In rare circumstances, the short period that *hot_remove_disk()
waits isn't long enough to IO to complete. This particularly happens
when a device is failing and many retries are still happening.
We don't want to increase the normal wait time for "mdadm --remove"
as that might be use just to test if a device is active or not, and a
delay would be problematic.
So allow "--force" to mean that mdadm should try extra hard for a
--remove to complete, waiting up to 5 seconds.
Note that this patch fixes a comment which claim the previous
wait time was half a second, where it was really 50msec.
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
---
Grow.c | 2 +-
Manage.c | 10 +++++-----
mdadm.h | 4 ++--
util.c | 10 +++++-----
4 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/Grow.c b/Grow.c
index 218a70649c1f..e22661ca3dff 100755
--- a/Grow.c
+++ b/Grow.c
@@ -2749,7 +2749,7 @@ static int impose_level(int fd, int level, char *devname, int verbose)
continue;
ioctl(fd, SET_DISK_FAULTY,
makedev(disk.major, disk.minor));
- hot_remove_disk(fd, makedev(disk.major, disk.minor));
+ hot_remove_disk(fd, makedev(disk.major, disk.minor), 1);
}
}
c = map_num(pers, level);
diff --git a/Manage.c b/Manage.c
index edf5798aa87d..55218d9b0a7d 100644
--- a/Manage.c
+++ b/Manage.c
@@ -1110,7 +1110,7 @@ int Manage_add(int fd, int tfd, struct mddev_dev *dv,
}
int Manage_remove(struct supertype *tst, int fd, struct mddev_dev *dv,
- int sysfd, unsigned long rdev, int verbose, char *devname)
+ int sysfd, unsigned long rdev, int force, int verbose, char *devname)
{
int lfd = -1;
int err;
@@ -1177,9 +1177,9 @@ 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
*/
- err = sys_hot_remove_disk(sysfd);
+ err = sys_hot_remove_disk(sysfd, force);
} else {
- err = hot_remove_disk(fd, rdev);
+ err = hot_remove_disk(fd, rdev, force);
if (err && errno == ENODEV) {
/* Old kernels rejected this if no personality
* is registered */
@@ -1603,7 +1603,7 @@ int Manage_subdevs(char *devname, int fd,
if (dv->disposition == 'F')
/* Need to remove first */
- hot_remove_disk(fd, rdev);
+ hot_remove_disk(fd, rdev, force);
/* Make sure it isn't in use (in 2.6 or later) */
tfd = dev_open(dv->devname, O_RDONLY|O_EXCL);
if (tfd >= 0) {
@@ -1645,7 +1645,7 @@ int Manage_subdevs(char *devname, int fd,
rv = -1;
} else
rv = Manage_remove(tst, fd, dv, sysfd,
- rdev, verbose,
+ rdev, verbose, force,
devname);
if (sysfd >= 0)
close(sysfd);
diff --git a/mdadm.h b/mdadm.h
index 52952a800ace..3b3d24230a79 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1476,8 +1476,8 @@ extern int add_disk(int mdfd, struct supertype *st,
struct mdinfo *sra, struct mdinfo *info);
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 hot_remove_disk(int mdfd, unsigned long dev, int force);
+extern int sys_hot_remove_disk(int statefd, int force);
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 43fd83e72ded..6fd582520f0d 100644
--- a/util.c
+++ b/util.c
@@ -1795,15 +1795,15 @@ int remove_disk(int mdfd, struct supertype *st,
return rv;
}
-int hot_remove_disk(int mdfd, unsigned long dev)
+int hot_remove_disk(int mdfd, unsigned long dev, int force)
{
- int cnt = 5;
+ int cnt = force ? 500 : 5;
int ret;
/* HOT_REMOVE_DISK can fail with EBUSY if there are
* outstanding IO requests to the device.
* In this case, it can be helpful to wait a little while,
- * up to half a second, for that IO to flush.
+ * up to 5 seconds if 'force' is set, or 50 msec if not.
*/
while ((ret = ioctl(mdfd, HOT_REMOVE_DISK, dev)) == -1 &&
errno == EBUSY &&
@@ -1813,9 +1813,9 @@ int hot_remove_disk(int mdfd, unsigned long dev)
return ret;
}
-int sys_hot_remove_disk(int statefd)
+int sys_hot_remove_disk(int statefd, int force)
{
- int cnt = 5;
+ int cnt = force ? 500 : 5;
int ret;
while ((ret = write(statefd, "remove", 6)) == -1 &&
--
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