C++ (Cpp) trace_xfs_reflink_remap_blocks_loop Examples

Example #1

File: xfs_reflink.c Project: oscardagrach/linux

/*
 * Iteratively remap one file's extents (and holes) to another's.
 */
STATIC int
xfs_reflink_remap_blocks(
	struct xfs_inode	*src,
	xfs_fileoff_t		srcoff,
	struct xfs_inode	*dest,
	xfs_fileoff_t		destoff,
	xfs_filblks_t		len,
	xfs_off_t		new_isize)
{
	struct xfs_bmbt_irec	imap;
	int			nimaps;
	int			error = 0;
	xfs_filblks_t		range_len;

	/* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */
	while (len) {
		trace_xfs_reflink_remap_blocks_loop(src, srcoff, len,
				dest, destoff);
		/* Read extent from the source file */
		nimaps = 1;
		xfs_ilock(src, XFS_ILOCK_EXCL);
		error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0);
		xfs_iunlock(src, XFS_ILOCK_EXCL);
		if (error)
			goto err;
		ASSERT(nimaps == 1);

		trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_IO_OVERWRITE,
				&imap);

		/* Translate imap into the destination file. */
		range_len = imap.br_startoff + imap.br_blockcount - srcoff;
		imap.br_startoff += destoff - srcoff;

		/* Clear dest from destoff to the end of imap and map it in. */
		error = xfs_reflink_remap_extent(dest, &imap, destoff,
				new_isize);
		if (error)
			goto err;

		if (fatal_signal_pending(current)) {
			error = -EINTR;
			goto err;
		}

		/* Advance drange/srange */
		srcoff += range_len;
		destoff += range_len;
		len -= range_len;
	}

	return 0;

err:
	trace_xfs_reflink_remap_blocks_error(dest, error, _RET_IP_);
	return error;
}

Example #2

File: xfs_reflink.c Project: Anjali05/linux

/*
 * Iteratively remap one file's extents (and holes) to another's.
 */
int
xfs_reflink_remap_blocks(
	struct xfs_inode	*src,
	loff_t			pos_in,
	struct xfs_inode	*dest,
	loff_t			pos_out,
	loff_t			remap_len,
	loff_t			*remapped)
{
	struct xfs_bmbt_irec	imap;
	xfs_fileoff_t		srcoff;
	xfs_fileoff_t		destoff;
	xfs_filblks_t		len;
	xfs_filblks_t		range_len;
	xfs_filblks_t		remapped_len = 0;
	xfs_off_t		new_isize = pos_out + remap_len;
	int			nimaps;
	int			error = 0;

	destoff = XFS_B_TO_FSBT(src->i_mount, pos_out);
	srcoff = XFS_B_TO_FSBT(src->i_mount, pos_in);
	len = XFS_B_TO_FSB(src->i_mount, remap_len);

	/* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */
	while (len) {
		uint		lock_mode;

		trace_xfs_reflink_remap_blocks_loop(src, srcoff, len,
				dest, destoff);

		/* Read extent from the source file */
		nimaps = 1;
		lock_mode = xfs_ilock_data_map_shared(src);
		error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0);
		xfs_iunlock(src, lock_mode);
		if (error)
			break;
		ASSERT(nimaps == 1);

		trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_DATA_FORK,
				&imap);

		/* Translate imap into the destination file. */
		range_len = imap.br_startoff + imap.br_blockcount - srcoff;
		imap.br_startoff += destoff - srcoff;

		/* Clear dest from destoff to the end of imap and map it in. */
		error = xfs_reflink_remap_extent(dest, &imap, destoff,
				new_isize);
		if (error)
			break;

		if (fatal_signal_pending(current)) {
			error = -EINTR;
			break;
		}

		/* Advance drange/srange */
		srcoff += range_len;
		destoff += range_len;
		len -= range_len;
		remapped_len += range_len;
	}

	if (error)
		trace_xfs_reflink_remap_blocks_error(dest, error, _RET_IP_);
	*remapped = min_t(loff_t, remap_len,
			  XFS_FSB_TO_B(src->i_mount, remapped_len));
	return error;
}