OpenZFS 8070 - Add some ZFS comments
Authored by: Alan Somers <asomers@gmail.com> Reviewed by: Yuri Pankov <yuri.pankov@gmail.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Robert Mustacchi <rm@joyent.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Ported-by: bunder2015 <omfgbunder@gmail.com> OpenZFS-issue: https://www.illumos.org/issues/8070 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/40713f2 Closes #6160
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@ -1300,6 +1300,11 @@ dbuf_unoverride(dbuf_dirty_record_t *dr)
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uint64_t txg = dr->dr_txg;
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ASSERT(MUTEX_HELD(&db->db_mtx));
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/*
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* This assert is valid because dmu_sync() expects to be called by
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* a zilog's get_data while holding a range lock. This call only
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* comes from dbuf_dirty() callers who must also hold a range lock.
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*/
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ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC);
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ASSERT(db->db_level == 0);
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@ -1511,6 +1511,7 @@ dsl_scan_active(dsl_scan_t *scn)
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return (used != 0);
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}
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/* Called whenever a txg syncs. */
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void
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dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
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{
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@ -1956,6 +1957,7 @@ dsl_scan_scrub_cb(dsl_pool_t *dp,
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return (0);
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}
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/* Called by the ZFS_IOC_POOL_SCAN ioctl to start a scrub or resilver */
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int
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dsl_scan(dsl_pool_t *dp, pool_scan_func_t func)
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{
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