[mirror_ubuntu-hirsute-kernel.git] / fs / adfs / super.c

/*
 *  linux/fs/adfs/super.c
 *
 *  Copyright (C) 1997-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/adfs_fs.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/parser.h>
#include <linux/bitops.h>
#include <linux/mount.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>
#include <asm/system.h>

#include <stdarg.h>

#include "adfs.h"
#include "dir_f.h"
#include "dir_fplus.h"

#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)

void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
{
	char error_buf[128];
	va_list args;

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

	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
		sb->s_id, function ? ": " : "",
		function ? function : "", error_buf);
}

static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
{
	int i;

	/* sector size must be 256, 512 or 1024 bytes */
	if (dr->log2secsize != 8 &&
	    dr->log2secsize != 9 &&
	    dr->log2secsize != 10)
		return 1;

	/* idlen must be at least log2secsize + 3 */
	if (dr->idlen < dr->log2secsize + 3)
		return 1;

	/* we cannot have such a large disc that we
	 * are unable to represent sector offsets in
	 * 32 bits.  This works out at 2.0 TB.
	 */
	if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
		return 1;

	/* idlen must be no greater than 19 v2 [1.0] */
	if (dr->idlen > 19)
		return 1;

	/* reserved bytes should be zero */
	for (i = 0; i < sizeof(dr->unused52); i++)
		if (dr->unused52[i] != 0)
			return 1;

	return 0;
}

static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
{
	unsigned int v0, v1, v2, v3;
	int i;

	v0 = v1 = v2 = v3 = 0;
	for (i = sb->s_blocksize - 4; i; i -= 4) {
		v0 += map[i]     + (v3 >> 8);
		v3 &= 0xff;
		v1 += map[i + 1] + (v0 >> 8);
		v0 &= 0xff;
		v2 += map[i + 2] + (v1 >> 8);
		v1 &= 0xff;
		v3 += map[i + 3] + (v2 >> 8);
		v2 &= 0xff;
	}
	v0 +=           v3 >> 8;
	v1 += map[1] + (v0 >> 8);
	v2 += map[2] + (v1 >> 8);
	v3 += map[3] + (v2 >> 8);

	return v0 ^ v1 ^ v2 ^ v3;
}

static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
{
	unsigned char crosscheck = 0, zonecheck = 1;
	int i;

	for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
		unsigned char *map;

		map = dm[i].dm_bh->b_data;

		if (adfs_calczonecheck(sb, map) != map[0]) {
			adfs_error(sb, "zone %d fails zonecheck", i);
			zonecheck = 0;
		}
		crosscheck ^= map[3];
	}
	if (crosscheck != 0xff)
		adfs_error(sb, "crosscheck != 0xff");
	return crosscheck == 0xff && zonecheck;
}

static void adfs_put_super(struct super_block *sb)
{
	int i;
	struct adfs_sb_info *asb = ADFS_SB(sb);

	lock_kernel();

	for (i = 0; i < asb->s_map_size; i++)
		brelse(asb->s_map[i].dm_bh);
	kfree(asb->s_map);
	kfree(asb);
	sb->s_fs_info = NULL;

	unlock_kernel();
}

static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
	struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);

	if (asb->s_uid != 0)
		seq_printf(seq, ",uid=%u", asb->s_uid);
	if (asb->s_gid != 0)
		seq_printf(seq, ",gid=%u", asb->s_gid);
	if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
		seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
	if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
		seq_printf(seq, ",othmask=%o", asb->s_other_mask);

	return 0;
}

enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};

static const match_table_t tokens = {
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_ownmask, "ownmask=%o"},
	{Opt_othmask, "othmask=%o"},
	{Opt_err, NULL}
};

static int parse_options(struct super_block *sb, char *options)
{
	char *p;
	struct adfs_sb_info *asb = ADFS_SB(sb);
	int option;

	if (!options)
		return 0;

