Esempio n. 1
0
static int
affs_readdir(struct file *file, struct dir_context *ctx)
{
	struct inode		*inode = file_inode(file);
	struct super_block	*sb = inode->i_sb;
	struct buffer_head	*dir_bh = NULL;
	struct buffer_head	*fh_bh = NULL;
	unsigned char		*name;
	int			 namelen;
	u32			 i;
	int			 hash_pos;
	int			 chain_pos;
	u32			 ino;
	int			 error = 0;

	pr_debug("%s(ino=%lu,f_pos=%llx)\n", __func__, inode->i_ino, ctx->pos);

	if (ctx->pos < 2) {
		file->private_data = (void *)0;
		if (!dir_emit_dots(file, ctx))
			return 0;
	}

	affs_lock_dir(inode);
	chain_pos = (ctx->pos - 2) & 0xffff;
	hash_pos  = (ctx->pos - 2) >> 16;
	if (chain_pos == 0xffff) {
		affs_warning(sb, "readdir", "More than 65535 entries in chain");
		chain_pos = 0;
		hash_pos++;
		ctx->pos = ((hash_pos << 16) | chain_pos) + 2;
	}
	dir_bh = affs_bread(sb, inode->i_ino);
	if (!dir_bh)
		goto out_unlock_dir;

	/* If the directory hasn't changed since the last call to readdir(),
	 * we can jump directly to where we left off.
	 */
	ino = (u32)(long)file->private_data;
	if (ino && file->f_version == inode->i_version) {
		pr_debug("readdir() left off=%d\n", ino);
		goto inside;
	}

	ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
	for (i = 0; ino && i < chain_pos; i++) {
		fh_bh = affs_bread(sb, ino);
		if (!fh_bh) {
			affs_error(sb, "readdir","Cannot read block %d", i);
			error = -EIO;
			goto out_brelse_dir;
		}
		ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
		affs_brelse(fh_bh);
		fh_bh = NULL;
	}
	if (ino)
		goto inside;
	hash_pos++;

	for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
		ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
		if (!ino)
			continue;
		ctx->pos = (hash_pos << 16) + 2;
inside:
		do {
			fh_bh = affs_bread(sb, ino);
			if (!fh_bh) {
				affs_error(sb, "readdir",
					   "Cannot read block %d", ino);
				break;
			}

			namelen = min(AFFS_TAIL(sb, fh_bh)->name[0],
				      (u8)AFFSNAMEMAX);
			name = AFFS_TAIL(sb, fh_bh)->name + 1;
			pr_debug("readdir(): dir_emit(\"%.*s\", ino=%u), hash=%d, f_pos=%llx\n",
				 namelen, name, ino, hash_pos, ctx->pos);

			if (!dir_emit(ctx, name, namelen, ino, DT_UNKNOWN))
				goto done;
			ctx->pos++;
			ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
			affs_brelse(fh_bh);
			fh_bh = NULL;
		} while (ino);
	}
done:
	file->f_version = inode->i_version;
	file->private_data = (void *)(long)ino;
	affs_brelse(fh_bh);

out_brelse_dir:
	affs_brelse(dir_bh);

out_unlock_dir:
	affs_unlock_dir(inode);
	return error;
}
Esempio n. 2
0
struct inode *affs_iget(struct super_block *sb, unsigned long ino)
{
    struct affs_sb_info	*sbi = AFFS_SB(sb);
    struct buffer_head	*bh;
    //	struct affs_head	*head;
    struct affs_tail	*tail;
    struct inode		*inode;
    u32			 block;
    u32			 size;
    u32			 prot;
    u16			 id;

    inode = iget_locked(sb, ino);
    if (!inode)
        return ERR_PTR(-ENOMEM);
    if (!(inode->i_state & I_NEW))
        return inode;

    pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);

    block = inode->i_ino;
    bh = affs_bread(sb, block);
    if (!bh) {
        affs_warning(sb, "read_inode", "Cannot read block %d", block);
        goto bad_inode;
    }
    if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
        affs_warning(sb,"read_inode",
                     "Checksum or type (ptype=%d) error on inode %d",
                     AFFS_HEAD(bh)->ptype, block);
        goto bad_inode;
    }

    //	head = AFFS_HEAD(bh);
    tail = AFFS_TAIL(sb, bh);
    prot = be32_to_cpu(tail->protect);

    inode->i_size = 0;
    inode->i_nlink = 1;
    inode->i_mode = 0;
    AFFS_I(inode)->i_extcnt = 1;
    AFFS_I(inode)->i_ext_last = ~1;
    AFFS_I(inode)->i_protect = prot;
    atomic_set(&AFFS_I(inode)->i_opencnt, 0);
    AFFS_I(inode)->i_blkcnt = 0;
    AFFS_I(inode)->i_lc = NULL;
    AFFS_I(inode)->i_lc_size = 0;
    AFFS_I(inode)->i_lc_shift = 0;
    AFFS_I(inode)->i_lc_mask = 0;
    AFFS_I(inode)->i_ac = NULL;
    AFFS_I(inode)->i_ext_bh = NULL;
    AFFS_I(inode)->mmu_private = 0;
    AFFS_I(inode)->i_lastalloc = 0;
    AFFS_I(inode)->i_pa_cnt = 0;

    if (sbi->s_flags & SF_SETMODE)
        inode->i_mode = sbi->s_mode;
    else
        inode->i_mode = prot_to_mode(prot);

    id = be16_to_cpu(tail->uid);
    if (id == 0 || sbi->s_flags & SF_SETUID)
        inode->i_uid = sbi->s_uid;
    else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
        inode->i_uid = 0;
    else
        inode->i_uid = id;

    id = be16_to_cpu(tail->gid);
    if (id == 0 || sbi->s_flags & SF_SETGID)
        inode->i_gid = sbi->s_gid;
    else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
        inode->i_gid = 0;
    else
        inode->i_gid = id;

    switch (be32_to_cpu(tail->stype)) {
    case ST_ROOT:
        inode->i_uid = sbi->s_uid;
        inode->i_gid = sbi->s_gid;
    /* fall through */
    case ST_USERDIR:
        if (be32_to_cpu(tail->stype) == ST_USERDIR ||
                sbi->s_flags & SF_SETMODE) {
            if (inode->i_mode & S_IRUSR)
                inode->i_mode |= S_IXUSR;
            if (inode->i_mode & S_IRGRP)
                inode->i_mode |= S_IXGRP;
            if (inode->i_mode & S_IROTH)
                inode->i_mode |= S_IXOTH;
            inode->i_mode |= S_IFDIR;
        } else
            inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
        /* Maybe it should be controlled by mount parameter? */
        //inode->i_mode |= S_ISVTX;
        inode->i_op = &affs_dir_inode_operations;
        inode->i_fop = &affs_dir_operations;
        break;
    case ST_LINKDIR:
#if 0
        affs_warning(sb, "read_inode", "inode is LINKDIR");
        goto bad_inode;
#else
        inode->i_mode |= S_IFDIR;
        /* ... and leave ->i_op and ->i_fop pointing to empty */
        break;
#endif
    case ST_LINKFILE:
        affs_warning(sb, "read_inode", "inode is LINKFILE");
        goto bad_inode;
    case ST_FILE:
        size = be32_to_cpu(tail->size);
        inode->i_mode |= S_IFREG;
        AFFS_I(inode)->mmu_private = inode->i_size = size;
        if (inode->i_size) {
            AFFS_I(inode)->i_blkcnt = (size - 1) /
                                      sbi->s_data_blksize + 1;
            AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
                                      sbi->s_hashsize + 1;
        }
        if (tail->link_chain)
            inode->i_nlink = 2;
        inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
        inode->i_op = &affs_file_inode_operations;
        inode->i_fop = &affs_file_operations;
        break;
    case ST_SOFTLINK:
        inode->i_mode |= S_IFLNK;
        inode->i_op = &affs_symlink_inode_operations;
        inode->i_data.a_ops = &affs_symlink_aops;
        break;
    }

    inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
                            = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
                               be32_to_cpu(tail->change.mins) * 60 +
                               be32_to_cpu(tail->change.ticks) / 50 +
                               ((8 * 365 + 2) * 24 * 60 * 60)) +
                              sys_tz.tz_minuteswest * 60;
    inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
    affs_brelse(bh);
    unlock_new_inode(inode);
    return inode;

bad_inode:
    affs_brelse(bh);
    iget_failed(inode);
    return ERR_PTR(-EIO);
}
Esempio n. 3
0
int
affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct buffer_head	*bh;
	struct inode		*inode;
	char			*p;
	unsigned long		 tmp;
	int			 i, maxlen, error;
	char			 c, lc;

	pr_debug("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino,
		 (int)dentry->d_name.len,dentry->d_name.name,symname);
	
	maxlen = 4 * AFFS_I2HSIZE(dir) - 1;
	error = -ENOSPC;
	inode  = affs_new_inode(dir);
	if (!inode)
		goto out;

	inode->i_op   = &affs_symlink_inode_operations;
	inode->i_mode = S_IFLNK | 0777;
	inode->u.affs_i.i_protect = mode_to_prot(inode->i_mode);
	error = -EIO;
	bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
	if (!bh)
		goto out_iput;
	i  = 0;
	p  = ((struct slink_front *)bh->b_data)->symname;
	lc = '/';
	if (*symname == '/') {
		while (*symname == '/')
			symname++;
		while (inode->i_sb->u.affs_sb.s_volume[i])	/* Cannot overflow */
			*p++ = inode->i_sb->u.affs_sb.s_volume[i++];
	}
	while (i < maxlen && (c = *symname++)) {
		if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
			*p++ = '/';
			i++;
			symname += 2;
			lc = '/';
		} else if (c == '.' && lc == '/' && *symname == '/') {
			symname++;
			lc = '/';
		} else {
			*p++ = c;
			lc   = c;
			i++;
		}
		if (lc == '/')
			while (*symname == '/')
				symname++;
	}
	*p = 0;
	mark_buffer_dirty(bh,1);
	affs_brelse(bh);
	mark_inode_dirty(inode);

