Teach zpool scrub to scrub only blocks in error log

Added a flag '-e' in zpool scrub to scrub only blocks in error log. A
user can pause, resume and cancel the error scrub by passing additional
command line arguments -p -s just like a regular scrub. This involves
adding a new flag, creating new libzfs interfaces, a new ioctl, and the
actual iteration and read-issuing logic. Error scrubbing is executed in
multiple txg to make sure pool performance is not affected.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Tony Hutter <[email protected]>
Co-authored-by: TulsiJain [email protected]
Signed-off-by: George Amanakis <[email protected]>
Closes #8995
Closes #12355

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/zfs-tests/include/libtest.shlib b/tests/zfs-tests/include/libtest.shlib
index 8521f271b..133f8387d 100644
--- a/tests/zfs-tests/include/libtest.shlib
+++ b/tests/zfs-tests/include/libtest.shlib
@@ -1969,6 +1969,12 @@ function is_pool_scrubbing #pool <verbose>
 	check_pool_status "$1" "scan" "scrub in progress since " $2
 }
 
+function is_pool_error_scrubbing #pool <verbose>
+{
+	check_pool_status "$1" "scrub" "error scrub in progress since " $2
+	return $?
+}
+
 function is_pool_scrubbed #pool <verbose>
 {
 	check_pool_status "$1" "scan" "scrub repaired" $2
@@ -1979,11 +1985,23 @@ function is_pool_scrub_stopped #pool <verbose>
 	check_pool_status "$1" "scan" "scrub canceled" $2
 }
 
+function is_pool_error_scrub_stopped #pool <verbose>
+{
+	check_pool_status "$1" "scrub" "error scrub canceled on " $2
+	return $?
+}
+
 function is_pool_scrub_paused #pool <verbose>
 {
 	check_pool_status "$1" "scan" "scrub paused since " $2
 }
 
+function is_pool_error_scrub_paused #pool <verbose>
+{
+	check_pool_status "$1" "scrub" "error scrub paused since " $2
+	return $?
+}
+
 function is_pool_removing #pool
 {
 	check_pool_status "$1" "remove" "in progress since "