libblkid: implement FSSIZE calculation for XFS

The implementation is similar to one provided by statfs(2) + lsblk.

Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com>

diff --git a/libblkid/src/superblocks/xfs.c b/libblkid/src/superblocks/xfs.c
index d8c6fb6d489d4b7259f16b88b0ddce7587caef16..444050f55bf4c6405cfa47f12f73b86e81773540 100644 (file)
--- a/libblkid/src/superblocks/xfs.c
+++ b/libblkid/src/superblocks/xfs.c
@@ -158,6 +158,15 @@ static int xfs_verify_sb(struct xfs_super_block *ondisk)
        return 1;
 }
 
+static uint64_t xfs_fssize(struct xfs_super_block *xs)
+{
+       uint32_t lsize = xs->sb_logstart ? xs->sb_logblocks : 0;
+       uint64_t avail_blocks = be64_to_cpu(xs->sb_dblocks) - be32_to_cpu(lsize);
+       uint64_t fssize = avail_blocks*be32_to_cpu(xs->sb_blocksize);
+
+       return fssize;
+}
+
 static int probe_xfs(blkid_probe pr, const struct blkid_idmag *mag)
 {
        struct xfs_super_block *xs;
@@ -173,6 +182,7 @@ static int probe_xfs(blkid_probe pr, const struct blkid_idmag *mag)
                blkid_probe_set_label(pr, (unsigned char *) xs->sb_fname,
                                sizeof(xs->sb_fname));
        blkid_probe_set_uuid(pr, xs->sb_uuid);
+       blkid_probe_set_fssize(pr, xfs_fssize(xs));
        blkid_probe_set_block_size(pr, be16_to_cpu(xs->sb_sectsize));
        return 0;
 }