[mirror_ubuntu-bionic-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 <asm/uaccess.h>
#include <asm/system.h>

#include <stdarg.h>

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

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);

	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;
}

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

static 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 adfs_sb_info *asb = ADFS_SB(dentry->d_sb);

	buf->f_type    = ADFS_SUPER_MAGIC;
	buf->f_namelen = asb->s_namelen;
	buf->f_bsize   = dentry->d_sb->s_blocksize;
	buf->f_blocks  = asb->s_size;
	buf->f_files   = asb->s_ids_per_zone * asb->s_map_size;
	buf->f_bavail  =
	buf->f_bfree   = adfs_map_free(dentry->d_sb);
	buf->f_ffree   = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;

	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 kmem_cache * cachep, unsigned long flags)
{
	struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;

	if (flags & SLAB_CTOR_CONSTRUCTOR)
		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, NULL);
	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,
};

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 = S_IRWXU;
	asb->s_other_mask = S_IRWXG | S_IRWXO;

	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>
	23
	24	#include <asm/uaccess.h>
	25	#include <asm/system.h>
	26
	27	#include <stdarg.h>
	28
	29	#include "adfs.h"
	30	#include "dir_f.h"
	31	#include "dir_fplus.h"
	32
	33	void __adfs_error(struct super_block sb, const char function, const char *fmt, ...)
	34	{
	35	char error_buf[128];
	36	va_list args;
	37
	38	va_start(args, fmt);
4a6e617a	39	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 LT	40	va_end(args);
	41
	42	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
	43	sb->s_id, function ? ": " : "",
	44	function ? function : "", error_buf);
	45	}
	46
	47	static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
	48	{
	49	int i;
	50
	51	/* sector size must be 256, 512 or 1024 bytes */
	52	if (dr->log2secsize != 8 &&
	53	dr->log2secsize != 9 &&
	54	dr->log2secsize != 10)
	55	return 1;
	56
	57	/* idlen must be at least log2secsize + 3 */
	58	if (dr->idlen < dr->log2secsize + 3)
	59	return 1;
	60
	61	/* we cannot have such a large disc that we
	62	* are unable to represent sector offsets in
	63	* 32 bits. This works out at 2.0 TB.
	64	*/
	65	if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
	66	return 1;
	67
	68	/* idlen must be no greater than 19 v2 [1.0] */
	69	if (dr->idlen > 19)
	70	return 1;
	71
	72	/* reserved bytes should be zero */
	73	for (i = 0; i < sizeof(dr->unused52); i++)
	74	if (dr->unused52[i] != 0)
	75	return 1;
	76
	77	return 0;
	78	}
	79
	80	static unsigned char adfs_calczonecheck(struct super_block sb, unsigned char map)
	81	{
	82	unsigned int v0, v1, v2, v3;
	83	int i;
	84
	85	v0 = v1 = v2 = v3 = 0;
	86	for (i = sb->s_blocksize - 4; i; i -= 4) {
	87	v0 += map[i] + (v3 >> 8);
	88	v3 &= 0xff;
	89	v1 += map[i + 1] + (v0 >> 8);
	90	v0 &= 0xff;
	91	v2 += map[i + 2] + (v1 >> 8);
	92	v1 &= 0xff;
	93	v3 += map[i + 3] + (v2 >> 8);
	94	v2 &= 0xff;
	95	}
	96	v0 += v3 >> 8;
	97	v1 += map[1] + (v0 >> 8);
	98	v2 += map[2] + (v1 >> 8);
	99	v3 += map[3] + (v2 >> 8);
	100
	101	return v0 ^ v1 ^ v2 ^ v3;
	102	}
	103
104	static int adfs_checkmap(struct super_block sb, struct adfs_discmap dm)
105	{
106	unsigned char crosscheck = 0, zonecheck = 1;
107	int i;
108
109	for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
110	unsigned char *map;
111
112	map = dm[i].dm_bh->b_data;
113
114	if (adfs_calczonecheck(sb, map) != map[0]) {