	/* N.B. This test shouldn't be necessary ... dentry must be negative */
	error = -EEXIST;
	bh = affs_find_entry(dir,dentry,&tmp);
	if (bh)
		goto out_release;
	/* N.B. Shouldn't we add the entry before dirtying the buffer? */
	error = affs_add_entry(dir,NULL,inode,dentry,ST_SOFTLINK);
	if (error)
		goto out_release;
	d_instantiate(dentry,inode);
	dir->i_version = ++event;
	mark_inode_dirty(dir);

out:
	return error;

out_release:
	affs_brelse(bh);
out_iput:
	inode->i_nlink = 0;
	mark_inode_dirty(inode);
	iput(inode);
	goto out;
}
Esempio n. 4
0
static struct super_block *
affs_read_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head	*root_bh = NULL;
	struct buffer_head	*boot_bh;
	struct inode		*root_inode = NULL;
	kdev_t			 dev = sb->s_dev;
	s32			 root_block;
	int			 blocks, size, blocksize;
	u32			 chksum;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	unsigned long		 mount_flags;

	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");

	sb->s_magic             = AFFS_SUPER_MAGIC;
	sb->s_op                = &affs_sops;
	memset(AFFS_SB, 0, sizeof(struct affs_sb_info));
	init_MUTEX(&AFFS_SB->s_bmlock);

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&AFFS_SB->s_prefix,
				AFFS_SB->s_volume, &mount_flags)) {
		printk(KERN_ERR "AFFS: Error parsing options\n");
		return NULL;
	}
	/* N.B. after this point s_prefix must be released */

	AFFS_SB->s_flags   = mount_flags;
	AFFS_SB->s_mode    = i;
	AFFS_SB->s_uid     = uid;
	AFFS_SB->s_gid     = gid;
	AFFS_SB->s_reserved= reserved;

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	blocks = blk_size[MAJOR(dev)] ? blk_size[MAJOR(dev)][MINOR(dev)] : 0;
	if (!blocks) {
		printk(KERN_ERR "AFFS: Could not determine device size\n");
		goto out_error;
	}
	size = (BLOCK_SIZE / 512) * blocks;
	pr_debug("AFFS: initial blksize=%d, blocks=%d\n", 512, blocks);

	affs_set_blocksize(sb, PAGE_SIZE);
	/* Try to find root block. Its location depends on the block size. */

	i = 512;
	j = 4096;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		AFFS_SB->s_root_block = root_block;
		if (root_block < 0)
			AFFS_SB->s_root_block = (reserved + size - 1) / 2;
		pr_debug("AFFS: setting blocksize to %d\n", blocksize);
		affs_set_blocksize(sb, blocksize);
		AFFS_SB->s_partition_size = size;

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
				"size=%d, reserved=%d\n",
				kdevname(dev),
				AFFS_SB->s_root_block + num_bm,
				blocksize, size, reserved);
			root_bh = affs_bread(sb, AFFS_SB->s_root_block + num_bm);
			if (!root_bh)
				continue;
			if (!affs_checksum_block(sb, root_bh) &&
			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
				AFFS_SB->s_hashsize    = blocksize / 4 - 56;
				AFFS_SB->s_root_block += num_bm;
				key                        = 1;
				goto got_root;
			}
			affs_brelse(root_bh);
			root_bh = NULL;
		}
	}
	if (!silent)
		printk(KERN_ERR "AFFS: No valid root block on device %s\n",
			kdevname(dev));
	goto out_error;

	/* N.B. after this point bh must be released */
got_root:
	root_block = AFFS_SB->s_root_block;

	sb->s_blocksize_bits = blocksize == 512 ? 9 :
			       blocksize == 1024 ? 10 :
			       blocksize == 2048 ? 11 : 12;

	/* Find out which kind of FS we have */
	boot_bh = bread(sb->s_dev, 0, sb->s_blocksize);
	if (!boot_bh) {
		printk(KERN_ERR "AFFS: Cannot read boot block\n");
		goto out_error;
	}
	chksum = be32_to_cpu(*(u32 *)boot_bh->b_data);
	brelse(boot_bh);

	/* Dircache filesystems are compatible with non-dircache ones
	 * when reading. As long as they aren't supported, writing is
	 * not recommended.
	 */
	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
	     || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
		printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
			kdevname(dev));
		sb->s_flags |= MS_RDONLY;
		AFFS_SB->s_flags |= SF_READONLY;
	}
	switch (chksum) {
		case MUFS_FS:
		case MUFS_INTLFFS:
		case MUFS_DCFFS:
			AFFS_SB->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_INTLFFS:
		case FS_DCFFS:
			AFFS_SB->s_flags |= SF_INTL;
			break;
		case MUFS_FFS:
			AFFS_SB->s_flags |= SF_MUFS;
			break;
		case FS_FFS:
			break;
		case MUFS_OFS:
			AFFS_SB->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_OFS:
			AFFS_SB->s_flags |= SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		case MUFS_DCOFS:
		case MUFS_INTLOFS:
			AFFS_SB->s_flags |= SF_MUFS;
		case FS_DCOFS:
		case FS_INTLOFS:
			AFFS_SB->s_flags |= SF_INTL | SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		default:
			printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
				kdevname(dev), chksum);
			goto out_error;
	}

	if (mount_flags & SF_VERBOSE) {
		chksum = cpu_to_be32(chksum);
		printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
			AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
			(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}

	sb->s_flags |= MS_NODEV | MS_NOSUID;

	AFFS_SB->s_data_blksize = sb->s_blocksize;
	if (AFFS_SB->s_flags & SF_OFS)
		AFFS_SB->s_data_blksize -= 24;

	/* Keep super block in cache */
	AFFS_SB->s_root_bh = root_bh;
	/* N.B. after this point s_root_bh must be released */

	if (affs_init_bitmap(sb))
		goto out_error;

	/* set up enough so that it can read an inode */

	root_inode = iget(sb, root_block);
	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root) {
		printk(KERN_ERR "AFFS: Get root inode failed\n");
		goto out_error;
	}
	sb->s_root->d_op = &affs_dentry_operations;

	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	return sb;

	/*
	 * Begin the cascaded cleanup ...
	 */
out_error:
	if (root_inode)
		iput(root_inode);
	if (AFFS_SB->s_bitmap)
		kfree(AFFS_SB->s_bitmap);
	affs_brelse(root_bh);
	if (AFFS_SB->s_prefix)
		kfree(AFFS_SB->s_prefix);
	return NULL;
}
Esempio n. 5
0
int
affs_add_entry(struct inode *dir, struct inode *link, struct inode *inode,
	       struct dentry *dentry, int type)
{
	struct buffer_head	*dir_bh;
	struct buffer_head	*inode_bh;
	struct buffer_head	*link_bh;
	int			 retval;
	const unsigned char	*name = dentry->d_name.name;
	int			 len  = dentry->d_name.len;

	pr_debug("AFFS: add_entry(dir=%lu,inode=%lu,\"%*s\",type=%d)\n",dir->i_ino,inode->i_ino,
		 len,name,type);

	if ((retval = affs_check_name(name,len)))
		return retval;
	if (len > 30)
		len = 30;

	dir_bh   = affs_bread(dir->i_dev,dir->i_ino,AFFS_I2BSIZE(dir));
	inode_bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
	link_bh  = NULL;
	retval   = -EIO;
	if (!dir_bh || !inode_bh)
		goto addentry_done;
	if (link) {
		link_bh = affs_bread(link->i_dev,link->i_ino,AFFS_I2BSIZE(link));
		if (!link_bh)
			goto addentry_done;
	}
	((struct dir_front *)inode_bh->b_data)->primary_type = cpu_to_be32(T_SHORT);
	((struct dir_front *)inode_bh->b_data)->own_key      = cpu_to_be32(inode->i_ino);
	DIR_END(inode_bh->b_data,inode)->dir_name[0]         = len;
	strncpy(DIR_END(inode_bh->b_data,inode)->dir_name + 1,name,len);
	DIR_END(inode_bh->b_data,inode)->secondary_type = cpu_to_be32(type);
	DIR_END(inode_bh->b_data,inode)->parent         = cpu_to_be32(dir->i_ino);

	lock_super(inode->i_sb);
	retval = affs_insert_hash(dir->i_ino,inode_bh,dir);

