C++ (Cpp) xfs_reflink_end_cow Examples

Example #1

File: xfs_aops.c Project: AshishNamdev/linux

/*
 * IO write completion.
 */
STATIC void
xfs_end_io(
	struct work_struct *work)
{
	struct xfs_ioend	*ioend =
		container_of(work, struct xfs_ioend, io_work);
	struct xfs_inode	*ip = XFS_I(ioend->io_inode);
	int			error = ioend->io_bio->bi_error;

	/*
	 * Set an error if the mount has shut down and proceed with end I/O
	 * processing so it can perform whatever cleanups are necessary.
	 */
	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
		error = -EIO;

	/*
	 * For a CoW extent, we need to move the mapping from the CoW fork
	 * to the data fork.  If instead an error happened, just dump the
	 * new blocks.
	 */
	if (ioend->io_type == XFS_IO_COW) {
		if (error)
			goto done;
		if (ioend->io_bio->bi_error) {
			error = xfs_reflink_cancel_cow_range(ip,
					ioend->io_offset, ioend->io_size);
			goto done;
		}
		error = xfs_reflink_end_cow(ip, ioend->io_offset,
				ioend->io_size);
		if (error)
			goto done;
	}

	/*
	 * For unwritten extents we need to issue transactions to convert a
	 * range to normal written extens after the data I/O has finished.
	 * Detecting and handling completion IO errors is done individually
	 * for each case as different cleanup operations need to be performed
	 * on error.
	 */
	if (ioend->io_type == XFS_IO_UNWRITTEN) {
		if (error)
			goto done;
		error = xfs_iomap_write_unwritten(ip, ioend->io_offset,
						  ioend->io_size);
	} else if (ioend->io_append_trans) {
		error = xfs_setfilesize_ioend(ioend, error);
	} else {
		ASSERT(!xfs_ioend_is_append(ioend) ||
		       ioend->io_type == XFS_IO_COW);
	}

done:
	xfs_destroy_ioend(ioend, error);
}

Example #2

File: xfs_file.c Project: oscardagrach/linux

static int
xfs_dio_write_end_io(
	struct kiocb		*iocb,
	ssize_t			size,
	unsigned		flags)
{
	struct inode		*inode = file_inode(iocb->ki_filp);
	struct xfs_inode	*ip = XFS_I(inode);
	loff_t			offset = iocb->ki_pos;
	int			error = 0;

	trace_xfs_end_io_direct_write(ip, offset, size);

	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
		return -EIO;

	if (size <= 0)
		return size;

	if (flags & IOMAP_DIO_COW) {
		error = xfs_reflink_end_cow(ip, offset, size);
		if (error)
			return error;
	}

	/*
	 * Unwritten conversion updates the in-core isize after extent
	 * conversion but before updating the on-disk size. Updating isize any
	 * earlier allows a racing dio read to find unwritten extents before
	 * they are converted.
	 */
	if (flags & IOMAP_DIO_UNWRITTEN)
		return xfs_iomap_write_unwritten(ip, offset, size, true);

	/*
	 * We need to update the in-core inode size here so that we don't end up
	 * with the on-disk inode size being outside the in-core inode size. We
	 * have no other method of updating EOF for AIO, so always do it here
	 * if necessary.
	 *
	 * We need to lock the test/set EOF update as we can be racing with
	 * other IO completions here to update the EOF. Failing to serialise
	 * here can result in EOF moving backwards and Bad Things Happen when
	 * that occurs.
	 */
	spin_lock(&ip->i_flags_lock);
	if (offset + size > i_size_read(inode)) {
		i_size_write(inode, offset + size);
		spin_unlock(&ip->i_flags_lock);
		error = xfs_setfilesize(ip, offset, size);
	} else {
		spin_unlock(&ip->i_flags_lock);
	}

	return error;
}