115	adfs_error(sb, "zone %d fails zonecheck", i);
116	zonecheck = 0;
117	}
118	crosscheck ^= map[3];
119	}
120	if (crosscheck != 0xff)
121	adfs_error(sb, "crosscheck != 0xff");
122	return crosscheck == 0xff && zonecheck;
123	}
124
125	static void adfs_put_super(struct super_block *sb)
126	{
127	int i;
128	struct adfs_sb_info *asb = ADFS_SB(sb);
129
130	for (i = 0; i < asb->s_map_size; i++)
131	brelse(asb->s_map[i].dm_bh);
132	kfree(asb->s_map);
133	kfree(asb);
134	sb->s_fs_info = NULL;
135	}
136
137	enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
138
139	static match_table_t tokens = {
140	{Opt_uid, "uid=%u"},
141	{Opt_gid, "gid=%u"},
142	{Opt_ownmask, "ownmask=%o"},
143	{Opt_othmask, "othmask=%o"},
144	{Opt_err, NULL}
145	};
146
147	static int parse_options(struct super_block sb, char options)
148	{
149	char *p;
150	struct adfs_sb_info *asb = ADFS_SB(sb);
151	int option;
152
153	if (!options)
154	return 0;
155
156	while ((p = strsep(&options, ",")) != NULL) {
157	substring_t args[MAX_OPT_ARGS];
158	int token;
159	if (!*p)
160	continue;
161
162	token = match_token(p, tokens, args);
163	switch (token) {
164	case Opt_uid:
165	if (match_int(args, &option))
166	return -EINVAL;
167	asb->s_uid = option;
168	break;
169	case Opt_gid:
170	if (match_int(args, &option))
171	return -EINVAL;
172	asb->s_gid = option;
173	break;
174	case Opt_ownmask:
175	if (match_octal(args, &option))
176	return -EINVAL;
177	asb->s_owner_mask = option;
178	break;
179	case Opt_othmask:
180	if (match_octal(args, &option))
181	return -EINVAL;
182	asb->s_other_mask = option;
183	break;
184	default:
185	printk("ADFS-fs: unrecognised mount option \"%s\" "
186	"or missing value\n", p);
187	return -EINVAL;
188	}
189	}
190	return 0;
191	}
192
193	static int adfs_remount(struct super_block sb, int flags, char *data)
194	{
195	*flags \|= MS_NODIRATIME;
196	return parse_options(sb, data);
197	}
198
726c3342	199	static int adfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	200	{
726c3342	201	struct adfs_sb_info *asb = ADFS_SB(dentry->d_sb);
1da177e4 LT	202
	203	buf->f_type = ADFS_SUPER_MAGIC;
	204	buf->f_namelen = asb->s_namelen;
726c3342	205	buf->f_bsize = dentry->d_sb->s_blocksize;
1da177e4 LT	206	buf->f_blocks = asb->s_size;
	207	buf->f_files = asb->s_ids_per_zone * asb->s_map_size;
	208	buf->f_bavail =
726c3342	209	buf->f_bfree = adfs_map_free(dentry->d_sb);
1da177e4 LT	210	buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
	211
	212	return 0;
	213	}
	214
e18b890b	215	static struct kmem_cache *adfs_inode_cachep;
1da177e4 LT	216
	217	static struct inode adfs_alloc_inode(struct super_block sb)
	218	{
	219	struct adfs_inode_info *ei;
e94b1766	220	ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	221	if (!ei)
	222	return NULL;
	223	return &ei->vfs_inode;
	224	}
	225
	226	static void adfs_destroy_inode(struct inode *inode)
	227	{
	228	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
	229	}
	230
e18b890b	231	static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1da177e4 LT	232	{
	233	struct adfs_inode_info ei = (struct adfs_inode_info ) foo;
	234
50953fe9	235	if (flags & SLAB_CTOR_CONSTRUCTOR)
1da177e4 LT	236	inode_init_once(&ei->vfs_inode);
	237	}
	238
	239	static int init_inodecache(void)
	240	{
	241	adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
	242	sizeof(struct adfs_inode_info),
fffb60f9 PJ	243	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	244	SLAB_MEM_SPREAD),
1da177e4 LT	245	init_once, NULL);
	246	if (adfs_inode_cachep == NULL)
	247	return -ENOMEM;
	248	return 0;
	249	}
	250
	251	static void destroy_inodecache(void)