	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_uid:
			if (match_int(args, &option))
				return -EINVAL;
			asb->s_uid = option;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return -EINVAL;
			asb->s_gid = option;
			break;
		case Opt_ownmask:
			if (match_octal(args, &option))
				return -EINVAL;
			asb->s_owner_mask = option;
			break;
		case Opt_othmask:
			if (match_octal(args, &option))
				return -EINVAL;
			asb->s_other_mask = option;
			break;
		default:
			printk("ADFS-fs: unrecognised mount option \"%s\" "
					"or missing value\n", p);
			return -EINVAL;
		}
	}
	return 0;
}

static int adfs_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NODIRATIME;
	return parse_options(sb, data);
}

static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct adfs_sb_info *sbi = ADFS_SB(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type    = ADFS_SUPER_MAGIC;
	buf->f_namelen = sbi->s_namelen;
	buf->f_bsize   = sb->s_blocksize;
	buf->f_blocks  = sbi->s_size;
	buf->f_files   = sbi->s_ids_per_zone * sbi->s_map_size;
	buf->f_bavail  =
	buf->f_bfree   = adfs_map_free(sb);
	buf->f_ffree   = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);

	return 0;
}

static struct kmem_cache *adfs_inode_cachep;

static struct inode *adfs_alloc_inode(struct super_block *sb)
{
	struct adfs_inode_info *ei;
	ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void adfs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
}

static void init_once(void *foo)
{
	struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;

	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
					     sizeof(struct adfs_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once);
	if (adfs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(adfs_inode_cachep);
}

static const struct super_operations adfs_sops = {
	.alloc_inode	= adfs_alloc_inode,
	.destroy_inode	= adfs_destroy_inode,
	.write_inode	= adfs_write_inode,
	.put_super	= adfs_put_super,
	.statfs		= adfs_statfs,
	.remount_fs	= adfs_remount,
	.show_options	= adfs_show_options,
};

static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
{
	struct adfs_discmap *dm;
	unsigned int map_addr, zone_size, nzones;
	int i, zone;
	struct adfs_sb_info *asb = ADFS_SB(sb);

	nzones    = asb->s_map_size;
	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
	map_addr  = (nzones >> 1) * zone_size -
		     ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
	map_addr  = signed_asl(map_addr, asb->s_map2blk);

	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);

	dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
	if (dm == NULL) {
		adfs_error(sb, "not enough memory");
		return NULL;
	}

	for (zone = 0; zone < nzones; zone++, map_addr++) {
		dm[zone].dm_startbit = 0;
		dm[zone].dm_endbit   = zone_size;
		dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
		dm[zone].dm_bh       = sb_bread(sb, map_addr);

		if (!dm[zone].dm_bh) {
			adfs_error(sb, "unable to read map");
			goto error_free;
		}
	}

	/* adjust the limits for the first and last map zones */
	i = zone - 1;
	dm[0].dm_startblk = 0;
	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
	dm[i].dm_endbit   = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
			    (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
			    (ADFS_DR_SIZE_BITS - i * zone_size);

	if (adfs_checkmap(sb, dm))
		return dm;

	adfs_error(sb, "map corrupted");

error_free:
	while (--zone >= 0)
		brelse(dm[zone].dm_bh);

	kfree(dm);
	return NULL;
}

static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
{
	unsigned long discsize;

	discsize  = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
	discsize |= le32_to_cpu(dr->disc_size) >> block_bits;

	return discsize;
}

static int adfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct adfs_discrecord *dr;
	struct buffer_head *bh;
	struct object_info root_obj;
	unsigned char *b_data;
	struct adfs_sb_info *asb;
	struct inode *root;

	sb->s_flags |= MS_NODIRATIME;

	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
	if (!asb)
		return -ENOMEM;
	sb->s_fs_info = asb;

	/* set default options */
	asb->s_uid = 0;
	asb->s_gid = 0;
	asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
	asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;

	if (parse_options(sb, data))
		goto error;

	sb_set_blocksize(sb, BLOCK_SIZE);
	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
		adfs_error(sb, "unable to read superblock");
		goto error;
	}

	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);

	if (adfs_checkbblk(b_data)) {
		if (!silent)
			printk("VFS: Can't find an adfs filesystem on dev "
				"%s.\n", sb->s_id);
		goto error_free_bh;
	}

	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);

