Micro-optimize dsl_prop_get_dd()
Use the saved property index instead of looking it up once per DSL directory when traversing up towards the root. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Igor Kozhukhov <igor@dilos.org> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Akash B <akash-b@hpe.com> Signed-off-by: Mark Johnston <markj@FreeBSD.org> Sponsored-by: The FreeBSD Foundation Closes #14397
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@ -123,7 +123,7 @@ dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
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/* Check for a iuv value. */
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err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
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iuvstr, intsz, numints, buf);
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if (err == 0 && dsl_prop_known_index(zfs_name_to_prop(propname),
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if (err == 0 && dsl_prop_known_index(prop,
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*(uint64_t *)buf) != 1)
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err = ENOENT;
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if (err != ENOENT) {
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