[PATCH] Check block magic number so we scan only valid blocks.

[Peter Watkins]

OK, thanks for taking a look.

Here's the complete patch in case anyone is interested.

 -Peter

Signed-off-by: Peter Watkins <treestem at gmail.com>
---
 db/freesp.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/db/freesp.c b/db/freesp.c
index e1902c6..c4dabad 100644
--- a/db/freesp.c
+++ b/db/freesp.c
@@ -286,6 +286,9 @@ scanfunc_bno(
 	xfs_alloc_ptr_t		*pp;
 	xfs_alloc_rec_t		*rp;
 
+	if (be32_to_cpu(block->bb_magic) != XFS_ABTB_MAGIC)
+		return;
+
 	if (level == 0) {
 		rp = XFS_ALLOC_REC_ADDR(mp, block, 1);
 		for (i = 0; i < be16_to_cpu(block->bb_numrecs); i++)
@@ -310,6 +313,9 @@ scanfunc_cnt(
 	xfs_alloc_ptr_t		*pp;
 	xfs_alloc_rec_t		*rp;
 
+	if (be32_to_cpu(block->bb_magic) != XFS_ABTC_MAGIC)
+		return;
+
 	if (level == 0) {
 		rp = XFS_ALLOC_REC_ADDR(mp, block, 1);
 		for (i = 0; i < be16_to_cpu(block->bb_numrecs); i++)
-- 
1.6.0.4