dir.c

LINUX下读写NTFS分区的工具。 已经集成了通过LIBCONV库支持中文的代码。

 * @pathname:  Pathname to be located
 *
 * Take an ASCII pathname and find the inode that represents it.  The function
 * splits the path and then descends the directory tree.  If @parent is NULL,
 * then the root directory '.' will be used as the base for the search.
 *
 * Return:  inode  Success, the pathname was valid
 *	    NULL   Error, the pathname was invalid, or some other error occurred
 */
ntfs_inode *ntfs_pathname_to_inode(ntfs_volume *vol, ntfs_inode *parent,
		const char *pathname)
{
	u64 inum;
	int len, err = 0;
	char *p, *q;
	ntfs_inode *ni;
	ntfs_inode *result = NULL;
	ntfschar *unicode = NULL;
	char *ascii = NULL;

	if (!vol || !pathname) {
		errno = EINVAL;
		return NULL;
	}
	
	ntfs_log_trace("path: '%s'\n", pathname);
	
	if (parent) {
		ni = parent;
	} else {
		ni = ntfs_inode_open(vol, FILE_root);
		if (!ni) {
			ntfs_log_debug("Couldn't open the inode of the root "
					"directory.\n");
			err = EIO;
			goto close;
		}
	}

	ascii = strdup(pathname);
	if (!ascii) {
		ntfs_log_debug("Out of memory.\n");
		err = ENOMEM;
		goto close;
	}

	p = ascii;
	/* Remove leading /'s. */
	while (p && *p && *p == PATH_SEP)
		p++;
	while (p && *p) {
		/* Find the end of the first token. */
		q = strchr(p, PATH_SEP);
		if (q != NULL) {
			*q = '\0';
			q++;
		}

		len = ntfs_mbstoucs(p, &unicode);
		if (len < 0) {
			ntfs_log_debug("Couldn't convert name to Unicode: %s.\n", p);
			err = errno;
			goto close;
		} else if (len > NTFS_MAX_NAME_LEN) {
			err = ENAMETOOLONG;
			goto close;
		}

		inum = ntfs_inode_lookup_by_name(ni, unicode, len);
		if (inum == (u64) -1) {
			ntfs_log_debug("Couldn't find name '%s' in pathname "
					"'%s'.\n", p, pathname);
			err = ENOENT;
			goto close;
		}

		if (ni != parent)
			if (ntfs_inode_close(ni)) {
				err = errno;
				goto out;
			}

		inum = MREF(inum);
		ni = ntfs_inode_open(vol, inum);
		if (!ni) {
			ntfs_log_debug("Cannot open inode %llu: %s.\n",
					(unsigned long long)inum, p);
			err = EIO;
			goto close;
		}

		free(unicode);
		unicode = NULL;

		p = q;
		while (p && *p && *p == PATH_SEP)
			p++;
	}

	result = ni;
	ni = NULL;
close:
	if (ni && (ni != parent))
		if (ntfs_inode_close(ni) && !err)
			err = errno;
out:
	free(ascii);
	free(unicode);
	if (err)
		errno = err;
	return result;
}

/*
 * The little endian Unicode string ".." for ntfs_readdir().
 */
static const ntfschar dotdot[3] = { const_cpu_to_le16('.'),
				   const_cpu_to_le16('.'),
				   const_cpu_to_le16('\0') };

/*
 * union index_union -
 * More helpers for ntfs_readdir().
 */
typedef union {
	INDEX_ROOT *ir;
	INDEX_ALLOCATION *ia;
} index_union __attribute__((__transparent_union__));

/**
 * enum INDEX_TYPE -
 * More helpers for ntfs_readdir().
 */
typedef enum {
	INDEX_TYPE_ROOT,	/* index root */
	INDEX_TYPE_ALLOCATION,	/* index allocation */
} INDEX_TYPE;

/**
 * ntfs_filldir - ntfs specific filldir method
 * @dir_ni:	ntfs inode of current directory
 * @pos:	current position in directory
 * @ivcn_bits:	log(2) of index vcn size
 * @index_type:	specifies whether @iu is an index root or an index allocation
 * @iu:		index root or index block to which @ie belongs
 * @ie:		current index entry
 * @dirent:	context for filldir callback supplied by the caller
 * @filldir:	filldir callback supplied by the caller
 *
 * Pass information specifying the current directory entry @ie to the @filldir
 * callback.
 */
static int ntfs_filldir(ntfs_inode *dir_ni, s64 *pos, u8 ivcn_bits,
		const INDEX_TYPE index_type, index_union iu, INDEX_ENTRY *ie,
		void *dirent, ntfs_filldir_t filldir)
{
	FILE_NAME_ATTR *fn = &ie->key.file_name;
	unsigned dt_type;

	ntfs_log_trace("Entering.\n");
	