	/*
	 * Do some sanity checks on the ADFS disc record
	 */
	if (adfs_checkdiscrecord(dr)) {
		if (!silent)
			printk("VPS: Can't find an adfs filesystem on dev "
				"%s.\n", sb->s_id);
		goto error_free_bh;
	}

	brelse(bh);
	if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
		bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
		if (!bh) {
			adfs_error(sb, "couldn't read superblock on "
				"2nd try.");
			goto error;
		}
		b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
		if (adfs_checkbblk(b_data)) {
			adfs_error(sb, "disc record mismatch, very weird!");
			goto error_free_bh;
		}
		dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	} else {
		if (!silent)
			printk(KERN_ERR "VFS: Unsupported blocksize on dev "
				"%s.\n", sb->s_id);
		goto error;
	}

	/*
	 * blocksize on this device should now be set to the ADFS log2secsize
	 */

	sb->s_magic		= ADFS_SUPER_MAGIC;
	asb->s_idlen		= dr->idlen;
	asb->s_map_size		= dr->nzones | (dr->nzones_high << 8);
	asb->s_map2blk		= dr->log2bpmb - dr->log2secsize;
	asb->s_size    		= adfs_discsize(dr, sb->s_blocksize_bits);
	asb->s_version 		= dr->format_version;
	asb->s_log2sharesize	= dr->log2sharesize;
	
	asb->s_map = adfs_read_map(sb, dr);
	if (!asb->s_map)
		goto error_free_bh;

	brelse(bh);

	/*
	 * set up enough so that we can read an inode
	 */
	sb->s_op = &adfs_sops;

	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);

	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
	root_obj.name_len  = 0;
	root_obj.loadaddr  = 0;
	root_obj.execaddr  = 0;
	root_obj.size	   = ADFS_NEWDIR_SIZE;
	root_obj.attr	   = ADFS_NDA_DIRECTORY   | ADFS_NDA_OWNER_READ |
			     ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;

	/*
	 * If this is a F+ disk with variable length directories,
	 * get the root_size from the disc record.
	 */
	if (asb->s_version) {
		root_obj.size = le32_to_cpu(dr->root_size);
		asb->s_dir     = &adfs_fplus_dir_ops;
		asb->s_namelen = ADFS_FPLUS_NAME_LEN;
	} else {
		asb->s_dir     = &adfs_f_dir_ops;
		asb->s_namelen = ADFS_F_NAME_LEN;
	}

	root = adfs_iget(sb, &root_obj);
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		int i;
		iput(root);
		for (i = 0; i < asb->s_map_size; i++)
			brelse(asb->s_map[i].dm_bh);
		kfree(asb->s_map);
		adfs_error(sb, "get root inode failed\n");
		goto error;
	} else
		sb->s_root->d_op = &adfs_dentry_operations;
	return 0;

error_free_bh:
	brelse(bh);
error:
	sb->s_fs_info = NULL;
	kfree(asb);
	return -EINVAL;
}

static int adfs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super,
			   mnt);
}

static struct file_system_type adfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "adfs",
	.get_sb		= adfs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_adfs_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&adfs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_adfs_fs(void)
{
	unregister_filesystem(&adfs_fs_type);
	destroy_inodecache();
}

