=%d\n",CURRENT_TIME,clean);
}

static struct super_operations affs_sops = {
	affs_read_inode,
	affs_write_inode,
	affs_put_inode,
	affs_delete_inode,
	affs_notify_change,
	affs_put_super,
	affs_write_super,
	affs_statfs,
	affs_remount
};

static int
parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
		int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
{
	char	*this_char, *value;
	int	 f;

	/* Fill in defaults */

	*uid        = current->uid;
	*gid        = current->gid;
	*reserved   = 2;
	*root       = -1;
	*blocksize  = -1;
	volume[0]   = ':';
	volume[1]   = 0;
	*mount_opts = 0;
	if (!options)
		return 1;
	for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
		f = 0;
		if ((value = strchr(this_char,'=')) != NULL)
			*value++ = 0;
		if (!strcmp(this_char,"protect")) {
			if (value) {
				printk("AFFS: Option protect does not take an argument\n");
				return 0;
			}
			*mount_opts |= SF_IMMUTABLE;
		} else if (!strcmp(this_char,"verbose")) {
			if (value) {
				printk("AFFS: Option verbose does not take an argument\n");
				return 0;
			}
			*mount_opts |= SF_VERBOSE;
		} else if ((f = !strcmp(this_char,"setuid")) || !strcmp(this_char,"setgid")) {
			if (value) {
				if (!*value) {
					printk("AFFS: Argument for set[ug]id option missing\n");
					return 0;
				} else {
					(f ? *uid : *gid) = simple_strtoul(value,&value,0);
					if (*value) {
						printk("AFFS: Bad set[ug]id argument\n");
						return 0;
					}
					*mount_opts |= f ? SF_SETUID : SF_SETGID;
				}
			}
		} else if (!strcmp(this_char,"prefix")) {
			if (!value || !*value) {
				printk("AFFS: The prefix option requires an argument\n");
				return 0;
			}
			if (*prefix)		/* Free any previous prefix */
				kfree(*prefix);
			*prefix = kmalloc(strlen(value) + 1,GFP_KERNEL);
			if (!*prefix)
				return 0;
			strcpy(*prefix,value);
			*mount_opts |= SF_PREFIX;
		} else if (!strcmp(this_char,"volume")) {
			if (!value || !*value) {
				printk("AFFS: The volume option requires an argument\n");
				return 0;
			}
			if (strlen(value) > 30)
				value[30] = 0;
			strncpy(volume,value,30);
		} else if (!strcmp(this_char,"mode")) {
			if (!value || !*value) {
				printk("AFFS: The mode option requires an argument\n");
				return 0;
			}
			*mode = simple_strtoul(value,&value,8) & 0777;
			if (*value)
				return 0;
			*mount_opts |= SF_SETMODE;
		} else if (!strcmp(this_char,"reserved")) {
			if (!value || !*value) {
				printk("AFFS: The reserved option requires an argument\n");
				return 0;
			}
			*reserved = simple_strtoul(value,&value,0);
			if (*value)
				return 0;
		} else if (!strcmp(this_char,"root")) {
			if (!value || !*value) {
				printk("AFFS: The root option requires an argument\n");
				return 0;
			}
			*root = simple_strtoul(value,&value,0);
			if (*value)
				return 0;
		} else if (!strcmp(this_char,"bs")) {
			if (!value || !*value) {
				printk("AFFS: The bs option requires an argument\n");
				return 0;
			}
			*blocksize = simple_strtoul(value,&value,0);
			if (*value)
				return 0;
			if (*blocksize != 512 && *blocksize != 1024 && *blocksize != 2048
			    && *blocksize != 4096) {
				printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
				return 0;
			}
		} else if (!strcmp (this_char, "grpquota")
			 || !strcmp (this_char, "noquota")
			 || !strcmp (this_char, "quota")
			 || !strcmp (this_char, "usrquota"))
			 /* Silently ignore the quota options */
			;
		else {
			printk("AFFS: Unrecognized mount option %s\n", this_char);
			return 0;
		}
	}
	return 1;
}

/* This function definitely needs to be split up. Some fine day I'll
 * hopefully have the guts to do so. Until then: sorry for the mess.
 */

static struct super_block *
affs_read_super(struct super_block *s,void *data, int silent)
{
	struct buffer_head	*bh = NULL;
	struct buffer_head	*bb;
	struct inode		*root_inode;
	kdev_t			 dev = s->s_dev;
	s32			 root_block;
	int			 size;
	u32			 chksum;
	u32			*bm;
	s32			 ptype, stype;
	int			 mapidx;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	int			 az_no;
	int			 bmalt = 0;
	unsigned long		 mount_flags;
	unsigned long		 offset;

	pr_debug("affs_read_super(%s)\n",data ? (const char *)data : "no options");

