From: Adam Kwolek <adam.kwolek@intel.com>
Date: Thu, 9 Jun 2011 03:00:56 +0000 (+1000)
Subject: imsm: Optimize expansion speed when no backup is required
X-Git-Tag: mdadm-3.2.2~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8016a6d42ecef8bff5b6f9d0020ae549e4324188;p=thirdparty%2Fmdadm.git

imsm: Optimize expansion speed when no backup is required

When no reshape backup is required (e.g. OLCE after critical section),
check-pointing can use bigger steps than backup space allows for.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/super-intel.c b/super-intel.c
index 292584b1..5c840ec3 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -8854,11 +8854,19 @@ static int imsm_manage_reshape(
 					"migration record (UNIT_SRC_IN_CP_AREA)\n");
 				goto abort;
 			}
+		} else {
+			/* set next step to use whole border area */
+			border /= next_step;
+			if (border > 1)
+				next_step *= border;
 		}
 		/* When data backed up, checkpoint stored,
 		 * kick the kernel to reshape unit of data
 		 */
 		next_step = next_step + sra->reshape_progress;
+		/* limit next step to array max position */
+		if (next_step > max_position)
+			next_step = max_position;
 		sysfs_set_num(sra, NULL, "suspend_lo", sra->reshape_progress);
 		sysfs_set_num(sra, NULL, "suspend_hi", next_step);
 		sra->reshape_progress = next_step;