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More aggressively assert that db_mtx protects db.db_data #17209

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More aggressively assert that db_mtx protects db.db_data #17209

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2a66ab3
More aggressively assert that db_mtx protects db.db_data
asomers Apr 1, 2025
7f572ec
Remove a db_mtx assertion in dmu_object_cached_size
asomers Apr 7, 2025
7151741
Refactor dbuf_hold_copy to eliminiate the db_rwlock
asomers Apr 30, 2025
37b48b9
Refactor dbuf_read_hole
asomers Apr 30, 2025
3460c6c
Apply @amotin's suggestions
asomers May 1, 2025
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12 changes: 9 additions & 3 deletions module/zfs/dbuf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1437,19 +1437,21 @@ dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
static int
dbuf_read_bonus(dmu_buf_impl_t *db, dnode_t *dn)
{
void* db_data;
int bonuslen, max_bonuslen;

bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen);
max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
ASSERT(MUTEX_HELD(&db->db_mtx));
ASSERT(DB_DNODE_HELD(db));
ASSERT3U(bonuslen, <=, db->db.db_size);
db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
arc_space_consume(max_bonuslen, ARC_SPACE_BONUS);
if (bonuslen < max_bonuslen)
memset(db->db.db_data, 0, max_bonuslen);
memset(db_data, 0, max_bonuslen);
if (bonuslen)
memcpy(db->db.db_data, DN_BONUS(dn->dn_phys), bonuslen);
memcpy(db_data, DN_BONUS(dn->dn_phys), bonuslen);
db->db.db_data = db_data;
db->db_state = DB_CACHED;
DTRACE_SET_STATE(db, "bonus buffer filled");
return (0);
Expand All @@ -1462,6 +1464,7 @@ dbuf_handle_indirect_hole(dmu_buf_impl_t *db, dnode_t *dn, blkptr_t *dbbp)
uint32_t indbs = 1ULL << dn->dn_indblkshift;
int n_bps = indbs >> SPA_BLKPTRSHIFT;

ASSERT(MUTEX_HELD(&db->db_mtx));
for (int i = 0; i < n_bps; i++) {
blkptr_t *bp = &bps[i];

Expand Down Expand Up @@ -2520,6 +2523,7 @@ dbuf_undirty_bonus(dbuf_dirty_record_t *dr)
{
dmu_buf_impl_t *db = dr->dr_dbuf;

ASSERT(MUTEX_HELD(&db->db_mtx));
if (dr->dt.dl.dr_data != db->db.db_data) {
struct dnode *dn = dr->dr_dnode;
int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
Expand Down Expand Up @@ -3874,6 +3878,7 @@ dbuf_hold_copy(dnode_t *dn, dmu_buf_impl_t *db)
DBUF_GET_BUFC_TYPE(db), db->db.db_size));
}

ASSERT(MUTEX_HELD(&db->db_mtx));
rw_enter(&db->db_rwlock, RW_WRITER);
memcpy(db->db.db_data, data->b_data, arc_buf_size(data));
rw_exit(&db->db_rwlock);
Expand Down Expand Up @@ -3937,6 +3942,7 @@ dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid,

if (db->db_buf != NULL) {
arc_buf_access(db->db_buf);
ASSERT(MUTEX_HELD(&db->db_mtx));
ASSERT3P(db->db.db_data, ==, db->db_buf->b_data);
}

Expand Down
4 changes: 3 additions & 1 deletion module/zfs/dmu_objset.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2263,8 +2263,10 @@ dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
dbuf_dirty_record_t *dr;
void *data;

if (db->db_dirtycnt == 0)
if (db->db_dirtycnt == 0) {
ASSERT(MUTEX_HELD(&db->db_mtx));
return (db->db.db_data); /* Nothing is changing */
}

dr = dbuf_find_dirty_eq(db, tx->tx_txg);

Expand Down
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