[mirror_ubuntu-artful-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/init.h>
#include <linux/buffer_head.h>
#include <linux/parser.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/statfs.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);

	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;
}

static int adfs_show_options(struct seq_file *seq, struct dentry *root)
{
	struct adfs_sb_info *asb = ADFS_SB(root->d_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);
	if (asb->s_ftsuffix != 0)
		seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);

	return 0;
}

enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, 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_ftsuffix, "ftsuffix=%u"},
	{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;
		case Opt_ftsuffix:
			if (match_int(args, &option))
				return -EINVAL;
			asb->s_ftsuffix = 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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
}

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

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;
	asb->s_ftsuffix = 0;

	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;
	/* Set root object date as 01 Jan 1987 00:00:00 */
	root_obj.loadaddr  = 0xfff0003f;
	root_obj.execaddr  = 0xec22c000;
	root_obj.size	   = ADFS_NEWDIR_SIZE;
	root_obj.attr	   = ADFS_NDA_DIRECTORY   | ADFS_NDA_OWNER_READ |
			     ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
	root_obj.filetype  = -1;

	/*
	 * 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;
	}
	/*
	 * ,xyz hex filetype suffix may be added by driver
	 * to files that have valid RISC OS filetype
	 */
	if (asb->s_ftsuffix)
		asb->s_namelen += 4;

	sb->s_d_op = &adfs_dentry_operations;
	root = adfs_iget(sb, &root_obj);
	sb->s_root = d_make_root(root);
	if (!sb->s_root) {
		int i;
		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;
	}
	return 0;

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

static struct dentry *adfs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
}

