diff options
Diffstat (limited to 'module/zfs/dbuf.c')
| -rw-r--r-- | module/zfs/dbuf.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c index 0518205f9..f8f96c142 100644 --- a/module/zfs/dbuf.c +++ b/module/zfs/dbuf.c @@ -3931,6 +3931,46 @@ dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) zio_nowait(zio); } +#ifdef ZFS_DEBUG +/* + * Verify that the size of the data in our bonus buffer does not exceed + * its recorded size. + * + * The purpose of this verification is to catch any cases in development + * where the size of a phys structure (i.e space_map_phys_t) grows and, + * due to incorrect feature management, older pools expect to read more + * data even though they didn't actually write it to begin with. + * + * For a example, this would catch an error in the feature logic where we + * open an older pool and we expect to write the space map histogram of + * a space map with size SPACE_MAP_SIZE_V0. + */ +static void +dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr) +{ + dnode_t *dn = DB_DNODE(dr->dr_dbuf); + + /* + * Encrypted bonus buffers can have data past their bonuslen. + * Skip the verification of these blocks. + */ + if (DMU_OT_IS_ENCRYPTED(dn->dn_bonustype)) + return; + + uint16_t bonuslen = dn->dn_phys->dn_bonuslen; + uint16_t maxbonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots); + ASSERT3U(bonuslen, <=, maxbonuslen); + + arc_buf_t *datap = dr->dt.dl.dr_data; + char *datap_end = ((char *)datap) + bonuslen; + char *datap_max = ((char *)datap) + maxbonuslen; + + /* ensure that everything is zero after our data */ + for (; datap_end < datap_max; datap_end++) + ASSERT(*datap_end == 0); +} +#endif + /* * dbuf_sync_leaf() is called recursively from dbuf_sync_list() so it is * critical the we not allow the compiler to inline this function in to @@ -4007,6 +4047,10 @@ dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) DN_MAX_BONUS_LEN(dn->dn_phys)); DB_DNODE_EXIT(db); +#ifdef ZFS_DEBUG + dbuf_sync_leaf_verify_bonus_dnode(dr); +#endif + if (*datap != db->db.db_data) { int slots = DB_DNODE(db)->dn_num_slots; int bonuslen = DN_SLOTS_TO_BONUSLEN(slots); |