	/* Advance the position even if going to skip the entry. */
	if (index_type == INDEX_TYPE_ALLOCATION)
		*pos = (u8*)ie - (u8*)iu.ia + (sle64_to_cpu(
				iu.ia->index_block_vcn) << ivcn_bits) +
				dir_ni->vol->mft_record_size;
	else /* if (index_type == INDEX_TYPE_ROOT) */
		*pos = (u8*)ie - (u8*)iu.ir;
	/* Skip root directory self reference entry. */
	if (MREF_LE(ie->indexed_file) == FILE_root)
		return 0;
	if (ie->key.file_name.file_attributes & FILE_ATTR_I30_INDEX_PRESENT)
		dt_type = NTFS_DT_DIR;
	else if (fn->file_attributes & FILE_ATTR_SYSTEM)
		dt_type = NTFS_DT_UNKNOWN;
	else
		dt_type = NTFS_DT_REG;
	return filldir(dirent, fn->file_name, fn->file_name_length,
			fn->file_name_type, *pos,
			le64_to_cpu(ie->indexed_file), dt_type);
}

/**
 * ntfs_mft_get_parent_ref - find mft reference of parent directory of an inode
 * @ni:		ntfs inode whose parent directory to find
 *
 * Find the parent directory of the ntfs inode @ni. To do this, find the first
 * file name attribute in the mft record of @ni and return the parent mft
 * reference from that.
 *
 * Note this only makes sense for directories, since files can be hard linked
 * from multiple directories and there is no way for us to tell which one is
 * being looked for.
 *
 * Technically directories can have hard links, too, but we consider that as
 * illegal as Linux/UNIX do not support directory hard links.
 *
 * Return the mft reference of the parent directory on success or -1 on error
 * with errno set to the error code.
 */
static MFT_REF ntfs_mft_get_parent_ref(ntfs_inode *ni)
{
	MFT_REF mref;
	ntfs_attr_search_ctx *ctx;
	FILE_NAME_ATTR *fn;
	int eo;

	ntfs_log_trace("Entering.\n");
	
	if (!ni) {
		errno = EINVAL;
		return ERR_MREF(-1);
	}

	ctx = ntfs_attr_get_search_ctx(ni, NULL);
	if (!ctx)
		return ERR_MREF(-1);
	if (ntfs_attr_lookup(AT_FILE_NAME, AT_UNNAMED, 0, 0, 0, NULL, 0, ctx)) {
		ntfs_log_debug("No file name found in inode 0x%llx. Corrupt "
				"inode.\n", (unsigned long long)ni->mft_no);
		goto err_out;
	}
	if (ctx->attr->non_resident) {
		ntfs_log_debug("File name attribute must be resident. Corrupt inode "
				"0x%llx.\n", (unsigned long long)ni->mft_no);
		goto io_err_out;
	}
	fn = (FILE_NAME_ATTR*)((u8*)ctx->attr +
			le16_to_cpu(ctx->attr->value_offset));
	if ((u8*)fn +	le32_to_cpu(ctx->attr->value_length) >
			(u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) {
		ntfs_log_debug("Corrupt file name attribute in inode 0x%llx.\n",
				(unsigned long long)ni->mft_no);
		goto io_err_out;
	}
	mref = le64_to_cpu(fn->parent_directory);
	ntfs_attr_put_search_ctx(ctx);
	return mref;
io_err_out:
	errno = EIO;
err_out:
	eo = errno;
	ntfs_attr_put_search_ctx(ctx);
	errno = eo;
	return ERR_MREF(-1);
}

/**
 * ntfs_readdir - read the contents of an ntfs directory
 * @dir_ni:	ntfs inode of current directory
 * @pos:	current position in directory
 * @dirent:	context for filldir callback supplied by the caller
 * @filldir:	filldir callback supplied by the caller
 *
 * Parse the index root and the index blocks that are marked in use in the
 * index bitmap and hand each found directory entry to the @filldir callback
 * supplied by the caller.
 *
 * Return 0 on success or -1 on error with errno set to the error code.
 *
 * Note: Index blocks are parsed in ascending vcn order, from which follows
 * that the directory entries are not returned sorted.
 */
int ntfs_readdir(ntfs_inode *dir_ni, s64 *pos,
		void *dirent, ntfs_filldir_t filldir)
{
	s64 i_size, br, ia_pos, bmp_pos, ia_start;
	ntfs_volume *vol;
	ntfs_attr *ia_na, *bmp_na = NULL;
	ntfs_attr_search_ctx *ctx = NULL;
	u8 *index_end, *bmp = NULL;
	INDEX_ROOT *ir;
	INDEX_ENTRY *ie;
	INDEX_ALLOCATION *ia = NULL;
	int rc, ir_pos, bmp_buf_size, bmp_buf_pos, eo;
	u32 index_block_size, index_vcn_size;
	u8 index_block_size_bits, index_vcn_size_bits;

	ntfs_log_trace("Entering.\n");
	
	if (!dir_ni || !pos || !filldir) {
		errno = EINVAL;
		return -1;
	}

	if (!(dir_ni->mrec->flags & MFT_RECORD_IS_DIRECTORY)) {
		errno = ENOTDIR;
		return -1;
	}

	vol = dir_ni->vol;

	ntfs_log_trace("Entering for inode 0x%llx, *pos 0x%llx.\n",
			(unsigned long long)dir_ni->mft_no, (long long)*pos);