module_init(init_adfs_fs)
module_exit(exit_adfs_fs)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/adfs/super.c
	3	*
	4	* Copyright (C) 1997-1999 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/errno.h>
	12	#include <linux/fs.h>
	13	#include <linux/adfs_fs.h>
	14	#include <linux/slab.h>
	15	#include <linux/time.h>
	16	#include <linux/stat.h>
	17	#include <linux/string.h>
	18	#include <linux/init.h>
	19	#include <linux/buffer_head.h>
	20	#include <linux/vfs.h>
	21	#include <linux/parser.h>
	22	#include <linux/bitops.h>
e11400b0 MS	23	#include <linux/mount.h>
e11400b0 MS	24	#include <linux/seq_file.h>
1da177e4 LT	25
	26	#include <asm/uaccess.h>
	27	#include <asm/system.h>
	28
	29	#include <stdarg.h>
	30
	31	#include "adfs.h"
	32	#include "dir_f.h"
	33	#include "dir_fplus.h"
	34
e11400b0 MS	35	#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
	36	#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG \| S_IRWXO)
	37
1da177e4 LT	38	void __adfs_error(struct super_block sb, const char function, const char *fmt, ...)
	39	{
	40	char error_buf[128];
	41	va_list args;
	42
	43	va_start(args, fmt);
4a6e617a	44	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 LT	45	va_end(args);
	46
	47	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
	48	sb->s_id, function ? ": " : "",
	49	function ? function : "", error_buf);
	50	}
	51
	52	static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
	53	{
	54	int i;
	55
	56	/* sector size must be 256, 512 or 1024 bytes */
	57	if (dr->log2secsize != 8 &&
	58	dr->log2secsize != 9 &&
	59	dr->log2secsize != 10)
	60	return 1;
	61
	62	/* idlen must be at least log2secsize + 3 */
	63	if (dr->idlen < dr->log2secsize + 3)
	64	return 1;
	65
	66	/* we cannot have such a large disc that we
	67	* are unable to represent sector offsets in
	68	* 32 bits. This works out at 2.0 TB.
	69	*/
	70	if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
	71	return 1;
	72
	73	/* idlen must be no greater than 19 v2 [1.0] */
	74	if (dr->idlen > 19)
	75	return 1;
	76
	77	/* reserved bytes should be zero */
	78	for (i = 0; i < sizeof(dr->unused52); i++)
	79	if (dr->unused52[i] != 0)
	80	return 1;
	81
	82	return 0;
	83	}
	84
	85	static unsigned char adfs_calczonecheck(struct super_block sb, unsigned char map)
	86	{
	87	unsigned int v0, v1, v2, v3;
	88	int i;
	89
	90	v0 = v1 = v2 = v3 = 0;
	91	for (i = sb->s_blocksize - 4; i; i -= 4) {
	92	v0 += map[i] + (v3 >> 8);
	93	v3 &= 0xff;
	94	v1 += map[i + 1] + (v0 >> 8);
	95	v0 &= 0xff;
	96	v2 += map[i + 2] + (v1 >> 8);
	97	v1 &= 0xff;
	98	v3 += map[i + 3] + (v2 >> 8);
	99	v2 &= 0xff;
	100	}
	101	v0 += v3 >> 8;
	102	v1 += map[1] + (v0 >> 8);
	103	v2 += map[2] + (v1 >> 8);
	104	v3 += map[3] + (v2 >> 8);
	105
	106	return v0 ^ v1 ^ v2 ^ v3;
	107	}
	108
109	static int adfs_checkmap(struct super_block sb, struct adfs_discmap dm)
110	{
111	unsigned char crosscheck = 0, zonecheck = 1;
112	int i;
113
114	for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
115	unsigned char *map;
116
117	map = dm[i].dm_bh->b_data;
118
119	if (adfs_calczonecheck(sb, map) != map[0]) {
120	adfs_error(sb, "zone %d fails zonecheck", i);
121	zonecheck = 0;
122	}
123	crosscheck ^= map[3];
124	}
125	if (crosscheck != 0xff)
126	adfs_error(sb, "crosscheck != 0xff");
127	return crosscheck == 0xff && zonecheck;
128	}
129
130	static void adfs_put_super(struct super_block *sb)
131	{
132	int i;
133	struct adfs_sb_info *asb = ADFS_SB(sb);
134
6cfd0148 CH	135	lock_kernel();
6cfd0148 CH	136
1da177e4 LT	137	for (i = 0; i < asb->s_map_size; i++)
	138	brelse(asb->s_map[i].dm_bh);
	139	kfree(asb->s_map);
	140	kfree(asb);
	141	sb->s_fs_info = NULL;
6cfd0148 CH	142
6cfd0148 CH	143	unlock_kernel();
1da177e4 LT	144	}
1da177e4 LT	145