	MOD_INC_USE_COUNT;

	s->u.affs_sb.s_prefix = NULL;
	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	    &blocksize,&s->u.affs_sb.s_prefix,s->u.affs_sb.s_volume,&mount_flags)) {
		s->s_dev = 0;
		printk(KERN_ERR "AFFS: Error parsing options\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	lock_super(s);

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = blksize_size[MAJOR(dev)][MINOR(dev)];
	size = (size ? size : BLOCK_SIZE) / 512 * blk_size[MAJOR(dev)][MINOR(dev)];

	s->u.affs_sb.s_bitmap  = NULL;
	s->u.affs_sb.s_root_bh = NULL;
	s->u.affs_sb.s_flags   = mount_flags;
	s->u.affs_sb.s_mode    = i;
	s->u.affs_sb.s_uid     = uid;
	s->u.affs_sb.s_gid     = gid;

	if (size == 0) {
		s->s_dev = 0;
		unlock_super(s);
		printk(KERN_ERR "AFFS: Could not determine device size\n");
		goto out;
	}
	s->u.affs_sb.s_partition_size = size;
	s->u.affs_sb.s_reserved       = reserved;

	/* Try to find root block. Its location depends on the block size. */

	s->u.affs_sb.s_hashsize = 0;
	if (blocksize > 0) {
		i = blocksize;
		j = blocksize;
	} else {
		i = 512;
		j = 4096;
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		if (root_block < 0)
			s->u.affs_sb.s_root_block = (reserved + size - 1) / 2;
		else
			s->u.affs_sb.s_root_block = root_block;
		set_blocksize(dev,blocksize);

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s - trying bs=%d bytes, root at %u, "
				 "size=%d blocks, %d reserved\n",kdevname(dev),blocksize,
				 s->u.affs_sb.s_root_block + num_bm,size,reserved);
			bh = affs_bread(dev,s->u.affs_sb.s_root_block + num_bm,blocksize);
			if (!bh) {
				printk(KERN_ERR "AFFS: Cannot read root block\n");
				goto out;
			}
			if (!affs_checksum_block(blocksize,bh->b_data,&ptype,&stype) &&
			    ptype == T_SHORT && stype == ST_ROOT) {
				s->s_blocksize             = blocksize;
				s->u.affs_sb.s_hashsize    = blocksize / 4 - 56;
				s->u.affs_sb.s_root_block += num_bm;
				key                        = 1;
				break;
			}
		}
		if (key)
			break;
		affs_brelse(bh);
		bh = NULL;
	}
	if (!key) {
		affs_brelse(bh);
		if (!silent)
			printk(KERN_ERR "AFFS: Cannot find a valid root block on device %s\n",
				kdevname(dev));
		goto out;
	}
	root_block = s->u.affs_sb.s_root_block;

	s->u.affs_sb.s_partition_size   = size;
	s->s_blocksize_bits             = blocksize == 512 ? 9 :
					  blocksize == 1024 ? 10 :
					  blocksize == 2048 ? 11 : 12;

	/* Find out which kind of FS we have */
	bb = affs_bread(dev,0,s->s_blocksize);
	if (bb) {
		chksum = be32_to_cpu(*(u32 *)bb->b_data);

		/* Dircache filesystems are compatible with non-dircache ones
		 * when reading. As long as they aren't supported, writing is
		 * not recommended.
		 */
		if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
		     || chksum == MUFS_DCOFS) && !(s->s_flags & MS_RDONLY)) {
			printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
				kdevname(dev));
			s->s_flags |= MS_RDONLY;
			s->u.affs_sb.s_flags |= SF_READONLY;
		}
		switch (chksum) {
			case MUFS_FS:
			case MUFS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_INTL;
				break;
			case MUFS_DCFFS:
			case MUFS_FFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				break;
			case FS_DCFFS:
			case FS_FFS:
				break;
			case MUFS_OFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_OFS:
				s->u.affs_sb.s_flags |= SF_OFS;
				break;
			case MUFS_DCOFS:
			case MUFS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
			case FS_DCOFS:
			case FS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_INTL | SF_OFS;
				break;
			default:
				printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
					kdevname(dev),chksum);
				affs_brelse(bb);
				goto out;
		}
		affs_brelse(bb);
	} else {
		printk(KERN_ERR "AFFS: Cannot read boot block\n");
		goto out;
	}
	if (mount_flags & SF_VERBOSE) {
		chksum = cpu_to_be32(chksum);
		printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
			GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[0],
			&GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[1],
			(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}

	s->s_magic  = AFFS_SUPER_MAGIC;
	s->s_flags |= MS_NODEV | MS_NOSUID;

	/* Keep super block in cache */
	if (!(s->u.affs_sb.s_root_bh = affs_bread(dev,root_block,s->s_blocksize))) {
		printk(KERN_ERR "AFFS: Cannot read root block\n");
		goto out;
	}

