LU-9774 mdt: mdt_dump_lmm(), don't panic

skip compond layouts as mdt_dump_lmm() doesn't understand that yet.

Change-Id: I48d447f81d58466f473de871bc59d011d8b6f7ba
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: https://review.whamcloud.com/29188
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>

diff --git a/lustre/mdt/mdt_lib.c b/lustre/mdt/mdt_lib.c
index 83b30b9..a6c7fa5 100644 (file)
--- a/lustre/mdt/mdt_lib.c
+++ b/lustre/mdt/mdt_lib.c
@@ -576,18 +576,23 @@ int mdt_init_ucred_reint(struct mdt_thread_info *info)
 /* copied from lov/lov_ea.c, just for debugging, will be removed later */
 void mdt_dump_lmm(int level, const struct lov_mds_md *lmm, __u64 valid)
 {
-       const struct lov_ost_data_v1    *lod;
-       int                              i;
-       __u16                            count;
+       const struct lov_ost_data_v1 *lod;
+       __u32 lmm_magic = le32_to_cpu(lmm->lmm_magic);
+       __u16 count;
+       int i;
 
        if (likely(!cfs_cdebug_show(level, DEBUG_SUBSYSTEM)))
                return;
 
-       count = le16_to_cpu(((struct lov_user_md *)lmm)->lmm_stripe_count);
-
        CDEBUG(level, "objid "DOSTID", magic 0x%08X, pattern %#X\n",
-              POSTID(&lmm->lmm_oi), le32_to_cpu(lmm->lmm_magic),
+              POSTID(&lmm->lmm_oi), lmm_magic,
               le32_to_cpu(lmm->lmm_pattern));
+
+       /* No support for compount layouts yet */
+       if (lmm_magic != LOV_MAGIC_V1 && lmm_magic != LOV_MAGIC_V3)
+               return;
+
+       count = le16_to_cpu(((struct lov_user_md *)lmm)->lmm_stripe_count);
        CDEBUG(level, "stripe_size=0x%x, stripe_count=0x%x\n",
               le32_to_cpu(lmm->lmm_stripe_size), count);