diff options
author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-18 07:37:32 +0300 |
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committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-27 01:38:23 +0300 |
commit | 21ec54168b368f1a98097dee00625ec8ec2d47f3 (patch) | |
tree | 953541b86d06cdbb48e7f8d0f0d5707b2b627cb6 /fs/xfs/libxfs/xfs_alloc.c | |
parent | ed438b476b611c67089760037139f93ea8ed41d5 (diff) | |
download | linux-21ec54168b368f1a98097dee00625ec8ec2d47f3.tar.xz |
xfs: create block pointer check functions
Create some helper functions to check that a block pointer points
within the filesystem (or AG) and doesn't point at static metadata.
We will use this for scrub.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_alloc.c')
-rw-r--r-- | fs/xfs/libxfs/xfs_alloc.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index f965ce832bc0..11c01e2668bf 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -2931,3 +2931,52 @@ xfs_alloc_query_all( query.fn = fn; return xfs_btree_query_all(cur, xfs_alloc_query_range_helper, &query); } + +/* Find the size of the AG, in blocks. */ +xfs_agblock_t +xfs_ag_block_count( + struct xfs_mount *mp, + xfs_agnumber_t agno) +{ + ASSERT(agno < mp->m_sb.sb_agcount); + + if (agno < mp->m_sb.sb_agcount - 1) + return mp->m_sb.sb_agblocks; + return mp->m_sb.sb_dblocks - (agno * mp->m_sb.sb_agblocks); +} + +/* + * Verify that an AG block number pointer neither points outside the AG + * nor points at static metadata. + */ +bool +xfs_verify_agbno( + struct xfs_mount *mp, + xfs_agnumber_t agno, + xfs_agblock_t agbno) +{ + xfs_agblock_t eoag; + + eoag = xfs_ag_block_count(mp, agno); + if (agbno >= eoag) + return false; + if (agbno <= XFS_AGFL_BLOCK(mp)) + return false; + return true; +} + +/* + * Verify that an FS block number pointer neither points outside the + * filesystem nor points at static AG metadata. + */ +bool +xfs_verify_fsbno( + struct xfs_mount *mp, + xfs_fsblock_t fsbno) +{ + xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno); + + if (agno >= mp->m_sb.sb_agcount) + return false; + return xfs_verify_agbno(mp, agno, XFS_FSB_TO_AGBNO(mp, fsbno)); +} |