	/* Open the index allocation attribute. */
	ia_na = ntfs_attr_open(dir_ni, AT_INDEX_ALLOCATION, NTFS_INDEX_I30, 4);
	if (!ia_na) {
		if (errno != ENOENT) {
			ntfs_log_perror("Failed to open index allocation attribute. "
				"Directory inode 0x%llx is corrupt or bug",
				(unsigned long long)dir_ni->mft_no);
			return -1;
		}
		i_size = 0;
	} else
		i_size = ia_na->data_size;

	rc = 0;

	/* Are we at end of dir yet? */
	if (*pos >= i_size + vol->mft_record_size)
		goto done;

	/* Emulate . and .. for all directories. */
	if (!*pos) {
		rc = filldir(dirent, dotdot, 1, FILE_NAME_POSIX, *pos,
				MK_MREF(dir_ni->mft_no,
				le16_to_cpu(dir_ni->mrec->sequence_number)),
				NTFS_DT_DIR);
		if (rc)
			goto err_out;
		++*pos;
	}
	if (*pos == 1) {
		MFT_REF parent_mref;

		parent_mref = ntfs_mft_get_parent_ref(dir_ni);
		if (parent_mref == ERR_MREF(-1)) {
			ntfs_log_perror("Parent directory not found");
			goto dir_err_out;
		}

		rc = filldir(dirent, dotdot, 2, FILE_NAME_POSIX, *pos,
				parent_mref, NTFS_DT_DIR);
		if (rc)
			goto err_out;
		++*pos;
	}

	ctx = ntfs_attr_get_search_ctx(dir_ni, NULL);
	if (!ctx)
		goto err_out;

	/* Get the offset into the index root attribute. */
	ir_pos = (int)*pos;
	/* Find the index root attribute in the mft record. */
	if (ntfs_attr_lookup(AT_INDEX_ROOT, NTFS_INDEX_I30, 4, CASE_SENSITIVE, 0, NULL,
			0, ctx)) {
		ntfs_log_perror("Index root attribute missing in directory inode "
				"0x%llx", (unsigned long long)dir_ni->mft_no);
		goto dir_err_out;
	}
	/* Get to the index root value. */
	ir = (INDEX_ROOT*)((u8*)ctx->attr +
			le16_to_cpu(ctx->attr->value_offset));

	/* Determine the size of a vcn in the directory index. */
	index_block_size = le32_to_cpu(ir->index_block_size);
	if (index_block_size < NTFS_BLOCK_SIZE ||
			index_block_size & (index_block_size - 1)) {
		ntfs_log_error("Index block size %u is invalid.\n",
				(unsigned)index_block_size);
		goto dir_err_out;
	}
	index_block_size_bits = ffs(index_block_size) - 1;
	if (vol->cluster_size <= index_block_size) {
		index_vcn_size = vol->cluster_size;
		index_vcn_size_bits = vol->cluster_size_bits;
	} else {
		index_vcn_size = vol->sector_size;
		index_vcn_size_bits = vol->sector_size_bits;
	}

	/* Are we jumping straight into the index allocation attribute? */
	if (*pos >= vol->mft_record_size) {
		ntfs_attr_put_search_ctx(ctx);
		ctx = NULL;
		goto skip_index_root;
	}

	index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
	/* The first index entry. */
	ie = (INDEX_ENTRY*)((u8*)&ir->index +
			le32_to_cpu(ir->index.entries_offset));
	/*
	 * Loop until we exceed valid memory (corruption case) or until we
	 * reach the last entry or until filldir tells us it has had enough
	 * or signals an error (both covered by the rc test).
	 */
	for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) {
		ntfs_log_debug("In index root, offset 0x%x.\n", (u8*)ie - (u8*)ir);
		/* Bounds checks. */
		if ((u8*)ie < (u8*)ctx->mrec || (u8*)ie +
				sizeof(INDEX_ENTRY_HEADER) > index_end ||
				(u8*)ie + le16_to_cpu(ie->key_length) >
				index_end)
			goto dir_err_out;
		/* The last entry cannot contain a name. */
		if (ie->ie_flags & INDEX_ENTRY_END)
			break;
		/* Skip index root entry if continuing previous readdir. */
		if (ir_pos > (u8*)ie - (u8*)ir)
			continue;
		/*
		 * Submit the directory entry to ntfs_filldir(), which will
		 * invoke the filldir() callback as appropriate.
		 */
		rc = ntfs_filldir(dir_ni, pos, index_vcn_size_bits,