e11400b0 MS	146	static int adfs_show_options(struct seq_file seq, struct vfsmount mnt)
	147	{
	148	struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);
	149
	150	if (asb->s_uid != 0)
	151	seq_printf(seq, ",uid=%u", asb->s_uid);
	152	if (asb->s_gid != 0)
	153	seq_printf(seq, ",gid=%u", asb->s_gid);
	154	if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
	155	seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
	156	if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
	157	seq_printf(seq, ",othmask=%o", asb->s_other_mask);
	158
	159	return 0;
	160	}
	161
1da177e4 LT	162	enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
1da177e4 LT	163
a447c093	164	static const match_table_t tokens = {
1da177e4 LT	165	{Opt_uid, "uid=%u"},
	166	{Opt_gid, "gid=%u"},
	167	{Opt_ownmask, "ownmask=%o"},
	168	{Opt_othmask, "othmask=%o"},
	169	{Opt_err, NULL}
	170	};
	171
	172	static int parse_options(struct super_block sb, char options)
	173	{
	174	char *p;
	175	struct adfs_sb_info *asb = ADFS_SB(sb);
	176	int option;
	177
	178	if (!options)
	179	return 0;
	180
	181	while ((p = strsep(&options, ",")) != NULL) {
	182	substring_t args[MAX_OPT_ARGS];
	183	int token;
	184	if (!*p)
	185	continue;
	186
	187	token = match_token(p, tokens, args);
	188	switch (token) {
	189	case Opt_uid:
	190	if (match_int(args, &option))
	191	return -EINVAL;
	192	asb->s_uid = option;
	193	break;
	194	case Opt_gid:
	195	if (match_int(args, &option))
	196	return -EINVAL;
	197	asb->s_gid = option;
	198	break;
	199	case Opt_ownmask:
	200	if (match_octal(args, &option))
	201	return -EINVAL;
	202	asb->s_owner_mask = option;
	203	break;
	204	case Opt_othmask:
	205	if (match_octal(args, &option))
	206	return -EINVAL;
	207	asb->s_other_mask = option;
	208	break;
	209	default:
	210	printk("ADFS-fs: unrecognised mount option \"%s\" "
	211	"or missing value\n", p);
	212	return -EINVAL;
	213	}
	214	}
	215	return 0;
	216	}
	217
	218	static int adfs_remount(struct super_block sb, int flags, char *data)
	219	{
	220	*flags \|= MS_NODIRATIME;
	221	return parse_options(sb, data);
	222	}
	223
726c3342	224	static int adfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	225	{
accb4012 CL	226	struct super_block *sb = dentry->d_sb;
	227	struct adfs_sb_info *sbi = ADFS_SB(sb);
	228	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	229
1da177e4 LT	230	buf->f_type = ADFS_SUPER_MAGIC;
accb4012 CL	231	buf->f_namelen = sbi->s_namelen;
	232	buf->f_bsize = sb->s_blocksize;
	233	buf->f_blocks = sbi->s_size;
	234	buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
1da177e4	235	buf->f_bavail =
accb4012	236	buf->f_bfree = adfs_map_free(sb);
1da177e4	237	buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
accb4012 CL	238	buf->f_fsid.val[0] = (u32)id;
accb4012 CL	239	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	240
	241	return 0;
	242	}
	243
e18b890b	244	static struct kmem_cache *adfs_inode_cachep;
1da177e4 LT	245
	246	static struct inode adfs_alloc_inode(struct super_block sb)
	247	{
	248	struct adfs_inode_info *ei;
e94b1766	249	ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	250	if (!ei)
	251	return NULL;
	252	return &ei->vfs_inode;
	253	}
	254
	255	static void adfs_destroy_inode(struct inode *inode)
	256	{
	257	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
	258	}
	259
51cc5068	260	static void init_once(void *foo)
1da177e4 LT	261	{
	262	struct adfs_inode_info ei = (struct adfs_inode_info ) foo;
	263
a35afb83	264	inode_init_once(&ei->vfs_inode);
1da177e4	265	}
20c2df83	266
1da177e4 LT	267	static int init_inodecache(void)
	268	{
	269	adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
	270	sizeof(struct adfs_inode_info),
fffb60f9 PJ	271	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	272	SLAB_MEM_SPREAD),
