[PATCH] mdadm: fix reshape from RAID5 to RAID6 with backup file
From: Nigel Croxon <hidden>
Date: 2021-01-20 20:08:44
Subsystem:
the rest · Maintainer:
Linus Torvalds
Reshaping a 3-disk RAID5 to 4-disk RAID6 will cause a hang of the resync after the grow. Adding a spare disk to avoid degrading the array when growing is successful, but not successful when supplying a backup file on the command line. If the reshape job is not already running, set the sync_max value to max. Signed-off-by: Nigel Croxon <redacted> --- Grow.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/Grow.c b/Grow.c
index 6b8321c..5c2512f 100644
--- a/Grow.c
+++ b/Grow.c@@ -931,12 +931,15 @@ int start_reshape(struct mdinfo *sra, int already_running, err = err ?: sysfs_set_num(sra, NULL, "sync_max", sync_max_to_set); if (!already_running && err == 0) { int cnt = 5; + int err2; do { err = sysfs_set_str(sra, NULL, "sync_action", "reshape"); - if (err) + err2 = sysfs_set_str(sra, NULL, "sync_max", + "max"); + if (err || err2) sleep(1); - } while (err && errno == EBUSY && cnt-- > 0); + } while (err && err2 && errno == EBUSY && cnt-- > 0); } return err; }
--
2.20.1