static struct file_system_type adfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "adfs",
	.mount		= adfs_mount,
	.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)
MODULE_LICENSE("GPL");
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>
1da177e4 LT	11	#include <linux/init.h>
1da177e4 LT	12	#include <linux/buffer_head.h>
1da177e4	13	#include <linux/parser.h>
e11400b0 MS	14	#include <linux/mount.h>
e11400b0 MS	15	#include <linux/seq_file.h>
5a0e3ad6	16	#include <linux/slab.h>
608ba50b	17	#include <linux/statfs.h>
1da177e4 LT	18	#include "adfs.h"
	19	#include "dir_f.h"
	20	#include "dir_fplus.h"
	21
e11400b0 MS	22	#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
	23	#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG \| S_IRWXO)
	24
1da177e4 LT	25	void __adfs_error(struct super_block sb, const char function, const char *fmt, ...)
	26	{
	27	char error_buf[128];
	28	va_list args;
	29
	30	va_start(args, fmt);
4a6e617a	31	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 LT	32	va_end(args);
	33
	34	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
	35	sb->s_id, function ? ": " : "",
	36	function ? function : "", error_buf);
	37	}
	38
	39	static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
	40	{
	41	int i;
	42
	43	/* sector size must be 256, 512 or 1024 bytes */
	44	if (dr->log2secsize != 8 &&
	45	dr->log2secsize != 9 &&
	46	dr->log2secsize != 10)
	47	return 1;
	48
	49	/* idlen must be at least log2secsize + 3 */
	50	if (dr->idlen < dr->log2secsize + 3)
	51	return 1;
	52
	53	/* we cannot have such a large disc that we
	54	* are unable to represent sector offsets in
	55	* 32 bits. This works out at 2.0 TB.
	56	*/
	57	if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
	58	return 1;
	59
	60	/* idlen must be no greater than 19 v2 [1.0] */
	61	if (dr->idlen > 19)
	62	return 1;
	63
	64	/* reserved bytes should be zero */
	65	for (i = 0; i < sizeof(dr->unused52); i++)
	66	if (dr->unused52[i] != 0)
	67	return 1;
	68
	69	return 0;
	70	}
	71
	72	static unsigned char adfs_calczonecheck(struct super_block sb, unsigned char map)
	73	{
	74	unsigned int v0, v1, v2, v3;
	75	int i;
	76
	77	v0 = v1 = v2 = v3 = 0;
	78	for (i = sb->s_blocksize - 4; i; i -= 4) {
	79	v0 += map[i] + (v3 >> 8);
	80	v3 &= 0xff;
	81	v1 += map[i + 1] + (v0 >> 8);
	82	v0 &= 0xff;
	83	v2 += map[i + 2] + (v1 >> 8);
	84	v1 &= 0xff;
	85	v3 += map[i + 3] + (v2 >> 8);
	86	v2 &= 0xff;
	87	}
	88	v0 += v3 >> 8;
	89	v1 += map[1] + (v0 >> 8);
	90	v2 += map[2] + (v1 >> 8);
	91	v3 += map[3] + (v2 >> 8);
	92
	93	return v0 ^ v1 ^ v2 ^ v3;
	94	}
	95
96	static int adfs_checkmap(struct super_block sb, struct adfs_discmap dm)
97	{
98	unsigned char crosscheck = 0, zonecheck = 1;
99	int i;
100
101	for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
102	unsigned char *map;
103
104	map = dm[i].dm_bh->b_data;
105
106	if (adfs_calczonecheck(sb, map) != map[0]) {
107	adfs_error(sb, "zone %d fails zonecheck", i);
108	zonecheck = 0;
109	}
110	crosscheck ^= map[3];
111	}
112	if (crosscheck != 0xff)
113	adfs_error(sb, "crosscheck != 0xff");
114	return crosscheck == 0xff && zonecheck;
115	}
116
117	static void adfs_put_super(struct super_block *sb)
118	{
119	int i;
120	struct adfs_sb_info *asb = ADFS_SB(sb);
121
122	for (i = 0; i < asb->s_map_size; i++)
123	brelse(asb->s_map[i].dm_bh);
124	kfree(asb->s_map);
125	kfree(asb);
126	sb->s_fs_info = NULL;
127	}
128
34c80b1d	129	static int adfs_show_options(struct seq_file seq, struct dentry root)
e11400b0	130	{
34c80b1d	131	struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
e11400b0 MS	132
	133	if (asb->s_uid != 0)
	134	seq_printf(seq, ",uid=%u", asb->s_uid);
	135	if (asb->s_gid != 0)
	136	seq_printf(seq, ",gid=%u", asb->s_gid);
	137	if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
	138	seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