20c2df83	273	init_once);
1da177e4 LT	274	if (adfs_inode_cachep == NULL)
	275	return -ENOMEM;
	276	return 0;
	277	}
	278
	279	static void destroy_inodecache(void)
	280	{
1a1d92c1	281	kmem_cache_destroy(adfs_inode_cachep);
1da177e4 LT	282	}
1da177e4 LT	283
ee9b6d61	284	static const struct super_operations adfs_sops = {
1da177e4 LT	285	.alloc_inode = adfs_alloc_inode,
	286	.destroy_inode = adfs_destroy_inode,
	287	.write_inode = adfs_write_inode,
	288	.put_super = adfs_put_super,
	289	.statfs = adfs_statfs,
	290	.remount_fs = adfs_remount,
e11400b0	291	.show_options = adfs_show_options,
1da177e4 LT	292	};
	293
	294	static struct adfs_discmap adfs_read_map(struct super_block sb, struct adfs_discrecord *dr)
	295	{
	296	struct adfs_discmap *dm;
	297	unsigned int map_addr, zone_size, nzones;
	298	int i, zone;
	299	struct adfs_sb_info *asb = ADFS_SB(sb);
	300
	301	nzones = asb->s_map_size;
	302	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
	303	map_addr = (nzones >> 1) * zone_size -
	304	((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
	305	map_addr = signed_asl(map_addr, asb->s_map2blk);
	306
	307	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
	308
	309	dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
	310	if (dm == NULL) {
	311	adfs_error(sb, "not enough memory");
	312	return NULL;
	313	}
	314
	315	for (zone = 0; zone < nzones; zone++, map_addr++) {
	316	dm[zone].dm_startbit = 0;
	317	dm[zone].dm_endbit = zone_size;
	318	dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
	319	dm[zone].dm_bh = sb_bread(sb, map_addr);
	320
	321	if (!dm[zone].dm_bh) {
	322	adfs_error(sb, "unable to read map");
	323	goto error_free;
	324	}
	325	}
	326
	327	/* adjust the limits for the first and last map zones */
	328	i = zone - 1;
	329	dm[0].dm_startblk = 0;
	330	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
	331	dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
	332	(le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
	333	(ADFS_DR_SIZE_BITS - i * zone_size);
	334
	335	if (adfs_checkmap(sb, dm))
	336	return dm;
	337
1725cd0a	338	adfs_error(sb, "map corrupted");
1da177e4 LT	339
	340	error_free:
	341	while (--zone >= 0)
	342	brelse(dm[zone].dm_bh);
	343
	344	kfree(dm);
	345	return NULL;
	346	}
	347
	348	static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
	349	{
	350	unsigned long discsize;
	351
	352	discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
	353	discsize \|= le32_to_cpu(dr->disc_size) >> block_bits;
	354
	355	return discsize;
	356	}
	357
	358	static int adfs_fill_super(struct super_block sb, void data, int silent)
	359	{
	360	struct adfs_discrecord *dr;
	361	struct buffer_head *bh;
	362	struct object_info root_obj;
	363	unsigned char *b_data;
	364	struct adfs_sb_info *asb;
	365	struct inode *root;
	366
	367	sb->s_flags \|= MS_NODIRATIME;
	368
f8314dc6	369	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
1da177e4 LT	370	if (!asb)
	371	return -ENOMEM;
	372	sb->s_fs_info = asb;
1da177e4 LT	373
	374	/* set default options */
	375	asb->s_uid = 0;
	376	asb->s_gid = 0;
e11400b0 MS	377	asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
e11400b0 MS	378	asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
1da177e4 LT	379
	380	if (parse_options(sb, data))
	381	goto error;
	382
	383	sb_set_blocksize(sb, BLOCK_SIZE);
	384	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
	385	adfs_error(sb, "unable to read superblock");
	386	goto error;
	387	}
	388
	389	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
	390
	391	if (adfs_checkbblk(b_data)) {
	392	if (!silent)
	393	printk("VFS: Can't find an adfs filesystem on dev "
	394	"%s.\n", sb->s_id);
	395	goto error_free_bh;
	396	}
	397
