Author: mav
Date: Sat Oct 29 08:55:13 2016
New Revision: 308084
URL: https://svnweb.freebsd.org/changeset/base/308084
Log:
MFC r306425: MFV r306423:
7402 Create tunable to ignore hole_birth feature
Until we can resolve the numerous hole_birth bugs that have cropped up
recently, and come up with a way going forwards to protect users from
corruption, we should disable the hole_birth feature. Using a tunable
allows those who are confident that their data is correct to continue to
take advantage of the feature.
Closes #188
Reviewed by: Matthew Ahrens <mahr...@delphix.com>
Author: Paul Dagnelie <p...@delphix.com>
Modified:
stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_traverse.c
Directory Properties:
stable/11/ (props changed)
Modified:
stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_traverse.c
==============================================================================
--- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_traverse.c
Sat Oct 29 08:54:18 2016 (r308083)
+++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_traverse.c
Sat Oct 29 08:55:13 2016 (r308084)
@@ -40,6 +40,11 @@
#include <sys/zfeature.h>
int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
+boolean_t send_holes_without_birth_time = B_TRUE;
+
+SYSCTL_DECL(_vfs_zfs);
+SYSCTL_UINT(_vfs_zfs, OID_AUTO, send_holes_without_birth_time, CTLFLAG_RWTUN,
+ &send_holes_without_birth_time, 0, "Send holes without birth time");
typedef struct prefetch_data {
kmutex_t pd_mtx;
@@ -254,7 +259,8 @@ traverse_visitbp(traverse_data_t *td, co
*
* Note that the meta-dnode cannot be reallocated.
*/
- if ((!td->td_realloc_possible ||
+ if (!send_holes_without_birth_time &&
+ (!td->td_realloc_possible ||
zb->zb_object == DMU_META_DNODE_OBJECT) &&
td->td_hole_birth_enabled_txg <= td->td_min_txg)
return (0);
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