	139	if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
	140	seq_printf(seq, ",othmask=%o", asb->s_other_mask);
da23ef05 SS	141	if (asb->s_ftsuffix != 0)
da23ef05 SS	142	seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
e11400b0 MS	143
	144	return 0;
	145	}
	146
da23ef05	147	enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
1da177e4	148
a447c093	149	static const match_table_t tokens = {
1da177e4 LT	150	{Opt_uid, "uid=%u"},
	151	{Opt_gid, "gid=%u"},
	152	{Opt_ownmask, "ownmask=%o"},
	153	{Opt_othmask, "othmask=%o"},
da23ef05	154	{Opt_ftsuffix, "ftsuffix=%u"},
1da177e4 LT	155	{Opt_err, NULL}
	156	};
	157
	158	static int parse_options(struct super_block sb, char options)
	159	{
	160	char *p;
	161	struct adfs_sb_info *asb = ADFS_SB(sb);
	162	int option;
	163
	164	if (!options)
	165	return 0;
	166
	167	while ((p = strsep(&options, ",")) != NULL) {
	168	substring_t args[MAX_OPT_ARGS];
	169	int token;
	170	if (!*p)
	171	continue;
	172
	173	token = match_token(p, tokens, args);
	174	switch (token) {
	175	case Opt_uid:
	176	if (match_int(args, &option))
	177	return -EINVAL;
	178	asb->s_uid = option;
	179	break;
	180	case Opt_gid:
	181	if (match_int(args, &option))
	182	return -EINVAL;
	183	asb->s_gid = option;
	184	break;
	185	case Opt_ownmask:
	186	if (match_octal(args, &option))
	187	return -EINVAL;
	188	asb->s_owner_mask = option;
	189	break;
	190	case Opt_othmask:
	191	if (match_octal(args, &option))
	192	return -EINVAL;
	193	asb->s_other_mask = option;
	194	break;
da23ef05 SS	195	case Opt_ftsuffix:
	196	if (match_int(args, &option))
	197	return -EINVAL;
	198	asb->s_ftsuffix = option;
	199	break;
1da177e4 LT	200	default:
	201	printk("ADFS-fs: unrecognised mount option \"%s\" "
	202	"or missing value\n", p);
	203	return -EINVAL;
	204	}
	205	}
	206	return 0;
	207	}
	208
	209	static int adfs_remount(struct super_block sb, int flags, char *data)
	210	{
	211	*flags \|= MS_NODIRATIME;
	212	return parse_options(sb, data);
	213	}
	214
726c3342	215	static int adfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	216	{
accb4012 CL	217	struct super_block *sb = dentry->d_sb;
	218	struct adfs_sb_info *sbi = ADFS_SB(sb);
	219	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	220
1da177e4 LT	221	buf->f_type = ADFS_SUPER_MAGIC;
accb4012 CL	222	buf->f_namelen = sbi->s_namelen;
	223	buf->f_bsize = sb->s_blocksize;
	224	buf->f_blocks = sbi->s_size;
	225	buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
1da177e4	226	buf->f_bavail =
accb4012	227	buf->f_bfree = adfs_map_free(sb);
1da177e4	228	buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
accb4012 CL	229	buf->f_fsid.val[0] = (u32)id;
accb4012 CL	230	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	231
	232	return 0;
	233	}
	234
e18b890b	235	static struct kmem_cache *adfs_inode_cachep;
1da177e4 LT	236
	237	static struct inode adfs_alloc_inode(struct super_block sb)
	238	{
	239	struct adfs_inode_info *ei;
e94b1766	240	ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	241	if (!ei)
	242	return NULL;
	243	return &ei->vfs_inode;
	244	}
	245
fa0d7e3d	246	static void adfs_i_callback(struct rcu_head *head)
1da177e4	247	{
fa0d7e3d	248	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	249	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
	250	}
	251
fa0d7e3d NP	252	static void adfs_destroy_inode(struct inode *inode)
	253	{
	254	call_rcu(&inode->i_rcu, adfs_i_callback);
	255	}
	256
51cc5068	257	static void init_once(void *foo)
1da177e4 LT	258	{
	259	struct adfs_inode_info ei = (struct adfs_inode_info ) foo;
	260
a35afb83	261	inode_init_once(&ei->vfs_inode);
1da177e4	262	}
20c2df83	263
1da177e4 LT	264	static int init_inodecache(void)
	265	{
	266	adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
	267	sizeof(struct adfs_inode_info),
fffb60f9 PJ	268	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	269	SLAB_MEM_SPREAD),