	/* Allocate space for bitmaps, zones and others */

	size   = s->u.affs_sb.s_partition_size - reserved;
	num_bm = (size + s->s_blocksize * 8 - 32 - 1) / (s->s_blocksize * 8 - 32);
	az_no  = (size + AFFS_ZONE_SIZE - 1) / (AFFS_ZONE_SIZE - 32);
	ptype  = num_bm * sizeof(struct affs_bm_info) +
		 az_no * sizeof(struct affs_alloc_zone) +
		 MAX_ZONES * sizeof(struct affs_zone);
	pr_debug("num_bm=%d, az_no=%d, sum=%d\n",num_bm,az_no,ptype);
	if (!(s->u.affs_sb.s_bitmap = kmalloc(ptype,GFP_KERNEL))) {
		printk(KERN_ERR "AFFS: Not enough memory\n");
		goto out;
	}
	memset(s->u.affs_sb.s_bitmap,0,ptype);

	s->u.affs_sb.s_zones   = (struct affs_zone *)&s->u.affs_sb.s_bitmap[num_bm];
	s->u.affs_sb.s_alloc   = (struct affs_alloc_zone *)&s->u.affs_sb.s_zones[MAX_ZONES];
	s->u.affs_sb.s_num_az  = az_no;

	mapidx = 0;

	if (ROOT_END_S(bh->b_data,s)->bm_flag == 0) {
		if (!(s->s_flags & MS_RDONLY)) {
			printk(KERN_NOTICE "AFFS: Bitmap invalid - mounting %s read only\n",
				kdevname(dev));
			s->s_flags |= MS_RDONLY;
		}
		affs_brelse(bh);
		bh = NULL;
		goto nobitmap;
	}

	/* The following section is ugly, I know. Especially because of the
	 * reuse of some variables that are not named properly.
	 */

	key    = root_block;
	ptype  = s->s_blocksize / 4 - 49;
	stype  = ptype + 25;
	offset = s->u.affs_sb.s_reserved;
	az_no  = 0;
	while (bh) {
		bm = (u32 *)bh->b_data;
		for (i = ptype; i < stype && bm[i]; i++, mapidx++) {
			if (mapidx >= num_bm) {
				printk(KERN_ERR "AFFS: Extraneous bitmap pointer - "
					       "mounting %s read only.\n",kdevname(dev));
				s->s_flags |= MS_RDONLY;
				s->u.affs_sb.s_flags |= SF_READONLY;
				continue;
			}
			bb = affs_bread(s->s_dev,be32_to_cpu(bm[i]),s->s_blocksize);
			if (bb) {
				if (affs_checksum_block(s->s_blocksize,bb->b_data,NULL,NULL) &&
				    !(s->s_flags & MS_RDONLY)) {
					printk(KERN_WARNING "AFFS: Bitmap (%d,key=%lu) invalid - "
					       "mounting %s read only.\n",mapidx,be32_to_cpu(bm[i]),
						kdevname(dev));
					s->s_flags |= MS_RDONLY;
					s->u.affs_sb.s_flags |= SF_READONLY;
				}
				/* Mark unused bits in the last word as allocated */
				if (size <= s->s_blocksize * 8 - 32) {	/* last bitmap */
					ptype = size / 32 + 1;		/* word number */
					key   = size & 0x1F;		/* used bits */
					if (key && !(s->s_flags & MS_RDONLY)) {
						chksum = cpu_to_be32(0x7FFFFFFF >> (31 - key));
						((u32 *)bb->b_data)[ptype] &= chksum;
						affs_fix_checksum(s->s_blocksize,bb->b_data,0);
						mark_buffer_dirty(bb,1);
						bmalt = 1;
					}
					ptype = (size + 31) & ~0x1F;
					size  = 0;
					s->u.affs_sb.s_flags |= SF_BM_VALID;
				} else {
					ptype = s->s_blocksize * 8 - 32;
					size -= ptype;
				}
				s->u.affs_sb.s_bitmap[mapidx].bm_firstblk = offset;
				s->u.affs_sb.s_bitmap[mapidx].bm_bh       = NULL;
				s->u.affs_sb.s_bitmap[mapidx].bm_key      = be32_to_cpu(bm[i]);
				s->u.affs_sb.s_bitmap[mapidx].bm_count    = 0;
				offset += ptype;