	if (link_bh) {
		LINK_END(inode_bh->b_data,inode)->original   = cpu_to_be32(link->i_ino);
		LINK_END(inode_bh->b_data,inode)->link_chain =
						FILE_END(link_bh->b_data,link)->link_chain;
		FILE_END(link_bh->b_data,link)->link_chain   = cpu_to_be32(inode->i_ino);
		affs_fix_checksum(AFFS_I2BSIZE(link),link_bh->b_data,5);
		link->i_version = ++global_event;
		mark_inode_dirty(link);
		mark_buffer_dirty(link_bh,1);
	}
	affs_fix_checksum(AFFS_I2BSIZE(inode),inode_bh->b_data,5);
	affs_fix_checksum(AFFS_I2BSIZE(dir),dir_bh->b_data,5);
	dir->i_version = ++global_event;
	dir->i_mtime   = dir->i_atime = dir->i_ctime = CURRENT_TIME;
	unlock_super(inode->i_sb);

	mark_inode_dirty(dir);
	mark_inode_dirty(inode);
	mark_buffer_dirty(dir_bh,1);
	mark_buffer_dirty(inode_bh,1);

addentry_done:
	affs_brelse(dir_bh);
	affs_brelse(inode_bh);
	affs_brelse(link_bh);

	return retval;
}
Esempio n. 6
0
int
affs_remove_header(struct dentry *dentry)
{
    struct super_block *sb;
    struct inode *inode, *dir;
    struct buffer_head *bh = NULL;
    int retval;

    dir = dentry->d_parent->d_inode;
    sb = dir->i_sb;

    retval = -ENOENT;
    inode = dentry->d_inode;
    if (!inode)
        goto done;

    pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
    retval = -EIO;
    bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
    if (!bh)
        goto done;

    affs_lock_link(inode);
    affs_lock_dir(dir);
    switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
    case ST_USERDIR:
        /* if we ever want to support links to dirs
         * i_hash_lock of the inode must only be
         * taken after some checks
         */
        affs_lock_dir(inode);
        retval = affs_empty_dir(inode);
        affs_unlock_dir(inode);
        if (retval)
            goto done_unlock;
        break;
    default:
        break;
    }

    retval = affs_remove_hash(dir, bh);
    if (retval)
        goto done_unlock;
    mark_buffer_dirty_inode(bh, inode);

    affs_unlock_dir(dir);

    if (inode->i_nlink > 1)
        retval = affs_remove_link(dentry);
    else
        inode->i_nlink = 0;
    affs_unlock_link(inode);
    inode->i_ctime = CURRENT_TIME_SEC;
    mark_inode_dirty(inode);

done:
    affs_brelse(bh);
    return retval;

done_unlock:
    affs_unlock_dir(dir);
    affs_unlock_link(inode);
    goto done;
}
Esempio n. 7
0
void
affs_truncate(struct inode *inode)
{
	struct buffer_head	*bh = NULL;
	int	 first;			/* First block to be thrown away	*/
	int	 block;
	s32	 key;
	s32	*keyp;
	s32	 ekey;
	s32	 ptype, stype;
	int	 freethis;
	int	 net_blocksize;
	int	 blocksize = AFFS_I2BSIZE(inode);
	int	 rem;
	int	 ext;

	pr_debug("AFFS: truncate(inode=%ld,size=%lu)\n",inode->i_ino,inode->i_size);

	net_blocksize = blocksize - ((inode->i_sb->u.affs_sb.s_flags & SF_OFS) ? 24 : 0);
	first = (inode->i_size + net_blocksize - 1) / net_blocksize;
	if (inode->u.affs_i.i_lastblock < first - 1) {
		/* There has to be at least one new block to be allocated */
		if (!inode->u.affs_i.i_ec && alloc_ext_cache(inode)) {
			/* XXX Fine! No way to indicate an error. */
			return /* -ENOSPC */;
		}
		bh = affs_getblock(inode,first - 1);
		if (!bh) {
			affs_warning(inode->i_sb,"truncate","Cannot extend file");
			inode->i_size = net_blocksize * (inode->u.affs_i.i_lastblock + 1);
		} else if (inode->i_sb->u.affs_sb.s_flags & SF_OFS) {
			rem = inode->i_size % net_blocksize;
			DATA_FRONT(bh)->data_size = cpu_to_be32(rem ? rem : net_blocksize);
			affs_fix_checksum(blocksize,bh->b_data,5);
			mark_buffer_dirty(bh,0);
		}
		goto out_truncate;
	}
	ekey = inode->i_ino;
	ext  = 0;

	/* Free all blocks starting at 'first' and all then-empty
	 * extension blocks. Do not free the header block, though.
	 */
	while (ekey) {
		if (!(bh = affs_bread(inode->i_dev,ekey,blocksize))) {
			affs_error(inode->i_sb,"truncate","Cannot read block %d",ekey);
			goto out_truncate;
		}
		if (affs_checksum_block(blocksize,bh->b_data,&ptype,&stype)) {
			affs_error(inode->i_sb,"truncate","Checksum error in header/ext block %d",
				   ekey);
			goto out_truncate;
		}
		if (stype != ST_FILE || (ptype != T_SHORT && ptype != T_LIST)) {
			affs_error(inode->i_sb,"truncate",
				   "Bad block (key=%d, ptype=%d, stype=%d)",ekey,ptype,stype);
			goto out_truncate;
		}
		/* Do we have to free this extension block after
		 * freeing the data blocks pointed to?
		 */
		freethis = first == 0 && ekey != inode->i_ino;

		/* Free the data blocks. 'first' is relative to this
		 * extension block and may well lie behind this block.
		 */
		for (block = first; block < AFFS_I2HSIZE(inode); block++) {
			keyp = &AFFS_BLOCK(bh->b_data,inode,block);
			key  = be32_to_cpu(*keyp);
			if (key) {
				*keyp = 0;
				affs_free_block(inode->i_sb,key);
			} else
				break;
		}
		keyp = &GET_END_PTR(struct file_end,bh->b_data,blocksize)->extension;
		key  = be32_to_cpu(*keyp);

		/* If 'first' is in this block or is the first
		 * in the next one, this will be the last in
		 * the list, thus we have to adjust the count
		 * and zero the pointer to the next ext block.
		 */
		if (first <= AFFS_I2HSIZE(inode)) {
			((struct file_front *)bh->b_data)->block_count = cpu_to_be32(first);
			first = 0;
			*keyp = 0;
			affs_fix_checksum(blocksize,bh->b_data,5);
			mark_buffer_dirty(bh,1);
		} else
			first -= AFFS_I2HSIZE(inode);
		affs_brelse(bh);
		bh = NULL;
		if (freethis)			/* Don't bother fixing checksum */
			affs_free_block(inode->i_sb,ekey);
		ekey = key;
	}
	block = ((inode->i_size + net_blocksize - 1) / net_blocksize) - 1;
	inode->u.affs_i.i_lastblock = block;

	/* If the file is not truncated to a block boundary,
	 * the partial block after the EOF must be zeroed
	 * so it cannot become accessible again.
	 */

	rem = inode->i_size % net_blocksize;
	if (rem) {
		if ((inode->i_sb->u.affs_sb.s_flags & SF_OFS)) 
			rem += 24;
		pr_debug("AFFS: Zeroing from offset %d in block %d\n",rem,block);
		bh = affs_getblock(inode,block);
		if (bh) {
			memset(bh->b_data + rem,0,blocksize - rem);
			if ((inode->i_sb->u.affs_sb.s_flags & SF_OFS)) {
				((struct data_front *)bh->b_data)->data_size = cpu_to_be32(rem);
				((struct data_front *)bh->b_data)->next_data = 0;
				affs_fix_checksum(blocksize,bh->b_data,5);
			}
			mark_buffer_dirty(bh,1);
		} else 
			affs_error(inode->i_sb,"truncate","Cannot read block %d",block);
	}

out_truncate:
	affs_brelse(bh);
	/* Invalidate cache */
	if (inode->u.affs_i.i_ec) {
		inode->u.affs_i.i_ec->max_ext = 0;
		for (key = 0; key < 3; key++) {
			inode->u.affs_i.i_ec->kc[key].kc_next_key = 0;
			inode->u.affs_i.i_ec->kc[key].kc_last     = -1;
		}
	}
	mark_inode_dirty(inode);
}
Esempio n. 8
0
static int
affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct inode		*inode = filp->f_path.dentry->d_inode;
	struct super_block	*sb = inode->i_sb;
	struct buffer_head	*dir_bh;
	struct buffer_head	*fh_bh;
	unsigned char		*name;
	int			 namelen;
	u32			 i;
	int			 hash_pos;
	int			 chain_pos;
	u32			 f_pos;
	u32			 ino;
	int			 stored;
	int			 res;

	pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);

	stored = 0;
	res    = -EIO;
	dir_bh = NULL;
	fh_bh  = NULL;
	f_pos  = filp->f_pos;

	if (f_pos == 0) {
		filp->private_data = (void *)0;
		if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
			return 0;
		filp->f_pos = f_pos = 1;
		stored++;
	}
	if (f_pos == 1) {
		if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_path.dentry), DT_DIR) < 0)
			return stored;
		filp->f_pos = f_pos = 2;
		stored++;
	}

	affs_lock_dir(inode);
	chain_pos = (f_pos - 2) & 0xffff;
	hash_pos  = (f_pos - 2) >> 16;
	if (chain_pos == 0xffff) {
		affs_warning(sb, "readdir", "More than 65535 entries in chain");
		chain_pos = 0;
		hash_pos++;
		filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
	}
	dir_bh = affs_bread(sb, inode->i_ino);
	if (!dir_bh)
		goto readdir_out;

	ino = (u32)(long)filp->private_data;
	if (ino && filp->f_version == inode->i_version) {
		pr_debug("AFFS: readdir() left off=%d\n", ino);
		goto inside;
	}

	ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
	for (i = 0; ino && i < chain_pos; i++) {
		fh_bh = affs_bread(sb, ino);
		if (!fh_bh) {
			affs_error(sb, "readdir","Cannot read block %d", i);
			goto readdir_out;
		}
		ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
		affs_brelse(fh_bh);
		fh_bh = NULL;
	}
	if (ino)
		goto inside;
	hash_pos++;

	for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
		ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
		if (!ino)
			continue;
		f_pos = (hash_pos << 16) + 2;
inside:
		do {
			fh_bh = affs_bread(sb, ino);
			if (!fh_bh) {
				affs_error(sb, "readdir","Cannot read block %d", ino);
				goto readdir_done;
			}

			namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
			name = AFFS_TAIL(sb, fh_bh)->name + 1;
			pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
				 namelen, name, ino, hash_pos, f_pos);
			if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
				goto readdir_done;
			stored++;
			f_pos++;
			ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
			affs_brelse(fh_bh);
			fh_bh = NULL;
		} while (ino);
	}
readdir_done:
	filp->f_pos = f_pos;
	filp->f_version = inode->i_version;
	filp->private_data = (void *)(long)ino;
	res = stored;

readdir_out:
	affs_brelse(dir_bh);
	affs_brelse(fh_bh);
	affs_unlock_dir(inode);
	pr_debug("AFFS: readdir()=%d\n", stored);
	return res;
}
Esempio n. 9
0
static int
affs_bmap(struct inode *inode, int block)
{
	struct buffer_head	*bh;
	s32			 key, nkey;
	s32			 ptype, stype;
	int			 ext;
	int			 index;
	int			 keycount;
	struct key_cache	*kc;
	struct key_cache	*tkc;
	struct timeval		 tv;
	s32			*keyp;
	int			 i;

	pr_debug("AFFS: bmap(%lu,%d)\n",inode->i_ino,block);

	if (block < 0) {
		affs_error(inode->i_sb,"bmap","Block < 0");
		return 0;
	}
	if (!inode->u.affs_i.i_ec) {
		if (alloc_ext_cache(inode)) {
			return 0;
		}
	}

	/* Try to find the requested key in the cache.
	 * In order to speed this up as much as possible,
	 * the cache line lookup is done in a separate
	 * step.
	 */

	for (i = 0; i < 4; i++) {
		tkc = &inode->u.affs_i.i_ec->kc[i];
		/* Look in any cache if the key is there */
		if (block <= tkc->kc_last && block >= tkc->kc_first) {
			return tkc->kc_keys[block - tkc->kc_first];
		}
	}
	kc = NULL;
#ifdef OSKIT
	tv.tv_sec  = CURRENT_TIME;
	tv.tv_usec = 0;
#else
	tv = xtime;
#endif
	for (i = 0; i < 4; i++) {
		tkc = &inode->u.affs_i.i_ec->kc[i];
		if (tkc->kc_lru_time.tv_sec > tv.tv_sec)
			continue;
		if (tkc->kc_lru_time.tv_sec < tv.tv_sec ||
		    tkc->kc_lru_time.tv_usec < tv.tv_usec) {
			kc = tkc;
			tv = tkc->kc_lru_time;
		}
	}
	if (!kc)	/* Really shouldn't happen */
		kc = tkc;
#ifdef OSKIT
	kc->kc_lru_time.tv_sec  = CURRENT_TIME;
	kc->kc_lru_time.tv_usec = 0;
#else
	kc->kc_lru_time = xtime;
#endif
	keyp            = kc->kc_keys;
	kc->kc_first    = block;
	kc->kc_last     = -1;
	keycount        = AFFS_KCSIZE;

	/* Calculate sequence number of the extension block where the
	 * number of the requested block is stored. 0 means it's in
	 * the file header.
	 */

	ext    = block / AFFS_I2HSIZE(inode);
	key    = calc_key(inode,&ext);
	block -= ext * AFFS_I2HSIZE(inode);

	for (;;) {
		bh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
		if (!bh) 
			return 0;
		index = seqnum_to_index(ext);
		if (index > inode->u.affs_i.i_ec->max_ext &&
		    (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&ptype,&stype) ||
		     (ptype != T_SHORT && ptype != T_LIST) || stype != ST_FILE)) {
			affs_brelse(bh);
			return 0;
		}
		nkey = be32_to_cpu(FILE_END(bh->b_data,inode)->extension);
		if (block < AFFS_I2HSIZE(inode)) {
			/* Fill cache as much as possible */
			if (keycount) {
				kc->kc_first = ext * AFFS_I2HSIZE(inode) + block;
				keycount     = keycount < AFFS_I2HSIZE(inode) - block ? keycount :
						AFFS_I2HSIZE(inode) - block;
				for (i = 0; i < keycount; i++)
					kc->kc_keys[i] = be32_to_cpu(AFFS_BLOCK(bh->b_data,inode,block + i));
				kc->kc_last = kc->kc_first + i - 1;
			}
			break;
		}
		block -= AFFS_I2HSIZE(inode);
		affs_brelse(bh);
		ext++;
		if (index > inode->u.affs_i.i_ec->max_ext && AFFS_ISINDEX(ext)) {
			inode->u.affs_i.i_ec->ec[index] = nkey;
			inode->u.affs_i.i_ec->max_ext   = index;
		}
		key = nkey;
	}
	kc->kc_this_key = key;
	kc->kc_this_seq = ext;
	kc->kc_next_key = nkey;
	key = be32_to_cpu(AFFS_BLOCK(bh->b_data,inode,block));
	affs_brelse(bh);
	return key;
}
Esempio n. 10
0
static struct buffer_head *
affs_getblock(struct inode *inode, s32 block)
{
	struct super_block	*sb = inode->i_sb;
	int			 ofs = sb->u.affs_sb.s_flags & SF_OFS;
	int			 ext = block / AFFS_I2HSIZE(inode);
	struct buffer_head	*bh, *ebh, *pbh = NULL;
	struct key_cache	*kc;
	s32			 key, nkey;
	int			 cf, j, pt;
	int			 index;
	int			 err;

	pr_debug("AFFS: getblock(%lu,%d)\n",inode->i_ino,block);

	if (block < 0)
		goto out_fail;

	key    = calc_key(inode,&ext);
	block -= ext * AFFS_I2HSIZE(inode);
	pt     = ext ? T_LIST : T_SHORT;

	/* Key refers now to the last known extension block,
	 * ext is its sequence number (if 0, key refers to the
	 * header block), and block is the block number relative
	 * to the first block stored in that extension block.
	 */
	for (;;) {	/* Loop over header block and extension blocks */
		struct file_front *fdp;

		bh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
		if (!bh)
			goto out_fail;
		fdp = (struct file_front *) bh->b_data;
		err = affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&cf,&j);
		if (err || cf != pt || j != ST_FILE) {
		    	affs_error(sb, "getblock",
				"Block %d is not a valid %s", key,
				pt == T_SHORT ? "file header" : "ext block");
			goto out_free_bh;
		}
		j  = be32_to_cpu(((struct file_front *)bh->b_data)->block_count);
		for (cf = 0; j < AFFS_I2HSIZE(inode) && j <= block; j++) {
			if (ofs && !pbh && inode->u.affs_i.i_lastblock >= 0) {
				if (j > 0) {
					s32 k = AFFS_BLOCK(bh->b_data, inode,
								j - 1);
					pbh = affs_bread(inode->i_dev,
							be32_to_cpu(k),
							AFFS_I2BSIZE(inode));
				} else
					pbh = affs_getblock(inode,inode->u.affs_i.i_lastblock);
				if (!pbh) {
					affs_error(sb,"getblock",
						"Cannot get last block in file");
					break;
				}
			}
			nkey = affs_new_data(inode);
			if (!nkey)
				break;
			inode->u.affs_i.i_lastblock++;
			if (AFFS_BLOCK(bh->b_data,inode,j)) {
				affs_warning(sb,"getblock","Block already allocated");
				affs_free_block(sb,nkey);
				continue;
			}
			AFFS_BLOCK(bh->b_data,inode,j) = cpu_to_be32(nkey);
			if (ofs) {
				ebh = affs_bread(inode->i_dev,nkey,AFFS_I2BSIZE(inode));
				if (!ebh) {
					affs_error(sb,"getblock",
						   "Cannot get block %d",nkey);
					affs_free_block(sb,nkey);
					AFFS_BLOCK(bh->b_data,inode,j) = 0;
					break;
				}
				DATA_FRONT(ebh)->primary_type    = cpu_to_be32(T_DATA);
				DATA_FRONT(ebh)->header_key      = cpu_to_be32(inode->i_ino);
				DATA_FRONT(ebh)->sequence_number = cpu_to_be32(inode->u.affs_i.i_lastblock + 1);
				affs_fix_checksum(AFFS_I2BSIZE(inode),
							ebh->b_data, 5);
				mark_buffer_dirty(ebh, 0);
				if (pbh) {
					DATA_FRONT(pbh)->data_size = cpu_to_be32(AFFS_I2BSIZE(inode) - 24);
					DATA_FRONT(pbh)->next_data = cpu_to_be32(nkey);
					affs_fix_checksum(AFFS_I2BSIZE(inode),pbh->b_data,5);
					mark_buffer_dirty(pbh,0);
					affs_brelse(pbh);
				}
				pbh = ebh;
			}
			cf = 1;
		}
		/* N.B. May need to release pbh after here */

