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From fdd015696c2e2a6b234a92af564aea44b62e6a0d Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Mon, 27 Mar 2017 14:36:56 +1100
Subject: [RHEL7.5 PATCH 022/169] Introduce sys_hot_remove_disk()
The new hot_remove_disk() will retry HOT_REMOVE_DISK
several times in the face of EBUSY.
However we sometimes remove a device by writing "remove" to the
"state" attributed. This should be retried as well.
So introduce sys_hot_remove_disk() to repeat this action a few times.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@gmail.com>
---
Manage.c | 6 +-----
mdadm.h | 1 +
util.c | 12 ++++++++++++
3 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/Manage.c b/Manage.c
index 9139f96..edf5798 100644
--- a/Manage.c
+++ b/Manage.c
@@ -1177,11 +1177,7 @@ int Manage_remove(struct supertype *tst, int fd, struct mddev_dev *dv,
/* device has been removed and we don't know
* the major:minor number
*/
- int n = write(sysfd, "remove", 6);
- if (n != 6)
- err = -1;
- else
- err = 0;
+ err = sys_hot_remove_disk(sysfd);
} else {
err = hot_remove_disk(fd, rdev);
if (err && errno == ENODEV) {
diff --git a/mdadm.h b/mdadm.h
index 5bcfb86..b855d24 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1477,6 +1477,7 @@ extern int add_disk(int mdfd, struct supertype *st,
extern int remove_disk(int mdfd, struct supertype *st,
struct mdinfo *sra, struct mdinfo *info);
extern int hot_remove_disk(int mdfd, unsigned long dev);
+extern int sys_hot_remove_disk(int statefd);
extern int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info);
unsigned long long min_recovery_start(struct mdinfo *array);
diff --git a/util.c b/util.c
index d09a7e2..b718531 100644
--- a/util.c
+++ b/util.c
@@ -1813,6 +1813,18 @@ int hot_remove_disk(int mdfd, unsigned long dev)
return ret;
}
+int sys_hot_remove_disk(int statefd)
+{
+ int cnt = 5;
+ int ret;
+
+ while ((ret = write(statefd, "remove", 6)) == -1 &&
+ errno == EBUSY &&
+ cnt-- > 0)
+ usleep(10000);
+ return ret == 6 ? 0 : -1;
+}
+
int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
{
/* Initialise kernel's knowledge of array.
--
2.7.4