Commit e5376fc1 authored by Brian Foster's avatar Brian Foster Committed by Dave Chinner
Browse files

xfs: sparse inode chunks feature helpers and mount requirements 



The sparse inode chunks feature uses the helper function to enable the
allocation of sparse inode chunks. The incompatible feature bit is set
on disk at mkfs time to prevent mount from unsupported kernels.

Also, enforce the inode alignment requirements required for sparse inode
chunks at mount time. When enabled, full inode chunks (and all inode
record) alignment is increased from cluster size to inode chunk size.
Sparse inode alignment must match the cluster size of the fs. Both
superblock alignment fields are set as such by mkfs when sparse inode
support is enabled.

Finally, warn that sparse inode chunks is an experimental feature until
further notice.

Signed-off-by: default avatarBrian Foster <bfoster@redhat.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 066a1884

fs/xfs/libxfs/xfs_format.h

+7 −0
Original line number Diff line number Diff line
@@ -457,6 +457,7 @@ xfs_sb_has_ro_compat_feature( 
}



#define XFS_SB_FEAT_INCOMPAT_FTYPE	(1 << 0)	/* filetype in dirent */

#define XFS_SB_FEAT_INCOMPAT_SPINODES	(1 << 1)	/* sparse inode chunks */

#define XFS_SB_FEAT_INCOMPAT_ALL \

		(XFS_SB_FEAT_INCOMPAT_FTYPE)
@@ -506,6 +507,12 @@ static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 
		(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);

}



static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)

{

	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&

		xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);

}



/*

 * end of superblock version macros

 */

fs/xfs/libxfs/xfs_sb.c

+21 −0
Original line number Diff line number Diff line
@@ -174,6 +174,27 @@ xfs_mount_validate_sb( 
			return -EFSCORRUPTED;

	}



	/*

	 * Full inode chunks must be aligned to inode chunk size when

	 * sparse inodes are enabled to support the sparse chunk

	 * allocation algorithm and prevent overlapping inode records.

	 */

	if (xfs_sb_version_hassparseinodes(sbp)) {

		uint32_t	align;



		xfs_alert(mp,

	"EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");



		align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize

				>> sbp->sb_blocklog;

		if (sbp->sb_inoalignmt != align) {

			xfs_warn(mp,

"Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",

				 sbp->sb_inoalignmt, align);

			return -EINVAL;

		}

	}



	if (unlikely(

	    sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {

		xfs_warn(mp,

fs/xfs/xfs_mount.c

+16 −0
Original line number Diff line number Diff line
@@ -724,6 +724,22 @@ xfs_mountfs( 
			mp->m_inode_cluster_size = new_size;

	}



	/*

	 * If enabled, sparse inode chunk alignment is expected to match the

	 * cluster size. Full inode chunk alignment must match the chunk size,

	 * but that is checked on sb read verification...

	 */

	if (xfs_sb_version_hassparseinodes(&mp->m_sb) &&

	    mp->m_sb.sb_spino_align !=

			XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) {

		xfs_warn(mp,

	"Sparse inode block alignment (%u) must match cluster size (%llu).",

			 mp->m_sb.sb_spino_align,

			 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size));

		error = -EINVAL;

		goto out_remove_uuid;

	}



	/*

	 * Set inode alignment fields

	 */

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