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Add tunable to ignore hole_birth

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Adds a module option which disables the hole_birth optimization
which has been responsible for several recent bugs, including
issue #4050.

Original-patch: https://gist.github.com/pcd1193182/2c0cd47211f3aee623958b4698836c48
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4833
This commit is contained in:
Rich Ercolani 2016-07-08 16:51:50 -04:00 committed by Brian Behlendorf
parent e35c5a8265
commit 6d836e6f8b
2 changed files with 18 additions and 1 deletions
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13
man/man5/zfs-module-parameters.5
View File

@ -24,6 +24,19 @@ Description of the different parameters to the ZFS module.
.sp
.LP
.sp
.ne 2
.na
\fBignore_hole_birth\fR (int)
.ad
.RS 12n
When set, the hole_birth optimization will not be used, and all holes will
always be sent on zfs send. Useful if you suspect your datasets are affected
by a bug in hole_birth.
.sp
Use \fB1\fR for on and \fB0\fR (default) for off.
.RE
.sp
.ne 2
.na

6
module/zfs/dmu_traverse.c
View File

@ -39,6 +39,7 @@
#include <sys/zfeature.h>
int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */
int32_t ignore_hole_birth = 0;
typedef struct prefetch_data {
kmutex_t pd_mtx;
@ -251,7 +252,7 @@ traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
*
* Note that the meta-dnode cannot be reallocated.
*/
if ((!td->td_realloc_possible ||
if (!ignore_hole_birth && (!td->td_realloc_possible ||
zb->zb_object == DMU_META_DNODE_OBJECT) &&
td->td_hole_birth_enabled_txg <= td->td_min_txg)
return (0);
@ -727,4 +728,7 @@ EXPORT_SYMBOL(traverse_pool);
module_param(zfs_pd_bytes_max, int, 0644);
MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
module_param(ignore_hole_birth, int, 0644);
MODULE_PARM_DESC(ignore_hole_birth, "Ignore hole_birth txg for send");
#endif