		if (cf) {
			if (pt == T_SHORT)
				fdp->first_data = AFFS_BLOCK(bh->b_data,inode,0);
			fdp->block_count = cpu_to_be32(j);
			affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
			mark_buffer_dirty(bh,1);
		}

		if (block < j) {
			if (pbh)
				affs_brelse(pbh);
			break;
		}
		if (j < AFFS_I2HSIZE(inode)) {
			/* N.B. What about pbh here? */
			goto out_free_bh;
		}

		block -= AFFS_I2HSIZE(inode);
		key    = be32_to_cpu(FILE_END(bh->b_data,inode)->extension);
		if (!key) {
			key = affs_new_header(inode);
			if (!key)
				goto out_free_bh;
			ebh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
			if (!ebh) {
				/* N.B. must free bh here */
				goto out_free_block;
			}
			((struct file_front *)ebh->b_data)->primary_type = cpu_to_be32(T_LIST);
			((struct file_front *)ebh->b_data)->own_key      = cpu_to_be32(key);
			FILE_END(ebh->b_data,inode)->secondary_type      = cpu_to_be32(ST_FILE);
			FILE_END(ebh->b_data,inode)->parent              = cpu_to_be32(inode->i_ino);
			affs_fix_checksum(AFFS_I2BSIZE(inode),ebh->b_data,5);
			mark_buffer_dirty(ebh, 1);
			FILE_END(bh->b_data,inode)->extension = cpu_to_be32(key);
			affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
			mark_buffer_dirty(bh,1);
			affs_brelse(bh);
			bh = ebh;
		}
		pt = T_LIST;
		ext++;
		index = seqnum_to_index(ext);
		if (index > inode->u.affs_i.i_ec->max_ext &&
		    AFFS_ISINDEX(ext)) {
			inode->u.affs_i.i_ec->ec[index] = key;
			inode->u.affs_i.i_ec->max_ext   = index;
		}
		affs_brelse(bh);
	}

	/* Invalidate key cache */
	for (j = 0; j < 4; j++) {
		kc = &inode->u.affs_i.i_ec->kc[j];
		kc->kc_last = -1;
	}
	key = be32_to_cpu(AFFS_BLOCK(bh->b_data,inode,block));
	affs_brelse(bh);
	if (!key)
		goto out_fail;

	bh = affs_bread(inode->i_dev, key, AFFS_I2BSIZE(inode));
	return bh;

out_free_block:
	affs_free_block(sb, key);
out_free_bh:
	affs_brelse(bh);
out_fail:
	return NULL;
}
Esempio n. 11
0
static struct super_block *
affs_read_super(struct super_block *s, void *data, int silent)
{
	struct buffer_head	*bh = NULL;
	struct buffer_head	*bb;
	struct inode		*root_inode;
	kdev_t			 dev = s->s_dev;
	s32			 root_block;
	int			 blocks, size, blocksize;
	u32			 chksum;
	u32			*bm;
	s32			 ptype, stype;
	int			 mapidx;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	int			 az_no;
	int			 bmalt = 0;
	unsigned long		 mount_flags;
	unsigned long		 offset;

	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");

	MOD_INC_USE_COUNT;
	lock_super(s);
	s->s_magic             = AFFS_SUPER_MAGIC;
	s->s_op                = &affs_sops;
	s->u.affs_sb.s_bitmap  = NULL;
	s->u.affs_sb.s_root_bh = NULL;
	s->u.affs_sb.s_prefix  = NULL;
	s->u.affs_sb.s_hashsize= 0;

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&s->u.affs_sb.s_prefix,
				s->u.affs_sb.s_volume, &mount_flags))
		goto out_bad_opts;
	/* N.B. after this point s_prefix must be released */

	s->u.affs_sb.s_flags   = mount_flags;
	s->u.affs_sb.s_mode    = i;
	s->u.affs_sb.s_uid     = uid;
	s->u.affs_sb.s_gid     = gid;
	s->u.affs_sb.s_reserved= reserved;

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	blocks = blk_size[MAJOR(dev)][MINOR(dev)];
	if (blocks == 0)
		goto out_bad_size;
	s->u.affs_sb.s_blksize = blksize_size[MAJOR(dev)][MINOR(dev)];
	if (!s->u.affs_sb.s_blksize)
		s->u.affs_sb.s_blksize = BLOCK_SIZE;
	size = (s->u.affs_sb.s_blksize / 512) * blocks;
	pr_debug("AFFS: initial blksize=%d, blocks=%d\n",
		s->u.affs_sb.s_blksize, blocks);

	/* Try to find root block. Its location depends on the block size. */

	i = 512;
	j = 4096;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		s->u.affs_sb.s_root_block = root_block;
		if (root_block < 0)
			s->u.affs_sb.s_root_block = (reserved + size - 1) / 2;
		pr_debug("AFFS: setting blocksize to %d\n", blocksize);
		set_blocksize(dev, blocksize);

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
				"size=%d, reserved=%d\n",
				kdevname(dev),
				s->u.affs_sb.s_root_block + num_bm,
				blocksize, size, reserved);
			bh = affs_bread(dev, s->u.affs_sb.s_root_block + num_bm,
					blocksize);
			if (!bh)
				continue;
			if (!affs_checksum_block(blocksize,bh->b_data,&ptype,&stype) &&
			    ptype == T_SHORT && stype == ST_ROOT) {
				s->s_blocksize             = blocksize;
				s->u.affs_sb.s_hashsize    = blocksize / 4 - 56;
				s->u.affs_sb.s_root_block += num_bm;
				key                        = 1;
				goto got_root;
			}
			affs_brelse(bh);
			bh = NULL;
		}
	}
	goto out_no_valid_block;

	/* N.B. after this point bh must be released */
got_root:
	root_block = s->u.affs_sb.s_root_block;

	s->u.affs_sb.s_partition_size   = size;
	s->s_blocksize_bits             = blocksize == 512 ? 9 :
					  blocksize == 1024 ? 10 :
					  blocksize == 2048 ? 11 : 12;

	/* Find out which kind of FS we have */
	bb = affs_bread(dev,0,s->s_blocksize);
	if (!bb)
		goto out_no_root_block;
	chksum = be32_to_cpu(*(u32 *)bb->b_data);
	affs_brelse(bb);

	/* Dircache filesystems are compatible with non-dircache ones
	 * when reading. As long as they aren't supported, writing is
	 * not recommended.
	 */
	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
	     || chksum == MUFS_DCOFS) && !(s->s_flags & MS_RDONLY)) {
		printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
			kdevname(dev));
		s->s_flags |= MS_RDONLY;
		s->u.affs_sb.s_flags |= SF_READONLY;
	}
	switch (chksum) {
		case MUFS_FS:
		case MUFS_INTLFFS:
			s->u.affs_sb.s_flags |= SF_MUFS;
			/* fall thru */
		case FS_INTLFFS:
			s->u.affs_sb.s_flags |= SF_INTL;
			break;
		case MUFS_DCFFS:
		case MUFS_FFS:
			s->u.affs_sb.s_flags |= SF_MUFS;
			break;
		case FS_DCFFS:
		case FS_FFS:
			break;
		case MUFS_OFS:
			s->u.affs_sb.s_flags |= SF_MUFS;
			/* fall thru */
		case FS_OFS:
			s->u.affs_sb.s_flags |= SF_OFS;
			s->s_flags |= MS_NOEXEC;
			break;
		case MUFS_DCOFS:
		case MUFS_INTLOFS:
			s->u.affs_sb.s_flags |= SF_MUFS;
		case FS_DCOFS:
		case FS_INTLOFS:
			s->u.affs_sb.s_flags |= SF_INTL | SF_OFS;
			s->s_flags |= MS_NOEXEC;
			break;
		default:
			goto out_unknown_fs;
	}

	if (mount_flags & SF_VERBOSE) {
		chksum = cpu_to_be32(chksum);
		printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
			GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[0],
			&GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[1],
			(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}
Esempio n. 12
0
		default:
			goto out_unknown_fs;
	}

	if (mount_flags & SF_VERBOSE) {
		chksum = cpu_to_be32(chksum);
		printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
			GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[0],
			&GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[1],
			(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}

	s->s_flags |= MS_NODEV | MS_NOSUID;

