Make spa_history_zone platform-dependent in kernel

This function should only return "linux" on Linux.

Move the kernel part of the function out of common code.
Fix the tests for FreeBSD.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10079

include/sys/spa_impl.h

@@ -447,6 +447,7 @@ extern void spa_event_post(sysevent_t *ev);
 extern int param_set_deadman_failmode_common(const char *val);
 extern void spa_set_deadman_synctime(hrtime_t ns);
 extern void spa_set_deadman_ziotime(hrtime_t ns);
+extern const char *spa_history_zone(void);
 
 #ifdef	__cplusplus
 }

module/os/linux/zfs/spa_misc_os.c

@@ -102,3 +102,9 @@ param_set_slop_shift(const char *buf, zfs_kernel_param_t *kp)
 
 	return (0);
 }
+
+const char *
+spa_history_zone(void)
+{
+	return ("linux");
+}

module/zfs/spa_history.c

@@ -180,16 +180,6 @@ spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
 	return (0);
 }
 
-static char *
-spa_history_zone(void)
-{
-#ifdef _KERNEL
-	return ("linux");
-#else
-	return (NULL);
-#endif
-}
-
 /*
  * Post a history sysevent.
  *
@@ -622,6 +612,14 @@ spa_history_log_version(spa_t *spa, const char *operation, dmu_tx_t *tx)
 	    u->nodename, u->release, u->version, u->machine);
 }
 
+#ifndef _KERNEL
+const char *
+spa_history_zone(void)
+{
+	return (NULL);
+}
+#endif
+
 #if defined(_KERNEL)
 EXPORT_SYMBOL(spa_history_create_obj);
 EXPORT_SYMBOL(spa_history_get);

tests/zfs-tests/tests/functional/history/history_common.kshlib

@@ -51,11 +51,11 @@ function run_and_verify
 	fullcmd="$1"
 	flags="$2"
 
-	if is_linux; then
+	if is_illumos; then
+		histcmd=$(echo $fullcmd | sed 's/\/usr\/sbin\///g')
+	else
 		histcmd=$(echo $fullcmd | sed 's/^.*\/\(zpool .*\).*$/\1/')
 		histcmd=$(echo $histcmd | sed 's/^.*\/\(zfs .*\).*$/\1/')
-	else
-		histcmd=$(echo $fullcmd | sed 's/\/usr\/sbin\///g')
 	fi
 
 	cmd=$(echo $histcmd | awk '{print $1}')
@@ -112,10 +112,11 @@ function verify_long
 	typeset suffix=""
 	if is_linux; then
 		suffix=":linux"
+	elif is_freebsd; then
+		suffix=":freebsd"
 	fi
 
-	grep "$cmd \[user $uid ($user) on $hname$suffix\]" \
-	    $NEW_HISTORY >/dev/null 2>&1
+	grep -q "$cmd \[user $uid ($user) on $hname$suffix\]" $NEW_HISTORY
 	if [[ $? != 0 ]]; then
 		log_note "Couldn't find long information for \"$cmd\""
 		return 1