[PATCH] Expose spa_ashift_inflation

[Xin Li]

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Hi,

This is a trivial patch, tested against -CURRENT.  Or, is this
intentionally hidden?  (I think we still want to expose it somewhere
as we don't have mdb equivalent to provide access).

If there is no objections by Friday I'll commit this change against -HEAD.

Cheers,
- -- 
Xin LI <delphij at delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c
===================================================================
--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c	(revision 258941)
+++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c	(working copy)
@@ -302,6 +302,9 @@ SYSCTL_INT(_vfs_zfs, OID_AUTO, deadman_enabled, CT
  *     (VDEV_RAIDZ_MAXPARITY + 1) * SPA_DVAS_PER_BP * 2 == 24
  */
 int spa_asize_inflation = 24;
+TUNABLE_INT("vfs.zfs.spa_asize_inflation", &spa_asize_inflation);
+SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_asize_inflation, CTLFLAG_RWTUN,
+    &spa_asize_inflation, 0, "Worst case inflation factor for single sector writes");
 
 #ifndef illumos
 #ifdef _KERNEL