Factor out some dbuf subroutines and add state change tracing
Create dedicated dbuf_read_hole and dbuf_read_bonus. Additionally, add a dtrace probe to allow state change tracing. Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Will Andrews <wca@FreeBSD.org> Reviewed by: Brad Lewis <brad.lewis@delphix.com> Authored-by: Will Andrews <wca@FreeBSD.org> Signed-off-by: Matt Macy <mmacy@FreeBSD.org> Closes #9923
This commit is contained in:
Matthew Macy
GitHub
parent
f244846462
commit
8b3547a481
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@ -107,6 +107,14 @@ DECLARE_EVENT_CLASS(zfs_dbuf_class,
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TP_fast_assign(DBUF_TP_FAST_ASSIGN),
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TP_printk("%s", __get_str(msg))
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);
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DECLARE_EVENT_CLASS(zfs_dbuf_state_class,
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TP_PROTO(dmu_buf_impl_t *db, const char *why),
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TP_ARGS(db, why),
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TP_STRUCT__entry(DBUF_TP_STRUCT_ENTRY),
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TP_fast_assign(DBUF_TP_FAST_ASSIGN),
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TP_printk("%s", __get_str(msg))
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);
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/* END CSTYLED */
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/* BEGIN CSTYLED */
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@ -117,6 +125,14 @@ DEFINE_EVENT(zfs_dbuf_class, name, \
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/* END CSTYLED */
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DEFINE_DBUF_EVENT(zfs_blocked__read);
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/* BEGIN CSTYLED */
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#define DEFINE_DBUF_STATE_EVENT(name) \
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DEFINE_EVENT(zfs_dbuf_state_class, name, \
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TP_PROTO(dmu_buf_impl_t *db, const char *why), \
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TP_ARGS(db, why))
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/* END CSTYLED */
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DEFINE_DBUF_STATE_EVENT(zfs_dbuf__state_change);
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/* BEGIN CSTYLED */
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DECLARE_EVENT_CLASS(zfs_dbuf_evict_one_class,
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TP_PROTO(dmu_buf_impl_t *db, multilist_sublist_t *mls),
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@ -147,6 +163,7 @@ DEFINE_DBUF_EVICT_ONE_EVENT(zfs_dbuf__evict__one);
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DEFINE_DTRACE_PROBE2(blocked__read);
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DEFINE_DTRACE_PROBE2(dbuf__evict__one);
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DEFINE_DTRACE_PROBE2(dbuf__state_change);
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#endif /* HAVE_DECLARE_EVENT_CLASS */
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#endif /* _KERNEL */
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@ -151,6 +151,7 @@ dbuf_stats_t dbuf_stats = {
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static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx);
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static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx);
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static void dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr);
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static int dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags);
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extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu,
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dmu_buf_evict_func_t *evict_func_sync,
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@ -302,6 +303,10 @@ dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid)
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return (cityhash4((uintptr_t)os, obj, (uint64_t)lvl, blkid));
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}
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#define DTRACE_SET_STATE(db, why) \
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DTRACE_PROBE2(dbuf__state_change, dmu_buf_impl_t *, db, \
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const char *, why)
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#define DBUF_EQUAL(dbuf, os, obj, level, blkid) \
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((dbuf)->db.db_object == (obj) && \
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(dbuf)->db_objset == (os) && \
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@ -1064,8 +1069,10 @@ dbuf_clear_data(dmu_buf_impl_t *db)
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dbuf_evict_user(db);
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ASSERT3P(db->db_buf, ==, NULL);
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db->db.db_data = NULL;
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if (db->db_state != DB_NOFILL)
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if (db->db_state != DB_NOFILL) {
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db->db_state = DB_UNCACHED;
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DTRACE_SET_STATE(db, "clear data");
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}
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}
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static void
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@ -1079,6 +1086,14 @@ dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf)
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db->db.db_data = buf->b_data;
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}
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static arc_buf_t *
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dbuf_alloc_arcbuf(dmu_buf_impl_t *db)
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{
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spa_t *spa = db->db_objset->os_spa;
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return (arc_alloc_buf(spa, db, DBUF_GET_BUFC_TYPE(db), db->db.db_size));
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}
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/*
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* Loan out an arc_buf for read. Return the loaned arc_buf.