	/* Keep super block in cache */
	bb = affs_bread(dev,root_block,s->s_blocksize);
	if (!bb)
		goto out_no_root_block;
	s->u.affs_sb.s_root_bh = bb;
	/* N.B. after this point s_root_bh must be released */

	/* Allocate space for bitmaps, zones and others */

	size   = s->u.affs_sb.s_partition_size - reserved;
	num_bm = (size + s->s_blocksize * 8 - 32 - 1) / (s->s_blocksize * 8 - 32);
	az_no  = (size + AFFS_ZONE_SIZE - 1) / (AFFS_ZONE_SIZE - 32);
	ptype  = num_bm * sizeof(struct affs_bm_info) +
		 az_no * sizeof(struct affs_alloc_zone) +
		 MAX_ZONES * sizeof(struct affs_zone);
	pr_debug("AFFS: num_bm=%d, az_no=%d, sum=%d\n",num_bm,az_no,ptype);
	if (!(s->u.affs_sb.s_bitmap = kmalloc(ptype, GFP_KERNEL)))
Esempio n. 13
0
void
affs_read_inode(struct inode *inode)
{
	struct buffer_head	*bh;
	struct file_front	*file_front;
	struct file_end		*file_end;
	s32			 block;
	unsigned long		 prot;
	s32			 ptype, stype;
	unsigned short		 id;

	pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);

	block = inode->i_ino;
	if (!(bh = affs_bread(inode->i_dev,block,AFFS_I2BSIZE(inode)))) {
		affs_error(inode->i_sb,"read_inode","Cannot read block %d",block);
		return;
	}
	if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&ptype,&stype) || ptype != T_SHORT) {
		affs_error(inode->i_sb,"read_inode",
			   "Checksum or type (ptype=%d) error on inode %d",ptype,block);
		affs_brelse(bh);
		return;
	}

	file_front = (struct file_front *)bh->b_data;
	file_end   = GET_END_PTR(struct file_end, bh->b_data,AFFS_I2BSIZE(inode));
	prot       = (be32_to_cpu(file_end->protect) & ~0x10) ^ FIBF_OWNER;

	inode->u.affs_i.i_protect      = prot;
	inode->u.affs_i.i_parent       = be32_to_cpu(file_end->parent);
	inode->u.affs_i.i_original     = 0;
	inode->u.affs_i.i_zone         = 0;
	inode->u.affs_i.i_hlink        = 0;
	inode->u.affs_i.i_pa_cnt       = 0;
	inode->u.affs_i.i_pa_next      = 0;
	inode->u.affs_i.i_pa_last      = 0;
	inode->u.affs_i.i_ec           = NULL;
	inode->u.affs_i.i_lastblock    = -1;
	inode->i_nlink                 = 1;
	inode->i_mode                  = 0;

	if (inode->i_sb->u.affs_sb.s_flags & SF_SETMODE)
		inode->i_mode = inode->i_sb->u.affs_sb.s_mode;
	else
		inode->i_mode = prot_to_mode(prot);

	if (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
		inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
	id = be16_to_cpu(file_end->owner_uid);
	if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETUID)
		inode->i_uid = inode->i_sb->u.affs_sb.s_uid;
	else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
		inode->i_uid = 0;
	else 
		inode->i_uid = id;

	id = be16_to_cpu(file_end->owner_gid);
	if (id == 0 || inode->i_sb->u.affs_sb.s_flags & SF_SETGID)
		inode->i_gid = inode->i_sb->u.affs_sb.s_gid;
	else if (id == 0xFFFF && inode->i_sb->u.affs_sb.s_flags & SF_MUFS)
		inode->i_gid = 0;
	else
		inode->i_gid = id;

	switch (be32_to_cpu(file_end->secondary_type)) {
		case ST_ROOT:
			inode->i_uid   = inode->i_sb->u.affs_sb.s_uid;
			inode->i_gid   = inode->i_sb->u.affs_sb.s_gid;
		case ST_USERDIR:
			if (be32_to_cpu(file_end->secondary_type) == ST_USERDIR ||
			    inode->i_sb->u.affs_sb.s_flags & SF_SETMODE) {
				if (inode->i_mode & S_IRUSR)
					inode->i_mode |= S_IXUSR;
				if (inode->i_mode & S_IRGRP)
					inode->i_mode |= S_IXGRP;
				if (inode->i_mode & S_IROTH)
					inode->i_mode |= S_IXOTH;
				inode->i_mode |= S_IFDIR;
			} else
				inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
			inode->i_size  = 0;
			break;
		case ST_LINKDIR:
			affs_error(inode->i_sb,"read_inode","inode is LINKDIR");
			affs_brelse(bh);
			return;
		case ST_LINKFILE:
			affs_error(inode->i_sb,"read_inode","inode is LINKFILE");
			affs_brelse(bh);
			return;
		case ST_FILE:
			inode->i_mode |= S_IFREG;
			inode->i_size  = be32_to_cpu(file_end->byte_size);
			if (inode->i_sb->u.affs_sb.s_flags & SF_OFS)
				block = AFFS_I2BSIZE(inode) - 24;
			else
				block = AFFS_I2BSIZE(inode);
			inode->u.affs_i.i_lastblock = ((inode->i_size + block - 1) / block) - 1;
			break;
		case ST_SOFTLINK:
			inode->i_mode |= S_IFLNK;
			inode->i_size  = 0;
			break;
	}

	inode->i_mtime = inode->i_atime = inode->i_ctime
		       = (be32_to_cpu(file_end->created.ds_Days) * (24 * 60 * 60) +
		         be32_to_cpu(file_end->created.ds_Minute) * 60 +
			 be32_to_cpu(file_end->created.ds_Tick) / 50 +
			 ((8 * 365 + 2) * 24 * 60 * 60)) +
			 sys_tz.tz_minuteswest * 60;
	affs_brelse(bh);

	inode->i_op = NULL;
	if (S_ISREG(inode->i_mode)) {
		if (inode->i_sb->u.affs_sb.s_flags & SF_OFS) {
			inode->i_op = &affs_file_inode_operations_ofs;
		} else {
			inode->i_op = &affs_file_inode_operations;
		}
	} else if (S_ISDIR(inode->i_mode)) {
		/* Maybe it should be controlled by mount parameter? */
		inode->i_mode |= S_ISVTX;
		inode->i_op = &affs_dir_inode_operations;
	}
	else if (S_ISLNK(inode->i_mode))
		inode->i_op = &affs_symlink_inode_operations;
}
Esempio n. 14
0
int
affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
{
    struct super_block *sb = dir->i_sb;
    struct buffer_head *inode_bh = NULL;
    struct buffer_head *bh = NULL;
    u32 block = 0;
    int retval;

    pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
             (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);

    retval = -EIO;
    bh = affs_bread(sb, inode->i_ino);
    if (!bh)
        goto done;

    affs_lock_link(inode);
    switch (type) {
    case ST_LINKFILE:
    case ST_LINKDIR:
        retval = -ENOSPC;
        block = affs_alloc_block(dir, dir->i_ino);
        if (!block)
            goto err;
        retval = -EIO;
        inode_bh = bh;
        bh = affs_getzeroblk(sb, block);
        if (!bh)
            goto err;
        break;
    default:
        break;
    }

    AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
    AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
    affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
    AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
    AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);

    if (inode_bh) {
        __be32 chain;
        chain = AFFS_TAIL(sb, inode_bh)->link_chain;
        AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
        AFFS_TAIL(sb, bh)->link_chain = chain;
        AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
        affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
        mark_buffer_dirty_inode(inode_bh, inode);
        inode->i_nlink = 2;
        atomic_inc(&inode->i_count);
    }
    affs_fix_checksum(sb, bh);
    mark_buffer_dirty_inode(bh, inode);
    dentry->d_fsdata = (void *)(long)bh->b_blocknr;

    affs_lock_dir(dir);
    retval = affs_insert_hash(dir, bh);
    mark_buffer_dirty_inode(bh, inode);
    affs_unlock_dir(dir);
    affs_unlock_link(inode);

    d_instantiate(dentry, inode);
done:
    affs_brelse(inode_bh);
    affs_brelse(bh);
    return retval;
err:
    if (block)
        affs_free_block(sb, block);
    affs_unlock_link(inode);
    goto done;
}
Esempio n. 15
0
struct super_block *
affs_read_super(struct super_block *s,void *data, int silent)
{
	struct buffer_head	*bh = NULL;
	struct buffer_head	*bb;
	kdev_t			 dev = s->s_dev;
	int			 root_block;
	int			 size;
	__u32			 chksum;
	__u32			*bm;
	int			 ptype, stype;
	int			 mapidx;
	int			 num_bm;
	int			 i, j;
	int			 key;
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	int			 az_no;
	unsigned long		 mount_flags;
	unsigned long		 offset;

	pr_debug("affs_read_super(%s)\n",data ? (const char *)data : "no options");

	MOD_INC_USE_COUNT;

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	    &blocksize,&s->u.affs_sb.s_prefix,s->u.affs_sb.s_volume,&mount_flags)) {
		s->s_dev = 0;
		printk("AFFS: error parsing options.\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	lock_super(s);