	252	{
1a1d92c1	253	kmem_cache_destroy(adfs_inode_cachep);
1da177e4 LT	254	}
1da177e4 LT	255
ee9b6d61	256	static const struct super_operations adfs_sops = {
1da177e4 LT	257	.alloc_inode = adfs_alloc_inode,
	258	.destroy_inode = adfs_destroy_inode,
	259	.write_inode = adfs_write_inode,
	260	.put_super = adfs_put_super,
	261	.statfs = adfs_statfs,
	262	.remount_fs = adfs_remount,
	263	};
	264
	265	static struct adfs_discmap adfs_read_map(struct super_block sb, struct adfs_discrecord *dr)
	266	{
	267	struct adfs_discmap *dm;
	268	unsigned int map_addr, zone_size, nzones;
	269	int i, zone;
	270	struct adfs_sb_info *asb = ADFS_SB(sb);
	271
	272	nzones = asb->s_map_size;
	273	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
	274	map_addr = (nzones >> 1) * zone_size -
	275	((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
	276	map_addr = signed_asl(map_addr, asb->s_map2blk);
	277
	278	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
	279
	280	dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
	281	if (dm == NULL) {
	282	adfs_error(sb, "not enough memory");
	283	return NULL;
	284	}
	285
	286	for (zone = 0; zone < nzones; zone++, map_addr++) {
	287	dm[zone].dm_startbit = 0;
	288	dm[zone].dm_endbit = zone_size;
	289	dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
	290	dm[zone].dm_bh = sb_bread(sb, map_addr);
	291
	292	if (!dm[zone].dm_bh) {
	293	adfs_error(sb, "unable to read map");
	294	goto error_free;
	295	}
	296	}
	297
	298	/* adjust the limits for the first and last map zones */
	299	i = zone - 1;
	300	dm[0].dm_startblk = 0;
	301	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
	302	dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
	303	(le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
	304	(ADFS_DR_SIZE_BITS - i * zone_size);
	305
	306	if (adfs_checkmap(sb, dm))
	307	return dm;
	308
1725cd0a	309	adfs_error(sb, "map corrupted");
1da177e4 LT	310
	311	error_free:
	312	while (--zone >= 0)
	313	brelse(dm[zone].dm_bh);
	314
	315	kfree(dm);
	316	return NULL;
	317	}
	318
	319	static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
	320	{
	321	unsigned long discsize;
	322
	323	discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
	324	discsize \|= le32_to_cpu(dr->disc_size) >> block_bits;
	325
	326	return discsize;
	327	}
	328
	329	static int adfs_fill_super(struct super_block sb, void data, int silent)
	330	{
	331	struct adfs_discrecord *dr;
	332	struct buffer_head *bh;
	333	struct object_info root_obj;
	334	unsigned char *b_data;
	335	struct adfs_sb_info *asb;
	336	struct inode *root;
	337
	338	sb->s_flags \|= MS_NODIRATIME;
	339
f8314dc6	340	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
1da177e4 LT	341	if (!asb)
	342	return -ENOMEM;
	343	sb->s_fs_info = asb;
1da177e4 LT	344
	345	/* set default options */
	346	asb->s_uid = 0;
	347	asb->s_gid = 0;
	348	asb->s_owner_mask = S_IRWXU;
	349	asb->s_other_mask = S_IRWXG \| S_IRWXO;
	350
	351	if (parse_options(sb, data))
	352	goto error;
	353
	354	sb_set_blocksize(sb, BLOCK_SIZE);
	355	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
	356	adfs_error(sb, "unable to read superblock");
	357	goto error;
	358	}
	359
	360	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
	361
	362	if (adfs_checkbblk(b_data)) {
	363	if (!silent)
	364	printk("VFS: Can't find an adfs filesystem on dev "
	365	"%s.\n", sb->s_id);
	366	goto error_free_bh;
	367	}
	368
	369	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	370
	371	/*
	372	* Do some sanity checks on the ADFS disc record
	373	*/
	374	if (adfs_checkdiscrecord(dr)) {