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*/
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@ -1210,6 +1225,7 @@ dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
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ASSERT(db->db_blkid != DMU_BONUS_BLKID);
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ASSERT3P(db->db_buf, ==, NULL);
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db->db_state = DB_UNCACHED;
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DTRACE_SET_STATE(db, "i/o error");
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} else if (db->db_level == 0 && db->db_freed_in_flight) {
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/* freed in flight */
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ASSERT(zio == NULL || zio->io_error == 0);
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@ -1219,16 +1235,104 @@ dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
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db->db_freed_in_flight = FALSE;
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dbuf_set_data(db, buf);
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db->db_state = DB_CACHED;
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DTRACE_SET_STATE(db, "freed in flight");
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} else {
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/* success */
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ASSERT(zio == NULL || zio->io_error == 0);
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dbuf_set_data(db, buf);
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db->db_state = DB_CACHED;
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DTRACE_SET_STATE(db, "successful read");
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}
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cv_broadcast(&db->db_changed);
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dbuf_rele_and_unlock(db, NULL, B_FALSE);
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}
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/*
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* Shortcut for performing reads on bonus dbufs. Returns
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* an error if we fail to verify the dnode associated with
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* a decrypted block. Otherwise success.
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*/
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static int
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dbuf_read_bonus(dmu_buf_impl_t *db, dnode_t *dn, uint32_t flags)
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{
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int bonuslen, max_bonuslen, err;
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err = dbuf_read_verify_dnode_crypt(db, flags);
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if (err)
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return (err);
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bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen);
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max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
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ASSERT(MUTEX_HELD(&db->db_mtx));
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ASSERT(DB_DNODE_HELD(db));
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ASSERT3U(bonuslen, <=, db->db.db_size);
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db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
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arc_space_consume(max_bonuslen, ARC_SPACE_BONUS);
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if (bonuslen < max_bonuslen)
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bzero(db->db.db_data, max_bonuslen);
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if (bonuslen)
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bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen);
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db->db_state = DB_CACHED;
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DTRACE_SET_STATE(db, "bonus buffer filled");
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return (0);
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}
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static void
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dbuf_handle_indirect_hole(dmu_buf_impl_t *db, dnode_t *dn)
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{
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blkptr_t *bps = db->db.db_data;
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uint32_t indbs = 1ULL << dn->dn_indblkshift;
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int n_bps = indbs >> SPA_BLKPTRSHIFT;
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for (int i = 0; i < n_bps; i++) {
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blkptr_t *bp = &bps[i];
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ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, indbs);
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BP_SET_LSIZE(bp, BP_GET_LEVEL(db->db_blkptr) == 1 ?
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dn->dn_datablksz : BP_GET_LSIZE(db->db_blkptr));
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BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr));
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BP_SET_LEVEL(bp, BP_GET_LEVEL(db->db_blkptr) - 1);
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BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0);
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}
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}
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/*
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* Handle reads on dbufs that are holes, if necessary. This function
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* requires that the dbuf's mutex is held. Returns success (0) if action
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* was taken, ENOENT if no action was taken.
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*/
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static int
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dbuf_read_hole(dmu_buf_impl_t *db, dnode_t *dn, uint32_t flags)
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{
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ASSERT(MUTEX_HELD(&db->db_mtx));
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int is_hole = db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr);
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/*
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* For level 0 blocks only, if the above check fails:
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* Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync()
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* processes the delete record and clears the bp while we are waiting
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* for the dn_mtx (resulting in a "no" from block_freed).
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*/
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if (!is_hole && db->db_level == 0) {
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is_hole = dnode_block_freed(dn, db->db_blkid) ||
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BP_IS_HOLE(db->db_blkptr);
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}
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if (is_hole) {
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dbuf_set_data(db, dbuf_alloc_arcbuf(db));
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bzero(db->db.db_data, db->db.db_size);
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if (db->db_blkptr != NULL && db->db_level > 0 &&
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BP_IS_HOLE(db->db_blkptr) &&
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db->db_blkptr->blk_birth != 0) {
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dbuf_handle_indirect_hole(db, dn);
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}
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db->db_state = DB_CACHED;
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DTRACE_SET_STATE(db, "hole read satisfied");
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return (0);
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}
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return (ENOENT);
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}
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/*
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* This function ensures that, when doing a decrypting read of a block,
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@ -1297,8 +1401,11 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
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dnode_t *dn;
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zbookmark_phys_t zb;
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uint32_t aflags = ARC_FLAG_NOWAIT;
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int err, zio_flags = 0;
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int err, zio_flags;
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boolean_t bonus_read;
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err = zio_flags = 0;
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bonus_read = B_FALSE;
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DB_DNODE_ENTER(db);
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dn = DB_DNODE(db);
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ASSERT(!zfs_refcount_is_zero(&db->db_holds));
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@ -1309,76 +1416,13 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
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RW_LOCK_HELD(&db->db_parent->db_rwlock));
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if (db->db_blkid == DMU_BONUS_BLKID) {
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/*
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* The bonus length stored in the dnode may be less than
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* the maximum available space in the bonus buffer.
