[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/smp_lock.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);

	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)
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>
405f5571	16	#include <linux/smp_lock.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
6cfd0148 CH	122	lock_kernel();
6cfd0148 CH	123
1da177e4 LT	124	for (i = 0; i < asb->s_map_size; i++)
	125	brelse(asb->s_map[i].dm_bh);
	126	kfree(asb->s_map);
	127	kfree(asb);
	128	sb->s_fs_info = NULL;
6cfd0148 CH	129
6cfd0148 CH	130	unlock_kernel();
1da177e4 LT	131	}
1da177e4 LT	132
e11400b0 MS	133	static int adfs_show_options(struct seq_file seq, struct vfsmount mnt)
	134	{
	135	struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb);
	136
	137	if (asb->s_uid != 0)
	138	seq_printf(seq, ",uid=%u", asb->s_uid);
	139	if (asb->s_gid != 0)
	140	seq_printf(seq, ",gid=%u", asb->s_gid);
	141	if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
	142	seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
	143	if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
	144	seq_printf(seq, ",othmask=%o", asb->s_other_mask);
	145
	146	return 0;
	147	}
	148
1da177e4 LT	149	enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
1da177e4 LT	150
a447c093	151	static const match_table_t tokens = {
1da177e4 LT	152	{Opt_uid, "uid=%u"},
	153	{Opt_gid, "gid=%u"},
	154	{Opt_ownmask, "ownmask=%o"},
	155	{Opt_othmask, "othmask=%o"},
	156	{Opt_err, NULL}
	157	};
	158
	159	static int parse_options(struct super_block sb, char options)
	160	{
	161	char *p;
	162	struct adfs_sb_info *asb = ADFS_SB(sb);
	163	int option;
	164
	165	if (!options)
	166	return 0;
	167
	168	while ((p = strsep(&options, ",")) != NULL) {
	169	substring_t args[MAX_OPT_ARGS];
	170	int token;
	171	if (!*p)
	172	continue;
	173
	174	token = match_token(p, tokens, args);
	175	switch (token) {
	176	case Opt_uid:
	177	if (match_int(args, &option))
	178	return -EINVAL;
	179	asb->s_uid = option;
	180	break;
	181	case Opt_gid:
	182	if (match_int(args, &option))
	183	return -EINVAL;
	184	asb->s_gid = option;
	185	break;
	186	case Opt_ownmask:
	187	if (match_octal(args, &option))
	188	return -EINVAL;
	189	asb->s_owner_mask = option;
	190	break;
	191	case Opt_othmask:
	192	if (match_octal(args, &option))
	193	return -EINVAL;
	194	asb->s_other_mask = option;
	195	break;
	196	default:
	197	printk("ADFS-fs: unrecognised mount option \"%s\" "
	198	"or missing value\n", p);
	199	return -EINVAL;
	200	}
	201	}
	202	return 0;
	203	}
	204
	205	static int adfs_remount(struct super_block sb, int flags, char *data)
	206	{
	207	*flags \|= MS_NODIRATIME;
	208	return parse_options(sb, data);
	209	}
	210
726c3342	211	static int adfs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	212	{
accb4012 CL	213	struct super_block *sb = dentry->d_sb;
	214	struct adfs_sb_info *sbi = ADFS_SB(sb);
	215	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	216
1da177e4 LT	217	buf->f_type = ADFS_SUPER_MAGIC;
accb4012 CL	218	buf->f_namelen = sbi->s_namelen;
	219	buf->f_bsize = sb->s_blocksize;
	220	buf->f_blocks = sbi->s_size;
	221	buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
1da177e4	222	buf->f_bavail =
accb4012	223	buf->f_bfree = adfs_map_free(sb);
1da177e4	224	buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
accb4012 CL	225	buf->f_fsid.val[0] = (u32)id;
accb4012 CL	226	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	227
	228	return 0;
	229	}
	230
e18b890b	231	static struct kmem_cache *adfs_inode_cachep;
1da177e4 LT	232
	233	static struct inode adfs_alloc_inode(struct super_block sb)
	234	{
	235	struct adfs_inode_info *ei;
e94b1766	236	ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
1da177e4 LT	237	if (!ei)
	238	return NULL;
	239	return &ei->vfs_inode;
	240	}
	241
	242	static void adfs_destroy_inode(struct inode *inode)
	243	{
	244	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
	245	}
	246
51cc5068	247	static void init_once(void *foo)