	375	if (!silent)
	376	printk("VPS: Can't find an adfs filesystem on dev "
	377	"%s.\n", sb->s_id);
	378	goto error_free_bh;
	379	}
	380
	381	brelse(bh);
	382	if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
	383	bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
	384	if (!bh) {
	385	adfs_error(sb, "couldn't read superblock on "
	386	"2nd try.");
	387	goto error;
	388	}
	389	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
	390	if (adfs_checkbblk(b_data)) {
	391	adfs_error(sb, "disc record mismatch, very weird!");
	392	goto error_free_bh;
	393	}
	394	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	395	} else {
	396	if (!silent)
	397	printk(KERN_ERR "VFS: Unsupported blocksize on dev "
	398	"%s.\n", sb->s_id);
	399	goto error;
	400	}
	401
	402	/*
	403	* blocksize on this device should now be set to the ADFS log2secsize
	404	*/
	405
	406	sb->s_magic = ADFS_SUPER_MAGIC;
	407	asb->s_idlen = dr->idlen;
408	asb->s_map_size = dr->nzones \| (dr->nzones_high << 8);
409	asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
410	asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
411	asb->s_version = dr->format_version;
412	asb->s_log2sharesize = dr->log2sharesize;
413
414	asb->s_map = adfs_read_map(sb, dr);
415	if (!asb->s_map)
416	goto error_free_bh;
417
418	brelse(bh);
419
420	/*
421	* set up enough so that we can read an inode
422	*/
423	sb->s_op = &adfs_sops;
424
425	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
426
427	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
428	root_obj.name_len = 0;
429	root_obj.loadaddr = 0;
430	root_obj.execaddr = 0;
431	root_obj.size = ADFS_NEWDIR_SIZE;
432	root_obj.attr = ADFS_NDA_DIRECTORY \| ADFS_NDA_OWNER_READ \|
433	ADFS_NDA_OWNER_WRITE \| ADFS_NDA_PUBLIC_READ;
434
435	/*
436	* If this is a F+ disk with variable length directories,
437	* get the root_size from the disc record.
438	*/
439	if (asb->s_version) {
440	root_obj.size = le32_to_cpu(dr->root_size);
441	asb->s_dir = &adfs_fplus_dir_ops;
442	asb->s_namelen = ADFS_FPLUS_NAME_LEN;
443	} else {
444	asb->s_dir = &adfs_f_dir_ops;
445	asb->s_namelen = ADFS_F_NAME_LEN;
446	}
447
448	root = adfs_iget(sb, &root_obj);
449	sb->s_root = d_alloc_root(root);
450	if (!sb->s_root) {
451	int i;
452	iput(root);
453	for (i = 0; i < asb->s_map_size; i++)
454	brelse(asb->s_map[i].dm_bh);
455	kfree(asb->s_map);
456	adfs_error(sb, "get root inode failed\n");
457	goto error;
458	} else
459	sb->s_root->d_op = &adfs_dentry_operations;
460	return 0;
461
462	error_free_bh:
463	brelse(bh);
464	error:
465	sb->s_fs_info = NULL;
466	kfree(asb);
467	return -EINVAL;
468	}
469
454e2398 DH	470	static int adfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	471	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	472	{
454e2398 DH	473	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super,
454e2398 DH	474	mnt);
1da177e4 LT	475	}
	476
	477	static struct file_system_type adfs_fs_type = {
	478	.owner = THIS_MODULE,
	479	.name = "adfs",
	480	.get_sb = adfs_get_sb,
	481	.kill_sb = kill_block_super,
	482	.fs_flags = FS_REQUIRES_DEV,
	483	};
	484
	485	static int __init init_adfs_fs(void)
	486	{
	487	int err = init_inodecache();
	488	if (err)
	489	goto out1;
	490	err = register_filesystem(&adfs_fs_type);
	491	if (err)
	492	goto out;
	493	return 0;
	494	out:
	495	destroy_inodecache();
	496	out1:
	497	return err;
	498	}
	499
	500	static void __exit exit_adfs_fs(void)
	501	{
	502	unregister_filesystem(&adfs_fs_type);
	503	destroy_inodecache();
	504	}
	505
	506	module_init(init_adfs_fs)
	507	module_exit(exit_adfs_fs)