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*/
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int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen);
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int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
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/* if the underlying dnode block is encrypted, decrypt it */
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err = dbuf_read_verify_dnode_crypt(db, flags);
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if (err != 0) {
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DB_DNODE_EXIT(db);
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (err);
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}
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ASSERT3U(bonuslen, <=, db->db.db_size);
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db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
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arc_space_consume(max_bonuslen, ARC_SPACE_BONUS);
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if (bonuslen < max_bonuslen)
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bzero(db->db.db_data, max_bonuslen);
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if (bonuslen)
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bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen);
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DB_DNODE_EXIT(db);
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db->db_state = DB_CACHED;
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (0);
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err = dbuf_read_bonus(db, dn, flags);
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goto early_unlock;
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}
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/*
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* Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync()
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* processes the delete record and clears the bp while we are waiting
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* for the dn_mtx (resulting in a "no" from block_freed).
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*/
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if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) ||
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(db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) ||
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BP_IS_HOLE(db->db_blkptr)))) {
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arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
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dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, db, type,
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db->db.db_size));
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bzero(db->db.db_data, db->db.db_size);
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if (db->db_blkptr != NULL && db->db_level > 0 &&
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BP_IS_HOLE(db->db_blkptr) &&
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db->db_blkptr->blk_birth != 0) {
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blkptr_t *bps = db->db.db_data;
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for (int i = 0; i < ((1 <<
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DB_DNODE(db)->dn_indblkshift) / sizeof (blkptr_t));
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i++) {
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blkptr_t *bp = &bps[i];
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ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==,
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1 << dn->dn_indblkshift);
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BP_SET_LSIZE(bp,
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BP_GET_LEVEL(db->db_blkptr) == 1 ?
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dn->dn_datablksz :
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BP_GET_LSIZE(db->db_blkptr));
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BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr));
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BP_SET_LEVEL(bp,
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BP_GET_LEVEL(db->db_blkptr) - 1);
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BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0);
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}
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}
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DB_DNODE_EXIT(db);
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db->db_state = DB_CACHED;
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (0);
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}
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err = dbuf_read_hole(db, dn, flags);
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if (err == 0)
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goto early_unlock;
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/*
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* Any attempt to read a redacted block should result in an error. This
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@ -1389,13 +1433,10 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
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ASSERT(dsl_dataset_feature_is_active(
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db->db_objset->os_dsl_dataset,
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SPA_FEATURE_REDACTED_DATASETS));
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DB_DNODE_EXIT(db);
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (SET_ERROR(EIO));
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err = SET_ERROR(EIO);
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goto early_unlock;
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}
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SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
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db->db.db_object, db->db_level, db->db_blkid);
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@ -1407,23 +1448,18 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
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spa_log_error(db->db_objset->os_spa, &zb);
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zfs_panic_recover("unencrypted block in encrypted "
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"object set %llu", dmu_objset_id(db->db_objset));
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DB_DNODE_EXIT(db);
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (SET_ERROR(EIO));
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err = SET_ERROR(EIO);