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = blksize_size[MAJOR(dev)][MINOR(dev)];
	size = (size ? size : BLOCK_SIZE) / 512 * blk_size[MAJOR(dev)][MINOR(dev)];

	s->u.affs_sb.s_bitmap  = NULL;
	s->u.affs_sb.s_root_bh = NULL;
	s->u.affs_sb.s_flags   = mount_flags;
	s->u.affs_sb.s_mode    = i;
	s->u.affs_sb.s_uid     = uid;
	s->u.affs_sb.s_gid     = gid;

	if (size == 0) {
		s->s_dev = 0;
		unlock_super(s);
		printk("affs_read_super: could not determine device size\n");
		goto out;
	}
	s->u.affs_sb.s_partition_size = size;
	s->u.affs_sb.s_reserved       = reserved;

	/* Try to find root block. Its location may depend on the block size. */

	s->u.affs_sb.s_hashsize = 0;
	if (blocksize > 0) {
		i = blocksize;
		j = blocksize;
	} else {
		i = 512;
		j = 4096;
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		if (root_block < 0)
			s->u.affs_sb.s_root_block = (reserved + size - 1) / 2;
		else
			s->u.affs_sb.s_root_block = root_block;
		set_blocksize(dev,blocksize);

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s - trying bs=%d bytes, root at %d, "
				 "size=%d blocks, %d reserved\n",kdevname(dev),blocksize,
				 s->u.affs_sb.s_root_block + num_bm,size,reserved);
			bh = affs_bread(dev,s->u.affs_sb.s_root_block + num_bm,blocksize);
			if (!bh) {
				printk("AFFS: unable to read root block\n");
				goto out;
			}
			if (!affs_checksum_block(blocksize,bh->b_data,&ptype,&stype) &&
			    ptype == T_SHORT && stype == ST_ROOT) {
				s->s_blocksize             = blocksize;
				s->u.affs_sb.s_hashsize    = blocksize / 4 - 56;
				s->u.affs_sb.s_root_block += num_bm;
				key                        = 1;
				break;
			}
		}
		if (key)
			break;
		affs_brelse(bh);
		bh = NULL;
	}
	if (!key) {
		affs_brelse(bh);
		if (!silent)
			printk("AFFS: Can't find a valid root block on device %s\n",kdevname(dev));
		goto out;
	}
	root_block = s->u.affs_sb.s_root_block;

	s->u.affs_sb.s_partition_size   = size;
	s->s_blocksize_bits             = blocksize == 512 ? 9 :
					  blocksize == 1024 ? 10 :
					  blocksize == 2048 ? 11 : 12;

	/* Find out which kind of FS we have */
	bb = affs_bread(dev,0,s->s_blocksize);
	if (bb) {
		chksum = htonl(*(__u32 *)bb->b_data);
		switch (chksum) {
			case MUFS_FS:
			case MUFS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_INTL;
				break;
			case MUFS_DCFFS:
			case MUFS_FFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				break;
			case FS_DCFFS:
			case FS_FFS:
				break;
			case MUFS_OFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_OFS:
				s->u.affs_sb.s_flags |= SF_OFS;
				break;
			case MUFS_DCOFS:
				if (!(s->s_flags & MS_RDONLY)) {
					printk("AFFS: Dircache FS - mounting %s read only.\n",
					       kdevname(dev));
				}
				/* fall thru */
			case MUFS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				if (0)
				/* fall thru */
			case FS_DCOFS:
				if (!(s->s_flags & MS_RDONLY)) {
					printk("AFFS: Dircache FS - mounting %s read only.\n",
					       kdevname(dev));
				}
				/* fall thru */
			case FS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_INTL | SF_OFS;
				break;
			default:
				printk("AFFS: Unknown filesystem on device %s: %08X\n",
				       kdevname(dev),chksum);
				affs_brelse(bb);
				goto out;
		}
		affs_brelse(bb);
	} else {
		printk("AFFS: Can't get boot block.\n");
		goto out;
	}
	if (mount_flags & SF_VERBOSE) {
		chksum = ntohl(chksum);
		printk("AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
		       GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[0],
		       &GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[1],
		       (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}
Esempio n. 16
0
static int affs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct affs_sb_info	*sbi;
	struct buffer_head	*root_bh = NULL;
	struct buffer_head	*boot_bh;
	struct inode		*root_inode = NULL;
	s32			 root_block;
	int			 size, blocksize;
	u32			 chksum;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	kuid_t			 uid;
	kgid_t			 gid;
	int			 reserved;
	unsigned long		 mount_flags;
	int			 tmp_flags;	/* fix remount prototype... */
	u8			 sig[4];
	int			 ret;

	save_mount_options(sb, data);

	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");

	sb->s_magic             = AFFS_SUPER_MAGIC;
	sb->s_op                = &affs_sops;
	sb->s_flags |= MS_NODIRATIME;

	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	sb->s_fs_info = sbi;
	sbi->sb = sb;
	mutex_init(&sbi->s_bmlock);
	spin_lock_init(&sbi->symlink_lock);
	spin_lock_init(&sbi->work_lock);
	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&sbi->s_prefix,
				sbi->s_volume, &mount_flags)) {
		printk(KERN_ERR "AFFS: Error parsing options\n");
		kfree(sbi->s_prefix);
		kfree(sbi);
		return -EINVAL;
	}
	/* N.B. after this point s_prefix must be released */

	sbi->s_flags   = mount_flags;
	sbi->s_mode    = i;
	sbi->s_uid     = uid;
	sbi->s_gid     = gid;
	sbi->s_reserved= reserved;

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = sb->s_bdev->bd_inode->i_size >> 9;
	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);

	affs_set_blocksize(sb, PAGE_SIZE);
	/* Try to find root block. Its location depends on the block size. */

	i = 512;
	j = 4096;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		sbi->s_root_block = root_block;
		if (root_block < 0)
			sbi->s_root_block = (reserved + size - 1) / 2;
		pr_debug("AFFS: setting blocksize to %d\n", blocksize);
		affs_set_blocksize(sb, blocksize);
		sbi->s_partition_size = size;

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
				"size=%d, reserved=%d\n",
				sb->s_id,
				sbi->s_root_block + num_bm,
				blocksize, size, reserved);
			root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
			if (!root_bh)
				continue;
			if (!affs_checksum_block(sb, root_bh) &&
			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
				sbi->s_hashsize    = blocksize / 4 - 56;
				sbi->s_root_block += num_bm;
				key                        = 1;
				goto got_root;
			}
			affs_brelse(root_bh);
			root_bh = NULL;
		}
	}
	if (!silent)
		printk(KERN_ERR "AFFS: No valid root block on device %s\n",
			sb->s_id);
	return -EINVAL;

	/* N.B. after this point bh must be released */
got_root:
	/* Keep super block in cache */
	sbi->s_root_bh = root_bh;
	root_block = sbi->s_root_block;

	/* Find out which kind of FS we have */
	boot_bh = sb_bread(sb, 0);
	if (!boot_bh) {
		printk(KERN_ERR "AFFS: Cannot read boot block\n");
		return -EINVAL;
	}
	memcpy(sig, boot_bh->b_data, 4);
	brelse(boot_bh);
	chksum = be32_to_cpu(*(__be32 *)sig);

	/* Dircache filesystems are compatible with non-dircache ones
	 * when reading. As long as they aren't supported, writing is
	 * not recommended.
	 */
	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
	     || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
		printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
			sb->s_id);
		sb->s_flags |= MS_RDONLY;
	}
	switch (chksum) {
		case MUFS_FS:
		case MUFS_INTLFFS:
		case MUFS_DCFFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_INTLFFS:
		case FS_DCFFS:
			sbi->s_flags |= SF_INTL;
			break;
		case MUFS_FFS:
			sbi->s_flags |= SF_MUFS;
			break;
		case FS_FFS:
			break;
		case MUFS_OFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_OFS:
			sbi->s_flags |= SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		case MUFS_DCOFS:
		case MUFS_INTLOFS:
			sbi->s_flags |= SF_MUFS;
		case FS_DCOFS:
		case FS_INTLOFS:
			sbi->s_flags |= SF_INTL | SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		default:
			printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
				sb->s_id, chksum);
			return -EINVAL;
	}

	if (mount_flags & SF_VERBOSE) {
		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
		printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
			len > 31 ? 31 : len,
			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
			sig, sig[3] + '0', blocksize);
	}

	sb->s_flags |= MS_NODEV | MS_NOSUID;

	sbi->s_data_blksize = sb->s_blocksize;
	if (sbi->s_flags & SF_OFS)
		sbi->s_data_blksize -= 24;

	tmp_flags = sb->s_flags;
	ret = affs_init_bitmap(sb, &tmp_flags);
	if (ret)
		return ret;
	sb->s_flags = tmp_flags;

	/* set up enough so that it can read an inode */

	root_inode = affs_iget(sb, root_block);
	if (IS_ERR(root_inode))
		return PTR_ERR(root_inode);

	if (AFFS_SB(sb)->s_flags & SF_INTL)
		sb->s_d_op = &affs_intl_dentry_operations;
	else
		sb->s_d_op = &affs_dentry_operations;

	sb->s_root = d_make_root(root_inode);
	if (!sb->s_root) {
		printk(KERN_ERR "AFFS: Get root inode failed\n");
		return -ENOMEM;
	}

