NTFS: Add fs/ntfs/attrib.[hc]::ntfs_resident_attr_value_resize().

	  index entry is in the index root, we forgot to set the @ir pointer in

	  the index context.  Thanks to Yura Pakhuchiy for finding this bug.

	- Remove bogus setting of PageError in ntfs_read_compressed_block().

	- Add fs/ntfs/attrib.[hc]::ntfs_resident_attr_value_resize().

2.1.23 - Implement extension of resident files and make writing safe as well as

	 many bug fixes, cleanups, and enhancements...

	return 0;

}

/**

 * ntfs_resident_attr_value_resize - resize the value of a resident attribute

 * @m:		mft record containing attribute record

 * @a:		attribute record whose value to resize

 * @new_size:	new size in bytes to which to resize the attribute value of @a

 *

 * Resize the value of the attribute @a in the mft record @m to @new_size bytes.

 * If the value is made bigger, the newly allocated space is cleared.

 *

 * Return 0 on success and -errno on error.  The following error codes are

 * defined:

 *	-ENOSPC	- Not enough space in the mft record @m to perform the resize.

 *

 * Note: On error, no modifications have been performed whatsoever.

 *

 * Warning: If you make a record smaller without having copied all the data you

 *	    are interested in the data may be overwritten.

 */

int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,

		const u32 new_size)

{

	u32 old_size;

	/* Resize the resident part of the attribute record. */

	if (ntfs_attr_record_resize(m, a,

			le16_to_cpu(a->data.resident.value_offset) + new_size))

		return -ENOSPC;

	/*

	 * The resize succeeded!  If we made the attribute value bigger, clear

	 * the area between the old size and @new_size.

	 */

	old_size = le32_to_cpu(a->data.resident.value_length);

	if (new_size > old_size)

		memset((u8*)a + le16_to_cpu(a->data.resident.value_offset) +

				old_size, 0, new_size - old_size);

	/* Finally update the length of the attribute value. */

	a->data.resident.value_length = cpu_to_le32(new_size);

	return 0;

}

/**

 * ntfs_attr_make_non_resident - convert a resident to a non-resident attribute

 * @ni:		ntfs inode describing the attribute to convert

		const ATTR_TYPE type);

extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);

extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,

		const u32 new_size);

extern int ntfs_attr_make_non_resident(ntfs_inode *ni);