	398	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	399
	400	/*
	401	* Do some sanity checks on the ADFS disc record
	402	*/
	403	if (adfs_checkdiscrecord(dr)) {
	404	if (!silent)
	405	printk("VPS: Can't find an adfs filesystem on dev "
	406	"%s.\n", sb->s_id);
	407	goto error_free_bh;
	408	}
	409
	410	brelse(bh);
	411	if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
	412	bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
	413	if (!bh) {
	414	adfs_error(sb, "couldn't read superblock on "
	415	"2nd try.");
	416	goto error;
	417	}
	418	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
	419	if (adfs_checkbblk(b_data)) {
	420	adfs_error(sb, "disc record mismatch, very weird!");
	421	goto error_free_bh;
	422	}
	423	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	424	} else {
	425	if (!silent)
	426	printk(KERN_ERR "VFS: Unsupported blocksize on dev "
	427	"%s.\n", sb->s_id);
	428	goto error;
	429	}
	430
	431	/*
	432	* blocksize on this device should now be set to the ADFS log2secsize
	433	*/
	434
	435	sb->s_magic = ADFS_SUPER_MAGIC;
	436	asb->s_idlen = dr->idlen;
	437	asb->s_map_size = dr->nzones \| (dr->nzones_high << 8);
	438	asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
	439	asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
	440	asb->s_version = dr->format_version;
	441	asb->s_log2sharesize = dr->log2sharesize;
	442
443	asb->s_map = adfs_read_map(sb, dr);
444	if (!asb->s_map)
445	goto error_free_bh;
446
447	brelse(bh);
448
449	/*
450	* set up enough so that we can read an inode
451	*/
452	sb->s_op = &adfs_sops;
453
454	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
455
456	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
457	root_obj.name_len = 0;
458	root_obj.loadaddr = 0;
459	root_obj.execaddr = 0;
460	root_obj.size = ADFS_NEWDIR_SIZE;
461	root_obj.attr = ADFS_NDA_DIRECTORY \| ADFS_NDA_OWNER_READ \|
462	ADFS_NDA_OWNER_WRITE \| ADFS_NDA_PUBLIC_READ;
463
464	/*
465	* If this is a F+ disk with variable length directories,
466	* get the root_size from the disc record.
467	*/
468	if (asb->s_version) {
469	root_obj.size = le32_to_cpu(dr->root_size);
470	asb->s_dir = &adfs_fplus_dir_ops;
471	asb->s_namelen = ADFS_FPLUS_NAME_LEN;
472	} else {
473	asb->s_dir = &adfs_f_dir_ops;
474	asb->s_namelen = ADFS_F_NAME_LEN;
475	}
476
477	root = adfs_iget(sb, &root_obj);
478	sb->s_root = d_alloc_root(root);
479	if (!sb->s_root) {
480	int i;
481	iput(root);
482	for (i = 0; i < asb->s_map_size; i++)
483	brelse(asb->s_map[i].dm_bh);
484	kfree(asb->s_map);
485	adfs_error(sb, "get root inode failed\n");
486	goto error;
487	} else
488	sb->s_root->d_op = &adfs_dentry_operations;
489	return 0;
490
491	error_free_bh:
492	brelse(bh);
493	error:
494	sb->s_fs_info = NULL;
495	kfree(asb);
496	return -EINVAL;
497	}
498
454e2398 DH	499	static int adfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	500	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	501	{
454e2398 DH	502	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super,
454e2398 DH	503	mnt);
1da177e4 LT	504	}
	505
	506	static struct file_system_type adfs_fs_type = {
	507	.owner = THIS_MODULE,
	508	.name = "adfs",
	509	.get_sb = adfs_get_sb,
	510	.kill_sb = kill_block_super,
	511	.fs_flags = FS_REQUIRES_DEV,
	512	};
	513
	514	static int __init init_adfs_fs(void)
	515	{
	516	int err = init_inodecache();
	517	if (err)
	518	goto out1;
	519	err = register_filesystem(&adfs_fs_type);
	520	if (err)
	521	goto out;
	522	return 0;
	523	out:
	524	destroy_inodecache();
	525	out1:
	526	return err;
	527	}
	528
	529	static void __exit exit_adfs_fs(void)
	530	{
	531	unregister_filesystem(&adfs_fs_type);
	532	destroy_inodecache();
	533	}
	534
	535	module_init(init_adfs_fs)
	536	module_exit(exit_adfs_fs)