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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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module/zfs/dmu_traverse.c
+5 -1
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@@ -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