1da177e4 LT	248	{
	249	struct adfs_inode_info ei = (struct adfs_inode_info ) foo;
	250
a35afb83	251	inode_init_once(&ei->vfs_inode);
1da177e4	252	}
20c2df83	253
1da177e4 LT	254	static int init_inodecache(void)
	255	{
	256	adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
	257	sizeof(struct adfs_inode_info),
fffb60f9 PJ	258	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	259	SLAB_MEM_SPREAD),
20c2df83	260	init_once);
1da177e4 LT	261	if (adfs_inode_cachep == NULL)
	262	return -ENOMEM;
	263	return 0;
	264	}
	265
	266	static void destroy_inodecache(void)
	267	{
1a1d92c1	268	kmem_cache_destroy(adfs_inode_cachep);
1da177e4 LT	269	}
1da177e4 LT	270
ee9b6d61	271	static const struct super_operations adfs_sops = {
1da177e4 LT	272	.alloc_inode = adfs_alloc_inode,
	273	.destroy_inode = adfs_destroy_inode,
	274	.write_inode = adfs_write_inode,
	275	.put_super = adfs_put_super,
	276	.statfs = adfs_statfs,
	277	.remount_fs = adfs_remount,
e11400b0	278	.show_options = adfs_show_options,
1da177e4 LT	279	};
	280
	281	static struct adfs_discmap adfs_read_map(struct super_block sb, struct adfs_discrecord *dr)
	282	{
	283	struct adfs_discmap *dm;
	284	unsigned int map_addr, zone_size, nzones;
	285	int i, zone;
	286	struct adfs_sb_info *asb = ADFS_SB(sb);
	287
	288	nzones = asb->s_map_size;
	289	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
	290	map_addr = (nzones >> 1) * zone_size -
	291	((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
	292	map_addr = signed_asl(map_addr, asb->s_map2blk);
	293
	294	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
	295
	296	dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
	297	if (dm == NULL) {
	298	adfs_error(sb, "not enough memory");
	299	return NULL;
	300	}
	301
	302	for (zone = 0; zone < nzones; zone++, map_addr++) {
	303	dm[zone].dm_startbit = 0;
	304	dm[zone].dm_endbit = zone_size;
	305	dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
	306	dm[zone].dm_bh = sb_bread(sb, map_addr);
	307
	308	if (!dm[zone].dm_bh) {
	309	adfs_error(sb, "unable to read map");
	310	goto error_free;
	311	}
	312	}
	313
	314	/* adjust the limits for the first and last map zones */
	315	i = zone - 1;
	316	dm[0].dm_startblk = 0;
	317	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
	318	dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
	319	(le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
	320	(ADFS_DR_SIZE_BITS - i * zone_size);
	321
	322	if (adfs_checkmap(sb, dm))
	323	return dm;
	324
1725cd0a	325	adfs_error(sb, "map corrupted");
1da177e4 LT	326
	327	error_free:
	328	while (--zone >= 0)
	329	brelse(dm[zone].dm_bh);
	330
	331	kfree(dm);
	332	return NULL;
	333	}
	334
	335	static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
	336	{
	337	unsigned long discsize;
	338
	339	discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
	340	discsize \|= le32_to_cpu(dr->disc_size) >> block_bits;
	341
	342	return discsize;
	343	}
	344
	345	static int adfs_fill_super(struct super_block sb, void data, int silent)
	346	{
	347	struct adfs_discrecord *dr;
	348	struct buffer_head *bh;
	349	struct object_info root_obj;
	350	unsigned char *b_data;
	351	struct adfs_sb_info *asb;
	352	struct inode *root;
	353
	354	sb->s_flags \|= MS_NODIRATIME;
	355
f8314dc6	356	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
1da177e4 LT	357	if (!asb)
	358	return -ENOMEM;
	359	sb->s_fs_info = asb;
1da177e4 LT	360
	361	/* set default options */
	362	asb->s_uid = 0;
	363	asb->s_gid = 0;
e11400b0 MS	364	asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
e11400b0 MS	365	asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
1da177e4 LT	366
	367	if (parse_options(sb, data))
	368	goto error;
	369
	370	sb_set_blocksize(sb, BLOCK_SIZE);
	371	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
	372	adfs_error(sb, "unable to read superblock");
	373	goto error;
	374	}
	375
	376	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
	377