				for (j = 0; ptype > 0; j++, az_no++, ptype -= key) {
					key = MIN(ptype,AFFS_ZONE_SIZE);	/* size in bits */
					s->u.affs_sb.s_alloc[az_no].az_size = key / 32;
					s->u.affs_sb.s_alloc[az_no].az_free =
						affs_count_free_bits(key / 8,bb->b_data +
								     j * (AFFS_ZONE_SIZE / 8) + 4);
				}
				affs_brelse(bb);
			} else {
				printk(KERN_ERR "AFFS: Cannot read bitmap\n");
				goto out;
			}
		}
		key   = be32_to_cpu(bm[stype]);		/* Next block of bitmap pointers	*/
		ptype = 0;
		stype = s->s_blocksize / 4 - 1;
		affs_brelse(bh);
		if (key) {
			if (!(bh = affs_bread(s->s_dev,key,s->s_blocksize))) {
				printk(KERN_ERR "AFFS: Cannot read bitmap extension\n");
				goto out;
			}
		} else
			bh = NULL;
	}
	if (mapidx < num_bm) {
		printk(KERN_ERR "AFFS: Got only %d bitmap blocks, expected %d\n",mapidx,num_bm);
		goto out;
	}
nobitmap:
	s->u.affs_sb.s_bm_count = num_bm;

	/* set up enough so that it can read an inode */

	s->s_dev   = dev;
	s->s_op    = &affs_sops;
	s->s_dirt  = 1;
	root_inode = iget(s,root_block);
	s->s_root  = d_alloc_root(root_inode,NULL);
	unlock_super(s);

	if (!(s->s_root)) {
		s->s_dev = 0;
		affs_brelse(s->u.affs_sb.s_root_bh);
		printk(KERN_ERR "AFFS: get root inode failed\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}

	/* Record date of last change if the bitmap was truncated and
	 * create data zones if the volume is writable.
	 */

	if (!(s->s_flags & MS_RDONLY)) {
		if (bmalt) {
			secs_to_datestamp(CURRENT_TIME,&ROOT_END(
				s->u.affs_sb.s_root_bh->b_data,root_inode)->disk_altered);
			affs_fix_checksum(s->s_blocksize,s->u.affs_sb.s_root_bh->b_data,5);
			mark_buffer_dirty(s->u.affs_sb.s_root_bh,1);
		}
		affs_make_zones(s);
	}

	pr_debug("AFFS: s_flags=%lX\n",s->s_flags);
	return s;

 out: /* Kick out for various error conditions */
	affs_brelse (bh);
	affs_brelse(s->u.affs_sb.s_root_bh);
	if (s->u.affs_sb.s_bitmap)
		kfree(s->u.affs_sb.s_bitmap);
	set_blocksize(dev,BLOCK_SIZE);
	s->s_dev = 0;
	unlock_super(s);
	MOD_DEC_USE_COUNT;
	return NULL;
}

static int
affs_remount(struct super_block *sb, int *flags, char *data)
{
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 mode;
	int			 reserved;
	int			 root_block;
	unsigned long		 mount_flags;
	unsigned long		 read_only = sb->u.affs_sb.s_flags & SF_READONLY;

	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);

	if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
	    &blocksize,&sb->u.affs_sb.s_prefix,sb->u.affs_sb.s_volume,&mount_flags))
		return -EINVAL;
	sb->u.affs_sb.s_flags = mount_flags | read_only;
	sb->u.affs_sb.s_mode  = mode;
	sb->u.affs_sb.s_uid   = uid;
	sb->u.affs_sb.s_gid   = gid;

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;
	if (*flags & MS_RDONLY) {
		sb->s_dirt = 1;
		while (sb->s_dirt)
			affs_write_super(sb);
		sb->s_flags |= MS_RDONLY;
	} else if (!(sb->u.affs_sb.s_flags & SF_READONLY)) {
		sb->s_flags &= ~MS_RDONLY;
		affs_make_zones(sb);
	} else {
		affs_warning(sb,"remount","Cannot remount fs read/write because of errors");
		return -EINVAL;
	}
	return 0;
}

static int
affs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
{
	int		 free;
	struct statfs	 tmp;

	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",sb->u.affs_sb.s_partition_size,
	     sb->u.affs_sb.s_reserved);

	free          = affs_count_free_blocks(sb);
	tmp.f_type    = AFFS_SUPER_MAGIC;
	tmp.f_bsize   = sb->s_blocksize;
	tmp.f_blocks  = sb->u.affs_sb.s_partition_size - sb->u.affs_sb.s_reserved;
	tmp.f_bfree   = free;
	tmp.f_bavail  = free;
	tmp.f_files   = 0;
	tmp.f_ffree   = 0;
	return copy_to_user(buf,&tmp,bufsiz) ? -EFAULT : 0;
}

static struct file_system_type affs_fs_type = {
	"affs",
	FS_REQUIRES_DEV,
	affs_read_super,
	NULL
};

__initfunc(int init_affs_fs(void))
{
	return register_filesystem(&affs_fs_type);
}

#ifdef MODULE
EXPORT_NO_SYMBOLS;

int
init_module(void)
{
	return register_filesystem(&affs_fs_type);
}

void
cleanup_module(void)
{
	unregister_filesystem(&affs_fs_type);
}

#endif