From e89c041338ed6ef2694e6465ca1ba033e0a2978c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 28 Mar 2017 14:56:37 -0700 Subject: xfs: implement the GETFSMAP ioctl Introduce a new ioctl that uses the reverse mapping btree to return information about the physical layout of the filesystem. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster --- fs/xfs/libxfs/xfs_rmap.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'fs/xfs/libxfs/xfs_rmap.c') diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c index 384055668374..06cfb93c2ef9 100644 --- a/fs/xfs/libxfs/xfs_rmap.c +++ b/fs/xfs/libxfs/xfs_rmap.c @@ -2305,3 +2305,31 @@ xfs_rmap_free_extent( return __xfs_rmap_add(mp, dfops, XFS_RMAP_FREE, owner, XFS_DATA_FORK, &bmap); } + +/* Compare rmap records. Returns -1 if a < b, 1 if a > b, and 0 if equal. */ +int +xfs_rmap_compare( + const struct xfs_rmap_irec *a, + const struct xfs_rmap_irec *b) +{ + __u64 oa; + __u64 ob; + + oa = xfs_rmap_irec_offset_pack(a); + ob = xfs_rmap_irec_offset_pack(b); + + if (a->rm_startblock < b->rm_startblock) + return -1; + else if (a->rm_startblock > b->rm_startblock) + return 1; + else if (a->rm_owner < b->rm_owner) + return -1; + else if (a->rm_owner > b->rm_owner) + return 1; + else if (oa < ob) + return -1; + else if (oa > ob) + return 1; + else + return 0; +} -- cgit v1.2.3