[PATCH 2/4] libblkid: add FSLASTBLOCK implementation for xfs, ext and btrfs

[Andrey Albershteyn <aalbersh@redhat.com>]

Implementation of FSLASTBLOCK for most common filesystems. Most of
the fs store total number of reserved blocks in superblock.

Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com>
---
 libblkid/src/superblocks/btrfs.c | 5 +++++
 libblkid/src/superblocks/ext.c   | 5 +++++
 libblkid/src/superblocks/xfs.c   | 1 +
 3 files changed, 11 insertions(+)

diff --git a/libblkid/src/superblocks/btrfs.c b/libblkid/src/superblocks/btrfs.c
index 78d767d26..0ead1f591 100644
--- a/libblkid/src/superblocks/btrfs.c
+++ b/libblkid/src/superblocks/btrfs.c
@@ -236,6 +236,11 @@ static int probe_btrfs(blkid_probe pr, const struct blkid_idmag *mag)
 	blkid_probe_set_uuid_as(pr, bfs->dev_item.uuid, "UUID_SUB");
 	blkid_probe_set_block_size(pr, le32_to_cpu(bfs->sectorsize));
 
+	uint32_t sectorsize_log = 31 -
+		__builtin_clz(le32_to_cpu(bfs->sectorsize));
+	blkid_probe_set_fslastblock(pr,
+			le64_to_cpu(bfs->total_bytes) >> sectorsize_log);
+
 	return 0;
 }
 
diff --git a/libblkid/src/superblocks/ext.c b/libblkid/src/superblocks/ext.c
index 3870522fa..105bdfcf3 100644
--- a/libblkid/src/superblocks/ext.c
+++ b/libblkid/src/superblocks/ext.c
@@ -190,6 +190,11 @@ static void ext_get_info(blkid_probe pr, int ver, struct ext2_super_block *es)
 
 	if (le32_to_cpu(es->s_log_block_size) < 32)
 		blkid_probe_set_block_size(pr, 1024U << le32_to_cpu(es->s_log_block_size));
+
+	uint64_t fslastblock = es->s_blocks_count |
+		((es->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ?
+		(uint64_t) es->s_blocks_count_hi << 32 : 0);
+	blkid_probe_set_fslastblock(pr, fslastblock);
 }
 
 
diff --git a/libblkid/src/superblocks/xfs.c b/libblkid/src/superblocks/xfs.c
index 444050f55..1f2e92cac 100644
--- a/libblkid/src/superblocks/xfs.c
+++ b/libblkid/src/superblocks/xfs.c
@@ -183,6 +183,7 @@ static int probe_xfs(blkid_probe pr, const struct blkid_idmag *mag)
 				sizeof(xs->sb_fname));
 	blkid_probe_set_uuid(pr, xs->sb_uuid);
 	blkid_probe_set_fssize(pr, xfs_fssize(xs));
+	blkid_probe_set_fslastblock(pr, be64_to_cpu(xs->sb_dblocks));
 	blkid_probe_set_block_size(pr, be16_to_cpu(xs->sb_sectsize));
 	return 0;
 }
-- 
2.27.0