20c2df83	270	init_once);
1da177e4 LT	271	if (adfs_inode_cachep == NULL)
	272	return -ENOMEM;
	273	return 0;
	274	}
	275
	276	static void destroy_inodecache(void)
	277	{
1a1d92c1	278	kmem_cache_destroy(adfs_inode_cachep);
1da177e4 LT	279	}
1da177e4 LT	280
ee9b6d61	281	static const struct super_operations adfs_sops = {
1da177e4 LT	282	.alloc_inode = adfs_alloc_inode,
	283	.destroy_inode = adfs_destroy_inode,
	284	.write_inode = adfs_write_inode,
	285	.put_super = adfs_put_super,
	286	.statfs = adfs_statfs,
	287	.remount_fs = adfs_remount,
e11400b0	288	.show_options = adfs_show_options,
1da177e4 LT	289	};
	290
	291	static struct adfs_discmap adfs_read_map(struct super_block sb, struct adfs_discrecord *dr)
	292	{
	293	struct adfs_discmap *dm;
	294	unsigned int map_addr, zone_size, nzones;
	295	int i, zone;
	296	struct adfs_sb_info *asb = ADFS_SB(sb);
	297
	298	nzones = asb->s_map_size;
	299	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
	300	map_addr = (nzones >> 1) * zone_size -
	301	((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
	302	map_addr = signed_asl(map_addr, asb->s_map2blk);
	303
	304	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
	305
	306	dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
	307	if (dm == NULL) {
	308	adfs_error(sb, "not enough memory");
	309	return NULL;
	310	}
	311
	312	for (zone = 0; zone < nzones; zone++, map_addr++) {
	313	dm[zone].dm_startbit = 0;
	314	dm[zone].dm_endbit = zone_size;
	315	dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
	316	dm[zone].dm_bh = sb_bread(sb, map_addr);
	317
	318	if (!dm[zone].dm_bh) {
	319	adfs_error(sb, "unable to read map");
	320	goto error_free;
	321	}
	322	}
	323
	324	/* adjust the limits for the first and last map zones */
	325	i = zone - 1;
	326	dm[0].dm_startblk = 0;
	327	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
	328	dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
	329	(le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
	330	(ADFS_DR_SIZE_BITS - i * zone_size);
	331
	332	if (adfs_checkmap(sb, dm))
	333	return dm;
	334
1725cd0a	335	adfs_error(sb, "map corrupted");
1da177e4 LT	336
	337	error_free:
	338	while (--zone >= 0)
	339	brelse(dm[zone].dm_bh);
	340
	341	kfree(dm);
	342	return NULL;
	343	}
	344
	345	static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
	346	{
	347	unsigned long discsize;
	348
	349	discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
	350	discsize \|= le32_to_cpu(dr->disc_size) >> block_bits;
	351
	352	return discsize;
	353	}
	354
	355	static int adfs_fill_super(struct super_block sb, void data, int silent)
	356	{
	357	struct adfs_discrecord *dr;
	358	struct buffer_head *bh;
	359	struct object_info root_obj;
	360	unsigned char *b_data;
	361	struct adfs_sb_info *asb;
	362	struct inode *root;
	363
	364	sb->s_flags \|= MS_NODIRATIME;
	365
f8314dc6	366	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
4688a066	367	if (!asb)
1da177e4 LT	368	return -ENOMEM;
1da177e4 LT	369	sb->s_fs_info = asb;
1da177e4 LT	370
	371	/* set default options */
	372	asb->s_uid = 0;
	373	asb->s_gid = 0;
e11400b0 MS	374	asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
e11400b0 MS	375	asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
da23ef05	376	asb->s_ftsuffix = 0;
1da177e4 LT	377
	378	if (parse_options(sb, data))
	379	goto error;
	380
	381	sb_set_blocksize(sb, BLOCK_SIZE);
	382	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
	383	adfs_error(sb, "unable to read superblock");
	384	goto error;
	385	}
	386
	387	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
	388
	389	if (adfs_checkbblk(b_data)) {
	390	if (!silent)
	391	printk("VFS: Can't find an adfs filesystem on dev "
	392	"%s.\n", sb->s_id);
	393	goto error_free_bh;
	394	}
	395
	396	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	397
