Author: mav
Date: Mon Jun 3 19:53:39 2019
New Revision: 348576
URL: https://svnweb.freebsd.org/changeset/base/348576
Log:
9963 Seperate tunable for disabling ZIL vdev flush
illumos/illumos-gate@f8fdf6812567ce1a3b76a6bee2ee3f04bd3fcaca
Reviewed by: Matt Ahrens <m...@delphix.com>
Reviewed by: Brad Lewis <brad.le...@delphix.com>
Reviewed by: Patrick Mooney <patrick.moo...@joyent.com>
Approved by: Dan McDonald <dan...@joyent.com>
Author: Prakash Surya <prakash.su...@delphix.com>
Modified:
vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_disk.c
vendor-sys/illumos/dist/uts/common/fs/zfs/zil.c
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_disk.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_disk.c Mon Jun 3
19:37:14 2019 (r348575)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_disk.c Mon Jun 3
19:53:39 2019 (r348576)
@@ -38,6 +38,13 @@
#include <sys/fm/fs/zfs.h>
/*
+ * Tunable parameter for debugging or performance analysis. Setting this
+ * will cause pool corruption on power loss if a volatile out-of-order
+ * write cache is enabled.
+ */
+boolean_t zfs_nocacheflush = B_FALSE;
+
+/*
* Virtual device vector for disks.
*/
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zil.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/zil.c Mon Jun 3 19:37:14
2019 (r348575)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/zil.c Mon Jun 3 19:53:39
2019 (r348576)
@@ -95,11 +95,12 @@ int zfs_commit_timeout_pct = 5;
int zil_replay_disable = 0;
/*
- * Tunable parameter for debugging or performance analysis. Setting
- * zfs_nocacheflush will cause corruption on power loss if a volatile
- * out-of-order write cache is enabled.
+ * Disable the DKIOCFLUSHWRITECACHE commands that are normally sent to
+ * the disk(s) by the ZIL after an LWB write has completed. Setting this
+ * will cause ZIL corruption on power loss if a volatile out-of-order
+ * write cache is enabled.
*/
-boolean_t zfs_nocacheflush = B_FALSE;
+boolean_t zil_nocacheflush = B_FALSE;
/*
* Limit SLOG write size per commit executed with synchronous priority.
@@ -991,7 +992,7 @@ zil_lwb_add_block(lwb_t *lwb, const blkptr_t *bp)
int ndvas = BP_GET_NDVAS(bp);
int i;
- if (zfs_nocacheflush)
+ if (zil_nocacheflush)
return;
mutex_enter(&lwb->lwb_vdev_lock);
@@ -1015,7 +1016,7 @@ zil_lwb_add_txg(lwb_t *lwb, uint64_t txg)
/*
* This function is a called after all VDEVs associated with a given lwb
* write have completed their DKIOCFLUSHWRITECACHE command; or as soon
- * as the lwb write completes, if "zfs_nocacheflush" is set.
+ * as the lwb write completes, if "zil_nocacheflush" is set.
*
* The intention is for this function to be called as soon as the
* contents of an lwb are considered "stable" on disk, and will survive
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