Author: mav
Date: Wed Jan 30 17:24:50 2019
New Revision: 343585
URL: https://svnweb.freebsd.org/changeset/base/343585
Log:
Only sort requests of types that have concept of offset.
Other types, such as BIO_FLUSH or BIO_ZONE, or especially new/unknown ones,
may imply some degree of ordering even if strict ordering is not requested
explicitly.
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
Modified:
head/sys/kern/subr_disk.c
Modified: head/sys/kern/subr_disk.c
==============================================================================
--- head/sys/kern/subr_disk.c Wed Jan 30 17:11:08 2019 (r343584)
+++ head/sys/kern/subr_disk.c Wed Jan 30 17:24:50 2019 (r343585)
@@ -259,6 +259,17 @@ bioq_disksort(struct bio_queue_head *head, struct bio
return;
}
+ /*
+ * We should only sort requests of types that have concept of offset.
+ * Other types, such as BIO_FLUSH or BIO_ZONE, may imply some degree
+ * of ordering even if strict ordering is not requested explicitly.
+ */
+ if (bp->bio_cmd != BIO_READ && bp->bio_cmd != BIO_WRITE &&
+ bp->bio_cmd != BIO_DELETE) {
+ bioq_insert_tail(head, bp);
+ return;
+ }
+
if (bioq_batchsize > 0 && head->batched > bioq_batchsize) {
bioq_insert_tail(head, bp);
return;
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