Commit be6cacbe authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Darrick J. Wong
Browse files

xfs: refactor xfs_bmapi_allocate 



Avoid duplicate userdata and data fork checks by restructuring the code
so we only have a helper for userdata allocations that combines these
checks in a straight foward way.  That also helps to obsoletes the
comments explaining what the code does as it is now clearly obvious.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
parent e696663a

fs/xfs/libxfs/xfs_bmap.c

+45 −48
Original line number Diff line number Diff line
@@ -3604,20 +3604,6 @@ xfs_bmap_btalloc( 
	return 0;

}



/*

 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.

 * It figures out where to ask the underlying allocator to put the new extent.

 */

STATIC int

xfs_bmap_alloc(

	struct xfs_bmalloca	*ap)	/* bmap alloc argument struct */

{

	if (XFS_IS_REALTIME_INODE(ap->ip) &&

	    xfs_alloc_is_userdata(ap->datatype))

		return xfs_bmap_rtalloc(ap);

	return xfs_bmap_btalloc(ap);

}



/* Trim extent to fit a logical block range. */

void

xfs_trim_extent(
@@ -3973,6 +3959,42 @@ out_unreserve_quota: 
	return error;

}



static int

xfs_bmap_alloc_userdata(

	struct xfs_bmalloca	*bma)

{

	struct xfs_mount	*mp = bma->ip->i_mount;

	int			whichfork = xfs_bmapi_whichfork(bma->flags);

	int			error;



	/*

	 * Set the data type being allocated. For the data fork, the first data

	 * in the file is treated differently to all other allocations. For the

	 * attribute fork, we only need to ensure the allocated range is not on

	 * the busy list.

	 */

	bma->datatype = XFS_ALLOC_NOBUSY;

	if (bma->flags & XFS_BMAPI_ZERO)

		bma->datatype |= XFS_ALLOC_USERDATA_ZERO;

	if (whichfork == XFS_DATA_FORK) {

		if (bma->offset == 0)

			bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;

		else

			bma->datatype |= XFS_ALLOC_USERDATA;



		if (mp->m_dalign && bma->length >= mp->m_dalign) {

			error = xfs_bmap_isaeof(bma, whichfork);

			if (error)

				return error;

		}



		if (XFS_IS_REALTIME_INODE(bma->ip))

			return xfs_bmap_rtalloc(bma);

	}



	return xfs_bmap_btalloc(bma);

}



static int

xfs_bmapi_allocate(

	struct xfs_bmalloca	*bma)
@@ -4000,43 +4022,18 @@ xfs_bmapi_allocate( 
					bma->got.br_startoff - bma->offset);

	}



	/*

	 * Set the data type being allocated. For the data fork, the first data

	 * in the file is treated differently to all other allocations. For the

	 * attribute fork, we only need to ensure the allocated range is not on

	 * the busy list.

	 */

	if (!(bma->flags & XFS_BMAPI_METADATA)) {

		bma->datatype = XFS_ALLOC_NOBUSY;

		if (whichfork == XFS_DATA_FORK) {

			if (bma->offset == 0)

				bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;

	if (bma->flags & XFS_BMAPI_CONTIG)

		bma->minlen = bma->length;

	else

				bma->datatype |= XFS_ALLOC_USERDATA;

		}

		if (bma->flags & XFS_BMAPI_ZERO)

			bma->datatype |= XFS_ALLOC_USERDATA_ZERO;

	}



	bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1;



	/*

	 * Only want to do the alignment at the eof if it is userdata and

	 * allocation length is larger than a stripe unit.

	 */

	if (mp->m_dalign && bma->length >= mp->m_dalign &&

	    !(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {

		error = xfs_bmap_isaeof(bma, whichfork);

		if (error)

			return error;

	}

		bma->minlen = 1;



	error = xfs_bmap_alloc(bma);

	if (error)

	if (bma->flags & XFS_BMAPI_METADATA)

		error = xfs_bmap_btalloc(bma);

	else

		error = xfs_bmap_alloc_userdata(bma);

	if (error || bma->blkno == NULLFSBLOCK)

		return error;



	if (bma->blkno == NULLFSBLOCK)

		return 0;

	if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur)

		bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);

	/*

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