Commit f8e566c0 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: validate the realtime geometry in xfs_validate_sb_common 



Validate the geometry of the realtime geometry when we mount the
filesystem, so that we don't abruptly shut down the filesystem later on.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
parent 27fb5a72

fs/xfs/libxfs/xfs_sb.c

+32 −0
Original line number Diff line number Diff line
@@ -328,6 +328,38 @@ xfs_validate_sb_common( 
		return -EFSCORRUPTED;

	}



	/* Validate the realtime geometry; stolen from xfs_repair */

	if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||

	    sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) {

		xfs_notice(mp,

			"realtime extent sanity check failed");

		return -EFSCORRUPTED;

	}



	if (sbp->sb_rblocks == 0) {

		if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||

		    sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) {

			xfs_notice(mp,

				"realtime zeroed geometry check failed");

			return -EFSCORRUPTED;

		}

	} else {

		uint64_t	rexts;

		uint64_t	rbmblocks;



		rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize);

		rbmblocks = howmany_64(sbp->sb_rextents,

				       NBBY * sbp->sb_blocksize);



		if (sbp->sb_rextents != rexts ||

		    sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) ||

		    sbp->sb_rbmblocks != rbmblocks) {

			xfs_notice(mp,

				"realtime geometry sanity check failed");

			return -EFSCORRUPTED;

		}

	}



	if (sbp->sb_unit) {

		if (!xfs_sb_version_hasdalign(sbp) ||

		    sbp->sb_unit > sbp->sb_width ||

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