	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	return 0;
}
Esempio n. 17
0
static int
affs_remove_link(struct dentry *dentry)
{
    struct inode *dir, *inode = dentry->d_inode;
    struct super_block *sb = inode->i_sb;
    struct buffer_head *bh = NULL, *link_bh = NULL;
    u32 link_ino, ino;
    int retval;

    pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
    retval = -EIO;
    bh = affs_bread(sb, inode->i_ino);
    if (!bh)
        goto done;

    link_ino = (u32)(long)dentry->d_fsdata;
    if (inode->i_ino == link_ino) {
        /* we can't remove the head of the link, as its blocknr is still used as ino,
         * so we remove the block of the first link instead.
         */
        link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
        link_bh = affs_bread(sb, link_ino);
        if (!link_bh)
            goto done;

        dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
        if (IS_ERR(dir)) {
            retval = PTR_ERR(dir);
            goto done;
        }

        affs_lock_dir(dir);
        affs_fix_dcache(dentry, link_ino);
        retval = affs_remove_hash(dir, link_bh);
        if (retval) {
            affs_unlock_dir(dir);
            goto done;
        }
        mark_buffer_dirty_inode(link_bh, inode);

        memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
        retval = affs_insert_hash(dir, bh);
        if (retval) {
            affs_unlock_dir(dir);
            goto done;
        }
        mark_buffer_dirty_inode(bh, inode);

        affs_unlock_dir(dir);
        iput(dir);
    } else {
        link_bh = affs_bread(sb, link_ino);
        if (!link_bh)
            goto done;
    }

    while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
        if (ino == link_ino) {
            __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
            AFFS_TAIL(sb, bh)->link_chain = ino2;
            affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
            mark_buffer_dirty_inode(bh, inode);
            retval = 0;
            /* Fix the link count, if bh is a normal header block without links */
            switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
            case ST_LINKDIR:
            case ST_LINKFILE:
                break;
            default:
                if (!AFFS_TAIL(sb, bh)->link_chain)
                    inode->i_nlink = 1;
            }
            affs_free_block(sb, link_ino);
            goto done;
        }
        affs_brelse(bh);
        bh = affs_bread(sb, ino);
        if (!bh)
            goto done;
    }
    retval = -ENOENT;
done:
    affs_brelse(link_bh);
    affs_brelse(bh);
    return retval;
}
Esempio n. 18
0
File: namei.c Progetto: Abioy/kasan
int
affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct super_block	*sb = dir->i_sb;
	struct buffer_head	*bh;
	struct inode		*inode;
	char			*p;
	int			 i, maxlen, error;
	char			 c, lc;

	pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
		 __func__, dir->i_ino, dentry, symname);

	maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
	inode  = affs_new_inode(dir);
	if (!inode)
		return -ENOSPC;

	inode->i_op = &affs_symlink_inode_operations;
	inode->i_data.a_ops = &affs_symlink_aops;
	inode->i_mode = S_IFLNK | 0777;
	mode_to_prot(inode);

	error = -EIO;
	bh = affs_bread(sb, inode->i_ino);
	if (!bh)
		goto err;
	i  = 0;
	p  = (char *)AFFS_HEAD(bh)->table;
	lc = '/';
	if (*symname == '/') {
		struct affs_sb_info *sbi = AFFS_SB(sb);
		while (*symname == '/')
			symname++;
		spin_lock(&sbi->symlink_lock);
		while (sbi->s_volume[i])	/* Cannot overflow */
			*p++ = sbi->s_volume[i++];
		spin_unlock(&sbi->symlink_lock);
	}
	while (i < maxlen && (c = *symname++)) {
		if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
			*p++ = '/';
			i++;
			symname += 2;
			lc = '/';
		} else if (c == '.' && lc == '/' && *symname == '/') {
			symname++;
			lc = '/';
		} else {
			*p++ = c;
			lc   = c;
			i++;
		}
		if (lc == '/')
			while (*symname == '/')
				symname++;
	}
	*p = 0;
	mark_buffer_dirty_inode(bh, inode);
	affs_brelse(bh);
	mark_inode_dirty(inode);

	error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
	if (error)
		goto err;

	return 0;

err:
	clear_nlink(inode);
	mark_inode_dirty(inode);
	iput(inode);
	return error;
}
Esempio n. 19
0
struct super_block *
affs_read_super(struct super_block *s,void *data, int silent)
{
	struct buffer_head	*bh = NULL;
	struct buffer_head	*bb;
	kdev_t			 dev = s->s_dev;
	int			 root_block;
	int			 size;
	__u32			 chksum;
	__u32			*bm;
	int			 ptype, stype;
	int			 mapidx;
	int			 num_bm;
	int			 i, j;
	int			 key;
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	int			 az_no;
	unsigned long		 mount_flags;
	unsigned long		 offset;

	pr_debug("affs_read_super(%s)\n",data ? (const char *)data : "no options");

	MOD_INC_USE_COUNT;

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	    &blocksize,&s->u.affs_sb.s_prefix,s->u.affs_sb.s_volume,&mount_flags)) {
		s->s_dev = 0;
		printk("AFFS: error parsing options.\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	lock_super(s);

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = blksize_size[MAJOR(dev)][MINOR(dev)];
	size = (size ? size : BLOCK_SIZE) / 512 * blk_size[MAJOR(dev)][MINOR(dev)];

	s->u.affs_sb.s_bitmap  = NULL;
	s->u.affs_sb.s_root_bh = NULL;
	s->u.affs_sb.s_flags   = mount_flags;
	s->u.affs_sb.s_mode    = i;
	s->u.affs_sb.s_uid     = uid;
	s->u.affs_sb.s_gid     = gid;

	if (size == 0) {
		s->s_dev = 0;
		unlock_super(s);
		printk("affs_read_super: could not determine device size\n");
		goto out;
	}
	s->u.affs_sb.s_partition_size = size;
	s->u.affs_sb.s_reserved       = reserved;

	/* Try to find root block. Its location may depend on the block size. */

	s->u.affs_sb.s_hashsize = 0;
	if (blocksize > 0) {
		chksum = blocksize;
		num_bm = blocksize;
	} else {
		chksum = 512;
		num_bm = 4096;
	}
	for (blocksize = chksum; blocksize <= num_bm; blocksize <<= 1, size >>= 1) {
		if (root_block < 0)
			s->u.affs_sb.s_root_block = (reserved + size - 1) / 2;
		else
			s->u.affs_sb.s_root_block = root_block;
		pr_debug("Trying bs=%d bytes, root at %d, size=%d blocks (%d reserved)\n",
			 blocksize,s->u.affs_sb.s_root_block,size,reserved);
		set_blocksize(dev,blocksize);
		bh = affs_bread(dev,s->u.affs_sb.s_root_block,blocksize);
		if (!bh) {
			printk("AFFS: unable to read root block\n");
			goto out;
		}
		if (!affs_checksum_block(blocksize,bh->b_data,&ptype,&stype) &&
		    ptype == T_SHORT && stype == ST_ROOT) {
			s->s_blocksize          = blocksize;
			s->u.affs_sb.s_hashsize = blocksize / 4 - 56;
			break;
		}
		affs_brelse(bh);
		bh = NULL;
	}
	if (!s->u.affs_sb.s_hashsize) {
		affs_brelse(bh);
		if (!silent)
			printk("AFFS: Can't find a valid root block on device %s\n",kdevname(dev));
		goto out;
	}
	root_block = s->u.affs_sb.s_root_block;

	s->u.affs_sb.s_partition_size   = size;
	s->s_blocksize_bits             = blocksize == 512 ? 9 :
					  blocksize == 1024 ? 10 :
					  blocksize == 2048 ? 11 : 12;

	/* Find out which kind of FS we have */
	bb = affs_bread(dev,0,s->s_blocksize);
	if (bb) {
		chksum = htonl(*(__u32 *)bb->b_data);
		switch (chksum) {
			case MUFS_FS:
			case MUFS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_INTLFFS:
				s->u.affs_sb.s_flags |= SF_INTL;
				break;
			case MUFS_FFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				break;
			case FS_FFS:
				break;
			case MUFS_OFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_OFS:
				s->u.affs_sb.s_flags |= SF_OFS;
				break;
			case MUFS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_MUFS;
				/* fall thru */
			case FS_INTLOFS:
				s->u.affs_sb.s_flags |= SF_INTL | SF_OFS;
				break;
			case FS_DCOFS:
			case FS_DCFFS:
			case MUFS_DCOFS:
			case MUFS_DCFFS:
				if (!silent)
					printk("AFFS: Unsupported filesystem on device %s: %08X\n",
					        kdevname(dev),chksum);
				if (0)
			default:
				printk("AFFS: Unknown filesystem on device %s: %08X\n",
				       kdevname(dev),chksum);
				affs_brelse(bb);
				goto out;
		}
		affs_brelse(bb);
	} else {
		printk("AFFS: Can't get boot block.\n");
		goto out;
	}
	if (mount_flags & SF_VERBOSE) {
		chksum = ntohl(chksum);
		printk("AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
		       GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[0],
		       &GET_END_PTR(struct root_end,bh->b_data,blocksize)->disk_name[1],
		       (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
	}