	398	/*
	399	* Do some sanity checks on the ADFS disc record
	400	*/
	401	if (adfs_checkdiscrecord(dr)) {
	402	if (!silent)
	403	printk("VPS: Can't find an adfs filesystem on dev "
	404	"%s.\n", sb->s_id);
	405	goto error_free_bh;
	406	}
	407
	408	brelse(bh);
	409	if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
	410	bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
	411	if (!bh) {
	412	adfs_error(sb, "couldn't read superblock on "
	413	"2nd try.");
	414	goto error;
	415	}
	416	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
	417	if (adfs_checkbblk(b_data)) {
	418	adfs_error(sb, "disc record mismatch, very weird!");
	419	goto error_free_bh;
	420	}
	421	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	422	} else {
	423	if (!silent)
	424	printk(KERN_ERR "VFS: Unsupported blocksize on dev "
	425	"%s.\n", sb->s_id);
	426	goto error;
	427	}
	428
	429	/*
	430	* blocksize on this device should now be set to the ADFS log2secsize
	431	*/
	432
	433	sb->s_magic = ADFS_SUPER_MAGIC;
	434	asb->s_idlen = dr->idlen;
	435	asb->s_map_size = dr->nzones \| (dr->nzones_high << 8);
	436	asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
	437	asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
	438	asb->s_version = dr->format_version;
	439	asb->s_log2sharesize = dr->log2sharesize;
	440
441	asb->s_map = adfs_read_map(sb, dr);
442	if (!asb->s_map)
443	goto error_free_bh;
444
445	brelse(bh);
446
447	/*
448	* set up enough so that we can read an inode
449	*/
450	sb->s_op = &adfs_sops;
451
452	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
453
454	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
455	root_obj.name_len = 0;
da23ef05 SS	456	/* Set root object date as 01 Jan 1987 00:00:00 */
	457	root_obj.loadaddr = 0xfff0003f;
	458	root_obj.execaddr = 0xec22c000;
1da177e4 LT	459	root_obj.size = ADFS_NEWDIR_SIZE;
	460	root_obj.attr = ADFS_NDA_DIRECTORY \| ADFS_NDA_OWNER_READ \|
	461	ADFS_NDA_OWNER_WRITE \| ADFS_NDA_PUBLIC_READ;
da23ef05	462	root_obj.filetype = -1;
1da177e4 LT	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	}
da23ef05 SS	476	/*
	477	* ,xyz hex filetype suffix may be added by driver
	478	* to files that have valid RISC OS filetype
	479	*/
	480	if (asb->s_ftsuffix)
	481	asb->s_namelen += 4;
1da177e4	482
96e13914	483	sb->s_d_op = &adfs_dentry_operations;
1da177e4	484	root = adfs_iget(sb, &root_obj);
48fde701	485	sb->s_root = d_make_root(root);
1da177e4 LT	486	if (!sb->s_root) {
1da177e4 LT	487	int i;
1da177e4 LT	488	for (i = 0; i < asb->s_map_size; i++)
	489	brelse(asb->s_map[i].dm_bh);
	490	kfree(asb->s_map);
	491	adfs_error(sb, "get root inode failed\n");
	492	goto error;
96e13914	493	}
1da177e4 LT	494	return 0;
	495
	496	error_free_bh:
	497	brelse(bh);
	498	error:
	499	sb->s_fs_info = NULL;
	500	kfree(asb);
	501	return -EINVAL;
	502	}
	503
152a0836 AV	504	static struct dentry adfs_mount(struct file_system_type fs_type,
152a0836 AV	505	int flags, const char dev_name, void data)
1da177e4	506	{
152a0836	507	return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
1da177e4 LT	508	}
	509
	510	static struct file_system_type adfs_fs_type = {
	511	.owner = THIS_MODULE,
	512	.name = "adfs",
152a0836	513	.mount = adfs_mount,
1da177e4 LT	514	.kill_sb = kill_block_super,
	515	.fs_flags = FS_REQUIRES_DEV,
	516	};
	517
	518	static int __init init_adfs_fs(void)
	519	{
	520	int err = init_inodecache();
	521	if (err)
	522	goto out1;
	523	err = register_filesystem(&adfs_fs_type);
	524	if (err)
	525	goto out;
	526	return 0;
	527	out:
	528	destroy_inodecache();
	529	out1:
	530	return err;
	531	}
	532
	533	static void __exit exit_adfs_fs(void)
	534	{
	535	unregister_filesystem(&adfs_fs_type);
	536	destroy_inodecache();
	537	}
	538
	539	module_init(init_adfs_fs)
	540	module_exit(exit_adfs_fs)
608ba50b	541	MODULE_LICENSE("GPL");