	378	if (adfs_checkbblk(b_data)) {
	379	if (!silent)
	380	printk("VFS: Can't find an adfs filesystem on dev "
	381	"%s.\n", sb->s_id);
	382	goto error_free_bh;
	383	}
	384
	385	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	386
	387	/*
	388	* Do some sanity checks on the ADFS disc record
	389	*/
	390	if (adfs_checkdiscrecord(dr)) {
	391	if (!silent)
	392	printk("VPS: Can't find an adfs filesystem on dev "
	393	"%s.\n", sb->s_id);
	394	goto error_free_bh;
	395	}
	396
	397	brelse(bh);
	398	if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
	399	bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
	400	if (!bh) {
	401	adfs_error(sb, "couldn't read superblock on "
	402	"2nd try.");
	403	goto error;
	404	}
	405	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
	406	if (adfs_checkbblk(b_data)) {
	407	adfs_error(sb, "disc record mismatch, very weird!");
	408	goto error_free_bh;
	409	}
	410	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
	411	} else {
	412	if (!silent)
	413	printk(KERN_ERR "VFS: Unsupported blocksize on dev "
	414	"%s.\n", sb->s_id);
	415	goto error;
	416	}
	417
	418	/*
	419	* blocksize on this device should now be set to the ADFS log2secsize
	420	*/
	421
	422	sb->s_magic = ADFS_SUPER_MAGIC;
	423	asb->s_idlen = dr->idlen;
	424	asb->s_map_size = dr->nzones \| (dr->nzones_high << 8);
	425	asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
	426	asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
	427	asb->s_version = dr->format_version;
	428	asb->s_log2sharesize = dr->log2sharesize;
	429
430	asb->s_map = adfs_read_map(sb, dr);
431	if (!asb->s_map)
432	goto error_free_bh;
433
434	brelse(bh);
435
436	/*
437	* set up enough so that we can read an inode
438	*/
439	sb->s_op = &adfs_sops;
440
441	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
442
443	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
444	root_obj.name_len = 0;
445	root_obj.loadaddr = 0;
446	root_obj.execaddr = 0;
447	root_obj.size = ADFS_NEWDIR_SIZE;
448	root_obj.attr = ADFS_NDA_DIRECTORY \| ADFS_NDA_OWNER_READ \|
449	ADFS_NDA_OWNER_WRITE \| ADFS_NDA_PUBLIC_READ;
450
451	/*
452	* If this is a F+ disk with variable length directories,
453	* get the root_size from the disc record.
454	*/
455	if (asb->s_version) {
456	root_obj.size = le32_to_cpu(dr->root_size);
457	asb->s_dir = &adfs_fplus_dir_ops;
458	asb->s_namelen = ADFS_FPLUS_NAME_LEN;
459	} else {
460	asb->s_dir = &adfs_f_dir_ops;
461	asb->s_namelen = ADFS_F_NAME_LEN;
462	}
463
464	root = adfs_iget(sb, &root_obj);
465	sb->s_root = d_alloc_root(root);
466	if (!sb->s_root) {
467	int i;
468	iput(root);
469	for (i = 0; i < asb->s_map_size; i++)
470	brelse(asb->s_map[i].dm_bh);
471	kfree(asb->s_map);
472	adfs_error(sb, "get root inode failed\n");
473	goto error;
474	} else
475	sb->s_root->d_op = &adfs_dentry_operations;
476	return 0;
477
478	error_free_bh:
479	brelse(bh);
480	error:
481	sb->s_fs_info = NULL;
482	kfree(asb);
483	return -EINVAL;
484	}
485
454e2398 DH	486	static int adfs_get_sb(struct file_system_type *fs_type,
454e2398 DH	487	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	488	{
454e2398 DH	489	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super,
454e2398 DH	490	mnt);
1da177e4 LT	491	}
	492
	493	static struct file_system_type adfs_fs_type = {
	494	.owner = THIS_MODULE,
	495	.name = "adfs",
	496	.get_sb = adfs_get_sb,
	497	.kill_sb = kill_block_super,
	498	.fs_flags = FS_REQUIRES_DEV,
	499	};
	500
	501	static int __init init_adfs_fs(void)
	502	{
	503	int err = init_inodecache();
	504	if (err)
	505	goto out1;
	506	err = register_filesystem(&adfs_fs_type);
	507	if (err)
	508	goto out;
	509	return 0;
	510	out:
	511	destroy_inodecache();
	512	out1:
	513	return err;
	514	}
	515
	516	static void __exit exit_adfs_fs(void)
	517	{
	518	unregister_filesystem(&adfs_fs_type);
	519	destroy_inodecache();
	520	}
	521
	522	module_init(init_adfs_fs)
	523	module_exit(exit_adfs_fs)
608ba50b	524	MODULE_LICENSE("GPL");