1 files changed, 508 insertions, 0 deletions

diff --git a/fs/adfs/super.c b/fs/adfs/super.c
new file mode 100644
index 0000000..2439632
--- /dev/null
+++ b/fs/adfs/super.c
@@ -0,0 +1,508 @@
+/*
+ *  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);
+	vsprintf(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 super_block *sb, struct kstatfs *buf)
+{
+	struct adfs_sb_info *asb = ADFS_SB(sb);
+
+	buf->f_type    = ADFS_SUPER_MAGIC;
+	buf->f_namelen = asb->s_namelen;
+	buf->f_bsize   = 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(sb);
+	buf->f_ffree   = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
+
+	return 0;
+}
+
+static kmem_cache_t *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, SLAB_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, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    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,
+					     init_once, NULL);
+	if (adfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	if (kmem_cache_destroy(adfs_inode_cachep))
+		printk(KERN_INFO "adfs_inode_cache: not all structures were freed\n");
+}
+
+static 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, NULL, "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 = kmalloc(sizeof(*asb), GFP_KERNEL);
+	if (!asb)
+		return -ENOMEM;
+	sb->s_fs_info = asb;
+	memset(asb, 0, sizeof(*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 struct super_block *adfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
+}
+
+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)