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goto early_unlock;
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}
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err = dbuf_read_verify_dnode_crypt(db, flags);
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if (err != 0) {
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DB_DNODE_EXIT(db);
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (err);
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}
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if (err != 0)
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goto early_unlock;
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DB_DNODE_EXIT(db);
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db->db_state = DB_READ;
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DTRACE_SET_STATE(db, "read issued");
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mutex_exit(&db->db_mtx);
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if (DBUF_IS_L2CACHEABLE(db))
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@ -1449,6 +1485,11 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
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dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, zio_flags,
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&aflags, &zb);
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return (err);
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early_unlock:
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DB_DNODE_EXIT(db);
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mutex_exit(&db->db_mtx);
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dmu_buf_unlock_parent(db, dblt, tag);
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return (err);
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}
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/*
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|
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@ -1668,13 +1709,11 @@ dbuf_noread(dmu_buf_impl_t *db)
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while (db->db_state == DB_READ || db->db_state == DB_FILL)
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cv_wait(&db->db_changed, &db->db_mtx);
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if (db->db_state == DB_UNCACHED) {
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arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
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spa_t *spa = db->db_objset->os_spa;
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ASSERT(db->db_buf == NULL);
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ASSERT(db->db.db_data == NULL);
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dbuf_set_data(db, arc_alloc_buf(spa, db, type, db->db.db_size));
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dbuf_set_data(db, dbuf_alloc_arcbuf(db));
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db->db_state = DB_FILL;
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DTRACE_SET_STATE(db, "assigning filled buffer");
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} else if (db->db_state == DB_NOFILL) {
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dbuf_clear_data(db);
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} else {
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@ -2391,7 +2430,7 @@ dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx)
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dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
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db->db_state = DB_NOFILL;
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DTRACE_SET_STATE(db, "allocating NOFILL buffer");
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dmu_buf_will_fill(db_fake, tx);
|
||||
}
|
||||
|
||||
|
|
@ -2467,18 +2506,24 @@ void
|
|||
dmu_buf_fill_done(dmu_buf_t *dbuf, dmu_tx_t *tx)
|
||||
{
|
||||
dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf;
|
||||
dbuf_states_t old_state;
|
||||
mutex_enter(&db->db_mtx);
|
||||
DBUF_VERIFY(db);
|
||||
|
||||
if (db->db_state == DB_FILL) {
|
||||
old_state = db->db_state;
|
||||
db->db_state = DB_CACHED;
|
||||
if (old_state == DB_FILL) {
|
||||
if (db->db_level == 0 && db->db_freed_in_flight) {
|
||||
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
||||
/* we were freed while filling */
|
||||
/* XXX dbuf_undirty? */
|
||||
bzero(db->db.db_data, db->db.db_size);
|
||||
db->db_freed_in_flight = FALSE;
|
||||
DTRACE_SET_STATE(db,
|
||||
"fill done handling freed in flight");
|
||||
} else {
|
||||
DTRACE_SET_STATE(db, "fill done");
|
||||
}
|
||||
db->db_state = DB_CACHED;
|
||||
cv_broadcast(&db->db_changed);
|
||||
}
|
||||
mutex_exit(&db->db_mtx);
|
||||
|
|
@ -2614,6 +2659,7 @@ dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx)
|
|||
ASSERT(db->db_buf == NULL);
|
||||
dbuf_set_data(db, buf);
|
||||
db->db_state = DB_FILL;
|
||||
DTRACE_SET_STATE(db, "filling assigned arcbuf");
|
||||
mutex_exit(&db->db_mtx);
|
||||
(void) dbuf_dirty(db, tx);
|
||||
dmu_buf_fill_done(&db->db, tx);
|
||||
|
|
@ -2641,6 +2687,7 @@ dbuf_destroy(dmu_buf_impl_t *db)
|
|||
kmem_free(db->db.db_data, bonuslen);
|
||||
arc_space_return(bonuslen, ARC_SPACE_BONUS);
|
||||
db->db_state = DB_UNCACHED;
|
||||
DTRACE_SET_STATE(db, "buffer cleared");
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -2670,6 +2717,7 @@ dbuf_destroy(dmu_buf_impl_t *db)
|
|||
ASSERT(db->db_data_pending == NULL);
|
||||
|
||||
db->db_state = DB_EVICTING;
|
||||
DTRACE_SET_STATE(db, "buffer eviction started");
|
||||
db->db_blkptr = NULL;
|
||||
|
||||
/*
|
||||
|
|
@ -2867,6 +2915,7 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
|
|||
ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen);
|
||||
db->db.db_offset = DMU_BONUS_BLKID;
|
||||
db->db_state = DB_UNCACHED;
|
||||
DTRACE_SET_STATE(db, "bonus buffer created");
|
||||
db->db_caching_status = DB_NO_CACHE;
|
||||
/* the bonus dbuf is not placed in the hash table */
|
||||
arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
|
||||
|
|
@ -2890,7 +2939,7 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
|
|||
* dn_dbufs list.
|
||||
*/
|
||||
mutex_enter(&dn->dn_dbufs_mtx);
|
||||
db->db_state = DB_EVICTING;
|
||||
db->db_state = DB_EVICTING; /* not worth logging this state change */
|
||||
if ((odb = dbuf_hash_insert(db)) != NULL) {
|
||||
/* someone else inserted it first */
|
||||
kmem_cache_free(dbuf_kmem_cache, db);
|
||||
|
|
@ -2901,6 +2950,7 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
|
|||
avl_add(&dn->dn_dbufs, db);
|
||||
|
||||
db->db_state = DB_UNCACHED;
|
||||
DTRACE_SET_STATE(db, "regular buffer created");
|
||||
db->db_caching_status = DB_NO_CACHE;
|
||||
mutex_exit(&dn->dn_dbufs_mtx);
|
||||
arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
|
||||
|
|
|
|||
Loading…
Reference in New Issue